add protection against masquerading Kerberos server

[unix-history] / usr / src / usr.bin / login / login.c

diff --git a/usr/src/usr.bin/login/login.c b/usr/src/usr.bin/login/login.c
index 926be83..c1ac218 100644 (file)
--- a/usr/src/usr.bin/login/login.c
+++ b/usr/src/usr.bin/login/login.c
@@ -1,18 +1,29 @@
 /*
 /*

- * Copyright (c) 1980,1987 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1980, 1987, 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

  */
 
 #ifndef lint
 char copyright[] =
  */
 
 #ifndef lint
 char copyright[] =

-"@(#) Copyright (c) 1980 Regents of the University of California.\n\
+"@(#) Copyright (c) 1980, 1987, 1988 The Regents of the University of California.\n\

  All rights reserved.\n";
  All rights reserved.\n";

-#endif not lint
+#endif /* not lint */

 
 #ifndef lint
 
 #ifndef lint

-static char sccsid[] = "@(#)login.c    5.21 (Berkeley) %G%";
-#endif not lint
+static char sccsid[] = "@(#)login.c    5.41 (Berkeley) %G%";
+#endif /* not lint */

 
 /*
  * login [ name ]
 
 /*
  * login [ name ]


@@ -22,61 +33,39 @@ static char sccsid[] = "@(#)login.c 5.21 (Berkeley) %G%";
  */
 
 #include <sys/param.h>
  */
 
 #include <sys/param.h>

-#include <sys/quota.h>
+#include <ufs/quota.h>

 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/file.h>

+#include <sys/ioctl.h>

 
 

-#include <sgtty.h>

 #include <utmp.h>
 #include <signal.h>
 #include <utmp.h>
 #include <signal.h>

-#include <pwd.h>
-#include <stdio.h>
-#include <lastlog.h>

 #include <errno.h>
 #include <ttyent.h>
 #include <syslog.h>
 #include <grp.h>
 #include <errno.h>
 #include <ttyent.h>
 #include <syslog.h>
 #include <grp.h>

+#include <pwd.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <strings.h>
+#include <tzfile.h>
+#include "pathnames.h"

 
 

-#define TTYGRPNAME     "tty"           /* name of group to own ttys */
-#define TTYGID(gid)    tty_gid(gid)    /* gid that owns all ttys */
-
-#define        SCMPN(a, b)     strncmp(a, b, sizeof(a))
-#define        SCPYN(a, b)     strncpy(a, b, sizeof(a))
-
-#define NMAX   sizeof(utmp.ut_name)
-#define HMAX   sizeof(utmp.ut_host)
-
-#define        FALSE   0
-#define        TRUE    -1
+#define        TTYGRPNAME      "tty"           /* name of group to own ttys */

 
 

-char   nolog[] =       "/etc/nologin";
-char   qlog[]  =       ".hushlogin";
-char   maildir[30] =   "/usr/spool/mail/";
-char   lastlog[] =     "/usr/adm/lastlog";
-struct passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" };
-struct sgttyb ttyb;
-struct utmp utmp;
-char   minusnam[16] = "-";
-char   *envinit[1];                    /* now set by setenv calls */

 /*
 /*

- * This bounds the time given to login.  We initialize it here
- * so it can be patched on machines where it's too small.
+ * This bounds the time given to login.  Not a define so it can
+ * be patched on machines where it's too small.

  */
 int    timeout = 300;
 
  */
 int    timeout = 300;
 

-char   term[64];
-

 struct passwd *pwd;
 struct passwd *pwd;

-char   *strcat(), *rindex(), *index();
-int    timedout();
-char   *ttyname();
-char   *crypt();
-char   *getpass();
-char   *stypeof();
-extern int errno;
+int    failures;
+char   term[64], *hostname, *username, *tty;

 
 

+struct sgttyb sgttyb;

 struct tchars tc = {
        CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
 };
 struct tchars tc = {
        CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
 };


@@ -84,469 +73,592 @@ struct    ltchars ltc = {
        CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
 };
 
        CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
 };
 

-struct winsize win = { 0, 0, 0, 0 };
+char *months[] =
+       { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+         "Sep", "Oct", "Nov", "Dec" };

 
 

-int    rflag;
-int    usererr = -1;
-char   rusername[NMAX+1], lusername[NMAX+1];
-char   rpassword[NMAX+1];
-char   name[NMAX+1];
-char   me[MAXHOSTNAMELEN];
-char   *rhost;
+char *months[] =
+       { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+         "Sep", "Oct", "Nov", "Dec" };

 
 main(argc, argv)
 
 main(argc, argv)

-       char *argv[];
+       int argc;
+       char **argv;

