Cloud Foundry container-to-container networking via https - https

We have two applications running on ibm cloud cloud foundry (appA and appB).
appA is accessing appB over a container-to-container networking while appB is also available externally over a Gorouter route.
The thing is that while it is http-8080 our app exposes - all is good.
Now we have to do container-to-container networking over https.
We configured the app to expose https-8080. 8080 is used as https://docs.cloudfoundry.org/devguide/custom-ports.html states that:
By default, apps only receive requests on port 8080 for both HTTP and TCP routing,
and so must be configured, or hardcoded, to listen on this port
container-to-container networking works as expected now using https.
But we are no longer able to use the appB over the external Gorouter route.
What is the best way to have it all up and running as we expect?

There isn't a good answer to this question, at least at the time I write this.
You do have a couple options though:
Manually set up HTTPS for the internal route. To do this, you would need to use the instructions for your application/server of choice to configure HTTPS. Then use whatever functionality your buildpack provides to inject this confirmation into the application container. This would also require you to bundle and push TLS certs with your application. The platform isn't going to provide you TLS certs if you take this option.
The trick to making both the internal and public route work is that you need your application to listen on both port 8080 and the port you choose for your HTTPS traffic. As long as you continue taking HTTP traffic on port 8080, then your public routes should keep working.
If you want a quick, but not ideal solution you can use port 61001. For newer versions of Cloud Foundry, this port is used by Envoy to accept traffic to your app over HTTPS. Envoy then proxies the request to your app via HTTP over port 8080. You can use this port for your container to container traffic as well, however the configured subject name on the TLS cert won't match your route.
Here's an example of what the subject name will look like.
subject: OU=organization:639f74aa-5d97-4a47-a6b3-e9c2613729d8 + OU=space:10180e2b-33b9-44ee-9f8f-da96da17ac1a + OU=app:10a4752e-be17-41f5-bfb2-d858d49165f2; CN=b7520259-6428-4a52-60d4-5f25
Because it's using this format, you would need to have your clients ignore certificate subject name match errors (not ideal as that weakens HTTPS), or perhaps create a custom hostname matcher.
For what it's worth, I don't think you want or need to change the port. That is typically used if your application is not flexible and unable to listen on port 8080. It changes the port for inbound traffic. Since you're only using C2C networking, you don't need that option.
What you want, from what I understand, is that you want HTTPS for C2C traffic. In that case, the public traffic doesn't matter. It can still go through Gorouter to port 8080. For your container-to-container traffic, you can pick any port you want. You just need to make sure the port you choose has network policy set to allow that traffic (by default all C2C traffic is blocked). Once the network policy is set, you can connect directly over whatever port you designate.

Related

Restrict insecure web socket protocol connections in PCF

We are hosting an application in the preprod azure PCF environment which exposes websocket endpoints for client devices to connect to. Is there a prescribed methodology to secure the said websocket endpoint using TLS/SSL when hosted on PCF and running behind the PCF HAProxy?
I am having trouble interpreting this information, as in, are we supposed to expose port 4443 on the server and PCF shall by default pick it up to be a secure port that ensures unsecured connections cannot be established? Or does it require some configuration to be done on HAProxy?
Is there a prescribed methodology to secure the said websocket endpoint using TLS/SSL when hosted on PCF and running behind the PCF HAProxy?
A few things:
You don't need to configure certs or anything like that when deploying your app to PCF. The platform takes care of all that. In your case, it'll likely be handled by HAProxy, but it could be some other load balancer or even Gorouter depending on your platform operations team installed PCF. The net result is that TLS is first terminated before it hits your app, so you don't need to worry about it.
Your app should always force users to HTTPS. How you do this depends on the language/framework you're using, but most have some functionality for this.
This process generally works by checking to see if the incoming request was over HTTP or HTTPS. If it's HTTP, then you issue a redirect to the same URL, but over HTTPS. This is important for all apps, not just ones using WebSockets. Encrypt all the things.
Do keep in mind that you are behind one or more reverse proxies, so if you are doing this manually, you'll need to consider what's in x-forwarded-proto or x-forwarded-port, not just the upstream connection which would be Gorouter, not your client's browser.
https://docs.pivotal.io/platform/application-service/2-7/concepts/http-routing.html#http-headers
If you are forcing your user's to HTTPS (#1 above), then your users will be unable to initiate an insecure WebSocket connection to your app. Browsers like Chrome & Firefox have restrictions to prevent an insecure WebSocket connection from being made when the site was loaded over HTTPS.
You'll get a message like The operation is insecure in Firefox or Cannot connect: SecurityError: Failed to construct 'WebSocket': An insecure WebSocket connection may not be initiated from a page loaded over HTTPS. in Chrome.
I am having trouble interpreting this information, as in, are we supposed to expose port 4443 on the server and PCF shall by default pick it up to be a secure port that ensures unsecured connections cannot be established? Or does it require some configuration to be done on HAProxy?
From the application perspective, you don't do anything different. Your app is supposed to start and listen on the assigned port, i.e. what's in $PORT. This is the same for HTTP, HTTP, WS & WSS traffic. In short, as an app developer you don't need to think about this when deploying to PCF.
The only exception would be if your platform operations team uses a load balancer that does not natively support WebSockets. In this case, to work around the issue they need to separate traffic. HTTP and HTTPS go on the traditional ports 80 and 443, and they will route WebSockets on a different port. The PCF docs recommend 4443, which is where you're probably seeing that port. I can't tell you if your platform is set up this way, but if you know that you're using HAproxy, it is probably not.
https://docs.pivotal.io/platform/application-service/2-8/adminguide/supporting-websockets.html
At any rate, if you don't know just push an app and try to initiate a secure WebSocket connection over port 443 and see if it works. If it fails, try 4443 and see if that works. That or ask your platform operations team.
For what it's worth, even if your need to use port 4443 there is no difference to your application that runs on PCF. The only difference would be in your JavaScript code that initiates the WebSocket connection. It would need to know to use port 4443 instead of the default 443.

