.TH TOR 1 "January 2006" "TOR" .SH NAME tor \- The second-generation onion router .SH SYNOPSIS .B tor [\fIOPTION value\fR]... .SH DESCRIPTION .I tor is a connection-oriented anonymizing communication service. Users choose a source-routed path through a set of nodes, and negotiate a "virtual circuit" through the network, in which each node knows its predecessor and successor, but no others. Traffic flowing down the circuit is unwrapped by a symmetric key at each node, which reveals the downstream node. .PP Basically \fItor\fR provides a distributed network of servers ("onion routers"). Users bounce their TCP streams -- web traffic, ftp, ssh, etc -- around the routers, and recipients, observers, and even the routers themselves have difficulty tracking the source of the stream. .SH OPTIONS \fB-h, -help\fP Display a short help message and exit. .LP .TP \fB-f \fR\fIFILE\fP FILE contains further "option value" pairs. (Default: @CONFDIR@/torrc) .LP .TP Other options can be specified either on the command-line (\fI--option value\fR), or in the configuration file (\fIoption value\fR). Options are case-insensitive. .LP .TP \fBBandwidthRate \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP A token bucket limits the average incoming bandwidth on this node to the specified number of bytes per second. (Default: 3 MB) .LP .TP \fBBandwidthBurst \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP Limit the maximum token bucket size (also known as the burst) to the given number of bytes. (Default: 6 MB) .LP .TP \fBMaxAdvertisedBandwidth \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP If set, we will not advertise more than this amount of bandwidth for our BandwidthRate. Server operators who want to reduce the number of clients who ask to build circuits through them (since this is proportional to advertised bandwidth rate) can thus reduce the CPU demands on their server without impacting network performance. .LP .TP \fBConnLimit \fR\fINUM\fP The minimum number of file descriptors that must be available to the Tor process before it will start. Tor will ask the OS for as many file descriptors as the OS will allow (you can find this by "ulimit -H -n"). If this number is less than ConnLimit, then Tor will refuse to start. You probably don't need to adjust this. It has no effect on Windows since that platform lacks getrlimit(). (Default: 1000) .LP .TP \fBControlPort \fR\fIPort\fP If set, Tor will accept connections on this port, and allow those connections to control the Tor process using the Tor Control Protocol (described in control-spec.txt). Note: unless you also specify one of \fBHashedControlPassword\fP or \fBCookieAuthentication\fP, setting this option will cause Tor to allow any process on the local host to control it. .LP .TP \fBControlListenAddress \fR\fIIP\fR[:\fIPORT\fR]\fP Bind the controller listener to this address. If you specify a port, bind to this port rather than the one specified in ControlPort. We strongly recommend that you leave this alone unless you know what you're doing, since giving attackers access to your control listener is really dangerous. (Default: 127.0.0.1) .LP .TP \fBHashedControlPassword \fR\fIhashed_password\fP Don't allow any connections on the control port except when the other process knows the password whose one-way hash is \fIhashed_password\fP. You can compute the hash of a password by running "tor --hash-password \fIpassword\fP". .LP .TP \fBCookieAuthentication \fR\fB0\fR|\fB1\fP If this option is set to 1, don't allow any connections on the control port except when the connecting process knows the contents of a file named "control_auth_cookie", which Tor will create in its data directory. This authentication methods should only be used on systems with good filesystem security. (Default: 0) .LP .TP \fBDataDirectory \fR\fIDIR\fP Store working data in DIR (Default: @LOCALSTATEDIR@/lib/tor) .LP .TP \fBDirServer \fR[\fInickname\fR] [\fBv1\fR] \fIaddress\fR\fB:\fIport fingerprint\fP Use a nonstandard authoritative directory server at the provided address and port, with the specified key fingerprint. This option can be repeated many times, for multiple authoritative directory servers. If the "v1" option is provided, Tor will use this server as an authority for old-style (v1) directories as well. (Only directory mirrors care about this.) If no \fBdirserver\fP line is given, Tor