int ssh_execute_message_callbacks(ssh_session session){
ssh_message msg=NULL;
int ret;
ssh_handle_packets(session, SSH_TIMEOUT_NONBLOCKING);
if(!session->ssh_message_list)
return SSH_OK;
if(session->ssh_message_callback){
while((msg=ssh_message_pop_head(session)) != NULL) {
ret=session->ssh_message_callback(session,msg,
session->ssh_message_callback_data);
if(ret==1){
ret = ssh_message_reply_default(msg);
ssh_message_free(msg);
if(ret != SSH_OK)
return ret;
} else {
ssh_message_free(msg);
}
}
} else {
while((msg=ssh_message_pop_head(session)) != NULL) {
ret = ssh_message_reply_default(msg);
ssh_message_free(msg);
if(ret != SSH_OK)
return ret;
}
}
return SSH_OK;
}
int channel_write1(ssh_channel channel, const void *data, int len) {
ssh_session session;
int origlen = len;
int effectivelen;
const unsigned char *ptr=data;
if (channel == NULL) {
return -1;
}
session = channel->session;
while (len > 0) {
if (buffer_add_u8(session->out_buffer, SSH_CMSG_STDIN_DATA) < 0) {
return -1;
}
effectivelen = len > 32000 ? 32000 : len;
if (buffer_add_u32(session->out_buffer, htonl(effectivelen)) < 0 ||
buffer_add_data(session->out_buffer, ptr, effectivelen) < 0) {
return -1;
}
ptr += effectivelen;
len -= effectivelen;
if (packet_send(session) == SSH_ERROR) {
return -1;
}
ssh_handle_packets(session, SSH_TIMEOUT_NONBLOCKING);
}
if (ssh_blocking_flush(session,SSH_TIMEOUT_USER) == SSH_ERROR)
return -1;
return origlen;
}
int ssh_send_keepalive(ssh_session session)
{
int rc;
rc = ssh_buffer_pack(session->out_buffer,
"bsb",
SSH2_MSG_GLOBAL_REQUEST,
"*****@*****.**",
1);
if (rc != SSH_OK) {
goto err;
}
if (packet_send(session) == SSH_ERROR) {
goto err;
}
ssh_handle_packets(session, SSH_TIMEOUT_NONBLOCKING);
SSH_LOG(SSH_LOG_PACKET, "Sent a keepalive");
return SSH_OK;
err:
ssh_set_error_oom(session);
ssh_buffer_reinit(session->out_buffer);
return SSH_ERROR;
}
int ssh_send_keepalive(ssh_session session)
{
/* TODO check the reply and all that */
struct ssh_string_struct *req;
int reply = 1;
int rc = SSH_ERROR;
enter_function();
req = ssh_string_from_char("*****@*****.**");
if (req == NULL) {
ssh_set_error_oom(session);
goto out;
}
if (buffer_add_u8(session->out_buffer, SSH2_MSG_GLOBAL_REQUEST) < 0 ||
buffer_add_ssh_string(session->out_buffer, req) < 0 ||
buffer_add_u8(session->out_buffer, reply == 0 ? 0 : 1) < 0) {
ssh_set_error_oom(session);
goto out;
}
if (packet_send(session) == SSH_ERROR)
goto out;
ssh_handle_packets(session, 0);
ssh_log(session, SSH_LOG_PACKET, "Sent a keepalive");
rc = SSH_OK;
out:
ssh_string_free(req);
leave_function();
return rc;
}
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\n");
return SSH_OK;
}
int ssh_get_kex1(ssh_session session) {
int ret=SSH_ERROR;
enter_function();
ssh_log(session, 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, -2);
}
if(session->session_state==SSH_SESSION_STATE_ERROR)
goto error;
ssh_log(session, 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, -2);
}
if(session->session_state==SSH_SESSION_STATE_ERROR)
goto error;
ssh_log(session, SSH_LOG_PROTOCOL, "received SSH_SMSG_SUCCESS\n");
ret=SSH_OK;
error:
leave_function();
return ret;
}
int channel_change_pty_size1(ssh_channel channel, int cols, int rows) {
ssh_session session;
if (channel == NULL) {
return SSH_ERROR;
}
session = channel->session;
if(channel->request_state != SSH_CHANNEL_REQ_STATE_NONE){
ssh_set_error(session,SSH_REQUEST_DENIED,"Wrong request state");
return SSH_ERROR;
}
if (buffer_add_u8(session->out_buffer, SSH_CMSG_WINDOW_SIZE) < 0 ||
buffer_add_u32(session->out_buffer, ntohl(rows)) < 0 ||
buffer_add_u32(session->out_buffer, ntohl(cols)) < 0 ||
buffer_add_u32(session->out_buffer, 0) < 0 ||
buffer_add_u32(session->out_buffer, 0) < 0) {
return SSH_ERROR;
}
channel->request_state=SSH_CHANNEL_REQ_STATE_PENDING;
if (packet_send(session) == SSH_ERROR) {
return SSH_ERROR;
}
ssh_log(session, SSH_LOG_PROTOCOL, "Change pty size send");
while(channel->request_state==SSH_CHANNEL_REQ_STATE_PENDING){
ssh_handle_packets(session, SSH_TIMEOUT_INFINITE);
}
switch(channel->request_state){
case SSH_CHANNEL_REQ_STATE_ERROR:
case SSH_CHANNEL_REQ_STATE_PENDING:
case SSH_CHANNEL_REQ_STATE_NONE:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
return SSH_ERROR;
case SSH_CHANNEL_REQ_STATE_ACCEPTED:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
ssh_log(session, SSH_LOG_PROTOCOL, "pty size changed");
return SSH_OK;
case SSH_CHANNEL_REQ_STATE_DENIED:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
ssh_log(session, SSH_LOG_RARE, "pty size change denied");
ssh_set_error(session, SSH_REQUEST_DENIED, "pty size change denied");
return SSH_ERROR;
}
// Not reached
return SSH_ERROR;
}
/*
* This function acts as a meta select.
