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saml.ts
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saml.ts
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import Debug from "debug";
const debug = Debug("passport-saml");
import * as zlib from "zlib";
import * as xml2js from "xml2js";
import * as xmlCrypto from "xml-crypto";
import * as crypto from "crypto";
import * as xmldom from "xmldom";
import * as url from "url";
import * as querystring from "querystring";
import * as xmlbuilder from "xmlbuilder";
import * as xmlenc from "xml-encryption";
import * as util from "util";
import { CacheProvider as InMemoryCacheProvider } from "./inmemory-cache-provider";
import * as algorithms from "./algorithms";
import { signAuthnRequestPost } from "./saml-post-signing";
import type { Request } from "express";
import { ParsedQs } from "qs";
import {
AudienceRestrictionXML,
AuthenticateOptions,
AuthorizeOptions,
AuthorizeRequestXML,
CertCallback,
LogoutRequestXML,
Profile,
RequestWithUser,
SamlOptions,
SamlIDPListConfig,
SamlIDPEntryConfig,
ServiceMetadataXML,
XMLInput,
XMLObject,
XMLOutput,
SamlConfig,
} from "./types";
import { assertRequired } from "./utility";
const inflateRawAsync = util.promisify(zlib.inflateRaw);
const deflateRawAsync = util.promisify(zlib.deflateRaw);
interface NameID {
value: string | null;
format: string | null;
}
async function processValidlySignedPostRequestAsync(
self: SAML,
doc: XMLOutput,
dom: Document
): Promise<{ profile?: Profile; loggedOut?: boolean }> {
const request = doc.LogoutRequest;
if (request) {
const profile = {} as Profile;
if (request.$.ID) {
profile.ID = request.$.ID;
} else {
throw new Error("Missing SAML LogoutRequest ID");
}
const issuer = request.Issuer;
if (issuer && issuer[0]._) {
profile.issuer = issuer[0]._;
} else {
throw new Error("Missing SAML issuer");
}
const nameID = await self.getNameIdAsync(self, dom);
if (nameID) {
profile.nameID = nameID.value!;
if (nameID.format) {
profile.nameIDFormat = nameID.format;
}
} else {
throw new Error("Missing SAML NameID");
}
const sessionIndex = request.SessionIndex;
if (sessionIndex) {
profile.sessionIndex = sessionIndex[0]._;
}
return { profile, loggedOut: true };
} else {
throw new Error("Unknown SAML request message");
}
}
async function processValidlySignedSamlLogoutAsync(
self: SAML,
doc: XMLOutput,
dom: Document
): Promise<{ profile?: Profile | null; loggedOut?: boolean }> {
const response = doc.LogoutResponse;
const request = doc.LogoutRequest;
if (response) {
return { profile: null, loggedOut: true };
} else if (request) {
return await processValidlySignedPostRequestAsync(self, doc, dom);
} else {
throw new Error("Unknown SAML response message");
}
}
async function promiseWithNameID(nameid: Node): Promise<NameID> {
const format = xmlCrypto.xpath(nameid, "@Format") as Node[];
return {
value: nameid.textContent,
format: format && format[0] && format[0].nodeValue,
};
}
class SAML {
private ctorOptions: SamlConfig;
// This will be fully defined upon first use
// This enables compatability with lazy usage from MultiSamlStrategy
options: SamlOptions = {} as SamlOptions;
// This is only for testing
cacheProvider!: InMemoryCacheProvider;
constructor(ctorOptions: SamlConfig) {
this.ctorOptions = ctorOptions;
Object.defineProperty(this, "options", {
get: function () {
// Check to make sure we have new options before we throw
// this will allow catch blocks to still probe this.options
// without generating a secondary error which obfuscates the
