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token_handler.js
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token_handler.js
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const jwt = require("jsonwebtoken");
const jwkToPem = require("jwk-to-pem");
const config = require("./config");
const Lib = require("./lib");
module.exports = async (req, res) => {
// Require "application/x-www-form-urlencoded" POSTs -----------------------
let ct = req.headers["content-type"] || "";
if (ct.indexOf("application/x-www-form-urlencoded") !== 0) {
return Lib.replyWithOAuthError(res, "invalid_request", {
message: "form_content_type_required"
});
}
// grant_type --------------------------------------------------------------
if (!req.body.grant_type) {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "Missing grant_type parameter"
});
}
if (req.body.grant_type != "client_credentials") {
return Lib.replyWithOAuthError(res, "unsupported_grant_type", {
message: "The grant_type parameter should equal 'client_credentials'"
});
}
// client_assertion_type ---------------------------------------------------
if (!req.body.client_assertion_type) {
return Lib.replyWithOAuthError(res, "invalid_request", {
message: "missing_client_assertion_type"
});
}
if (req.body.client_assertion_type != "urn:ietf:params:oauth:client-assertion-type:jwt-bearer") {
return Lib.replyWithOAuthError(res, "invalid_request", {
message: "invalid_client_assertion_type"
});
}
// client_assertion must be a token ----------------------------------------
let authenticationToken;
try {
authenticationToken = Lib.parseToken(req.body.client_assertion);
} catch (ex) {
return Lib.replyWithOAuthError(res, "invalid_request", {
message: "invalid_registration_token",
params : [ ex.message ]
});
}
// The client_id must be a token -------------------------------------------
let clientDetailsToken;
try {
clientDetailsToken = Lib.parseToken(authenticationToken.sub);
} catch (ex) {
return Lib.replyWithOAuthError(res, "invalid_request", {
message: "invalid_client_details_token",
params : [ ex.message ]
});
}
// simulate expired_registration_token error -------------------------------
if (clientDetailsToken.err == "token_expired_registration_token") {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "token_expired_registration_token"
});
}
// Validate authenticationToken.aud (must equal this url) ------------------
let tokenUrl = config.baseUrl + req.originalUrl;
if (tokenUrl.replace(/^https?/, "") !== authenticationToken.aud.replace(/^https?/, "")) {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "invalid_aud",
params: [ tokenUrl ]
});
}
// Validate authenticationToken.iss (must equal whatever the user entered at
// registration time, i.e. clientDetailsToken.iss)
if (authenticationToken.iss && authenticationToken.iss !== authenticationToken.sub) {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "invalid_token_iss",
params: [ authenticationToken.iss, authenticationToken.sub ]
});
}
// simulated invalid_jti error ---------------------------------------------
if (clientDetailsToken.err == "invalid_jti") {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "invalid_jti"
});
}
// Validate scope ----------------------------------------------------------
// Note that the scope check if FHIR version dependent and makes sure that
// no unknown resources are involved. However, this code is common for every
// FHIR version so we just use "4" here.
let tokenError = await Lib.getInvalidSystemScopes(req.body.scope, 4);
if (tokenError) {
return Lib.replyWithOAuthError(res, "invalid_scope", {
message: "invalid_scope",
params: [ req.body.scope ]
});
}
// simulated token_invalid_scope -------------------------------------------
if (clientDetailsToken.err == "token_invalid_scope") {
return Lib.replyWithOAuthError(res, "invalid_scope", {
message: "token_invalid_scope"
});
}
// Get the authentication token header
let header = jwt.decode(req.body.client_assertion, { complete: true, json: true }).header;
// Get the "kid" from the authentication token header
let kid = header.kid;
// If the jku header is present, verify that the jku is whitelisted
// (i.e., that it matches the value supplied at registration time for
// the specified `client_id`).
// If the jku header is not whitelisted, the signature verification fails.
if (header.jku && header.jku !== clientDetailsToken.jwks_url) {
return Lib.replyWithOAuthError(res, "invalid_grant", {
message: "jku_not_whitelisted",
params: [ header.jku, clientDetailsToken.jwks_url ]
});
}
// Start a task to fetch the JWKS
Promise.resolve()
.then(() => {
// Case 1: Remote JWKS -------------------------------------------------
// If the jku header is whitelisted, create a set of potential keys
// by dereferencing the jku URL
if (header.jku && clientDetailsToken.jwks_url) {
return Lib.fetchJwks(clientDetailsToken.jwks_url)
.then(json => {
if (!Array.isArray(json.keys)) {
Lib.replyWithOAuthError(res, "invalid_grant", {
message: "The remote jwks object has no keys array."
