Annotation of src/usr.bin/login/login.c, Revision 1.40
1.40 ! millert 1: /* $OpenBSD: login.c,v 1.39 2001/06/25 16:18:37 millert 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
1.36 millert 36: /*-
37: * Copyright (c) 1995 Berkeley Software Design, Inc. All rights reserved.
38: *
39: * Redistribution and use in source and binary forms, with or without
40: * modification, are permitted provided that the following conditions
41: * are met:
42: * 1. Redistributions of source code must retain the above copyright
43: * notice, this list of conditions and the following disclaimer.
44: * 2. Redistributions in binary form must reproduce the above copyright
45: * notice, this list of conditions and the following disclaimer in the
46: * documentation and/or other materials provided with the distribution.
47: * 3. All advertising materials mentioning features or use of this software
48: * must display the following acknowledgement:
49: * This product includes software developed by Berkeley Software Design,
50: * Inc.
51: * 4. The name of Berkeley Software Design, Inc. may not be used to endorse
52: * or promote products derived from this software without specific prior
53: * written permission.
54: *
55: * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
56: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58: * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
59: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65: * SUCH DAMAGE.
66: *
67: * BSDI $From: login.c,v 2.28 1999/09/08 22:35:36 prb Exp $
68: */
1.1 deraadt 69:
70: #ifndef lint
71: static char copyright[] =
72: "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
73: The Regents of the University of California. All rights reserved.\n";
74: #endif /* not lint */
75:
76: #ifndef lint
77: #if 0
78: static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
79: #endif
1.40 ! millert 80: static char rcsid[] = "$OpenBSD: login.c,v 1.39 2001/06/25 16:18:37 millert Exp $";
1.1 deraadt 81: #endif /* not lint */
82:
83: /*
84: * login [ name ]
85: * login -h hostname (for telnetd, etc.)
86: * login -f name (for pre-authenticated login: datakit, xterm, etc.)
87: */
88:
89: #include <sys/param.h>
1.36 millert 90: #include <sys/socket.h>
1.1 deraadt 91: #include <sys/stat.h>
92: #include <sys/time.h>
93: #include <sys/resource.h>
1.11 millert 94: #include <sys/wait.h>
1.1 deraadt 95:
96: #include <err.h>
97: #include <errno.h>
1.27 millert 98: #include <fcntl.h>
1.1 deraadt 99: #include <grp.h>
1.30 millert 100: #include <login_cap.h>
1.36 millert 101: #include <netdb.h>
1.1 deraadt 102: #include <pwd.h>
103: #include <setjmp.h>
104: #include <signal.h>
1.36 millert 105: #include <stdarg.h>
1.1 deraadt 106: #include <stdio.h>
107: #include <stdlib.h>
108: #include <string.h>
109: #include <syslog.h>
110: #include <ttyent.h>
111: #include <tzfile.h>
112: #include <unistd.h>
113: #include <utmp.h>
1.3 deraadt 114: #include <util.h>
1.36 millert 115: #include <bsd_auth.h>
116:
117: #ifdef KERBEROS
118: #include <kerberosIV/kafs.h>
119: #endif
1.1 deraadt 120:
121: #include "pathnames.h"
122:
123: void badlogin __P((char *));
124: void dolastlog __P((int));
125: void getloginname __P((void));
126: void motd __P((void));
1.36 millert 127: void quickexit __P((int));
1.1 deraadt 128: int rootterm __P((char *));
129: void sigint __P((int));
1.11 millert 130: void sighup __P((int));
1.1 deraadt 131: void sleepexit __P((int));
132: char *stypeof __P((char *));
133: void timedout __P((int));
134:
1.13 millert 135: extern int check_failedlogin __P((uid_t));
1.14 millert 136: extern void log_failedlogin __P((uid_t, char *, char *, char *));
1.1 deraadt 137:
138: #define TTYGRPNAME "tty" /* name of group to own ttys */
139:
140: /*
1.37 millert 141: * This bounds the time given to login; may be overridden by /etc/login.conf.
