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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> - 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-cli](#tool-gnutls-cli)
  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. * [network-other](#tool-network-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. ###### Remount a filesystem as read/write
  336. ```bash
  337. mount -o remount,rw /
  338. ```
  339. ___
  340. ##### Tool: [fuser](https://en.wikipedia.org/wiki/Fuser_(Unix))
  341. ###### Kills a process that is locking a file
  342. ```bash
  343. fuser -k filename
  344. ```
  345. ###### Show what PID is listening on specific port
  346. ```bash
  347. fuser -v 53/udp
  348. ```
  349. ___
  350. ##### Tool: [ps](https://en.wikipedia.org/wiki/Ps_(Unix))
  351. ###### Show a 4-way scrollable process tree with full details
  352. ```bash
  353. ps awwfux | less -S
  354. ```
  355. ###### Processes per user counter
  356. ```bash
  357. ps hax -o user | sort | uniq -c | sort -r
  358. ```
  359. ___
  360. ##### Tool: [find](https://en.wikipedia.org/wiki/Find_(Unix))
  361. ###### Find files that have been modified on your system in the past 60 minutes
  362. ```bash
  363. find / -mmin 60 -type f
  364. ```
  365. ###### Find all files larger than 20M
  366. ```bash
  367. find / -type f -size +20M
  368. ```
  369. ###### Find duplicate files (based on MD5 hash)
  370. ```bash
  371. find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33
  372. ```
  373. ###### Change permission only for files
  374. ```bash
  375. cd /var/www/site && find . -type f -exec chmod 766 {} \;
  376. cd /var/www/site && find . -type f -exec chmod 664 {} +
  377. ```
  378. ###### Change permission only for directories
  379. ```bash
  380. cd /var/www/site && find . -type d -exec chmod g+x {} \;
  381. cd /var/www/site && find . -type d -exec chmod g+rwx {} +
  382. ```
  383. ###### Find files and directories for specific user
  384. ```bash
  385. find . -user <username> -print
  386. ```
  387. ###### Find files and directories for all without specific user
  388. ```bash
  389. find . \!-user <username> -print
  390. ```
  391. ###### Delete older files than 60 days
  392. ```bash
  393. find . -type f -mtime +60 -delete
  394. ```
  395. ###### Recursively remove all empty sub-directories from a directory
  396. ```bash
  397. find . -depth -type d -empty -exec rmdir {} \;
  398. ```
  399. ###### How to find all hard links to a file
  400. ```bash
  401. find </path/to/dir> -xdev -samefile filename
  402. ```
  403. ___
  404. ##### Tool: [top](https://en.wikipedia.org/wiki/Top_(software))
  405. ###### Use top to monitor only all processes with the specific string
  406. ```bash
  407. top -p $(pgrep -d , <str>)
  408. ```
  409. * `<str>` - process containing str (eg. nginx, worker)
  410. ___
  411. ##### Tool: [kill](https://en.wikipedia.org/wiki/Kill_(command))
  412. ###### Kill a process running on port
  413. ```bash
  414. kill -9 $(lsof -i :<port> | awk '{l=$2} END {print l}')
  415. ```
  416. ___
  417. ##### Tool: [diff](https://en.wikipedia.org/wiki/Diff)
  418. ###### Compare two directory trees
  419. ```bash
  420. diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)
  421. ```
  422. ___
  423. ##### Tool: [tail](https://en.wikipedia.org/wiki/Tail_(Unix))
  424. ###### Annotate tail -f with timestamps
  425. ```bash
  426. tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done
  427. ```
  428. ###### Analyse an Apache access log for the most common IP addresses
  429. ```bash
  430. tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail
  431. ```
  432. ###### Analyse web server log and show only 5xx http codes
  433. ```bash
  434. tail -n 100 -f /path/to/logfile | grep "HTTP/[1-2].[0-1]\" [5]"
  435. ```
  436. ___
  437. ##### Tool: [tar](https://en.wikipedia.org/wiki/Tar_(computing))
  438. ###### System backup with exclude specific directories
  439. ```bash
  440. cd /
  441. tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
  442. --exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .
