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Add Secure Boot Kernel configuration (#298)
* [secure boot]Add Linux Kernel configuration to support Secure Boot feature & Secure warmboot * [secure boot]Fix few typos * [secure boot]Fix Secure boot build flag condition by adding an extra defined verification * [secure boot]Remove WA after the fix in commit 5717c5d. The flow now will modify the kconfig-inclusions/exclusions file if the Secure Boot is enabled only. * [secure boot]Add secure boot kernel config by using kconfig-secure-boot-exclusions and patch/kconfig-secure-boot-inclusions files with manage-config. * [secure boot]removed comment, rename certificate with the name of the default debian key path. * [secure boot]Fix equal condition and add input file validation to certificate * [secure boot]Add signature force flag in kernel config, to force kernel module verification --------- Co-authored-by: Saikrishna Arcot <[email protected]>
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‎Makefile

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,8 @@ KERNEL_VERSION ?= 5.10.140
99
KERNEL_SUBVERSION ?= 1
1010
kernel_procure_method ?= build
1111
CONFIGURED_ARCH ?= amd64
12+
SECURE_UPGRADE_MODE ?=
13+
SECURE_UPGRADE_DEV_SIGNING_CERT =?
1214

1315
LINUX_HEADER_COMMON = linux-headers-$(KVERSION_SHORT)-common_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_all.deb
1416
LINUX_HEADER_AMD64 = linux-headers-$(KVERSION)_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_$(CONFIGURED_ARCH).deb
@@ -123,7 +125,7 @@ $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
123125

124126
# Optionally add/remove kernel options
125127
if [ -f ../manage-config ]; then
126-
../manage-config $(CONFIGURED_ARCH) $(CONFIGURED_PLATFORM)
128+
../manage-config $(CONFIGURED_ARCH) $(CONFIGURED_PLATFORM) $(SECURE_UPGRADE_MODE) $(SECURE_UPGRADE_DEV_SIGNING_CERT)
127129
fi
128130

129131
# Building a custom kernel from Debian kernel source

‎manage-config

Lines changed: 114 additions & 70 deletions
Original file line numberDiff line numberDiff line change
@@ -26,12 +26,21 @@
2626
# Configuration file to change
2727
ARCH=amd64
2828
PLATFORM=
29+
SECURE_UPGRADE_MODE="no_sign"
30+
SECURE_UPGRADE_DEV_SIGNING_CERT=
2931
if [ $# -ge 1 ]; then
3032
ARCH=$1
3133
fi
3234
if [ $# -ge 2 ]; then
3335
PLATFORM=$2
3436
fi
37+
if [ $# -ge 3 ]; then
38+
SECURE_UPGRADE_MODE=$3
39+
fi
40+
if [ $# -ge 4 ]; then
41+
SECURE_UPGRADE_DEV_SIGNING_CERT=$4
42+
fi
43+
3544
case "$ARCH" in
3645
amd64)
3746
CONFIG_FILE_LOC=debian/build/build_amd64_none_amd64
@@ -58,88 +67,123 @@ function get_section_opts(){
5867
echo "$opts"
5968
}
6069

61-
ret=0
62-
exclusion_file="../patch/kconfig-exclusions"
63-
inclusion_file="../patch/kconfig-inclusions"
64-
force_inclusion_file="../patch/kconfig-force-inclusions"
65-
if [ -e ${exclusion_file} -o -e ${inclusion_file} -o -e ${force_inclusion_file} ]; then
66-
67-
# Process any exclusions in the kernel
68-
if [ -f ${exclusion_file} ]; then
69-
exclusion_opts=$(get_section_opts ${exclusion_file} "common" ${ARCH} ${PLATFORM})
70-
while read -r opt; do
71-
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
72-
scripts/config --file ${CONFIG_FILE} -d $opt
73-
fi
74-
done <<< ${exclusion_opts};
75-
fi
70+
function process_inclusion_exclusion_files(){
71+
echo "process_inclusion_exclusion_files Start"
72+
ret=0
73+
echo "debug ret=$ret 1"
74+
if [ -e ${exclusion_file} -o -e ${inclusion_file} -o -e ${force_inclusion_file} ]; then
7675

