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saml.ts
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saml.ts
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import Debug from "debug";
const debug = Debug("node-saml");
import * as zlib from "zlib";
import * as crypto from "crypto";
import { URL } from "url";
import * as querystring from "querystring";
import * as util from "util";
import { InMemoryCacheProvider } from "./in-memory-cache-provider";
import * as algorithms from "./algorithms";
import { ParsedQs } from "qs";
import {
isValidSamlSigningOptions,
AudienceRestrictionXML,
CacheProvider,
CertCallback,
ErrorWithXmlStatus,
Profile,
SamlOptions,
SamlConfig,
XMLOutput,
ValidateInResponseTo,
AuthorizeRequestXML,
XMLInput,
SamlIDPListConfig,
SamlIDPEntryConfig,
LogoutRequestXML,
XMLObject,
XMLValue,
SamlResponseXmlJs,
AuthOptions,
} from "./types";
import { assertBooleanIfPresent, assertRequired } from "./utility";
import {
buildXml2JsObject,
buildXmlBuilderObject,
decryptXml,
getNameIdAsync,
parseDomFromString,
parseXml2JsFromString,
validateSignature,
xpath,
} from "./xml";
import { keyInfoToPem, generateUniqueId } from "./crypto";
import { dateStringToTimestamp, generateInstant } from "./date-time";
import { signAuthnRequestPost } from "./saml-post-signing";
import { generateServiceProviderMetadata } from "./metadata";
const inflateRawAsync = util.promisify(zlib.inflateRaw);
const deflateRawAsync = util.promisify(zlib.deflateRaw);
const resolveAndParseKeyInfosToPem = async ({
cert,
}: Pick<SamlOptions, "cert">): Promise<string[]> => {
const keyInfosToHandle: string[] = [];
const pemFiles: string[] = [];
if (typeof cert === "function") {
await util
.promisify(cert as CertCallback)()
.then((certs) => {
assertRequired(certs, "callback didn't return cert");
keyInfosToHandle.push(...(Array.isArray(certs) ? certs : [certs]));
});
} else {
keyInfosToHandle.push(...(Array.isArray(cert) ? cert : [cert]));
}
// Verify and normalize each PEM file.
keyInfosToHandle.forEach((cert) => {
pemFiles.push(keyInfoToPem(cert, "CERTIFICATE"));
});
return pemFiles;
};
class SAML {
/**
* Note that some methods in SAML are not yet marked as protected as they are used in testing.
* Those methods start with an underscore, e.g. _generateLogoutRequest
*/
options: SamlOptions;
// This is only for testing
cacheProvider: CacheProvider;
// Array of PEM files used to validate signatures.
pemFiles: string[] = [];
constructor(ctorOptions: SamlConfig) {
this.options = this.initialize(ctorOptions);
this.cacheProvider = this.options.cacheProvider;
}
initialize(ctorOptions: SamlConfig): SamlOptions {
if (!ctorOptions) {
throw new TypeError("SamlOptions required on construction");
}
assertRequired(ctorOptions.callbackUrl, "callbackUrl is required");
assertRequired(ctorOptions.issuer, "issuer is required");
assertRequired(ctorOptions.cert, "cert is required");
// Prevent a JS user from passing in "false", which is truthy, and doing the wrong thing
assertBooleanIfPresent(ctorOptions.passive);
assertBooleanIfPresent(ctorOptions.disableRequestedAuthnContext);
assertBooleanIfPresent(ctorOptions.forceAuthn);
assertBooleanIfPresent(ctorOptions.skipRequestCompression);
assertBooleanIfPresent(ctorOptions.disableRequestAcsUrl);
assertBooleanIfPresent(ctorOptions.allowCreate);
assertBooleanIfPresent(ctorOptions.wantAssertionsSigned);
assertBooleanIfPresent(ctorOptions.wantAuthnResponseSigned);
assertBooleanIfPresent(ctorOptions.signMetadata);
const options: SamlOptions = {
...ctorOptions,
passive: ctorOptions.passive ?? false,
disableRequestedAuthnContext: ctorOptions.disableRequestedAuthnContext ?? false,
additionalParams: ctorOptions.additionalParams ?? {},
additionalAuthorizeParams: ctorOptions.additionalAuthorizeParams ?? {},
additionalLogoutParams: ctorOptions.additionalLogoutParams ?? {},
forceAuthn: ctorOptions.forceAuthn ?? false,
skipRequestCompression: ctorOptions.skipRequestCompression ?? false,
disableRequestAcsUrl: ctorOptions.disableRequestAcsUrl ?? false,
acceptedClockSkewMs: ctorOptions.acceptedClockSkewMs ?? 0,
maxAssertionAgeMs: ctorOptions.maxAssertionAgeMs ?? 0,
callbackUrl: ctorOptions.callbackUrl,
issuer: ctorOptions.issuer,
audience: ctorOptions.audience ?? ctorOptions.issuer ?? "unknown_audience", // use issuer as default
identifierFormat:
ctorOptions.identifierFormat === undefined
? "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
: ctorOptions.identifierFormat,
allowCreate: ctorOptions.allowCreate ?? true,
spNameQualifier: ctorOptions.spNameQualifier,
wantAssertionsSigned: ctorOptions.wantAssertionsSigned ?? true,
wantAuthnResponseSigned: ctorOptions.wantAuthnResponseSigned ?? true,
authnContext: ctorOptions.authnContext ?? [
"urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport",
],
validateInResponseTo: ctorOptions.validateInResponseTo ?? ValidateInResponseTo.never,
cert: ctorOptions.cert,
requestIdExpirationPeriodMs: ctorOptions.requestIdExpirationPeriodMs ?? 28800000, // 8 hours
cacheProvider:
ctorOptions.cacheProvider ??