// initialization error
const options = this.initialize();
delete this.options;
delete this.cacheProvider;
this.options = options;
this.cacheProvider = this.options.cacheProvider;
return this.options;
},
configurable: true,
});
Object.defineProperty(this, "cacheProvider", {
get: function () {
const cacheProvider = this.options.cacheProvider;
return cacheProvider;
},
configurable: true,
});
}
initialize(): SamlOptions {
if (!this.ctorOptions) {
throw new Error("SamlOptions required on construction");
}
if (this.ctorOptions.privateCert) {
console.warn("options.privateCert has been deprecated; use options.privateKey instead.");
if (!this.ctorOptions.privateKey) {
this.ctorOptions.privateKey = this.ctorOptions.privateCert;
}
}
const options = {
...this.ctorOptions,
passive: this.ctorOptions.passive ?? false,
disableRequestedAuthnContext: this.ctorOptions.disableRequestedAuthnContext ?? false,
additionalParams: this.ctorOptions.additionalParams ?? {},
additionalAuthorizeParams: this.ctorOptions.additionalAuthorizeParams ?? {},
additionalLogoutParams: this.ctorOptions.additionalLogoutParams ?? {},
forceAuthn: this.ctorOptions.forceAuthn ?? false,
skipRequestCompression: this.ctorOptions.skipRequestCompression ?? false,
disableRequestAcsUrl: this.ctorOptions.disableRequestAcsUrl ?? false,
acceptedClockSkewMs: this.ctorOptions.acceptedClockSkewMs ?? 0,
path: this.ctorOptions.path ?? "/saml/consume",
host: this.ctorOptions.host ?? "localhost",
issuer: this.ctorOptions.issuer ?? "onelogin_saml",
identifierFormat:
this.ctorOptions.identifierFormat === undefined
? "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
: this.ctorOptions.identifierFormat,
authnContext: this.ctorOptions.authnContext ?? [
"urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport",
],
validateInResponseTo: this.ctorOptions.validateInResponseTo ?? false,
cert: assertRequired(this.ctorOptions.cert, "cert is required"),
requestIdExpirationPeriodMs: this.ctorOptions.requestIdExpirationPeriodMs ?? 28800000, // 8 hours
cacheProvider:
this.ctorOptions.cacheProvider ??
new InMemoryCacheProvider({
keyExpirationPeriodMs: this.ctorOptions.requestIdExpirationPeriodMs,
}),
logoutUrl: this.ctorOptions.logoutUrl ?? this.ctorOptions.entryPoint ?? "", // Default to Entry Point
signatureAlgorithm: this.ctorOptions.signatureAlgorithm ?? "sha1", // sha1, sha256, or sha512
authnRequestBinding: this.ctorOptions.authnRequestBinding ?? "HTTP-Redirect",
RacComparison: (() => {
/**
* List of possible values:
* - exact : Assertion context must exactly match a context in the list
* - minimum: Assertion context must be at least as strong as a context in the list
* - maximum: Assertion context must be no stronger than a context in the list
* - better: Assertion context must be stronger than all contexts in the list
*/
this.ctorOptions.RacComparison = this.ctorOptions.RacComparison ?? "exact";
if (
["exact", "minimum", "maximum", "better"].indexOf(this.ctorOptions.RacComparison) === -1
) {
throw new Error("RacComparison must be one of ['exact', 'minimum', 'maximum', 'better']");
}
return this.ctorOptions.RacComparison;
})(),
};
return options;
}
getProtocol(req: Request | { headers?: undefined; protocol?: undefined }) {
return this.options.protocol || (req.protocol || "http").concat("://");
}
getCallbackUrl(req: Request | { headers?: undefined; protocol?: undefined }) {
// Post-auth destination
if (this.options.callbackUrl) {
return this.options.callbackUrl;
