Date: Fri, 27 Jan 2012 18:34:19 +0100 From: =?UTF-8?B?SmVhbi1Tw6liYXN0aWVuIFDDqWRyb24=?= <dumbbell@FreeBSD.org> To: Gleb Kurtsou <gleb.kurtsou@gmail.com>, freebsd-current@freebsd.org Cc: Pierre-Gilles Mialon <pierre-gilles@yakaz.com>, Romain Vrignaud <romain@yakaz.com> Subject: Re: [patch] pam_exec: use program exit code instead of PAM_SYSTEM_ERR Message-ID: <4F22E01B.3010204@FreeBSD.org> In-Reply-To: <20120126100745.GA62071@reks> References: <4F1EBF42.4050307@FreeBSD.org> <20120126100745.GA62071@reks>
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On 26.01.2012 11:07, Gleb Kurtsou wrote:
> On (24/01/2012 15:25), Jean-Sébastien Pédron wrote:
>> Attached is a patch that changes the behaviour to always return
>> the program exit code as-is.
>
> Please consider making it optional. It will break for generic
> applications because pam_sm_chauthtok error codes are documented
> and standardized.
You're right, thanks. I attached a new patch with the following changes:
o Instead of making it optionnal, I preferred to check the exit
code for each pam_sm_* functions supported. Here are the rules:
- If the code is allowed, it's returned as is.
- If the exit code is 1 (not an allowed PAM code here),
PAM_PERM_DENIED is returned. I added this because 1 is a
common exit code for errors.
- For any other codes, a message is logged about this
invalid value and PAM_SERVICE_ERR is returned.
o I changed return code from PAM_SYSTEM_ERR to PAM_SERVICE_ERR for
the WIFSIGNALED(status) and !WIFEXITED(status) cases.
PAM_SYSTEM_ERR is still returned if a syscall fails.
o A new environment variable is set before calling the program:
PAM_SM_FUNC. It contains the name of the pam_sm_* function. The
program can use it to determine which exit codes are allowed.
o The pam_sm_* function name is also added to messages logged from
_pam_exec().
o waitpid() is now called in a loop. If it returned because of
EINTR, do it again. Before, it would return PAM_SYSTEM_ERR
without waiting for the child to exit.
I expanded the man page with these informations.
Again, thanks for your comments! If you have more, they're welcome :)
- --
Jean-Sébastien Pédron
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