From 4c1cdbe2af71c9a2ed01587c8e4137e766d0cf9a Mon Sep 17 00:00:00 2001
From: Jeremy Fleischman <jeremyfleischman@gmail.com>
Date: Tue, 24 Oct 2023 16:09:42 +0700
Subject: [PATCH] mcaptcha package and module with nixos tests
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

closes #17

Co-authored-by: Shahar "Dawn" Or <mightyiampresence@gmail.com>
Co-authored-by: Rohit <rohitsutradhar311@gmail.com>
Co-authored-by: Matúš Ferech <matus.ferech@gmail.com>
Co-authored-by: Alejandro Sanchez Medina <alejandrosanchzmedina@gmail.com>
Co-authored-by: Auguste Baum <auguste.apple@gmail.com>
---
 modules/all-modules.nix                       |    1 +
 modules/mcaptcha.nix                          |  276 ++
 pkgs/by-name/mcaptcha-cache/Cargo.lock        |  780 ++++
 pkgs/by-name/mcaptcha-cache/package.nix       |   37 +
 .../deduplicate-pow_sha256-in-lockfile.patch  |   93 +
 pkgs/by-name/mcaptcha/frontend-package.json   |   44 +
 pkgs/by-name/mcaptcha/mcaptcha-Cargo.lock     | 3852 +++++++++++++++++
 .../mcaptcha/mcaptcha-cache-bust-Cargo.lock   |  354 ++
 pkgs/by-name/mcaptcha/no-build-script.patch   |   12 +
 pkgs/by-name/mcaptcha/openapi-package.json    |   22 +
 pkgs/by-name/mcaptcha/package.nix             |  203 +
 ...r-setting-cookie-secret-with-env-var.patch |   19 +
 .../default.nix                               |   78 +
 tests/mcaptcha-create-locally/default.nix     |   39 +
 14 files changed, 5810 insertions(+)
 create mode 100644 modules/mcaptcha.nix
 create mode 100644 pkgs/by-name/mcaptcha-cache/Cargo.lock
 create mode 100644 pkgs/by-name/mcaptcha-cache/package.nix
 create mode 100644 pkgs/by-name/mcaptcha/deduplicate-pow_sha256-in-lockfile.patch
 create mode 100644 pkgs/by-name/mcaptcha/frontend-package.json
 create mode 100644 pkgs/by-name/mcaptcha/mcaptcha-Cargo.lock
 create mode 100644 pkgs/by-name/mcaptcha/mcaptcha-cache-bust-Cargo.lock
 create mode 100644 pkgs/by-name/mcaptcha/no-build-script.patch
 create mode 100644 pkgs/by-name/mcaptcha/openapi-package.json
 create mode 100644 pkgs/by-name/mcaptcha/package.nix
 create mode 100644 pkgs/by-name/mcaptcha/support-for-setting-cookie-secret-with-env-var.patch
 create mode 100644 tests/mcaptcha-bring-your-own-services/default.nix
 create mode 100644 tests/mcaptcha-create-locally/default.nix

diff --git a/modules/all-modules.nix b/modules/all-modules.nix
index faf10f4e..8f43e321 100644
--- a/modules/all-modules.nix
+++ b/modules/all-modules.nix
@@ -4,6 +4,7 @@
   #liberaforms = import ./liberaforms.nix;
   flarum = import ./flarum.nix;
   kbin = import ./kbin.nix;
+  mcaptcha = import ./mcaptcha.nix;
   pretalx = import ./pretalx.nix;
   unbootable = import ./unbootable.nix;
 }
diff --git a/modules/mcaptcha.nix b/modules/mcaptcha.nix
new file mode 100644
index 00000000..70157ddd
--- /dev/null
+++ b/modules/mcaptcha.nix
@@ -0,0 +1,276 @@
+{
+  config,
+  lib,
+  options,
+  pkgs,
+  ...
+}: let
+  inherit (lib) types;
+  cfg = config.services.mcaptcha;
+  opt = options.services.mcaptcha;
+  settingsFormat = pkgs.formats.toml {};
+  filteredSettings = lib.attrsets.filterAttrsRecursive (_path: value: value != null) cfg.settings;
+  configFile = settingsFormat.generate "mcaptcha.config.toml" filteredSettings;
+in {
+  options.services.mcaptcha.enable = lib.mkEnableOption "mCaptcha server";
+  options.services.mcaptcha.package = lib.mkPackageOption pkgs "mcaptcha" {};
+
+  options.services.mcaptcha.settings = lib.mkOption {
+    type = lib.types.submodule {
+      freeformType = settingsFormat.type;
+
+      options.database.name = lib.mkOption {
+        type = types.str;
+        description = "Applies both when {option}`${opt.database.createLocally}` is set and not.";
+        default = "mcaptcha";
+      };
+
+      options.database.username = lib.mkOption {
+        type = types.nullOr types.str;
+        description = "Ignored when {option}`${opt.database.createLocally}`.";
+        example = "mcaptcha";
+        default = null;
+      };
+
+      options.database.hostname = lib.mkOption {
+        type = types.nullOr types.str;
+        description = "Ignored when {option}`${opt.database.createLocally}`.";
+        example = "localhost";
+        default = null;
+      };
+
+      options.database.port = lib.mkOption {
+        type = types.nullOr types.port;
+        description = "Ignored when {option}`${opt.database.createLocally}`.";
+        example = 5432;
+        default = null;
+      };
+
+      options.server.port = lib.mkOption {
+        type = types.port;
+        description = "Web server port.";
+        default = 7000;
+      };
+
+      options.server.domain = lib.mkOption {
+        type = types.str;
+        description = "Web server host.";
+        default = "localhost";
+        example = "example.com";
+      };
+
+      options.server.ip = lib.mkOption {
+        type = types.str;
+        description = "Web server addresses to bind to.";
+        default = "127.0.0.1";
+        example = "0.0.0.0";
+      };
+    };
+
+    description = "Extra settings.";
+  };
+
+  options.services.mcaptcha.user = lib.mkOption {
+    type = types.str;
+    description = "User account to run under.";
+    default = "mcaptcha";
+  };
+
+  options.services.mcaptcha.group = lib.mkOption {
+    type = types.str;
+    description = "Group for the user mCaptcha runs under.";
+    default = "mcaptcha";
+  };
+
+  options.services.mcaptcha.database.createLocally = lib.mkOption {
+    type = types.bool;
+    description = "Whether to create and use a local database instance";
+    default = false;
+  };
+
+  options.services.mcaptcha.database.passwordFile = lib.mkOption {
+    type = types.nullOr types.path;
+    description = ''
+      Path to a file containing a database password.
