forgot -kb

1 files changed, 0 insertions, 430 deletions

diff --git a/kex.c b/kex.c
deleted file mode 100644
index 4b526693..00000000
--- a/kex.c
+++ /dev/null
@@ -1,430 +0,0 @@
-/*
- * Copyright (c) 2000 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.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by Markus Friedl.
- * 4. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * 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"
-RCSID("$Id: kex.c,v 1.5 2000/04/16 01:18:43 damien Exp $");
-
-#include "ssh.h"
-#include "ssh2.h"
-#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
-#include "cipher.h"
-#include "compat.h"
-
-#if HAVE_OPENSSL
-# include <openssl/bn.h>
-# include <openssl/dh.h>
-# include <openssl/crypto.h>
-# include <openssl/bio.h>
-# include <openssl/pem.h>
-#endif /* HAVE_OPENSSL */
-#if HAVE_SSL
-# include <ssl/bn.h>
-# include <ssl/dh.h>
-# include <ssl/crypto.h>
-# include <ssl/bio.h>
-# include <ssl/pem.h>
-#endif /* HAVE_SSL */
-
-#include "kex.h"
-
-Buffer *
-kex_init(char *myproposal[PROPOSAL_MAX])
-{
-	char c = 0;
-	unsigned char cookie[16];
-	u_int32_t rand = 0;
-	int i;
-	Buffer *ki = xmalloc(sizeof(*ki));
-	for (i = 0; i < 16; i++) {
-		if (i % 4 == 0)
-			rand = arc4random();
-		cookie[i] = rand & 0xff;
-		rand >>= 8;
-	}
-	buffer_init(ki);
-	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) */
-	return ki;
-}
-
-/* diffie-hellman-group1-sha1 */
-
-int
-dh_pub_is_valid(DH *dh, BIGNUM *dh_pub)
-{
-	int i;
-	int n = BN_num_bits(dh_pub);
-	int bits_set = 0;
-
-	/* we only accept g==2 */
-	if (!BN_is_word(dh->g, 2)) {
-		log("invalid DH base != 2");
-		return 0;
-	}
-	if (dh_pub->neg) {
-		log("invalid public DH value: negativ");
-		return 0;
-	}
-	for (i = 0; i <= n; i++)
-		if (BN_is_bit_set(dh_pub, i))
-			bits_set++;
-	debug("bits set: %d/%d", bits_set, BN_num_bits(dh->p));
-
-	/* if g==2 and bits_set==1 then computing log_g(dh_pub) is trivial */
-	if (bits_set > 1 && (BN_cmp(dh_pub, dh->p) == -1))
-		return 1;
-	log("invalid public DH value (%d/%d)", bits_set, BN_num_bits(dh->p));
-	return 0;
-}
-
-DH *
-dh_new_group1()
-{
-	static char *group1 =
-	    "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
-	    "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
-	    "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
-	    "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
-	    "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381"
-	    "FFFFFFFF" "FFFFFFFF";
-	DH *dh;
-	int ret, tries = 0;
-	dh = DH_new();
-	if(dh == NULL)
-		fatal("DH_new");
-	ret = BN_hex2bn(&dh->p, group1);
-	if(ret<0)
-		fatal("BN_hex2bn");
-	dh->g = BN_new();
-	if(dh->g == NULL)
-		fatal("DH_new g");
-	BN_set_word(dh->g, 2);
-	do {
-		if (DH_generate_key(dh) == 0)
-			fatal("DH_generate_key");
-		if (tries++ > 10)
-			fatal("dh_new_group1: too many bad keys: giving up");
-	} while (!dh_pub_is_valid(dh, dh->pub_key));
-	return dh;
-}
-
-void
-bignum_print(BIGNUM *b)
-{
-	BN_print_fp(stderr,b);
-}
-
-void
-dump_digest(unsigned char *digest, int len)
-{
-	int i;
-	for (i = 0; i< len; i++){
-		fprintf(stderr, "%02x", digest[i]);
-		if(i%2!=0)
-			fprintf(stderr, " ");
-	}
-	fprintf(stderr, "\n");
-}
-
-unsigned char *
-kex_hash(
-    char *client_version_string,
-    char *server_version_string,
