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Apply unknown-keyshare mitigations

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Now that the mobile clients have been updated to send the right fields, enforce
their correctness on the recipient side.
This commit is contained in:
Richard van der Hoff
2016-11-16 22:39:08 +00:00
parent 749f53a22b
commit f6830992ea
1 changed files with 3 additions and 19 deletions
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22
lib/crypto/algorithms/olm.js
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@@ -186,13 +186,7 @@ OlmDecryption.prototype.decryptEvent = function(event) {
// check that we were the intended recipient, to avoid unknown-key attack
// https://github.com/vector-im/vector-web/issues/2483
if (payload.recipient === undefined) {
// older versions of riot did not set this field, so we cannot make
// this check. TODO: kill this off once our users have updated
console.warn(
"Olm event (id=" + event.getId() + ") contains no 'recipient' " +
"property; cannot prevent unknown-key attack");
} else if (payload.recipient != this._userId) {
if (payload.recipient != this._userId) {
console.warn(
"Event " + event.getId() + ": Intended recipient " +
payload.recipient + " does not match our id " + this._userId
@@ -202,12 +196,7 @@ OlmDecryption.prototype.decryptEvent = function(event) {
);
}
if (payload.recipient_keys === undefined) {
// ditto
console.warn(
"Olm event (id=" + event.getId() + ") contains no " +
"'recipient_keys' property; cannot prevent unknown-key attack");
} else if (payload.recipient_keys.ed25519 !=
if (payload.recipient_keys.ed25519 !=
this._olmDevice.deviceEd25519Key) {
console.warn(
"Event " + event.getId() + ": Intended recipient ed25519 key " +
@@ -220,12 +209,7 @@ OlmDecryption.prototype.decryptEvent = function(event) {
// avoid people masquerading as others.
// (this check is also provided via the sender's embedded ed25519 key,
// which is checked elsewhere).
if (payload.sender === undefined) {
// ditto
console.warn(
"Olm event (id=" + event.getId() + ") contains no " +
"'sender' property; cannot prevent unknown-key attack");
} else if (payload.sender != event.getSender()) {
if (payload.sender != event.getSender()) {
console.warn(
"Event " + event.getId() + ": original sender " + payload.sender +
" does not match reported sender " + event.getSender()