Properly flatten openssh/dist.

1 files changed, 0 insertions, 2510 deletions

diff --git a/crypto/openssh/session.c b/crypto/openssh/session.c
deleted file mode 100644
index 69153ad..0000000
--- a/crypto/openssh/session.c
+++ /dev/null
@@ -1,2510 +0,0 @@
-/* $OpenBSD: session.c,v 1.220 2006/10/09 23:36:11 djm Exp $ */
-/*
- * 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.
- */
-
-#include "includes.h"
-
-#include <sys/types.h>
-#include <sys/param.h>
-#ifdef HAVE_SYS_STAT_H
-# include <sys/stat.h>
-#endif
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <sys/wait.h>
-
-#include <arpa/inet.h>
-
-#include <errno.h>
-#include <grp.h>
-#ifdef HAVE_PATHS_H
-#include <paths.h>
-#endif
-#include <pwd.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "xmalloc.h"
-#include "ssh.h"
-#include "ssh1.h"
-#include "ssh2.h"
-#include "sshpty.h"
-#include "packet.h"
-#include "buffer.h"
-#include "match.h"
-#include "uidswap.h"
-#include "compat.h"
-#include "channels.h"
-#include "key.h"
-#include "cipher.h"
-#ifdef GSSAPI
-#include "ssh-gss.h"
-#endif
-#include "hostfile.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 "kex.h"
-#include "monitor_wrap.h"
-
-#if defined(KRB5) && defined(USE_AFS)
-#include <kafs.h>
-#endif
-
-/* func */
-
-Session *session_new(void);
-void	session_set_fds(Session *, int, int, int);
-void	session_pty_cleanup(Session *);
-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 *);
-#ifdef LOGIN_NEEDS_UTMPX
-static void	do_pre_login(Session *s);
-#endif
-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 *);
-
-/* import */
-extern ServerOptions options;
-extern char *__progname;
-extern int log_stderr;
-extern int debug_flag;
-extern u_int utmp_len;
-extern int startup_pipe;
-extern void destroy_sensitive_data(void);
-extern Buffer loginmsg;
-
-/* original command from peer. */
-const char *original_command = NULL;
-
-/* data */
-#define MAX_SESSIONS 10
-Session	sessions[MAX_SESSIONS];
-
-#ifdef HAVE_LOGIN_CAP
-login_cap_t *lc;
-#endif
-
-static int is_child = 0;
-
-/* 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(struct passwd *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-XXXXXXXXXX", 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());
-
-	/* 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, SSH_LISTEN_BACKLOG) < 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, "auth socket", 1);
-	strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
-	return 1;
-}
-
-static void
-display_loginmsg(void)
-{
-	if (buffer_len(&loginmsg) > 0) {
-		buffer_append(&loginmsg, "\0", 1);
-		printf("%s", (char *)buffer_ptr(&loginmsg));
-		buffer_clear(&loginmsg);
-	}
-}
-
-void
-do_authenticated(Authctxt *authctxt)
-{
-	setproctitle("%s", authctxt->pw->pw_name);
-
-	/* 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);
-
-	do_cleanup(authctxt);
-}
-
-/*
- * 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();
-	if (s == NULL) {
-		error("no more sessions");
-		return;
-	}
-	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 invalid compression level %d.",
-				    compression_level);
-				break;
-			}
-			if (options.compression == COMP_NONE) {
-				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.");
-			if (channel_input_port_forward_request(s->pw->pw_uid == 0,
-			    options.gateway_ports) < 0) {
-				debug("Port forwarding failed.");
-				break;
-			}
-			success = 1;
-			break;
-
-		case SSH_CMSG_MAX_PACKET_SIZE:
-			if (packet_set_maxsize(packet_get_int()) > 0)
-				success = 1;
-			break;
-
-		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.
-			 */
-			logit("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;
-
-#ifdef USE_PIPES
-	int pin[2], pout[2], perr[2];
-	/* Allocate pipes for communicating with the program. */
-	if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
-		packet_disconnect("Could not create pipes: %.100s",
-				  strerror(errno));
-#else /* USE_PIPES */
-	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));
-#endif /* USE_PIPES */
-	if (s == NULL)
-		fatal("do_exec_no_pty: no session");
-
-	session_proctitle(s);
-
-#if defined(USE_PAM)
-	if (options.use_pam && !use_privsep)
-		do_pam_setcred(1);
-#endif /* USE_PAM */
-
-	/* Fork the child. */
-	if ((pid = fork()) == 0) {
-		is_child = 1;
-
-		/* 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));
-
-#ifdef USE_PIPES
-		/*
-		 * Redirect stdin.  We close the parent side of the socket
-		 * pair, and make the child side the standard input.
