Annotation of src/usr.bin/login/login.c, Revision 1.35
1.35 ! miod 1: /* $OpenBSD: login.c,v 1.34 2000/09/15 07:13:48 deraadt 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: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
46: #endif
1.35 ! miod 47: static char rcsid[] = "$OpenBSD: login.c,v 1.34 2000/09/15 07:13:48 deraadt Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: /*
51: * login [ name ]
52: * login -h hostname (for telnetd, etc.)
53: * login -f name (for pre-authenticated login: datakit, xterm, etc.)
54: */
55:
56: #include <sys/param.h>
57: #include <sys/stat.h>
58: #include <sys/time.h>
59: #include <sys/resource.h>
1.11 millert 60: #include <sys/wait.h>
1.1 deraadt 61:
62: #include <err.h>
63: #include <errno.h>
1.27 millert 64: #include <fcntl.h>
1.1 deraadt 65: #include <grp.h>
1.30 millert 66: #include <login_cap.h>
1.1 deraadt 67: #include <pwd.h>
68: #include <setjmp.h>
69: #include <signal.h>
70: #include <stdio.h>
71: #include <stdlib.h>
72: #include <string.h>
73: #include <syslog.h>
74: #include <ttyent.h>
75: #include <tzfile.h>
76: #include <unistd.h>
77: #include <utmp.h>
1.3 deraadt 78: #include <util.h>
1.24 art 79: #include <skey.h>
1.1 deraadt 80:
81: #include "pathnames.h"
82:
83: void badlogin __P((char *));
84: void checknologin __P((void));
85: void dolastlog __P((int));
86: void getloginname __P((void));
87: void motd __P((void));
88: int rootterm __P((char *));
89: void sigint __P((int));
1.11 millert 90: void sighup __P((int));
1.1 deraadt 91: void sleepexit __P((int));
92: char *stypeof __P((char *));
93: void timedout __P((int));
94: int pwcheck __P((char *, char *, char *, char *));
95: #if defined(KERBEROS) || defined(KERBEROS5)
96: int klogin __P((struct passwd *, char *, char *, char *));
97: void kdestroy __P((void));
98: void dofork __P((void));
1.24 art 99: void kgettokens __P((char *));
1.1 deraadt 100: #endif
101:
1.13 millert 102: extern int check_failedlogin __P((uid_t));
1.14 millert 103: extern void log_failedlogin __P((uid_t, char *, char *, char *));
1.1 deraadt 104:
105: #define TTYGRPNAME "tty" /* name of group to own ttys */
106:
107: /*
108: * This bounds the time given to login. Not a define so it can
109: * be patched on machines where it's too small.
1.30 millert 110: * XXX - should be a login.conf variable!
1.1 deraadt 111: */
1.30 millert 112: u_int timeout = 300;
1.1 deraadt 113:
114: #if defined(KERBEROS) || defined(KERBEROS5)
1.30 millert 115: int notickets = 1;
116: char *instance;
117: char *krbtkfile_env;
118: int authok;
1.1 deraadt 119: #endif
120:
1.30 millert 121: struct passwd *pwd;
122: login_cap_t *lc = NULL;
123: int failures;
124: char term[64], *hostname, *tty;
125: char *username = NULL, *rusername = NULL;
1.1 deraadt 126:
127: int
128: main(argc, argv)
129: int argc;
130: char *argv[];
131: {
132: extern char **environ;
133: struct group *gr;
134: struct stat st;
135: struct timeval tp;
136: struct utmp utmp;
1.14 millert 137: int ask, ch, cnt, fflag, hflag, pflag, uflag, quietlog, rootlogin, rval;
1.1 deraadt 138: uid_t uid;
1.30 millert 139: char *domain, *p, *salt, *ttyn, *shell;
1.1 deraadt 140: char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
141: char localhost[MAXHOSTNAMELEN];
142:
143: (void)signal(SIGALRM, timedout);
