static int channel_request_callback (ssh_session session, ssh_message message, gpointer user_data) { const gchar *cmd; /* wait for a shell */ switch (ssh_message_type (message)) { case SSH_REQUEST_CHANNEL: switch (ssh_message_subtype (message)) { case SSH_CHANNEL_REQUEST_SHELL: if (do_shell (state.event, state.channel) < 0) goto deny; goto accept_end; case SSH_CHANNEL_REQUEST_EXEC: cmd = ssh_message_channel_request_command (message); if (do_exec (state.event, state.channel, cmd) < 0) goto deny; goto accept_end; case SSH_CHANNEL_REQUEST_PTY: case SSH_CHANNEL_REQUEST_ENV: goto accept; default: g_message ("message subtype unknown: %d", ssh_message_subtype (message)); goto deny; } default: g_message ("message type unknown: %d", ssh_message_type (message)); goto deny; } deny: return 1; accept_end: accept: ssh_message_channel_request_reply_success (message); return 0; }
CHANNEL *recv_channel(SSH_SESSION *session){ CHANNEL *chan=NULL; SSH_MESSAGE *message; int sftp=0; do { message=ssh_message_get(session); if(message){ switch(ssh_message_type(message)){ case SSH_CHANNEL_REQUEST_OPEN: if(ssh_message_subtype(message)==SSH_CHANNEL_SESSION){ chan=ssh_message_channel_request_open_reply_accept(message); break; } default: ssh_message_reply_default(message); } ssh_message_free(message); } } while(message && !chan); if(!chan) return NULL; do { message=ssh_message_get(session); if(message && ssh_message_type(message)==SSH_CHANNEL_REQUEST && ssh_message_subtype(message)==SSH_CHANNEL_REQUEST_SUBSYSTEM){ if(!strcmp(ssh_message_channel_request_subsystem(message),"sftp")){ sftp=1; ssh_message_channel_request_reply_success(message); break; } } if(!sftp){ ssh_message_reply_default(message); } ssh_message_free(message); } while (message && !sftp); if(!message) return NULL; return chan; }
int main(int argc, char **argv){ ssh_session session; ssh_bind sshbind; ssh_message message; ssh_channel chan=0; char buf[2048]; int auth=0; int sftp=0; int i; int r; sshbind=ssh_bind_new(); session=ssh_new(); ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_DSAKEY, KEYS_FOLDER "ssh_host_dsa_key"); ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_RSAKEY, KEYS_FOLDER "ssh_host_rsa_key"); #ifdef HAVE_ARGP_H /* * Parse our arguments; every option seen by parse_opt will * be reflected in arguments. */ argp_parse (&argp, argc, argv, 0, 0, sshbind); #else (void) argc; (void) argv; #endif #ifdef WITH_PCAP set_pcap(session); #endif if(ssh_bind_listen(sshbind)<0){ printf("Error listening to socket: %s\n",ssh_get_error(sshbind)); return 1; } r=ssh_bind_accept(sshbind,session); if(r==SSH_ERROR){ printf("error accepting a connection : %s\n",ssh_get_error(sshbind)); return 1; } if (ssh_handle_key_exchange(session)) { printf("ssh_handle_key_exchange: %s\n", ssh_get_error(session)); return 1; } do { message=ssh_message_get(session); if(!message) break; switch(ssh_message_type(message)){ case SSH_REQUEST_AUTH: switch(ssh_message_subtype(message)){ case SSH_AUTH_METHOD_PASSWORD: printf("User %s wants to auth with pass %s\n", ssh_message_auth_user(message), ssh_message_auth_password(message)); if(auth_password(ssh_message_auth_user(message), ssh_message_auth_password(message))){ auth=1; ssh_message_auth_reply_success(message,0); break; } // not authenticated, send default message case SSH_AUTH_METHOD_NONE: default: ssh_message_auth_set_methods(message,SSH_AUTH_METHOD_PASSWORD); ssh_message_reply_default(message); break; } break; default: ssh_message_reply_default(message); } ssh_message_free(message); } while (!auth); if(!auth){ printf("auth error: %s\n",ssh_get_error(session)); ssh_disconnect(session); return 1; } do { message=ssh_message_get(session); if(message){ switch(ssh_message_type(message)){ case SSH_REQUEST_CHANNEL_OPEN: if(ssh_message_subtype(message)==SSH_CHANNEL_SESSION){ chan=ssh_message_channel_request_open_reply_accept(message); break; } default: ssh_message_reply_default(message); } ssh_message_free(message); } } while(message && !chan); if(!chan){ printf("error : %s\n",ssh_get_error(session)); ssh_finalize(); return 1; } do { message=ssh_message_get(session); if(message && ssh_message_type(message)==SSH_REQUEST_CHANNEL && ssh_message_subtype(message)==SSH_CHANNEL_REQUEST_SHELL){ // if(!strcmp(ssh_message_channel_request_subsystem(message),"sftp")){ sftp=1; ssh_message_channel_request_reply_success(message); break; // } } if(!sftp){ ssh_message_reply_default(message); } ssh_message_free(message); } while (message && !sftp); if(!sftp){ printf("error : %s\n",ssh_get_error(session)); return 1; } printf("it works !\n"); do{ i=ssh_channel_read(chan,buf, 2048, 0); if(i>0) { ssh_channel_write(chan, buf, i); if (write(1,buf,i) < 0) { printf("error writing to buffer\n"); return 1; } } } while (i>0); ssh_disconnect(session); ssh_bind_free(sshbind); #ifdef WITH_PCAP cleanup_pcap(); #endif ssh_finalize(); return 0; }