-		 */
-		close(pin[1]);
-		if (dup2(pin[0], 0) < 0)
-			perror("dup2 stdin");
-		close(pin[0]);
-
-		/* Redirect stdout. */
-		close(pout[0]);
-		if (dup2(pout[1], 1) < 0)
-			perror("dup2 stdout");
-		close(pout[1]);
-
-		/* Redirect stderr. */
-		close(perr[0]);
-		if (dup2(perr[1], 2) < 0)
-			perror("dup2 stderr");
-		close(perr[1]);
-#else /* USE_PIPES */
-		/*
-		 * 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 (dup2(err[0], 2) < 0)	/* stderr */
-			perror("dup2 stderr");
-#endif /* USE_PIPES */
-
-#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);
-#ifdef USE_PIPES
-	/* We are the parent.  Close the child sides of the pipes. */
-	close(pin[0]);
-	close(pout[1]);
-	close(perr[1]);
-
-	if (compat20) {
-		if (s->is_subsystem) {
-			close(perr[0]);
-			perr[0] = -1;
-		}
-		session_set_fds(s, pin[1], pout[0], perr[0]);
-	} else {
-		/* Enter the interactive session. */
-		server_loop(pid, pin[1], pout[0], perr[0]);
-		/* server_loop has closed pin[1], pout[0], and perr[0]. */
-	}
-#else /* USE_PIPES */
-	/* We are the parent.  Close the child sides of the socket pairs. */
-	close(inout[0]);
-	close(err[0]);
-
-	/*
-	 * Clear loginmsg, since it's the child's responsibility to display
-	 * it to the user, otherwise multiple sessions may accumulate
-	 * multiple copies of the login messages.
-	 */
-	buffer_clear(&loginmsg);
-
-	/*
-	 * 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]);
-	} else {
-		server_loop(pid, inout[1], inout[1], err[1]);
-		/* server_loop has closed inout[1] and err[1]. */
-	}
-#endif /* USE_PIPES */
-}
-
-/*
- * 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;
-	pid_t pid;
-
-	if (s == NULL)
-		fatal("do_exec_pty: no session");
-	ptyfd = s->ptyfd;
-	ttyfd = s->ttyfd;
-
-#if defined(USE_PAM)
-	if (options.use_pam) {
-		do_pam_set_tty(s->tty);
-		if (!use_privsep)
-			do_pam_setcred(1);
-	}
-#endif
-
-	/* Fork the child. */
-	if ((pid = fork()) == 0) {
-		is_child = 1;
-
-		/* 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) */
-#ifndef HAVE_OSF_SIA
-		if (!(options.use_login && command == NULL)) {
-#ifdef _UNICOS
-			cray_init_job(s->pw); /* set up cray jid and tmpdir */
-#endif /* _UNICOS */
-			do_login(s, command);
-		}
-# ifdef LOGIN_NEEDS_UTMPX
-		else
-			do_pre_login(s);
-# endif
-#endif
-
-		/* Do common processing for the child, such as execing the command. */
-		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;
-
-	/* 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);
-	} else {
-		server_loop(pid, ptyfd, fdout, -1);
-		/* server_loop _has_ closed ptyfd and fdout. */
-	}
-}
-
-#ifdef LOGIN_NEEDS_UTMPX
-static void
-do_pre_login(Session *s)
-{
-	socklen_t fromlen;
-	struct sockaddr_storage from;
-	pid_t pid = getpid();
-
-	/*
-	 * Get IP address of client. If the connection is not a socket, let
-	 * the address be 0.0.0.0.