new InMemoryCacheProvider({
keyExpirationPeriodMs: ctorOptions.requestIdExpirationPeriodMs,
}),
logoutUrl: ctorOptions.logoutUrl ?? ctorOptions.entryPoint ?? "", // Default to Entry Point
signatureAlgorithm: ctorOptions.signatureAlgorithm ?? "sha1", // sha1, sha256, or sha512
authnRequestBinding: ctorOptions.authnRequestBinding ?? "HTTP-Redirect",
generateUniqueId: ctorOptions.generateUniqueId ?? generateUniqueId,
signMetadata: ctorOptions.signMetadata ?? false,
racComparison: ctorOptions.racComparison ?? "exact",
};
if (!Object.values(ValidateInResponseTo).includes(options.validateInResponseTo)) {
throw new TypeError("validateInResponseTo must be one of ['never', 'ifPresent', 'always']");
}
/**
* 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
*/
if (!["exact", "minimum", "maximum", "better"].includes(options.racComparison)) {
throw new TypeError("racComparison must be one of ['exact', 'minimum', 'maximum', 'better']");
}
return options;
}
protected signRequest(samlMessage: querystring.ParsedUrlQueryInput): void {
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(
keyInfoToPem(this.options.privateKey, "PRIVATE KEY"),
"base64",
);
}
protected async generateAuthorizeRequestAsync(
this: SAML,
isPassive: boolean,
isHttpPostBinding: boolean,
): Promise<string> {
assertRequired(this.options.entryPoint, "entryPoint is required");
const id = this.options.generateUniqueId();
const instant = generateInstant();
if (this.mustValidateInResponseTo(true)) {
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 === true) {
request["samlp:AuthnRequest"]["@ForceAuthn"] = true;
}
if (!this.options.disableRequestAcsUrl) {
request["samlp:AuthnRequest"]["@AssertionConsumerServiceURL"] = this.options.callbackUrl;
}
const samlAuthnRequestExtensions = this.options.samlAuthnRequestExtensions;
if (samlAuthnRequestExtensions != null) {
if (typeof samlAuthnRequestExtensions != "object") {
throw new TypeError("samlAuthnRequestExtensions should be Object");
}
request["samlp:AuthnRequest"]["samlp:Extensions"] = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
...samlAuthnRequestExtensions,
};
}
const nameIDPolicy: XMLInput = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
"@AllowCreate": this.options.allowCreate,
};
if (this.options.identifierFormat != null) {
nameIDPolicy["@Format"] = this.options.identifierFormat;
}
if (this.options.spNameQualifier != null) {
nameIDPolicy["@SPNameQualifier"] = this.options.spNameQualifier;
}
request["samlp:AuthnRequest"]["samlp:NameIDPolicy"] = nameIDPolicy;
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 = buildXmlBuilderObject(request, false);
// TODO: maybe we should always sign here
if (isHttpPostBinding && isValidSamlSigningOptions(this.options)) {
stringRequest = signAuthnRequestPost(stringRequest, this.options);
}
return stringRequest;
}
async _generateLogoutRequest(this: SAML, user: Profile): Promise<string> {
const id = this.options.generateUniqueId();
const instant = 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,
},
"samlp:Extensions": {},
"saml:NameID": {
"@Format": user.nameIDFormat,
"#text": user.nameID,
},
},
} as LogoutRequestXML;
const samlLogoutRequestExtensions = this.options.samlLogoutRequestExtensions;
if (samlLogoutRequestExtensions != null) {
if (typeof samlLogoutRequestExtensions != "object") {
throw new TypeError("samlLogoutRequestExtensions should be Object");
}
request["samlp:LogoutRequest"]["samlp:Extensions"] = {
"@xmlns:samlp": "urn:oasis:names:tc:SAML:2.0:protocol",
...samlLogoutRequestExtensions,
};
} else {
delete request["samlp:LogoutRequest"]["samlp:Extensions"];
}
if (user.nameQualifier != null) {
request["samlp:LogoutRequest"]["saml:NameID"]["@NameQualifier"] = user.nameQualifier;
}
if (user.spNameQualifier != null) {
request["samlp:LogoutRequest"]["saml:NameID"]["@SPNameQualifier"] = user.spNameQualifier;
}
if (user.sessionIndex) {
request["samlp:LogoutRequest"]["saml2p:SessionIndex"] = {
"@xmlns:saml2p": "urn:oasis:names:tc:SAML:2.0:protocol",
