For example, I have a development site on a different server but I'm trying to copy content over from the live site so it'd be handy to have the live site in IE and the dev site in FF.
I tried FoxyProxy but I can't seem to get it to work.
I use this to override system's DNS with localserver
in about:config
change this value:
network.dns.forceResolve
network.dns.ipv4OnlyDomains
network.dns.localDomains
with IP address of local DNS server (for exsample 192.168.1.88)
Sorry for my english
It's now possible, with the DNS over HTTPS function:
Open Options, General, scroll to very bottom and open Network Settings,
On the very bottom, you can find DNS over HTTPS:
You had to use about:config before to change this setting, here's for documentation:
Type about:config in firefox address bar.
search for:
network.trr.uri
You can use one of the DNS servers below:
Cloudflare: https://cloudflare-dns.com/dns-query
Google: https://dns.google/dns-query
Secure DNS EU: https://doh.securedns.eu/dns-query
Quad 9: https://dns.quad9.net/dns-query
And set network.trr.mode to 1
Hijacked from here:
https://www.ghacks.net/2018/04/02/configure-dns-over-https-in-firefox/
It appears from your question that you already have a second set of DNS servers available that reference the development site instead of the live site.
I would suggest that you simply run a standard SOCKS proxy either on that DNS server system or on a low-end spare system and have that system configured to use the development DNS server. You can then tell Firefox to use that proxy instead of downloading pages directly.
Doing it this way, the actual DNS lookups will be done on the proxy machine and not on the machine that's running the web browser.
DNS resolving is usually done at the system level and not at the application level, so you can't normally have one program use one dns and another program use a different dns. I'm not aware of any firefox extensions that allow you to use a different dns.
What about having different names for your dev and prod servers? That should avoid any confusions and you'd not have to edit the hosts file every time.
I am using the SwitchHost extension exactly for this problem:
https://addons.mozilla.org/en-US/firefox/addon/14258
It is easy to configure, and even more easy to switch hosts.
I wonder if you could write a custom rule for Fiddler to do what you want? IE uses no proxy, Firefox points to Fiddler, Fiddler uses custom rule to direct requests to the dev server...
http://www.fiddlertool.com/fiddler/
Since http proxy protocol is similar to raw http protocol, you can redirect desired traffic to your development server by telling firefox it's a proxy server.
two limitations:
A. this won't let you use https connections.
B. some frameworks (e,g: wordpress) don't like this method and redirect the request the wrong way
just copy the following code into a .pac file (enter your site domain and IP address, of course), and switch development/production just by changing proxy configuration.
function FindProxyForURL(url, host) {
var prox4site = {
"mysite.com":"PROXY 10.0.1.100:80",
"www.mysite.com":"PROXY 10.0.1.100:80"
}
return prox4site[host] || "DIRECT";
}
Go to options->Advanced->Network->Settings->Automatic proxy configuration url and enter 8.8.8.8 All you Mozilla traffic uses Google dns now.
Related
I am trying to build a new DNS, which will act as a proxy for certain domain names and uses a public DNS as upstream.
My understanding of DNS:
Client asks DNS (x.x.x.x) about example.com
DNS will look up inside its zones (or parent and root) and find example.com can be found at i.i.i.i
DNS will send i.i.i.i to the client.
Now, client asks the ip address of restricted.test and DNS server knows it is a restricted website, so instead of giving the direct ip to the website, it gives it's own proxy address p.p.p.p to the client.
Please correct me if I'm wrong till now, but when the client tries to connect to p.p.p.p how the proxy server knows which website the client wants to go in?
I really want to know how these work under the hood
Thanks in advance.
This mechanism you are asking about is the Proxy Auto-Configuration (PAC) file.
Read more about it here :
https://developer.mozilla.org/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file
And here :
https://www.websense.com/content/support/library/web/v76/pac_file_best_practices/PAC_explained.aspx
Essentially in corporate networks, a PAC file is pushed out to every computer, and browser settings are also configured to enable the PAC file. But it can also be done manually. Just check your browser proxy settings to see the location of the PAC file it is pointed to.
I was wondering if it's possible to host a private vpn on heroku?
My (hypothetical) use case is that let's say there's some service that's only available in Europe but I want to access it in the USA. I'd like to turn a European heroku server into a personal vpn that just allows me to access that service.
I did some research and can't find anyone else who's tried/documented this.
You basically want a proxy. So heroku forbids running an open proxy, so you should restrict use.
