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7c673cae | 1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
9f95a23c | 2 | // vim: ts=8 sw=2 smarttab ft=cpp |
7c673cae FG |
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: | |
11fdf7f2 | 63 | explicit DecoratedApplier(DecorateeT&& decoratee) |
7c673cae FG |
64 | : decoratee(std::forward<DecorateeT>(decoratee)) { |
65 | } | |
66 | ||
11fdf7f2 TL |
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); | |
7c673cae FG |
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 | ||
f91f0fd5 TL |
79 | bool is_anonymous() const override { |
80 | return get_decoratee().is_anonymous(); | |
81 | } | |
82 | ||
7c673cae FG |
83 | uint32_t get_perm_mask() const override { |
84 | return get_decoratee().get_perm_mask(); | |
85 | } | |
86 | ||
11fdf7f2 TL |
87 | uint32_t get_identity_type() const override { |
88 | return get_decoratee().get_identity_type(); | |
89 | } | |
90 | ||
91 | string get_acct_name() const override { | |
92 | return get_decoratee().get_acct_name(); | |
93 | } | |
94 | ||
f6b5b4d7 TL |
95 | string get_subuser() const override { |
96 | return get_decoratee().get_subuser(); | |
97 | } | |
98 | ||
31f18b77 FG |
99 | bool is_identity( |
100 | const boost::container::flat_set<Principal>& ids) const override { | |
101 | return get_decoratee().is_identity(ids); | |
102 | } | |
103 | ||
7c673cae FG |
104 | void to_str(std::ostream& out) const override { |
105 | get_decoratee().to_str(out); | |
106 | } | |
107 | ||
11fdf7f2 TL |
108 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override { /* out */ |
109 | return get_decoratee().load_acct_info(dpp, user_info); | |
7c673cae FG |
110 | } |
111 | ||
11fdf7f2 TL |
112 | void modify_request_state(const DoutPrefixProvider* dpp, req_state * s) const override { /* in/out */ |
113 | return get_decoratee().modify_request_state(dpp, s); | |
7c673cae FG |
114 | } |
115 | }; | |
116 | ||
117 | ||
118 | template <typename T> | |
119 | class ThirdPartyAccountApplier : public DecoratedApplier<T> { | |
9f95a23c | 120 | /* const */RGWCtl* const ctl; |
7c673cae FG |
121 | const rgw_user acct_user_override; |
122 | ||
123 | public: | |
124 | /* A value representing situations where there is no requested account | |
125 | * override. In other words, acct_user_override will be equal to this | |
126 | * constant where the request isn't a cross-tenant one. */ | |
127 | static const rgw_user UNKNOWN_ACCT; | |
128 | ||
129 | template <typename U> | |
9f95a23c | 130 | ThirdPartyAccountApplier(RGWCtl* const ctl, |
11fdf7f2 | 131 | const rgw_user &acct_user_override, |
7c673cae FG |
132 | U&& decoratee) |
133 | : DecoratedApplier<T>(std::move(decoratee)), | |
9f95a23c | 134 | ctl(ctl), |
7c673cae FG |
135 | acct_user_override(acct_user_override) { |
136 | } | |
137 | ||
138 | void to_str(std::ostream& out) const override; | |
11fdf7f2 | 139 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override; /* out */ |
7c673cae FG |
140 | }; |
141 | ||
142 | /* static declaration: UNKNOWN_ACCT will be an empty rgw_user that is a result | |
143 | * of the default construction. */ | |
144 | template <typename T> | |
145 | const rgw_user ThirdPartyAccountApplier<T>::UNKNOWN_ACCT; | |
146 | ||
147 | template <typename T> | |
148 | void ThirdPartyAccountApplier<T>::to_str(std::ostream& out) const | |
149 | { | |
150 | out << "rgw::auth::ThirdPartyAccountApplier(" + acct_user_override.to_str() + ")" | |
151 | << " -> "; | |
152 | DecoratedApplier<T>::to_str(out); | |
153 | } | |
154 | ||
155 | template <typename T> | |
11fdf7f2 | 156 | void ThirdPartyAccountApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const |
7c673cae FG |
157 | { |
158 | if (UNKNOWN_ACCT == acct_user_override) { | |
159 | /* There is no override specified by the upper layer. This means that we'll | |
160 | * load the account owned by the authenticated identity (aka auth_user). */ | |
11fdf7f2 | 161 | DecoratedApplier<T>::load_acct_info(dpp, user_info); |
7c673cae FG |
162 | } else if (DecoratedApplier<T>::is_owner_of(acct_user_override)) { |
163 | /* The override has been specified but the account belongs to the authenticated | |
164 | * identity. We may safely forward the call to a next stage. */ | |
11fdf7f2 | 165 | DecoratedApplier<T>::load_acct_info(dpp, user_info); |
f91f0fd5 TL |
166 | } else if (this->is_anonymous()) { |
167 | /* If the user was authed by the anonymous engine then scope the ANON user | |
168 | * to the correct tenant */ | |
169 | if (acct_user_override.tenant.empty()) | |
170 | user_info.user_id = rgw_user(acct_user_override.id, RGW_USER_ANON_ID); | |
171 | else | |
172 | user_info.user_id = rgw_user(acct_user_override.tenant, RGW_USER_ANON_ID); | |
