tor.1.txt 149 KB

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  1. // Copyright (c) The Tor Project, Inc.
  2. // See LICENSE for licensing information
  3. // This is an asciidoc file used to generate the manpage/html reference.
  4. // Learn asciidoc on http://www.methods.co.nz/asciidoc/userguide.html
  5. :man source: Tor
  6. :man manual: Tor Manual
  7. TOR(1)
  8. ======
  9. NAME
  10. ----
  11. tor - The second-generation onion router
  12. SYNOPSIS
  13. --------
  14. **tor** [__OPTION__ __value__]...
  15. DESCRIPTION
  16. -----------
  17. Tor is a connection-oriented anonymizing communication
  18. service. Users choose a source-routed path through a set of nodes, and
  19. negotiate a "virtual circuit" through the network, in which each node
  20. knows its predecessor and successor, but no others. Traffic flowing down
  21. the circuit is unwrapped by a symmetric key at each node, which reveals
  22. the downstream node. +
  23. Basically, Tor provides a distributed network of servers or relays ("onion routers").
  24. Users bounce their TCP streams -- web traffic, ftp, ssh, etc. -- around the
  25. network, and recipients, observers, and even the relays themselves have
  26. difficulty tracking the source of the stream.
  27. By default, **tor** will act as a client only. To help the network
  28. by providing bandwidth as a relay, change the **ORPort** configuration
  29. option -- see below. Please also consult the documentation on the Tor
  30. Project's website.
  31. COMMAND-LINE OPTIONS
  32. --------------------
  33. [[opt-h]] **-h**, **-help**::
  34. Display a short help message and exit.
  35. [[opt-f]] **-f** __FILE__::
  36. Specify a new configuration file to contain further Tor configuration
  37. options OR pass *-* to make Tor read its configuration from standard
  38. input. (Default: @CONFDIR@/torrc, or $HOME/.torrc if that file is not
  39. found)
  40. [[opt-allow-missing-torrc]] **--allow-missing-torrc**::
  41. Do not require that configuration file specified by **-f** exist if
  42. default torrc can be accessed.
  43. [[opt-defaults-torrc]] **--defaults-torrc** __FILE__::
  44. Specify a file in which to find default values for Tor options. The
  45. contents of this file are overridden by those in the regular
  46. configuration file, and by those on the command line. (Default:
  47. @CONFDIR@/torrc-defaults.)
  48. [[opt-ignore-missing-torrc]] **--ignore-missing-torrc**::
  49. Specifies that Tor should treat a missing torrc file as though it
  50. were empty. Ordinarily, Tor does this for missing default torrc files,
  51. but not for those specified on the command line.
  52. [[opt-hash-password]] **--hash-password** __PASSWORD__::
  53. Generates a hashed password for control port access.
  54. [[opt-list-fingerprint]] **--list-fingerprint**::
  55. Generate your keys and output your nickname and fingerprint.
  56. [[opt-verify-config]] **--verify-config**::
  57. Verify the configuration file is valid.
  58. [[opt-serviceinstall]] **--service install** [**--options** __command-line options__]::
  59. Install an instance of Tor as a Windows service, with the provided
  60. command-line options. Current instructions can be found at
  61. https://www.torproject.org/docs/faq#NTService
  62. [[opt-service]] **--service** **remove**|**start**|**stop**::
  63. Remove, start, or stop a configured Tor Windows service.
  64. [[opt-nt-service]] **--nt-service**::
  65. Used internally to implement a Windows service.
  66. [[opt-list-torrc-options]] **--list-torrc-options**::
  67. List all valid options.
  68. [[opt-version]] **--version**::
  69. Display Tor version and exit.
  70. [[opt-quiet]] **--quiet**|**--hush**::
  71. Override the default console log. By default, Tor starts out logging
  72. messages at level "notice" and higher to the console. It stops doing so
  73. after it parses its configuration, if the configuration tells it to log
  74. anywhere else. You can override this behavior with the **--hush** option,
  75. which tells Tor to only send warnings and errors to the console, or with
  76. the **--quiet** option, which tells Tor not to log to the console at all.
  77. [[opt-keygen]] **--keygen** [**--newpass**]::
  78. Running "tor --keygen" creates a new ed25519 master identity key for a
  79. relay, or only a fresh temporary signing key and certificate, if you
  80. already have a master key. Optionally you can encrypt the master identity
  81. key with a passphrase: Tor will ask you for one. If you don't want to
  82. encrypt the master key, just don't enter any passphrase when asked. +
  83. +
  84. The **--newpass** option should be used with --keygen only when you need
  85. to add, change, or remove a passphrase on an existing ed25519 master
  86. identity key. You will be prompted for the old passphase (if any),
  87. and the new passphrase (if any). +
  88. +
  89. When generating a master key, you will probably want to use
  90. **--DataDirectory** to control where the keys
  91. and certificates will be stored, and **--SigningKeyLifetime** to
  92. control their lifetimes. Their behavior is as documented in the
  93. server options section below. (You must have write access to the specified
  94. DataDirectory.) +
  95. +
  96. To use the generated files, you must copy them to the DataDirectory/keys
  97. directory of your Tor daemon, and make sure that they are owned by the
  98. user actually running the Tor daemon on your system.
  99. Other options can be specified on the command-line in the format "--option
  100. value", in the format "option value", or in a configuration file. For
  101. instance, you can tell Tor to start listening for SOCKS connections on port
  102. 9999 by passing --SocksPort 9999 or SocksPort 9999 to it on the command line,
  103. or by putting "SocksPort 9999" in the configuration file. You will need to
  104. quote options with spaces in them: if you want Tor to log all debugging
  105. messages to debug.log, you will probably need to say --Log 'debug file
  106. debug.log'.
  107. Options on the command line override those in configuration files. See the
  108. next section for more information.
  109. THE CONFIGURATION FILE FORMAT
  110. -----------------------------
  111. All configuration options in a configuration are written on a single line by
  112. default. They take the form of an option name and a value, or an option name
  113. and a quoted value (option value or option "value"). Anything after a #
  114. character is treated as a comment. Options are
  115. case-insensitive. C-style escaped characters are allowed inside quoted
  116. values. To split one configuration entry into multiple lines, use a single
  117. backslash character (\) before the end of the line. Comments can be used in
  118. such multiline entries, but they must start at the beginning of a line.
  119. By default, an option on the command line overrides an option found in the
  120. configuration file, and an option in a configuration file overrides one in
  121. the defaults file.
  122. This rule is simple for options that take a single value, but it can become
  123. complicated for options that are allowed to occur more than once: if you
  124. specify four SocksPorts in your configuration file, and one more SocksPort on
  125. the command line, the option on the command line will replace __all__ of the
  126. SocksPorts in the configuration file. If this isn't what you want, prefix
  127. the option name with a plus sign (+), and it will be appended to the previous
  128. set of options instead. For example, setting SocksPort 9100 will use only
  129. port 9100, but setting +SocksPort 9100 will use ports 9100 and 9050 (because
  130. this is the default).
  131. Alternatively, you might want to remove every instance of an option in the
  132. configuration file, and not replace it at all: you might want to say on the
  133. command line that you want no SocksPorts at all. To do that, prefix the
  134. option name with a forward slash (/). You can use the plus sign (+) and the
  135. forward slash (/) in the configuration file and on the command line.
  136. GENERAL OPTIONS
  137. ---------------
  138. [[BandwidthRate]] **BandwidthRate** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  139. A token bucket limits the average incoming bandwidth usage on this node
  140. to the specified number of bytes per second, and the average outgoing
  141. bandwidth usage to that same value. If you want to run a relay in the
  142. public network, this needs to be _at the very least_ 75 KBytes for a
  143. relay (that is, 600 kbits) or 50 KBytes for a bridge (400 kbits) -- but of
  144. course, more is better; we recommend at least 250 KBytes (2 mbits) if
  145. possible. (Default: 1 GByte) +
  146. +
  147. With this option, and in other options that take arguments in bytes,
  148. KBytes, and so on, other formats are also supported. Notably, "KBytes" can
  149. also be written as "kilobytes" or "kb"; "MBytes" can be written as
  150. "megabytes" or "MB"; "kbits" can be written as "kilobits"; and so forth.
  151. Tor also accepts "byte" and "bit" in the singular.
  152. The prefixes "tera" and "T" are also recognized.
  153. If no units are given, we default to bytes.
  154. To avoid confusion, we recommend writing "bytes" or "bits" explicitly,
  155. since it's easy to forget that "B" means bytes, not bits.
  156. [[BandwidthBurst]] **BandwidthBurst** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  157. Limit the maximum token bucket size (also known as the burst) to the given
  158. number of bytes in each direction. (Default: 1 GByte)
  159. [[MaxAdvertisedBandwidth]] **MaxAdvertisedBandwidth** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  160. If set, we will not advertise more than this amount of bandwidth for our
  161. BandwidthRate. Server operators who want to reduce the number of clients
  162. who ask to build circuits through them (since this is proportional to
  163. advertised bandwidth rate) can thus reduce the CPU demands on their server
  164. without impacting network performance.
  165. [[RelayBandwidthRate]] **RelayBandwidthRate** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  166. If not 0, a separate token bucket limits the average incoming bandwidth
  167. usage for \_relayed traffic_ on this node to the specified number of bytes
  168. per second, and the average outgoing bandwidth usage to that same value.
  169. Relayed traffic currently is calculated to include answers to directory
  170. requests, but that may change in future versions. (Default: 0)
  171. [[RelayBandwidthBurst]] **RelayBandwidthBurst** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  172. If not 0, limit the maximum token bucket size (also known as the burst) for
  173. \_relayed traffic_ to the given number of bytes in each direction.
  174. (Default: 0)
  175. [[PerConnBWRate]] **PerConnBWRate** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  176. If set, do separate rate limiting for each connection from a non-relay.
  177. You should never need to change this value, since a network-wide value is
  178. published in the consensus and your relay will use that value. (Default: 0)
  179. [[PerConnBWBurst]] **PerConnBWBurst** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  180. If set, do separate rate limiting for each connection from a non-relay.
  181. You should never need to change this value, since a network-wide value is
  182. published in the consensus and your relay will use that value. (Default: 0)
  183. [[ClientTransportPlugin]] **ClientTransportPlugin** __transport__ socks4|socks5 __IP__:__PORT__::
  184. **ClientTransportPlugin** __transport__ exec __path-to-binary__ [options]::
  185. In its first form, when set along with a corresponding Bridge line, the Tor
  186. client forwards its traffic to a SOCKS-speaking proxy on "IP:PORT". It's the
  187. duty of that proxy to properly forward the traffic to the bridge. +
  188. +
  189. In its second form, when set along with a corresponding Bridge line, the Tor
  190. client launches the pluggable transport proxy executable in
  191. __path-to-binary__ using __options__ as its command-line options, and
  192. forwards its traffic to it. It's the duty of that proxy to properly forward
  193. the traffic to the bridge.
  194. [[ServerTransportPlugin]] **ServerTransportPlugin** __transport__ exec __path-to-binary__ [options]::
  195. The Tor relay launches the pluggable transport proxy in __path-to-binary__
  196. using __options__ as its command-line options, and expects to receive
  197. proxied client traffic from it.
  198. [[ServerTransportListenAddr]] **ServerTransportListenAddr** __transport__ __IP__:__PORT__::
  199. When this option is set, Tor will suggest __IP__:__PORT__ as the
  200. listening address of any pluggable transport proxy that tries to
  201. launch __transport__.
  202. [[ServerTransportOptions]] **ServerTransportOptions** __transport__ __k=v__ __k=v__ ...::
  203. When this option is set, Tor will pass the __k=v__ parameters to
  204. any pluggable transport proxy that tries to launch __transport__. +
  205. (Example: ServerTransportOptions obfs45 shared-secret=bridgepasswd cache=/var/lib/tor/cache)
  206. [[ExtORPort]] **ExtORPort** \['address':]__port__|**auto**::
  207. Open this port to listen for Extended ORPort connections from your
  208. pluggable transports.
  209. [[ExtORPortCookieAuthFile]] **ExtORPortCookieAuthFile** __Path__::
  210. If set, this option overrides the default location and file name
  211. for the Extended ORPort's cookie file -- the cookie file is needed
  212. for pluggable transports to communicate through the Extended ORPort.
  213. [[ExtORPortCookieAuthFileGroupReadable]] **ExtORPortCookieAuthFileGroupReadable** **0**|**1**::
  214. If this option is set to 0, don't allow the filesystem group to read the
  215. Extended OR Port cookie file. If the option is set to 1, make the cookie
  216. file readable by the default GID. [Making the file readable by other
  217. groups is not yet implemented; let us know if you need this for some
  218. reason.] (Default: 0)
  219. [[ConnLimit]] **ConnLimit** __NUM__::
  220. The minimum number of file descriptors that must be available to the Tor
  221. process before it will start. Tor will ask the OS for as many file
  222. descriptors as the OS will allow (you can find this by "ulimit -H -n").
  223. If this number is less than ConnLimit, then Tor will refuse to start. +
  224. +
  225. You probably don't need to adjust this. It has no effect on Windows
  226. since that platform lacks getrlimit(). (Default: 1000)
  227. [[DisableNetwork]] **DisableNetwork** **0**|**1**::
  228. When this option is set, we don't listen for or accept any connections
  229. other than controller connections, and we close (and don't reattempt)
  230. any outbound
  231. connections. Controllers sometimes use this option to avoid using
  232. the network until Tor is fully configured. (Default: 0)
  233. [[ConstrainedSockets]] **ConstrainedSockets** **0**|**1**::
  234. If set, Tor will tell the kernel to attempt to shrink the buffers for all
  235. sockets to the size specified in **ConstrainedSockSize**. This is useful for
  236. virtual servers and other environments where system level TCP buffers may
  237. be limited. If you're on a virtual server, and you encounter the "Error
  238. creating network socket: No buffer space available" message, you are
  239. likely experiencing this problem. +
  240. +
  241. The preferred solution is to have the admin increase the buffer pool for
  242. the host itself via /proc/sys/net/ipv4/tcp_mem or equivalent facility;
  243. this configuration option is a second-resort. +
  244. +
  245. The DirPort option should also not be used if TCP buffers are scarce. The
  246. cached directory requests consume additional sockets which exacerbates
  247. the problem. +
  248. +
  249. You should **not** enable this feature unless you encounter the "no buffer
  250. space available" issue. Reducing the TCP buffers affects window size for
  251. the TCP stream and will reduce throughput in proportion to round trip
  252. time on long paths. (Default: 0)
  253. [[ConstrainedSockSize]] **ConstrainedSockSize** __N__ **bytes**|**KBytes**::
  254. When **ConstrainedSockets** is enabled the receive and transmit buffers for
  255. all sockets will be set to this limit. Must be a value between 2048 and
  256. 262144, in 1024 byte increments. Default of 8192 is recommended.
  257. [[ControlPort]] **ControlPort** __PORT__|**unix:**__path__|**auto** [__flags__]::
  258. If set, Tor will accept connections on this port and allow those
  259. connections to control the Tor process using the Tor Control Protocol
  260. (described in control-spec.txt in
  261. https://spec.torproject.org[torspec]). Note: unless you also
  262. specify one or more of **HashedControlPassword** or
  263. **CookieAuthentication**, setting this option will cause Tor to allow
  264. any process on the local host to control it. (Setting both authentication
  265. methods means eithermethod is sufficient to authenticate to Tor.) This
  266. option is required for many Tor controllers; most use the value of 9051.
  267. Set it to "auto" to have Tor pick a port for you. (Default: 0) +
  268. +
  269. Recognized flags are...
  270. **GroupWritable**;;
  271. Unix domain sockets only: makes the socket get created as
  272. group-writable.
  273. **WorldWritable**;;
  274. Unix domain sockets only: makes the socket get created as
  275. world-writable.
  276. **RelaxDirModeCheck**;;
  277. Unix domain sockets only: Do not insist that the directory
  278. that holds the socket be read-restricted.
  279. [[ControlListenAddress]] **ControlListenAddress** __IP__[:__PORT__]::
  280. Bind the controller listener to this address. If you specify a port, bind
  281. to this port rather than the one specified in ControlPort. We strongly
  282. recommend that you leave this alone unless you know what you're doing,
  283. since giving attackers access to your control listener is really
  284. dangerous. This directive can be specified multiple
  285. times to bind to multiple addresses/ports. (Default: 127.0.0.1)
  286. [[ControlSocket]] **ControlSocket** __Path__::
  287. Like ControlPort, but listens on a Unix domain socket, rather than a TCP
  288. socket. '0' disables ControlSocket (Unix and Unix-like systems only.)
  289. [[ControlSocketsGroupWritable]] **ControlSocketsGroupWritable** **0**|**1**::
  290. If this option is set to 0, don't allow the filesystem group to read and
  291. write unix sockets (e.g. ControlSocket). If the option is set to 1, make
  292. the control socket readable and writable by the default GID. (Default: 0)
  293. [[HashedControlPassword]] **HashedControlPassword** __hashed_password__::
  294. Allow connections on the control port if they present
  295. the password whose one-way hash is __hashed_password__. You
  296. can compute the hash of a password by running "tor --hash-password
  297. __password__". You can provide several acceptable passwords by using more
  298. than one HashedControlPassword line.
  299. [[CookieAuthentication]] **CookieAuthentication** **0**|**1**::
  300. If this option is set to 1, allow connections on the control port
  301. when the connecting process knows the contents of a file named
  302. "control_auth_cookie", which Tor will create in its data directory. This
  303. authentication method should only be used on systems with good filesystem
  304. security. (Default: 0)
  305. [[CookieAuthFile]] **CookieAuthFile** __Path__::
  306. If set, this option overrides the default location and file name
  307. for Tor's cookie file. (See CookieAuthentication above.)
  308. [[CookieAuthFileGroupReadable]] **CookieAuthFileGroupReadable** **0**|**1**::
  309. If this option is set to 0, don't allow the filesystem group to read the
  310. cookie file. If the option is set to 1, make the cookie file readable by
  311. the default GID. [Making the file readable by other groups is not yet
  312. implemented; let us know if you need this for some reason.] (Default: 0)
  313. [[ControlPortWriteToFile]] **ControlPortWriteToFile** __Path__::
  314. If set, Tor writes the address and port of any control port it opens to
  315. this address. Usable by controllers to learn the actual control port
  316. when ControlPort is set to "auto".
  317. [[ControlPortFileGroupReadable]] **ControlPortFileGroupReadable** **0**|**1**::
  318. If this option is set to 0, don't allow the filesystem group to read the
  319. control port file. If the option is set to 1, make the control port
  320. file readable by the default GID. (Default: 0)
  321. [[DataDirectory]] **DataDirectory** __DIR__::
  322. Store working data in DIR (Default: @LOCALSTATEDIR@/lib/tor)
  323. [[DataDirectoryGroupReadable]] **DataDirectoryGroupReadable** **0**|**1**::
  324. If this option is set to 0, don't allow the filesystem group to read the
  325. DataDirectory. If the option is set to 1, make the DataDirectory readable
  326. by the default GID. (Default: 0)
  327. [[FallbackDir]] **FallbackDir** __address__:__port__ orport=__port__ id=__fingerprint__ [weight=__num__] [ipv6=__address__:__orport__]::
  328. When we're unable to connect to any directory cache for directory info
  329. (usually because we don't know about any yet) we try a directory authority.
