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/*
* Copyright 2014-2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.auth;
import com.amazonaws.util.DateUtils;
import com.amazonaws.util.IOUtils;
import com.amazonaws.util.Platform;
import com.amazonaws.util.StringUtils;
import com.amazonaws.util.ValidationUtils;
import com.amazonaws.util.json.Jackson;
import com.fasterxml.jackson.databind.JsonNode;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.joda.time.DateTime;
/**
* A credentials provider that can load credentials from an external process. This is used to support the credential_process
* setting in the profile credentials file. See
* https://docs.aws.amazon.com/cli/latest/topic/config-vars.html#sourcing-credentials-from-external-processes for more
* information.
*
* Created using {@link #builder()}.
*
* Available settings:
*
*
Command - The command that should be executed to retrieve credentials.
*
ExpirationBuffer - The amount of time between when the credentials expire and when the credentials should start to be
* refreshed. This allows the credentials to be refreshed *before* they are reported to expire. Default: 15 seconds.
*
ProcessOutputLimit - The maximum amount of data that can be returned by the external process before an exception is
* raised. Default: 64000 bytes.
*
*/
public final class ProcessCredentialsProvider implements AWSCredentialsProvider {
private final List command;
private final int expirationBufferValue;
private final TimeUnit expirationBufferUnit;
private final long processOutputLimit;
private final Object credentialLock = new Object();
private volatile AWSCredentials credentials = null;
private volatile DateTime credentialExpirationTime = DateTime.now();
/**
* @see #builder()
*/
private ProcessCredentialsProvider(Builder builder) {
List cmd = new ArrayList();
if (Platform.isWindows()) {
cmd.add("cmd.exe");
cmd.add("/C");
} else {
cmd.add("sh");
cmd.add("-c");
}
String builderCommand = ValidationUtils.assertNotNull(builder.command, "command");
cmd.add(builderCommand);
this.command = Collections.unmodifiableList(cmd);
this.processOutputLimit = ValidationUtils.assertNotNull(builder.processOutputLimit, "processOutputLimit");
this.expirationBufferValue = ValidationUtils.assertNotNull(builder.expirationBufferValue, "expirationBufferValue");
this.expirationBufferUnit = ValidationUtils.assertNotNull(builder.expirationBufferUnit, "expirationBufferUnit");
}
/**
* Retrieve a new builder that can be used to create and configure a {@link ProcessCredentialsProvider}.
*/
public static Builder builder() {
return new Builder();
}
@Override
public AWSCredentials getCredentials() {
if (credentialsNeedUpdating()) {
synchronized (credentialLock) {
if (credentialsNeedUpdating()) {
refresh();
}
}
}
return credentials;
}
@Override
public void refresh() {
try {
String processOutput = executeCommand();
JsonNode credentialsJson = parseProcessOutput(processOutput);
AWSCredentials credentials = credentials(credentialsJson);
DateTime credentialExpirationTime = credentialExpirationTime(credentialsJson);
this.credentials = credentials;
this.credentialExpirationTime = credentialExpirationTime;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Process-based credential refreshing has been interrupted.", e);
} catch (Exception e) {
throw new IllegalStateException("Failed to refresh process-based credentials.", e);
}
}
/**
* Get the time at which this credentials provider will block to refresh the credentials. This is usually the expiration time
* returned by the credentials process, minus the configured expiration buffer.
*/
public DateTime getCredentialExpirationTime() {
return credentialExpirationTime;
}
/**
* Determine whether the current state of the credentials warrant refreshing.
*/
private boolean credentialsNeedUpdating() {
return credentials == null || credentialExpirationTime.isBeforeNow();
}
/**
* Parse the output from the credentials process.
*/
private JsonNode parseProcessOutput(String processOutput) {
JsonNode credentialsJson = Jackson.fromSensitiveJsonString(processOutput, JsonNode.class);
if (!credentialsJson.isObject()) {
throw new IllegalStateException("Process did not return a JSON object.");
}
JsonNode version = credentialsJson.get("Version");
if (version == null || !version.isInt() || version.asInt() != 1) {
throw new IllegalStateException("Unsupported credential version: " + version);
}
return credentialsJson;
}
/**
* Parse the process output to retrieve the credentials.
