static void channel_rcv_change_window(SSH_SESSION *session) {
CHANNEL *channel;
u32 bytes;
int rc;
enter_function();
channel = channel_from_msg(session);
if (channel == NULL) {
ssh_log(session, SSH_LOG_FUNCTIONS, ssh_get_error(session));
}
rc = buffer_get_u32(session->in_buffer, &bytes);
if (channel == NULL || rc != sizeof(u32)) {
ssh_log(session, SSH_LOG_PACKET,
"Error getting a window adjust message: invalid packet");
leave_function();
return;
}
bytes = ntohl(bytes);
ssh_log(session, SSH_LOG_PROTOCOL,
"Adding %d bytes to channel (%d:%d) (from %d bytes)",
bytes,
channel->local_channel,
channel->remote_channel,
channel->remote_window);
channel->remote_window += bytes;
leave_function();
}
static int kbdauth_info_get(SSH_SESSION *session){
STRING *name; /* name of the "asking" window showed to client */
STRING *instruction;
STRING *tmp;
u32 nprompts;
u32 i;
enter_function();
name=buffer_get_ssh_string(session->in_buffer);
instruction=buffer_get_ssh_string(session->in_buffer);
tmp=buffer_get_ssh_string(session->in_buffer);
buffer_get_u32(session->in_buffer,&nprompts);
if(!name || !instruction || !tmp){
if(name)
free(name);
if(instruction)
free(instruction);
// tmp must be empty if we got here
ssh_set_error(session,SSH_FATAL,"Invalid USERAUTH_INFO_REQUEST msg");
leave_function();
return SSH_AUTH_ERROR;
}
if(tmp)
free(tmp); // no use
if(!session->kbdint)
session->kbdint=kbdint_new();
else
kbdint_clean(session->kbdint);
session->kbdint->name=string_to_char(name);
free(name);
session->kbdint->instruction=string_to_char(instruction);
free(instruction);
nprompts=ntohl(nprompts);
if(nprompts>KBDINT_MAX_PROMPT){
ssh_set_error(session,SSH_FATAL,"Too much prompt asked from server: %lu(0x%.8lx)",nprompts,nprompts);
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->nprompts=nprompts;
session->kbdint->prompts=malloc(nprompts*sizeof(char *));
memset(session->kbdint->prompts,0,nprompts*sizeof(char *));
session->kbdint->echo=malloc(nprompts);
memset(session->kbdint->echo,0,nprompts);
for(i=0;i<nprompts;++i){
tmp=buffer_get_ssh_string(session->in_buffer);
buffer_get_u8(session->in_buffer,&session->kbdint->echo[i]);
if(!tmp){
ssh_set_error(session,SSH_FATAL,"Short INFO_REQUEST packet");
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->prompts[i]=string_to_char(tmp);
free(tmp);
}
leave_function();
return SSH_AUTH_INFO; /* we are not auth. but we parsed the packet */
}
/*
* Test the behavior of buffer_prepend_data
*/
static void torture_buffer_prepend(void **state) {
ssh_buffer buffer = *state;
uint32_t v;
buffer_add_data(buffer,"abcdef",6);
buffer_prepend_data(buffer,"xyz",3);
assert_int_equal(buffer_get_rest_len(buffer),9);
assert_int_equal(memcmp(buffer_get_rest(buffer), "xyzabcdef", 9), 0);
// Now remove 4 bytes and see if we can replace them
buffer_get_u32(buffer,&v);
assert_int_equal(buffer_get_rest_len(buffer),5);
assert_int_equal(memcmp(buffer_get_rest(buffer), "bcdef", 5), 0);
buffer_prepend_data(buffer,"aris",4);
assert_int_equal(buffer_get_rest_len(buffer),9);
assert_int_equal(memcmp(buffer_get_rest(buffer), "arisbcdef", 9), 0);
/* same thing but we add 5 bytes now */
buffer_get_u32(buffer,&v);
assert_int_equal(buffer_get_rest_len(buffer),5);
assert_int_equal(memcmp(buffer_get_rest(buffer), "bcdef", 5), 0);
buffer_prepend_data(buffer,"12345",5);
assert_int_equal(buffer_get_rest_len(buffer),10);
assert_int_equal(memcmp(buffer_get_rest(buffer), "12345bcdef", 10), 0);
}
static CHANNEL *channel_from_msg(SSH_SESSION *session) {
CHANNEL *channel;
u32 chan;
if (buffer_get_u32(session->in_buffer, &chan) != sizeof(u32)) {
ssh_set_error(session, SSH_FATAL,
"Getting channel from message: short read");
return NULL;
}
channel = ssh_channel_from_local(session, ntohl(chan));
if (channel == NULL) {
ssh_set_error(session, SSH_FATAL,
"Server specified invalid channel %lu",
(long unsigned int) ntohl(chan));
}
return channel;
}
static int channel_rcv_close1(ssh_session session) {
