org.apache.hadoop.security.alias.CredentialShell 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.alias;
import java.io.Console;
import java.io.IOException;
import java.security.InvalidParameterException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.List;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.tools.CommandShell;
import org.apache.hadoop.util.ToolRunner;
/**
* This program is the CLI utility for the CredentialProvider facilities in
* Hadoop.
*/
public class CredentialShell extends CommandShell {
final static private String USAGE_PREFIX = "Usage: hadoop credential " +
"[generic options]\n";
final static private String COMMANDS =
" [-help]\n" +
" [" + CreateCommand.USAGE + "]\n" +
" [" + DeleteCommand.USAGE + "]\n" +
" [" + ListCommand.USAGE + "]\n";
@VisibleForTesting
public static final String NO_VALID_PROVIDERS =
"There are no valid (non-transient) providers configured.\n" +
"No action has been taken. Use the -provider option to specify\n" +
"a provider. If you want to use a transient provider then you\n" +
"MUST use the -provider argument.";
private boolean interactive = true;
/** If true, fail if the provider requires a password and none is given. */
private boolean strict = false;
private boolean userSuppliedProvider = false;
private String value = null;
private PasswordReader passwordReader;
/**
* Parse the command line arguments and initialize the data.
*
* % hadoop credential create alias [-provider providerPath]
* % hadoop credential list [-provider providerPath]
* % hadoop credential delete alias [-provider providerPath] [-f]
*
* @param args
* @return 0 if the argument(s) were recognized, 1 otherwise
* @throws IOException
*/
@Override
protected int init(String[] args) throws IOException {
// no args should print the help message
if (0 == args.length) {
ToolRunner.printGenericCommandUsage(getErr());
return 1;
}
for (int i = 0; i < args.length; i++) { // parse command line
if (args[i].equals("create")) {
if (i == args.length - 1) {
return 1;
}
setSubCommand(new CreateCommand(args[++i]));
} else if (args[i].equals("delete")) {
if (i == args.length - 1) {
return 1;
}
setSubCommand(new DeleteCommand(args[++i]));
} else if (args[i].equals("list")) {
setSubCommand(new ListCommand());
} else if (args[i].equals("-provider")) {
if (i == args.length - 1) {
return 1;
}
userSuppliedProvider = true;
getConf().set(CredentialProviderFactory.CREDENTIAL_PROVIDER_PATH,
args[++i]);
} else if (args[i].equals("-f") || (args[i].equals("-force"))) {
interactive = false;
} else if (args[i].equals("-strict")) {
strict = true;
} else if (args[i].equals("-v") || (args[i].equals("-value"))) {
value = args[++i];
} else if (args[i].equals("-help")) {
printShellUsage();
return 0;
} else {
ToolRunner.printGenericCommandUsage(getErr());
return 1;
}
}
return 0;
}
@Override
public String getCommandUsage() {
StringBuffer sbuf = new StringBuffer(USAGE_PREFIX + COMMANDS);
String banner = StringUtils.repeat("=", 66);
sbuf.append(banner + "\n");
sbuf.append(CreateCommand.USAGE + ":\n\n" + CreateCommand.DESC + "\n");
sbuf.append(banner + "\n");
sbuf.append(DeleteCommand.USAGE + ":\n\n" + DeleteCommand.DESC + "\n");
sbuf.append(banner + "\n");
sbuf.append(ListCommand.USAGE + ":\n\n" + ListCommand.DESC + "\n");
return sbuf.toString();
}
private abstract class Command extends SubCommand {
protected CredentialProvider provider = null;
protected CredentialProvider getCredentialProvider() {
CredentialProvider prov = null;
List providers;
try {
providers = CredentialProviderFactory.getProviders(getConf());
if (userSuppliedProvider) {
prov = providers.get(0);
} else {
for (CredentialProvider p : providers) {
if (!p.isTransient()) {
prov = p;
break;
}
}
}
} catch (IOException e) {
e.printStackTrace(getErr());
}
if (prov == null) {
getOut().println(NO_VALID_PROVIDERS);
}
return prov;
}
protected void printProviderWritten() {
getOut().println("Provider " + provider.toString() + " was updated.");
}
protected void warnIfTransientProvider() {
if (provider.isTransient()) {
getOut().println("WARNING: you are modifying a transient provider.");
}
}
protected void doHelp() {
getOut().println(USAGE_PREFIX + COMMANDS);
printShellUsage();
}
public abstract void execute() throws Exception;
public abstract String getUsage();
}
private class ListCommand extends Command {
public static final String USAGE =
"list [-provider provider-path] [-strict]";
public static final String DESC =
"The list subcommand displays the aliases contained within \n" +
"a particular provider - as configured in core-site.xml or\n" +
"indicated through the -provider argument. If -strict is supplied,\n" +
"fail immediately if the provider requires a password and none is\n" +
"provided.";
public boolean validate() {
provider = getCredentialProvider();
return (provider != null);
}
public void execute() throws IOException {
List aliases;
try {
aliases = provider.getAliases();
getOut().println("Listing aliases for CredentialProvider: " +
provider.toString());
for (String alias : aliases) {
getOut().println(alias);
}
} catch (IOException e) {
getOut().println("Cannot list aliases for CredentialProvider: " +
provider.toString()
+ ": " + e.getMessage());
throw e;
}
}
@Override
public String getUsage() {
return USAGE + ":\n\n" + DESC;
}
}
private class DeleteCommand extends Command {
