Annotation of src/usr.bin/login/login.c, Revision 1.68
1.68 ! beck 1: /* $OpenBSD: login.c,v 1.67 2015/12/26 20:51:35 guenther Exp $ */
1.3 deraadt 2: /* $NetBSD: login.c,v 1.13 1996/05/15 23:50:16 jtc Exp $ */
1.1 deraadt 3:
4: /*-
5: * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.50 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
1.36 millert 32: /*-
33: * Copyright (c) 1995 Berkeley Software Design, Inc. All rights reserved.
34: *
35: * Redistribution and use in source and binary forms, with or without
36: * modification, are permitted provided that the following conditions
37: * are met:
38: * 1. Redistributions of source code must retain the above copyright
39: * notice, this list of conditions and the following disclaimer.
40: * 2. Redistributions in binary form must reproduce the above copyright
41: * notice, this list of conditions and the following disclaimer in the
42: * documentation and/or other materials provided with the distribution.
43: * 3. All advertising materials mentioning features or use of this software
44: * must display the following acknowledgement:
45: * This product includes software developed by Berkeley Software Design,
46: * Inc.
47: * 4. The name of Berkeley Software Design, Inc. may not be used to endorse
48: * or promote products derived from this software without specific prior
49: * written permission.
50: *
51: * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54: * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61: * SUCH DAMAGE.
62: *
63: * BSDI $From: login.c,v 2.28 1999/09/08 22:35:36 prb Exp $
64: */
1.1 deraadt 65:
66: /*
67: * login [ name ]
68: * login -h hostname (for telnetd, etc.)
69: * login -f name (for pre-authenticated login: datakit, xterm, etc.)
1.49 millert 70: * login -p (preserve existing environment; for getty)
1.1 deraadt 71: */
72:
1.36 millert 73: #include <sys/socket.h>
1.1 deraadt 74: #include <sys/stat.h>
75: #include <sys/time.h>
76: #include <sys/resource.h>
1.11 millert 77: #include <sys/wait.h>
1.1 deraadt 78:
79: #include <err.h>
80: #include <errno.h>
1.27 millert 81: #include <fcntl.h>
1.1 deraadt 82: #include <grp.h>
1.30 millert 83: #include <login_cap.h>
1.36 millert 84: #include <netdb.h>
1.1 deraadt 85: #include <pwd.h>
86: #include <signal.h>
1.36 millert 87: #include <stdarg.h>
1.1 deraadt 88: #include <stdio.h>
89: #include <stdlib.h>
90: #include <string.h>
91: #include <syslog.h>
92: #include <ttyent.h>
93: #include <unistd.h>
1.63 deraadt 94: #include <limits.h>
1.1 deraadt 95: #include <utmp.h>
1.3 deraadt 96: #include <util.h>
1.36 millert 97: #include <bsd_auth.h>
98:
1.1 deraadt 99: #include "pathnames.h"
100:
1.45 millert 101: void badlogin(char *);
102: void dolastlog(int);
103: void getloginname(void);
104: void motd(void);
105: void quickexit(int);
106: int rootterm(char *);
107: void sigint(int);
108: void sighup(int);
109: void sleepexit(int);
110: char *stypeof(char *);
111: void timedout(int);
112: int main(int, char **);
1.1 deraadt 113:
1.45 millert 114: extern int check_failedlogin(uid_t);
115: extern void log_failedlogin(uid_t, char *, char *, char *);
1.1 deraadt 116:
117: #define TTYGRPNAME "tty" /* name of group to own ttys */
118:
1.64 millert 119: #define SECSPERDAY (24 * 60 * 60)
120: #define TWOWEEKS (2 * 7 * SECSPERDAY)
121:
1.1 deraadt 122: /*
1.37 millert 123: * This bounds the time given to login; may be overridden by /etc/login.conf.