77-
# Process any inclusions in the kernel
78-
if [ -f ${inclusion_file} ]; then
79-
inclusion_opts=$(get_section_opts ${inclusion_file} "common" ${ARCH} ${PLATFORM})
80-
while read -r opt; do
81-
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
82-
n=${opt%=*}
83-
v="${opt#*=}"
84-
scripts/config --file ${CONFIG_FILE} -k --set-val "$n" "$v"
85-
fi
86-
done <<< ${inclusion_opts};
87-
fi
76+
# Process any exclusions in the kernel
77+
if [ -f ${exclusion_file} ]; then
78+
exclusion_opts=$(get_section_opts ${exclusion_file} "common" ${ARCH} ${PLATFORM})
79+
while read -r opt; do
80+
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
81+
scripts/config --file ${CONFIG_FILE} -d $opt
82+
fi
83+
done <<< ${exclusion_opts};
84+
fi
8885

89-
# Update the .config file to be sure it's consistent
90-
make -C ${CONFIG_FILE_LOC} olddefconfig
86+
# Process any inclusions in the kernel
87+
if [ -f ${inclusion_file} ]; then
88+
inclusion_opts=$(get_section_opts ${inclusion_file} "common" ${ARCH} ${PLATFORM})
89+
while read -r opt; do
90+
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
91+
n=${opt%=*}
92+
v="${opt#*=}"
93+
scripts/config --file ${CONFIG_FILE} -k --set-val "$n" "$v"
94+
fi
95+
done <<< ${inclusion_opts};
96+
fi
9197

92-
# Verify that the kernel options we want to remove are not in the updated configuration
93-
if [ -f ${exclusion_file} ]; then
94-
echo
95-
echo "Checking removed kernel options..."
96-
while read -r opt; do
97-
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
98-
s=$(scripts/config --file ${CONFIG_FILE} -k --state $opt)
99-
if [ ! "$s" = "undef" -a ! "$s" = "n" ]; then
100-
ret=1
101-
echo "Option $opt should not be set, but is set to [$s]"
98+
# Update the .config file to be sure it's consistent
99+
make -C ${CONFIG_FILE_LOC} olddefconfig
100+
101+
# Verify that the kernel options we want to remove are not in the updated configuration
102+
if [ -f ${exclusion_file} ]; then
103+
echo
104+
echo "Checking removed kernel options..."
105+
while read -r opt; do
106+
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
107+
s=$(scripts/config --file ${CONFIG_FILE} -k --state $opt)
108+
if [ ! "$s" = "undef" -a ! "$s" = "n" ]; then
109+
ret=1
110+
echo "Option $opt should not be set, but is set to [$s]"
111+
fi
102112
fi
113+
done <<< ${exclusion_opts};
114+
if [ $ret = 0 ]; then
115+
echo "No error"
103116
fi
104-
done <<< ${exclusion_opts};
105-
if [ $ret = 0 ]; then
106-
echo "No error"
107117
fi
108-
fi
109118

110-
# Verify that the kernel options we want to add are now in the updated configuration
111-
if [ -f ${inclusion_file} ]; then
112-
echo
113-
echo "Checking added kernel options..."
114-
while read -r opt; do
115-
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
116-
n=${opt%=*}
117-
v="${opt#*=}"
118-
v="${v/#\"/}"
119-
v="${v/%\"/}"
120-
s=$(scripts/config --file ${CONFIG_FILE} -k --state $n)
121-
if [ ! "$s" = "$v" ]; then
122-
ret=2
123-
echo "Option $n should be set to [$v] instead of [$s]"
119+
# Verify that the kernel options we want to add are now in the updated configuration
120+
if [ -f ${inclusion_file} ]; then
121+
echo
122+
echo "Checking added kernel options..."
123+
while read -r opt; do
124+
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
125+
n=${opt%=*}
126+
v="${opt#*=}"
127+
v="${v/#\"/}"
128+
v="${v/%\"/}"
129+
s=$(scripts/config --file ${CONFIG_FILE} -k --state $n)
130+
if [ ! "$s" = "$v" ]; then
131+
ret=2
132+
echo "Option $n should be set to [$v] instead of [$s]"
133+
fi
124134
fi
135+
done <<< ${inclusion_opts};
136+
if [ ! $ret = 2 ]; then
137+
echo "No error"
125138
fi
126-
done <<< ${inclusion_opts};
127-
if [ ! $ret = 2 ]; then
128-
echo "No error"
129139
fi
130-
fi
131140

132-
# Process any force inclusions in the kernel
133-
if [ -f ${force_inclusion_file} ]; then
134-
force_inclusion_opts=$(get_section_opts ${force_inclusion_file} "common" ${ARCH} ${PLATFORM})
135-
while read -r opt; do
136-
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
137-
echo $opt >> ${CONFIG_FILE}
138-
fi
139-
done <<< ${force_inclusion_opts};
141+
# Process any force inclusions in the kernel
142+
if [ -f ${force_inclusion_file} ]; then
143+
force_inclusion_opts=$(get_section_opts ${force_inclusion_file} "common" ${ARCH} ${PLATFORM})
144+
while read -r opt; do
145+
if [ ! -z "$opt" ] && [[ ! "$opt" =~ ^#.* ]]; then
146+
echo $opt >> ${CONFIG_FILE}
147+
fi
148+
done <<< ${force_inclusion_opts};
149+
fi
150+
151+
echo
140152
fi
141153

