gpg-bash-lib is a gpg file verification bash library, addresses comprehensive threat model, that covers file name tampering, indefinite freeze, rollback, endless data attacks, etc.
https://github.com/Whonix/gpg-bash-lib
Why?
Writing bash scripts that do file verification using gpg that really is secure and passes a comprehensive threat model, that covers indefinite freeze, rollback, endless data attacks, etc. is hard.
gpg-bash-lib's goal is to provide a bash library that we can collaboratively develop, audit and abstract the hard work into reuseable functions.
Checking gpg exit codes only is insufficient. Quote Werner Koch [1] (gnupg lead developer):
"there is no clear distinction between the codes and for proper error reporting you are advised to use the --status-fd messages."
(For a definition of these attacks, see TUF [2] (The Update Framework)'s [3] threat model [4] [5].)
Mini Demo:
After installation, if you would run the following command.
/usr/share/gpg-bash-lib/examples/one
You would see the following output.
your_script_begin: ...
verification: BEGIN
verification: END
your_script_output: BEGIN
gpg_bash_lib_output_failure_status: false
gpg_bash_lib_output_gpg_verify_exit_code: 0
gpg_bash_lib_output_goodsig_status: true
gpg_bash_lib_output_validsig_status: true
gpg_bash_lib_output_fingerprint_in_hex: 5E08605EBEA0FE88695DCB88FD0A8B4171DFE4E4
gpg_bash_lib_output_signed_on_unixtime: 1422049448
gpg_bash_lib_output_signed_on_date: March 01 13:56:27 UTC 2015
gpg_bash_lib_output_notation[$file at name]: test-file
gpg_bash_lib_output_file_name_tampering: false
gpg_bash_lib_output_freshness_status: true
gpg_bash_lib_output_freshness_detail: current
gpg_bash_lib_output_freshness_msg:
- Freshness: Signature is current.
- valid-max: Signatures are valid up to 30 days.
- Signature Creation Date: March 01 13:56:27 UTC 2015
- Current System Date聽聽聽 : March 02 16:0:55 UTC 2015
- Local System Clock: Your clock seems okay.
- Relative Signature Creation Time: According to your system clock, signature was created 2 days 26 minutes 3 seconds ago.
gpg_bash_lib_output_alright_status: true
your_script_output: END
All information (Signature Creation Date, etc.) are easily accessible through separate variables, which are all documented.
Documentation:
https://github.com/Whonix/gpg-bash-lib/blob/master/README.mediawiki
Usage examples:
https://github.com/Whonix/gpg-bash-lib/tree/master/usr/share/gpg-bash-lib/examples
Main code file:
https://github.com/Whonix/gpg-bash-lib/blob/master/usr/lib/gpg-bash-lib/modules.d/50_common
Specifically, does the status-fd parsing code look sane?
https://github.com/Whonix/gpg-bash-lib/blob/d6cff902f40135c3e100a5bb13a6fe8275a41828/usr/lib/gpg-bash-lib/modules.d/50_common#L350
Could you leave some feedback please?
Anyone else interested to contribute?
[1] http://lists.gnupg.org/pipermail/gnupg-devel/2005-December/022559.html
[2] https://www.updateframework.com/
[3] https://github.com/theupdateframework/tuf
[4] https://github.com/theupdateframework/tuf/blob/develop/SECURITY.md
[5] http://www.webcitation.org/6F7Io2ncN
This post has been automatically cross-posted by whonix.org/blog To see the original (including links), go to /blog/gpg-bash-verification-library
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