Annotation of embedaddon/sudo/plugins/sudoers/match.c, revision 1.1.1.5
1.1 misho 1: /*
1.1.1.4 misho 2: * Copyright (c) 1996, 1998-2005, 2007-2013
1.1 misho 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 */
1.1.1.4 misho 43: #if defined(HAVE_STDINT_H)
44: # include <stdint.h>
45: #elif defined(HAVE_INTTYPES_H)
46: # include <inttypes.h>
47: #endif
1.1 misho 48: #ifdef HAVE_UNISTD_H
49: # include <unistd.h>
50: #endif /* HAVE_UNISTD_H */
51: #ifdef HAVE_FNMATCH
52: # include <fnmatch.h>
1.1.1.4 misho 53: #else
54: # include "compat/fnmatch.h"
1.1 misho 55: #endif /* HAVE_FNMATCH */
1.1.1.4 misho 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 */
1.1 misho 63: #ifdef HAVE_NETGROUP_H
64: # include <netgroup.h>
1.1.1.4 misho 65: #else
66: # include <netdb.h>
1.1 misho 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
1.1.1.4 misho 84: #include <ctype.h>
85: #include <pwd.h>
86: #include <grp.h>
87: #include <errno.h>
1.1 misho 88:
89: #include "sudoers.h"
90: #include "parse.h"
1.1.1.4 misho 91: #include "sha2.h"
1.1 misho 92: #include <gram.h>
93:
94: static struct member_list empty;
95:
1.1.1.2 misho 96: static bool command_matches_dir(char *, size_t);
1.1.1.4 misho 97: #ifndef SUDOERS_NAME_MATCH
1.1.1.2 misho 98: static bool command_matches_glob(char *, char *);
1.1.1.4 misho 99: #endif
1.1.1.2 misho 100: static bool command_matches_fnmatch(char *, char *);
1.1.1.4 misho 101: static bool command_matches_normal(char *, char *, struct sudo_digest *);
1.1 misho 102:
103: /*
1.1.1.2 misho 104: * Returns true if string 's' contains meta characters.
1.1 misho 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: */
1.1.1.4 misho 112: int
113: userlist_matches(struct passwd *pw, struct member_list *list)
1.1 misho 114: {
115: struct member *m;
116: struct alias *a;
117: int rval, matched = UNSPEC;
1.1.1.4 misho 118: debug_decl(userlist_matches, SUDO_DEBUG_MATCH)
1.1 misho 119:
120: tq_foreach_rev(list, m) {
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:
1.1.1.4 misho 134: if ((a = alias_get(m->name, USERALIAS)) != NULL) {
135: rval = userlist_matches(pw, &a->members);
1.1 misho 136: if (rval != UNSPEC)
137: matched = m->negated ? !rval : rval;
1.1.1.4 misho 138: alias_put(a);
1.1 misho 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: }
1.1.1.2 misho 150: debug_return_bool(matched);
1.1 misho 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: */
1.1.1.4 misho 158: int
159: runaslist_matches(struct member_list *user_list,
1.1.1.3 misho 160: struct member_list *group_list, struct member **matching_user,
161: struct member **matching_group)
1.1 misho 162: {
163: struct member *m;
164: struct alias *a;
165: int rval;
166: int user_matched = UNSPEC;
167: int group_matched = UNSPEC;
1.1.1.4 misho 168: debug_decl(runaslist_matches, SUDO_DEBUG_MATCH)
1.1 misho 169:
170: if (runas_pw != NULL) {
171: /* If no runas user or runas group listed in sudoers, use default. */
172: if (tq_empty(user_list) && tq_empty(group_list))
1.1.1.2 misho 173: debug_return_int(userpw_matches(def_runas_default, runas_pw->pw_name, runas_pw));
1.1 misho 174:
175: tq_foreach_rev(user_list, m) {
176: switch (m->type) {
177: case ALL:
178: user_matched = !m->negated;
179: break;
180: case NETGROUP:
181: if (netgr_matches(m->name, NULL, NULL, runas_pw->pw_name))
182: user_matched = !m->negated;
183: break;
184: case USERGROUP:
185: if (usergr_matches(m->name, runas_pw->pw_name, runas_pw))
186: user_matched = !m->negated;
187: break;
188: case ALIAS:
1.1.1.4 misho 189: if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
