a514a6eed5
privs. Previously, only root or a user with the ability to run any command as either root or the target user on the current host could use the -U option. For "sudo -l [-U otheruser] command", NewArgv[0] is now set to "list" (just like "sudo -l") and the actual command to be checked starts with NewArgv[1].
900 lines
25 KiB
C
900 lines
25 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 1996, 1998-2005, 2007-2022
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* Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef SUDOERS_NAME_MATCH
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# ifdef HAVE_GLOB
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# include <glob.h>
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# else
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# include "compat/glob.h"
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# endif /* HAVE_GLOB */
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#endif /* SUDOERS_NAME_MATCH */
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#include <dirent.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifdef HAVE_FNMATCH
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# include <fnmatch.h>
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#else
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# include "compat/fnmatch.h"
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#endif /* HAVE_FNMATCH */
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#include <regex.h>
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#include "sudoers.h"
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#include <gram.h>
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#if !defined(O_EXEC) && defined(O_PATH)
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# define O_EXEC O_PATH
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#endif
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static bool
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regex_matches(const char *pattern, const char *str)
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{
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const char *errstr;
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int errcode;
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regex_t re;
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debug_decl(regex_matches, SUDOERS_DEBUG_MATCH);
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if (!sudo_regex_compile(&re, pattern, &errstr)) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
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"unable to compile regular expression \"%s\": %s",
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pattern, errstr);
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debug_return_bool(false);
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}
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errcode = regexec(&re, str, 0, NULL, 0);
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regfree(&re);
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debug_return_bool(errcode == 0);
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}
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static bool
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command_args_match(const char *sudoers_cmnd, const char *sudoers_args)
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{
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const char *args = user_args ? user_args : "";
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int flags = 0;
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debug_decl(command_args_match, SUDOERS_DEBUG_MATCH);
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/*
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* If no args specified in sudoers, any user args are allowed.
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* If the empty string is specified in sudoers, no user args are allowed.
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*/
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if (sudoers_args == NULL)
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debug_return_bool(true);
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if (strcmp("\"\"", sudoers_args) == 0)
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debug_return_bool(user_args ? false : true);
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/*
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* If args are specified in sudoers, they must match the user args.
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* Args are matched either as a regular expression or glob pattern.
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*/
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if (sudoers_args[0] == '^') {
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size_t len = strlen(sudoers_args);
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if (len > 0 && sudoers_args[len - 1] == '$')
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debug_return_bool(regex_matches(sudoers_args, args));
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}
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/* If running as sudoedit, all args are assumed to be paths. */
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if (strcmp(sudoers_cmnd, "sudoedit") == 0)
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flags = FNM_PATHNAME;
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debug_return_bool(fnmatch(sudoers_args, args, flags) == 0);
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}
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#ifndef SUDOERS_NAME_MATCH
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/*
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* Stat file by fd is possible, else by path.
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* Returns true on success, else false.
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*/
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static bool
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do_stat(int fd, const char *path, const char *runchroot, struct stat *sb)
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{
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char pathbuf[PATH_MAX];
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bool ret;
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debug_decl(do_stat, SUDOERS_DEBUG_MATCH);
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if (fd != -1) {
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ret = fstat(fd, sb) == 0;
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} else {
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/* Make path relative to the new root, if any. */
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if (runchroot != NULL) {
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const int len =
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snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, path);
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if (len >= ssizeof(pathbuf)) {
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errno = ENAMETOOLONG;
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debug_return_bool(false);
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}
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path = pathbuf;
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}
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ret = stat(path, sb) == 0;
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}
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debug_return_bool(ret);
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}
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/*
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* Perform intercept-specific checks.
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* Returns true if allowed, else false.
