743 lines
16 KiB
C
743 lines
16 KiB
C
/*
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* Copyright (c) 2009 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Portions Copyright (c) 2009 - 2010 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "der_locl.h"
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#include <com_err.h>
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enum trigger_method { FOFF, FRANDOM, FLINEAR, FLINEAR_SIZE };
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#ifdef ASN1_FUZZER
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static enum trigger_method method = FOFF;
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/* FLINEAR */
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static unsigned long fnum, fcur, fsize;
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#endif
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int
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asn1_fuzzer_method(const char *mode)
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{
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#ifdef ASN1_FUZZER
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if (mode == NULL || strcasecmp(mode, "off") == 0) {
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method = FOFF;
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} else if (strcasecmp(mode, "random") == 0) {
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method = FRANDOM;
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} else if (strcasecmp(mode, "linear") == 0) {
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method = FLINEAR;
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} else if (strcasecmp(mode, "linear-size") == 0) {
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method = FLINEAR_SIZE;
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} else
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return 1;
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return 0;
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#else
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return 1;
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#endif
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}
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void
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asn1_fuzzer_reset(void)
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{
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#ifdef ASN1_FUZZER
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fcur = 0;
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fsize = 0;
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fnum = 0;
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#endif
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}
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void
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asn1_fuzzer_next(void)
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{
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#ifdef ASN1_FUZZER
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fcur = 0;
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fsize = 0;
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fnum++;
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#endif
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}
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int
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asn1_fuzzer_done(void)
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{
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#ifndef ASN1_FUZZER
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abort();
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#else
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/* since code paths */
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return (fnum > 10000);
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#endif
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}
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#ifdef ASN1_FUZZER
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static int
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fuzzer_trigger(unsigned int chance)
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{
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switch(method) {
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case FOFF:
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return 0;
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case FRANDOM:
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if ((rk_random() % chance) != 1)
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return 0;
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return 1;
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case FLINEAR:
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if (fnum == fcur++)
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return 1;
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return 0;
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case FLINEAR_SIZE:
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return 0;
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}
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return 0;
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}
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static int
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fuzzer_size_trigger(unsigned long *cur)
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{
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if (method != FLINEAR_SIZE)
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return 0;
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if (fnum == (*cur)++)
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return 1;
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return 0;
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}
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static size_t
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fuzzer_length_len (size_t len)
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{
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if (fuzzer_size_trigger(&fsize)) {
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len = 0;
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} else if (fuzzer_size_trigger(&fsize)) {
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len = 129;
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} else if (fuzzer_size_trigger(&fsize)) {
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len = 0xffff;
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}
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if (len < 128)
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return 1;
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else {
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int ret = 0;