ssh_channel channel = session->channels;
uint32_t status;
buffer_get_u32(session->in_buffer, &status);
/*
* It's much more than a channel closing. spec says it's the last
* message sent by server (strange)
*/
/* actually status is lost somewhere */
channel->open = 0;
channel->remote_eof = 1;
if (buffer_add_u8(session->out_buffer, SSH_CMSG_EXIT_CONFIRMATION) < 0) {
return -1;
}
if (packet_send(session) != SSH_OK) {
return -1;
}
return 0;
}
int ssh_agent_get_ident_count(struct ssh_session_struct *session) {
ssh_buffer request = NULL;
ssh_buffer reply = NULL;
unsigned int type = 0;
unsigned int c1 = 0, c2 = 0;
uint32_t buf = 0;
switch (session->version) {
case 1:
c1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
c2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
break;
case 2:
c1 = SSH2_AGENTC_REQUEST_IDENTITIES;
c2 = SSH2_AGENT_IDENTITIES_ANSWER;
break;
default:
return 0;
}
/* send message to the agent requesting the list of identities */
request = ssh_buffer_new();
if (buffer_add_u8(request, c1) < 0) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
return -1;
}
reply = ssh_buffer_new();
if (reply == NULL) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
return -1;
}
if (agent_talk(session, request, reply) < 0) {
ssh_buffer_free(request);
return 0;
}
ssh_buffer_free(request);
/* get message type and verify the answer */
buffer_get_u8(reply, (uint8_t *) &type);
SSH_LOG(session, SSH_LOG_WARN,
"Answer type: %d, expected answer: %d",
type, c2);
if (agent_failed(type)) {
return 0;
} else if (type != c2) {
ssh_set_error(session, SSH_FATAL,
"Bad authentication reply message type: %d", type);
return -1;
}
buffer_get_u32(reply, &buf);
session->agent->count = agent_get_u32((uint8_t*)&buf);
SSH_LOG(session, SSH_LOG_DEBUG, "Agent count: %d",
session->agent->count);
if (session->agent->count > 1024) {
ssh_set_error(session, SSH_FATAL,
"Too many identities in authentication reply: %d",
session->agent->count);
ssh_buffer_free(reply);
return -1;
}
if (session->agent->ident) {
buffer_reinit(session->agent->ident);
}
session->agent->ident = reply;
return session->agent->count;
}
/**
* @internal
*
* @brief This function parses the last end of a channel request packet.
*
* This is normally converted to a SSH message and placed in the queue.
*
* @param[in] session The SSH session.
*
* @param[in] channel The channel the request is made on.
*
* @param[in] packet The rest of the packet to be parsed.
*
* @param[in] request The type of request.
*
* @param[in] want_reply The want_reply field from the request.
*
* @returns SSH_OK on success, SSH_ERROR if an error occured.
*/
int ssh_message_handle_channel_request(ssh_session session, ssh_channel channel, ssh_buffer packet,
const char *request, uint8_t want_reply) {
ssh_message msg = NULL;
enter_function();
msg = ssh_message_new(session);
if (msg == NULL) {
ssh_set_error_oom(session);
goto error;
}
ssh_log(session, SSH_LOG_PACKET,
"Received a %s channel_request for channel (%d:%d) (want_reply=%hhd)",
request, channel->local_channel, channel->remote_channel, want_reply);
msg->type = SSH_REQUEST_CHANNEL;
msg->channel_request.channel = channel;
msg->channel_request.want_reply = want_reply;
if (strcmp(request, "pty-req") == 0) {
ssh_string term = NULL;
char *term_c = NULL;
term = buffer_get_ssh_string(packet);
if (term == NULL) {
ssh_set_error_oom(session);
goto error;
}
term_c = ssh_string_to_char(term);
if (term_c == NULL) {
ssh_set_error_oom(session);
ssh_string_free(term);
goto error;
}
ssh_string_free(term);
msg->channel_request.type = SSH_CHANNEL_REQUEST_PTY;
msg->channel_request.TERM = term_c;
buffer_get_u32(packet, &msg->channel_request.width);
buffer_get_u32(packet, &msg->channel_request.height);
buffer_get_u32(packet, &msg->channel_request.pxwidth);
buffer_get_u32(packet, &msg->channel_request.pxheight);
msg->channel_request.width = ntohl(msg->channel_request.width);
