Re: change session's login shell
Tim Nowaczyk <[email protected]>
| Newsgroups | gmane.linux.pam |
|---|---|
| Message-ID | <[email protected]> |
On Jul 25, 2011, at 5:04 PM, Frank Van Damme wrote: > 2011/7/25 Jason Clifford <[email protected]>: >> On Mon, Jul 25, 2011 at 2:11 PM, Frank Van Damme <[email protected]> >> wrote: >>> >>> I'd like to change a user's shell based on group membership. The group >>> membership is no problem - that's what pam_listfile is for. Changing >>> the shell, however, seems non-obvious. I've looked at the source code >>> of pam_unix and it provides the path to the users login shell >>> according to /etc/passwd, so it should be possible for a pam module to >>> set the shell to an arbitrary value, right? >> >> No because it's the ssh daemon or the login process that sets the shell. > > So they each use their own methods like grepping /etc/passwd, doing > ldap lookups, or whatever it takes to come up with a shell - like > "nothing" in the case of obscure authentication methods that the > application happens to know nothing about? > This is out of scope for the pam list, but you should know that you can simply call getpwnam so you don't have to grep /etc/passwd. Many large installations don't even have most of their users in /etc/passwd, but use NIS or LDAP instead. getpwnam uses NSS to get all the users/passwords/groups. Your initial feature request might be able to be implemented by writing a custom NSS module. [1] Cheers, Tim Nowaczyk [1] http://www.gnu.org/s/hello/manual/libc/Extending-NSS.html#Extending-NSS -- Timothy Nowaczyk Network Systems Engineer University of Virginia - ITC [email protected]