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Use signedxml to create and validate signatures
Message signing is limited to RSA
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,103 +1,71 @@ | ||
| package saml | ||
|
|
||
| import ( | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
| "errors" | ||
| "io/ioutil" | ||
| "os" | ||
| "os/exec" | ||
| "strings" | ||
| ) | ||
|
|
||
| const ( | ||
| xmlResponseID = "urn:oasis:names:tc:SAML:2.0:protocol:Response" | ||
| xmlRequestID = "urn:oasis:names:tc:SAML:2.0:protocol:AuthnRequest" | ||
| "github.com/ma314smith/signedxml" | ||
| ) | ||
|
|
||
| // SignRequest sign a SAML 2.0 AuthnRequest | ||
| // `privateKeyPath` must be a path on the filesystem, xmlsec1 is run out of process | ||
| // through `exec` | ||
| func SignRequest(xml string, privateKeyPath string) (string, error) { | ||
| return sign(xml, privateKeyPath, xmlRequestID) | ||
| } | ||
|
|
||
| // SignResponse sign a SAML 2.0 Response | ||
| // `privateKeyPath` must be a path on the filesystem, xmlsec1 is run out of process | ||
| // through `exec` | ||
| func SignResponse(xml string, privateKeyPath string) (string, error) { | ||
| return sign(xml, privateKeyPath, xmlResponseID) | ||
| } | ||
|
|
||
| func sign(xml string, privateKeyPath string, id string) (string, error) { | ||
|
|
||
| samlXmlsecInput, err := ioutil.TempFile(os.TempDir(), "tmpgs") | ||
| // Sign creates a signature for an XML document and returns it | ||
| func Sign(xml string, privateKeyPath string) (string, error) { | ||
| pemString, err := ioutil.ReadFile(privateKeyPath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer deleteTempFile(samlXmlsecInput.Name()) | ||
| samlXmlsecInput.WriteString("<?xml version='1.0' encoding='UTF-8'?>\n") | ||
| samlXmlsecInput.WriteString(xml) | ||
| samlXmlsecInput.Close() | ||
|
|
||
| samlXmlsecOutput, err := ioutil.TempFile(os.TempDir(), "tmpgs") | ||
| pemBlock, _ := pem.Decode([]byte(pemString)) | ||
| if pemBlock == nil { | ||
| return "", errors.New("Count not parse private key") | ||
| } | ||
|
|
||
| key, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer deleteTempFile(samlXmlsecOutput.Name()) | ||
| samlXmlsecOutput.Close() | ||
|
|
||
| // fmt.Println("xmlsec1", "--sign", "--privkey-pem", privateKeyPath, | ||
| // "--id-attr:ID", id, | ||
| // "--output", samlXmlsecOutput.Name(), samlXmlsecInput.Name()) | ||
| output, err := exec.Command("xmlsec1", "--sign", "--privkey-pem", privateKeyPath, | ||
| "--id-attr:ID", id, | ||
| "--output", samlXmlsecOutput.Name(), samlXmlsecInput.Name()).CombinedOutput() | ||
| signer, err := signedxml.NewSigner(xml) | ||
| if err != nil { | ||
| return "", errors.New(err.Error() + " : " + string(output)) | ||
| return "", err | ||
| } | ||
|
|
||
| samlSignedRequest, err := ioutil.ReadFile(samlXmlsecOutput.Name()) | ||
| samlSignedRequestXML, err := signer.Sign(key) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| samlSignedRequestXML := strings.Trim(string(samlSignedRequest), "\n") | ||
|
|
||
| return samlSignedRequestXML, nil | ||
| } | ||
|
|
||
| // VerifyResponseSignature verify signature of a SAML 2.0 Response document | ||
| // `publicCertPath` must be a path on the filesystem, xmlsec1 is run out of process | ||
| // through `exec` | ||
| func VerifyResponseSignature(xml string, publicCertPath string) error { | ||
| return verify(xml, publicCertPath, xmlResponseID) | ||
| } | ||
| // Verify validates the signature of an XML document | ||
| func Verify(xml string, publicCertPath string) error { | ||
| pemString, err := ioutil.ReadFile(publicCertPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // VerifyRequestSignature verify signature of a SAML 2.0 AuthnRequest document | ||
| // `publicCertPath` must be a path on the filesystem, xmlsec1 is run out of process | ||
| // through `exec` | ||
| func VerifyRequestSignature(xml string, publicCertPath string) error { | ||
| return verify(xml, publicCertPath, xmlRequestID) | ||
| } | ||
| pemBlock, _ := pem.Decode([]byte(pemString)) | ||
| if pemBlock == nil { | ||
| return errors.New("Could not parse certificate") | ||
| } | ||
|
|
||
| func verify(xml string, publicCertPath string, id string) error { | ||
| //Write saml to | ||
| samlXmlsecInput, err := ioutil.TempFile(os.TempDir(), "tmpgs") | ||
| cert, err := x509.ParseCertificate(pemBlock.Bytes) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| samlXmlsecInput.WriteString(xml) | ||
| samlXmlsecInput.Close() | ||
| defer deleteTempFile(samlXmlsecInput.Name()) | ||
| validator, err := signedxml.NewValidator(xml) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| validator.Certificates = append(validator.Certificates, *cert) | ||
|
|
||
| //fmt.Println("xmlsec1", "--verify", "--pubkey-cert-pem", publicCertPath, "--id-attr:ID", id, samlXmlsecInput.Name()) | ||
| _, err = exec.Command("xmlsec1", "--verify", "--pubkey-cert-pem", publicCertPath, "--id-attr:ID", id, samlXmlsecInput.Name()).CombinedOutput() | ||
| err = validator.Validate() | ||
| if err != nil { | ||
| return errors.New("error verifing signature: " + err.Error()) | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // deleteTempFile remove a file and ignore error | ||
| // Intended to be called in a defer after the creation of a temp file to ensure cleanup | ||
| func deleteTempFile(filename string) { | ||
| _ = os.Remove(filename) | ||
| } |
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