1.1 deraadt 142: */
1.30 millert 143: u_int timeout = 300;
1.1 deraadt 144:
1.36 millert 145: struct passwd *pwd;
1.30 millert 146: login_cap_t *lc = NULL;
1.36 millert 147: auth_session_t *as = NULL;
1.30 millert 148: int failures;
1.36 millert 149: int needbanner = 1;
1.30 millert 150: char term[64], *hostname, *tty;
1.36 millert 151: char *style;
1.30 millert 152: char *username = NULL, *rusername = NULL;
1.1 deraadt 153:
154: int
155: main(argc, argv)
156: int argc;
157: char *argv[];
158: {
159: extern char **environ;
1.36 millert 160: struct addrinfo *ai, hints;
1.1 deraadt 161: struct group *gr;
1.36 millert 162: struct rlimit cds, scds;
1.1 deraadt 163: struct stat st;
164: struct utmp utmp;
1.36 millert 165: quad_t expire, warning;
1.1 deraadt 166: uid_t uid;
1.36 millert 167: int ask, ch, cnt, fflag, pflag, quietlog, rootlogin, lastchance;
1.37 millert 168: int error, homeless, needto, authok, tries, backoff;
1.36 millert 169: char *domain, *p, *ttyn, *shell, *fullname, *instance;
170: char *lipaddr, *script, *ripaddr, *style, *type, *fqdn, *copyright;
1.1 deraadt 171: char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
172: char localhost[MAXHOSTNAMELEN];
173:
174: (void)signal(SIGALRM, timedout);
1.36 millert 175: if (argc > 1) {
176: needto = 0;
177: (void)alarm(timeout);
178: } else
179: needto = 1;
1.1 deraadt 180: (void)signal(SIGQUIT, SIG_IGN);
181: (void)signal(SIGINT, SIG_IGN);
1.36 millert 182: (void)signal(SIGHUP, SIG_IGN);
1.1 deraadt 183: (void)setpriority(PRIO_PROCESS, 0, 0);
184:
185: openlog("login", LOG_ODELAY, LOG_AUTH);
186:
1.37 millert 187: fqdn = lipaddr = ripaddr = fullname = type = NULL;
188: authok = 0;
189: tries = 10;
190: backoff = 3;
1.36 millert 191:
192: /*
193: * Since login deals with sensitive information, turn off coredumps.
194: */
195: if (getrlimit(RLIMIT_CORE, &scds) < 0) {
196: syslog(LOG_ERR, "couldn't get core dump size: %m");
197: scds.rlim_cur = scds.rlim_max = QUAD_MIN;
198: }
199: cds.rlim_cur = cds.rlim_max = 0;
200: if (setrlimit(RLIMIT_CORE, &cds) < 0) {
201: syslog(LOG_ERR, "couldn't set core dump size to 0: %m");
202: scds.rlim_cur = scds.rlim_max = QUAD_MIN;
203: }
204:
1.1 deraadt 205: /*
206: * -p is used by getty to tell login not to destroy the environment
207: * -f is used to skip a second login authentication
208: * -h is used by other servers to pass the name of the remote
209: * host to login so that it may be placed in utmp and wtmp
210: */
211: domain = NULL;
212: if (gethostname(localhost, sizeof(localhost)) < 0)
213: syslog(LOG_ERR, "couldn't get local hostname: %m");
214: else
215: domain = strchr(localhost, '.');
1.21 deraadt 216: if (domain) {
217: domain++;
218: if (*domain && strchr(domain, '.') == NULL)
219: domain = localhost;
220: }
1.1 deraadt 221:
1.36 millert 222: if ((as = auth_open()) == NULL) {
1.39 millert 223: syslog(LOG_ERR, "auth_open: %m");
224: err(1, "unable to initialize BSD authentication");
1.36 millert 225: }
1.39 millert 226: auth_setoption(as, "login", "yes");
1.36 millert 227:
228: fflag = pflag = 0;
1.1 deraadt 229: uid = getuid();
1.36 millert 230: while ((ch = getopt(argc, argv, "fh:pu:L:R:")) != -1)
1.1 deraadt 231: switch (ch) {
232: case 'f':
233: fflag = 1;
234: break;
235: case 'h':
1.36 millert 236: if (uid) {
237: warn("-h option: %s", strerror(EPERM));
238: quickexit(1);
239: }
240: if ((fqdn = strdup(optarg)) == NULL) {
241: warn(NULL);
242: quickexit(1);
243: }
244: auth_setoption(as, "fqdn", fqdn);
1.1 deraadt 245: if (domain && (p = strchr(optarg, '.')) &&
1.21 deraadt 246: strcasecmp(p+1, domain) == 0)
1.1 deraadt 247: *p = 0;
248: hostname = optarg;
1.36 millert 249: auth_setoption(as, "hostname", hostname);
250: break;
251: case 'L':
252: if (uid) {
253: warnx("-L option: %s", strerror(EPERM));
254: quickexit(1);
255: }
256: if (lipaddr) {
