feat(server): Enable overriding --requirepass form env var (#792)

Signed-off-by: ashotland <ari@dragonflydb.io>

src/server/main_service.cc

@@ -43,8 +43,6 @@ using namespace std;
 ABSL_FLAG(uint32_t, port, 6379, "Redis port");
 ABSL_FLAG(uint32_t, memcache_port, 0, "Memcached port");
 
-ABSL_DECLARE_FLAG(string, requirepass);
-
 namespace dfly {
 
 #if __GLIBC__ == 2 && __GLIBC_MINOR__ < 30
@@ -813,7 +811,7 @@ void Service::DispatchMC(const MemcacheParser::Command& cmd, std::string_view va
 facade::ConnectionContext* Service::CreateContext(util::FiberSocketBase* peer,
                                                   facade::Connection* owner) {
   ConnectionContext* res = new ConnectionContext{peer, owner};
-  res->req_auth = IsPassProtected();
+  res->req_auth = !GetPassword().empty();
 
   // a bit of a hack. I set up breaker callback here for the owner.
   // Should work though it's confusing to have it here.
@@ -853,10 +851,6 @@ bool Service::IsShardSetLocked() const {
   return res.load() != 0;
 }
 
-bool Service::IsPassProtected() const {
-  return !GetFlag(FLAGS_requirepass).empty();
-}
-
 absl::flat_hash_map<std::string, unsigned> Service::UknownCmdMap() const {
   lock_guard lk(mu_);
   return unknown_cmds_;

src/server/main_service.h

@@ -59,8 +59,6 @@ class Service : public facade::ServiceInterface {
     return pp_;
   }
 
-  bool IsPassProtected() const;
-
   absl::flat_hash_map<std::string, unsigned> UknownCmdMap() const;
 
   const CommandId* FindCmd(std::string_view cmd) const {

src/server/server_family.cc

@@ -51,7 +51,9 @@ using namespace std;
 
 ABSL_FLAG(string, dir, "", "working directory");
 ABSL_FLAG(string, dbfilename, "dump", "the filename to save/load the DB");
-ABSL_FLAG(string, requirepass, "", "password for AUTH authentication");
+ABSL_FLAG(string, requirepass, "",
+          "password for AUTH authentication. "
+          "If empty can also be set with DFLY_PASSWORD environment variable.");
 ABSL_FLAG(string, save_schedule, "",
           "glob spec for the UTC time to save a snapshot which matches HH:MM 24h time");
 
@@ -1047,6 +1049,20 @@ void ServerFamily::BreakOnShutdown() {
   dfly_cmd_->BreakOnShutdown();
 }
 
+string GetPassword() {
+  string flag = GetFlag(FLAGS_requirepass);
+  if (!flag.empty()) {
+    return flag;
+  }
+
+  const char* env_var = getenv("DFLY_PASSWORD");
+  if (env_var) {
+    return env_var;
+  }
+
+  return "";
+}
+
 void ServerFamily::FlushDb(CmdArgList args, ConnectionContext* cntx) {
   DCHECK(cntx->transaction);
   Drakarys(cntx->transaction, cntx->transaction->GetDbIndex());
@@ -1080,7 +1096,7 @@ void ServerFamily::Auth(CmdArgList args, ConnectionContext* cntx) {
   }
 
   string_view pass = ArgS(args, 1);
-  if (pass == GetFlag(FLAGS_requirepass)) {
+  if (pass == GetPassword()) {
     cntx->authenticated = true;
     (*cntx)->SendOk();
   } else {

src/server/server_family.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <boost/fiber/future.hpp>
+#include <string>
 
 #include "facade/conn_context.h"
 #include "facade/redis_parser.h"
@@ -20,6 +21,8 @@ class HttpListenerBase;
 
 namespace dfly {
 
+std::string GetPassword();
+
 namespace journal {
 class Journal;
 }  // namespace journal

tests/dragonfly/generic_test.py

@@ -1,3 +1,6 @@
+import os
+import aioredis
+import pytest
 from . import dfly_multi_test_args
 from .utility import batch_fill_data, gen_test_data
 
@@ -11,3 +14,36 @@ class TestKeys:
 
         keys = client.keys()
         assert len(keys) in range(max_keys, max_keys+512)
+
+@pytest.fixture(scope="function")
+def export_dfly_password() -> str:
+    pwd = 'flypwd'
+    os.environ['DFLY_PASSWORD'] = pwd
+    yield pwd
+    del os.environ['DFLY_PASSWORD']
+
+@pytest.mark.asyncio
+async def test_password(df_local_factory, export_dfly_password):
+    dfly = df_local_factory.create()
+    dfly.start()
+
+    # Expect password form environment variable
+    with pytest.raises(aioredis.exceptions.AuthenticationError):
+        client = aioredis.Redis()
+        await client.ping()
+    client = aioredis.Redis(password=export_dfly_password)
+    await client.ping()
+    dfly.stop()
+
+    # --requirepass should take precedence over environment variable
+    requirepass = 'requirepass'
+    dfly = df_local_factory.create(requirepass=requirepass)
+    dfly.start()
+
+    # Expect password form flag
+    with pytest.raises(aioredis.exceptions.ResponseError):
+        client = aioredis.Redis(password=export_dfly_password)
+        await client.ping()
+    client = aioredis.Redis(password=requirepass)
+    await client.ping()
+    dfly.stop()