Initial import of KTH eBones. This has been cleaned up to only include

the "core" Kerberos functionality. The rest of the userland will get their
own changes later.

1 files changed, 990 insertions, 0 deletions

diff --git a/crypto/kerberosIV/appl/bsd/login.c b/crypto/kerberosIV/appl/bsd/login.c
new file mode 100644
index 0000000..c436f8d
--- /dev/null
+++ b/crypto/kerberosIV/appl/bsd/login.c
@@ -0,0 +1,990 @@
+/*-
+ * 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.
+ */
+
+/*
+ * login [ name ]
+ * login -h hostname	(for telnetd, etc.)
+ * login -f name	(for pre-authenticated login: datakit, xterm, etc.)
+ */
+
+#include "bsd_locl.h"
+
+RCSID("$Id: login.c,v 1.104 1997/05/20 20:35:06 assar Exp $");
+
+#include <otp.h>
+
+#include "sysv_default.h"
+#ifdef SYSV_SHADOW
+#include "sysv_shadow.h"
+#endif
+
+static	void	 badlogin (char *);
+static	void	 checknologin (void);
+static	void	 dolastlog (int);
+static	void	 getloginname (int);
+static	int	 rootterm (char *);
+static	char	*stypeof (char *);
+static	RETSIGTYPE	 timedout (int);
+static	int	 doremotelogin (char *);
+void	login_fbtab (char *, uid_t, gid_t);
+#ifdef KERBEROS
+int	klogin (struct passwd *, char *, char *, char *);
+#endif
+
+#define	TTYGRPNAME	"tty"		/* name of group to own ttys */
+
+/*
+ * This bounds the time given to login.  Change it in
+ * `/etc/default/login'.
+ */
+
+static	u_int	login_timeout;
+
+#ifdef KERBEROS
+int	notickets = 1;
+int	noticketsdontcomplain = 1;
+char	*instance;
+char	*krbtkfile_env;
+int	authok;
+#endif
+
+#ifdef HAVE_SHADOW_H
+static  struct spwd *spwd = NULL;
+#endif
+
+static	char    *ttyprompt;
+
+static	struct	passwd *pwd;
+static	int	failures;
+static	char	term[64], *hostname, *username, *tty;
+
+static  char rusername[100], lusername[100];
+
+static int
+change_passwd(struct passwd  *who)
+{
+        int             status;
+        int             pid;
+        int             wpid;
+ 
+        switch (pid = fork()) {
+	case -1:
+	    warn("fork /bin/passwd");
+	    sleepexit(1);
+	case 0:
+	    execlp("/bin/passwd", "passwd", who->pw_name, (char *) 0);
+	    _exit(1);
+	default:
+	    while ((wpid = wait(&status)) != -1 && wpid != pid)
+		/* void */ ;
+	    return (status);
+	}
+}
+
+#ifndef NO_MOTD /* message of the day stuff */
+
+jmp_buf motdinterrupt;
+
+static RETSIGTYPE
+sigint(int signo)
+{
+	longjmp(motdinterrupt, 1);
+}
+
+static void
+motd(void)
+{
+	int fd, nchars;
+	RETSIGTYPE (*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)
+			write(fileno(stdout), tbuf, nchars);
+	signal(SIGINT, oldint);
+	close(fd);
+}
+
+#endif /* !NO_MOTD */
+
+#define AUTH_NONE 0
+#define AUTH_OTP  1
+
+/*
+ * getpwnam and try to detect the worst form of NIS attack.