-    char *ckexinit, int ckexinitlen,
-    char *skexinit, int skexinitlen,
-    char *serverhostkeyblob, int sbloblen,
-    BIGNUM *client_dh_pub,
-    BIGNUM *server_dh_pub,
-    BIGNUM *shared_secret)
-{
-	Buffer b;
-	static unsigned char digest[EVP_MAX_MD_SIZE];
-	EVP_MD *evp_md = EVP_sha1();
-	EVP_MD_CTX md;
-
-	buffer_init(&b);
-	buffer_put_string(&b, client_version_string, strlen(client_version_string));
-	buffer_put_string(&b, server_version_string, strlen(server_version_string));
-
-	/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
-	buffer_put_int(&b, ckexinitlen+1);
-	buffer_put_char(&b, SSH2_MSG_KEXINIT);
-	buffer_append(&b, ckexinit, ckexinitlen);
-	buffer_put_int(&b, skexinitlen+1);
-	buffer_put_char(&b, SSH2_MSG_KEXINIT);
-	buffer_append(&b, skexinit, skexinitlen);
-
-	buffer_put_string(&b, serverhostkeyblob, sbloblen);
-	buffer_put_bignum2(&b, client_dh_pub);
-	buffer_put_bignum2(&b, server_dh_pub);
-	buffer_put_bignum2(&b, shared_secret);
-	
-#ifdef DEBUG_KEX
-	buffer_dump(&b);
-#endif
-
-	EVP_DigestInit(&md, evp_md);
-	EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
-	EVP_DigestFinal(&md, digest, NULL);
-
-	buffer_free(&b);
-
-#ifdef DEBUG_KEX
-	dump_digest(digest, evp_md->md_size);
-#endif
-	return digest;
-}
-
-unsigned char *
-derive_key(int id, int need, char unsigned *hash, BIGNUM *shared_secret)
-{
-	Buffer b;
-	EVP_MD *evp_md = EVP_sha1();
-	EVP_MD_CTX md;
-	char c = id;
-	int have;
-	int mdsz = evp_md->md_size;
-	unsigned char *digest = xmalloc(((need+mdsz-1)/mdsz)*mdsz);
-
-	buffer_init(&b);
-	buffer_put_bignum2(&b, shared_secret);
-
-	EVP_DigestInit(&md, evp_md);
-	EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));	/* shared_secret K */
-	EVP_DigestUpdate(&md, hash, mdsz);		/* transport-06 */
-	EVP_DigestUpdate(&md, &c, 1);			/* key id */
-	EVP_DigestUpdate(&md, hash, mdsz);		/* session id */
-	EVP_DigestFinal(&md, digest, NULL);
-
-	/* expand */
-	for (have = mdsz; need > have; have += mdsz) {
-		EVP_DigestInit(&md, evp_md);
-		EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
-		EVP_DigestUpdate(&md, hash, mdsz);
-		EVP_DigestUpdate(&md, digest, have);
-		EVP_DigestFinal(&md, digest + have, NULL);
-	}
-	buffer_free(&b);
-#ifdef DEBUG_KEX
-	fprintf(stderr, "Digest '%c'== ", c);
-	dump_digest(digest, need);
-#endif
-	return digest;
-}
-
-#define NKEYS	6
-
-#define	MAX_PROP	20
-#define	SEP	","
-
-char *
-get_match(char *client, char *server)
-{
-	char *sproposals[MAX_PROP];
-	char *p;
-	int i, j, nproposals;
-
-	for ((p = strtok(server, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) {
-		if (i < MAX_PROP)
-			sproposals[i] = p;
-		else
-			break;
-	}
-	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);
-	}
-	return NULL;
-}
-void
-choose_enc(Enc *enc, char *client, char *server)
-{
-	char *name = get_match(client, server);
-	if (name == NULL)
-		fatal("no matching cipher found: client %s server %s", client, server);
-	enc->type = cipher_number(name);
-
-	switch (enc->type) {
-	case SSH_CIPHER_3DES_CBC:
-		enc->key_len = 24;
-		enc->iv_len = 8;
-		enc->block_size = 8;
-		break;
-	case SSH_CIPHER_BLOWFISH_CBC:
-	case SSH_CIPHER_CAST128_CBC:
-		enc->key_len = 16;
-		enc->iv_len = 8;
-		enc->block_size = 8;
-		break;
-	case SSH_CIPHER_ARCFOUR:
-		enc->key_len = 16;
-		enc->iv_len = 0;
