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feat: Filter the filesystem to check when the list is built. (#156)

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* feat: Attempt to filter-out filesystem that match exclusion regex.
This commit is contained in:
ymartin-ovh 2022-06-24 17:45:47 +02:00 committed by GitHub
parent 7a3145d7f1
commit 66ccc6316a
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 49 additions and 18 deletions
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8
bin/hardening/1.1.21_sticky_bit_world_writable_folder.sh
View File

@ -22,11 +22,15 @@ EXCEPTIONS=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if setuid is set on world writable Directories"
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
if [ -n "$EXCEPTIONS" ]; then
# maybe EXCEPTIONS allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCEPTIONS")
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -regextype 'egrep' ! -regex $EXCEPTIONS -print 2>/dev/null)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
fi
@ -45,7 +49,7 @@ audit() {
apply() {
if [ -n "$EXCEPTIONS" ]; then
# shellcheck disable=SC2086
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -regextype 'egrep' ! -regex $EXCEPTIONS -print 2>/dev/null)
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCEPTIONS" | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -regextype 'egrep' ! -regex "$EXCEPTIONS" -print 2>/dev/null)
else
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type d \( -perm -0002 -a ! -perm -1000 \) -print 2>/dev/null)
fi

9
bin/hardening/6.1.10_find_world_writable_file.sh
View File

@ -22,12 +22,15 @@ EXCLUDED=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if there are world writable files"
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
if [ -n "$EXCLUDED" ]; then
# maybe EXCLUDED allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED")
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -0002 -regextype 'egrep' ! -regex $EXCLUDED -print 2>/dev/null)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -0002 -print 2>/dev/null)
fi
@ -46,7 +49,7 @@ audit() {
apply() {
if [ -n "$EXCLUDED" ]; then
# shellcheck disable=SC2086
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type f -perm -0002 -regextype 'egrep' ! -regex $EXCLUDED -print 2>/dev/null)
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED" | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type f -perm -0002 -regextype 'egrep' ! -regex "$EXCLUDED" -print 2>/dev/null)
else
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -type f -perm -0002 -print 2>/dev/null)
fi

9
bin/hardening/6.1.11_find_unowned_files.sh
View File

@ -23,14 +23,19 @@ EXCLUDED=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if there are unowned files"
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
if [ -n "$EXCLUDED" ]; then
# maybe EXCLUDED allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED")
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -nouser -regextype 'egrep' ! -regex $EXCLUDED -print 2>/dev/null)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -nouser -print 2>/dev/null)
fi
if [ -n "$RESULT" ]; then
crit "Some unowned files are present"
# shellcheck disable=SC2001
@ -45,7 +50,7 @@ audit() {
apply() {
if [ -n "$EXCLUDED" ]; then
# shellcheck disable=SC2086
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nouser -regextype 'egrep' ! -regex $EXCLUDED -ls 2>/dev/null)
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED" | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nouser -regextype 'egrep' ! -regex "$EXCLUDED" -ls 2>/dev/null)
else
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nouser -ls 2>/dev/null)
fi

9
bin/hardening/6.1.12_find_ungrouped_files.sh
View File

@ -23,14 +23,19 @@ EXCLUDED=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if there are ungrouped files"
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
if [ -n "$EXCLUDED" ]; then
# maybe EXCLUDED allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED")
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -nogroup -regextype 'egrep' ! -regex $EXCLUDED -print 2>/dev/null)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=SC2086
RESULT=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -nogroup -print 2>/dev/null)
fi
if [ -n "$RESULT" ]; then
crit "Some ungrouped files are present"
# shellcheck disable=SC2001
@ -45,7 +50,7 @@ audit() {
apply() {
if [ -n "$EXCLUDED" ]; then
# shellcheck disable=SC2086
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nogroup -regextype 'egrep' ! -regex $EXCLUDED -ls 2>/dev/null)
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$EXCLUDED" | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nogroup -regextype 'egrep' ! -regex "$EXCLUDED" -ls 2>/dev/null)
else
RESULT=$(df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -ignore_readdir_race -nogroup -ls 2>/dev/null)
fi