142-
echo
154+
echo "process_inclusion_exclusion_files Done"
155+
return $ret
156+
}
157+
158+
exclusion_file="../patch/kconfig-exclusions"
159+
inclusion_file="../patch/kconfig-inclusions"
160+
force_inclusion_file="../patch/kconfig-force-inclusions"
161+
ret_process_inc_ex=0
162+
ret_process_inc_ex=$(process_inclusion_exclusion_files > /dev/null; echo $?)
163+
164+
# Secure Boot support
165+
if [ $ret_process_inc_ex -eq 0 ]; then
166+
echo "Secure Boot params: SECURE_UPGRADE_MODE=${SECURE_UPGRADE_MODE}, SECURE_UPGRADE_DEV_SIGNING_CERT=${SECURE_UPGRADE_DEV_SIGNING_CERT}"
167+
if [ ${SECURE_UPGRADE_MODE} == "dev" -o ${SECURE_UPGRADE_MODE} == "prod" ]; then
168+
echo "set kconfig-secure-boot-exclusions & kconfig-secure-boot-inclusions"
169+
170+
if [ ! -f "${SECURE_UPGRADE_DEV_SIGNING_CERT}" ]; then
171+
echo "ERROR: SECURE_UPGRADE_DEV_SIGNING_CERT=${SECURE_UPGRADE_DEV_SIGNING_CERT} file does not exist"
172+
exit 1
173+
fi
174+
175+
exclusion_file="../patch/kconfig-secure-boot-exclusions"
176+
inclusion_file="../patch/kconfig-secure-boot-inclusions"
177+
force_inclusion_file="../patch/kconfig-force-secure-boot-inclusions"
178+
179+
# save the new pub key in kernel
180+
sed -i "s|^CONFIG_SYSTEM_TRUSTED_KEYS=.*|CONFIG_SYSTEM_TRUSTED_KEYS=\"$SECURE_UPGRADE_DEV_SIGNING_CERT\"|g" ${inclusion_file}
181+
182+
ret_process_inc_ex=$(process_inclusion_exclusion_files > /dev/null; echo $?)
183+
echo "Secure Boot kernel configuration done."
184+
else
185+
echo "no Secure Boot Kernel configuration required."
186+
fi
143187
fi
144188

145-
exit $ret
189+
exit $ret_process_inc_ex

‎patch/kconfig-secure-boot-exclusions

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
1+
[common]
2+
3+
[amd64]
4+
CONFIG_MODULE_SIG_SHA256
5+
# For mellanox
6+
CONFIG_SECURITY_LOCKDOWN_LSM
7+
CONFIG_SECURITY_LOCKDOWN_LSM_EARLY
8+
CONFIG_LOCK_DOWN_KERNEL_FORCE_NONE
9+
CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT
10+
11+
[arm64]
12+
CONFIG_MODULE_SIG_SHA256
13+
# For mellanox
14+
CONFIG_SECURITY_LOCKDOWN_LSM
15+
CONFIG_SECURITY_LOCKDOWN_LSM_EARLY
16+
CONFIG_LOCK_DOWN_KERNEL_FORCE_NONE
17+
CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT
18+
19+
[armhf]
20+
21+
[marvell-armhf]

‎patch/kconfig-secure-boot-inclusions

Lines changed: 19 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,19 @@
1+
[common]
2+
3+
[amd64]
4+
CONFIG_SYSTEM_TRUSTED_KEYS="debian/certs/debian-uefi-certs.pem"
5+
CONFIG_MODULE_SIG_HASH="sha512"
6+
CONFIG_MODULE_SIG_SHA512=y
7+
CONFIG_KEXEC_SIG_FORCE=y
8+
CONFIG_MODULE_SIG_FORCE=y
9+
10+
[arm64]
11+
CONFIG_SYSTEM_TRUSTED_KEYS="debian/certs/debian-uefi-certs.pem"
12+
CONFIG_MODULE_SIG_HASH="sha512"
13+
CONFIG_MODULE_SIG_SHA512=y
14+
CONFIG_KEXEC_SIG_FORCE=y
15+
CONFIG_MODULE_SIG_FORCE=y
16+
17+
[armhf]
18+
19+
[marvell-armhf]

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