Allow default setting of 'home' and 'shell' user attributes

Some customers will have their system's users defined remotely through LDAP or a similar module; these users might be defined on Windows AD, for example. Although typically there should be the ability to set a user's home directory and shell on this remote system, there may be a customer need to leave these undefined on the remote server. If one of these users log on to AIX, they will be put in '/' since they don't have a home directory defined, and ssh will make them use the /usr/bin/bsh shell. Likewise, 'lsuser ' will not show a value for home or shell, and a call to the getpwnam() or getuserattrs() API's will return nothing for home/shell. It would be very helpful in this situation to be able to set a default home or shell value - for example, in /etc/security/user file, in the default stanza, add something like: default: ...etc.. home = /home/$USERNAME shell = /usr/bin/ksh ...then, if a query is made to find a user's home or shell, and they are not found by a standard attribute query, check the /e/s/user file to see if they are set there, replace $USERNAME with the user's name, and use that. My understanding is that Linux sssd daemon has the ability to do something similar to this; by adding this kind of functionality to AIX, this could work whether the user is defined in LDAP, Centrify, or even if they are a local user that is missing their home or shell definition in /etc/passwd. Simply check if there is no value for home or shell after querying the user's registry module, and if there is not, check /e/s/user or some other config file. Regarding home - although it is possible to set HOME environement variable to /home/`whoami` and then do a 'cd $HOME' in the /etc/profile file, that is not a total solution, since lsuser, getpwnam, and getuserattrs will all still see a blank home value for a user.