Initial import of OpenSSH snapshot from 2000/05/30

Obtained from:	OpenBSD

13 files changed, 237 insertions, 239 deletions

diff --git a/crypto/openssh/auth.c b/crypto/openssh/auth.c
index d3425a2..20e9760 100644
--- a/crypto/openssh/auth.c
+++ b/crypto/openssh/auth.c
@@ -5,7 +5,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth.c,v 1.6 2000/04/26 21:28:31 markus Exp $");
+RCSID("$OpenBSD: auth.c,v 1.7 2000/05/17 21:37:24 deraadt Exp $");
 
 #include "xmalloc.h"
 #include "rsa.h"
@@ -45,14 +45,21 @@ allowed_user(struct passwd * pw)
 {
 	struct stat st;
 	struct group *grp;
+	char *shell;
 	int i;
 
 	/* Shouldn't be called if pw is NULL, but better safe than sorry... */
 	if (!pw)
 		return 0;
 
+	/*
+	 * 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;
+
 	/* deny if shell does not exists or is not executable */
-	if (stat(pw->pw_shell, &st) != 0)
+	if (stat(shell, &st) != 0)
 		return 0;
 	if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP))))
 		return 0;
diff --git a/crypto/openssh/cipher.c b/crypto/openssh/cipher.c
index bcaff02..ca77c6d 100644
--- a/crypto/openssh/cipher.c
+++ b/crypto/openssh/cipher.c
@@ -12,7 +12,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: cipher.c,v 1.26 2000/04/14 10:30:30 markus Exp $");
+RCSID("$Id: cipher.c,v 1.27 2000/05/22 18:42:00 markus Exp $");
 
 #include "ssh.h"
 #include "cipher.h"
@@ -178,7 +178,7 @@ ciphers_valid(const char *names)
 	char *p;
 	int i;
 
-	if (strcmp(names, "") == 0)
+	if (names == NULL || strcmp(names, "") == 0)
 		return 0;
 	ciphers = xstrdup(names);
 	for ((p = strtok(ciphers, CIPHER_SEP)); p; (p = strtok(NULL, CIPHER_SEP))) {
@@ -201,6 +201,8 @@ int
 cipher_number(const char *name)
 {
 	int i;
+	if (name == NULL)
+		return -1;
 	for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++)
 		if (strcmp(cipher_names[i], name) == 0 &&
 		    (cipher_mask() & (1 << i)))
diff --git a/crypto/openssh/compat.c b/crypto/openssh/compat.c
index 33e509c..1dd0c39 100644
--- a/crypto/openssh/compat.c
+++ b/crypto/openssh/compat.c
@@ -28,7 +28,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: compat.c,v 1.13 2000/05/08 17:42:24 markus Exp $");
+RCSID("$Id: compat.c,v 1.14 2000/05/22 18:42:01 markus Exp $");
 
 #include "ssh.h"
 #include "packet.h"
@@ -80,10 +80,12 @@ compat_datafellows(const char *version)
 int
 proto_spec(const char *spec)
 {
-	char *s = xstrdup(spec);
-	char *p;
+	char *s, *p;
 	int ret = SSH_PROTO_UNKNOWN;
 
+	if (spec == NULL)
+		return ret;
+	s = xstrdup(spec);
 	for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) {
 		switch(atoi(p)) {
 		case 1:
diff --git a/crypto/openssh/kex.c b/crypto/openssh/kex.c
index c10c77e..a6c8174 100644
--- a/crypto/openssh/kex.c
+++ b/crypto/openssh/kex.c
@@ -28,13 +28,14 @@
  */
 
 #include "includes.h"
-RCSID("$Id: kex.c,v 1.6 2000/05/08 17:42:25 markus Exp $");
+RCSID("$Id: kex.c,v 1.7 2000/05/25 20:45:20 markus Exp $");
 
 #include "ssh.h"
 #include "ssh2.h"
 #include "xmalloc.h"
 #include "buffer.h"
 #include "bufaux.h"
+#include "packet.h"
 #include "cipher.h"
 #include "compat.h"
 
@@ -49,15 +50,17 @@ RCSID("$Id: kex.c,v 1.6 2000/05/08 17:42:25 markus Exp $");
 
 #include "kex.h"
 
