¶ Introduction of SAML2

Update Time: 2024-10-10 07:28:40

Security Assertion Markup Language (SAML) is an XML based open standard. It's allows identity providers (IdP) to pass authorization credentials to service providers (SP). SAML 2.0 enables Cross Domain Single Sign On (CDSSO), which means users can log in once, and those login credentials can be reused to log into other service providers.

¶ What is SAML

In SAML Protocol there are Identity Provider (IdP) and Service Provider (SP)

Identity Provider (IdP). Authing as an IdP, we send SAML Assertion to Service Provider (SP). SAML Assertion is XML based Token. It can be used to identify the user. There are other IdP like: Okta, SSOCircle, Auth0.

Service Provide (SP) is an individual or entity that provides services to another party. Like: Alibaba Cloud, Tencent Cloud, and AWS.

Identity Provider and Service Provider commute through users browser. The SP sends an HTTP redirect message to the IdP containing an authentication request. The IdP returns a SAML response with an assertion to the SP via HTTP POST. SP verify the SAML assertion and grant access to resource.

¶ SAML Request

When user verification is required, SP sent SAML Request via browser to IdP to verify the user.

Sample SAML Request from Alibaba Cloud:

GET https://core.authing.cn/v2/api/saml-idp/5e10927e4ecfd464fb4edaf6?SAMLRequest=fZJLT%2BMwFIX3%2FIrI%2B7yct9Wk6kyFQGJERQKL2RnnJnWV2Blfp2L%2BPaGlDLOApaV7vnN0jlfrl3FwjmBQalWS0AuIA0roVqq%2BJI%2FNtZuTdXW1Qj4OdGKb2e7VA%2FyZAa2zQQRjF91PrXAewdRgjlLA48NdSfbWTsh8H2WvpPL4IP%2FOyhN69N9Qfl3fE2e7UKTi9mR9EQhtwOOLz5LAE8o%2FUp9P8qRyZTv5CYRBQTOIQXRtnMbdcwwt71LiXGsj4JSwJB0fEIhzuy0Jp9AXgvaHgwzzPA%2FjfXagbRYlebeP%2BmI5wh1HlEf4J0Oc4Vah5cqWhAY0cIPCpXkTRiwoWJJ5eZH%2BJs7OaKuFHn5IdS5sNoppjhKZ4iMgs4LVm193jHoBez4fIbtpmp27u68b4jxdiqdvxS9TKGTnqr9nTe%2FGpDovw06JzWfC9wB%2B2Y5UXy8VRlmcpkWUpUlGY5p8TLfyP7tW78%2F%2Fv0f1Cg%3D%3D

Request sent to IdP in URL query string:

fZJLT+MwFIX3/IrI+7yct9Wk6kyFQGJERQKL2RnnJnWV2Blfp2L+PaGlDLOApaV7vnN0jlfrl3FwjmBQalWS0AuIA0roVqq+JI/NtZuTdXW1Qj4OdGKb2e7VA/yZAa2zQQRjF91PrXAewdRgjlLA48NdSfbWTsh8H2WvpPL4IP/OyhN69N9Qfl3fE2e7UKTi9mR9EQhtwOOLz5LAE8o/Up9P8qRyZTv5CYRBQTOIQXRtnMbdcwwt71LiXGsj4JSwJB0fEIhzuy0Jp9AXgvaHgwzzPA/jfXagbRYlebeP+mI5wh1HlEf4J0Oc4Vah5cqWhAY0cIPCpXkTRiwoWJJ5eZH+Js7OaKuFHn5IdS5sNoppjhKZ4iMgs4LVm193jHoBez4fIbtpmp27u68b4jxdiqdvxS9TKGTnqr9nTe/GpDovw06JzWfC9wB+2Y5UXy8VRlmcpkWUpUlGY5p8TLfyP7tW78//v0f1Cg==

After base64 decode and inflate decrypt (opens new window):

<?xml version="1.0" encoding="UTF-8"?>
<saml2p:AuthnRequest AssertionConsumerServiceURL="https://signin.aliyun.com/saml/SSO" Destination="https://core.authing.cn/v2/api/saml-idp/5e10927e4ecfd464fb4edaf6" ForceAuthn="false" ID="a2eg9c2gjji188814h7j2d7358fh3g9" IsPassive="false" IssueInstant="2020-09-28T13:09:57.896Z" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Version="2.0"
	xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol">
	<saml2:Issuer
		xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">https://signin.aliyun.com/1374669376572425/saml/SSO
	</saml2:Issuer>
</saml2p:AuthnRequest>

¶ SAML Response

IdP request user login once receive SAML Request from SP:

Img

After Login success, IdP return SAML assertion to SP (via HTTP POST):

