Add the snuffleupagus module, with default config

build.sh

@@ -17,6 +17,19 @@ PACKAGES="
   php-mbstring
   php-mysql
   php-gd
+  snuffleupagus
+"
+
+PHP_ENABLE_MODULES="
+	snuffleupagus
+"
+
+# Remove access to SYSV IPC to avoid DoS possibilities (Apache
+# uses SYSV shared memory).
+PHP_DISABLE_MODULES="
+	sysvmsg
+	sysvsem
+	sysvshm
 "
 
 # The default bitnami/minideb image defines an 'install_packages'
@@ -45,6 +58,14 @@ echo "export PHP_FPM_EXPORTER_PORT=\`expr \$APACHE_PORT + 200\`" >> /etc/apache2
 a2enmod proxy_fcgi setenvif
 a2enconf -q php7.4-fpm
 
+# Enable / disable chosen PHP modules.
+for m in ${PHP_DISABLE_MODULES}; do
+    phpdismod -v ALL -s ALL $m
+done
+for m in ${PHP_ENABLE_MODULES}; do
+    phpenmod -v ALL -s ALL $m
+done
+
 # Rsync our configuration, on top of /etc.
 rsync -a /tmp/conf/ /etc/
 

conf/php/7.4/mods-available/snuffleupagus.ini

+extension=snuffleupagus.so
+sp.configuration_file=/etc/php/snuffleupagus/*.rules
+

