Annotation of src/usr.bin/sudo/sudo.c, Revision 1.40
1.1 millert 1: /*
1.39 millert 2: * Copyright (c) 1993-1996, 1998-2009 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 3: *
1.23 millert 4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
1.1 millert 7: *
1.23 millert 8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 millert 15: *
1.20 millert 16: * Sponsored in part by the Defense Advanced Research Projects
17: * Agency (DARPA) and Air Force Research Laboratory, Air Force
18: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
19: *
1.1 millert 20: * For a brief history of sudo, please see the HISTORY file included
21: * with this distribution.
22: */
23:
1.19 millert 24: #define _SUDO_MAIN
1.1 millert 25:
1.23 millert 26: #ifdef __TANDEM
27: # include <floss.h>
28: #endif
29:
1.27 millert 30: #include <config.h>
1.1 millert 31:
1.11 millert 32: #include <sys/types.h>
33: #include <sys/stat.h>
34: #include <sys/param.h>
35: #include <sys/socket.h>
36: #ifdef HAVE_SETRLIMIT
37: # include <sys/time.h>
38: # include <sys/resource.h>
39: #endif
1.1 millert 40: #include <stdio.h>
41: #ifdef STDC_HEADERS
1.11 millert 42: # include <stdlib.h>
43: # include <stddef.h>
44: #else
45: # ifdef HAVE_STDLIB_H
46: # include <stdlib.h>
47: # endif
1.1 millert 48: #endif /* STDC_HEADERS */
1.11 millert 49: #ifdef HAVE_STRING_H
50: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
51: # include <memory.h>
52: # endif
53: # include <string.h>
54: #else
55: # ifdef HAVE_STRINGS_H
56: # include <strings.h>
57: # endif
58: #endif /* HAVE_STRING_H */
1.1 millert 59: #ifdef HAVE_UNISTD_H
1.11 millert 60: # include <unistd.h>
1.1 millert 61: #endif /* HAVE_UNISTD_H */
62: #include <pwd.h>
63: #include <errno.h>
64: #include <fcntl.h>
65: #include <signal.h>
66: #include <grp.h>
1.27 millert 67: #if TIME_WITH_SYS_TIME
68: # include <time.h>
69: #endif
70: #ifdef HAVE_SETLOCALE
71: # include <locale.h>
72: #endif
1.1 millert 73: #include <netinet/in.h>
74: #include <netdb.h>
75: #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
76: # ifdef __hpux
77: # undef MAXINT
78: # include <hpsecurity.h>
79: # else
80: # include <sys/security.h>
81: # endif /* __hpux */
82: # include <prot.h>
83: #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
1.8 millert 84: #ifdef HAVE_LOGIN_CAP_H
1.4 millert 85: # include <login_cap.h>
86: # ifndef LOGIN_DEFROOTCLASS
87: # define LOGIN_DEFROOTCLASS "daemon"
88: # endif
89: #endif
1.27 millert 90: #ifdef HAVE_PROJECT_H
91: # include <project.h>
92: # include <sys/task.h>
93: #endif
1.33 millert 94: #ifdef HAVE_SELINUX
95: # include <selinux/selinux.h>
96: #endif
1.1 millert 97:
1.38 millert 98: #include <sudo_usage.h>
1.1 millert 99: #include "sudo.h"
1.34 millert 100: #include "lbuf.h"
1.1 millert 101: #include "interfaces.h"
1.39 millert 102:
103: #ifdef USING_NONUNIX_GROUPS
104: # include "nonunix.h"
105: #endif
1.1 millert 106:
107: #ifndef lint
1.39 millert 108: __unused static const char rcsid[] = "$Sudo: sudo.c,v 1.517 2009/05/27 00:49:07 millert Exp $";
1.1 millert 109: #endif /* lint */
110:
111: /*
112: * Prototypes
113: */
1.34 millert 114: static void init_vars __P((int, char **));
115: static int set_cmnd __P((int));
1.19 millert 116: static int parse_args __P((int, char **));
1.11 millert 117: static void initial_setup __P((void));
118: static void set_loginclass __P((struct passwd *));
1.27 millert 119: static void set_project __P((struct passwd *));
1.34 millert 120: static void set_runasgr __P((char *));
121: static void set_runaspw __P((char *));
122: static void show_version __P((void));
1.27 millert 123: static void usage __P((int))
124: __attribute__((__noreturn__));
125: static void usage_excl __P((int))
126: __attribute__((__noreturn__));
1.6 millert 127: static struct passwd *get_authpw __P((void));
1.27 millert 128: extern int sudo_edit __P((int, char **, char **));
1.34 millert 129: extern void rebuild_env __P((int, int));
130: void validate_env_vars __P((struct list_member *));
131: void insert_env_vars __P((struct list_member *));
1.1 millert 132:
133: /*
134: * Globals
135: */
1.19 millert 136: int Argc, NewArgc;
137: char **Argv, **NewArgv;
1.23 millert 138: char *prev_user;
1.34 millert 139: static int user_closefrom = -1;
1.1 millert 140: struct sudo_user sudo_user;
1.34 millert 141: struct passwd *auth_pw, *list_pw;
1.1 millert 142: struct interface *interfaces;
143: int num_interfaces;
1.4 millert 144: int tgetpass_flags;
1.34 millert 145: int long_list;
1.17 millert 146: uid_t timestamp_uid;
1.1 millert 147: extern int errorlineno;
1.34 millert 148: extern int parse_error;
149: extern char *errorfile;
1.4 millert 150: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
151: static struct rlimit corelimit;
1.20 millert 152: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.8 millert 153: #ifdef HAVE_LOGIN_CAP_H
154: login_cap_t *lc;
155: #endif /* HAVE_LOGIN_CAP_H */
156: #ifdef HAVE_BSD_AUTH_H
157: char *login_style;
158: #endif /* HAVE_BSD_AUTH_H */
1.33 millert 159: sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
1.34 millert 160: static char *runas_user;
161: static char *runas_group;
162: static struct sudo_nss_list *snl;
163:
164: /* For getopt(3) */
165: extern char *optarg;
166: extern int optind;
1.1 millert 167:
168: int
1.11 millert 169: main(argc, argv, envp)
1.1 millert 170: int argc;
171: char **argv;
1.11 millert 172: char **envp;
1.1 millert 173: {
1.34 millert 174: int sources = 0, validated;
175: int fd, cmnd_status, sudo_mode, pwflag, rc = 0;
1.23 millert 176: sigaction_t sa;
1.35 deraadt 177: struct sudo_nss *nss;
1.34 millert 178: #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
179: extern char *malloc_options;
180: malloc_options = "AFGJPR";
181: #endif
1.1 millert 182:
1.27 millert 183: #ifdef HAVE_SETLOCALE
184: setlocale(LC_ALL, "");
185: #endif
186:
1.19 millert 187: Argv = argv;
1.23 millert 188: if ((Argc = argc) < 1)
189: usage(1);
1.19 millert 190:
1.1 millert 191: /* Must be done as the first thing... */
192: #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
1.19 millert 193: (void) set_auth_parameters(Argc, Argv);
1.1 millert 194: # ifdef HAVE_INITPRIVS
195: initprivs();
196: # endif
197: #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
198:
1.19 millert 199: if (geteuid() != 0)
1.34 millert 200: errorx(1, "must be setuid root");
1.1 millert 201:
202: /*
1.17 millert 203: * Signal setup:
204: * Ignore keyboard-generated signals so the user cannot interrupt
205: * us at some point and avoid the logging.
