From 755a16fa864cacbbd9fbefc822011b6741351d8d Mon Sep 17 00:00:00 2001
From: des <des@FreeBSD.org>
Date: Sat, 3 Sep 2005 06:59:33 +0000
Subject: Vendor import of OpenSSH 4.2p1.

---
 crypto/openssh/packet.c | 63 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 5 deletions(-)

(limited to 'crypto/openssh/packet.c')

diff --git a/crypto/openssh/packet.c b/crypto/openssh/packet.c
index 7c150fd..70e0110 100644
--- a/crypto/openssh/packet.c
+++ b/crypto/openssh/packet.c
@@ -37,7 +37,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: packet.c,v 1.116 2004/10/20 11:48:53 markus Exp $");
+RCSID("$OpenBSD: packet.c,v 1.119 2005/07/28 17:36:22 markus Exp $");
 
 #include "openbsd-compat/sys-queue.h"
 
@@ -116,6 +116,12 @@ static int initialized = 0;
 /* Set to true if the connection is interactive. */
 static int interactive_mode = 0;
 
+/* Set to true if we are the server side. */
+static int server_side = 0;
+
+/* Set to true if we are authenticated. */
+static int after_authentication = 0;
+
 /* Session key information for Encryption and MAC */
 Newkeys *newkeys[MODE_MAX];
 static struct packet_state {
@@ -624,7 +630,9 @@ set_newkeys(int mode)
 	/* Deleting the keys does not gain extra security */
 	/* memset(enc->iv,  0, enc->block_size);
 	   memset(enc->key, 0, enc->key_len); */
-	if (comp->type != 0 && comp->enabled == 0) {
+	if ((comp->type == COMP_ZLIB ||
+	    (comp->type == COMP_DELAYED && after_authentication)) &&
+	    comp->enabled == 0) {
 		packet_init_compression();
 		if (mode == MODE_OUT)
 			buffer_compress_init_send(6);
@@ -645,6 +653,35 @@ set_newkeys(int mode)
 }
 
 /*
+ * Delayed compression for SSH2 is enabled after authentication:
+ * This happans on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
+ * and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
+ */
+static void
+packet_enable_delayed_compress(void)
+{
+	Comp *comp = NULL;
+	int mode;
+
+	/*
+	 * Remember that we are past the authentication step, so rekeying
+	 * with COMP_DELAYED will turn on compression immediately.
+	 */
+	after_authentication = 1;
+	for (mode = 0; mode < MODE_MAX; mode++) {
+		comp = &newkeys[mode]->comp;
+		if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
+			packet_init_compression();
+			if (mode == MODE_OUT)
+				buffer_compress_init_send(6);
+			else
+				buffer_compress_init_recv();
+			comp->enabled = 1;
+		}
+	}
+}
+
+/*
  * Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
  */
 static void
@@ -757,6 +794,8 @@ packet_send2_wrapped(void)
 
 	if (type == SSH2_MSG_NEWKEYS)
 		set_newkeys(MODE_OUT);
+	else if (type == SSH2_MSG_USERAUTH_SUCCESS && server_side)
+		packet_enable_delayed_compress();
 }
 
 static void
@@ -992,7 +1031,7 @@ packet_read_poll2(u_int32_t *seqnr_p)
 	static u_int packet_length = 0;
 	u_int padlen, need;
 	u_char *macbuf, *cp, type;
-	int maclen, block_size;
+	u_int maclen, block_size;
 	Enc *enc   = NULL;
 	Mac *mac   = NULL;
 	Comp *comp = NULL;
@@ -1099,6 +1138,8 @@ packet_read_poll2(u_int32_t *seqnr_p)
 		packet_disconnect("Invalid ssh2 packet type: %d", type);
 	if (type == SSH2_MSG_NEWKEYS)
 		set_newkeys(MODE_IN);
+	else if (type == SSH2_MSG_USERAUTH_SUCCESS && !server_side)
+		packet_enable_delayed_compress();
 #ifdef PACKET_DEBUG
 	fprintf(stderr, "read/plain[%d]:\r\n", type);
 	buffer_dump(&incoming_packet);
@@ -1229,9 +1270,9 @@ packet_get_bignum2(BIGNUM * value)
 }
 
 void *
-packet_get_raw(int *length_ptr)
+packet_get_raw(u_int *length_ptr)
 {
-	int bytes = buffer_len(&incoming_packet);
+	u_int bytes = buffer_len(&incoming_packet);
 
 	if (length_ptr != NULL)
 		*length_ptr = bytes;
@@ -1524,3 +1565,15 @@ packet_set_rekey_limit(u_int32_t bytes)
 {
 	rekey_limit = bytes;
 }
+
+void
+packet_set_server(void)
+{
+	server_side = 1;
+}
+
+void
+packet_set_authenticated(void)
+{
+	after_authentication = 1;
+}
-- 
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