  330. Clients also simultaneously try a FallbackDir, to avoid hangs on client
  331. startup if a directory authority is down. Clients retry FallbackDirs more
  332. often than directory authorities, to reduce the load on the directory
  333. authorities.
  334. By default, the directory authorities are also FallbackDirs. Specifying a
  335. FallbackDir replaces Tor's default hard-coded FallbackDirs (if any).
  336. (See the **DirAuthority** entry for an explanation of each flag.)
  337. [[UseDefaultFallbackDirs]] **UseDefaultFallbackDirs** **0**|**1**::
  338. Use Tor's default hard-coded FallbackDirs (if any). (When a
  339. FallbackDir line is present, it replaces the hard-coded FallbackDirs,
  340. regardless of the value of UseDefaultFallbackDirs.) (Default: 1)
  341. [[DirAuthority]] **DirAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__::
  342. Use a nonstandard authoritative directory server at the provided address
  343. and port, with the specified key fingerprint. This option can be repeated
  344. many times, for multiple authoritative directory servers. Flags are
  345. separated by spaces, and determine what kind of an authority this directory
  346. is. By default, an authority is not authoritative for any directory style
  347. or version unless an appropriate flag is given.
  348. Tor will use this authority as a bridge authoritative directory if the
  349. "bridge" flag is set. If a flag "orport=**port**" is given, Tor will use the
  350. given port when opening encrypted tunnels to the dirserver. If a flag
  351. "weight=**num**" is given, then the directory server is chosen randomly
  352. with probability proportional to that weight (default 1.0). If a
  353. flag "v3ident=**fp**" is given, the dirserver is a v3 directory authority
  354. whose v3 long-term signing key has the fingerprint **fp**. Lastly,
  355. if an "ipv6=__address__:__orport__" flag is present, then the directory
  356. authority is listening for IPv6 connections on the indicated IPv6 address
  357. and OR Port. +
  358. +
  359. Tor will contact the authority at __address__:__port__ (the DirPort) to
  360. download directory documents. If an IPv6 address is supplied, Tor will
  361. also download directory documents at the IPv6 address on the DirPort. +
  362. +
  363. If no **DirAuthority** line is given, Tor will use the default directory
  364. authorities. NOTE: this option is intended for setting up a private Tor
  365. network with its own directory authorities. If you use it, you will be
  366. distinguishable from other users, because you won't believe the same
  367. authorities they do.
  368. [[DirAuthorityFallbackRate]] **DirAuthorityFallbackRate** __NUM__::
  369. When configured to use both directory authorities and fallback
  370. directories, the directory authorities also work as fallbacks. They are
  371. chosen with their regular weights, multiplied by this number, which
  372. should be 1.0 or less. (Default: 1.0)
  373. [[AlternateDirAuthority]] **AlternateDirAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__ +
  374. [[AlternateBridgeAuthority]] **AlternateBridgeAuthority** [__nickname__] [**flags**] __address__:__port__ __ fingerprint__::
  375. These options behave as DirAuthority, but they replace fewer of the
  376. default directory authorities. Using
  377. AlternateDirAuthority replaces the default Tor directory authorities, but
  378. leaves the default bridge authorities in
  379. place. Similarly,
  380. AlternateBridgeAuthority replaces the default bridge authority,
  381. but leaves the directory authorities alone.
  382. [[DisableAllSwap]] **DisableAllSwap** **0**|**1**::
  383. If set to 1, Tor will attempt to lock all current and future memory pages,
  384. so that memory cannot be paged out. Windows, OS X and Solaris are currently
  385. not supported. We believe that this feature works on modern Gnu/Linux
  386. distributions, and that it should work on *BSD systems (untested). This
  387. option requires that you start your Tor as root, and you should use the
  388. **User** option to properly reduce Tor's privileges. (Default: 0)
  389. [[DisableDebuggerAttachment]] **DisableDebuggerAttachment** **0**|**1**::
  390. If set to 1, Tor will attempt to prevent basic debugging attachment attempts
  391. by other processes. This may also keep Tor from generating core files if
  392. it crashes. It has no impact for users who wish to attach if they
  393. have CAP_SYS_PTRACE or if they are root. We believe that this feature
  394. works on modern Gnu/Linux distributions, and that it may also work on *BSD
  395. systems (untested). Some modern Gnu/Linux systems such as Ubuntu have the
  396. kernel.yama.ptrace_scope sysctl and by default enable it as an attempt to
  397. limit the PTRACE scope for all user processes by default. This feature will
  398. attempt to limit the PTRACE scope for Tor specifically - it will not attempt
  399. to alter the system wide ptrace scope as it may not even exist. If you wish
  400. to attach to Tor with a debugger such as gdb or strace you will want to set
  401. this to 0 for the duration of your debugging. Normal users should leave it
  402. on. Disabling this option while Tor is running is prohibited. (Default: 1)
  403. [[FetchDirInfoEarly]] **FetchDirInfoEarly** **0**|**1**::
  404. If set to 1, Tor will always fetch directory information like other
  405. directory caches, even if you don't meet the normal criteria for fetching
  406. early. Normal users should leave it off. (Default: 0)
  407. [[FetchDirInfoExtraEarly]] **FetchDirInfoExtraEarly** **0**|**1**::
  408. If set to 1, Tor will fetch directory information before other directory
  409. caches. It will attempt to download directory information closer to the
  410. start of the consensus period. Normal users should leave it off.
  411. (Default: 0)
  412. [[FetchHidServDescriptors]] **FetchHidServDescriptors** **0**|**1**::
  413. If set to 0, Tor will never fetch any hidden service descriptors from the
  414. rendezvous directories. This option is only useful if you're using a Tor
  415. controller that handles hidden service fetches for you. (Default: 1)
  416. [[FetchServerDescriptors]] **FetchServerDescriptors** **0**|**1**::
  417. If set to 0, Tor will never fetch any network status summaries or server
  418. descriptors from the directory servers. This option is only useful if
  419. you're using a Tor controller that handles directory fetches for you.
  420. (Default: 1)
  421. [[FetchUselessDescriptors]] **FetchUselessDescriptors** **0**|**1**::
  422. If set to 1, Tor will fetch every non-obsolete descriptor from the
  423. authorities that it hears about. Otherwise, it will avoid fetching useless
  424. descriptors, for example for routers that are not running. This option is
  425. useful if you're using the contributed "exitlist" script to enumerate Tor
  426. nodes that exit to certain addresses. (Default: 0)
  427. [[HTTPProxy]] **HTTPProxy** __host__[:__port__]::
  428. Tor will make all its directory requests through this host:port (or host:80
  429. if port is not specified), rather than connecting directly to any directory
  430. servers.
  431. [[HTTPProxyAuthenticator]] **HTTPProxyAuthenticator** __username:password__::
  432. If defined, Tor will use this username:password for Basic HTTP proxy
  433. authentication, as in RFC 2617. This is currently the only form of HTTP
  434. proxy authentication that Tor supports; feel free to submit a patch if you
  435. want it to support others.
  436. [[HTTPSProxy]] **HTTPSProxy** __host__[:__port__]::
  437. Tor will make all its OR (SSL) connections through this host:port (or
  438. host:443 if port is not specified), via HTTP CONNECT rather than connecting
  439. directly to servers. You may want to set **FascistFirewall** to restrict
  440. the set of ports you might try to connect to, if your HTTPS proxy only
  441. allows connecting to certain ports.
  442. [[HTTPSProxyAuthenticator]] **HTTPSProxyAuthenticator** __username:password__::
  443. If defined, Tor will use this username:password for Basic HTTPS proxy
  444. authentication, as in RFC 2617. This is currently the only form of HTTPS
  445. proxy authentication that Tor supports; feel free to submit a patch if you
  446. want it to support others.
  447. [[Sandbox]] **Sandbox** **0**|**1**::
  448. If set to 1, Tor will run securely through the use of a syscall sandbox.
  449. Otherwise the sandbox will be disabled. The option is currently an
  450. experimental feature. (Default: 0)
  451. [[Socks4Proxy]] **Socks4Proxy** __host__[:__port__]::
  452. Tor will make all OR connections through the SOCKS 4 proxy at host:port
  453. (or host:1080 if port is not specified).
  454. [[Socks5Proxy]] **Socks5Proxy** __host__[:__port__]::
  455. Tor will make all OR connections through the SOCKS 5 proxy at host:port
  456. (or host:1080 if port is not specified).
  457. [[Socks5ProxyUsername]] **Socks5ProxyUsername** __username__ +
  458. [[Socks5ProxyPassword]] **Socks5ProxyPassword** __password__::
  459. If defined, authenticate to the SOCKS 5 server using username and password
  460. in accordance to RFC 1929. Both username and password must be between 1 and
  461. 255 characters.
  462. [[SocksSocketsGroupWritable]] **SocksSocketsGroupWritable** **0**|**1**::
  463. If this option is set to 0, don't allow the filesystem group to read and
  464. write unix sockets (e.g. SocksSocket). If the option is set to 1, make
  465. the SocksSocket socket readable and writable by the default GID. (Default: 0)
  466. [[KeepalivePeriod]] **KeepalivePeriod** __NUM__::
  467. To keep firewalls from expiring connections, send a padding keepalive cell
  468. every NUM seconds on open connections that are in use. If the connection
  469. has no open circuits, it will instead be closed after NUM seconds of
  470. idleness. (Default: 5 minutes)
  471. [[Log]] **Log** __minSeverity__[-__maxSeverity__] **stderr**|**stdout**|**syslog**::
  472. Send all messages between __minSeverity__ and __maxSeverity__ to the standard
  473. output stream, the standard error stream, or to the system log. (The
  474. "syslog" value is only supported on Unix.) Recognized severity levels are
  475. debug, info, notice, warn, and err. We advise using "notice" in most cases,
  476. since anything more verbose may provide sensitive information to an
  477. attacker who obtains the logs. If only one severity level is given, all
  478. messages of that level or higher will be sent to the listed destination.
  479. [[Log2]] **Log** __minSeverity__[-__maxSeverity__] **file** __FILENAME__::
  480. As above, but send log messages to the listed filename. The
  481. "Log" option may appear more than once in a configuration file.
  482. Messages are sent to all the logs that match their severity
  483. level.
  484. [[Log3]] **Log** **[**__domain__,...**]**__minSeverity__[-__maxSeverity__] ... **file** __FILENAME__ +
  485. [[Log4]] **Log** **[**__domain__,...**]**__minSeverity__[-__maxSeverity__] ... **stderr**|**stdout**|**syslog**::
  486. As above, but select messages by range of log severity __and__ by a
  487. set of "logging domains". Each logging domain corresponds to an area of
  488. functionality inside Tor. You can specify any number of severity ranges
  489. for a single log statement, each of them prefixed by a comma-separated
  490. list of logging domains. You can prefix a domain with $$~$$ to indicate
  491. negation, and use * to indicate "all domains". If you specify a severity
  492. range without a list of domains, it matches all domains. +
  493. +
  494. This is an advanced feature which is most useful for debugging one or two
  495. of Tor's subsystems at a time. +
  496. +
  497. The currently recognized domains are: general, crypto, net, config, fs,
  498. protocol, mm, http, app, control, circ, rend, bug, dir, dirserv, or, edge,
  499. acct, hist, and handshake. Domain names are case-insensitive. +
  500. +
  501. For example, "`Log [handshake]debug [~net,~mm]info notice stdout`" sends
  502. to stdout: all handshake messages of any severity, all info-and-higher
  503. messages from domains other than networking and memory management, and all
  504. messages of severity notice or higher.
  505. [[LogMessageDomains]] **LogMessageDomains** **0**|**1**::
  506. If 1, Tor includes message domains with each log message. Every log
  507. message currently has at least one domain; most currently have exactly
  508. one. This doesn't affect controller log messages. (Default: 0)
  509. [[OutboundBindAddress]] **OutboundBindAddress** __IP__::
  510. Make all outbound connections originate from the IP address specified. This
  511. is only useful when you have multiple network interfaces, and you want all
  512. of Tor's outgoing connections to use a single one. This option may
  513. be used twice, once with an IPv4 address and once with an IPv6 address.
  514. This setting will be ignored for connections to the loopback addresses
  515. (127.0.0.0/8 and ::1).
  516. [[PidFile]] **PidFile** __FILE__::
  517. On startup, write our PID to FILE. On clean shutdown, remove
  518. FILE.
  519. [[ProtocolWarnings]] **ProtocolWarnings** **0**|**1**::
  520. If 1, Tor will log with severity \'warn' various cases of other parties not
  521. following the Tor specification. Otherwise, they are logged with severity
  522. \'info'. (Default: 0)
  523. [[PredictedPortsRelevanceTime]] **PredictedPortsRelevanceTime** __NUM__::
  524. Set how long, after the client has made an anonymized connection to a
  525. given port, we will try to make sure that we build circuits to
  526. exits that support that port. The maximum value for this option is 1
  527. hour. (Default: 1 hour)
  528. [[RunAsDaemon]] **RunAsDaemon** **0**|**1**::
  529. If 1, Tor forks and daemonizes to the background. This option has no effect
  530. on Windows; instead you should use the --service command-line option.
  531. (Default: 0)
  532. [[LogTimeGranularity]] **LogTimeGranularity** __NUM__::
  533. Set the resolution of timestamps in Tor's logs to NUM milliseconds.
  534. NUM must be positive and either a divisor or a multiple of 1 second.
  535. Note that this option only controls the granularity written by Tor to
  536. a file or console log. Tor does not (for example) "batch up" log
  537. messages to affect times logged by a controller, times attached to
  538. syslog messages, or the mtime fields on log files. (Default: 1 second)
  539. [[TruncateLogFile]] **TruncateLogFile** **0**|**1**::
  540. If 1, Tor will overwrite logs at startup and in response to a HUP signal,
  541. instead of appending to them. (Default: 0)
  542. [[SyslogIdentityTag]] **SyslogIdentityTag** __tag__::
  543. When logging to syslog, adds a tag to the syslog identity such that
  544. log entries are marked with "Tor-__tag__". (Default: none)
  545. [[SafeLogging]] **SafeLogging** **0**|**1**|**relay**::
  546. Tor can scrub potentially sensitive strings from log messages (e.g.
  547. addresses) by replacing them with the string [scrubbed]. This way logs can
  548. still be useful, but they don't leave behind personally identifying
  549. information about what sites a user might have visited. +
  550. +
  551. If this option is set to 0, Tor will not perform any scrubbing, if it is
  552. set to 1, all potentially sensitive strings are replaced. If it is set to
  553. relay, all log messages generated when acting as a relay are sanitized, but
  554. all messages generated when acting as a client are not. (Default: 1)
  555. [[User]] **User** __UID__::
  556. On startup, setuid to this user and setgid to their primary group.
  557. [[KeepBindCapabilities]] **KeepBindCapabilities** **0**|**1**|**auto**::
  558. On Linux, when we are started as root and we switch our identity using
  559. the **User** option, the **KeepBindCapabilities** option tells us whether to
  560. try to retain our ability to bind to low ports. If this value is 1, we
  561. try to keep the capability; if it is 0 we do not; and if it is **auto**,
  562. we keep the capability only if we are configured to listen on a low port.
  563. (Default: auto.)
  564. [[HardwareAccel]] **HardwareAccel** **0**|**1**::
  565. If non-zero, try to use built-in (static) crypto hardware acceleration when
  566. available. (Default: 0)
  567. [[AccelName]] **AccelName** __NAME__::
  568. When using OpenSSL hardware crypto acceleration attempt to load the dynamic
  569. engine of this name. This must be used for any dynamic hardware engine.
  570. Names can be verified with the openssl engine command.
  571. [[AccelDir]] **AccelDir** __DIR__::
  572. Specify this option if using dynamic hardware acceleration and the engine
  573. implementation library resides somewhere other than the OpenSSL default.
  574. [[AvoidDiskWrites]] **AvoidDiskWrites** **0**|**1**::
  575. If non-zero, try to write to disk less frequently than we would otherwise.
  576. This is useful when running on flash memory or other media that support
  577. only a limited number of writes. (Default: 0)
  578. [[CircuitPriorityHalflife]] **CircuitPriorityHalflife** __NUM1__::
  579. If this value is set, we override the default algorithm for choosing which
  580. circuit's cell to deliver or relay next. When the value is 0, we
  581. round-robin between the active circuits on a connection, delivering one
  582. cell from each in turn. When the value is positive, we prefer delivering
  583. cells from whichever connection has the lowest weighted cell count, where
  584. cells are weighted exponentially according to the supplied
  585. CircuitPriorityHalflife value (in seconds). If this option is not set at
  586. all, we use the behavior recommended in the current consensus
  587. networkstatus. This is an advanced option; you generally shouldn't have
  588. to mess with it. (Default: not set)
  589. [[DisableIOCP]] **DisableIOCP** **0**|**1**::
  590. If Tor was built to use the Libevent's "bufferevents" networking code
  591. and you're running on Windows, setting this option to 1 will tell Libevent
  592. not to use the Windows IOCP networking API. (Default: 1)
  593. [[UserspaceIOCPBuffers]] **UserspaceIOCPBuffers** **0**|**1**::
  594. If IOCP is enabled (see DisableIOCP above), setting this option to 1
  595. will tell Tor to disable kernel-space TCP buffers, in order to avoid
  596. needless copy operations and try not to run out of non-paged RAM.
  597. This feature is experimental; don't use it yet unless you're eager to
  598. help tracking down bugs. (Default: 0)
  599. [[UseFilteringSSLBufferevents]] **UseFilteringSSLBufferevents** **0**|**1**::
  600. Tells Tor to do its SSL communication using a chain of
  601. bufferevents: one for SSL and one for networking. This option has no
  602. effect if bufferevents are disabled (in which case it can't turn on), or
  603. if IOCP bufferevents are enabled (in which case it can't turn off). This
  604. option is useful for debugging only; most users shouldn't touch it.
  605. (Default: 0)
  606. [[CountPrivateBandwidth]] **CountPrivateBandwidth** **0**|**1**::
  607. If this option is set, then Tor's rate-limiting applies not only to
  608. remote connections, but also to connections to private addresses like
  609. 127.0.0.1 or 10.0.0.1. This is mostly useful for debugging
  610. rate-limiting. (Default: 0)
  611. CLIENT OPTIONS
  612. --------------
  613. The following options are useful only for clients (that is, if
  614. **SocksPort**, **TransPort**, **DNSPort**, or **NATDPort** is non-zero):
  615. [[AllowInvalidNodes]] **AllowInvalidNodes** **entry**|**exit**|**middle**|**introduction**|**rendezvous**|**...**::
  616. If some Tor servers are obviously not working right, the directory
  617. authorities can manually mark them as invalid, meaning that it's not
  618. recommended you use them for entry or exit positions in your circuits. You
  619. can opt to use them in some circuit positions, though. The default is
  620. "middle,rendezvous", and other choices are not advised.
  621. [[ExcludeSingleHopRelays]] **ExcludeSingleHopRelays** **0**|**1**::
  622. This option controls whether circuits built by Tor will include relays with
  623. the AllowSingleHopExits flag set to true. If ExcludeSingleHopRelays is set
  624. to 0, these relays will be included. Note that these relays might be at
  625. higher risk of being seized or observed, so they are not normally
  626. included. Also note that relatively few clients turn off this option,
  627. so using these relays might make your client stand out.
