Authentication with OpenID Connect

OpenID Connect for Servers is the preferred way to authenticate with the Pismo platform. It provides greater security guarantees in service communications than basic authentication using client credentials. In addition, OpenID Connect supports multi-tenancy. This means that, for example, you can give a third party access to only a specific set of endpoints within your organization.

Server authentication

During onboarding to production, you must generate at least one pair of public and private keys for OpenID authentication. Then, you must generate and sign a JSON Web Token (JWT) for each key pair that you generate. For more information about JWTs, see Generate your JWT.

  1. Use the OpenSSL toolkit to generate a private key and a public key, using the following commands:
Generate a private key:
  $ openssl genpkey -out rsakey.pem -algorithm RSA -pkeyopt rsa_keygen_bits:2048
Generate a public key based on the private key yougenerated:
  $ openssl rsa -in rsakey.pem -out rsa.pub -pubout -outform PEM
  1. Store your private key securely, and send the public key to your Pismo representative, along with your Org ID (also known as Tentant ID).
  2. Generate your JWT using the private key associated with the pubic key you shared using the claims values here.
  3. Request an access token using the endpoint Get OpenID access token

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The response to this call includes an access token that you can use with an API endpoint. If the response does not include an access token, your JWT might not be properly formed.

  1. Retrieve the access token returned in the Pismo response.
  2. Use this access token to make API calls.

The following diagram illustrates steps 3 to 6:

Image shows how the Pismo platform connects to the client server.

Generate your JWT

You generate and sign a JWT using the private key you generated (in step 1 above). This JWT should contain the following claims:

keyTypeMandatoryValuedescription
algFixed string valueYesRS256
issFixed string valueYesValue provided by Pismo.
subFixed string valueYesValue provided by Pismo.
audFixed string valueYesValue provided by Pismo
iatTimestamp numberYesex: 1697044489The current time in seconds since the UNIX epoch.
expTimestamp numberYesex:1697048089The time in seconds since the UNIX epoch at which the token expires. It can be a maximum of 3600 seconds later than the iat.
tenant_idFixed string valueYesex: tn_exampleValue provided by Pismo.
The identifier of the tenant of the user
uidString valueYesex: 123456
or
ex: tn_example
The Account ID of the Pismo customer. If you don't want the token to contain an account id, you can use the same value you used for
tenant_id.
pismoObject typeYesex:
"pismo": {
"group": "pismo-v1:sample-group:rw"
},
The identifier of the group that you want your token to have access to. A group has access to a certain subset of endpoints, you can ask your Pismo customer representative for more information on the groups that can be used.
customClaims Object typeNo"customClaims": {
"custom1": "someValue",
"userexample": "myusername"
},
Optional custom claims.

To generate JWTs, we recommend using one of the libraries provided at jwt.io. Another option is to use Google/Firebase helper libraries, where you use the private key in Google's Service Account format and provide it to the libraries. For more information about this implementation, refer to the Google Cloud Platform (GCP) documentation.

The following code sample shows how to create a signed JWT in a few languages:

package main

import (
    "fmt"
    "time"

    "github.com/dgrijalva/jwt-go"
)

var mySigningKey = []byte(`
-----BEGIN PRIVATE KEY-----
...
-----END PRIVATE KEY-----
`)

func main() {

    key, err := jwt.ParseRSAPrivateKeyFromPEM(mySigningKey)
    fmt.Println(err)

    token := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.MapClaims{
        "iss":       "[email protected]",
        "aud":       "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit",
        "exp":       time.Now().Add(time.Hour).Unix(),
        "iat":       time.Now().Unix(),
        "sub":       "[email protected]",
        "uid":       "12345678910",
        "tenant_id": "test-pbrj4",
    })

    // Sign and get the complete encoded token as a string using the secret
    tokenString, err := token.SignedString(key)
    fmt.Println(tokenString, err)

}
package com.star.sud;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.time.Instant;
import java.util.*;

import io.jsonwebtoken.*;


public class JwtTokenwithRsa {

	//Reference to your private key
	public static final String PRIVATE_KEY_FILE_PATH = "RSA/rsakey.pem";

	public static void main(String[] args) {
		try {
			JwtTokenwithRsa tokenwithRsa = new JwtTokenwithRsa();
			tokenwithRsa.generateJWTWithRsa();

