BSD 4_4_Lite1 release

[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 00c244b..ef75733 100644 (file)
--- a/usr/src/usr.bin/login/login.c
+++ b/usr/src/usr.bin/login/login.c
@@ -1,570 +1,594 @@
-/*
- * Copyright (c) 1980 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, 1991, 1993, 1994
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.

  */
 
 #ifndef lint
  */
 
 #ifndef lint

-char copyright[] =
-"@(#) Copyright (c) 1980 Regents of the University of California.\n\
- All rights reserved.\n";
-#endif not lint
+static char copyright[] =
+"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
+       The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */

 
 #ifndef lint
 
 #ifndef lint

-static char sccsid[] = "@(#)login.c    5.3 (Berkeley) %G%";
-#endif not lint
+static char sccsid[] = "@(#)login.c    8.4 (Berkeley) 4/2/94";
+#endif /* not lint */

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

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

  */
 
 #include <sys/param.h>
  */
 
 #include <sys/param.h>

-#include <sys/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 <sgtty.h>
-#include <utmp.h>
-#include <signal.h>
+#include <err.h>
+#include <errno.h>
+#include <grp.h>

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

+#include <setjmp.h>
+#include <signal.h>

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

-#include <lastlog.h>
-#include <errno.h>
-#include <ttyent.h>
+#include <stdlib.h>
+#include <string.h>

 #include <syslog.h>
 #include <syslog.h>

+#include <ttyent.h>
+#include <tzfile.h>
+#include <unistd.h>
+#include <utmp.h>

 
 

-#define        SCMPN(a, b)     strncmp(a, b, sizeof(a))
-#define        SCPYN(a, b)     strncpy(a, b, sizeof(a))
+#include "pathnames.h"

 
 

-#define NMAX   sizeof(utmp.ut_name)
+void    badlogin __P((char *));
+void    checknologin __P((void));
+void    dolastlog __P((int));
+void    getloginname __P((void));
+void    motd __P((void));
+int     rootterm __P((char *));
+void    sigint __P((int));
+void    sleepexit __P((int));
+char   *stypeof __P((char *));
+void    timedout __P((int));
+#ifdef KERBEROS
+int     klogin __P((struct passwd *, char *, char *, char *));
+#endif

 
 

-#define        FALSE   0
-#define        TRUE    -1
+extern void login __P((struct utmp *));
+
+#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[] = { 0 };             /* 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 = 60;
+u_int  timeout = 300;

 
 

-char   term[64];
+#ifdef KERBEROS
+int    notickets = 1;
+char   *instance;
+char   *krbtkfile_env;
+int    authok;
+#endif

 
 struct passwd *pwd;
 
 struct passwd *pwd;

-char   *strcat(), *rindex(), *index(), *malloc(), *realloc();
-int    timedout();
-char   *ttyname();
-char   *crypt();
-char   *getpass();
-char   *stypeof();
-extern char **environ;
-extern int errno;
-
-struct tchars tc = {
-       CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
-};
-struct ltchars ltc = {
-       CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
-};
-
-struct winsize win = { 0, 0, 0, 0 };
-
-int    rflag;
-int    usererr = -1;
-char   rusername[NMAX+1], lusername[NMAX+1];
-char   rpassword[NMAX+1];
-char   name[NMAX+1];
-char   *rhost;
+int    failures;
+char   term[64], *envinit[1], *hostname, *username, *tty;

 
 

+int

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

+       int argc;

        char *argv[];
 {
        char *argv[];
 {

-       register char *namep;
-       int pflag = 0, hflag = 0, t, f, c;
-       int invalid, quietlog;
-       FILE *nlfd;
-       char *ttyn, *tty;
-       int ldisc = 0, zero = 0, i;
-       char **envnew;
-
-       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 char **environ;
+       struct group *gr;
+       struct stat st;
+       struct timeval tp;
+       struct utmp utmp;
+       int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
+       uid_t uid;
+       char *domain, *p, *salt, *ttyn;
+       char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
+       char localhost[MAXHOSTNAMELEN];
+
+       (void)signal(SIGALRM, timedout);
+       (void)alarm(timeout);
+       (void)signal(SIGQUIT, SIG_IGN);
+       (void)signal(SIGINT, SIG_IGN);
+       (void)setpriority(PRIO_PROCESS, 0, 0);
+
+       openlog("login", LOG_ODELAY, LOG_AUTH);
+