-	 */
-	memset(&from, 0, sizeof(from));
-	fromlen = sizeof(from);
-	if (packet_connection_is_on_socket()) {
-		if (getpeername(packet_get_connection_in(),
-		    (struct sockaddr *)&from, &fromlen) < 0) {
-			debug("getpeername: %.100s", strerror(errno));
-			cleanup_exit(255);
-		}
-	}
-
-	record_utmp_only(pid, s->tty, s->pw->pw_name,
-	    get_remote_name_or_ip(utmp_len, options.use_dns),
-	    (struct sockaddr *)&from, fromlen);
-}
-#endif
-
-/*
- * 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 (options.adm_forced_command) {
-		original_command = command;
-		command = options.adm_forced_command;
-		debug("Forced command (config) '%.900s'", command);
-	} else if (forced_command) {
-		original_command = command;
-		command = forced_command;
-		debug("Forced command (key option) '%.900s'", command);
-	}
-
-#ifdef SSH_AUDIT_EVENTS
-	if (command != NULL)
-		PRIVSEP(audit_run_command(command));
-	else if (s->ttyfd == -1) {
-		char *shell = s->pw->pw_shell;
-
-		if (shell[0] == '\0')	/* empty shell means /bin/sh */
-			shell =_PATH_BSHELL;
-		PRIVSEP(audit_run_command(shell));
-	}
-#endif
-
-	if (s->ttyfd != -1)
-		do_exec_pty(s, command);
-	else
-		do_exec_no_pty(s, command);
-
-	original_command = NULL;
-
-	/*
-	 * Clear loginmsg: it's the child's responsibility to display
-	 * it to the user, otherwise multiple sessions may accumulate
-	 * multiple copies of the login messages.
-	 */
-	buffer_clear(&loginmsg);
-}
-
-/* administrative, login(1)-like work */
-void
-do_login(Session *s, const char *command)
-{
-	socklen_t fromlen;
-	struct sockaddr_storage from;
-	struct passwd * pw = s->pw;
-	pid_t pid = getpid();
-
-	/*
-	 * Get IP address of client. If the connection is not a socket, let
-	 * the address be 0.0.0.0.
-	 */
-	memset(&from, 0, sizeof(from));
-	fromlen = sizeof(from);
-	if (packet_connection_is_on_socket()) {
-		if (getpeername(packet_get_connection_in(),
-		    (struct sockaddr *) & from, &fromlen) < 0) {
-			debug("getpeername: %.100s", strerror(errno));
-			cleanup_exit(255);
-		}
-	}
-
-	/* Record that there was a login on that tty from the remote host. */
-	if (!use_privsep)
-		record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
-		    get_remote_name_or_ip(utmp_len,
-		    options.use_dns),
-		    (struct sockaddr *)&from, fromlen);
-
-#ifdef USE_PAM
-	/*
-	 * If password change is needed, do it now.
-	 * This needs to occur before the ~/.hushlogin check.
-	 */
-	if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
-		display_loginmsg();
-		do_pam_chauthtok();
-		s->authctxt->force_pwchange = 0;
-		/* XXX - signal [net] parent to enable forwardings */
-	}
-#endif
-
-	if (check_quietlogin(s, command))
-		return;
-
-	display_loginmsg();
-
-	do_motd();
-}
-
-/*
- * 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)
-{
-	char **env;
-	u_int envsize;
-	u_int i, namelen;
-
-	/*
-	 * If we're passed an uninitialized list, allocate a single null
-	 * entry before continuing.
-	 */
-	if (*envp == NULL && *envsizep == 0) {
-		*envp = xmalloc(sizeof(char *));
-		*envp[0] = NULL;
-		*envsizep = 1;
-	}
-
-	/*
-	 * 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. */
-		envsize = *envsizep;
-		if (i >= envsize - 1) {
-			if (envsize >= 1000)
-				fatal("child_set_env: too many env vars");
-			envsize += 50;
-			env = (*envp) = xrealloc(env, envsize, sizeof(char *));
-			*envsizep = envsize;
-		}
-		/* 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, "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);
-}
-
-#ifdef HAVE_ETC_DEFAULT_LOGIN
-/*
- * Return named variable from specified environment, or NULL if not present.
- */
-static char *
-child_get_env(char **env, const char *name)
-{
-	int i;
-	size_t len;
-
-	len = strlen(name);
-	for (i=0; env[i] != NULL; i++)
-		if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
-			return(env[i] + len + 1);
-	return NULL;
-}
-
-/*
- * Read /etc/default/login.
- * We pick up the PATH (or SUPATH for root) and UMASK.
- */
-static void
-read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
-{
-	char **tmpenv = NULL, *var;
-	u_int i, tmpenvsize = 0;
-	u_long mask;
-
-	/*
-	 * We don't want to copy the whole file to the child's environment,
-	 * so we use a temporary environment and copy the variables we're
-	 * interested in.