1.1 deraadt 124: */
1.30 millert 125: u_int timeout = 300;
1.1 deraadt 126:
1.36 millert 127: struct passwd *pwd;
1.30 millert 128: login_cap_t *lc = NULL;
1.36 millert 129: auth_session_t *as = NULL;
1.30 millert 130: int failures;
1.36 millert 131: int needbanner = 1;
1.30 millert 132: char term[64], *hostname, *tty;
1.36 millert 133: char *style;
1.30 millert 134: char *username = NULL, *rusername = NULL;
1.1 deraadt 135:
1.47 deraadt 136: extern char **environ;
137:
1.1 deraadt 138: int
1.47 deraadt 139: main(int argc, char *argv[])
1.1 deraadt 140: {
1.47 deraadt 141: char *domain, *p, *ttyn, *shell, *fullname, *instance;
142: char *lipaddr, *script, *ripaddr, *style, *type, *fqdn;
1.63 deraadt 143: char tbuf[PATH_MAX + 2], tname[sizeof(_PATH_TTY) + 10];
144: char localhost[HOST_NAME_MAX+1], *copyright;
1.59 martynas 145: char mail[sizeof(_PATH_MAILDIR) + 1 + NAME_MAX];
1.47 deraadt 146: int ask, ch, cnt, fflag, pflag, quietlog, rootlogin, lastchance;
147: int error, homeless, needto, authok, tries, backoff;
1.36 millert 148: struct addrinfo *ai, hints;
1.47 deraadt 149: struct rlimit cds, scds;
150: quad_t expire, warning;
151: struct utmp utmp;
1.1 deraadt 152: struct group *gr;
153: struct stat st;
154: uid_t uid;
155:
156: openlog("login", LOG_ODELAY, LOG_AUTH);
157:
1.37 millert 158: fqdn = lipaddr = ripaddr = fullname = type = NULL;
159: authok = 0;
160: tries = 10;
161: backoff = 3;
1.36 millert 162:
1.1 deraadt 163: domain = NULL;
1.49 millert 164: if (gethostname(localhost, sizeof(localhost)) < 0) {
1.1 deraadt 165: syslog(LOG_ERR, "couldn't get local hostname: %m");
1.49 millert 166: strlcpy(localhost, "localhost", sizeof(localhost));
167: } else if ((domain = strchr(localhost, '.'))) {
1.21 deraadt 168: domain++;
169: if (*domain && strchr(domain, '.') == NULL)
170: domain = localhost;
171: }
1.1 deraadt 172:
1.36 millert 173: if ((as = auth_open()) == NULL) {
1.39 millert 174: syslog(LOG_ERR, "auth_open: %m");
175: err(1, "unable to initialize BSD authentication");
1.36 millert 176: }
1.39 millert 177: auth_setoption(as, "login", "yes");
1.36 millert 178:
1.49 millert 179: /*
180: * -p is used by getty to tell login not to destroy the environment
181: * -f is used to skip a second login authentication
182: * -h is used by other servers to pass the name of the remote
183: * host to login so that it may be placed in utmp and wtmp
184: */
1.36 millert 185: fflag = pflag = 0;
1.1 deraadt 186: uid = getuid();
1.36 millert 187: while ((ch = getopt(argc, argv, "fh:pu:L:R:")) != -1)
1.1 deraadt 188: switch (ch) {
189: case 'f':
190: fflag = 1;
191: break;
192: case 'h':
1.36 millert 193: if (uid) {
1.62 guenther 194: warnc(EPERM, "-h option");
1.36 millert 195: quickexit(1);
196: }
1.60 tobias 197: free(fqdn);
1.36 millert 198: if ((fqdn = strdup(optarg)) == NULL) {
199: warn(NULL);
200: quickexit(1);
201: }
202: auth_setoption(as, "fqdn", fqdn);
1.1 deraadt 203: if (domain && (p = strchr(optarg, '.')) &&
1.21 deraadt 204: strcasecmp(p+1, domain) == 0)
1.1 deraadt 205: *p = 0;
206: hostname = optarg;
1.36 millert 207: auth_setoption(as, "hostname", hostname);
208: break;
209: case 'L':
210: if (uid) {
1.62 guenther 211: warnc(EPERM, "-L option");
1.36 millert 212: quickexit(1);
213: }
214: if (lipaddr) {
215: warnx("duplicate -L option");
216: quickexit(1);
217: }
218: lipaddr = optarg;
219: memset(&hints, 0, sizeof(hints));
220: hints.ai_family = PF_UNSPEC;
221: hints.ai_flags = AI_CANONNAME;
222: error = getaddrinfo(lipaddr, NULL, &hints, &ai);
223: if (!error) {
224: strlcpy(localhost, ai->ai_canonname,
225: sizeof(localhost));
226: freeaddrinfo(ai);
227: } else
228: strlcpy(localhost, lipaddr, sizeof(localhost));
229: auth_setoption(as, "local_addr", lipaddr);
1.1 deraadt 230: break;
231: case 'p':
232: pflag = 1;
233: break;
1.36 millert 234: case 'R':
235: if (uid) {
1.62 guenther 236: warnc(EPERM, "-R option");
1.36 millert 237: quickexit(1);
238: }
239: if (ripaddr) {
240: warnx("duplicate -R option");
241: quickexit(1);
242: }
243: ripaddr = optarg;
244: auth_setoption(as, "remote_addr", ripaddr);
245: break;
1.14 millert 246: case 'u':
1.36 millert 247: if (uid) {
1.62 guenther 248: warnc(EPERM, "-u option");
1.36 millert 249: quickexit(1);
250: }
1.14 millert 251: rusername = optarg;
252: break;
1.1 deraadt 253: default:
254: if (!uid)
255: syslog(LOG_ERR, "invalid flag %c", ch);
256: (void)fprintf(stderr,
1.57 jmc 257: "usage: login [-fp] [-h hostname] [-L local-addr] "
258: "[-R remote-addr] [-u username]\n\t[user]\n");
1.36 millert 259: quickexit(1);
1.1 deraadt 260: }
261: argc -= optind;
262: argv += optind;
263:
264: if (*argv) {
265: username = *argv;
266: ask = 0;
267: } else
268: ask = 1;
269:
1.49 millert 270: /*
271: * If effective user is not root, just run su(1) to emulate login(1).
