fix: increase consistency of rpcauth parsing

Previous rpcauth behavior was to sometimes
ignore empty -rpcauth= settings, and other times
treat them as errors.
Empty rpcauth is now consistently treated
as an error and prevents bitcoind from starting.
Updates associated test cases.
Also updates to non-deprecated logging macro.

Co-Authored-By: Luke Dashjr <luke-jr+git@utopios.org>
Co-Authored-By: Ryan Ofsky <ryan@ofsky.org>

src/httprpc.cpp

@@ -314,8 +314,9 @@ static bool InitRPCAuthentication()
         LogPrintf("Config options rpcuser and rpcpassword will soon be deprecated. Locally-run instances may remove rpcuser to use cookie-based auth, or may be replaced with rpcauth. Please see share/rpcauth for rpcauth auth generation.\n");
         strRPCUserColonPass = gArgs.GetArg("-rpcuser", "") + ":" + gArgs.GetArg("-rpcpassword", "");
     }
-    if (gArgs.GetArg("-rpcauth", "") != "") {
-        LogPrintf("Using rpcauth authentication.\n");
+
+    if (!gArgs.GetArgs("-rpcauth").empty()) {
+        LogInfo("Using rpcauth authentication.\n");
         for (const std::string& rpcauth : gArgs.GetArgs("-rpcauth")) {
             std::vector<std::string> fields{SplitString(rpcauth, ':')};
             const std::vector<std::string> salt_hmac{SplitString(fields.back(), '$')};

test/functional/rpc_users.py

@@ -139,11 +139,12 @@ class HTTPBasicsTest(BitcoinTestFramework):
         init_error = 'Error: Unable to start HTTP server. See debug log for details.'
 
         self.log.info('Check -rpcauth are validated')
-        self.log.info('Empty -rpcauth are ignored')
-        self.restart_node(0, extra_args=['-rpcauth'])
-        self.restart_node(0, extra_args=['-rpcauth='])
+        self.log.info('Empty -rpcauth are treated as error')
         self.stop_node(0)
+        self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth'])
+        self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth='])
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth=""'])
+        self.log.info('Check malformed -rpcauth')
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth=foo'])
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth=foo:bar'])
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth=foo:bar:baz'])
@@ -154,8 +155,7 @@ class HTTPBasicsTest(BitcoinTestFramework):
         # pw = bitcoin
         rpcauth_user1 = '-rpcauth=user1:6dd184e5e69271fdd69103464630014f$eb3d7ce67c4d1ff3564270519b03b636c0291012692a5fa3dd1d2075daedd07b'
         rpcauth_user2 = '-rpcauth=user2:57b2f77c919eece63cfa46c2f06e46ae$266b63902f99f97eeaab882d4a87f8667ab84435c3799f2ce042ef5a994d620b'
-        self.restart_node(0, extra_args=[rpcauth_user1, rpcauth_user2, '-rpcauth=']) # fixed in subsequent commit
-        self.stop_node(0)
+        self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=[rpcauth_user1, rpcauth_user2, '-rpcauth='])
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=[rpcauth_user1, '-rpcauth=', rpcauth_user2])
         self.nodes[0].assert_start_raises_init_error(expected_msg=init_error, extra_args=['-rpcauth=', rpcauth_user1, rpcauth_user2])