ceph/src/rgw/rgw_auth_filters.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_FILTERS_H
   5 #define CEPH_RGW_AUTH_FILTERS_H
   6
   7 #include <type_traits>
   8
   9 #include <boost/logic/tribool.hpp>
  10 #include <boost/optional.hpp>
  11
  12 #include "rgw_service.h"
  13 #include "rgw_common.h"
  14 #include "rgw_auth.h"
  15 #include "rgw_user.h"
  16
  17 namespace rgw {
  18 namespace auth {
  19
  20 /* Abstract decorator over any implementation of rgw::auth::IdentityApplier
  21  * which could be provided both as a pointer-to-object or the object itself. */
  22 template <typename DecorateeT>
  23 class DecoratedApplier : public rgw::auth::IdentityApplier {
  24   typedef typename std::remove_pointer<DecorateeT>::type DerefedDecorateeT;
  25
  26   static_assert(std::is_base_of<rgw::auth::IdentityApplier,
  27                                 DerefedDecorateeT>::value,
  28                 "DecorateeT must be a subclass of rgw::auth::IdentityApplier");
  29
  30   DecorateeT decoratee;
  31
  32   /* There is an indirection layer over accessing decoratee to share the same
  33    * code base between dynamic and static decorators. The difference is about
  34    * what we store internally: pointer to a decorated object versus the whole
  35    * object itself. Googling for "SFINAE" can help to understand the code. */
  36   template <typename T = void,
  37             typename std::enable_if<
  38     std::is_pointer<DecorateeT>::value, T>::type* = nullptr>
  39   DerefedDecorateeT& get_decoratee() {
  40     return *decoratee;
  41   }
  42
  43   template <typename T = void,
  44             typename std::enable_if<
  45     ! std::is_pointer<DecorateeT>::value, T>::type* = nullptr>
  46   DerefedDecorateeT& get_decoratee() {
  47     return decoratee;
  48   }
  49
  50   template <typename T = void,
  51             typename std::enable_if<
  52     std::is_pointer<DecorateeT>::value, T>::type* = nullptr>
  53   const DerefedDecorateeT& get_decoratee() const {
  54     return *decoratee;
  55   }
  56
  57   template <typename T = void,
  58             typename std::enable_if<
  59     ! std::is_pointer<DecorateeT>::value, T>::type* = nullptr>
  60   const DerefedDecorateeT& get_decoratee() const {
  61     return decoratee;
  62   }
  63
  64 public:
  65   explicit DecoratedApplier(DecorateeT&& decoratee)
  66     : decoratee(std::forward<DecorateeT>(decoratee)) {
  67   }
  68
  69   uint32_t get_perms_from_aclspec(const DoutPrefixProvider* dpp, const aclspec_t& aclspec) const override {
  70     return get_decoratee().get_perms_from_aclspec(dpp, aclspec);
  71   }
  72
  73   bool is_admin_of(const rgw_user& uid) const override {
  74     return get_decoratee().is_admin_of(uid);
  75   }
  76
  77   bool is_owner_of(const rgw_user& uid) const override {
  78     return get_decoratee().is_owner_of(uid);
  79   }
  80
  81   bool is_anonymous() const override {
  82     return get_decoratee().is_anonymous();
  83   }
  84
  85   uint32_t get_perm_mask() const override {
  86     return get_decoratee().get_perm_mask();
  87   }
  88
  89   uint32_t get_identity_type() const override {
  90     return get_decoratee().get_identity_type();
  91   }
  92
  93   std::string get_acct_name() const override {
  94     return get_decoratee().get_acct_name();
  95   }
  96
  97   std::string get_subuser() const override {
  98     return get_decoratee().get_subuser();
  99   }
 100
 101   bool is_identity(
 102     const boost::container::flat_set<Principal>& ids) const override {
 103     return get_decoratee().is_identity(ids);
 104   }
 105
 106   void to_str(std::ostream& out) const override {
 107     get_decoratee().to_str(out);
 108   }
 109