        /*
         * -p is used by getty to tell login not to destroy the environment
        /*
         * -p is used by getty to tell login not to destroy the environment

-        * -r is used by rlogind to cause the autologin protocol;
-        * -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
+        * -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

         */
         */

-       while (argc > 1) {
-               if (strcmp(argv[1], "-r") == 0) {
-                       if (rflag || hflag) {
-                               printf("Only one of -r and -h allowed\n");
-                               exit(1);
-                       }
-                       rflag = 1;
-                       usererr = doremotelogin(argv[2]);
-                       SCPYN(utmp.ut_host, argv[2]);
-                       argc -= 2;
-                       argv += 2;
-                       continue;
-               }
-               if (strcmp(argv[1], "-h") == 0 && getuid() == 0) {
-                       if (rflag || hflag) {
-                               printf("Only one of -r and -h allowed\n");
-                               exit(1);
-                       }
+       domain = NULL;
+       if (gethostname(localhost, sizeof(localhost)) < 0)
+               syslog(LOG_ERR, "couldn't get local hostname: %m");
+       else
+               domain = strchr(localhost, '.');
+
+       fflag = hflag = pflag = 0;
+       uid = getuid();
+       while ((ch = getopt(argc, argv, "fh:p")) != EOF)
+               switch (ch) {
+               case 'f':
+                       fflag = 1;
+                       break;
+               case 'h':
+                       if (uid)
+                               errx(1, "-h option: %s", strerror(EPERM));

                        hflag = 1;
                        hflag = 1;

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

                        pflag = 1;
                        pflag = 1;

-                       continue;
+                       break;
+               case '?':
+               default:
+                       if (!uid)
+                               syslog(LOG_ERR, "invalid flag %c", ch);
+                       (void)fprintf(stderr,
+                           "usage: login [-fp] [-h hostname] [username]\n");
+                       exit(1);

                }
                }

-               break;
+       argc -= optind;
+       argv += optind;
+
+       if (*argv) {
+               username = *argv;
+               ask = 0;
+       } else
+               ask = 1;
+
+       for (cnt = getdtablesize(); cnt > 2; cnt--)
+               (void)close(cnt);
+
+       ttyn = ttyname(STDIN_FILENO);
+       if (ttyn == NULL || *ttyn == '\0') {
+               (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
+               ttyn = tname;

        }
        }

-       ioctl(0, TIOCLSET, &zero);
-       ioctl(0, TIOCNXCL, 0);
-       ioctl(0, FIONBIO, &zero);
-       ioctl(0, FIOASYNC, &zero);
-       ioctl(0, TIOCGETP, &ttyb);
-       /*
-        * If talking to an rlogin process,
-        * propagate the terminal type and
-        * baud rate across the network.
-        */
-       if (rflag)
-               doremoteterm(term, &ttyb);
-       ioctl(0, TIOCSLTC, &ltc);
-       ioctl(0, TIOCSETC, &tc);
-       ioctl(0, TIOCSETP, &ttyb);
-       for (t = getdtablesize(); t > 3; t--)
-               close(t);
-       ttyn = ttyname(0);
-       if (ttyn == (char *)0)
-               ttyn = "/dev/tty??";
-       tty = rindex(ttyn, '/');
-       if (tty == NULL)
-               tty = ttyn;
+       if (tty = strrchr(ttyn, '/'))
+               ++tty;

        else
        else

-               tty++;
-       openlog("login", LOG_ODELAY, 0);
-       t = 0;
-       do {
-               ldisc = 0;
-               ioctl(0, TIOCSETD, &ldisc);
-               invalid = FALSE;
-               SCPYN(utmp.ut_name, "");
-               /*
-                * Name specified, take it.
-                */
-               if (argc > 1) {
-                       SCPYN(utmp.ut_name, argv[1]);
-                       argc = 0;
+               tty = ttyn;
+
+       for (cnt = 0;; ask = 1) {
+               if (ask) {
+                       fflag = 0;
+                       getloginname();

