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Implement JWT-based authentication for secure route
This copies much JWKS helper code (`cmd/cloud-init-server/auth.go`) from https://github.com/OpenCHAMI/smd/blob/cdac4f1a606401a2b150513b935143238e3eb026/cmd/smd/routers.go with certain irrelevant-to-us parts stripped out.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package main | ||
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| // Adapted from OpenCHAMI SMD's auth.go | ||
|
|
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| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
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| jwtauth "github.com/OpenCHAMI/jwtauth/v5" | ||
| "github.com/lestrrat-go/jwx/v2/jwk" | ||
| ) | ||
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| type statusCheckTransport struct { | ||
| http.RoundTripper | ||
| } | ||
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| func (ct *statusCheckTransport) RoundTrip(req *http.Request) (*http.Response, error) { | ||
| resp, err := http.DefaultTransport.RoundTrip(req) | ||
| if err == nil && resp.StatusCode != http.StatusOK { | ||
| return nil, fmt.Errorf("status code: %d", resp.StatusCode) | ||
| } | ||
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| return resp, err | ||
| } | ||
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| func newHTTPClient() *http.Client { | ||
| return &http.Client{Transport: &statusCheckTransport{}} | ||
| } | ||
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| func fetchPublicKeyFromURL(url string) (*jwtauth.JWTAuth, error) { | ||
| client := newHTTPClient() | ||
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| ctx, cancel := context.WithCancel(context.Background()) | ||
| defer cancel() | ||
| set, err := jwk.Fetch(ctx, url, jwk.WithHTTPClient(client)) | ||
| if err != nil { | ||
| msg := "%w" | ||
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| // if the error tree contains an EOF, it means that the response was empty, | ||
| // so add a more descriptive message to the error tree | ||
| if errors.Is(err, io.EOF) { | ||
| msg = "received empty response for key: %w" | ||
| } | ||
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| return nil, fmt.Errorf(msg, err) | ||
| } | ||
| jwks, err := json.Marshal(set) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to marshal JWKS: %v", err) | ||
| } | ||
| keyset, err := jwtauth.NewKeySet(jwks) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to initialize JWKS: %v", err) | ||
| } | ||
|
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| return keyset, nil | ||
| } |
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