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adding new scripts for debian12
- "users_homedir_is_configured.sh" is a concatenation of different existing scripts:
- [users_homedir_exist.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/users_homedir_exist.sh)
- [users_homedir_ownership.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/users_homedir_ownership.sh)
- [check_user_dir_perm.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/check_user_dir_perm.sh)
And so is its test
It will be mapped as 7.2.9 for debian 12
- The following scripts are a split from [5.3.1_enable_pwquality.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/enable_pwquality.sh):
- enable_libpam_pwquality.sh -> will be mapped as 5.3.2.3
- install_libpam_pwquality.sh -> will be mapped as 5.3.1.3
- password_complexity.sh -> will be mapped as 5.3.3.2.3
- password_min_length.sh -> will be mapped as 5.3.3.2.2
The others are scripts are new.
They will be mapped as follow for debian 12 CIS :
- apt_gpg_is_configured.sh -> 1.2.1.1
- dev_shm_separate_partition.sh -> 1.2.2.1
- install_iptables.sh -> 4.3.1.1
- install_nftables.sh -> 4.2.1
- password_consecutive_characters.sh -> 5.3.3.2.4
- password_max_sequential_characters.sh -> 5.3.3.2.5
This commit is contained in:
Damien Cavagnini
161
bin/hardening/users_homedir_is_configured.sh
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161
bin/hardening/users_homedir_is_configured.sh
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#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# Ensure local interactive user home directories are configured (Automated)
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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DESCRIPTION="Users are assigned valid home directories"
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# a home is purposefully owned by another user
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# format: <dir>:<user_name>:<owner_name>
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# ex: HOME_OWNER_EXCEPTIONS="/usr/sbin:daemon:root"
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HOME_OWNER_EXCEPTIONS=""
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# space separated list of path, where permissions are different than 0750
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HOME_PERM_EXCEPTIONS=""
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ERRORS=0
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check_home_owner() {
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# user owns home
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local user=$1
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local home=$2
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FNRET=0
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owner=$(stat -L -c "%U" "$home")
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if [ "$owner" != "$user" ]; then
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EXCEP_FOUND=0
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for excep in $HOME_OWNER_EXCEPTIONS; do
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if [ "$home:$user:$owner" = "$excep" ]; then
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ok "The home directory ($home) of user $user is owned by $owner but is part of exceptions ($home:$user:$owner)."
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EXCEP_FOUND=1
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break
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fi
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done
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if [ "$EXCEP_FOUND" -eq 0 ]; then
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crit "The home directory ($home) of user $user is owned by $owner."
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FNRET=1
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fi
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fi
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}
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check_home_perm() {
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# 750 or more restrictive
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local home=$1
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HOME_PERM_ERRORS=0
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debug "Exceptions : $HOME_PERM_EXCEPTIONS"
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debug "echo \"$HOME_PERM_EXCEPTIONS\" | grep -q $home"
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if echo "$HOME_PERM_EXCEPTIONS" | grep -q "$home"; then
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debug "$home is confirmed as an exception"
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# shellcheck disable=SC2001
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RESULT=$(sed "s!$home!!" <<<"$RESULT")
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else
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debug "$home not found in exceptions"
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fi
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if [ -d "$home" ]; then
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dirperm=$(/bin/ls -ld "$home" | cut -f1 -d" ")
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if [ "$(echo "$dirperm" | cut -c6)" != "-" ]; then
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crit "Group Write permission set on directory $home"
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HOME_PERM_ERRORS=$((HOME_PERM_ERRORS + 1))
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fi
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if [ "$(echo "$dirperm" | cut -c8)" != "-" ]; then
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crit "Other Read permission set on directory $home"
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HOME_PERM_ERRORS=$((HOME_PERM_ERRORS + 1))
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fi
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if [ "$(echo "$dirperm" | cut -c9)" != "-" ]; then
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crit "Other Write permission set on directory $home"
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HOME_PERM_ERRORS=$((HOME_PERM_ERRORS + 1))
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fi
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if [ "$(echo "$dirperm" | cut -c10)" != "-" ]; then
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crit "Other Execute permission set on directory $home"
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HOME_PERM_ERRORS=$((HOME_PERM_ERRORS + 1))
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fi
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fi
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}
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# This function will be called if the script status is on enabled / audit mode
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audit() {
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RESULT=$(get_db passwd | awk -F: '{ print $1 ":" $3 ":" $6 }')
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for LINE in $RESULT; do
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debug "Working on $LINE"
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USER=$(awk -F: '{print $1}' <<<"$LINE")
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USERID=$(awk -F: '{print $2}' <<<"$LINE")
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DIR=$(awk -F: '{print $3}' <<<"$LINE")
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if [ "$USERID" -ge 1000 ]; then
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if [ ! -d "$DIR" ] && [ "$USER" != "nfsnobody" ] && [ "$USER" != "nobody" ] && [ "$DIR" != "/nonexistent" ]; then
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crit "The home directory ($DIR) of user $USER does not exist."
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ERRORS=$((ERRORS + 1))
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fi
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if [ -d "$DIR" ] && [ "$USER" != "nfsnobody" ]; then
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check_home_owner "$USER" "$DIR"
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[ $FNRET -ne 0 ] && ERRORS=$((ERRORS + 1))
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fi
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fi
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done
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for DIR in $(get_db passwd | grep -Ev '(root|halt|sync|shutdown)' | awk -F: '($7 != "/usr/sbin/nologin" && $7 != "/sbin/nologin" && $7 != "/bin/false" && $7 !="/nonexistent" ) { print $6 }'); do
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check_home_perm "$DIR"
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ERRORS=$((ERRORS + HOME_PERM_ERRORS))
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done
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if [ "$ERRORS" -eq 0 ]; then
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ok "All home directories are correctly configured"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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info "Modifying home directories may seriously harm your system, report only here"
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}
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create_config() {
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cat <<EOF
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status=audit
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# Put here user home directories exceptions
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# format: <dir>:<user_name>:<owner_name>
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HOME_OWNER_EXCEPTIONS=""
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# space separated list of path, where permissions are different than 0750
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HOME_PERM_EXCEPTIONS=""
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EOF
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}
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# This function will check config parameters required
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check_config() {
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if [ -z "$HOME_PERM_EXCEPTIONS" ]; then
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HOME_PERM_EXCEPTIONS="@"
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fi
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_LIB_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_LIB_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. "${CIS_LIB_DIR}"/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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