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authorLeo Famulari <leo@famulari.name>2016-06-03 02:44:32 -0400
committerLeo Famulari <leo@famulari.name>2016-06-05 00:06:26 -0400
commit71cb237a7d98dafda7dfbb5f3ba7c68463310383 (patch)
tree574046389347e56289b921257e33f5c0b9eded8c /gnu
parent5d52ac7453e1144086bdc0ac31f01b06edadd04a (diff)
downloadguix-71cb237a7d98dafda7dfbb5f3ba7c68463310383.tar
guix-71cb237a7d98dafda7dfbb5f3ba7c68463310383.tar.gz
services: urandom-seed: Refresh seed at boot.
* gnu/services/base.scm (urandom-seed-shepherd-service): Refresh the random seed unconditionally at boot. Ensure directory structure for %random-seed-file exists when shutting down. (%urandom-seed-activation): Remove variable. (urandom-seed-service-type): Remove deleted variable from list of extensions.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/services/base.scm26
1 files changed, 14 insertions, 12 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index b8e4741739..2780d124c7 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -431,15 +431,6 @@ stopped before 'kill' is called."
(define %random-seed-file
"/var/lib/random-seed")
-(define %urandom-seed-activation
- ;; Activation gexp for the urandom seed
- #~(begin
- (use-modules (guix build utils))
-
- (mkdir-p (dirname #$%random-seed-file))
- (close-port (open-file #$%random-seed-file "a0b"))
- (chmod #$%random-seed-file #o600)))
-
(define (urandom-seed-shepherd-service _)
"Return a shepherd service for the /dev/urandom seed."
(list (shepherd-service
@@ -454,6 +445,18 @@ stopped before 'kill' is called."
(call-with-output-file "/dev/urandom"
(lambda (urandom)
(dump-port seed urandom))))))
+ ;; Immediately refresh the seed in case the system doesn't
+ ;; shut down cleanly.
+ (call-with-input-file "/dev/urandom"
+ (lambda (urandom)
+ (let ((previous-umask (umask #o077))
+ (buf (make-bytevector 512)))
+ (mkdir-p (dirname #$%random-seed-file))
+ (get-bytevector-n! urandom buf 0 512)
+ (call-with-output-file #$%random-seed-file
+ (lambda (seed)
+ (put-bytevector seed buf)))
+ (umask previous-umask))))
#t))
(stop #~(lambda _
;; During shutdown, write from /dev/urandom into random seed.
@@ -462,6 +465,7 @@ stopped before 'kill' is called."
(lambda (urandom)
(let ((previous-umask (umask #o077)))
(get-bytevector-n! urandom buf 0 512)
+ (mkdir-p (dirname #$%random-seed-file))
(call-with-output-file #$%random-seed-file
(lambda (seed)
(put-bytevector seed buf)))
@@ -475,9 +479,7 @@ stopped before 'kill' is called."
(service-type (name 'urandom-seed)
(extensions
(list (service-extension shepherd-root-service-type
- urandom-seed-shepherd-service)
- (service-extension activation-service-type
- (const %urandom-seed-activation))))))
+ urandom-seed-shepherd-service)))))
(define (urandom-seed-service)
(service urandom-seed-service-type #f))