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strategy.ts
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strategy.ts
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import { Strategy as PassportStrategy } from "passport-strategy";
import { SAML } from "../node-saml";
import * as url from "url";
import {
AuthenticateOptions,
RequestWithUser,
SamlConfig,
VerifyWithoutRequest,
VerifyWithRequest,
} from "./types";
import { Profile } from "./types";
export abstract class AbstractStrategy extends PassportStrategy {
static readonly newSamlProviderOnConstruct: boolean;
name: string;
_verify: VerifyWithRequest | VerifyWithoutRequest;
_saml: SAML | undefined;
_passReqToCallback?: boolean;
constructor(options: SamlConfig, verify: VerifyWithRequest);
constructor(options: SamlConfig, verify: VerifyWithoutRequest);
constructor(options: SamlConfig, verify: never) {
super();
if (typeof options === "function") {
throw new Error("Mandatory SAML options missing");
}
if (!verify) {
throw new Error("SAML authentication strategy requires a verify function");
}
// Customizing the name can be useful to support multiple SAML configurations at the same time.
// Unlike other options, this one gets deleted instead of passed along.
if (options.name) {
this.name = options.name;
} else {
this.name = "saml";
}
this._verify = verify;
if ((this.constructor as typeof Strategy).newSamlProviderOnConstruct) {
this._saml = new SAML(options);
}
this._passReqToCallback = !!options.passReqToCallback;
}
authenticate(req: RequestWithUser, options: AuthenticateOptions): void {
if (this._saml == null) {
throw new Error("Can't get authenticate without a SAML provider defined.");
}
options.samlFallback = options.samlFallback || "login-request";
const validateCallback = ({
profile,
loggedOut,
}: {
profile?: Profile | null;
loggedOut?: boolean;
}) => {
if (loggedOut) {
req.logout();
if (profile) {
if (this._saml == null) {
throw new Error("Can't get logout response URL without a SAML provider defined.");
}
const RelayState =
(req.query && req.query.RelayState) || (req.body && req.body.RelayState);
return this._saml.getLogoutResponseUrl(profile, RelayState, options, redirectIfSuccess);
}
return this.pass();
}
const verified = (
err: Error | null,
user?: Record<string, unknown>,
info?: Record<string, unknown>
) => {
if (err) {
return this.error(err);
}
if (!user) {
return this.fail(info, 401);
}
this.success(user, info);
};
if (this._passReqToCallback) {
(this._verify as VerifyWithRequest)(req, profile, verified);
} else {
(this._verify as VerifyWithoutRequest)(profile, verified);
}
};
const redirectIfSuccess = (err: Error | null, url?: string | null) => {
if (err) {
this.error(err);
} else {
this.redirect(url!);
}
};
if (req.query && (req.query.SAMLResponse || req.query.SAMLRequest)) {
const originalQuery = url.parse(req.url).query;
this._saml
.validateRedirectAsync(req.query, originalQuery)
.then(validateCallback)
.catch((err) => this.error(err));
} else if (req.body && req.body.SAMLResponse) {
this._saml
.validatePostResponseAsync(req.body)
.then(validateCallback)
.catch((err) => this.error(err));
} else if (req.body && req.body.SAMLRequest) {
this._saml
.validatePostRequestAsync(req.body)
.then(validateCallback)
.catch((err) => this.error(err));
} else {
const requestHandler = {
"login-request": async () => {
try {
if (this._saml == null) {
throw new Error("Can't process login request without a SAML provider defined.");
}
const RelayState =
(req.query && req.query.RelayState) || (req.body && req.body.RelayState);
const host = req.headers && req.headers.host;
if (this._saml.options.authnRequestBinding === "HTTP-POST") {
const data = await this._saml.getAuthorizeFormAsync(RelayState, host);
const res = req.res!;
res.send(data);
} else {
// Defaults to HTTP-Redirect
this.redirect(await this._saml.getAuthorizeUrlAsync(RelayState, host, options));
}
} catch (err) {
this.error(err);
}
},
"logout-request": async () => {
if (this._saml == null) {
throw new Error("Can't process logout request without a SAML provider defined.");
}
try {
const RelayState =
(req.query && req.query.RelayState) || (req.body && req.body.RelayState);
this.redirect(
await this._saml.getLogoutUrlAsync(req.user as Profile, RelayState, options)
);
} catch (err) {
this.error(err);
}
},
}[options.samlFallback];
if (typeof requestHandler !== "function") {
return this.fail(401);
}
requestHandler();
}
}
logout(req: RequestWithUser, callback: (err: Error | null, url?: string | null) => void): void {
if (this._saml == null) {
throw new Error("Can't logout without a SAML provider defined.");
}
const RelayState = (req.query && req.query.RelayState) || (req.body && req.body.RelayState);
this._saml
.getLogoutUrlAsync(req.user as Profile, RelayState, {})
.then((url) => callback(null, url))
.catch((err) => callback(err));
}
protected _generateServiceProviderMetadata(
decryptionCert: string | null,
signingCert?: string | null
): string {
if (this._saml == null) {
throw new Error("Can't generate service provider metadata without a SAML provider defined.");
}
return this._saml.generateServiceProviderMetadata(decryptionCert, signingCert);
}
// This is reduntant, but helps with testing
error(err: Error): void {
super.error(err);
}
}
export class Strategy extends AbstractStrategy {
static readonly newSamlProviderOnConstruct = true;
generateServiceProviderMetadata(
decryptionCert: string | null,
signingCert?: string | null
): string {
return this._generateServiceProviderMetadata(decryptionCert, signingCert);
}
}