Add customised version of login for picobsd images on -CURRENT.

This version is basically the same one as login.c 1.67, and does
not require the use of PAM.

4 files changed, 1167 insertions, 0 deletions

diff --git a/release/picobsd/tinyware/login/Makefile b/release/picobsd/tinyware/login/Makefile
new file mode 100644
index 0000000..2fe2b5e
--- /dev/null
+++ b/release/picobsd/tinyware/login/Makefile
@@ -0,0 +1,26 @@
+# From:	@(#)Makefile	8.1 (Berkeley) 7/19/93
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../../usr.bin/login
+
+PROG=	login
+SRCS=	pico-login.c login_access.c login_fbtab.c
+MAN=	login.1 login.access.5
+
+CFLAGS+=-DLOGIN_ACCESS -DLOGALL
+
+DPADD=	${LIBUTIL} ${LIBCRYPT}
+LDADD=	-lutil -lcrypt
+
+.if !defined(NOPAM)
+CFLAGS+= -DUSE_PAM
+DPADD+=	${LIBPAM}
+LDADD+=	${MINUSLPAM}
+.endif
+
+BINOWN=	root
+BINMODE=4555
+INSTALLFLAGS=-fschg
+NEED_LIBNAMES= yes
+
+.include <bsd.prog.mk>
diff --git a/release/picobsd/tinyware/login/README b/release/picobsd/tinyware/login/README
new file mode 100644
index 0000000..4dba334
--- /dev/null
+++ b/release/picobsd/tinyware/login/README
@@ -0,0 +1,6 @@
+$FreeBSD$
+
+This is a modified login version for PicoBSD purposes, which does
+not demand PAM.
+The "login.c" file is replaced by pico-login.c in this directory,
+the remaining files are taken from usr.bin/login/
diff --git a/release/picobsd/tinyware/login/pathnames.h b/release/picobsd/tinyware/login/pathnames.h
new file mode 100644
index 0000000..333c2ca
--- /dev/null
+++ b/release/picobsd/tinyware/login/pathnames.h
@@ -0,0 +1,43 @@
+/*-
+ * Copyright (c) 1989, 1993
+ *	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.
+ *
+ *	@(#)pathnames.h	8.1 (Berkeley) 6/9/93
+ * $FreeBSD$
+ */
+
+#include <paths.h>
+
+#define	_PATH_HUSHLOGIN		".hushlogin"
+#define	_PATH_MOTDFILE		"/etc/motd"
+#define _PATH_LOGACCESS		"/etc/login.access"
+#define _PATH_FBTAB		"/etc/fbtab"
+#define _PATH_LOGINDEVPERM	"/etc/logindevperm"
diff --git a/release/picobsd/tinyware/login/pico-login.c b/release/picobsd/tinyware/login/pico-login.c
new file mode 100644
index 0000000..a417d26
--- /dev/null
+++ b/release/picobsd/tinyware/login/pico-login.c
@@ -0,0 +1,1092 @@
+/*-
+ * 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.
+ */
+
+#if 0
+static char copyright[] =
+"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)login.c	8.4 (Berkeley) 4/2/94";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$
+#endif /* not lint */
+
+/*
+ * login [ name ]
+ * login -h hostname	(for telnetd, etc.)
+ * login -f name	(for pre-authenticated login: datakit, xterm, etc.)
