docker-onion-nmap - Scan .onion hidden services with nmap using Tor, proxychains and dnsmasq in a minimal alpine Docker container

Use nmap to scan hidden "onion" services on the Tor network. Minimal image based on alpine, using proxychains to wrap nmap. Tor and dnsmasq are run as daemons via s6, and proxychains wraps nmap to use the Tor SOCKS proxy on port 9050. Tor is also configured via DNSPort to anonymously resolve DNS requests to port 9053. dnsmasq is configured to with this localhost:9053 as an authority DNS server. Proxychains is configured to proxy DNS through the local resolver, so all DNS requests will go through Tor and applications can resolve .onion addresses.

Example:

$ docker run --rm -it milesrichardson/onion-nmap -p 80,443 facebookcorewwwi.onion
 [tor_wait] Wait for Tor to boot... (might take a while)
 [tor_wait] Done. Tor booted.
 [nmap onion] nmap -p 80,443 facebookcorewwwi.onion
 [proxychains] config file found: /etc/proxychains.conf
 [proxychains] preloading /usr/lib/libproxychains4.so
 [proxychains] DLL init: proxychains-ng 4.12
 
 Starting Nmap 7.60 ( https://nmap.org ) at 2017-10-23 16:17 UTC
 [proxychains] Dynamic chain  ...  127.0.0.1:9050  ...  facebookcorewwwi.onion:443  ...  OK
 [proxychains] Dynamic chain  ...  127.0.0.1:9050  ...  facebookcorewwwi.onion:80  ...  OK
 Nmap scan report for facebookcorewwwi.onion (224.0.0.1)
 Host is up (2.7s latency).
 
 PORT    STATE SERVICE
 80/tcp  open  http
 443/tcp open  https
 
 Nmap done: 1 IP address (1 host up) scanned in 3.58 seconds

How it works:
When the container boots, it launches Tor and dnsmasq as daemons. The tor_wait script then waits for the Tor SOCKS proxy to be up before executing your command.

Arguments:
By default, args to docker run are passed to /bin/nmap which calls nmap with args -sT -PN -n "$@" necessary for it to work over Tor (via explainshell.com).
For example, this:

docker run --rm -it milesrichardson/onion-nmap -p 80,443 facebookcorewwwi.onion

will be executed as:

proxychains4 -f /etc/proxychains.conf /usr/bin/nmap -sT -PN -n -p 80,443 facebookcorewwwi.onion

In addition to the custom script for nmap, custom wrapper scripts for curl and nc exist to wrap them in proxychains, at /bin/curl and /bin/nc. To call them, simply specify curl or nc as the first argument to docker run. For example:

docker run --rm -it milesrichardson/onion-nmap nc -z 80 facebookcorewwwi.onion

will be executed as:

proxychains4 -f /etc/proxychains.conf /usr/bin/nc -z 80 facebookcorewwwi.onion

and

docker run --rm -it milesrichardson/onion-nmap curl -I https://facebookcorewwwi.onion

will be executed as:

proxychains4 -f /etc/proxychains.conf /usr/bin/curl -I https://facebookcorewwwi.onion

If you want to call any other command, including the original /usr/bin/nmap or /usr/bin/nc or /usr/bin/curl you can specify it as the first argument to docker run, e.g.:

docker run --rm -it milesrichardson/onion-nmap /usr/bin/curl -x socks4h://localhost:9050 https://facebookcorewwwi.onion

Environment variables:
There is only one environment variable: DEBUG_LEVEL. If you set it to anything other than 0, more debugging info will be printed (specifically, the attempted to connections to Tor while waiting for it to boot). Example:

$ docker run -e DEBUG_LEVEL=1 --rm -it milesrichardson/onion-nmap -p 80,443 facebookcorewwwi.onion
 [tor_wait] Wait for Tor to boot... (might take a while)
 [tor_wait retry 0] Check socket is open on localhost:9050...
 [tor_wait retry 0] Socket OPEN on localhost:9050
 [tor_wait retry 0] Check SOCKS proxy is up on localhost:9050 (timeout 2 )...
 [tor_wait retry 0] SOCKS proxy DOWN on localhost:9050, try again...
 [tor_wait retry 1] Check socket is open on localhost:9050...
 [tor_wait retry 1] Socket OPEN on localhost:9050
 [tor_wait retry 1] Check SOCKS proxy is up on localhost:9050 (timeout 4 )...
 [tor_wait retry 1] SOCKS proxy DOWN on localhost:9050, try again...
 [tor_wait retry 2] Check socket is open on localhost:9050...
 [tor_wait retry 2] Socket OPEN on localhost:9050
 [tor_wait retry 2] Check SOCKS proxy is up on localhost:9050 (timeout 6 )...
 [tor_wait retry 2] SOCKS proxy UP on localhost:9050
 [tor_wait] Done. Tor booted.
 [nmap onion] nmap -p 80,443 facebookcorewwwi.onion
 [proxychains] config file found: /etc/proxychains.conf
 [proxychains] preloading /usr/lib/libproxychains4.so
 [proxychains] DLL init: proxychains-ng 4.12
 
 Starting Nmap 7.60 ( https://nmap.org ) at 2017-10-23 16:34 UTC
 [proxychains] Dynamic chain  ...  127.0.0.1:9050  ...  facebookcorewwwi.onion:443  ...  OK
 [proxychains] Dynamic chain  ...  127.0.0.1:9050  ...  facebookcorewwwi.onion:80  ...  OK
 Nmap scan report for facebookcorewwwi.onion (224.0.0.1)
 Host is up (2.8s latency).
 
 PORT    STATE SERVICE
 80/tcp  open  http
 443/tcp open  https
 
 Nmap done: 1 IP address (1 host up) scanned in 4.05 seconds