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 1bc2e26..c1ac218 100644 (file)
--- a/usr/src/usr.bin/login/login.c
+++ b/usr/src/usr.bin/login/login.c
@@ -1,267 +1,680 @@
-static char *sccsid = "@(#)login.c     4.6 (Berkeley) %G%";
+/*
+ * 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[] =
+"@(#) Copyright (c) 1980, 1987, 1988 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)login.c    5.41 (Berkeley) %G%";
+#endif /* not lint */
+

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

+ * login -r hostname   (for rlogind)
+ * login -h hostname   (for telnetd, etc.)
+ * login -f name       (for pre-authenticated login: datakit, xterm, etc.)

  */
 
  */
 

-#include <sys/types.h>
-#include <sgtty.h>
+#include <sys/param.h>
+#include <ufs/quota.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+

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

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

 #include <pwd.h>
 #include <pwd.h>

+#include <setjmp.h>

 #include <stdio.h>
 #include <stdio.h>

-#include <sys/stat.h>
-#include <lastlog.h>
-#include <whoami.h>
-#define SCPYN(a, b)    strncpy(a, b, sizeof(a))
-
-#define NMAX sizeof(utmp.ut_name)
-#define LMAX sizeof(utmp.ut_line)
-
-char   user[20];
-char   maildir[30] =   "/usr/spool/mail/";
-char   lastlog[] =     "/usr/adm/lastlog";
-struct passwd nouser = {"", "nope"};
-struct sgttyb ttyb;
-struct utmp utmp;
-char   minusnam[16] = "-";
-char   homedir[64] = "HOME=";
-char   shell[64] = "SHELL=";
-char   term[64] = "TERM=";
-char   *envinit[] = {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user,0};
+#include <strings.h>
+#include <tzfile.h>
+#include "pathnames.h"
+
+#define        TTYGRPNAME      "tty"           /* name of group to own ttys */
+
+/*
+ * 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;
+

 struct passwd *pwd;
 struct passwd *pwd;

+int    failures;
+char   term[64], *hostname, *username, *tty;

 
 

-struct passwd *getpwnam();
-char   *strcat();
-int    setpwent();
-char   *ttyname();
-char   *crypt();
-char   *getpass();
-char   *rindex();
-char   *stypeof();
-extern char **environ;
-
-#define        CTRL(c) ('c'&037)
-#define        CERASE  '#'
-#define        CEOT    CTRL(d)
-#define        CKILL   '@'
-#define        CQUIT   034             /* FS, cntl shift L */
-#define        CINTR   0177            /* DEL */
-#define        CSTOP   CTRL(s)
-#define        CSTART  CTRL(q)
-#define        CBRK    0377
+struct sgttyb sgttyb;

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

-       CTRL(z), CTRL(y), CTRL(r), CTRL(o), CTRL(w), CTRL(v)
+       CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT

 };
 
 };
 

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

 {
 {

-       register char *namep;
-       int t, f, c;
-       char *ttyn;
-       int ldisc = 0;
-
-       alarm(60);
-       signal(SIGQUIT, SIG_IGN);
-       signal(SIGINT, SIG_IGN);
-       nice(-100);
-       nice(20);
-       nice(0);
-       ioctl(0, TIOCLSET, 0);
-       ioctl(0, TIOCNXCL, 0);
-       gtty(0, &ttyb);
-       ttyb.sg_erase = '#';
-       ttyb.sg_kill = '@';
-       stty(0, &ttyb);
-       ioctl(0, TIOCSETC, &tc);
-       ioctl(0, TIOCSLTC, &ltc);
-       for (t=3; t<20; t++)
-               close(t);
+       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 
+        * -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
+        */
+       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);
+                       }
+                       fflag = 1;
+                       break;
+               case 'h':
+                       if (getuid()) {
+                               (void)fprintf(stderr,
+                                   "login: -h for super-user only.\n");
+                               exit(1);
+                       }
+                       if (rflag) {
+                               fprintf(stderr,
+                                   "login: only one of -r and -h allowed.\n");
+                               exit(1);
+                       }
+                       hflag = 1;
+                       if (domain && (p = index(optarg, '.')) &&
+                           strcasecmp(p, domain) == 0)
+                               *p = 0;
+                       hostname = optarg;
+                       break;
+               case 'p':
+                       pflag = 1;
+                       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);
+               }
+       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
+        * baud rate across the network.
+        */
+       if (rflag)
+               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==0)
-               ttyn = "/dev/tty??";
-
-    loop:
-       ldisc = 0;
-       ioctl(0, TIOCSETD, &ldisc);
-       SCPYN(utmp.ut_name, "");
-       if (argc>1) {
-               SCPYN(utmp.ut_name, argv[1]);
-               argc = 0;
+       if (ttyn == NULL || *ttyn == '\0') {
+               (void)sprintf(tname, "%s??", _PATH_TTY);
+               ttyn = tname;

