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Do group setup in policy_init_session() before calling out to the

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plugin.  This makes it possible for the pam_group module to change
the group in pam_setcred().  It's a bit bogus since pam_setcred()
is documented as not changing the group or user ID, but pam_group
is shipped with stock Linux-PAM so we need to support it.
This commit is contained in:
Todd C. Miller
2016-04-28 11:01:58 -06:00
parent 57b1dc5e1d
commit f88da1c1a0
1 changed files with 32 additions and 25 deletions
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57
src/sudo.c
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@@ -939,7 +939,8 @@ restore_nproc(void)
}
/*
* Setup the execution environment immediately prior to the call to execve()
* Setup the execution environment immediately prior to the call to execve().
* Group setup is performed by policy_init_session(), called earlier.
* Returns true on success and false on failure.
*/
bool
@@ -1018,30 +1019,6 @@ exec_setup(struct command_details *details, const char *ptyname, int ptyfd)
#endif /* HAVE_LOGIN_CAP_H */
}
/*
* Set groups, including supplementary group vector.
*/
if (!ISSET(details->flags, CD_PRESERVE_GROUPS)) {
if (details->ngroups >= 0) {
if (sudo_setgroups(details->ngroups, details->groups) < 0) {
sudo_warn(U_("unable to set supplementary group IDs"));
goto done;
}
}
}
#ifdef HAVE_SETEUID
if (ISSET(details->flags, CD_SET_EGID) && setegid(details->egid)) {
sudo_warn(U_("unable to set effective gid to runas gid %u"),
(unsigned int)details->egid);
goto done;
}
#endif
if (ISSET(details->flags, CD_SET_GID) && setgid(details->gid)) {
sudo_warn(U_("unable to set gid to runas gid %u"),
(unsigned int)details->gid);
goto done;
}
if (ISSET(details->flags, CD_SET_PRIORITY)) {
if (setpriority(PRIO_PROCESS, 0, details->priority) != 0) {
sudo_warn(U_("unable to set process priority"));
@@ -1365,6 +1342,35 @@ policy_init_session(struct command_details *details)
int rval = true;
debug_decl(policy_init_session, SUDO_DEBUG_PCOMM)
/*
* We set groups, including supplementary group vector,
* as part of the session setup. This allows for dynamic
* groups to be set via pam_group(8) in pam_setcred(3).
*/
if (!ISSET(details->flags, CD_PRESERVE_GROUPS)) {
if (details->ngroups >= 0) {
if (sudo_setgroups(details->ngroups, details->groups) < 0) {
sudo_warn(U_("unable to set supplementary group IDs"));
rval = -1;
goto done;
}
}
}
#ifdef HAVE_SETEUID
if (ISSET(details->flags, CD_SET_EGID) && setegid(details->egid)) {
sudo_warn(U_("unable to set effective gid to runas gid %u"),
(unsigned int)details->egid);
rval = -1;
goto done;
}
#endif
if (ISSET(details->flags, CD_SET_GID) && setgid(details->gid)) {
sudo_warn(U_("unable to set gid to runas gid %u"),
(unsigned int)details->gid);
rval = -1;
goto done;
}
if (policy_plugin.u.policy->init_session) {
/*
* Backwards compatibility for older API versions
@@ -1381,6 +1387,7 @@ policy_init_session(struct command_details *details)
}
sudo_debug_set_active_instance(sudo_debug_instance);
}
done:
debug_return_int(rval);
}