313 lines
13 KiB
C
313 lines
13 KiB
C
/*-------------------------------------------------------------------------
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*
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* acl.h
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* Definition of (and support for) access control list data structures.
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*
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/acl.h
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*
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* NOTES
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* An ACL array is simply an array of AclItems, representing the union
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* of the privileges represented by the individual items. A zero-length
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* array represents "no privileges".
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*
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* The order of items in the array is important as client utilities (in
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* particular, pg_dump, though possibly other clients) expect to be able
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* to issue GRANTs in the ordering of the items in the array. The reason
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* this matters is that GRANTs WITH GRANT OPTION must be before any GRANTs
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* which depend on it. This happens naturally in the backend during
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* operations as we update ACLs in-place, new items are appended, and
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* existing entries are only removed if there's no dependency on them (no
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* GRANT can been based on it, or, if there was, those GRANTs are also
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* removed).
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*
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* For backward-compatibility purposes we have to allow null ACL entries
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* in system catalogs. A null ACL will be treated as meaning "default
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* protection" (i.e., whatever acldefault() returns).
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*-------------------------------------------------------------------------
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*/
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#ifndef ACL_H
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#define ACL_H
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#include "access/htup.h"
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#include "nodes/parsenodes.h"
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#include "parser/parse_node.h"
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#include "utils/snapshot.h"
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/*
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* typedef AclMode is declared in parsenodes.h, also the individual privilege
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* bit meanings are defined there
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*/
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#define ACL_ID_PUBLIC 0 /* placeholder for id in a PUBLIC acl item */
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/*
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* AclItem
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*
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* Note: must be same size on all platforms, because the size is hardcoded
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* in the pg_type.h entry for aclitem.
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*/
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typedef struct AclItem
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{
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Oid ai_grantee; /* ID that this item grants privs to */
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Oid ai_grantor; /* grantor of privs */
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AclMode ai_privs; /* privilege bits */
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} AclItem;
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/*
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* The upper 16 bits of the ai_privs field of an AclItem are the grant option
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* bits, and the lower 16 bits are the actual privileges. We use "rights"
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* to mean the combined grant option and privilege bits fields.
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*/
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#define ACLITEM_GET_PRIVS(item) ((item).ai_privs & 0xFFFF)
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#define ACLITEM_GET_GOPTIONS(item) (((item).ai_privs >> 16) & 0xFFFF)
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#define ACLITEM_GET_RIGHTS(item) ((item).ai_privs)
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#define ACL_GRANT_OPTION_FOR(privs) (((AclMode) (privs) & 0xFFFF) << 16)
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#define ACL_OPTION_TO_PRIVS(privs) (((AclMode) (privs) >> 16) & 0xFFFF)
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#define ACLITEM_SET_PRIVS(item,privs) \
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((item).ai_privs = ((item).ai_privs & ~((AclMode) 0xFFFF)) | \
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((AclMode) (privs) & 0xFFFF))
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#define ACLITEM_SET_GOPTIONS(item,goptions) \
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((item).ai_privs = ((item).ai_privs & ~(((AclMode) 0xFFFF) << 16)) | \
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(((AclMode) (goptions) & 0xFFFF) << 16))
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#define ACLITEM_SET_RIGHTS(item,rights) \
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((item).ai_privs = (AclMode) (rights))
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#define ACLITEM_SET_PRIVS_GOPTIONS(item,privs,goptions) \
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((item).ai_privs = ((AclMode) (privs) & 0xFFFF) | \
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(((AclMode) (goptions) & 0xFFFF) << 16))
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#define ACLITEM_ALL_PRIV_BITS ((AclMode) 0xFFFF)
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#define ACLITEM_ALL_GOPTION_BITS ((AclMode) 0xFFFF << 16)
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/*
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* Definitions for convenient access to Acl (array of AclItem).
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* These are standard PostgreSQL arrays, but are restricted to have one
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* dimension and no nulls. We also ignore the lower bound when reading,
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* and set it to one when writing.
