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authenticator_bearer_token.go
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/
authenticator_bearer_token.go
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// Copyright © 2023 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package authn
import (
"encoding/json"
"net/http"
"github.com/pkg/errors"
"github.com/tidwall/gjson"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel/trace"
"github.com/ory/oathkeeper/driver/configuration"
"github.com/ory/oathkeeper/helper"
"github.com/ory/oathkeeper/pipeline"
"github.com/ory/oathkeeper/x/header"
"github.com/ory/x/stringsx"
)
func init() {
gjson.AddModifier("this", func(json, arg string) string {
return json
})
}
type AuthenticatorBearerTokenFilter struct {
}
type AuthenticatorBearerTokenConfiguration struct {
CheckSessionURL string `json:"check_session_url"`
BearerTokenLocation *helper.BearerTokenLocation `json:"token_from"`
PreserveQuery bool `json:"preserve_query"`
PreservePath bool `json:"preserve_path"`
PreserveHost bool `json:"preserve_host"`
ExtraFrom string `json:"extra_from"`
SubjectFrom string `json:"subject_from"`
ForwardHTTPHeaders []string `json:"forward_http_headers"`
SetHeaders map[string]string `json:"additional_headers"`
ForceMethod string `json:"force_method"`
}
func (a *AuthenticatorBearerTokenConfiguration) GetCheckSessionURL() string {
return a.CheckSessionURL
}
func (a *AuthenticatorBearerTokenConfiguration) GetPreserveQuery() bool {
return a.PreserveQuery
}
func (a *AuthenticatorBearerTokenConfiguration) GetPreservePath() bool {
return a.PreservePath
}
func (a *AuthenticatorBearerTokenConfiguration) GetPreserveHost() bool {
return a.PreserveHost
}
func (a *AuthenticatorBearerTokenConfiguration) GetForwardHTTPHeaders() []string {
return a.ForwardHTTPHeaders
}
func (a *AuthenticatorBearerTokenConfiguration) GetSetHeaders() map[string]string {
return a.SetHeaders
}
func (a *AuthenticatorBearerTokenConfiguration) GetForceMethod() string {
return a.ForceMethod
}
type AuthenticatorBearerToken struct {
c configuration.Provider
client *http.Client
}
var _ AuthenticatorForwardConfig = new(AuthenticatorBearerTokenConfiguration)
func NewAuthenticatorBearerToken(c configuration.Provider, provider trace.TracerProvider) *AuthenticatorBearerToken {
return &AuthenticatorBearerToken{
c: c,
client: &http.Client{
Transport: otelhttp.NewTransport(
http.DefaultTransport,
otelhttp.WithTracerProvider(provider),
otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string { return "authn.bearer_token" })),
},
}
}
func (a *AuthenticatorBearerToken) GetID() string {
return "bearer_token"
}
func (a *AuthenticatorBearerToken) Validate(config json.RawMessage) error {
if !a.c.AuthenticatorIsEnabled(a.GetID()) {
return NewErrAuthenticatorNotEnabled(a)
}
_, err := a.Config(config)
return err
}
func (a *AuthenticatorBearerToken) Config(config json.RawMessage) (*AuthenticatorBearerTokenConfiguration, error) {
var c AuthenticatorBearerTokenConfiguration
if err := a.c.AuthenticatorConfig(a.GetID(), config, &c); err != nil {
return nil, NewErrAuthenticatorMisconfigured(a, err)
}
if len(c.ExtraFrom) == 0 {
c.ExtraFrom = "extra"
}
if len(c.SubjectFrom) == 0 {
c.SubjectFrom = "sub"
}
// Add Authorization and Cookie headers for backward compatibility
c.ForwardHTTPHeaders = append(c.ForwardHTTPHeaders, []string{header.Authorization}...)
return &c, nil
}
func (a *AuthenticatorBearerToken) Authenticate(r *http.Request, session *AuthenticationSession, config json.RawMessage, _ pipeline.Rule) error {
cf, err := a.Config(config)
if err != nil {
return err
}
token := helper.BearerTokenFromRequest(r, cf.BearerTokenLocation)
if token == "" {
return errors.WithStack(ErrAuthenticatorNotResponsible)
}
body, err := forwardRequestToSessionStore(a.client, r, cf)
if err != nil {
return err
}
var (
subject string
extra map[string]interface{}
subjectRaw = []byte(stringsx.Coalesce(gjson.GetBytes(body, cf.SubjectFrom).Raw, "null"))
extraRaw = []byte(stringsx.Coalesce(gjson.GetBytes(body, cf.ExtraFrom).Raw, "null"))
)
if err = json.Unmarshal(subjectRaw, &subject); err != nil {
return helper.ErrForbidden.WithReasonf("The configured subject_from GJSON path returned an error on JSON output: %s", err.Error()).WithDebugf("GJSON path: %s\nBody: %s\nResult: %s", cf.SubjectFrom, body, subjectRaw).WithTrace(err)
}
if err = json.Unmarshal(extraRaw, &extra); err != nil {
return helper.ErrForbidden.WithReasonf("The configured extra_from GJSON path returned an error on JSON output: %s", err.Error()).WithDebugf("GJSON path: %s\nBody: %s\nResult: %s", cf.ExtraFrom, body, extraRaw).WithTrace(err)
}
session.Subject = subject
session.Extra = extra
return nil
}