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[bug#43106] [PATCH v3 2/2] services: childhurd: Support installing secre
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From: |
Jan (janneke) Nieuwenhuizen |
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Subject: |
[bug#43106] [PATCH v3 2/2] services: childhurd: Support installing secrets from the host. |
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Date: |
Mon, 31 Aug 2020 08:39:13 +0200 |
* gnu/system/examples/bare-hurd.tmpl (%hurd-os)[services]: Add secret-service.
* gnu/services/virtualization.scm (%hurd-vm-operating-system): Likewise.
(hurd-vm-shepherd-service): Use it to install secrets.
* doc/guix.texi (The Hurd in a Virtual Machine): Document it.
---
doc/guix.texi | 21 ++++++++++
gnu/services/virtualization.scm | 63 ++++++++++++++++++++++++------
gnu/system/examples/bare-hurd.tmpl | 20 +++++-----
3 files changed, 84 insertions(+), 20 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 6206a93857..8a6ab698e6 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -25119,6 +25119,7 @@ Return the name of @var{platform}---a string such as
@code{"arm"}.
@cindex @code{hurd}
@cindex the Hurd
+@cindex childhurd
Service @code{hurd-vm} provides support for running GNU/Hurd in a
virtual machine (VM), a so-called ``Childhurd''. The virtual machine is
@@ -25191,15 +25192,35 @@ By default, it produces
@lisp
'("--device" "rtl8139,netdev=net0"
"--netdev" "user,id=net0\
+ ,hostfwd=tcp:127.0.0.1:<secrets-port>-:1004\
,hostfwd=tcp:127.0.0.1:<ssh-port>-:2222\
,hostfwd=tcp:127.0.0.1:<vnc-port>-:5900")
@end lisp
with forwarded ports
@example
+<ssh-port>: @code{(+ 11004 (* 1000 @var{ID}))}
<ssh-port>: @code{(+ 10022 (* 1000 @var{ID}))}
<vnc-port>: @code{(+ 15900 (* 1000 @var{ID}))}
@end example
+@item @code{secret-root} (default: @code{#f})
+If set, the root directory with out-of-band secrets to be installed into
+the childhurd once it runs. Childhurds are volatile which means that on
+every startup, secrets such as the SSH host keys and Guix signing key
+are recreated.
+
+Typical use is setting @code{secret-root} to @code{"/etc/childhurd"}
+pointing at a tree of non-volatile secrets like so
+
+@example
+/etc/childhurd/etc/guix/signing-key.pub
+/etc/childhurd/etc/guix/signing-key.sec
+/etc/childhurd/etc/ssh/ssh_host_ed25519_key
+/etc/childhurd/etc/ssh/ssh_host_ecdsa_key
+/etc/childhurd/etc/ssh/ssh_host_ed25519_key.pub
+/etc/childhurd/etc/ssh/ssh_host_ecdsa_key.pub
+@end example
+
@end table
@end deftp
diff --git a/gnu/services/virtualization.scm b/gnu/services/virtualization.scm
index 6d6734dcd1..1fa74f815e 100644
--- a/gnu/services/virtualization.scm
+++ b/gnu/services/virtualization.scm
@@ -39,6 +39,7 @@
#:use-module (gnu system)
#:use-module (guix derivations)
#:use-module (guix gexp)
+ #:use-module (guix modules)
#:use-module (guix monads)
#:use-module (guix packages)
#:use-module (guix records)
@@ -61,7 +62,10 @@
hurd-vm-configuration-options
hurd-vm-configuration-id
hurd-vm-configuration-net-options
+ hurd-vm-configuration-secrets
+
hurd-vm-disk-image
+ hurd-vm-port
hurd-vm-net-options
hurd-vm-service-type
@@ -846,6 +850,8 @@ can only be accessed by their host.")))
(target "/dev/vda")
(timeout 0)))
(services (cons*
+ ;; Receive secret keys on port 1004, TCP.
+ (service secret-service-type 1004)
(service openssh-service-type
(openssh-configuration
(openssh openssh-sans-x)
@@ -876,7 +882,9 @@ can only be accessed by their host.")))
