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✏️ Editing: login.defs
# # Please note that the parameters in this configuration file control the # behavior of the tools from the shadow-utils component. None of these # tools uses the PAM mechanism, and the utilities that use PAM (such as the # passwd command) should therefore be configured elsewhere. Refer to # /etc/pam.d/system-auth for more information. # # # Delay in seconds before being allowed another attempt after a login failure # Note: When PAM is used, some modules may enforce a minimum delay (e.g. # pam_unix(8) enforces a 2s delay) # #FAIL_DELAY 3 # Currently FAILLOG_ENAB is not supported # # Enable display of unknown usernames when login(1) failures are recorded. # #LOG_UNKFAIL_ENAB no # Currently LOG_OK_LOGINS is not supported # Currently LASTLOG_ENAB is not supported # # Limit the highest user ID number for which the lastlog entries should # be updated. # # No LASTLOG_UID_MAX means that there is no user ID limit for writing # lastlog entries. # #LASTLOG_UID_MAX # Currently MAIL_CHECK_ENAB is not supported # Currently OBSCURE_CHECKS_ENAB is not supported # Currently PORTTIME_CHECKS_ENAB is not supported # Currently QUOTAS_ENAB is not supported # Currently SYSLOG_SU_ENAB is not supported # # Enable "syslog" logging of newgrp(1) and sg(1) activity. # #SYSLOG_SG_ENAB yes # Currently CONSOLE is not supported # Currently SULOG_FILE is not supported # Currently MOTD_FILE is not supported # Currently ISSUE_FILE is not supported # Currently TTYTYPE_FILE is not supported # Currently FTMP_FILE is not supported # Currently NOLOGINS_FILE is not supported # Currently SU_NAME is not supported # *REQUIRED* # Directory where mailboxes reside, _or_ name of file, relative to the # home directory. If you _do_ define both, MAIL_DIR takes precedence. # MAIL_DIR /var/spool/mail #MAIL_FILE .mail # # If defined, file which inhibits all the usual chatter during the login # sequence. If a full pathname, then hushed mode will be enabled if the # user's name or shell are found in the file. If not a full pathname, then # hushed mode will be enabled if the file exists in the user's home directory. # #HUSHLOGIN_FILE .hushlogin #HUSHLOGIN_FILE /etc/hushlogins # Currently ENV_TZ is not supported # Currently ENV_HZ is not supported # # The default PATH settings, for superuser and normal users. # # (they are minimal, add the rest in the shell startup files) #ENV_SUPATH PATH=/sbin:/bin:/usr/sbin:/usr/bin #ENV_PATH PATH=/bin:/usr/bin # # Terminal permissions # # TTYGROUP Login tty will be assigned this group ownership. # TTYPERM Login tty will be set to this permission. # # If you have a write(1) program which is "setgid" to a special group # which owns the terminals, define TTYGROUP as the number of such group # and TTYPERM as 0620. Otherwise leave TTYGROUP commented out and # set TTYPERM to either 622 or 600. # #TTYGROUP tty #TTYPERM 0600 # Currently ERASECHAR, KILLCHAR and ULIMIT are not supported # Default initial "umask" value used by login(1) on non-PAM enabled systems. # Default "umask" value for pam_umask(8) on PAM enabled systems. # UMASK is also used by useradd(8) and newusers(8) to set the mode for new # home directories if HOME_MODE is not set. # 022 is the default value, but 027, or even 077, could be considered # for increased privacy. There is no One True Answer here: each sysadmin # must make up their mind. UMASK 022 # HOME_MODE is used by useradd(8) and newusers(8) to set the mode for new # home directories. # If HOME_MODE is not set, the value of UMASK is used to create the mode. HOME_MODE 0700 # Password aging controls: # # PASS_MAX_DAYS Maximum number of days a password may be used. # PASS_MIN_DAYS Minimum number of days allowed between password changes. # PASS_MIN_LEN Minimum acceptable password length. # PASS_WARN_AGE