Annotation of src/usr.bin/login/login.c, Revision 1.24
1.24 ! art 1: /* $OpenBSD: login.c,v 1.23 1997/11/04 19:01:05 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
1.24 ! art 47: static char rcsid[] = "$OpenBSD: login.c,v 1.23 1997/11/04 19:01:05 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>
60: #include <sys/file.h>
1.11 millert 61: #include <sys/wait.h>
1.1 deraadt 62:
63: #include <err.h>
64: #include <errno.h>
65: #include <grp.h>
66: #include <pwd.h>
67: #include <setjmp.h>
68: #include <signal.h>
69: #include <stdio.h>
70: #include <stdlib.h>
71: #include <string.h>
72: #include <syslog.h>
73: #include <ttyent.h>
74: #include <tzfile.h>
75: #include <unistd.h>
76: #include <utmp.h>
1.3 deraadt 77: #include <util.h>
1.24 ! art 78: #include <skey.h>
1.1 deraadt 79:
80: #include "pathnames.h"
81:
82: void badlogin __P((char *));
83: void checknologin __P((void));
84: void dolastlog __P((int));
85: void getloginname __P((void));
86: void motd __P((void));
87: int rootterm __P((char *));
88: void sigint __P((int));
1.11 millert 89: void sighup __P((int));
1.1 deraadt 90: void sleepexit __P((int));
91: char *stypeof __P((char *));
92: void timedout __P((int));
93: int pwcheck __P((char *, char *, char *, char *));
94: #if defined(KERBEROS) || defined(KERBEROS5)
95: int klogin __P((struct passwd *, char *, char *, char *));
96: void kdestroy __P((void));
97: void dofork __P((void));
1.24 ! art 98: void kgettokens __P((char *));
1.1 deraadt 99: #endif
100:
101: extern void login __P((struct utmp *));
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.
110: */
111: u_int timeout = 300;
112:
113: #if defined(KERBEROS) || defined(KERBEROS5)
114: int notickets = 1;
115: char *instance;
116: char *krbtkfile_env;
117: int authok;
118: #endif
119:
120: struct passwd *pwd;
121: int failures;
1.22 deraadt 122: char term[64], *hostname, *tty;
1.14 millert 123: char *username = NULL, *rusername = NULL;
1.1 deraadt 124:
125: int
126: main(argc, argv)
127: int argc;
128: char *argv[];
129: {
130: extern char **environ;
131: struct group *gr;
132: struct stat st;
133: struct timeval tp;
134: struct utmp utmp;
1.14 millert 135: int ask, ch, cnt, fflag, hflag, pflag, uflag, quietlog, rootlogin, rval;
1.1 deraadt 136: uid_t uid;
137: char *domain, *p, *salt, *ttyn;
138: char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
139: char localhost[MAXHOSTNAMELEN];
140:
141: (void)signal(SIGALRM, timedout);
142: (void)alarm(timeout);
143: (void)signal(SIGQUIT, SIG_IGN);
144: (void)signal(SIGINT, SIG_IGN);
1.11 millert 145: (void)signal(SIGHUP, sighup);
1.1 deraadt 146: (void)setpriority(PRIO_PROCESS, 0, 0);
147:
148: openlog("login", LOG_ODELAY, LOG_AUTH);
149:
150: /*
151: * -p is used by getty to tell login not to destroy the environment
152: * -f is used to skip a second login authentication
153: * -h is used by other servers to pass the name of the remote
154: * host to login so that it may be placed in utmp and wtmp
155: */
156: domain = NULL;
157: if (gethostname(localhost, sizeof(localhost)) < 0)
158: syslog(LOG_ERR, "couldn't get local hostname: %m");
159: else
160: domain = strchr(localhost, '.');
