public override object Deserialize(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
using (var reader = new StreamReader(stream)) {
var line = reader.ReadLine();
line = line.Trim();
var algoName = new string(line.TakeWhile(c => !char.IsWhiteSpace(c)).ToArray());
line = line.Substring(algoName.Length).Trim();
var data = new string(line.TakeWhile(c => !char.IsWhiteSpace(c)).ToArray());
line = line.Substring(data.Length).Trim();
var comment = line;
PublicKeyAlgorithm algo;
if (!TryParsePublicKeyAlgorithm(algoName, out algo))
{
var message = string.Format("Unknown algorithm: {0}", algoName);
throw new KeyFormatterException(message);
}
var parser = new BlobParser(Util.FromBase64(data));
OpensshCertificate cert;
var publicKeyParams = parser.ReadSsh2PublicKeyData(out cert);
var key = new SshKey(SshVersion.SSH2, publicKeyParams, null, comment, cert);
return(key);
}
}
static AgentClientTest()
{
rsa1Key = KeyGenerator.CreateKey(SshVersion.SSH1,
PublicKeyAlgorithm.SSH_RSA, "SSH1 RSA test key");
rsaKey = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.SSH_RSA, "SSH2 RSA test key");
dsaKey = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.SSH_DSS, "SSH2 DSA test key");
ecdsa256Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP256, "SSH2 ECDSA 256 test key");
ecdsa384Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP384, "SSH2 ECDSA 384 test key");
ecdsa521Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP521, "SSH2 ECDSA 521 test key");
ed25519Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ED25519, "SSH2 Ed25519 test key");
List<SshKey> keyList = new List<SshKey>();
keyList.Add(rsa1Key);
keyList.Add(rsaKey);
keyList.Add(dsaKey);
keyList.Add(ecdsa256Key);
keyList.Add(ecdsa384Key);
keyList.Add(ecdsa521Key);
keyList.Add(ed25519Key);
allKeys = keyList.AsReadOnly();
}
public SshKey Clone()
{
AsymmetricCipherKeyPair keyPair = new AsymmetricCipherKeyPair(
GetPublicKeyParameters(), GetPrivateKeyParameters());
SshKey newKey = new SshKey(Version, keyPair, Comment);
newKey.Source = Source;
foreach (Agent.KeyConstraint constraint in keyConstraints)
{
newKey.AddConstraint(constraint);
}
return(newKey);
}
public void TestFormatSignature()
{
var random = new Random();
var dsa_key = new SshKey(SshVersion.SSH2, new DsaPublicKeyParameters (
new BigInteger ("1"),
new DsaParameters(new BigInteger ("2"), new BigInteger ("3"),
new BigInteger ("4"))));
// test that dsa signature works when values are not full 20 bytes.
byte[] r_bytes = new byte[19];
byte[] s_bytes = new byte[19];
random.NextBytes(r_bytes);
random.NextBytes(s_bytes);
var r = new DerInteger(r_bytes);
var s = new DerInteger(s_bytes);
var sequence = new DerSequence(r, s);
var signature = dsa_key.FormatSignature(sequence.GetEncoded());
Assert.That(signature.Count(), Is.EqualTo(40));
}
public override object Deserialize(Stream aStream)
{
/* check for required parameters */
if (aStream == null) {
throw new ArgumentNullException("aStream");
}
/* reading unencrypted part */
BlobParser parser = new BlobParser(aStream);
parser.ReadBytes((uint)FILE_HEADER_LINE.Length + 2); //Skipping header line
byte cipherType = parser.ReadByte();
if (cipherType != SSH_CIPHER_3DES && cipherType != SSH_CIPHER_NONE) {
//TripleDes is the only encryption supported
throw new KeyFormatterException("Unsupported cypherType: " + cipherType);
}
parser.ReadInt(); //reserved
/* reading public key */
AsymmetricKeyParameter aPublicKeyParameter =
parser.ReadSsh1PublicKeyData(false);
String keyComment = parser.ReadString();
/* reading private key */
byte[] inputBuffer = new byte[aStream.Length];
aStream.Read(inputBuffer, 0, inputBuffer.Length);
byte[] ouputBuffer;
try {
if (cipherType == 3) {
/* private key is 3DES encrypted */
PasswordFinder pwFinder = null;
if (GetPassphraseCallbackMethod != null) {
pwFinder = new PasswordFinder(GetPassphraseCallbackMethod);
}
byte[] keydata;
try {
using (MD5 md5 = MD5.Create()) {
char[] md5Buffer = pwFinder.GetPassword();
keydata = md5.ComputeHash(Encoding.ASCII.GetBytes(md5Buffer));
}
} catch (PasswordException ex) {
if (GetPassphraseCallbackMethod == null) {
throw new CallbackNullException();
}
throw new KeyFormatterException("see inner exception", ex);
}
/* decryption */
DesSsh1Engine desEngine = new DesSsh1Engine();
desEngine.Init(false, new KeyParameter(keydata));
BufferedBlockCipher bufferedBlockCipher = new BufferedBlockCipher(desEngine);
ouputBuffer = bufferedBlockCipher.ProcessBytes(inputBuffer);
} else {
/* private key is stored in plain text */
ouputBuffer = inputBuffer;
}
var privateKeyParser = new BlobParser(ouputBuffer);
/* checking result of decryption */
byte[] resultCheck = privateKeyParser.ReadBytes(4);
if (resultCheck[0] != resultCheck[2] || resultCheck[1] != resultCheck[3]) {
throw new KeyFormatterException("bad passphrase");
}
/* reading private key */
var keyPair = privateKeyParser.ReadSsh1KeyData(aPublicKeyParameter);
SshKey key = new SshKey(SshVersion.SSH1, keyPair);
key.Comment = keyComment;
return key;
} catch (KeyFormatterException) {
throw;
} catch (Exception ex) {
throw new KeyFormatterException("see inner exception", ex);
}
}
public override object Deserialize(Stream stream)
{
/* check for required parameters */
if (stream == null)
{
throw new ArgumentNullException("stream");
}
try {
var reader = new StreamReader(stream);
var firstLine = reader.ReadLine();
if (firstLine != MARK_BEGIN)
{
throw new KeyFormatterException("Bad file format - does not have expected header.");
