2 * Copyright (c) 1996, 1998-2005, 2007-2011
3 * Todd C. Miller <Todd.Miller@courtesan.com>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
17 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
19 * Sponsored in part by the Defense Advanced Research Projects
20 * Agency (DARPA) and Air Force Research Laboratory, Air Force
21 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
26 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <sys/socket.h>
38 #endif /* STDC_HEADERS */
41 #endif /* HAVE_STRING_H */
44 #endif /* HAVE_STRINGS_H */
47 #endif /* HAVE_UNISTD_H */
50 #endif /* HAVE_FNMATCH */
51 #ifdef HAVE_EXTENDED_GLOB
53 #endif /* HAVE_EXTENDED_GLOB */
54 #ifdef HAVE_NETGROUP_H
55 # include <netgroup.h>
56 #endif /* HAVE_NETGROUP_H */
60 #include <netinet/in.h>
61 #include <arpa/inet.h>
65 # define NAMLEN(dirent) strlen((dirent)->d_name)
67 # define dirent direct
68 # define NAMLEN(dirent) (dirent)->d_namlen
69 # ifdef HAVE_SYS_NDIR_H
70 # include <sys/ndir.h>
72 # ifdef HAVE_SYS_DIR_H
81 #include "interfaces.h"
86 # include "emul/fnmatch.h"
87 #endif /* HAVE_FNMATCH */
88 #ifndef HAVE_EXTENDED_GLOB
89 # include "emul/glob.h"
90 #endif /* HAVE_EXTENDED_GLOB */
91 #ifdef USING_NONUNIX_GROUPS
93 #endif /* USING_NONUNIX_GROUPS */
95 static struct member_list empty;
97 static int command_matches_dir __P((char *, size_t));
98 static int command_matches_glob __P((char *, char *));
99 static int command_matches_fnmatch __P((char *, char *));
100 static int command_matches_normal __P((char *, char *));
103 * Returns TRUE if string 's' contains meta characters.
105 #define has_meta(s) (strpbrk(s, "\\?*[]") != NULL)
108 * Check for user described by pw in a list of members.
109 * Returns ALLOW, DENY or UNSPEC.
112 _userlist_matches(pw, list)
114 struct member_list *list;
118 int rval, matched = UNSPEC;
120 tq_foreach_rev(list, m) {
123 matched = !m->negated;
126 if (netgr_matches(m->name, NULL, NULL, pw->pw_name))
127 matched = !m->negated;
130 if (usergr_matches(m->name, pw->pw_name, pw))
131 matched = !m->negated;
134 if ((a = alias_find(m->name, USERALIAS)) != NULL) {
135 rval = _userlist_matches(pw, &a->members);
137 matched = m->negated ? !rval : rval;
142 if (userpw_matches(m->name, pw->pw_name, pw))
143 matched = !m->negated;
146 if (matched != UNSPEC)
153 userlist_matches(pw, list)
155 struct member_list *list;
158 return _userlist_matches(pw, list);
162 * Check for user described by pw in a list of members.
163 * If both lists are empty compare against def_runas_default.
164 * Returns ALLOW, DENY or UNSPEC.
167 _runaslist_matches(user_list, group_list)
168 struct member_list *user_list;
169 struct member_list *group_list;
174 int user_matched = UNSPEC;
175 int group_matched = UNSPEC;
177 if (runas_pw != NULL) {
178 /* If no runas user or runas group listed in sudoers, use default. */
179 if (tq_empty(user_list) && tq_empty(group_list))
180 return userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw);
182 tq_foreach_rev(user_list, m) {
185 user_matched = !m->negated;
188 if (netgr_matches(m->name, NULL, NULL, runas_pw->pw_name))
189 user_matched = !m->negated;
192 if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
193 user_matched = !m->negated;
196 if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
197 rval = _runaslist_matches(&a->members, &empty);
199 user_matched = m->negated ? !rval : rval;
204 if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
205 user_matched = !m->negated;
208 if (user_matched != UNSPEC)
213 if (runas_gr != NULL) {
214 if (user_matched == UNSPEC) {
215 if (runas_pw == NULL || strcmp(runas_pw->pw_name, user_name) == 0)
216 user_matched = ALLOW; /* only changing group */
218 tq_foreach_rev(group_list, m) {
221 group_matched = !m->negated;
224 if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
225 rval = _runaslist_matches(&a->members, &empty);
227 group_matched = m->negated ? !rval : rval;
232 if (group_matches(m->name, runas_gr))
233 group_matched = !m->negated;
236 if (group_matched != UNSPEC)
241 if (user_matched == DENY || group_matched == DENY)
243 if (user_matched == group_matched || runas_gr == NULL)
249 runaslist_matches(user_list, group_list)
250 struct member_list *user_list;
251 struct member_list *group_list;
254 return _runaslist_matches(user_list ? user_list : &empty,
255 group_list ? group_list : &empty);
259 * Check for host and shost in a list of members.
