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: #define _SUDO_MAIN
25:
26: #include <config.h>
27:
28: #include <sys/types.h>
29: #include <sys/stat.h>
30: #include <sys/socket.h>
31: #include <stdio.h>
32: #ifdef STDC_HEADERS
33: # include <stdlib.h>
34: # include <stddef.h>
35: #else
36: # ifdef HAVE_STDLIB_H
37: # include <stdlib.h>
38: # endif
39: #endif /* STDC_HEADERS */
40: #ifdef HAVE_STRING_H
41: # include <string.h>
42: #endif /* HAVE_STRING_H */
43: #ifdef HAVE_STRINGS_H
44: # include <strings.h>
45: #endif /* HAVE_STRINGS_H */
46: #ifdef HAVE_UNISTD_H
47: # include <unistd.h>
48: #endif /* HAVE_UNISTD_H */
49: #ifdef HAVE_FNMATCH
50: # include <fnmatch.h>
51: #else
52: # include "compat/fnmatch.h"
53: #endif /* HAVE_FNMATCH */
54: #ifdef HAVE_NETGROUP_H
55: # include <netgroup.h>
56: #endif /* HAVE_NETGROUP_H */
57: #include <ctype.h>
58: #include <errno.h>
59: #include <netinet/in.h>
60: #include <arpa/inet.h>
61:
62: #include "tsgetgrpw.h"
63: #include "sudoers.h"
64: #include "interfaces.h"
65: #include "parse.h"
66: #include "sudo_conf.h"
67: #include "secure_path.h"
68: #include <gram.h>
69:
70: /*
71: * Function Prototypes
72: */
73: int print_alias(void *, void *);
74: void dump_sudoers(void);
75: void print_defaults(void);
76: void print_privilege(struct privilege *);
77: void print_userspecs(void);
78: void usage(void) __attribute__((__noreturn__));
79: static void set_runaspw(const char *);
80: static void set_runasgr(const char *);
81: static int cb_runas_default(const char *);
82: static int testsudoers_print(const char *msg);
83:
84: extern void setgrfile(const char *);
85: extern void setgrent(void);
86: extern void endgrent(void);
87: extern struct group *getgrent(void);
88: extern struct group *getgrnam(const char *);
89: extern struct group *getgrgid(gid_t);
90: extern void setpwfile(const char *);
91: extern void setpwent(void);
92: extern void endpwent(void);
93: extern struct passwd *getpwent(void);
94: extern struct passwd *getpwnam(const char *);
95: extern struct passwd *getpwuid(uid_t);
96:
97: extern int (*trace_print)(const char *msg);
98:
99: /*
100: * Globals
101: */
102: struct sudo_user sudo_user;
103: struct passwd *list_pw;
104: static char *runas_group, *runas_user;
105: extern int errorlineno;
106: extern bool parse_error;
107: extern char *errorfile;
108:
109: /* For getopt(3) */
110: extern char *optarg;
111: extern int optind;
112:
113: #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
114: extern char *malloc_options;
115: #endif
116: #ifdef YYDEBUG
117: extern int sudoersdebug;
118: #endif
119:
120: __dso_public int main(int argc, char *argv[]);
121:
122: int
123: main(int argc, char *argv[])
124: {
125: struct cmndspec *cs;
126: struct privilege *priv;
127: struct userspec *us;
128: char *p, *grfile, *pwfile;
129: char hbuf[HOST_NAME_MAX + 1];
130: int match, host_match, runas_match, cmnd_match;
131: int ch, dflag, exitcode = 0;
132: debug_decl(main, SUDO_DEBUG_MAIN)
133:
134: #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
135: malloc_options = "AFGJPR";
136: #endif
137: #ifdef YYDEBUG
138: sudoersdebug = 1;
139: #endif
140:
141: #if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
142: setprogname(argc > 0 ? argv[0] : "testsudoers");
143: #endif
144:
145: sudoers_setlocale(SUDOERS_LOCALE_USER, NULL);
146: bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have own domain */
147: textdomain("sudoers");
148:
149: /* Read sudo.conf. */
