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(*
Module: Ssh
Parses ssh client configuration
Author: Jiri Suchomel <jsuchome@suse.cz>
About: Reference
ssh_config man page
About: License
This file is licensed under the GPL.
About: Lens Usage
Sample usage of this lens in augtool
(start code)
augtool> set /files/etc/ssh/ssh_config/Host example.com
augtool> set /files/etc/ssh/ssh_config/Host[.='example.com']/RemoteForward/machine1:1234 machine2:5678
augtool> set /files/etc/ssh/ssh_config/Host[.='example.com']/Ciphers/1 aes128-ctr
augtool> set /files/etc/ssh/ssh_config/Host[.='example.com']/Ciphers/2 aes192-ctr
(end code)
*)
module Ssh =
autoload xfm
(************************************************************************
* Group: USEFUL PRIMITIVES
*************************************************************************)
let eol = Util.doseol
let spc = Util.del_ws_spc
let spc_eq = del /[ \t]+|[ \t]*=[ \t]*/ " "
let comment = Util.comment
let empty = Util.empty
let comma = Util.del_str ","
let indent = Util.indent
let value_to_eol = store Rx.space_in
let value_to_spc = store /[^ \t\r\n=][^ \t\r\n]*/
let value_to_comma = store /[^, \t\r\n=][^, \t\r\n]*/
(************************************************************************
* Group: ENTRIES
*************************************************************************)
let array_entry (k:regexp) =
[ indent . key k . counter "array_entry"
. [ spc . seq "array_entry" . value_to_spc]* . eol ]
let commas_entry (k:regexp) =
let value = [ seq "commas_entry" . value_to_comma]
in [ indent . key k . counter "commas_entry" . spc_eq .
Build.opt_list value comma . eol ]
let spaces_entry (k:regexp) =
let value = [ seq "spaces_entry" . value_to_spc ]
in [ indent . key k . counter "spaces_entry" . spc_eq .
Build.opt_list value spc . eol ]
let fw_entry (k:regexp) = [ indent . key k . spc_eq .
[ key /[^ \t\r\n\/=][^ \t\r\n\/]*/ . spc . value_to_eol . eol ]]
let send_env = array_entry /SendEnv/i
let proxy_command = [ indent . key /ProxyCommand/i . spc . value_to_eol . eol ]
let remote_fw = fw_entry /RemoteForward/i
let local_fw = fw_entry /LocalForward/i
let ciphers = commas_entry /Ciphers/i
let macs = commas_entry /MACs/i
let algorithms = commas_entry /(HostKey|Kex)Algorithms/i
let pubkey_accepted_key_types = commas_entry /PubkeyAcceptedKeyTypes/i
let global_knownhosts_file = spaces_entry /GlobalKnownHostsFile/i
let rekey_limit = [ indent . key /RekeyLimit/i . spc_eq .
[ label "amount" . value_to_spc ] .
[ spc . label "duration" . value_to_spc ]? . eol ]
let special_entry = send_env
| proxy_command
| remote_fw
| local_fw
| macs
| ciphers
| algorithms
| pubkey_accepted_key_types
| global_knownhosts_file
| rekey_limit
let key_re = /[A-Za-z0-9]+/
- /SendEnv|Host|ProxyCommand|RemoteForward|LocalForward|MACs|Ciphers|(HostKey|Kex)Algorithms|PubkeyAcceptedKeyTypes|GlobalKnownHostsFile|RekeyLimit/i
let other_entry = [ indent . key key_re
. spc_eq . value_to_spc . eol ]
let entry = comment | empty
| special_entry
| other_entry
let host = [ key /Host/i . spc . value_to_eol . eol . entry* ]
(************************************************************************
* Group: LENS
*************************************************************************)
let lns = entry* . host*
let xfm = transform lns (incl "/etc/ssh/ssh_config" .
incl (Sys.getenv("HOME") . "/.ssh/config") .
incl "/etc/ssh/ssh_config.d/*.conf")