/**
* @param username
* @param algorithm
* @param encoded
* @param service
* @param sessionId
* @param signature
* @return
* @throws IOException
*/
public boolean verifyKeySignature(
String username,
String algorithm,
byte[] encoded,
String service,
byte[] sessionId,
byte[] signature)
throws IOException {
try {
SshPublicKey key = getAuthorizedKey(username, algorithm, encoded);
ByteArrayWriter data = new ByteArrayWriter();
data.writeBinaryString(sessionId);
data.write(SshMsgUserAuthRequest.SSH_MSG_USERAUTH_REQUEST);
data.writeString(username);
data.writeString(service);
data.writeString("publickey");
data.write(1);
data.writeString(key.getAlgorithmName());
data.writeBinaryString(key.getEncoded());
if (key.verifySignature(signature, data.toByteArray())) {
return true;
}
} catch (IOException ex) {
}
return false;
}
private SshPublicKey getAuthorizedKey(String username, String algorithm, byte[] encoded)
throws IOException {
NativeAuthenticationProvider provider = NativeAuthenticationProvider.getInstance();
String userHome = provider.getHomeDirectory(username); // , nativeSettings);
if (userHome == null) {
log.warn("There is no home directory for " + username + " is available");
}
// Replace '\' with '/' because when we use it in String.replaceAll
// for some reason it removes them?
if (userHome != null) {
userHome = userHome.replace('\\', '/');
}
ServerConfiguration config =
(ServerConfiguration) ConfigurationLoader.getConfiguration(ServerConfiguration.class);
String authorizationFile;
String userConfigDir = config.getUserConfigDirectory();
// First replace any '\' with '/' (Becasue replaceAll removes them!)
userConfigDir = userConfigDir.replace('\\', '/');
// Replace any home directory tokens
if ((userConfigDir.indexOf("%D") > -1) && (userHome == null)) {
throw new IOException(
"<UserConfigDirectory> requires home directory, but none available for " + username);
}
int idx = 0;
while ((idx = userConfigDir.indexOf("%D", idx + 1)) > -1) {
StringBuffer buf = new StringBuffer(userConfigDir);
buf = buf.replace(idx, idx + 1, userHome);
userConfigDir = buf.toString();
}
idx = 0;
while ((idx = userConfigDir.indexOf("%U", idx + 1)) > -1) {
StringBuffer buf = new StringBuffer(userConfigDir);
buf = buf.replace(idx, idx + 1, username);
userConfigDir = buf.toString();
}
// Replace the '/' with File.seperator and trim
userConfigDir = userConfigDir.replace('/', File.separatorChar).trim();
if (!userConfigDir.endsWith(File.separator)) {
userConfigDir += File.separator;
}
authorizationFile = userConfigDir + config.getAuthorizationFile();
// Load the authorization file
File file = new File(authorizationFile);
if (!file.exists()) {
log.info("authorizationFile: " + authorizationFile + " does not exist.");
throw new IOException("authorizationFile: " + authorizationFile + " does not exist.");
}
FileInputStream in = new FileInputStream(file);
Authorization keys;
try {
keys = new Authorization(in);
} catch (Exception e) {
throw new AuthenticationProtocolException(
"Failed to load authorized keys file " + authorizationFile);
}
// SshPublicKey key = SshPublicKeyFile.parse(encoded);
Iterator it = keys.getAuthorizedKeys().iterator();
SshKeyPair pair = SshKeyPairFactory.newInstance(algorithm);
SshPublicKey authorizedKey = null;
SshPublicKey key = pair.decodePublicKey(encoded);
boolean valid = false;
String keyfile;
while (it.hasNext()) {
keyfile = (String) it.next();
// Look for the file in the user config dir first
file = new File(userConfigDir + keyfile);
// If it does not exist then look absolute
if (!file.exists()) {
file = new File(keyfile);
}
if (file.exists()) {
// Try to open the public key in the default file format
// otherwise attempt the supported key formats
SshPublicKeyFile pkf = SshPublicKeyFile.parse(file);
authorizedKey = pkf.toPublicKey();
if (authorizedKey.equals(key)) {
return authorizedKey;
}
} else {
log.info("Failed attempt to load key file " + keyfile);
}
}
throw new IOException("");
}