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37bb75f740
1. Very large RRSIG RRsets included in a negative cache can trigger an assertion failure that will crash named (BIND 9 DNS) due to an off-by-one error in a buffer size check. This bug affects all resolving name servers, whether DNSSEC validation is enabled or not, on all BIND versions prior to today. There is a possibility of malicious exploitation of this bug by remote users. 2. Named could fail to validate zones listed in a DLV that validated insecure without using DLV and had DS records in the parent zone. Add a patch provided by ru@ and confirmed by ISC to fix a crash at shutdown time when a SIG(0) key is being used.
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/*
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* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: fsaccess.c,v 1.10 2007-06-19 23:47:17 tbox Exp $ */
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/*! \file
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* \brief
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* This file contains the OS-independent functionality of the API.
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*/
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#include <isc/fsaccess.h>
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#include <isc/result.h>
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#include <isc/util.h>
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/*!
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* Shorthand. Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in
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* <isc/fsaccess.h>. Could check consistency with sizeof(isc_fsaccess_t)
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* and the number of bits in each function.
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*/
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#define STEP (ISC__FSACCESS_PERMISSIONBITS)
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#define GROUP (STEP)
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#define OTHER (STEP * 2)
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void
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isc_fsaccess_add(int trustee, int permission, isc_fsaccess_t *access) {
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REQUIRE(trustee <= 0x7);
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REQUIRE(permission <= 0xFF);
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if ((trustee & ISC_FSACCESS_OWNER) != 0)
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*access |= permission;
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if ((trustee & ISC_FSACCESS_GROUP) != 0)
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*access |= (permission << GROUP);
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if ((trustee & ISC_FSACCESS_OTHER) != 0)
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*access |= (permission << OTHER);
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}
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void
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isc_fsaccess_remove(int trustee, int permission, isc_fsaccess_t *access) {
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REQUIRE(trustee <= 0x7);
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REQUIRE(permission <= 0xFF);
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if ((trustee & ISC_FSACCESS_OWNER) != 0)
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*access &= ~permission;
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if ((trustee & ISC_FSACCESS_GROUP) != 0)
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*access &= ~(permission << GROUP);
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if ((trustee & ISC_FSACCESS_OTHER) != 0)
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*access &= ~(permission << OTHER);
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}
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static isc_result_t
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check_bad_bits(isc_fsaccess_t access, isc_boolean_t is_dir) {
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isc_fsaccess_t bits;
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/*
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* Check for disallowed user bits.
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*/
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if (is_dir)
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bits = ISC_FSACCESS_READ |
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ISC_FSACCESS_WRITE |
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ISC_FSACCESS_EXECUTE;
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else
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bits = ISC_FSACCESS_CREATECHILD |
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ISC_FSACCESS_ACCESSCHILD |
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ISC_FSACCESS_DELETECHILD |
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ISC_FSACCESS_LISTDIRECTORY;
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/*
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* Set group bad bits.
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*/
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bits |= bits << STEP;
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/*
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* Set other bad bits.
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*/
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bits |= bits << STEP;
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if ((access & bits) != 0) {
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if (is_dir)
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return (ISC_R_NOTFILE);
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else
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return (ISC_R_NOTDIRECTORY);
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}
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return (ISC_R_SUCCESS);
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}
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