Annotation of src/usr.bin/sudo/sudo.c, Revision 1.28
1.1 millert 1: /*
1.27 millert 2: * Copyright (c) 1993-1996,1998-2007 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 */
1.19 millert 62: #ifdef HAVE_ERR_H
63: # include <err.h>
64: #else
65: # include "emul/err.h"
66: #endif /* HAVE_ERR_H */
1.1 millert 67: #include <pwd.h>
68: #include <errno.h>
69: #include <fcntl.h>
70: #include <signal.h>
71: #include <grp.h>
1.27 millert 72: #if TIME_WITH_SYS_TIME
73: # include <time.h>
74: #endif
75: #ifdef HAVE_SETLOCALE
76: # include <locale.h>
77: #endif
1.1 millert 78: #include <netinet/in.h>
79: #include <netdb.h>
80: #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
81: # ifdef __hpux
82: # undef MAXINT
83: # include <hpsecurity.h>
84: # else
85: # include <sys/security.h>
86: # endif /* __hpux */
87: # include <prot.h>
88: #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
1.8 millert 89: #ifdef HAVE_LOGIN_CAP_H
1.4 millert 90: # include <login_cap.h>
91: # ifndef LOGIN_DEFROOTCLASS
92: # define LOGIN_DEFROOTCLASS "daemon"
93: # endif
94: #endif
1.27 millert 95: #ifdef HAVE_PROJECT_H
96: # include <project.h>
97: # include <sys/task.h>
98: #endif
1.1 millert 99:
100: #include "sudo.h"
101: #include "interfaces.h"
102: #include "version.h"
103:
104: #ifndef lint
1.28 ! millert 105: __unused __unused static const char rcsid[] = "$Sudo: sudo.c,v 1.369.2.29 2007/08/15 13:48:56 millert Exp $";
1.1 millert 106: #endif /* lint */
107:
108: /*
109: * Prototypes
110: */
1.27 millert 111: static int init_vars __P((int, char **));
1.19 millert 112: static int parse_args __P((int, char **));
1.11 millert 113: static void check_sudoers __P((void));
114: static void initial_setup __P((void));
115: static void set_loginclass __P((struct passwd *));
1.27 millert 116: static void set_project __P((struct passwd *));
117: static void usage __P((int))
118: __attribute__((__noreturn__));
119: static void usage_excl __P((int))
120: __attribute__((__noreturn__));
1.1 millert 121: static void usage_excl __P((int));
1.6 millert 122: static struct passwd *get_authpw __P((void));
1.27 millert 123: extern int sudo_edit __P((int, char **, char **));
1.11 millert 124: extern void list_matches __P((void));
1.23 millert 125: extern char **rebuild_env __P((char **, int, int));
1.27 millert 126: extern void validate_env_vars __P((struct list_member *));
127: extern char **insert_env_vars __P((char **, struct list_member *));
1.11 millert 128: extern struct passwd *sudo_getpwnam __P((const char *));
1.1 millert 129: extern struct passwd *sudo_getpwuid __P((uid_t));
1.23 millert 130: extern struct passwd *sudo_pwdup __P((const struct passwd *));
1.1 millert 131:
132: /*
133: * Globals
134: */
1.19 millert 135: int Argc, NewArgc;
136: char **Argv, **NewArgv;
1.23 millert 137: char *prev_user;
1.1 millert 138: struct sudo_user sudo_user;
1.6 millert 139: struct passwd *auth_pw;
1.19 millert 140: FILE *sudoers_fp;
1.1 millert 141: struct interface *interfaces;
142: int num_interfaces;
1.4 millert 143: int tgetpass_flags;
1.17 millert 144: uid_t timestamp_uid;
1.1 millert 145: extern int errorlineno;
1.4 millert 146: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
147: static struct rlimit corelimit;
1.20 millert 148: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.8 millert 149: #ifdef HAVE_LOGIN_CAP_H
150: login_cap_t *lc;
151: #endif /* HAVE_LOGIN_CAP_H */
152: #ifdef HAVE_BSD_AUTH_H
153: char *login_style;
154: #endif /* HAVE_BSD_AUTH_H */
1.23 millert 155: sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp, saved_sa_chld;
1.1 millert 156:
157:
158: int
1.11 millert 159: main(argc, argv, envp)
1.1 millert 160: int argc;
161: char **argv;
1.11 millert 162: char **envp;
1.1 millert 163: {
164: int validated;
165: int fd;
166: int cmnd_status;
167: int sudo_mode;
1.11 millert 168: int pwflag;
1.23 millert 169: sigaction_t sa;
1.11 millert 170: extern int printmatches;
1.1 millert 171: extern char **environ;
172:
1.27 millert 173: #ifdef HAVE_SETLOCALE
174: setlocale(LC_ALL, "");
175: #endif
176:
1.19 millert 177: Argv = argv;
1.23 millert 178: if ((Argc = argc) < 1)
179: usage(1);
1.19 millert 180:
1.1 millert 181: /* Must be done as the first thing... */
182: #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
1.19 millert 183: (void) set_auth_parameters(Argc, Argv);
1.1 millert 184: # ifdef HAVE_INITPRIVS
185: initprivs();
186: # endif
187: #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
188:
1.19 millert 189: if (geteuid() != 0)
190: errx(1, "must be setuid root");
1.1 millert 191:
192: /*
1.17 millert 193: * Signal setup:
194: * Ignore keyboard-generated signals so the user cannot interrupt
195: * us at some point and avoid the logging.
196: * Install handler to wait for children when they exit.
1.1 millert 197: */
1.11 millert 198: sigemptyset(&sa.sa_mask);
199: sa.sa_flags = SA_RESTART;
200: sa.sa_handler = SIG_IGN;
1.17 millert 201: (void) sigaction(SIGINT, &sa, &saved_sa_int);
202: (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
203: (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
204: sa.sa_handler = reapchild;
205: (void) sigaction(SIGCHLD, &sa, &saved_sa_chld);
1.1 millert 206:
207: /*
1.27 millert 208: * Turn off core dumps and close open files.