 {
 {

-       extern  char **environ;
-       register char *namep;
-       int pflag = 0, hflag = 0, fflag = 0, t, f, c;
-       int invalid, quietlog;
-       FILE *nlfd;
-       char *ttyn, *tty;
-       int ldisc = 0, zero = 0;
-       char *p, *domain, *index();
-
-       signal(SIGALRM, timedout);
-       alarm(timeout);
-       signal(SIGQUIT, SIG_IGN);
-       signal(SIGINT, SIG_IGN);
-       setpriority(PRIO_PROCESS, 0, 0);
-       quota(Q_SETUID, 0, 0, 0);
+       extern int errno, optind;
+       extern char *optarg, **environ;
+       struct timeval tp;
+       struct tm *ttp;
+       struct timeval tp;
+       struct tm *ttp;
+       struct group *gr;
+       register int ch;
+       register char *p;
+       int ask, fflag, hflag, pflag, rflag, cnt;
+       int quietlog, passwd_req, ioctlval, timedout();
+       char *domain, *salt, *envinit[1], *ttyn, *pp;
+       char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
+       char localhost[MAXHOSTNAMELEN];
+       char *ctime(), *ttyname(), *stypeof(), *crypt(), *getpass();
+       time_t time();
+       off_t lseek();
+
+       (void)signal(SIGALRM, timedout);
+       (void)alarm((u_int)timeout);
+       (void)signal(SIGQUIT, SIG_IGN);
+       (void)signal(SIGINT, SIG_IGN);
+       (void)setpriority(PRIO_PROCESS, 0, 0);
+       (void)quota(Q_SETUID, 0, 0, 0);
+

        /*
         * -p is used by getty to tell login not to destroy the environment
         * -r is used by rlogind to cause the autologin protocol;
         * -f is used to skip a second login authentication 
        /*
         * -p is used by getty to tell login not to destroy the environment
         * -r is used by rlogind to cause the autologin protocol;
         * -f is used to skip a second login authentication 

-        * -h is used by other servers to pass the name of the
-        * remote host to login so that it may be placed in utmp and wtmp
+        * -h is used by other servers to pass the name of the remote
+        *    host to login so that it may be placed in utmp and wtmp

         */
         */

-       (void) gethostname(me, sizeof(me));
-       domain = index(me, '.');
-       while (argc > 1) {
-               if (strcmp(argv[1], "-r") == 0) {
-                       if (rflag || hflag || fflag) {
-                               printf("Other options not allowed with -r\n");
+       domain = NULL;
+       if (gethostname(localhost, sizeof(localhost)) < 0)
+               syslog(LOG_ERR, "couldn't get local hostname: %m");
+       else
+               domain = index(localhost, '.');
+
+       fflag = hflag = pflag = rflag = 0;
+       passwd_req = 1;
+       while ((ch = getopt(argc, argv, "fh:pr:")) != EOF)
+               switch (ch) {
+               case 'f':
+                       if (rflag) {
+                               fprintf(stderr,
+                                   "login: only one of -r and -f allowed.\n");

                                exit(1);
                        }
                                exit(1);
                        }

-                       if (argv[2] == 0)
+                       fflag = 1;
+                       break;
+               case 'h':
+                       if (getuid()) {
+                               (void)fprintf(stderr,
+                                   "login: -h for super-user only.\n");

                                exit(1);
                                exit(1);

-                       rflag = 1;
-                       usererr = doremotelogin(argv[2]);
-                       if ((p = index(argv[2], '.')) && strcmp(p, domain) == 0)
-                               *p = 0;
-                       SCPYN(utmp.ut_host, argv[2]);
-                       argc -= 2;
-                       argv += 2;
-                       continue;
-               }
-               if (strcmp(argv[1], "-h") == 0) {
-                       if (getuid() == 0) {
-                               if (rflag || hflag) {
-                                   printf("Only one of -r and -h allowed\n");
-                                   exit(1);
-                               }
-                               hflag = 1;
-                               if ((p = index(argv[2], '.')) &&
-                                   strcmp(p, domain) == 0)
-                                       *p = 0;
-                               SCPYN(utmp.ut_host, argv[2]);

                        }
                        }

-                       argc -= 2;
-                       argv += 2;
-                       continue;
-               }
-               if (strcmp(argv[1], "-f") == 0 && argc > 2) {

                        if (rflag) {
                        if (rflag) {

-                               printf("Only one of -r and -f allowed\n");
+                               fprintf(stderr,
+                                   "login: only one of -r and -h allowed.\n");

                                exit(1);
                        }
                                exit(1);
                        }

-                       fflag = 1;
-                       SCPYN(utmp.ut_name, argv[2]);
-                       argc -= 2;
-                       argv += 2;
-                       continue;
-               }
-               if (strcmp(argv[1], "-p") == 0) {
-                       argc--;
-                       argv++;
+                       hflag = 1;
+                       if (domain && (p = index(optarg, '.')) &&
+                           strcasecmp(p, domain) == 0)
+                               *p = 0;
+                       hostname = optarg;
+                       break;
+               case 'p':

                        pflag = 1;
                        pflag = 1;

