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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 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_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 | explicit DecoratedApplier(DecorateeT&& decoratee) | |
64 | : decoratee(std::forward<DecorateeT>(decoratee)) { | |
65 | } | |
66 | ||
67 | uint32_t get_perms_from_aclspec(const DoutPrefixProvider* dpp, const aclspec_t& aclspec) const override { | |
68 | return get_decoratee().get_perms_from_aclspec(dpp, 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 | uint32_t get_identity_type() const override { | |
84 | return get_decoratee().get_identity_type(); | |
85 | } | |
86 | ||
87 | string get_acct_name() const override { | |
88 | return get_decoratee().get_acct_name(); | |
89 | } | |
90 | ||
91 | bool is_identity( | |
92 | const boost::container::flat_set<Principal>& ids) const override { | |
93 | return get_decoratee().is_identity(ids); | |
94 | } | |
95 | ||
96 | void to_str(std::ostream& out) const override { | |
97 | get_decoratee().to_str(out); | |
98 | } | |
99 | ||
100 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override { /* out */ | |
101 | return get_decoratee().load_acct_info(dpp, user_info); | |
102 | } | |
103 | ||
104 | void modify_request_state(const DoutPrefixProvider* dpp, req_state * s) const override { /* in/out */ | |
105 | return get_decoratee().modify_request_state(dpp, s); | |
106 | } | |
107 | }; | |
108 | ||
109 | ||
110 | template <typename T> | |
111 | class ThirdPartyAccountApplier : public DecoratedApplier<T> { | |
112 | /* const */RGWCtl* const ctl; | |
113 | const rgw_user acct_user_override; | |
114 | ||
115 | public: | |
116 | /* A value representing situations where there is no requested account | |
117 | * override. In other words, acct_user_override will be equal to this | |
118 | * constant where the request isn't a cross-tenant one. */ | |
119 | static const rgw_user UNKNOWN_ACCT; | |
120 | ||
121 | template <typename U> | |
122 | ThirdPartyAccountApplier(RGWCtl* const ctl, | |
123 | const rgw_user &acct_user_override, | |
124 | U&& decoratee) | |
125 | : DecoratedApplier<T>(std::move(decoratee)), | |
126 | ctl(ctl), | |
127 | acct_user_override(acct_user_override) { | |
128 | } | |
129 | ||
130 | void to_str(std::ostream& out) const override; | |
131 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override; /* out */ | |
132 | }; | |
133 | ||
134 | /* static declaration: UNKNOWN_ACCT will be an empty rgw_user that is a result | |
135 | * of the default construction. */ | |
136 | template <typename T> | |
137 | const rgw_user ThirdPartyAccountApplier<T>::UNKNOWN_ACCT; | |
138 | ||
139 | template <typename T> | |
140 | void ThirdPartyAccountApplier<T>::to_str(std::ostream& out) const | |
141 | { | |
142 | out << "rgw::auth::ThirdPartyAccountApplier(" + acct_user_override.to_str() + ")" | |
143 | << " -> "; | |
144 | DecoratedApplier<T>::to_str(out); | |
145 | } | |
146 | ||
147 | template <typename T> | |
148 | void ThirdPartyAccountApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const | |
149 | { | |
150 | if (UNKNOWN_ACCT == acct_user_override) { | |
151 | /* There is no override specified by the upper layer. This means that we'll | |
152 | * load the account owned by the authenticated identity (aka auth_user). */ | |
153 | DecoratedApplier<T>::load_acct_info(dpp, user_info); | |
154 | } else if (DecoratedApplier<T>::is_owner_of(acct_user_override)) { | |
155 | /* The override has been specified but the account belongs to the authenticated | |
156 | * identity. We may safely forward the call to a next stage. */ | |
157 | DecoratedApplier<T>::load_acct_info(dpp, user_info); | |
158 | } else { | |
159 | /* Compatibility mechanism for multi-tenancy. For more details refer to | |
160 | * load_acct_info method of rgw::auth::RemoteApplier. */ | |
161 | if (acct_user_override.tenant.empty()) { | |
162 | const rgw_user tenanted_uid(acct_user_override.id, acct_user_override.id); | |
