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units: make use of the new !! ExecStart= prefix in systemd-resolved.service

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Let's make use of !! to run resolved with ambient capabilities on
systems supporting them.
This commit is contained in:
Lennart Poettering 2017-08-09 16:15:07 +02:00
parent 165a31c0db
commit 635f3df5dc
2 changed files with 18 additions and 10 deletions
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19
src/resolve/resolved.c
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@ -67,13 +67,18 @@ int main(int argc, char *argv[]) {
goto finish;
}
/* Drop privileges, but keep three caps. Note that we drop those too, later on (see below) */
r = drop_privileges(uid, gid,
(UINT64_C(1) << CAP_NET_RAW)| /* needed for SO_BINDTODEVICE */
(UINT64_C(1) << CAP_NET_BIND_SERVICE)| /* needed to bind on port 53 */
(UINT64_C(1) << CAP_SETPCAP) /* needed in order to drop the caps later */);
if (r < 0)
goto finish;
/* Drop privileges, but only if we have been started as root. If we are not running as root we assume all
* privileges are already dropped. */
if (getuid() == 0) {
/* Drop privileges, but keep three caps. Note that we drop those too, later on (see below) */
r = drop_privileges(uid, gid,
(UINT64_C(1) << CAP_NET_RAW)| /* needed for SO_BINDTODEVICE */
(UINT64_C(1) << CAP_NET_BIND_SERVICE)| /* needed to bind on port 53 */
(UINT64_C(1) << CAP_SETPCAP) /* needed in order to drop the caps later */);
if (r < 0)
goto finish;
}
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGUSR1, SIGUSR2, -1) >= 0);

9
units/systemd-resolved.service.in
View file

@ -19,9 +19,11 @@ Wants=nss-lookup.target
Type=notify
Restart=always
RestartSec=0
ExecStart=@rootlibexecdir@/systemd-resolved
ExecStart=!!@rootlibexecdir@/systemd-resolved
WatchdogSec=3min
CapabilityBoundingSet=CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_CHOWN CAP_DAC_OVERRIDE CAP_FOWNER CAP_NET_RAW CAP_NET_BIND_SERVICE
User=systemd-resolve
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=strict
@ -34,7 +36,8 @@ RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallArchitectures=native
ReadWritePaths=/run/systemd
RuntimeDirectory=systemd/resolve
RuntimeDirectoryPreserve=yes
[Install]
WantedBy=multi-user.target