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   std::shared_ptr<DOHServerConfig> d_dsc{nullptr};
  44   std::vector<std::pair<std::string, std::string>> d_certKeyPairs;
  45   std::vector<std::string> d_ocspFiles;
  46   std::vector<std::shared_ptr<DOHResponseMapEntry>> d_responsesMap;
  47   std::string d_ciphers;
  48   std::string d_ciphers13;
  49   std::string d_serverTokens{"h2o/dnsdist"};
  50   LibsslTLSVersion d_minTLSVersion{LibsslTLSVersion::TLS10};
  51 #ifdef HAVE_DNS_OVER_HTTPS
  52   std::unique_ptr<OpenSSLTLSTicketKeysRing> d_ticketKeys{nullptr};
  53 #endif
  54   std::vector<std::pair<std::string, std::string>> d_customResponseHeaders;
  55   ComboAddress d_local;
  56
  57   uint32_t d_idleTimeout{30};             // HTTP idle timeout in seconds
  58   std::vector<std::string> d_urls;
  59   std::string d_ticketKeyFile;
  60
  61   std::atomic_flag d_rotatingTicketsKey;
  62   time_t d_ticketsKeyRotationDelay{43200};
  63   time_t d_ticketsKeyNextRotation{0};
  64   size_t d_maxStoredSessions{20480};
  65   uint8_t d_numberOfTicketsKeys{5};
  66   bool d_enableTickets{true};
  67
  68   std::atomic<uint64_t> d_httpconnects{0};   // number of TCP/IP connections established
  69   std::atomic<uint64_t> d_getqueries{0};     // valid DNS queries received via GET
  70   std::atomic<uint64_t> d_postqueries{0};    // valid DNS queries received via POST
  71   std::atomic<uint64_t> d_badrequests{0};     // request could not be converted to dns query
  72   std::atomic<uint64_t> d_errorresponses{0}; // dnsdist set 'error' on response
  73   std::atomic<uint64_t> d_redirectresponses{0}; // dnsdist set 'redirect' on response
  74   std::atomic<uint64_t> d_validresponses{0}; // valid responses sent out
  75
  76   struct HTTPVersionStats
  77   {
  78     std::atomic<uint64_t> d_nbQueries{0}; // valid DNS queries received
  79     std::atomic<uint64_t> d_nb200Responses{0};
  80     std::atomic<uint64_t> d_nb400Responses{0};
  81     std::atomic<uint64_t> d_nb403Responses{0};
  82     std::atomic<uint64_t> d_nb500Responses{0};
  83     std::atomic<uint64_t> d_nb502Responses{0};
  84     std::atomic<uint64_t> d_nbOtherResponses{0};
  85   };
  86
  87   HTTPVersionStats d_http1Stats;
  88   HTTPVersionStats d_http2Stats;
  89
  90
  91 #ifndef HAVE_DNS_OVER_HTTPS
  92   void setup()
  93   {
  94   }
  95
  96   void reloadCertificates()
  97   {
  98   }
  99
 100   void rotateTicketsKey(time_t now)
 101   {
 102   }
 103
 104   void loadTicketsKeys(const std::string& keyFile)
 105   {
 106   }
 107
 108   void handleTicketsKeyRotation()
 109   {
 110   }
 111
 112 #else
 113   void setup();
 114   void reloadCertificates();
 115
 116   void rotateTicketsKey(time_t now);
 117   void loadTicketsKeys(const std::string& keyFile);
 118   void handleTicketsKeyRotation();
 119
 120 #endif /* HAVE_DNS_OVER_HTTPS */
 121 };
 122
 123 #ifndef HAVE_DNS_OVER_HTTPS
 124 struct DOHUnit
 125 {
 126 };
 127
 128 #else /* HAVE_DNS_OVER_HTTPS */
 129 #include <unordered_map>
 130
 131 struct st_h2o_req_t;
 132
 133 struct DOHUnit
 134 {
 135   std::string query;
 136   std::string response;
 137   ComboAddress remote;
 138   ComboAddress dest;
 139   st_h2o_req_t* req{nullptr};
 140   DOHUnit** self{nullptr};
 141   std::string contentType;
 142   int rsock;
 143   uint16_t qtype;
 144   /* the status_code is set from
 145      processDOHQuery() (which is executed in
 146      the DOH client thread) so that the correct
 147      response can be sent in on_dnsdist(),
 148      after the DOHUnit has been passed back to
 149      the main DoH thread.
 150   */
 151   uint16_t status_code{200};
 152   bool ednsAdded{false};
 153
 154   std::string getHTTPPath() const;
 155   std::string getHTTPHost() const;
 156   std::string getHTTPScheme() const;
 157   std::string getHTTPQueryString() const;
 158   std::unordered_map<std::string, std::string> getHTTPHeaders() const;
 159   void setHTTPResponse(uint16_t statusCode, const std::string& body, const std::string& contentType="");
 160 };
 161
 162 #endif /* HAVE_DNS_OVER_HTTPS  */
 163
 164 void handleDOHTimeout(DOHUnit* oldDU);