Annotation of src/usr.bin/sudo/sudo.c, Revision 1.34
1.1 millert 1: /*
1.34 ! millert 2: * Copyright (c) 1993-1996, 1998-2008 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:
98: #include "sudo.h"
1.34 ! millert 99: #include "sudo_usage.h"
! 100: #include "lbuf.h"
1.1 millert 101: #include "interfaces.h"
102: #include "version.h"
103:
104: #ifndef lint
1.34 ! millert 105: __unused static const char rcsid[] = "$Sudo: sudo.c,v 1.499 2008/11/11 18:28:08 millert Exp $";
1.1 millert 106: #endif /* lint */
107:
108: /*
109: * Prototypes
110: */
1.34 ! millert 111: static void init_vars __P((int, char **));
! 112: static int set_cmnd __P((int));
1.19 millert 113: static int parse_args __P((int, char **));
1.11 millert 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 *));
1.34 ! millert 117: static void set_runasgr __P((char *));
! 118: static void set_runaspw __P((char *));
! 119: static void show_version __P((void));
1.27 millert 120: static void usage __P((int))
121: __attribute__((__noreturn__));
122: static void usage_excl __P((int))
123: __attribute__((__noreturn__));
1.6 millert 124: static struct passwd *get_authpw __P((void));
1.27 millert 125: extern int sudo_edit __P((int, char **, char **));
1.34 ! millert 126: extern void rebuild_env __P((int, int));
! 127: void validate_env_vars __P((struct list_member *));
! 128: void insert_env_vars __P((struct list_member *));
1.1 millert 129:
130: /*
131: * Globals
132: */
1.19 millert 133: int Argc, NewArgc;
134: char **Argv, **NewArgv;
1.23 millert 135: char *prev_user;
1.34 ! millert 136: static int user_closefrom = -1;
1.1 millert 137: struct sudo_user sudo_user;
1.34 ! millert 138: struct passwd *auth_pw, *list_pw;
1.1 millert 139: struct interface *interfaces;
140: int num_interfaces;
1.4 millert 141: int tgetpass_flags;
1.34 ! millert 142: int long_list;
1.17 millert 143: uid_t timestamp_uid;
1.1 millert 144: extern int errorlineno;
1.34 ! millert 145: extern int parse_error;
! 146: extern char *errorfile;
1.4 millert 147: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
148: static struct rlimit corelimit;
1.20 millert 149: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.8 millert 150: #ifdef HAVE_LOGIN_CAP_H
151: login_cap_t *lc;
152: #endif /* HAVE_LOGIN_CAP_H */
153: #ifdef HAVE_BSD_AUTH_H
154: char *login_style;
155: #endif /* HAVE_BSD_AUTH_H */
1.33 millert 156: sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp;
1.34 ! millert 157: static char *runas_user;
! 158: static char *runas_group;
! 159: static struct sudo_nss_list *snl;
! 160:
! 161: /* For getopt(3) */
! 162: extern char *optarg;
! 163: extern int optind;
1.1 millert 164:
165: int
1.11 millert 166: main(argc, argv, envp)
1.1 millert 167: int argc;
168: char **argv;
1.11 millert 169: char **envp;
1.1 millert 170: {
1.34 ! millert 171: int sources = 0, validated;
! 172: int fd, cmnd_status, sudo_mode, pwflag, rc = 0;
1.23 millert 173: sigaction_t sa;
1.34 ! millert 174: #if defined(SUDO_DEVEL) && defined(__OpenBSD__)
! 175: extern char *malloc_options;
! 176: malloc_options = "AFGJPR";
! 177: #endif
! 178: struct sudo_nss *nss;
1.1 millert 179:
1.27 millert 180: #ifdef HAVE_SETLOCALE
181: setlocale(LC_ALL, "");
182: #endif
183:
1.19 millert 184: Argv = argv;
1.23 millert 185: if ((Argc = argc) < 1)
186: usage(1);
1.19 millert 187:
1.1 millert 188: /* Must be done as the first thing... */
189: #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS)
1.19 millert 190: (void) set_auth_parameters(Argc, Argv);
1.1 millert 191: # ifdef HAVE_INITPRIVS
192: initprivs();
193: # endif
194: #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */
195:
1.19 millert 196: if (geteuid() != 0)
1.34 ! millert 197: errorx(1, "must be setuid root");
1.1 millert 198:
199: /*
1.17 millert 200: * Signal setup:
201: * Ignore keyboard-generated signals so the user cannot interrupt
202: * us at some point and avoid the logging.
203: * Install handler to wait for children when they exit.
1.1 millert 204: */
1.34 ! millert 205: zero_bytes(&sa, sizeof(sa));
1.11 millert 206: sigemptyset(&sa.sa_mask);
207: sa.sa_flags = SA_RESTART;
208: sa.sa_handler = SIG_IGN;
1.17 millert 209: (void) sigaction(SIGINT, &sa, &saved_sa_int);
210: (void) sigaction(SIGQUIT, &sa, &saved_sa_quit);
211: (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp);
1.1 millert 212:
213: /*
1.34 ! millert 214: * Turn off core dumps and make sure fds 0-2 are open.
1.1 millert 215: */
216: initial_setup();
1.34 ! millert 217: sudo_setpwent();
! 218: sudo_setgrent();
1.1 millert 219:
220: /* Parse our arguments. */
1.19 millert 221: sudo_mode = parse_args(Argc, Argv);
1.1 millert 222:
223: /* Setup defaults data structures. */
224: init_defaults();
225:
1.11 millert 226: /* Load the list of local ip addresses and netmasks. */
227: load_interfaces();
228:
229: pwflag = 0;
1.23 millert 230: if (ISSET(sudo_mode, MODE_SHELL))
1.1 millert 231: user_cmnd = "shell";
1.23 millert 232: else if (ISSET(sudo_mode, MODE_EDIT))
233: user_cmnd = "sudoedit";
1.1 millert 234: else
235: switch (sudo_mode) {
236: case MODE_VERSION:
1.34 ! millert 237: show_version();
1.1 millert 238: break;
239: case MODE_HELP:
240: usage(0);
241: break;
242: case MODE_VALIDATE:
243: user_cmnd = "validate";
1.23 millert 244: pwflag = I_VERIFYPW;
1.1 millert 245: break;
246: case MODE_KILL:
247: case MODE_INVALIDATE:
248: user_cmnd = "kill";
1.11 millert 249: pwflag = -1;
1.1 millert 250: break;
251: case MODE_LISTDEFS:
252: list_options();
253: exit(0);
254: break;
255: case MODE_LIST:
256: user_cmnd = "list";
1.23 millert 257: pwflag = I_LISTPW;
1.34 ! millert 258: break;
! 259: case MODE_CHECK:
! 260: pwflag = I_LISTPW;
1.1 millert 261: break;
262: }
263:
264: /* Must have a command to run... */
265: if (user_cmnd == NULL && NewArgc == 0)
266: usage(1);
267:
1.34 ! millert 268: init_vars(sudo_mode, envp); /* XXX - move this later? */
! 269:
! 270: /* Parse nsswitch.conf for sudoers order. */
! 271: snl = sudo_read_nss();
! 272:
! 273: /* Open and parse sudoers, set global defaults */
! 274: tq_foreach_fwd(snl, nss) {
! 275: if (nss->open(nss) == 0 && nss->parse(nss) == 0) {
! 276: sources++;
! 277: nss->setdefs(nss);
! 278: }
! 279: }
! 280: if (sources == 0)
! 281: log_error(0, "no valid sudoers sources found, quitting");
! 282:
! 283: /* XXX - collect post-sudoers parse settings into a function */
! 284:
! 285: /*
! 286: * Set runas passwd/group entries based on command line or sudoers.