} else {
let host;
if (req.headers) {
host = req.headers.host;
} else {
host = this.options.host;
}
return this.getProtocol(req) + host + this.options.path;
}
}
generateUniqueID() {
return crypto.randomBytes(10).toString("hex");
}
generateInstant() {
return new Date().toISOString();
}
signRequest(samlMessage: querystring.ParsedUrlQueryInput): void {
this.options.privateKey = assertRequired(this.options.privateKey, "privateKey is required");
const samlMessageToSign: querystring.ParsedUrlQueryInput = {};
samlMessage.SigAlg = algorithms.getSigningAlgorithm(this.options.signatureAlgorithm);
const signer = algorithms.getSigner(this.options.signatureAlgorithm);
if (samlMessage.SAMLRequest) {
samlMessageToSign.SAMLRequest = samlMessage.SAMLRequest;
}
if (samlMessage.SAMLResponse) {
samlMessageToSign.SAMLResponse = samlMessage.SAMLResponse;
}
if (samlMessage.RelayState) {
samlMessageToSign.RelayState = samlMessage.RelayState;
}
if (samlMessage.SigAlg) {
samlMessageToSign.SigAlg = samlMessage.SigAlg;
}
signer.update(querystring.stringify(samlMessageToSign));
samlMessage.Signature = signer.sign(this.keyToPEM(this.options.privateKey), "base64");
}
async generateAuthorizeRequestAsync(
req: Request,
isPassive: boolean,
isHttpPostBinding: boolean
): Promise<string | undefined> {
this.options.entryPoint = assertRequired(this.options.entryPoint, "entryPoint is required");
const id = "_" + this.generateUniqueID();
const instant = this.generateInstant();
if (this.options.validateInResponseTo) {
await this.cacheProvider.saveAsync(id, instant);
}
const request: AuthorizeRequestXML = {
"samlp:AuthnRequest": {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@ID": id,
"@Version": "2.0",
"@IssueInstant": instant,
"@ProtocolBinding": "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST",
"@Destination": this.options.entryPoint,
"saml:Issuer": {
"@xmlns:saml": "urn:oasis:names:tc:SAML:2.0:assertion",
"#text": this.options.issuer,
},
},
};
if (isPassive) request["samlp:AuthnRequest"]["@IsPassive"] = true;
if (this.options.forceAuthn) {
request["samlp:AuthnRequest"]["@ForceAuthn"] = true;
}
if (!this.options.disableRequestAcsUrl) {
request["samlp:AuthnRequest"]["@AssertionConsumerServiceURL"] = this.getCallbackUrl(req);
}
if (this.options.identifierFormat) {
request["samlp:AuthnRequest"]["samlp:NameIDPolicy"] = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@Format": this.options.identifierFormat,
"@AllowCreate": "true",
};
}
if (!this.options.disableRequestedAuthnContext) {
const authnContextClassRefs: XMLInput[] = [];
(this.options.authnContext as string[]).forEach(function (value) {
authnContextClassRefs.push({
"@xmlns:saml": "urn:oasis:names:tc:SAML:2.0:assertion",
"#text": value,
});
});
request["samlp:AuthnRequest"]["samlp:RequestedAuthnContext"] = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@Comparison": this.options.RacComparison,
"saml:AuthnContextClassRef": authnContextClassRefs,
};
}
if (this.options.attributeConsumingServiceIndex != null) {
request["samlp:AuthnRequest"][
"@AttributeConsumingServiceIndex"
] = this.options.attributeConsumingServiceIndex;
}
if (this.options.providerName != null) {
request["samlp:AuthnRequest"]["@ProviderName"] = this.options.providerName;
}
if (this.options.scoping != null) {
const scoping: XMLInput = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
};
if (typeof this.options.scoping.proxyCount === "number") {
scoping["@ProxyCount"] = this.options.scoping.proxyCount;
}