+ */
+
+#include <sys/copyright.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/file.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <err.h>
+#include <errno.h>
+#include <grp.h>
+#include <libutil.h>
+#include <login_cap.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <ttyent.h>
+#include <unistd.h>
+#include <utmp.h>
+
+#ifdef USE_PAM
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+#include <sys/wait.h>
+#endif /* USE_PAM */
+
+#include "pathnames.h"
+
+/* wrapper for KAME-special getnameinfo() */
+#ifndef NI_WITHSCOPEID
+#define	NI_WITHSCOPEID	0
+#endif
+
+void	 badlogin __P((char *));
+void	 checknologin __P((void));
+void	 dolastlog __P((int));
+void	 getloginname __P((void));
+void	 motd __P((char *));
+int	 rootterm __P((char *));
+void	 sigint __P((int));
+void	 sleepexit __P((int));
+void	 refused __P((char *,char *,int));
+char	*stypeof __P((char *));
+void	 timedout __P((int));
+int	 login_access __P((char *, char *));
+void     login_fbtab __P((char *, uid_t, gid_t));
+
+#ifdef USE_PAM
+static int auth_pam __P((void));
+static int export_pam_environment __P((void));
+static int ok_to_export __P((const char *));
+
+static pam_handle_t *pamh = NULL;
+static char **environ_pam;
+
+#define PAM_END { \
+	if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \
+		syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); \
+	if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) \
+		syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); \
+	if ((e = pam_end(pamh, e)) != PAM_SUCCESS) \
+		syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); \
+}
+#endif
+
+static int auth_traditional __P((void));
+extern void login __P((struct utmp *));
+static void usage __P((void));
+
+#define	TTYGRPNAME	"tty"		/* name of group to own ttys */
+#define	DEFAULT_BACKOFF	3
+#define	DEFAULT_RETRIES	10
+#define	DEFAULT_PROMPT		"login: "
+#define	DEFAULT_PASSWD_PROMPT	"Password:"
+
+/*
+ * This bounds the time given to login.  Not a define so it can
+ * be patched on machines where it's too small.
+ */
+u_int	timeout = 300;
+
+/* Buffer for signal handling of timeout */
+jmp_buf timeout_buf;
+
+struct	passwd *pwd;
+int	failures;
+char	*term, *envinit[1], *hostname, *passwd_prompt, *prompt, *tty, *username;
+char    full_hostname[MAXHOSTNAMELEN];
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern char **environ;
+	struct group *gr;
+	struct stat st;
+	struct timeval tp;
+	struct utmp utmp;
+	int rootok, retries, backoff;
+	int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
+	int changepass;
+	time_t warntime;
+	uid_t uid, euid;
+	gid_t egid;
+	char *p, *ttyn;
+	char tbuf[MAXPATHLEN + 2];
+	char tname[sizeof(_PATH_TTY) + 10];
+	char *shell = NULL;
+	login_cap_t *lc = NULL;
+#ifdef USE_PAM
+	pid_t pid;
+	int e;
+#endif /* USE_PAM */
+
+	(void)signal(SIGQUIT, SIG_IGN);
+	(void)signal(SIGINT, SIG_IGN);
+	(void)signal(SIGHUP, SIG_IGN);
+	if (setjmp(timeout_buf)) {
+		if (failures)
+			badlogin(tbuf);
+		(void)fprintf(stderr, "Login timed out after %d seconds\n",
+		    timeout);
+		exit(0);
+	}
+	(void)signal(SIGALRM, timedout);
+	(void)alarm(timeout);
+	(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
+	 * -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
+	 */
+	*full_hostname = '\0';
+	term = NULL;
+
+	fflag = hflag = pflag = 0;
+	uid = getuid();
+	euid = geteuid();
+	egid = getegid();
+	while ((ch = getopt(argc, argv, "fh:p")) != -1)
+		switch (ch) {
+		case 'f':
+			fflag = 1;
+			break;
+		case 'h':
+			if (uid)
+				errx(1, "-h option: %s", strerror(EPERM));
+			hflag = 1;
+			if (strlcpy(full_hostname, optarg,
+			    sizeof(full_hostname)) >= sizeof(full_hostname))
+				errx(1, "-h option: %s: exceeds maximum "
+				    "hostname size", optarg);
+
+			trimdomain(optarg, UT_HOSTSIZE);
+
+			if (strlen(optarg) > UT_HOSTSIZE) {
+				struct addrinfo hints, *res;
+				int ga_err;
+				
+				memset(&hints, 0, sizeof(hints));
