#!/bin/sh
set -e -f ${DRY_RUN:+-n} -u
tool=$(readlink -e "${0%/*}")
. "$tool"/lib/rule.sh
. "$tool"/etc/vm.sh

rule_help () { # SYNTAX: [--hidden]
	local hidden; [ ${1:+set} ] || hidden=set
	cat >&2 <<-EOF
		DESCRIPTION:
		  ce script regroupe des règles pour administrer la VM ($vm_fqdn)
		  _depuis_ une machine distante ;
		  il sert à la fois d'outil (aisément bidouillable)
		  et de documentation (préçise).
		  Voir \`$tool/vm_host'   pour les règles côté machine hôte ($vm_host).
		  Voir \`$tool/vm_hosted' pour les règles côté VM hébergée ($vm_fqdn).
		SYNTAX: $0 \$RULE \${RULE}_SYNTAX
		RULES:
		$(sed -ne "s/^rule_\(${hidden:+[^_]}[^ ]*\) () {\( *#.*\|\)/  \1\2/p" "$tool"/etc/vm.sh "$0")
		ENVIRONMENT:
		  TRACE # affiche les commandes avant leur exécution
		$(sed -ne 's/^readonly \([^ ][^ =]*\).*}\( *#.*\|\)$/\t$\1\2/p' "$tool"/etc/vm.sh "$0")
		EOF
 }

rule_git_configure () { # DESCRIPTION: configure ./.git correctement
	(
	cd "$tool"
	git remote rm host || true
	git remote add host $vm_host:src/vm
	git config --replace remote.host.push HEAD:refs/remotes/master
	git remote rm hosted || true
	git remote add hosted $vm_fqdn:src/vm
	git config --replace remote.hosted.push HEAD:refs/remotes/master
	git submodule update --init
	)
 }
rule_git_push () { # SYNTAX: {host|hosted} $git_push_options
	(
	cd "$tool"
	local remote=${1#remote=}; shift
	GIT_SSH=./lib/ssh git push -v "$remote" "$@"
	)
 }

rule_ssh () {
	"$tool"/lib/ssh $vm_fqdn "$@"
 }
rule_mosh () {
	mosh --ssh="$tool/lib/ssh $*" $vm_fqdn
 }
rule__ssh_known_hosts_update () {
	rule ssh \
	 -o StrictHostKeyChecking=no \
	 -o CheckHostIP=no \
	 -o HashKnownHosts=no \
	 whoami
 }

rule__x509_site_key_decrypt () { # SYNTAX: $site
	local site="$1"; shift
	gpg --decrypt "$tool"/var/sec/x509/"$site"/key.pass.gpg |
	openssl rsa -passin 'stdin' \
	 -in  var/sec/x509/"$site"/key.pem \
	 -out '/dev/stdout'
 }

rule_luks_key_send () { # DESCRIPTION: envoie la clef de déchiffrement des partitions au démarrage de la VM.
	gpg --decrypt var/sec/luks/$vm_fqdn.key.gpg |
	"$tool"/lib/ssh root@$vm_fqdn "$@" \
	 -o CheckHostIP=no \
	 -o HostKeyAlias=init.$vm_fqdn \
	 tee /lib/cryptsetup/passfifo \>/dev/null
 }
rule_luks_key_backup () { # SYNTAX: ${gpg_options:---recipient $USER@} DESCRIPTION: sauvegarde localement les entêtes des partitions chiffrées.
	test "${*+set}" || set -- --recipient "$USER@"
	for part in root var home
	 do
		mkdir -p var/sec/luks
		rule ssh -l root ' \
			set -e -f -u;
			exec 2>/dev/null;
			tmp=$(mktemp -t "luks.'"$part"'.XXXXXXXX.tmp" --dry-run);
			cryptsetup luksHeaderBackup >/dev/null \
			 /dev/'"$vm_lvm_vg"'/'"$vm_lvm_lv"'_'"$part"' \
			 --header-backup-file "$tmp"; \
			cat "$tmp";
			shred >/dev/null --remove "$tmp"; \
		 ' |
		gpg "$@" --encrypt \
		 -o var/sec/luks/${vm_lvm_lv}_${part}.luks.gpg
	 done
 }