144: (void)alarm(timeout);
145: (void)signal(SIGQUIT, SIG_IGN);
146: (void)signal(SIGINT, SIG_IGN);
1.11 millert 147: (void)signal(SIGHUP, sighup);
1.1 deraadt 148: (void)setpriority(PRIO_PROCESS, 0, 0);
149:
150: openlog("login", LOG_ODELAY, LOG_AUTH);
151:
152: /*
153: * -p is used by getty to tell login not to destroy the environment
154: * -f is used to skip a second login authentication
155: * -h is used by other servers to pass the name of the remote
156: * host to login so that it may be placed in utmp and wtmp
157: */
158: domain = NULL;
159: if (gethostname(localhost, sizeof(localhost)) < 0)
160: syslog(LOG_ERR, "couldn't get local hostname: %m");
161: else
162: domain = strchr(localhost, '.');
1.21 deraadt 163: if (domain) {
164: domain++;
165: if (*domain && strchr(domain, '.') == NULL)
166: domain = localhost;
167: }
1.1 deraadt 168:
169: fflag = hflag = pflag = 0;
170: uid = getuid();
1.16 millert 171: while ((ch = getopt(argc, argv, "fh:u:p")) != -1)
1.1 deraadt 172: switch (ch) {
173: case 'f':
174: fflag = 1;
175: break;
176: case 'h':
177: if (uid)
178: errx(1, "-h option: %s", strerror(EPERM));
179: hflag = 1;
180: if (domain && (p = strchr(optarg, '.')) &&
1.21 deraadt 181: strcasecmp(p+1, domain) == 0)
1.1 deraadt 182: *p = 0;
183: hostname = optarg;
184: break;
185: case 'p':
186: pflag = 1;
187: break;
1.14 millert 188: case 'u':
189: if (uid)
190: errx(1, "-u option: %s", strerror(EPERM));
191: uflag = 1;
192: rusername = optarg;
193: break;
1.1 deraadt 194: case '?':
195: default:
196: if (!uid)
197: syslog(LOG_ERR, "invalid flag %c", ch);
198: (void)fprintf(stderr,
199: "usage: login [-fp] [-h hostname] [username]\n");
200: exit(1);
201: }
202: argc -= optind;
203: argv += optind;
204:
205: if (*argv) {
206: username = *argv;
207: ask = 0;
208: } else
209: ask = 1;
210:
211: for (cnt = getdtablesize(); cnt > 2; cnt--)
212: (void)close(cnt);
213:
214: ttyn = ttyname(STDIN_FILENO);
215: if (ttyn == NULL || *ttyn == '\0') {
216: (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
217: ttyn = tname;
218: }
1.12 millert 219: if ((tty = strrchr(ttyn, '/')))
1.1 deraadt 220: ++tty;
221: else
222: tty = ttyn;
223:
224: for (cnt = 0;; ask = 1) {
225: #if defined(KERBEROS) || defined(KERBEROS5)
226: kdestroy();
1.35 ! miod 227: authok = 0;
1.1 deraadt 228: #endif
229: if (ask) {
230: fflag = 0;
231: getloginname();
232: }
233: rootlogin = 0;
1.18 flipk 234:
235: #if defined(KERBEROS) || defined(KERBEROS5)
236: /*
237: * Why should anyone with a root instance be able
238: * to be root here?
239: */
1.17 dm 240: instance = "";
1.18 flipk 241: #endif
1.1 deraadt 242: #ifdef KERBEROS
243: if ((instance = strchr(username, '.')) != NULL) {
244: if (strncmp(instance, ".root", 5) == 0)
245: rootlogin = 1;
246: *instance++ = '\0';
247: } else
248: instance = "";
249: #endif
250: #ifdef KERBEROS5
251: if ((instance = strchr(username, '/')) != NULL) {
252: if (strncmp(instance, "/root", 5) == 0)
253: rootlogin = 1;
254: *instance++ = '\0';
255: } else
256: instance = "";
257: #endif
258: if (strlen(username) > UT_NAMESIZE)
259: username[UT_NAMESIZE] = '\0';
260:
261: /*
262: * Note if trying multiple user names; log failures for
263: * previous user name, but don't bother logging one failure
264: * for nonexistent name (mistyped username).