7c673cae FG |
173 | } else { |
174 | /* Compatibility mechanism for multi-tenancy. For more details refer to | |
175 | * load_acct_info method of rgw::auth::RemoteApplier. */ | |
176 | if (acct_user_override.tenant.empty()) { | |
177 | const rgw_user tenanted_uid(acct_user_override.id, acct_user_override.id); | |
178 | ||
9f95a23c | 179 | if (ctl->user->get_info_by_uid(tenanted_uid, &user_info, null_yield) >= 0) { |
7c673cae FG |
180 | /* Succeeded. */ |
181 | return; | |
182 | } | |
183 | } | |
184 | ||
9f95a23c | 185 | const int ret = ctl->user->get_info_by_uid(acct_user_override, &user_info, null_yield); |
7c673cae FG |
186 | if (ret < 0) { |
187 | /* We aren't trying to recover from ENOENT here. It's supposed that creating | |
188 | * someone else's account isn't a thing we want to support in this filter. */ | |
189 | if (ret == -ENOENT) { | |
190 | throw -EACCES; | |
191 | } else { | |
192 | throw ret; | |
193 | } | |
194 | } | |
195 | ||
196 | } | |
197 | } | |
198 | ||
199 | template <typename T> static inline | |
9f95a23c | 200 | ThirdPartyAccountApplier<T> add_3rdparty(RGWCtl* const ctl, |
11fdf7f2 | 201 | const rgw_user &acct_user_override, |
7c673cae | 202 | T&& t) { |
9f95a23c | 203 | return ThirdPartyAccountApplier<T>(ctl, acct_user_override, |
7c673cae FG |
204 | std::forward<T>(t)); |
205 | } | |
206 | ||
207 | ||
208 | template <typename T> | |
209 | class SysReqApplier : public DecoratedApplier<T> { | |
210 | CephContext* const cct; | |
9f95a23c | 211 | /*const*/ RGWCtl* const ctl; |
7c673cae FG |
212 | const RGWHTTPArgs& args; |
213 | mutable boost::tribool is_system; | |
214 | ||
215 | public: | |
216 | template <typename U> | |
217 | SysReqApplier(CephContext* const cct, | |
9f95a23c | 218 | /*const*/ RGWCtl* const ctl, |
7c673cae FG |
219 | const req_state* const s, |
220 | U&& decoratee) | |
221 | : DecoratedApplier<T>(std::forward<T>(decoratee)), | |
222 | cct(cct), | |
9f95a23c | 223 | ctl(ctl), |
7c673cae FG |
224 | args(s->info.args), |
225 | is_system(boost::logic::indeterminate) { | |
226 | } | |
227 | ||
228 | void to_str(std::ostream& out) const override; | |
11fdf7f2 TL |
229 | void load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const override; /* out */ |
230 | void modify_request_state(const DoutPrefixProvider* dpp, req_state* s) const override; /* in/out */ | |
7c673cae FG |
231 | }; |
232 | ||
233 | template <typename T> | |
234 | void SysReqApplier<T>::to_str(std::ostream& out) const | |
235 | { | |
236 | out << "rgw::auth::SysReqApplier" << " -> "; | |
237 | DecoratedApplier<T>::to_str(out); | |
238 | } | |
239 | ||
240 | template <typename T> | |
11fdf7f2 | 241 | void SysReqApplier<T>::load_acct_info(const DoutPrefixProvider* dpp, RGWUserInfo& user_info) const |
7c673cae | 242 | { |
11fdf7f2 | 243 | DecoratedApplier<T>::load_acct_info(dpp, user_info); |
7c673cae FG |
244 | is_system = user_info.system; |
245 | ||
246 | if (is_system) { | |
11fdf7f2 | 247 | //ldpp_dout(dpp, 20) << "system request" << dendl; |
7c673cae FG |
248 | |
249 | rgw_user effective_uid(args.sys_get(RGW_SYS_PARAM_PREFIX "uid")); | |
250 | if (! effective_uid.empty()) { | |
251 | /* We aren't writing directly to user_info for consistency and security | |
252 | * reasons. rgw_get_user_info_by_uid doesn't trigger the operator=() but | |
253 | * calls ::decode instead. */ | |
254 | RGWUserInfo euser_info; | |
9f95a23c | 255 | if (ctl->user->get_info_by_uid(effective_uid, &euser_info, null_yield) < 0) { |
11fdf7f2 | 256 | //ldpp_dout(dpp, 0) << "User lookup failed!" << dendl; |
7c673cae FG |
257 | throw -EACCES; |
258 | } | |
259 | user_info = euser_info; | |
260 | } | |
261 | } | |
262 | } | |
263 | ||
264 | template <typename T> | |
11fdf7f2 | 265 | void SysReqApplier<T>::modify_request_state(const DoutPrefixProvider* dpp, req_state* const s) const |
7c673cae FG |
266 | { |
267 | if (boost::logic::indeterminate(is_system)) { | |
268 | RGWUserInfo unused_info; | |
11fdf7f2 | 269 | load_acct_info(dpp, unused_info); |
7c673cae FG |
270 | } |
271 | ||
272 | if (is_system) { | |
273 | s->info.args.set_system(); | |
274 | s->system_request = true; | |
275 | } | |
11fdf7f2 | 276 | DecoratedApplier<T>::modify_request_state(dpp, s); |
7c673cae FG |
277 | } |
278 | ||
279 | template <typename T> static inline | |
280 | SysReqApplier<T> add_sysreq(CephContext* const cct, | |
9f95a23c | 281 | /* const */ RGWCtl* const ctl, |
7c673cae FG |
282 | const req_state* const s, |
283 | T&& t) { | |
9f95a23c | 284 | return SysReqApplier<T>(cct, ctl, s, std::forward<T>(t)); |
7c673cae FG |
285 | } |
286 | ||
287 | } /* namespace auth */ | |
288 | } /* namespace rgw */ | |
289 | ||
290 | #endif /* CEPH_RGW_AUTH_FILTERS_H */ |