150: sudo_conf_read(NULL);
151:
152: dflag = 0;
153: grfile = pwfile = NULL;
154: while ((ch = getopt(argc, argv, "dg:G:h:P:p:tu:U:")) != -1) {
155: switch (ch) {
156: case 'd':
157: dflag = 1;
158: break;
159: case 'h':
160: user_host = optarg;
161: break;
162: case 'G':
163: sudoers_gid = (gid_t)atoi(optarg);
164: break;
165: case 'g':
166: runas_group = optarg;
167: break;
168: case 'p':
169: pwfile = optarg;
170: break;
171: case 'P':
172: grfile = optarg;
173: break;
174: case 't':
175: trace_print = testsudoers_print;
176: break;
177: case 'U':
178: sudoers_uid = (uid_t)atoi(optarg);
179: break;
180: case 'u':
181: runas_user = optarg;
182: break;
183: default:
184: usage();
185: break;
186: }
187: }
188: argc -= optind;
189: argv += optind;
190:
191: /* Set group/passwd file and init the cache. */
192: if (grfile)
193: setgrfile(grfile);
194: if (pwfile)
195: setpwfile(pwfile);
196: sudo_setpwent();
197: sudo_setgrent();
198:
199: if (argc < 2) {
200: if (!dflag)
201: usage();
202: user_name = argc ? *argv++ : "root";
203: user_cmnd = user_base = "true";
204: argc = 0;
205: } else {
206: user_name = *argv++;
207: user_cmnd = *argv++;
208: if ((p = strrchr(user_cmnd, '/')) != NULL)
209: user_base = p + 1;
210: else
211: user_base = user_cmnd;
212: argc -= 2;
213: }
214: if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL)
215: fatalx(_("unknown user: %s"), user_name);
216:
217: if (user_host == NULL) {
218: if (gethostname(hbuf, sizeof(hbuf)) != 0)
219: fatal("gethostname");
220: hbuf[sizeof(hbuf) - 1] = '\0';
221: user_host = hbuf;
222: }
223: if ((p = strchr(user_host, '.'))) {
224: *p = '\0';
225: user_shost = estrdup(user_host);
226: *p = '.';
227: } else {
228: user_shost = user_host;
229: }
230: user_runhost = user_host;
231: user_srunhost = user_shost;
232:
233: /* Fill in user_args from argv. */
234: if (argc > 0) {
235: char *to, **from;
236: size_t size, n;
237:
238: for (size = 0, from = argv; *from; from++)
239: size += strlen(*from) + 1;
240:
241: user_args = (char *) emalloc(size);
242: for (to = user_args, from = argv; *from; from++) {
243: n = strlcpy(to, *from, size - (to - user_args));
244: if (n >= size - (to - user_args))
245: fatalx(_("internal error, %s overflow"), "init_vars()");
246: to += n;
247: *to++ = ' ';
248: }
249: *--to = '\0';
250: }
251:
252: /* Initialize default values. */
253: init_defaults();
254:
255: /* Set runas callback. */
256: sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
257:
258: /* Load ip addr/mask for each interface. */
259: if (get_net_ifs(&p) > 0)
260: set_interfaces(p);
261:
262: /* Allocate space for data structures in the parser. */
263: init_parser("sudoers", false);
264:
265: if (sudoersparse() != 0 || parse_error) {
266: parse_error = true;
267: if (errorlineno != -1)
268: (void) printf("Parse error in %s near line %d",
269: errorfile, errorlineno);
270: else
271: (void) printf("Parse error in %s", errorfile);
272: } else {
273: (void) fputs("Parses OK", stdout);
274: }
275:
276: if (!update_defaults(SETDEF_ALL))
277: (void) fputs(" (problem with defaults entries)", stdout);
278: puts(".");
279:
280: if (def_group_plugin && group_plugin_load(def_group_plugin) != true)
281: def_group_plugin = NULL;
282:
283: /*
284: * Set runas passwd/group entries based on command line or sudoers.
285: * Note that if runas_group was specified without runas_user we
286: * defer setting runas_pw so the match routines know to ignore it.
