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package org.sufficientlysecure.keychain.pgp.linked;
import android.content.Context;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.operations.results.LinkedVerifyResult;
import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
import org.sufficientlysecure.keychain.pgp.linked.resources.GenericHttpsResource;
import org.sufficientlysecure.keychain.pgp.linked.resources.UnknownResource;
import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
import org.sufficientlysecure.keychain.util.Log;
import java.net.URI;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public abstract class LinkedCookieResource {
protected final URI mSubUri;
protected final Set<String> mFlags;
protected final HashMap<String,String> mParams;
static Pattern magicPattern =
Pattern.compile("\\[Verifying my PGP key: openpgp4fpr:([a-zA-Z0-9]+)#([a-zA-Z0-9]+)\\]");
protected LinkedCookieResource(Set<String> flags, HashMap<String, String> params, URI uri) {
mFlags = flags;
mParams = params;
mSubUri = uri;
}
public Set<String> getFlags () {
return new HashSet<String>(mFlags);
}
public HashMap<String,String> getParams () {
return new HashMap<String,String>(mParams);
}
public URI toUri () {
StringBuilder b = new StringBuilder();
b.append("pgpid+cookie:");
// add flags
if (mFlags != null) {
boolean first = true;
for (String flag : mFlags) {
if (!first) {
b.append(";");
}
first = false;
b.append(flag);
}
}
// add parameters
if (mParams != null) {
boolean first = true;
for (Entry<String, String> stringStringEntry : mParams.entrySet()) {
if (!first) {
b.append(";");
}
first = false;
b.append(stringStringEntry.getKey()).append("=").append(stringStringEntry.getValue());
}
}
b.append("@");
b.append(mSubUri);
return URI.create(b.toString());
}
public URI getSubUri () {
return mSubUri;
}
public static String generate (Context context, byte[] fingerprint, String nonce) {
return "[Verifying my PGP key: openpgp4fpr:"
+ KeyFormattingUtils.convertFingerprintToHex(fingerprint) + "#" + nonce + "]";
}
public static String generatePreview () {
return "[Verifying my PGP key: openpgp4fpr:0x…]";
}
public LinkedVerifyResult verify(byte[] fingerprint, int nonce) {
OperationLog log = new OperationLog();
log.add(LogType.MSG_LV, 0);
// Try to fetch resource. Logs for itself
String res = fetchResource(log, 1);
if (res == null) {
// if this is null, an error was recorded in fetchResource above
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
Log.d(Constants.TAG, "Resource data: '" + res + "'");
return verifyString(log, 1, res, nonce, fingerprint);
}
protected abstract String fetchResource (OperationLog log, int indent);
protected Matcher matchResource (OperationLog log, int indent, String res) {
return magicPattern.matcher(res);
}
protected LinkedVerifyResult verifyString (OperationLog log, int indent,
String res,
int nonce, byte[] fingerprint) {
log.add(LogType.MSG_LV_MATCH, indent);
Matcher match = matchResource(log, indent+1, res);
if (!match.find()) {
log.add(LogType.MSG_LV_MATCH_ERROR, 2);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
String candidateFp = match.group(1).toLowerCase();
int nonceCandidate = Integer.parseInt(match.group(2).toLowerCase(), 16);
String fp = KeyFormattingUtils.convertFingerprintToHex(fingerprint);
if (!fp.equals(candidateFp)) {
log.add(LogType.MSG_LV_FP_ERROR, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
log.add(LogType.MSG_LV_FP_OK, indent);
if (nonce != nonceCandidate) {
log.add(LogType.MSG_LV_NONCE_ERROR, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_ERROR, log);
}
log.add(LogType.MSG_LV_NONCE_OK, indent);
return new LinkedVerifyResult(LinkedVerifyResult.RESULT_OK, log);
}
protected static LinkedCookieResource fromRawLinkedId (RawLinkedIdentity id) {
return fromUri(id.mNonce, id.mUri);
}
protected static LinkedCookieResource fromUri (int nonce, URI uri) {
if ("pgpid".equals(uri.getScheme())) {
Log.e(Constants.TAG, "unknown uri scheme in (suspected) linked id packet");
return null;
}
if (!uri.isOpaque()) {
Log.e(Constants.TAG, "non-opaque uri in (suspected) linked id packet");
return null;
}
String specific = uri.getSchemeSpecificPart();
if (!specific.contains("@")) {
Log.e(Constants.TAG, "unknown uri scheme in linked id packet");
return null;
}
String[] pieces = specific.split("@", 2);
URI subUri = URI.create(pieces[1]);
Set<String> flags = new HashSet<String>();
HashMap<String,String> params = new HashMap<String,String>();
{
String[] rawParams = pieces[0].split(";");
for (String param : rawParams) {
String[] p = param.split("=", 2);
if (p.length == 1) {
flags.add(param);
} else {
params.put(p[0], p[1]);
}
}
}
return findResourceType(nonce, flags, params, subUri);
}
protected static LinkedCookieResource findResourceType (int nonce, Set<String> flags,
HashMap<String,String> params,
URI subUri) {
LinkedCookieResource res;
res = GenericHttpsResource.create(flags, params, subUri);
if (res != null) {
return res;
}
return new UnknownResource(flags, params, subUri);
}
}
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