A PAM module to test SSH/SUDO passwords against HaveIBeenPwnd

github.com

2 points·stevekemp··5 comments

So anyone that uses sudo on the box it is installed on will be sending a hash of their password to an API? What warning will users receive before putting in their pw?

Sending the first five characters of the SHA1-hash of their password - not the complete thing. (Though I appreciate that if you care about potential privacy-leaks that might not be much of a mitigating factor.)

I would assume that this module would be installed explicitly and deliberately by a company, organization, or group, and that the people who did that would inform their users.

(i.e. I don't expect this would be randomly installed on a machine accidentally. Though if you use a shared-hosting/shell-provider you probably have bigger concerns than a side-effect of this being present.)

Fair enough :-) Would it be feasible to add something in the module that could optionally send a string to the user to say that some portion of a hash of their pw will be verified against that API?

I am thinking of the cases where a security org enables this on a jump box, but only sends an email that gets lost among the myriad of other emails that people do not read. It would be great if there was a banner that could be sent to make privacy and compliance teams happier.

It wouldn't be impossible, but when I think of the automated-tools that would drive sudo I'm wary of producing unexpected output by default.

I would guess that the kind of org that wanted this would probably be using some kind of automation so they could issue the notification via /etc/issue, /etc/issue.net, or similar central fashion.

Maybe I'm optimistic!

Excellent. I was looking for sane example of a Pam module involving https.

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