 110   std::string get_role_tenant() const override {     /* in/out */
 111     return get_decoratee().get_role_tenant();
 112   }
 113
 114   void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override {  /* out */
 115     return get_decoratee().load_acct_info(dpp, user_info);
 116   }
 117
 118   void modify_request_state(const DoutPrefixProvider* dpp, req_state * s) const override {     /* in/out */
 119     return get_decoratee().modify_request_state(dpp, s);
 120   }
 121 };
 122
 123
 124 template <typename T>
 125 class ThirdPartyAccountApplier : public DecoratedApplier<T> {
 126   rgw::sal::Store* store;
 127   const rgw_user acct_user_override;
 128
 129 public:
 130   /* A value representing situations where there is no requested account
 131    * override. In other words, acct_user_override will be equal to this
 132    * constant where the request isn't a cross-tenant one. */
 133   static const rgw_user UNKNOWN_ACCT;
 134
 135   template <typename U>
 136   ThirdPartyAccountApplier(rgw::sal::Store* store,
 137                            const rgw_user &acct_user_override,
 138                            U&& decoratee)
 139     : DecoratedApplier<T>(std::move(decoratee)),
 140       store(store),
 141       acct_user_override(acct_user_override) {
 142   }
 143
 144   void to_str(std::ostream& out) const override;
 145   void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override;   /* out */
 146 };
 147
 148 /* static declaration: UNKNOWN_ACCT will be an empty rgw_user that is a result
 149  * of the default construction. */
 150 template <typename T>
 151 const rgw_user ThirdPartyAccountApplier<T>::UNKNOWN_ACCT;
 152
 153 template <typename T>
 154 void ThirdPartyAccountApplier<T>::to_str(std::ostream& out) const
 155 {
 156   out << "rgw::auth::ThirdPartyAccountApplier(" + acct_user_override.to_str() + ")"
 157       <<   " -> ";
 158   DecoratedApplier<T>::to_str(out);
 159 }
 160
 161 template <typename T>
 162 void ThirdPartyAccountApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const
 163 {
 164   if (UNKNOWN_ACCT == acct_user_override) {
 165     /* There is no override specified by the upper layer. This means that we'll
 166      * load the account owned by the authenticated identity (aka auth_user). */
 167     DecoratedApplier<T>::load_acct_info(dpp, user_info);
 168   } else if (DecoratedApplier<T>::is_owner_of(acct_user_override)) {
 169     /* The override has been specified but the account belongs to the authenticated
 170      * identity. We may safely forward the call to a next stage. */
 171     DecoratedApplier<T>::load_acct_info(dpp, user_info);
 172   } else if (this->is_anonymous()) {
 173     /* If the user was authed by the anonymous engine then scope the ANON user
 174      * to the correct tenant */
 175     if (acct_user_override.tenant.empty())
 176       user_info.user_id = rgw_user(acct_user_override.id, RGW_USER_ANON_ID);
 177     else
 178       user_info.user_id = rgw_user(acct_user_override.tenant, RGW_USER_ANON_ID);
 179   } else {
 180     /* Compatibility mechanism for multi-tenancy. For more details refer to
 181      * load_acct_info method of rgw::auth::RemoteApplier. */
 182     std::unique_ptr<rgw::sal::User> user;
 183
 184     if (acct_user_override.tenant.empty()) {
 185       const rgw_user tenanted_uid(acct_user_override.id, acct_user_override.id);
 186       user = store->get_user(tenanted_uid);
 187
 188       if (user->load_user(dpp, null_yield) >= 0) {
 189         user_info = user->get_info();
 190         /* Succeeded. */
 191         return;
 192       }
 193     }
 194
 195     user = store->get_user(acct_user_override);
 196     const int ret = user->load_user(dpp, null_yield);
