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  1. <p align="center">
  2. <img src="https://github.com/trimstray/awesome-ninja-admins/blob/master/doc/img/awesome_ninja_admins.png"
  3. alt="Master">
  4. </p>
  5. <br>
  6. <h4 align="center">A collection of awesome lists, manuals, blogs, hacks, one-liners and tools for <b>Awesome Ninja Admins</b>.</h4>
  7. <br>
  8. <p align="center">
  9. <a href="https://github.com/trimstray/awesome-ninja-admins/tree/master">
  10. <img src="https://img.shields.io/badge/Branch-master-green.svg?longCache=true"
  11. alt="Branch">
  12. </a>
  13. <a href="https://awesome.re">
  14. <img src="https://awesome.re/badge.svg"
  15. alt="Awesome">
  16. <a href="http://www.gnu.org/licenses/">
  17. <img src="https://img.shields.io/badge/License-GNU-blue.svg?longCache=true"
  18. alt="License">
  19. </a>
  20. </p>
  21. <div align="center">
  22. <sub>Created by
  23. <a href="https://twitter.com/trimstray">trimstray</a> and
  24. <a href="https://github.com/trimstray/awesome-ninja-admins/graphs/contributors">
  25. contributors
  26. </a>
  27. </div>
  28. <br>
  29. ***
  30. ## Who is Ninja Admins?
  31. - race of pure evil who rule the network through a monarchistic feudelic system
  32. - they never opened the door for strangers (or anyone at all)
  33. - they know very nasty piece of code like a **[fork bombs](https://en.wikipedia.org/wiki/Fork_bomb)**
  34. - they can make dd is not a **[destroyer of disks](http://www.noah.org/wiki/Dd_-_Destroyer_of_Disks)**
  35. - they know that `#!/usr/bin/env bash` superior to `#!/bin/bash`
  36. - they know that `su -` logs in completely as root
  37. - they miss and cry for **[Slackware](http://www.slackware.com/)** on production
  38. - they love the old admin nix-world
  39. ## :ballot_box_with_check: Todo
  40. - [ ] Add useful shell functions
  41. - [ ] Add one-liners for collection tools (eg. CLI Tools)
  42. - [ ] Add Ninja Admins T-Shirt stickers
  43. - [ ] Generate Awesome Ninja Admins book (eg. pdf format)
  44. ## Ninja Admins Collection
  45. #### CLI Tools
  46. ##### :black_small_square: Shells
  47. <p>
  48. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ohmyz.sh/"><b>Oh My ZSH!</b></a> - the best framework for managing your Zsh configuration.<br>
  49. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/Bash-it/bash-it"><b>bash-it</b></a> - a community Bash framework.<br>
  50. </p>
  51. ##### :black_small_square: Managers
  52. <p>
  53. &nbsp;&nbsp;:small_orange_diamond: <a href="https://midnight-commander.org/"><b>Midnight Commander</b></a> - visual file manager, licensed under GNU General Public License.<br>
  54. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.gnu.org/software/screen/"><b>screen</b></a> - full-screen window manager that multiplexes a physical terminal.<br>
  55. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/tmux/tmux/wiki"><b>tmux</b></a> - terminal multiplexer, lets you switch easily between several programs in one terminal.<br>
  56. </p>
  57. ##### :black_small_square: Network
  58. <p>
  59. &nbsp;&nbsp;:small_orange_diamond: <a href="https://curl.haxx.se/"><b>Curl</b></a> - command line tool and library
  60. for transferring data with URLs.<br>
  61. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/jkbrzt/httpie"><b>HTTPie</b></a> - a user-friendly HTTP client.<br>
  62. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html"><b>gnutls-cli</b></a> - client program to set up a TLS connection to some other computer.<br>
  63. &nbsp;&nbsp;:small_orange_diamond: <a href="http://netcat.sourceforge.net/"><b>netcat</b></a> - networking utility which reads and writes data across network connections, using the TCP/IP protocol.<br>
  64. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.tcpdump.org/"><b>tcpdump</b></a> - powerful command-line packet analyzer.<br>
  65. </p>
  66. ##### :black_small_square: Databases
  67. <p>
  68. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dbcli/pgcli"><b>pgcli</b></a> - postgres CLI with autocompletion and syntax highlighting.<br>
  69. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dbcli/mycli"><b>mycli</b></a> - terminal client for MySQL with autocompletion and syntax highlighting.<br>
  70. </p>
  71. #### Web Tools
  72. ##### :black_small_square: SSL
  73. <p>
  74. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.ssllabs.com/ssltest/"><b>SSL Server Test</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
  75. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dev.ssllabs.com/ssltest/"><b>SSL Server Test (DEV)</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
  76. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.htbridge.com/ssl/"><b>ImmuniWeb® SSLScan</b></a> - test SSL/TLS (PCI DSS, HIPAA and NIST).<br>
  77. &nbsp;&nbsp;:small_orange_diamond: <a href="https://report-uri.com/home/tools"><b>Report URI</b></a> - monitoring security policies like CSP and HPKP.<br>
  78. &nbsp;&nbsp;:small_orange_diamond: <a href="https://csp-evaluator.withgoogle.com/"><b>CSP Evaluator</b></a> - allows developers and security experts to check if a Content Security Policy.<br>
  79. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ccadb.org/resources"><b>Common CA Database</b></a> - repository of information about CAs, and their root and intermediate certificates.<br>
  80. &nbsp;&nbsp;:small_orange_diamond: <a href="https://certstream.calidog.io/"><b>CERTSTREAM</b></a> - real-time certificate transparency log update stream.<br>
  81. </p>
  82. ##### :black_small_square: HTTP Headers
  83. <p>
  84. &nbsp;&nbsp;:small_orange_diamond: <a href="https://securityheaders.com/"><b>Security Headers</b></a> - analyse the HTTP response headers (with rating system to the results).<br>
  85. &nbsp;&nbsp;:small_orange_diamond: <a href="https://observatory.mozilla.org/"><b>Observatory by Mozilla</b></a> - set of tools to analyze your website.<br>
  86. </p>
  87. ##### :black_small_square: DNS
  88. <p>
  89. &nbsp;&nbsp;:small_orange_diamond: <a href="http://viewdns.info/"><b>ViewDNS</b></a> - one source for free DNS related tools and information.<br>
