Properly flatten openssh/dist.

1 files changed, 0 insertions, 1106 deletions

diff --git a/crypto/openssh/sshconnect.c b/crypto/openssh/sshconnect.c
deleted file mode 100644
index a222233..0000000
--- a/crypto/openssh/sshconnect.c
+++ /dev/null
@@ -1,1106 +0,0 @@
-/* $OpenBSD: sshconnect.c,v 1.200 2006/10/10 10:12:45 markus Exp $ */
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- *                    All rights reserved
- * Code to connect to a remote host, and to perform the client side of the
- * login (authentication) dialog.
- *
- * 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".
- */
-
-#include "includes.h"
-
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
-#ifdef HAVE_SYS_TIME_H
-# include <sys/time.h>
-#endif
-
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <netdb.h>
-#ifdef HAVE_PATHS_H
-#include <paths.h>
-#endif
-#include <pwd.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "xmalloc.h"
-#include "key.h"
-#include "hostfile.h"
-#include "ssh.h"
-#include "rsa.h"
-#include "buffer.h"
-#include "packet.h"
-#include "uidswap.h"
-#include "compat.h"
-#include "key.h"
-#include "sshconnect.h"
-#include "hostfile.h"
-#include "log.h"
-#include "readconf.h"
-#include "atomicio.h"
-#include "misc.h"
-#include "dns.h"
-#include "version.h"
-
-char *client_version_string = NULL;
-char *server_version_string = NULL;
-
-static int matching_host_key_dns = 0;
-
-/* import */
-extern Options options;
-extern char *__progname;
-extern uid_t original_real_uid;
-extern uid_t original_effective_uid;
-extern pid_t proxy_command_pid;
-
-#ifndef INET6_ADDRSTRLEN		/* for non IPv6 machines */
-#define INET6_ADDRSTRLEN 46
-#endif
-
-static int show_other_keys(const char *, Key *);
-static void warn_changed_key(Key *);
-
-/*
- * Connect to the given ssh server using a proxy command.
- */
-static int
-ssh_proxy_connect(const char *host, u_short port, const char *proxy_command)
-{
-	char *command_string, *tmp;
-	int pin[2], pout[2];
-	pid_t pid;
-	char strport[NI_MAXSERV];
-
-	/* Convert the port number into a string. */
-	snprintf(strport, sizeof strport, "%hu", port);
-
-	/*
-	 * Build the final command string in the buffer by making the
-	 * appropriate substitutions to the given proxy command.
-	 *
-	 * Use "exec" to avoid "sh -c" processes on some platforms
-	 * (e.g. Solaris)
-	 */
-	xasprintf(&tmp, "exec %s", proxy_command);
-	command_string = percent_expand(tmp, "h", host,
-	    "p", strport, (char *)NULL);
-	xfree(tmp);
-
-	/* Create pipes for communicating with the proxy. */
-	if (pipe(pin) < 0 || pipe(pout) < 0)
-		fatal("Could not create pipes to communicate with the proxy: %.100s",
-		    strerror(errno));
-
-	debug("Executing proxy command: %.500s", command_string);
-
-	/* Fork and execute the proxy command. */
-	if ((pid = fork()) == 0) {
-		char *argv[10];
-
-		/* Child.  Permanently give up superuser privileges. */
-		permanently_drop_suid(original_real_uid);
-
-		/* Redirect stdin and stdout. */
-		close(pin[1]);
-		if (pin[0] != 0) {
-			if (dup2(pin[0], 0) < 0)
-				perror("dup2 stdin");
-			close(pin[0]);
-		}
-		close(pout[0]);
-		if (dup2(pout[1], 1) < 0)
-			perror("dup2 stdout");
-		/* Cannot be 1 because pin allocated two descriptors. */
-		close(pout[1]);
-
-		/* Stderr is left as it is so that error messages get
-		   printed on the user's terminal. */
-		argv[0] = _PATH_BSHELL;
-		argv[1] = "-c";
-		argv[2] = command_string;
-		argv[3] = NULL;
-
-		/* Execute the proxy command.  Note that we gave up any
-		   extra privileges above. */
-		execv(argv[0], argv);
-		perror(argv[0]);
-		exit(1);
-	}
-	/* Parent. */
-	if (pid < 0)
-		fatal("fork failed: %.100s", strerror(errno));
-	else
-		proxy_command_pid = pid; /* save pid to clean up later */
-
-	/* Close child side of the descriptors. */
-	close(pin[0]);
-	close(pout[1]);
-
-	/* Free the command name. */
-	xfree(command_string);
-
-	/* Set the connection file descriptors. */
-	packet_set_connection(pout[0], pin[1]);
-
-	/* Indicate OK return */
-	return 0;
-}
-
-/*
- * Creates a (possibly privileged) socket for use as the ssh connection.
