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Add UnixSocketsGroupWritable config flag

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When running a system-wide instance of Tor on Unix-like systems, having
a ControlSocket is a quite handy mechanism to access Tor control
channel.  But it would be easier if access to the Unix domain socket can
be granted by making control users members of the group running the Tor
process.

This change introduces a UnixSocketsGroupWritable option, which will
create Unix domain sockets (and thus ControlSocket) 'g+rw'. This allows
ControlSocket to offer same access control measures than
ControlPort+CookieAuthFileGroupReadable.

See <http://bugs.debian.org/552556> for more details.
This commit is contained in:
Jérémy Bobbio 2011-04-23 02:35:02 +02:00 committed by Nick Mathewson
parent 2b9c5ee301
commit d41ac64ad6
4 changed files with 15 additions and 1 deletions
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5
doc/tor.1.txt
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@ -167,6 +167,11 @@ Other options can be specified either on the command-line (--option
Like ControlPort, but listens on a Unix domain socket, rather than a TCP
socket. (Unix and Unix-like systems only.)
**UnixSocketsGroupWritable** **0**|**1**::
If this option is set to 0, don't allow the filesystem group to read and
write unix sockets (e.g. ControlSocket). If the option is set to 1, make
the control socket readable and writable by the default GID. (Default: 0)
**HashedControlPassword** __hashed_password__::
Don't allow any connections on the control port except when the other
process knows the password whose one-way hash is __hashed_password__. You

3
src/or/config.c
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@ -209,6 +209,7 @@ static config_var_t _option_vars[] = {
V(ControlPortFileGroupReadable,BOOL, "0"),
V(ControlPortWriteToFile, FILENAME, NULL),
V(ControlSocket, LINELIST, NULL),
V(UnixSocketsGroupWritable, BOOL, "0"),
V(CookieAuthentication, BOOL, "0"),
V(CookieAuthFileGroupReadable, BOOL, "0"),
V(CookieAuthFile, STRING, NULL),
@ -952,7 +953,7 @@ options_act_reversible(or_options_t *old_options, char **msg)
}
#ifndef HAVE_SYS_UN_H
if (options->ControlSocket) {
if (options->ControlSocket || options->UnixSocketsGroupWritable) {
*msg = tor_strdup("Unix domain sockets (ControlSocket) not supported"
" on this OS/with this build.");
goto rollback;

7
src/or/connection.c
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@ -966,6 +966,13 @@ connection_create_listener(const struct sockaddr *listensockaddr,
tor_socket_strerror(tor_socket_errno(s)));
goto err;
}
if (get_options()->UnixSocketsGroupWritable) {
if (chmod(address, 0660) < 0) {
log_warn(LD_FS,"Unable to make %s group-readable.", address);
tor_close_socket(s);
goto err;
}
}
if (listen(s,SOMAXCONN) < 0) {
log_warn(LD_NET, "Could not listen on %s: %s", address,

1
src/or/or.h
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@ -2445,6 +2445,7 @@ typedef struct {
int ControlPort; /**< Port to listen on for control connections. */
config_line_t *ControlSocket; /**< List of Unix Domain Sockets to listen on
* for control connections. */
int UnixSocketsGroupWritable; /**< Boolean: Are unix sockets g+rw? */
int DirPort; /**< Port to listen on for directory connections. */
int DNSPort; /**< Port to listen on for DNS requests. */
int AssumeReachable; /**< Whether to publish our descriptor regardless. */