will use the default directory servers: moria1, moria2, and tor26. NOTE: this option is intended for setting up a private Tor network with its own directory authorities. If you use it, you will be distinguishable from other users, because you won't believe the same authorities they do. .LP .TP \fBFetchHidServDescriptors \fR\fB0\fR|\fB1\fR\fP If set to 0, Tor will never fetch any hidden service descriptors from the rendezvous directories. This option is only useful if you're using a Tor controller that handles hidserv fetches for you. (Default: 1) .LP .TP \fBFetchServerDescriptors \fR\fB0\fR|\fB1\fR\fP If set to 0, Tor will never fetch any network status summaries or server descriptors from the directory servers. This option is only useful if you're using a Tor controller that handles directory fetches for you. (Default: 1) .LP .TP \fBFetchUselessDescriptors \fR\fB0\fR|\fB1\fR\fP If set to 1, Tor will fetch every non-obsolete descriptor from the authorities that it hears about. Otherwise, it will avoid fetching useless descriptors, for example for routers that are not running. This option is useful if you're using the contributed "exitlist" script to enumerate Tor nodes that exit to certain addresses. (Default: 0) .LP .TP \fBGroup \fR\fIGID\fP On startup, setgid to this user. .LP .TP \fBHttpProxy\fR \fIhost\fR[:\fIport\fR]\fP Tor will make all its directory requests through this host:port (or host:80 if port is not specified), rather than connecting directly to any directory servers. .LP .TP \fBHttpProxyAuthenticator\fR \fIusername:password\fP If defined, Tor will use this username:password for Basic Http proxy authentication, as in RFC 2617. This is currently the only form of Http proxy authentication that Tor supports; feel free to submit a patch if you want it to support others. .LP .TP \fBHttpsProxy\fR \fIhost\fR[:\fIport\fR]\fP Tor will make all its OR (SSL) connections through this host:port (or host:443 if port is not specified), via HTTP CONNECT rather than connecting directly to servers. You may want to set \fBFascistFirewall\fR to restrict the set of ports you might try to connect to, if your Https proxy only allows connecting to certain ports. .LP .TP \fBHttpsProxyAuthenticator\fR \fIusername:password\fP If defined, Tor will use this username:password for Basic Https proxy authentication, as in RFC 2617. This is currently the only form of Https proxy authentication that Tor supports; feel free to submit a patch if you want it to support others. .LP .TP \fBKeepalivePeriod \fR\fINUM\fP To keep firewalls from expiring connections, send a padding keepalive cell every NUM seconds on open connections that are in use. If the connection has no open circuits, it will instead be closed after NUM seconds of idleness. (Default: 5 minutes) .LP .TP \fBLog \fR\fIminSeverity\fR[-\fImaxSeverity\fR] \fBstderr\fR|\fBstdout\fR|\fBsyslog\fR\fP Send all messages between \fIminSeverity\fR and \fImaxSeverity\fR to the standard output stream, the standard error stream, or to the system log. (The "syslog" value is only supported on Unix.) Recognized severity levels are debug, info, notice, warn, and err. We advise using "notice" in most cases, since anything more verbose may provide sensitive information to an attacker who obtains the logs. If only one severity level is given, all messages of that level or higher will be sent to the listed destination. .LP .TP \fBLog \fR\fIminSeverity\fR[-\fImaxSeverity\fR] \fBfile\fR \fIFILENAME\fP As above, but send log messages to the listed filename. The "Log" option may appear more than once in a configuration file. Messages are sent to all the logs that match their severity level. .LP .TP \fBOutboundBindAddress \fR\fIIP\fP Make all outbound connections originate from the IP address specified. This is only useful when you have multiple network interfaces, and you want all of Tor's outgoing connections to use a single one. .LP .TP \fBPidFile \fR\fIFILE\fP On startup, write our PID to FILE. On clean shutdown, remove FILE. .LP .TP \fBProtocolWarnings \fR\fB0\fR|\fB1\fR\fP If 1, Tor will log with severity 'warn' various cases of other parties not following the Tor specification. Otherwise, they are logged with severity 'info'. (Default: 0) .LP .TP \fBRunAsDaemon \fR\fB0\fR|\fB1\fR\fP If 1, Tor forks and daemonizes to the background. This option has no effect on Windows; instead you