  443. ```
  444. ###### System backup with exclude specific directories (pigz)
  445. ```bash
  446. cd /
  447. tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
  448. --exclude=proc/* --exclude=sys/* --exclude=dev/* \
  449. --exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .
  450. ```
  451. ___
  452. ##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))
  453. ###### System backup to file
  454. ```bash
  455. dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /
  456. ```
  457. ###### Restore system from lzo file
  458. ```bash
  459. cd /
  460. restore -rf /backup/system$(date +%d%m%Y%s).lzo
  461. ```
  462. ___
  463. ##### Tool: [cpulimit](http://cpulimit.sourceforge.net/)
  464. ###### Limit the cpu usage of a process
  465. ```bash
  466. cpulimit -p pid -l 50
  467. ```
  468. ___
  469. ##### Tool: [pwdx](https://www.cyberciti.biz/faq/unix-linux-pwdx-command-examples-usage-syntax/)
  470. ###### Show current working directory of a process
  471. ```bash
  472. pwdx <pid>
  473. ```
  474. ___
  475. ##### Tool: [taskset](https://www.cyberciti.biz/faq/taskset-cpu-affinity-command/)
  476. ###### Start a command on only one CPU core
  477. ```bash
  478. taskset -c 0 <command>
  479. ```
  480. ___
  481. ##### Tool: [tr](https://en.wikipedia.org/wiki/Tr_(Unix))
  482. ###### Show directories in the PATH, one per line
  483. ```bash
  484. tr : '\n' <<<$PATH
  485. ```
  486. ___
  487. ##### Tool: [chmod](https://en.wikipedia.org/wiki/Chmod)
  488. ###### Remove executable bit from all files in the current directory
  489. ```bash
  490. chmod -R -x+X *
  491. ```
  492. ###### Restore permission for /bin/chmod
  493. ```bash
  494. # 1:
  495. cp /bin/ls chmod.01
  496. cp /bin/chmod chmod.01
  497. ./chmod.01 700 file
  498. # 2:
  499. /bin/busybox chmod 0700 /bin/chmod
  500. # 3:
  501. setfacl --set u::rwx,g::---,o::--- /bin/chmod
  502. ```
  503. ___
  504. ##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))
  505. ###### Find last reboot time
  506. ```bash
  507. who -b
  508. ```
  509. ___
  510. ##### Tool: [screen](https://en.wikipedia.org/wiki/GNU_Screen)
  511. ###### Start screen in detached mode
  512. ```bash
  513. screen -d -m [<command>]
  514. ```
  515. ___
  516. ##### Tool: [du](https://en.wikipedia.org/wiki/GNU_Screen)
  517. ###### Show 20 biggest directories with 'K M G'
  518. ```bash
  519. du | sort -r -n | awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | head -n 20
  520. ```
  521. ___
  522. ##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)
  523. ###### Init tool everytime a file in a directory is modified
  524. ```bash
  525. while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;
  526. ```
  527. ___
  528. ##### Tool: [openssl](https://www.openssl.org/)
  529. ###### Testing connection to remote host
  530. ```bash
  531. echo | openssl s_client -connect google.com:443 -showcerts
  532. ```
  533. ###### Testing connection to remote host with specific ssl version
  534. ```bash
  535. openssl s_client -tls1_2 -connect google.com:443
  536. ```
  537. ###### Testing connection to remote host with specific ssl cipher
  538. ```bash
  539. openssl s_client -cipher 'AES128-SHA' -connect google.com:443
  540. ```
  541. ###### Generate private key
  542. ```bash
  543. # _ciph: des3, aes
  544. ( _ciph="des3" ; _fd="private.key" ; _len="2048" ; \
  545. openssl genrsa -${_ciph} -out ${_fd} ${_len} )
  546. ```
  547. ###### Remove password from private key
  548. ```bash
  549. ( _fd="private.key" ; _fd_unp="private_unp.key" ; \
  550. openssl rsa -in ${_fd} -out ${_fd_unp} )
  551. ```
  552. ###### Get public key from private key
  553. ```bash
  554. ( _fd="private.key" ; _fd_pub="public.key" ; \
  555. openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )
  556. ```
  557. ###### Generate private key + csr
  558. ```bash
  559. ( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
  560. openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )
  561. ```
  562. ###### Generate csr
  563. ```bash
  564. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  565. openssl req -out ${_fd_csr} -new -key ${_fd} )
  566. ```
  567. ###### Generate csr (metadata from exist certificate)
  568. ```bash
  569. ( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
  570. openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )
  571. ```
  572. ###### Generate csr with -config param
  573. ```bash
  574. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  575. openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
  576. -config <(
  577. cat <<-EOF
  578. [req]
  579. default_bits = 2048
  580. prompt = no
  581. default_md = sha256
  582. req_extensions = req_ext
  583. distinguished_name = dn
  584. [ dn ]
  585. C=<two-letter ISO abbreviation for your country>
  586. ST=<state or province where your organization is legally located>
  587. L=<city where your organization is legally located>
  588. O=<legal name of your organization>
  589. OU=<section of the organization>
  590. CN=<fully qualified domain name>
  591. [ req_ext ]
  592. subjectAltName = @alt_names
  593. [ alt_names ]
  594. DNS.1 = <fully qualified domain name>
  595. DNS.2 = <next domain>
  596. DNS.3 = <next domain>
  597. EOF
  598. ))
  599. ```
  600. ###### Convert DER to PEM
  601. ```bash
  602. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  603. openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )
  604. ```
  605. ###### Convert PEM to DER
  606. ```bash
  607. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  608. openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )
  609. ```
  610. ###### Checking whether the private key and the certificate match
  611. ```bash
  612. (openssl rsa -noout -modulus -in private.key | openssl md5 ; openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq
  613. ```
  614. ___
  615. ##### Tool: [gnutls-cli](https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html)
  616. ###### Testing connection to remote host (with sni)
  617. ```bash
  618. gnutls-cli -p 443 google.com
  619. ```
  620. ###### Testing connection to remote host (without sni)
  621. ```bash
  622. gnutls-cli --disable-sni -p 443 google.com
  623. ```
  624. ___
  625. ##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)
  626. ###### Secure delete with shred
  627. ```bash
  628. shred -vfuz -n 10 file
  629. shred --verbose --random-source=/dev/urandom -n 1 /dev/sda
  630. ```
  631. ###### Secure delete with scrub
  632. ```bash
  633. scrub -p dod /dev/sda
  634. scrub -p dod -r file
  635. ```
  636. ###### Secure delete with badblocks
  637. ```bash
  638. badblocks -s -w -t random -v /dev/sda
  639. badblocks -c 10240 -s -w -t random -v /dev/sda
  640. ```
  641. ###### Secure delete with secure-delete
  642. ```bash
  643. srm -vz /tmp/file
  644. sfill -vz /local
  645. sdmem -v
  646. swapoff /dev/sda5 && sswap -vz /dev/sda5
  647. ```
  648. ___
  649. ##### Tool: [dd](https://en.wikipedia.org/wiki/Dd_(Unix))
  650. ###### Show dd status every so often
  651. ```bash
  652. dd <dd_params> status=progress
  653. watch --interval 5 killall -USR1 dd
  654. ```
  655. <a name="http-https"><b>HTTP/HTTPS</b></a>
  656. ##### Tool: [curl](https://curl.haxx.se)
  657. ```bash
  658. curl -Iks https://www.google.com
  659. ```
  660. * `-I` - show response headers only
  661. * `-k` - insecure connection when using ssl
  662. * `-s` - silent mode (not display body)
  663. ```bash
  664. curl -Iks --location -X GET -A "x-agent" https://www.google.com
  665. ```
  666. * `--location` - follow redirects
  667. * `-X` - set method
  668. * `-A` - set user-agent
  669. ```bash
  670. curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com
  671. ```
  672. * `--proxy [socks5://|http://]` - set proxy server
  673. ###### Check DNS and HTTP trace with headers for specific domains
  674. ```bash
  675. ### Set domains and external dns servers.