  628. (Default: 1)
  629. [[Bridge]] **Bridge** [__transport__] __IP__:__ORPort__ [__fingerprint__]::
  630. When set along with UseBridges, instructs Tor to use the relay at
  631. "IP:ORPort" as a "bridge" relaying into the Tor network. If "fingerprint"
  632. is provided (using the same format as for DirAuthority), we will verify that
  633. the relay running at that location has the right fingerprint. We also use
  634. fingerprint to look up the bridge descriptor at the bridge authority, if
  635. it's provided and if UpdateBridgesFromAuthority is set too. +
  636. +
  637. If "transport" is provided, it must match a ClientTransportPlugin line. We
  638. then use that pluggable transport's proxy to transfer data to the bridge,
  639. rather than connecting to the bridge directly. Some transports use a
  640. transport-specific method to work out the remote address to connect to.
  641. These transports typically ignore the "IP:ORPort" specified in the bridge
  642. line.
  643. [[LearnCircuitBuildTimeout]] **LearnCircuitBuildTimeout** **0**|**1**::
  644. If 0, CircuitBuildTimeout adaptive learning is disabled. (Default: 1)
  645. [[CircuitBuildTimeout]] **CircuitBuildTimeout** __NUM__::
  646. Try for at most NUM seconds when building circuits. If the circuit isn't
  647. open in that time, give up on it. If LearnCircuitBuildTimeout is 1, this
  648. value serves as the initial value to use before a timeout is learned. If
  649. LearnCircuitBuildTimeout is 0, this value is the only value used.
  650. (Default: 60 seconds)
  651. [[CircuitIdleTimeout]] **CircuitIdleTimeout** __NUM__::
  652. If we have kept a clean (never used) circuit around for NUM seconds, then
  653. close it. This way when the Tor client is entirely idle, it can expire all
  654. of its circuits, and then expire its TLS connections. Also, if we end up
  655. making a circuit that is not useful for exiting any of the requests we're
  656. receiving, it won't forever take up a slot in the circuit list. (Default: 1
  657. hour)
  658. [[CircuitStreamTimeout]] **CircuitStreamTimeout** __NUM__::
  659. If non-zero, this option overrides our internal timeout schedule for how
  660. many seconds until we detach a stream from a circuit and try a new circuit.
  661. If your network is particularly slow, you might want to set this to a
  662. number like 60. (Default: 0)
  663. [[ClientOnly]] **ClientOnly** **0**|**1**::
  664. If set to 1, Tor will not run as a relay or serve
  665. directory requests, even if the ORPort, ExtORPort, or DirPort options are
  666. set. (This config option is
  667. mostly unnecessary: we added it back when we were considering having
  668. Tor clients auto-promote themselves to being relays if they were stable
  669. and fast enough. The current behavior is simply that Tor is a client
  670. unless ORPort, ExtORPort, or DirPort are configured.) (Default: 0)
  671. [[ExcludeNodes]] **ExcludeNodes** __node__,__node__,__...__::
  672. A list of identity fingerprints, country codes, and address
  673. patterns of nodes to avoid when building a circuit. Country codes are
  674. 2-letter ISO3166 codes, and must
  675. be wrapped in braces; fingerprints may be preceded by a dollar sign.
  676. (Example:
  677. ExcludeNodes ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
  678. +
  679. By default, this option is treated as a preference that Tor is allowed
  680. to override in order to keep working.
  681. For example, if you try to connect to a hidden service,
  682. but you have excluded all of the hidden service's introduction points,
  683. Tor will connect to one of them anyway. If you do not want this
  684. behavior, set the StrictNodes option (documented below). +
  685. +
  686. Note also that if you are a relay, this (and the other node selection
  687. options below) only affects your own circuits that Tor builds for you.
  688. Clients can still build circuits through you to any node. Controllers
  689. can tell Tor to build circuits through any node. +
  690. +
  691. Country codes are case-insensitive. The code "\{??}" refers to nodes whose
  692. country can't be identified. No country code, including \{??}, works if
  693. no GeoIPFile can be loaded. See also the GeoIPExcludeUnknown option below.
  694. [[ExcludeExitNodes]] **ExcludeExitNodes** __node__,__node__,__...__::
  695. A list of identity fingerprints, country codes, and address
  696. patterns of nodes to never use when picking an exit node---that is, a
  697. node that delivers traffic for you outside the Tor network. Note that any
  698. node listed in ExcludeNodes is automatically considered to be part of this
  699. list too. See
  700. the **ExcludeNodes** option for more information on how to specify
  701. nodes. See also the caveats on the "ExitNodes" option below.
  702. [[GeoIPExcludeUnknown]] **GeoIPExcludeUnknown** **0**|**1**|**auto**::
  703. If this option is set to 'auto', then whenever any country code is set in
  704. ExcludeNodes or ExcludeExitNodes, all nodes with unknown country (\{??} and
  705. possibly \{A1}) are treated as excluded as well. If this option is set to
  706. '1', then all unknown countries are treated as excluded in ExcludeNodes
  707. and ExcludeExitNodes. This option has no effect when a GeoIP file isn't
  708. configured or can't be found. (Default: auto)
  709. [[ExitNodes]] **ExitNodes** __node__,__node__,__...__::
  710. A list of identity fingerprints, country codes, and address
  711. patterns of nodes to use as exit node---that is, a
  712. node that delivers traffic for you outside the Tor network. See
  713. the **ExcludeNodes** option for more information on how to specify nodes. +
  714. +
  715. Note that if you list too few nodes here, or if you exclude too many exit
  716. nodes with ExcludeExitNodes, you can degrade functionality. For example,
  717. if none of the exits you list allows traffic on port 80 or 443, you won't
  718. be able to browse the web. +
  719. +
  720. Note also that not every circuit is used to deliver traffic outside of
  721. the Tor network. It is normal to see non-exit circuits (such as those
  722. used to connect to hidden services, those that do directory fetches,
  723. those used for relay reachability self-tests, and so on) that end
  724. at a non-exit node. To
  725. keep a node from being used entirely, see ExcludeNodes and StrictNodes. +
  726. +
  727. The ExcludeNodes option overrides this option: any node listed in both
  728. ExitNodes and ExcludeNodes is treated as excluded. +
  729. +
  730. The .exit address notation, if enabled via AllowDotExit, overrides
  731. this option.
  732. [[EntryNodes]] **EntryNodes** __node__,__node__,__...__::
  733. A list of identity fingerprints and country codes of nodes
  734. to use for the first hop in your normal circuits.
  735. Normal circuits include all
  736. circuits except for direct connections to directory servers. The Bridge
  737. option overrides this option; if you have configured bridges and
  738. UseBridges is 1, the Bridges are used as your entry nodes. +
  739. +
  740. The ExcludeNodes option overrides this option: any node listed in both
  741. EntryNodes and ExcludeNodes is treated as excluded. See
  742. the **ExcludeNodes** option for more information on how to specify nodes.
  743. [[StrictNodes]] **StrictNodes** **0**|**1**::
  744. If StrictNodes is set to 1, Tor will treat the ExcludeNodes option as a
  745. requirement to follow for all the circuits you generate, even if doing so
  746. will break functionality for you. If StrictNodes is set to 0, Tor will
  747. still try to avoid nodes in the ExcludeNodes list, but it will err on the
  748. side of avoiding unexpected errors. Specifically, StrictNodes 0 tells
  749. Tor that it is okay to use an excluded node when it is *necessary* to
  750. perform relay reachability self-tests, connect to
  751. a hidden service, provide a hidden service to a client, fulfill a .exit
  752. request, upload directory information, or download directory information.
  753. (Default: 0)
  754. [[FascistFirewall]] **FascistFirewall** **0**|**1**::
  755. If 1, Tor will only create outgoing connections to ORs running on ports
  756. that your firewall allows (defaults to 80 and 443; see **FirewallPorts**).
  757. This will allow you to run Tor as a client behind a firewall with
  758. restrictive policies, but will not allow you to run as a server behind such
  759. a firewall. If you prefer more fine-grained control, use
  760. ReachableAddresses instead.
  761. [[FirewallPorts]] **FirewallPorts** __PORTS__::
  762. A list of ports that your firewall allows you to connect to. Only used when
  763. **FascistFirewall** is set. This option is deprecated; use ReachableAddresses
  764. instead. (Default: 80, 443)
  765. [[ReachableAddresses]] **ReachableAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  766. A comma-separated list of IP addresses and ports that your firewall allows
  767. you to connect to. The format is as for the addresses in ExitPolicy, except
  768. that "accept" is understood unless "reject" is explicitly provided. For
  769. example, \'ReachableAddresses 99.0.0.0/8, reject 18.0.0.0/8:80, accept
  770. \*:80' means that your firewall allows connections to everything inside net
  771. 99, rejects port 80 connections to net 18, and accepts connections to port
  772. 80 otherwise. (Default: \'accept \*:*'.)
  773. [[ReachableDirAddresses]] **ReachableDirAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  774. Like **ReachableAddresses**, a list of addresses and ports. Tor will obey
  775. these restrictions when fetching directory information, using standard HTTP
  776. GET requests. If not set explicitly then the value of
  777. **ReachableAddresses** is used. If **HTTPProxy** is set then these
  778. connections will go through that proxy.
  779. [[ReachableORAddresses]] **ReachableORAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  780. Like **ReachableAddresses**, a list of addresses and ports. Tor will obey
  781. these restrictions when connecting to Onion Routers, using TLS/SSL. If not
  782. set explicitly then the value of **ReachableAddresses** is used. If
  783. **HTTPSProxy** is set then these connections will go through that proxy. +
  784. +
  785. The separation between **ReachableORAddresses** and
  786. **ReachableDirAddresses** is only interesting when you are connecting
  787. through proxies (see **HTTPProxy** and **HTTPSProxy**). Most proxies limit
  788. TLS connections (which Tor uses to connect to Onion Routers) to port 443,
  789. and some limit HTTP GET requests (which Tor uses for fetching directory
  790. information) to port 80.
  791. [[HidServAuth]] **HidServAuth** __onion-address__ __auth-cookie__ [__service-name__]::
  792. Client authorization for a hidden service. Valid onion addresses contain 16
  793. characters in a-z2-7 plus ".onion", and valid auth cookies contain 22
  794. characters in A-Za-z0-9+/. The service name is only used for internal
  795. purposes, e.g., for Tor controllers. This option may be used multiple times
  796. for different hidden services. If a hidden service uses authorization and
  797. this option is not set, the hidden service is not accessible. Hidden
  798. services can be configured to require authorization using the
  799. **HiddenServiceAuthorizeClient** option.
  800. [[CloseHSClientCircuitsImmediatelyOnTimeout]] **CloseHSClientCircuitsImmediatelyOnTimeout** **0**|**1**::
  801. If 1, Tor will close unfinished hidden service client circuits
  802. which have not moved closer to connecting to their destination
  803. hidden service when their internal state has not changed for the
  804. duration of the current circuit-build timeout. Otherwise, such
  805. circuits will be left open, in the hope that they will finish
  806. connecting to their destination hidden services. In either case,
  807. another set of introduction and rendezvous circuits for the same
  808. destination hidden service will be launched. (Default: 0)
  809. [[CloseHSServiceRendCircuitsImmediatelyOnTimeout]] **CloseHSServiceRendCircuitsImmediatelyOnTimeout** **0**|**1**::
  810. If 1, Tor will close unfinished hidden-service-side rendezvous
  811. circuits after the current circuit-build timeout. Otherwise, such
  812. circuits will be left open, in the hope that they will finish
  813. connecting to their destinations. In either case, another
  814. rendezvous circuit for the same destination client will be
  815. launched. (Default: 0)
  816. [[LongLivedPorts]] **LongLivedPorts** __PORTS__::
  817. A list of ports for services that tend to have long-running connections
  818. (e.g. chat and interactive shells). Circuits for streams that use these
  819. ports will contain only high-uptime nodes, to reduce the chance that a node
  820. will go down before the stream is finished. Note that the list is also
  821. honored for circuits (both client and service side) involving hidden
  822. services whose virtual port is in this list. (Default: 21, 22, 706,
  823. 1863, 5050, 5190, 5222, 5223, 6523, 6667, 6697, 8300)
  824. [[MapAddress]] **MapAddress** __address__ __newaddress__::
  825. When a request for address arrives to Tor, it will transform to newaddress
  826. before processing it. For example, if you always want connections to
  827. www.example.com to exit via __torserver__ (where __torserver__ is the
  828. fingerprint of the server), use "MapAddress www.example.com
  829. www.example.com.torserver.exit". If the value is prefixed with a
  830. "\*.", matches an entire domain. For example, if you
  831. always want connections to example.com and any if its subdomains
  832. to exit via
  833. __torserver__ (where __torserver__ is the fingerprint of the server), use
  834. "MapAddress \*.example.com \*.example.com.torserver.exit". (Note the
  835. leading "*." in each part of the directive.) You can also redirect all
  836. subdomains of a domain to a single address. For example, "MapAddress
  837. *.example.com www.example.com". +
  838. +
  839. NOTES:
  840. 1. When evaluating MapAddress expressions Tor stops when it hits the most
  841. recently added expression that matches the requested address. So if you
  842. have the following in your torrc, www.torproject.org will map to 1.1.1.1:
  843. MapAddress www.torproject.org 2.2.2.2
  844. MapAddress www.torproject.org 1.1.1.1
  845. 2. Tor evaluates the MapAddress configuration until it finds no matches. So
  846. if you have the following in your torrc, www.torproject.org will map to
  847. 2.2.2.2:
  848. MapAddress 1.1.1.1 2.2.2.2
  849. MapAddress www.torproject.org 1.1.1.1
  850. 3. The following MapAddress expression is invalid (and will be
  851. ignored) because you cannot map from a specific address to a wildcard
  852. address:
  853. MapAddress www.torproject.org *.torproject.org.torserver.exit
  854. 4. Using a wildcard to match only part of a string (as in *ample.com) is
  855. also invalid.
  856. [[NewCircuitPeriod]] **NewCircuitPeriod** __NUM__::
  857. Every NUM seconds consider whether to build a new circuit. (Default: 30
  858. seconds)
  859. [[MaxCircuitDirtiness]] **MaxCircuitDirtiness** __NUM__::
  860. Feel free to reuse a circuit that was first used at most NUM seconds ago,
  861. but never attach a new stream to a circuit that is too old. For hidden
  862. services, this applies to the __last__ time a circuit was used, not the
  863. first. Circuits with streams constructed with SOCKS authentication via
  864. SocksPorts that have **KeepAliveIsolateSOCKSAuth** ignore this value.
  865. (Default: 10 minutes)
  866. [[MaxClientCircuitsPending]] **MaxClientCircuitsPending** __NUM__::
  867. Do not allow more than NUM circuits to be pending at a time for handling
  868. client streams. A circuit is pending if we have begun constructing it,
  869. but it has not yet been completely constructed. (Default: 32)
  870. [[NodeFamily]] **NodeFamily** __node__,__node__,__...__::
  871. The Tor servers, defined by their identity fingerprints,
  872. constitute a "family" of similar or co-administered servers, so never use
  873. any two of them in the same circuit. Defining a NodeFamily is only needed
  874. when a server doesn't list the family itself (with MyFamily). This option
  875. can be used multiple times; each instance defines a separate family. In
  876. addition to nodes, you can also list IP address and ranges and country
  877. codes in {curly braces}. See the **ExcludeNodes** option for more
  878. information on how to specify nodes.
  879. [[EnforceDistinctSubnets]] **EnforceDistinctSubnets** **0**|**1**::
  880. If 1, Tor will not put two servers whose IP addresses are "too close" on
  881. the same circuit. Currently, two addresses are "too close" if they lie in
  882. the same /16 range. (Default: 1)
  883. [[SocksPort]] **SocksPort** \['address':]__port__|**unix:**__path__|**auto** [_flags_] [_isolation flags_]::
  884. Open this port to listen for connections from SOCKS-speaking
  885. applications. Set this to 0 if you don't want to allow application
  886. connections via SOCKS. Set it to "auto" to have Tor pick a port for
  887. you. This directive can be specified multiple times to bind
  888. to multiple addresses/ports. (Default: 9050) +
  889. +
  890. NOTE: Although this option allows you to specify an IP address
  891. other than localhost, you should do so only with extreme caution.
  892. The SOCKS protocol is unencrypted and (as we use it)
  893. unauthenticated, so exposing it in this way could leak your
  894. information to anybody watching your network, and allow anybody
  895. to use your computer as an open proxy. +
  896. +
  897. The _isolation flags_ arguments give Tor rules for which streams
  898. received on this SocksPort are allowed to share circuits with one
  899. another. Recognized isolation flags are:
  900. **IsolateClientAddr**;;
  901. Don't share circuits with streams from a different
  902. client address. (On by default and strongly recommended;
  903. you can disable it with **NoIsolateClientAddr**.)
  904. **IsolateSOCKSAuth**;;
  905. Don't share circuits with streams for which different
  906. SOCKS authentication was provided. (On by default;
  907. you can disable it with **NoIsolateSOCKSAuth**.)
  908. **IsolateClientProtocol**;;
  909. Don't share circuits with streams using a different protocol.
  910. (SOCKS 4, SOCKS 5, TransPort connections, NATDPort connections,
  911. and DNSPort requests are all considered to be different protocols.)
  912. **IsolateDestPort**;;
  913. Don't share circuits with streams targeting a different
  914. destination port.
  915. **IsolateDestAddr**;;
  916. Don't share circuits with streams targeting a different
  917. destination address.
  918. **KeepAliveIsolateSOCKSAuth**;;
  919. If **IsolateSOCKSAuth** is enabled, keep alive circuits that have
  920. streams with SOCKS authentication set indefinitely.
  921. **SessionGroup=**__INT__;;
  922. If no other isolation rules would prevent it, allow streams
  923. on this port to share circuits with streams from every other
  924. port with the same session group. (By default, streams received
  925. on different SocksPorts, TransPorts, etc are always isolated from one
  926. another. This option overrides that behavior.)
  927. [[OtherSocksPortFlags]]::
  928. Other recognized __flags__ for a SocksPort are:
  929. **NoIPv4Traffic**;;
  930. Tell exits to not connect to IPv4 addresses in response to SOCKS
  931. requests on this connection.
  932. **IPv6Traffic**;;
  933. Tell exits to allow IPv6 addresses in response to SOCKS requests on
  934. this connection, so long as SOCKS5 is in use. (SOCKS4 can't handle
  935. IPv6.)
  936. **PreferIPv6**;;
  937. Tells exits that, if a host has both an IPv4 and an IPv6 address,
  938. we would prefer to connect to it via IPv6. (IPv4 is the default.) +
  939. **CacheIPv4DNS**;;
  940. Tells the client to remember IPv4 DNS answers we receive from exit
  941. nodes via this connection. (On by default.)
  942. **CacheIPv6DNS**;;
  943. Tells the client to remember IPv6 DNS answers we receive from exit
  944. nodes via this connection.
  945. **GroupWritable**;;
  946. Unix domain sockets only: makes the socket get created as
  947. group-writable.
  948. **WorldWritable**;;
  949. Unix domain sockets only: makes the socket get created as
  950. world-writable.
  951. **CacheDNS**;;
  952. Tells the client to remember all DNS answers we receive from exit
  953. nodes via this connection.