rule_apache2_key_send () {
	local -; set +f
	for conf in "$tool"/etc/nginx/site.d/*/key_send
	 do conf=${conf#"$tool"/etc/nginx/site.d/}
		local site=${conf%/key_send}
		rule _x509_site_key_decrypt \
		 "$(cat "$tool"/etc/apache2/site.d/"$site"/x509_host)" |
		rule ssh -l root ' \
			sudo install -d -m 770 -o '"$user"' -g '"$user"' \
			 /etc/apache2 \
			 /etc/apache2/x509.d \
			 /etc/apache2/x509.d/'"$site"'; \
			sudo install -m 644 -o '"$user"' -g '"$user"' /dev/stdin \
			 /etc/apache2/x509.d/'"$site"'/.gitignore <<-EOF
				key.pem
				EOF
			sudo install -m 400 -o root -g root \
			 /dev/stdin \
			 /etc/apache2/x509.d/'"'$site'"'/key.pem
		 '
	 done
 }
rule_dovecot_key_send () {
	rule _x509_site_key_decrypt imap."$vm_domainname" |
	rule ssh -l root ' \
		sudo install -d -m 770 -o root -g root \
		 /etc/dovecot/'"$vm_domainname"'/ \
		 /etc/dovecot/'"$vm_domainname"'/imap \
		 /etc/dovecot/'"$vm_domainname"'/imap/x509 ; \
		sudo install -m 644 -o root -g root /dev/stdin \
		 /etc/dovecot/'"$vm_domainname"'/imap/x509/.gitignore <<-EOF
			key.pem
			EOF
		sudo install -m 400 -o root -g root \
		 /dev/stdin \
		 /etc/dovecot/"$vm_domainname"/imap/x509/key.pem
	 '
 }
rule_gitolite_git () {
	(
	cd "$tool"/etc/gitolite
	GIT_SSH=../../lib/ssh \
	ssh-agent sh -c ' \
		SSH_ASKPASS='"$tool"'/lib/ssh-pass \
		SSH_ID=git \
		ssh-add '"$tool"'/var/sec/ssh/git </dev/null && \
		git '"$*"
	)
 }
rule_nginx_configure () {
	local -; set +f
	for conf in "$tool"/etc/nginx/site.d/*/site.conf
	 do conf=${conf#"$tool"/etc/nginx/site.d/}
		local site="${conf%/site.conf}"
		if test -f "$tool"/etc/nginx/site.d/"$site"/x509_host
		 then
			rule _x509_site_key_decrypt \
			 "$(cat "$tool"/etc/nginx/site.d/"$site"/x509_host)" |
			rule ssh -l root ' \
				sudo install -d -m 770 -o root -g root \
				 /etc/nginx \
				 /etc/nginx/x509.d \
				 /etc/nginx/x509.d/'"'$site'"'; \
				sudo install -m 644 -o root -g root /dev/stdin \
				 /etc/nginx/x509.d/'"'$site'"'/.gitignore <<-EOF
					key.pem
					EOF
				sudo install -m 400 -o root -g root /dev/stdin \
				 /etc/nginx/x509.d/'"'$site'"'/key.pem
			 '
		 fi
		test ! -r "$tool"/etc/nginx/site.d/"$site"/remote.sh ||
		.         "$tool"/etc/nginx/site.d/"$site"/remote.sh
	 done
 }
rule_postfix_key_send () {
	rule _x509_site_key_decrypt smtpd."$vm_domainname" |
	rule ssh -l root ' \
		sudo install -d -m 770 -o root -g root \
		 /etc/postfix/'"$vm_domainname"'/ \
		 /etc/postfix/'"$vm_domainname"'/smtpd \
		 /etc/postfix/'"$vm_domainname"'/smtpd/x509; \
		sudo install -m 644 -o root -g root /dev/stdin \
		 /etc/postfix/'"$vm_domainname"'/smtp/x509/.gitignore <<-EOF
			key.pem
			EOF
		sudo install -m 644 -o root -g root /dev/stdin \
		 /etc/postfix/'"$vm_domainname"'/smtpd/x509/.gitignore <<-EOF
			key.pem
			EOF
		install -m 400 -o root -g root \
		 /dev/stdin \
		 /etc/postfix/'"'$vm_domainname'"'/smtpd/x509/key.pem
	 '
 }

rule=${1:-help}
${1+shift}
case $rule in
 (help);;
 (*)
	assert 'test ! "$(hostname --fqdn)" = "$vm_fqdn"' vm_fqdn
	assert 'test ! "$(hostname --fqdn)" = "$vm_host"' vm_host
	;;
 esac
rule $rule "$@"