  676. _domain_list=(google.com) ; _dns_list=("8.8.8.8" "1.1.1.1")
  677. for _domain in "${_domain_list[@]}" ; do
  678. printf '=%.0s' {1..48}
  679. echo
  680. printf "[\\e[1;32m+\\e[m] resolve: %s\\n" "$_domain"
  681. for _dns in "${_dns_list[@]}" ; do
  682. # Resolve domain.
  683. host "${_domain}" "${_dns}"
  684. echo
  685. done
  686. for _proto in http https ; do
  687. printf "[\\e[1;32m+\\e[m] trace + headers: %s://%s\\n" "$_proto" "$_domain"
  688. # Get trace and http headers.
  689. curl -Iks -A "x-agent" --location "${_proto}://${_domain}"
  690. echo
  691. done
  692. done
  693. unset _domain_list _dns_list
  694. ```
  695. ___
  696. ##### Tool: [httpie](https://httpie.org/)
  697. ```bash
  698. http -p Hh https://www.google.com
  699. ```
  700. * `-p` - print request and response headers
  701. * `H` - request headers
  702. * `B` - request body
  703. * `h` - response headers
  704. * `b` - response body
  705. ```bash
  706. http -p Hh --follow --max-redirects 5 --verify no https://www.google.com
  707. ```
  708. * `-F, --follow` - follow redirects
  709. * `--max-redirects N` - maximum for `--follow`
  710. * `--verify no` - skip SSL verification
  711. ```bash
  712. http -p Hh --follow --max-redirects 5 --verify no --proxy http:http://127.0.0.1:16379 https://www.google.com
  713. ```
  714. * `--proxy [http:]` - set proxy server
  715. <a name="network"><b>Network</b></a>
  716. ##### Tool: [ssh](https://www.openssh.com/)
  717. ###### Compare a remote file with a local file
  718. ```bash
  719. ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
  720. ```
  721. ###### SSH connection through host in the middle
  722. ```bash
  723. ssh -t reachable_host ssh unreachable_host
  724. ```
  725. ###### Run command over ssh on remote host
  726. ```bash
  727. cat > cmd.txt << __EOF__
  728. cat /etc/hosts
  729. __EOF__
  730. ssh host -l user $(<cmd.txt)
  731. ```
  732. ###### Get public key from private key
  733. ```bash
  734. ssh-keygen -y -f ~/.ssh/id_rsa
  735. ```
  736. ###### Get all fingerprints
  737. ```bash
  738. ssh-keygen -l -f .ssh/known_hosts
  739. ```
  740. ###### Ssh authentication with user password
  741. ```bash
  742. ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host
  743. ```
  744. ###### Ssh authentication with publickey
  745. ```bash
  746. ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
  747. ```
  748. ###### Simple recording SSH session
  749. ```bash
  750. function _ssh_sesslog() {
  751. _sesdir="<path/to/session/logs>"
  752. mkdir -p "${_sesdir}" && \
  753. ssh $@ 2>&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"
  754. }
  755. # Alias:
  756. alias ssh='_ssh_sesslog'
  757. ```
  758. ###### Using Keychain for SSH logins
  759. ```bash
  760. ### Delete all of ssh-agent's keys.
  761. function _scl() {
  762. /usr/bin/keychain --clear
  763. }
  764. ### Add key to keychain.
