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revoke.go
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revoke.go
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package main
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/coreos/go-oidc"
"github.com/pkg/errors"
"golang.org/x/oauth2"
)
// revocationEndpoint parses the OIDC Provider claims from the discovery document
// and tries to find the revocation_endpoint.
func revocationEndpoint(p *oidc.Provider) (string, error) {
claims := struct {
RevocationEndpoint string `json:"revocation_endpoint"`
}{}
if err := p.Claims(&claims); err != nil {
return "", errors.Wrap(err, "Error unmarshalling provider doc into struct")
}
if claims.RevocationEndpoint == "" {
return "", errors.New("Provider doesn't have a revocation_endpoint")
}
return claims.RevocationEndpoint, nil
}
// revokeTokens is a helper that takes an oauth2.Token and revokes the access and refresh tokens.
// If no tokens are found, it succeeds.
func revokeTokens(ctx context.Context, revocationEndpoint string, token *oauth2.Token, clientID, clientSecret string) error {
if token.AccessToken != "" {
err := revokeToken(ctx, revocationEndpoint, token.AccessToken, "access_token", clientID, clientSecret)
if err != nil {
return errors.Wrap(err, "Failed to revoke access token")
}
}
if token.RefreshToken != "" {
err := revokeToken(ctx, revocationEndpoint, token.RefreshToken, "refresh_token", clientID, clientSecret)
if err != nil {
return errors.Wrap(err, "Failed to revoke refresh token")
}
}
return nil
}
// revokeToken takes care of revoking an access/refresh token to the IdP.
// The revocation procedure is described in RFC7009:
// https://tools.ietf.org/html/rfc7009
func revokeToken(ctx context.Context, revocationEndpoint string, token, tokenType, clientID, clientSecret string) error {
// Verify revocation_endpoint has https url
if !strings.HasPrefix(revocationEndpoint, "https") {
return errors.New(fmt.Sprintf("Revocation endpoint (%v) MUST use https", revocationEndpoint))
}
values := url.Values{}
values.Set("token", token)
values.Set("token_type_hint", tokenType)
req, err := http.NewRequest(http.MethodPost, revocationEndpoint, strings.NewReader(values.Encode()))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
// We only support basic auth now, we may need to support other methods in the future
// See: https://github.com/golang/oauth2/blob/bf48bf16ab8d622ce64ec6ce98d2c98f916b6303/internal/token.go#L204-L215
req.SetBasicAuth(clientID, clientSecret)
resp, err := doRequest(ctx, req)
if err != nil {
return errors.Wrap(err, "Error contacting revocation endpoint")
}
if code := resp.StatusCode; code != 200 {
// Read body to include in error for debugging purposes.
// According to RFC6749 (https://tools.ietf.org/html/rfc6749#section-5.2)
// the body should be in JSON, if we want to parse it in the future.
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return &requestError{
Response: resp,
Body: body,
Err: errors.New(fmt.Sprintf("Revocation endpoint returned code %v, failed to read body: %v", code, err)),
}
}
return &requestError{
Response: resp,
Body: body,
Err: errors.New(fmt.Sprintf("Revocation endpoint returned code %v, server returned: %v", code, body)),
}
}
return nil
}