-	 */
-	read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
-
-	if (tmpenv == NULL)
-		return;
-
-	if (uid == 0)
-		var = child_get_env(tmpenv, "SUPATH");
-	else
-		var = child_get_env(tmpenv, "PATH");
-	if (var != NULL)
-		child_set_env(env, envsize, "PATH", var);
-
-	if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
-		if (sscanf(var, "%5lo", &mask) == 1)
-			umask((mode_t)mask);
-
-	for (i = 0; tmpenv[i] != NULL; i++)
-		xfree(tmpenv[i]);
-	xfree(tmpenv);
-}
-#endif /* HAVE_ETC_DEFAULT_LOGIN */
-
-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);
-	}
-}
-
-static char **
-do_setup_env(Session *s, const char *shell)
-{
-	char buf[256];
-	u_int i, envsize;
-	char **env, *laddr;
-	struct passwd *pw = s->pw;
-#ifndef HAVE_LOGIN_CAP
-	char *path = NULL;
-#endif
-
-	/* Initialize the environment. */
-	envsize = 100;
-	env = xcalloc(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.
-	 */
-	{
-		char **p;
-
-		p = fetch_windows_environment();
-		copy_environment(p, &env, &envsize);
-		free_windows_environment(p);
-	}
-#endif
-
-#ifdef GSSAPI
-	/* Allow any GSSAPI methods that we've used to alter
-	 * the childs environment as they see fit
-	 */
-	ssh_gssapi_do_child(&env, &envsize);
-#endif
-
-	if (!options.use_login) {
-		/* Set basic environment. */
-		for (i = 0; i < s->num_env; i++)
-			child_set_env(&env, &envsize, s->env[i].name,
-			    s->env[i].val);
-
-		child_set_env(&env, &envsize, "USER", pw->pw_name);
-		child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
-#ifdef _AIX
-		child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
-#endif
-		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 HAVE_ETC_DEFAULT_LOGIN
-		read_etc_default_login(&env, &envsize, pw->pw_uid);
-		path = child_get_env(env, "PATH");
-#  endif /* HAVE_ETC_DEFAULT_LOGIN */
-		if (path == NULL || *path == '\0') {
-			child_set_env(&env, &envsize, "PATH",
-			    s->pw->pw_uid == 0 ?
-				SUPERUSER_PATH : _PATH_STDPATH);
-		}
-# endif /* HAVE_CYGWIN */
-#endif /* HAVE_LOGIN_CAP */
-
-		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);
-	}
-	if (getenv("TZ"))
-		child_set_env(&env, &envsize, "TZ", getenv("TZ"));
-
-	/* Set custom environment options from RSA authentication. */
-	if (!options.use_login) {
-		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);
-
-	laddr = get_local_ipaddr(packet_get_connection_in());
-	snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
-	    get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
-	xfree(laddr);
-	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 */
-
-	/*
-	 * Since we clear KRB5CCNAME at startup, if it's set now then it
-	 * must have been set by a native authentication method (eg AIX or
-	 * SIA), so copy it to the child.
-	 */
-	{
-		char *cp;
-
-		if ((cp = getenv("KRB5CCNAME")) != NULL)
-			child_set_env(&env, &envsize, "KRB5CCNAME", cp);
-	}
-
-#ifdef _AIX
-	{
-		char *cp;
-
-		if ((cp = getenv("AUTHSTATE")) != NULL)
-			child_set_env(&env, &envsize, "AUTHSTATE", cp);
-		read_environment_file(&env, &envsize, "/etc/environment");
-	}
-#endif
-#ifdef KRB5
-	if (s->authctxt->krb5_ccname)
-		child_set_env(&env, &envsize, "KRB5CCNAME",
-		    s->authctxt->krb5_ccname);
-#endif
-#ifdef USE_PAM
-	/*
-	 * Pull in any environment variables that may have
-	 * been set by PAM.
