Annotation of embedaddon/sudo/plugins/sudoers/visudo.c, revision 1.1.1.3
1.1 misho 1: /*
1.1.1.2 misho 2: * Copyright (c) 1996, 1998-2005, 2007-2012
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: *
17: * Sponsored in part by the Defense Advanced Research Projects
18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20: */
21:
22: /*
23: * Lock the sudoers file for safe editing (ala vipw) and check for parse errors.
24: */
25:
26: #define _SUDO_MAIN
27:
28: #ifdef __TANDEM
29: # include <floss.h>
30: #endif
31:
32: #include <config.h>
33:
34: #include <sys/types.h>
35: #include <sys/param.h>
36: #include <sys/stat.h>
37: #include <sys/socket.h>
38: #include <sys/time.h>
39: #ifndef __TANDEM
40: # include <sys/file.h>
41: #endif
42: #include <sys/wait.h>
43: #include <stdio.h>
44: #ifdef STDC_HEADERS
45: # include <stdlib.h>
46: # include <stddef.h>
47: #else
48: # ifdef HAVE_STDLIB_H
49: # include <stdlib.h>
50: # endif
51: #endif /* STDC_HEADERS */
52: #ifdef HAVE_STRING_H
53: # include <string.h>
54: #endif /* HAVE_STRING_H */
55: #ifdef HAVE_STRINGS_H
56: # include <strings.h>
57: #endif /* HAVE_STRINGS_H */
58: #ifdef HAVE_UNISTD_H
59: #include <unistd.h>
60: #endif /* HAVE_UNISTD_H */
61: #include <stdarg.h>
62: #include <ctype.h>
63: #include <pwd.h>
64: #include <grp.h>
65: #include <signal.h>
66: #include <errno.h>
67: #include <fcntl.h>
68: #include <netinet/in.h>
69: #include <arpa/inet.h>
70: #include <netdb.h>
71: #if TIME_WITH_SYS_TIME
72: # include <time.h>
73: #endif
74: #ifdef HAVE_SETLOCALE
75: # include <locale.h>
76: #endif
77:
78: #include "sudoers.h"
79: #include "interfaces.h"
80: #include "parse.h"
81: #include "redblack.h"
82: #include "gettext.h"
83: #include "sudoers_version.h"
1.1.1.2 misho 84: #include "sudo_conf.h"
1.1 misho 85: #include <gram.h>
86:
87: struct sudoersfile {
88: struct sudoersfile *prev, *next;
89: char *path;
90: char *tpath;
91: int fd;
92: int modified;
93: int doedit;
94: };
95: TQ_DECLARE(sudoersfile)
96:
1.1.1.2 misho 97: sudo_conv_t sudo_conv; /* NULL in non-plugin */
98:
1.1 misho 99: /*
100: * Function prototypes
101: */
102: static void quit(int);
103: static char *get_args(char *);
104: static char *get_editor(char **);
105: static void get_hostname(void);
1.1.1.2 misho 106: static int whatnow(void);
107: static int check_aliases(bool, bool);
108: static bool check_syntax(char *, bool, bool, bool);
109: static bool edit_sudoers(struct sudoersfile *, char *, char *, int);
110: static bool install_sudoers(struct sudoersfile *, bool);
1.1 misho 111: static int print_unused(void *, void *);
1.1.1.2 misho 112: static void reparse_sudoers(char *, char *, bool, bool);
1.1 misho 113: static int run_command(char *, char **);
114: static int visudo_printf(int msg_type, const char *fmt, ...);
115: static void setup_signals(void);
116: static void help(void) __attribute__((__noreturn__));
117: static void usage(int);
118:
119: void cleanup(int);
120:
121: extern void yyerror(const char *);
122: extern void yyrestart(FILE *);
123:
124: /*
125: * External globals exported by the parser
126: */
127: extern struct rbtree *aliases;
128: extern FILE *yyin;
129: extern char *sudoers, *errorfile;
1.1.1.2 misho 130: extern int errorlineno;
131: extern bool parse_error;
1.1 misho 132: /* For getopt(3) */
133: extern char *optarg;
134: extern int optind;
135:
136: /*
137: * Globals
138: */
139: struct interface *interfaces;
140: struct sudo_user sudo_user;
141: struct passwd *list_pw;
142: sudo_printf_t sudo_printf = visudo_printf;
143: static struct sudoersfile_list sudoerslist;
144: static struct rbtree *alias_freelist;
1.1.1.2 misho 145: static bool checkonly;
1.1 misho 146:
147: int
148: main(int argc, char *argv[])
149: {
150: struct sudoersfile *sp;
151: char *args, *editor, *sudoers_path;
1.1.1.2 misho 152: int ch, exitcode = 0;
153: bool quiet, strict, oldperms;
154: debug_decl(main, SUDO_DEBUG_MAIN)
155:
1.1 misho 156: #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
1.1.1.2 misho 157: {
158: extern char *malloc_options;
159: malloc_options = "AFGJPR";
160: }
1.1 misho 161: #endif
162:
163: #if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME)
164: setprogname(argc > 0 ? argv[0] : "visudo");
165: #endif
166:
167: #ifdef HAVE_SETLOCALE
168: setlocale(LC_ALL, "");
169: #endif
170: bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have visudo domain */
171: textdomain("sudoers");
172:
173: if (argc < 1)
174: usage(1);
175:
1.1.1.2 misho 176: /* Read sudo.conf. */
177: sudo_conf_read();
178:
1.1 misho 179: /*
180: * Arg handling.
