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redirect.go
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redirect.go
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// Copyright © 2017 Aaron Donovan <amdonov@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sp
import (
"bytes"
"compress/flate"
"encoding/base64"
"net/url"
"time"
"github.com/amdonov/lite-idp/saml"
"github.com/google/uuid"
)
// GetRedirect stores the provided state and returns a URL suitable for redirecting the SAML IdP (redirect binding)
func (sp *serviceProvider) GetRedirect(state []byte) (string, error) {
data := struct {
ID string
Time string
IDP string
ACSURL string
EntityID string
}{
saml.NewID(),
time.Now().UTC().Format(time.RFC3339),
sp.configuration.IDPRedirectEndpoint,
sp.configuration.AssertionConsumerServiceURL,
sp.configuration.EntityID,
}
var b bytes.Buffer
writer, err := flate.NewWriter(&b, flate.DefaultCompression)
if err != nil {
return "", err
}
err = sp.requestTemplate.Execute(writer, data)
if err != nil {
return "", err
}
err = writer.Flush()
if err != nil {
return "", err
}
// Don't need to encode this - is OK
stateID := uuid.New().String()
if sp.stateCache == nil {
// Caller doesn't want state managed by the SP
// Directly pass along the state provided
stateID = url.QueryEscape(string(state))
} else {
// Store the provided state
sp.stateCache.Set(stateID, state)
}
samlRequest := url.QueryEscape(base64.StdEncoding.EncodeToString(b.Bytes()))
requestToSign := "SAMLRequest=" + samlRequest + "&RelayState=" + stateID + "&SigAlg=" + url.QueryEscape(sp.signer.Algorithm())
signature, err := sp.signer.Sign([]byte(requestToSign))
if err != nil {
return "", err
}
query := requestToSign + "&Signature=" + url.QueryEscape(signature)
return sp.configuration.IDPRedirectEndpoint + "?" + query, err
}
const requestTemplate = `<?xml version="1.0"?><samlp:AuthnRequest ID="{{ .ID }}" Version="2.0" IssueInstant="{{ .Time }}" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Artifact" AssertionConsumerServiceURL="{{ .ACSURL }}" Destination="{{ .IDP }}" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"><saml:Issuer>{{ .EntityID }}</saml:Issuer></samlp:AuthnRequest>`