Server.tcl
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	# ===============================================
	# ========= ==== ====== ============
	# ============ ====== === === = ==========
	# ============ ===== ======== === =========
	# ============ ===== ============= ==========
	# ============ ===== ============ ===========
	# == DcK ===== ===== =========== ============
	# ============ ===== ========== =============
	# ============ ====== === === ==============
	# ============ ======= === ==========
	# ===============================================
	# ===============================================
	# == Tau Ceti Central == Server administration ==
	# == This is a very dangerous product to use ==
	# == Don't deploy it in stable environment ==
	# == Or say goodbye to the serv security ==
	# == This warning will not be repeated ==
	# == All your base are belong to us! ==
	# ===============================================
	# ===============================================
	#
	# (c) 2011 Sﾃｩbastien Santoro aka Dereckson.
	# Released under BSD license.

	bind bot - tc2 bot:tc2

	#
	# Eggdrop events
	#

	#Handles tc2 requests from linked bots
	proc bot:tc2 {sourcebot command text} {
	#Sourcebot: Nasqueron
	#Command: tc2
	#Text: requester Dereckson command phpfpm arg status
	set requester [dict get $text requester]
	set cmd [dict get $text command]
	set arg [dict get $text arg]
	set bind [dict get $text bind]
	set who [dict get $text who]

	#Logs entry
	log tc2 "$requester@$sourcebot" "$cmd $arg"

	#Executes command
	if [proc_exists tc2:command:$cmd] {
	putcmdlog "(tc2) <$requester@$sourcebot> $cmd $arg"
	set reply [tc2:command:$cmd $requester $arg]
	} {
	set reply "0 {Unknown command: $cmd}"
	}

	#Reports result
	putbot $sourcebot "tc2 [dict create success [lindex $reply 0] reply [lindex $reply 1] bind $bind who $who]"
	return 1
	}

	#
	# Helper procs
	#

	#Checks if $username begins by a letter and contains only letters, digits, -, _ or .
	proc tc2:username_isvalid {username} {
	regexp {^[A-Za-z][A-Za-z0-9_\-\.]*$} $username
	}

	#Determines if $username exists on the system
	#SECURITY: to avoid shell injection, call first tc2:username_isvalid $username
	proc tc2:username_exists {username} {
	#TODO: Windows and other OSes (this line has been tested under FreeBSD)
	if {[exec -- logins -oxl $username] == ""} {
	return 0
	} {
	return 1
	}
	}

	#Gets server hostname
	proc tc2:hostname {} {
	exec hostname -s
	}

	#Determines if $username is root
	proc tc2:isroot {username} {
	#Validates input data
	set username [string tolower $username]
	if ![tc2:username_isvalid $username] {
	return 0
	}

	#Check 1 - User has local accreditation
	if ![sql "SELECT count(*) FROM tc2_roots WHERE account_username = '$username' AND server_name = '[sqlescape [tc2:hostname]]'"] {
	return 0
	}

	#Check 2 - User is in the group wheel on the server
	if {[lsearch [exec -- id -Gn $username] wheel] == "-1"} {
	return 0
	} {
	return 1
	}
	}

	#Determines if $requester is EXPLICITELY allowed to allowed to manage the account $user
	#When you invoke this proc, you should also check if the user is root.
	# e.g. if {[tc2:isroot $requester] \|\| [tc2:userallow $requester $user]} { ... }
	proc tc2:userallow {requester user} {
	set sql "SELECT count(*) FROM tc2_users_permissions WHERE server_name = '[sqlescape [tc2:hostname]]' AND account_username = '[sqlescape $user]' AND user_id = [getuserid $user]"
	putdebug $sql
	sql $sql
	}

	#tc2:getpermissions on $username: Gets permissions on the $username account
	#tc2:getpermissions from $username: Gets permissions $username have on server accounts
	proc tc2:getpermissions {keyword username} {
	switch $keyword {
	"from" {
	set sql "SELECT account_username FROM tc2_users_permissions WHERE server_name = '[sqlescape [tc2:hostname]]' AND user_id = '[getuserid $username]'"
	}
	"on" {
	set sql "SELECT u.username FROM tc2_users_permissions p, users u WHERE p.server_name = '[sqlescape [tc2:hostname]]' AND p.account_username = '$username' AND u.user_id = p.user_id"
	}
	default {
	error "from or on expected"
	}
	}
	set accounts ""
	foreach row [sql $sql] {
	lappend accounts [lindex $row 0]
	}
	}

