zdm/envoy
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Add token-based authentication (without rejection handling)

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This commit is contained in:
Kai S. K. Engelbart
2020-09-19 11:37:42 +02:00
parent 31cb22035b
commit f21d077522
10 changed files with 178 additions and 35 deletions
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8
server/src/main/java/envoy/server/data/ServerConfig.java
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@@ -35,6 +35,8 @@ public final class ServerConfig extends Config {
put("enableIssueReporting", "e-ir", Boolean::parseBoolean);
put("enableGroups", "e-g", Boolean::parseBoolean);
put("enableAttachments", "e-a", Boolean::parseBoolean);
// user authentication
put("authTokenExpiration", "tok-exp", Integer::parseInt);
}
/**
@@ -93,4 +95,10 @@ public final class ServerConfig extends Config {
* @since Envoy Server v0.2-beta
*/
public String getIssueAuthToken() { return (String) items.get("issueAuthToken").get(); }
/**
* @return the amount of days after which user authentication tokens expire
* @since Envoy Server v0.2-beta
*/
public Integer getAuthTokenExpiration() { return (Integer) items.get("authTokenExpiration").get(); }
}

61
server/src/main/java/envoy/server/processors/LoginCredentialProcessor.java
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@@ -5,26 +5,18 @@ import static envoy.data.User.UserStatus.ONLINE;
import static envoy.event.HandshakeRejection.*;
import java.time.Instant;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.logging.Logger;
import javax.persistence.NoResultException;
import envoy.data.LoginCredentials;
import envoy.event.GroupMessageStatusChange;
import envoy.event.HandshakeRejection;
import envoy.event.MessageStatusChange;
import envoy.server.data.GroupMessage;
import envoy.server.data.PersistenceManager;
import envoy.server.data.User;
import envoy.server.net.ConnectionManager;
import envoy.server.net.ObjectWriteProxy;
import envoy.server.util.PasswordUtil;
import envoy.server.util.VersionUtil;
import envoy.util.Bounds;
import envoy.util.EnvoyLog;
import envoy.event.*;
import envoy.server.data.*;
import envoy.server.net.*;
import envoy.server.util.*;
import envoy.util.*;
/**
* This {@link ObjectProcessor} handles {@link LoginCredentials}.<br>
@@ -62,17 +54,31 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
try {
user = persistenceManager.getUserByName(credentials.getIdentifier());
// Checking if user is already online
// Check if the user is already online
if (connectionManager.isOnline(user.getID())) {
logger.warning(user + " is already online!");
writeProxy.write(socketID, new HandshakeRejection(INTERNAL_ERROR));
return;
}
// Evaluating the correctness of the password hash
if (!PasswordUtil.validate(credentials.getPassword(), user.getPasswordHash())) {
logger.info(user + " has entered the wrong password.");
writeProxy.write(socketID, new HandshakeRejection(WRONG_PASSWORD_OR_USER));
return;
// Authenticate with password or token
if (credentials.usesToken()) {
// Check the token
if (user.getAuthToken() == null || user.getAuthTokenExpiration().isBefore(Instant.now())
|| !user.getAuthToken().equals(credentials.getPassword())) {
logger.info(user + " tried to use an invalid token.");
writeProxy.write(socketID, new HandshakeRejection(INVALID_TOKEN));
return;
}
} else {
// Check the password hash
if (!PasswordUtil.validate(credentials.getPassword(), user.getPasswordHash())) {
logger.info(user + " has entered the wrong password.");
writeProxy.write(socketID, new HandshakeRejection(WRONG_PASSWORD_OR_USER));
return;
}
}
} catch (NoResultException e) {
logger.info("The requested user does not exist.");
@@ -80,6 +86,7 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
return;
}
} else {
// Validate user name
if (!Bounds.isValidContactName(credentials.getIdentifier())) {
logger.info("The requested user name is not valid.");
@@ -87,7 +94,8 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
return;
}
try {
// Checking that no user already has this identifier
// Check if the name is taken
PersistenceManager.getInstance().getUserByName(credentials.getIdentifier());
// This code only gets executed if this user already exists
@@ -114,6 +122,15 @@ public final class LoginCredentialProcessor implements ObjectProcessor<LoginCred
user.setStatus(ONLINE);
UserStatusChangeProcessor.updateUserStatus(user);
// Generate a new token if requested
if (credentials.requestToken()) {
String token = AuthTokenGenerator.nextToken();
user.setAuthToken(token);
user.setAuthTokenExpiration(Instant.now().plus(ServerConfig.getInstance().getAuthTokenExpiration().longValue(), ChronoUnit.DAYS));
persistenceManager.updateContact(user);
writeProxy.write(socketID, new NewAuthToken(token));
}
final var pendingMessages = PersistenceManager.getInstance().getPendingMessages(user, credentials.getLastSync());
pendingMessages.removeIf(GroupMessage.class::isInstance);
logger.fine("Sending " + pendingMessages.size() + " pending messages to " + user + "...");

35
server/src/main/java/envoy/server/util/AuthTokenGenerator.java Normal file
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@@ -0,0 +1,35 @@
package envoy.server.util;
import java.security.SecureRandom;
/**
* Provides a secure token generation algorithm.
* <p>
* Project: <strong>envoy-server</strong><br>
* File: <strong>AuthTokenGenerator.java</strong><br>
* Created: <strong>19.09.2020</strong><br>
*
* @author Kai S. K. Engelbart
* @since Envoy Server v0.2-beta
*/
public final class AuthTokenGenerator {
private static final int TOKEN_LENGTH = 128;
private static final char[] CHARACTERS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
private static final char[] BUFF = new char[TOKEN_LENGTH];
private static final SecureRandom RANDOM = new SecureRandom();
private AuthTokenGenerator() {}
/**
* Generates a random authentication token.
*
* @return a random authentication token
* @since Envoy Server v0.2-beta
*/
public static String nextToken() {
for (int i = 0; i < BUFF.length; ++i)
BUFF[i] = CHARACTERS[RANDOM.nextInt(CHARACTERS.length)];
return new String(BUFF);
}
}