10
bin/hardening/6.1.13_find_suid_files.sh
View File

@ -21,13 +21,19 @@ IGNORED_PATH=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if there are suid files"
FS_NAMES=$(df --local -P | awk '{ if (NR!=1) print $6 }')
# shellcheck disable=2086
if [ -n "$IGNORED_PATH" ]; then
# maybe IGNORED_PATH allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$IGNORED_PATH")
# shellcheck disable=2086
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -regextype 'egrep' ! -regex $IGNORED_PATH -print)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=2086
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -print)
fi
BAD_BINARIES=""
for BINARY in $FOUND_BINARIES; do
if grep -qw "$BINARY" <<<"$EXCEPTIONS"; then

10
bin/hardening/6.1.14_find_sgid_files.sh
View File

@ -21,13 +21,19 @@ IGNORED_PATH=''
# This function will be called if the script status is on enabled / audit mode
audit() {
info "Checking if there are sgid files"
FS_NAMES=$(df --local -P | awk '{ if (NR!=1) print $6 }')
# shellcheck disable=2086
if [ -n "$IGNORED_PATH" ]; then
# maybe IGNORED_PATH allow us to filter out some FS
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$IGNORED_PATH")
# shellcheck disable=2086
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -2000 -regextype 'egrep' ! -regex $IGNORED_PATH -print)
else
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
# shellcheck disable=2086
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -2000 -print)
fi
BAD_BINARIES=""
for BINARY in $FOUND_BINARIES; do
if grep -qw "$BINARY" <<<"$EXCEPTIONS"; then

4
bin/hardening/99.5.2.4_ssh_keys_from.sh
View File

@ -109,7 +109,7 @@ audit() {
crit "/etc/ssh/sshd_config is not readable."
else
ret=$($SUDO_CMD grep -iP "^AuthorizedKeysFile" /etc/ssh/sshd_config || echo '#KO')
if [ "x$ret" = "x#KO" ]; then
if [ "$ret" = "#KO" ]; then
debug "No AuthorizedKeysFile defined in sshd_config."
else
AUTHKEYFILE_PATTERN=$(echo "$ret" | sed 's/AuthorizedKeysFile//i' | sed 's#%h/##' | tr -s "[:space:]")
@ -137,7 +137,7 @@ audit() {
continue
else
info "User $user has a valid shell ($shell)."
if [ "x$user" = "xroot" ] && [ "$user" != "$EXCEPTION_USER" ]; then
if [ "$user" = "root" ] && [ "$user" != "$EXCEPTION_USER" ]; then
check_dir /root
continue
elif $SUDO_CMD [ ! -d /home/"$user" ]; then

4
lib/utils.sh
View File

@ -349,10 +349,10 @@ is_kernel_option_enabled() {
fi
ANSWER=$(cut -d = -f 2 <<<"$RESULT")
if [ "x$ANSWER" = "xy" ]; then
if [ "$ANSWER" = "y" ]; then
debug "Kernel option $KERNEL_OPTION enabled"
FNRET=0
elif [ "x$ANSWER" = "xn" ]; then
elif [ "$ANSWER" = "n" ]; then
debug "Kernel option $KERNEL_OPTION disabled"
FNRET=1
else

4
tests/hardening/6.1.10_find_world_writable_file.sh
View File

@ -5,7 +5,9 @@ test_audit() {
# shellcheck disable=2154
/opt/debian-cis/bin/hardening/"${script}".sh || true
# shellcheck disable=2016
echo 'EXCLUDED="$EXCLUDED ^/dev/.*"' >>/opt/debian-cis/etc/conf.d/"${script}".cfg
echo 'EXCLUDED="$EXCLUDED ^/home/secaudit/thisfileisignored.*|^/dev/.*"' >>/opt/debian-cis/etc/conf.d/"${script}".cfg
touch /home/secaudit/thisfileisignored
chmod 777 /home/secaudit/thisfileisignored
describe Running on blank host
register_test retvalshouldbe 0