Using NIS with Shadow SupportNext: Using the Traditional NIS Up: The Network Information System
Previous: Using the passwd andUsing NIS with Shadow SupportThere is no NIS support yet for sites that use the shadow login suite.
John F.-Haugh, the author of the shadow suite, recently released a
version of the shadow library functions covered by the GNU Library GPL
to comp.sources.misc. It already has some support for NIS, but
it isn't complete, and the files haven't been added to the standard C
library yet. On the other hand, publishing the information from
/etc/shadow via NIS kind of defeats the purpose of the shadow
suite.Although the NYS password lookup functions don't use a shadow.byname
map or anything likewise, NYS supports using a local /etc/shadow
file transparently. When the NYS implementation of getpwnam is
called to look up information related to a given login name, the facilities
specified by the passwd entry in nsswitch.conf are
queried. The nis service will simply look up the name in the
passwd.byname map on the NIS server. The files service,
however, will check if /etc/shadow is present, and if so, try to
open it. If none is present, or if the user doesn't have root
privilege, if reverts to the traditional behavior of looking up the user
information in /etc/passwd only. However, if the shadow file
exists and can be opened, NYS will extract the user password from
shadow. The getpwuid function is implemented accordingly. In
this fashion, binaries compiled with NYS will deal with a local
the shadow suite installation transparently.Andrew AndersonThu Mar 7 23:22:06 EST 1996
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