pam_sm_chauthtok(3) Library Functions Manual pam_sm_chauthtok(3)
NAME
pam_sm_chauthtok - Service provider implementation for pam_chauthtok
SYNOPSIS
[ flag ... ] file ... [ library ... ]
DESCRIPTION
In response to a call to the PAM framework calls from the modules listed in the pam.conf(4) file. The password management provider sup-
plies the back-end functionality for this interface function.
changes the authentication token associated with a particular user referenced by the authentication handle, pamh.
The following flag may be passed in to
The password service should not generate any messages.
The password service should only update those passwords that have aged.
If this flag is not passed, the password service should update all passwords.
The password service should only perform preliminary checks.
No passwords should be updated.
The password service should update passwords.
Note that and can not be set at the same time.
Upon successful completion of the call, the authentication token of the user will be ready for change or will be changed (depending upon
the flag) in accordance with the authentication scheme configured within the system.
The argc argument represents the number of module options passed in from the configuration file pam.conf(4). argv specifies the module
options, which are interpreted and processed by the password management service. Please refer to the specific module man pages for the
various available options.
It is the responsibility of to determine if the new password meets certain strength requirements. may continue to re-prompt the user (for
a limited number of times) for a new password until the password entered meets the strength requirements.
Before returning, should call and retrieve both and If both are NULL, should set them to the new and old passwords as entered by the user.
APPLICATION USAGE
Refer to pam(3) for information on thread-safety of PAM interfaces.
NOTES
The PAM framework invokes the password services twice. The first time the modules are invoked with the flag, During this stage, the pass-
word modules should only perform preliminary checks (ping remote name services to see if they are ready for updates, for example). If a
password module detects a transient error (remote name service temporarily down, for example) it should return to the PAM framework, which
will immediately return the error back to the application. If all password modules pass the preliminary check, the PAM framework invokes
the password services again with the flag, During this stage, each password module should proceed to update the appropriate password. Any
error will again be reported back to application.
If a service module receives the flag, it should check whether the password has aged or expired. If the password has aged or expired, then
the service module should proceed to update the password. If the status indicates that the password has not yet aged/expired, then the
password module should return
If a user's password has aged or expired, a PAM account module could save this information as state in the authentication handle, pamh,
using The related password management module could retrieve this information using to determine whether or not it should prompt the user to
update the password for this particular module.
RETURN VALUES
Upon successful completion, must be returned. The following values may also be returned:
No permission.
Authentication token manipulation error.
Old authentication token cannot be recovered.
Authentication token lock busy.
Authentication token aging disabled.
User unknown to password service.
Preliminary check by password service failed.
SEE ALSO
pam(3), pam_chauthtok(3), pam.conf(4).
pam_sm_chauthtok(3)