1: /*
2: * Copyright (c) 1996, 1998-2005, 2007-2013
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
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.
8: *
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.
18: *
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.
22: */
23:
24: #include <config.h>
25:
26: #include <sys/types.h>
27: #include <sys/stat.h>
28: #include <stdio.h>
29: #ifdef STDC_HEADERS
30: # include <stdlib.h>
31: # include <stddef.h>
32: #else
33: # ifdef HAVE_STDLIB_H
34: # include <stdlib.h>
35: # endif
36: #endif /* STDC_HEADERS */
37: #ifdef HAVE_STRING_H
38: # include <string.h>
39: #endif /* HAVE_STRING_H */
40: #ifdef HAVE_STRINGS_H
41: # include <strings.h>
42: #endif /* HAVE_STRINGS_H */
43: #if defined(HAVE_STDINT_H)
44: # include <stdint.h>
45: #elif defined(HAVE_INTTYPES_H)
46: # include <inttypes.h>
47: #endif
48: #ifdef HAVE_UNISTD_H
49: # include <unistd.h>
50: #endif /* HAVE_UNISTD_H */
51: #ifdef HAVE_FNMATCH
52: # include <fnmatch.h>
53: #else
54: # include "compat/fnmatch.h"
55: #endif /* HAVE_FNMATCH */
56: #ifndef SUDOERS_NAME_MATCH
57: # ifdef HAVE_GLOB
58: # include <glob.h>
59: # else
60: # include "compat/glob.h"
61: # endif /* HAVE_GLOB */
62: #endif /* SUDOERS_NAME_MATCH */
63: #ifdef HAVE_NETGROUP_H
64: # include <netgroup.h>
65: #else
66: # include <netdb.h>
67: #endif /* HAVE_NETGROUP_H */
68: #ifdef HAVE_DIRENT_H
69: # include <dirent.h>
70: # define NAMLEN(dirent) strlen((dirent)->d_name)
71: #else
72: # define dirent direct
73: # define NAMLEN(dirent) (dirent)->d_namlen
74: # ifdef HAVE_SYS_NDIR_H
75: # include <sys/ndir.h>
76: # endif
77: # ifdef HAVE_SYS_DIR_H
78: # include <sys/dir.h>
79: # endif
80: # ifdef HAVE_NDIR_H
81: # include <ndir.h>
82: # endif
83: #endif
84: #include <ctype.h>
85: #include <pwd.h>
86: #include <grp.h>
87: #include <errno.h>
88:
89: #include "sudoers.h"
90: #include "parse.h"
91: #include "sha2.h"
92: #include <gram.h>
93:
94: static struct member_list empty = TAILQ_HEAD_INITIALIZER(empty);
95:
96: static bool command_matches_dir(const char *sudoers_dir, size_t dlen);
97: #ifndef SUDOERS_NAME_MATCH
98: static bool command_matches_glob(const char *sudoers_cmnd, const char *sudoers_args);
99: #endif
100: static bool command_matches_fnmatch(const char *sudoers_cmnd, const char *sudoers_args);
101: static bool command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const struct sudo_digest *digest);
102:
103: /*
104: * Returns true if string 's' contains meta characters.
105: */
106: #define has_meta(s) (strpbrk(s, "\\?*[]") != NULL)
107:
108: /*
109: * Check for user described by pw in a list of members.
110: * Returns ALLOW, DENY or UNSPEC.
111: */
112: int
113: userlist_matches(const struct passwd *pw, const struct member_list *list)
114: {
115: struct member *m;
116: struct alias *a;
117: int rval, matched = UNSPEC;
118: debug_decl(userlist_matches, SUDO_DEBUG_MATCH)
119:
120: TAILQ_FOREACH_REVERSE(m, list, member_list, entries) {
121: switch (m->type) {
122: case ALL:
123: matched = !m->negated;
124: break;
125: case NETGROUP:
126: if (netgr_matches(m->name, NULL, NULL, pw->pw_name))
127: matched = !m->negated;
128: break;
129: case USERGROUP:
130: if (usergr_matches(m->name, pw->pw_name, pw))
131: matched = !m->negated;
132: break;
133: case ALIAS:
134: if ((a = alias_get(m->name, USERALIAS)) != NULL) {
135: rval = userlist_matches(pw, &a->members);
136: if (rval != UNSPEC)
137: matched = m->negated ? !rval : rval;
138: alias_put(a);
139: break;
140: }
141: /* FALLTHROUGH */
142: case WORD:
143: if (userpw_matches(m->name, pw->pw_name, pw))
144: matched = !m->negated;
145: break;
146: }
147: if (matched != UNSPEC)
148: break;
149: }
150: debug_return_bool(matched);
151: }
152:
153: /*
154: * Check for user described by pw in a list of members.
