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)