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The Microsoft Azure IoT Device SDK for Java
/*
* Copyright (c) Microsoft. All rights reserved.
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
package com.microsoft.azure.sdk.iot.device.hsm;
import com.microsoft.azure.sdk.iot.device.IotHubStatusCode;
import com.microsoft.azure.sdk.iot.device.transport.TransportException;
import com.microsoft.azure.sdk.iot.device.hsm.parser.ErrorResponse;
import com.microsoft.azure.sdk.iot.device.hsm.parser.SignRequest;
import com.microsoft.azure.sdk.iot.device.hsm.parser.SignResponse;
import com.microsoft.azure.sdk.iot.device.hsm.parser.TrustBundleResponse;
import com.microsoft.azure.sdk.iot.device.transport.https.HttpsMethod;
import com.microsoft.azure.sdk.iot.device.transport.https.HttpsRequest;
import com.microsoft.azure.sdk.iot.device.transport.https.HttpsResponse;
import lombok.extern.slf4j.Slf4j;
import java.io.*;
import java.net.*;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
@Slf4j
public class HttpsHsmClient
{
private final String baseUrl;
private final String scheme;
private final UnixDomainSocketChannel unixDomainSocketChannel;
private static final String HTTPS_SCHEME = "https";
private static final String HTTP_SCHEME = "http";
private static final String UNIX_SCHEME = "unix";
private static final String API_VERSION_QUERY_STRING_PREFIX = "api-version=";
/**
* Client object for sending sign requests to an HSM unit
* @param baseUrl The base url of the HSM
* @param unixDomainSocketChannel the implementation of the {@link UnixDomainSocketChannel} interface that will be used if any
* unix domain socket communication is required. May be null if no unix domain socket communication is required.
* @throws URISyntaxException if the provided base url cannot be converted to a URI
*/
public HttpsHsmClient(String baseUrl, UnixDomainSocketChannel unixDomainSocketChannel) throws URISyntaxException
{
if (baseUrl == null || baseUrl.isEmpty())
{
throw new IllegalArgumentException("baseUrl cannot be null");
}
log.trace("Creating HttpsHsmClient with base url {}", baseUrl);
this.baseUrl = baseUrl;
this.scheme = new URI(baseUrl).getScheme();
// unixDomainSocketChannel is allowed to be null since the module may not need to do unix domain socket communication during setup depending on the Edge environment.
this.unixDomainSocketChannel = unixDomainSocketChannel;
}
/**
* Send a sign request to the HSM using the provided parameters and return the HSM's response
* @param apiVersion the api version to use
* @param moduleName The name of the module for which the sign request is requesting access to
* @param signRequest the request to send
* @param generationId the generation id
* @return The response from the HSM
* @throws TransportException If there was a problem communicating with the HSM
*/
public SignResponse sign(String apiVersion, String moduleName, SignRequest signRequest, String generationId) throws TransportException, UnsupportedEncodingException
{
log.debug("Sending sign request...");
String uri = baseUrl != null ? baseUrl.replaceFirst("/*$", "") : "";
byte[] body = signRequest.toJson().getBytes(StandardCharsets.UTF_8);
String pathBuilder = "/modules/" + URLEncoder.encode(moduleName, StandardCharsets.UTF_8.name()) +
"/genid/" + URLEncoder.encode(generationId, StandardCharsets.UTF_8.name()) +
"/sign";
HttpsResponse response = null;
try
{
response = sendRequestBasedOnScheme(HttpsMethod.POST, body, uri, pathBuilder, API_VERSION_QUERY_STRING_PREFIX + apiVersion);
}
catch (IOException e)
{
throw new TransportException("Could not send request to HSM", e);
}
int responseCode = response.getStatus();
String responseBody = new String(response.getBody(), StandardCharsets.UTF_8);
if (responseCode >= 200 && responseCode < 300)
{
return SignResponse.fromJson(responseBody);
}
else
{
String exceptionMessage = "HttpsHsmClient received status code " + responseCode + " from provided uri.";
ErrorResponse errorResponse = ErrorResponse.fromJson(responseBody);
if (errorResponse != null)
{
exceptionMessage = exceptionMessage + " Error response message: " + errorResponse.getMessage();
}
throw IotHubStatusCode.getConnectionStatusException(IotHubStatusCode.getIotHubStatusCode(responseCode), exceptionMessage);
}
}
/**
* Retrieve a trust bundle from an hsm
* @param apiVersion the api version to use
* @return the trust bundle response from the hsm, contains the certificates to be trusted
* @throws TransportException if the HSM cannot be reached
*/
public TrustBundleResponse getTrustBundle(String apiVersion) throws TransportException
{
log.debug("Getting trust bundle...");
if (apiVersion == null || apiVersion.isEmpty())
{
throw new IllegalArgumentException("api version cannot be null or empty");
}
String uri = baseUrl != null ? baseUrl.replaceFirst("/*$", "") : "";
HttpsResponse response = null;
try
{
response = sendRequestBasedOnScheme(HttpsMethod.GET, new byte[0], uri, "/trust-bundle", API_VERSION_QUERY_STRING_PREFIX + apiVersion);
}
catch (IOException e)
{
throw IotHubStatusCode.getConnectionStatusException(IotHubStatusCode.IO_ERROR, "Could not send request to HSM");
}
int statusCode = response.getStatus();
String body = response.getBody() != null ? new String(response.getBody(), StandardCharsets.UTF_8) : "";
if (statusCode >= 200 && statusCode < 300)
{
return TrustBundleResponse.fromJson(body);
}
else
{
ErrorResponse errorResponse = ErrorResponse.fromJson(body);
if (errorResponse != null)
{
throw IotHubStatusCode.getConnectionStatusException(IotHubStatusCode.getIotHubStatusCode(statusCode), "Received error from hsm with status code " + statusCode + " and message " + errorResponse.getMessage());
