2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Login/Password Management Utilities"
8 config FEATURE_SHADOWPASSWDS
9 bool "Support for 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.
98 Utility for creating a new group account.
100 config FEATURE_ADDUSER_TO_GROUP
101 bool "Support for adding users to groups"
105 If called with two non-option arguments,
106 addgroup will add an existing user to an
113 Utility for deleting a group account.
115 config FEATURE_DEL_USER_FROM_GROUP
116 bool "Support for removing users from groups"
120 If called with two non-option arguments, deluser
121 or delgroup will remove an user from a specified group.
123 config FEATURE_CHECK_NAMES
124 bool "Enable sanity check on user/group names in adduser and addgroup"
126 depends on ADDUSER || ADDGROUP
128 Enable sanity check on user and group names in adduser and addgroup.
129 To avoid problems, the user or group name should consist only of
130 letters, digits, underscores, periods, at signs and dashes,
131 and not start with a dash (as defined by IEEE Std 1003.1-2001).
132 For compatibility with Samba machine accounts "$" is also supported
133 at the end of the user or group name.
139 Utility for creating a new user account.
141 config FEATURE_ADDUSER_LONG_OPTIONS
142 bool "Enable long options"
144 depends on ADDUSER && GETOPT_LONG
146 Support long options for the adduser applet.
152 Utility for deleting a user account.
157 select FEATURE_SYSLOG
159 getty lets you log in on a tty, it is normally invoked by init.
162 bool "Support utmp file"
163 depends on GETTY || LOGIN || SU || WHO
166 The file /var/run/utmp is used to track who is currently logged in.
169 bool "Support wtmp file"
170 depends on GETTY || LOGIN || SU || LAST
174 The file /var/run/wtmp is used to track when user's have logged into
175 and logged out of the system.
181 select FEATURE_SYSLOG
183 login is used when signing onto a system.
185 Note that Busybox binary must be setuid root for this applet to
189 bool "Support for PAM (Pluggable Authentication Modules)"
193 Use PAM in login(1) instead of direct access to password database.
196 bool "Support for login scripts"
200 Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT
201 just prior to switching from root to logged-in user.
203 config FEATURE_NOLOGIN
204 bool "Support for /etc/nologin"
208 The file /etc/nologin is used by (some versions of) login(1).
209 If it exists, non-root logins are prohibited.
211 config FEATURE_SECURETTY
212 bool "Support for /etc/securetty"
216 The file /etc/securetty is used by (some versions of) login(1).
217 The file contains the device names of tty lines (one per line,
218 without leading /dev/) on which root is allowed to login.
224 select FEATURE_SYSLOG
226 passwd changes passwords for user and group accounts. A normal user
227 may only change the password for his/her own account, the super user
228 may change the password for any account. The administrator of a group
229 may change the password for the group.
231 Note that Busybox binary must be setuid root for this applet to
234 config FEATURE_PASSWD_WEAK_CHECK
235 bool "Check new passwords for weakness"
239 With this option passwd will refuse new passwords which are "weak".
245 Applet for crypting a string.
251 chpasswd reads a file of user name and password pairs from
252 standard input and uses this information to update a group of
259 select FEATURE_SYSLOG
261 su is used to become another user during a login session.
262 Invoked without a username, su defaults to becoming the super user.
264 Note that Busybox binary must be setuid root for this applet to
267 config FEATURE_SU_SYSLOG
268 bool "Enable su to write to syslog"
272 config FEATURE_SU_CHECKS_SHELLS
273 bool "Enable su to check user's shell to be listed in /etc/shells"
280 select FEATURE_SYSLOG
282 sulogin is invoked when the system goes into single user
283 mode (this is done through an entry in inittab).
290 Build the "vlock" applet which allows you to lock (virtual) terminals.
292 Note that Busybox binary must be setuid root for this applet to