+				hints.ai_family = AF_UNSPEC;
+				ga_err = getaddrinfo(optarg, NULL, &hints,
+				    &res);
+				if (ga_err == 0) {
+					char hostbuf[MAXHOSTNAMELEN];
+
+					getnameinfo(res->ai_addr,
+					    res->ai_addrlen,
+					    hostbuf,
+					    sizeof(hostbuf), NULL, 0,
+					    NI_NUMERICHOST|
+					    NI_WITHSCOPEID);
+					optarg = strdup(hostbuf);
+					if (optarg == NULL) {
+						syslog(LOG_NOTICE,
+						    "strdup(): %m");
+						sleepexit(1);
+					}
+				} else
+					optarg = "invalid hostname";
+				if (res != NULL)
+					freeaddrinfo(res);
+			}
+			hostname = optarg;
+			break;
+		case 'p':
+			pflag = 1;
+			break;
+		case '?':
+		default:
+			if (!uid)
+				syslog(LOG_ERR, "invalid flag %c", ch);
+			usage();
+		}
+	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;
+	}
+	if ((tty = strrchr(ttyn, '/')) != NULL)
+		++tty;
+	else
+		tty = ttyn;
+
+	/*
+	 * Get "login-retries" & "login-backoff" from default class
+	 */
+	lc = login_getclass(NULL);
+	prompt = login_getcapstr(lc, "prompt", DEFAULT_PROMPT, DEFAULT_PROMPT);
+	passwd_prompt = login_getcapstr(lc, "passwd_prompt",
+	    DEFAULT_PASSWD_PROMPT, DEFAULT_PASSWD_PROMPT);
+	retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES,
+	    DEFAULT_RETRIES);
+	backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF,
+	    DEFAULT_BACKOFF);
+	login_close(lc);
+	lc = NULL;
+
+	for (cnt = 0;; ask = 1) {
+		if (ask) {
+			fflag = 0;
+			getloginname();
+		}
+		rootlogin = 0;
+		rootok = rootterm(tty); /* Default (auth may change) */
+
+		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);
+		}
+		(void)strlcpy(tbuf, username, sizeof(tbuf));
+
+		pwd = 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 != NULL) {
+			if (pwd->pw_uid == 0)
+				rootlogin = 1;
+
+			if (fflag && (uid == (uid_t)0 ||
+			    uid == (uid_t)pwd->pw_uid)) {
+				/* already authenticated */
+				break;
+			} else if (pwd->pw_passwd[0] == '\0') {
+				if (!rootlogin || rootok) {
+					/* pretend password okay */
+					rval = 0;
+					goto ttycheck;
+				}
+			}
+		}
+
+		fflag = 0;
+
+		(void)setpriority(PRIO_PROCESS, 0, -4);
+
+#ifdef USE_PAM
+		/*
+		 * Try to authenticate using PAM.  If a PAM system error
+		 * occurs, perhaps because of a botched configuration,
+		 * then fall back to using traditional Unix authentication.
+		 */
+		if ((rval = auth_pam()) == -1)
+#endif /* USE_PAM */
+			rval = auth_traditional();
+
+		(void)setpriority(PRIO_PROCESS, 0, 0);
+
+#ifdef USE_PAM
+		/*
+		 * PAM authentication may have changed "pwd" to the
+		 * entry for the template user.  Check again to see if
+		 * this is a root login after all.
+		 */
+		if (pwd != NULL && pwd->pw_uid == 0)
+			rootlogin = 1;
+#endif /* USE_PAM */
+
+	ttycheck:
+		/*
+		 * If trying to log in as root without Kerberos,
+		 * but with insecure terminal, refuse the login attempt.
+		 */
+		if (pwd && !rval) {
+			if (rootlogin && !rootok)
+				refused(NULL, "NOROOT", 0);
+			else	/* valid password & authenticated */
+				break;
+		}
+
+		(void)printf("Login incorrect\n");
+		failures++;
+
+		/*
+		 * we allow up to 'retry' (10) tries,
+		 * but after 'backoff' (3) we start backing off
+		 */
+		if (++cnt > backoff) {
+			if (cnt >= retries) {
+				badlogin(username);
+				sleepexit(1);
+			}
+			sleep((u_int)((cnt - backoff) * 5));
+		}
+	}
+
+	/* committed to login -- turn off timeout */
+	(void)alarm((u_int)0);
+	(void)signal(SIGHUP, SIG_DFL);
+
+	endpwent();
+
+	/*
+	 * Establish the login class.
+	 */
+	lc = login_getpwclass(pwd);
+
+	/* if user not super-user, check for disabled logins */
+	if (!rootlogin)
+		auth_checknologin(lc);
+
+	quietlog = login_getcapbool(lc, "hushlogin", 0);
+	/*
+	 * Switching needed for NFS with root access disabled.
+	 *
+	 * XXX: This change fails to modify the additional groups for the
+	 * process, and as such, may restrict rights normally granted
+	 * through those groups.