*/
private AWSCredentials credentials(JsonNode credentialsJson) {
String accessKeyId = getText(credentialsJson, "AccessKeyId");
String secretAccessKey = getText(credentialsJson, "SecretAccessKey");
String sessionToken = getText(credentialsJson, "SessionToken");
ValidationUtils.assertStringNotEmpty(accessKeyId, "AccessKeyId");
ValidationUtils.assertStringNotEmpty(secretAccessKey, "SecretAccessKey");
if (sessionToken != null) {
return new BasicSessionCredentials(accessKeyId, secretAccessKey, sessionToken);
} else {
return new BasicAWSCredentials(accessKeyId, secretAccessKey);
}
}
/**
* Parse the process output to retrieve the expiration date and time. The result includes any configured expiration buffer.
*/
private DateTime credentialExpirationTime(JsonNode credentialsJson) {
String expiration = getText(credentialsJson, "Expiration");
if (expiration != null) {
DateTime credentialExpiration = new DateTime(DateUtils.parseISO8601Date(expiration));
credentialExpiration = credentialExpiration.minus(expirationBufferUnit.toMillis(expirationBufferValue));
return credentialExpiration;
} else {
return DateTime.now().plusYears(9999);
}
}
/**
* Get a textual value from a json object, throwing an exception if the node is missing or not textual.
*/
private String getText(JsonNode jsonObject, String nodeName) {
JsonNode subNode = jsonObject.get(nodeName);
if (subNode == null) {
return null;
}
if (!subNode.isTextual()) {
throw new IllegalStateException(nodeName + " from credential process should be textual, but was " +
subNode.getNodeType());
}
return subNode.asText();
}
/**
* Execute the external process to retrieve credentials.
*/
private String executeCommand() throws IOException, InterruptedException {
ProcessBuilder processBuilder = new ProcessBuilder(command);
ByteArrayOutputStream commandOutput = new ByteArrayOutputStream();
Process process = processBuilder.start();
try {
IOUtils.copy(process.getInputStream(), commandOutput, processOutputLimit);
process.waitFor();
if (process.exitValue() != 0) {
throw new IllegalStateException("Command returned non-zero exit value: " + process.exitValue());
}
return new String(commandOutput.toByteArray(), StringUtils.UTF8);
} finally {
process.destroy();
}
}
/**
* Used to configure and create a {@link ProcessCredentialsProvider}. See {@link #builder()} creation.
*/
public static class Builder {
private String command;
private int expirationBufferValue = 15;
private TimeUnit expirationBufferUnit = TimeUnit.SECONDS;
private long processOutputLimit = 64000;
/**
* @see #builder()
*/
private Builder() {}
/**
* Configure the command that should be executed to retrieve credentials.
*/
private void setCommand(String command) {
this.command = command;
}
/**
* @see #setCommand(String)
*/
public Builder withCommand(String command) {
setCommand(command);
return this;
}
/**
* Configure the amount of time between when the credentials expire and when the credentials should start to be
* refreshed. This allows the credentials to be refreshed *before* they are reported to expire.
*
* Default: 15 seconds.
*/
public void setCredentialExpirationBuffer(int value, TimeUnit unit) {
this.expirationBufferValue = value;
this.expirationBufferUnit = unit;
}
/**
* @see #setCredentialExpirationBuffer(int, TimeUnit)
*/
public Builder withCredentialExpirationBuffer(int value, TimeUnit unit) {
setCredentialExpirationBuffer(value, unit);
return this;
}
/**
* Configure the maximum amount of data that can be returned by the external process before an exception is
* raised.
*
* Default: 64000 bytes.
*/
private void setProcessOutputLimit(long outputByteLimit) {
this.processOutputLimit = outputByteLimit;
}
/**
* @see #setProcessOutputLimit(long)
*/
public Builder withProcessOutputLimit(long outputByteLimit) {
setProcessOutputLimit(outputByteLimit);
return this;
}
public ProcessCredentialsProvider build() {
return new ProcessCredentialsProvider(this);
}
}
}
