summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDamien Miller <djm@mindrot.org>2000-04-16 11:49:14 +1000
committerDamien Miller <djm@mindrot.org>2000-04-16 11:49:14 +1000
commitd8495e7d61c72093d81e9b2dba2a5acc440c3787 (patch)
treea6a4778dadf85a334c13efa2deaed5242d1563cd
parent4af51306d9a51459a5bef922df1037f876ae51fe (diff)
forgot -kb
-rw-r--r--dsa.c310
-rw-r--r--hmac.c64
-rw-r--r--kex.c430
3 files changed, 0 insertions, 804 deletions
diff --git a/dsa.c b/dsa.c
deleted file mode 100644
index 778d43d5..00000000
--- a/dsa.c
+++ /dev/null
@@ -1,310 +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: dsa.c,v 1.4 2000/04/14 10:30:31 markus Exp $");
-
-#include "ssh.h"
-#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
-#include "compat.h"
-
-#if HAVE_OPENSSL
-# include <openssl/bn.h>
-# include <openssl/dh.h>
-# include <openssl/rsa.h>
-# include <openssl/dsa.h>
-# include <openssl/evp.h>
-# include <openssl/bio.h>
-# include <openssl/pem.h>
-# include <openssl/hmac.h>
-#endif /* HAVE_OPENSSL */
-#if HAVE_SSL
-# include <ssl/bn.h>
-# include <ssl/dh.h>
-# include <ssl/rsa.h>
-# include <ssl/dsa.h>
-# include <ssl/evp.h>
-# include <ssl/bio.h>
-# include <ssl/pem.h>
-# include <ssl/hmac.h>
-#endif /* HAVE_SSL */
-
-#include "kex.h"
-#include "key.h"
-
-#define INTBLOB_LEN 20
-#define SIGBLOB_LEN (2*INTBLOB_LEN)
-
-Key *
-dsa_serverkey_from_blob(
- char *serverhostkey, int serverhostkeylen)
-{
- Buffer b;
- char *ktype;
- int rlen;
- DSA *dsa;
- Key *key;
-
- /* fetch & parse DSA/DSS pubkey */
- key = key_new(KEY_DSA);
- dsa = key->dsa;
- buffer_init(&b);
- buffer_append(&b, serverhostkey, serverhostkeylen);
- ktype = buffer_get_string(&b, NULL);
- if (strcmp(KEX_DSS, ktype) != 0) {
- error("dsa_serverkey_from_blob: cannot handle type %s", ktype);
- key_free(key);
- return NULL;
- }
- buffer_get_bignum2(&b, dsa->p);
- buffer_get_bignum2(&b, dsa->q);
- buffer_get_bignum2(&b, dsa->g);
- buffer_get_bignum2(&b, dsa->pub_key);
- rlen = buffer_len(&b);
- if(rlen != 0)
- error("dsa_serverkey_from_blob: remaining bytes in serverhostkey %d", rlen);
- buffer_free(&b);
-
- debug("keytype %s", ktype);
-#ifdef DEBUG_DSS
- DSA_print_fp(stderr, dsa, 8);
-#endif
- return key;
-}
-DSA *
-dsa_load_private(char *filename)
-{
- DSA *dsa;
- BIO *in;
-
- in = BIO_new(BIO_s_file());
- if (in == NULL)
- fatal("BIO_new failed");
- if (BIO_read_filename(in, filename) <= 0)
- fatal("BIO_read failed %s: %s", filename, strerror(errno));
- fprintf(stderr, "read DSA private key\n");
- dsa = PEM_read_bio_DSAPrivateKey(in,NULL,NULL,NULL);
- if (dsa == NULL)
- fatal("PEM_read_bio_DSAPrivateKey failed %s", filename);
- BIO_free(in);
- return dsa;
-}
-Key *
-dsa_get_serverkey(char *filename)
-{
- Key *k = key_new(KEY_EMPTY);
- k->type = KEY_DSA;
- k->dsa = dsa_load_private(filename);
-#ifdef DEBUG_DSS
- DSA_print_fp(stderr, dsa, 8);
-#endif
- return k;
-}
-int
-dsa_make_serverkey_blob(Key *key, unsigned char **blobp, unsigned int *lenp)
-{
- Buffer b;
- int len;
- unsigned char *buf;
-
- if (key == NULL || key->type != KEY_DSA)
- return 0;
- buffer_init(&b);
- buffer_put_cstring(&b, KEX_DSS);
- buffer_put_bignum2(&b, key->dsa->p);
- buffer_put_bignum2(&b, key->dsa->q);
- buffer_put_bignum2(&b, key->dsa->g);
- buffer_put_bignum2(&b, key->dsa->pub_key);
- len = buffer_len(&b);
- buf = xmalloc(len);
- memcpy(buf, buffer_ptr(&b), len);
- memset(buffer_ptr(&b), 0, len);
- buffer_free(&b);
- if (lenp != NULL)
- *lenp = len;
- if (blobp != NULL)
- *blobp = buf;
- return len;
-}
-int
-dsa_sign(
- Key *key,
- unsigned char **sigp, int *lenp,
- unsigned char *hash, int hlen)
-{
- unsigned char *digest;
- unsigned char *ret;
- DSA_SIG *sig;
- EVP_MD *evp_md = EVP_sha1();
- EVP_MD_CTX md;
- unsigned int rlen;
- unsigned int slen;
- unsigned int len;
- unsigned char sigblob[SIGBLOB_LEN];
- Buffer b;
-
- if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) {
- error("dsa_sign: no DSA key");
- return -1;
- }
