selinux: simplify and unify logging

[elogind.git] / src / shared / selinux-util.c

diff --git a/src/shared/selinux-util.c b/src/shared/selinux-util.c
index 9707d0cefa903cf92c967ff6a3b78f21906b809d..76d3916ea74360068f18521a7df7b41f223f3a72 100644 (file)
--- a/src/shared/selinux-util.c
+++ b/src/shared/selinux-util.c
@@ -42,6 +42,8 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
 
 static int cached_use = -1;
 static struct selabel_handle *label_hnd = NULL;
+
+#define log_enforcing(...) log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, __VA_ARGS__)
 #endif
 
 bool mac_selinux_use(void) {
@@ -87,8 +89,7 @@ int mac_selinux_init(const char *prefix) {
                 label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
 
         if (!label_hnd) {
-                log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
-                         "Failed to initialize SELinux context: %m");
+                log_enforcing("Failed to initialize SELinux context: %m");
                 r = security_getenforce() == 1 ? -errno : 0;
         } else  {
                 char timespan[FORMAT_TIMESPAN_MAX];
@@ -147,7 +148,7 @@ int mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
                 if (ignore_erofs && errno == EROFS)
                         return 0;
 
-                log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, "Unable to fix SELinux label of %s: %m", path);
+                log_enforcing("Unable to fix SELinux label of %s: %m", path);
                 r = security_getenforce() == 1 ? -errno : 0;
         }
 #endif
@@ -166,34 +167,30 @@ void mac_selinux_finish(void) {
 }
 
 int mac_selinux_get_create_label_from_exe(const char *exe, char **label) {
-
-        int r = 0;
+        int r = -EOPNOTSUPP;
 
 #ifdef HAVE_SELINUX
         _cleanup_security_context_free_ security_context_t mycon = NULL, fcon = NULL;
         security_class_t sclass;
 
-        if (!mac_selinux_use()) {
-                *label = NULL;
-                return 0;
-        }
+        assert(exe);
+        assert(label);
+
+        if (!mac_selinux_use())
+                return -EOPNOTSUPP;
 
         r = getcon(&mycon);
         if (r < 0)
-                goto fail;
+                return -errno;
 
         r = getfilecon(exe, &fcon);
         if (r < 0)
-                goto fail;
+                return -errno;
 
         sclass = string_to_security_class("process");
         r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
-        if (r == 0)
-                log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
-
-fail:
-        if (r < 0 && security_getenforce() == 1)
-                r = -errno;
+        if (r < 0)
+                return -errno;
 #endif
 
         return r;
@@ -202,14 +199,15 @@ fail:
 int mac_selinux_get_our_label(char **label) {
         int r = -EOPNOTSUPP;
 
+        assert(label);
+
 #ifdef HAVE_SELINUX
-        char *l = NULL;
+        if (!mac_selinux_use())
+                return -EOPNOTSUPP;
 
-        r = getcon(&l);
+        r = getcon(label);
         if (r < 0)
-                return r;
-
-        *label = l;
+                return -errno;
 #endif
 
         return r;
@@ -219,91 +217,65 @@ int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, char **label
         int r = -EOPNOTSUPP;
 
 #ifdef HAVE_SELINUX
-
-        _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = NULL;
+        _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL;
         _cleanup_context_free_ context_t pcon = NULL, bcon = NULL;
         security_class_t sclass;
-
         const char *range = NULL;
 
         assert(socket_fd >= 0);
         assert(exe);
         assert(label);
 
+        if (!mac_selinux_use())
+                return -EOPNOTSUPP;
+
         r = getcon(&mycon);
-        if (r < 0) {
-                r = -EINVAL;
-                goto out;
-        }
+        if (r < 0)
+                return -errno;
 
         r = getpeercon(socket_fd, &peercon);
-        if (r < 0) {
-                r = -EINVAL;
-                goto out;
-        }
+        if (r < 0)
+                return -errno;
 
         r = getexeccon(&fcon);
-        if (r < 0) {
-                r = -EINVAL;
-                goto out;
-        }
+        if (r < 0)
+                return -errno;
 
         if (!fcon) {
                 /* If there is no context set for next exec let's use context
                    of target executable */
                 r = getfilecon(exe, &fcon);
-                if (r < 0) {
-                        r = -errno;
-                        goto out;
-                }
+                if (r < 0)
+                        return -errno;
         }
 
         bcon = context_new(mycon);
-        if (!bcon) {
-                r = -ENOMEM;
-                goto out;
-        }
+        if (!bcon)
+                return -ENOMEM;
 
         pcon = context_new(peercon);
-        if (!pcon) {
-                r = -ENOMEM;
-                goto out;
-        }
+        if (!pcon)
+                return -ENOMEM;
 
         range = context_range_get(pcon);
-        if (!range) {
-                r = -errno;
-                goto out;
-        }
+        if (!range)
+                return -errno;
 
         r = context_range_set(bcon, range);
-        if (r) {
-                r = -errno;
-                goto out;
-        }
+        if (r)
+                return -errno;
 
         freecon(mycon);
         mycon = strdup(context_str(bcon));
-        if (!mycon) {
-                r = -errno;
-                goto out;
-        }
+        if (!mycon)
+                return -ENOMEM;
 
         sclass = string_to_security_class("process");
-        r = security_compute_create(mycon, fcon, sclass, &ret);
-        if (r < 0) {
-                r = -EINVAL;
-                goto out;
-        }
-
-        *label = ret;
-        ret = NULL;
-        r = 0;
-
-out:
-        if (r < 0 && security_getenforce() == 1)
-                return r;
+        r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
+        if (r < 0)
+                return -errno;
 #endif
+
         return r;
 }
 
@@ -313,7 +285,7 @@ int mac_selinux_context_set(const char *path, mode_t mode) {
 #ifdef HAVE_SELINUX
         _cleanup_security_context_free_ security_context_t filecon = NULL;
 
-        if (!mac_selinux_use() || !label_hnd)
+        if (!label_hnd)
                 return 0;
 
         r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
@@ -322,7 +294,7 @@ int mac_selinux_context_set(const char *path, mode_t mode) {
         else if (r == 0) {
                 r = setfscreatecon(filecon);
                 if (r < 0) {
-                        log_error("Failed to set SELinux file context on %s: %m", path);
+                        log_enforcing("Failed to set SELinux file context on %s: %m", path);
                         r = -errno;
                 }
         }
@@ -341,8 +313,7 @@ int mac_selinux_socket_set(const char *label) {
                 return 0;
 
         if (setsockcreatecon((security_context_t) label) < 0) {
-                log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
-                         "Failed to set SELinux context (%s) on socket: %m", label);
+                log_enforcing("Failed to set SELinux context (%s) on socket: %m", label);
 
                 if (security_getenforce() == 1)
                         return -errno;
@@ -412,7 +383,7 @@ int mac_selinux_mkdir(const char *path, mode_t mode) {
                 r = setfscreatecon(fcon);
 
         if (r < 0 && errno != ENOENT) {
-                log_error("Failed to set security context %s for %s: %m", fcon, path);
+                log_enforcing("Failed to set security context %s for %s: %m", fcon, path);
 
                 if (security_getenforce() == 1) {
                         r = -errno;
@@ -479,7 +450,7 @@ int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
                 r = setfscreatecon(fcon);
 
         if (r < 0 && errno != ENOENT) {
-                log_error("Failed to set security context %s for %s: %m", fcon, path);
+                log_enforcing("Failed to set security context %s for %s: %m", fcon, path);
 
                 if (security_getenforce() == 1) {
                         r = -errno;