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sys_netbsd: allow running without root privileges

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On NetBSD programs with write access to /dev/clockctl can adjust or set
the system clock without the root privileges. Add a function to drop the
privileges and check if the process has write access to the device to
get a more descriptive error message when the chrony uid/gid doesn't
match the owner of the device.
This commit is contained in:
Miroslav Lichvar
2015-08-25 12:15:58 +02:00
parent 8854c00d48
commit 7b6435b2b8
4 changed files with 36 additions and 0 deletions
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24
sys_netbsd.c
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@@ -324,5 +324,29 @@ SYS_NetBSD_Finalise(void)
/* ================================================== */
#ifdef FEAT_PRIVDROP
void
SYS_NetBSD_DropRoot(uid_t uid, gid_t gid)
{
int fd;
if (setgroups(0, NULL))
LOG_FATAL(LOGF_SysNetBSD, "setgroups() failed : %s", strerror(errno));
if (setgid(gid))
LOG_FATAL(LOGF_SysNetBSD, "setgid(%d) failed : %s", gid, strerror(errno));
if (setuid(uid))
LOG_FATAL(LOGF_SysNetBSD, "setuid(%d) failed : %s", uid, strerror(errno));
DEBUG_LOG(LOGF_SysNetBSD, "Root dropped to uid %d gid %d", uid, gid);
/* Check if we have write access to /dev/clockctl */
fd = open("/dev/clockctl", O_WRONLY);
if (fd < 0)
LOG_FATAL(LOGF_SysNetBSD, "Can't write to /dev/clockctl");
close(fd);
}
#endif
#endif /* NETBSD */