msg->channel_request.height = ntohl(msg->channel_request.height);
msg->channel_request.pxwidth = ntohl(msg->channel_request.pxwidth);
msg->channel_request.pxheight = ntohl(msg->channel_request.pxheight);
msg->channel_request.modes = buffer_get_ssh_string(packet);
if (msg->channel_request.modes == NULL) {
SAFE_FREE(term_c);
goto error;
}
goto end;
}
if (strcmp(request, "window-change") == 0) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_WINDOW_CHANGE;
buffer_get_u32(packet, &msg->channel_request.width);
buffer_get_u32(packet, &msg->channel_request.height);
buffer_get_u32(packet, &msg->channel_request.pxwidth);
buffer_get_u32(packet, &msg->channel_request.pxheight);
msg->channel_request.width = ntohl(msg->channel_request.width);
msg->channel_request.height = ntohl(msg->channel_request.height);
msg->channel_request.pxwidth = ntohl(msg->channel_request.pxwidth);
msg->channel_request.pxheight = ntohl(msg->channel_request.pxheight);
goto end;
}
if (strcmp(request, "subsystem") == 0) {
ssh_string subsys = NULL;
char *subsys_c = NULL;
subsys = buffer_get_ssh_string(packet);
if (subsys == NULL) {
ssh_set_error_oom(session);
goto error;
}
subsys_c = ssh_string_to_char(subsys);
if (subsys_c == NULL) {
ssh_set_error_oom(session);
ssh_string_free(subsys);
goto error;
}
ssh_string_free(subsys);
msg->channel_request.type = SSH_CHANNEL_REQUEST_SUBSYSTEM;
msg->channel_request.subsystem = subsys_c;
goto end;
}
if (strcmp(request, "shell") == 0) {
msg->channel_request.type = SSH_CHANNEL_REQUEST_SHELL;
goto end;
}
if (strcmp(request, "exec") == 0) {
ssh_string cmd = NULL;
cmd = buffer_get_ssh_string(packet);
if (cmd == NULL) {
ssh_set_error_oom(session);
goto error;
}
msg->channel_request.type = SSH_CHANNEL_REQUEST_EXEC;
msg->channel_request.command = ssh_string_to_char(cmd);
ssh_string_free(cmd);
if (msg->channel_request.command == NULL) {
goto error;
}
goto end;
}
if (strcmp(request, "env") == 0) {
ssh_string name = NULL;
ssh_string value = NULL;
name = buffer_get_ssh_string(packet);
if (name == NULL) {
ssh_set_error_oom(session);
goto error;
}
value = buffer_get_ssh_string(packet);
if (value == NULL) {
ssh_set_error_oom(session);
ssh_string_free(name);
goto error;
}
msg->channel_request.type = SSH_CHANNEL_REQUEST_ENV;
msg->channel_request.var_name = ssh_string_to_char(name);
msg->channel_request.var_value = ssh_string_to_char(value);
if (msg->channel_request.var_name == NULL ||
msg->channel_request.var_value == NULL) {
ssh_string_free(name);
ssh_string_free(value);
goto error;
}
ssh_string_free(name);
ssh_string_free(value);
goto end;
}
if (strcmp(request, "x11-req") == 0) {
ssh_string auth_protocol = NULL;
ssh_string auth_cookie = NULL;
buffer_get_u8(packet, &msg->channel_request.x11_single_connection);
auth_protocol = buffer_get_ssh_string(packet);
if (auth_protocol == NULL) {
ssh_set_error_oom(session);
goto error;
}
auth_cookie = buffer_get_ssh_string(packet);
if (auth_cookie == NULL) {
ssh_set_error_oom(session);
ssh_string_free(auth_protocol);
goto error;
}
msg->channel_request.type = SSH_CHANNEL_REQUEST_X11;
msg->channel_request.x11_auth_protocol = ssh_string_to_char(auth_protocol);
msg->channel_request.x11_auth_cookie = ssh_string_to_char(auth_cookie);
if (msg->channel_request.x11_auth_protocol == NULL ||
msg->channel_request.x11_auth_cookie == NULL) {
ssh_string_free(auth_protocol);
ssh_string_free(auth_cookie);
goto error;
}
ssh_string_free(auth_protocol);
ssh_string_free(auth_cookie);
buffer_get_u32(packet, &msg->channel_request.x11_screen_number);
goto end;
}
msg->channel_request.type = SSH_CHANNEL_UNKNOWN;
end:
ssh_message_queue(session,msg);
leave_function();
return SSH_OK;
error:
ssh_message_free(msg);
leave_function();
return SSH_ERROR;
}
int ssh_get_kex1(SSH_SESSION *session) {
STRING *server_exp = NULL;
STRING *server_mod = NULL;
STRING *host_exp = NULL;
STRING *host_mod = NULL;
STRING *serverkey = NULL;
STRING *hostkey = NULL;
