mirror of
https://github.com/monero-project/monero.git
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570 lines
16 KiB
C++
570 lines
16 KiB
C++
// Copyright (c) 2014-2018, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "common/dns_utils.h"
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// check local first (in the event of static or in-source compilation of libunbound)
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#include "unbound.h"
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#include <stdlib.h>
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#include "include_base_utils.h"
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#include <random>
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#include <boost/filesystem/fstream.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/algorithm/string/join.hpp>
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using namespace epee;
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namespace bf = boost::filesystem;
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "net.dns"
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static const char *DEFAULT_DNS_PUBLIC_ADDR[] =
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{
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"194.150.168.168", // CCC (Germany)
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"81.3.27.54", // Lightning Wire Labs (Germany)
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"31.3.135.232", // OpenNIC (Switzerland)
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"80.67.169.40", // FDN (France)
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"209.58.179.186", // Cyberghost (Singapore)
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};
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static boost::mutex instance_lock;
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namespace
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{
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/*
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* The following two functions were taken from unbound-anchor.c, from
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* the unbound library packaged with this source. The license and source
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* can be found in $PROJECT_ROOT/external/unbound
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*/
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/* Cert builtin commented out until it's used, as the compiler complains
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// return the built in root update certificate
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static const char*
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get_builtin_cert(void)
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{
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return
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// The ICANN CA fetched at 24 Sep 2010. Valid to 2028
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"-----BEGIN CERTIFICATE-----\n"
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"MIIDdzCCAl+gAwIBAgIBATANBgkqhkiG9w0BAQsFADBdMQ4wDAYDVQQKEwVJQ0FO\n"
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"TjEmMCQGA1UECxMdSUNBTk4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkxFjAUBgNV\n"
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"BAMTDUlDQU5OIFJvb3QgQ0ExCzAJBgNVBAYTAlVTMB4XDTA5MTIyMzA0MTkxMloX\n"
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"DTI5MTIxODA0MTkxMlowXTEOMAwGA1UEChMFSUNBTk4xJjAkBgNVBAsTHUlDQU5O\n"
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"IENlcnRpZmljYXRpb24gQXV0aG9yaXR5MRYwFAYDVQQDEw1JQ0FOTiBSb290IENB\n"
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"MQswCQYDVQQGEwJVUzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKDb\n"
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"cLhPNNqc1NB+u+oVvOnJESofYS9qub0/PXagmgr37pNublVThIzyLPGCJ8gPms9S\n"
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"G1TaKNIsMI7d+5IgMy3WyPEOECGIcfqEIktdR1YWfJufXcMReZwU4v/AdKzdOdfg\n"
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"ONiwc6r70duEr1IiqPbVm5T05l1e6D+HkAvHGnf1LtOPGs4CHQdpIUcy2kauAEy2\n"
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"paKcOcHASvbTHK7TbbvHGPB+7faAztABLoneErruEcumetcNfPMIjXKdv1V1E3C7\n"
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"MSJKy+jAqqQJqjZoQGB0necZgUMiUv7JK1IPQRM2CXJllcyJrm9WFxY0c1KjBO29\n"
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"iIKK69fcglKcBuFShUECAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8B\n"
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"Af8EBAMCAf4wHQYDVR0OBBYEFLpS6UmDJIZSL8eZzfyNa2kITcBQMA0GCSqGSIb3\n"
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"DQEBCwUAA4IBAQAP8emCogqHny2UYFqywEuhLys7R9UKmYY4suzGO4nkbgfPFMfH\n"
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"6M+Zj6owwxlwueZt1j/IaCayoKU3QsrYYoDRolpILh+FPwx7wseUEV8ZKpWsoDoD\n"
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"2JFbLg2cfB8u/OlE4RYmcxxFSmXBg0yQ8/IoQt/bxOcEEhhiQ168H2yE5rxJMt9h\n"
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"15nu5JBSewrCkYqYYmaxyOC3WrVGfHZxVI7MpIFcGdvSb2a1uyuua8l0BKgk3ujF\n"
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"0/wsHNeP22qNyVO+XVBzrM8fk8BSUFuiT/6tZTYXRtEt5aKQZgXbKU5dUF3jT9qg\n"
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"j/Br5BZw3X/zd325TvnswzMC1+ljLzHnQGGk\n"
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"-----END CERTIFICATE-----\n"
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;
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}
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*/
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/** return the built in root DS trust anchor */
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static const char*
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get_builtin_ds(void)
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{
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return
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". IN DS 19036 8 2 49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5\n";
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}
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/************************************************************
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************************************************************
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***********************************************************/
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} // anonymous namespace
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namespace tools
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{
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// fuck it, I'm tired of dealing with getnameinfo()/inet_ntop/etc
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std::string ipv4_to_string(const char* src, size_t len)
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{
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assert(len >= 4);
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std::stringstream ss;
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unsigned int bytes[4];
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for (int i = 0; i < 4; i++)
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{
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unsigned char a = src[i];
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bytes[i] = a;
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}
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ss << bytes[0] << "."
