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Adapt all scripts to yescrypt (#216)

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* Revert "fix: clean obsolete check 99.5.4.5.1, now handled by 5.3.4 (#215)"

This reverts commit 670c8c62f5.

We still want to verify the preexisting hashes in /etc/shadow,
even if the PAM configuration is correct for new passwords (5.3.4).

* Adapt 5.3.4, 99.5.4.5.1 and 99.5.4.5.2 to yescrypt
This commit is contained in:
Stéphane Lesimple 2023-11-21 17:43:31 +01:00 committed by GitHub
parent 693487c3a5
commit de295b3a77
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 182 additions and 17 deletions
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21
bin/hardening/5.3.4_acc_pam_sha512.sh
View File

@ -15,20 +15,18 @@ set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=2
# shellcheck disable=2034
DESCRIPTION="Check that any password that may exist in /etc/shadow is yescrypt (or SHA512 for debian 10) hashed and salted"
DESCRIPTION="Check that the algorithm declared in PAM for password changes is sha512 (or yescrypt for Debian 11+)"
CONF_FILE="/etc/pam.d/common-password"
CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*sha512"
# CONF_LINE is defined in _set_vars_jit below
# This function will be called if the script status is on enabled / audit mode
audit() {
_set_vars_jit
# Check conf file for default SHA512 hash
if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
crit "$CONF_FILE is not readable"
else
if [ "$DEB_MAJ_VER" -ge "11" ]; then
CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*yescrypt" # https://github.com/ovh/debian-cis/issues/158
fi
# shellcheck disable=SC2001
does_pattern_exist_in_file "$CONF_FILE" "$(sed 's/ /[[:space:]]+/g' <<<"$CONF_LINE")"
if [ "$FNRET" = 0 ]; then
@ -41,6 +39,7 @@ audit() {
# This function will be called if the script status is on enabled mode
apply() {
_set_vars_jit
if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
crit "$CONF_FILE is not readable"
else
@ -64,6 +63,18 @@ check_config() {
:
}
# As we use DEB_MAJ_VER, which is set by constants.sh, itself sourced by main.sh below,
# We need to call this in the subs called by main.sh when it is sourced, otherwise it would
# either be too soon (DEB_MAJ_VER not defined) or too late (test has already been run)
_set_vars_jit() {
if [ "$DEB_MAJ_VER" -ge "11" ]; then
CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*(sha512|yescrypt)" # https://github.com/ovh/debian-cis/issues/158
else
CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*sha512"
fi
unset -f _set_vars_jit
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