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public String generateJwtToken(PrivateKey privateKey) {
		JwtBuilder builder = Jwts.builder().signWith(SignatureAlgorithm.RS256, privateKey);

		long issuedAt = Instant.now().getEpochSecond();
		long expiresAt = Instant.now().plusSeconds(3600).getEpochSecond();
		Map<String,String> pismoClaims = new HashMap<String,String>();
		pismoClaims.put("group","pismo-v1:samplegroup:rw");

		builder.claim("aud", "value provided by Pismo");
		builder.claim("sub", "value provided by Pismo");
		builder.claim("iss", "value provided by Pismo");
		builder.claim("exp", expiresAt);
		builder.claim("iat",issuedAt);
		builder.claim("pismo", pismoClaims);
		builder.claim("tenant_id", "Your Tenant ID");
		builder.claim("uid", "Account Id or Tenant Id");


		String token = builder.compact();
		return token;
	}

	public void generateJWTWithRsa() throws Exception {
		KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance("RSA");
		keyGenerator.initialize(1024);

		File f = new File(PRIVATE_KEY_FILE_PATH);
		PrivateKey privateKey = readPrivateKey(f);


		// Generate Token
		String id = UUID.randomUUID().toString();
		String token = generateJwtToken(privateKey);
		System.out.println("TOKEN:");
		System.out.println(token);

	}

	public RSAPrivateKey readPrivateKey(File file) throws Exception {
		String key = new String(Files.readAllBytes(file.toPath()), Charset.defaultCharset());

		String privateKeyPEM = key
				.replace("-----BEGIN PRIVATE KEY-----", "")
				.replaceAll(System.lineSeparator(), "")
				.replace("-----END PRIVATE KEY-----", "");

		byte[] encoded = Base64.getDecoder().decode(privateKeyPEM);

		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded);
		return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
	}

}
To be released
To be released

Using the JWT to request an access token

After generating the signed JWT, you can use it to request an access token. This access token request is an HTTPS POST request.

Method: POST

Content-Type: application/json

Endpoint: {environment}/passport/v1/oauth2/token

Request body payload:

Property NameTypeDescription
tokenstringA custom token you use to request an access token.

The following sample code shows a cURL POST request for an access token in the Pismo Sandbox:

curl --request POST \
--url https://sandbox.pismolabs.io/passport/v1/oauth2/token \
--header 'Content-Type: application/json' \
--data '{
"token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJmaXJlYmFzZS1hZG1pbnNkay12ZnA3dkBkZXYtZ2tlLTdhNjUuaWFtLmdzZXJ2aWNlYWNjb3VudC5jb20iLCJhdWQiOiJodHRwczovL2lkZW50aXR5dG9vbGtpdC5nb29nbGVhcGlzLmNvbS9nb29nbGUuaWRlbnRpdHkuaWRlbnRpdHl0b29sa2l0LnYxLklkZW50aXR5VG9vbGtpdCIsImV4cCI6MTU3NTY3MzEzMiwiaWF0IjoxNTc1NjY5NTMyLCJzdWIiOiJmaXJlYmFzZS1hZG1pbnNkay12ZnA3dkBkZXYtZ2tlLTdhNjUuaWFtLmdzZXJ2aWNlYWNjb3VudC5jb20iLCJ1aWQiOiJjYXBpdGFvYW1lcmljYUBwaXNtby5pbyIsImNsYWltcyI6eyJ0ZXN0MSI6InRlc3QxIiwidGVzdDIiOiJ0ZXN0MiIsInRlc3QzIjoidGVzdDMifX0.uPCDrPAS0iGGHphG5NSIzHuGlO1Dh9U3FcJ-mpk_cOh04CHnw3Bm56tEFUxJCBpk3CeWHRDK_Q0ybCdotYGPxF7y-HFnFf04t95FgGZgtg1JY2m6UfaDZ3VTD9nWk5wgKJWfKGvwlvBI4ZVTJQKlzj_0QUHxHlzNJGo9sjgSc_roOm_pRZIVkiKm_9e1V5Rgk3tyN0Ov5ACGROyO0NVvWDYrv0w9MyxwZU97kG4O9VdZyc6pqouaYYCQVWWFtwIucOlBc010-ccRovE5ITzNGxiW90fTxbdPdcP_0LOsNH_nPFd8AMk_eYwk5afb_wSE8XFCf19UrjstpWON7su9RA"
}'

Handling the response

If the JWT is properly formed and your service has permission to perform the operation, then the JSON response from the authorization server should include an access token. The following is an example response.

