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remote_json.go
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remote_json.go
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// Copyright © 2023 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package authz
import (
"bytes"
"crypto/sha256"
"encoding/json"
"fmt"
"net/http"
"text/template"
"time"
"github.com/pkg/errors"
"github.com/ory/x/httpx"
"github.com/ory/x/otelx"
"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/pipeline/authn"
"github.com/ory/oathkeeper/x"
)
// AuthorizerRemoteJSONConfiguration represents a configuration for the remote_json authorizer.
type AuthorizerRemoteJSONConfiguration struct {
Remote string `json:"remote"`
Headers map[string]string `json:"headers"`
Payload string `json:"payload"`
ForwardResponseHeadersToUpstream []string `json:"forward_response_headers_to_upstream"`
Retry *AuthorizerRemoteJSONRetryConfiguration `json:"retry"`
}
type AuthorizerRemoteJSONRetryConfiguration struct {
Timeout string `json:"max_delay"`
MaxWait string `json:"give_up_after"`
}
// PayloadTemplateID returns a string with which to associate the payload template.
func (c *AuthorizerRemoteJSONConfiguration) PayloadTemplateID() string {
return fmt.Sprintf("%x", sha256.Sum256([]byte(c.Payload)))
}
// AuthorizerRemoteJSON implements the Authorizer interface.
type AuthorizerRemoteJSON struct {
c configuration.Provider
client *http.Client
t *template.Template
tracer trace.Tracer
}
// NewAuthorizerRemoteJSON creates a new AuthorizerRemoteJSON.
func NewAuthorizerRemoteJSON(c configuration.Provider, d interface{ Tracer() trace.Tracer }) *AuthorizerRemoteJSON {
return &AuthorizerRemoteJSON{
c: c,
client: httpx.NewResilientClient(httpx.ResilientClientWithTracer(d.Tracer())).StandardClient(),
t: x.NewTemplate("remote_json"),
tracer: d.Tracer(),
}
}
// GetID implements the Authorizer interface.
func (a *AuthorizerRemoteJSON) GetID() string {
return "remote_json"
}
// Authorize implements the Authorizer interface.
func (a *AuthorizerRemoteJSON) Authorize(r *http.Request, session *authn.AuthenticationSession, config json.RawMessage, rl pipeline.Rule) (err error) {
ctx, span := a.tracer.Start(r.Context(), "pipeline.authz.AuthorizerRemoteJSON.Authorize")
defer otelx.End(span, &err)
r = r.WithContext(ctx)
c, err := a.Config(config)
if err != nil {
return err
}
templateID := c.PayloadTemplateID()
t := a.t.Lookup(templateID)
if t == nil {
var err error
t, err = a.t.New(templateID).Parse(c.Payload)
if err != nil {
return errors.WithStack(err)
}
}
var body bytes.Buffer
if err := t.Execute(&body, session); err != nil {
return errors.WithStack(err)
}
var j json.RawMessage
if err := json.Unmarshal(body.Bytes(), &j); err != nil {
return errors.Wrap(err, "payload is not a JSON text")
}
req, err := http.NewRequestWithContext(r.Context(), "POST", c.Remote, &body)
if err != nil {
return errors.WithStack(err)
}
req.Header.Add("Content-Type", "application/json")
authz := r.Header.Get("Authorization")
if authz != "" {
req.Header.Add("Authorization", authz)
}
for hdr, templateString := range c.Headers {
var tmpl *template.Template
var err error
templateId := fmt.Sprintf("%s:%s", rl.GetID(), hdr)
tmpl = a.t.Lookup(templateId)
if tmpl == nil {
tmpl, err = a.t.New(templateId).Parse(templateString)
if err != nil {
return errors.Wrapf(err, `booo error parsing headers template "%s" in rule "%s"`, templateString, rl.GetID())
}
}
headerValue := bytes.Buffer{}
err = tmpl.Execute(&headerValue, session)
if err != nil {
return errors.Wrapf(err, `error executing headers template "%s" in rule "%s"`, templateString, rl.GetID())
}
// Don't send empty headers
if headerValue.String() == "" {
continue
}
req.Header.Set(hdr, headerValue.String())
}
res, err := a.client.Do(req.WithContext(r.Context()))
if err != nil {
return errors.WithStack(err)
}
defer res.Body.Close()
if res.StatusCode == http.StatusForbidden {
return errors.WithStack(helper.ErrForbidden)
} else if res.StatusCode != http.StatusOK {
return errors.Errorf("expected status code %d but got %d", http.StatusOK, res.StatusCode)
}
for _, allowedHeader := range c.ForwardResponseHeadersToUpstream {
session.SetHeader(allowedHeader, res.Header.Get(allowedHeader))
}
return nil
}
// Validate implements the Authorizer interface.
func (a *AuthorizerRemoteJSON) Validate(config json.RawMessage) error {
if !a.c.AuthorizerIsEnabled(a.GetID()) {
return NewErrAuthorizerNotEnabled(a)
}
_, err := a.Config(config)
return err
}
// Config merges config and the authorizer's configuration and validates the
// resulting configuration. It reports an error if the configuration is invalid.
func (a *AuthorizerRemoteJSON) Config(config json.RawMessage) (*AuthorizerRemoteJSONConfiguration, error) {
var c AuthorizerRemoteJSONConfiguration
if err := a.c.AuthorizerConfig(a.GetID(), config, &c); err != nil {
return nil, NewErrAuthorizerMisconfigured(a, err)
}
if c.ForwardResponseHeadersToUpstream == nil {
c.ForwardResponseHeadersToUpstream = []string{}
}
duration, err := time.ParseDuration(c.Retry.Timeout)
if err != nil {
return nil, err
}
maxWait, err := time.ParseDuration(c.Retry.MaxWait)
if err != nil {
return nil, err
}
timeout := time.Millisecond * duration
a.client = httpx.NewResilientClient(
httpx.ResilientClientWithMaxRetryWait(maxWait),
httpx.ResilientClientWithConnectionTimeout(timeout),
httpx.ResilientClientWithTracer(a.tracer),
).StandardClient()
return &c, nil
}