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*
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* CAUTION: as of PostgreSQL 7.1, these arrays are toastable (just like all
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* other array types). Therefore, be careful to detoast them with the
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* macros provided, unless you know for certain that a particular array
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* can't have been toasted.
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*/
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/*
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* Acl a one-dimensional array of AclItem
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*/
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typedef struct ArrayType Acl;
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#define ACL_NUM(ACL) (ARR_DIMS(ACL)[0])
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#define ACL_DAT(ACL) ((AclItem *) ARR_DATA_PTR(ACL))
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#define ACL_N_SIZE(N) (ARR_OVERHEAD_NONULLS(1) + ((N) * sizeof(AclItem)))
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#define ACL_SIZE(ACL) ARR_SIZE(ACL)
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/*
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* fmgr macros for these types
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*/
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#define DatumGetAclItemP(X) ((AclItem *) DatumGetPointer(X))
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#define PG_GETARG_ACLITEM_P(n) DatumGetAclItemP(PG_GETARG_DATUM(n))
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#define PG_RETURN_ACLITEM_P(x) PG_RETURN_POINTER(x)
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#define DatumGetAclP(X) ((Acl *) PG_DETOAST_DATUM(X))
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#define DatumGetAclPCopy(X) ((Acl *) PG_DETOAST_DATUM_COPY(X))
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#define PG_GETARG_ACL_P(n) DatumGetAclP(PG_GETARG_DATUM(n))
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#define PG_GETARG_ACL_P_COPY(n) DatumGetAclPCopy(PG_GETARG_DATUM(n))
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#define PG_RETURN_ACL_P(x) PG_RETURN_POINTER(x)
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/*
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* ACL modification opcodes for aclupdate
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*/
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#define ACL_MODECHG_ADD 1
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#define ACL_MODECHG_DEL 2
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#define ACL_MODECHG_EQL 3
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/*
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* External representations of the privilege bits --- aclitemin/aclitemout
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* represent each possible privilege bit with a distinct 1-character code
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*/
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#define ACL_INSERT_CHR 'a' /* formerly known as "append" */
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#define ACL_SELECT_CHR 'r' /* formerly known as "read" */
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#define ACL_UPDATE_CHR 'w' /* formerly known as "write" */
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#define ACL_DELETE_CHR 'd'
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#define ACL_TRUNCATE_CHR 'D' /* super-delete, as it were */
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#define ACL_REFERENCES_CHR 'x'
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#define ACL_TRIGGER_CHR 't'
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#define ACL_EXECUTE_CHR 'X'
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#define ACL_USAGE_CHR 'U'
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#define ACL_CREATE_CHR 'C'
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#define ACL_CREATE_TEMP_CHR 'T'
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#define ACL_CONNECT_CHR 'c'
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/* string holding all privilege code chars, in order by bitmask position */
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#define ACL_ALL_RIGHTS_STR "arwdDxtXUCTc"
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/*
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* Bitmasks defining "all rights" for each supported object type
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*/
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#define ACL_ALL_RIGHTS_COLUMN (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_REFERENCES)
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#define ACL_ALL_RIGHTS_RELATION (ACL_INSERT|ACL_SELECT|ACL_UPDATE|ACL_DELETE|ACL_TRUNCATE|ACL_REFERENCES|ACL_TRIGGER)
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#define ACL_ALL_RIGHTS_SEQUENCE (ACL_USAGE|ACL_SELECT|ACL_UPDATE)
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#define ACL_ALL_RIGHTS_DATABASE (ACL_CREATE|ACL_CREATE_TEMP|ACL_CONNECT)
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#define ACL_ALL_RIGHTS_FDW (ACL_USAGE)
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#define ACL_ALL_RIGHTS_FOREIGN_SERVER (ACL_USAGE)
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#define ACL_ALL_RIGHTS_FUNCTION (ACL_EXECUTE)
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#define ACL_ALL_RIGHTS_LANGUAGE (ACL_USAGE)
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#define ACL_ALL_RIGHTS_LARGEOBJECT (ACL_SELECT|ACL_UPDATE)
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#define ACL_ALL_RIGHTS_SCHEMA (ACL_USAGE|ACL_CREATE)
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#define ACL_ALL_RIGHTS_TABLESPACE (ACL_CREATE)
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#define ACL_ALL_RIGHTS_TYPE (ACL_USAGE)
