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acl.h
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1 /*-------------------------------------------------------------------------
2  *
3  * acl.h
4  * Definition of (and support for) access control list data structures.
5  *
6  *
7  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/utils/acl.h
11  *
12  * NOTES
13  * An ACL array is simply an array of AclItems, representing the union
14  * of the privileges represented by the individual items. A zero-length
15  * array represents "no privileges".
16  *
17  * The order of items in the array is important as client utilities (in
18  * particular, pg_dump, though possibly other clients) expect to be able
19  * to issue GRANTs in the ordering of the items in the array. The reason
20  * this matters is that GRANTs WITH GRANT OPTION must be before any GRANTs
21  * which depend on it. This happens naturally in the backend during
22  * operations as we update ACLs in-place, new items are appended, and
23  * existing entries are only removed if there's no dependency on them (no
24  * GRANT can been based on it, or, if there was, those GRANTs are also
25  * removed).
26  *
27  * For backward-compatibility purposes we have to allow null ACL entries
28  * in system catalogs. A null ACL will be treated as meaning "default
29  * protection" (i.e., whatever acldefault() returns).
30  *-------------------------------------------------------------------------
31  */
32 #ifndef ACL_H
33 #define ACL_H
34 
35 #include "access/htup.h"
36 #include "nodes/parsenodes.h"
37 #include "parser/parse_node.h"
38 #include "utils/snapshot.h"
39 
40 
41 /*
42  * typedef AclMode is declared in parsenodes.h, also the individual privilege
43  * bit meanings are defined there
44  */
45 
46 #define ACL_ID_PUBLIC 0 /* placeholder for id in a PUBLIC acl item */
47 
48 /*
49  * AclItem
50  *
51  * Note: must be same size on all platforms, because the size is hardcoded
52  * in the pg_type.h entry for aclitem.
53  */
54 typedef struct AclItem
55 {
56  Oid ai_grantee; /* ID that this item grants privs to */
57  Oid ai_grantor; /* grantor of privs */
58  AclMode ai_privs; /* privilege bits */
60 
61 /*
62  * The upper 32 bits of the ai_privs field of an AclItem are the grant option
63  * bits, and the lower 32 bits are the actual privileges. We use "rights"
64  * to mean the combined grant option and privilege bits fields.
65  */
66 #define ACLITEM_GET_PRIVS(item) ((item).ai_privs & 0xFFFFFFFF)
67 #define ACLITEM_GET_GOPTIONS(item) (((item).ai_privs >> 32) & 0xFFFFFFFF)
68 #define ACLITEM_GET_RIGHTS(item) ((item).ai_privs)
69 
70 #define ACL_GRANT_OPTION_FOR(privs) (((AclMode) (privs) & 0xFFFFFFFF) << 32)
71 #define ACL_OPTION_TO_PRIVS(privs) (((AclMode) (privs) >> 32) & 0xFFFFFFFF)
72 
73 #define ACLITEM_SET_PRIVS(item,privs) \
74  ((item).ai_privs = ((item).ai_privs & ~((AclMode) 0xFFFFFFFF)) | \
75  ((AclMode) (privs) & 0xFFFFFFFF))
76 #define ACLITEM_SET_GOPTIONS(item,goptions) \
77  ((item).ai_privs = ((item).ai_privs & ~(((AclMode) 0xFFFFFFFF) << 32)) | \
78  (((AclMode) (goptions) & 0xFFFFFFFF) << 32))
79 #define ACLITEM_SET_RIGHTS(item,rights) \
80  ((item).ai_privs = (AclMode) (rights))
81 
82 #define ACLITEM_SET_PRIVS_GOPTIONS(item,privs,goptions) \
83  ((item).ai_privs = ((AclMode) (privs) & 0xFFFFFFFF) | \
84  (((AclMode) (goptions) & 0xFFFFFFFF) << 32))
85 
86 
87 #define ACLITEM_ALL_PRIV_BITS ((AclMode) 0xFFFFFFFF)
88 #define ACLITEM_ALL_GOPTION_BITS ((AclMode) 0xFFFFFFFF << 32)
89 
90 /*
91  * Definitions for convenient access to Acl (array of AclItem).
