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Diffstat (limited to 'src/include/utils/acl.h')
| -rw-r--r-- | src/include/utils/acl.h | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/src/include/utils/acl.h b/src/include/utils/acl.h new file mode 100644 index 0000000..af771c9 --- /dev/null +++ b/src/include/utils/acl.h @@ -0,0 +1,322 @@ +/*------------------------------------------------------------------------- + * + * acl.h + * Definition of (and support for) access control list data structures. + * + * + * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/utils/acl.h + * + * NOTES + * An ACL array is simply an array of AclItems, representing the union + * of the privileges represented by the individual items. A zero-length + * array represents "no privileges". + * + * The order of items in the array is important as client utilities (in + * particular, pg_dump, though possibly other clients) expect to be able + * to issue GRANTs in the ordering of the items in the array. The reason + * this matters is that GRANTs WITH GRANT OPTION must be before any GRANTs + * which depend on it. This happens naturally in the backend during + * operations as we update ACLs in-place, new items are appended, and + * existing entries are only removed if there's no dependency on them (no + * GRANT can been based on it, or, if there was, those GRANTs are also + * removed). + * + * For backward-compatibility purposes we have to allow null ACL entries + * in system catalogs. A null ACL will be treated as meaning "default + * protection" (i.e., whatever acldefault() returns). + *------------------------------------------------------------------------- + */ +#ifndef ACL_H +#define ACL_H + +#include "access/htup.h" +#include "nodes/parsenodes.h" +#include "parser/parse_node.h" +#include "utils/snapshot.h" + + +/* + * typedef AclMode is declared in parsenodes.h, also the individual privilege + * bit meanings are defined there + */ + +#define ACL_ID_PUBLIC 0 /* placeholder for id in a PUBLIC acl item */ + +/* + * AclItem + * + * Note: must be same size on all platforms, because the size is hardcoded + * in the pg_type.h entry for aclitem. + */ +typedef struct AclItem +{ + Oid ai_grantee; /* ID that this item grants privs to */ + Oid ai_grantor; /* grantor of privs */ + AclMode ai_privs; /* privilege bits */ +} AclItem; + +/* + * The upper 16 bits of the ai_privs field of an AclItem are the grant option + * bits, and the lower 16 bits are the actual privileges. We use "rights" + * to mean the combined grant option and privilege bits fields. + */ +#define ACLITEM_GET_PRIVS(item) ((item).ai_privs & 0xFFFF) +#define ACLITEM_GET_GOPTIONS(item) (((item).ai_privs >> 16) & 0xFFFF) +#define ACLITEM_GET_RIGHTS(item) ((item).ai_privs) + +#define ACL_GRANT_OPTION_FOR(privs) (((AclMode) (privs) & 0xFFFF) << 16) +#define ACL_OPTION_TO_PRIVS(privs) (((AclMode) (privs) >> 16) & 0xFFFF) + +#define ACLITEM_SET_PRIVS(item,privs) \ + ((item).ai_privs = ((item).ai_privs & ~((AclMode) 0xFFFF)) | \ + ((AclMode) (privs) & 0xFFFF)) +#define ACLITEM_SET_GOPTIONS(item,goptions) \ + ((item).ai_privs = ((item).ai_privs & ~(((AclMode) 0xFFFF) << 16)) | \ + (((AclMode) (goptions) & 0xFFFF) << 16)) +#define ACLITEM_SET_RIGHTS(item,rights) \ + ((item).ai_privs = (AclMode) (rights)) + +#define ACLITEM_SET_PRIVS_GOPTIONS(item,privs,goptions) \ + ((item).ai_privs = ((AclMode) (privs) & 