190: rval = runaslist_matches(&a->members, &empty,
1.1.1.3 misho 191: matching_user, NULL);
1.1 misho 192: if (rval != UNSPEC)
193: user_matched = m->negated ? !rval : rval;
1.1.1.4 misho 194: alias_put(a);
1.1 misho 195: break;
196: }
197: /* FALLTHROUGH */
198: case WORD:
199: if (userpw_matches(m->name, runas_pw->pw_name, runas_pw))
200: user_matched = !m->negated;
201: break;
1.1.1.3 misho 202: case MYSELF:
203: if (!ISSET(sudo_user.flags, RUNAS_USER_SPECIFIED) ||
204: strcmp(user_name, runas_pw->pw_name) == 0)
205: user_matched = !m->negated;
206: break;
1.1 misho 207: }
1.1.1.3 misho 208: if (user_matched != UNSPEC) {
209: if (matching_user != NULL && m->type != ALIAS)
210: *matching_user = m;
1.1 misho 211: break;
1.1.1.3 misho 212: }
1.1 misho 213: }
214: }
215:
216: if (runas_gr != NULL) {
217: if (user_matched == UNSPEC) {
218: if (runas_pw == NULL || strcmp(runas_pw->pw_name, user_name) == 0)
219: user_matched = ALLOW; /* only changing group */
220: }
221: tq_foreach_rev(group_list, m) {
222: switch (m->type) {
223: case ALL:
224: group_matched = !m->negated;
225: break;
226: case ALIAS:
1.1.1.4 misho 227: if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
228: rval = runaslist_matches(&empty, &a->members,
1.1.1.3 misho 229: NULL, matching_group);
1.1 misho 230: if (rval != UNSPEC)
231: group_matched = m->negated ? !rval : rval;
1.1.1.4 misho 232: alias_put(a);
1.1 misho 233: break;
234: }
235: /* FALLTHROUGH */
236: case WORD:
237: if (group_matches(m->name, runas_gr))
238: group_matched = !m->negated;
239: break;
240: }
1.1.1.3 misho 241: if (group_matched != UNSPEC) {
242: if (matching_group != NULL && m->type != ALIAS)
243: *matching_group = m;
1.1 misho 244: break;
1.1.1.3 misho 245: }
1.1 misho 246: }
247: if (group_matched == UNSPEC) {
248: if (runas_pw != NULL && runas_pw->pw_gid == runas_gr->gr_gid)
249: group_matched = ALLOW; /* runas group matches passwd db */
250: }
251: }
252:
253: if (user_matched == DENY || group_matched == DENY)
1.1.1.2 misho 254: debug_return_int(DENY);
1.1 misho 255: if (user_matched == group_matched || runas_gr == NULL)
1.1.1.2 misho 256: debug_return_int(user_matched);
257: debug_return_int(UNSPEC);
1.1 misho 258: }
259:
260: /*
261: * Check for host and shost in a list of members.
262: * Returns ALLOW, DENY or UNSPEC.
263: */
1.1.1.4 misho 264: int
265: hostlist_matches(struct member_list *list)
1.1 misho 266: {
267: struct member *m;
268: struct alias *a;
269: int rval, matched = UNSPEC;
1.1.1.4 misho 270: debug_decl(hostlist_matches, SUDO_DEBUG_MATCH)
1.1 misho 271:
272: tq_foreach_rev(list, m) {
273: switch (m->type) {
274: case ALL:
275: matched = !m->negated;
276: break;
277: case NETGROUP:
1.1.1.5 ! misho 278: if (netgr_matches(m->name, user_runhost, user_srunhost, NULL))
1.1 misho 279: matched = !m->negated;
280: break;
281: case NTWKADDR:
282: if (addr_matches(m->name))
283: matched = !m->negated;
284: break;
285: case ALIAS:
1.1.1.4 misho 286: if ((a = alias_get(m->name, HOSTALIAS)) != NULL) {
287: rval = hostlist_matches(&a->members);
1.1 misho 288: if (rval != UNSPEC)
289: matched = m->negated ? !rval : rval;
1.1.1.4 misho 290: alias_put(a);
1.1 misho 291: break;
292: }
293: /* FALLTHROUGH */
294: case WORD:
1.1.1.5 ! misho 295: if (hostname_matches(user_srunhost, user_runhost, m->name))
1.1 misho 296: matched = !m->negated;
297: break;
298: }
299: if (matched != UNSPEC)
300: break;
301: }
1.1.1.2 misho 302: debug_return_bool(matched);
1.1 misho 303: }
304:
305: /*
306: * Check for cmnd and args in a list of members.