STRING *enc_session = NULL;
PUBLIC_KEY *srv = NULL;
PUBLIC_KEY *host = NULL;
u32 server_bits;
u32 host_bits;
u32 protocol_flags;
u32 supported_ciphers_mask;
u32 supported_authentications_mask;
u16 bits;
int rc = -1;
int ko;
enter_function();
ssh_log(session, SSH_LOG_PROTOCOL, "Waiting for a SSH_SMSG_PUBLIC_KEY");
if (packet_wait(session, SSH_SMSG_PUBLIC_KEY, 1) != SSH_OK) {
leave_function();
return -1;
}
ssh_log(session, SSH_LOG_PROTOCOL, "Got a SSH_SMSG_PUBLIC_KEY");
if (buffer_get_data(session->in_buffer, session->server_kex.cookie, 8) != 8) {
ssh_set_error(session, SSH_FATAL, "Can't get cookie in buffer");
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer, &server_bits);
server_exp = buffer_get_mpint(session->in_buffer);
if (server_exp == NULL) {
goto error;
}
server_mod = buffer_get_mpint(session->in_buffer);
if (server_mod == NULL) {
goto error;
}
buffer_get_u32(session->in_buffer, &host_bits);
host_exp = buffer_get_mpint(session->in_buffer);
if (host_exp == NULL) {
goto error;
}
host_mod = buffer_get_mpint(session->in_buffer);
if (host_mod == NULL) {
goto error;
}
buffer_get_u32(session->in_buffer, &protocol_flags);
buffer_get_u32(session->in_buffer, &supported_ciphers_mask);
ko = buffer_get_u32(session->in_buffer, &supported_authentications_mask);
if ((ko != sizeof(u32)) || !host_mod || !host_exp
|| !server_mod || !server_exp) {
ssh_log(session, 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(session, 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 (serverkey == 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;
}
session->next_crypto->server_pubkey = string_copy(hostkey);
if (session->next_crypto->server_pubkey == NULL) {
goto error;
}
session->next_crypto->server_pubkey_type = "ssh-rsa1";
/* now, we must choose an encryption algo */
/* hardcode 3des */
if (!(supported_ciphers_mask & (1 << SSH_CIPHER_3DES))) {
ssh_set_error(session, SSH_FATAL, "Remote server doesn't accept 3DES");
goto error;
}
ssh_log(session, SSH_LOG_PROTOCOL, "Sending SSH_CMSG_SESSION_KEY");
if (buffer_add_u8(session->out_buffer, SSH_CMSG_SESSION_KEY) < 0) {
goto error;
}
if (buffer_add_u8(session->out_buffer, SSH_CIPHER_3DES) < 0) {
goto error;
}
if (buffer_add_data(session->out_buffer, session->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 = string_len(enc_session) * 8 - 7;
ssh_log(session, SSH_LOG_PROTOCOL, "%d bits, %zu bytes encrypted session",
bits, string_len(enc_session));
bits = htons(bits);
/* the encrypted mpint */
if (buffer_add_data(session->out_buffer, &bits, sizeof(u16)) < 0) {
goto error;
}
if (buffer_add_data(session->out_buffer, enc_session->string,
string_len(enc_session)) < 0) {
goto error;
}
/* the protocol flags */
if (buffer_add_u32(session->out_buffer, 0) < 0) {
goto error;
}
if (packet_send(session) != SSH_OK) {
goto error;
}
/* we can set encryption */
if (crypt_set_algorithms(session)) {
goto error;
}
session->current_crypto = session->next_crypto;
session->next_crypto = NULL;
ssh_log(session, SSH_LOG_PROTOCOL, "Waiting for a SSH_SMSG_SUCCESS");
if (packet_wait(session,SSH_SMSG_SUCCESS,1) != SSH_OK) {
char buffer[1024] = {0};
snprintf(buffer, sizeof(buffer),
"Key exchange failed: %s", ssh_get_error(session));
ssh_set_error(session, SSH_FATAL, "%s",buffer);
goto error;
}
ssh_log(session, SSH_LOG_PROTOCOL, "received SSH_SMSG_SUCCESS\n");
rc = 0;
error:
string_free(host_mod);
string_free(host_exp);
string_free(server_mod);
string_free(server_exp);
string_free(serverkey);
string_free(hostkey);
publickey_free(srv);
publickey_free(host);
leave_function();
return rc;
}
static void channel_rcv_request(SSH_SESSION *session) {
CHANNEL *channel;
STRING *request_s;
char *request;
u32 status;
enter_function();
channel = channel_from_msg(session);
if (channel == NULL) {
ssh_log(session, SSH_LOG_FUNCTIONS, ssh_get_error(session));
leave_function();
return;
}
request_s = buffer_get_ssh_string(session->in_buffer);
