--- old/usr/src/cmd/ssh/sshd/session.c	2016-08-16 20:42:30.075476571 -0400
+++ /dev/null	2016-08-16 20:42:30.000000000 -0400
@@ -1,2641 +0,0 @@
-/*
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- *                    All rights reserved
- *
- * As far as I am concerned, the code I have written for this software
- * can be used freely for any purpose.  Any derived versions of this
- * software must be clearly marked as such, and if the derived work is
- * incompatible with the protocol description in the RFC file, it must be
- * called by a name other than "ssh" or "Secure Shell".
- *
- * SSH2 support by Markus Friedl.
- * Copyright (c) 2000, 2001 Markus Friedl.  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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
- */
-/*
- * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.150 2002/09/16 19:55:33 stevesk Exp $");
-
-#ifdef HAVE_DEFOPEN
-#include <deflt.h>
-#include <ulimit.h>
-#endif /* HAVE_DEFOPEN */
-
-#ifdef HAVE_LIBGEN_H
-#include <libgen.h>
-#endif
-
-#include <priv.h>
-
-#include "ssh.h"
-#include "ssh1.h"
-#include "ssh2.h"
-#include "xmalloc.h"
-#include "sshpty.h"
-#include "packet.h"
-#include "buffer.h"
-#include "mpaux.h"
-#include "uidswap.h"
-#include "compat.h"
-#include "channels.h"
-#include "bufaux.h"
-#include "auth.h"
-#include "auth-options.h"
-#include "pathnames.h"
-#include "log.h"
-#include "servconf.h"
-#include "sshlogin.h"
-#include "serverloop.h"
-#include "canohost.h"
-#include "session.h"
-#include "tildexpand.h"
-#include "misc.h"
-#include "sftp.h"
-
-#ifdef USE_PAM
-#include <security/pam_appl.h>
-#endif /* USE_PAM */
-
-#ifdef GSSAPI
-#include "ssh-gss.h"
-#endif
-
-#ifdef ALTPRIVSEP
-#include "altprivsep.h"
-#endif /* ALTPRIVSEP */
-
-#ifdef HAVE_CYGWIN
-#include <windows.h>
-#include <sys/cygwin.h>
-#define is_winnt       (GetVersion() < 0x80000000)
-#endif
-
-/* func */
-
-Session *session_new(void);
-void	session_set_fds(Session *, int, int, int);
-void	session_pty_cleanup(void *);
-void	session_xauthfile_cleanup(void *s);
-void	session_proctitle(Session *);
-int	session_setup_x11fwd(Session *);
-void	do_exec_pty(Session *, const char *);
-void	do_exec_no_pty(Session *, const char *);
-void	do_exec(Session *, const char *);
-void	do_login(Session *, const char *);
-void	do_child(Session *, const char *);
-void	do_motd(void);
-int	check_quietlogin(Session *, const char *);
-
-static void do_authenticated1(Authctxt *);
-static void do_authenticated2(Authctxt *);
-
-static int  session_pty_req(Session *);
-static int  session_env_req(Session *s);
-static void session_free_env(char ***envp);
-static void safely_chroot(const char *path, uid_t uid);
-static void drop_privs(uid_t uid);
-
-#ifdef USE_PAM
-static void session_do_pam(Session *, int);
-#endif /* USE_PAM */
-
-/* import */
-extern ServerOptions options;
-extern char *__progname;
-extern int log_stderr;
-extern int debug_flag;
-extern u_int utmp_len;
-extern void destroy_sensitive_data(void);
-
-#ifdef GSSAPI
-extern Gssctxt *xxx_gssctxt;
-#endif /* GSSAPI */
-
-/* original command from peer. */
-const char *original_command = NULL;
-
-/* data */
-#define MAX_SESSIONS 10
-Session	sessions[MAX_SESSIONS];
-
-#define	SUBSYSTEM_NONE		0
-#define	SUBSYSTEM_EXT		1
-#define	SUBSYSTEM_INT_SFTP	2
-
-#ifdef HAVE_LOGIN_CAP
-login_cap_t *lc;
-#endif
-
-/* Name and directory of socket for authentication agent forwarding. */
-static char *auth_sock_name = NULL;
-static char *auth_sock_dir = NULL;
-
-/* removes the agent forwarding socket */
-
-static void
-auth_sock_cleanup_proc(void *_pw)
-{
-	struct passwd *pw = _pw;
-
-	if (auth_sock_name != NULL) {
-		temporarily_use_uid(pw);
-		unlink(auth_sock_name);
-		rmdir(auth_sock_dir);
-		auth_sock_name = NULL;
-		restore_uid();
-	}
-}
-
-static int
-auth_input_request_forwarding(struct passwd * pw)
-{
-	Channel *nc;
-	int sock;
-	struct sockaddr_un sunaddr;
-
-	if (auth_sock_name != NULL) {
-		error("authentication forwarding requested twice.");
-		return 0;
-	}
-
-	/* Temporarily drop privileged uid for mkdir/bind. */
-	temporarily_use_uid(pw);
-
-	/* Allocate a buffer for the socket name, and format the name. */
-	auth_sock_name = xmalloc(MAXPATHLEN);
-	auth_sock_dir = xmalloc(MAXPATHLEN);
-	strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
-
-	/* Create private directory for socket */
-	if (mkdtemp(auth_sock_dir) == NULL) {
-		packet_send_debug("Agent forwarding disabled: "
-		    "mkdtemp() failed: %.100s", strerror(errno));
-		restore_uid();
-		xfree(auth_sock_name);
-		xfree(auth_sock_dir);
-		auth_sock_name = NULL;
-		auth_sock_dir = NULL;
-		return 0;
-	}
-	snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
-		 auth_sock_dir, (long) getpid());
-
-	/* delete agent socket on fatal() */
-	fatal_add_cleanup(auth_sock_cleanup_proc, pw);
-
-	/* Create the socket. */
-	sock = socket(AF_UNIX, SOCK_STREAM, 0);
-	if (sock < 0)
-		packet_disconnect("socket: %.100s", strerror(errno));
-
-	/* Bind it to the name. */
-	memset(&sunaddr, 0, sizeof(sunaddr));
-	sunaddr.sun_family = AF_UNIX;
-	strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
-
-	if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
-		packet_disconnect("bind: %.100s", strerror(errno));
-
-	/* Restore the privileged uid. */
-	restore_uid();
-
-	/* Start listening on the socket. */
-	if (listen(sock, 5) < 0)
-		packet_disconnect("listen: %.100s", strerror(errno));
-
-	/* Allocate a channel for the authentication agent socket. */
-	nc = channel_new("auth socket",
-	    SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
-	    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
-	    0, xstrdup("auth socket"), 1);
-	strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
-	return 1;
-}
-
-
-void
-do_authenticated(Authctxt *authctxt)
-{
-	/* setup the channel layer */
-	if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
-		channel_permit_all_opens();
-
-	if (compat20)
-		do_authenticated2(authctxt);
-	else
-		do_authenticated1(authctxt);
-
-	/* remove agent socket */
-	if (auth_sock_name != NULL)
-		auth_sock_cleanup_proc(authctxt->pw);
-#ifdef KRB4
-	if (options.kerberos_ticket_cleanup)
-		krb4_cleanup_proc(authctxt);
-#endif
-#ifdef KRB5
-	if (options.kerberos_ticket_cleanup)
-		krb5_cleanup_proc(authctxt);
-#endif
-}
-
-/*
- * Prepares for an interactive session.  This is called after the user has
- * been successfully authenticated.  During this message exchange, pseudo
- * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
- * are requested, etc.
- */
-static void
-do_authenticated1(Authctxt *authctxt)
-{
-	Session *s;
-	char *command;
-	int success, type, screen_flag;
-	int enable_compression_after_reply = 0;
-	u_int proto_len, data_len, dlen, compression_level = 0;
-
-	s = session_new();
-	s->authctxt = authctxt;
-	s->pw = authctxt->pw;
-
-	/*
-	 * We stay in this loop until the client requests to execute a shell
-	 * or a command.
