84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2012 Roberto Sassu - Politecnico di Torino, Italy
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TORSEC group — http://security.polito.it
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***/
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#include <errno.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fileio.h"
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#include "ima-setup.h"
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#include "log.h"
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#include "util.h"
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#define IMA_SECFS_DIR "/sys/kernel/security/ima"
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#define IMA_SECFS_POLICY IMA_SECFS_DIR "/policy"
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#define IMA_POLICY_PATH "/etc/ima/ima-policy"
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int ima_setup(void) {
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#if ENABLE_IMA
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_cleanup_fclose_ FILE *input = NULL;
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_cleanup_close_ int imafd = -1;
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unsigned lineno = 0;
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char line[page_size()];
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if (access(IMA_SECFS_DIR, F_OK) < 0) {
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log_debug("IMA support is disabled in the kernel, ignoring.");
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return 0;
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}
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if (access(IMA_SECFS_POLICY, W_OK) < 0) {
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log_warning("Another IMA custom policy has already been loaded, ignoring.");
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return 0;
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}
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if (access(IMA_POLICY_PATH, F_OK) < 0) {
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log_debug("No IMA custom policy file "IMA_POLICY_PATH", ignoring.");
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return 0;
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}
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imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
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if (imafd < 0) {
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log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
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return 0;
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}
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/* attempt to write the name of the policy file into sysfs file */
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if (write(imafd, IMA_POLICY_PATH, STRLEN(IMA_POLICY_PATH)) > 0)
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goto done;
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/* fall back to copying the policy line-by-line */
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input = fopen(IMA_POLICY_PATH, "re");
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if (!input) {
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log_warning_errno(errno, "Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m");
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return 0;
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}
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close(imafd);
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imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
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if (imafd < 0) {
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log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
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return 0;
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}
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FOREACH_LINE(line, input,
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return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) {
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size_t len;
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len = strlen(line);
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lineno++;
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if (len > 0 && write(imafd, line, len) < 0)
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return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m",
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lineno);
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}
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done:
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log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
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#endif /* ENABLE_IMA */
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return 0;
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}
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