should use the --service command-line option. (Default: 0) .LP .TP \fBSafeLogging \fR\fB0\fR|\fB1\fP If 1, Tor replaces potentially sensitive strings in the logs (e.g. addresses) with the string [scrubbed]. This way logs can still be useful, but they don't leave behind personally identifying information about what sites a user might have visited. (Default: 1) .LP .TP \fBUser \fR\fIUID\fP On startup, setuid to this user. .LP .TP \fBHardwareAccel \fR\fB0\fR|\fB1\fP If non-zero, try to use crypto hardware acceleration when available. This is untested and probably buggy. (Default: 0) .SH CLIENT OPTIONS .PP The following options are useful only for clients (that is, if \fBSocksPort\fP is non-zero): .LP .TP \fBAllowInvalidNodes\fR \fBentry\fR|\fBexit\fR|\fBmiddle\fR|\fBintroduction\fR|\fBrendezvous\fR|...\fP If some Tor servers are obviously not working right, the directory authorities can manually mark them as invalid, meaning that it's not recommended you use them for entry or exit positions in your circuits. You can opt to use them in some circuit positions, though. The default is "middle,rendezvous", and other choices are not advised. .LP .TP \fBCircuitBuildTimeout \fR\fINUM\fP Try for at most NUM seconds when building circuits. If the circuit isn't open in that time, give up on it. (Default: 1 minute.) .LP .TP \fBCircuitIdleTimeout \fR\fINUM\fP If we have keept a clean (never used) circuit around for NUM seconds, then close it. This way when the Tor client is entirely idle, it can expire all of its circuits, and then expire its TLS connections. Also, if we end up making a circuit that is not useful for exiting any of the requests we're receiving, it won't forever take up a slot in the circuit list. (Default: 1 hour.) .LP .TP \fBClientOnly \fR\fB0\fR|\fB1\fR\fP If set to 1, Tor will under no circumstances run as a server. The default is to run as a client unless ORPort is configured. (Usually, you don't need to set this; Tor is pretty smart at figuring out whether you are reliable and high-bandwidth enough to be a useful server.) (Default: 0) .LP .TP \fBExcludeNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of nodes to never use when building a circuit. .LP .TP \fBEntryNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of preferred nodes to use for the first hop in the circuit. These are treated only as preferences unless StrictEntryNodes (see below) is also set. .LP .TP \fBExitNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of preferred nodes to use for the last hop in the circuit. These are treated only as preferences unless StrictExitNodes (see below) is also set. .LP .TP \fBStrictEntryNodes \fR\fB0\fR|\fB1\fR\fP If 1, Tor will never use any nodes besides those listed in "EntryNodes" for the first hop of a circuit. .LP .TP \fBStrictExitNodes \fR\fB0\fR|\fB1\fR\fP If 1, Tor will never use any nodes besides those listed in "ExitNodes" for the last hop of a circuit. .LP .TP \fBFascistFirewall \fR\fB0\fR|\fB1\fR\fP If 1, Tor will only create outgoing connections to ORs running on ports that your firewall allows (defaults to 80 and 443; see \fBFirewallPorts\fR). This will allow you to run Tor as a client behind a firewall with restrictive policies, but will not allow you to run as a server behind such a firewall. This option is deprecated; use ReachableAddresses instead. .LP .TP \fBFirewallPorts \fR\fIPORTS\fP A list of ports that your firewall allows you to connect to. Only used when \fBFascistFirewall\fR is set. This option is deprecated; use ReachableAddresses instead. (Default: 80, 443) .LP .TP \fBReachableAddresses \fR\fIADDR\fP[\fB/\fP\fIMASK\fP][:\fIPORT\fP]...\fP A comma-separated list of IP addresses and ports that your firewall allows you to connect to. The format is as for the addresses in ExitPolicy, except that "accept" is understood unless "reject" is explicitly provided. For example, 'ReachableAddresses 99.0.0.0/8, reject 18.0.0.0/8:80, accept *:80' means that your firewall allows connections to everything inside net 99, rejects port 80 connections to net 18, and accepts connections to port 80 otherwise. (Default: 'accept *:*'.) .LP .TP \fBReachableDirAddresses \fR\fIADDR\fP[\fB/\fP\fIMASK\fP][:\fIPORT\fP]...