GUAC-780: Init OpenSSL for sake of threads.
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@ -268,6 +268,55 @@ static LIBSSH2_SESSION* __guac_ssh_create_session(guac_client* client,
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GCRY_THREAD_OPTION_PTHREAD_IMPL;
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#endif
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/**
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* Array of mutexes, used by OpenSSL.
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*/
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static pthread_mutex_t* __openssl_locks;
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/**
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* Called by OpenSSL when locking or unlocking the Nth mutex.
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*/
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static void __openssl_locking_callback(int mode, int n, const char* file, int line){
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if (mode & CRYPTO_LOCK)
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pthread_mutex_lock(&(__openssl_locks[n]));
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else if (mode & CRYPTO_UNLOCK)
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pthread_mutex_unlock(&(__openssl_locks[n]));
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}
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/**
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* Called by OpenSSL when determining the current thread ID.
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*/
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static unsigned long __openssl_id_callback() {
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return (unsigned long) pthread_self();
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}
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/**
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* Creates the given number of mutexes, such that OpenSSL will have at least
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* this number of mutexes at its disposal.
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*/
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static void __openssl_init_locks(int count) {
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int i;
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__openssl_locks = malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
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for (i=0; i<count; i++)
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pthread_mutex_init(&(__openssl_locks[i]), NULL);
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}
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/**
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* Frees the given number of mutexes.
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*/
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static void __openssl_free_locks(int count) {
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int i;
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for (i=0; i<count; i++)
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pthread_mutex_destroy(&(__openssl_locks[i]));
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}
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void* ssh_client_thread(void* data) {
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guac_client* client = (guac_client*) data;
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@ -284,6 +333,7 @@ void* ssh_client_thread(void* data) {
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pthread_t input_thread;
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#ifdef LIBSSH2_USES_GCRYPT
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/* Init threadsafety in libgcrypt */
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gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
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if (!gcry_check_version(GCRYPT_VERSION)) {
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guac_client_log_error(client, "libgcrypt version mismatch.");
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@ -291,6 +341,11 @@ void* ssh_client_thread(void* data) {
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}
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#endif
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/* Init threadsafety in OpenSSL */
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__openssl_init_locks(CRYPTO_num_locks());
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CRYPTO_set_id_callback(__openssl_id_callback);
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CRYPTO_set_locking_callback(__openssl_locking_callback);
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SSL_library_init();
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libssh2_init(0);
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@ -484,6 +539,7 @@ void* ssh_client_thread(void* data) {
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guac_client_stop(client);
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pthread_join(input_thread, NULL);
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__openssl_free_locks(CRYPTO_num_locks());
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guac_client_log_info(client, "SSH connection ended.");
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return NULL;
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