diff options
Diffstat (limited to '')
| -rw-r--r-- | plugins/sudoers/match_command.c | 903 |
1 files changed, 903 insertions, 0 deletions
diff --git a/plugins/sudoers/match_command.c b/plugins/sudoers/match_command.c new file mode 100644 index 0000000..884e3d1 --- /dev/null +++ b/plugins/sudoers/match_command.c @@ -0,0 +1,903 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1996, 1998-2005, 2007-2022 + * Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Sponsored in part by the Defense Advanced Research Projects + * Agency (DARPA) and Air Force Research Laboratory, Air Force + * Materiel Command, USAF, under agreement number F39502-99-1-0512. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <sys/stat.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#ifndef SUDOERS_NAME_MATCH +# ifdef HAVE_GLOB +# include <glob.h> +# else +# include "compat/glob.h" +# endif /* HAVE_GLOB */ +#endif /* SUDOERS_NAME_MATCH */ +#include <dirent.h> +#include <fcntl.h> +#include <errno.h> +#ifdef HAVE_FNMATCH +# include <fnmatch.h> +#else +# include "compat/fnmatch.h" +#endif /* HAVE_FNMATCH */ +#include <regex.h> + +#include "sudoers.h" +#include <gram.h> + +#if !defined(O_EXEC) && defined(O_PATH) +# define O_EXEC O_PATH +#endif + +static bool +regex_matches(const char *pattern, const char *str) +{ + const char *errstr; + int errcode; + regex_t re; + debug_decl(regex_matches, SUDOERS_DEBUG_MATCH); + + if (!sudo_regex_compile(&re, pattern, &errstr)) { + sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, + "unable to compile regular expression \"%s\": %s", + pattern, errstr); + debug_return_bool(false); + } + + errcode = regexec(&re, str, 0, NULL, 0); + regfree(&re); + + debug_return_bool(errcode == 0); +} + +static bool +command_args_match(const char *sudoers_cmnd, const char *sudoers_args) +{ + const char *args = user_args ? user_args : ""; + int flags = 0; + debug_decl(command_args_match, SUDOERS_DEBUG_MATCH); + + /* + * If no args specified in sudoers, any user args are allowed. + * If the empty string is specified in sudoers, no user args are allowed. + */ + if (sudoers_args == NULL) + debug_return_bool(true); + if (strcmp("\"\"", sudoers_args) == 0) + debug_return_bool(user_args ? false : true); + + /* + * If args are specified in sudoers, they must match the user args. + * Args are matched either as a regular expression or glob pattern. + */ + if (sudoers_args[0] == '^') { + size_t len = strlen(sudoers_args); + if (len > 0 && sudoers_args[len - 1] == '$') + debug_return_bool(regex_matches(sudoers_args, args)); + } + + /* If running as sudoedit, all args are assumed to be paths. */ + if (strcmp(sudoers_cmnd, "sudoedit") == 0) + flags = FNM_PATHNAME; + debug_return_bool(fnmatch(sudoers_args, args, flags) == 0); +} + +#ifndef SUDOERS_NAME_MATCH +/* + * Stat file by fd is possible, else by path. + * Returns true on success, else false. + */ +static bool +do_stat(int fd, const char *path, const char *runchroot, struct stat *sb) +{ + char pathbuf[PATH_MAX]; + bool ret; + debug_decl(do_stat, SUDOERS_DEBUG_MATCH); + + if (fd != -1) { + ret = fstat(fd, sb) == 0; + } else { + /* Make path relative to the new root, if any. */ + if (runchroot != NULL) { + const int len = + snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, path); + if (len >= ssizeof(pathbuf)) { + errno = ENAMETOOLONG; + debug_return_bool(false); + } + path = pathbuf; + } + ret = stat(path, sb) == 0; + } + debug_return_bool(ret); +} + +/* + * Perform intercept-specific checks. + * Returns true if allowed, else false. + */ +static bool +intercept_ok(const char *path, bool intercepted, struct stat *sb) +{ + debug_decl(intercept_ok, SUDOERS_DEBUG_MATCH); + + if (intercepted) { + if (!def_intercept_allow_setid && ISSET(sb->st_mode, S_ISUID|S_ISGID)) { + sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO, + "rejecting setid command %s", path); + debug_return_bool(false); + } + } + debug_return_bool(true); +} +#endif /* SUDOERS_NAME_MATCH */ + +/* + * Check whether the fd refers to a shell script with a "#!" shebang. + */ +static bool +is_script(int fd) +{ + bool ret = false; + char magic[2]; + debug_decl(is_script, SUDOERS_DEBUG_MATCH); + + if (pread(fd, magic, 2, 0) == 2) { + if (magic[0] == '#' && magic[1] == '!') + ret = true; + } + debug_return_int(ret); +} + +/* + * Open path if fdexec is enabled or if a digest is present. + * Returns false on error, else true. + */ +static bool +open_cmnd(const char *path, const char *runchroot, + const struct command_digest_list *digests, int *fdp) +{ + int fd; + char pathbuf[PATH_MAX]; + debug_decl(open_cmnd, SUDOERS_DEBUG_MATCH); + + /* Only open the file for fdexec or for digest matching. */ + if (def_fdexec != always && TAILQ_EMPTY(digests)) + debug_return_bool(true); + + /* Make path relative to the new root, if any. */ + if (runchroot != NULL) { + const int len = + snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, path); + if (len >= ssizeof(pathbuf)) { + errno = ENAMETOOLONG; + debug_return_bool(false); + } + path = pathbuf; + } + + fd = open(path, O_RDONLY|O_NONBLOCK); +# ifdef O_EXEC + if (fd == -1 && errno == EACCES && TAILQ_EMPTY(digests)) { + /* Try again with O_EXEC if no digest is specified. */ + const int saved_errno = errno; + if ((fd = open(path, O_EXEC)) == -1) + errno = saved_errno; + } +# endif + if (fd == -1) + debug_return_bool(false); + + (void)fcntl(fd, F_SETFD, FD_CLOEXEC); + *fdp = fd; + debug_return_bool(true); +} + +static void +set_cmnd_fd(int fd) +{ + debug_decl(set_cmnd_fd, SUDOERS_DEBUG_MATCH); + + if (cmnd_fd != -1) + close(cmnd_fd); + + if (fd != -1) { + if (def_fdexec == never) { + /* Never use fexedcve() */ + close(fd); + fd = -1; + } else if (is_script(fd)) { + char fdpath[PATH_MAX]; + struct stat sb; + int flags; + + /* We can only use fexecve() on a script if /dev/fd/N exists. */ + (void)snprintf(fdpath, sizeof(fdpath), "/dev/fd/%d", fd); + if (stat(fdpath, &sb) != 0) { + /* Missing /dev/fd file, can't use fexecve(). */ + close(fd); + fd = -1; + } else { + /* + * Shell scripts go through namei twice so we can't have the + * close on exec flag set on the fd for fexecve(2). + */ + flags = fcntl(fd, F_GETFD) & ~FD_CLOEXEC; + (void)fcntl(fd, F_SETFD, flags); + } + } + } + + cmnd_fd = fd; + + debug_return; +} + +#ifndef SUDOERS_NAME_MATCH +/* + * Return true if user_cmnd names one of the inodes in dir, else false. + */ +static bool +command_matches_dir(const char *sudoers_dir, size_t dlen, const char *runchroot, + bool intercepted, const struct command_digest_list *digests) +{ + char buf[PATH_MAX], sdbuf[PATH_MAX]; + struct stat sudoers_stat; + struct dirent *dent; + size_t chrootlen = 0; + int fd = -1; + DIR *dirp; + debug_decl(command_matches_dir, SUDOERS_DEBUG_MATCH); + + /* Make sudoers_dir relative to the new root, if any. */ + if (runchroot != NULL) { + const int len = + snprintf(sdbuf, sizeof(sdbuf), "%s%s", runchroot, sudoers_dir); + if (len >= ssizeof(sdbuf)) { + errno = ENAMETOOLONG; + debug_return_bool(false); + } + sudoers_dir = sdbuf; + chrootlen = strlen(runchroot); + } + + /* + * Grot through directory entries, looking for user_base. + */ + dirp = opendir(sudoers_dir); + if (dirp == NULL) + debug_return_bool(false); + + if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) { + closedir(dirp); + debug_return_bool(false); + } + while ((dent = readdir(dirp)) != NULL) { + if (fd != -1) { + close(fd); + fd = -1; + } + + /* ignore paths > PATH_MAX (XXX - log) */ + buf[dlen] = '\0'; + if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf)) + continue; + + /* only stat if basenames are the same */ + if (strcmp(user_base, dent->d_name) != 0) + continue; + + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(buf, NULL, digests, &fd)) + continue; + if (!do_stat(fd, buf, NULL, &sudoers_stat)) + continue; + if (!intercept_ok(buf, intercepted, &sudoers_stat)) + continue; + + if (user_stat == NULL || + (user_stat->st_dev == sudoers_stat.st_dev && + user_stat->st_ino == sudoers_stat.st_ino)) { + /* buf is already relative to runchroot */ + if (!digest_matches(fd, buf, NULL, digests)) + continue; + free(safe_cmnd); + if ((safe_cmnd = strdup(buf + chrootlen)) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, + U_("unable to allocate memory")); + dent = NULL; + } + break; + } + } + closedir(dirp); + + if (dent != NULL) { + set_cmnd_fd(fd); + debug_return_bool(true); + } + if (fd != -1) + close(fd); + debug_return_bool(false); +} +#else /* SUDOERS_NAME_MATCH */ +/* + * Return true if user_cmnd names one of the inodes in dir, else false. + */ +static bool +command_matches_dir(const char *sudoers_dir, size_t dlen, const char *runchroot, + bool intercepted, const struct command_digest_list *digests) +{ + int fd = -1; + debug_decl(command_matches_dir, SUDOERS_DEBUG_MATCH); + + /* Match user_cmnd against sudoers_dir. */ + if (strncmp(user_cmnd, sudoers_dir, dlen) != 0 || user_cmnd[dlen] != '/') + goto bad; + + /* Make sure user_cmnd is not in a subdir of sudoers_dir. */ + if (strchr(user_cmnd + dlen + 1, '\0') != NULL) + goto bad; + + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(user_cmnd, runchroot, digests, &fd)) + goto bad; + if (!digest_matches(fd, user_cmnd, runchroot, digests)) + goto bad; + set_cmnd_fd(fd); + + debug_return_bool(true); +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); +} +#endif /* SUDOERS_NAME_MATCH */ + +static bool +command_matches_all(const char *runchroot, + bool intercepted, const struct command_digest_list *digests) +{ +#ifndef SUDOERS_NAME_MATCH + struct stat sb; +#endif + int fd = -1; + debug_decl(command_matches_all, SUDOERS_DEBUG_MATCH); + + if (user_cmnd[0] == '/') { +#ifndef SUDOERS_NAME_MATCH + /* Open the file for fdexec or for digest matching. */ + bool open_error = !open_cmnd(user_cmnd, runchroot, digests, &fd); + + /* A non-existent file is not an error for "sudo ALL". */ + if (do_stat(fd, user_cmnd, runchroot, &sb)) { + if (open_error) { + /* File exists but we couldn't open it above? */ + goto bad; + } + if (!intercept_ok(user_cmnd, intercepted, &sb)) + goto bad; + } +#else + /* Open the file for fdexec or for digest matching. */ + (void)open_cmnd(user_cmnd, runchroot, digests, &fd); +#endif + } + + /* Check digest of user_cmnd since we have no sudoers_cmnd for ALL. */ + if (!digest_matches(fd, user_cmnd, runchroot, digests)) + goto bad; + set_cmnd_fd(fd); + + /* No need to set safe_cmnd for ALL. */ + debug_return_bool(true); +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); +} + +static bool +command_matches_fnmatch(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ +#ifndef SUDOERS_NAME_MATCH + struct stat sb; +#endif + int fd = -1; + debug_decl(command_matches_fnmatch, SUDOERS_DEBUG_MATCH); + + /* + * Return true if fnmatch(3) succeeds AND + * a) there are no args in sudoers OR + * b) there are no args on command line and none required by sudoers OR + * c) there are args in sudoers and on command line and they match + * else return false. + * + * Neither sudoers_cmnd nor user_cmnd are relative to runchroot. + */ + if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0) + debug_return_bool(false); + if (command_args_match(sudoers_cmnd, sudoers_args)) { + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(user_cmnd, runchroot, digests, &fd)) + goto bad; +#ifndef SUDOERS_NAME_MATCH + if (!do_stat(fd, user_cmnd, runchroot, &sb)) + goto bad; + if (!intercept_ok(user_cmnd, intercepted, &sb)) + goto bad; +#endif + /* Check digest of user_cmnd since sudoers_cmnd is a pattern. */ + if (!digest_matches(fd, user_cmnd, runchroot, digests)) + goto bad; + set_cmnd_fd(fd); + + /* No need to set safe_cmnd since user_cmnd matches sudoers_cmnd */ + debug_return_bool(true); +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); + } + debug_return_bool(false); +} + +static bool +command_matches_regex(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ +#ifndef SUDOERS_NAME_MATCH + struct