adduser/addgroup: check username for invalid chars

(by Tito <farmatito AT tiscali.it>). +129 bytes when enabled.

1 files changed, 12 insertions, 0 deletions

diff --git a/loginutils/Config.in b/loginutils/Config.in
index 81d05ef89..c57d9976e 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -82,6 +82,18 @@ config FEATURE_DEL_USER_FROM_GROUP
           If called with two non-option arguments, deluser
           or delgroup will remove an user from a specified group.
 
+config FEATURE_CHECK_NAMES
+        bool "Enable sanity check on user/group names in adduser and addgroup"
+        default n
+        depends on ADDUSER || ADDGROUP
+        help
+          Enable sanity check on user and group names in adduser and addgroup.
+          To avoid problems, the user or group name should consist only of
+          letters, digits, underscores, periods, at signs and dashes,
+          and not start with a dash (as defined by IEEE Std 1003.1-2001).
+          For compatibility with Samba machine accounts "$" is also supported
+          at the end of the user or group name.
+
 config ADDUSER
         bool "adduser"
         default n