265: */
266: if (failures && strcmp(tbuf, username)) {
267: if (failures > (pwd ? 0 : 1))
268: badlogin(tbuf);
269: failures = 0;
270: }
1.29 millert 271: (void)strlcpy(tbuf, username, sizeof tbuf);
1.1 deraadt 272:
1.12 millert 273: if ((pwd = getpwnam(username)))
1.1 deraadt 274: salt = pwd->pw_passwd;
275: else
276: salt = "xx";
1.30 millert 277: lc = login_getclass(pwd ? pwd->pw_class : LOGIN_DEFCLASS);
278: if (!lc)
279: err(1, "unable to get login class");
1.1 deraadt 280:
281: /*
1.29 millert 282: * If we have a valid account name, and it doesn't have a
1.1 deraadt 283: * password, or the -f option was specified and the caller
284: * is root or the caller isn't changing their uid, don't
285: * authenticate.
286: */
287: if (pwd) {
288: if (pwd->pw_uid == 0)
289: rootlogin = 1;
290:
291: if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
292: /* already authenticated */
293: break;
294: } else if (pwd->pw_passwd[0] == '\0') {
295: /* pretend password okay */
296: rval = 0;
1.35 ! miod 297: #if defined(KERBEROS) || defined(KERBEROS5)
! 298: authok = 1;
! 299: #endif
1.1 deraadt 300: goto ttycheck;
301: }
302: }
303:
304: fflag = 0;
305:
306: (void)setpriority(PRIO_PROCESS, 0, -4);
307:
308: p = getpass("Password:");
309:
310: if (pwd) {
311: #if defined(KERBEROS) || defined(KERBEROS5)
312: rval = klogin(pwd, instance, localhost, p);
313: if (rval != 0 && rootlogin && pwd->pw_uid != 0)
314: rootlogin = 0;
1.32 millert 315: if (rval == 1) {
316: /* Fall back on password file. */
1.1 deraadt 317: if (pwd->pw_uid != 0)
318: rootlogin = 0;
319: rval = pwcheck(username, p, salt, pwd->pw_passwd);
320: }
1.32 millert 321: if (rval == 0)
322: authok = 1;
1.1 deraadt 323: #else
324: rval = pwcheck(username, p, salt, pwd->pw_passwd);
325: #endif
1.23 millert 326: } else {
1.25 millert 327: #ifdef SKEY
328: if (strcasecmp(p, "s/key") == 0)
329: (void)skey_authenticate(username);
330: else
331: #endif
332: {
333: useconds_t us;
334:
335: /*
336: * Sleep between 1 and 3 seconds
337: * to emulate a crypt.
338: */
339: us = arc4random() % 3000000;
340: usleep(us);
341: }
342: rval = 1;
1.1 deraadt 343: }
344: memset(p, 0, strlen(p));
345:
346: (void)setpriority(PRIO_PROCESS, 0, 0);
347:
348: ttycheck:
349: /*
350: * If trying to log in as root without Kerberos,
351: * but with insecure terminal, refuse the login attempt.
352: */
353: #if defined(KERBEROS) || defined(KERBEROS5)
1.31 millert 354: if (authok == 1)
1.1 deraadt 355: #endif
1.29 millert 356: /* if logging in as root, user must be on a secure tty */
1.31 millert 357: if (pwd && rval == 0 && (!rootlogin || rootterm(tty)))
1.29 millert 358: break;
359:
360: /*
361: * We don't want to give out info to an attacker trying
362: * to guess root's password so we always say "login refused"
363: * in that case, not "Login incorrect".