92  * These are standard PostgreSQL arrays, but are restricted to have one
93  * dimension and no nulls. We also ignore the lower bound when reading,
94  * and set it to one when writing.
95  *
96  * CAUTION: as of PostgreSQL 7.1, these arrays are toastable (just like all
97  * other array types). Therefore, be careful to detoast them with the
98  * macros provided, unless you know for certain that a particular array
99  * can't have been toasted.
100  */
101 
102 
103 /*
104  * Acl a one-dimensional array of AclItem
105  */
106 typedef struct ArrayType Acl;
107 
108 #define ACL_NUM(ACL) (ARR_DIMS(ACL)[0])
109 #define ACL_DAT(ACL) ((AclItem *) ARR_DATA_PTR(ACL))
110 #define ACL_N_SIZE(N) (ARR_OVERHEAD_NONULLS(1) + ((N) * sizeof(AclItem)))
111 #define ACL_SIZE(ACL) ARR_SIZE(ACL)
112 
113 /*
114  * fmgr macros for these types
115  */
116 #define DatumGetAclItemP(X) ((AclItem *) DatumGetPointer(X))
117 #define PG_GETARG_ACLITEM_P(n) DatumGetAclItemP(PG_GETARG_DATUM(n))
118 #define PG_RETURN_ACLITEM_P(x) PG_RETURN_POINTER(x)
119 
120 #define DatumGetAclP(X) ((Acl *) PG_DETOAST_DATUM(X))
121 #define DatumGetAclPCopy(X) ((Acl *) PG_DETOAST_DATUM_COPY(X))
122 #define PG_GETARG_ACL_P(n) DatumGetAclP(PG_GETARG_DATUM(n))
123 #define PG_GETARG_ACL_P_COPY(n) DatumGetAclPCopy(PG_GETARG_DATUM(n))
124 #define PG_RETURN_ACL_P(x) PG_RETURN_POINTER(x)
125 
126 /*
127  * ACL modification opcodes for aclupdate
128  */
129 #define ACL_MODECHG_ADD 1
130 #define ACL_MODECHG_DEL 2
131 #define ACL_MODECHG_EQL 3
132 
133 /*
134  * External representations of the privilege bits --- aclitemin/aclitemout
135  * represent each possible privilege bit with a distinct 1-character code
136  */
137 #define ACL_INSERT_CHR 'a' /* formerly known as "append" */
138 #define ACL_SELECT_CHR 'r' /* formerly known as "read" */
139 #define ACL_UPDATE_CHR 'w' /* formerly known as "write" */
140 #define ACL_DELETE_CHR 'd'
141 #define ACL_TRUNCATE_CHR 'D' /* super-delete, as it were */
142 #define ACL_REFERENCES_CHR 'x'
143 #define ACL_TRIGGER_CHR 't'
144 #define ACL_EXECUTE_CHR 'X'
145 #define ACL_USAGE_CHR 'U'
146 #define ACL_CREATE_CHR 'C'
147 #define ACL_CREATE_TEMP_CHR 'T'
148 #define ACL_CONNECT_CHR 'c'
149 #define ACL_SET_CHR 's'
150 #define ACL_ALTER_SYSTEM_CHR 'A'
151 
152 /* string holding all privilege code chars, in order by bitmask position */
153 #define ACL_ALL_RIGHTS_STR "arwdDxtXUCTcsA"
154 
155 /*
156  * Bitmasks defining "all rights" for each supported object type
157  */
158 #define ACL_ALL_RIGHTS_COLUMN (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_REFERENCES)
159 #define ACL_ALL_RIGHTS_RELATION (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_DELETE|ACL_TRUNCATE|ACL_REFERENCES|ACL_TRIGGER)
160 #define ACL_ALL_RIGHTS_SEQUENCE (ACL_USAGE|ACL_SELECT|ACL_UPDATE)
161 #define ACL_ALL_RIGHTS_DATABASE (ACL_CREATE|ACL_CREATE_TEMP|ACL_CONNECT)
162 #define ACL_ALL_RIGHTS_FDW (ACL_USAGE)
163 #define ACL_ALL_RIGHTS_FOREIGN_SERVER (ACL_USAGE)
164 #define ACL_ALL_RIGHTS_FUNCTION (ACL_EXECUTE)
165 #define ACL_ALL_RIGHTS_LANGUAGE (ACL_USAGE)
166 #define ACL_ALL_RIGHTS_LARGEOBJECT (ACL_SELECT|ACL_UPDATE)