260 * Returns ALLOW, DENY or UNSPEC.
263 _hostlist_matches(list)
264 struct member_list *list;
268 int rval, matched = UNSPEC;
270 tq_foreach_rev(list, m) {
273 matched = !m->negated;
276 if (netgr_matches(m->name, user_host, user_shost, NULL))
277 matched = !m->negated;
280 if (addr_matches(m->name))
281 matched = !m->negated;
284 if ((a = alias_find(m->name, HOSTALIAS)) != NULL) {
285 rval = _hostlist_matches(&a->members);
287 matched = m->negated ? !rval : rval;
292 if (hostname_matches(user_shost, user_host, m->name))
293 matched = !m->negated;
296 if (matched != UNSPEC)
303 hostlist_matches(list)
304 struct member_list *list;
307 return _hostlist_matches(list);
311 * Check for cmnd and args in a list of members.
312 * Returns ALLOW, DENY or UNSPEC.
315 _cmndlist_matches(list)
316 struct member_list *list;
319 int matched = UNSPEC;
321 tq_foreach_rev(list, m) {
322 matched = cmnd_matches(m);
323 if (matched != UNSPEC)
330 cmndlist_matches(list)
331 struct member_list *list;
334 return _cmndlist_matches(list);
338 * Check cmnd and args.
339 * Returns ALLOW, DENY or UNSPEC.
346 struct sudo_command *c;
347 int rval, matched = UNSPEC;
351 matched = !m->negated;
355 if ((a = alias_find(m->name, CMNDALIAS)) != NULL) {
356 rval = _cmndlist_matches(&a->members);
358 matched = m->negated ? !rval : rval;
362 c = (struct sudo_command *)m->name;
363 if (command_matches(c->cmnd, c->args))
364 matched = !m->negated;
371 command_args_match(sudoers_cmnd, sudoers_args)
378 * If no args specified in sudoers, any user args are allowed.
379 * If the empty string is specified in sudoers, no user args are allowed.
382 (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)))
385 * If args are specified in sudoers, they must match the user args.
386 * If running as sudoedit, all args are assumed to be paths.
389 /* For sudoedit, all args are assumed to be pathnames. */
390 if (strcmp(sudoers_cmnd, "sudoedit") == 0)
391 flags = FNM_PATHNAME;
392 if (fnmatch(sudoers_args, user_args ? user_args : "", flags) == 0)
399 * If path doesn't end in /, return TRUE iff cmnd & path name the same inode;
400 * otherwise, return TRUE if user_cmnd names one of the inodes in path.
403 command_matches(sudoers_cmnd, sudoers_args)
407 /* Check for pseudo-commands */
408 if (sudoers_cmnd[0] != '/') {
410 * Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
411 * a) there are no args in sudoers OR
412 * b) there are no args on command line and none req by sudoers OR
413 * c) there are args in sudoers and on command line and they match
415 if (strcmp(sudoers_cmnd, "sudoedit") != 0 ||
416 strcmp(user_cmnd, "sudoedit") != 0)
418 if (command_args_match(sudoers_cmnd, sudoers_args)) {
420 safe_cmnd = estrdup(sudoers_cmnd);
426 if (has_meta(sudoers_cmnd)) {
428 * If sudoers_cmnd has meta characters in it, we need to
429 * use glob(3) and/or fnmatch(3) to do the matching.
432 return command_matches_fnmatch(sudoers_cmnd, sudoers_args);
433 return command_matches_glob(sudoers_cmnd, sudoers_args);
435 return command_matches_normal(sudoers_cmnd, sudoers_args);
439 command_matches_fnmatch(sudoers_cmnd, sudoers_args)
444 * Return true if fnmatch(3) succeeds AND
445 * a) there are no args in sudoers OR
446 * b) there are no args on command line and none required by sudoers OR
447 * c) there are args in sudoers and on command line and they match
450 if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
452 if (command_args_match(sudoers_cmnd, sudoers_args)) {
455 safe_cmnd = estrdup(user_cmnd);
462 command_matches_glob(sudoers_cmnd, sudoers_args)
466 struct stat sudoers_stat;
468 char **ap, *base, *cp;
472 * First check to see if we can avoid the call to glob(3).
