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.
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 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: os.c,v 1.10 2007-06-19 23:46:59 tbox Exp $ */
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/*! \file */
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#include <config.h>
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#include <rndc/os.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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int
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set_user(FILE *fd, const char *user) {
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struct passwd *pw;
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pw = getpwnam(user);
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if (pw == NULL) {
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errno = EINVAL;
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return (-1);
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}
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return (fchown(fileno(fd), pw->pw_uid, -1));
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}
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FILE *
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safe_create(const char *filename) {
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int fd;
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FILE *f;
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struct stat sb;
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int flags = O_WRONLY;
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if (stat(filename, &sb) == -1) {
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if (errno != ENOENT)
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return (NULL);
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flags = O_WRONLY | O_CREAT | O_EXCL;
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} else if ((sb.st_mode & S_IFREG) == 0) {
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errno = EOPNOTSUPP;
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return (NULL);
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} else
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flags = O_WRONLY | O_TRUNC;
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fd = open(filename, flags, S_IRUSR | S_IWUSR);
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if (fd == -1)
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return (NULL);
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f = fdopen(fd, "w");
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if (f == NULL)
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close(fd);
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return (f);
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}
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