- digest = xmalloc(evp_md->md_size);
- EVP_DigestInit(&md, evp_md);
- EVP_DigestUpdate(&md, hash, hlen);
- EVP_DigestFinal(&md, digest, NULL);
-
- sig = DSA_do_sign(digest, evp_md->md_size, key->dsa);
-
- rlen = BN_num_bytes(sig->r);
- slen = BN_num_bytes(sig->s);
- if (rlen > INTBLOB_LEN || slen > INTBLOB_LEN) {
- error("bad sig size %d %d", rlen, slen);
- DSA_SIG_free(sig);
- return -1;
- }
- debug("sig size %d %d", rlen, slen);
-
- memset(sigblob, 0, SIGBLOB_LEN);
- BN_bn2bin(sig->r, sigblob+ SIGBLOB_LEN - INTBLOB_LEN - rlen);
- BN_bn2bin(sig->s, sigblob+ SIGBLOB_LEN - slen);
- DSA_SIG_free(sig);
-
- if (datafellows) {
- debug("datafellows");
- ret = xmalloc(SIGBLOB_LEN);
- memcpy(ret, sigblob, SIGBLOB_LEN);
- if (lenp != NULL)
- *lenp = SIGBLOB_LEN;
- if (sigp != NULL)
- *sigp = ret;
- } else {
- /* ietf-drafts */
- buffer_init(&b);
- buffer_put_cstring(&b, KEX_DSS);
- buffer_put_string(&b, sigblob, SIGBLOB_LEN);
- len = buffer_len(&b);
- ret = xmalloc(len);
- memcpy(ret, buffer_ptr(&b), len);
- buffer_free(&b);
- if (lenp != NULL)
- *lenp = len;
- if (sigp != NULL)
- *sigp = ret;
- }
- return 0;
-}
-int
-dsa_verify(
- Key *key,
- unsigned char *signature, int signaturelen,
- unsigned char *hash, int hlen)
-{
- Buffer b;
- unsigned char *digest;
- DSA_SIG *sig;
- EVP_MD *evp_md = EVP_sha1();
- EVP_MD_CTX md;
- char *ktype;
- unsigned char *sigblob;
- char *txt;
- unsigned int len;
- int rlen;
- int ret;
-
- if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) {
- error("dsa_verify: no DSA key");
- return -1;
- }
-
- if (datafellows && signaturelen != SIGBLOB_LEN) {
- log("heh? datafellows ssh2 complies with ietf-drafts????");
- datafellows = 0;
- }
-
- debug("len %d datafellows %d", signaturelen, datafellows);
-
- /* fetch signature */
- if (datafellows) {
- sigblob = signature;
- len = signaturelen;
- } else {
- /* ietf-drafts */
- buffer_init(&b);
- buffer_append(&b, (char *) signature, signaturelen);
- ktype = buffer_get_string(&b, NULL);
- sigblob = (unsigned char *)buffer_get_string(&b, &len);
- rlen = buffer_len(&b);
- if(rlen != 0)
- error("remaining bytes in signature %d", rlen);
- buffer_free(&b);
- }
-
- if (len != SIGBLOB_LEN) {
- fatal("bad sigbloblen %d != SIGBLOB_LEN", len);
- }
-
- /* parse signature */
- sig = DSA_SIG_new();
- sig->r = BN_new();
- sig->s = BN_new();
- BN_bin2bn(sigblob, INTBLOB_LEN, sig->r);
- BN_bin2bn(sigblob+ INTBLOB_LEN, INTBLOB_LEN, sig->s);
- if (!datafellows) {
- memset(sigblob, 0, len);
- xfree(sigblob);
- }
-
- /* sha1 the signed data (== session_id == hash) */
- digest = xmalloc(evp_md->md_size);
- EVP_DigestInit(&md, evp_md);
- EVP_DigestUpdate(&md, hash, hlen);
- EVP_DigestFinal(&md, digest, NULL);
-
- ret = DSA_do_verify(digest, evp_md->md_size, sig, key->dsa);
-
- memset(digest, 0, evp_md->md_size);
- xfree(digest);
- DSA_SIG_free(sig);
-
- switch (ret) {
- case 1:
- txt = "correct";
- break;
- case 0:
- txt = "incorrect";
- break;
- case -1:
- default:
- txt = "error";
- break;
- }
- debug("dsa_verify: signature %s", txt);
- return ret;
-}
diff --git a/hmac.c b/hmac.c
deleted file mode 100644
index eea1a260..00000000
--- a/hmac.c
+++ /dev/null
@@ -1,64 +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: hmac.c,v 1.2 2000/04/12 09:39:10 markus Exp $");
-
-#include "xmalloc.h"
-#include "ssh.h"
-#include "getput.h"
-
-#if HAVE_OPENSSL
-# include <openssl/hmac.h>
-#endif /* HAVE_OPENSSL */
-#if HAVE_SSL
-# include <ssl/hmac.h>
-#endif /* HAVE_SSL */
-
-unsigned char *
-hmac(
- EVP_MD *evp_md,
- unsigned int seqno,
- unsigned char *data, int datalen,
- unsigned char *key, int keylen)
-{
- HMAC_CTX c;
- static unsigned char m[EVP_MAX_MD_SIZE];
- unsigned char b[4];
-
- if (key == NULL)
- fatal("hmac: no key");
- HMAC_Init(&c, key, keylen, evp_md);
- PUT_32BIT(b, seqno);
- HMAC_Update(&c, b, sizeof b);
- HMAC_Update(&c, data, datalen);
- HMAC_Final(&c, m, NULL);
- HMAC_cleanup(&c);
- return(m);
-}
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;
-}