mirror of
https://github.com/ossrs/srs.git
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391 lines
8.7 KiB
C
391 lines
8.7 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1.h>
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#include "asn1_locl.h"
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static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
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long max);
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static void asn1_put_length(unsigned char **pp, int length);
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static int _asn1_check_infinite_end(const unsigned char **p, long len)
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{
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/*
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* If there is 0 or 1 byte left, the length check should pick things up
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*/
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if (len <= 0)
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return 1;
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else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
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(*p) += 2;
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return 1;
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}
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return 0;
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}
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int ASN1_check_infinite_end(unsigned char **p, long len)
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{
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return _asn1_check_infinite_end((const unsigned char **)p, len);
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}
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int ASN1_const_check_infinite_end(const unsigned char **p, long len)
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{
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return _asn1_check_infinite_end(p, len);
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}
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int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
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int *pclass, long omax)
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{
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int i, ret;
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long l;
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const unsigned char *p = *pp;
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int tag, xclass, inf;
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long max = omax;
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if (!max)
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goto err;
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ret = (*p & V_ASN1_CONSTRUCTED);
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xclass = (*p & V_ASN1_PRIVATE);
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i = *p & V_ASN1_PRIMITIVE_TAG;
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if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
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p++;
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if (--max == 0)
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goto err;
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l = 0;
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while (*p & 0x80) {
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l <<= 7L;
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l |= *(p++) & 0x7f;
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if (--max == 0)
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goto err;
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if (l > (INT_MAX >> 7L))
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goto err;
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}
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l <<= 7L;
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l |= *(p++) & 0x7f;
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tag = (int)l;
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if (--max == 0)
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goto err;
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} else {
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tag = i;
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p++;
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if (--max == 0)
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goto err;
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}
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*ptag = tag;
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*pclass = xclass;
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if (!asn1_get_length(&p, &inf, plength, max))
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goto err;
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if (inf && !(ret & V_ASN1_CONSTRUCTED))
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goto err;
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if (*plength > (omax - (p - *pp))) {
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ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
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/*
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* Set this so that even if things are not long enough the values are
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* set correctly
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*/
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ret |= 0x80;
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}
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*pp = p;
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return ret | inf;
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err:
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ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
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return 0x80;
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}
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/*
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* Decode a length field.
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* The short form is a single byte defining a length 0 - 127.
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* The long form is a byte 0 - 127 with the top bit set and this indicates
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* the number of following octets that contain the length. These octets
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* are stored most significant digit first.
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*/
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static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
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long max)
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{
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const unsigned char *p = *pp;
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unsigned long ret = 0;
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int i;
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if (max-- < 1)
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return 0;
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if (*p == 0x80) {
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*inf = 1;
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p++;
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} else {
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*inf = 0;
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i = *p & 0x7f;
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if (*p++ & 0x80) {
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if (max < i + 1)
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return 0;
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/* Skip leading zeroes */
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while (i > 0 && *p == 0) {
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p++;
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i--;
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}
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if (i > (int)sizeof(long))
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return 0;
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while (i > 0) {
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ret <<= 8;
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ret |= *p++;
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i--;
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}
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if (ret > LONG_MAX)
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return 0;
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} else
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ret = i;
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}
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*pp = p;
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*rl = (long)ret;
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return 1;
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}
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/*
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* class 0 is constructed constructed == 2 for indefinite length constructed
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*/
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void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
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int xclass)
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{
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unsigned char *p = *pp;
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int i, ttag;
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i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
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i |= (xclass & V_ASN1_PRIVATE);
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if (tag < 31)
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*(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
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else {
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*(p++) = i | V_ASN1_PRIMITIVE_TAG;
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for (i = 0, ttag = tag; ttag > 0; i++)
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ttag >>= 7;
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ttag = i;
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while (i-- > 0) {
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p[i] = tag & 0x7f;
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if (i != (ttag - 1))
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p[i] |= 0x80;
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tag >>= 7;
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}
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p += ttag;
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}
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if (constructed == 2)
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*(p++) = 0x80;
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else
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asn1_put_length(&p, length);
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*pp = p;
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}
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int ASN1_put_eoc(unsigned char **pp)
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{
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unsigned char *p = *pp;
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*p++ = 0;
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*p++ = 0;
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*pp = p;
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return 2;
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}
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static void asn1_put_length(unsigned char **pp, int length)
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{