155: * If both lists are empty compare against def_runas_default.
156: * Returns ALLOW, DENY or UNSPEC.
157: */
158: int
159: runaslist_matches(const struct member_list *user_list,
160: const struct member_list *group_list, struct member **matching_user,
161: struct member **matching_group)
162: {
163: struct member *m;
164: struct alias *a;
165: int rval;
166: int user_matched = UNSPEC;
167: int group_matched = UNSPEC;
168: debug_decl(runaslist_matches, SUDO_DEBUG_MATCH)
169:
170: if (runas_pw != NULL) {
171: /* If no runas user or runas group listed in sudoers, use default. */
172: if (user_list == NULL && group_list == NULL)
173: debug_return_int(userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw));
174:
175: if (user_list != NULL) {
176: TAILQ_FOREACH_REVERSE(m, user_list, member_list, entries) {
177: switch (m->type) {
178: case ALL:
179: user_matched = !m->negated;
180: break;
181: case NETGROUP:
182: if (netgr_matches(m->name, NULL, NULL, runas_pw->pw_name))
183: user_matched = !m->negated;
184: break;
185: case USERGROUP:
186: if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
187: user_matched = !m->negated;
188: break;
189: case ALIAS:
190: if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
191: rval = runaslist_matches(&a->members, &empty,
192: matching_user, NULL);
193: if (rval != UNSPEC)
194: user_matched = m->negated ? !rval : rval;
195: alias_put(a);
196: break;
197: }
198: /* FALLTHROUGH */
199: case WORD:
200: if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
201: user_matched = !m->negated;
202: break;
203: case MYSELF:
204: if (!ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED) ||
205: strcmp(user_name, runas_pw->pw_name) == 0)
206: user_matched = !m->negated;
207: break;
208: }
209: if (user_matched != UNSPEC) {
210: if (matching_user != NULL && m->type != ALIAS)
211: *matching_user = m;
212: break;
213: }
214: }
215: }
216: }
217:
218: if (runas_gr != NULL) {
219: if (user_matched == UNSPEC) {
220: if (runas_pw == NULL || strcmp(runas_pw->pw_name, user_name) == 0)
221: user_matched = ALLOW; /* only changing group */
222: }
223: if (group_list != NULL) {
224: TAILQ_FOREACH_REVERSE(m, group_list, member_list, entries) {
225: switch (m->type) {
226: case ALL:
227: group_matched = !m->negated;
228: break;
229: case ALIAS:
230: if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
231: rval = runaslist_matches(&empty, &a->members,
232: NULL, matching_group);
233: if (rval != UNSPEC)
234: group_matched = m->negated ? !rval : rval;
235: alias_put(a);
236: break;
237: }
238: /* FALLTHROUGH */
239: case WORD:
240: if (group_matches(m->name, runas_gr))
241: group_matched = !m->negated;
242: break;
243: }
244: if (group_matched != UNSPEC) {
245: if (matching_group != NULL && m->type != ALIAS)
246: *matching_group = m;
247: break;
248: }
249: }
250: }
251: if (group_matched == UNSPEC) {
252: if (runas_pw != NULL && runas_pw->pw_gid == runas_gr->gr_gid)
253: group_matched = ALLOW; /* runas group matches passwd db */
254: }
255: }
256:
257: if (user_matched == DENY || group_matched == DENY)
258: debug_return_int(DENY);
259: if (user_matched == group_matched || runas_gr == NULL)
260: debug_return_int(user_matched);
261: debug_return_int(UNSPEC);
262: }
263:
264: /*
265: * Check for host and shost in a list of members.