272: */
273: if (geteuid() != 0) {
274: char *av[5], **ap;
275:
276: auth_close(as);
277: closelog();
1.54 millert 278: closefrom(STDERR_FILENO + 1);
1.49 millert 279:
280: ap = av;
281: *ap++ = _PATH_SU;
282: *ap++ = "-L";
283: if (!pflag)
284: *ap++ = "-l";
285: if (!ask)
286: *ap++ = username;
287: *ap = NULL;
288: execv(_PATH_SU, av);
289: warn("unable to exec %s", _PATH_SU);
290: _exit(1);
291: }
292:
1.1 deraadt 293: ttyn = ttyname(STDIN_FILENO);
294: if (ttyn == NULL || *ttyn == '\0') {
295: (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
296: ttyn = tname;
297: }
1.12 millert 298: if ((tty = strrchr(ttyn, '/')))
1.1 deraadt 299: ++tty;
300: else
301: tty = ttyn;
302:
1.49 millert 303: /*
304: * Since login deals with sensitive information, turn off coredumps.
305: */
306: if (getrlimit(RLIMIT_CORE, &scds) < 0) {
307: syslog(LOG_ERR, "couldn't get core dump size: %m");
308: scds.rlim_cur = scds.rlim_max = QUAD_MIN;
309: }
310: cds.rlim_cur = cds.rlim_max = 0;
311: if (setrlimit(RLIMIT_CORE, &cds) < 0) {
312: syslog(LOG_ERR, "couldn't set core dump size to 0: %m");
313: scds.rlim_cur = scds.rlim_max = QUAD_MIN;
314: }
315:
316: (void)signal(SIGALRM, timedout);
317: if (argc > 1) {
318: needto = 0;
319: (void)alarm(timeout);
320: } else
321: needto = 1;
322: (void)signal(SIGQUIT, SIG_IGN);
323: (void)signal(SIGINT, SIG_IGN);
324: (void)signal(SIGHUP, SIG_IGN);
325: (void)setpriority(PRIO_PROCESS, 0, 0);
1.36 millert 326:
327: /* get the default login class */
1.47 deraadt 328: if ((lc = login_getclass(0)) == NULL) { /* get the default class */
1.36 millert 329: warnx("Failure to retrieve default class");
330: quickexit(1);
331: }
1.37 millert 332: timeout = (u_int)login_getcapnum(lc, "login-timeout", 300, 300);
1.36 millert 333: if ((script = login_getcapstr(lc, "classify", NULL, NULL)) != NULL) {
334: unsetenv("AUTH_TYPE");
335: unsetenv("REMOTE_NAME");
336: if (script[0] != '/') {
337: syslog(LOG_ERR, "Invalid classify script: %s", script);
338: warnx("Classification failure");
339: quickexit(1);
340: }
341: shell = strrchr(script, '/') + 1;
342: auth_setstate(as, AUTH_OKAY);
1.47 deraadt 343: auth_call(as, script, shell,
1.49 millert 344: fflag ? "-f" : username, fflag ? username : 0, (char *)0);
1.36 millert 345: if (!(auth_getstate(as) & AUTH_ALLOW))
346: quickexit(1);
347: auth_setenv(as);
348: if ((p = getenv("AUTH_TYPE")) != NULL &&
349: strncmp(p, "auth-", 5) == 0)
350: type = p;
351: if ((p = getenv("REMOTE_NAME")) != NULL)
352: hostname = p;
353: /*
354: * we may have changed some values, reset them
355: */
356: auth_clroptions(as);
357: if (type)
358: auth_setoption(as, "auth_type", type);
359: if (fqdn)
360: auth_setoption(as, "fqdn", fqdn);
361: if (hostname)
362: auth_setoption(as, "hostname", hostname);
363: if (lipaddr)
364: auth_setoption(as, "local_addr", lipaddr);
365: if (ripaddr)
366: auth_setoption(as, "remote_addr", ripaddr);
367: }
368:
369: /*
370: * Request the things like the approval script print things
371: * to stdout (in particular, the nologins files)
372: */
373: auth_setitem(as, AUTHV_INTERACTIVE, "True");
374:
1.1 deraadt 375: for (cnt = 0;; ask = 1) {
1.36 millert 376: /*
377: * Clean up our current authentication session.
