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-rw-r--r--src/basic/audit-util.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/basic/audit-util.c b/src/basic/audit-util.c
new file mode 100644
index 0000000..5cbaef3
--- /dev/null
+++ b/src/basic/audit-util.c
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <linux/netlink.h>
+#include <stdio.h>
+#include <sys/socket.h>
+
+#include "alloc-util.h"
+#include "audit-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "user-util.h"
+
+int audit_session_from_pid(pid_t pid, uint32_t *id) {
+ _cleanup_free_ char *s = NULL;
+ const char *p;
+ uint32_t u;
+ int r;
+
+ assert(id);
+
+ /* We don't convert ENOENT to ESRCH here, since we can't
+ * really distuingish between "audit is not available in the
+ * kernel" and "the process does not exist", both which will
+ * result in ENOENT. */
+
+ p = procfs_file_alloca(pid, "sessionid");
+
+ r = read_one_line_file(p, &s);
+ if (r < 0)
+ return r;
+
+ r = safe_atou32(s, &u);
+ if (r < 0)
+ return r;
+
+ if (!audit_session_is_valid(u))
+ return -ENODATA;
+
+ *id = u;
+ return 0;
+}
+
+int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
+ _cleanup_free_ char *s = NULL;
+ const char *p;
+ uid_t u;
+ int r;
+
+ assert(uid);
+
+ p = procfs_file_alloca(pid, "loginuid");
+
+ r = read_one_line_file(p, &s);
+ if (r < 0)
+ return r;
+
+ r = parse_uid(s, &u);
+ if (r == -ENXIO) /* the UID was -1 */
+ return -ENODATA;
+ if (r < 0)
+ return r;
+
+ *uid = u;
+ return 0;
+}
+
+bool use_audit(void) {
+ static int cached_use = -1;
+
+ if (cached_use < 0) {
+ int fd;
+
+ fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
+ if (fd < 0) {
+ cached_use = !IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT, EPERM);
+ if (!cached_use)
+ log_debug_errno(errno, "Won't talk to audit: %m");
+ } else {
+ cached_use = true;
+ safe_close(fd);
+ }
+ }
+
+ return cached_use;
+}