206: * Install handler to wait for children when they exit.
1.1 millert 207: */
1.34 millert 208: zero_bytes(&sa, sizeof(sa));
1.11 millert 209: sigemptyset(&sa.sa_mask);
210: sa.sa_flags = SA_RESTART;
211: sa.sa_handler = SIG_IGN;
1.17 millert 212: (void) sigaction(SIGINT, &sa, &saved_sa_int);
213: (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
214: (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
1.1 millert 215:
216: /*
1.34 millert 217: * Turn off core dumps and make sure fds 0-2 are open.
1.1 millert 218: */
219: initial_setup();
1.34 millert 220: sudo_setpwent();
221: sudo_setgrent();
1.1 millert 222:
223: /* Parse our arguments. */
1.19 millert 224: sudo_mode = parse_args(Argc, Argv);
1.1 millert 225:
226: /* Setup defaults data structures. */
227: init_defaults();
228:
1.11 millert 229: /* Load the list of local ip addresses and netmasks. */
230: load_interfaces();
231:
232: pwflag = 0;
1.23 millert 233: if (ISSET(sudo_mode, MODE_SHELL))
1.1 millert 234: user_cmnd = "shell";
1.23 millert 235: else if (ISSET(sudo_mode, MODE_EDIT))
236: user_cmnd = "sudoedit";
1.38 millert 237: else {
1.1 millert 238: switch (sudo_mode) {
239: case MODE_VERSION:
1.34 millert 240: show_version();
1.1 millert 241: break;
242: case MODE_HELP:
243: usage(0);
244: break;
245: case MODE_VALIDATE:
1.38 millert 246: case MODE_VALIDATE|MODE_INVALIDATE:
1.1 millert 247: user_cmnd = "validate";
1.23 millert 248: pwflag = I_VERIFYPW;
1.1 millert 249: break;
250: case MODE_KILL:
251: case MODE_INVALIDATE:
252: user_cmnd = "kill";
1.11 millert 253: pwflag = -1;
1.1 millert 254: break;
255: case MODE_LISTDEFS:
256: list_options();
257: exit(0);
258: break;
259: case MODE_LIST:
1.38 millert 260: case MODE_LIST|MODE_INVALIDATE:
1.1 millert 261: user_cmnd = "list";
1.23 millert 262: pwflag = I_LISTPW;
1.34 millert 263: break;
264: case MODE_CHECK:
1.38 millert 265: case MODE_CHECK|MODE_INVALIDATE:
1.34 millert 266: pwflag = I_LISTPW;
1.1 millert 267: break;
268: }
1.38 millert 269: }
1.1 millert 270:
271: /* Must have a command to run... */
272: if (user_cmnd == NULL && NewArgc == 0)
273: usage(1);
274:
1.34 millert 275: init_vars(sudo_mode, envp); /* XXX - move this later? */
276:
1.39 millert 277: #ifdef USING_NONUNIX_GROUPS
278: sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */
279: #endif /* USING_NONUNIX_GROUPS */
280:
1.34 millert 281: /* Parse nsswitch.conf for sudoers order. */
282: snl = sudo_read_nss();
283:
284: /* Open and parse sudoers, set global defaults */
285: tq_foreach_fwd(snl, nss) {
286: if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
287: sources++;
288: nss->setdefs(nss);
289: }
290: }
291: if (sources == 0)
292: log_error(0, "no valid sudoers sources found, quitting");
293:
294: /* XXX - collect post-sudoers parse settings into a function */
295:
296: /*
297: * Set runas passwd/group entries based on command line or sudoers.
298: * Note that if runas_group was specified without runas_user we
299: * defer setting runas_pw so the match routines know to ignore it.
300: */
301: if (runas_group != NULL) {
302: set_runasgr(runas_group);
303: if (runas_user != NULL)
304: set_runaspw(runas_user);
305: } else
306: set_runaspw(runas_user ? runas_user : def_runas_default);
307:
308: if (!update_defaults(SETDEF_RUNAS))
309: log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
310:
311: /* Set login class if applicable. */
312: set_loginclass(sudo_user.pw);
1.1 millert 313:
1.34 millert 314: /* Update initial shell now that runas is set. */
315: if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
316: NewArgv[0] = runas_pw->pw_shell;
317:
318: /* This goes after sudoers is parsed since it may have timestamp options. */
319: if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
320: remove_timestamp((sudo_mode == MODE_KILL));
321: cleanup(0);
322: exit(0);
323: }
324:
325: /* Is root even allowed to run sudo? */
326: if (user_uid == 0 && !def_root_sudo) {
327: (void) fprintf(stderr,
328: "Sorry, %s has been configured to not allow root to run it.\n",
329: getprogname());
330: exit(1);
331: }
1.23 millert 332:
1.34 millert 333: /* Check for -C overriding def_closefrom. */
334: if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
335: if (!def_closefrom_override)
336: errorx(1, "you are not permitted to use the -C option");
337: else
338: def_closefrom = user_closefrom;
1.23 millert 339: }
1.33 millert 340:
1.34 millert 341: cmnd_status = set_cmnd(sudo_mode);
342:
343: #ifdef HAVE_SETLOCALE
344: if (!setlocale(LC_ALL, def_sudoers_locale)) {
345: warningx("unable to set locale to \"%s\", using \"C\"",
346: def_sudoers_locale);
347: setlocale(LC_ALL, "C");
348: }
1.23 millert 349: #endif
1.34 millert 350:
351: validated = FLAG_NO_USER | FLAG_NO_HOST;
352: tq_foreach_fwd(snl, nss) {
353: validated = nss->lookup(nss, validated, pwflag);
354:
1.38 millert 355: if (ISSET(validated, VALIDATE_OK)) {
356: /* Handle "= auth" in netsvc.conf */
357: if (nss->ret_if_found)
358: break;
359: } else {
360: /* Handle [NOTFOUND=return] */
361: if (nss->ret_if_notfound)
362: break;
363: }
1.34 millert 364: }
1.39 millert 365:
366: #ifdef USING_NONUNIX_GROUPS
367: /* Finished with the groupcheck code */
368: sudo_nonunix_groupcheck_cleanup();
369: #endif
370:
1.26 millert 371: if (safe_cmnd == NULL)
1.27 millert 372: safe_cmnd = estrdup(user_cmnd);
1.1 millert 373:
1.34 millert 374: #ifdef HAVE_SETLOCALE
375: setlocale(LC_ALL, "");
376: #endif
377:
378: /* If only a group was specified, set runas_pw based on invoking user. */
379: if (runas_pw == NULL)
380: set_runaspw(user_name);
381:
1.11 millert 382: /*
1.17 millert 383: * Look up the timestamp dir owner if one is specified.