 197     if (ret < 0) {
 198       /* We aren't trying to recover from ENOENT here. It's supposed that creating
 199        * someone else's account isn't a thing we want to support in this filter. */
 200       if (ret == -ENOENT) {
 201         throw -EACCES;
 202       } else {
 203         throw ret;
 204       }
 205     }
 206     user_info = user->get_info();
 207   }
 208 }
 209
 210 template <typename T> static inline
 211 ThirdPartyAccountApplier<T> add_3rdparty(rgw::sal::Store* store,
 212                                          const rgw_user &acct_user_override,
 213                                          T&& t) {
 214   return ThirdPartyAccountApplier<T>(store, acct_user_override,
 215                                      std::forward<T>(t));
 216 }
 217
 218
 219 template <typename T>
 220 class SysReqApplier : public DecoratedApplier<T> {
 221   CephContext* const cct;
 222   rgw::sal::Store* store;
 223   const RGWHTTPArgs& args;
 224   mutable boost::tribool is_system;
 225
 226 public:
 227   template <typename U>
 228   SysReqApplier(CephContext* const cct,
 229                 rgw::sal::Store* store,
 230                 const req_state* const s,
 231                 U&& decoratee)
 232     : DecoratedApplier<T>(std::forward<T>(decoratee)),
 233       cct(cct),
 234       store(store),
 235       args(s->info.args),
 236       is_system(boost::logic::indeterminate) {
 237   }
 238
 239   void to_str(std::ostream& out) const override;
 240   void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override;   /* out */
 241   void modify_request_state(const DoutPrefixProvider* dpp, req_state* s) const override;       /* in/out */
 242 };
 243
 244 template <typename T>
 245 void SysReqApplier<T>::to_str(std::ostream& out) const
 246 {
 247   out << "rgw::auth::SysReqApplier" << " -> ";
 248   DecoratedApplier<T>::to_str(out);
 249 }
 250
 251 template <typename T>
 252 void SysReqApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const
 253 {
 254   DecoratedApplier<T>::load_acct_info(dpp, user_info);
 255   is_system = user_info.system;
 256
 257   if (is_system) {
 258     //ldpp_dout(dpp, 20) << "system request" << dendl;
 259
 260     rgw_user effective_uid(args.sys_get(RGW_SYS_PARAM_PREFIX "uid"));
 261     if (! effective_uid.empty()) {
 262       /* We aren't writing directly to user_info for consistency and security
 263        * reasons. rgw_get_user_info_by_uid doesn't trigger the operator=() but
 264        * calls ::decode instead. */
 265       std::unique_ptr<rgw::sal::User> user = store->get_user(effective_uid);
 266       if (user->load_user(dpp, null_yield) < 0) {
 267         //ldpp_dout(dpp, 0) << "User lookup failed!" << dendl;
 268         throw -EACCES;
 269       }
 270       user_info = user->get_info();
 271     }
 272   }
 273 }
 274
 275 template <typename T>
 276 void SysReqApplier<T>::modify_request_state(const DoutPrefixProvider* dpp, req_state* const s) const
 277 {
 278   if (boost::logic::indeterminate(is_system)) {
 279     RGWUserInfo unused_info;
 280     load_acct_info(dpp, unused_info);
 281   }
 282
 283   if (is_system) {
 284     s->info.args.set_system();
 285     s->system_request = true;
 286   }
 287   DecoratedApplier<T>::modify_request_state(dpp, s);
 288 }
 289
 290 template <typename T> static inline
 291 SysReqApplier<T> add_sysreq(CephContext* const cct,
 292                             rgw::sal::Store* store,
 293                             const req_state* const s,
 294                             T&& t) {
 295   return SysReqApplier<T>(cct, store, s, std::forward<T>(t));
 296 }
 297
 298 } /* namespace auth */
 299 } /* namespace rgw */
 300
 301 #endif /* CEPH_RGW_AUTH_FILTERS_H */