}
var base64String = new StringBuilder();
while (true)
{
var line = reader.ReadLine();
if (line == MARK_END)
{
break;
}
base64String.Append(line);
}
/* reading unencrypted part */
BlobParser parser = new BlobParser(Util.FromBase64(base64String.ToString()));
var magicBytes = parser.ReadBytes((uint)AUTH_MAGIC.Length);
if (Encoding.UTF8.GetString(magicBytes) != AUTH_MAGIC)
{
throw new KeyFormatterException("Bad data - missing AUTH_MAGIC.");
}
var ciphername = parser.ReadString();
if (!IsSupportCipher(ciphername))
{
throw new KeyFormatterException("Unsupported cyphername: " + ciphername);
}
var kdfname = parser.ReadString();
if (kdfname != KDFNAME_BCRYPT && kdfname != KDFNAME_NONE)
{
throw new KeyFormatterException("Unsupported kdfname: " + ciphername);
}
if (kdfname == KDFNAME_NONE && ciphername != CIPHERNAME_NONE)
{
throw new KeyFormatterException("Invalid format.");
}
var kdfoptions = parser.ReadBlob();
var keyCount = parser.ReadUInt32();
if (keyCount != 1)
{
throw new KeyFormatterException("Only one key allowed.");
}
var publicKeys = new List <byte[]>();
for (int i = 0; i < keyCount; i++)
{
publicKeys.Add(parser.ReadBlob());
}
var privateKeys = parser.ReadBlob();
var keyAndIV = new byte[32 + 16];
if (kdfname == KDFNAME_BCRYPT)
{
var kdfOptionsParser = new BlobParser(kdfoptions);
var salt = kdfOptionsParser.ReadBlob();
var rounds = kdfOptionsParser.ReadUInt32();
var passphrase = GetPassphraseCallbackMethod(null);
var passphraseChars = new char[passphrase.Length];
var passphrasePtr = Marshal.SecureStringToGlobalAllocUnicode(passphrase);
for (int i = 0; i < passphrase.Length; i++)
{
passphraseChars[i] = (char)Marshal.ReadInt16(passphrasePtr, i * 2);
}
Marshal.ZeroFreeGlobalAllocUnicode(passphrasePtr);
BCrypt.HashUsingOpensshBCryptPbkdf(passphraseChars, salt, ref keyAndIV, rounds);
Array.Clear(passphraseChars, 0, passphraseChars.Length);
}
var key = new byte[32];
Array.Copy(keyAndIV, key, key.Length);
var iv = new byte[16];
Array.Copy(keyAndIV, key.Length, iv, 0, iv.Length);
switch (ciphername)
{
case CIPHERNAME_AES256_CBC:
var aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
aes.Key = key;
aes.IV = iv;
if (privateKeys.Length < aes.BlockSize / 8 || privateKeys.Length % (aes.BlockSize / 8) != 0)
{
throw new KeyFormatterException("Bad private key encrypted length.");
}
using (ICryptoTransform decryptor = aes.CreateDecryptor()) {
privateKeys = Util.GenericTransform(decryptor, privateKeys);
}
aes.Clear();
break;
case CIPHERNAME_AES256_CTR:
var ctrCipher = CipherUtilities.GetCipher("AES/CTR/NoPadding");
ctrCipher.Init(false, new ParametersWithIV(new KeyParameter(key), iv));
privateKeys = ctrCipher.DoFinal(privateKeys);
break;
}
parser = new BlobParser(privateKeys);
var checkint1 = parser.ReadUInt32();
var checkint2 = parser.ReadUInt32();
if (checkint1 != checkint2)
{
throw new KeyFormatterException("checkint does not match in private key.");
}
var keys = new List <SshKey>();
for (int i = 0; i < keyCount; i++)
{
OpensshCertificate cert;
var publicKey = parser.ReadSsh2PublicKeyData(out cert);
var keyPair = parser.ReadSsh2KeyData(publicKey);
var comment = parser.ReadString();
var sshKey = new SshKey(SshVersion.SSH2, keyPair, comment, cert);
keys.Add(sshKey);
}
return(keys[0]);
} catch (KeyFormatterException) {
throw;
} catch (Exception ex) {
throw new KeyFormatterException("see inner exception", ex);
}
}
/// <summary>
/// Answers the message.
/// </summary>
/// <param name='messageStream'>Message stream.</param>
/// <param name="process">The calling process or <c>null</c> if the process
/// could not be obtained.</param>
/// <remarks>code based on winpgnt.c from PuTTY source code</remarks>
public void AnswerMessage(Stream messageStream, Process process = null)
{
if (messageStream.CanTimeout)
{
messageStream.ReadTimeout = 5000;
}
var messageParser = new BlobParser(messageStream);
var responseBuilder = new BlobBuilder();
BlobHeader header;
try {
header = messageParser.ReadHeader();
if (MessageReceived != null)
{
var eventArgs = new MessageReceivedEventArgs(header);
MessageReceived(this, eventArgs);
if (eventArgs.Fail)
{
throw new Exception();
}
}
} catch (Exception) {
header = new BlobHeader();
header.Message = Message.UNKNOWN;
// this will cause the switch statement below to use the default case
// which returns an error to the stream.
}
switch (header.Message)
{
case Message.SSH1_AGENTC_REQUEST_RSA_IDENTITIES:
/*
* Reply with SSH1_AGENT_RSA_IDENTITIES_ANSWER.
*/
try {
if (header.BlobLength > 1)
{
// ruby net-ssh tries to send a SSH2_AGENT_REQUEST_VERSION message
// which has the same id number as SSH1_AGENTC_REQUEST_RSA_IDENTITIES
// with a string tacked on. We need to read the string from the
// stream, but it is not used for anything.
messageParser.ReadString();
}
var keyList = ListKeys(SshVersion.SSH1);
if (FilterKeyListCallback != null)
{
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList)
{
responseBuilder.AddBytes(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_REQUEST_IDENTITIES:
/*
* Reply with SSH2_AGENT_IDENTITIES_ANSWER.
*/
try {
var keyList = ListKeys(SshVersion.SSH2);
if (FilterKeyListCallback != null)
{
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList)
{
responseBuilder.AddBlob(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH2_AGENT_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_RSA_CHALLENGE:
/*
* Reply with either SSH1_AGENT_RSA_RESPONSE or
* SSH_AGENT_FAILURE, depending on whether we have that key
* or not.
