mcp: client registration/token fixes (#5649)

## Summary

Fixes to MCP code registration and token requests. 

1. ease some requirements on fields that are RECOMMENDED 
2. fill in defaults
3. store both request and response in the client registration
4. check client secret in the /token request

## Related issues

- Fixes
https://linear.app/pomerium/issue/ENG-2462/mcp-ignore-unknown-grant-types-in-the-client-registration
- Fixes
https://linear.app/pomerium/issue/ENG-2461/mcp-support-client-secret-in-dynamic-client-registration
 
## User Explanation

<!-- How would you explain this change to the user? If this
change doesn't create any user-facing changes, you can leave
this blank. If filled out, add the `docs` label -->

## Checklist

- [x] reference any related issues
- [x] updated unit tests
- [x] add appropriate label (`enhancement`, `bug`, `breaking`,
`dependencies`, `ci`)
- [ ] ready for review
This commit is contained in:
Denis Mishin 2025-06-11 08:28:24 -07:00 committed by GitHub
parent 200f2e8164
commit 777b3b12d2
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
20 changed files with 1440 additions and 461 deletions

View file

@ -43,8 +43,9 @@ type AuthorizationRequest struct {
State *string `protobuf:"bytes,4,opt,name=state,proto3,oneof" json:"state,omitempty"`
// OPTIONAL. The scope of the access request as described by Section 1.4.1.
Scopes []string `protobuf:"bytes,5,rep,name=scopes,proto3" json:"scopes,omitempty"`
// REQUIRED, assumes https://www.rfc-editor.org/rfc/rfc7636.html#section-4.1
CodeChallenge string `protobuf:"bytes,6,opt,name=code_challenge,json=codeChallenge,proto3" json:"code_challenge,omitempty"`
// REQUIRED or RECOMMENDED, assumes https://www.rfc-editor.org/rfc/rfc7636.html#section-4.1
// subject to whether the client is public or confidential.
CodeChallenge *string `protobuf:"bytes,6,opt,name=code_challenge,json=codeChallenge,proto3,oneof" json:"code_challenge,omitempty"`
// OPTIONAL, defaults to plain if not present in the request. Code verifier
// transformation method is S256 or plain.
CodeChallengeMethod *string `protobuf:"bytes,7,opt,name=code_challenge_method,json=codeChallengeMethod,proto3,oneof" json:"code_challenge_method,omitempty"`
@ -124,8 +125,8 @@ func (x *AuthorizationRequest) GetScopes() []string {
}
func (x *AuthorizationRequest) GetCodeChallenge() string {
if x != nil {
return x.CodeChallenge
if x != nil && x.CodeChallenge != nil {
return *x.CodeChallenge
}
return ""
}
@ -158,7 +159,7 @@ var file_authorization_request_proto_rawDesc = string([]byte{
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var (