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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
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_common.h" | |
13 | #include "rgw_auth.h" | |
14 | ||
15 | namespace rgw { | |
16 | namespace auth { | |
17 | ||
18 | /* Abstract decorator over any implementation of rgw::auth::IdentityApplier | |
19 | * which could be provided both as a pointer-to-object or the object itself. */ | |
20 | template <typename DecorateeT> | |
21 | class DecoratedApplier : public rgw::auth::IdentityApplier { | |
22 | typedef typename std::remove_pointer<DecorateeT>::type DerefedDecorateeT; | |
23 | ||
24 | static_assert(std::is_base_of<rgw::auth::IdentityApplier, | |
25 | DerefedDecorateeT>::value, | |
26 | "DecorateeT must be a subclass of rgw::auth::IdentityApplier"); | |
27 | ||
28 | DecorateeT decoratee; | |
29 | ||
30 | /* There is an indirection layer over accessing decoratee to share the same | |
31 | * code base between dynamic and static decorators. The difference is about | |
32 | * what we store internally: pointer to a decorated object versus the whole | |
33 | * object itself. Googling for "SFINAE" can help to understand the code. */ | |
34 | template <typename T = void, | |
35 | typename std::enable_if< | |
36 | std::is_pointer<DecorateeT>::value, T>::type* = nullptr> | |
37 | DerefedDecorateeT& get_decoratee() { | |
38 | return *decoratee; | |
39 | } | |
40 | ||
41 | template <typename T = void, | |
42 | typename std::enable_if< | |
43 | ! std::is_pointer<DecorateeT>::value, T>::type* = nullptr> | |
44 | DerefedDecorateeT& get_decoratee() { | |
45 | return decoratee; | |
46 | } | |
47 | ||
48 | template <typename T = void, | |
49 | typename std::enable_if< | |
50 | std::is_pointer<DecorateeT>::value, T>::type* = nullptr> | |
51 | const DerefedDecorateeT& get_decoratee() const { | |
52 | return *decoratee; | |
53 | } | |
54 | ||
55 | template <typename T = void, | |
56 | typename std::enable_if< | |
57 | ! std::is_pointer<DecorateeT>::value, T>::type* = nullptr> | |
58 | const DerefedDecorateeT& get_decoratee() const { | |
59 | return decoratee; | |
60 | } | |
61 | ||
62 | public: | |
63 | DecoratedApplier(DecorateeT&& decoratee) | |
64 | : decoratee(std::forward<DecorateeT>(decoratee)) { | |
65 | } | |
66 | ||
67 | uint32_t get_perms_from_aclspec(const aclspec_t& aclspec) const override { | |
68 | return get_decoratee().get_perms_from_aclspec(aclspec); | |
69 | } | |
70 | ||
71 | bool is_admin_of(const rgw_user& uid) const override { | |
72 | return get_decoratee().is_admin_of(uid); | |
73 | } | |
74 | ||
75 | bool is_owner_of(const rgw_user& uid) const override { | |
76 | return get_decoratee().is_owner_of(uid); | |
77 | } | |
78 | ||
79 | uint32_t get_perm_mask() const override { | |
80 | return get_decoratee().get_perm_mask(); | |
81 | } | |
82 | ||
83 | void to_str(std::ostream& out) const override { | |
84 | get_decoratee().to_str(out); | |
85 | } | |
86 | ||
87 | void load_acct_info(RGWUserInfo& user_info) const override { /* out */ | |
88 | return get_decoratee().load_acct_info(user_info); | |
89 | } | |
90 | ||
91 | void modify_request_state(req_state * s) const override { /* in/out */ | |
92 | return get_decoratee().modify_request_state(s); | |
93 | } | |
94 | }; | |
95 | ||
96 | ||
97 | template <typename T> | |
98 | class ThirdPartyAccountApplier : public DecoratedApplier<T> { | |
99 | /* const */RGWRados* const store; | |
100 | const rgw_user acct_user_override; | |
101 | ||
102 | public: | |
103 | /* A value representing situations where there is no requested account | |
104 | * override. In other words, acct_user_override will be equal to this | |
105 | * constant where the request isn't a cross-tenant one. */ | |
106 | static const rgw_user UNKNOWN_ACCT; | |
107 | ||
108 | template <typename U> | |
109 | ThirdPartyAccountApplier(RGWRados* const store, | |
110 | const rgw_user acct_user_override, | |
111 | U&& decoratee) | |
112 | : DecoratedApplier<T>(std::move(decoratee)), | |
113 | store(store), | |
114 | acct_user_override(acct_user_override) { | |
115 | } | |
116 | ||
117 | void to_str(std::ostream& out) const override; | |
118 | void load_acct_info(RGWUserInfo& user_info) const override; /* out */ | |
119 | }; | |
120 | ||
121 | /* static declaration: UNKNOWN_ACCT will be an empty rgw_user that is a result | |
122 | * of the default construction. */ | |
123 | template <typename T> | |
124 | const rgw_user ThirdPartyAccountApplier<T>::UNKNOWN_ACCT; | |
125 | ||
126 | template <typename T> | |
127 | void ThirdPartyAccountApplier<T>::to_str(std::ostream& out) const | |
128 | { | |
129 | out << "rgw::auth::ThirdPartyAccountApplier(" + acct_user_override.to_str() + ")" | |
130 | << " -> "; | |
131 | DecoratedApplier<T>::to_str(out); | |
132 | } | |
133 | ||