+
+      Ignored when {option}`${opt.database.createLocally}`.
+    '';
+    default = null;
+    example = "/run/secrets/mcaptcha/database";
+  };
+
+  options.services.mcaptcha.server.cookieSecretFile = lib.mkOption {
+    type = types.path;
+    description = "Path to a file containing a cookie secret.";
+    example = "/run/secrets/mcaptcha/cookie-secret";
+  };
+
+  options.services.mcaptcha.captcha.saltFile = lib.mkOption {
+    type = types.path;
+    description = "Path to a file containing a salt.";
+    example = "/run/secrets/mcaptcha/salt";
+  };
+
+  options.services.mcaptcha.redis.createLocally = lib.mkOption {
+    type = types.bool;
+    description = "Whether to create a Redis instance locally.";
+    default = false;
+  };
+
+  options.services.mcaptcha.redis.host = lib.mkOption {
+    type = types.str;
+    description = "Ignored when {option}`${opt.redis.createLocally}`.";
+    example = "redis.example.com";
+  };
+
+  options.services.mcaptcha.redis.port = lib.mkOption {
+    type = types.port;
+    description = "Applies both when {option}`${opt.redis.createLocally}` is set and not.";
+    default = 6379;
+  };
+
+  options.services.mcaptcha.redis.user = lib.mkOption {
+    type = types.str;
+    description = "Ignored when {option}`${opt.redis.createLocally}`.";
+    default = "default";
+    example = "mcaptcha";
+  };
+
+  options.services.mcaptcha.redis.passwordFile = lib.mkOption {
+    type = types.path;
+    description = ''
+      Path to a file containing the Redis server password.
+
+      Ignored when {option}`${opt.redis.createLocally}`.";
+    '';
+    example = "/run/secrets/mcaptcha/redis-secret";
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = (!cfg.database.createLocally) -> (cfg.settings.database.username != null);
+        message = "If `${opt.database.createLocally}` is not specified, then `${opt.settings.database.username}` must be specified";
+      }
+      {
+        assertion = (!cfg.database.createLocally) -> (cfg.settings.database.port != null);
+        message = "If `${opt.database.createLocally}` is not specified, then `${opt.settings.database.port}` must be specified";
+      }
+      {
+        assertion = (!cfg.database.createLocally) -> (cfg.settings.database.hostname != null);
+        message = "If `${opt.database.createLocally}` is not specified, then `${opt.settings.database.hostname}` must be specified";
+      }
+    ];
+    services.mcaptcha.settings = {
+      # mCaptcha has no support for defaults. Every option must be specified.
+      # The module-provided defaults below are based on
+      # https://github.com/mCaptcha/mCaptcha/blob/f337ee0643d88723776e1de4e5588dfdb6c0c574/config/default.toml
+      debug = lib.mkDefault false;
+      source_code = lib.mkDefault "https://github.com/mCaptcha/mCaptcha";
+      commercial = lib.mkDefault false;
+      allow_demo = lib.mkDefault false;
+      allow_registration = lib.mkDefault true;
+
+      server = {
+        proxy_has_tls = lib.mkDefault false;
+      };
+
+      database = {
+        pool = lib.mkDefault 4;
+        database_type = lib.mkDefault "postgres";
+      };
+
+      captcha = {
+        gc = lib.mkDefault 30;
+        runners = lib.mkDefault 4;
+        queue_length = lib.mkDefault 2000;
+        enable_stats = lib.mkDefault true;
+
+        default_difficulty_strategy = {
+          avg_traffic_difficulty = lib.mkDefault 50000;
+          peak_sustainable_traffic_difficulty = lib.mkDefault 3000000;
+          broke_my_site_traffic_difficulty = lib.mkDefault 5000000;
+          duration = lib.mkDefault 30;
+        };
+      };
+
+      redis = {
+        pool = lib.mkDefault 4;
+      };
+    };
+
+    systemd.services.mcaptcha.description = "mCaptcha: a CAPTCHA system that gives attackers a run for their money";
+
+    systemd.services.mcaptcha.script = let
+      serverCookieSecret = "export MCAPTCHA_SERVER_COOKIE_SECRET=$(< ${cfg.server.cookieSecretFile})";
+      captchaSalt = "export MCAPTCHA_CAPTCHA_SALT=$(< ${cfg.captcha.saltFile})";
+      databaseLocalUrl = ''export DATABASE_URL="postgres:///${cfg.settings.database.name}?host=/run/postgresql"'';
+      databasePassword = "export MCAPTCHA_DATABASE_PASSWORD=$(< ${cfg.database.passwordFile})";
+      redisLocalUrl = ''export MCAPTCHA_REDIS_URL="redis://${cfg.redis.host}:${builtins.toString cfg.redis.port}"'';
+      redisRemoteUrl = let
+        urlencode = lib.getExe' pkgs.urlencode "urlencode";
+      in ''
+        redis_user=$(${urlencode} -e userinfo ${lib.escapeShellArg cfg.redis.user})
+        redis_pass=$(${urlencode} -e userinfo < ${cfg.redis.passwordFile})
+        export MCAPTCHA_REDIS_URL="redis://$redis_user:$redis_pass@${cfg.redis.host}:${builtins.toString cfg.redis.port}"
+      '';
+      exec = "exec ${lib.getExe cfg.package}";
+    in
+      lib.concatStringsSep "\n" [
+        serverCookieSecret
+        captchaSalt
+        (
+          if cfg.database.createLocally
+          then databaseLocalUrl
+          else databasePassword
+        )
+        (
+          if cfg.redis.createLocally
+          then redisLocalUrl
+          else redisRemoteUrl
