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base-files: add mtd_get_mac_encrypted_arcadyan function

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Some Arcadyan devices (e.g. MTS WG430223) keep their config in encrypted
mtd. This adds mtd_get_mac_encrypted_arcadyan() function to get the MAC
address from the encrypted partition. Function uses uencrypt utility for
decryption (and openssl if the uencrypt wasn't found).

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
This commit is contained in:
Mikhail Zhilkin 2022-07-12 14:52:04 +00:00 committed by Christian Marangi
parent 9c8605dee2
commit 12c971bc26
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1 changed files with 31 additions and 0 deletions
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package/base-files/files/lib/functions/system.sh
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@ -79,6 +79,37 @@ mtd_get_mac_ascii() {
[ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
}
mtd_get_mac_encrypted_arcadyan() {
local iv="00000000000000000000000000000000"
local key="2A4B303D7644395C3B2B7053553C5200"
local mac_dirty
local mtdname="$1"
local part
local size
part=$(find_mtd_part "$mtdname")
if [ -z "$part" ]; then
echo "mtd_get_mac_encrypted_arcadyan: partition $mtdname not found!" >&2
return
fi
# Config decryption and getting mac. Trying uencrypt and openssl utils.
size=$((0x$(dd if=$part skip=9 bs=1 count=4 2>/dev/null | hexdump -v -e '1/4 "%08x"')))
if [[ -f "/usr/bin/uencrypt" ]]; then
mac_dirty=$(dd if=$part bs=1 count=$size skip=$((0x100)) 2>/dev/null | \
uencrypt -d -n -k $key -i $iv | grep mac | cut -c 5-)
elif [[ -f "/usr/bin/openssl" ]]; then
mac_dirty=$(dd if=$part bs=1 count=$size skip=$((0x100)) 2>/dev/null | \
openssl aes-128-cbc -d -nopad -K $key -iv $iv | grep mac | cut -c 5-)
else
echo "mtd_get_mac_encrypted_arcadyan: Neither uencrypt nor openssl was found!" >&2
return
fi
# "canonicalize" mac
[ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
}
mtd_get_mac_text() {
local mtdname=$1
local offset=$(($2))