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A collection of awesome lists, manuals, blogs, hacks, one-liners and tools for Awesome Ninja Admins.

_{Created by
trimstray and

contributors}

Who is Ninja Admins?

race of pure evil who rule the network through a monarchistic feudelic system
they never opened the door for strangers (or anyone at all)
they know very nasty piece of code like a fork bombs
they can make dd is not a destroyer of disks
they know that #!/usr/bin/env bash superior to #!/bin/bash
they know that su - logs in completely as root
they miss and cry for Slackware on production
they love the old admin nix-world

☑️ Todo

Add useful shell functions
Add one-liners for collection tools (eg. CLI Tools)
Add Ninja Admins T-Shirt stickers
Generate Awesome Ninja Admins book (eg. pdf format)

Ninja Admins Collection

CLI Tools

▪️ Shells

  🔸 Oh My ZSH! - the best framework for managing your Zsh configuration.
  🔸 bash-it - framework for using, developing and maintaining shell scripts and custom commands for your daily work.
  🔸 Oh My Fish - the Fishshell framework.

▪️ Managers

  🔸 Midnight Commander - visual file manager, licensed under GNU General Public License.
  🔸 screen - full-screen window manager that multiplexes a physical terminal.
  🔸 tmux - terminal multiplexer, lets you switch easily between several programs in one terminal.

▪️ Network

  🔸 Curl - command line tool and library for transferring data with URLs.
  🔸 HTTPie - a user-friendly HTTP client.
  🔸 gnutls-cli - client program to set up a TLS connection to some other computer.
  🔸 nmap - free and open source (license) utility for network discovery and security auditing.
  🔸 hping - command-line oriented TCP/IP packet assembler/analyzer.
  🔸 masscan - the fastest Internet port scanner, spews SYN packets asynchronously.
  🔸 netcat - networking utility which reads and writes data across network connections, using the TCP/IP protocol.
  🔸 tcpdump - powerful command-line packet analyzer.
  🔸 tshark - dump and analyze network traffic (wireshark cli).
  🔸 fierce - a DNS reconnaissance tool for locating non-contiguous IP space.
  🔸 sublist3r - fast subdomains enumeration tool for penetration testers.

▪️ SSL

  🔸 sslyze - fast and powerful SSL/TLS server scanning library.
  🔸 sslscan - tests SSL/TLS enabled services to discover supported cipher suites.
  🔸 testssl.sh - testing TLS/SSL encryption anywhere on any port.

▪️ Auditing Tools

🔸 lynis - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system.

▪️ System Diagnostics/Debuggers

  🔸 strace - diagnostic, debugging and instructional userspace utility for Linux.
  🔸 sysdig - system exploration and troubleshooting tool with first class support for containers.
  🔸 lsof - displays in its output information about files that are opened by processes.
  🔸 FlameGraph - stack trace visualizer.
  🔸 lsofgraph - small utility to convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication.

▪️ Log Analyzers

🔸 GoAccess - real-time web log analyzer and interactive viewer that runs in a terminal.

▪️ Databases

  🔸 usql - universal command-line interface for SQL databases.
  🔸 pgcli - postgres CLI with autocompletion and syntax highlighting.
  🔸 mycli - terminal client for MySQL with autocompletion and syntax highlighting.

Web Tools

▪️ SSL

  🔸 SSL Server Test - free online service performs a deep analysis of the configuration of any SSL web server.
  🔸 SSL Server Test (DEV) - free online service performs a deep analysis of the configuration of any SSL web server.
  🔸 ImmuniWeb® SSLScan - test SSL/TLS (PCI DSS, HIPAA and NIST).
  🔸 Report URI - monitoring security policies like CSP and HPKP.
  🔸 CSP Evaluator - allows developers and security experts to check if a Content Security Policy.
  🔸 badssl.com - memorable site for testing clients against bad SSL configs.
  🔸 Common CA Database - repository of information about CAs, and their root and intermediate certificates.
  🔸 CERTSTREAM - real-time certificate transparency log update stream.