181: */
1.1.1.2 misho 182: checkonly = oldperms = quiet = strict = false;
1.1 misho 183: sudoers_path = _PATH_SUDOERS;
184: while ((ch = getopt(argc, argv, "Vcf:sq")) != -1) {
185: switch (ch) {
186: case 'V':
187: (void) printf(_("%s version %s\n"), getprogname(), PACKAGE_VERSION);
188: (void) printf(_("%s grammar version %d\n"), getprogname(), SUDOERS_GRAMMAR_VERSION);
1.1.1.2 misho 189: goto done;
1.1 misho 190: case 'c':
1.1.1.3 ! misho 191: checkonly = true; /* check mode */
1.1 misho 192: break;
193: case 'f':
194: sudoers_path = optarg; /* sudoers file path */
1.1.1.2 misho 195: oldperms = true;
1.1 misho 196: break;
197: case 'h':
198: help();
199: break;
200: case 's':
1.1.1.3 ! misho 201: strict = true; /* strict mode */
1.1 misho 202: break;
203: case 'q':
1.1.1.3 ! misho 204: quiet = false; /* quiet mode */
1.1 misho 205: break;
206: default:
207: usage(1);
208: }
209: }
1.1.1.2 misho 210: /* There should be no other command line arguments. */
211: if (argc - optind != 0)
1.1 misho 212: usage(1);
213:
214: sudo_setpwent();
215: sudo_setgrent();
216:
217: /* Mock up a fake sudo_user struct. */
218: user_cmnd = "";
219: if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL)
220: errorx(1, _("you do not exist in the %s database"), "passwd");
221: get_hostname();
222:
223: /* Setup defaults data structures. */
224: init_defaults();
225:
1.1.1.2 misho 226: if (checkonly) {
227: exitcode = check_syntax(sudoers_path, quiet, strict, oldperms) ? 0 : 1;
228: goto done;
229: }
1.1 misho 230:
231: /*
232: * Parse the existing sudoers file(s) in quiet mode to highlight any
233: * existing errors and to pull in editor and env_editor conf values.
234: */
1.1.1.2 misho 235: if ((yyin = open_sudoers(sudoers_path, true, NULL)) == NULL) {
1.1 misho 236: error(1, "%s", sudoers_path);
237: }
1.1.1.3 ! misho 238: init_parser(sudoers_path, false);
1.1 misho 239: yyparse();
240: (void) update_defaults(SETDEF_GENERIC|SETDEF_HOST|SETDEF_USER);
241:
242: editor = get_editor(&args);
243:
244: /* Install signal handlers to clean up temp files if we are killed. */
245: setup_signals();
246:
247: /* Edit the sudoers file(s) */
248: tq_foreach_fwd(&sudoerslist, sp) {
249: if (!sp->doedit)
250: continue;
251: if (sp != tq_first(&sudoerslist)) {
252: printf(_("press return to edit %s: "), sp->path);
253: while ((ch = getchar()) != EOF && ch != '\n')
254: continue;
255: }
256: edit_sudoers(sp, editor, args, -1);
257: }
258:
259: /* Check edited files for a parse error and re-edit any that fail. */
260: reparse_sudoers(editor, args, strict, quiet);
261:
1.1.1.2 misho 262: /* Install the sudoers temp files as needed. */
1.1 misho 263: tq_foreach_fwd(&sudoerslist, sp) {
1.1.1.2 misho 264: (void) install_sudoers(sp, oldperms);
1.1 misho 265: }
266:
1.1.1.2 misho 267: done:
268: sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
269: exit(exitcode);
1.1 misho 270: }
271:
272: /*
273: * List of editors that support the "+lineno" command line syntax.
274: * If an entry starts with '*' the tail end of the string is matched.
275: * No other wild cards are supported.
276: */
277: static char *lineno_editors[] = {
278: "ex",
279: "nex",
280: "vi",
281: "nvi",
282: "vim",
283: "elvis",
284: "*macs",
285: "mg",
286: "vile",
287: "jove",
288: "pico",
289: "nano",
290: "ee",
291: "joe",
292: "zile",
293: NULL
294: };
295:
296: /*
297: * Edit each sudoers file.
1.1.1.2 misho 298: * Returns true on success, else false.
1.1 misho 299: */
1.1.1.2 misho 300: static bool
1.1 misho 301: edit_sudoers(struct sudoersfile *sp, char *editor, char *args, int lineno)
302: {
303: int tfd; /* sudoers temp file descriptor */
1.1.1.2 misho 304: bool modified; /* was the file modified? */
1.1 misho 305: int ac; /* argument count */
306: char **av; /* argument vector for run_command */
307: char *cp; /* scratch char pointer */
308: char buf[PATH_MAX*2]; /* buffer used for copying files */
309: char linestr[64]; /* string version of lineno */
310: struct timeval tv, tv1, tv2; /* time before and after edit */
311: struct timeval orig_mtim; /* starting mtime of sudoers file */
312: off_t orig_size; /* starting size of sudoers file */
313: ssize_t nread; /* number of bytes read */
314: struct stat sb; /* stat buffer */
1.1.1.2 misho 315: bool rval = false; /* return value */
316: debug_decl(edit_sudoers, SUDO_DEBUG_UTIL)
1.1 misho 317:
318: if (fstat(sp->fd, &sb) == -1)
319: error(1, _("unable to stat %s"), sp->path);
320: orig_size = sb.st_size;
321: mtim_get(&sb, &orig_mtim);
322:
323: /* Create the temp file if needed and set timestamp. */
324: if (sp->tpath == NULL) {
325: easprintf(&sp->tpath, "%s.tmp", sp->path);
326: tfd = open(sp->tpath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
327: if (tfd < 0)
328: error(1, "%s", sp->tpath);
329:
330: /* Copy sp->path -> sp->tpath and reset the mtime. */
331: if (orig_size != 0) {
332: (void) lseek(sp->fd, (off_t)0, SEEK_SET);
333: while ((nread = read(sp->fd, buf, sizeof(buf))) > 0)
334: if (write(tfd, buf, nread) != nread)
335: error(1, _("write error"));
336:
337: /* Add missing newline at EOF if needed. */
338: if (nread > 0 && buf[nread - 1] != '\n') {
339: buf[0] = '\n';
340: if (write(tfd, buf, 1) != 1)
341: error(1, _("write error"));
342: }
343: }
344: (void) close(tfd);
345: }
346: (void) touch(-1, sp->tpath, &orig_mtim);
347:
348: /* Does the editor support +lineno? */
349: if (lineno > 0)
350: {
351: char *editor_base = strrchr(editor, '/');
352: if (editor_base != NULL)
353: editor_base++;
354: else
355: editor_base = editor;
356: if (*editor_base == 'r')
357: editor_base++;
358:
359: for (av = lineno_editors; (cp = *av) != NULL; av++) {
360: /* We only handle a leading '*' wildcard. */
361: if (*cp == '*') {
