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/* wydawca - automatic release submission daemon
Copyright (C) 2007, 2009-2011 Sergey Poznyakoff
Wydawca is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Wydawca is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with wydawca. If not, see <http://www.gnu.org/licenses/>. */
#include "wydawca.h"
int
wydawca_userprivs (uid_t uid, gid_t gid, gid_t *grplist, size_t ngrp)
{
int rc = 0;
if (uid == 0)
return 0;
/* Reset group permissions */
if (geteuid () == 0 && setgroups (ngrp, grplist))
{
logmsg (LOG_CRIT, "setgroups(%lu, %lu...): %s",
(unsigned long)ngrp, (unsigned long)grplist[0],
strerror (errno));
return rc;
}
/* Switch to the user's gid. On some OSes the effective gid must
be reset first */
#if defined(HAVE_SETEGID)
if ((rc = setegid (gid)) < 0)
logmsg (LOG_CRIT, "setegid(%lu): %s",
(unsigned long) gid, strerror (errno));
#elif defined(HAVE_SETREGID)
if ((rc = setregid (gid, gid)) < 0)
logmsg (LOG_CRIT, "setregid(%lu,%lu)d: %s",
(unsigned long) gid, (unsigned long) gid, strerror (errno));
#elif defined(HAVE_SETRESGID)
if ((rc = setresgid (gid, gid, gid)) < 0)
logmsg (LOG_CRIT, "setresgid(%lu,%lu,%lu): %s",
(unsigned long) gid, (unsigned long) gid,
(unsigned long) gid,
strerror (errno));
#endif
if (rc == 0 && gid != 0)
{
if ((rc = setgid (gid)) < 0 && getegid () != gid)
logmsg (LOG_CRIT, "setgid(%lu): %s",
(unsigned long) gid, strerror (errno));
if (rc == 0 && getegid () != gid)
{
logmsg (LOG_CRIT, _("cannot set effective gid to %lu"),
(unsigned long) gid);
rc = 1;
}
}
/* Now reset uid */
if (rc == 0 && uid != 0)
{
uid_t euid;
if (setuid (uid)
|| geteuid () != uid
|| (getuid () != uid
&& (geteuid () == 0 || getuid () == 0)))
{
#if defined(HAVE_SETREUID)
if (geteuid () != uid)
{
if (setreuid (uid, -1) < 0)
{
logmsg (LOG_CRIT, "setreuid(%lu,-1): %s",
(unsigned long) uid, strerror (errno));
rc = 1;
}
if (setuid (uid) < 0)
{
logmsg (LOG_CRIT, "setreuid(%lu,-1): %s",
(unsigned long) uid, strerror (errno));
rc = 1;
}
}
else
#endif
{
logmsg (LOG_CRIT, "setuid(%lu): %s",
(unsigned long) uid, strerror (errno));
rc = 1;
}
}
euid = geteuid ();
if (uid != 0 && setuid (0) == 0)
{
logmsg (LOG_CRIT, _("seteuid(0) succeeded when it should not"));
rc = 1;
}
else if (uid != euid && setuid (euid) == 0)
{
logmsg (LOG_CRIT, _("cannot drop non-root setuid privileges"));
rc = 1;
}
}
return rc;
}
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