summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRicardo Wurmus <rekado@elephly.net>2017-05-08 12:21:02 +0200
committerRicardo Wurmus <rekado@elephly.net>2017-05-08 23:11:01 +0200
commite586257b550918fefaab3970f2c314d6285f54ab (patch)
treedf99895dcb045694c197ad623e0077c9c0f3a030
parentf000828575d6fe16e774162051d29b9ed025414d (diff)
system: Allow root to run "su" without password.
* gnu/system/pam.scm (unix-pam-service): Add pam-entry for "pam_rootok.so" to auth field when ALLOW-ROOT? is #T. (base-pam-services): Allow root to run "su" without authentication.
-rw-r--r--gnu/system/pam.scm31
1 files changed, 21 insertions, 10 deletions
diff --git a/gnu/system/pam.scm b/gnu/system/pam.scm
index 4546c1a73a..eedf933946 100644
--- a/gnu/system/pam.scm
+++ b/gnu/system/pam.scm
@@ -204,21 +204,27 @@ dumped in /etc/pam.d/NAME, where NAME is the name of SERVICE."
(env (pam-entry ; to honor /etc/environment.
(control "required")
(module "pam_env.so"))))
- (lambda* (name #:key allow-empty-passwords? motd)
+ (lambda* (name #:key allow-empty-passwords? (allow-root? #f) motd)
"Return a standard Unix-style PAM service for NAME. When
-ALLOW-EMPTY-PASSWORDS? is true, allow empty passwords. When MOTD is true, it
-should be a file-like object used as the message-of-the-day."
+ALLOW-EMPTY-PASSWORDS? is true, allow empty passwords. When ALLOW-ROOT? is
+true, allow root to run the command without authentication. When MOTD is
+true, it should be a file-like object used as the message-of-the-day."
;; See <http://www.linux-pam.org/Linux-PAM-html/sag-configuration-example.html>.
(let ((name* name))
(pam-service
(name name*)
(account (list unix))
- (auth (list (if allow-empty-passwords?
- (pam-entry
- (control "required")
- (module "pam_unix.so")
- (arguments '("nullok")))
- unix)))
+ (auth (append (if allow-root?
+ (list (pam-entry
+ (control "sufficient")
+ (module "pam_rootok.so")))
+ '())
+ (list (if allow-empty-passwords?
+ (pam-entry
+ (control "required")
+ (module "pam_unix.so")
+ (arguments '("nullok")))
+ unix))))
(password (list (pam-entry
(control "required")
(module "pam_unix.so")
@@ -256,7 +262,12 @@ authenticate to run COMMAND."
;; These programs are setuid-root.
(map (cut unix-pam-service <>
#:allow-empty-passwords? allow-empty-passwords?)
- '("su" "passwd" "sudo"))
+ '("passwd" "sudo"))
+ ;; This is setuid-root, as well. Allow root to run "su" without
+ ;; authenticating.
+ (list (unix-pam-service "su"
+ #:allow-empty-passwords? allow-empty-passwords?
+ #:allow-root? #t))
;; These programs are not setuid-root, and we want root to be able
;; to run them without having to authenticate (notably because