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*/
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static bool
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intercept_ok(const char *path, bool intercepted, struct stat *sb)
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{
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debug_decl(intercept_ok, SUDOERS_DEBUG_MATCH);
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if (intercepted) {
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if (!def_intercept_allow_setid && ISSET(sb->st_mode, S_ISUID|S_ISGID)) {
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sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
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"rejecting setid command %s", path);
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debug_return_bool(false);
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}
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}
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debug_return_bool(true);
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}
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#endif /* SUDOERS_NAME_MATCH */
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/*
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* Check whether the fd refers to a shell script with a "#!" shebang.
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*/
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static bool
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is_script(int fd)
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{
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bool ret = false;
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char magic[2];
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debug_decl(is_script, SUDOERS_DEBUG_MATCH);
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if (pread(fd, magic, 2, 0) == 2) {
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if (magic[0] == '#' && magic[1] == '!')
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ret = true;
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}
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debug_return_int(ret);
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}
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/*
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* Open path if fdexec is enabled or if a digest is present.
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* Returns false on error, else true.
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*/
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static bool
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open_cmnd(const char *path, const char *runchroot,
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const struct command_digest_list *digests, int *fdp)
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{
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int fd;
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char pathbuf[PATH_MAX];
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debug_decl(open_cmnd, SUDOERS_DEBUG_MATCH);
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/* Only open the file for fdexec or for digest matching. */
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if (def_fdexec != always && TAILQ_EMPTY(digests))
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debug_return_bool(true);
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/* Make path relative to the new root, if any. */
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if (runchroot != NULL) {
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const int len =
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snprintf(pathbuf, sizeof(pathbuf), "%s%s", runchroot, path);
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if (len >= ssizeof(pathbuf)) {
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errno = ENAMETOOLONG;
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debug_return_bool(false);
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}
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path = pathbuf;
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}
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fd = open(path, O_RDONLY|O_NONBLOCK);
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# ifdef O_EXEC
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if (fd == -1 && errno == EACCES && TAILQ_EMPTY(digests)) {
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/* Try again with O_EXEC if no digest is specified. */
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const int saved_errno = errno;
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if ((fd = open(path, O_EXEC)) == -1)
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errno = saved_errno;
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}
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# endif
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if (fd == -1)
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debug_return_bool(false);
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(void)fcntl(fd, F_SETFD, FD_CLOEXEC);
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*fdp = fd;
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debug_return_bool(true);
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}
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static void
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set_cmnd_fd(int fd)
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{
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debug_decl(set_cmnd_fd, SUDOERS_DEBUG_MATCH);
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if (cmnd_fd != -1)
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close(cmnd_fd);
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if (fd != -1) {
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if (def_fdexec == never) {
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/* Never use fexedcve() */
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close(fd);
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fd = -1;
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} else if (is_script(fd)) {
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char fdpath[PATH_MAX];
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struct stat sb;
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int flags;
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/* We can only use fexecve() on a script if /dev/fd/N exists. */
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(void)snprintf(fdpath, sizeof(fdpath), "/dev/fd/%d", fd);
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if (stat(fdpath, &sb) != 0) {
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/* Missing /dev/fd file, can't use fexecve(). */
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close(fd);
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fd = -1;
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} else {
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/*
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* Shell scripts go through namei twice so we can't have the
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* close on exec flag set on the fd for fexecve(2).
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*/
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flags = fcntl(fd, F_GETFD) & ~FD_CLOEXEC;
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(void)fcntl(fd, F_SETFD, flags);
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}
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}
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}
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cmnd_fd = fd;
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debug_return;
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}
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#ifndef SUDOERS_NAME_MATCH
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/*
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* Return true if user_cmnd names one of the inodes in dir, else false.