362: size_t blen = strlen(editor_base);
363: size_t clen = strlen(++cp);
364: if (blen >= clen) {
365: if (strcmp(cp, editor_base + blen - clen) == 0)
366: break;
367: }
368: } else if (strcmp(cp, editor_base) == 0)
369: break;
370: }
371: /* Disable +lineno if editor doesn't support it. */
372: if (cp == NULL)
373: lineno = -1;
374: }
375:
376: /* Find the length of the argument vector */
377: ac = 3 + (lineno > 0);
378: if (args) {
1.1.1.2 misho 379: bool wasblank;
1.1 misho 380:
381: ac++;
1.1.1.2 misho 382: for (wasblank = false, cp = args; *cp; cp++) {
1.1 misho 383: if (isblank((unsigned char) *cp))
1.1.1.2 misho 384: wasblank = true;
1.1 misho 385: else if (wasblank) {
1.1.1.2 misho 386: wasblank = false;
1.1 misho 387: ac++;
388: }
389: }
390: }
391:
392: /* Build up argument vector for the command */
393: av = emalloc2(ac, sizeof(char *));
394: if ((av[0] = strrchr(editor, '/')) != NULL)
395: av[0]++;
396: else
397: av[0] = editor;
398: ac = 1;
399: if (lineno > 0) {
400: (void) snprintf(linestr, sizeof(linestr), "+%d", lineno);
401: av[ac++] = linestr;
402: }
403: if (args) {
404: for ((cp = strtok(args, " \t")); cp; (cp = strtok(NULL, " \t")))
405: av[ac++] = cp;
406: }
407: av[ac++] = sp->tpath;
408: av[ac++] = NULL;
409:
410: /*
411: * Do the edit:
412: * We cannot check the editor's exit value against 0 since
413: * XPG4 specifies that vi's exit value is a function of the
414: * number of errors during editing (?!?!).
415: */
416: gettimeofday(&tv1, NULL);
417: if (run_command(editor, av) != -1) {
418: gettimeofday(&tv2, NULL);
419: /*
420: * Sanity checks.
421: */
422: if (stat(sp->tpath, &sb) < 0) {
423: warningx(_("unable to stat temporary file (%s), %s unchanged"),
424: sp->tpath, sp->path);
1.1.1.2 misho 425: goto done;
1.1 misho 426: }
427: if (sb.st_size == 0 && orig_size != 0) {
428: warningx(_("zero length temporary file (%s), %s unchanged"),
429: sp->tpath, sp->path);
1.1.1.2 misho 430: sp->modified = true;
431: goto done;
1.1 misho 432: }
433: } else {
434: warningx(_("editor (%s) failed, %s unchanged"), editor, sp->path);
1.1.1.2 misho 435: goto done;
1.1 misho 436: }
437:
438: /* Set modified bit if use changed the file. */
1.1.1.2 misho 439: modified = true;
1.1 misho 440: mtim_get(&sb, &tv);
441: if (orig_size == sb.st_size && timevalcmp(&orig_mtim, &tv, ==)) {
442: /*
443: * If mtime and size match but the user spent no measurable
444: * time in the editor we can't tell if the file was changed.
445: */
446: timevalsub(&tv1, &tv2);
447: if (timevalisset(&tv2))
1.1.1.2 misho 448: modified = false;
1.1 misho 449: }
450:
451: /*
452: * If modified in this edit session, mark as modified.
453: */
454: if (modified)
455: sp->modified = modified;
456: else
457: warningx(_("%s unchanged"), sp->tpath);
458:
1.1.1.2 misho 459: rval = true;
460: done:
461: debug_return_bool(rval);
1.1 misho 462: }
463:
464: /*
465: * Parse sudoers after editing and re-edit any ones that caused a parse error.
466: */
1.1.1.2 misho 467: static void
468: reparse_sudoers(char *editor, char *args, bool strict, bool quiet)
1.1 misho 469: {
470: struct sudoersfile *sp, *last;
471: FILE *fp;
472: int ch;
1.1.1.2 misho 473: debug_decl(reparse_sudoers, SUDO_DEBUG_UTIL)
1.1 misho 474:
1.1.1.3 ! misho 475: if (tq_empty(&sudoerslist))
! 476: debug_return;
! 477:
1.1 misho 478: /*
479: * Parse the edited sudoers files and do sanity checking
480: */
481: do {
482: sp = tq_first(&sudoerslist);
483: last = tq_last(&sudoerslist);
484: fp = fopen(sp->tpath, "r+");
485: if (fp == NULL)
486: errorx(1, _("unable to re-open temporary file (%s), %s unchanged."),
487: sp->tpath, sp->path);
488:
489: /* Clean slate for each parse */
490: init_defaults();
491: init_parser(sp->path, quiet);
492:
493: /* Parse the sudoers temp file */
494: yyrestart(fp);
495: if (yyparse() && !parse_error) {
496: warningx(_("unabled to parse temporary file (%s), unknown error"),
497: sp->tpath);
1.1.1.2 misho 498: parse_error = true;
1.1 misho 499: errorfile = sp->path;
500: }
501: fclose(yyin);
502: if (!parse_error) {
1.1.1.3 ! misho 503: if (!check_defaults(SETDEF_ALL, quiet) ||
1.1 misho 504: check_aliases(strict, quiet) != 0) {
1.1.1.2 misho 505: parse_error = true;
1.1.1.3 ! misho 506: errorfile = NULL;
1.1 misho 507: }
508: }
509:
510: /*
511: * Got an error, prompt the user for what to do now
512: */
513: if (parse_error) {
514: switch (whatnow()) {
1.1.1.2 misho 515: case 'Q' : parse_error = false; /* ignore parse error */
1.1 misho 516: break;
1.1.1.2 misho 517: case 'x' : /* XXX - should return instead of exiting */
518: cleanup(0);
519: sudo_debug_exit_int(__func__, __FILE__,
520: __LINE__, sudo_debug_subsys, 0);
1.1 misho 521: exit(0);
522: break;
523: }
524: }
525: if (parse_error) {
526: /* Edit file with the parse error */
527: tq_foreach_fwd(&sudoerslist, sp) {
528: if (errorfile == NULL || strcmp(sp->path, errorfile) == 0) {
529: edit_sudoers(sp, editor, args, errorlineno);
1.1.1.3 ! misho 530: if (errorfile != NULL)
! 531: break;
1.1 misho 532: }
533: }
1.1.1.3 ! misho 534: if (errorfile != NULL && sp == NULL) {
1.1 misho 535: errorx(1, _("internal error, unable to find %s in list!"),
536: sudoers);
537: }
538: }
539:
540: /* If any new #include directives were added, edit them too. */
541: for (sp = last->next; sp != NULL; sp = sp->next) {
542: printf(_("press return to edit %s: "), sp->path);
543: while ((ch = getchar()) != EOF && ch != '\n')
544: continue;
545: edit_sudoers(sp, editor, args, errorlineno);
546: }
547: } while (parse_error);
548:
1.1.1.2 misho 549: debug_return;
1.1 misho 550: }
551:
552: /*
553: * Set the owner and mode on a sudoers temp file and
1.1.1.2 misho 554: * move it into place. Returns true on success, else false.