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do {
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++ret;
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len /= 256;
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} while (len);
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return ret + 1;
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}
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}
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static int
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fuzzer_put_length (unsigned char *p, size_t len, size_t val, size_t *size)
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{
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if (len < 1)
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return ASN1_OVERFLOW;
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if (fuzzer_size_trigger(&fcur)) {
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val = 0;
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} else if (fuzzer_size_trigger(&fcur)) {
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val = 129;
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} else if (fuzzer_size_trigger(&fcur)) {
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val = 0xffff;
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}
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if (val < 128) {
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*p = val;
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*size = 1;
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} else {
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size_t l = 0;
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while(val > 0) {
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if(len < 2)
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return ASN1_OVERFLOW;
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*p-- = val % 256;
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val /= 256;
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len--;
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l++;
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}
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*p = 0x80 | l;
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if(size)
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*size = l + 1;
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}
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return 0;
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}
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static int
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fuzzer_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
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unsigned int tag, size_t *size)
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{
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unsigned fcont = 0;
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if (tag <= 30) {
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if (len < 1)
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return ASN1_OVERFLOW;
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if (fuzzer_trigger(100))
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*p = MAKE_TAG(class, type, 0x1f);
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else
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*p = MAKE_TAG(class, type, tag);
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*size = 1;
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} else {
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size_t ret = 0;
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unsigned int continuation = 0;
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do {
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if (len < 1)
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return ASN1_OVERFLOW;
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*p-- = tag % 128 | continuation;
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len--;
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ret++;
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tag /= 128;
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continuation = 0x80;
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} while(tag > 0);
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if (len < 1)
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return ASN1_OVERFLOW;
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if (fuzzer_trigger(100))
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*p-- = MAKE_TAG(class, type, 0);
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else
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*p-- = MAKE_TAG(class, type, 0x1f);
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ret++;
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*size = ret;
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}
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return 0;
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}
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static int
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fuzzer_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
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Der_class class, Der_type type,
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unsigned int tag, size_t *size)
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{
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size_t ret = 0;
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size_t l;
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int e;
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e = fuzzer_put_length (p, len, len_val, &l);
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if(e)
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return e;
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p -= l;
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len -= l;
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ret += l;
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e = fuzzer_put_tag (p, len, class, type, tag, &l);
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if(e)
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return e;
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ret += l;
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*size = ret;
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return 0;
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}
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static int
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fuzzer_put_general_string (unsigned char *p, size_t len,
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const heim_general_string *str, size_t *size)
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{
