pdns/doh.hh

   1 #pragma once
   2 #include "iputils.hh"
   3 #include "libssl.hh"
   4
   5 struct DOHServerConfig;
   6
   7 class DOHResponseMapEntry
   8 {
   9 public:
  10   DOHResponseMapEntry(const std::string& regex, uint16_t status, const std::string& content, const boost::optional<std::vector<std::pair<std::string, std::string>>>& headers): d_regex(regex), d_customHeaders(headers), d_content(content), d_status(status)
  11   {
  12   }
  13
  14   bool matches(const std::string& path) const
  15   {
  16     return d_regex.match(path);
  17   }
  18
  19   uint16_t getStatusCode() const
  20   {
  21     return d_status;
  22   }
  23
  24   const std::string& getContent() const
  25   {
  26     return d_content;
  27   }
  28
  29   const boost::optional<std::vector<std::pair<std::string, std::string>>>& getHeaders() const
  30   {
  31     return d_customHeaders;
  32   }
  33
  34 private:
  35   Regex d_regex;
  36   boost::optional<std::vector<std::pair<std::string, std::string>>> d_customHeaders;
  37   std::string d_content;
  38   uint16_t d_status;
  39 };
  40
  41 struct DOHFrontend
  42 {
  43   DOHFrontend()
  44   {
  45     d_rotatingTicketsKey.clear();
  46   }
  47
  48   std::shared_ptr<DOHServerConfig> d_dsc{nullptr};
  49   std::vector<std::pair<std::string, std::string>> d_certKeyPairs;
  50   std::vector<std::string> d_ocspFiles;
  51   std::vector<std::shared_ptr<DOHResponseMapEntry>> d_responsesMap;
  52   std::string d_ciphers;
  53   std::string d_ciphers13;
  54   std::string d_serverTokens{"h2o/dnsdist"};
  55   LibsslTLSVersion d_minTLSVersion{LibsslTLSVersion::TLS10};
  56 #ifdef HAVE_DNS_OVER_HTTPS
  57   std::unique_ptr<OpenSSLTLSTicketKeysRing> d_ticketKeys{nullptr};
  58 #endif
  59   std::vector<std::pair<std::string, std::string>> d_customResponseHeaders;
  60   ComboAddress d_local;
  61
  62   uint32_t d_idleTimeout{30};             // HTTP idle timeout in seconds
  63   std::vector<std::string> d_urls;
  64   std::string d_ticketKeyFile;
  65
  66   time_t d_ticketsKeyRotationDelay{43200};
  67   size_t d_maxStoredSessions{20480};
  68   uint8_t d_numberOfTicketsKeys{5};
  69   bool d_enableTickets{true};
  70   bool d_preferServerCiphers{false};
  71
  72   std::atomic<uint64_t> d_httpconnects;   // number of TCP/IP connections established
  73   std::atomic<uint64_t> d_tls10queries;   // valid DNS queries received via TLSv1.0
  74   std::atomic<uint64_t> d_tls11queries;   // valid DNS queries received via TLSv1.1
  75   std::atomic<uint64_t> d_tls12queries;   // valid DNS queries received via TLSv1.2
  76   std::atomic<uint64_t> d_tls13queries;   // valid DNS queries received via TLSv1.3
  77   std::atomic<uint64_t> d_tlsUnknownqueries;   // valid DNS queries received via unknown TLS version
  78
  79   std::atomic<uint64_t> d_getqueries;     // valid DNS queries received via GET
  80   std::atomic<uint64_t> d_postqueries;    // valid DNS queries received via POST
  81   std::atomic<uint64_t> d_badrequests;     // request could not be converted to dns query
  82   std::atomic<uint64_t> d_errorresponses; // dnsdist set 'error' on response
  83   std::atomic<uint64_t> d_redirectresponses; // dnsdist set 'redirect' on response
  84   std::atomic<uint64_t> d_validresponses; // valid responses sent out
  85
  86   struct HTTPVersionStats
  87   {
  88     std::atomic<uint64_t> d_nbQueries{0}; // valid DNS queries received
  89     std::atomic<uint64_t> d_nb200Responses{0};
  90     std::atomic<uint64_t> d_nb400Responses{0};
  91     std::atomic<uint64_t> d_nb403Responses{0};
  92     std::atomic<uint64_t> d_nb500Responses{0};
  93     std::atomic<uint64_t> d_nb502Responses{0};
  94     std::atomic<uint64_t> d_nbOtherResponses{0};
  95   };
  96
  97   HTTPVersionStats d_http1Stats;
  98   HTTPVersionStats d_http2Stats;
  99
 100
 101 #ifndef HAVE_DNS_OVER_HTTPS
 102   void setup()
 103   {
 104   }
 105
 106   void reloadCertificates()
 107   {
 108   }
 109
 110   void rotateTicketsKey(time_t now)
 111   {
 112   }
 113
 114   void loadTicketsKeys(const std::string& keyFile)
 115   {
 116   }
 117
 118   void handleTicketsKeyRotation()
 119   {
 120   }
 121
 122 #else
 123   void setup();
 124   void reloadCertificates();
 125
 126   void rotateTicketsKey(time_t now);
 127   void loadTicketsKeys(const std::string& keyFile);
 128   void handleTicketsKeyRotation();
 129
 130 #endif /* HAVE_DNS_OVER_HTTPS */
 131
 132 private:
 133   time_t d_ticketsKeyNextRotation{0};
 134   std::atomic_flag d_rotatingTicketsKey;
 135 };
 136
 137 #ifndef HAVE_DNS_OVER_HTTPS
 138 struct DOHUnit
 139 {
 140 };
 141
 142 #else /* HAVE_DNS_OVER_HTTPS */
 143 #include <unordered_map>
 144
 145 struct st_h2o_req_t;
 146
 147 struct DOHUnit
 148 {
 149   std::string query;
 150   std::string response;
 151   ComboAddress remote;
 152   ComboAddress dest;
 153   st_h2o_req_t* req{nullptr};
 154   DOHUnit** self{nullptr};
 155   std::string contentType;
 156   int rsock;
 157   uint16_t qtype;
 158   /* the status_code is set from
 159      processDOHQuery() (which is executed in
 160      the DOH client thread) so that the correct
 161      response can be sent in on_dnsdist(),
 162      after the DOHUnit has been passed back to
 163      the main DoH thread.
 164   */
 165   uint16_t status_code{200};
 166   bool ednsAdded{false};
 167
 168   std::string getHTTPPath() const;
 169   std::string getHTTPHost() const;
 170   std::string getHTTPScheme() const;
 171   std::string getHTTPQueryString() const;
 172   std::unordered_map<std::string, std::string> getHTTPHeaders() const;
 173   void setHTTPResponse(uint16_t statusCode, const std::string& body, const std::string& contentType="");
 174 };
 175
 176 #endif /* HAVE_DNS_OVER_HTTPS  */
 177
 178 void handleDOHTimeout(DOHUnit* oldDU);