});
return Promise.reject();
}
return json.keys
}).catch(error => {
Lib.replyWithOAuthError(res, "invalid_client", {
message: "Requesting the remote JWKS returned an error.\n" + error
});
return Promise.reject();
});
}
// Case 2: Remote + local JWKS -----------------------------------------
// If jku is absent, create a set of potential key sources consisting of:
// all keys found by dereferencing the registration-time JWKS URI (if any)
// + any keys supplied in the registration-time JWKS (if any)
if (clientDetailsToken.jwks_url) {
return Lib.fetchJwks(clientDetailsToken.jwks_url)
.then(json => json.keys)
.then(keys => {
// keys supplied in the registration-time JWKS (if any)
if (clientDetailsToken.jwks) {
keys = keys.concat(clientDetailsToken.jwks.keys);
}
return keys;
}).catch(error => {
Lib.replyWithOAuthError(res, "invalid_client", {
message: "Requesting the remote JWKS returned an error.\n" + error
});
return Promise.reject();
});
}
// Case 3: Local JWKS --------------------------------------------------
if (clientDetailsToken.jwks && typeof clientDetailsToken.jwks == "object") {
if (!Array.isArray(clientDetailsToken.jwks.keys)) {
Lib.replyWithOAuthError(res, "invalid_grant", {
message: "The registration-time jwks object has no keys array."
});
return Promise.reject();
}
return clientDetailsToken.jwks.keys;
}
// Case 4: No JWKS -----------------------------------------------------
Lib.replyWithOAuthError(res, "invalid_grant", {
message: "No JWKS found. No 'jku' token header is set, no " +
"registration-time jwks_url is available and no " +
"registration-time jwks is available."
});
return Promise.reject();
})
// Filter the potential keys to retain only those where the kty and
// kid match the values supplied in the client's JWK header.
.then(keys => {
let publicKeys = keys.filter(key => {
if (Array.isArray(key.key_ops) && key.key_ops.indexOf("verify") == -1) {
return false;
}
// return (key.kid === kid && key.kty === header.kty);
return key.kid === kid;
});
if (!publicKeys.length) {
Lib.replyWithOAuthError(res, "invalid_grant", {
message: `No public keys found in the JWKS with "kid" equal to "${kid
}" and "kty" equal to "${header.kty}"`
});
return Promise.reject();
}
return publicKeys;
})
// Attempt to verify the JWK using each key in the potential keys list.
// - If any attempt succeeds, the signature verification succeeds.
// - If all attempts fail, the signature verification fails.
.then(publicKeys => {
let success = publicKeys.some(key => {
/**
* @type {import("jsonwebtoken").Algorithm}
*/
const algorithm = key.alg;
try {
jwt.verify(
req.body.client_assertion,
jwkToPem(key),
{ algorithms: [algorithm] }
);
return true;
} catch(ex) {
// console.error(ex);
return false;
}
});
if (!success) {
Lib.replyWithOAuthError(res, "invalid_grant", {
message: "Unable to verify the token with any of the public keys found in the JWKS"
});
return Promise.reject();
}
})
.then(() => {
if (clientDetailsToken.err == "token_invalid_token") {
Lib.replyWithOAuthError(res, "invalid_client", {
message: "sim_invalid_token",
code : 401
});
return Promise.reject();
}
const expiresIn = clientDetailsToken.accessTokensExpireIn ?
clientDetailsToken.accessTokensExpireIn * 60 :
config.defaultTokenLifeTime * 60;
var token = Object.assign({}, clientDetailsToken.context, {
token_type: "bearer",
scope : clientDetailsToken.scope,
client_id : req.body.client_id,
expires_in: expiresIn
});
// sim_error
if (clientDetailsToken.err == "request_invalid_token") {
token.err = "Invalid token";
} else if (clientDetailsToken.err == "request_expired_token") {
token.err = "Token expired";
}
// access_token
token.access_token = jwt.sign(token, config.jwtSecret, { expiresIn });
res.json(token);
})
.catch((e) => {
res.end(e)
});
};