287: */
288: if (runas_group != NULL) {
289: set_runasgr(runas_group);
290: if (runas_user != NULL)
291: set_runaspw(runas_user);
292: } else
293: set_runaspw(runas_user ? runas_user : def_runas_default);
294:
295: if (dflag) {
296: (void) putchar('\n');
297: dump_sudoers();
298: if (argc < 2) {
299: exitcode = parse_error ? 1 : 0;
300: goto done;
301: }
302: }
303:
304: /* This loop must match the one in sudo_file_lookup() */
305: printf("\nEntries for user %s:\n", user_name);
306: match = UNSPEC;
307: tq_foreach_rev(&userspecs, us) {
308: if (userlist_matches(sudo_user.pw, &us->users) != ALLOW)
309: continue;
310: tq_foreach_rev(&us->privileges, priv) {
311: putchar('\n');
312: print_privilege(priv); /* XXX */
313: putchar('\n');
314: host_match = hostlist_matches(&priv->hostlist);
315: if (host_match == ALLOW) {
316: puts("\thost matched");
317: tq_foreach_rev(&priv->cmndlist, cs) {
318: runas_match = runaslist_matches(&cs->runasuserlist,
319: &cs->runasgrouplist, NULL, NULL);
320: if (runas_match == ALLOW) {
321: puts("\trunas matched");
322: cmnd_match = cmnd_matches(cs->cmnd);
323: if (cmnd_match != UNSPEC)
324: match = cmnd_match;
325: printf("\tcmnd %s\n", match == ALLOW ? "allowed" :
326: match == DENY ? "denied" : "unmatched");
327: }
328: }
329: } else
330: puts(_("\thost unmatched"));
331: }
332: }
333: puts(match == ALLOW ? _("\nCommand allowed") :
334: match == DENY ? _("\nCommand denied") : _("\nCommand unmatched"));
335:
336: /*
337: * Exit codes:
338: * 0 - parsed OK and command matched.
339: * 1 - parse error
340: * 2 - command not matched
341: * 3 - command denied
342: */
343: exitcode = parse_error ? 1 : (match == ALLOW ? 0 : match + 3);
344: done:
345: sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
346: exit(exitcode);
347: }
348:
349: static void
350: set_runaspw(const char *user)
351: {
352: debug_decl(main, SUDO_DEBUG_UTIL)
353:
354: if (runas_pw != NULL)
355: sudo_pw_delref(runas_pw);
356: if (*user == '#') {
357: if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
358: runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
359: } else {
360: if ((runas_pw = sudo_getpwnam(user)) == NULL)
361: fatalx(_("unknown user: %s"), user);
362: }
363:
364: debug_return;
365: }
366:
367: static void
368: set_runasgr(const char *group)
369: {
370: debug_decl(main, SUDO_DEBUG_UTIL)
371:
372: if (runas_gr != NULL)
373: sudo_gr_delref(runas_gr);
374: if (*group == '#') {
375: if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
376: runas_gr = sudo_fakegrnam(group);
377: } else {
378: if ((runas_gr = sudo_getgrnam(group)) == NULL)
379: fatalx(_("unknown group: %s"), group);
380: }
381:
382: debug_return;
383: }
384:
385: /*
386: * Callback for runas_default sudoers setting.
