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-rw-r--r--src/kex1.c506
1 files changed, 0 insertions, 506 deletions
diff --git a/src/kex1.c b/src/kex1.c
deleted file mode 100644
index 397b3d2f..00000000
--- a/src/kex1.c
+++ /dev/null
@@ -1,506 +0,0 @@
-/*
- * kex.c - key exchange
- *
- * This file is part of the SSH Library
- *
- * Copyright (c) 2003-2008 by Aris Adamantiadis
- *
- * 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
- * the Free Software Foundation; either version 2.1 of the License, or (at your
- * option) any later version.
- *
- * The SSH Library is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- * License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with the SSH Library; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#include "config.h"
-
-#ifndef _WIN32
-#include <arpa/inet.h>
-#endif
-
-#include "libssh/priv.h"
-#include "libssh/buffer.h"
-#include "libssh/crypto.h"
-#include "libssh/kex.h"
-#include "libssh/keys.h"
-#include "libssh/session.h"
-#include "libssh/ssh1.h"
-#include "libssh/wrapper.h"
-#include "libssh/dh.h"
-
-#if defined(HAVE_LIBCRYPTO)
-#include "libcrypto-compat.h"
-#endif
-
-/* SSHv1 functions */
-
-/* makes a STRING contating 3 strings : ssh-rsa1,e and n */
-/* this is a public key in openssh's format */
-static ssh_string make_rsa1_string(ssh_string e, ssh_string n){
- ssh_buffer buffer = NULL;
- ssh_string rsa = NULL;
- ssh_string ret = NULL;
-
- buffer = ssh_buffer_new();
- if (buffer == NULL) {
- goto error;
- }
-
- rsa = ssh_string_from_char("ssh-rsa1");
- if (rsa == NULL) {
- goto error;
- }
-
- if (ssh_buffer_add_ssh_string(buffer, rsa) < 0) {
- goto error;
- }
- if (ssh_buffer_add_ssh_string(buffer, e) < 0) {
- goto error;
- }
- if (ssh_buffer_add_ssh_string(buffer, n) < 0) {
- goto error;
- }
-
- ret = ssh_string_new(ssh_buffer_get_len(buffer));
- if (ret == NULL) {
- goto error;
- }
-
- ssh_string_fill(ret, ssh_buffer_get(buffer), ssh_buffer_get_len(buffer));
-error:
- ssh_buffer_free(buffer);
- ssh_string_free(rsa);
-
- return ret;
-}
-
-static int build_session_id1(ssh_session session, ssh_string servern,
- ssh_string hostn) {
- MD5CTX md5 = NULL;
-
- md5 = md5_init();
- if (md5 == NULL) {
- return -1;
- }
-
-#ifdef DEBUG_CRYPTO
- ssh_print_hexa("host modulus",ssh_string_data(hostn),ssh_string_len(hostn));
- ssh_print_hexa("server modulus",ssh_string_data(servern),ssh_string_len(servern));
-#endif
- md5_update(md5,ssh_string_data(hostn),ssh_string_len(hostn));
- md5_update(md5,ssh_string_data(servern),ssh_string_len(servern));
- md5_update(md5,session->next_crypto->server_kex.cookie,8);
- if(session->next_crypto->session_id != NULL)
- SAFE_FREE(session->next_crypto->session_id);
- session->next_crypto->session_id = malloc(MD5_DIGEST_LEN);
- if(session->next_crypto->session_id == NULL){
- ssh_set_error_oom(session);
- return SSH_ERROR;
- }
- md5_final(session->next_crypto->session_id,md5);
-#ifdef DEBUG_CRYPTO
- ssh_print_hexa("session_id",session->next_crypto->session_id,MD5_DIGEST_LEN);
-#endif
-
- return 0;
-}
-
-/* returns 1 if the modulus of k1 is < than the one of k2 */
-static int modulus_smaller(ssh_public_key k1, ssh_public_key k2){
- bignum n1;
- bignum n2;
- int res;
-#ifdef HAVE_LIBGCRYPT
- gcry_sexp_t sexp;
- sexp=gcry_sexp_find_token(k1->rsa_pub,"n",0);
- n1=gcry_sexp_nth_mpi(sexp,1,GCRYMPI_FMT_USG);
- gcry_sexp_release(sexp);
- sexp=gcry_sexp_find_token(k2->rsa_pub,"n",0);
- n2=gcry_sexp_nth_mpi(sexp,1,GCRYMPI_FMT_USG);
- gcry_sexp_release(sexp);
-#elif defined HAVE_LIBCRYPTO