- */
-static int
-ssh_create_socket(int privileged, struct addrinfo *ai)
-{
-	int sock, gaierr;
-	struct addrinfo hints, *res;
-
-	/*
-	 * If we are running as root and want to connect to a privileged
-	 * port, bind our own socket to a privileged port.
-	 */
-	if (privileged) {
-		int p = IPPORT_RESERVED - 1;
-		PRIV_START;
-		sock = rresvport_af(&p, ai->ai_family);
-		PRIV_END;
-		if (sock < 0)
-			error("rresvport: af=%d %.100s", ai->ai_family,
-			    strerror(errno));
-		else
-			debug("Allocated local port %d.", p);
-		return sock;
-	}
-	sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
-	if (sock < 0)
-		error("socket: %.100s", strerror(errno));
-
-	/* Bind the socket to an alternative local IP address */
-	if (options.bind_address == NULL)
-		return sock;
-
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = ai->ai_family;
-	hints.ai_socktype = ai->ai_socktype;
-	hints.ai_protocol = ai->ai_protocol;
-	hints.ai_flags = AI_PASSIVE;
-	gaierr = getaddrinfo(options.bind_address, "0", &hints, &res);
-	if (gaierr) {
-		error("getaddrinfo: %s: %s", options.bind_address,
-		    gai_strerror(gaierr));
-		close(sock);
-		return -1;
-	}
-	if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) {
-		error("bind: %s: %s", options.bind_address, strerror(errno));
-		close(sock);
-		freeaddrinfo(res);
-		return -1;
-	}
-	freeaddrinfo(res);
-	return sock;
-}
-
-static int
-timeout_connect(int sockfd, const struct sockaddr *serv_addr,
-    socklen_t addrlen, int timeout)
-{
-	fd_set *fdset;
-	struct timeval tv;
-	socklen_t optlen;
-	int optval, rc, result = -1;
-
-	if (timeout <= 0)
-		return (connect(sockfd, serv_addr, addrlen));
-
-	set_nonblock(sockfd);
-	rc = connect(sockfd, serv_addr, addrlen);
-	if (rc == 0) {
-		unset_nonblock(sockfd);
-		return (0);
-	}
-	if (errno != EINPROGRESS)
-		return (-1);
-
-	fdset = (fd_set *)xcalloc(howmany(sockfd + 1, NFDBITS),
-	    sizeof(fd_mask));
-	FD_SET(sockfd, fdset);
-	tv.tv_sec = timeout;
-	tv.tv_usec = 0;
-
-	for (;;) {
-		rc = select(sockfd + 1, NULL, fdset, NULL, &tv);
-		if (rc != -1 || errno != EINTR)
-			break;
-	}
-
-	switch (rc) {
-	case 0:
-		/* Timed out */
-		errno = ETIMEDOUT;
-		break;
-	case -1:
-		/* Select error */
-		debug("select: %s", strerror(errno));
-		break;
-	case 1:
-		/* Completed or failed */
-		optval = 0;
-		optlen = sizeof(optval);
-		if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval,
-		    &optlen) == -1) {
-			debug("getsockopt: %s", strerror(errno));
-			break;
-		}
-		if (optval != 0) {
-			errno = optval;
-			break;
-		}
-		result = 0;
-		unset_nonblock(sockfd);
-		break;
-	default:
-		/* Should not occur */
-		fatal("Bogus return (%d) from select()", rc);
-	}
-
-	xfree(fdset);
-	return (result);
-}
-
-/*
- * Opens a TCP/IP connection to the remote server on the given host.
- * The address of the remote host will be returned in hostaddr.
- * If port is 0, the default port will be used.  If needpriv is true,
- * a privileged port will be allocated to make the connection.
- * This requires super-user privileges if needpriv is true.
- * Connection_attempts specifies the maximum number of tries (one per
- * second).  If proxy_command is non-NULL, it specifies the command (with %h
- * and %p substituted for host and port, respectively) to use to contact
- * the daemon.