"#text": user.sessionIndex,
};
}
await this.cacheProvider.saveAsync(id, instant);
return buildXmlBuilderObject(request, false);
}
_generateLogoutResponse(this: SAML, logoutRequest: Profile, success: boolean): string {
const id = this.options.generateUniqueId();
const instant = generateInstant();
const successStatus = {
"samlp:StatusCode": {
"@Value": "urn:oasis:names:tc:SAML:2.0:status:Success",
},
};
const failStatus = {
"samlp:StatusCode": {
"@Value": "urn:oasis:names:tc:SAML:2.0:status:Requester",
"samlp:StatusCode": {
"@Value": "urn:oasis:names:tc:SAML:2.0:status:UnknownPrincipal",
},
},
};
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": success ? successStatus : failStatus,
},
};
return buildXmlBuilderObject(request, false);
}
async _requestToUrlAsync(
request: string | null | undefined,
response: string | null,
operation: string,
additionalParameters: querystring.ParsedUrlQuery,
): Promise<string> {
assertRequired(this.options.entryPoint, "entryPoint is required");
const requestOrResponse = request || response;
assertRequired(requestOrResponse, "either request or response is required");
let buffer: Buffer;
if (this.options.skipRequestCompression) {
buffer = Buffer.from(requestOrResponse, "utf8");
} else {
buffer = await deflateRawAsync(requestOrResponse);
}
const base64 = buffer.toString("base64");
let target = new URL(this.options.entryPoint);
if (operation === "logout") {
if (this.options.logoutUrl) {
target = new URL(this.options.logoutUrl);
}
} 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 (isValidSamlSigningOptions(this.options)) {
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.searchParams.set(k, samlMessage[k] as string);
});
return target.toString();
}
_getAdditionalParams(
relayState: string,
operation: "authorize" | "logout",
overrideParams?: querystring.ParsedUrlQuery,
): querystring.ParsedUrlQuery {
const additionalParams: querystring.ParsedUrlQuery = {};
if (typeof relayState === "string" && relayState.length > 0) {
additionalParams.RelayState = relayState;
}
return Object.assign(
additionalParams,
this.options.additionalParams,
operation === "logout"
? this.options.additionalLogoutParams
: this.options.additionalAuthorizeParams,
overrideParams ?? {},
);
}
async getAuthorizeUrlAsync(
RelayState: string,
host: string | undefined,
options: AuthOptions,
): Promise<string> {
const request = await this.generateAuthorizeRequestAsync(this.options.passive, false);
const operation = "authorize";
const overrideParams = options ? options.additionalParams || {} : {};
return await this._requestToUrlAsync(
request,
null,
operation,
this._getAdditionalParams(RelayState, operation, overrideParams),
);
}
async getAuthorizeMessageAsync(
RelayState: string,
host?: string,
options?: AuthOptions,
): Promise<querystring.ParsedUrlQueryInput> {
assertRequired(this.options.entryPoint, "entryPoint is required");
const request = await this.generateAuthorizeRequestAsync(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 overrideParams = options ? options.additionalParams || {} : {};
const additionalParameters = this._getAdditionalParams(RelayState, operation, overrideParams);
const samlMessage: querystring.ParsedUrlQueryInput = {
SAMLRequest: buffer.toString("base64"),
};
Object.keys(additionalParameters).forEach((k) => {
samlMessage[k] = additionalParameters[k] || "";
});
return samlMessage;
}
async getAuthorizeFormAsync(
RelayState: string,
host?: string,
options?: AuthOptions,
): Promise<string> {
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 samlMessage = await this.getAuthorizeMessageAsync(RelayState, host, options);
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(
user: Profile,
RelayState: string,
options: AuthOptions,
): Promise<string> {
const request = await this._generateLogoutRequest(user);
const operation = "logout";
const overrideParams = options ? options.additionalParams || {} : {};
return await this._requestToUrlAsync(
request,
null,
operation,
