ssh-python/libssh/src/client.c at master · parallel-ssh/ssh-python

860 lines (775 loc) · 25.1 KB
 * client.c - SSH client functions
 * This file is part of the SSH Library
 * Copyright (c) 2003-2013 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"
#include <stdio.h>
#ifndef _WIN32
#include <netinet/in.h>
#include <arpa/inet.h>
#include "libssh/priv.h"
#include "libssh/ssh2.h"
#include "libssh/buffer.h"
#include "libssh/packet.h"
#include "libssh/options.h"
#include "libssh/socket.h"
#include "libssh/session.h"
#include "libssh/dh.h"
#ifdef WITH_GEX
#include "libssh/dh-gex.h"
#endif /* WITH_GEX */
#include "libssh/ecdh.h"
#include "libssh/threads.h"
#include "libssh/misc.h"
#include "libssh/pki.h"
#include "libssh/kex.h"
#define set_status(session, status) do {\
        if (session->common.callbacks && session->common.callbacks->connect_status_function) \
            session->common.callbacks->connect_status_function(session->common.callbacks->userdata, status); \
    } while (0)
 * @internal
 * @brief Callback to be called when the socket is connected or had a
 * connection error. Changes the state of the session and updates the error
 * message.
 * @param code one of SSH_SOCKET_CONNECTED_OK or SSH_SOCKET_CONNECTED_ERROR
 * @param user is a pointer to session
static void socket_callback_connected(int code, int errno_code, void *user)
	ssh_session session=(ssh_session)user;
	if (session->session_state != SSH_SESSION_STATE_CONNECTING &&
	    session->session_state != SSH_SESSION_STATE_SOCKET_CONNECTED)
		ssh_set_error(session,SSH_FATAL, "Wrong state in socket_callback_connected : %d",
				session->session_state);
	SSH_LOG(SSH_LOG_RARE,"Socket connection callback: %d (%d)",code, errno_code);
	if(code == SSH_SOCKET_CONNECTED_OK)
		session->session_state=SSH_SESSION_STATE_SOCKET_CONNECTED;
        char err_msg[SSH_ERRNO_MSG_MAX] = {0};
		session->session_state=SSH_SESSION_STATE_ERROR;
		ssh_set_error(session,SSH_FATAL,"%s",
                      ssh_strerror(errno_code, err_msg, SSH_ERRNO_MSG_MAX));
	session->ssh_connection_callback(session);
 * @internal
 * @brief Gets the banner from socket and saves it in session.
 * Updates the session state
 * @param  data pointer to the beginning of header
 * @param  len size of the banner
 * @param  user is a pointer to session
 * @returns Number of bytes processed, or zero if the banner is not complete.
static size_t callback_receive_banner(const void *data, size_t len, void *user)
    char *buffer = (char *)data;
    ssh_session session = (ssh_session) user;
    char *str = NULL;
    uint32_t i;
    int ret=0;
    if (session->session_state != SSH_SESSION_STATE_SOCKET_CONNECTED) {
        ssh_set_error(session,SSH_FATAL,
                      "Wrong state in callback_receive_banner : %d",
                      session->session_state);
        return 0;
    for (i = 0; i < len; ++i) {
#ifdef WITH_PCAP
        if (session->pcap_ctx && buffer[i] == '\n') {
            ssh_pcap_context_write(session->pcap_ctx,
                                   SSH_PCAP_DIR_IN,
                                   buffer,i+1,
        if (buffer[i] == '\r') {
            buffer[i] = '\0';
        if (buffer[i] == '\n') {
            int cmp;
            buffer[i] = '\0';
            /* The server MAY send other lines of data... */
            cmp = strncmp(buffer, "SSH-", 4);
            if (cmp == 0) {
                str = strdup(buffer);
                if (str == NULL) {
                    return SSH_ERROR;
                /* number of bytes read */
                ret = i + 1;
                session->serverbanner = str;
                session->session_state = SSH_SESSION_STATE_BANNER_RECEIVED;
                SSH_LOG(SSH_LOG_PACKET, "Received banner: %s", str);
                session->ssh_connection_callback(session);
                return ret;
            } else {
                SSH_LOG(SSH_LOG_DEBUG,
                        "ssh_protocol_version_exchange: %s",
                        buffer);
                ret = i + 1;
                break;
        /* According to RFC 4253 the max banner length is 255 */
        if (i > 255) {
            /* Too big banner */
            session->session_state=SSH_SESSION_STATE_ERROR;
            ssh_set_error(session,
                          SSH_FATAL,
                          "Receiving banner: too large banner");
            return 0;
    return ret;
/** @internal
 * @brief Sends a SSH banner to the server.