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size_t slen = strlen(*str);
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if (len < slen)
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return ASN1_OVERFLOW;
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p -= slen;
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if (slen >= 2 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%s", 2);
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} else if (slen >= 2 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%n", 2);
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} else if (slen >= 4 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%10n", 4);
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} else if (slen >= 10 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%n%n%n%n%n", 10);
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} else if (slen >= 10 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%n%p%s%d%x", 10);
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} else if (slen >= 7 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%.1024d", 7);
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} else if (slen >= 7 && fuzzer_trigger(100)) {
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memcpy(p+1, *str, slen);
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memcpy(p+1, "%.2049d", 7);
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} else if (fuzzer_trigger(100)) {
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memset(p+1, 0, slen);
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} else if (fuzzer_trigger(100)) {
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memset(p+1, 0xff, slen);
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} else if (fuzzer_trigger(100)) {
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memset(p+1, 'A', slen);
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} else {
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memcpy(p+1, *str, slen);
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}
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*size = slen;
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return 0;
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}
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struct asn1_type_func fuzzerprim[A1T_NUM_ENTRY] = {
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#define fuzel(name, type) { \
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(asn1_type_encode)fuzzer_put_##name, \
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(asn1_type_decode)der_get_##name, \
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(asn1_type_length)der_length_##name, \
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(asn1_type_copy)der_copy_##name, \
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(asn1_type_release)der_free_##name, \
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sizeof(type) \
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}
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#define el(name, type) { \
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(asn1_type_encode)der_put_##name, \
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(asn1_type_decode)der_get_##name, \
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(asn1_type_length)der_length_##name, \
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(asn1_type_copy)der_copy_##name, \
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(asn1_type_release)der_free_##name, \
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sizeof(type) \
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}
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#define elber(name, type) { \
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(asn1_type_encode)der_put_##name, \
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(asn1_type_decode)der_get_##name##_ber, \
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(asn1_type_length)der_length_##name, \
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(asn1_type_copy)der_copy_##name, \
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(asn1_type_release)der_free_##name, \
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sizeof(type) \
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}
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el(integer, int),
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el(integer64, int64_t),
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el(heim_integer, heim_integer),
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el(integer, int),
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el(unsigned, unsigned),
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el(uninteger64, uint64_t),
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fuzel(general_string, heim_general_string),
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el(octet_string, heim_octet_string),
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elber(octet_string, heim_octet_string),
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el(ia5_string, heim_ia5_string),
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el(bmp_string, heim_bmp_string),
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el(universal_string, heim_universal_string),
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el(printable_string, heim_printable_string),
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el(visible_string, heim_visible_string),
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el(utf8string, heim_utf8_string),
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el(generalized_time, time_t),
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el(utctime, time_t),
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el(bit_string, heim_bit_string),
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{ (asn1_type_encode)der_put_boolean, (asn1_type_decode)der_get_boolean,
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(asn1_type_length)der_length_boolean, (asn1_type_copy)der_copy_integer,
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(asn1_type_release)der_free_integer, sizeof(int)
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},
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el(oid, heim_oid),
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el(general_string, heim_general_string),
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#undef fuzel
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#undef el
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#undef elber
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};
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int
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_asn1_encode_fuzzer(const struct asn1_template *t,
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unsigned char *p, size_t len,