+#define KEX_COOKIE_LEN	16
+
 Buffer *
 kex_init(char *myproposal[PROPOSAL_MAX])
 {
-	char c = 0;
-	unsigned char cookie[16];
+	int first_kex_packet_follows = 0;
+	unsigned char cookie[KEX_COOKIE_LEN];
 	u_int32_t rand = 0;
 	int i;
 	Buffer *ki = xmalloc(sizeof(*ki));
-	for (i = 0; i < 16; i++) {
+	for (i = 0; i < KEX_COOKIE_LEN; i++) {
 		if (i % 4 == 0)
 			rand = arc4random();
 		cookie[i] = rand & 0xff;
@@ -67,11 +70,55 @@ kex_init(char *myproposal[PROPOSAL_MAX])
 	buffer_append(ki, (char *)cookie, sizeof cookie);
 	for (i = 0; i < PROPOSAL_MAX; i++)
 		buffer_put_cstring(ki, myproposal[i]);
-	buffer_append(ki, &c, 1); /* boolean   first_kex_packet_follows */
-	buffer_put_int(ki, 0);    /* uint32    0 (reserved for future extension) */
+	buffer_put_char(ki, first_kex_packet_follows);
+	buffer_put_int(ki, 0);				/* uint32 reserved */
 	return ki;
 }
 
+/* send kexinit, parse and save reply */
+void
+kex_exchange_kexinit(
+    Buffer *my_kexinit, Buffer *peer_kexint,
+    char *peer_proposal[PROPOSAL_MAX])
+{
+	int i;
+	char *ptr;
+	int plen;
+
+	debug("send KEXINIT");
+	packet_start(SSH2_MSG_KEXINIT);
+	packet_put_raw(buffer_ptr(my_kexinit), buffer_len(my_kexinit));	
+	packet_send();
+	packet_write_wait();
+	debug("done");
+
+	/*
+	 * read and save raw KEXINIT payload in buffer. this is used during
+	 * computation of the session_id and the session keys.
+	 */
+	debug("wait KEXINIT");
+	packet_read_expect(&plen, SSH2_MSG_KEXINIT);
+	ptr = packet_get_raw(&plen);
+	buffer_append(peer_kexint, ptr, plen);
+
+	/* parse packet and save algorithm proposal */
+	/* skip cookie */
+	for (i = 0; i < KEX_COOKIE_LEN; i++)
+		packet_get_char();
+	/* extract kex init proposal strings */
+	for (i = 0; i < PROPOSAL_MAX; i++) {
+		peer_proposal[i] = packet_get_string(NULL);
+		debug("got kexinit: %s", peer_proposal[i]);
+	}
+	/* first kex follow / reserved */
+	i = packet_get_char();
+	debug("first kex follow: %d ", i);
+	i = packet_get_int();
+	debug("reserved: %d ", i);
+	packet_done();
+	debug("done");
+}
+
 /* diffie-hellman-group1-sha1 */
 
 int
@@ -134,12 +181,6 @@ dh_new_group1()
 }
 
 void
-bignum_print(BIGNUM *b)
-{
-	BN_print_fp(stderr,b);
-}
-
-void
 dump_digest(unsigned char *digest, int len)
 {
 	int i;
@@ -246,10 +287,13 @@ char *
 get_match(char *client, char *server)
 {
 	char *sproposals[MAX_PROP];
-	char *p;
+	char *c, *s, *p, *ret;
 	int i, j, nproposals;
 
-	for ((p = strtok(server, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+	c = xstrdup(client);
+	s = xstrdup(server);
+
+	for ((p = strtok(s, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
 		if (i < MAX_PROP)
 			sproposals[i] = p;
 		else
@@ -257,11 +301,18 @@ get_match(char *client, char *server)
 	}
 	nproposals = i;
 