 * @param session      The SSH session to use.
 * @param server       Send client or server banner.
 * @return 0 on success, < 0 on error.
int ssh_send_banner(ssh_session session, int server)
    const char *banner = CLIENT_BANNER_SSH2;
    const char *terminator = "\r\n";
    /* The maximum banner length is 255 for SSH2 */
    char buffer[256] = {0};
    size_t len;
    int rc = SSH_ERROR;
    if (server == 1) {
        if (session->opts.custombanner == NULL){
            session->serverbanner = strdup(banner);
            if (session->serverbanner == NULL) {
                goto end;
        } else {
            len = strlen(session->opts.custombanner);
            session->serverbanner = malloc(len + 8 + 1);
            if(session->serverbanner == NULL) {
                goto end;
            snprintf(session->serverbanner,
                     "SSH-2.0-%s",
                     session->opts.custombanner);
        snprintf(buffer,
                 sizeof(buffer),
                 "%s%s",
                 session->serverbanner,
                 terminator);
    } else {
        session->clientbanner = strdup(banner);
        if (session->clientbanner == NULL) {
            goto end;
        snprintf(buffer,
                 sizeof(buffer),
                 "%s%s",
                 session->clientbanner,
                 terminator);
    rc = ssh_socket_write(session->socket, buffer, strlen(buffer));
    if (rc == SSH_ERROR) {
        goto end;
#ifdef WITH_PCAP
    if (session->pcap_ctx != NULL) {
        ssh_pcap_context_write(session->pcap_ctx,
                               SSH_PCAP_DIR_OUT,
                               strlen(buffer),
                               strlen(buffer));
    rc = SSH_OK;
    return rc;
/** @internal
 * @brief launches the DH handshake state machine
 * @param session session handle
 * @returns SSH_OK or SSH_ERROR
 * @warning this function returning is no proof that DH handshake is
 * completed
int dh_handshake(ssh_session session)
  int rc = SSH_AGAIN;
  SSH_LOG(SSH_LOG_TRACE, "dh_handshake_state = %d, kex_type = %d",
          session->dh_handshake_state,  session->next_crypto->kex_type);
  switch (session->dh_handshake_state) {
    case DH_STATE_INIT:
      switch(session->next_crypto->kex_type){
        case SSH_KEX_DH_GROUP1_SHA1:
        case SSH_KEX_DH_GROUP14_SHA1:
        case SSH_KEX_DH_GROUP14_SHA256:
        case SSH_KEX_DH_GROUP16_SHA512:
        case SSH_KEX_DH_GROUP18_SHA512:
          rc = ssh_client_dh_init(session);
          break;
#ifdef WITH_GEX
        case SSH_KEX_DH_GEX_SHA1:
        case SSH_KEX_DH_GEX_SHA256:
          rc = ssh_client_dhgex_init(session);
          break;
#endif /* WITH_GEX */
#ifdef HAVE_ECDH
        case SSH_KEX_ECDH_SHA2_NISTP256:
        case SSH_KEX_ECDH_SHA2_NISTP384:
        case SSH_KEX_ECDH_SHA2_NISTP521:
          rc = ssh_client_ecdh_init(session);
          break;
#ifdef HAVE_CURVE25519
        case SSH_KEX_CURVE25519_SHA256:
        case SSH_KEX_CURVE25519_SHA256_LIBSSH_ORG:
          rc = ssh_client_curve25519_init(session);
          break;
        default:
          rc = SSH_ERROR;
      break;
    case DH_STATE_INIT_SENT:
    	/* wait until ssh_packet_dh_reply is called */
    	break;
    case DH_STATE_NEWKEYS_SENT:
    	/* wait until ssh_packet_newkeys is called */
    	break;
    case DH_STATE_FINISHED:
      return SSH_OK;
    default:
      ssh_set_error(session, SSH_FATAL, "Invalid state in dh_handshake(): %d",
          session->dh_handshake_state);
      return SSH_ERROR;
  return rc;
static int ssh_service_request_termination(void *s)
    ssh_session session = (ssh_session)s;
    if (session->session_state == SSH_SESSION_STATE_ERROR ||
        session->auth.service_state != SSH_AUTH_SERVICE_SENT)
        return 1;
        return 0;
 * @addtogroup libssh_session
 * @internal
 * @brief Request a service from the SSH server.