if (request_s == NULL) {
ssh_log(session, SSH_LOG_PACKET, "Invalid MSG_CHANNEL_REQUEST");
leave_function();
return;
}
request = string_to_char(request_s);
string_free(request_s);
if (request == NULL) {
leave_function();
return;
}
buffer_get_u8(session->in_buffer, (u8 *) &status);
if (strcmp(request,"exit-status") == 0) {
SAFE_FREE(request);
ssh_log(session, SSH_LOG_PACKET, "received exit-status");
buffer_get_u32(session->in_buffer, &status);
channel->exit_status = ntohl(status);
leave_function();
return ;
}
if (strcmp(request, "exit-signal") == 0) {
const char *core = "(core dumped)";
STRING *signal_s;
char *signal;
u8 i;
SAFE_FREE(request);
signal_s = buffer_get_ssh_string(session->in_buffer);
if (signal_s == NULL) {
ssh_log(session, SSH_LOG_PACKET, "Invalid MSG_CHANNEL_REQUEST");
leave_function();
return;
}
signal = string_to_char(signal_s);
string_free(signal_s);
if (signal == NULL) {
leave_function();
return;
}
buffer_get_u8(session->in_buffer, &i);
if (i == 0) {
core = "";
}
ssh_log(session, SSH_LOG_PACKET,
"Remote connection closed by signal SIG %s %s", signal, core);
SAFE_FREE(signal);
leave_function();
return;
}
ssh_log(session, SSH_LOG_PACKET, "Unknown request %s", request);
SAFE_FREE(request);
leave_function();
}
/* is_stderr is set to 1 if the data are extended, ie stderr */
static void channel_rcv_data(SSH_SESSION *session,int is_stderr) {
CHANNEL *channel;
STRING *str;
size_t len;
enter_function();
channel = channel_from_msg(session);
if (channel == NULL) {
ssh_log(session, SSH_LOG_FUNCTIONS,
"%s", ssh_get_error(session));
leave_function();
return;
}
if (is_stderr) {
u32 ignore;
/* uint32 data type code. we can ignore it */
buffer_get_u32(session->in_buffer, &ignore);
}
str = buffer_get_ssh_string(session->in_buffer);
if (str == NULL) {
ssh_log(session, SSH_LOG_PACKET, "Invalid data packet!");
leave_function();
return;
}
len = string_len(str);
ssh_log(session, SSH_LOG_PROTOCOL,
"Channel receiving %zu bytes data in %d (local win=%d remote win=%d)",
len,
is_stderr,
channel->local_window,
channel->remote_window);
/* What shall we do in this case? Let's accept it anyway */
if (len > channel->local_window) {
ssh_log(session, SSH_LOG_RARE,
"Data packet too big for our window(%zu vs %d)",
len,
channel->local_window);
}
if (channel_default_bufferize(channel, str->string, len,
is_stderr) < 0) {
string_free(str);
leave_function();
return;
}
if (len <= channel->local_window) {
channel->local_window -= len;
} else {
channel->local_window = 0; /* buggy remote */
}
ssh_log(session, SSH_LOG_PROTOCOL,
"Channel windows are now (local win=%d remote win=%d)",
channel->local_window,
channel->remote_window);
string_free(str);
leave_function();
}
static int channel_open(CHANNEL *channel, const char *type_c, int window,
int maxpacket, BUFFER *payload) {
SSH_SESSION *session = channel->session;
STRING *type = NULL;
u32 tmp = 0;
enter_function();
channel->local_channel = ssh_channel_new_id(session);
channel->local_maxpacket = maxpacket;
channel->local_window = window;
ssh_log(session, SSH_LOG_RARE,
"Creating a channel %d with %d window and %d max packet",
channel->local_channel, window, maxpacket);
type = string_from_char(type_c);
if (type == NULL) {
leave_function();
return -1;
}
if (buffer_add_u8(session->out_buffer, SSH2_MSG_CHANNEL_OPEN) < 0 ||
buffer_add_ssh_string(session->out_buffer,type) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_channel)) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_window)) < 0 ||
buffer_add_u32(session->out_buffer, htonl(channel->local_maxpacket)) < 0) {
string_free(type);
leave_function();
return -1;
}
string_free(type);
if (payload != NULL) {
if (buffer_add_buffer(session->out_buffer, payload) < 0) {
leave_function();
return -1;
}
}
if (packet_send(session) != SSH_OK) {
leave_function();
return -1;
}
ssh_log(session, SSH_LOG_RARE,
"Sent a SSH_MSG_CHANNEL_OPEN type %s for channel %d",
type_c, channel->local_channel);
