Annotation of src/usr.bin/login/login.c, Revision 1.33
1.33 ! millert 1: /* $OpenBSD: login.c,v 1.32 2000/08/24 20:08:06 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: */
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
1.33 ! millert 47: static char rcsid[] = "$OpenBSD: login.c,v 1.32 2000/08/24 20:08:06 millert 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();
227: #endif
228: if (ask) {
229: fflag = 0;
230: getloginname();
231: }
232: rootlogin = 0;
1.18 flipk 233:
234: #if defined(KERBEROS) || defined(KERBEROS5)
235: /*
236: * Why should anyone with a root instance be able
237: * to be root here?
238: */
1.17 dm 239: instance = "";
1.18 flipk 240: #endif
1.1 deraadt 241: #ifdef KERBEROS
242: if ((instance = strchr(username, '.')) != NULL) {
243: if (strncmp(instance, ".root", 5) == 0)
244: rootlogin = 1;
245: *instance++ = '\0';
246: } else
247: instance = "";
248: #endif
249: #ifdef KERBEROS5
250: if ((instance = strchr(username, '/')) != NULL) {
251: if (strncmp(instance, "/root", 5) == 0)
252: rootlogin = 1;
253: *instance++ = '\0';
254: } else
255: instance = "";
256: #endif
257: if (strlen(username) > UT_NAMESIZE)
258: username[UT_NAMESIZE] = '\0';
259:
260: /*
261: * Note if trying multiple user names; log failures for
262: * previous user name, but don't bother logging one failure
263: * for nonexistent name (mistyped username).
264: */
265: if (failures && strcmp(tbuf, username)) {
266: if (failures > (pwd ? 0 : 1))
267: badlogin(tbuf);
268: failures = 0;
269: }
1.29 millert 270: (void)strlcpy(tbuf, username, sizeof tbuf);
1.1 deraadt 271:
1.12 millert 272: if ((pwd = getpwnam(username)))
1.1 deraadt 273: salt = pwd->pw_passwd;
274: else
275: salt = "xx";
1.30 millert 276: lc = login_getclass(pwd ? pwd->pw_class : LOGIN_DEFCLASS);
277: if (!lc)
278: err(1, "unable to get login class");
1.1 deraadt 279:
280: /*
1.29 millert 281: * If we have a valid account name, and it doesn't have a
1.1 deraadt 282: * password, or the -f option was specified and the caller
283: * is root or the caller isn't changing their uid, don't
284: * authenticate.
285: */
286: if (pwd) {
287: if (pwd->pw_uid == 0)
288: rootlogin = 1;
289:
290: if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
291: /* already authenticated */
292: break;
293: } else if (pwd->pw_passwd[0] == '\0') {
294: /* pretend password okay */
295: rval = 0;
296: goto ttycheck;
297: }
298: }
299:
300: fflag = 0;
301:
302: (void)setpriority(PRIO_PROCESS, 0, -4);
303:
304: p = getpass("Password:");
305:
306: if (pwd) {
307: #if defined(KERBEROS) || defined(KERBEROS5)
308: rval = klogin(pwd, instance, localhost, p);
309: if (rval != 0 && rootlogin && pwd->pw_uid != 0)
310: rootlogin = 0;
1.32 millert 311: if (rval == 1) {
312: /* Fall back on password file. */
1.1 deraadt 313: if (pwd->pw_uid != 0)
314: rootlogin = 0;
315: rval = pwcheck(username, p, salt, pwd->pw_passwd);
316: }
1.32 millert 317: if (rval == 0)
318: authok = 1;
1.1 deraadt 319: #else
320: rval = pwcheck(username, p, salt, pwd->pw_passwd);
321: #endif
1.23 millert 322: } else {
1.25 millert 323: #ifdef SKEY
324: if (strcasecmp(p, "s/key") == 0)
325: (void)skey_authenticate(username);
326: else
327: #endif
328: {
329: useconds_t us;
330:
331: /*
332: * Sleep between 1 and 3 seconds
333: * to emulate a crypt.