▪️ HTTP Headers

🔸 Security Headers - analyse the HTTP response headers (with rating system to the results).
🔸 Observatory by Mozilla - set of tools to analyze your website.

▪️ DNS

  🔸 ViewDNS - one source for free DNS related tools and information.
  🔸 DNS Spy - monitor, validate and verify your DNS configurations.
  🔸 DNSlytics - online investigation tool.

▪️ Mail

🔸 MX Toolbox - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.

▪️ Mass scanners (search engines)

  🔸 Censys - platform that helps information security practitioners discover, monitor, and analyze devices.
  🔸 Shodan - the world's first search engine for Internet-connected devices.
  🔸 GreyNoise - mass scanner (such as Shodan and Censys).

▪️ Net-tools

  🔸 Netcraft - detailed report about the site, helping you to make informed choices about their integrity.
  🔸 Security Trails - APIs for Security Companies, Researchers and Teams.
  🔸 Online Curl - curl test, analyze HTTP Response Headers.
  🔸 Ping.eu - online Ping, Traceroute, DNS lookup, WHOIS and others.
  🔸 Network-Tools - network tools for webmasters, IT technicians & geeks.
  🔸 URL Encode/Decode - tool from above to either encode or decode a string of text.
  🔸 RegExr - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
  🔸 Hardenize - deploy the security standards.

▪️ Code parsers/playgrounds

🔸 ShellCheck - finds bugs in your shell scripts.
🔸 jsbin - live pastebin for HTML, CSS & JavaScript and more.

▪️ Performance

🔸 GTmetrix - analyze your site’s speed and make it faster.
🔸 Sucuri loadtimetester - test here the performance of any of your sites from across the globe.

▪️ Passwords

  🔸 Random.org - generate random passwords.
  🔸 Gotcha? - list of 1.4 billion accounts circulates around the Internet.
  🔸 have i been pwned? - check if you have an account that has been compromised in a data breach.

Manuals/Howtos/Tutorials

▪️ Bash

🔸 pure-bash-bible - a collection of pure bash alternatives to external processes.
🔸 The Bash Hackers Wiki - hold documentation of any kind about GNU Bash.

▪️ Unix tutorials

🔸 nixCraft - linux and unix tutorials for new and seasoned sysadmin.
🔸 TecMint - the ideal Linux blog for Sysadmins & Geeks.

▪️ Hacking

🔸 Hacking Articles - LRaj Chandel's Security & Hacking Blog.

Blogs

  🔸 Brendan Gregg's Blog - Brendan Gregg is an industry expert in computing performance and cloud computing.
  🔸 Gynvael "GynDream" Coldwind - Gynvael is a IT security engineer at Google.
  🔸 Michał "lcamtuf" Zalewski - "white hat" hacker, computer security expert.
  🔸 Mattias Geniar - developer, Sysadmin, Blogger, Podcaster and Public Speaker.
  🔸 Nick Craver - Software Developer and Systems Administrator for Stack Exchange.
  🔸 Robert Penz - IT security Expert.
  🔸 Scott Helme - Security Researcher, international speaker and founder of securityheaders.com and report-uri.com.
  🔸 Kacper Szurek - Detection Engineer at ESET.
  🔸 Troy Hunt - Microsoft Regional Director and Microsoft Most Valuable Professional for Developer Security.
  🔸 Linux Audit - the Linux security blog about Auditing, Hardening and Compliance by Michael Boelen.
  🔸 Linux Security Expert - trainings, howtos, checklists, security tools and more.
  🔸 The Grymoire - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.

Systems/Services

▪️ Systems

  🔸 Slackware - the most "Unix-like" Linux distribution.
  🔸 OpenBSD - multi-platform 4.4BSD-based UNIX-like operating system.
  🔸 HardenedBSD - HardenedBSD aims to implement innovative exploit mitigation and security solutions.

▪️ HTTP(s) Services

🔸 Varnish HTTP Cache - HTTP accelerator designed for content-heavy dynamic web sites.