(default #f))
(net-options hurd-vm-configuration-net-options ;list of string
(thunked)
- (default (hurd-vm-net-options this-record))))
+ (default (hurd-vm-net-options this-record)))
+ (secret-root hurd-vm-configuration-secret-root ;#f or string
+ (default #f)))
(define (hurd-vm-disk-image config)
"Return a disk-image for the Hurd according to CONFIG."
@@ -888,15 +896,27 @@ can only be accessed by their host.")))
(size disk-size)
(operating-system os)))))
-(define (hurd-vm-net-options config)
+(define (hurd-vm-port config base)
+ "Return the forwarded vm port for this childhurd config."
(let ((id (or (hurd-vm-configuration-id config) 0)))
- (define (qemu-vm-port base)
- (number->string (+ base (* 1000 id))))
- `("--device" "rtl8139,netdev=net0"
- "--netdev" ,(string-append
- "user,id=net0"
- ",hostfwd=tcp:127.0.0.1:" (qemu-vm-port 10022) "-:2222"
- ",hostfwd=tcp:127.0.0.1:" (qemu-vm-port 15900) "-:5900"))))
+ (+ base (* 1000 id))))
+(define %hurd-vm-secrets-port 11004)
+(define %hurd-vm-ssh-port 10022)
+(define %hurd-vm-vnc-port 15900)
+
+(define (hurd-vm-net-options config)
+ `("--device" "rtl8139,netdev=net0"
+ "--netdev"
+ ,(string-append "user,id=net0"
+ ",hostfwd=tcp:127.0.0.1:"
+ (number->string (hurd-vm-port config
%hurd-vm-secrets-port))
+ "-:1004"
+ ",hostfwd=tcp:127.0.0.1:"
+ (number->string (hurd-vm-port config %hurd-vm-ssh-port))
+ "-:2222"
+ ",hostfwd=tcp:127.0.0.1:"
+ (number->string (hurd-vm-port config %hurd-vm-vnc-port))
+ "-:5900")))
(define (hurd-vm-shepherd-service config)
"Return a <shepherd-service> for a Hurd in a Virtual Machine with CONFIG."
@@ -927,8 +947,29 @@ can only be accessed by their host.")))
(string->symbol (number->string id)))
provisions)
provisions))
- (requirement '(networking))
- (start #~(make-forkexec-constructor #$vm-command))
+ (requirement '(loopback networking user-processes))
+ (start
+ (with-imported-modules
+ (source-module-closure '((gnu build secret-service)
+ (guix build utils)))
+ #~(let ((spawn (make-forkexec-constructor #$vm-command)))
+ (lambda _
+ (let ((pid (spawn))
+ (port #$(hurd-vm-port config %hurd-vm-secrets-port))
+ (root #$(hurd-vm-configuration-secret-root config)))
+ (and root (directory-exists? root)
+ (catch #t
+ (lambda _
+ (secret-service-send-secrets port root))
+ (lambda (keys . args)
+ (format (current-error-port)
+ "failed to send secrets: ~a ~s\n" key args)
+ (kill pid)
+ #f))
+ pid))))))
+ (modules `((gnu build secret-service)
+ (guix build utils)
+ ,@%default-modules))
(stop #~(make-kill-destructor))))))
(define hurd-vm-service-type
diff --git a/gnu/system/examples/bare-hurd.tmpl
b/gnu/system/examples/bare-hurd.tmpl
index 414a9379c8..2d00a7c8bb 100644
--- a/gnu/system/examples/bare-hurd.tmpl
+++ b/gnu/system/examples/bare-hurd.tmpl
@@ -41,14 +41,16 @@
(host-name "guixygnu")
(timezone "Europe/Amsterdam")
(packages (cons openssh-sans-x %base-packages/hurd))
- (services (cons (service openssh-service-type
- (openssh-configuration
- (openssh openssh-sans-x)
- (use-pam? #f)
- (port-number 2222)
- (permit-root-login #t)
- (allow-empty-passwords? #t)
- (password-authentication? #t)))
- %base-services/hurd))))
+ (services (append (list (service openssh-service-type
+ (openssh-configuration
+ (openssh openssh-sans-x)
+ (use-pam? #f)
+ (port-number 2222)
+ (permit-root-login #t)
+ (allow-empty-passwords? #t)
+ (password-authentication? #t)))
+ (service (@@ (gnu services virtualization)
+ secret-service-type) 5999))
+ %base-services/hurd))))
%hurd-os
--
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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