- */
-int
-ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
-    u_short port, int family, int connection_attempts,
-    int needpriv, const char *proxy_command)
-{
-	int gaierr;
-	int on = 1;
-	int sock = -1, attempt;
-	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
-	struct addrinfo hints, *ai, *aitop;
-
-	debug2("ssh_connect: needpriv %d", needpriv);
-
-	/* If a proxy command is given, connect using it. */
-	if (proxy_command != NULL)
-		return ssh_proxy_connect(host, port, proxy_command);
-
-	/* No proxy command. */
-
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = family;
-	hints.ai_socktype = SOCK_STREAM;
-	snprintf(strport, sizeof strport, "%u", port);
-	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
-		fatal("%s: %.100s: %s", __progname, host,
-		    gai_strerror(gaierr));
-
-	for (attempt = 0; attempt < connection_attempts; attempt++) {
-		if (attempt > 0) {
-			/* Sleep a moment before retrying. */
-			sleep(1);
-			debug("Trying again...");
-		}
-		/*
-		 * Loop through addresses for this host, and try each one in
-		 * sequence until the connection succeeds.
-		 */
-		for (ai = aitop; ai; ai = ai->ai_next) {
-			if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
-				continue;
-			if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
-			    ntop, sizeof(ntop), strport, sizeof(strport),
-			    NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
-				error("ssh_connect: getnameinfo failed");
-				continue;
-			}
-			debug("Connecting to %.200s [%.100s] port %s.",
-				host, ntop, strport);
-
-			/* Create a socket for connecting. */
-			sock = ssh_create_socket(needpriv, ai);
-			if (sock < 0)
-				/* Any error is already output */
-				continue;
-
-			if (timeout_connect(sock, ai->ai_addr, ai->ai_addrlen,
-			    options.connection_timeout) >= 0) {
-				/* Successful connection. */
-				memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen);
-				break;
-			} else {
-				debug("connect to address %s port %s: %s",
-				    ntop, strport, strerror(errno));
-				close(sock);
-				sock = -1;
-			}
-		}
-		if (sock != -1)
-			break;	/* Successful connection. */
-	}
-
-	freeaddrinfo(aitop);
-
-	/* Return failure if we didn't get a successful connection. */
-	if (sock == -1) {
-		error("ssh: connect to host %s port %s: %s",
-		    host, strport, strerror(errno));
-		return (-1);
-	}
-
-	debug("Connection established.");
-
-	/* Set SO_KEEPALIVE if requested. */
-	if (options.tcp_keep_alive &&
-	    setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on,
-	    sizeof(on)) < 0)
-		error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
-
-	/* Set the connection. */
-	packet_set_connection(sock, sock);
-
-	return 0;
-}
-
-/*
- * Waits for the server identification string, and sends our own
- * identification string.
- */
-static void
-ssh_exchange_identification(void)
-{
-	char buf[256], remote_version[256];	/* must be same size! */
-	int remote_major, remote_minor, mismatch;
-	int connection_in = packet_get_connection_in();
-	int connection_out = packet_get_connection_out();
-	int minor1 = PROTOCOL_MINOR_1;
-	u_int i, n;
-
-	/* Read other side's version identification. */
-	for (n = 0;;) {
-		for (i = 0; i < sizeof(buf) - 1; i++) {
-			size_t len = atomicio(read, connection_in, &buf[i], 1);
-
-			if (len != 1 && errno == EPIPE)
-				fatal("ssh_exchange_identification: Connection closed by remote host");
-			else if (len != 1)
-				fatal("ssh_exchange_identification: read: %.100s", strerror(errno));
-			if (buf[i] == '\r') {
-				buf[i] = '\n';
-				buf[i + 1] = 0;
-				continue;		/**XXX wait for \n */
-			}
-			if (buf[i] == '\n') {
-				buf[i + 1] = 0;
-				break;
-			}
-			if (++n > 65536)
-				fatal("ssh_exchange_identification: No banner received");
-		}
-		buf[sizeof(buf) - 1] = 0;
-		if (strncmp(buf, "SSH-", 4) == 0)
-			break;
-		debug("ssh_exchange_identification: %s", buf);
-	}
-	server_version_string = xstrdup(buf);
-
-	/*
-	 * Check that the versions match.  In future this might accept
-	 * several versions and set appropriate flags to handle them.