+	 */
+	(void)setegid(pwd->pw_gid);
+	(void)seteuid(rootlogin ? 0 : pwd->pw_uid);
+	if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
+		if (login_getcapbool(lc, "requirehome", 0))
+			refused("Home directory not available", "HOMEDIR", 1);
+		if (chdir("/") < 0) 
+			refused("Cannot find root directory", "ROOTDIR", 1);
+		if (!quietlog || *pwd->pw_dir)
+			printf("No home directory.\nLogging in with home = \"/\".\n");
+		pwd->pw_dir = "/";
+	}
+	(void)seteuid(euid);
+	(void)setegid(egid);
+	if (!quietlog)
+		quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
+
+	if (pwd->pw_change || pwd->pw_expire)
+		(void)gettimeofday(&tp, (struct timezone *)NULL);
+
+#define	DEFAULT_WARN  (2L * 7L * 86400L)  /* Two weeks */
+
+	warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN,
+	    DEFAULT_WARN);
+
+	if (pwd->pw_expire) {
+		if (tp.tv_sec >= pwd->pw_expire) {
+			refused("Sorry -- your account has expired", "EXPIRED",
+			    1);
+		} else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog)
+			(void)printf("Warning: your account expires on %s",
+			    ctime(&pwd->pw_expire));
+	}
+
+	warntime = login_getcaptime(lc, "warnpassword", DEFAULT_WARN,
+	    DEFAULT_WARN);
+
+	changepass = 0;
+	if (pwd->pw_change) {
+		if (tp.tv_sec >= pwd->pw_change) {
+			(void)printf("Sorry -- your password has expired.\n");
+			changepass = 1;
+			syslog(LOG_INFO, "%s Password expired - forcing change",
+			    pwd->pw_name);
+		} else if (pwd->pw_change - tp.tv_sec < warntime && !quietlog)
+			(void)printf("Warning: your password expires on %s",
+			    ctime(&pwd->pw_change));
+	}
+
+	if (lc != NULL) {
+		if (hostname) {
+			struct addrinfo hints, *res;
+			int ga_err;
+
+			memset(&hints, 0, sizeof(hints));
+			hints.ai_family = AF_UNSPEC;
+			ga_err = getaddrinfo(full_hostname, NULL, &hints,
+					     &res);
+			if (ga_err == 0) {
+				char hostbuf[MAXHOSTNAMELEN];
+
+				getnameinfo(res->ai_addr, res->ai_addrlen,
+				    hostbuf, sizeof(hostbuf), NULL, 0,
+				    NI_NUMERICHOST|NI_WITHSCOPEID);
+				if ((optarg = strdup(hostbuf)) == NULL) {
+					syslog(LOG_NOTICE, "strdup(): %m");
+					sleepexit(1);
+				}
+			} else
+				optarg = NULL;
+			if (res != NULL)
+				freeaddrinfo(res);
+			if (!auth_hostok(lc, full_hostname, optarg))
+				refused("Permission denied", "HOST", 1);
+		}
+
+		if (!auth_ttyok(lc, tty))
+			refused("Permission denied", "TTY", 1);
+
+		if (!auth_timeok(lc, time(NULL)))
+			refused("Logins not available right now", "TIME", 1);
+	}
+        shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
+	if (*pwd->pw_shell == '\0')
+		pwd->pw_shell = _PATH_BSHELL;
+	if (*shell == '\0')   /* Not overridden */
+		shell = pwd->pw_shell;
+	if ((shell = strdup(shell)) == NULL) {
+		syslog(LOG_NOTICE, "strdup(): %m");
+		sleepexit(1);
+	}
+
+#ifdef LOGIN_ACCESS
+	if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0)
+		refused("Permission denied", "ACCESS", 1);
+#endif /* LOGIN_ACCESS */
+
+	/* 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);
+
+	/*
+	 * 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);
+
+	/*
+	 * Clear flags of the tty.  None should be set, and when the
+	 * user sets them otherwise, this can cause the chown to fail.
+	 * Since it isn't clear that flags are useful on character
+	 * devices, we just clear them.
+	 */
+	if (chflags(ttyn, 0) && errno != EOPNOTSUPP)
+		syslog(LOG_ERR, "chmod(%s): %m", ttyn);
+	if (chown(ttyn, pwd->pw_uid,
+	    (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid))
+		syslog(LOG_ERR, "chmod(%s): %m", ttyn);
+
+
+	/*
+	 * Preserve TERM if it happens to be already set.
