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/*-------------------------------------------------------------------------
*
* acl.h
* Definition of (and support for) access control list data structures.
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: acl.h,v 1.29 2000/10/07 00:58:23 tgl Exp $
*
* NOTES
* For backward-compatibility purposes we have to allow there
* to be a null ACL in a pg_class tuple. This will be defined as
* meaning "default protection" (i.e., whatever acldefault() returns).
*
* The AclItems in an ACL array are currently kept in sorted order.
* Things will break hard if you change that without changing the
* code wherever this is included.
*-------------------------------------------------------------------------
*/
#ifndef ACL_H
#define ACL_H
#include "nodes/parsenodes.h"
#include "utils/array.h"
#include "utils/memutils.h"
/*
* AclId system identifier for the user, group, etc.
* XXX currently UNIX uid for users...
*/
typedef uint32 AclId;
#define ACL_ID_WORLD 0 /* placeholder for id in a WORLD acl item */
/*
* AclIdType tag that describes if the AclId is a user, group, etc.
*/
typedef uint8 AclIdType;
#define ACL_IDTYPE_WORLD 0x00
#define ACL_IDTYPE_UID 0x01 /* user id - from pg_shadow */
#define ACL_IDTYPE_GID 0x02 /* group id - from pg_group */
/*
* AclMode the actual permissions
* XXX should probably use bit.h routines.
* XXX should probably also stuff the modechg cruft in the
* high bits, too.
*/
typedef uint8 AclMode;
#define ACL_NO 0 /* no permissions */
#define ACL_AP (1<<0) /* append */
#define ACL_RD (1<<1) /* read */
#define ACL_WR (1<<2) /* write (append/delete/replace) */
#define ACL_RU (1<<3) /* place rules */
#define N_ACL_MODES 4
/*
* AclItem
*/
typedef struct AclItem
{
AclId ai_id;
AclIdType ai_idtype;
AclMode ai_mode;
/*
* This is actually type 'aclitem', and we want a fixed size for
* all platforms, so we pad this with dummies.
*/
char dummy1,
dummy2;
} AclItem;
/* Note: if the size of AclItem changes,
change the aclitem typlen in pg_type.h */
/*
* Definitions for convenient access to Acl (array of AclItem) and IdList
* (array of AclId). These are standard Postgres arrays, but are restricted
* to have one dimension. We also ignore the lower bound when reading,
* and set it to zero when writing.
*
* CAUTION: as of Postgres 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. Presently, we do not provide toast tables for
* pg_class or pg_group, so the entries in those tables won't have been
* stored externally --- but they could have been compressed!
*/
/*
* Acl a one-dimensional POSTGRES array of AclItem
*/
typedef 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(1) + ((N) * sizeof(AclItem)))
#define ACL_SIZE(ACL) ARR_SIZE(ACL)
/*
* IdList a one-dimensional POSTGRES array of AclId
*/
typedef ArrayType IdList;
#define IDLIST_NUM(IDL) (ARR_DIMS(IDL)[0])
#define IDLIST_DAT(IDL) ((AclId *) ARR_DATA_PTR(IDL))
#define IDLIST_N_SIZE(N) (ARR_OVERHEAD(1) + ((N) * sizeof(AclId)))
#define IDLIST_SIZE(IDL) ARR_SIZE(IDL)
/*
* 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)
#define DatumGetIdListP(X) ((IdList *) PG_DETOAST_DATUM(X))
#define DatumGetIdListPCopy(X) ((IdList *) PG_DETOAST_DATUM_COPY(X))
#define PG_GETARG_IDLIST_P(n) DatumGetIdListP(PG_GETARG_DATUM(n))
#define PG_GETARG_IDLIST_P_COPY(n) DatumGetIdListPCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_IDLIST_P(x) PG_RETURN_POINTER(x)
/*
* ACL modification opcodes
*/
#define ACL_MODECHG_ADD 1
#define ACL_MODECHG_DEL 2
#define ACL_MODECHG_EQL 3
/* mode indicators for I/O */
#define ACL_MODECHG_STR "+-=" /* list of valid characters */
#define ACL_MODECHG_ADD_CHR '+'
#define ACL_MODECHG_DEL_CHR '-'
#define ACL_MODECHG_EQL_CHR '='
#define ACL_MODE_STR "arwR" /* list of valid characters */
#define ACL_MODE_AP_CHR 'a'
#define ACL_MODE_RD_CHR 'r'
#define ACL_MODE_WR_CHR 'w'
#define ACL_MODE_RU_CHR 'R'
/* result codes for pg_aclcheck */
#define ACLCHECK_OK 0
#define ACLCHECK_NO_PRIV 1
#define ACLCHECK_NO_CLASS 2
#define ACLCHECK_NOT_OWNER 3
/* warning messages. set these in aclchk.c. */
extern char *aclcheck_error_strings[];
/*
* Enable ACL execution tracing and table dumps
*/
/*#define ACLDEBUG_TRACE*/
/*
* routines used internally
*/
extern Acl *acldefault(char *relname, AclId ownerid);
extern Acl *aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg);
/*
* routines used by the parser
*/
extern char *aclmakepriv(char *old_privlist, char new_priv);
extern char *aclmakeuser(char *user_type, char *user);
extern ChangeACLStmt *makeAclStmt(char *privs, List *rel_list, char *grantee,
char grant_or_revoke);
/*
* exported routines (from acl.c)
*/
extern Acl *makeacl(int n);
extern Datum aclitemin(PG_FUNCTION_ARGS);
extern Datum aclitemout(PG_FUNCTION_ARGS);
extern Datum aclinsert(PG_FUNCTION_ARGS);
extern Datum aclremove(PG_FUNCTION_ARGS);
extern Datum aclcontains(PG_FUNCTION_ARGS);
extern void ExecuteChangeACLStmt(ChangeACLStmt *stmt);
/*
* prototypes for functions in aclchk.c
*/
extern void ChangeAcl(char *relname, AclItem *mod_aip, unsigned modechg);
extern AclId get_grosysid(char *groname);
extern char *get_groname(AclId grosysid);
extern int32 pg_aclcheck(char *relname, Oid userid, AclMode mode);
extern int32 pg_ownercheck(Oid userid, const char *value, int cacheid);
extern int32 pg_func_ownercheck(Oid userid, char *funcname,
int nargs, Oid *arglist);
extern int32 pg_aggr_ownercheck(Oid userid, char *aggname,
Oid basetypeID);
#endif /* ACL_H */
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