*/
try {
//Reading publicKey information
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(true);
//Searching for Key here
var matchingKey = mKeyList.Where(key => key.Version == SshVersion.SSH1 &&
(key.GetPublicKeyParameters().Equals(publicKeyParams))).Single();
//Reading challenge
var encryptedChallenge = messageParser.ReadSsh1BigIntBlob();
var sessionId = messageParser.ReadBytes(16);
//Checking responseType field
if (messageParser.ReadUInt32() != 1)
{
goto default; //responseType !=1 is not longer supported
}
//Answering to the challenge
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(false /* decrypt */, matchingKey.GetPrivateKeyParameters());
var decryptedChallenge = engine.ProcessBlock(encryptedChallenge,
0, encryptedChallenge.Length);
using (MD5 md5 = MD5.Create()) {
var md5Buffer = new byte[48];
decryptedChallenge.CopyTo(md5Buffer, 0);
sessionId.CopyTo(md5Buffer, 32);
responseBuilder.AddBytes(md5.ComputeHash(md5Buffer));
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_RESPONSE);
break;
}
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_SIGN_REQUEST:
/*
* Reply with either SSH2_AGENT_SIGN_RESPONSE or SSH_AGENT_FAILURE,
* depending on whether we have that key or not.
*/
try {
var keyBlob = messageParser.ReadBlob();
var reqData = messageParser.ReadBlob();
var flags = new SignRequestFlags();
try {
// usually, there are no flags, so parser will throw
flags = (SignRequestFlags)messageParser.ReadUInt32();
} catch { }
var matchingKey =
mKeyList.Where(key => key.Version == SshVersion.SSH2 &&
key.GetPublicKeyBlob().SequenceEqual(keyBlob)).First();
var confirmConstraints = matchingKey.Constraints
.Where(constraint => constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_CONFIRM);
if (confirmConstraints.Count() > 0)
{
if (!ConfirmUserPermissionCallback.Invoke(matchingKey, process))
{
goto default;
}
}
/* create signature */
var signKey = matchingKey;
var signer = signKey.GetSigner();
var algName = signKey.Algorithm.GetIdentifierString();
signer.Init(true, signKey.GetPrivateKeyParameters());
signer.BlockUpdate(reqData, 0, reqData.Length);
byte[] signature = signer.GenerateSignature();
signature = signKey.FormatSignature(signature);
BlobBuilder signatureBuilder = new BlobBuilder();
if (!flags.HasFlag(SignRequestFlags.SSH_AGENT_OLD_SIGNATURE))
{
signatureBuilder.AddStringBlob(algName);
}
signatureBuilder.AddBlob(signature);
responseBuilder.AddBlob(signatureBuilder.GetBlob());
responseBuilder.InsertHeader(Message.SSH2_AGENT_SIGN_RESPONSE);
try {
KeyUsed(this, new KeyUsedEventArgs(signKey, process));
} catch { }
break; // succeeded
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failure
case Message.SSH1_AGENTC_ADD_RSA_IDENTITY:
case Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked)
{
goto default;
}
bool ssh1constrained = (header.Message == Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED);
try {
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(false);
var keyPair = messageParser.ReadSsh1KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH1, keyPair);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (ssh1constrained)
{
while (messageStream.Position < header.BlobLength + 4)
{
KeyConstraint constraint = new KeyConstraint();
constraint.Type = (KeyConstraintType)messageParser.ReadUInt8();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME)
{
constraint.Data = messageParser.ReadUInt32();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_ADD_IDENTITY:
case Message.SSH2_AGENTC_ADD_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked)
{
goto default;
}
bool constrained = (header.Message ==
Message.SSH2_AGENTC_ADD_ID_CONSTRAINED);
try {
OpensshCertificate cert;
var publicKeyParams = messageParser.ReadSsh2PublicKeyData(out cert);
var keyPair = messageParser.ReadSsh2KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH2, keyPair, null, cert);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (constrained)
{
while (messageStream.Position < header.BlobLength + 4)
{
KeyConstraint constraint = new KeyConstraint();
constraint.Type =
(KeyConstraintType)messageParser.ReadUInt8();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME)
{
constraint.Data = messageParser.ReadUInt32();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; // success!
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY:
case Message.SSH2_AGENTC_REMOVE_IDENTITY:
/*
* Remove from the list and return SSH_AGENT_SUCCESS, or
* perhaps SSH_AGENT_FAILURE if it wasn't in the list to
* start with.
*/
if (IsLocked)
{
goto default;
}
SshVersion removeVersion;
byte[] rKeyBlob;
if (header.Message == Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY)
{
removeVersion = SshVersion.SSH1;
rKeyBlob = messageParser.ReadBytes(header.BlobLength - 1);
}
else if (header.Message == Message.SSH2_AGENTC_REMOVE_IDENTITY)
{
removeVersion = SshVersion.SSH2;
rKeyBlob = messageParser.ReadBlob();
}
else
{
Debug.Fail("Should not get here.");
goto default;
}
try {
var matchingKey = mKeyList.Get(removeVersion, rKeyBlob);
var startKeyListLength = mKeyList.Count;
RemoveKey(matchingKey);
// only succeed if key was removed
if (mKeyList.Count == startKeyListLength - 1)
{
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
}
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
case Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
/*
* Remove all SSH-1 or SSH-2 keys.