- RSA_get0_key(k1->rsa_pub, (const BIGNUM **)&n1, NULL, NULL);
- RSA_get0_key(k2->rsa_pub, (const BIGNUM **)&n2, NULL, NULL);
-#endif
- if(bignum_cmp(n1,n2)<0)
- res=1;
- else
- res=0;
-#ifdef HAVE_LIBGCRYPT
- bignum_free(n1);
- bignum_free(n2);
-#endif
- return res;
-
-}
-
-static ssh_string ssh_encrypt_rsa1(ssh_session session,
- ssh_string data,
- ssh_public_key key) {
- ssh_string str = NULL;
- size_t len = ssh_string_len(data);
- size_t size = 0;
-#ifdef HAVE_LIBGCRYPT
- const char *tmp = NULL;
- gcry_sexp_t ret_sexp;
- gcry_sexp_t data_sexp;
-
- if (gcry_sexp_build(&data_sexp, NULL, "(data(flags pkcs1)(value %b))",
- len, ssh_string_data(data))) {
- ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
- return NULL;
- }
- if (gcry_pk_encrypt(&ret_sexp, data_sexp, key->rsa_pub)) {
- gcry_sexp_release(data_sexp);
- ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
- return NULL;
- }
-
- gcry_sexp_release(data_sexp);
-
- data_sexp = gcry_sexp_find_token(ret_sexp, "a", 0);
- if (data_sexp == NULL) {
- ssh_set_error(session, SSH_FATAL, "RSA1 encrypt: libgcrypt error");
- gcry_sexp_release(ret_sexp);
- return NULL;
- }
- tmp = gcry_sexp_nth_data(data_sexp, 1, &size);
- if (*tmp == 0) {
- size--;
- tmp++;
- }
-
- str = ssh_string_new(size);
- if (str == NULL) {
- ssh_set_error(session, SSH_FATAL, "Not enough space");
- gcry_sexp_release(data_sexp);
- gcry_sexp_release(ret_sexp);
- return NULL;
- }
- ssh_string_fill(str, tmp, size);
-
- gcry_sexp_release(data_sexp);
- gcry_sexp_release(ret_sexp);
-#elif defined HAVE_LIBCRYPTO
- size = RSA_size(key->rsa_pub);
-
- str = ssh_string_new(size);
- if (str == NULL) {
- ssh_set_error(session, SSH_FATAL, "Not enough space");
- return NULL;
- }
-
- if (RSA_public_encrypt(len, ssh_string_data(data), ssh_string_data(str), key->rsa_pub,
- RSA_PKCS1_PADDING) < 0) {
- ssh_string_free(str);
- return NULL;
- }
-#endif
-
- return str;
-}
-
-#define ABS(A) ( (A)<0 ? -(A):(A) )
-static ssh_string encrypt_session_key(ssh_session session, ssh_public_key srvkey,
- ssh_public_key hostkey, int slen, int hlen) {
- unsigned char buffer[32] = {0};
- int i;
- ssh_string data1 = NULL;
- ssh_string data2 = NULL;
- if(session->next_crypto->encryptkey != NULL)
- SAFE_FREE(session->next_crypto->encryptkey);
- if(session->next_crypto->decryptkey != NULL)
- SAFE_FREE(session->next_crypto->decryptkey);
- if(session->next_crypto->encryptIV != NULL)
- SAFE_FREE(session->next_crypto->encryptIV);
- if(session->next_crypto->decryptIV != NULL)
- SAFE_FREE(session->next_crypto->decryptIV);
- session->next_crypto->encryptkey = malloc(32);
- session->next_crypto->decryptkey = malloc(32);
- session->next_crypto->encryptIV = malloc(32);
- session->next_crypto->decryptIV = malloc(32);
- if(session->next_crypto->encryptkey == NULL ||
- session->next_crypto->decryptkey == NULL ||
- session->next_crypto->encryptIV == NULL ||
- session->next_crypto->decryptIV == NULL){
- ssh_set_error_oom(session);
- return NULL;
- }
- /* first, generate a session key */
- ssh_get_random(session->next_crypto->encryptkey, 32, 1);
- memcpy(buffer, session->next_crypto->encryptkey, 32);
- memcpy(session->next_crypto->decryptkey, session->next_crypto->encryptkey, 32);
- memset(session->next_crypto->encryptIV, 0, 32);
- memset(session->next_crypto->decryptIV, 0, 32);
-
-#ifdef DEBUG_CRYPTO
- ssh_print_hexa("session key",buffer,32);
-#endif
-
- /* xor session key with session_id */
- for (i = 0; i < 16; i++) {
- buffer[i] ^= session->next_crypto->session_id[i];
- }
- data1 = ssh_string_new(32);
