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/*
* Copyright 2017 The gRPC Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.grpc.internal;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Supplier;
import io.grpc.HttpConnectProxiedSocketAddress;
import io.grpc.ProxiedSocketAddress;
import io.grpc.ProxyDetector;
import java.io.IOException;
import java.net.Authenticator;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.SocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/**
* A utility class that detects proxies using {@link ProxySelector} and detects authentication
* credentials using {@link Authenticator}.
*
*/
class ProxyDetectorImpl implements ProxyDetector {
// To validate this code: set up a local squid proxy instance, and
// try to communicate with grpc-test.sandbox.googleapis.com:443.
// The endpoint runs an instance of TestServiceGrpc, see
// AbstractInteropTest for an example how to run a
// TestService.EmptyCall RPC.
//
// The instructions below assume Squid 3.5.23 and a recent
// version of Debian.
//
// Set the contents of /etc/squid/squid.conf to be:
// WARNING: THESE CONFIGS HAVE NOT BEEN REVIEWED FOR SECURITY, DO
// NOT USE OUTSIDE OF TESTING. COMMENT OUT THIS WARNING TO
// UNBREAK THE CONFIG FILE.
// acl SSL_ports port 443
// acl Safe_ports port 80
// acl Safe_ports port 21
// acl Safe_ports port 443
// acl Safe_ports port 70
// acl Safe_ports port 210
// acl Safe_ports port 1025-65535
// acl Safe_ports port 280
// acl Safe_ports port 488
// acl Safe_ports port 591
// acl Safe_ports port 777
// acl CONNECT method CONNECT
// http_access deny !Safe_ports
// http_access deny CONNECT !SSL_ports
// http_access allow localhost manager
// http_access deny manager
// http_access allow localhost
// http_access deny all
// http_port 3128
// coredump_dir /var/spool/squid
// refresh_pattern ^ftp: 1440 20% 10080
// refresh_pattern ^gopher: 1440 0% 1440
// refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
// refresh_pattern . 0 20% 4320
//
// Restart squid:
// $ sudo /etc/init.d/squid restart
//
// To test with passwords:
//
// Run this command and follow the instructions to set up a user/pass:
// $ sudo htpasswd -c /etc/squid/passwd myuser1
//
// Make the file readable to squid:
// $ sudo chmod 644 /etc/squid/passwd
//
// Validate the username and password, you should see OK printed:
// $ /usr/lib/squid3/basic_ncsa_auth /etc/squid/passwd
// myuser1
//
// Add these additional lines to the beginning of squid.conf (the ordering matters):
// auth_param basic program /usr/lib/squid3/basic_ncsa_auth /etc/squid/passwd
// auth_param basic children 5
// auth_param basic realm Squid proxy-caching web server
// auth_param basic credentialsttl 2 hours
// acl ncsa_users proxy_auth REQUIRED
// http_access allow ncsa_users
//
// Restart squid:
// $ sudo /etc/init.d/squid restart
//
// In both cases, start the JVM with -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=3128 to
// configure the proxy. For passwords, use java.net.Authenticator.setDefault().
//
// Testing with curl, no password:
// $ curl -U myuser1:pass1 -x http://localhost:3128 -L grpc.io
// Testing with curl, with password:
// $ curl -U myuser1:pass1 -x http://localhost:3128 -L grpc.io
//
// It may be helpful to monitor the squid access logs:
// $ sudo tail -f /var/log/squid/access.log
private static final Logger log = Logger.getLogger(ProxyDetectorImpl.class.getName());
private static final AuthenticationProvider DEFAULT_AUTHENTICATOR = new AuthenticationProvider() {
@Override
public PasswordAuthentication requestPasswordAuthentication(
String host, InetAddress addr, int port, String protocol, String prompt, String scheme) {
URL url = null;
try {
url = new URL(protocol, host, port, "");
} catch (MalformedURLException e) {
// let url be null
log.log(
Level.WARNING,
"failed to create URL for Authenticator: {0} {1}", new Object[] {protocol, host});
}
return Authenticator.requestPasswordAuthentication(
host, addr, port, protocol, prompt, scheme, url, Authenticator.RequestorType.PROXY);
}
};
private static final Supplier DEFAULT_PROXY_SELECTOR =
new Supplier() {
@Override
public ProxySelector get() {
return ProxySelector.getDefault();
}
};
/**
* Experimental environment variable name for enabling proxy support.