257: warnx("duplicate -L option");
258: quickexit(1);
259: }
260: lipaddr = optarg;
261: memset(&hints, 0, sizeof(hints));
262: hints.ai_family = PF_UNSPEC;
263: hints.ai_flags = AI_CANONNAME;
264: error = getaddrinfo(lipaddr, NULL, &hints, &ai);
265: if (!error) {
266: strlcpy(localhost, ai->ai_canonname,
267: sizeof(localhost));
268: freeaddrinfo(ai);
269: } else
270: strlcpy(localhost, lipaddr, sizeof(localhost));
271: auth_setoption(as, "local_addr", lipaddr);
1.1 deraadt 272: break;
273: case 'p':
274: pflag = 1;
275: break;
1.36 millert 276: case 'R':
277: if (uid) {
278: warnx("-R option: %s", strerror(EPERM));
279: quickexit(1);
280: }
281: if (ripaddr) {
282: warnx("duplicate -R option");
283: quickexit(1);
284: }
285: ripaddr = optarg;
286: auth_setoption(as, "remote_addr", ripaddr);
287: break;
1.14 millert 288: case 'u':
1.36 millert 289: if (uid) {
290: warnx("-u option: %s", strerror(EPERM));
291: quickexit(1);
292: }
1.14 millert 293: rusername = optarg;
294: break;
1.1 deraadt 295: default:
296: if (!uid)
297: syslog(LOG_ERR, "invalid flag %c", ch);
298: (void)fprintf(stderr,
1.36 millert 299: "usage: login [-fp] [-h hostname] [-L lipaddr] [-R ripaddr] [username]\n");
300: quickexit(1);
1.1 deraadt 301: }
302: argc -= optind;
303: argv += optind;
304:
305: if (*argv) {
306: username = *argv;
307: ask = 0;
308: } else
309: ask = 1;
310:
311: for (cnt = getdtablesize(); cnt > 2; cnt--)
312: (void)close(cnt);
313:
314: ttyn = ttyname(STDIN_FILENO);
315: if (ttyn == NULL || *ttyn == '\0') {
316: (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
317: ttyn = tname;
318: }
1.12 millert 319: if ((tty = strrchr(ttyn, '/')))
1.1 deraadt 320: ++tty;
321: else
322: tty = ttyn;
323:
1.36 millert 324: #ifdef notyet
325: /* XXX - we don't (yet) support per-tty auth stuff */
326: /* BSDi uses a ttys.conf file but we could just overload /etc/ttys */
327: /*
328: * Classify the attempt.
329: * By default we use the value in the ttys file.
330: * If there is a classify script we run that as
331: *
332: * classify [-f] [username]
333: */
334: if (type = getttyauth(tty))
335: auth_setoption(as, "auth_type", type);
336: #endif
337:
338: /* get the default login class */
339: if ((lc = login_getclass(0)) == NULL) { /* get the default class */
340: warnx("Failure to retrieve default class");
341: quickexit(1);
342: }
1.37 millert 343: timeout = (u_int)login_getcapnum(lc, "login-timeout", 300, 300);
1.36 millert 344: if ((script = login_getcapstr(lc, "classify", NULL, NULL)) != NULL) {
345: unsetenv("AUTH_TYPE");
346: unsetenv("REMOTE_NAME");
347: if (script[0] != '/') {
348: syslog(LOG_ERR, "Invalid classify script: %s", script);
349: warnx("Classification failure");
350: quickexit(1);
351: }
352: shell = strrchr(script, '/') + 1;
353: auth_setstate(as, AUTH_OKAY);
354: auth_call(as, script, shell,
355: fflag ? "-f" : username, fflag ? username : 0, 0);
356: if (!(auth_getstate(as) & AUTH_ALLOW))
357: quickexit(1);
358: auth_setenv(as);
359: if ((p = getenv("AUTH_TYPE")) != NULL &&
360: strncmp(p, "auth-", 5) == 0)
361: type = p;
362: if ((p = getenv("REMOTE_NAME")) != NULL)
363: hostname = p;
364: /*
365: * we may have changed some values, reset them
366: */
367: auth_clroptions(as);
368: if (type)
369: auth_setoption(as, "auth_type", type);
370: if (fqdn)
371: auth_setoption(as, "fqdn", fqdn);
372: if (hostname)
373: auth_setoption(as, "hostname", hostname);
374: if (lipaddr)
375: auth_setoption(as, "local_addr", lipaddr);
376: if (ripaddr)
377: auth_setoption(as, "remote_addr", ripaddr);
378: }
379:
380: /*
381: * Request the things like the approval script print things
382: * to stdout (in particular, the nologins files)
383: */
384: auth_setitem(as, AUTHV_INTERACTIVE, "True");
385:
1.1 deraadt 386: for (cnt = 0;; ask = 1) {
1.36 millert 387: /*
388: * Clean up our current authentication session.