1.21 deraadt 161: if (domain) {
162: domain++;
163: if (*domain && strchr(domain, '.') == NULL)
164: domain = localhost;
165: }
1.1 deraadt 166:
167: fflag = hflag = pflag = 0;
168: uid = getuid();
1.16 millert 169: while ((ch = getopt(argc, argv, "fh:u:p")) != -1)
1.1 deraadt 170: switch (ch) {
171: case 'f':
172: fflag = 1;
173: break;
174: case 'h':
175: if (uid)
176: errx(1, "-h option: %s", strerror(EPERM));
177: hflag = 1;
178: if (domain && (p = strchr(optarg, '.')) &&
1.21 deraadt 179: strcasecmp(p+1, domain) == 0)
1.1 deraadt 180: *p = 0;
181: hostname = optarg;
182: break;
183: case 'p':
184: pflag = 1;
185: break;
1.14 millert 186: case 'u':
187: if (uid)
188: errx(1, "-u option: %s", strerror(EPERM));
189: uflag = 1;
190: rusername = optarg;
191: break;
1.1 deraadt 192: case '?':
193: default:
194: if (!uid)
195: syslog(LOG_ERR, "invalid flag %c", ch);
196: (void)fprintf(stderr,
197: "usage: login [-fp] [-h hostname] [username]\n");
198: exit(1);
199: }
200: argc -= optind;
201: argv += optind;
202:
203: if (*argv) {
204: username = *argv;
205: ask = 0;
206: } else
207: ask = 1;
208:
209: for (cnt = getdtablesize(); cnt > 2; cnt--)
210: (void)close(cnt);
211:
212: ttyn = ttyname(STDIN_FILENO);
213: if (ttyn == NULL || *ttyn == '\0') {
214: (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
215: ttyn = tname;
216: }
1.12 millert 217: if ((tty = strrchr(ttyn, '/')))
1.1 deraadt 218: ++tty;
219: else
220: tty = ttyn;
221:
222: for (cnt = 0;; ask = 1) {
223: #if defined(KERBEROS) || defined(KERBEROS5)
224: kdestroy();
225: #endif
226: if (ask) {
227: fflag = 0;
228: getloginname();
229: }
230: rootlogin = 0;
1.18 flipk 231:
232: #if defined(KERBEROS) || defined(KERBEROS5)
233: /*
234: * Why should anyone with a root instance be able
235: * to be root here?
236: */
1.17 dm 237: instance = "";
1.18 flipk 238: #endif
1.1 deraadt 239: #ifdef KERBEROS
240: if ((instance = strchr(username, '.')) != NULL) {
241: if (strncmp(instance, ".root", 5) == 0)
242: rootlogin = 1;
243: *instance++ = '\0';
244: } else
245: instance = "";
246: #endif
247: #ifdef KERBEROS5
248: if ((instance = strchr(username, '/')) != NULL) {
249: if (strncmp(instance, "/root", 5) == 0)
250: rootlogin = 1;
251: *instance++ = '\0';
252: } else
253: instance = "";
254: #endif
255: if (strlen(username) > UT_NAMESIZE)
256: username[UT_NAMESIZE] = '\0';
257:
258: /*
259: * Note if trying multiple user names; log failures for
260: * previous user name, but don't bother logging one failure
261: * for nonexistent name (mistyped username).
262: */
263: if (failures && strcmp(tbuf, username)) {
264: if (failures > (pwd ? 0 : 1))
265: badlogin(tbuf);
266: failures = 0;
267: }
1.20 deraadt 268: (void)strncpy(tbuf, username, sizeof tbuf-1);
269: tbuf[sizeof tbuf-1] = '\0';
1.1 deraadt 270:
1.12 millert 271: if ((pwd = getpwnam(username)))
1.1 deraadt 272: salt = pwd->pw_passwd;
273: else
274: salt = "xx";
275:
276: /*
277: * if we have a valid account name, and it doesn't have a
278: * password, or the -f option was specified and the caller
279: * is root or the caller isn't changing their uid, don't
280: * authenticate.