*
* First, channels are analyzed to seek potential can-write or can-read ones,
* then if no channel has been elected, it goes in a loop with the posix
* select(2).
* This is made in two parts: protocol select and network select. The protocol
* select does not use the network functions at all
*/
static int channel_protocol_select(CHANNEL **rchans, CHANNEL **wchans,
CHANNEL **echans, CHANNEL **rout, CHANNEL **wout, CHANNEL **eout) {
CHANNEL *chan;
int i;
int j = 0;
for (i = 0; rchans[i] != NULL; i++) {
chan = rchans[i];
while (chan->open && ssh_socket_data_available(chan->session->socket)) {
ssh_handle_packets(chan->session);
}
if ((chan->stdout_buffer && buffer_get_len(chan->stdout_buffer) > 0) ||
(chan->stderr_buffer && buffer_get_len(chan->stderr_buffer) > 0) ||
chan->remote_eof) {
rout[j] = chan;
j++;
}
}
rout[j] = NULL;
j = 0;
for(i = 0; wchans[i] != NULL; i++) {
chan = wchans[i];
/* It's not our business to seek if the file descriptor is writable */
if (ssh_socket_data_writable(chan->session->socket) &&
chan->open && (chan->remote_window > 0)) {
wout[j] = chan;
j++;
}
}
wout[j] = NULL;
j = 0;
for (i = 0; echans[i] != NULL; i++) {
chan = echans[i];
if (!ssh_socket_is_open(chan->session->socket) || !chan->open) {
eout[j] = chan;
j++;
}
}
eout[j] = NULL;
return 0;
}
static int wait_auth1_status(ssh_session session) {
enter_function();
/* wait for a packet */
while(session->auth_state == SSH_AUTH_STATE_NONE)
if (ssh_handle_packets(session, -2) != SSH_OK)
break;
ssh_log(session,SSH_LOG_PROTOCOL,"Auth state : %d",session->auth_state);
leave_function();
switch(session->auth_state) {
case SSH_AUTH_STATE_SUCCESS:
return SSH_AUTH_SUCCESS;
case SSH_AUTH_STATE_FAILED:
return SSH_AUTH_DENIED;
default:
return SSH_AUTH_ERROR;
}
return SSH_AUTH_ERROR;
}
/* Do the banner and key exchange */
int ssh_handle_key_exchange(ssh_session session) {
int rc;
rc = ssh_send_banner(session, 1);
if (rc < 0) {
return SSH_ERROR;
}
session->alive = 1;
session->ssh_connection_callback = ssh_server_connection_callback;
session->session_state = SSH_SESSION_STATE_SOCKET_CONNECTED;
ssh_socket_set_callbacks(session->socket,&session->socket_callbacks);
session->socket_callbacks.data=callback_receive_banner;
session->socket_callbacks.exception=ssh_socket_exception_callback;
session->socket_callbacks.userdata=session;
rc = server_set_kex(session);
if (rc < 0) {
return SSH_ERROR;
}
while (session->session_state != SSH_SESSION_STATE_ERROR &&
session->session_state != SSH_SESSION_STATE_AUTHENTICATING &&
session->session_state != SSH_SESSION_STATE_DISCONNECTED) {
/*
* loop until SSH_SESSION_STATE_BANNER_RECEIVED or
* SSH_SESSION_STATE_ERROR
*/
ssh_handle_packets(session, -2);
ssh_log(session,SSH_LOG_PACKET, "ssh_handle_key_exchange: Actual state : %d",
session->session_state);
}
if (session->session_state == SSH_SESSION_STATE_ERROR ||
session->session_state == SSH_SESSION_STATE_DISCONNECTED) {
return SSH_ERROR;
}
return SSH_OK;
}
int ssh_send_keepalive(ssh_session session)
{
struct ssh_string_struct *req;
int rc;
rc = buffer_add_u8(session->out_buffer, SSH2_MSG_GLOBAL_REQUEST);
if (rc < 0) {
goto err;
}
req = ssh_string_from_char("*****@*****.**");
if (req == NULL) {
goto err;
}
rc = buffer_add_ssh_string(session->out_buffer, req);
ssh_string_free(req);
if (rc < 0) {
goto err;
}
rc = buffer_add_u8(session->out_buffer, 1);
if (rc < 0) {
goto err;
}
if (packet_send(session) == SSH_ERROR) {
goto err;
}
ssh_handle_packets(session, 0);
SSH_LOG(SSH_LOG_PACKET, "Sent a keepalive");
return SSH_OK;
err:
ssh_set_error_oom(session);
ssh_buffer_reinit(session->out_buffer);
return SSH_ERROR;
}
/**
* @brief Retrieve a SSH message from a SSH session.