307: * Returns ALLOW, DENY or UNSPEC.
308: */
1.1.1.4 misho 309: int
310: cmndlist_matches(struct member_list *list)
1.1 misho 311: {
312: struct member *m;
313: int matched = UNSPEC;
1.1.1.4 misho 314: debug_decl(cmndlist_matches, SUDO_DEBUG_MATCH)
1.1 misho 315:
316: tq_foreach_rev(list, m) {
317: matched = cmnd_matches(m);
318: if (matched != UNSPEC)
319: break;
320: }
1.1.1.2 misho 321: debug_return_bool(matched);
1.1 misho 322: }
323:
324: /*
325: * Check cmnd and args.
326: * Returns ALLOW, DENY or UNSPEC.
327: */
328: int
329: cmnd_matches(struct member *m)
330: {
331: struct alias *a;
332: struct sudo_command *c;
333: int rval, matched = UNSPEC;
1.1.1.2 misho 334: debug_decl(cmnd_matches, SUDO_DEBUG_MATCH)
1.1 misho 335:
336: switch (m->type) {
337: case ALL:
338: matched = !m->negated;
339: break;
340: case ALIAS:
1.1.1.4 misho 341: if ((a = alias_get(m->name, CMNDALIAS)) != NULL) {
342: rval = cmndlist_matches(&a->members);
1.1 misho 343: if (rval != UNSPEC)
344: matched = m->negated ? !rval : rval;
1.1.1.4 misho 345: alias_put(a);
1.1 misho 346: }
347: break;
348: case COMMAND:
349: c = (struct sudo_command *)m->name;
1.1.1.4 misho 350: if (command_matches(c->cmnd, c->args, c->digest))
1.1 misho 351: matched = !m->negated;
352: break;
353: }
1.1.1.2 misho 354: debug_return_bool(matched);
1.1 misho 355: }
356:
1.1.1.2 misho 357: static bool
1.1.1.4 misho 358: command_args_match(char *sudoers_cmnd, char *sudoers_args)
1.1 misho 359: {
360: int flags = 0;
1.1.1.2 misho 361: debug_decl(command_args_match, SUDO_DEBUG_MATCH)
1.1 misho 362:
363: /*
364: * If no args specified in sudoers, any user args are allowed.
365: * If the empty string is specified in sudoers, no user args are allowed.
366: */
367: if (!sudoers_args ||
368: (!user_args && sudoers_args && !strcmp("\"\"", sudoers_args)))
1.1.1.2 misho 369: debug_return_bool(true);
1.1 misho 370: /*
371: * If args are specified in sudoers, they must match the user args.
372: * If running as sudoedit, all args are assumed to be paths.
373: */
374: if (sudoers_args) {
375: /* For sudoedit, all args are assumed to be pathnames. */
376: if (strcmp(sudoers_cmnd, "sudoedit") == 0)
377: flags = FNM_PATHNAME;
378: if (fnmatch(sudoers_args, user_args ? user_args : "", flags) == 0)
1.1.1.2 misho 379: debug_return_bool(true);
1.1 misho 380: }
1.1.1.2 misho 381: debug_return_bool(false);
1.1 misho 382: }
383:
384: /*
1.1.1.2 misho 385: * If path doesn't end in /, return true iff cmnd & path name the same inode;
386: * otherwise, return true if user_cmnd names one of the inodes in path.
1.1 misho 387: */
1.1.1.2 misho 388: bool
1.1.1.4 misho 389: command_matches(char *sudoers_cmnd, char *sudoers_args, struct sudo_digest *digest)
1.1 misho 390: {
1.1.1.2 misho 391: debug_decl(command_matches, SUDO_DEBUG_MATCH)
392:
1.1 misho 393: /* Check for pseudo-commands */
394: if (sudoers_cmnd[0] != '/') {
395: /*
396: * Return true if both sudoers_cmnd and user_cmnd are "sudoedit" AND
397: * a) there are no args in sudoers OR
398: * b) there are no args on command line and none req by sudoers OR
399: * c) there are args in sudoers and on command line and they match
400: */
401: if (strcmp(sudoers_cmnd, "sudoedit") != 0 ||
402: strcmp(user_cmnd, "sudoedit") != 0)
1.1.1.2 misho 403: debug_return_bool(false);
1.1 misho 404: if (command_args_match(sudoers_cmnd, sudoers_args)) {
405: efree(safe_cmnd);
406: safe_cmnd = estrdup(sudoers_cmnd);
1.1.1.2 misho 407: debug_return_bool(true);
1.1 misho 408: } else
1.1.1.2 misho 409: debug_return_bool(false);
1.1 misho 410: }
411:
412: if (has_meta(sudoers_cmnd)) {
413: /*
414: * If sudoers_cmnd has meta characters in it, we need to
415: * use glob(3) and/or fnmatch(3) to do the matching.
