2 * Copyright (c) 1996, 1998-2005, 2007-2010
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;
173 int rval, matched = UNSPEC;
175 if (runas_gr != NULL) {
176 if (tq_empty(group_list))
177 return(DENY); /* group was specified but none in sudoers */
178 if (runas_pw != NULL && strcmp(runas_pw->pw_name, user_name) &&
180 return(DENY); /* user was specified but none in sudoers */
183 if (tq_empty(user_list) && tq_empty(group_list))
184 return(userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw));
186 if (runas_pw != NULL) {
187 tq_foreach_rev(user_list, m) {
190 matched = !m->negated;
193 if (netgr_matches(m->name, NULL, NULL, runas_pw->pw_name))
194 matched = !m->negated;
197 if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
198 matched = !m->negated;
201 if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
202 rval = _runaslist_matches(&a->members, &empty);
204 matched = m->negated ? !rval : rval;
209 if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
210 matched = !m->negated;
213 if (matched != UNSPEC)
218 if (runas_gr != NULL) {
219 tq_foreach_rev(group_list, m) {
222 matched = !m->negated;
225 if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
226 rval = _runaslist_matches(&a->members, &empty);
228 matched = m->negated ? !rval : rval;
233 if (group_matches(m->name, runas_gr))
234 matched = !m->negated;
237 if (matched != UNSPEC)
246 runaslist_matches(user_list, group_list)
247 struct member_list *user_list;
248 struct member_list *group_list;
251 return(_runaslist_matches(user_list ? user_list : &empty,
252 group_list ? group_list : &empty));
256 * Check for host and shost in a list of members.
257 * Returns ALLOW, DENY or UNSPEC.
260 _hostlist_matches(list)
261 struct member_list *list;
265 int rval, matched = UNSPEC;
267 tq_foreach_rev(list, m) {
270 matched = !m->negated;
273 if (netgr_matches(m->name, user_host, user_shost, NULL))
274 matched = !m->negated;
277 if (addr_matches(m->name))
278 matched = !m->negated;
281 if ((a = alias_find(m->name, HOSTALIAS)) != NULL) {
282 rval = _hostlist_matches(&a->members);
284 matched = m->negated ? !rval : rval;
289 if (hostname_matches(user_shost, user_host, m->name))
290 matched = !m->negated;
293 if (matched != UNSPEC)
300 hostlist_matches(list)
301 struct member_list *list;
304 return(_hostlist_matches(list));
308 * Check for cmnd and args in a list of members.
309 * Returns ALLOW, DENY or UNSPEC.
312 _cmndlist_matches(list)
313 struct member_list *list;
316 int matched = UNSPEC;
318 tq_foreach_rev(list, m) {
319 matched = cmnd_matches(m);
320 if (matched != UNSPEC)
327 cmndlist_matches(list)
328 struct member_list *list;
331 return(_cmndlist_matches(list));
335 * Check cmnd and args.
336 * Returns ALLOW, DENY or UNSPEC.
343 struct sudo_command *c;
344 int rval, matched = UNSPEC;
348 matched = !m->negated;
352 if ((a = alias_find(m->name, CMNDALIAS)) != NULL) {
353 rval = _cmndlist_matches(&a->members);
355 matched = m->negated ? !rval : rval;
359 c = (struct sudo_command *)m->name;
360 if (command_matches(c->cmnd, c->args))
361 matched = !m->negated;
368 * If path doesn't end in /, return TRUE iff cmnd & path name the same inode;
369 * otherwise, return TRUE if user_cmnd names one of the inodes in path.
372 command_matches(sudoers_cmnd, sudoers_args)
376 /* Check for pseudo-commands */
377 if (sudoers_cmnd[0] != '/') {
379 * Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
380 * a) there are no args in sudoers OR
381 * b) there are no args on command line and none req by sudoers OR
382 * c) there are args in sudoers and on command line and they match
384 if (strcmp(sudoers_cmnd, "sudoedit") != 0 ||
385 strcmp(user_cmnd, "sudoedit") != 0)
388 (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
390 fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
392 safe_cmnd = estrdup(sudoers_cmnd);
398 if (has_meta(sudoers_cmnd)) {
400 * If sudoers_cmnd has meta characters in it, we need to
401 * use glob(3) and/or fnmatch(3) to do the matching.