Send the request to Proxy server from Web server

I made a proxy server in python 3. It listens on the port 4444. It basically receives the request from clients and sends it to the server. I want to use it as a firewall to my Dvwa server. So added another functionality to the proxy. What it does is, before sending the request to the DVWA server, it validates the input.
But the problem is, the clients have to configure their proxy settings in the browser to use my proxy server. Is there any way to access the proxy without configuring the browser settings. Basically I want to host the proxy server instead of the original web server. So that all the traffic goes through the proxy before going to the webserver.
Thanks in advance...
You don't say whether your Python3 proxy is hosted on the same machine as the DVWA.
Assuming it is, the solution is simple: a reverse-proxy configuration. Your proxy transparently accepts and forwards requests to your server who then processes them and sends them back via the proxy to the client.
Have your proxy listen on port 80
Have the DVWA listen on a port other than 80 so it's not clashing (e.g. 8080)
Your proxy, which is now receiving requests for the IP/hostname which would otherwise go to the DVWA, then forwards them as usual.
The client/web browser is none the wiser that anything has changed. No settings need changing.
That's the best case scenario, given the information provided in your question. Unfortunately, I can't give any alternative solutions without knowing the network layout, where the machines reside, and the intent of the project. Some things to consider:
do you have a proper separation of concerns for this middleware you're building?
what is the purpose of the proxy?
is it for debugging/observing traffic?
are you actually trying to build a Web Application Firewall?

Creating a IPv6 to IPv4 proxy server in Google compute engine

I have an ios app that needs an API to works yet this API is deployed using Kubernetes that doesn't support IPv6 for now.
I am intending to create proxy server that do the redirection of packets to the actual api. How could be done using google compute engine? A load balancer?
You do not need a proxy but a reverse-proxy. Therefore, yes a load balancer is a way to comply to your need. Do not forget to configure the DNS with the IPv4 and IPv6 addresses of the load balancer.
But when you say I have an ios app that needs an API to works [...] support IPv6. If what you are saying is based on the fact that Apple wants iOS apps in their store to support IPv6, note that having an IPv6 server is not compulsory. Apple expects your client application to work correctly when connected to an IPv6-only network, but that IPv6-only network MUST help your application by offering a DNS resolver that is DNS64 compliant and also offering a NAT64 IPv6-to-IPv4 translation gateway. This means your client application makes a DNS request to www.myipv4onlyserver.com and the resolver replies with a fake IPv6 address routed to a NAT64 gateway. Thus, your client application talks with IPv6 to this gateway and this gateway translates the data channel to your IPv4 server, like a transparent proxy.
So, to be compliant with Apple expectations, if you only use high-level network libraries and address-agnostic APIs, such as getaddrinfo() and getnameinfo(), then you do not need to support IPv6 on the server side.
At the moment, GCE instance don't support IPv6, so you cannot terminate IPv6 on an instance or set up the (reverse) proxy yourself.
However Google Cloud HTTP(S), SSL and TCP proxy do support IPv6. You could use this to accept IPv6 connections and forward them to your GKE nodes. It might even be possible to do this with the HTTP LB created as part of a Kubernetes Ingress, and thus have it automatically connected to the correct pods.