364: */
365: if (rootlogin && !rootterm(tty)) {
1.1 deraadt 366: (void)fprintf(stderr,
367: "%s login refused on this terminal.\n",
1.29 millert 368: pwd ? pwd->pw_name : "root");
1.1 deraadt 369: if (hostname)
370: syslog(LOG_NOTICE,
1.14 millert 371: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
1.29 millert 372: pwd ? pwd->pw_name : "root",
373: rusername ? rusername : "",
1.14 millert 374: rusername ? "@" : "", hostname, tty);
1.1 deraadt 375: else
376: syslog(LOG_NOTICE,
377: "LOGIN %s REFUSED ON TTY %s",
1.29 millert 378: pwd ? pwd->pw_name : "root", tty);
379: } else
380: (void)printf("Login incorrect\n");
1.1 deraadt 381: failures++;
1.13 millert 382: if (pwd)
1.14 millert 383: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.1 deraadt 384: /* we allow 10 tries, but after 3 we start backing off */
385: if (++cnt > 3) {
386: if (cnt >= 10) {
387: badlogin(username);
388: sleepexit(1);
389: }
390: sleep((u_int)((cnt - 3) * 5));
391: }
392: }
393:
394: /* committed to login -- turn off timeout */
395: (void)alarm((u_int)0);
396:
397: endpwent();
398:
399: /* if user not super-user, check for disabled logins */
400: if (!rootlogin)
401: checknologin();
402:
1.5 deraadt 403: setegid(pwd->pw_gid);
404: seteuid(pwd->pw_uid);
405:
1.1 deraadt 406: if (chdir(pwd->pw_dir) < 0) {
407: (void)printf("No home directory %s!\n", pwd->pw_dir);
1.30 millert 408: if (login_getcapbool(lc, "requirehome", 0))
409: exit(1);
1.1 deraadt 410: if (chdir("/"))
411: exit(0);
412: pwd->pw_dir = "/";
413: (void)printf("Logging in with home = \"/\".\n");
414: }
415:
1.30 millert 416: shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
417: if (*shell == '\0')
418: shell = _PATH_BSHELL;
419: else if (strlen(shell) >= MAXPATHLEN) {
420: syslog(LOG_ERR, "shell path too long: %s", shell);
421: warnx("invalid shell");
422: sleepexit(1);
423: }
424:
1.19 downsj 425: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
1.30 millert 426: login_getcapbool(lc, "hushlogin", 0) ||
427: (access(_PATH_HUSHLOGIN, F_OK) == 0));
1.5 deraadt 428:
429: seteuid(0);
430: setegid(0); /* XXX use a saved gid instead? */
1.1 deraadt 431:
432: if (pwd->pw_change || pwd->pw_expire)
433: (void)gettimeofday(&tp, (struct timezone *)NULL);
1.33 millert 434: if (pwd->pw_expire) {
435: if (tp.tv_sec >= pwd->pw_expire) {
436: (void)printf("Sorry -- your account has expired.\n");
437: sleepexit(1);
438: } else if (!quietlog &&pwd->pw_expire - tp.tv_sec <
439: login_getcaptime(lc, "expire-warn",
440: 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY))
441: (void)printf("Warning: your account expires on %s",
442: ctime(&pwd->pw_expire));
443: }
1.24 art 444: if (pwd->pw_change) {
1.1 deraadt 445: if (tp.tv_sec >= pwd->pw_change) {
446: (void)printf("Sorry -- your password has expired.\n");
447: sleepexit(1);
1.30 millert 448: } else if (!quietlog && pwd->pw_change - tp.tv_sec <
449: login_getcaptime(lc, "password-warn",
450: 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY))
1.1 deraadt 451: (void)printf("Warning: your password expires on %s",
452: ctime(&pwd->pw_change));
1.24 art 453: }
1.1 deraadt 454:
455: /* Nothing else left to fail -- really log in. */
1.11 millert 456: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 457: memset((void *)&utmp, 0, sizeof(utmp));
458: (void)time(&utmp.ut_time);
459: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
460: if (hostname)
461: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
462: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
463: login(&utmp);
