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code.delx.au - pulseaudio/blob - src/daemon/caps.c
4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
7 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
9 PulseAudio is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published
11 by the Free Software Foundation; either version 2 of the License,
12 or (at your option) any later version.
14 PulseAudio is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with PulseAudio; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
32 #include <sys/types.h>
33 #include <pulsecore/macro.h>
35 #ifdef HAVE_SYS_CAPABILITY_H
36 #include <sys/capability.h>
38 #ifdef HAVE_SYS_PRCTL_H
39 #include <sys/prctl.h>
42 #include <pulsecore/core-error.h>
44 #include <pulsecore/log.h>
48 /* Glibc <= 2.2 has broken unistd.h */
49 #if defined(linux) && (__GLIBC__ <= 2 && __GLIBC_MINOR__ <= 2)
50 int setresgid(gid_t r
, gid_t e
, gid_t s
);
51 int setresuid(uid_t r
, uid_t e
, uid_t s
);
56 /* Drop root rights when called SUID root */
57 void pa_drop_root(void) {
60 if (uid
== 0 || geteuid() != 0)
63 pa_log_info("Dropping root priviliges.");
65 #if defined(HAVE_SETRESUID)
66 setresuid(uid
, uid
, uid
);
67 #elif defined(HAVE_SETREUID)
77 void pa_drop_root(void) {
82 #if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
84 /* Limit permitted capabilities set to CAPSYS_NICE */
85 int pa_limit_caps(void) {
88 cap_value_t nice_cap
= CAP_SYS_NICE
;
93 cap_set_flag(caps
, CAP_EFFECTIVE
, 1, &nice_cap
, CAP_SET
);
94 cap_set_flag(caps
, CAP_PERMITTED
, 1, &nice_cap
, CAP_SET
);
96 if (cap_set_proc(caps
) < 0)
99 if (prctl(PR_SET_KEEPCAPS
, 1, 0, 0, 0) < 0)
102 pa_log_info("Dropped capabilities successfully.");
112 /* Drop all capabilities, effectively becoming a normal user */
113 int pa_drop_caps(void) {
122 prctl(PR_SET_KEEPCAPS
, 0, 0, 0, 0);
124 if (cap_set_proc(caps
) < 0) {
125 pa_log("Failed to drop capabilities: %s", pa_cstrerror(errno
));
139 /* NOOPs in case capabilities are not available. */
140 int pa_limit_caps(void) {
144 int pa_drop_caps(void) {