-	 */
-	if (sscanf(server_version_string, "SSH-%d.%d-%[^\n]\n",
-	    &remote_major, &remote_minor, remote_version) != 3)
-		fatal("Bad remote protocol version identification: '%.100s'", buf);
-	debug("Remote protocol version %d.%d, remote software version %.100s",
-	    remote_major, remote_minor, remote_version);
-
-	compat_datafellows(remote_version);
-	mismatch = 0;
-
-	switch (remote_major) {
-	case 1:
-		if (remote_minor == 99 &&
-		    (options.protocol & SSH_PROTO_2) &&
-		    !(options.protocol & SSH_PROTO_1_PREFERRED)) {
-			enable_compat20();
-			break;
-		}
-		if (!(options.protocol & SSH_PROTO_1)) {
-			mismatch = 1;
-			break;
-		}
-		if (remote_minor < 3) {
-			fatal("Remote machine has too old SSH software version.");
-		} else if (remote_minor == 3 || remote_minor == 4) {
-			/* We speak 1.3, too. */
-			enable_compat13();
-			minor1 = 3;
-			if (options.forward_agent) {
-				logit("Agent forwarding disabled for protocol 1.3");
-				options.forward_agent = 0;
-			}
-		}
-		break;
-	case 2:
-		if (options.protocol & SSH_PROTO_2) {
-			enable_compat20();
-			break;
-		}
-		/* FALLTHROUGH */
-	default:
-		mismatch = 1;
-		break;
-	}
-	if (mismatch)
-		fatal("Protocol major versions differ: %d vs. %d",
-		    (options.protocol & SSH_PROTO_2) ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
-		    remote_major);
-	/* Send our own protocol version identification. */
-	snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n",
-	    compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1,
-	    compat20 ? PROTOCOL_MINOR_2 : minor1,
-	    SSH_VERSION);
-	if (atomicio(vwrite, connection_out, buf, strlen(buf)) != strlen(buf))
-		fatal("write: %.100s", strerror(errno));
-	client_version_string = xstrdup(buf);
-	chop(client_version_string);
-	chop(server_version_string);
-	debug("Local version string %.100s", client_version_string);
-}
-
-/* defaults to 'no' */
-static int
-confirm(const char *prompt)
-{
-	const char *msg, *again = "Please type 'yes' or 'no': ";
-	char *p;
-	int ret = -1;
-
-	if (options.batch_mode)
-		return 0;
-	for (msg = prompt;;msg = again) {
-		p = read_passphrase(msg, RP_ECHO);
-		if (p == NULL ||
-		    (p[0] == '\0') || (p[0] == '\n') ||
-		    strncasecmp(p, "no", 2) == 0)
-			ret = 0;
-		if (p && strncasecmp(p, "yes", 3) == 0)
-			ret = 1;
-		if (p)
-			xfree(p);
-		if (ret != -1)
-			return ret;
-	}
-}
-
-/*
- * check whether the supplied host key is valid, return -1 if the key
- * is not valid. the user_hostfile will not be updated if 'readonly' is true.
- */
-#define RDRW	0
-#define RDONLY	1
-#define ROQUIET	2
-static int
-check_host_key(char *hostname, struct sockaddr *hostaddr, u_short port,
-    Key *host_key, int readonly, const char *user_hostfile,
-    const char *system_hostfile)
-{
-	Key *file_key;
-	const char *type = key_type(host_key);
-	char *ip = NULL, *host = NULL;
-	char hostline[1000], *hostp, *fp;
-	HostStatus host_status;
-	HostStatus ip_status;
-	int r, local = 0, host_ip_differ = 0;
-	int salen;
-	char ntop[NI_MAXHOST];
-	char msg[1024];
-	int len, host_line, ip_line;
-	const char *host_file = NULL, *ip_file = NULL;
-
-	/*
-	 * Force accepting of the host key for loopback/localhost. The
-	 * problem is that if the home directory is NFS-mounted to multiple
-	 * machines, localhost will refer to a different machine in each of
-	 * them, and the user will get bogus HOST_CHANGED warnings.  This
-	 * essentially disables host authentication for localhost; however,
-	 * this is probably not a real problem.
