selinux: split up mac_selinux_have() from mac_selinux_use()

Let's distuingish the cases where our code takes an active role in
selinux management, or just passively reports whatever selinux
properties are set.

mac_selinux_have() now checks whether selinux is around for the passive
stuff, and mac_selinux_use() for the active stuff. The latter checks the
former, plus also checks UID == 0, under the assumption that only when
we run priviliged selinux management really makes sense.

Fixes: #1941

4 files changed, 4 insertions, 4 deletions

diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
index 69a685c06f..371df5b37f 100644
--- a/src/journal/journald-native.c
+++ b/src/journal/journald-native.c
@@ -480,7 +480,7 @@ int server_open_native_socket(Server*s) {
                 return log_error_errno(errno, "SO_PASSCRED failed: %m");
 
 #ifdef HAVE_SELINUX
-        if (mac_selinux_use()) {
+        if (mac_selinux_have()) {
                 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
                 if (r < 0)
                         log_warning_errno(errno, "SO_PASSSEC failed: %m");
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 7d11a568aa..eb17f413f2 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -707,7 +707,7 @@ static void dispatch_message_real(
                 }
 
 #ifdef HAVE_SELINUX
-                if (mac_selinux_use()) {
+                if (mac_selinux_have()) {
                         if (label) {
                                 x = alloca(strlen("_SELINUX_CONTEXT=") + label_len + 1);
 
diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
index 07a0f1bf41..131fcdac42 100644
--- a/src/journal/journald-stream.c
+++ b/src/journal/journald-stream.c
@@ -493,7 +493,7 @@ static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
         if (r < 0)
                 return log_error_errno(r, "Failed to determine peer credentials: %m");
 
-        if (mac_selinux_use()) {
+        if (mac_selinux_have()) {
                 r = getpeersec(fd, &stream->label);
                 if (r < 0 && r != -EOPNOTSUPP)
                         (void) log_warning_errno(r, "Failed to determine peer security context: %m");
diff --git a/src/journal/journald-syslog.c b/src/journal/journald-syslog.c
index f3ac1a7ae0..cfc50d889b 100644
--- a/src/journal/journald-syslog.c
+++ b/src/journal/journald-syslog.c
@@ -415,7 +415,7 @@ int server_open_syslog_socket(Server *s) {
                 return log_error_errno(errno, "SO_PASSCRED failed: %m");
 
 #ifdef HAVE_SELINUX
-        if (mac_selinux_use()) {
+        if (mac_selinux_have()) {
                 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
                 if (r < 0)
                         log_warning_errno(errno, "SO_PASSSEC failed: %m");