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code.delx.au - pulseaudio/blob - src/daemon/caps.c
b9e49fc153d2912b79ff18360a45157baf24a98a
2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 2 of the License,
10 or (at your option) any later version.
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with PulseAudio; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <sys/types.h>
31 #include <pulsecore/macro.h>
33 #ifdef HAVE_SYS_CAPABILITY_H
34 #include <sys/capability.h>
36 #ifdef HAVE_SYS_PRCTL_H
37 #include <sys/prctl.h>
40 #include <pulsecore/core-error.h>
42 #include <pulsecore/log.h>
46 /* Glibc <= 2.2 has broken unistd.h */
47 #if defined(linux) && (__GLIBC__ <= 2 && __GLIBC_MINOR__ <= 2)
48 int setresgid(gid_t r
, gid_t e
, gid_t s
);
49 int setresuid(uid_t r
, uid_t e
, uid_t s
);
54 /* Drop root rights when called SUID root */
55 void pa_drop_root(void) {
58 if (uid
== 0 || geteuid() != 0)
61 pa_log_info("Dropping root priviliges.");
63 #if defined(HAVE_SETRESUID)
64 pa_assert_se(setresuid(uid
, uid
, uid
) >= 0);
65 #elif defined(HAVE_SETREUID)
66 pa_assert_se(setreuid(uid
, uid
) >= 0);
68 pa_assert_se(setuid(uid
) >= 0);
69 pa_assert_se(seteuid(uid
) >= 0);
72 pa_assert_se(getuid() == uid
);
73 pa_assert_se(geteuid() == uid
);
78 void pa_drop_root(void) {
83 #if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
85 /* Limit permitted capabilities set to CAPSYS_NICE */
86 void pa_limit_caps(void) {
88 cap_value_t nice_cap
= CAP_SYS_NICE
;
90 pa_assert_se(caps
= cap_init());
91 pa_assert_se(cap_clear(caps
) == 0);
92 pa_assert_se(cap_set_flag(caps
, CAP_EFFECTIVE
, 1, &nice_cap
, CAP_SET
) == 0);
93 pa_assert_se(cap_set_flag(caps
, CAP_PERMITTED
, 1, &nice_cap
, CAP_SET
) == 0);
94 pa_assert_se(cap_set_proc(caps
) == 0);
96 pa_assert_se(prctl(PR_SET_KEEPCAPS
, 1, 0, 0, 0) == 0);
98 pa_log_info("Dropped capabilities successfully.");
100 pa_assert_se(cap_free(caps
) == 0);
103 /* Drop all capabilities, effectively becoming a normal user */
104 void pa_drop_caps(void) {
107 pa_assert_se(prctl(PR_SET_KEEPCAPS
, 0, 0, 0, 0) == 0);
109 pa_assert_se(caps
= cap_init());
110 pa_assert_se(cap_clear(caps
) == 0);
111 pa_assert_se(cap_set_proc(caps
) == 0);
112 pa_assert_se(cap_free(caps
) == 0);
117 /* NOOPs in case capabilities are not available. */
118 void pa_limit_caps(void) {
122 void pa_drop_caps(void) {