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#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
menu "Login/Password Management Utilities"
config FEATURE_SHADOWPASSWDS
bool "Support for shadow passwords"
default y
help
Build support for shadow password in /etc/shadow. This file is only
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 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 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.
config USE_BB_SHADOW
bool "Use internal 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_CRYPT
bool "Use internal crypt functions"
default y
help
Busybox has internal DES and MD5 crypt functions.
They produce results which are identical to corresponding
standard C library functions.
If you leave this disabled, busybox will use the system's
crypt functions. Most C libraries use large (~70k)
static buffers there, and also combine them with more general
DES encryption/decryption.
For busybox, having large static buffers is undesirable,
especially on NOMMU machines. Busybox also doesn't need
DES encryption/decryption and can do with smaller code.
If you enable this option, it will add about 4.8k of code
if you are building dynamically linked executable.
In static build, it makes code _smaller_ by about 1.2k,
and likely many kilobytes less of bss.
config USE_BB_CRYPT_SHA
bool "Enable SHA256/512 crypt functions"
default y
depends on USE_BB_CRYPT
help
Enable this if you have passwords starting with "$5$" or "$6$"
in your /etc/passwd or /etc/shadow files. These passwords
are hashed using SHA256 and SHA512 algorithms. Support for them
was added to glibc in 2008.
With this option off, login will fail password check for any
user which has password encrypted with these algorithms.
INSERT
endmenu
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