diff options
Diffstat (limited to 'src/main/java/de/thedevstack/conversationsplus/crypto/sasl')
6 files changed, 0 insertions, 525 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/DigestMd5.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/DigestMd5.java deleted file mode 100644 index f4c3f28e..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/DigestMd5.java +++ /dev/null @@ -1,91 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import android.util.Base64; - -import java.math.BigInteger; -import java.nio.charset.Charset; -import java.security.MessageDigest; -import java.security.NoSuchAlgorithmException; -import java.security.SecureRandom; - -import de.thedevstack.conversationsplus.entities.Account; -import de.thedevstack.conversationsplus.utils.CryptoHelper; -import de.thedevstack.conversationsplus.xml.TagWriter; - -public class DigestMd5 extends SaslMechanism { - public DigestMd5(final TagWriter tagWriter, final Account account, final SecureRandom rng) { - super(tagWriter, account, rng); - } - - @Override - public int getPriority() { - return 10; - } - - @Override - public String getMechanism() { - return "DIGEST-MD5"; - } - - private State state = State.INITIAL; - - @Override - public String getResponse(final String challenge) throws AuthenticationException { - switch (state) { - case INITIAL: - state = State.RESPONSE_SENT; - final String encodedResponse; - try { - final Tokenizer tokenizer = new Tokenizer(Base64.decode(challenge, Base64.DEFAULT)); - String nonce = ""; - for (final String token : tokenizer) { - final String[] parts = token.split("=", 2); - if (parts[0].equals("nonce")) { - nonce = parts[1].replace("\"", ""); - } else if (parts[0].equals("rspauth")) { - return ""; - } - } - final String digestUri = "xmpp/" + account.getServer(); - final String nonceCount = "00000001"; - final String x = account.getUsername() + ":" + account.getServer() + ":" - + account.getPassword(); - final MessageDigest md = MessageDigest.getInstance("MD5"); - final byte[] y = md.digest(x.getBytes(Charset.defaultCharset())); - final String cNonce = new BigInteger(100, rng).toString(32); - final byte[] a1 = CryptoHelper.concatenateByteArrays(y, - (":" + nonce + ":" + cNonce).getBytes(Charset.defaultCharset())); - final String a2 = "AUTHENTICATE:" + digestUri; - final String ha1 = CryptoHelper.bytesToHex(md.digest(a1)); - final String ha2 = CryptoHelper.bytesToHex(md.digest(a2.getBytes(Charset - .defaultCharset()))); - final String kd = ha1 + ":" + nonce + ":" + nonceCount + ":" + cNonce - + ":auth:" + ha2; - final String response = CryptoHelper.bytesToHex(md.digest(kd.getBytes(Charset - .defaultCharset()))); - final String saslString = "username=\"" + account.getUsername() - + "\",realm=\"" + account.getServer() + "\",nonce=\"" - + nonce + "\",cnonce=\"" + cNonce + "\",nc=" + nonceCount - + ",qop=auth,digest-uri=\"" + digestUri + "\",response=" - + response + ",charset=utf-8"; - encodedResponse = Base64.encodeToString( - saslString.getBytes(Charset.defaultCharset()), - Base64.NO_WRAP); - } catch (final NoSuchAlgorithmException e) { - throw new AuthenticationException(e); - } - - return encodedResponse; - case RESPONSE_SENT: - state = State.VALID_SERVER_RESPONSE; - break; - case VALID_SERVER_RESPONSE: - if (challenge==null) { - return null; //everything is fine - } - default: - throw new InvalidStateException(state); - } - return null; - } -} diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/External.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/External.java deleted file mode 100644 index dc50cbbe..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/External.java +++ /dev/null @@ -1,30 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import android.util.Base64; - -import java.security.SecureRandom; - -import de.thedevstack.conversationsplus.entities.Account; -import de.thedevstack.conversationsplus.xml.TagWriter; - -public class External extends SaslMechanism { - - public External(TagWriter tagWriter, Account account, SecureRandom rng) { - super(tagWriter, account, rng); - } - - @Override - public int getPriority() { - return 25; - } - - @Override - public String getMechanism() { - return "EXTERNAL"; - } - - @Override - public String getClientFirstMessage() { - return Base64.encodeToString(account.getJid().toBareJid().toString().getBytes(),Base64.NO_WRAP); - } -} diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Plain.