Method authenticate

src/FTPClientWrapperSSH.cpp:496–566

}

int FTPClientWrapperSSH::authenticate(ssh_session session) {
	int methods = 0;
	int authres = 0;
	int retries = 0;
	const int maxRetries = 5;

	authres = ssh_userauth_none(session, NULL);
	if (authres == SSH_AUTH_AGAIN)
		authres = ssh_userauth_none(session, NULL);
	if (authres == SSH_AUTH_ERROR) {
		OutErr("[SFTP] Error during authentication: %s", ssh_get_error(session));
		return -1;
	} else if (authres == SSH_AUTH_SUCCESS) {
		OutMsg("[SFTP] Authenticated without credentials.");
		return 0;
	}

	char * banner = ssh_get_issue_banner(session);
	if (banner) {
		OutMsg("[SFTP] Banner: %s\n", banner);
		ssh_string_free_char(banner);
	}

	do {
		methods = ssh_auth_list(session);
		if (methods == -1) {
			OutErr("[SFTP] No authentication methods provided.");
			return -1;
		}

		if (methods == SSH_AUTH_METHOD_UNKNOWN) {
			OutErr("[SFTP] Unknown authentication method.");
			return -1;
		}

		//Filter out methods client does not wish to use
		methods &= m_acceptedMethods;

		if ((authres == SSH_AUTH_DENIED || authres == SSH_AUTH_PARTIAL) && (methods & SSH_AUTH_METHOD_PUBLICKEY)) {
			authres = authenticate_key(session);
		}

		if ((authres == SSH_AUTH_DENIED || authres == SSH_AUTH_PARTIAL) && (methods & SSH_AUTH_METHOD_INTERACTIVE)) {
			authres = authenticate_kbinteractive(session);
		}

		if ((authres == SSH_AUTH_DENIED || authres == SSH_AUTH_PARTIAL) && (methods & SSH_AUTH_METHOD_PASSWORD)) {
			authres = authenticate_password(session);
		}

		if (methods == 0) {
			OutErr("[SFTP] None of the server's authentication methods were accepted. Please check the options under the authentication tab.");
			return -1;
		}

		if (authres == SSH_AUTH_ERROR) {
			OutErr("[SFTP] Error during authentication: %s", ssh_get_error(session));
			return -1;