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daemon: strip all special suid/caps log from our startup code, we'll now rely on RealtimeKit for all high-priority/RT scheduling policy issues

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This commit is contained in:
Lennart Poettering 2009-06-19 17:37:18 +02:00
parent bacc5ca6f4
commit 9c438bcac6
4 changed files with 31 additions and 285 deletions
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99
src/daemon/caps.c
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@ -39,6 +39,7 @@
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
@ -51,12 +52,13 @@ int setresgid(gid_t r, gid_t e, gid_t s);
int setresuid(uid_t r, uid_t e, uid_t s);
#endif
#ifdef HAVE_GETUID
/* Drop root rights when called SUID root */
void pa_drop_root(void) {
uid_t uid = getuid();
#ifdef HAVE_GETUID
uid_t uid;
uid = getuid();
if (uid == 0 || geteuid() != 0)
return;
@ -73,90 +75,19 @@ void pa_drop_root(void) {
pa_assert_se(getuid() == uid);
pa_assert_se(geteuid() == uid);
}
#else
void pa_drop_root(void) {
}
#endif
#if defined(HAVE_SYS_CAPABILITY_H) && defined(HAVE_SYS_PRCTL_H)
/* Limit permitted capabilities set to CAPSYS_NICE */
void pa_limit_caps(void) {
cap_t caps;
cap_value_t nice_cap = CAP_SYS_NICE;
pa_assert_se(caps = cap_init());
pa_assert_se(cap_clear(caps) == 0);
pa_assert_se(cap_set_flag(caps, CAP_EFFECTIVE, 1, &nice_cap, CAP_SET) == 0);
pa_assert_se(cap_set_flag(caps, CAP_PERMITTED, 1, &nice_cap, CAP_SET) == 0);
if (cap_set_proc(caps) < 0)
/* Hmm, so we couldn't limit our caps, which probably means we
* hadn't any in the first place, so let's just make sure of
* that */
pa_drop_caps();
else
pa_log_info(_("Limited capabilities successfully to CAP_SYS_NICE."));
pa_assert_se(cap_free(caps) == 0);
pa_assert_se(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == 0);
}
/* Drop all capabilities, effectively becoming a normal user */
void pa_drop_caps(void) {
cap_t caps;
#ifndef __OPTIMIZE__
/* Valgrind doesn't not know set_caps, so we bypass it here -- but
* only in development builds.*/
if (pa_in_valgrind() && !pa_have_caps())
return;
#endif
#ifdef HAVE_SYS_PRCTL_H
pa_assert_se(prctl(PR_SET_KEEPCAPS, 0, 0, 0, 0) == 0);
pa_assert_se(caps = cap_init());
pa_assert_se(cap_clear(caps) == 0);
pa_assert_se(cap_set_proc(caps) == 0);
pa_assert_se(cap_free(caps) == 0);
pa_assert_se(!pa_have_caps());
}
pa_bool_t pa_have_caps(void) {
cap_t caps;
cap_flag_value_t flag = CAP_CLEAR;
#ifdef __OPTIMIZE__
pa_assert_se(caps = cap_get_proc());
#else
if (!(caps = cap_get_proc()))
return FALSE;
#endif
pa_assert_se(cap_get_flag(caps, CAP_SYS_NICE, CAP_EFFECTIVE, &flag) >= 0);
pa_assert_se(cap_free(caps) == 0);
return flag == CAP_SET;
}
#else
/* NOOPs in case capabilities are not available. */
void pa_limit_caps(void) {
}
void pa_drop_caps(void) {
pa_drop_root();
}
pa_bool_t pa_have_caps(void) {
return FALSE;
}
#ifdef HAVE_SYS_CAPABILITY_H
{
cap_t caps;
pa_assert_se(caps = cap_init());
pa_assert_se(cap_clear(caps) == 0);
pa_assert_se(cap_set_proc(caps) == 0);
pa_assert_se(cap_free(caps) == 0);
}
#endif
}