 * Service requests are for example: ssh-userauth, ssh-connection, etc.
 * @param  session      The session to use to ask for a service request.
 * @param  service      The service request.
 * @return SSH_OK on success
 * @return SSH_ERROR on error
 * @return SSH_AGAIN No response received yet
 * @bug actually only works with ssh-userauth
int ssh_service_request(ssh_session session, const char *service)
  int rc = SSH_ERROR;
  if(session->auth.service_state != SSH_AUTH_SERVICE_NONE)
    goto pending;
  rc = ssh_buffer_pack(session->out_buffer,
                       SSH2_MSG_SERVICE_REQUEST,
                       service);
  if (rc != SSH_OK){
      ssh_set_error_oom(session);
      return SSH_ERROR;
  session->auth.service_state = SSH_AUTH_SERVICE_SENT;
  if (ssh_packet_send(session) == SSH_ERROR) {
    ssh_set_error(session, SSH_FATAL,
        "Sending SSH2_MSG_SERVICE_REQUEST failed.");
      return SSH_ERROR;
  SSH_LOG(SSH_LOG_PACKET,
      "Sent SSH_MSG_SERVICE_REQUEST (service %s)", service);
  rc=ssh_handle_packets_termination(session,SSH_TIMEOUT_USER,
      ssh_service_request_termination, session);
  if (rc == SSH_ERROR) {
      return SSH_ERROR;
  switch(session->auth.service_state) {
  case SSH_AUTH_SERVICE_DENIED:
    ssh_set_error(session,SSH_FATAL,"ssh_auth_service request denied");
  case SSH_AUTH_SERVICE_ACCEPTED:
    rc=SSH_OK;
  case SSH_AUTH_SERVICE_SENT:
    rc=SSH_AGAIN;
  case SSH_AUTH_SERVICE_NONE:
    rc=SSH_ERROR;
  return rc;
 * @internal
 * @brief A function to be called each time a step has been done in the
 * connection.
static void ssh_client_connection_callback(ssh_session session)
    int rc;
    SSH_LOG(SSH_LOG_DEBUG, "session_state=%d", session->session_state);
    switch (session->session_state) {
    case SSH_SESSION_STATE_NONE:
    case SSH_SESSION_STATE_CONNECTING:
        break;
    case SSH_SESSION_STATE_SOCKET_CONNECTED:
        ssh_set_fd_towrite(session);
        ssh_send_banner(session, 0);
        break;
    case SSH_SESSION_STATE_BANNER_RECEIVED:
        if (session->serverbanner == NULL) {
            goto error;
        set_status(session, 0.4f);
        SSH_LOG(SSH_LOG_PROTOCOL,
                "SSH server banner: %s", session->serverbanner);
        /* Here we analyze the different protocols the server allows. */
        rc = ssh_analyze_banner(session, 0);
        if (rc < 0) {
            ssh_set_error(session, SSH_FATAL,
                          "No version of SSH protocol usable (banner: %s)",
                          session->serverbanner);
            goto error;
        ssh_packet_register_socket_callback(session, session->socket);
        ssh_packet_set_default_callbacks(session);
        session->session_state = SSH_SESSION_STATE_INITIAL_KEX;
        rc = ssh_set_client_kex(session);
        if (rc != SSH_OK) {
            goto error;
        rc = ssh_send_kex(session);
        if (rc < 0) {
            goto error;
        set_status(session, 0.5f);
        break;
    case SSH_SESSION_STATE_INITIAL_KEX:
        /* TODO: This state should disappear in favor of get_key handle */
        break;
    case SSH_SESSION_STATE_KEXINIT_RECEIVED:
        set_status(session, 0.6f);
        ssh_list_kex(&session->next_crypto->server_kex);
        if ((session->flags & SSH_SESSION_FLAG_KEXINIT_SENT) == 0) {
            /* in rekeying state if next_crypto client_kex might be empty */
            rc = ssh_set_client_kex(session);
            if (rc != SSH_OK) {
                goto error;
            rc = ssh_send_kex(session);
            if (rc < 0) {
                goto error;
        if (ssh_kex_select_methods(session) == SSH_ERROR)
