# # For a description of the syntax of this configuration file, # see scripts/kbuild/config-language.txt. # menu "Login/Password Management Utilities" INSERT 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. config ADDUSER bool "adduser" default y help Utility for creating a new user account. config FEATURE_ADDUSER_LONG_OPTIONS bool "Enable long options" default y depends on ADDUSER && LONG_OPTS help Support long options for the adduser applet. config FEATURE_CHECK_NAMES bool "Enable sanity check on user/group names in adduser and addgroup" default n depends on ADDUSER || ADDGROUP help Enable sanity check on user and group names in adduser and addgroup. To avoid problems, the user or group name should consist only of letters, digits, underscores, periods, at signs and dashes, and not start with a dash (as defined by IEEE Std 1003.1-2001). For compatibility with Samba machine accounts "$" is also supported at the end of the user or group name. config FIRST_SYSTEM_ID int "First valid system uid or gid for adduser and addgroup" depends on ADDUSER || ADDGROUP range 0 64900 default 100 help First valid system uid or gid for adduser and addgroup config LAST_SYSTEM_ID int "Last valid system uid or gid for adduser and addgroup" depends on ADDUSER || ADDGROUP range 0 64900 default 999 help Last valid system uid or gid for adduser and addgroup config ADDGROUP bool "addgroup" default y help Utility for creating a new group account. config FEATURE_ADDGROUP_LONG_OPTIONS bool "Enable long options" default y depends on ADDGROUP && LONG_OPTS help Support long options for the addgroup applet. config FEATURE_ADDUSER_TO_GROUP bool "Support for adding users to groups" default y depends on ADDGROUP help If called with two non-option arguments, addgroup will add an existing user to an existing group. config DELUSER bool "deluser" default y help Utility for deleting a user account. config DELGROUP bool "delgroup" default y help Utility for deleting a group account. config FEATURE_DEL_USER_FROM_GROUP bool "Support for removing users from groups" default y depends on DELGROUP help If called with two non-option arguments, deluser or delgroup will remove an user from a specified group. config GETTY bool "getty" default y select FEATURE_SYSLOG help getty lets you log in on a tty. It is normally invoked by init. Note that you can save a few bytes by disabling it and using login applet directly. If you need to reset tty attributes before calling login, this script approximates getty: exec /dev/$1 2>&1 || exit 1 reset stty sane; stty ispeed 38400; stty ospeed 38400 printf "%s login: " "`hostname`" read -r login exec /bin/login "$login" config LOGIN bool "login" default y select FEATURE_SYSLOG help login is used when signing onto a system. Note that Busybox binary must be setuid root for this applet to work properly. config LOGIN_SESSION_AS_CHILD bool "Run logged in session in a child process" default y if PAM depends on LOGIN help Run the logged in session in a child process. This allows login to clean up things such as utmp entries or PAM sessions when the login session is complete. If you use PAM, you almost always would want this to be set to Y, else PAM session will not be cleaned up. config PAM bool "Support for PAM (Pluggable Authentication Modules)" default n depends on LOGIN help Use PAM in login(1) instead of direct access to password database. config LOGIN_SCRIPTS bool "Support for login scripts" depends on LOGIN default y help Enable this if you want login to execute $LOGIN_PRE_SUID_SCRIPT just prior to switching from root to logged-in user. config FEATURE_NOLOGIN bool "Support for /etc/nologin" default y depends on LOGIN help The file /etc/nologin is used by (some versions of) login(1). If it exists, non-root logins are prohibited. config FEATURE_SECURETTY bool "Support for /etc/securetty" default y depends on LOGIN help The file /etc/securetty is used by (some versions of) login(1). The file contains the device names of tty lines (one per line, without leading /dev/) on which root is allowed to login. config PASSWD bool "passwd" default y select FEATURE_SYSLOG help passwd changes passwords for user and group accounts. A normal user may only change the password for his/her own account, the super user may change the password for any account. The administrator of a group may change the password for the group. Note that Busybox binary must be setuid root for this applet to work properly. config FEATURE_PASSWD_WEAK_CHECK bool "Check new passwords for weakness" default y depends on PASSWD help With this option passwd will refuse new passwords which are "weak". config CRYPTPW bool "cryptpw" default y help Encrypts the given password with the crypt(3) libc function using the given salt. Debian has this utility under mkpasswd name. Busybox provides mkpasswd as an alias for cryptpw. config CHPASSWD bool "chpasswd" default y help Reads a file of user name and password pairs from standard input and uses this information to update a group of existing users. config FEATURE_DEFAULT_PASSWD_ALGO string "Default password encryption method (passwd -a, cryptpw -m parameter)" default "des" depends on PASSWD || CRYPTPW help Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512". config SU bool "su" default y select FEATURE_SYSLOG help su is used to become another user during a login session. Invoked without a username, su defaults to becoming the super user. Note that Busybox binary must be setuid root for this applet to work properly. config FEATURE_SU_SYSLOG bool "Enable su to write to syslog" default y depends on SU config FEATURE_SU_CHECKS_SHELLS bool "Enable su to check user's shell to be listed in /etc/shells" depends on SU default y config SULOGIN bool "sulogin" default y select FEATURE_SYSLOG help sulogin is invoked when the system goes into single user mode (this is done through an entry in inittab). config VLOCK bool "vlock" default y help Build the "vlock" applet which allows you to lock (virtual) terminals. Note that Busybox binary must be setuid root for this applet to work properly. endmenu