]>
code.delx.au - pulseaudio/blob - src/daemon/caps.c
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>
32 #include <pulse/i18n.h>
34 #include <pulsecore/macro.h>
35 #include <pulsecore/core-error.h>
36 #include <pulsecore/log.h>
37 #include <pulsecore/core-util.h>
39 #ifdef HAVE_SYS_CAPABILITY_H
40 #include <sys/capability.h>
42 #ifdef HAVE_SYS_PRCTL_H
43 #include <sys/prctl.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 privileges."));
65 #if defined(HAVE_SETRESUID)
66 pa_assert_se(setresuid(uid
, uid
, uid
) >= 0);
67 #elif defined(HAVE_SETREUID)
68 pa_assert_se(setreuid(uid
, uid
) >= 0);
70 pa_assert_se(setuid(uid
) >= 0);
71 pa_assert_se(seteuid(uid
) >= 0);
74 pa_assert_se(getuid() == uid
);
75 pa_assert_se(geteuid() == uid
);
80 void pa_drop_root(void) {
85 #if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
87 /* Limit permitted capabilities set to CAPSYS_NICE */
88 void pa_limit_caps(void) {
90 cap_value_t nice_cap
= CAP_SYS_NICE
;
92 pa_assert_se(caps
= cap_init());
93 pa_assert_se(cap_clear(caps
) == 0);
94 pa_assert_se(cap_set_flag(caps
, CAP_EFFECTIVE
, 1, &nice_cap
, CAP_SET
) == 0);
95 pa_assert_se(cap_set_flag(caps
, CAP_PERMITTED
, 1, &nice_cap
, CAP_SET
) == 0);
97 if (cap_set_proc(caps
) < 0)
98 /* Hmm, so we couldn't limit our caps, which probably means we
99 * hadn't any in the first place, so let's just make sure of
103 pa_log_info(_("Limited capabilities successfully to CAP_SYS_NICE."));
105 pa_assert_se(cap_free(caps
) == 0);
107 pa_assert_se(prctl(PR_SET_KEEPCAPS
, 1, 0, 0, 0) == 0);
110 /* Drop all capabilities, effectively becoming a normal user */
111 void pa_drop_caps(void) {
115 /* Valgrind doesn't not know set_caps, so we bypass it here -- but
116 * only in development builds.*/
118 if (pa_in_valgrind() && !pa_have_caps())
122 pa_assert_se(prctl(PR_SET_KEEPCAPS
, 0, 0, 0, 0) == 0);
124 pa_assert_se(caps
= cap_init());
125 pa_assert_se(cap_clear(caps
) == 0);
126 pa_assert_se(cap_set_proc(caps
) == 0);
127 pa_assert_se(cap_free(caps
) == 0);
129 pa_assert_se(!pa_have_caps());
132 pa_bool_t
pa_have_caps(void) {
134 cap_flag_value_t flag
= CAP_CLEAR
;
137 pa_assert_se(caps
= cap_get_proc());
139 if (!(caps
= cap_get_proc()))
142 pa_assert_se(cap_get_flag(caps
, CAP_SYS_NICE
, CAP_EFFECTIVE
, &flag
) >= 0);
143 pa_assert_se(cap_free(caps
) == 0);
145 return flag
== CAP_SET
;
150 /* NOOPs in case capabilities are not available. */
151 void pa_limit_caps(void) {
154 void pa_drop_caps(void) {
158 pa_bool_t
pa_have_caps(void) {