2 # For a description of the syntax of this configuration file,
3 # see docs/Kconfig-language.txt.
6 menu "Login/Password Management Utilities"
8 config FEATURE_SHADOWPASSWDS
9 bool "Support shadow passwords"
12 Build support for shadow password in /etc/shadow. This file is only
13 readable by root and thus the encrypted passwords are no longer
17 bool "Use internal password and group functions rather than system functions"
20 If you leave this disabled, busybox will use the system's password
21 and group functions. And if you are using the GNU C library
22 (glibc), you will then need to install the /etc/nsswitch.conf
23 configuration file and the required /lib/libnss_* libraries in
24 order for the password and group functions to work. This generally
25 makes your embedded system quite a bit larger.
27 Enabling this option will cause busybox to directly access the
28 system's /etc/password, /etc/group files (and your system will be
29 smaller, and I will get fewer emails asking about how glibc NSS
30 works). When this option is enabled, you will not be able to use
31 PAM to access remote LDAP password servers and whatnot. And if you
32 want hostname resolution to work with glibc, you still need the
33 /lib/libnss_* libraries.
35 If you need to use glibc's nsswitch.conf mechanism
36 (e.g. if user/group database is NOT stored in /etc/passwd etc),
37 you must NOT use this option.
39 If you enable this option, it will add about 1.5k.
42 bool "Use internal shadow password functions"
44 depends on USE_BB_PWD_GRP && FEATURE_SHADOWPASSWDS
46 If you leave this disabled, busybox will use the system's shadow
47 password handling functions. And if you are using the GNU C library
48 (glibc), you will then need to install the /etc/nsswitch.conf
49 configuration file and the required /lib/libnss_* libraries in
50 order for the shadow password functions to work. This generally
51 makes your embedded system quite a bit larger.
53 Enabling this option will cause busybox to directly access the
54 system's /etc/shadow file when handling shadow passwords. This
55 makes your system smaller (and I will get fewer emails asking about
56 how glibc NSS works). When this option is enabled, you will not be
57 able to use PAM to access shadow passwords from remote LDAP
58 password servers and whatnot.
61 bool "Use internal crypt functions"
64 Busybox has internal DES and MD5 crypt functions.
65 They produce results which are identical to corresponding
66 standard C library functions.
68 If you leave this disabled, busybox will use the system's
69 crypt functions. Most C libraries use large (~70k)
70 static buffers there, and also combine them with more general
71 DES encryption/decryption.
73 For busybox, having large static buffers is undesirable,
74 especially on NOMMU machines. Busybox also doesn't need
75 DES encryption/decryption and can do with smaller code.
77 If you enable this option, it will add about 4.8k of code
78 if you are building dynamically linked executable.
79 In static build, it makes code _smaller_ by about 1.2k,
80 and likely many kilobytes less of bss.
82 config USE_BB_CRYPT_SHA
83 bool "Enable SHA256/512 crypt functions"
85 depends on USE_BB_CRYPT
87 Enable this if you have passwords starting with "$5$" or "$6$"
88 in your /etc/passwd or /etc/shadow files. These passwords
89 are hashed using SHA256 and SHA512 algorithms. Support for them
90 was added to glibc in 2008.
91 With this option off, login will fail password check for any
92 user which has password encrypted with these algorithms.