+        )
+        exec
+      ];
+
+    systemd.services.mcaptcha.environment.MCAPTCHA_CONFIG = builtins.toString configFile;
+    systemd.services.mcaptcha.after = ["syslog.target"] ++ lib.optionals cfg.database.createLocally ["postgresql.service"];
+    systemd.services.mcaptcha.bindsTo = lib.optionals cfg.database.createLocally ["postgresql.service"];
+    systemd.services.mcaptcha.wants = ["network-online.target"];
+    systemd.services.mcaptcha.wantedBy = ["multi-user.target"];
+    # Settings modeled after https://github.com/mCaptcha/mCaptcha/blob/f337ee0643d88723776e1de4e5588dfdb6c0c574/docs/DEPLOYMENT.md#6-systemd-service-configuration
+    systemd.services.mcaptcha.serviceConfig.User = cfg.user;
+    systemd.services.mcaptcha.serviceConfig.Type = "simple";
+    systemd.services.mcaptcha.serviceConfig.Restart = "on-failure";
+    systemd.services.mcaptcha.serviceConfig.RestartSec = 1;
+    systemd.services.mcaptcha.serviceConfig.SuccessExitStatus = "3 4";
+    systemd.services.mcaptcha.serviceConfig.RestartForceExitStatus = "3 4";
+    systemd.services.mcaptcha.serviceConfig.SystemCallArchitectures = "native";
+    systemd.services.mcaptcha.serviceConfig.MemoryDenyWriteExecute = true;
+    systemd.services.mcaptcha.serviceConfig.NoNewPrivileges = true;
+    services.mcaptcha.redis.host = lib.mkIf cfg.redis.createLocally "127.0.0.1";
+
+    users.users."${cfg.user}" = {
+      isSystemUser = true;
+      group = cfg.group;
+    };
+
+    users.groups."${cfg.group}" = {};
+
+    services.postgresql = lib.mkIf cfg.database.createLocally {
+      enable = true;
+      ensureDatabases = [cfg.settings.database.name];
+      ensureUsers = [
+        {
+          name = cfg.user;
+          ensurePermissions = {"DATABASE ${cfg.settings.database.name}" = "ALL PRIVILEGES";};
+        }
+      ];
+    };
+
+    services.redis.servers.mcaptcha = lib.mkIf cfg.redis.createLocally {
+      enable = true;
+      port = cfg.redis.port;
+      extraParams = ["--loadmodule" "${pkgs.mcaptcha-cache}/lib/libcache.so"];
+    };
+  };
+}
diff --git a/pkgs/by-name/mcaptcha-cache/Cargo.lock b/pkgs/by-name/mcaptcha-cache/Cargo.lock
new file mode 100644
index 00000000..cc3bcdc1
--- /dev/null
+++ b/pkgs/by-name/mcaptcha-cache/Cargo.lock
@@ -0,0 +1,780 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9ecd88a8c8378ca913a680cd98f0f13ac67383d35993f86c90a70e3f137816b"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "backtrace"
+version = "0.3.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cab84319d616cfb654d03394f38ab7e6f0919e181b1b57e1fd15e7fb4077d9a7"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "bindgen"
+version = "0.59.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bd2a9a458e8f4304c52c43ebb0cfbd520289f8379a52e329a38afda99bf8eb8"
+dependencies = [
+ "bitflags",
+ "cexpr",
+ "clang-sys",
+ "clap",
+ "env_logger",
+ "lazy_static",
+ "lazycell",
+ "log",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote 1.0.20",
+ "regex",
+ "rustc-hash",
+ "shlex",
+ "which",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "cc"
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+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+
+[[package]]
+name = "cexpr"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
+[[package]]
+name = "clap"
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+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim 0.8.0",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
+[[package]]
+name = "convert_case"
+version = "0.4.0"
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+checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
+
+[[package]]
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+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
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+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
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+]
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+ "quote 1.0.20",
+ "rustc_version",
+ "syn 1.0.98",
+]
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+[[package]]
+name = "either"
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+
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+checksum = "e2b90e520ec62c1864c8c78d637acbfe8baf5f63240f2fb8165b8325c07812dd"
+dependencies = [
+ "num-traits 0.1.43",
+ "quote 0.3.15",
+ "syn 0.11.11",
+]
+
+[[package]]
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+ "bitflags",
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+ "enum-primitive-derive",
+ "libc",
+ "num-traits 0.2.15",
+ "regex",
+ "strum_macros",
+]
+
+[[package]]
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+ "quote 1.0.20",
+ "rustversion",
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+ "unicode-xid",
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+[[package]]
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+ "quote 1.0.20",
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+ "winapi-util",
+]
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+ "unicode-width",
+]
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+ "autocfg",