-                       continue;
+                       break;
+               case 'r':
+                       if (hflag || fflag) {
+                               fprintf(stderr,
+                                   "login: -f and -h not allowed with -r.\n");
+                               exit(1);
+                       }
+                       if (getuid()) {
+                               fprintf(stderr,
+                                   "login: -r for super-user only.\n");
+                               exit(1);
+                       }
+                       /* "-r hostname" must be last args */
+                       if (optind != argc) {
+                               fprintf(stderr, "Syntax error.\n");
+                               exit(1);
+                       }
+                       rflag = 1;
+                       passwd_req = (doremotelogin(optarg) == -1);
+                       if (domain && (p = index(optarg, '.')) &&
+                           !strcmp(p, domain))
+                               *p = '\0';
+                       hostname = optarg;
+                       break;
+               case '?':
+               default:
+                       (void)fprintf(stderr,
+                           "usage: login [-fp] [username]\n");
+                       exit(1);

                }
                }

-               break;
-       }
-       ioctl(0, TIOCLSET, &zero);
-       ioctl(0, TIOCNXCL, 0);
-       ioctl(0, FIONBIO, &zero);
-       ioctl(0, FIOASYNC, &zero);
-       ioctl(0, TIOCGETP, &ttyb);
+       argc -= optind;
+       argv += optind;
+       if (*argv) {
+               username = *argv;
+               ask = 0;
+       } else
+               ask = 1;
+       if (rflag)
+               ask = 0;
+
+       ioctlval = 0;
+       (void)ioctl(0, TIOCLSET, &ioctlval);
+       (void)ioctl(0, TIOCNXCL, 0);
+       (void)fcntl(0, F_SETFL, ioctlval);
+       (void)ioctl(0, TIOCGETP, &sgttyb);
+

        /*
        /*

-        * If talking to an rlogin process,
-        * propagate the terminal type and
+        * If talking to an rlogin process, propagate the terminal type and

         * baud rate across the network.
         */
        if (rflag)
         * baud rate across the network.
         */
        if (rflag)

-               doremoteterm(term, &ttyb);
-       ttyb.sg_erase = CERASE;
-       ttyb.sg_kill = CKILL;
-       ioctl(0, TIOCSLTC, &ltc);
-       ioctl(0, TIOCSETC, &tc);
-       ioctl(0, TIOCSETP, &ttyb);
-       for (t = getdtablesize(); t > 2; t--)
-               close(t);
+               doremoteterm(&sgttyb);
+       sgttyb.sg_erase = CERASE;
+       sgttyb.sg_kill = CKILL;
+       (void)ioctl(0, TIOCSLTC, &ltc);
+       (void)ioctl(0, TIOCSETC, &tc);
+       (void)ioctl(0, TIOCSETP, &sgttyb);
+
+       for (cnt = getdtablesize(); cnt > 2; cnt--)
+               close(cnt);
+

        ttyn = ttyname(0);
        ttyn = ttyname(0);

-       if (ttyn == (char *)0 || *ttyn == '\0')
-               ttyn = "/dev/tty??";
-       tty = rindex(ttyn, '/');
-       if (tty == NULL)
-               tty = ttyn;
+       if (ttyn == NULL || *ttyn == '\0') {
+               (void)sprintf(tname, "%s??", _PATH_TTY);
+               ttyn = tname;
+       }
+       if (tty = rindex(ttyn, '/'))
+               ++tty;

        else
        else

-               tty++;
+               tty = ttyn;
+

        openlog("login", LOG_ODELAY, LOG_AUTH);
        openlog("login", LOG_ODELAY, LOG_AUTH);

-       t = 0;
-       invalid = FALSE;
-       do {
-               ldisc = 0;
-               ioctl(0, TIOCSETD, &ldisc);
-               if (fflag == 0)
-                       SCPYN(utmp.ut_name, "");
-               /*
-                * Name specified, take it.
-                */
-               if (argc > 1) {
-                       SCPYN(utmp.ut_name, argv[1]);
-                       argc = 0;
-               }
-               /*
-                * If remote login take given name,
-                * otherwise prompt user for something.
-                */
-               if (rflag && !invalid)
-                       SCPYN(utmp.ut_name, lusername);
-               else {
-                       getloginname(&utmp);
-                       if (utmp.ut_name[0] == '-') {
-                               puts("login names may not start with '-'.");
-                               invalid = TRUE;
-                               continue;
-                       }
-               }
-               invalid = FALSE;
-               if (!strcmp(pwd->pw_shell, "/bin/csh")) {
-                       ldisc = NTTYDISC;
-                       ioctl(0, TIOCSETD, &ldisc);
-               }
-               if (fflag) {
-                       int uid = getuid();

 
 

-                       if (uid != 0 && uid != pwd->pw_uid)
-                               fflag = 0;
-                       /*
-                        * Disallow automatic login for root.
-                        */
-                       if (pwd->pw_uid == 0)
-                               fflag = 0;
+       for (cnt = 0;; ask = 1) {
+               ioctlval = 0;
+               (void)ioctl(0, TIOCSETD, &ioctlval);
+
+               if (ask) {
+                       fflag = 0;
+                       getloginname();

                }
                /*
                }
                /*

-                * If no remote login authentication and
-                * a password exists for this user, prompt
-                * for one and verify it.
+                * Note if trying multiple user names;
+                * log failures for previous user name,
+                * but don't bother logging one failure
+                * for nonexistent name (mistyped username).