▪️ Security/hardening

🔸 Emerald Onion - seattle-based encrypted-transit internet service provider.
🔸 Unbound - validating, recursive, and caching DNS resolver (with TLS).

Lists

  🔸 Awesome Sysadmin - amazingly awesome open source sysadmin resources.
  🔸 Awesome Shell - awesome command-line frameworks, toolkits, guides and gizmos.
  🔸 Awesome-Hacking - awesome lists for hackers, pentesters and security researchers.
  🔸 Command-line-text-processing - from finding text to search and replace, from sorting to beautifying text and more.

Hacking/Penetration testing

▪️ Bounty programs

  🔸 Openbugbounty - allows any security researcher reporting a vulnerability on any website.
  🔸 hackerone - global hacker community to surface the most relevant security issues.
  🔸 bugcrowd - crowdsourced cybersecurity for the enterprise.
  🔸 Crowdshield - crowdsourced Security & Bug Bounty Management.

▪️ Web Training Apps

  🔸 Metasploitable 2 - vulnerable web application amongst security researchers.
  🔸 DVWA - PHP/MySQL web application that is damn vulnerable.
  🔸 OWASP Mutillidae II - free, open source, deliberately vulnerable web-application.
  🔸 OWASP Juice Shop Project - the most bug-free vulnerable application in existence.
  🔸 OWASP WebGoat Project - insecure web application maintained by OWASP designed to teach web app security.
  🔸 Security Ninjas - open source application security training program.

▪️ Labs

🔸 Hack The Box - online platform allowing you to test your penetration testing skills.

One-liners

System
- terminal
- mount
- fuser
- ps
- top
- kill
- find
- diff
- tail
- cpulimit
- pwdx
- tr
- chmod
- who
- screen
- du
- inotifywait
- openssl
- gnutls-cli
- secure-delete
- dd
HTTP/HTTPS
- curl
- httpie
Network
- ssh
- linux-dev
- tcpdump
- tcpick
- ngrep
- hping3
- netcat
- socat
- lsof
- netstat
- rsync
- host
- dig
- network-other
Programming
- awk
- sed
- grep

System

Tool: terminal

Close shell keeping all subprocess running

disown -a && exit

Exit without saving shell history

kill -9 $$
unset HISTFILE && exit

Perform a branching conditional

true && { echo success;} || { echo failed; }

Pipe stdout and stderr to separate commands

some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)

Redirect stdout and stderr each to separate files and print both to the screen

(some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog

List of commands you use most often

history | \
awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | \
grep -v "./" | \
column -c3 -s " " -t | \
sort -nr | nl |  head -n 20

Empty a file (truncate to 0 size)

>filename

Quickly backup a file

cp filename{,.orig}

Delete all files in a folder that don’t match a certain file extension

rm !(*.foo|*.bar|*.baz)

Edit a file on a remote host using vim

vim scp://user@host//etc/fstab

Create a directory and change into it at the same time

mkd () { mkdir -p "$@" && cd "$@"; }

Convert uppercase files to lowercase files

rename 'y/A-Z/a-z/' *

Print a row of characters across the terminal

printf "%`tput cols`s" | tr ' ' '#'

Show shell history without line numbers

history | cut -c 8-
fc -l -n 1 | sed 's/^\s*//'

Run command(s) after exit session

cat > /etc/profile << __EOF__
_after_logout() {

  username=$(whoami)

  for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do

    kill -9 $_pid

  done

}
trap _after_logout EXIT
__EOF__

Generate a sequence of numbers

for ((i=1; i<=10; i+=2)) ; do echo $i ; done
# alternative: seq 1 2 10

for ((i=5; i<=10; ++i)) ; do printf '%02d\n' $i ; done
# alternative: seq -w 5 10