                }
                }

-               /*
-                * If remote login take given name,
-                * otherwise prompt user for something.
-                */
-               if (rflag) {
-                       SCPYN(utmp.ut_name, lusername);
-                       if (usererr == -1)
-                               rflag = 0;
+               rootlogin = 0;
+#ifdef KERBEROS
+               if ((instance = strchr(username, '.')) != NULL) {
+                       if (strncmp(instance, ".root", 5) == 0)
+                               rootlogin = 1;
+                       *instance++ = '\0';

                } else
                } else

-                       getloginname(&utmp);
-               if (!strcmp(pwd->pw_shell, "/bin/csh")) {
-                       ldisc = NTTYDISC;
-                       ioctl(0, TIOCSETD, &ldisc);
-               }
+                       instance = "";
+#endif
+               if (strlen(username) > UT_NAMESIZE)
+                       username[UT_NAMESIZE] = '\0';
+

                /*
                /*

-                * 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 && *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 logins disabled.
+                * if we have a valid account name, and it doesn't have a
+                * password, or the -f option was specified and the caller
+                * is root or the caller isn't changing their uid, don't
+                * authenticate.

                 */
                 */

-               if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
-                       while ((c = getc(nlfd)) != EOF)
-                               putchar(c);
-                       fflush(stdout);
-                       sleep(5);
-                       exit(0);
+               if (pwd && (*pwd->pw_passwd == '\0' ||
+                   fflag && (uid == 0 || uid == pwd->pw_uid)))
+                       break;
+               fflag = 0;
+               if (pwd && pwd->pw_uid == 0)
+                       rootlogin = 1;
+
+               (void)setpriority(PRIO_PROCESS, 0, -4);
+
+               p = getpass("Password:");
+
+               if (pwd) {
+#ifdef KERBEROS
+                       rval = klogin(pwd, instance, localhost, p);
+                       if (rval != 0 && rootlogin && pwd->pw_uid != 0)
+                               rootlogin = 0;
+                       if (rval == 0)
+                               authok = 1;
+                       else if (rval == 1)
+                               rval = strcmp(crypt(p, salt), pwd->pw_passwd);
+#else
+                       rval = strcmp(crypt(p, salt), pwd->pw_passwd);
+#endif

                }
                }

+               memset(p, 0, strlen(p));
+
+               (void)setpriority(PRIO_PROCESS, 0, 0);
+

                /*
                /*

-                * If valid so far and root is logging in,
-                * see if root logins on this terminal are permitted.
+                * If trying to log in as root without Kerberos,
+                * but with insecure terminal, refuse the login attempt.

                 */
                 */

-               if (!invalid && pwd->pw_uid == 0 && !rootterm(tty)) {
-                       syslog(LOG_SECURITY, "ROOT LOGIN REFUSED %s", tty);
-                       invalid = TRUE;
-               }
-               if (invalid) {
-                       printf("Login incorrect\n");
-                       if (++t >= 5) {
-                               syslog(LOG_SECURITY,
-                                   "REPEATED LOGIN FAILURES %s, %s",
-                                       tty, utmp.ut_name);
-                               ioctl(0, TIOCHPCL, (struct sgttyb *) 0);
-                               close(0), close(1), close(2);
-                               sleep(10);
-                               exit(1);
-                       }
+#ifdef KERBEROS
+               if (authok == 0)
+#endif
+               if (pwd && rootlogin && !rootterm(tty)) {
+                       (void)fprintf(stderr,
+                           "%s login refused on this terminal.\n",
+                           pwd->pw_name);
+                       if (hostname)
+                               syslog(LOG_NOTICE,
+                                   "LOGIN %s REFUSED FROM %s ON TTY %s",
+                                   pwd->pw_name, hostname, tty);
+                       else
+                               syslog(LOG_NOTICE,
+                                   "LOGIN %s REFUSED ON TTY %s",
+                                    pwd->pw_name, tty);
+                       continue;