                 */
                 */

-               if (usererr == -1 && fflag == 0 && *pwd->pw_passwd != '\0') {
-                       char *pp;
-
-                       setpriority(PRIO_PROCESS, 0, -4);
-                       pp = getpass("Password:");
-                       namep = crypt(pp, pwd->pw_passwd);
-                       setpriority(PRIO_PROCESS, 0, 0);
-                       if (strcmp(namep, pwd->pw_passwd))
-                               invalid = TRUE;
+               if (failures && strcmp(tbuf, username)) {
+                       if (failures > (pwd ? 0 : 1))
+                               badlogin(tbuf);
+                       failures = 0;

                }
                }

+               (void)strcpy(tbuf, username);
+               if (pwd = getpwnam(username))
+                       salt = pwd->pw_passwd;
+               else
+                       salt = "xx";
+
+               /* if user not super-user, check for disabled logins */
+               if (pwd == NULL || pwd->pw_uid)
+                       checknologin();
+

                /*
                /*

-                * If user not super-user, check for logins disabled.
+                * Disallow automatic login to root; if not invoked by
+                * root, disallow if the uid's differ.

                 */
                 */

-               if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
-                       while ((c = getc(nlfd)) != EOF)
-                               putchar(c);
-                       fflush(stdout);
-                       sleep(5);
-                       exit(0);
+               if (fflag && pwd) {
+                       int uid = getuid();
+
+                       passwd_req = pwd->pw_uid == 0 ||
+                           (uid && uid != pwd->pw_uid);

                }
                }

+

                /*
                /*

-                * If valid so far and root is logging in,
-                * see if root logins on this terminal are permitted.
+                * If no pre-authentication and a password exists
+                * for this user, prompt for one and verify it.

                 */
                 */

-               if (!invalid && pwd->pw_uid == 0 && !rootterm(tty)) {
-                       if (utmp.ut_host[0])
-                               syslog(LOG_CRIT,
-                                   "ROOT LOGIN REFUSED ON %s FROM %.*s",
-                                   tty, HMAX, utmp.ut_host);
-                       else
-                               syslog(LOG_CRIT,
-                                   "ROOT LOGIN REFUSED ON %s", tty);
-                       invalid = TRUE;
-               }
-               if (invalid) {
-                       printf("Login incorrect\n");
-                       if (++t >= 5) {
-                               if (utmp.ut_host[0])
-                                       syslog(LOG_ERR,
-                           "REPEATED LOGIN FAILURES ON %s FROM %.*s, %.*s",
-                                           tty, HMAX, utmp.ut_host,
-                                           NMAX, utmp.ut_name);
-                               else
-                                       syslog(LOG_ERR,
-                                   "REPEATED LOGIN FAILURES ON %s, %.*s",
-                                               tty, NMAX, utmp.ut_name);
-                               ioctl(0, TIOCHPCL, (struct sgttyb *) 0);
-                               close(0), close(1), close(2);
-                               sleep(10);
-                               exit(1);
+               if (!passwd_req || (pwd && !*pwd->pw_passwd))
+                       break;
+
+               setpriority(PRIO_PROCESS, 0, -4);
+               pp = getpass("Password:");
+               p = crypt(pp, salt);
+               setpriority(PRIO_PROCESS, 0, 0);
+
+               (void) bzero(pp, strlen(pp));
+               if (pwd && !strcmp(p, pwd->pw_passwd))
+                       break;
+
+               (void)printf("Login incorrect\n");
+               failures++;
+               /* we allow 10 tries, but after 3 we start backing off */
+               if (++cnt > 3) {
+                       if (cnt >= 10) {
+                               badlogin(username);
+                               (void)ioctl(0, TIOCHPCL, (struct sgttyb *)NULL);
+                               sleepexit(1);

                        }
                        }

+                       sleep((u_int)((cnt - 3) * 5));

                }
                }

-               if (*pwd->pw_shell == '\0')
-                       pwd->pw_shell = "/bin/sh";
-               if (chdir(pwd->pw_dir) < 0 && !invalid ) {
-                       if (chdir("/") < 0) {
-                               printf("No directory!\n");
-                               invalid = TRUE;
-                       } else {
-                               printf("No directory! %s\n",
-                                  "Logging in with home=/");
-                               pwd->pw_dir = "/";
-                       }
-               }
-               /*
-                * Remote login invalid must have been because
-                * of a restriction of some sort, no extra chances.
-                */
-               if (!usererr && invalid)
-                       exit(1);
-       } while (invalid);
-/* committed to login turn off timeout */
-       alarm(0);
+       }

