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packet SSH_KEXINIT received and parsed

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Resolved some bugs in the callback mechanism as well
This commit is contained in:
Aris Adamantiadis
2009-12-12 00:23:53 +01:00
parent 3ace7817b4
commit ad7e9d88fb
7 changed files with 94 additions and 56 deletions
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30
include/libssh/kex.h Normal file
View File

@ -0,0 +1,30 @@
/*
* This file is part of the SSH Library
*
* Copyright (c) 2009 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.
*/
#ifndef KEX_H_
#define KEX_H_
#include "libssh/priv.h"
#include "libssh/callbacks.h"
SSH_PACKET_CALLBACK(ssh_packet_kexinit);
#endif /* KEX_H_ */

2
include/libssh/priv.h
View File

@ -120,6 +120,7 @@ SSH_PACKET_CALLBACK(ssh_packet_ignore_callback);
/* client.c */
int ssh_send_banner(ssh_session session, int is_server);
void ssh_connection_callback(ssh_session session);
/* config.c */
int ssh_config_parse_file(ssh_session session, const char *filename);
@ -156,7 +157,6 @@ extern const char *ssh_kex_nums[];
int ssh_send_kex(ssh_session session, int server_kex);
void ssh_list_kex(ssh_session session, KEX *kex);
int set_kex(ssh_session session);
int ssh_get_kex(ssh_session session, int server_kex);
int verify_existing_algo(int algo, const char *name);
char **space_tokenize(const char *chain);
int ssh_get_kex1(ssh_session session);

2
include/libssh/session.h
View File

@ -34,6 +34,8 @@ enum ssh_session_state_e {
SSH_SESSION_STATE_SOCKET_CONNECTED,
SSH_SESSION_STATE_BANNER_RECEIVED,
SSH_SESSION_STATE_INITIAL_KEX,
SSH_SESSION_STATE_KEXINIT_RECEIVED,
SSH_SESSION_STATE_DH,
SSH_SESSION_STATE_AUTHENTICATING,
SSH_SESSION_STATE_AUTHENTICATED,
SSH_SESSION_STATE_ERROR

67
libssh/client.c
View File

@ -42,7 +42,6 @@
session->callbacks->connect_status_function(session->callbacks->userdata, status); \
} while (0)
static void connection_callback(ssh_session session);
/**
* @internal
* @brief Callback to be called when the socket is connected or had a
@ -61,7 +60,7 @@ static void socket_callback_connected(int code, int errno, void *user){
session->session_state=SSH_SESSION_STATE_ERROR;
ssh_set_error(session,SSH_FATAL,"Connection failed: %s",strerror(errno));
}
connection_callback(session);
ssh_connection_callback(session);
leave_function();
}
@ -76,7 +75,7 @@ static void socket_callback_exception(int code, int errno, void *user){
ssh_log(session,SSH_LOG_RARE,"Socket exception callback: %d (%d)",code, errno);
session->session_state=SSH_SESSION_STATE_ERROR;
ssh_set_error(session,SSH_FATAL,"Socket error: %s",strerror(errno));
connection_callback(session);
ssh_connection_callback(session);
leave_function();
}
@ -114,7 +113,7 @@ static int callback_receive_banner(const void *data, size_t len, void *user) {
session->serverbanner=str;
session->session_state=SSH_SESSION_STATE_BANNER_RECEIVED;
ssh_log(session,SSH_LOG_PACKET,"Received banner: %s",str);
connection_callback(session);
ssh_connection_callback(session);
leave_function();
return ret;
}
@ -519,7 +518,7 @@ int ssh_service_request(ssh_session session, const char *service) {
/** @internal
* @function to be called each time a step has been done in the connection
*/
static void connection_callback(ssh_session session){
void ssh_connection_callback(ssh_session session){
int ssh1,ssh2;
enter_function();
switch(session->session_state){
@ -558,35 +557,37 @@ static void connection_callback(ssh_session session){
session->session_state=SSH_SESSION_STATE_INITIAL_KEX;
break;
case SSH_SESSION_STATE_INITIAL_KEX:
switch (session->version) {
case 2:
ssh_get_kex(session,0);
set_status(session,0.6);
ssh_list_kex(session, &session->server_kex);
if (set_kex(session) < 0) {
goto error;
}
if (ssh_send_kex(session, 0) < 0) {
goto error;
}
set_status(session,0.8);
if (dh_handshake(session) < 0) {
goto error;
}
set_status(session,1.0);
session->connected = 1;
break;
case 1:
if (ssh_get_kex1(session) < 0)
goto error;
set_status(session,0.6);
session->connected = 1;
break;
if(session->version==1){
if (ssh_get_kex1(session) < 0)
goto error;
set_status(session,0.6);
session->connected = 1;
session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
break;
}
session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
case SSH_SESSION_STATE_KEXINIT_RECEIVED:
set_status(session,0.6);
ssh_list_kex(session, &session->server_kex);
if (set_kex(session) < 0) {
goto error;
}
if (ssh_send_kex(session, 0) < 0) {
goto error;
}
set_status(session,0.8);
session->session_state=SSH_SESSION_STATE_DH;
break;
case SSH_SESSION_STATE_DH:
if (dh_handshake(session) < 0) {
goto error;
}
if(session->dh_handshake_state==DH_STATE_FINISHED){
set_status(session,1.0);
session->connected = 1;
break;
session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
}
break;
case SSH_SESSION_STATE_AUTHENTICATING:
break;
default:

