gosh: Security theater for piped shell scripts

Concerned about theoretical man-in-the-middle attacks when piping scripts from curl to your shell?

Enter gosh. It's like a TSA backscatter machine for your computer. Install it with RubyGems:

$ gem install gosh

Then pipe it a shell script:

$ curl https://github.com/sstephenson/gosh/raw/master/hello.sh | gosh

gosh will open the script in your $EDITOR where you can review it for any liquids, metals, explosives, or unattended baggage. If you accept the contents of the script, enter YES at the top of the file, save it, close it, and gosh will run it. Otherwise, just close the file and it won't be run.

Extra-secure SHA512 digest mode

In addition to the interactive mode described above, gosh can also accept a SHA512 digest from the command line with the -d flag:

$ curl https://github.com/sstephenson/gosh/raw/master/hello.sh | gosh -d c131b1a23b0279072cfe59bca7a69fe4a41e9ad2c825ac0deacc2e836e817193b4a4f587ee4d287e960ef416718b4d2c3531716b3f343b1d129f241f79ea2c3b

If the specified digest does not match the digest of the piped script, gosh will refuse to execute it.

License

(The MIT License)

Copyright (c) 2011 Sam Stephenson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.