-	 */
-	for (;;) {
-		success = 0;
-
-		/* Get a packet from the client. */
-		type = packet_read();
-
-		/* Process the packet. */
-		switch (type) {
-		case SSH_CMSG_REQUEST_COMPRESSION:
-			compression_level = packet_get_int();
-			packet_check_eom();
-			if (compression_level < 1 || compression_level > 9) {
-				packet_send_debug("Received illegal compression level %d.",
-				    compression_level);
-				break;
-			}
-			if (!options.compression) {
-				debug2("compression disabled");
-				break;
-			}
-			/* Enable compression after we have responded with SUCCESS. */
-			enable_compression_after_reply = 1;
-			success = 1;
-			break;
-
-		case SSH_CMSG_REQUEST_PTY:
-			success = session_pty_req(s);
-			break;
-
-		case SSH_CMSG_X11_REQUEST_FORWARDING:
-			s->auth_proto = packet_get_string(&proto_len);
-			s->auth_data = packet_get_string(&data_len);
-
-			screen_flag = packet_get_protocol_flags() &
-			    SSH_PROTOFLAG_SCREEN_NUMBER;
-			debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
-
-			if (packet_remaining() == 4) {
-				if (!screen_flag)
-					debug2("Buggy client: "
-					    "X11 screen flag missing");
-				s->screen = packet_get_int();
-			} else {
-				s->screen = 0;
-			}
-			packet_check_eom();
-			success = session_setup_x11fwd(s);
-			if (!success) {
-				xfree(s->auth_proto);
-				xfree(s->auth_data);
-				s->auth_proto = NULL;
-				s->auth_data = NULL;
-			}
-			break;
-
-		case SSH_CMSG_AGENT_REQUEST_FORWARDING:
-			if (no_agent_forwarding_flag || compat13) {
-				debug("Authentication agent forwarding not permitted for this authentication.");
-				break;
-			}
-			debug("Received authentication agent forwarding request.");
-			success = auth_input_request_forwarding(s->pw);
-			break;
-
-		case SSH_CMSG_PORT_FORWARD_REQUEST:
-			if (no_port_forwarding_flag) {
-				debug("Port forwarding not permitted for this authentication.");
-				break;
-			}
-			if (!options.allow_tcp_forwarding) {
-				debug("Port forwarding not permitted.");
-				break;
-			}
-			debug("Received TCP/IP port forwarding request.");
-			channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
-			success = 1;
-			break;
-
-		case SSH_CMSG_MAX_PACKET_SIZE:
-			if (packet_set_maxsize(packet_get_int()) > 0)
-				success = 1;
-			break;
-
-#if defined(AFS) || defined(KRB5)
-		case SSH_CMSG_HAVE_KERBEROS_TGT:
-			if (!options.kerberos_tgt_passing) {
-				verbose("Kerberos TGT passing disabled.");
-			} else {
-				char *kdata = packet_get_string(&dlen);
-				packet_check_eom();
-
-				/* XXX - 0x41, see creds_to_radix version */
-				if (kdata[0] != 0x41) {
-#ifdef KRB5
-					krb5_data tgt;
-					tgt.data = kdata;
-					tgt.length = dlen;
-
-					if (auth_krb5_tgt(s->authctxt, &tgt))
-						success = 1;
-					else
-						verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
-#endif /* KRB5 */
-				} else {
-#ifdef AFS
-					if (auth_krb4_tgt(s->authctxt, kdata))
-						success = 1;
-					else
-						verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
-#endif /* AFS */
-				}
-				xfree(kdata);
-			}
-			break;
-#endif /* AFS || KRB5 */
-
-#ifdef AFS
-		case SSH_CMSG_HAVE_AFS_TOKEN:
-			if (!options.afs_token_passing || !k_hasafs()) {
-				verbose("AFS token passing disabled.");
-			} else {
-				/* Accept AFS token. */
-				char *token = packet_get_string(&dlen);
-				packet_check_eom();
-
-				if (auth_afs_token(s->authctxt, token))
-					success = 1;
-				else
-					verbose("AFS token refused for %.100s",
-					    s->authctxt->user);
-				xfree(token);
-			}
-			break;
-#endif /* AFS */
-
-		case SSH_CMSG_EXEC_SHELL:
-		case SSH_CMSG_EXEC_CMD:
-			if (type == SSH_CMSG_EXEC_CMD) {
-				command = packet_get_string(&dlen);
-				debug("Exec command '%.500s'", command);
-				do_exec(s, command);
-				xfree(command);
-			} else {
-				do_exec(s, NULL);
-			}
-			packet_check_eom();
-			session_close(s);
-			return;
-
-		default:
-			/*
-			 * Any unknown messages in this phase are ignored,
-			 * and a failure message is returned.
-			 */
-			log("Unknown packet type received after authentication: %d", type);
-		}
-		packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
-		packet_send();
-		packet_write_wait();
-
-		/* Enable compression now that we have replied if appropriate. */
-		if (enable_compression_after_reply) {
-			enable_compression_after_reply = 0;
-			packet_start_compression(compression_level);
-		}
-	}
-}
-
-/*
- * This is called to fork and execute a command when we have no tty.  This
- * will call do_child from the child, and server_loop from the parent after
- * setting up file descriptors and such.
- */
-void
-do_exec_no_pty(Session *s, const char *command)
-{
-	pid_t pid;
-
-	int inout[2], err[2];
-	/* Uses socket pairs to communicate with the program. */
-	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
-	    socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
-		packet_disconnect("Could not create socket pairs: %.100s",
-				  strerror(errno));
-	if (s == NULL)
-		fatal("do_exec_no_pty: no session");
-
-	session_proctitle(s);
-
-	/* Fork the child. */
-	if ((pid = fork()) == 0) {
-		fatal_remove_all_cleanups();
-
-		/* Child.  Reinitialize the log since the pid has changed. */
-		log_init(__progname, options.log_level, options.log_facility, log_stderr);
-
-		/*
-		 * Create a new session and process group since the 4.4BSD
-		 * setlogin() affects the entire process group.
-		 */
-		if (setsid() < 0)
-			error("setsid failed: %.100s", strerror(errno));
-
-		/*
-		 * Redirect stdin, stdout, and stderr.  Stdin and stdout will
-		 * use the same socket, as some programs (particularly rdist)
-		 * seem to depend on it.
-		 */
-		close(inout[1]);
-		close(err[1]);
-		if (dup2(inout[0], 0) < 0)	/* stdin */
-			perror("dup2 stdin");
-		if (dup2(inout[0], 1) < 0)	/* stdout.  Note: same socket as stdin. */
-			perror("dup2 stdout");
-		if (s->is_subsystem) {
-			/*
-			 * Redirect the subsystem's stderr to /dev/null. We might send it
-			 * over to the other side but changing that might break existing
-			 * SSH clients.
-			 */
-			close(err[0]);
-			if ((err[0] = open(_PATH_DEVNULL, O_WRONLY)) == -1)
-				fatal("Cannot open /dev/null: %.100s", strerror(errno));
-		} 
-		if (dup2(err[0], 2) < 0)	/* stderr */
-			perror("dup2 stderr");
-
-#ifdef _UNICOS
-		cray_init_job(s->pw); /* set up cray jid and tmpdir */
-#endif
-
-		/* Do processing for the child (exec command etc). */
-		do_child(s, command);
-		/* NOTREACHED */
-	}
-#ifdef _UNICOS
-	signal(WJSIGNAL, cray_job_termination_handler);
-#endif /* _UNICOS */
-#ifdef HAVE_CYGWIN
-	if (is_winnt)
-		cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
-#endif
-	if (pid < 0)
-		packet_disconnect("fork failed: %.100s", strerror(errno));
-
-	s->pid = pid;
-	/* Set interactive/non-interactive mode. */
-	packet_set_interactive(s->display != NULL);
-
-	/* We are the parent.  Close the child sides of the socket pairs. */
-	close(inout[0]);
-	close(err[0]);
-
-	/*
-	 * Enter the interactive session.  Note: server_loop must be able to
-	 * handle the case that fdin and fdout are the same.
-	 */
-	if (compat20) {
-		session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
-		if (s->is_subsystem)
-                        close(err[1]);
-		/* Don't close channel before sending exit-status! */
-		channel_set_wait_for_exit(s->chanid, 1);
-	} else {
-		server_loop(pid, inout[1], inout[1], err[1]);
-		/* server_loop has closed inout[1] and err[1]. */
-	}
-}
-
-/*
- * This is called to fork and execute a command when we have a tty.  This
- * will call do_child from the child, and server_loop from the parent after
- * setting up file descriptors, controlling tty, updating wtmp, utmp,
- * lastlog, and other such operations.
- */
-void
-do_exec_pty(Session *s, const char *command)
-{
-	int fdout, ptyfd, ttyfd, ptymaster, pipe_fds[2];
-	pid_t pid;
-
-	if (s == NULL)
-		fatal("do_exec_pty: no session");
-	ptyfd = s->ptyfd;
-	ttyfd = s->ttyfd;
-
-#ifdef USE_PAM
-	session_do_pam(s, 1);	/* pam_open_session() */
-#endif /* USE_PAM */
-
-	/*
-	 * This pipe lets sshd wait for child to exec or exit.  This is
-	 * particularly important for ALTPRIVSEP because the child is
-	 * the one to call the monitor to request a record_login() and
-	 * we don't want the child and the parent to compete for the
-	 * monitor's attention.  But this is generic code and doesn't
-	 * hurt to have here even if ALTPRIVSEP is not used.
-	 */
-	if (pipe(pipe_fds) != 0)
-		packet_disconnect("pipe failed: %.100s", strerror(errno));
-
-	(void) fcntl(pipe_fds[0], F_SETFD, FD_CLOEXEC);
-	(void) fcntl(pipe_fds[1], F_SETFD, FD_CLOEXEC);
-
-	/* Fork the child. */
-	if ((pid = fork()) == 0) {
-		(void) close(pipe_fds[0]);
-
-		fatal_remove_all_cleanups();
-
-		/* Child.  Reinitialize the log because the pid has changed. */
-		log_init(__progname, options.log_level, options.log_facility, log_stderr);
-		/* Close the master side of the pseudo tty. */
-		close(ptyfd);
-
-		/* Make the pseudo tty our controlling tty. */
-		pty_make_controlling_tty(&ttyfd, s->tty);
-
-		/* Redirect stdin/stdout/stderr from the pseudo tty. */
-		if (dup2(ttyfd, 0) < 0)
-			error("dup2 stdin: %s", strerror(errno));
-		if (dup2(ttyfd, 1) < 0)
-			error("dup2 stdout: %s", strerror(errno));
-		if (dup2(ttyfd, 2) < 0)
-			error("dup2 stderr: %s", strerror(errno));
-
-		/* Close the extra descriptor for the pseudo tty. */
-		close(ttyfd);
-
-		/* record login, etc. similar to login(1) */
-		do_login(s, command);
-
-		/*
-		 * Close the pipe to the parent so it can re-enter its event
-		 * loop and service the ptm; if enough debug messages get
-		 * written to the pty before this happens there will be a
-		 * deadlock.
-		 */
-		close(pipe_fds[1]);
-
-		/*
-		 * do_motd() was called originally in do_login(). However,
-		 * when the /etc/motd file is large, a deadlock would happen,
-		 * because
-		 * - The child is blocked at fputs() to pty, when pty buffer
-		 *   is full.
-		 * - The parent can not consume the pty buffer, because it is
-		 *   still blocked at read(pipe_fds[0]).
-		 *
-		 * To resolve the deadlock issue, we defer do_motd() after
-		 * close(pipe_fds[1]).
-		 */
-		do_motd();
-
-		/* Do common processing for the child, such as execing the command. */
-		do_child(s, command);
-		/* NOTREACHED */
-	}
-
-	/* Wait for child to exec() or exit() */
-	(void) close(pipe_fds[1]);
-	(void) read(pipe_fds[0], &pipe_fds[1], sizeof(int));
-
-#ifdef _UNICOS
-	signal(WJSIGNAL, cray_job_termination_handler);
-#endif /* _UNICOS */
-#ifdef HAVE_CYGWIN
-	if (is_winnt)
-		cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
-#endif
-	if (pid < 0)
-		packet_disconnect("fork failed: %.100s", strerror(errno));
-	s->pid = pid;
-
-	/* Parent.  Close the slave side of the pseudo tty. */
-	close(ttyfd);
-
-	/*
-	 * Create another descriptor of the pty master side for use as the
-	 * standard input.  We could use the original descriptor, but this
-	 * simplifies code in server_loop.  The descriptor is bidirectional.
