1 files changed, 402 insertions, 0 deletions
diff --git a/lib/remote/jsonrpcconnection-pki.cpp b/lib/remote/jsonrpcconnection-pki.cpp
new file mode 100644
index 0000000..d661dcf
--- /dev/null
+++ b/lib/remote/jsonrpcconnection-pki.cpp
@@ -0,0 +1,402 @@
+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#include "remote/jsonrpcconnection.hpp"
+#include "remote/apilistener.hpp"
+#include "remote/apifunction.hpp"
+#include "remote/jsonrpc.hpp"
+#include "base/configtype.hpp"
+#include "base/objectlock.hpp"
+#include "base/utility.hpp"
+#include "base/logger.hpp"
+#include "base/exception.hpp"
+#include "base/convert.hpp"
+#include <boost/thread/once.hpp>
+#include <boost/regex.hpp>
+#include <fstream>
+#include <openssl/ssl.h>
+#include <openssl/x509.h>
+
+using namespace icinga;
+
+static Value RequestCertificateHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params);
+REGISTER_APIFUNCTION(RequestCertificate, pki, &RequestCertificateHandler);
+static Value UpdateCertificateHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params);
+REGISTER_APIFUNCTION(UpdateCertificate, pki, &UpdateCertificateHandler);
+
+Value RequestCertificateHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params)
+{
+	String certText = params->Get("cert_request");
+
+	std::shared_ptr<X509> cert;
+
+	Dictionary::Ptr result = new Dictionary();
+
+	/* Use the presented client certificate if not provided. */
+	if (certText.IsEmpty()) {
+		auto stream (origin->FromClient->GetStream());
+		cert = stream->next_layer().GetPeerCertificate();
+	} else {
+		cert = StringToCertificate(certText);
+	}
+
+	if (!cert) {
+		Log(LogWarning, "JsonRpcConnection") << "No certificate or CSR received";
+
+		result->Set("status_code", 1);
+		result->Set("error", "No certificate or CSR received.");
+
+		return result;
+	}
+
+	ApiListener::Ptr listener = ApiListener::GetInstance();
+	std::shared_ptr<X509> cacert = GetX509Certificate(listener->GetDefaultCaPath());
+
+	String cn = GetCertificateCN(cert);
+
+	bool signedByCA = false;
+
+	{
+		Log logmsg(LogInformation, "JsonRpcConnection");
+		logmsg << "Received certificate request for CN '" << cn << "'";
+
+		try {
+			signedByCA = VerifyCertificate(cacert, cert, listener->GetCrlPath());
+			if (!signedByCA) {
+				logmsg << " not";
+			}
+			logmsg << " signed by our CA.";
+		} catch (const std::exception &ex) {
+			logmsg << " not signed by our CA";
+			if (const unsigned long *openssl_code = boost::get_error_info<errinfo_openssl_error>(ex)) {
+				logmsg << ": " << X509_verify_cert_error_string(long(*openssl_code)) << " (code " << *openssl_code << ")";
+			} else {
+				logmsg << ".";
+			}
+		}
+	}
+
+	if (signedByCA) {
+		if (IsCertUptodate(cert)) {
+
+			Log(LogInformation, "JsonRpcConnection")
+				<< "The certificate for CN '" << cn << "' is valid and uptodate. Skipping automated renewal.";
+			result->Set("status_code", 1);
+			result->Set("error", "The certificate for CN '" + cn + "' is valid and uptodate. Skipping automated renewal.");
+			return result;
+		}
+	}
+
+	unsigned int n;
+	unsigned char digest[EVP_MAX_MD_SIZE];
+
+	if (!X509_digest(cert.get(), EVP_sha256(), digest, &n)) {
+		result->Set("status_code", 1);
+		result->Set("error", "Could not calculate fingerprint for the X509 certificate for CN '" + cn + "'.");
+
+		Log(LogWarning, "JsonRpcConnection")
+			<< "Could not calculate fingerprint for the X509 certificate requested for CN '"
+			<< cn << "'.";
+
+		return result;
+	}
+
+	char certFingerprint[EVP_MAX_MD_SIZE*2+1];
+	for (unsigned int i = 0; i < n; i++)
+		sprintf(certFingerprint + 2 * i, "%02x", digest[i]);
+
+	result->Set("fingerprint_request", certFingerprint);
+
+	String requestDir = ApiListener::GetCertificateRequestsDir();
+	String requestPath = requestDir + "/" + certFingerprint + ".json";
+
+	result->Set("ca", CertificateToString(cacert));
+
+	JsonRpcConnection::Ptr client = origin->FromClient;
+
+	/* If we already have a signed certificate request, send it to the client. */
+	if (Utility::PathExists(requestPath)) {
+		Dictionary::Ptr request = Utility::LoadJsonFile(requestPath);
+
+		String certResponse = request->Get("cert_response");
+
+		if (!certResponse.IsEmpty()) {
+			Log(LogInformation, "JsonRpcConnection")
+				<< "Sending certificate response for CN '" << cn
+				<< "' to endpoint '" << client->GetIdentity() << "'.";
+
+			result->Set("cert", certResponse);
+			result->Set("status_code", 0);
+
+			Dictionary::Ptr message = new Dictionary({
+				{ "jsonrpc", "2.0" },
+				{ "method", "pki::UpdateCertificate" },
+				{ "params", result }
+			});
+			client->SendMessage(message);
+
+			return result;
+		}
+	} else if (Utility::PathExists(requestDir + "/" + certFingerprint + ".removed")) {
+		Log(LogInformation, "JsonRpcConnection")
+			<< "Certificate for CN " << cn << " has been removed. Ignoring signing request.";
+		result->Set("status_code", 1);
+		result->Set("error", "Ticket for CN " + cn + " declined by administrator.");
+		return result;
+	}
+
+	std::shared_ptr<X509> newcert;
+	Dictionary::Ptr message;
+	String ticket;
+
+	/* Check whether we are a signing instance or we
+	 * must delay the signing request.
