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139 lines
8.1 KiB
Plaintext
139 lines
8.1 KiB
Plaintext
# This is based on default configuration file for Snuffleupagus (https://snuffleupagus.rtfd.io),
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# for php8.
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# It contains "reasonable" defaults that won't break your websites,
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# and a lot of commented directives that you can enable if you want to
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# have a better protection.
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# Harden the PRNG
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sp.harden_random.enable();
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# Disabled XXE
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sp.xxe_protection.enable();
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# Global configuration variables
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sp.global.secret_key("{{ SNUFFLEUPAGUS_KEY }}");
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# Globally activate strict mode
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# https://www.php.net/manual/en/language.types.declarations.php#language.types.declarations.strict
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sp.global_strict.enable();
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# Prevent unserialize-related exploits
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# sp.unserialize_hmac.enable();
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# Only allow execution of read-only files. This is a low-hanging fruit that you should enable.
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sp.readonly_exec.enable();
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# PHP has a lot of wrappers, most of them aren't usually useful, you should
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# only enable the ones you're using.
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sp.wrappers_whitelist.list("file,php,phar,mailsosubstreams,mailsoliteral,mailsotempfile,mailsobinary");
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# Prevent sloppy comparisons.
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sp.sloppy_comparison.enable();
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# Use SameSite on session cookie
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# https://snuffleupagus.readthedocs.io/features.html#protection-against-cross-site-request-forgery
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sp.cookie.name("PHPSESSID").samesite("lax");
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# Harden the `chmod` function (0777 (oct = 511, 0666 = 438)
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sp.disable_function.function("chmod").param("permissions").value("438").drop();
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sp.disable_function.function("chmod").param("permissions").value("511").drop();
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# Prevent various `mail`-related vulnerabilities
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sp.disable_function.function("mail").param("additional_parameters").value_r("\\-").drop();
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# Since it's now burned, me might as well mitigate it publicly
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sp.disable_function.function("putenv").param("assignment").value_r("LD_").drop()
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sp.disable_function.function("putenv").param("assignment").value("PATH").drop()
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# This one was burned in Nov 2019 - https://gist.github.com/LoadLow/90b60bd5535d6c3927bb24d5f9955b80
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sp.disable_function.function("putenv").param("assignment").value_r("GCONV_").drop()
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# Since people are stupid enough to use `extract` on things like $_GET or $_POST, we might as well mitigate this vector
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sp.disable_function.function("extract").param("array").value_r("^_").drop()
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sp.disable_function.function("extract").param("flags").value("0").drop()
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# This is also burned:
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# ini_set('open_basedir','..');chdir('..');…;chdir('..');ini_set('open_basedir','/');echo(file_get_contents('/etc/passwd'));
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# Since we have no way of matching on two parameters at the same time, we're
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# blocking calls to open_basedir altogether: nobody is using it via ini_set anyway.
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# Moreover, there are non-public bypasses that are also using this vector ;)
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sp.disable_function.function("ini_set").param("option").value_r("open_basedir").drop()
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# Prevent various `include`-related vulnerabilities
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sp.disable_function.function("require_once").value_r("\.(inc|phtml|php)$").allow();
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sp.disable_function.function("include_once").value_r("\.(inc|phtml|php)$").allow();
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sp.disable_function.function("require").value_r("\.(inc|phtml|php)$").allow();
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sp.disable_function.function("include").value_r("\.(inc|phtml|php)$").allow();
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sp.disable_function.function("require_once").drop()
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sp.disable_function.function("include_once").drop()
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sp.disable_function.function("require").drop()
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sp.disable_function.function("include").drop()
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# Prevent `system`-related injections
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sp.disable_function.function("system").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
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sp.disable_function.function("exec_shell").filename_r("/var/www/snappymail/snappymail/v/[0-9]+\.[0-9]+\.[0-9]+/app/libraries/snappymail/gpg/base.php").allow();
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sp.disable_function.function("shell_exec").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
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sp.disable_function.function("exec").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
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# This is **very** broad but doing better is non-straightforward
