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168 lines
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168 lines
7.6 KiB
Markdown
# jwt-go
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[](https://github.com/golang-jwt/jwt/actions/workflows/build.yml)
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[](https://pkg.go.dev/github.com/golang-jwt/jwt/v5)
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[](https://coveralls.io/github/golang-jwt/jwt?branch=main)
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A [go](http://www.golang.org) (or 'golang' for search engine friendliness)
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implementation of [JSON Web
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Tokens](https://datatracker.ietf.org/doc/html/rfc7519).
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Starting with [v4.0.0](https://github.com/golang-jwt/jwt/releases/tag/v4.0.0)
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this project adds Go module support, but maintains backwards compatibility with
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older `v3.x.y` tags and upstream `github.com/dgrijalva/jwt-go`. See the
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[`MIGRATION_GUIDE.md`](./MIGRATION_GUIDE.md) for more information. Version
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v5.0.0 introduces major improvements to the validation of tokens, but is not
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entirely backwards compatible.
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> After the original author of the library suggested migrating the maintenance
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> of `jwt-go`, a dedicated team of open source maintainers decided to clone the
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> existing library into this repository. See
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> [dgrijalva/jwt-go#462](https://github.com/dgrijalva/jwt-go/issues/462) for a
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> detailed discussion on this topic.
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**SECURITY NOTICE:** Some older versions of Go have a security issue in the
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crypto/elliptic. Recommendation is to upgrade to at least 1.15 See issue
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[dgrijalva/jwt-go#216](https://github.com/dgrijalva/jwt-go/issues/216) for more
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detail.
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**SECURITY NOTICE:** It's important that you [validate the `alg` presented is
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what you
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expect](https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/).
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This library attempts to make it easy to do the right thing by requiring key
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types match the expected alg, but you should take the extra step to verify it in
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your usage. See the examples provided.
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### Supported Go versions
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Our support of Go versions is aligned with Go's [version release
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policy](https://golang.org/doc/devel/release#policy). So we will support a major
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version of Go until there are two newer major releases. We no longer support
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building jwt-go with unsupported Go versions, as these contain security
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vulnerabilities which will not be fixed.
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## What the heck is a JWT?
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JWT.io has [a great introduction](https://jwt.io/introduction) to JSON Web
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Tokens.
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In short, it's a signed JSON object that does something useful (for example,
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authentication). It's commonly used for `Bearer` tokens in Oauth 2. A token is
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made of three parts, separated by `.`'s. The first two parts are JSON objects,
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that have been [base64url](https://datatracker.ietf.org/doc/html/rfc4648)
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encoded. The last part is the signature, encoded the same way.
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The first part is called the header. It contains the necessary information for
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verifying the last part, the signature. For example, which encryption method
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was used for signing and what key was used.
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The part in the middle is the interesting bit. It's called the Claims and
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contains the actual stuff you care about. Refer to [RFC
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7519](https://datatracker.ietf.org/doc/html/rfc7519) for information about
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reserved keys and the proper way to add your own.
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## What's in the box?
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This library supports the parsing and verification as well as the generation and
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signing of JWTs. Current supported signing algorithms are HMAC SHA, RSA,
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RSA-PSS, and ECDSA, though hooks are present for adding your own.
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## Installation Guidelines
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1. To install the jwt package, you first need to have
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[Go](https://go.dev/doc/install) installed, then you can use the command
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below to add `jwt-go` as a dependency in your Go program.
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```sh
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go get -u github.com/golang-jwt/jwt/v5
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```
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2. Import it in your code:
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```go
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import "github.com/golang-jwt/jwt/v5"
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```
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## Usage
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A detailed usage guide, including how to sign and verify tokens can be found on
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our [documentation website](https://golang-jwt.github.io/jwt/usage/create/).
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## Examples
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See [the project documentation](https://pkg.go.dev/github.com/golang-jwt/jwt/v5)
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for examples of usage:
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* [Simple example of parsing and validating a
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token](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#example-Parse-Hmac)
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* [Simple example of building and signing a
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token](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#example-New-Hmac)
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* [Directory of
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Examples](https://pkg.go.dev/github.com/golang-jwt/jwt/v5#pkg-examples)
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## Compliance
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This library was last reviewed to comply with [RFC
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7519](https://datatracker.ietf.org/doc/html/rfc7519) dated May 2015 with a few
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notable differences:
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* In order to protect against accidental use of [Unsecured
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JWTs](https://datatracker.ietf.org/doc/html/rfc7519#section-6), tokens using
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`alg=none` will only be accepted if the constant
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`jwt.UnsafeAllowNoneSignatureType` is provided as the key.
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## Project Status & Versioning
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This library is considered production ready. Feedback and feature requests are
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appreciated. The API should be considered stable. There should be very few
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backwards-incompatible changes outside of major version updates (and only with
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good reason).
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This project uses [Semantic Versioning 2.0.0](http://semver.org). Accepted pull
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requests will land on `main`. Periodically, versions will be tagged from
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`main`. You can find all the releases on [the project releases
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page](https://github.com/golang-jwt/jwt/releases).
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**BREAKING CHANGES:*** A full list of breaking changes is available in
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`VERSION_HISTORY.md`. See `MIGRATION_GUIDE.md` for more information on updating
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your code.
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## Extensions
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This library publishes all the necessary components for adding your own signing
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methods or key functions. Simply implement the `SigningMethod` interface and
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register a factory method using `RegisterSigningMethod` or provide a
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`jwt.Keyfunc`.
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A common use case would be integrating with different 3rd party signature
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providers, like key management services from various cloud providers or Hardware
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Security Modules (HSMs) or to implement additional standards.
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| Extension | Purpose | Repo |
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| --------- | -------------------------------------------------------------------------------------------------------- | ------------------------------------------ |
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| GCP | Integrates with multiple Google Cloud Platform signing tools (AppEngine, IAM API, Cloud KMS) | https://github.com/someone1/gcp-jwt-go |
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| AWS | Integrates with AWS Key Management Service, KMS | https://github.com/matelang/jwt-go-aws-kms |
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| JWKS | Provides support for JWKS ([RFC 7517](https://datatracker.ietf.org/doc/html/rfc7517)) as a `jwt.Keyfunc` | https://github.com/MicahParks/keyfunc |
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*Disclaimer*: Unless otherwise specified, these integrations are maintained by
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third parties and should not be considered as a primary offer by any of the
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mentioned cloud providers
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## More
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Go package documentation can be found [on
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pkg.go.dev](https://pkg.go.dev/github.com/golang-jwt/jwt/v5). Additional
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documentation can be found on [our project
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page](https://golang-jwt.github.io/jwt/).
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The command line utility included in this project (cmd/jwt) provides a
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straightforward example of token creation and parsing as well as a useful tool
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for debugging your own integration. You'll also find several implementation
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examples in the documentation.
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[golang-jwt](https://github.com/orgs/golang-jwt) incorporates a modified version
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of the JWT logo, which is distributed under the terms of the [MIT
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License](https://github.com/jsonwebtoken/jsonwebtoken.github.io/blob/master/LICENSE.txt).
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