384: */
1.23 millert 385: if (def_timestampowner) {
1.17 millert 386: struct passwd *pw;
387:
1.23 millert 388: if (*def_timestampowner == '#')
1.34 millert 389: pw = sudo_getpwuid(atoi(def_timestampowner + 1));
1.17 millert 390: else
1.34 millert 391: pw = sudo_getpwnam(def_timestampowner);
1.17 millert 392: if (!pw)
393: log_error(0, "timestamp owner (%s): No such user",
1.23 millert 394: def_timestampowner);
1.17 millert 395: timestamp_uid = pw->pw_uid;
396: }
397:
1.11 millert 398: /* If given the -P option, set the "preserve_groups" flag. */
1.23 millert 399: if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
400: def_preserve_groups = TRUE;
1.11 millert 401:
1.3 millert 402: /* If no command line args and "set_home" is not set, error out. */
1.23 millert 403: if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
1.3 millert 404: usage(1);
405:
1.1 millert 406: /* Bail if a tty is required and we don't have one. */
1.23 millert 407: if (def_requiretty) {
1.38 millert 408: if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
409: audit_failure(NewArgv, "no tty");
1.1 millert 410: log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
1.38 millert 411: } else
1.1 millert 412: (void) close(fd);
413: }
414:
1.34 millert 415: /* Use askpass value from sudoers unless user specified their own. */
416: if (def_askpass && !user_askpass)
417: user_askpass = def_askpass;
418:
419: /* User may have overridden environment resetting via the -E flag. */
420: if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv)
1.27 millert 421: def_env_reset = FALSE;
422:
423: /* Build a new environment that avoids any nasty bits. */
1.34 millert 424: rebuild_env(sudo_mode, def_noexec);
1.27 millert 425:
1.6 millert 426: /* Fill in passwd struct based on user we are authenticating as. */
427: auth_pw = get_authpw();
1.4 millert 428:
1.23 millert 429: /* Require a password if sudoers says so. */
1.34 millert 430: if (def_authenticate)
1.38 millert 431: check_user(validated, sudo_mode);
1.23 millert 432:
433: /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
1.34 millert 434: /* XXX - causes confusion when root is not listed in sudoers */
435: if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
436: if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
1.23 millert 437: struct passwd *pw;
438:
1.34 millert 439: if ((pw = sudo_getpwnam(prev_user)) != NULL)
1.23 millert 440: sudo_user.pw = pw;
1.34 millert 441: }
1.23 millert 442: }
1.1 millert 443:
1.23 millert 444: if (ISSET(validated, VALIDATE_OK)) {
1.1 millert 445: /* Finally tell the user if the command did not exist. */
1.38 millert 446: if (cmnd_status == NOT_FOUND_DOT) {
447: audit_failure(NewArgv, "command in current directory");
1.34 millert 448: errorx(1, "ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
1.38 millert 449: } else if (cmnd_status == NOT_FOUND) {
450: audit_failure(NewArgv, "%s: command not found", user_cmnd);
1.34 millert 451: errorx(1, "%s: command not found", user_cmnd);
1.38 millert 452: }
1.1 millert 453:
1.27 millert 454: /* If user specified env vars make sure sudoers allows it. */
1.34 millert 455: if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
1.27 millert 456: if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
457: log_error(NO_MAIL,
458: "sorry, you are not allowed to preserve the environment");
459: else
460: validate_env_vars(sudo_user.env_vars);
461: }
462:
1.34 millert 463: log_allowed(validated);
1.38 millert 464: if (ISSET(sudo_mode, MODE_CHECK))
1.34 millert 465: rc = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
1.38 millert 466: else if (ISSET(sudo_mode, MODE_LIST))
1.34 millert 467: display_privs(snl, list_pw ? list_pw : sudo_user.pw);
468:
469: /* Cleanup sudoers sources */
470: tq_foreach_fwd(snl, nss)
471: nss->close(nss);
472:
473: /* Deferred exit due to sudo_ldap_close() */
1.38 millert 474: if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST)))
1.34 millert 475: exit(rc);
476:
477: /*
1.38 millert 478: * Set umask based on sudoers.
479: * If user's umask is more restrictive, OR in those bits too
480: * unless umask_override is set.
1.34 millert 481: */
482: if (def_umask != 0777) {
1.38 millert 483: if (def_umask_override) {
484: umask(def_umask);
485: } else {
486: mode_t mask = umask(def_umask);
487: mask |= def_umask;
488: if (mask != def_umask)
489: umask(mask);
490: }
1.1 millert 491: }
492:
1.4 millert 493: /* Restore coredumpsize resource limit. */
494: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
495: (void) setrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 496: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.4 millert 497:
1.39 millert 498: /* Must audit before uid change. */
499: audit_success(NewArgv);
500:
1.23 millert 501: /* Become specified user or root if executing a command. */
502: if (ISSET(sudo_mode, MODE_RUN))
503: set_perms(PERM_FULL_RUNAS);
1.16 millert 504:
1.23 millert 505: if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
506: char *p;
507:
508: /* Convert /bin/sh -> -sh so shell knows it is a login shell */
509: if ((p = strrchr(NewArgv[0], '/')) == NULL)
510: p = NewArgv[0];
511: *p = '-';
512: NewArgv[0] = p;
513:
514: /* Change to target user's homedir. */
515: if (chdir(runas_pw->pw_dir) == -1)
1.34 millert 516: warning("unable to change directory to %s", runas_pw->pw_dir);
517:
518: #if defined(__linux__) || defined(_AIX)
519: /* Insert system-wide environment variables. */
520: read_env_file(_PATH_ENVIRONMENT, TRUE);
521: #endif
1.23 millert 522: }
523:
524: if (ISSET(sudo_mode, MODE_EDIT))
1.27 millert 525: exit(sudo_edit(NewArgc, NewArgv, envp));
526:
1.34 millert 527: /* Insert system-wide environment variables. */
528: if (def_env_file)
529: read_env_file(def_env_file, FALSE);
530:
1.27 millert 531: /* Insert user-specified environment variables. */
1.34 millert 532: insert_env_vars(sudo_user.env_vars);
1.23 millert 533:
1.17 millert 534: /* Restore signal handlers before we exec. */
535: (void) sigaction(SIGINT, &saved_sa_int, NULL);
536: (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
537: (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
538:
1.34 millert 539: /* Close the password and group files and free up memory. */
540: sudo_endpwent();
541: sudo_endgrent();
542:
543: closefrom(def_closefrom + 1);
544:
1.1 millert 545: #ifndef PROFILING
1.38 millert 546: if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0) {
547: syslog(LOG_AUTH|LOG_ERR, "fork");
1.1 millert 548: exit(0);
1.38 millert 549: } else {
1.33 millert 550: #ifdef HAVE_SELINUX
551: if (is_selinux_enabled() > 0 && user_role != NULL)
1.34 millert 552: selinux_exec(user_role, user_type, NewArgv,
1.33 millert 553: ISSET(sudo_mode, MODE_LOGIN_SHELL));
554: #endif
1.34 millert 555: execv(safe_cmnd, NewArgv);
1.33 millert 556: }
1.1 millert 557: #else
558: exit(0);
559: #endif /* PROFILING */
560: /*
1.34 millert 561: * If we got here then execve() failed...
1.1 millert 562: */
1.27 millert 563: if (errno == ENOEXEC) {
564: NewArgv--; /* at least one extra slot... */
565: NewArgv[0] = "sh";
566: NewArgv[1] = safe_cmnd;
1.34 millert 567: execv(_PATH_BSHELL, NewArgv);
1.38 millert 568: }
569: warning("unable to execute %s", safe_cmnd);
1.11 millert 570: exit(127);
1.34 millert 571: } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
1.38 millert 572: audit_failure(NewArgv, "No user or host");
1.34 millert 573: log_denial(validated, 1);
1.1 millert 574: exit(1);
1.34 millert 575: } else {
1.23 millert 576: if (def_path_info) {
1.1 millert 577: /*
578: * We'd like to not leak path info at all here, but that can
579: * *really* confuse the users. To really close the leak we'd
580: * have to say "not allowed to run foo" even when the problem
581: * is just "no foo in path" since the user can trivially set
582: * their path to just contain a single dir.
