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Code Issues Releases Wiki Activity

Fix ImapStore$ImapConnection.authCramMD5()

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See Issue 4492

This method made way too many assumptions about server responses and
should not have been attempting to read and parse them.  That should be
left to ImapResponseParser.
This commit is contained in:
Joe Steele 2013-10-28 18:24:53 -04:00
parent 871ee1cc6c
commit 1d1b14da21
1 changed files with 18 additions and 40 deletions
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58
src/com/fsck/k9/mail/store/ImapStore.java
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@ -2693,47 +2693,25 @@ public class ImapStore extends Store {
ImapStore.encodeString(mSettings.getPassword())), true)); ImapStore.encodeString(mSettings.getPassword())), true));
} }
protected void authCramMD5() throws AuthenticationFailedException, MessagingException { protected void authCramMD5() throws MessagingException, IOException {
String command = "AUTHENTICATE CRAM-MD5";
String tag = sendCommand(command, false);
ImapResponse response = readContinuationResponse(tag);
if (response.size() != 1 || !(response.get(0) instanceof String)) {
throw new MessagingException("Invalid Cram-MD5 nonce received");
}
byte[] b64Nonce = response.getString(0).getBytes();
byte[] b64CRAM = Authentication.computeCramMd5Bytes(
mSettings.getUsername(), mSettings.getPassword(), b64Nonce);
mOut.write(b64CRAM);
mOut.write('\r');
mOut.write('\n');
mOut.flush();
try { try {
String tag = sendCommand("AUTHENTICATE CRAM-MD5", false); receiveCapabilities(readStatusResponse(tag, command, null));
byte[] buf = new byte[1024]; } catch (MessagingException e) {
int b64NonceLen = 0; throw new AuthenticationFailedException(e.getMessage());
for (int i = 0; i < buf.length; i++) {
buf[i] = (byte)mIn.read();
if (buf[i] == 0x0a) {
b64NonceLen = i;
break;
}
}
if (b64NonceLen == 0) {
throw new AuthenticationFailedException("Error negotiating CRAM-MD5: nonce too long.");
}
byte[] b64NonceTrim = new byte[b64NonceLen - 2];
System.arraycopy(buf, 1, b64NonceTrim, 0, b64NonceLen - 2);
byte[] b64CRAM = Authentication.computeCramMd5Bytes(mSettings.getUsername(),
mSettings.getPassword(), b64NonceTrim);
mOut.write(b64CRAM);
mOut.write(new byte[] { 0x0d, 0x0a });
mOut.flush();
int respLen = 0;
for (int i = 0; i < buf.length; i++) {
buf[i] = (byte)mIn.read();
if (buf[i] == 0x0a) {
respLen = i;
break;
}
}
String toMatch = tag + " OK";
String respStr = new String(buf, 0, respLen);
if (!respStr.startsWith(toMatch)) {
throw new AuthenticationFailedException("CRAM-MD5 error: " + respStr);
}
} catch (IOException ioe) {
throw new AuthenticationFailedException("CRAM-MD5 Auth Failed.", ioe);
} }
} }