1.1 millert 209: */
210: initial_setup();
1.11 millert 211: setpwent();
1.1 millert 212:
213: /* Parse our arguments. */
1.19 millert 214: sudo_mode = parse_args(Argc, Argv);
1.1 millert 215:
216: /* Setup defaults data structures. */
217: init_defaults();
218:
1.11 millert 219: /* Load the list of local ip addresses and netmasks. */
220: load_interfaces();
221:
222: pwflag = 0;
1.23 millert 223: if (ISSET(sudo_mode, MODE_SHELL))
1.1 millert 224: user_cmnd = "shell";
1.23 millert 225: else if (ISSET(sudo_mode, MODE_EDIT))
226: user_cmnd = "sudoedit";
1.1 millert 227: else
228: switch (sudo_mode) {
229: case MODE_VERSION:
230: (void) printf("Sudo version %s\n", version);
231: if (getuid() == 0) {
232: putchar('\n');
1.27 millert 233: (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
1.1 millert 234: dump_auth_methods();
235: dump_defaults();
1.11 millert 236: dump_interfaces();
1.1 millert 237: }
238: exit(0);
239: break;
240: case MODE_HELP:
241: usage(0);
242: break;
243: case MODE_VALIDATE:
244: user_cmnd = "validate";
1.23 millert 245: pwflag = I_VERIFYPW;
1.1 millert 246: break;
247: case MODE_KILL:
248: case MODE_INVALIDATE:
249: user_cmnd = "kill";
1.11 millert 250: pwflag = -1;
1.1 millert 251: break;
252: case MODE_LISTDEFS:
253: list_options();
254: exit(0);
255: break;
256: case MODE_LIST:
257: user_cmnd = "list";
1.23 millert 258: pwflag = I_LISTPW;
1.1 millert 259: printmatches = 1;
260: break;
261: }
262:
263: /* Must have a command to run... */
264: if (user_cmnd == NULL && NewArgc == 0)
265: usage(1);
266:
1.27 millert 267: cmnd_status = init_vars(sudo_mode, environ);
1.1 millert 268:
1.23 millert 269: #ifdef HAVE_LDAP
270: validated = sudo_ldap_check(pwflag);
271:
272: /* Skip reading /etc/sudoers if LDAP told us to */
273: if (def_ignore_local_sudoers); /* skips */
274: else if (ISSET(validated, VALIDATE_OK) && !printmatches); /* skips */
275: else if (ISSET(validated, VALIDATE_OK) && printmatches)
276: {
277: check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
278:
279: /* User is found in LDAP and we want a list of all sudo commands the
280: * user can do, so consult sudoers but throw away result.
281: */
282: sudoers_lookup(pwflag);
283: }
284: else
285: #endif
286: {
287: check_sudoers(); /* check mode/owner on _PATH_SUDOERS */
1.1 millert 288:
1.23 millert 289: /* Validate the user but don't search for pseudo-commands. */
290: validated = sudoers_lookup(pwflag);
291: }
1.26 millert 292: if (safe_cmnd == NULL)
1.27 millert 293: safe_cmnd = estrdup(user_cmnd);
1.1 millert 294:
1.11 millert 295: /*
1.17 millert 296: * Look up the timestamp dir owner if one is specified.
297: */
1.23 millert 298: if (def_timestampowner) {
1.17 millert 299: struct passwd *pw;
300:
1.23 millert 301: if (*def_timestampowner == '#')
302: pw = getpwuid(atoi(def_timestampowner + 1));
1.17 millert 303: else
1.23 millert 304: pw = getpwnam(def_timestampowner);
1.17 millert 305: if (!pw)
306: log_error(0, "timestamp owner (%s): No such user",
1.23 millert 307: def_timestampowner);
1.17 millert 308: timestamp_uid = pw->pw_uid;
309: }
310:
1.2 millert 311: /* This goes after the sudoers parse since we honor sudoers options. */
1.1 millert 312: if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
313: remove_timestamp((sudo_mode == MODE_KILL));
314: exit(0);
315: }
316:
1.23 millert 317: if (ISSET(validated, VALIDATE_ERROR))
1.1 millert 318: log_error(0, "parse error in %s near line %d", _PATH_SUDOERS,
319: errorlineno);
320:
321: /* Is root even allowed to run sudo? */
1.23 millert 322: if (user_uid == 0 && !def_root_sudo) {
1.17 millert 323: (void) fprintf(stderr,
324: "Sorry, %s has been configured to not allow root to run it.\n",
1.19 millert 325: getprogname());
1.1 millert 326: exit(1);
327: }
328:
1.11 millert 329: /* If given the -P option, set the "preserve_groups" flag. */
1.23 millert 330: if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
331: def_preserve_groups = TRUE;
1.11 millert 332:
1.3 millert 333: /* If no command line args and "set_home" is not set, error out. */
1.23 millert 334: if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
1.3 millert 335: usage(1);
336:
1.1 millert 337: /* Bail if a tty is required and we don't have one. */
1.23 millert 338: if (def_requiretty) {
1.1 millert 339: if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1)
340: log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
341: else
342: (void) close(fd);
343: }
344:
1.27 millert 345: /* User may have overriden environment resetting via the -E flag. */
346: if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && ISSET(validated, FLAG_SETENV))
347: def_env_reset = FALSE;
348:
349: /* Build a new environment that avoids any nasty bits. */
350: environ = rebuild_env(environ, sudo_mode, ISSET(validated, FLAG_NOEXEC));
351:
1.6 millert 352: /* Fill in passwd struct based on user we are authenticating as. */
353: auth_pw = get_authpw();
1.4 millert 354:
1.23 millert 355: /* Require a password if sudoers says so. */
356: if (!ISSET(validated, FLAG_NOPASS))
1.27 millert 357: check_user(validated);
1.23 millert 358:
359: /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
360: if (user_uid == 0 && prev_user != NULL && strcmp(prev_user, "root") != 0) {
361: struct passwd *pw;
362:
363: if ((pw = sudo_getpwnam(prev_user)) != NULL) {
1.27 millert 364: efree(sudo_user.pw);
1.23 millert 365: sudo_user.pw = pw;
366: }
367: }
1.1 millert 368:
1.23 millert 369: if (ISSET(validated, VALIDATE_OK)) {