266: * Returns ALLOW, DENY or UNSPEC.
267: */
268: int
269: hostlist_matches(const struct member_list *list)
270: {
271: struct member *m;
272: struct alias *a;
273: int rval, matched = UNSPEC;
274: debug_decl(hostlist_matches, SUDO_DEBUG_MATCH)
275:
276: TAILQ_FOREACH_REVERSE(m, list, member_list, entries) {
277: switch (m->type) {
278: case ALL:
279: matched = !m->negated;
280: break;
281: case NETGROUP:
282: if (netgr_matches(m->name, user_runhost, user_srunhost, NULL))
283: matched = !m->negated;
284: break;
285: case NTWKADDR:
286: if (addr_matches(m->name))
287: matched = !m->negated;
288: break;
289: case ALIAS:
290: if ((a = alias_get(m->name, HOSTALIAS)) != NULL) {
291: rval = hostlist_matches(&a->members);
292: if (rval != UNSPEC)
293: matched = m->negated ? !rval : rval;
294: alias_put(a);
295: break;
296: }
297: /* FALLTHROUGH */
298: case WORD:
299: if (hostname_matches(user_srunhost, user_runhost, m->name))
300: matched = !m->negated;
301: break;
302: }
303: if (matched != UNSPEC)
304: break;
305: }
306: debug_return_bool(matched);
307: }
308:
309: /*
310: * Check for cmnd and args in a list of members.
311: * Returns ALLOW, DENY or UNSPEC.
312: */
313: int
314: cmndlist_matches(const struct member_list *list)
315: {
316: struct member *m;
317: int matched = UNSPEC;
318: debug_decl(cmndlist_matches, SUDO_DEBUG_MATCH)
319:
320: TAILQ_FOREACH_REVERSE(m, list, member_list, entries) {
321: matched = cmnd_matches(m);
322: if (matched != UNSPEC)
323: break;
324: }
325: debug_return_bool(matched);
326: }
327:
328: /*
329: * Check cmnd and args.
330: * Returns ALLOW, DENY or UNSPEC.
331: */
332: int
333: cmnd_matches(const struct member *m)
334: {
335: struct alias *a;
336: struct sudo_command *c;
337: int rval, matched = UNSPEC;
338: debug_decl(cmnd_matches, SUDO_DEBUG_MATCH)
339:
340: switch (m->type) {
341: case ALL:
342: matched = !m->negated;
343: break;
344: case ALIAS:
345: if ((a = alias_get(m->name, CMNDALIAS)) != NULL) {
346: rval = cmndlist_matches(&a->members);
347: if (rval != UNSPEC)
348: matched = m->negated ? !rval : rval;
349: alias_put(a);
350: }
351: break;
352: case COMMAND:
353: c = (struct sudo_command *)m->name;
354: if (command_matches(c->cmnd, c->args, c->digest))
355: matched = !m->negated;
356: break;
357: }
358: debug_return_bool(matched);
359: }
360:
361: static bool
362: command_args_match(const char *sudoers_cmnd, const char *sudoers_args)
363: {
364: int flags = 0;
365: debug_decl(command_args_match, SUDO_DEBUG_MATCH)
366:
367: /*
368: * If no args specified in sudoers, any user args are allowed.
369: * If the empty string is specified in sudoers, no user args are allowed.
370: */
371: if (!sudoers_args ||
372: (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)))
373: debug_return_bool(true);
374: /*
375: * If args are specified in sudoers, they must match the user args.
376: * If running as sudoedit, all args are assumed to be paths.
377: */
378: if (sudoers_args) {
379: /* For sudoedit, all args are assumed to be pathnames. */
380: if (strcmp(sudoers_cmnd, "sudoedit") == 0)
381: flags = FNM_PATHNAME;
382: if (fnmatch(sudoers_args, user_args ? user_args : "", flags) == 0)
383: debug_return_bool(true);
384: }
385: debug_return_bool(false);
386: }
387:
388: /*
389: * If path doesn't end in /, return true iff cmnd & path name the same inode;
390: * otherwise, return true if user_cmnd names one of the inodes in path.