-	for ((p = strtok(client, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
-		for (j = 0; j < nproposals; j++)
-			if (strcmp(p, sproposals[j]) == 0)
-				return xstrdup(p);
+	for ((p = strtok(c, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
+		for (j = 0; j < nproposals; j++) {
+			if (strcmp(p, sproposals[j]) == 0) {
+				ret = xstrdup(p);
+				xfree(c);
+				xfree(s);
+				return ret;
+			}
+		}
 	}
+	xfree(c);
+	xfree(s);
 	return NULL;
 }
 void
@@ -355,7 +406,6 @@ choose_hostkeyalg(Kex *k, char *client, char *server)
 Kex *
 kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server)
 {
-	int i;
 	int mode;
 	int ctos;				/* direction: if true client-to-server */
 	int need;
@@ -383,10 +433,6 @@ kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server
 	choose_kex(k, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]);
 	choose_hostkeyalg(k, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS],
 	    sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]);
-	for (i = 0; i < PROPOSAL_MAX; i++) {
-		xfree(cprop[i]);
-		xfree(sprop[i]);
-	}
 	need = 0;
 	for (mode = 0; mode < MODE_MAX; mode++) {
 	    if (need < k->enc[mode].key_len)
@@ -396,9 +442,7 @@ kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server
 	    if (need < k->mac[mode].key_len)
 		    need = k->mac[mode].key_len;
 	}
-	/* need runden? */
-#define WE_NEED 32
-	k->we_need = WE_NEED;
+	/* XXX need runden? */
 	k->we_need = need;
 	return k;
 }
diff --git a/crypto/openssh/kex.h b/crypto/openssh/kex.h
index 5395ebc..7e5c670 100644
--- a/crypto/openssh/kex.h
+++ b/crypto/openssh/kex.h
@@ -91,12 +91,17 @@ struct Kex {
 };
 
 Buffer	*kex_init(char *myproposal[PROPOSAL_MAX]);
-int	dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
-DH	*dh_new_group1();
-Kex 	*kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server);
+void
+kex_exchange_kexinit(
+    Buffer *my_kexinit, Buffer *peer_kexint,
+    char *peer_proposal[PROPOSAL_MAX]);
+Kex *
+kex_choose_conf(char *cprop[PROPOSAL_MAX],
+    char *sprop[PROPOSAL_MAX], int server);
 int	kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret);
-void	bignum_print(BIGNUM *b);
 void	packet_set_kex(Kex *k);
+int	dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
+DH	*dh_new_group1();
 
 unsigned char *
 kex_hash(
diff --git a/crypto/openssh/lib/Makefile b/crypto/openssh/lib/Makefile
index 35de105..aae1677 100644
--- a/crypto/openssh/lib/Makefile
+++ b/crypto/openssh/lib/Makefile
@@ -5,7 +5,7 @@ SRCS=   authfd.c authfile.c bufaux.c buffer.c canohost.c channels.c \
 	cipher.c compat.c compress.c crc32.c deattack.c fingerprint.c \
 	hostfile.c log.c match.c mpaux.c nchan.c packet.c readpass.c \
 	rsa.c tildexpand.c ttymodes.c uidswap.c xmalloc.c atomicio.c \
-	key.c dispatch.c dsa.c kex.c hmac.c uuencode.c
+	key.c dispatch.c dsa.c kex.c hmac.c uuencode.c aux.c
 
 NOPROFILE= yes
 NOPIC=	yes
diff --git a/crypto/openssh/myproposal.h b/crypto/openssh/myproposal.h
index 8b24179..9611d89 100644
--- a/crypto/openssh/myproposal.h
+++ b/crypto/openssh/myproposal.h
@@ -6,7 +6,7 @@
 #define	KEX_DEFAULT_LANG	""
 
 
-static const char *myproposal[PROPOSAL_MAX] = {
+static char *myproposal[PROPOSAL_MAX] = {
 	KEX_DEFAULT_KEX,
 	KEX_DEFAULT_PK_ALG,
 	KEX_DEFAULT_ENCRYPT,
diff --git a/crypto/openssh/servconf.c b/crypto/openssh/servconf.c
index 57f7050..4e3e5cc 100644
--- a/crypto/openssh/servconf.c
+++ b/crypto/openssh/servconf.c
@@ -12,7 +12,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: servconf.c,v 1.40 2000/05/08 17:12:15 markus Exp $");
+RCSID("$Id: servconf.c,v 1.41 2000/05/22 18:42:01 markus Exp $");
 