1.1 millert 370: /* Finally tell the user if the command did not exist. */
371: if (cmnd_status == NOT_FOUND_DOT) {
1.19 millert 372: warnx("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 373: exit(1);
374: } else if (cmnd_status == NOT_FOUND) {
1.19 millert 375: warnx("%s: command not found", user_cmnd);
1.1 millert 376: exit(1);
377: }
378:
1.27 millert 379: /* If user specified env vars make sure sudoers allows it. */
380: if (ISSET(sudo_mode, MODE_RUN) && !ISSET(validated, FLAG_SETENV)) {
381: if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
382: log_error(NO_MAIL,
383: "sorry, you are not allowed to preserve the environment");
384: else
385: validate_env_vars(sudo_user.env_vars);
386: }
387:
1.1 millert 388: log_auth(validated, 1);
389: if (sudo_mode == MODE_VALIDATE)
390: exit(0);
391: else if (sudo_mode == MODE_LIST) {
392: list_matches();
1.23 millert 393: #ifdef HAVE_LDAP
394: sudo_ldap_list_matches();
395: #endif
1.1 millert 396: exit(0);
397: }
398:
399: /* Override user's umask if configured to do so. */
1.23 millert 400: if (def_umask != 0777)
401: (void) umask(def_umask);
1.1 millert 402:
1.4 millert 403: /* Restore coredumpsize resource limit. */
404: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
405: (void) setrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 406: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.4 millert 407:
1.23 millert 408: /* Become specified user or root if executing a command. */
409: if (ISSET(sudo_mode, MODE_RUN))
410: set_perms(PERM_FULL_RUNAS);
1.16 millert 411:
412: /* Close the password and group files */
413: endpwent();
414: endgrent();
1.12 millert 415:
1.23 millert 416: if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
417: char *p;
418:
419: /* Convert /bin/sh -> -sh so shell knows it is a login shell */
420: if ((p = strrchr(NewArgv[0], '/')) == NULL)
421: p = NewArgv[0];
422: *p = '-';
423: NewArgv[0] = p;
424:
425: /* Change to target user's homedir. */
426: if (chdir(runas_pw->pw_dir) == -1)
427: warn("unable to change directory to %s", runas_pw->pw_dir);
428: }
429:
430: if (ISSET(sudo_mode, MODE_EDIT))
1.27 millert 431: exit(sudo_edit(NewArgc, NewArgv, envp));
432:
433: /* Insert user-specified environment variables. */
434: environ = insert_env_vars(environ, sudo_user.env_vars);
1.23 millert 435:
1.17 millert 436: /* Restore signal handlers before we exec. */
437: (void) sigaction(SIGINT, &saved_sa_int, NULL);
438: (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
439: (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
440: (void) sigaction(SIGCHLD, &saved_sa_chld, NULL);
441:
1.1 millert 442: #ifndef PROFILING
1.23 millert 443: if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0)
1.1 millert 444: exit(0);
445: else
1.27 millert 446: execve(safe_cmnd, NewArgv, environ);
1.1 millert 447: #else
448: exit(0);
449: #endif /* PROFILING */
450: /*
451: * If we got here then the exec() failed...
452: */
1.27 millert 453: if (errno == ENOEXEC) {
454: NewArgv--; /* at least one extra slot... */
455: NewArgv[0] = "sh";
456: NewArgv[1] = safe_cmnd;
457: execve(_PATH_BSHELL, NewArgv, environ);
458: }
1.19 millert 459: warn("unable to execute %s", safe_cmnd);
1.11 millert 460: exit(127);
1.23 millert 461: } else if (ISSET(validated, FLAG_NO_USER) || (validated & FLAG_NO_HOST)) {
1.1 millert 462: log_auth(validated, 1);
463: exit(1);
1.23 millert 464: } else if (ISSET(validated, VALIDATE_NOT_OK)) {
465: if (def_path_info) {
1.1 millert 466: /*
467: * We'd like to not leak path info at all here, but that can
468: * *really* confuse the users. To really close the leak we'd
469: * have to say "not allowed to run foo" even when the problem
470: * is just "no foo in path" since the user can trivially set
471: * their path to just contain a single dir.
472: */
473: log_auth(validated,
474: !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
475: if (cmnd_status == NOT_FOUND)
1.19 millert 476: warnx("%s: command not found", user_cmnd);
1.1 millert 477: else if (cmnd_status == NOT_FOUND_DOT)
1.19 millert 478: warnx("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 479: } else {
480: /* Just tell the user they are not allowed to run foo. */
481: log_auth(validated, 1);
482: }
483: exit(1);
484: } else {
485: /* should never get here */
486: log_auth(validated, 1);
487: exit(1);
488: }
489: exit(0); /* not reached */
490: }
491:
492: /*
493: * Initialize timezone, set umask, fill in ``sudo_user'' struct and
494: * load the ``interfaces'' array.
495: */
496: static int
1.27 millert 497: init_vars(sudo_mode, envp)
1.1 millert 498: int sudo_mode;
1.27 millert 499: char **envp;
1.1 millert 500: {
1.27 millert 501: char *p, **ep, thost[MAXHOSTNAMELEN];
1.11 millert 502: int nohostname, rval;
1.1 millert 503:
504: /* Sanity check command from user. */
1.23 millert 505: if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
1.19 millert 506: errx(1, "%s: File name too long", NewArgv[0]);
1.1 millert 507:
508: #ifdef HAVE_TZSET
509: (void) tzset(); /* set the timezone if applicable */
510: #endif /* HAVE_TZSET */
511:
512: /* Default value for cmnd and cwd, overridden later. */
513: if (user_cmnd == NULL)
514: user_cmnd = NewArgv[0];
1.17 millert 515: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 516:
517: /*
518: * We avoid gethostbyname() if possible since we don't want
519: * sudo to block if DNS or NIS is hosed.
520: * "host" is the (possibly fully-qualified) hostname and
521: * "shost" is the unqualified form of the hostname.