404 return(command_matches_fnmatch(sudoers_cmnd, sudoers_args));
405 return(command_matches_glob(sudoers_cmnd, sudoers_args));
407 return(command_matches_normal(sudoers_cmnd, sudoers_args));
411 command_matches_fnmatch(sudoers_cmnd, sudoers_args)
416 * Return true if fnmatch(3) succeeds AND
417 * a) there are no args in sudoers OR
418 * b) there are no args on command line and none required by sudoers OR
419 * c) there are args in sudoers and on command line and they match
422 if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
425 (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
427 fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
430 safe_cmnd = estrdup(user_cmnd);
437 command_matches_glob(sudoers_cmnd, sudoers_args)
441 struct stat sudoers_stat;
443 char **ap, *base, *cp;
447 * First check to see if we can avoid the call to glob(3).
448 * Short circuit if there are no meta chars in the command itself
449 * and user_base and basename(sudoers_cmnd) don't match.
451 dlen = strlen(sudoers_cmnd);
452 if (sudoers_cmnd[dlen - 1] != '/') {
453 if ((base = strrchr(sudoers_cmnd, '/')) != NULL) {
455 if (!has_meta(base) && strcmp(user_base, base) != 0)
460 * Return true if we find a match in the glob(3) results AND
461 * a) there are no args in sudoers OR
462 * b) there are no args on command line and none required by sudoers OR
463 * c) there are args in sudoers and on command line and they match
466 #define GLOB_FLAGS (GLOB_NOSORT | GLOB_MARK | GLOB_BRACE | GLOB_TILDE)
467 if (glob(sudoers_cmnd, GLOB_FLAGS, NULL, &gl) != 0 || gl.gl_pathc == 0) {
471 /* For each glob match, compare basename, st_dev and st_ino. */
472 for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) {
473 /* If it ends in '/' it is a directory spec. */
475 if (cp[dlen - 1] == '/') {
476 if (command_matches_dir(cp, dlen))
481 /* Only proceed if user_base and basename(cp) match */
482 if ((base = strrchr(cp, '/')) != NULL)
486 if (strcmp(user_base, base) != 0 ||
487 stat(cp, &sudoers_stat) == -1)
489 if (user_stat == NULL ||
490 (user_stat->st_dev == sudoers_stat.st_dev &&
491 user_stat->st_ino == sudoers_stat.st_ino)) {
493 safe_cmnd = estrdup(cp);
502 (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
504 fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
506 safe_cmnd = estrdup(user_cmnd);
513 command_matches_normal(sudoers_cmnd, sudoers_args)
517 struct stat sudoers_stat;
521 /* If it ends in '/' it is a directory spec. */
522 dlen = strlen(sudoers_cmnd);
523 if (sudoers_cmnd[dlen - 1] == '/')
524 return(command_matches_dir(sudoers_cmnd, dlen));
526 /* Only proceed if user_base and basename(sudoers_cmnd) match */
527 if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
531 if (strcmp(user_base, base) != 0 ||
532 stat(sudoers_cmnd, &sudoers_stat) == -1)
536 * Return true if inode/device matches AND
537 * a) there are no args in sudoers OR
538 * b) there are no args on command line and none req by sudoers OR
539 * c) there are args in sudoers and on command line and they match
541 if (user_stat != NULL &&
542 (user_stat->st_dev != sudoers_stat.st_dev ||
543 user_stat->st_ino != sudoers_stat.st_ino))
546 (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)) ||
548 fnmatch(sudoers_args, user_args ? user_args : "", 0) == 0)) {
550 safe_cmnd = estrdup(sudoers_cmnd);
557 * Return TRUE if user_cmnd names one of the inodes in dir, else FALSE.
560 command_matches_dir(sudoers_dir, dlen)
564 struct stat sudoers_stat;
570 * Grot through directory entries, looking for user_base.