281: */
282: if (pwd) {
283: if (pwd->pw_uid == 0)
284: rootlogin = 1;
285:
286: if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
287: /* already authenticated */
288: break;
289: } else if (pwd->pw_passwd[0] == '\0') {
290: /* pretend password okay */
291: rval = 0;
292: goto ttycheck;
293: }
294: }
295:
296: fflag = 0;
297:
298: (void)setpriority(PRIO_PROCESS, 0, -4);
299:
300: p = getpass("Password:");
301:
302: if (pwd) {
303: #if defined(KERBEROS) || defined(KERBEROS5)
304: rval = klogin(pwd, instance, localhost, p);
305: if (rval != 0 && rootlogin && pwd->pw_uid != 0)
306: rootlogin = 0;
307: if (rval == 0)
308: authok = 1;
309: else if (rval == 1) {
310: if (pwd->pw_uid != 0)
311: rootlogin = 0;
312: rval = pwcheck(username, p, salt, pwd->pw_passwd);
313: }
314: #else
315: rval = pwcheck(username, p, salt, pwd->pw_passwd);
316: #endif
1.23 millert 317: } else {
318: rval = pwcheck(username, p, salt, "*");
1.1 deraadt 319: }
320: memset(p, 0, strlen(p));
321:
322: (void)setpriority(PRIO_PROCESS, 0, 0);
323:
324: ttycheck:
325: /*
326: * If trying to log in as root without Kerberos,
327: * but with insecure terminal, refuse the login attempt.
328: */
329: #if defined(KERBEROS) || defined(KERBEROS5)
330: if (authok == 0)
331: #endif
332: if (pwd && !rval && rootlogin && !rootterm(tty)) {
333: (void)fprintf(stderr,
334: "%s login refused on this terminal.\n",
335: pwd->pw_name);
336: if (hostname)
337: syslog(LOG_NOTICE,
1.14 millert 338: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
339: pwd->pw_name, rusername ? rusername : "",
340: rusername ? "@" : "", hostname, tty);
1.1 deraadt 341: else
342: syslog(LOG_NOTICE,
343: "LOGIN %s REFUSED ON TTY %s",
344: pwd->pw_name, tty);
345: continue;
346: }
347:
348: if (pwd && !rval)
349: break;
350:
351: (void)printf("Login incorrect\n");
352: failures++;
1.13 millert 353: if (pwd)
1.14 millert 354: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.1 deraadt 355: /* we allow 10 tries, but after 3 we start backing off */
356: if (++cnt > 3) {
357: if (cnt >= 10) {
358: badlogin(username);
359: sleepexit(1);
360: }
361: sleep((u_int)((cnt - 3) * 5));
362: }
363: }
364:
365: /* committed to login -- turn off timeout */
366: (void)alarm((u_int)0);
367:
368: endpwent();
369:
370: /* if user not super-user, check for disabled logins */
371: if (!rootlogin)
372: checknologin();
373:
1.5 deraadt 374: setegid(pwd->pw_gid);
375: seteuid(pwd->pw_uid);
376:
1.1 deraadt 377: if (chdir(pwd->pw_dir) < 0) {
378: (void)printf("No home directory %s!\n", pwd->pw_dir);
379: if (chdir("/"))
380: exit(0);
381: pwd->pw_dir = "/";
382: (void)printf("Logging in with home = \"/\".\n");
383: }
384:
1.19 downsj 385: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
386: (access(_PATH_HUSHLOGIN, F_OK) == 0));
1.5 deraadt 387:
388: seteuid(0);
389: setegid(0); /* XXX use a saved gid instead? */