334: */
335: us = arc4random() % 3000000;
336: usleep(us);
337: }
338: rval = 1;
1.1 deraadt 339: }
340: memset(p, 0, strlen(p));
341:
342: (void)setpriority(PRIO_PROCESS, 0, 0);
343:
344: ttycheck:
345: /*
346: * If trying to log in as root without Kerberos,
347: * but with insecure terminal, refuse the login attempt.
348: */
349: #if defined(KERBEROS) || defined(KERBEROS5)
1.31 millert 350: if (authok == 1)
1.1 deraadt 351: #endif
1.29 millert 352: /* if logging in as root, user must be on a secure tty */
1.31 millert 353: if (pwd && rval == 0 && (!rootlogin || rootterm(tty)))
1.29 millert 354: break;
355:
356: /*
357: * We don't want to give out info to an attacker trying
358: * to guess root's password so we always say "login refused"
359: * in that case, not "Login incorrect".
360: */
361: if (rootlogin && !rootterm(tty)) {
1.1 deraadt 362: (void)fprintf(stderr,
363: "%s login refused on this terminal.\n",
1.29 millert 364: pwd ? pwd->pw_name : "root");
1.1 deraadt 365: if (hostname)
366: syslog(LOG_NOTICE,
1.14 millert 367: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
1.29 millert 368: pwd ? pwd->pw_name : "root",
369: rusername ? rusername : "",
1.14 millert 370: rusername ? "@" : "", hostname, tty);
1.1 deraadt 371: else
372: syslog(LOG_NOTICE,
373: "LOGIN %s REFUSED ON TTY %s",
1.29 millert 374: pwd ? pwd->pw_name : "root", tty);
375: } else
376: (void)printf("Login incorrect\n");
1.1 deraadt 377: failures++;
1.13 millert 378: if (pwd)
1.14 millert 379: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.1 deraadt 380: /* we allow 10 tries, but after 3 we start backing off */
381: if (++cnt > 3) {
382: if (cnt >= 10) {
383: badlogin(username);
384: sleepexit(1);
385: }
386: sleep((u_int)((cnt - 3) * 5));
387: }
388: }
389:
390: /* committed to login -- turn off timeout */
391: (void)alarm((u_int)0);
392:
393: endpwent();
394:
395: /* if user not super-user, check for disabled logins */
396: if (!rootlogin)
397: checknologin();
398:
1.5 deraadt 399: setegid(pwd->pw_gid);
400: seteuid(pwd->pw_uid);
401:
1.1 deraadt 402: if (chdir(pwd->pw_dir) < 0) {
403: (void)printf("No home directory %s!\n", pwd->pw_dir);
1.30 millert 404: if (login_getcapbool(lc, "requirehome", 0))
405: exit(1);
1.1 deraadt 406: if (chdir("/"))
407: exit(0);
408: pwd->pw_dir = "/";
409: (void)printf("Logging in with home = \"/\".\n");
410: }
411:
1.30 millert 412: shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
413: if (*shell == '\0')
414: shell = _PATH_BSHELL;
415: else if (strlen(shell) >= MAXPATHLEN) {
416: syslog(LOG_ERR, "shell path too long: %s", shell);
417: warnx("invalid shell");
418: sleepexit(1);
419: }
420:
1.19 downsj 421: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
1.30 millert 422: login_getcapbool(lc, "hushlogin", 0) ||
423: (access(_PATH_HUSHLOGIN, F_OK) == 0));
1.5 deraadt 424:
425: seteuid(0);
426: setegid(0); /* XXX use a saved gid instead? */
1.1 deraadt 427:
428: if (pwd->pw_change || pwd->pw_expire)
429: (void)gettimeofday(&tp, (struct timezone *)NULL);
1.33 ! millert 430: if (pwd->pw_expire) {
! 431: if (tp.tv_sec >= pwd->pw_expire) {
! 432: (void)printf("Sorry -- your account has expired.\n");
! 433: sleepexit(1);
! 434: } else if (!quietlog &&pwd->pw_expire - tp.tv_sec <
! 435: login_getcaptime(lc, "expire-warn",
! 436: 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY))
! 437: (void)printf("Warning: your account expires on %s",
! 438: ctime(&pwd->pw_expire));
! 439: }
1.24 art 440: if (pwd->pw_change) {
1.1 deraadt 441: if (tp.tv_sec >= pwd->pw_change) {
442: (void)printf("Sorry -- your password has expired.\n");
443: sleepexit(1);
1.30 millert 444: } else if (!quietlog && pwd->pw_change - tp.tv_sec <
445: login_getcaptime(lc, "password-warn",