163 | ||
164 | if (ctl->user->get_info_by_uid(tenanted_uid, &user_info, null_yield) >= 0) { | |
165 | /* Succeeded. */ | |
166 | return; | |
167 | } | |
168 | } | |
169 | ||
170 | const int ret = ctl->user->get_info_by_uid(acct_user_override, &user_info, null_yield); | |
171 | if (ret < 0) { | |
172 | /* We aren't trying to recover from ENOENT here. It's supposed that creating | |
173 | * someone else's account isn't a thing we want to support in this filter. */ | |
174 | if (ret == -ENOENT) { | |
175 | throw -EACCES; | |
176 | } else { | |
177 | throw ret; | |
178 | } | |
179 | } | |
180 | ||
181 | } | |
182 | } | |
183 | ||
184 | template <typename T> static inline | |
185 | ThirdPartyAccountApplier<T> add_3rdparty(RGWCtl* const ctl, | |
186 | const rgw_user &acct_user_override, | |
187 | T&& t) { | |
188 | return ThirdPartyAccountApplier<T>(ctl, acct_user_override, | |
189 | std::forward<T>(t)); | |
190 | } | |
191 | ||
192 | ||
193 | template <typename T> | |
194 | class SysReqApplier : public DecoratedApplier<T> { | |
195 | CephContext* const cct; | |
196 | /*const*/ RGWCtl* const ctl; | |
197 | const RGWHTTPArgs& args; | |
198 | mutable boost::tribool is_system; | |
199 | ||
200 | public: | |
201 | template <typename U> | |
202 | SysReqApplier(CephContext* const cct, | |
203 | /*const*/ RGWCtl* const ctl, | |
204 | const req_state* const s, | |
205 | U&& decoratee) | |
206 | : DecoratedApplier<T>(std::forward<T>(decoratee)), | |
207 | cct(cct), | |
208 | ctl(ctl), | |
209 | args(s->info.args), | |
210 | is_system(boost::logic::indeterminate) { | |
211 | } | |
212 | ||
213 | void to_str(std::ostream& out) const override; | |
214 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override; /* out */ | |
215 | void modify_request_state(const DoutPrefixProvider* dpp, req_state* s) const override; /* in/out */ | |
216 | }; | |
217 | ||
218 | template <typename T> | |
219 | void SysReqApplier<T>::to_str(std::ostream& out) const | |
220 | { | |
221 | out << "rgw::auth::SysReqApplier" << " -> "; | |
222 | DecoratedApplier<T>::to_str(out); | |
223 | } | |
224 | ||
225 | template <typename T> | |
226 | void SysReqApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const | |
227 | { | |
228 | DecoratedApplier<T>::load_acct_info(dpp, user_info); | |
229 | is_system = user_info.system; | |
230 | ||
231 | if (is_system) { | |
232 | //ldpp_dout(dpp, 20) << "system request" << dendl; | |
233 | ||
234 | rgw_user effective_uid(args.sys_get(RGW_SYS_PARAM_PREFIX "uid")); | |
235 | if (! effective_uid.empty()) { | |
236 | /* We aren't writing directly to user_info for consistency and security | |
237 | * reasons. rgw_get_user_info_by_uid doesn't trigger the operator=() but | |
238 | * calls ::decode instead. */ | |
239 | RGWUserInfo euser_info; | |
240 | if (ctl->user->get_info_by_uid(effective_uid, &euser_info, null_yield) < 0) { | |
241 | //ldpp_dout(dpp, 0) << "User lookup failed!" << dendl; | |
242 | throw -EACCES; | |
243 | } | |
244 | user_info = euser_info; | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
249 | template <typename T> | |
250 | void SysReqApplier<T>::modify_request_state(const DoutPrefixProvider* dpp, req_state* const s) const | |
251 | { | |
252 | if (boost::logic::indeterminate(is_system)) { | |
253 | RGWUserInfo unused_info; | |
254 | load_acct_info(dpp, unused_info); | |
255 | } | |
256 | ||
257 | if (is_system) { | |
258 | s->info.args.set_system(); | |
259 | s->system_request = true; | |
260 | } | |
261 | DecoratedApplier<T>::modify_request_state(dpp, s); | |
262 | } | |
263 | ||
264 | template <typename T> static inline | |
265 | SysReqApplier<T> add_sysreq(CephContext* const cct, | |
266 | /* const */ RGWCtl* const ctl, | |
267 | const req_state* const s, | |
268 | T&& t) { | |
269 | return SysReqApplier<T>(cct, ctl, s, std::forward<T>(t)); | |
270 | } | |
271 | ||
272 | } /* namespace auth */ | |
273 | } /* namespace rgw */ | |
274 | ||
275 | #endif /* CEPH_RGW_AUTH_FILTERS_H */ |