dbf46a721a
DNSSEC is now implemented with the hardcoded key from unbound. This will need to be not hardcoded in the future, but is okay for now. Unit tests updated for DNSSEC (as well as for the fact that, contrary to previous assumption, example.com does not have a static IP address).
313 lines
9.2 KiB
C++
313 lines
9.2 KiB
C++
// Copyright (c) 2014-2015, 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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#include <cstring>
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#include <sstream>
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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 <boost/filesystem/fstream.hpp>
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using namespace epee;
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namespace bf = boost::filesystem;
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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)
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{
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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)
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{
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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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// custom smart pointer.
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// TODO: see if std::auto_ptr and the like support custom destructors
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class ub_result_ptr
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{
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public:
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ub_result_ptr()
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{
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ptr = nullptr;
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}
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~ub_result_ptr()
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{
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ub_resolve_free(ptr);
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}
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ub_result* ptr;
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};
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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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DNSResolver::DNSResolver() : m_data(new DNSResolverData())
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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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char empty_string = '\0';
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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, &empty_string);
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ub_ctx_hosts(m_data->m_ub_context, &empty_string);
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ub_ctx_add_ta(m_data->m_ub_context, ::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_ipv4(const std::string& url, 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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char urlC[1000]; // waaaay too big, but just in case...
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strncpy(urlC, url.c_str(), 999);
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urlC[999] = '\0';
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if (!check_address_syntax(urlC))
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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, urlC, DNS_TYPE_A, DNS_CLASS_IN, &(result.ptr)))
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{
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dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus));
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dnssec_valid = !result.ptr->bogus;
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if (result.ptr->havedata)
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{
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for (size_t i=0; result.ptr->data[i] != NULL; i++)
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{
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addresses.push_back(ipv4_to_string(result.ptr->data[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_ipv6(const std::string& url, 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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char urlC[1000]; // waaaay too big, but just in case...
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strncpy(urlC, url.c_str(), 999);
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urlC[999] = '\0';
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if (!check_address_syntax(urlC))
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{
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return addresses;
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}
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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, urlC, DNS_TYPE_AAAA, DNS_CLASS_IN, &(result.ptr)))
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{
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dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus));
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dnssec_valid = !result.ptr->bogus;
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if (result.ptr->havedata)
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{
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for (size_t i=0; result.ptr->data[i] != NULL; i++)
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{
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addresses.push_back(ipv6_to_string(result.ptr->data[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_txt_record(const std::string& url, bool& dnssec_available, bool& dnssec_valid)
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{
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std::vector<std::string> records;
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dnssec_available = false;
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dnssec_valid = false;
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char urlC[1000]; // waaaay too big, but just in case...
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strncpy(urlC, url.c_str(), 999);
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urlC[999] = '\0';
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if (!check_address_syntax(urlC))
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{
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return records;
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}
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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, urlC, DNS_TYPE_TXT, DNS_CLASS_IN, &(result.ptr)))
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{
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dnssec_available = (result.ptr->secure || (!result.ptr->secure && result.ptr->bogus));
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dnssec_valid = !result.ptr->bogus;
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if (result.ptr->havedata)
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{
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for (size_t i=0; result.ptr->data[i] != NULL; i++)
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{
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// plz fix this, but this does NOT work and spills over into parts of memory it shouldn't: records.push_back(result.ptr->data[i]);
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char *restxt;
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restxt = (char*) calloc(result.ptr->len[i]+1, 1);
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memcpy(restxt, result.ptr->data[i]+1, result.ptr->len[i]-1);
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records.push_back(restxt);
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}
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}
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}
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return records;
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}
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DNSResolver& DNSResolver::instance()
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{
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static DNSResolver* staticInstance = NULL;
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if (staticInstance == NULL)
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{
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staticInstance = new DNSResolver();
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}
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return *staticInstance;
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}
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bool DNSResolver::check_address_syntax(const std::string& addr)
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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 (addr.find(".") == std::string::npos)
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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 tools
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