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/* operation codes for pg_*_aclmask */
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typedef enum
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{
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ACLMASK_ALL, /* normal case: compute all bits */
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ACLMASK_ANY /* return when result is known nonzero */
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} AclMaskHow;
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/* result codes for pg_*_aclcheck */
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typedef enum
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{
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ACLCHECK_OK = 0,
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ACLCHECK_NO_PRIV,
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ACLCHECK_NOT_OWNER
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} AclResult;
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/*
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* routines used internally
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*/
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extern Acl *acldefault(ObjectType objtype, Oid ownerId);
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extern Acl *get_user_default_acl(ObjectType objtype, Oid ownerId,
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Oid nsp_oid);
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extern void recordDependencyOnNewAcl(Oid classId, Oid objectId, int32 objsubId,
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Oid ownerId, Acl *acl);
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extern Acl *aclupdate(const Acl *old_acl, const AclItem *mod_aip,
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int modechg, Oid ownerId, DropBehavior behavior);
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extern Acl *aclnewowner(const Acl *old_acl, Oid oldOwnerId, Oid newOwnerId);
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extern Acl *make_empty_acl(void);
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extern Acl *aclcopy(const Acl *orig_acl);
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extern Acl *aclconcat(const Acl *left_acl, const Acl *right_acl);
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extern Acl *aclmerge(const Acl *left_acl, const Acl *right_acl, Oid ownerId);
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extern void aclitemsort(Acl *acl);
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extern bool aclequal(const Acl *left_acl, const Acl *right_acl);
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extern AclMode aclmask(const Acl *acl, Oid roleid, Oid ownerId,
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AclMode mask, AclMaskHow how);
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extern int aclmembers(const Acl *acl, Oid **roleids);
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extern bool has_privs_of_role(Oid member, Oid role);
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extern bool is_member_of_role(Oid member, Oid role);
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extern bool is_member_of_role_nosuper(Oid member, Oid role);
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extern bool is_admin_of_role(Oid member, Oid role);
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extern void check_is_member_of_role(Oid member, Oid role);
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extern Oid get_role_oid(const char *rolename, bool missing_ok);
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extern Oid get_role_oid_or_public(const char *rolename);
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extern Oid get_rolespec_oid(const RoleSpec *role, bool missing_ok);
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extern void check_rolespec_name(const RoleSpec *role, const char *detail_msg);
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extern HeapTuple get_rolespec_tuple(const RoleSpec *role);
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extern char *get_rolespec_name(const RoleSpec *role);
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extern void select_best_grantor(Oid roleId, AclMode privileges,
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const Acl *acl, Oid ownerId,
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Oid *grantorId, AclMode *grantOptions);
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extern void initialize_acl(void);
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/*
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* prototypes for functions in aclchk.c
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*/
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extern void ExecuteGrantStmt(GrantStmt *stmt);
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extern void ExecAlterDefaultPrivilegesStmt(ParseState *pstate, AlterDefaultPrivilegesStmt *stmt);
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extern void RemoveRoleFromObjectACL(Oid roleid, Oid classid, Oid objid);
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extern void RemoveDefaultACLById(Oid defaclOid);
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extern AclMode pg_attribute_aclmask(Oid table_oid, AttrNumber attnum,
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Oid roleid, AclMode mask, AclMaskHow how);
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extern AclMode pg_class_aclmask(Oid table_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_database_aclmask(Oid db_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_proc_aclmask(Oid proc_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_language_aclmask(Oid lang_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_largeobject_aclmask_snapshot(Oid lobj_oid, Oid roleid,
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AclMode mask, AclMaskHow how, Snapshot snapshot);