  90. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dnsspy.io/"><b>DNS Spy</b></a> - monitor, validate and verify your DNS configurations.<br>
  91. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dnslytics.com/"><b>DNSlytics</b></a> - online investigation tool.<br>
  92. </p>
  93. ##### :black_small_square: Mail
  94. <p>
  95. &nbsp;&nbsp;:small_orange_diamond: <a href="https://mxtoolbox.com/SuperTool.aspx"><b>MX Toolbox</b></a> - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.<br>
  96. </p>
  97. ##### :black_small_square: Mass scanners (search engines)
  98. <p>
  99. &nbsp;&nbsp;:small_orange_diamond: <a href="https://censys.io/"><b>Censys</b></a> - platform that helps information security practitioners discover, monitor, and analyze devices.<br>
  100. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.shodan.io/"><b>Shodan</b></a> - the world's first search engine for Internet-connected devices.<br>
  101. &nbsp;&nbsp;:small_orange_diamond: <a href="https://viz.greynoise.io/table"><b>GreyNoise</b></a> - mass scanner (such as Shodan and Censys).<br>
  102. </p>
  103. ##### :black_small_square: Net-tools
  104. <p>
  105. &nbsp;&nbsp;:small_orange_diamond: <a href="https://toolbar.netcraft.com/site_report"><b>Netcraft</b></a> - detailed report about the site, helping you to make informed choices about their integrity.<br>
  106. &nbsp;&nbsp;:small_orange_diamond: <a href="https://securitytrails.com/"><b>Security Trails</b></a> - APIs for Security Companies, Researchers and Teams.<br>
  107. &nbsp;&nbsp;:small_orange_diamond: <a href="https://tools.keycdn.com/curl"><b>Online Curl</b></a> - curl test, analyze HTTP Response Headers.<br>
  108. &nbsp;&nbsp;:small_orange_diamond: <a href="http://ping.eu/"><b>Ping.eu</b></a> - online Ping, Traceroute, DNS lookup, WHOIS and others.<br>
  109. &nbsp;&nbsp;:small_orange_diamond: <a href="https://network-tools.com/"><b>Network-Tools</b></a> - network tools for webmasters, IT technicians & geeks.<br>
  110. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.url-encode-decode.com/"><b>URL Encode/Decode</b></a> - tool from above to either encode or decode a string of text.<br>
  111. &nbsp;&nbsp;:small_orange_diamond: <a href="https://regexr.com/"><b>RegExr</b></a> - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).<br>
  112. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.hardenize.com/"><b>Hardenize</b></a> - deploy the security standards.<br>
  113. </p>
  114. ##### :black_small_square: Code parsers/playgrounds
  115. <p>
  116. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.shellcheck.net/"><b>ShellCheck</b></a> - finds bugs in your shell scripts.<br>
  117. &nbsp;&nbsp;:small_orange_diamond: <a href="https://jsbin.com/?html,output"><b>jsbin</b></a> - live pastebin for HTML, CSS & JavaScript and more.<br>
  118. </p>
  119. ##### :black_small_square: Performance
  120. <p>
  121. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gtmetrix.com/"><b>GTmetrix</b></a> - analyze your site’s speed and make it faster.<br>
  122. &nbsp;&nbsp;:small_orange_diamond: <a href="https://performance.sucuri.net/"><b>Sucuri loadtimetester</b></a> - test here the
  123. performance of any of your sites from across the globe.<br>
  124. </p>
  125. ##### :black_small_square: Passwords
  126. <p>
  127. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.random.org/passwords/"><b>Random.org</b></a> - generate random passwords.<br>
  128. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gotcha.pw/"><b>Gotcha?</b></a> - list of 1.4 billion accounts circulates around the Internet.<br>
  129. &nbsp;&nbsp;:small_orange_diamond: <a href="https://haveibeenpwned.com/"><b>have i been pwned?</b></a> - check if you have an account that has been compromised in a data breach.<br>
  130. </p>
  131. #### Manuals/Howtos/Tutorials
  132. ##### :black_small_square: Bash
  133. <p>
  134. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dylanaraps/pure-bash-bible"><b>pure-bash-bible</b></a> - a collection of pure bash alternatives to external processes.<br>
  135. &nbsp;&nbsp;:small_orange_diamond: <a href="http://wiki.bash-hackers.org/start"><b>The Bash Hackers Wiki</b></a> - hold documentation of any kind about GNU Bash.<br>
  136. </p>
  137. ##### :black_small_square: Unix tutorials
  138. <p>
  139. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.cyberciti.biz/"><b>nixCraft</b></a> - linux and unix tutorials for new and seasoned sysadmin.<br>
  140. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.tecmint.com/"><b>TecMint</b></a> - the ideal Linux blog for Sysadmins & Geeks.<br>
  141. </p>
  142. ##### :black_small_square: Hacking
  143. <p>
  144. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.hackingarticles.in/"><b>Hacking Articles</b></a> - LRaj Chandel's Security & Hacking Blog.<br>
  145. </p>
  146. #### Blogs
  147. <p>
  148. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.brendangregg.com/"><b>Brendan Gregg's Blog</b></a> - Brendan Gregg is an industry expert in computing performance and cloud computing.<br>
  149. &nbsp;&nbsp;:small_orange_diamond: <a href="http://gynvael.coldwind.pl/"><b>Gynvael "GynDream" Coldwind</b></a> - Gynvael is a IT security engineer at Google.<br>
  150. &nbsp;&nbsp;:small_orange_diamond: <a href="http://lcamtuf.coredump.cx/"><b>Michał "lcamtuf" Zalewski</b></a> - "white hat" hacker, computer security expert.<br>
  151. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ma.ttias.be/"><b>Mattias Geniar</b></a> - developer, Sysadmin, Blogger, Podcaster and Public Speaker.<br>
  152. &nbsp;&nbsp;:small_orange_diamond: <a href="https://nickcraver.com/"><b>Nick Craver</b></a> - Software Developer and Systems Administrator for Stack Exchange.<br>
  153. &nbsp;&nbsp;:small_orange_diamond: <a href="https://robert.penz.name/"><b>Robert Penz</b></a> - IT security Expert.<br>
  154. &nbsp;&nbsp;:small_orange_diamond: <a href="https://scotthelme.co.uk/"><b>Scott Helme</b></a> - Security Researcher, international speaker and founder of securityheaders.com and report-uri.com.<br>
  155. &nbsp;&nbsp;:small_orange_diamond: <a href="https://security.szurek.pl/"><b>Kacper Szurek</b></a> - Detection Engineer at ESET.<br>
