90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/* $KAME: safefile.c,v 1.5 2001/03/05 19:54:06 thorpej Exp $ */
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/*
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* Copyright (C) 2000 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include "plog.h"
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#include "debug.h"
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#include "misc.h"
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#include "safefile.h"
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int
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safefile(path, secret)
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const char *path;
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int secret;
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{
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struct stat s;
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uid_t me;
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/* no setuid */
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if (getuid() != geteuid()) {
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plog(LLV_ERROR, LOCATION, NULL,
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"setuid'ed execution not allowed\n");
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return -1;
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}
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if (stat(path, &s) != 0)
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return -1;
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/* the file must be owned by the running uid */
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me = getuid();
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if (s.st_uid != me) {
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plog(LLV_ERROR, LOCATION, NULL,
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"%s has invalid owner uid\n", path);
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return -1;
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}
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switch (s.st_mode & S_IFMT) {
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case S_IFREG:
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break;
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default:
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plog(LLV_ERROR, LOCATION, NULL,
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"%s is an invalid file type 0x%x\n", path,
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(s.st_mode & S_IFMT));
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return -1;
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}
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/* secret file should not be read by others */
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if (secret) {
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if ((s.st_mode & S_IRWXG) != 0 || (s.st_mode & S_IRWXO) != 0) {
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plog(LLV_ERROR, LOCATION, NULL,
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"%s has weak file permission\n", path);
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return -1;
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}
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}
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return 0;
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}
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