tor.1.txt 78 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. TOR(1)
  6. ======
  7. NAME
  8. ----
  9. tor - The second-generation onion router
  10. SYNOPSIS
  11. --------
  12. **tor** [__OPTION__ __value__]...
  13. DESCRIPTION
  14. -----------
  15. __tor__ is a connection-oriented anonymizing communication
  16. service. Users choose a source-routed path through a set of nodes, and
  17. negotiate a "virtual circuit" through the network, in which each node
  18. knows its predecessor and successor, but no others. Traffic flowing down
  19. the circuit is unwrapped by a symmetric key at each node, which reveals
  20. the downstream node. +
  21. Basically __tor__ provides a distributed network of servers ("onion routers").
  22. Users bounce their TCP streams -- web traffic, ftp, ssh, etc -- around the
  23. routers, and recipients, observers, and even the routers themselves have
  24. difficulty tracking the source of the stream.
  25. OPTIONS
  26. -------
  27. **-h**, **-help**::
  28. Display a short help message and exit.
  29. **-f** __FILE__::
  30. FILE contains further "option value" pairs. (Default: @CONFDIR@/torrc)
  31. **--hash-password**::
  32. Generates a hashed password for control port access.
  33. **--list-fingerprint**::
  34. Generate your keys and output your nickname and fingerprint.
  35. **--verify-config**::
  36. Verify the configuration file is valid.
  37. **--nt-service**::
  38. **--service [install|remove|start|stop]** Manage the Tor Windows
  39. NT/2000/XP service. Current instructions can be found at
  40. https://wiki.torproject.org/noreply/TheOnionRouter/TorFAQ#WinNTService
  41. **--list-torrc-options**::
  42. List all valid options.
  43. **--version**::
  44. Display Tor version and exit.
  45. **--quiet**::
  46. Do not start Tor with a console log unless explicitly requested to do so.
  47. (By default, Tor starts out logging messages at level "notice" or higher to
  48. the console, until it has parsed its configuration.)
  49. Other options can be specified either on the command-line (--option
  50. value), or in the configuration file (option value or option "value").
  51. Options are case-insensitive. C-style escaped characters are allowed inside
  52. quoted values. Options on the command line take precedence over
  53. options found in the configuration file, except indicated otherwise. To
  54. split one configuration entry into multiple lines, use a single \ before
  55. the end of the line. Comments can be used in such multiline entries, but
  56. they must start at the beginning of a line.
  57. **BandwidthRate** __N__ **bytes**|**KB**|**MB**|**GB**::
  58. A token bucket limits the average incoming bandwidth usage on this node to
  59. the specified number of bytes per second, and the average outgoing
  60. bandwidth usage to that same value. If you want to run a relay in the
  61. public network, this needs to be _at the very least_ 20 KB (that is,
  62. 20480 bytes). (Default: 5 MB)
  63. **BandwidthBurst** __N__ **bytes**|**KB**|**MB**|**GB**::
  64. Limit the maximum token bucket size (also known as the burst) to the given
  65. number of bytes in each direction. (Default: 10 MB)
  66. **MaxAdvertisedBandwidth** __N__ **bytes**|**KB**|**MB**|**GB**::
  67. If set, we will not advertise more than this amount of bandwidth for our
  68. BandwidthRate. Server operators who want to reduce the number of clients
  69. who ask to build circuits through them (since this is proportional to
  70. advertised bandwidth rate) can thus reduce the CPU demands on their server
  71. without impacting network performance.
  72. **RelayBandwidthRate** __N__ **bytes**|**KB**|**MB**|**GB**::
  73. If not 0, a separate token bucket limits the average incoming bandwidth
  74. usage for \_relayed traffic_ on this node to the specified number of bytes
  75. per second, and the average outgoing bandwidth usage to that same value.
  76. Relayed traffic currently is calculated to include answers to directory
  77. requests, but that may change in future versions. (Default: 0)
  78. **RelayBandwidthBurst** __N__ **bytes**|**KB**|**MB**|**GB**::
  79. If not 0, limit the maximum token bucket size (also known as the burst) for
  80. \_relayed traffic_ to the given number of bytes in each direction.
  81. (Default: 0)
  82. **PerConnBWRate** __N__ **bytes**|**KB**|**MB**|**GB**::
  83. If set, do separate rate limiting for each connection from a non-relay.
  84. You should never need to change this value, since a network-wide value is
  85. published in the consensus and your relay will use that value. (Default: 0)
  86. **PerConnBWBurst** __N__ **bytes**|**KB**|**MB**|**GB**::
  87. If set, do separate rate limiting for each connection from a non-relay.
  88. You should never need to change this value, since a network-wide value is
  89. published in the consensus and your relay will use that value. (Default: 0)
  90. **ConnLimit** __NUM__::
  91. The minimum number of file descriptors that must be available to the Tor
  92. process before it will start. Tor will ask the OS for as many file
  93. descriptors as the OS will allow (you can find this by "ulimit -H -n").
  94. If this number is less than ConnLimit, then Tor will refuse to start. +
  95. +
  96. You probably don't need to adjust this. It has no effect on Windows
  97. since that platform lacks getrlimit(). (Default: 1000)
  98. **ConstrainedSockets** **0**|**1**::
  99. If set, Tor will tell the kernel to attempt to shrink the buffers for all
  100. sockets to the size specified in **ConstrainedSockSize**. This is useful for
  101. virtual servers and other environments where system level TCP buffers may
  102. be limited. If you're on a virtual server, and you encounter the "Error
  103. creating network socket: No buffer space available" message, you are
  104. likely experiencing this problem. +
  105. +
  106. The preferred solution is to have the admin increase the buffer pool for
  107. the host itself via /proc/sys/net/ipv4/tcp_mem or equivalent facility;
  108. this configuration option is a second-resort. +
  109. +
  110. The DirPort option should also not be used if TCP buffers are scarce. The
  111. cached directory requests consume additional sockets which exacerbates
  112. the problem. +
  113. +
  114. You should **not** enable this feature unless you encounter the "no buffer
  115. space available" issue. Reducing the TCP buffers affects window size for
  116. the TCP stream and will reduce throughput in proportion to round trip
  117. time on long paths. (Default: 0.)
  118. **ConstrainedSockSize** __N__ **bytes**|**KB**::
  119. When **ConstrainedSockets** is enabled the receive and transmit buffers for
  120. all sockets will be set to this limit. Must be a value between 2048 and
  121. 262144, in 1024 byte increments. Default of 8192 is recommended.
  122. **ControlPort** __PORT__|**auto**::
  123. If set, Tor will accept connections on this port and allow those
  124. connections to control the Tor process using the Tor Control Protocol
  125. (described in control-spec.txt). Note: unless you also specify one or
  126. more of **HashedControlPassword** or **CookieAuthentication**,
  127. setting this option will cause Tor to allow any process on the local
  128. host to control it. (Setting both authentication methods means either
  129. method is sufficient to authenticate to Tor.) This
  130. option is required for many Tor controllers; most use the value of 9051.
  131. Set it to "auto" to have Tor pick a port for you. (Default: 0).
  132. **ControlListenAddress** __IP__[:__PORT__]::
  133. Bind the controller listener to this address. If you specify a port, bind
  134. to this port rather than the one specified in ControlPort. We strongly
  135. recommend that you leave this alone unless you know what you're doing,
  136. since giving attackers access to your control listener is really
  137. dangerous. (Default: 127.0.0.1) This directive can be specified multiple
  138. times to bind to multiple addresses/ports.
  139. **ControlSocket** __Path__::
  140. Like ControlPort, but listens on a Unix domain socket, rather than a TCP
  141. socket. (Unix and Unix-like systems only.)
  142. **ControlSocketsGroupWritable** **0**|**1**::
  143. If this option is set to 0, don't allow the filesystem group to read and
  144. write unix sockets (e.g. ControlSocket). If the option is set to 1, make
  145. the control socket readable and writable by the default GID. (Default: 0)
  146. **HashedControlPassword** __hashed_password__::
  147. Allow connections on the control port if they present
  148. the password whose one-way hash is __hashed_password__. You
  149. can compute the hash of a password by running "tor --hash-password
  150. __password__". You can provide several acceptable passwords by using more
  151. than one HashedControlPassword line.
  152. **CookieAuthentication** **0**|**1**::
  153. If this option is set to 1, allow connections on the control port
  154. when the connecting process knows the contents of a file named
  155. "control_auth_cookie", which Tor will create in its data directory. This
  156. authentication method should only be used on systems with good filesystem
  157. security. (Default: 0)
  158. **CookieAuthFile** __Path__::
  159. If set, this option overrides the default location and file name
  160. for Tor's cookie file. (See CookieAuthentication above.)
  161. **CookieAuthFileGroupReadable** **0**|**1**|__Groupname__::
  162. If this option is set to 0, don't allow the filesystem group to read the
  163. cookie file. If the option is set to 1, make the cookie file readable by
  164. the default GID. [Making the file readable by other groups is not yet
  165. implemented; let us know if you need this for some reason.] (Default: 0).
  166. **ControlPortWriteToFile** __Path__::
  167. If set, Tor writes the address and port of any control port it opens to
  168. this address. Usable by controllers to learn the actual control port
  169. when ControlPort is set to "auto".
  170. **ControlPortFileGroupReadable** **0**|**1**::
  171. If this option is set to 0, don't allow the filesystem group to read the
  172. control port file. If the option is set to 1, make the control port
  173. file readable by the default GID. (Default: 0).