*/
if (IsLocked)
{
goto default;
}
SshVersion removeAllVersion;
if (header.Message == Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES)
{
removeAllVersion = SshVersion.SSH1;
}
else if (header.Message == Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES)
{
removeAllVersion = SshVersion.SSH2;
}
else
{
Debug.Fail("Should not get here.");
goto default;
}
try {
RemoveAllKeys(removeAllVersion);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH_AGENTC_LOCK:
try {
var passphrase = new PinnedArray <byte>(messageParser.ReadBlob());
try {
Lock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (IsLocked)
{
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
case Message.SSH_AGENTC_UNLOCK:
try {
var passphrase = new PinnedArray <byte>(messageParser.ReadBlob());
try {
Unlock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (!IsLocked)
{
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (PassphraseException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
default:
responseBuilder.Clear();
responseBuilder.InsertHeader(Message.SSH_AGENT_FAILURE);
break;
}
/* write response to stream */
if (messageStream.CanSeek)
{
messageStream.Position = 0;
}
messageStream.Write(responseBuilder.GetBlob(), 0, responseBuilder.Length);
messageStream.Flush();
}
public override object Deserialize(Stream stream)
{
/* check for required parameters */
if (stream == null) {
throw new ArgumentNullException("stream");
}
try {
var reader = new StreamReader(stream);
var firstLine = reader.ReadLine();
if (firstLine != MARK_BEGIN) {
throw new KeyFormatterException("Bad file format - does not have expected header.");
}
var base64String = new StringBuilder();
while (true) {
var line = reader.ReadLine();
if (line == MARK_END) {
break;
}
base64String.Append(line);
}
/* reading unencrypted part */
BlobParser parser = new BlobParser(Util.FromBase64(base64String.ToString()));
var magicBytes = parser.ReadBytes((uint)AUTH_MAGIC.Length);
if (Encoding.UTF8.GetString(magicBytes) != AUTH_MAGIC) {
throw new KeyFormatterException("Bad data - missing AUTH_MAGIC.");
}
var ciphername = parser.ReadString();
if (ciphername != CIPHERNAME_AES256_CBC && ciphername != CIPHERNAME_NONE) {
throw new KeyFormatterException("Unsupported cyphername: " + ciphername);
}
var kdfname = parser.ReadString();
if (kdfname != KDFNAME_BCRYPT && kdfname != KDFNAME_NONE) {
throw new KeyFormatterException("Unsupported kdfname: " + ciphername);
}
if (kdfname == KDFNAME_NONE && ciphername != CIPHERNAME_NONE) {
throw new KeyFormatterException("Invalid format.");
}
var kdfoptions = parser.ReadBlob();
var keyCount = parser.ReadInt();
if (keyCount != 1) {
throw new KeyFormatterException("Only one key allowed.");
}
var publicKeys = new List<byte[]>();
for (int i = 0; i < keyCount; i++) {
publicKeys.Add(parser.ReadBlob());
}
var privateKeys = parser.ReadBlob();
if (ciphername == CIPHERNAME_AES256_CBC) {
Aes aes = Aes.Create();
aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
if (privateKeys.Length < aes.BlockSize / 8 || privateKeys.Length % (aes.BlockSize / 8) != 0) {
throw new KeyFormatterException("Bad private key encrypted length.");
}
var keyAndIV = new byte[aes.Key.Length + aes.IV.Length];
if (kdfname == KDFNAME_BCRYPT) {
var kdfOptionsParser = new BlobParser(kdfoptions);
var salt = kdfOptionsParser.ReadBlob();
var rounds = kdfOptionsParser.ReadInt();
var passphrase = GetPassphraseCallbackMethod(null);
var passphraseChars = new char[passphrase.Length];
IntPtr passphrasePtr = Marshal.SecureStringToGlobalAllocUnicode(passphrase);
for (int i = 0; i < passphrase.Length; i++) {
passphraseChars[i] = (char)Marshal.ReadInt16(passphrasePtr, i * 2);
}
Marshal.ZeroFreeGlobalAllocUnicode(passphrasePtr);
BCrypt.HashUsingOpensshBCryptPbkdf(passphraseChars, salt, ref keyAndIV, rounds);
Array.Clear(passphraseChars, 0, passphraseChars.Length);
}
// Array.Copy to aes.Key and aes.IV directly does not work!
var key = new byte[aes.Key.Length];
Array.Copy(keyAndIV, key, key.Length);
aes.Key = key;
var iv = new byte[aes.IV.Length];
Array.Copy(keyAndIV, key.Length, iv, 0, iv.Length);
aes.IV = iv;
using (ICryptoTransform decryptor = aes.CreateDecryptor()) {
privateKeys = Util.GenericTransform(decryptor, privateKeys);
}
aes.Clear();
}
parser = new BlobParser(privateKeys);
var checkint1 = parser.ReadInt();
var checkint2 = parser.ReadInt();
if (checkint1 != checkint2) {
throw new KeyFormatterException("checkint does not match in private key.");
}
var keys = new List<SshKey>();
for (int i = 0; i < keyCount; i++) {
var publicKey = parser.ReadSsh2PublicKeyData();
var keyPair = parser.ReadSsh2KeyData(publicKey);
var comment = parser.ReadString();
var key = new SshKey(SshVersion.SSH2, keyPair, comment);
keys.Add(key);
}
return keys[0];
} catch (KeyFormatterException) {
throw;
} catch (Exception ex) {
throw new KeyFormatterException("see inner exception", ex);
}
}
/// <summary>
/// Answers the message.
/// </summary>
/// <param name='messageStream'>Message stream.</param>
/// <param name="process">The calling process or <c>null</c> if the process
/// could not be obtained.</param>
/// <remarks>code based on winpgnt.c from PuTTY source code</remarks>
public void AnswerMessage(Stream messageStream, Process process = null)
{
if (messageStream.CanTimeout) {
messageStream.ReadTimeout = 5000;
}
var messageParser = new BlobParser(messageStream);
var responseBuilder = new BlobBuilder();
BlobHeader header;
try {
header = messageParser.ReadHeader();
if (MessageReceived != null) {
var eventArgs = new MessageReceivedEventArgs(header);
MessageReceived(this, eventArgs);
if (eventArgs.Fail) {
throw new Exception ();
}
}
} catch (Exception) {
header = new BlobHeader();
header.Message = Message.UNKNOWN;
// this will cause the switch statement below to use the default case
// which returns an error to the stream.
}
switch (header.Message) {
case Message.SSH1_AGENTC_REQUEST_RSA_IDENTITIES:
/*
* Reply with SSH1_AGENT_RSA_IDENTITIES_ANSWER.
*/
try {
if (header.BlobLength > 1) {
// ruby net-ssh tries to send a SSH2_AGENT_REQUEST_VERSION message
// which has the same id number as SSH1_AGENTC_REQUEST_RSA_IDENTITIES
// with a string tacked on. We need to read the string from the
// stream, but it is not used for anything.
messageParser.ReadString ();
}
var keyList = ListKeys(SshVersion.SSH1);
if (FilterKeyListCallback != null) {
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList) {
responseBuilder.AddBytes(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_REQUEST_IDENTITIES:
/*
* Reply with SSH2_AGENT_IDENTITIES_ANSWER.
*/
try {
var keyList = ListKeys(SshVersion.SSH2);
if (FilterKeyListCallback != null) {
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList) {
responseBuilder.AddBlob(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH2_AGENT_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_RSA_CHALLENGE:
/*
* Reply with either SSH1_AGENT_RSA_RESPONSE or
* SSH_AGENT_FAILURE, depending on whether we have that key
* or not.
