Okta JWT Verifier for Golang

This library helps you verify tokens that have been issued by Okta. To learn more about verification cases and Okta's tokens please read Working With OAuth 2.0 Tokens

Release status

This library uses semantic versioning and follows Okta's library version policy.

Version	Status
0.x	⚠️ Beta Release (Retired)
1.x	✔️ Release

Installation

go get -u github.com/okta/okta-jwt-verifier-golang

Usage

This library was built to keep configuration to a minimum. To get it running at its most basic form, all you need to provide is the the following information:

• Issuer - This is the URL of the authorization server that will perform authentication. All Developer Accounts have a "default" authorization server. The issuer is a combination of your Org URL (found in the upper right of the console home page) and /oauth2/default. For example, https://dev-1234.oktapreview.com/oauth2/default.
• Client ID- These can be found on the "General" tab of the Web application that you created earlier in the Okta Developer Console.

Access Token Validation

import github.com/okta/okta-jwt-verifier-golang

toValidate := map[string]string{}
toValidate["aud"] = "api://default"
toValidate["cid"] = "{CLIENT_ID}"

jwtVerifierSetup := jwtverifier.JwtVerifier{
        Issuer: "{ISSUER}",
        ClaimsToValidate: toValidate,
}

verifier := jwtVerifierSetup.New()

token, err := verifier.VerifyAccessToken("{JWT}")

Id Token Validation

import github.com/okta/okta-jwt-verifier-golang

toValidate := map[string]string{}
toValidate["nonce"] = "{NONCE}"
toValidate["aud"] = "{CLIENT_ID}"


jwtVerifierSetup := jwtverifier.JwtVerifier{
        Issuer: "{ISSUER}",
        ClaimsToValidate: toValidate,
}

verifier := jwtVerifierSetup.New()

token, err := verifier.VerifyIdToken("{JWT}")

This will either provide you with the token which gives you access to all the claims, or an error. The token struct contains a Claims property that will give you a map[string]interface{} of all the claims in the token.

// Getting the sub from the token
sub := token.Claims["sub"]

Dealing with clock skew

We default to a two minute clock skew adjustment in our validation. If you need to change this, you can use the SetLeeway method:

jwtVerifierSetup := JwtVerifier{
        Issuer: "{ISSUER}",
}

verifier := jwtVerifierSetup.New()
verifier.SetLeeway("2m") //String instance of time that will be parsed by `time.ParseDuration`

Testing

If you create a PR from a fork of okta/okta-jwt-verifier-golang the build for the PR will fail. Don't worry, we'll bring your commits into a review branch in okta/okta-jwt-verifier-golang and get a green build.

jwtverifier_test.go expects environment variables for ISSUER, CLIENT_ID, USERNAME, and PASSWORD to be present. Take note if you use zshell as USERSNAME is a special environment variable and is not settable. Therefore tests shouldn't be run in zshell.

USERNAME and PASSWORD are for a user with access to the test app associated with CLIENT_ID. The test app should not have 2FA enabled and allow password login. The General Settings for the test app should have Application Grant type with Implicit (hybrid) enabled.

go test -test.v