389: * Options are not cleared so we need to clear any
390: * we might set below.
391: */
392: auth_clean(as);
393: auth_clroption(as, "style");
394: auth_clroption(as, "lastchance");
395:
396: lastchance = 0;
397:
1.1 deraadt 398: if (ask) {
399: fflag = 0;
400: getloginname();
401: }
1.36 millert 402: if (needto) {
403: needto = 0;
404: alarm(timeout);
405: }
406: if ((style = strchr(username, ':')) != NULL)
407: *style++ = '\0';
408: if (fullname)
409: free(fullname);
410: if (auth_setitem(as, AUTHV_NAME, username) < 0 ||
411: (fullname = strdup(username)) == NULL) {
412: syslog(LOG_ERR, "%m");
413: warn(NULL);
414: quickexit(1);
415: }
1.1 deraadt 416: rootlogin = 0;
1.40 ! millert 417: if ((instance = strpbrk(username, "./")) != NULL) {
! 418: if (strncmp(instance + 1, "root", 4) == 0)
1.1 deraadt 419: rootlogin = 1;
420: *instance++ = '\0';
421: } else
422: instance = "";
1.36 millert 423:
1.1 deraadt 424: if (strlen(username) > UT_NAMESIZE)
425: username[UT_NAMESIZE] = '\0';
426:
427: /*
428: * Note if trying multiple user names; log failures for
429: * previous user name, but don't bother logging one failure
430: * for nonexistent name (mistyped username).
431: */
432: if (failures && strcmp(tbuf, username)) {
433: if (failures > (pwd ? 0 : 1))
434: badlogin(tbuf);
435: failures = 0;
436: }
1.36 millert 437: (void)strlcpy(tbuf, username, sizeof(tbuf));
1.1 deraadt 438:
1.36 millert 439: if ((pwd = getpwnam(username)) != NULL &&
440: auth_setpwd(as, pwd) < 0) {
441: syslog(LOG_ERR, "%m");
442: warn(NULL);
443: quickexit(1);
444: }
1.1 deraadt 445:
1.36 millert 446: lc = login_getclass(pwd ? pwd->pw_class : NULL);
447: if (!lc)
448: goto failed;
1.1 deraadt 449:
1.36 millert 450: style = login_getstyle(lc, style, type);
451: if (!style)
452: goto failed;
1.1 deraadt 453:
1.36 millert 454: /*
1.37 millert 455: * We allow "login-tries" attempts to login but start
456: * slowing down after "login-backoff" attempts.
457: */
458: tries = (int)login_getcapnum(lc, "login-tries", 10, 10);
459: backoff = (int)login_getcapnum(lc, "login-backoff", 3, 3);
460:
461: /*
1.36 millert 462: * Turn off the fflag if we have an an invalid user
463: * or we are not root and we are trying to change uids.
464: */
465: if (!pwd || (uid && uid != pwd->pw_uid))
466: fflag = 0;
1.1 deraadt 467:
1.36 millert 468: if (pwd && pwd->pw_uid == 0)
469: rootlogin = 1;
1.25 millert 470:
1.36 millert 471: /*
472: * If we do not have the force flag authenticate the user
473: */
474: if (fflag)
475: authok = AUTH_SECURE;
476: else {
477: lastchance =
478: login_getcaptime(lc, "password-dead", 0, 0) != 0;
479: if (lastchance)
480: auth_setoption(as, "lastchance", "yes");
481: /*
482: * Once we start asking for a password
483: * we want to log a failure on a hup.