stat sb; +#endif + int fd = -1; + debug_decl(command_matches_regex, SUDOERS_DEBUG_MATCH); + + /* + * Return true if sudoers_cmnd regex matches user_cmnd AND + * a) there are no args in sudoers OR + * b) there are no args on command line and none required by sudoers OR + * c) there are args in sudoers and on command line and they match + * else return false. + * + * Neither sudoers_cmnd nor user_cmnd are relative to runchroot. + */ + if (!regex_matches(sudoers_cmnd, user_cmnd)) + debug_return_bool(false); + + if (command_args_match(sudoers_cmnd, sudoers_args)) { + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(user_cmnd, runchroot, digests, &fd)) + goto bad; +#ifndef SUDOERS_NAME_MATCH + if (!do_stat(fd, user_cmnd, runchroot, &sb)) + goto bad; + if (!intercept_ok(user_cmnd, intercepted, &sb)) + goto bad; +#endif + /* Check digest of user_cmnd since sudoers_cmnd is a pattern. */ + if (!digest_matches(fd, user_cmnd, runchroot, digests)) + goto bad; + set_cmnd_fd(fd); + + /* No need to set safe_cmnd since user_cmnd matches sudoers_cmnd */ + debug_return_bool(true); +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); + } + debug_return_bool(false); +} + +#ifndef SUDOERS_NAME_MATCH +static bool +command_matches_glob(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ + struct stat sudoers_stat; + bool bad_digest = false; + char **ap, *base, *cp; + char pathbuf[PATH_MAX]; + int fd = -1; + size_t dlen, chrootlen = 0; + glob_t gl; + debug_decl(command_matches_glob, SUDOERS_DEBUG_MATCH); + + /* + * First check to see if we can avoid the call to glob(3). + * Short circuit if there are no meta chars in the command itself + * and user_base and basename(sudoers_cmnd) don't match. + */ + dlen = strlen(sudoers_cmnd); + if (sudoers_cmnd[dlen - 1] != '/') { + base = sudo_basename(sudoers_cmnd); + if (!has_meta(base) && strcmp(user_base, base) != 0) + debug_return_bool(false); + } + + /* Make sudoers_cmnd relative to the new root, if any. */ + if (runchroot != NULL) { + const int len = + snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, sudoers_cmnd); + if (len >= ssizeof(pathbuf)) { + errno = ENAMETOOLONG; + debug_return_bool(false); + } + sudoers_cmnd = pathbuf; + chrootlen = strlen(runchroot); + } + + /* + * Return true if we find a match in the glob(3) results AND + * a) there are no args in sudoers OR + * b) there are no args on command line and none required by sudoers OR + * c) there are args in sudoers and on command line and they match + * else return false. + */ + if (glob(sudoers_cmnd, GLOB_NOSORT, NULL, &gl) != 0 || gl.gl_pathc == 0) { + globfree(&gl); + debug_return_bool(false); + } + /* If user_cmnd is fully-qualified, check for an exact match. */ + if (user_cmnd[0] == '/') { + for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) { + if (fd != -1) { + close(fd); + fd = -1; + } + /* Remove the runchroot, if any. */ + cp += chrootlen; + + if (strcmp(cp, user_cmnd) != 0) + continue; + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(cp, runchroot, digests, &fd)) + continue; + if (!do_stat(fd, cp, runchroot, &sudoers_stat)) + continue; + if (!intercept_ok(cp, intercepted, &sudoers_stat)) + continue; + if (user_stat == NULL || + (user_stat->st_dev == sudoers_stat.st_dev && + user_stat->st_ino == sudoers_stat.st_ino)) { + /* There could be multiple matches, check digest early. */ + if (!digest_matches(fd, cp, runchroot, digests)) { + bad_digest = true; + continue; + } + free(safe_cmnd); + if ((safe_cmnd = strdup(cp)) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, + U_("unable to allocate memory")); + cp = NULL; /* fail closed */ + } + } else { + /* Paths match, but st_dev and st_ino are different. */ + cp = NULL; /* fail closed */ + } + goto done; + } + } + /* No exact match, compare basename, st_dev and st_ino. */ + if (!bad_digest) { + for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) { + if (fd != -1) { + close(fd); + fd = -1; + } + + /* Remove the runchroot, if