add: hci

playground.sh

@@ -0,0 +1,141 @@
+#!/bin/sh
+# ssh_passwordless_manager.sh
+# Manage passwordless SSH hosts: list, add, delete, edit, query.
+
+CONFIG_FILE="$HOME/.ssh_playground_hosts"
+
+# Ensure config file exists
+touch "$CONFIG_FILE"
+
+# Print usage information
+usage() {
+  cat <<EOF
+Usage: $(basename "$0") <command> [options]
+
+Commands:
+  list                          List all hosts configured for SSH connection
+  add <alias> <user@host> <priv_key> [pub_key]
+                                Add a new host; installs public key and saves config
+  delete <alias>                Remove a host; deletes key from remote and config
+  edit <alias> <new_priv_key> [new_pub_key]
+                                Replace the key for a given host
+  query <alias>                 Show the configuration for a given host
+  help                          Show this help message
+EOF
+  exit 1
+}
+
+# Load entry by alias
+load_entry() {
+  grep "^$1|" "$CONFIG_FILE"
+}
+
+# List hosts
+list_hosts() {
+  if [ ! -s "$CONFIG_FILE" ]; then
+    echo "No hosts configured."
+    exit 0
+  fi
+  printf "%-15s %-25s %s\n" "ALIAS" "USER@HOST" "PRIVATE_KEY"
+  echo "---------------------------------------------------------------"
+  while IFS='|' read -r alias userhost privkey pubkey; do
+    printf "%-15s %-25s %s\n" "$alias" "$userhost" "$privkey"
+  done < "$CONFIG_FILE"
+}
+
+# Add host
+add_host() {
+  [ $# -lt 3 ] && echo "add requires alias, user@host, private key" && usage
+  alias="$1"; userhost="$2"; privkey="$3"; pubkey="$4"
+  [ -z "$pubkey" ] && pubkey="${privkey}.pub"
+
+  if load_entry "$alias" >/dev/null; then
+    echo "Alias '$alias' already exists." && exit 1
+  fi
+
+  # Copy public key to remote
+  echo "Installing public key to $userhost..."
+  ssh-copy-id -i "$pubkey" "$userhost" || { echo "Failed to install key."; exit 1; }
+
+  # Save to config
+  echo "$alias|$userhost|$privkey|$pubkey" >> "$CONFIG_FILE"
+  echo "Host '$alias' added."
+}
+
+# Delete host
+delete_host() {
+  [ $# -lt 1 ] && echo "delete requires alias" && usage
+  alias="$1"
+  entry=$(load_entry "$alias")
+  [ -z "$entry" ] && echo "Alias '$alias' not found." && exit 1
+
+  IFS='|' read -r _ userhost privkey pubkey <<EOF
+$entry
+EOF
+
+  # Read public key content
+  pubcontent=$(sed -n '1p' "$pubkey")
+
+  # Remove key from remote authorized_keys
+  echo "Removing public key from $userhost..."
+  ssh "$userhost" "mkdir -p ~/.ssh && chmod 700 ~/.ssh && \
+    grep -v '$pubcontent' ~/.ssh/authorized_keys > ~/.ssh/authorized_keys.tmp && \
+    mv ~/.ssh/authorized_keys.tmp ~/.ssh/authorized_keys" || echo "Warning: could not remove key on remote."
+
+  # Remove from config
+  grep -v "^$alias|" "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"
+  echo "Host '$alias' deleted."
+}
+
+# Edit host key
+edit_host() {
+  [ $# -lt 2 ] && echo "edit requires alias and new private key" && usage
+  alias="$1"; newpriv="$2"; newpub="$3"
+  [ -z "$newpub" ] && newpub="${newpriv}.pub"
+  entry=$(load_entry "$alias")
+  [ -z "$entry" ] && echo "Alias '$alias' not found." && exit 1
+
+  IFS='|' read -r _ userhost oldpriv oldpub <<EOF
+$entry
+EOF
+
+  # Remove old key
+  oldcontent=$(sed -n '1p' "$oldpub")
+  echo "Removing old key from $userhost..."
+  ssh "$userhost" "grep -v '$oldcontent' ~/.ssh/authorized_keys > ~/.ssh/authorized_keys.tmp && mv ~/.ssh/authorized_keys.tmp ~/.ssh/authorized_keys" || echo "Warning: could not remove old key."
+
+  # Install new key
+  echo "Installing new public key to $userhost..."
+  ssh-copy-id -i "$newpub" "$userhost" || { echo "Failed to install new key."; exit 1; }
+
+  # Update config
+  grep -v "^$alias|" "$CONFIG_FILE" > "$CONFIG_FILE.tmp"
+  echo "$alias|$userhost|$newpriv|$newpub" >> "$CONFIG_FILE.tmp"
+  mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"
+  echo "Host '$alias' updated."
+}
+
+# Query host
+query_host() {
+  [ $# -lt 1 ] && echo "query requires alias" && usage
+  alias="$1"
+  entry=$(load_entry "$alias")
+  [ -z "$entry" ] && echo "Alias '$alias' not found." && exit 1
+  IFS='|' read -r _ userhost privkey pubkey <<EOF
+$entry
+EOF
+  echo "Alias    : $alias"
+  echo "Host     : $userhost"
+  echo "Priv key : $privkey"
+  echo "Pub key  : $pubkey"
+}
+
+# Main dispatch
+case "$1" in
+  list)   list_hosts ;; 
+  add)    shift; add_host "$@" ;; 
+  delete) shift; delete_host "$@" ;; 
+  edit)   shift; edit_host "$@" ;; 
+  query)  shift; query_host "$@" ;; 
+  help|*) usage ;; 
+ esac