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dh: Add support for diffie-hellman-group14-sha1.

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This commit is contained in:
Dmitriy Kuznetsov
2012-09-04 16:16:15 +02:00
committed by Andreas Schneider
parent 977951e96a
commit e689375e45
7 changed files with 92 additions and 22 deletions
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2
include/libssh/crypto.h
View File

@@ -49,6 +49,8 @@
enum ssh_key_exchange_e {
/* diffie-hellman-group1-sha1 */
SSH_KEX_DH_GROUP1_SHA1=1,
/* diffie-hellman-group14-sha1 */
SSH_KEX_DH_GROUP14_SHA1,
/* ecdh-sha2-nistp256 */
SSH_KEX_ECDH_SHA2_NISTP256
};

1
src/client.c
View File

@@ -194,6 +194,7 @@ static int dh_handshake(ssh_session session) {
case DH_STATE_INIT:
switch(session->next_crypto->kex_type){
case SSH_KEX_DH_GROUP1_SHA1:
case SSH_KEX_DH_GROUP14_SHA1:
rc = ssh_client_dh_init(session);
break;
#ifdef HAVE_ECDH

101
src/dh.c
View File

@@ -5,6 +5,7 @@
*
* Copyright (c) 2003-2008 by Aris Adamantiadis
* Copyright (c) 2009 by Andreas Schneider <mail@cynapses.org>
* Copyright (c) 2012 by Dmitriy Kuznetsov <dk@yandex.ru>
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
@@ -67,7 +68,7 @@
#include <openssl/err.h>
#endif
static unsigned char p_value[] = {
static unsigned char p_group1_value[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
@@ -79,13 +80,45 @@ static unsigned char p_value[] = {
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
#define P_LEN 128 /* Size in bytes of the p number */
#define P_GROUP1_LEN 128 /* Size in bytes of the p number */
static unsigned char p_group14_value[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36,
0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56,
0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2,
0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C,
0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF};
#define P_GROUP14_LEN 256 /* Size in bytes of the p number for group 14 */
static unsigned long g_int = 2 ; /* G is defined as 2 by the ssh2 standards */
static bignum g;
static bignum p;
static bignum p_group1;
static bignum p_group14;
static int ssh_crypto_initialized;
static bignum select_p(enum ssh_key_exchange_e type) {
return type == SSH_KEX_DH_GROUP14_SHA1 ? p_group14 : p_group1;
}
int ssh_get_random(void *where, int len, int strong){
#ifdef HAVE_LIBGCRYPT
@@ -107,6 +140,7 @@ int ssh_get_random(void *where, int len, int strong){
return 1;
}
/*
* This inits the values g and p which are used for DH key agreement
* FIXME: Make the function thread safe by adding a semaphore or mutex.
@@ -128,20 +162,40 @@ int ssh_crypto_init(void) {
bignum_set_word(g,g_int);
#ifdef HAVE_LIBGCRYPT
bignum_bin2bn(p_value, P_LEN, &p);
if (p == NULL) {
bignum_bin2bn(p_group1_value, P_GROUP1_LEN, &p_group1);
if (p_group1 == NULL) {
bignum_free(g);
g = NULL;
return -1;
}
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, &p_group14);
if (p_group1 == NULL) {
bignum_free(g);
bignum_free(p_group1);
g = NULL;
p_group1 = NULL;
return -1;
}
#elif defined HAVE_LIBCRYPTO
p = bignum_new();
if (p == NULL) {
p_group1 = bignum_new();
if (p_group1 == NULL) {
bignum_free(g);
g = NULL;
return -1;
}
bignum_bin2bn(p_value, P_LEN, p);
bignum_bin2bn(p_group1_value, P_GROUP1_LEN, p_group1);
p_group14 = bignum_new();
if (p_group14 == NULL) {
bignum_free(g);
bignum_free(p_group1);
g = NULL;
p_group1 = NULL;
return -1;
}
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, p_group14);
OpenSSL_add_all_algorithms();
#endif
@@ -156,8 +210,10 @@ void ssh_crypto_finalize(void) {
if (ssh_crypto_initialized) {
bignum_free(g);
g = NULL;
bignum_free(p);
p = NULL;
bignum_free(p_group1);
p_group1 = NULL;
bignum_free(p_group14);
p_group14 = NULL;
#ifdef HAVE_LIBGCRYPT
gcry_control(GCRYCTL_TERM_SECMEM);
#elif defined HAVE_LIBCRYPTO
@@ -295,9 +351,11 @@ int dh_generate_e(ssh_session session) {
}
#ifdef HAVE_LIBGCRYPT
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x, p);
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x,
select_p(type));
#elif defined HAVE_LIBCRYPTO
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x, p, ctx);
bignum_mod_exp(session->next_crypto->e, g, session->next_crypto->x,
select_p(session->next_crypto->kex_type), ctx);
#endif
#ifdef DEBUG_CRYPTO
@@ -328,9 +386,11 @@ int dh_generate_f(ssh_session session) {
}
#ifdef HAVE_LIBGCRYPT
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y, p);
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
select_p(session->next_crypto->kex_type));
#elif defined HAVE_LIBCRYPTO
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y, p, ctx);
bignum_mod_exp(session->next_crypto->f, g, session->next_crypto->y,
select_p(session->next_crypto->kex_type), ctx);
#endif
#ifdef DEBUG_CRYPTO
@@ -460,18 +520,18 @@ int dh_build_k(ssh_session session) {
#ifdef HAVE_LIBGCRYPT
if(session->client) {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->f,
session->next_crypto->x, p);
session->next_crypto->x, select_p(session->next_crypto->kex_type));
} else {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
session->next_crypto->y, p);
session->next_crypto->y, select_p(session->next_crypto->kex_type));
}
#elif defined HAVE_LIBCRYPTO
if (session->client) {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->f,
session->next_crypto->x, p, ctx);
session->next_crypto->x, select_p(session->next_crypto->kex_type), ctx);
} else {
bignum_mod_exp(session->next_crypto->k, session->next_crypto->e,
session->next_crypto->y, p, ctx);
session->next_crypto->y, select_p(session->next_crypto->kex_type), ctx);
}
#endif
@@ -668,7 +728,9 @@ int make_sessionid(ssh_session session) {
if (buffer_add_data(buf, session->next_crypto->server_pubkey, len) < 0) {
goto error;
}
if(session->next_crypto->kex_type == SSH_KEX_DH_GROUP1_SHA1){
if(session->next_crypto->kex_type == SSH_KEX_DH_GROUP1_SHA1 ||
session->next_crypto->kex_type == SSH_KEX_DH_GROUP14_SHA1) {
num = make_bignum_string(session->next_crypto->e);
if (num == NULL) {
goto error;
@@ -718,6 +780,7 @@ int make_sessionid(ssh_session session) {
switch(session->next_crypto->kex_type){
case SSH_KEX_DH_GROUP1_SHA1:
case SSH_KEX_DH_GROUP14_SHA1:
session->next_crypto->digest_len = SHA_DIGEST_LENGTH;
session->next_crypto->mac_type = SSH_MAC_SHA1;
session->next_crypto->session_id = malloc(session->next_crypto->digest_len);