+ */
+
+static struct passwd *
+paranoid_getpwnam (char *user)
+{
+	struct passwd *p;
+
+	p = k_getpwnam (user);
+	if (p == NULL)
+		return p;
+	if (p->pw_uid == 0 && strcmp (username, "root") != 0) {
+		syslog (LOG_ALERT,
+			"NIS attack, user %s has uid 0", username);
+		return NULL;
+	}
+	return p;
+}
+
+int
+main(int argc, char **argv)
+{
+	struct group *gr;
+	int ask, ch, cnt, fflag, hflag, pflag, quietlog, nomailcheck;
+	int rootlogin, rval;
+	int rflag;
+	int changepass = 0;
+	uid_t uid;
+	char *domain, *p, passwd[128], *ttyn;
+	char tbuf[MaxPathLen + 2], tname[sizeof(_PATH_TTY) + 10];
+	char localhost[MaxHostNameLen];
+	char full_hostname[MaxHostNameLen];
+	int auth_level = AUTH_NONE;
+	OtpContext otp_ctx;
+	int mask = 022;		/* Default umask (set below) */
+	int maxtrys = 5;	/* Default number of allowed failed logins */
+
+	set_progname(argv[0]);
+
+	openlog("login", LOG_ODELAY, LOG_AUTH);
+
+        /* Read defaults file and set the login timeout period. */
+        sysv_defaults();
+        login_timeout = atoi(default_timeout);
+        maxtrys = atoi(default_maxtrys);
+        if (sscanf(default_umask, "%o", &mask) != 1 || (mask & ~0777))
+                syslog(LOG_WARNING, "bad umask default: %s", default_umask);
+        else
+                umask(mask);
+
+	signal(SIGALRM, timedout);
+	alarm(login_timeout);
+	signal(SIGQUIT, SIG_IGN);
+	signal(SIGINT, SIG_IGN);
+	setpriority(PRIO_PROCESS, 0, 0);
+
+	/*
+	 * -p is used by getty to tell login not to destroy the environment
+	 * -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
+	 * -r is used by old-style rlogind to execute the autologin protocol
+	 */
+
+	*full_hostname = '\0';
+	domain = NULL;
+	if (k_gethostname(localhost, sizeof(localhost)) < 0)
+		syslog(LOG_ERR, "couldn't get local hostname: %m");
+	else
+		domain = strchr(localhost, '.');
+
+	fflag = hflag = pflag = rflag = 0;
+	uid = getuid();
+	while ((ch = getopt(argc, argv, "a:d:fh:pr:")) != EOF)
+	        switch (ch) {
+		case 'a':
+			if (strcmp (optarg, "none") == 0)
+				auth_level = AUTH_NONE;
+			else if (strcmp (optarg, "otp") == 0)
+				auth_level = AUTH_OTP;
+			else
+				warnx ("bad value for -a: %s", optarg);
+			break;
+		case 'd':
+			break;
+		case 'f':
+			fflag = 1;
+			break;
+		case 'h':
+			if (rflag || hflag) {
+			    printf("Only one of -r and -h allowed\n");
+			    exit(1);
+                        }
+			if (uid)
+				errx(1, "-h option: %s", strerror(EPERM));
+			hflag = 1;
+			strncpy(full_hostname, optarg, sizeof(full_hostname)-1);
+			if (domain && (p = strchr(optarg, '.')) &&
+			    strcasecmp(p, domain) == 0)
+				*p = 0;
+			hostname = optarg;
+			break;
+		case 'p':
+			if (getuid()) {
+				warnx("-p for super-user only.");
+				exit(1);
+                        }
+			pflag = 1;
+			break;
+	        case 'r':
+			if (rflag || hflag) {
+				warnx("Only one of -r and -h allowed\n");
+				exit(1);
+                        }
+			if (getuid()) {
+				warnx("-r for super-user only.");
+				exit(1);
+                        }
+			rflag = 1;
+			strncpy(full_hostname, optarg, sizeof(full_hostname)-1);
+			if (domain && (p = strchr(optarg, '.')) &&
+			    strcasecmp(p, domain) == 0)
+				*p = 0;
+			hostname = optarg;
+			fflag = (doremotelogin(full_hostname) == 0);
+			break;
+		case '?':
+		default:
+			if (!uid)
+				syslog(LOG_ERR, "invalid flag %c", ch);
+			fprintf(stderr,
+				"usage: login [-fp] [-a otp]"
+				"[-h hostname | -r hostname] [username]\n");
+			exit(1);
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (geteuid() != 0) {
+		warnx("only root may use login, use su");
+	        /* Or install login setuid root, which is not necessary */
+		sleep(10);
+		exit(1);
+	}
+        /*
+         * Figure out if we should ask for the username or not. The name
+         * may be given on the command line or via the environment, and
+         * it may even be in the terminal input queue.