- if (data1 == NULL) {
- return NULL;
- }
- ssh_string_fill(data1, buffer, 32);
- if (ABS(hlen - slen) < 128){
- SSH_LOG(SSH_LOG_FUNCTIONS,
- "Difference between server modulus and host modulus is only %d. "
- "It's illegal and may not work",
- ABS(hlen - slen));
- }
-
- if (modulus_smaller(srvkey, hostkey)) {
- data2 = ssh_encrypt_rsa1(session, data1, srvkey);
- ssh_string_free(data1);
- data1 = NULL;
- if (data2 == NULL) {
- return NULL;
- }
- data1 = ssh_encrypt_rsa1(session, data2, hostkey);
- ssh_string_free(data2);
- if (data1 == NULL) {
- return NULL;
- }
- } else {
- data2 = ssh_encrypt_rsa1(session, data1, hostkey);
- ssh_string_free(data1);
- data1 = NULL;
- if (data2 == NULL) {
- return NULL;
- }
- data1 = ssh_encrypt_rsa1(session, data2, srvkey);
- ssh_string_free(data2);
- if (data1 == NULL) {
- return NULL;
- }
- }
-
- return data1;
-}
-
-/* 2 SSH_SMSG_PUBLIC_KEY
- *
- * 8 bytes anti_spoofing_cookie
- * 32-bit int server_key_bits
- * mp-int server_key_public_exponent
- * mp-int server_key_public_modulus
- * 32-bit int host_key_bits
- * mp-int host_key_public_exponent
- * mp-int host_key_public_modulus
- * 32-bit int protocol_flags
- * 32-bit int supported_ciphers_mask
- * 32-bit int supported_authentications_mask
- */
-/**
- * @brief Wait for a SSH_SMSG_PUBLIC_KEY and does the key exchange
- */
-SSH_PACKET_CALLBACK(ssh_packet_publickey1){
- ssh_string server_exp = NULL;
- ssh_string server_mod = NULL;
- ssh_string host_exp = NULL;
- ssh_string host_mod = NULL;
- ssh_string serverkey = NULL;
- ssh_string hostkey = NULL;
- ssh_public_key srv = NULL;
- ssh_public_key host = NULL;
- uint32_t server_bits;
- uint32_t host_bits;
- uint32_t protocol_flags;
- uint32_t supported_ciphers_mask;
- uint32_t supported_authentications_mask;
- ssh_string enc_session = NULL;
- uint16_t bits;
- int ko;
- uint32_t support_3DES = 0;
- uint32_t support_DES = 0;
- int rc;
-
- (void)type;
- (void)user;
- SSH_LOG(SSH_LOG_PROTOCOL, "Got a SSH_SMSG_PUBLIC_KEY");
- if(session->session_state != SSH_SESSION_STATE_INITIAL_KEX){
- ssh_set_error(session,SSH_FATAL,"SSH_KEXINIT received in wrong state");
- goto error;
- }
- if (ssh_buffer_get_data(packet, session->next_crypto->server_kex.cookie, 8) != 8) {
- ssh_set_error(session, SSH_FATAL, "Can't get cookie in buffer");
- goto error;
- }
-
- ssh_buffer_get_u32(packet, &server_bits);
- server_exp = ssh_buffer_get_mpint(packet);
- if (server_exp == NULL) {
- goto error;
- }
- server_mod = ssh_buffer_get_mpint(packet);
- if (server_mod == NULL) {
- goto error;
- }
- ssh_buffer_get_u32(packet, &host_bits);
- host_exp = ssh_buffer_get_mpint(packet);
- if (host_exp == NULL) {
- goto error;
- }
- host_mod = ssh_buffer_get_mpint(packet);
- if (host_mod == NULL) {
- goto error;
- }
- ssh_buffer_get_u32(packet, &protocol_flags);
- ssh_buffer_get_u32(packet, &supported_ciphers_mask);
- ko = ssh_buffer_get_u32(packet, &supported_authentications_mask);
-
- if ((ko != sizeof(uint32_t)) || !host_mod || !host_exp
- || !server_mod || !server_exp) {
- SSH_LOG(SSH_LOG_RARE, "Invalid SSH_SMSG_PUBLIC_KEY packet");
- ssh_set_error(session, SSH_FATAL, "Invalid SSH_SMSG_PUBLIC_KEY packet");
- goto error;
- }
-
- server_bits = ntohl(server_bits);
- host_bits = ntohl(host_bits);
- protocol_flags = ntohl(protocol_flags);
- supported_ciphers_mask = ntohl(supported_ciphers_mask);
- supported_authentications_mask = ntohl(supported_authentications_mask);
- SSH_LOG(SSH_LOG_PROTOCOL,
- "Server bits: %d; Host bits: %d; Protocol flags: %.8lx; "
- "Cipher mask: %.8lx; Auth mask: %.8lx",