 
 

-       if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0 && errno != EINVAL) {
-               if (errno == EUSERS)
-                       printf("%s.\n%s.\n",
-                          "Too many users logged on already",
-                          "Try again later");
-               else if (errno == EPROCLIM)
-                       printf("You have too many processes running.\n");
+       /* committed to login -- turn off timeout */
+       (void)alarm((u_int)0);
+
+       /* paranoia... */
+       endpwent();
+
+       /*
+        * If valid so far and root is logging in, see if root logins on
+        * this terminal are permitted.
+        */
+       if (pwd->pw_uid == 0 && !rootterm(tty)) {
+               if (hostname)
+                       syslog(LOG_NOTICE, "ROOT LOGIN REFUSED FROM %s",
+                           hostname);

                else
                else

-                       perror("quota (Q_SETUID)");
-               sleep(5);
-               exit(0);
+                       syslog(LOG_NOTICE, "ROOT LOGIN REFUSED ON %s", tty);
+               (void)printf("Login incorrect\n");
+               sleepexit(1);

        }
        }

-       time(&utmp.ut_time);
-       t = ttyslot();
-       if (t > 0 && (f = open("/etc/utmp", O_WRONLY)) >= 0) {
-               lseek(f, (long)(t*sizeof(utmp)), 0);
-               SCPYN(utmp.ut_line, tty);
-               write(f, (char *)&utmp, sizeof(utmp));
-               close(f);
+
+       if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0 && errno != EINVAL) {
+               switch(errno) {
+               case EUSERS:
+                       (void)fprintf(stderr,
+               "Too many users logged on already.\nTry again later.\n");
+                       break;
+               case EPROCLIM:
+                       (void)fprintf(stderr,
+                           "You have too many processes running.\n");
+                       break;
+               default:
+                       perror("quota (Q_SETUID)");
+               }
+               sleepexit(0);

        }
        }

-       if ((f = open("/usr/adm/wtmp", O_WRONLY|O_APPEND)) >= 0) {
-               write(f, (char *)&utmp, sizeof(utmp));
-               close(f);
+
+       if (chdir(pwd->pw_dir) < 0) {
+               (void)printf("No directory %s!\n", pwd->pw_dir);
+               if (chdir("/"))
+                       exit(0);
+               pwd->pw_dir = "/";
+               (void)printf("Logging in with home = \"/\".\n");

        }
        }

-       quietlog = access(qlog, F_OK) == 0;
-       if ((f = open(lastlog, O_RDWR)) >= 0) {
-               struct lastlog ll;
-
-               lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
-               if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
-                   ll.ll_time != 0 && !quietlog) {
-                       printf("Last login: %.*s ",
-                           24-5, (char *)ctime(&ll.ll_time));
-                       if (*ll.ll_host != '\0')
-                               printf("from %.*s\n",
-                                   sizeof (ll.ll_host), ll.ll_host);
-                       else
-                               printf("on %.*s\n",
-                                   sizeof (ll.ll_line), ll.ll_line);
+
+#define        TWOWEEKS        (14*24*60*60)
+       if (pwd->pw_change || pwd->pw_expire)
+               (void)gettimeofday(&tp, (struct timezone *)NULL);
+       if (pwd->pw_change)
+               if (tp.tv_sec >= pwd->pw_change) {
+                       printf("Sorry -- your password has expired.\n");
+                       sleepexit(1);
+               }
+               else if (tp.tv_sec - pwd->pw_change < TWOWEEKS) {
+                       ttp = localtime(&pwd->pw_change);
+                       printf("Warning: your password expires on %s %d, 19%d\n",
+                           months[ttp->tm_mon], ttp->tm_mday, ttp->tm_year);
+               }
+       if (pwd->pw_expire)
+               if (tp.tv_sec >= pwd->pw_expire) {
+                       printf("Sorry -- your account has expired.\n");
+                       sleepexit(1);
+               }
+               else if (tp.tv_sec - pwd->pw_expire < TWOWEEKS) {
+                       ttp = localtime(&pwd->pw_expire);
+                       printf("Warning: your account expires on %s %d, 19%d\n",
+                           months[ttp->tm_mon], ttp->tm_mday, ttp->tm_year);
+               }
+
+#define        TWOWEEKS        (14*24*60*60)
+       if (pwd->pw_change || pwd->pw_expire)
+               (void)gettimeofday(&tp, (struct timezone *)NULL);
+       if (pwd->pw_change)
+               if (tp.tv_sec >= pwd->pw_change) {
+                       (void)printf("Sorry -- your password has expired.\n");
+                       sleepexit(1);
+               }
+               else if (tp.tv_sec - pwd->pw_change < TWOWEEKS && !quietlog) {
+                       ttp = localtime(&pwd->pw_change);
+                       (void)printf("Warning: your password expires on %s %d, %d\n",
+                           months[ttp->tm_mon], ttp->tm_mday, TM_YEAR_BASE + ttp->tm_year);
+               }
+       if (pwd->pw_expire)
+               if (tp.tv_sec >= pwd->pw_expire) {
+                       (void)printf("Sorry -- your account has expired.\n");
+                       sleepexit(1);