\fP Like \fBReachableAddresses\fP, a list of addresses and ports. Tor will obey these restrictions when fetching directory information, using standard HTTP GET requests. If not set explicitly then the value of \fBReachableAddresses\fP is used. If \fBHttpProxy\fR is set then these connections will go through that proxy. .LP .TP \fBReachableORAddresses \fR\fIADDR\fP[\fB/\fP\fIMASK\fP][:\fIPORT\fP]...\fP Like \fBReachableAddresses\fP, a list of addresses and ports. Tor will obey these restrictions when connecting to Onion Routers, using TLS/SSL. If not set explicitly then the value of \fBReachableAddresses\fP is used. If \fBHttpsProxy\fR is set then these connections will go through that proxy. The separation between \fBReachableORAddresses\fP and \fBReachableDirAddresses\fP is only interesting when you are connecting through proxies (see \fBHttpProxy\fR and \fBHttpsProxy\fR). Most proxies limit TLS connections (which Tor uses to connect to Onion Routers) to port 443, and some limit HTTP GET requests (which Tor uses for fetching directory information) to port 80. .LP .TP \fBLongLivedPorts \fR\fIPORTS\fP A list of ports for services that tend to have long-running connections (e.g. chat and interactive shells). Circuits for streams that use these ports will contain only high-uptime nodes, to reduce the chance that a node will go down before the stream is finished. (Default: 21, 22, 706, 1863, 5050, 5190, 5222, 5223, 6667, 8300, 8888) .LP .TP \fBMapAddress\fR \fIaddress\fR \fInewaddress\fR When a request for address arrives to Tor, it will rewrite it to newaddress before processing it. For example, if you always want connections to www.indymedia.org to exit via \fItorserver\fR (where \fItorserver\fR is the nickname of the server), use "MapAddress www.indymedia.org www.indymedia.org.torserver.exit". .LP .TP \fBNewCircuitPeriod \fR\fINUM\fP Every NUM seconds consider whether to build a new circuit. (Default: 30 seconds) .LP .TP \fBMaxCircuitDirtiness \fR\fINUM\fP Feel free to reuse a circuit that was first used at most NUM seconds ago, but never attach a new stream to a circuit that is too old. (Default: 10 minutes) .LP .TP \fBNodeFamily \fR\fInickname\fR,\fInickname\fR,\fI...\fP The named Tor servers constitute a "family" of similar or co-administered servers, so never use any two of them in the same circuit. Defining a NodeFamily is only needed when a server doesn't list the family itself (with MyFamily). This option can be used multiple times. .LP .TP .\" \fBPathlenCoinWeight \fR\fI0.0-1.0\fP .\" Paths are 3 hops plus a geometric distribution centered around this coinweight. .\" Must be >=0.0 and <1.0. (Default: 0.3) NOT USED CURRENTLY .\" .TP \fBRendNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of preferred nodes to use for the rendezvous point, if possible. .LP .TP \fBRendExcludeNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of nodes to never use when choosing a rendezvous point. .LP .TP \fBSocksPort \fR\fIPORT\fP Advertise this port to listen for connections from Socks-speaking applications. Set this to 0 if you don't want to allow application connections. (Default: 9050) .LP .TP \fBSocksListenAddress \fR\fIIP\fR[:\fIPORT\fR]\fP Bind to this address to listen for connections from Socks-speaking applications. (Default: 127.0.0.1) You can also specify a port (e.g. 192.168.0.1:9100). This directive can be specified multiple times to bind to multiple addresses/ports. .LP .TP \fBSocksPolicy \fR\fIpolicy\fR,\fIpolicy\fR,\fI...\fP Set an entrance policy for this server, to limit who can connect to the Socks ports. The policies have the same form as exit policies below. .LP .TP \fBSocksTimeout \fR\fINUM\fP Let a socks connection wait NUM seconds unattached before we fail it. (Default: 2 minutes.) .LP .TP \fBTestVia \fR\fInickname\fR,\fInickname\fR,\fI...\fP A list of nodes to prefer for your middle hop when building testing circuits. This option is mainly for debugging reachability problems. .LP .TP \fBTrackHostExits \fR\fIhost\fR,\fI.domain\fR,\fI...