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work on divert-to-key and other keyring stuff

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- allow modifySecretKeyRing operation without passphrase, but a only
  restricted subset of operations (ie, s2k strip/divert)
- pass byte array with serial number to key edit operation to initialize
  divert-to-card key
- update spongycastle to support serial numbers in iv for divert-to-card
This commit is contained in:
Vincent Breitmoser
2015-01-25 01:57:58 +01:00
parent fb2fa195bf
commit 1516f951b7
8 changed files with 166 additions and 19 deletions
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89
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperation.java
View File

@@ -20,7 +20,6 @@ package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.CompressionAlgorithmTags;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.bcpg.SymmetricKeyAlgorithmTags;
import org.spongycastle.bcpg.sig.Features;
import org.spongycastle.bcpg.sig.KeyFlags;
@@ -390,6 +389,9 @@ public class PgpKeyOperation {
* with a passphrase fails, the operation will fail with an unlocking error. More specific
* handling of errors should be done in UI code!
*
* If the passphrase is null, only a restricted subset of operations will be available,
* namely stripping of subkeys and changing the protection mode of dummy keys.
*
*/
public PgpEditKeyResult modifySecretKeyRing(CanonicalizedSecretKeyRing wsKR, SaveKeyringParcel saveParcel,
String passphrase) {
@@ -430,6 +432,11 @@ public class PgpKeyOperation {
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
// If we have no passphrase, only allow restricted operation
if (passphrase == null) {
return internalRestricted(sKR, saveParcel, log);
}
// read masterKeyFlags, and use the same as before.
// since this is the master key, this contains at least CERTIFY_OTHER
PGPPublicKey masterPublicKey = masterSecretKey.getPublicKey();
@@ -716,15 +723,18 @@ public class PgpKeyOperation {
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
if (change.mDummyStrip || change.mDummyDivert) {
if (change.mDummyStrip || change.mDummyDivert != null) {
// IT'S DANGEROUS~
// no really, it is. this operation irrevocably removes the private key data from the key
if (change.mDummyStrip) {
sKey = PGPSecretKey.constructGnuDummyKey(sKey.getPublicKey(),
S2K.GNU_PROTECTION_MODE_NO_PRIVATE_KEY);
sKey = PGPSecretKey.constructGnuDummyKey(sKey.getPublicKey());
} else {
sKey = PGPSecretKey.constructGnuDummyKey(sKey.getPublicKey(),
S2K.GNU_PROTECTION_MODE_DIVERT_TO_CARD);
// the serial number must be 16 bytes in length
if (change.mDummyDivert.length != 16) {
log.add(LogType.MSG_MF_ERROR_DIVERT_SERIAL,
indent + 1, KeyFormattingUtils.convertKeyIdToHex(change.mKeyId));
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
}
sKR = PGPSecretKeyRing.insertSecretKey(sKR, sKey);
}
@@ -932,6 +942,73 @@ public class PgpKeyOperation {
}
/** This method does the actual modifications in a keyring just like internal, except it
* supports only the subset of operations which require no passphrase, and will error
* otherwise.
*/
private PgpEditKeyResult internalRestricted(PGPSecretKeyRing sKR, SaveKeyringParcel saveParcel,
OperationLog log) {
int indent = 1;
progress(R.string.progress_modify, 0);
// Make sure the saveParcel includes only operations available without passphrae!
if (!saveParcel.isRestrictedOnly()) {
log.add(LogType.MSG_MF_ERROR_RESTRICTED, indent);
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
// Check if we were cancelled
if (checkCancelled()) {
log.add(LogType.MSG_OPERATION_CANCELLED, indent);
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_CANCELLED, log, null);
}
// The only operation we can do here:
// 4a. Strip secret keys, or change their protection mode (stripped/divert-to-card)
subProgressPush(50, 60);
for (int i = 0; i < saveParcel.mChangeSubKeys.size(); i++) {
progress(R.string.progress_modify_subkeychange, (i - 1) * (100 / saveParcel.mChangeSubKeys.size()));
SaveKeyringParcel.SubkeyChange change = saveParcel.mChangeSubKeys.get(i);
log.add(LogType.MSG_MF_SUBKEY_CHANGE,
indent, KeyFormattingUtils.convertKeyIdToHex(change.mKeyId));
PGPSecretKey sKey = sKR.getSecretKey(change.mKeyId);
if (sKey == null) {
log.add(LogType.MSG_MF_ERROR_SUBKEY_MISSING,
indent + 1, KeyFormattingUtils.convertKeyIdToHex(change.mKeyId));
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
if (change.mDummyStrip || change.mDummyDivert != null) {
// IT'S DANGEROUS~
// no really, it is. this operation irrevocably removes the private key data from the key
if (change.mDummyStrip) {
sKey = PGPSecretKey.constructGnuDummyKey(sKey.getPublicKey());
} else {
// the serial number must be 16 bytes in length
if (change.mDummyDivert.length != 16) {
log.add(LogType.MSG_MF_ERROR_DIVERT_SERIAL,
indent + 1, KeyFormattingUtils.convertKeyIdToHex(change.mKeyId));
return new PgpEditKeyResult(PgpEditKeyResult.RESULT_ERROR, log, null);
}
sKey = PGPSecretKey.constructGnuDummyKey(sKey.getPublicKey(), change.mDummyDivert);
}
sKR = PGPSecretKeyRing.insertSecretKey(sKR, sKey);
}
}
// And we're done!
progress(R.string.progress_done, 100);
log.add(LogType.MSG_MF_SUCCESS, indent);
return new PgpEditKeyResult(OperationResult.RESULT_OK, log, new UncachedKeyRing(sKR));
}
private static PGPSecretKeyRing applyNewUnlock(
PGPSecretKeyRing sKR,
PGPPublicKey masterPublicKey,

4
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
View File

@@ -20,7 +20,6 @@ package org.sufficientlysecure.keychain.pgp;
import org.spongycastle.bcpg.ArmoredOutputStream;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.bcpg.SignatureSubpacketTags;
import org.spongycastle.bcpg.UserAttributeSubpacketTags;
import org.spongycastle.bcpg.sig.KeyFlags;
@@ -1222,8 +1221,7 @@ public class UncachedKeyRing {
// if this is a secret key which does not yet occur in the secret ring
if (sKey == null) {
// generate a stripped secret (sub)key
sKey = PGPSecretKey.constructGnuDummyKey(key,
S2K.GNU_PROTECTION_MODE_NO_PRIVATE_KEY);
sKey = PGPSecretKey.constructGnuDummyKey(key);
}
sKey = PGPSecretKey.replacePublicKey(sKey, key);
return PGPSecretKeyRing.insertSecretKey(secRing, sKey);