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*/
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static bool
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command_matches_dir(const char *sudoers_dir, size_t dlen, const char *runchroot,
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bool intercepted, const struct command_digest_list *digests)
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{
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char buf[PATH_MAX], sdbuf[PATH_MAX];
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struct stat sudoers_stat;
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struct dirent *dent;
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size_t chrootlen = 0;
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int fd = -1;
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DIR *dirp;
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debug_decl(command_matches_dir, SUDOERS_DEBUG_MATCH);
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/* Make sudoers_dir relative to the new root, if any. */
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if (runchroot != NULL) {
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const int len =
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snprintf(sdbuf, sizeof(sdbuf), "%s%s", runchroot, sudoers_dir);
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if (len >= ssizeof(sdbuf)) {
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errno = ENAMETOOLONG;
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debug_return_bool(false);
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}
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sudoers_dir = sdbuf;
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chrootlen = strlen(runchroot);
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}
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/*
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* Grot through directory entries, looking for user_base.
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*/
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dirp = opendir(sudoers_dir);
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if (dirp == NULL)
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debug_return_bool(false);
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if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
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closedir(dirp);
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debug_return_bool(false);
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}
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while ((dent = readdir(dirp)) != NULL) {
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if (fd != -1) {
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close(fd);
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fd = -1;
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}
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/* ignore paths > PATH_MAX (XXX - log) */
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buf[dlen] = '\0';
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if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
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continue;
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/* only stat if basenames are the same */
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if (strcmp(user_base, dent->d_name) != 0)
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continue;
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/* Open the file for fdexec or for digest matching. */
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if (!open_cmnd(buf, NULL, digests, &fd))
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continue;
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if (!do_stat(fd, buf, NULL, &sudoers_stat))
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continue;
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if (!intercept_ok(buf, intercepted, &sudoers_stat))
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continue;
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if (user_stat == NULL ||
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(user_stat->st_dev == sudoers_stat.st_dev &&
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user_stat->st_ino == sudoers_stat.st_ino)) {
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/* buf is already relative to runchroot */
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if (!digest_matches(fd, buf, NULL, digests))
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continue;
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free(safe_cmnd);
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if ((safe_cmnd = strdup(buf + chrootlen)) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__,
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U_("unable to allocate memory"));
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dent = NULL;
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}
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break;
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}
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}
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closedir(dirp);
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if (dent != NULL) {
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set_cmnd_fd(fd);
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debug_return_bool(true);
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}
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if (fd != -1)
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close(fd);
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debug_return_bool(false);
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}
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#else /* SUDOERS_NAME_MATCH */
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/*
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* Return true if user_cmnd names one of the inodes in dir, else false.
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*/
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static bool
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command_matches_dir(const char *sudoers_dir, size_t dlen, const char *runchroot,
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bool intercepted, const struct command_digest_list *digests)
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{
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int fd = -1;
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debug_decl(command_matches_dir, SUDOERS_DEBUG_MATCH);
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/* Match user_cmnd against sudoers_dir. */
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if (strncmp(user_cmnd, sudoers_dir, dlen) != 0 || user_cmnd[dlen] != '/')
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goto bad;
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/* Make sure user_cmnd is not in a subdir of sudoers_dir. */
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if (strchr(user_cmnd + dlen + 1, '\0') != NULL)
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goto bad;
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/* Open the file for fdexec or for digest matching. */
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if (!open_cmnd(user_cmnd, runchroot, digests, &fd))
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goto bad;
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if (!digest_matches(fd, user_cmnd, runchroot, digests))
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goto bad;
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set_cmnd_fd(fd);
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debug_return_bool(true);
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bad:
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if (fd != -1)
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close(fd);
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debug_return_bool(false);
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}
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#endif /* SUDOERS_NAME_MATCH */
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static bool
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command_matches_all(const char *runchroot,
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bool intercepted, const struct command_digest_list *digests)