  954. **UseIPv4Cache**;;
  955. Tells the client to use any cached IPv4 DNS answers we have when making
  956. requests via this connection. (NOTE: This option, along UseIPv6Cache
  957. and UseDNSCache, can harm your anonymity, and probably
  958. won't help performance as much as you might expect. Use with care!)
  959. **UseIPv6Cache**;;
  960. Tells the client to use any cached IPv6 DNS answers we have when making
  961. requests via this connection.
  962. **UseDNSCache**;;
  963. Tells the client to use any cached DNS answers we have when making
  964. requests via this connection.
  965. **PreferIPv6Automap**;;
  966. When serving a hostname lookup request on this port that
  967. should get automapped (according to AutomapHostsOnResolve),
  968. if we could return either an IPv4 or an IPv6 answer, prefer
  969. an IPv6 answer. (On by default.)
  970. **PreferSOCKSNoAuth**;;
  971. Ordinarily, when an application offers both "username/password
  972. authentication" and "no authentication" to Tor via SOCKS5, Tor
  973. selects username/password authentication so that IsolateSOCKSAuth can
  974. work. This can confuse some applications, if they offer a
  975. username/password combination then get confused when asked for
  976. one. You can disable this behavior, so that Tor will select "No
  977. authentication" when IsolateSOCKSAuth is disabled, or when this
  978. option is set.
  979. [[SocksListenAddress]] **SocksListenAddress** __IP__[:__PORT__]::
  980. Bind to this address to listen for connections from Socks-speaking
  981. applications. (Default: 127.0.0.1) You can also specify a port (e.g.
  982. 192.168.0.1:9100). This directive can be specified multiple times to bind
  983. to multiple addresses/ports. (DEPRECATED: As of 0.2.3.x-alpha, you can
  984. now use multiple SocksPort entries, and provide addresses for SocksPort
  985. entries, so SocksListenAddress no longer has a purpose. For backward
  986. compatibility, SocksListenAddress is only allowed when SocksPort is just
  987. a port number.)
  988. [[SocksPolicy]] **SocksPolicy** __policy__,__policy__,__...__::
  989. Set an entrance policy for this server, to limit who can connect to the
  990. SocksPort and DNSPort ports. The policies have the same form as exit
  991. policies below, except that port specifiers are ignored. Any address
  992. not matched by some entry in the policy is accepted.
  993. [[SocksTimeout]] **SocksTimeout** __NUM__::
  994. Let a socks connection wait NUM seconds handshaking, and NUM seconds
  995. unattached waiting for an appropriate circuit, before we fail it. (Default:
  996. 2 minutes)
  997. [[TokenBucketRefillInterval]] **TokenBucketRefillInterval** __NUM__ [**msec**|**second**]::
  998. Set the refill interval of Tor's token bucket to NUM milliseconds.
  999. NUM must be between 1 and 1000, inclusive. Note that the configured
  1000. bandwidth limits are still expressed in bytes per second: this
  1001. option only affects the frequency with which Tor checks to see whether
  1002. previously exhausted connections may read again. (Default: 100 msec)
  1003. [[TrackHostExits]] **TrackHostExits** __host__,__.domain__,__...__::
  1004. For each value in the comma separated list, Tor will track recent
  1005. connections to hosts that match this value and attempt to reuse the same
  1006. exit node for each. If the value is prepended with a \'.\', it is treated as
  1007. matching an entire domain. If one of the values is just a \'.', it means
  1008. match everything. This option is useful if you frequently connect to sites
  1009. that will expire all your authentication cookies (i.e. log you out) if
  1010. your IP address changes. Note that this option does have the disadvantage
  1011. of making it more clear that a given history is associated with a single
  1012. user. However, most people who would wish to observe this will observe it
  1013. through cookies or other protocol-specific means anyhow.
  1014. [[TrackHostExitsExpire]] **TrackHostExitsExpire** __NUM__::
  1015. Since exit servers go up and down, it is desirable to expire the
  1016. association between host and exit server after NUM seconds. The default is
  1017. 1800 seconds (30 minutes).
  1018. [[UpdateBridgesFromAuthority]] **UpdateBridgesFromAuthority** **0**|**1**::
  1019. When set (along with UseBridges), Tor will try to fetch bridge descriptors
  1020. from the configured bridge authorities when feasible. It will fall back to
  1021. a direct request if the authority responds with a 404. (Default: 0)
  1022. [[UseBridges]] **UseBridges** **0**|**1**::
  1023. When set, Tor will fetch descriptors for each bridge listed in the "Bridge"
  1024. config lines, and use these relays as both entry guards and directory
  1025. guards. (Default: 0)
  1026. [[UseEntryGuards]] **UseEntryGuards** **0**|**1**::
  1027. If this option is set to 1, we pick a few long-term entry servers, and try
  1028. to stick with them. This is desirable because constantly changing servers
  1029. increases the odds that an adversary who owns some servers will observe a
  1030. fraction of your paths. (Default: 1)
  1031. [[UseEntryGuardsAsDirGuards]] **UseEntryGuardsAsDirGuards** **0**|**1**::
  1032. If this option is set to 1, and UseEntryGuards is also set to 1,
  1033. we try to use our entry guards as directory
  1034. guards, and failing that, pick more nodes to act as our directory guards.
  1035. This helps prevent an adversary from enumerating clients. It's only
  1036. available for clients (non-relay, non-bridge) that aren't configured to
  1037. download any non-default directory material. It doesn't currently
  1038. do anything when we lack a live consensus. (Default: 1)
  1039. [[GuardfractionFile]] **GuardfractionFile** __FILENAME__::
  1040. V3 authoritative directories only. Configures the location of the
  1041. guardfraction file which contains information about how long relays
  1042. have been guards. (Default: unset)
  1043. [[UseGuardFraction]] **UseGuardFraction** **0**|**1**|**auto**::
  1044. This torrc option specifies whether clients should use the
  1045. guardfraction information found in the consensus during path
  1046. selection. If it's set to 'auto', clients will do what the
  1047. UseGuardFraction consensus parameter tells them to do. (Default: auto)
  1048. [[NumEntryGuards]] **NumEntryGuards** __NUM__::
  1049. If UseEntryGuards is set to 1, we will try to pick a total of NUM routers
  1050. as long-term entries for our circuits. If NUM is 0, we try to learn
  1051. the number from the NumEntryGuards consensus parameter, and default
  1052. to 3 if the consensus parameter isn't set. (Default: 0)
  1053. [[NumDirectoryGuards]] **NumDirectoryGuards** __NUM__::
  1054. If UseEntryGuardsAsDirectoryGuards is enabled, we try to make sure we
  1055. have at least NUM routers to use as directory guards. If this option
  1056. is set to 0, use the value from the NumDirectoryGuards consensus
  1057. parameter, falling back to the value from NumEntryGuards if the
  1058. consensus parameter is 0 or isn't set. (Default: 0)
  1059. [[GuardLifetime]] **GuardLifetime** __N__ **days**|**weeks**|**months**::
  1060. If nonzero, and UseEntryGuards is set, minimum time to keep a guard before
  1061. picking a new one. If zero, we use the GuardLifetime parameter from the
  1062. consensus directory. No value here may be less than 1 month or greater
  1063. than 5 years; out-of-range values are clamped. (Default: 0)
  1064. [[SafeSocks]] **SafeSocks** **0**|**1**::
  1065. When this option is enabled, Tor will reject application connections that
  1066. use unsafe variants of the socks protocol -- ones that only provide an IP
  1067. address, meaning the application is doing a DNS resolve first.
  1068. Specifically, these are socks4 and socks5 when not doing remote DNS.
  1069. (Default: 0)
  1070. [[TestSocks]] **TestSocks** **0**|**1**::
  1071. When this option is enabled, Tor will make a notice-level log entry for
  1072. each connection to the Socks port indicating whether the request used a
  1073. safe socks protocol or an unsafe one (see above entry on SafeSocks). This
  1074. helps to determine whether an application using Tor is possibly leaking
  1075. DNS requests. (Default: 0)
  1076. [[WarnUnsafeSocks]] **WarnUnsafeSocks** **0**|**1**::
  1077. When this option is enabled, Tor will warn whenever a request is
  1078. received that only contains an IP address instead of a hostname. Allowing
  1079. applications to do DNS resolves themselves is usually a bad idea and
  1080. can leak your location to attackers. (Default: 1)
  1081. [[VirtualAddrNetworkIPv4]] **VirtualAddrNetworkIPv4** __Address__/__bits__ +
  1082. [[VirtualAddrNetworkIPv6]] **VirtualAddrNetworkIPv6** [__Address__]/__bits__::
  1083. When Tor needs to assign a virtual (unused) address because of a MAPADDRESS
  1084. command from the controller or the AutomapHostsOnResolve feature, Tor
  1085. picks an unassigned address from this range. (Defaults:
  1086. 127.192.0.0/10 and [FE80::]/10 respectively.) +
  1087. +
  1088. When providing proxy server service to a network of computers using a tool
  1089. like dns-proxy-tor, change the IPv4 network to "10.192.0.0/10" or
  1090. "172.16.0.0/12" and change the IPv6 network to "[FC00]/7".
  1091. The default **VirtualAddrNetwork** address ranges on a
  1092. properly configured machine will route to the loopback or link-local
  1093. interface. For
  1094. local use, no change to the default VirtualAddrNetwork setting is needed.
  1095. [[AllowNonRFC953Hostnames]] **AllowNonRFC953Hostnames** **0**|**1**::
  1096. When this option is disabled, Tor blocks hostnames containing illegal
  1097. characters (like @ and :) rather than sending them to an exit node to be
  1098. resolved. This helps trap accidental attempts to resolve URLs and so on.
  1099. (Default: 0)
  1100. [[AllowDotExit]] **AllowDotExit** **0**|**1**::
  1101. If enabled, we convert "www.google.com.foo.exit" addresses on the
  1102. SocksPort/TransPort/NATDPort into "www.google.com" addresses that exit from
  1103. the node "foo". Disabled by default since attacking websites and exit
  1104. relays can use it to manipulate your path selection. (Default: 0)
  1105. [[FastFirstHopPK]] **FastFirstHopPK** **0**|**1**|**auto**::
  1106. When this option is disabled, Tor uses the public key step for the first
  1107. hop of creating circuits. Skipping it is generally safe since we have
  1108. already used TLS to authenticate the relay and to establish forward-secure
  1109. keys. Turning this option off makes circuit building a little
  1110. slower. Setting this option to "auto" takes advice from the authorities
  1111. in the latest consensus about whether to use this feature. +
  1112. +
  1113. Note that Tor will always use the public key step for the first hop if it's
  1114. operating as a relay, and it will never use the public key step if it
  1115. doesn't yet know the onion key of the first hop. (Default: auto)
  1116. [[TransPort]] **TransPort** \['address':]__port__|**auto** [_isolation flags_]::
  1117. Open this port to listen for transparent proxy connections. Set this to
  1118. 0 if you don't want to allow transparent proxy connections. Set the port
  1119. to "auto" to have Tor pick a port for you. This directive can be
  1120. specified multiple times to bind to multiple addresses/ports. See
  1121. SOCKSPort for an explanation of isolation flags. +
  1122. +
  1123. TransPort requires OS support for transparent proxies, such as BSDs' pf or
  1124. Linux's IPTables. If you're planning to use Tor as a transparent proxy for
  1125. a network, you'll want to examine and change VirtualAddrNetwork from the
  1126. default setting. You'll also want to set the TransListenAddress option for
  1127. the network you'd like to proxy. (Default: 0)
  1128. [[TransListenAddress]] **TransListenAddress** __IP__[:__PORT__]::
  1129. Bind to this address to listen for transparent proxy connections. (Default:
  1130. 127.0.0.1). This is useful for exporting a transparent proxy server to an
  1131. entire network. (DEPRECATED: As of 0.2.3.x-alpha, you can
  1132. now use multiple TransPort entries, and provide addresses for TransPort
  1133. entries, so TransListenAddress no longer has a purpose. For backward
  1134. compatibility, TransListenAddress is only allowed when TransPort is just
  1135. a port number.)
  1136. [[TransProxyType]] **TransProxyType** **default**|**TPROXY**|**ipfw**|**pf-divert**::
  1137. TransProxyType may only be enabled when there is transparent proxy listener
  1138. enabled.
  1139. +
  1140. Set this to "TPROXY" if you wish to be able to use the TPROXY Linux module
  1141. to transparently proxy connections that are configured using the TransPort
  1142. option. This setting lets the listener on the TransPort accept connections
  1143. for all addresses, even when the TransListenAddress is configured for an
  1144. internal address. Detailed information on how to configure the TPROXY
  1145. feature can be found in the Linux kernel source tree in the file
  1146. Documentation/networking/tproxy.txt.
  1147. +
  1148. Set this option to "ipfw" to use the FreeBSD ipfw interface.
  1149. +
  1150. On *BSD operating systems when using pf, set this to "pf-divert" to take
  1151. advantage of +divert-to+ rules, which do not modify the packets like
  1152. +rdr-to+ rules do. Detailed information on how to configure pf to use
  1153. +divert-to+ rules can be found in the pf.conf(5) manual page. On OpenBSD,
  1154. +divert-to+ is available to use on versions greater than or equal to
  1155. OpenBSD 4.4.
  1156. +
  1157. Set this to "default", or leave it unconfigured, to use regular IPTables
  1158. on Linux, or to use pf +rdr-to+ rules on *BSD systems.
  1159. +
  1160. (Default: "default".)
  1161. [[NATDPort]] **NATDPort** \['address':]__port__|**auto** [_isolation flags_]::
  1162. Open this port to listen for connections from old versions of ipfw (as
  1163. included in old versions of FreeBSD, etc) using the NATD protocol.
  1164. Use 0 if you don't want to allow NATD connections. Set the port
  1165. to "auto" to have Tor pick a port for you. This directive can be
  1166. specified multiple times to bind to multiple addresses/ports. See
  1167. SocksPort for an explanation of isolation flags. +
  1168. +
  1169. This option is only for people who cannot use TransPort. (Default: 0)
  1170. [[NATDListenAddress]] **NATDListenAddress** __IP__[:__PORT__]::
  1171. Bind to this address to listen for NATD connections. (DEPRECATED: As of
  1172. 0.2.3.x-alpha, you can now use multiple NATDPort entries, and provide
  1173. addresses for NATDPort entries, so NATDListenAddress no longer has a
  1174. purpose. For backward compatibility, NATDListenAddress is only allowed
  1175. when NATDPort is just a port number.)
  1176. [[AutomapHostsOnResolve]] **AutomapHostsOnResolve** **0**|**1**::
  1177. When this option is enabled, and we get a request to resolve an address
  1178. that ends with one of the suffixes in **AutomapHostsSuffixes**, we map an
  1179. unused virtual address to that address, and return the new virtual address.
  1180. This is handy for making ".onion" addresses work with applications that
  1181. resolve an address and then connect to it. (Default: 0)
  1182. [[AutomapHostsSuffixes]] **AutomapHostsSuffixes** __SUFFIX__,__SUFFIX__,__...__::
  1183. A comma-separated list of suffixes to use with **AutomapHostsOnResolve**.
  1184. The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).
  1185. [[DNSPort]] **DNSPort** \['address':]__port__|**auto** [_isolation flags_]::
  1186. If non-zero, open this port to listen for UDP DNS requests, and resolve
  1187. them anonymously. This port only handles A, AAAA, and PTR requests---it
  1188. doesn't handle arbitrary DNS request types. Set the port to "auto" to
  1189. have Tor pick a port for
  1190. you. This directive can be specified multiple times to bind to multiple
  1191. addresses/ports. See SocksPort for an explanation of isolation
  1192. flags. (Default: 0)
  1193. [[DNSListenAddress]] **DNSListenAddress** __IP__[:__PORT__]::
  1194. Bind to this address to listen for DNS connections. (DEPRECATED: As of
  1195. 0.2.3.x-alpha, you can now use multiple DNSPort entries, and provide
  1196. addresses for DNSPort entries, so DNSListenAddress no longer has a
  1197. purpose. For backward compatibility, DNSListenAddress is only allowed
  1198. when DNSPort is just a port number.)
  1199. [[ClientDNSRejectInternalAddresses]] **ClientDNSRejectInternalAddresses** **0**|**1**::
  1200. If true, Tor does not believe any anonymously retrieved DNS answer that
  1201. tells it that an address resolves to an internal address (like 127.0.0.1 or
  1202. 192.168.0.1). This option prevents certain browser-based attacks; don't
  1203. turn it off unless you know what you're doing. (Default: 1)
  1204. [[ClientRejectInternalAddresses]] **ClientRejectInternalAddresses** **0**|**1**::
  1205. If true, Tor does not try to fulfill requests to connect to an internal
  1206. address (like 127.0.0.1 or 192.168.0.1) __unless a exit node is
  1207. specifically requested__ (for example, via a .exit hostname, or a
  1208. controller request). (Default: 1)
  1209. [[DownloadExtraInfo]] **DownloadExtraInfo** **0**|**1**::
  1210. If true, Tor downloads and caches "extra-info" documents. These documents
  1211. contain information about servers other than the information in their
  1212. regular server descriptors. Tor does not use this information for anything
  1213. itself; to save bandwidth, leave this option turned off. (Default: 0)
  1214. [[WarnPlaintextPorts]] **WarnPlaintextPorts** __port__,__port__,__...__::
  1215. Tells Tor to issue a warnings whenever the user tries to make an anonymous
  1216. connection to one of these ports. This option is designed to alert users
  1217. to services that risk sending passwords in the clear. (Default:
  1218. 23,109,110,143)
  1219. [[RejectPlaintextPorts]] **RejectPlaintextPorts** __port__,__port__,__...__::
  1220. Like WarnPlaintextPorts, but instead of warning about risky port uses, Tor
  1221. will instead refuse to make the connection. (Default: None)
  1222. [[AllowSingleHopCircuits]] **AllowSingleHopCircuits** **0**|**1**::
  1223. When this option is set, the attached Tor controller can use relays
  1224. that have the **AllowSingleHopExits** option turned on to build
  1225. one-hop Tor connections. (Default: 0)
  1226. [[OptimisticData]] **OptimisticData** **0**|**1**|**auto**::
  1227. When this option is set, and Tor is using an exit node that supports
  1228. the feature, it will try optimistically to send data to the exit node
  1229. without waiting for the exit node to report whether the connection
  1230. succeeded. This can save a round-trip time for protocols like HTTP
  1231. where the client talks first. If OptimisticData is set to **auto**,
  1232. Tor will look at the UseOptimisticData parameter in the networkstatus.
  1233. (Default: auto)
  1234. [[Tor2webMode]] **Tor2webMode** **0**|**1**::
  1235. When this option is set, Tor connects to hidden services
  1236. **non-anonymously**. This option also disables client connections to
  1237. non-hidden-service hostnames through Tor. It **must only** be used when
  1238. running a tor2web Hidden Service web proxy.
  1239. To enable this option the compile time flag --enable-tor2webmode must be
  1240. specified. (Default: 0)
  1241. [[Tor2webRendezvousPoints]] **Tor2webRendezvousPoints** __node__,__node__,__...__::
  1242. A list of identity fingerprints, nicknames, country codes and
  1243. address patterns of nodes that are allowed to be used as RPs
  1244. in HS circuits; any other nodes will not be used as RPs.