            goto error;
        set_status(session, 0.8f);
        session->session_state = SSH_SESSION_STATE_DH;
        /* If the init packet was already sent in previous step, this will be no
         * operation */
        if (dh_handshake(session) == SSH_ERROR) {
            goto error;
        FALL_THROUGH;
    case SSH_SESSION_STATE_DH:
        if (session->dh_handshake_state == DH_STATE_FINISHED) {
            set_status(session, 1.0f);
            session->connected = 1;
            if (session->flags & SSH_SESSION_FLAG_AUTHENTICATED)
                session->session_state = SSH_SESSION_STATE_AUTHENTICATED;
            else
                session->session_state=SSH_SESSION_STATE_AUTHENTICATING;
        break;
    case SSH_SESSION_STATE_AUTHENTICATING:
        break;
    case SSH_SESSION_STATE_ERROR:
        goto error;
    default:
        ssh_set_error(session, SSH_FATAL, "Invalid state %d",
                      session->session_state);
    return;
    ssh_socket_close(session->socket);
    session->alive = 0;
    session->session_state = SSH_SESSION_STATE_ERROR;
/** @internal
 * @brief describe under which conditions the ssh_connect function may stop
static int ssh_connect_termination(void *user)
    ssh_session session = (ssh_session)user;
    switch (session->session_state) {
    case SSH_SESSION_STATE_ERROR:
    case SSH_SESSION_STATE_AUTHENTICATING:
    case SSH_SESSION_STATE_DISCONNECTED:
        return 1;
    default:
        return 0;
 * @brief Connect to the ssh server.
 * @param[in]  session  The ssh session to connect.
 * @returns             SSH_OK on success, SSH_ERROR on error.
 * @returns             SSH_AGAIN, if the session is in nonblocking mode,
 *                      and call must be done again.
 * @see ssh_new()
 * @see ssh_disconnect()
int ssh_connect(ssh_session session)
    int ret;
    if (!is_ssh_initialized()) {
        ssh_set_error(session, SSH_FATAL,
                      "Library not initialized.");
        return SSH_ERROR;
    if (session == NULL) {
        return SSH_ERROR;
    switch(session->pending_call_state) {
    case SSH_PENDING_CALL_NONE:
        break;
    case SSH_PENDING_CALL_CONNECT:
        goto pending;
    default:
        ssh_set_error(session, SSH_FATAL,
                      "Bad call during pending SSH call in ssh_connect");
        return SSH_ERROR;
    session->alive = 0;
    session->client = 1;
    if (session->opts.fd == SSH_INVALID_SOCKET &&
        session->opts.host == NULL &&
        session->opts.ProxyCommand == NULL)
        ssh_set_error(session, SSH_FATAL, "Hostname required");
        return SSH_ERROR;
    /* If the system configuration files were not yet processed, do it now */
    if (!session->opts.config_processed) {
        ret = ssh_options_parse_config(session, NULL);
        if (ret != 0) {
            ssh_set_error(session, SSH_FATAL,
                          "Failed to process system configuration files");
            return SSH_ERROR;
    ret = ssh_options_apply(session);
    if (ret < 0) {
        ssh_set_error(session, SSH_FATAL, "Couldn't apply options");
        return SSH_ERROR;
    SSH_LOG(SSH_LOG_PROTOCOL,
            "libssh %s, using threading %s",
            ssh_copyright(),
            ssh_threads_get_type());
    session->ssh_connection_callback = ssh_client_connection_callback;
    session->session_state = SSH_SESSION_STATE_CONNECTING;
    ssh_socket_set_callbacks(session->socket, &session->socket_callbacks);
    session->socket_callbacks.connected = socket_callback_connected;
    session->socket_callbacks.data = callback_receive_banner;
    session->socket_callbacks.exception = ssh_socket_exception_callback;