  156. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.troyhunt.com/"><b>Troy Hunt</b></a> - Microsoft Regional Director and Microsoft Most Valuable Professional for Developer Security.<br>
  157. &nbsp;&nbsp;:small_orange_diamond: <a href="https://linux-audit.com/"><b>Linux Audit</b></a> - the Linux security blog about Auditing, Hardening, and Compliance by Michael Boelen.<br>
  158. &nbsp;&nbsp;:small_orange_diamond: <a href="https://linuxsecurity.expert/"><b>
  159. Linux Security Expert</b></a> - the Linux security, trainings, howtos, checklists, security tools and more.<br>
  160. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.grymoire.com/"><b>The Grymoire</b></a> - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.<br>
  161. </p>
  162. #### Systems/Services
  163. ##### :black_small_square: Systems
  164. <p>
  165. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.slackware.com/"><b>Slackware</b></a> - the most "Unix-like" Linux distribution.<br>
  166. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.openbsd.org/"><b>OpenBSD</b></a> - multi-platform 4.4BSD-based UNIX-like operating system.<br>
  167. &nbsp;&nbsp;:small_orange_diamond: <a href="https://hardenedbsd.org/"><b>HardenedBSD</b></a> - HardenedBSD aims to implement innovative exploit mitigation and security solutions.<br>
  168. </p>
  169. ##### :black_small_square: HTTP(s) Services
  170. <p>
  171. &nbsp;&nbsp;:small_orange_diamond: <a href="https://varnish-cache.org/"><b>Varnish HTTP Cache</b></a> - HTTP accelerator designed for content-heavy dynamic web sites.<br>
  172. </p>
  173. ##### :black_small_square: Security/hardening
  174. <p>
  175. &nbsp;&nbsp;:small_orange_diamond: <a href="https://emeraldonion.org/"><b>Emerald Onion</b></a> - seattle-based encrypted-transit internet service provider.<br>
  176. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.unbound.net/"><b>Unbound</b></a> - validating, recursive, and caching DNS resolver (with TLS).<br>
  177. </p>
  178. #### Lists
  179. <p>
  180. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/kahun/awesome-sysadmin"><b>Awesome Sysadmin</b></a> - amazingly awesome open source sysadmin resources.<br>
  181. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/alebcay/awesome-shell"><b>Awesome Shell</b></a> - awesome command-line frameworks, toolkits, guides and gizmos.<br>
  182. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/Hack-with-Github/Awesome-Hacking"><b>Awesome-Hacking</b></a> - awesome lists for hackers, pentesters and security researchers.<br>
  183. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/learnbyexample/Command-line-text-processing"><b>Command-line-text-processing</b></a> - from finding text to search and replace, from sorting to beautifying text and more.<br>
  184. </p>
  185. #### Hacking/Penetration testing
  186. ##### :black_small_square: Bounty programs
  187. <p>
  188. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.openbugbounty.org/"><b>Openbugbounty</b></a> - allows any security researcher reporting a vulnerability on any website.<br>
  189. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.hackerone.com/"><b>hackerone</b></a> - global hacker community to surface the most relevant security issues.<br>
  190. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.bugcrowd.com/"><b>bugcrowd</b></a> - crowdsourced cybersecurity for the enterprise.<br>
  191. &nbsp;&nbsp;:small_orange_diamond: <a href="https://crowdshield.com/"><b>Crowdshield</b></a> - crowdsourced Security & Bug Bounty Management.<br>
  192. </p>
  193. ##### :black_small_square: Web Training Apps
  194. <p>
  195. &nbsp;&nbsp;:small_orange_diamond: <a href="https://metasploit.help.rapid7.com/docs/metasploitable-2"><b>Metasploitable 2</b></a> - vulnerable web application amongst security researchers.<br>
  196. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.dvwa.co.uk/"><b>DVWA</b></a> - PHP/MySQL web application that is damn vulnerable.<br>
  197. &nbsp;&nbsp;:small_orange_diamond: <a href="https://sourceforge.net/projects/mutillidae/"><b>OWASP Mutillidae II</b></a> - free, open source, deliberately vulnerable web-application.<br>
  198. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.owasp.org/index.php/OWASP_Juice_Shop_Project"><b>OWASP Juice Shop Project</b></a> - the most bug-free vulnerable application in existence.<br>
  199. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.owasp.org/index.php/Category:OWASP_WebGoat_Project"><b>OWASP WebGoat Project</b></a> - insecure web application maintained by OWASP designed to teach web app security.<br>
  200. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/opendns/Security_Ninjas_AppSec_Training"><b>Security Ninjas</b></a> - open source application security training program.<br>
  201. </p>
  202. #### One-liners
  203. ##### Table of Contents
  204. - **[System](#system)**
  205. * [terminal](#tool-terminal)
  206. * [mount](#tool-mount)
  207. * [fuser](#tool-fuser)
  208. * [ps](#tool-ps)
  209. * [top](#tool-top)
  210. * [kill](#tool-kill)
  211. * [find](#tool-find)
  212. * [diff](#tool-diff)
  213. * [tail](#tool-tail)
  214. * [cpulimit](#tool-cpulimit)
  215. * [pwdx](#tool-pwdx)
  216. * [tr](#tool-tr)
  217. * [chmod](#tool-chmod)
  218. * [who](#tool-who)
  219. * [screen](#tool-screen)
  220. * [du](#tool-du)
  221. * [inotifywait](#tool-inotifywait)
  222. * [openssl](#tool-openssl)
  223. * [gnutls](#tool-gnutls)
  224. * [secure-delete](#tool-secure-delete)
  225. * [dd](#tool-dd)
  226. - **[HTTP/HTTPS](#http-https)**
  227. * [curl](#tool-curl)
  228. * [httpie](#tool-httpie)
  229. - **[Network](#network)**
  230. * [ssh](#tool-ssh)
  231. * [linux-dev](#tool-linux-dev)
  232. * [tcpdump](#tool-tcpdump)
  233. * [tcpick](#tool-tcpick)
  234. * [ngrep](#tool-ngrep)
  235. * [hping3](#tool-hping3)
  236. * [netcat](#tool-netcat)
  237. * [socat](#tool-socat)
  238. * [lsof](#tool-lsof)
  239. * [netstat](#tool-netstat)
  240. * [rsync](#tool-rsync)
  241. * [host](#tool-host)
  242. * [dig](#tool-dig)
  243. * [dns-other](#tool-dns-other)
  244. - **[Programming](#programming)**
  245. * [awk](#tool-awk)
  246. * [sed](#tool-sed)
  247. * [grep](#tool-grep)
  248. <a name="system"><b>System</b></a>