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const void *data, size_t *size)
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{
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size_t elements = A1_HEADER_LEN(t);
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int ret = 0;
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size_t oldlen = len;
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t += A1_HEADER_LEN(t);
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while (elements) {
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switch (t->tt & A1_OP_MASK) {
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case A1_OP_TYPE:
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case A1_OP_TYPE_EXTERN: {
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size_t newsize;
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const void *el = DPOC(data, t->offset);
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if (t->tt & A1_FLAG_OPTIONAL) {
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void **pel = (void **)el;
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if (*pel == NULL)
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break;
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el = *pel;
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}
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if ((t->tt & A1_OP_MASK) == A1_OP_TYPE) {
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ret = _asn1_encode_fuzzer(t->ptr, p, len, el, &newsize);
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} else {
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const struct asn1_type_func *f = t->ptr;
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ret = (f->encode)(p, len, el, &newsize);
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}
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if (ret)
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return ret;
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p -= newsize; len -= newsize;
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break;
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}
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case A1_OP_TAG: {
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const void *olddata = data;
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size_t l, datalen;
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data = DPOC(data, t->offset);
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if (t->tt & A1_FLAG_OPTIONAL) {
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void **el = (void **)data;
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if (*el == NULL) {
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data = olddata;
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break;
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}
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data = *el;
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}
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ret = _asn1_encode_fuzzer(t->ptr, p, len, data, &datalen);
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if (ret)
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return ret;
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len -= datalen; p -= datalen;
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ret = fuzzer_put_length_and_tag(p, len, datalen,
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A1_TAG_CLASS(t->tt),
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A1_TAG_TYPE(t->tt),
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A1_TAG_TAG(t->tt), &l);
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if (ret)
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return ret;
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p -= l; len -= l;
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data = olddata;
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break;
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}
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case A1_OP_PARSE: {
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unsigned int type = A1_PARSE_TYPE(t->tt);
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size_t newsize;
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const void *el = DPOC(data, t->offset);
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if (type > sizeof(fuzzerprim)/sizeof(fuzzerprim[0])) {
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ABORT_ON_ERROR();
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return ASN1_PARSE_ERROR;
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}
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ret = (fuzzerprim[type].encode)(p, len, el, &newsize);
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if (ret)
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return ret;
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p -= newsize; len -= newsize;
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|
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break;
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}
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case A1_OP_SETOF: {
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const struct template_of *el = DPOC(data, t->offset);
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size_t ellen = _asn1_sizeofType(t->ptr);
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heim_octet_string *val;
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unsigned char *elptr = el->val;
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size_t i, totallen;
|
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if (el->len == 0)
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break;
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|
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if (el->len > UINT_MAX/sizeof(val[0]))
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return ERANGE;
|
|
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val = malloc(sizeof(val[0]) * el->len);
|
|
if (val == NULL)
|
|
return ENOMEM;
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|
|
|
for(totallen = 0, i = 0; i < el->len; i++) {
|
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unsigned char *next;
|
|
size_t l;
|
|
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val[i].length = _asn1_length(t->ptr, elptr);
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val[i].data = malloc(val[i].length);
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ret = _asn1_encode_fuzzer(t->ptr, DPO(val[i].data, val[i].length - 1),
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val[i].length, elptr, &l);
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if (ret)
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break;
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|
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|