134 | template <typename T> | |
135 | void ThirdPartyAccountApplier<T>::load_acct_info(RGWUserInfo& user_info) const | |
136 | { | |
137 | if (UNKNOWN_ACCT == acct_user_override) { | |
138 | /* There is no override specified by the upper layer. This means that we'll | |
139 | * load the account owned by the authenticated identity (aka auth_user). */ | |
140 | DecoratedApplier<T>::load_acct_info(user_info); | |
141 | } else if (DecoratedApplier<T>::is_owner_of(acct_user_override)) { | |
142 | /* The override has been specified but the account belongs to the authenticated | |
143 | * identity. We may safely forward the call to a next stage. */ | |
144 | DecoratedApplier<T>::load_acct_info(user_info); | |
145 | } else { | |
146 | /* Compatibility mechanism for multi-tenancy. For more details refer to | |
147 | * load_acct_info method of rgw::auth::RemoteApplier. */ | |
148 | if (acct_user_override.tenant.empty()) { | |
149 | const rgw_user tenanted_uid(acct_user_override.id, acct_user_override.id); | |
150 | ||
151 | if (rgw_get_user_info_by_uid(store, tenanted_uid, user_info) >= 0) { | |
152 | /* Succeeded. */ | |
153 | return; | |
154 | } | |
155 | } | |
156 | ||
157 | const int ret = rgw_get_user_info_by_uid(store, acct_user_override, user_info); | |
158 | if (ret < 0) { | |
159 | /* We aren't trying to recover from ENOENT here. It's supposed that creating | |
160 | * someone else's account isn't a thing we want to support in this filter. */ | |
161 | if (ret == -ENOENT) { | |
162 | throw -EACCES; | |
163 | } else { | |
164 | throw ret; | |
165 | } | |
166 | } | |
167 | ||
168 | } | |
169 | } | |
170 | ||
171 | template <typename T> static inline | |
172 | ThirdPartyAccountApplier<T> add_3rdparty(RGWRados* const store, | |
173 | const rgw_user acct_user_override, | |
174 | T&& t) { | |
175 | return ThirdPartyAccountApplier<T>(store, acct_user_override, | |
176 | std::forward<T>(t)); | |
177 | } | |
178 | ||
179 | ||
180 | template <typename T> | |
181 | class SysReqApplier : public DecoratedApplier<T> { | |
182 | CephContext* const cct; | |
183 | /*const*/ RGWRados* const store; | |
184 | const RGWHTTPArgs& args; | |
185 | mutable boost::tribool is_system; | |
186 | ||
187 | public: | |
188 | template <typename U> | |
189 | SysReqApplier(CephContext* const cct, | |
190 | /*const*/ RGWRados* const store, | |
191 | const req_state* const s, | |
192 | U&& decoratee) | |
193 | : DecoratedApplier<T>(std::forward<T>(decoratee)), | |
194 | cct(cct), | |
195 | store(store), | |
196 | args(s->info.args), | |
197 | is_system(boost::logic::indeterminate) { | |
198 | } | |
199 | ||
200 | void to_str(std::ostream& out) const override; | |
201 | void load_acct_info(RGWUserInfo& user_info) const override; /* out */ | |
202 | void modify_request_state(req_state* s) const override; /* in/out */ | |
203 | }; | |
204 | ||
205 | template <typename T> | |
206 | void SysReqApplier<T>::to_str(std::ostream& out) const | |
207 | { | |
208 | out << "rgw::auth::SysReqApplier" << " -> "; | |
209 | DecoratedApplier<T>::to_str(out); | |
210 | } | |
211 | ||
212 | template <typename T> | |
213 | void SysReqApplier<T>::load_acct_info(RGWUserInfo& user_info) const | |
214 | { | |
215 | DecoratedApplier<T>::load_acct_info(user_info); | |
216 | is_system = user_info.system; | |
217 | ||
218 | if (is_system) { | |
219 | //dout(20) << "system request" << dendl; | |
220 | ||
221 | rgw_user effective_uid(args.sys_get(RGW_SYS_PARAM_PREFIX "uid")); | |
222 | if (! effective_uid.empty()) { | |
223 | /* We aren't writing directly to user_info for consistency and security | |
224 | * reasons. rgw_get_user_info_by_uid doesn't trigger the operator=() but | |
225 | * calls ::decode instead. */ | |
226 | RGWUserInfo euser_info; | |
227 | if (rgw_get_user_info_by_uid(store, effective_uid, euser_info) < 0) { | |
228 | //ldout(s->cct, 0) << "User lookup failed!" << dendl; | |
229 | throw -EACCES; | |
230 | } | |
231 | user_info = euser_info; | |
232 | } | |
233 | } | |
234 | } | |
235 | ||
236 | template <typename T> | |
237 | void SysReqApplier<T>::modify_request_state(req_state* const s) const | |
238 | { | |
239 | if (boost::logic::indeterminate(is_system)) { | |
240 | RGWUserInfo unused_info; | |
241 | load_acct_info(unused_info); | |
242 | } | |
243 | ||
244 | if (is_system) { | |
245 | s->info.args.set_system(); | |
246 | s->system_request = true; | |
247 | } | |
248 | } | |
249 | ||
250 | template <typename T> static inline | |
251 | SysReqApplier<T> add_sysreq(CephContext* const cct, | |
252 | /* const */ RGWRados* const store, | |
253 | const req_state* const s, | |
254 | T&& t) { | |
255 | return SysReqApplier<T>(cct, store, s, std::forward<T>(t)); | |
256 | } | |
257 | ||
258 | } /* namespace auth */ | |
259 | } /* namespace rgw */ | |
260 | ||
261 | #endif /* CEPH_RGW_AUTH_FILTERS_H */ |