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services: openssh: Enable PAM.

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* gnu/services/ssh.scm: (openssh-pam-services): New procedure.
(openssh-service-type): Use it to extend PAM-ROOT-SERVICE-TYPE.
(<openssh-configuration>)[challenge-response-authentication?]: New field.
(<openssh-configuration>)[use-pam?]: New field.
(openssh-config-file): Add them.
* doc/guix.texi (Networking Services): Document them.

Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>
This commit is contained in:
Clément Lassieur 2017-03-02 22:06:27 +01:00 committed by Danny Milosavljevic
parent 856be82323
commit 563c5d42c9
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2 changed files with 36 additions and 1 deletions
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16
doc/guix.texi
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@ -9344,6 +9344,22 @@ enabled---in other words, @command{ssh} options @option{-X} and
@item @code{protocol-number} (default: @code{2})
The SSH protocol number to use.
@item @code{challenge-response-authentication?} (default: @code{#f})
Specifies whether challenge response authentication is allowed (e.g. via
PAM).
@item @code{use-pam?} (default: @code{#t})
Enables the Pluggable Authentication Module interface. If set to
@code{#t}, this will enable PAM authentication using
@code{challenge-response-authentication?} and
@code{password-authentication?}, in addition to PAM account and session
module processing for all authentication types.
Because PAM challenge response authentication usually serves an
equivalent role to password authentication, you should disable either
@code{challenge-response-authentication?} or
@code{password-authentication?}.
@end table
@end deftp

21
gnu/services/ssh.scm
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@ -279,7 +279,11 @@ The other options should be self-descriptive."
(x11-forwarding? openssh-configuration-x11-forwarding? ;Boolean
(default #f))
(protocol-number openssh-configuration-protocol-number ;integer
(default 2)))
(default 2))
(challenge-response-authentication? openssh-challenge-response-authentication?
(default #f)) ;Boolean
(use-pam? openssh-configuration-use-pam?
(default #t))) ;Boolean
(define %openssh-accounts
(list (user-group (name "sshd") (system? #t))
@ -336,6 +340,12 @@ The other options should be self-descriptive."
"yes" "no"))
(format port "PidFile ~a\n"
#$(openssh-configuration-pid-file config))
(format port "ChallengeResponseAuthentication ~a\n"
#$(if (openssh-challenge-response-authentication? config)
"yes" "no"))
(format port "UsePAM ~a\n"
#$(if (openssh-configuration-use-pam? config)
"yes" "no"))
#t))))
(define (openssh-shepherd-service config)
@ -356,11 +366,20 @@ The other options should be self-descriptive."
#:pid-file #$pid-file))
(stop #~(make-kill-destructor)))))
(define (openssh-pam-services config)
"Return a list of <pam-services> for sshd with CONFIG."
(list (unix-pam-service
"sshd"
#:allow-empty-passwords?
(openssh-configuration-allow-empty-passwords? config))))
(define openssh-service-type
(service-type (name 'openssh)
(extensions
(list (service-extension shepherd-root-service-type
openssh-shepherd-service)
(service-extension pam-root-service-type
openssh-pam-services)
(service-extension activation-service-type
openssh-activation)
(service-extension account-service-type