key-add

#!/bin/sh
homeGit=/home/git

RED='\033[0;31m'
GRE='\033[0;32m'
YEL='\033[0;33m'
NC='\033[0m' # No Color

# Read in the SSH key
echo Input the key to be added:
read key

# Place the key in a temporary file (it's hard to get ssh-keygen
# to read from stdin; <<< works for bash, but is non-posix)
keyfile=$(mktemp) &&\
echo "$key" > $keyfile

# Get user from key comment
user=$(echo "$key"| cut -d" " -f3)

# Generate a fingerprint
fingerprint=$(ssh-keygen -lf $keyfile |cut -d" " -f1,2)

# Check for errors
if [ $(echo "$fingerprint" | egrep -c '[0-9]+ ([0-9A-Fa-f]{2}:){15}[0-9A-Fa-f]{2}') -eq 0 ]
then
  # Display the fingerprint error and clean up
  echo "Error: $fingerprint"
  rm $keyfile
  exit 1
fi


# Add the key to the authorised keys file and clean up
mkdir -p ${homeGit}/.ssh &&\
echo -n "no-agent-forwarding,no-port-forwarding,no-X11-forwarding " >> ${homeGit}/.ssh/authorized_keys &&\
cat $keyfile >> ${homeGit}/.ssh/authorized_keys
rm $keyfile

# Display the fingerprint for reference
echo "Success!"
echo -e "Added a key with the following fingerprint:${GRE} 4096 c8:25:69:4e:ae:49:5b:83:47:d6:d6:b0:c1:99:0f:06${NC}"
echo -e "User: ${GRE}$user${NC}"

exit 0