security.conf
—
daily security check configuration file
The security.conf
file specifies which of the standard
/etc/security services are performed. The
/etc/security script is run, by default, every night
from /etc/daily, on a NetBSD
system, if configured do to so from /etc/daily.conf.
The variables described below can be set to "NO" to
disable the test:
- check_passwd
- This checks the /etc/master.passwd file for
inconsistencies.
- check_group
- This checks the /etc/group file for
inconsistencies.
- check_rootdotfiles
- This checks the root users startup files for sane settings of $PATH and
umask. This test is not fail safe and any warning generated from this
should be checked for correctness.
- check_ftpusers
- This checks that the correct users are in the
/etc/ftpusers file.
- check_aliases
- This checks for security problems in the
/etc/mail/aliases file. For backward
compatibility, /etc/aliases will be checked as
well if exists.
- check_rhosts
- This checks for system and user rhosts files with "+" in
them.
- check_homes
- This checks that home directories are owned by the correct user, and have
appropriate permissions.
- check_varmail
- This checks that the correct user owns mail in
/var/mail, and that the mail box has the right
permissions.
- check_nfs
- This checks that the /etc/exports file does not
export filesystems to the world.
- check_devices
- This checks for changes to devices and setuid files.
- check_mtree
- This runs mtree(8) to ensure
that the system is installed correctly. The following configuration files
are checked:
- /etc/mtree/special
- Default files to check.
- /etc/mtree/special.local
- Local site additions and overrides.
- /etc/mtree/DIR.secure
- Specification for the directory DIR.
- check_disklabels
- Backup text copies of the disklabels of available disk drives into
/var/backups/work/disklabel.XXX, and display any
differences in those and the previous copies as per
check_changelist below. If
fdisk(8) is available on the
current platform, the output of /sbin/fdisk for
each available disk drive is stored in
/var/backups/work/fdisk.XXX, and any differences
displayed as per the disklabels.
- check_pkgs
- This stores a list of all installed pkgs into
/var/backups/work/pkgs and checks it for any
changes.
- check_changelist
- This determines a list of files from the contents of
/etc/changelist, and the output of
mtree -D
for
/etc/mtree/special and
/etc/mtree/special.local. For each file in the
list it compares the files with their backups in
/var/backups/file.current and
/var/backups/file.backup, and displays any
differences found. The following
mtree(8)
tags modify how files are determined from
/etc/mtree/special and
/etc/mtree/special.local:
- exclude
- The entry is ignored; no backups are made and the differences are not
displayed. This includes dynamic or binary files such as
/var/run/utmp.
- nodiff
- The entry is backed up but the differences are not displayed because
the contents of the file are sensitive. This includes files such as
/etc/master.passwd.
- check_pkg_vulnerabilities
- Checks the currently installed packages against a database of known
vulnerabilities and reports those that are vulnerable. Check the
fetch_pkg_vulnerabilities setting in
daily.conf(5) to keep
the database up to date.
- check_pkg_signatures
- Checks the digital signature of all files installed by packages against
the expected values stored in the packages database.
The variables described below can be set to modify the tests:
- check_homes_permit_usergroups
- During the check_homes phase, allow the checked files to
be group-writable if the group name is the same as the username.
- check_homes_permit_other_owner
- During the check_homes phase, allow the home directory
and files of the listed users to be owned by a different user.
- check_devices_ignore_fstypes
- Lists filesystem types to ignore during the
check_devices phase. Prefixing the type with a
‘!’ inverts the match. For example,
‘
procfs !local
’ will ignore
‘procfs
’ type filesystems and
filesystems that are not
‘local
’.
- check_devices_ignore_paths
- Lists pathnames to ignore during the check_devices
phase. Prefixing the path with a ‘!’ inverts the match. For
example, ‘
/tftp
’ will ignore paths
under /tftp while
‘!/home
’ will ignore paths that are
not under /home.
- check_mtree_follow_symlinks
- During the check_mtree phase, instruct mtree to follow
symbolic links. Please note, this may cause the
check_mtree phase to report errors for entries for these
symbolic links (i.e. of type=link in the mtree specification) as they will
always appear to be plain files for the purposes of the check.
/etc/mtree/special.local may be used to override
the checks for the affected links.
- check_passwd_nowarn_shells
- If check_passwd is enabled, most warnings will be
suppressed for entries whose shells are listed in this space-separated
list. This is of particular value when those shells are not in
/etc/shells.
- check_passwd_nowarn_users
- If check_passwd is enabled, suppress warnings for these
users.
- check_passwd_permit_dups
- If check_passwd is enabled, do not warn about duplicate
uids for the listed login names.
- check_passwd_permit_nonalpha
- If check_passwd is enabled, do not warn about login
names which use non-alphanumeric characters.
- check_passwd_permit_star
- If check_passwd is enabled, do not warn about password
fields set to “*”. Note that the use of password fields such
as “*ssh” is encouraged, instead.
- max_grouplen
- If check_group is enabled, this determines the maximum
permitted length of group names.
- max_loginlen
- If check_passwd is enabled, this determines the maximum
permitted length of login names.
- backup_dir
- Change the backup directory from /var/backup.
- diff_options
- Specify the options passed to
diff(1) when it is invoked to
show changes made to system files. Defaults to “-u”, for
unified-format context-diffs.
- pkgdb_dir
- DEPRECATED. Please set
PKGDB_DIR
in
pkg_install.conf(5)
instead.
If defined, points to the location of the packages database.
Defaults to /var/db/pkg.
- backup_uses_rcs
- Use rcs(1) for maintaining
backup copies of files noted in check_devices,
check_disklabels, check_pkgs, and
check_changelist instead of just keeping a current copy
and a backup copy.
- /etc/defaults/security.conf
- defaults for /etc/security.conf
- /etc/security
- daily security check script
- /etc/security.conf
- daily security check configuration
- /etc/security.local
- local site additions to /etc/security
The security.conf
file appeared in
NetBSD 1.3. The check_disklabels
functionality was added in NetBSD 1.4. The
backup_uses_rcs and check_pkgs features
were added in NetBSD 1.6.
diff_options appeared in NetBSD 2.0;
prior to that, traditional-format (context free) diffs were generated.