416: */
1.1.1.4 misho 417: #ifdef SUDOERS_NAME_MATCH
418: debug_return_bool(command_matches_fnmatch(sudoers_cmnd, sudoers_args));
419: #else
1.1 misho 420: if (def_fast_glob)
1.1.1.2 misho 421: debug_return_bool(command_matches_fnmatch(sudoers_cmnd, sudoers_args));
422: debug_return_bool(command_matches_glob(sudoers_cmnd, sudoers_args));
1.1.1.4 misho 423: #endif
1.1 misho 424: }
1.1.1.4 misho 425: debug_return_bool(command_matches_normal(sudoers_cmnd, sudoers_args, digest));
1.1 misho 426: }
427:
1.1.1.2 misho 428: static bool
1.1 misho 429: command_matches_fnmatch(char *sudoers_cmnd, char *sudoers_args)
430: {
1.1.1.2 misho 431: debug_decl(command_matches_fnmatch, SUDO_DEBUG_MATCH)
432:
1.1 misho 433: /*
434: * Return true if fnmatch(3) succeeds AND
435: * a) there are no args in sudoers OR
436: * b) there are no args on command line and none required by sudoers OR
437: * c) there are args in sudoers and on command line and they match
438: * else return false.
439: */
440: if (fnmatch(sudoers_cmnd, user_cmnd, FNM_PATHNAME) != 0)
1.1.1.2 misho 441: debug_return_bool(false);
1.1 misho 442: if (command_args_match(sudoers_cmnd, sudoers_args)) {
443: if (safe_cmnd)
444: free(safe_cmnd);
445: safe_cmnd = estrdup(user_cmnd);
1.1.1.2 misho 446: debug_return_bool(true);
447: }
448: debug_return_bool(false);
1.1 misho 449: }
450:
1.1.1.4 misho 451: #ifndef SUDOERS_NAME_MATCH
1.1.1.2 misho 452: static bool
1.1 misho 453: command_matches_glob(char *sudoers_cmnd, char *sudoers_args)
454: {
455: struct stat sudoers_stat;
456: size_t dlen;
457: char **ap, *base, *cp;
458: glob_t gl;
1.1.1.2 misho 459: debug_decl(command_matches_glob, SUDO_DEBUG_MATCH)
1.1 misho 460:
461: /*
462: * First check to see if we can avoid the call to glob(3).
463: * Short circuit if there are no meta chars in the command itself
464: * and user_base and basename(sudoers_cmnd) don't match.
465: */
466: dlen = strlen(sudoers_cmnd);
467: if (sudoers_cmnd[dlen - 1] != '/') {
468: if ((base = strrchr(sudoers_cmnd, '/')) != NULL) {
469: base++;
470: if (!has_meta(base) && strcmp(user_base, base) != 0)
1.1.1.2 misho 471: debug_return_bool(false);
1.1 misho 472: }
473: }
474: /*
475: * Return true if we find a match in the glob(3) results AND
476: * a) there are no args in sudoers OR
477: * b) there are no args on command line and none required by sudoers OR
478: * c) there are args in sudoers and on command line and they match
479: * else return false.
