acl.h
上传用户:blenddy
上传日期:2007-01-07
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文件大小:5k
- /*-------------------------------------------------------------------------
- *
- * acl.h
- * Definition of (and support for) access control list data structures.
- *
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- * $Id: acl.h,v 1.20.2.1 1999/07/30 17:07:22 scrappy Exp $
- *
- * NOTES
- * For backward-compatability purposes we have to allow there
- * to be a null ACL in a pg_class tuple. This will be defined as
- * meaning "no protection" (i.e., old catalogs get old semantics).
- *
- * 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 /* XXX only idtype should be checked */
- /*
- * 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
- #define ACL_MODECHG_ADD 1
- #define ACL_MODECHG_DEL 2
- #define ACL_MODECHG_EQL 3
- /* change this line if you want to set the default acl permission */
- #define ACL_WORLD_DEFAULT (ACL_NO)
- /* #define ACL_WORLD_DEFAULT (ACL_RD|ACL_WR|ACL_AP|ACL_RU) */
- #define ACL_OWNER_DEFAULT (ACL_RD|ACL_WR|ACL_AP|ACL_RU)
- /*
- * 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
- * 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 */
- /*
- * The value of the first dimension-array element. Since these arrays
- * always have a lower-bound of 0, this is the same as the number of
- * elements in the array.
- */
- #define ARR_DIM0(a) (((unsigned *) (((char *) a) + sizeof(ArrayType)))[0])
- /*
- * Acl a one-dimensional POSTGRES array of AclItem
- */
- typedef ArrayType Acl;
- #define ACL_NUM(ACL) ARR_DIM0(ACL)
- #define ACL_DAT(ACL) ((AclItem *) ARR_DATA_PTR(ACL))
- #define ACL_N_SIZE(N)
- ((unsigned) (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_DIM0(IDL)
- #define IDLIST_DAT(IDL) ((AclId *) ARR_DATA_PTR(IDL))
- #define IDLIST_N_SIZE(N)
- ((unsigned) (ARR_OVERHEAD(1) + ((N) * sizeof(AclId))))
- #define IDLIST_SIZE(IDL) ARR_SIZE(IDL)
- #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 (parser, etc.)
- */
- extern Acl *aclownerdefault(char *relname, AclId ownerid);
- extern Acl *acldefault(char *relname);
- extern Acl *aclinsert3(Acl *old_acl, AclItem *mod_aip, unsigned modechg);
- 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 AclItem *aclitemin(char *s);
- extern char *aclitemout(AclItem *aip);
- extern Acl *aclinsert(Acl *old_acl, AclItem *mod_aip);
- extern Acl *aclremove(Acl *old_acl, AclItem *mod_aip);
- extern int32 aclcontains(Acl *acl, AclItem *aip);
- /*
- * 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, char *usename, AclMode mode);
- extern int32 pg_ownercheck(char *usename, char *value, int cacheid);
- extern int32 pg_func_ownercheck(char *usename, char *funcname,
- int nargs, Oid *arglist);
- extern int32 pg_aggr_ownercheck(char *usename, char *aggname,
- Oid basetypeID);
- #endif /* ACL_H */