464:
1.13 millert 465: if (!quietlog)
466: (void)check_failedlogin(pwd->pw_uid);
1.1 deraadt 467: dolastlog(quietlog);
1.6 deraadt 468:
469: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
1.1 deraadt 470:
471: (void)chown(ttyn, pwd->pw_uid,
472: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
473: #if defined(KERBEROS) || defined(KERBEROS5)
474: /* Fork so that we can call kdestroy */
475: if (krbtkfile_env)
476: dofork();
477: #endif
478:
479: /* Destroy environment unless user has requested its preservation. */
1.24 art 480: if (!pflag) {
1.22 deraadt 481: if ((environ = calloc(1, sizeof (char *))) == NULL)
482: err(1, "calloc");
1.24 art 483: } else {
1.9 millert 484: char **cpp, **cpp2;
485:
486: for (cpp2 = cpp = environ; *cpp; cpp++) {
487: if (strncmp(*cpp, "LD_", 3) &&
1.29 millert 488: strncmp(*cpp, "ENV=", 4) &&
489: strncmp(*cpp, "BASH_ENV=", 9) &&
1.9 millert 490: strncmp(*cpp, "IFS=", 4))
491: *cpp2++ = *cpp;
492: }
493: *cpp2 = 0;
494: }
1.30 millert 495: /* Note: setusercontext(3) will set PATH */
1.34 deraadt 496: if (setenv("HOME", pwd->pw_dir, 1) == -1 ||
497: setenv("SHELL", shell, 1) == -1) {
498: warn("unable to setenv()");
499: exit(1);
500: }
1.1 deraadt 501: if (term[0] == '\0')
1.29 millert 502: (void)strlcpy(term, stypeof(tty), sizeof(term));
1.34 deraadt 503: if (setenv("TERM", term, 0) == -1 ||
504: setenv("LOGNAME", pwd->pw_name, 1) == -1 ||
505: setenv("USER", pwd->pw_name, 1) == -1) {
506: warn("unable to setenv()");
507: exit(1);
508: }
509: if (hostname) {
510: if (setenv("REMOTEHOST", hostname, 1) == -1) {
511: warn("unable to setenv()");
512: exit(1);
513: }
514: }
515: if (rusername) {
516: if (setenv("REMOTEUSER", rusername, 1) == -1) {
517: warn("unable to setenv()");
518: exit(1);
519: }
520: }
1.1 deraadt 521: #ifdef KERBEROS
1.34 deraadt 522: if (krbtkfile_env) {
523: if (setenv("KRBTKFILE", krbtkfile_env, 1) == -1) {
524: warn("unable to setenv()");
525: exit(1);
526: }
527: }
1.1 deraadt 528: #endif
529: #ifdef KERBEROS5
1.34 deraadt 530: if (krbtkfile_env) {
531: if (setenv("KRB5CCNAME", krbtkfile_env, 1) == -1) {
532: warn("unable to setenv()");
533: exit(1);
534: }
535: }
1.1 deraadt 536: #endif
537: /* If fflag is on, assume caller/authenticator has logged root login. */
1.24 art 538: if (rootlogin && fflag == 0) {
1.1 deraadt 539: if (hostname)
1.14 millert 540: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
541: username, tty, rusername ? rusername : "",
542: rusername ? "@" : "", hostname);
1.1 deraadt 543: else
544: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
1.24 art 545: }
1.1 deraadt 546:
547: #if defined(KERBEROS) || defined(KERBEROS5)
548: if (!quietlog && notickets == 1)
549: (void)printf("Warning: no Kerberos tickets issued.\n");
550: #endif
551:
552: if (!quietlog) {
1.2 deraadt 553: #if 0
1.1 deraadt 554: (void)printf("%s\n\t%s %s\n\n",
555: "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
556: "The Regents of the University of California. ",
557: "All rights reserved.");
1.2 deraadt 558: #endif
1.1 deraadt 559: motd();
560: (void)snprintf(tbuf,
561: sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
562: if (stat(tbuf, &st) == 0 && st.st_size != 0)
563: (void)printf("You have %smail.\n",
564: (st.st_mtime > st.st_atime) ? "new " : "");
565: }
566:
567: (void)signal(SIGALRM, SIG_DFL);
568: (void)signal(SIGQUIT, SIG_DFL);
569: (void)signal(SIGINT, SIG_DFL);
570: (void)signal(SIGTSTP, SIG_IGN);
571:
572: tbuf[0] = '-';
1.30 millert 573: (void)strlcpy(tbuf + 1, (p = strrchr(shell, '/')) ?
