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tlsclient: tlsclient(1) for unix

This is a fork of moody's tlsclient(1) (https://shithub.us/moody/tlsclient/HEAD/info.html).
The primary change is that BoringSSL is vendored into the build system, so
it functions on any platform BoringSSL builds on. It also works fine with
standalone compiler environments that have only libc and libc++.

It has been tested on OpenBSD 7.0, RHEL 8.5/8.6, Ubunutu 20.04 on arm64, and a
statically linked x86_64-linux-musl compiler environment.

This repo contains:
	9cpu: rcpu(1) on unix
	tlsclient: tlsclient(1) on unix
	git-remote-hjgit: git remote helper for using hjgit repos.
	pam_p9.so: A pam module that authenticates against a 9front auth server.
	login_-dp9ik: An OpenBSD bsd auth executable that auths against a 9front auth server.

Most of the tlsclient code is pillaged from jsdrawterm: https://github.com/aiju/jsdrawterm
The main difference between tlsclient and drawterm is that tlsclient has stripped out the
plan9 kernel that runs in userspace. This means we use openssl for TLS and and don't provide
things like /mnt/term, but gain some more flexibility.

Usage:
	tlsclient [ -R ] [ -u user] [ -h host ] [ -a auth ] -p port cmd...

Example:
	tlsclient -R -u moody -h shithub.us -a p9auth.shithub.us newrepo tlsclient

	# with git-remote-hjgit in your $PATH
	git clone hjgit://shithub.us/user/repo

Building:
	$ make tlsclient

OpenBSD Authentication:
	Build:
		$ make login_-dp9ik
	Testing:
		./login_-dp9ik -d $USER
		# you will see authenticate/reject print out on stdout
		# for success/failure.
	Install:
		$ cp login_-dp9ik /usr/libexec/auth/
	Config:
		Each user is allowed to specify an auth
		server within '$HOME/.p9auth'. The file must
		have no group or other permissions set.

		Modify the auth-defaults line of /etc/login.conf
		to use the new executable. This will look something like:

		auth-defaults:auth=-dp9ik,passwd,skey:
	Notes:
		Unless you have a root user in your authdom, it is likely
		that installing this may lock you out of the root user,
		logging in with the username 'root:passwd' will authenticate
		against the system passwd file.
	See Also:
		login(1)

PAM Authentication:
	Build:
		$ make pam_p9.so
	Install and Config:
		Many systems configure PAM differently so defer to your OS
		documentation for where to store pam_p9.so and which pam
		configuration needs to be changed. Pam_p9.so accepts
		a single argument within the pam configuration, that being
		the auth server to use. Something akin to the following
		should work as additions to a pam configuration.

		auth sufficent pam_p9.so flan
		account sufficent pam_p9.so flan
	
		With "flan" being the hostname or ip of the desired auth server.