1.1 misho 555: */
1.1.1.2 misho 556: static bool
557: install_sudoers(struct sudoersfile *sp, bool oldperms)
1.1 misho 558: {
559: struct stat sb;
1.1.1.2 misho 560: bool rval = false;
561: debug_decl(install_sudoers, SUDO_DEBUG_UTIL)
562:
563: if (!sp->modified) {
564: /*
565: * No changes but fix owner/mode if needed.
566: */
567: (void) unlink(sp->tpath);
568: if (!oldperms && fstat(sp->fd, &sb) != -1) {
569: if (sb.st_uid != SUDOERS_UID || sb.st_gid != SUDOERS_GID)
570: ignore_result(chown(sp->path, SUDOERS_UID, SUDOERS_GID));
571: if ((sb.st_mode & 0777) != SUDOERS_MODE)
572: ignore_result(chmod(sp->path, SUDOERS_MODE));
573: }
574: rval = true;
575: goto done;
576: }
1.1 misho 577:
578: /*
579: * Change mode and ownership of temp file so when
580: * we move it to sp->path things are kosher.
581: */
582: if (oldperms) {
583: /* Use perms of the existing file. */
584: if (fstat(sp->fd, &sb) == -1)
585: error(1, _("unable to stat %s"), sp->path);
586: if (chown(sp->tpath, sb.st_uid, sb.st_gid) != 0) {
587: warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
588: sp->tpath, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid);
589: }
590: if (chmod(sp->tpath, sb.st_mode & 0777) != 0) {
591: warning(_("unable to change mode of %s to 0%o"), sp->tpath,
592: (unsigned int)(sb.st_mode & 0777));
593: }
594: } else {
595: if (chown(sp->tpath, SUDOERS_UID, SUDOERS_GID) != 0) {
596: warning(_("unable to set (uid, gid) of %s to (%u, %u)"),
597: sp->tpath, SUDOERS_UID, SUDOERS_GID);
1.1.1.2 misho 598: goto done;
1.1 misho 599: }
600: if (chmod(sp->tpath, SUDOERS_MODE) != 0) {
601: warning(_("unable to change mode of %s to 0%o"), sp->tpath,
602: SUDOERS_MODE);
1.1.1.2 misho 603: goto done;
1.1 misho 604: }
605: }
606:
607: /*
608: * Now that sp->tpath is sane (parses ok) it needs to be
609: * rename(2)'d to sp->path. If the rename(2) fails we try using
610: * mv(1) in case sp->tpath and sp->path are on different file systems.
611: */
612: if (rename(sp->tpath, sp->path) == 0) {
613: efree(sp->tpath);
614: sp->tpath = NULL;
615: } else {
616: if (errno == EXDEV) {
617: char *av[4];
618: warningx(_("%s and %s not on the same file system, using mv to rename"),
619: sp->tpath, sp->path);
620:
621: /* Build up argument vector for the command */
622: if ((av[0] = strrchr(_PATH_MV, '/')) != NULL)
623: av[0]++;
624: else
625: av[0] = _PATH_MV;
626: av[1] = sp->tpath;
627: av[2] = sp->path;
628: av[3] = NULL;
629:
630: /* And run it... */
631: if (run_command(_PATH_MV, av)) {
632: warningx(_("command failed: '%s %s %s', %s unchanged"),
633: _PATH_MV, sp->tpath, sp->path, sp->path);
634: (void) unlink(sp->tpath);
635: efree(sp->tpath);
636: sp->tpath = NULL;
1.1.1.2 misho 637: goto done;
1.1 misho 638: }
639: efree(sp->tpath);
640: sp->tpath = NULL;
641: } else {
642: warning(_("error renaming %s, %s unchanged"), sp->tpath, sp->path);
643: (void) unlink(sp->tpath);
1.1.1.2 misho 644: goto done;
1.1 misho 645: }
646: }
1.1.1.2 misho 647: rval = true;
648: done:
649: debug_return_bool(rval);
1.1 misho 650: }
651:
652: /* STUB */
653: void
654: set_fqdn(void)
655: {
656: return;
657: }
658:
659: /* STUB */
660: void
661: init_envtables(void)
662: {
663: return;
664: }
665:
666: /* STUB */
1.1.1.2 misho 667: bool
1.1 misho 668: user_is_exempt(void)
669: {
1.1.1.2 misho 670: return false;
1.1 misho 671: }
672:
673: /* STUB */
674: void
675: sudo_setspent(void)
676: {
677: return;
678: }
679:
680: /* STUB */
681: void
682: sudo_endspent(void)
683: {
684: return;
685: }
686:
687: /* STUB */
688: int
689: group_plugin_query(const char *user, const char *group, const struct passwd *pw)
690: {
1.1.1.2 misho 691: return false;
1.1 misho 692: }
693:
694: /*
695: * Assuming a parse error occurred, prompt the user for what they want
696: * to do now. Returns the first letter of their choice.