\fR\fP For each value in the comma separated list, Tor will track recent connections to hosts that match this value and attempt to reuse the same exit node for each. If the value is prepended with a '.', it is treated as matching an entire domain. If one of the values is just a '.', it means match everything. This option is useful if you frequently connect to sites that will expire all your authentication cookies (ie log you out) if your IP address changes. Note that this option does have the disadvantage of making it more clear that a given history is associated with a single user. However, most people who would wish to observe this will observe it through cookies or other protocol-specific means anyhow. .LP .TP \fBTrackHostExitsExpire \fR\fINUM\fP Since exit servers go up and down, it is desirable to expire the association between host and exit server after NUM seconds. The default is 1800 seconds (30 minutes). .LP .TP \fBUseEntryGuards \fR\fB0\fR|\fB1\fR\fP If this option is set to 1, we pick a few long-term entry servers, and try to stick with them. This is desirable because constantly changing servers increases the odds that an adversary who owns some servers will observe a fraction of your paths. (Defaults to 1.) .LP .TP \fBNumEntryGuards \fR\fINUM\fP If UseEntryGuards is set to 1, we will try to pick a total of NUM routers as long-term entries for our circuits. (Defaults to 3.) .LP .TP \fBSafeSocks \fR\fB0\fR|\fB1\fR\fP When this option is enabled, Tor will reject application connections that use unsafe variants of the socks protocol -- ones that only provide an IP address, meaning the application is doing a DNS resolve first. Specifically, these are socks4 and socks5 when not doing remote DNS. (Defaults to 0.) .LP .TP \fBTestSocks \fR\fB0\fR|\fB1\fR\fP When this option is enabled, Tor will make a notice-level log entry for each connection to the Socks port indicating whether the request used a safe socks protocol or an unsafe one (see above entry on SafeSocks). This helps to determine whether an application using Tor is possibly leaking DNS requests. (Default: 0) .LP .TP \fBVirtualAddrNetwork \fR\fIAddress\fB/\fIbits\fP When a controller asks for a virtual (unused) address with the 'MAPADDRESS' command, Tor picks an unassigned address from this range. (Default: 127.192.0.0/10) .SH SERVER OPTIONS .PP The following options are useful only for servers (that is, if \fBORPort\fP is non-zero): .LP .TP \fBAddress \fR\fIaddress\fP The IP or fqdn of this server (e.g. moria.mit.edu). You can leave this unset, and Tor will guess your IP. .LP .TP \fBAssumeReachable \fR\fB0\fR|\fB1\fR\fP This option is used when bootstrapping a new Tor network. If set to 1, don't do self-reachability testing; just upload your server descriptor immediately. If \fBAuthoritativeDirectory\fP is also set, this option instructs the dirserver to bypass remote reachability testing too and list all connected servers as running. .LP .TP \fBContactInfo \fR\fIemail_address\fP Administrative contact information for server. This line might get picked up by spam harvesters, so you may want to obscure the fact that it's an email address. .LP .TP \fBExitPolicy \fR\fIpolicy\fR,\fIpolicy\fR,\fI...\fP Set an exit policy for this server. Each policy is of the form "\fBaccept\fP|\fBreject\fP \fIADDR\fP[\fB/\fP\fIMASK\fP]\fB[:\fP\fIPORT\fP]". If \fB/\fP\fIMASK\fP is omitted then this policy just applies to the host given. Instead of giving a host or network you can also use "\fB*\fP" to denote the universe (0.0.0.0/0). \fIPORT\fP can be a single port number, an interval of ports "\fIFROM_PORT\fP\fB-\fP\fITO_PORT\fP", or "\fB*\fP". If \fIPORT\fP is omitted, that means "\fB*\fP". For example, "accept 18.7.22.69:*,reject 18.0.0.0/8:*,accept *:*" would reject any traffic destined for MIT except for web.mit.edu, and accept anything else. To specify all internal and link-local networks (including 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, and 172.16.0.0/12), you can use the "private" alias instead of an address. These addresses are rejected by default (at the beginning of your exit policy) unless you set the ExitPolicyRejectPrivate config option to 0. For example, once you've done that, you could allow HTTP to 127.0.0.1 and block all other connections to internal networks with "accept 127.0.0.1:80,reject private:*". See RFC 1918 and RFC 3330 for more details about internal and reserved IP address space. This directive can be specified multiple times so you don't have to put it all on one line. Policies are considered first to last, and the first match wins. If you want to _replace_ the default exit policy, end your exit policy with either a reject *:* or an accept *:*. Otherwise, you're _augmenting_ (prepending to) the default exit policy. The default exit policy is: .PD 0 .RS 12 .IP "reject *:25" .IP "reject *:119" .IP "reject *:135-139" .IP "reject *:445" .IP "reject *:465" .IP "reject *:587" .IP "reject *:1214" .IP "reject *:4661-4666" .IP "reject *:6346-6429" .IP "reject *:6699" .IP "reject *:6881-6999" .IP "accept *:*" .RE .PD .LP .TP \fBExitPolicyRejectPrivate \fR\fB0\fR|\fB1\fR\fP Reject all private (local) networks at the beginning of your exit policy. See above entry on ExitPolicy. (Default: 1) .LP .TP \fBMaxOnionsPending \fR\fINUM\fP If you have more than this number of onionskins queued for decrypt, reject new ones. (Default: 100) .LP .TP \fBMyFamily \fR\fInickname\fR,\fInickname\fR,\fI...