572 dirp = opendir(sudoers_dir);
576 if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
580 while ((dent = readdir(dirp)) != NULL) {
581 /* ignore paths > PATH_MAX (XXX - log) */
583 if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
586 /* only stat if basenames are the same */
587 if (strcmp(user_base, dent->d_name) != 0 ||
588 stat(buf, &sudoers_stat) == -1)
590 if (user_stat->st_dev == sudoers_stat.st_dev &&
591 user_stat->st_ino == sudoers_stat.st_ino) {
593 safe_cmnd = estrdup(buf);
599 return(dent != NULL);
607 union sudo_in_addr_un addr;
608 struct interface *ifp;
615 if (inet_pton(AF_INET6, n, &addr.ip6) > 0) {
621 addr.ip4.s_addr = inet_addr(n);
624 for (i = 0; i < num_interfaces; i++) {
625 ifp = &interfaces[i];
626 if (ifp->family != family)
630 if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
631 (ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
637 if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
638 sizeof(addr.ip6.s6_addr)) == 0)
640 for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
641 if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
644 if (j == sizeof(addr.ip6.s6_addr))
654 addr_matches_if_netmask(n, m)
659 union sudo_in_addr_un addr, mask;
660 struct interface *ifp;
667 if (inet_pton(AF_INET6, n, &addr.ip6) > 0)
673 addr.ip4.s_addr = inet_addr(n);
676 if (family == AF_INET) {
678 mask.ip4.s_addr = inet_addr(m);
681 mask.ip4.s_addr = 0xffffffff;
682 mask.ip4.s_addr >>= i;
683 mask.ip4.s_addr <<= i;
684 mask.ip4.s_addr = htonl(mask.ip4.s_addr);
689 if (inet_pton(AF_INET6, m, &mask.ip6) <= 0) {
691 for (i = 0; i < 16; i++) {
693 mask.ip6.s6_addr[i] = 0;
694 else if (i * 8 + 8 <= j)
695 mask.ip6.s6_addr[i] = 0xff;
697 mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
701 #endif /* HAVE_IN6_ADDR */
703 for (i = 0; i < num_interfaces; i++) {
704 ifp = &interfaces[i];
705 if (ifp->family != family)
709 if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
713 for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
714 if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
717 if (j == sizeof(addr.ip6.s6_addr))
719 #endif /* HAVE_IN6_ADDR */
727 * Returns TRUE if "n" is one of our ip addresses or if
728 * "n" is a network that we are on, else returns FALSE.
737 /* If there's an explicit netmask, use it. */
738 if ((m = strchr(n, '/'))) {
740 retval = addr_matches_if_netmask(n, m);
743 retval = addr_matches_if(n);
749 * Returns TRUE if the hostname matches the pattern, else FALSE
752 hostname_matches(shost, lhost, pattern)
757 if (has_meta(pattern)) {
758 if (strchr(pattern, '.'))
759 return(!fnmatch(pattern, lhost, FNM_CASEFOLD));
761 return(!fnmatch(pattern, shost, FNM_CASEFOLD));
763 if (strchr(pattern, '.'))
764 return(!strcasecmp(lhost, pattern));
766 return(!strcasecmp(shost, pattern));
771 * Returns TRUE if the user/uid from sudoers matches the specified user/uid,
772 * else returns FALSE.
775 userpw_matches(sudoers_user, user, pw)
780 if (pw != NULL && *sudoers_user == '#') {
781 uid_t uid = (uid_t) atoi(sudoers_user + 1);
782 if (uid == pw->pw_uid)
785 return(strcmp(sudoers_user, user) == 0);
789 * Returns TRUE if the group/gid from sudoers matches the specified group/gid,
790 * else returns FALSE.
793 group_matches(sudoers_group, gr)
797 if (*sudoers_group == '#') {
798 gid_t gid = (gid_t) atoi(sudoers_group + 1);
799 if (gid == gr->gr_gid)
802 return(strcmp(gr->gr_name, sudoers_group) == 0);
806 * Returns TRUE if the given user belongs to the named group,
807 * else returns FALSE.
810 usergr_matches(group, user, pw)
815 /* make sure we have a valid usergroup, sudo style */
819 #ifdef USING_NONUNIX_GROUPS
821 return(sudo_nonunix_groupcheck(++group, user, pw));
822 #endif /* USING_NONUNIX_GROUPS */
824 /* look up user's primary gid in the passwd file */
825 if (pw == NULL && (pw = sudo_getpwnam(user)) == NULL)
828 if (user_in_group(pw, group))
831 #ifdef USING_NONUNIX_GROUPS
832 /* not a Unix group, could be an AD group */
833 if (sudo_nonunix_groupcheck_available() &&
834 sudo_nonunix_groupcheck(group, user, pw))
836 #endif /* USING_NONUNIX_GROUPS */
842 * Returns TRUE if "host" and "user" belong to the netgroup "netgr",
843 * else return FALSE. Either of "host", "shost" or "user" may be NULL
844 * in which case that argument is not checked...
846 * XXX - swap order of host & shost
849 netgr_matches(netgr, lhost, shost, user)
856 #ifdef HAVE_GETDOMAINNAME
857 static int initialized;
860 /* make sure we have a valid netgroup, sudo style */
864 #ifdef HAVE_GETDOMAINNAME
865 /* get the domain name (if any) */
867 domain = (char *) emalloc(MAXHOSTNAMELEN + 1);
868 if (getdomainname(domain, MAXHOSTNAMELEN + 1) == -1 || *domain == '\0') {
874 #endif /* HAVE_GETDOMAINNAME */
877 if (innetgr(netgr, lhost, user, domain))
879 else if (lhost != shost && innetgr(netgr, shost, user, domain))
881 #endif /* HAVE_INNETGR */