583: */
1.34 millert 584: log_denial(validated,
1.1 millert 585: !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
586: if (cmnd_status == NOT_FOUND)
1.34 millert 587: warningx("%s: command not found", user_cmnd);
1.1 millert 588: else if (cmnd_status == NOT_FOUND_DOT)
1.34 millert 589: warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
1.1 millert 590: } else {
591: /* Just tell the user they are not allowed to run foo. */
1.34 millert 592: log_denial(validated, 1);
1.1 millert 593: }
1.38 millert 594: audit_failure(NewArgv, "validation failure");
1.1 millert 595: exit(1);
596: }
597: exit(0); /* not reached */
598: }
599:
600: /*
601: * Initialize timezone, set umask, fill in ``sudo_user'' struct and
602: * load the ``interfaces'' array.
603: */
1.34 millert 604: static void
1.27 millert 605: init_vars(sudo_mode, envp)
1.1 millert 606: int sudo_mode;
1.27 millert 607: char **envp;
1.1 millert 608: {
1.34 millert 609: char *p, **ep, thost[MAXHOSTNAMELEN + 1];
610: int nohostname;
1.1 millert 611:
612: /* Sanity check command from user. */
1.23 millert 613: if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
1.34 millert 614: errorx(1, "%s: File name too long", NewArgv[0]);
1.1 millert 615:
616: #ifdef HAVE_TZSET
617: (void) tzset(); /* set the timezone if applicable */
618: #endif /* HAVE_TZSET */
619:
620: /* Default value for cmnd and cwd, overridden later. */
621: if (user_cmnd == NULL)
622: user_cmnd = NewArgv[0];
1.17 millert 623: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 624:
625: /*
626: * We avoid gethostbyname() if possible since we don't want
627: * sudo to block if DNS or NIS is hosed.
628: * "host" is the (possibly fully-qualified) hostname and
629: * "shost" is the unqualified form of the hostname.
630: */
1.11 millert 631: nohostname = gethostname(thost, sizeof(thost));
632: if (nohostname)
633: user_host = user_shost = "localhost";
634: else {
1.34 millert 635: thost[sizeof(thost) - 1] = '\0';
1.1 millert 636: user_host = estrdup(thost);
1.23 millert 637: if (def_fqdn) {
1.11 millert 638: /* Defer call to set_fqdn() until log_error() is safe. */
639: user_shost = user_host;
1.1 millert 640: } else {
1.11 millert 641: if ((p = strchr(user_host, '.'))) {
642: *p = '\0';
643: user_shost = estrdup(user_host);
644: *p = '.';
645: } else {
646: user_shost = user_host;
647: }
1.1 millert 648: }
649: }
650:
1.40 ! millert 651: if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO)) ||
! 652: (p = ttyname(STDERR_FILENO))) {
1.30 millert 653: user_tty = user_ttypath = estrdup(p);
654: if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
655: user_tty += sizeof(_PATH_DEV) - 1;
1.1 millert 656: } else
657: user_tty = "unknown";
658:
1.27 millert 659: for (ep = envp; *ep; ep++) {
1.34 millert 660: /* XXX - don't fill in if empty string */
1.27 millert 661: switch (**ep) {
1.34 millert 662: case 'D':
663: if (strncmp("DISPLAY=", *ep, 8) == 0)
664: user_display = *ep + 8;
665: break;
666: case 'K':
667: if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
668: user_ccname = *ep + 11;
669: break;
1.27 millert 670: case 'P':
671: if (strncmp("PATH=", *ep, 5) == 0)
672: user_path = *ep + 5;
673: break;
674: case 'S':
675: if (strncmp("SHELL=", *ep, 6) == 0)
676: user_shell = *ep + 6;
677: else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
678: user_prompt = *ep + 12;
679: else if (strncmp("SUDO_USER=", *ep, 10) == 0)
680: prev_user = *ep + 10;
1.34 millert 681: else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
682: user_askpass = *ep + 13;
1.27 millert 683: break;
684: }
685: }
686:
1.1 millert 687: /*
688: * Get a local copy of the user's struct passwd with the shadow password
689: * if necessary. It is assumed that euid is 0 at this point so we
690: * can read the shadow passwd file if necessary.
691: */
692: if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
693: /* Need to make a fake struct passwd for logging to work. */
694: struct passwd pw;
695: char pw_name[MAX_UID_T_LEN + 1];
696:
697: pw.pw_uid = getuid();
1.17 millert 698: (void) snprintf(pw_name, sizeof(pw_name), "%lu",
699: (unsigned long) pw.pw_uid);
1.1 millert 700: pw.pw_name = pw_name;
701: sudo_user.pw = &pw;
702:
1.21 millert 703: /*
704: * If we are in -k/-K mode, just spew to stderr. It is not unusual for
705: * users to place "sudo -k" in a .logout file which can cause sudo to
706: * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
707: */
1.38 millert 708: if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE)
1.34 millert 709: errorx(1, "unknown uid: %s", pw_name);
710: log_error(0, "unknown uid: %s", pw_name);
1.1 millert 711: }
1.15 millert 712: if (user_shell == NULL || *user_shell == '\0')
1.34 millert 713: user_shell = estrdup(sudo_user.pw->pw_shell);
1.1 millert 714:
715: /* It is now safe to use log_error() and set_perms() */
716:
1.27 millert 717: #ifdef HAVE_GETGROUPS
718: if ((user_ngroups = getgroups(0, NULL)) > 0) {
1.31 millert 719: user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
1.27 millert 720: if (getgroups(user_ngroups, user_groups) < 0)
721: log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
722: } else
723: user_ngroups = 0;
724: #endif
725:
1.23 millert 726: if (def_fqdn)
727: set_fqdn(); /* may call log_error() */
1.11 millert 728:
729: if (nohostname)
730: log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
731:
732: /*
1.1 millert 733: * Get current working directory. Try as user, fall back to root.
734: */
1.17 millert 735: set_perms(PERM_USER);
1.1 millert 736: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.17 millert 737: set_perms(PERM_ROOT);
1.1 millert 738: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.34 millert 739: warningx("cannot get working directory");
1.17 millert 740: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 741: }
742: } else
1.17 millert 743: set_perms(PERM_ROOT);
1.1 millert 744:
745: /*
1.23 millert 746: * If we were given the '-e', '-i' or '-s' options we need to redo
1.1 millert 747: * NewArgv and NewArgc.
748: */
1.34 millert 749: if (ISSET(sudo_mode, MODE_EDIT)) {
750: NewArgv--;
751: NewArgc++;
752: NewArgv[0] = "sudoedit";
753: } else if (ISSET(sudo_mode, MODE_SHELL)) {
754: char **av;
1.1 millert 755:
1.27 millert 756: /* Allocate an extra slot for execve() failure (ENOEXEC). */
1.34 millert 757: av = (char **) emalloc2(5, sizeof(char *));
758: av++;
1.1 millert 759:
1.34 millert 760: av[0] = user_shell; /* may be updated later */
761: if (NewArgc > 0) {
762: size_t size;
763: char *cmnd, *src, *dst, *end;
764: size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[0]) +
765: strlen(NewArgv[NewArgc - 1]) + 1;
766: cmnd = emalloc(size);
767: src = NewArgv[0];
768: dst = cmnd;
769: for (end = src + size - 1; src < end; src++, dst++)
770: *dst = *src == 0 ? ' ' : *src;
771: *dst = '\0';
772: av[1] = "-c";
773: av[2] = cmnd;
774: NewArgc = 2;
775: }
776: av[++NewArgc] = NULL;
777: NewArgv = av;
1.1 millert 778: }
1.34 millert 779: }
1.1 millert 780:
1.34 millert 781: /*
782: * Fill in user_cmnd, user_args, user_base and user_stat variables
783: * and apply any command-specific defaults entries.
