generate nginx deny ips conf

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
-name = "ngxden"
+name = "ufwban"
-description = "Generate a deny Nginx conf based on Nginx access logs"
+description = "A little CLI tool that read Nginx access logs and block ip based on simple rules."
 
 authors = [
 	 {name = "rmanach", email = "manach.r@msn.com"},

ufwban.py

@@ -17,6 +17,7 @@ logging.basicConfig(
     handlers=(stdout_handler, rotate_handler),
 )
 
+NGINX_DENY_CONF = "/etc/nginx/conf.d/blocked-ips.conf"
 NGINX_ACCESS_LOGS_DIR = "/var/log/nginx"
 UFW_CONF = "conf.json"
 
@@ -262,6 +263,51 @@ def get_logs_to_deny(logs: list[NginxLog], rules: Rules) -> dict[str, NginxLog]:
     return filter_logs
 
 
+def get_nginx_denied_ips() -> list[str]:
+    denied_ips = []
+
+    try:
+        with open(NGINX_DENY_CONF, "r") as f:
+            while line := f.readline():
+                parts = line.split(" ")
+                if len(parts) != 2:
+                    logging.error(f"unable to parse line: {line} in {NGINX_DENY_CONF}")
+                    continue
+
+                if parts[0].lower() != "deny":
+                    logging.warning(f"not a deny rule: {line} in {NGINX_DENY_CONF}")
+                    continue
+
+                denied_ips.append(parts[2][:-1])
+    except FileNotFoundError:
+        logging.warning(f"{NGINX_DENY_CONF} does not exist")
+
+    return denied_ips
+
+
+def gen_nginx_conf(dry_run: bool = False):
+    """Generate an Nginx conf with a list a IP to deny"""
+    rules = Rules.from_conf()
+
+    logs = parse_nginx_logs()
+    ips_to_deny = [ip for ip in get_logs_to_deny(logs, rules).keys()]
+    ips_denied = get_nginx_denied_ips()
+
+    ips = set(ips_to_deny) | set(ips_denied)
+    if not len(ips):
+        logging.info("no ip to deny")
+        return
+
+    with open(f"{NGINX_DENY_CONF}.tmp", "w") as f:
+        for ip in ips:
+            f.write(f"deny {ip};\n")
+        f.write("allow all;\n")
+
+    if not dry_run:
+        os.rename(f"{NGINX_DENY_CONF}.tmp", f"{NGINX_DENY_CONF}")
+        logging.info(f"deny Nginx conf installed: {NGINX_DENY_CONF}")
+
+
 def main(refresh: bool = False, reload: bool = False, dry_run: bool = False):
     rules = Rules.from_conf()
 
@@ -329,6 +375,12 @@ if __name__ == "__main__":
     parser.add_argument(
         "--reload", action="store_true", default=False, help="Reload the UFW firewall"
     )
+    parser.add_argument(
+        "--to-nginx",
+        action="store_true",
+        default=False,
+        help="Generate an Nginx deny configuration",
+    )
     parser.add_argument(
         "--live", action="store_true", default=False, help="Read inputs from stdin"
     )
@@ -339,7 +391,9 @@ if __name__ == "__main__":
 
     exit_code = 0
     try:
-        if args.live:
+        if args.to_nginx:
+            gen_nginx_conf()
+        elif args.live:
             live(args.dry_run)
         else:
             main(args.refresh, args.reload, args.dry_run)