+ "pin-project-lite",
+]
+
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+
+[[package]]
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+
+[[package]]
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+
+[[package]]
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+checksum = "5c4fb54e6113b6a8772ee41c3404fb0301ac79604489467e0a9ce1f3e97c24ae"
+dependencies = [
+ "either",
+ "lazy_static",
+ "libc",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/pkgs/by-name/mcaptcha-cache/package.nix b/pkgs/by-name/mcaptcha-cache/package.nix
new file mode 100644
index 00000000..3b75bd5b
--- /dev/null
+++ b/pkgs/by-name/mcaptcha-cache/package.nix
@@ -0,0 +1,37 @@
+{
+  rustPlatform,
+  fetchFromGitHub,
+  lib,
+}: let
+  src = fetchFromGitHub {
+    owner = "mCaptcha";
+    repo = "cache";
+    rev = "67d6c701baa804849abc53a78422a6da01358487";
+    # NOTE: Avoiding this typo fix (which caused a bug in libmcaptcha)
+    # https://github.com/mCaptcha/cache/commit/f30bc54e6374cf5fad07af8f3d38bbe5fbbb4b20
+    # until this is merged https://github.com/mCaptcha/libmcaptcha/pull/12
+    sha256 = "sha256-whRLgYkoBoVQiZwrmwBwqgHzPqqXC6g3na3YrH4/xVo=";
+  };
+in
+  rustPlatform.buildRustPackage rec {
+    inherit src;
+    pname = "cache";
+    version = "unstable-2023-03-08";
+
+    cargoLock = {
+      lockFile = ./Cargo.lock;
+      outputHashes = {
+        "libmcaptcha-0.1.4" = "sha256-KwFT0Px5ZQGa26fjkiaT8lKc8ASVdfL/67E0hnaHl7I=";
+      };
+    };
+
+    nativeBuildInputs = [rustPlatform.bindgenHook];
+
+    checkPhase = ''
+      runHook preCheck
+
+      cargo test --all --all-features --no-fail-fast
+
+      runHook postCheck
+    '';
+  }
diff --git a/pkgs/by-name/mcaptcha/deduplicate-pow_sha256-in-lockfile.patch b/pkgs/by-name/mcaptcha/deduplicate-pow_sha256-in-lockfile.patch
new file mode 100644
index 00000000..7bcedf21
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/deduplicate-pow_sha256-in-lockfile.patch
@@ -0,0 +1,93 @@
+diff --git a/Cargo.lock b/Cargo.lock
+index 26cb8e4bd..317145f77 100644
+--- a/Cargo.lock
++++ b/Cargo.lock
+@@ -1676,7 +1676,7 @@ checksum = "f7012b1bbb0719e1097c47611d3898568c546d597c2e74d66f6087edd5233ff4"
+ [[package]]
+ name = "libmcaptcha"
+ version = "0.2.3"
+-source = "git+https://github.com/mCaptcha/libmcaptcha?tag=0.2.3#6bc0d11f8839d18c4d930cac0c0b86505ed1b2f6"
++source = "git+https://github.com/ngi-nix/libmcaptcha?branch=fix-pow_sha256-version#33eeff07f5281a693c75bd07d9bb75534ef48da3"
+ dependencies = [
+  "actix",
+  "crossbeam-channel",
+@@ -1684,7 +1684,7 @@ dependencies = [
+  "derive_more",
+  "log",
+  "num_cpus",
+- "pow_sha256 0.3.1 (git+https://github.com/mcaptcha/pow_sha256)",
++ "pow_sha256",
+  "pretty_env_logger",
+  "rand",
+  "redis",
+@@ -1809,7 +1809,7 @@ dependencies = [
+  "mime_guess",
+  "num_cpus",
+  "openssl",
+- "pow_sha256 0.3.1 (git+https://github.com/mcaptcha/pow_sha256?tag=0.3.1)",
++ "pow_sha256",
+  "pretty_env_logger",
+  "rand",
+  "rust-embed",
+@@ -2299,18 +2299,6 @@ dependencies = [
+  "sha2",
+ ]
+ 
+-[[package]]
+-name = "pow_sha256"
+-version = "0.3.1"
+-source = "git+https://github.com/mcaptcha/pow_sha256#148f1cb70d19114d1340661a77b2b679e95715f6"
+-dependencies = [
+- "bincode",
+- "derive_builder",
+- "num",
+- "serde 1.0.147",
+- "sha2",
+-]
+-
+ [[package]]
+ name = "ppv-lite86"
+ version = "0.2.17"
+diff --git a/Cargo.toml b/Cargo.toml
+index 25058093c..3e7268f6c 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -59,7 +59,7 @@ log = "0.4"
+ lazy_static = "1.4"
+ 
+ 
+-libmcaptcha = { version = "0.2.3", git = "https://github.com/mCaptcha/libmcaptcha", features = ["full"], tag ="0.2.3" }
++libmcaptcha = { version = "0.2.3", git = "https://github.com/ngi-nix/libmcaptcha", features = ["full"], branch ="fix-pow_sha256-version" }
+ #libmcaptcha = { branch = "master", git = "https://github.com/mCaptcha/libmcaptcha", features = ["full"] }
+ #libmcaptcha = { path = "../libmcaptcha", features = ["full"]}
+ 
+@@ -72,8 +72,8 @@ mime = "0.3.16"
+ num_cpus = "1.13.1"
+ 
+ lettre = { version = "0.10.0-rc.3", features = [
+-"builder", 
+-"tokio1", 
++"builder",
++"tokio1",
+ "tokio1-native-tls",
+ "smtp-transport"
+ ]}
+diff --git a/db/db-core/Cargo.toml b/db/db-core/Cargo.toml
+index 9b62a7eac..50253c841 100644
+--- a/db/db-core/Cargo.toml
++++ b/db/db-core/Cargo.toml
+@@ -8,12 +8,12 @@ documentation = "https://mcaptcha.org/docs/"
+ license = "AGPLv3 or later version"
+ authors = ["realaravinth <realaravinth@batsense.net>"]
+ 
+-[dependencies] 
++[dependencies]
+ async-trait = "0.1.51"
+ thiserror = "1.0.30"
+ serde = { version = "1", features = ["derive"]}
+ url = { version  = "2.2.2", features = ["serde"] }
+-libmcaptcha = {  version = "0.2.3", git = "https://github.com/mCaptcha/libmcaptcha", features = ["minimal"], default-features = false, tag = "0.2.3"}
++libmcaptcha = { version = "0.2.3", git = "https://github.com/ngi-nix/libmcaptcha", features = ["minimal"], branch ="fix-pow_sha256-version" }
+ #libmcaptcha = { branch = "master", git = "https://github.com/mCaptcha/libmcaptcha", features = ["full"] }
+ 
+ [features]
diff --git a/pkgs/by-name/mcaptcha/frontend-package.json b/pkgs/by-name/mcaptcha/frontend-package.json