784: */
785: static int
786: set_cmnd(sudo_mode)
787: int sudo_mode;
788: {
789: int rval;
1.8 millert 790:
1.27 millert 791: /* Set project if applicable. */
792: set_project(runas_pw);
793:
1.1 millert 794: /* Resolve the path and return. */
1.23 millert 795: rval = FOUND;
796: user_stat = emalloc(sizeof(struct stat));
1.34 millert 797: if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
798: if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
1.23 millert 799: set_perms(PERM_RUNAS);
800: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
1.17 millert 801: set_perms(PERM_ROOT);
1.23 millert 802: if (rval != FOUND) {
803: /* Failed as root, try as invoking user. */
804: set_perms(PERM_USER);
805: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
806: set_perms(PERM_ROOT);
807: }
1.11 millert 808: }
809:
810: /* set user_args */
811: if (NewArgc > 1) {
812: char *to, **from;
1.17 millert 813: size_t size, n;
1.11 millert 814:
1.23 millert 815: /* If we didn't realloc NewArgv it is contiguous so just count. */
1.34 millert 816: if (!ISSET(sudo_mode, MODE_SHELL)) {
1.11 millert 817: size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
818: strlen(NewArgv[NewArgc-1]) + 1;
819: } else {
820: for (size = 0, from = NewArgv + 1; *from; from++)
821: size += strlen(*from) + 1;
822: }
823:
1.23 millert 824: /* Alloc and build up user_args. */
1.17 millert 825: user_args = (char *) emalloc(size);
826: for (to = user_args, from = NewArgv + 1; *from; from++) {
827: n = strlcpy(to, *from, size - (to - user_args));
1.19 millert 828: if (n >= size - (to - user_args))
1.34 millert 829: errorx(1, "internal error, init_vars() overflow");
1.17 millert 830: to += n;
1.11 millert 831: *to++ = ' ';
832: }
833: *--to = '\0';
834: }
1.23 millert 835: }
836: if ((user_base = strrchr(user_cmnd, '/')) != NULL)
837: user_base++;
838: else
839: user_base = user_cmnd;
1.11 millert 840:
1.34 millert 841: if (!update_defaults(SETDEF_CMND))
842: log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
843:
1.39 millert 844: if (!runas_user && !runas_group)
1.38 millert 845: set_runaspw(def_runas_default); /* may have been updated above */
846:
1.11 millert 847: return(rval);
1.1 millert 848: }
849:
850: /*
1.34 millert 851: * Command line argument parsing.
852: * Sets NewArgc and NewArgv which corresponds to the argc/argv we'll use
853: * for the command to be run (if we are running one).
1.1 millert 854: */
855: static int
1.19 millert 856: parse_args(argc, argv)
857: int argc;
858: char **argv;
1.1 millert 859: {
1.34 millert 860: int mode = 0; /* what mode is sudo to be run in? */
861: int flags = 0; /* mode flags */
1.38 millert 862: int valid_flags, ch;
1.1 millert 863:
1.23 millert 864: /* First, check to see if we were invoked as "sudoedit". */
1.34 millert 865: if (strcmp(getprogname(), "sudoedit") == 0)
866: mode = MODE_EDIT;
1.23 millert 867:
1.34 millert 868: /* Returns true if the last option string was "--" */
869: #define got_end_of_args (optind > 1 && argv[optind - 1][0] == '-' && \
870: argv[optind - 1][1] == '-' && argv[optind - 1][2] == '\0')
871:
872: /* Returns true if next option is an environment variable */
873: #define is_envar (optind < argc && argv[optind][0] != '/' && \
874: strchr(argv[optind], '=') != NULL)
1.27 millert 875:
1.38 millert 876: /* Flags allowed when running a command */
877: valid_flags = MODE_BACKGROUND|MODE_PRESERVE_ENV|MODE_RESET_HOME|
878: MODE_LOGIN_SHELL|MODE_INVALIDATE|MODE_NONINTERACTIVE|
879: MODE_PRESERVE_GROUPS|MODE_SHELL;
1.34 millert 880: for (;;) {
881: /*
882: * We disable arg permutation for GNU getopt().
883: * Some trickiness is required to allow environment variables
884: * to be interspersed with command line options.
885: */
886: if ((ch = getopt(argc, argv, "+Aa:bC:c:Eeg:HhiKkLlnPp:r:Sst:U:u:Vv")) != -1) {
887: switch (ch) {
888: case 'A':
889: SET(tgetpass_flags, TGP_ASKPASS);
1.27 millert 890: break;
1.8 millert 891: #ifdef HAVE_BSD_AUTH_H
1.27 millert 892: case 'a':
1.34 millert 893: login_style = optarg;
894: break;
895: #endif
896: case 'b':
897: SET(flags, MODE_BACKGROUND);
898: break;
899: case 'C':
900: if ((user_closefrom = atoi(optarg)) < 3) {
901: warningx("the argument to -C must be at least 3");
1.27 millert 902: usage(1);
1.34 millert 903: }
1.27 millert 904: break;
1.8 millert 905: #ifdef HAVE_LOGIN_CAP_H
1.27 millert 906: case 'c':
1.34 millert 907: login_class = optarg;
1.27 millert 908: def_use_loginclass = TRUE;
909: break;
1.4 millert 910: #endif
1.34 millert 911: case 'E':
912: SET(flags, MODE_PRESERVE_ENV);
1.27 millert 913: break;
914: case 'e':
1.34 millert 915: if (mode && mode != MODE_EDIT)
1.27 millert 916: usage_excl(1);
1.34 millert 917: mode = MODE_EDIT;
1.38 millert 918: valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
1.34 millert 919: break;
920: case 'g':
921: runas_group = optarg;
922: break;
923: case 'H':
924: SET(flags, MODE_RESET_HOME);
1.27 millert 925: break;
1.34 millert 926: case 'h':
1.38 millert 927: if (mode && mode != MODE_HELP) {
928: if (strcmp(getprogname(), "sudoedit") != 0)
929: usage_excl(1);
930: }
1.34 millert 931: mode = MODE_HELP;
1.38 millert 932: valid_flags = 0;
1.27 millert 933: break;
934: case 'i':
1.34 millert 935: SET(flags, MODE_LOGIN_SHELL);
1.27 millert 936: def_env_reset = TRUE;
937: break;
938: case 'k':
1.38 millert 939: SET(flags, MODE_INVALIDATE);
1.27 millert 940: break;
941: case 'K':
1.34 millert 942: if (mode && mode != MODE_KILL)
1.27 millert 943: usage_excl(1);
1.34 millert 944: mode = MODE_KILL;
1.38 millert 945: valid_flags = 0;
1.27 millert 946: break;
947: case 'L':
1.34 millert 948: if (mode && mode != MODE_LISTDEFS)
1.27 millert 949: usage_excl(1);
1.34 millert 950: mode = MODE_LISTDEFS;
1.38 millert 951: valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
1.27 millert 952: break;
953: case 'l':
1.34 millert 954: if (mode) {
955: if (mode == MODE_LIST)
956: long_list = 1;
957: else