  765. function _scg() {
  766. /usr/bin/keychain /path/to/private-key
  767. source "$HOME/.keychain/$HOSTNAME-sh"
  768. }
  769. ```
  770. ___
  771. ##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)
  772. ###### Testing remote connection to port
  773. ```bash
  774. timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?
  775. ```
  776. * `<proto` - set protocol (tcp/udp)
  777. * `<host>` - set remote host
  778. * `<port>` - set destination port
  779. ###### Read and write to TCP or UDP sockets with common bash tools
  780. ```bash
  781. exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-
  782. ```
  783. ___
  784. ##### Tool: [tcpdump](http://www.tcpdump.org/)
  785. ```bash
  786. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443
  787. ```
  788. * `-n` - don't convert addresses
  789. * `-e` - print the link-level headers
  790. * `-i [iface]` - set interface
  791. * `-Q|-D [in|out|inout]` - choose send/receive direction (`-D` - for old tcpdump versions)
  792. * `host [ip|hostname]` - set host, also `[host not]`
  793. * `[and|or]` - set logic
  794. * `port [1-65535]` - set port number, also `[port not]`
  795. ```bash
  796. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap
  797. ```
  798. * `-c [num]` - capture only num number of packets
  799. * `-w [filename]` - write packets to file, `-r [filename]` - reading from file
  800. ___
  801. ##### Tool: [tcpick](http://tcpick.sourceforge.net/)
  802. ###### Analyse packets in real-time
  803. ```bash
  804. while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done
  805. ```
  806. ___
  807. ##### Tool: [ngrep](http://ngrep.sourceforge.net/usage.html)
  808. ```bash
  809. ngrep -d eth0 "www.google.com" port 443
  810. ```
  811. * `-d [iface|any]` - set interface
  812. * `[domain]` - set hostname
  813. * `port [1-65535]` - set port number
  814. ```bash
  815. ngrep -d eth0 "www.google.com" (host 10.240.20.2) and (port 443)
  816. ```
  817. * `(host [ip|hostname])` - filter by ip or hostname
  818. * `(port [1-65535])` - filter by port number
  819. ```bash
  820. ngrep -d eth0 -qt -O ngrep.pcap "www.google.com" port 443
  821. ```
  822. * `-q` - quiet mode (only payloads)
  823. * `-t` - added timestamps
  824. * `-O [filename]` - save output to file, `-I [filename]` - reading from file
  825. ```bash
  826. ngrep -d eth0 -qt 'HTTP' 'tcp'
  827. ```
  828. * `HTTP` - show http headers
  829. * `tcp|udp` - set protocol
  830. * `[src|dst] host [ip|hostname]` - set direction for specific node
  831. ```bash
  832. ngrep -l -q -d eth0 -i "User-Agent: curl*"
  833. ```
  834. * `-l` - stdout line buffered
  835. * `-i` - case-insensitive search
  836. ___
  837. ##### Tool: [hping3](http://www.hping.org/)
  838. ```bash
  839. hping3 -V -p 80 -s 5050 <scan_type> www.google.com
  840. ```
  841. * `-V|--verbose` - verbose mode
  842. * `-p|--destport` - set destination port
  843. * `-s|--baseport` - set source port
  844. * `<scan_type>` - set scan type
  845. * `-F|--fin` - set FIN flag, port open if no reply
  846. * `-S|--syn` - set SYN flag
  847. * `-P|--push` - set PUSH flag
  848. * `-A|--ack` - set ACK flag (use when ping is blocked, RST response back if the port is open)
  849. * `-U|--urg` - set URG flag
  850. * `-Y|--ymas` - set Y unused flag (0x80 - nullscan), port open if no reply
  851. * `-M 0 -UPF` - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply
  852. ```bash
  853. hping3 -V -c 1 -1 -C 8 www.google.com