  1245. (Example:
  1246. Tor2webRendezvousPoints Fastyfasty, ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
  1247. +
  1248. This feature can only be used if Tor2webMode is also enabled.
  1249. +
  1250. ExcludeNodes have higher priority than Tor2webRendezvousPoints,
  1251. which means that nodes specified in ExcludeNodes will not be
  1252. picked as RPs.
  1253. +
  1254. If no nodes in Tor2webRendezvousPoints are currently available for
  1255. use, Tor will choose a random node when building HS circuits.
  1256. [[UseMicrodescriptors]] **UseMicrodescriptors** **0**|**1**|**auto**::
  1257. Microdescriptors are a smaller version of the information that Tor needs
  1258. in order to build its circuits. Using microdescriptors makes Tor clients
  1259. download less directory information, thus saving bandwidth. Directory
  1260. caches need to fetch regular descriptors and microdescriptors, so this
  1261. option doesn't save any bandwidth for them. If this option is set to
  1262. "auto" (recommended) then it is on for all clients that do not set
  1263. FetchUselessDescriptors. (Default: auto)
  1264. [[UseNTorHandshake]] **UseNTorHandshake** **0**|**1**|**auto**::
  1265. The "ntor" circuit-creation handshake is faster and (we think) more
  1266. secure than the original ("TAP") circuit handshake, but starting to use
  1267. it too early might make your client stand out. If this option is 0, your
  1268. Tor client won't use the ntor handshake. If it's 1, your Tor client
  1269. will use the ntor handshake to extend circuits through servers that
  1270. support it. If this option is "auto", then your client
  1271. will use the ntor handshake once enough directory authorities recommend
  1272. it. (Default: 1)
  1273. [[PathBiasCircThreshold]] **PathBiasCircThreshold** __NUM__ +
  1274. [[PathBiasNoticeRate]] **PathBiasNoticeRate** __NUM__ +
  1275. [[PathBiasWarnRate]] **PathBiasWarnRate** __NUM__ +
  1276. [[PathBiasExtremeRate]] **PathBiasExtremeRate** __NUM__ +
  1277. [[PathBiasDropGuards]] **PathBiasDropGuards** __NUM__ +
  1278. [[PathBiasScaleThreshold]] **PathBiasScaleThreshold** __NUM__::
  1279. These options override the default behavior of Tor's (**currently
  1280. experimental**) path bias detection algorithm. To try to find broken or
  1281. misbehaving guard nodes, Tor looks for nodes where more than a certain
  1282. fraction of circuits through that guard fail to get built.
  1283. +
  1284. The PathBiasCircThreshold option controls how many circuits we need to build
  1285. through a guard before we make these checks. The PathBiasNoticeRate,
  1286. PathBiasWarnRate and PathBiasExtremeRate options control what fraction of
  1287. circuits must succeed through a guard so we won't write log messages.
  1288. If less than PathBiasExtremeRate circuits succeed *and* PathBiasDropGuards
  1289. is set to 1, we disable use of that guard. +
  1290. +
  1291. When we have seen more than PathBiasScaleThreshold
  1292. circuits through a guard, we scale our observations by 0.5 (governed by
  1293. the consensus) so that new observations don't get swamped by old ones. +
  1294. +
  1295. By default, or if a negative value is provided for one of these options,
  1296. Tor uses reasonable defaults from the networkstatus consensus document.
  1297. If no defaults are available there, these options default to 150, .70,
  1298. .50, .30, 0, and 300 respectively.
  1299. [[PathBiasUseThreshold]] **PathBiasUseThreshold** __NUM__ +
  1300. [[PathBiasNoticeUseRate]] **PathBiasNoticeUseRate** __NUM__ +
  1301. [[PathBiasExtremeUseRate]] **PathBiasExtremeUseRate** __NUM__ +
  1302. [[PathBiasScaleUseThreshold]] **PathBiasScaleUseThreshold** __NUM__::
  1303. Similar to the above options, these options override the default behavior
  1304. of Tor's (**currently experimental**) path use bias detection algorithm.
  1305. +
  1306. Where as the path bias parameters govern thresholds for successfully
  1307. building circuits, these four path use bias parameters govern thresholds
  1308. only for circuit usage. Circuits which receive no stream usage
  1309. are not counted by this detection algorithm. A used circuit is considered
  1310. successful if it is capable of carrying streams or otherwise receiving
  1311. well-formed responses to RELAY cells.
  1312. +
  1313. By default, or if a negative value is provided for one of these options,
  1314. Tor uses reasonable defaults from the networkstatus consensus document.
  1315. If no defaults are available there, these options default to 20, .80,
  1316. .60, and 100, respectively.
  1317. [[ClientUseIPv4]] **ClientUseIPv4** **0**|**1**::
  1318. If this option is set to 0, Tor will avoid connecting to directory servers
  1319. and entry nodes over IPv4. Note that clients with an IPv4
  1320. address in a **Bridge**, proxy, or pluggable transport line will try
  1321. connecting over IPv4 even if **ClientUseIPv4** is set to 0. (Default: 1)
  1322. [[ClientUseIPv6]] **ClientUseIPv6** **0**|**1**::
  1323. If this option is set to 1, Tor might connect to directory servers or
  1324. entry nodes over IPv6. Note that clients configured with an IPv6 address
  1325. in a **Bridge**, proxy, or pluggable transport line will try connecting
  1326. over IPv6 even if **ClientUseIPv6** is set to 0. (Default: 0)
  1327. [[ClientPreferIPv6DirPort]] **ClientPreferIPv6DirPort** **0**|**1**|**auto**::
  1328. If this option is set to 1, Tor prefers a directory port with an IPv6
  1329. address over one with IPv4, for direct connections, if a given directory
  1330. server has both. (Tor also prefers an IPv6 DirPort if IPv4Client is set to
  1331. 0.) If this option is set to auto, clients prefer IPv4. Other things may
  1332. influence the choice. This option breaks a tie to the favor of IPv6.
  1333. (Default: auto)
  1334. [[ClientPreferIPv6ORPort]] **ClientPreferIPv6ORPort** **0**|**1**|**auto**::
  1335. If this option is set to 1, Tor prefers an OR port with an IPv6
  1336. address over one with IPv4 if a given entry node has both. (Tor also
  1337. prefers an IPv6 ORPort if IPv4Client is set to 0.) If this option is set
  1338. to auto, Tor bridge clients prefer the configured bridge address, and
  1339. other clients prefer IPv4. Other things may influence the choice. This
  1340. option breaks a tie to the favor of IPv6. (Default: auto)
  1341. [[PathsNeededToBuildCircuits]] **PathsNeededToBuildCircuits** __NUM__::
  1342. Tor clients don't build circuits for user traffic until they know
  1343. about enough of the network so that they could potentially construct
  1344. enough of the possible paths through the network. If this option
  1345. is set to a fraction between 0.25 and 0.95, Tor won't build circuits
  1346. until it has enough descriptors or microdescriptors to construct
  1347. that fraction of possible paths. Note that setting this option too low
  1348. can make your Tor client less anonymous, and setting it too high can
  1349. prevent your Tor client from bootstrapping. If this option is negative,
  1350. Tor will use a default value chosen by the directory
  1351. authorities. (Default: -1.)
  1352. [[ClientBootstrapConsensusAuthorityDownloadSchedule]] **ClientBootstrapConsensusAuthorityDownloadSchedule** __N__,__N__,__...__::
  1353. Schedule for when clients should download consensuses from authorities
  1354. if they are bootstrapping (that is, they don't have a usable, reasonably
  1355. live consensus). Only used by clients fetching from a list of fallback
  1356. directory mirrors. This schedule is advanced by (potentially concurrent)
  1357. connection attempts, unlike other schedules, which are advanced by
  1358. connection failures. (Default: 10, 11, 3600, 10800, 25200, 54000,
  1359. 111600, 262800)
  1360. [[ClientBootstrapConsensusFallbackDownloadSchedule]] **ClientBootstrapConsensusFallbackDownloadSchedule** __N__,__N__,__...__::
  1361. Schedule for when clients should download consensuses from fallback
  1362. directory mirrors if they are bootstrapping (that is, they don't have a
  1363. usable, reasonably live consensus). Only used by clients fetching from a
  1364. list of fallback directory mirrors. This schedule is advanced by
  1365. (potentially concurrent) connection attempts, unlike other schedules,
  1366. which are advanced by connection failures. (Default: 0, 1, 4, 11, 3600,
  1367. 10800, 25200, 54000, 111600, 262800)
  1368. [[ClientBootstrapConsensusAuthorityOnlyDownloadSchedule]] **ClientBootstrapConsensusAuthorityOnlyDownloadSchedule** __N__,__N__,__...__::
  1369. Schedule for when clients should download consensuses from authorities
  1370. if they are bootstrapping (that is, they don't have a usable, reasonably
  1371. live consensus). Only used by clients which don't have or won't fetch
  1372. from a list of fallback directory mirrors. This schedule is advanced by
  1373. (potentially concurrent) connection attempts, unlike other schedules,
  1374. which are advanced by connection failures. (Default: 0, 3, 7, 3600,
  1375. 10800, 25200, 54000, 111600, 262800)
  1376. [[ClientBootstrapConsensusMaxDownloadTries]] **ClientBootstrapConsensusMaxDownloadTries** __NUM__::
  1377. Try this many times to download a consensus while bootstrapping using
  1378. fallback directory mirrors before giving up. (Default: 7)
  1379. [[ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries]] **ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries** __NUM__::
  1380. Try this many times to download a consensus while bootstrapping using
  1381. authorities before giving up. (Default: 4)
  1382. [[ClientBootstrapConsensusMaxInProgressTries]] **ClientBootstrapConsensusMaxInProgressTries** __NUM__::
  1383. Try this many simultaneous connections to download a consensus before
  1384. waiting for one to complete, timeout, or error out. (Default: 4)
  1385. SERVER OPTIONS
  1386. --------------
  1387. The following options are useful only for servers (that is, if ORPort
  1388. is non-zero):
  1389. [[Address]] **Address** __address__::
  1390. The IP address or fully qualified domain name of this server (e.g.
  1391. moria.mit.edu). You can leave this unset, and Tor will guess your IP
  1392. address. This IP address is the one used to tell clients and other
  1393. servers where to find your Tor server; it doesn't affect the IP that your
  1394. Tor client binds to. To bind to a different address, use the
  1395. *ListenAddress and OutboundBindAddress options.
  1396. [[AllowSingleHopExits]] **AllowSingleHopExits** **0**|**1**::
  1397. This option controls whether clients can use this server as a single hop
  1398. proxy. If set to 1, clients can use this server as an exit even if it is
  1399. the only hop in the circuit. Note that most clients will refuse to use
  1400. servers that set this option, since most clients have
  1401. ExcludeSingleHopRelays set. (Default: 0)
  1402. [[AssumeReachable]] **AssumeReachable** **0**|**1**::
  1403. This option is used when bootstrapping a new Tor network. If set to 1,
  1404. don't do self-reachability testing; just upload your server descriptor
  1405. immediately. If **AuthoritativeDirectory** is also set, this option
  1406. instructs the dirserver to bypass remote reachability testing too and list
  1407. all connected servers as running.
  1408. [[BridgeRelay]] **BridgeRelay** **0**|**1**::
  1409. Sets the relay to act as a "bridge" with respect to relaying connections
  1410. from bridge users to the Tor network. It mainly causes Tor to publish a
  1411. server descriptor to the bridge database, rather than
  1412. to the public directory authorities.
  1413. [[ContactInfo]] **ContactInfo** __email_address__::
  1414. Administrative contact information for this relay or bridge. This line
  1415. can be used to contact you if your relay or bridge is misconfigured or
  1416. something else goes wrong. Note that we archive and publish all
  1417. descriptors containing these lines and that Google indexes them, so
  1418. spammers might also collect them. You may want to obscure the fact
  1419. that it's an email address and/or generate a new address for this
  1420. purpose.
  1421. [[ExitRelay]] **ExitRelay** **0**|**1**|**auto**::
  1422. Tells Tor whether to run as an exit relay. If Tor is running as a
  1423. non-bridge server, and ExitRelay is set to 1, then Tor allows traffic to
  1424. exit according to the ExitPolicy option (or the default ExitPolicy if
  1425. none is specified).
  1426. +
  1427. If ExitRelay is set to 0, no traffic is allowed to
  1428. exit, and the ExitPolicy option is ignored. +
  1429. +
  1430. If ExitRelay is set to "auto", then Tor behaves as if it were set to 1, but
  1431. warns the user if this would cause traffic to exit. In a future version,
  1432. the default value will be 0. (Default: auto)
  1433. [[ExitPolicy]] **ExitPolicy** __policy__,__policy__,__...__::
  1434. Set an exit policy for this server. Each policy is of the form
  1435. "**accept[6]**|**reject[6]** __ADDR__[/__MASK__][:__PORT__]". If /__MASK__ is
  1436. omitted then this policy just applies to the host given. Instead of giving
  1437. a host or network you can also use "\*" to denote the universe (0.0.0.0/0
  1438. and ::/128), or \*4 to denote all IPv4 addresses, and \*6 to denote all
  1439. IPv6 addresses.
  1440. __PORT__ can be a single port number, an interval of ports
  1441. "__FROM_PORT__-__TO_PORT__", or "\*". If __PORT__ is omitted, that means
  1442. "\*". +
  1443. +
  1444. For example, "accept 18.7.22.69:\*,reject 18.0.0.0/8:\*,accept \*:\*" would
  1445. reject any IPv4 traffic destined for MIT except for web.mit.edu, and accept
  1446. any other IPv4 or IPv6 traffic. +
  1447. +
  1448. Tor also allows IPv6 exit policy entries. For instance, "reject6 [FC00::]/7:\*"
  1449. rejects all destinations that share 7 most significant bit prefix with
  1450. address FC00::. Respectively, "accept6 [C000::]/3:\*" accepts all destinations
  1451. that share 3 most significant bit prefix with address C000::. +
  1452. +
  1453. accept6 and reject6 only produce IPv6 exit policy entries. Using an IPv4
  1454. address with accept6 or reject6 is ignored and generates a warning.
  1455. accept/reject allows either IPv4 or IPv6 addresses. Use \*4 as an IPv4
  1456. wildcard address, and \*6 as an IPv6 wildcard address. accept/reject *
  1457. expands to matching IPv4 and IPv6 wildcard address rules. +
  1458. +
  1459. To specify all IPv4 and IPv6 internal and link-local networks (including
  1460. 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8,
  1461. 172.16.0.0/12, [::]/8, [FC00::]/7, [FE80::]/10, [FEC0::]/10, [FF00::]/8,
  1462. and [::]/127), you can use the "private" alias instead of an address.
  1463. ("private" always produces rules for IPv4 and IPv6 addresses, even when
  1464. used with accept6/reject6.) +
  1465. +
  1466. Private addresses are rejected by default (at the beginning of your exit
  1467. policy), along with any configured primary public IPv4 and IPv6 addresses,
  1468. and any public IPv4 and IPv6 addresses on any interface on the relay.
  1469. These private addresses are rejected unless you set the
  1470. ExitPolicyRejectPrivate config option to 0. For example, once you've done
  1471. that, you could allow HTTP to 127.0.0.1 and block all other connections to
  1472. internal networks with "accept 127.0.0.1:80,reject private:\*", though that
  1473. may also allow connections to your own computer that are addressed to its
  1474. public (external) IP address. See RFC 1918 and RFC 3330 for more details
  1475. about internal and reserved IP address space. +
  1476. +
  1477. This directive can be specified multiple times so you don't have to put it
  1478. all on one line. +
  1479. +
  1480. Policies are considered first to last, and the first match wins. If you
  1481. want to allow the same ports on IPv4 and IPv6, write your rules using
  1482. accept/reject \*. If you want to allow different ports on IPv4 and IPv6,
  1483. write your IPv6 rules using accept6/reject6 \*6, and your IPv4 rules using
  1484. accept/reject \*4. If you want to \_replace_ the default exit policy, end
  1485. your exit policy with either a reject \*:* or an accept \*:*. Otherwise,
  1486. you're \_augmenting_ (prepending to) the default exit policy. The default
  1487. exit policy is: +
  1488. reject *:25
  1489. reject *:119
  1490. reject *:135-139
  1491. reject *:445
  1492. reject *:563
  1493. reject *:1214
  1494. reject *:4661-4666
  1495. reject *:6346-6429
  1496. reject *:6699
  1497. reject *:6881-6999
  1498. accept *:*
  1499. Since the default exit policy uses accept/reject *, it applies to both
  1500. IPv4 and IPv6 addresses.
  1501. [[ExitPolicyRejectPrivate]] **ExitPolicyRejectPrivate** **0**|**1**::
  1502. Reject all private (local) networks, along with any configured public
  1503. IPv4 and IPv6 addresses, at the beginning of your exit policy. (This
  1504. includes the IPv4 and IPv6 addresses advertised by the relay, any
  1505. OutboundBindAddress, and the bind addresses of any port options, such as
  1506. ORPort and DirPort.) This also rejects any public IPv4 and IPv6 addresses
  1507. on any interface on the relay. (If IPv6Exit is not set, all IPv6 addresses
  1508. will be rejected anyway.)
  1509. See above entry on ExitPolicy.
  1510. (Default: 1)
  1511. [[IPv6Exit]] **IPv6Exit** **0**|**1**::
  1512. If set, and we are an exit node, allow clients to use us for IPv6
  1513. traffic. (Default: 0)
  1514. [[MaxOnionQueueDelay]] **MaxOnionQueueDelay** __NUM__ [**msec**|**second**]::
  1515. If we have more onionskins queued for processing than we can process in
  1516. this amount of time, reject new ones. (Default: 1750 msec)
  1517. [[MyFamily]] **MyFamily** __node__,__node__,__...__::
  1518. Declare that this Tor server is controlled or administered by a group or
  1519. organization identical or similar to that of the other servers, defined by
  1520. their identity fingerprints. When two servers both declare
  1521. that they are in the same \'family', Tor clients will not use them in the
  1522. same circuit. (Each server only needs to list the other servers in its
  1523. family; it doesn't need to list itself, but it won't hurt.) Do not list
  1524. any bridge relay as it would compromise its concealment.
  1525. +
  1526. When listing a node, it's better to list it by fingerprint than by
  1527. nickname: fingerprints are more reliable.
  1528. [[Nickname]] **Nickname** __name__::
  1529. Set the server's nickname to \'name'. Nicknames must be between 1 and 19
  1530. characters inclusive, and must contain only the characters [a-zA-Z0-9].
  1531. [[NumCPUs]] **NumCPUs** __num__::
  1532. How many processes to use at once for decrypting onionskins and other
  1533. parallelizable operations. If this is set to 0, Tor will try to detect
  1534. how many CPUs you have, defaulting to 1 if it can't tell. (Default: 0)
  1535. [[ORPort]] **ORPort** \['address':]__PORT__|**auto** [_flags_]::
  1536. Advertise this port to listen for connections from Tor clients and
  1537. servers. This option is required to be a Tor server.
  1538. Set it to "auto" to have Tor pick a port for you. Set it to 0 to not
  1539. run an ORPort at all. This option can occur more than once. (Default: 0)
  1540. +
  1541. Tor recognizes these flags on each ORPort:
  1542. **NoAdvertise**::
  1543. By default, we bind to a port and tell our users about it. If
  1544. NoAdvertise is specified, we don't advertise, but listen anyway. This
  1545. can be useful if the port everybody will be connecting to (for
  1546. example, one that's opened on our firewall) is somewhere else.