 #include "ssh.h"
 #include "servconf.h"
@@ -588,6 +588,8 @@ parse_flag:
 
 		case sCiphers:
 			cp = strtok(NULL, WHITESPACE);
+			if (!cp)
+				fatal("%s line %d: Missing argument.", filename, linenum);
 			if (!ciphers_valid(cp))
 				fatal("%s line %d: Bad SSH2 cipher spec '%s'.",
 				    filename, linenum, cp ? cp : "<NONE>");
@@ -598,6 +600,8 @@ parse_flag:
 		case sProtocol:
 			intptr = &options->protocol;
 			cp = strtok(NULL, WHITESPACE);
+			if (!cp)
+				fatal("%s line %d: Missing argument.", filename, linenum);
 			value = proto_spec(cp);
 			if (value == SSH_PROTO_UNKNOWN)
 				fatal("%s line %d: Bad protocol spec '%s'.",
diff --git a/crypto/openssh/serverloop.c b/crypto/openssh/serverloop.c
index 9bf3127..74a800b 100644
--- a/crypto/openssh/serverloop.c
+++ b/crypto/openssh/serverloop.c
@@ -159,33 +159,37 @@ retry_select:
 
 	/* Initialize select() masks. */
 	FD_ZERO(readset);
+	FD_ZERO(writeset);
 
-	/*
-	 * Read packets from the client unless we have too much buffered
-	 * stdin or channel data.
-	 */
 	if (compat20) {
 		/* wrong: bad condition XXX */
 		if (channel_not_very_much_buffered_data())
 			FD_SET(connection_in, readset);
 	} else {
-		if (buffer_len(&stdin_buffer) < 4096 &&
+		/*
+		 * Read packets from the client unless we have too much
+		 * buffered stdin or channel data.
+		 */
+		if (buffer_len(&stdin_buffer) < buffer_high &&
 		    channel_not_very_much_buffered_data())
 			FD_SET(connection_in, readset);
+		/*
+		 * If there is not too much data already buffered going to
+		 * the client, try to get some more data from the program.
+		 */
+		if (packet_not_very_much_data_to_write()) {
+			if (!fdout_eof)
+				FD_SET(fdout, readset);
+			if (!fderr_eof)
+				FD_SET(fderr, readset);
+		}
+		/*
+		 * If we have buffered data, try to write some of that data
+		 * to the program.
+		 */
+		if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
+			FD_SET(fdin, writeset);
 	}
-
-	/*
-	 * If there is not too much data already buffered going to the
-	 * client, try to get some more data from the program.
-	 */
-	if (!compat20 && packet_not_very_much_data_to_write()) {
-		if (!fdout_eof)
-			FD_SET(fdout, readset);
-		if (!fderr_eof)
-			FD_SET(fderr, readset);
-	}
-	FD_ZERO(writeset);
-
 	/* Set masks for channel descriptors. */
 	channel_prepare_select(readset, writeset);
 
@@ -196,11 +200,6 @@ retry_select:
 	if (packet_have_data_to_write())
 		FD_SET(connection_out, writeset);
 
-	/* If we have buffered data, try to write some of that data to the
-	   program. */
-	if (!compat20 && fdin != -1 && buffer_len(&stdin_buffer) > 0)
-		FD_SET(fdin, writeset);
-
 	/* Update the maximum descriptor number if appropriate. */
 	if (channel_max_fd() > max_fd)
 		max_fd = channel_max_fd();
@@ -250,20 +249,15 @@ process_input(fd_set * readset)
 		if (len == 0) {
 			verbose("Connection closed by remote host.");
 			fatal_cleanup();
+		} else if (len < 0) {
+			if (errno != EINTR && errno != EAGAIN) {
+				verbose("Read error from remote host: %.100s", strerror(errno));
+				fatal_cleanup();
+			}
+		} else {
+			/* Buffer any received data. */
+			packet_process_incoming(buf, len);
 		}
-		/*
-		 * There is a kernel bug on Solaris that causes select to
-		 * sometimes wake up even though there is no data available.
-		 */
-		if (len < 0 && errno == EAGAIN)
-			len = 0;
-
-		if (len < 0) {
-			verbose("Read error from remote host: %.100s", strerror(errno));
-			fatal_cleanup();
-		}
-		/* Buffer any received data. */
-		packet_process_incoming(buf, len);
 	}
 	if (compat20)
 		return;
@@ -271,9 +265,11 @@ process_input(fd_set * readset)
 	/* Read and buffer any available stdout data from the program. */
 	if (!fdout_eof && FD_ISSET(fdout, readset)) {
 		len = read(fdout, buf, sizeof(buf));
-		if (len <= 0)
+		if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+			/* do nothing */
+		} else if (len <= 0) {
 			fdout_eof = 1;
-		else {
+		} else {
 			buffer_append(&stdout_buffer, buf, len);
 			fdout_bytes += len;
 		}
@@ -281,10 +277,13 @@ process_input(fd_set * readset)
 	/* Read and buffer any available stderr data from the program. */
 	if (!fderr_eof && FD_ISSET(fderr, readset)) {
 		len = read(fderr, buf, sizeof(buf));
-		if (len <= 0)
+		if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+			/* do nothing */
+		} else if (len <= 0) {
 			fderr_eof = 1;
-		else
+		} else {
 			buffer_append(&stderr_buffer, buf, len);
+		}
 	}
 }
 