-	 */
-	/**  hostaddr == 0! */
-	switch (hostaddr->sa_family) {
-	case AF_INET:
-		local = (ntohl(((struct sockaddr_in *)hostaddr)->
-		    sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
-		salen = sizeof(struct sockaddr_in);
-		break;
-	case AF_INET6:
-		local = IN6_IS_ADDR_LOOPBACK(
-		    &(((struct sockaddr_in6 *)hostaddr)->sin6_addr));
-		salen = sizeof(struct sockaddr_in6);
-		break;
-	default:
-		local = 0;
-		salen = sizeof(struct sockaddr_storage);
-		break;
-	}
-	if (options.no_host_authentication_for_localhost == 1 && local &&
-	    options.host_key_alias == NULL) {
-		debug("Forcing accepting of host key for "
-		    "loopback/localhost.");
-		return 0;
-	}
-
-	/*
-	 * We don't have the remote ip-address for connections
-	 * using a proxy command
-	 */
-	if (options.proxy_command == NULL) {
-		if (getnameinfo(hostaddr, salen, ntop, sizeof(ntop),
-		    NULL, 0, NI_NUMERICHOST) != 0)
-			fatal("check_host_key: getnameinfo failed");
-		ip = put_host_port(ntop, port);
-	} else {
-		ip = xstrdup("<no hostip for proxy command>");
-	}
-	/*
-	 * Turn off check_host_ip if the connection is to localhost, via proxy
-	 * command or if we don't have a hostname to compare with
-	 */
-	if (options.check_host_ip && (local ||
-	    strcmp(hostname, ip) == 0 || options.proxy_command != NULL))
-		options.check_host_ip = 0;
-
-	/*
-	 * Allow the user to record the key under a different name or
-	 * differentiate a non-standard port.  This is useful for ssh
-	 * tunneling over forwarded connections or if you run multiple
-	 * sshd's on different ports on the same machine.
-	 */
-	if (options.host_key_alias != NULL) {
-		host = xstrdup(options.host_key_alias);
-		debug("using hostkeyalias: %s", host);
-	} else {
-		host = put_host_port(hostname, port);
-	}
-
-	/*
-	 * Store the host key from the known host file in here so that we can
-	 * compare it with the key for the IP address.
-	 */
-	file_key = key_new(host_key->type);
-
-	/*
-	 * Check if the host key is present in the user's list of known
-	 * hosts or in the systemwide list.
-	 */
-	host_file = user_hostfile;
-	host_status = check_host_in_hostfile(host_file, host, host_key,
-	    file_key, &host_line);
-	if (host_status == HOST_NEW) {
-		host_file = system_hostfile;
-		host_status = check_host_in_hostfile(host_file, host, host_key,
-		    file_key, &host_line);
-	}
-	/*
-	 * Also perform check for the ip address, skip the check if we are
-	 * localhost or the hostname was an ip address to begin with
-	 */
-	if (options.check_host_ip) {
-		Key *ip_key = key_new(host_key->type);
-
-		ip_file = user_hostfile;
-		ip_status = check_host_in_hostfile(ip_file, ip, host_key,
-		    ip_key, &ip_line);
-		if (ip_status == HOST_NEW) {
-			ip_file = system_hostfile;
-			ip_status = check_host_in_hostfile(ip_file, ip,
-			    host_key, ip_key, &ip_line);
-		}
-		if (host_status == HOST_CHANGED &&
-		    (ip_status != HOST_CHANGED || !key_equal(ip_key, file_key)))
-			host_ip_differ = 1;
-
-		key_free(ip_key);
-	} else
-		ip_status = host_status;
-
-	key_free(file_key);
-
-	switch (host_status) {
-	case HOST_OK:
-		/* The host is known and the key matches. */
-		debug("Host '%.200s' is known and matches the %s host key.",
-		    host, type);
-		debug("Found key in %s:%d", host_file, host_line);
-		if (options.check_host_ip && ip_status == HOST_NEW) {
-			if (readonly)
-				logit("%s host key for IP address "
-				    "'%.128s' not in list of known hosts.",
-				    type, ip);
-			else if (!add_host_to_hostfile(user_hostfile, ip,
-			    host_key, options.hash_known_hosts))
-				logit("Failed to add the %s host key for IP "
-				    "address '%.128s' to the list of known "
-				    "hosts (%.30s).", type, ip, user_hostfile);
-			else
-				logit("Warning: Permanently added the %s host "
-				    "key for IP address '%.128s' to the list "
-				    "of known hosts.", type, ip);
-		}
-		break;
-	case HOST_NEW:
-		if (options.host_key_alias == NULL && port != 0 &&
-		    port != SSH_DEFAULT_PORT) {
-			debug("checking without port identifier");
-			if (check_host_key(hostname, hostaddr, 0, host_key, 2,
-			    user_hostfile, system_hostfile) == 0) {
-				debug("found matching key w/out port");
-				break;
-			}
-		}
-		if (readonly)
-			goto fail;
-		/* The host is new. */
-		if (options.strict_host_key_checking == 1) {
-			/*
-			 * User has requested strict host key checking.  We
-			 * will not add the host key automatically.  The only
-			 * alternative left is to abort.