-	 */
-	if (options.use_pam) {
-		char **p;
-
-		p = fetch_pam_child_environment();
-		copy_environment(p, &env, &envsize);
-		free_pam_environment(p);
-
-		p = fetch_pam_environment();
-		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 && !options.use_login) {
-		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, "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 remove %.100s\n",
-			    options.xauth_location, s->auth_display);
-			fprintf(stderr,
-			    "%.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, "remove %s\n",
-			    s->auth_display);
-			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);
-		}
-	}
-}
-
-static void
-do_nologin(struct passwd *pw)
-{
-	FILE *f = NULL;
-	char buf[1024];
-
-#ifdef HAVE_LOGIN_CAP
-	if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
-		f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
-		    _PATH_NOLOGIN), "r");
-#else
-	if (pw->pw_uid)
-		f = fopen(_PATH_NOLOGIN, "r");
-#endif
-	if (f) {
-		/* /etc/nologin exists.  Print its contents and exit. */
-		logit("User %.100s not allowed because %s exists",
-		    pw->pw_name, _PATH_NOLOGIN);
-		while (fgets(buf, sizeof(buf), f))
-			fputs(buf, stderr);
-		fclose(f);
-		fflush(NULL);
-		exit(254);
-	}
-}
-
-/* Set login name, uid, gid, and groups. */
-void
-do_setusercontext(struct passwd *pw)
-{
-#ifndef HAVE_CYGWIN
-	if (getuid() == 0 || geteuid() == 0)
-#endif /* HAVE_CYGWIN */
-	{
-
-#ifdef HAVE_SETPCRED
-		if (setpcred(pw->pw_name, (char **)NULL) == -1)
-			fatal("Failed to set process credentials");
-#endif /* HAVE_SETPCRED */
-#ifdef HAVE_LOGIN_CAP
-# ifdef __bsdi__
-		setpgid(0, 0);
-# endif
-#ifdef GSSAPI
-		if (options.gss_authentication) {
-			temporarily_use_uid(pw);
-			ssh_gssapi_storecreds();
-			restore_uid();
-		}
-#endif
-# ifdef USE_PAM
-		if (options.use_pam) {
-			do_pam_session();
-			do_pam_setcred(0);
-		}
-# endif /* USE_PAM */
-		if (setusercontext(lc, pw, pw->pw_uid,
-		    (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
-			perror("unable to set user context");
-			exit(1);
-		}
-#else
-# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
-		/* Sets login uid for accounting */
-		if (getluid() == -1 && setluid(pw->pw_uid) == -1)
-			error("setluid: %s", strerror(errno));
-# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
-
-		if (setlogin(pw->pw_name) < 0)
-			error("setlogin failed: %s", strerror(errno));
-		if (setgid(pw->pw_gid) < 0) {
-			perror("setgid");
-			exit(1);
-		}
-		/* Initialize the group list. */
-		if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
-			perror("initgroups");
-			exit(1);
-		}
-		endgrent();
-#ifdef GSSAPI
-		if (options.gss_authentication) {
-			temporarily_use_uid(pw);
-			ssh_gssapi_storecreds();
-			restore_uid();
-		}
-#endif
-# ifdef USE_PAM
-		/*
-		 * PAM credentials may take the form of supplementary groups.
-		 * These will have been wiped by the above initgroups() call.
-		 * Reestablish them here.
-		 */
-		if (options.use_pam) {
-			do_pam_session();
-			do_pam_setcred(0);
-		}
-# endif /* USE_PAM */
-# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
-		irix_setusercontext(pw);
-#  endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
-# ifdef _AIX
-		aix_usrinfo(pw);
-# endif /* _AIX */
-#if defined(HAVE_LIBIAF)  &&  !defined(BROKEN_LIBIAF)
-		if (set_id(pw->pw_name) != 0) {
-			exit(1);
-		}
-#endif /* HAVE_LIBIAF  && !BROKEN_LIBIAF */
-		/* Permanently switch to the desired uid. */
-		permanently_set_uid(pw);
-#endif
-	}
-
-#ifdef HAVE_CYGWIN
-	if (is_winnt)
-#endif
-	if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
-		fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
-
-#ifdef WITH_SELINUX
-	ssh_selinux_setup_exec_context(pw->pw_name);
-#endif
-}
-
-static void
-do_pwchange(Session *s)
-{
-	fflush(NULL);
-	fprintf(stderr, "WARNING: Your password has expired.\n");
-	if (s->ttyfd != -1) {
-		fprintf(stderr,
-		    "You must change your password now and login again!\n");
-#ifdef PASSWD_NEEDS_USERNAME
-		execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name,
-		    (char *)NULL);
-#else
-		execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
-#endif
-		perror("passwd");
-	} else {
-		fprintf(stderr,
-		    "Password change required but no TTY available.\n");
-	}
-	exit(1);
-}
-
-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);
-}
-
-static void
-child_close_fds(void)
-{
-	int i;
-
-	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();
-
-	/*
-	 * 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.
-	 */
-	for (i = 3; i < 64; i++)
-		close(i);
-}
-
-/*
- * 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.