-		enc->block_size = 8;
-		break;
-	default:
-		fatal("unsupported cipher %s", name);
-	}
-	enc->name = name;
-	enc->enabled = 0;
-	enc->iv = NULL;
-	enc->key = NULL;
-}
-void
-choose_mac(Mac *mac, char *client, char *server)
-{
-	char *name = get_match(client, server);
-	if (name == NULL)
-		fatal("no matching mac found: client %s server %s", client, server);
-	if (strcmp(name, "hmac-md5") == 0) {
-		mac->md = EVP_md5();
-	} else if (strcmp(name, "hmac-sha1") == 0) {
-		mac->md = EVP_sha1();
-	} else if (strcmp(name, "hmac-ripemd160@openssh.com") == 0) {
-		mac->md = EVP_ripemd160();
-	} else {
-		fatal("unsupported mac %s", name);
-	}
-	mac->name = name;
-	mac->mac_len = mac->md->md_size;
-	mac->key_len = datafellows ? 16 : mac->mac_len;
-	mac->key = NULL;
-	mac->enabled = 0;
-}
-void
-choose_comp(Comp *comp, char *client, char *server)
-{
-	char *name = get_match(client, server);
-	if (name == NULL)
-		fatal("no matching comp found: client %s server %s", client, server);
-	if (strcmp(name, "zlib") == 0) {
-		comp->type = 1;
-	} else if (strcmp(name, "none") == 0) {
-		comp->type = 0;
-	} else {
-		fatal("unsupported comp %s", name);
-	}
-	comp->name = name;
-}
-void
-choose_kex(Kex *k, char *client, char *server)
-{
-	k->name = get_match(client, server);
-	if (k->name == NULL)
-		fatal("no kex alg");
-	if (strcmp(k->name, KEX_DH1) != 0)
-		fatal("bad kex alg %s", k->name);
-}
-void
-choose_hostkeyalg(Kex *k, char *client, char *server)
-{
-	k->hostkeyalg = get_match(client, server);
-	if (k->hostkeyalg == NULL)
-		fatal("no hostkey alg");
-	if (strcmp(k->hostkeyalg, KEX_DSS) != 0)
-		fatal("bad hostkey alg %s", k->hostkeyalg);
-}
-
-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;
-	Kex *k;
-
-	k = xmalloc(sizeof(*k));
-	memset(k, 0, sizeof(*k));
-	k->server = server;
-
-	for (mode = 0; mode < MODE_MAX; mode++) {
-		int nenc, nmac, ncomp;
-		ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN);
-		nenc  = ctos ? PROPOSAL_ENC_ALGS_CTOS  : PROPOSAL_ENC_ALGS_STOC;
-		nmac  = ctos ? PROPOSAL_MAC_ALGS_CTOS  : PROPOSAL_MAC_ALGS_STOC;
-		ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC;
-		choose_enc (&k->enc [mode], cprop[nenc],  sprop[nenc]);
-		choose_mac (&k->mac [mode], cprop[nmac],  sprop[nmac]);
-		choose_comp(&k->comp[mode], cprop[ncomp], sprop[ncomp]);
-		debug("kex: %s %s %s %s",
-		    ctos ? "client->server" : "server->client",
-		    k->enc[mode].name,
-		    k->mac[mode].name,
-		    k->comp[mode].name);
-	}
-	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)
-		    need = k->enc[mode].key_len;
-	    if (need < k->enc[mode].iv_len)
-		    need = k->enc[mode].iv_len;
-	    if (need < k->mac[mode].key_len)
-		    need = k->mac[mode].key_len;
-	}
-	/* need runden? */
-#define WE_NEED 32
-	k->we_need = WE_NEED;
-	k->we_need = need;
-	return k;
-}
-
-int
-kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret)
-{
-	int i;
-	int mode;
-	int ctos;
-	unsigned char *keys[NKEYS];
-
-	for (i = 0; i < NKEYS; i++)
-		keys[i] = derive_key('A'+i, k->we_need, hash, shared_secret);
-
-	for (mode = 0; mode < MODE_MAX; mode++) {
-		ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN);
-		k->enc[mode].iv  = keys[ctos ? 0 : 1];
-		k->enc[mode].key = keys[ctos ? 2 : 3];
-		k->mac[mode].key = keys[ctos ? 4 : 5];
-	}
-	return 0;
-}