*/
try {
//Reading publicKey information
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(true);
//Searching for Key here
var matchingKey = mKeyList.Where(key => key.Version == SshVersion.SSH1
&& (key.GetPublicKeyParameters().Equals(publicKeyParams))).Single();
//Reading challenge
var encryptedChallenge = messageParser.ReadSsh1BigIntBlob();
var sessionId = messageParser.ReadBytes(16);
//Checking responseType field
if (messageParser.ReadInt() != 1) {
goto default; //responseType !=1 is not longer supported
}
//Answering to the challenge
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(false /* decrypt */, matchingKey.GetPrivateKeyParameters());
var decryptedChallenge = engine.ProcessBlock(encryptedChallenge,
0, encryptedChallenge.Length);
using (MD5 md5 = MD5.Create()) {
var md5Buffer = new byte[48];
decryptedChallenge.CopyTo(md5Buffer, 0);
sessionId.CopyTo(md5Buffer, 32);
responseBuilder.AddBytes(md5.ComputeHash(md5Buffer));
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_RESPONSE);
break;
}
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_SIGN_REQUEST:
/*
* Reply with either SSH2_AGENT_SIGN_RESPONSE or SSH_AGENT_FAILURE,
* depending on whether we have that key or not.
*/
try {
var keyBlob = messageParser.ReadBlob();
var reqData = messageParser.ReadBlob();
var flags = new SignRequestFlags();
try {
// usually, there are no flags, so parser will throw
flags = (SignRequestFlags)messageParser.ReadInt();
} catch { }
var matchingKey =
mKeyList.Where(key => key.Version == SshVersion.SSH2 &&
key.GetPublicKeyBlob().SequenceEqual(keyBlob)).First();
var confirmConstraints = matchingKey.Constraints
.Where(constraint => constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_CONFIRM);
if (confirmConstraints.Count() > 0) {
if (!ConfirmUserPermissionCallback.Invoke(matchingKey, process)) {
goto default;
}
}
/* create signature */
var signKey = matchingKey;
var signer = signKey.GetSigner();
var algName = signKey.Algorithm.GetIdentifierString();
signer.Init(true, signKey.GetPrivateKeyParameters());
signer.BlockUpdate(reqData, 0, reqData.Length);
byte[] signature = signer.GenerateSignature();
signature = signKey.FormatSignature(signature);
BlobBuilder signatureBuilder = new BlobBuilder();
if (!flags.HasFlag(SignRequestFlags.SSH_AGENT_OLD_SIGNATURE)) {
signatureBuilder.AddStringBlob(algName);
}
signatureBuilder.AddBlob(signature);
responseBuilder.AddBlob(signatureBuilder.GetBlob());
responseBuilder.InsertHeader(Message.SSH2_AGENT_SIGN_RESPONSE);
try {
KeyUsed(this, new KeyUsedEventArgs(signKey, process));
} catch { }
break; // succeeded
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failure
case Message.SSH1_AGENTC_ADD_RSA_IDENTITY:
case Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked) {
goto default;
}
bool ssh1constrained = (header.Message == Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED);
try {
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(false);
var keyPair = messageParser.ReadSsh1KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH1, keyPair);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (ssh1constrained) {
while (messageStream.Position < header.BlobLength + 4) {
KeyConstraint constraint = new KeyConstraint();
constraint.Type = (KeyConstraintType)messageParser.ReadByte();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME) {
constraint.Data = messageParser.ReadInt();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_ADD_IDENTITY:
case Message.SSH2_AGENTC_ADD_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked) {
goto default;
}
bool constrained = (header.Message ==
Message.SSH2_AGENTC_ADD_ID_CONSTRAINED);
try {
var publicKeyParams = messageParser.ReadSsh2PublicKeyData();
var keyPair = messageParser.ReadSsh2KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH2, keyPair);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (constrained) {
while (messageStream.Position < header.BlobLength + 4) {
KeyConstraint constraint = new KeyConstraint();
constraint.Type =
(KeyConstraintType)messageParser.ReadByte();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME) {
constraint.Data = messageParser.ReadInt();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; // success!
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY:
case Message.SSH2_AGENTC_REMOVE_IDENTITY:
/*
* Remove from the list and return SSH_AGENT_SUCCESS, or
* perhaps SSH_AGENT_FAILURE if it wasn't in the list to
* start with.
*/
if (IsLocked) {
goto default;
}
SshVersion removeVersion;
byte[] rKeyBlob;
if (header.Message == Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY) {
removeVersion = SshVersion.SSH1;
rKeyBlob = messageParser.ReadBytes(header.BlobLength - 1);
} else if (header.Message == Message.SSH2_AGENTC_REMOVE_IDENTITY) {
removeVersion = SshVersion.SSH2;
rKeyBlob = messageParser.ReadBlob();
} else {
Debug.Fail("Should not get here.");
goto default;
}
try {
var matchingKey = mKeyList.Get(removeVersion, rKeyBlob);
var startKeyListLength = mKeyList.Count;
RemoveKey(matchingKey);
// only succeed if key was removed
if (mKeyList.Count == startKeyListLength - 1) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
}
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
case Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
/*
* Remove all SSH-1 or SSH-2 keys.
*/
if (IsLocked) {
goto default;
}
SshVersion removeAllVersion;
if (header.Message == Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES) {
removeAllVersion = SshVersion.SSH1;
} else if (header.Message == Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES) {
removeAllVersion = SshVersion.SSH2;
} else {
Debug.Fail("Should not get here.");
goto default;
}
try {
RemoveAllKeys(removeAllVersion);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH_AGENTC_LOCK:
try {
var passphrase = new PinnedArray<byte>(messageParser.ReadBlob());
try {
Lock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (IsLocked) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
case Message.SSH_AGENTC_UNLOCK:
try {
var passphrase = new PinnedArray<byte>(messageParser.ReadBlob());
try {
Unlock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (!IsLocked) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (PassphraseException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
default:
responseBuilder.Clear();
responseBuilder.InsertHeader(Message.SSH_AGENT_FAILURE);
break;
}
/* write response to stream */
if (messageStream.CanSeek)
messageStream.Position = 0;
messageStream.Write(responseBuilder.GetBlob(), 0, responseBuilder.Length);
messageStream.Flush();
}
/// <summary>
/// Parses the data from a PuTTY Private Key (.ppk) file.