480: */
1.1.1.2 misho 481: if (glob(sudoers_cmnd, GLOB_NOSORT, NULL, &gl) != 0 || gl.gl_pathc == 0) {
1.1 misho 482: globfree(&gl);
1.1.1.2 misho 483: debug_return_bool(false);
1.1 misho 484: }
485: /* For each glob match, compare basename, st_dev and st_ino. */
486: for (ap = gl.gl_pathv; (cp = *ap) != NULL; ap++) {
487: /* If it ends in '/' it is a directory spec. */
488: dlen = strlen(cp);
489: if (cp[dlen - 1] == '/') {
490: if (command_matches_dir(cp, dlen))
1.1.1.2 misho 491: debug_return_bool(true);
1.1 misho 492: continue;
493: }
494:
495: /* Only proceed if user_base and basename(cp) match */
496: if ((base = strrchr(cp, '/')) != NULL)
497: base++;
498: else
499: base = cp;
500: if (strcmp(user_base, base) != 0 ||
501: stat(cp, &sudoers_stat) == -1)
502: continue;
503: if (user_stat == NULL ||
504: (user_stat->st_dev == sudoers_stat.st_dev &&
505: user_stat->st_ino == sudoers_stat.st_ino)) {
506: efree(safe_cmnd);
507: safe_cmnd = estrdup(cp);
508: break;
509: }
510: }
511: globfree(&gl);
512: if (cp == NULL)
1.1.1.2 misho 513: debug_return_bool(false);
1.1 misho 514:
515: if (command_args_match(sudoers_cmnd, sudoers_args)) {
516: efree(safe_cmnd);
517: safe_cmnd = estrdup(user_cmnd);
1.1.1.2 misho 518: debug_return_bool(true);
1.1 misho 519: }
1.1.1.2 misho 520: debug_return_bool(false);
1.1 misho 521: }
1.1.1.4 misho 522: #endif /* SUDOERS_NAME_MATCH */
1.1 misho 523:
1.1.1.4 misho 524: #ifdef SUDOERS_NAME_MATCH
1.1.1.2 misho 525: static bool
1.1.1.4 misho 526: command_matches_normal(char *sudoers_cmnd, char *sudoers_args, struct sudo_digest *digest)
527: {
528: size_t dlen;
529: debug_decl(command_matches_normal, SUDO_DEBUG_MATCH)
530:
531: dlen = strlen(sudoers_cmnd);
532:
533: /* If it ends in '/' it is a directory spec. */
534: if (sudoers_cmnd[dlen - 1] == '/')
535: debug_return_bool(command_matches_dir(sudoers_cmnd, dlen));
536:
537: if (strcmp(user_cmnd, sudoers_cmnd) == 0) {
538: if (command_args_match(sudoers_cmnd, sudoers_args)) {
539: efree(safe_cmnd);
540: safe_cmnd = estrdup(sudoers_cmnd);
541: debug_return_bool(true);
542: }
543: }
544: debug_return_bool(false);
545: }
546: #else /* !SUDOERS_NAME_MATCH */
547:
548: static struct digest_function {
549: const char *digest_name;
550: const unsigned int digest_len;
551: void (*init)(SHA2_CTX *);
552: void (*update)(SHA2_CTX *, const unsigned char *, size_t);
553: void (*final)(unsigned char *, SHA2_CTX *);
554: } digest_functions[] = {
555: {
556: "SHA224",
557: SHA224_DIGEST_LENGTH,
558: SHA224Init,
559: SHA224Update,
560: SHA224Final
561: }, {
562: "SHA256",
563: SHA256_DIGEST_LENGTH,
564: SHA256Init,
565: SHA256Update,
566: SHA256Final
567: }, {
568: "SHA384",
569: SHA384_DIGEST_LENGTH,
570: SHA384Init,
571: SHA384Update,
572: SHA384Final
573: }, {
574: "SHA512",
575: SHA512_DIGEST_LENGTH,
576: SHA512Init,
577: SHA512Update,
578: SHA512Final
579: }, {
580: NULL
581: }
582: };
583:
584: static bool
585: digest_matches(char *file, struct sudo_digest *sd)
586: {
587: unsigned char file_digest[SHA512_DIGEST_LENGTH];
588: unsigned char sudoers_digest[SHA512_DIGEST_LENGTH];
589: unsigned char buf[32 * 1024];
590: struct digest_function *func = NULL;
591: size_t nread;
592: SHA2_CTX ctx;
593: FILE *fp;
594: unsigned int i;
595: debug_decl(digest_matches, SUDO_DEBUG_MATCH)
596:
597: for (i = 0; digest_functions[i].digest_name != NULL; i++) {
598: if (sd->digest_type == i) {
599: func = &digest_functions[i];
600: break;
601: }
602: }
603: if (func == NULL) {
604: warningx(_("unsupported digest type %d for %s"), sd->digest_type, file);
605: debug_return_bool(false);
606: }
