ceph/src/rgw/rgw_auth_s3.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab ft=cpp
   3
   4 #ifndef CEPH_RGW_AUTH_S3_H
   5 #define CEPH_RGW_AUTH_S3_H
   6
   7 #include <array>
   8 #include <memory>
   9 #include <string>
  10 #include <string_view>
  11 #include <tuple>
  12
  13 #include <boost/algorithm/string.hpp>
  14 #include <boost/container/static_vector.hpp>
  15
  16 #include "common/sstring.hh"
  17 #include "rgw_common.h"
  18 #include "rgw_rest_s3.h"
  19 #include "rgw_auth.h"
  20 #include "rgw_auth_filters.h"
  21 #include "rgw_auth_keystone.h"
  22
  23
  24 namespace rgw {
  25 namespace auth {
  26 namespace s3 {
  27
  28 static constexpr auto RGW_AUTH_GRACE = std::chrono::minutes{15};
  29
  30 // returns true if the request time is within RGW_AUTH_GRACE of the current time
  31 bool is_time_skew_ok(time_t t);
  32
  33 class STSAuthStrategy : public rgw::auth::Strategy,
  34                         public rgw::auth::RemoteApplier::Factory,
  35                         public rgw::auth::LocalApplier::Factory,
  36                         public rgw::auth::RoleApplier::Factory {
  37   typedef rgw::auth::IdentityApplier::aplptr_t aplptr_t;
  38   rgw::sal::Store* store;
  39   rgw::auth::ImplicitTenants& implicit_tenant_context;
  40
  41   STSEngine  sts_engine;
  42
  43   aplptr_t create_apl_remote(CephContext* const cct,
  44                              const req_state* const s,
  45                              rgw::auth::RemoteApplier::acl_strategy_t&& acl_alg,
  46                              const rgw::auth::RemoteApplier::AuthInfo &info) const override {
  47     auto apl = rgw::auth::add_sysreq(cct, store, s,
  48       rgw::auth::RemoteApplier(cct, store, std::move(acl_alg), info,
  49                                implicit_tenant_context,
  50                                rgw::auth::ImplicitTenants::IMPLICIT_TENANTS_S3));
  51     return aplptr_t(new decltype(apl)(std::move(apl)));
  52   }
  53
  54   aplptr_t create_apl_local(CephContext* const cct,
  55                             const req_state* const s,
  56                             const RGWUserInfo& user_info,
  57                             const std::string& subuser,
  58                             const std::optional<uint32_t>& perm_mask,
  59                             const std::string& access_key_id) const override {
  60     auto apl = rgw::auth::add_sysreq(cct, store, s,
  61       rgw::auth::LocalApplier(cct, user_info, subuser, perm_mask, access_key_id));
  62     return aplptr_t(new decltype(apl)(std::move(apl)));
  63   }
  64
  65   aplptr_t create_apl_role(CephContext* const cct,
  66                             const req_state* const s,
  67                             const rgw::auth::RoleApplier::Role& role,
  68                             const rgw::auth::RoleApplier::TokenAttrs& token_attrs) const override {
  69     auto apl = rgw::auth::add_sysreq(cct, store, s,
  70       rgw::auth::RoleApplier(cct, role, token_attrs));
  71     return aplptr_t(new decltype(apl)(std::move(apl)));
  72   }
  73
  74 public:
  75   STSAuthStrategy(CephContext* const cct,
  76                        rgw::sal::Store* store,
  77                        rgw::auth::ImplicitTenants& implicit_tenant_context,
  78                        AWSEngine::VersionAbstractor* const ver_abstractor)
  79     : store(store),
  80       implicit_tenant_context(implicit_tenant_context),
  81       sts_engine(cct, store, *ver_abstractor,
  82                   static_cast<rgw::auth::LocalApplier::Factory*>(this),
  83                   static_cast<rgw::auth::RemoteApplier::Factory*>(this),
  84                   static_cast<rgw::auth::RoleApplier::Factory*>(this)) {
  85       if (cct->_conf->rgw_s3_auth_use_sts) {
  86         add_engine(Control::SUFFICIENT, sts_engine);
  87       }
  88     }
