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;;; auth.scm -- API for SSH user authentication.
;; Copyright (C) 2013, 2014 Artyom V. Poptsov <poptsov.artyom@gmail.com>
;;
;; This file is a part of Guile-SSH.
;;
;; Guile-SSH is free software: you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;;
;; Guile-SSH is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with Guile-SSH. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This module contains API that is used for SSH user authentication.
;;
;; These methods are exported:
;;
;; userauth-public-key!
;; userauth-public-key/auto!
;; userauth-public-key/try
;; userauth-agent!
;; userauth-password!
;; userauth-none!
;; userauth-get-list
;;; Code:
(define-module (ssh auth)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (ssh log)
#:use-module (ssh session)
#:export (userauth-public-key!
userauth-public-key/auto!
userauth-public-key/try
userauth-agent!
userauth-password!
userauth-none!
userauth-get-list
openssh-agent-start
openssh-agent-info
openssh-agent-setenv))
;;;
(define %ssh-auth-sock-regexp
(make-regexp "SSH_AUTH_SOCK=(.*); export SSH_AUTH_SOCK;"))
(define %ssh-agent-pid-regexp
(make-regexp "SSH_AGENT_PID=(.*); export SSH_AGENT_PID;"))
(define (openssh-agent-start)
"Start an OpenSSH agent. Return a list with SSH agent information."
(let ((p (open-input-pipe "ssh-agent -s")))
(let ((ssh-auth-sock-data (read-line p))
(ssh-agent-pid-data (read-line p)))
`((SSH_AUTH_SOCK
. ,(let ((match (regexp-exec %ssh-auth-sock-regexp
ssh-auth-sock-data)))
(match:substring match 1)))
(SSH_AGENT_PID
. ,(let ((match (regexp-exec %ssh-agent-pid-regexp
ssh-agent-pid-data)))
(match:substring match 1)))))))
;;;
(define %ssh-agent-dir-regexp
(make-regexp "ssh-[0-9A-Za-z]+$"))
(define* (openssh-agent-info #:optional (user (getenv "USER")))
"Get OpenSSH agent information for a given USER as a list."
(define (owned-by-user? file-name uid)
(= (stat:uid (stat file-name)) uid))
(define (user->uid user)
(passwd:uid (getpwnam user)))
(define (readdir-3rd dir-name)
(let ((stream (opendir dir-name)))
(readdir stream)
(readdir stream)
(let ((file (readdir stream)))
(closedir stream)
file)))
(define (agent-socket->pid agent-socket)
(cdr (string-split agent-socket #\.)))
(let ((dir (opendir "/tmp"))
(uid (user->uid user)))
(let loop ((entry (readdir dir))
(info '()))
(if (eof-object? entry)
info
(let ((file-name (string-append "/tmp/" entry)))
(if (and (regexp-exec %ssh-agent-dir-regexp entry)
(owned-by-user? file-name uid))
(let ((agent-socket (readdir-3rd file-name)))
(loop (readdir dir)
(cons `(,(string-append file-name "/" agent-socket)
. ,(agent-socket->pid agent-socket))
info)))
(loop (readdir dir) info)))))))
;;;
(define (openssh-agent-setenv)
"Setup openssh agent environment variables for the current user."
(setenv "SSH_AUTH_SOCK" (caar (openssh-agent-info))))
;;;
(load-extension "libguile-ssh" "init_auth_func")
;;; auth.scm ends here.
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