607: if (strlen(sd->digest_str) == func->digest_len * 2) {
608: /* Convert the command digest from ascii hex to binary. */
609: for (i = 0; i < func->digest_len; i++) {
610: if (!isxdigit((unsigned char)sd->digest_str[i + i]) ||
611: !isxdigit((unsigned char)sd->digest_str[i + i + 1])) {
612: goto bad_format;
613: }
614: sudoers_digest[i] = hexchar(&sd->digest_str[i + i]);
615: }
616: } else {
617: size_t len = base64_decode(sd->digest_str, sudoers_digest,
618: sizeof(sudoers_digest));
619: if (len != func->digest_len)
620: goto bad_format;
621: }
622:
623: if ((fp = fopen(file, "r")) == NULL) {
624: sudo_debug_printf(SUDO_DEBUG_INFO, "unable to open %s: %s",
625: file, strerror(errno));
626: debug_return_bool(false);
627: }
628:
629: func->init(&ctx);
630: while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
631: func->update(&ctx, buf, nread);
632: }
633: if (ferror(fp)) {
634: warningx(_("%s: read error"), file);
635: fclose(fp);
636: debug_return_bool(false);
637: }
638: fclose(fp);
639: func->final(file_digest, &ctx);
640:
641: debug_return_bool(memcmp(file_digest, sudoers_digest, func->digest_len) == 0);
642: bad_format:
643: warningx(_("digest for %s (%s) is not in %s form"), file,
644: sd->digest_str, func->digest_name);
645: debug_return_bool(false);
646: }
647:
648: static bool
649: command_matches_normal(char *sudoers_cmnd, char *sudoers_args, struct sudo_digest *digest)
1.1 misho 650: {
651: struct stat sudoers_stat;
652: char *base;
653: size_t dlen;
1.1.1.2 misho 654: debug_decl(command_matches_normal, SUDO_DEBUG_MATCH)
1.1 misho 655:
656: /* If it ends in '/' it is a directory spec. */
657: dlen = strlen(sudoers_cmnd);
658: if (sudoers_cmnd[dlen - 1] == '/')
1.1.1.2 misho 659: debug_return_bool(command_matches_dir(sudoers_cmnd, dlen));
1.1 misho 660:
661: /* Only proceed if user_base and basename(sudoers_cmnd) match */
662: if ((base = strrchr(sudoers_cmnd, '/')) == NULL)
663: base = sudoers_cmnd;
664: else
665: base++;
666: if (strcmp(user_base, base) != 0 ||
667: stat(sudoers_cmnd, &sudoers_stat) == -1)
1.1.1.2 misho 668: debug_return_bool(false);
1.1 misho 669:
670: /*
671: * Return true if inode/device matches AND
672: * a) there are no args in sudoers OR
673: * b) there are no args on command line and none req by sudoers OR
674: * c) there are args in sudoers and on command line and they match
1.1.1.4 misho 675: * d) there is a digest and it matches
1.1 misho 676: */
677: if (user_stat != NULL &&
678: (user_stat->st_dev != sudoers_stat.st_dev ||
679: user_stat->st_ino != sudoers_stat.st_ino))
1.1.1.2 misho 680: debug_return_bool(false);
1.1.1.4 misho 681: if (!command_args_match(sudoers_cmnd, sudoers_args))
682: debug_return_bool(false);
683: if (digest != NULL && !digest_matches(sudoers_cmnd, digest)) {
684: /* XXX - log functions not available but we should log very loudly */
685: debug_return_bool(false);
1.1 misho 686: }
1.1.1.4 misho 687: efree(safe_cmnd);
688: safe_cmnd = estrdup(sudoers_cmnd);
689: debug_return_bool(true);
1.1 misho 690: }
1.1.1.4 misho 691: #endif /* SUDOERS_NAME_MATCH */
1.1 misho 692:
1.1.1.4 misho 693: #ifdef SUDOERS_NAME_MATCH
694: /*
695: * Return true if user_cmnd begins with sudoers_dir, else false.
696: * Note that sudoers_dir include the trailing '/'
697: */
698: static bool
699: command_matches_dir(char *sudoers_dir, size_t dlen)
700: {
701: debug_decl(command_matches_dir, SUDO_DEBUG_MATCH)
702: debug_return_bool(strncmp(user_cmnd, sudoers_dir, dlen) == 0);
703: }
704: #else /* !SUDOERS_NAME_MATCH */
1.1 misho 705: /*
1.1.1.2 misho 706: * Return true if user_cmnd names one of the inodes in dir, else false.
