418 lines
9.6 KiB
C
418 lines
9.6 KiB
C
/*
|
|
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <limits.h>
|
|
#include "internal/cryptlib.h"
|
|
#include <openssl/asn1.h>
|
|
#include "asn1_local.h"
|
|
|
|
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
|
|
long max);
|
|
static void asn1_put_length(unsigned char **pp, int length);
|
|
|
|
static int _asn1_check_infinite_end(const unsigned char **p, long len)
|
|
{
|
|
/*
|
|
* If there is 0 or 1 byte left, the length check should pick things up
|
|
*/
|
|
if (len <= 0)
|
|
return 1;
|
|
else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
|
|
(*p) += 2;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ASN1_check_infinite_end(unsigned char **p, long len)
|
|
{
|
|
return _asn1_check_infinite_end((const unsigned char **)p, len);
|
|
}
|
|
|
|
int ASN1_const_check_infinite_end(const unsigned char **p, long len)
|
|
{
|
|
return _asn1_check_infinite_end(p, len);
|
|
}
|
|
|
|
int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
|
|
int *pclass, long omax)
|
|
{
|
|
int i, ret;
|
|
long l;
|
|
const unsigned char *p = *pp;
|
|
int tag, xclass, inf;
|
|
long max = omax;
|
|
|
|
if (!max)
|
|
goto err;
|
|
ret = (*p & V_ASN1_CONSTRUCTED);
|
|
xclass = (*p & V_ASN1_PRIVATE);
|
|
i = *p & V_ASN1_PRIMITIVE_TAG;
|
|
if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
|
|
p++;
|
|
if (--max == 0)
|
|
goto err;
|
|
l = 0;
|
|
while (*p & 0x80) {
|
|
l <<= 7L;
|
|
l |= *(p++) & 0x7f;
|
|
if (--max == 0)
|
|
goto err;
|
|
if (l > (INT_MAX >> 7L))
|
|
goto err;
|
|
}
|
|
l <<= 7L;
|
|
l |= *(p++) & 0x7f;
|
|
tag = (int)l;
|
|
if (--max == 0)
|
|
goto err;
|
|
} else {
|
|
tag = i;
|
|
p++;
|
|
if (--max == 0)
|
|
goto err;
|
|
}
|
|
*ptag = tag;
|
|
*pclass = xclass;
|
|
if (!asn1_get_length(&p, &inf, plength, max))
|
|
goto err;
|
|
|
|
if (inf && !(ret & V_ASN1_CONSTRUCTED))
|
|
goto err;
|
|
|
|
if (*plength > (omax - (p - *pp))) {
|
|
ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
|
|
/*
|
|
* Set this so that even if things are not long enough the values are
|
|
* set correctly
|
|
*/
|
|
ret |= 0x80;
|
|
}
|
|
*pp = p;
|
|
return ret | inf;
|
|
err:
|
|
ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
|
|
return 0x80;
|
|
}
|
|
|
|
/*
|
|
* Decode a length field.
|
|
* The short form is a single byte defining a length 0 - 127.
|
|
* The long form is a byte 0 - 127 with the top bit set and this indicates
|
|
* the number of following octets that contain the length. These octets
|
|
* are stored most significant digit first.