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sp.disable_function.function("proc_open").param("command").value_r("^(/usr/bin/)?gpg ").allow();
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sp.disable_function.function("proc_open").param("command").value_r("[$|;&`\\n\\(\\)\\\\]").drop();
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# Prevent runtime modification of interesting things
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sp.disable_function.function("ini_set").param("option").value("assert.active").drop();
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sp.disable_function.function("ini_set").param("option").value("zend.assertions").drop();
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sp.disable_function.function("ini_set").param("option").value("memory_limit").drop();
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sp.disable_function.function("ini_set").param("option").value("include_path").drop();
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sp.disable_function.function("ini_set").param("option").value("open_basedir").drop();
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# Detect some backdoors via environment recon
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sp.disable_function.function("ini_get").filename_r("^/var/www/snappymail/snappymail/v/[0-9]+\.[0-9]+\.[0-9]+/app/libraries/RainLoop/Utils\.php$").param("option").value("open_basedir").allow();
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sp.disable_function.function("ini_get").filename("/var/www/roundcube/vendor/guzzlehttp/guzzle/src/Utils.php").param("option").value("allow_url_fopen").allow();
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sp.disable_function.function("ini_get").filename("/var/www/roundcube/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php").param("option").value_r("suhosin").allow();
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sp.disable_function.function("ini_get").param("option").value("allow_url_fopen").drop();
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sp.disable_function.function("ini_get").param("option").value("open_basedir").drop();
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sp.disable_function.function("ini_get").param("option").value_r("suhosin").drop();
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sp.disable_function.function("function_exists").filename_r("/var/www/snappymail/snappymail/v/[0-9]+\.[0-9]+\.[0-9]+/app/libraries/snappymail/gpg/base.php").allow();
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sp.disable_function.function("function_exists").param("function").value("eval").drop();
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sp.disable_function.function("function_exists").param("function").value("exec").drop();
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sp.disable_function.function("function_exists").param("function").value("system").drop();
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sp.disable_function.function("function_exists").param("function").value("shell_exec").drop();
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sp.disable_function.function("function_exists").param("function").value("proc_open").drop();
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sp.disable_function.function("function_exists").param("function").value("passthru").drop();
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sp.disable_function.function("is_callable").filename_r("/var/www/snappymail/snappymail/v/[0-9]+\.[0-9]+\.[0-9]+/app/libraries/snappymail/gpg/base.php").allow();
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sp.disable_function.function("is_callable").param("value").value("eval").drop();
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sp.disable_function.function("is_callable").param("value").value("exec").drop();
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sp.disable_function.function("is_callable").param("value").value("system").drop();
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sp.disable_function.function("is_callable").param("value").value("shell_exec").drop();
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sp.disable_function.function("is_callable").param("value").value("proc_open").drop();
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sp.disable_function.function("is_callable").param("value").value("passthru").drop();
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# Ghetto error-based sqli detection
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#sp.disable_function.function("mysql_query").ret("FALSE").drop();
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#sp.disable_function.function("mysqli_query").ret("FALSE").drop();
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#sp.disable_function.function("PDO::query").ret("FALSE").drop();
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# Ensure that certificates are properly verified
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sp.disable_function.function("curl_setopt").param("value").value("1").allow();
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sp.disable_function.function("curl_setopt").param("value").value("2").allow();
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# `81` is SSL_VERIFYHOST and `64` SSL_VERIFYPEER
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sp.disable_function.function("curl_setopt").param("option").value("64").drop().alias("Please don't turn CURLOPT_SSL_VERIFYCLIENT off.");
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sp.disable_function.function("curl_setopt").param("option").value("81").drop().alias("Please don't turn CURLOPT_SSL_VERIFYHOST off.");
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# File upload
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sp.disable_function.function("move_uploaded_file").param("to").value_r("\\.ph").drop();
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sp.disable_function.function("move_uploaded_file").param("to").value_r("\\.ht").drop();
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# Logging lockdown
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sp.disable_function.function("ini_set").param("option").value_r("error_log").drop()
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sp.disable_function.function("ini_set").param("option").value_r("display_errors").drop()
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sp.auto_cookie_secure.enable();
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# TODO: consider encrypting the cookies?
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# TODO: ensure this is up to date
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sp.cookie.name("roundcube_sessauth").samesite("strict");
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sp.cookie.name("roundcube_sessid").samesite("strict");
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sp.ini_protection.policy_silent_fail();
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# roundcube uses unserialize() everywhere.
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sp.unserialize_noclass.enable();
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