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A just good enough SAML client library written in Go.

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go-saml

Build Status

Fork of Mike Brevoort's go-saml with cleaner API, bugfixes and some enhancements.

Installation

$ go get github.com/maditya/go-saml

Usage

Below are samples to show how you can use the library.

Generating Signed AuthnRequests

sp := saml.ServiceProviderConfig{
  PrivateKey: 		       ".."
  Cert: 		       ".."
  IDPSSOURL:                   "http://idp/saml2",
  IDPSSODescriptorURL:         "http://idp/issuer",
  IDPCert:		       ".."
  SPSignRequest:               true,
  AssertionConsumerServiceURL: "http://localhost:8000/saml_consume",
}

// generate the AuthnRequest and then get a base64 encoded string of the XML
authnRequest := sp.GetAuthnRequest()
b64XML, err := authnRequest.EncodedSignedString(sp.PrivateKey)
if err != nil {
  panic(err)
}

// for convenience, get a URL formed with the SAMLRequest parameter
url, err := saml.GetAuthnRequestURL(sp.IDPSSOURL, b64XML)
if err != nil {
  panic(err)
}

// below is bonus for how you might respond to a request with a form that POSTs to the IdP
data := struct {
  Base64AuthRequest string
  URL               string
}{
  Base64AuthRequest: b64XML,
  URL:               url,
}

t := template.New("saml")
t, err = t.Parse("<html><body style=\"display: none\" onload=\"document.frm.submit()\"><form method=\"post\" name=\"frm\" action=\"{{.URL}}\"><input type=\"hidden\" name=\"SAMLRequest\" value=\"{{.Base64AuthRequest}}\" /><input type=\"submit\" value=\"Submit\" /></form></body></html>")

// how you might respond to a request with the templated form that will auto post
t.Execute(w, data)

Validating a received SAML Response

response = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  encodedXML := r.FormValue("SAMLResponse")

  if encodedXML == "" {
    httpcommon.SendBadRequest(w, "SAMLResponse form value missing")
    return
  }

  response, err := saml.ParseEncodedResponse(encodedXML)
  if err != nil {
    httpcommon.SendBadRequest(w, "SAMLResponse parse: "+err.Error())
    return
  }

  err = response.Validate(&sp)
  if err != nil {
    httpcommon.SendBadRequest(w, "SAMLResponse validation: "+err.Error())
    return
  }

  samlID := response.GetAttribute("uid")
  if samlID == "" {
    httpcommon.SendBadRequest(w, "SAML attribute identifier uid missing")
    return
  }

  //...
}

Service provider metadata

func samlMetadataHandler(sp *saml.ServiceProviderConfig) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		md, err := sp.GetEntityDescriptor()
		if err != nil {
      w.WriteHeader(500)
      w.Write([]byte("Error: " + err.Error()))
			return
		}

		w.Header().Set("Content-Type", "application/xml")
		w.Write([]byte(md))
	})
}

Receiving a authnRequest

b64Request := r.URL.Query().Get("SAMLRequest")
if b64Request == "" {
  w.WriteHeader(400)
  w.Write([]byte("SAMLRequest parameter missing"))
  return
}

defated, err := base64.StdEncoding.DecodeString(b64Request)
if err != nil {
  w.WriteHeader(500)
  w.Write([]byte("Error: " + err.Error()))
  return
}

// enflate and unmarshal
var buffer bytes.Buffer
rdr := flate.NewReader(bytes.NewReader(defated))
io.Copy(&buffer, rdr)
var authnRequest saml.AuthnRequest

err = xml.Unmarshal(buffer.Bytes(), &authnRequest)
if err != nil {
  w.WriteHeader(500)
  w.Write([]byte("Error: " + err.Error()))
  return
}

if authnRequest.Issuer.Url != issuerURL {
  w.WriteHeader(500)
  w.Write([]byte("unauthorized issuer "+authnRequest.Issuer.Url))
  return
}

Creating a SAML Response (if acting as an IdP)

issuer := "http://localhost:8000/saml"
authnResponse := saml.NewSignedResponse()
authnResponse.Issuer.Url = issuer
authnResponse.Assertion.Issuer.Url = issuer
authnResponse.Signature.KeyInfo.X509Data.X509Certificate.Cert = stringValueOfCert
authnResponse.Assertion.Subject.NameID.Value = userIdThatYouAuthenticated
authnResponse.AddAttribute("uid", userIdThatYouAuthenticated)
authnResponse.AddAttribute("email", "someone@domain")
authnResponse.Assertion.Subject.SubjectConfirmation.SubjectConfirmationData.InResponseTo = authnRequestIdRespondingTo
authnResponse.InResponseTo = authnRequestIdRespondingTo
authnResponse.Assertion.Subject.SubjectConfirmation.SubjectConfirmationData.Recipient = issuer

// signed XML string
signed, err := authnResponse.SignedString("<private key>")

// or signed base64 encoded XML string
b64XML, err := authnResponse.EncodedSignedString("<private key>")

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