if (this.options.scoping.idpList) {
scoping["samlp:IDPList"] = this.options.scoping.idpList.map(
(idpListItem: SamlIDPListConfig) => {
const formattedIdpListItem: XMLInput = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
};
if (idpListItem.entries) {
formattedIdpListItem["samlp:IDPEntry"] = idpListItem.entries.map(
(entry: SamlIDPEntryConfig) => {
const formattedEntry: XMLInput = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
};
formattedEntry["@ProviderID"] = entry.providerId;
if (entry.name) {
formattedEntry["@Name"] = entry.name;
}
if (entry.loc) {
formattedEntry["@Loc"] = entry.loc;
}
return formattedEntry;
}
);
}
if (idpListItem.getComplete) {
formattedIdpListItem["samlp:GetComplete"] = idpListItem.getComplete;
}
return formattedIdpListItem;
}
);
}
if (this.options.scoping.requesterId) {
scoping["samlp:RequesterID"] = this.options.scoping.requesterId;
}
request["samlp:AuthnRequest"]["samlp:Scoping"] = scoping;
}
let stringRequest = xmlbuilder.create((request as unknown) as Record<string, any>).end();
if (isHttpPostBinding && this.options.privateKey != null) {
stringRequest = signAuthnRequestPost(stringRequest, this.options);
}
return stringRequest;
}
async generateLogoutRequest(req: RequestWithUser) {
const id = "_" + this.generateUniqueID();
const instant = this.generateInstant();
const request = {
"samlp:LogoutRequest": {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@xmlns:saml": "urn:oasis:names:tc:SAML:2.0:assertion",
"@ID": id,
"@Version": "2.0",
"@IssueInstant": instant,
"@Destination": this.options.logoutUrl,
"saml:Issuer": {
"@xmlns:saml": "urn:oasis:names:tc:SAML:2.0:assertion",
"#text": this.options.issuer,
},
"saml:NameID": {
"@Format": req.user!.nameIDFormat,
"#text": req.user!.nameID,
},
},
} as LogoutRequestXML;
if (req.user!.nameQualifier != null) {
request["samlp:LogoutRequest"]["saml:NameID"]["@NameQualifier"] = req.user!.nameQualifier;
}
if (req.user!.spNameQualifier != null) {
request["samlp:LogoutRequest"]["saml:NameID"]["@SPNameQualifier"] = req.user!.spNameQualifier;
}
if (req.user!.sessionIndex) {
request["samlp:LogoutRequest"]["saml2p:SessionIndex"] = {
"@xmlns:saml2p": "urn:oasis:names:tc:SAML:2.0:protocol",
"#text": req.user!.sessionIndex,
};
}
await this.cacheProvider.saveAsync(id, instant);
return xmlbuilder.create((request as unknown) as Record<string, any>).end();
}
generateLogoutResponse(req: Request, logoutRequest: Profile) {
const id = "_" + this.generateUniqueID();
const instant = this.generateInstant();
const request = {
"samlp:LogoutResponse": {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@xmlns:saml": "urn:oasis:names:tc:SAML:2.0:assertion",
"@ID": id,
"@Version": "2.0",
"@IssueInstant": instant,
"@Destination": this.options.logoutUrl,
"@InResponseTo": logoutRequest.ID,
"saml:Issuer": {
"#text": this.options.issuer,
},
"samlp:Status": {
"samlp:StatusCode": {
"@Value": "urn:oasis:names:tc:SAML:2.0:status:Success",
},
},
},
};
return xmlbuilder.create(request).end();
}
async requestToUrlAsync(
request: string | null | undefined,
response: string | null,
operation: string,
additionalParameters: querystring.ParsedUrlQuery
): Promise<string> {
this.options.entryPoint = assertRequired(this.options.entryPoint, "entryPoint is required");
let buffer: Buffer;
if (this.options.skipRequestCompression) {
buffer = Buffer.from((request || response)!, "utf8");
} else {
buffer = await deflateRawAsync((request || response)!);
}
const base64 = buffer.toString("base64");
