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//
// ssl/impl/rfc2818_verification.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP
#define ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include <cctype>
#include <cstring>
#include "asio/ip/address.hpp"
#include "asio/ssl/rfc2818_verification.hpp"
#include "asio/ssl/detail/openssl_types.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ssl {
bool rfc2818_verification::operator()(
bool preverified, verify_context& ctx) const
{
using namespace std; // For memcmp.
// Don't bother looking at certificates that have failed pre-verification.
if (!preverified)
return false;
// We're only interested in checking the certificate at the end of the chain.
int depth = X509_STORE_CTX_get_error_depth(ctx.native_handle());
if (depth > 0)
return true;
// Try converting the host name to an address. If it is an address then we
// need to look for an IP address in the certificate rather than a host name.
asio::error_code ec;
ip::address address = ip::make_address(host_, ec);
bool is_address = !ec;
X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
// Go through the alternate names in the certificate looking for matching DNS
// or IP address entries.
GENERAL_NAMES* gens = static_cast<GENERAL_NAMES*>(
X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0));
for (int i = 0; i < sk_GENERAL_NAME_num(gens); ++i)
{
GENERAL_NAME* gen = sk_GENERAL_NAME_value(gens, i);
if (gen->type == GEN_DNS && !is_address)
{
ASN1_IA5STRING* domain = gen->d.dNSName;
if (domain->type == V_ASN1_IA5STRING && domain->data && domain->length)
{
const char* pattern = reinterpret_cast<const char*>(domain->data);
std::size_t pattern_length = domain->length;
if (match_pattern(pattern, pattern_length, host_.c_str()))
{
GENERAL_NAMES_free(gens);
return true;
}
}
}
else if (gen->type == GEN_IPADD && is_address)
{
ASN1_OCTET_STRING* ip_address = gen->d.iPAddress;
if (ip_address->type == V_ASN1_OCTET_STRING && ip_address->data)
{
if (address.is_v4() && ip_address->length == 4)
{
ip::address_v4::bytes_type bytes = address.to_v4().to_bytes();
if (memcmp(bytes.data(), ip_address->data, 4) == 0)
{
GENERAL_NAMES_free(gens);
return true;
}
}
else if (address.is_v6() && ip_address->length == 16)
{
ip::address_v6::bytes_type bytes = address.to_v6().to_bytes();
if (memcmp(bytes.data(), ip_address->data, 16) == 0)
{
GENERAL_NAMES_free(gens);
return true;
}
}
}
}
}
GENERAL_NAMES_free(gens);
// No match in the alternate names, so try the common names. We should only
// use the "most specific" common name, which is the last one in the list.
X509_NAME* name = X509_get_subject_name(cert);
int i = -1;
ASN1_STRING* common_name = 0;
while ((i = X509_NAME_get_index_by_NID(name, NID_commonName, i)) >= 0)
{
X509_NAME_ENTRY* name_entry = X509_NAME_get_entry(name, i);
common_name = X509_NAME_ENTRY_get_data(name_entry);
}
if (common_name && common_name->data && common_name->length)
{
const char* pattern = reinterpret_cast<const char*>(common_name->data);
std::size_t pattern_length = common_name->length;
if (match_pattern(pattern, pattern_length, host_.c_str()))
return true;
}
return false;
}
bool rfc2818_verification::match_pattern(const char* pattern,
std::size_t pattern_length, const char* host)
{
using namespace std; // For tolower.
const char* p = pattern;
const char* p_end = p + pattern_length;
const char* h = host;
while (p != p_end && *h)
{
if (*p == '*')
{
++p;
while (*h && *h != '.')
if (match_pattern(p, p_end - p, h++))
return true;
}
else if (tolower(*p) == tolower(*h))
{
++p;
++h;
}
else
{
return false;
}
}
return p == p_end && !*h;
}
} // namespace ssl
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP
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