@@ -300,7 +299,9 @@ process_output(fd_set * writeset)
 	if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
 		len = write(fdin, buffer_ptr(&stdin_buffer),
 		    buffer_len(&stdin_buffer));
-		if (len <= 0) {
+		if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
+			/* do nothing */
+		} else if (len <= 0) {
 #ifdef USE_PIPES
 			close(fdin);
 #else
@@ -367,6 +368,7 @@ process_buffered_input_packets()
 void
 server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
 {
+	fd_set readset, writeset;
 	int wait_status;	/* Status returned by wait(). */
 	pid_t wait_pid;		/* pid returned by wait(). */
 	int waiting_termination = 0;	/* Have displayed waiting close message. */
@@ -386,6 +388,14 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
 	fdin = fdin_arg;
 	fdout = fdout_arg;
 	fderr = fderr_arg;
+
+	/* nonblocking IO */
+	set_nonblock(fdin);
+	set_nonblock(fdout);
+	/* we don't have stderr for interactive terminal sessions, see below */
+	if (fderr != -1)
+		set_nonblock(fderr);
+
 	connection_in = packet_get_connection_in();
 	connection_out = packet_get_connection_out();
 
@@ -426,7 +436,6 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
 
 	/* Main loop of the server for the interactive session mode. */
 	for (;;) {
-		fd_set readset, writeset;
 
 		/* Process buffered packets from the client. */
 		process_buffered_input_packets();
@@ -694,6 +703,9 @@ input_direct_tcpip(void)
 	originator = packet_get_string(NULL);
 	originator_port = packet_get_int();
 	packet_done();
+
+	debug("open direct-tcpip: from %s port %d to %s port %d",
+	   originator, originator_port, target, target_port);
 	/* XXX check permission */
 	sock = channel_connect_to(target, target_port);
 	xfree(target);
@@ -745,7 +757,6 @@ server_input_channel_open(int type, int plen)
 			channel_free(id);
 		}
 	} else if (strcmp(ctype, "direct-tcpip") == 0) {
-		debug("open direct-tcpip");
 		id = input_direct_tcpip();
 		if (id >= 0)
 			c = channel_lookup(id);
diff --git a/crypto/openssh/ssh2.h b/crypto/openssh/ssh2.h
index cf684ba..1fa4c0a 100644
--- a/crypto/openssh/ssh2.h
+++ b/crypto/openssh/ssh2.h
@@ -1,5 +1,5 @@
 /*
- * draft-ietf-secsh-architecture-04.txt
+ * draft-ietf-secsh-architecture-05.txt
  *
  *   Transport layer protocol:
  *
@@ -28,6 +28,7 @@
  *
  *     192-255  Local extensions
  */
+/* RCSID("$OpenBSD: ssh2.h,v 1.3 2000/05/15 07:03:12 markus Exp $"); */
 
 /* transport layer: generic */
 
@@ -88,6 +89,7 @@
 #define SSH2_DISCONNECT_PROTOCOL_ERROR			2
 #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED		3
 #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED	4
+#define SSH2_DISCONNECT_RESERVED			4
 #define SSH2_DISCONNECT_MAC_ERROR			5
 #define SSH2_DISCONNECT_COMPRESSION_ERROR		6
 #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE		7
@@ -95,6 +97,10 @@
 #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE		9
 #define SSH2_DISCONNECT_CONNECTION_LOST			10
 #define SSH2_DISCONNECT_BY_APPLICATION			11
+#define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS		12
+#define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER		13
+#define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE	14
+#define SSH2_DISCONNECT_ILLEGAL_USER_NAME		15
 
