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_ADDGROUP_LONG_OPTIONS
101 bool "Enable long options"
103 depends on ADDGROUP && GETOPT_LONG
105 Support long options for the addgroup applet.
107 config FEATURE_ADDUSER_TO_GROUP
108 bool "Support for adding users to groups"
112 If called with two non-option arguments,
113 addgroup will add an existing user to an
120 Utility for deleting a group account.
122 config FEATURE_DEL_USER_FROM_GROUP
123 bool "Support for removing users from groups"
127 If called with two non-option arguments, deluser
128 or delgroup will remove an user from a specified group.
130 config FEATURE_CHECK_NAMES
131 bool "Enable sanity check on user/group names in adduser and addgroup"
133 depends on ADDUSER || ADDGROUP
135 Enable sanity check on user and group names in adduser and addgroup.
136 To avoid problems, the user or group name should consist only of
137 letters, digits, underscores, periods, at signs and dashes,
138 and not start with a dash (as defined by IEEE Std 1003.1-2001).
139 For compatibility with Samba machine accounts "$" is also supported
140 at the end of the user or group name.
146 Utility for creating a new user account.
148 config FEATURE_ADDUSER_LONG_OPTIONS
149 bool "Enable long options"
151 depends on ADDUSER && GETOPT_LONG
153 Support long options for the adduser applet.
159 Utility for deleting a user account.
164 select FEATURE_SYSLOG
166 getty lets you log in on a tty, it is normally invoked by init.
169 bool "Support utmp file"
170 depends on GETTY || LOGIN || SU || WHO
173 The file /var/run/utmp is used to track who is currently logged in.
176 bool "Support wtmp file"
177 depends on GETTY || LOGIN || SU || LAST
181 The file /var/run/wtmp is used to track when user's have logged into
182 and logged out of the system.
188 select FEATURE_SYSLOG
190 login is used when signing onto a system.
192 Note that Busybox binary must be setuid root for this applet to
196 bool "Support for PAM (Pluggable Authentication Modules)"
200 Use PAM in login(1) instead of direct access to password database.
203 bool "Support for login scripts"
207 Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT
208 just prior to switching from root to logged-in user.
210 config FEATURE_NOLOGIN
211 bool "Support for /etc/nologin"
215 The file /etc/nologin is used by (some versions of) login(1).
216 If it exists, non-root logins are prohibited.
218 config FEATURE_SECURETTY
219 bool "Support for /etc/securetty"
223 The file /etc/securetty is used by (some versions of) login(1).
224 The file contains the device names of tty lines (one per line,
225 without leading /dev/) on which root is allowed to login.
231 select FEATURE_SYSLOG
233 passwd changes passwords for user and group accounts. A normal user
234 may only change the password for his/her own account, the super user
235 may change the password for any account. The administrator of a group
236 may change the password for the group.
238 Note that Busybox binary must be setuid root for this applet to
241 config FEATURE_PASSWD_WEAK_CHECK
242 bool "Check new passwords for weakness"
246 With this option passwd will refuse new passwords which are "weak".
252 Encrypts the given password with the crypt(3) libc function
253 using the given salt. Debian has this utility under mkpasswd
254 name. Busybox provides mkpasswd as an alias for cryptpw.
260 Reads a file of user name and password pairs from standard input
261 and uses this information to update a group of existing users.
267 select FEATURE_SYSLOG
269 su is used to become another user during a login session.
270 Invoked without a username, su defaults to becoming the super user.
272 Note that Busybox binary must be setuid root for this applet to
275 config FEATURE_SU_SYSLOG
276 bool "Enable su to write to syslog"
280 config FEATURE_SU_CHECKS_SHELLS
281 bool "Enable su to check user's shell to be listed in /etc/shells"
288 select FEATURE_SYSLOG
290 sulogin is invoked when the system goes into single user
291 mode (this is done through an entry in inittab).
298 Build the "vlock" applet which allows you to lock (virtual) terminals.
300 Note that Busybox binary must be setuid root for this applet to