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<< bytes[1] << "."
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<< bytes[2] << "."
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<< bytes[3];
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return ss.str();
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}
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// this obviously will need to change, but is here to reflect the above
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// stop-gap measure and to make the tests pass at least...
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std::string ipv6_to_string(const char* src, size_t len)
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{
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assert(len >= 8);
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std::stringstream ss;
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unsigned int bytes[8];
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for (int i = 0; i < 8; i++)
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{
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unsigned char a = src[i];
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bytes[i] = a;
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}
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ss << bytes[0] << ":"
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<< bytes[1] << ":"
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<< bytes[2] << ":"
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<< bytes[3] << ":"
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<< bytes[4] << ":"
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<< bytes[5] << ":"
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<< bytes[6] << ":"
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<< bytes[7];
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return ss.str();
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}
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std::string txt_to_string(const char* src, size_t len)
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{
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return std::string(src+1, len-1);
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}
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// custom smart pointer.
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// TODO: see if std::auto_ptr and the like support custom destructors
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template<typename type, void (*freefunc)(type*)>
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class scoped_ptr
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{
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public:
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scoped_ptr():
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ptr(nullptr)
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{
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}
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scoped_ptr(type *p):
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ptr(p)
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{
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}
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~scoped_ptr()
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{
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freefunc(ptr);
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}
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operator type *() { return ptr; }
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type **operator &() { return &ptr; }
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type *operator->() { return ptr; }
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operator const type*() const { return &ptr; }
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private:
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type* ptr;
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};
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typedef class scoped_ptr<ub_result,ub_resolve_free> ub_result_ptr;
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struct DNSResolverData
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{
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ub_ctx* m_ub_context;
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};
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// work around for bug https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=515 needed for it to compile on e.g. Debian 7
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class string_copy {
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public:
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string_copy(const char *s): str(strdup(s)) {}
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~string_copy() { free(str); }
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operator char*() { return str; }
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public:
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char *str;
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};
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DNSResolver::DNSResolver() : m_data(new DNSResolverData())
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{
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int use_dns_public = 0;
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std::vector<std::string> dns_public_addr;
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if (auto res = getenv("DNS_PUBLIC"))
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{
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dns_public_addr = tools::dns_utils::parse_dns_public(res);
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if (!dns_public_addr.empty())
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{
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MGINFO("Using public DNS server(s): " << boost::join(dns_public_addr, ", ") << " (TCP)");
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use_dns_public = 1;
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}
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else
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{
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MERROR("Failed to parse DNS_PUBLIC");
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}
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}
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// init libunbound context
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m_data->m_ub_context = ub_ctx_create();
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if (use_dns_public)
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{
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for (const auto &ip: dns_public_addr)
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ub_ctx_set_fwd(m_data->m_ub_context, string_copy(ip.c_str()));
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ub_ctx_set_option(m_data->m_ub_context, string_copy("do-udp:"), string_copy("no"));
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ub_ctx_set_option(m_data->m_ub_context, string_copy("do-tcp:"), string_copy("yes"));
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}
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else {
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// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
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ub_ctx_resolvconf(m_data->m_ub_context, NULL);
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ub_ctx_hosts(m_data->m_ub_context, NULL);
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}
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ub_ctx_add_ta(m_data->m_ub_context, string_copy(::get_builtin_ds()));
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}
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DNSResolver::~DNSResolver()
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{
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if (m_data)
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{
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if (m_data->m_ub_context != NULL)
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{
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ub_ctx_delete(m_data->m_ub_context);
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}
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delete m_data;
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}
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}
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std::vector<std::string> DNSResolver::get_record(const std::string& url, int record_type, std::string (*reader)(const char *,size_t), bool& dnssec_available, bool& dnssec_valid)
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{
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std::vector<std::string> addresses;
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dnssec_available = false;
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dnssec_valid = false;
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if (!check_address_syntax(url.c_str()))
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{
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return addresses;
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}
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// destructor takes care of cleanup
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ub_result_ptr result;
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// call DNS resolver, blocking. if return value not zero, something went wrong