  174. **DataDirectory** __DIR__::
  175. Store working data in DIR (Default: @LOCALSTATEDIR@/lib/tor)
  176. **DirServer** [__nickname__] [**flags**] __address__:__port__ __fingerprint__::
  177. Use a nonstandard authoritative directory server at the provided address
  178. and port, with the specified key fingerprint. This option can be repeated
  179. many times, for multiple authoritative directory servers. Flags are
  180. separated by spaces, and determine what kind of an authority this directory
  181. is. By default, every authority is authoritative for current ("v2")-style
  182. directories, unless the "no-v2" flag is given. If the "v1" flags is
  183. provided, Tor will use this server as an authority for old-style (v1)
  184. directories as well. (Only directory mirrors care about this.) Tor will
  185. use this server as an authority for hidden service information if the "hs"
  186. flag is set, or if the "v1" flag is set and the "no-hs" flag is **not** set.
  187. Tor will use this authority as a bridge authoritative directory if the
  188. "bridge" flag is set. If a flag "orport=**port**" is given, Tor will use the
  189. given port when opening encrypted tunnels to the dirserver. Lastly, if a
  190. flag "v3ident=**fp**" is given, the dirserver is a v3 directory authority
  191. whose v3 long-term signing key has the fingerprint **fp**. +
  192. +
  193. If no **dirserver** line is given, Tor will use the default directory
  194. servers. NOTE: this option is intended for setting up a private Tor
  195. network with its own directory authorities. If you use it, you will be
  196. distinguishable from other users, because you won't believe the same
  197. authorities they do.
  198. **AlternateDirAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__ +
  199. **AlternateHSAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__ +
  200. **AlternateBridgeAuthority** [__nickname__] [**flags**] __address__:__port__ __ fingerprint__::
  201. As DirServer, but replaces less of the default directory authorities. Using
  202. AlternateDirAuthority replaces the default Tor directory authorities, but
  203. leaves the hidden service authorities and bridge authorities in place.
  204. Similarly, Using AlternateHSAuthority replaces the default hidden service
  205. authorities, but not the directory or bridge authorities.
  206. **DisableAllSwap** **0**|**1**::
  207. If set to 1, Tor will attempt to lock all current and future memory pages,
  208. so that memory cannot be paged out. Windows, OS X and Solaris are currently
  209. not supported. We believe that this feature works on modern Gnu/Linux
  210. distributions, and that it should work on *BSD systems (untested). This
  211. option requires that you start your Tor as root, and you should use the
  212. **User** option to properly reduce Tor's privileges. (Default: 0)
  213. **FetchDirInfoEarly** **0**|**1**::
  214. If set to 1, Tor will always fetch directory information like other
  215. directory caches, even if you don't meet the normal criteria for fetching
  216. early. Normal users should leave it off. (Default: 0)
  217. **FetchDirInfoExtraEarly** **0**|**1**::
  218. If set to 1, Tor will fetch directory information before other directory
  219. caches. It will attempt to download directory information closer to the
  220. start of the consensus period. Normal users should leave it off.
  221. (Default: 0)
  222. **FetchHidServDescriptors** **0**|**1**::
  223. If set to 0, Tor will never fetch any hidden service descriptors from the
  224. rendezvous directories. This option is only useful if you're using a Tor
  225. controller that handles hidden service fetches for you. (Default: 1)
  226. **FetchServerDescriptors** **0**|**1**::
  227. If set to 0, Tor will never fetch any network status summaries or server
  228. descriptors from the directory servers. This option is only useful if
  229. you're using a Tor controller that handles directory fetches for you.
  230. (Default: 1)
  231. **FetchUselessDescriptors** **0**|**1**::
  232. If set to 1, Tor will fetch every non-obsolete descriptor from the
  233. authorities that it hears about. Otherwise, it will avoid fetching useless
  234. descriptors, for example for routers that are not running. This option is
  235. useful if you're using the contributed "exitlist" script to enumerate Tor
  236. nodes that exit to certain addresses. (Default: 0)
  237. **HTTPProxy** __host__[:__port__]::
  238. Tor will make all its directory requests through this host:port (or host:80
  239. if port is not specified), rather than connecting directly to any directory
  240. servers.
  241. **HTTPProxyAuthenticator** __username:password__::
  242. If defined, Tor will use this username:password for Basic HTTP proxy
  243. authentication, as in RFC 2617. This is currently the only form of HTTP
  244. proxy authentication that Tor supports; feel free to submit a patch if you
  245. want it to support others.
  246. **HTTPSProxy** __host__[:__port__]::
  247. Tor will make all its OR (SSL) connections through this host:port (or
  248. host:443 if port is not specified), via HTTP CONNECT rather than connecting
  249. directly to servers. You may want to set **FascistFirewall** to restrict
  250. the set of ports you might try to connect to, if your HTTPS proxy only
  251. allows connecting to certain ports.
  252. **HTTPSProxyAuthenticator** __username:password__::
  253. If defined, Tor will use this username:password for Basic HTTPS proxy
  254. authentication, as in RFC 2617. This is currently the only form of HTTPS
  255. proxy authentication that Tor supports; feel free to submit a patch if you
  256. want it to support others.
  257. **Socks4Proxy** __host__[:__port__]::
  258. Tor will make all OR connections through the SOCKS 4 proxy at host:port
  259. (or host:1080 if port is not specified).
  260. **Socks5Proxy** __host__[:__port__]::
  261. Tor will make all OR connections through the SOCKS 5 proxy at host:port
  262. (or host:1080 if port is not specified).
  263. **Socks5ProxyUsername** __username__ +
  264. **Socks5ProxyPassword** __password__::
  265. If defined, authenticate to the SOCKS 5 server using username and password
  266. in accordance to RFC 1929. Both username and password must be between 1 and
  267. 255 characters.
  268. **KeepalivePeriod** __NUM__::
  269. To keep firewalls from expiring connections, send a padding keepalive cell
  270. every NUM seconds on open connections that are in use. If the connection
  271. has no open circuits, it will instead be closed after NUM seconds of
  272. idleness. (Default: 5 minutes)
  273. **Log** __minSeverity__[-__maxSeverity__] **stderr**|**stdout**|**syslog**::
  274. Send all messages between __minSeverity__ and __maxSeverity__ to the standard
  275. output stream, the standard error stream, or to the system log. (The
  276. "syslog" value is only supported on Unix.) Recognized severity levels are
  277. debug, info, notice, warn, and err. We advise using "notice" in most cases,
  278. since anything more verbose may provide sensitive information to an
  279. attacker who obtains the logs. If only one severity level is given, all
  280. messages of that level or higher will be sent to the listed destination.
  281. **Log** __minSeverity__[-__maxSeverity__] **file** __FILENAME__::
  282. As above, but send log messages to the listed filename. The
  283. "Log" option may appear more than once in a configuration file.
  284. Messages are sent to all the logs that match their severity
  285. level.
  286. **Log** **[**__domain__,...**]**__minSeverity__[-__maxSeverity__] ... **file** __FILENAME__ +
  287. **Log** **[**__domain__,...**]**__minSeverity__[-__maxSeverity__] ... **stderr**|**stdout**|**syslog**::
  288. As above, but select messages by range of log severity __and__ by a
  289. set of "logging domains". Each logging domain corresponds to an area of
  290. functionality inside Tor. You can specify any number of severity ranges
  291. for a single log statement, each of them prefixed by a comma-separated
  292. list of logging domains. You can prefix a domain with $$~$$ to indicate
  293. negation, and use * to indicate "all domains". If you specify a severity
  294. range without a list of domains, it matches all domains. +
  295. +
  296. This is an advanced feature which is most useful for debugging one or two
  297. of Tor's subsystems at a time. +
  298. +
  299. The currently recognized domains are: general, crypto, net, config, fs,
  300. protocol, mm, http, app, control, circ, rend, bug, dir, dirserv, or, edge,
  301. acct, hist, and handshake. Domain names are case-insensitive. +
  302. +
  303. For example, "`Log [handshake]debug [~net,~mm]info notice stdout`" sends
  304. to stdout: all handshake messages of any severity, all info-and-higher
  305. messages from domains other than networking and memory management, and all
  306. messages of severity notice or higher.
  307. **LogMessageDomains** **0**|**1**::
  308. If 1, Tor includes message domains with each log message. Every log
  309. message currently has at least one domain; most currently have exactly
  310. one. This doesn't affect controller log messages. (Default: 0)
  311. **OutboundBindAddress** __IP__::
  312. Make all outbound connections originate from the IP address specified. This
  313. is only useful when you have multiple network interfaces, and you want all
  314. of Tor's outgoing connections to use a single one. This setting will be
  315. ignored for connections to the loopback addresses (127.0.0.0/8 and ::1).
  316. **PidFile** __FILE__::
  317. On startup, write our PID to FILE. On clean shutdown, remove
  318. FILE.
  319. **ProtocolWarnings** **0**|**1**::
  320. If 1, Tor will log with severity \'warn' various cases of other parties not
  321. following the Tor specification. Otherwise, they are logged with severity
  322. \'info'. (Default: 0)
  323. **RunAsDaemon** **0**|**1**::
  324. If 1, Tor forks and daemonizes to the background. This option has no effect
  325. on Windows; instead you should use the --service command-line option.
  326. (Default: 0)
  327. **SafeLogging** **0**|**1**|**relay**::
  328. Tor can scrub potentially sensitive strings from log messages (e.g.
  329. addresses) by replacing them with the string [scrubbed]. This way logs can
  330. still be useful, but they don't leave behind personally identifying
  331. information about what sites a user might have visited. +
  332. +
  333. If this option is set to 0, Tor will not perform any scrubbing, if it is
  334. set to 1, all potentially sensitive strings are replaced. If it is set to
  335. relay, all log messages generated when acting as a relay are sanitized, but
  336. all messages generated when acting as a client are not. (Default: 1)
  337. **User** __UID__::
  338. On startup, setuid to this user and setgid to their primary group.
  339. **HardwareAccel** **0**|**1**::
  340. If non-zero, try to use built-in (static) crypto hardware acceleration when
  341. available. (Default: 0)
  342. **AccelName** __NAME__::
  343. When using OpenSSL hardware crypto acceleration attempt to load the dynamic
  344. engine of this name. This must be used for any dynamic hardware engine.