697: */
1.1.1.2 misho 698: static int
1.1 misho 699: whatnow(void)
700: {
701: int choice, c;
1.1.1.2 misho 702: debug_decl(whatnow, SUDO_DEBUG_UTIL)
1.1 misho 703:
704: for (;;) {
705: (void) fputs(_("What now? "), stdout);
706: choice = getchar();
707: for (c = choice; c != '\n' && c != EOF;)
708: c = getchar();
709:
710: switch (choice) {
711: case EOF:
712: choice = 'x';
713: /* FALLTHROUGH */
714: case 'e':
715: case 'x':
716: case 'Q':
1.1.1.2 misho 717: debug_return_int(choice);
1.1 misho 718: default:
719: (void) puts(_("Options are:\n"
720: " (e)dit sudoers file again\n"
721: " e(x)it without saving changes to sudoers file\n"
722: " (Q)uit and save changes to sudoers file (DANGER!)\n"));
723: }
724: }
725: }
726:
727: /*
728: * Install signal handlers for visudo.
729: */
730: static void
731: setup_signals(void)
732: {
1.1.1.2 misho 733: sigaction_t sa;
734: debug_decl(setup_signals, SUDO_DEBUG_UTIL)
1.1 misho 735:
1.1.1.2 misho 736: /*
737: * Setup signal handlers to cleanup nicely.
738: */
739: zero_bytes(&sa, sizeof(sa));
740: sigemptyset(&sa.sa_mask);
741: sa.sa_flags = SA_RESTART;
742: sa.sa_handler = quit;
743: (void) sigaction(SIGTERM, &sa, NULL);
744: (void) sigaction(SIGHUP, &sa, NULL);
745: (void) sigaction(SIGINT, &sa, NULL);
746: (void) sigaction(SIGQUIT, &sa, NULL);
747:
748: debug_return;
1.1 misho 749: }
750:
751: static int
752: run_command(char *path, char **argv)
753: {
754: int status;
755: pid_t pid, rv;
1.1.1.2 misho 756: debug_decl(run_command, SUDO_DEBUG_UTIL)
1.1 misho 757:
1.1.1.2 misho 758: switch (pid = sudo_debug_fork()) {
1.1 misho 759: case -1:
760: error(1, _("unable to execute %s"), path);
761: break; /* NOTREACHED */
762: case 0:
763: sudo_endpwent();
764: sudo_endgrent();
765: closefrom(STDERR_FILENO + 1);
766: execv(path, argv);
767: warning(_("unable to run %s"), path);
768: _exit(127);
769: break; /* NOTREACHED */
770: }
771:
772: do {
773: rv = waitpid(pid, &status, 0);
774: } while (rv == -1 && errno == EINTR);
775:
1.1.1.2 misho 776: if (rv != -1)
777: rv = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
778: debug_return_int(rv);
1.1 misho 779: }
780:
1.1.1.2 misho 781: static bool
782: check_owner(const char *path, bool quiet)
1.1 misho 783: {
784: struct stat sb;
1.1.1.2 misho 785: bool ok = true;
786: debug_decl(check_owner, SUDO_DEBUG_UTIL)
787:
788: if (stat(path, &sb) == 0) {
789: if (sb.st_uid != SUDOERS_UID || sb.st_gid != SUDOERS_GID) {
790: ok = false;
791: if (!quiet) {
792: fprintf(stderr,
793: _("%s: wrong owner (uid, gid) should be (%u, %u)\n"),
794: path, SUDOERS_UID, SUDOERS_GID);
795: }
796: }
797: if ((sb.st_mode & 07777) != SUDOERS_MODE) {
798: ok = false;
799: if (!quiet) {
800: fprintf(stderr, _("%s: bad permissions, should be mode 0%o\n"),
801: path, SUDOERS_MODE);
802: }
803: }
804: }
805: debug_return_bool(ok);
806: }
807:
808: static bool
809: check_syntax(char *sudoers_path, bool quiet, bool strict, bool oldperms)
810: {
811: bool ok = false;
812: debug_decl(check_syntax, SUDO_DEBUG_UTIL)
1.1 misho 813:
814: if (strcmp(sudoers_path, "-") == 0) {
815: yyin = stdin;
816: sudoers_path = "stdin";
817: } else if ((yyin = fopen(sudoers_path, "r")) == NULL) {
818: if (!quiet)
819: warning(_("unable to open %s"), sudoers_path);
1.1.1.2 misho 820: goto done;
1.1 misho 821: }
822: init_parser(sudoers_path, quiet);
823: if (yyparse() && !parse_error) {
824: if (!quiet)
825: warningx(_("failed to parse %s file, unknown error"), sudoers_path);
1.1.1.2 misho 826: parse_error = true;
1.1 misho 827: errorfile = sudoers_path;
828: }
1.1.1.3 ! misho 829: if (!parse_error) {
! 830: if (!check_defaults(SETDEF_ALL, quiet) ||
! 831: check_aliases(strict, quiet) != 0) {
! 832: parse_error = true;
! 833: errorfile = NULL;
! 834: }
1.1 misho 835: }
1.1.1.2 misho 836: ok = !parse_error;
837:
838: if (parse_error) {
839: if (!quiet) {
1.1 misho 840: if (errorlineno != -1)
841: (void) printf(_("parse error in %s near line %d\n"),
842: errorfile, errorlineno);
843: else
844: (void) printf(_("parse error in %s\n"), errorfile);
845: }
1.1.1.2 misho 846: } else {
847: struct sudoersfile *sp;
848:
849: /* Parsed OK, check mode and owner. */
850: if (oldperms || check_owner(sudoers_path, quiet))
851: (void) printf(_("%s: parsed OK\n"), sudoers_path);
852: else
853: ok = false;
854: tq_foreach_fwd(&sudoerslist, sp) {
855: if (oldperms || check_owner(sp->path, quiet))
856: (void) printf(_("%s: parsed OK\n"), sp->path);
857: else
858: ok = false;
1.1 misho 859: }
860: }
861:
1.1.1.2 misho 862: done:
863: debug_return_bool(ok);
1.1 misho 864: }
865:
866: /*
867: * Used to open (and lock) the initial sudoers file and to also open
868: * any subsequent files #included via a callback from the parser.