! 287: * Note that if runas_group was specified without runas_user we
! 288: * defer setting runas_pw so the match routines know to ignore it.
! 289: */
! 290: if (runas_group != NULL) {
! 291: set_runasgr(runas_group);
! 292: if (runas_user != NULL)
! 293: set_runaspw(runas_user);
! 294: } else
! 295: set_runaspw(runas_user ? runas_user : def_runas_default);
! 296:
! 297: if (!update_defaults(SETDEF_RUNAS))
! 298: log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
! 299:
! 300: /* Set login class if applicable. */
! 301: set_loginclass(sudo_user.pw);
1.1 millert 302:
1.34 ! millert 303: /* Update initial shell now that runas is set. */
! 304: if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
! 305: NewArgv[0] = runas_pw->pw_shell;
! 306:
! 307: /* This goes after sudoers is parsed since it may have timestamp options. */
! 308: if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) {
! 309: remove_timestamp((sudo_mode == MODE_KILL));
! 310: cleanup(0);
! 311: exit(0);
! 312: }
! 313:
! 314: /* Is root even allowed to run sudo? */
! 315: if (user_uid == 0 && !def_root_sudo) {
! 316: (void) fprintf(stderr,
! 317: "Sorry, %s has been configured to not allow root to run it.\n",
! 318: getprogname());
! 319: exit(1);
! 320: }
1.23 millert 321:
1.34 ! millert 322: /* Check for -C overriding def_closefrom. */
! 323: if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
! 324: if (!def_closefrom_override)
! 325: errorx(1, "you are not permitted to use the -C option");
! 326: else
! 327: def_closefrom = user_closefrom;
1.23 millert 328: }
1.33 millert 329:
1.34 ! millert 330: cmnd_status = set_cmnd(sudo_mode);
! 331:
! 332: #ifdef HAVE_SETLOCALE
! 333: if (!setlocale(LC_ALL, def_sudoers_locale)) {
! 334: warningx("unable to set locale to \"%s\", using \"C\"",
! 335: def_sudoers_locale);
! 336: setlocale(LC_ALL, "C");
! 337: }
1.23 millert 338: #endif
1.34 ! millert 339:
! 340: validated = FLAG_NO_USER | FLAG_NO_HOST;
! 341: tq_foreach_fwd(snl, nss) {
! 342: validated = nss->lookup(nss, validated, pwflag);
! 343:
! 344: /* Handle [NOTFOUND=return] */
! 345: if (!ISSET(validated, VALIDATE_OK) && nss->ret_notfound)
! 346: break;
! 347: }
1.26 millert 348: if (safe_cmnd == NULL)
1.27 millert 349: safe_cmnd = estrdup(user_cmnd);
1.1 millert 350:
1.34 ! millert 351: #ifdef HAVE_SETLOCALE
! 352: setlocale(LC_ALL, "");
! 353: #endif
! 354:
! 355: /* If only a group was specified, set runas_pw based on invoking user. */
! 356: if (runas_pw == NULL)
! 357: set_runaspw(user_name);
! 358:
1.11 millert 359: /*
1.17 millert 360: * Look up the timestamp dir owner if one is specified.
361: */
1.23 millert 362: if (def_timestampowner) {
1.17 millert 363: struct passwd *pw;
364:
1.23 millert 365: if (*def_timestampowner == '#')
1.34 ! millert 366: pw = sudo_getpwuid(atoi(def_timestampowner + 1));
1.17 millert 367: else
1.34 ! millert 368: pw = sudo_getpwnam(def_timestampowner);
1.17 millert 369: if (!pw)
370: log_error(0, "timestamp owner (%s): No such user",
1.23 millert 371: def_timestampowner);
1.17 millert 372: timestamp_uid = pw->pw_uid;
373: }
374:
1.11 millert 375: /* If given the -P option, set the "preserve_groups" flag. */
1.23 millert 376: if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS))
377: def_preserve_groups = TRUE;
1.11 millert 378:
1.3 millert 379: /* If no command line args and "set_home" is not set, error out. */
1.23 millert 380: if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs)
1.3 millert 381: usage(1);
382:
1.1 millert 383: /* Bail if a tty is required and we don't have one. */
1.23 millert 384: if (def_requiretty) {
1.1 millert 385: if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1)
386: log_error(NO_MAIL, "sorry, you must have a tty to run sudo");
387: else
388: (void) close(fd);
389: }
390:
1.34 ! millert 391: /* Use askpass value from sudoers unless user specified their own. */
! 392: if (def_askpass && !user_askpass)
! 393: user_askpass = def_askpass;
! 394:
! 395: /* User may have overridden environment resetting via the -E flag. */
! 396: if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv)
1.27 millert 397: def_env_reset = FALSE;
398:
399: /* Build a new environment that avoids any nasty bits. */
1.34 ! millert 400: rebuild_env(sudo_mode, def_noexec);
1.27 millert 401:
1.6 millert 402: /* Fill in passwd struct based on user we are authenticating as. */
403: auth_pw = get_authpw();
1.4 millert 404:
1.23 millert 405: /* Require a password if sudoers says so. */
1.34 ! millert 406: if (def_authenticate)
! 407: check_user(validated, !ISSET(sudo_mode, MODE_NONINTERACTIVE));
1.23 millert 408:
409: /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */
1.34 ! millert 410: /* XXX - causes confusion when root is not listed in sudoers */
! 411: if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) {
! 412: if (user_uid == 0 && strcmp(prev_user, "root") != 0) {
1.23 millert 413: struct passwd *pw;
414:
1.34 ! millert 415: if ((pw = sudo_getpwnam(prev_user)) != NULL)
1.23 millert 416: sudo_user.pw = pw;
1.34 ! millert 417: }
1.23 millert 418: }
1.1 millert 419:
1.23 millert 420: if (ISSET(validated, VALIDATE_OK)) {
1.1 millert 421: /* Finally tell the user if the command did not exist. */
1.34 ! millert 422: if (cmnd_status == NOT_FOUND_DOT)
! 423: errorx(1, "ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd);
! 424: else if (cmnd_status == NOT_FOUND)
! 425: errorx(1, "%s: command not found", user_cmnd);
1.1 millert 426:
1.27 millert 427: /* If user specified env vars make sure sudoers allows it. */
1.34 ! millert 428: if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) {
1.27 millert 429: if (ISSET(sudo_mode, MODE_PRESERVE_ENV))
430: log_error(NO_MAIL,
431: "sorry, you are not allowed to preserve the environment");
432: else
433: validate_env_vars(sudo_user.env_vars);
434: }
435:
1.34 ! millert 436: log_allowed(validated);
! 437: if (sudo_mode == MODE_CHECK)
! 438: rc = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw);
! 439: else if (sudo_mode == MODE_LIST)
! 440: display_privs(snl, list_pw ? list_pw : sudo_user.pw);
! 441:
! 442: /* Cleanup sudoers sources */
! 443: tq_foreach_fwd(snl, nss)
! 444: nss->close(nss);
! 445:
! 446: /* Deferred exit due to sudo_ldap_close() */
! 447: if (sudo_mode == MODE_VALIDATE || sudo_mode == MODE_CHECK ||
! 448: sudo_mode == MODE_LIST)
! 449: exit(rc);
! 450:
! 451: /*
! 452: * Override user's umask if configured to do so.