  345. Names can be verified with the openssl engine command.
  346. **AccelDir** __DIR__::
  347. Specify this option if using dynamic hardware acceleration and the engine
  348. implementation library resides somewhere other than the OpenSSL default.
  349. **AvoidDiskWrites** **0**|**1**::
  350. If non-zero, try to write to disk less frequently than we would otherwise.
  351. This is useful when running on flash memory or other media that support
  352. only a limited number of writes. (Default: 0)
  353. **TunnelDirConns** **0**|**1**::
  354. If non-zero, when a directory server we contact supports it, we will build
  355. a one-hop circuit and make an encrypted connection via its ORPort.
  356. (Default: 1)
  357. **PreferTunneledDirConns** **0**|**1**::
  358. If non-zero, we will avoid directory servers that don't support tunneled
  359. directory connections, when possible. (Default: 1)
  360. **CircuitPriorityHalflife** __NUM1__::
  361. If this value is set, we override the default algorithm for choosing which
  362. circuit's cell to deliver or relay next. When the value is 0, we
  363. round-robin between the active circuits on a connection, delivering one
  364. cell from each in turn. When the value is positive, we prefer delivering
  365. cells from whichever connection has the lowest weighted cell count, where
  366. cells are weighted exponentially according to the supplied
  367. CircuitPriorityHalflife value (in seconds). If this option is not set at
  368. all, we use the behavior recommended in the current consensus
  369. networkstatus. This is an advanced option; you generally shouldn't have
  370. to mess with it. (Default: not set.)
  371. CLIENT OPTIONS
  372. --------------
  373. The following options are useful only for clients (that is, if
  374. **SocksPort** is non-zero):
  375. **AllowInvalidNodes** **entry**|**exit**|**middle**|**introduction**|**rendezvous**|**...**::
  376. If some Tor servers are obviously not working right, the directory
  377. authorities can manually mark them as invalid, meaning that it's not
  378. recommended you use them for entry or exit positions in your circuits. You
  379. can opt to use them in some circuit positions, though. The default is
  380. "middle,rendezvous", and other choices are not advised.
  381. **ExcludeSingleHopRelays** **0**|**1**::
  382. This option controls whether circuits built by Tor will include relays with
  383. the AllowSingleHopExits flag set to true. If ExcludeSingleHopRelays is set
  384. to 0, these relays will be included. Note that these relays might be at
  385. higher risk of being seized or observed, so they are not normally
  386. included. Also note that relatively few clients turn off this option,
  387. so using these relays might make your client stand out.
  388. (Default: 1)
  389. **Bridge** __IP__:__ORPort__ [fingerprint]::
  390. When set along with UseBridges, instructs Tor to use the relay at
  391. "IP:ORPort" as a "bridge" relaying into the Tor network. If "fingerprint"
  392. is provided (using the same format as for DirServer), we will verify that
  393. the relay running at that location has the right fingerprint. We also use
  394. fingerprint to look up the bridge descriptor at the bridge authority, if
  395. it's provided and if UpdateBridgesFromAuthority is set too.
  396. **LearnCircuitBuildTimeout** **0**|**1**::
  397. If 0, CircuitBuildTimeout adaptive learning is disabled. (Default: 1)
  398. **CircuitBuildTimeout** __NUM__::
  399. Try for at most NUM seconds when building circuits. If the circuit isn't
  400. open in that time, give up on it. If LearnCircuitBuildTimeout is 1, this
  401. value serves as the initial value to use before a timeout is learned. If
  402. LearnCircuitBuildTimeout is 0, this value is the only value used.
  403. (Default: 60 seconds.)
  404. **CircuitIdleTimeout** __NUM__::
  405. If we have kept a clean (never used) circuit around for NUM seconds, then
  406. close it. This way when the Tor client is entirely idle, it can expire all
  407. of its circuits, and then expire its TLS connections. Also, if we end up
  408. making a circuit that is not useful for exiting any of the requests we're
  409. receiving, it won't forever take up a slot in the circuit list. (Default: 1
  410. hour.)
  411. **CircuitStreamTimeout** __NUM__::
  412. If non-zero, this option overrides our internal timeout schedule for how
  413. many seconds until we detach a stream from a circuit and try a new circuit.
  414. If your network is particularly slow, you might want to set this to a
  415. number like 60. (Default: 0)
  416. **ClientOnly** **0**|**1**::
  417. If set to 1, Tor will under no circumstances run as a relay or serve
  418. directory requests. This config option is mostly meaningless: we
  419. added it back when we were considering having Tor clients auto-promote
  420. themselves to being relays if they were stable and fast enough. The
  421. current behavior is simply that Tor is a client unless ORPort or
  422. DirPort are configured. (Default: 0)
  423. **ExcludeNodes** __node__,__node__,__...__::
  424. A list of identity fingerprints, nicknames, country codes and address
  425. patterns of nodes to avoid when building a circuit.
  426. (Example:
  427. ExcludeNodes SlowServer, ABCD1234CDEF5678ABCD1234CDEF5678ABCD1234, \{cc}, 255.254.0.0/8) +
  428. +
  429. By default, this option is treated as a preference that Tor is allowed
  430. to override in order to keep working.
  431. For example, if you try to connect to a hidden service,
  432. but you have excluded all of the hidden service's introduction points,
  433. Tor will connect to one of them anyway. If you do not want this
  434. behavior, set the StrictNodes option (documented below). +
  435. +
  436. Note also that if you are a relay, this (and the other node selection
  437. options below) only affects your own circuits that Tor builds for you.
  438. Clients can still build circuits through you to any node. Controllers
  439. can tell Tor to build circuits through any node.
  440. **ExcludeExitNodes** __node__,__node__,__...__::
  441. A list of identity fingerprints, nicknames, country codes and address
  442. patterns of nodes to never use when picking an exit node---that is, a
  443. node that delivers traffic for you outside the Tor network. Note that any
  444. node listed in ExcludeNodes is automatically considered to be part of this
  445. list too. See also the caveats on the "ExitNodes" option below.
  446. **ExitNodes** __node__,__node__,__...__::
  447. A list of identity fingerprints, nicknames, country codes and address
  448. patterns of nodes to use as exit node---that is, a
  449. node that delivers traffic for you outside the Tor network. +
  450. +
  451. Note that if you list too few nodes here, or if you exclude too many exit
  452. nodes with ExcludeExitNodes, you can degrade functionality. For example,
  453. if none of the exits you list allows traffic on port 80 or 443, you won't
  454. be able to browse the web. +
  455. +
  456. Note also that not every circuit is used to deliver traffic outside of
  457. the Tor network. It is normal to see non-exit circuits (such as those
  458. used to connect to hidden services, those that do directory fetches,
  459. those used for relay reachability self-tests, and so on) that end
  460. at a non-exit node. To
  461. keep a node from being used entirely, see ExcludeNodes and StrictNodes. +
  462. +
  463. The ExcludeNodes option overrides this option: any node listed in both
  464. ExitNodes and ExcludeNodes is treated as excluded. +
  465. +
  466. The .exit address notation, if enabled via AllowDotExit, overrides
  467. this option.
  468. **EntryNodes** __node__,__node__,__...__::
  469. A list of identity fingerprints and nicknames of nodes
  470. to use for the first hop in your normal circuits. (Country codes and
  471. address patterns are not yet supported.) Normal circuits include all
  472. circuits except for direct connections to directory servers. The Bridge
  473. option overrides this option; if you have configured bridges and
  474. UseBridges is 1, the Bridges are used as your entry nodes. +
  475. +
  476. The ExcludeNodes option overrides this option: any node listed in both
  477. EntryNodes and ExcludeNodes is treated as excluded.
  478. **StrictNodes** **0**|**1**::
  479. If StrictNodes is set to 1, Tor will treat the ExcludeNodes option as a
  480. requirement to follow for all the circuits you generate, even if doing so
  481. will break functionality for you. If StrictNodes is set to 0, Tor will
  482. still try to avoid nodes in the ExcludeNodes list, but it will err on the
  483. side of avoiding unexpected errors. Specifically, StrictNodes 0 tells
  484. Tor that it is okay to use an excluded node when it is *necessary* to
  485. perform relay reachability self-tests, connect to
  486. a hidden service, provide a hidden service to a client, fulfill a .exit
  487. request, upload directory information, or download directory information.
  488. (Default: 0)
  489. **FascistFirewall** **0**|**1**::
  490. If 1, Tor will only create outgoing connections to ORs running on ports
  491. that your firewall allows (defaults to 80 and 443; see **FirewallPorts**).
  492. This will allow you to run Tor as a client behind a firewall with
  493. restrictive policies, but will not allow you to run as a server behind such
  494. a firewall. If you prefer more fine-grained control, use
  495. ReachableAddresses instead.
  496. **FirewallPorts** __PORTS__::
  497. A list of ports that your firewall allows you to connect to. Only used when
  498. **FascistFirewall** is set. This option is deprecated; use ReachableAddresses
  499. instead. (Default: 80, 443)
  500. **HidServAuth** __onion-address__ __auth-cookie__ [__service-name__]::
  501. Client authorization for a hidden service. Valid onion addresses contain 16
  502. characters in a-z2-7 plus ".onion", and valid auth cookies contain 22
  503. characters in A-Za-z0-9+/. The service name is only used for internal
  504. purposes, e.g., for Tor controllers. This option may be used multiple times
  505. for different hidden services. If a hidden service uses authorization and
  506. this option is not set, the hidden service is not accessible. Hidden
  507. services can be configured to require authorization using the
  508. **HiddenServiceAuthorizeClient** option.
