Specially for Bernhard Fischer introduce USE_BB_CRYPT

which selects between libc/custom crypt routines.

1 files changed, 55 insertions, 34 deletions

diff --git a/loginutils/Config.in b/loginutils/Config.in
index c57d9976e..e39fb6f79 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -13,45 +13,67 @@ config FEATURE_SHADOWPASSWDS
           readable by root and thus the encrypted passwords are no longer
           publicly readable.
 
+config USE_BB_PWD_GRP
+        bool "Use internal password and group functions rather than system functions"
+        default n
+        help
+          If you leave this disabled, busybox will use the system's password
+          and group functions.  And if you are using the GNU C library
+          (glibc), you will then need to install the /etc/nsswitch.conf
+          configuration file and the required /lib/libnss_* libraries in
+          order for the password and group functions to work.  This generally
+          makes your embedded system quite a bit larger.
+
+          Enabling this option will cause busybox to directly access the
+          system's /etc/password, /etc/group files (and your system will be
+          smaller, and I will get fewer emails asking about how glibc NSS
+          works).  When this option is enabled, you will not be able to use
+          PAM to access remote LDAP password servers and whatnot.  And if you
+          want hostname resolution to work with glibc, you still need the
+          /lib/libnss_* libraries.
+
+          If you need to use glibc's nsswitch.conf mechanism
+          (e.g. if user/group database is NOT stored in /etc/passwd etc),
+          you must NOT use this option.
+
+          If you enable this option, it will add about 1.5k to busybox.
+
 config USE_BB_SHADOW
         bool "Use busybox shadow password functions"
         default y
         depends on USE_BB_PWD_GRP && FEATURE_SHADOWPASSWDS
         help
-            If you leave this disabled, busybox will use the system's shadow
-            password handling functions.  And if you are using the GNU C library
-            (glibc), you will then need to install the /etc/nsswitch.conf
-            configuration file and the required /lib/libnss_* libraries in
-            order for the shadow password functions to work.  This generally
-            makes your embedded system quite a bit larger.
-
-            Enabling this option will cause busybox to directly access the
-            system's /etc/shadow file when handling shadow passwords.  This
-            makes your system smaller and I will get fewer emails asking about
-            how glibc NSS works).  When this option is enabled, you will not be
-            able to use PAM to access shadow passwords from remote LDAP
-            password servers and whatnot.
-
-config USE_BB_PWD_GRP
-        bool "Use internal password and group functions rather than system functions"
-        default n
+          If you leave this disabled, busybox will use the system's shadow
+          password handling functions.  And if you are using the GNU C library
+          (glibc), you will then need to install the /etc/nsswitch.conf
+          configuration file and the required /lib/libnss_* libraries in
+          order for the shadow password functions to work.  This generally
+          makes your embedded system quite a bit larger.
+
+          Enabling this option will cause busybox to directly access the
+          system's /etc/shadow file when handling shadow passwords.  This
+          makes your system smaller and I will get fewer emails asking about
+          how glibc NSS works).  When this option is enabled, you will not be
+          able to use PAM to access shadow passwords from remote LDAP
+          password servers and whatnot.
+
+config USE_BB_CRYPT
+        bool "Use internal DES and MD5 crypt functions rather than system functions"
+        default y
         help
-            If you leave this disabled, busybox will use the system's password
-            and group functions.  And if you are using the GNU C library
-            (glibc), you will then need to install the /etc/nsswitch.conf
-            configuration file and the required /lib/libnss_* libraries in
-            order for the password and group functions to work.  This generally
-            makes your embedded system quite a bit larger.
-
-            Enabling this option will cause busybox to directly access the
-            system's /etc/password, /etc/group files (and your system will be
-            smaller, and I will get fewer emails asking about how glibc NSS
-            works).  When this option is enabled, you will not be able to use
-            PAM to access remote LDAP password servers and whatnot.  And if you
-            want hostname resolution to work with glibc, you still need the
-            /lib/libnss_* libraries.
-
-            If you enable this option, it will add about 1.5k to busybox.
+          If you leave this disabled, busybox will use the system's password
+          and group functions.  Most C libraries use large (~70k)
+          static buffers in these functions, and also combine them
+          with more general DES encryption/decryption routines.
+          For busybox, having large static buffers is undesirable,
+          especially so on NOMMU machines.
+
+          These functions produce results which are identical
+          to corresponding C library functions.
+
+          If you enable this option, it will add about 4.8k to busybox
+          if you are building dynamically linked executable.
+          In static build, it makes executable _smaller_ by about 1.2k.
 
 config ADDGROUP
         bool "addgroup"
@@ -255,4 +277,3 @@ config VLOCK
           work properly.
 
 endmenu
-