if (packet_wait(session, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, 1) != SSH_OK) {
leave_function();
return -1;
}
switch(session->in_packet.type) {
case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
buffer_get_u32(session->in_buffer, &tmp);
if (channel->local_channel != ntohl(tmp)) {
ssh_set_error(session, SSH_FATAL,
"Server answered with sender channel number %lu instead of given %u",
(long unsigned int) ntohl(tmp),
channel->local_channel);
leave_function();
return -1;
}
buffer_get_u32(session->in_buffer, &tmp);
channel->remote_channel = ntohl(tmp);
buffer_get_u32(session->in_buffer, &tmp);
channel->remote_window = ntohl(tmp);
buffer_get_u32(session->in_buffer,&tmp);
channel->remote_maxpacket=ntohl(tmp);
ssh_log(session, SSH_LOG_PROTOCOL,
"Received a CHANNEL_OPEN_CONFIRMATION for channel %d:%d",
channel->local_channel,
channel->remote_channel);
ssh_log(session, SSH_LOG_PROTOCOL,
"Remote window : %lu, maxpacket : %lu",
(long unsigned int) channel->remote_window,
(long unsigned int) channel->remote_maxpacket);
channel->open = 1;
leave_function();
return 0;
case SSH2_MSG_CHANNEL_OPEN_FAILURE:
{
STRING *error_s;
char *error;
u32 code;
buffer_get_u32(session->in_buffer, &tmp);
buffer_get_u32(session->in_buffer, &code);
error_s = buffer_get_ssh_string(session->in_buffer);
error = string_to_char(error_s);
string_free(error_s);
if (error == NULL) {
leave_function();
return -1;
}
ssh_set_error(session, SSH_REQUEST_DENIED,
"Channel opening failure: channel %u error (%lu) %s",
channel->local_channel,
(long unsigned int) ntohl(code),
error);
SAFE_FREE(error);
leave_function();
return -1;
}
default:
ssh_set_error(session, SSH_FATAL,
"Received unknown packet %d\n", session->in_packet.type);
leave_function();
return -1;
}
leave_function();
return -1;
}
SFTP_CLIENT_MESSAGE *sftp_get_client_message(SFTP_SESSION *sftp) {
SFTP_PACKET *packet=sftp_packet_read(sftp);
SFTP_CLIENT_MESSAGE *msg=malloc(sizeof (SFTP_CLIENT_MESSAGE));
BUFFER *payload;
STRING *tmp;
memset(msg,0,sizeof(SFTP_CLIENT_MESSAGE));
if(!packet)
return NULL;
payload=packet->payload;
ssh_say(2,"received sftp packet type %d\n",packet->type);
msg->type=packet->type;
msg->sftp=sftp;
buffer_get_u32(payload,&msg->id);
switch(msg->type) {
case SSH_FXP_CLOSE:
case SSH_FXP_READDIR:
msg->handle=buffer_get_ssh_string(payload);
break;
case SSH_FXP_READ:
msg->handle=buffer_get_ssh_string(payload);
buffer_get_u64(payload,&msg->offset);
buffer_get_u32(payload,&msg->len);
break;
case SSH_FXP_WRITE:
msg->handle=buffer_get_ssh_string(payload);
buffer_get_u64(payload,&msg->offset);
msg->data=buffer_get_ssh_string(payload);
break;
case SSH_FXP_REMOVE:
case SSH_FXP_RMDIR:
case SSH_FXP_OPENDIR:
case SSH_FXP_READLINK:
case SSH_FXP_REALPATH:
tmp=buffer_get_ssh_string(payload);
msg->filename=string_to_char(tmp);
free(tmp);
break;
case SSH_FXP_RENAME:
case SSH_FXP_SYMLINK:
tmp=buffer_get_ssh_string(payload);
msg->filename=string_to_char(tmp);
free(tmp);
msg->data=buffer_get_ssh_string(payload);
break;
case SSH_FXP_MKDIR:
case SSH_FXP_SETSTAT:
tmp=buffer_get_ssh_string(payload);
msg->filename=string_to_char(tmp);
free(tmp);
msg->attr=sftp_parse_attr(sftp, payload,0);
break;
case SSH_FXP_FSETSTAT:
msg->handle=buffer_get_ssh_string(payload);
msg->attr=sftp_parse_attr(sftp, payload,0);
break;
case SSH_FXP_LSTAT:
case SSH_FXP_STAT:
tmp=buffer_get_ssh_string(payload);
msg->filename=string_to_char(tmp);
free(tmp);
if(sftp->version >3)
buffer_get_u32(payload,&msg->flags);
break;
case SSH_FXP_OPEN:
tmp=buffer_get_ssh_string(payload);
msg->filename=string_to_char(tmp);
free(tmp);
buffer_get_u32(payload,&msg->flags);
msg->attr=sftp_parse_attr(sftp, payload,0);
case SSH_FXP_FSTAT:
msg->handle=buffer_get_ssh_string(payload);
buffer_get_u32(payload,&msg->flags);
break;
default:
printf("Received handled sftp message %d\n",msg->type);
}
msg->flags=ntohl(msg->flags);
msg->offset=ntohll(msg->offset);