                }
                }

-               lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
-               time(&ll.ll_time);
-               SCPYN(ll.ll_line, tty);
-               SCPYN(ll.ll_host, utmp.ut_host);
-               write(f, (char *) &ll, sizeof ll);
-               close(f);
+               else if (tp.tv_sec - pwd->pw_expire < TWOWEEKS && !quietlog) {
+                       ttp = localtime(&pwd->pw_expire);
+                       (void)printf("Warning: your account expires on %s %d, %d\n",
+                           months[ttp->tm_mon], ttp->tm_mday, TM_YEAR_BASE + ttp->tm_year);
+               }
+
+       /* nothing else left to fail -- really log in */
+       {
+               struct utmp utmp;
+
+               bzero((char *)&utmp, sizeof(utmp));
+               (void)time(&utmp.ut_time);
+               strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
+               if (hostname)
+                       strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
+               strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
+               login(&utmp);

        }
        }

-       chown(ttyn, pwd->pw_uid, TTYGID(pwd->pw_gid));
-       if (!hflag && !rflag)                                   /* XXX */
-               ioctl(0, TIOCSWINSZ, &win);
-       chmod(ttyn, 0620);
-       setgid(pwd->pw_gid);
-       strncpy(name, utmp.ut_name, NMAX);
-       name[NMAX] = '\0';
-       initgroups(name, pwd->pw_gid);
+
+       dolastlog(quietlog);
+
+       if (!hflag && !rflag) {                                 /* XXX */
+               static struct winsize win = { 0, 0, 0, 0 };
+
+               (void)ioctl(0, TIOCSWINSZ, &win);
+       }
+
+       (void)chown(ttyn, pwd->pw_uid,
+           (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
+       (void)chmod(ttyn, 0620);
+       (void)setgid(pwd->pw_gid);
+
+       initgroups(username, pwd->pw_gid);
+

        quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
        quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);

-       setuid(pwd->pw_uid);

 
 

-       /* destroy environment unless user has asked to preserve it */
+       if (*pwd->pw_shell == '\0')
+               pwd->pw_shell = _PATH_BSHELL;
+       /* turn on new line discipline for the csh */
+       else if (!strcmp(pwd->pw_shell, _PATH_CSHELL)) {
+               ioctlval = NTTYDISC;
+               (void)ioctl(0, TIOCSETD, &ioctlval);
+       }
+
+       /* destroy environment unless user has requested preservation */

        if (!pflag)
                environ = envinit;
        if (!pflag)
                environ = envinit;

-       setenv("HOME", pwd->pw_dir, 1);
-       setenv("SHELL", pwd->pw_shell, 1);
+       (void)setenv("HOME", pwd->pw_dir, 1);
+       (void)setenv("SHELL", pwd->pw_shell, 1);

        if (term[0] == '\0')
                strncpy(term, stypeof(tty), sizeof(term));
        if (term[0] == '\0')
                strncpy(term, stypeof(tty), sizeof(term));

-       setenv("TERM", term, 0);
-       setenv("USER", pwd->pw_name, 1);
-       setenv("PATH", ":/usr/ucb:/bin:/usr/bin", 0);
+       (void)setenv("TERM", term, 0);
+       (void)setenv("USER", pwd->pw_name, 1);
+       (void)setenv("PATH", _PATH_DEFPATH, 0);

 
 

-       if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
-               namep = pwd->pw_shell;
-       else
-               namep++;
-       strcat(minusnam, namep);

        if (tty[sizeof("tty")-1] == 'd')
                syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
        if (pwd->pw_uid == 0)
        if (tty[sizeof("tty")-1] == 'd')
                syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
        if (pwd->pw_uid == 0)

-               if (utmp.ut_host[0])
-                       syslog(LOG_NOTICE, "ROOT LOGIN %s FROM %.*s",
-                           tty, HMAX, utmp.ut_host);
+               if (hostname)
+                       syslog(LOG_NOTICE, "ROOT LOGIN ON %s FROM %s",
+                           tty, hostname);

                else
                else

-                       syslog(LOG_NOTICE, "ROOT LOGIN %s", tty);
+                       syslog(LOG_NOTICE, "ROOT LOGIN ON %s", tty);
+

        if (!quietlog) {
                struct stat st;
 
        if (!quietlog) {
                struct stat st;
 

-               showmotd();
-               strcat(maildir, pwd->pw_name);
-               if (stat(maildir, &st) == 0 && st.st_size != 0)
-                       printf("You have %smail.\n",
-                               (st.st_mtime > st.st_atime) ? "new " : "");
+               motd();
+               (void)sprintf(tbuf, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
+               if (stat(tbuf, &st) == 0 && st.st_size != 0)
+                       (void)printf("You have %smail.\n",
+                           (st.st_mtime > st.st_atime) ? "new " : "");

