71 lines
1.9 KiB
Plaintext
71 lines
1.9 KiB
Plaintext
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(*
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Module: Known_Hosts
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Parses SSH known_hosts files
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Author: Raphaël Pinson <raphink@gmail.com>
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About: Reference
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This lens manages OpenSSH's known_hosts files. See `man 8 sshd` for reference.
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About: License
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This file is licenced under the LGPL v2+, like the rest of Augeas.
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About: Lens Usage
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Sample usage of this lens in augtool:
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* Get a key by name from ssh_known_hosts
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> print /files/etc/ssh_known_hosts/*[.="foo.example.com"]
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...
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* Change a host's key
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> set /files/etc/ssh_known_hosts/*[.="foo.example.com"]/key "newkey"
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About: Configuration files
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This lens applies to SSH known_hosts files. See <filter>.
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*)
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module Known_Hosts =
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autoload xfm
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(* View: marker
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The marker is optional, but if it is present then it must be one of
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“@cert-authority”, to indicate that the line contains a certification
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authority (CA) key, or “@revoked”, to indicate that the key contained
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on the line is revoked and must not ever be accepted.
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Only one marker should be used on a key line.
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*)
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let marker = [ key /@(revoked|cert-authority)/ . Sep.space ]
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(* View: type
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Bits, exponent, and modulus are taken directly from the RSA host key;
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they can be obtained, for example, from /etc/ssh/ssh_host_key.pub.
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The optional comment field continues to the end of the line, and is not used.
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*)
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let type = [ label "type" . store Rx.neg1 ]
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(* View: entry
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A known_hosts entry *)
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let entry =
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let alias = [ label "alias" . store Rx.neg1 ]
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in let key = [ label "key" . store Rx.neg1 ]
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in [ Util.indent . seq "entry" . marker?
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. store Rx.neg1
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. (Sep.comma . Build.opt_list alias Sep.comma)?
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. Sep.space . type . Sep.space . key
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. Util.comment_or_eol ]
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(* View: lns
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The known_hosts lens *)
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let lns = (Util.empty | Util.comment | entry)*
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(* Variable: filter *)
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let filter = incl "/etc/ssh/ssh_known_hosts"
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. incl (Sys.getenv("HOME") . "/.ssh/known_hosts")
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let xfm = transform lns filter
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