GUAC-1264: Require explicit free for users and sessions. Ensure SSH client data is zeroed upon allocation.
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@ -707,8 +707,5 @@ void guac_common_ssh_destroy_sftp_filesystem(guac_object* filesystem) {
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/* Clean up the SFTP filesystem object */
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guac_client_free_object(sftp_data->ssh_session->client, filesystem);
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/* Disconnect SSH session corresponding to the SFTP session */
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guac_common_ssh_destroy_session(sftp_data->ssh_session);
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}
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@ -110,7 +110,8 @@ guac_object* guac_common_ssh_create_sftp_filesystem(
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/**
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* Destroys the given filesystem object, disconnecting from SFTP and freeing
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* and associated resources.
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* and associated resources. Any associated session or user objects must be
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* explicitly destroyed.
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*
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* @param object
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* The filesystem object to destroy.
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@ -504,10 +504,6 @@ void guac_common_ssh_destroy_session(guac_common_ssh_session* session) {
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libssh2_session_disconnect(session->session, "Bye");
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libssh2_session_free(session->session);
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/* Destroy associated user */
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if (session->user)
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guac_common_ssh_destroy_user(session->user);
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/* Free all other data */
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free(session);
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@ -80,6 +80,9 @@ void guac_common_ssh_uninit();
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* Connects to the SSH server running at the given hostname and port, and
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* authenticates as the given user. If an error occurs while connecting or
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* authenticating, the Guacamole client will automatically and fatally abort.
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* The user object provided must eventually be explicitly destroyed, but should
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* not be destroyed until this session is destroyed, assuming the session is
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* successfully created.
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*
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* @param client
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* The Guacamole client that will be using SSH.
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@ -91,8 +94,7 @@ void guac_common_ssh_uninit();
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* The port to connect to on the given hostname.
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*
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* @param user
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* The user to authenticate as, once connected. This user will be
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* automatically destroyed when this session is destroyed.
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* The user to authenticate as, once connected.
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*
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* @return
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* A new SSH session if the connection and authentication succeed, or NULL
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@ -103,7 +105,8 @@ guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
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/**
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* Disconnects and destroys the given SSH session, freeing all associated
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* resources.
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* resources. Any associated user must be explicitly destroyed, and will not
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* be destroyed automatically.
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*
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* @param session
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* The SSH session to destroy.
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@ -120,11 +120,10 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
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guac_socket* socket = client->socket;
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ssh_guac_client_data* client_data = malloc(sizeof(ssh_guac_client_data));
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ssh_guac_client_data* client_data = calloc(1, sizeof(ssh_guac_client_data));
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/* Init client data */
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client->data = client_data;
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client_data->term_channel = NULL;
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if (argc != SSH_ARGS_COUNT) {
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guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Wrong number of arguments");
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@ -159,7 +158,6 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
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/* Parse SFTP enable */
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client_data->enable_sftp = strcmp(argv[IDX_ENABLE_SFTP], "true") == 0;
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client_data->sftp_filesystem = NULL;
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#ifdef ENABLE_SSH_AGENT
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client_data->enable_agent = strcmp(argv[IDX_ENABLE_AGENT], "true") == 0;
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@ -27,6 +27,7 @@
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#include "config.h"
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#include "guac_ssh.h"
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#include "guac_ssh_user.h"
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#include "sftp.h"
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#include "terminal.h"
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@ -109,11 +110,21 @@ typedef struct ssh_guac_client_data {
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*/
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pthread_t client_thread;
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/**
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* The user and credentials to use for all SSH sessions.
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*/
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guac_common_ssh_user* user;
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/**
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* SSH session, used by the SSH client thread.
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*/
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guac_common_ssh_session* session;
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/**
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* SFTP session, used by the SFTP client/filesystem.
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*/
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guac_common_ssh_session* sftp_session;
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/**
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* The filesystem object exposed for the SFTP session.
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*/
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@ -102,14 +102,20 @@ int ssh_guac_client_free_handler(guac_client* client) {
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/* Free channels */
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libssh2_channel_free(guac_client_data->term_channel);
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/* Clean up the SFTP filesystem object */
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if (guac_client_data->sftp_filesystem)
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/* Clean up the SFTP filesystem object and session */
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if (guac_client_data->sftp_filesystem) {
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guac_common_ssh_destroy_sftp_filesystem(guac_client_data->sftp_filesystem);
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guac_common_ssh_destroy_session(guac_client_data->sftp_session);
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}
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/* Free session */
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if (guac_client_data->session != NULL)
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guac_common_ssh_destroy_session(guac_client_data->session);
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/* Free user */
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if (guac_client_data->user != NULL)
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guac_common_ssh_destroy_user(guac_client_data->user);
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/* Free generic data struct */
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free(client->data);
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@ -130,12 +130,16 @@ static guac_common_ssh_user* guac_ssh_get_user(guac_client* client) {
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} /* end if key given */
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/* Otherwise, get password if not provided */
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else if (client_data->password[0] == 0) {
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/* Otherwise, use password */
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else {
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guac_terminal_prompt(client_data->term, "Password: ",
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client_data->password, sizeof(client_data->password), false);
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/* Get password if not provided */
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if (client_data->password[0] == 0)
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guac_terminal_prompt(client_data->term, "Password: ",
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client_data->password, sizeof(client_data->password),
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false);
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/* Set provided password */
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guac_common_ssh_user_set_password(user, client_data->password);
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}
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@ -181,7 +185,7 @@ void* ssh_client_thread(void* data) {
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return NULL;
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/* Get user and credentials */
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guac_common_ssh_user* user = guac_ssh_get_user(client);
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client_data->user = guac_ssh_get_user(client);
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/* Send new name */
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char name[1024];
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@ -191,7 +195,7 @@ void* ssh_client_thread(void* data) {
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/* Open SSH session */
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client_data->session = guac_common_ssh_create_session(client,
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client_data->hostname, client_data->port, user);
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client_data->hostname, client_data->port, client_data->user);
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if (client_data->session == NULL) {
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/* Already aborted within guac_common_ssh_create_session() */
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return NULL;
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@ -229,17 +233,18 @@ void* ssh_client_thread(void* data) {
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/* Create SSH session specific for SFTP */
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guac_client_log(client, GUAC_LOG_DEBUG, "Reconnecting for SFTP...");
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guac_common_ssh_session* sftp_ssh_session =
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client_data->sftp_session =
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guac_common_ssh_create_session(client, client_data->hostname,
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client_data->port, user);
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if (sftp_ssh_session == NULL) {
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client_data->port, client_data->user);
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if (client_data->sftp_session == NULL) {
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/* Already aborted within guac_common_ssh_create_session() */
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return NULL;
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}
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/* Request SFTP */
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client_data->sftp_filesystem =
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guac_common_ssh_create_sftp_filesystem(sftp_ssh_session, "/");
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guac_common_ssh_create_sftp_filesystem(
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client_data->sftp_session, "/");
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/* Set generic (non-filesystem) file upload handler */
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client->file_handler = guac_sftp_file_handler;
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