+	 */
+	if ((term = getenv("TERM")) != NULL) {
+		if ((term = strdup(term)) == NULL) {
+			syslog(LOG_NOTICE,
+			    "strdup(): %m");
+			sleepexit(1);
+		}
+	}
+
+	/*
+	 * Exclude cons/vt/ptys only, assume dialup otherwise
+	 * TODO: Make dialup tty determination a library call
+	 * for consistency (finger etc.)
+	 */
+	if (hostname==NULL && isdialuptty(tty))
+		syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
+
+#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 on %s as %s",
+		       full_hostname, tty, pwd->pw_name);
+	else
+		syslog(LOG_INFO, "login on %s as %s",
+		       tty, pwd->pw_name);
+#endif
+
+	/*
+	 * 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, full_hostname);
+		else
+			syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
+			    username, tty);
+	}
+
+	/*
+	 * Destroy environment unless user has requested its preservation.
+	 * We need to do this before setusercontext() because that may
+	 * set or reset some environment variables.
+	 */
+	if (!pflag)
+		environ = envinit;
+
+	/*
+	 * PAM modules might add supplementary groups during pam_setcred().
+	 */
+	if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
+                syslog(LOG_ERR, "setusercontext() failed - exiting");
+		exit(1);
+	}
+
+#ifdef USE_PAM
+	if (pamh) {
+		if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
+			syslog(LOG_ERR, "pam_open_session: %s",
+			    pam_strerror(pamh, e));
+		} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED))
+		    != PAM_SUCCESS) {
+			syslog(LOG_ERR, "pam_setcred: %s",
+			    pam_strerror(pamh, e));
+		}
+
+	        /*
+	         * Add any environmental variables that the
+	         * PAM modules may have set.
+		 * Call *after* opening session!
+		 */
+		if (pamh) {
+		  environ_pam = pam_getenvlist(pamh);
+		  if (environ_pam)
+			export_pam_environment();
+		}
+
+		/*
+		 * We must fork() before setuid() because we need to call
+		 * pam_close_session() as root.
+		 */
+		pid = fork();
+		if (pid < 0) {
+			err(1, "fork");
+			PAM_END;
+			exit(0);
+		} else if (pid) {
+			/* parent - wait for child to finish, then cleanup
+			   session */
+			wait(NULL);
+			PAM_END;
+			exit(0);
+		} else {
+			if ((e = pam_end(pamh, PAM_DATA_SILENT)) != PAM_SUCCESS)
+				syslog(LOG_ERR, "pam_end: %s",
+				    pam_strerror(pamh, e));
+		}
+	}
+#endif /* USE_PAM */
+
+	/*
+	 * We don't need to be root anymore, so
+	 * set the user and session context
+	 */
+	if (setlogin(username) != 0) {
+                syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
+		exit(1);
+	}
+	if (setusercontext(lc, pwd, pwd->pw_uid,
+	    LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETGROUP)) != 0) {
+                syslog(LOG_ERR, "setusercontext() failed - exiting");
+		exit(1);
+	}
+
+	(void)setenv("SHELL", pwd->pw_shell, 1);
+	(void)setenv("HOME", pwd->pw_dir, 1);
+	if (term != NULL && *term != '\0')
+		(void)setenv("TERM", term, 1);		/* Preset overrides */
+	else {
+		(void)setenv("TERM", stypeof(tty), 0);	/* Fallback doesn't */
+	}
+	(void)setenv("LOGNAME", username, 1);
+	(void)setenv("USER", username, 1);
+	(void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
+
+	if (!quietlog) {
+		char	*cw;
+
+		cw = login_getcapstr(lc, "copyright", NULL, NULL);
+		if (cw != NULL && access(cw, F_OK) == 0)
+			motd(cw);
+		else
+		    (void)printf("%s\n\t%s %s\n",
+	"Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
+	"The Regents of the University of California. ",
+	"All rights reserved.");
+
+		(void)printf("\n");
+
+		cw = login_getcapstr(lc, "welcome", NULL, NULL);
+		if (cw == NULL || access(cw, F_OK) != 0)
+			cw = _PATH_MOTDFILE;
+		motd(cw);
+
+		cw = getenv("MAIL");	/* $MAIL may have been set by class */
+		if (cw != NULL)
+			strlcpy(tbuf, cw, sizeof(tbuf));
+		else
+			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 " : "");
+	}
+
+	login_close(lc);
+
+	(void)signal(SIGALRM, SIG_DFL);
+	(void)signal(SIGQUIT, SIG_DFL);
+	(void)signal(SIGINT, SIG_DFL);