conf/php/snuffleupagus/snuffleupagus.rules

+# This is the default configuration file for Snuffleupagus (https://snuffleupagus.rtfd.io).
+# It contains "reasonable" defaults that won't break your websites,
+# and a lot of commented directives that you can enable if you want to 
+# have a better protection.
+
+# Harden the PRNG
+sp.harden_random.enable();
+
+# Disabled XXE
+sp.disable_xxe.enable();
+
+# Global configuration variables
+# sp.global.secret_key("YOU _DO_ NEED TO CHANGE THIS WITH SOME RANDOM CHARACTERS.");
+
+# Globally activate strict mode
+# https://secure.php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration.strict
+# sp.global_strict.enable();
+
+# Prevent unserialize-related exploits
+sp.unserialize_hmac.enable();
+
+# Only allow execution of read-only files. This is a low-hanging fruit that you should enable.
+sp.readonly_exec.enable();
+
+# Php has a lot of wrappers, most of them aren't usually useful, you should 
+# only enable the ones you're using.
+# sp.wrappers_whitelist.list("file,php,phar");
+
+# Prevent sloppy comparisons.
+# sp.sloppy_comparison.enable();
+
+# use SameSite on session cookie
+# https://snuffleupagus.readthedocs.io/features.html#protection-against-cross-site-request-forgery
+sp.cookie.name("PHPSESSID").samesite("lax");
+
+# Harden the `chmod` function
+sp.disable_function.function("chmod").param("mode").value_r("^[0-9]{2}[67]$").drop();
+
+# Prevent various `mail`-related vulnerabilities
+sp.disable_function.function("mail").param("additional_parameters").value_r("\\-").drop();
+
+# Since it's now burned, me might as well mitigate it publicly
+sp.disable_function.function("putenv").param("setting").value_r("LD_").drop()
+
+# This is also burned:
+# ini_set('open_basedir','..');chdir('..');…;chdir('..');ini_set('open_basedir','/');echo(file_get_contents('/etc/passwd'));
+# Since we have no way of matching on two parameters at the same time, we're
+# blocking calls to open_basedir altogether: nobody is using it via ini_set anyway.
+# Moreover, there are non-public bypasses that are also using this vector ;)
+sp.disable_function.function("ini_set").param("varname").value_r("open_basedir").drop()
+
+##Prevent various `include`-related vulnerabilities
+sp.disable_function.function("require_once").value_r("\.(inc|phtml|php)$").allow();
+sp.disable_function.function("include_once").value_r("\.(inc|phtml|php)$").allow();
+sp.disable_function.function("require").value_r("\.(inc|phtml|php)$").allow();
+sp.disable_function.function("include").value_r("\.(inc|phtml|php)$").allow();
+sp.disable_function.function("require_once").drop()
+sp.disable_function.function("include_once").drop()
+sp.disable_function.function("require").drop()
+sp.disable_function.function("include").drop()
+
+# Prevent `system`-related injections
+sp.disable_function.function("system").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
+sp.disable_function.function("shell_exec").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
+sp.disable_function.function("exec").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
+sp.disable_function.function("proc_open").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
+
+# Prevent runtime modification of interesting things
+sp.disable_function.function("ini_set").param("var_name").value("assert.active").drop();
+sp.disable_function.function("ini_set").param("var_name").value("zend.assertions").drop();
+sp.disable_function.function("ini_set").param("var_name").value("memory_limit").drop();
+sp.disable_function.function("ini_set").param("var_name").value("include_path").drop();
+sp.disable_function.function("ini_set").param("var_name").value("open_basedir").drop();
+
+# Detect some backdoors via environnement recon
+sp.disable_function.function("ini_get").param("var_name").value("allow_url_fopen").drop();
+sp.disable_function.function("ini_get").param("var_name").value("open_basedir").drop();
+sp.disable_function.function("ini_get").param("var_name").value_r("suhosin").drop();
+sp.disable_function.function("function_exists").param("function_name").value("eval").drop();
+sp.disable_function.function("function_exists").param("function_name").value("exec").drop();
+sp.disable_function.function("function_exists").param("function_name").value("system").drop();
+sp.disable_function.function("function_exists").param("function_name").value("shell_exec").drop();
+sp.disable_function.function("function_exists").param("function_name").value("proc_open").drop();
+sp.disable_function.function("function_exists").param("function_name").value("passthru").drop();
+sp.disable_function.function("is_callable").param("var").value("eval").drop();
+sp.disable_function.function("is_callable").param("var").value("exec").drop();
+sp.disable_function.function("is_callable").param("var").value("system").drop();
+sp.disable_function.function("is_callable").param("var").value("shell_exec").drop();
+sp.disable_function.function("is_callable").param("var").value("proc_open").drop();
+sp.disable_function.function("is_callable").param("var").value("passthru").drop();
+
+# Commenting sqli related stuff to improve performance.
+# TODO figure out why these functions can't be hooked at startup
+# Ghetto sqli hardening
+# sp.disable_function.function("mysql_query").param("query").value_r("/\\*").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r("--").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r("#").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r(";.*;").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r("benchmark").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r("sleep").drop();
+# sp.disable_function.function("mysql_query").param("query").value_r("information_schema").drop();
+
+# sp.disable_function.function("mysqli_query").param("query").value_r("/\\*").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r("--").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r("#").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r(";.*;").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r("benchmark").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r("sleep").drop();
+# sp.disable_function.function("mysqli_query").param("query").value_r("information_schema").drop();
+
+# sp.disable_function.function("PDO::query").param("query").value_r("/\\*").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r("--").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r("#").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r(";.*;").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r("benchmark\\s*\\(").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r("sleep\\s*\\(").drop();
+# sp.disable_function.function("PDO::query").param("query").value_r("information_schema").drop();
+
+# Ghetto sqli detection
+# sp.disable_function.function("mysql_query").ret("FALSE").drop();
+# sp.disable_function.function("mysqli_query").ret("FALSE").drop();
+# sp.disable_function.function("PDO::query").ret("FALSE").drop();
+
+# Ensure that certificates are properly verified
+sp.disable_function.function("curl_setopt").param("value").value("1").allow();
+sp.disable_function.function("curl_setopt").param("value").value("2").allow();
+# `81` is SSL_VERIFYHOST and `64` SSL_VERIFYPEER
+sp.disable_function.function("curl_setopt").param("option").value("64").drop().alias("Please don't turn CURLOPT_SSL_VERIFYCLIENT off.");
+sp.disable_function.function("curl_setopt").param("option").value("81").drop().alias("Please don't turn CURLOPT_SSL_VERIFYHOST off.");
+
+#File upload
+sp.disable_function.function("move_uploaded_file").param("destination").value_r("\\.ph").drop();
+sp.disable_function.function("move_uploaded_file").param("destination").value_r("\\.ht").drop();