391: */
392: bool
393: command_matches(const char *sudoers_cmnd, const char *sudoers_args, const struct sudo_digest *digest)
394: {
395: bool rc = false;
396: debug_decl(command_matches, SUDO_DEBUG_MATCH)
397:
398: /* Check for pseudo-commands */
399: if (sudoers_cmnd[0] != '/') {
400: /*
401: * Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
402: * a) there are no args in sudoers OR
403: * b) there are no args on command line and none req by sudoers OR
404: * c) there are args in sudoers and on command line and they match
405: */
406: if (strcmp(sudoers_cmnd, "sudoedit") == 0 &&
407: strcmp(user_cmnd, "sudoedit") == 0 &&
408: command_args_match(sudoers_cmnd, sudoers_args)) {
409: efree(safe_cmnd);
410: safe_cmnd = estrdup(sudoers_cmnd);
411: rc = true;
412: }
413: goto done;
414: }
415:
416: if (has_meta(sudoers_cmnd)) {
417: /*
418: * If sudoers_cmnd has meta characters in it, we need to
419: * use glob(3) and/or fnmatch(3) to do the matching.
420: */
421: #ifdef SUDOERS_NAME_MATCH
422: rc = command_matches_fnmatch(sudoers_cmnd, sudoers_args);
423: #else
424: if (def_fast_glob)
425: rc = command_matches_fnmatch(sudoers_cmnd, sudoers_args);
426: else
427: rc = command_matches_glob(sudoers_cmnd, sudoers_args);
428: #endif
429: } else {
430: rc = command_matches_normal(sudoers_cmnd, sudoers_args, digest);
431: }
432: done:
433: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
434: "user command \"%s%s%s\" matches sudoers command \"%s%s%s\": %s",
435: user_cmnd, user_args ? " " : "", user_args ? user_args : "",
436: sudoers_cmnd, sudoers_args ? " " : "", sudoers_args ? sudoers_args : "",
437: rc ? "true" : "false");
438: debug_return_bool(rc);
439: }
440:
441: static bool
442: command_matches_fnmatch(const char *sudoers_cmnd, const char *sudoers_args)
443: {
444: debug_decl(command_matches_fnmatch, SUDO_DEBUG_MATCH)
445:
446: /*
447: * Return true if fnmatch(3) succeeds AND
448: * a) there are no args in sudoers OR
449: * b) there are no args on command line and none required by sudoers OR
450: * c) there are args in sudoers and on command line and they match
451: * else return false.
452: */
453: if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
454: debug_return_bool(false);
455: if (command_args_match(sudoers_cmnd, sudoers_args)) {
456: if (safe_cmnd)
457: free(safe_cmnd);
458: safe_cmnd = estrdup(user_cmnd);
459: debug_return_bool(true);
460: }
461: debug_return_bool(false);
462: }
463:
464: #ifndef SUDOERS_NAME_MATCH
465: static bool
466: command_matches_glob(const char *sudoers_cmnd, const char *sudoers_args)
467: {
468: struct stat sudoers_stat;
469: size_t dlen;
470: char **ap, *base, *cp;
471: glob_t gl;
472: debug_decl(command_matches_glob, SUDO_DEBUG_MATCH)
473:
474: /*
475: * First check to see if we can avoid the call to glob(3).
476: * Short circuit if there are no meta chars in the command itself
477: * and user_base and basename(sudoers_cmnd) don't match.
478: */
479: dlen = strlen(sudoers_cmnd);
480: if (sudoers_cmnd[dlen - 1] != '/') {
481: if ((base = strrchr(sudoers_cmnd, '/')) != NULL) {
482: base++;
483: if (!has_meta(base) && strcmp(user_base, base) != 0)
484: debug_return_bool(false);
485: }
486: }
487: /*
488: * Return true if we find a match in the glob(3) results AND
489: * a) there are no args in sudoers OR
490: * b) there are no args on command line and none required by sudoers OR
491: * c) there are args in sudoers and on command line and they match
492: * else return false.