958: usage_excl(1);
959: }
960: mode = MODE_LIST;
1.38 millert 961: valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
1.27 millert 962: break;
1.34 millert 963: case 'n':
964: SET(flags, MODE_NONINTERACTIVE);
1.27 millert 965: break;
1.34 millert 966: case 'P':
967: SET(flags, MODE_PRESERVE_GROUPS);
1.27 millert 968: break;
1.34 millert 969: case 'p':
970: user_prompt = optarg;
971: def_passprompt_override = TRUE;
1.27 millert 972: break;
1.34 millert 973: #ifdef HAVE_SELINUX
974: case 'r':
975: user_role = optarg;
1.27 millert 976: break;
1.34 millert 977: case 't':
978: user_type = optarg;
1.27 millert 979: break;
1.34 millert 980: #endif
1.27 millert 981: case 'S':
982: SET(tgetpass_flags, TGP_STDIN);
983: break;
1.34 millert 984: case 's':
985: SET(flags, MODE_SHELL);
986: break;
987: case 'U':
988: if ((list_pw = sudo_getpwnam(optarg)) == NULL)
989: errorx(1, "unknown user: %s", optarg);
990: break;
991: case 'u':
992: runas_user = optarg;
1.27 millert 993: break;
1.34 millert 994: case 'v':
995: if (mode && mode != MODE_VALIDATE)
996: usage_excl(1);
997: mode = MODE_VALIDATE;
1.38 millert 998: valid_flags = MODE_INVALIDATE|MODE_NONINTERACTIVE;
1.33 millert 999: break;
1.34 millert 1000: case 'V':
1001: if (mode && mode != MODE_VERSION)
1002: usage_excl(1);
1003: mode = MODE_VERSION;
1.38 millert 1004: valid_flags = 0;
1.33 millert 1005: break;
1.27 millert 1006: default:
1007: usage(1);
1008: }
1.34 millert 1009: } else if (!got_end_of_args && is_envar) {
1.27 millert 1010: struct list_member *ev;
1.34 millert 1011:
1012: /* Store environment variable. */
1.27 millert 1013: ev = emalloc(sizeof(*ev));
1.34 millert 1014: ev->value = argv[optind];
1.27 millert 1015: ev->next = sudo_user.env_vars;
1016: sudo_user.env_vars = ev;
1.34 millert 1017:
1018: /* Crank optind and resume getopt. */
1019: optind++;
1.27 millert 1020: } else {
1.34 millert 1021: /* Not an option or an environment variable -- we're done. */
1.27 millert 1022: break;
1.1 millert 1023: }
1024: }
1.27 millert 1025:
1.34 millert 1026: NewArgc = argc - optind;
1027: NewArgv = argv + optind;
1028:
1.38 millert 1029: if (!mode) {
1030: /* Defer -k mode setting until we know whether it is a flag or not */
1031: if (ISSET(flags, MODE_INVALIDATE) && NewArgc == 0) {
1032: mode = MODE_INVALIDATE; /* -k by itself */
1033: CLR(flags, MODE_INVALIDATE);
1034: valid_flags = 0;
1035: } else {
1036: mode = MODE_RUN; /* running a command */
1037: }
1038: }
1.34 millert 1039:
1040: if (NewArgc > 0 && mode == MODE_LIST)
1041: mode = MODE_CHECK;
1042:
1043: if (ISSET(flags, MODE_LOGIN_SHELL)) {
1044: if (ISSET(flags, MODE_SHELL)) {
1045: warningx("you may not specify both the `-i' and `-s' options");
1046: usage(1);
1047: }
1048: if (ISSET(flags, MODE_PRESERVE_ENV)) {
1049: warningx("you may not specify both the `-i' and `-E' options");
1050: usage(1);
1051: }
1052: SET(flags, MODE_SHELL);
1053: }
1.38 millert 1054: if ((flags & valid_flags) != flags)
1055: usage(1);
1.34 millert 1056: if (mode == MODE_EDIT &&
1057: (ISSET(flags, MODE_PRESERVE_ENV) || sudo_user.env_vars != NULL)) {
1058: if (ISSET(mode, MODE_PRESERVE_ENV))
1059: warningx("the `-E' option is not valid in edit mode");
1.27 millert 1060: if (sudo_user.env_vars != NULL)
1.34 millert 1061: warningx("you may not specify environment variables in edit mode");
1062: usage(1);
1063: }
1064: if ((runas_user != NULL || runas_group != NULL) &&
1065: !ISSET(mode, MODE_EDIT | MODE_RUN | MODE_CHECK)) {
1.27 millert 1066: usage(1);
1067: }
1.34 millert 1068: if (list_pw != NULL && mode != MODE_LIST && mode != MODE_CHECK) {
1069: warningx("the `-U' option may only be used with the `-l' option");
1.33 millert 1070: usage(1);
1071: }
1.34 millert 1072: if (ISSET(tgetpass_flags, TGP_STDIN) && ISSET(tgetpass_flags, TGP_ASKPASS)) {
1073: warningx("the `-A' and `-S' options may not be used together");
1.24 millert 1074: usage(1);
1075: }
1.34 millert 1076: if ((NewArgc == 0 && mode == MODE_EDIT) ||
1077: (NewArgc > 0 && !ISSET(mode, MODE_RUN | MODE_EDIT | MODE_CHECK)))
1.1 millert 1078: usage(1);
1.34 millert 1079: if (NewArgc == 0 && mode == MODE_RUN && !ISSET(flags, MODE_SHELL))
1080: SET(flags, (MODE_IMPLIED_SHELL | MODE_SHELL));
1.1 millert 1081:
1.34 millert 1082: return(mode | flags);
1.1 millert 1083: }
1084:
1085: /*
1.34 millert 1086: * Open sudoers and sanity check mode/owner/type.
1087: * Returns a handle to the sudoers file or NULL on error.
1.1 millert 1088: */
1.34 millert 1089: FILE *
1.39 millert 1090: open_sudoers(sudoers, doedit, keepopen)
1.34 millert 1091: const char *sudoers;
1.39 millert 1092: int doedit;
1.34 millert 1093: int *keepopen;
1.1 millert 1094: {
1095: struct stat statbuf;
1.34 millert 1096: FILE *fp = NULL;
1097: int rootstat;
1.1 millert 1098:
1099: /*
1100: * Fix the mode and group on sudoers file from old default.
1.23 millert 1101: * Only works if file system is readable/writable by root.
1.1 millert 1102: */
1.34 millert 1103: if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
1.1 millert 1104: SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
1105: (statbuf.st_mode & 0007777) == 0400) {
1106:
1.34 millert 1107: if (chmod(sudoers, SUDOERS_MODE) == 0) {
1108: warningx("fixed mode on %s", sudoers);
1.23 millert 1109: SET(statbuf.st_mode, SUDOERS_MODE);
1.1 millert 1110: if (statbuf.st_gid != SUDOERS_GID) {
1.34 millert 1111: if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
1112: warningx("set group on %s", sudoers);
1.1 millert 1113: statbuf.st_gid = SUDOERS_GID;
1.19 millert 1114: } else
1.34 millert 1115: warning("unable to set group on %s", sudoers);
1.1 millert 1116: }
1.19 millert 1117: } else
1.34 millert 1118: warning("unable to fix mode on %s", sudoers);
1.1 millert 1119: }
1120:
1121: /*
1122: * Sanity checks on sudoers file. Must be done as sudoers
1123: * file owner. We already did a stat as root, so use that
1124: * data if we can't stat as sudoers file owner.