new file mode 100644
index 00000000..bb0d0fdd
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/frontend-package.json
@@ -0,0 +1,44 @@
+{
+  "name": "vanilla",
+  "main": "index.js",
+  "version": "1.0.0",
+  "license": "AGPL-3.0",
+  "scripts": {
+    "build": "webpack --mode production",
+    "lint": "yarn run eslint templates",
+    "start": "webpack-dev-server --mode development --progress --color",
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.5.2",
+    "@types/jsdom": "^21.1.1",
+    "@types/node": "^20.3.3",
+    "@types/sinon": "^10.0.15",
+    "@typescript-eslint/eslint-plugin": "^5.60.1",
+    "@typescript-eslint/parser": "^5.60.1",
+    "@wasm-tool/wasm-pack-plugin": "^1.7.0",
+    "css-loader": "^6.8.1",
+    "css-minimizer-webpack-plugin": "^5.0.1",
+    "eslint": "^8.44.0",
+    "jest": "^29.5.0",
+    "jest-environment-jsdom": "^29.5.0",
+    "jest-fetch-mock": "^3.0.3",
+    "jsdom": "^22.1.0",
+    "mini-css-extract-plugin": "^2.7.6",
+    "sass": "^1.63.6",
+    "sass-loader": "^13.3.2",
+    "sinon": "^15.2.0",
+    "ts-jest": "^29.1.1",
+    "ts-loader": "^9.4.4",
+    "ts-node": "^10.9.1",
+    "typescript": "^5.1.6",
+    "webpack": "^5.88.1",
+    "webpack-cli": "^5.1.4",
+    "webpack-dev-server": "^4.15.1"
+  },
+  "dependencies": {
+    "@mcaptcha/pow_sha256-polyfill": "^0.1.0-alpha-1",
+    "@mcaptcha/pow-wasm": "^0.1.0-alpha-1",
+    "@mcaptcha/vanilla-glue": "^0.1.0-alpha-3"
+  }
+}
diff --git a/pkgs/by-name/mcaptcha/mcaptcha-Cargo.lock b/pkgs/by-name/mcaptcha/mcaptcha-Cargo.lock
new file mode 100644
index 00000000..317145f7
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/mcaptcha-Cargo.lock
@@ -0,0 +1,3852 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "actix"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f728064aca1c318585bf4bb04ffcfac9e75e508ab4e8b1bd9ba5dfe04e2cbed5"
+dependencies = [
+ "actix-rt",
+ "actix_derive",
+ "bitflags",
+ "bytes",
+ "crossbeam-channel",
+ "futures-core",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+ "log",
+ "once_cell",
+ "parking_lot 0.12.1",
+ "pin-project-lite",
+ "smallvec",
+ "tokio",
+ "tokio-util",
+]
+
+[[package]]
+name = "actix-auth-middleware"
+version = "0.2.0"
+source = "git+https://github.com/realaravinth/actix-auth-middleware#8a3beb70d70acbe0cce2c7257867d6198ca79eff"
+dependencies = [
+ "actix-http",
+ "actix-identity",
+ "actix-service",
+ "actix-web",
+ "futures",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "617a8268e3537fe1d8c9ead925fca49ef6400927ee7bc26750e90ecee14ce4b8"
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+ "bitflags",
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "memchr",
+ "pin-project-lite",
+ "tokio",
+ "tokio-util",
+ "tracing",
+]
+
+[[package]]
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+checksum = "b340e9cfa5b08690aae90fb61beb44e9b06f44fe3d0f93781aaa58cfba86245e"
+dependencies = [
+ "actix-utils",
+ "actix-web",
+ "derive_more",
+ "futures-util",
+ "log",
+ "once_cell",
+ "smallvec",
+]
+
+[[package]]
+name = "actix-http"
+version = "3.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "actix-rt",
+ "actix-service",
+ "actix-utils",
+ "ahash 0.8.3",
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+ "bitflags",
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+ "bytes",
+ "bytestring",
+ "derive_more",
+ "encoding_rs",
+ "flate2",
+ "futures-core",
+ "h2",
+ "http",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "language-tags",
+ "local-channel",
+ "mime",
+ "percent-encoding",
+ "pin-project-lite",
+ "rand",
+ "sha1 0.10.5",
+ "smallvec",
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+ "tokio-util",
+ "tracing",
+ "zstd",
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+
+[[package]]
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+ "actix-web",
+ "futures-util",
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+[[package]]
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+[[package]]
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+[[package]]
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+checksum = "15265b6b8e2347670eb363c47fc8c75208b4a4994b27192f345fcbe707804f3e"
+dependencies = [
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+ "tokio",
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+
+[[package]]
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+ "actix-utils",
+ "futures-core",
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+ "mio",
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+ "tokio",
+ "tracing",
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+
+[[package]]
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+ "actix-utils",
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+ "cookie",
+ "derive_more",
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+ "futures-core",
+ "futures-util",
+ "http",
+ "itoa",
+ "language-tags",
+ "log",
+ "mime",
+ "once_cell",
+ "pin-project-lite",
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+ "serde 1.0.147",
+ "serde_json",
+ "serde_urlencoded",
+ "smallvec",
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+ "time 0.3.22",