  249. ##### Tool: [terminal](https://en.wikipedia.org/wiki/Linux_console)
  250. ###### Close shell keeping all subprocess running
  251. ```bash
  252. disown -a && exit
  253. ```
  254. ###### Exit without saving shell history
  255. ```bash
  256. kill -9 $$
  257. unset HISTFILE && exit
  258. ```
  259. ###### Perform a branching conditional
  260. ```bash
  261. true && { echo success;} || { echo failed; }
  262. ```
  263. ###### Pipe stdout and stderr to separate commands
  264. ```bash
  265. some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
  266. ```
  267. ###### Redirect stdout and stderr each to separate files and print both to the screen
  268. ```bash
  269. (some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog
  270. ```
  271. ###### List of commands you use most often
  272. ```bash
  273. history | awk '{ a[$2]++ } END { for(i in a) { print a[i] " " i } }' | sort -rn | head
  274. ```
  275. ###### Empty a file (truncate to 0 size)
  276. ```bash
  277. >filename
  278. ```
  279. ###### Quickly backup a file
  280. ```bash
  281. cp filename{,.orig}
  282. ```
  283. ###### Delete all files in a folder that don't match a certain file extension
  284. ```bash
  285. rm !(*.foo|*.bar|*.baz)
  286. ```
  287. ###### Edit a file on a remote host using vim
  288. ```bash
  289. vim scp://user@host//etc/fstab
  290. ```
  291. ###### Create a directory and change into it at the same time
  292. ```bash
  293. mkd () { mkdir -p "$@" && cd "$@"; }
  294. ```
  295. ###### Convert uppercase files to lowercase files
  296. ```bash
  297. rename 'y/A-Z/a-z/' *
  298. ```
  299. ###### Print a row of characters across the terminal
  300. ```bash
  301. printf "%`tput cols`s" | tr ' ' '#'
  302. ```
  303. ###### Show shell history without line numbers
  304. ```bash
  305. history | cut -c 8-
  306. fc -l -n 1 | sed 's/^\s*//'
  307. ```
  308. ###### Run command(s) after exit session
  309. ```bash
  310. cat > /etc/profile << __EOF__
  311. _after_logout() {
  312. username=$(whoami)
  313. for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do
  314. kill -9 $_pid
  315. done
  316. }
  317. trap _after_logout EXIT
  318. __EOF__
  319. ```
  320. ###### Generate a sequence of numbers
  321. ```bash
  322. for ((i=1; i<=10; i+=2)) ; do echo $i ; done
  323. # alternative: seq 1 2 10
  324. for ((i=5; i<=10; ++i)) ; do printf '%02d\n' $i ; done
  325. # alternative: seq -w 5 10
  326. ```
  327. ___
  328. ##### Tool: [mount](https://en.wikipedia.org/wiki/Mount_(Unix))
  329. ###### Mount a temporary ram partition
  330. ```bash
  331. mount -t tmpfs tmpfs /mnt -o size=64M
  332. ```
  333. * `-t` - filesystem type
  334. * `-o` - mount options
  335. ___
  336. ##### Tool: [fuser](https://en.wikipedia.org/wiki/Fuser_(Unix))
  337. ###### Kills a process that is locking a file
  338. ```bash
  339. fuser -k filename
  340. ```
  341. ###### Show what PID is listening on specific port
  342. ```bash
  343. fuser -v 53/udp
  344. ```
  345. ___
  346. ##### Tool: [ps](https://en.wikipedia.org/wiki/Ps_(Unix))
  347. ###### Show a 4-way scrollable process tree with full details
  348. ```bash
  349. ps awwfux | less -S
  350. ```
  351. ###### Processes per user counter
  352. ```bash
  353. ps hax -o user | sort | uniq -c | sort -r
  354. ```
  355. ___
  356. ##### Tool: [find](https://en.wikipedia.org/wiki/Find_(Unix))
  357. ###### Find files that have been modified on your system in the past 60 minutes
  358. ```bash
  359. find / -mmin 60 -type f
  360. ```
  361. ###### Find all files larger than 20M
  362. ```bash
  363. find / -type f -size +20M
  364. ```
  365. ###### Find duplicate files (based on MD5 hash)
  366. ```bash
  367. find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33
  368. ```
  369. ###### Change permission only for files
  370. ```bash
  371. cd /var/www/site && find . -type f -exec chmod 766 {} \;
  372. cd /var/www/site && find . -type f -exec chmod 664 {} +
  373. ```
  374. ###### Change permission only for directories
  375. ```bash
  376. cd /var/www/site && find . -type d -exec chmod g+x {} \;
  377. cd /var/www/site && find . -type d -exec chmod g+rwx {} +
  378. ```
  379. ###### Find files and directories for specific user
  380. ```bash
  381. find . -user <username> -print
  382. ```
  383. ###### Find files and directories for all without specific user
  384. ```bash
  385. find . \!-user <username> -print
  386. ```
  387. ###### Delete older files than 60 days
  388. ```bash
  389. find . -type f -mtime +60 -delete
  390. ```
  391. ###### Recursively remove all empty sub-directories from a directory
  392. ```bash
  393. find . -depth -type d -empty -exec rmdir {} \;
  394. ```
  395. ###### How to find all hard links to a file
  396. ```bash
  397. find </path/to/dir> -xdev -samefile filename
  398. ```
  399. ___
  400. ##### Tool: [top](https://en.wikipedia.org/wiki/Top_(software))
  401. ###### Use top to monitor only all processes with the specific string
  402. ```bash
  403. top -p $(pgrep -d , <str>)
  404. ```
  405. * `<str>` - process containing str (eg. nginx, worker)
  406. ___
  407. ##### Tool: [kill](https://en.wikipedia.org/wiki/Kill_(command))
  408. ###### Kill a process running on port
  409. ```bash
  410. kill -9 $(lsof -i :<port> | awk '{l=$2} END {print l}')
  411. ```
  412. ___
  413. ##### Tool: [diff](https://en.wikipedia.org/wiki/Diff)
  414. ###### Compare two directory trees
  415. ```bash
  416. diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)
  417. ```
  418. ___
  419. ##### Tool: [tail](https://en.wikipedia.org/wiki/Tail_(Unix))
  420. ###### Annotate tail -f with timestamps
  421. ```bash
  422. tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done
  423. ```
  424. ###### Analyse an Apache access log for the most common IP addresses
  425. ```bash
  426. tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail
  427. ```
  428. ___
  429. ##### Tool: [tar](https://en.wikipedia.org/wiki/Tar_(computing))
  430. ###### System backup with exclude specific directories
  431. ```bash
  432. cd /
  433. tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
  434. --exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .
  435. ```
  436. ###### System backup with exclude specific directories (pigz)
  437. ```bash
  438. cd /
  439. tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
  440. --exclude=proc/* --exclude=sys/* --exclude=dev/* \
  441. --exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .
  442. ```
  443. ___
  444. ##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))
  445. ###### System backup to file
  446. ```bash
  447. dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /
  448. ```
  449. ###### Restore system from lzo file
  450. ```bash
  451. cd /
  452. restore -rf /backup/system$(date +%d%m%Y%s).lzo
  453. ```
  454. ___
  455. ##### Tool: [cpulimit](http://cpulimit.sourceforge.net/)
  456. ###### Limit the cpu usage of a process
  457. ```bash
  458. cpulimit -p pid -l 50
  459. ```
  460. ___
  461. ##### Tool: [pwdx](https://www.cyberciti.biz/faq/unix-linux-pwdx-command-examples-usage-syntax/)
  462. ###### Show current working directory of a process
  463. ```bash
  464. pwdx <pid>
  465. ```
  466. ___
  467. ##### Tool: [taskset](https://www.cyberciti.biz/faq/taskset-cpu-affinity-command/)
  468. ###### Start a command on only one CPU core
  469. ```bash
  470. taskset -c 0 <command>
  471. ```
  472. ___
  473. ##### Tool: [tr](https://en.wikipedia.org/wiki/Tr_(Unix))
  474. ###### Show directories in the PATH, one per line
  475. ```bash
  476. tr : '\n' <<<$PATH
  477. ```
  478. ___
  479. ##### Tool: [chmod](https://en.wikipedia.org/wiki/Chmod)
  480. ###### Remove executable bit from all files in the current directory
  481. ```bash
  482. chmod -R -x+X *
  483. ```
  484. ###### Restore permission for /bin/chmod
  485. ```bash
  486. # 1:
  487. cp /bin/ls chmod.01
  488. cp /bin/chmod chmod.01
  489. ./chmod.01 700 file
  490. # 2:
  491. /bin/busybox chmod 0700 /bin/chmod
  492. # 3:
  493. setfacl --set u::rwx,g::---,o::--- /bin/chmod
  494. ```
  495. ___
  496. ##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))
  497. ###### Find last reboot time
  498. ```bash
  499. who -b
  500. ```
  501. ___
  502. ##### Tool: [screen](https://en.wikipedia.org/wiki/GNU_Screen)
  503. ###### Start screen in detached mode
  504. ```bash
  505. screen -d -m [<command>]
  506. ```
  507. ___
  508. ##### Tool: [du](https://en.wikipedia.org/wiki/GNU_Screen)
  509. ###### Show 20 biggest directories with 'K M G'
  510. ```bash
  511. du | sort -r -n | awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | head -n 20
  512. ```
  513. ___
  514. ##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)
  515. ###### Init tool everytime a file in a directory is modified
  516. ```bash
  517. while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;
  518. ```
  519. ___
  520. ##### Tool: [openssl](https://www.openssl.org/)
  521. ###### Testing connection to remote host
  522. ```bash
  523. echo | openssl s_client -connect google.com:443 -showcerts
  524. ```
  525. ###### Testing connection to remote host with specific ssl version
  526. ```bash
  527. openssl s_client -tls1_2 -connect google.com:443
  528. ```
  529. ###### Testing connection to remote host with specific ssl cipher
  530. ```bash
  531. openssl s_client -cipher 'AES128-SHA' -connect google.com:443
  532. ```
  533. ###### Generate private key
  534. ```bash
  535. # _ciph: des3, aes
  536. ( _ciph="des3" ; _fd="private.key" ; _len="2048" ; \
  537. openssl genrsa -${_ciph} -out ${_fd} ${_len} )
  538. ```
  539. ###### Remove password from private key
  540. ```bash
  541. ( _fd="private.key" ; _fd_unp="private_unp.key" ; \
  542. openssl rsa -in ${_fd} -out ${_fd_unp} )
  543. ```
  544. ###### Get public key from private key
  545. ```bash
  546. ( _fd="private.key" ; _fd_pub="public.key" ; \
  547. openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )
  548. ```
  549. ###### Generate private key + csr
  550. ```bash
  551. ( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
  552. openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )
  553. ```
  554. ###### Generate csr
  555. ```bash
  556. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  557. openssl req -out ${_fd_csr} -new -key ${_fd} )
  558. ```
  559. ###### Generate csr (metadata from exist certificate)
  560. ```bash
  561. ( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
  562. openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )
  563. ```
  564. ###### Generate csr with -config param
  565. ```bash
  566. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  567. openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
  568. -config <(
  569. cat <<-EOF
  570. [req]
  571. default_bits = 2048
  572. prompt = no
  573. default_md = sha256
  574. req_extensions = req_ext
  575. distinguished_name = dn
  576. [ dn ]
  577. C=<two-letter ISO abbreviation for your country>
  578. ST=<state or province where your organization is legally located>
  579. L=<city where your organization is legally located>
  580. O=<legal name of your organization>
  581. OU=<section of the organization>