-			 */
-			error("No %s host key is known for %.200s and you "
-			    "have requested strict checking.", type, host);
-			goto fail;
-		} else if (options.strict_host_key_checking == 2) {
-			char msg1[1024], msg2[1024];
-
-			if (show_other_keys(host, host_key))
-				snprintf(msg1, sizeof(msg1),
-				    "\nbut keys of different type are already"
-				    " known for this host.");
-			else
-				snprintf(msg1, sizeof(msg1), ".");
-			/* The default */
-			fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
-			msg2[0] = '\0';
-			if (options.verify_host_key_dns) {
-				if (matching_host_key_dns)
-					snprintf(msg2, sizeof(msg2),
-					    "Matching host key fingerprint"
-					    " found in DNS.\n");
-				else
-					snprintf(msg2, sizeof(msg2),
-					    "No matching host key fingerprint"
-					    " found in DNS.\n");
-			}
-			snprintf(msg, sizeof(msg),
-			    "The authenticity of host '%.200s (%s)' can't be "
-			    "established%s\n"
-			    "%s key fingerprint is %s.\n%s"
-			    "Are you sure you want to continue connecting "
-			    "(yes/no)? ",
-			    host, ip, msg1, type, fp, msg2);
-			xfree(fp);
-			if (!confirm(msg))
-				goto fail;
-		}
-		/*
-		 * If not in strict mode, add the key automatically to the
-		 * local known_hosts file.
-		 */
-		if (options.check_host_ip && ip_status == HOST_NEW) {
-			snprintf(hostline, sizeof(hostline), "%s,%s",
-			    host, ip);
-			hostp = hostline;
-			if (options.hash_known_hosts) {
-				/* Add hash of host and IP separately */
-				r = add_host_to_hostfile(user_hostfile, host,
-				    host_key, options.hash_known_hosts) &&
-				    add_host_to_hostfile(user_hostfile, ip,
-				    host_key, options.hash_known_hosts);
-			} else {
-				/* Add unhashed "host,ip" */
-				r = add_host_to_hostfile(user_hostfile,
-				    hostline, host_key,
-				    options.hash_known_hosts);
-			}
-		} else {
-			r = add_host_to_hostfile(user_hostfile, host, host_key,
-			    options.hash_known_hosts);
-			hostp = host;
-		}
-
-		if (!r)
-			logit("Failed to add the host to the list of known "
-			    "hosts (%.500s).", user_hostfile);
-		else
-			logit("Warning: Permanently added '%.200s' (%s) to the "
-			    "list of known hosts.", hostp, type);
-		break;
-	case HOST_CHANGED:
-		if (readonly == ROQUIET)
-			goto fail;
-		if (options.check_host_ip && host_ip_differ) {
-			char *key_msg;
-			if (ip_status == HOST_NEW)
-				key_msg = "is unknown";
-			else if (ip_status == HOST_OK)
-				key_msg = "is unchanged";
-			else
-				key_msg = "has a different value";
-			error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
-			error("@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @");
-			error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
-			error("The %s host key for %s has changed,", type, host);
-			error("and the key for the according IP address %s", ip);
-			error("%s. This could either mean that", key_msg);
-			error("DNS SPOOFING is happening or the IP address for the host");
-			error("and its host key have changed at the same time.");
-			if (ip_status != HOST_NEW)
-				error("Offending key for IP in %s:%d", ip_file, ip_line);
-		}
-		/* The host key has changed. */
-		warn_changed_key(host_key);
-		error("Add correct host key in %.100s to get rid of this message.",
-		    user_hostfile);
-		error("Offending key in %s:%d", host_file, host_line);
-
-		/*
-		 * If strict host key checking is in use, the user will have
-		 * to edit the key manually and we can only abort.
-		 */
-		if (options.strict_host_key_checking) {
-			error("%s host key for %.200s has changed and you have "
-			    "requested strict checking.", type, host);
-			goto fail;
-		}
-
-		/*
-		 * If strict host key checking has not been requested, allow
-		 * the connection but without MITM-able authentication or
-		 * forwarding.