-	 */
-	fdout = dup(ptyfd);
-	if (fdout < 0)
-		packet_disconnect("dup #1 failed: %.100s", strerror(errno));
-
-	/* we keep a reference to the pty master */
-	ptymaster = dup(ptyfd);
-	if (ptymaster < 0)
-		packet_disconnect("dup #2 failed: %.100s", strerror(errno));
-	s->ptymaster = ptymaster;
-
-	/* Enter interactive session. */
-	packet_set_interactive(1);
-	if (compat20) {
-		session_set_fds(s, ptyfd, fdout, -1);
-		/* Don't close channel before sending exit-status! */
-		channel_set_wait_for_exit(s->chanid, 1);
-	} else {
-		server_loop(pid, ptyfd, fdout, -1);
-		/* server_loop _has_ closed ptyfd and fdout. */
-	}
-}
-
-/*
- * This is called to fork and execute a command.  If another command is
- * to be forced, execute that instead.
- */
-void
-do_exec(Session *s, const char *command)
-{
-	if (command)
-		s->command = xstrdup(command);
-
-	if (forced_command) {
-		original_command = command;
-		command = forced_command;
-		debug("Forced command '%.900s'", command);
-	}
-
-	if (s->ttyfd != -1)
-		do_exec_pty(s, command);
-	else
-		do_exec_no_pty(s, command);
-
-	original_command = NULL;
-}
-
-
-/* administrative, login(1)-like work */
-void
-do_login(Session *s, const char *command)
-{
-	char *time_string;
-#ifndef ALTPRIVSEP
-	struct passwd * pw = s->pw;
-#endif /* ALTPRIVSEP*/
-	pid_t pid = getpid();
-
-	/* Record that there was a login on that tty from the remote host. */
-#ifdef ALTPRIVSEP
-	debug3("Recording SSHv2 channel login in utmpx/wtmpx");
-	altprivsep_record_login(pid, s->tty);
-#endif /* ALTPRIVSEP*/
-
-	if (check_quietlogin(s, command))
-		return;
-
-#ifdef USE_PAM
-		print_pam_messages();
-#endif /* USE_PAM */
-#ifdef WITH_AIXAUTHENTICATE
-	if (aixloginmsg && *aixloginmsg)
-		printf("%s\n", aixloginmsg);
-#endif /* WITH_AIXAUTHENTICATE */
-
-#ifndef NO_SSH_LASTLOG
-	if (options.print_lastlog && s->last_login_time != 0) {
-		time_string = ctime(&s->last_login_time);
-		if (strchr(time_string, '\n'))
-			*strchr(time_string, '\n') = 0;
-		if (strcmp(s->hostname, "") == 0)
-			printf("Last login: %s\r\n", time_string);
-		else
-			printf("Last login: %s from %s\r\n", time_string,
-			    s->hostname);
-	}
-#endif /* NO_SSH_LASTLOG */
-
-}
-
-/*
- * Display the message of the day.
- */
-void
-do_motd(void)
-{
-	FILE *f;
-	char buf[256];
-
-	if (options.print_motd) {
-#ifdef HAVE_LOGIN_CAP
-		f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
-		    "/etc/motd"), "r");
-#else
-		f = fopen("/etc/motd", "r");
-#endif
-		if (f) {
-			while (fgets(buf, sizeof(buf), f))
-				fputs(buf, stdout);
-			fclose(f);
-		}
-	}
-}
-
-
-/*
- * Check for quiet login, either .hushlogin or command given.
- */
-int
-check_quietlogin(Session *s, const char *command)
-{
-	char buf[256];
-	struct passwd *pw = s->pw;
-	struct stat st;
-
-	/* Return 1 if .hushlogin exists or a command given. */
-	if (command != NULL)
-		return 1;
-	snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
-#ifdef HAVE_LOGIN_CAP
-	if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
-		return 1;
-#else
-	if (stat(buf, &st) >= 0)
-		return 1;
-#endif
-	return 0;
-}
-
-/*
- * Sets the value of the given variable in the environment.  If the variable
- * already exists, its value is overriden.
- */
-void
-child_set_env(char ***envp, u_int *envsizep, const char *name,
-	const char *value)
-{
-	debug3("child_set_env(%s, %s)", name, value);
-	child_set_env_silent(envp, envsizep, name, value);
-}
-
-
-void
-child_set_env_silent(char ***envp, u_int *envsizep, const char *name,
-	const char *value)
-{
-	u_int i, namelen;
-	char **env;
-
-	/*
-	 * Find the slot where the value should be stored.  If the variable
-	 * already exists, we reuse the slot; otherwise we append a new slot
-	 * at the end of the array, expanding if necessary.
-	 */
-	env = *envp;
-	namelen = strlen(name);
-	for (i = 0; env[i]; i++)
-		if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
-			break;
-	if (env[i]) {
-		/* Reuse the slot. */
-		xfree(env[i]);
-	} else {
-		/* New variable.  Expand if necessary. */
-		if (i >= (*envsizep) - 1) {
-			if (*envsizep >= 1000)
-				fatal("child_set_env: too many env vars,"
-				    " skipping: %.100s", name);
-			(*envsizep) += 50;
-			env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
-		}
-		/* Need to set the NULL pointer at end of array beyond the new slot. */
-		env[i + 1] = NULL;
-	}
-
-	/* Allocate space and format the variable in the appropriate slot. */
-	env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
-	snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
-}
-
-/*
- * Reads environment variables from the given file and adds/overrides them
- * into the environment.  If the file does not exist, this does nothing.
- * Otherwise, it must consist of empty lines, comments (line starts with '#')
- * and assignments of the form name=value.  No other forms are allowed.
- */
-static void
-read_environment_file(char ***env, u_int *envsize,
-	const char *filename)
-{
-	FILE *f;
-	char buf[4096];
-	char *cp, *value;
-	u_int lineno = 0;
-
-	f = fopen(filename, "r");
-	if (!f)
-		return;
-
-	while (fgets(buf, sizeof(buf), f)) {
-		if (++lineno > 1000)
-			fatal("Too many lines in environment file %s", filename);
-		for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
-			;
-		if (!*cp || *cp == '#' || *cp == '\n')
-			continue;
-		if (strchr(cp, '\n'))
-			*strchr(cp, '\n') = '\0';
-		value = strchr(cp, '=');
-		if (value == NULL) {
-			fprintf(stderr, gettext("Bad line %u in %.100s\n"),
-				lineno, filename);
-			continue;
-		}
-		/*
-		 * Replace the equals sign by nul, and advance value to
-		 * the value string.
-		 */
-		*value = '\0';
-		value++;
-		child_set_env(env, envsize, cp, value);
-	}
-	fclose(f);
-}
-
-void copy_environment(char **source, char ***env, u_int *envsize)
-{
-	char *var_name, *var_val;
-	int i;
-
-	if (source == NULL)
-		return;
-
-	for(i = 0; source[i] != NULL; i++) {
-		var_name = xstrdup(source[i]);
-		if ((var_val = strstr(var_name, "=")) == NULL) {
-			xfree(var_name);
-			continue;
-		}
-		*var_val++ = '\0';
-
-		debug3("Copy environment: %s=%s", var_name, var_val);
-		child_set_env(env, envsize, var_name, var_val);
-		
-		xfree(var_name);
-	}
-}
-
-#ifdef HAVE_DEFOPEN
-static
-void
-deflt_do_setup_env(Session *s, const char *shell, char ***env, u_int *envsize)
-{
-	int	flags;
-	char	*ptr;
-	mode_t	Umask = 022;
-
-	if (defopen(_PATH_DEFAULT_LOGIN))
-		return;
-
-	/* Ignore case */
-	flags = defcntl(DC_GETFLAGS, 0);
-	TURNOFF(flags, DC_CASE);
-	(void) defcntl(DC_SETFLAGS, flags);
-
-	/* TZ & HZ */
-	if ((ptr = defread("TIMEZONE=")) != NULL)
-		child_set_env(env, envsize, "TZ", ptr);
-	if ((ptr = defread("HZ=")) != NULL)
-		child_set_env(env, envsize, "HZ", ptr);
-
-	/* PATH */
-	if (s->pw->pw_uid != 0 && (ptr = defread("PATH=")) != NULL)
-		child_set_env(env, envsize, "PATH", ptr);
-	if (s->pw->pw_uid == 0 && (ptr = defread("SUPATH=")) != NULL)
-		child_set_env(env, envsize, "PATH", ptr);
-
-	/* SHELL */
-	if ((ptr = defread("ALTSHELL=")) != NULL) {
-		if (strcasecmp("YES", ptr) == 0)
-			child_set_env(env, envsize, "SHELL", shell);
-		else
-			child_set_env(env, envsize, "SHELL", "");
-	}
-
-	/* UMASK */
-	if ((ptr = defread("UMASK=")) != NULL &&
-	    sscanf(ptr, "%lo", &Umask) == 1 &&
-	    Umask <= (mode_t)0777)
-		(void) umask(Umask);
-	else
-		(void) umask(022);
-
-	/* ULIMIT */
-	if ((ptr = defread("ULIMIT=")) != NULL && atol(ptr) > 0L &&
-	    ulimit(UL_SETFSIZE, atol(ptr)) < 0L)
-		error("Could not set ULIMIT to %ld from %s\n", atol(ptr),
-			_PATH_DEFAULT_LOGIN);
-
-	(void) defopen(NULL);
-}
-#endif /* HAVE_DEFOPEN */
-
-static char **
-do_setup_env(Session *s, const char *shell)
-{
-	char buf[256];
-	char path_maildir[] = _PATH_MAILDIR;
-	u_int i, envsize, pm_len;
-	char **env;
-	struct passwd *pw = s->pw;
-
-	/* Initialize the environment. */
-	envsize = 100;
-	env = xmalloc(envsize * sizeof(char *));
-	env[0] = NULL;
-
-#ifdef HAVE_CYGWIN
-	/*
-	 * The Windows environment contains some setting which are
-	 * important for a running system. They must not be dropped.