\fP Declare that this Tor server is controlled or administered by a group or organization identical or similar to that of the other named servers. When two servers both declare that they are in the same 'family', Tor clients will not use them in the same circuit. (Each server only needs to list the other servers in its family; it doesn't need to list itself, but it won't hurt.) .LP .TP \fBNickname \fR\fIname\fP Set the server's nickname to 'name'. Nicknames must be between 1 and 19 characters inclusive, and must contain only the characters [a-zA-Z0-9]. .LP .TP \fBNumCPUs \fR\fInum\fP How many processes to use at once for decrypting onionskins. (Default: 1) .LP .TP \fBORPort \fR\fIPORT\fP Advertise this port to listen for connections from Tor clients and servers. .LP .TP \fBORListenAddress \fR\fIIP\fR[:\fIPORT\fR]\fP Bind to this IP address to listen for connections from Tor clients and servers. If you specify a port, bind to this port rather than the one specified in ORPort. (Default: 0.0.0.0) .LP .TP \fBPublishServerDescriptor \fR\fB0\fR|\fB1\fR\fP If set to 0, Tor will act as a server if you have an ORPort defined, but it will not publish its descriptor to the dirservers. This option is useful if you're testing out your server, or if you're using a Tor controller that handles directory publishing for you. (Default: 1) .LP .TP \fBRedirectExit \fR\fIpattern target\fP Whenever an outgoing connection tries to connect to one of a given set of addresses, connect to \fItarget\fP (an \fIaddress:port\fP pair) instead. The address pattern is given in the same format as for an exit policy. The address translation applies after exit policies are applied. Multiple \fBRedirectExit\fP options can be used: once any one has matched successfully, no subsequent rules are considered. You can specify that no redirection is to be performed on a given set of addresses by using the special target string "pass", which prevents subsequent rules from being considered. .LP .TP \fBShutdownWaitLength\fR \fINUM\fP When we get a SIGINT and we're a server, we begin shutting down: we close listeners and start refusing new circuits. After \fBNUM\fP seconds, we exit. If we get a second SIGINT, we exit immediately. (Default: 30 seconds) .LP .TP \fBAccountingMax \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP Never send more than the specified number of bytes in a given accounting period, or receive more than that number in the period. For example, with AccountingMax set to 1 GB, a server could send 900 MB and receive 800 MB and continue running. It will only hibernate once one of the two reaches 1 GB. When the number of bytes is exhausted, Tor will hibernate until some time in the next accounting period. To prevent all servers from waking at the same time, Tor will also wait until a random point in each period before waking up. If you have bandwidth cost issues, enabling hibernation is preferable to setting a low bandwidth, since it provides users with a collection of fast servers that are up some of the time, which is more useful than a set of slow servers that are always "available". .LP .TP \fBAccountingStart \fR\fBday\fR|\fBweek\fR|\fBmonth\fR [\fIday\fR] \fIHH:MM\fR\fP Specify how long accounting periods last. If \fBmonth\fP is given, each accounting period runs from the time \fIHH:MM\fR on the \fIday\fRth day of one month to the same day and time of the next. (The day must be between 1 and 28.) If \fBweek\fP is given, each accounting period runs from the time \fIHH:MM\fR of the \fIday\fRth day of one week to the same day and time of the next week, with Monday as day 1 and Sunday as day 7. If \fBday\fR is given, each accounting period runs from the time \fIHH:MM\fR each day to the same time on the next day. All times are local, and given in 24-hour time. (Defaults to "month 1 0:00".) .SH DIRECTORY SERVER