  509. **ReachableAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  510. A comma-separated list of IP addresses and ports that your firewall allows
  511. you to connect to. The format is as for the addresses in ExitPolicy, except
  512. that "accept" is understood unless "reject" is explicitly provided. For
  513. example, \'ReachableAddresses 99.0.0.0/8, reject 18.0.0.0/8:80, accept
  514. \*:80' means that your firewall allows connections to everything inside net
  515. 99, rejects port 80 connections to net 18, and accepts connections to port
  516. 80 otherwise. (Default: \'accept \*:*'.)
  517. **ReachableDirAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  518. Like **ReachableAddresses**, a list of addresses and ports. Tor will obey
  519. these restrictions when fetching directory information, using standard HTTP
  520. GET requests. If not set explicitly then the value of
  521. **ReachableAddresses** is used. If **HTTPProxy** is set then these
  522. connections will go through that proxy.
  523. **ReachableORAddresses** __ADDR__[/__MASK__][:__PORT__]...::
  524. Like **ReachableAddresses**, a list of addresses and ports. Tor will obey
  525. these restrictions when connecting to Onion Routers, using TLS/SSL. If not
  526. set explicitly then the value of **ReachableAddresses** is used. If
  527. **HTTPSProxy** is set then these connections will go through that proxy. +
  528. +
  529. The separation between **ReachableORAddresses** and
  530. **ReachableDirAddresses** is only interesting when you are connecting
  531. through proxies (see **HTTPProxy** and **HTTPSProxy**). Most proxies limit
  532. TLS connections (which Tor uses to connect to Onion Routers) to port 443,
  533. and some limit HTTP GET requests (which Tor uses for fetching directory
  534. information) to port 80.
  535. **LongLivedPorts** __PORTS__::
  536. A list of ports for services that tend to have long-running connections
  537. (e.g. chat and interactive shells). Circuits for streams that use these
  538. ports will contain only high-uptime nodes, to reduce the chance that a node
  539. will go down before the stream is finished. (Default: 21, 22, 706, 1863,
  540. 5050, 5190, 5222, 5223, 6667, 6697, 8300)
  541. **MapAddress** __address__ __newaddress__::
  542. When a request for address arrives to Tor, it will rewrite it to newaddress
  543. before processing it. For example, if you always want connections to
  544. www.indymedia.org to exit via __torserver__ (where __torserver__ is the
  545. nickname of the server), use "MapAddress www.indymedia.org
  546. www.indymedia.org.torserver.exit".
  547. **NewCircuitPeriod** __NUM__::
  548. Every NUM seconds consider whether to build a new circuit. (Default: 30
  549. seconds)
  550. **MaxCircuitDirtiness** __NUM__::
  551. Feel free to reuse a circuit that was first used at most NUM seconds ago,
  552. but never attach a new stream to a circuit that is too old. For hidden
  553. services, this applies to the __last__ time a circuit was used, not the
  554. first. (Default: 10 minutes)
  555. **NodeFamily** __node__,__node__,__...__::
  556. The Tor servers, defined by their identity fingerprints or nicknames,
  557. constitute a "family" of similar or co-administered servers, so never use
  558. any two of them in the same circuit. Defining a NodeFamily is only needed
  559. when a server doesn't list the family itself (with MyFamily). This option
  560. can be used multiple times.
  561. **EnforceDistinctSubnets** **0**|**1**::
  562. If 1, Tor will not put two servers whose IP addresses are "too close" on
  563. the same circuit. Currently, two addresses are "too close" if they lie in
  564. the same /16 range. (Default: 1)
  565. **SocksPort** __PORT__|**auto**::
  566. Advertise this port to listen for connections from Socks-speaking
  567. applications. Set this to 0 if you don't want to allow application
  568. connections via SOCKS. Set it to "auto" to have Tor pick a port for
  569. you. (Default: 9050)
  570. **SocksListenAddress** __IP__[:__PORT__]::
  571. Bind to this address to listen for connections from Socks-speaking
  572. applications. (Default: 127.0.0.1) You can also specify a port (e.g.
  573. 192.168.0.1:9100). This directive can be specified multiple times to bind
  574. to multiple addresses/ports.
  575. **SocksPolicy** __policy__,__policy__,__...__::
  576. Set an entrance policy for this server, to limit who can connect to the
  577. SocksPort and DNSPort ports. The policies have the same form as exit
  578. policies below.
  579. **SocksTimeout** __NUM__::
  580. Let a socks connection wait NUM seconds handshaking, and NUM seconds
  581. unattached waiting for an appropriate circuit, before we fail it. (Default:
  582. 2 minutes.)
  583. **TrackHostExits** __host__,__.domain__,__...__::
  584. For each value in the comma separated list, Tor will track recent
  585. connections to hosts that match this value and attempt to reuse the same
  586. exit node for each. If the value is prepended with a \'.\', it is treated as
  587. matching an entire domain. If one of the values is just a \'.', it means
  588. match everything. This option is useful if you frequently connect to sites
  589. that will expire all your authentication cookies (i.e. log you out) if
  590. your IP address changes. Note that this option does have the disadvantage
  591. of making it more clear that a given history is associated with a single
  592. user. However, most people who would wish to observe this will observe it
  593. through cookies or other protocol-specific means anyhow.
  594. **TrackHostExitsExpire** __NUM__::
  595. Since exit servers go up and down, it is desirable to expire the
  596. association between host and exit server after NUM seconds. The default is
  597. 1800 seconds (30 minutes).
  598. **UpdateBridgesFromAuthority** **0**|**1**::
  599. When set (along with UseBridges), Tor will try to fetch bridge descriptors
  600. from the configured bridge authorities when feasible. It will fall back to
  601. a direct request if the authority responds with a 404. (Default: 0)
  602. **UseBridges** **0**|**1**::
  603. When set, Tor will fetch descriptors for each bridge listed in the "Bridge"
  604. config lines, and use these relays as both entry guards and directory
  605. guards. (Default: 0)
  606. **UseEntryGuards** **0**|**1**::
  607. If this option is set to 1, we pick a few long-term entry servers, and try
  608. to stick with them. This is desirable because constantly changing servers
  609. increases the odds that an adversary who owns some servers will observe a
  610. fraction of your paths. (Defaults to 1.)
  611. **NumEntryGuards** __NUM__::
  612. If UseEntryGuards is set to 1, we will try to pick a total of NUM routers
  613. as long-term entries for our circuits. (Defaults to 3.)
  614. **SafeSocks** **0**|**1**::
  615. When this option is enabled, Tor will reject application connections that
  616. use unsafe variants of the socks protocol -- ones that only provide an IP
  617. address, meaning the application is doing a DNS resolve first.
  618. Specifically, these are socks4 and socks5 when not doing remote DNS.
  619. (Defaults to 0.)
  620. **TestSocks** **0**|**1**::
  621. When this option is enabled, Tor will make a notice-level log entry for
  622. each connection to the Socks port indicating whether the request used a
  623. safe socks protocol or an unsafe one (see above entry on SafeSocks). This
  624. helps to determine whether an application using Tor is possibly leaking
  625. DNS requests. (Default: 0)
  626. **WarnUnsafeSocks** **0**|**1**::
  627. When this option is enabled, Tor will warn whenever a request is
  628. received that only contains an IP address instead of a hostname. Allowing
  629. applications to do DNS resolves themselves is usually a bad idea and
  630. can leak your location to attackers. (Default: 1)
  631. **VirtualAddrNetwork** __Address__/__bits__::
  632. When Tor needs to assign a virtual (unused) address because of a MAPADDRESS
  633. command from the controller or the AutomapHostsOnResolve feature, Tor
  634. picks an unassigned address from this range. (Default:
  635. 127.192.0.0/10) +
  636. +
  637. When providing proxy server service to a network of computers using a tool
  638. like dns-proxy-tor, change this address to "10.192.0.0/10" or
  639. "172.16.0.0/12". The default **VirtualAddrNetwork** address range on a
  640. properly configured machine will route to the loopback interface. For
  641. local use, no change to the default VirtualAddrNetwork setting is needed.
  642. **AllowNonRFC953Hostnames** **0**|**1**::
  643. When this option is disabled, Tor blocks hostnames containing illegal
  644. characters (like @ and :) rather than sending them to an exit node to be
  645. resolved. This helps trap accidental attempts to resolve URLs and so on.
  646. (Default: 0)
  647. **AllowDotExit** **0**|**1**::
  648. If enabled, we convert "www.google.com.foo.exit" addresses on the
  649. SocksPort/TransPort/NATDPort into "www.google.com" addresses that exit from
  650. the node "foo". Disabled by default since attacking websites and exit
  651. relays can use it to manipulate your path selection. (Default: 0)
  652. **FastFirstHopPK** **0**|**1**::
  653. When this option is disabled, Tor uses the public key step for the first
  654. hop of creating circuits. Skipping it is generally safe since we have
  655. already used TLS to authenticate the relay and to establish forward-secure
  656. keys. Turning this option off makes circuit building slower. +
  657. +
  658. Note that Tor will always use the public key step for the first hop if it's
  659. operating as a relay, and it will never use the public key step if it
  660. doesn't yet know the onion key of the first hop. (Default: 1)
  661. **TransPort** __PORT__|**auto**::
  662. If non-zero, enables transparent proxy support on __PORT__ (by convention,
  663. 9040). Requires OS support for transparent proxies, such as BSDs' pf or
  664. Linux's IPTables. If you're planning to use Tor as a transparent proxy for
  665. a network, you'll want to examine and change VirtualAddrNetwork from the
  666. default setting. You'll also want to set the TransListenAddress option for
  667. the network you'd like to proxy. Set it to "auto" to have Tor pick a
  668. port for you. (Default: 0).