484: */
485: signal(SIGHUP, sighup);
486: auth_verify(as, style, NULL, lc->lc_class, NULL);
487: authok = auth_getstate(as);
488: /*
489: * If their password expired and it has not been
490: * too long since then, give the user one last
491: * chance to change their password
492: */
493: if ((authok & AUTH_PWEXPIRED) && lastchance) {
494: authok = AUTH_OKAY;
495: } else
496: lastchance = 0;
497: if ((authok & AUTH_ALLOW) == 0)
498: goto failed;
499: if (auth_setoption(as, "style", style) < 0) {
500: syslog(LOG_ERR, "%m");
501: warn(NULL);
502: quickexit(1);
1.25 millert 503: }
1.1 deraadt 504: }
1.36 millert 505: /*
506: * explicitly reject users without password file entries
507: */
508: if (pwd == 0)
509: goto failed;
1.1 deraadt 510:
1.36 millert 511: authok &= AUTH_SECURE;
1.1 deraadt 512:
513: /*
1.36 millert 514: * If trying to log in as root on an insecure terminal,
515: * refuse the login attempt unless the authentication
516: * style explicitly says a root login is okay.
1.1 deraadt 517: */
1.36 millert 518: if (authok == 0 && pwd && rootlogin && !rootterm(tty))
519: goto failed;
1.29 millert 520:
1.36 millert 521: if (fflag) {
522: type = 0;
523: style = "forced";
524: }
525: break;
526:
527: failed:
528: if (authok & AUTH_SILENT)
529: quickexit(0);
1.29 millert 530: if (rootlogin && !rootterm(tty)) {
1.36 millert 531: warnx("%s login refused on this terminal.",
532: fullname);
1.1 deraadt 533: if (hostname)
534: syslog(LOG_NOTICE,
1.14 millert 535: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
1.36 millert 536: fullname, rusername ? rusername : "",
1.14 millert 537: rusername ? "@" : "", hostname, tty);
1.1 deraadt 538: else
539: syslog(LOG_NOTICE,
540: "LOGIN %s REFUSED ON TTY %s",
1.36 millert 541: fullname, tty);
542: } else {
543: if (!as || (p = auth_getvalue(as, "errormsg")) == NULL)
544: p = "Login incorrect";
545: (void)printf("%s\n", p);
546: }
1.1 deraadt 547: failures++;
1.13 millert 548: if (pwd)
1.14 millert 549: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.37 millert 550: /*
551: * By default, we allow 10 tries, but after 3 we start
552: * backing off to slow down password guessers.
553: */
554: if (++cnt > backoff) {
555: if (cnt >= tries) {
1.1 deraadt 556: badlogin(username);
557: sleepexit(1);
558: }
1.37 millert 559: sleep((u_int)((cnt - backoff) * tries / 2));
1.1 deraadt 560: }
561: }
562:
563: /* committed to login -- turn off timeout */
1.36 millert 564: (void)alarm(0);
1.1 deraadt 565:
566: endpwent();
567:
1.30 millert 568: shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
569: if (*shell == '\0')
570: shell = _PATH_BSHELL;
571: else if (strlen(shell) >= MAXPATHLEN) {
572: syslog(LOG_ERR, "shell path too long: %s", shell);
573: warnx("invalid shell");
1.36 millert 574: quickexit(1);
1.24 art 575: }
1.1 deraadt 576:
577: /* Destroy environment unless user has requested its preservation. */
1.24 art 578: if (!pflag) {
1.22 deraadt 579: if ((environ = calloc(1, sizeof (char *))) == NULL)
580: err(1, "calloc");
1.24 art 581: } else {
1.9 millert 582: char **cpp, **cpp2;
583:
584: for (cpp2 = cpp = environ; *cpp; cpp++) {
585: if (strncmp(*cpp, "LD_", 3) &&
1.29 millert 586: strncmp(*cpp, "ENV=", 4) &&
587: strncmp(*cpp, "BASH_ENV=", 9) &&
1.9 millert 588: strncmp(*cpp, "IFS=", 4))
589: *cpp2++ = *cpp;
590: }
591: *cpp2 = 0;
592: }
1.30 millert 593: /* Note: setusercontext(3) will set PATH */
1.34 deraadt 594: if (setenv("HOME", pwd->pw_dir, 1) == -1 ||
595: setenv("SHELL", shell, 1) == -1) {
596: warn("unable to setenv()");
1.36 millert 597: quickexit(1);
1.34 deraadt 598: }
1.1 deraadt 599: if (term[0] == '\0')
1.29 millert 600: (void)strlcpy(term, stypeof(tty), sizeof(term));
1.34 deraadt 601: if (setenv("TERM", term, 0) == -1 ||
602: setenv("LOGNAME", pwd->pw_name, 1) == -1 ||
603: setenv("USER", pwd->pw_name, 1) == -1) {