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Plain.java deleted file mode 100644 index 179c12de..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Plain.java +++ /dev/null @@ -1,30 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import android.util.Base64; - -import java.nio.charset.Charset; - -import de.thedevstack.conversationsplus.entities.Account; -import de.thedevstack.conversationsplus.xml.TagWriter; - -public class Plain extends SaslMechanism { - public Plain(final TagWriter tagWriter, final Account account) { - super(tagWriter, account, null); - } - - @Override - public int getPriority() { - return 10; - } - - @Override - public String getMechanism() { - return "PLAIN"; - } - - @Override - public String getClientFirstMessage() { - final String sasl = '\u0000' + account.getUsername() + '\u0000' + account.getPassword(); - return Base64.encodeToString(sasl.getBytes(Charset.defaultCharset()), Base64.NO_WRAP); - } -} diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/SaslMechanism.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/SaslMechanism.java deleted file mode 100644 index 1f6d2bde..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/SaslMechanism.java +++ /dev/null @@ -1,62 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import java.security.SecureRandom; - -import de.thedevstack.conversationsplus.entities.Account; -import de.thedevstack.conversationsplus.xml.TagWriter; - -public abstract class SaslMechanism { - - final protected TagWriter tagWriter; - final protected Account account; - final protected SecureRandom rng; - - protected enum State { - INITIAL, - AUTH_TEXT_SENT, - RESPONSE_SENT, - VALID_SERVER_RESPONSE, - } - - public static class AuthenticationException extends Exception { - public AuthenticationException(final String message) { - super(message); - } - - public AuthenticationException(final Exception inner) { - super(inner); - } - } - - public static class InvalidStateException extends AuthenticationException { - public InvalidStateException(final String message) { - super(message); - } - - public InvalidStateException(final State state) { - this("Invalid state: " + state.toString()); - } - } - - public SaslMechanism(final TagWriter tagWriter, final Account account, final SecureRandom rng) { - this.tagWriter = tagWriter; - this.account = account; - this.rng = rng; - } - - /** - * The priority is used to pin the authentication mechanism. If authentication fails, it MAY be retried with another - * mechanism of the same priority, but MUST NOT be tried with a mechanism of lower priority (to prevent downgrade - * attacks). - * @return An arbitrary int representing the priority - */ - public abstract int getPriority(); - - public abstract String getMechanism(); - public String getClientFirstMessage() { - return ""; - } - public String getResponse(final String challenge) throws AuthenticationException { - return ""; - } -} diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/ScramSha1.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/ScramSha1.java deleted file mode 100644 index 3540d2cf..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/ScramSha1.java +++ /dev/null @@ -1,234 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import android.util.Base64; -import android.util.LruCache; - -import org.bouncycastle.crypto.Digest; -import org.bouncycastle.crypto.digests.SHA1Digest; -import org.bouncycastle.crypto.macs.HMac; -import org.bouncycastle.crypto.params.KeyParameter; - -import java.math.BigInteger; -import java.nio.charset.Charset; -import java.security.InvalidKeyException; -import java.security.SecureRandom; - -import de.thedevstack.conversationsplus.entities.Account; -import de.thedevstack.conversationsplus.utils.CryptoHelper; -import de.thedevstack.conversationsplus.xml.TagWriter; - -public class ScramSha1 extends SaslMechanism { - // TODO: When channel binding (SCRAM-SHA1-PLUS) is supported in future, generalize this to indicate support and/or usage. - final private static String GS2_HEADER = "n,,"; - private String clientFirstMessageBare; - final private String clientNonce; - private byte[] serverSignature = null; - private static HMac HMAC; - private static Digest DIGEST; - private static final byte[] CLIENT_KEY_BYTES = "Client Key".getBytes(); - private static final byte[] SERVER_KEY_BYTES = "Server Key".getBytes(); - - public static class KeyPair { - final public byte[] clientKey; - final public byte[] serverKey; - - public