522: */
1.11 millert 523: nohostname = gethostname(thost, sizeof(thost));
524: if (nohostname)
525: user_host = user_shost = "localhost";
526: else {
1.1 millert 527: user_host = estrdup(thost);
1.23 millert 528: if (def_fqdn) {
1.11 millert 529: /* Defer call to set_fqdn() until log_error() is safe. */
530: user_shost = user_host;
1.1 millert 531: } else {
1.11 millert 532: if ((p = strchr(user_host, '.'))) {
533: *p = '\0';
534: user_shost = estrdup(user_host);
535: *p = '.';
536: } else {
537: user_shost = user_host;
538: }
1.1 millert 539: }
540: }
541:
542: if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO))) {
543: if (strncmp(p, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
544: p += sizeof(_PATH_DEV) - 1;
545: user_tty = estrdup(p);
546: } else
547: user_tty = "unknown";
548:
1.27 millert 549: for (ep = envp; *ep; ep++) {
550: switch (**ep) {
551: case 'P':
552: if (strncmp("PATH=", *ep, 5) == 0)
553: user_path = *ep + 5;
554: break;
555: case 'S':
556: if (strncmp("SHELL=", *ep, 6) == 0)
557: user_shell = *ep + 6;
558: else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
559: user_prompt = *ep + 12;
560: else if (strncmp("SUDO_USER=", *ep, 10) == 0)
561: prev_user = *ep + 10;
562: break;
563:
564: }
565: }
566:
1.1 millert 567: /*
568: * Get a local copy of the user's struct passwd with the shadow password
569: * if necessary. It is assumed that euid is 0 at this point so we
570: * can read the shadow passwd file if necessary.
571: */
572: if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
573: /* Need to make a fake struct passwd for logging to work. */
574: struct passwd pw;
575: char pw_name[MAX_UID_T_LEN + 1];
576:
577: pw.pw_uid = getuid();
1.17 millert 578: (void) snprintf(pw_name, sizeof(pw_name), "%lu",
579: (unsigned long) pw.pw_uid);
1.1 millert 580: pw.pw_name = pw_name;
581: sudo_user.pw = &pw;
582:
1.21 millert 583: /*
584: * If we are in -k/-K mode, just spew to stderr. It is not unusual for
585: * users to place "sudo -k" in a .logout file which can cause sudo to
586: * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
587: */
588: if (sudo_mode & (MODE_INVALIDATE|MODE_KILL))
589: errx(1, "uid %s does not exist in the passwd file!", pw_name);
590: log_error(0, "uid %s does not exist in the passwd file!", pw_name);
1.1 millert 591: }
1.15 millert 592: if (user_shell == NULL || *user_shell == '\0')
593: user_shell = sudo_user.pw->pw_shell;
1.1 millert 594:
595: /* It is now safe to use log_error() and set_perms() */
596:
1.27 millert 597: #ifdef HAVE_GETGROUPS
598: if ((user_ngroups = getgroups(0, NULL)) > 0) {
1.28 ! millert 599: user_groups = emalloc2(user_ngroups, MAX(sizeof(gid_t), sizeof(int)));
1.27 millert 600: if (getgroups(user_ngroups, user_groups) < 0)
601: log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
602: } else
603: user_ngroups = 0;
604: #endif
605:
1.23 millert 606: if (def_fqdn)
607: set_fqdn(); /* may call log_error() */
1.11 millert 608:
609: if (nohostname)
610: log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
611:
1.23 millert 612: set_runaspw(*user_runas); /* may call log_error() */
613: if (*user_runas[0] == '#' && runas_pw->pw_name && runas_pw->pw_name[0])
614: *user_runas = estrdup(runas_pw->pw_name);
615:
1.11 millert 616: /*
1.1 millert 617: * Get current working directory. Try as user, fall back to root.
618: */
1.17 millert 619: set_perms(PERM_USER);
1.1 millert 620: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.17 millert 621: set_perms(PERM_ROOT);
1.1 millert 622: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.19 millert 623: warnx("cannot get working directory");
1.17 millert 624: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 625: }
626: } else
1.17 millert 627: set_perms(PERM_ROOT);
1.1 millert 628:
629: /*
1.23 millert 630: * If we were given the '-e', '-i' or '-s' options we need to redo
1.1 millert 631: * NewArgv and NewArgc.
632: */
1.23 millert 633: if ((sudo_mode & (MODE_SHELL | MODE_EDIT))) {
1.1 millert 634: char **dst, **src = NewArgv;
635:
1.27 millert 636: /* Allocate an extra slot for execve() failure (ENOEXEC). */
637: NewArgv = (char **) emalloc2((++NewArgc + 2), sizeof(char *));
638: NewArgv++;
1.23 millert 639: if (ISSET(sudo_mode, MODE_EDIT))
640: NewArgv[0] = "sudoedit";
641: else if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
642: NewArgv[0] = runas_pw->pw_shell;
643: else if (user_shell && *user_shell)
1.1 millert 644: NewArgv[0] = user_shell;
1.23 millert 645: else
1.19 millert 646: errx(1, "unable to determine shell");
1.1 millert 647:
1.19 millert 648: /* copy the args from NewArgv */
1.1 millert 649: for (dst = NewArgv + 1; (*dst = *src) != NULL; ++src, ++dst)
1.27 millert 650: continue;
1.1 millert 651: }
652:
1.8 millert 653: /* Set login class if applicable. */
654: set_loginclass(sudo_user.pw);
655:
1.27 millert 656: /* Set project if applicable. */
657: set_project(runas_pw);
658:
1.1 millert 659: /* Resolve the path and return. */
1.23 millert 660: rval = FOUND;
661: user_stat = emalloc(sizeof(struct stat));
662: if (sudo_mode & (MODE_RUN | MODE_EDIT)) {
663: if (ISSET(sudo_mode, MODE_RUN)) {
664: /* XXX - default_runas may be modified during parsing of sudoers */
665: set_perms(PERM_RUNAS);
666: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
1.17 millert 667: set_perms(PERM_ROOT);
1.23 millert 668: if (rval != FOUND) {
669: /* Failed as root, try as invoking user. */
670: set_perms(PERM_USER);
671: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
672: set_perms(PERM_ROOT);
673: }
1.11 millert 674: }
675:
676: /* set user_args */
677: if (NewArgc > 1) {
678: char *to, **from;
1.17 millert 679: size_t size, n;
1.11 millert 680:
1.23 millert 681: /* If we didn't realloc NewArgv it is contiguous so just count. */
682: if (!(sudo_mode & (MODE_SHELL | MODE_EDIT))) {
1.11 millert 683: size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
684: strlen(NewArgv[NewArgc-1]) + 1;
685: } else {
686: for (size = 0, from = NewArgv + 1; *from; from++)
687: size += strlen(*from) + 1;
688: }
689:
1.23 millert 690: /* Alloc and build up user_args. */
1.17 millert 691: user_args = (char *) emalloc(size);
692: for (to = user_args, from = NewArgv + 1; *from; from++) {
693: n = strlcpy(to, *from, size - (to - user_args));
1.19 millert 694: if (n >= size - (to - user_args))
695: errx(1, "internal error, init_vars() overflow");
1.17 millert 696: to += n;
1.11 millert 697: *to++ = ' ';
698: }
699: *--to = '\0';
700: }
1.23 millert 701: }
702: if ((user_base = strrchr(user_cmnd, '/')) != NULL)
703: user_base++;
704: else
705: user_base = user_cmnd;
1.11 millert 706:
707: return(rval);
1.1 millert 708: }
709:
710: /*
711: * Command line argument parsing, can't use getopt(3).
