guacamole-spice-protocol/protocols/ssh/src/ssh_client.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac-client-ssh.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <libssh/libssh.h>
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#include <guacamole/log.h>
#include <guacamole/guacio.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include "ssh_client.h"
#include "ssh_handlers.h"
#include "ssh_terminal.h"
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/* Client plugin arguments */
const char* GUAC_CLIENT_ARGS[] = {
"hostname",
"user",
"password",
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NULL
};
int ssh_guac_client_password_key_handler(guac_client* client, int keysym, int pressed) {
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
/* If key pressed */
if (pressed) {
/* If simple ASCII key */
if (keysym >= 0x00 && keysym <= 0xFF) {
/* Add to password */
client_data->password[client_data->password_length++] = keysym;
ssh_guac_terminal_write(client_data->term, "*", 1);
ssh_guac_terminal_redraw_cursor(client_data->term);
guac_flush(client->io);
}
else if (keysym == 0xFF08) {
if (client_data->password_length > 0) {
client_data->password_length--;
/* Backspace */
ssh_guac_terminal_write(client_data->term, "\x08\x1B[K", 4);
ssh_guac_terminal_redraw_cursor(client_data->term);
guac_flush(client->io);
}
}
else if (keysym == 0xFF0D) {
/* Finish password */
client_data->password[client_data->password_length] = '\0';
/* Clear screen */
ssh_guac_terminal_write(client_data->term, "\x1B[2J\x1B[1;1H", 10);
ssh_guac_terminal_redraw_cursor(client_data->term);
guac_flush(client->io);
return ssh_guac_client_auth(client, client_data->password);
}
}
return 0;
}
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int guac_client_init(guac_client* client, int argc, char** argv) {
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GUACIO* io = client->io;
ssh_guac_client_data* client_data = malloc(sizeof(ssh_guac_client_data));
ssh_guac_terminal* term = ssh_guac_terminal_create(client);
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/* Init client data */
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client->data = client_data;
client_data->term = term;
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/* Send name and dimensions */
guac_send_name(io, "SSH TEST");
guac_send_size(io,
term->char_width * term->term_width,
term->char_height * term->term_height);
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guac_flush(io);
/* Open SSH session */
client_data->session = ssh_new();
if (client_data->session == NULL) {
guac_send_error(io, "Unable to create SSH session.");
guac_flush(io);
return 1;
}
/* Set session options */
ssh_options_set(client_data->session, SSH_OPTIONS_HOST, argv[0]);
ssh_options_set(client_data->session, SSH_OPTIONS_USER, argv[1]);
/* Connect */
if (ssh_connect(client_data->session) != SSH_OK) {
guac_send_error(io, "Unable to connect via SSH.");
guac_flush(io);
return 1;
}
/* If password provided, authenticate now */
if (argv[2][0] != '\0')
return ssh_guac_client_auth(client, argv[2]);
/* Otherwise, prompt for password */
else {
client_data->password_length = 0;
ssh_guac_terminal_write(client_data->term, "Password: ", 10);
ssh_guac_terminal_redraw_cursor(client_data->term);
guac_flush(client->io);
client->key_handler = ssh_guac_client_password_key_handler;
}
/* Success */
return 0;
}
int ssh_guac_client_auth(guac_client* client, const char* password) {
GUACIO* io = client->io;
ssh_guac_client_data* client_data = (ssh_guac_client_data*) client->data;
ssh_guac_terminal* term = client_data->term;
/* Authenticate */
if (ssh_userauth_password(client_data->session, NULL, password) != SSH_AUTH_SUCCESS) {
guac_send_error(io, "SSH auth failed.");
guac_flush(io);
return 1;
}
/* Open channel for terminal */
client_data->term_channel = channel_new(client_data->session);
if (client_data->term_channel == NULL) {
guac_send_error(io, "Unable to open channel.");
guac_flush(io);
return 1;
}
/* Open session for channel */
if (channel_open_session(client_data->term_channel) != SSH_OK) {
guac_send_error(io, "Unable to open channel session.");
guac_flush(io);
return 1;
}
/* Request PTY */
if (channel_request_pty(client_data->term_channel) != SSH_OK) {
guac_send_error(io, "Unable to allocate PTY for channel.");
guac_flush(io);
return 1;
}
/* Request PTY size */
if (channel_change_pty_size(client_data->term_channel, term->term_width, term->term_height) != SSH_OK) {
guac_send_error(io, "Unable to change PTY size.");
guac_flush(io);
return 1;
}
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/* Request shell */
if (channel_request_shell(client_data->term_channel) != SSH_OK) {
guac_send_error(io, "Unable to associate shell with PTY.");
guac_flush(io);
return 1;
}
guac_log_info("SSH connection successful.");
/* Set handlers */
client->handle_messages = ssh_guac_client_handle_messages;
client->key_handler = ssh_guac_client_key_handler;
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/* Success */
return 0;
}