	#Creates an account $username froﾃm the $specified group
	proc tc2:createaccount {username group} {
	if {$group == "web"} {
	set key "tc2.[tc2:hostname].wwwroot"
	if {[set wwwroot [registry get $key]] == ""} {
	error "You must define the registry key $key"
	}
	set homedir $wwwroot/$username
	if [catch {
	set reply [exec -- pw user add $username -g $group -b $wwwroot -w random]
	exec -- mkdir -p -m 0711 $homedir
	exec -- chown -R $username:web $homedir
	} err] {
	append reply " / "
	append reply $err
	}
	return $reply
	} {
	exec -- pw user add $username -g $group -m -w random
	}
	}

	#Checks if $username begins by a letter and contains only letters, digits, -, _ or .
	proc tc2:isdomain {domain} {
	regexp "^\[a-z0-9A-Z\]\[a-z0-9A-Z\\-.\]*\[a-z0-9A-Z\]$" $domain
	}

	proc tc2:cutdomain {domain} {
	#a.b.hostname a.b hostname
	#a.tld a.tld
	#a.b.tld a b.tld
	set items [split $domain .]
	if {[llength $items] < 3} {
	list "" $domain
	} elseif {[llength $items] == 3} {
	list [lindex $items 0] [join [lrange $items 1 end] .]
	} {
	set hostname [exec hostname -f]
	set k [expr [llength $hostname] + 1]
	if {[lrange $items end-$k end] == [split $hostname .]} {
	list [join [lrange $items 0 $k] .] $hostname
	} {
	list [join [lrange $items 0 end-2] .] [join [lrange $items end-1 end] .]
	}
	}
	}

	#Determines if $username is a valid MySQL user
	proc tc2:mysql_user_exists {username} {
	sql7 "SELECT count(*) FROM mysql.user WHERE user = '[sqlescape $username]'"
	}

	#Gets the host matching the first $username MySQL user
	proc tc2:mysql_get_host {username} {
	sql7 "SELECT host FROM mysql.user WHERE user = '[sqlescape $username]' LIMIT 1"
	}

	#Gets a temporary password
	proc tc2:randpass {} {
	encrypt [rand 99999999] [rand 99999999]
	}

	#Adds the SSH key $key to the $username account
	proc tc2:sshaddkey {username key} {
	set sshdir "/home/$username/.ssh"
	set keysfile "$sshdir/authorized_keys"
	if ![file exists $sshdir] {
	exec -- mkdir -p -m 0700 $sshdir
	exec chown $username $sshdir
	}
	if ![file isdirectory $sshdir] {
	return 0
	}
	set fd [open $keysfile a]
	puts $fd $key
	close $fd
	exec chmod 600 $keysfile
	exec chown $username $keysfile
	return 1
	}

	#Guesses web user from requester or domain
	proc tc2:guesswebuser {requester domain} {
	foreach candidate [list $domain [string tolower $domain] $requester [string tolower $requester]] {
	if {[tc2:username_isvalid $candidate] && [tc2:username_exists $candidate]} {
	return $candidate
	}
	}
	registry get tc2.[tc2:hostname].nginx.defaultuser
	}

	#
	# tc2 commands
	#

	#account permission
	#account isroot
	#account exists
	#account create <username> <group> [SSH public key url]
	proc tc2:command:account {requester arg} {
	set command [lindex $arg 0]
	switch -- $command {
	"exists" {
	set username [lindex $arg 1]
	if ![tc2:username_isvalid $username] {
	return {0 "this is not a valid username"}
	}
	if [tc2:username_exists $username] {
	list 1 "$username is a valid account on [tc2:hostname]."
	} {
	list 1 "$username isn't a valid account on [tc2:hostname]."
	}
	}

	"isroot" {
	set username [lindex $arg 1]
	if ![tc2:username_isvalid $username] {
	return {0 "this is not a valid username"}
	}
	if [tc2:isroot $username] {
	list 1 "$username has got root accreditation on [tc2:hostname]."
	} {
	list 1 "$username doesn't seem to have any root accreditation [tc2:hostname]."
	}
	}

	"permission" {
	set username [lindex $arg 1]
	if ![tc2:username_isvalid $username] {
	return {0 "this is not a valid username"}
	}

	switch -- [lindex $arg 2] {
	"" {
	set sentences {}
	set accounts_from [tc2:getpermissions from $username]
	set accounts_on [tc2:getpermissions on $username]
	if {$accounts_on != ""} {
	lappend sentences "has authority upon [join $accounts_on ", "]"
	}
	if {$accounts_from != ""} {
	lappend sentences "account can be managed from IRC by [join $accounts_from ", "]"
	}
	if {[tc2:isroot $username]} {
	lappend sentences "has root access"
	}
	if {$sentences == ""} {
	list 1 nada
	} {
	list 1 "$username [join $sentences " / "]."
	}
	}