  669. **TransListenAddress** __IP__[:__PORT__]::
  670. Bind to this address to listen for transparent proxy connections. (Default:
  671. 127.0.0.1). This is useful for exporting a transparent proxy server to an
  672. entire network.
  673. **NATDPort** __PORT__|**auto**::
  674. Allow old versions of ipfw (as included in old versions of FreeBSD, etc.)
  675. to send connections through Tor using the NATD protocol. This option is
  676. only for people who cannot use TransPort. Set it to "auto" to have Tor
  677. pick a port for you. (Default: 0)
  678. **NATDListenAddress** __IP__[:__PORT__]::
  679. Bind to this address to listen for NATD connections. (Default: 127.0.0.1).
  680. **AutomapHostsOnResolve** **0**|**1**::
  681. When this option is enabled, and we get a request to resolve an address
  682. that ends with one of the suffixes in **AutomapHostsSuffixes**, we map an
  683. unused virtual address to that address, and return the new virtual address.
  684. This is handy for making ".onion" addresses work with applications that
  685. resolve an address and then connect to it. (Default: 0).
  686. **AutomapHostsSuffixes** __SUFFIX__,__SUFFIX__,__...__::
  687. A comma-separated list of suffixes to use with **AutomapHostsOnResolve**.
  688. The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).
  689. **DNSPort** __PORT__|**auto**::
  690. If non-zero, Tor listens for UDP DNS requests on this port and resolves
  691. them anonymously. Set it to "auto" to have Tor pick a port for
  692. you. (Default: 0).
  693. **DNSListenAddress** __IP__[:__PORT__]::
  694. Bind to this address to listen for DNS connections. (Default: 127.0.0.1).
  695. **ClientDNSRejectInternalAddresses** **0**|**1**::
  696. If true, Tor does not believe any anonymously retrieved DNS answer that
  697. tells it that an address resolves to an internal address (like 127.0.0.1 or
  698. 192.168.0.1). This option prevents certain browser-based attacks; don't
  699. turn it off unless you know what you're doing. (Default: 1).
  700. **ClientRejectInternalAddresses** **0**|**1**::
  701. If true, Tor does not try to fulfill requests to connect to an internal
  702. address (like 127.0.0.1 or 192.168.0.1) __unless a exit node is
  703. specifically requested__ (for example, via a .exit hostname, or a
  704. controller request). (Default: 1).
  705. **DownloadExtraInfo** **0**|**1**::
  706. If true, Tor downloads and caches "extra-info" documents. These documents
  707. contain information about servers other than the information in their
  708. regular router descriptors. Tor does not use this information for anything
  709. itself; to save bandwidth, leave this option turned off. (Default: 0).
  710. **FallbackNetworkstatusFile** __FILENAME__::
  711. If Tor doesn't have a cached networkstatus file, it starts out using this
  712. one instead. Even if this file is out of date, Tor can still use it to
  713. learn about directory mirrors, so it doesn't need to put load on the
  714. authorities. (Default: None).
  715. **WarnPlaintextPorts** __port__,__port__,__...__::
  716. Tells Tor to issue a warnings whenever the user tries to make an anonymous
  717. connection to one of these ports. This option is designed to alert users
  718. to services that risk sending passwords in the clear. (Default:
  719. 23,109,110,143).
  720. **RejectPlaintextPorts** __port__,__port__,__...__::
  721. Like WarnPlaintextPorts, but instead of warning about risky port uses, Tor
  722. will instead refuse to make the connection. (Default: None).
  723. **AllowSingleHopCircuits** **0**|**1**::
  724. When this option is set, the attached Tor controller can use relays
  725. that have the **AllowSingleHopExits** option turned on to build
  726. one-hop Tor connections. (Default: 0)
  727. SERVER OPTIONS
  728. --------------
  729. The following options are useful only for servers (that is, if ORPort
  730. is non-zero):
  731. **Address** __address__::
  732. The IP address or fully qualified domain name of this server (e.g.
  733. moria.mit.edu). You can leave this unset, and Tor will guess your IP
  734. address. This IP address is the one used to tell clients and other
  735. servers where to find your Tor server; it doesn't affect the IP that your
  736. Tor client binds to. To bind to a different address, use the
  737. *ListenAddress and OutboundBindAddress options.
  738. **AllowSingleHopExits** **0**|**1**::
  739. This option controls whether clients can use this server as a single hop
  740. proxy. If set to 1, clients can use this server as an exit even if it is
  741. the only hop in the circuit. Note that most clients will refuse to use
  742. servers that set this option, since most clients have
  743. ExcludeSingleHopRelays set. (Default: 0)
  744. **AssumeReachable** **0**|**1**::
  745. This option is used when bootstrapping a new Tor network. If set to 1,
  746. don't do self-reachability testing; just upload your server descriptor
  747. immediately. If **AuthoritativeDirectory** is also set, this option
  748. instructs the dirserver to bypass remote reachability testing too and list
  749. all connected servers as running.
  750. **BridgeRelay** **0**|**1**::
  751. Sets the relay to act as a "bridge" with respect to relaying connections
  752. from bridge users to the Tor network. It mainly causes Tor to publish a
  753. server descriptor to the bridge database, rather than publishing a relay
  754. descriptor to the public directory authorities.
  755. **ContactInfo** __email_address__::
  756. Administrative contact information for server. This line might get picked
  757. up by spam harvesters, so you may want to obscure the fact that it's an
  758. email address.
  759. **ExitPolicy** __policy__,__policy__,__...__::
  760. Set an exit policy for this server. Each policy is of the form
  761. "**accept**|**reject** __ADDR__[/__MASK__][:__PORT__]". If /__MASK__ is
  762. omitted then this policy just applies to the host given. Instead of giving
  763. a host or network you can also use "\*" to denote the universe (0.0.0.0/0).
  764. __PORT__ can be a single port number, an interval of ports
  765. "__FROM_PORT__-__TO_PORT__", or "\*". If __PORT__ is omitted, that means
  766. "\*". +
  767. +
  768. For example, "accept 18.7.22.69:\*,reject 18.0.0.0/8:\*,accept \*:\*" would
  769. reject any traffic destined for MIT except for web.mit.edu, and accept
  770. anything else. +
  771. +
  772. To specify all internal and link-local networks (including 0.0.0.0/8,
  773. 169.254.0.0/16, 127.0.0.0/8, 192.168.0.0/16, 10.0.0.0/8, and
  774. 172.16.0.0/12), you can use the "private" alias instead of an address.
  775. These addresses are rejected by default (at the beginning of your exit
  776. policy), along with your public IP address, unless you set the
  777. ExitPolicyRejectPrivate config option to 0. For example, once you've done
  778. that, you could allow HTTP to 127.0.0.1 and block all other connections to
  779. internal networks with "accept 127.0.0.1:80,reject private:\*", though that
  780. may also allow connections to your own computer that are addressed to its
  781. public (external) IP address. See RFC 1918 and RFC 3330 for more details
  782. about internal and reserved IP address space. +
  783. +
  784. This directive can be specified multiple times so you don't have to put it
  785. all on one line. +
  786. +
  787. Policies are considered first to last, and the first match wins. If you
  788. want to \_replace_ the default exit policy, end your exit policy with
  789. either a reject \*:* or an accept \*:*. Otherwise, you're \_augmenting_
  790. (prepending to) the default exit policy. The default exit policy is: +
  791. reject *:25
  792. reject *:119
  793. reject *:135-139
  794. reject *:445
  795. reject *:563
  796. reject *:1214
  797. reject *:4661-4666
  798. reject *:6346-6429
  799. reject *:6699
  800. reject *:6881-6999
  801. accept *:*
  802. **ExitPolicyRejectPrivate** **0**|**1**::
  803. Reject all private (local) networks, along with your own public IP address,
  804. at the beginning of your exit policy. See above entry on ExitPolicy.
  805. (Default: 1)
  806. **MaxOnionsPending** __NUM__::
  807. If you have more than this number of onionskins queued for decrypt, reject
  808. new ones. (Default: 100)
  809. **MyFamily** __node__,__node__,__...__::
  810. Declare that this Tor server is controlled or administered by a group or
  811. organization identical or similar to that of the other servers, defined by
  812. their identity fingerprints or nicknames. When two servers both declare
  813. that they are in the same \'family', Tor clients will not use them in the
  814. same circuit. (Each server only needs to list the other servers in its
  815. family; it doesn't need to list itself, but it won't hurt.)
  816. **Nickname** __name__::
  817. Set the server's nickname to \'name'. Nicknames must be between 1 and 19
  818. characters inclusive, and must contain only the characters [a-zA-Z0-9].
  819. **NumCPUs** __num__::
  820. How many processes to use at once for decrypting onionskins. (Default: 1)
  821. **ORPort** __PORT__|**auto**::
  822. Advertise this port to listen for connections from Tor clients and
  823. servers. This option is required to be a Tor server.
  824. Set it to "auto" to have Tor pick a port for you. (Default: 0).
  825. **ORListenAddress** __IP__[:__PORT__]::
  826. Bind to this IP address to listen for connections from Tor clients and
  827. servers. If you specify a port, bind to this port rather than the one
  828. specified in ORPort. (Default: 0.0.0.0) This directive can be specified
  829. multiple times to bind to multiple addresses/ports.
  830. **PublishServerDescriptor** **0**|**1**|**v1**|**v2**|**v3**|**bridge**,**...**::
  831. This option specifies which descriptors Tor will publish when acting as
  832. a relay. You can
  833. choose multiple arguments, separated by commas.
  834. +
  835. If this option is set to 0, Tor will not publish its
  836. descriptors to any directories. (This is useful if you're testing
  837. out your server, or if you're using a Tor controller that handles directory
  838. publishing for you.) Otherwise, Tor will publish its descriptors of all
  839. type(s) specified. The default is "1",
  840. which means "if running as a server, publish the
  841. appropriate descriptors to the authorities".
