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https://github.com/ovh/debian-cis.git
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de295b3a77
* 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
94 lines
3.0 KiB
Bash
Executable File
94 lines
3.0 KiB
Bash
Executable File
#!/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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