{
  "access_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6InNrSUJOZyJ9.eyJpc3MiOiJodHRwczovL2lkZW50aXR5dG9vbGtpdC5nb29nbGUuY29tLyIsImF1ZCI6ImRldi1na2UtN2E2NSIsImlhdCI6MTU3NjE4MDg4MSwiZXhwIjoxNTc3MzkwNDgxLCJ1c2VyX2lkIjoiY2FwaXRhb2FtZXJpY2FAcGlzbW8uaW8iLCJzaWduX2luX3Byb3ZpZGVyIjoiY3VzdG9tIiwiZXh0cmFfY2xhaW1zIjp7InRlc3QxIjoidGVzdDEiLCJ0ZXN0MiI6InRlc3QyIiwidGVzdDMiOiJ0ZXN0MyJ9fQ.LAv--CRbsZqDhlRXcpnZlyK403oU2i1__fFR7CZ-bgp5e4lF187r1W-9jpZCVLit-QhneHJiaySxlDTAiwYfUu6bpVPw0BaXT-GimmGi-MDudUX3R44VtdQPvOXUHgx43DDD1NsDOwDn5QtrA-pvrfyT-Ijs6GcH4R66XPYaIm_ASHSEPCupK0ZW6VFjiWx3goGtCKG-TQlaGyq-iQ_ZBRJksJf6xIN8bFC1HqODePm3yDbtum2hbxwuZGtBQ0DcgkH4in4TWKwe8qrk37cl5TOkRx1yyhh9Jkhigmu6NuTvCk6ic-aappIR2P9iBB-g3W33-HVutXqqWfd0DXQb5w",
  "refresh_token": "AE0u-NcsvZAKSuwq8Q4E7ZEE9NBmmio7-0JQASKqw8L2AWaFH9EIggs4wuzvE0nnVoC9",
  "expires_in": "3600"
}

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Access tokens expire after one hour

Your application should catch the error generated when this happens. It can then generate another JWT, sign it, and request another access token.

Calling Pismo APIs

After your application obtains an access token, you can use it to make calls to a Pismo API on behalf of the given user account. To do this, include the access token in the authorization: Bearer header of each request, as example below.

curl --request POST \
  --url https://sandbox.pismolabs.io/service/v1/service/example/payment \
  --header 'Content-Type: application/json' \
  --header 'accept: application/json' \
  --header 'authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6InNrSUJOZyJ9.eyJpc3MiOiJodHRwczovL2lkZW50aXR5dG9vbGtpdC5nb29nbGUuY29tLyIsImF1ZCI6ImRldi1na2UtN2E2NSIsImlhdCI6MTU3NjE4MDg4MSwiZXhwIjoxNTc3MzkwNDgxLCJ1c2VyX2lkIjoiY2FwaXRhb2FtZXJpY2FAcGlzbW8uaW8iLCJzaWduX2luX3Byb3ZpZGVyIjoiY3VzdG9tIiwiZXh0cmFfY2xhaW1zIjp7InRlc3QxIjoidGVzdDEiLCJ0ZXN0MiI6InRlc3QyIiwidGVzdDMiOiJ0ZXN0MyJ9fQ.LAv--CRbsZqDhlRXcpnZlyK403oU2i1__fFR7CZ-bgp5e4lF187r1W-9jpZCVLit-QhneHJiaySxlDTAiwYfUu6bpVPw0BaXT-GimmGi-MDudUX3R44VtdQPvOXUHgx43DDD1NsDOwDn5QtrA-pvrfyT-Ijs6GcH4R66XPYaIm_ASHSEPCupK0ZW6VFjiWx3goGtCKG-TQlaGyq-iQ_ZBRJksJf6xIN8bFC1HqODePm3yDbtum2hbxwuZGtBQ0DcgkH4in4TWKwe8qrk37cl5TOkRx1yyhh9Jkhigmu6NuTvCk6ic-aappIR2P9iBB-g3W33-HVutXqqWfd0DXQb5w' \
  --data '{< JSON body the service expects to receive>}'