  1547. **NoListen**::
  1548. By default, we bind to a port and tell our users about it. If
  1549. NoListen is specified, we don't bind, but advertise anyway. This
  1550. can be useful if something else (for example, a firewall's port
  1551. forwarding configuration) is causing connections to reach us.
  1552. **IPv4Only**::
  1553. If the address is absent, or resolves to both an IPv4 and an IPv6
  1554. address, only listen to the IPv4 address.
  1555. **IPv6Only**::
  1556. If the address is absent, or resolves to both an IPv4 and an IPv6
  1557. address, only listen to the IPv6 address.
  1558. +
  1559. For obvious reasons, NoAdvertise and NoListen are mutually exclusive, and
  1560. IPv4Only and IPv6Only are mutually exclusive.
  1561. [[ORListenAddress]] **ORListenAddress** __IP__[:__PORT__]::
  1562. Bind to this IP address to listen for connections from Tor clients and
  1563. servers. If you specify a port, bind to this port rather than the one
  1564. specified in ORPort. (Default: 0.0.0.0) This directive can be specified
  1565. multiple times to bind to multiple addresses/ports.
  1566. +
  1567. This option is deprecated; you can get the same behavior with ORPort now
  1568. that it supports NoAdvertise and explicit addresses.
  1569. [[PortForwarding]] **PortForwarding** **0**|**1**::
  1570. Attempt to automatically forward the DirPort and ORPort on a NAT router
  1571. connecting this Tor server to the Internet. If set, Tor will try both
  1572. NAT-PMP (common on Apple routers) and UPnP (common on routers from other
  1573. manufacturers). (Default: 0)
  1574. [[PortForwardingHelper]] **PortForwardingHelper** __filename__|__pathname__::
  1575. If PortForwarding is set, use this executable to configure the forwarding.
  1576. If set to a filename, the system path will be searched for the executable.
  1577. If set to a path, only the specified path will be executed.
  1578. (Default: tor-fw-helper)
  1579. [[PublishServerDescriptor]] **PublishServerDescriptor** **0**|**1**|**v3**|**bridge**,**...**::
  1580. This option specifies which descriptors Tor will publish when acting as
  1581. a relay. You can
  1582. choose multiple arguments, separated by commas.
  1583. +
  1584. If this option is set to 0, Tor will not publish its
  1585. descriptors to any directories. (This is useful if you're testing
  1586. out your server, or if you're using a Tor controller that handles directory
  1587. publishing for you.) Otherwise, Tor will publish its descriptors of all
  1588. type(s) specified. The default is "1",
  1589. which means "if running as a server, publish the
  1590. appropriate descriptors to the authorities".
  1591. [[ShutdownWaitLength]] **ShutdownWaitLength** __NUM__::
  1592. When we get a SIGINT and we're a server, we begin shutting down:
  1593. we close listeners and start refusing new circuits. After **NUM**
  1594. seconds, we exit. If we get a second SIGINT, we exit immediately.
  1595. (Default: 30 seconds)
  1596. [[SSLKeyLifetime]] **SSLKeyLifetime** __N__ **minutes**|**hours**|**days**|**weeks**::
  1597. When creating a link certificate for our outermost SSL handshake,
  1598. set its lifetime to this amount of time. If set to 0, Tor will choose
  1599. some reasonable random defaults. (Default: 0)
  1600. [[HeartbeatPeriod]] **HeartbeatPeriod** __N__ **minutes**|**hours**|**days**|**weeks**::
  1601. Log a heartbeat message every **HeartbeatPeriod** seconds. This is
  1602. a log level __notice__ message, designed to let you know your Tor
  1603. server is still alive and doing useful things. Settings this
  1604. to 0 will disable the heartbeat. Otherwise, it must be at least 30
  1605. minutes. (Default: 6 hours)
  1606. [[AccountingMax]] **AccountingMax** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**|**TBytes**::
  1607. Limits the max number of bytes sent and received within a set time period
  1608. using a given calculation rule (see: AccountingStart, AccountingRule).
  1609. Useful if you need to stay under a specific bandwidth. By default, the
  1610. number used for calculation is the max of either the bytes sent or
  1611. received. For example, with AccountingMax set to 1 GByte, a server
  1612. could send 900 MBytes and receive 800 MBytes and continue running.
  1613. It will only hibernate once one of the two reaches 1 GByte. This can
  1614. be changed to use the sum of the both bytes received and sent by setting
  1615. the AccountingRule option to "sum" (total bandwidth in/out). When the
  1616. number of bytes remaining gets low, Tor will stop accepting new connections
  1617. and circuits. When the number of bytes is exhausted, Tor will hibernate
  1618. until some time in the next accounting period. To prevent all servers
  1619. from waking at the same time, Tor will also wait until a random point
  1620. in each period before waking up. If you have bandwidth cost issues,
  1621. enabling hibernation is preferable to setting a low bandwidth, since
  1622. it provides users with a collection of fast servers that are up some
  1623. of the time, which is more useful than a set of slow servers that are
  1624. always "available".
  1625. [[AccountingRule]] **AccountingRule** **sum**|**max**|**in**|**out**::
  1626. How we determine when our AccountingMax has been reached (when we
  1627. should hibernate) during a time interval. Set to "max" to calculate
  1628. using the higher of either the sent or received bytes (this is the
  1629. default functionality). Set to "sum" to calculate using the sent
  1630. plus received bytes. Set to "in" to calculate using only the
  1631. received bytes. Set to "out" to calculate using only the sent bytes.
  1632. (Default: max)
  1633. [[AccountingStart]] **AccountingStart** **day**|**week**|**month** [__day__] __HH:MM__::
  1634. Specify how long accounting periods last. If **month** is given, each
  1635. accounting period runs from the time __HH:MM__ on the __dayth__ day of one
  1636. month to the same day and time of the next. (The day must be between 1 and
  1637. 28.) If **week** is given, each accounting period runs from the time __HH:MM__
  1638. of the __dayth__ day of one week to the same day and time of the next week,
  1639. with Monday as day 1 and Sunday as day 7. If **day** is given, each
  1640. accounting period runs from the time __HH:MM__ each day to the same time on
  1641. the next day. All times are local, and given in 24-hour time. (Default:
  1642. "month 1 0:00")
  1643. [[RefuseUnknownExits]] **RefuseUnknownExits** **0**|**1**|**auto**::
  1644. Prevent nodes that don't appear in the consensus from exiting using this
  1645. relay. If the option is 1, we always block exit attempts from such
  1646. nodes; if it's 0, we never do, and if the option is "auto", then we do
  1647. whatever the authorities suggest in the consensus (and block if the consensus
  1648. is quiet on the issue). (Default: auto)
  1649. [[ServerDNSResolvConfFile]] **ServerDNSResolvConfFile** __filename__::
  1650. Overrides the default DNS configuration with the configuration in
  1651. __filename__. The file format is the same as the standard Unix
  1652. "**resolv.conf**" file (7). This option, like all other ServerDNS options,
  1653. only affects name lookups that your server does on behalf of clients.
  1654. (Defaults to use the system DNS configuration.)
  1655. [[ServerDNSAllowBrokenConfig]] **ServerDNSAllowBrokenConfig** **0**|**1**::
  1656. If this option is false, Tor exits immediately if there are problems
  1657. parsing the system DNS configuration or connecting to nameservers.
  1658. Otherwise, Tor continues to periodically retry the system nameservers until
  1659. it eventually succeeds. (Default: 1)
  1660. [[ServerDNSSearchDomains]] **ServerDNSSearchDomains** **0**|**1**::
  1661. If set to 1, then we will search for addresses in the local search domain.
  1662. For example, if this system is configured to believe it is in
  1663. "example.com", and a client tries to connect to "www", the client will be
  1664. connected to "www.example.com". This option only affects name lookups that
  1665. your server does on behalf of clients. (Default: 0)
  1666. [[ServerDNSDetectHijacking]] **ServerDNSDetectHijacking** **0**|**1**::
  1667. When this option is set to 1, we will test periodically to determine
  1668. whether our local nameservers have been configured to hijack failing DNS
  1669. requests (usually to an advertising site). If they are, we will attempt to
  1670. correct this. This option only affects name lookups that your server does
  1671. on behalf of clients. (Default: 1)
  1672. [[ServerDNSTestAddresses]] **ServerDNSTestAddresses** __address__,__address__,__...__::
  1673. When we're detecting DNS hijacking, make sure that these __valid__ addresses
  1674. aren't getting redirected. If they are, then our DNS is completely useless,
  1675. and we'll reset our exit policy to "reject \*:*". This option only affects
  1676. name lookups that your server does on behalf of clients. (Default:
  1677. "www.google.com, www.mit.edu, www.yahoo.com, www.slashdot.org")
  1678. [[ServerDNSAllowNonRFC953Hostnames]] **ServerDNSAllowNonRFC953Hostnames** **0**|**1**::
  1679. When this option is disabled, Tor does not try to resolve hostnames
  1680. containing illegal characters (like @ and :) rather than sending them to an
  1681. exit node to be resolved. This helps trap accidental attempts to resolve
  1682. URLs and so on. This option only affects name lookups that your server does
  1683. on behalf of clients. (Default: 0)
  1684. [[BridgeRecordUsageByCountry]] **BridgeRecordUsageByCountry** **0**|**1**::
  1685. When this option is enabled and BridgeRelay is also enabled, and we have
  1686. GeoIP data, Tor keeps a per-country count of how many client
  1687. addresses have contacted it so that it can help the bridge authority guess
  1688. which countries have blocked access to it. (Default: 1)
  1689. [[ServerDNSRandomizeCase]] **ServerDNSRandomizeCase** **0**|**1**::
  1690. When this option is set, Tor sets the case of each character randomly in
  1691. outgoing DNS requests, and makes sure that the case matches in DNS replies.
  1692. This so-called "0x20 hack" helps resist some types of DNS poisoning attack.
  1693. For more information, see "Increased DNS Forgery Resistance through
  1694. 0x20-Bit Encoding". This option only affects name lookups that your server
  1695. does on behalf of clients. (Default: 1)
  1696. [[GeoIPFile]] **GeoIPFile** __filename__::
  1697. A filename containing IPv4 GeoIP data, for use with by-country statistics.
  1698. [[GeoIPv6File]] **GeoIPv6File** __filename__::
  1699. A filename containing IPv6 GeoIP data, for use with by-country statistics.
  1700. [[TLSECGroup]] **TLSECGroup** **P224**|**P256**::
  1701. What EC group should we try to use for incoming TLS connections?
  1702. P224 is faster, but makes us stand out more. Has no effect if
  1703. we're a client, or if our OpenSSL version lacks support for ECDHE.
  1704. (Default: P256)
  1705. [[CellStatistics]] **CellStatistics** **0**|**1**::
  1706. Relays only.
  1707. When this option is enabled, Tor collects statistics about cell
  1708. processing (i.e. mean time a cell is spending in a queue, mean
  1709. number of cells in a queue and mean number of processed cells per
  1710. circuit) and writes them into disk every 24 hours. Onion router
  1711. operators may use the statistics for performance monitoring.
  1712. If ExtraInfoStatistics is enabled, it will published as part of
  1713. extra-info document. (Default: 0)
  1714. [[DirReqStatistics]] **DirReqStatistics** **0**|**1**::
  1715. Relays and bridges only.
  1716. When this option is enabled, a Tor directory writes statistics on the
  1717. number and response time of network status requests to disk every 24
  1718. hours. Enables relay and bridge operators to monitor how much their
  1719. server is being used by clients to learn about Tor network.
  1720. If ExtraInfoStatistics is enabled, it will published as part of
  1721. extra-info document. (Default: 1)
  1722. [[EntryStatistics]] **EntryStatistics** **0**|**1**::
  1723. Relays only.
  1724. When this option is enabled, Tor writes statistics on the number of
  1725. directly connecting clients to disk every 24 hours. Enables relay
  1726. operators to monitor how much inbound traffic that originates from
  1727. Tor clients passes through their server to go further down the
  1728. Tor network. If ExtraInfoStatistics is enabled, it will be published
  1729. as part of extra-info document. (Default: 0)
  1730. [[ExitPortStatistics]] **ExitPortStatistics** **0**|**1**::
  1731. Exit relays only.
  1732. When this option is enabled, Tor writes statistics on the number of
  1733. relayed bytes and opened stream per exit port to disk every 24 hours.
  1734. Enables exit relay operators to measure and monitor amounts of traffic
  1735. that leaves Tor network through their exit node. If ExtraInfoStatistics
  1736. is enabled, it will be published as part of extra-info document.
  1737. (Default: 0)
  1738. [[ConnDirectionStatistics]] **ConnDirectionStatistics** **0**|**1**::
  1739. Relays only.
  1740. When this option is enabled, Tor writes statistics on the amounts of
  1741. traffic it passes between itself and other relays to disk every 24
  1742. hours. Enables relay operators to monitor how much their relay is
  1743. being used as middle node in the circuit. If ExtraInfoStatistics is
  1744. enabled, it will be published as part of extra-info document.
  1745. (Default: 0)
  1746. [[HiddenServiceStatistics]] **HiddenServiceStatistics** **0**|**1**::
  1747. Relays only.
  1748. When this option is enabled, a Tor relay writes obfuscated
  1749. statistics on its role as hidden-service directory, introduction
  1750. point, or rendezvous point to disk every 24 hours. If
  1751. ExtraInfoStatistics is also enabled, these statistics are further
  1752. published to the directory authorities. (Default: 1)
  1753. [[ExtraInfoStatistics]] **ExtraInfoStatistics** **0**|**1**::
  1754. When this option is enabled, Tor includes previously gathered statistics in
  1755. its extra-info documents that it uploads to the directory authorities.
  1756. (Default: 1)
  1757. [[ExtendAllowPrivateAddresses]] **ExtendAllowPrivateAddresses** **0**|**1**::
  1758. When this option is enabled, Tor will connect to relays on localhost,
  1759. RFC1918 addresses, and so on. In particular, Tor will make direct OR
  1760. connections, and Tor routers allow EXTEND requests, to these private
  1761. addresses. (Tor will always allow connections to bridges, proxies, and
  1762. pluggable transports configured on private addresses.) Enabling this
  1763. option can create security issues; you should probably leave it off.
  1764. (Default: 0)
  1765. [[MaxMemInQueues]] **MaxMemInQueues** __N__ **bytes**|**KB**|**MB**|**GB**::
  1766. This option configures a threshold above which Tor will assume that it
  1767. needs to stop queueing or buffering data because it's about to run out of
  1768. memory. If it hits this threshold, it will begin killing circuits until
  1769. it has recovered at least 10% of this memory. Do not set this option too
  1770. low, or your relay may be unreliable under load. This option only
  1771. affects some queues, so the actual process size will be larger than
  1772. this. If this option is set to 0, Tor will try to pick a reasonable
  1773. default based on your system's physical memory. (Default: 0)
  1774. [[SigningKeyLifetime]] **SigningKeyLifetime** __N__ **days**|**weeks**|**months**::
  1775. For how long should each Ed25519 signing key be valid? Tor uses a
  1776. permanent master identity key that can be kept offline, and periodically
  1777. generates new "signing" keys that it uses online. This option
  1778. configures their lifetime.
  1779. (Default: 30 days)
  1780. [[OfflineMasterKey]] **OfflineMasterKey** **0**|**1**::
  1781. If non-zero, the Tor relay will never generate or load its master secret
  1782. key. Instead, you'll have to use "tor --keygen" to manage the permanent
  1783. ed25519 master identity key, as well as the corresponding temporary
  1784. signing keys and certificates. (Default: 0)
  1785. DIRECTORY SERVER OPTIONS
  1786. ------------------------
  1787. The following options are useful only for directory servers (that is,
  1788. if DirPort is non-zero):
  1789. [[DirPortFrontPage]] **DirPortFrontPage** __FILENAME__::
  1790. When this option is set, it takes an HTML file and publishes it as "/" on
  1791. the DirPort. Now relay operators can provide a disclaimer without needing
  1792. to set up a separate webserver. There's a sample disclaimer in
  1793. contrib/operator-tools/tor-exit-notice.html.
  1794. [[DirPort]] **DirPort** \['address':]__PORT__|**auto** [_flags_]::
  1795. If this option is nonzero, advertise the directory service on this port.
  1796. Set it to "auto" to have Tor pick a port for you. This option can occur
  1797. more than once, but only one advertised DirPort is supported: all
  1798. but one DirPort must have the **NoAdvertise** flag set. (Default: 0)
  1799. +
  1800. The same flags are supported here as are supported by ORPort.
  1801. [[DirListenAddress]] **DirListenAddress** __IP__[:__PORT__]::
  1802. Bind the directory service to this address. If you specify a port, bind to
  1803. this port rather than the one specified in DirPort. (Default: 0.0.0.0)
  1804. This directive can be specified multiple times to bind to multiple
  1805. addresses/ports.
  1806. +
  1807. This option is deprecated; you can get the same behavior with DirPort now
  1808. that it supports NoAdvertise and explicit addresses.
  1809. [[DirPolicy]] **DirPolicy** __policy__,__policy__,__...__::
  1810. Set an entrance policy for this server, to limit who can connect to the
  1811. directory ports. The policies have the same form as exit policies above,
  1812. except that port specifiers are ignored. Any address not matched by
  1813. some entry in the policy is accepted.
  1814. [[DirCache]] **DirCache** **0**|**1**::
  1815. When this option is set, Tor caches all current directory documents and
  1816. accepts client requests for them. Setting DirPort is not required for this,
  1817. because clients connect via the ORPort by default. Setting either DirPort
  1818. or BridgeRelay and setting DirCache to 0 is not supported. (Default: 1)
  1819. DIRECTORY AUTHORITY SERVER OPTIONS
  1820. ----------------------------------
  1821. The following options enable operation as a directory authority, and
  1822. control how Tor behaves as a directory authority. You should not need
  1823. to adjust any of them if you're running a regular relay or exit server
  1824. on the public Tor network.
  1825. [[AuthoritativeDirectory]] **AuthoritativeDirectory** **0**|**1**::
  1826. When this option is set to 1, Tor operates as an authoritative directory
  1827. server. Instead of caching the directory, it generates its own list of
  1828. good servers, signs it, and sends that to the clients. Unless the clients
  1829. already have you listed as a trusted directory, you probably do not want
  1830. to set this option.
  1831. [[V3AuthoritativeDirectory]] **V3AuthoritativeDirectory** **0**|**1**::
  1832. When this option is set in addition to **AuthoritativeDirectory**, Tor
  1833. generates version 3 network statuses and serves descriptors, etc as
  1834. described in dir-spec.txt file of https://spec.torproject.org/[torspec]
  1835. (for Tor clients and servers running atleast 0.2.0.x).
  1836. [[VersioningAuthoritativeDirectory]] **VersioningAuthoritativeDirectory** **0**|**1**::
  1837. When this option is set to 1, Tor adds information on which versions of
  1838. Tor are still believed safe for use to the published directory. Each
  1839. version 1 authority is automatically a versioning authority; version 2
  1840. authorities provide this service optionally. See **RecommendedVersions**,
  1841. **RecommendedClientVersions**, and **RecommendedServerVersions**.