869: */
870: FILE *
1.1.1.2 misho 871: open_sudoers(const char *path, bool doedit, bool *keepopen)
1.1 misho 872: {
873: struct sudoersfile *entry;
874: FILE *fp;
1.1.1.2 misho 875: int open_flags;
876: debug_decl(open_sudoers, SUDO_DEBUG_UTIL)
877:
878: if (checkonly)
879: open_flags = O_RDONLY;
880: else
881: open_flags = O_RDWR | O_CREAT;
1.1 misho 882:
883: /* Check for existing entry */
884: tq_foreach_fwd(&sudoerslist, entry) {
885: if (strcmp(path, entry->path) == 0)
886: break;
887: }
888: if (entry == NULL) {
1.1.1.2 misho 889: entry = ecalloc(1, sizeof(*entry));
1.1 misho 890: entry->path = estrdup(path);
1.1.1.2 misho 891: /* entry->modified = 0; */
1.1 misho 892: entry->prev = entry;
1.1.1.2 misho 893: /* entry->next = NULL; */
894: entry->fd = open(entry->path, open_flags, SUDOERS_MODE);
895: /* entry->tpath = NULL; */
1.1 misho 896: entry->doedit = doedit;
897: if (entry->fd == -1) {
898: warning("%s", entry->path);
899: efree(entry);
1.1.1.2 misho 900: debug_return_ptr(NULL);
1.1 misho 901: }
1.1.1.2 misho 902: if (!checkonly && !lock_file(entry->fd, SUDO_TLOCK))
1.1 misho 903: errorx(1, _("%s busy, try again later"), entry->path);
904: if ((fp = fdopen(entry->fd, "r")) == NULL)
905: error(1, "%s", entry->path);
906: tq_append(&sudoerslist, entry);
907: } else {
908: /* Already exists, open .tmp version if there is one. */
909: if (entry->tpath != NULL) {
910: if ((fp = fopen(entry->tpath, "r")) == NULL)
911: error(1, "%s", entry->tpath);
912: } else {
913: if ((fp = fdopen(entry->fd, "r")) == NULL)
914: error(1, "%s", entry->path);
915: rewind(fp);
916: }
917: }
918: if (keepopen != NULL)
1.1.1.2 misho 919: *keepopen = true;
920: debug_return_ptr(fp);
1.1 misho 921: }
922:
923: static char *
924: get_editor(char **args)
925: {
926: char *Editor, *EditorArgs, *EditorPath, *UserEditor, *UserEditorArgs;
1.1.1.2 misho 927: debug_decl(get_editor, SUDO_DEBUG_UTIL)
1.1 misho 928:
929: /*
930: * Check VISUAL and EDITOR environment variables to see which editor
931: * the user wants to use (we may not end up using it though).
932: * If the path is not fully-qualified, make it so and check that
933: * the specified executable actually exists.
934: */
935: UserEditorArgs = NULL;
936: if ((UserEditor = getenv("VISUAL")) == NULL || *UserEditor == '\0')
937: UserEditor = getenv("EDITOR");
938: if (UserEditor && *UserEditor == '\0')
939: UserEditor = NULL;
940: else if (UserEditor) {
941: UserEditorArgs = get_args(UserEditor);
942: if (find_path(UserEditor, &Editor, NULL, getenv("PATH"), 0) == FOUND) {
943: UserEditor = Editor;
944: } else {
945: if (def_env_editor) {
946: /* If we are honoring $EDITOR this is a fatal error. */
947: errorx(1, _("specified editor (%s) doesn't exist"), UserEditor);
948: } else {
949: /* Otherwise, just ignore $EDITOR. */
950: UserEditor = NULL;
951: }
952: }
953: }
954:
955: /*
956: * See if we can use the user's choice of editors either because
957: * we allow any $EDITOR or because $EDITOR is in the allowable list.
958: */
959: Editor = EditorArgs = EditorPath = NULL;
960: if (def_env_editor && UserEditor) {
961: Editor = UserEditor;
962: EditorArgs = UserEditorArgs;
963: } else if (UserEditor) {
964: struct stat editor_sb;
965: struct stat user_editor_sb;
966: char *base, *userbase;
967:
968: if (stat(UserEditor, &user_editor_sb) != 0) {
969: /* Should never happen since we already checked above. */
970: error(1, _("unable to stat editor (%s)"), UserEditor);
971: }
972: EditorPath = estrdup(def_editor);
973: Editor = strtok(EditorPath, ":");
974: do {
975: EditorArgs = get_args(Editor);
976: /*
977: * Both Editor and UserEditor should be fully qualified but
978: * check anyway...
979: */
980: if ((base = strrchr(Editor, '/')) == NULL)
981: continue;
982: if ((userbase = strrchr(UserEditor, '/')) == NULL) {
983: Editor = NULL;
984: break;
985: }
986: base++, userbase++;
987:
988: /*
989: * We compare the basenames first and then use stat to match
990: * for sure.
991: */
992: if (strcmp(base, userbase) == 0) {
993: if (stat(Editor, &editor_sb) == 0 && S_ISREG(editor_sb.st_mode)
994: && (editor_sb.st_mode & 0000111) &&
995: editor_sb.st_dev == user_editor_sb.st_dev &&
996: editor_sb.st_ino == user_editor_sb.st_ino)
997: break;
998: }
999: } while ((Editor = strtok(NULL, ":")));
1000: }
1001:
1002: /*
1003: * Can't use $EDITOR, try each element of def_editor until we
1004: * find one that exists, is regular, and is executable.
1005: */
1006: if (Editor == NULL || *Editor == '\0') {
1007: efree(EditorPath);
1008: EditorPath = estrdup(def_editor);
1009: Editor = strtok(EditorPath, ":");
1010: do {
1011: EditorArgs = get_args(Editor);
1012: if (sudo_goodpath(Editor, NULL))
1013: break;
1014: } while ((Editor = strtok(NULL, ":")));
1015:
1016: /* Bleah, none of the editors existed! */
1017: if (Editor == NULL || *Editor == '\0')
1018: errorx(1, _("no editor found (editor path = %s)"), def_editor);
1019: }
1020: *args = EditorArgs;
1.1.1.2 misho 1021: debug_return_str(Editor);
1.1 misho 1022: }
1023:
1024: /*
1025: * Split out any command line arguments and return them.