Tool: mount

Mount a temporary ram partition

mount -t tmpfs tmpfs /mnt -o size=64M

-t - filesystem type
-o - mount options

Remount a filesystem as read/write

mount -o remount,rw /

Tool: fuser

Kills a process that is locking a file

fuser -k filename

Show what PID is listening on specific port

fuser -v 53/udp

Tool: ps

Show a 4-way scrollable process tree with full details

ps awwfux | less -S

Processes per user counter

ps hax -o user | sort | uniq -c | sort -r

Tool: find

Find files that have been modified on your system in the past 60 minutes

find / -mmin 60 -type f

Find all files larger than 20M

find / -type f -size +20M

Find duplicate files (based on MD5 hash)

find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33

Change permission only for files

cd /var/www/site && find . -type f -exec chmod 766 {} \;
cd /var/www/site && find . -type f -exec chmod 664 {} +

Change permission only for directories

cd /var/www/site && find . -type d -exec chmod g+x {} \;
cd /var/www/site && find . -type d -exec chmod g+rwx {} +

Find files and directories for specific user

find . -user <username> -print

Find files and directories for all without specific user

find . \!-user <username> -print

Delete older files than 60 days

find . -type f -mtime +60 -delete

Recursively remove all empty sub-directories from a directory

find . -depth  -type d  -empty -exec rmdir {} \;

How to find all hard links to a file

find </path/to/dir> -xdev -samefile filename

Tool: top

Use top to monitor only all processes with the specific string

top -p $(pgrep -d , <str>)

<str> - process containing str (eg. nginx, worker)

Tool: kill

Kill a process running on port

kill -9 $(lsof -i :<port> | awk '{l=$2} END {print l}')

Tool: diff

Compare two directory trees

diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)

Tool: tail

Annotate tail -f with timestamps

tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done

Analyse an Apache access log for the most common IP addresses

tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail

Analyse web server log and show only 5xx http codes

tail -n 100 -f /path/to/logfile | grep "HTTP/[1-2].[0-1]\" [5]"

Tool: tar

System backup with exclude specific directories

cd /
tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .

System backup with exclude specific directories (pigz)

cd /
tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* \
--exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .

Tool: dump

System backup to file

dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /

Restore system from lzo file

cd /
restore -rf /backup/system$(date +%d%m%Y%s).lzo

Tool: cpulimit

Limit the cpu usage of a process

cpulimit -p pid -l 50

Tool: pwdx

Show current working directory of a process

pwdx <pid>

Tool: taskset

Start a command on only one CPU core

taskset -c 0 <command>

Tool: tr

Show directories in the PATH, one per line

tr : '\n' <<<$PATH

Tool: chmod

Remove executable bit from all files in the current directory

chmod -R -x+X *

Restore permission for /bin/chmod

# 1:
cp /bin/ls chmod.01
cp /bin/chmod chmod.01
./chmod.01 700 file

# 2:
/bin/busybox chmod 0700 /bin/chmod

# 3:
setfacl --set u::rwx,g::---,o::--- /bin/chmod

Tool: who

Find last reboot time

who -b

Tool: screen

Start screen in detached mode

screen -d -m [<command>]

Tool: du

Show 20 biggest directories with ‘K M G’

du | \
sort -r -n | \
awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | \
head -n 20

Tool: inotifywait

Init tool everytime a file in a directory is modified

while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;

Tool: openssl

Testing connection to remote host

echo | openssl s_client -connect google.com:443 -showcerts

Testing connection to remote host (with SNI support)

echo | openssl s_client -showcerts -servername google.com -connect google.com:443

Testing connection to remote host with specific ssl version

openssl s_client -tls1_2 -connect google.com:443

Testing connection to remote host with specific ssl cipher

openssl s_client -cipher 'AES128-SHA' -connect google.com:443

Generate private key

# _ciph: des3, aes
( _ciph="des3" ; _fd="private.key" ; _len="2048" ; \
openssl genrsa -${_ciph} -out ${_fd} ${_len} )

Remove password from private key

( _fd="private.key" ; _fd_unp="private_unp.key" ; \
openssl rsa -in ${_fd} -out ${_fd_unp} )

Get public key from private key

( _fd="private.key" ; _fd_pub="public.key" ; \
openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )

Generate private key + csr

( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )

Generate csr

( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -out ${_fd_csr} -new -key ${_fd} )

Generate csr (metadata from exist certificate)

( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )

Generate csr with -config param

( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
-config <(
cat <<-EOF
[req]
default_bits = 2048
prompt = no
default_md = sha256
req_extensions = req_ext
distinguished_name = dn

[ dn ]
C=<two-letter ISO abbreviation for your country>
ST=<state or province where your organization is legally located>
L=<city where your organization is legally located>
O=<legal name of your organization>
OU=<section of the organization>
CN=<fully qualified domain name>

[ req_ext ]
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = <fully qualified domain name>
DNS.2 = <next domain>
DNS.3 = <next domain>
EOF
))

Convert DER to PEM

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )

Convert PEM to DER

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )

Checking whether the private key and the certificate match

(openssl rsa -noout -modulus -in private.key | openssl md5 ; openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq

Tool: gnutls-cli

Testing connection to remote host (with sni)

gnutls-cli -p 443 google.com

Testing connection to remote host (without sni)

gnutls-cli --disable-sni -p 443 google.com

Tool: secure-delete

Secure delete with shred

shred -vfuz -n 10 file
shred --verbose --random-source=/dev/urandom -n 1 /dev/sda

Secure delete with scrub

scrub -p dod /dev/sda
scrub -p dod -r file

Secure delete with badblocks

badblocks -s -w -t random -v /dev/sda
badblocks -c 10240 -s -w -t random -v /dev/sda

Secure delete with secure-delete

srm -vz /tmp/file
sfill -vz /local
sdmem -v
swapoff /dev/sda5 && sswap -vz /dev/sda5

Tool: dd

Show dd status every so often

dd <dd_params> status=progress
watch --interval 5 killall -USR1 dd

HTTP/HTTPS

Tool: curl

curl -Iks https://www.google.com

-I - show response headers only
-k - insecure connection when using ssl
-s - silent mode (not display body)

curl -Iks --location -X GET -A "x-agent" https://www.google.com

--location - follow redirects
-X - set method
-A - set user-agent

curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com

--proxy [socks5://|http://] - set proxy server

Check DNS and HTTP trace with headers for specific domains

### Set domains and external dns servers.
_domain_list=(google.com) ; _dns_list=("8.8.8.8" "1.1.1.1")

for _domain in "${_domain_list[@]}" ; do

  printf '=%.0s' {1..48}

  echo

  printf "[\\e[1;32m+\\e[m] resolve: %s\\n" "$_domain"

  for _dns in "${_dns_list[@]}" ; do

    # Resolve domain.
    host "${_domain}" "${_dns}"

    echo

  done

  for _proto in http https ; do

    printf "[\\e[1;32m+\\e[m] trace + headers: %s://%s\\n" "$_proto" "$_domain"

    # Get trace and http headers.
    curl -Iks -A "x-agent" --location "${_proto}://${_domain}"

    echo

  done

done

unset _domain_list _dns_list

Tool: httpie

http -p Hh https://www.google.com

-p - print request and response headers
- H - request headers
- B - request body
- h - response headers
- b - response body

http -p Hh --follow --max-redirects 5 --verify no https://www.google.com

-F, --follow - follow redirects
--max-redirects N - maximum for --follow
--verify no - skip SSL verification

http -p Hh --follow --max-redirects 5 --verify no --proxy http:http://127.0.0.1:16379 https://www.google.com

--proxy [http:] - set proxy server

Network

Tool: ssh

Compare a remote file with a local file

ssh user@host cat /path/to/remotefile | diff /path/to/localfile -

SSH connection through host in the middle

ssh -t reachable_host ssh unreachable_host

Run command over ssh on remote host

cat > cmd.txt << __EOF__
cat /etc/hosts
__EOF__

ssh host -l user $(<cmd.txt)