msg->len=ntohl(msg->len);
sftp_packet_free(packet);
return msg;
}
void packet_parse(SSH_SESSION *session) {
STRING *error_s = NULL;
char *error = NULL;
int type = session->in_packet.type;
u32 tmp;
#ifdef HAVE_SSH1
if (session->version == 1) {
/* SSH-1 */
switch(type) {
case SSH_MSG_DISCONNECT:
ssh_log(session, SSH_LOG_PACKET, "Received SSH_MSG_DISCONNECT");
ssh_set_error(session, SSH_FATAL, "Received SSH_MSG_DISCONNECT");
ssh_socket_close(session->socket);
session->alive = 0;
return;
case SSH_SMSG_STDOUT_DATA:
case SSH_SMSG_STDERR_DATA:
case SSH_SMSG_EXITSTATUS:
channel_handle1(session,type);
return;
case SSH_MSG_DEBUG:
case SSH_MSG_IGNORE:
break;
default:
ssh_log(session, SSH_LOG_PACKET,
"Unexpected message code %d", type);
}
return;
} else {
#endif /* HAVE_SSH1 */
switch(type) {
case SSH2_MSG_DISCONNECT:
buffer_get_u32(session->in_buffer, &tmp);
error_s = buffer_get_ssh_string(session->in_buffer);
if (error_s == NULL) {
return;
}
error = string_to_char(error_s);
string_free(error_s);
if (error == NULL) {
return;
}
ssh_log(session, SSH_LOG_PACKET, "Received SSH_MSG_DISCONNECT\n");
ssh_set_error(session, SSH_FATAL,
"Received SSH_MSG_DISCONNECT: %s",error);
SAFE_FREE(error);
ssh_socket_close(session->socket);
session->alive = 0;
return;
case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
case SSH2_MSG_CHANNEL_DATA:
case SSH2_MSG_CHANNEL_EXTENDED_DATA:
case SSH2_MSG_CHANNEL_REQUEST:
case SSH2_MSG_CHANNEL_EOF:
case SSH2_MSG_CHANNEL_CLOSE:
channel_handle(session,type);
case SSH2_MSG_IGNORE:
case SSH2_MSG_DEBUG:
return;
default:
ssh_log(session, SSH_LOG_RARE, "Received unhandled packet %d", type);
}
#ifdef HAVE_SSH1
}
#endif
}
static int kbdauth_info_get(ssh_session session) {
ssh_string name; /* name of the "asking" window showed to client */
ssh_string instruction;
ssh_string tmp;
uint32_t nprompts;
uint32_t i;
enter_function();
name = buffer_get_ssh_string(session->in_buffer);
instruction = buffer_get_ssh_string(session->in_buffer);
tmp = buffer_get_ssh_string(session->in_buffer);
buffer_get_u32(session->in_buffer, &nprompts);
if (name == NULL || instruction == NULL || tmp == NULL) {
string_free(name);
string_free(instruction);
/* tmp if empty if we got here */
ssh_set_error(session, SSH_FATAL, "Invalid USERAUTH_INFO_REQUEST msg");
leave_function();
return SSH_AUTH_ERROR;
}
string_free(tmp);
if (session->kbdint == NULL) {
session->kbdint = kbdint_new();
if (session->kbdint == NULL) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
string_free(name);
string_free(instruction);
leave_function();
return SSH_AUTH_ERROR;
}
} else {
kbdint_clean(session->kbdint);
}
session->kbdint->name = string_to_char(name);
string_free(name);
if (session->kbdint->name == NULL) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
kbdint_free(session->kbdint);
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->instruction = string_to_char(instruction);
string_free(instruction);
if (session->kbdint->instruction == NULL) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
nprompts = ntohl(nprompts);
if (nprompts > KBDINT_MAX_PROMPT) {
ssh_set_error(session, SSH_FATAL,
"Too much prompt asked from server: %u (0x%.4x)",
nprompts, nprompts);
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->nprompts = nprompts;
session->kbdint->prompts = malloc(nprompts * sizeof(char *));
if (session->kbdint->prompts == NULL) {
session->kbdint->nprompts = 0;
ssh_set_error(session, SSH_FATAL, "No space left");
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
memset(session->kbdint->prompts, 0, nprompts * sizeof(char *));
session->kbdint->echo = malloc(nprompts);
if (session->kbdint->echo == NULL) {
session->kbdint->nprompts = 0;
ssh_set_error(session, SSH_FATAL, "No space left");
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
memset(session->kbdint->echo, 0, nprompts);
for (i = 0; i < nprompts; i++) {
tmp = buffer_get_ssh_string(session->in_buffer);