1.1 misho 707: */
1.1.1.2 misho 708: static bool
1.1 misho 709: command_matches_dir(char *sudoers_dir, size_t dlen)
710: {
711: struct stat sudoers_stat;
712: struct dirent *dent;
713: char buf[PATH_MAX];
714: DIR *dirp;
1.1.1.2 misho 715: debug_decl(command_matches_dir, SUDO_DEBUG_MATCH)
1.1 misho 716:
717: /*
718: * Grot through directory entries, looking for user_base.
719: */
720: dirp = opendir(sudoers_dir);
721: if (dirp == NULL)
1.1.1.2 misho 722: debug_return_bool(false);
1.1 misho 723:
724: if (strlcpy(buf, sudoers_dir, sizeof(buf)) >= sizeof(buf)) {
725: closedir(dirp);
1.1.1.2 misho 726: debug_return_bool(false);
1.1 misho 727: }
728: while ((dent = readdir(dirp)) != NULL) {
729: /* ignore paths > PATH_MAX (XXX - log) */
730: buf[dlen] = '\0';
731: if (strlcat(buf, dent->d_name, sizeof(buf)) >= sizeof(buf))
732: continue;
733:
734: /* only stat if basenames are the same */
735: if (strcmp(user_base, dent->d_name) != 0 ||
736: stat(buf, &sudoers_stat) == -1)
737: continue;
738: if (user_stat == NULL ||
739: (user_stat->st_dev == sudoers_stat.st_dev &&
740: user_stat->st_ino == sudoers_stat.st_ino)) {
741: efree(safe_cmnd);
742: safe_cmnd = estrdup(buf);
743: break;
744: }
745: }
746:
747: closedir(dirp);
1.1.1.2 misho 748: debug_return_bool(dent != NULL);
1.1 misho 749: }
1.1.1.4 misho 750: #endif /* SUDOERS_NAME_MATCH */
1.1 misho 751:
752: /*
1.1.1.2 misho 753: * Returns true if the hostname matches the pattern, else false
1.1 misho 754: */
1.1.1.2 misho 755: bool
1.1 misho 756: hostname_matches(char *shost, char *lhost, char *pattern)
757: {
1.1.1.2 misho 758: debug_decl(hostname_matches, SUDO_DEBUG_MATCH)
759:
1.1 misho 760: if (has_meta(pattern)) {
761: if (strchr(pattern, '.'))
1.1.1.2 misho 762: debug_return_bool(!fnmatch(pattern, lhost, FNM_CASEFOLD));
1.1 misho 763: else
1.1.1.2 misho 764: debug_return_bool(!fnmatch(pattern, shost, FNM_CASEFOLD));
1.1 misho 765: } else {
766: if (strchr(pattern, '.'))
1.1.1.2 misho 767: debug_return_bool(!strcasecmp(lhost, pattern));
1.1 misho 768: else
1.1.1.2 misho 769: debug_return_bool(!strcasecmp(shost, pattern));
1.1 misho 770: }
771: }
772:
773: /*
1.1.1.2 misho 774: * Returns true if the user/uid from sudoers matches the specified user/uid,
775: * else returns false.
1.1 misho 776: */
1.1.1.2 misho 777: bool
1.1 misho 778: userpw_matches(char *sudoers_user, char *user, struct passwd *pw)
779: {
1.1.1.2 misho 780: debug_decl(userpw_matches, SUDO_DEBUG_MATCH)
781:
1.1 misho 782: if (pw != NULL && *sudoers_user == '#') {
783: uid_t uid = (uid_t) atoi(sudoers_user + 1);
784: if (uid == pw->pw_uid)
1.1.1.2 misho 785: debug_return_bool(true);
1.1 misho 786: }
1.1.1.2 misho 787: debug_return_bool(strcmp(sudoers_user, user) == 0);
1.1 misho 788: }
789:
790: /*
1.1.1.2 misho 791: * Returns true if the group/gid from sudoers matches the specified group/gid,
792: * else returns false.
1.1 misho 793: */
1.1.1.2 misho 794: bool
1.1 misho 795: group_matches(char *sudoers_group, struct group *gr)
796: {
1.1.1.2 misho 797: debug_decl(group_matches, SUDO_DEBUG_MATCH)
798:
1.1 misho 799: if (*sudoers_group == '#') {
800: gid_t gid = (gid_t) atoi(sudoers_group + 1);
801: if (gid == gr->gr_gid)
1.1.1.2 misho 802: debug_return_bool(true);
1.1 misho 803: }
1.1.1.2 misho 804: debug_return_bool(strcmp(gr->gr_name, sudoers_group) == 0);
1.1 misho 805: }
806:
807: /*
1.1.1.2 misho 808: * Returns true if the given user belongs to the named group,
809: * else returns false.
