swaroop: store whole signer/decryption chains and private keys encrypted by machine...
[dcpomatic.git] / src / lib / config.cc
index eb26713655a575fd1135dee29ed91bc4a60a6a5c..04cf6dd9b5cfa12ae124bb9b1a44113964dd4263 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2019 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -179,6 +179,8 @@ Config::set_defaults ()
        _player_watermark_period = 1;
        _player_watermark_duration = 50;
        _player_lock_file = boost::none;
+       _signer_chain_path = "signer";
+       _decryption_chain_path = "decryption";
 #endif
 
        _allowed_dcp_frame_rates.clear ();
@@ -394,6 +396,21 @@ try
        }
 
        cxml::NodePtr signer = f.optional_node_child ("Signer");
+#ifdef DCPOMATIC_VARIANT_SWAROOP
+       if (signer && signer->node_children().size() == 1) {
+               /* The content of <Signer> is a path to a file; if it's relative it's in the same
+                  directory as .config. */
+               _signer_chain_path = signer->content();
+               if (_signer_chain_path.is_relative()) {
+                       _signer_chain = read_swaroop_chain (path(_signer_chain_path.string()));
+               } else {
+                       _signer_chain = read_swaroop_chain (_signer_chain_path);
+               }
+       } else {
+               /* <Signer> is not present or has children: ignore it and remake. */
+               _signer_chain = create_certificate_chain ();
+       }
+#else
        if (signer) {
                shared_ptr<dcp::CertificateChain> c (new dcp::CertificateChain ());
                /* Read the signing certificates and private key in from the config file */
@@ -406,6 +423,7 @@ try
                /* Make a new set of signing certificates and key */
                _signer_chain = create_certificate_chain ();
        }
+#endif
 
        /* These must be done before we call BadSignerChain as that might set one
           of the nags.
@@ -432,29 +450,32 @@ try
        }
 
        cxml::NodePtr decryption = f.optional_node_child ("Decryption");
+#ifdef DCPOMATIC_VARIANT_SWAROOP
+       if (decryption && decryption->node_children().size() == 1) {
+               /* The content of <Decryption> is a path to a file; if it's relative, it's in the same
+                  directory as .config. */
+               _decryption_chain_path = decryption->content();
+               if (_decryption_chain_path.is_relative()) {
+                       _decryption_chain = read_swaroop_chain (path(_decryption_chain_path.string()));
+               } else {
+                       _decryption_chain = read_swaroop_chain (_decryption_chain_path);
+               }
+       } else {
+               /* <Decryption> is not present or has more children: ignore it and remake. */
+               _decryption_chain = create_certificate_chain ();
+       }
+#else
        if (decryption) {
                shared_ptr<dcp::CertificateChain> c (new dcp::CertificateChain ());
                BOOST_FOREACH (cxml::NodePtr i, decryption->node_children ("Certificate")) {
                        c->add (dcp::Certificate (i->content ()));
                }
-               optional<string> key = decryption->optional_string_child ("PrivateKey");
-#ifdef DCPOMATIC_VARIANT_SWAROOP
-               if (key) {
-                       c->set_key (*key);
-               } else {
-                       dcp::Data encrypted_key (path("private"));
-                       dcp::Data iv (path("iv"));
-                       c->set_key (dcpomatic::decrypt (encrypted_key, key_from_uuid(), iv));
-               }
-#else
-               DCPOMATIC_ASSERT (key);
-               c->set_key (*key);
-#endif
+               c->set_key (decryption->string_child ("PrivateKey"));
                _decryption_chain = c;
        } else {
                _decryption_chain = create_certificate_chain ();
        }
-
+#endif
        if (f.optional_node_child("DKDMGroup")) {
                /* New-style: all DKDMs in a group */
                _dkdms = dynamic_pointer_cast<DKDMGroup> (DKDMBase::read (f.node_child("DKDMGroup")));
@@ -613,19 +634,6 @@ Config::write () const
        write_cinemas ();
 }
 