	"add" {
	#e.g. .account permission espacewin add dereckson
	# will give access to the espacewin account to dereckson
	if {![tc2:isroot $requester] && ![tc2:userallow $requester $username]} {
	return "0 {you don't have the authority to give access to $username account.}"
	}

	#Asserts mandataire has an account
	set mandataire [lindex $arg 3]
	if {[set mandataire_user_id [getuserid $mandataire]] == ""} {
	return "0 {please create first a bot account for $mandataire.}"
	}

	#Adds the permission
	sqlreplace tc2_users_permissions "server_name account_username user_id" [list [tc2:hostname] $username $mandataire_user_id]

	return "1 {$mandataire has now access to $username account.}"
	}

	"del" {
	#e.g. .account permission espacewin del dereckson
	# will remove access to the espacewin account to dereckson
	if {![tc2:isroot $requester] && ![tc2:userallow $requester $username]} {
	return "0 {you don't have the authority to manage the $username account.}"
	}

	#Asserts mandataire is a valid bot account
	set mandataire [lindex $arg 3]
	if {[set mandataire_user_id [getuserid $mandataire]] == ""} {
	return "0 {$mandataire doesn't have a bot account, and so, no such permission.}"
	}

	#Checks if the permission exists
	if ![tc2:userallow $requester $mandataire] {
	return "0 {$mandataire haven't had an access to $username account.}"
	}

	#Removess the permission
	sql "DELETE FROM tc2_users_permissions WHERE server_name = '[sqlescape [tc2:hostname]]' AND account_username = '$username' AND user_id = '$mandataire_user_id'"

	return "1 {$mandataire doesn't have access to $username account anymore.}"
	}

	"+root" {
	#Checks right and need
	if ![tc2:isroot $requester] {
	return "0 {you don't have root authority yourself.}"
	}
	if [tc2:isroot $username] {
	return "0 {$username have already root authority.}"
	}

	#Declares him as root
	sqlreplace tc2_roots "server_name account_username user_id" [list [tc2:hostname] $username [getuserid $username]]

	#Checks if our intervention is enough
	if [tc2:isroot $username] {
	list 1 "$username have now root authority."
	} {
	list 1 "$username have been added as root and will have root authority once in the wheel group."
	}
	}

	"-root" {
	if ![tc2:isroot $requester] {
	return {0 "you don't have root authority yourself."}
	}
	if ![tc2:isroot $username] {
	list 0 "$username doesn't have root authority."
	} {
	#Removes entry from db
	sql "DELETE FROM tc2_roots WHERE server_name = '[sqlescape [tc2:hostname]]' AND account_username = '[sqlescape $username]'"

	#Checks if our intervention is enough
	list 1 "$username doesn't have root authority on IRC anymore. Check also the wheel group."
	}
	}

	default {
	list 0 "expected: add <username>, del <username>, exists, +root, -root, or nothing"
	}
	}
	}

	"groups" {
	set username [lindex $arg 1]
	if ![tc2:username_isvalid $username] {
	return {0 "this is not a valid username"}
	}
	if [tc2:username_exists $username] {
	list 1 [exec -- id -Gn $username]
	} {
	list 0 "$username isn't a valid account on [tc2:hostname]."
	}
	}

	"create" {
	#Checks access and need
	set username [lindex $arg 1]
	if ![tc2:username_isvalid $username] {
	return {0 "this is not a valid username"}
	}
	if [tc2:username_exists $username] {
	return "0 {there is already a $username account}"
	}
	if ![tc2:isroot $requester] {
	return "0 {you don't have root authority, which is required to create an account.}"
	}

	#Checks group
	set group [lindex $arg 2]
	set validgroups [registry get tc2.[tc2:hostname].usergroups]
	if {$group == ""} {
	return "0 {In which group? Must be amongst $validgroups.}"
	}
	if {[lsearch $validgroups $group] == -1} {
	return "0 {$group isn't a valid group, must be among $validgroups}"
	}

	#Checks public key URL
	if {[set url [geturls [lindex $arg 3]]] != ""} {
	set password [tc2:createaccount $username $group]
	set key [geturltext $url]
	if {$key != "" && [tc2:sshaddkey $username $key]} {
	return [list 1 "account created"]
	} {
	return [list 1 "account created but can't install SSH key ; you can use the password $password"]
	}
	}