493: */
494: if (glob(sudoers_cmnd, GLOB_NOSORT, NULL, &gl) != 0 || gl.gl_pathc == 0) {
495: globfree(&gl);
496: debug_return_bool(false);
497: }
498: /* For each glob match, compare basename, st_dev and st_ino. */
499: for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) {
500: /* If it ends in '/' it is a directory spec. */
501: dlen = strlen(cp);
502: if (cp[dlen - 1] == '/') {
503: if (command_matches_dir(cp, dlen))
504: debug_return_bool(true);
505: continue;
506: }
507:
508: /* Only proceed if user_base and basename(cp) match */
509: if ((base = strrchr(cp, '/')) != NULL)
510: base++;
511: else
512: base = cp;
513: if (strcmp(user_base, base) != 0 ||
514: stat(cp, &sudoers_stat) == -1)
515: continue;
516: if (user_stat == NULL ||
517: (user_stat->st_dev == sudoers_stat.st_dev &&
518: user_stat->st_ino == sudoers_stat.st_ino)) {
519: efree(safe_cmnd);
520: safe_cmnd = estrdup(cp);
521: break;
522: }
523: }
524: globfree(&gl);
525: if (cp == NULL)
526: debug_return_bool(false);
527:
528: if (command_args_match(sudoers_cmnd, sudoers_args)) {
529: efree(safe_cmnd);
530: safe_cmnd = estrdup(user_cmnd);
531: debug_return_bool(true);
532: }
533: debug_return_bool(false);
534: }
535: #endif /* SUDOERS_NAME_MATCH */
536:
537: #ifdef SUDOERS_NAME_MATCH
538: static bool
539: command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const struct sudo_digest *digest)
540: {
541: size_t dlen;
542: debug_decl(command_matches_normal, SUDO_DEBUG_MATCH)
543:
544: dlen = strlen(sudoers_cmnd);
545:
546: /* If it ends in '/' it is a directory spec. */
547: if (sudoers_cmnd[dlen - 1] == '/')
548: debug_return_bool(command_matches_dir(sudoers_cmnd, dlen));
549:
550: if (strcmp(user_cmnd, sudoers_cmnd) == 0) {
551: if (command_args_match(sudoers_cmnd, sudoers_args)) {
552: efree(safe_cmnd);
553: safe_cmnd = estrdup(sudoers_cmnd);
554: debug_return_bool(true);
555: }
556: }
557: debug_return_bool(false);
558: }
559: #else /* !SUDOERS_NAME_MATCH */
560:
561: static struct digest_function {
562: const char *digest_name;
563: const unsigned int digest_len;
564: void (*init)(SHA2_CTX *);
565: void (*update)(SHA2_CTX *, const unsigned char *, size_t);
566: void (*final)(unsigned char *, SHA2_CTX *);
567: } digest_functions[] = {
568: {
569: "SHA224",
570: SHA224_DIGEST_LENGTH,
571: SHA224Init,
572: SHA224Update,
573: SHA224Final
574: }, {
575: "SHA256",
576: SHA256_DIGEST_LENGTH,
577: SHA256Init,
578: SHA256Update,
579: SHA256Final
580: }, {
581: "SHA384",
582: SHA384_DIGEST_LENGTH,
583: SHA384Init,
584: SHA384Update,
585: SHA384Final
586: }, {
587: "SHA512",
588: SHA512_DIGEST_LENGTH,
589: SHA512Init,
590: SHA512Update,
591: SHA512Final
592: }, {
593: NULL
594: }
595: };
596:
597: static bool
598: digest_matches(const char *file, const struct sudo_digest *sd)
599: {
600: unsigned char file_digest[SHA512_DIGEST_LENGTH];
601: unsigned char sudoers_digest[SHA512_DIGEST_LENGTH];
602: unsigned char buf[32 * 1024];
603: struct digest_function *func = NULL;
604: size_t nread;
605: SHA2_CTX ctx;
606: FILE *fp;
607: unsigned int i;
608: debug_decl(digest_matches, SUDO_DEBUG_MATCH)
609:
610: for (i = 0; digest_functions[i].digest_name != NULL; i++) {
611: if (sd->digest_type == i) {
612: func = &digest_functions[i];
613: break;
614: }
615: }
616: if (func == NULL) {
617: warningx(U_("unsupported digest type %d for %s"), sd->digest_type, file);
618: debug_return_bool(false);
619: }
620: if (strlen(sd->digest_str) == func->digest_len * 2) {
621: /* Convert the command digest from ascii hex to binary. */