378: * Options are not cleared so we need to clear any
379: * we might set below.
380: */
381: auth_clean(as);
382: auth_clroption(as, "style");
383: auth_clroption(as, "lastchance");
384:
385: lastchance = 0;
386:
1.1 deraadt 387: if (ask) {
388: fflag = 0;
389: getloginname();
390: }
1.36 millert 391: if (needto) {
392: needto = 0;
393: alarm(timeout);
394: }
1.47 deraadt 395: if ((style = strchr(username, ':')) != NULL)
1.36 millert 396: *style++ = '\0';
1.66 mmcc 397: free(fullname);
1.36 millert 398: if (auth_setitem(as, AUTHV_NAME, username) < 0 ||
399: (fullname = strdup(username)) == NULL) {
400: syslog(LOG_ERR, "%m");
401: warn(NULL);
402: quickexit(1);
403: }
1.1 deraadt 404: rootlogin = 0;
1.55 millert 405: if ((instance = strchr(username, '/')) != NULL) {
1.40 millert 406: if (strncmp(instance + 1, "root", 4) == 0)
1.1 deraadt 407: rootlogin = 1;
408: *instance++ = '\0';
409: } else
410: instance = "";
1.36 millert 411:
1.1 deraadt 412: if (strlen(username) > UT_NAMESIZE)
413: username[UT_NAMESIZE] = '\0';
414:
415: /*
416: * Note if trying multiple user names; log failures for
417: * previous user name, but don't bother logging one failure
418: * for nonexistent name (mistyped username).
419: */
420: if (failures && strcmp(tbuf, username)) {
421: if (failures > (pwd ? 0 : 1))
422: badlogin(tbuf);
423: failures = 0;
424: }
1.36 millert 425: (void)strlcpy(tbuf, username, sizeof(tbuf));
1.1 deraadt 426:
1.36 millert 427: if ((pwd = getpwnam(username)) != NULL &&
428: auth_setpwd(as, pwd) < 0) {
429: syslog(LOG_ERR, "%m");
430: warn(NULL);
431: quickexit(1);
432: }
1.1 deraadt 433:
1.36 millert 434: lc = login_getclass(pwd ? pwd->pw_class : NULL);
435: if (!lc)
436: goto failed;
1.1 deraadt 437:
1.36 millert 438: style = login_getstyle(lc, style, type);
439: if (!style)
440: goto failed;
1.1 deraadt 441:
1.36 millert 442: /*
1.37 millert 443: * We allow "login-tries" attempts to login but start
444: * slowing down after "login-backoff" attempts.
445: */
446: tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
447: backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
448:
449: /*
1.60 tobias 450: * Turn off the fflag if we have an invalid user
1.36 millert 451: * or we are not root and we are trying to change uids.
452: */
453: if (!pwd || (uid && uid != pwd->pw_uid))
454: fflag = 0;
1.1 deraadt 455:
1.36 millert 456: if (pwd && pwd->pw_uid == 0)
457: rootlogin = 1;
1.25 millert 458:
1.36 millert 459: /*
460: * If we do not have the force flag authenticate the user
461: */
1.44 millert 462: if (!fflag) {
1.36 millert 463: lastchance =
464: login_getcaptime(lc, "password-dead", 0, 0) != 0;
465: if (lastchance)
466: auth_setoption(as, "lastchance", "yes");
467: /*
468: * Once we start asking for a password
469: * we want to log a failure on a hup.