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{
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#ifndef SUDOERS_NAME_MATCH
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struct stat sb;
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#endif
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int fd = -1;
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debug_decl(command_matches_all, SUDOERS_DEBUG_MATCH);
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if (user_cmnd[0] == '/') {
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#ifndef SUDOERS_NAME_MATCH
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/* Open the file for fdexec or for digest matching. */
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bool open_error = !open_cmnd(user_cmnd, runchroot, digests, &fd);
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/* A non-existent file is not an error for "sudo ALL". */
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if (do_stat(fd, user_cmnd, runchroot, &sb)) {
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if (open_error) {
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/* File exists but we couldn't open it above? */
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goto bad;
|
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}
|
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if (!intercept_ok(user_cmnd, intercepted, &sb))
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goto bad;
|
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}
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#else
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/* Open the file for fdexec or for digest matching. */
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(void)open_cmnd(user_cmnd, runchroot, digests, &fd);
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#endif
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}
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/* Check digest of user_cmnd since we have no sudoers_cmnd for ALL. */
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if (!digest_matches(fd, user_cmnd, runchroot, digests))
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goto bad;
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set_cmnd_fd(fd);
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|
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/* No need to set safe_cmnd for ALL. */
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debug_return_bool(true);
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bad:
|
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if (fd != -1)
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close(fd);
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debug_return_bool(false);
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}
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static bool
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command_matches_fnmatch(const char *sudoers_cmnd, const char *sudoers_args,
|
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const char *runchroot, bool intercepted,
|
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const struct command_digest_list *digests)
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{
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#ifndef SUDOERS_NAME_MATCH
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struct stat sb;
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#endif
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int fd = -1;
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debug_decl(command_matches_fnmatch, SUDOERS_DEBUG_MATCH);
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/*
|
|
* Return true if fnmatch(3) succeeds AND
|
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* a) there are no args in sudoers OR
|
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* b) there are no args on command line and none required by sudoers OR
|
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* c) there are args in sudoers and on command line and they match
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* else return false.
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*
|
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* Neither sudoers_cmnd nor user_cmnd are relative to runchroot.
|
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*/
|
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if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
|
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debug_return_bool(false);
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if (command_args_match(sudoers_cmnd, sudoers_args)) {
|
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/* Open the file for fdexec or for digest matching. */
|
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if (!open_cmnd(user_cmnd, runchroot, digests, &fd))
|
|
goto bad;
|
|
#ifndef SUDOERS_NAME_MATCH
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if (!do_stat(fd, user_cmnd, runchroot, &sb))
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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);
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|
|
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/* No need to set safe_cmnd since user_cmnd matches sudoers_cmnd */
|
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debug_return_bool(true);
|
|
bad:
|
|
if (fd != -1)
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close(fd);
|
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debug_return_bool(false);
|
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}
|
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debug_return_bool(false);
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}
|
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|
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static bool
|
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command_matches_regex(const char *sudoers_cmnd, const char *sudoers_args,
|
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const char *runchroot, bool intercepted,
|
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const struct command_digest_list *digests)
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{
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#ifndef SUDOERS_NAME_MATCH
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struct stat sb;
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#endif
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int fd = -1;
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debug_decl(command_matches_regex, SUDOERS_DEBUG_MATCH);
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|
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/*
|
|
* Return true if sudoers_cmnd regex matches user_cmnd AND
|
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* a) there are no args in sudoers OR
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* b) there are no args on command line and none required by sudoers OR
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* c) there are args in sudoers and on command line and they match
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* else return false.
|
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*
|
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* Neither sudoers_cmnd nor user_cmnd are relative to runchroot.
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*/
|
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if (!regex_matches(sudoers_cmnd, user_cmnd))
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debug_return_bool(false);
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|
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if (command_args_match(sudoers_cmnd, sudoers_args)) {
|
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/* Open the file for fdexec or for digest matching. */
|
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if (!open_cmnd(user_cmnd, runchroot, digests, &fd))
|
|
goto bad;
|
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#ifndef SUDOERS_NAME_MATCH
|
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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;
|
|
|
|
saved_user_cmnd = user_cmnd;
|
|
if (user_stat != NULL)
|
|
saved_user_stat = *user_stat;
|
|
status = set_cmnd_path(runchroot);
|
|
if (status != FOUND)
|
|
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);
|
|
}
|