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support verification with gaia-x registry
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,6 @@ | ||
| # Check trust anchor | ||
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| allow to configure for a credential the registry to be used | ||
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| -> check linked certificate chain at <registry>/api/trustAnchor/chain/file | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package gaiax | ||
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| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "errors" | ||
| "net/http" | ||
| "strings" | ||
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| "github.com/fiware/VCVerifier/common" | ||
| "github.com/fiware/VCVerifier/logging" | ||
| "github.com/trustbloc/did-go/doc/did" | ||
| "github.com/trustbloc/did-go/vdr" | ||
| ) | ||
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| const GAIAX_REGISTRY_TRUSTANCHOR_FILE = "/v2/api/trustAnchor/chain/file" | ||
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| var ErrorUnresolvableDid = errors.New("unresolvable_did") | ||
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| /** | ||
| * A client to retrieve infromation from EBSI-compatible TrustedIssuerRegistry APIs. | ||
| */ | ||
| type GaiaXHttpClient struct { | ||
| client common.HttpClient | ||
| // TODO: check if needed | ||
| didCache common.Cache | ||
| didRegistry *vdr.Registry | ||
| } | ||
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| func (ghc GaiaXHttpClient) IsTrustedParticipant(registryEndpoint string, did string) (trusted bool) { | ||
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| // 1. get jwk from did | ||
| didDocument, err := ghc.resolveIssuer(did) | ||
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| if err != nil { | ||
| return false | ||
| } | ||
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| // 2. verify at the registry | ||
| for _, verficationMethod := range didDocument.DIDDocument.VerificationMethod { | ||
| if verficationMethod.ID == did { | ||
| return ghc.verifiyIssuer(registryEndpoint, verficationMethod) | ||
| } | ||
| } | ||
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| return false | ||
| } | ||
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| func (ghc GaiaXHttpClient) verifiyIssuer(registryEndpoint string, verificationMethod did.VerificationMethod) (trusted bool) { | ||
| jwk := verificationMethod.JSONWebKey() | ||
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| if jwk.CertificatesURL != nil { | ||
| return ghc.verifyFileChain(registryEndpoint, jwk.CertificatesURL.String()) | ||
| } | ||
| // gaia-x did-json need to provide an x5u, thus x5c checks should not be required. | ||
| return false | ||
| } | ||
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| func (ghc GaiaXHttpClient) verifyFileChain(registryEndpoint string, x5u string) (trusted bool) { | ||
| requestBody := FileChainRequest{Uri: x5u} | ||
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| encodedRequest, err := json.Marshal(requestBody) | ||
| if err != nil { | ||
| logging.Log().Warnf("Was not able to build a valid certificate check bode. E: %v", err) | ||
| return false | ||
| } | ||
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| request, err := http.NewRequest("POST", buildURL(registryEndpoint, GAIAX_REGISTRY_TRUSTANCHOR_FILE), bytes.NewBuffer(encodedRequest)) | ||
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| response, err := ghc.client.Do(request) | ||
| if err != nil { | ||
| logging.Log().Infof("Was not able to check cert chain %s at %s. E: %v", x5u, registryEndpoint, err) | ||
| return false | ||
| } | ||
| defer response.Body.Close() | ||
| if response.StatusCode != 200 { | ||
| logging.Log().Infof("x5u %s was not verified to be a trust anchor at %s.", x5u, registryEndpoint) | ||
| return false | ||
| } | ||
| // according to the doc, all 200s are valid chains, thus no need to parse the body | ||
| return true | ||
| } | ||
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| func (ghc GaiaXHttpClient) resolveIssuer(did string) (didDocument *did.DocResolution, err error) { | ||
| didDocument, err = ghc.didRegistry.Resolve(did) | ||
| if err != nil { | ||
| logging.Log().Warnf("Was not able to resolve the issuer %s.", did) | ||
| return nil, ErrorUnresolvableDid | ||
| } | ||
| return didDocument, err | ||
| } | ||
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| func buildURL(host, path string) string { | ||
| return strings.TrimSuffix(host, "/") + "/" + strings.TrimPrefix(path, "/") | ||
| } | ||
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| type FileChainRequest struct { | ||
| Uri string `json:"uri"` | ||
| } | ||
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| type CertChainRequest struct { | ||
| Certs string `json:"certs"` | ||
| } | ||
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| type VerificationResult struct { | ||
| Result bool `json:"result"` | ||
| } |
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