622: for (i = 0; i < func->digest_len; i++) {
623: if (!isxdigit((unsigned char)sd->digest_str[i + i]) ||
624: !isxdigit((unsigned char)sd->digest_str[i + i + 1])) {
625: goto bad_format;
626: }
627: sudoers_digest[i] = hexchar(&sd->digest_str[i + i]);
628: }
629: } else {
630: size_t len = base64_decode(sd->digest_str, sudoers_digest,
631: sizeof(sudoers_digest));
632: if (len != func->digest_len)
633: goto bad_format;
634: }
635:
636: if ((fp = fopen(file, "r")) == NULL) {
637: sudo_debug_printf(SUDO_DEBUG_INFO, "unable to open %s: %s",
638: file, strerror(errno));
639: debug_return_bool(false);
640: }
641:
642: func->init(&ctx);
643: while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
644: func->update(&ctx, buf, nread);
645: }
646: if (ferror(fp)) {
647: warningx(U_("%s: read error"), file);
648: fclose(fp);
649: debug_return_bool(false);
650: }
651: fclose(fp);
652: func->final(file_digest, &ctx);
653:
654: if (memcmp(file_digest, sudoers_digest, func->digest_len) == 0)
655: debug_return_bool(true);
656: sudo_debug_printf(SUDO_DEBUG_DIAG|SUDO_DEBUG_LINENO,
657: "%s digest mismatch for %s, expecting %s",
658: func->digest_name, file, sd->digest_str);
659: debug_return_bool(false);
660: bad_format:
661: warningx(U_("digest for %s (%s) is not in %s form"), file,
662: sd->digest_str, func->digest_name);
663: debug_return_bool(false);
664: }
665:
666: static bool
667: command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const struct sudo_digest *digest)
668: {
669: struct stat sudoers_stat;
670: const char *base;
671: size_t dlen;
672: debug_decl(command_matches_normal, SUDO_DEBUG_MATCH)
673:
674: /* If it ends in '/' it is a directory spec. */
675: dlen = strlen(sudoers_cmnd);
676: if (sudoers_cmnd[dlen - 1] == '/')
677: debug_return_bool(command_matches_dir(sudoers_cmnd, dlen));
678:
679: /* Only proceed if user_base and basename(sudoers_cmnd) match */
680: if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
681: base = sudoers_cmnd;
682: else
683: base++;
684: if (strcmp(user_base, base) != 0 ||
685: stat(sudoers_cmnd, &sudoers_stat) == -1)
686: debug_return_bool(false);
687:
688: /*
689: * Return true if inode/device matches AND
690: * a) there are no args in sudoers OR
691: * b) there are no args on command line and none req by sudoers OR
692: * c) there are args in sudoers and on command line and they match
693: * d) there is a digest and it matches
694: */
695: if (user_stat != NULL &&
696: (user_stat->st_dev != sudoers_stat.st_dev ||
697: user_stat->st_ino != sudoers_stat.st_ino))
698: debug_return_bool(false);
699: if (!command_args_match(sudoers_cmnd, sudoers_args))
700: debug_return_bool(false);
701: if (digest != NULL && !digest_matches(sudoers_cmnd, digest)) {
702: /* XXX - log functions not available but we should log very loudly */
703: debug_return_bool(false);
704: }
705: efree(safe_cmnd);
706: safe_cmnd = estrdup(sudoers_cmnd);
707: debug_return_bool(true);
708: }
709: #endif /* SUDOERS_NAME_MATCH */
710:
711: #ifdef SUDOERS_NAME_MATCH
712: /*
713: * Return true if user_cmnd begins with sudoers_dir, else false.
714: * Note that sudoers_dir include the trailing '/'
715: */
716: static bool
717: command_matches_dir(const char *sudoers_dir, size_t dlen)
718: {
719: debug_decl(command_matches_dir, SUDO_DEBUG_MATCH)
720: debug_return_bool(strncmp(user_cmnd, sudoers_dir, dlen) == 0);
721: }
722: #else /* !SUDOERS_NAME_MATCH */
723: /*
724: * Return true if user_cmnd names one of the inodes in dir, else false.
