Ejemplo n.º 1
0
static int
pop3_proxy_continue_sasl_auth(struct client *client, struct ostream *output,
			      const char *line)
{
	string_t *str;
	const unsigned char *data;
	size_t data_len;
	const char *error;
	int ret;

	str = t_str_new(128);
	if (base64_decode(line, strlen(line), NULL, str) < 0) {
		client_log_err(client, "proxy: Server sent invalid base64 data in AUTH response");
		return -1;
	}
	ret = dsasl_client_input(client->proxy_sasl_client,
				 str_data(str), str_len(str), &error);
	if (ret == 0) {
		ret = dsasl_client_output(client->proxy_sasl_client,
					  &data, &data_len, &error);
	}
	if (ret < 0) {
		client_log_err(client, t_strdup_printf(
			"proxy: Server sent invalid authentication data: %s",
			error));
		return -1;
	}
	i_assert(ret == 0);

	str_truncate(str, 0);
	base64_encode(data, data_len, str);
	str_append(str, "\r\n");

	o_stream_nsend(output, str_data(str), str_len(str));
	return 0;
}
Ejemplo n.º 2
0
int imap_proxy_parse_line(struct client *client, const char *line)
{
	struct imap_client *imap_client = (struct imap_client *)client;
	struct ostream *output;
	string_t *str;
	const unsigned char *data;
	unsigned int data_len;
	const char *error;
	int ret;

	i_assert(!client->destroyed);

	output = login_proxy_get_ostream(client->login_proxy);
	if (!imap_client->proxy_seen_banner) {
		/* this is a banner */
		client->proxy_state = IMAP_PROXY_STATE_BANNER;
		imap_client->proxy_seen_banner = TRUE;
		if (proxy_input_banner(imap_client, output, line) < 0) {
			client_proxy_failed(client, TRUE);
			return -1;
		}
		return 0;
	} else if (*line == '+') {
		/* AUTHENTICATE started. finish it. */
		if (client->proxy_sasl_client == NULL) {
			/* used literals with LOGIN command, just ignore. */
			return 0;
		}
		client->proxy_state = IMAP_PROXY_STATE_AUTH_CONTINUE;

		str = t_str_new(128);
		if (line[1] != ' ' ||
		    base64_decode(line+2, strlen(line+2), NULL, str) < 0) {
			client_log_err(client,
				"proxy: Server sent invalid base64 data in AUTHENTICATE response");
			client_proxy_failed(client, TRUE);
			return -1;
		}
		ret = dsasl_client_input(client->proxy_sasl_client,
					 str_data(str), str_len(str), &error);
		if (ret == 0) {
			ret = dsasl_client_output(client->proxy_sasl_client,
						  &data, &data_len, &error);
		}
		if (ret < 0) {
			client_log_err(client, t_strdup_printf(
				"proxy: Server sent invalid authentication data: %s",
				error));
			client_proxy_failed(client, TRUE);
			return -1;
		}
		i_assert(ret == 0);

		str_truncate(str, 0);
		base64_encode(data, data_len, str);
		str_append(str, "\r\n");

		o_stream_nsend(output, str_data(str), str_len(str));
		return 0;
	} else if (strncmp(line, "S ", 2) == 0) {
		if (strncmp(line, "S OK ", 5) != 0) {
			/* STARTTLS failed */
			client_log_err(client, t_strdup_printf(
				"proxy: Remote STARTTLS failed: %s",
				str_sanitize(line + 5, 160)));
			client_proxy_failed(client, TRUE);
			return -1;
		}
		/* STARTTLS successful, begin TLS negotiation. */
		client->proxy_state = IMAP_PROXY_STATE_STARTTLS;
		if (login_proxy_starttls(client->login_proxy) < 0) {
			client_proxy_failed(client, TRUE);
			return -1;
		}
		/* i/ostreams changed. */
		output = login_proxy_get_ostream(client->login_proxy);
		str = t_str_new(128);
		if (proxy_write_login(imap_client, str) < 0) {
			client_proxy_failed(client, TRUE);
			return -1;
		}
		o_stream_nsend(output, str_data(str), str_len(str));
		return 1;
	} else if (strncmp(line, "L OK ", 5) == 0) {
		/* Login successful. Send this line to client. */
		client->proxy_state = IMAP_PROXY_STATE_LOGIN;
		str = t_str_new(128);
		client_send_login_reply(imap_client, str, line + 5);
		o_stream_nsend(client->output, str_data(str), str_len(str));

