From d856596e055e0c87de6719a4b5560810c3dbd733 Mon Sep 17 00:00:00 2001
From: midefos <midefos@gmail.com>
Date: Sun, 12 May 2024 13:46:11 +0200
Subject: [PATCH] first commit with test logic

---
 .gitignore           |   2 +
 Cargo.lock           | 765 +++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml           |  11 +
 Dockerfile           |  16 +
 docker-compose.yml   |  15 +
 src/login_attempt.rs |  15 +
 src/main.rs          |  51 +++
 7 files changed, 875 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 Dockerfile
 create mode 100644 docker-compose.yml
 create mode 100644 src/login_attempt.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..90fcc0c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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+*.env
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..cac22a3
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,765 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cf496cd
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "martillo-maldito"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+iptables = "0.5.1"
+linemux = "0.3.0"
+regex = "1.10.4"
+tokio = { version = "1.37.0", features = ["macros", "rt", "rt-multi-thread", "signal"]}
+openssl = { version = "0.10.64", features = ["vendored"] }
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..1159205
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM rust:latest as builder
+
+RUN rustup target add x86_64-unknown-linux-musl
+RUN apt update && apt install -y musl-tools musl-dev
+RUN update-ca-certificates
+
+COPY . .
+
+RUN cargo build --target x86_64-unknown-linux-musl --release
+
+FROM ubuntu:latest
+
+RUN apt update && apt upgrade -y && apt install iptables iptables-persistent -y
+COPY --from=builder /target/x86_64-unknown-linux-musl/release/martillo-maldito ./
+
+CMD ["/martillo-maldito"]
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..5ee9f66
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,15 @@
+version: "3.9"
+
+services:
+  martillo-maldito:
+    image: martillo-maldito:latest
+    restart: always
+    build:
+      context: .
+    
+    cap_add:
+      - NET_ADMIN
+      - NET_RAW
+
+    volumes:
+      - /var/log/auth.log:/host_ssh/auth.log
diff --git a/src/login_attempt.rs b/src/login_attempt.rs
new file mode 100644
index 0000000..44eae93
--- /dev/null
+++ b/src/login_attempt.rs
@@ -0,0 +1,15 @@
+pub struct LoginAttempt {
+    pub ip: String,
+    user: String,
+    port: String,
+}
+
+impl LoginAttempt {
+    pub fn new(ip: &str, user: &str, port: &str) -> Self {
+        Self {
+            ip: ip.to_string(),
+            user: user.to_string(),
+            port: port.to_string(),
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7530727
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,51 @@
+pub mod login_attempt;
+
+use linemux::MuxedLines;
+use login_attempt::LoginAttempt;
+use regex::Regex;
+use std::collections::HashMap;
+
+#[tokio::main]
+async fn main() -> std::io::Result<()> {
+    let iptables = iptables::new(false).unwrap();
+    let mut lines = MuxedLines::new()?;
+    lines.add_file("/host_ssh/auth.log").await?;
+    let mut login_attempts: HashMap<String, usize> = HashMap::new();
+
+    println!("Listening to changes over /host_ssh/auth.log");
+    while let Ok(Some(line)) = lines.next_line().await {
+        if let Some(login_attempt) = capture_failed_login_attempt(line.line()) {
+            match login_attempts.get_mut(&login_attempt.ip) {
+                Some(count) => {
+                    *count += 1;
+
+                    if *count == 3 {
+                        iptables
+                            .append_unique(
+                                "filter",
+                                "INPUT",
+                                &format!("--source {} -j DROP", login_attempt.ip),
+                            )
+                            .unwrap();
+                        login_attempts.remove(&login_attempt.ip);
+                        println!("{} banned", login_attempt.ip);
+                    }
+                }
+                None => {
+                    login_attempts.insert(login_attempt.ip.clone(), 1);
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
+fn capture_failed_login_attempt(line: &str) -> Option<LoginAttempt> {
+    let regex = Regex::new(r#"Failed password for (?:invalid user )?(?P<user>\S+) from (?P<ip>\S+) port (?P<port>\d+)"#).unwrap();
+    let captured = regex.captures(line)?;
+    Some(LoginAttempt::new(
+        captured.name("ip").unwrap().as_str(),
+        captured.name("user").unwrap().as_str(),
+        captured.name("port").unwrap().as_str(),
+    ))
+}