1026: */
1027: static char *
1028: get_args(char *cmnd)
1029: {
1030: char *args;
1.1.1.2 misho 1031: debug_decl(get_args, SUDO_DEBUG_UTIL)
1.1 misho 1032:
1033: args = cmnd;
1034: while (*args && !isblank((unsigned char) *args))
1035: args++;
1036: if (*args) {
1037: *args++ = '\0';
1038: while (*args && isblank((unsigned char) *args))
1039: args++;
1040: }
1.1.1.2 misho 1041: debug_return_str(*args ? args : NULL);
1.1 misho 1042: }
1043:
1044: /*
1045: * Look up the hostname and set user_host and user_shost.
1046: */
1047: static void
1048: get_hostname(void)
1049: {
1050: char *p, thost[MAXHOSTNAMELEN + 1];
1.1.1.2 misho 1051: debug_decl(get_hostname, SUDO_DEBUG_UTIL)
1.1 misho 1052:
1.1.1.2 misho 1053: if (gethostname(thost, sizeof(thost)) != -1) {
1054: thost[sizeof(thost) - 1] = '\0';
1055: user_host = estrdup(thost);
1056:
1057: if ((p = strchr(user_host, '.'))) {
1058: *p = '\0';
1059: user_shost = estrdup(user_host);
1060: *p = '.';
1061: } else {
1062: user_shost = user_host;
1063: }
1.1 misho 1064: } else {
1.1.1.2 misho 1065: user_host = user_shost = "localhost";
1.1 misho 1066: }
1.1.1.2 misho 1067: debug_return;
1.1 misho 1068: }
1069:
1.1.1.2 misho 1070: static bool
1071: alias_remove_recursive(char *name, int type)
1.1 misho 1072: {
1073: struct member *m;
1074: struct alias *a;
1.1.1.2 misho 1075: bool rval = true;
1076: debug_decl(alias_remove_recursive, SUDO_DEBUG_ALIAS)
1.1 misho 1077:
1078: if ((a = alias_find(name, type)) != NULL) {
1079: tq_foreach_fwd(&a->members, m) {
1080: if (m->type == ALIAS) {
1.1.1.2 misho 1081: if (!alias_remove_recursive(m->name, type))
1082: rval = false;
1.1 misho 1083: }
1084: }
1085: }
1086: alias_seqno++;
1087: a = alias_remove(name, type);
1088: if (a)
1089: rbinsert(alias_freelist, a);
1.1.1.2 misho 1090: debug_return_bool(rval);
1.1 misho 1091: }
1092:
1093: static int
1094: check_alias(char *name, int type, int strict, int quiet)
1095: {
1096: struct member *m;
1097: struct alias *a;
1.1.1.2 misho 1098: int errors = 0;
1099: debug_decl(check_alias, SUDO_DEBUG_ALIAS)
1.1 misho 1100:
1101: if ((a = alias_find(name, type)) != NULL) {
1102: /* check alias contents */
1103: tq_foreach_fwd(&a->members, m) {
1104: if (m->type == ALIAS)
1.1.1.2 misho 1105: errors += check_alias(m->name, type, strict, quiet);
1.1 misho 1106: }
1107: } else {
1108: if (!quiet) {
1109: char *fmt;
1110: if (errno == ELOOP) {
1111: fmt = strict ?
1112: _("Error: cycle in %s_Alias `%s'") :
1113: _("Warning: cycle in %s_Alias `%s'");
1114: } else {
1115: fmt = strict ?
1116: _("Error: %s_Alias `%s' referenced but not defined") :
1117: _("Warning: %s_Alias `%s' referenced but not defined");
1118: }
1119: warningx(fmt,
1120: type == HOSTALIAS ? "Host" : type == CMNDALIAS ? "Cmnd" :
1121: type == USERALIAS ? "User" : type == RUNASALIAS ? "Runas" :
1122: "Unknown", name);
1123: }
1.1.1.2 misho 1124: errors++;
1.1 misho 1125: }
1126:
1.1.1.2 misho 1127: debug_return_int(errors);
1.1 misho 1128: }
1129:
1130: /*
1131: * Iterate through the sudoers datastructures looking for undefined
1132: * aliases or unused aliases.