473 * Short circuit if there are no meta chars in the command itself
474 * and user_base and basename(sudoers_cmnd) don't match.
476 dlen = strlen(sudoers_cmnd);
477 if (sudoers_cmnd[dlen - 1] != '/') {
478 if ((base = strrchr(sudoers_cmnd, '/')) != NULL) {
480 if (!has_meta(base) && strcmp(user_base, base) != 0)
485 * Return true if we find a match in the glob(3) results AND
486 * a) there are no args in sudoers OR
487 * b) there are no args on command line and none required by sudoers OR
488 * c) there are args in sudoers and on command line and they match
491 #define GLOB_FLAGS (GLOB_NOSORT | GLOB_MARK | GLOB_BRACE | GLOB_TILDE)
492 if (glob(sudoers_cmnd, GLOB_FLAGS, NULL, &gl) != 0 || gl.gl_pathc == 0) {
496 /* For each glob match, compare basename, st_dev and st_ino. */
497 for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) {
498 /* If it ends in '/' it is a directory spec. */
500 if (cp[dlen - 1] == '/') {
501 if (command_matches_dir(cp, dlen))
506 /* Only proceed if user_base and basename(cp) match */
507 if ((base = strrchr(cp, '/')) != NULL)
511 if (strcmp(user_base, base) != 0 ||
512 stat(cp, &sudoers_stat) == -1)
514 if (user_stat == NULL ||
515 (user_stat->st_dev == sudoers_stat.st_dev &&
516 user_stat->st_ino == sudoers_stat.st_ino)) {
518 safe_cmnd = estrdup(cp);
526 if (command_args_match(sudoers_cmnd, sudoers_args)) {
528 safe_cmnd = estrdup(user_cmnd);
535 command_matches_normal(sudoers_cmnd, sudoers_args)
539 struct stat sudoers_stat;
543 /* If it ends in '/' it is a directory spec. */
544 dlen = strlen(sudoers_cmnd);
545 if (sudoers_cmnd[dlen - 1] == '/')
546 return command_matches_dir(sudoers_cmnd, dlen);
548 /* Only proceed if user_base and basename(sudoers_cmnd) match */
549 if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
553 if (strcmp(user_base, base) != 0 ||
554 stat(sudoers_cmnd, &sudoers_stat) == -1)
558 * Return true if inode/device matches AND
559 * a) there are no args in sudoers OR
560 * b) there are no args on command line and none req by sudoers OR
561 * c) there are args in sudoers and on command line and they match
563 if (user_stat != NULL &&
564 (user_stat->st_dev != sudoers_stat.st_dev ||
565 user_stat->st_ino != sudoers_stat.st_ino))
567 if (command_args_match(sudoers_cmnd, sudoers_args)) {
569 safe_cmnd = estrdup(sudoers_cmnd);
576 * Return TRUE if user_cmnd names one of the inodes in dir, else FALSE.
579 command_matches_dir(sudoers_dir, dlen)
583 struct stat sudoers_stat;
589 * Grot through directory entries, looking for user_base.
591 dirp = opendir(sudoers_dir);
595 if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
599 while ((dent = readdir(dirp)) != NULL) {
600 /* ignore paths > PATH_MAX (XXX - log) */
602 if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
605 /* only stat if basenames are the same */
606 if (strcmp(user_base, dent->d_name) != 0 ||
607 stat(buf, &sudoers_stat) == -1)
609 if (user_stat == NULL ||
610 (user_stat->st_dev == sudoers_stat.st_dev &&
611 user_stat->st_ino == sudoers_stat.st_ino)) {
613 safe_cmnd = estrdup(buf);
627 union sudo_in_addr_un addr;
628 struct interface *ifp;
635 if (inet_pton(AF_INET6, n, &addr.ip6) > 0) {
641 addr.ip4.s_addr = inet_addr(n);
644 for (i = 0; i < num_interfaces; i++) {
645 ifp = &interfaces[i];
646 if (ifp->family != family)
650 if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
651 (ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
657 if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
658 sizeof(addr.ip6.s6_addr)) == 0)
660 for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
661 if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
664 if (j == sizeof(addr.ip6.s6_addr))
674 addr_matches_if_netmask(n, m)
679 union sudo_in_addr_un addr, mask;
680 struct interface *ifp;
687 if (inet_pton(AF_INET6, n, &addr.ip6) > 0)
693 addr.ip4.s_addr = inet_addr(n);
696 if (family == AF_INET) {
698 mask.ip4.s_addr = inet_addr(m);
701 mask.ip4.s_addr = 0xffffffff;
702 mask.ip4.s_addr >>= i;
703 mask.ip4.s_addr <<= i;
704 mask.ip4.s_addr = htonl(mask.ip4.s_addr);
709 if (inet_pton(AF_INET6, m, &mask.ip6) <= 0) {
711 for (i = 0; i < 16; i++) {
713 mask.ip6.s6_addr[i] = 0;
714 else if (i * 8 + 8 <= j)
715 mask.ip6.s6_addr[i] = 0xff;
717 mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
721 #endif /* HAVE_IN6_ADDR */
723 for (i = 0; i < num_interfaces; i++) {
724 ifp = &interfaces[i];
725 if (ifp->family != family)
729 if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
733 for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
734 if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
737 if (j == sizeof(addr.ip6.s6_addr))
739 #endif /* HAVE_IN6_ADDR */
747 * Returns TRUE if "n" is one of our ip addresses or if
748 * "n" is a network that we are on, else returns FALSE.