Get public key from private key

ssh-keygen -y -f ~/.ssh/id_rsa

Get all fingerprints

ssh-keygen -l -f .ssh/known_hosts

Ssh authentication with user password

ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host

Ssh authentication with publickey

ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host

Simple recording SSH session

function _ssh_sesslog() {

  _sesdir="<path/to/session/logs>"

  mkdir -p "${_sesdir}" && \
  ssh $@ 2>&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"

}

# Alias:
alias ssh='_ssh_sesslog'

Using Keychain for SSH logins

### Delete all of ssh-agent's keys.
function _scl() {

  /usr/bin/keychain --clear

}

### Add key to keychain.
function _scg() {

  /usr/bin/keychain /path/to/private-key
  source "$HOME/.keychain/$HOSTNAME-sh"

}

Tool: linux-dev

Testing remote connection to port

timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?

<proto - set protocol (tcp/udp)
<host> - set remote host
<port> - set destination port

Read and write to TCP or UDP sockets with common bash tools

exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-

Tool: tcpdump

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443

-n - don’t convert addresses
-e - print the link-level headers
-i [iface] - set interface
-Q|-D [in|out|inout] - choose send/receive direction (-D - for old tcpdump versions)
host [ip|hostname] - set host, also [host not]
[and|or] - set logic
port [1-65535] - set port number, also [port not]

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap

-c [num] - capture only num number of packets
-w [filename] - write packets to file, -r [filename] - reading from file

Tool: tcpick

Analyse packets in real-time

while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done

Tool: ngrep

ngrep -d eth0 "www.google.com" port 443

-d [iface|any] - set interface
[domain] - set hostname
port [1-65535] - set port number

ngrep -d eth0 "www.google.com" (host 10.240.20.2) and (port 443)

(host [ip|hostname]) - filter by ip or hostname
(port [1-65535]) - filter by port number

ngrep -d eth0 -qt -O ngrep.pcap "www.google.com" port 443

-q - quiet mode (only payloads)
-t - added timestamps
-O [filename] - save output to file, -I [filename] - reading from file

ngrep -d eth0 -qt 'HTTP' 'tcp'

HTTP - show http headers
tcp|udp - set protocol
[src|dst] host [ip|hostname] - set direction for specific node

ngrep -l -q -d eth0 -i "User-Agent: curl*"

-l - stdout line buffered
-i - case-insensitive search

Tool: hping3

hping3 -V -p 80 -s 5050 <scan_type> www.google.com

-V|--verbose - verbose mode
-p|--destport - set destination port
-s|--baseport - set source port
<scan_type> - set scan type
- -F|--fin - set FIN flag, port open if no reply
- -S|--syn - set SYN flag
- -P|--push - set PUSH flag
- -A|--ack - set ACK flag (use when ping is blocked, RST response back if the port is open)
- -U|--urg - set URG flag
- -Y|--ymas - set Y unused flag (0x80 - nullscan), port open if no reply
- -M 0 -UPF - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply

hping3 -V -c 1 -1 -C 8 www.google.com

-c [num] - packet count
-1 - set ICMP mode
-C|--icmptype [icmp-num] - set icmp type (default icmp-echo = 8)

hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>

--flood - sent packets as fast as possible (don’t show replies)
--rand-source - random source address mode
-d --data - data size
-w|--win - winsize (default 64)

Tool: netcat

nc -kl 5000

-l - listen for an incoming connection
-k - listening after client has disconnected
>filename.out - save receive data to file (optional)

nc 192.168.0.1 5051 < filename.in

< filename.in - send data to remote host

nc -vz 10.240.30.3 5000

-v - verbose output
-z - scan for listening daemons

nc -vzu 10.240.30.3 1-65535

-u - scan only udp ports

Transfer data file (archive)

server> nc -l 5000 | tar xzvfp -
client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000

Launch remote shell

server> nc -l 5000 -e /bin/bash
client> nc 10.240.30.3 5000

Simple file server

while true ; do nc -l 5000 | tar -xvf - ; done

Simple minimal HTTP Server

while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"' ; done

Simple HTTP Server

Restarts web server after each request - remove while condition for only single connection.

cat > index.html << __EOF__
<!doctype html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
    <body>

    <p>

      Hello! It's a site.