  582. CN=<fully qualified domain name>
  583. [ req_ext ]
  584. subjectAltName = @alt_names
  585. [ alt_names ]
  586. DNS.1 = <fully qualified domain name>
  587. DNS.2 = <next domain>
  588. DNS.3 = <next domain>
  589. EOF
  590. ))
  591. ```
  592. ###### Convert DER to PEM
  593. ```bash
  594. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  595. openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )
  596. ```
  597. ###### Convert PEM to DER
  598. ```bash
  599. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  600. openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )
  601. ```
  602. ###### Checking whether the private key and the certificate match
  603. ```bash
  604. (openssl rsa -noout -modulus -in private.key | openssl md5 ; openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq
  605. ```
  606. ___
  607. ##### Tool: [gnutls-cli](https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html)
  608. ###### Testing connection to remote host (with sni)
  609. ```bash
  610. gnutls-cli -p 443 google.com
  611. ```
  612. ###### Testing connection to remote host (without sni)
  613. ```bash
  614. gnutls-cli --disable-sni -p 443 google.com
  615. ```
  616. ___
  617. ##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)
  618. ###### Secure delete with shred
  619. ```bash
  620. shred -vfuz -n 10 file
  621. shred --verbose --random-source=/dev/urandom -n 1 /dev/sda
  622. ```
  623. ###### Secure delete with scrub
  624. ```bash
  625. scrub -p dod /dev/sda
  626. scrub -p dod -r file
  627. ```
  628. ###### Secure delete with badblocks
  629. ```bash
  630. badblocks -s -w -t random -v /dev/sda
  631. badblocks -c 10240 -s -w -t random -v /dev/sda
  632. ```
  633. ###### Secure delete with secure-delete
  634. ```bash
  635. srm -vz /tmp/file
  636. sfill -vz /local
  637. sdmem -v
  638. swapoff /dev/sda5 && sswap -vz /dev/sda5
  639. ```
  640. ___
  641. ##### Tool: [dd](https://en.wikipedia.org/wiki/Dd_(Unix))
  642. ###### Show dd status every so often
  643. ```bash
  644. dd <dd_params> status=progress
  645. watch --interval 5 killall -USR1 dd
  646. ```
  647. <a name="http-https"><b>HTTP/HTTPS</b></a>
  648. ##### Tool: [curl](https://curl.haxx.se)
  649. ```bash
  650. curl -Iks https://www.google.com
  651. ```
  652. * `-I` - show response headers only
  653. * `-k` - insecure connection when using ssl
  654. * `-s` - silent mode (not display body)
  655. ```bash
  656. curl -Iks --location -X GET -A "x-agent" https://www.google.com
  657. ```
  658. * `--location` - follow redirects
  659. * `-X` - set method
  660. * `-A` - set user-agent
  661. ```bash
  662. curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com
  663. ```
  664. * `--proxy [socks5://|http://]` - set proxy server
  665. ___
  666. ##### Tool: [httpie](https://httpie.org/)
  667. ```bash
  668. http -p Hh https://www.google.com
  669. ```
  670. * `-p` - print request and response headers
  671. * `H` - request headers
  672. * `B` - request body
  673. * `h` - response headers
  674. * `b` - response body
  675. ```bash
  676. http -p Hh --follow --max-redirects 5 --verify no https://www.google.com
  677. ```
  678. * `-F, --follow` - follow redirects
  679. * `--max-redirects N` - maximum for `--follow`
  680. * `--verify no` - skip SSL verification
  681. ```bash
  682. http -p Hh --follow --max-redirects 5 --verify no --proxy http:http://127.0.0.1:16379 https://www.google.com
  683. ```
  684. * `--proxy [http:]` - set proxy server
  685. <a name="network"><b>Network</b></a>
  686. ##### Tool: [ssh](https://www.openssh.com/)
  687. ###### Compare a remote file with a local file
  688. ```bash
  689. ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
  690. ```
  691. ###### SSH connection through host in the middle
  692. ```bash
  693. ssh -t reachable_host ssh unreachable_host
  694. ```
  695. ###### Run command over ssh on remote host
  696. ```bash
  697. cat > cmd.txt << __EOF__
  698. cat /etc/hosts
  699. __EOF__
  700. ssh host -l user $(<cmd.txt)
  701. ```
  702. ###### Get public key from private key
  703. ```bash
  704. ssh-keygen -y -f ~/.ssh/id_rsa
  705. ```
  706. ###### Get all fingerprints
  707. ```bash
  708. ssh-keygen -l -f .ssh/known_hosts
  709. ```
  710. ###### Ssh authentication with user password
  711. ```bash
  712. ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host
  713. ```
  714. ###### Ssh authentication with publickey
  715. ```bash
  716. ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
  717. ```
  718. ###### Simple recording SSH session
  719. ```bash
  720. function _ssh_sesslog() {
  721. _sesdir="<path/to/session/logs>"
  722. mkdir -p "${_sesdir}" && \
  723. ssh $@ 2>&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"
  724. }
  725. # Alias:
  726. alias ssh='_ssh_sesslog'
  727. ```
  728. ___
  729. ##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)
  730. ###### Testing remote connection to port
  731. ```bash
  732. timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?