757 /* If there's an explicit netmask, use it. */
758 if ((m = strchr(n, '/'))) {
760 retval = addr_matches_if_netmask(n, m);
763 retval = addr_matches_if(n);
769 * Returns TRUE if the hostname matches the pattern, else FALSE
772 hostname_matches(shost, lhost, pattern)
777 if (has_meta(pattern)) {
778 if (strchr(pattern, '.'))
779 return !fnmatch(pattern, lhost, FNM_CASEFOLD);
781 return !fnmatch(pattern, shost, FNM_CASEFOLD);
783 if (strchr(pattern, '.'))
784 return !strcasecmp(lhost, pattern);
786 return !strcasecmp(shost, pattern);
791 * Returns TRUE if the user/uid from sudoers matches the specified user/uid,
792 * else returns FALSE.
795 userpw_matches(sudoers_user, user, pw)
800 if (pw != NULL && *sudoers_user == '#') {
801 uid_t uid = (uid_t) atoi(sudoers_user + 1);
802 if (uid == pw->pw_uid)
805 return strcmp(sudoers_user, user) == 0;
809 * Returns TRUE if the group/gid from sudoers matches the specified group/gid,
810 * else returns FALSE.
813 group_matches(sudoers_group, gr)
817 if (*sudoers_group == '#') {
818 gid_t gid = (gid_t) atoi(sudoers_group + 1);
819 if (gid == gr->gr_gid)
822 return strcmp(gr->gr_name, sudoers_group) == 0;
826 * Returns TRUE if the given user belongs to the named group,
827 * else returns FALSE.
830 usergr_matches(group, user, pw)
836 struct passwd *pw0 = NULL;
838 /* make sure we have a valid usergroup, sudo style */
842 #ifdef USING_NONUNIX_GROUPS
844 matched = sudo_nonunix_groupcheck(++group, user, pw);
847 #endif /* USING_NONUNIX_GROUPS */
849 /* look up user's primary gid in the passwd file */
851 if ((pw0 = sudo_getpwnam(user)) == NULL)
856 if (user_in_group(pw, group)) {
861 #ifdef USING_NONUNIX_GROUPS
862 /* not a Unix group, could be an AD group */
863 if (sudo_nonunix_groupcheck_available() &&
864 sudo_nonunix_groupcheck(group, user, pw)) {
868 #endif /* USING_NONUNIX_GROUPS */
878 * Returns TRUE if "host" and "user" belong to the netgroup "netgr",
879 * else return FALSE. Either of "host", "shost" or "user" may be NULL
880 * in which case that argument is not checked...
882 * XXX - swap order of host & shost
885 netgr_matches(netgr, lhost, shost, user)
892 #ifdef HAVE_GETDOMAINNAME
893 static int initialized;
896 /* make sure we have a valid netgroup, sudo style */
900 #ifdef HAVE_GETDOMAINNAME
901 /* get the domain name (if any) */
903 domain = (char *) emalloc(MAXHOSTNAMELEN + 1);
904 if (getdomainname(domain, MAXHOSTNAMELEN + 1) == -1 || *domain == '\0') {
910 #endif /* HAVE_GETDOMAINNAME */
913 if (innetgr(netgr, lhost, user, domain))
915 else if (lhost != shost && innetgr(netgr, shost, user, domain))
917 #endif /* HAVE_INNETGR */