ceph/src/boost/boost/asio/ssl/impl/rfc2818_verification.ipp

   1 //
   2 // ssl/impl/rfc2818_verification.ipp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP
  12 #define BOOST_ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if !defined(BOOST_ASIO_NO_DEPRECATED)
  21
  22 #include <cctype>
  23 #include <cstring>
  24 #include <boost/asio/ip/address.hpp>
  25 #include <boost/asio/ssl/rfc2818_verification.hpp>
  26 #include <boost/asio/ssl/detail/openssl_types.hpp>
  27
  28 #include <boost/asio/detail/push_options.hpp>
  29
  30 namespace boost {
  31 namespace asio {
  32 namespace ssl {
  33
  34 bool rfc2818_verification::operator()(
  35     bool preverified, verify_context& ctx) const
  36 {
  37   using namespace std; // For memcmp.
  38
  39   // Don't bother looking at certificates that have failed pre-verification.
  40   if (!preverified)
  41     return false;
  42
  43   // We're only interested in checking the certificate at the end of the chain.
  44   int depth = X509_STORE_CTX_get_error_depth(ctx.native_handle());
  45   if (depth > 0)
  46     return true;
  47
  48   // Try converting the host name to an address. If it is an address then we
  49   // need to look for an IP address in the certificate rather than a host name.
  50   boost::system::error_code ec;
  51   ip::address address = ip::make_address(host_, ec);
  52   bool is_address = !ec;
  53
  54   X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
  55
  56   // Go through the alternate names in the certificate looking for matching DNS
  57   // or IP address entries.
  58   GENERAL_NAMES* gens = static_cast<GENERAL_NAMES*>(
  59       X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0));
  60   for (int i = 0; i < sk_GENERAL_NAME_num(gens); ++i)
  61   {
  62     GENERAL_NAME* gen = sk_GENERAL_NAME_value(gens, i);
  63     if (gen->type == GEN_DNS && !is_address)
  64     {
  65       ASN1_IA5STRING* domain = gen->d.dNSName;
  66       if (domain->type == V_ASN1_IA5STRING && domain->data && domain->length)
  67       {
  68         const char* pattern = reinterpret_cast<const char*>(domain->data);
  69         std::size_t pattern_length = domain->length;
  70         if (match_pattern(pattern, pattern_length, host_.c_str()))
  71         {
  72           GENERAL_NAMES_free(gens);
  73           return true;
  74         }
  75       }
  76     }
  77     else if (gen->type == GEN_IPADD && is_address)
  78     {
  79       ASN1_OCTET_STRING* ip_address = gen->d.iPAddress;
  80       if (ip_address->type == V_ASN1_OCTET_STRING && ip_address->data)
  81       {
  82         if (address.is_v4() && ip_address->length == 4)
  83         {
  84           ip::address_v4::bytes_type bytes = address.to_v4().to_bytes();
  85           if (memcmp(bytes.data(), ip_address->data, 4) == 0)
  86           {
  87             GENERAL_NAMES_free(gens);
  88             return true;
  89           }
  90         }
  91         else if (address.is_v6() && ip_address->length == 16)
  92         {
  93           ip::address_v6::bytes_type bytes = address.to_v6().to_bytes();
  94           if (memcmp(bytes.data(), ip_address->data, 16) == 0)
  95           {
  96             GENERAL_NAMES_free(gens);
  97             return true;
  98           }
  99         }
 100       }
 101     }
 102   }
 103   GENERAL_NAMES_free(gens);
 104
 105   // No match in the alternate names, so try the common names. We should only
 106   // use the "most specific" common name, which is the last one in the list.
 107   X509_NAME* name = X509_get_subject_name(cert);
 108   int i = -1;
 109   ASN1_STRING* common_name = 0;
 110   while ((i = X509_NAME_get_index_by_NID(name, NID_commonName, i)) >= 0)
 111   {
 112     X509_NAME_ENTRY* name_entry = X509_NAME_get_entry(name, i);
 113     common_name = X509_NAME_ENTRY_get_data(name_entry);
 114   }
 115   if (common_name && common_name->data && common_name->length)
 116   {
 117     const char* pattern = reinterpret_cast<const char*>(common_name->data);
 118     std::size_t pattern_length = common_name->length;
 119     if (match_pattern(pattern, pattern_length, host_.c_str()))
 120       return true;
 121   }
 122
 123   return false;
 124 }
 125
 126 bool rfc2818_verification::match_pattern(const char* pattern,
 127     std::size_t pattern_length, const char* host)
 128 {
 129   using namespace std; // For tolower.
 130
 131   const char* p = pattern;
 132   const char* p_end = p + pattern_length;
 133   const char* h = host;
 134
 135   while (p != p_end && *h)
 136   {
 137     if (*p == '*')
 138     {
 139       ++p;
 140       while (*h && *h != '.')
 141         if (match_pattern(p, p_end - p, h++))
 142           return true;
 143     }
 144     else if (tolower(*p) == tolower(*h))
 145     {
 146       ++p;
 147       ++h;
 148     }
 149     else
 150     {
 151       return false;
 152     }
 153   }
 154
 155   return p == p_end && !*h;
 156 }
 157
 158 } // namespace ssl
 159 } // namespace asio
 160 } // namespace boost
 161
 162 #include <boost/asio/detail/pop_options.hpp>
 163
 164 #endif // !defined(BOOST_ASIO_NO_DEPRECATED)
 165
 166 #endif // BOOST_ASIO_SSL_IMPL_RFC2818_VERIFICATION_IPP