int main(int argc, char **argv){ ssh_session session; ssh_bind sshbind; ssh_message message; ssh_channel chan=0; char buf[2048]; int auth=0; int shell=0; int i; int r; sshbind=ssh_bind_new(); session=ssh_new(); ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_DSAKEY, KEYS_FOLDER "ssh_host_dsa_key"); ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_RSAKEY, KEYS_FOLDER "ssh_host_rsa_key"); #ifdef HAVE_ARGP_H /* * Parse our arguments; every option seen by parse_opt will * be reflected in arguments. */ argp_parse (&argp, argc, argv, 0, 0, sshbind); #else (void) argc; (void) argv; #endif #ifdef WITH_PCAP set_pcap(session); #endif if(ssh_bind_listen(sshbind)<0){ printf("Error listening to socket: %s\n", ssh_get_error(sshbind)); return 1; } printf("Started sample libssh sshd on port %d\n", port); printf("You can login as the user %s with the password %s\n", SSHD_USER, SSHD_PASSWORD); r = ssh_bind_accept(sshbind, session); if(r==SSH_ERROR){ printf("Error accepting a connection: %s\n", ssh_get_error(sshbind)); return 1; } if (ssh_handle_key_exchange(session)) { printf("ssh_handle_key_exchange: %s\n", ssh_get_error(session)); return 1; } /* proceed to authentication */ auth = authenticate(session); if (!auth || !authenticated) { printf("Authentication error: %s\n", ssh_get_error(session)); ssh_disconnect(session); return 1; } /* wait for a channel session */ do { message = ssh_message_get(session); if(message){ if(ssh_message_type(message) == SSH_REQUEST_CHANNEL_OPEN && ssh_message_subtype(message) == SSH_CHANNEL_SESSION) { chan = ssh_message_channel_request_open_reply_accept(message); ssh_message_free(message); break; } else { ssh_message_reply_default(message); ssh_message_free(message); } } else { break; } } while(!chan); if(!chan) { printf("Error: cleint did not ask for a channel session (%s)\n", ssh_get_error(session)); ssh_finalize(); return 1; } /* wait for a shell */ do { message = ssh_message_get(session); if(message != NULL) { if(ssh_message_type(message) == SSH_REQUEST_CHANNEL && ssh_message_subtype(message) == SSH_CHANNEL_REQUEST_SHELL) { shell = 1; ssh_message_channel_request_reply_success(message); ssh_message_free(message); break; } ssh_message_reply_default(message); ssh_message_free(message); } else { break; } } while(!shell); if(!shell) { printf("Error: No shell requested (%s)\n", ssh_get_error(session)); return 1; } printf("it works !\n"); do{ i=ssh_channel_read(chan,buf, 2048, 0); if(i>0) { if(*buf == '' || *buf == '') break; if(i == 1 && *buf == '\r') ssh_channel_write(chan, "\r\n", 2); else ssh_channel_write(chan, buf, i); if (write(1,buf,i) < 0) { printf("error writing to buffer\n"); return 1; } } } while (i>0); ssh_channel_close(chan); ssh_disconnect(session); ssh_bind_free(sshbind); #ifdef WITH_PCAP cleanup_pcap(); #endif ssh_finalize(); return 0; }
static int ssh_execute_server_request(ssh_session session, ssh_message msg) { ssh_channel channel = NULL; int rc; switch(msg->type) { case SSH_REQUEST_AUTH: if (msg->auth_request.method == SSH_AUTH_METHOD_PASSWORD && ssh_callbacks_exists(session->server_callbacks, auth_password_function)) { rc = session->server_callbacks->auth_password_function(session, msg->auth_request.username, msg->auth_request.password, session->server_callbacks->userdata); if (rc == SSH_AUTH_SUCCESS || rc == SSH_AUTH_PARTIAL) { ssh_message_auth_reply_success(msg, rc == SSH_AUTH_PARTIAL); } else { ssh_message_reply_default(msg); } return SSH_OK; } else if(msg->auth_request.method == SSH_AUTH_METHOD_PUBLICKEY && ssh_callbacks_exists(session->server_callbacks, auth_pubkey_function)) { rc = session->server_callbacks->auth_pubkey_function(session, msg->auth_request.username, msg->auth_request.pubkey, msg->auth_request.signature_state, session->server_callbacks->userdata); if (rc == SSH_AUTH_SUCCESS || rc == SSH_AUTH_PARTIAL){ ssh_message_auth_reply_success(msg, rc == SSH_AUTH_PARTIAL); } else { ssh_message_reply_default(msg); } return SSH_OK; } break; case SSH_REQUEST_CHANNEL_OPEN: if (msg->channel_request_open.type == SSH_CHANNEL_SESSION && ssh_callbacks_exists(session->server_callbacks, channel_open_request_session_function)) { channel = session->server_callbacks->channel_open_request_session_function(session, session->server_callbacks->userdata); if (channel != NULL) { rc = ssh_message_channel_request_open_reply_accept_channel(msg, channel); return SSH_OK; } else { ssh_message_reply_default(msg); } return SSH_OK; } break; case SSH_REQUEST_CHANNEL: channel = msg->channel_request.channel; if (msg->channel_request.type == SSH_CHANNEL_REQUEST_PTY && ssh_callbacks_exists(channel->callbacks, channel_pty_request_function)) { rc = channel->callbacks->channel_pty_request_function(session, channel, msg->channel_request.TERM, msg->channel_request.width, msg->channel_request.height, msg->channel_request.pxwidth, msg->channel_request.pxheight, channel->callbacks->userdata); if (rc == 0) { ssh_message_channel_request_reply_success(msg); } else { ssh_message_reply_default(msg); } return SSH_OK; } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_SHELL && ssh_callbacks_exists(channel->callbacks, channel_shell_request_function)) { rc = channel->callbacks->channel_shell_request_function(session, channel, channel->callbacks->userdata); if (rc == 0) { ssh_message_channel_request_reply_success(msg); } else { ssh_message_reply_default(msg); } return SSH_OK; } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_X11 && ssh_callbacks_exists(channel->callbacks, channel_x11_req_function)) { channel->callbacks->channel_x11_req_function(session, channel, msg->channel_request.x11_single_connection, msg->channel_request.x11_auth_protocol, msg->channel_request.x11_auth_cookie, msg->channel_request.x11_screen_number, channel->callbacks->userdata); ssh_message_channel_request_reply_success(msg); return SSH_OK; } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_WINDOW_CHANGE && ssh_callbacks_exists(channel->callbacks, channel_pty_window_change_function)) { rc = channel->callbacks->channel_pty_window_change_function(session, channel, msg->channel_request.height, msg->channel_request.width, msg->channel_request.pxheight, msg->channel_request.pxwidth, channel->callbacks->userdata); } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_EXEC && ssh_callbacks_exists(channel->callbacks, channel_exec_request_function)) { rc = channel->callbacks->channel_exec_request_function(session, channel, msg->channel_request.command, channel->callbacks->userdata); if (rc == 0) { ssh_message_channel_request_reply_success(msg); } else { ssh_message_reply_default(msg); } return SSH_OK; } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_ENV && ssh_callbacks_exists(channel->callbacks, channel_env_request_function)) { rc = channel->callbacks->channel_env_request_function(session, channel, msg->channel_request.var_name, msg->channel_request.var_value, channel->callbacks->userdata); if (rc == 0) { ssh_message_channel_request_reply_success(msg); } else { ssh_message_reply_default(msg); } return SSH_OK; } else if (msg->channel_request.type == SSH_CHANNEL_REQUEST_SUBSYSTEM && ssh_callbacks_exists(channel->callbacks, channel_subsystem_request_function)) { rc = channel->callbacks->channel_subsystem_request_function(session, channel, msg->channel_request.subsystem, channel->callbacks->userdata); if (rc == 0) { ssh_message_channel_request_reply_success(msg); } else { ssh_message_reply_default(msg); } return SSH_OK; } break; case SSH_REQUEST_SERVICE: if (ssh_callbacks_exists(session->server_callbacks, service_request_function)) { rc = session->server_callbacks->service_request_function(session, msg->service_request.service, session->server_callbacks->userdata); if (rc == 0) { ssh_message_reply_default(msg); } else { ssh_disconnect(session); } return SSH_OK; } return SSH_AGAIN; case SSH_REQUEST_GLOBAL: break; } return SSH_AGAIN; }