1.1 misho 810: */
1.1.1.2 misho 811: bool
1.1 misho 812: usergr_matches(char *group, char *user, struct passwd *pw)
813: {
1.1.1.2 misho 814: int matched = false;
1.1 misho 815: struct passwd *pw0 = NULL;
1.1.1.2 misho 816: debug_decl(usergr_matches, SUDO_DEBUG_MATCH)
1.1 misho 817:
818: /* make sure we have a valid usergroup, sudo style */
819: if (*group++ != '%')
820: goto done;
821:
822: if (*group == ':' && def_group_plugin) {
823: matched = group_plugin_query(user, group + 1, pw);
824: goto done;
825: }
826:
827: /* look up user's primary gid in the passwd file */
828: if (pw == NULL) {
829: if ((pw0 = sudo_getpwnam(user)) == NULL)
830: goto done;
831: pw = pw0;
832: }
833:
834: if (user_in_group(pw, group)) {
1.1.1.2 misho 835: matched = true;
1.1 misho 836: goto done;
837: }
838:
839: /* not a Unix group, could be an external group */
840: if (def_group_plugin && group_plugin_query(user, group, pw)) {
1.1.1.2 misho 841: matched = true;
1.1 misho 842: goto done;
843: }
844:
845: done:
846: if (pw0 != NULL)
1.1.1.3 misho 847: sudo_pw_delref(pw0);
1.1 misho 848:
1.1.1.2 misho 849: debug_return_bool(matched);
1.1 misho 850: }
851:
1.1.1.4 misho 852: #ifdef HAVE_INNETGR
853: /*
854: * Get NIS-style domain name and return a malloc()ed copy or NULL if none.
855: */
856: static char *
857: sudo_getdomainname(void)
858: {
859: char *domain = NULL;
860: #ifdef HAVE_GETDOMAINNAME
861: char *buf, *cp;
862:
863: buf = emalloc(HOST_NAME_MAX + 1);
864: if (getdomainname(buf, HOST_NAME_MAX + 1) == 0 && *buf != '\0') {
865: domain = buf;
866: for (cp = buf; *cp != '\0'; cp++) {
867: /* Check for illegal characters, Linux may use "(none)". */
868: if (*cp == '(' || *cp == ')' || *cp == ',' || *cp == ' ') {
869: domain = NULL;
870: break;
871: }
872: }
873: }
874: if (domain == NULL)
875: efree(buf);
876: #endif /* HAVE_GETDOMAINNAME */
877: return domain;
878: }
879: #endif /* HAVE_INNETGR */
880:
1.1 misho 881: /*
1.1.1.2 misho 882: * Returns true if "host" and "user" belong to the netgroup "netgr",
883: * else return false. Either of "host", "shost" or "user" may be NULL
1.1 misho 884: * in which case that argument is not checked...
885: *
886: * XXX - swap order of host & shost
887: */
1.1.1.2 misho 888: bool
1.1 misho 889: netgr_matches(char *netgr, char *lhost, char *shost, char *user)
890: {
1.1.1.4 misho 891: #ifdef HAVE_INNETGR
1.1 misho 892: static char *domain;
893: static int initialized;
894: #endif
1.1.1.2 misho 895: debug_decl(netgr_matches, SUDO_DEBUG_MATCH)
1.1 misho 896:
1.1.1.4 misho 897: #ifdef HAVE_INNETGR
1.1 misho 898: /* make sure we have a valid netgroup, sudo style */
899: if (*netgr++ != '+')
1.1.1.2 misho 900: debug_return_bool(false);
1.1 misho 901:
902: /* get the domain name (if any) */
903: if (!initialized) {
1.1.1.4 misho 904: domain = sudo_getdomainname();
1.1 misho 905: initialized = 1;
906: }
907:
908: if (innetgr(netgr, lhost, user, domain))
1.1.1.2 misho 909: debug_return_bool(true);
1.1 misho 910: else if (lhost != shost && innetgr(netgr, shost, user, domain))
1.1.1.2 misho 911: debug_return_bool(true);
1.1 misho 912: #endif /* HAVE_INNETGR */
913:
1.1.1.2 misho 914: debug_return_bool(false);
1.1 misho 915: }
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