KeyPair(final byte[] clientKey, final byte[] serverKey) { - this.clientKey = clientKey; - this.serverKey = serverKey; - } - } - - private static final LruCache<String, KeyPair> CACHE; - - static { - DIGEST = new SHA1Digest(); - HMAC = new HMac(new SHA1Digest()); - CACHE = new LruCache<String, KeyPair>(10) { - protected KeyPair create(final String k) { - // Map keys are "bytesToHex(JID),bytesToHex(password),bytesToHex(salt),iterations". - // Changing any of these values forces a cache miss. `CryptoHelper.bytesToHex()' - // is applied to prevent commas in the strings breaking things. - final String[] kparts = k.split(",", 4); - try { - final byte[] saltedPassword, serverKey, clientKey; - saltedPassword = hi(CryptoHelper.hexToString(kparts[1]).getBytes(), - Base64.decode(CryptoHelper.hexToString(kparts[2]), Base64.DEFAULT), Integer.valueOf(kparts[3])); - serverKey = hmac(saltedPassword, SERVER_KEY_BYTES); - clientKey = hmac(saltedPassword, CLIENT_KEY_BYTES); - - return new KeyPair(clientKey, serverKey); - } catch (final InvalidKeyException | NumberFormatException e) { - return null; - } - } - }; - } - - private State state = State.INITIAL; - - public ScramSha1(final TagWriter tagWriter, final Account account, final SecureRandom rng) { - super(tagWriter, account, rng); - - // This nonce should be different for each authentication attempt. - clientNonce = new BigInteger(100, this.rng).toString(32); - clientFirstMessageBare = ""; - } - - @Override - public int getPriority() { - return 20; - } - - @Override - public String getMechanism() { - return "SCRAM-SHA-1"; - } - - @Override - public String getClientFirstMessage() { - if (clientFirstMessageBare.isEmpty() && state == State.INITIAL) { - clientFirstMessageBare = "n=" + CryptoHelper.saslEscape(CryptoHelper.saslPrep(account.getUsername())) + - ",r=" + this.clientNonce; - state = State.AUTH_TEXT_SENT; - } - return Base64.encodeToString( - (GS2_HEADER + clientFirstMessageBare).getBytes(Charset.defaultCharset()), - Base64.NO_WRAP); - } - - @Override - public String getResponse(final String challenge) throws AuthenticationException { - switch (state) { - case AUTH_TEXT_SENT: - if (challenge == null) { - throw new AuthenticationException("challenge can not be null"); - } - byte[] serverFirstMessage = Base64.decode(challenge, Base64.DEFAULT); - final Tokenizer tokenizer = new Tokenizer(serverFirstMessage); - String nonce = ""; - int iterationCount = -1; - String salt = ""; - for (final String token : tokenizer) { - if (token.charAt(1) == '=') { - switch (token.charAt(0)) { - case 'i': - try { - iterationCount = Integer.parseInt(token.substring(2)); - } catch (final NumberFormatException e) { - throw new AuthenticationException(e); - } - break; - case 's': - salt = token.substring(2); - break; - case 'r': - nonce = token.substring(2); - break; - case 'm': - /* - * RFC 5802: - * m: This attribute is reserved for future extensibility. In this - * version of SCRAM, its presence in a client or a server message - * MUST cause authentication failure when the attribute is parsed by - * the other end. - */ - throw new AuthenticationException("Server sent reserved token: `m'"); - } - } - } - - if (iterationCount < 0) { - throw new AuthenticationException("Server did not send iteration count"); - } - if (nonce.isEmpty() || !nonce.startsWith(clientNonce)) { - throw new AuthenticationException("Server nonce does not contain client nonce: " + nonce); - } - if (salt.isEmpty()) { - throw new AuthenticationException("Server sent empty salt"); - } - - final String clientFinalMessageWithoutProof = "c=" + Base64.encodeToString( - GS2_HEADER.getBytes(), Base64.NO_WRAP) + ",r=" + nonce; - final byte[] authMessage = (clientFirstMessageBare + ',' + new String(serverFirstMessage) + ',' - + clientFinalMessageWithoutProof).getBytes(); - - // Map keys are "bytesToHex(JID),bytesToHex(password),bytesToHex(salt),iterations". - final KeyPair keys = CACHE.get( - CryptoHelper.bytesToHex(account.getJid().toBareJid().toString().getBytes()) + "," - + CryptoHelper.bytesToHex(account.getPassword().getBytes()) + "," - + CryptoHelper.bytesToHex(salt.getBytes()) + "," - + String.valueOf(iterationCount) - ); - if (keys == null) { - throw new AuthenticationException("Invalid keys generated"); - } - final byte[] clientSignature; - try { - serverSignature = hmac(keys.serverKey, authMessage); - final byte[] storedKey = digest(keys.clientKey); - - clientSignature = hmac(storedKey, authMessage); - - } catch (final InvalidKeyException e) { - throw new AuthenticationException(e); - } - - final byte[] clientProof = new byte[keys.clientKey.length]; - - for (int i = 0; i < clientProof.length; i++) { - clientProof[i] = (byte) (keys.clientKey[i] ^ clientSignature[i]); - } - - - final String clientFinalMessage = clientFinalMessageWithoutProof + ",p=" + - Base64.encodeToString(clientProof, Base64.NO_WRAP); - state = State.RESPONSE_SENT; - return Base64.encodeToString(clientFinalMessage.getBytes(), Base64.NO_WRAP); - case RESPONSE_SENT: - final String clientCalculatedServerFinalMessage = "v=" + - Base64.encodeToString(serverSignature, Base64.NO_WRAP); - if (challenge == null || !clientCalculatedServerFinalMessage.equals(new String(Base64.decode(challenge, Base64.DEFAULT)))) { - throw new AuthenticationException("Server final message does not match calculated final message"); - } - state = State.VALID_SERVER_RESPONSE; - return ""; - default: - throw new InvalidStateException(state); - } - } - - public static synchronized byte[] hmac(final byte[] key, final byte[] input) - throws InvalidKeyException { - HMAC.init(new KeyParameter(key)); - HMAC.update(input, 0, input.length); - final byte[] out = new byte[HMAC.getMacSize()]; - HMAC.doFinal(out, 0); - return out; - } - - public static synchronized byte[] digest(byte[] bytes) { - DIGEST.reset(); - DIGEST.update(bytes, 0, bytes.length); - final byte[] out = new byte[DIGEST.getDigestSize()]; - DIGEST.doFinal(out, 0); - return out; - } - - /* - * Hi() is, essentially, PBKDF2 [RFC2898] with HMAC() as the - * pseudorandom function (PRF) and with dkLen == output length of - * HMAC() == output length of H(). - */ - private static synchronized byte[] hi(final byte[] key, final byte[] salt, final int iterations) - throws InvalidKeyException { - byte[] u = hmac(key, CryptoHelper.concatenateByteArrays(salt, CryptoHelper.ONE)); - byte[] out = u.clone(); - for (int i = 1; i < iterations; i++) { - u = hmac(key, u); - for (int j = 0; j < u.length; j++) { - out[j] ^= u[j]; - } - } - return out; - } -} diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Tokenizer.java b/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Tokenizer.java deleted file mode 100644 index cc2805de..00000000 --- a/src/main/java/de/thedevstack/conversationsplus/crypto/sasl/Tokenizer.java +++ /dev/null @@ -1,78 +0,0 @@ -package de.thedevstack.conversationsplus.crypto.sasl; - -import java.util.ArrayList; -import java.util.Arrays; -import java.util.Iterator; -import java.util.List; -import java.util.NoSuchElementException; - -/** - * A tokenizer for GS2 header strings - */ -public final class Tokenizer implements Iterator<String>, Iterable<String> { - private final List<String> parts; - private int index; - - public Tokenizer(final byte[] challenge) { - final String challengeString = new String(challenge); - parts = new ArrayList<>(Arrays.asList(challengeString.split(","))); - // Trim parts. - for (int i = 0; i < parts.size(); i++) { - parts.set(i, parts.get(i).trim()); - } - index = 0; - } - - /** - * Returns true if there is at least one more element, false otherwise. - * - * @see #next - */ - @Override - public boolean hasNext() { - return parts.size() != index + 1; - } - - /** - * Returns the next object and advances the iterator. - * - * @return the next object. - * @throws java.util.NoSuchElementException if there are no more elements. - * @see #hasNext - */ - @Override - public String next() { - if (hasNext()) { - return parts.get(index++); - } else { - throw new NoSuchElementException("No such element. Size is: " + parts.size()); - } - } - - /** - * Removes the last object returned by {@code next} from the collection. - * This method can only be called once between each call to {@code next}. - * - * @throws UnsupportedOperationException if removing is not supported by the collection being - * iterated. - * @throws IllegalStateException if {@code next} has not been called, or {@code remove} has - * already been called after the last call to {@code next}. - */ - @Override - public void remove() { - if(index <= 0) { - throw new IllegalStateException("You can't delete an element before first next() method call"); - } - parts.remove(--index); - } - - /** - * Returns an {@link java.util.Iterator} for the elements in this object. - * - * @return An {@code Iterator} instance. - */ - @Override - public Iterator<String> iterator() { - return parts.iterator(); - } -} |