387: */
388: static int
389: cb_runas_default(const char *user)
390: {
391: /* Only reset runaspw if user didn't specify one. */
392: if (!runas_user && !runas_group)
393: set_runaspw(user);
394: return true;
395: }
396:
397: void
398: sudo_setspent(void)
399: {
400: return;
401: }
402:
403: void
404: sudo_endspent(void)
405: {
406: return;
407: }
408:
409: FILE *
410: open_sudoers(const char *sudoers, bool doedit, bool *keepopen)
411: {
412: struct stat sb;
413: FILE *fp = NULL;
414: char *sudoers_base;
415: debug_decl(open_sudoers, SUDO_DEBUG_UTIL)
416:
417: sudoers_base = strrchr(sudoers, '/');
418: if (sudoers_base != NULL)
419: sudoers_base++;
420:
421: switch (sudo_secure_file(sudoers, sudoers_uid, sudoers_gid, &sb)) {
422: case SUDO_PATH_SECURE:
423: fp = fopen(sudoers, "r");
424: break;
425: case SUDO_PATH_MISSING:
426: warning("unable to stat %s", sudoers_base);
427: break;
428: case SUDO_PATH_BAD_TYPE:
429: warningx("%s is not a regular file", sudoers_base);
430: break;
431: case SUDO_PATH_WRONG_OWNER:
432: warningx("%s should be owned by uid %u",
433: sudoers_base, (unsigned int) sudoers_uid);
434: break;
435: case SUDO_PATH_WORLD_WRITABLE:
436: warningx("%s is world writable", sudoers_base);
437: break;
438: case SUDO_PATH_GROUP_WRITABLE:
439: warningx("%s should be owned by gid %u",
440: sudoers_base, (unsigned int) sudoers_gid);
441: break;
442: default:
443: /* NOTREACHED */
444: break;
445: }
446:
447: debug_return_ptr(fp);
448: }
449:
450: void
451: init_envtables(void)
452: {
453: return;
454: }
455:
456: int
457: set_perms(int perm)
458: {
459: return 1;
460: }
461:
462: void
463: restore_perms(void)
464: {
465: }
466:
467: void
468: print_member(struct member *m)
469: {
470: struct sudo_command *c;
471: debug_decl(print_member, SUDO_DEBUG_UTIL)
472:
473: if (m->negated)
474: putchar('!');
475: if (m->name == NULL)
476: fputs("ALL", stdout);
477: else if (m->type != COMMAND)
478: fputs(m->name, stdout);
479: else {
480: c = (struct sudo_command *) m->name;
481: printf("%s%s%s", c->cmnd, c->args ? " " : "",
482: c->args ? c->args : "");
483: }
484:
485: debug_return;
486: }
487:
488: void
489: print_defaults(void)
490: {
491: struct defaults *d;
492: struct member *m;
493: debug_decl(print_member, SUDO_DEBUG_UTIL)
494:
495: tq_foreach_fwd(&defaults, d) {
496: (void) fputs("Defaults", stdout);
497: switch (d->type) {
498: case DEFAULTS_HOST:
499: putchar('@');
500: break;
501: case DEFAULTS_USER:
502: putchar(':');
503: break;
504: case DEFAULTS_RUNAS:
505: putchar('>');
506: break;
507: case DEFAULTS_CMND:
508: putchar('!');
509: break;
510: }
511: tq_foreach_fwd(&d->binding, m) {
512: if (m != tq_first(&d->binding))
513: putchar(',');
514: print_member(m);
515: }
516: printf("\t%s%s", d->op == false ? "!" : "", d->var);
517: if (d->val != NULL) {
518: printf("%c%s", d->op == true ? '=' : d->op, d->val);
519: }
520: putchar('\n');
521: }
522:
523: debug_return;
524: }
525:
526: int
527: print_alias(void *v1, void *v2)
528: {
529: struct alias *a = (struct alias *)v1;
530: struct member *m;
531: struct sudo_command *c;
532: debug_decl(print_alias, SUDO_DEBUG_UTIL)
533:
534: switch (a->type) {
535: case HOSTALIAS:
536: (void) printf("Host_Alias\t%s = ", a->name);
537: break;
538: case CMNDALIAS:
539: (void) printf("Cmnd_Alias\t%s = ", a->name);
540: break;
541: case USERALIAS:
542: (void) printf("User_Alias\t%s = ", a->name);
543: break;
544: case RUNASALIAS:
545: (void) printf("Runas_Alias\t%s = ", a->name);
546: break;
547: }