0xFFFF) | \ + (((AclMode) (goptions) & 0xFFFF) << 16)) + + +#define ACLITEM_ALL_PRIV_BITS ((AclMode) 0xFFFF) +#define ACLITEM_ALL_GOPTION_BITS ((AclMode) 0xFFFF << 16) + +/* + * Definitions for convenient access to Acl (array of AclItem). + * These are standard PostgreSQL arrays, but are restricted to have one + * dimension and no nulls. We also ignore the lower bound when reading, + * and set it to one when writing. + * + * CAUTION: as of PostgreSQL 7.1, these arrays are toastable (just like all + * other array types). Therefore, be careful to detoast them with the + * macros provided, unless you know for certain that a particular array + * can't have been toasted. + */ + + +/* + * Acl a one-dimensional array of AclItem + */ +typedef struct ArrayType Acl; + +#define ACL_NUM(ACL) (ARR_DIMS(ACL)[0]) +#define ACL_DAT(ACL) ((AclItem *) ARR_DATA_PTR(ACL)) +#define ACL_N_SIZE(N) (ARR_OVERHEAD_NONULLS(1) + ((N) * sizeof(AclItem))) +#define ACL_SIZE(ACL) ARR_SIZE(ACL) + +/* + * fmgr macros for these types + */ +#define DatumGetAclItemP(X) ((AclItem *) DatumGetPointer(X)) +#define PG_GETARG_ACLITEM_P(n) DatumGetAclItemP(PG_GETARG_DATUM(n)) +#define PG_RETURN_ACLITEM_P(x) PG_RETURN_POINTER(x) + +#define DatumGetAclP(X) ((Acl *) PG_DETOAST_DATUM(X)) +#define DatumGetAclPCopy(X) ((Acl *) PG_DETOAST_DATUM_COPY(X)) +#define PG_GETARG_ACL_P(n) DatumGetAclP(PG_GETARG_DATUM(n)) +#define PG_GETARG_ACL_P_COPY(n) DatumGetAclPCopy(PG_GETARG_DATUM(n)) +#define PG_RETURN_ACL_P(x) PG_RETURN_POINTER(x) + +/* + * ACL modification opcodes for aclupdate + */ +#define ACL_MODECHG_ADD 1 +#define ACL_MODECHG_DEL 2 +#define ACL_MODECHG_EQL 3 + +/* + * External representations of the privilege bits --- aclitemin/aclitemout + * represent each possible privilege bit with a distinct 1-character code + */ +#define ACL_INSERT_CHR 'a' /* formerly known as "append" */ +#define ACL_SELECT_CHR 'r' /* formerly known as "read" */ +#define ACL_UPDATE_CHR 'w' /* formerly known as "write" */ +#define ACL_DELETE_CHR 'd' +#define ACL_TRUNCATE_CHR 'D' /* super-delete, as it were */ +#define ACL_REFERENCES_CHR 'x' +#define ACL_TRIGGER_CHR 't' +#define ACL_EXECUTE_CHR 'X' +#define ACL_USAGE_CHR 'U' +#define ACL_CREATE_CHR 'C' +#define ACL_CREATE_TEMP_CHR 'T' +#define ACL_CONNECT_CHR 'c' + +/* string holding all privilege code chars, in order by bitmask position */ +#define ACL_ALL_RIGHTS_STR "arwdDxtXUCTc" + +/* + * Bitmasks defining "all rights" for each supported object type + */ +#define ACL_ALL_RIGHTS_COLUMN (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_REFERENCES) +#define ACL_ALL_RIGHTS_RELATION (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_DELETE|ACL_TRUNCATE|ACL_REFERENCES|ACL_TRIGGER) +#define ACL_ALL_RIGHTS_SEQUENCE (ACL_USAGE|ACL_SELECT|ACL_UPDATE) +#define ACL_ALL_RIGHTS_DATABASE (ACL_CREATE|ACL_CREATE_TEMP|ACL_CONNECT) +#define ACL_ALL_RIGHTS_FDW (ACL_USAGE) +#define ACL_ALL_RIGHTS_FOREIGN_SERVER (ACL_USAGE) +#define ACL_ALL_RIGHTS_FUNCTION (ACL_EXECUTE) +#define ACL_ALL_RIGHTS_LANGUAGE (ACL_USAGE) +#define ACL_ALL_RIGHTS_LARGEOBJECT (ACL_SELECT|ACL_UPDATE) +#define ACL_ALL_RIGHTS_SCHEMA (ACL_USAGE|ACL_CREATE) +#define ACL_ALL_RIGHTS_TABLESPACE (ACL_CREATE) +#define ACL_ALL_RIGHTS_TYPE (ACL_USAGE) + +/* operation codes for pg_*_aclmask */ +typedef enum +{ + ACLMASK_ALL, /* normal case: compute all bits */ + ACLMASK_ANY /* return when result is