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Updated README 

... to discuss recently published vulnerability
This commit is contained in:
Dave Grijalva 2015-04-01 11:06:36 -07:00
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README.md
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@ -1,6 +1,6 @@
A [go](http://www.golang.org) (or 'golang' for search engine friendliness) implementation of [JSON Web Tokens](http://self-issued.info/docs/draft-jones-json-web-token.html) A [go](http://www.golang.org) (or 'golang' for search engine friendliness) implementation of [JSON Web Tokens](http://self-issued.info/docs/draft-jones-json-web-token.html)
**NOTICE:** We recently introduced a breaking change in the API. Please refer to [VERSION_HISTORY.md](VERSION_HISTORY.md) for details. **NOTICE:** A vulnerability in JWT was [recently published](https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/). As this library doesn't force users to validate the `alg` is what they expected, it's possible your usage is effected. There will be an update soon to remedy this, and it will likey require backwards-incompatible changes to the API. In the short term, please make sure your implementation verifies the `alg` is what you expect.
## What the heck is a JWT? ## What the heck is a JWT?
@ -20,6 +20,10 @@ Parsing and verifying tokens is pretty straight forward. You pass in the token
```go ```go
token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) { token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := t.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", t.Header["alg"])
}
return myLookupKey(token.Header["kid"]) return myLookupKey(token.Header["kid"])
}) })