446: 2 * DAYSPERWEEK * SECSPERDAY, 2 * DAYSPERWEEK * SECSPERDAY))
1.1 deraadt 447: (void)printf("Warning: your password expires on %s",
448: ctime(&pwd->pw_change));
1.24 art 449: }
1.1 deraadt 450:
451: /* Nothing else left to fail -- really log in. */
1.11 millert 452: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 453: memset((void *)&utmp, 0, sizeof(utmp));
454: (void)time(&utmp.ut_time);
455: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
456: if (hostname)
457: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
458: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
459: login(&utmp);
460:
1.13 millert 461: if (!quietlog)
462: (void)check_failedlogin(pwd->pw_uid);
1.1 deraadt 463: dolastlog(quietlog);
1.6 deraadt 464:
465: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
1.1 deraadt 466:
467: (void)chown(ttyn, pwd->pw_uid,
468: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
469: #if defined(KERBEROS) || defined(KERBEROS5)
470: /* Fork so that we can call kdestroy */
471: if (krbtkfile_env)
472: dofork();
473: #endif
474:
475: /* Destroy environment unless user has requested its preservation. */
1.24 art 476: if (!pflag) {
1.22 deraadt 477: if ((environ = calloc(1, sizeof (char *))) == NULL)
478: err(1, "calloc");
1.24 art 479: } else {
1.9 millert 480: char **cpp, **cpp2;
481:
482: for (cpp2 = cpp = environ; *cpp; cpp++) {
483: if (strncmp(*cpp, "LD_", 3) &&
1.29 millert 484: strncmp(*cpp, "ENV=", 4) &&
485: strncmp(*cpp, "BASH_ENV=", 9) &&
1.9 millert 486: strncmp(*cpp, "IFS=", 4))
487: *cpp2++ = *cpp;
488: }
489: *cpp2 = 0;
490: }
1.30 millert 491: /* Note: setusercontext(3) will set PATH */
1.1 deraadt 492: (void)setenv("HOME", pwd->pw_dir, 1);
1.30 millert 493: (void)setenv("SHELL", shell, 1);
1.1 deraadt 494: if (term[0] == '\0')
1.29 millert 495: (void)strlcpy(term, stypeof(tty), sizeof(term));
1.1 deraadt 496: (void)setenv("TERM", term, 0);
497: (void)setenv("LOGNAME", pwd->pw_name, 1);
498: (void)setenv("USER", pwd->pw_name, 1);
1.14 millert 499: if (hostname)
500: (void)setenv("REMOTEHOST", hostname, 1);
501: if (rusername)
502: (void)setenv("REMOTEUSER", rusername, 1);
1.1 deraadt 503: #ifdef KERBEROS
504: if (krbtkfile_env)
505: (void)setenv("KRBTKFILE", krbtkfile_env, 1);
506: #endif
507: #ifdef KERBEROS5
508: if (krbtkfile_env)
509: (void)setenv("KRB5CCNAME", krbtkfile_env, 1);
510: #endif
511: /* If fflag is on, assume caller/authenticator has logged root login. */
1.24 art 512: if (rootlogin && fflag == 0) {
1.1 deraadt 513: if (hostname)
1.14 millert 514: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
515: username, tty, rusername ? rusername : "",
516: rusername ? "@" : "", hostname);
1.1 deraadt 517: else
518: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
1.24 art 519: }
1.1 deraadt 520:
521: #if defined(KERBEROS) || defined(KERBEROS5)
522: if (!quietlog && notickets == 1)
523: (void)printf("Warning: no Kerberos tickets issued.\n");
524: #endif
525:
526: if (!quietlog) {
1.2 deraadt 527: #if 0
1.1 deraadt 528: (void)printf("%s\n\t%s %s\n\n",
529: "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
530: "The Regents of the University of California. ",
531: "All rights reserved.");
1.2 deraadt 532: #endif
1.1 deraadt 533: motd();
534: (void)snprintf(tbuf,
535: sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
536: if (stat(tbuf, &st) == 0 && st.st_size != 0)
537: (void)printf("You have %smail.\n",
538: (st.st_mtime > st.st_atime) ? "new " : "");
539: }
540:
541: (void)signal(SIGALRM, SIG_DFL);
542: (void)signal(SIGQUIT, SIG_DFL);
543: (void)signal(SIGINT, SIG_DFL);
544: (void)signal(SIGTSTP, SIG_IGN);
545:
546: tbuf[0] = '-';
1.30 millert 547: (void)strlcpy(tbuf + 1, (p = strrchr(shell, '/')) ?
