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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.pm;
import com.android.server.pm.PackageManagerService.InstallArgs;
import android.content.pm.PackageManager;
import android.util.SparseBooleanArray;
/**
* Tracks the package verification state for a particular package. Each package
* verification has a required verifier and zero or more sufficient verifiers.
* Only one of the sufficient verifier list must return affirmative to allow the
* package to be considered verified. If there are zero sufficient verifiers,
* then package verification is considered complete.
*/
class PackageVerificationState {
private final InstallArgs mArgs;
private final SparseBooleanArray mSufficientVerifierUids;
private final int mRequiredVerifierUid;
private boolean mSufficientVerificationComplete;
private boolean mSufficientVerificationPassed;
private boolean mRequiredVerificationComplete;
private boolean mRequiredVerificationPassed;
private boolean mExtendedTimeout;
/**
* Create a new package verification state where {@code requiredVerifierUid}
* is the user ID for the package that must reply affirmative before things
* can continue.
*
* @param requiredVerifierUid user ID of required package verifier
* @param args
*/
public PackageVerificationState(int requiredVerifierUid, InstallArgs args) {
mRequiredVerifierUid = requiredVerifierUid;
mArgs = args;
mSufficientVerifierUids = new SparseBooleanArray();
mExtendedTimeout = false;
}
public InstallArgs getInstallArgs() {
return mArgs;
}
/**
* Add a verifier which is added to our sufficient list.
*
* @param uid user ID of sufficient verifier
*/
public void addSufficientVerifier(int uid) {
mSufficientVerifierUids.put(uid, true);
}
/**
* Should be called when a verification is received from an agent so the
* state of the package verification can be tracked.
*
* @param uid user ID of the verifying agent
* @return {@code true} if the verifying agent actually exists in our list
*/
public boolean setVerifierResponse(int uid, int code) {
if (uid == mRequiredVerifierUid) {
mRequiredVerificationComplete = true;
switch (code) {
case PackageManager.VERIFICATION_ALLOW_WITHOUT_SUFFICIENT:
mSufficientVerifierUids.clear();
// fall through
case PackageManager.VERIFICATION_ALLOW:
mRequiredVerificationPassed = true;
break;
default:
mRequiredVerificationPassed = false;
}
return true;
} else {
if (mSufficientVerifierUids.get(uid)) {
if (code == PackageManager.VERIFICATION_ALLOW) {
mSufficientVerificationComplete = true;
mSufficientVerificationPassed = true;
}
mSufficientVerifierUids.delete(uid);
if (mSufficientVerifierUids.size() == 0) {
mSufficientVerificationComplete = true;
}
return true;
}
}
return false;
}
/**
* Returns whether verification is considered complete. This means that the
* required verifier and at least one of the sufficient verifiers has
* returned a positive verification.
*
* @return {@code true} when verification is considered complete
*/
public boolean isVerificationComplete() {
if (!mRequiredVerificationComplete) {
return false;
}
if (mSufficientVerifierUids.size() == 0) {
return true;
}
return mSufficientVerificationComplete;
}
/**
* Returns whether installation should be allowed. This should only be
* called after {@link #isVerificationComplete()} returns {@code true}.
*
* @return {@code true} if installation should be allowed
*/
public boolean isInstallAllowed() {
if (!mRequiredVerificationPassed) {
return false;
}
if (mSufficientVerificationComplete) {
return mSufficientVerificationPassed;
}
return true;
}
/**
* Extend the timeout for this Package to be verified.
*/
public void extendTimeout() {
if (!mExtendedTimeout) {
mExtendedTimeout = true;
}
}
/**
* Returns whether the timeout was extended for verification.
*
* @return {@code true} if a timeout was already extended.
*/
public boolean timeoutExtended() {
return mExtendedTimeout;
}
}
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