+	 */
+	if (!Utility::PathExists(GetIcingaCADir() + "/ca.key"))
+		goto delayed_request;
+
+	if (!signedByCA) {
+		String salt = listener->GetTicketSalt();
+
+		ticket = params->Get("ticket");
+
+		// Auto-signing is disabled: Client did not include a ticket in its request.
+		if (ticket.IsEmpty()) {
+			Log(LogNotice, "JsonRpcConnection")
+				<< "Certificate request for CN '" << cn
+				<< "': No ticket included, skipping auto-signing and waiting for on-demand signing approval.";
+
+			goto delayed_request;
+		}
+
+		// Auto-signing is disabled: no TicketSalt
+		if (salt.IsEmpty()) {
+			Log(LogNotice, "JsonRpcConnection")
+				<< "Certificate request for CN '" << cn
+				<< "': This instance is the signing master for the Icinga CA."
+				<< " The 'ticket_salt' attribute in the 'api' feature is not set."
+				<< " Not signing the request. Please check the docs.";
+
+			goto delayed_request;
+		}
+
+		String realTicket = PBKDF2_SHA1(cn, salt, 50000);
+
+		Log(LogDebug, "JsonRpcConnection")
+			<< "Certificate request for CN '" << cn << "': Comparing received ticket '"
+			<< ticket << "' with calculated ticket '" << realTicket << "'.";
+
+		if (!Utility::ComparePasswords(ticket, realTicket)) {
+			Log(LogWarning, "JsonRpcConnection")
+				<< "Ticket '" << ticket << "' for CN '" << cn << "' is invalid.";
+
+			result->Set("status_code", 1);
+			result->Set("error", "Invalid ticket for CN '" + cn + "'.");
+			return result;
+		}
+	}
+
+	newcert = listener->RenewCert(cert);
+
+	if (!newcert) {
+		goto delayed_request;
+	}
+
+	/* Send the signed certificate update. */
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Sending certificate response for CN '" << cn << "' to endpoint '"
+		<< client->GetIdentity() << "'" << (!ticket.IsEmpty() ? " (auto-signing ticket)" : "" ) << ".";
+
+	result->Set("cert", CertificateToString(newcert));
+
+	result->Set("status_code", 0);
+
+	message = new Dictionary({
+		{ "jsonrpc", "2.0" },
+		{ "method", "pki::UpdateCertificate" },
+		{ "params", result }
+	});
+	client->SendMessage(message);
+
+	return result;
+
+delayed_request:
+	/* Send a delayed certificate signing request. */
+	Utility::MkDirP(requestDir, 0700);
+
+	Dictionary::Ptr request = new Dictionary({
+		{ "cert_request", CertificateToString(cert) },
+		{ "ticket", params->Get("ticket") }
+	});
+
+	Utility::SaveJsonFile(requestPath, 0600, request);
+
+	JsonRpcConnection::SendCertificateRequest(nullptr, origin, requestPath);
+
+	result->Set("status_code", 2);
+	result->Set("error", "Certificate request for CN '" + cn + "' is pending. Waiting for approval from the parent Icinga instance.");
+
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Certificate request for CN '" << cn << "' is pending. Waiting for approval.";
+
+	if (origin) {
+		auto client (origin->FromClient);
+
+		if (client && !client->GetEndpoint()) {
+			client->Disconnect();
+		}
+	}
+
+	return result;
+}
+
+void JsonRpcConnection::SendCertificateRequest(const JsonRpcConnection::Ptr& aclient, const MessageOrigin::Ptr& origin, const String& path)
+{
+	Dictionary::Ptr message = new Dictionary();
+	message->Set("jsonrpc", "2.0");
+	message->Set("method", "pki::RequestCertificate");
+
+	ApiListener::Ptr listener = ApiListener::GetInstance();
+
+	if (!listener)
+		return;
+
+	Dictionary::Ptr params = new Dictionary();
+	message->Set("params", params);
+
+	/* Path is empty if this is our own request. */
+	if (path.IsEmpty()) {
+		{
+			Log msg (LogInformation, "JsonRpcConnection");
+			msg << "Requesting new certificate for this Icinga instance";
+
+			if (aclient) {
+				msg << " from endpoint '" << aclient->GetIdentity() << "'";
+			}
+
+			msg << ".";
+		}
+
+		String ticketPath = ApiListener::GetCertsDir() + "/ticket";
+
+		std::ifstream fp(ticketPath.CStr());
+		String ticket((std::istreambuf_iterator<char>(fp)), std::istreambuf_iterator<char>());
+		fp.close();
+
+		params->Set("ticket", ticket);
+	} else {
+		Dictionary::Ptr request = Utility::LoadJsonFile(path);
+
+		if (request->Contains("cert_response"))
+			return;
+
+		params->Set("cert_request", request->Get("cert_request"));
+		params->Set("ticket", request->Get("ticket"));
+	}
+
+	/* Send the request to a) the connected client
+	 * or b) the local zone and all parents.