any. */ + cp += chrootlen; + + /* If it ends in '/' it is a directory spec. */ + dlen = strlen(cp); + if (cp[dlen - 1] == '/') { + if (command_matches_dir(cp, dlen, runchroot, intercepted, digests)) { + globfree(&gl); + debug_return_bool(true); + } + continue; + } + + /* Only proceed if user_base and basename(cp) match */ + base = sudo_basename(cp); + if (strcmp(user_base, base) != 0) + continue; + + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(cp, runchroot, digests, &fd)) + continue; + if (!do_stat(fd, cp, runchroot, &sudoers_stat)) + continue; + if (!intercept_ok(cp, intercepted, &sudoers_stat)) + continue; + if (user_stat == NULL || + (user_stat->st_dev == sudoers_stat.st_dev && + user_stat->st_ino == sudoers_stat.st_ino)) { + if (!digest_matches(fd, cp, runchroot, digests)) + continue; + free(safe_cmnd); + if ((safe_cmnd = strdup(cp)) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, + U_("unable to allocate memory")); + cp = NULL; /* fail closed */ + } + goto done; + } + } + } +done: + globfree(&gl); + if (cp != NULL) { + if (command_args_match(sudoers_cmnd, sudoers_args)) { + /* safe_cmnd was set above. */ + set_cmnd_fd(fd); + debug_return_bool(true); + } + } + if (fd != -1) + close(fd); + debug_return_bool(false); +} + +static bool +command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ + struct stat sudoers_stat; + const char *base; + size_t dlen; + int fd = -1; + debug_decl(command_matches_normal, SUDOERS_DEBUG_MATCH); + + /* If it ends in '/' it is a directory spec. */ + dlen = strlen(sudoers_cmnd); + if (sudoers_cmnd[dlen - 1] == '/') { + debug_return_bool(command_matches_dir(sudoers_cmnd, dlen, runchroot, + intercepted, digests)); + } + + /* Only proceed if user_base and basename(sudoers_cmnd) match */ + base = sudo_basename(sudoers_cmnd); + if (strcmp(user_base, base) != 0) + debug_return_bool(false); + + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(sudoers_cmnd, runchroot, digests, &fd)) + goto bad; + + /* + * Return true if command matches AND + * a) there are no args in sudoers OR + * b) there are no args on command line and none req by sudoers OR + * c) there are args in sudoers and on command line and they match + * d) there is a digest and it matches + */ + if (user_stat != NULL && do_stat(fd, sudoers_cmnd, runchroot, &sudoers_stat)) { + if (!intercept_ok(sudoers_cmnd, intercepted, &sudoers_stat)) + goto bad; + if (user_stat->st_dev != sudoers_stat.st_dev || + user_stat->st_ino != sudoers_stat.st_ino) + goto bad; + } else { + /* Either user or sudoers command does not exist, match by name. */ + if (strcmp(user_cmnd, sudoers_cmnd) != 0) + goto bad; + } + if (!command_args_match(sudoers_cmnd, sudoers_args)) + goto bad; + if (!digest_matches(fd, sudoers_cmnd, runchroot, digests)) { + /* XXX - log functions not available but we should log very loudly */ + goto bad; + } + free(safe_cmnd); + if ((safe_cmnd = strdup(sudoers_cmnd)) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + goto bad; + } + set_cmnd_fd(fd); + debug_return_bool(true); +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); +} +#else /* SUDOERS_NAME_MATCH */ +static bool +command_matches_glob(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ + return command_matches_fnmatch(sudoers_cmnd, sudoers_args, runchroot, + intercepted, digests); +} + +static bool +command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, bool intercepted, + const struct command_digest_list *digests) +{ + size_t dlen; + int fd = -1; + debug_decl(command_matches_normal, SUDOERS_DEBUG_MATCH); + + /* If it ends in '/' it is a directory spec. */ + dlen = strlen(sudoers_cmnd); + if (sudoers_cmnd[dlen - 1] == '/') { + debug_return_bool(command_matches_dir(sudoers_cmnd, dlen, runchroot, + intercepted, digests)); + } + + if (strcmp(user_cmnd, sudoers_cmnd) == 0) { + if (command_args_match(sudoers_cmnd, sudoers_args)) { + /* Open the file for fdexec or for digest matching. */ + if (!open_cmnd(user_cmnd, runchroot, digests, &fd)) + goto