129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/*
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File: acl_check.c
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Copyright (C) 1999, 2000
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Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <errno.h>
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#include "libacl.h"
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#define FAIL_CHECK(error) \
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do { return error; } while (0)
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/*
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Check if an ACL is valid.
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The e_id fields of ACL entries that don't use them are ignored.
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last
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contains the index of the last valid entry found
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after acl_check returns.
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returns
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0 on success, -1 on error, or an ACL_*_ERROR value for invalid ACLs.
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*/
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int
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acl_check(acl_t acl, int *last)
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{
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acl_obj *acl_obj_p = ext2int(acl, acl);
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id_t qual = 0;
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int state = ACL_USER_OBJ;
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acl_entry_obj *entry_obj_p;
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int needs_mask = 0;
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if (!acl_obj_p)
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return -1;
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if (last)
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*last = 0;
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FOREACH_ACL_ENTRY(entry_obj_p, acl_obj_p) {
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/* Check permissions for ~(ACL_READ|ACL_WRITE|ACL_EXECUTE) */
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switch (entry_obj_p->etag) {
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case ACL_USER_OBJ:
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if (state == ACL_USER_OBJ) {
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qual = 0;
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state = ACL_USER;
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break;
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}
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FAIL_CHECK(ACL_MULTI_ERROR);
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case ACL_USER:
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if (state != ACL_USER)
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FAIL_CHECK(ACL_MISS_ERROR);
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if (qualifier_obj_id(entry_obj_p->eid) < qual ||
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qualifier_obj_id(entry_obj_p->eid) ==
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ACL_UNDEFINED_ID)
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FAIL_CHECK(ACL_DUPLICATE_ERROR);
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qual = qualifier_obj_id(entry_obj_p->eid)+1;
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needs_mask = 1;
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break;
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case ACL_GROUP_OBJ:
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if (state == ACL_USER) {
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qual = 0;
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state = ACL_GROUP;
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break;
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}
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if (state >= ACL_GROUP)
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FAIL_CHECK(ACL_MULTI_ERROR);
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FAIL_CHECK(ACL_MISS_ERROR);
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case ACL_GROUP:
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if (state != ACL_GROUP)
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FAIL_CHECK(ACL_MISS_ERROR);
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if (qualifier_obj_id(entry_obj_p->eid) < qual ||
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qualifier_obj_id(entry_obj_p->eid) ==
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ACL_UNDEFINED_ID)
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FAIL_CHECK(ACL_DUPLICATE_ERROR);
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qual = qualifier_obj_id(entry_obj_p->eid)+1;
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needs_mask = 1;
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break;
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case ACL_MASK:
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if (state == ACL_GROUP) {
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state = ACL_OTHER;
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break;
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}
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if (state >= ACL_OTHER)
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FAIL_CHECK(ACL_MULTI_ERROR);
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FAIL_CHECK(ACL_MISS_ERROR);
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case ACL_OTHER:
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if (state == ACL_OTHER ||
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(state == ACL_GROUP && !needs_mask)) {
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state = 0;
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break;
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}
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FAIL_CHECK(ACL_MISS_ERROR);
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default:
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FAIL_CHECK(ACL_ENTRY_ERROR);
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}
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if (last)
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(*last)++;
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}
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if (state != 0)
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FAIL_CHECK(ACL_MISS_ERROR);
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return 0;
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}
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#undef FAIL_CHECK
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