167 #define ACL_ALL_RIGHTS_PARAMETER_ACL (ACL_SET|ACL_ALTER_SYSTEM)
168 #define ACL_ALL_RIGHTS_SCHEMA (ACL_USAGE|ACL_CREATE)
169 #define ACL_ALL_RIGHTS_TABLESPACE (ACL_CREATE)
170 #define ACL_ALL_RIGHTS_TYPE (ACL_USAGE)
171 
172 /* operation codes for pg_*_aclmask */
173 typedef enum
174 {
175  ACLMASK_ALL, /* normal case: compute all bits */
176  ACLMASK_ANY /* return when result is known nonzero */
178 
179 /* result codes for pg_*_aclcheck */
180 typedef enum
181 {
186 
187 
188 /*
189  * routines used internally
190  */
191 extern Acl *acldefault(ObjectType objtype, Oid ownerId);
192 extern Acl *get_user_default_acl(ObjectType objtype, Oid ownerId,
193  Oid nsp_oid);
194 extern void recordDependencyOnNewAcl(Oid classId, Oid objectId, int32 objsubId,
195  Oid ownerId, Acl *acl);
196 
197 extern Acl *aclupdate(const Acl *old_acl, const AclItem *mod_aip,
198  int modechg, Oid ownerId, DropBehavior behavior);
199 extern Acl *aclnewowner(const Acl *old_acl, Oid oldOwnerId, Oid newOwnerId);
200 extern Acl *make_empty_acl(void);
201 extern Acl *aclcopy(const Acl *orig_acl);
202 extern Acl *aclconcat(const Acl *left_acl, const Acl *right_acl);
203 extern Acl *aclmerge(const Acl *left_acl, const Acl *right_acl, Oid ownerId);
204 extern void aclitemsort(Acl *acl);
205 extern bool aclequal(const Acl *left_acl, const Acl *right_acl);
206 
207 extern AclMode aclmask(const Acl *acl, Oid roleid, Oid ownerId,
208  AclMode mask, AclMaskHow how);
209 extern int aclmembers(const Acl *acl, Oid **roleids);
210 
211 extern bool has_privs_of_role(Oid member, Oid role);
212 extern bool member_can_set_role(Oid member, Oid role);
213 extern void check_can_set_role(Oid member, Oid role);
214 extern bool is_member_of_role(Oid member, Oid role);
215 extern bool is_member_of_role_nosuper(Oid member, Oid role);
216 extern bool is_admin_of_role(Oid member, Oid role);
217 extern Oid select_best_admin(Oid member, Oid role);
218 extern Oid get_role_oid(const char *rolname, bool missing_ok);
219 extern Oid get_role_oid_or_public(const char *rolname);
220 extern Oid get_rolespec_oid(const RoleSpec *role, bool missing_ok);
221 extern void check_rolespec_name(const RoleSpec *role, const char *detail_msg);
222 extern HeapTuple get_rolespec_tuple(const RoleSpec *role);
223 extern char *get_rolespec_name(const RoleSpec *role);
224 
225 extern void select_best_grantor(Oid roleId, AclMode privileges,
226  const Acl *acl, Oid ownerId,
227  Oid *grantorId, AclMode *grantOptions);
228 
229 extern void initialize_acl(void);
230 
231 /*
232  * prototypes for functions in aclchk.c
233  */
234 extern void ExecuteGrantStmt(GrantStmt *stmt);
236 
237 extern void RemoveRoleFromObjectACL(Oid roleid, Oid classid, Oid objid);
238 
239 extern AclMode pg_class_aclmask(Oid table_oid, Oid roleid,
240  AclMode mask, AclMaskHow how);
241 
242 /* generic function */
243 extern AclResult object_aclcheck(Oid classid, Oid objectid, Oid roleid, AclMode mode);
244 
245 /* special cases */
247  Oid roleid, AclMode mode);
249  Oid roleid, AclMode mode,
250  bool *is_missing);
251 extern AclResult pg_attribute_aclcheck_all(Oid table_oid, Oid roleid,