-		 */
-		if (options.password_authentication) {
-			error("Password authentication is disabled to avoid "
-			    "man-in-the-middle attacks.");
-			options.password_authentication = 0;
-		}
-		if (options.kbd_interactive_authentication) {
-			error("Keyboard-interactive authentication is disabled"
-			    " to avoid man-in-the-middle attacks.");
-			options.kbd_interactive_authentication = 0;
-			options.challenge_response_authentication = 0;
-		}
-		if (options.challenge_response_authentication) {
-			error("Challenge/response authentication is disabled"
-			    " to avoid man-in-the-middle attacks.");
-			options.challenge_response_authentication = 0;
-		}
-		if (options.forward_agent) {
-			error("Agent forwarding is disabled to avoid "
-			    "man-in-the-middle attacks.");
-			options.forward_agent = 0;
-		}
-		if (options.forward_x11) {
-			error("X11 forwarding is disabled to avoid "
-			    "man-in-the-middle attacks.");
-			options.forward_x11 = 0;
-		}
-		if (options.num_local_forwards > 0 ||
-		    options.num_remote_forwards > 0) {
-			error("Port forwarding is disabled to avoid "
-			    "man-in-the-middle attacks.");
-			options.num_local_forwards =
-			    options.num_remote_forwards = 0;
-		}
-		if (options.tun_open != SSH_TUNMODE_NO) {
-			error("Tunnel forwarding is disabled to avoid "
-			    "man-in-the-middle attacks.");
-			options.tun_open = SSH_TUNMODE_NO;
-		}
-		/*
-		 * XXX Should permit the user to change to use the new id.
-		 * This could be done by converting the host key to an
-		 * identifying sentence, tell that the host identifies itself
-		 * by that sentence, and ask the user if he/she whishes to
-		 * accept the authentication.
-		 */
-		break;
-	case HOST_FOUND:
-		fatal("internal error");
-		break;
-	}
-
-	if (options.check_host_ip && host_status != HOST_CHANGED &&
-	    ip_status == HOST_CHANGED) {
-		snprintf(msg, sizeof(msg),
-		    "Warning: the %s host key for '%.200s' "
-		    "differs from the key for the IP address '%.128s'"
-		    "\nOffending key for IP in %s:%d",
-		    type, host, ip, ip_file, ip_line);
-		if (host_status == HOST_OK) {
-			len = strlen(msg);
-			snprintf(msg + len, sizeof(msg) - len,
-			    "\nMatching host key in %s:%d",
-			    host_file, host_line);
-		}
-		if (options.strict_host_key_checking == 1) {
-			logit("%s", msg);
-			error("Exiting, you have requested strict checking.");
-			goto fail;
-		} else if (options.strict_host_key_checking == 2) {
-			strlcat(msg, "\nAre you sure you want "
-			    "to continue connecting (yes/no)? ", sizeof(msg));
-			if (!confirm(msg))
-				goto fail;
-		} else {
-			logit("%s", msg);
-		}
-	}
-
-	xfree(ip);
-	xfree(host);
-	return 0;
-
-fail:
-	xfree(ip);
-	xfree(host);
-	return -1;
-}
-
-/* returns 0 if key verifies or -1 if key does NOT verify */
-int
-verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
-{
-	struct stat st;
-	int flags = 0;
-
-	if (options.verify_host_key_dns &&
-	    verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) {
-
-		if (flags & DNS_VERIFY_FOUND) {
-
-			if (options.verify_host_key_dns == 1 &&
-			    flags & DNS_VERIFY_MATCH &&
-			    flags & DNS_VERIFY_SECURE)
-				return 0;
-
-			if (flags & DNS_VERIFY_MATCH) {
-				matching_host_key_dns = 1;
-			} else {
-				warn_changed_key(host_key);
-				error("Update the SSHFP RR in DNS with the new "
-				    "host key to get rid of this message.");
-			}
-		}
-	}
-
-	/* return ok if the key can be found in an old keyfile */
-	if (stat(options.system_hostfile2, &st) == 0 ||
-	    stat(options.user_hostfile2, &st) == 0) {
-		if (check_host_key(host, hostaddr, options.port, host_key,
-		    RDONLY, options.user_hostfile2,
-		    options.system_hostfile2) == 0)
-			return 0;
-	}
-	return check_host_key(host, hostaddr, options.port, host_key,
-	    RDRW, options.user_hostfile, options.system_hostfile);
-}
-
-/*
- * Starts a dialog with the server, and authenticates the current user on the
- * server.  This does not need any extra privileges.  The basic connection
- * to the server must already have been established before this is called.
- * If login fails, this function prints an error and never returns.
- * This function does not require super-user privileges.
