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ima-setup: simplify

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2014-12-01 20:47:37 -05:00
parent 553acb7b6b
commit 4dfb18922d
1 changed files with 18 additions and 43 deletions
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61
src/core/ima-setup.c
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@@ -24,18 +24,14 @@
#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"
@@ -45,58 +41,37 @@ int ima_setup(void) {
int r = 0;
#ifdef HAVE_IMA
struct stat st;
ssize_t policy_size = 0;
char *policy;
_cleanup_close_ int policyfd = -1, imafd = -1;
if (stat(IMA_POLICY_PATH, &st) < 0)
return 0;
policy_size = st.st_size;
if (stat(IMA_SECFS_DIR, &st) < 0) {
if (access(IMA_SECFS_DIR, F_OK) < 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_errno(errno, "Failed to open the IMA custom policy file %s (%m), ignoring.",
IMA_POLICY_PATH);
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 %s (%m), ignoring.",
IMA_SECFS_POLICY);
goto out;
log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
return 0;
}
policy = mmap(NULL, policy_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
if (policy == MAP_FAILED) {
log_error_errno(errno, "mmap() failed (%m), freezing");
r = -errno;
goto out;
}
r = copy_bytes(policyfd, imafd, -1);
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".");
r = loop_write(imafd, policy, (size_t)policy_size, false);
if (r < 0) {
log_error_errno(r, "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:
#endif /* HAVE_IMA */
return r;
}