XIX. Operate an “open proxy” or any other form of Internet proxy service that is capable of forwarding requests to any end user or third-party-supplied Internet host;
--https://www.heroku.com/policy/aup
But technically it is possible - you might want to try it: https://github.com/Rob--W/cors-anywhere, if you want to use the browser you will need to download the headers from the server.js file
Note that this project is not intended to be used as an open proxy, so for example relative paths are not loaded properly.
You might want to try it - it might be more appropriate, I just did not try it myself ... :)
https://github.com/http-party/node-http-proxy#setup-a-basic-stand-alone-proxy-server
Since Mozilla and Google announced, that they intend to activate DNS over HTTPS in the default settings in the future and the IETF approved officially the draft (https://datatracker.ietf.org/wg/doh/about/), I tried to understand the impact on our corporate network. It is now possible for every application to bypass the internal DNS Server (assigned via DHCP) and directly connect to a public DNS service. There is no easy way for an administrator to prevent application and users doing this, since all traffic is routed through HTTPS.
In most corporations that I know, there is a split DNS setup in place, allowing internal (intranet) and external (internet) name and IP resolution for the same domain name (e.g. mail.mycorp.example) with different resolve values. It also allows to add additional, intranet only, services like wiki.intra.mycorp.example, that would not be resolvable/accessible from the internet. Same goes for infrastructure names like server01.eq.mycorp.example.
The problem I see is, that if the application itself is preferring DNS over HTTPS and is not correctly falling back to the system assigned DNS servers, internal only domains would not be accessible.
I made an experiment with Firefox 61.0.1 (64-Bit) on Windows 10. I have set:
network.trr.bootstrapAddress = 1.1.1.1
network.trr.uri = https://mozilla.cloudflare-dns.com/dns-query
network.trr.mode = 2
network.trr.mode = 2 should prefer DNS over HTTPS, but fallback to system DNS if no value received, mode = 1, which I also tried, should make a race and use the first valid result that Firefox gets back.
Unfortunately, after activating DNS over HTTPS in Firefox, all internal only websites did no longer work. All requests end in a timeout and fail therefor.
What do I miss?
Is there a better way to handle internal only DNS entries in future setups?
The exact configuration you described works in my corporate network. It first tries DoH for internal sites, then falls back to local DNS and internal sites resolve and load correctly.
I do a lot of custom web development and I am looking for a solution to a problem with testing.
I have a local development server that I run sandboxed environments on. When I need to test something I sometimes will edit my host file to make the domain point at my local IP
In my host file I would have.
127.0.0.1 mydomainname.com
What I would rather be able to setup is if I added a port to a URL:
mydomainname.com:7777
That would then redirect to my local IP
Something like this
127.0.0.1 *:7777
Is this a pipe dream or doable in someway?
You can use Firefox Extension Server Switcher
This firefox extension is a tool for web developers and allows switching between sites on your development and live servers; it helps you to see difference immediately.
It's more easy in use than host file.
Okay, so we implement Recaptcha in production. We get errors because it can't reach the IP address it needs to use the service. We open a port for the IP address to reach Google. No problem. We do that and configure that IP address explicitly to work. It works great. Then, the next day, we start getting errors again because Recaptcha is using a different IP address. I can allow requests from that IP address, too, but now I'm unsettled. Where are these addresses coming from? How do I configure this to work reliably?
Recatpcha from Google can use any Google IP address and there are lots of them.
Ran this from Windows:
_netblocks.google.com text =
nslookup -type=TXT _netblocks.google.com
"v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all"
That's all the network Google uses currently. These can change so check them often.
Google suggest allowing port 80 to all IPs outbound, this highly insecure. They recommend going through a proxy server but again that is highly insecure if your web server is an DMZ. Proxy aware trojans do exist. All that need to be done is exploit a vulnerability to execute arbitrary code and you can create reverse connection on port 80 through a proxy server to download the payload. Then it is trivial to escalate privileges and own the box. I don't mean just Windows servers but Linux as well. I've done it in lab environment on security was on. It's really easy to do.
This is the Google website I got this from:
http://code.google.com/p/recaptcha/wiki/FirewallsAndRecaptcha
I wanted to append to this answer with more recent information. The documentation that Chris is pointing to does not include all of the TXT records necessary to dig (thanks Google):
_netblocks2.google.com (IPv6 subnets)
_netblocks3.google.com (Additional IPv4 subnets)
In my particular case, the _netblocks3 entry contained 2 large /19's that made my initial rule ineffective
(I found additional references here: https://support.google.com/a/answer/60764?hl=en)
Perhaps you should be using a hostname rather than IP