 /* misc */
 
diff --git a/crypto/openssh/sshconnect.c b/crypto/openssh/sshconnect.c
index 80beac3..2e54651 100644
--- a/crypto/openssh/sshconnect.c
+++ b/crypto/openssh/sshconnect.c
@@ -8,7 +8,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: sshconnect.c,v 1.72 2000/05/04 09:50:22 markus Exp $");
+RCSID("$OpenBSD: sshconnect.c,v 1.74 2000/05/17 16:57:02 markus Exp $");
 
 #include <openssl/bn.h>
 #include <openssl/dsa.h>
@@ -251,7 +251,7 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
 			temporarily_use_uid(original_real_uid);
 			if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) {
 				/* Successful connection. */
-				memcpy(hostaddr, ai->ai_addr, sizeof(*hostaddr));
+				memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); 
 				restore_uid();
 				break;
 			} else {
@@ -297,21 +297,6 @@ ssh_connect(const char *host, struct sockaddr_storage * hostaddr,
 	return 1;
 }
 
-char *
-chop(char *s)
-{
-	char *t = s;
-	while (*t) {
-		if(*t == '\n' || *t == '\r') {
-			*t = '\0';
-			return s;
-		}
-		t++;
-	}
-	return s;
-
-}
-
 /*
  * Waits for the server identification string, and sends our own
  * identification string.
diff --git a/crypto/openssh/sshconnect2.c b/crypto/openssh/sshconnect2.c
index 99ffb2c..0abcf89 100644
--- a/crypto/openssh/sshconnect2.c
+++ b/crypto/openssh/sshconnect2.c
@@ -28,7 +28,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: sshconnect2.c,v 1.10 2000/05/08 17:42:25 markus Exp $");
+RCSID("$OpenBSD: sshconnect2.c,v 1.11 2000/05/25 20:45:20 markus Exp $");
 
 #include <openssl/bn.h>
 #include <openssl/rsa.h>
@@ -68,16 +68,12 @@ unsigned char *session_id2 = NULL;
 int session_id2_len = 0;
 
 void
-ssh_kex2(char *host, struct sockaddr *hostaddr)
+ssh_kex_dh(Kex *kex, char *host, struct sockaddr *hostaddr,
+    Buffer *client_kexinit, Buffer *server_kexinit)
 {
-	Kex *kex;
-	char *cprop[PROPOSAL_MAX];
-	char *sprop[PROPOSAL_MAX];
-	Buffer *client_kexinit;
-	Buffer *server_kexinit;
-	int payload_len, dlen;
+	int i;
+	int plen, dlen;
 	unsigned int klen, kout;
-	char *ptr;
 	char *signature = NULL;
 	unsigned int slen;
 	char *server_host_key_blob = NULL;
@@ -86,72 +82,10 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
 	DH *dh;
 	BIGNUM *dh_server_pub = 0;
 	BIGNUM *shared_secret = 0;
-	int i;
 	unsigned char *kbuf;
 	unsigned char *hash;
 
-/* KEXINIT */
-
-	debug("Sending KEX init.");
-	if (options.ciphers != NULL) {
-		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
-		myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
-	} else if (options.cipher == SSH_CIPHER_3DES) {
-		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
-		myproposal[PROPOSAL_ENC_ALGS_STOC] =
-		    cipher_name(SSH_CIPHER_3DES_CBC);
-	} else if (options.cipher == SSH_CIPHER_BLOWFISH) {
-		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
-		myproposal[PROPOSAL_ENC_ALGS_STOC] =
-		    cipher_name(SSH_CIPHER_BLOWFISH_CBC);
-	}
-	if (options.compression) {
-		myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
-		myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
-	} else {
-		myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
-		myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
-	}
-	for (i = 0; i < PROPOSAL_MAX; i++)
-		cprop[i] = xstrdup(myproposal[i]);
-
-	client_kexinit = kex_init(cprop);
-	packet_start(SSH2_MSG_KEXINIT);
-	packet_put_raw(buffer_ptr(client_kexinit), buffer_len(client_kexinit));	
-	packet_send();
-	packet_write_wait();
-
-	debug("done");
-
-	packet_read_expect(&payload_len, SSH2_MSG_KEXINIT);
-
-	/* save payload for session_id */
-	server_kexinit = xmalloc(sizeof(*server_kexinit));
-	buffer_init(server_kexinit);
-	ptr = packet_get_raw(&payload_len);
-	buffer_append(server_kexinit, ptr, payload_len);
-
-	/* skip cookie */
-	for (i = 0; i < 16; i++)
-		(void) packet_get_char();
-	/* kex init proposal strings */
-	for (i = 0; i < PROPOSAL_MAX; i++) {
-		sprop[i] = packet_get_string(NULL);
-		debug("got kexinit string: %s", sprop[i]);
-	}
-	i = (int) packet_get_char();
-	debug("first kex follow == %d", i);
-	i = packet_get_int();
-	debug("reserved == %d", i);
-	packet_done();
-
-	debug("done read kexinit");
-	kex = kex_choose_conf(cprop, sprop, 0);
-
-/* KEXDH */
-
 	debug("Sending SSH2_MSG_KEXDH_INIT.");
-
 	/* generate and send 'e', client DH public key */
 	dh = dh_new_group1();
 	packet_start(SSH2_MSG_KEXDH_INIT);
@@ -172,7 +106,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
 
