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Hi Alexander, I think we can use PAM authentication with something similar as you did is a good mechanism. And also I have an additional question, can the implemented PAM authentication module be used from JDBC connections? Or they works totally apart? Thank you so much! Regards, Cesar From: Alexander Kukushkin [mailto:cyberdemn@xxxxxxxxx]
Hi, 2018-01-24 22:27 GMT+01:00 Julio Cesar Tenganan Daza <ctenganand@xxxxxxxxxx>:
Postgres can use pam for authentication. I am not sure that such plugin already exists, but it shouldn't be very hard to implement it. There are a few problems though: 1. JWT token already contains information about username, but you still have to provide it (username) when opening connection. 2. Token has to be send as a connection password. Therefor connection must be encrypted. 3. Usually JWT tokens are quite big in size, but for example when psql is asking you for a password, it thinks that password can't be longer than 100 characters. And this value is hard-coded. It's possible to overcome this issue if you
specify your token in PGPASSWORD env variable. We at Zalando are using JWT tokens to authenticate employees when they are accessing postgres databases, but we are not dealing with JWT directly. We have some OAuth infrastructure in-place, which can validate JWT tokens. At the end it boiled down to sending http request to tokeninfo service and validating its answer. Source code of PAM module is here:
https://github.com/CyberDem0n/pam-oauth2 Basically you can do something similar. Either take pam-oauth2 as a reference and add possibility to validate JWT tokens or implement your tokeninfo service.
Regards, -- Alexander Kukushkin |