! 453: * If user's umask is more restrictive, OR in those bits too.
! 454: */
! 455: if (def_umask != 0777) {
! 456: mode_t mask = umask(def_umask);
! 457: mask |= def_umask;
! 458: if (mask != def_umask)
! 459: umask(mask);
1.1 millert 460: }
461:
1.4 millert 462: /* Restore coredumpsize resource limit. */
463: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
464: (void) setrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 465: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.4 millert 466:
1.23 millert 467: /* Become specified user or root if executing a command. */
468: if (ISSET(sudo_mode, MODE_RUN))
469: set_perms(PERM_FULL_RUNAS);
1.16 millert 470:
1.23 millert 471: if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) {
472: char *p;
473:
474: /* Convert /bin/sh -> -sh so shell knows it is a login shell */
475: if ((p = strrchr(NewArgv[0], '/')) == NULL)
476: p = NewArgv[0];
477: *p = '-';
478: NewArgv[0] = p;
479:
480: /* Change to target user's homedir. */
481: if (chdir(runas_pw->pw_dir) == -1)
1.34 ! millert 482: warning("unable to change directory to %s", runas_pw->pw_dir);
! 483:
! 484: #if defined(__linux__) || defined(_AIX)
! 485: /* Insert system-wide environment variables. */
! 486: read_env_file(_PATH_ENVIRONMENT, TRUE);
! 487: #endif
1.23 millert 488: }
489:
490: if (ISSET(sudo_mode, MODE_EDIT))
1.27 millert 491: exit(sudo_edit(NewArgc, NewArgv, envp));
492:
1.34 ! millert 493: /* Insert system-wide environment variables. */
! 494: if (def_env_file)
! 495: read_env_file(def_env_file, FALSE);
! 496:
1.27 millert 497: /* Insert user-specified environment variables. */
1.34 ! millert 498: insert_env_vars(sudo_user.env_vars);
1.23 millert 499:
1.17 millert 500: /* Restore signal handlers before we exec. */
501: (void) sigaction(SIGINT, &saved_sa_int, NULL);
502: (void) sigaction(SIGQUIT, &saved_sa_quit, NULL);
503: (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL);
504:
1.34 ! millert 505: /* Close the password and group files and free up memory. */
! 506: sudo_endpwent();
! 507: sudo_endgrent();
! 508:
! 509: closefrom(def_closefrom + 1);
! 510:
1.1 millert 511: #ifndef PROFILING
1.23 millert 512: if (ISSET(sudo_mode, MODE_BACKGROUND) && fork() > 0)
1.1 millert 513: exit(0);
1.33 millert 514: else {
515: #ifdef HAVE_SELINUX
516: if (is_selinux_enabled() > 0 && user_role != NULL)
1.34 ! millert 517: selinux_exec(user_role, user_type, NewArgv,
1.33 millert 518: ISSET(sudo_mode, MODE_LOGIN_SHELL));
519: #endif
1.34 ! millert 520: execv(safe_cmnd, NewArgv);
1.33 millert 521: }
1.1 millert 522: #else
523: exit(0);
524: #endif /* PROFILING */
525: /*
1.34 ! millert 526: * If we got here then execve() failed...
1.1 millert 527: */
1.27 millert 528: if (errno == ENOEXEC) {
529: NewArgv--; /* at least one extra slot... */
530: NewArgv[0] = "sh";
531: NewArgv[1] = safe_cmnd;
1.34 ! millert 532: execv(_PATH_BSHELL, NewArgv);
! 533: } warning("unable to execute %s", safe_cmnd);
1.11 millert 534: exit(127);
1.34 ! millert 535: } else if (ISSET(validated, FLAG_NO_USER | FLAG_NO_HOST)) {
! 536: log_denial(validated, 1);
1.1 millert 537: exit(1);
1.34 ! millert 538: } else {
1.23 millert 539: if (def_path_info) {
1.1 millert 540: /*
541: * We'd like to not leak path info at all here, but that can
542: * *really* confuse the users. To really close the leak we'd
543: * have to say "not allowed to run foo" even when the problem
544: * is just "no foo in path" since the user can trivially set
545: * their path to just contain a single dir.
546: */
1.34 ! millert 547: log_denial(validated,
1.1 millert 548: !(cmnd_status == NOT_FOUND_DOT || cmnd_status == NOT_FOUND));
549: if (cmnd_status == NOT_FOUND)
1.34 ! millert 550: warningx("%s: command not found", user_cmnd);
1.1 millert 551: else if (cmnd_status == NOT_FOUND_DOT)
1.34 ! millert 552: 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 553: } else {
554: /* Just tell the user they are not allowed to run foo. */
1.34 ! millert 555: log_denial(validated, 1);
1.1 millert 556: }
557: exit(1);
558: }
559: exit(0); /* not reached */
560: }
561:
562: /*
563: * Initialize timezone, set umask, fill in ``sudo_user'' struct and
564: * load the ``interfaces'' array.
565: */
1.34 ! millert 566: static void
1.27 millert 567: init_vars(sudo_mode, envp)
1.1 millert 568: int sudo_mode;
1.27 millert 569: char **envp;
1.1 millert 570: {
1.34 ! millert 571: char *p, **ep, thost[MAXHOSTNAMELEN + 1];
! 572: int nohostname;
1.1 millert 573:
574: /* Sanity check command from user. */
1.23 millert 575: if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX)
1.34 ! millert 576: errorx(1, "%s: File name too long", NewArgv[0]);
1.1 millert 577:
578: #ifdef HAVE_TZSET
579: (void) tzset(); /* set the timezone if applicable */
580: #endif /* HAVE_TZSET */
581:
582: /* Default value for cmnd and cwd, overridden later. */
583: if (user_cmnd == NULL)
584: user_cmnd = NewArgv[0];
1.17 millert 585: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 586:
587: /*
588: * We avoid gethostbyname() if possible since we don't want
589: * sudo to block if DNS or NIS is hosed.
590: * "host" is the (possibly fully-qualified) hostname and
591: * "shost" is the unqualified form of the hostname.