 	debug("Wait SSH2_MSG_KEXDH_REPLY.");
 
-	packet_read_expect(&payload_len, SSH2_MSG_KEXDH_REPLY);
+	packet_read_expect(&plen, SSH2_MSG_KEXDH_REPLY);
 
 	debug("Got SSH2_MSG_KEXDH_REPLY.");
 
@@ -233,10 +167,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
 	    shared_secret
 	);
 	xfree(server_host_key_blob);
-	buffer_free(client_kexinit);
-	buffer_free(server_kexinit);
-	xfree(client_kexinit);
-	xfree(server_kexinit);
+	DH_free(dh);
 #ifdef DEBUG_KEXDH
 	fprintf(stderr, "hash == ");
 	for (i = 0; i< 20; i++)
@@ -250,16 +181,61 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
 	kex_derive_keys(kex, hash, shared_secret);
 	packet_set_kex(kex);
 
-	/* have keys, free DH */
-	DH_free(dh);
-
 	/* save session id */
 	session_id2_len = 20;
 	session_id2 = xmalloc(session_id2_len);
 	memcpy(session_id2, hash, session_id2_len);
+}
+
+void
+ssh_kex2(char *host, struct sockaddr *hostaddr)
+{
+	int i, plen;
+	Kex *kex;
+	Buffer *client_kexinit, *server_kexinit;
+	char *sprop[PROPOSAL_MAX];
+
+	if (options.ciphers != NULL) {
+		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+		myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
+	} else if (options.cipher == SSH_CIPHER_3DES) {
+		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+		myproposal[PROPOSAL_ENC_ALGS_STOC] =
+		    (char *) cipher_name(SSH_CIPHER_3DES_CBC);
+	} else if (options.cipher == SSH_CIPHER_BLOWFISH) {
+		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+		myproposal[PROPOSAL_ENC_ALGS_STOC] =
+		    (char *) cipher_name(SSH_CIPHER_BLOWFISH_CBC);
+	}
+	if (options.compression) {
+		myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib";
+		myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib";
+	} else {
+		myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none";
+		myproposal[PROPOSAL_COMP_ALGS_STOC] = "none";
+	}
+
+	/* buffers with raw kexinit messages */
+	server_kexinit = xmalloc(sizeof(*server_kexinit));
+	buffer_init(server_kexinit);
+	client_kexinit = kex_init(myproposal);
+
+	/* algorithm negotiation */
+	kex_exchange_kexinit(client_kexinit, server_kexinit, sprop);
+	kex = kex_choose_conf(myproposal, sprop, 0);
+	for (i = 0; i < PROPOSAL_MAX; i++)
+		xfree(sprop[i]);
+
+	/* server authentication and session key agreement */
+	ssh_kex_dh(kex, host, hostaddr, client_kexinit, server_kexinit);
+
+	buffer_free(client_kexinit);
+	buffer_free(server_kexinit);
+	xfree(client_kexinit);
+	xfree(server_kexinit);
 
 	debug("Wait SSH2_MSG_NEWKEYS.");
-	packet_read_expect(&payload_len, SSH2_MSG_NEWKEYS);
+	packet_read_expect(&plen, SSH2_MSG_NEWKEYS);
 	packet_done();
 	debug("GOT SSH2_MSG_NEWKEYS.");
 