548: p + 1 : shell, sizeof tbuf - 1);
1.1 deraadt 549:
550: /* Discard permissions last so can't get killed and drop core. */
1.30 millert 551: if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL)) {
552: warn("unable to set user context");
553: exit(1);
1.15 tholo 554: }
1.30 millert 555:
1.24 art 556: #ifdef KERBEROS
557: kgettokens(pwd->pw_dir);
558: #endif
1.1 deraadt 559:
1.30 millert 560: execlp(shell, tbuf, 0);
561: err(1, "%s", shell);
1.1 deraadt 562: }
563:
564: int
565: pwcheck(user, p, salt, passwd)
566: char *user, *p, *salt, *passwd;
567: {
568: #ifdef SKEY
1.8 millert 569: if (strcasecmp(p, "s/key") == 0)
1.7 deraadt 570: return skey_authenticate(user);
1.1 deraadt 571: #endif
572: return strcmp(crypt(p, salt), passwd);
573: }
574:
575: #if defined(KERBEROS) || defined(KERBEROS5)
576: #define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
577: #else
578: #define NBUFSIZ (UT_NAMESIZE + 1)
579: #endif
580:
581: #if defined(KERBEROS) || defined(KERBEROS5)
582: /*
583: * This routine handles cleanup stuff, and the like.
584: * It exists only in the child process.
585: */
586: #include <sys/wait.h>
587: void
588: dofork()
589: {
590: int child;
591:
592: if (!(child = fork()))
593: return; /* Child process */
594:
595: /* Setup stuff? This would be things we could do in parallel with login */
596: (void) chdir("/"); /* Let's not keep the fs busy... */
597:
598: /* If we're the parent, watch the child until it dies */
599: while (wait(0) != child)
600: ;
601:
602: /* Cleanup stuff */
603: /* Run kdestroy to destroy tickets */
604: kdestroy();
605:
606: /* Leave */
607: exit(0);
608: }
609: #endif
610:
611: void
612: getloginname()
613: {
614: int ch;
615: char *p;
616: static char nbuf[NBUFSIZ];
617:
618: for (;;) {
619: (void)printf("login: ");
620: for (p = nbuf; (ch = getchar()) != '\n'; ) {
621: if (ch == EOF) {
622: badlogin(username);
623: exit(0);
624: }
625: if (p < nbuf + (NBUFSIZ - 1))
626: *p++ = ch;
627: }
1.24 art 628: if (p > nbuf) {
1.1 deraadt 629: if (nbuf[0] == '-')
630: (void)fprintf(stderr,
631: "login names may not start with '-'.\n");
632: else {
633: *p = '\0';
634: username = nbuf;
635: break;
636: }
1.24 art 637: }
1.1 deraadt 638: }
639: }
640:
641: int
642: rootterm(ttyn)
643: char *ttyn;
644: {
645: struct ttyent *t;
646:
647: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
648: }
649:
650: jmp_buf motdinterrupt;
651:
652: void
653: motd()
654: {
655: int fd, nchars;
656: sig_t oldint;
657: char tbuf[8192];
1.30 millert 658: char *motd;
659:
660: motd = login_getcapstr(lc, "welcome", _PATH_MOTDFILE, _PATH_MOTDFILE);
1.1 deraadt 661:
1.30 millert 662: if ((fd = open(motd, O_RDONLY, 0)) < 0)
1.1 deraadt 663: return;
664: oldint = signal(SIGINT, sigint);
665: if (setjmp(motdinterrupt) == 0)
666: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
667: (void)write(fileno(stdout), tbuf, nchars);
668: (void)signal(SIGINT, oldint);
669: (void)close(fd);
670: }
671:
672: /* ARGSUSED */
673: void
674: sigint(signo)
675: int signo;
676: {
677: longjmp(motdinterrupt, 1);
678: }
679:
680: /* ARGSUSED */
681: void
682: timedout(signo)