+	 */
+	if (aclient)
+		aclient->SendMessage(message);
+	else
+		listener->RelayMessage(origin, Zone::GetLocalZone(), message, false);
+}
+
+Value UpdateCertificateHandler(const MessageOrigin::Ptr& origin, const Dictionary::Ptr& params)
+{
+	if (origin->FromZone && !Zone::GetLocalZone()->IsChildOf(origin->FromZone)) {
+		Log(LogWarning, "ClusterEvents")
+			<< "Discarding 'update certificate' message from '" << origin->FromClient->GetIdentity() << "': Invalid endpoint origin (client not allowed).";
+
+		return Empty;
+	}
+
+	String ca = params->Get("ca");
+	String cert = params->Get("cert");
+
+	ApiListener::Ptr listener = ApiListener::GetInstance();
+
+	if (!listener)
+		return Empty;
+
+	std::shared_ptr<X509> oldCert = GetX509Certificate(listener->GetDefaultCertPath());
+	std::shared_ptr<X509> newCert = StringToCertificate(cert);
+
+	String cn = GetCertificateCN(newCert);
+
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Received certificate update message for CN '" << cn << "'";
+
+	/* Check if this is a certificate update for a subordinate instance. */
+	std::shared_ptr<EVP_PKEY> oldKey = std::shared_ptr<EVP_PKEY>(X509_get_pubkey(oldCert.get()), EVP_PKEY_free);
+	std::shared_ptr<EVP_PKEY> newKey = std::shared_ptr<EVP_PKEY>(X509_get_pubkey(newCert.get()), EVP_PKEY_free);
+
+	if (X509_NAME_cmp(X509_get_subject_name(oldCert.get()), X509_get_subject_name(newCert.get())) != 0 ||
+		EVP_PKEY_cmp(oldKey.get(), newKey.get()) != 1) {
+		String certFingerprint = params->Get("fingerprint_request");
+
+		/* Validate the fingerprint format. */
+		boost::regex expr("^[0-9a-f]+$");
+
+		if (!boost::regex_match(certFingerprint.GetData(), expr)) {
+			Log(LogWarning, "JsonRpcConnection")
+				<< "Endpoint '" << origin->FromClient->GetIdentity() << "' sent an invalid certificate fingerprint: '"
+				<< certFingerprint << "' for CN '" << cn << "'.";
+			return Empty;
+		}
+
+		String requestDir = ApiListener::GetCertificateRequestsDir();
+		String requestPath = requestDir + "/" + certFingerprint + ".json";
+
+		/* Save the received signed certificate request to disk. */
+		if (Utility::PathExists(requestPath)) {
+			Log(LogInformation, "JsonRpcConnection")
+				<< "Saved certificate update for CN '" << cn << "'";
+
+			Dictionary::Ptr request = Utility::LoadJsonFile(requestPath);
+			request->Set("cert_response", cert);
+			Utility::SaveJsonFile(requestPath, 0644, request);
+		}
+
+		return Empty;
+	}
+
+	/* Update CA certificate. */
+	String caPath = listener->GetDefaultCaPath();
+
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Updating CA certificate in '" << caPath << "'.";
+
+	std::fstream cafp;
+	String tempCaPath = Utility::CreateTempFile(caPath + ".XXXXXX", 0644, cafp);
+	cafp << ca;
+	cafp.close();
+
+	Utility::RenameFile(tempCaPath, caPath);
+
+	/* Update signed certificate. */
+	String certPath = listener->GetDefaultCertPath();
+
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Updating client certificate for CN '" << cn << "' in '" << certPath << "'.";
+
+	std::fstream certfp;
+	String tempCertPath = Utility::CreateTempFile(certPath + ".XXXXXX", 0644, certfp);
+	certfp << cert;
+	certfp.close();
+
+	Utility::RenameFile(tempCertPath, certPath);
+
+	/* Remove ticket for successful signing request. */
+	String ticketPath = ApiListener::GetCertsDir() + "/ticket";
+
+	Utility::Remove(ticketPath);
+
+	/* Update the certificates at runtime and reconnect all endpoints. */
+	Log(LogInformation, "JsonRpcConnection")
+		<< "Updating the client certificate for CN '" << cn << "' at runtime and reconnecting the endpoints.";
+
+	listener->UpdateSSLContext();
+
+	return Empty;
+}