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Signed-off-by: Austen Lacy <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* | ||
| Copyright 2023 The Vitess Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package acl | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
|
|
||
| keyfunc "github.com/MicahParks/keyfunc/v2" | ||
| jwt "github.com/golang-jwt/jwt/v5" | ||
| ) | ||
|
|
||
| const ( | ||
| SHOPIFY_JWT = "shopify_jwt" | ||
| SHOPIFY_COOKIE_NAME_ENV = "JWT_COOKIE_NAME" | ||
| SHOPIFY_JWKS_URL_ENV = "JWKS_URL" | ||
| ) | ||
|
|
||
| var errDenyShopifyJwt = errors.New("not allowed: shopify_jwt security_policy enforced") | ||
|
|
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| func jwksRequestFactory(ctx context.Context, url string) (*http.Request, error) { | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, bytes.NewReader(nil)) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| req.Header.Set("Accept", "application/json") | ||
| return req, nil | ||
| } | ||
|
|
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| type shopifyJwt struct{} | ||
|
|
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| func validateJWT(tokenString string, jwksURL string) (bool, error) { | ||
| // Fetch the JWKS from the provided URL | ||
| jwks, err := keyfunc.Get(jwksURL, keyfunc.Options{ | ||
| RequestFactory: jwksRequestFactory, | ||
| }) | ||
|
|
||
| defer jwks.EndBackground() | ||
|
|
||
| if err != nil { | ||
| return false, err | ||
| } | ||
|
|
||
| // Parse and validate the JWT token | ||
| token, err := jwt.Parse(tokenString, jwks.Keyfunc) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to parse JWT token: %v", err) | ||
| } | ||
|
|
||
| if token.Valid { | ||
| return true, nil | ||
| } | ||
|
|
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| return false, nil | ||
| } | ||
|
|
||
| // CheckAccessActor disallows actor access not verified by shopifyJwt | ||
| func (shopifyJwt) CheckAccessActor(actor, role string) error { | ||
| switch role { | ||
| case SHOPIFY_JWT: | ||
| return nil | ||
| default: | ||
| return errDenyShopifyJwt | ||
| } | ||
| } | ||
|
|
||
| // CheckAccessHTTP disallows HTTP access not verified by shopifyJwt | ||
| func (shopifyJwt) CheckAccessHTTP(req *http.Request, role string) error { | ||
| switch role { | ||
| case SHOPIFY_JWT: | ||
| jwtCookie, err := req.Cookie(os.Getenv("SHOPIFY_COOKIE_NAME_ENV")) | ||
|
|
||
| if err != nil { | ||
| log.Printf("failed to get jwt token from cookie: %s", err) | ||
| return err | ||
| } | ||
|
|
||
| _, err = validateJWT(jwtCookie.Value, os.Getenv(SHOPIFY_JWKS_URL_ENV)) | ||
|
|
||
| if err != nil { | ||
| log.Printf("invalid JWT token provided: %s", err) | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| default: | ||
| return errDenyShopifyJwt | ||
| } | ||
| } | ||
|
|
||
| func init() { | ||
| RegisterPolicy(SHOPIFY_JWT, shopifyJwt{}) | ||
| } |
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