  854. ```
  855. * `-c [num]` - packet count
  856. * `-1` - set ICMP mode
  857. * `-C|--icmptype [icmp-num]` - set icmp type (default icmp-echo = 8)
  858. ```bash
  859. hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>
  860. ```
  861. * `--flood` - sent packets as fast as possible (don't show replies)
  862. * `--rand-source` - random source address mode
  863. * `-d --data` - data size
  864. * `-w|--win` - winsize (default 64)
  865. ___
  866. ##### Tool: [netcat](http://netcat.sourceforge.net/)
  867. ```bash
  868. nc -kl 5000
  869. ```
  870. * `-l` - listen for an incoming connection
  871. * `-k` - listening after client has disconnected
  872. * `>filename.out` - save receive data to file (optional)
  873. ```bash
  874. nc 192.168.0.1 5051 < filename.in
  875. ```
  876. * `< filename.in` - send data to remote host
  877. ```bash
  878. nc -vz 10.240.30.3 5000
  879. ```
  880. * `-v` - verbose output
  881. * `-z` - scan for listening daemons
  882. ```bash
  883. nc -vzu 10.240.30.3 1-65535
  884. ```
  885. * `-u` - scan only udp ports
  886. ###### Transfer data file (archive)
  887. ```bash
  888. server> nc -l 5000 | tar xzvfp -
  889. client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000
  890. ```
  891. ###### Launch remote shell
  892. ```bash
  893. server> nc -l 5000 -e /bin/bash
  894. client> nc 10.240.30.3 5000
  895. ```
  896. ###### Simple file server
  897. ```bash
  898. while true ; do nc -l 5000 | tar -xvf - ; done
  899. ```
  900. ###### Simple minimal HTTP Server
  901. ```bash
  902. while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"' ; done
  903. ```
  904. ###### Simple HTTP Server
  905. > Restarts web server after each request - remove `while` condition for only single connection.
  906. ```bash
  907. cat > index.html << __EOF__
  908. <!doctype html>
  909. <head>
  910. <meta charset="utf-8">
  911. <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  912. <title></title>
  913. <meta name="description" content="">
  914. <meta name="viewport" content="width=device-width, initial-scale=1">
  915. </head>
  916. <body>
  917. <p>
  918. Hello! It's a site.
  919. </p>
  920. </body>
  921. </html>
  922. __EOF__
  923. ```
  924. ```bash
  925. server> while : ; do \
  926. (echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) \
  927. | nc -l -p 5000 \
  928. ; done
  929. ```
  930. * `-p` - port number
  931. ###### Simple HTTP Proxy (single connection)
  932. ```bash
  933. #!/usr/bin/env bash
  934. if [[ $# != 2 ]] ; then
  935. printf "%s\\n" \
  936. "usage: ./nc-proxy listen-port bk_host:bk_port"
  937. fi
  938. _listen_port="$1"
  939. _bk_host=$(echo "$2" | cut -d ":" -f1)
  940. _bk_port=$(echo "$2" | cut -d ":" -f2)
  941. printf " lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
  942. "$_listen_port" "$_bk_host" "$_bk_port"
  943. _tmp=$(mktemp -d)
  944. _back="$_tmp/pipe.back"
  945. _sent="$_tmp/pipe.sent"
  946. _recv="$_tmp/pipe.recv"
  947. trap 'rm -rf "$_tmp"' EXIT
  948. mkfifo -m 0600 "$_back" "$_sent" "$_recv"
  949. sed "s/^/=> /" <"$_sent" &
  950. sed "s/^/<= /" <"$_recv" &
  951. nc -l -p "$_listen_port" <"$_back" \
  952. | tee "$_sent" \
  953. | nc "$_bk_host" "$_bk_port" \
  954. | tee "$_recv" >"$_back"
  955. ```
  956. ```bash
  957. server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  958. lport: 8080
  959. bk_host: 192.168.252.10
  960. bk_port: 8000
  961. client> http -p h 10.240.30.3:8080