712: */
713: static int
1.19 millert 714: parse_args(argc, argv)
715: int argc;
716: char **argv;
1.1 millert 717: {
1.17 millert 718: int rval = MODE_RUN; /* what mode is sudo to be run in? */
1.1 millert 719: int excl = 0; /* exclusive arg, no others allowed */
720:
1.19 millert 721: NewArgv = argv + 1;
722: NewArgc = argc - 1;
1.1 millert 723:
1.23 millert 724: /* First, check to see if we were invoked as "sudoedit". */
725: if (strcmp(getprogname(), "sudoedit") == 0) {
726: rval = MODE_EDIT;
727: excl = 'e';
728: } else
729: rval = MODE_RUN;
730:
1.27 millert 731: while (NewArgc > 0) {
732: if (NewArgv[0][0] == '-') {
733: if (NewArgv[0][1] != '\0' && NewArgv[0][2] != '\0')
734: warnx("please use single character options");
735:
736: switch (NewArgv[0][1]) {
737: case 'p':
738: /* Must have an associated prompt. */
739: if (NewArgv[1] == NULL)
740: usage(1);
1.1 millert 741:
1.27 millert 742: user_prompt = NewArgv[1];
1.1 millert 743:
1.27 millert 744: NewArgc--;
745: NewArgv++;
746: break;
747: case 'u':
748: /* Must have an associated runas user. */
749: if (NewArgv[1] == NULL)
750: usage(1);
1.1 millert 751:
1.27 millert 752: user_runas = &NewArgv[1];
1.1 millert 753:
1.27 millert 754: NewArgc--;
755: NewArgv++;
756: break;
1.8 millert 757: #ifdef HAVE_BSD_AUTH_H
1.27 millert 758: case 'a':
759: /* Must have an associated authentication style. */
760: if (NewArgv[1] == NULL)
761: usage(1);
1.8 millert 762:
1.27 millert 763: login_style = NewArgv[1];
1.8 millert 764:
1.27 millert 765: NewArgc--;
766: NewArgv++;
767: break;
1.8 millert 768: #endif
769: #ifdef HAVE_LOGIN_CAP_H
1.27 millert 770: case 'c':
771: /* Must have an associated login class. */
772: if (NewArgv[1] == NULL)
773: usage(1);
1.4 millert 774:
1.27 millert 775: login_class = NewArgv[1];
776: def_use_loginclass = TRUE;
1.4 millert 777:
1.27 millert 778: NewArgc--;
779: NewArgv++;
780: break;
1.4 millert 781: #endif
1.27 millert 782: case 'b':
783: SET(rval, MODE_BACKGROUND);
784: break;
785: case 'e':
786: rval = MODE_EDIT;
787: if (excl && excl != 'e')
788: usage_excl(1);
789: excl = 'e';
790: break;
791: case 'v':
792: rval = MODE_VALIDATE;
793: if (excl && excl != 'v')
794: usage_excl(1);
795: excl = 'v';
796: break;
797: case 'i':
798: SET(rval, (MODE_LOGIN_SHELL | MODE_SHELL));
799: def_env_reset = TRUE;
800: if (excl && excl != 'i')
801: usage_excl(1);
802: excl = 'i';
803: break;
804: case 'k':
805: rval = MODE_INVALIDATE;
806: if (excl && excl != 'k')
807: usage_excl(1);
808: excl = 'k';
809: break;
810: case 'K':
811: rval = MODE_KILL;
812: if (excl && excl != 'K')
813: usage_excl(1);
814: excl = 'K';
815: break;
816: case 'L':
817: rval = MODE_LISTDEFS;
818: if (excl && excl != 'L')
819: usage_excl(1);
820: excl = 'L';
821: break;
822: case 'l':
823: rval = MODE_LIST;
824: if (excl && excl != 'l')
825: usage_excl(1);
826: excl = 'l';
827: break;
828: case 'V':
829: rval = MODE_VERSION;
830: if (excl && excl != 'V')
831: usage_excl(1);
832: excl = 'V';
833: break;
834: case 'h':
835: rval = MODE_HELP;
836: if (excl && excl != 'h')
837: usage_excl(1);
838: excl = 'h';
839: break;
840: case 's':
841: SET(rval, MODE_SHELL);
842: if (excl && excl != 's')
843: usage_excl(1);
844: excl = 's';
845: break;
846: case 'H':
847: SET(rval, MODE_RESET_HOME);
848: break;
849: case 'P':
850: SET(rval, MODE_PRESERVE_GROUPS);
851: break;
852: case 'S':
853: SET(tgetpass_flags, TGP_STDIN);
854: break;
855: case 'E':
856: SET(rval, MODE_PRESERVE_ENV);
857: break;
858: case '-':
859: NewArgc--;
860: NewArgv++;
861: goto args_done;
862: case '\0':
863: warnx("'-' requires an argument");
864: usage(1);
865: default:
866: warnx("illegal option `%s'", NewArgv[0]);
867: usage(1);
868: }
869: } else if (NewArgv[0][0] != '/' && strchr(NewArgv[0], '=') != NULL) {
870: /* Could be an environment variable. */
871: struct list_member *ev;
872: ev = emalloc(sizeof(*ev));
873: ev->value = NewArgv[0];
874: ev->next = sudo_user.env_vars;
875: sudo_user.env_vars = ev;
876: } else {
877: /* Not an arg */
878: break;
1.1 millert 879: }
880: NewArgc--;
881: NewArgv++;
882: }
1.27 millert 883: args_done:
884:
885: if (ISSET(rval, MODE_EDIT) &&