  842. **ShutdownWaitLength** __NUM__::
  843. When we get a SIGINT and we're a server, we begin shutting down:
  844. we close listeners and start refusing new circuits. After **NUM**
  845. seconds, we exit. If we get a second SIGINT, we exit immedi-
  846. ately. (Default: 30 seconds)
  847. **AccountingMax** __N__ **bytes**|**KB**|**MB**|**GB**|**TB**::
  848. Never send more than the specified number of bytes in a given accounting
  849. period, or receive more than that number in the period. For example, with
  850. AccountingMax set to 1 GB, a server could send 900 MB and receive 800 MB
  851. and continue running. It will only hibernate once one of the two reaches 1
  852. GB. When the number of bytes gets low, Tor will stop accepting new
  853. connections and circuits. When the number of bytes
  854. is exhausted, Tor will hibernate until some
  855. time in the next accounting period. To prevent all servers from waking at
  856. the same time, Tor will also wait until a random point in each period
  857. before waking up. If you have bandwidth cost issues, enabling hibernation
  858. is preferable to setting a low bandwidth, since it provides users with a
  859. collection of fast servers that are up some of the time, which is more
  860. useful than a set of slow servers that are always "available".
  861. **AccountingStart** **day**|**week**|**month** [__day__] __HH:MM__::
  862. Specify how long accounting periods last. If **month** is given, each
  863. accounting period runs from the time __HH:MM__ on the __dayth__ day of one
  864. month to the same day and time of the next. (The day must be between 1 and
  865. 28.) If **week** is given, each accounting period runs from the time __HH:MM__
  866. of the __dayth__ day of one week to the same day and time of the next week,
  867. with Monday as day 1 and Sunday as day 7. If **day** is given, each
  868. accounting period runs from the time __HH:MM__ each day to the same time on
  869. the next day. All times are local, and given in 24-hour time. (Defaults to
  870. "month 1 0:00".)
  871. **RefuseUnknownExits** **0**|**1**|**auto**::
  872. Prevent nodes that don't appear in the consensus from exiting using this
  873. relay. If the option is 1, we always block exit attempts from such
  874. nodes; if it's 0, we never do, and if the option is "auto", then we do
  875. whatever the authorities suggest in the consensus. (Defaults to auto.)
  876. **ServerDNSResolvConfFile** __filename__::
  877. Overrides the default DNS configuration with the configuration in
  878. __filename__. The file format is the same as the standard Unix
  879. "**resolv.conf**" file (7). This option, like all other ServerDNS options,
  880. only affects name lookups that your server does on behalf of clients.
  881. (Defaults to use the system DNS configuration.)
  882. **ServerDNSAllowBrokenConfig** **0**|**1**::
  883. If this option is false, Tor exits immediately if there are problems
  884. parsing the system DNS configuration or connecting to nameservers.
  885. Otherwise, Tor continues to periodically retry the system nameservers until
  886. it eventually succeeds. (Defaults to "1".)
  887. **ServerDNSSearchDomains** **0**|**1**::
  888. If set to 1, then we will search for addresses in the local search domain.
  889. For example, if this system is configured to believe it is in
  890. "example.com", and a client tries to connect to "www", the client will be
  891. connected to "www.example.com". This option only affects name lookups that
  892. your server does on behalf of clients. (Defaults to "0".)
  893. **ServerDNSDetectHijacking** **0**|**1**::
  894. When this option is set to 1, we will test periodically to determine
  895. whether our local nameservers have been configured to hijack failing DNS
  896. requests (usually to an advertising site). If they are, we will attempt to
  897. correct this. This option only affects name lookups that your server does
  898. on behalf of clients. (Defaults to "1".)
  899. **ServerDNSTestAddresses** __address__,__address__,__...__::
  900. When we're detecting DNS hijacking, make sure that these __valid__ addresses
  901. aren't getting redirected. If they are, then our DNS is completely useless,
  902. and we'll reset our exit policy to "reject *:*". This option only affects
  903. name lookups that your server does on behalf of clients. (Defaults to
  904. "www.google.com, www.mit.edu, www.yahoo.com, www.slashdot.org".)
  905. **ServerDNSAllowNonRFC953Hostnames** **0**|**1**::
  906. When this option is disabled, Tor does not try to resolve hostnames
  907. containing illegal characters (like @ and :) rather than sending them to an
  908. exit node to be resolved. This helps trap accidental attempts to resolve
  909. URLs and so on. This option only affects name lookups that your server does
  910. on behalf of clients. (Default: 0)
  911. **BridgeRecordUsageByCountry** **0**|**1**::
  912. When this option is enabled and BridgeRelay is also enabled, and we have
  913. GeoIP data, Tor keeps a keep a per-country count of how many client
  914. addresses have contacted it so that it can help the bridge authority guess
  915. which countries have blocked access to it. (Default: 1)
  916. **ServerDNSRandomizeCase** **0**|**1**::
  917. When this option is set, Tor sets the case of each character randomly in
  918. outgoing DNS requests, and makes sure that the case matches in DNS replies.
  919. This so-called "0x20 hack" helps resist some types of DNS poisoning attack.
  920. For more information, see "Increased DNS Forgery Resistance through
  921. 0x20-Bit Encoding". This option only affects name lookups that your server
  922. does on behalf of clients. (Default: 1)
  923. **GeoIPFile** __filename__::
  924. A filename containing GeoIP data, for use with BridgeRecordUsageByCountry.
  925. **CellStatistics** **0**|**1**::
  926. When this option is enabled, Tor writes statistics on the mean time that
  927. cells spend in circuit queues to disk every 24 hours. (Default: 0)
  928. **DirReqStatistics** **0**|**1**::
  929. When this option is enabled, Tor writes statistics on the number and
  930. response time of network status requests to disk every 24 hours.
  931. (Default: 0)
  932. **EntryStatistics** **0**|**1**::
  933. When this option is enabled, Tor writes statistics on the number of
  934. directly connecting clients to disk every 24 hours. (Default: 0)
  935. **ExitPortStatistics** **0**|**1**::
  936. When this option is enabled, Tor writes statistics on the number of relayed
  937. bytes and opened stream per exit port to disk every 24 hours. (Default: 0)
  938. **ExtraInfoStatistics** **0**|**1**::
  939. When this option is enabled, Tor includes previously gathered statistics in
  940. its extra-info documents that it uploads to the directory authorities.
  941. (Default: 0)
  942. DIRECTORY SERVER OPTIONS
  943. ------------------------
  944. The following options are useful only for directory servers (that is,
  945. if DirPort is non-zero):
  946. **AuthoritativeDirectory** **0**|**1**::
  947. When this option is set to 1, Tor operates as an authoritative directory
  948. server. Instead of caching the directory, it generates its own list of
  949. good servers, signs it, and sends that to the clients. Unless the clients
  950. already have you listed as a trusted directory, you probably do not want
  951. to set this option. Please coordinate with the other admins at
  952. tor-ops@torproject.org if you think you should be a directory.
  953. **DirPortFrontPage** __FILENAME__::
  954. When this option is set, it takes an HTML file and publishes it as "/" on
  955. the DirPort. Now relay operators can provide a disclaimer without needing
  956. to set up a separate webserver. There's a sample disclaimer in
  957. contrib/tor-exit-notice.html.
  958. **V1AuthoritativeDirectory** **0**|**1**::
  959. When this option is set in addition to **AuthoritativeDirectory**, Tor
  960. generates version 1 directory and running-routers documents (for legacy
  961. Tor clients up to 0.1.0.x).
  962. **V2AuthoritativeDirectory** **0**|**1**::
  963. When this option is set in addition to **AuthoritativeDirectory**, Tor
  964. generates version 2 network statuses and serves descriptors, etc as
  965. described in doc/spec/dir-spec-v2.txt (for Tor clients and servers running
  966. 0.1.1.x and 0.1.2.x).
  967. **V3AuthoritativeDirectory** **0**|**1**::
  968. When this option is set in addition to **AuthoritativeDirectory**, Tor
  969. generates version 3 network statuses and serves descriptors, etc as
  970. described in doc/spec/dir-spec.txt (for Tor clients and servers running at
  971. least 0.2.0.x).
  972. **VersioningAuthoritativeDirectory** **0**|**1**::
  973. When this option is set to 1, Tor adds information on which versions of
  974. Tor are still believed safe for use to the published directory. Each
  975. version 1 authority is automatically a versioning authority; version 2
  976. authorities provide this service optionally. See **RecommendedVersions**,
  977. **RecommendedClientVersions**, and **RecommendedServerVersions**.
  978. **NamingAuthoritativeDirectory** **0**|**1**::
  979. When this option is set to 1, then the server advertises that it has
  980. opinions about nickname-to-fingerprint bindings. It will include these
  981. opinions in its published network-status pages, by listing servers with
  982. the flag "Named" if a correct binding between that nickname and fingerprint
  983. has been registered with the dirserver. Naming dirservers will refuse to
  984. accept or publish descriptors that contradict a registered binding. See
  985. **approved-routers** in the **FILES** section below.
  986. **HSAuthoritativeDir** **0**|**1**::
  987. When this option is set in addition to **AuthoritativeDirectory**, Tor also
  988. accepts and serves v0 hidden service descriptors,
  989. which are produced and used by Tor 0.2.1.x and older. (Default: 0)
  990. **HidServDirectoryV2** **0**|**1**::
  991. When this option is set, Tor accepts and serves v2 hidden service
  992. descriptors. Setting DirPort is not required for this, because clients
  993. connect via the ORPort by default. (Default: 1)
  994. **BridgeAuthoritativeDir** **0**|**1**::
  995. When this option is set in addition to **AuthoritativeDirectory**, Tor
  996. accepts and serves router descriptors, but it caches and serves the main
  997. networkstatus documents rather than generating its own. (Default: 0)
  998. **MinUptimeHidServDirectoryV2** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  999. Minimum uptime of a v2 hidden service directory to be accepted as such by
  1000. authoritative directories. (Default: 25 hours)
  1001. **DirPort** __PORT__|**auto**::
  1002. If this option is nonzero, advertise the directory service on this port.
  1003. Set it to "auto" to have Tor pick a port for you. (Default: 0)
  1004. **DirListenAddress** __IP__[:__PORT__]::
  1005. Bind the directory service to this address. If you specify a port, bind to
  1006. this port rather than the one specified in DirPort. (Default: 0.0.0.0)
  1007. This directive can be specified multiple times to bind to multiple
  1008. addresses/ports.
