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ADD(5.2.20-23): add new sshd checks

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This commit is contained in:
Thibault Ayanides 2020-12-23 11:41:53 +01:00
parent 520ab63b29
commit d0ab72dd26
8 changed files with 279 additions and 12 deletions
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59
bin/hardening/5.2.20_enable_ssh_pam.sh
View File

@ -17,14 +17,59 @@ HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Enable SSH PAM."
PACKAGE='openssh-server'
OPTIONS=''
FILE='/etc/ssh/sshd_config'
# This function will be called if the script status is on enabled / audit mode
audit() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" != 0 ]; then
crit "$PACKAGE is not installed!"
else
ok "$PACKAGE is installed"
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file $FILE "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
crit "$PATTERN is not present in $FILE"
fi
done
fi
}
# This function will be called if the script status is on enabled mode
apply() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE is installed"
else
crit "$PACKAGE is absent, installing it"
apt_install "$PACKAGE"
fi
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file "$FILE" "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
warn "$PATTERN is not present in $FILE, adding it"
does_pattern_exist_in_file "$FILE" "^${SSH_PARAM}"
if [ "$FNRET" != 0 ]; then
add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
else
info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
fi
/etc/init.d/ssh reload
fi
done
}
# This function will check config parameters required
@ -32,6 +77,16 @@ check_config() {
:
}
# This function will check config parameters required
create_config() {
cat <<EOF
status=audit
# Value of usepam
# Settles sshd usepam
OPTIONS='usepam=yes'
EOF
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

59
bin/hardening/5.2.21_disable_ssh_allow_tcp_forwarding.sh
View File

@ -17,14 +17,59 @@ HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Disable SSH AllowTCPForwarding."
PACKAGE='openssh-server'
OPTIONS=''
FILE='/etc/ssh/sshd_config'
# This function will be called if the script status is on enabled / audit mode
audit() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" != 0 ]; then
crit "$PACKAGE is not installed!"
else
ok "$PACKAGE is installed"
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file $FILE "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
crit "$PATTERN is not present in $FILE"
fi
done
fi
}
# This function will be called if the script status is on enabled mode
apply() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE is installed"
else
crit "$PACKAGE is absent, installing it"
apt_install "$PACKAGE"
fi
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file "$FILE" "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
warn "$PATTERN is not present in $FILE, adding it"
does_pattern_exist_in_file "$FILE" "^${SSH_PARAM}"
if [ "$FNRET" != 0 ]; then
add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
else
info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
fi
/etc/init.d/ssh reload
fi
done
}
# This function will check config parameters required
@ -32,6 +77,16 @@ check_config() {
:
}
# This function will check config parameters required
create_config() {
cat <<EOF
status=audit
# Value of AllowTCPForwarding
# Settles sshd allowtcpforwarding
OPTIONS='AllowTCPForwarding=no'
EOF
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

62
bin/hardening/5.2.22_configure_ssh_max_startups.sh
View File

@ -17,14 +17,59 @@ HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Configure SSHMaxStartups."
PACKAGE='openssh-server'
OPTIONS=''
FILE='/etc/ssh/sshd_config'
# This function will be called if the script status is on enabled / audit mode
audit() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" != 0 ]; then
crit "$PACKAGE is not installed!"
else
ok "$PACKAGE is installed"
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file $FILE "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
crit "$PATTERN is not present in $FILE"
fi
done
fi
}
# This function will be called if the script status is on enabled mode
apply() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE is installed"
else
crit "$PACKAGE is absent, installing it"
apt_install "$PACKAGE"
fi
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file "$FILE" "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
warn "$PATTERN is not present in $FILE, adding it"
does_pattern_exist_in_file "$FILE" "^${SSH_PARAM}"
if [ "$FNRET" != 0 ]; then
add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
else
info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
fi
/etc/init.d/ssh reload
fi
done
}
# This function will check config parameters required
@ -32,6 +77,19 @@ check_config() {
:
}
# This function will check config parameters required
create_config() {
cat <<EOF
status=audit
# Value of maxstartups
# 0: Number of unauthenticated connections before we start dropping
# 30: Percentage chance of dropping once we reach 10 (increases linearly for more than 10)
# 60: Maximum number of connections at which we start dropping everything
# Settles sshd maxstartups
OPTIONS='maxstartups=10:30:60'
EOF
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