next = elptr + ellen;
|
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if (next < elptr) {
|
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ret = ASN1_OVERFLOW;
|
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break;
|
|
}
|
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elptr = next;
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totallen += val[i].length;
|
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}
|
|
if (ret == 0 && totallen > len)
|
|
ret = ASN1_OVERFLOW;
|
|
if (ret) {
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|
do {
|
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free(val[i].data);
|
|
} while(i-- > 0);
|
|
free(val);
|
|
return ret;
|
|
}
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|
|
|
len -= totallen;
|
|
|
|
qsort(val, el->len, sizeof(val[0]), _heim_der_set_sort);
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|
|
|
i = el->len - 1;
|
|
do {
|
|
p -= val[i].length;
|
|
memcpy(p + 1, val[i].data, val[i].length);
|
|
free(val[i].data);
|
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} while(i-- > 0);
|
|
free(val);
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|
|
break;
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|
|
|
}
|
|
case A1_OP_SEQOF: {
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|
struct template_of *el = DPO(data, t->offset);
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size_t ellen = _asn1_sizeofType(t->ptr);
|
|
size_t newsize;
|
|
unsigned int i;
|
|
unsigned char *elptr = el->val;
|
|
|
|
if (el->len == 0)
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|
break;
|
|
|
|
elptr += ellen * (el->len - 1);
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|
|
|
for (i = 0; i < el->len; i++) {
|
|
ret = _asn1_encode_fuzzer(t->ptr, p, len,
|
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elptr,
|
|
&newsize);
|
|
if (ret)
|
|
return ret;
|
|
p -= newsize; len -= newsize;
|
|
elptr -= ellen;
|
|
}
|
|
|
|
break;
|
|
}
|
|
case A1_OP_BMEMBER: {
|
|
const struct asn1_template *bmember = t->ptr;
|
|
size_t size = bmember->offset;
|
|
size_t elements = A1_HEADER_LEN(bmember);
|
|
size_t pos;
|
|
unsigned char c = 0;
|
|
unsigned int bitset = 0;
|
|
int rfc1510 = (bmember->tt & A1_HBF_RFC1510);
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|
|
|
bmember += elements;
|
|
|
|
if (rfc1510)
|
|
pos = 31;
|
|
else
|
|
pos = bmember->offset;
|
|
|
|
while (elements && len) {
|
|
while (bmember->offset / 8 < pos / 8) {
|
|
if (rfc1510 || bitset || c) {
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = c; len--;
|
|
}
|
|
c = 0;
|
|
pos -= 8;
|
|
}
|
|
_asn1_bmember_put_bit(&c, data, bmember->offset, size, &bitset);
|
|
elements--; bmember--;
|
|
}
|
|
if (rfc1510 || bitset) {
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = c; len--;
|
|
}
|
|
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
if (rfc1510 || bitset == 0)
|
|
*p-- = 0;
|
|
else
|
|
*p-- = bitset - 1;
|
|
|
|
len--;
|
|
|
|
break;
|
|
}
|
|
case A1_OP_CHOICE: {
|
|
const struct asn1_template *choice = t->ptr;
|
|
const unsigned int *element = DPOC(data, choice->offset);
|
|
size_t datalen;
|
|
const void *el;
|
|
|
|
if (*element > A1_HEADER_LEN(choice)) {
|
|
printf("element: %d\n", *element);
|
|
return ASN1_PARSE_ERROR;
|
|
}
|
|
|
|
if (*element == 0) {
|
|
ret += der_put_octet_string(p, len,
|
|
DPOC(data, choice->tt), &datalen);
|
|
} else {
|
|
choice += *element;
|
|
el = DPOC(data, choice->offset);
|
|
ret = _asn1_encode_fuzzer(choice->ptr, p, len, el, &datalen);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
len -= datalen; p -= datalen;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
ABORT_ON_ERROR();
|
|
}
|
|
t--;
|
|
elements--;
|
|
}
|
|
|
|
if (fuzzer_trigger(1000)) {
|
|
memset(p + 1, 0, oldlen - len);
|
|
} else if (fuzzer_trigger(1000)) {
|
|
memset(p + 1, 0x41, oldlen - len);
|
|
} else if (fuzzer_trigger(1000)) {
|
|
memset(p + 1, 0xff, oldlen - len);
|
|
}
|
|
|
|
if (size)
|
|
*size = oldlen - len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
size_t
|
|
_asn1_length_fuzzer(const struct asn1_template *t, const void *data)
|
|
{
|
|
size_t elements = A1_HEADER_LEN(t);
|
|
size_t ret = 0;
|
|
|
|
t += A1_HEADER_LEN(t);
|
|
|
|
while (elements) {
|
|
switch (t->tt & A1_OP_MASK) {
|
|
case A1_OP_TYPE:
|
|
case A1_OP_TYPE_EXTERN: {
|
|
const void *el = DPOC(data, t->offset);
|
|
|
|
if (t->tt & A1_FLAG_OPTIONAL) {
|
|
void **pel = (void **)el;
|
|
if (*pel == NULL)
|
|
break;
|
|
el = *pel;
|
|
}
|
|
|
|
if ((t->tt & A1_OP_MASK) == A1_OP_TYPE) {
|
|
ret += _asn1_length(t->ptr, el);
|
|
} else {
|
|
const struct asn1_type_func *f = t->ptr;
|
|
ret += (f->length)(el);
|
|
}
|
|
break;
|
|
}
|
|
case A1_OP_TAG: {
|
|
size_t datalen;
|
|
const void *olddata = data;
|
|
|
|
data = DPO(data, t->offset);
|
|
|
|
if (t->tt & A1_FLAG_OPTIONAL) {
|
|
void **el = (void **)data;
|
|
if (*el == NULL) {
|
|
data = olddata;
|
|
break;
|
|
}
|
|
data = *el;
|
|
}
|
|
datalen = _asn1_length(t->ptr, data);
|
|
ret += der_length_tag(A1_TAG_TAG(t->tt)) + fuzzer_length_len(datalen);
|
|
ret += datalen;
|
|
data = olddata;
|
|
break;
|
|
}
|
|
case A1_OP_PARSE: {
|
|
unsigned int type = A1_PARSE_TYPE(t->tt);
|
|
const void *el = DPOC(data, t->offset);
|
|
|
|
if (type > sizeof(asn1_template_prim)/sizeof(asn1_template_prim[0])) {
|
|
ABORT_ON_ERROR();
|
|
break;
|
|
}
|
|
ret += (asn1_template_prim[type].length)(el);
|
|
break;
|
|
}
|
|
case A1_OP_SETOF:
|
|
case A1_OP_SEQOF: {
|
|
const struct template_of *el = DPOC(data, t->offset);
|
|
size_t ellen = _asn1_sizeofType(t->ptr);
|
|
const unsigned char *element = el->val;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < el->len; i++) {
|
|
ret += _asn1_length(t->ptr, element);
|
|
element += ellen;
|
|
}
|
|
|
|
break;
|
|
}
|
|
case A1_OP_BMEMBER: {
|
|
const struct asn1_template *bmember = t->ptr;
|
|
size_t size = bmember->offset;
|
|
size_t elements = A1_HEADER_LEN(bmember);
|
|
int rfc1510 = (bmember->tt & A1_HBF_RFC1510);
|
|
|
|
if (rfc1510) {
|
|
ret += 5;
|
|
} else {
|
|
|
|
ret += 1;
|
|
|
|
bmember += elements;
|
|
|
|
while (elements) {
|
|
if (_asn1_bmember_isset_bit(data, bmember->offset, size)) {
|
|
ret += (bmember->offset / 8) + 1;
|
|
break;
|
|
}
|
|
elements--; bmember--;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case A1_OP_CHOICE: {
|
|
const struct asn1_template *choice = t->ptr;
|
|
const unsigned int *element = DPOC(data, choice->offset);
|
|
|
|
if (*element > A1_HEADER_LEN(choice))
|
|
break;
|
|
|
|
if (*element == 0) {
|
|
ret += der_length_octet_string(DPOC(data, choice->tt));
|
|
} else {
|
|
choice += *element;
|
|
ret += _asn1_length(choice->ptr, DPOC(data, choice->offset));
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
ABORT_ON_ERROR();
|
|
break;
|
|
}
|
|
elements--;
|
|
t--;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#endif /* ASN1_FUZZER */
|