- server_bits,
- host_bits,
- (unsigned long int) protocol_flags,
- (unsigned long int) supported_ciphers_mask,
- (unsigned long int) supported_authentications_mask);
-
- serverkey = make_rsa1_string(server_exp, server_mod);
- if (serverkey == NULL) {
- goto error;
- }
- hostkey = make_rsa1_string(host_exp,host_mod);
- if (hostkey == NULL) {
- goto error;
- }
- if (build_session_id1(session, server_mod, host_mod) < 0) {
- goto error;
- }
-
- srv = publickey_from_string(session, serverkey);
- if (srv == NULL) {
- goto error;
- }
- host = publickey_from_string(session, hostkey);
- if (host == NULL) {
- goto error;
- }
-
- rc = ssh_dh_import_next_pubkey_blob(session, hostkey);
- if (rc != SSH_OK) {
- goto error;
- }
-
- /* now, we must choose an encryption algo */
- /* hardcode 3des */
- //
- support_3DES = (supported_ciphers_mask & (1<<SSH_CIPHER_3DES));
- support_DES = (supported_ciphers_mask & (1<<SSH_CIPHER_DES));
- if(!support_3DES && !support_DES){
- ssh_set_error(session, SSH_FATAL, "Remote server doesn't accept 3DES");
- goto error;
- }
- SSH_LOG(SSH_LOG_PROTOCOL, "Sending SSH_CMSG_SESSION_KEY");
-
- if (ssh_buffer_add_u8(session->out_buffer, SSH_CMSG_SESSION_KEY) < 0) {
- goto error;
- }
- if (ssh_buffer_add_u8(session->out_buffer, support_3DES ? SSH_CIPHER_3DES : SSH_CIPHER_DES) < 0) {
- goto error;
- }
- if (ssh_buffer_add_data(session->out_buffer, session->next_crypto->server_kex.cookie, 8) < 0) {
- goto error;
- }
-
- enc_session = encrypt_session_key(session, srv, host, server_bits, host_bits);
- if (enc_session == NULL) {
- goto error;
- }
-
- bits = ssh_string_len(enc_session) * 8 - 7;
- SSH_LOG(SSH_LOG_PROTOCOL, "%d bits, %" PRIdS " bytes encrypted session",
- bits, ssh_string_len(enc_session));
- bits = htons(bits);
- /* the encrypted mpint */
- if (ssh_buffer_add_data(session->out_buffer, &bits, sizeof(uint16_t)) < 0) {
- goto error;
- }
- if (ssh_buffer_add_data(session->out_buffer, ssh_string_data(enc_session),
- ssh_string_len(enc_session)) < 0) {
- goto error;
- }
- /* the protocol flags */
- if (ssh_buffer_add_u32(session->out_buffer, 0) < 0) {
- goto error;
- }
- session->session_state=SSH_SESSION_STATE_KEXINIT_RECEIVED;
- if (ssh_packet_send(session) == SSH_ERROR) {
- goto error;
- }
-
- /* we can set encryption */
- if(crypt_set_algorithms(session, support_3DES ? SSH_3DES : SSH_DES)){
- goto error;
- }
-
- session->current_crypto = session->next_crypto;
- session->next_crypto = NULL;
- goto end;
-error:
- session->session_state=SSH_SESSION_STATE_ERROR;
-end:
-
- ssh_string_free(host_mod);
- ssh_string_free(host_exp);
- ssh_string_free(server_mod);
- ssh_string_free(server_exp);
- ssh_string_free(serverkey);
- ssh_string_free(hostkey);
- ssh_string_free(enc_session);
-
- publickey_free(srv);
- publickey_free(host);
-
- return SSH_PACKET_USED;
-}
-
-int ssh_get_kex1(ssh_session session) {
- SSH_LOG(SSH_LOG_PROTOCOL, "Waiting for a SSH_SMSG_PUBLIC_KEY");
-
- /* Here the callback is called */
- while(session->session_state==SSH_SESSION_STATE_INITIAL_KEX){
- ssh_handle_packets(session, SSH_TIMEOUT_USER);
- }
- if (session->session_state==SSH_SESSION_STATE_ERROR) {
- return SSH_ERROR;
- }
- SSH_LOG(SSH_LOG_PROTOCOL, "Waiting for a SSH_SMSG_SUCCESS");
- /* Waiting for SSH_SMSG_SUCCESS */
- while(session->session_state==SSH_SESSION_STATE_KEXINIT_RECEIVED){
- ssh_handle_packets(session, SSH_TIMEOUT_USER);
- }
- if(session->session_state==SSH_SESSION_STATE_ERROR) {
- return SSH_ERROR;
- }
- SSH_LOG(SSH_LOG_PROTOCOL, "received SSH_SMSG_SUCCESS");
-
- return SSH_OK;
-}