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unsigned char *p = *pp;
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int i, l;
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if (length <= 127)
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*(p++) = (unsigned char)length;
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else {
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l = length;
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for (i = 0; l > 0; i++)
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l >>= 8;
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*(p++) = i | 0x80;
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l = i;
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while (i-- > 0) {
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p[i] = length & 0xff;
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length >>= 8;
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}
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p += l;
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}
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*pp = p;
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}
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int ASN1_object_size(int constructed, int length, int tag)
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{
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int ret = 1;
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if (length < 0)
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return -1;
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if (tag >= 31) {
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while (tag > 0) {
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tag >>= 7;
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ret++;
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}
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}
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if (constructed == 2) {
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ret += 3;
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} else {
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ret++;
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if (length > 127) {
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int tmplen = length;
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while (tmplen > 0) {
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tmplen >>= 8;
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ret++;
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}
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}
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}
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if (ret >= INT_MAX - length)
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return -1;
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return ret + length;
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}
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int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
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{
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if (str == NULL)
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return 0;
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dst->type = str->type;
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if (!ASN1_STRING_set(dst, str->data, str->length))
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return 0;
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/* Copy flags but preserve embed value */
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dst->flags &= ASN1_STRING_FLAG_EMBED;
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dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
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return 1;
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}
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ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
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{
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ASN1_STRING *ret;
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if (!str)
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return NULL;
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ret = ASN1_STRING_new();
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if (ret == NULL)
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return NULL;
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if (!ASN1_STRING_copy(ret, str)) {
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ASN1_STRING_free(ret);
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return NULL;
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}
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return ret;
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}
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int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
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{
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unsigned char *c;
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const char *data = _data;
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if (len < 0) {
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if (data == NULL)
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return 0;
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else
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len = strlen(data);
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}
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if ((str->length <= len) || (str->data == NULL)) {
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c = str->data;
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str->data = OPENSSL_realloc(c, len + 1);
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if (str->data == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
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str->data = c;
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return 0;
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}
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}
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str->length = len;
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if (data != NULL) {
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memcpy(str->data, data, len);
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/* an allowance for strings :-) */
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str->data[len] = '\0';
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}
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return 1;
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}
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void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
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{
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OPENSSL_free(str->data);
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str->data = data;
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str->length = len;
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}
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ASN1_STRING *ASN1_STRING_new(void)
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{
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return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
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}
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ASN1_STRING *ASN1_STRING_type_new(int type)
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{
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ASN1_STRING *ret;
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ret = OPENSSL_zalloc(sizeof(*ret));
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if (ret == NULL) {
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ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->type = type;
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return ret;
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}
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void asn1_string_embed_free(ASN1_STRING *a, int embed)
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{
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if (a == NULL)
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return;
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if (!(a->flags & ASN1_STRING_FLAG_NDEF))
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OPENSSL_free(a->data);
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if (embed == 0)
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OPENSSL_free(a);
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}
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void ASN1_STRING_free(ASN1_STRING *a)
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{
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if (a == NULL)
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return;
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asn1_string_embed_free(a, a->flags & ASN1_STRING_FLAG_EMBED);
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}
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void ASN1_STRING_clear_free(ASN1_STRING *a)
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{
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if (a == NULL)
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return;
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if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
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OPENSSL_cleanse(a->data, a->length);
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ASN1_STRING_free(a);
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}
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int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
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{
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int i;
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i = (a->length - b->length);
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if (i == 0) {
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i = memcmp(a->data, b->data, a->length);
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if (i == 0)
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return a->type - b->type;
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else
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return i;
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} else
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return i;
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}
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int ASN1_STRING_length(const ASN1_STRING *x)
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{
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return x->length;
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}
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void ASN1_STRING_length_set(ASN1_STRING *x, int len)
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{
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x->length = len;
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}
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int ASN1_STRING_type(const ASN1_STRING *x)
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{
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return x->type;
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}
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const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
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{
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return x->data;
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}
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# if OPENSSL_API_COMPAT < 0x10100000L
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unsigned char *ASN1_STRING_data(ASN1_STRING *x)
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{
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return x->data;
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}
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#endif
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