470: */
471: signal(SIGHUP, sighup);
472: auth_verify(as, style, NULL, lc->lc_class, NULL);
473: authok = auth_getstate(as);
474: /*
475: * If their password expired and it has not been
476: * too long since then, give the user one last
477: * chance to change their password
478: */
479: if ((authok & AUTH_PWEXPIRED) && lastchance) {
480: authok = AUTH_OKAY;
481: } else
482: lastchance = 0;
483: if ((authok & AUTH_ALLOW) == 0)
484: goto failed;
485: if (auth_setoption(as, "style", style) < 0) {
486: syslog(LOG_ERR, "%m");
487: warn(NULL);
488: quickexit(1);
1.25 millert 489: }
1.1 deraadt 490: }
1.36 millert 491: /*
492: * explicitly reject users without password file entries
493: */
1.47 deraadt 494: if (pwd == NULL)
1.36 millert 495: goto failed;
1.1 deraadt 496:
497: /*
1.36 millert 498: * If trying to log in as root on an insecure terminal,
499: * refuse the login attempt unless the authentication
500: * style explicitly says a root login is okay.
1.1 deraadt 501: */
1.44 millert 502: if (pwd && rootlogin && !rootterm(tty))
1.36 millert 503: goto failed;
1.29 millert 504:
1.36 millert 505: if (fflag) {
506: type = 0;
507: style = "forced";
508: }
509: break;
510:
511: failed:
512: if (authok & AUTH_SILENT)
513: quickexit(0);
1.29 millert 514: if (rootlogin && !rootterm(tty)) {
1.36 millert 515: warnx("%s login refused on this terminal.",
516: fullname);
1.1 deraadt 517: if (hostname)
518: syslog(LOG_NOTICE,
1.14 millert 519: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
1.36 millert 520: fullname, rusername ? rusername : "",
1.14 millert 521: rusername ? "@" : "", hostname, tty);
1.1 deraadt 522: else
523: syslog(LOG_NOTICE,
524: "LOGIN %s REFUSED ON TTY %s",
1.47 deraadt 525: fullname, tty);
1.36 millert 526: } else {
527: if (!as || (p = auth_getvalue(as, "errormsg")) == NULL)
528: p = "Login incorrect";
529: (void)printf("%s\n", p);
530: }
1.1 deraadt 531: failures++;
1.13 millert 532: if (pwd)
1.14 millert 533: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.37 millert 534: /*
535: * By default, we allow 10 tries, but after 3 we start
536: * backing off to slow down password guessers.
537: */
538: if (++cnt > backoff) {
539: if (cnt >= tries) {
1.1 deraadt 540: badlogin(username);
541: sleepexit(1);
542: }
1.68 ! beck 543: sleep(1);
1.1 deraadt 544: }
545: }
546:
547: /* committed to login -- turn off timeout */
1.36 millert 548: (void)alarm(0);
1.1 deraadt 549:
550: endpwent();
551:
1.30 millert 552: shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
553: if (*shell == '\0')
554: shell = _PATH_BSHELL;
1.63 deraadt 555: else if (strlen(shell) >= PATH_MAX) {
1.30 millert 556: syslog(LOG_ERR, "shell path too long: %s", shell);
557: warnx("invalid shell");
1.36 millert 558: quickexit(1);
1.24 art 559: }
1.1 deraadt 560:
561: /* Destroy environment unless user has requested its preservation. */
1.24 art 562: if (!pflag) {
1.22 deraadt 563: if ((environ = calloc(1, sizeof (char *))) == NULL)
564: err(1, "calloc");
1.24 art 565: } else {
1.9 millert 566: char **cpp, **cpp2;
567:
568: for (cpp2 = cpp = environ; *cpp; cpp++) {
569: if (strncmp(*cpp, "LD_", 3) &&
1.29 millert 570: strncmp(*cpp, "ENV=", 4) &&
571: strncmp(*cpp, "BASH_ENV=", 9) &&
1.9 millert 572: strncmp(*cpp, "IFS=", 4))
573: *cpp2++ = *cpp;
574: }
575: *cpp2 = 0;
576: }
1.30 millert 577: /* Note: setusercontext(3) will set PATH */
1.34 deraadt 578: if (setenv("HOME", pwd->pw_dir, 1) == -1 ||
1.58 martynas 579: setenv("SHELL", pwd->pw_shell, 1) == -1) {
1.34 deraadt 580: warn("unable to setenv()");
1.36 millert 581: quickexit(1);
1.34 deraadt 582: }
1.1 deraadt 583: if (term[0] == '\0')
1.29 millert 584: (void)strlcpy(term, stypeof(tty), sizeof(term));
1.59 martynas 585: (void)snprintf(mail, sizeof(mail), "%s/%s", _PATH_MAILDIR,
586: pwd->pw_name);