  89
  90   const char* get_name() const noexcept override {
  91     return "rgw::auth::s3::STSAuthStrategy";
  92   }
  93 };
  94
  95 class ExternalAuthStrategy : public rgw::auth::Strategy,
  96                              public rgw::auth::RemoteApplier::Factory {
  97   typedef rgw::auth::IdentityApplier::aplptr_t aplptr_t;
  98   rgw::sal::Store* store;
  99   rgw::auth::ImplicitTenants& implicit_tenant_context;
 100
 101   using keystone_config_t = rgw::keystone::CephCtxConfig;
 102   using keystone_cache_t = rgw::keystone::TokenCache;
 103   using secret_cache_t = rgw::auth::keystone::SecretCache;
 104   using EC2Engine = rgw::auth::keystone::EC2Engine;
 105
 106   boost::optional <EC2Engine> keystone_engine;
 107   LDAPEngine ldap_engine;
 108
 109   aplptr_t create_apl_remote(CephContext* const cct,
 110                              const req_state* const s,
 111                              rgw::auth::RemoteApplier::acl_strategy_t&& acl_alg,
 112                              const rgw::auth::RemoteApplier::AuthInfo &info) const override {
 113     auto apl = rgw::auth::add_sysreq(cct, store, s,
 114       rgw::auth::RemoteApplier(cct, store, std::move(acl_alg), info,
 115                                implicit_tenant_context,
 116                                rgw::auth::ImplicitTenants::IMPLICIT_TENANTS_S3));
 117     /* TODO(rzarzynski): replace with static_ptr. */
 118     return aplptr_t(new decltype(apl)(std::move(apl)));
 119   }
 120
 121 public:
 122   ExternalAuthStrategy(CephContext* const cct,
 123                        rgw::sal::Store* store,
 124                        rgw::auth::ImplicitTenants& implicit_tenant_context,
 125                        AWSEngine::VersionAbstractor* const ver_abstractor)
 126     : store(store),
 127       implicit_tenant_context(implicit_tenant_context),
 128       ldap_engine(cct, store, *ver_abstractor,
 129                   static_cast<rgw::auth::RemoteApplier::Factory*>(this)) {
 130
 131     if (cct->_conf->rgw_s3_auth_use_keystone &&
 132         ! cct->_conf->rgw_keystone_url.empty()) {
 133
 134       keystone_engine.emplace(cct, ver_abstractor,
 135                               static_cast<rgw::auth::RemoteApplier::Factory*>(this),
 136                               keystone_config_t::get_instance(),
 137                               keystone_cache_t::get_instance<keystone_config_t>(),
 138                               secret_cache_t::get_instance());
 139       add_engine(Control::SUFFICIENT, *keystone_engine);
 140
 141     }
 142
 143     if (ldap_engine.valid()) {
 144       add_engine(Control::SUFFICIENT, ldap_engine);
 145     }
 146   }
 147
 148   const char* get_name() const noexcept override {
 149     return "rgw::auth::s3::AWSv2ExternalAuthStrategy";
 150   }
 151 };
 152
 153
 154 template <class AbstractorT,
 155           bool AllowAnonAccessT = false>
 156 class AWSAuthStrategy : public rgw::auth::Strategy,
 157                         public rgw::auth::LocalApplier::Factory {
 158   typedef rgw::auth::IdentityApplier::aplptr_t aplptr_t;
 159
 160   static_assert(std::is_base_of<rgw::auth::s3::AWSEngine::VersionAbstractor,
 161                                 AbstractorT>::value,
 162                 "AbstractorT must be a subclass of rgw::auth::s3::VersionAbstractor");
 163
 164   rgw::sal::Store* store;
 165   AbstractorT ver_abstractor;
 166
 167   S3AnonymousEngine anonymous_engine;
 168   ExternalAuthStrategy external_engines;
 169   STSAuthStrategy sts_engine;
 170   LocalEngine local_engine;
 171
 172   aplptr_t create_apl_local(CephContext* const cct,
 173                             const req_state* const s,
 174                             const RGWUserInfo& user_info,
 175                             const std::string& subuser,
 176                             const std::optional<uint32_t>& perm_mask,