725: */
726: static bool
727: command_matches_dir(const char *sudoers_dir, size_t dlen)
728: {
729: struct stat sudoers_stat;
730: struct dirent *dent;
731: char buf[PATH_MAX];
732: DIR *dirp;
733: debug_decl(command_matches_dir, SUDO_DEBUG_MATCH)
734:
735: /*
736: * Grot through directory entries, looking for user_base.
737: */
738: dirp = opendir(sudoers_dir);
739: if (dirp == NULL)
740: debug_return_bool(false);
741:
742: if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
743: closedir(dirp);
744: debug_return_bool(false);
745: }
746: while ((dent = readdir(dirp)) != NULL) {
747: /* ignore paths > PATH_MAX (XXX - log) */
748: buf[dlen] = '\0';
749: if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
750: continue;
751:
752: /* only stat if basenames are the same */
753: if (strcmp(user_base, dent->d_name) != 0 ||
754: stat(buf, &sudoers_stat) == -1)
755: continue;
756: if (user_stat == NULL ||
757: (user_stat->st_dev == sudoers_stat.st_dev &&
758: user_stat->st_ino == sudoers_stat.st_ino)) {
759: efree(safe_cmnd);
760: safe_cmnd = estrdup(buf);
761: break;
762: }
763: }
764:
765: closedir(dirp);
766: debug_return_bool(dent != NULL);
767: }
768: #endif /* SUDOERS_NAME_MATCH */
769:
770: /*
771: * Returns true if the hostname matches the pattern, else false
772: */
773: bool
774: hostname_matches(const char *shost, const char *lhost, const char *pattern)
775: {
776: debug_decl(hostname_matches, SUDO_DEBUG_MATCH)
777: const char *host;
778: bool rc;
779:
780: host = strchr(pattern, '.') != NULL ? lhost : shost;
781: if (has_meta(pattern)) {
782: rc = !fnmatch(pattern, host, FNM_CASEFOLD);
783: } else {
784: rc = !strcasecmp(host, pattern);
785: }
786: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
787: "host %s matches sudoers pattern %s: %s",
788: host, pattern, rc ? "true" : "false");
789: debug_return_bool(rc);
790: }
791:
792: /*
793: * Returns true if the user/uid from sudoers matches the specified user/uid,
794: * else returns false.
795: */
796: bool
797: userpw_matches(const char *sudoers_user, const char *user, const struct passwd *pw)
798: {
799: const char *errstr;
800: uid_t uid;
801: bool rc;
802: debug_decl(userpw_matches, SUDO_DEBUG_MATCH)
803:
804: if (pw != NULL && *sudoers_user == '#') {
805: uid = (uid_t) atoid(sudoers_user + 1, NULL, NULL, &errstr);
806: if (errstr == NULL && uid == pw->pw_uid) {
807: rc = true;
808: goto done;
809: }
810: }
811: rc = strcmp(sudoers_user, user) == 0;
812: done:
813: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
814: "user %s matches sudoers user %s: %s",
815: user, sudoers_user, rc ? "true" : "false");
816: debug_return_bool(rc);
817: }
818:
819: /*
820: * Returns true if the group/gid from sudoers matches the specified group/gid,
821: * else returns false.
822: */
823: bool
824: group_matches(const char *sudoers_group, const struct group *gr)
825: {
826: const char *errstr;
827: gid_t gid;
828: bool rc;
829: debug_decl(group_matches, SUDO_DEBUG_MATCH)
830:
831: if (*sudoers_group == '#') {
832: gid = (gid_t) atoid(sudoers_group + 1, NULL, NULL, &errstr);
833: if (errstr == NULL && gid == gr->gr_gid) {
834: rc = true;
835: goto done;
836: }
837: }
838: rc = strcmp(gr->gr_name, sudoers_group) == 0;
839: done:
840: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
841: "group %s matches sudoers group %s: %s",
842: gr->gr_name, sudoers_group, rc ? "true" : "false");
843: debug_return_bool(rc);
844: }
845:
846: /*
847: * Returns true if the given user belongs to the named group,
848: * else returns false.
