org.apache.hadoop.security.ProviderUtils Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.security;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.alias.CredentialProviderFactory;
import org.apache.hadoop.security.alias.JavaKeyStoreProvider;
import org.apache.hadoop.security.alias.LocalJavaKeyStoreProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility methods for both key and credential provider APIs.
*
*/
public final class ProviderUtils {
@VisibleForTesting
public static final String NO_PASSWORD_WARN =
"WARNING: You have accepted the use of the default provider password\n" +
"by not configuring a password in one of the two following locations:\n";
@VisibleForTesting
public static final String NO_PASSWORD_ERROR =
"ERROR: The provider cannot find a password in the expected " +
"locations.\nPlease supply a password using one of the " +
"following two mechanisms:\n";
@VisibleForTesting
public static final String NO_PASSWORD_CONT =
"Continuing with the default provider password.\n";
@VisibleForTesting
public static final String NO_PASSWORD_INSTRUCTIONS_DOC =
"Please review the documentation regarding provider passwords in\n" +
"the keystore passwords section of the Credential Provider API\n";
private static final Logger LOG =
LoggerFactory.getLogger(ProviderUtils.class);
/**
* Hidden ctor to ensure that this utility class isn't
* instantiated explicitly.
*/
private ProviderUtils() {
// hide ctor for checkstyle compliance
}
/**
* Convert a nested URI to decode the underlying path. The translation takes
* the authority and parses it into the underlying scheme and authority.
* For example, "myscheme://hdfs@nn/my/path" is converted to
* "hdfs://nn/my/path".
* @param nestedUri the URI from the nested URI
* @return the unnested path
*/
public static Path unnestUri(URI nestedUri) {
StringBuilder result = new StringBuilder();
String authority = nestedUri.getAuthority();
if (authority != null) {
String[] parts = nestedUri.getAuthority().split("@", 2);
result.append(parts[0])
.append("://");
if (parts.length == 2) {
result.append(parts[1]);
}
}
result.append(nestedUri.getPath());
if (nestedUri.getQuery() != null) {
result.append("?");
result.append(nestedUri.getQuery());
}
if (nestedUri.getFragment() != null) {
result.append("#");
result.append(nestedUri.getFragment());
}
return new Path(result.toString());
}
/**
* Mangle given local java keystore file URI to allow use as a
* LocalJavaKeyStoreProvider.
* @param localFile absolute URI with file scheme and no authority component.
* i.e. return of File.toURI,
* e.g. file:///home/larry/creds.jceks
* @return URI of the form localjceks://file/home/larry/creds.jceks
* @throws IllegalArgumentException if localFile isn't not a file uri or if it
* has an authority component.
* @throws URISyntaxException if the wrapping process violates RFC 2396
*/
public static URI nestURIForLocalJavaKeyStoreProvider(final URI localFile)
throws URISyntaxException {
if (!("file".equals(localFile.getScheme()))) {
throw new IllegalArgumentException("passed URI had a scheme other than " +
"file.");
}
if (localFile.getAuthority() != null) {
throw new IllegalArgumentException("passed URI must not have an " +
"authority component. For non-local keystores, please use " +
JavaKeyStoreProvider.class.getName());
}
return new URI(LocalJavaKeyStoreProvider.SCHEME_NAME,
"//file" + localFile.getSchemeSpecificPart(), localFile.getFragment());
}
/**
* There are certain integrations of the credential provider API in
* which a recursive dependency between the provider and the hadoop
* filesystem abstraction causes a problem. These integration points
* need to leverage this utility method to remove problematic provider
* types from the existing provider path within the configuration.
*
* @param config the existing configuration with provider path
* @param fileSystemClass the class which providers must be compatible
* @return Configuration clone with new provider path
*/
public static Configuration excludeIncompatibleCredentialProviders(
Configuration config, Class fileSystemClass)
throws IOException {
String providerPath = config.get(
CredentialProviderFactory.CREDENTIAL_PROVIDER_PATH);
if (providerPath == null) {
return config;
}
StringBuffer newProviderPath = new StringBuffer();
String[] providers = providerPath.split(",");
Path path = null;
for (String provider: providers) {
try {
path = unnestUri(new URI(provider));
Class clazz = null;
try {
String scheme = path.toUri().getScheme();
clazz = FileSystem.getFileSystemClass(scheme, config);
} catch (IOException ioe) {
// not all providers are filesystem based
// for instance user:/// will not be able to
// have a filesystem class associated with it.
if (newProviderPath.length() > 0) {
newProviderPath.append(",");
}
newProviderPath.append(provider);
}
if (clazz != null) {
if (fileSystemClass.isAssignableFrom(clazz)) {
LOG.debug("Filesystem based provider excluded from provider " +
"path due to recursive dependency: {}", provider);
} else {
if (newProviderPath.length() > 0) {
newProviderPath.append(",");
}
newProviderPath.append(provider);
}
}
} catch (URISyntaxException e) {
LOG.warn("Credential Provider URI is invalid." + provider);
}
}
String effectivePath = newProviderPath.toString();
if (effectivePath.equals(providerPath)) {
return config;
}
Configuration conf = new Configuration(config);
if (effectivePath.equals("")) {
conf.unset(CredentialProviderFactory.CREDENTIAL_PROVIDER_PATH);
} else {
conf.set(CredentialProviderFactory.CREDENTIAL_PROVIDER_PATH,
effectivePath);
}
return conf;
}
/**
* The password is either found in the environment or in a file. This
* routine implements the logic for locating the password in these
* locations.
*
* @param envWithPass The name of the environment variable that might
* contain the password. Must not be null.
* @param fileWithPass The name of a file that could contain the password.
* Can be null.
* @return The password as a char []; null if not found.
* @throws IOException If fileWithPass is non-null and points to a
* nonexistent file or a file that fails to open and be read properly.
*/
public static char[] locatePassword(String envWithPass, String fileWithPass)
throws IOException {
char[] pass = null;
if (System.getenv().containsKey(envWithPass)) {
pass = System.getenv(envWithPass).toCharArray();
}
if (pass == null) {
if (fileWithPass != null) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
URL pwdFile = cl.getResource(fileWithPass);
if (pwdFile == null) {
// Provided Password file does not exist
throw new IOException("Password file does not exist");
}
try (InputStream is = pwdFile.openStream()) {
pass = IOUtils.toString(is).trim().toCharArray();
}
}
}
return pass;
}
private static String noPasswordInstruction(String envKey, String fileKey) {
return
" * In the environment variable " + envKey + "\n" +
" * In a file referred to by the configuration entry\n" +
" " + fileKey + ".\n" +
NO_PASSWORD_INSTRUCTIONS_DOC;
}
public static String noPasswordWarning(String envKey, String fileKey) {
return NO_PASSWORD_WARN + noPasswordInstruction(envKey, fileKey) +
NO_PASSWORD_CONT;
}
public static String noPasswordError(String envKey, String fileKey) {
return NO_PASSWORD_ERROR + noPasswordInstruction(envKey, fileKey);
}
}
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