 177                             const std::string& access_key_id) const override {
 178     auto apl = rgw::auth::add_sysreq(cct, store, s,
 179       rgw::auth::LocalApplier(cct, user_info, subuser, perm_mask, access_key_id));
 180     /* TODO(rzarzynski): replace with static_ptr. */
 181     return aplptr_t(new decltype(apl)(std::move(apl)));
 182   }
 183
 184 public:
 185   using engine_map_t = std::map <std::string, std::reference_wrapper<const Engine>>;
 186   void add_engines(const std::vector <std::string>& auth_order,
 187                    engine_map_t eng_map)
 188   {
 189     auto ctrl_flag = Control::SUFFICIENT;
 190     for (const auto &eng : auth_order) {
 191       // fallback to the last engine, in case of multiple engines, since ctrl
 192       // flag is sufficient for others, error from earlier engine is returned
 193       if (&eng == &auth_order.back() && eng_map.size() > 1) {
 194         ctrl_flag = Control::FALLBACK;
 195       }
 196       if (const auto kv = eng_map.find(eng);
 197           kv != eng_map.end()) {
 198         add_engine(ctrl_flag, kv->second);
 199       }
 200     }
 201   }
 202
 203   auto parse_auth_order(CephContext* const cct)
 204   {
 205     std::vector <std::string> result;
 206
 207     const std::set <std::string_view> allowed_auth = { "sts", "external", "local" };
 208     std::vector <std::string> default_order = { "sts", "external", "local" };
 209     // supplied strings may contain a space, so let's bypass that
 210     boost::split(result, cct->_conf->rgw_s3_auth_order,
 211                  boost::is_any_of(", "), boost::token_compress_on);
 212
 213     if (std::any_of(result.begin(), result.end(),
 214                     [allowed_auth](std::string_view s)
 215                     { return allowed_auth.find(s) == allowed_auth.end();})){
 216       return default_order;
 217     }
 218     return result;
 219   }
 220
 221   AWSAuthStrategy(CephContext* const cct,
 222                   rgw::auth::ImplicitTenants& implicit_tenant_context,
 223                   rgw::sal::Store* store)
 224     : store(store),
 225       ver_abstractor(cct),
 226       anonymous_engine(cct,
 227                        static_cast<rgw::auth::LocalApplier::Factory*>(this)),
 228       external_engines(cct, store, implicit_tenant_context, &ver_abstractor),
 229       sts_engine(cct, store, implicit_tenant_context, &ver_abstractor),
 230       local_engine(cct, store, ver_abstractor,
 231                    static_cast<rgw::auth::LocalApplier::Factory*>(this)) {
 232     /* The anonymous auth. */
 233     if (AllowAnonAccessT) {
 234       add_engine(Control::SUFFICIENT, anonymous_engine);
 235     }
 236
 237     auto auth_order = parse_auth_order(cct);
 238     engine_map_t engine_map;
 239
 240     /* STS Auth*/
 241     if (! sts_engine.is_empty()) {
 242       engine_map.insert(std::make_pair("sts", std::cref(sts_engine)));
 243     }
 244
 245     /* The external auth. */
 246     if (! external_engines.is_empty()) {
 247       engine_map.insert(std::make_pair("external", std::cref(external_engines)));
 248     }
 249     /* The local auth. */
 250     if (cct->_conf->rgw_s3_auth_use_rados) {
 251       engine_map.insert(std::make_pair("local", std::cref(local_engine)));
 252     }
 253
 254     add_engines(auth_order, engine_map);
 255   }
 256
 257   const char* get_name() const noexcept override {
 258     return "rgw::auth::s3::AWSAuthStrategy";
 259   }
 260 };
 261
 262
 263 class AWSv4ComplMulti : public rgw::auth::Completer,
 264                         public rgw::io::DecoratedRestfulClient<rgw::io::RestfulClient*>,
 265                         public std::enable_shared_from_this<AWSv4ComplMulti> {
 266   using io_base_t = rgw::io::DecoratedRestfulClient<rgw::io::RestfulClient*>;
