Annotation of src/usr.bin/login/login.c, Revision 1.21
1.21 ! deraadt 1: /* $OpenBSD: login.c,v 1.20 1997/04/19 21:01:12 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
1.21 ! deraadt 47: static char rcsid[] = "$OpenBSD: login.c,v 1.20 1997/04/19 21:01:12 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>
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>
1.1 deraadt 78:
79: #include "pathnames.h"
80:
81: void badlogin __P((char *));
82: void checknologin __P((void));
83: void dolastlog __P((int));
84: void getloginname __P((void));
85: void motd __P((void));
86: int rootterm __P((char *));
87: void sigint __P((int));
1.11 millert 88: void sighup __P((int));
1.1 deraadt 89: void sleepexit __P((int));
90: char *stypeof __P((char *));
91: void timedout __P((int));
92: int pwcheck __P((char *, char *, char *, char *));
93: #if defined(KERBEROS) || defined(KERBEROS5)
94: int klogin __P((struct passwd *, char *, char *, char *));
95: void kdestroy __P((void));
96: void dofork __P((void));
97: #endif
98:
99: extern void login __P((struct utmp *));
1.13 millert 100: extern int check_failedlogin __P((uid_t));
1.14 millert 101: extern void log_failedlogin __P((uid_t, char *, char *, char *));
1.1 deraadt 102:
103: #define TTYGRPNAME "tty" /* name of group to own ttys */
104:
105: /*
106: * This bounds the time given to login. Not a define so it can
107: * be patched on machines where it's too small.
108: */
109: u_int timeout = 300;
110:
111: #if defined(KERBEROS) || defined(KERBEROS5)
112: int notickets = 1;
113: char *instance;
114: char *krbtkfile_env;
115: int authok;
116: #endif
117:
118: struct passwd *pwd;
119: int failures;
1.14 millert 120: char term[64], *envinit[1], *hostname, *tty;
121: char *username = NULL, *rusername = NULL;
1.1 deraadt 122:
123: int
124: main(argc, argv)
125: int argc;
126: char *argv[];
127: {
128: extern char **environ;
129: struct group *gr;
130: struct stat st;
131: struct timeval tp;
132: struct utmp utmp;
1.14 millert 133: int ask, ch, cnt, fflag, hflag, pflag, uflag, quietlog, rootlogin, rval;
1.1 deraadt 134: uid_t uid;
135: char *domain, *p, *salt, *ttyn;
136: char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
137: char localhost[MAXHOSTNAMELEN];
138:
139: (void)signal(SIGALRM, timedout);
140: (void)alarm(timeout);
141: (void)signal(SIGQUIT, SIG_IGN);
142: (void)signal(SIGINT, SIG_IGN);
1.11 millert 143: (void)signal(SIGHUP, sighup);
1.1 deraadt 144: (void)setpriority(PRIO_PROCESS, 0, 0);
145:
146: openlog("login", LOG_ODELAY, LOG_AUTH);
147:
148: /*
149: * -p is used by getty to tell login not to destroy the environment
150: * -f is used to skip a second login authentication
151: * -h is used by other servers to pass the name of the remote
152: * host to login so that it may be placed in utmp and wtmp
153: */
154: domain = NULL;
155: if (gethostname(localhost, sizeof(localhost)) < 0)
156: syslog(LOG_ERR, "couldn't get local hostname: %m");
157: else
158: domain = strchr(localhost, '.');
1.21 ! deraadt 159: if (domain) {
! 160: domain++;
! 161: if (*domain && strchr(domain, '.') == NULL)
! 162: domain = localhost;
! 163: }
1.1 deraadt 164:
165: fflag = hflag = pflag = 0;
166: uid = getuid();
1.16 millert 167: while ((ch = getopt(argc, argv, "fh:u:p")) != -1)
1.1 deraadt 168: switch (ch) {
169: case 'f':
170: fflag = 1;
171: break;
172: case 'h':
173: if (uid)
174: errx(1, "-h option: %s", strerror(EPERM));
175: hflag = 1;
176: if (domain && (p = strchr(optarg, '.')) &&
1.21 ! deraadt 177: strcasecmp(p+1, domain) == 0)
1.1 deraadt 178: *p = 0;
179: hostname = optarg;
180: break;
181: case 'p':
182: pflag = 1;
183: break;
1.14 millert 184: case 'u':
185: if (uid)
186: errx(1, "-u option: %s", strerror(EPERM));
187: uflag = 1;
188: rusername = optarg;
189: break;
1.1 deraadt 190: case '?':
191: default:
192: if (!uid)
193: syslog(LOG_ERR, "invalid flag %c", ch);
194: (void)fprintf(stderr,
195: "usage: login [-fp] [-h hostname] [username]\n");
196: exit(1);
197: }
198: argc -= optind;
199: argv += optind;
200:
201: if (*argv) {
202: username = *argv;
203: ask = 0;
204: } else
205: ask = 1;
206:
207: for (cnt = getdtablesize(); cnt > 2; cnt--)
208: (void)close(cnt);
209:
210: ttyn = ttyname(STDIN_FILENO);
211: if (ttyn == NULL || *ttyn == '\0') {
212: (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
213: ttyn = tname;
214: }
1.12 millert 215: if ((tty = strrchr(ttyn, '/')))
1.1 deraadt 216: ++tty;
217: else
218: tty = ttyn;
219:
220: for (cnt = 0;; ask = 1) {
221: #if defined(KERBEROS) || defined(KERBEROS5)
222: kdestroy();
223: #endif
224: if (ask) {
225: fflag = 0;
226: getloginname();
227: }
228: rootlogin = 0;
1.18 flipk 229:
230: #if defined(KERBEROS) || defined(KERBEROS5)
231: /*
232: * Why should anyone with a root instance be able
233: * to be root here?