*
* @deprecated Use the standard Java proxy configuration instead with flags such as:
* -Dhttps.proxyHost=HOST -Dhttps.proxyPort=PORT
*/
@Deprecated
private static final String GRPC_PROXY_ENV_VAR = "GRPC_PROXY_EXP";
// Do not hard code a ProxySelector because the global default ProxySelector can change
private final Supplier proxySelector;
private final AuthenticationProvider authenticationProvider;
private final InetSocketAddress overrideProxyAddress;
// We want an HTTPS proxy, which operates on the entire data stream (See IETF rfc2817).
static final String PROXY_SCHEME = "https";
/**
* A proxy selector that uses the global {@link ProxySelector#getDefault()} and
* {@link ProxyDetectorImpl.AuthenticationProvider} to detect proxy parameters.
*/
public ProxyDetectorImpl() {
this(DEFAULT_PROXY_SELECTOR, DEFAULT_AUTHENTICATOR, System.getenv(GRPC_PROXY_ENV_VAR));
}
@VisibleForTesting
ProxyDetectorImpl(
Supplier proxySelector,
AuthenticationProvider authenticationProvider,
@Nullable String proxyEnvString) {
this.proxySelector = checkNotNull(proxySelector);
this.authenticationProvider = checkNotNull(authenticationProvider);
if (proxyEnvString != null) {
overrideProxyAddress = overrideProxy(proxyEnvString);
} else {
overrideProxyAddress = null;
}
}
@Nullable
@Override
public ProxiedSocketAddress proxyFor(SocketAddress targetServerAddress) throws IOException {
if (!(targetServerAddress instanceof InetSocketAddress)) {
return null;
}
if (overrideProxyAddress != null) {
return HttpConnectProxiedSocketAddress.newBuilder()
.setProxyAddress(overrideProxyAddress)
.setTargetAddress((InetSocketAddress) targetServerAddress)
.build();
}
return detectProxy((InetSocketAddress) targetServerAddress);
}
private ProxiedSocketAddress detectProxy(InetSocketAddress targetAddr) throws IOException {
URI uri;
String host = targetAddr.getHostString();
try {
uri =
new URI(
PROXY_SCHEME,
null, /* userInfo */
host,
targetAddr.getPort(),
null, /* path */
null, /* query */
null /* fragment */);
} catch (final URISyntaxException e) {
log.log(
Level.WARNING,
"Failed to construct URI for proxy lookup, proceeding without proxy",
e);
return null;
}
ProxySelector proxySelector = this.proxySelector.get();
if (proxySelector == null) {
log.log(Level.FINE, "proxy selector is null, so continuing without proxy lookup");
return null;
}
List proxies = proxySelector.select(uri);
if (proxies.size() > 1) {
log.warning("More than 1 proxy detected, gRPC will select the first one");
}
Proxy proxy = proxies.get(0);
if (proxy.type() == Proxy.Type.DIRECT) {
return null;
}
InetSocketAddress proxyAddr = (InetSocketAddress) proxy.address();
// The prompt string should be the realm as returned by the server.
// We don't have it because we are avoiding the full handshake.
String promptString = "";
PasswordAuthentication auth =
authenticationProvider.requestPasswordAuthentication(
proxyAddr.getHostString(),
proxyAddr.getAddress(),
proxyAddr.getPort(),
PROXY_SCHEME,
promptString,
null);
final InetSocketAddress resolvedProxyAddr;
if (proxyAddr.isUnresolved()) {
InetAddress resolvedAddress = InetAddress.getByName(proxyAddr.getHostName());
resolvedProxyAddr = new InetSocketAddress(resolvedAddress, proxyAddr.getPort());
} else {
resolvedProxyAddr = proxyAddr;
}
HttpConnectProxiedSocketAddress.Builder builder =
HttpConnectProxiedSocketAddress.newBuilder()
.setTargetAddress(targetAddr)
.setProxyAddress(resolvedProxyAddr);
if (auth == null) {
return builder.build();
}
return builder
.setUsername(auth.getUserName())
.setPassword(auth.getPassword() == null ? null : new String(auth.getPassword()))
.build();
}
/**
* GRPC_PROXY_EXP is deprecated but let's maintain compatibility for now.
*/
private static InetSocketAddress overrideProxy(String proxyHostPort) {
if (proxyHostPort == null) {
return null;
}
String[] parts = proxyHostPort.split(":", 2);
int port = 80;
if (parts.length > 1) {
port = Integer.parseInt(parts[1]);
}
log.warning(
"Detected GRPC_PROXY_EXP and will honor it, but this feature will "
+ "be removed in a future release. Use the JVM flags "
+ "\"-Dhttps.proxyHost=HOST -Dhttps.proxyPort=PORT\" to set the https proxy for "
+ "this JVM.");
return new InetSocketAddress(parts[0], port);
}
/**
* This interface makes unit testing easier by avoiding direct calls to static methods.
*/
interface AuthenticationProvider {
PasswordAuthentication requestPasswordAuthentication(
String host,
InetAddress addr,
int port,
String protocol,
String prompt,
String scheme);
}
}