|
|
*/
|
|
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
|
|
long max)
|
|
{
|
|
const unsigned char *p = *pp;
|
|
unsigned long ret = 0;
|
|
int i;
|
|
|
|
if (max-- < 1)
|
|
return 0;
|
|
if (*p == 0x80) {
|
|
*inf = 1;
|
|
p++;
|
|
} else {
|
|
*inf = 0;
|
|
i = *p & 0x7f;
|
|
if (*p++ & 0x80) {
|
|
if (max < i + 1)
|
|
return 0;
|
|
/* Skip leading zeroes */
|
|
while (i > 0 && *p == 0) {
|
|
p++;
|
|
i--;
|
|
}
|
|
if (i > (int)sizeof(long))
|
|
return 0;
|
|
while (i > 0) {
|
|
ret <<= 8;
|
|
ret |= *p++;
|
|
i--;
|
|
}
|
|
if (ret > LONG_MAX)
|
|
return 0;
|
|
} else
|
|
ret = i;
|
|
}
|
|
*pp = p;
|
|
*rl = (long)ret;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* class 0 is constructed constructed == 2 for indefinite length constructed
|
|
*/
|
|
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
|
|
int xclass)
|
|
{
|
|
unsigned char *p = *pp;
|
|
int i, ttag;
|
|
|
|
i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
|
|
i |= (xclass & V_ASN1_PRIVATE);
|
|
if (tag < 31)
|
|
*(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
|
|
else {
|
|
*(p++) = i | V_ASN1_PRIMITIVE_TAG;
|
|
for (i = 0, ttag = tag; ttag > 0; i++)
|
|
ttag >>= 7;
|
|
ttag = i;
|
|
while (i-- > 0) {
|
|
p[i] = tag & 0x7f;
|
|
if (i != (ttag - 1))
|
|
p[i] |= 0x80;
|
|
tag >>= 7;
|
|
}
|
|
p += ttag;
|
|
}
|
|
if (constructed == 2)
|
|
*(p++) = 0x80;
|
|
else
|
|
asn1_put_length(&p, length);
|
|
*pp = p;
|
|
}
|
|
|
|
int ASN1_put_eoc(unsigned char **pp)
|
|
{
|
|
unsigned char *p = *pp;
|
|
*p++ = 0;
|
|
*p++ = 0;
|
|
*pp = p;
|
|
return 2;
|
|
}
|
|
|
|
static void asn1_put_length(unsigned char **pp, int length)
|
|
{
|
|
unsigned char *p = *pp;
|
|
int i, l;
|
|
if (length <= 127)
|
|
*(p++) = (unsigned char)length;
|
|
else {
|
|
l = length;
|
|
for (i = 0; l > 0; i++)
|
|
l >>= 8;
|
|
*(p++) = i | 0x80;
|
|
l = i;
|
|
while (i-- > 0) {
|
|
p[i] = length & 0xff;
|
|
length >>= 8;
|
|
}
|
|
p += l;
|
|
}
|
|
*pp = p;
|
|
}
|
|
|
|
int ASN1_object_size(int constructed, int length, int tag)
|
|
{
|
|
int ret = 1;
|
|
if (length < 0)
|
|
return -1;
|
|
if (tag >= 31) {
|
|
while (tag > 0) {
|
|
tag >>= 7;
|
|
ret++;
|
|
}
|
|
}
|
|
if (constructed == 2) {
|
|
ret += 3;
|
|
} else {
|
|
ret++;
|
|
if (length > 127) {
|
|
int tmplen = length;
|
|
while (tmplen > 0) {
|
|
tmplen >>= 8;
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
if (ret >= INT_MAX - length)
|
|
return -1;
|
|
return ret + length;
|
|
}
|
|
|
|
int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
|
|
{
|
|
if (str == NULL)
|
|
return 0;
|
|
dst->type = str->type;
|
|
if (!ASN1_STRING_set(dst, str->data, str->length))
|
|
return 0;
|
|
/* Copy flags but preserve embed value */
|
|
dst->flags &= ASN1_STRING_FLAG_EMBED;
|
|
dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
|
|
return 1;
|
|
}
|
|
|
|
ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
|
|
{
|
|
ASN1_STRING *ret;
|
|
if (!str)
|
|
return NULL;
|
|
ret = ASN1_STRING_new();
|
|
if (ret == NULL)
|
|
return NULL;
|
|
if (!ASN1_STRING_copy(ret, str)) {
|
|
ASN1_STRING_free(ret);
|
|
return NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len_in)
|
|
{
|
|
unsigned char *c;
|
|
const char *data = _data;
|
|
size_t len;
|
|
|
|
if (len_in < 0) {
|
|
if (data == NULL)
|
|
return 0;
|
|
len = strlen(data);
|
|
} else {
|
|
len = (size_t)len_in;
|
|
}
|
|
/*
|
|
* Verify that the length fits within an integer for assignment to
|
|
* str->length below. The additional 1 is subtracted to allow for the
|
|
* '\0' terminator even though this isn't strictly necessary.