@@ -278,6 +254,7 @@ ssh_kex2(char *host, struct sockaddr *hostaddr)
 #endif
 	debug("done: KEX2.");
 }
+
 /*
  * Authenticate user
  */
diff --git a/crypto/openssh/sshd.c b/crypto/openssh/sshd.c
index 0d62320..4a1a47f 100644
--- a/crypto/openssh/sshd.c
+++ b/crypto/openssh/sshd.c
@@ -14,7 +14,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: sshd.c,v 1.115 2000/05/03 10:21:49 markus Exp $");
+RCSID("$OpenBSD: sshd.c,v 1.118 2000/05/25 20:45:20 markus Exp $");
 
 #include "xmalloc.h"
 #include "rsa.h"
@@ -258,21 +258,6 @@ key_regeneration_alarm(int sig)
 	errno = save_errno;
 }
 
-char *
-chop(char *s)
-{
-	char *t = s;
-	while (*t) {
-		if(*t == '\n' || *t == '\r') {
-			*t = '\0';
-			return s;
-		}
-		t++;
-	}
-	return s;
-
-}
-
 void
 sshd_exchange_identification(int sock_in, int sock_out)
 {
@@ -400,9 +385,12 @@ void
 destroy_sensitive_data(void)
 {
 	/* Destroy the private and public keys.  They will no longer be needed. */
-	RSA_free(public_key);
-	RSA_free(sensitive_data.private_key);
-	RSA_free(sensitive_data.host_key);
+	if (public_key)
+		RSA_free(public_key);
+	if (sensitive_data.private_key)
+		RSA_free(sensitive_data.private_key);
+	if (sensitive_data.host_key)
+		RSA_free(sensitive_data.host_key);
 	if (sensitive_data.dsa_host_key != NULL)
 		key_free(sensitive_data.dsa_host_key);
 }
@@ -1161,7 +1149,6 @@ do_ssh2_kex()
 	int payload_len, dlen;
 	int slen;
 	unsigned int klen, kout;
-	char *ptr;
 	unsigned char *signature = NULL;
 	unsigned char *server_host_key_blob = NULL;
 	unsigned int sbloblen;
@@ -1173,7 +1160,6 @@ do_ssh2_kex()
 	unsigned char *hash;
 	Kex *kex;
 	char *cprop[PROPOSAL_MAX];
-	char *sprop[PROPOSAL_MAX];
 
 /* KEXINIT */
 
@@ -1181,46 +1167,15 @@ do_ssh2_kex()
 		myproposal[PROPOSAL_ENC_ALGS_CTOS] =
 		myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
 	}
-
-	debug("Sending KEX init.");
-
-	for (i = 0; i < PROPOSAL_MAX; i++)
-		sprop[i] = xstrdup(myproposal[i]);
-	server_kexinit = kex_init(sprop);
-	packet_start(SSH2_MSG_KEXINIT);
-	packet_put_raw(buffer_ptr(server_kexinit), buffer_len(server_kexinit));	
-	packet_send();
-	packet_write_wait();
-
-	debug("done");
-
-	packet_read_expect(&payload_len, SSH2_MSG_KEXINIT);
-
-	/*
-	 * save raw KEXINIT payload in buffer. this is used during
-	 * computation of the session_id and the session keys.
-	 */
+	server_kexinit = kex_init(myproposal);
 	client_kexinit = xmalloc(sizeof(*client_kexinit));
 	buffer_init(client_kexinit);
-	ptr = packet_get_raw(&payload_len);
-	buffer_append(client_kexinit, ptr, payload_len);
 
-	/* skip cookie */
-	for (i = 0; i < 16; i++)
-		(void) packet_get_char();
-	/* save kex init proposal strings */
-	for (i = 0; i < PROPOSAL_MAX; i++) {
-		cprop[i] = packet_get_string(NULL);
-		debug("got kexinit string: %s", cprop[i]);
-	}
-
-	i = (int) packet_get_char();
-	debug("first kex follow == %d", i);
-	i = packet_get_int();
-	debug("reserved == %d", i);
-
-	debug("done read kexinit");
-	kex = kex_choose_conf(cprop, sprop, 1);
+	/* algorithm negotiation */
+	kex_exchange_kexinit(server_kexinit, client_kexinit, cprop);
+	kex = kex_choose_conf(cprop, myproposal, 1);
+	for (i = 0; i < PROPOSAL_MAX; i++)
+		xfree(cprop[i]);
 
 /* KEXDH */