    </p>

    </body>
</html>
__EOF__

server> while : ; do \
(echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) | \
nc -l -p 5000 \
; done

-p - port number

Simple HTTP Proxy (single connection)

#!/usr/bin/env bash

if [[ $# != 2 ]] ; then
  printf "%s\\n" \
         "usage: ./nc-proxy listen-port bk_host:bk_port"
fi

_listen_port="$1"
_bk_host=$(echo "$2" | cut -d ":" -f1)
_bk_port=$(echo "$2" | cut -d ":" -f2)

printf "  lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
       "$_listen_port" "$_bk_host" "$_bk_port"

_tmp=$(mktemp -d)
_back="$_tmp/pipe.back"
_sent="$_tmp/pipe.sent"
_recv="$_tmp/pipe.recv"

trap 'rm -rf "$_tmp"' EXIT

mkfifo -m 0600 "$_back" "$_sent" "$_recv"

sed "s/^/=> /" <"$_sent" &
sed "s/^/<=  /" <"$_recv" &

nc -l -p "$_listen_port" <"$_back" | \
tee "$_sent" | \
nc "$_bk_host" "$_bk_port" | \
tee "$_recv" >"$_back"

server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  lport: 8080
bk_host: 192.168.252.10
bk_port: 8000

client> http -p h 10.240.30.3:8080
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=31536000
Content-Length: 2748
Content-Type: text/html; charset=utf-8
Date: Sun, 01 Jul 2018 20:12:08 GMT
Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT

Create a single-use TCP or UDP proxy

### TCP -> TCP
nc -l -p 2000 -c "nc [ip|hostname] 3000"

### TCP -> UDP
nc -l -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> UDP
nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> TCP
nc -l -u -p 2000 -c "nc [ip|hostname] 3000"

Tool: socat

Testing remote connection to port

socat - TCP4:10.240.30.3:22

- - standard input (STDIO)
TCP4:<params> - set tcp4 connection with specific params
- [hostname|ip] - set hostname/ip
- [1-65535] - set port number

Redirecting TCP-traffic to a UNIX domain socket under Linux

socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo

TCP-LISTEN:<params> - set tcp listen with specific params
- [1-65535] - set port number
- bind=[hostname|ip] - set bind hostname/ip
- reuseaddr - allows other sockets to bind to an address
- fork - keeps the parent process attempting to produce more connections
- su=nobody - set user
- range=[ip-range] - ip range
UNIX-CLIENT:<params> - communicates with the specified peer socket
- filename - define socket

Tool: lsof

Show process that use internet connection at the moment

lsof -P -i -n

Show process that use specific port number

lsof -i tcp:443

Lists all listening ports together with the PID of the associated process

lsof -Pan -i tcp -i udp

List all open ports and their owning executables

lsof -i -P | grep -i "listen"

Show all open ports

lsof -Pnl -i

Show open ports (LISTEN)

lsof -Pni4 | grep LISTEN | column -t

List all files opened by a particular command

lsof -c "process"

View user activity per directory

lsof -u username -a +D /etc

Show 10 Largest Open Files

lsof / | \
awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' | \
sort -n -u | tail | column -t

Tool: netstat

Graph # of connections for each hosts

netstat -an | \
grep ESTABLISHED | \
awk '{print $5}' | \
awk -F: '{print $1}' | \
grep -v -e '^[[:space:]]*$' | \
sort | uniq -c | \
awk '{ printf("%s\t%s\t",$2,$1) ; for (i = 0; i < $1; i++) {printf("*")}; print "" }'

Monitor open connections for specific port including listen, count and sort it per IP

watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"

Tool: rsync

Rsync remote data as root using sudo

rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/

Tool: host

Resolves the domain name (using external dns server)

host google.com 9.9.9.9

Checks the domain administrator (SOA record)

host -t soa google.com 9.9.9.9

Tool: dig

Resolves the domain name (short output)

dig google.com +short

Lookup NS record for specific domain

dig @9.9.9.9 google.com NS

Query only answer section

dig google.com +nocomments +noquestion +noauthority +noadditional +nostats

Query ALL DNS Records

dig google.com ANY +noall +answer

DNS Reverse Look-up

dig -x 172.217.16.14 +short

Tool: network-other

Get all subnets for specific AS (Autonomous system)