592: */
1.11 millert 593: nohostname = gethostname(thost, sizeof(thost));
594: if (nohostname)
595: user_host = user_shost = "localhost";
596: else {
1.34 ! millert 597: thost[sizeof(thost) - 1] = '\0';
1.1 millert 598: user_host = estrdup(thost);
1.23 millert 599: if (def_fqdn) {
1.11 millert 600: /* Defer call to set_fqdn() until log_error() is safe. */
601: user_shost = user_host;
1.1 millert 602: } else {
1.11 millert 603: if ((p = strchr(user_host, '.'))) {
604: *p = '\0';
605: user_shost = estrdup(user_host);
606: *p = '.';
607: } else {
608: user_shost = user_host;
609: }
1.1 millert 610: }
611: }
612:
613: if ((p = ttyname(STDIN_FILENO)) || (p = ttyname(STDOUT_FILENO))) {
1.30 millert 614: user_tty = user_ttypath = estrdup(p);
615: if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
616: user_tty += sizeof(_PATH_DEV) - 1;
1.1 millert 617: } else
618: user_tty = "unknown";
619:
1.27 millert 620: for (ep = envp; *ep; ep++) {
1.34 ! millert 621: /* XXX - don't fill in if empty string */
1.27 millert 622: switch (**ep) {
1.34 ! millert 623: case 'D':
! 624: if (strncmp("DISPLAY=", *ep, 8) == 0)
! 625: user_display = *ep + 8;
! 626: break;
! 627: case 'K':
! 628: if (strncmp("KRB5CCNAME=", *ep, 11) == 0)
! 629: user_ccname = *ep + 11;
! 630: break;
1.27 millert 631: case 'P':
632: if (strncmp("PATH=", *ep, 5) == 0)
633: user_path = *ep + 5;
634: break;
635: case 'S':
636: if (strncmp("SHELL=", *ep, 6) == 0)
637: user_shell = *ep + 6;
638: else if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0)
639: user_prompt = *ep + 12;
640: else if (strncmp("SUDO_USER=", *ep, 10) == 0)
641: prev_user = *ep + 10;
1.34 ! millert 642: else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0)
! 643: user_askpass = *ep + 13;
1.27 millert 644: break;
645: }
646: }
647:
1.1 millert 648: /*
649: * Get a local copy of the user's struct passwd with the shadow password
650: * if necessary. It is assumed that euid is 0 at this point so we
651: * can read the shadow passwd file if necessary.
652: */
653: if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL) {
654: /* Need to make a fake struct passwd for logging to work. */
655: struct passwd pw;
656: char pw_name[MAX_UID_T_LEN + 1];
657:
658: pw.pw_uid = getuid();
1.17 millert 659: (void) snprintf(pw_name, sizeof(pw_name), "%lu",
660: (unsigned long) pw.pw_uid);
1.1 millert 661: pw.pw_name = pw_name;
662: sudo_user.pw = &pw;
663:
1.21 millert 664: /*
665: * If we are in -k/-K mode, just spew to stderr. It is not unusual for
666: * users to place "sudo -k" in a .logout file which can cause sudo to
667: * be run during reboot after the YP/NIS/NIS+/LDAP/etc daemon has died.
668: */
669: if (sudo_mode & (MODE_INVALIDATE|MODE_KILL))
1.34 ! millert 670: errorx(1, "unknown uid: %s", pw_name);
! 671: log_error(0, "unknown uid: %s", pw_name);
1.1 millert 672: }
1.15 millert 673: if (user_shell == NULL || *user_shell == '\0')
1.34 ! millert 674: user_shell = estrdup(sudo_user.pw->pw_shell);
1.1 millert 675:
676: /* It is now safe to use log_error() and set_perms() */
677:
1.27 millert 678: #ifdef HAVE_GETGROUPS
679: if ((user_ngroups = getgroups(0, NULL)) > 0) {
1.31 millert 680: user_groups = emalloc2(user_ngroups, sizeof(GETGROUPS_T));
1.27 millert 681: if (getgroups(user_ngroups, user_groups) < 0)
682: log_error(USE_ERRNO|MSG_ONLY, "can't get group vector");
683: } else
684: user_ngroups = 0;
685: #endif
686:
1.23 millert 687: if (def_fqdn)
688: set_fqdn(); /* may call log_error() */
1.11 millert 689:
690: if (nohostname)
691: log_error(USE_ERRNO|MSG_ONLY, "can't get hostname");
692:
693: /*
1.1 millert 694: * Get current working directory. Try as user, fall back to root.
695: */
1.17 millert 696: set_perms(PERM_USER);
1.1 millert 697: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.17 millert 698: set_perms(PERM_ROOT);
1.1 millert 699: if (!getcwd(user_cwd, sizeof(user_cwd))) {
1.34 ! millert 700: warningx("cannot get working directory");
1.17 millert 701: (void) strlcpy(user_cwd, "unknown", sizeof(user_cwd));
1.1 millert 702: }
703: } else
1.17 millert 704: set_perms(PERM_ROOT);
1.1 millert 705:
706: /*
1.23 millert 707: * If we were given the '-e', '-i' or '-s' options we need to redo
1.1 millert 708: * NewArgv and NewArgc.
709: */
1.34 ! millert 710: if (ISSET(sudo_mode, MODE_EDIT)) {
! 711: NewArgv--;
! 712: NewArgc++;
! 713: NewArgv[0] = "sudoedit";
! 714: } else if (ISSET(sudo_mode, MODE_SHELL)) {
! 715: char **av;
1.1 millert 716:
1.27 millert 717: /* Allocate an extra slot for execve() failure (ENOEXEC). */
1.34 ! millert 718: av = (char **) emalloc2(5, sizeof(char *));
! 719: av++;
1.1 millert 720:
1.34 ! millert 721: av[0] = user_shell; /* may be updated later */
! 722: if (NewArgc > 0) {
! 723: size_t size;
! 724: char *cmnd, *src, *dst, *end;
! 725: size = (size_t) (NewArgv[NewArgc - 1] - NewArgv[0]) +
! 726: strlen(NewArgv[NewArgc - 1]) + 1;
! 727: cmnd = emalloc(size);
! 728: src = NewArgv[0];
! 729: dst = cmnd;
! 730: for (end = src + size - 1; src < end; src++, dst++)
! 731: *dst = *src == 0 ? ' ' : *src;
! 732: *dst = '\0';
! 733: av[1] = "-c";
! 734: av[2] = cmnd;
! 735: NewArgc = 2;
! 736: }
! 737: av[++NewArgc] = NULL;
! 738: NewArgv = av;
1.1 millert 739: }
1.34 ! millert 740: }
1.1 millert 741:
1.34 ! millert 742: /*
! 743: * Fill in user_cmnd, user_args, user_base and user_stat variables
! 744: * and apply any command-specific defaults entries.