32
bin/hardening/99.5.4.5.1_acc_logindefs_sha512.sh
View File

@ -6,7 +6,7 @@
#
#
# 99.5.4.5.1 Check that any password that will be created will be SHA512 hashed and salted
# 99.5.4.5.1 Check that any password that will be created will use sha512crypt (or yescrypt for Debian 11+)
#
set -e # One error, it's over
@ -15,31 +15,33 @@ set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=2
# shellcheck disable=2034
DESCRIPTION="Check that any password that will be created will be SHA512 hashed and salted"
DESCRIPTION="Check that any password that will be created will use sha512crypt (or yescrypt for Debian 11+)"
CONF_FILE="/etc/login.defs"
CONF_LINE="ENCRYPT_METHOD SHA512"
# CONF_LINE and CONF_LINE_REGEX are defined in _set_vars_jit below
# This function will be called if the script status is on enabled / audit mode
audit() {
_set_vars_jit
# Check conf file for default SHA512 hash
if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
crit "$CONF_FILE is not readable"
else
does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE/ /[[:space:]]+}"
does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE_REGEX/ /[[:space:]]+}"
if [ "$FNRET" = 0 ]; then
ok "$CONF_LINE is present in $CONF_FILE"
ok "$CONF_LINE_REGEX is present in $CONF_FILE"
else
crit "$CONF_LINE is not present in $CONF_FILE"
crit "$CONF_LINE_REGEX is not present in $CONF_FILE"
fi
fi
}
# This function will be called if the script status is on enabled mode
apply() {
does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE/ /[[:space:]]+}"
_set_vars_jit
does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE_REGEX/ /[[:space:]]+}"
if [ "$FNRET" = 0 ]; then
ok "$CONF_LINE is present in $CONF_FILE"
ok "$CONF_LINE_REGEX is present in $CONF_FILE"
else
warn "$CONF_LINE is not present in $CONF_FILE, adding it"
does_pattern_exist_in_file "$CONF_FILE" "^$(echo "$CONF_LINE" | cut -d ' ' -f1)"
@ -57,6 +59,20 @@ check_config() {
:
}
# As we use DEB_MAJ_VER, which is set by constants.sh, itself sourced by main.sh below,
# We need to call this in the subs called by main.sh when it is sourced, otherwise it would
# either be too soon (DEB_MAJ_VER not defined) or too late (test has already been run)
_set_vars_jit() {
if [ "$DEB_MAJ_VER" -ge "11" ]; then
CONF_LINE_REGEX="ENCRYPT_METHOD (SHA512|yescrypt|YESCRYPT)"
CONF_LINE="ENCRYPT_METHOD YESCRYPT"
else
CONF_LINE_REGEX="ENCRYPT_METHOD SHA512"
CONF_LINE="ENCRYPT_METHOD SHA512"
fi
unset -f _set_vars_jit
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

93
bin/hardening/99.5.4.5.2_acc_shadow_sha512.sh Executable file
View File

@ -0,0 +1,93 @@
#!/bin/bash
# run-shellcheck
#
# OVH Security audit
#
#
# 99.5.4.5.2 Check that passwords in /etc/shadow are sha512crypt (or yescrypt for Debian 11+) hashed and salted
#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=2
# shellcheck disable=2034
DESCRIPTION="Check that passwords in /etc/shadow are sha512crypt (or yescrypt for Debian 11+) hashed and salted"
FILE="/etc/shadow"
# This function will be called if the script status is on enabled / audit mode
audit() {
# Review shadow file for existing passwords
pw_found=""
users_reviewed=""
if $SUDO_CMD [ ! -r "$FILE" ]; then
crit "$FILE is not readable"
return
fi
for line in $($SUDO_CMD cut -d ":" -f 1,2 /etc/shadow); do
users_reviewed+="$line "
user=$(echo "$line" | cut -d ":" -f 1)
passwd=$(echo "$line" | cut -d ":" -f 2)
if [[ $passwd = '!' || $passwd = '*' ]]; then
continue
elif [[ $passwd =~ ^!.*$ ]]; then
pw_found+="$user "
ok "User $user has a disabled password."
# yescrypt: Check password against $y$<salt>$<base64>
elif [ "$DEB_MAJ_VER" -ge "11" ] && [[ $passwd =~ ^\$y\$[./A-Za-z0-9]+\$[./A-Za-z0-9]{,86}\$[./A-Za-z0-9]{43} ]]; then
pw_found+="$user "
ok "User $user has suitable yescrypt hashed password."
# sha512: Check password against $6$<salt>$<base64>, see `man 3 crypt`
elif [[ $passwd =~ ^\$6(\$rounds=[0-9]+)?\$[a-zA-Z0-9./]{2,16}\$[a-zA-Z0-9./]{86}$ ]]; then
pw_found+="$user "
ok "User $user has suitable sha512crypt hashed password."
else
pw_found+="$user "
if [ "$DEB_MAJ_VER" -ge "11" ]; then
crit "User $user has a password that is not sha512crypt nor yescrypt hashed."
else
crit "User $user has a password that is not sha512crypt hashed."
fi
fi
done
if [[ -z "$users_reviewed" ]]; then
crit "No users were reviewed in $FILE !"
return
fi
if [[ -z "$pw_found" ]]; then
ok "There is no password in $FILE"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
:
}
# This function will check config parameters required
check_config() {
:
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default
. /etc/default/cis-hardening
fi
if [ -z "$CIS_LIB_DIR" ]; then
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
echo "Cannot source CIS_LIB_DIR variable, aborting."
exit 128
fi
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
# shellcheck source=../../lib/main.sh
. "${CIS_LIB_DIR}"/main.sh
else
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
exit 128
fi