234: */
1.17 dm 235: instance = "";
1.18 flipk 236: #endif
1.1 deraadt 237: #ifdef KERBEROS
238: if ((instance = strchr(username, '.')) != NULL) {
239: if (strncmp(instance, ".root", 5) == 0)
240: rootlogin = 1;
241: *instance++ = '\0';
242: } else
243: instance = "";
244: #endif
245: #ifdef KERBEROS5
246: if ((instance = strchr(username, '/')) != NULL) {
247: if (strncmp(instance, "/root", 5) == 0)
248: rootlogin = 1;
249: *instance++ = '\0';
250: } else
251: instance = "";
252: #endif
253: if (strlen(username) > UT_NAMESIZE)
254: username[UT_NAMESIZE] = '\0';
255:
256: /*
257: * Note if trying multiple user names; log failures for
258: * previous user name, but don't bother logging one failure
259: * for nonexistent name (mistyped username).
260: */
261: if (failures && strcmp(tbuf, username)) {
262: if (failures > (pwd ? 0 : 1))
263: badlogin(tbuf);
264: failures = 0;
265: }
1.20 deraadt 266: (void)strncpy(tbuf, username, sizeof tbuf-1);
267: tbuf[sizeof tbuf-1] = '\0';
1.1 deraadt 268:
1.12 millert 269: if ((pwd = getpwnam(username)))
1.1 deraadt 270: salt = pwd->pw_passwd;
271: else
272: salt = "xx";
273:
274: /*
275: * if we have a valid account name, and it doesn't have a
276: * password, or the -f option was specified and the caller
277: * is root or the caller isn't changing their uid, don't
278: * authenticate.
279: */
280: if (pwd) {
281: if (pwd->pw_uid == 0)
282: rootlogin = 1;
283:
284: if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
285: /* already authenticated */
286: break;
287: } else if (pwd->pw_passwd[0] == '\0') {
288: /* pretend password okay */
289: rval = 0;
290: goto ttycheck;
291: }
292: }
293:
294: fflag = 0;
295:
296: (void)setpriority(PRIO_PROCESS, 0, -4);
297:
298: p = getpass("Password:");
299:
300: if (pwd) {
301: #if defined(KERBEROS) || defined(KERBEROS5)
302: rval = klogin(pwd, instance, localhost, p);
303: if (rval != 0 && rootlogin && pwd->pw_uid != 0)
304: rootlogin = 0;
305: if (rval == 0)
306: authok = 1;
307: else if (rval == 1) {
308: if (pwd->pw_uid != 0)
309: rootlogin = 0;
310: rval = pwcheck(username, p, salt, pwd->pw_passwd);
311: }
312: #else
313: rval = pwcheck(username, p, salt, pwd->pw_passwd);
314: #endif
315: }
316: memset(p, 0, strlen(p));
317:
318: (void)setpriority(PRIO_PROCESS, 0, 0);
319:
320: ttycheck:
321: /*
322: * If trying to log in as root without Kerberos,
323: * but with insecure terminal, refuse the login attempt.