                }
                }

-               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 = "/";
+
+               if (pwd && !rval)
+                       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);
+                               sleepexit(1);

                        }
                        }

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

                }
                }

-               /*
-                * 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");
-               else
-                       perror("quota (Q_SETUID)");
-               sleep(5);
-               exit(0);
-       }
-       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 ((f = open("/usr/adm/wtmp", O_WRONLY|O_APPEND)) >= 0) {
-               write(f, (char *)&utmp, sizeof(utmp));
-               close(f);
-       }
-       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);
-               }
-               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);
+
+       /* committed to login -- turn off timeout */
+       (void)alarm((u_int)0);
+
+       endpwent();
+
+       /* if user not super-user, check for disabled logins */
+       if (!rootlogin)
+               checknologin();
+
+       if (chdir(pwd->pw_dir) < 0) {
+               (void)printf("No home directory %s!\n", pwd->pw_dir);
+               if (chdir("/"))
+                       exit(0);
+               pwd->pw_dir = "/";
+               (void)printf("Logging in with home = \"/\".\n");

        }
        }

-       chown(ttyn, pwd->pw_uid, pwd->pw_gid);
-       if (!hflag)                                     /* XXX */
-               ioctl(0, TIOCSWINSZ, &win);
-       chmod(ttyn, 0622);
-       setgid(pwd->pw_gid);
-       strncpy(name, utmp.ut_name, NMAX);
-       name[NMAX] = '\0';
-       initgroups(name, pwd->pw_gid);
-       quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
-       setuid(pwd->pw_uid);
-       /* destroy environment unless user has asked to preserve it */
+
+       quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
+
+       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 (pwd->pw_change - tp.tv_sec <
+                   2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
+                       (void)printf("Warning: your password expires on %s",
+                           ctime(&pwd->pw_change));
+       if (pwd->pw_expire)
+               if (tp.tv_sec >= pwd->pw_expire) {
+                       (void)printf("Sorry -- your account has expired.\n");
+                       sleepexit(1);
+               } else if (pwd->pw_expire - tp.tv_sec <
+                   2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
+                       (void)printf("Warning: your account expires on %s",
+                           ctime(&pwd->pw_expire));
+
+       /* Nothing else left to fail -- really log in. */
+       memset((void *)&utmp, 0, sizeof(utmp));
+       (void)time(&utmp.ut_time);
+       (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
+       if (hostname)
+               (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
+       (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
+       login(&utmp);
+
+       dolastlog(quietlog);
+
+       (void)chown(ttyn, pwd->pw_uid,
+           (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
+       (void)setgid(pwd->pw_gid);
+
+       initgroups(username, pwd->pw_gid);
+
+       if (*pwd->pw_shell == '\0')
+               pwd->pw_shell = _PATH_BSHELL;
+
+       /* Destroy environment unless user has requested its preservation. */

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

-
-       /* set up environment, this time without destruction */
-       /* copy the environment before setenving */
-       i = 0;
-       while (environ[i] != NULL)
-               i++;
-       envnew = (char **) malloc(sizeof (char *) * (i + 1));
-       for (; i >= 0; i--)
-               envnew[i] = environ[i];
-       environ = envnew;
-
-       setenv("HOME=", pwd->pw_dir);
-       setenv("SHELL=", pwd->pw_shell);
+       (void)setenv("HOME", pwd->pw_dir, 1);
+       (void)setenv("SHELL", pwd->pw_shell, 1);

        if (term[0] == '\0')
        if (term[0] == '\0')

-               strncpy(term, stypeof(tty), sizeof(term));
-       setenv("TERM=", term);
-       setenv("USER=", pwd->pw_name);
-       setenv("PATH=", ":/usr/ucb:/bin:/usr/bin");
+               (void)strncpy(term, stypeof(tty), sizeof(term));
+       (void)setenv("TERM", term, 0);
+       (void)setenv("LOGNAME", pwd->pw_name, 1);
+       (void)setenv("USER", pwd->pw_name, 1);
+       (void)setenv("PATH", _PATH_DEFPATH, 0);
+#ifdef KERBEROS
+       if (krbtkfile_env)
+               (void)setenv("KRBTKFILE", krbtkfile_env, 1);
+#endif