  733. ```
  734. * `<proto` - set protocol (tcp/udp)
  735. * `<host>` - set remote host
  736. * `<port>` - set destination port
  737. ###### Read and write to TCP or UDP sockets with common bash tools
  738. ```bash
  739. exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-
  740. ```
  741. ___
  742. ##### Tool: [tcpdump](http://www.tcpdump.org/)
  743. ```bash
  744. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443
  745. ```
  746. * `-n` - don't convert addresses
  747. * `-e` - print the link-level headers
  748. * `-i [iface]` - set interface
  749. * `-Q|-D [in|out|inout]` - choose send/receive direction (`-D` - for old tcpdump versions)
  750. * `host [ip|hostname]` - set host, also `[host not]`
  751. * `[and|or]` - set logic
  752. * `port [1-65535]` - set port number, also `[port not]`
  753. ```bash
  754. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap
  755. ```
  756. * `-c [num]` - capture only num number of packets
  757. * `-w [filename]` - write packets to file, `-r [filename]` - reading from file
  758. ___
  759. ##### Tool: [tcpick](http://tcpick.sourceforge.net/)
  760. ###### Analyse packets in real-time
  761. ```bash
  762. while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done
  763. ```
  764. ___
  765. ##### Tool: [ngrep](http://ngrep.sourceforge.net/usage.html)
  766. ```bash
  767. ngrep -d eth0 "www.google.com" port 443
  768. ```
  769. * `-d [iface|any]` - set interface
  770. * `[domain]` - set hostname
  771. * `port [1-65535]` - set port number
  772. ```bash
  773. ngrep -d eth0 "www.google.com" (host 10.240.20.2) and (port 443)
  774. ```
  775. * `(host [ip|hostname])` - filter by ip or hostname
  776. * `(port [1-65535])` - filter by port number
  777. ```bash
  778. ngrep -d eth0 -qt -O ngrep.pcap "www.google.com" port 443
  779. ```
  780. * `-q` - quiet mode (only payloads)
  781. * `-t` - added timestamps
  782. * `-O [filename]` - save output to file, `-I [filename]` - reading from file
  783. ```bash
  784. ngrep -d eth0 -qt 'HTTP' 'tcp'
  785. ```
  786. * `HTTP` - show http headers
  787. * `tcp|udp` - set protocol
  788. * `[src|dst] host [ip|hostname]` - set direction for specific node
  789. ```bash
  790. ngrep -l -q -d eth0 -i "User-Agent: curl*"
  791. ```
  792. * `-l` - stdout line buffered
  793. * `-i` - case-insensitive search
  794. ___
  795. ##### Tool: [hping3](http://www.hping.org/)
  796. ```bash
  797. hping3 -V -p 80 -s 5050 <scan_type> www.google.com
  798. ```
  799. * `-V|--verbose` - verbose mode
  800. * `-p|--destport` - set destination port
  801. * `-s|--baseport` - set source port
  802. * `<scan_type>` - set scan type
  803. * `-F|--fin` - set FIN flag, port open if no reply
  804. * `-S|--syn` - set SYN flag
  805. * `-P|--push` - set PUSH flag
  806. * `-A|--ack` - set ACK flag (use when ping is blocked, RST response back if the port is open)
  807. * `-U|--urg` - set URG flag
  808. * `-Y|--ymas` - set Y unused flag (0x80 - nullscan), port open if no reply
  809. * `-M 0 -UPF` - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply
  810. ```bash
  811. hping3 -V -c 1 -1 -C 8 www.google.com
  812. ```
  813. * `-c [num]` - packet count
  814. * `-1` - set ICMP mode
  815. * `-C|--icmptype [icmp-num]` - set icmp type (default icmp-echo = 8)
  816. ```bash
  817. hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>
  818. ```
  819. * `--flood` - sent packets as fast as possible (don't show replies)
  820. * `--rand-source` - random source address mode
  821. * `-d --data` - data size
  822. * `-w|--win` - winsize (default 64)
  823. ___
  824. ##### Tool: [netcat](http://netcat.sourceforge.net/)
  825. ```bash
  826. nc -kl 5000
  827. ```
  828. * `-l` - listen for an incoming connection
  829. * `-k` - listening after client has disconnected
  830. * `>filename.out` - save receive data to file (optional)
  831. ```bash
  832. nc 192.168.0.1 5051 < filename.in
  833. ```
  834. * `< filename.in` - send data to remote host
  835. ```bash
  836. nc -vz 10.240.30.3 5000
  837. ```
  838. * `-v` - verbose output
  839. * `-z` - scan for listening daemons
  840. ```bash
  841. nc -vzu 10.240.30.3 1-65535
  842. ```
  843. * `-u` - scan only udp ports
  844. ###### Transfer data file (archive)
  845. ```bash
  846. server> nc -l 5000 | tar xzvfp -
  847. client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000
  848. ```
  849. ###### Launch remote shell
  850. ```bash
  851. server> nc -l 5000 -e /bin/bash
  852. client> nc 10.240.30.3 5000
  853. ```
  854. ###### Simple file server
  855. ```bash
  856. while true ; do nc -l 5000 | tar -xvf - ; done
  857. ```
  858. ###### Simple HTTP Server
  859. > Restarts web server after each request - remove `while` condition for only single connection.
  860. ```bash
  861. cat > index.html << __EOF__
  862. <!doctype html>
  863. <head>
  864. <meta charset="utf-8">
  865. <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  866. <title></title>
  867. <meta name="description" content="">
  868. <meta name="viewport" content="width=device-width, initial-scale=1">
  869. </head>
  870. <body>
  871. <p>
  872. Hello! It's a site.
  873. </p>
  874. </body>
  875. </html>
  876. __EOF__
  877. ```
  878. ```bash
  879. server> while : ; do \
  880. (echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) \
  881. | nc -l -p 5000 \
  882. ; done
  883. ```
  884. * `-p` - port number
  885. ###### Simple HTTP Proxy (single connection)
  886. ```bash
  887. #!/usr/bin/env bash
  888. if [[ $# != 2 ]] ; then
  889. printf "%s\\n" \
  890. "usage: ./nc-proxy listen-port bk_host:bk_port"
  891. fi
  892. _listen_port="$1"
  893. _bk_host=$(echo "$2" | cut -d ":" -f1)
  894. _bk_port=$(echo "$2" | cut -d ":" -f2)
  895. printf " lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
  896. "$_listen_port" "$_bk_host" "$_bk_port"
  897. _tmp=$(mktemp -d)
  898. _back="$_tmp/pipe.back"
  899. _sent="$_tmp/pipe.sent"
  900. _recv="$_tmp/pipe.recv"
  901. trap 'rm -rf "$_tmp"' EXIT
  902. mkfifo -m 0600 "$_back" "$_sent" "$_recv"
  903. sed "s/^/=> /" <"$_sent" &
  904. sed "s/^/<= /" <"$_recv" &
  905. nc -l -p "$_listen_port" <"$_back" \
  906. | tee "$_sent" \
  907. | nc "$_bk_host" "$_bk_port" \
  908. | tee "$_recv" >"$_back"
  909. ```
  910. ```bash
  911. server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  912. lport: 8080
  913. bk_host: 192.168.252.10
  914. bk_port: 8000
