#include <unistd.h>
#include <stdio.h>
#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <fcntl.h>
+#include <sys/types.h>
#include <sys/stat.h>
-#include <sys/mman.h>
+#include <fcntl.h>
#include "ima-setup.h"
-#include "mount-setup.h"
-#include "macro.h"
+#include "copy.h"
#include "util.h"
#include "log.h"
-#include "label.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) {
+ int r = 0;
#ifdef HAVE_IMA
- struct stat st;
- ssize_t policy_size = 0, written = 0;
- char *policy;
- _cleanup_close_ int policyfd = -1, imafd = -1;
- int result = 0;
-
- if (stat(IMA_POLICY_PATH, &st) < 0)
- return 0;
-
- policy_size = st.st_size;
- if (stat(IMA_SECFS_DIR, &st) < 0) {
- log_debug("IMA support is disabled in the kernel, ignoring.");
- return 0;
- }
-
- if (stat(IMA_SECFS_POLICY, &st) < 0) {
- log_error("Another IMA custom policy has already been loaded, "
- "ignoring.");
- return 0;
- }
-
- policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
- if (policyfd < 0) {
- log_error("Failed to open the IMA custom policy file %s (%m), "
- "ignoring.", IMA_POLICY_PATH);
- return 0;
- }
-
- imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
- if (imafd < 0) {
- log_error("Failed to open the IMA kernel interface %s (%m), "
- "ignoring.", IMA_SECFS_POLICY);
- goto out;
- }
-
- policy = mmap(NULL, policy_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
- if (policy == MAP_FAILED) {
- log_error("mmap() failed (%m), freezing");
- result = -errno;
- goto out;
- }
-
- written = loop_write(imafd, policy, (size_t)policy_size, false);
- if (written != policy_size) {
- log_error("Failed to load the IMA custom policy file %s (%m), "
- "ignoring.", IMA_POLICY_PATH);
- goto out_mmap;
- }
-
- log_info("Successfully loaded the IMA custom policy %s.",
- IMA_POLICY_PATH);
-out_mmap:
- munmap(policy, policy_size);
-out:
- if (result)
- return result;
-#endif /* HAVE_IMA */
+ _cleanup_close_ int policyfd = -1, imafd = -1;
+
+ if (access(IMA_SECFS_DIR, F_OK) < 0) {
+ log_debug("IMA support is disabled in the kernel, ignoring.");
+ return 0;
+ }
+
+ policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
+ if (policyfd < 0) {
+ 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;
+ }
+
+ r = copy_bytes(policyfd, imafd, (off_t) -1, false);
+ if (r < 0)
+ log_error_errno(r, "Failed to load the IMA custom policy file "IMA_POLICY_PATH": %m");
+ else
+ log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
- return 0;
+#endif /* HAVE_IMA */
+ return r;
}