this._getAdditionalParams(RelayState, operation, overrideParams),
);
}
getLogoutResponseUrl(
samlLogoutRequest: Profile,
RelayState: string,
options: AuthOptions,
success: boolean,
callback: (err: Error | null, url?: string) => void,
): void {
util.callbackify(() =>
this.getLogoutResponseUrlAsync(samlLogoutRequest, RelayState, options, success),
)(callback);
}
async getLogoutResponseUrlAsync(
samlLogoutRequest: Profile,
RelayState: string,
options: AuthOptions,
success: boolean,
): Promise<string> {
const response = this._generateLogoutResponse(samlLogoutRequest, success);
const operation = "logout";
const overrideParams = options ? options.additionalParams || {} : {};
return await this._requestToUrlAsync(
null,
response,
operation,
this._getAdditionalParams(RelayState, operation, overrideParams),
);
}
protected async getKeyInfosAsPem(): Promise<string[]> {
if (typeof this.options.cert === "function") {
// Do not cache
return await resolveAndParseKeyInfosToPem(this.options);
} else if (this.pemFiles.length > 0) {
// Return already cached PEM files.
return this.pemFiles;
}
// Load PEM files from different sources and cache.
this.pemFiles = await resolveAndParseKeyInfosToPem(this.options);
return this.pemFiles;
}
async validatePostResponseAsync(
container: Record<string, string>,
): Promise<{ profile: Profile | null; loggedOut: boolean }> {
let xml: string;
let doc: Document;
let inResponseTo: string | null = null;
try {
xml = Buffer.from(container.SAMLResponse, "base64").toString("utf8");
doc = await parseDomFromString(xml);
const inResponseToNodes = xpath.selectAttributes(
doc,
"/*[local-name()='Response']/@InResponseTo",
);
if (inResponseToNodes) {
inResponseTo = inResponseToNodes.length ? inResponseToNodes[0].nodeValue : null;
await this.validateInResponseTo(inResponseTo);
}
const pemFiles = await this.getKeyInfosAsPem();
// Check if this document has a valid top-level signature which applies to the entire XML document
let validSignature = false;
if (validateSignature(xml, doc.documentElement, pemFiles)) {
validSignature = true;
}
if (this.options.wantAuthnResponseSigned === true && validSignature === false) {
throw new Error("Invalid document signature");
}
const assertions = xpath.selectElements(
doc,
"/*[local-name()='Response']/*[local-name()='Assertion']",
);
const encryptedAssertions = xpath.selectElements(
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 (
(this.options.wantAssertionsSigned || !validSignature) &&
!validateSignature(xml, assertions[0], pemFiles)
) {
throw new Error("Invalid signature");
}
return await this.processValidlySignedAssertionAsync(
assertions[0].toString(),
xml,
inResponseTo,
);
}
if (encryptedAssertions.length == 1) {
assertRequired(this.options.decryptionPvk, "No decryption key for encrypted SAML response");
const encryptedAssertionXml = encryptedAssertions[0].toString();
const decryptedXml = await decryptXml(encryptedAssertionXml, this.options.decryptionPvk);
const decryptedDoc = await parseDomFromString(decryptedXml);
const decryptedAssertions = xpath.selectElements(
decryptedDoc,
"/*[local-name()='Assertion']",
);
if (decryptedAssertions.length != 1) throw new Error("Invalid EncryptedAssertion content");
if (
(this.options.wantAssertionsSigned || !validSignature) &&
!validateSignature(decryptedXml, decryptedAssertions[0], pemFiles)
) {
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 xmljsDoc = (await parseXml2JsFromString(xml)) as SamlResponseXmlJs;
const response = xmljsDoc.Response;
if (response) {
if (!("Assertion" in response)) {
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(/[^:]*$/);
if (msgType && msgType[0] != "Success") {
let msg = "unspecified";
if (status[0].StatusMessage) {
msg = status[0].StatusMessage[0]._ || msg;
} else if (statusCode[0].StatusCode) {
const msgValues = statusCode[0].StatusCode[0].$?.Value.match(/[^:]*$/);
msg = msgValues ? msgValues[0] : msg;
}
const statusXml = buildXml2JsObject("Status", status[0]);