buffer_get_u8(session->in_buffer, &session->kbdint->echo[i]);
if (tmp == NULL) {
ssh_set_error(session, SSH_FATAL, "Short INFO_REQUEST packet");
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
session->kbdint->prompts[i] = string_to_char(tmp);
string_free(tmp);
if (session->kbdint->prompts[i] == NULL) {
ssh_set_error(session, SSH_FATAL, "Not enough space");
kbdint_free(session->kbdint);
session->kbdint = NULL;
leave_function();
return SSH_AUTH_ERROR;
}
}
leave_function();
return SSH_AUTH_INFO; /* we are not auth. but we parsed the packet */
}
int ssh_get_kex1(SSH_SESSION *session){
u32 server_bits, host_bits, protocol_flags,
supported_ciphers_mask, supported_authentications_mask;
STRING *server_exp=NULL;
STRING *server_mod=NULL;
STRING *host_exp=NULL;
STRING *host_mod=NULL;
STRING *serverkey;
STRING *hostkey;
STRING *enc_session;
PUBLIC_KEY *svr,*host;
int ko;
u16 bits;
ssh_say(3,"Waiting for a SSH_SMSG_PUBLIC_KEY\n");
if(packet_wait(session,SSH_SMSG_PUBLIC_KEY,1)){
return -1;
}
ssh_say(3,"Got a SSH_SMSG_PUBLIC_KEY\n");
if(buffer_get_data(session->in_buffer,session->server_kex.cookie,8)!=8){
ssh_set_error(NULL,SSH_FATAL,"Can't get cookie in buffer");
return -1;
}
buffer_get_u32(session->in_buffer,&server_bits);
server_exp=buffer_get_mpint(session->in_buffer);
server_mod=buffer_get_mpint(session->in_buffer);
buffer_get_u32(session->in_buffer,&host_bits);
host_exp=buffer_get_mpint(session->in_buffer);
host_mod=buffer_get_mpint(session->in_buffer);
buffer_get_u32(session->in_buffer,&protocol_flags);
buffer_get_u32(session->in_buffer,&supported_ciphers_mask);
ko=buffer_get_u32(session->in_buffer,&supported_authentications_mask);
if((ko!=sizeof(u32)) || !host_mod || !host_exp || !server_mod || !server_exp){
ssh_say(2,"Invalid SSH_SMSG_PUBLIC_KEY packet\n");
ssh_set_error(NULL,SSH_FATAL,"Invalid SSH_SMSG_PUBLIC_KEY packet");
if(host_mod)
free(host_mod);
if(host_exp)
free(host_exp);
if(server_mod)
free(server_mod);
if(server_exp)
free(server_exp);
return -1;
}
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_say(1,"server bits: %d ; host bits: %d\nProtocol flags : %.8lx ; "
"cipher mask : %.8lx ; auth mask: %.8lx\n",server_bits,
host_bits,protocol_flags,supported_ciphers_mask,
supported_authentications_mask);
serverkey=make_rsa1_string(server_exp,server_mod);
hostkey=make_rsa1_string(host_exp,host_mod);
build_session_id1(session,server_mod,host_mod);
free(server_exp);
free(server_mod);
free(host_exp);
free(host_mod);
svr=publickey_from_string(serverkey);
host=publickey_from_string(hostkey);
session->next_crypto->server_pubkey=string_copy(hostkey);
session->next_crypto->server_pubkey_type="ssh-rsa1";
/* now, we must choose an encryption algo */
/* hardcode 3des */
if(!(supported_ciphers_mask & (1<<SSH_CIPHER_3DES))){
ssh_set_error(NULL,SSH_FATAL,"Remote server doesn't accept 3des");
return -1;
}
packet_clear_out(session);
buffer_add_u8(session->out_buffer,SSH_CMSG_SESSION_KEY);
buffer_add_u8(session->out_buffer,SSH_CIPHER_3DES);
buffer_add_data(session->out_buffer,session->server_kex.cookie,8);
enc_session=encrypt_session_key(session,svr,host,server_bits, host_bits);
bits=string_len(enc_session)*8 - 7;
ssh_say(2,"%d bits,%d bytes encrypted session\n",bits,string_len(enc_session));
bits=htons(bits);
/* the encrypted mpint */
buffer_add_data(session->out_buffer,&bits,sizeof(u16));
buffer_add_data(session->out_buffer,enc_session->string,
string_len(enc_session));
/* the protocol flags */
buffer_add_u32(session->out_buffer,0);
packet_send(session);
/* we can set encryption */
if(crypt_set_algorithms(session))
return -1;
session->current_crypto=session->next_crypto;
session->next_crypto=NULL;
if(packet_wait(session,SSH_SMSG_SUCCESS,1)){
char buffer[1024];
snprintf(buffer,sizeof(buffer),"Key exchange failed : %s",ssh_get_error(session));
ssh_set_error(session,SSH_FATAL,"%s",buffer);
return -1;
}
ssh_say(1,"received SSH_SMSG_SUCCESS\n");
return 0;
}