+ "url",
+]
+
+[[package]]
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+source = "git+https://github.com/realaravinth/actix-web#8a399b6e7ea6ffdf241d07a9e907b1afff7e0fe6"
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+checksum = "dcf81ac59edc17cc8697ff311e8f5ef2d99fcbd9817b34cec66f90b6c3dfd987"
+
+[[package]]
+name = "unicase"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "957e51f3646910546462e67d5f7599b9e4fb8acdd304b087a6494730f9eebf04"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "walkdir"
+version = "2.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
+dependencies = [
+ "same-file",
+ "winapi",
+ "winapi-util",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/pkgs/by-name/mcaptcha/no-build-script.patch b/pkgs/by-name/mcaptcha/no-build-script.patch
new file mode 100644
index 00000000..9d969edd
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/no-build-script.patch
@@ -0,0 +1,12 @@
+diff --git a/Cargo.toml b/Cargo.toml
+index 25058093..a7d13eb7 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -9,7 +9,6 @@ license = "AGPLv3 or later version"
+ authors = ["realaravinth <realaravinth@batsense.net>"]
+ edition = "2021"
+ default-run = "mcaptcha"
+-build = "build.rs"
+ 
+ # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+ 
diff --git a/pkgs/by-name/mcaptcha/openapi-package.json b/pkgs/by-name/mcaptcha/openapi-package.json
new file mode 100644
index 00000000..99c31a33
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/openapi-package.json
@@ -0,0 +1,22 @@
+{
+  "name": "mcaptcha",
+  "version": "0.1.0",
+  "description": "mCaptcha CAPTCHA service's API",
+  "main": "index.js",
+  "scripts": {
+    "build": "redocly bundle openapi.yaml --output dist/openapi.yaml",
+    "clean": "rm -r dist"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mCaptcha/mCaptcha.git"
+  },
+  "license": "AGPL-3.0-or-later",
+  "bugs": {
+    "url": "https://github.com/mCaptcha/mCaptcha/issues"
+  },
+  "homepage": "https://github.com/mCaptcha/mCaptcha#readme",
+  "devDependencies": {
+    "@redocly/cli": "^1.0.0-beta.129"
+  }
+}
diff --git a/pkgs/by-name/mcaptcha/package.nix b/pkgs/by-name/mcaptcha/package.nix
new file mode 100644
index 00000000..c3bfff20
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/package.nix
@@ -0,0 +1,203 @@
+{
+  mkYarnPackage,
+  fetchYarnDeps,
+  fetchFromGitHub,
+  rustPlatform,
+  lib,
+  openssl,
+  pkg-config,
+  perl,
+  nixosTests,
+}: let
+  rootSrc = fetchFromGitHub {
+    owner = "mCaptcha";
+    repo = "mCaptcha";
+    rev = "f337ee0643d88723776e1de4e5588dfdb6c0c574";
+    sha256 = "sha256-UP7V2TfbW+KJpNAQLxQIcRsT9ZWYGVkS13XxMbHEH2I=";
+  };
+
+  releaseDate = "2023-07-04";
+
+  frontend = let
+    src = rootSrc;
+  in
+    mkYarnPackage {
+      pname = "mcaptcha-frontend";
+      version = "unstable-${releaseDate}";
+      inherit src;
+
+      packageJSON = ./frontend-package.json;
+      offlineCache = fetchYarnDeps {
+        yarnLock = "${src}/yarn.lock";
+        sha256 = "sha256-GyWjQdFJ+hEuR4PebhYzFwiuyMyamRY5GPaJ7rK9Rsc=";
+      };
+
+      buildPhase = ''
+        runHook preBuild
+
+        export HOME=$(mktemp -d)
+        yarn --offline build
+
+        runHook postBuild
+      '';
+
+      doCheck = true;
+      checkPhase = ''
+        runHook preCheck
+        CI=true yarn test
+        runHook postCheck
+      '';
+
+      # Copied from `make frontend` in the mCaptcha Makefile:
+      # https://github.com/mCaptcha/mCaptcha/blob/f337ee0643d88723776e1de4e5588dfdb6c0c574/Makefile#L130-L147
+      installPhase = ''
+        runHook preInstall
+
+        yarn run sass -s \
+          compressed templates/main.scss  \
+          ./static/cache/bundle/css/main.css
+        yarn run sass -s \
+          compressed templates/mobile.scss  \
+          ./static/cache/bundle/css/mobile.css
+        yarn run sass -s \
+          compressed templates/widget/main.scss  \
+          ./static/cache/bundle/css/widget.css
+
+        patchShebangs deps/vanilla/scripts
+        deps/vanilla/scripts/librejs.sh
+        deps/vanilla/scripts/cachebust.sh
+
+        mv deps/vanilla/static/cache/bundle $out
+
+        runHook postInstall
+      '';
+
+      # Note that "true" disables the dist phase, as this is all handled in
+      # installPhase above.
+      distPhase = "true";
+    };
+
+  openapi = let
+    src = rootSrc + "/docs/openapi";
+  in
+    mkYarnPackage {
+      pname = "mcaptcha-openapi";
+      version = "unstable-${releaseDate}";
+      inherit src;
+
+      packageJSON = ./openapi-package.json;
+      offlineCache = fetchYarnDeps {
+        yarnLock = "${src}/yarn.lock";
+        sha256 = "sha256-mdd5AwO4WO/RoR/ycR+miJvRXgu1K6WXvMZtyyV/0Tc=";
+      };
+
+      buildPhase = ''
+        runHook preBuild
+
+        export HOME=$(mktemp -d)
+        yarn --offline build
+
+        runHook postBuild
+      '';
+
+      installPhase = ''
+        runHook preInstall
+        mv deps/mcaptcha/dist $out
+        runHook postInstall
+      '';
+
+      # Note that "true" disables the dist phase, as this is all handled in
+      # installPhase above.