604: warn("unable to setenv()");
1.36 millert 605: quickexit(1);
1.34 deraadt 606: }
607: if (hostname) {
608: if (setenv("REMOTEHOST", hostname, 1) == -1) {
609: warn("unable to setenv()");
1.36 millert 610: quickexit(1);
1.34 deraadt 611: }
612: }
613: if (rusername) {
614: if (setenv("REMOTEUSER", rusername, 1) == -1) {
615: warn("unable to setenv()");
1.36 millert 616: quickexit(1);
1.34 deraadt 617: }
618: }
1.36 millert 619:
620: if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH)) {
621: warn("unable to set user context");
622: quickexit(1);
623: }
624: auth_setenv(as);
625:
626: /* if user not super-user, check for disabled logins */
627: if (!rootlogin)
628: auth_checknologin(lc);
629:
630: setegid(pwd->pw_gid);
631: seteuid(pwd->pw_uid);
632:
633: homeless = chdir(pwd->pw_dir);
634: if (homeless) {
635: if (login_getcapbool(lc, "requirehome", 0)) {
636: (void)printf("No home directory %s!\n", pwd->pw_dir);
637: quickexit(1);
1.34 deraadt 638: }
1.36 millert 639: if (chdir("/"))
640: quickexit(0);
1.34 deraadt 641: }
1.36 millert 642:
643: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
644: login_getcapbool(lc, "hushlogin", 0) ||
645: (access(_PATH_HUSHLOGIN, F_OK) == 0));
646:
647: seteuid(0);
648: setegid(0); /* XXX use a saved gid instead? */
649:
650: if ((p = auth_getvalue(as, "warnmsg")) != NULL)
651: (void)printf("WARNING: %s\n\n", p);
652:
653: expire = auth_check_expire(as);
654: if (expire < 0) {
655: (void)printf("Sorry -- your account has expired.\n");
656: quickexit(1);
657: } else if (expire > 0 && !quietlog) {
658: warning = login_getcaptime(lc, "expire-warn",
659: 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY);
660: if (expire < warning)
661: (void)printf("Warning: your account expires on %s",
662: ctime(&pwd->pw_expire));
1.34 deraadt 663: }
1.36 millert 664:
665: /* Nothing else left to fail -- really log in. */
666: (void)signal(SIGHUP, SIG_DFL);
667: memset(&utmp, 0, sizeof(utmp));
668: (void)time(&utmp.ut_time);
669: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
670: if (hostname)
671: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
672: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
673: login(&utmp);
674:
675: if (!quietlog)
676: (void)check_failedlogin(pwd->pw_uid);
677: dolastlog(quietlog);
678:
679: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
680:
681: (void)chown(ttyn, pwd->pw_uid,
682: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
683:
1.1 deraadt 684: /* If fflag is on, assume caller/authenticator has logged root login. */
1.24 art 685: if (rootlogin && fflag == 0) {
1.1 deraadt 686: if (hostname)
1.14 millert 687: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
688: username, tty, rusername ? rusername : "",
689: rusername ? "@" : "", hostname);
1.1 deraadt 690: else
691: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
1.24 art 692: }
1.1 deraadt 693:
694: if (!quietlog) {
1.2 deraadt 695: #if 0
1.1 deraadt 696: (void)printf("%s\n\t%s %s\n\n",
697: "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
698: "The Regents of the University of California. ",
699: "All rights reserved.");
1.2 deraadt 700: #endif
1.36 millert 701: if ((copyright =
702: login_getcapstr(lc, "copyright", NULL, NULL)) != NULL)
703: auth_cat(copyright);
1.1 deraadt 704: motd();
705: (void)snprintf(tbuf,
706: sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
707: if (stat(tbuf, &st) == 0 && st.st_size != 0)
708: (void)printf("You have %smail.\n",
709: (st.st_mtime > st.st_atime) ? "new " : "");
710: }
711:
712: (void)signal(SIGALRM, SIG_DFL);
713: (void)signal(SIGQUIT, SIG_DFL);
1.36 millert 714: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 715: (void)signal(SIGINT, SIG_DFL);
716: (void)signal(SIGTSTP, SIG_IGN);
717:
718: tbuf[0] = '-';
1.30 millert 719: (void)strlcpy(tbuf + 1, (p = strrchr(shell, '/')) ?