-	 */
-	copy_environment(environ, &env, &envsize);
-#endif
-
-#ifdef GSSAPI
-	/* Allow any GSSAPI methods that we've used to alter 
-	 * the childs environment as they see fit
-	 */
-	ssh_gssapi_do_child(xxx_gssctxt, &env,&envsize);
-#endif
-
-	/* Set basic environment. */
-	child_set_env(&env, &envsize, "USER", pw->pw_name);
-	child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
-	child_set_env(&env, &envsize, "HOME", pw->pw_dir);
-#ifdef HAVE_LOGIN_CAP
-	if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
-		child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
-	else
-		child_set_env(&env, &envsize, "PATH", getenv("PATH"));
-#else /* HAVE_LOGIN_CAP */
-# ifndef HAVE_CYGWIN
-	/*
-	 * There's no standard path on Windows. The path contains
-	 * important components pointing to the system directories,
-	 * needed for loading shared libraries. So the path better
-	 * remains intact here.
-	 */
-#  ifdef SUPERUSER_PATH
-	child_set_env(&env, &envsize, "PATH", 
-	    s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
-#  else 
-	child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
-#  endif /* SUPERUSER_PATH */
-# endif /* HAVE_CYGWIN */
-#endif /* HAVE_LOGIN_CAP */
-
-	pm_len = strlen(path_maildir);
-	if (path_maildir[pm_len - 1] == '/' && pm_len > 1)
-		path_maildir[pm_len - 1] = NULL;
-	snprintf(buf, sizeof buf, "%.200s/%.50s",
-		 path_maildir, pw->pw_name);
-	child_set_env(&env, &envsize, "MAIL", buf);
-
-	/* Normal systems set SHELL by default. */
-	child_set_env(&env, &envsize, "SHELL", shell);
-
-#ifdef HAVE_DEFOPEN
-	deflt_do_setup_env(s, shell, &env, &envsize);
-#endif /* HAVE_DEFOPEN */
-
-#define PASS_ENV(x) \
-	if (getenv(x)) \
-		child_set_env(&env, &envsize, x, getenv(x));
-
-	if (getenv("TZ"))
-		child_set_env(&env, &envsize, "TZ", getenv("TZ"));
-
-	if (s->auth_file != NULL)
-		child_set_env(&env, &envsize, "XAUTHORITY", s->auth_file);
-
-	PASS_ENV("LANG")
-	PASS_ENV("LC_ALL")
-	PASS_ENV("LC_CTYPE")
-	PASS_ENV("LC_COLLATE")
-	PASS_ENV("LC_TIME")
-	PASS_ENV("LC_NUMERIC")
-	PASS_ENV("LC_MONETARY")
-	PASS_ENV("LC_MESSAGES")
-
-#undef PASS_ENV
-
-	if (s->env != NULL)
-		copy_environment(s->env, &env, &envsize);
-
-	/* Set custom environment options from RSA authentication. */
-	while (custom_environment) {
-		struct envstring *ce = custom_environment;
-		char *str = ce->s;
-
-		for (i = 0; str[i] != '=' && str[i]; i++)
-			;
-		if (str[i] == '=') {
-			str[i] = 0;
-			child_set_env(&env, &envsize, str, str + i + 1);
-		}
-		custom_environment = ce->next;
-		xfree(ce->s);
-		xfree(ce);
-	}
-
-	/* SSH_CLIENT deprecated */
-	snprintf(buf, sizeof buf, "%.50s %d %d",
-	    get_remote_ipaddr(), get_remote_port(), get_local_port());
-	child_set_env(&env, &envsize, "SSH_CLIENT", buf);
-
-	snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
-	    get_remote_ipaddr(), get_remote_port(),
-	    get_local_ipaddr(packet_get_connection_in()), get_local_port());
-	child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
-
-	if (s->ttyfd != -1)
-		child_set_env(&env, &envsize, "SSH_TTY", s->tty);
-	if (s->term)
-		child_set_env(&env, &envsize, "TERM", s->term);
-	if (s->display)
-		child_set_env(&env, &envsize, "DISPLAY", s->display);
-	if (original_command)
-		child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
-		    original_command);
-
-#ifdef _UNICOS
-	if (cray_tmpdir[0] != '\0')
-		child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
-#endif /* _UNICOS */
-
-#ifdef _AIX
-	{
-		char *cp;
-
-		if ((cp = getenv("AUTHSTATE")) != NULL)
-			child_set_env(&env, &envsize, "AUTHSTATE", cp);
-		if ((cp = getenv("KRB5CCNAME")) != NULL)
-			child_set_env(&env, &envsize, "KRB5CCNAME", cp);
-		read_environment_file(&env, &envsize, "/etc/environment");
-	}
-#endif
-#ifdef KRB4
-	if (s->authctxt->krb4_ticket_file)
-		child_set_env(&env, &envsize, "KRBTKFILE",
-		    s->authctxt->krb4_ticket_file);
-#endif
-#ifdef KRB5
-	if (s->authctxt->krb5_ticket_file)
-		child_set_env(&env, &envsize, "KRB5CCNAME",
-		    s->authctxt->krb5_ticket_file);
-#endif
-#ifdef USE_PAM
-	/*
-	 * Pull in any environment variables that may have
-	 * been set by PAM.
-	 */
-	{
-		char **p;
-
-		p = fetch_pam_environment(s->authctxt);
-		copy_environment(p, &env, &envsize);
-		free_pam_environment(p);
-	}
-#endif /* USE_PAM */
-
-	if (auth_sock_name != NULL)
-		child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
-		    auth_sock_name);
-
-	/* read $HOME/.ssh/environment. */
-	if (options.permit_user_env) {
-		snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
-		    strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
-		read_environment_file(&env, &envsize, buf);
-	}
-	if (debug_flag) {
-		/* dump the environment */
-		fprintf(stderr, gettext("Environment:\n"));
-		for (i = 0; env[i]; i++)
-			fprintf(stderr, "  %.200s\n", env[i]);
-	}
-	return env;
-}
-
-/*
- * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
- * first in this order).
- */
-static void
-do_rc_files(Session *s, const char *shell)
-{
-	FILE *f = NULL;
-	char cmd[1024];
-	int do_xauth;
-	struct stat st;
-
-	do_xauth =
-	    s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
-
-	/* ignore _PATH_SSH_USER_RC for subsystems */
-	if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
-		snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
-		    shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
-		if (debug_flag)
-			fprintf(stderr, "Running %s\n", cmd);
-		f = popen(cmd, "w");
-		if (f) {
-			if (do_xauth)
-				fprintf(f, "%s %s\n", s->auth_proto,
-				    s->auth_data);
-			pclose(f);
-		} else
-			fprintf(stderr, "Could not run %s\n",
-			    _PATH_SSH_USER_RC);
-	} else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
-		if (debug_flag)
-			fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
-			    _PATH_SSH_SYSTEM_RC);
-		f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
-		if (f) {
-			if (do_xauth)
-				fprintf(f, "%s %s\n", s->auth_proto,
-				    s->auth_data);
-			pclose(f);
-		} else
-			fprintf(stderr, "Could not run %s\n",
-			    _PATH_SSH_SYSTEM_RC);
-	} else if (do_xauth && options.xauth_location != NULL) {
-		/* Add authority data to .Xauthority if appropriate. */
-		if (debug_flag) {
-			fprintf(stderr,
-			    "Running %.500s add "
-			    "%.100s %.100s %.100s\n",
-			    options.xauth_location, s->auth_display,
-			    s->auth_proto, s->auth_data);
-		}
-		snprintf(cmd, sizeof cmd, "%s -q -",
-		    options.xauth_location);
-		f = popen(cmd, "w");
-		if (f) {
-			fprintf(f, "add %s %s %s\n",
-			    s->auth_display, s->auth_proto,
-			    s->auth_data);
-			pclose(f);
-		} else {
-			fprintf(stderr, "Could not run %s\n",
-			    cmd);
-		}
-	}
-}
-
-/* Disallow logins if /etc/nologin exists. This does not apply to root. */
-static void
-do_nologin(struct passwd *pw)
-{
-	FILE *f = NULL;
-	char buf[1024];
-	struct stat sb;
-
-	if (pw->pw_uid == 0)
-		return;
-
-	if (stat(_PATH_NOLOGIN, &sb) == -1)
-	       return;
-
-	/* /etc/nologin exists.  Print its contents if we can and exit. */
-	log("User %.100s not allowed because %s exists.", pw->pw_name,
-	    _PATH_NOLOGIN);
-	if ((f = fopen(_PATH_NOLOGIN, "r")) != NULL) {
-		while (fgets(buf, sizeof(buf), f))
-			fputs(buf, stderr);
-		fclose(f);
-	}
-	exit(254);
-}
-
-/* Chroot into ChrootDirectory if the option is set. */
-void
-chroot_if_needed(struct passwd *pw)
-{
-	char *chroot_path, *tmp;
-
-	if (chroot_requested(options.chroot_directory)) {
-		tmp = tilde_expand_filename(options.chroot_directory,
-		    pw->pw_uid);
-		chroot_path = percent_expand(tmp, "h", pw->pw_dir,
-		    "u", pw->pw_name, (char *)NULL);
-		safely_chroot(chroot_path, pw->pw_uid);
-		free(tmp);
-		free(chroot_path);
-	}
-}
-
-/*
- * Chroot into a directory after checking it for safety: all path components
- * must be root-owned directories with strict permissions.
- */
-static void
-safely_chroot(const char *path, uid_t uid)
-{
-	const char *cp;
-	char component[MAXPATHLEN];
-	struct stat st;
-
-	if (*path != '/')
-		fatal("chroot path does not begin at root");
-	if (strlen(path) >= sizeof(component))
-		fatal("chroot path too long");
-
-	/*
-	 * Descend the path, checking that each component is a
-	 * root-owned directory with strict permissions.
