133 lines
3.6 KiB
Go
133 lines
3.6 KiB
Go
/*
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Copyright 2020, 2021 Jan Dittberner
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package services
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import (
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"bytes"
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"context"
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"encoding/json"
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"net/http"
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"net/url"
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"github.com/lestrrat-go/jwx/jwk"
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log "github.com/sirupsen/logrus"
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"golang.org/x/oauth2"
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"git.cacert.org/oidc_login/common/models"
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)
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type oidcContextKey int
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// context keys
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const (
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ctxOidcConfig oidcContextKey = iota
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ctxOAuth2Config
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ctxOidcJwks
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)
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// Parameters for DiscoverOIDC
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type OidcParams struct {
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OidcServer string
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OidcClientId string
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OidcClientSecret string
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APIClient *http.Client
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}
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// Discover OpenID Connect parameters from the discovery endpoint and the
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// JSON Web Key Set from the discovered jwksUri.
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//
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// The subset of values specified by models.OpenIDConfiguration is stored in
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// the given context and can be retrieved from the context by GetOidcConfig.
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//
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// OAuth2 specific values are stored in another context object and can be
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// retrieved by GetOAuth2Config.
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//
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// The JSON Web Key Set can be retrieved by GetJwkSet.
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func DiscoverOIDC(ctx context.Context, logger *log.Logger, params *OidcParams) (context.Context, error) {
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var discoveryUrl *url.URL
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discoveryUrl, err := url.Parse(params.OidcServer)
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if err != nil {
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logger.Fatalf("could not parse oidc.server parameter value %s: %s", params.OidcServer, err)
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} else {
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discoveryUrl.Path = "/.well-known/openid-configuration"
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}
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var body []byte
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var req *http.Request
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req, err = http.NewRequest(http.MethodGet, discoveryUrl.String(), bytes.NewBuffer(body))
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if err != nil {
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return nil, err
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}
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req.Header = map[string][]string{
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"Accept": {"application/json"},
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}
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resp, err := params.APIClient.Do(req)
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if err != nil {
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return nil, err
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}
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dec := json.NewDecoder(resp.Body)
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discoveryResponse := &models.OpenIDConfiguration{}
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err = dec.Decode(discoveryResponse)
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if err != nil {
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return nil, err
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}
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ctx = context.WithValue(ctx, ctxOidcConfig, discoveryResponse)
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oauth2Config := &oauth2.Config{
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ClientID: params.OidcClientId,
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ClientSecret: params.OidcClientSecret,
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Endpoint: oauth2.Endpoint{
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AuthURL: discoveryResponse.AuthorizationEndpoint,
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TokenURL: discoveryResponse.TokenEndpoint,
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},
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Scopes: []string{"openid", "offline"},
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}
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ctx = context.WithValue(ctx, ctxOAuth2Config, oauth2Config)
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keySet, err := jwk.Fetch(ctx, discoveryResponse.JwksUri, jwk.WithHTTPClient(params.APIClient))
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if err != nil {
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log.Fatalf("could not fetch JWKs: %s", err)
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}
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ctx = context.WithValue(ctx, ctxOidcJwks, keySet)
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return ctx, nil
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}
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// Get the OpenID configuration from the context.
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//
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// DiscoverOIDC needs to be called before this is available.
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func GetOidcConfig(ctx context.Context) *models.OpenIDConfiguration {
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return ctx.Value(ctxOidcConfig).(*models.OpenIDConfiguration)
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}
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// Get the OAuth 2 configuration configuration from the context.
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//
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// DiscoverOIDC needs to be called before this is available.
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func GetOAuth2Config(ctx context.Context) *oauth2.Config {
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return ctx.Value(ctxOAuth2Config).(*oauth2.Config)
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}
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// Get the JSON Web Key set from the context.
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//
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// DiscoverOIDC needs to be called before this is available.
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func GetJwkSet(ctx context.Context) jwk.Set {
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return ctx.Value(ctxOidcJwks).(jwk.Set)
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}
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