1.36 millert 720: p + 1 : shell, sizeof(tbuf) - 1);
721:
722: if ((scds.rlim_cur != QUAD_MIN || scds.rlim_max != QUAD_MIN) &&
723: setrlimit(RLIMIT_CORE, &scds) < 0)
724: syslog(LOG_ERR, "couldn't reset core dump size: %m");
725:
726: if (lastchance)
727: (void)printf("WARNING: Your password has expired. You must change your password, now!\n");
1.1 deraadt 728:
1.38 millert 729: if (setusercontext(lc, pwd, rootlogin ? 0 : pwd->pw_uid,
1.36 millert 730: LOGIN_SETALL & ~LOGIN_SETPATH) < 0) {
1.30 millert 731: warn("unable to set user context");
1.36 millert 732: quickexit(1);
733: }
734:
735: if (homeless) {
736: (void)printf("No home directory %s!\n", pwd->pw_dir);
737: (void)printf("Logging in with home = \"/\".\n");
738: (void)setenv("HOME", "/", 1);
1.15 tholo 739: }
1.30 millert 740:
1.36 millert 741: if (auth_approval(as, lc, NULL, "login") == 0) {
742: if (auth_getstate(as) & AUTH_EXPIRED)
743: (void)printf("Sorry -- your account has expired.\n");
744: else
745: (void)printf("approval failure\n");
746: quickexit(1);
747: }
748:
749: /*
750: * The last thing we do is discard all of the open file descriptors.
751: * Last because the C library may have some open.
752: *
753: * XXX
754: * Assume that stdin, stdout and stderr are 0, 1 and 2, and that
755: * STDERR_FILENO is 2.
756: */
757: for (cnt = getdtablesize(); cnt > STDERR_FILENO; cnt--)
758: (void)close(cnt);
759:
760: /*
761: * Close the authentication session, make sure it is marked
762: * as okay so no files are removed.
763: */
764: auth_setstate(as, AUTH_OKAY);
765: auth_close(as);
766:
1.24 art 767: #ifdef KERBEROS
1.36 millert 768: kgettokens(pwd->pw_dir);
1.24 art 769: #endif
1.1 deraadt 770:
1.30 millert 771: execlp(shell, tbuf, 0);
772: err(1, "%s", shell);
1.1 deraadt 773: }
774:
775: /*
1.36 millert 776: * Allow for a '.' and 16 characters for any instance as well as
777: * space for a ':' and 16 charcters defining the authentication type.
1.1 deraadt 778: */
1.36 millert 779: #define NBUFSIZ (UT_NAMESIZE + 1 + 16 + 1 + 16)
1.1 deraadt 780:
781: void
782: getloginname()
783: {
784: int ch;
785: char *p;
786: static char nbuf[NBUFSIZ];
787:
788: for (;;) {
789: (void)printf("login: ");
790: for (p = nbuf; (ch = getchar()) != '\n'; ) {
791: if (ch == EOF) {
792: badlogin(username);
1.36 millert 793: quickexit(0);
1.1 deraadt 794: }
795: if (p < nbuf + (NBUFSIZ - 1))
796: *p++ = ch;
797: }
1.24 art 798: if (p > nbuf) {
1.1 deraadt 799: if (nbuf[0] == '-')
800: (void)fprintf(stderr,
801: "login names may not start with '-'.\n");
802: else {
803: *p = '\0';
804: username = nbuf;
805: break;
806: }
1.24 art 807: }
1.1 deraadt 808: }
809: }
810:
811: int
812: rootterm(ttyn)
813: char *ttyn;
814: {
815: struct ttyent *t;
816:
1.36 millert 817: /* XXX - stash output of getttynam() elsewhere */
1.1 deraadt 818: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
819: }
820:
821: jmp_buf motdinterrupt;
822:
823: void
824: motd()
825: {
826: int fd, nchars;
827: sig_t oldint;
828: char tbuf[8192];
1.30 millert 829: char *motd;
830:
831: motd = login_getcapstr(lc, "welcome", _PATH_MOTDFILE, _PATH_MOTDFILE);
1.1 deraadt 832:
1.30 millert 833: if ((fd = open(motd, O_RDONLY, 0)) < 0)
1.1 deraadt 834: return;
835: oldint = signal(SIGINT, sigint);
836: if (setjmp(motdinterrupt) == 0)
837: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
838: (void)write(fileno(stdout), tbuf, nchars);
839: (void)signal(SIGINT, oldint);