throw new ErrorWithXmlStatus(
"SAML provider returned " + msgType + " error: " + msg,
statusXml,
);
}
}
}
}
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.mustValidateInResponseTo(Boolean(inResponseTo))) {
await this.cacheProvider.removeAsync(inResponseTo);
}
throw err;
}
}
protected async validateInResponseTo(inResponseTo: string | null): Promise<void> {
if (this.mustValidateInResponseTo(Boolean(inResponseTo))) {
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");
}
}
}
async validateRedirectAsync(
container: ParsedQs,
originalQuery: string,
): 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 = await parseDomFromString(inflated.toString());
const doc: XMLOutput = await parseXml2JsFromString(inflated);
samlMessageType === "SAMLResponse"
? await this.verifyLogoutResponse(doc)
: this.verifyLogoutRequest(doc);
await this.hasValidSignatureForRedirect(container, originalQuery);
return await this.processValidlySignedSamlLogoutAsync(doc, dom);
}
protected async hasValidSignatureForRedirect(
container: ParsedQs,
originalQuery: string,
): 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");
if (getParam("RelayState")) {
urlString += "&" + getParam("RelayState");
}
urlString += "&" + getParam("SigAlg");
const pemFiles = await this.getKeyInfosAsPem();
const hasValidQuerySignature = pemFiles.some((pemFile) => {
return this.validateSignatureForRedirect(
urlString,
container.Signature as string,
container.SigAlg as string,
pemFile,
);
});
if (!hasValidQuerySignature) {
throw new Error("Invalid query signature");
}
} else {
return true;
}
}
protected validateSignatureForRedirect(
urlString: crypto.BinaryLike,
signature: string,
alg: string,
pemFile: string,
): boolean {
// See if we support a matching algorithm, case-insensitive. Otherwise, throw error.
function hasMatch(ourAlgo: string) {
// The incoming algorithm is forwarded as a URL.
// We trim everything before the last # get something we can compare to the Node.js list
const algFromURI = alg.toLowerCase().replace(/.*#(.*)$/, "$1");
return ourAlgo.toLowerCase() === algFromURI;
}
const i = crypto.getHashes().findIndex(hasMatch);
let matchingAlgo;
if (i > -1) {
matchingAlgo = crypto.getHashes()[i];
} else {
throw new Error(alg + " is not supported");
}
const verifier = crypto.createVerify(matchingAlgo);
verifier.update(urlString);
return verifier.verify(pemFile, signature, "base64");
}
protected verifyLogoutRequest(doc: XMLOutput): void {
this.verifyIssuer(doc.LogoutRequest);
const nowMs = new Date().getTime();
const conditions = doc.LogoutRequest.$;
const conErr = this.checkTimestampsValidityError(
nowMs,
conditions.NotBefore,
conditions.NotOnOrAfter,
);
if (conErr) {
throw conErr;
}
}
protected async verifyLogoutResponse(doc: XMLOutput): Promise<void> {
const statusCode = doc.LogoutResponse.Status[0].StatusCode[0].$.Value;
if (statusCode !== "urn:oasis:names:tc:SAML:2.0:status:Success")
throw new Error("Bad status code: " + statusCode);
this.verifyIssuer(doc.LogoutResponse);
const inResponseTo = doc.LogoutResponse.$.InResponseTo;
if (inResponseTo) {
return this.validateInResponseTo(inResponseTo);
}
return;
}
protected verifyIssuer(samlMessage: XMLOutput): void {
if (this.options.idpIssuer != null) {
const issuer = samlMessage.Issuer;
if (issuer) {
if (issuer[0]._ !== this.options.idpIssuer)
throw new Error(
"Unknown SAML issuer. Expected: " +
this.options.idpIssuer +
" Received: " +
issuer[0]._,
);
} else {
throw new Error("Missing SAML issuer");
}
}
}
protected async processValidlySignedAssertionAsync(
this: SAML,
xml: string,
samlResponseXml: string,
inResponseTo: string | null,
): Promise<{ profile: Profile; loggedOut: boolean }> {
let msg;
const nowMs = new Date().getTime();
const profile = {} as Profile;
const doc: XMLOutput = await parseXml2JsFromString(xml);
const parsedAssertion: XMLOutput = doc;
const assertion: XMLOutput = doc.Assertion;
getInResponseTo: {
const issuer = assertion.Issuer;
if (issuer && issuer[0]._) {
profile.issuer = issuer[0]._;
}