Bind Asp.NET WebApi through port 21

This may not be the correct place for this question as it's part networking, but here goes.
I am wanting to put together a WebApi (using the ASP.NET MVC WebApi framework) to be consumed by client machines external to our network. However the client machines resolve web traffic through a proxy server for which our software does not have authentication. We have noticed that outgoing FTP connections are possible though.
So I am wondering whether we can host the webapi and have client machines connect out through Port 21? Does that even make sense? Sorry if it's a stupid question.
I managed to find some answers and thought I would share for anyone that might be interested.
Binding WebApi to ports other than 80
This is possible, but tricky. When you publish the Api project onto IIS (or wherever you are hosting it) you just bind it to an alternative port. You then also make sure you forward that port in your router. Then, clients of the API just specify the host using your custom port to access the endpoint through that port: http://myhostname.com:21/api/values or whatever.
Complications
Testing the endpoints can be tricky as Chrome blocks HTTP traffic being sent via some ports - port 21 is one such port. So to test it you need to write a client exe that can hit the endpoints to make sure they are working (like a console application).
Despite figuring all of this out, I still could not connect out through the firewall. I suspect that some configuration is blocking the traffic because even though it is going out through an open port (21), it is not FTP traffic: it's HTTP traffic.
A Solution
It occurred to me that SOAP operates through a range of protocols (FTP, SMTP, HTTP, to name a few) and formats its messages as XML. So in this scenario it would make more sense to use a SOAP service via Port 21 rather than REST which is strictly HTTP.

Play Framework HTTPS Proxy

I have a Play! Application which needs to use HTTP and HTTPS. The application is running behind a proxy server (using Apache) that forwards web requests to the play application.
The proxy is using one port for HTTP requests, and another port that is intended for HTTPs requests. Note that the ports on the proxy are not the same ports as the ones used by the Play application (this is due to provider restrictions!).
The Play application is using the "standard" ports 9000 for HTTP and 9443 for HTTPs. The proxy receives HTTP requests on Port 8080 and forwards them to Play's port 9000. The proxy receives HTTPs requests on Port 8090 and forwards them to Play's port 9443.
My problem is that when I use the secure() method of making pages appear in Play, Play's logic causes the app to attempt to use 9443 as the port for HTTPs. This causes the request to be lost because the proxy is using a different port.
The same appears to happen when I want to switch from HTTPs to HTTP. I cannot seem to make the system go to the port used by the proxy.
Somehow I need to make the system go to the ports known to the proxy server, without screwing up my routes. Is there some way to do this?
Thanks in advance for any help/insights.
I have found my own "answer", though it is somewhat of a cludge.
It turns out that, based on what I can ascertain from the documentation, there really is no way to tell Play to switch between ports when a Play application is behind a proxy. This is because while Play does recognize the port that a request comes in on, it has no way of telling what proxy port it should use when going between secure and unsecure ports. It knows, for example, that an HTTP request comes through a proxy port 8080, and it knows that subsequent requests to its port 9000 will come from that proxy port. What it does not know to do is to switch to another proxy port when someone attempts to use https to access its port 9443. Consequently, if you have a page like
http://toproxy:8080/links that has one or more links that use the secure() method to activate https, then Play will resolve the link to be https://toproxy:8080 -- despite the fact that the proxy server may want to use port 8090 for HTTPS requests. Because proxy port 8080 is redirected to Play's port 9000, use of that port for HTTPS requests always fails. This is true in Play 2.0 as well as Play 1.X.
I believe that Play needs some standard configuration parameter that can tell it to map proxy ports to its HTTP and HTTPS ports. That way, when it is behind a proxy server a developer can use the secure() method and Play will be able to resolve the URL to the correct proxy port. This capability should be available in 1.X as well as Version 2.
Until someone actually implements this (I might if I ever get the time, but with all that I am committed to do people shouldn't hold their breath), my cludge is to simply use the rediirect() method to switch between HTTP and HTTPS proxy ports. The redirect() method apparently allows us to enter full URLs, so I simply call the full URL of the page that I switch requests on.
For example: in the aforementioned page http://toproxy:8080/links, I may have a link to a login page that I want to protect using HTTPS. To do this I create two actions: one for the redirect to the proxy HTTPS port (for this example, call it gotoLogin()) and another for actually rendering the login page (for this example, call it loginPage() and give it a route of /loginpage).
In gotoLogin() I redirect to loginPage in the following manner:
redirect("https://toproxy:8090/loginpage");
This makes Play come in on proxy port 8090, which is redirected to Play's port 9443.
When the user properly logs in, my authentication action simply uses another redirect() call:
redirect("http://toproxy:8080/destination_page");
This causes Play to go back to the proper proxy port for unsecured requests.
This is not the best solution for this problem. There is a possibility that the proxy server can be somehow configured to make the proper switch between HTTP and HTTPS ports, but investigating this may take some time for someone not an expert in proxy server configuration (which describes me!). Of course, the best solution would be to implement in Play the kind of proxy port handling that I have previously described.
But this solution works and can be adapted to many different situations. Unless someone comes up with another better solution, this solution is the one I am using.
Play should recognise the port the request is coming from, and use that port. It is possible your apache config is not set up correctly.
Have you put the following line in your apache config?
ProxyPreserveHost on
You may also need XForwardedSupport=127.0.0.1 depending on your server configuration.

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