+      distPhase = "true";
+    };
+
+  cache-bust = let
+    src = rootSrc + "/utils/cache-bust";
+  in
+    rustPlatform.buildRustPackage {
+      inherit src;
+      pname = "cache-bust";
+      version = "unstable-${releaseDate}";
+
+      cargoLock = {
+        lockFile = ./mcaptcha-cache-bust-Cargo.lock;
+        outputHashes = {
+          "cache-buster-0.2.0" = "sha256-FT+GV2c+jZyVyC2pEtDm52Aurbf6tOZeBqzHq3NZptw=";
+        };
+      };
+    };
+
+  mcaptcha = let
+    src = rootSrc;
+  in
+    rustPlatform.buildRustPackage {
+      inherit src;
+      pname = "mcaptcha";
+      version = "unstable-${releaseDate}";
+
+      cargoLock = {
+        # Note: this isn't the lockfile from upstream, it has been patched, see
+        # ./deduplicate-pow_sha256-in-lockfile.patch for details.
+        lockFile = ./mcaptcha-Cargo.lock;
+        outputHashes = {
+          "actix-auth-middleware-0.2.0" = "sha256-sLd2Fsa02bXE+CTzTcByTF2PAnzn5YEYGekCmw+AG4E=";
+          "actix-web-codegen-4.0.0" = "sha256-2MKgeCa9C5WL0TtvQSTvz2YMBBgzn7tnkFL7c7KJFSs=";
+          "argon2-creds-0.2.2" = "sha256-A5xkcVvi+xfdQ0vBdqJgtlIbiNmOz6weSB3ho6kAz+A=";
+          "cache-buster-0.2.0" = "sha256-FT+GV2c+jZyVyC2pEtDm52Aurbf6tOZeBqzHq3NZptw=";
+          "libmcaptcha-0.2.3" = "sha256-oedAXrasZ3YAj6PiscdasAQ0RlG9YcFAuFRtxicmkhY=";
+          "pow_sha256-0.3.1" = "sha256-gprbSYL0tjKQlQe/lJwFZM0avSQT92nAwUnr61t0X0g=";
+        };
+      };
+
+      patches = [
+        # https://github.com/mCaptcha/mCaptcha/issues/105
+        ./support-for-setting-cookie-secret-with-env-var.patch
+        # build.rs does some impure stuff with git to inject a commit hash and
+        # a compilation date. That isn't nix-compatible, so we remove it, and
+        # simulate its effects (see GIT_HASH and COMPILED_DATE below).
+        ./no-build-script.patch
+        # This is blocked on https://github.com/mCaptcha/libmcaptcha/pull/13.
+        # Once that PR is merged, we can re-lock dependencies in mCaptcha, and
+        # the duplicate pow_sha256 will go away.
+        ./deduplicate-pow_sha256-in-lockfile.patch
+      ];
+
+      # Remove the build.rs mentioned in no-build-script.patch above. (This is
+      # just less likely to run into future conflicts vs if we put it in the
+      # patch file).
+      postPatch = ''
+        rm build.rs
+      '';
+
+      # Setting these variables to simulate the behavior of the (impure)
+      # build.rs script we've removed.
+      GIT_HASH = src.rev;
+      COMPILED_DATE = releaseDate;
+
+      preBuild = ''
+        ln -s ${openapi} docs/openapi/dist
+        ln -s ${frontend} static/cache/bundle
+        (cd utils/cache-bust && ${cache-bust}/bin/cache-bust)
+      '';
+
+      # Most of the tests are database integration tests
+      doCheck = false;
+
+      # Get openssl-sys to use pkg-config
+      OPENSSL_NO_VENDOR = 1;
+
+      nativeBuildInputs = [pkg-config perl];
+
+      buildInputs = [openssl];
+
+      meta = {
+        url = "https://mcaptcha.org/";
+        description = "mCaptcha is proof-of-work based captcha system that is privacy focused and fully automated.";
+        license = lib.licenses.agpl3Plus;
+        mainProgram = "mcaptcha";
+      };
+
+      passthru.tests = {inherit (nixosTests) mcaptcha-create-locally mcaptcha-bring-your-own-services;};
+    };
+in
+  mcaptcha
diff --git a/pkgs/by-name/mcaptcha/support-for-setting-cookie-secret-with-env-var.patch b/pkgs/by-name/mcaptcha/support-for-setting-cookie-secret-with-env-var.patch
new file mode 100644
index 00000000..2addcb94
--- /dev/null
+++ b/pkgs/by-name/mcaptcha/support-for-setting-cookie-secret-with-env-var.patch
@@ -0,0 +1,19 @@
+diff --git a/src/settings.rs b/src/settings.rs
+index e64b8a67..a2ab0e0f 100644
+--- a/src/settings.rs
++++ b/src/settings.rs
+@@ -164,6 +164,14 @@ impl Settings {
+
+         s.merge(Environment::with_prefix("MCAPTCHA").separator("_"))?;
+
++        // Incomplete workaround for https://github.com/mCaptcha/mCaptcha/issues/105. There are
++        // other settings that still don't work, but this is the only one we need in order to securely
++        // package mCaptcha on NixOS.
++        if let Ok(val) = env::var("MCAPTCHA_SERVER_COOKIE_SECRET") {
++            s.set("server.cookie_secret", val).unwrap();
++            log::info!("Overriding [server].cookie_secret with environment variable");
++        }
++
+         check_url(&s);
+
+         if let Ok(val) = env::var("PORT") {
diff --git a/tests/mcaptcha-bring-your-own-services/default.nix b/tests/mcaptcha-bring-your-own-services/default.nix
new file mode 100644
index 00000000..cc49094b
--- /dev/null
+++ b/tests/mcaptcha-bring-your-own-services/default.nix
@@ -0,0 +1,78 @@
+{modules, ...}: let
+  port = 7000;
+  urlRoot = "http://localhost:${builtins.toString port}";
+  redisPassword = "(*&(*):ps@r}";
+in {
+  name = "test of mcaptcha with database and other services running on a different node";
+
+  nodes.mcaptcha = {
+    pkgs,
+    config,
+    ...