- */
-void
-do_child(Session *s, const char *command)
-{
-	extern char **environ;
-	char **env;
-	char *argv[10];
-	const char *shell, *shell0, *hostname = NULL;
-	struct passwd *pw = s->pw;
-
-	/* remove hostkey from the child's memory */
-	destroy_sensitive_data();
-
-	/* Force a password change */
-	if (s->authctxt->force_pwchange) {
-		do_setusercontext(pw);
-		child_close_fds();
-		do_pwchange(s);
-		exit(1);
-	}
-
-	/* login(1) is only called if we execute the login shell */
-	if (options.use_login && command != NULL)
-		options.use_login = 0;
-
-#ifdef _UNICOS
-	cray_setup(pw->pw_uid, pw->pw_name, command);
-#endif /* _UNICOS */
-
-	/*
-	 * Login(1) does this as well, and it needs uid 0 for the "-h"
-	 * switch, so we let login(1) to this for us.
-	 */
-	if (!options.use_login) {
-#ifdef HAVE_OSF_SIA
-		session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
-		if (!check_quietlogin(s, command))
-			do_motd();
-#else /* HAVE_OSF_SIA */
-		/* When PAM is enabled we rely on it to do the nologin check */
-		if (!options.use_pam)
-			do_nologin(pw);
-		do_setusercontext(pw);
-		/*
-		 * PAM session modules in do_setusercontext may have
-		 * generated messages, so if this in an interactive
-		 * login then display them too.
-		 */
-		if (!check_quietlogin(s, command))
-			display_loginmsg();
-#endif /* HAVE_OSF_SIA */
-	}
-
-#ifdef USE_PAM
-	if (options.use_pam && !options.use_login && !is_pam_session_open()) {
-		debug3("PAM session not opened, exiting");
-		display_loginmsg();
-		exit(254);
-	}
-#endif
-
-	/*
-	 * 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;
-
-	/*
-	 * Make sure $SHELL points to the shell from the password file,
-	 * even if shell is overridden from login.conf
-	 */
-	env = do_setup_env(s, shell);
-
-#ifdef HAVE_LOGIN_CAP
-	shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
-#endif
-
-	/* we have to stash the hostname before we close our socket. */
-	if (options.use_login)
-		hostname = get_remote_name_or_ip(utmp_len,
-		    options.use_dns);
-	/*
-	 * 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.
-	 */
-	child_close_fds();
-
-	/*
-	 * Must take new environment into use so that .ssh/rc,
-	 * /etc/ssh/sshrc and xauth are run in the proper environment.
-	 */
-	environ = env;
-
-#if defined(KRB5) && defined(USE_AFS)
-	/*
-	 * At this point, we check to see if AFS is active and if we have
-	 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
-	 * if we can (and need to) extend the ticket into an AFS token. If
-	 * we don't do this, we run into potential problems if the user's
-	 * home directory is in AFS and it's not world-readable.
-	 */
-
-	if (options.kerberos_get_afs_token && k_hasafs() &&
-	    (s->authctxt->krb5_ctx != NULL)) {
-		char cell[64];
-
-		debug("Getting AFS token");
-
-		k_setpag();
-
-		if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
-			krb5_afslog(s->authctxt->krb5_ctx,
-			    s->authctxt->krb5_fwd_ccache, cell, NULL);
-
-		krb5_afslog_home(s->authctxt->krb5_ctx,
-		    s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
-	}
-#endif
-
-	/* Change current directory to the user's home directory. */
-	if (chdir(pw->pw_dir) < 0) {
-		fprintf(stderr, "Could not chdir to home directory %s: %s\n",
-		    pw->pw_dir, strerror(errno));
-#ifdef HAVE_LOGIN_CAP
-		if (login_getcapbool(lc, "requirehome", 0))
-			exit(1);
-#endif
-	}
-
-	if (!options.use_login)
-		do_rc_files(s, shell);
-
-	/* restore SIGPIPE for child */
-	signal(SIGPIPE, SIG_DFL);
-
-	if (options.use_login) {
-		launch_login(pw, hostname);
-		/* NEVERREACHED */
-	}
-
-	/* 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->x11_chanids = 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 || !authctxt->valid)
-		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;
-}
-
-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;
-}
-
-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_x11_channel(int id)
-{
-	int i, j;
-
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-
-		if (s->x11_chanids == NULL || !s->used)
-			continue;
-		for (j = 0; s->x11_chanids[j] != -1; j++) {
-			if (s->x11_chanids[j] == id) {
-				debug("session_by_x11_channel: session %d "
-				    "channel %d", s->self, id);
-				return s;
-			}
-		}
-	}
-	debug("session_by_x11_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;
-	}
-