252  AclMode mode, AclMaskHow how);
253 extern AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode);
254 extern AclResult pg_class_aclcheck_ext(Oid table_oid, Oid roleid,
255  AclMode mode, bool *is_missing);
256 extern AclResult pg_parameter_aclcheck(const char *name, Oid roleid,
257  AclMode mode);
258 extern AclResult pg_largeobject_aclcheck_snapshot(Oid lobj_oid, Oid roleid,
259  AclMode mode, Snapshot snapshot);
260 
261 extern void aclcheck_error(AclResult aclerr, ObjectType objtype,
262  const char *objectname);
263 
264 extern void aclcheck_error_col(AclResult aclerr, ObjectType objtype,
265  const char *objectname, const char *colname);
266 
267 extern void aclcheck_error_type(AclResult aclerr, Oid typeOid);
268 
269 extern void recordExtObjInitPriv(Oid objoid, Oid classoid);
270 extern void removeExtObjInitPriv(Oid objoid, Oid classoid);
271 
272 
273 /* ownercheck routines just return true (owner) or false (not) */
274 extern bool object_ownercheck(Oid classid, Oid objectid, Oid roleid);
275 extern bool has_createrole_privilege(Oid roleid);
276 extern bool has_bypassrls_privilege(Oid roleid);
277 
278 #endif /* ACL_H */
void initialize_acl(void)
Definition: acl.c:4771
void ExecuteGrantStmt(GrantStmt *stmt)
Definition: aclchk.c:382
AclResult pg_largeobject_aclcheck_snapshot(Oid lobj_oid, Oid roleid, AclMode mode, Snapshot snapshot)
Definition: aclchk.c:3947
Acl * aclupdate(const Acl *old_acl, const AclItem *mod_aip, int modechg, Oid ownerId, DropBehavior behavior)
Definition: acl.c:966
bool is_admin_of_role(Oid member, Oid role)
Definition: acl.c:5091
bool has_bypassrls_privilege(Oid roleid)
Definition: aclchk.c:4057
AclResult pg_class_aclcheck_ext(Oid table_oid, Oid roleid, AclMode mode, bool *is_missing)
Definition: aclchk.c:3920
void aclcheck_error_col(AclResult aclerr, ObjectType objtype, const char *objectname, const char *colname)
Definition: aclchk.c:2958
void recordDependencyOnNewAcl(Oid classId, Oid objectId, int32 objsubId, Oid ownerId, Acl *acl)
Definition: aclchk.c:4192
char * get_rolespec_name(const RoleSpec *role)
Definition: acl.c:5366
Oid select_best_admin(Oid member, Oid role)
Definition: acl.c:5116
Oid get_role_oid_or_public(const char *rolname)
Definition: acl.c:5265
void ExecAlterDefaultPrivilegesStmt(ParseState *pstate, AlterDefaultPrivilegesStmt *stmt)
Definition: aclchk.c:966
bool aclequal(const Acl *left_acl, const Acl *right_acl)
Definition: acl.c:533
AclResult
Definition: acl.h:181
@ ACLCHECK_NO_PRIV
Definition: acl.h:183
@ ACLCHECK_OK
Definition: acl.h:182
@ ACLCHECK_NOT_OWNER
Definition: acl.h:184
AclResult pg_attribute_aclcheck_all(Oid table_oid, Oid roleid, AclMode mode, AclMaskHow how)
Definition: aclchk.c:3823
struct AclItem AclItem
bool is_member_of_role(Oid member, Oid role)
Definition: acl.c:5041
AclResult pg_parameter_aclcheck(const char *name, Oid roleid, AclMode mode)
Definition: aclchk.c:3935
void select_best_grantor(Oid roleId, AclMode privileges, const Acl *acl, Oid ownerId, Oid *grantorId, AclMode *grantOptions)
Definition: acl.c:5171
bool is_member_of_role_nosuper(Oid member, Oid role)