- */
-void
-ssh_login(Sensitive *sensitive, const char *orighost,
-    struct sockaddr *hostaddr, struct passwd *pw)
-{
-	char *host, *cp;
-	char *server_user, *local_user;
-
-	local_user = xstrdup(pw->pw_name);
-	server_user = options.user ? options.user : local_user;
-
-	/* Convert the user-supplied hostname into all lowercase. */
-	host = xstrdup(orighost);
-	for (cp = host; *cp; cp++)
-		if (isupper(*cp))
-			*cp = (char)tolower(*cp);
-
-	/* Exchange protocol version identification strings with the server. */
-	ssh_exchange_identification();
-
-	/* Put the connection into non-blocking mode. */
-	packet_set_nonblocking();
-
-	/* key exchange */
-	/* authenticate user */
-	if (compat20) {
-		ssh_kex2(host, hostaddr);
-		ssh_userauth2(local_user, server_user, host, sensitive);
-	} else {
-		ssh_kex(host, hostaddr);
-		ssh_userauth1(local_user, server_user, host, sensitive);
-	}
-	xfree(local_user);
-}
-
-void
-ssh_put_password(char *password)
-{
-	int size;
-	char *padded;
-
-	if (datafellows & SSH_BUG_PASSWORDPAD) {
-		packet_put_cstring(password);
-		return;
-	}
-	size = roundup(strlen(password) + 1, 32);
-	padded = xcalloc(1, size);
-	strlcpy(padded, password, size);
-	packet_put_string(padded, size);
-	memset(padded, 0, size);
-	xfree(padded);
-}
-
-static int
-show_key_from_file(const char *file, const char *host, int keytype)
-{
-	Key *found;
-	char *fp;
-	int line, ret;
-
-	found = key_new(keytype);
-	if ((ret = lookup_key_in_hostfile_by_type(file, host,
-	    keytype, found, &line))) {
-		fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX);
-		logit("WARNING: %s key found for host %s\n"
-		    "in %s:%d\n"
-		    "%s key fingerprint %s.",
-		    key_type(found), host, file, line,
-		    key_type(found), fp);
-		xfree(fp);
-	}
-	key_free(found);
-	return (ret);
-}
-
-/* print all known host keys for a given host, but skip keys of given type */
-static int
-show_other_keys(const char *host, Key *key)
-{
-	int type[] = { KEY_RSA1, KEY_RSA, KEY_DSA, -1};
-	int i, found = 0;
-
-	for (i = 0; type[i] != -1; i++) {
-		if (type[i] == key->type)
-			continue;
-		if (type[i] != KEY_RSA1 &&
-		    show_key_from_file(options.user_hostfile2, host, type[i])) {
-			found = 1;
-			continue;
-		}
-		if (type[i] != KEY_RSA1 &&
-		    show_key_from_file(options.system_hostfile2, host, type[i])) {
-			found = 1;
-			continue;
-		}
-		if (show_key_from_file(options.user_hostfile, host, type[i])) {
-			found = 1;
-			continue;
-		}
-		if (show_key_from_file(options.system_hostfile, host, type[i])) {
-			found = 1;
-			continue;
-		}
-		debug2("no key of type %d for host %s", type[i], host);
-	}
-	return (found);
-}
-
-static void
-warn_changed_key(Key *host_key)
-{
-	char *fp;
-	const char *type = key_type(host_key);
-
-	fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
-
-	error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
-	error("@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @");
-	error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
-	error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!");
-	error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!");
-	error("It is also possible that the %s host key has just been changed.", type);
-	error("The fingerprint for the %s key sent by the remote host is\n%s.",
-	    type, fp);
-	error("Please contact your system administrator.");
-
-	xfree(fp);
-}
-
-/*
- * Execute a local command
- */
-int
-ssh_local_cmd(const char *args)
-{
-	char *shell;
-	pid_t pid;
-	int status;
-
-	if (!options.permit_local_command ||
-	    args == NULL || !*args)
-		return (1);
-
-	if ((shell = getenv("SHELL")) == NULL)
-		shell = _PATH_BSHELL;
-
-	pid = fork();
-	if (pid == 0) {
-		debug3("Executing %s -c \"%s\"", shell, args);
-		execl(shell, shell, "-c", args, (char *)NULL);
-		error("Couldn't execute %s -c \"%s\": %s",
-		    shell, args, strerror(errno));
-		_exit(1);
-	} else if (pid == -1)
-		fatal("fork failed: %.100s", strerror(errno));
-	while (waitpid(pid, &status, 0) == -1)
-		if (errno != EINTR)
-			fatal("Couldn't wait for child: %s", strerror(errno));
-
-	if (!WIFEXITED(status))
-		return (1);
-
-	return (WEXITSTATUS(status));
-}