-/* $Id$ */
-
/***
- This file is part of polypaudio.
-
- polypaudio is free software; you can redistribute it and/or modify
+ This file is part of PulseAudio.
+
+ Copyright 2004-2006 Lennart Poettering
+ Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+ PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2 of the License,
+ by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
-
- polypaudio is distributed in the hope that it will be useful, but
+
+ PulseAudio 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 Lesser General Public License
- along with polypaudio; if not, write to the Free Software
+ along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <config.h>
#endif
-#include <assert.h>
#include <unistd.h>
#include <errno.h>
-#include <string.h>
+#include <sys/types.h>
+
+#include <pulsecore/i18n.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/log.h>
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
-#include <polypcore/log.h>
-
#include "caps.h"
-#ifdef HAVE_GETUID
+/* Glibc <= 2.2 has broken unistd.h */
+#if defined(linux) && (__GLIBC__ <= 2 && __GLIBC_MINOR__ <= 2)
+int setresgid(gid_t r, gid_t e, gid_t s);
+int setresuid(uid_t r, uid_t e, uid_t s);
+#endif
/* Drop root rights when called SUID root */
void pa_drop_root(void) {
- uid_t uid = getuid();
-
- if (uid == 0 || geteuid() != 0)
- return;
- pa_log_info(__FILE__": dropping root rights.\n");
+#ifdef HAVE_GETUID
+ uid_t uid;
+ gid_t gid;
+
+ pa_log_debug(_("Cleaning up privileges."));
+ uid = getuid();
+ gid = getgid();
#if defined(HAVE_SETRESUID)
- setresuid(uid, uid, uid);
+ pa_assert_se(setresuid(uid, uid, uid) >= 0);
+ pa_assert_se(setresgid(gid, gid, gid) >= 0);
#elif defined(HAVE_SETREUID)
- setreuid(uid, uid);
+ pa_assert_se(setreuid(uid, uid) >= 0);
+ pa_assert_se(setregid(gid, gid) >= 0);
#else
- setuid(uid);
- seteuid(uid);
+ pa_assert_se(setuid(uid) >= 0);
+ pa_assert_se(seteuid(uid) >= 0);
+ pa_assert_se(setgid(gid) >= 0);
+ pa_assert_se(setegid(gid) >= 0);
#endif
-}
-#else
-
-void pa_drop_root(void) {
-}
+ pa_assert_se(getuid() == uid);
+ pa_assert_se(geteuid() == uid);
+ pa_assert_se(getgid() == gid);
+ pa_assert_se(getegid() == gid);
+ if (uid != 0)
+ pa_drop_caps();
#endif
-
-#ifdef HAVE_SYS_CAPABILITY_H
-
-/* Limit capabilities set to CAPSYS_NICE */
-int pa_limit_caps(void) {
- int r = -1;
- cap_t caps;
- cap_value_t nice_cap = CAP_SYS_NICE;
-
- caps = cap_init();
- assert(caps);
-
- cap_clear(caps);
-
- cap_set_flag(caps, CAP_EFFECTIVE, 1, &nice_cap, CAP_SET);
- cap_set_flag(caps, CAP_PERMITTED, 1, &nice_cap, CAP_SET);
-
- if (cap_set_proc(caps) < 0)
- goto fail;
-
- pa_log_info(__FILE__": dropped capabilities successfully.\n");
-
- r = 0;
-
-fail:
- cap_free (caps);
-
- return r;
}
-/* Drop all capabilities, effectively becoming a normal user */
-int pa_drop_caps(void) {
+void pa_drop_caps(void) {
+#ifdef HAVE_SYS_CAPABILITY_H
+#ifdef __linux
cap_t caps;
- int r = -1;
-
- caps = cap_init();
- assert(caps);
-
- cap_clear(caps);
-
- if (cap_set_proc(caps) < 0) {
- pa_log(__FILE__": failed to drop capabilities: %s\n", strerror(errno));
- goto fail;
- }
-
- r = 0;
-
-fail:
- cap_free (caps);
-
- return r;
-}
-
+ pa_assert_se(caps = cap_init());
+ pa_assert_se(cap_clear(caps) == 0);
+ pa_assert_se(cap_set_proc(caps) == 0);
+ pa_assert_se(cap_free(caps) == 0);
+#elif __FreeBSD__
+ pa_assert_se (cap_enter () == 0);
#else
-
-/* NOOPs in case capabilities are not available. */
-int pa_limit_caps(void) {
- return 0;
-}
-
-int pa_drop_caps(void) {
- pa_drop_root();
- return 0;
-}
-
+#error Don't know how to do capabilities on your system. Please send a patch.
+#endif /* __linux */
+#else /* HAVE_SYS_CAPABILITY_H */
+ pa_log_warn("Normally all extra capabilities would be dropped now, but "
+ "that's impossible because this Pulseaudio was built without "
+ "libcap support.");
#endif
-
+}