324: */
325: #if defined(KERBEROS) || defined(KERBEROS5)
326: if (authok == 0)
327: #endif
328: if (pwd && !rval && rootlogin && !rootterm(tty)) {
329: (void)fprintf(stderr,
330: "%s login refused on this terminal.\n",
331: pwd->pw_name);
332: if (hostname)
333: syslog(LOG_NOTICE,
1.14 millert 334: "LOGIN %s REFUSED FROM %s%s%s ON TTY %s",
335: pwd->pw_name, rusername ? rusername : "",
336: rusername ? "@" : "", hostname, tty);
1.1 deraadt 337: else
338: syslog(LOG_NOTICE,
339: "LOGIN %s REFUSED ON TTY %s",
340: pwd->pw_name, tty);
341: continue;
342: }
343:
344: if (pwd && !rval)
345: break;
346:
347: (void)printf("Login incorrect\n");
348: failures++;
1.13 millert 349: if (pwd)
1.14 millert 350: log_failedlogin(pwd->pw_uid, hostname, rusername, tty);
1.1 deraadt 351: /* we allow 10 tries, but after 3 we start backing off */
352: if (++cnt > 3) {
353: if (cnt >= 10) {
354: badlogin(username);
355: sleepexit(1);
356: }
357: sleep((u_int)((cnt - 3) * 5));
358: }
359: }
360:
361: /* committed to login -- turn off timeout */
362: (void)alarm((u_int)0);
363:
364: endpwent();
365:
366: /* if user not super-user, check for disabled logins */
367: if (!rootlogin)
368: checknologin();
369:
1.5 deraadt 370: setegid(pwd->pw_gid);
371: seteuid(pwd->pw_uid);
372:
1.1 deraadt 373: if (chdir(pwd->pw_dir) < 0) {
374: (void)printf("No home directory %s!\n", pwd->pw_dir);
375: if (chdir("/"))
376: exit(0);
377: pwd->pw_dir = "/";
378: (void)printf("Logging in with home = \"/\".\n");
379: }
380:
1.19 downsj 381: quietlog = ((strcmp(pwd->pw_shell, "/sbin/nologin") == 0) ||
382: (access(_PATH_HUSHLOGIN, F_OK) == 0));
1.5 deraadt 383:
384: seteuid(0);
385: setegid(0); /* XXX use a saved gid instead? */
1.1 deraadt 386:
387: if (pwd->pw_change || pwd->pw_expire)
388: (void)gettimeofday(&tp, (struct timezone *)NULL);
389: if (pwd->pw_change)
390: if (tp.tv_sec >= pwd->pw_change) {
391: (void)printf("Sorry -- your password has expired.\n");
392: sleepexit(1);
393: } else if (pwd->pw_change - tp.tv_sec <
394: 2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
395: (void)printf("Warning: your password expires on %s",
396: ctime(&pwd->pw_change));
397: if (pwd->pw_expire)
398: if (tp.tv_sec >= pwd->pw_expire) {
399: (void)printf("Sorry -- your account has expired.\n");
400: sleepexit(1);
401: } else if (pwd->pw_expire - tp.tv_sec <
402: 2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
403: (void)printf("Warning: your account expires on %s",
404: ctime(&pwd->pw_expire));
405:
406: /* Nothing else left to fail -- really log in. */
1.11 millert 407: (void)signal(SIGHUP, SIG_DFL);
1.1 deraadt 408: memset((void *)&utmp, 0, sizeof(utmp));
409: (void)time(&utmp.ut_time);
410: (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
411: if (hostname)
412: (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
413: (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
414: login(&utmp);
415:
1.13 millert 416: if (!quietlog)
417: (void)check_failedlogin(pwd->pw_uid);
1.1 deraadt 418: dolastlog(quietlog);
1.6 deraadt 419:
420: login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
1.1 deraadt 421:
422: (void)chown(ttyn, pwd->pw_uid,
423: (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
424: #if defined(KERBEROS) || defined(KERBEROS5)
425: /* Fork so that we can call kdestroy */
426: if (krbtkfile_env)
427: dofork();
428: #endif
1.15 tholo 429: (void)setegid(pwd->pw_gid);
1.1 deraadt 430: (void)setgid(pwd->pw_gid);
431:
432: initgroups(username, pwd->pw_gid);
433:
434: if (*pwd->pw_shell == '\0')
435: pwd->pw_shell = _PATH_BSHELL;