35
libssh/kex.c
View File

@ -40,6 +40,7 @@
#include "libssh/wrapper.h"
#include "libssh/keys.h"
#include "libssh/dh.h"
#include "libssh/kex.h"
#ifdef HAVE_LIBGCRYPT
#define BLOWFISH "blowfish-cbc,"
@ -239,34 +240,33 @@ char *ssh_find_matching(const char *in_d, const char *what_d){
return NULL;
}
int ssh_get_kex(ssh_session session, int server_kex) {
SSH_PACKET_CALLBACK(ssh_packet_kexinit){
int server_kex=session->server;
ssh_string str = NULL;
char *strings[10];
int i;
enter_function();
if (packet_wait(session, SSH2_MSG_KEXINIT, 1) != SSH_OK) {
leave_function();
return -1;
(void)type;
(void)user;
if(session->session_state != SSH_SESSION_STATE_INITIAL_KEX){
ssh_set_error(session,SSH_FATAL,"SSH_KEXINIT received in wrong state");
goto error;
}
if (buffer_get_data(session->in_buffer,session->server_kex.cookie,16) != 16) {
ssh_set_error(session, SSH_FATAL, "get_kex(): no cookie in packet");
leave_function();
return -1;
if (buffer_get_data(packet,session->server_kex.cookie,16) != 16) {
ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: no cookie in packet");
goto error;
}
if (hashbufin_add_cookie(session, session->server_kex.cookie) < 0) {
ssh_set_error(session, SSH_FATAL, "get_kex(): adding cookie failed");
leave_function();
return -1;
ssh_set_error(session, SSH_FATAL, "ssh_packet_kexinit: adding cookie failed");
goto error;
}
memset(strings, 0, sizeof(char *) * 10);
for (i = 0; i < 10; i++) {
str = buffer_get_ssh_string(session->in_buffer);
str = buffer_get_ssh_string(packet);
if (str == NULL) {
break;
}
@ -307,15 +307,18 @@ int ssh_get_kex(ssh_session session, int server_kex) {
}
leave_function();
return 0;
session->session_state=SSH_SESSION_STATE_KEXINIT_RECEIVED;
ssh_connection_callback(session);
return SSH_PACKET_USED;
error:
string_free(str);
for (i = 0; i < 10; i++) {
SAFE_FREE(strings[i]);
}
session->session_state = SSH_SESSION_STATE_ERROR;
leave_function();
return -1;
return SSH_PACKET_USED;
}
void ssh_list_kex(ssh_session session, KEX *kex) {

7
libssh/packet.c
View File

@ -44,6 +44,7 @@
#include "libssh/session.h"
#include "libssh/messages.h"
#include "libssh/pcap.h"
#include "libssh/kex.h"
ssh_packet_callback default_packet_handlers[]= {
@ -55,7 +56,7 @@ ssh_packet_callback default_packet_handlers[]= {
NULL, //#define SSH2_MSG_SERVICE_ACCEPT 6
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, // 7-19
NULL, //#define SSH2_MSG_KEXINIT 20
ssh_packet_kexinit, //#define SSH2_MSG_KEXINIT 20
NULL, //#define SSH2_MSG_NEWKEYS 21
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, //22-29
NULL, //#define SSH2_MSG_KEXDH_INIT 30 SSH2_MSG_KEX_DH_GEX_REQUEST_OLD 30
@ -298,7 +299,7 @@ void ssh_packet_set_callbacks(ssh_session session, ssh_packet_callbacks callback
* @brief sets the default packet handlers
*/
void ssh_packet_set_default_callbacks(ssh_session session){
session->default_packet_callbacks.start=0;
session->default_packet_callbacks.start=1;
session->default_packet_callbacks.n_callbacks=sizeof(default_packet_handlers)/sizeof(ssh_packet_callback);
session->default_packet_callbacks.user=session;
session->default_packet_callbacks.callbacks=default_packet_handlers;
@ -327,7 +328,7 @@ void ssh_packet_process(ssh_session session, uint8_t type){
continue;
if(cb->start > type)
continue;
if(cb->start + cb->n_callbacks > type)
if(cb->start + cb->n_callbacks <= type)
continue;
if(cb->callbacks[type - cb->start]==NULL)
continue;

7
libssh/server.c
View File

@ -528,9 +528,10 @@ int ssh_accept(ssh_session session) {
return -1;
}
if (ssh_get_kex(session,1) < 0) {
return -1;
}
/* TODO here things won't work anymore */
// if (ssh_get_kex(session,1) < 0) {
// return -1;
// }
ssh_list_kex(session, &session->client_kex);
crypt_set_algorithms_server(session);