let target = url.parse(this.options.entryPoint, true);
if (operation === "logout") {
if (this.options.logoutUrl) {
target = url.parse(this.options.logoutUrl, true);
}
} else if (operation !== "authorize") {
throw new Error("Unknown operation: " + operation);
}
const samlMessage: querystring.ParsedUrlQuery = request
? {
SAMLRequest: base64,
}
: {
SAMLResponse: base64,
};
Object.keys(additionalParameters).forEach((k) => {
samlMessage[k] = additionalParameters[k];
});
if (this.options.privateKey != null) {
if (!this.options.entryPoint) {
throw new Error('"entryPoint" config parameter is required for signed messages');
}
// sets .SigAlg and .Signature
this.signRequest(samlMessage);
}
Object.keys(samlMessage).forEach((k) => {
target.query[k] = samlMessage[k];
});
// Delete 'search' to for pulling query string from 'query'
// https://nodejs.org/api/url.html#url_url_format_urlobj
target.search = null;
return url.format(target);
}
getAdditionalParams(
req: Request,
operation: string,
overrideParams?: querystring.ParsedUrlQuery
): querystring.ParsedUrlQuery {
const additionalParams: querystring.ParsedUrlQuery = {};
const RelayState = (req.query && req.query.RelayState) || (req.body && req.body.RelayState);
if (RelayState) {
additionalParams.RelayState = RelayState;
}
const optionsAdditionalParams = this.options.additionalParams;
Object.keys(optionsAdditionalParams).forEach(function (k) {
additionalParams[k] = optionsAdditionalParams[k];
});
let optionsAdditionalParamsForThisOperation: Record<string, string> = {};
if (operation == "authorize") {
optionsAdditionalParamsForThisOperation = this.options.additionalAuthorizeParams;
}
if (operation == "logout") {
optionsAdditionalParamsForThisOperation = this.options.additionalLogoutParams;
}
Object.keys(optionsAdditionalParamsForThisOperation).forEach(function (k) {
additionalParams[k] = optionsAdditionalParamsForThisOperation[k];
});
overrideParams = overrideParams ?? {};
Object.keys(overrideParams).forEach(function (k) {
additionalParams[k] = overrideParams![k];
});
return additionalParams;
}
async getAuthorizeUrlAsync(req: Request, options: AuthorizeOptions): Promise<string> {
const request = await this.generateAuthorizeRequestAsync(req, this.options.passive, false);
const operation = "authorize";
const overrideParams = options ? options.additionalParams || {} : {};
return await this.requestToUrlAsync(
request,
null,
operation,
this.getAdditionalParams(req, operation, overrideParams)
);
}
async getAuthorizeFormAsync(req: Request): Promise<string> {
this.options.entryPoint = assertRequired(this.options.entryPoint, "entryPoint is required");
// The quoteattr() function is used in a context, where the result will not be evaluated by javascript
// but must be interpreted by an XML or HTML parser, and it must absolutely avoid breaking the syntax
// of an element attribute.
const quoteattr = function (
s:
| string
| number
| boolean
| undefined
| null
| readonly string[]
| readonly number[]
| readonly boolean[],
preserveCR?: boolean
) {
const preserveCRChar = preserveCR ? " " : "\n";
return (
("" + s) // Forces the conversion to string.
.replace(/&/g, "&") // This MUST be the 1st replacement.
.replace(/'/g, "'") // The 4 other predefined entities, required.
.replace(/"/g, """)
.replace(/</g, "<")
.replace(/>/g, ">")
// Add other replacements here for HTML only
// Or for XML, only if the named entities are defined in its DTD.
.replace(/\r\n/g, preserveCRChar) // Must be before the next replacement.