+  }: {
+    imports = [
+      modules.default
+      modules.mcaptcha
+    ];
+
+    services.mcaptcha.enable = true;
+    services.mcaptcha.settings.server.port = port;
+    services.mcaptcha.settings.server.domain = "localhost";
+    services.mcaptcha.server.cookieSecretFile = pkgs.writeText "cookie-secret" "mcaptcha-cookie-secret-dm0tdGVzdC1ydW4tbWNhcHRjaGEtdGVzdHM";
+    services.mcaptcha.captcha.saltFile = pkgs.writeText "salt" "asdl;kjfhjawehfpa;osdkjasdvjaksndfpoanjdfainsdfaijdsfajlkjdsaf;ajsdfweroire";
+
+    services.mcaptcha.settings.database.name = "my_mcaptcha";
+    services.mcaptcha.settings.database.username = "role_mcaptcha";
+    services.mcaptcha.settings.database.hostname = "my_own_services";
+    services.mcaptcha.settings.database.port = 5432;
+    services.mcaptcha.database.passwordFile = pkgs.writeText "db-password" "mcaptcha-db-secret";
+
+    services.mcaptcha.redis.passwordFile = pkgs.writeText "redis-secret" redisPassword;
+    services.mcaptcha.redis.host = "my_own_services";
+  };
+
+  nodes.my_own_services = {pkgs, ...}: {
+    imports = [
+      modules.default
+    ];
+    networking.firewall.enable = false;
+    services.postgresql.enable = true;
+    services.postgresql.enableTCPIP = true;
+    services.postgresql.initialScript = pkgs.writeText "postgresql-init-script" ''
+      CREATE ROLE role_mcaptcha WITH LOGIN PASSWORD 'mcaptcha-db-secret';
+      CREATE DATABASE my_mcaptcha;
+      GRANT ALL PRIVILEGES ON DATABASE my_mcaptcha TO role_mcaptcha;
+    '';
+    services.postgresql.authentication = ''
+      #type  database  DBuser         auth-method
+      host   all       all 0.0.0.0/0  md5
+    '';
+    services.redis.servers.mcaptcha.enable = true;
+    services.redis.servers.mcaptcha.port = 6379;
+    services.redis.servers.mcaptcha.bind = null;
+    services.redis.servers.mcaptcha.extraParams = [
+      "--loadmodule"
+      "${pkgs.mcaptcha-cache}/lib/libcache.so"
+    ];
+    services.redis.servers.mcaptcha.requirePass = redisPassword;
+  };
+
+  testScript = {nodes, ...}: ''
+    import json
+
+    my_own_services.start()
+    my_own_services.wait_for_unit("redis-mcaptcha.service")
+    my_own_services.wait_for_unit("postgresql.service")
+
+    mcaptcha.start()
+
+    mcaptcha.wait_for_unit("mcaptcha.service")
+    mcaptcha.wait_until_succeeds("curl --fail --connect-timeout 2 ${urlRoot}", timeout=60)
+
+    mcaptcha.succeed("curl --fail --connect-timeout 10 ${urlRoot}/widget")
+
+    json_str = mcaptcha.succeed("curl --fail --connect-timeout 10 ${urlRoot}/api/v1/meta/health")
+    health_data = json.loads(json_str)
+    assert health_data == {'db': True, 'redis': True}
+  '';
+}
diff --git a/tests/mcaptcha-create-locally/default.nix b/tests/mcaptcha-create-locally/default.nix
new file mode 100644
index 00000000..29df280b
--- /dev/null
+++ b/tests/mcaptcha-create-locally/default.nix
@@ -0,0 +1,39 @@
+{modules, ...}: let
+  port = 7000;
+  urlRoot = "http://localhost:${builtins.toString port}";
+in {
+  name = "test of mcaptcha with database and other services all running on the same node";
+
+  nodes.mcaptcha = {pkgs, ...}: {
+    imports = [
+      modules.default
+      modules.mcaptcha
+    ];
+
+    services.mcaptcha.enable = true;
+    services.mcaptcha.settings.server.port = port;
+    services.mcaptcha.server.cookieSecretFile = pkgs.writeText "cookie-secret" "mcaptcha-cookie-secret-dm0tdGVzdC1ydW4tbWNhcHRjaGEtdGVzdHM";
+    services.mcaptcha.captcha.saltFile = pkgs.writeText "salt" "asdl;kjfhjawehfpa;osdkjasdvjaksndfpoanjdfainsdfaijdsfajlkjdsaf;ajsdfweroire";
+    services.mcaptcha.database.createLocally = true;
+    services.mcaptcha.redis.createLocally = true;
+  };
+
+  interactive.nodes.mcaptcha = {
+    networking.firewall.enable = false;
+    services.mcaptcha.settings.server.ip = "0.0.0.0";
+  };
+
+  testScript = {nodes, ...}: ''
+    import json
+    mcaptcha.start()
+
+    mcaptcha.wait_for_unit("mcaptcha.service")
+    mcaptcha.wait_until_succeeds("curl --fail --connect-timeout 2 ${urlRoot}", timeout=60)
+
+    mcaptcha.succeed("curl --fail --connect-timeout 10 ${urlRoot}/widget")
+
+    json_str = mcaptcha.succeed("curl --fail --connect-timeout 10 ${urlRoot}/api/v1/meta/health")
+    health_data = json.loads(json_str)
+    assert health_data == {'db': True, 'redis': True}
+  '';
+}