bad; + if (!digest_matches(fd, user_cmnd, runchroot, digests)) + goto bad; + + /* Successful match. */ + free(safe_cmnd); + if ((safe_cmnd = strdup(sudoers_cmnd)) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, + U_("unable to allocate memory")); + goto bad; + } + set_cmnd_fd(fd); + debug_return_bool(true); + } + } +bad: + if (fd != -1) + close(fd); + debug_return_bool(false); +} +#endif /* SUDOERS_NAME_MATCH */ + +/* + * If path doesn't end in /, return true iff cmnd & path name the same inode; + * otherwise, return true if user_cmnd names one of the inodes in path. + */ +bool +command_matches(const char *sudoers_cmnd, const char *sudoers_args, + const char *runchroot, struct cmnd_info *info, + const struct command_digest_list *digests) +{ + const bool intercepted = info ? info->intercepted : false; + char *saved_user_cmnd = NULL; + struct stat saved_user_stat; + bool rc = false; + debug_decl(command_matches, SUDOERS_DEBUG_MATCH); + + if (user_runchroot != NULL) { + if (runchroot != NULL && strcmp(runchroot, "*") != 0 && + strcmp(runchroot, user_runchroot) != 0) { + /* CHROOT mismatch */ + goto done; + } + /* User-specified runchroot (user_stat already set appropriately). */ + runchroot = user_runchroot; + } else if (runchroot == NULL) { + /* No rule-specific runchroot, use global (user_stat already set). */ + if (def_runchroot != NULL && strcmp(def_runchroot, "*") != '\0') + runchroot = def_runchroot; + } else { + /* Rule-specific runchroot, reset user_cmnd and user_stat. */ + int status; + + /* Save old user_cmnd first, set_cmnd_path() will free it. */ + saved_user_cmnd = user_cmnd; + user_cmnd = NULL; + if (user_stat != NULL) + saved_user_stat = *user_stat; + status = set_cmnd_path(runchroot); + if (status != FOUND) { + user_cmnd = saved_user_cmnd; + saved_user_cmnd = NULL; + } + if (info != NULL) + info->status = status; + } + + if (sudoers_cmnd == NULL) { + sudoers_cmnd = "ALL"; + rc = command_matches_all(runchroot, intercepted, digests); + goto done; + } + + /* Check for regular expressions first. */ + if (sudoers_cmnd[0] == '^') { + rc = command_matches_regex(sudoers_cmnd, sudoers_args, runchroot, + intercepted, digests); + goto done; + } + + /* Check for pseudo-commands */ + if (sudoers_cmnd[0] != '/') { + /* + * Return true if sudoers_cmnd and user_cmnd match a pseudo-command AND + * a) there are no args in sudoers OR + * b) there are no args on command line and none req by sudoers OR + * c) there are args in sudoers and on command line and they match + */ + if (strcmp(sudoers_cmnd, "list") == 0 || + strcmp(sudoers_cmnd, "sudoedit") == 0) { + if (strcmp(user_cmnd, sudoers_cmnd) == 0 && + command_args_match(sudoers_cmnd, sudoers_args)) { + /* No need to set safe_cmnd since user_cmnd == sudoers_cmnd */ + rc = true; + } + } + goto done; + } + + if (has_meta(sudoers_cmnd)) { + /* + * If sudoers_cmnd has meta characters in it, we need to + * use glob(3) and/or fnmatch(3) to do the matching. + */ + if (def_fast_glob) { + rc = command_matches_fnmatch(sudoers_cmnd, sudoers_args, runchroot, + intercepted, digests); + } else { + rc = command_matches_glob(sudoers_cmnd, sudoers_args, runchroot, + intercepted, digests); + } + } else { + rc = command_matches_normal(sudoers_cmnd, sudoers_args, runchroot, + intercepted, digests); + } +done: + if (saved_user_cmnd != NULL) { + if (info != NULL) { + info->cmnd_path = user_cmnd; + if (user_stat != NULL) + info->cmnd_stat = *user_stat; + } else { + free(user_cmnd); + } + user_cmnd = saved_user_cmnd; + if (user_stat != NULL) + *user_stat = saved_user_stat; + } + sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO, + "user command \"%s%s%s\" matches sudoers command \"%s%s%s\"%s%s: %s", + user_cmnd, user_args ? " " : "", user_args ? user_args : "", + sudoers_cmnd, sudoers_args ? " " : "", sudoers_args ? sudoers_args : "", + runchroot ? ", chroot " : "", runchroot ? runchroot : "", + rc ? "true" : "false"); + debug_return_bool(rc); +} |