 
 

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

-       if (pwd->pw_uid == 0)
-               syslog(LOG_SECURITY, "ROOT LOGIN %s", tty);
-       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 " : "");
+       /* If fflag is on, assume caller/authenticator has logged root login. */
+       if (rootlogin && fflag == 0)
+               if (hostname)
+                       syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
+                           username, tty, hostname);
+               else
+                       syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
+
+#ifdef KERBEROS
+       if (!quietlog && notickets == 1)
+               (void)printf("Warning: no Kerberos tickets issued.\n");
+#endif
+
+       if (!quietlog) {
+               (void)printf("%s\n\t%s  %s\n\n",
+           "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
+                   "The Regents of the University of California. ",
+                   "All rights reserved.");
+               motd();
+               (void)snprintf(tbuf,
+                   sizeof(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");
-       exit(0);
+
+       (void)signal(SIGALRM, SIG_DFL);
+       (void)signal(SIGQUIT, SIG_DFL);
+       (void)signal(SIGINT, SIG_DFL);
+       (void)signal(SIGTSTP, SIG_IGN);
+
+       tbuf[0] = '-';
+       (void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
+           p + 1 : pwd->pw_shell);
+
+       if (setlogin(pwd->pw_name) < 0)
+               syslog(LOG_ERR, "setlogin() failure: %m");
+
+       /* Discard permissions last so can't get killed and drop core. */
+       if (rootlogin)
+               (void) setuid(0);
+       else
+               (void) setuid(pwd->pw_uid);
+
+       execlp(pwd->pw_shell, tbuf, 0);
+       err(1, "%s", pwd->pw_shell);

 }
 
 }
 

-getloginname(up)
-       register struct utmp *up;
+#ifdef KERBEROS
+#define        NBUFSIZ         (UT_NAMESIZE + 1 + 5)   /* .root suffix */
+#else
+#define        NBUFSIZ         (UT_NAMESIZE + 1)
+#endif
+
+void
+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)
+       int ch;
+       char *p;
+       static char nbuf[NBUFSIZ];
+
+       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 + (NBUFSIZ - 1))
+                               *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()
+int
+rootterm(ttyn)
+       char *ttyn;

 {
 {

+       struct ttyent *t;

 
 

-       printf("Login timed out after %d seconds\n", timeout);
-       exit(0);
+       return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);

 }
 
 }
 

-int    stopmotd;
-catch()
-{
+jmp_buf motdinterrupt;

 
 

-       signal(SIGINT, SIG_IGN);
-       stopmotd++;
+void
+motd()
+{
+       int fd, nchars;
+       sig_t oldint;
+       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);

 }
 
 }
 

-rootterm(tty)
-       char *tty;
+/* ARGSUSED */
+void
+sigint(signo)
+       int signo;

 {
 {

-       register struct ttyent *t;

 
 

-       if ((t = getttynam(tty)) != NULL) {
-               if (t->ty_status & TTY_SECURE)
-                       return (1);
-       }
-       return (0);
+       longjmp(motdinterrupt, 1);

 }
 
 }
 

-showmotd()
+/* ARGSUSED */
+void
+timedout(signo)
+       int signo;

 {
 {

-       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);
-       }
-       signal(SIGINT, SIG_IGN);
-}

 
 

-#undef UNKNOWN
-#define UNKNOWN "su"
+       (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
+       exit(0);
+}

 
 

-char *
-stypeof(ttyid)
-       char *ttyid;
+void
+checknologin()

 {
 {

-       register struct ttyent *t;
+       int fd, nchars;
+       char tbuf[8192];

 
 

-       if (ttyid == NULL || (t = getttynam(ttyid)) == NULL)
-               return (UNKNOWN);
-       return (t->ty_type);
+       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);
+       }

 }
 
 }
 

-doremotelogin(host)
-       char *host;
+void
+dolastlog(quiet)
+       int quiet;