! 745: */
! 746: static int
! 747: set_cmnd(sudo_mode)
! 748: int sudo_mode;
! 749: {
! 750: int rval;
1.8 millert 751:
1.27 millert 752: /* Set project if applicable. */
753: set_project(runas_pw);
754:
1.1 millert 755: /* Resolve the path and return. */
1.23 millert 756: rval = FOUND;
757: user_stat = emalloc(sizeof(struct stat));
1.34 ! millert 758: if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) {
! 759: if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) {
1.23 millert 760: set_perms(PERM_RUNAS);
761: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
1.17 millert 762: set_perms(PERM_ROOT);
1.23 millert 763: if (rval != FOUND) {
764: /* Failed as root, try as invoking user. */
765: set_perms(PERM_USER);
766: rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path);
767: set_perms(PERM_ROOT);
768: }
1.11 millert 769: }
770:
771: /* set user_args */
772: if (NewArgc > 1) {
773: char *to, **from;
1.17 millert 774: size_t size, n;
1.11 millert 775:
1.23 millert 776: /* If we didn't realloc NewArgv it is contiguous so just count. */
1.34 ! millert 777: if (!ISSET(sudo_mode, MODE_SHELL)) {
1.11 millert 778: size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
779: strlen(NewArgv[NewArgc-1]) + 1;
780: } else {
781: for (size = 0, from = NewArgv + 1; *from; from++)
782: size += strlen(*from) + 1;
783: }
784:
1.23 millert 785: /* Alloc and build up user_args. */
1.17 millert 786: user_args = (char *) emalloc(size);
787: for (to = user_args, from = NewArgv + 1; *from; from++) {
788: n = strlcpy(to, *from, size - (to - user_args));
1.19 millert 789: if (n >= size - (to - user_args))
1.34 ! millert 790: errorx(1, "internal error, init_vars() overflow");
1.17 millert 791: to += n;
1.11 millert 792: *to++ = ' ';
793: }
794: *--to = '\0';
795: }
1.23 millert 796: }
797: if ((user_base = strrchr(user_cmnd, '/')) != NULL)
798: user_base++;
799: else
800: user_base = user_cmnd;
1.11 millert 801:
1.34 ! millert 802: if (!update_defaults(SETDEF_CMND))
! 803: log_error(NO_STDERR|NO_EXIT, "problem with defaults entries");
! 804:
1.11 millert 805: return(rval);
1.1 millert 806: }
807:
808: /*
1.34 ! millert 809: * Command line argument parsing.
! 810: * Sets NewArgc and NewArgv which corresponds to the argc/argv we'll use
! 811: * for the command to be run (if we are running one).
1.1 millert 812: */
813: static int
1.19 millert 814: parse_args(argc, argv)
815: int argc;
816: char **argv;
1.1 millert 817: {
1.34 ! millert 818: int mode = 0; /* what mode is sudo to be run in? */
! 819: int flags = 0; /* mode flags */
! 820: int ch;
1.1 millert 821:
1.23 millert 822: /* First, check to see if we were invoked as "sudoedit". */
1.34 ! millert 823: if (strcmp(getprogname(), "sudoedit") == 0)
! 824: mode = MODE_EDIT;
1.23 millert 825:
1.34 ! millert 826: /* Returns true if the last option string was "--" */
! 827: #define got_end_of_args (optind > 1 && argv[optind - 1][0] == '-' && \
! 828: argv[optind - 1][1] == '-' && argv[optind - 1][2] == '\0')
! 829:
! 830: /* Returns true if next option is an environment variable */
! 831: #define is_envar (optind < argc && argv[optind][0] != '/' && \
! 832: strchr(argv[optind], '=') != NULL)
1.27 millert 833:
1.34 ! millert 834: for (;;) {
! 835: /*
! 836: * We disable arg permutation for GNU getopt().
! 837: * Some trickiness is required to allow environment variables
! 838: * to be interspersed with command line options.
! 839: */
! 840: if ((ch = getopt(argc, argv, "+Aa:bC:c:Eeg:HhiKkLlnPp:r:Sst:U:u:Vv")) != -1) {
! 841: switch (ch) {
! 842: case 'A':
! 843: SET(tgetpass_flags, TGP_ASKPASS);
1.27 millert 844: break;
1.8 millert 845: #ifdef HAVE_BSD_AUTH_H
1.27 millert 846: case 'a':
1.34 ! millert 847: login_style = optarg;
! 848: break;
! 849: #endif
! 850: case 'b':
! 851: SET(flags, MODE_BACKGROUND);
! 852: break;
! 853: case 'C':
! 854: if ((user_closefrom = atoi(optarg)) < 3) {
! 855: warningx("the argument to -C must be at least 3");
1.27 millert 856: usage(1);
1.34 ! millert 857: }
1.27 millert 858: break;
1.8 millert 859: #ifdef HAVE_LOGIN_CAP_H
1.27 millert 860: case 'c':
1.34 ! millert 861: login_class = optarg;
1.27 millert 862: def_use_loginclass = TRUE;
863: break;
1.4 millert 864: #endif
1.34 ! millert 865: case 'E':
! 866: SET(flags, MODE_PRESERVE_ENV);
1.27 millert 867: break;
868: case 'e':
1.34 ! millert 869: if (mode && mode != MODE_EDIT)
1.27 millert 870: usage_excl(1);
1.34 ! millert 871: mode = MODE_EDIT;
! 872: break;
! 873: case 'g':
! 874: runas_group = optarg;
! 875: break;
! 876: case 'H':
! 877: SET(flags, MODE_RESET_HOME);
1.27 millert 878: break;
1.34 ! millert 879: case 'h':
! 880: if (mode && mode != MODE_HELP)
1.27 millert 881: usage_excl(1);
1.34 ! millert 882: mode = MODE_HELP;
1.27 millert 883: break;
884: case 'i':
1.34 ! millert 885: SET(flags, MODE_LOGIN_SHELL);
1.27 millert 886: def_env_reset = TRUE;
887: break;
888: case 'k':
1.34 ! millert 889: if (mode && mode != MODE_INVALIDATE)
1.27 millert 890: usage_excl(1);
1.34 ! millert 891: mode = MODE_INVALIDATE;
1.27 millert 892: break;
893: case 'K':
1.34 ! millert 894: if (mode && mode != MODE_KILL)
1.27 millert 895: usage_excl(1);
1.34 ! millert 896: mode = MODE_KILL;
1.27 millert 897: break;
898: case 'L':
1.34 ! millert 899: if (mode && mode != MODE_LISTDEFS)
1.27 millert 900: usage_excl(1);
1.34 ! millert 901: mode = MODE_LISTDEFS;
1.27 millert 902: break;
903: case 'l':
1.34 ! millert 904: if (mode) {
! 905: if (mode == MODE_LIST)
! 906: long_list = 1;
! 907: else
! 908: usage_excl(1);
! 909: }
! 910: mode = MODE_LIST;
1.27 millert 911: break;
1.34 ! millert 912: case 'n':
! 913: SET(flags, MODE_NONINTERACTIVE);
1.27 millert 914: break;
1.34 ! millert 915: case 'P':
! 916: SET(flags, MODE_PRESERVE_GROUPS);
1.27 millert 917: break;
1.34 ! millert 918: case 'p':
! 919: user_prompt = optarg;
! 920: def_passprompt_override = TRUE;
1.27 millert 921: break;
1.34 ! millert 922: #ifdef HAVE_SELINUX
! 923: case 'r':
! 924: user_role = optarg;
1.27 millert 925: break;
1.34 ! millert 926: case 't':
! 927: user_type = optarg;
1.27 millert 928: break;
1.34 ! millert 929: #endif
1.27 millert 930: case 'S':
931: SET(tgetpass_flags, TGP_STDIN);
932: break;
1.34 ! millert 933: case 's':
! 934: SET(flags, MODE_SHELL);
! 935: break;
! 936: case 'U':
! 937: if ((list_pw = sudo_getpwnam(optarg)) == NULL)
