internal/oauthex: fix GetProtectedResourceMetadataFromHeader validation #561
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samthanawalla
requested changes
Oct 7, 2025
oauthex/resource_meta.go
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| @@ -167,7 +168,7 @@ func getPRM(ctx context.Context, purl string, c *http.Client, wantResource strin | |||
| if err != nil { | |||
| return nil, err | |||
| } | |||
| // Validate the Resource field to thwart impersonation attacks (section 3.3). | |||
| // Validate the Resource field (see RFC 9728, section 3.3) as well as issue #560 | |||
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remove reference to issue #560 and end with a period
GetProtectedResourceMetadataFromHeader was validating the resource field against the metadata endpoint URL instead of the original server URL. Per RFC 9728 section 3.3, the resource field must match the URL that the client used to make the request to the resource server. Fixes: modelcontextprotocol#560 This fix adds a serverURL parameter and validates against the correct value.
samthanawalla
approved these changes
Oct 7, 2025
|
@samthanawalla are these good to merge? |
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GetProtectedResourceMetadataFromHeader was validating the resource field against the metadata endpoint URL instead of the original server URL. Per RFC 9728 section 3.3, the resource field must match the URL that the client used to make the request to the resource server.
Fixes: #560