coolaj86/issuer.rest.walnut.js
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changed sub conflict checking when getting keys

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tigerbot 2017-11-02 16:11:18 -06:00
parent 0e23100233
commit 19d153283e
1 changed files with 51 additions and 46 deletions
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97
jwks.js
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@ -33,58 +33,63 @@ function thumbprint(jwk) {
return PromiseA.resolve(makeB64UrlSafe(hash));
}
function sanitizeJwk(jwk) {
// We need to sanitize the key to make sure we don't deliver any private keys fields if
// we were given a key we could use to sign tokens on behalf of the user. We also don't
// want to deliver the sub or any other PPIDs.
var whitelist = ['kty', 'alg', 'kid', 'use'];
if (jwk.kty === 'EC') {
whitelist = whitelist.concat(['crv', 'x', 'y']);
} else if (jwk.kty === 'RSA') {
whitelist = whitelist.concat(['e', 'n']);
}
var result = {};
whitelist.forEach(function (key) {
result[key] = jwk[key];
});
return result;
}
function create(app) {
var restful = {};
async function getRawKey(req) {
var store = await req.getSiteStore();
if (req.params.kid === req.experienceId) {
return store.IssuerOauth3OrgPrivateKeys.get(req.experienceId);
}
// The keys are stored by the issuer PPID, but the sub we have might be a different PPID
// for a 3rd party. As such we need to look up the subject in the grants to get the issuer
// PPID and to make sure there wasn't some kind of error that allowed multiple users to
// somehow use the same PPID.
var results = await Promise.all([
store.IssuerOauth3OrgGrants.find({ sub: req.params.sub }),
store.IssuerOauth3OrgGrants.find({ azpSub: req.params.sub }),
]);
var subList = [].concat.apply([], results).map(grant => grant.sub);
subList = subList.filter((sub, ind, list) => list.indexOf(sub) === ind);
if (!subList.length) {
throw new OpErr("unknown PPID '" + req.params.sub + "'");
}
if (subList.length > 1) {
// This should not ever happen since there is a check for PPID collisions when saving
// grants, but it's probably better to have this check anyway just incase something
// happens that isn't currently accounted for.
throw new OpErr('PPID collision - unable to safely retrieve keys');
}
return store.IssuerOauth3OrgJwks.get(subList[0] + '/' + req.params.kid);
}
restful.get = function (req, res) {
// The sub in params is the 3rd party PPID, but the keys are stored by the issuer PPID, so
// we need to look up the issuer PPID using the 3rd party PPID.
var promise = req.getSiteStore().then(function (store) {
if (req.params.kid === req.experienceId) {
return store.IssuerOauth3OrgPrivateKeys.get(req.experienceId);
}
// First we check to see if the key is being requested by the `sub` that we as the issuer use
// to identify the user, and if not then we need to look up the specified `sub` to see if
// we can determine which (if any) account it's associated with.
return store.IssuerOauth3OrgJwks.get(req.params.sub+'/'+req.params.kid).then(function (jwk) {
if (jwk) {
return jwk;
}
return store.IssuerOauth3OrgGrants.find({ azpSub: req.params.sub }).then(function (results) {
if (!results.length) {
throw new OpErr("unknown PPID '"+req.params.sub+"'");
}
if (results.length > 1) {
// This should not ever happen since there is a check for PPID collisions when saving
// grants, but it's probably better to have this check anyway just incase something
// happens that isn't currently accounted for.
throw new OpErr('PPID collision - unable to safely retrieve keys');
}
return store.IssuerOauth3OrgJwks.get(results[0].sub+'/'+req.params.kid);
});
});
}).then(function (jwk) {
var promise = PromiseA.resolve(getRawKey(req)).then(function (jwk) {
if (!jwk) {
throw new OpErr("no keys stored with kid '"+req.params.kid+"' for PPID "+req.params.sub);
}
// We need to sanitize the key to make sure we don't deliver any private keys fields if
// we were given a key we could use to sign tokens on behalf of the user. We also don't
// want to deliver the sub or any other PPIDs.
var whitelist = [ 'kty', 'alg', 'kid', 'use' ];
if (jwk.kty === 'EC') {
whitelist = whitelist.concat([ 'crv', 'x', 'y' ]);
} else if (jwk.kty === 'RSA') {
whitelist = whitelist.concat([ 'e', 'n' ]);
}
var result = {};
whitelist.forEach(function (key) {
result[key] = jwk[key];
});
return result;
return sanitizeJwk(jwk);
});
app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve JWK");