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Allow {World,Group}Writable on AF_UNIX {Socks,Control}Ports.

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Closes ticket 15220
This commit is contained in:
Nick Mathewson 2015-03-11 13:26:14 -04:00
parent 985687bc4f
commit 809517a863
5 changed files with 88 additions and 37 deletions
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5
changes/feature15220 Normal file
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@ -0,0 +1,5 @@
o Minor features (client, unix sockets):
- Add GroupWritable and WorldWritable options to unix-socket based
SocksPort and ControlPort options. These options apply to a single
socket, and override {Control,Socks}SocketsGroupWritable. Closes
ticket 15220.

16
doc/tor.1.txt
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@ -274,7 +274,7 @@ GENERAL OPTIONS
all sockets will be set to this limit. Must be a value between 2048 and
262144, in 1024 byte increments. Default of 8192 is recommended.
[[ControlPort]] **ControlPort** __PORT__|**unix:**__path__|**auto**::
[[ControlPort]] **ControlPort** __PORT__|**unix:**__path__|**auto** [__flags__]::
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 or
@ -284,6 +284,14 @@ GENERAL OPTIONS
method is sufficient to authenticate to Tor.) This
option is required for many Tor controllers; most use the value of 9051.
Set it to "auto" to have Tor pick a port for you. (Default: 0)
+
Recognized flags are::
**GroupWritable**;;
Unix domain sockets only: makes the socket get created as
group-writable.
**WorldWritable**;;
Unix domain sockets only: makes the socket get created as
world-writable.
[[ControlListenAddress]] **ControlListenAddress** __IP__[:__PORT__]::
Bind the controller listener to this address. If you specify a port, bind
@ -1015,6 +1023,12 @@ The following options are useful only for clients (that is, if
**CacheIPv6DNS**;;
Tells the client to remember IPv6 DNS answers we receive from exit
nodes via this connection.
**GroupWritable**;;
Unix domain sockets only: makes the socket get created as
group-writable.
**WorldWritable**;;
Unix domain sockets only: makes the socket get created as
world-writable.
**CacheDNS**;;
Tells the client to remember all DNS answers we receive from exit
nodes via this connection.

