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/*
* Copyright (C) 2008-2020, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.juick;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.model.AnonymousUser;
import com.juick.model.User;
import com.juick.service.UserService;
import com.juick.service.activities.DeleteUserEvent;
import com.juick.util.DateFormattersHolder;
import com.juick.www.api.activity.model.Context;
import com.juick.www.api.activity.model.objects.Actor;
import com.juick.www.api.webfinger.model.Account;
import com.juick.www.api.webfinger.model.Link;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;
import org.tomitribe.auth.signatures.Base64;
import org.tomitribe.auth.signatures.MissingRequiredHeaderException;
import org.tomitribe.auth.signatures.Signature;
import org.tomitribe.auth.signatures.Signer;
import org.tomitribe.auth.signatures.Verifier;
import rocks.xmpp.addr.Jid;
import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.time.Instant;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import static com.juick.www.api.activity.model.Context.ACTIVITY_MEDIA_TYPE;
public class SignatureManager {
private static final Logger logger = LoggerFactory.getLogger("ActivityPub");
@Inject
private KeystoreManager keystoreManager;
@Inject
private ObjectMapper jsonMapper;
@Inject
private UserService userService;
@Inject
private RestTemplate apClient;
@Inject
private ApplicationEventPublisher applicationEventPublisher;
public void post(Actor from, Actor to, Context data) throws IOException, NoSuchAlgorithmException {
UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(to.getInbox());
URI inbox = uriComponentsBuilder.build().toUri();
Instant now = Instant.now();
String requestDate = DateFormattersHolder.getHttpDateFormatter().format(now);
String host = inbox.getPort() > 0 ? String.format("%s:%d", inbox.getHost(), inbox.getPort()) : inbox.getHost();
var finalContext = Context.build(data);
var payload = jsonMapper.writeValueAsString(finalContext);
final byte[] digest = MessageDigest.getInstance("SHA-256").digest(payload.getBytes()); // (1)
final String digestHeader = "SHA-256=" + new String(Base64.encodeBase64(digest));
String signatureString = addSignature(from, host, "POST", inbox.getPath(), requestDate, digestHeader);
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("Content-Type", Context.ACTIVITYSTREAMS_PROFILE_MEDIA_TYPE);
requestHeaders.add("Date", requestDate);
requestHeaders.add("Host", host);
requestHeaders.add("Digest", digestHeader);
requestHeaders.add("Signature", signatureString);
HttpEntity<String> request = new HttpEntity<>(payload, requestHeaders);
logger.info("Sending context to {}: {}", to.getId(), payload);
ResponseEntity<Void> response = apClient.postForEntity(inbox, request, Void.class);
logger.info("Remote response: {}", response.getStatusCodeValue());
}
public String addSignature(Actor from, String host, String method, String path, String dateString,
String digestHeader) throws IOException {
return addSignature(from, host, method, path, dateString, digestHeader, keystoreManager);
}
public String addSignature(Actor from, String host, String method, String path, String dateString,
String digestHeader, KeystoreManager keystoreManager) throws IOException {
List<String> requiredHeaders = StringUtils.isEmpty(digestHeader)
? Arrays.asList("(request-target)", "host", "date")
: Arrays.asList("(request-target)", "host", "date", "digest");
Signature templateSignature = new Signature(from.getPublicKey().getId(), "rsa-sha256", null, requiredHeaders);
Map<String, String> headers = new HashMap<>();
headers.put("host", host);
headers.put("date", dateString);
if (StringUtils.isNotEmpty(digestHeader)) {
headers.put("digest", digestHeader);
}
Signer signer = new Signer(keystoreManager.getPrivateKey(), templateSignature);
Signature signature = signer.sign(method, path, headers);
// remove "Signature: " from result
return signature.toString().substring(10);
}
public User verifySignature(String method, String path, Map<String, String> headers) {
String signatureString = headers.get("signature");
Signature signature = Signature.fromString(signatureString);
Optional<Context> context = getContext(
UriComponentsBuilder.fromUriString(signature.getKeyId()).fragment(null).build().toUri());
if (context.isPresent() && context.get() instanceof Actor) {
Actor actor = (Actor) context.get();
Key key = KeystoreManager.publicKeyOf(actor);
Verifier verifier = new Verifier(key, signature);
try {
boolean result = verifier.verify(method, path, headers);
if (result) {
User user = new User();
user.setUri(URI.create(actor.getId()));
if (key.equals(keystoreManager.getPublicKey())) {
return userService.getUserByName(actor.getName());
}
if (actor.isSuspended()) {
logger.info("{} is suspended, deleting", actor.getId());
applicationEventPublisher.publishEvent(new DeleteUserEvent(this, actor.getId()));
}
return user;
} else {
return AnonymousUser.INSTANCE;
}
} catch (NoSuchAlgorithmException | SignatureException | MissingRequiredHeaderException | IOException e) {
logger.warn("Invalid signature {}: {}", signatureString, e.getMessage());
}
} else {
logger.warn("Unknown keyId");
}
return AnonymousUser.INSTANCE;
}
public Optional<Context> getContext(URI contextUri) {
try {
Context context = apClient.getForEntity(contextUri, Context.class).getBody();
if (context == null) {
logger.warn("Cannot identify {}", contextUri);
return Optional.empty();
}
return Optional.of(context);
} catch (Exception e) {
logger.warn("REST Exception on {}: {}", contextUri, e.getMessage());
}
return Optional.empty();
}
public Optional<Context> discoverPerson(String acct) {
Jid acctId = Jid.of(acct);
URI resourceUri = UriComponentsBuilder.fromPath("/.well-known/webfinger").host(acctId.getDomain())
.scheme("https").queryParam("resource", String.format("%s", acctId.toEscapedString())).build().toUri();
HttpHeaders headers = new HttpHeaders();
headers.add("Accept", "application/jrd+json");
HttpEntity<Void> webfingerRequest = new HttpEntity<>(headers);
try {
ResponseEntity<Account> response = apClient.exchange(resourceUri, HttpMethod.GET, webfingerRequest,
Account.class);
if (response.getStatusCode().is2xxSuccessful()) {
Account acctData = response.getBody();
if (acctData != null) {
for (Link l : acctData.getLinks()) {
if (l.getRel().equals("self") && l.getType().equals(ACTIVITY_MEDIA_TYPE)) {
return getContext(URI.create(l.getHref()));
}
}
}
}
} catch (RestClientException e) {
logger.warn("Cannot discover person {}: {}", acct, e.getMessage());
return Optional.empty();
}
return Optional.empty();
}
}
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