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package fish.payara.microprofile.config.extensions.azure;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JOSEObjectType;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.JWSHeader;
import com.nimbusds.jose.crypto.RSASSASigner;
import com.nimbusds.jose.util.Base64;
import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.jwt.JWTClaimsSet;
import com.nimbusds.jwt.SignedJWT;
import fish.payara.microprofile.config.extensions.oauth.OAuth2Client;
import fish.payara.microprofile.config.extensions.azure.model.Secret;
import fish.payara.microprofile.config.extensions.azure.model.SecretHolder;
import fish.payara.microprofile.config.extensions.azure.model.SecretsResponse;
import fish.payara.nucleus.microprofile.config.source.extension.ConfiguredExtensionConfigSource;
import fish.payara.nucleus.microprofile.config.spi.MicroprofileConfigConfiguration;
import java.io.File;
import java.nio.file.Files;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Stream;
import jakarta.inject.Inject;
import jakarta.json.JsonObject;
import jakarta.ws.rs.client.Client;
import jakarta.ws.rs.client.ClientBuilder;
import jakarta.ws.rs.client.Entity;
import jakarta.ws.rs.client.WebTarget;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;
import jakarta.xml.bind.DatatypeConverter;
import org.glassfish.api.admin.ServerEnvironment;
import org.jvnet.hk2.annotations.Service;
@Service(name = "azure-secrets-config-source")
public class AzureSecretsConfigSource extends ConfiguredExtensionConfigSource {
private static final Logger LOGGER = Logger.getLogger(AzureSecretsConfigSource.class.getName());
private OAuth2Client authClient;
private Client client = ClientBuilder.newClient();
private static final String AUTH_URL = "https://login.microsoftonline.com/%s/oauth2/v2.0/token";
private static final String SCOPE_URL = "https://vault.azure.net/.default";
private static final String SECRETS_ENDPOINT = "https://%s.vault.azure.net/secrets";
private static final String API_VERSION = "?api-version=7.1";
@Inject
private ServerEnvironment env;
@Inject
MicroprofileConfigConfiguration mpconfig;
@Override
public void bootstrap() {
StringBuilder contentBuilder = new StringBuilder();
try {
final File tokenFile = getPrivateKeyFile();
if (tokenFile == null) {
LOGGER.warning("Couldn't find private key file, make sure it's configured.");
} else {
try (Stream stream = Files.lines(tokenFile.toPath())) {
stream.forEach(s -> contentBuilder.append(s));
}
}
} catch (Exception ex) {
LOGGER.log(Level.WARNING, "Couldn't find or read the private key file, make sure it exists.", ex);
}
Map data = new HashMap<>();
String tenantId = configuration.getTenantId();
String clientId = configuration.getClientId();
if (tenantId == null || clientId == null) {
LOGGER.warning("An error occurred while authenticating Azure to get a token, makes sure Azure Config Source has been configured with correct configuration options.");
} else {
data.put("grant_type", "client_credentials");
data.put("client_id", clientId);
data.put("client_assertion_type", "urn:ietf:params:oauth:client-assertion-type:jwt-bearer");
data.put("scope", SCOPE_URL);
try {
final SignedJWT jwt = buildJwt(clientId, String.format(AUTH_URL, tenantId), configuration.getThumbprint());
jwt.sign(new RSASSASigner(parsePrivateKey(contentBuilder.toString())));
data.put("client_assertion", jwt.serialize());
} catch (NoSuchAlgorithmException | InvalidKeySpecException | JOSEException e) {
LOGGER.log(Level.WARNING, "An error occurred while signing the Azure auth token", e);
}
this.authClient = new OAuth2Client(String.format(AUTH_URL, tenantId), data);
}
}
@Override
public Map getProperties() {
Map results = new HashMap<>();
final String accessToken = authenticate();
if (accessToken == null) {
return results;
}
final WebTarget secretsTarget = client
.target(String.format(SECRETS_ENDPOINT, configuration.getKeyVaultName()) + API_VERSION);
final Response secretsResponse = secretsTarget
.request()
.accept(MediaType.APPLICATION_JSON)
.header("Authorization", "Bearer " + accessToken)
.get();
if (secretsResponse.getStatus() != 200) {
return results;
}
final List secrets = secretsResponse
.readEntity(SecretsResponse.class)
.getValue();
for (Secret secret : secrets) {
final String secretName = secret.getId().replace(String.format(SECRETS_ENDPOINT, configuration.getKeyVaultName()) + "/", "");
