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open-keychain
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work on divert-to-key and other keyring stuff 

- 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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53
OpenKeychain-Test/src/test/java/org/sufficientlysecure/keychain/pgp/PgpKeyOperationTest.java
View File

@ -702,7 +702,7 @@ public class PgpKeyOperationTest {
public void testSubkeyStrip() throws Exception {
long keyId = KeyringTestingHelper.getSubkeyId(ring, 1);
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, false));
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, null));
applyModificationWithChecks(parcel, ring, onlyA, onlyB);
Assert.assertEquals("one extra packet in original", 1, onlyA.size());
@ -728,7 +728,7 @@ public class PgpKeyOperationTest {
public void testMasterStrip() throws Exception {
long keyId = ring.getMasterKeyId();
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, false));
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, null));
applyModificationWithChecks(parcel, ring, onlyA, onlyB);
Assert.assertEquals("one extra packet in original", 1, onlyA.size());
@ -747,6 +747,44 @@ public class PgpKeyOperationTest {
Assert.assertEquals("new packet secret key data should have length zero",
0, ((SecretKeyPacket) p).getSecretKeyData().length);
Assert.assertNull("new packet should have no iv data", ((SecretKeyPacket) p).getIV());
}
@Test
public void testRestrictedStrip() throws Exception {
long keyId = KeyringTestingHelper.getSubkeyId(ring, 1);
UncachedKeyRing modified;
{ // we should be able to change the stripped/divert status of subkeys without passphrase
parcel.reset();
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, null));
modified = applyModificationWithChecks(parcel, ring, onlyA, onlyB, null);
Assert.assertEquals("one extra packet in modified", 1, onlyB.size());
Packet p = new BCPGInputStream(new ByteArrayInputStream(onlyB.get(0).buf)).readPacket();
Assert.assertEquals("new packet should have GNU_DUMMY S2K type",
S2K.GNU_DUMMY_S2K, ((SecretKeyPacket) p).getS2K().getType());
Assert.assertEquals("new packet should have GNU_DUMMY protection mode stripped",
S2K.GNU_PROTECTION_MODE_NO_PRIVATE_KEY, ((SecretKeyPacket) p).getS2K().getProtectionMode());
}
{ // and again, changing to divert-to-card
parcel.reset();
byte[] serial = new byte[] {
0x6a, 0x6f, 0x6c, 0x6f, 0x73, 0x77, 0x61, 0x67,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
parcel.mChangeSubKeys.add(new SubkeyChange(keyId, false, serial));
modified = applyModificationWithChecks(parcel, ring, onlyA, onlyB, null);
Assert.assertEquals("one extra packet in modified", 1, onlyB.size());
Packet p = new BCPGInputStream(new ByteArrayInputStream(onlyB.get(0).buf)).readPacket();
Assert.assertEquals("new packet should have GNU_DUMMY S2K type",
S2K.GNU_DUMMY_S2K, ((SecretKeyPacket) p).getS2K().getType());
Assert.assertEquals("new packet should have GNU_DUMMY protection mode divert-to-card",
S2K.GNU_PROTECTION_MODE_DIVERT_TO_CARD, ((SecretKeyPacket) p).getS2K().getProtectionMode());
Assert.assertArrayEquals("new packet should have correct serial number as iv",
serial, ((SecretKeyPacket) p).getIV());
}
}
@ -1093,6 +1131,17 @@ public class PgpKeyOperationTest {
}
@Test
public void testRestricted () throws Exception {
CanonicalizedSecretKeyRing secretRing = new CanonicalizedSecretKeyRing(ring.getEncoded(), false, 0);
parcel.mAddUserIds.add("discord");
PgpKeyOperation op = new PgpKeyOperation(null);
PgpEditKeyResult result = op.modifySecretKeyRing(secretRing, parcel, null);
Assert.assertFalse("non-restricted operations should fail without passphrase", result.success());
}
private static UncachedKeyRing applyModificationWithChecks(SaveKeyringParcel parcel,
UncachedKeyRing ring,
ArrayList<RawPacket> onlyA,

2
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/results/OperationResult.java
View File

@ -473,6 +473,7 @@ public abstract class OperationResult implements Parcelable {
// secret key modify
MSG_MF (LogLevel.START, R.string.msg_mr),
MSG_MF_ERROR_DIVERT_SERIAL (LogLevel.ERROR, R.string.msg_mf_error_divert_serial),
MSG_MF_ERROR_ENCODE (LogLevel.ERROR, R.string.msg_mf_error_encode),
MSG_MF_ERROR_FINGERPRINT (LogLevel.ERROR, R.string.msg_mf_error_fingerprint),
MSG_MF_ERROR_KEYID (LogLevel.ERROR, R.string.msg_mf_error_keyid),
@ -485,6 +486,7 @@ public abstract class OperationResult implements Parcelable {
MSG_MF_ERROR_PASSPHRASE_MASTER(LogLevel.ERROR, R.string.msg_mf_error_passphrase_master),
MSG_MF_ERROR_PAST_EXPIRY(LogLevel.ERROR, R.string.msg_mf_error_past_expiry),
MSG_MF_ERROR_PGP (LogLevel.ERROR, R.string.msg_mf_error_pgp),
MSG_MF_ERROR_RESTRICTED(LogLevel.ERROR, R.string.msg_mf_error_restricted),
MSG_MF_ERROR_REVOKED_PRIMARY (LogLevel.ERROR, R.string.msg_mf_error_revoked_primary),
MSG_MF_ERROR_SIG (LogLevel.ERROR, R.string.msg_mf_error_sig),
MSG_MF_ERROR_SUBKEY_MISSING(LogLevel.ERROR, R.string.msg_mf_error_subkey_missing),