-	 */
-	for (cp = path; cp != NULL;) {
-		if ((cp = strchr(cp, '/')) == NULL)
-			strlcpy(component, path, sizeof(component));
-		else {
-			cp++;
-			memcpy(component, path, cp - path);
-			component[cp - path] = '\0';
-		}
-	
-		debug3("%s: checking '%s'", __func__, component);
-
-		if (stat(component, &st) != 0)
-			fatal("%s: stat(\"%s\"): %s", __func__,
-			    component, strerror(errno));
-		if (st.st_uid != 0 || (st.st_mode & 022) != 0)
-			fatal("bad ownership or modes for chroot "
-			    "directory %s\"%s\"", 
-			    cp == NULL ? "" : "component ", component);
-		if (!S_ISDIR(st.st_mode))
-			fatal("chroot path %s\"%s\" is not a directory",
-			    cp == NULL ? "" : "component ", component);
-	}
-
-	if (chdir(path) == -1)
-		fatal("Unable to chdir to chroot path \"%s\": "
-		    "%s", path, strerror(errno));
-	if (chroot(path) == -1)
-		fatal("chroot(\"%s\"): %s", path, strerror(errno));
-	if (chdir("/") == -1)
-		fatal("%s: chdir(/) after chroot: %s",
-		    __func__, strerror(errno));
-	verbose("Changed root directory to \"%s\"", path);
-}
-
-static void
-launch_login(struct passwd *pw, const char *hostname)
-{
-	/* Launch login(1). */
-
-	execl(LOGIN_PROGRAM, "login", "-h", hostname,
-#ifdef xxxLOGIN_NEEDS_TERM
-		    (s->term ? s->term : "unknown"),
-#endif /* LOGIN_NEEDS_TERM */
-#ifdef LOGIN_NO_ENDOPT
-	    "-p", "-f", pw->pw_name, (char *)NULL);
-#else
-	    "-p", "-f", "--", pw->pw_name, (char *)NULL);
-#endif
-
-	/* Login couldn't be executed, die. */
-
-	perror("login");
-	exit(1);
-}
-
-/*
- * Performs common processing for the child, such as setting up the
- * environment, closing extra file descriptors, setting the user and group
- * ids, and executing the command or shell.
- */
-#define ARGV_MAX 10
-void
-do_child(Session *s, const char *command)
-{
-	extern char **environ;
-	char **env;
-	char *argv[ARGV_MAX];
-	const char *shell, *shell0;
-	struct passwd *pw = s->pw;
-
-	/* remove hostkey from the child's memory */
-	destroy_sensitive_data();
-
-	do_nologin(pw);
-	chroot_if_needed(pw);
-
-	/*
-	 * Get the shell from the password data.  An empty shell field is
-	 * legal, and means /bin/sh.
-	 */
-	shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
-#ifdef HAVE_LOGIN_CAP
-	shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
-#endif
-
-	env = do_setup_env(s, shell);
-
-	/*
-	 * Close the connection descriptors; note that this is the child, and
-	 * the server will still have the socket open, and it is important
-	 * that we do not shutdown it.  Note that the descriptors cannot be
-	 * closed before building the environment, as we call
-	 * get_remote_ipaddr there.
-	 */
-	if (packet_get_connection_in() == packet_get_connection_out())
-		close(packet_get_connection_in());
-	else {
-		close(packet_get_connection_in());
-		close(packet_get_connection_out());
-	}
-	/*
-	 * Close all descriptors related to channels.  They will still remain
-	 * open in the parent.
-	 */
-	/* XXX better use close-on-exec? -markus */
-	channel_close_all();
-
-	/*
-	 * Close any extra file descriptors.  Note that there may still be
-	 * descriptors left by system functions.  They will be closed later.
-	 */
-	endpwent();
-
-	/*
-	 * Must switch to the new environment variables so that .ssh/rc,
-	 * /etc/ssh/sshrc, and xauth are run in the proper environment.
-	 */
-	environ = env;
-
-	/*
-	 * New environment has been installed. We need to update locale
-	 * so that error messages beyond this point have the proper
-	 * character encoding.
-	 */
-	(void) setlocale(LC_ALL, ""); 
-
-	/*
-	 * Close any extra open file descriptors so that we don\'t have them
-	 * hanging around in clients.  Note that we want to do this after
-	 * initgroups, because at least on Solaris 2.3 it leaves file
-	 * descriptors open.
-	 */
-	closefrom(STDERR_FILENO + 1);
-
-#ifdef AFS
-	/* Try to get AFS tokens for the local cell. */
-	if (k_hasafs()) {
-		char cell[64];
-
-		if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
-			krb_afslog(cell, 0);
-
-		krb_afslog(0, 0);
-	}
-#endif /* AFS */
-
-	/* Change current directory to the user's home directory. */
-	if (chdir(pw->pw_dir) < 0) {
-		/* Suppress missing homedir warning for chroot case */
-		if (!chroot_requested(options.chroot_directory))
-			fprintf(stderr, "Could not chdir to home "
-			    "directory %s: %s\n", pw->pw_dir,
-			    strerror(errno));
-	}
-
-	do_rc_files(s, shell);
-
-	/* restore SIGPIPE for child */
-	signal(SIGPIPE,  SIG_DFL);
-
-	if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
-		int i;
-		char *p, *args;
-		extern int optind, optreset;
-
-		/* This will set the E/P sets here, simulating exec(2). */
-		drop_privs(pw->pw_uid);
-
-		setproctitle("%s@internal-sftp-server", s->pw->pw_name);
-		args = xstrdup(command ? command : "sftp-server");
-
-		i = 0;
-		for ((p = strtok(args, " ")); p != NULL; (p = strtok(NULL, " "))) {
-			if (i < ARGV_MAX - 1)
-				argv[i++] = p;
-		}
-
-		argv[i] = NULL;
-		optind = optreset = 1;
-		__progname = argv[0];
-		exit(sftp_server_main(i, argv, s->pw));
-	}
-
-	/* Get the last component of the shell name. */
-	if ((shell0 = strrchr(shell, '/')) != NULL)
-		shell0++;
-	else
-		shell0 = shell;
-
-	/*
-	 * If we have no command, execute the shell.  In this case, the shell
-	 * name to be passed in argv[0] is preceded by '-' to indicate that
-	 * this is a login shell.
-	 */
-	if (!command) {
-		char argv0[256];
-
-		/* Start the shell.  Set initial character to '-'. */
-		argv0[0] = '-';
-
-		if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
-		    >= sizeof(argv0) - 1) {
-			errno = EINVAL;
-			perror(shell);
-			exit(1);
-		}
-
-		/* Execute the shell. */
-		argv[0] = argv0;
-		argv[1] = NULL;
-		execve(shell, argv, env);
-
-		/* Executing the shell failed. */
-		perror(shell);
-		exit(1);
-	}
-	/*
-	 * Execute the command using the user's shell.  This uses the -c
-	 * option to execute the command.
-	 */
-	argv[0] = (char *) shell0;
-	argv[1] = "-c";
-	argv[2] = (char *) command;
-	argv[3] = NULL;
-	execve(shell, argv, env);
-	perror(shell);
-	exit(1);
-}
-
-Session *
-session_new(void)
-{
-	int i;
-	static int did_init = 0;
-	if (!did_init) {
-		debug("session_new: init");
-		for (i = 0; i < MAX_SESSIONS; i++) {
-			sessions[i].used = 0;
-		}
-		did_init = 1;
-	}
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (! s->used) {
-			memset(s, 0, sizeof(*s));
-			s->chanid = -1;
-			s->ptyfd = -1;
-			s->ttyfd = -1;
-			s->used = 1;
-			s->self = i;
-			s->env = NULL;
-			debug("session_new: session %d", i);
-			return s;
-		}
-	}
-	return NULL;
-}
-
-static void
-session_dump(void)
-{
-	int i;
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		debug("dump: used %d session %d %p channel %d pid %ld",
-		    s->used,
-		    s->self,
-		    s,
-		    s->chanid,
-		    (long)s->pid);
-	}
-}
-
-int
-session_open(Authctxt *authctxt, int chanid)
-{
-	Session *s = session_new();
-	debug("session_open: channel %d", chanid);
-	if (s == NULL) {
-		error("no more sessions");
-		return 0;
-	}
-	s->authctxt = authctxt;
-	s->pw = authctxt->pw;
-	if (s->pw == NULL)
-		fatal("no user for session %d", s->self);
-	debug("session_open: session %d: link with channel %d", s->self, chanid);
-	s->chanid = chanid;
-	return 1;
-}
-
-#ifndef lint
-Session *
-session_by_tty(char *tty)
-{
-	int i;
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
-			debug("session_by_tty: session %d tty %s", i, tty);
-			return s;
-		}
-	}
-	debug("session_by_tty: unknown tty %.100s", tty);
-	session_dump();
-	return NULL;
-}
-#endif /* lint */
-
-static Session *
-session_by_channel(int id)
-{
-	int i;
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used && s->chanid == id) {
-			debug("session_by_channel: session %d channel %d", i, id);
-			return s;
-		}
-	}
-	debug("session_by_channel: unknown channel %d", id);
-	session_dump();
-	return NULL;
-}
-
-static Session *
-session_by_pid(pid_t pid)
-{
-	int i;
-	debug("session_by_pid: pid %ld", (long)pid);
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used && s->pid == pid)
-			return s;
-	}
-	error("session_by_pid: unknown pid %ld", (long)pid);
-	session_dump();
-	return NULL;
-}
-
-static int
-session_window_change_req(Session *s)
-{
-	s->col = packet_get_int();
-	s->row = packet_get_int();
-	s->xpixel = packet_get_int();
-	s->ypixel = packet_get_int();
-	packet_check_eom();
-	pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
-	return 1;
-}
-
-static int
-session_pty_req(Session *s)
-{
-	u_int len;
-	int n_bytes;
-
-	if (no_pty_flag) {
-		debug("Allocating a pty not permitted for this authentication.");
-		return 0;
-	}
-	if (s->ttyfd != -1) {
-		packet_disconnect("Protocol error: you already have a pty.");
-		return 0;
-	}
-	/* Get the time and hostname when the user last logged in. */
-	if (options.print_lastlog) {
-		s->hostname[0] = '\0';
-		s->last_login_time = get_last_login_time(s->pw->pw_uid,
-		    s->pw->pw_name, s->hostname, sizeof(s->hostname));
-		
-		/*
-		 * PAM may update the last login date.