public static final String USAGE =
"delete [-f] [-provider provider-path] [-strict]";
public static final String DESC =
"The delete subcommand deletes the credential\n" +
"specified as the argument from within the provider\n" +
"indicated through the -provider argument. The command asks for\n" +
"confirmation unless the -f option is specified. If -strict is\n" +
"supplied, fail immediately if the provider requires a password\n" +
"and none is given.";
private String alias = null;
private boolean cont = true;
public DeleteCommand(String alias) {
this.alias = alias;
}
@Override
public boolean validate() {
if (alias == null) {
getOut().println("There is no alias specified. Please provide the" +
"mandatory . See the usage description with -help.");
return false;
}
if (alias.equals("-help")) {
return true;
}
provider = getCredentialProvider();
if (provider == null) {
return false;
}
if (interactive) {
try {
cont = ToolRunner
.confirmPrompt("You are about to DELETE the credential " +
alias + " from CredentialProvider " + provider.toString() +
". Continue? ");
if (!cont) {
getOut().println("Nothing has been deleted.");
}
return cont;
} catch (IOException e) {
getOut().println(alias + " will not be deleted.");
e.printStackTrace(getErr());
}
}
return true;
}
public void execute() throws IOException {
if (alias.equals("-help")) {
doHelp();
return;
}
warnIfTransientProvider();
getOut().println("Deleting credential: " + alias +
" from CredentialProvider: " + provider.toString());
if (cont) {
try {
provider.deleteCredentialEntry(alias);
getOut().println("Credential " + alias +
" has been successfully deleted.");
provider.flush();
printProviderWritten();
} catch (IOException e) {
getOut().println("Credential " + alias + " has NOT been deleted.");
throw e;
}
}
}
@Override
public String getUsage() {
return USAGE + ":\n\n" + DESC;
}
}
private class CreateCommand extends Command {
public static final String USAGE = "create [-value alias-value] " +
"[-provider provider-path] [-strict]";
public static final String DESC =
"The create subcommand creates a new credential for the name\n" +
"specified as the argument within the provider indicated\n" +
"through the -provider argument. If -strict is supplied, fail\n" +
"immediately if the provider requires a password and none is given.\n" +
"If -value is provided, use that for the value of the credential\n" +
"instead of prompting the user.";
private String alias = null;
public CreateCommand(String alias) {
this.alias = alias;
}
public boolean validate() {
if (alias == null) {
getOut().println("There is no alias specified. Please provide the" +
"mandatory . See the usage description with -help.");
return false;
}
if (alias.equals("-help")) {
return true;
}
try {
provider = getCredentialProvider();
if (provider == null) {
return false;
} else if (provider.needsPassword()) {
if (strict) {
getOut().println(provider.noPasswordError());
return false;
} else {
getOut().println(provider.noPasswordWarning());
}
}
} catch (IOException e) {
e.printStackTrace(getErr());
}
return true;
}
public void execute() throws IOException, NoSuchAlgorithmException {
if (alias.equals("-help")) {
doHelp();
return;
}
warnIfTransientProvider();
try {
char[] credential = null;
if (value != null) {
// testing only
credential = value.toCharArray();
} else {
credential = promptForCredential();
}
provider.createCredentialEntry(alias, credential);
provider.flush();
getOut().println(alias + " has been successfully created.");
printProviderWritten();
} catch (InvalidParameterException e) {
getOut().println("Credential " + alias + " has NOT been created. " +
e.getMessage());
throw e;
} catch (IOException e) {
getOut().println("Credential " + alias + " has NOT been created. " +
e.getMessage());
throw e;
}
}
@Override
public String getUsage() {
return USAGE + ":\n\n" + DESC;
}
}
protected char[] promptForCredential() throws IOException {
PasswordReader c = getPasswordReader();
if (c == null) {
throw new IOException("No console available for prompting user.");
}
char[] cred = null;
boolean noMatch;
do {
char[] newPassword1 = c.readPassword("Enter alias password: ");
char[] newPassword2 = c.readPassword("Enter alias password again: ");
noMatch = !Arrays.equals(newPassword1, newPassword2);
if (noMatch) {
if (newPassword1 != null) {
Arrays.fill(newPassword1, ' ');
}
c.format("Passwords don't match. Try again.%n");
} else {
cred = newPassword1;
}
if (newPassword2 != null) {
Arrays.fill(newPassword2, ' ');
}
} while (noMatch);
return cred;
}
public PasswordReader getPasswordReader() {
if (passwordReader == null) {
passwordReader = new PasswordReader();
}
return passwordReader;
}
public void setPasswordReader(PasswordReader reader) {
passwordReader = reader;
}
/** To facilitate testing since Console is a final class. */
public static class PasswordReader {
public char[] readPassword(String prompt) {
Console console = System.console();
char[] pass = console.readPassword(prompt);
return pass;
}
public void format(String message) {
Console console = System.console();
console.format(message);
}
}
/**
* Main program.
*
* @param args
* Command line arguments
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(new Configuration(), new CredentialShell(), args);
System.exit(res);
}
}
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