Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add support for the "account" facility.

PR: 115164
MFC after: 1 week

Check if the specified group is the user's primary group before
iterating over the (possibly empty) list of members. Otherwise, we
get a false negative when the target group has no members listed in
/etc/group. This went mostly unnoticed because root is explicitly
listed as a member of wheel, so the bug is never triggered in the most
common use case, which is su(8).

PR: 109416
MFC after: 1 week

Mention the name of the module in warning messages.

Add "ruser" and "luser" options. The former corresponds to the current
behavior, where the module checks that the supplicant is a member of the
required group. The latter checks the target user instead. If neither
option was specified, pam_group(8) assumes "ruser" and issues a warning.
I intend to eventually change the default to "luser" to match the
behavior of similarly-named service modules in other operating systems.

MFC after: 1 month

Fix strict aliasing breakage in PAM modules (except pam_krb5, which needs
more work than the others). This should make most modules build with -O2.

Use pam_get_user(3) instead of pam_get_item(3) where appropriate.

Maybe I was a little too fast? Remove debugging code, and commit the
Makefile and man page which I'd forgotten to 'cvs add'.

Sponsored by: DARPA, NAI Labs

Replace pam_wheel(8) with pam_group(8) which has a cleaner interface. The
pam_wheel(8) module was written to work in spite of a broken libpam, and
has grown organically since its inception, which is reflected in both its
functionality and implementation. Rather than clean up pam_wheel(8) and
break backward compatibility, I've chosen to reimplement it under a new,
more generic name.

Sponsored by: DARPA, NAI Labs