-		 *
-		 * Ideally PAM would also show the last login date as a
-		 * PAM_TEXT_INFO conversation message, and then we could just
-		 * always force the use of keyboard-interactive just so we can
-		 * pass any such PAM prompts and messages from the account and
-		 * session stacks, but skip pam_authenticate() if other userauth
-		 * has succeeded and the user's password isn't expired.
-		 *
-		 * Unfortunately this depends on support for keyboard-
-		 * interactive in the client, and support for lastlog messages
-		 * in some PAM module.
-		 *
-		 * As it is Solaris updates the lastlog in PAM, but does
-		 * not show the lastlog date in PAM.  If and when this state of
-		 * affairs changes this hack can be reconsidered, and, maybe,
-		 * removed.
-		 *
-		 * So we're stuck with a crude hack: get the lastlog
-		 * time before calling pam_open_session() and store it
-		 * in the Authctxt and then use it here once.  After
-		 * that, if the client opens any more pty sessions we'll
-		 * show the last lastlog entry since userauth.
-		 */
-		if (s->authctxt != NULL && s->authctxt->last_login_time > 0) {
-			s->last_login_time = s->authctxt->last_login_time;
-			(void) strlcpy(s->hostname,
-				       s->authctxt->last_login_host,
-				       sizeof(s->hostname));
-			s->authctxt->last_login_time = 0;
-			s->authctxt->last_login_host[0] = '\0';
-		}
-	}
-
-	s->term = packet_get_string(&len);
-
-	if (compat20) {
-		s->col = packet_get_int();
-		s->row = packet_get_int();
-	} else {
-		s->row = packet_get_int();
-		s->col = packet_get_int();
-	}
-	s->xpixel = packet_get_int();
-	s->ypixel = packet_get_int();
-
-	if (strcmp(s->term, "") == 0) {
-		xfree(s->term);
-		s->term = NULL;
-	}
-
-	/* Allocate a pty and open it. */
-	debug("Allocating pty.");
-	if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
-		if (s->term)
-			xfree(s->term);
-		s->term = NULL;
-		s->ptyfd = -1;
-		s->ttyfd = -1;
-		error("session_pty_req: session %d alloc failed", s->self);
-		return 0;
-	}
-	debug("session_pty_req: session %d alloc %s", s->self, s->tty);
-
-	/* for SSH1 the tty modes length is not given */
-	if (!compat20)
-		n_bytes = packet_remaining();
-	tty_parse_modes(s->ttyfd, &n_bytes);
-
-	/*
-	 * Add a cleanup function to clear the utmp entry and record logout
-	 * time in case we call fatal() (e.g., the connection gets closed).
-	 */
-	fatal_add_cleanup(session_pty_cleanup, (void *)s);
-	pty_setowner(s->pw, s->tty);
-
-	/* Set window size from the packet. */
-	pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
-
-	packet_check_eom();
-	session_proctitle(s);
-	return 1;
-}
-
-static int
-session_subsystem_req(Session *s)
-{
-	struct stat st;
-	u_int len;
-	int success = 0;
-	char *prog, *cmd, *subsys = packet_get_string(&len);
-	u_int i;
-
-	packet_check_eom();
-	log("subsystem request for %.100s", subsys);
-
-	for (i = 0; i < options.num_subsystems; i++) {
-		if (strcmp(subsys, options.subsystem_name[i]) == 0) {
-			prog = options.subsystem_command[i];
-			cmd = options.subsystem_args[i];
-			if (strcmp(INTERNAL_SFTP_NAME, prog) == 0) {
-				s->is_subsystem = SUBSYSTEM_INT_SFTP;
-			/*
-			 * We must stat(2) the subsystem before we chroot in
-			 * order to be able to send a proper error message.
-			 */
-			} else if (chroot_requested(options.chroot_directory)) {
-				char chdirsub[MAXPATHLEN];
-
-				strlcpy(chdirsub, options.chroot_directory,
-				    sizeof (chdirsub));
-				strlcat(chdirsub, "/", sizeof (chdirsub));
-				strlcat(chdirsub, prog, sizeof (chdirsub));
-				if (stat(chdirsub, &st) < 0) {
-					error("subsystem: cannot stat %s under "
-					    "chroot directory %s: %s", prog,
-					    options.chroot_directory,
-					    strerror(errno));
-					if (strcmp(subsys, "sftp") == 0)
-						error("subsystem: please see "
-						    "the Subsystem option in "
-						    "sshd_config(4) for an "
-						    "explanation of '%s'.",
-						    INTERNAL_SFTP_NAME);
-					break;
-				}
-			} else if (stat(prog, &st) < 0) {
-				error("subsystem: cannot stat %s: %s", prog,
-				    strerror(errno));
-				break;
-			} else {
-				s->is_subsystem = SUBSYSTEM_EXT;
-			}
-			debug("subsystem: exec() %s", cmd);
-			do_exec(s, cmd);
-			success = 1;
-			break;
-		}
-	}
-
-	if (!success)
-		log("subsystem request for %.100s failed, subsystem not found",
-		    subsys);
-
-	xfree(subsys);
-	return success;
-}
-
-/*
- * Serve "x11-req" channel request for X11 forwarding for the current session
- * channel.
- */
-static int
-session_x11_req(Session *s)
-{
-	int success, fd;
-	char xauthdir[] = "/tmp/ssh-xauth-XXXXXX";
-
-	s->single_connection = packet_get_char();
-	s->auth_proto = packet_get_string(NULL);
-	s->auth_data = packet_get_string(NULL);
-	s->screen = packet_get_int();
-	packet_check_eom();
-
-	success = session_setup_x11fwd(s);
-	if (!success) {
-		xfree(s->auth_proto);
-		xfree(s->auth_data);
-		s->auth_proto = NULL;
-		s->auth_data = NULL;
-		return (success);
-	}
-
-	/*
-	 * Create per session X authority file so that different sessions
-	 * don't contend for one common file. The reason for this is that
-	 * xauth(1) locking doesn't work too well over network filesystems.
-	 *
-	 * If mkdtemp() or open() fails then s->auth_file remains NULL which
-	 * means that we won't set XAUTHORITY variable in child's environment
-	 * and xauth(1) will use the default location for the authority file.
-	 */
-	if (mkdtemp(xauthdir) != NULL) {
-		s->auth_file = xmalloc(MAXPATHLEN);
-		snprintf(s->auth_file, MAXPATHLEN, "%s/xauthfile",
-		    xauthdir);
-		/*
-		 * we don't want that "creating new authority file" message to
-		 * be printed by xauth(1) so we must create that file
-		 * beforehand.
-		 */
-		if ((fd = open(s->auth_file, O_CREAT | O_EXCL | O_RDONLY,
-		    S_IRUSR | S_IWUSR)) == -1) {
-			error("failed to create the temporary X authority "
-			    "file %s: %.100s; will use the default one",
-			    s->auth_file, strerror(errno));
-			xfree(s->auth_file);
-			s->auth_file = NULL;
-			if (rmdir(xauthdir) == -1) {
-				error("cannot remove xauth directory %s: %.100s",
-				    xauthdir, strerror(errno));
-			}
-		} else {
-			close(fd);
-			debug("temporary X authority file %s created",
-			    s->auth_file);
-
-			/*
-			 * add a cleanup function to remove the temporary
-			 * xauth file in case we call fatal() (e.g., the
-			 * connection gets closed).
-			 */
-			fatal_add_cleanup(session_xauthfile_cleanup, (void *)s);
-		}
-	}
-	else {
-		error("failed to create a directory for the temporary X "
-		    "authority file: %.100s; will use the default xauth file",
-		    strerror(errno));
-	}
-
-	return (success);
-}
-
-static int
-session_shell_req(Session *s)
-{
-	packet_check_eom();
-	do_exec(s, NULL);
-	return 1;
-}
-
-static int
-session_exec_req(Session *s)
-{
-	u_int len;
-	char *command = packet_get_string(&len);
-	packet_check_eom();
-	do_exec(s, command);
-	xfree(command);
-	return 1;
-}
-
-static int
-session_auth_agent_req(Session *s)
-{
-	static int called = 0;
-	packet_check_eom();
-	if (no_agent_forwarding_flag) {
-		debug("session_auth_agent_req: no_agent_forwarding_flag");
-		return 0;
-	}
-	if (called) {
-		return 0;
-	} else {
-		called = 1;
-		return auth_input_request_forwarding(s->pw);
-	}
-}
-
-static int
-session_loc_env_check(char *var, char *val)
-{
-	char *current;
-	int cat, ret;
-
-	if (strcmp(var, "LANG") == 0)
-		cat = LC_ALL;
-	else if (strcmp(var, "LC_ALL") == 0)
-		cat = LC_ALL;
-	else if (strcmp(var, "LC_CTYPE") == 0)
-		cat = LC_CTYPE;
-	else if (strcmp(var, "LC_COLLATE") == 0)
-		cat = LC_COLLATE;
-	else if (strcmp(var, "LC_TIME") == 0)
-		cat = LC_TIME;
-	else if (strcmp(var, "LC_NUMERIC") == 0)
-		cat = LC_NUMERIC;
-	else if (strcmp(var, "LC_MONETARY") == 0)
-		cat = LC_MONETARY;
-	else if (strcmp(var, "LC_MESSAGES") == 0)
-		cat = LC_MESSAGES;
-
-	current = setlocale(cat, NULL);
-
-	ret = (setlocale(cat, val) != NULL);
-	(void) setlocale(cat, current);
-	return (ret);
-}
-
-static int
-session_env_req(Session *s)
-{
-	Channel *c;
-	char *var, *val, *e;
-	char **p;
-	size_t len;
-	int ret = 0;
-
-	/* Get var/val from the rest of this packet */
-	var = packet_get_string(NULL);
-	val = packet_get_string(NULL);
-
-	/*
-	 * We'll need the channel ID for the packet_send_debug messages,
-	 * so get it now.