574: p + 1 : shell, sizeof tbuf - 1);
1.1 deraadt 575:
576: /* Discard permissions last so can't get killed and drop core. */
1.30 millert 577: if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL)) {
578: warn("unable to set user context");
579: exit(1);
1.15 tholo 580: }
1.30 millert 581:
1.24 art 582: #ifdef KERBEROS
583: kgettokens(pwd->pw_dir);
584: #endif
1.1 deraadt 585:
1.30 millert 586: execlp(shell, tbuf, 0);
587: err(1, "%s", shell);
1.1 deraadt 588: }
589:
590: int
591: pwcheck(user, p, salt, passwd)
592: char *user, *p, *salt, *passwd;
593: {
594: #ifdef SKEY
1.8 millert 595: if (strcasecmp(p, "s/key") == 0)
1.7 deraadt 596: return skey_authenticate(user);
1.1 deraadt 597: #endif
598: return strcmp(crypt(p, salt), passwd);
599: }
600:
601: #if defined(KERBEROS) || defined(KERBEROS5)
602: #define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
603: #else
604: #define NBUFSIZ (UT_NAMESIZE + 1)
605: #endif
606:
607: #if defined(KERBEROS) || defined(KERBEROS5)
608: /*
609: * This routine handles cleanup stuff, and the like.
610: * It exists only in the child process.
611: */
612: #include <sys/wait.h>
613: void
614: dofork()
615: {
616: int child;
617:
618: if (!(child = fork()))
619: return; /* Child process */
620:
621: /* Setup stuff? This would be things we could do in parallel with login */
622: (void) chdir("/"); /* Let's not keep the fs busy... */
623:
624: /* If we're the parent, watch the child until it dies */
625: while (wait(0) != child)
626: ;
627:
628: /* Cleanup stuff */
629: /* Run kdestroy to destroy tickets */
630: kdestroy();
631:
632: /* Leave */
633: exit(0);
634: }
635: #endif
636:
637: void
638: getloginname()
639: {
640: int ch;
641: char *p;
642: static char nbuf[NBUFSIZ];
643:
644: for (;;) {
645: (void)printf("login: ");
646: for (p = nbuf; (ch = getchar()) != '\n'; ) {
647: if (ch == EOF) {
648: badlogin(username);
649: exit(0);
650: }
651: if (p < nbuf + (NBUFSIZ - 1))
652: *p++ = ch;
653: }
1.24 art 654: if (p > nbuf) {
1.1 deraadt 655: if (nbuf[0] == '-')
656: (void)fprintf(stderr,
657: "login names may not start with '-'.\n");
658: else {
659: *p = '\0';
660: username = nbuf;
661: break;
662: }
1.24 art 663: }
1.1 deraadt 664: }
665: }
666:
667: int
668: rootterm(ttyn)
669: char *ttyn;
670: {
671: struct ttyent *t;
672:
673: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
674: }
675:
676: jmp_buf motdinterrupt;
677:
678: void
679: motd()
680: {
681: int fd, nchars;
682: sig_t oldint;
683: char tbuf[8192];
1.30 millert 684: char *motd;
685:
686: motd = login_getcapstr(lc, "welcome", _PATH_MOTDFILE, _PATH_MOTDFILE);
1.1 deraadt 687:
1.30 millert 688: if ((fd = open(motd, O_RDONLY, 0)) < 0)
1.1 deraadt 689: return;
690: oldint = signal(SIGINT, sigint);
691: if (setjmp(motdinterrupt) == 0)
692: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
693: (void)write(fileno(stdout), tbuf, nchars);
694: (void)signal(SIGINT, oldint);
695: (void)close(fd);
696: }
697:
698: /* ARGSUSED */
699: void
700: sigint(signo)
701: int signo;
702: {
703: longjmp(motdinterrupt, 1);
704: }
705:
706: /* ARGSUSED */
707: void
708: timedout(signo)
