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code.delx.au - pulseaudio/blob - src/daemon/caps.c
4 This file is part of PulseAudio.
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <sys/types.h>
32 #ifdef HAVE_SYS_CAPABILITY_H
33 #include <sys/capability.h>
36 #include <pulsecore/core-error.h>
38 #include <pulsecore/log.h>
42 /* Glibc <= 2.2 has broken unistd.h */
43 #if defined(linux) && (__GLIBC__ <= 2 && __GLIBC_MINOR__ <= 2)
44 int setresgid(gid_t r
, gid_t e
, gid_t s
);
45 int setresuid(uid_t r
, uid_t e
, uid_t s
);
50 /* Drop root rights when called SUID root */
51 void pa_drop_root(void) {
54 if (uid
== 0 || geteuid() != 0)
57 pa_log_info(__FILE__
": dropping root rights.");
59 #if defined(HAVE_SETRESUID)
60 setresuid(uid
, uid
, uid
);
61 #elif defined(HAVE_SETREUID)
71 void pa_drop_root(void) {
76 #ifdef HAVE_SYS_CAPABILITY_H
78 /* Limit capabilities set to CAPSYS_NICE */
79 int pa_limit_caps(void) {
82 cap_value_t nice_cap
= CAP_SYS_NICE
;
84 /* Only drop caps when called SUID */
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 pa_log_info(__FILE__
": dropped capabilities successfully.");
109 /* Drop all capabilities, effectively becoming a normal user */
110 int pa_drop_caps(void) {
114 /* Only drop caps when called SUID */
123 if (cap_set_proc(caps
) < 0) {
124 pa_log(__FILE__
": failed to drop capabilities: %s", pa_cstrerror(errno
));
138 /* NOOPs in case capabilities are not available. */
139 int pa_limit_caps(void) {
143 int pa_drop_caps(void) {