1.34 deraadt 587: if (setenv("TERM", term, 0) == -1 ||
588: setenv("LOGNAME", pwd->pw_name, 1) == -1 ||
1.59 martynas 589: setenv("USER", pwd->pw_name, 1) == -1 ||
590: setenv("MAIL", mail, 1) == -1) {
1.34 deraadt 591: warn("unable to setenv()");
1.36 millert 592: quickexit(1);
1.34 deraadt 593: }
594: if (hostname) {
595: if (setenv("REMOTEHOST", hostname, 1) == -1) {
596: warn("unable to setenv()");
1.36 millert 597: quickexit(1);
1.34 deraadt 598: }
599: }
600: if (rusername) {
601: if (setenv("REMOTEUSER", rusername, 1) == -1) {
602: warn("unable to setenv()");
1.36 millert 603: quickexit(1);
1.34 deraadt 604: }
605: }
1.36 millert 606:
607: if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH)) {
608: warn("unable to set user context");
609: quickexit(1);
610: }
611: auth_setenv(as);
612:
613: /* if user not super-user, check for disabled logins */
614: if (!rootlogin)
615: auth_checknologin(lc);
616:
617: setegid(pwd->pw_gid);
618: seteuid(pwd->pw_uid);
619:
620: homeless = chdir(pwd->pw_dir);
621: if (homeless) {
622: if (login_getcapbool(lc, "requirehome", 0)) {
623: (void)printf("No home directory %s!\n", pwd->pw_dir);
624: quickexit(1);
1.34 deraadt 625: }
1.36 millert 626: if (chdir("/"))
627: quickexit(0);
1.34 deraadt 628: }
1.36 millert 629:
630: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
631: login_getcapbool(lc, "hushlogin", 0) ||
632: (access(_PATH_HUSHLOGIN, F_OK) == 0));
633:
634: seteuid(0);
635: setegid(0); /* XXX use a saved gid instead? */
636:
637: if ((p = auth_getvalue(as, "warnmsg")) != NULL)
638: (void)printf("WARNING: %s\n\n", p);
639:
640: expire = auth_check_expire(as);
641: if (expire < 0) {
642: (void)printf("Sorry -- your account has expired.\n");
643: quickexit(1);
644: } else if (expire > 0 && !quietlog) {
645: warning = login_getcaptime(lc, "expire-warn",
1.64 millert 646: TWOWEEKS, TWOWEEKS);
1.36 millert 647: if (expire < warning)
1.47 deraadt 648: (void)printf("Warning: your account expires on %s",
1.36 millert 649: ctime(&pwd->pw_expire));
1.34 deraadt 650: }
1.36 millert 651:
652: /* Nothing else left to fail -- really log in. */
653: (void)signal(SIGHUP, SIG_DFL);
654: memset(&utmp, 0, sizeof(utmp));
655: (void)time(&utmp.ut_time);
656: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
657: if (hostname)
658: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
659: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
660: login(&utmp);
661:
662: if (!quietlog)
663: (void)check_failedlogin(pwd->pw_uid);
664: dolastlog(quietlog);
665:
666: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
667:
668: (void)chown(ttyn, pwd->pw_uid,
669: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
670:
1.1 deraadt 671: /* If fflag is on, assume caller/authenticator has logged root login. */
1.24 art 672: if (rootlogin && fflag == 0) {
1.1 deraadt 673: if (hostname)
1.14 millert 674: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
675: username, tty, rusername ? rusername : "",
676: rusername ? "@" : "", hostname);
1.1 deraadt 677: else
678: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
1.24 art 679: }
1.1 deraadt 680:
681: if (!quietlog) {
1.36 millert 682: if ((copyright =
683: login_getcapstr(lc, "copyright", NULL, NULL)) != NULL)
684: auth_cat(copyright);
1.1 deraadt 685: motd();
1.59 martynas 686: if (stat(mail, &st) == 0 && st.st_size != 0)
1.1 deraadt 687: (void)printf("You have %smail.\n",
688: (st.st_mtime > st.st_atime) ? "new " : "");
689: }
690:
691: (void)signal(SIGALRM, SIG_DFL);
692: (void)signal(SIGQUIT, SIG_DFL);
1.36 millert 693: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 694: (void)signal(SIGINT, SIG_DFL);
695: (void)signal(SIGTSTP, SIG_IGN);
696:
697: tbuf[0] = '-';
1.30 millert 698: (void)strlcpy(tbuf + 1, (p = strrchr(shell, '/')) ?