709: int signo;
710: {
711: (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
712: exit(0);
713: }
714:
715: void
716: checknologin()
717: {
718: int fd, nchars;
1.30 millert 719: char *nologin;
1.1 deraadt 720: char tbuf[8192];
721:
1.30 millert 722: if (!login_getcapbool(lc, "ignorenologin", 0)) {
723: nologin = login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
724: _PATH_NOLOGIN);
725: if ((fd = open(nologin, O_RDONLY, 0)) >= 0) {
726: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
727: (void)write(fileno(stdout), tbuf, nchars);
728: sleepexit(0);
729: }
1.1 deraadt 730: }
731: }
732:
733: void
734: dolastlog(quiet)
735: int quiet;
736: {
737: struct lastlog ll;
738: int fd;
739:
740: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1.26 millert 741: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
1.1 deraadt 742: if (!quiet) {
743: if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
744: ll.ll_time != 0) {
745: (void)printf("Last login: %.*s ",
746: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 747: (void)printf("on %.*s",
748: (int)sizeof(ll.ll_line),
749: ll.ll_line);
1.1 deraadt 750: if (*ll.ll_host != '\0')
1.14 millert 751: (void)printf(" from %.*s",
1.1 deraadt 752: (int)sizeof(ll.ll_host),
753: ll.ll_host);
1.14 millert 754: (void)putchar('\n');
1.1 deraadt 755: }
1.26 millert 756: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll),
757: SEEK_SET);
1.1 deraadt 758: }
759: memset((void *)&ll, 0, sizeof(ll));
760: (void)time(&ll.ll_time);
761: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
762: if (hostname)
763: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
764: (void)write(fd, (char *)&ll, sizeof(ll));
765: (void)close(fd);
766: }
767: }
768:
769: void
770: badlogin(name)
771: char *name;
772: {
773: if (failures == 0)
774: return;
775: if (hostname) {
1.14 millert 776: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s%s%s",
777: failures, failures > 1 ? "S" : "",
778: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.1 deraadt 779: syslog(LOG_AUTHPRIV|LOG_NOTICE,
1.14 millert 780: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
781: failures, failures > 1 ? "S" : "",
782: rusername ? rusername : "", rusername ? "@" : "",
783: hostname, name);
1.1 deraadt 784: } else {
785: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
786: failures, failures > 1 ? "S" : "", tty);
787: syslog(LOG_AUTHPRIV|LOG_NOTICE,
788: "%d LOGIN FAILURE%s ON %s, %s",
789: failures, failures > 1 ? "S" : "", tty, name);
790: }
791: }
792:
793: #undef UNKNOWN
794: #define UNKNOWN "su"
795:
796: char *
797: stypeof(ttyid)
798: char *ttyid;
799: {
800: struct ttyent *t;
801:
1.30 millert 802: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type :
803: login_getcapstr(lc, "term", UNKNOWN, UNKNOWN));
1.1 deraadt 804: }
805:
806: void
807: sleepexit(eval)
808: int eval;
809: {
810: (void)sleep(5);
811: exit(eval);
1.11 millert 812: }
813:
814: void
815: sighup(signum)
816: int signum;
817: {
818: if (username)
819: badlogin(username);
1.30 millert 820: exit(0);
1.1 deraadt 821: }
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