-	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 (!PRIVSEP(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);
-
-	if (!use_privsep)
-		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();
-	logit("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 (stat(prog, &st) < 0) {
-				error("subsystem: cannot stat %s: %s", prog,
-				    strerror(errno));
-				break;
-			}
-			debug("subsystem: exec() %s", cmd);
-			s->is_subsystem = 1;
-			do_exec(s, cmd);
-			success = 1;
-			break;
-		}
-	}
-
-	if (!success)
-		logit("subsystem request for %.100s failed, subsystem not found",
-		    subsys);
-
-	xfree(subsys);
-	return success;
-}
-
-static int
-session_x11_req(Session *s)
-{
-	int success;
-
-	if (s->auth_proto != NULL || s->auth_data != NULL) {
-		error("session_x11_req: session %d: "
-		    "x11 forwarding already active", s->self);
-		return 0;
-	}
-	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;
-}
-
-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_break_req(Session *s)
-{
-
-	packet_get_int();	/* ignored */
-	packet_check_eom();
-
-	if (s->ttyfd == -1 ||
-	    tcsendbreak(s->ttyfd, 0) < 0)
-		return 0;
-	return 1;
-}
-
-static int
-session_env_req(Session *s)
-{
-	char *name, *val;
-	u_int name_len, val_len, i;
-
-	name = packet_get_string(&name_len);
-	val = packet_get_string(&val_len);
-	packet_check_eom();
-
-	/* Don't set too many environment variables */
-	if (s->num_env > 128) {
-		debug2("Ignoring env request %s: too many env vars", name);
-		goto fail;
-	}
-
-	for (i = 0; i < options.num_accept_env; i++) {
-		if (match_pattern(name, options.accept_env[i])) {
-			debug2("Setting env %d: %s=%s", s->num_env, name, val);
-			s->env = xrealloc(s->env, s->num_env + 1,
-			    sizeof(*s->env));
-			s->env[s->num_env].name = name;
-			s->env[s->num_env].val = val;
-			s->num_env++;
-			return (1);
-		}
-	}
-	debug2("Ignoring env request %s: disallowed name", name);
-
- fail:
-	xfree(name);
-	xfree(val);
-	return (0);
-}
-
-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);
-	}
-}
-
-int
-session_input_channel_req(Channel *c, const char *rtype)
-{
-	int success = 0;
-	Session *s;
-
-	if ((s = session_by_channel(c->self)) == NULL) {
-		logit("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);
-	} else if (strcmp(rtype, "break") == 0) {
-		success = session_break_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(Session *s)
-{
-	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);
-
-	/* Record that the user has logged out. */
-	if (s->pid != 0)
-		record_logout(s->pid, s->tty, s->pw->pw_name);
-
-	/* 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(Session *s)
-{
-	PRIVSEP(session_pty_cleanup2(s));
-}
-
-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_close_x11(int id)
-{
-	Channel *c;
-
-	if ((c = channel_by_id(id)) == NULL) {
-		debug("session_close_x11: x11 channel %d missing", id);
-	} else {
-		/* Detach X11 listener */
-		debug("session_close_x11: detach x11 channel %d", id);
-		channel_cancel_cleanup(id);
-		if (c->ostate != CHAN_OUTPUT_CLOSED)
-			chan_mark_dead(c);
-	}
-}
-
-static void
-session_close_single_x11(int id, void *arg)
-{
-	Session *s;
-	u_int i;
-
-	debug3("session_close_single_x11: channel %d", id);
-	channel_cancel_cleanup(id);
-	if ((s  = session_by_x11_channel(id)) == NULL)
-		fatal("session_close_single_x11: no x11 channel %d", id);
-	for (i = 0; s->x11_chanids[i] != -1; i++) {
-		debug("session_close_single_x11: session %d: "
-		    "closing channel %d", s->self, s->x11_chanids[i]);
-		/*
-		 * The channel "id" is already closing, but make sure we
-		 * close all of its siblings.
-		 */
-		if (s->x11_chanids[i] != id)
-			session_close_x11(s->x11_chanids[i]);
-	}
-	xfree(s->x11_chanids);
-	s->x11_chanids = NULL;
-	if (s->display) {
-		xfree(s->display);
-		s->display = NULL;
-	}
-	if (s->auth_proto) {
-		xfree(s->auth_proto);
-		s->auth_proto = NULL;
-	}
-	if (s->auth_data) {
-		xfree(s->auth_data);
-		s->auth_data = NULL;
-	}
-	if (s->auth_display) {
-		xfree(s->auth_display);
-		s->auth_display = NULL;
-	}
-}
-
-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);
-	}
-
-	/* disconnect channel */
-	debug("session_exit_message: release channel %d", s->chanid);
-
-	/*
-	 * Adjust cleanup callback attachment to send close messages when
-	 * the channel gets EOF. The session will be then be closed
-	 * by session_close_by_channel when the childs close their fds.