1.36 millert 699: p + 1 : shell, sizeof(tbuf) - 1);
700:
701: if ((scds.rlim_cur != QUAD_MIN || scds.rlim_max != QUAD_MIN) &&
702: setrlimit(RLIMIT_CORE, &scds) < 0)
703: syslog(LOG_ERR, "couldn't reset core dump size: %m");
704:
705: if (lastchance)
1.47 deraadt 706: (void)printf("WARNING: Your password has expired."
707: " You must change your password, now!\n");
1.1 deraadt 708:
1.38 millert 709: if (setusercontext(lc, pwd, rootlogin ? 0 : pwd->pw_uid,
1.36 millert 710: LOGIN_SETALL & ~LOGIN_SETPATH) < 0) {
1.30 millert 711: warn("unable to set user context");
1.36 millert 712: quickexit(1);
713: }
714:
715: if (homeless) {
716: (void)printf("No home directory %s!\n", pwd->pw_dir);
717: (void)printf("Logging in with home = \"/\".\n");
718: (void)setenv("HOME", "/", 1);
1.15 tholo 719: }
1.30 millert 720:
1.36 millert 721: if (auth_approval(as, lc, NULL, "login") == 0) {
722: if (auth_getstate(as) & AUTH_EXPIRED)
723: (void)printf("Sorry -- your account has expired.\n");
724: else
725: (void)printf("approval failure\n");
726: quickexit(1);
727: }
728:
729: /*
730: * The last thing we do is discard all of the open file descriptors.
731: * Last because the C library may have some open.
732: */
1.53 deraadt 733: closefrom(STDERR_FILENO + 1);
1.36 millert 734:
735: /*
736: * Close the authentication session, make sure it is marked
737: * as okay so no files are removed.
738: */
739: auth_setstate(as, AUTH_OKAY);
740: auth_close(as);
741:
1.42 deraadt 742: execlp(shell, tbuf, (char *)NULL);
1.30 millert 743: err(1, "%s", shell);
1.1 deraadt 744: }
745:
746: /*
1.36 millert 747: * Allow for a '.' and 16 characters for any instance as well as
1.60 tobias 748: * space for a ':' and 16 characters defining the authentication type.
1.1 deraadt 749: */
1.36 millert 750: #define NBUFSIZ (UT_NAMESIZE + 1 + 16 + 1 + 16)
1.1 deraadt 751:
752: void
1.47 deraadt 753: getloginname(void)
1.1 deraadt 754: {
1.47 deraadt 755: static char nbuf[NBUFSIZ], *p;
1.1 deraadt 756: int ch;
757:
758: for (;;) {
759: (void)printf("login: ");
760: for (p = nbuf; (ch = getchar()) != '\n'; ) {
761: if (ch == EOF) {
762: badlogin(username);
1.36 millert 763: quickexit(0);
1.1 deraadt 764: }
765: if (p < nbuf + (NBUFSIZ - 1))
766: *p++ = ch;
767: }
1.24 art 768: if (p > nbuf) {
1.1 deraadt 769: if (nbuf[0] == '-')
770: (void)fprintf(stderr,
771: "login names may not start with '-'.\n");
772: else {
773: *p = '\0';
774: username = nbuf;
775: break;
776: }
1.24 art 777: }
1.1 deraadt 778: }
779: }
780:
781: int
1.47 deraadt 782: rootterm(char *ttyn)
1.1 deraadt 783: {
784: struct ttyent *t;
785:
1.36 millert 786: /* XXX - stash output of getttynam() elsewhere */
1.1 deraadt 787: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
788: }
789:
790: void
1.47 deraadt 791: motd(void)
1.1 deraadt 792: {
1.47 deraadt 793: char tbuf[8192], *motd;
1.1 deraadt 794: int fd, nchars;
1.48 millert 795: struct sigaction sa, osa;
1.30 millert 796:
797: motd = login_getcapstr(lc, "welcome", _PATH_MOTDFILE, _PATH_MOTDFILE);
1.1 deraadt 798:
1.30 millert 799: if ((fd = open(motd, O_RDONLY, 0)) < 0)
1.1 deraadt 800: return;
1.48 millert 801:
802: memset(&sa, 0, sizeof(sa));
803: sa.sa_handler = sigint;
804: sigemptyset(&sa.sa_mask);
805: sa.sa_flags = 0; /* don't set SA_RESTART */
806: (void)sigaction(SIGINT, &sa, &osa);
807:
808: /* read and spew motd until EOF, error, or SIGINT */
809: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 &&
810: write(STDOUT_FILENO, tbuf, nchars) == nchars)
811: ;
812:
813: (void)sigaction(SIGINT, &osa, NULL);