1125: */
1.17 millert 1126: set_perms(PERM_SUDOERS);
1.1 millert 1127:
1.34 millert 1128: if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
1129: log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
1.1 millert 1130: else if (!S_ISREG(statbuf.st_mode))
1.34 millert 1131: log_error(NO_EXIT, "%s is not a regular file", sudoers);
1.1 millert 1132: else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
1.34 millert 1133: log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
1.27 millert 1134: (unsigned int) (statbuf.st_mode & 07777),
1135: (unsigned int) SUDOERS_MODE);
1.1 millert 1136: else if (statbuf.st_uid != SUDOERS_UID)
1.34 millert 1137: log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
1.25 millert 1138: (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1.1 millert 1139: else if (statbuf.st_gid != SUDOERS_GID)
1.34 millert 1140: log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
1.25 millert 1141: (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1.34 millert 1142: else if ((fp = fopen(sudoers, "r")) == NULL)
1.40 ! millert 1143: log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers);
1.37 millert 1144: else {
1.34 millert 1145: /*
1146: * Make sure we can actually read sudoers so we can present the
1.37 millert 1147: * user with a reasonable error message (unlike the lexer).
1.34 millert 1148: */
1.40 ! millert 1149: if (statbuf.st_size != 0 && fgetc(fp) == EOF) {
! 1150: log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers);
! 1151: fclose(fp);
! 1152: fp = NULL;
1.37 millert 1153: }
1.40 ! millert 1154: }
! 1155:
! 1156: if (fp != NULL) {
! 1157: rewind(fp);
1.37 millert 1158: (void) fcntl(fileno(fp), F_SETFD, 1);
1.1 millert 1159: }
1160:
1.17 millert 1161: set_perms(PERM_ROOT); /* change back to root */
1.34 millert 1162: return(fp);
1.1 millert 1163: }
1164:
1165: /*
1166: * Close all open files (except std*) and turn off core dumps.
1.34 millert 1167: * Also sets the set_perms() pointer to the correct function.
1.1 millert 1168: */
1169: static void
1170: initial_setup()
1171: {
1.27 millert 1172: int miss[3], devnull = -1;
1.33 millert 1173: #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1.1 millert 1174: struct rlimit rl;
1.33 millert 1175: #endif
1.1 millert 1176:
1.33 millert 1177: #if defined(__linux__)
1178: /*
1179: * Unlimit the number of processes since Linux's setuid() will
1180: * apply resource limits when changing uid and return EAGAIN if
1181: * nproc would be violated by the uid switch.
1182: */
1183: rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1184: if (setrlimit(RLIMIT_NPROC, &rl)) {
1185: if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
1186: rl.rlim_cur = rl.rlim_max;
1187: (void)setrlimit(RLIMIT_NPROC, &rl);
1188: }
1189: }
1190: #endif /* __linux__ */
1191: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1.1 millert 1192: /*
1193: * Turn off core dumps.
1194: */
1.4 millert 1195: (void) getrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 1196: memcpy(&rl, &corelimit, sizeof(struct rlimit));
1197: rl.rlim_cur = 0;
1.1 millert 1198: (void) setrlimit(RLIMIT_CORE, &rl);
1.20 millert 1199: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.1 millert 1200:
1.17 millert 1201: /*
1.27 millert 1202: * stdin, stdout and stderr must be open; set them to /dev/null
1203: * if they are closed and close all other fds.
1.17 millert 1204: */
1.27 millert 1205: miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1206: miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1207: miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1208: if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1209: if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
1210: if (miss[STDIN_FILENO])
1211: (void) dup2(devnull, STDIN_FILENO);
1212: if (miss[STDOUT_FILENO])
1213: (void) dup2(devnull, STDOUT_FILENO);
1214: if (miss[STDERR_FILENO])
1215: (void) dup2(devnull, STDERR_FILENO);
1.34 millert 1216: if (devnull > STDERR_FILENO)
1217: close(devnull);
1.27 millert 1218: }
1219: }
1.1 millert 1220: }
1221:
1.8 millert 1222: #ifdef HAVE_LOGIN_CAP_H
1223: static void
1.4 millert 1224: set_loginclass(pw)
1225: struct passwd *pw;
1226: {
1227: int errflags;
1228:
1229: /*
1230: * Don't make it a fatal error if the user didn't specify the login
1231: * class themselves. We do this because if login.conf gets
1232: * corrupted we want the admin to be able to use sudo to fix it.
1233: */
1234: if (login_class)
1235: errflags = NO_MAIL|MSG_ONLY;
1236: else
1237: errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1238:
1239: if (login_class && strcmp(login_class, "-") != 0) {
1.34 millert 1240: if (user_uid != 0 &&
1241: strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
1242: errorx(1, "only root can use -c %s", login_class);
1.4 millert 1243: } else {
1244: login_class = pw->pw_class;
1245: if (!login_class || !*login_class)
1246: login_class =
1247: (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1248: }
1249:
1250: lc = login_getclass(login_class);
1.10 millert 1251: if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1.4 millert 1252: log_error(errflags, "unknown login class: %s", login_class);
1.11 millert 1253: if (!lc)
1254: lc = login_getclass(NULL); /* needed for login_getstyle() later */
1.10 millert 1255: }
1.4 millert 1256: }
1257: #else
1.8 millert 1258: static void
1.4 millert 1259: set_loginclass(pw)
1260: struct passwd *pw;
1261: {
1262: }
1.8 millert 1263: #endif /* HAVE_LOGIN_CAP_H */
1.4 millert 1264:
1.27 millert 1265: #ifdef HAVE_PROJECT_H
1266: static void
1267: set_project(pw)
1268: struct passwd *pw;
1269: {
1270: int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1271: int errval;
1272: struct project proj;
1273: struct project *resultp = '\0';
1274: char buf[1024];
1275:
1276: /*
1277: * Collect the default project for the user and settaskid
1278: */
1279: setprojent();
1280: if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1281: errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1282: if (errval != 0) {
1283: switch(errval) {
1284: case SETPROJ_ERR_TASK:
1285: if (errno == EAGAIN)
1286: log_error(errflags, "resource control limit has been reached");
1287: else if (errno == ESRCH)
1288: log_error(errflags, "user \"%s\" is not a member of "
1289: "project \"%s\"", pw->pw_name, resultp->pj_name);
1290: else if (errno == EACCES)
1291: log_error(errflags, "the invoking task is final");
1292: else
1293: log_error(errflags, "could not join project \"%s\"",
1294: resultp->pj_name);
1295: break;
1296: case SETPROJ_ERR_POOL:
1297: if (errno == EACCES)
1298: log_error(errflags, "no resource pool accepting "
1299: "default bindings exists for project \"%s\"",
1300: resultp->pj_name);
1301: else if (errno == ESRCH)
1302: log_error(errflags, "specified resource pool does "
1303: "not exist for project \"%s\"", resultp->pj_name);
1304: else
1305: log_error(errflags, "could not bind to default "
1306: "resource pool for project \"%s\"", resultp->pj_name);
1307: break;
1308: default:
1309: if (errval <= 0) {
1310: log_error(errflags, "setproject failed for project \"%s\"",
1311: resultp->pj_name);
1312: } else {
1313: log_error(errflags, "warning, resource control assignment "
1314: "failed for project \"%s\"", resultp->pj_name);
1315: }
1316: }
1317: }
1318: } else {
1319: log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1320: }
1321: endprojent();
1322: }
1323: #else
1324: static void
1325: set_project(pw)
1326: struct passwd *pw;
1327: {
1328: }
1329: #endif /* HAVE_PROJECT_H */
1330:
1.1 millert 1331: /*
1.2 millert 1332: * Look up the fully qualified domain name and set user_host and user_shost.
