Contact Simon Ruderich

simon@ruderich.org

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tlsproxy

tlsproxy is a simple TLS proxy for HTTPS which intercepts TLS connections and verifies the server certificate - if it changes it sends an error message back to the client, otherwise it forwards the traffic between server and client.

It’s designed to prevent man-in-the-middle attacks if an attacker can get a CA to sign a different server certificate for a website. As the browser has the CA’s certificate it verifies the new server certificate just fine and the user doesn’t know he’s talking to a different machine. tlsproxy prevents that.

See tlsproxy for more information and downloads.

Algorithmen und Datenstrukturen

Tafelübung C3: Folien

Configuration files

I use mostly console programs and I have accumulated quite some configuration files which might be useful to others. They are commented and therefore quite useful to newcomers as well. The major features of the configuration files are listed in each section.

If you have any suggestions/improvements/fixes/questions please tell me at simon@ruderich.org.

• Vim, one of the best text editors: vimrc (updated 2012-01-25)

  • jj or jk as <Esc> to exit insert and command mode

  • all cursors keys disabled ;-) (Ctrl-N/Ctrl-P in command mode as replacement and Ctrl-F of course)

  • :set hidden for efficient handling of multiple buffers (called tabs in other editors)

  • go to last position when reopening a file

  • UTF-8 as default encoding, ISO-Latin automatically detected

  • auto correction of :W to :w (and similar mistakes)

  • highlighting of TODO, FIXME, CHANGED, XXX, etc.

  • highlight unicode whitespace

  • highlight lines longer than 78 characters

  • disable spell checking while diffing (vimdiff)

  • custom statusline similar to default one

  • gb/gB as shortcut for :bnext/:bprev

  • * and # for visual mode

  • automatically disable paste after leaving insert mode

  • write current file when suspending (Ctrl-Z) or when running :make

  • add undo breakpoints for insert-mode commands which change a lot: <C-U>, <C-@>, <C-A>, <C-W>.

  • compatibility with older Vim versions

• Zsh, one of the best shells: zshrc (updated 2012-01-25)

  • set terminal title to running program (working in xterm, rxvt, screen - window title here), works with fg (uses the correct program name)

  • vi bindings, including vi-like Ctrl-N/Ctrl-P history completion, jj or jk to exit insert mode.

  • colored multi-line prompt including vcs_info

  • colored stderr (not working perfectly, suggestions welcome)

  • global aliases for less (L), grep (G), sort (S), etc.; example usage: program G test S L instead of program | grep test | sort | less

  • very short aliases (e.g. g = git, m = mutt, s = mpc, v = vim, etc.)

  • don’t complete unimportant files for vim (like .log, .aux - useful when using LaTeX); provide Ctrl-F as fallback to complete all files

  • well documented completion settings

  • automatically add visited directories to directory stack

  • automatically reattach to running screen session or open a new one

  • compatibility with older zsh versions

  Also available as Git repository with additional configuration files for zsh, bash, screen, less:
  git clone http://ruderich.org/simon/config/shell.git

• GNU readline, command-line editing library with history support, used by bash and many other programs: inputrc (updated 2012-01-14)

  • A single <Tab> lists all available matches.

  • List all available matches and use a pager in case they don’t fit on the current screen.

  • Use Vi editing-mode, jj and jk exit insert mode.

  • <Ctrl-P>/<Ctrl-N> work like <Up>/<Down> but list only history lines starting with the current input line. Very useful to recall old commands quickly.

• Git, one of the best DVCS: gitconfig (updated 2011-09-18)

  • very short aliases (e.g. ap = add -p, c = commit, d = diff, dc = diff --cached, s = status, ss = stash save, sa = stash apply, etc.)

  • use pager for some commands (branch, status, tag)

  • allow diffing of gzip, PDFs and SQLite files using .gitattributes

• tig, a gitk like viewer for the console: tigrc (updated 2010-09-13)

• GNU Screen, terminal multiplexer: screenrc (updated 2012-01-25)

  • readable hardstatus and caption settings ;-)

  • fast switching to windows 10 to 19 (Ctrl-A ; 0 to Ctrl-A ; 9)

  • support for urlview to open URLs quickly

• xmonad, powerful tiling window manager: xmonad.hs (updated 2011-06-19)

  • horizontal split workspace

  • switch to vertical split/horizontal split with only one window at the bottom with bindings - meta-space skips these layouts

  • special layout for Gimp

  • some programs are spawned on specific workspaces

  • new windows are not opened in the master pane (thus not stealing focus)

  • when using multiple screens switching to visible workspaces doesn’t move them to the current screen, but switches to the workspace on the other screen

  • works with xmonad 0.9 and newer versions (most settings should work with 0.7)

• Elinks, powerful console based browser: elinks.conf (updated 2011-03-15)

  • vi-like bindings

  • URI rewriting rules for fast browsing, e.g. "s string" to search for string, "w name" to look up name in wikipedia, "d word" to translate word etc.

  • Session support

• openssh, encrypted connections to remote computers: .ssh/config (updated 2011-09-18)

  • Protocol 2 only (for security reasons)

  • share multiple sessions over a single connection (ControlMaster), enabled with -M

• lftp, powerful FTP client: lftprc (updated 2010-09-13)

  • colored prompt

  • sync alias which syncs a local directory with one on a server

Other useful console programs include:

• Mutt, powerful mail user agent (MUA)

• t-prot, display filter for MUAs

• Irssi, very powerful IRC client; supports Vi(m) modes using the vim_mode.pl script (documentation at the beginning of the file, additional documentation)
  Other useful scripts for irssi include:

  • ack.pl: jump to next active window, with tiebreakers

  • act.pl: reset window activity status

  • spellcheck.pl: spell checking

  • splitlong.pl: automatically split overlong messages

  • trackbar.pl: mark last position in each window

  • usercount.pl: display user count in channel

  • window_switcher.pl: fast window switching

• rss2email, RSS to mail converter, very useful in combination with mutt to read RSS feeds

• htop, top improvement for Linux

• MPD, Music Player Daemon, a server to play audio files

• cdparanoia, audio extraction tool for sampling CDs

• lltag, command-line ogg/flac/mp3 file tagger and renamer

• bc, arbitrary precision calculator supporting different input and output bases