683: int signo;
684: {
685: (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
686: exit(0);
687: }
688:
689: void
690: checknologin()
691: {
692: int fd, nchars;
1.30 millert 693: char *nologin;
1.1 deraadt 694: char tbuf[8192];
695:
1.30 millert 696: if (!login_getcapbool(lc, "ignorenologin", 0)) {
697: nologin = login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
698: _PATH_NOLOGIN);
699: if ((fd = open(nologin, O_RDONLY, 0)) >= 0) {
700: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
701: (void)write(fileno(stdout), tbuf, nchars);
702: sleepexit(0);
703: }
1.1 deraadt 704: }
705: }
706:
707: void
708: dolastlog(quiet)
709: int quiet;
710: {
711: struct lastlog ll;
712: int fd;
713:
714: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1.26 millert 715: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
1.1 deraadt 716: if (!quiet) {
717: if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
718: ll.ll_time != 0) {
719: (void)printf("Last login: %.*s ",
720: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 721: (void)printf("on %.*s",
722: (int)sizeof(ll.ll_line),
723: ll.ll_line);
1.1 deraadt 724: if (*ll.ll_host != '\0')
1.14 millert 725: (void)printf(" from %.*s",
1.1 deraadt 726: (int)sizeof(ll.ll_host),
727: ll.ll_host);
1.14 millert 728: (void)putchar('\n');
1.1 deraadt 729: }
1.26 millert 730: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll),
731: SEEK_SET);
1.1 deraadt 732: }
733: memset((void *)&ll, 0, sizeof(ll));
734: (void)time(&ll.ll_time);
735: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
736: if (hostname)
737: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
738: (void)write(fd, (char *)&ll, sizeof(ll));
739: (void)close(fd);
740: }
741: }
742:
743: void
744: badlogin(name)
745: char *name;
746: {
747: if (failures == 0)
748: return;
749: if (hostname) {
1.14 millert 750: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s%s%s",
751: failures, failures > 1 ? "S" : "",
752: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.1 deraadt 753: syslog(LOG_AUTHPRIV|LOG_NOTICE,
1.14 millert 754: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
755: failures, failures > 1 ? "S" : "",
756: rusername ? rusername : "", rusername ? "@" : "",
757: hostname, name);
1.1 deraadt 758: } else {
759: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
760: failures, failures > 1 ? "S" : "", tty);
761: syslog(LOG_AUTHPRIV|LOG_NOTICE,
762: "%d LOGIN FAILURE%s ON %s, %s",
763: failures, failures > 1 ? "S" : "", tty, name);
764: }
765: }
766:
767: #undef UNKNOWN
768: #define UNKNOWN "su"
769:
770: char *
771: stypeof(ttyid)
772: char *ttyid;
773: {
774: struct ttyent *t;
775:
1.30 millert 776: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type :
777: login_getcapstr(lc, "term", UNKNOWN, UNKNOWN));
1.1 deraadt 778: }
779:
780: void
781: sleepexit(eval)
782: int eval;
783: {
784: (void)sleep(5);
785: exit(eval);
1.11 millert 786: }
787:
788: void
789: sighup(signum)
790: int signum;
791: {
792: if (username)
793: badlogin(username);
1.30 millert 794: exit(0);
1.1 deraadt 795: }
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