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CORS and Javascript
Integration in the browser
Michael Neale
@michaelneale

Friday, 25 October 13
Integration in the browser
Lots of services, microservices
Everything has an API
JSON == lingua franca
Why have servers that are just text pumps:
Integrate into new apps in the browser

Friday, 25 October 13
For example

Friday, 25 October 13
JSON !!111

App service
Friday, 25 October 13

repos

CI server
but - same origin policy?

http://en.wikipedia.org/wiki/Same-origin_policy
Friday, 25 October 13
but - same origin policy?
Web security model - not bad track record.
Not going to change... so, how to work around:

Friday, 25 October 13
integration middleware?

Friday, 25 October 13
Overkill

Friday, 25 October 13
JSON-P
Add “padding”.
JSON P: take pure json, make it a function call - then
eval it in the browser.
Same Origin Policy doesn’t apply to resource loading
(script tags)

Friday, 25 October 13
jsonp: Most glorious hack
ever

Friday, 25 October 13
JSON-P
JSON: { “foo” : 42 }
JSONP: callback({ “foo” : 42 });
Widely supported (both by servers and of course
jquery & co make it transparent)

Friday, 25 October 13
direct to origin:
$.ajax({
dataType : "json"
...
});

Friday, 25 October 13
JSON-P cross domain
$.ajax({
dataType : "jsonp",
jsonp:'jsonp'
....
});

Friday, 25 October 13
JSON-P
What it is really doing: creating script tags, and
making your browser “eval” the lot. Each time, each
request.
Don’t think too hard about it...

Friday, 25 October 13
JSON-P
Really misses the “spirit” of same-origin.
Security holes: any script you bring in has access to
your data/dom/private parts.
How secure is server serving up json-p?

Friday, 25 October 13
JSON-P
Also, JSON is not Javascript
JSON can be safely read - no eval
JSON-P only eval
JSONP is GET only

Friday, 25 October 13
CORS
http://en.wikipedia.org/wiki/Crossorigin_resource_sharing
Allows servers to specify who/what can access
endpoint directly
Use plain JSON, ALL HTTP Verbs: PUT, DELETE
etc

Friday, 25 October 13
CORS

Friday, 25 October 13
NOT THESE:

Friday, 25 October 13

Oy, they’re my sisters yer lookin at
CORS
Trivial to consume: plain web calls, direct.
Complexity: on the server/config side.
Browser support: complete(ish):
http://enable-cors.org/
All verbs, all data types

Friday, 25 October 13
CORS - client side ex.
$.ajax({
dataType : "json",
xhrFields: {
withCredentials: true
}
...
});

Friday, 25 October 13
How it works
Most work is between browser and server, via http
headers.
“Pre flight checks”:
Browser passes Origin header to server:
Origin: http://www.example-social-network.com

Server responds (header) saying what is allowed:
Access-Control-Allow-Origin: http://www.example-social-network.com

Friday, 25 October 13
How it works
browser

server
http OPTIONS (Origin: http://boo.com)
Access-Control-Allow.... etc

preflight

direct http GET /POST (as allowed by Access headers)

...

Friday, 25 October 13

your
app
How it works
“Pre flight checks”:
Performed by browser, opaque to client app.
Browser enforces. You don’t see them.
Uses “OPTION” http verb.

Friday, 25 October 13
Security Theatre?
“Pre flight checks”:
Can be just an annoyance.
Access-Control-Allow-Origin: *

Downside: allows any script with right creds to pull
data from you (do you want this? Think, as always)

Friday, 25 October 13
Common pattern
Access-Control-Allow-Origin: $origin-from-request

The returned value is really echoing back what Origin
was - checked off against a whitelist:
Server needs to know whitelist, how to check, return
value dynamically.
Not a static web server config. SAD FACE.

Friday, 25 October 13
Middleware
All app server environments have a way to do the
Right Thing with CORS headers:
Rack-cors: ruby
Servlet-filter: java
Node: express middleware
etc...
(it isn’t hard, just not as easy as it should be)
http://stackoverflow.com/questions/7067966/how-to-allowcors-in-express-nodejs

Friday, 25 October 13
Other CORS headers
Access-Control-Allow-Headers (headers to be
included in requests)
Access-Control-Allow-Methods: GET, PUT, POST,
DELETE etc
Access-Control-Allow-Credentials: boolean
(lists always comma separated)

Friday, 25 October 13
Authorization
You can use per request tokens, eg OAuth
OpenID and OAuth based sessions will work
(browser has done redirect “dance” - AccessControl-Allow-Credentials: true -- needed to ensure
cookies/auth info flows with requests)

Friday, 25 October 13
Authorization
requests
authorization your app
identity/auth
pre-flight

Friday, 25 October 13

browser
Debugging
Pesky pre-flight checks are often opaque - may
show up as “cancelled” requests without a reason.
Use chrome://net-internals/#events

Friday, 25 October 13
Debugging
Following screen cap shows it working...
note the match between Origin and Access-control if you don’t see those headers in response something is wrong.

Friday, 25 October 13
Friday, 25 October 13
Friday, 25 October 13
Debugging
t=1374052796709 [st=262]
t=1374052796709 [st=262]
t=1374052796709 [st=262]

+URL_REQUEST_BLOCKED_ON_DELEGATE
CANCELLED
-URL_REQUEST_START_JOB
--> net_error = -3 (ERR_ABORTED)

[dt=0]

This is it failing: look for “cancelled”.
Could be due to incorrect headers returned, or
perhaps Authorization failures (cookies, session etc)

Friday, 25 October 13
My Minimal Setup
 Access-Control-Allow-Methods: GET, POST, PUT, DELETE
 Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: $ORIGIN

$ORIGIN = if (inWhitelist(requestOriginHeader) return
requestOriginHeader
INCLUDE PORTS IN Access-Control-Allow-Origin!!

Friday, 25 October 13
Example (express)
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});

node and express js:
http://enable-cors.org/server_expressjs.html

Friday, 25 October 13
Example (rack/ruby)
gem install rack-cors
...
in config/application.rb:
...
config.middleware.use Rack::Cors do
allow do
origins '*'
resource '*', :headers => :any, :methods => [:get, :post, :options]
end
end

https://github.com/cyu/rack-cors

Friday, 25 October 13
Read more
enable-cors.org

Friday, 25 October 13
Thank you

Michael Neale
https://twitter.com/michaelneale
https://developer-blog.cloudbees.com

Friday, 25 October 13

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Cross site calls with javascript - the right way with CORS