ref: 009439541d2c6e8af2596f8fb1b4df85861fd212
dir: /third_party/boringssl/src/crypto/asn1/asn1_lib.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <limits.h>
#include <string.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../internal.h"
#include "internal.h"
// Cross-module errors from crypto/x509/i2d_pr.c.
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE)
// Cross-module errors from crypto/x509/algorithm.c.
OPENSSL_DECLARE_ERROR_REASON(ASN1, CONTEXT_NOT_INITIALISED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, DIGEST_AND_KEY_TYPE_NOT_SUPPORTED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_MESSAGE_DIGEST_ALGORITHM)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_SIGNATURE_ALGORITHM)
OPENSSL_DECLARE_ERROR_REASON(ASN1, WRONG_PUBLIC_KEY_TYPE)
// Cross-module errors from crypto/x509/asn1_gen.c. TODO(davidben): Remove
// these once asn1_gen.c is gone.
OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR)
OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE)
// Limit |ASN1_STRING|s to 64 MiB of data. Most of this module, as well as
// downstream code, does not correctly handle overflow. We cap string fields
// more tightly than strictly necessary to fit in |int|. This is not expected to
// impact real world uses of this field.
//
// In particular, this limit is small enough that the bit count of a BIT STRING
// comfortably fits in an |int|, with room for arithmetic.
#define ASN1_STRING_MAX (64 * 1024 * 1024)
static void asn1_put_length(unsigned char **pp, int length);
int ASN1_get_object(const unsigned char **inp, long *out_len, int *out_tag,
int *out_class, long in_len) {
if (in_len < 0) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
return 0x80;
}
CBS_ASN1_TAG tag;
CBS cbs, body;
CBS_init(&cbs, *inp, (size_t)in_len);
if (!CBS_get_any_asn1(&cbs, &body, &tag) ||
// Bound the length to comfortably fit in an int. Lengths in this
// module often switch between int and long without overflow checks.
CBS_len(&body) > INT_MAX / 2) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
return 0x80;
}
// Convert between tag representations.
int tag_class = (tag & CBS_ASN1_CLASS_MASK) >> CBS_ASN1_TAG_SHIFT;
int constructed = (tag & CBS_ASN1_CONSTRUCTED) >> CBS_ASN1_TAG_SHIFT;
int tag_number = tag & CBS_ASN1_TAG_NUMBER_MASK;
// To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags.
if (tag_class == V_ASN1_UNIVERSAL && tag_number > V_ASN1_MAX_UNIVERSAL) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
return 0x80;
}
*inp = CBS_data(&body);
*out_len = CBS_len(&body);
*out_tag = tag_number;
*out_class = tag_class;
return constructed;
}
// 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) {
// This function is no longer used in the library, but some external code
// uses it.
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;
}
if (!ASN1_STRING_set(dst, str->data, str->length)) {
return 0;
}
dst->type = str->type;
dst->flags = str->flags;
return 1;
}
ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) {
ASN1_STRING *ret;
if (!str) {
return NULL;
}
ret = ASN1_STRING_new();
if (!ret) {
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, ossl_ssize_t len_s) {
const char *data = _data;
size_t len;
if (len_s < 0) {
if (data == NULL) {
return 0;
}
len = strlen(data);
} else {
len = (size_t)len_s;
}
static_assert(ASN1_STRING_MAX < INT_MAX, "len will not overflow int");
if (len > ASN1_STRING_MAX) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_OVERFLOW);
return 0;
}
if (str->length <= (int)len || str->data == NULL) {
unsigned char *c = str->data;
if (c == NULL) {
str->data = OPENSSL_malloc(len + 1);
} else {
str->data = OPENSSL_realloc(c, len + 1);
}
if (str->data == NULL) {
str->data = c;
return 0;
}
}
str->length = (int)len;
if (data != NULL) {
OPENSSL_memcpy(str->data, data, len);
// Historically, OpenSSL would NUL-terminate most (but not all)
// |ASN1_STRING|s, in case anyone accidentally passed |str->data| into a
// function expecting a C string. We retain this behavior for compatibility,
// but code must not rely on this. See CVE-2021-3712.
str->data[len] = '\0';
}
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 = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
if (ret == NULL) {
return NULL;
}
ret->length = 0;
ret->type = type;
ret->data = NULL;
ret->flags = 0;
return ret;
}
void ASN1_STRING_free(ASN1_STRING *str) {
if (str == NULL) {
return;
}
OPENSSL_free(str->data);
OPENSSL_free(str);
}
int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) {
// Capture padding bits and implicit truncation in BIT STRINGs.
int a_length = a->length, b_length = b->length;
uint8_t a_padding = 0, b_padding = 0;
if (a->type == V_ASN1_BIT_STRING) {
a_length = asn1_bit_string_length(a, &a_padding);
}
if (b->type == V_ASN1_BIT_STRING) {
b_length = asn1_bit_string_length(b, &b_padding);
}
if (a_length < b_length) {
return -1;
}
if (a_length > b_length) {
return 1;
}
// In a BIT STRING, the number of bits is 8 * length - padding. Invert this
// comparison so we compare by lengths.
if (a_padding > b_padding) {
return -1;
}
if (a_padding < b_padding) {
return 1;
}
int ret = OPENSSL_memcmp(a->data, b->data, a_length);
if (ret != 0) {
return ret;
}
// Comparing the type first is more natural, but this matches OpenSSL.
if (a->type < b->type) {
return -1;
}
if (a->type > b->type) {
return 1;
}
return 0;
}
int ASN1_STRING_length(const ASN1_STRING *str) { return str->length; }
int ASN1_STRING_type(const ASN1_STRING *str) { return str->type; }
unsigned char *ASN1_STRING_data(ASN1_STRING *str) { return str->data; }
const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *str) {
return str->data;
}