Number of days warning given before a password expires. # PASS_MAX_DAYS 99999 PASS_MIN_DAYS 0 PASS_WARN_AGE 7 # Currently PASS_MIN_LEN is not supported # Currently SU_WHEEL_ONLY is not supported # Currently CRACKLIB_DICTPATH is not supported # # Min/max values for automatic uid selection in useradd(8) # UID_MIN 1000 UID_MAX 60000 # System accounts SYS_UID_MIN 201 SYS_UID_MAX 999 # Extra per user uids SUB_UID_MIN 100000 SUB_UID_MAX 600100000 SUB_UID_COUNT 65536 # # Min/max values for automatic gid selection in groupadd(8) # GID_MIN 1000 GID_MAX 60000 # System accounts SYS_GID_MIN 201 SYS_GID_MAX 999 # Extra per user group ids SUB_GID_MIN 100000 SUB_GID_MAX 600100000 SUB_GID_COUNT 65536 # # Max number of login(1) retries if password is bad # #LOGIN_RETRIES 3 # # Max time in seconds for login(1) # #LOGIN_TIMEOUT 60 # Currently PASS_CHANGE_TRIES is not supported # Currently PASS_ALWAYS_WARN is not supported # Currently PASS_MAX_LEN is not supported # Currently CHFN_AUTH is not supported # # Which fields may be changed by regular users using chfn(1) - use # any combination of letters "frwh" (full name, room number, work # phone, home phone). If not defined, no changes are allowed. # For backward compatibility, "yes" = "rwh" and "no" = "frwh". # #CHFN_RESTRICT rwh # Currently LOGIN_STRING is not supported # Currently MD5_CRYPT_ENAB is not supported # # If set to MD5, MD5-based algorithm will be used for encrypting password # If set to SHA256, SHA256-based algorithm will be used for encrypting password # If set to SHA512, SHA512-based algorithm will be used for encrypting password # If set to BLOWFISH, BLOWFISH-based algorithm will be used for encrypting password # If set to DES, DES-based algorithm will be used for encrypting password (default) # ENCRYPT_METHOD SHA512 # # Only works if ENCRYPT_METHOD is set to SHA256 or SHA512. # # Define the number of SHA rounds. # With a lot of rounds, it is more difficult to brute-force the password. # However, more CPU resources will be needed to authenticate users if # this value is increased. # # If not specified, the libc will choose the default number of rounds (5000). # The values must be within the 1000-999999999 range. # SHA_CRYPT_MAX_ROUNDS 100000 # Currently SHA_CRYPT_MIN_ROUNDS is not supported # Currently BCRYPT_MIN_ROUNDS and BCRYPT_MAX_ROUNDS are not supported # Currently CONSOLE_GROUPS is not supported # # Should login be allowed if we can't cd to the home directory? # Default is yes. # #DEFAULT_HOME yes # Currently ENVIRON_FILE is not supported # # If defined, this command is run when removing a user. # It should remove any at/cron/print jobs etc. owned by # the user to be removed (passed as the first argument). # #USERDEL_CMD /usr/sbin/userdel_local # # Enables userdel(8) to remove user groups if no members exist. # USERGROUPS_ENAB yes # # If set to a non-zero number, the shadow utilities will make sure that # groups never have more than this number of users on one line. # This permits to support split groups (groups split into multiple lines, # with the same group ID, to avoid limitation of the line length in the # group file). # # 0 is the default value and disables this feature. # #MAX_MEMBERS_PER_GROUP 0 # # If useradd(8) should create home directories for users by default (non # system users only). # This option is overridden with the -M or -m flags on the useradd(8) # command-line. # CREATE_HOME yes # # Force use shadow, even if shadow passwd & shadow group files are # missing. # #FORCE_SHADOW yes # # Select the HMAC cryptography algorithm. # Used in pam_timestamp module to calculate the keyed-hash message # authentication code. # # Note: It is recommended to check hmac(3) to see the possible algorithms # that are available in your system. # HMAC_CRYPTO_ALGO SHA512
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