Command line tool to convert env variables beginning with user to a htpasswd file

Overview

envhtp

This command line tool converts environment variables whose keys start with "user_" into htpasswd compatible username/password pairs.

The goal is to easily create Traefik-compatible htpasswd secrets (for BasicAuth middleware, see https://doc.traefik.io/traefik/middlewares/http/basicauth) in a CI/CD environment. The htpasswd content is Base64 encoded for this purpose and then output to stdout.

Warning: htpasswd-files generated with this tool are not considered to be super secure. Do not use this to protect production sites or sensitive data. The reason is that wether this implementation nor the underlying bcrypt implementation is audited (as far as i know) and the random number generator used to create the hashes may be insecure.

However - i use it to protect review deployments.

$ envhtp --help

envhtp 1.0.0
Florian Neumann 
   
    
Command line tool to convert env variables beginning with user to a htpasswd file.

USAGE:
    envhtp [OPTIONS]

OPTIONS:
    -h, --help                 Print help information
    -n, --no-base64            Do not encode htpasswd with Base64
    -p, --pattern 
    
         Pattern to match the beginning of env variable names. Uses remaining
                               part of env key as username [default: user_]
    -V, --version              Print version information

    
   

Examples

$ USER_Florian=Florian ./envhtp
RmxvcmlhbjokMmIkMDUkWFNLZHZPeWNBZlRLR2ExZkdWczZFLkZvRG53Q3ltT2l5eGdGOXRKSmMxWnd0RGV4YlhEek8K

$ USER_Florian=Florian ./envhtp -n
Florian:$2b$05$ok43ZDvLYUL8EVtzfyf5/OVc9iBgsn12xWjzqL43EXD5.kCGknXWq

$ lil_flo=florian lil_you=you ./envhtp -np 'lil_'
flo:$2b$05$Qs22hV79ExJEyxOnYh3SieQzTNUS1WxOOcrzuNEf8kAwYDxiZaz8q
you:$2b$05$2zFo5l7oW099/Wj4Tn5J4OHnWoQ8FWPHylbwGApon7Bv0CwVvu1Pe

Pipe into a file for further usage:

$ lil_flo=florian lil_you=you ./envhtp -np 'lil_' > .htpasswd

$ cat .htpasswd 
flo:$2b$05$X/diD1PdqfDkqginEZRVN.FdrX5etQY4c57VuelrdIOc9ijWGFsX6
you:$2b$05$5.JlIjRmZ9T7Oa045p0frOOfxmJCEwRKOcJTkyLQYCpna8baxZKRq

$ htpasswd -vb .htpasswd you you
Password for user you correct.

MIT License – Copyright (c) 2022 – Florian Neumann

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