 267   using signing_key_t = sha256_digest_t;
 268
 269   CephContext* const cct;
 270
 271   const std::string_view date;
 272   const std::string_view credential_scope;
 273   const signing_key_t signing_key;
 274
 275   class ChunkMeta {
 276     size_t data_offset_in_stream = 0;
 277     size_t data_length = 0;
 278     std::string signature;
 279
 280     ChunkMeta(const size_t data_starts_in_stream,
 281               const size_t data_length,
 282               const std::string_view signature)
 283       : data_offset_in_stream(data_starts_in_stream),
 284         data_length(data_length),
 285         signature(std::string(signature)) {
 286     }
 287
 288     explicit ChunkMeta(const std::string_view& signature)
 289       : signature(std::string(signature)) {
 290     }
 291
 292   public:
 293     static constexpr size_t SIG_SIZE = 64;
 294
 295     /* Let's suppose the data length fields can't exceed uint64_t. */
 296     static constexpr size_t META_MAX_SIZE = \
 297       sarrlen("\r\nffffffffffffffff;chunk-signature=") + SIG_SIZE + sarrlen("\r\n");
 298
 299     /* The metadata size of for the last, empty chunk. */
 300     static constexpr size_t META_MIN_SIZE = \
 301       sarrlen("0;chunk-signature=") + SIG_SIZE + sarrlen("\r\n");
 302
 303     /* Detect whether a given stream_pos fits in boundaries of a chunk. */
 304     bool is_new_chunk_in_stream(size_t stream_pos) const;
 305
 306     /* Get the remaining data size. */
 307     size_t get_data_size(size_t stream_pos) const;
 308
 309     const std::string& get_signature() const {
 310       return signature;
 311     }
 312
 313     /* Factory: create an object representing metadata of first, initial chunk
 314      * in a stream. */
 315     static ChunkMeta create_first(const std::string_view& seed_signature) {
 316       return ChunkMeta(seed_signature);
 317     }
 318
 319     /* Factory: parse a block of META_MAX_SIZE bytes and creates an object
 320      * representing non-first chunk in a stream. As the process is sequential
 321      * and depends on the previous chunk, caller must pass it. */
 322     static std::pair<ChunkMeta, size_t> create_next(CephContext* cct,
 323                                                     ChunkMeta&& prev,
 324                                                     const char* metabuf,
 325                                                     size_t metabuf_len);
 326   } chunk_meta;
 327
 328   size_t stream_pos;
 329   boost::container::static_vector<char, ChunkMeta::META_MAX_SIZE> parsing_buf;
 330   ceph::crypto::SHA256* sha256_hash;
 331   std::string prev_chunk_signature;
 332
 333   bool is_signature_mismatched();
 334   std::string calc_chunk_signature(const std::string& payload_hash) const;
 335
 336 public:
 337   /* We need the constructor to be public because of the std::make_shared that
 338    * is employed by the create() method. */
 339   AWSv4ComplMulti(const req_state* const s,
 340                   std::string_view date,
 341                   std::string_view credential_scope,
 342                   std::string_view seed_signature,
 343                   const signing_key_t& signing_key)
 344     : io_base_t(nullptr),
 345       cct(s->cct),
 346       date(std::move(date)),
 347       credential_scope(std::move(credential_scope)),
 348       signing_key(signing_key),
 349
 350       /* The evolving state. */
 351       chunk_meta(ChunkMeta::create_first(seed_signature)),
 352       stream_pos(0),
 353       sha256_hash(calc_hash_sha256_open_stream()),
 354       prev_chunk_signature(std::move(seed_signature)) {
 355   }
 356
 357   ~AWSv4ComplMulti() {
 358     if (sha256_hash) {
 359       calc_hash_sha256_close_stream(&sha256_hash);
 360     }
 361   }
 362
 363   /* rgw::io::DecoratedRestfulClient. */
 364   size_t recv_body(char* buf, size_t max) override;
