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Proxy Tool For HTTP/HTTPS Traffic Capture

From Binary

The installation is easy. You can download the pre-built binaries for your platform from the Releases page. Extract them using tar, move it to your $PATHand you’re ready to go.

▶ tar -xvf proxify-linux-amd64.tar
▶ mv proxify-linux-amd64 /usr/local/bin/proxify
▶ proxify -version

proxify requires go1.14+ to install successfully. Run the following command to get the repo –

From Source

▶ GO111MODULE=on go get -v github.com/projectdiscovery/proxify/cmd/proxify

From Github

▶ git clone https://github.com/projectdiscovery/proxify.git; cd proxify/cmd/proxify; go build; cp proxify /usr/local/bin; proxify -version

Usage

▶ proxify -h

This will display help for the tool. Here are all the switches it supports.

Flag	Description	Example
addr	Listen HTTP IP and Port	proxify -addr 127.0.0.1:8080
config	Config data path	proxify -config certs
cert-cache-size	Number of certificates to cache	proxify -cert-cache-size 1024
dns-addr	Listen DNS IP and Port	proxify -dns-addr ‘127.0.0.1:80’
dns-mapping	DNS A mapping	proxify -dns-mapping test.com:80
dns-resolver	Listen DNS IP and Port	proxify -dns-resolver ‘127.0.0.1:5353’
http-proxy	Upstream HTTP Proxy	proxify -http-proxy hxxp://127.0.0.1:8080
no-color	No Color in output	proxify -no-color
output	Output Folder	proxify -output logs
request-dsl	Request Filter DSL	proxify -request-dsl “contains(request,’admim’)”
request-match-replace-dsl	Request Match-Replace DSL	proxify -request-match-replace-dsl “replace(request,’false’,’true’)”
response-dsl	Response Filter DSL	proxify -response-dsl “contains(response, md5(‘test’))”
response-match-replace-dsl	Response Match-Replace DSL	proxify -response-match-replace-dsl “regex(response, ‘^authentication failed$’, ‘authentication ok’)”
silent	Silent output	proxify -silent
socks5-proxy	Upstream socks5 proxy	proxify -socks5-proxy socks5://proxy-ip:port
v	Verbose output	proxify -v
version	Current version	proxify -version

Use Upstream proxy

Open a local proxy on port 8081 and forward the traffic to burp on port 8080

▶ proxify -addr ":8081" -http-proxy http://127.0.0.1:8080

Open a local proxy on port 8080 and forward the traffic to the TOR network

▶ proxify -socks5-proxy socks5://127.0.0.1:9050

Dump all the HTTP/HTTPS traffic

Dump all the traffic into separate files with request followed by the response, as default proxify listen to http://127.0.0.0:8080. Custom address and port can be defined using addr flag.

As default, proxied request/resposed are stored in the logs folder.

▶ proxify -output db

Hostname mapping with Local DNS resolver

Proxify supports embedding DNS resolver to map hostnames to specific addresses and define an upstream dns server for any other domain name

start a local http proxy on port 8080 using an embedded dns server listening on port 53 and resolving www.google.it to 192.168.1.1, all other fqdn are forwarded upstream to 1.1.1.1

▶ proxify -dns-addr ":53" -dns-mapping "www.google.it:192.168.1.1" -dns-resolver "1.1.1.1:53"

This feature is used for example by the replay utility to hijack the connections and simulate responses. It may be useful during internal assessments with private DNS servers. Using * as domain name matches all dns requests.

Match/Filter traffic with DSL language.

If the request or response match the filters the dump is tagged with .match.txt suffix:

▶ proxify -request-dsl "contains(request,'firefox')" -response-dsl "contains(response, md5('test'))"

Match and Replace on the fly

Proxify supports modifying Requests and Responses on the fly with DSL language.

▶ proxify -request-match-replace-dsl "replace(request,'firefox','chrome')" -response-match-replace-dsl "regex(response, '^authentication failed$', 'authentication ok')"

Replay all traffic into burp

Replay all the dumped requests/responses into the destination URL (http://127.0.0.1:8080) if not specified. For this to work, it’s necessary to configure burp to use proxify as an upstream proxy, as it will take care to hijack the DNS resolutions and simulate the remote server with the dumped request. This allows having in the burp history exactly all requests/responses as if they were originally sent through it, allowing for example to perform a remote interception on the cloud, and merge all results locally within burp.

▶ replay -output "logs/"

Installing SSL Certificate

A certificate authority is generated for proxify which is stored in the folder ~/.config/proxify/ as default, manually can be specified by -config flag. The generated certificate can be imported by visiting http://proxify/cacert.crt in a browser connected to proxify.

Installation steps for the Root Certificate are similar to other proxy tools which include adding the cert to the system trusted root store.