	#Creates user
	list 1 [tc2:createaccount $username $group]
	}

	"" {
	return {0 "permission, isroot, exists or groups expected"}
	}

	default {
	set reply 0
	lappend reply "unknown command: $command"
	}
	}
	}

	#.mysql create database [username]
	proc tc2:command:mysql {requester arg} {
	switch -- [set command [lindex $arg 0]] {
	"create" {
	set database [lindex $arg 1]
	set username [lindex $arg 2]
	if ![tc2:username_isvalid $database] {
	list 0 "Invalid database name: $database"
	} elseif [file exists [registry get tc2.[tc2:hostname].mysql.datadir]/$database] {
	list 1 "database $database already exists"
	} elseif {$username == ""} {
	if {[tc2:mysql_user_exists $database]} {
	tc2:command:mysql $requester [list create $database $database]
	} {
	#Ok, create the database and a new user with same login than db and random password
	set password [tc2:randpass]
	if [catch {
	sql7 "CREATE DATABASE $database"
	sql7 "GRANT ALL PRIVILEGES ON $database.* TO '$database'@'localhost' IDENTIFIED BY '$password'"
	} err] {
	list 0 $err
	} {
	list 1 "database created, with rights granted to user $database, with $password as temporary password"
	}
	}
	} {
	if {![tc2:username_isvalid $username]} {
	list 0 "Invalid username: $username"
	}
	if {[tc2:isroot $requester] \|\| [tc2:userallow $requester $username]} {
	if [catch {
	set host [tc2:mysql_get_host $username]
	sql7 "CREATE DATABASE $database"
	sql7 "GRANT ALL PRIVILEGES ON $database.* TO '$username'@'$host'"
	} err] {
	list 0 $err
	} {
	list 1 "database $database created, with rights granted to $username@$host"
	}
	} {
	[list 0 "You aren't root nor have authority on $username"
	}
	}
	}

	default {
	list 0 "try .mysql create <database> \[username\]"
	}
	}
	}

	#.nginx reload
	#.nginx status
	#.nginx server add <domain> [directory] [+php]
	#.nginx server edit <domain> <new directory>
	#.nginx server edit <domain> <-php\|+php>
	proc tc2:command:nginx {requester arg} {
	switch -- [set command [lindex $arg 0]] {
	"reload" {
	if [catch {exec /usr/local/etc/rc.d/nginx reload} output] {
	if {[string first "is successful" $output] == -1} {
	return [list 0 $output]
	} {
	return {1 "ok, nginx reloaded"}
	}
	} {
	return {1 "ok, nginx reloaded"}
	}
	}

	"status" {
	set conn [exec sockstat \| grep nginx \| grep -c tcp]
	if {$conn == 0} {
	return {1 "nginx not running"}
	} {
	return "1 {$conn connection[s $conn]}"
	}
	return $reply
	}

	"create" {
	tc2:command:nginx server add [lrange $arg 1 end]
	}

	"server" {
	#.nginx server add <domain> [directory] [+php]
	#.nginx server edit <domain> <+php\|-php>
	set subcommand [lindex $arg 1]
	set domain [lindex $arg 2]

	putdebug "if $subcommand != {} && $domain != {} && \[tc2:isdomain $domain\]"

	if {$subcommand != "" && $domain != "" && [tc2:isdomain $domain]} {
	set fulldomain $domain
	foreach "subdomain domain" [tc2:cutdomain $fulldomain] {}
	set etcdir [registry get tc2.[tc2:hostname].nginx.etcdir]
	set config $etcdir/$domain.conf
	switch $subcommand {
	add {
	#Default options
	global username
	set wwwdir [registry get tc2.[tc2:hostname].wwwroot]/$domain/$subdomain
	set logdir [registry get tc2.[tc2:hostname].nginx.logdir]/$domain
	set user [tc2:guesswebuser $requester $domain]
	set tpl vhost.tpl
	set php 0

	#Parses options
	for {set i 3} {$i < [llength $arg]} {incr i} {
	set option [lindex $arg $i]
	if {$option == "+php"} {
	set php 1
	set tpl vhost-php.tpl
	} elseif {[string index $option 0] == "/"} {
	set wwwdir $option
	} else {
	return [list 0 "Unknown option: $option"]
	}
	}

	#TODO: check if $user is legitimate
	if {$user != "www" && ![tc2:isroot $requester] && ![tc2:userallow $requester $user]} {
	return "0 {you don't have the authority to create a website linked to $user account.}"
	}