886: (ISSET(rval, MODE_PRESERVE_ENV) || sudo_user.env_vars != NULL)) {
887: if (ISSET(rval, MODE_PRESERVE_ENV))
888: warnx("the `-E' option is not valid in edit mode");
889: if (sudo_user.env_vars != NULL)
890: warnx("you may not specify environment variables in edit mode");
891: usage(1);
892: }
1.1 millert 893:
1.24 millert 894: if (user_runas != NULL && !ISSET(rval, (MODE_EDIT|MODE_RUN))) {
895: if (excl != '\0')
896: warnx("the `-u' and '-%c' options may not be used together", excl);
897: usage(1);
898: }
1.23 millert 899: if ((NewArgc == 0 && (rval & MODE_EDIT)) ||
900: (NewArgc > 0 && !(rval & (MODE_RUN | MODE_EDIT))))
1.1 millert 901: usage(1);
1.27 millert 902: if (NewArgc == 0 && rval == MODE_RUN)
903: SET(rval, (MODE_IMPLIED_SHELL | MODE_SHELL));
1.1 millert 904:
905: return(rval);
906: }
907:
908: /*
909: * Sanity check sudoers mode/owner/type.
910: * Leaves a file pointer to the sudoers file open in ``fp''.
911: */
912: static void
913: check_sudoers()
914: {
915: struct stat statbuf;
916: int rootstat, i;
917:
918: /*
919: * Fix the mode and group on sudoers file from old default.
1.23 millert 920: * Only works if file system is readable/writable by root.
1.1 millert 921: */
1.17 millert 922: if ((rootstat = stat_sudoers(_PATH_SUDOERS, &statbuf)) == 0 &&
1.1 millert 923: SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
924: (statbuf.st_mode & 0007777) == 0400) {
925:
926: if (chmod(_PATH_SUDOERS, SUDOERS_MODE) == 0) {
1.19 millert 927: warnx("fixed mode on %s", _PATH_SUDOERS);
1.23 millert 928: SET(statbuf.st_mode, SUDOERS_MODE);
1.1 millert 929: if (statbuf.st_gid != SUDOERS_GID) {
930: if (!chown(_PATH_SUDOERS,(uid_t) -1,SUDOERS_GID)) {
1.19 millert 931: warnx("set group on %s", _PATH_SUDOERS);
1.1 millert 932: statbuf.st_gid = SUDOERS_GID;
1.19 millert 933: } else
934: warn("unable to set group on %s", _PATH_SUDOERS);
1.1 millert 935: }
1.19 millert 936: } else
937: warn("unable to fix mode on %s", _PATH_SUDOERS);
1.1 millert 938: }
939:
940: /*
941: * Sanity checks on sudoers file. Must be done as sudoers
942: * file owner. We already did a stat as root, so use that
943: * data if we can't stat as sudoers file owner.
944: */
1.17 millert 945: set_perms(PERM_SUDOERS);
1.1 millert 946:
1.17 millert 947: if (rootstat != 0 && stat_sudoers(_PATH_SUDOERS, &statbuf) != 0)
1.1 millert 948: log_error(USE_ERRNO, "can't stat %s", _PATH_SUDOERS);
949: else if (!S_ISREG(statbuf.st_mode))
950: log_error(0, "%s is not a regular file", _PATH_SUDOERS);
1.9 millert 951: else if (statbuf.st_size == 0)
952: log_error(0, "%s is zero length", _PATH_SUDOERS);
1.1 millert 953: else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
954: log_error(0, "%s is mode 0%o, should be 0%o", _PATH_SUDOERS,
1.27 millert 955: (unsigned int) (statbuf.st_mode & 07777),
956: (unsigned int) SUDOERS_MODE);
1.1 millert 957: else if (statbuf.st_uid != SUDOERS_UID)
1.17 millert 958: log_error(0, "%s is owned by uid %lu, should be %lu", _PATH_SUDOERS,
1.25 millert 959: (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1.1 millert 960: else if (statbuf.st_gid != SUDOERS_GID)
1.17 millert 961: log_error(0, "%s is owned by gid %lu, should be %lu", _PATH_SUDOERS,
1.25 millert 962: (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1.1 millert 963: else {
964: /* Solaris sometimes returns EAGAIN so try 10 times */
965: for (i = 0; i < 10 ; i++) {
966: errno = 0;
967: if ((sudoers_fp = fopen(_PATH_SUDOERS, "r")) == NULL ||
1.28 ! millert 968: fgetc(sudoers_fp) == EOF) {
! 969: if (sudoers_fp != NULL)
! 970: fclose(sudoers_fp);
1.1 millert 971: sudoers_fp = NULL;
972: if (errno != EAGAIN && errno != EWOULDBLOCK)
973: break;
974: } else
975: break;
976: sleep(1);
977: }
978: if (sudoers_fp == NULL)
979: log_error(USE_ERRNO, "can't open %s", _PATH_SUDOERS);
980: }
981:
1.17 millert 982: set_perms(PERM_ROOT); /* change back to root */
1.1 millert 983: }
984:
985: /*
986: * Close all open files (except std*) and turn off core dumps.
987: */
988: static void
989: initial_setup()
990: {
1.27 millert 991: int miss[3], devnull = -1;
1.22 millert 992: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1.1 millert 993: struct rlimit rl;
994:
995: /*
996: * Turn off core dumps.
