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.
PulseAudio is distributed in the hope that it will be useful, but
#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
-#ifdef HAVE_SYS_PRCTL_H
-#include <sys/prctl.h>
-#endif
-
-#include <pulsecore/core-error.h>
-
-#include <pulsecore/log.h>
#include "caps.h"
int setresuid(uid_t r, uid_t e, uid_t s);
#endif
-#ifdef HAVE_GETUID
-
/* Drop root rights when called SUID root */
void pa_drop_root(void) {
- uid_t uid = getuid();
- if (uid == 0 || geteuid() != 0)
- return;
+#ifdef HAVE_GETUID
+ uid_t uid;
+ gid_t gid;
- pa_log_info("Dropping root priviliges.");
+ pa_log_debug(_("Cleaning up privileges."));
+ uid = getuid();
+ gid = getgid();
#if defined(HAVE_SETRESUID)
pa_assert_se(setresuid(uid, uid, uid) >= 0);
+ pa_assert_se(setresgid(gid, gid, gid) >= 0);
#elif defined(HAVE_SETREUID)
pa_assert_se(setreuid(uid, uid) >= 0);
+ pa_assert_se(setregid(gid, gid) >= 0);
#else
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
pa_assert_se(getuid() == uid);
pa_assert_se(geteuid() == uid);
-}
-
-#else
-
-void pa_drop_root(void) {
-}
+ pa_assert_se(getgid() == gid);
+ pa_assert_se(getegid() == gid);
+ if (uid != 0)
+ pa_drop_caps();
#endif
-
-#if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
-
-/* Limit permitted capabilities set to CAPSYS_NICE */
-void pa_limit_caps(void) {
- cap_t caps;
- cap_value_t nice_cap = CAP_SYS_NICE;
-
- pa_assert_se(caps = cap_init());
- pa_assert_se(cap_clear(caps) == 0);
- pa_assert_se(cap_set_flag(caps, CAP_EFFECTIVE, 1, &nice_cap, CAP_SET) == 0);
- pa_assert_se(cap_set_flag(caps, CAP_PERMITTED, 1, &nice_cap, CAP_SET) == 0);
- pa_assert_se(cap_set_proc(caps) == 0);
-
- pa_assert_se(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == 0);
-
- pa_log_info("Dropped capabilities successfully.");
-
- pa_assert_se(cap_free(caps) == 0);
}
-/* Drop all capabilities, effectively becoming a normal user */
void pa_drop_caps(void) {
+#ifdef HAVE_SYS_CAPABILITY_H
+#if defined(__linux)
cap_t caps;
-
- pa_assert_se(prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0) == 0);
-
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 defined(__FreeBSD__)
+ pa_assert_se (cap_enter () == 0);
#else
-
-/* NOOPs in case capabilities are not available. */
-void pa_limit_caps(void) {
- return 0;
-}
-
-void pa_drop_caps(void) {
- pa_drop_root();
-}
-
+#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 PulseAudio was built without "
+ "capabilities support.");
#endif
+}