        }
        }

-       while (utmp.ut_name[0] == '\0') {
-               namep = utmp.ut_name;
-               printf("login: ");
-               while ((c = getchar()) != '\n') {
-                       if(c == ' ')
-                               c = '_';
-                       if (c == EOF)
-                               exit(0);
-                       if (namep < utmp.ut_name+NMAX)
-                               *namep++ = c;
+       if (tty = rindex(ttyn, '/'))
+               ++tty;
+       else
+               tty = ttyn;
+
+       openlog("login", LOG_ODELAY, LOG_AUTH);
+
+       for (cnt = 0;; ask = 1) {
+               ioctlval = 0;
+               (void)ioctl(0, TIOCSETD, &ioctlval);
+
+               if (ask) {
+                       fflag = 0;
+                       getloginname();
+               }
+               /*
+                * 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 (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();
+
+               /*
+                * Disallow automatic login to root; if not invoked by
+                * root, disallow if the uid's differ.
+                */
+               if (fflag && pwd) {
+                       int uid = getuid();
+
+                       passwd_req = pwd->pw_uid == 0 ||
+                           (uid && uid != pwd->pw_uid);
+               }
+
+               /*
+                * If no pre-authentication and a password exists
+                * for this user, prompt for one and verify it.
+                */
+               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));

                }
        }
                }
        }

-       setpwent();
-       if ((pwd = getpwnam(utmp.ut_name)) == NULL)
-               pwd = &nouser;
+
+       /* committed to login -- turn off timeout */
+       (void)alarm((u_int)0);
+
+       /* paranoia... */

        endpwent();
        endpwent();

-       if (!strcmp(pwd->pw_shell, "/bin/csh")) {
-               ldisc = NTTYDISC;
-               ioctl(0, TIOCSETD, &ldisc);
+
+       /*
+        * 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
+                       syslog(LOG_NOTICE, "ROOT LOGIN REFUSED ON %s", tty);
+               (void)printf("Login incorrect\n");
+               sleepexit(1);

        }
        }

-       if (*pwd->pw_passwd != '\0') {
-               nice(-4);
-               namep = crypt(getpass("Password:"),pwd->pw_passwd);
-               nice(4);
-               if (strcmp(namep, pwd->pw_passwd)) {
-bad:
-                       printf("Login incorrect\n");
-                       if (ttyn[LMAX] == 'd') {
-                               FILE *console = fopen("/dev/console", "w");
-                               if (console != NULL) {
-                                       fprintf(console, "\r\nBADDIALUP %s %s\r\n", ttyn+5, utmp.ut_name);
-                                       fclose(console);
-                               }
-                       }
-                       goto loop;
+
+       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);

        }
        }

-       sprintf(user, "USER=%.*s", NMAX, pwd->pw_name);
-#ifdef ERNIE
-       if (pwd->pw_uid == 0 && ttyn[5] != 'c')
-               goto bad;
-#endif
-       if (ttyn[LMAX] == 'd') {
-               FILE *console = fopen("/dev/console", "w");
-               if (console != NULL) {
-                       fprintf(console, "\r\nDIALUP %s %s\r\n", ttyn+5, pwd->pw_name);
-                       fclose(console);
-               }
+
+       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");

        }
        }

-       if((f = open(lastlog, 2)) >= 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) {
-                       register char *ep = (char *) ctime(&ll.ll_time);
-                       printf("Last login: ");
-                       ep[24 - 5] = 0;
-                       printf("%s on %.*s\n", ep, LMAX, 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);
-               strcpyn(ll.ll_line, ttyn+5, LMAX);
-               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);

        }
        }

-       if(chdir(pwd->pw_dir) < 0) {
-               printf("No directory\n");
-               goto loop;
+
+       dolastlog(quietlog);
+
+       if (!hflag && !rflag) {                                 /* XXX */
+               static struct winsize win = { 0, 0, 0, 0 };
+
+               (void)ioctl(0, TIOCSWINSZ, &win);

        }
        }

-       time(&utmp.ut_time);
-       t = ttyslot();
-       if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
-               lseek(f, (long)(t*sizeof(utmp)), 0);
-               SCPYN(utmp.ut_line, rindex(ttyn, '/')+1);
-               write(f, (char *)&utmp, sizeof(utmp));
-               close(f);
+
+       (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);
+
+       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);