! 938: errorx(1, "unknown user: %s", optarg);
! 939: break;
! 940: case 'u':
! 941: runas_user = optarg;
1.27 millert 942: break;
1.34 ! millert 943: case 'v':
! 944: if (mode && mode != MODE_VALIDATE)
! 945: usage_excl(1);
! 946: mode = MODE_VALIDATE;
1.33 millert 947: break;
1.34 ! millert 948: case 'V':
! 949: if (mode && mode != MODE_VERSION)
! 950: usage_excl(1);
! 951: mode = MODE_VERSION;
1.33 millert 952: break;
1.27 millert 953: default:
954: usage(1);
955: }
1.34 ! millert 956: } else if (!got_end_of_args && is_envar) {
1.27 millert 957: struct list_member *ev;
1.34 ! millert 958:
! 959: /* Store environment variable. */
1.27 millert 960: ev = emalloc(sizeof(*ev));
1.34 ! millert 961: ev->value = argv[optind];
1.27 millert 962: ev->next = sudo_user.env_vars;
963: sudo_user.env_vars = ev;
1.34 ! millert 964:
! 965: /* Crank optind and resume getopt. */
! 966: optind++;
1.27 millert 967: } else {
1.34 ! millert 968: /* Not an option or an environment variable -- we're done. */
1.27 millert 969: break;
1.1 millert 970: }
971: }
1.27 millert 972:
1.34 ! millert 973: NewArgc = argc - optind;
! 974: NewArgv = argv + optind;
! 975:
! 976: if (!mode)
! 977: mode = MODE_RUN;
! 978:
! 979: if (NewArgc > 0 && mode == MODE_LIST)
! 980: mode = MODE_CHECK;
! 981:
! 982: if (ISSET(flags, MODE_LOGIN_SHELL)) {
! 983: if (ISSET(flags, MODE_SHELL)) {
! 984: warningx("you may not specify both the `-i' and `-s' options");
! 985: usage(1);
! 986: }
! 987: if (ISSET(flags, MODE_PRESERVE_ENV)) {
! 988: warningx("you may not specify both the `-i' and `-E' options");
! 989: usage(1);
! 990: }
! 991: SET(flags, MODE_SHELL);
! 992: }
! 993: if (mode == MODE_EDIT &&
! 994: (ISSET(flags, MODE_PRESERVE_ENV) || sudo_user.env_vars != NULL)) {
! 995: if (ISSET(mode, MODE_PRESERVE_ENV))
! 996: warningx("the `-E' option is not valid in edit mode");
1.27 millert 997: if (sudo_user.env_vars != NULL)
1.34 ! millert 998: warningx("you may not specify environment variables in edit mode");
! 999: usage(1);
! 1000: }
! 1001: if ((runas_user != NULL || runas_group != NULL) &&
! 1002: !ISSET(mode, MODE_EDIT | MODE_RUN | MODE_CHECK)) {
1.27 millert 1003: usage(1);
1004: }
1.34 ! millert 1005: if (list_pw != NULL && mode != MODE_LIST && mode != MODE_CHECK) {
! 1006: warningx("the `-U' option may only be used with the `-l' option");
1.33 millert 1007: usage(1);
1008: }
1.34 ! millert 1009: if (ISSET(tgetpass_flags, TGP_STDIN) && ISSET(tgetpass_flags, TGP_ASKPASS)) {
! 1010: warningx("the `-A' and `-S' options may not be used together");
1.24 millert 1011: usage(1);
1012: }
1.34 ! millert 1013: if ((NewArgc == 0 && mode == MODE_EDIT) ||
! 1014: (NewArgc > 0 && !ISSET(mode, MODE_RUN | MODE_EDIT | MODE_CHECK)))
1.1 millert 1015: usage(1);
1.34 ! millert 1016: if (NewArgc == 0 && mode == MODE_RUN && !ISSET(flags, MODE_SHELL))
! 1017: SET(flags, (MODE_IMPLIED_SHELL | MODE_SHELL));
1.1 millert 1018:
1.34 ! millert 1019: return(mode | flags);
1.1 millert 1020: }
1021:
1022: /*
1.34 ! millert 1023: * Open sudoers and sanity check mode/owner/type.
! 1024: * Returns a handle to the sudoers file or NULL on error.
1.1 millert 1025: */
1.34 ! millert 1026: FILE *
! 1027: open_sudoers(sudoers, keepopen)
! 1028: const char *sudoers;
! 1029: int *keepopen;
1.1 millert 1030: {
1031: struct stat statbuf;
1.34 ! millert 1032: FILE *fp = NULL;
! 1033: int rootstat;
1.1 millert 1034:
1035: /*
1036: * Fix the mode and group on sudoers file from old default.
1.23 millert 1037: * Only works if file system is readable/writable by root.
1.1 millert 1038: */
1.34 ! millert 1039: if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 &&
1.1 millert 1040: SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 &&
1041: (statbuf.st_mode & 0007777) == 0400) {
1042:
1.34 ! millert 1043: if (chmod(sudoers, SUDOERS_MODE) == 0) {
! 1044: warningx("fixed mode on %s", sudoers);
1.23 millert 1045: SET(statbuf.st_mode, SUDOERS_MODE);
1.1 millert 1046: if (statbuf.st_gid != SUDOERS_GID) {
1.34 ! millert 1047: if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) {
! 1048: warningx("set group on %s", sudoers);
1.1 millert 1049: statbuf.st_gid = SUDOERS_GID;
1.19 millert 1050: } else
1.34 ! millert 1051: warning("unable to set group on %s", sudoers);
1.1 millert 1052: }
1.19 millert 1053: } else
1.34 ! millert 1054: warning("unable to fix mode on %s", sudoers);
1.1 millert 1055: }
1056:
1057: /*
1058: * Sanity checks on sudoers file. Must be done as sudoers
1059: * file owner. We already did a stat as root, so use that
1060: * data if we can't stat as sudoers file owner.
1061: */
1.17 millert 1062: set_perms(PERM_SUDOERS);
1.1 millert 1063:
1.34 ! millert 1064: if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0)
! 1065: log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers);
1.1 millert 1066: else if (!S_ISREG(statbuf.st_mode))
1.34 ! millert 1067: log_error(NO_EXIT, "%s is not a regular file", sudoers);
1.1 millert 1068: else if ((statbuf.st_mode & 07777) != SUDOERS_MODE)
1.34 ! millert 1069: log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers,
1.27 millert 1070: (unsigned int) (statbuf.st_mode & 07777),
1071: (unsigned int) SUDOERS_MODE);
1.1 millert 1072: else if (statbuf.st_uid != SUDOERS_UID)
1.34 ! millert 1073: log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers,
1.25 millert 1074: (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID);
1.1 millert 1075: else if (statbuf.st_gid != SUDOERS_GID)
1.34 ! millert 1076: log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers,
1.25 millert 1077: (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID);
1.34 ! millert 1078: else if ((fp = fopen(sudoers, "r")) == NULL)
! 1079: log_error(USE_ERRNO, "can't open %s", sudoers);
! 1080: else if (statbuf.st_size != 0) {
! 1081: /*
! 1082: * Make sure we can actually read sudoers so we can present the
! 1083: * user with a reasonable error message.
! 1084: */
! 1085: if (fgetc(fp) == EOF)
! 1086: log_error(USE_ERRNO, "can't read %s", sudoers);
! 1087: rewind(fp);
1.1 millert 1088: }
1.34 ! millert 1089: (void) fcntl(fileno(fp), F_SETFD, 1);
1.1 millert 1090:
1.17 millert 1091: set_perms(PERM_ROOT); /* change back to root */
1.34 ! millert 1092: return(fp);
1.1 millert 1093: }
1094:
1095: /*
1096: * Close all open files (except std*) and turn off core dumps.