.replace(/[\r\n]/g, preserveCRChar)
);
};
const request = await this.generateAuthorizeRequestAsync(req, this.options.passive, true);
let buffer: Buffer;
if (this.options.skipRequestCompression) {
buffer = Buffer.from(request!, "utf8");
} else {
buffer = await deflateRawAsync(request!);
}
const operation = "authorize";
const additionalParameters = this.getAdditionalParams(req, operation);
const samlMessage: querystring.ParsedUrlQueryInput = {
SAMLRequest: buffer!.toString("base64"),
};
Object.keys(additionalParameters).forEach((k) => {
samlMessage[k] = additionalParameters[k] || "";
});
const formInputs = Object.keys(samlMessage)
.map((k) => {
return '<input type="hidden" name="' + k + '" value="' + quoteattr(samlMessage[k]) + '" />';
})
.join("\r\n");
return [
"<!DOCTYPE html>",
"<html>",
"<head>",
'<meta charset="utf-8">',
'<meta http-equiv="x-ua-compatible" content="ie=edge">',
"</head>",
'<body onload="document.forms[0].submit()">',
"<noscript>",
"<p><strong>Note:</strong> Since your browser does not support JavaScript, you must press the button below once to proceed.</p>",
"</noscript>",
'<form method="post" action="' + encodeURI(this.options.entryPoint) + '">',
formInputs,
'<input type="submit" value="Submit" />',
"</form>",
'<script>document.forms[0].style.display="none";</script>', // Hide the form if JavaScript is enabled
"</body>",
"</html>",
].join("\r\n");
}
async getLogoutUrlAsync(req: RequestWithUser, options: AuthenticateOptions & AuthorizeOptions) {
const request = await this.generateLogoutRequest(req);
const operation = "logout";
const overrideParams = options ? options.additionalParams || {} : {};
return await this.requestToUrlAsync(
request,
null,
operation,
this.getAdditionalParams(req, operation, overrideParams)
);
}
getLogoutResponseUrl(
req: RequestWithUser,
options: AuthenticateOptions & AuthorizeOptions,
callback: (err: Error | null, url?: string | null) => void
): void {
util.callbackify(() => this.getLogoutResponseUrlAsync(req, options))(callback);
}
async getLogoutResponseUrlAsync(
req: RequestWithUser,
options: AuthenticateOptions & AuthorizeOptions
): Promise<string> {
const response = this.generateLogoutResponse(req, req.samlLogoutRequest);
const operation = "logout";
const overrideParams = options ? options.additionalParams || {} : {};
return await this.requestToUrlAsync(
null,
response,
operation,
this.getAdditionalParams(req, operation, overrideParams)
);
}
certToPEM(cert: string): string {
cert = cert.match(/.{1,64}/g)!.join("\n");
if (cert.indexOf("-BEGIN CERTIFICATE-") === -1) cert = "-----BEGIN CERTIFICATE-----\n" + cert;
if (cert.indexOf("-END CERTIFICATE-") === -1) cert = cert + "\n-----END CERTIFICATE-----\n";
return cert;
}
async certsToCheck(): Promise<string[]> {
let checkedCerts: string[];
if (typeof this.options.cert === "function") {
checkedCerts = await util
.promisify(this.options.cert as CertCallback)()
.then((certs) => {
certs = assertRequired(certs, "callback didn't return cert");
if (!Array.isArray(certs)) {
certs = [certs];
}
return certs;
});
} else if (Array.isArray(this.options.cert)) {
checkedCerts = this.options.cert;
} else {
checkedCerts = [this.options.cert];
}
checkedCerts.forEach((cert) => {
assertRequired(cert, "unknown cert found");
});
return checkedCerts;
}
// This function checks that the |currentNode| in the |fullXml| document contains exactly 1 valid
// signature of the |currentNode|.
//
// See https://github.com/bergie/passport-saml/issues/19 for references to some of the attack
// vectors against SAML signature verification.
validateSignature(fullXml: string, currentNode: HTMLElement, certs: string[]) {
const xpathSigQuery =
".//*[" +
"local-name(.)='Signature' and " +
"namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#' and " +
"descendant::*[local-name(.)='Reference' and @URI='#" +
currentNode.getAttribute("ID") +
"']" +
"]";
const signatures = xmlCrypto.xpath(currentNode, xpathSigQuery);
// This function is expecting to validate exactly one signature, so if we find more or fewer
// than that, reject.
if (signatures.length != 1) {
return false;
}
const signature = signatures[0];
return certs.some((certToCheck) => {
return this.validateSignatureForCert(signature as string, certToCheck, fullXml, currentNode);
});
}
// This function checks that the |signature| is signed with a given |cert|.
validateSignatureForCert(
signature: string | Node,
cert: string,
fullXml: string,
currentNode: HTMLElement
) {
const sig = new xmlCrypto.SignedXml();
sig.keyInfoProvider = {
file: "",
getKeyInfo: (key) => "<X509Data></X509Data>",
getKey: (keyInfo) => Buffer.from(this.certToPEM(cert)),
};
signature = this.normalizeNewlines(signature.toString());
sig.loadSignature(signature);
// We expect each signature to contain exactly one reference to the top level of the xml we
// are validating, so if we see anything else, reject.