    session->socket_callbacks.userdata = session;
    if (session->opts.fd != SSH_INVALID_SOCKET) {
        session->session_state = SSH_SESSION_STATE_SOCKET_CONNECTED;
        ssh_socket_set_fd(session->socket, session->opts.fd);
        ret = SSH_OK;
#ifndef _WIN32
    } else if (session->opts.ProxyCommand != NULL) {
        ret = ssh_socket_connect_proxycommand(session->socket,
                session->opts.ProxyCommand);
    } else {
        ret = ssh_socket_connect(session->socket,
                                 session->opts.host,
                                 session->opts.port > 0 ? session->opts.port : 22,
                                 session->opts.bindaddr);
    if (ret == SSH_ERROR) {
        return SSH_ERROR;
    set_status(session, 0.2f);
    session->alive = 1;
    SSH_LOG(SSH_LOG_PROTOCOL,
            "Socket connecting, now waiting for the callbacks to work");
    session->pending_call_state = SSH_PENDING_CALL_CONNECT;
    if(ssh_is_blocking(session)) {
        int timeout = (session->opts.timeout * 1000) +
            (session->opts.timeout_usec / 1000);
        if (timeout == 0) {
            timeout = 10 * 1000;
        SSH_LOG(SSH_LOG_PACKET, "Actual timeout : %d", timeout);
        ret = ssh_handle_packets_termination(session, timeout,
                                             ssh_connect_termination, session);
        if (session->session_state != SSH_SESSION_STATE_ERROR &&
            (ret == SSH_ERROR || !ssh_connect_termination(session)))
            ssh_set_error(session, SSH_FATAL,
                          "Timeout connecting to %s", session->opts.host);
            session->session_state = SSH_SESSION_STATE_ERROR;
    } else {
        ret = ssh_handle_packets_termination(session,
                                             SSH_TIMEOUT_NONBLOCKING,
                                             ssh_connect_termination,
        if (ret == SSH_ERROR) {
            session->session_state = SSH_SESSION_STATE_ERROR;
    SSH_LOG(SSH_LOG_PACKET, "current state : %d", session->session_state);
    if (!ssh_is_blocking(session) && !ssh_connect_termination(session)) {
        return SSH_AGAIN;
    session->pending_call_state = SSH_PENDING_CALL_NONE;
    if (session->session_state == SSH_SESSION_STATE_ERROR ||
        session->session_state == SSH_SESSION_STATE_DISCONNECTED)
        return SSH_ERROR;
    return SSH_OK;
 * @brief Get the issue banner from the server.
 * This is the banner showing a disclaimer to users who log in,
 * typically their right or the fact that they will be monitored.
 * @param[in]  session  The SSH session to use.
 * @return A newly allocated string with the banner, NULL on error.
char *ssh_get_issue_banner(ssh_session session)
    if (session == NULL || session->banner == NULL) {
        return NULL;
    return ssh_string_to_char(session->banner);
 * @brief Get the version of the OpenSSH server, if it is not an OpenSSH server
 * then 0 will be returned.
 * You can use the SSH_VERSION_INT macro to compare version numbers.
 * @param[in]  session  The SSH session to use.
 * @return The version number if available, 0 otherwise.
 * int openssh = ssh_get_openssh_version();
 * if (openssh == SSH_INT_VERSION(6, 1, 0)) {
 *     printf("Version match!\m");
 * @endcode
int ssh_get_openssh_version(ssh_session session)
    if (session == NULL) {
        return 0;
    return session->openssh;
 * @brief Add disconnect message when ssh_session is disconnected
 * To add a disconnect message to give peer a better hint.
 * @param  session      The SSH session to use.
 * @param  message      The message to send after the session is disconnected.