1.34 ! millert 1097: * Also sets the set_perms() pointer to the correct function.
1.1 millert 1098: */
1099: static void
1100: initial_setup()
1101: {
1.27 millert 1102: int miss[3], devnull = -1;
1.33 millert 1103: #if defined(__linux__) || (defined(RLIMIT_CORE) && !defined(SUDO_DEVEL))
1.1 millert 1104: struct rlimit rl;
1.33 millert 1105: #endif
1.1 millert 1106:
1.33 millert 1107: #if defined(__linux__)
1108: /*
1109: * Unlimit the number of processes since Linux's setuid() will
1110: * apply resource limits when changing uid and return EAGAIN if
1111: * nproc would be violated by the uid switch.
1112: */
1113: rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
1114: if (setrlimit(RLIMIT_NPROC, &rl)) {
1115: if (getrlimit(RLIMIT_NPROC, &rl) == 0) {
1116: rl.rlim_cur = rl.rlim_max;
1117: (void)setrlimit(RLIMIT_NPROC, &rl);
1118: }
1119: }
1120: #endif /* __linux__ */
1121: #if defined(RLIMIT_CORE) && !defined(SUDO_DEVEL)
1.1 millert 1122: /*
1123: * Turn off core dumps.
1124: */
1.4 millert 1125: (void) getrlimit(RLIMIT_CORE, &corelimit);
1.20 millert 1126: memcpy(&rl, &corelimit, sizeof(struct rlimit));
1127: rl.rlim_cur = 0;
1.1 millert 1128: (void) setrlimit(RLIMIT_CORE, &rl);
1.20 millert 1129: #endif /* RLIMIT_CORE && !SUDO_DEVEL */
1.1 millert 1130:
1.17 millert 1131: /*
1.27 millert 1132: * stdin, stdout and stderr must be open; set them to /dev/null
1133: * if they are closed and close all other fds.
1.17 millert 1134: */
1.27 millert 1135: miss[STDIN_FILENO] = fcntl(STDIN_FILENO, F_GETFL, 0) == -1;
1136: miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
1137: miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
1138: if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
1139: if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
1140: if (miss[STDIN_FILENO])
1141: (void) dup2(devnull, STDIN_FILENO);
1142: if (miss[STDOUT_FILENO])
1143: (void) dup2(devnull, STDOUT_FILENO);
1144: if (miss[STDERR_FILENO])
1145: (void) dup2(devnull, STDERR_FILENO);
1.34 ! millert 1146: if (devnull > STDERR_FILENO)
! 1147: close(devnull);
1.27 millert 1148: }
1149: }
1.1 millert 1150: }
1151:
1.8 millert 1152: #ifdef HAVE_LOGIN_CAP_H
1153: static void
1.4 millert 1154: set_loginclass(pw)
1155: struct passwd *pw;
1156: {
1157: int errflags;
1158:
1159: /*
1160: * Don't make it a fatal error if the user didn't specify the login
1161: * class themselves. We do this because if login.conf gets
1162: * corrupted we want the admin to be able to use sudo to fix it.
1163: */
1164: if (login_class)
1165: errflags = NO_MAIL|MSG_ONLY;
1166: else
1167: errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1168:
1169: if (login_class && strcmp(login_class, "-") != 0) {
1.34 ! millert 1170: if (user_uid != 0 &&
! 1171: strcmp(runas_user ? runas_user : def_runas_default, "root") != 0)
! 1172: errorx(1, "only root can use -c %s", login_class);
1.4 millert 1173: } else {
1174: login_class = pw->pw_class;
1175: if (!login_class || !*login_class)
1176: login_class =
1177: (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS;
1178: }
1179:
1180: lc = login_getclass(login_class);
1.10 millert 1181: if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) {
1.4 millert 1182: log_error(errflags, "unknown login class: %s", login_class);
1.11 millert 1183: if (!lc)
1184: lc = login_getclass(NULL); /* needed for login_getstyle() later */
1.10 millert 1185: }
1.4 millert 1186: }
1187: #else
1.8 millert 1188: static void
1.4 millert 1189: set_loginclass(pw)
1190: struct passwd *pw;
1191: {
1192: }
1.8 millert 1193: #endif /* HAVE_LOGIN_CAP_H */
1.4 millert 1194:
1.27 millert 1195: #ifdef HAVE_PROJECT_H
1196: static void
1197: set_project(pw)
1198: struct passwd *pw;
1199: {
1200: int errflags = NO_MAIL|MSG_ONLY|NO_EXIT;
1201: int errval;
1202: struct project proj;
1203: struct project *resultp = '\0';
1204: char buf[1024];
1205:
1206: /*
1207: * Collect the default project for the user and settaskid
1208: */
1209: setprojent();
1210: if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) {
1211: errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL);
1212: if (errval != 0) {
1213: switch(errval) {
1214: case SETPROJ_ERR_TASK:
1215: if (errno == EAGAIN)
1216: log_error(errflags, "resource control limit has been reached");
1217: else if (errno == ESRCH)
1218: log_error(errflags, "user \"%s\" is not a member of "
1219: "project \"%s\"", pw->pw_name, resultp->pj_name);
1220: else if (errno == EACCES)
1221: log_error(errflags, "the invoking task is final");
1222: else
1223: log_error(errflags, "could not join project \"%s\"",
1224: resultp->pj_name);
1225: break;
1226: case SETPROJ_ERR_POOL:
1227: if (errno == EACCES)
1228: log_error(errflags, "no resource pool accepting "
1229: "default bindings exists for project \"%s\"",
1230: resultp->pj_name);
1231: else if (errno == ESRCH)
1232: log_error(errflags, "specified resource pool does "
1233: "not exist for project \"%s\"", resultp->pj_name);
1234: else
1235: log_error(errflags, "could not bind to default "
1236: "resource pool for project \"%s\"", resultp->pj_name);
1237: break;
1238: default:
1239: if (errval <= 0) {
1240: log_error(errflags, "setproject failed for project \"%s\"",
1241: resultp->pj_name);
1242: } else {
1243: log_error(errflags, "warning, resource control assignment "
1244: "failed for project \"%s\"", resultp->pj_name);
1245: }
1246: }
1247: }
1248: } else {
1249: log_error(errflags, "getdefaultproj() error: %s", strerror(errno));
1250: }
1251: endprojent();
1252: }
1253: #else
1254: static void
1255: set_project(pw)
1256: struct passwd *pw;
1257: {
1258: }
1259: #endif /* HAVE_PROJECT_H */
1260:
1.1 millert 1261: /*
1.2 millert 1262: * Look up the fully qualified domain name and set user_host and user_shost.