}
else
{
throw IotHubStatusCode.getConnectionStatusException(IotHubStatusCode.getIotHubStatusCode(statusCode), "Received error from hsm with status code " + statusCode);
}
}
}
/**
* Send a given httpsRequest using the appropriate means based on the scheme (http vs unix) of the baseUrl
* @param httpsMethod the type of https method to call
* @param body the body of the https call
* @param baseUri the base uri to send the request to
* @param path the relative path of the request
* @param queryString the query string for the https request. Do not include the ? character
* @return the http response to the request
* @throws TransportException if the hsm cannot be reached
* @throws IOException if the hsm cannot be reached
*/
private HttpsResponse sendRequestBasedOnScheme(HttpsMethod httpsMethod, byte[] body, String baseUri, String path, String queryString) throws TransportException, IOException
{
URL requestUrl;
if (this.scheme.equalsIgnoreCase(HTTPS_SCHEME) || this.scheme.equalsIgnoreCase(HTTP_SCHEME))
{
if (queryString != null && !queryString.isEmpty())
{
requestUrl = new URL(baseUri + path + "?" + queryString);
}
else
{
requestUrl = new URL(baseUri + path);
}
}
else if (this.scheme.equalsIgnoreCase(UNIX_SCHEME))
{
//leave the url null, for unix flow, there is no need to build a URL instance
requestUrl = null;
}
else
{
throw new UnsupportedOperationException("unrecognized URI scheme. Only HTTPS, HTTP and UNIX are supported");
}
// requestUrl will be null, if unix socket is used, but HttpsRequest won't null check it until we send the request.
// In the unix case, we don't build the https request to send it, we just build it to hold all the information that
// will go into the unix socket request later, such as headers, method, etc.
HttpsRequest httpsRequest = new HttpsRequest(requestUrl, httpsMethod, body, "");
httpsRequest.setHeaderField("Accept", "application/json");
if (body.length > 0)
{
httpsRequest.setHeaderField("Content-Type", "application/json");
}
HttpsResponse response;
if (this.scheme.equalsIgnoreCase(HTTPS_SCHEME))
{
response = httpsRequest.send();
}
else if (this.scheme.equalsIgnoreCase(HTTP_SCHEME))
{
response = httpsRequest.sendAsHttpRequest();
}
else if (this.scheme.equalsIgnoreCase(UNIX_SCHEME))
{
if (this.unixDomainSocketChannel == null)
{
throw new IllegalArgumentException("Must provide an implementation of the UnixDomainSocketChannel interface since this edge runtime setup requires communicating over unix domain sockets.");
}
else
{
log.trace("User provided UnixDomainSocketChannel will be used for setup.");
}
String unixAddressPrefix = UNIX_SCHEME + "://";
String localUnixSocketPath = baseUri.substring(baseUri.indexOf(unixAddressPrefix) + unixAddressPrefix.length());
response = sendHttpRequestUsingUnixSocket(httpsRequest, path, queryString, localUnixSocketPath);
}
else
{
throw new UnsupportedOperationException("unrecognized URI scheme \"" + this.scheme + "\". Only HTTPS, HTTP and UNIX are supported");
}
return response;
}
/**
* Send an HTTP request over a unix domain socket
* @param httpsRequest the request to send
* @return the response from the HSM unit
* @throws IOException If the unix domain socket cannot be reached
*/
private HttpsResponse sendHttpRequestUsingUnixSocket(HttpsRequest httpsRequest, String httpRequestPath, String httpRequestQueryString, String unixSocketAddress) throws IOException
{
log.debug("Sending data over unix domain socket");
HttpsResponse response;
try
{
//write to socket
byte[] requestBytes = HttpsRequestResponseSerializer.serializeRequest(httpsRequest, httpRequestPath, httpRequestQueryString, unixSocketAddress);
unixDomainSocketChannel.open(unixSocketAddress);
if (httpsRequest.getBody() != null)
{
//append http request body to the request bytes
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
outputStream.write(requestBytes);
outputStream.write(httpsRequest.getBody());
log.trace("Writing {} bytes to unix domain socket", outputStream.size());
unixDomainSocketChannel.write(outputStream.toByteArray());
}
else
{
log.trace("Writing {} bytes to unix domain socket", requestBytes.length);
unixDomainSocketChannel.write(requestBytes);
}
//read response
String responseString = readResponseFromChannel(unixDomainSocketChannel);
response = HttpsRequestResponseSerializer.deserializeResponse(new BufferedReader(new StringReader(responseString)));
}
finally
{
log.trace("Closing unix domain socket");
unixDomainSocketChannel.close();
}
return response;
}
private String readResponseFromChannel(UnixDomainSocketChannel channel) throws IOException
{
log.debug("Reading response from unix domain socket");
byte[] buf = new byte[400];
StringBuilder responseStringBuilder = new StringBuilder();
int numRead = channel.read(buf);
// keep reading from the unix domain socket in chunks until no more bytes are read
while (numRead >= 0)
{
log.trace("Read {} bytes from unix domain socket", numRead);
// buf may not be filled completely, so take the subArray of bytes sized equal to numRead
String readChunk = new String(Arrays.copyOfRange(buf, 0, numRead), StandardCharsets.US_ASCII);
log.trace("Read chunk of data from unix domain socket:");
log.trace("{}", readChunk);
responseStringBuilder.append(readChunk);
// Read bytes from the channel
numRead = channel.read(buf);
}
String response = responseStringBuilder.toString();
log.debug("Read response from unix domain socket channel");
log.debug("{}", response);
return response;
}
}
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