X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fselinux-setup.c;h=fdc316048add74cf1844f6d570219576286e0611;hp=f400f416da3872952f0495e5bf589f038921dcfb;hb=0b3325e79eb98f2e5bc19a1b0efd99e693b31a99;hpb=871e580949b1417058da7f7e9fa0380d308ef708

diff --git a/src/selinux-setup.c b/src/selinux-setup.c
index f400f416d..fdc316048 100644
--- a/src/selinux-setup.c
+++ b/src/selinux-setup.c
@@ -33,44 +33,70 @@
 #include "macro.h"
 #include "util.h"
 #include "log.h"
+#include "label.h"
+
+int selinux_setup(bool *loaded_policy) {
 
-int selinux_setup(char *const argv[]) {
 #ifdef HAVE_SELINUX
        int enforce = 0;
-       usec_t n;
+       usec_t before_load, after_load;
+       security_context_t con;
+       int r;
 
-       /* Already initialized? */
-       if (path_is_mount_point("/sys/fs/selinux") > 0 ||
-           path_is_mount_point("/selinux") > 0)
-               return 0;
+       assert(loaded_policy);
 
-       /* Before we load the policy we create a flag file to ensure
-        * that after the reexec we iterate through /run and /dev to
-        * relabel things. */
-       touch("/dev/.systemd-relabel-run-dev");
+       /* Already initialized by somebody else? */
+       r = getcon_raw(&con);
+       if (r == 0) {
+               bool initialized;
 
-       n = now(CLOCK_MONOTONIC);
-       if (selinux_init_load_policy(&enforce) == 0) {
-               char buf[FORMAT_TIMESPAN_MAX];
+               initialized = !streq(con, "kernel");
+               freecon(con);
 
-               n = now(CLOCK_MONOTONIC) - n;
-               log_info("Successfully loaded SELinux policy in %s, reexecuting.",
-                         format_timespan(buf, sizeof(buf), n));
+               if (initialized)
+                       return 0;
+       }
 
-               /* FIXME: Ideally we'd just call setcon() here instead
-                * of having to reexecute ourselves here. */
+       /* Make sure we have no fds open while loading the policy and
+        * transitioning */
+       log_close();
 
-               execv(SYSTEMD_BINARY_PATH, argv);
-               log_error("Failed to reexecute: %m");
-               return -errno;
+       /* Now load the policy */
+       before_load = now(CLOCK_MONOTONIC);
+       r = selinux_init_load_policy(&enforce);
 
-       } else {
-               log_full(enforce > 0 ? LOG_ERR : LOG_WARNING, "Failed to load SELinux policy.");
+       if (r == 0) {
+               char timespan[FORMAT_TIMESPAN_MAX];
+               char *label;
+
+               /* Transition to the new context */
+               r = label_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label);
+               if (r < 0) {
+                       log_open();
+                       log_error("Failed to compute init label, ignoring.");
+               } else {
+                       r = setcon(label);
+
+                       log_open();
+                       if (r < 0)
+                               log_error("Failed to transition into init label '%s', ignoring.", label);
 
-               unlink("/dev/.systemd-relabel-run-dev");
+                       label_free(label);
+               }
 
-               if (enforce > 0)
+               after_load = now(CLOCK_MONOTONIC);
+
+               log_info("Successfully loaded SELinux policy in %s.",
+                         format_timespan(timespan, sizeof(timespan), after_load - before_load));
+
+               *loaded_policy = true;
+
+       } else {
+               if (enforce > 0) {
+                       log_error("Failed to load SELinux policy.");
                        return -EIO;
+               } else
+                       log_debug("Unable to load SELinux policy.");
        }
 #endif