-	 */
-	channel_register_cleanup(c->self, session_close_by_channel, 1);
-
-	/*
-	 * 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);
-}
-
-void
-session_close(Session *s)
-{
-	u_int i;
-
-	debug("session_close: session %d pid %ld", s->self, (long)s->pid);
-	if (s->ttyfd != -1)
-		session_pty_cleanup(s);
-	if (s->term)
-		xfree(s->term);
-	if (s->display)
-		xfree(s->display);
-	if (s->x11_chanids)
-		xfree(s->x11_chanids);
-	if (s->auth_display)
-		xfree(s->auth_display);
-	if (s->auth_data)
-		xfree(s->auth_data);
-	if (s->auth_proto)
-		xfree(s->auth_proto);
-	s->used = 0;
-	if (s->env != NULL) {
-		for (i = 0; i < s->num_env; i++) {
-			xfree(s->env[i].name);
-			xfree(s->env[i].val);
-		}
-		xfree(s->env);
-	}
-	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);
-	if (s->ttyfd != -1)
-		session_pty_cleanup(s);
-	s->pid = 0;
-}
-
-/*
- * this is called when a channel dies before
- * the session 'child' itself dies
- */
-void
-session_close_by_channel(int id, void *arg)
-{
-	Session *s = session_by_channel(id);
-	u_int i;
-
-	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)
-			session_pty_cleanup(s);
-		return;
-	}
-	/* detach by removing callback */
-	channel_cancel_cleanup(s->chanid);
-
-	/* Close any X11 listeners associated with this session */
-	if (s->x11_chanids != NULL) {
-		for (i = 0; s->x11_chanids[i] != -1; i++) {
-			session_close_x11(s->x11_chanids[i]);
-			s->x11_chanids[i] = -1;
-		}
-	}
-
-	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;
-	char *cp;
-
-	buf[0] = '\0';
-	for (i = 0; i < MAX_SESSIONS; i++) {
-		Session *s = &sessions[i];
-		if (s->used && s->ttyfd != -1) {
-
-			if (strncmp(s->tty, "/dev/", 5) != 0) {
-				cp = strrchr(s->tty, '/');
-				cp = (cp == NULL) ? s->tty : cp + 1;
-			} else
-				cp = s->tty + 5;
-
-			if (buf[0] != '\0')
-				strlcat(buf, ",", sizeof buf);
-			strlcat(buf, cp, 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];
-	u_int i;
-
-	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 (options.use_login) {
-		packet_send_debug("X11 forwarding disabled; "
-		    "not compatible with UseLogin=yes.");
-		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, &s->x11_chanids) == -1) {
-		debug("x11_create_display_inet failed.");
-		return 0;
-	}
-	for (i = 0; s->x11_chanids[i] != -1; i++) {
-		channel_register_cleanup(s->x11_chanids[i],
-		    session_close_single_x11, 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;
-}
-
-static void
-do_authenticated2(Authctxt *authctxt)
-{
-	server_loop2(authctxt);
-}
-
-void
-do_cleanup(Authctxt *authctxt)
-{
-	static int called = 0;
-
-	debug("do_cleanup");
-
-	/* no cleanup if we're in the child for login shell */
-	if (is_child)
-		return;
-
-	/* avoid double cleanup */
-	if (called)
-		return;
-	called = 1;
-
-	if (authctxt == NULL || !authctxt->authenticated)
-		return;
-#ifdef KRB5
-	if (options.kerberos_ticket_cleanup &&
-	    authctxt->krb5_ctx)
-		krb5_cleanup_proc(authctxt);
-#endif
-
-#ifdef GSSAPI
-	if (compat20 && options.gss_cleanup_creds)
-		ssh_gssapi_cleanup_creds();
-#endif
-
-#ifdef USE_PAM
-	if (options.use_pam) {
-		sshpam_cleanup();
-		sshpam_thread_cleanup();
-	}
-#endif
-
-	/* remove agent socket */
-	auth_sock_cleanup_proc(authctxt->pw);
-
-	/*
-	 * Cleanup ptys/utmp only if privsep is disabled,
-	 * or if running in monitor.
-	 */
-	if (!use_privsep || mm_is_monitor())
-		session_destroy_all(session_pty_cleanup2);
-}