 365
 366   /* rgw::auth::Completer. */
 367   void modify_request_state(const DoutPrefixProvider* dpp, req_state* s_rw) override;
 368   bool complete() override;
 369
 370   /* Factories. */
 371   static cmplptr_t create(const req_state* s,
 372                           std::string_view date,
 373                           std::string_view credential_scope,
 374                           std::string_view seed_signature,
 375                           const boost::optional<std::string>& secret_key);
 376
 377 };
 378
 379 class AWSv4ComplSingle : public rgw::auth::Completer,
 380                          public rgw::io::DecoratedRestfulClient<rgw::io::RestfulClient*>,
 381                          public std::enable_shared_from_this<AWSv4ComplSingle> {
 382   using io_base_t = rgw::io::DecoratedRestfulClient<rgw::io::RestfulClient*>;
 383
 384   CephContext* const cct;
 385   const char* const expected_request_payload_hash;
 386   ceph::crypto::SHA256* sha256_hash = nullptr;
 387
 388 public:
 389   /* Defined in rgw_auth_s3.cc because of get_v4_exp_payload_hash(). We need
 390    * the constructor to be public because of the std::make_shared employed by
 391    * the create() method. */
 392   explicit AWSv4ComplSingle(const req_state* const s);
 393
 394   ~AWSv4ComplSingle() {
 395     if (sha256_hash) {
 396       calc_hash_sha256_close_stream(&sha256_hash);
 397     }
 398   }
 399
 400   /* rgw::io::DecoratedRestfulClient. */
 401   size_t recv_body(char* buf, size_t max) override;
 402
 403   /* rgw::auth::Completer. */
 404   void modify_request_state(const DoutPrefixProvider* dpp, req_state* s_rw) override;
 405   bool complete() override;
 406
 407   /* Factories. */
 408   static cmplptr_t create(const req_state* s,
 409                           const boost::optional<std::string>&);
 410
 411 };
 412
 413 } /* namespace s3 */
 414 } /* namespace auth */
 415 } /* namespace rgw */
 416
 417 void rgw_create_s3_canonical_header(
 418   const DoutPrefixProvider *dpp,
 419   const char *method,
 420   const char *content_md5,
 421   const char *content_type,
 422   const char *date,
 423   const meta_map_t& meta_map,
 424   const meta_map_t& qs_map,
 425   const char *request_uri,
 426   const std::map<std::string, std::string>& sub_resources,
 427   std::string& dest_str);
 428 bool rgw_create_s3_canonical_header(const DoutPrefixProvider *dpp,
 429                                     const req_info& info,
 430                                     utime_t *header_time,       /* out */
 431                                     std::string& dest,          /* out */
 432                                     bool qsr);
 433 static inline std::tuple<bool, std::string, utime_t>
 434 rgw_create_s3_canonical_header(const DoutPrefixProvider *dpp, const req_info& info, const bool qsr) {
 435   std::string dest;
 436   utime_t header_time;
 437
 438   const bool ok = rgw_create_s3_canonical_header(dpp, info, &header_time, dest, qsr);
 439   return std::make_tuple(ok, dest, header_time);
 440 }
 441
 442 namespace rgw {
 443 namespace auth {
 444 namespace s3 {
 445
 446 static constexpr char AWS4_HMAC_SHA256_STR[] = "AWS4-HMAC-SHA256";
 447 static constexpr char AWS4_HMAC_SHA256_PAYLOAD_STR[] = "AWS4-HMAC-SHA256-PAYLOAD";
 448
 449 static constexpr char AWS4_EMPTY_PAYLOAD_HASH[] = \
 450   "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
 451
 452 static constexpr char AWS4_UNSIGNED_PAYLOAD_HASH[] = "UNSIGNED-PAYLOAD";
 453
 454 static constexpr char AWS4_STREAMING_PAYLOAD_HASH[] = \
 455   "STREAMING-AWS4-HMAC-SHA256-PAYLOAD";
 456
 457 bool is_non_s3_op(RGWOpType op_type);
 458
 459 int parse_v4_credentials(const req_info& info,                     /* in */
 460                          std::string_view& access_key_id,        /* out */