-	 */
-	if ((c = channel_lookup(s->chanid)) == NULL)
-		goto done;	/* shouldn't happen! */
-
-	debug2("Received request for environment variable %s=%s", var, val);
-
-	/* For now allow only LANG and LC_* */
-	if (strcmp(var, "LANG") != 0 && strncmp(var, "LC_", 3) != 0) {
-		debug2("Rejecting request for environment variable %s", var);
-		goto done;
-	}
-
-	if (!session_loc_env_check(var, val)) {
-		packet_send_debug(gettext("Missing locale support for %s=%s"),
-			var, val);
-		goto done;
-	}
-
-	packet_send_debug(gettext("Channel %d set: %s=%s"), c->remote_id,
-		var, val);
-
-	/*
-	 * Always append new environment variables without regard to old
-	 * ones being overriden.  The way these are actually added to
-	 * the environment of the session process later settings
-	 * override earlier ones; see copy_environment().
-	 */
-	if (s->env == NULL) {
-		char **env;
-
-		env = xmalloc(sizeof (char **) * 2);
-		memset(env, 0, sizeof (char **) * 2);
-
-		s->env = env;
-		p = env;
-	} else {
-		for (p = s->env; *p != NULL ; p++);
-
-		s->env = xrealloc(s->env, (p - s->env + 2) * sizeof (char **));
-
-		for (p = s->env; *p != NULL ; p++);
-	}
-
-	len = snprintf(NULL, 0, "%s=%s", var, val);
-	e = xmalloc(len + 1);
-	(void) snprintf(e, len + 1, "%s=%s", var, val);
-
-	(*p++) = e;
-	*p = NULL;
-
-	ret = 1;
-
-done:
-	xfree(var);
-	xfree(val);
-
-	return (ret);
-}
-
-static void
-session_free_env(char ***envp)
-{
-	char **env, **p;
-
-	if (envp == NULL || *envp == NULL)
-		return;
-
-	env = *envp;
-
-	*envp = NULL;
-
-	for (p = env; *p != NULL; p++)
-		xfree(*p);
-
-	xfree(env);
-}
-
-int
-session_input_channel_req(Channel *c, const char *rtype)
-{
-	int success = 0;
-	Session *s;
-
-	if ((s = session_by_channel(c->self)) == NULL) {
-		log("session_input_channel_req: no session %d req %.100s",
-		    c->self, rtype);
-		return 0;
-	}
-	debug("session_input_channel_req: session %d req %s", s->self, rtype);
-
-	/*
-	 * a session is in LARVAL state until a shell, a command
-	 * or a subsystem is executed
-	 */
-	if (c->type == SSH_CHANNEL_LARVAL) {
-		if (strcmp(rtype, "shell") == 0) {
-			success = session_shell_req(s);
-		} else if (strcmp(rtype, "exec") == 0) {
-			success = session_exec_req(s);
-		} else if (strcmp(rtype, "pty-req") == 0) {
-			success =  session_pty_req(s);
-		} else if (strcmp(rtype, "x11-req") == 0) {
-			success = session_x11_req(s);
-		} else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
-			success = session_auth_agent_req(s);
-		} else if (strcmp(rtype, "subsystem") == 0) {
-			success = session_subsystem_req(s);
-		} else if (strcmp(rtype, "env") == 0) {
-			success = session_env_req(s);
-		}
-	}
-	if (strcmp(rtype, "window-change") == 0) {
-		success = session_window_change_req(s);
-	}
-	return success;
-}
-
-void
-session_set_fds(Session *s, int fdin, int fdout, int fderr)
-{
-	if (!compat20)
-		fatal("session_set_fds: called for proto != 2.0");
-	/*
-	 * now that have a child and a pipe to the child,
-	 * we can activate our channel and register the fd's
-	 */
-	if (s->chanid == -1)
-		fatal("no channel for session %d", s->self);
-	channel_set_fds(s->chanid,
-	    fdout, fdin, fderr,
-	    fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
-	    1,
-	    CHAN_SES_WINDOW_DEFAULT);
-}
-
-/*
- * Function to perform pty cleanup. Also called if we get aborted abnormally
- * (e.g., due to a dropped connection).
- */
-void
-session_pty_cleanup2(void *session)
-{
-	Session *s = session;
-
-	if (s == NULL) {
-		error("session_pty_cleanup: no session");
-		return;
-	}
-	if (s->ttyfd == -1)
-		return;
-
-	debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
-
-#ifdef USE_PAM
-	session_do_pam(s, 0);
-#endif /* USE_PAM */
-
-	/* Record that the user has logged out. */
-	if (s->pid != 0) {
-		debug3("Recording SSHv2 channel logout in utmpx/wtmpx");
-#ifdef ALTPRIVSEP
-		altprivsep_record_logout(s->pid);
-#endif /* ALTPRIVSEP */
-	}
-
-	/* Release the pseudo-tty. */
-	if (getuid() == 0)
-		pty_release(s->tty);
-
-	/*
-	 * Close the server side of the socket pairs.  We must do this after
-	 * the pty cleanup, so that another process doesn't get this pty
-	 * while we're still cleaning up.
-	 */
-	if (close(s->ptymaster) < 0)
-		error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
-
-	/* unlink pty from session */
-	s->ttyfd = -1;
-}
-
-void
-session_pty_cleanup(void *session)
-{
-	session_pty_cleanup2(session);
-}
-
-/*
- * We use a different temporary X authority file per every session so we
- * should remove those files when fatal() is called.
- */
-void
-session_xauthfile_cleanup(void *session)
-{
-	Session *s = session;
-
-	if (s == NULL) {
-		error("session_xauthfile_cleanup: no session");
-		return;
-	}
-
-	debug("session_xauthfile_cleanup: session %d removing %s", s->self,
-	    s->auth_file);
-
-	if (unlink(s->auth_file) == -1) {
-		error("session_xauthfile_cleanup: cannot remove xauth file: "
-		    "%.100s", strerror(errno));
-		return;
-	}
-
-	/* dirname() will modify s->auth_file but that's ok */
-	if (rmdir(dirname(s->auth_file)) == -1) {
-		error("session_xauthfile_cleanup: "
-		    "cannot remove xauth directory: %.100s", strerror(errno));
-		return;
-	}
-}
-
-static char *
-sig2name(int sig)
-{
-#define SSH_SIG(x) if (sig == SIG ## x) return #x
-	SSH_SIG(ABRT);
-	SSH_SIG(ALRM);
-	SSH_SIG(FPE);
-	SSH_SIG(HUP);
-	SSH_SIG(ILL);
-	SSH_SIG(INT);
-	SSH_SIG(KILL);
-	SSH_SIG(PIPE);
-	SSH_SIG(QUIT);
-	SSH_SIG(SEGV);
-	SSH_SIG(TERM);
-	SSH_SIG(USR1);
-	SSH_SIG(USR2);
-#undef	SSH_SIG
-	return "SIG@openssh.com";
-}
-
-static void
-session_exit_message(Session *s, int status)
-{
-	Channel *c;
-
-	if ((c = channel_lookup(s->chanid)) == NULL)
-		fatal("session_exit_message: session %d: no channel %d",
-		    s->self, s->chanid);
-	debug("session_exit_message: session %d channel %d pid %ld",
-	    s->self, s->chanid, (long)s->pid);
-
-	if (WIFEXITED(status)) {
-		channel_request_start(s->chanid, "exit-status", 0);
-		packet_put_int(WEXITSTATUS(status));
-		packet_send();
-	} else if (WIFSIGNALED(status)) {
-		channel_request_start(s->chanid, "exit-signal", 0);
-		packet_put_cstring(sig2name(WTERMSIG(status)));
-#ifdef WCOREDUMP
-		packet_put_char(WCOREDUMP(status));
-#else /* WCOREDUMP */
-		packet_put_char(0);
-#endif /* WCOREDUMP */
-		packet_put_cstring("");
-		packet_put_cstring("");
-		packet_send();
-	} else {
-		/* Some weird exit cause.  Just exit. */
-		packet_disconnect("wait returned status %04x.", status);
-	}
-
-	/* Ok to close channel now */
-	channel_set_wait_for_exit(s->chanid, 0);
-
-	/* disconnect channel */
-	debug("session_exit_message: release channel %d", s->chanid);
-	channel_cancel_cleanup(s->chanid);
-	/*
-	 * emulate a write failure with 'chan_write_failed', nobody will be
-	 * interested in data we write.
-	 * Note that we must not call 'chan_read_failed', since there could
-	 * be some more data waiting in the pipe.
-	 */
-	if (c->ostate != CHAN_OUTPUT_CLOSED)
-		chan_write_failed(c);
-	s->chanid = -1;
-}
-
-void
-session_close(Session *s)
-{
-	debug("session_close: session %d pid %ld", s->self, (long)s->pid);
-	if (s->ttyfd != -1) {
-		fatal_remove_cleanup(session_pty_cleanup, (void *)s);
-		session_pty_cleanup(s);
-	}
-	if (s->auth_file != NULL) {
-		fatal_remove_cleanup(session_xauthfile_cleanup, (void *)s);
-		session_xauthfile_cleanup(s);
-		xfree(s->auth_file);
-	}
-	if (s->term)
-		xfree(s->term);
-	if (s->display)
-		xfree(s->display);
-	if (s->auth_display)
-		xfree(s->auth_display);
-	if (s->auth_data)
-		xfree(s->auth_data);
-	if (s->auth_proto)
-		xfree(s->auth_proto);
-	if (s->command)
-		xfree(s->command);
-	session_free_env(&s->env);
-	s->used = 0;
-	session_proctitle(s);
-}
-
-void
-session_close_by_pid(pid_t pid, int status)
-{
-	Session *s = session_by_pid(pid);
-	if (s == NULL) {
-		debug("session_close_by_pid: no session for pid %ld",
-		    (long)pid);
-		return;
-	}
-	if (s->chanid != -1)
-		session_exit_message(s, status);
-	session_close(s);
-}
-
-/*
- * This is called when a channel dies before the session 'child' itself dies.
- * It can happen for example if we exit from an interactive shell before we
- * exit from forwarded X11 applications.