		(void)client_skip_line(imap_client);
		client_proxy_finish_destroy_client(client);
		return 1;
	} else if (strncmp(line, "L ", 2) == 0) {
		line += 2;
		if (client->set->auth_verbose) {
			const char *log_line = line;

			if (strncasecmp(log_line, "NO ", 3) == 0)
				log_line += 3;
			client_proxy_log_failure(client, log_line);
		}
#define STR_NO_IMAP_RESP_CODE_AUTHFAILED "NO ["IMAP_RESP_CODE_AUTHFAILED"]"
		if (strncmp(line, STR_NO_IMAP_RESP_CODE_AUTHFAILED,
			    strlen(STR_NO_IMAP_RESP_CODE_AUTHFAILED)) == 0) {
			/* the remote sent a generic "authentication failed"
			   error. replace it with our one, so that in case
			   the remote is sending a different error message
			   an attacker can't find out what users exist in
			   the system. */
			client_send_reply_code(client, IMAP_CMD_REPLY_NO,
					       IMAP_RESP_CODE_AUTHFAILED,
					       AUTH_FAILED_MSG);
		} else if (strncmp(line, "NO [", 4) == 0) {
			/* remote sent some other resp-code. forward it. */
			client_send_raw(client, t_strconcat(
				imap_client->cmd_tag, " ", line, "\r\n", NULL));
		} else {
			/* there was no [resp-code], so remote isn't Dovecot
			   v1.2+. we could either forward the line as-is and
			   leak information about what users exist in this
			   system, or we could hide other errors than password
			   failures. since other errors are pretty rare,
			   it's safer to just hide them. they're still
			   available in logs though. */
			client_send_reply_code(client, IMAP_CMD_REPLY_NO,
					       IMAP_RESP_CODE_AUTHFAILED,
					       AUTH_FAILED_MSG);
		}

		client->proxy_auth_failed = TRUE;
		client_proxy_failed(client, FALSE);
		return -1;
	} else if (strncasecmp(line, "* CAPABILITY ", 13) == 0) {
		i_free(imap_client->proxy_backend_capability);
		imap_client->proxy_backend_capability = i_strdup(line + 13);
		return 0;
	} else if (strncmp(line, "C ", 2) == 0) {
		/* Reply to CAPABILITY command we sent */
		client->proxy_state = IMAP_PROXY_STATE_CAPABILITY;
		if (strncmp(line, "C OK ", 5) == 0 &&
		    client->proxy_password != NULL) {
			/* pipelining was disabled, send the login now. */
			str = t_str_new(128);
			if (proxy_write_login(imap_client, str) < 0)
				return -1;
			o_stream_nsend(output, str_data(str), str_len(str));
			return 1;
		}
		return 0;
	} else if (strncasecmp(line, "I ", 2) == 0) {
		/* Reply to ID command we sent, ignore it unless
		   pipelining is disabled, in which case send
		   either STARTTLS or login */
		client->proxy_state = IMAP_PROXY_STATE_ID;

		if (client->proxy_nopipelining) {
			str = t_str_new(128);
			if ((ret = proxy_write_starttls(imap_client, str)) < 0) {
				return -1;
			} else if (ret == 0) {
				if (proxy_write_login(imap_client, str) < 0)
					return -1;
			}
			o_stream_nsend(output, str_data(str), str_len(str));
			return 1;
		}
		return 0;
	} else if (strncasecmp(line, "* ID ", 5) == 0) {
		/* Reply to ID command we sent, ignore it */
		return 0;
	} else if (strncmp(line, "* ", 2) == 0) {
		/* untagged reply. just forward it. */
		client_send_raw(client, t_strconcat(line, "\r\n", NULL));
		return 0;
	} else {
		/* tagged reply, shouldn't happen. */
		client_log_err(client, t_strdup_printf(
			"proxy: Unexpected input, ignoring: %s",
			str_sanitize(line, 160)));
		return 0;
	}
}