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Reject subkeys with no key flags and no primary key binding certificate

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Closes #899
This commit is contained in:
Vincent Breitmoser 2014-09-28 03:34:25 +02:00
parent 1a2ec1eb32
commit 1c3d0a58ea
1 changed files with 35 additions and 27 deletions
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62
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
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@ -616,43 +616,51 @@ public class UncachedKeyRing {
continue;
}
boolean needsPrimaryBinding = false;
// if this certificate says it allows signing for the key
if (zert.getHashedSubPackets() != null &&
zert.getHashedSubPackets().hasSubpacket(SignatureSubpacketTags.KEY_FLAGS)) {
int flags = ((KeyFlags) zert.getHashedSubPackets()
.getSubpacket(SignatureSubpacketTags.KEY_FLAGS)).getFlags();
if ((flags & PGPKeyFlags.CAN_SIGN) == PGPKeyFlags.CAN_SIGN) {
boolean ok = false;
// it MUST have an embedded primary key binding signature
try {
PGPSignatureList list = zert.getUnhashedSubPackets().getEmbeddedSignatures();
for (int i = 0; i < list.size(); i++) {
WrappedSignature subsig = new WrappedSignature(list.get(i));
if (subsig.getSignatureType() == PGPSignature.PRIMARYKEY_BINDING) {
subsig.init(key);
if (subsig.verifySignature(masterKey, key)) {
ok = true;
} else {
log.add(LogType.MSG_KC_SUB_PRIMARY_BAD, indent);
badCerts += 1;
continue uids;
}
needsPrimaryBinding = true;
}
} else {
// If there are no key flags, we STILL require this because the key can sign!
needsPrimaryBinding = true;
}
// If this key can sign, it MUST have a primary key binding certificate
if (needsPrimaryBinding) {
boolean ok = false;
if (zert.getUnhashedSubPackets() != null) try {
// Check all embedded signatures, if any of them fits
PGPSignatureList list = zert.getUnhashedSubPackets().getEmbeddedSignatures();
for (int i = 0; i < list.size(); i++) {
WrappedSignature subsig = new WrappedSignature(list.get(i));
if (subsig.getSignatureType() == PGPSignature.PRIMARYKEY_BINDING) {
subsig.init(key);
if (subsig.verifySignature(masterKey, key)) {
ok = true;
} else {
log.add(LogType.MSG_KC_SUB_PRIMARY_BAD, indent);
badCerts += 1;
continue uids;
}
}
} catch (Exception e) {
log.add(LogType.MSG_KC_SUB_PRIMARY_BAD_ERR, indent);
badCerts += 1;
continue;
}
// if it doesn't, get rid of this!
if (!ok) {
log.add(LogType.MSG_KC_SUB_PRIMARY_NONE, indent);
badCerts += 1;
continue;
}
} catch (Exception e) {
log.add(LogType.MSG_KC_SUB_PRIMARY_BAD_ERR, indent);
badCerts += 1;
continue;
}
// if it doesn't, get rid of this!
if (!ok) {
log.add(LogType.MSG_KC_SUB_PRIMARY_NONE, indent);
badCerts += 1;
continue;
}
}
// if we already have a cert, and this one is older: skip it