Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Remove useless getpwnam() call.

Submitted by: Arthur Mesh <amesh@juniper.net>
MFC after: 1 week

Ensure pam_lastlog removes the /dev/ component of the TTY name.

Some consumers of PAM remove the /dev/ component (i.e. login), while
others don't (i.e. su). We must ensure that the /dev/ component is
removed to ensure that the utmpx entries properly work with tools such
as w(1).

Discussed with: des
MFC after: 1 week

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

merge r196650 from head (via stable/8): tty might be NULL

Approved by: re (kib@)

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Let pam_lastlog use random ut_id's.

By using random values for ut_id, not based on the TTY name, it is
possible to run for example login(1) multiple times on the same TTY,
without overwriting any previous records.

The output of w(1) will then be as follows:

| 12:26PM up 2 days, 2:31, 5 users, load averages: 0.01, 0.03, 0.03
| USER TTY FROM LOGIN@ IDLE WHAT
| ed pts/2 mekker.80386.nl 12:26PM - w
| root pts/2 - 12:26PM - w
| root pts/2 - 12:26PM - w
| root pts/2 - 12:26PM - w

Approved by: des

Let pam_lastlog use utmpx instead of libulog's utmpx interface.

It will still use ulog_login(3) and ulog_logout(3), which will remain
present.

Several refinements to libulog's API.

- Only set the fields in the ulog_utmpx structure that are valid for the
command in question. This means that strings like "shutdown" or "~"
are not visible to the user anymore.
- Rename UTXF_* to UTXI_*, indicating the indexation, instead of using
the `antique' filename. If we ever get rid of utmp, it makes little
sense calling it by its old name.

Convert pam_lastlog(8) to libulog.

The information used by the "Last login:"-line is obtained by using
ulog_setutxfile(3) to switch to the lastlog database. Login and logout
are performed using the utility functions ulog_login(3) and
ulog_logout(3).

This also means we must build libulog during bootstrap.

Approved by: des

Prevents pam_lastlog from segfaulting on session close when tty is null.

MFC after: 1 month

- Import the HEAD csup code which is the basis for the cvsmode work.

Apply the same error checks to PAM_TTY in pam_sm_close_session() as in
pam_sm_open_session(), avoiding false negatives when no tty is present.

Submitted by: Todd C. Miller <millert@courtesan.com>
Approved by: re (rwatson)
MFC after: 2 weeks

Whitespace cleanup

Approved by: re (rwatson)

Additional debugging stuff I had in my tree.

Implement pam_sm_close_session().

PR: bin/61657
Submitted by: Joe R. Doupnik <jrd@cc.usu.edu>

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.

Treat an empty PAM_RHOST the same as a NULL one.

PR: bin/51508

utmp.ut_time and lastlog.ll_time are explicitly int32_t rather than
time_t. Deal with the possibility that time_t != int32_t. This boils
down to this sort of thing:
- time(&ut.ut_time);
+ ut.ut_time = time(NULL);
and similar for ctime(3) etc. I've kept it minimal for the stuff
that may need to be portable (or 3rd party code), but used Matt's time32
stuff for cases where that isn't as much of a concern.

Approved by: re (jhb)

Missed one in previous commit.

Pointed out by: nectar

Hide a couple of unguarded error returns behind the no_fail test.

Add a no_fail option.

Sponsored by: DARPA, NAI Labs

Oops, fix an inverted if test.

Strip /dev/ from tty name, and clean up the "last login" printout.

Sponsored by: DARPA, NAI Labs

Major cleanup:

- add __unused where appropriate
- PAM_RETURN -> return since OpenPAM already logs the return value.
- make PAM_LOG use openpam_log()
- make PAM_VERBOSE_ERROR use openpam_get_option() and check flags
for PAM_SILENT
- remove dummy functions since OpenPAM handles missing service
functions
- fix various warnings

Sponsored by: DARPA, NAI Labs

NAI DBA update.

Switch to OpenPAM. Bump library version. Modules are now versioned, so
applications linked with Linux-PAM will still work.
Remove pam_get_pass(); OpenPAM has pam_get_authtok().
Remove pam_prompt(); OpenPAM has pam_{,v}{error,info,prompt}().
Remove pam_set_item(3) man page as OpenPAM has its own.

Sponsored by: DARPA, NAI Labs

Create /var/log/lastlog if it doesn't exist.

Submitted by: des

#include cleanup.

Sponsored by: DARPA, NAI Labs

WARNS=n fixes (and some stylistic issues).

WARNS=4 fixes. Protect with NO_WERROR for the modules that have
warnings that are hard to fix or that I've been asked to leave alone.

Change the order in which pam_sm_open_session() updates the logs. This
doesn't really make any difference, except it matches wtmp(5) better.

Don't do anything in pam_sm_close_session(); init(8) will take care of
utmp and wtmp when the tty is released. Clearing them here would make it
possible to create a ghost session by logging in, running 'login -f $USER'
and exiting the subshell.

Sponsored by: DARPA, NAI Labs (but the bugs are all mine)

Style nits.

Sponsored by: DARPA, NAI Labs

Add a PAM module that records sessions in utmp/wtmp/lastlog.

Sponsored by: DARPA, NAI Labs