55
src/or/config.c
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@ -5618,7 +5618,7 @@ warn_nonlocal_ext_orports(const smartlist_t *ports, const char *portname)
* then emit a stronger warning and remove the port from the list.
*/
static void
warn_nonlocal_controller_ports(smartlist_t *ports, unsigned forbid)
warn_nonlocal_controller_ports(smartlist_t *ports, unsigned forbid_nonlocal)
{
int warned = 0;
SMARTLIST_FOREACH_BEGIN(ports, port_cfg_t *, port) {
@ -5627,7 +5627,7 @@ warn_nonlocal_controller_ports(smartlist_t *ports, unsigned forbid)
if (port->is_unix_addr)
continue;
if (!tor_addr_is_loopback(&port->addr)) {
if (forbid) {
if (forbid_nonlocal) {
if (!warned)
log_warn(LD_CONFIG,
"You have a ControlPort set to accept "
@ -5655,13 +5655,14 @@ warn_nonlocal_controller_ports(smartlist_t *ports, unsigned forbid)
} SMARTLIST_FOREACH_END(port);
}
#define CL_PORT_NO_OPTIONS (1u<<0)
#define CL_PORT_NO_STREAM_OPTIONS (1u<<0)
#define CL_PORT_WARN_NONLOCAL (1u<<1)
#define CL_PORT_ALLOW_EXTRA_LISTENADDR (1u<<2)
#define CL_PORT_SERVER_OPTIONS (1u<<3)
#define CL_PORT_FORBID_NONLOCAL (1u<<4)
#define CL_PORT_TAKES_HOSTNAMES (1u<<5)
#define CL_PORT_IS_UNIXSOCKET (1u<<6)
#define CL_PORT_DFLT_GROUP_WRITABLE (1u<<7)
#ifdef HAVE_SYS_UN_H
@ -5729,7 +5730,7 @@ config_parse_unix_port(const char *addrport, char **path_out)
* If no address is specified, default to <b>defaultaddr</b>. If no
* FooPort is given, default to defaultport (if 0, there is no default).
*
* If CL_PORT_NO_OPTIONS is set in <b>flags</b>, do not allow stream
* If CL_PORT_NO_STREAM_OPTIONS is set in <b>flags</b>, do not allow stream
* isolation options in the FooPort entries.
*
* If CL_PORT_WARN_NONLOCAL is set in <b>flags</b>, warn if any of the
@ -5764,10 +5765,12 @@ parse_port_config(smartlist_t *out,
int retval = -1;
const unsigned is_control = (listener_type == CONN_TYPE_CONTROL_LISTENER);
const unsigned is_ext_orport = (listener_type == CONN_TYPE_EXT_OR_LISTENER);
const unsigned allow_no_options = flags & CL_PORT_NO_OPTIONS;
const unsigned allow_no_stream_options = flags & CL_PORT_NO_STREAM_OPTIONS;
const unsigned use_server_options = flags & CL_PORT_SERVER_OPTIONS;
const unsigned warn_nonlocal = flags & CL_PORT_WARN_NONLOCAL;
const unsigned forbid_nonlocal = flags & CL_PORT_FORBID_NONLOCAL;
const unsigned default_to_group_writable =
flags & CL_PORT_DFLT_GROUP_WRITABLE;
const unsigned allow_spurious_listenaddr =
flags & CL_PORT_ALLOW_EXTRA_LISTENADDR;
const unsigned takes_hostnames = flags & CL_PORT_TAKES_HOSTNAMES;
@ -5891,7 +5894,7 @@ parse_port_config(smartlist_t *out,
ipv4_traffic = 1, ipv6_traffic = 0, prefer_ipv6 = 0,
cache_ipv4 = 1, use_cached_ipv4 = 0,
cache_ipv6 = 0, use_cached_ipv6 = 0,
prefer_ipv6_automap = 1;
prefer_ipv6_automap = 1, world_writable = 0, group_writable = 0;
smartlist_split_string(elts, ports->value, NULL,
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
@ -5900,11 +5903,6 @@ parse_port_config(smartlist_t *out,
goto err;
}
if (allow_no_options && smartlist_len(elts) > 1) {
log_warn(LD_CONFIG, "Too many options on %sPort line", portname);
goto err;
}
/* Now parse the addr/port value */
addrport = smartlist_get(elts, 0);
@ -5962,6 +5960,9 @@ parse_port_config(smartlist_t *out,
}
}
if (unix_socket_path && default_to_group_writable)
group_writable = 1;
/* Now parse the rest of the options, if any. */
if (use_server_options) {
/* This is a server port; parse advertising options */
@ -6018,10 +6019,11 @@ parse_port_config(smartlist_t *out,
const char *elt_orig = elt;
if (elt_sl_idx == 0)
continue; /* Skip addr:port */
if (!strcasecmpstart(elt, "SessionGroup=")) {
int group = (int)tor_parse_long(elt+strlen("SessionGroup="),
10, 0, INT_MAX, &ok, NULL);
if (!ok) {
if (!ok || !allow_no_stream_options) {
log_warn(LD_CONFIG, "Invalid %sPort option '%s'",
portname, escaped(elt));
goto err;
@ -6040,6 +6042,18 @@ parse_port_config(smartlist_t *out,
elt += 2;
}
if (!strcasecmp(elt, "GroupWritable")) {
group_writable = !no;
} else if (!strcasecmp(elt, "WorldWritable")) {
world_writable = !no;
}
if (allow_no_stream_options) {
log_warn(LD_CONFIG, "Unrecognized %sPort option '%s'",
portname, escaped(elt));
continue;
}
if (takes_hostnames) {
if (!strcasecmp(elt, "IPv4Traffic")) {
ipv4_traffic = ! no;
@ -6115,6 +6129,12 @@ parse_port_config(smartlist_t *out,
goto err;
}
if ( (world_writable || group_writable) && ! unix_socket_path) {
log_warn(LD_CONFIG, "You have a %sPort entry with GroupWritable "
"or WorldWritable set, but it is not a unix socket.", portname);
goto err;
}
if (out && port) {
size_t namelen = unix_socket_path ? strlen(unix_socket_path) : 0;
port_cfg_t *cfg = port_cfg_new(namelen);
@ -6128,6 +6148,8 @@ parse_port_config(smartlist_t *out,
cfg->port = port;
}
cfg->type = listener_type;
cfg->is_world_writable = world_writable;
cfg->is_group_writable = group_writable;
cfg->entry_cfg.isolation_flags = isolation;
cfg->entry_cfg.session_group = sessiongroup;
cfg->server_cfg.no_advertise = no_advertise;
@ -6214,12 +6236,14 @@ parse_ports(or_options_t *options, int validate_only,
*n_ports_out = 0;
const unsigned gw_flag = options->SocksSocketsGroupWritable ?
CL_PORT_DFLT_GROUP_WRITABLE : 0;
if (parse_port_config(ports,
options->SocksPort_lines, options->SocksListenAddress,
"Socks", CONN_TYPE_AP_LISTENER,
"127.0.0.1", 9050,
CL_PORT_WARN_NONLOCAL|CL_PORT_ALLOW_EXTRA_LISTENADDR|
CL_PORT_TAKES_HOSTNAMES) < 0) {
CL_PORT_TAKES_HOSTNAMES|gw_flag) < 0) {
*msg = tor_strdup("Invalid SocksPort/SocksListenAddress configuration");
goto err;
}
@ -6248,12 +6272,15 @@ parse_ports(or_options_t *options, int validate_only,
goto err;
}
{
unsigned control_port_flags = CL_PORT_NO_OPTIONS | CL_PORT_WARN_NONLOCAL;
unsigned control_port_flags = CL_PORT_NO_STREAM_OPTIONS |
CL_PORT_WARN_NONLOCAL;
const int any_passwords = (options->HashedControlPassword ||
options->HashedControlSessionPassword ||
options->CookieAuthentication);
if (! any_passwords)
control_port_flags |= CL_PORT_FORBID_NONLOCAL;
if (options->ControlSocketsGroupWritable)
control_port_flags |= CL_PORT_DFLT_GROUP_WRITABLE;
if (parse_port_config(ports,
options->ControlPort_lines,

