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package com.yahoo.vespa.athenz.gcp;
import com.google.api.client.http.apache.v2.ApacheHttpTransport;
import com.google.auth.http.HttpTransportFactory;
import com.google.auth.oauth2.ExternalAccountCredentials;
import com.yahoo.security.token.TokenDomain;
import com.yahoo.security.token.TokenGenerator;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.vespa.athenz.api.AthenzDomain;
import com.yahoo.vespa.athenz.identity.ServiceIdentityProvider;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
public class GcpCredentials {
private static final TokenDomain domain = TokenDomain.of("athenz-gcp-oauth2-nonce");
final private InputStream tokenApiStream;
private final HttpTransportFactory httpTransportFactory;
private GcpCredentials(Builder builder) {
String clientId = builder.athenzDomain.getName() + ".gcp";
String audience = String.format("//iam.googleapis.com/projects/%s/locations/global/workloadIdentityPools/%s/providers/%s",
builder.projectNumber, builder.workloadPoolName, builder.workloadProviderName);
String serviceUrl = String.format("https://iamcredentials.googleapis.com/v1/projects/-/serviceAccounts/%s@%s.iam.gserviceaccount.com:generateAccessToken",
builder.serviceAccountName, builder.projectName);
String scope = URLEncoder.encode(generateIdTokenScope(builder.athenzDomain.getName(), builder.role), StandardCharsets.UTF_8);
String redirectUri = URLEncoder.encode(generateRedirectUri(clientId, builder.redirectURISuffix), StandardCharsets.UTF_8);
String tokenUrl = String.format("%s/oauth2/auth?response_type=id_token&client_id=%s&redirect_uri=%s&scope=%s&nonce=%s&keyType=EC&fullArn=true&output=json",
builder.ztsUrl, clientId, redirectUri, scope, TokenGenerator.generateToken(domain, "", 32).secretTokenString());
tokenApiStream = createTokenAPIStream(audience, serviceUrl, tokenUrl, builder.tokenLifetimeSeconds);
SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(builder.identityProvider.getIdentitySslContext());
HttpClientBuilder httpClientBuilder = ApacheHttpTransport.newDefaultHttpClientBuilder()
.setSSLSocketFactory(sslConnectionSocketFactory);
httpTransportFactory = () -> new ApacheHttpTransport(httpClientBuilder.build());
}
public ExternalAccountCredentials getCredential() throws IOException {
return ExternalAccountCredentials.fromStream(tokenApiStream, httpTransportFactory);
}
private InputStream createTokenAPIStream(final String audience, final String serviceUrl, final String tokenUrl,
int tokenLifetimeSeconds) {
Slime root = new Slime();
Cursor c = root.setObject();
c.setString("type", "external_account");
c.setString("audience", audience);
c.setString("subject_token_type", "urn:ietf:params:oauth:token-type:jwt");
c.setString("token_url", "https://sts.googleapis.com/v1/token");
c.setString("service_account_impersonation_url", serviceUrl);
Cursor sai = c.setObject("service_account_impersonation");
sai.setLong("token_lifetime_seconds", tokenLifetimeSeconds);
Cursor credentialSource = c.setObject("credential_source");
credentialSource.setString("url", tokenUrl);
Cursor credentialSourceFormat = credentialSource.setObject("format");
credentialSourceFormat.setString("type", "json");
credentialSourceFormat.setString("subject_token_field_name", "id_token");
try {
return new ByteArrayInputStream(SlimeUtils.toJsonBytes(root));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private static String generateIdTokenScope(final String domainName, String roleName) {
StringBuilder scope = new StringBuilder(256);
scope.append("openid");
scope.append(' ').append(domainName).append(":role.").append(roleName);
return scope.toString();
}
private static String generateRedirectUri(final String clientId, String uriSuffix) {
int idx = clientId.lastIndexOf('.');
if (idx == -1) {
return "";
}
final String dashDomain = clientId.substring(0, idx).replace('.', '-');
final String service = clientId.substring(idx + 1);
return "https://" + service + "." + dashDomain + "." + uriSuffix;
}
public static class Builder {
private String ztsUrl;
private ServiceIdentityProvider identityProvider;
private String redirectURISuffix;
private AthenzDomain athenzDomain;
private String role;
private String projectName;
private String projectNumber;
private String serviceAccountName;
private int tokenLifetimeSeconds = 3600; // default to 1 hour lifetime
private String workloadPoolName = "athenz";
private String workloadProviderName = "athenz";
public GcpCredentials build() {
Objects.requireNonNull(ztsUrl);
Objects.requireNonNull(identityProvider);
Objects.requireNonNull(redirectURISuffix);
Objects.requireNonNull(athenzDomain);
Objects.requireNonNull(role);
Objects.requireNonNull(projectName);
Objects.requireNonNull(projectNumber);
Objects.requireNonNull(serviceAccountName);
return new GcpCredentials(this);
}
public Builder setZtsUrl(String ztsUrl) {
this.ztsUrl = ztsUrl;
return this;
}
public Builder identityProvider(ServiceIdentityProvider provider) {
this.identityProvider = provider;
return this;
}
public Builder redirectURISuffix(String redirectURISuffix) {
this.redirectURISuffix = redirectURISuffix;
return this;
}
public Builder athenzDomain(AthenzDomain athenzDomain) {
this.athenzDomain = athenzDomain;
return this;
}
public Builder role(String gcpRole) {
this.role = gcpRole;
return this;
}
public Builder projectName(String projectName) {
this.projectName = projectName;
return this;
}
public Builder projectNumber(String projectNumber) {
this.projectNumber = projectNumber;
return this;
}
public Builder serviceAccountName(String serviceAccountName) {
this.serviceAccountName = serviceAccountName;
return this;
}
public Builder tokenLifetimeSeconds(int tokenLifetimeSeconds) {
this.tokenLifetimeSeconds = tokenLifetimeSeconds;
return this;
}
public Builder workloadPoolName(String workloadPoolName) {
this.workloadPoolName = workloadPoolName;
return this;
}
public Builder workloadProviderName(String workloadProviderName) {
this.workloadProviderName = workloadProviderName;
return this;
}
}
}
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