known nonzero */ +} AclMaskHow; + +/* result codes for pg_*_aclcheck */ +typedef enum +{ + ACLCHECK_OK = 0, + ACLCHECK_NO_PRIV, + ACLCHECK_NOT_OWNER +} AclResult; + + +/* + * routines used internally + */ +extern Acl *acldefault(ObjectType objtype, Oid ownerId); +extern Acl *get_user_default_acl(ObjectType objtype, Oid ownerId, + Oid nsp_oid); +extern void recordDependencyOnNewAcl(Oid classId, Oid objectId, int32 objsubId, + Oid ownerId, Acl *acl); + +extern Acl *aclupdate(const Acl *old_acl, const AclItem *mod_aip, + int modechg, Oid ownerId, DropBehavior behavior); +extern Acl *aclnewowner(const Acl *old_acl, Oid oldOwnerId, Oid newOwnerId); +extern Acl *make_empty_acl(void); +extern Acl *aclcopy(const Acl *orig_acl); +extern Acl *aclconcat(const Acl *left_acl, const Acl *right_acl); +extern Acl *aclmerge(const Acl *left_acl, const Acl *right_acl, Oid ownerId); +extern void aclitemsort(Acl *acl); +extern bool aclequal(const Acl *left_acl, const Acl *right_acl); + +extern AclMode aclmask(const Acl *acl, Oid roleid, Oid ownerId, + AclMode mask, AclMaskHow how); +extern int aclmembers(const Acl *acl, Oid **roleids); + +extern bool has_privs_of_role(Oid member, Oid role); +extern bool is_member_of_role(Oid member, Oid role); +extern bool is_member_of_role_nosuper(Oid member, Oid role); +extern bool is_admin_of_role(Oid member, Oid role); +extern void check_is_member_of_role(Oid member, Oid role); +extern Oid get_role_oid(const char *rolename, bool missing_ok); +extern Oid get_role_oid_or_public(const char *rolename); +extern Oid get_rolespec_oid(const RoleSpec *role, bool missing_ok); +extern void check_rolespec_name(const RoleSpec *role, const char *detail_msg); +extern HeapTuple get_rolespec_tuple(const RoleSpec *role); +extern char *get_rolespec_name(const RoleSpec *role); + +extern void select_best_grantor(Oid roleId, AclMode privileges, + const Acl *acl, Oid ownerId, + Oid *grantorId, AclMode *grantOptions); + +extern void initialize_acl(void); + +/* + * prototypes for functions in aclchk.c + */ +extern void ExecuteGrantStmt(GrantStmt *stmt); +extern void ExecAlterDefaultPrivilegesStmt(ParseState *pstate, AlterDefaultPrivilegesStmt *stmt); + +extern void RemoveRoleFromObjectACL(Oid roleid, Oid classid, Oid objid); + +extern AclMode pg_attribute_aclmask(Oid table_oid, AttrNumber attnum, + Oid roleid, AclMode mask, AclMaskHow how); +extern AclMode pg_attribute_aclmask_ext(Oid table_oid, AttrNumber attnum, + Oid roleid, AclMode mask, + AclMaskHow how, bool *is_missing); +extern AclMode pg_class_aclmask(Oid table_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_class_aclmask_ext(Oid table_oid, Oid roleid, + AclMode mask, AclMaskHow how, + bool *is_missing); +extern AclMode pg_database_aclmask(Oid db_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_proc_aclmask(Oid proc_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_language_aclmask(Oid lang_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_largeobject_aclmask_snapshot(Oid lobj_oid, Oid roleid, + AclMode mask, AclMaskHow how, Snapshot snapshot); +extern AclMode pg_namespace_aclmask(Oid nsp_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_tablespace_aclmask(Oid spc_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_foreign_data_wrapper_aclmask(Oid fdw_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_foreign_server_aclmask(Oid srv_oid, Oid roleid, + AclMode