Definition: acl.c:5069
bool has_privs_of_role(Oid member, Oid role)
Definition: acl.c:4961
void recordExtObjInitPriv(Oid objoid, Oid classoid)
Definition: aclchk.c:4219
int aclmembers(const Acl *acl, Oid **roleids)
Definition: acl.c:1508
Acl * aclconcat(const Acl *left_acl, const Acl *right_acl)
Definition: acl.c:451
Acl * aclcopy(const Acl *orig_acl)
Definition: acl.c:431
bool member_can_set_role(Oid member, Oid role)
Definition: acl.c:4995
void aclitemsort(Acl *acl)
Definition: acl.c:519
AclMode aclmask(const Acl *acl, Oid roleid, Oid ownerId, AclMode mask, AclMaskHow how)
Definition: acl.c:1356
Acl * acldefault(ObjectType objtype, Oid ownerId)
Definition: acl.c:777
Acl * make_empty_acl(void)
Definition: acl.c:422
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:2669
Acl * aclnewowner(const Acl *old_acl, Oid oldOwnerId, Oid newOwnerId)
Definition: acl.c:1087
AclResult pg_attribute_aclcheck(Oid table_oid, AttrNumber attnum, Oid roleid, AclMode mode)
Definition: aclchk.c:3779
Oid get_role_oid(const char *rolname, bool missing_ok)
Definition: acl.c:5247
AclResult object_aclcheck(Oid classid, Oid objectid, Oid roleid, AclMode mode)
Definition: aclchk.c:3760
Acl * get_user_default_acl(ObjectType objtype, Oid ownerId, Oid nsp_oid)
Definition: aclchk.c:4116
bool object_ownercheck(Oid classid, Oid objectid, Oid roleid)
Definition: aclchk.c:3961
AclResult pg_attribute_aclcheck_ext(Oid table_oid, AttrNumber attnum, Oid roleid, AclMode mode, bool *is_missing)
Definition: aclchk.c:3793
void check_can_set_role(Oid member, Oid role)
Definition: acl.c:5018
AclMode pg_class_aclmask(Oid table_oid, Oid roleid, AclMode mask, AclMaskHow how)
Definition: aclchk.c:3263
void check_rolespec_name(const RoleSpec *role, const char *detail_msg)
Definition: acl.c:5388
void aclcheck_error_type(AclResult aclerr, Oid typeOid)
Definition: aclchk.c:2988
bool has_createrole_privilege(Oid roleid)
Definition: aclchk.c:4038
AclMaskHow
Definition: acl.h:174
@ ACLMASK_ANY
Definition: acl.h:176
@ ACLMASK_ALL
Definition: acl.h:175
Oid get_rolespec_oid(const RoleSpec *role, bool missing_ok)
Definition: acl.c:5281
void RemoveRoleFromObjectACL(Oid roleid, Oid classid, Oid objid)
Definition: aclchk.c:1444
AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode)
Definition: aclchk.c:3908
Acl * aclmerge(const Acl *left_acl, const Acl *right_acl, Oid ownerId)
Definition: acl.c:475
HeapTuple get_rolespec_tuple(const RoleSpec *role)
Definition: acl.c:5320
void removeExtObjInitPriv(Oid objoid, Oid classoid)
Definition: aclchk.c:4382
int16 AttrNumber
Definition: attnum.h:21
signed int int32
Definition: c.h:483
#define stmt
Definition: indent_codes.h:59
uint64 AclMode
Definition: parsenodes.h:81
DropBehavior
Definition: parsenodes.h:2192
ObjectType
Definition: parsenodes.h:2119
int16 attnum
Definition: pg_attribute.h:74
NameData rolname
Definition: pg_authid.h:34
static PgChecksumMode mode
Definition: pg_checksums.c:56
unsigned int Oid
Definition: postgres_ext.h:31
Definition: acl.h:55
Oid ai_grantee
Definition: acl.h:56
AclMode ai_privs
Definition: acl.h:58
Oid ai_grantor
Definition: acl.h:57
const char * name