 *                      If no message is passed then a default message i.e
 *                      "Bye Bye" will be sent.
ssh_session_set_disconnect_message(ssh_session session, const char *message)
    if (session == NULL) {
        return SSH_ERROR;
    if (message == NULL || strlen(message) == 0) {
        SAFE_FREE(session->disconnect_message);  //To free any message set earlier.
        session->disconnect_message = strdup("Bye Bye") ;
        if (session->disconnect_message == NULL) {
            ssh_set_error_oom(session);
            return SSH_ERROR;
        return SSH_OK;
    SAFE_FREE(session->disconnect_message);  //To free any message set earlier.
    session->disconnect_message = strdup(message);
    if (session->disconnect_message == NULL) {
        ssh_set_error_oom(session);
        return SSH_ERROR;
    return SSH_OK;
 * @brief Disconnect from a session (client or server).
 * The session can then be reused to open a new session.
 * @note Note that this function won't close the socket if it was set with
 * ssh_options_set and SSH_OPTIONS_FD. You're responsible for closing the
 * socket. This is new behavior in libssh 0.10.
 * @param[in]  session  The SSH session to use.
ssh_disconnect(ssh_session session)
    struct ssh_iterator *it;
    int rc;
    if (session == NULL) {
        return;
    if (session->disconnect_message == NULL) {
        session->disconnect_message = strdup("Bye Bye") ;
        if (session->disconnect_message == NULL) {
            ssh_set_error_oom(session);
            goto error;
    if (session->socket != NULL && ssh_socket_is_open(session->socket)) {
        rc = ssh_buffer_pack(session->out_buffer,
                             SSH2_MSG_DISCONNECT,
                             SSH2_DISCONNECT_BY_APPLICATION,
                             session->disconnect_message,
                             ""); /* language tag */
        if (rc != SSH_OK) {
            ssh_set_error_oom(session);
            goto error;
        ssh_packet_send(session);
        /* Do not close the socket, if the fd was set via options. */
        if (session->opts.fd == SSH_INVALID_SOCKET) {
            ssh_socket_close(session->socket);
    session->recv_seq = 0;
    session->send_seq = 0;
    session->alive = 0;
    if (session->socket != NULL){
        ssh_socket_reset(session->socket);
    session->opts.fd = SSH_INVALID_SOCKET;
    session->session_state = SSH_SESSION_STATE_DISCONNECTED;
    session->pending_call_state = SSH_PENDING_CALL_NONE;
    while ((it = ssh_list_get_iterator(session->channels)) != NULL) {
        ssh_channel_do_free(ssh_iterator_value(ssh_channel, it));
        ssh_list_remove(session->channels, it);
    if (session->current_crypto) {
      crypto_free(session->current_crypto);
      session->current_crypto = NULL;
    if (session->next_crypto) {
        crypto_free(session->next_crypto);
        session->next_crypto = crypto_new();
        if (session->next_crypto == NULL) {
            ssh_set_error_oom(session);
    if (session->in_buffer) {
        ssh_buffer_reinit(session->in_buffer);
    if (session->out_buffer) {
        ssh_buffer_reinit(session->out_buffer);
    if (session->in_hashbuf) {
        ssh_buffer_reinit(session->in_hashbuf);
    if (session->out_hashbuf) {
        ssh_buffer_reinit(session->out_hashbuf);
    session->auth.supported_methods = 0;
    SAFE_FREE(session->serverbanner);
    SAFE_FREE(session->clientbanner);
    SAFE_FREE(session->disconnect_message);
    if (session->ssh_message_list) {
        ssh_message msg = NULL;
        while ((msg = ssh_list_pop_head(ssh_message,
                                        session->ssh_message_list)) != NULL) {
              ssh_message_free(msg);
        ssh_list_free(session->ssh_message_list);
        session->ssh_message_list = NULL;
    if (session->packet_callbacks) {
        ssh_list_free(session->packet_callbacks);
        session->packet_callbacks = NULL;
 * @brief Copyright information
 * Returns copyright information
 * @returns SSH_STRING copyright
const char *ssh_copyright(void)
    return SSH_STRINGIFY(LIBSSH_VERSION) " (c) 2003-2023 "
           "Aris Adamantiadis, Andreas Schneider "
           "and libssh contributors. "
           "Distributed under the LGPL, please refer to COPYING "
           "file for information about your rights";
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