1263: */
1264: void
1265: set_fqdn()
1266: {
1.28 millert 1267: #ifdef HAVE_GETADDRINFO
1268: struct addrinfo *res0, hint;
1269: #else
1.2 millert 1270: struct hostent *hp;
1.28 millert 1271: #endif
1.2 millert 1272: char *p;
1273:
1.28 millert 1274: #ifdef HAVE_GETADDRINFO
1.34 ! millert 1275: zero_bytes(&hint, sizeof(hint));
1.28 millert 1276: hint.ai_family = PF_UNSPEC;
1277: hint.ai_flags = AI_CANONNAME;
1278: if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) {
1279: #else
1.14 millert 1280: if (!(hp = gethostbyname(user_host))) {
1.28 millert 1281: #endif
1.14 millert 1282: log_error(MSG_ONLY|NO_EXIT,
1.28 millert 1283: "unable to resolve host %s", user_host);
1.14 millert 1284: } else {
1285: if (user_shost != user_host)
1.27 millert 1286: efree(user_shost);
1287: efree(user_host);
1.28 millert 1288: #ifdef HAVE_GETADDRINFO
1289: user_host = estrdup(res0->ai_canonname);
1290: freeaddrinfo(res0);
1291: #else
1.14 millert 1292: user_host = estrdup(hp->h_name);
1.28 millert 1293: #endif
1.2 millert 1294: }
1295: if ((p = strchr(user_host, '.'))) {
1296: *p = '\0';
1297: user_shost = estrdup(user_host);
1298: *p = '.';
1299: } else {
1300: user_shost = user_host;
1301: }
1302: }
1303:
1304: /*
1.23 millert 1305: * Get passwd entry for the user we are going to run commands as.
1306: * By default, this is "root". Updates runas_pw as a side effect.
1307: */
1.34 ! millert 1308: static void
1.23 millert 1309: set_runaspw(user)
1310: char *user;
1311: {
1.34 ! millert 1312: if (*user == '#') {
! 1313: if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL)
! 1314: runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0);
! 1315: } else {
! 1316: if ((runas_pw = sudo_getpwnam(user)) == NULL)
! 1317: log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user);
1.23 millert 1318: }
1.34 ! millert 1319: }
! 1320:
! 1321: /*
! 1322: * Get group entry for the group we are going to run commands as.
! 1323: * Updates runas_pw as a side effect.
! 1324: */
! 1325: static void
! 1326: set_runasgr(group)
! 1327: char *group;
! 1328: {
! 1329: if (*group == '#') {
! 1330: if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL)
! 1331: runas_gr = sudo_fakegrnam(group);
1.23 millert 1332: } else {
1.34 ! millert 1333: if ((runas_gr = sudo_getgrnam(group)) == NULL)
! 1334: log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group);
1.23 millert 1335: }
1336: }
1337:
1338: /*
1.6 millert 1339: * Get passwd entry for the user we are going to authenticate as.
1.23 millert 1340: * By default, this is the user invoking sudo. In the most common
1341: * case, this matches sudo_user.pw or runas_pw.
1.4 millert 1342: */
1.6 millert 1343: static struct passwd *
1344: get_authpw()
1.4 millert 1345: {
1346: struct passwd *pw;
1347:
1.23 millert 1348: if (def_rootpw) {
1.34 ! millert 1349: if ((pw = sudo_getpwuid(0)) == NULL)
! 1350: log_error(0, "unknown uid: 0");
1.23 millert 1351: } else if (def_runaspw) {
1.34 ! millert 1352: if ((pw = sudo_getpwnam(def_runas_default)) == NULL)
! 1353: log_error(0, "unknown user: %s", def_runas_default);
1.23 millert 1354: } else if (def_targetpw) {
1355: if (runas_pw->pw_name == NULL)
1.34 ! millert 1356: log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu",
1.25 millert 1357: (unsigned long) runas_pw->pw_uid);
1.23 millert 1358: pw = runas_pw;
1.6 millert 1359: } else
1360: pw = sudo_user.pw;
1361:
1362: return(pw);
1.4 millert 1363: }
1364:
1365: /*
1.34 ! millert 1366: * Cleanup hook for error()/errorx()
! 1367: */
! 1368: void
! 1369: cleanup(gotsignal)
! 1370: int gotsignal;
! 1371: {
! 1372: struct sudo_nss *nss;
! 1373:
! 1374: if (!gotsignal) {
! 1375: if (snl != NULL) {
! 1376: tq_foreach_fwd(snl, nss)
! 1377: nss->close(nss);
! 1378: }
! 1379: sudo_endpwent();
! 1380: sudo_endgrent();
! 1381: }
! 1382: }
! 1383:
! 1384: static void
! 1385: show_version()
! 1386: {
! 1387: (void) printf("Sudo version %s\n", version);
! 1388: if (getuid() == 0) {
! 1389: putchar('\n');
! 1390: (void) printf("Sudoers path: %s\n", _PATH_SUDOERS);
! 1391: #ifdef HAVE_LDAP
! 1392: # ifdef _PATH_NSSWITCH_CONF
! 1393: (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF);
! 1394: # endif
! 1395: (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF);
! 1396: (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET);
! 1397: #endif
! 1398: dump_auth_methods();
! 1399: dump_defaults();
! 1400: dump_interfaces();
! 1401: }
! 1402: exit(0);
! 1403: }
! 1404:
! 1405: /*
1.1 millert 1406: * Tell which options are mutually exclusive and exit.
1407: */
1408: static void
1409: usage_excl(exit_val)
1410: int exit_val;
1411: {
1.34 ! millert 1412: warningx("Only one of the -e, -h, -i, -k, -K, -l, -s, -v or -V options may be specified");
1.1 millert 1413: usage(exit_val);
1414: }
1415:
1416: /*
1417: * Give usage message and exit.
1.34 ! millert 1418: * The actual usage strings are in sudo_usage.h for configure substitution.
1.1 millert 1419: */
1420: static void
1421: usage(exit_val)
1422: int exit_val;
1423: {
1.34 ! millert 1424: struct lbuf lbuf;
! 1425: char *uvec[5];
! 1426: int i, ulen;
1.23 millert 1427:
1428: /*
1.27 millert 1429: * Use usage vectors appropriate to the progname.
1.23 millert 1430: */
1431: if (strcmp(getprogname(), "sudoedit") == 0) {
1.34 ! millert 1432: uvec[0] = SUDO_USAGE4 + 3;
1.27 millert 1433: uvec[1] = NULL;
1.23 millert 1434: } else {
1.34 ! millert 1435: uvec[0] = SUDO_USAGE1;
! 1436: uvec[1] = SUDO_USAGE2;
! 1437: uvec[2] = SUDO_USAGE3;
! 1438: uvec[3] = SUDO_USAGE4;
! 1439: uvec[4] = NULL;
1.23 millert 1440: }
1441:
1442: /*
1.34 ! millert 1443: * Print usage and wrap lines as needed, depending on the
! 1444: * tty width.
1.23 millert 1445: */
1.34 ! millert 1446: ulen = (int)strlen(getprogname()) + 8;
! 1447: lbuf_init(&lbuf, NULL, ulen, 0);
1.27 millert 1448: for (i = 0; uvec[i] != NULL; i++) {
1.34 ! millert 1449: lbuf_append(&lbuf, "usage: ", getprogname(), uvec[i], NULL);
! 1450: lbuf_print(&lbuf);
1.23 millert 1451: }
1.34 ! millert 1452: lbuf_destroy(&lbuf);
1.1 millert 1453: exit(exit_val);
1454: }
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