if (sig.references.length != 1) return false;
const refUri = sig.references[0].uri!;
const refId = refUri[0] === "#" ? refUri.substring(1) : refUri;
// If we can't find the reference at the top level, reject
const idAttribute = currentNode.getAttribute("ID") ? "ID" : "Id";
if (currentNode.getAttribute(idAttribute) != refId) return false;
// If we find any extra referenced nodes, reject. (xml-crypto only verifies one digest, so
// multiple candidate references is bad news)
const totalReferencedNodes = xmlCrypto.xpath(
currentNode.ownerDocument,
"//*[@" + idAttribute + "='" + refId + "']"
);
if (totalReferencedNodes.length > 1) {
return false;
}
fullXml = this.normalizeNewlines(fullXml);
return sig.checkSignature(fullXml);
}
async validatePostResponseAsync(
container: Record<string, string>
): Promise<{ profile?: Profile | null; loggedOut?: boolean }> {
let xml: string, doc: Document, inResponseTo: string | null;
try {
xml = Buffer.from(container.SAMLResponse, "base64").toString("utf8");
doc = new xmldom.DOMParser({}).parseFromString(xml);
if (!Object.prototype.hasOwnProperty.call(doc, "documentElement"))
throw new Error("SAMLResponse is not valid base64-encoded XML");
const inResponseToNodes = xmlCrypto.xpath(
doc,
"/*[local-name()='Response']/@InResponseTo"
) as Attr[];
if (inResponseToNodes) {
inResponseTo = inResponseToNodes.length ? inResponseToNodes[0].nodeValue : null;
await this.validateInResponseTo(inResponseTo);
}
const certs = await this.certsToCheck();
// Check if this document has a valid top-level signature
let validSignature = false;
if (this.validateSignature(xml, doc.documentElement, certs)) {
validSignature = true;
}
const assertions = xmlCrypto.xpath(
doc,
"/*[local-name()='Response']/*[local-name()='Assertion']"
) as HTMLElement[];
const encryptedAssertions = xmlCrypto.xpath(
doc,
"/*[local-name()='Response']/*[local-name()='EncryptedAssertion']"
);
if (assertions.length + encryptedAssertions.length > 1) {
// There's no reason I know of that we want to handle multiple assertions, and it seems like a
// potential risk vector for signature scope issues, so treat this as an invalid signature
throw new Error("Invalid signature: multiple assertions");
}
if (assertions.length == 1) {
if (!validSignature && !this.validateSignature(xml, assertions[0], certs)) {
throw new Error("Invalid signature");
}
return this.processValidlySignedAssertionAsync(
assertions[0].toString(),
xml,
inResponseTo!
);
}
if (encryptedAssertions.length == 1) {
this.options.decryptionPvk = assertRequired(
this.options.decryptionPvk,
"No decryption key for encrypted SAML response"
);
const encryptedAssertionXml = encryptedAssertions[0].toString();
const xmlencOptions = { key: this.options.decryptionPvk };
const decryptedXml: string = await util.promisify(xmlenc.decrypt).bind(xmlenc)(
encryptedAssertionXml,
xmlencOptions
);
const decryptedDoc = new xmldom.DOMParser().parseFromString(decryptedXml);
const decryptedAssertions = xmlCrypto.xpath(
decryptedDoc,
"/*[local-name()='Assertion']"
) as HTMLElement[];
if (decryptedAssertions.length != 1) throw new Error("Invalid EncryptedAssertion content");
if (
!validSignature &&
!this.validateSignature(decryptedXml, decryptedAssertions[0], certs)
) {
throw new Error("Invalid signature from encrypted assertion");
}
return await this.processValidlySignedAssertionAsync(
decryptedAssertions[0].toString(),
xml,
inResponseTo!