+	(void)signal(SIGTSTP, SIG_IGN);
+
+	/*
+	 * Login shells have a leading '-' in front of argv[0]
+	 */
+	if (snprintf(tbuf, sizeof(tbuf), "-%s",
+	    (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell) >=
+	    sizeof(tbuf)) {
+		syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size",
+		    username);
+		errx(1, "shell exceeds maximum pathname size");
+	}
+
+	execlp(shell, tbuf, (char *)0);
+	err(1, "%s", shell);
+}
+
+static int
+auth_traditional()
+{
+	int rval;
+	char *p;
+	char *ep;
+	char *salt;
+
+	rval = 1;
+	salt = pwd != NULL ? pwd->pw_passwd : "xx";
+
+	p = getpass(passwd_prompt);
+	ep = crypt(p, salt);
+
+	if (pwd) {
+		if (!p[0] && pwd->pw_passwd[0])
+			ep = ":";
+		if (strcmp(ep, pwd->pw_passwd) == 0)
+			rval = 0;
+	}
+
+	/* clear entered password */
+	memset(p, 0, strlen(p));
+	return rval;
+}
+
+#ifdef USE_PAM
+/*
+ * Attempt to authenticate the user using PAM.  Returns 0 if the user is
+ * authenticated, or 1 if not authenticated.  If some sort of PAM system
+ * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
+ * function returns -1.  This can be used as an indication that we should
+ * fall back to a different authentication mechanism.
+ */
+static int
+auth_pam()
+{
+	const char *tmpl_user;
+	const void *item;
+	int rval;
+	int e;
+	static struct pam_conv conv = { misc_conv, NULL };
+
+	if ((e = pam_start("login", username, &conv, &pamh)) != PAM_SUCCESS) {
+		syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
+		return -1;
+	}
+	if ((e = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS) {
+		syslog(LOG_ERR, "pam_set_item(PAM_TTY): %s",
+		    pam_strerror(pamh, e));
+		return -1;
+	}
+	if (hostname != NULL &&
+	    (e = pam_set_item(pamh, PAM_RHOST, full_hostname)) != PAM_SUCCESS) {
+		syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
+		    pam_strerror(pamh, e));
+		return -1;
+	}
+	e = pam_authenticate(pamh, 0);
+	switch (e) {
+
+	case PAM_SUCCESS:
+		/*
+		 * With PAM we support the concept of a "template"
+		 * user.  The user enters a login name which is
+		 * authenticated by PAM, usually via a remote service
+		 * such as RADIUS or TACACS+.  If authentication
+		 * succeeds, a different but related "template" name
+		 * is used for setting the credentials, shell, and
+		 * home directory.  The name the user enters need only
+		 * exist on the remote authentication server, but the
+		 * template name must be present in the local password
+		 * database.
+		 *
+		 * This is supported by two various mechanisms in the
+		 * individual modules.  However, from the application's
+		 * point of view, the template user is always passed
+		 * back as a changed value of the PAM_USER item.
+		 */
+		if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
+		    PAM_SUCCESS) {
+			tmpl_user = (const char *) item;
+			if (strcmp(username, tmpl_user) != 0)
+				pwd = getpwnam(tmpl_user);
+		} else
+			syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
+			    pam_strerror(pamh, e));
+		rval = 0;
+		break;
+
+	case PAM_AUTH_ERR:
+	case PAM_USER_UNKNOWN:
+	case PAM_MAXTRIES:
+		rval = 1;
+		break;
+
+	default:
+		syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
+		rval = -1;
+		break;
+	}
+
+	if (rval == 0) {
+		e = pam_acct_mgmt(pamh, 0);
+		if (e == PAM_NEW_AUTHTOK_REQD) {
+			e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
+			if (e != PAM_SUCCESS) {
+				syslog(LOG_ERR, "pam_chauthtok: %s",
+				    pam_strerror(pamh, e));
+				rval = 1;
+			}
+		} else if (e != PAM_SUCCESS) {
+			rval = 1;
+		}
+	}
+
+	if (rval != 0) {
+		if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
+			syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
+		}
+		pamh = NULL;
+	}
+	return rval;
+}
+
+static int
+export_pam_environment()
+{
+	char	**pp;
+
+	for (pp = environ_pam; *pp != NULL; pp++) {
+		if (ok_to_export(*pp))
+			(void) putenv(*pp);
+		free(*pp);
+	}
+	return PAM_SUCCESS;
+}
+
+/*
+ * Sanity checks on PAM environmental variables:
+ * - Make sure there is an '=' in the string.