  962. HTTP/1.1 200 OK
  963. Accept-Ranges: bytes
  964. Cache-Control: max-age=31536000
  965. Content-Length: 2748
  966. Content-Type: text/html; charset=utf-8
  967. Date: Sun, 01 Jul 2018 20:12:08 GMT
  968. Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT
  969. ```
  970. ###### Create a single-use TCP or UDP proxy
  971. ```bash
  972. ### TCP -> TCP
  973. nc -l -p 2000 -c "nc [ip|hostname] 3000"
  974. ### TCP -> UDP
  975. nc -l -p 2000 -c "nc -u [ip|hostname] 3000"
  976. ### UDP -> UDP
  977. nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"
  978. ### UDP -> TCP
  979. nc -l -u -p 2000 -c "nc [ip|hostname] 3000"
  980. ```
  981. ___
  982. ##### Tool: [socat](http://www.dest-unreach.org/socat/doc/socat.html/)
  983. ###### Testing remote connection to port
  984. ```bash
  985. socat - TCP4:10.240.30.3:22
  986. ```
  987. * `-` - standard input (STDIO)
  988. * `TCP4:<params>` - set tcp4 connection with specific params
  989. * `[hostname|ip]` - set hostname/ip
  990. * `[1-65535]` - set port number
  991. ###### Redirecting TCP-traffic to a UNIX domain socket under Linux
  992. ```bash
  993. socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo
  994. ```
  995. * `TCP-LISTEN:<params>` - set tcp listen with specific params
  996. * `[1-65535]` - set port number
  997. * `bind=[hostname|ip]` - set bind hostname/ip
  998. * `reuseaddr` - allows other sockets to bind to an address
  999. * `fork` - keeps the parent process attempting to produce more connections
  1000. * `su=nobody` - set user
  1001. * `range=[ip-range]` - ip range
  1002. * `UNIX-CLIENT:<params>` - communicates with the specified peer socket
  1003. * `filename` - define socket
  1004. ___
  1005. ##### Tool: [lsof](https://en.wikipedia.org/wiki/Lsof)
  1006. ###### Show process that use internet connection at the moment
  1007. ```bash
  1008. lsof -P -i -n
  1009. ```
  1010. ###### Show process that use specific port number
  1011. ```bash
  1012. lsof -i tcp:443
  1013. ```
  1014. ###### Lists all listening ports together with the PID of the associated process
  1015. ```bash
  1016. lsof -Pan -i tcp -i udp
  1017. ```
  1018. ###### List all open ports and their owning executables
  1019. ```bash
  1020. lsof -i -P | grep -i "listen"
  1021. ```
  1022. ###### Show all open ports
  1023. ```bash
  1024. lsof -Pnl -i
  1025. ```
  1026. ###### Show open ports (LISTEN)
  1027. ```bash
  1028. lsof -Pni4 | grep LISTEN | column -t
  1029. ```
  1030. ###### List all files opened by a particular command
  1031. ```bash
  1032. lsof -c "process"
  1033. ```
  1034. ###### View user activity per directory
  1035. ```bash
  1036. lsof -u username -a +D /etc
  1037. ```
  1038. ###### Show 10 Largest Open Files
  1039. ```bash
  1040. lsof / \
  1041. | awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' \
  1042. | sort -n -u | tail | column -t
  1043. ```
  1044. ___
  1045. ##### Tool: [netstat](https://en.wikipedia.org/wiki/Netstat)
  1046. ###### Graph # of connections for each hosts
  1047. ```bash
  1048. 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 "" }'
  1049. ```
  1050. ###### Monitor open connections for specific port including listen, count and sort it per IP
  1051. ```bash
  1052. watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
  1053. ```
  1054. ___
  1055. ##### Tool: [rsync](https://en.wikipedia.org/wiki/Rsync)
  1056. ###### Rsync remote data as root using sudo