+         */
+        if (rflag) {
+                username = lusername;
+                ask = 0;
+	      } else
+        if (*argv && strchr(*argv, '=')) {
+                ask = 1;
+	      } else
+        if (*argv && strcmp(*argv, "-") == 0) {
+                argc--;
+                argv++;
+                ask = 1;
+	      } else
+	if (*argv) {
+		username = *argv;
+		ask = 0;
+                argc--;
+                argv++;
+        } else if ((ttyprompt = getenv("TTYPROMPT")) && *ttyprompt) {
+                getloginname(0);
+                ask = 0;
+	} else
+		ask = 1;
+
+	/* Default tty settings. */
+	stty_default();
+
+	for (cnt = getdtablesize(); cnt > 2; cnt--)
+		close(cnt);
+
+        /*
+         * Determine the tty name. BSD takes the basename, SYSV4 takes
+         * whatever remains after stripping the "/dev/" prefix. The code
+         * below should produce sensible results in either environment.
+         */
+        ttyn = ttyname(STDIN_FILENO);
+        if (ttyn == NULL || *ttyn == '\0') {
+	        snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
+	        ttyn = tname;
+	}
+        if ((tty = strchr(ttyn + 1, '/')))
+	        ++tty;
+        else
+	        tty = ttyn;
+
+	for (cnt = 0;; ask = 1) {
+	        char prompt[128], ss[256];
+		if (ask) {
+			fflag = 0;
+			getloginname(1);
+		}
+		rootlogin = 0;
+		rval = 1;
+#ifdef	KERBEROS
+		if ((instance = strchr(username, '.')) != NULL) {
+		    if (strcmp(instance, ".root") == 0)
+			rootlogin = 1;
+		    *instance++ = '\0';
+		} else
+		    instance = "";
+#endif
+		if (strlen(username) > UT_NAMESIZE)
+			username[UT_NAMESIZE] = '\0';
+
+		/*
+		 * 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;
+		}
+		strcpy(tbuf, username);
+
+		pwd = paranoid_getpwnam (username);
+
+		/*
+		 * 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) {
+			if (pwd->pw_uid == 0)
+				rootlogin = 1;
+
+			if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
+				/* already authenticated */
+				break;
+			} else if (pwd->pw_passwd[0] == '\0') {
+				/* pretend password okay */
+				rval = 0;
+				goto ttycheck;
+			}
+		}
+
+		fflag = 0;
+
+		setpriority(PRIO_PROCESS, 0, -4);
+
+		if (otp_challenge (&otp_ctx, username,
+				   ss, sizeof(ss)) == 0)
+			snprintf (prompt, sizeof(prompt), "%s's %s Password: ",
+				  username, ss);
+		else {
+			if (auth_level == AUTH_NONE)
+				snprintf(prompt, sizeof(prompt), "%s's Password: ",
+					 username);
+			else {
+				char *s;
+
+				rval = 1;
+				s = otp_error(&otp_ctx);
+				if(s)
+					printf ("OTP: %s\n", s);
+				continue;
+			}
+		}
+
+		if (des_read_pw_string (passwd, sizeof(passwd) - 1, prompt, 0))
+			continue;
+		passwd[sizeof(passwd) - 1] = '\0';
+
+		/* Verify it somehow */
+
+		if (otp_verify_user (&otp_ctx, passwd) == 0)
+			rval = 0;
+		else if (pwd == NULL)
+			;
+		else if (auth_level == AUTH_NONE) {
+			uid_t pwd_uid = pwd->pw_uid;
+
+			rval = unix_verify_user (username, passwd);
+
+			if (rval == 0)
+			  {
+			    if (rootlogin && pwd_uid != 0)
+			      rootlogin = 0;
+			  }
+			else
+			  {
+			    rval = klogin(pwd, instance, localhost, passwd);
+			    if (rval != 0 && rootlogin && pwd_uid != 0)
+			      rootlogin = 0;
+			    if (rval == 0)
+			      authok = 1;
+			  }
+		} else {
+			char *s;
+
+			rval = 1;
+			if ((s = otp_error(&otp_ctx)))
+				printf ("OTP: %s\n", s);
+		}
+
+		memset (passwd, 0, sizeof(passwd));
+		setpriority (PRIO_PROCESS, 0, 0);
+
+		/*
+		 * Santa Claus, give me a portable and reentrant getpwnam.