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);

31
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/SaveKeyringParcel.java
View File

@ -80,6 +80,23 @@ public class SaveKeyringParcel implements Parcelable {
mRevokeSubKeys = new ArrayList<Long>();
}
/** Returns true iff this parcel does not contain any operations which require a passphrase. */
public boolean isRestrictedOnly() {
if (mNewUnlock != null || !mAddUserIds.isEmpty() || !mAddUserAttribute.isEmpty()
|| !mAddSubKeys.isEmpty() || mChangePrimaryUserId != null || !mRevokeSubKeys .isEmpty()
|| !mRevokeSubKeys.isEmpty()) {
return false;
}
for (SubkeyChange change : mChangeSubKeys) {
if (change.mRecertify || change.mFlags != null || change.mExpiry != null) {
return false;
}
}
return true;
}
// performance gain for using Parcelable here would probably be negligible,
// use Serializable instead.
public static class SubkeyAdd implements Serializable {
@ -114,12 +131,14 @@ public class SaveKeyringParcel implements Parcelable {
public Integer mFlags;
// this is a long unix timestamp, in seconds (NOT MILLISECONDS!)
public Long mExpiry;
// if this flag is true, the key will be recertified even if all above
// values are no-ops
public boolean mRecertify;
// if this flag is true, the subkey should be changed to a stripped key
public boolean mDummyStrip;
// if this flag is true, the subkey should be changed to a divert-to-card key
public boolean mDummyDivert;
// if this flag is true, the key will be recertified even if the above values are no-ops
public boolean mRecertify;
// if this is non-null, the subkey will be changed to a divert-to-card
// key for the given serial number
public byte[] mDummyDivert;
public SubkeyChange(long keyId) {
mKeyId = keyId;
@ -136,11 +155,11 @@ public class SaveKeyringParcel implements Parcelable {
mExpiry = expiry;
}
public SubkeyChange(long keyId, boolean dummyStrip, boolean dummyDivert) {
public SubkeyChange(long keyId, boolean dummyStrip, byte[] dummyDivert) {
this(keyId, null, null);
// these flags are mutually exclusive!
if (dummyStrip && dummyDivert) {
if (dummyStrip && dummyDivert != null) {
throw new AssertionError(
"cannot set strip and divert flags at the same time - this is a bug!");
}

2
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EditKeyFragment.java
View File

@ -481,7 +481,7 @@ public class EditKeyFragment extends LoaderFragment implements
case EditSubkeyDialogFragment.MESSAGE_STRIP:
SubkeyChange change = mSaveKeyringParcel.getSubkeyChange(keyId);
if (change == null) {
mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, false));
mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId, true, null));
break;
}
// toggle

2
OpenKeychain/src/main/res/values/strings.xml
View File

@ -826,6 +826,7 @@
<!-- modifySecretKeyRing -->
<string name="msg_mr">"Modifying keyring %s"</string>
<string name="msg_mf_error_divert_serial">"The serial number of a divert-to-card key must be 16 bytes! This is a programming error, please file a bug report!"</string>
<string name="msg_mf_error_encode">"Encoding exception!"</string>
<string name="msg_mf_error_fingerprint">"Actual key fingerprint does not match the expected one!"</string>
<string name="msg_mf_error_keyid">"No key ID. This is an internal error, please file a bug report!"</string>
@ -833,6 +834,7 @@
<string name="msg_mf_error_master_none">"No master certificate found to operate on! (All revoked?)"</string>
<string name="msg_mf_error_noexist_primary">"Bad primary user ID specified!"</string>
<string name="msg_mf_error_noexist_revoke">"Bad user ID for revocation specified!"</string>
<string name="msg_mf_error_restricted">"Tried to execute restricted operation without passphrase! This is a programming error, please file a bug report!"</string>
<string name="msg_mf_error_revoked_primary">"Revoked user IDs cannot be primary!"</string>
<string name="msg_mf_error_null_expiry">"Expiry time cannot be "same as before" on subkey creation. This is a programming error, please file a bug report!"</string>
<string name="msg_mf_error_passphrase_master">"Fatal error decrypting master key! This is likely a programming error, please file a bug report!"</string>

2
extern/spongycastle vendored

@ -1 +1 @@
Subproject commit c2a91166cef1a08c97ad2e988e368fe36babfc05
Subproject commit 26c232f31b62404ecb5d3ae3d2c1730fd0a0a0eb