1 files changed, 80 insertions, 0 deletions
diff --git a/src/grp-system/libcore/src/ima-setup.c b/src/grp-system/libcore/src/ima-setup.c
new file mode 100644
index 0000000000..d1ec4852c9
--- /dev/null
+++ b/src/grp-system/libcore/src/ima-setup.c
@@ -0,0 +1,80 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+  Copyright (C) 2012 Roberto Sassu - Politecnico di Torino, Italy
+                                     TORSEC group — http://security.polito.it
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "core/ima-setup.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/util.h"
+
+#define IMA_SECFS_DIR "/sys/kernel/security/ima"
+#define IMA_SECFS_POLICY IMA_SECFS_DIR "/policy"
+#define IMA_POLICY_PATH "/etc/ima/ima-policy"
+
+int ima_setup(void) {
+#ifdef HAVE_IMA
+        _cleanup_fclose_ FILE *input = NULL;
+        _cleanup_close_ int imafd = -1;
+        unsigned lineno = 0;
+        char line[page_size()];
+
+        if (access(IMA_SECFS_DIR, F_OK) < 0) {
+                log_debug("IMA support is disabled in the kernel, ignoring.");
+                return 0;
+        }
+
+        input = fopen(IMA_POLICY_PATH, "re");
+        if (!input) {
+                log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
+                               "Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m");
+                return 0;
+        }
+
+        if (access(IMA_SECFS_POLICY, F_OK) < 0) {
+                log_warning("Another IMA custom policy has already been loaded, ignoring.");
+                return 0;
+        }
+
+        imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
+        if (imafd < 0) {
+                log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
+                return 0;
+        }
+
+        FOREACH_LINE(line, input,
+                     return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) {
+                size_t len;
+
+                len = strlen(line);
+                lineno++;
+
+                if (len > 0 && write(imafd, line, len) < 0)
+                        return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m",
+                                               lineno);
+        }
+
+        log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
+#endif /* HAVE_IMA */
+        return 0;
+}