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Changes to disguise as image script

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This commit is contained in:
Jonathan Hodgson 2019-09-24 17:07:24 +01:00
parent 339ba9e889
commit 26023c5a4c
5 changed files with 11 additions and 19 deletions
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25
bin/.bin/payload-generation/disguiseAsImage
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@ -8,8 +8,12 @@ CURRENT=$(pwd)
PAYLOAD="$1"
IMAGETYPE="${2:-jpg}"
# Make sure the image type is lower case
IMAGETYPE=$(echo "$IMAGETYPE" | tr '[:upper:]' '[:lower:]')
IMAGETYPE=$(echo "$IMAGETYPE" | tr '[:lower:]' '[:upper:]')
# Hex encoded versions of the magic bytes of images
MAGIC_GIF='47494638396140004000e7ff0002050101070a0d'
MAGIC_JPG='ffd8ffe000104a46494600010101012c012c0000'
MAGIC_PNG='89504e470d0a1a0a0000000d49484452000000400a'
# This function prints the usage
function printUsage(){
echo "Usage: $(basename "$0") PAYLOAD TYPE"
@ -31,26 +35,19 @@ function getPayload(){
fi
}
function getTemplate(){
local template="$SCRIPTPATH/templates/payload.$IMAGETYPE"
echo "$template"
if [ -f "$template" ]; then
exit 0
else
exit 1
fi
}
function getDestination(){
echo "$CURRENT/$PAYLOAD.$IMAGETYPE"
local ext=$(echo "$IMAGETYPE" | tr '[:upper:]' '[:lower:]')
echo "$CURRENT/$PAYLOAD.$ext"
exit 0
}
if template=$(getTemplate); then
eval template="\$MAGIC_$IMAGETYPE"
if [ -n "$template" ]; then
if payload=$(getPayload); then
# Do copy stuff
destination=$(getDestination)
cp "$template" "$destination"
echo "$template" | xxd -r -p > "$destination"
cat "$payload" >> $destination
else
"No such payload $payload"