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if (!ub_resolve(m_data->m_ub_context, string_copy(url.c_str()), record_type, DNS_CLASS_IN, &result))
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{
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dnssec_available = (result->secure || (!result->secure && result->bogus));
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dnssec_valid = result->secure && !result->bogus;
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if (result->havedata)
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{
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for (size_t i=0; result->data[i] != NULL; i++)
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{
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addresses.push_back((*reader)(result->data[i], result->len[i]));
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}
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}
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}
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return addresses;
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}
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std::vector<std::string> DNSResolver::get_ipv4(const std::string& url, bool& dnssec_available, bool& dnssec_valid)
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{
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return get_record(url, DNS_TYPE_A, ipv4_to_string, dnssec_available, dnssec_valid);
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}
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std::vector<std::string> DNSResolver::get_ipv6(const std::string& url, bool& dnssec_available, bool& dnssec_valid)
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{
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return get_record(url, DNS_TYPE_AAAA, ipv6_to_string, dnssec_available, dnssec_valid);
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}
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std::vector<std::string> DNSResolver::get_txt_record(const std::string& url, bool& dnssec_available, bool& dnssec_valid)
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{
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return get_record(url, DNS_TYPE_TXT, txt_to_string, dnssec_available, dnssec_valid);
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}
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std::string DNSResolver::get_dns_format_from_oa_address(const std::string& oa_addr)
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{
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std::string addr(oa_addr);
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auto first_at = addr.find("@");
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if (first_at == std::string::npos)
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return addr;
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// convert name@domain.tld to name.domain.tld
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addr.replace(first_at, 1, ".");
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return addr;
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}
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DNSResolver& DNSResolver::instance()
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{
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boost::lock_guard<boost::mutex> lock(instance_lock);
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static DNSResolver staticInstance;
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return staticInstance;
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}
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DNSResolver DNSResolver::create()
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{
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return DNSResolver();
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}
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bool DNSResolver::check_address_syntax(const char *addr) const
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{
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// if string doesn't contain a dot, we won't consider it a url for now.
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if (strchr(addr,'.') == NULL)
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{
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return false;
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}
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return true;
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}
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namespace dns_utils
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{
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//-----------------------------------------------------------------------
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// TODO: parse the string in a less stupid way, probably with regex
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std::string address_from_txt_record(const std::string& s)
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{
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// make sure the txt record has "oa1:xmr" and find it
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auto pos = s.find("oa1:xmr");
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if (pos == std::string::npos)
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return {};
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// search from there to find "recipient_address="
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pos = s.find("recipient_address=", pos);
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if (pos == std::string::npos)
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return {};
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pos += 18; // move past "recipient_address="
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// find the next semicolon
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auto pos2 = s.find(";", pos);
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if (pos2 != std::string::npos)
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{
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// length of address == 95, we can at least validate that much here
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if (pos2 - pos == 95)
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{
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return s.substr(pos, 95);
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}
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else if (pos2 - pos == 106) // length of address == 106 --> integrated address
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{
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return s.substr(pos, 106);
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}
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}
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return {};
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}
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/**
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* @brief gets a monero address from the TXT record of a DNS entry
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*
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* gets the monero address from the TXT record of the DNS entry associated
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* with <url>. If this lookup fails, or the TXT record does not contain an
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* XMR address in the correct format, returns an empty string. <dnssec_valid>
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* will be set true or false according to whether or not the DNS query passes
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* DNSSEC validation.
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*
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* @param url the url to look up
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* @param dnssec_valid return-by-reference for DNSSEC status of query
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*
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* @return a monero address (as a string) or an empty string
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*/
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std::vector<std::string> addresses_from_url(const std::string& url, bool& dnssec_valid)
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{
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std::vector<std::string> addresses;
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// get txt records
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bool dnssec_available, dnssec_isvalid;
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std::string oa_addr = DNSResolver::instance().get_dns_format_from_oa_address(url);
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auto records = DNSResolver::instance().get_txt_record(oa_addr, dnssec_available, dnssec_isvalid);
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// TODO: update this to allow for conveying that dnssec was not available
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if (dnssec_available && dnssec_isvalid)
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{
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dnssec_valid = true;
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}
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else dnssec_valid = false;
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// for each txt record, try to find a monero address in it.