  915. client> http -p h 10.240.30.3:8080
  916. HTTP/1.1 200 OK
  917. Accept-Ranges: bytes
  918. Cache-Control: max-age=31536000
  919. Content-Length: 2748
  920. Content-Type: text/html; charset=utf-8
  921. Date: Sun, 01 Jul 2018 20:12:08 GMT
  922. Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT
  923. ```
  924. ###### Create a single-use TCP or UDP proxy
  925. ```bash
  926. ### TCP -> TCP
  927. nc -l -p 2000 -c "nc [ip|hostname] 3000"
  928. ### TCP -> UDP
  929. nc -l -p 2000 -c "nc -u [ip|hostname] 3000"
  930. ### UDP -> UDP
  931. nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"
  932. ### UDP -> TCP
  933. nc -l -u -p 2000 -c "nc [ip|hostname] 3000"
  934. ```
  935. ___
  936. ##### Tool: [socat](http://www.dest-unreach.org/socat/doc/socat.html/)
  937. ###### Testing remote connection to port
  938. ```bash
  939. socat - TCP4:10.240.30.3:22
  940. ```
  941. * `-` - standard input (STDIO)
  942. * `TCP4:<params>` - set tcp4 connection with specific params
  943. * `[hostname|ip]` - set hostname/ip
  944. * `[1-65535]` - set port number
  945. ###### Redirecting TCP-traffic to a UNIX domain socket under Linux
  946. ```bash
  947. socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo
  948. ```
  949. * `TCP-LISTEN:<params>` - set tcp listen with specific params
  950. * `[1-65535]` - set port number
  951. * `bind=[hostname|ip]` - set bind hostname/ip
  952. * `reuseaddr` - allows other sockets to bind to an address
  953. * `fork` - keeps the parent process attempting to produce more connections
  954. * `su=nobody` - set user
  955. * `range=[ip-range]` - ip range
  956. * `UNIX-CLIENT:<params>` - communicates with the specified peer socket
  957. * `filename` - define socket
  958. ___
  959. ##### Tool: [lsof](https://en.wikipedia.org/wiki/Lsof)
  960. ###### Show process that use internet connection at the moment
  961. ```bash
  962. lsof -P -i -n
  963. ```
  964. ###### Show process that use specific port number
  965. ```bash
  966. lsof -i tcp:443
  967. ```
  968. ###### Lists all listening ports together with the PID of the associated process
  969. ```bash
  970. lsof -Pan -i tcp -i udp
  971. ```
  972. ###### List all open ports and their owning executables
  973. ```bash
  974. lsof -i -P | grep -i "listen"
  975. ```
  976. ###### Show all open ports
  977. ```bash
  978. lsof -Pnl -i
  979. ```
  980. ###### Show open ports (LISTEN)
  981. ```bash
  982. lsof -Pni4 | grep LISTEN | column -t
  983. ```
  984. ###### List all files opened by a particular command
  985. ```bash
  986. lsof -c "process"
  987. ```
  988. ###### View user activity per directory
  989. ```bash
  990. lsof -u username -a +D /etc
  991. ```
  992. ###### Show 10 Largest Open Files
  993. ```bash
  994. lsof / \
  995. | awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' \
  996. | sort -n -u | tail | column -t
  997. ```
  998. ___
  999. ##### Tool: [netstat](https://en.wikipedia.org/wiki/Netstat)
  1000. ###### Graph # of connections for each hosts
  1001. ```bash
  1002. 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 "" }'
  1003. ```
  1004. ###### Monitor open connections for specific port including listen, count and sort it per IP
  1005. ```bash
  1006. watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
  1007. ```
  1008. ___
  1009. ##### Tool: [rsync](https://en.wikipedia.org/wiki/Rsync)
  1010. ###### Rsync remote data as root using sudo
  1011. ```bash
  1012. rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/
  1013. ```
  1014. ___
  1015. ##### Tool: [host](https://en.wikipedia.org/wiki/Host_(Unix))
  1016. ###### Resolves the domain name (using external dns server)
  1017. ```bash
  1018. host google.com 9.9.9.9
  1019. ```
  1020. ###### Checks the domain administrator (SOA record)
  1021. ```bash
  1022. host -t soa google.com 9.9.9.9
  1023. ```
  1024. ___
  1025. ##### Tool: [dig](https://en.wikipedia.org/wiki/Dig_(command))
  1026. ###### Resolves the domain name (short output)
  1027. ```bash
  1028. dig google.com +short
  1029. ```
  1030. ###### Lookup NS record for specific domain
  1031. ```bash
  1032. dig @9.9.9.9 google.com NS
  1033. ```
  1034. ###### Query only answer section
  1035. ```bash
  1036. dig google.com +nocomments +noquestion +noauthority +noadditional +nostats
  1037. ```
  1038. ###### Query ALL DNS Records
  1039. ```bash
  1040. dig google.com ANY +noall +answer
  1041. ```
  1042. ###### DNS Reverse Look-up
  1043. ```bash
  1044. dig -x 172.217.16.14 +short
  1045. ```
  1046. ##### Tool: [dns-other](https://github.com/trimstray/awesome-ninja-admins#tool-dns-other)
  1047. ###### Resolves domain name from dns.google.com with curl and jq
  1048. ```bash
  1049. curl -s "https://dns.google.com/resolve?name=google.com&type=A" | jq .
  1050. ```
  1051. <a name="programming"><b>Programming</b></a>
  1052. ##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html)
  1053. ###### Remove duplicate entries in a file without sorting
  1054. ```bash
  1055. awk '!x[$0]++' filename
  1056. ```
  1057. ###### Exclude multiple columns using AWK
  1058. ```bash
  1059. awk '{$1=$3=""}1' filename
  1060. ```
  1061. ___
  1062. ##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html)
  1063. ###### To print a specific line from a file
  1064. ```bash
  1065. sed -n 10p /path/to/file
  1066. ```
  1067. ###### Remove a specific line from a file
  1068. ```bash
  1069. sed -i 10d /path/to/file
  1070. # alternative (BSD): sed -i'' 10d /path/to/file
  1071. ```
  1072. ###### Remove a range of lines from a file
  1073. ```bash
  1074. sed -i <file> -re '<start>,<end>d'
  1075. ```
  1076. ___
  1077. ##### Tool: [grep](http://www.grymoire.com/Unix/Grep.html)
  1078. ###### Search for a "pattern" inside all files in the current directory
  1079. ```bash
  1080. grep -rn "pattern"
  1081. grep -RnisI "pattern" *
  1082. fgrep "pattern" * -R
  1083. ```
  1084. ###### Remove blank lines from a file and save output to new file
  1085. ```bash
  1086. grep . filename > newfilename
  1087. ```
  1088. ###### Except multiple patterns
  1089. ```bash
  1090. grep -vE '(error|critical|warning)' filename
  1091. ```
  1092. ###### Show data from file without comments
  1093. ```bash
  1094. grep -v ^[[:space:]]*# filename
  1095. ```
  1096. ###### Show data from file without comments and new lines
  1097. ```bash
  1098. egrep -v '#|^$' filename
  1099. ```