/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 <unistd.h> #include <errno.h> #include "ima-setup.h" #include "util.h" #include "log.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; }