1.1 deraadt 814: (void)close(fd);
815: }
816:
817: /* ARGSUSED */
818: void
1.47 deraadt 819: sigint(int signo)
1.1 deraadt 820: {
1.52 otto 821: return; /* just interrupt syscall */
1.1 deraadt 822: }
823:
824: /* ARGSUSED */
825: void
1.47 deraadt 826: timedout(int signo)
1.1 deraadt 827: {
1.47 deraadt 828: char warn[1024];
829:
830: snprintf(warn, sizeof warn,
831: "Login timed out after %d seconds\n", timeout);
832: write(STDERR_FILENO, warn, strlen(warn));
1.37 millert 833: if (username)
834: badlogin(username);
1.47 deraadt 835: _exit(0);
1.1 deraadt 836: }
837:
838: void
1.47 deraadt 839: dolastlog(int quiet)
1.1 deraadt 840: {
841: struct lastlog ll;
1.67 guenther 842: off_t pos;
1.1 deraadt 843: int fd;
844:
845: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1.67 guenther 846: pos = (off_t)pwd->pw_uid * sizeof(ll);
1.1 deraadt 847: if (!quiet) {
1.67 guenther 848: if (pread(fd, &ll, sizeof(ll), pos) == sizeof(ll) &&
1.1 deraadt 849: ll.ll_time != 0) {
850: (void)printf("Last login: %.*s ",
851: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 852: (void)printf("on %.*s",
853: (int)sizeof(ll.ll_line),
854: ll.ll_line);
1.1 deraadt 855: if (*ll.ll_host != '\0')
1.14 millert 856: (void)printf(" from %.*s",
1.1 deraadt 857: (int)sizeof(ll.ll_host),
858: ll.ll_host);
1.14 millert 859: (void)putchar('\n');
1.1 deraadt 860: }
861: }
1.67 guenther 862: memset(&ll, 0, sizeof(ll));
1.1 deraadt 863: (void)time(&ll.ll_time);
864: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
865: if (hostname)
866: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
1.67 guenther 867: (void)pwrite(fd, &ll, sizeof(ll), pos);
1.1 deraadt 868: (void)close(fd);
869: }
870: }
871:
872: void
1.47 deraadt 873: badlogin(char *name)
1.1 deraadt 874: {
1.47 deraadt 875: struct syslog_data sdata = SYSLOG_DATA_INIT;
876:
1.1 deraadt 877: if (failures == 0)
878: return;
879: if (hostname) {
1.47 deraadt 880: syslog_r(LOG_NOTICE, &sdata,
881: "%d LOGIN FAILURE%s FROM %s%s%s",
1.14 millert 882: failures, failures > 1 ? "S" : "",
883: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.47 deraadt 884: syslog_r(LOG_AUTHPRIV|LOG_NOTICE, &sdata,
1.14 millert 885: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
886: failures, failures > 1 ? "S" : "",
887: rusername ? rusername : "", rusername ? "@" : "",
888: hostname, name);
1.1 deraadt 889: } else {
1.47 deraadt 890: syslog_r(LOG_NOTICE, &sdata,
891: "%d LOGIN FAILURE%s ON %s",
1.1 deraadt 892: failures, failures > 1 ? "S" : "", tty);
1.47 deraadt 893: syslog_r(LOG_AUTHPRIV|LOG_NOTICE, &sdata,
1.1 deraadt 894: "%d LOGIN FAILURE%s ON %s, %s",
895: failures, failures > 1 ? "S" : "", tty, name);
896: }
897: }
898:
899: #undef UNKNOWN
900: #define UNKNOWN "su"
901:
902: char *
1.47 deraadt 903: stypeof(char *ttyid)
1.1 deraadt 904: {
905: struct ttyent *t;
906:
1.30 millert 907: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type :
908: login_getcapstr(lc, "term", UNKNOWN, UNKNOWN));
1.1 deraadt 909: }
910:
911: void
1.47 deraadt 912: sleepexit(int eval)
1.1 deraadt 913: {
1.36 millert 914: auth_close(as);
1.1 deraadt 915: (void)sleep(5);
916: exit(eval);
1.11 millert 917: }
918:
919: void
1.47 deraadt 920: quickexit(int eval)
1.36 millert 921: {
922: if (as)
923: auth_close(as);
924: exit(eval);
925: }
926:
927:
928: void
1.47 deraadt 929: sighup(int signum)
1.11 millert 930: {
931: if (username)
932: badlogin(username);
1.47 deraadt 933: _exit(0);
1.1 deraadt 934: }
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