1133: */
1134: static int
1.1.1.2 misho 1135: check_aliases(bool strict, bool quiet)
1.1 misho 1136: {
1137: struct cmndspec *cs;
1138: struct member *m, *binding;
1139: struct privilege *priv;
1140: struct userspec *us;
1141: struct defaults *d;
1.1.1.2 misho 1142: int atype, errors = 0;
1143: debug_decl(check_aliases, SUDO_DEBUG_ALIAS)
1.1 misho 1144:
1145: alias_freelist = rbcreate(alias_compare);
1146:
1147: /* Forward check. */
1148: tq_foreach_fwd(&userspecs, us) {
1149: tq_foreach_fwd(&us->users, m) {
1150: if (m->type == ALIAS) {
1151: alias_seqno++;
1.1.1.2 misho 1152: errors += check_alias(m->name, USERALIAS, strict, quiet);
1.1 misho 1153: }
1154: }
1155: tq_foreach_fwd(&us->privileges, priv) {
1156: tq_foreach_fwd(&priv->hostlist, m) {
1157: if (m->type == ALIAS) {
1158: alias_seqno++;
1.1.1.2 misho 1159: errors += check_alias(m->name, HOSTALIAS, strict, quiet);
1.1 misho 1160: }
1161: }
1162: tq_foreach_fwd(&priv->cmndlist, cs) {
1163: tq_foreach_fwd(&cs->runasuserlist, m) {
1164: if (m->type == ALIAS) {
1165: alias_seqno++;
1.1.1.2 misho 1166: errors += check_alias(m->name, RUNASALIAS, strict, quiet);
1.1 misho 1167: }
1168: }
1169: if ((m = cs->cmnd)->type == ALIAS) {
1170: alias_seqno++;
1.1.1.2 misho 1171: errors += check_alias(m->name, CMNDALIAS, strict, quiet);
1.1 misho 1172: }
1173: }
1174: }
1175: }
1176:
1177: /* Reverse check (destructive) */
1178: tq_foreach_fwd(&userspecs, us) {
1179: tq_foreach_fwd(&us->users, m) {
1180: if (m->type == ALIAS) {
1181: alias_seqno++;
1.1.1.2 misho 1182: if (!alias_remove_recursive(m->name, USERALIAS))
1183: errors++;
1.1 misho 1184: }
1185: }
1186: tq_foreach_fwd(&us->privileges, priv) {
1187: tq_foreach_fwd(&priv->hostlist, m) {
1188: if (m->type == ALIAS) {
1189: alias_seqno++;
1.1.1.2 misho 1190: if (!alias_remove_recursive(m->name, HOSTALIAS))
1191: errors++;
1.1 misho 1192: }
1193: }
1194: tq_foreach_fwd(&priv->cmndlist, cs) {
1195: tq_foreach_fwd(&cs->runasuserlist, m) {
1196: if (m->type == ALIAS) {
1197: alias_seqno++;
1.1.1.2 misho 1198: if (!alias_remove_recursive(m->name, RUNASALIAS))
1199: errors++;
1.1 misho 1200: }
1201: }
1202: if ((m = cs->cmnd)->type == ALIAS) {
1203: alias_seqno++;
1.1.1.2 misho 1204: if (!alias_remove_recursive(m->name, CMNDALIAS))
1205: errors++;
1.1 misho 1206: }
1207: }
1208: }
1209: }
1210: tq_foreach_fwd(&defaults, d) {
1211: switch (d->type) {
1212: case DEFAULTS_HOST:
1213: atype = HOSTALIAS;
1214: break;
1215: case DEFAULTS_USER:
1216: atype = USERALIAS;
1217: break;
1218: case DEFAULTS_RUNAS:
1219: atype = RUNASALIAS;
1220: break;
1221: case DEFAULTS_CMND:
1222: atype = CMNDALIAS;
1223: break;
1224: default:
1225: continue; /* not an alias */
1226: }
1227: tq_foreach_fwd(&d->binding, binding) {
1228: for (m = binding; m != NULL; m = m->next) {
1229: if (m->type == ALIAS) {
1230: alias_seqno++;
1.1.1.2 misho 1231: if (!alias_remove_recursive(m->name, atype))
1232: errors++;
1.1 misho 1233: }
1234: }
1235: }
1236: }
1237: rbdestroy(alias_freelist, alias_free);
1238:
1239: /* If all aliases were referenced we will have an empty tree. */
1240: if (!no_aliases() && !quiet)
1241: alias_apply(print_unused, strict ? "Error" : "Warning");
1242:
1.1.1.2 misho 1243: debug_return_int(strict ? errors : 0);
1.1 misho 1244: }
1245:
1246: static int
1247: print_unused(void *v1, void *v2)
1248: {
1249: struct alias *a = (struct alias *)v1;
1250: char *prefix = (char *)v2;
1251:
1.1.1.2 misho 1252: warningx2(_("%s: unused %s_Alias %s"), prefix,
1.1 misho 1253: a->type == HOSTALIAS ? "Host" : a->type == CMNDALIAS ? "Cmnd" :
1254: a->type == USERALIAS ? "User" : a->type == RUNASALIAS ? "Runas" :
1255: "Unknown", a->name);
1256: return 0;
1257: }
1258:
1259: /*
1260: * Unlink any sudoers temp files that remain.
1261: */
1262: void
1263: cleanup(int gotsignal)
1264: {
1265: struct sudoersfile *sp;
1266:
1267: tq_foreach_fwd(&sudoerslist, sp) {
1268: if (sp->tpath != NULL)
1269: (void) unlink(sp->tpath);
1270: }
1271: if (!gotsignal) {
1272: sudo_endpwent();
1273: sudo_endgrent();
1274: }
1275: }
1276:
1277: /*
1278: * Unlink sudoers temp files (if any) and exit.
1279: */
1280: static void
1281: quit(int signo)
1282: {
1283: const char *signame, *myname;
1284:
1285: cleanup(signo);
1286: #define emsg " exiting due to signal: "
1287: myname = getprogname();
1288: signame = strsignal(signo);
1.1.1.2 misho 1289: ignore_result(write(STDERR_FILENO, myname, strlen(myname)));
1290: ignore_result(write(STDERR_FILENO, emsg, sizeof(emsg) - 1));
1291: ignore_result(write(STDERR_FILENO, signame, strlen(signame)));
1292: ignore_result(write(STDERR_FILENO, "\n", 1));
1.1 misho 1293: _exit(signo);
1294: }
1295:
1296: static void
1297: usage(int fatal)
1298: {
1299: (void) fprintf(fatal ? stderr : stdout,
1300: "usage: %s [-chqsV] [-f sudoers]\n", getprogname());
1301: if (fatal)
1302: exit(1);
1303: }
1304:
1305: static void
1306: help(void)
1307: {
1308: (void) printf(_("%s - safely edit the sudoers file\n\n"), getprogname());
1309: usage(0);
1310: (void) puts(_("\nOptions:\n"
1311: " -c check-only mode\n"
1312: " -f sudoers specify sudoers file location\n"
1313: " -h display help message and exit\n"
1314: " -q less verbose (quiet) syntax error messages\n"
1315: " -s strict syntax checking\n"
1316: " -V display version information and exit"));
1317: exit(0);
1318: }
1319:
1320: static int
1321: visudo_printf(int msg_type, const char *fmt, ...)
1322: {
1323: va_list ap;
1324: FILE *fp;
1325:
1326: switch (msg_type) {
1327: case SUDO_CONV_INFO_MSG:
1328: fp = stdout;
1329: break;
1330: case SUDO_CONV_ERROR_MSG:
1331: fp = stderr;
1332: break;
1333: default:
1334: errno = EINVAL;
1335: return -1;
1336: }
1337:
1338: va_start(ap, fmt);
1339: vfprintf(fp, fmt, ap);
1340: va_end(ap);
1341:
1342: return 0;
1343: }
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