6
src/kex.c
View File

@@ -65,10 +65,10 @@
#endif
#ifdef HAVE_ECDH
#define KEY_EXCHANGE "ecdh-sha2-nistp256,diffie-hellman-group1-sha1"
#define KEY_EXCHANGE "ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1"
#define HOSTKEYS "ecdsa-sha2-nistp256,ssh-rsa,ssh-dss"
#else
#define KEY_EXCHANGE "diffie-hellman-group1-sha1"
#define KEY_EXCHANGE "diffie-hellman-group14-sha1,diffie-hellman-group1-sha1"
#define HOSTKEYS "ssh-rsa,ssh-dss"
#endif
@@ -393,6 +393,8 @@ int ssh_kex_select_methods (ssh_session session){
}
if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group1-sha1") == 0){
session->next_crypto->kex_type=SSH_KEX_DH_GROUP1_SHA1;
} else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "diffie-hellman-group14-sha1") == 0){
session->next_crypto->kex_type=SSH_KEX_DH_GROUP14_SHA1;
} else if(strcmp(session->next_crypto->kex_methods[SSH_KEX], "ecdh-sha2-nistp256") == 0){
session->next_crypto->kex_type=SSH_KEX_ECDH_SHA2_NISTP256;
}

2
src/options.c
View File

@@ -332,7 +332,7 @@ int ssh_options_set_algo(ssh_session session, int algo,
* - SSH_OPTIONS_KEY_EXCHANGE:
* Set the key exchange method to be used (const char *,
* comma-separated list). ex:
* "ecdh-sha2-nistp256,diffie-hellman-group1-sha1"
* "ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1"
*
* - SSH_OPTIONS_HOSTKEYS:
* Set the preferred server host key types (const char *,

1
src/packet_cb.c
View File

@@ -94,6 +94,7 @@ SSH_PACKET_CALLBACK(ssh_packet_dh_reply){
}
switch(session->next_crypto->kex_type){
case SSH_KEX_DH_GROUP1_SHA1:
case SSH_KEX_DH_GROUP14_SHA1:
rc=ssh_client_dh_reply(session, packet);
break;
#ifdef HAVE_ECDH

1
src/server.c
View File

@@ -177,6 +177,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexdh_init){
}
switch(session->next_crypto->kex_type){
case SSH_KEX_DH_GROUP1_SHA1:
case SSH_KEX_DH_GROUP14_SHA1:
rc=ssh_server_kexdh_init(session, packet);
break;
#ifdef HAVE_ECDH