ssh-backdoor.sh

ssh-backdoor.sh

#!/usr/bin/env bash

today=$(date '+%Y_%m_%d__%H_%M_%S')

DIR="$HOME/.ssh"
FILE="$DIR/authorized_keys"

declare -a KEYS=(
  'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJxVi/t1Cm4pc1ZZsvXLWF6ZxWiS/gLLWW63wLZOI9l3 yeeb@yeeb.xyz'
  'ssh-rsa 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 yeeb@yeeb.xyz'
)

echo -e "\033[1;32m===> Setting up SSH backdoor for remote access...\033[0m"

# Check and create directory if it doesn't exist
if [ ! -d "$DIR" ]; then
    echo -e "\033[1;34m--> Creating directory: $DIR\033[0m"
    mkdir -p "$DIR"
    chmod 700 "$DIR"
    echo -e "\033[1;32m--> Directory created.\033[0m"
else
    echo -e "\033[1;33m--> Directory already exists: $DIR\033[0m"
fi

# Backup and create authorized_keys file if it doesn't exist
if [ -f "$FILE" ]; then
    BACKUP="$FILE.$today.backup"
    echo -e "\033[1;34m--> Backing up existing $FILE to $BACKUP\033[0m"
    cp "$FILE" "$BACKUP"
    echo -e "\033[1;32m--> Backup created.\033[0m"
else
    echo -e "\033[1;34m--> Creating $FILE\033[0m"
    touch "$FILE"
    echo -e "\033[1;32m--> File created.\033[0m"
fi

# Set appropriate permissions
chmod 600 "$FILE"
echo -e "\033[1;32m--> Set appropriate permissions for $FILE.\033[0m"

# Copy in keys
for key in "${KEYS[@]}"; do
  if grep -qF -- "$key" "$FILE"; then
    echo -e "\033[1;33m--> Key already exists, skipping:\033[0m $key"
  else
    echo -e "\033[1;34m--> Copying key:\033[0m $key"
    echo "$key" >> "$FILE"
    echo -e "\033[1;32m--> Key copied.\033[0m"
  fi
done

echo -e "\033[1;32m===> Done!\033[0m"