 {
 {

-       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);
+       struct lastlog ll;
+       int fd;
+
+       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",
+                                           (int)sizeof(ll.ll_host),
+                                           ll.ll_host);
+                               else
+                                       (void)printf("on %.*s\n",
+                                           (int)sizeof(ll.ll_line),
+                                           ll.ll_line);
+                       }
+                       (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
+               }
+               memset((void *)&ll, 0, sizeof(ll));
+               (void)time(&ll.ll_time);
+               (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
+               if (hostname)
+                       (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
+               (void)write(fd, (char *)&ll, sizeof(ll));
+               (void)close(fd);

        }
        }

-       return(ruserok(host, (pwd->pw_uid == 0), rusername, lusername));

 }
 
 }
 

-getstr(buf, cnt, err)
-       char *buf;
-       int cnt;
-       char *err;
+void
+badlogin(name)
+       char *name;

 {
 {

-       char c;

 
 

-       do {
-               if (read(0, &c, 1) != 1)
-                       exit(1);
-               if (--cnt < 0) {
-                       printf("%s too long\r\n", err);
-                       exit(1);
-               }
-               *buf++ = c;
-       } while (c != 0);
+       if (failures == 0)
+               return;
+       if (hostname) {
+               syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
+                   failures, failures > 1 ? "S" : "", hostname);
+               syslog(LOG_AUTHPRIV|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",
+                   failures, failures > 1 ? "S" : "", tty);
+               syslog(LOG_AUTHPRIV|LOG_NOTICE,
+                   "%d LOGIN FAILURE%s ON %s, %s",
+                   failures, failures > 1 ? "S" : "", tty, name);
+       }

 }
 
 }
 

-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]))
+#undef UNKNOWN
+#define        UNKNOWN "su"

 
 

-doremoteterm(term, tp)
-       char *term;
-       struct sgttyb *tp;
+char *
+stypeof(ttyid)
+       char *ttyid;

 {
 {

-       register char *cp = index(term, '/'), **cpp;
-       char *speed;
-       struct winsize ws;
-
-       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;
-                       }
-               ws.ws_row = ws.ws_col = -1;
-               ws.ws_xpixel = ws.ws_ypixel = -1;
-               if (cp) {
-                       ws.ws_row = atoi(cp);
-                       cp = index(cp, ',');
-                       if (cp == 0)
-                               goto done;
-                       ws.ws_col = atoi(++cp);
-                       cp = index(cp, ',');
-                       if (cp == 0)
-                               goto done;
-                       ws.ws_xpixel = atoi(++cp);
-                       cp = index(cp, ',');
-                       if (cp == 0)
-                               goto done;
-                       ws.ws_ypixel = atoi(++cp);
-               }
-done:
-               if (ws.ws_row != -1 && ws.ws_col != -1 &&
-                   ws.ws_xpixel != -1 && ws.ws_ypixel != -1)
-                       win = ws;
-       }
-       tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
+       struct ttyent *t;
+
+       return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);

 }
 
 }
 

-/*
- * Set the value of var to be arg in the Unix 4.2 BSD environment env.
- * Var should end with '='.
- * (bindings are of the form "var=value")
- * This procedure assumes the memory for the first level of environ
- * was allocated using malloc.
- */
-setenv(var, value)
-       char *var, *value;
+void
+sleepexit(eval)
+       int eval;

 {
 {

-       extern char **environ;
-       int index = 0;
-       int varlen = strlen(var);
-       int vallen = strlen(value);
-
-       for (index = 0; environ[index] != NULL; index++) {
-               if (strncmp(environ[index], var, varlen) == 0) {
-                       /* found it */
-                       environ[index] = malloc(varlen + vallen + 1);
-                       strcpy(environ[index], var);
-                       strcat(environ[index], value);
-                       return;
-               }
-       }
-       environ = (char **) realloc(environ, sizeof (char *) * (index + 2));
-       if (environ == NULL) {
-               fprintf(stderr, "login: malloc out of memory\n");
-               exit(1);
-       }
-       environ[index] = malloc(varlen + vallen + 1);
-       strcpy(environ[index], var);
-       strcat(environ[index], value);
-       environ[++index] = NULL;
+
+       (void)sleep(5);
+       exit(eval);

 }
 }