);
}
// If there's no assertion, fall back on xml2js response parsing for the status &
// LogoutResponse code.
const parserConfig = {
explicitRoot: true,
explicitCharkey: true,
tagNameProcessors: [xml2js.processors.stripPrefix],
};
const parser = new xml2js.Parser(parserConfig);
const xmljsDoc = await parser.parseStringPromise(xml);
const response = xmljsDoc.Response;
if (response) {
const assertion = response.Assertion;
if (!assertion) {
const status = response.Status;
if (status) {
const statusCode = status[0].StatusCode;
if (
statusCode &&
statusCode[0].$.Value === "urn:oasis:names:tc:SAML:2.0:status:Responder"
) {
const nestedStatusCode = statusCode[0].StatusCode;
if (
nestedStatusCode &&
nestedStatusCode[0].$.Value === "urn:oasis:names:tc:SAML:2.0:status:NoPassive"
) {
if (!validSignature) {
throw new Error("Invalid signature: NoPassive");
}
return { profile: null, loggedOut: false };
}
}
// Note that we're not requiring a valid signature before this logic -- since we are
// throwing an error in any case, and some providers don't sign error results,
// let's go ahead and give the potentially more helpful error.
if (statusCode && statusCode[0].$.Value) {
const msgType = statusCode[0].$.Value.match(/[^:]*$/)[0];
if (msgType != "Success") {
let msg = "unspecified";
if (status[0].StatusMessage) {
msg = status[0].StatusMessage[0]._;
} else if (statusCode[0].StatusCode) {
msg = statusCode[0].StatusCode[0].$.Value.match(/[^:]*$/)[0];
}
const error = new Error("SAML provider returned " + msgType + " error: " + msg);
const builderOpts = {
rootName: "Status",
headless: true,
};
// @ts-expect-error adding extra attr to default Error object
error.statusXml = new xml2js.Builder(builderOpts).buildObject(status[0]);
throw error;
}
}
}
}
throw new Error("Missing SAML assertion");
} else {
if (!validSignature) {
throw new Error("Invalid signature: No response found");
}
const logoutResponse = xmljsDoc.LogoutResponse;
if (logoutResponse) {
return { profile: null, loggedOut: true };
} else {
throw new Error("Unknown SAML response message");
}
}
} catch (err) {
debug("validatePostResponse resulted in an error: %s", err);
if (this.options.validateInResponseTo != null) {
await this.cacheProvider.removeAsync(inResponseTo!);
}
throw err;
}
}
async validateInResponseTo(inResponseTo: string | null): Promise<undefined> {
if (this.options.validateInResponseTo) {
if (inResponseTo) {
const result = await this.cacheProvider.getAsync(inResponseTo);
if (!result) throw new Error("InResponseTo is not valid");
return;
} else {
throw new Error("InResponseTo is missing from response");
}
} else {
return;
}
}
async validateRedirectAsync(
container: ParsedQs,
originalQuery: string | null
): Promise<{ profile?: Profile | null; loggedOut?: boolean }> {
const samlMessageType = container.SAMLRequest ? "SAMLRequest" : "SAMLResponse";
const data = Buffer.from(container[samlMessageType] as string, "base64");
const inflated = await inflateRawAsync(data);
const dom = new xmldom.DOMParser().parseFromString(inflated.toString());
const parserConfig = {
explicitRoot: true,
explicitCharkey: true,
tagNameProcessors: [xml2js.processors.stripPrefix],
};
const parser = new xml2js.Parser(parserConfig);
const doc: XMLOutput = await parser.parseStringPromise(inflated);
samlMessageType === "SAMLResponse"
? await this.verifyLogoutResponse(doc)
: this.verifyLogoutRequest(doc);
await this.hasValidSignatureForRedirect(container, originalQuery);
return await processValidlySignedSamlLogoutAsync(this, doc, dom);
}
async hasValidSignatureForRedirect(
container: ParsedQs,
originalQuery: string | null
): Promise<boolean | void> {
const tokens = originalQuery!.split("&");
const getParam = (key: string) => {
const exists = tokens.filter((t) => {
return new RegExp(key).test(t);
});
return exists[0];
};
if (container.Signature) {
let urlString = getParam("SAMLRequest") || getParam("SAMLResponse");