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/* Copyright (C) 2007 The Written Word, Inc.
* Copyright (C) 2008, Simon Josefsson
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "libssh2_priv.h"
#ifdef LIBSSH2_LIBGCRYPT /* compile only if we build with libgcrypt */
static int
readline(char *line, int line_size, FILE * fp)
{
if (!fgets(line, line_size, fp)) {
return -1;
}
if (*line && line[strlen(line) - 1] == '\n') {
line[strlen(line) - 1] = '\0';
}
if (*line && line[strlen(line) - 1] == '\r') {
line[strlen(line) - 1] = '\0';
}
return 0;
}
#define LINE_SIZE 128
int
_libssh2_pem_parse(LIBSSH2_SESSION * session,
const char *headerbegin,
const char *headerend,
FILE * fp, unsigned char **data, unsigned int *datalen)
{
char line[LINE_SIZE];
char *b64data = NULL;
unsigned int b64datalen = 0;
int ret;
do {
if (readline(line, LINE_SIZE, fp)) {
return -1;
}
}
while (strcmp(line, headerbegin) != 0);
*line = '\0';
do {
if (*line) {
char *tmp;
size_t linelen;
linelen = strlen(line);
tmp = LIBSSH2_REALLOC(session, b64data, b64datalen + linelen);
if (!tmp) {
ret = -1;
goto out;
}
memcpy(tmp + b64datalen, line, linelen);
b64data = tmp;
b64datalen += linelen;
}
if (readline(line, LINE_SIZE, fp)) {
ret = -1;
goto out;
}
} while (strcmp(line, headerend) != 0);
if (libssh2_base64_decode(session, (char**) data, datalen,
b64data, b64datalen)) {
ret = -1;
goto out;
}
ret = 0;
out:
if (b64data) {
LIBSSH2_FREE(session, b64data);
}
return ret;
}
static int
read_asn1_length(const unsigned char *data,
unsigned int datalen, unsigned int *len)
{
unsigned int lenlen;
int nextpos;
if (datalen < 1) {
return -1;
}
*len = data[0];
if (*len >= 0x80) {
lenlen = *len & 0x7F;
*len = data[1];
if (1 + lenlen > datalen) {
return -1;
}
if (lenlen > 1) {
*len <<= 8;
*len |= data[2];
}
} else {
lenlen = 0;
}
nextpos = 1 + lenlen;
if (lenlen > 2 || 1 + lenlen + *len > datalen) {
return -1;
}
return nextpos;
}
int
_libssh2_pem_decode_sequence(unsigned char **data, unsigned int *datalen)
{
unsigned int len;
int lenlen;
if (*datalen < 1) {
return -1;
}
if ((*data)[0] != '\x30') {
return -1;
}
(*data)++;
(*datalen)--;
lenlen = read_asn1_length(*data, *datalen, &len);
if (lenlen < 0 || lenlen + len != *datalen) {
return -1;
}
*data += lenlen;
*datalen -= lenlen;
return 0;
}
int
_libssh2_pem_decode_integer(unsigned char **data, unsigned int *datalen,
unsigned char **i, unsigned int *ilen)
{
unsigned int len;
int lenlen;
if (*datalen < 1) {
return -1;
}
if ((*data)[0] != '\x02') {
return -1;
}
(*data)++;
(*datalen)--;
lenlen = read_asn1_length(*data, *datalen, &len);
if (lenlen < 0 || lenlen + len > *datalen) {
return -1;
}
*data += lenlen;
*datalen -= lenlen;
*i = *data;
*ilen = len;
*data += len;
*datalen -= len;
return 0;
}
#endif /* LIBSSH2_LIBGCRYPT */
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