/// </summary>
/// <param name="data">The data to parse.</param>
/// <exception cref="dlech.SshAgentLib.PpkFormatterException">
/// there was a problem parsing the file data
/// </exception>
/// <exception cref="CallBackNullException">
/// data is encrypted and passphrase callback is null
/// </exception>
public override object Deserialize(Stream aStream)
{
FileData fileData = new FileData();
/* check for required parameters */
if (aStream == null) {
throw new ArgumentNullException("aStream");
}
string line;
string[] pair = new string[2];
int lineCount, i;
StreamReader reader = new StreamReader(aStream, Encoding.GetEncoding(1252));
char[] delimArray = { cDelimeter };
try {
/* read file version */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (!pair[0].StartsWith(puttyUserKeyFileKey)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
puttyUserKeyFileKey + " expected");
}
string ppkFileVersion = pair[0].Remove(0, puttyUserKeyFileKey.Length);
if (!ppkFileVersion.TryParseVersion(ref fileData.ppkFileVersion)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileVersion);
}
if (fileData.ppkFileVersion == Version.V1) {
if (WarnOldFileFormatCallbackMethod != null) {
WarnOldFileFormatCallbackMethod.Invoke();
}
}
/* read public key encryption algorithm type */
string algorithm = pair[1].Trim();
if (!algorithm.TryParsePublicKeyAlgorithm(ref fileData.publicKeyAlgorithm)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.PublicKeyEncryption);
}
/* read private key encryption algorithm type */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateKeyEncryptionKey) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateKeyEncryptionKey + " expected");
}
algorithm = pair[1].Trim();
if (!algorithm.TryParsePrivateKeyAlgorithm(ref fileData.privateKeyAlgorithm)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.PrivateKeyEncryption);
}
/* read comment */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != commentKey) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
commentKey + " expected");
}
fileData.comment = pair[1].Trim();
/* read public key */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != publicKeyLinesKey) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
publicKeyLinesKey + " expected");
}
if (!int.TryParse(pair[1], out lineCount)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
"integer expected");
}
string publicKeyString = string.Empty;
for (i = 0; i < lineCount; i++) {
publicKeyString += reader.ReadLine();
}
fileData.publicKeyBlob = Util.FromBase64(publicKeyString);
/* read private key */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateKeyLinesKey) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateKeyLinesKey + " expected");
}
if (!int.TryParse(pair[1], out lineCount)) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
"integer expected");
}
string privateKeyString = string.Empty;
for (i = 0; i < lineCount; i++) {
privateKeyString += reader.ReadLine();
}
fileData.privateKeyBlob =
new PinnedArray<byte>(Util.FromBase64(privateKeyString));
/* read MAC */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateMACKey) {
fileData.isHMAC = false;
if (pair[0] != privateHashKey || fileData.ppkFileVersion != Version.V1) {
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateMACKey + " expected");
}
} else {
fileData.isHMAC = true;
}
string privateMACString = pair[1].Trim();
fileData.privateMAC = Util.FromHex(privateMACString);
/* get passphrase and decrypt private key if required */
if (fileData.privateKeyAlgorithm != PrivateKeyAlgorithm.None) {
if (GetPassphraseCallbackMethod == null) {
throw new CallbackNullException();
}
fileData.passphrase = GetPassphraseCallbackMethod.Invoke(fileData.comment);
DecryptPrivateKey(ref fileData);
}
VerifyIntegrity(fileData);
AsymmetricCipherKeyPair cipherKeyPair =
CreateCipherKeyPair(fileData.publicKeyAlgorithm,
fileData.publicKeyBlob, fileData.privateKeyBlob.Data);
SshKey key = new SshKey(SshVersion.SSH2, cipherKeyPair, fileData.comment);
return key;
} catch (PpkFormatterException) {
throw;
} catch (CallbackNullException) {
throw;
} catch (Exception ex) {
throw new PpkFormatterException(
PpkFormatterException.PpkErrorType.FileFormat,
"See inner exception.", ex);
} finally {
if (fileData.publicKeyBlob != null) {
Array.Clear(fileData.publicKeyBlob, 0, fileData.publicKeyBlob.Length);
}
if (fileData.privateKeyBlob != null) {
fileData.privateKeyBlob.Dispose();
}
if (fileData.privateMAC != null) {
Array.Clear(fileData.privateMAC, 0, fileData.privateMAC.Length);
}
reader.Close();
}
}
public static SshKey CreateKey(SshVersion version,
PublicKeyAlgorithm algorithm, string comment = "")
{
if (version == SshVersion.SSH1 &&
algorithm != PublicKeyAlgorithm.SSH_RSA) {
throw new Exception("unsupported version/algorithm combination");
}
switch (algorithm) {
case PublicKeyAlgorithm.SSH_RSA:
KeyGenerationParameters keyGenParam =
new KeyGenerationParameters(secureRandom, 512);
RsaKeyPairGenerator rsaKeyPairGen = new RsaKeyPairGenerator();
rsaKeyPairGen.Init(keyGenParam);
AsymmetricCipherKeyPair keyPair = rsaKeyPairGen.GenerateKeyPair();
var rsaKey = new SshKey(version, keyPair);
rsaKey.Comment = comment;
return rsaKey;
case PublicKeyAlgorithm.SSH_DSS:
DsaParametersGenerator dsaParamGen = new DsaParametersGenerator();
dsaParamGen.Init(512, 10, secureRandom);
DsaParameters dsaParam = dsaParamGen.GenerateParameters();
DsaKeyGenerationParameters dsaKeyGenParam =
new DsaKeyGenerationParameters(secureRandom, dsaParam);
DsaKeyPairGenerator dsaKeyPairGen = new DsaKeyPairGenerator();
dsaKeyPairGen.Init(dsaKeyGenParam);
keyPair = dsaKeyPairGen.GenerateKeyPair();
var dsaKey = new SshKey(SshVersion.SSH2, keyPair);
dsaKey.Comment = comment;
return dsaKey;
case PublicKeyAlgorithm.ECDSA_SHA2_NISTP256:
X9ECParameters ecdsa256X9Params =
SecNamedCurves.GetByName("secp256r1");
ECDomainParameters ecdsa256DomainParams =
new ECDomainParameters(ecdsa256X9Params.Curve, ecdsa256X9Params.G,
ecdsa256X9Params.N, ecdsa256X9Params.H);
ECKeyGenerationParameters ecdsa256GenParams =
new ECKeyGenerationParameters(ecdsa256DomainParams, secureRandom);
ECKeyPairGenerator ecdsa256Gen = new ECKeyPairGenerator();
ecdsa256Gen.Init(ecdsa256GenParams);
keyPair = ecdsa256Gen.GenerateKeyPair();
var ecdsa256Key = new SshKey(SshVersion.SSH2, keyPair);
ecdsa256Key.Comment = comment;
return ecdsa256Key;
case PublicKeyAlgorithm.ECDSA_SHA2_NISTP384:
