152 lines
4.1 KiB
Plaintext
152 lines
4.1 KiB
Plaintext
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(*
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Module: Sshd
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Parses /etc/ssh/sshd_config
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Author: David Lutterkort lutter@redhat.com
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Dominique Dumont dominique.dumont@hp.com
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About: Reference
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sshd_config man page.
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See http://www.openbsd.org/cgi-bin/man.cgi?query=sshd_config&sektion=5
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About: License
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This file is licensed under the LGPL v2+.
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About: Lens Usage
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Sample usage of this lens in augtool:
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* Get your current setup
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> print /files/etc/ssh/sshd_config
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...
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* Set X11Forwarding to "no"
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> set /files/etc/ssh/sshd_config/X11Forwarding "no"
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More advanced usage:
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* Set a Match section
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> set /files/etc/ssh/sshd_config/Match[1]/Condition/User "foo"
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> set /files/etc/ssh/sshd_config/Match[1]/Settings/X11Forwarding "yes"
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Saving your file:
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> save
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About: CAVEATS
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In sshd_config, Match blocks must be located at the end of the file.
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This means that any new "global" parameters (i.e. outside of a Match
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block) must be written before the first Match block. By default,
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Augeas will write new parameters at the end of the file.
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I.e. if you have a Match section and no ChrootDirectory parameter,
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this command:
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> set /files/etc/ssh/sshd_config/ChrootDirectory "foo"
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will be stored in a new node after the Match section and Augeas will
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refuse to save sshd_config file.
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To create a new parameter as the right place, you must first create
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a new Augeas node before the Match section:
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> ins ChrootDirectory before /files/etc/ssh/sshd_config/Match
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Then, you can set the parameter
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> set /files/etc/ssh/sshd_config/ChrootDirectory "foo"
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About: Configuration files
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This lens applies to /etc/ssh/sshd_config
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*)
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module Sshd =
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autoload xfm
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let eol = del /[ \t]*\n/ "\n"
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let sep = del /[ \t=]+/ " "
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let indent = del /[ \t]*/ " "
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let key_re = /[A-Za-z0-9]+/
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- /MACs|Match|AcceptEnv|Subsystem|Ciphers|(Kex|HostKey)Algorithms|(Allow|Deny)(Groups|Users)/i
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let comment = Util.comment
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let comment_noindent = Util.comment_noindent
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let empty = Util.empty
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let array_entry (kw:regexp) (sq:string) =
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let bare = Quote.do_quote_opt_nil (store /[^"' \t\n=]+/) in
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let quoted = Quote.do_quote (store /[^"'\n]*[ \t]+[^"'\n]*/) in
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[ key kw
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. ( [ sep . seq sq . bare ] | [ sep . seq sq . quoted ] )*
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. eol ]
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let other_entry =
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let value = store /[^ \t\n=]+([ \t=]+[^ \t\n=]+)*/ in
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[ key key_re . sep . value . eol ]
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let accept_env = array_entry /AcceptEnv/i "AcceptEnv"
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let allow_groups = array_entry /AllowGroups/i "AllowGroups"
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let allow_users = array_entry /AllowUsers/i "AllowUsers"
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let deny_groups = array_entry /DenyGroups/i "DenyGroups"
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let deny_users = array_entry /DenyUsers/i "DenyUsers"
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let subsystemvalue =
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let value = store (/[^ \t\n=](.*[^ \t\n=])?/) in
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[ key /[A-Za-z0-9\-]+/ . sep . value . eol ]
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let subsystem =
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[ key /Subsystem/i . sep . subsystemvalue ]
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let list (kw:regexp) (sq:string) =
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let value = store /[^, \t\n=]+/ in
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[ key kw . sep .
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[ seq sq . value ] .
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([ seq sq . Util.del_str "," . value])* .
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eol ]
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let macs = list /MACs/i "MACs"
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let ciphers = list /Ciphers/i "Ciphers"
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let kexalgorithms = list /KexAlgorithms/i "KexAlgorithms"
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let hostkeyalgorithms = list /HostKeyAlgorithms/i "HostKeyAlgorithms"
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let entry = accept_env | allow_groups | allow_users
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| deny_groups | subsystem | deny_users
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| macs | ciphers | kexalgorithms | hostkeyalgorithms
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| other_entry
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let condition_entry =
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let k = /[A-Za-z0-9]+/ in
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let no_spc = Quote.do_dquote_opt (store /[^"' \t\n=]+/) in
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let spc = Quote.do_quote (store /[^"'\t\n]* [^"'\t\n]*/) in
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[ sep . key k . sep . no_spc ]
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| [ sep . key k . sep . spc ]
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let match_cond =
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[ label "Condition" . condition_entry+ . eol ]
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let match_entry = indent . (entry | comment_noindent)
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| empty
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let match =
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[ key /Match/i . match_cond
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. [ label "Settings" . match_entry+ ]
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]
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let lns = (entry | comment | empty)* . match*
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let xfm = transform lns (incl "/etc/ssh/sshd_config")
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(* Local Variables: *)
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(* mode: caml *)
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(* End: *)
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