59
bin/hardening/5.2.23_limit_ssh_max_sessions.sh
View File

@ -17,14 +17,59 @@ HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Limit SSH MaxSessions."
PACKAGE='openssh-server'
OPTIONS=''
FILE='/etc/ssh/sshd_config'
# This function will be called if the script status is on enabled / audit mode
audit() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" != 0 ]; then
crit "$PACKAGE is not installed!"
else
ok "$PACKAGE is installed"
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file $FILE "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
crit "$PATTERN is not present in $FILE"
fi
done
fi
}
# This function will be called if the script status is on enabled mode
apply() {
:
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE is installed"
else
crit "$PACKAGE is absent, installing it"
apt_install "$PACKAGE"
fi
for SSH_OPTION in $OPTIONS; do
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
does_pattern_exist_in_file "$FILE" "$PATTERN"
if [ "$FNRET" = 0 ]; then
ok "$PATTERN is present in $FILE"
else
warn "$PATTERN is not present in $FILE, adding it"
does_pattern_exist_in_file "$FILE" "^${SSH_PARAM}"
if [ "$FNRET" != 0 ]; then
add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
else
info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
fi
/etc/init.d/ssh reload
fi
done
}
# This function will check config parameters required
@ -32,6 +77,16 @@ check_config() {
:
}
# This function will check config parameters required
create_config() {
cat <<EOF
status=audit
# Value of maxsessions
# Settles sshd maxsessions
OPTIONS='maxsessions=10'
EOF
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default

13
tests/hardening/5.2.20_enable_ssh_pam.sh
View File

@ -7,5 +7,16 @@ test_audit() {
# shellcheck disable=2154
run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
# TODO fill comprehensive tests
describe Correcting situation
# `apply` performs a service reload after each change in the config file
# the service needs to be started for the reload to succeed
service ssh start
# if the audit script provides "apply" option, enable and run it
sed -i 's/audit/enabled/' /opt/debian-cis/etc/conf.d/"${script}".cfg
/opt/debian-cis/bin/hardening/"${script}".sh || true
describe Checking resolved state
register_test retvalshouldbe 0
register_test contain "[ OK ] ^usepam[[:space:]]*yes is present in /etc/ssh/sshd_config"
run resolved /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
}

13
tests/hardening/5.2.21_disable_ssh_allow_tcp_forwarding.sh
View File

@ -7,5 +7,16 @@ test_audit() {
# shellcheck disable=2154
run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
# TODO fill comprehensive tests
describe Correcting situation
# `apply` performs a service reload after each change in the config file
# the service needs to be started for the reload to succeed
service ssh start
# if the audit script provides "apply" option, enable and run it
sed -i 's/audit/enabled/' /opt/debian-cis/etc/conf.d/"${script}".cfg
/opt/debian-cis/bin/hardening/"${script}".sh || true
describe Checking resolved state
register_test retvalshouldbe 0
register_test contain "[ OK ] ^AllowTCPForwarding[[:space:]]*no is present in /etc/ssh/sshd_config"
run resolved /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
}

13
tests/hardening/5.2.22_configure_ssh_max_startups.sh
View File

@ -7,5 +7,16 @@ test_audit() {
# shellcheck disable=2154
run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
# TODO fill comprehensive tests
describe Correcting situation
# `apply` performs a service reload after each change in the config file
# the service needs to be started for the reload to succeed
service ssh start
# if the audit script provides "apply" option, enable and run it
sed -i 's/audit/enabled/' /opt/debian-cis/etc/conf.d/"${script}".cfg
/opt/debian-cis/bin/hardening/"${script}".sh || true
describe Checking resolved state
register_test retvalshouldbe 0
register_test contain "[ OK ] ^maxstartups[[:space:]]*10:30:60 is present in /etc/ssh/sshd_config"
run resolved /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
}

13
tests/hardening/5.2.23_limit_ssh_max_sessions.sh
View File

@ -7,5 +7,16 @@ test_audit() {
# shellcheck disable=2154
run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
# TODO fill comprehensive tests
describe Correcting situation
# `apply` performs a service reload after each change in the config file
# the service needs to be started for the reload to succeed
service ssh start
# if the audit script provides "apply" option, enable and run it
sed -i 's/audit/enabled/' /opt/debian-cis/etc/conf.d/"${script}".cfg
/opt/debian-cis/bin/hardening/"${script}".sh || true
describe Checking resolved state
register_test retvalshouldbe 0
register_test contain "[ OK ] ^maxsessions[[:space:]]*10 is present in /etc/ssh/sshd_config"
run resolved /opt/debian-cis/bin/hardening/"${script}".sh --audit-all
}