 461                          std::string_view& credential_scope,     /* out */
 462                          std::string_view& signedheaders,        /* out */
 463                          std::string_view& signature,            /* out */
 464                          std::string_view& date,                 /* out */
 465                          std::string_view& session_token,        /* out */
 466                          const bool using_qs,                    /* in  */
 467                          const DoutPrefixProvider *dpp);         /* in */
 468
 469 string gen_v4_scope(const ceph::real_time& timestamp,
 470                     const string& region,
 471                     const string& service);
 472
 473 static inline bool char_needs_aws4_escaping(const char c, bool encode_slash)
 474 {
 475   if ((c >= 'a' && c <= 'z') ||
 476       (c >= 'A' && c <= 'Z') ||
 477       (c >= '0' && c <= '9')) {
 478     return false;
 479   }
 480
 481   switch (c) {
 482     case '-':
 483     case '_':
 484     case '.':
 485     case '~':
 486       return false;
 487   }
 488
 489   if (c == '/' && !encode_slash)
 490     return false;
 491
 492   return true;
 493 }
 494
 495 static inline std::string aws4_uri_encode(const std::string& src, bool encode_slash)
 496 {
 497   std::string result;
 498
 499   for (const std::string::value_type c : src) {
 500     if (char_needs_aws4_escaping(c, encode_slash)) {
 501       rgw_uri_escape_char(c, result);
 502     } else {
 503       result.push_back(c);
 504     }
 505   }
 506
 507   return result;
 508 }
 509
 510 static inline std::string aws4_uri_recode(const std::string_view& src, bool encode_slash)
 511 {
 512   std::string decoded = url_decode(src);
 513   return aws4_uri_encode(decoded, encode_slash);
 514 }
 515
 516 static inline std::string get_v4_canonical_uri(const req_info& info) {
 517   /* The code should normalize according to RFC 3986 but S3 does NOT do path
 518    * normalization that SigV4 typically does. This code follows the same
 519    * approach that boto library. See auth.py:canonical_uri(...). */
 520
 521   std::string canonical_uri = aws4_uri_recode(info.request_uri_aws4, false);
 522
 523   if (canonical_uri.empty()) {
 524     canonical_uri = "/";
 525   } else {
 526     boost::replace_all(canonical_uri, "+", "%20");
 527   }
 528
 529   return canonical_uri;
 530 }
 531
 532 static inline std::string gen_v4_canonical_uri(const req_info& info) {
 533   /* The code should normalize according to RFC 3986 but S3 does NOT do path
 534    * normalization that SigV4 typically does. This code follows the same
 535    * approach that boto library. See auth.py:canonical_uri(...). */
 536
 537   std::string canonical_uri = aws4_uri_recode(info.request_uri, false);
 538
 539   if (canonical_uri.empty()) {
 540     canonical_uri = "/";
 541   } else {
 542     boost::replace_all(canonical_uri, "+", "%20");
 543   }
 544
 545   return canonical_uri;
 546 }
 547
 548 static inline const string calc_v4_payload_hash(const string& payload)
 549 {
 550   ceph::crypto::SHA256* sha256_hash = calc_hash_sha256_open_stream();
 551   calc_hash_sha256_update_stream(sha256_hash, payload.c_str(), payload.length());
 552   const auto payload_hash = calc_hash_sha256_close_stream(&sha256_hash);
 553   return payload_hash;
 554 }
 555
 556 static inline const char* get_v4_exp_payload_hash(const req_info& info)
 557 {
 558   /* In AWSv4 the hash of real, transferred payload IS NOT necessary to form
 559    * a Canonical Request, and thus verify a Signature. x-amz-content-sha256
 560    * header lets get the information very early -- before seeing first byte
 561    * of HTTP body. As a consequence, we can decouple Signature verification
 562    * from payload's fingerprint check. */
 563   const char *expected_request_payload_hash = \
