-/* $Id$ */
-
/***
This file is part of PulseAudio.
#include <config.h>
#endif
-#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
-#ifdef HAVE_SYS_CAPABILITY_H
-#include <sys/capability.h>
-#endif
+#include <pulse/i18n.h>
+#include <pulsecore/macro.h>
#include <pulsecore/core-error.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 "caps.h"
/* Glibc <= 2.2 has broken unistd.h */
if (uid == 0 || geteuid() != 0)
return;
- pa_log_info("dropping root rights.");
+ pa_log_info(_("Dropping root priviliges."));
#if defined(HAVE_SETRESUID)
- setresuid(uid, uid, uid);
+ pa_assert_se(setresuid(uid, uid, uid) >= 0);
#elif defined(HAVE_SETREUID)
- setreuid(uid, uid);
+ pa_assert_se(setreuid(uid, uid) >= 0);
#else
- setuid(uid);
- seteuid(uid);
+ pa_assert_se(setuid(uid) >= 0);
+ pa_assert_se(seteuid(uid) >= 0);
#endif
+
+ pa_assert_se(getuid() == uid);
+ pa_assert_se(geteuid() == uid);
}
#else
#endif
-#ifdef HAVE_SYS_CAPABILITY_H
+#if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
-/* Limit capabilities set to CAPSYS_NICE */
-int pa_limit_caps(void) {
- int r = -1;
+/* Limit permitted capabilities set to CAPSYS_NICE */
+void pa_limit_caps(void) {
cap_t caps;
cap_value_t nice_cap = CAP_SYS_NICE;
- /* Only drop caps when called SUID */
- if (getuid() == 0)
- return 0;
-
- 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);
+ 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);
if (cap_set_proc(caps) < 0)
- goto fail;
-
- pa_log_info("dropped capabilities successfully.");
+ /* Hmm, so we couldn't limit our caps, which probably means we
+ * hadn't any in the first place, so let's just make sure of
+ * that */
+ pa_drop_caps();
+ else
+ pa_log_info(_("Limited capabilities successfully to CAP_SYS_NICE."));
- r = 0;
+ pa_assert_se(cap_free(caps) == 0);
-fail:
- cap_free (caps);
-
- return r;
+ pa_assert_se(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == 0);
}
/* Drop all capabilities, effectively becoming a normal user */
-int pa_drop_caps(void) {
+void pa_drop_caps(void) {
cap_t caps;
- int r = -1;
- /* Only drop caps when called SUID */
- if (getuid() == 0)
- return 0;
+#ifndef __OPTIMIZE__
+ /* Valgrind doesn't not know set_caps, so we bypass it here -- but
+ * only in development builds.*/
- caps = cap_init();
- assert(caps);
+ if (pa_in_valgrind() && !pa_have_caps())
+ return;
+#endif
- cap_clear(caps);
+ pa_assert_se(prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0) == 0);
- if (cap_set_proc(caps) < 0) {
- pa_log("failed to drop capabilities: %s", pa_cstrerror(errno));
- goto fail;
- }
+ 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);
- r = 0;
+ pa_assert_se(!pa_have_caps());
+}
-fail:
- cap_free (caps);
+pa_bool_t pa_have_caps(void) {
+ cap_t caps;
+ cap_flag_value_t flag = CAP_CLEAR;
- return r;
+#ifdef __OPTIMIZE__
+ pa_assert_se(caps = cap_get_proc());
+#else
+ if (!(caps = cap_get_proc()))
+ return FALSE;
+#endif
+ pa_assert_se(cap_get_flag(caps, CAP_SYS_NICE, CAP_EFFECTIVE, &flag) >= 0);
+ pa_assert_se(cap_free(caps) == 0);
+
+ return flag == CAP_SET;
}
#else
/* NOOPs in case capabilities are not available. */
-int pa_limit_caps(void) {
- return 0;
+void pa_limit_caps(void) {
}
-int pa_drop_caps(void) {
+void pa_drop_caps(void) {
pa_drop_root();
- return 0;
}
-#endif
+pa_bool_t pa_have_caps(void) {
+ return FALSE;
+}
+#endif