X9ECParameters ecdsa384X9Params =
SecNamedCurves.GetByName("secp384r1");
ECDomainParameters ecdsa384DomainParams =
new ECDomainParameters(ecdsa384X9Params.Curve, ecdsa384X9Params.G,
ecdsa384X9Params.N, ecdsa384X9Params.H);
ECKeyGenerationParameters ecdsa384GenParams =
new ECKeyGenerationParameters(ecdsa384DomainParams, secureRandom);
ECKeyPairGenerator ecdsa384Gen = new ECKeyPairGenerator();
ecdsa384Gen.Init(ecdsa384GenParams);
keyPair = ecdsa384Gen.GenerateKeyPair();
var ecdsa384Key = new SshKey(SshVersion.SSH2, keyPair);
ecdsa384Key.Comment = comment;
return ecdsa384Key;
case PublicKeyAlgorithm.ECDSA_SHA2_NISTP521:
X9ECParameters ecdsa521X9Params =
SecNamedCurves.GetByName("secp521r1");
ECDomainParameters ecdsa521DomainParams =
new ECDomainParameters(ecdsa521X9Params.Curve, ecdsa521X9Params.G,
ecdsa521X9Params.N, ecdsa521X9Params.H);
ECKeyGenerationParameters ecdsa521GenParams =
new ECKeyGenerationParameters(ecdsa521DomainParams, secureRandom);
ECKeyPairGenerator ecdsa521Gen = new ECKeyPairGenerator();
ecdsa521Gen.Init(ecdsa521GenParams);
keyPair = ecdsa521Gen.GenerateKeyPair();
var ecdsa521Key = new SshKey(SshVersion.SSH2, keyPair);
ecdsa521Key.Comment = comment;
return ecdsa521Key;
case PublicKeyAlgorithm.ED25519:
var privateKeySeed = secureRandom.GenerateSeed(Ed25519.PrivateKeySeedSizeInBytes);
var publicKeyBytes = new byte[Ed25519.PublicKeySizeInBytes];
var privateKeyBytes = new byte[Ed25519.ExpandedPrivateKeySizeInBytes];
Ed25519.KeyPairFromSeed(out publicKeyBytes, out privateKeyBytes, privateKeySeed);
var publicKey = new Ed25519PublicKeyParameter(publicKeyBytes);
var privateKey = new Ed25519PrivateKeyParameter(privateKeyBytes);
var ed25519Key = new SshKey(SshVersion.SSH2, publicKey, privateKey, comment);
return ed25519Key;
default:
throw new Exception("unsupported algorithm");
}
}
public SshKey Clone()
{
AsymmetricCipherKeyPair keyPair = new AsymmetricCipherKeyPair(
GetPublicKeyParameters(), GetPrivateKeyParameters());
SshKey newKey = new SshKey(Version, keyPair, Comment);
newKey.Source = Source;
foreach (Agent.KeyConstraint constraint in keyConstraints) {
newKey.AddConstraint(constraint);
}
return newKey;
}
public override object Deserialize(Stream aStream)
{
/* check for required parameters */
if (aStream == null)
{
throw new ArgumentNullException("aStream");
}
/* reading unencrypted part */
BlobParser parser = new BlobParser(aStream);
parser.ReadBytes((uint)FILE_HEADER_LINE.Length + 2); //Skipping header line
byte cipherType = parser.ReadUInt8();
if (cipherType != SSH_CIPHER_3DES && cipherType != SSH_CIPHER_NONE)
{
//TripleDes is the only encryption supported
throw new KeyFormatterException("Unsupported cypherType: " + cipherType);
}
parser.ReadUInt32(); //reserved
/* reading public key */
AsymmetricKeyParameter aPublicKeyParameter =
parser.ReadSsh1PublicKeyData(false);
String keyComment = parser.ReadString();
/* reading private key */
byte[] inputBuffer = new byte[aStream.Length];
aStream.Read(inputBuffer, 0, inputBuffer.Length);
byte[] ouputBuffer;
try {
if (cipherType == 3)
{
/* private key is 3DES encrypted */
PasswordFinder pwFinder = null;
if (GetPassphraseCallbackMethod != null)
{
pwFinder = new PasswordFinder(GetPassphraseCallbackMethod);
}
byte[] keydata;
try {
using (MD5 md5 = MD5.Create()) {
char[] md5Buffer = pwFinder.GetPassword();
keydata = md5.ComputeHash(Encoding.ASCII.GetBytes(md5Buffer));
}
} catch (PasswordException ex) {
if (GetPassphraseCallbackMethod == null)
{
throw new CallbackNullException();
}
throw new KeyFormatterException("see inner exception", ex);
}
/* decryption */
DesSsh1Engine desEngine = new DesSsh1Engine();
desEngine.Init(false, new KeyParameter(keydata));
BufferedBlockCipher bufferedBlockCipher = new BufferedBlockCipher(desEngine);
ouputBuffer = bufferedBlockCipher.ProcessBytes(inputBuffer);
}
else
{
/* private key is stored in plain text */
ouputBuffer = inputBuffer;
}
var privateKeyParser = new BlobParser(ouputBuffer);
/* checking result of decryption */
byte[] resultCheck = privateKeyParser.ReadBytes(4);
if (resultCheck[0] != resultCheck[2] || resultCheck[1] != resultCheck[3])
{
throw new KeyFormatterException("bad passphrase");
}
/* reading private key */
var keyPair = privateKeyParser.ReadSsh1KeyData(aPublicKeyParameter);
SshKey key = new SshKey(SshVersion.SSH1, keyPair);
key.Comment = keyComment;
return(key);
} catch (KeyFormatterException) {
throw;
} catch (Exception ex) {
throw new KeyFormatterException("see inner exception", ex);
}
}
static AgentTest()
{
buffer = new byte[4096];
stream = new MemoryStream(buffer);
parser = new BlobParser(stream);
rsa1Key = KeyGenerator.CreateKey(SshVersion.SSH1,
PublicKeyAlgorithm.SSH_RSA, "SSH1 RSA test key");
rsaKey = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.SSH_RSA, "SSH2 RSA test key");
dsaKey = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.SSH_DSS, "SSH2 DSA test key");
ecdsa256Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP256, "SSH2 ECDSA 256 test key");
ecdsa384Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP384, "SSH2 ECDSA 384 test key");
ecdsa521Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ECDSA_SHA2_NISTP521, "SSH2 ECDSA 521 test key");
ed25519Key = KeyGenerator.CreateKey(SshVersion.SSH2,
PublicKeyAlgorithm.ED25519, "SSH2 ED25519 test key");
List<ISshKey> allKeysList = new List<ISshKey>();
allKeysList.Add(rsa1Key);
allKeysList.Add(rsaKey);
allKeysList.Add(dsaKey);
allKeysList.Add(ecdsa256Key);
allKeysList.Add(ecdsa384Key);
allKeysList.Add(ecdsa521Key);
allKeysList.Add(ed25519Key);
allKeys = allKeysList.AsReadOnly();
}
public void TestOnKeyListChanged()
{
Agent agent = new TestAgent();
/* test that key with lifetime constraint is automatically removed *
* after lifetime expires */
AsymmetricCipherKeyPair keyPair =
new AsymmetricCipherKeyPair(rsaKey.GetPublicKeyParameters(),
rsaKey.GetPrivateKeyParameters());
ISshKey key = new SshKey(SshVersion.SSH2, keyPair);
Agent.KeyConstraint constraint = new Agent.KeyConstraint();
constraint.Type = Agent.KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME;
constraint.Data = (UInt32)1;
key.AddConstraint(constraint);
agent.AddKey(key);
Thread.Sleep(500);
Assert.That(agent.GetAllKeys().Count, Is.EqualTo(1));
Thread.Sleep(1000);
Assert.That(agent.GetAllKeys().Count, Is.EqualTo(0));
}
/// <summary>
/// Parses the data from a PuTTY Private Key (.ppk) file.
