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build_logout_response.go
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package saml2
import (
"bytes"
"encoding/base64"
"html/template"
"github.com/beevik/etree"
"github.com/russellhaering/gosaml2/uuid"
)
func (sp *SAMLServiceProvider) buildLogoutResponse(statusCodeValue string, reqID string, includeSig bool) (*etree.Document, error) {
logoutResponse := &etree.Element{
Space: "samlp",
Tag: "LogoutResponse",
}
logoutResponse.CreateAttr("xmlns:samlp", "urn:oasis:names:tc:SAML:2.0:protocol")
logoutResponse.CreateAttr("xmlns:saml", "urn:oasis:names:tc:SAML:2.0:assertion")
arId := uuid.NewV4()
logoutResponse.CreateAttr("ID", "_"+arId.String())
logoutResponse.CreateAttr("Version", "2.0")
logoutResponse.CreateAttr("IssueInstant", sp.Clock.Now().UTC().Format(issueInstantFormat))
logoutResponse.CreateAttr("Destination", sp.IdentityProviderSLOURL)
logoutResponse.CreateAttr("InResponseTo", reqID)
// NOTE(russell_h): In earlier versions we mistakenly sent the IdentityProviderIssuer
// in the AuthnRequest. For backwards compatibility we will fall back to that
// behavior when ServiceProviderIssuer isn't set.
if sp.ServiceProviderIssuer != "" {
logoutResponse.CreateElement("saml:Issuer").SetText(sp.ServiceProviderIssuer)
} else {
logoutResponse.CreateElement("saml:Issuer").SetText(sp.IdentityProviderIssuer)
}
status := logoutResponse.CreateElement("samlp:Status")
statusCode := status.CreateElement("samlp:StatusCode")
statusCode.CreateAttr("Value", statusCodeValue)
doc := etree.NewDocument()
// Only POST binding includes <Signature> in <AuthnRequest> (includeSig)
if includeSig {
signed, err := sp.SignLogoutResponse(logoutResponse)
if err != nil {
return nil, err
}
doc.SetRoot(signed)
} else {
doc.SetRoot(logoutResponse)
}
return doc, nil
}
func (sp *SAMLServiceProvider) BuildLogoutResponseDocument(status string, reqID string) (*etree.Document, error) {
return sp.buildLogoutResponse(status, reqID, true)
}
func (sp *SAMLServiceProvider) BuildLogoutResponseDocumentNoSig(status string, reqID string) (*etree.Document, error) {
return sp.buildLogoutResponse(status, reqID, false)
}
func (sp *SAMLServiceProvider) SignLogoutResponse(el *etree.Element) (*etree.Element, error) {
ctx := sp.SigningContext()
sig, err := ctx.ConstructSignature(el, true)
if err != nil {
return nil, err
}
ret := el.Copy()
var children []etree.Token
children = append(children, ret.Child[0]) // issuer is always first
children = append(children, sig) // next is the signature
children = append(children, ret.Child[1:]...) // then all other children
ret.Child = children
return ret, nil
}
func (sp *SAMLServiceProvider) buildLogoutResponseBodyPostFromDocument(relayState string, doc *etree.Document) ([]byte, error) {
respBuf, err := doc.WriteToBytes()
if err != nil {
return nil, err
}
encodedRespBuf := base64.StdEncoding.EncodeToString(respBuf)
var tmpl *template.Template
var rv bytes.Buffer
if relayState != "" {
tmpl = template.Must(template.New("saml-post-form").Parse(`<html>` +
`<form method="post" action="{{.URL}}" id="SAMLResponseForm">` +
`<input type="hidden" name="SAMLResponse" value="{{.SAMLResponse}}" />` +
`<input type="hidden" name="RelayState" value="{{.RelayState}}" />` +
`<input id="SAMLSubmitButton" type="submit" value="Continue" />` +
`</form>` +
`<script>document.getElementById('SAMLSubmitButton').style.visibility='hidden';</script>` +
`<script>document.getElementById('SAMLResponseForm').submit();</script>` +
`</html>`))
data := struct {
URL string
SAMLResponse string
RelayState string
}{
URL: sp.IdentityProviderSLOURL,
SAMLResponse: encodedRespBuf,
RelayState: relayState,
}
if err = tmpl.Execute(&rv, data); err != nil {
return nil, err
}
} else {
tmpl = template.Must(template.New("saml-post-form").Parse(`<html>` +
`<form method="post" action="{{.URL}}" id="SAMLResponseForm">` +
`<input type="hidden" name="SAMLResponse" value="{{.SAMLResponse}}" />` +
`<input id="SAMLSubmitButton" type="submit" value="Continue" />` +
`</form>` +
`<script>document.getElementById('SAMLSubmitButton').style.visibility='hidden';</script>` +
`<script>document.getElementById('SAMLResponseForm').submit();</script>` +
`</html>`))
data := struct {
URL string
SAMLResponse string
}{
URL: sp.IdentityProviderSLOURL,
SAMLResponse: encodedRespBuf,
}
if err = tmpl.Execute(&rv, data); err != nil {
return nil, err
}
}
return rv.Bytes(), nil
}
func (sp *SAMLServiceProvider) BuildLogoutResponseBodyPostFromDocument(relayState string, doc *etree.Document) ([]byte, error) {
return sp.buildLogoutResponseBodyPostFromDocument(relayState, doc)
}