436:
437: /* Destroy environment unless user has requested its preservation. */
438: if (!pflag)
439: environ = envinit;
1.9 millert 440: else {
441: char **cpp, **cpp2;
442:
443: for (cpp2 = cpp = environ; *cpp; cpp++) {
444: if (strncmp(*cpp, "LD_", 3) &&
445: strncmp(*cpp, "IFS=", 4))
446: *cpp2++ = *cpp;
447: }
448: *cpp2 = 0;
449: }
1.1 deraadt 450: (void)setenv("HOME", pwd->pw_dir, 1);
451: (void)setenv("SHELL", pwd->pw_shell, 1);
452: if (term[0] == '\0')
453: (void)strncpy(term, stypeof(tty), sizeof(term));
454: (void)setenv("TERM", term, 0);
455: (void)setenv("LOGNAME", pwd->pw_name, 1);
456: (void)setenv("USER", pwd->pw_name, 1);
457: (void)setenv("PATH", _PATH_DEFPATH, 0);
1.14 millert 458: if (hostname)
459: (void)setenv("REMOTEHOST", hostname, 1);
460: if (rusername)
461: (void)setenv("REMOTEUSER", rusername, 1);
1.1 deraadt 462: #ifdef KERBEROS
463: if (krbtkfile_env)
464: (void)setenv("KRBTKFILE", krbtkfile_env, 1);
465: #endif
466: #ifdef KERBEROS5
467: if (krbtkfile_env)
468: (void)setenv("KRB5CCNAME", krbtkfile_env, 1);
469: #endif
470:
471: /* If fflag is on, assume caller/authenticator has logged root login. */
472: if (rootlogin && fflag == 0)
473: if (hostname)
1.14 millert 474: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s%s%s",
475: username, tty, rusername ? rusername : "",
476: rusername ? "@" : "", hostname);
1.1 deraadt 477: else
478: syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
479:
480: #if defined(KERBEROS) || defined(KERBEROS5)
481: if (!quietlog && notickets == 1)
482: (void)printf("Warning: no Kerberos tickets issued.\n");
483: #endif
484:
485: if (!quietlog) {
1.2 deraadt 486: #if 0
1.1 deraadt 487: (void)printf("%s\n\t%s %s\n\n",
488: "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
489: "The Regents of the University of California. ",
490: "All rights reserved.");
1.2 deraadt 491: #endif
1.1 deraadt 492: motd();
493: (void)snprintf(tbuf,
494: sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
495: if (stat(tbuf, &st) == 0 && st.st_size != 0)
496: (void)printf("You have %smail.\n",
497: (st.st_mtime > st.st_atime) ? "new " : "");
498: }
499:
500: (void)signal(SIGALRM, SIG_DFL);
501: (void)signal(SIGQUIT, SIG_DFL);
502: (void)signal(SIGINT, SIG_DFL);
503: (void)signal(SIGTSTP, SIG_IGN);
504:
505: tbuf[0] = '-';
1.20 deraadt 506: (void)strncpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
507: p + 1 : pwd->pw_shell, sizeof tbuf - 1 - 1);
508: tbuf[sizeof tbuf - 1] = '\0';
1.1 deraadt 509:
510: if (setlogin(pwd->pw_name) < 0)
511: syslog(LOG_ERR, "setlogin() failure: %m");
512:
513: /* Discard permissions last so can't get killed and drop core. */
514: if (rootlogin)
515: (void) setuid(0);
1.15 tholo 516: else {
517: (void) seteuid(pwd->pw_uid);
1.1 deraadt 518: (void) setuid(pwd->pw_uid);
1.15 tholo 519: }
1.1 deraadt 520:
521: execlp(pwd->pw_shell, tbuf, 0);
522: err(1, "%s", pwd->pw_shell);
523: }
524:
525: int
526: pwcheck(user, p, salt, passwd)
527: char *user, *p, *salt, *passwd;
528: {
529: #ifdef SKEY
1.8 millert 530: if (strcasecmp(p, "s/key") == 0)
1.7 deraadt 531: return skey_authenticate(user);
1.1 deraadt 532: #endif
533: return strcmp(crypt(p, salt), passwd);
534: }
535:
536: #if defined(KERBEROS) || defined(KERBEROS5)
537: #define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
538: #else
539: #define NBUFSIZ (UT_NAMESIZE + 1)
540: #endif
541:
542: #if defined(KERBEROS) || defined(KERBEROS5)
543: /*
544: * This routine handles cleanup stuff, and the like.
545: * It exists only in the child process.