  1009. **DirPolicy** __policy__,__policy__,__...__::
  1010. Set an entrance policy for this server, to limit who can connect to the
  1011. directory ports. The policies have the same form as exit policies above.
  1012. **FetchV2Networkstatus** **0**|**1**::
  1013. If set, we try to fetch the (obsolete, unused) version 2 network status
  1014. consensus documents from the directory authorities. No currently
  1015. supported Tor version uses them. (Default: 0.)
  1016. DIRECTORY AUTHORITY SERVER OPTIONS
  1017. ----------------------------------
  1018. **RecommendedVersions** __STRING__::
  1019. STRING is a comma-separated list of Tor versions currently believed to be
  1020. safe. The list is included in each directory, and nodes which pull down the
  1021. directory learn whether they need to upgrade. This option can appear
  1022. multiple times: the values from multiple lines are spliced together. When
  1023. this is set then **VersioningAuthoritativeDirectory** should be set too.
  1024. **RecommendedClientVersions** __STRING__::
  1025. STRING is a comma-separated list of Tor versions currently believed to be
  1026. safe for clients to use. This information is included in version 2
  1027. directories. If this is not set then the value of **RecommendedVersions**
  1028. is used. When this is set then **VersioningAuthoritativeDirectory** should
  1029. be set too.
  1030. **RecommendedServerVersions** __STRING__::
  1031. STRING is a comma-separated list of Tor versions currently believed to be
  1032. safe for servers to use. This information is included in version 2
  1033. directories. If this is not set then the value of **RecommendedVersions**
  1034. is used. When this is set then **VersioningAuthoritativeDirectory** should
  1035. be set too.
  1036. **ConsensusParams** __STRING__::
  1037. STRING is a space-separated list of key=value pairs that Tor will include
  1038. in the "params" line of its networkstatus vote.
  1039. **DirAllowPrivateAddresses** **0**|**1**::
  1040. If set to 1, Tor will accept router descriptors with arbitrary "Address"
  1041. elements. Otherwise, if the address is not an IP address or is a private IP
  1042. address, it will reject the router descriptor. Defaults to 0.
  1043. **AuthDirBadDir** __AddressPattern...__::
  1044. Authoritative directories only. A set of address patterns for servers that
  1045. will be listed as bad directories in any network status document this
  1046. authority publishes, if **AuthDirListBadDirs** is set.
  1047. **AuthDirBadExit** __AddressPattern...__::
  1048. Authoritative directories only. A set of address patterns for servers that
  1049. will be listed as bad exits in any network status document this authority
  1050. publishes, if **AuthDirListBadExits** is set.
  1051. **AuthDirInvalid** __AddressPattern...__::
  1052. Authoritative directories only. A set of address patterns for servers that
  1053. will never be listed as "valid" in any network status document that this
  1054. authority publishes.
  1055. **AuthDirReject** __AddressPattern__...::
  1056. Authoritative directories only. A set of address patterns for servers that
  1057. will never be listed at all in any network status document that this
  1058. authority publishes, or accepted as an OR address in any descriptor
  1059. submitted for publication by this authority.
  1060. **AuthDirListBadDirs** **0**|**1**::
  1061. Authoritative directories only. If set to 1, this directory has some
  1062. opinion about which nodes are unsuitable as directory caches. (Do not set
  1063. this to 1 unless you plan to list non-functioning directories as bad;
  1064. otherwise, you are effectively voting in favor of every declared
  1065. directory.)
  1066. **AuthDirListBadExits** **0**|**1**::
  1067. Authoritative directories only. If set to 1, this directory has some
  1068. opinion about which nodes are unsuitable as exit nodes. (Do not set this to
  1069. 1 unless you plan to list non-functioning exits as bad; otherwise, you are
  1070. effectively voting in favor of every declared exit as an exit.)
  1071. **AuthDirRejectUnlisted** **0**|**1**::
  1072. Authoritative directories only. If set to 1, the directory server rejects
  1073. all uploaded server descriptors that aren't explicitly listed in the
  1074. fingerprints file. This acts as a "panic button" if we get hit with a Sybil
  1075. attack. (Default: 0)
  1076. **AuthDirMaxServersPerAddr** __NUM__::
  1077. Authoritative directories only. The maximum number of servers that we will
  1078. list as acceptable on a single IP address. Set this to "0" for "no limit".
  1079. (Default: 2)
  1080. **AuthDirMaxServersPerAuthAddr** __NUM__::
  1081. Authoritative directories only. Like AuthDirMaxServersPerAddr, but applies
  1082. to addresses shared with directory authorities. (Default: 5)
  1083. **AuthDirFastGuarantee** __N__ **bytes**|**KB**|**MB**|**GB**::
  1084. Authoritative directories only. If non-zero, always vote the
  1085. Fast flag for any relay advertising this amount of capacity or
  1086. more. (Default: 20 KB)
  1087. **AuthDirGuardBWGuarantee** __N__ **bytes**|**KB**|**MB**|**GB**::
  1088. Authoritative directories only. If non-zero, this advertised capacity
  1089. or more is always sufficient to satisfy the bandwidth requirement
  1090. for the Guard flag. (Default: 250 KB)
  1091. **BridgePassword** __Password__::
  1092. If set, contains an HTTP authenticator that tells a bridge authority to
  1093. serve all requested bridge information. Used by the (only partially
  1094. implemented) "bridge community" design, where a community of bridge
  1095. relay operators all use an alternate bridge directory authority,
  1096. and their target user audience can periodically fetch the list of
  1097. available community bridges to stay up-to-date. (Default: not set.)
  1098. **V3AuthVotingInterval** __N__ **minutes**|**hours**::
  1099. V3 authoritative directories only. Configures the server's preferred voting
  1100. interval. Note that voting will __actually__ happen at an interval chosen
  1101. by consensus from all the authorities' preferred intervals. This time
  1102. SHOULD divide evenly into a day. (Default: 1 hour)
  1103. **V3AuthVoteDelay** __N__ **minutes**|**hours**::
  1104. V3 authoritative directories only. Configures the server's preferred delay
  1105. between publishing its vote and assuming it has all the votes from all the
  1106. other authorities. Note that the actual time used is not the server's
  1107. preferred time, but the consensus of all preferences. (Default: 5 minutes.)
  1108. **V3AuthDistDelay** __N__ **minutes**|**hours**::
  1109. V3 authoritative directories only. Configures the server's preferred delay
  1110. between publishing its consensus and signature and assuming it has all the
  1111. signatures from all the other authorities. Note that the actual time used
  1112. is not the server's preferred time, but the consensus of all preferences.
  1113. (Default: 5 minutes.)
  1114. **V3AuthNIntervalsValid** __NUM__::
  1115. V3 authoritative directories only. Configures the number of VotingIntervals
  1116. for which each consensus should be valid for. Choosing high numbers
  1117. increases network partitioning risks; choosing low numbers increases
  1118. directory traffic. Note that the actual number of intervals used is not the
  1119. server's preferred number, but the consensus of all preferences. Must be at
  1120. least 2. (Default: 3.)
  1121. **V3BandwidthsFile** __FILENAME__::
  1122. V3 authoritative directories only. Configures the location of the
  1123. bandiwdth-authority generated file storing information on relays' measured
  1124. bandwidth capacities. (Default: unset.)
  1125. **V3AuthUseLegacyKey** **0**|**1**::
  1126. If set, the directory authority will sign consensuses not only with its
  1127. own signing key, but also with a "legacy" key and certificate with a
  1128. different identity. This feature is used to migrate directory authority
  1129. keys in the event of a compromise. (Default: 0.)
  1130. **RephistTrackTime** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  1131. Tells an authority, or other node tracking node reliability and history,
  1132. that fine-grained information about nodes can be discarded when it hasn't
  1133. changed for a given amount of time. (Default: 24 hours)
  1134. **VoteOnHidServDirectoriesV2** **0**|**1**::
  1135. When this option is set in addition to **AuthoritativeDirectory**, Tor
  1136. votes on whether to accept relays as hidden service directories.
  1137. (Default: 1)
  1138. GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays **0**|**1**::
  1139. When this option is set to 0, do not vote to give the Guard flag to any
  1140. version of Tor vulnerable to CVE-2011-2769. (Default: 0)
  1141. HIDDEN SERVICE OPTIONS
  1142. ----------------------
  1143. The following options are used to configure a hidden service.
  1144. **HiddenServiceDir** __DIRECTORY__::
  1145. Store data files for a hidden service in DIRECTORY. Every hidden service
  1146. must have a separate directory. You may use this option multiple times to
  1147. specify multiple services. DIRECTORY must be an existing directory.
  1148. **HiddenServicePort** __VIRTPORT__ [__TARGET__]::
  1149. Configure a virtual port VIRTPORT for a hidden service. You may use this
  1150. option multiple times; each time applies to the service using the most
  1151. recent hiddenservicedir. By default, this option maps the virtual port to
  1152. the same port on 127.0.0.1. You may override the target port, address, or
  1153. both by specifying a target of addr, port, or addr:port. You may also have
  1154. multiple lines with the same VIRTPORT: when a user connects to that
  1155. VIRTPORT, one of the TARGETs from those lines will be chosen at random.
  1156. **PublishHidServDescriptors** **0**|**1**::
  1157. If set to 0, Tor will run any hidden services you configure, but it won't
  1158. advertise them to the rendezvous directory. This option is only useful if
  1159. you're using a Tor controller that handles hidserv publishing for you.