2
tests/hardening/5.3.4_acc_pam_sha512.sh
View File

@ -3,7 +3,7 @@
test_audit() {
describe Running on blank host
register_test retvalshouldbe 0
register_test contain REGEX "[ OK ] .*(sha512|yescrypt) is present in /etc/pam.d/common-password"
register_test contain "is present in /etc/pam.d/common-password"
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
}

6
tests/hardening/99.5.4.5.1_acc_logindefs_sha512.sh
View File

@ -3,7 +3,7 @@
test_audit() {
describe Running on blank host
register_test retvalshouldbe 0
register_test contain "ENCRYPT_METHOD SHA512 is present in /etc/login.defs"
register_test contain "is present in /etc/login.defs"
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
@ -11,7 +11,7 @@ test_audit() {
describe Line as comment
sed -i 's/\(ENCRYPT_METHOD SHA512\)/# \1/' /etc/login.defs
register_test retvalshouldbe 1
register_test contain "SHA512 is not present"
register_test contain "is not present in /etc/login.defs"
run commented "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
rm /etc/login.defs
@ -24,7 +24,7 @@ test_audit() {
sed -ir 's/ENCRYPT_METHOD[[:space:]]\+SHA512/ENCRYPT_METHOD MD5/' /etc/login.defs
describe Fail: wrong hash function configuration
register_test retvalshouldbe 1
register_test contain "SHA512 is not present"
register_test contain "is not present in /etc/login.defs"
run wrongconf "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
describe Correcting situation

40
tests/hardening/99.5.4.5.2_acc_shadow_sha512.sh Normal file
View File

@ -0,0 +1,40 @@
# shellcheck shell=bash
# run-shellcheck
test_audit() {
describe Running on blank host
register_test retvalshouldbe 0
register_test contain "There is no password in /etc/shadow"
dismiss_count_for_test
# shellcheck disable=2154
run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
cp -a /etc/shadow /tmp/shadow.bak
sed -i 's/secaudit:!/secaudit:mypassword/' /etc/shadow
describe Fail: Found unsecure password
register_test retvalshouldbe 1
register_test contain "User secaudit has a password that is not"
run unsecpasswd "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
sed -i 's/secaudit:mypassword/secaudit:!!/' /etc/shadow
describe Fail: Found disabled password
register_test retvalshouldbe 0
register_test contain "User secaudit has a disabled password"
run lockedpasswd "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
mv /tmp/shadow.bak /etc/shadow
chpasswd -c SHA512 <<EOF
secaudit:mypassword
EOF
describe Pass: Found properly hashed password
register_test retvalshouldbe 0
register_test contain "User secaudit has suitable"
run sha512pass "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
chpasswd -c SHA512 -s 1000 <<EOF
secaudit:mypassword
EOF
describe Pass: Found properly hashed password with custom round number
register_test retvalshouldbe 0
register_test contain "User secaudit has suitable"
run sha512pass "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
}

5
tests/launch_tests.sh
View File

@ -140,6 +140,11 @@ _run() {
echo $? >"$outdir/$usecase_name.retval"
ret=$(<"$outdir"/"$usecase_name".retval)
get_stdout
if [ -s "$outdir/${usecase_name}_err.log" ]; then
echo ">>> stderr follows"
cat "$outdir/${usecase_name}_err.log"
echo "<<< end of stderr"
fi
}
# Load assertion functions for functionnal tests