+ * - Make sure the string doesn't run on too long.
+ * - Do not export certain variables.  This list was taken from the
+ *   Solaris pam_putenv(3) man page.
+ */
+static int
+ok_to_export(s)
+	const char *s;
+{
+	static const char *noexport[] = {
+		"SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
+		"IFS", "PATH", NULL
+	};
+	const char **pp;
+	size_t n;
+
+	if (strlen(s) > 1024 || strchr(s, '=') == NULL)
+		return 0;
+	if (strncmp(s, "LD_", 3) == 0)
+		return 0;
+	for (pp = noexport; *pp != NULL; pp++) {
+		n = strlen(*pp);
+		if (s[n] == '=' && strncmp(s, *pp, n) == 0)
+			return 0;
+	}
+	return 1;
+}
+#endif /* USE_PAM */
+
+static void
+usage()
+{
+
+	(void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n");
+	exit(1);
+}
+
+/*
+ * Allow for authentication style and/or kerberos instance
+ */
+
+#define	NBUFSIZ		UT_NAMESIZE + 64
+
+void
+getloginname()
+{
+	int ch;
+	char *p;
+	static char nbuf[NBUFSIZ];
+
+	for (;;) {
+		(void)printf("%s", prompt);
+		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] == '-')
+				(void)fprintf(stderr,
+				    "login names may not start with '-'.\n");
+			else {
+				*p = '\0';
+				username = nbuf;
+				break;
+			}
+		}
+	}
+}
+
+int
+rootterm(ttyn)
+	char *ttyn;
+{
+	struct ttyent *t;
+
+	return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
+}
+
+volatile int motdinterrupt;
+
+void
+sigint(signo)
+	int signo __unused;
+{
+	motdinterrupt = 1;
+}
+
+void
+motd(motdfile)
+	char *motdfile;
+{
+	int fd, nchars;
+	sig_t oldint;
+	char tbuf[256];
+
+	if ((fd = open(motdfile, O_RDONLY, 0)) < 0)
+		return;
+	motdinterrupt = 0;
+	oldint = signal(SIGINT, sigint);
+	while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt)
+		(void)write(fileno(stdout), tbuf, nchars);
+	(void)signal(SIGINT, oldint);
+	(void)close(fd);
+}
+
+/* ARGSUSED */
+void
+timedout(signo)
+	int signo;
+{
+
+	longjmp(timeout_buf, signo);
+}
+
+
+void
+dolastlog(quiet)
+	int quiet;
+{
+	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);
+	} else {
+		syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG);
+	}
+}
+
+void
+badlogin(name)
+	char *name;
+{
+
+	if (failures == 0)
+		return;
+	if (hostname) {
+		syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
+		    failures, failures > 1 ? "S" : "", full_hostname);
+		syslog(LOG_AUTHPRIV|LOG_NOTICE,
+		    "%d LOGIN FAILURE%s FROM %s, %s",
+		    failures, failures > 1 ? "S" : "", full_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);
+	}
+	failures = 0;
+}
+
+#undef	UNKNOWN
+#define	UNKNOWN	"su"
+
+char *
+stypeof(ttyid)
+	char *ttyid;
+{
+	struct ttyent *t;
+
+	if (ttyid != NULL && *ttyid != '\0') {
+		t = getttynam(ttyid);
+		if (t != NULL && t->ty_type != NULL)
+			return (t->ty_type);
+	}
+	return (UNKNOWN);
+}
+
+void
+refused(msg, rtype, lout)
+	char *msg;
+	char *rtype;
+	int lout;
+{
+
+	if (msg != NULL)
+	    printf("%s.\n", msg);
+	if (hostname)
+		syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s",
+		    pwd->pw_name, rtype, full_hostname, tty);
+	else
+		syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s",
+		    pwd->pw_name, rtype, tty);
+	if (lout)
+		sleepexit(1);
+}
+
+void
+sleepexit(eval)
+	int eval;
+{
+
+	(void)sleep(5);
+	exit(eval);
+}