997: */
1.4 millert 998: (void) getrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 999: memcpy(&rl, &corelimit, sizeof(struct rlimit));
1000: rl.rlim_cur = 0;
1.1 millert 1001: (void) setrlimit(RLIMIT_CORE, &rl);
1.20 millert 1002: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.1 millert 1003:
1.17 millert 1004: /*
1.27 millert 1005: * stdin, stdout and stderr must be open; set them to /dev/null
1006: * if they are closed and close all other fds.
1.17 millert 1007: */
1.27 millert 1008: miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1009: miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1010: miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1011: if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1012: if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
1013: if (miss[STDIN_FILENO])
1014: (void) dup2(devnull, STDIN_FILENO);
1015: if (miss[STDOUT_FILENO])
1016: (void) dup2(devnull, STDOUT_FILENO);
1017: if (miss[STDERR_FILENO])
1018: (void) dup2(devnull, STDERR_FILENO);
1019: }
1020: }
1021: closefrom(STDERR_FILENO + 1);
1.1 millert 1022: }
1023:
1.8 millert 1024: #ifdef HAVE_LOGIN_CAP_H
1025: static void
1.4 millert 1026: set_loginclass(pw)
1027: struct passwd *pw;
1028: {
1029: int errflags;
1030:
1031: /*
1032: * Don't make it a fatal error if the user didn't specify the login
1033: * class themselves. We do this because if login.conf gets
1034: * corrupted we want the admin to be able to use sudo to fix it.
1035: */
1036: if (login_class)
1037: errflags = NO_MAIL|MSG_ONLY;
1038: else
1039: errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1040:
1041: if (login_class && strcmp(login_class, "-") != 0) {
1.19 millert 1042: if (strcmp(*user_runas, "root") != 0 && user_uid != 0)
1043: errx(1, "only root can use -c %s", login_class);
1.4 millert 1044: } else {
1045: login_class = pw->pw_class;
1046: if (!login_class || !*login_class)
1047: login_class =
1048: (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1049: }
1050:
1051: lc = login_getclass(login_class);
1.10 millert 1052: if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1.4 millert 1053: log_error(errflags, "unknown login class: %s", login_class);
1.11 millert 1054: if (!lc)
1055: lc = login_getclass(NULL); /* needed for login_getstyle() later */
1.10 millert 1056: }
1.4 millert 1057: }
1058: #else
1.8 millert 1059: static void
1.4 millert 1060: set_loginclass(pw)
1061: struct passwd *pw;
1062: {
1063: }
1.8 millert 1064: #endif /* HAVE_LOGIN_CAP_H */
1.4 millert 1065:
1.27 millert 1066: #ifdef HAVE_PROJECT_H
1067: static void
1068: set_project(pw)
1069: struct passwd *pw;
1070: {
1071: int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1072: int errval;
1073: struct project proj;
1074: struct project *resultp = '\0';
1075: char buf[1024];
1076:
1077: /*
1078: * Collect the default project for the user and settaskid
1079: */
1080: setprojent();
1081: if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1082: errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1083: if (errval != 0) {
1084: switch(errval) {
1085: case SETPROJ_ERR_TASK:
1086: if (errno == EAGAIN)
1087: log_error(errflags, "resource control limit has been reached");
1088: else if (errno == ESRCH)
1089: log_error(errflags, "user \"%s\" is not a member of "
1090: "project \"%s\"", pw->pw_name, resultp->pj_name);
1091: else if (errno == EACCES)
1092: log_error(errflags, "the invoking task is final");
1093: else
1094: log_error(errflags, "could not join project \"%s\"",
1095: resultp->pj_name);
1096: break;
1097: case SETPROJ_ERR_POOL:
1098: if (errno == EACCES)
1099: log_error(errflags, "no resource pool accepting "
1100: "default bindings exists for project \"%s\"",
1101: resultp->pj_name);
1102: else if (errno == ESRCH)
1103: log_error(errflags, "specified resource pool does "
1104: "not exist for project \"%s\"", resultp->pj_name);
1105: else
1106: log_error(errflags, "could not bind to default "
1107: "resource pool for project \"%s\"", resultp->pj_name);
1108: break;
1109: default:
1110: if (errval <= 0) {
1111: log_error(errflags, "setproject failed for project \"%s\"",
1112: resultp->pj_name);
1113: } else {
1114: log_error(errflags, "warning, resource control assignment "
1115: "failed for project \"%s\"", resultp->pj_name);
1116: }
1117: }
1118: }
1119: } else {
1120: log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1121: }
1122: endprojent();
1123: }
1124: #else
1125: static void
1126: set_project(pw)
1127: struct passwd *pw;
1128: {
1129: }
1130: #endif /* HAVE_PROJECT_H */
1131:
1.1 millert 1132: /*
1.2 millert 1133: * Look up the fully qualified domain name and set user_host and user_shost.
1134: */
1135: void
1136: set_fqdn()
1137: {
1.28 ! millert 1138: #ifdef HAVE_GETADDRINFO
! 1139: struct addrinfo *res0, hint;
! 1140: #else
1.2 millert 1141: struct hostent *hp;
1.28 ! millert 1142: #endif
1.2 millert 1143: char *p;
1144:
1.28 ! millert 1145: #ifdef HAVE_GETADDRINFO
! 1146: memset(&hint, 0, sizeof(hint));
! 1147: hint.ai_family = PF_UNSPEC;
! 1148: hint.ai_flags = AI_CANONNAME;
! 1149: if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
! 1150: #else
1.14 millert 1151: if (!(hp = gethostbyname(user_host))) {
1.28 ! millert 1152: #endif
1.14 millert 1153: log_error(MSG_ONLY|NO_EXIT,
1.28 ! millert 1154: "unable to resolve host %s", user_host);
1.14 millert 1155: } else {
1156: if (user_shost != user_host)
1.27 millert 1157: efree(user_shost);
1158: efree(user_host);
1.28 ! millert 1159: #ifdef HAVE_GETADDRINFO
! 1160: user_host = estrdup(res0->ai_canonname);
! 1161: freeaddrinfo(res0);
! 1162: #else
1.14 millert 1163: user_host = estrdup(hp->h_name);
1.28 ! millert 1164: #endif
1.2 millert 1165: }
1166: if ((p = strchr(user_host, '.'))) {
1167: *p = '\0';
1168: user_shost = estrdup(user_host);
1169: *p = '.';
1170: } else {
1171: user_shost = user_host;
1172: }
1173: }
1174:
1175: /*
1.23 millert 1176: * Get passwd entry for the user we are going to run commands as.