  1842. [[RecommendedVersions]] **RecommendedVersions** __STRING__::
  1843. STRING is a comma-separated list of Tor versions currently believed to be
  1844. safe. The list is included in each directory, and nodes which pull down the
  1845. directory learn whether they need to upgrade. This option can appear
  1846. multiple times: the values from multiple lines are spliced together. When
  1847. this is set then **VersioningAuthoritativeDirectory** should be set too.
  1848. [[RecommendedPackages]] **RecommendedPackages** __PACKAGENAME__ __VERSION__ __URL__ __DIGESTTYPE__**=**__DIGEST__ ::
  1849. Adds "package" line to the directory authority's vote. This information
  1850. is used to vote on the correct URL and digest for the released versions
  1851. of different Tor-related packages, so that the consensus can certify
  1852. them. This line may appear any number of times.
  1853. [[RecommendedClientVersions]] **RecommendedClientVersions** __STRING__::
  1854. STRING is a comma-separated list of Tor versions currently believed to be
  1855. safe for clients to use. This information is included in version 2
  1856. directories. If this is not set then the value of **RecommendedVersions**
  1857. is used. When this is set then **VersioningAuthoritativeDirectory** should
  1858. be set too.
  1859. [[BridgeAuthoritativeDir]] **BridgeAuthoritativeDir** **0**|**1**::
  1860. When this option is set in addition to **AuthoritativeDirectory**, Tor
  1861. accepts and serves server descriptors, but it caches and serves the main
  1862. networkstatus documents rather than generating its own. (Default: 0)
  1863. [[MinUptimeHidServDirectoryV2]] **MinUptimeHidServDirectoryV2** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  1864. Minimum uptime of a v2 hidden service directory to be accepted as such by
  1865. authoritative directories. (Default: 25 hours)
  1866. [[RecommendedServerVersions]] **RecommendedServerVersions** __STRING__::
  1867. STRING is a comma-separated list of Tor versions currently believed to be
  1868. safe for servers to use. This information is included in version 2
  1869. directories. If this is not set then the value of **RecommendedVersions**
  1870. is used. When this is set then **VersioningAuthoritativeDirectory** should
  1871. be set too.
  1872. [[ConsensusParams]] **ConsensusParams** __STRING__::
  1873. STRING is a space-separated list of key=value pairs that Tor will include
  1874. in the "params" line of its networkstatus vote.
  1875. [[DirAllowPrivateAddresses]] **DirAllowPrivateAddresses** **0**|**1**::
  1876. If set to 1, Tor will accept server descriptors with arbitrary "Address"
  1877. elements. Otherwise, if the address is not an IP address or is a private IP
  1878. address, it will reject the server descriptor. (Default: 0)
  1879. [[AuthDirBadExit]] **AuthDirBadExit** __AddressPattern...__::
  1880. Authoritative directories only. A set of address patterns for servers that
  1881. will be listed as bad exits in any network status document this authority
  1882. publishes, if **AuthDirListBadExits** is set.
  1883. +
  1884. (The address pattern syntax here and in the options below
  1885. is the same as for exit policies, except that you don't need to say
  1886. "accept" or "reject", and ports are not needed.)
  1887. [[AuthDirInvalid]] **AuthDirInvalid** __AddressPattern...__::
  1888. Authoritative directories only. A set of address patterns for servers that
  1889. will never be listed as "valid" in any network status document that this
  1890. authority publishes.
  1891. [[AuthDirReject]] **AuthDirReject** __AddressPattern__...::
  1892. Authoritative directories only. A set of address patterns for servers that
  1893. will never be listed at all in any network status document that this
  1894. authority publishes, or accepted as an OR address in any descriptor
  1895. submitted for publication by this authority.
  1896. [[AuthDirBadExitCCs]] **AuthDirBadExitCCs** __CC__,... +
  1897. [[AuthDirInvalidCCs]] **AuthDirInvalidCCs** __CC__,... +
  1898. [[AuthDirRejectCCs]] **AuthDirRejectCCs** __CC__,...::
  1899. Authoritative directories only. These options contain a comma-separated
  1900. list of country codes such that any server in one of those country codes
  1901. will be marked as a bad exit/invalid for use, or rejected
  1902. entirely.
  1903. [[AuthDirListBadExits]] **AuthDirListBadExits** **0**|**1**::
  1904. Authoritative directories only. If set to 1, this directory has some
  1905. opinion about which nodes are unsuitable as exit nodes. (Do not set this to
  1906. 1 unless you plan to list non-functioning exits as bad; otherwise, you are
  1907. effectively voting in favor of every declared exit as an exit.)
  1908. [[AuthDirMaxServersPerAddr]] **AuthDirMaxServersPerAddr** __NUM__::
  1909. Authoritative directories only. The maximum number of servers that we will
  1910. list as acceptable on a single IP address. Set this to "0" for "no limit".
  1911. (Default: 2)
  1912. [[AuthDirMaxServersPerAuthAddr]] **AuthDirMaxServersPerAuthAddr** __NUM__::
  1913. Authoritative directories only. Like AuthDirMaxServersPerAddr, but applies
  1914. to addresses shared with directory authorities. (Default: 5)
  1915. [[AuthDirFastGuarantee]] **AuthDirFastGuarantee** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  1916. Authoritative directories only. If non-zero, always vote the
  1917. Fast flag for any relay advertising this amount of capacity or
  1918. more. (Default: 100 KBytes)
  1919. [[AuthDirGuardBWGuarantee]] **AuthDirGuardBWGuarantee** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  1920. Authoritative directories only. If non-zero, this advertised capacity
  1921. or more is always sufficient to satisfy the bandwidth requirement
  1922. for the Guard flag. (Default: 250 KBytes)
  1923. [[AuthDirPinKeys]] **AuthDirPinKeys** **0**|**1**::
  1924. Authoritative directories only. If non-zero, do not allow any relay to
  1925. publish a descriptor if any other relay has reserved its <Ed25519,RSA>
  1926. identity keypair. In all cases, Tor records every keypair it accepts
  1927. in a journal if it is new, or if it differs from the most recently
  1928. accepted pinning for one of the keys it contains. (Default: 0)
  1929. [[BridgePassword]] **BridgePassword** __Password__::
  1930. If set, contains an HTTP authenticator that tells a bridge authority to
  1931. serve all requested bridge information. Used by the (only partially
  1932. implemented) "bridge community" design, where a community of bridge
  1933. relay operators all use an alternate bridge directory authority,
  1934. and their target user audience can periodically fetch the list of
  1935. available community bridges to stay up-to-date. (Default: not set)
  1936. [[V3AuthVotingInterval]] **V3AuthVotingInterval** __N__ **minutes**|**hours**::
  1937. V3 authoritative directories only. Configures the server's preferred voting
  1938. interval. Note that voting will __actually__ happen at an interval chosen
  1939. by consensus from all the authorities' preferred intervals. This time
  1940. SHOULD divide evenly into a day. (Default: 1 hour)
  1941. [[V3AuthVoteDelay]] **V3AuthVoteDelay** __N__ **minutes**|**hours**::
  1942. V3 authoritative directories only. Configures the server's preferred delay
  1943. between publishing its vote and assuming it has all the votes from all the
  1944. other authorities. Note that the actual time used is not the server's
  1945. preferred time, but the consensus of all preferences. (Default: 5 minutes)
  1946. [[V3AuthDistDelay]] **V3AuthDistDelay** __N__ **minutes**|**hours**::
  1947. V3 authoritative directories only. Configures the server's preferred delay
  1948. between publishing its consensus and signature and assuming it has all the
  1949. signatures from all the other authorities. Note that the actual time used
  1950. is not the server's preferred time, but the consensus of all preferences.
  1951. (Default: 5 minutes)
  1952. [[V3AuthNIntervalsValid]] **V3AuthNIntervalsValid** __NUM__::
  1953. V3 authoritative directories only. Configures the number of VotingIntervals
  1954. for which each consensus should be valid for. Choosing high numbers
  1955. increases network partitioning risks; choosing low numbers increases
  1956. directory traffic. Note that the actual number of intervals used is not the
  1957. server's preferred number, but the consensus of all preferences. Must be at
  1958. least 2. (Default: 3)
  1959. [[V3BandwidthsFile]] **V3BandwidthsFile** __FILENAME__::
  1960. V3 authoritative directories only. Configures the location of the
  1961. bandwidth-authority generated file storing information on relays' measured
  1962. bandwidth capacities. (Default: unset)
  1963. [[V3AuthUseLegacyKey]] **V3AuthUseLegacyKey** **0**|**1**::
  1964. If set, the directory authority will sign consensuses not only with its
  1965. own signing key, but also with a "legacy" key and certificate with a
  1966. different identity. This feature is used to migrate directory authority
  1967. keys in the event of a compromise. (Default: 0)
  1968. [[RephistTrackTime]] **RephistTrackTime** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  1969. Tells an authority, or other node tracking node reliability and history,
  1970. that fine-grained information about nodes can be discarded when it hasn't
  1971. changed for a given amount of time. (Default: 24 hours)
  1972. [[AuthDirHasIPv6Connectivity]] **AuthDirHasIPv6Connectivity** **0**|**1**::
  1973. Authoritative directories only. When set to 0, OR ports with an
  1974. IPv6 address are being accepted without reachability testing.
  1975. When set to 1, IPv6 OR ports are being tested just like IPv4 OR
  1976. ports. (Default: 0)
  1977. [[MinMeasuredBWsForAuthToIgnoreAdvertised]] **MinMeasuredBWsForAuthToIgnoreAdvertised** __N__::
  1978. A total value, in abstract bandwidth units, describing how much
  1979. measured total bandwidth an authority should have observed on the network
  1980. before it will treat advertised bandwidths as wholly
  1981. unreliable. (Default: 500)
  1982. HIDDEN SERVICE OPTIONS
  1983. ----------------------
  1984. The following options are used to configure a hidden service.
  1985. [[HiddenServiceDir]] **HiddenServiceDir** __DIRECTORY__::
  1986. Store data files for a hidden service in DIRECTORY. Every hidden service
  1987. must have a separate directory. You may use this option multiple times to
  1988. specify multiple services. DIRECTORY must be an existing directory.
  1989. (Note: in current versions of Tor, if DIRECTORY is a relative path,
  1990. it will be relative to current
  1991. working directory of Tor instance, not to its DataDirectory. Do not
  1992. rely on this behavior; it is not guaranteed to remain the same in future
  1993. versions.)
  1994. [[HiddenServicePort]] **HiddenServicePort** __VIRTPORT__ [__TARGET__]::
  1995. Configure a virtual port VIRTPORT for a hidden service. You may use this
  1996. option multiple times; each time applies to the service using the most
  1997. recent HiddenServiceDir. By default, this option maps the virtual port to
  1998. the same port on 127.0.0.1 over TCP. You may override the target port,
  1999. address, or both by specifying a target of addr, port, addr:port, or
  2000. **unix:**__path__. (You can specify an IPv6 target as [addr]:port.)
  2001. You may also have multiple lines with the same VIRTPORT: when a user
  2002. connects to that VIRTPORT, one of the TARGETs from those lines will be
  2003. chosen at random.
  2004. [[PublishHidServDescriptors]] **PublishHidServDescriptors** **0**|**1**::
  2005. If set to 0, Tor will run any hidden services you configure, but it won't
  2006. advertise them to the rendezvous directory. This option is only useful if
  2007. you're using a Tor controller that handles hidserv publishing for you.
  2008. (Default: 1)
  2009. [[HiddenServiceVersion]] **HiddenServiceVersion** __version__,__version__,__...__::
  2010. A list of rendezvous service descriptor versions to publish for the hidden
  2011. service. Currently, only version 2 is supported. (Default: 2)
  2012. [[HiddenServiceAuthorizeClient]] **HiddenServiceAuthorizeClient** __auth-type__ __client-name__,__client-name__,__...__::
  2013. If configured, the hidden service is accessible for authorized clients
  2014. only. The auth-type can either be \'basic' for a general-purpose
  2015. authorization protocol or \'stealth' for a less scalable protocol that also
  2016. hides service activity from unauthorized clients. Only clients that are
  2017. listed here are authorized to access the hidden service. Valid client names
  2018. are 1 to 16 characters long and only use characters in A-Za-z0-9+-_ (no
  2019. spaces). If this option is set, the hidden service is not accessible for
  2020. clients without authorization any more. Generated authorization data can be
  2021. found in the hostname file. Clients need to put this authorization data in
  2022. their configuration file using **HidServAuth**.
  2023. [[HiddenServiceAllowUnknownPorts]] **HiddenServiceAllowUnknownPorts** **0**|**1**::
  2024. If set to 1, then connections to unrecognized ports do not cause the
  2025. current hidden service to close rendezvous circuits. (Setting this to 0 is
  2026. not an authorization mechanism; it is instead meant to be a mild
  2027. inconvenience to port-scanners.) (Default: 0)
  2028. [[HiddenServiceMaxStreams]] **HiddenServiceMaxStreams** __N__::
  2029. The maximum number of simultaneous streams (connections) per rendezvous
  2030. circuit. (Setting this to 0 will allow an unlimited number of simultanous
  2031. streams.) (Default: 0)
  2032. [[HiddenServiceMaxStreamsCloseCircuit]] **HiddenServiceMaxStreamsCloseCircuit** **0**|**1**::
  2033. If set to 1, then exceeding **HiddenServiceMaxStreams** will cause the
  2034. offending rendezvous circuit to be torn down, as opposed to stream creation
  2035. requests that exceed the limit being silently ignored. (Default: 0)
  2036. [[RendPostPeriod]] **RendPostPeriod** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  2037. Every time the specified period elapses, Tor uploads any rendezvous
  2038. service descriptors to the directory servers. This information is also
  2039. uploaded whenever it changes. (Default: 1 hour)
  2040. [[HiddenServiceDirGroupReadable]] **HiddenServiceDirGroupReadable** **0**|**1**::
  2041. If this option is set to 1, allow the filesystem group to read the
  2042. hidden service directory and hostname file. If the option is set to 0,
  2043. only owner is able to read the hidden service directory. (Default: 0)
  2044. Has no effect on Windows.
  2045. [[HiddenServiceNumIntroductionPoints]] **HiddenServiceNumIntroductionPoints** __NUM__::
  2046. Number of introduction points the hidden service will have. You can't
  2047. have more than 10. (Default: 3)
  2048. TESTING NETWORK OPTIONS
  2049. -----------------------
  2050. The following options are used for running a testing Tor network.
  2051. [[TestingTorNetwork]] **TestingTorNetwork** **0**|**1**::
  2052. If set to 1, Tor adjusts default values of the configuration options below,
  2053. so that it is easier to set up a testing Tor network. May only be set if
  2054. non-default set of DirAuthorities is set. Cannot be unset while Tor is
  2055. running.
  2056. (Default: 0) +
  2057. ServerDNSAllowBrokenConfig 1
  2058. DirAllowPrivateAddresses 1
  2059. EnforceDistinctSubnets 0
  2060. AssumeReachable 1
  2061. AuthDirMaxServersPerAddr 0
  2062. AuthDirMaxServersPerAuthAddr 0
  2063. ClientBootstrapConsensusAuthorityDownloadSchedule 0, 2,
  2064. 4 (for 40 seconds), 8, 16, 32, 60
  2065. ClientBootstrapConsensusFallbackDownloadSchedule 0, 1,
  2066. 4 (for 40 seconds), 8, 16, 32, 60
  2067. ClientBootstrapConsensusAuthorityOnlyDownloadSchedule 0, 1,
  2068. 4 (for 40 seconds), 8, 16, 32, 60
  2069. ClientBootstrapConsensusMaxDownloadTries 80
  2070. ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries 80
  2071. ClientDNSRejectInternalAddresses 0
  2072. ClientRejectInternalAddresses 0
  2073. CountPrivateBandwidth 1
  2074. ExitPolicyRejectPrivate 0
  2075. ExtendAllowPrivateAddresses 1
  2076. V3AuthVotingInterval 5 minutes
  2077. V3AuthVoteDelay 20 seconds
  2078. V3AuthDistDelay 20 seconds
  2079. MinUptimeHidServDirectoryV2 0 seconds
  2080. TestingV3AuthInitialVotingInterval 5 minutes
  2081. TestingV3AuthInitialVoteDelay 20 seconds
  2082. TestingV3AuthInitialDistDelay 20 seconds
  2083. TestingAuthDirTimeToLearnReachability 0 minutes
  2084. TestingEstimatedDescriptorPropagationTime 0 minutes
  2085. TestingServerDownloadSchedule 0, 0, 0, 5, 10, 15, 20, 30, 60
  2086. TestingClientDownloadSchedule 0, 0, 5, 10, 15, 20, 30, 60
  2087. TestingServerConsensusDownloadSchedule 0, 0, 5, 10, 15, 20, 30, 60
  2088. TestingClientConsensusDownloadSchedule 0, 0, 5, 10, 15, 20, 30, 60
  2089. TestingBridgeDownloadSchedule 60, 30, 30, 60
  2090. TestingClientMaxIntervalWithoutRequest 5 seconds
  2091. TestingDirConnectionMaxStall 30 seconds
  2092. TestingConsensusMaxDownloadTries 80
  2093. TestingDescriptorMaxDownloadTries 80
  2094. TestingMicrodescMaxDownloadTries 80
  2095. TestingCertMaxDownloadTries 80
  2096. TestingEnableConnBwEvent 1
  2097. TestingEnableCellStatsEvent 1
  2098. TestingEnableTbEmptyEvent 1
  2099. [[TestingV3AuthInitialVotingInterval]] **TestingV3AuthInitialVotingInterval** __N__ **minutes**|**hours**::
  2100. Like V3AuthVotingInterval, but for initial voting interval before the first
  2101. consensus has been created. Changing this requires that
  2102. **TestingTorNetwork** is set. (Default: 30 minutes)
  2103. [[TestingV3AuthInitialVoteDelay]] **TestingV3AuthInitialVoteDelay** __N__ **minutes**|**hours**::
  2104. Like V3AuthVoteDelay, but for initial voting interval before
  2105. the first consensus has been created. Changing this requires that
  2106. **TestingTorNetwork** is set. (Default: 5 minutes)
  2107. [[TestingV3AuthInitialDistDelay]] **TestingV3AuthInitialDistDelay** __N__ **minutes**|**hours**::
  2108. Like V3AuthDistDelay, but for initial voting interval before
  2109. the first consensus has been created. Changing this requires that
  2110. **TestingTorNetwork** is set. (Default: 5 minutes)
  2111. [[TestingV3AuthVotingStartOffset]] **TestingV3AuthVotingStartOffset** __N__ **seconds**|**minutes**|**hours**::
  2112. Directory authorities offset voting start time by this much.
  2113. Changing this requires that **TestingTorNetwork** is set. (Default: 0)
  2114. [[TestingAuthDirTimeToLearnReachability]] **TestingAuthDirTimeToLearnReachability** __N__ **minutes**|**hours**::
  2115. After starting as an authority, do not make claims about whether routers
  2116. are Running until this much time has passed. Changing this requires
  2117. that **TestingTorNetwork** is set. (Default: 30 minutes)
  2118. [[TestingEstimatedDescriptorPropagationTime]] **TestingEstimatedDescriptorPropagationTime** __N__ **minutes**|**hours**::
  2119. Clients try downloading server descriptors from directory caches after this
  2120. time. Changing this requires that **TestingTorNetwork** is set. (Default:
  2121. 10 minutes)
  2122. [[TestingMinFastFlagThreshold]] **TestingMinFastFlagThreshold** __N__ **bytes**|**KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  2123. Minimum value for the Fast flag. Overrides the ordinary minimum taken
  2124. from the consensus when TestingTorNetwork is set. (Default: 0.)
