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Disallow disabling DisableDebuggerAttachment on runnning Tor

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Also, have tor_disable_debugger_attach() return a tristate of
success/failure/don't-know-how , and only log appropriately.
This commit is contained in:
Sebastian Hahn 2011-12-08 09:19:09 +01:00 committed by Nick Mathewson
parent 65420e4cb5
commit 98959f63ac
3 changed files with 34 additions and 12 deletions
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4
doc/tor.1.txt
View File

@ -282,8 +282,8 @@ Other options can be specified either on the command-line (--option
to alter the system wide ptrace scope as it may not even exist. If you wish
to attach to Tor with a debugger such as gdb or strace you will want to set
this to 0 for the duration of your debugging. Normal users should leave it
on. (Default: 1)
on. Disabling this option while Tor is running is prohibited. (Default: 1)
**FetchDirInfoEarly** **0**|**1**::
If set to 1, Tor will always fetch directory information like other
directory caches, even if you don't meet the normal criteria for fetching

9
src/common/compat.c
View File

@ -1542,8 +1542,8 @@ switch_id(const char *user)
* CAP_SYS_PTRACE and so it is very likely that root will still be able to
* attach to the Tor process.
*/
/** Attempt to disable debugger attachment: return 0 on success, -1 on
* failure. */
/** Attempt to disable debugger attachment: return 1 on success, -1 on
* failure, and 0 if we don't know how to try on this platform. */
int
tor_disable_debugger_attach(void)
{
@ -1568,11 +1568,12 @@ tor_disable_debugger_attach(void)
// XXX: TODO - Mac OS X has dtrace and this may be disabled.
// XXX: TODO - Windows probably has something similar
if (r == 0) {
if (r == 0 && attempted) {
log_debug(LD_CONFIG,"Debugger attachment disabled for "
"unprivileged users.");
return 1;
} else if (attempted) {
log_warn(LD_CONFIG, "Unable to disable ptrace attach: %s",
log_warn(LD_CONFIG, "Unable to disable debugger attaching: %s",
strerror(errno));
}
return r;

33
src/or/config.c
View File

@ -1326,12 +1326,26 @@ options_act(const or_options_t *old_options)
const int transition_affects_workers =
old_options && options_transition_affects_workers(old_options, options);
/* disable ptrace and later, other basic debugging techniques */
if (options->DisableDebuggerAttachment) {
tor_disable_debugger_attach();
} else {
log_notice(LD_CONFIG,"Debugger attachment enabled "
"for unprivileged users.");
/* disable ptrace and later, other basic debugging techniques */
{
/* Remember if we already disabled debugger attachment */
static int disabled_debugger_attach = 0;
/* Remember if we already warned about being configured not to disable
* debugger attachment */
static int warned_debugger_attach = 0;
if (options->DisableDebuggerAttachment && !disabled_debugger_attach) {
int ok = tor_disable_debugger_attach();
if (warned_debugger_attach && ok == 1) {
log_notice(LD_CONFIG, "Disabled attaching debuggers for unprivileged "
"users.");
}
disabled_debugger_attach = (ok == 1);
} else if (!options->DisableDebuggerAttachment &&
!warned_debugger_attach) {
log_notice(LD_CONFIG, "Not disabling debugger attaching for "
"unprivileged users.");
warned_debugger_attach = 1;
}
}
if (running_tor && !have_lockfile()) {
@ -4170,6 +4184,13 @@ options_transition_allowed(const or_options_t *old,
return -1;
}
if (old->DisableDebuggerAttachment &&
!new_val->DisableDebuggerAttachment) {
*msg = tor_strdup("While Tor is running, disabling "
"DisableDebuggerAttachment is not allowed.");
return -1;
}
return 0;
}