840: (void)close(fd);
841: }
842:
843: /* ARGSUSED */
844: void
845: sigint(signo)
846: int signo;
847: {
848: longjmp(motdinterrupt, 1);
849: }
850:
851: /* ARGSUSED */
852: void
853: timedout(signo)
854: int signo;
855: {
856: (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
1.37 millert 857: if (username)
858: badlogin(username);
1.1 deraadt 859: exit(0);
860: }
861:
862: void
863: dolastlog(quiet)
864: int quiet;
865: {
866: struct lastlog ll;
867: int fd;
868:
869: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1.26 millert 870: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
1.1 deraadt 871: if (!quiet) {
872: if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
873: ll.ll_time != 0) {
874: (void)printf("Last login: %.*s ",
875: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 876: (void)printf("on %.*s",
877: (int)sizeof(ll.ll_line),
878: ll.ll_line);
1.1 deraadt 879: if (*ll.ll_host != '\0')
1.14 millert 880: (void)printf(" from %.*s",
1.1 deraadt 881: (int)sizeof(ll.ll_host),
882: ll.ll_host);
1.14 millert 883: (void)putchar('\n');
1.1 deraadt 884: }
1.26 millert 885: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll),
886: SEEK_SET);
1.1 deraadt 887: }
888: memset((void *)&ll, 0, sizeof(ll));
889: (void)time(&ll.ll_time);
890: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
891: if (hostname)
892: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
893: (void)write(fd, (char *)&ll, sizeof(ll));
894: (void)close(fd);
895: }
896: }
897:
898: void
899: badlogin(name)
900: char *name;
901: {
902: if (failures == 0)
903: return;
904: if (hostname) {
1.14 millert 905: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s%s%s",
906: failures, failures > 1 ? "S" : "",
907: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.1 deraadt 908: syslog(LOG_AUTHPRIV|LOG_NOTICE,
1.14 millert 909: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
910: failures, failures > 1 ? "S" : "",
911: rusername ? rusername : "", rusername ? "@" : "",
912: hostname, name);
1.1 deraadt 913: } else {
914: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
915: failures, failures > 1 ? "S" : "", tty);
916: syslog(LOG_AUTHPRIV|LOG_NOTICE,
917: "%d LOGIN FAILURE%s ON %s, %s",
918: failures, failures > 1 ? "S" : "", tty, name);
919: }
920: }
921:
922: #undef UNKNOWN
923: #define UNKNOWN "su"
924:
925: char *
926: stypeof(ttyid)
927: char *ttyid;
928: {
929: struct ttyent *t;
930:
1.30 millert 931: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type :
932: login_getcapstr(lc, "term", UNKNOWN, UNKNOWN));
1.1 deraadt 933: }
934:
935: void
936: sleepexit(eval)
937: int eval;
938: {
1.36 millert 939: auth_close(as);
1.1 deraadt 940: (void)sleep(5);
941: exit(eval);
1.11 millert 942: }
943:
944: void
1.36 millert 945: quickexit(eval)
946: int eval;
947: {
948: if (as)
949: auth_close(as);
950: exit(eval);
951: }
952:
953:
954: void
1.11 millert 955: sighup(signum)
956: int signum;
957: {
958: if (username)
959: badlogin(username);
1.30 millert 960: exit(0);
1.1 deraadt 961: }
1.36 millert 962:
963: #ifdef KERBEROS
964: void
965: kgettokens(homedir)
966: char *homedir;
967: {
968:
969: /* buy AFS-tokens for homedir */
970: if (k_hasafs()) {
971: char cell[128];
972: k_setpag();
973: if (k_afs_cell_of_file(homedir,
974: cell, sizeof(cell)) == 0)
975: krb_afslog(cell, 0);
976: krb_afslog(0, 0);
977: }
978: }
979: #endif
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