+		 */
+		pwd = paranoid_getpwnam (username);
+
+	ttycheck:
+		/*
+		 * If trying to log in as root without Kerberos,
+		 * but with insecure terminal, refuse the login attempt.
+		 */
+#ifdef KERBEROS
+		if (authok == 0)
+#endif
+		if (pwd && !rval && rootlogin && !rootterm(tty)
+		    && !rootterm(ttyn)) {
+			warnx("%s login refused on this terminal.",
+			      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 (rval == 0)
+			break;
+
+		printf("Login incorrect\n");
+		failures++;
+
+                /* max number of attemps and delays taken from defaults file */
+		/* we allow maxtrys tries, but after 2 we start backing off */
+		if (++cnt > 2) {
+			if (cnt >= maxtrys) {
+				badlogin(username);
+				sleepexit(1);
+			}
+			sleep((u_int)((cnt - 2) * atoi(default_sleep)));
+		}
+	}
+
+	/* committed to login -- turn off timeout */
+	alarm(0);
+
+	endpwent();
+
+#if defined(HAVE_GETUDBNAM) && defined(HAVE_SETLIM)
+	{
+	    struct udb *udb;
+	    long t;
+	    const long maxcpu = 46116860184; /* some random constant */
+	    udb = getudbnam(pwd->pw_name);
+	    if(udb == UDB_NULL){
+		    warnx("Failed to get UDB entry.");
+		    exit(1);
+	    }
+	    t = udb->ue_pcpulim[UDBRC_INTER];
+	    if(t == 0 || t > maxcpu)
+		t = CPUUNLIM;
+	    else
+		t *= 100 * CLOCKS_PER_SEC;
+
+	    if(limit(C_PROC, 0, L_CPU, t) < 0)
+		warn("limit C_PROC");
+
+	    t = udb->ue_jcpulim[UDBRC_INTER];
+	    if(t == 0 || t > maxcpu)
+		t = CPUUNLIM;
+	    else
+		t *= 100 * CLOCKS_PER_SEC;
+
+	    if(limit(C_JOBPROCS, 0, L_CPU, t) < 0)
+		warn("limit C_JOBPROCS");
+
+	    nice(udb->ue_nice[UDBRC_INTER]);
+	}
+#endif
+	/* if user not super-user, check for disabled logins */
+	if (!rootlogin)
+		checknologin();
+
+	if (chdir(pwd->pw_dir) < 0) {
+		printf("No home directory %s!\n", pwd->pw_dir);
+		if (chdir("/"))
+			exit(0);
+		pwd->pw_dir = "/";
+		printf("Logging in with home = \"/\".\n");
+	}
+
+	quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
+	nomailcheck = access(_PATH_NOMAILCHECK, F_OK) == 0;
+
+#if defined(HAVE_PASSWD_CHANGE) && defined(HAVE_PASSWD_EXPIRE)
+	if (pwd->pw_change || pwd->pw_expire)
+		gettimeofday(&tp, (struct timezone *)NULL);
+
+	if (pwd->pw_change)
+		if (tp.tv_sec >= pwd->pw_change) {
+			printf("Sorry -- your password has expired.\n");
+			changepass=1;
+		} else if (pwd->pw_change - tp.tv_sec <
+		    2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
+			printf("Warning: your password expires on %s",
+			    ctime(&pwd->pw_change));
+	if (pwd->pw_expire)
+		if (tp.tv_sec >= pwd->pw_expire) {
+			printf("Sorry -- your account has expired.\n");
+			sleepexit(1);
+		} else if (pwd->pw_expire - tp.tv_sec <
+		    2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
+			printf("Warning: your account expires on %s",
+			    ctime(&pwd->pw_expire));
+#endif /* defined(HAVE_PASSWD_CHANGE) && defined(HAVE_PASSWD_EXPIRE) */
+
+	/* Nothing else left to fail -- really log in. */
+
+        /*
+         * Update the utmp files, both BSD and SYSV style.