*
* @param[in] session The SSH session to get the message.
*
* @returns The SSH message received, NULL in case of error.
*
* @warning This function blocks until a message has been received. Betterset up
* a callback if this behavior is unwanted.
*/
ssh_message ssh_message_get(ssh_session session) {
ssh_message msg = NULL;
enter_function();
msg=ssh_message_pop_head(session);
if(msg) {
leave_function();
return msg;
}
if(session->ssh_message_list == NULL) {
session->ssh_message_list = ssh_list_new();
}
do {
if (ssh_handle_packets(session,-1) == SSH_ERROR) {
leave_function();
return NULL;
}
msg=ssh_list_pop_head(ssh_message, session->ssh_message_list);
} while(msg==NULL);
leave_function();
return msg;
}
/**
* @brief Polls a channel for data to read.
*
* @param channel The channel to poll.
*
* @param is_stderr A boolean to select the stderr stream.
*
* @return The number of bytes available for reading, 0 if nothing is available
* or SSH_ERROR on error.
*
* @warning When the channel is in EOF state, the function returns SSH_EOF.
*
* @see channel_is_eof()
*/
int channel_poll(CHANNEL *channel, int is_stderr){
SSH_SESSION *session = channel->session;
BUFFER *stdbuf = channel->stdout_buffer;
enter_function();
if (is_stderr) {
stdbuf = channel->stderr_buffer;
}
while (buffer_get_rest_len(stdbuf) == 0 && channel->remote_eof == 0) {
if (ssh_handle_packets(channel->session) <= 0) {
break;
}
}
if (channel->remote_eof) {
leave_function();
return SSH_EOF;
}
leave_function();
return buffer_get_rest_len(stdbuf);
}
int channel_request_pty_size1(ssh_channel channel, const char *terminal, int col,
int row) {
ssh_session session;
ssh_string str = NULL;
if (channel == NULL) {
return SSH_ERROR;
}
session = channel->session;
if(channel->request_state != SSH_CHANNEL_REQ_STATE_NONE){
ssh_set_error(session,SSH_REQUEST_DENIED,"Wrong request state");
return SSH_ERROR;
}
str = ssh_string_from_char(terminal);
if (str == NULL) {
ssh_set_error_oom(session);
return -1;
}
if (buffer_add_u8(session->out_buffer, SSH_CMSG_REQUEST_PTY) < 0 ||
buffer_add_ssh_string(session->out_buffer, str) < 0) {
ssh_string_free(str);
return -1;
}
ssh_string_free(str);
if (buffer_add_u32(session->out_buffer, ntohl(row)) < 0 ||
buffer_add_u32(session->out_buffer, ntohl(col)) < 0 ||
buffer_add_u32(session->out_buffer, 0) < 0 || /* x */
buffer_add_u32(session->out_buffer, 0) < 0 || /* y */
buffer_add_u8(session->out_buffer, 0) < 0) { /* tty things */
return -1;
}
ssh_log(session, SSH_LOG_FUNCTIONS, "Opening a ssh1 pty");
channel->request_state = SSH_CHANNEL_REQ_STATE_PENDING;
if (packet_send(session) == SSH_ERROR) {
return -1;
}
while (channel->request_state == SSH_CHANNEL_REQ_STATE_PENDING) {
ssh_handle_packets(session, SSH_TIMEOUT_INFINITE);
}
switch(channel->request_state){
case SSH_CHANNEL_REQ_STATE_ERROR:
case SSH_CHANNEL_REQ_STATE_PENDING:
case SSH_CHANNEL_REQ_STATE_NONE:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
return SSH_ERROR;
case SSH_CHANNEL_REQ_STATE_ACCEPTED:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
ssh_log(session, SSH_LOG_RARE, "PTY: Success");
return SSH_OK;
case SSH_CHANNEL_REQ_STATE_DENIED:
channel->request_state=SSH_CHANNEL_REQ_STATE_NONE;
ssh_set_error(session, SSH_REQUEST_DENIED,
"Server denied PTY allocation");
ssh_log(session, SSH_LOG_RARE, "PTY: denied\n");
return SSH_ERROR;
}
// Not reached
return SSH_ERROR;
}