AS="AS32934"
whois -h whois.radb.net -- "-i origin ${AS}" | \
grep "^route:" | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]//' | \
sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]/allow /' | \
sed 's/$/;/' | \
sed 's/allow  */subnet -> /g'

Resolves domain name from dns.google.com with curl and jq

_dname="google.com" ; curl -s "https://dns.google.com/resolve?name=${_dname}&type=A" | jq .

Programming

Tool: awk

Remove duplicate entries in a file without sorting

awk '!x[$0]++' filename

Exclude multiple columns using AWK

awk '{$1=$3=""}1' filename

Tool: sed

To print a specific line from a file

sed -n 10p /path/to/file

Remove a specific line from a file

sed -i 10d /path/to/file
# alternative (BSD): sed -i'' 10d /path/to/file

Remove a range of lines from a file

sed -i <file> -re '<start>,<end>d'

Tool: grep

Search for a “pattern” inside all files in the current directory

grep -rn "pattern"
grep -RnisI "pattern" *
fgrep "pattern" * -R

Remove blank lines from a file and save output to new file

grep . filename > newfilename

Except multiple patterns

grep -vE '(error|critical|warning)' filename

Show data from file without comments

grep -v ^[[:space:]]*# filename

Show data from file without comments and new lines

egrep -v '#|^$' filename

47 KiB Czysty Wina Historia

A collection of awesome lists, manuals, blogs, hacks, one-liners and tools for Awesome Ninja Admins.

Who is Ninja Admins?

☑️ Todo

Ninja Admins Collection

CLI Tools

▪️ Shells

▪️ Managers

▪️ Network

▪️ SSL

▪️ Auditing Tools

▪️ System Diagnostics/Debuggers

▪️ Log Analyzers

▪️ Databases

Web Tools

▪️ SSL

▪️ HTTP Headers

▪️ DNS

▪️ Mail

▪️ Mass scanners (search engines)

▪️ Net-tools

▪️ Code parsers/playgrounds

▪️ Performance

▪️ Passwords

Manuals/Howtos/Tutorials

▪️ Bash

▪️ Unix tutorials

▪️ Hacking

Blogs

Systems/Services

▪️ Systems

▪️ HTTP(s) Services

▪️ Security/hardening

Lists

Hacking/Penetration testing

▪️ Bounty programs

▪️ Web Training Apps

▪️ Labs

One-liners

Table of Contents

Tool: terminal

Close shell keeping all subprocess running

Exit without saving shell history

Perform a branching conditional

Pipe stdout and stderr to separate commands

Redirect stdout and stderr each to separate files and print both to the screen

List of commands you use most often

Empty a file (truncate to 0 size)

Quickly backup a file

Delete all files in a folder that don’t match a certain file extension

Edit a file on a remote host using vim

Create a directory and change into it at the same time

Convert uppercase files to lowercase files

Print a row of characters across the terminal

Show shell history without line numbers

Run command(s) after exit session

Generate a sequence of numbers

Tool: mount

Mount a temporary ram partition

Remount a filesystem as read/write

Tool: fuser

Kills a process that is locking a file

Show what PID is listening on specific port

Tool: ps

Show a 4-way scrollable process tree with full details

Processes per user counter

Tool: find

Find files that have been modified on your system in the past 60 minutes

Find all files larger than 20M

Find duplicate files (based on MD5 hash)

Change permission only for files

Change permission only for directories

Find files and directories for specific user

Find files and directories for all without specific user

Delete older files than 60 days

Recursively remove all empty sub-directories from a directory

How to find all hard links to a file

Tool: top

Use top to monitor only all processes with the specific string

Tool: kill

47 KiB

Czysty Wina Historia