 564     info.env->get("HTTP_X_AMZ_CONTENT_SHA256");
 565
 566   if (!expected_request_payload_hash) {
 567     /* An HTTP client MUST send x-amz-content-sha256. The single exception
 568      * is the case of using the Query Parameters where "UNSIGNED-PAYLOAD"
 569      * literals are used for crafting Canonical Request:
 570      *
 571      *  You don't include a payload hash in the Canonical Request, because
 572      *  when you create a presigned URL, you don't know the payload content
 573      *  because the URL is used to upload an arbitrary payload. Instead, you
 574      *  use a constant string UNSIGNED-PAYLOAD. */
 575     expected_request_payload_hash = AWS4_UNSIGNED_PAYLOAD_HASH;
 576   }
 577
 578   return expected_request_payload_hash;
 579 }
 580
 581 static inline bool is_v4_payload_unsigned(const char* const exp_payload_hash)
 582 {
 583   return boost::equals(exp_payload_hash, AWS4_UNSIGNED_PAYLOAD_HASH);
 584 }
 585
 586 static inline bool is_v4_payload_empty(const req_state* const s)
 587 {
 588   /* from rfc2616 - 4.3 Message Body
 589    *
 590    * "The presence of a message-body in a request is signaled by the inclusion
 591    * of a Content-Length or Transfer-Encoding header field in the request's
 592    * message-headers." */
 593   return s->content_length == 0 &&
 594          s->info.env->get("HTTP_TRANSFER_ENCODING") == nullptr;
 595 }
 596
 597 static inline bool is_v4_payload_streamed(const char* const exp_payload_hash)
 598 {
 599   return boost::equals(exp_payload_hash, AWS4_STREAMING_PAYLOAD_HASH);
 600 }
 601
 602 std::string get_v4_canonical_qs(const req_info& info, bool using_qs);
 603
 604 std::string gen_v4_canonical_qs(const req_info& info);
 605
 606 boost::optional<std::string>
 607 get_v4_canonical_headers(const req_info& info,
 608                          const std::string_view& signedheaders,
 609                          bool using_qs,
 610                          bool force_boto2_compat);
 611
 612 std::string gen_v4_canonical_headers(const req_info& info,
 613                                      const std::map<std::string, std::string>& extra_headers,
 614                                      string *signed_hdrs);
 615
 616 extern sha256_digest_t
 617 get_v4_canon_req_hash(CephContext* cct,
 618                       const std::string_view& http_verb,
 619                       const std::string& canonical_uri,
 620                       const std::string& canonical_qs,
 621                       const std::string& canonical_hdrs,
 622                       const std::string_view& signed_hdrs,
 623                       const std::string_view& request_payload_hash,
 624                       const DoutPrefixProvider *dpp);
 625
 626 AWSEngine::VersionAbstractor::string_to_sign_t
 627 get_v4_string_to_sign(CephContext* cct,
 628                       const std::string_view& algorithm,
 629                       const std::string_view& request_date,
 630                       const std::string_view& credential_scope,
 631                       const sha256_digest_t& canonreq_hash,
 632                       const DoutPrefixProvider *dpp);
 633
 634 extern AWSEngine::VersionAbstractor::server_signature_t
 635 get_v4_signature(const std::string_view& credential_scope,
 636                  CephContext* const cct,
 637                  const std::string_view& secret_key,
 638                  const AWSEngine::VersionAbstractor::string_to_sign_t& string_to_sign,
 639                  const DoutPrefixProvider *dpp);
 640
 641 extern AWSEngine::VersionAbstractor::server_signature_t
 642 get_v2_signature(CephContext*,
 643                  const std::string& secret_key,
 644                  const AWSEngine::VersionAbstractor::string_to_sign_t& string_to_sign);
 645 } /* namespace s3 */
 646 } /* namespace auth */
 647 } /* namespace rgw */
 648
 649 #endif