+         */
+        if (utmpx_login(tty, username, hostname ? hostname : "") != 0
+	    && !fflag) {
+                printf("No utmpx entry.  You must exec \"login\" from the lowest level \"sh\".\n");
+                sleepexit(0);
+        }
+	utmp_login(ttyn, username, hostname ? hostname : "");
+	dolastlog(quietlog);
+
+	/*
+	 * Set device protections, depending on what terminal the
+	 * user is logged in. This feature is used on Suns to give
+	 * console users better privacy.
+	 */
+	login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
+
+	chown(ttyn, pwd->pw_uid,
+	    (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
+	chmod(ttyn, S_IRUSR | S_IWUSR | S_IWGRP);
+	setgid(pwd->pw_gid);
+
+	initgroups(username, pwd->pw_gid);
+
+	if (*pwd->pw_shell == '\0')
+		pwd->pw_shell = _PATH_BSHELL;
+
+        /*
+         * Set up a new environment. With SYSV, some variables are always
+         * preserved; some varables are never preserved, and some variables
+         * are always clobbered. With BSD, nothing is always preserved, and
+         * some variables are always clobbered. We add code to make sure
+         * that LD_* and IFS are never preserved.
+         */
+	if (term[0] == '\0')
+		strncpy(term, stypeof(tty), sizeof(term));
+        /* set up a somewhat censored environment. */
+        sysv_newenv(argc, argv, pwd, term, pflag);
+#ifdef KERBEROS
+	if (krbtkfile_env)
+	    setenv("KRBTKFILE", krbtkfile_env, 1);
+#endif
+
+	if (tty[sizeof("tty")-1] == 'd')
+		syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
+
+	/* 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 && !noticketsdontcomplain)
+		printf("Warning: no Kerberos tickets issued.\n");
+#endif
+
+#ifdef LOGALL
+	/*
+	 * Syslog each successful login, so we don't have to watch hundreds
+	 * of wtmp or lastlogin files.
+	 */
+	if (hostname) {
+		syslog(LOG_INFO, "login from %s as %s", hostname, pwd->pw_name);
+	} else {
+		syslog(LOG_INFO, "login on %s as %s", tty, pwd->pw_name);
+	}
+#endif
+
+#ifndef NO_MOTD
+        /*
+         * Optionally show the message of the day. System V login leaves
+         * motd and mail stuff up to the shell startup file.
+         */
+	if (!quietlog) {
+	        struct stat st;
+#if 0
+		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.");
+#endif
+		motd();
+		if(!nomailcheck){
+		    snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
+		    if (stat(tbuf, &st) == 0 && st.st_size != 0)
+			printf("You have %smail.\n",
+			       (st.st_mtime > st.st_atime) ? "new " : "");
+		}
+	}
+#endif /* NO_MOTD */
+
+#ifdef LOGIN_ACCESS
+	if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) {
+		printf("Permission denied\n");
+		if (hostname)
+			syslog(LOG_NOTICE, "%s LOGIN REFUSED FROM %s",
+				pwd->pw_name, hostname);
+		else
+			syslog(LOG_NOTICE, "%s LOGIN REFUSED ON %s",
+				pwd->pw_name, tty);
+		sleepexit(1);
+	}
+#endif
+
+	signal(SIGALRM, SIG_DFL);
+	signal(SIGQUIT, SIG_DFL);
+	signal(SIGINT, SIG_DFL);
+	signal(SIGTSTP, SIG_IGN);
+
+	tbuf[0] = '-';
+	strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
+	       p + 1 : pwd->pw_shell);
+
+#ifdef HAVE_SETLOGIN
+     	if (setlogin(pwd->pw_name) < 0)
+                syslog(LOG_ERR, "setlogin() failure: %m");
+#endif
+
+#ifdef HAVE_SETPCRED
+	if (setpcred (pwd->pw_name, NULL) == -1)
+		syslog(LOG_ERR, "setpcred() failure: %m");
+#endif /* HAVE_SETPCRED */
+
+#if defined(SYSV_SHADOW) && defined(HAVE_GETSPNAM)
+	spwd = getspnam (username);
+	endspent ();
+#endif
+	/* Discard permissions last so can't get killed and drop core. */
+	{
+	    int uid = rootlogin ? 0 : pwd->pw_uid;
+	    if(setuid(uid) != 0){
+		    warn("setuid(%d)", uid);
+		    if(!rootlogin)
+			    exit(1);
+	    }
+	}
+		       
+
+	/*
+         * After dropping privileges and after cleaning up the environment,
+         * optionally run, as the user, /bin/passwd.