46
src/or/connection.c
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@ -972,7 +972,7 @@ unix_socket_purpose_to_string(int purpose)
* <b>path</b>. Return 0 if we should go ahead and -1 if we shouldn't. */
static int
check_location_for_unix_socket(const or_options_t *options, const char *path,
int purpose)
int purpose, const port_cfg_t *port)
{
int r = -1;
char *p = NULL;
@ -987,10 +987,13 @@ check_location_for_unix_socket(const or_options_t *options, const char *path,
goto done;
}
if ((purpose == UNIX_SOCKET_PURPOSE_CONTROL_SOCKET &&
options->ControlSocketsGroupWritable) ||
(purpose == UNIX_SOCKET_PURPOSE_SOCKS_SOCKET &&
options->SocksSocketsGroupWritable)) {
if (port->is_world_writable) {
/* World-writable sockets can go anywhere. */
r = 0;
goto done;
}
if (port->is_group_writable) {
flags |= CPD_GROUP_OK;
}
@ -1004,7 +1007,7 @@ check_location_for_unix_socket(const or_options_t *options, const char *path,
"who can list a socket can connect to it, so Tor is being "
"careful.)",
unix_socket_purpose_to_string(purpose), escpath, escdir,
options->ControlSocketsGroupWritable ? " and group" : "");
port->is_group_writable ? " and group" : "");
tor_free(escpath);
tor_free(escdir);
goto done;
@ -1198,7 +1201,7 @@ connection_listener_new(const struct sockaddr *listensockaddr,
if (check_location_for_unix_socket(options, address,
(type == CONN_TYPE_CONTROL_LISTENER) ?
UNIX_SOCKET_PURPOSE_CONTROL_SOCKET :
UNIX_SOCKET_PURPOSE_SOCKS_SOCKET) < 0) {
UNIX_SOCKET_PURPOSE_SOCKS_SOCKET, port_cfg) < 0) {
goto err;
}
@ -1241,24 +1244,23 @@ connection_listener_new(const struct sockaddr *listensockaddr,
}
#endif
if ((type == CONN_TYPE_CONTROL_LISTENER &&
options->ControlSocketsGroupWritable) ||
(type == CONN_TYPE_AP_LISTENER &&
options->SocksSocketsGroupWritable)) {
/* We need to use chmod; fchmod doesn't work on sockets on all
* platforms. */
if (chmod(address, 0660) < 0) {
log_warn(LD_FS,"Unable to make %s group-writable.", address);
goto err;
{
unsigned mode;
const char *status;
if (port_cfg->is_world_writable) {
mode = 0666;
status = "world-writable";
} else if (port_cfg->is_group_writable) {
mode = 0660;
status = "group-writable";
} else {
mode = 0600;
status = "private";
}
} else if ((type == CONN_TYPE_CONTROL_LISTENER &&
!(options->ControlSocketsGroupWritable)) ||
(type == CONN_TYPE_AP_LISTENER &&
!(options->SocksSocketsGroupWritable))) {
/* We need to use chmod; fchmod doesn't work on sockets on all
* platforms. */
if (chmod(address, 0600) < 0) {
log_warn(LD_FS,"Unable to make %s group-writable.", address);
if (chmod(address, mode) < 0) {
log_warn(LD_FS,"Unable to make %s %s.", address, status);
goto err;
}
}

3
src/or/or.h
View File

@ -3322,6 +3322,9 @@ typedef struct port_cfg_t {
uint8_t type; /**< One of CONN_TYPE_*_LISTENER */
unsigned is_unix_addr : 1; /**< True iff this is an AF_UNIX address. */
unsigned is_group_writable : 1;
unsigned is_world_writable : 1;
entry_port_cfg_t entry_cfg;
server_port_cfg_t server_cfg;