        }
        }

-       if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) {
-               lseek(f, 0L, 2);
-               write(f, (char *)&utmp, sizeof(utmp));
-               close(f);
+
+       /* destroy environment unless user has requested preservation */
+       if (!pflag)
+               environ = envinit;
+       (void)setenv("HOME", pwd->pw_dir, 1);
+       (void)setenv("SHELL", pwd->pw_shell, 1);
+       if (term[0] == '\0')
+               strncpy(term, stypeof(tty), sizeof(term));
+       (void)setenv("TERM", term, 0);
+       (void)setenv("USER", pwd->pw_name, 1);
+       (void)setenv("PATH", _PATH_DEFPATH, 0);
+
+       if (tty[sizeof("tty")-1] == 'd')
+               syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
+       if (pwd->pw_uid == 0)
+               if (hostname)
+                       syslog(LOG_NOTICE, "ROOT LOGIN ON %s FROM %s",
+                           tty, hostname);
+               else
+                       syslog(LOG_NOTICE, "ROOT LOGIN ON %s", tty);
+
+       if (!quietlog) {
+               struct stat st;
+
+               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 " : "");

        }
        }

-       chown(ttyn, pwd->pw_uid, pwd->pw_gid);
-       setgid(pwd->pw_gid);
-       setuid(pwd->pw_uid);
-       if (*pwd->pw_shell == '\0')
-               pwd->pw_shell = "/bin/sh";
-       environ = envinit;
-       strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
-       strncat(shell, pwd->pw_shell, sizeof(shell)-7);
-       strncat(term, stypeof(ttyn), sizeof(term)-6);
-       if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
-               namep = pwd->pw_shell;
-       else
-               namep++;
-       strcat(minusnam, namep);
-       alarm(0);
-       umask(022);
-       showmotd();
-       strcat(maildir, pwd->pw_name);
-       if(access(maildir,4)==0) {
-               struct stat statb;
-               stat(maildir, &statb);
-               if (statb.st_size)
-                       printf("You have mail.\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);
+}
+
+getloginname()
+{
+       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);
+                       }
+                       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;
+                       }

        }
        }

-       signal(SIGQUIT, SIG_DFL);
-       signal(SIGINT, SIG_DFL);
-       execlp(pwd->pw_shell, minusnam, 0);
-       printf("No shell\n");
+}
+
+timedout()
+{
+       (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;
+
+       return((t = getttynam(ttyn)) && t->ty_status&TTY_SECURE);
+}
+
+jmp_buf motdinterrupt;
+
+motd()

 {
 {

-       signal(SIGINT, SIG_IGN);
-       stopmotd++;
+       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);

 }
 
 }
 

-showmotd()
+sigint()

 {
 {

-       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);
+       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);

        }
        }

-       signal(SIGINT, SIG_IGN);

 }
 
 }
 

-#define UNKNOWN "su"
+dolastlog(quiet)
+       int quiet;
+{
+       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);
+       }
+}
+
+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
+#define        UNKNOWN "su"

 
 char *
 stypeof(ttyid)
 
 char *
 stypeof(ttyid)

-char   *ttyid;
+       char *ttyid;

 {
 {

-       static char     typebuf[16];
-       char            buf[50];
-       register FILE   *f;
-       register char   *p, *t, *q;
-
-       if (ttyid == NULL)
-               return (UNKNOWN);
-       f = fopen("/etc/ttytype", "r");
-       if (f == NULL)
-               return (UNKNOWN);
-       /* split off end of name */
-       for (p = q = ttyid; *p != 0; p++)
-               if (*p == '/')
-                       q = p + 1;
-
-       /* scan the file */
-       while (fgets(buf, sizeof buf, f) != NULL)
-       {
-               for (t=buf; *t!=' '; t++)
-                       ;
-               *t++ = 0;
-               for (p=t; *p>' '; p++)
-                       ;
-               *p = 0;
-               if (strcmp(q,t)==0) {
-                       strcpy(typebuf, buf);
-                       fclose(f);
-                       return (typebuf);
+       struct ttyent *t;
+
+       return(ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
+}
+
+getstr(buf, cnt, err)
+       char *buf, *err;
+       int cnt;
+{
+       char ch;
+
+       do {
+               if (read(0, &ch, sizeof(ch)) != sizeof(ch))
+                       exit(1);
+               if (--cnt < 0) {
+                       (void)fprintf(stderr, "%s too long\r\n", err);
+                       sleepexit(1);

                }
                }

+               *buf++ = ch;
+       } while (ch);
+}
+
+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(tp)
+       struct sgttyb *tp;
+{
+       register char *cp = index(term, '/'), **cpp;
+       char *speed;
+
+       if (cp) {
+               *cp++ = '\0';
+               speed = cp;
+               cp = index(speed, '/');
+               if (cp)
+                       *cp++ = '\0';
+               for (cpp = speeds; cpp < &speeds[NSPEEDS]; cpp++)
+                       if (strcmp(*cpp, speed) == 0) {
+                               tp->sg_ispeed = tp->sg_ospeed = cpp-speeds;
+                               break;
+                       }

        }
        }

-       fclose (f);
-       return (UNKNOWN);
+       tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;

 }
 }