+         */
+ 
+        if (pwd->pw_passwd[0] == 0 &&
+	    strcasecmp(default_passreq, "YES") == 0) {
+                printf("You don't have a password.  Choose one.\n");
+                if (change_passwd(pwd))
+                        sleepexit(0);
+		changepass = 0;
+        }
+
+#ifdef SYSV_SHADOW
+        if (spwd && sysv_expire(spwd)) {
+                if (change_passwd(pwd))
+                        sleepexit(0);
+		changepass = 0;
+        }
+#endif /* SYSV_SHADOW */
+	if (changepass) {
+		int res;
+		if ((res=system(_PATH_CHPASS)))
+			sleepexit(1);
+	}
+
+	if (k_hasafs()) {
+	    char cell[64];
+	    k_setpag();
+	    if(k_afs_cell_of_file(pwd->pw_dir, cell, sizeof(cell)) == 0)
+		k_afsklog(cell, 0);
+	    k_afsklog(0, 0);
+	}
+
+	execlp(pwd->pw_shell, tbuf, 0);
+	if (getuid() == 0) {
+		warnx("Can't exec %s, trying %s\n", 
+		      pwd->pw_shell, _PATH_BSHELL);
+		execlp(_PATH_BSHELL, tbuf, 0);
+		err(1, "%s", _PATH_BSHELL);
+	}
+	err(1, "%s", pwd->pw_shell);
+	return 1;
+}
+
+#ifdef	KERBEROS
+#define	NBUFSIZ		(UT_NAMESIZE + 1 + 5)	/* .root suffix */
+#else
+#define	NBUFSIZ		(UT_NAMESIZE + 1)
+#endif
+
+static void
+getloginname(int prompt)
+{
+	int ch;
+	char *p;
+	static char nbuf[NBUFSIZ];
+
+	for (;;) {
+                if (prompt)
+                    if (ttyprompt && *ttyprompt)
+                        printf("%s", ttyprompt);
+                    else
+		        printf("login: ");
+		prompt = 1;
+		for (p = nbuf; (ch = getchar()) != '\n'; ) {
+			if (ch == EOF) {
+				badlogin(username);
+				exit(0);
+			}
+			if (p < nbuf + (NBUFSIZ - 1))
+				*p++ = ch;
+		}
+		if (p > nbuf)
+			if (nbuf[0] == '-')
+				warnx("login names may not start with '-'.");
+			else {
+				*p = '\0';
+				username = nbuf;
+				break;
+			}
+	}
+}
+
+static int
+rootterm(char *ttyn)
+{
+#ifndef HAVE_TTYENT_H
+        return (default_console == 0 || strcmp(default_console, ttyname(0)) == 0);
+#else
+	struct ttyent *t;
+
+	return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
+#endif
+}
+
+static RETSIGTYPE
+timedout(int signo)
+{
+	fprintf(stderr, "Login timed out after %d seconds\n",
+		login_timeout);
+	exit(0);
+}
+
+static void
+checknologin(void)
+{
+	int fd, nchars;
+	char tbuf[8192];
+
+	if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
+		while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
+			write(fileno(stdout), tbuf, nchars);
+		sleepexit(0);
+	}
+}
+
+static void
+dolastlog(int quiet)
+{
+#if defined(HAVE_LASTLOG_H) || defined(HAVE_LOGIN_H) || defined(SYSV_SHADOW)
+	struct lastlog ll;
+	int fd;
+
+	if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
+		lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
+#ifdef SYSV_SHADOW
+                if (read(fd, &ll, sizeof(ll)) == sizeof(ll) &&
+                    ll.ll_time != 0) {
+                        if (pwd->pw_uid && spwd && spwd->sp_inact > 0
+                            && ll.ll_time / (24 * 60 * 60)
+			    + spwd->sp_inact < time(0)) {
+                                printf("Your account has been inactive too long.\n");
+                                sleepexit(1);
+                        }
+                        if (!quiet) {
+                                printf("Last login: %.*s ",