OPTIONS .PP The following options are useful only for directory servers (that is, if \fBDirPort\fP is non-zero): .LP .TP \fBAuthoritativeDirectory \fR\fB0\fR|\fB1\fR\fP When this option is set to 1, Tor operates as an authoritative directory server. Instead of caching the directory, it generates its own list of good servers, signs it, and sends that to the clients. Unless the clients already have you listed as a trusted directory, you probably do not want to set this option. Please coordinate with the other admins at tor-ops@freehaven.net if you think you should be a directory. .LP .TP \fBV1AuthoritativeDirectory \fR\fB0\fR|\fB1\fR\fP When this option is set in addition to \fBAuthoritativeDirectory\fP, Tor also generates a version 1 directory (for Tor clients up to 0.1.0.x). (As of Tor 0.1.1.12 every (v2) authoritative directory still provides most of the v1 directory functionality, even without this option set to 1. This however is expected to change in the future.) .LP .TP \fBVersioningAuthoritativeDirectory \fR\fB0\fR|\fB1\fR\fP When this option is set to 1, Tor adds information on which versions of Tor are still believed safe for use to the published directory. Each version 1 authority is automatically a versioning authority; version 2 authorities provide this service optionally. See \fBRecommendedVersions\fP, \fBRecommendedClientVersions\fP, and \fBRecommendedServerVersions\fP. .LP .TP \fBNamingAuthoritativeDirectory \fR\fB0\fR|\fB1\fR\fP When this option is set to 1, then the server advertises that it has opinions about nickname-to-fingerprint bindings. It will include these opinions in its published network-status pages, by listing servers with the flag "Named" if a correct binding between that nickname and fingerprint has been registered with the dirserver. Naming dirservers will refuse to accept or publish descriptors that contradict a registered binding. See \fBapproved-routers\fP in the \fBFILES\fP section below. .LP .TP \fBDirPort \fR\fIPORT\fP Advertise the directory service on this port. .LP .TP \fBDirListenAddress \fR\fIIP\fR[:\fIPORT\fR]\fP Bind the directory service to this address. If you specify a port, bind to this port rather than the one specified in DirPort. (Default: 0.0.0.0) .LP .TP \fBDirPolicy \fR\fIpolicy\fR,\fIpolicy\fR,\fI...\fP Set an entrance policy for this server, to limit who can connect to the directory ports. The policies have the same form as exit policies above. .LP .TP \fBRecommendedVersions \fR\fISTRING\fP STRING is a comma-separated list of Tor versions currently believed to be safe. The list is included in each directory, and nodes which pull down the directory learn whether they need to upgrade. This option can appear multiple times: the values from multiple lines are spliced together. When this is set then \fBVersioningAuthoritativeDirectory\fP should be set too. .LP .TP \fBRecommendedClientVersions \fR\fISTRING\fP STRING is a comma-separated list of Tor versions currently believed to be safe for clients to use. This information is included in version 2 directories. If this is not set then the value of \fBRecommendedVersions\fR is used. When this is set then \fBVersioningAuthoritativeDirectory\fP should be set too. .LP .TP \fBRecommendedServerVersions \fR\fISTRING\fP STRING is a comma-separated list of Tor versions currently believed to be safe for servers to use. This information is included in version 2 directories. If this is not set then the value of \fBRecommendedVersions\fR is used. When this is set then \fBVersioningAuthoritativeDirectory\fP should be set too. .LP .TP \fBDirAllowPrivateAddresses \fR\fB0\fR|\fB1\fR\fP If set to 1, Tor will accept router descriptors with arbitrary "Address" elements. Otherwise, if the address is not an IP or is a private IP, it will reject the router descriptor. Defaults to 0. .LP .TP \fBRunTesting \fR\fB0\fR|\fB1\fR\fP If set to 1, Tor tries to build circuits through all of the servers it knows about, so it can tell which are up and which are down. This option is only useful for authoritative directories, so you probably don't want to use it. .LP .TP \fBAuthDirInvalid \fR\fIAddressPattern\fR...\fP Authoritative directories only. A set of address patterns for servers that will never be listed as "valid" in any network status document that this authority publishes. .LP .TP \fBAuthDirReject \fR\fIAddressPattern\fR...