1177: * By default, this is "root". Updates runas_pw as a side effect.
1178: */
1179: int
1180: set_runaspw(user)
1181: char *user;
1182: {
1183: if (runas_pw != NULL) {
1184: if (user_runas != &def_runas_default)
1185: return(TRUE); /* don't override -u option */
1.27 millert 1186: efree(runas_pw);
1.23 millert 1187: }
1188: if (*user == '#') {
1189: runas_pw = sudo_getpwuid(atoi(user + 1));
1190: if (runas_pw == NULL) {
1191: runas_pw = emalloc(sizeof(struct passwd));
1192: (void) memset((VOID *)runas_pw, 0, sizeof(struct passwd));
1193: runas_pw->pw_uid = atoi(user + 1);
1194: }
1195: } else {
1196: runas_pw = sudo_getpwnam(user);
1197: if (runas_pw == NULL)
1198: log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %s!", user);
1199: }
1200: return(TRUE);
1201: }
1202:
1203: /*
1.6 millert 1204: * Get passwd entry for the user we are going to authenticate as.
1.23 millert 1205: * By default, this is the user invoking sudo. In the most common
1206: * case, this matches sudo_user.pw or runas_pw.
1.4 millert 1207: */
1.6 millert 1208: static struct passwd *
1209: get_authpw()
1.4 millert 1210: {
1211: struct passwd *pw;
1212:
1.23 millert 1213: if (def_rootpw) {
1214: if (runas_pw->pw_uid == 0)
1215: pw = runas_pw;
1216: else if ((pw = sudo_getpwuid(0)) == NULL)
1.4 millert 1217: log_error(0, "uid 0 does not exist in the passwd file!");
1.23 millert 1218: } else if (def_runaspw) {
1219: if (strcmp(def_runas_default, *user_runas) == 0)
1220: pw = runas_pw;
1221: else if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
1.4 millert 1222: log_error(0, "user %s does not exist in the passwd file!",
1.23 millert 1223: def_runas_default);
1224: } else if (def_targetpw) {
1225: if (runas_pw->pw_name == NULL)
1226: log_error(NO_MAIL|MSG_ONLY, "no passwd entry for %lu!",
1.25 millert 1227: (unsigned long) runas_pw->pw_uid);
1.23 millert 1228: pw = runas_pw;
1.6 millert 1229: } else
1230: pw = sudo_user.pw;
1231:
1232: return(pw);
1.4 millert 1233: }
1234:
1235: /*
1.1 millert 1236: * Tell which options are mutually exclusive and exit.
1237: */
1238: static void
1239: usage_excl(exit_val)
1240: int exit_val;
1241: {
1.27 millert 1242: warnx("Only one of the -e, -h, i, -k, -K, -l, -s, -v or -V options may be used");
1.1 millert 1243: usage(exit_val);
1244: }
1245:
1246: /*
1247: * Give usage message and exit.
1248: */
1249: static void
1250: usage(exit_val)
1251: int exit_val;
1252: {
1.27 millert 1253: char **p, **uvec[4];
1254: int i, linelen, linemax, ulen;
1255: static char *uvec1[] = {
1256: " -h | -K | -k | -L | -l | -V | -v",
1257: NULL
1258: };
1259: static char *uvec2[] = {
1260: " [-bEHPS]",
1.23 millert 1261: #ifdef HAVE_BSD_AUTH_H
1262: " [-a auth_type]",
1263: #endif
1.8 millert 1264: #ifdef HAVE_LOGIN_CAP_H
1.23 millert 1265: " [-c class|-]",
1.8 millert 1266: #endif
1.23 millert 1267: " [-p prompt]",
1268: " [-u username|#uid]",
1.27 millert 1269: " [VAR=value]",
1270: " {-i | -s | <command>}",
1271: NULL
1272: };
1273: static char *uvec3[] = {
1274: " -e",
1275: " [-S]",
1276: #ifdef HAVE_BSD_AUTH_H
1277: " [-a auth_type]",
1278: #endif
1279: #ifdef HAVE_LOGIN_CAP_H
1280: " [-c class|-]",
1281: #endif
1282: " [-p prompt]",
1283: " [-u username|#uid]",
1284: " file ...",
1.23 millert 1285: NULL
1286: };
1287:
1288: /*
1.27 millert 1289: * Use usage vectors appropriate to the progname.
1.23 millert 1290: */
1291: if (strcmp(getprogname(), "sudoedit") == 0) {
1.27 millert 1292: uvec[0] = uvec3 + 1;
1293: uvec[1] = NULL;
1.23 millert 1294: } else {
1.27 millert 1295: uvec[0] = uvec1;
1296: uvec[1] = uvec2;
1297: uvec[2] = uvec3;
1298: uvec[3] = NULL;
1.23 millert 1299: }
1300:
1301: /*
1.27 millert 1302: * Print usage and wrap lines as needed.
1.23 millert 1303: * Assumes an 80-character wide terminal, which is kind of bogus...
1304: */
1305: ulen = (int)strlen(getprogname()) + 7;
1306: linemax = 80;
1.27 millert 1307: for (i = 0; uvec[i] != NULL; i++) {
1308: linelen = linemax - ulen;
1309: printf("usage: %s", getprogname());
1310: for (p = uvec[i]; *p != NULL; p++) {
1311: if (linelen == linemax || (linelen -= strlen(*p)) >= 0) {
1312: fputs(*p, stdout);
1313: } else {
1314: p--;
1315: linelen = linemax;
1316: printf("\n%*s", ulen, "");
1317: }
1.23 millert 1318: }
1.27 millert 1319: putchar('\n');
1.23 millert 1320: }
1.1 millert 1321: exit(exit_val);
1322: }
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