548: tq_foreach_fwd(&a->members, m) {
549: if (m != tq_first(&a->members))
550: fputs(", ", stdout);
551: if (m->type == COMMAND) {
552: c = (struct sudo_command *) m->name;
553: printf("%s%s%s", c->cmnd, c->args ? " " : "",
554: c->args ? c->args : "");
555: } else if (m->type == ALL) {
556: fputs("ALL", stdout);
557: } else {
558: fputs(m->name, stdout);
559: }
560: }
561: putchar('\n');
562: debug_return_int(0);
563: }
564:
565: void
566: print_privilege(struct privilege *priv)
567: {
568: struct cmndspec *cs;
569: struct member *m;
570: struct privilege *p;
571: struct cmndtag tags;
572: debug_decl(print_privilege, SUDO_DEBUG_UTIL)
573:
574: for (p = priv; p != NULL; p = p->next) {
575: if (p != priv)
576: fputs(" : ", stdout);
577: tq_foreach_fwd(&p->hostlist, m) {
578: if (m != tq_first(&p->hostlist))
579: fputs(", ", stdout);
580: print_member(m);
581: }
582: fputs(" = ", stdout);
583: tags.nopasswd = UNSPEC;
584: tags.noexec = UNSPEC;
585: tq_foreach_fwd(&p->cmndlist, cs) {
586: if (cs != tq_first(&p->cmndlist))
587: fputs(", ", stdout);
588: if (!tq_empty(&cs->runasuserlist) || !tq_empty(&cs->runasgrouplist)) {
589: fputs("(", stdout);
590: if (!tq_empty(&cs->runasuserlist)) {
591: tq_foreach_fwd(&cs->runasuserlist, m) {
592: if (m != tq_first(&cs->runasuserlist))
593: fputs(", ", stdout);
594: print_member(m);
595: }
596: } else if (tq_empty(&cs->runasgrouplist)) {
597: fputs(def_runas_default, stdout);
598: } else {
599: fputs(sudo_user.pw->pw_name, stdout);
600: }
601: if (!tq_empty(&cs->runasgrouplist)) {
602: fputs(" : ", stdout);
603: tq_foreach_fwd(&cs->runasgrouplist, m) {
604: if (m != tq_first(&cs->runasgrouplist))
605: fputs(", ", stdout);
606: print_member(m);
607: }
608: }
609: fputs(") ", stdout);
610: }
611: #ifdef HAVE_SELINUX
612: if (cs->role)
613: printf("ROLE=%s ", cs->role);
614: if (cs->type)
615: printf("TYPE=%s ", cs->type);
616: #endif /* HAVE_SELINUX */
617: #ifdef HAVE_PRIV_SET
618: if (cs->privs)
619: printf("PRIVS=%s ", cs->privs);
620: if (cs->limitprivs)
621: printf("LIMITPRIVS=%s ", cs->limitprivs);
622: #endif /* HAVE_PRIV_SET */
623: if (cs->tags.nopasswd != UNSPEC && cs->tags.nopasswd != tags.nopasswd)
624: printf("%sPASSWD: ", cs->tags.nopasswd ? "NO" : "");
625: if (cs->tags.noexec != UNSPEC && cs->tags.noexec != tags.noexec)
626: printf("%sEXEC: ", cs->tags.noexec ? "NO" : "");
627: print_member(cs->cmnd);
628: memcpy(&tags, &cs->tags, sizeof(tags));
629: }
630: }
631: debug_return;
632: }
633:
634: void
635: print_userspecs(void)
636: {
637: struct member *m;
638: struct userspec *us;
639: debug_decl(print_userspecs, SUDO_DEBUG_UTIL)
640:
641: tq_foreach_fwd(&userspecs, us) {
642: tq_foreach_fwd(&us->users, m) {
643: if (m != tq_first(&us->users))
644: fputs(", ", stdout);
645: print_member(m);
646: }
647: putchar('\t');
648: print_privilege(us->privileges.first); /* XXX */
649: putchar('\n');
650: }
651: debug_return;
652: }
653:
654: void
655: dump_sudoers(void)
656: {
657: debug_decl(dump_sudoers, SUDO_DEBUG_UTIL)
658:
659: print_defaults();
660:
661: putchar('\n');
662: alias_apply(print_alias, NULL);
663:
664: putchar('\n');
665: print_userspecs();
666:
667: debug_return;
668: }
669:
670: static int testsudoers_print(const char *msg)
671: {
672: return fputs(msg, stderr);
673: }
674:
675: void
676: usage(void)
677: {
678: (void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-p grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname());
679: exit(1);
680: }
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