\fP Authoritative directories only. A set of address patterns for servers that will never be listed at all in any network status document that this authority publishes, or accepted as an OR address in any descriptor submitted for publication by this authority. .LP .TP \fBAuthDirRejectUnlisted \fR\fB0\fR|\fB1\fR\fP Authoritative directories only. If set to 1, the directory server rejects all uploaded server descriptors that aren't explicitly listed in the fingerprints file. This acts as a "panic button" if we get Sybiled. (Default: 0) .SH HIDDEN SERVICE OPTIONS .PP The following options are used to configure a hidden service. .LP .TP \fBHiddenServiceDir \fR\fIDIRECTORY\fP Store data files for a hidden service in DIRECTORY. Every hidden service must have a separate directory. You may use this option multiple times to specify multiple services. .LP .TP \fBHiddenServicePort \fR\fIVIRTPORT \fR[\fITARGET\fR]\fP Configure a virtual port VIRTPORT for a hidden service. You may use this option multiple times; each time applies to the service using the most recent hiddenservicedir. By default, this option maps the virtual port to the same port on 127.0.0.1. You may override the target port, address, or both by specifying a target of addr, port, or addr:port. .LP .TP \fBHiddenServiceNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP If possible, use the specified nodes as introduction points for the hidden service. If this is left unset, Tor will be smart and pick some reasonable ones; most people can leave this unset. .LP .TP \fBHiddenServiceExcludeNodes \fR\fInickname\fR,\fInickname\fR,\fI...\fP Do not use the specified nodes as introduction points for the hidden service. In normal use there is no reason to set this. .LP .TP \fBPublishHidServDescriptors \fR\fB0\fR|\fB1\fR\fP If set to 0, Tor will run any hidden services you configure, but it won't advertise them to the rendezvous directory. This option is only useful if you're using a Tor controller that handles hidserv publishing for you. (Default: 1) .LP .TP \fBRendPostPeriod \fR\fIN\fR \fBseconds\fR|\fBminutes\fR|\fBhours\fR|\fBdays\fR|\fBweeks\fP Every time the specified period elapses, Tor uploads any rendezvous service descriptors to the directory servers. This information is also uploaded whenever it changes. (Default: 20 minutes) .\" UNDOCUMENTED .\" ignoreversion .SH SIGNALS Tor catches the following signals: .LP .TP \fBSIGTERM\fR Tor will catch this, clean up and sync to disk if necessary, and exit. .LP .TP \fBSIGINT\fR Tor clients behave as with SIGTERM; but Tor servers will do a controlled slow shutdown, closing listeners and waiting 30 seconds before exiting. (The delay can be configured with the ShutdownWaitLength config option.) .LP .TP \fBSIGHUP\fR The signal instructs Tor to reload its configuration (including closing and reopening logs), fetch a new directory, and kill and restart its helper processes if applicable. .LP .TP \fBSIGUSR1\fR Log statistics about current connections, past connections, and throughput. .LP .TP \fBSIGUSR2\fR Switch all logs to loglevel debug. You can go back to the old loglevels by sending a SIGHUP. .LP .TP \fBSIGCHLD\fR Tor receives this signal when one of its helper processes has exited, so it can clean up. .LP .TP \fBSIGPIPE\fR Tor catches this signal and ignores it. .LP .TP \fBSIGXFSZ\fR If this signal exists on your platform, Tor catches and ignores it. .SH FILES .LP .TP .B @CONFDIR@/torrc The configuration file, which contains "option value" pairs. .LP .TP .B @LOCALSTATEDIR@/lib/tor/ The tor process stores keys and other data here. .LP .TP .B \fIDataDirectory\fP/approved-routers Only for naming authoritative directory servers (see \fBNamingAuthoritativeDirectory\fP). This file lists nickname to identity bindings. Each line lists a nickname and a fingerprint seperated by whitespace. See your \fBfingerprint\fP file in the \fIDataDirectory\fP for an example line. If the nickname is \fB!reject\fP then descriptors from the given identity (fingerprint) are rejected by the authoritative directory server. If it is \fB!invalid\fP then descriptors are accepted but marked in the directory as not valid, that is, not recommended. .SH SEE ALSO .BR privoxy (1), .BR tsocks (1), .BR torify (1) .BR http://tor.eff.org/ .SH BUGS Plenty, probably. Tor is still in development. Please report them. .SH AUTHORS Roger Dingledine , Nick Mathewson .