|
|
*/
|
|
if (len > INT_MAX - 1) {
|
|
ASN1err(0, ASN1_R_TOO_LARGE);
|
|
return 0;
|
|
}
|
|
if ((size_t)str->length <= len || str->data == NULL) {
|
|
c = str->data;
|
|
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
/* No NUL terminator in fuzzing builds */
|
|
str->data = OPENSSL_realloc(c, len != 0 ? len : 1);
|
|
#else
|
|
str->data = OPENSSL_realloc(c, len + 1);
|
|
#endif
|
|
if (str->data == NULL) {
|
|
ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
|
|
str->data = c;
|
|
return 0;
|
|
}
|
|
}
|
|
str->length = len;
|
|
if (data != NULL) {
|
|
memcpy(str->data, data, len);
|
|
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
/* Set the unused byte to something non NUL and printable. */
|
|
if (len == 0)
|
|
str->data[len] = '~';
|
|
#else
|
|
/*
|
|
* Add a NUL terminator. This should not be necessary - but we add it as
|
|
* a safety precaution
|
|
*/
|
|
str->data[len] = '\0';
|
|
#endif
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
|
|
{
|
|
OPENSSL_free(str->data);
|
|
str->data = data;
|
|
str->length = len;
|
|
}
|
|
|
|
ASN1_STRING *ASN1_STRING_new(void)
|
|
{
|
|
return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
|
|
}
|
|
|
|
ASN1_STRING *ASN1_STRING_type_new(int type)
|
|
{
|
|
ASN1_STRING *ret;
|
|
|
|
ret = OPENSSL_zalloc(sizeof(*ret));
|
|
if (ret == NULL) {
|
|
ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
|
|
return NULL;
|
|
}
|
|
ret->type = type;
|
|
return ret;
|
|
}
|
|
|
|
void asn1_string_embed_free(ASN1_STRING *a, int embed)
|
|
{
|
|
if (a == NULL)
|
|
return;
|
|
if (!(a->flags & ASN1_STRING_FLAG_NDEF))
|
|
OPENSSL_free(a->data);
|
|
if (embed == 0)
|
|
OPENSSL_free(a);
|
|
}
|
|
|
|
void ASN1_STRING_free(ASN1_STRING *a)
|
|
{
|
|
if (a == NULL)
|
|
return;
|
|
asn1_string_embed_free(a, a->flags & ASN1_STRING_FLAG_EMBED);
|
|
}
|
|
|
|
void ASN1_STRING_clear_free(ASN1_STRING *a)
|
|
{
|
|
if (a == NULL)
|
|
return;
|
|
if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
|
|
OPENSSL_cleanse(a->data, a->length);
|
|
ASN1_STRING_free(a);
|
|
}
|
|
|
|
int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
|
|
{
|
|
int i;
|
|
|
|
i = (a->length - b->length);
|
|
if (i == 0) {
|
|
if (a->length != 0)
|
|
i = memcmp(a->data, b->data, a->length);
|
|
if (i == 0)
|
|
return a->type - b->type;
|
|
else
|
|
return i;
|
|
} else
|
|
return i;
|
|
}
|
|
|
|
int ASN1_STRING_length(const ASN1_STRING *x)
|
|
{
|
|
return x->length;
|
|
}
|
|
|
|
void ASN1_STRING_length_set(ASN1_STRING *x, int len)
|
|
{
|
|
x->length = len;
|
|
}
|
|
|
|
int ASN1_STRING_type(const ASN1_STRING *x)
|
|
{
|
|
return x->type;
|
|
}
|
|
|
|
const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
|
|
{
|
|
return x->data;
|
|
}
|
|
|
|
# if OPENSSL_API_COMPAT < 0x10100000L
|
|
unsigned char *ASN1_STRING_data(ASN1_STRING *x)
|
|
{
|
|
return x->data;
|
|
}
|
|
#endif
|