1.1 deraadt 390:
391: if (pwd->pw_change || pwd->pw_expire)
392: (void)gettimeofday(&tp, (struct timezone *)NULL);
1.24 ! art 393: if (pwd->pw_change) {
1.1 deraadt 394: if (tp.tv_sec >= pwd->pw_change) {
395: (void)printf("Sorry -- your password has expired.\n");
396: sleepexit(1);
397: } else if (pwd->pw_change - tp.tv_sec <
398: 2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
399: (void)printf("Warning: your password expires on %s",
400: ctime(&pwd->pw_change));
1.24 ! art 401: }
! 402: if (pwd->pw_expire) {
1.1 deraadt 403: if (tp.tv_sec >= pwd->pw_expire) {
404: (void)printf("Sorry -- your account has expired.\n");
405: sleepexit(1);
406: } else if (pwd->pw_expire - tp.tv_sec <
407: 2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
408: (void)printf("Warning: your account expires on %s",
409: ctime(&pwd->pw_expire));
1.24 ! art 410: }
1.1 deraadt 411:
412: /* Nothing else left to fail -- really log in. */
1.11 millert 413: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 414: memset((void *)&utmp, 0, sizeof(utmp));
415: (void)time(&utmp.ut_time);
416: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
417: if (hostname)
418: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
419: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
420: login(&utmp);
421:
1.13 millert 422: if (!quietlog)
423: (void)check_failedlogin(pwd->pw_uid);
1.1 deraadt 424: dolastlog(quietlog);
1.6 deraadt 425:
426: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
1.1 deraadt 427:
428: (void)chown(ttyn, pwd->pw_uid,
429: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
430: #if defined(KERBEROS) || defined(KERBEROS5)
431: /* Fork so that we can call kdestroy */
432: if (krbtkfile_env)
433: dofork();
434: #endif
1.15 tholo 435: (void)setegid(pwd->pw_gid);
1.1 deraadt 436: (void)setgid(pwd->pw_gid);
437:
438: initgroups(username, pwd->pw_gid);
439:
440: if (*pwd->pw_shell == '\0')
441: pwd->pw_shell = _PATH_BSHELL;
442:
443: /* Destroy environment unless user has requested its preservation. */
1.24 ! art 444: if (!pflag) {
1.22 deraadt 445: if ((environ = calloc(1, sizeof (char *))) == NULL)
446: err(1, "calloc");
1.24 ! art 447: } else {
1.9 millert 448: char **cpp, **cpp2;
449:
450: for (cpp2 = cpp = environ; *cpp; cpp++) {
451: if (strncmp(*cpp, "LD_", 3) &&
452: strncmp(*cpp, "IFS=", 4))
453: *cpp2++ = *cpp;
454: }
455: *cpp2 = 0;
456: }
1.1 deraadt 457: (void)setenv("HOME", pwd->pw_dir, 1);
458: (void)setenv("SHELL", pwd->pw_shell, 1);
459: if (term[0] == '\0')
460: (void)strncpy(term, stypeof(tty), sizeof(term));
461: (void)setenv("TERM", term, 0);
462: (void)setenv("LOGNAME", pwd->pw_name, 1);
463: (void)setenv("USER", pwd->pw_name, 1);
464: (void)setenv("PATH", _PATH_DEFPATH, 0);
1.14 millert 465: if (hostname)
466: (void)setenv("REMOTEHOST", hostname, 1);
467: if (rusername)