        }
        }

-       signal(SIGALRM, SIG_DFL);
-       signal(SIGQUIT, SIG_DFL);
-       signal(SIGINT, SIG_DFL);
-       signal(SIGTSTP, SIG_IGN);
-       execlp(pwd->pw_shell, minusnam, 0);
-       perror(pwd->pw_shell);
-       printf("No shell\n");
+
+       (void)signal(SIGALRM, SIG_DFL);
+       (void)signal(SIGQUIT, SIG_DFL);
+       (void)signal(SIGINT, SIG_DFL);
+       (void)signal(SIGTSTP, SIG_IGN);
+
+       tbuf[0] = '-';
+       strcpy(tbuf + 1, (p = rindex(pwd->pw_shell, '/')) ?
+           p + 1 : pwd->pw_shell);
+
+       if (setlogname(pwd->pw_name, strlen(pwd->pw_name)) < 0)
+               syslog(LOG_ERR, "setlogname() failure: %m");
+
+       /* discard permissions last so can't get killed and drop core */
+       (void)setuid(pwd->pw_uid);
+
+       execlp(pwd->pw_shell, tbuf, 0);
+       (void)fprintf(stderr, "login: no shell: %s.\n", strerror(errno));

        exit(0);
 }
 
        exit(0);
 }
 

-getloginname(up)
-       register struct utmp *up;
+getloginname()

 {
 {

-       register char *namep;
-       char c;
-
-       while (up->ut_name[0] == '\0') {
-               namep = up->ut_name;
-               printf("login: ");
-               while ((c = getchar()) != '\n') {
-                       if (c == ' ')
-                               c = '_';
-                       if (c == EOF)
+       register int ch;
+       register char *p;
+       static char nbuf[UT_NAMESIZE + 1];
+
+       for (;;) {
+               (void)printf("login: ");
+               for (p = nbuf; (ch = getchar()) != '\n'; ) {
+                       if (ch == EOF) {
+                               badlogin(username);

                                exit(0);
                                exit(0);

-                       if (namep < up->ut_name+NMAX)
-                               *namep++ = c;
+                       }
+                       if (p < nbuf + UT_NAMESIZE)
+                               *p++ = ch;

                }
                }

+               if (p > nbuf)
+                       if (nbuf[0] == '-')
+                               (void)fprintf(stderr,
+                                   "login names may not start with '-'.\n");
+                       else {
+                               *p = '\0';
+                               username = nbuf;
+                               break;
+                       }

        }
        }

-       strncpy(lusername, up->ut_name, NMAX);
-       lusername[NMAX] = 0;
-       if ((pwd = getpwnam(lusername)) == NULL)
-               pwd = &nouser;

 }
 
 timedout()
 {
 }
 
 timedout()
 {

-
-       printf("Login timed out after %d seconds\n", timeout);
+       (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);

        exit(0);
 }
 
        exit(0);
 }
 

-int    stopmotd;
-catch()
+rootterm(ttyn)
+       char *ttyn;

 {
 {

+       struct ttyent *t;

 
 

-       signal(SIGINT, SIG_IGN);
-       stopmotd++;
+       return((t = getttynam(ttyn)) && t->ty_status&TTY_SECURE);

 }
 
 }
 

-rootterm(tty)
-       char *tty;
+jmp_buf motdinterrupt;
+
+motd()

 {
 {

-       register struct ttyent *t;
+       register int fd, nchars;
+       int (*oldint)(), sigint();
+       char tbuf[8192];
+
+       if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
+               return;
+       oldint = signal(SIGINT, sigint);
+       if (setjmp(motdinterrupt) == 0)
+               while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
+                       (void)write(fileno(stdout), tbuf, nchars);
+       (void)signal(SIGINT, oldint);
+       (void)close(fd);
+}

 
 

-       if ((t = getttynam(tty)) != NULL) {
-               if (t->ty_status & TTY_SECURE)
-                       return (1);
+sigint()
+{
+       longjmp(motdinterrupt, 1);
+}
+
+checknologin()
+{
+       register int fd, nchars;
+       char tbuf[8192];
+
+       if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
+               while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
+                       (void)write(fileno(stdout), tbuf, nchars);
+               sleepexit(0);

        }
        }

-       return (0);

 }
 
 }
 

-showmotd()
+dolastlog(quiet)
+       int quiet;