  1057. ```bash
  1058. rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/
  1059. ```
  1060. ___
  1061. ##### Tool: [host](https://en.wikipedia.org/wiki/Host_(Unix))
  1062. ###### Resolves the domain name (using external dns server)
  1063. ```bash
  1064. host google.com 9.9.9.9
  1065. ```
  1066. ###### Checks the domain administrator (SOA record)
  1067. ```bash
  1068. host -t soa google.com 9.9.9.9
  1069. ```
  1070. ___
  1071. ##### Tool: [dig](https://en.wikipedia.org/wiki/Dig_(command))
  1072. ###### Resolves the domain name (short output)
  1073. ```bash
  1074. dig google.com +short
  1075. ```
  1076. ###### Lookup NS record for specific domain
  1077. ```bash
  1078. dig @9.9.9.9 google.com NS
  1079. ```
  1080. ###### Query only answer section
  1081. ```bash
  1082. dig google.com +nocomments +noquestion +noauthority +noadditional +nostats
  1083. ```
  1084. ###### Query ALL DNS Records
  1085. ```bash
  1086. dig google.com ANY +noall +answer
  1087. ```
  1088. ###### DNS Reverse Look-up
  1089. ```bash
  1090. dig -x 172.217.16.14 +short
  1091. ```
  1092. ___
  1093. ##### Tool: [network-other](https://github.com/trimstray/awesome-ninja-admins#tool-network-other)
  1094. ###### Get all subnets for specific AS (Autonomous system)
  1095. ```bash
  1096. AS="AS32934"
  1097. whois -h whois.radb.net -- "-i origin ${AS}" \
  1098. | grep "^route:" \
  1099. | cut -d ":" -f2 \
  1100. | sed -e 's/^[ \t]//' \
  1101. | sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 \
  1102. | cut -d ":" -f2 \
  1103. | sed -e 's/^[ \t]/allow /' \
  1104. | sed 's/$/;/' \
  1105. | sed 's/allow */subnet -> /g'
  1106. ```
  1107. ###### Resolves domain name from dns.google.com with curl and jq
  1108. ```bash
  1109. _dname="google.com" ; curl -s "https://dns.google.com/resolve?name=${_dname}&type=A" | jq .
  1110. ```
  1111. <a name="programming"><b>Programming</b></a>
  1112. ##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html)
  1113. ###### Remove duplicate entries in a file without sorting
  1114. ```bash
  1115. awk '!x[$0]++' filename
  1116. ```
  1117. ###### Exclude multiple columns using AWK
  1118. ```bash
  1119. awk '{$1=$3=""}1' filename
  1120. ```
  1121. ___
  1122. ##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html)
  1123. ###### To print a specific line from a file
  1124. ```bash
  1125. sed -n 10p /path/to/file
  1126. ```
  1127. ###### Remove a specific line from a file
  1128. ```bash
  1129. sed -i 10d /path/to/file
  1130. # alternative (BSD): sed -i'' 10d /path/to/file
  1131. ```
  1132. ###### Remove a range of lines from a file
  1133. ```bash
  1134. sed -i <file> -re '<start>,<end>d'
  1135. ```
  1136. ___
  1137. ##### Tool: [grep](http://www.grymoire.com/Unix/Grep.html)
  1138. ###### Search for a "pattern" inside all files in the current directory
  1139. ```bash
  1140. grep -rn "pattern"
  1141. grep -RnisI "pattern" *
  1142. fgrep "pattern" * -R
  1143. ```
  1144. ###### Remove blank lines from a file and save output to new file
  1145. ```bash
  1146. grep . filename > newfilename
  1147. ```
  1148. ###### Except multiple patterns
  1149. ```bash
  1150. grep -vE '(error|critical|warning)' filename
  1151. ```
  1152. ###### Show data from file without comments
  1153. ```bash
  1154. grep -v ^[[:space:]]*# filename
  1155. ```
  1156. ###### Show data from file without comments and new lines
  1157. ```bash
  1158. egrep -v '#|^$' filename
  1159. ```