-#ifdef DCPOMATIC_VARIANT_SWAROOP
-/* Make up a key from the machine UUID */
-dcp::Data
-Config::key_from_uuid () const
-{
-       dcp::Data key (dcpomatic::crypto_key_length());
-       memset (key.data().get(), 0, key.size());
-       string const magic = command_and_read ("dcpomatic2_uuid");
-       strncpy ((char *) key.data().get(), magic.c_str(), dcpomatic::crypto_key_length());
-       return key;
-}
-#endif
-
 void
 Config::write_config () const
 {
@@ -793,25 +801,36 @@ Config::write_config () const
        /* [XML] Signer Certificate chain and private key to use when signing DCPs and KDMs.  Should contain <code>&lt;Certificate&gt;</code>
           tags in order and a <code>&lt;PrivateKey&gt;</code> tag all containing PEM-encoded certificates or private keys as appropriate.
        */
+#ifdef DCPOMATIC_VARIANT_SWAROOP
+       if (_signer_chain_path.is_relative()) {
+               write_swaroop_chain (_signer_chain, path(_signer_chain_path.string()));
+       } else {
+               write_swaroop_chain (_signer_chain, _signer_chain_path);
+       }
+       root->add_child("Signer")->add_child_text(_signer_chain_path.string());
+#else
        xmlpp::Element* signer = root->add_child ("Signer");
        DCPOMATIC_ASSERT (_signer_chain);
        BOOST_FOREACH (dcp::Certificate const & i, _signer_chain->unordered()) {
                signer->add_child("Certificate")->add_child_text (i.certificate (true));
        }
        signer->add_child("PrivateKey")->add_child_text (_signer_chain->key().get ());
+#endif
 
        /* [XML] Decryption Certificate chain and private key to use when decrypting KDMs */
+#ifdef DCPOMATIC_VARIANT_SWAROOP
+       if (_decryption_chain_path.is_relative()) {
+               write_swaroop_chain (_decryption_chain, path(_decryption_chain_path.string()));
+       } else {
+               write_swaroop_chain (_decryption_chain, _decryption_chain_path);
+       }
+       root->add_child("Decryption")->add_child_text(_decryption_chain_path.string());
+#else
        xmlpp::Element* decryption = root->add_child ("Decryption");
        DCPOMATIC_ASSERT (_decryption_chain);
        BOOST_FOREACH (dcp::Certificate const & i, _decryption_chain->unordered()) {
                decryption->add_child("Certificate")->add_child_text (i.certificate (true));
        }
-#ifdef DCPOMATIC_VARIANT_SWAROOP
-       dcp::Data iv = dcpomatic::random_iv ();
-       dcp::Data encrypted_key = dcpomatic::encrypt (_decryption_chain->key().get(), key_from_uuid(), iv);
-       encrypted_key.write (path("private"));
-       iv.write (path("iv"));
-#else
        decryption->add_child("PrivateKey")->add_child_text (_decryption_chain->key().get ());
 #endif
 
@@ -982,13 +1001,15 @@ Config::write_config () const
 
        try {
                string const s = doc.write_to_string_formatted ();
-               boost::filesystem::path const cf = config_file ();
-               FILE* f = fopen_boost (cf, "w");
+               boost::filesystem::path tmp (string(config_file().string()).append(".tmp"));
+               FILE* f = fopen_boost (tmp, "w");
                if (!f) {
-                       throw FileError (_("Could not open file for writing"), cf);
+                       throw FileError (_("Could not open file for writing"), tmp);
                }
-               checked_fwrite (s.c_str(), s.length(), f, cf);
+               checked_fwrite (s.c_str(), s.length(), f, tmp);
                fclose (f);
+               boost::filesystem::remove (config_file());
+               boost::filesystem::rename (tmp, config_file());
        } catch (xmlpp::exception& e) {
                string s = e.what ();
                trim (s);
@@ -1008,7 +1029,9 @@ Config::write_cinemas () const
        }
 
        try {
-               doc.write_to_file_formatted (_cinemas_file.string ());
+               doc.write_to_file_formatted (_cinemas_file.string() + ".tmp");
+               boost::filesystem::remove (_cinemas_file);
+               boost::filesystem::rename (_cinemas_file.string() + ".tmp", _cinemas_file);
        } catch (xmlpp::exception& e) {
                string s = e.what ();
                trim (s);
@@ -1233,10 +1256,16 @@ Config::config_file ()
        }
 
        /* See if there's a link */
-       f.read_file (main);
-       optional<string> link = f.optional_string_child("Link");
-       if (link) {
-               return *link;
+       try {
+               f.read_file (main);
+               optional<string> link = f.optional_string_child("Link");
+               if (link) {
+                       return *link;
+               }
+       } catch (xmlpp::exception& e) {
+               /* There as a problem reading the main configuration file,
+                  so there can't be a link.
+               */
        }
 
        return main;