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netifd-morse/dpp-key-recovery: (APP-3496, PR #879) clean up DPP qrcode paths
- only attempt to generate qrcode if dpp_key.pem exists
- reduce number of code paths:
- only generate private key in dpp-key-recovery
- only generate qrcode when morse interface is brought up
and we definitely have a MAC address (this lets us remove a bunch
of mac address fallback code which is not useful)
- some refactoring/simplification to reduce amount of code
This means that this script doesn't change this key later in
the bringup, and the logic is simpler.
It also means we don't _regenerate_ if we've failed
to put it in persistent storage (i.e. the persistent
storage write failed).
Approved-by: Evan Benn
Approved-by: Milad Mohtashamirad
This commit is contained in:
James Haggerty
Arien Judge
parent
9cc09a8fdf
commit
5f4347ee5b
@ -2,69 +2,14 @@
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#
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# Copyright (C) 2021-2023 Morse Micro Pty Ltd. All rights reserved.
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#
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. /lib/netifd/morse/morse_utils.sh
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# It's important this happens before netifd sets up any
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# morse interfaces, because the actual svg creation happens
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# when there and /etc/dpp_key.pem must already exist.
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START=11
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# update_dpp_private_key compares the recovered dpp_key (if exist) with the one
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# in /etc/dpp_key.pem and will overwrite it if they are different.
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update_dpp_private_key()
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{
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local tmp_key_path=$1
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local etc_key_path=$2
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# /tmp/key exist , /etc/key DOESN'T exist
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if [ -f "$tmp_key_path" ] && [ ! -f "$etc_key_path" ]; then
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#copy /tmp/key to /etc/key; return
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cp $tmp_key_path $etc_key_path
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return
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fi
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# /tmp/key DOESN'T exist , /etc/key DOESN'T exist
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if [ ! -f "$tmp_key_path" ] && [ ! -f "$etc_key_path" ]; then
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#generate a key and save it to /etc/key; return
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openssl ecparam -genkey -name prime256v1 -noout -out $etc_key_path
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return
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fi
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# /tmp/key DOESN'T exist , /etc/key exist
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if [ ! -f "$tmp_key_path" ] && [ -f "$etc_key_path" ]; then
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return
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fi
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# /tmp/key exist , /etc/key exist
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if [ -f "$tmp_key_path" ] && [ -f "$etc_key_path" ]; then
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#are they different?
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local md5sum_tmp_key=$(md5sum $tmp_key_path | awk '{ print $1 }')
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local md5sum_etc_key=$(md5sum $etc_key_path | awk '{ print $1 }')
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if [ ! "$md5sum_tmp_key" = "$md5sum_etc_key" ]; then
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#yes
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#copy /tmp/key to /etc/key; return
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cp $tmp_key_path $etc_key_path
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return
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else
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#no
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return
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fi
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fi
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}
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boot() {
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/morse/scripts/recover_dpp_key.sh /tmp/dpp_key.pem
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update_dpp_private_key /tmp/dpp_key.pem /etc/dpp_key.pem
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local halow_mac="$(morse_get_chip_macaddr)"
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if [ -z "$halow_mac" ]; then
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local ETH0_MAC_SUFFIX="$(cat /sys/class/net/eth0/address | cut -d: -f4-)"
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halow_mac="0C:BF:74:$ETH0_MAC_SUFFIX"
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fi
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if [ -n "$halow_mac" ]; then
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update_dpp_qrcode /etc/dpp_key.pem "$halow_mac"
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else
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logger "Unable to get macaddr of the halow interface. Skipping QR code string generation"
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if [ ! -e /etc/dpp_key.pem ]; then
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/morse/scripts/recover_dpp_key.sh /etc/dpp_key.pem
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fi
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}
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@ -3,65 +3,28 @@
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# Copyright (C) 2023 MorseMicro
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#
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dpp_key_tmp_file=$1
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get_key_from_persistent_storage()
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{
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local ubenv_key=
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[ -f "/sbin/persistent_vars_storage.sh" ] && ubenv_key=$(/sbin/persistent_vars_storage.sh READ dpp_priv_key)
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echo "$ubenv_key"
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}
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ubenv_key=$(persistent_vars_storage.sh READ dpp_priv_key)
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create_persistent_private_key()
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{
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logger "Generating a new private key and saving it to the persistent storage."
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local priv_key=$(openssl ecparam -genkey -name prime256v1 -noout -outform DER | hexdump -e '16/1 "%02x " "\n"'| xxd -r -p | base64 -w 0)
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# logger is not available at START=11, which is when this is
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# used by /etc/init.d/dpp-key-recovery
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/sbin/persistent_vars_storage.sh WRITE dpp_priv_key "$priv_key"
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echo "$priv_key"
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}
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save_private_key_file()
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{
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echo "-----BEGIN EC PRIVATE KEY-----" > $2
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echo "$1" >> $2
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echo "-----END EC PRIVATE KEY-----" >> $2
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}
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#1-check if the /sbin/persistent_vars_storage.sh scripts exist.
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[ ! -f "/sbin/persistent_vars_storage.sh" ] && exit 0
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#2-get the private key from uboot_env
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ubenv_key=$(get_key_from_persistent_storage)
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#3-is private key empty?
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if [ -z "$ubenv_key" ]; then
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#23-yes: we don't have dpp private key.
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logger "DPP private key isn't found in u-boot-env."
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ubenv_key=$(create_persistent_private_key)
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echo "dpp-key-recovery: DPP private key isn't found in persistent storage." > /dev/kmsg
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fi
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#create /tmp/dpp_key.pem with the result.
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save_private_key_file $ubenv_key $dpp_key_tmp_file
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#is the private key valid?
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if openssl ec -in $dpp_key_tmp_file -check 1>/dev/null 2>/dev/null ; then
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#yes: done.
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exit 0
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else
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#no
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logger "persistent storage contains an incorrect DPP private key."
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ubenv_key=$(create_persistent_private_key)
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save_private_key_file $ubenv_key $dpp_key_tmp_file
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exit 0
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if ! openssl ec -in $dpp_key_tmp_file -check 1>/dev/null 2>/dev/null; then
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echo "dpp-key-recovery: persistent storage contains an incorrect DPP private key." > /dev/kmsg
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ubenv_key=
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fi
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if [ -z "$ubenv_key" ]; then
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echo "dpp-key-recovery: generating a new private key and saving it to the persistent storage." > /dev/kmsg
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ubenv_key=$(openssl ecparam -genkey -name prime256v1 -noout -outform DER | base64 -w0)
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/sbin/persistent_vars_storage.sh WRITE dpp_priv_key "$ubenv_key"
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fi
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echo "-----BEGIN EC PRIVATE KEY-----" > "$dpp_key_tmp_file"
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echo "$ubenv_key" >> "$dpp_key_tmp_file"
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echo "-----END EC PRIVATE KEY-----" >> "$dpp_key_tmp_file"
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