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for (auto& rec : records)
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{
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std::string addr = address_from_txt_record(rec);
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if (addr.size())
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{
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addresses.push_back(addr);
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}
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}
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return addresses;
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}
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std::string get_account_address_as_str_from_url(const std::string& url, bool& dnssec_valid, std::function<std::string(const std::string&, const std::vector<std::string>&, bool)> dns_confirm)
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{
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// attempt to get address from dns query
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auto addresses = addresses_from_url(url, dnssec_valid);
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if (addresses.empty())
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{
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LOG_ERROR("wrong address: " << url);
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return {};
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}
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return dns_confirm(url, addresses, dnssec_valid);
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}
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namespace
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{
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bool dns_records_match(const std::vector<std::string>& a, const std::vector<std::string>& b)
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{
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if (a.size() != b.size()) return false;
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for (const auto& record_in_a : a)
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{
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bool ok = false;
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for (const auto& record_in_b : b)
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{
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if (record_in_a == record_in_b)
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{
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ok = true;
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break;
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}
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}
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if (!ok) return false;
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}
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return true;
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}
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}
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bool load_txt_records_from_dns(std::vector<std::string> &good_records, const std::vector<std::string> &dns_urls)
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{
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// Prevent infinite recursion when distributing
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if (dns_urls.empty()) return false;
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std::vector<std::vector<std::string> > records;
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records.resize(dns_urls.size());
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std::random_device rd;
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std::mt19937 gen(rd());
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std::uniform_int_distribution<int> dis(0, dns_urls.size() - 1);
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size_t first_index = dis(gen);
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// send all requests in parallel
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std::vector<boost::thread> threads(dns_urls.size());
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std::deque<bool> avail(dns_urls.size(), false), valid(dns_urls.size(), false);
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for (size_t n = 0; n < dns_urls.size(); ++n)
|
|
{
|
|
threads[n] = boost::thread([n, dns_urls, &records, &avail, &valid](){
|
|
records[n] = tools::DNSResolver::instance().get_txt_record(dns_urls[n], avail[n], valid[n]);
|
|
});
|
|
}
|
|
for (size_t n = 0; n < dns_urls.size(); ++n)
|
|
threads[n].join();
|
|
|
|
size_t cur_index = first_index;
|
|
do
|
|
{
|
|
const std::string &url = dns_urls[cur_index];
|
|
if (!avail[cur_index])
|
|
{
|
|
records[cur_index].clear();
|
|
LOG_PRINT_L2("DNSSEC not available for checkpoint update at URL: " << url << ", skipping.");
|
|
}
|
|
if (!valid[cur_index])
|
|
{
|
|
records[cur_index].clear();
|
|
LOG_PRINT_L2("DNSSEC validation failed for checkpoint update at URL: " << url << ", skipping.");
|
|
}
|
|
|
|
cur_index++;
|
|
if (cur_index == dns_urls.size())
|
|
{
|
|
cur_index = 0;
|
|
}
|
|
} while (cur_index != first_index);
|
|
|
|
size_t num_valid_records = 0;
|
|
|
|
for( const auto& record_set : records)
|
|
{
|
|
if (record_set.size() != 0)
|
|
{
|
|
num_valid_records++;
|
|
}
|
|
}
|
|
|
|
if (num_valid_records < 2)
|
|
{
|
|
LOG_PRINT_L0("WARNING: no two valid MoneroPulse DNS checkpoint records were received");
|
|
return false;
|
|
}
|
|
|
|
int good_records_index = -1;
|
|
for (size_t i = 0; i < records.size() - 1; ++i)
|
|
{
|
|
if (records[i].size() == 0) continue;
|
|
|
|
for (size_t j = i + 1; j < records.size(); ++j)
|
|
{
|
|
if (dns_records_match(records[i], records[j]))
|
|
{
|
|
good_records_index = i;
|
|
break;
|
|
}
|
|
}
|
|
if (good_records_index >= 0) break;
|
|
}
|
|
|
|
if (good_records_index < 0)
|
|
{
|
|
LOG_PRINT_L0("WARNING: no two MoneroPulse DNS checkpoint records matched");
|
|
return false;
|
|
}
|
|
|
|
good_records = records[good_records_index];
|
|
return true;
|
|
}
|
|
|
|
std::vector<std::string> parse_dns_public(const char *s)
|
|
{
|
|
unsigned ip0, ip1, ip2, ip3;
|
|
char c;
|
|
std::vector<std::string> dns_public_addr;
|
|
if (!strcmp(s, "tcp"))
|
|
{
|
|
for (size_t i = 0; i < sizeof(DEFAULT_DNS_PUBLIC_ADDR) / sizeof(DEFAULT_DNS_PUBLIC_ADDR[0]); ++i)
|
|
dns_public_addr.push_back(DEFAULT_DNS_PUBLIC_ADDR[i]);
|
|
LOG_PRINT_L0("Using default public DNS server(s): " << boost::join(dns_public_addr, ", ") << " (TCP)");
|
|
}
|
|
else if (sscanf(s, "tcp://%u.%u.%u.%u%c", &ip0, &ip1, &ip2, &ip3, &c) == 4)
|
|
{
|
|
if (ip0 > 255 || ip1 > 255 || ip2 > 255 || ip3 > 255)
|
|
{
|
|
MERROR("Invalid IP: " << s << ", using default");
|
|
}
|
|
else
|
|
{
|
|
dns_public_addr.push_back(std::string(s + strlen("tcp://")));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MERROR("Invalid DNS_PUBLIC contents, ignored");
|
|
}
|
|
return dns_public_addr;
|
|
}
|
|
|
|
} // namespace tools::dns_utils
|
|
|
|
} // namespace tools
|