/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright (C) 2013 Intel Corporation Authors: Nathaniel Chen <nathaniel.chen@intel.com> 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 <stdio.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <stdlib.h> #include <sys/vfs.h> #include <fcntl.h> #include <sys/types.h> #include <dirent.h> #include <sys/mount.h> #include <stdint.h> #include "macro.h" #include "smack-setup.h" #include "util.h" #include "fileio.h" #include "log.h" #include "label.h" #define SMACK_CONFIG "/etc/smack/accesses.d/" #define CIPSO_CONFIG "/etc/smack/cipso.d/" #ifdef HAVE_SMACK static int write_rules(const char* dstpath, const char* srcdir) { _cleanup_fclose_ FILE *dst = NULL; _cleanup_closedir_ DIR *dir = NULL; struct dirent *entry; char buf[NAME_MAX]; int dfd = -1; int r = 0; dst = fopen(dstpath, "we"); if (!dst) { if (errno != ENOENT) log_warning("Failed to open %s: %m", dstpath); return -errno; /* negative error */ } /* write rules to dst from every file in the directory */ dir = opendir(srcdir); if (!dir) { if (errno != ENOENT) log_warning("Failed to opendir %s: %m", srcdir); return errno; /* positive on purpose */ } dfd = dirfd(dir); assert(dfd >= 0); FOREACH_DIRENT(entry, dir, return 0) { int fd; _cleanup_fclose_ FILE *policy = NULL; fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC); if (fd < 0) { if (r == 0) r = -errno; log_warning("Failed to open %s: %m", entry->d_name); continue; } policy = fdopen(fd, "re"); if (!policy) { if (r == 0) r = -errno; safe_close(fd); log_error("Failed to open %s: %m", entry->d_name); continue; } /* load2 write rules in the kernel require a line buffered stream */ FOREACH_LINE(buf, policy, log_error("Failed to read line from %s: %m", entry->d_name)) { if (!fputs(buf, dst)) { if (r == 0) r = -EINVAL; log_error("Failed to write line to %s", dstpath); break; } if (fflush(dst)) { if (r == 0) r = -errno; log_error("Failed to flush writes to %s: %m", dstpath); break; } } } return r; } #endif int smack_setup(bool *loaded_policy) { #ifdef HAVE_SMACK int r; assert(loaded_policy); r = write_rules("/sys/fs/smackfs/load2", SMACK_CONFIG); switch(r) { case -ENOENT: log_debug("Smack is not enabled in the kernel."); return 0; case ENOENT: log_debug("Smack access rules directory " SMACK_CONFIG " not found"); return 0; case 0: log_info("Successfully loaded Smack policies."); break; default: log_warning("Failed to load Smack access rules: %s, ignoring.", strerror(abs(r))); return 0; } #ifdef SMACK_RUN_LABEL r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL); if (r) log_warning("Failed to set SMACK label \"%s\" on self: %s", SMACK_RUN_LABEL, strerror(-r)); #endif r = write_rules("/sys/fs/smackfs/cipso2", CIPSO_CONFIG); switch(r) { case -ENOENT: log_debug("Smack/CIPSO is not enabled in the kernel."); return 0; case ENOENT: log_debug("Smack/CIPSO access rules directory " CIPSO_CONFIG " not found"); return 0; case 0: log_info("Successfully loaded Smack/CIPSO policies."); return 0; default: log_warning("Failed to load Smack/CIPSO access rules: %s, ignoring.", strerror(abs(r))); return 0; } *loaded_policy = true; #endif return 0; }