 {
 {

-       FILE *mf;
-       register c;
-
-       signal(SIGINT, catch);
-       if ((mf = fopen("/etc/motd", "r")) != NULL) {
-               while ((c = getc(mf)) != EOF && stopmotd == 0)
-                       putchar(c);
-               fclose(mf);
+       struct lastlog ll;
+       int fd;
+       char *ctime();
+       char *ctime();
+
+       if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
+               (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
+               if (!quiet) {
+                       if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
+                           ll.ll_time != 0) {
+                               (void)printf("Last login: %.*s ",
+                                   24-5, (char *)ctime(&ll.ll_time));
+                               if (*ll.ll_host != '\0')
+                                       (void)printf("from %.*s\n",
+                                           sizeof(ll.ll_host), ll.ll_host);
+                               else
+                                       (void)printf("on %.*s\n",
+                                           sizeof(ll.ll_line), ll.ll_line);
+                       }
+                       (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
+               }
+               bzero((char *)&ll, sizeof(ll));
+               (void)time(&ll.ll_time);
+               strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
+               if (hostname)
+                       strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
+               (void)write(fd, (char *)&ll, sizeof(ll));
+               (void)close(fd);

        }
        }

-       signal(SIGINT, SIG_IGN);
+}
+
+badlogin(name)
+       char *name;
+{
+       if (failures == 0)
+               return;
+       if (hostname)
+               syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s, %s",
+                   failures, failures > 1 ? "S" : "", hostname, name);
+       else
+               syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s, %s",
+                   failures, failures > 1 ? "S" : "", tty, name);

 }
 
 #undef UNKNOWN
 }
 
 #undef UNKNOWN

-#define UNKNOWN "su"
+#define        UNKNOWN "su"

 
 char *
 stypeof(ttyid)
        char *ttyid;
 {
 
 char *
 stypeof(ttyid)
        char *ttyid;
 {

-       register struct ttyent *t;
+       struct ttyent *t;

 
 

-       if (ttyid == NULL || (t = getttynam(ttyid)) == NULL)
-               return (UNKNOWN);
-       return (t->ty_type);
-}
-
-doremotelogin(host)
-       char *host;
-{
-       getstr(rusername, sizeof (rusername), "remuser");
-       getstr(lusername, sizeof (lusername), "locuser");
-       getstr(term, sizeof(term), "Terminal type");
-       if (getuid()) {
-               pwd = &nouser;
-               return(-1);
-       }
-       pwd = getpwnam(lusername);
-       if (pwd == NULL) {
-               pwd = &nouser;
-               return(-1);
-       }
-       return(ruserok(host, (pwd->pw_uid == 0), rusername, lusername));
+       return(ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);

 }
 
 getstr(buf, cnt, err)
 }
 
 getstr(buf, cnt, err)

-       char *buf;
+       char *buf, *err;

        int cnt;
        int cnt;

-       char *err;

 {
 {

-       char c;
+       char ch;

 
        do {
 
        do {

-               if (read(0, &c, 1) != 1)
+               if (read(0, &ch, sizeof(ch)) != sizeof(ch))

                        exit(1);
                if (--cnt < 0) {
                        exit(1);
                if (--cnt < 0) {

-                       printf("%s too long\r\n", err);
-                       exit(1);
+                       (void)fprintf(stderr, "%s too long\r\n", err);
+                       sleepexit(1);

                }
                }

-               *buf++ = c;
-       } while (c != 0);
+               *buf++ = ch;
+       } while (ch);

 }
 
 }
 

-char   *speeds[] =
-    { "0", "50", "75", "110", "134", "150", "200", "300",
-      "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
-#define        NSPEEDS (sizeof (speeds) / sizeof (speeds[0]))
+sleepexit(eval)
+       int eval;
+{
+       sleep((u_int)5);
+       exit(eval);
+}
+
+doremotelogin(host)
+       char *host;
+{
+       static char lusername[UT_NAMESIZE+1];
+       char rusername[UT_NAMESIZE+1];
+
+       getstr(rusername, sizeof(rusername), "remuser");
+       getstr(lusername, sizeof(lusername), "locuser");
+       getstr(term, sizeof(term), "Terminal type");
+       username = lusername;
+       pwd = getpwnam(username);
+       if (pwd == NULL)
+               return(-1);
+       return(ruserok(host, (pwd->pw_uid == 0), rusername, username));
+}
+
+char *speeds[] = {
+       "0", "50", "75", "110", "134", "150", "200", "300", "600",
+       "1200", "1800", "2400", "4800", "9600", "19200", "38400",
+};
+#define        NSPEEDS (sizeof(speeds) / sizeof(speeds[0]))

 
 

-doremoteterm(term, tp)
-       char *term;
+doremoteterm(tp)

        struct sgttyb *tp;
 {
        register char *cp = index(term, '/'), **cpp;
        struct sgttyb *tp;
 {
        register char *cp = index(term, '/'), **cpp;


@@ -566,18 +678,3 @@ doremoteterm(term, tp)
        }
        tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
 }
        }
        tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
 }

-
-tty_gid(default_gid)
-       int default_gid;
-{
-       struct group *getgrnam(), *gr;
-       int gid = default_gid;
-
-       gr = getgrnam(TTYGRPNAME);
-       if (gr != (struct group *) 0)
-               gid = gr->gr_gid;
-
-       endgrent();
-
-       return (gid);
-}