546: */
547: #include <sys/wait.h>
548: void
549: dofork()
550: {
551: int child;
552:
553: if (!(child = fork()))
554: return; /* Child process */
555:
556: /* Setup stuff? This would be things we could do in parallel with login */
557: (void) chdir("/"); /* Let's not keep the fs busy... */
558:
559: /* If we're the parent, watch the child until it dies */
560: while (wait(0) != child)
561: ;
562:
563: /* Cleanup stuff */
564: /* Run kdestroy to destroy tickets */
565: kdestroy();
566:
567: /* Leave */
568: exit(0);
569: }
570: #endif
571:
572: void
573: getloginname()
574: {
575: int ch;
576: char *p;
577: static char nbuf[NBUFSIZ];
578:
579: for (;;) {
580: (void)printf("login: ");
581: for (p = nbuf; (ch = getchar()) != '\n'; ) {
582: if (ch == EOF) {
583: badlogin(username);
584: exit(0);
585: }
586: if (p < nbuf + (NBUFSIZ - 1))
587: *p++ = ch;
588: }
589: if (p > nbuf)
590: if (nbuf[0] == '-')
591: (void)fprintf(stderr,
592: "login names may not start with '-'.\n");
593: else {
594: *p = '\0';
595: username = nbuf;
596: break;
597: }
598: }
599: }
600:
601: int
602: rootterm(ttyn)
603: char *ttyn;
604: {
605: struct ttyent *t;
606:
607: return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
608: }
609:
610: jmp_buf motdinterrupt;
611:
612: void
613: motd()
614: {
615: int fd, nchars;
616: sig_t oldint;
617: char tbuf[8192];
618:
619: if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
620: return;
621: oldint = signal(SIGINT, sigint);
622: if (setjmp(motdinterrupt) == 0)
623: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
624: (void)write(fileno(stdout), tbuf, nchars);
625: (void)signal(SIGINT, oldint);
626: (void)close(fd);
627: }
628:
629: /* ARGSUSED */
630: void
631: sigint(signo)
632: int signo;
633: {
634: longjmp(motdinterrupt, 1);
635: }
636:
637: /* ARGSUSED */
638: void
639: timedout(signo)
640: int signo;
641: {
642: (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
643: exit(0);
644: }
645:
646: void
647: checknologin()
648: {
649: int fd, nchars;
650: char tbuf[8192];
651:
652: if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
653: while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
654: (void)write(fileno(stdout), tbuf, nchars);
655: sleepexit(0);
656: }
657: }
658:
659: void
660: dolastlog(quiet)
661: int quiet;
662: {
663: struct lastlog ll;
664: int fd;
665:
666: if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
667: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
668: if (!quiet) {
669: if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
670: ll.ll_time != 0) {
671: (void)printf("Last login: %.*s ",
672: 24-5, (char *)ctime(&ll.ll_time));
1.14 millert 673: (void)printf("on %.*s",
674: (int)sizeof(ll.ll_line),
675: ll.ll_line);
1.1 deraadt 676: if (*ll.ll_host != '\0')
1.14 millert 677: (void)printf(" from %.*s",
1.1 deraadt 678: (int)sizeof(ll.ll_host),
679: ll.ll_host);
1.14 millert 680: (void)putchar('\n');
1.1 deraadt 681: }
682: (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
683: }
684: memset((void *)&ll, 0, sizeof(ll));
685: (void)time(&ll.ll_time);
686: (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
687: if (hostname)
688: (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
689: (void)write(fd, (char *)&ll, sizeof(ll));
690: (void)close(fd);
691: }
692: }
693:
694: void
695: badlogin(name)
696: char *name;
697: {
698: if (failures == 0)
699: return;
700: if (hostname) {
1.14 millert 701: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s%s%s",
702: failures, failures > 1 ? "S" : "",
703: rusername ? rusername : "", rusername ? "@" : "", hostname);
1.1 deraadt 704: syslog(LOG_AUTHPRIV|LOG_NOTICE,
1.14 millert 705: "%d LOGIN FAILURE%s FROM %s%s%s, %s",
706: failures, failures > 1 ? "S" : "",
707: rusername ? rusername : "", rusername ? "@" : "",
708: hostname, name);
1.1 deraadt 709: } else {
710: syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
711: failures, failures > 1 ? "S" : "", tty);
712: syslog(LOG_AUTHPRIV|LOG_NOTICE,
713: "%d LOGIN FAILURE%s ON %s, %s",
714: failures, failures > 1 ? "S" : "", tty, name);
715: }
716: }
717:
718: #undef UNKNOWN
719: #define UNKNOWN "su"
720:
721: char *
722: stypeof(ttyid)
723: char *ttyid;
724: {
725: struct ttyent *t;
726:
727: return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
728: }
729:
730: void
731: sleepexit(eval)
732: int eval;
733: {
734: (void)sleep(5);
735: exit(eval);
1.11 millert 736: }
737:
738: void
739: sighup(signum)
740: int signum;
741: {
742: if (username)
743: badlogin(username);
744:
745: exit(W_EXITCODE(0, signum));
1.1 deraadt 746: }