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ssh: 'open-ssh-session' can be passed the expected host key.

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* guix/ssh.scm (open-ssh-session): Add #:host-key parameter.
Pass #:knownhosts to 'make-session'.  When HOST-KEY is true, call
'authenticate-server*' instead of 'authenticate-server'.
This commit is contained in:
Ludovic Courtès 2019-12-03 21:48:02 +01:00
parent f5c180180e
commit 2b8682841d
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 27 additions and 12 deletions
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guix/ssh.scm
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@ -98,14 +98,20 @@ actual key does not match."
key type))))))))
(define* (open-ssh-session host #:key user port identity
host-key
(compression %compression)
(timeout 3600))
"Open an SSH session for HOST and return it. IDENTITY specifies the file
name of a private key to use for authenticating with the host. When USER,
PORT, or IDENTITY are #f, use default values or whatever '~/.ssh/config'
specifies; otherwise use them. Install TIMEOUT as the maximum time in seconds
after which a read or write operation on a channel of the returned session is
considered as failing.
specifies; otherwise use them.
When HOST-KEY is true, it must be a string like \"ssh-ed25519 AAAAC3Nz…
root@example.org\"; the server is authenticated and an error is raised if its
host key is different from HOST-KEY.
Install TIMEOUT as the maximum time in seconds after which a read or write
operation on a channel of the returned session is considered as failing.
Throw an error on failure."
(let ((session (make-session #:user user
@ -115,6 +121,11 @@ Throw an error on failure."
#:timeout 10 ;seconds
;; #:log-verbosity 'protocol
;; Prevent libssh from reading
;; ~/.ssh/known_hosts when the caller provides
;; a HOST-KEY to match against.
#:knownhosts (and host-key "/dev/null")
;; We need lightweight compression when
;; exchanging full archives.
#:compression compression
@ -125,16 +136,20 @@ Throw an error on failure."
(match (connect! session)
('ok
;; Authenticate against ~/.ssh/known_hosts.
(match (authenticate-server session)
('ok #f)
(reason
(raise (condition
(&message
(message (format #f (G_ "failed to authenticate \
(if host-key
;; Make sure the server's key is what we expect.
(authenticate-server* session host-key)
;; Authenticate against ~/.ssh/known_hosts.
(match (authenticate-server session)
('ok #f)
(reason
(raise (condition
(&message
(message (format #f (G_ "failed to authenticate \
server at '~a': ~a")
(session-get session 'host)
reason)))))))
(session-get session 'host)
reason))))))))
;; Use public key authentication, via the SSH agent if it's available.
(match (userauth-public-key/auto! session)