results.put(secretName, getValue(secretName));
}
return results;
}
@Override
public Set getPropertyNames() {
return getProperties().keySet();
}
@Override
public String getValue(String propertyName) {
final String accessToken = authenticate();
if (accessToken == null) {
return null;
}
final WebTarget secretTarget = client
.target(String.format(SECRETS_ENDPOINT, configuration.getKeyVaultName()) + "/" + propertyName + API_VERSION);
final Response secretResponse = secretTarget
.request()
.accept(MediaType.APPLICATION_JSON)
.header("Authorization", "Bearer " + accessToken)
.get();
final int status = secretResponse.getStatus();
if (status != 200) {
if (status != 400) {
LOGGER.log(Level.WARNING, "Failed to get Azure secret. {0}", secretResponse.readEntity(String.class));
}
return null;
}
final String value = secretResponse
.readEntity(Secret.class)
.getValue();
return value;
}
@Override
public boolean setValue(String secretName, String secretValue) {
final String accessToken = authenticate();
if (accessToken == null) {
return false;
}
final WebTarget setSecretTarget = client
.target(String.format(SECRETS_ENDPOINT, configuration.getKeyVaultName()) + "/" + secretName + API_VERSION);
final Response setSecretResponse = setSecretTarget
.request()
.accept(MediaType.APPLICATION_JSON)
.header("Content-Type", MediaType.APPLICATION_JSON)
.header("Authorization", "Bearer " + accessToken)
.put(Entity.entity(new SecretHolder(secretValue), MediaType.APPLICATION_JSON));
if (setSecretResponse.getStatus() == 200) {
return true;
}
LOGGER.log(Level.WARNING, "Failed to set Azure secret. {0}", setSecretResponse.readEntity(String.class));
return false;
}
@Override
public boolean deleteValue(String secretName) {
final String accessToken = authenticate();
if (accessToken == null) {
return false;
}
final WebTarget secretTarget = client
.target(String.format(SECRETS_ENDPOINT, configuration.getKeyVaultName()) + "/" + secretName + API_VERSION);
final Response secretResponse = secretTarget
.request()
.accept(MediaType.APPLICATION_JSON)
.header("Authorization", "Bearer " + accessToken)
.delete();
if (secretResponse.getStatus() == 200) {
return true;
}
LOGGER.log(Level.WARNING, "Failed to delete Azure secret. {0}", secretResponse.readEntity(String.class));
return false;
}
@Override
public String getSource() {
return "cloud";
}
@Override
public String getName() {
return "azure";
}
@Override
public int getOrdinal() {
return Integer.parseInt(mpconfig.getCloudOrdinality());
}
private File getPrivateKeyFile() {
final String fileName = configuration.getPrivateKeyFilePath();
if (fileName != null) {
return env.getConfigDirPath().toPath().resolve(configuration.getPrivateKeyFilePath()).toFile();
}
return null;
}
private static SignedJWT buildJwt(final String issuer, final String audience, final String thumbprint) {
Instant now = Instant.now();
Instant expiry = now.plus(1, ChronoUnit.MINUTES);
JWTClaimsSet claims = new JWTClaimsSet.Builder()
.subject(issuer)
.audience(audience)
.expirationTime(Date.from(expiry))
.issueTime(Date.from(now))
.issuer(issuer)
.build();
byte[] bytes = DatatypeConverter.parseHexBinary(thumbprint);
JWSHeader header = new JWSHeader.Builder(JWSAlgorithm.RS256)
.type(JOSEObjectType.JWT)
.x509CertThumbprint(Base64URL.encode(bytes))
.build();
return new SignedJWT(header, claims);
}
private static PrivateKey parsePrivateKey(String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException {
String privateKeyContent = privateKey
.replaceAll("\\n", "")
.replace("-----BEGIN PRIVATE KEY-----", "")
.replace("-----END PRIVATE KEY-----", "");
KeyFactory kf = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec keySpecPKCS8 = new PKCS8EncodedKeySpec(new Base64(privateKeyContent).decode());
return kf.generatePrivate(keySpecPKCS8);
}
private String authenticate() {
if (authClient == null) {
LOGGER.log(Level.WARNING, "Couldn't authenticate with Azure. Check your configuration options are correct.");
} else {
final Response response = authClient.authenticate();
final int status = response.getStatus();
if (status == 200) {
JsonObject data = response.readEntity(JsonObject.class);
Integer expirySeconds = data.getInt("expires_in");
authClient.expire(Duration.ofSeconds(expirySeconds));
return data.getString("access_token");
} else if (status == 400) {
LOGGER.log(Level.WARNING, "Couldn't authenticate with Azure. Check your configuration options are correct.");
}
}
return null;
}
}