  1160. (Default: 1)
  1161. **HiddenServiceVersion** __version__,__version__,__...__::
  1162. A list of rendezvous service descriptor versions to publish for the hidden
  1163. service. Currently, only version 2 is supported. (Default: 2)
  1164. **HiddenServiceAuthorizeClient** __auth-type__ __client-name__,__client-name__,__...__::
  1165. If configured, the hidden service is accessible for authorized clients
  1166. only. The auth-type can either be \'basic' for a general-purpose
  1167. authorization protocol or \'stealth' for a less scalable protocol that also
  1168. hides service activity from unauthorized clients. Only clients that are
  1169. listed here are authorized to access the hidden service. Valid client names
  1170. are 1 to 19 characters long and only use characters in A-Za-z0-9+-_ (no
  1171. spaces). If this option is set, the hidden service is not accessible for
  1172. clients without authorization any more. Generated authorization data can be
  1173. found in the hostname file. Clients need to put this authorization data in
  1174. their configuration file using **HidServAuth**.
  1175. **RendPostPeriod** __N__ **seconds**|**minutes**|**hours**|**days**|**weeks**::
  1176. Every time the specified period elapses, Tor uploads any rendezvous
  1177. service descriptors to the directory servers. This information is also
  1178. uploaded whenever it changes. (Default: 1 hour)
  1179. TESTING NETWORK OPTIONS
  1180. -----------------------
  1181. The following options are used for running a testing Tor network.
  1182. **TestingTorNetwork** **0**|**1**::
  1183. If set to 1, Tor adjusts default values of the configuration options below,
  1184. so that it is easier to set up a testing Tor network. May only be set if
  1185. non-default set of DirServers is set. Cannot be unset while Tor is running.
  1186. (Default: 0) +
  1187. ServerDNSAllowBrokenConfig 1
  1188. DirAllowPrivateAddresses 1
  1189. EnforceDistinctSubnets 0
  1190. AssumeReachable 1
  1191. AuthDirMaxServersPerAddr 0
  1192. AuthDirMaxServersPerAuthAddr 0
  1193. ClientDNSRejectInternalAddresses 0
  1194. ClientRejectInternalAddresses 0
  1195. ExitPolicyRejectPrivate 0
  1196. V3AuthVotingInterval 5 minutes
  1197. V3AuthVoteDelay 20 seconds
  1198. V3AuthDistDelay 20 seconds
  1199. MinUptimeHidServDirectoryV2 0 seconds
  1200. TestingV3AuthInitialVotingInterval 5 minutes
  1201. TestingV3AuthInitialVoteDelay 20 seconds
  1202. TestingV3AuthInitialDistDelay 20 seconds
  1203. TestingAuthDirTimeToLearnReachability 0 minutes
  1204. TestingEstimatedDescriptorPropagationTime 0 minutes
  1205. **TestingV3AuthInitialVotingInterval** __N__ **minutes**|**hours**::
  1206. Like V3AuthVotingInterval, but for initial voting interval before the first
  1207. consensus has been created. Changing this requires that
  1208. **TestingTorNetwork** is set. (Default: 30 minutes)
  1209. **TestingV3AuthInitialVoteDelay** __N__ **minutes**|**hours**::
  1210. Like TestingV3AuthInitialVoteDelay, but for initial voting interval before
  1211. the first consensus has been created. Changing this requires that
  1212. **TestingTorNetwork** is set. (Default: 5 minutes)
  1213. **TestingV3AuthInitialDistDelay** __N__ **minutes**|**hours**::
  1214. Like TestingV3AuthInitialDistDelay, but for initial voting interval before
  1215. the first consensus has been created. Changing this requires that
  1216. **TestingTorNetwork** is set. (Default: 5 minutes)
  1217. **TestingAuthDirTimeToLearnReachability** __N__ **minutes**|**hours**::
  1218. After starting as an authority, do not make claims about whether routers
  1219. are Running until this much time has passed. Changing this requires
  1220. that **TestingTorNetwork** is set. (Default: 30 minutes)
  1221. **TestingEstimatedDescriptorPropagationTime** __N__ **minutes**|**hours**::
  1222. Clients try downloading router descriptors from directory caches after this
  1223. time. Changing this requires that **TestingTorNetwork** is set. (Default:
  1224. 10 minutes)
  1225. SIGNALS
  1226. -------
  1227. Tor catches the following signals:
  1228. **SIGTERM**::
  1229. Tor will catch this, clean up and sync to disk if necessary, and exit.
  1230. **SIGINT**::
  1231. Tor clients behave as with SIGTERM; but Tor servers will do a controlled
  1232. slow shutdown, closing listeners and waiting 30 seconds before exiting.
  1233. (The delay can be configured with the ShutdownWaitLength config option.)
  1234. **SIGHUP**::
  1235. The signal instructs Tor to reload its configuration (including closing and
  1236. reopening logs), and kill and restart its helper processes if applicable.
  1237. **SIGUSR1**::
  1238. Log statistics about current connections, past connections, and throughput.
  1239. **SIGUSR2**::
  1240. Switch all logs to loglevel debug. You can go back to the old loglevels by
  1241. sending a SIGHUP.
  1242. **SIGCHLD**::
  1243. Tor receives this signal when one of its helper processes has exited, so it
  1244. can clean up.
  1245. **SIGPIPE**::
  1246. Tor catches this signal and ignores it.
  1247. **SIGXFSZ**::
  1248. If this signal exists on your platform, Tor catches and ignores it.
  1249. FILES
  1250. -----
  1251. **@CONFDIR@/torrc**::
  1252. The configuration file, which contains "option value" pairs.
  1253. **@LOCALSTATEDIR@/lib/tor/**::
  1254. The tor process stores keys and other data here.
  1255. __DataDirectory__**/cached-status/**::
  1256. The most recently downloaded network status document for each authority.
  1257. Each file holds one such document; the filenames are the hexadecimal
  1258. identity key fingerprints of the directory authorities.
  1259. __DataDirectory__**/cached-descriptors** and **cached-descriptors.new**::
  1260. These files hold downloaded router statuses. Some routers may appear more
  1261. than once; if so, the most recently published descriptor is used. Lines
  1262. beginning with @-signs are annotations that contain more information about
  1263. a given router. The ".new" file is an append-only journal; when it gets
  1264. too large, all entries are merged into a new cached-descriptors file.
  1265. __DataDirectory__**/cached-routers** and **cached-routers.new**::
  1266. Obsolete versions of cached-descriptors and cached-descriptors.new. When
  1267. Tor can't find the newer files, it looks here instead.
  1268. __DataDirectory__**/state**::
  1269. A set of persistent key-value mappings. These are documented in
  1270. the file. These include:
  1271. - The current entry guards and their status.
  1272. - The current bandwidth accounting values (unused so far; see
  1273. below).
  1274. - When the file was last written
  1275. - What version of Tor generated the state file
  1276. - A short history of bandwidth usage, as produced in the router
  1277. descriptors.
  1278. __DataDirectory__**/bw_accounting**::
  1279. Used to track bandwidth accounting values (when the current period starts
  1280. and ends; how much has been read and written so far this period). This file
  1281. is obsolete, and the data is now stored in the \'state' file as well. Only
  1282. used when bandwidth accounting is enabled.
  1283. __DataDirectory__**/control_auth_cookie**::
  1284. Used for cookie authentication with the controller. Location can be
  1285. overridden by the CookieAuthFile config option. Regenerated on startup. See
  1286. control-spec.txt for details. Only used when cookie authentication is
  1287. enabled.
  1288. __DataDirectory__**/keys/***::
  1289. Only used by servers. Holds identity keys and onion keys.
  1290. __DataDirectory__**/fingerprint**::
  1291. Only used by servers. Holds the fingerprint of the server's identity key.
  1292. __DataDirectory__**/approved-routers**::
  1293. Only for naming authoritative directory servers (see
  1294. **NamingAuthoritativeDirectory**). This file lists nickname to identity
  1295. bindings. Each line lists a nickname and a fingerprint separated by
  1296. whitespace. See your **fingerprint** file in the __DataDirectory__ for an
  1297. example line. If the nickname is **!reject** then descriptors from the
  1298. given identity (fingerprint) are rejected by this server. If it is
  1299. **!invalid** then descriptors are accepted but marked in the directory as
  1300. not valid, that is, not recommended.
  1301. __DataDirectory__**/router-stability**::
  1302. Only used by authoritative directory servers. Tracks measurements for
  1303. router mean-time-between-failures so that authorities have a good idea of
  1304. how to set their Stable flags.
  1305. __HiddenServiceDirectory__**/hostname**::
  1306. The <base32-encoded-fingerprint>.onion domain name for this hidden service.
  1307. If the hidden service is restricted to authorized clients only, this file
  1308. also contains authorization data for all clients.
  1309. __HiddenServiceDirectory__**/private_key**::
  1310. The private key for this hidden service.
  1311. __HiddenServiceDirectory__**/client_keys**::
  1312. Authorization data for a hidden service that is only accessible by
  1313. authorized clients.
  1314. SEE ALSO
  1315. --------
  1316. **privoxy**(1), **tsocks**(1), **torify**(1) +
  1317. **https://www.torproject.org/**
  1318. BUGS
  1319. ----
  1320. Plenty, probably. Tor is still in development. Please report them.
  1321. AUTHORS
  1322. -------
  1323. Roger Dingledine [arma at mit.edu], Nick Mathewson [nickm at alum.mit.edu].