CODEWITHSUNDEEP
pythonemaildebiandkim
clarkk
clarkk

Reputation: 27685

Use dkimpy from command line

How to use this python library from the command line?

https://pypi.python.org/pypi/dkimpy

I have a raw email message I want to validate the DKIM signature.. But how.. Can't find any docs about the usage

The raw message is a string/stream

Upvotes: 1

Views: 2180

Answers (1)

Jaymon
Jaymon

Reputation: 5728

First I needed a test message, this is how I got one:

  • Opened Gmail and selected an email.
  • Clicked the vertical 3 dots on the top right side of the message view
  • Selected Show original
  • Clicked Download Original and saved it to ~/original_msg.txt

I then opened up a terminal window and made sure I was in my home directory:

$ cd ~

Then I installed dkimpy:

$ pip install dkimpy

Annoyingly, dkimverify --help didn't work, but man came to the rescue:

$ man dkimverify
dkimverify(1)

NAME
       dkimverify - Script for DKIM verifying messages on stdin

DESCRIPTION
       dkimverify reads an RFC822 message on standard input, and returns with exit code 0 
       if the signature verifies successfully. Otherwise, it returns with exit code 1.

so I verified my downloaded Gmail message:

$ cat original_msg.txt | dkimverify
signature ok
$ echo $?
0

And just to make sure it failed as expected, I created a bogus message:

$ echo "bogus-header:bogus email" > bogus_msg.txt

And then tried to validate it:

$ cat bogus_msg.txt | dkimverify
signature verification failed
$ echo $?
1

Upvotes: 2

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