/// </summary>
/// <param name="data">The data to parse.</param>
/// <exception cref="dlech.SshAgentLib.PpkFormatterException">
/// there was a problem parsing the file data
/// </exception>
/// <exception cref="CallBackNullException">
/// data is encrypted and passphrase callback is null
/// </exception>
public override object Deserialize(Stream aStream)
{
FileData fileData = new FileData();
/* check for required parameters */
if (aStream == null)
{
throw new ArgumentNullException("aStream");
}
string line;
string[] pair = new string[2];
int lineCount, i;
StreamReader reader = new StreamReader(aStream, Encoding.GetEncoding(1252));
char[] delimArray = { cDelimeter };
try {
/* read file version */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (!pair[0].StartsWith(puttyUserKeyFileKey))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
puttyUserKeyFileKey + " expected");
}
string ppkFileVersion = pair[0].Remove(0, puttyUserKeyFileKey.Length);
if (!ppkFileVersion.TryParseVersion(ref fileData.ppkFileVersion))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileVersion);
}
if (fileData.ppkFileVersion == Version.V1)
{
if (WarnOldFileFormatCallbackMethod != null)
{
WarnOldFileFormatCallbackMethod.Invoke();
}
}
/* read public key encryption algorithm type */
string algorithm = pair[1].Trim();
if (!algorithm.TryParsePublicKeyAlgorithm(ref fileData.publicKeyAlgorithm))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.PublicKeyEncryption);
}
/* read private key encryption algorithm type */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateKeyEncryptionKey)
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateKeyEncryptionKey + " expected");
}
algorithm = pair[1].Trim();
if (!algorithm.TryParsePrivateKeyAlgorithm(ref fileData.privateKeyAlgorithm))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.PrivateKeyEncryption);
}
/* read comment */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != commentKey)
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
commentKey + " expected");
}
fileData.comment = pair[1].Trim();
/* read public key */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != publicKeyLinesKey)
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
publicKeyLinesKey + " expected");
}
if (!int.TryParse(pair[1], out lineCount))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
"integer expected");
}
string publicKeyString = string.Empty;
for (i = 0; i < lineCount; i++)
{
publicKeyString += reader.ReadLine();
}
fileData.publicKeyBlob = Util.FromBase64(publicKeyString);
/* read private key */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateKeyLinesKey)
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateKeyLinesKey + " expected");
}
if (!int.TryParse(pair[1], out lineCount))
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
"integer expected");
}
string privateKeyString = string.Empty;
for (i = 0; i < lineCount; i++)
{
privateKeyString += reader.ReadLine();
}
fileData.privateKeyBlob =
new PinnedArray <byte>(Util.FromBase64(privateKeyString));
/* read MAC */
line = reader.ReadLine();
pair = line.Split(delimArray, 2);
if (pair[0] != privateMACKey)
{
fileData.isHMAC = false;
if (pair[0] != privateHashKey || fileData.ppkFileVersion != Version.V1)
{
throw new PpkFormatterException(PpkFormatterException.PpkErrorType.FileFormat,
privateMACKey + " expected");
}
}
else
{
fileData.isHMAC = true;
}
string privateMACString = pair[1].Trim();
fileData.privateMAC = Util.FromHex(privateMACString);
/* get passphrase and decrypt private key if required */
if (fileData.privateKeyAlgorithm != PrivateKeyAlgorithm.None)
{
if (GetPassphraseCallbackMethod == null)
{
throw new CallbackNullException();
}
fileData.passphrase = GetPassphraseCallbackMethod.Invoke(fileData.comment);
DecryptPrivateKey(ref fileData);
}
VerifyIntegrity(fileData);
AsymmetricCipherKeyPair cipherKeyPair =
CreateCipherKeyPair(fileData.publicKeyAlgorithm,
fileData.publicKeyBlob, fileData.privateKeyBlob.Data);
SshKey key = new SshKey(SshVersion.SSH2, cipherKeyPair, fileData.comment);
return(key);
} catch (PpkFormatterException) {
throw;
} catch (CallbackNullException) {
throw;
} catch (Exception ex) {
throw new PpkFormatterException(
PpkFormatterException.PpkErrorType.FileFormat,
"See inner exception.", ex);
} finally {
if (fileData.publicKeyBlob != null)
{
Array.Clear(fileData.publicKeyBlob, 0, fileData.publicKeyBlob.Length);
}
if (fileData.privateKeyBlob != null)
{
fileData.privateKeyBlob.Dispose();
}
if (fileData.privateMAC != null)
{
Array.Clear(fileData.privateMAC, 0, fileData.privateMAC.Length);
}
reader.Close();
}
}