- */
-void
-session_close_by_channel(int id, void *arg)
-{
-	Session *s = session_by_channel(id);
-	if (s == NULL) {
-		debug("session_close_by_channel: no session for id %d", id);
-		return;
-	}
-	debug("session_close_by_channel: channel %d child %ld",
-	    id, (long)s->pid);
-	if (s->pid != 0) {
-		debug("session_close_by_channel: channel %d: has child", id);
-		/*
-		 * delay detach of session, but release pty, since
-		 * the fd's to the child are already closed
-		 */
-		if (s->ttyfd != -1) {
-			fatal_remove_cleanup(session_pty_cleanup, (void *)s);
-			session_pty_cleanup(s);
-		}
-		return;
-	}
-	/* detach by removing callback */
-	channel_cancel_cleanup(s->chanid);
-	s->chanid = -1;
-	session_close(s);
-}
-
-void
-session_destroy_all(void (*closefunc)(Session *))
-{
-	int i;
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used) {
-			if (closefunc != NULL)
-				closefunc(s);
-			else
-				session_close(s);
-		}
-	}
-}
-
-static char *
-session_tty_list(void)
-{
-	static char buf[1024];
-	int i;
-	buf[0] = '\0';
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used && s->ttyfd != -1) {
-			if (buf[0] != '\0')
-				strlcat(buf, ",", sizeof buf);
-			strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
-		}
-	}
-	if (buf[0] == '\0')
-		strlcpy(buf, "notty", sizeof buf);
-	return buf;
-}
-
-void
-session_proctitle(Session *s)
-{
-	if (s->pw == NULL)
-		error("no user for session %d", s->self);
-	else
-		setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
-}
-
-int
-session_setup_x11fwd(Session *s)
-{
-	struct stat st;
-	char display[512], auth_display[512];
-	char hostname[MAXHOSTNAMELEN];
-
-	if (no_x11_forwarding_flag) {
-		packet_send_debug("X11 forwarding disabled in user configuration file.");
-		return 0;
-	}
-	if (!options.x11_forwarding) {
-		debug("X11 forwarding disabled in server configuration file.");
-		return 0;
-	}
-	if (!options.xauth_location ||
-	    (stat(options.xauth_location, &st) == -1)) {
-		packet_send_debug("No xauth program; cannot forward with spoofing.");
-		return 0;
-	}
-	if (s->display != NULL) {
-		debug("X11 display already set.");
-		return 0;
-	}
-	if (x11_create_display_inet(options.x11_display_offset,
-	    options.x11_use_localhost, s->single_connection,
-	    &s->display_number) == -1) {
-		debug("x11_create_display_inet failed.");
-		return 0;
-	}
-
-	/* Set up a suitable value for the DISPLAY variable. */
-	if (gethostname(hostname, sizeof(hostname)) < 0)
-		fatal("gethostname: %.100s", strerror(errno));
-	/*
-	 * auth_display must be used as the displayname when the
-	 * authorization entry is added with xauth(1).  This will be
-	 * different than the DISPLAY string for localhost displays.
-	 */
-	if (options.x11_use_localhost) {
-		snprintf(display, sizeof display, "localhost:%u.%u",
-		    s->display_number, s->screen);
-		snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
-		    s->display_number, s->screen);
-		s->display = xstrdup(display);
-		s->auth_display = xstrdup(auth_display);
-	} else {
-#ifdef IPADDR_IN_DISPLAY
-		struct hostent *he;
-		struct in_addr my_addr;
-
-		he = gethostbyname(hostname);
-		if (he == NULL) {
-			error("Can't get IP address for X11 DISPLAY.");
-			packet_send_debug("Can't get IP address for X11 DISPLAY.");
-			return 0;
-		}
-		memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
-		snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
-		    s->display_number, s->screen);
-#else
-		snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
-		    s->display_number, s->screen);
-#endif
-		s->display = xstrdup(display);
-		s->auth_display = xstrdup(display);
-	}
-
-	return 1;
-}
-
-#ifdef USE_PAM
-int session_do_pam_conv(int, struct pam_message **,
-			struct pam_response **, void *);
-
-static struct pam_conv session_pam_conv = {
-	session_do_pam_conv,
-	NULL
-};
-
-static void
-session_do_pam(Session *s, int do_open)
-{
-	int pam_retval;
-	char *where, *old_tty, *old_tty_copy = NULL;
-	struct pam_conv old_conv, *old_conv_ptr;
-
-	if (!s || !s->authctxt || !s->authctxt->pam || !s->authctxt->pam->h)
-		return;
-
-	/* Save current PAM item values */
-	where = "getting PAM_CONV";
-	pam_retval = pam_get_item(s->authctxt->pam->h, PAM_CONV,
-				  (void **) &old_conv_ptr);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-	old_conv = *old_conv_ptr;
-
-	where = "getting PAM_TTY";
-	pam_retval = pam_get_item(s->authctxt->pam->h, PAM_TTY,
-				  (void **) &old_tty);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-	old_tty_copy = xstrdup(old_tty);
-
-	/* Change PAM_TTY and PAM_CONV items */
-	where = "setting PAM_TTY";
-	pam_retval = pam_set_item(s->authctxt->pam->h, PAM_TTY, s->tty);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-
-	where = "setting PAM_CONV";
-	session_pam_conv.appdata_ptr = s;
-	pam_retval = pam_set_item(s->authctxt->pam->h,
-				  PAM_CONV, &session_pam_conv);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-
-	/* Call pam_open/close_session() */
-	if (do_open) {
-		where = "calling pam_open_session()";
-		pam_retval = pam_open_session(s->authctxt->pam->h, 0);
-	}
-	else {
-		where = "calling pam_close_session()";
-		pam_retval = pam_close_session(s->authctxt->pam->h, 0);
-	}
-
-	/* Reset PAM_TTY and PAM_CONV items to previous values */
-	where = "setting PAM_TTY";
-	pam_retval = pam_set_item(s->authctxt->pam->h, PAM_TTY, old_tty_copy);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-
-	where = "setting PAM_CONV";
-	pam_retval = pam_set_item(s->authctxt->pam->h, PAM_CONV, &old_conv);
-	if (pam_retval != PAM_SUCCESS)
-		goto done;
-
-	session_pam_conv.appdata_ptr = NULL;
-
-done:
-	if (old_tty_copy)
-		xfree(old_tty_copy);
-
-	if (pam_retval == PAM_SUCCESS)
-		return;
-
-	/* fatal()? probably not... */
-	log("PAM failed[%d] while %s: %s", pam_retval, where,
-	    PAM_STRERROR(s->authctxt->pam->h, pam_retval));
-}
-
-int
-session_do_pam_conv(int num_prompts,
-		    struct pam_message **prompts,
-		    struct pam_response **resp,
-		    void *app_data)
-{
-	Session *s = (Session *) app_data;
-
-	struct pam_response *reply;
-	int count;
-	char *prompt;
-
-	if (channel_lookup(s->chanid) == NULL)
-		return PAM_CONV_ERR;
-
-	/* PAM will free this later */
-	reply = xmalloc(num_prompts * sizeof(*reply));
-
-	(void) memset(reply, 0, num_prompts * sizeof(*reply));
-	for (count = 0; count < num_prompts; count++) {
-		switch(PAM_MSG_MEMBER(prompts, count, msg_style)) {
-		case PAM_TEXT_INFO:
-			/* Write to stdout of channel */
-			prompt = PAM_MSG_MEMBER(prompts, count, msg);
-			if (prompt != NULL && s->ttyfd != -1) {
-				debug2("session_do_pam_conv: text info "
-				       "prompt: %s", prompt);
-				(void) write(s->ttyfd, prompt, strlen(prompt));
-				(void) write(s->ttyfd, "\n", 1);
-			}
-			reply[count].resp = xstrdup("");
-			reply[count].resp_retcode = PAM_SUCCESS;
-			break;
-		case PAM_ERROR_MSG:
-			/* Write to stderr of channel */
-			prompt = PAM_MSG_MEMBER(prompts, count, msg);
-			if (prompt != NULL && s->ttyfd != -1) {
-				debug2("session_do_pam_conv: error "
-				       "prompt: %s", prompt);
-				(void) write(s->ttyfd, prompt, strlen(prompt));
-				(void) write(s->ttyfd, "\n", 1);
-			}
-			reply[count].resp = xstrdup("");
-			reply[count].resp_retcode = PAM_SUCCESS;
-			break;
-		case PAM_PROMPT_ECHO_ON:
-		case PAM_PROMPT_ECHO_OFF:
-		    /*
-		     * XXX Someday add support for echo on/off prompts
-		     *     here on sessions with ttys.
-		     */
-		default:
-			xfree(reply);
-			return PAM_CONV_ERR;
-		}
-	}
-
-	*resp = reply;
-
-	return PAM_SUCCESS;
-}
-#endif /* USE_PAM */
-
-static void
-do_authenticated2(Authctxt *authctxt)
-{
-	server_loop2(authctxt);
-}
-
-/*
- * Drop the privileges. We need this for the in-process SFTP server only. For
- * the shell and the external subsystem the exec(2) call will do the P = E = I
- * assignment itself. Never change the privileges if the connecting user is
- * root. See privileges(5) if the terminology used here is not known to you.
- */
-static void
-drop_privs(uid_t uid)
-{
-	priv_set_t *priv_inherit;
-
-	/* If root is connecting we are done. */
-	if (uid == 0)
-		return;
-
-	if ((priv_inherit = priv_allocset()) == NULL)
-		fatal("priv_allocset: %s", strerror(errno));
-	if (getppriv(PRIV_INHERITABLE, priv_inherit) != 0)
-		fatal("getppriv: %s", strerror(errno));
-
-	/*
-	 * This will limit E as well. Note that before this P was a
-	 * superset of I, see permanently_set_uid().
-	 */
-	if (setppriv(PRIV_SET, PRIV_PERMITTED, priv_inherit) == -1)
-		fatal("setppriv: %s", strerror(errno));
-
-	priv_freeset(priv_inherit);
-
-	/*
-	 * By manipulating the P set above we entered a PA mode which we
-	 * do not need to retain in.
-	 */
-	if (setpflags(PRIV_AWARE, 0) == -1)
-		fatal("setpflags: %s", strerror(errno));
-}
