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-rw-r--r--gnu/services/ssh.scm96
1 files changed, 79 insertions, 17 deletions
diff --git a/gnu/services/ssh.scm b/gnu/services/ssh.scm
index 2a6c8d45c2..697bb1b82e 100644
--- a/gnu/services/ssh.scm
+++ b/gnu/services/ssh.scm
@@ -28,6 +28,8 @@
#:use-module (gnu system shadow)
#:use-module (guix gexp)
#:use-module (guix records)
+ #:use-module (guix modules)
+ #:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (lsh-configuration
@@ -295,7 +297,11 @@ The other options should be self-descriptive."
(default #t))
;; list of two-element lists
(subsystems openssh-configuration-subsystems
- (default '(("sftp" "internal-sftp")))))
+ (default '(("sftp" "internal-sftp"))))
+
+ ;; list of user-name/file-like tuples
+ (authorized-keys openssh-authorized-keys
+ (default '())))
(define %openssh-accounts
(list (user-group (name "sshd") (system? #t))
@@ -309,22 +315,64 @@ The other options should be self-descriptive."
(define (openssh-activation config)
"Return the activation GEXP for CONFIG."
- #~(begin
- (use-modules (guix build utils))
- (mkdir-p "/etc/ssh")
- (mkdir-p (dirname #$(openssh-configuration-pid-file config)))
-
- (define (touch file-name)
- (call-with-output-file file-name (const #t)))
-
- (let ((lastlog "/var/log/lastlog"))
- (when #$(openssh-configuration-print-last-log? config)
- (unless (file-exists? lastlog)
- (touch lastlog))))
-
- ;; Generate missing host keys.
- (system* (string-append #$(openssh-configuration-openssh config)
- "/bin/ssh-keygen") "-A")))
+ (with-imported-modules '((guix build utils))
+ #~(begin
+ (use-modules (guix build utils))
+
+ (define (touch file-name)
+ (call-with-output-file file-name (const #t)))
+
+ ;; Make sure /etc/ssh can be read by the 'sshd' user.
+ (mkdir-p "/etc/ssh")
+ (chmod "/etc/ssh" #o755)
+ (mkdir-p (dirname #$(openssh-configuration-pid-file config)))
+
+ ;; 'sshd' complains if the authorized-key directory and its parents
+ ;; are group-writable, which rules out /gnu/store. Thus we copy the
+ ;; authorized-key directory to /etc.
+ (catch 'system-error
+ (lambda ()
+ (delete-file-recursively "/etc/authorized_keys.d"))
+ (lambda args
+ (unless (= ENOENT (system-error-errno args))
+ (apply throw args))))
+ (copy-recursively #$(authorized-key-directory
+ (openssh-authorized-keys config))
+ "/etc/ssh/authorized_keys.d")
+
+ (chmod "/etc/ssh/authorized_keys.d" #o555)
+
+ (let ((lastlog "/var/log/lastlog"))
+ (when #$(openssh-configuration-print-last-log? config)
+ (unless (file-exists? lastlog)
+ (touch lastlog))))
+
+ ;; Generate missing host keys.
+ (system* (string-append #$(openssh-configuration-openssh config)
+ "/bin/ssh-keygen") "-A"))))
+
+(define (authorized-key-directory keys)
+ "Return a directory containing the authorized keys specified in KEYS, a list
+of user-name/file-like tuples."
+ (define build
+ (with-imported-modules (source-module-closure '((guix build utils)))
+ #~(begin
+ (use-modules (ice-9 match) (srfi srfi-26)
+ (guix build utils))
+
+ (mkdir #$output)
+ (for-each (match-lambda
+ ((user keys ...)
+ (let ((file (string-append #$output "/" user)))
+ (call-with-output-file file
+ (lambda (port)
+ (for-each (lambda (key)
+ (call-with-input-file key
+ (cut dump-port <> port)))
+ keys))))))
+ '#$keys))))
+
+ (computed-file "openssh-authorized-keys" build))
(define (openssh-config-file config)
"Return the sshd configuration file corresponding to CONFIG."
@@ -367,6 +415,11 @@ The other options should be self-descriptive."
(format port "PrintLastLog ~a\n"
#$(if (openssh-configuration-print-last-log? config)
"yes" "no"))
+
+ ;; Add '/etc/authorized_keys.d/%u', which we populate.
+ (format port "AuthorizedKeysFile \
+ .ssh/authorized_keys .ssh/authorized_keys2 /etc/ssh/authorized_keys.d/%u\n")
+
(for-each
(match-lambda
((name command) (format port "Subsystem\t~a\t~a\n" name command)))
@@ -398,6 +451,13 @@ The other options should be self-descriptive."
#:allow-empty-passwords?
(openssh-configuration-allow-empty-passwords? config))))
+(define (extend-openssh-authorized-keys config keys)
+ "Extend CONFIG with the extra authorized keys listed in KEYS."
+ (openssh-configuration
+ (inherit config)
+ (authorized-keys
+ (append (openssh-authorized-keys config) keys))))
+
(define openssh-service-type
(service-type (name 'openssh)
(extensions
@@ -409,6 +469,8 @@ The other options should be self-descriptive."
openssh-activation)
(service-extension account-service-type
(const %openssh-accounts))))
+ (compose concatenate)
+ (extend extend-openssh-authorized-keys)
(default-value (openssh-configuration))))