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https://github.com/ovh/debian-cis.git
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Adapt all scripts to yescrypt (#216)
* 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
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693487c3a5
commit
de295b3a77
@ -15,20 +15,18 @@ 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="Check that any password that may exist in /etc/shadow is yescrypt (or SHA512 for debian 10) hashed and salted"
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DESCRIPTION="Check that the algorithm declared in PAM for password changes is sha512 (or yescrypt for Debian 11+)"
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CONF_FILE="/etc/pam.d/common-password"
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CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*sha512"
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# CONF_LINE is defined in _set_vars_jit below
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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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_set_vars_jit
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# Check conf file for default SHA512 hash
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if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
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crit "$CONF_FILE is not readable"
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else
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if [ "$DEB_MAJ_VER" -ge "11" ]; then
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CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*yescrypt" # https://github.com/ovh/debian-cis/issues/158
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fi
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# shellcheck disable=SC2001
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does_pattern_exist_in_file "$CONF_FILE" "$(sed 's/ /[[:space:]]+/g' <<<"$CONF_LINE")"
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if [ "$FNRET" = 0 ]; then
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@ -41,6 +39,7 @@ audit() {
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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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_set_vars_jit
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if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
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crit "$CONF_FILE is not readable"
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else
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@ -64,6 +63,18 @@ check_config() {
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:
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}
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# As we use DEB_MAJ_VER, which is set by constants.sh, itself sourced by main.sh below,
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# We need to call this in the subs called by main.sh when it is sourced, otherwise it would
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# either be too soon (DEB_MAJ_VER not defined) or too late (test has already been run)
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_set_vars_jit() {
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if [ "$DEB_MAJ_VER" -ge "11" ]; then
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CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*(sha512|yescrypt)" # https://github.com/ovh/debian-cis/issues/158
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else
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CONF_LINE="^\s*password\s.+\s+pam_unix\.so\s+.*sha512"
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fi
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unset -f _set_vars_jit
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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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@ -6,7 +6,7 @@
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#
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#
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# 99.5.4.5.1 Check that any password that will be created will be SHA512 hashed and salted
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# 99.5.4.5.1 Check that any password that will be created will use sha512crypt (or yescrypt for Debian 11+)
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#
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set -e # One error, it's over
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@ -15,31 +15,33 @@ 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="Check that any password that will be created will be SHA512 hashed and salted"
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DESCRIPTION="Check that any password that will be created will use sha512crypt (or yescrypt for Debian 11+)"
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CONF_FILE="/etc/login.defs"
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CONF_LINE="ENCRYPT_METHOD SHA512"
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# CONF_LINE and CONF_LINE_REGEX are defined in _set_vars_jit below
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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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_set_vars_jit
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# Check conf file for default SHA512 hash
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if $SUDO_CMD [ ! -r "$CONF_FILE" ]; then
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crit "$CONF_FILE is not readable"
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else
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does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE/ /[[:space:]]+}"
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does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE_REGEX/ /[[:space:]]+}"
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if [ "$FNRET" = 0 ]; then
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ok "$CONF_LINE is present in $CONF_FILE"
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ok "$CONF_LINE_REGEX is present in $CONF_FILE"
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else
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crit "$CONF_LINE is not present in $CONF_FILE"
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crit "$CONF_LINE_REGEX is not present in $CONF_FILE"
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fi
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE/ /[[:space:]]+}"
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_set_vars_jit
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does_pattern_exist_in_file "$CONF_FILE" "^ *${CONF_LINE_REGEX/ /[[:space:]]+}"
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if [ "$FNRET" = 0 ]; then
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ok "$CONF_LINE is present in $CONF_FILE"
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ok "$CONF_LINE_REGEX is present in $CONF_FILE"
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else
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warn "$CONF_LINE is not present in $CONF_FILE, adding it"
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does_pattern_exist_in_file "$CONF_FILE" "^$(echo "$CONF_LINE" | cut -d ' ' -f1)"
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@ -57,6 +59,20 @@ check_config() {
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:
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}
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# As we use DEB_MAJ_VER, which is set by constants.sh, itself sourced by main.sh below,
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# We need to call this in the subs called by main.sh when it is sourced, otherwise it would
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# either be too soon (DEB_MAJ_VER not defined) or too late (test has already been run)
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_set_vars_jit() {
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if [ "$DEB_MAJ_VER" -ge "11" ]; then
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CONF_LINE_REGEX="ENCRYPT_METHOD (SHA512|yescrypt|YESCRYPT)"
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CONF_LINE="ENCRYPT_METHOD YESCRYPT"
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else
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CONF_LINE_REGEX="ENCRYPT_METHOD SHA512"
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CONF_LINE="ENCRYPT_METHOD SHA512"
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fi
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unset -f _set_vars_jit
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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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93
bin/hardening/99.5.4.5.2_acc_shadow_sha512.sh
Executable file
93
bin/hardening/99.5.4.5.2_acc_shadow_sha512.sh
Executable file
@ -0,0 +1,93 @@
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#!/bin/bash
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# run-shellcheck
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#
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# OVH Security audit
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#
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#
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# 99.5.4.5.2 Check that passwords in /etc/shadow are sha512crypt (or yescrypt for Debian 11+) hashed and salted
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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="Check that passwords in /etc/shadow are sha512crypt (or yescrypt for Debian 11+) hashed and salted"
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FILE="/etc/shadow"
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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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# Review shadow file for existing passwords
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pw_found=""
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users_reviewed=""
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if $SUDO_CMD [ ! -r "$FILE" ]; then
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crit "$FILE is not readable"
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return
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fi
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for line in $($SUDO_CMD cut -d ":" -f 1,2 /etc/shadow); do
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users_reviewed+="$line "
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user=$(echo "$line" | cut -d ":" -f 1)
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passwd=$(echo "$line" | cut -d ":" -f 2)
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if [[ $passwd = '!' || $passwd = '*' ]]; then
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continue
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elif [[ $passwd =~ ^!.*$ ]]; then
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pw_found+="$user "
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ok "User $user has a disabled password."
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# yescrypt: Check password against $y$<salt>$<base64>
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elif [ "$DEB_MAJ_VER" -ge "11" ] && [[ $passwd =~ ^\$y\$[./A-Za-z0-9]+\$[./A-Za-z0-9]{,86}\$[./A-Za-z0-9]{43} ]]; then
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pw_found+="$user "
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ok "User $user has suitable yescrypt hashed password."
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# sha512: Check password against $6$<salt>$<base64>, see `man 3 crypt`
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elif [[ $passwd =~ ^\$6(\$rounds=[0-9]+)?\$[a-zA-Z0-9./]{2,16}\$[a-zA-Z0-9./]{86}$ ]]; then
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pw_found+="$user "
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ok "User $user has suitable sha512crypt hashed password."
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else
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pw_found+="$user "
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if [ "$DEB_MAJ_VER" -ge "11" ]; then
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crit "User $user has a password that is not sha512crypt nor yescrypt hashed."
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else
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crit "User $user has a password that is not sha512crypt hashed."
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fi
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fi
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done
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if [[ -z "$users_reviewed" ]]; then
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crit "No users were reviewed in $FILE !"
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return
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fi
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if [[ -z "$pw_found" ]]; then
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ok "There is no password in $FILE"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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:
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$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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