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authorLudovic Courtès <ludo@gnu.org>2020-10-21 16:17:26 +0200
committerLudovic Courtès <ludo@gnu.org>2020-10-25 01:06:10 +0200
commit3b6e4e5fd05e72b8a32ff1a2d5e21464260e21e6 (patch)
tree023dbe227eae82d4e01201478b577291e8780f0e /gnu
parente220b77828e9a4ccf5748771b6d61be7a3c84dae (diff)
downloadguix-3b6e4e5fd05e72b8a32ff1a2d5e21464260e21e6.tar.gz
services: guix: Make /etc/guix/acl really declarative by default.
Fixes <https://bugs.gnu.org/39819>.
Reported by Maxim Cournoyer <maxim.cournoyer@gmail.com>.

* gnu/services/base.scm (substitute-key-authorization): Symlink
DEFAULT-ACL to /etc/guix/acl unconditionally.  Add code to optionally
back up /etc/guix/acl if it was possibly modified by hand.
* doc/guix.texi (Base Services): Clarify the effect of setting
'authorize-keys?' to true.  Mention the backup.  Give an example showing
how to authorize substitutes from another server.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/services/base.scm16
-rw-r--r--gnu/services/virtualization.scm11
2 files changed, 22 insertions, 5 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 04bc991356..37b0a13ea7 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1476,10 +1476,18 @@ archive' public keys, with GUIX."
     #~(begin
         (use-modules (guix build utils))
 
-        (unless (file-exists? "/etc/guix/acl")
-          (mkdir-p "/etc/guix")
-          (copy-file #+default-acl "/etc/guix/acl")
-          (chmod "/etc/guix/acl" #o600)))))
+        ;; If the ACL already exists, move it out of the way.  Create a backup
+        ;; if it's a regular file: it's likely that the user manually updated
+        ;; it with 'guix archive --authorize'.
+        (if (file-exists? "/etc/guix/acl")
+            (if (and (symbolic-link? "/etc/guix/acl")
+                     (store-file-name? (readlink "/etc/guix/acl")))
+                (delete-file "/etc/guix/acl")
+                (rename-file "/etc/guix/acl" "/etc/guix/acl.bak"))
+            (mkdir-p "/etc/guix"))
+
+        ;; Installed the declared ACL.
+        (symlink #+default-acl "/etc/guix/acl"))))
 
 (define %default-authorized-guix-keys
   ;; List of authorized substitute keys.
diff --git a/gnu/services/virtualization.scm b/gnu/services/virtualization.scm
index edd0b644f5..eaf0bbde43 100644
--- a/gnu/services/virtualization.scm
+++ b/gnu/services/virtualization.scm
@@ -875,7 +875,16 @@ that will be listening to receive secret keys on port 1004, TCP."
                          (permit-root-login #t)
                          (allow-empty-passwords? #t)
                          (password-authentication? #t)))
-               %base-services/hurd))))
+
+               ;; By default, the secret service introduces a pre-initialized
+               ;; /etc/guix/acl file in the childhurd.  Thus, clear
+               ;; 'authorize-key?' so that it's not overridden at activation
+               ;; time.
+               (modify-services %base-services/hurd
+                 (guix-service-type config =>
+                                    (guix-configuration
+                                     (inherit config)
+                                     (authorize-key? #f))))))))
 
 (define-record-type* <hurd-vm-configuration>
   hurd-vm-configuration make-hurd-vm-configuration