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Implementation for blocking fraudulent 3PID /unbind attempts

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This commit is contained in:
Max Dor
2019-02-01 02:34:52 +01:00
parent 4237eeb3b6
commit 635f6fdbe7
21 changed files with 361 additions and 37 deletions
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40
src/main/java/io/kamax/mxisd/http/undertow/handler/identity/v1/SessionTpidUnbindHandler.java
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@@ -21,10 +21,9 @@
package io.kamax.mxisd.http.undertow.handler.identity.v1;
import com.google.gson.JsonObject;
import io.kamax.mxisd.exception.FeatureNotAvailable;
import io.kamax.mxisd.exception.NotAllowedException;
import io.kamax.mxisd.http.IsAPIv1;
import io.kamax.mxisd.http.undertow.handler.BasicHttpHandler;
import io.kamax.mxisd.session.SessionMananger;
import io.undertow.server.HttpServerExchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -33,38 +32,19 @@ public class SessionTpidUnbindHandler extends BasicHttpHandler {
public static final String Path = IsAPIv1.Base + "/3pid/unbind";
private transient final Logger log = LoggerFactory.getLogger(SessionTpidUnbindHandler.class);
private static final Logger log = LoggerFactory.getLogger(SessionTpidUnbindHandler.class);
private final SessionMananger sessMgr;
public SessionTpidUnbindHandler(SessionMananger sessMgr) {
this.sessMgr = sessMgr;
}
@Override
public void handleRequest(HttpServerExchange exchange) {
JsonObject body = parseJsonObject(exchange);
// TODO also check for HS header to know which domain attempting the unbind
if (body.entrySet().size() == 2 && body.has("mxisd") && body.has("threepid")) {
/* This is a HS request to remove a 3PID and is considered:
* - An attack on user privacy
* - A baffling spec breakage requiring IS and HS 3PID info to be independent [1]
* - A baffling spec breakage that 3PID (un)bind is only one way [2]
*
* Given the lack of response on our extensive feedback on the proposal [3] which has not landed in the spec yet [4],
* We'll be denying such unbind requests and will inform users using their 3PID that a fraudulent attempt of
* removing their 3PID binding has been attempting but blocked.
*
* [1]: https://matrix.org/docs/spec/client_server/r0.4.0.html#adding-account-administrative-contact-information
* [2]: https://matrix.org/docs/spec/identity_service/r0.1.0.html#privacy
* [3]: https://docs.google.com/document/d/135g2muVxmuml0iUnLoTZxk8M2ZSt3kJzg81chGh51yg/edit
* [4]: https://github.com/matrix-org/matrix-doc/issues/1194
*/
log.warn("A remote host attempted to unbind without proper authorization. Request was denied");
// TODO notify the 3PID owner
throw new NotAllowedException("You have attempted to alter 3PID bindings, which can only be done by the 3PID owner directly. " +
"We have informed the 3PID owner of your fraudulent attempt.");
}
throw new FeatureNotAvailable("Unbind using a 3PID session is not defined in the spec");
sessMgr.unbind(body);
writeBodyAsUtf8(exchange, "{}");
}
}