  2125. [[TestingServerDownloadSchedule]] **TestingServerDownloadSchedule** __N__,__N__,__...__::
  2126. Schedule for when servers should download things in general. Changing this
  2127. requires that **TestingTorNetwork** is set. (Default: 0, 0, 0, 60, 60, 120,
  2128. 300, 900, 2147483647)
  2129. [[TestingClientDownloadSchedule]] **TestingClientDownloadSchedule** __N__,__N__,__...__::
  2130. Schedule for when clients should download things in general. Changing this
  2131. requires that **TestingTorNetwork** is set. (Default: 0, 0, 60, 300, 600,
  2132. 2147483647)
  2133. [[TestingServerConsensusDownloadSchedule]] **TestingServerConsensusDownloadSchedule** __N__,__N__,__...__::
  2134. Schedule for when servers should download consensuses. Changing this
  2135. requires that **TestingTorNetwork** is set. (Default: 0, 0, 60, 300, 600,
  2136. 1800, 1800, 1800, 1800, 1800, 3600, 7200)
  2137. [[TestingClientConsensusDownloadSchedule]] **TestingClientConsensusDownloadSchedule** __N__,__N__,__...__::
  2138. Schedule for when clients should download consensuses. Changing this
  2139. requires that **TestingTorNetwork** is set. (Default: 0, 0, 60, 300, 600,
  2140. 1800, 3600, 3600, 3600, 10800, 21600, 43200)
  2141. [[TestingBridgeDownloadSchedule]] **TestingBridgeDownloadSchedule** __N__,__N__,__...__::
  2142. Schedule for when clients should download bridge descriptors. Changing this
  2143. requires that **TestingTorNetwork** is set. (Default: 3600, 900, 900, 3600)
  2144. [[TestingClientMaxIntervalWithoutRequest]] **TestingClientMaxIntervalWithoutRequest** __N__ **seconds**|**minutes**::
  2145. When directory clients have only a few descriptors to request, they batch
  2146. them until they have more, or until this amount of time has passed.
  2147. Changing this requires that **TestingTorNetwork** is set. (Default: 10
  2148. minutes)
  2149. [[TestingDirConnectionMaxStall]] **TestingDirConnectionMaxStall** __N__ **seconds**|**minutes**::
  2150. Let a directory connection stall this long before expiring it.
  2151. Changing this requires that **TestingTorNetwork** is set. (Default:
  2152. 5 minutes)
  2153. [[TestingConsensusMaxDownloadTries]] **TestingConsensusMaxDownloadTries** __NUM__::
  2154. Try this many times to download a consensus before giving up. Changing
  2155. this requires that **TestingTorNetwork** is set. (Default: 8)
  2156. [[TestingDescriptorMaxDownloadTries]] **TestingDescriptorMaxDownloadTries** __NUM__::
  2157. Try this often to download a server descriptor before giving up.
  2158. Changing this requires that **TestingTorNetwork** is set. (Default: 8)
  2159. [[TestingMicrodescMaxDownloadTries]] **TestingMicrodescMaxDownloadTries** __NUM__::
  2160. Try this often to download a microdesc descriptor before giving up.
  2161. Changing this requires that **TestingTorNetwork** is set. (Default: 8)
  2162. [[TestingCertMaxDownloadTries]] **TestingCertMaxDownloadTries** __NUM__::
  2163. Try this often to download a v3 authority certificate before giving up.
  2164. Changing this requires that **TestingTorNetwork** is set. (Default: 8)
  2165. [[TestingDirAuthVoteExit]] **TestingDirAuthVoteExit** __node__,__node__,__...__::
  2166. A list of identity fingerprints, country codes, and
  2167. address patterns of nodes to vote Exit for regardless of their
  2168. uptime, bandwidth, or exit policy. See the **ExcludeNodes**
  2169. option for more information on how to specify nodes.
  2170. +
  2171. In order for this option to have any effect, **TestingTorNetwork**
  2172. has to be set. See the **ExcludeNodes** option for more
  2173. information on how to specify nodes.
  2174. [[TestingDirAuthVoteExitIsStrict]] **TestingDirAuthVoteExitIsStrict** **0**|**1** ::
  2175. If True (1), a node will never receive the Exit flag unless it is specified
  2176. in the **TestingDirAuthVoteExit** list, regardless of its uptime, bandwidth,
  2177. or exit policy.
  2178. +
  2179. In order for this option to have any effect, **TestingTorNetwork**
  2180. has to be set.
  2181. [[TestingDirAuthVoteGuard]] **TestingDirAuthVoteGuard** __node__,__node__,__...__::
  2182. A list of identity fingerprints and country codes and
  2183. address patterns of nodes to vote Guard for regardless of their
  2184. uptime and bandwidth. See the **ExcludeNodes** option for more
  2185. information on how to specify nodes.
  2186. +
  2187. In order for this option to have any effect, **TestingTorNetwork**
  2188. has to be set.
  2189. [[TestingDirAuthVoteGuardIsStrict]] **TestingDirAuthVoteGuardIsStrict** **0**|**1** ::
  2190. If True (1), a node will never receive the Guard flag unless it is specified
  2191. in the **TestingDirAuthVoteGuard** list, regardless of its uptime and bandwidth.
  2192. +
  2193. In order for this option to have any effect, **TestingTorNetwork**
  2194. has to be set.
  2195. [[TestingDirAuthVoteHSDir]] **TestingDirAuthVoteHSDir** __node__,__node__,__...__::
  2196. A list of identity fingerprints and country codes and
  2197. address patterns of nodes to vote HSDir for regardless of their
  2198. uptime and DirPort. See the **ExcludeNodes** option for more
  2199. information on how to specify nodes.
  2200. +
  2201. In order for this option to have any effect, **TestingTorNetwork**
  2202. must be set.
  2203. [[TestingDirAuthVoteHSDirIsStrict]] **TestingDirAuthVoteHSDirIsStrict** **0**|**1** ::
  2204. If True (1), a node will never receive the HSDir flag unless it is specified
  2205. in the **TestingDirAuthVoteHSDir** list, regardless of its uptime and DirPort.
  2206. +
  2207. In order for this option to have any effect, **TestingTorNetwork**
  2208. has to be set.
  2209. [[TestingEnableConnBwEvent]] **TestingEnableConnBwEvent** **0**|**1**::
  2210. If this option is set, then Tor controllers may register for CONN_BW
  2211. events. Changing this requires that **TestingTorNetwork** is set.
  2212. (Default: 0)
  2213. [[TestingEnableCellStatsEvent]] **TestingEnableCellStatsEvent** **0**|**1**::
  2214. If this option is set, then Tor controllers may register for CELL_STATS
  2215. events. Changing this requires that **TestingTorNetwork** is set.
  2216. (Default: 0)
  2217. [[TestingEnableTbEmptyEvent]] **TestingEnableTbEmptyEvent** **0**|**1**::
  2218. If this option is set, then Tor controllers may register for TB_EMPTY
  2219. events. Changing this requires that **TestingTorNetwork** is set.
  2220. (Default: 0)
  2221. [[TestingMinExitFlagThreshold]] **TestingMinExitFlagThreshold** __N__ **KBytes**|**MBytes**|**GBytes**|**KBits**|**MBits**|**GBits**::
  2222. Sets a lower-bound for assigning an exit flag when running as an
  2223. authority on a testing network. Overrides the usual default lower bound
  2224. of 4 KB. (Default: 0)
  2225. [[TestingLinkCertLifetime]] **TestingLinkCertLifetime** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**|**months**::
  2226. Overrides the default lifetime for the certificates used to authenticate
  2227. our X509 link cert with our ed25519 signing key.
  2228. (Default: 2 days)
  2229. [[TestingAuthKeyLifetime]] **TestingAuthKeyLifetime** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**|**months**::
  2230. Overrides the default lifetime for a signing Ed25519 TLS Link authentication
  2231. key.
  2232. (Default: 2 days)
  2233. [[TestingLinkKeySlop]] **TestingLinkKeySlop** __N__ **seconds**|**minutes**|**hours** +
  2234. [[TestingAuthKeySlop]] **TestingAuthKeySlop** __N__ **seconds**|**minutes**|**hours** +
  2235. [[TestingSigningKeySlop]] **TestingSigningKeySlop** __N__ **seconds**|**minutes**|**hours**::
  2236. How early before the official expiration of a an Ed25519 signing key do
  2237. we replace it and issue a new key?
  2238. (Default: 3 hours for link and auth; 1 day for signing.)
  2239. SIGNALS
  2240. -------
  2241. Tor catches the following signals:
  2242. [[SIGTERM]] **SIGTERM**::
  2243. Tor will catch this, clean up and sync to disk if necessary, and exit.
  2244. [[SIGINT]] **SIGINT**::
  2245. Tor clients behave as with SIGTERM; but Tor servers will do a controlled
  2246. slow shutdown, closing listeners and waiting 30 seconds before exiting.
  2247. (The delay can be configured with the ShutdownWaitLength config option.)
  2248. [[SIGHUP]] **SIGHUP**::
  2249. The signal instructs Tor to reload its configuration (including closing and
  2250. reopening logs), and kill and restart its helper processes if applicable.
  2251. [[SIGUSR1]] **SIGUSR1**::
  2252. Log statistics about current connections, past connections, and throughput.
  2253. [[SIGUSR2]] **SIGUSR2**::
  2254. Switch all logs to loglevel debug. You can go back to the old loglevels by
  2255. sending a SIGHUP.
  2256. [[SIGCHLD]] **SIGCHLD**::
  2257. Tor receives this signal when one of its helper processes has exited, so it
  2258. can clean up.
  2259. [[SIGPIPE]] **SIGPIPE**::
  2260. Tor catches this signal and ignores it.
  2261. [[SIGXFSZ]] **SIGXFSZ**::
  2262. If this signal exists on your platform, Tor catches and ignores it.
  2263. FILES
  2264. -----
  2265. **@CONFDIR@/torrc**::
  2266. The configuration file, which contains "option value" pairs.
  2267. **$HOME/.torrc**::
  2268. Fallback location for torrc, if @CONFDIR@/torrc is not found.
  2269. **@LOCALSTATEDIR@/lib/tor/**::
  2270. The tor process stores keys and other data here.
  2271. __DataDirectory__**/cached-status/**::
  2272. The most recently downloaded network status document for each authority.
  2273. Each file holds one such document; the filenames are the hexadecimal
  2274. identity key fingerprints of the directory authorities. Mostly obsolete.
  2275. __DataDirectory__**/cached-certs**::
  2276. This file holds downloaded directory key certificates that are used to
  2277. verify authenticity of documents generated by Tor directory authorities.
  2278. __DataDirectory__**/cached-consensus** and/or **cached-microdesc-consensus**::
  2279. The most recent consensus network status document we've downloaded.
  2280. __DataDirectory__**/cached-descriptors** and **cached-descriptors.new**::
  2281. These files hold downloaded router statuses. Some routers may appear more
  2282. than once; if so, the most recently published descriptor is used. Lines
  2283. beginning with @-signs are annotations that contain more information about
  2284. a given router. The ".new" file is an append-only journal; when it gets
  2285. too large, all entries are merged into a new cached-descriptors file.
  2286. __DataDirectory__**/cached-microdescs** and **cached-microdescs.new**::
  2287. These files hold downloaded microdescriptors. Lines beginning with
  2288. @-signs are annotations that contain more information about a given
  2289. router. The ".new" file is an append-only journal; when it gets too
  2290. large, all entries are merged into a new cached-microdescs file.
  2291. __DataDirectory__**/cached-routers** and **cached-routers.new**::
  2292. Obsolete versions of cached-descriptors and cached-descriptors.new. When
  2293. Tor can't find the newer files, it looks here instead.
  2294. __DataDirectory__**/state**::
  2295. A set of persistent key-value mappings. These are documented in
  2296. the file. These include:
  2297. - The current entry guards and their status.
  2298. - The current bandwidth accounting values (unused so far; see
  2299. below).
  2300. - When the file was last written
  2301. - What version of Tor generated the state file
  2302. - A short history of bandwidth usage, as produced in the server
  2303. descriptors.
  2304. __DataDirectory__**/bw_accounting**::
  2305. Used to track bandwidth accounting values (when the current period starts
  2306. and ends; how much has been read and written so far this period). This file
  2307. is obsolete, and the data is now stored in the \'state' file as well. Only
  2308. used when bandwidth accounting is enabled.
  2309. __DataDirectory__**/control_auth_cookie**::
  2310. Used for cookie authentication with the controller. Location can be
  2311. overridden by the CookieAuthFile config option. Regenerated on startup. See
  2312. control-spec.txt in https://spec.torproject.org/[torspec] for details.
  2313. Only used when cookie authentication is enabled.
  2314. __DataDirectory__**/lock**::
  2315. This file is used to prevent two Tor instances from using same data
  2316. directory. If access to this file is locked, data directory is already
  2317. in use by Tor.
  2318. __DataDirectory__**/keys/***::
  2319. Only used by servers. Holds identity keys and onion keys.
  2320. __DataDirectory__**/keys/authority_identity_key**::
  2321. A v3 directory authority's master identity key, used to authenticate its
  2322. signing key. Tor doesn't use this while it's running. The tor-gencert
  2323. program uses this. If you're running an authority, you should keep this
  2324. key offline, and not actually put it here.
  2325. __DataDirectory__**/keys/authority_certificate**::
  2326. A v3 directory authority's certificate, which authenticates the authority's
  2327. current vote- and consensus-signing key using its master identity key.
  2328. Only directory authorities use this file.
  2329. __DataDirectory__**/keys/authority_signing_key**::
  2330. A v3 directory authority's signing key, used to sign votes and consensuses.
  2331. Only directory authorities use this file. Corresponds to the
  2332. **authority_certificate** cert.
  2333. __DataDirectory__**/keys/legacy_certificate**::
  2334. As authority_certificate: used only when V3AuthUseLegacyKey is set.
  2335. See documentation for V3AuthUseLegacyKey.
  2336. __DataDirectory__**/keys/legacy_signing_key**::
  2337. As authority_signing_key: used only when V3AuthUseLegacyKey is set.
  2338. See documentation for V3AuthUseLegacyKey.
  2339. __DataDirectory__**/keys/secret_id_key**::
  2340. A relay's RSA1024 permanent identity key, including private and public
  2341. components. Used to sign router descriptors, and to sign other keys.
  2342. __DataDirectory__**/keys/ed25519_master_id_public_key**::
  2343. The public part of a relay's Ed25519 permanent identity key.
  2344. __DataDirectory__**/keys/ed25519_master_id_secret_key**::
  2345. The private part of a relay's Ed25519 permanent identity key. This key
  2346. is used to sign the medium-term ed25519 signing key. This file can be
  2347. kept offline, or kept encrypted. If so, Tor will not be able to generate
  2348. new signing keys itself; you'll need to use tor --keygen yourself to do
  2349. so.
  2350. __DataDirectory__**/keys/ed25519_signing_secret_key**::
  2351. The private and public components of a relay's medium-term Ed25519 signing
  2352. key. This key is authenticated by the Ed25519 master key, in turn
  2353. authenticates other keys (and router descriptors).
  2354. __DataDirectory__**/keys/ed25519_signing_cert**::
  2355. The certificate which authenticates "ed25519_signing_secret_key" as
  2356. having been signed by the Ed25519 master key.
  2357. __DataDirectory__**/keys/secret_onion_key**::
  2358. A relay's RSA1024 short-term onion key. Used to decrypt old-style ("TAP")
  2359. circuit extension requests.
  2360. __DataDirectory__**/keys/secret_onion_key_ntor**::
  2361. A relay's Curve25519 short-term onion key. Used to handle modern ("ntor")
  2362. circuit extension requests.
  2363. __DataDirectory__**/fingerprint**::
  2364. Only used by servers. Holds the fingerprint of the server's identity key.
  2365. __DataDirectory__**/hashed-fingerprint**::
  2366. Only used by bridges. Holds the hashed fingerprint of the bridge's
  2367. identity key. (That is, the hash of the hash of the identity key.)
  2368. __DataDirectory__**/v3-status-votes**::
  2369. Only for v3 authoritative directory servers. This file contains
  2370. status votes from all the authoritative directory servers.
  2371. __DataDirectory__**/unverified-consensus**::
  2372. This file contains a network consensus document that has been downloaded,
  2373. but which we didn't have the right certificates to check yet.
  2374. __DataDirectory__**/unverified-microdesc-consensus**::
  2375. This file contains a microdescriptor-flavored network consensus document
  2376. that has been downloaded, but which we didn't have the right certificates
  2377. to check yet.
  2378. __DataDirectory__**/unparseable-desc**::
  2379. Onion server descriptors that Tor was unable to parse are dumped to this
  2380. file. Only used for debugging.
  2381. __DataDirectory__**/router-stability**::
  2382. Only used by authoritative directory servers. Tracks measurements for
  2383. router mean-time-between-failures so that authorities have a good idea of
  2384. how to set their Stable flags.
  2385. __DataDirectory__**/stats/dirreq-stats**::
  2386. Only used by directory caches and authorities. This file is used to
  2387. collect directory request statistics.
  2388. __DataDirectory__**/stats/entry-stats**::
  2389. Only used by servers. This file is used to collect incoming connection
  2390. statistics by Tor entry nodes.
  2391. __DataDirectory__**/stats/bridge-stats**::
  2392. Only used by servers. This file is used to collect incoming connection
  2393. statistics by Tor bridges.
  2394. __DataDirectory__**/stats/exit-stats**::
  2395. Only used by servers. This file is used to collect outgoing connection
  2396. statistics by Tor exit routers.
  2397. __DataDirectory__**/stats/buffer-stats**::
  2398. Only used by servers. This file is used to collect buffer usage
  2399. history.
  2400. __DataDirectory__**/stats/conn-stats**::
  2401. Only used by servers. This file is used to collect approximate connection
  2402. history (number of active connections over time).
  2403. __DataDirectory__**/networkstatus-bridges**::
  2404. Only used by authoritative bridge directories. Contains information
  2405. about bridges that have self-reported themselves to the bridge
  2406. authority.
  2407. __HiddenServiceDirectory__**/hostname**::
  2408. The <base32-encoded-fingerprint>.onion domain name for this hidden service.
  2409. If the hidden service is restricted to authorized clients only, this file
  2410. also contains authorization data for all clients.
  2411. __HiddenServiceDirectory__**/private_key**::
  2412. The private key for this hidden service.
  2413. __HiddenServiceDirectory__**/client_keys**::
  2414. Authorization data for a hidden service that is only accessible by
  2415. authorized clients.
  2416. SEE ALSO
  2417. --------
  2418. **torsocks**(1), **torify**(1) +
  2419. **https://www.torproject.org/**
  2420. **torspec: https://spec.torproject.org **
  2421. BUGS
  2422. ----
  2423. Plenty, probably. Tor is still in development. Please report them at https://trac.torproject.org/.
  2424. AUTHORS
  2425. -------
  2426. Roger Dingledine [arma at mit.edu], Nick Mathewson [nickm at alum.mit.edu].