468: (void)setenv("REMOTEUSER", rusername, 1);
1.1 deraadt 469: #ifdef KERBEROS
470: if (krbtkfile_env)
471: (void)setenv("KRBTKFILE", krbtkfile_env, 1);
472: #endif
473: #ifdef KERBEROS5
474: if (krbtkfile_env)
475: (void)setenv("KRB5CCNAME", krbtkfile_env, 1);
476: #endif
477:
478: /* If fflag is on, assume caller/authenticator has logged root login. */
1.24 ! art 479: if (rootlogin && fflag == 0) {
1.1 deraadt 480: if (hostname)
1.14 millert 481: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
482: username, tty, rusername ? rusername : "",
483: rusername ? "@" : "", hostname);
1.1 deraadt 484: else
485: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
1.24 ! art 486: }
1.1 deraadt 487:
488: #if defined(KERBEROS) || defined(KERBEROS5)
489: if (!quietlog && notickets == 1)
490: (void)printf("Warning: no Kerberos tickets issued.\n");
491: #endif
492:
493: if (!quietlog) {
1.2 deraadt 494: #if 0
1.1 deraadt 495: (void)printf("%s\n\t%s %s\n\n",
496: "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
497: "The Regents of the University of California. ",
498: "All rights reserved.");
1.2 deraadt 499: #endif
1.1 deraadt 500: motd();
501: (void)snprintf(tbuf,
502: sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
503: if (stat(tbuf, &st) == 0 && st.st_size != 0)
504: (void)printf("You have %smail.\n",
505: (st.st_mtime > st.st_atime) ? "new " : "");
506: }
507:
508: (void)signal(SIGALRM, SIG_DFL);
509: (void)signal(SIGQUIT, SIG_DFL);
510: (void)signal(SIGINT, SIG_DFL);
511: (void)signal(SIGTSTP, SIG_IGN);
512:
513: tbuf[0] = '-';
1.20 deraadt 514: (void)strncpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
515: p + 1 : pwd->pw_shell, sizeof tbuf - 1 - 1);
516: tbuf[sizeof tbuf - 1] = '\0';
1.1 deraadt 517:
518: if (setlogin(pwd->pw_name) < 0)
519: syslog(LOG_ERR, "setlogin() failure: %m");
520:
521: /* Discard permissions last so can't get killed and drop core. */
522: if (rootlogin)
523: (void) setuid(0);
1.15 tholo 524: else {
525: (void) seteuid(pwd->pw_uid);
1.1 deraadt 526: (void) setuid(pwd->pw_uid);
1.15 tholo 527: }
1.24 ! art 528: #ifdef KERBEROS
! 529: kgettokens(pwd->pw_dir);
! 530: #endif
1.1 deraadt 531:
532: execlp(pwd->pw_shell, tbuf, 0);
533: err(1, "%s", pwd->pw_shell);
534: }
535:
536: int
537: pwcheck(user, p, salt, passwd)
538: char *user, *p, *salt, *passwd;
539: {
540: #ifdef SKEY
1.8 millert 541: if (strcasecmp(p, "s/key") == 0)
1.7 deraadt 542: return skey_authenticate(user);
1.1 deraadt 543: #endif
544: return strcmp(crypt(p, salt), passwd);
545: }
546:
547: #if defined(KERBEROS) || defined(KERBEROS5)
548: #define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
549: #else
550: #define NBUFSIZ (UT_NAMESIZE + 1)
551: #endif
552:
553: #if defined(KERBEROS) || defined(KERBEROS5)
554: /*
555: * This routine handles cleanup stuff, and the like.
556: * It exists only in the child process.