<form id="saml-form" method="post" action="https://signin.aliyun.com/saml/SSO" autocomplete="off">
  <input
    type="hidden"
    name="SAMLResponse"
    id="saml-response"
    value="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"
  />
  <input
    type="hidden"
    name="RelayState"
    id="relay-state"
    value=""
  />
</form>
<script type="text/javascript">
  (function() {
    document.forms[0].submit();
  })();
</script>

SAML assertion contain HTML form and JavaScript code to submit form:

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

After base64 decode and inflate decrypt (opens new window):

<samlp:Response
	xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
	xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_62b177c1-a919-42f6-9586-47f13b71081f" Version="2.0" IssueInstant="2020-09-28T13:30:31.788Z" Destination="https://signin.aliyun.com/saml/SSO" InResponseTo="a49f8edi31cj0a2a459g0331c3d9c10">
	<saml:Issuer>https://20nqulvoqpbp.authing.cn</saml:Issuer>
	<samlp:Status>
		<samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
	</samlp:Status>
	<saml:Assertion
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:xs="http://www.w3.org/2001/XMLSchema"
		xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_fae95b47-cbf3-4a20-add0-99d856b4124e" Version="2.0" IssueInstant="2020-09-28T13:30:31.788Z">
		<saml:Issuer>https://20nqulvoqpbp.authing.cn</saml:Issuer>
		<ds:Signature
			xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
			<ds:SignedInfo>
				<ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
				<ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
				<ds:Reference URI="#_fae95b47-cbf3-4a20-add0-99d856b4124e">
					<ds:Transforms>
						<ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
						<ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
					</ds:Transforms>
					<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
					<ds:DigestValue>/ol6lC1j+smdonl48+lJTzUeqnw=</ds:DigestValue>
				</ds:Reference>
			</ds:SignedInfo>
			<ds:SignatureValue>awzcE0dp8BzTW4b4PFaRX7NKOC95bLqOnPeAKI/CsDfGaJdmzCK0fVliz+e6XzBluKfBpQtrQonKl7k2vVNaPFx9PpSVzwK91HLGvYQ0qB36uA4HFvm/3M31DL3ZRFPRq68ZaVAG6lMVd0YbiInVv9FWwsi+6jEpF+PRlmkoqAI=</ds:SignatureValue>
			<ds:KeyInfo>
				<ds:X509Data>
					<ds:X509Certificate>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</ds:X509Certificate>
				</ds:X509Data>
			</ds:KeyInfo>
		</ds:Signature>
		<saml:Subject>
			<saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">yezuwei@authing.onaliyun.com</saml:NameID>
			<saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
				<saml:SubjectConfirmationData NotOnOrAfter="2020-09-28T14:30:31.788Z" Recipient="https://signin.aliyun.com/saml/SSO" InResponseTo="a49f8edi31cj0a2a459g0331c3d9c10"/>
			</saml:SubjectConfirmation>
		</saml:Subject>
		<saml:Conditions NotBefore="2020-09-28T13:30:31.788Z" NotOnOrAfter="2020-09-28T14:30:31.788Z">
			<saml:AudienceRestriction>
				<saml:Audience>https://signin.aliyun.com/1374669376572425/saml/SSO</saml:Audience>
			</saml:AudienceRestriction>
		</saml:Conditions>
		<saml:AuthnStatement AuthnInstant="2020-09-28T13:30:31.888Z" SessionIndex="ooeumcq6eHjddr1H3Fyzou7Cs-OGTsNl">
			<saml:AuthnContext>
				<saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:unspecified</saml:AuthnContextClassRef>
			</saml:AuthnContext>
		</saml:AuthnStatement>
		<saml:AttributeStatement>
			<saml:Attribute Name="email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">
				<saml:AttributeValue
					xmlns:xs="http://www.w3.org/2001/XMLSchema"
					xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">yezuwei@authing.cn
				</saml:AttributeValue>
			</saml:Attribute>
			<saml:Attribute Name="name" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">
				<saml:AttributeValue
					xmlns:xs="http://www.w3.org/2001/XMLSchema"
					xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"/>
				</saml:Attribute>
				<saml:Attribute Name="username" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">
					<saml:AttributeValue
						xmlns:xs="http://www.w3.org/2001/XMLSchema"
						xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">yezuwei@authing.cn
					</saml:AttributeValue>
				</saml:Attribute>
				<saml:Attribute Name="phone" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic">
					<saml:AttributeValue
						xmlns:xs="http://www.w3.org/2001/XMLSchema"
						xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">null
					</saml:AttributeValue>
				</saml:Attribute>
			</saml:AttributeStatement>
		</saml:Assertion>
	</samlp:Response>

The Code above are users SAML assertion. Also be referred to users Token in XML format.

SP, IdP and XML Token may overwhelm you. Don't worry, Authing will do the most part. Just setup Authing IdP and you are ready to talk with SP.

Prev: OIDC FAQ Next: SAML2 Process