使用身份验证保护Google Cloud函数http触发 [英] Secure Google Cloud Functions http trigger with auth
问题描述
按照本指南,我今天尝试了Google Cloud Functions: https://cloud.google。 com / functions / docs / quickstart
我使用HTTP触发器创建了一个函数,并且能够执行POST请求以触发函数写入数据存储。
我想知道是否有办法保护这个HTTP端点?目前看来,它会接受来自任何地方/任何人的请求。
使用Google搜索时,我发现大多数结果都是关于如何确保Firebase的安全。然而,我并没有在这里使用Firebase服务。
我的选项是让它打开,并且希望没有人知道URL端点(默默无闻的安全性),或者在函数本身中实现我自己的验证检查?
在进一步研究之后,从@ ricka的回答中获得提示后,我已决定通过以授权头访问令牌形式传入的JWT令牌来实现对我的云功能的验证检查。
以下是Node中的实现: / p>
const client = jwksClient({
cache:true,
rateLimit:true,
jwksRequestsPerMinute :5,
jwksUri:https://< auth0-account> .auth0.com / .well-known / jwks.json
});
函数verifyToken(token,cb){
let decodedToken;
try {
decodedToken = jwt.decode(token,{complete:true});
} catch(e){
console.error(e);
cb(e);
return;
}
client.getSigningKey(decodedToken.header.kid,function(err,key){
if(err){
console.error(err);
cb(err);
return;
}
const signingKey = key.publicKey || key.rsaPublicKey;
jwt.verify(token,signingKey,function(err,decode) {
if(err){
console.error(err);
cb(err);
return
}
console.log(已解码) ;
cb(null,decode);
});
});
函数checkAuth(fn){
返回函数(req,res){
if(!req.headers ||!req.headers.authorization) {
res.status(401).send('No authorization token found。');
return;
}
const parts = req.headers.authorization.split('');
if(parts.length!= 2){
res.status(401).send('Bad credential format。');
return;
}
const scheme = parts [0];
const credentials = parts [1];如果(!/ ^ Bearer $ / i.test(scheme)){
res.status(401).send('Bad credential format。');
。
return;
verifyToken(凭证,函数(err){
if(err){
res.status(401).send('Invalid token');
返回;
}
fn(req,res);
});
};
}
我使用 jsonwebtoken
验证JWT令牌,并且 jwks-rsa
来检索公钥。我使用Auth0,所以 jwks-rsa
伸出到公钥列表中检索它们。
checkAuth
函数可以用来保护云功能,如下所示:
exports .get = checkAuth(function(req,res){
//在这里安全地做事
});
你可以在
可以通过多种方式检索JWT /访问令牌。对于Auth0,API文档可以在 https://auth0.com/docs/api / authentication#authorize-client
完成此操作后,您可以触发云端功能(如果您启用了http触发器)
$ b
curl -X POST -HContent-Type:application / json\
-H授权:承载访问令牌\
-d'{foo:bar}'\
https://< cloud-function-endpoint> .cloudfunctions.net / get
I am trying out Google Cloud Functions today following this guide: https://cloud.google.com/functions/docs/quickstart
I created a function with an HTTP trigger, and was able to perform a POST request to trigger a function to write to Datastore.
I was wondering if there's a way I can secure this HTTP endpoint? Currently it seems that it will accept a request from anywhere/anyone.
When googling around, I see most results talk about securing things with Firebase. However, I am not using the Firebase service here.
Would my options be either let it open, and hope no one knows the URL endpoint (security by obscurity), or implement my own auth check in the function itself?
After looking into this further, and taking a hint from @ricka's answer, I have decided to implement an authentication check for my cloud functions with a JWT token passed in in the form of an Authorization header access token.
Here's the implementation in Node:
const client = jwksClient({
cache: true,
rateLimit: true,
jwksRequestsPerMinute: 5,
jwksUri: "https://<auth0-account>.auth0.com/.well-known/jwks.json"
});
function verifyToken(token, cb) {
let decodedToken;
try {
decodedToken = jwt.decode(token, {complete: true});
} catch (e) {
console.error(e);
cb(e);
return;
}
client.getSigningKey(decodedToken.header.kid, function (err, key) {
if (err) {
console.error(err);
cb(err);
return;
}
const signingKey = key.publicKey || key.rsaPublicKey;
jwt.verify(token, signingKey, function (err, decoded) {
if (err) {
console.error(err);
cb(err);
return
}
console.log(decoded);
cb(null, decoded);
});
});
}
function checkAuth (fn) {
return function (req, res) {
if (!req.headers || !req.headers.authorization) {
res.status(401).send('No authorization token found.');
return;
}
const parts = req.headers.authorization.split(' ');
if (parts.length != 2) {
res.status(401).send('Bad credential format.');
return;
}
const scheme = parts[0];
const credentials = parts[1];
if (!/^Bearer$/i.test(scheme)) {
res.status(401).send('Bad credential format.');
return;
}
verifyToken(credentials, function (err) {
if (err) {
res.status(401).send('Invalid token');
return;
}
fn(req, res);
});
};
}
I use jsonwebtoken
to verify the JWT token, and jwks-rsa
to retrieve the public key. I use Auth0, so jwks-rsa
reaches out to the list of public keys to retrieve them.
The checkAuth
function can then be used to safeguard the cloud function as:
exports.get = checkAuth(function (req, res) {
// do things safely here
});
You can see this change on my github repo at https://github.com/tnguyen14/functions-datastore/commit/a6b32704f0b0a50cd719df8c1239f993ef74dab6
The JWT / access token can be retrieved in a number of way. For Auth0, the API doc can be found at https://auth0.com/docs/api/authentication#authorize-client
Once this is in place, you can trigger the cloud function (if you have yours enabled with http trigger) with something like
curl -X POST -H "Content-Type: application/json" \
-H "Authorization: Bearer access-token" \
-d '{"foo": "bar"}' \
"https://<cloud-function-endpoint>.cloudfunctions.net/get"
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