	#Gets php-fpm port
	if $php {
	set port [sqlscalar "SELECT pool_port FROM tc2_phpfpm_pools WHERE pool_user = '[sqlescape $user]'"]
	if {$port == ""} {
	#Fallbacks to default www pool
	set port [registry get tc2.[tc2:hostname].phpfpm.defaultport]
	if {$port == ""} {
	return "0 {no pool for $user, and tc2.[tc2:hostname].phpfpm.defaultport registry key isn't defined to fallback to www pool}"
	}
	}
	} {
	set port ""
	}

	#Creates directory if needed
	if ![file exists $wwwdir] {
	exec -- mkdir -m 0711 -p $wwwdir
	exec -- chown $user $wwwdir
	}

	#Opens or creates domain config file
	if [file exists $config] {
	set fd [open $config a]
	} {
	#We use a also template for ou config file header
	set fd [open $etcdir/vhost-header.tpl r]
	set template [read $fd]
	close $fd
	set fd [open $config w]
	puts $fd [string map "%DOMAIN% $domain" $template]
	flush $fd
	}

	#Writes new config
	set fd2 [open $etcdir/$tpl r]
	set template [read $fd2]
	close $fd2
	puts $fd ""
	puts $fd [string map [list %REQUESTER% $requester %TIME% [unixtime] %COMMENT% "Autogenerated by $username" %FULLDOMAIN% $fulldomain %LOGDIR% $logdir %SUBDOMAIN% $subdomain %WWWDIR% $wwwdir %PORT% $port %CUSTOM-PREPHP% "" %CUSTOM-PHP% "" %CUSTOM% ""] $template]
	close $fd
	return [list 1 "done, $fulldomain server block added to $config ; use .nginx reload to save"]
	}

	edit {
	return [list 1 "not yet implemented, edit the file $config"]
	}
	}
	}
	return {0 "usage: .nginx server add/edit domain \[options\]"}
	}

	"" {
	return {0 "server add, server edit, status or reload expected"}
	}

	default {
	set reply 0
	lappend reply "unknown command: $command"
	}
	}

	}

	#phpfpm reload
	#phpfpm status
	#phpfpm create <user>
	proc tc2:command:phpfpm {requester arg} {
	set command [lindex $arg 0]

	switch $command {
	"reload" {
	if [catch {exec /usr/local/etc/rc.d/php-fpm reload} output] {
	list 0 [string map {"\n" " "} $output]
	} {
	return {1 "ok, php-fpm reloaded"}
	}
	}

	"restart" {
	if [catch {exec /usr/local/etc/rc.d/php-fpm restart} output] {
	list 0 [string map {"\n" " "} $output]
	} {
	return {1 "ok, php-fpm reloaded"}
	}
	}

	"status" {
	catch {exec /usr/local/etc/rc.d/php-fpm status} output
	list 1 [string map {"\n" " "} $output]
	}

	"create" {
	set user [lindex $arg 1]
	if {$user == ""} {
	return {0 "syntax: phpfpm create <user>"}
	}
	if ![tc2:username_isvalid $user] {
	return {0 "not a valid username"}
	}
	if ![tc2:username_exists $user] {
	return "0 {$user isn't a valid [tc2:hostname] user}"
	}
	if [file exists [set file "/usr/local/etc/php-fpm/$user.conf"]] {
	return "0 {there is already a $user pool}"
	}
	if {![tc2:isroot $requester] && ![tc2:userallow $requester $user]} {
	return "0 {you don't have the authority to create a pool under $user user}"
	}
	set port [sql "SELECT MAX(pool_port) FROM tc2_phpfpm_pools"]
	if {$port == ""} {
	set port 9000
	} {
	incr port
	}

	#Adds it in MySQL table
	set time [unixtime]
	sqladd tc2_phpfpm_pools {pool_user pool_port pool_requester pool_time} [list $user $port $requester $time]

	#Write config gile
	global username
	set fd [open /usr/local/etc/php-fpm/pool.tpl r]
	set template [read $fd]
	close $fd
	set fd [open $file w]
	puts $fd [string map "%REQUESTER% $requester %TIME% $time %PORT% $port %USER% $user %GROUP% [exec -- id -gn $user] %COMMENT% {Autogenerated by $username}" $template]
	close $fd
	exec -- chown root:config $file
	exec -- chmod 644 $file
	return {1 "pool created, use '.phpfpm reload' to enable it"}
	}

	"" {
	return {0 "create, status or reload expected"}
	}

	default {
	set reply 0
	lappend reply "unknown command: $command"
	}
	}
	}

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