557: */
558: #include <sys/wait.h>
559: void
560: dofork()
561: {
562: int child;
563:
564: if (!(child = fork()))
565: return; /* Child process */
566:
567: /* Setup stuff? This would be things we could do in parallel with login */
568: (void) chdir("/"); /* Let's not keep the fs busy... */
569:
570: /* If we're the parent, watch the child until it dies */
571: while (wait(0) != child)
572: ;
573:
574: /* Cleanup stuff */
575: /* Run kdestroy to destroy tickets */
576: kdestroy();
577:
578: /* Leave */
579: exit(0);
580: }
581: #endif
582:
583: void
584: getloginname()
585: {
586: int ch;
587: char *p;
588: static char nbuf[NBUFSIZ];
589:
590: for (;;) {
591: (void)printf("login: ");
592: for (p = nbuf; (ch = getchar()) != '\n'; ) {
593: if (ch == EOF) {
594: badlogin(username);
595: exit(0);
596: }
597: if (p < nbuf + (NBUFSIZ - 1))
598: *p++ = ch;
599: }
1.24 ! art 600: if (p > nbuf) {
1.1 deraadt 601: if (nbuf[0] == '-')
602: (void)fprintf(stderr,
603: "login names may not start with '-'.\n");
604: else {
605: *p = '\0';
606: username = nbuf;
607: break;
608: }
1.24 ! art 609: }
1.1 deraadt 610: }
611: }
612:
613: int
614: rootterm(ttyn)
615: char *ttyn;
616: {
617: struct ttyent *t;
618:
619: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
620: }
621:
622: jmp_buf motdinterrupt;
623:
624: void
625: motd()
626: {
627: int fd, nchars;
628: sig_t oldint;
629: char tbuf[8192];
630:
631: if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
632: return;
633: oldint = signal(SIGINT, sigint);
634: if (setjmp(motdinterrupt) == 0)
635: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
636: (void)write(fileno(stdout), tbuf, nchars);
637: (void)signal(SIGINT, oldint);
638: (void)close(fd);
639: }
640:
641: /* ARGSUSED */
642: void
643: sigint(signo)
644: int signo;
645: {
646: longjmp(motdinterrupt, 1);
647: }
648:
649: /* ARGSUSED */
650: void
651: timedout(signo)
652: int signo;
653: {
654: (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
655: exit(0);
656: }
657:
658: void
659: checknologin()
660: {
661: int fd, nchars;
662: char tbuf[8192];
663:
664: if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
665: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
666: (void)write(fileno(stdout), tbuf, nchars);
667: sleepexit(0);
668: }
669: }
670:
671: void
672: dolastlog(quiet)
673: int quiet;
674: {
675: struct lastlog ll;
676: int fd;
677:
678: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
679: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
680: if (!quiet) {
681: if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
682: ll.ll_time != 0) {
683: (void)printf("Last login: %.*s ",
684: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 685: (void)printf("on %.*s",
686: (int)sizeof(ll.ll_line),
687: ll.ll_line);
1.1 deraadt 688: if (*ll.ll_host != '\0')
1.14 millert 689: (void)printf(" from %.*s",
1.1 deraadt 690: (int)sizeof(ll.ll_host),
691: ll.ll_host);
1.14 millert 692: (void)putchar('\n');
1.1 deraadt 693: }
694: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
695: }
696: memset((void *)&ll, 0, sizeof(ll));
697: (void)time(&ll.ll_time);
698: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
699: if (hostname)
700: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
701: (void)write(fd, (char *)&ll, sizeof(ll));
702: (void)close(fd);
703: }
704: }
705:
706: void
707: badlogin(name)
708: char *name;
709: {
710: if (failures == 0)
711: return;
712: if (hostname) {
1.14 millert 713: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s%s%s",
714: failures, failures > 1 ? "S" : "",
715: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.1 deraadt 716: syslog(LOG_AUTHPRIV|LOG_NOTICE,
1.14 millert 717: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
718: failures, failures > 1 ? "S" : "",
719: rusername ? rusername : "", rusername ? "@" : "",
720: hostname, name);
1.1 deraadt 721: } else {
722: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
723: failures, failures > 1 ? "S" : "", tty);
724: syslog(LOG_AUTHPRIV|LOG_NOTICE,
725: "%d LOGIN FAILURE%s ON %s, %s",
726: failures, failures > 1 ? "S" : "", tty, name);
727: }
728: }
729:
730: #undef UNKNOWN
731: #define UNKNOWN "su"
732:
733: char *
734: stypeof(ttyid)
735: char *ttyid;
736: {
737: struct ttyent *t;
738:
739: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
740: }
741:
742: void
743: sleepexit(eval)
744: int eval;
745: {
746: (void)sleep(5);
747: exit(eval);
1.11 millert 748: }
749:
750: void
751: sighup(signum)
752: int signum;
753: {
754: if (username)
755: badlogin(username);
756:
757: exit(W_EXITCODE(0, signum));
1.1 deraadt 758: }
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