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extern AclMode pg_namespace_aclmask(Oid nsp_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_tablespace_aclmask(Oid spc_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_foreign_data_wrapper_aclmask(Oid fdw_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_foreign_server_aclmask(Oid srv_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclMode pg_type_aclmask(Oid type_oid, Oid roleid,
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AclMode mask, AclMaskHow how);
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extern AclResult pg_attribute_aclcheck(Oid table_oid, AttrNumber attnum,
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Oid roleid, AclMode mode);
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extern AclResult pg_attribute_aclcheck_all(Oid table_oid, Oid roleid,
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AclMode mode, AclMaskHow how);
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extern AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode);
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extern AclResult pg_database_aclcheck(Oid db_oid, Oid roleid, AclMode mode);
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extern AclResult pg_proc_aclcheck(Oid proc_oid, Oid roleid, AclMode mode);
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extern AclResult pg_language_aclcheck(Oid lang_oid, Oid roleid, AclMode mode);
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extern AclResult pg_largeobject_aclcheck_snapshot(Oid lang_oid, Oid roleid,
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AclMode mode, Snapshot snapshot);
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extern AclResult pg_namespace_aclcheck(Oid nsp_oid, Oid roleid, AclMode mode);
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extern AclResult pg_tablespace_aclcheck(Oid spc_oid, Oid roleid, AclMode mode);
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extern AclResult pg_foreign_data_wrapper_aclcheck(Oid fdw_oid, Oid roleid, AclMode mode);
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extern AclResult pg_foreign_server_aclcheck(Oid srv_oid, Oid roleid, AclMode mode);
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extern AclResult pg_type_aclcheck(Oid type_oid, Oid roleid, AclMode mode);
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extern void aclcheck_error(AclResult aclerr, ObjectType objtype,
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const char *objectname);
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extern void aclcheck_error_col(AclResult aclerr, ObjectType objtype,
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const char *objectname, const char *colname);
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extern void aclcheck_error_type(AclResult aclerr, Oid typeOid);
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extern void recordExtObjInitPriv(Oid objoid, Oid classoid);
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extern void removeExtObjInitPriv(Oid objoid, Oid classoid);
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/* ownercheck routines just return true (owner) or false (not) */
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extern bool pg_class_ownercheck(Oid class_oid, Oid roleid);
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extern bool pg_type_ownercheck(Oid type_oid, Oid roleid);
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extern bool pg_oper_ownercheck(Oid oper_oid, Oid roleid);
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extern bool pg_proc_ownercheck(Oid proc_oid, Oid roleid);
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extern bool pg_language_ownercheck(Oid lan_oid, Oid roleid);
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extern bool pg_largeobject_ownercheck(Oid lobj_oid, Oid roleid);
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extern bool pg_namespace_ownercheck(Oid nsp_oid, Oid roleid);
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extern bool pg_tablespace_ownercheck(Oid spc_oid, Oid roleid);
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extern bool pg_opclass_ownercheck(Oid opc_oid, Oid roleid);
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extern bool pg_opfamily_ownercheck(Oid opf_oid, Oid roleid);
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extern bool pg_database_ownercheck(Oid db_oid, Oid roleid);
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extern bool pg_collation_ownercheck(Oid coll_oid, Oid roleid);
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extern bool pg_conversion_ownercheck(Oid conv_oid, Oid roleid);
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extern bool pg_ts_dict_ownercheck(Oid dict_oid, Oid roleid);
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extern bool pg_ts_config_ownercheck(Oid cfg_oid, Oid roleid);
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extern bool pg_foreign_data_wrapper_ownercheck(Oid srv_oid, Oid roleid);
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extern bool pg_foreign_server_ownercheck(Oid srv_oid, Oid roleid);
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extern bool pg_event_trigger_ownercheck(Oid et_oid, Oid roleid);
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extern bool pg_extension_ownercheck(Oid ext_oid, Oid roleid);
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extern bool pg_publication_ownercheck(Oid pub_oid, Oid roleid);
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extern bool pg_subscription_ownercheck(Oid sub_oid, Oid roleid);
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extern bool pg_statistics_object_ownercheck(Oid stat_oid, Oid roleid);
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extern bool has_createrole_privilege(Oid roleid);
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extern bool has_bypassrls_privilege(Oid roleid);
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#endif /* ACL_H */
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