849: */
850: bool
851: usergr_matches(const char *group, const char *user, const struct passwd *pw)
852: {
853: int matched = false;
854: struct passwd *pw0 = NULL;
855: debug_decl(usergr_matches, SUDO_DEBUG_MATCH)
856:
857: /* make sure we have a valid usergroup, sudo style */
858: if (*group++ != '%') {
859: sudo_debug_printf(SUDO_DEBUG_DIAG, "user group %s has no leading '%%'",
860: group);
861: goto done;
862: }
863:
864: if (*group == ':' && def_group_plugin) {
865: matched = group_plugin_query(user, group + 1, pw);
866: goto done;
867: }
868:
869: /* look up user's primary gid in the passwd file */
870: if (pw == NULL) {
871: if ((pw0 = sudo_getpwnam(user)) == NULL) {
872: sudo_debug_printf(SUDO_DEBUG_DIAG, "unable to find %s in passwd db",
873: user);
874: goto done;
875: }
876: pw = pw0;
877: }
878:
879: if (user_in_group(pw, group)) {
880: matched = true;
881: goto done;
882: }
883:
884: /* not a Unix group, could be an external group */
885: if (def_group_plugin && group_plugin_query(user, group, pw)) {
886: matched = true;
887: goto done;
888: }
889:
890: done:
891: if (pw0 != NULL)
892: sudo_pw_delref(pw0);
893:
894: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
895: "user %s matches group %s: %s", user, group, matched ? "true" : "false");
896: debug_return_bool(matched);
897: }
898:
899: #ifdef HAVE_INNETGR
900: /*
901: * Get NIS-style domain name and return a malloc()ed copy or NULL if none.
902: */
903: static char *
904: sudo_getdomainname(void)
905: {
906: char *domain = NULL;
907: #ifdef HAVE_GETDOMAINNAME
908: char *buf, *cp;
909:
910: buf = emalloc(HOST_NAME_MAX + 1);
911: if (getdomainname(buf, HOST_NAME_MAX + 1) == 0 && *buf != '\0') {
912: domain = buf;
913: for (cp = buf; *cp != '\0'; cp++) {
914: /* Check for illegal characters, Linux may use "(none)". */
915: if (*cp == '(' || *cp == ')' || *cp == ',' || *cp == ' ') {
916: domain = NULL;
917: break;
918: }
919: }
920: }
921: if (domain == NULL)
922: efree(buf);
923: #endif /* HAVE_GETDOMAINNAME */
924: return domain;
925: }
926: #endif /* HAVE_INNETGR */
927:
928: /*
929: * Returns true if "host" and "user" belong to the netgroup "netgr",
930: * else return false. Either of "lhost", "shost" or "user" may be NULL
931: * in which case that argument is not checked...
932: */
933: bool
934: netgr_matches(const char *netgr, const char *lhost, const char *shost, const char *user)
935: {
936: #ifdef HAVE_INNETGR
937: static char *domain;
938: static int initialized;
939: #endif
940: bool rc = false;
941: debug_decl(netgr_matches, SUDO_DEBUG_MATCH)
942:
943: if (!def_use_netgroups) {
944: sudo_debug_printf(SUDO_DEBUG_INFO, "netgroups are disabled");
945: debug_return_bool(false);
946: }
947:
948: #ifdef HAVE_INNETGR
949: /* make sure we have a valid netgroup, sudo style */
950: if (*netgr++ != '+') {
951: sudo_debug_printf(SUDO_DEBUG_DIAG, "netgroup %s has no leading '+'",
952: netgr);
953: debug_return_bool(false);
954: }
955:
956: /* get the domain name (if any) */
957: if (!initialized) {
958: domain = sudo_getdomainname();
959: initialized = 1;
960: }
961:
962: if (innetgr(netgr, lhost, user, domain))
963: rc = true;
964: else if (lhost != shost && innetgr(netgr, shost, user, domain))
965: rc = true;
966: #endif /* HAVE_INNETGR */
967:
968: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
969: "netgroup %s matches (%s|%s, %s, %s): %s", netgr, lhost ? lhost : "",
970: shost ? shost : "", user ? user : "", domain ? domain : "",
971: rc ? "true" : "false");
972:
973: debug_return_bool(rc);
974: }
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