mask, AclMaskHow how); +extern AclMode pg_type_aclmask(Oid type_oid, Oid roleid, + AclMode mask, AclMaskHow how); + +extern AclResult pg_attribute_aclcheck(Oid table_oid, AttrNumber attnum, + Oid roleid, AclMode mode); +extern AclResult pg_attribute_aclcheck_ext(Oid table_oid, AttrNumber attnum, + Oid roleid, AclMode mode, + bool *is_missing); +extern AclResult pg_attribute_aclcheck_all(Oid table_oid, Oid roleid, + AclMode mode, AclMaskHow how); +extern AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode); +extern AclResult pg_class_aclcheck_ext(Oid table_oid, Oid roleid, + AclMode mode, bool *is_missing); +extern AclResult pg_database_aclcheck(Oid db_oid, Oid roleid, AclMode mode); +extern AclResult pg_proc_aclcheck(Oid proc_oid, Oid roleid, AclMode mode); +extern AclResult pg_language_aclcheck(Oid lang_oid, Oid roleid, AclMode mode); +extern AclResult pg_largeobject_aclcheck_snapshot(Oid lang_oid, Oid roleid, + AclMode mode, Snapshot snapshot); +extern AclResult pg_namespace_aclcheck(Oid nsp_oid, Oid roleid, AclMode mode); +extern AclResult pg_tablespace_aclcheck(Oid spc_oid, Oid roleid, AclMode mode); +extern AclResult pg_foreign_data_wrapper_aclcheck(Oid fdw_oid, Oid roleid, AclMode mode); +extern AclResult pg_foreign_server_aclcheck(Oid srv_oid, Oid roleid, AclMode mode); +extern AclResult pg_type_aclcheck(Oid type_oid, Oid roleid, AclMode mode); + +extern void aclcheck_error(AclResult aclerr, ObjectType objtype, + const char *objectname); + +extern void aclcheck_error_col(AclResult aclerr, ObjectType objtype, + const char *objectname, const char *colname); + +extern void aclcheck_error_type(AclResult aclerr, Oid typeOid); + +extern void recordExtObjInitPriv(Oid objoid, Oid classoid); +extern void removeExtObjInitPriv(Oid objoid, Oid classoid); + + +/* ownercheck routines just return true (owner) or false (not) */ +extern bool pg_class_ownercheck(Oid class_oid, Oid roleid); +extern bool pg_type_ownercheck(Oid type_oid, Oid roleid); +extern bool pg_oper_ownercheck(Oid oper_oid, Oid roleid); +extern bool pg_proc_ownercheck(Oid proc_oid, Oid roleid); +extern bool pg_language_ownercheck(Oid lan_oid, Oid roleid); +extern bool pg_largeobject_ownercheck(Oid lobj_oid, Oid roleid); +extern bool pg_namespace_ownercheck(Oid nsp_oid, Oid roleid); +extern bool pg_tablespace_ownercheck(Oid spc_oid, Oid roleid); +extern bool pg_opclass_ownercheck(Oid opc_oid, Oid roleid); +extern bool pg_opfamily_ownercheck(Oid opf_oid, Oid roleid); +extern bool pg_database_ownercheck(Oid db_oid, Oid roleid); +extern bool pg_collation_ownercheck(Oid coll_oid, Oid roleid); +extern bool pg_conversion_ownercheck(Oid conv_oid, Oid roleid); +extern bool pg_ts_dict_ownercheck(Oid dict_oid, Oid roleid); +extern bool pg_ts_config_ownercheck(Oid cfg_oid, Oid roleid); +extern bool pg_foreign_data_wrapper_ownercheck(Oid srv_oid, Oid roleid); +extern bool pg_foreign_server_ownercheck(Oid srv_oid, Oid roleid); +extern bool pg_event_trigger_ownercheck(Oid et_oid, Oid roleid); +extern bool pg_extension_ownercheck(Oid ext_oid, Oid roleid); +extern bool pg_publication_ownercheck(Oid pub_oid, Oid roleid); +extern bool pg_subscription_ownercheck(Oid sub_oid, Oid roleid); +extern bool pg_statistics_object_ownercheck(Oid stat_oid, Oid roleid); +extern bool has_createrole_privilege(Oid roleid); +extern bool has_bypassrls_privilege(Oid roleid); + +#endif /* ACL_H */ |