1333: */
1334: void
1335: set_fqdn()
1336: {
1.28 millert 1337: #ifdef HAVE_GETADDRINFO
1338: struct addrinfo *res0, hint;
1339: #else
1.2 millert 1340: struct hostent *hp;
1.28 millert 1341: #endif
1.2 millert 1342: char *p;
1343:
1.28 millert 1344: #ifdef HAVE_GETADDRINFO
1.34 millert 1345: zero_bytes(&hint, sizeof(hint));
1.28 millert 1346: hint.ai_family = PF_UNSPEC;
1347: hint.ai_flags = AI_CANONNAME;
1348: if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1349: #else
1.14 millert 1350: if (!(hp = gethostbyname(user_host))) {
1.28 millert 1351: #endif
1.14 millert 1352: log_error(MSG_ONLY|NO_EXIT,
1.28 millert 1353: "unable to resolve host %s", user_host);
1.14 millert 1354: } else {
1355: if (user_shost != user_host)
1.27 millert 1356: efree(user_shost);
1357: efree(user_host);
1.28 millert 1358: #ifdef HAVE_GETADDRINFO
1359: user_host = estrdup(res0->ai_canonname);
1360: freeaddrinfo(res0);
1361: #else
1.14 millert 1362: user_host = estrdup(hp->h_name);
1.28 millert 1363: #endif
1.2 millert 1364: }
1365: if ((p = strchr(user_host, '.'))) {
1366: *p = '\0';
1367: user_shost = estrdup(user_host);
1368: *p = '.';
1369: } else {
1370: user_shost = user_host;
1371: }
1372: }
1373:
1374: /*
1.23 millert 1375: * Get passwd entry for the user we are going to run commands as.
1376: * By default, this is "root". Updates runas_pw as a side effect.
1377: */
1.34 millert 1378: static void
1.23 millert 1379: set_runaspw(user)
1380: char *user;
1381: {
1.34 millert 1382: if (*user == '#') {
1383: if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
1384: runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
1385: } else {
1.38 millert 1386: if ((runas_pw = sudo_getpwnam(user)) == NULL) {
1387: audit_failure(NewArgv, "unknown user: %s", user);
1.34 millert 1388: log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
1.38 millert 1389: }
1.23 millert 1390: }
1.34 millert 1391: }
1392:
1393: /*
1394: * Get group entry for the group we are going to run commands as.
1395: * Updates runas_pw as a side effect.
1396: */
1397: static void
1398: set_runasgr(group)
1399: char *group;
1400: {
1401: if (*group == '#') {
1402: if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
1403: runas_gr = sudo_fakegrnam(group);
1.23 millert 1404: } else {
1.34 millert 1405: if ((runas_gr = sudo_getgrnam(group)) == NULL)
1406: log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
1.23 millert 1407: }
1408: }
1409:
1410: /*
1.6 millert 1411: * Get passwd entry for the user we are going to authenticate as.
1.23 millert 1412: * By default, this is the user invoking sudo. In the most common
1413: * case, this matches sudo_user.pw or runas_pw.
1.4 millert 1414: */
1.6 millert 1415: static struct passwd *
1416: get_authpw()
1.4 millert 1417: {
1418: struct passwd *pw;
1419:
1.23 millert 1420: if (def_rootpw) {
1.34 millert 1421: if ((pw = sudo_getpwuid(0)) == NULL)
1422: log_error(0, "unknown uid: 0");
1.23 millert 1423: } else if (def_runaspw) {
1.34 millert 1424: if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1425: log_error(0, "unknown user: %s", def_runas_default);
1.23 millert 1426: } else if (def_targetpw) {
1427: if (runas_pw->pw_name == NULL)
1.34 millert 1428: log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
1.25 millert 1429: (unsigned long) runas_pw->pw_uid);
1.23 millert 1430: pw = runas_pw;
1.6 millert 1431: } else
1432: pw = sudo_user.pw;
1433:
1434: return(pw);
1.4 millert 1435: }
1436:
1437: /*
1.34 millert 1438: * Cleanup hook for error()/errorx()
1439: */
1440: void
1441: cleanup(gotsignal)
1442: int gotsignal;
1443: {
1444: struct sudo_nss *nss;
1445:
1446: if (!gotsignal) {
1447: if (snl != NULL) {
1448: tq_foreach_fwd(snl, nss)
1449: nss->close(nss);
1450: }
1451: sudo_endpwent();
1452: sudo_endgrent();
1453: }
1454: }
1455:
1456: static void
1457: show_version()
1458: {
1.39 millert 1459: (void) printf("Sudo version %s\n", PACKAGE_VERSION);
1.34 millert 1460: if (getuid() == 0) {
1461: putchar('\n');
1462: (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
1463: #ifdef HAVE_LDAP
1464: # ifdef _PATH_NSSWITCH_CONF
1465: (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
1466: # endif
1467: (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
1468: (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
1469: #endif
1470: dump_auth_methods();
1471: dump_defaults();
1472: dump_interfaces();
1473: }
1474: exit(0);
1475: }
1476:
1477: /*
1.1 millert 1478: * Tell which options are mutually exclusive and exit.
1479: */
1480: static void
1481: usage_excl(exit_val)
1482: int exit_val;
1483: {
1.38 millert 1484: warningx("Only one of the -e, -h, -i, -K, -l, -s, -v or -V options may be specified");
1.1 millert 1485: usage(exit_val);
1486: }
1487:
1488: /*
1489: * Give usage message and exit.
1.34 millert 1490: * The actual usage strings are in sudo_usage.h for configure substitution.
1.1 millert 1491: */
1492: static void
1493: usage(exit_val)
1494: int exit_val;
1495: {
1.34 millert 1496: struct lbuf lbuf;
1.38 millert 1497: char *uvec[6];
1.34 millert 1498: int i, ulen;
1.23 millert 1499:
1500: /*
1.27 millert 1501: * Use usage vectors appropriate to the progname.
1.23 millert 1502: */
1503: if (strcmp(getprogname(), "sudoedit") == 0) {
1.38 millert 1504: uvec[0] = SUDO_USAGE5 + 3;
1.27 millert 1505: uvec[1] = NULL;
1.23 millert 1506: } else {
1.34 millert 1507: uvec[0] = SUDO_USAGE1;
1508: uvec[1] = SUDO_USAGE2;
1509: uvec[2] = SUDO_USAGE3;
1510: uvec[3] = SUDO_USAGE4;
1.38 millert 1511: uvec[4] = SUDO_USAGE5;
1512: uvec[5] = NULL;
1.23 millert 1513: }
1514:
1515: /*
1.34 millert 1516: * Print usage and wrap lines as needed, depending on the
1517: * tty width.
1.23 millert 1518: */
1.34 millert 1519: ulen = (int)strlen(getprogname()) + 8;
1520: lbuf_init(&lbuf, NULL, ulen, 0);
1.27 millert 1521: for (i = 0; uvec[i] != NULL; i++) {
1.34 millert 1522: lbuf_append(&lbuf, "usage: ", getprogname(), uvec[i], NULL);
1523: lbuf_print(&lbuf);
1.23 millert 1524: }
1.34 millert 1525: lbuf_destroy(&lbuf);
1.1 millert 1526: exit(exit_val);
1527: }
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