network/link: Match - filter on kernel cmdline, host and virt

[elogind.git] / src / shared / label.c

diff --git a/src/shared/label.c b/src/shared/label.c
index dce6f45c80a83a0ebb87872b20c822cbccb22dcf..92f10f9f90fb939b63b379ee5160d76650d213b5 100644 (file)
--- a/src/shared/label.c
+++ b/src/shared/label.c
@@ -20,38 +20,29 @@
 ***/
 
 #include <errno.h>
-#include <sys/stat.h>
 #include <unistd.h>
 #include <malloc.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 #include "label.h"
+#include "strv.h"
 #include "util.h"
+#include "path-util.h"
 
 #ifdef HAVE_SELINUX
+#include "selinux-util.h"
 #include <selinux/selinux.h>
 #include <selinux/label.h>
 
 static struct selabel_handle *label_hnd = NULL;
 
-static int use_selinux_cached = -1;
-
-static inline bool use_selinux(void) {
-
-        if (use_selinux_cached < 0)
-                use_selinux_cached = is_selinux_enabled() > 0;
-
-        return use_selinux_cached;
-}
-
-void label_retest_selinux(void) {
-        use_selinux_cached = -1;
-}
-
 #endif
 
-int label_init(void) {
+int label_init(const char *prefix) {
         int r = 0;
 
 #ifdef HAVE_SELINUX
@@ -67,7 +58,15 @@ int label_init(void) {
         before_mallinfo = mallinfo();
         before_timestamp = now(CLOCK_MONOTONIC);
 
-        label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+        if (prefix) {
+                struct selinux_opt options[] = {
+                        { .type = SELABEL_OPT_SUBSET, .value = prefix },
+                };
+
+                label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
+        } else
+                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");
@@ -81,16 +80,16 @@ int label_init(void) {
 
                 l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
 
-                log_info("Successfully loaded SELinux database in %s, size on heap is %iK.",
-                         format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp),
-                         (l+1023)/1024);
+                log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
+                          format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
+                          (l+1023)/1024);
         }
 #endif
 
         return r;
 }
 
-int label_fix(const char *path, bool ignore_enoent) {
+int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
         int r = 0;
 
 #ifdef HAVE_SELINUX
@@ -123,6 +122,9 @@ int label_fix(const char *path, bool ignore_enoent) {
                 if (ignore_enoent && errno == ENOENT)
                         return 0;
 
+                if (ignore_erofs && errno == EROFS)
+                        return 0;
+
                 log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
                          "Unable to fix label of %s: %m", path);
                 r = security_getenforce() == 1 ? -errno : 0;
@@ -135,7 +137,10 @@ int label_fix(const char *path, bool ignore_enoent) {
 void label_finish(void) {
 
 #ifdef HAVE_SELINUX
-        if (use_selinux() && label_hnd)
+        if (!use_selinux())
+                return;
+
+        if (label_hnd)
                 selabel_close(label_hnd);
 #endif
 }
@@ -177,7 +182,7 @@ fail:
         return r;
 }
 
-int label_fifofile_set(const char *path) {
+int label_context_set(const char *path, mode_t mode) {
         int r = 0;
 
 #ifdef HAVE_SELINUX
@@ -186,37 +191,8 @@ int label_fifofile_set(const char *path) {
         if (!use_selinux() || !label_hnd)
                 return 0;
 
-        r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO);
-        if (r < 0)
-                r = -errno;
-        else if (r == 0) {
-                r = setfscreatecon(filecon);
-                if (r < 0) {
-                        log_error("Failed to set SELinux file context on %s: %m", path);
-                        r = -errno;
-                }
-
-                freecon(filecon);
-        }
-
-        if (r < 0 && security_getenforce() == 0)
-                r = 0;
-#endif
-
-        return r;
-}
-
-int label_symlinkfile_set(const char *path) {
-        int r = 0;
-
-#ifdef HAVE_SELINUX
-        security_context_t filecon = NULL;
-
-        if (!use_selinux() || !label_hnd)
-                return 0;
-
-        r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK);
-        if (r < 0)
+        r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
+        if (r < 0 && errno != ENOENT)
                 r = -errno;
         else if (r == 0) {
                 r = setfscreatecon(filecon);
@@ -253,7 +229,7 @@ int label_socket_set(const char *label) {
         return 0;
 }
 
-void label_file_clear(void) {
+void label_context_clear(void) {
 
 #ifdef HAVE_SELINUX
         if (!use_selinux())
@@ -286,10 +262,9 @@ void label_free(const char *label) {
 int label_mkdir(const char *path, mode_t mode) {
 
         /* Creates a directory and labels it according to the SELinux policy */
-
 #ifdef HAVE_SELINUX
-        int r;
         security_context_t fcon = NULL;
+        int r;
 
         if (!use_selinux() || !label_hnd)
                 goto skipped;
@@ -297,14 +272,13 @@ int label_mkdir(const char *path, mode_t mode) {
         if (path_is_absolute(path))
                 r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
         else {
-                char *newpath;
+                _cleanup_free_ char *newpath;
 
                 newpath = path_make_absolute_cwd(path);
                 if (!newpath)
                         return -ENOMEM;
 
                 r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
-                free(newpath);
         }
 
         if (r == 0)
@@ -339,10 +313,10 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
         /* Binds a socket and label its file system object according to the SELinux policy */
 
 #ifdef HAVE_SELINUX
-        int r;
         security_context_t fcon = NULL;
         const struct sockaddr_un *un;
-        char *path = NULL;
+        char *path;
+        int r;
 
         assert(fd >= 0);
         assert(addr);
@@ -364,24 +338,18 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
         if (un->sun_path[0] == 0)
                 goto skipped;
 
-        path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
-        if (!path)
-                return -ENOMEM;
+        path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
 
         if (path_is_absolute(path))
                 r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
         else {
-                char *newpath;
+                _cleanup_free_ char *newpath;
 
                 newpath = path_make_absolute_cwd(path);
-
-                if (!newpath) {
-                        free(path);
+                if (!newpath)
                         return -ENOMEM;
-                }
 
                 r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
-                free(newpath);
         }
 
         if (r == 0)
@@ -403,7 +371,6 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
 finish:
         setfscreatecon(NULL);
         freecon(fcon);
-        free(path);
 
         return r;
 
@@ -411,3 +378,15 @@ skipped:
 #endif
         return bind(fd, addr, addrlen) < 0 ? -errno : 0;
 }
+
+int label_apply(const char *path, const char *label) {
+        int r = 0;
+
+#ifdef HAVE_SELINUX
+        if (!use_selinux())
+                return 0;
+
+        r = setfilecon(path, (char *)label);
+#endif
+        return r;
+}