mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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4d88fcd59d
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1455 fefdeb5f-60dc-0310-8127-8f9354f1896f
149 lines
2.9 KiB
C
149 lines
2.9 KiB
C
/* $Id$ */
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <assert.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_CAPABILITY_H
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#include <sys/capability.h>
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#endif
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#ifdef HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#endif
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#include <pulsecore/core-error.h>
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#include <pulsecore/log.h>
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#include "caps.h"
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/* Glibc <= 2.2 has broken unistd.h */
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#if defined(linux) && (__GLIBC__ <= 2 && __GLIBC_MINOR__ <= 2)
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int setresgid(gid_t r, gid_t e, gid_t s);
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int setresuid(uid_t r, uid_t e, uid_t s);
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#endif
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#ifdef HAVE_GETUID
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/* Drop root rights when called SUID root */
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void pa_drop_root(void) {
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uid_t uid = getuid();
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if (uid == 0 || geteuid() != 0)
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return;
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pa_log_info("dropping root rights.");
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#if defined(HAVE_SETRESUID)
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setresuid(uid, uid, uid);
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#elif defined(HAVE_SETREUID)
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setreuid(uid, uid);
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#else
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setuid(uid);
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seteuid(uid);
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#endif
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}
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#else
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void pa_drop_root(void) {
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}
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#endif
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#if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
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/* Limit permitted capabilities set to CAPSYS_NICE */
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int pa_limit_caps(void) {
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int r = -1;
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cap_t caps;
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cap_value_t nice_cap = CAP_SYS_NICE;
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caps = cap_init();
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assert(caps);
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cap_clear(caps);
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cap_set_flag(caps, CAP_PERMITTED, 1, &nice_cap, CAP_SET);
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if (cap_set_proc(caps) < 0)
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goto fail;
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if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0)
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goto fail;
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pa_log_info("dropped capabilities successfully.");
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r = 1;
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fail:
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cap_free(caps);
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return r;
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}
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/* Drop all capabilities, effectively becoming a normal user */
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int pa_drop_caps(void) {
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cap_t caps;
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int r = -1;
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caps = cap_init();
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assert(caps);
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cap_clear(caps);
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prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0);
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if (cap_set_proc(caps) < 0) {
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pa_log("failed to drop capabilities: %s", pa_cstrerror(errno));
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goto fail;
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}
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r = 0;
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fail:
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cap_free(caps);
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return r;
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}
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#else
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/* NOOPs in case capabilities are not available. */
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int pa_limit_caps(void) {
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return 0;
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}
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int pa_drop_caps(void) {
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pa_drop_root();
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return 0;
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}
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#endif
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