thodg/cl-unix-cybernetics/unix/ssh.lisp

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• Hash : 408808cf
  Author : Thomas de Grivel
  Date : 2022-11-03T21:12:39
  

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• unix/ssh.lisp

• ;; Adams - UNIX system administration tool written in Common Lisp
  ;; Copyright 2013-2022 Thomas de Grivel <thodg@kmx.io>
  
  (in-package :adams)
  
  (in-re-readtable)
  
  (define-resource-class ssh-authorized-key ()
    ()
    ((probe-ssh-authorized-key :properties (:ensure :name :pubkey :type)))
    ((op-ssh-authorized-key :properties (:ensure :name :pubkey :type))))
  
  (define-syntax ssh-public-key (type pubkey name)
      #~|([^\s]+)\s+([^\s]+)\s+(.*)|)
  
  (defun ssh-authorized-key (key)
    (multiple-value-bind (type pubkey name) (parse-ssh-public-key key)
      (resource 'ssh-authorized-key name
                :type type
                :pubkey pubkey
                :name name)))
  
  (defmethod probe-ssh-authorized-key ((res ssh-authorized-key)
                                       (os os-unix))
    (let* ((spec-type (the string (get-specified res :type)))
           (spec-pubkey (the string (get-specified res :pubkey)))
           (user *parent-resource*)
           (home (resource-id (get-probed user :home)))
           (path (str home "/.ssh/authorized_keys"))
           (file (with-parent-resource *host*
                   (resource 'file path)))
           (ensure :absent))
      (multiple-value-bind (type pubkey name)
          (unless (eq :absent (get-probed file :ensure))
            (with-ssh-public-key (type pubkey name)
                (run "cat " (sh-quote path))
              (when (and (string= spec-type (the string type))
                         (string= spec-pubkey (the string pubkey)))
                (setq ensure :present)
                (return (values type pubkey name)))))
        (properties* ensure type pubkey name))))
  
  (defmethod op-ssh-authorized-key ((res ssh-authorized-key)
                                    (os os-unix)
                                    &key ensure type pubkey name)
    (declare (type symbol ensure))
    (let* ((user *parent-resource*)
           (home (resource-id (get-probed user :home)))
           (dot-ssh (str home "/.ssh"))
           (ak (str dot-ssh "/authorized_keys"))
           (sh-ak (sh-quote ak))
           (sh-ak-tmp (sh-quote (str ak ".tmp"))))
      (setf type (get-specified res :type)
            pubkey (get-specified res :pubkey)
            name (get-specified res :name))
      (force-output)
      (when (position ensure '(:absent nil))
        (run "grep -v " (sh-quote pubkey) " " sh-ak " > " sh-ak-tmp)
        (run "mv " sh-ak-tmp " " sh-ak))
      (when (position ensure '(:present nil))
        (run "echo " (sh-quote type " " pubkey " " name) " >> " sh-ak))))
  
  (defmethod resource-additional-specs ((res ssh-authorized-key)
                                        (os os-unix))
    (format t "~& PARENT RESOURCE ~S~%" *parent-resource*)
    (format t "~& HOME ~S~%" (get-specified *parent-resource* :home))
    (force-output)
    (let* ((user *parent-resource*)
           (home (get-specified user :home))
           (ssh-dir (str home "/.ssh"))
           (ak (str ssh-dir "/authorized_keys"))
           (owner (resource-id user))
           (gid (get-probed user :gid)))
      (with-parent-resource *host*
        (resource 'directory ssh-dir
                  :ensure :present
                  :owner owner
                  :gid gid
                  :mode #o700)
        (resource 'file ak
                  :ensure :present
                  :owner owner
                  :gid gid
                  :mode #o600))))
  

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