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/* libgcry_common.c
* This file hosts functions both being used by the rsyslog runtime as
* well as tools who do not use the runtime (so we can maintain the
* code at a single place).
*
* Copyright 2013 Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <gcrypt.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "rsyslog.h" /* we need data typedefs */
#include "libgcry.h"
/* read a key from a key file
* @param[out] key - key buffer, must be freed by caller
* @param[out] keylen - length of buffer
* @returns 0 if OK, something else otherwise (we do not use
* iRet as this is also called from non-rsyslog w/o runtime)
* The key length is limited to 64KiB to prevent DoS.
* Note well: key is a blob, not a C string (NUL may be present!)
*/
int
gcryGetKeyFromFile(char *fn, char **key, unsigned *keylen)
{
struct stat sb;
int fd;
int r;
if(stat(fn, &sb) == -1) {
r = 1; goto done;
}
if((sb.st_mode & S_IFMT) != S_IFREG) {
r = 2; goto done;
}
if(sb.st_size > 64*1024) {
r = 3; goto done;
}
if((*key = malloc(sb.st_size)) == NULL) {
r = -1; goto done;
}
if((fd = open(fn, O_RDONLY)) < 0) {
r = 4; goto done;
}
if(read(fd, *key, sb.st_size) != sb.st_size) {
r = 5; goto done;
}
*keylen = sb.st_size;
close(fd);
r = 0;
done: return r;
}
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