+                                    24-5, ctime(&ll.ll_time));
+                                if (*ll.ll_host != '\0') {
+                                        printf("from %.*s\n",
+                                            (int)sizeof(ll.ll_host),
+					       ll.ll_host);
+                                } else
+                                        printf("on %.*s\n",
+                                            (int)sizeof(ll.ll_line),
+					       ll.ll_line);
+                        }
+                }
+                lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
+#else /* SYSV_SHADOW */
+		if (!quiet) {
+			if (read(fd, &ll, sizeof(ll)) == sizeof(ll) &&
+			    ll.ll_time != 0) {
+				printf("Last login: %.*s ",
+				    24-5, ctime(&ll.ll_time));
+				if (*ll.ll_host != '\0')
+					printf("from %.*s\n",
+					    (int)sizeof(ll.ll_host),
+					    ll.ll_host);
+				else
+					printf("on %.*s\n",
+					    (int)sizeof(ll.ll_line),
+					    ll.ll_line);
+			}
+			lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), SEEK_SET);
+		}
+#endif /* SYSV_SHADOW */
+		memset(&ll, 0, sizeof(ll));
+		time(&ll.ll_time);
+		strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
+		if (hostname)
+			strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
+		write(fd, &ll, sizeof(ll));
+		close(fd);
+	}
+#endif /* DOLASTLOG */
+}
+
+static void
+badlogin(char *name)
+{
+
+	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);
+	}
+}
+
+#undef	UNKNOWN
+#define	UNKNOWN	"su"
+
+static char *
+stypeof(char *ttyid)
+{
+    /* TERM is probably a better guess than anything else. */
+    char *term = getenv("TERM");
+
+    if (term != 0 && term[0] != 0)
+	return term;
+
+    {
+#ifndef HAVE_TTYENT_H
+	return UNKNOWN;
+#else
+	struct ttyent *t;
+	return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
+#endif
+    }
+}
+
+static void
+xgetstr(char *buf, int cnt, char *err)
+{
+        char ch;
+ 
+        do {
+                if (read(0, &ch, sizeof(ch)) != sizeof(ch))
+                        exit(1);
+                if (--cnt < 0) {
+                        fprintf(stderr, "%s too long\r\n", err);
+                        sleepexit(1);
+                }
+                *buf++ = ch;
+        } while (ch);
+}
+
+/*
+ * Some old rlogind's unknowingly pass remuser, locuser and
+ * terminal_type/speed so we need to take care of that part of the
+ * protocol here. Also, we can't make a getpeername(2) on the socket
+ * so we have to trust that rlogind resolved the name correctly.
+ */
+
+static int
+doremotelogin(char *host)
+{
+        int code;
+        char *cp;
+
+        xgetstr(rusername, sizeof (rusername), "remuser");
+        xgetstr(lusername, sizeof (lusername), "locuser");
+        xgetstr(term, sizeof(term), "Terminal type");
+	cp = strchr(term, '/');
+	if (cp != 0)
+		*cp = 0;	/* For now ignore speed/bg */
+        pwd = k_getpwnam(lusername);
+        if (pwd == NULL)
+                return(-1);
+        code = ruserok(host, (pwd->pw_uid == 0), rusername, lusername);
+	if (code == 0)
+	  syslog(LOG_NOTICE,
+		 "Warning: An old rlogind accepted login probably from host %s",
+		 host);
+	return(code);
+}
+ 
+void
+sleepexit(int eval)
+{
+
+	sleep(5);
+	exit(eval);
+}