[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <limits.h>
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| 12 | #include "internal/cryptlib.h"
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| 13 | #include "internal/numbers.h"
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| 14 | #include <openssl/buffer.h>
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| 15 | #include <openssl/asn1.h>
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| 16 |
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| 17 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
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| 18 |
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| 19 | #ifndef NO_OLD_ASN1
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| 20 | # ifndef OPENSSL_NO_STDIO
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| 21 |
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| 22 | void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x)
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| 23 | {
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| 24 | BIO *b;
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| 25 | void *ret;
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| 26 |
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| 27 | if ((b = BIO_new(BIO_s_file())) == NULL) {
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| 28 | ASN1err(ASN1_F_ASN1_D2I_FP, ERR_R_BUF_LIB);
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| 29 | return (NULL);
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| 30 | }
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| 31 | BIO_set_fp(b, in, BIO_NOCLOSE);
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| 32 | ret = ASN1_d2i_bio(xnew, d2i, b, x);
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| 33 | BIO_free(b);
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| 34 | return (ret);
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| 35 | }
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| 36 | # endif
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| 37 |
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| 38 | void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x)
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| 39 | {
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| 40 | BUF_MEM *b = NULL;
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| 41 | const unsigned char *p;
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| 42 | void *ret = NULL;
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| 43 | int len;
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| 44 |
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| 45 | len = asn1_d2i_read_bio(in, &b);
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| 46 | if (len < 0)
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| 47 | goto err;
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| 48 |
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| 49 | p = (unsigned char *)b->data;
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| 50 | ret = d2i(x, &p, len);
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| 51 | err:
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| 52 | BUF_MEM_free(b);
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| 53 | return (ret);
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| 54 | }
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| 55 |
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| 56 | #endif
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| 57 |
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| 58 | void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
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| 59 | {
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| 60 | BUF_MEM *b = NULL;
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| 61 | const unsigned char *p;
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| 62 | void *ret = NULL;
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| 63 | int len;
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| 64 |
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| 65 | len = asn1_d2i_read_bio(in, &b);
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| 66 | if (len < 0)
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| 67 | goto err;
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| 68 |
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| 69 | p = (const unsigned char *)b->data;
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| 70 | ret = ASN1_item_d2i(x, &p, len, it);
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| 71 | err:
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| 72 | BUF_MEM_free(b);
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| 73 | return (ret);
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| 74 | }
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| 75 |
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| 76 | #ifndef OPENSSL_NO_STDIO
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| 77 | void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
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| 78 | {
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| 79 | BIO *b;
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| 80 | char *ret;
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| 81 |
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| 82 | if ((b = BIO_new(BIO_s_file())) == NULL) {
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| 83 | ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB);
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| 84 | return (NULL);
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| 85 | }
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| 86 | BIO_set_fp(b, in, BIO_NOCLOSE);
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| 87 | ret = ASN1_item_d2i_bio(it, b, x);
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| 88 | BIO_free(b);
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| 89 | return (ret);
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| 90 | }
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| 91 | #endif
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| 92 |
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| 93 | #define HEADER_SIZE 8
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| 94 | #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
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| 95 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
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| 96 | {
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| 97 | BUF_MEM *b;
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| 98 | unsigned char *p;
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| 99 | int i;
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| 100 | size_t want = HEADER_SIZE;
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| 101 | uint32_t eos = 0;
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| 102 | size_t off = 0;
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| 103 | size_t len = 0;
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| 104 |
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| 105 | const unsigned char *q;
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| 106 | long slen;
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| 107 | int inf, tag, xclass;
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| 108 |
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| 109 | b = BUF_MEM_new();
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| 110 | if (b == NULL) {
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| 111 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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| 112 | return -1;
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| 113 | }
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| 114 |
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| 115 | ERR_clear_error();
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| 116 | for (;;) {
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| 117 | if (want >= (len - off)) {
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| 118 | want -= (len - off);
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| 119 |
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| 120 | if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) {
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| 121 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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| 122 | goto err;
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| 123 | }
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| 124 | i = BIO_read(in, &(b->data[len]), want);
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| 125 | if ((i < 0) && ((len - off) == 0)) {
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| 126 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA);
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| 127 | goto err;
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| 128 | }
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| 129 | if (i > 0) {
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| 130 | if (len + i < len) {
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| 131 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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| 132 | goto err;
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| 133 | }
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| 134 | len += i;
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| 135 | }
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| 136 | }
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| 137 | /* else data already loaded */
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| 138 |
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| 139 | p = (unsigned char *)&(b->data[off]);
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| 140 | q = p;
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| 141 | inf = ASN1_get_object(&q, &slen, &tag, &xclass, len - off);
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| 142 | if (inf & 0x80) {
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| 143 | unsigned long e;
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| 144 |
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| 145 | e = ERR_GET_REASON(ERR_peek_error());
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| 146 | if (e != ASN1_R_TOO_LONG)
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| 147 | goto err;
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| 148 | else
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| 149 | ERR_clear_error(); /* clear error */
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| 150 | }
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| 151 | i = q - p; /* header length */
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| 152 | off += i; /* end of data */
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| 153 |
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| 154 | if (inf & 1) {
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| 155 | /* no data body so go round again */
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| 156 | if (eos == UINT32_MAX) {
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| 157 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_HEADER_TOO_LONG);
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| 158 | goto err;
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| 159 | }
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| 160 | eos++;
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| 161 | want = HEADER_SIZE;
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| 162 | } else if (eos && (slen == 0) && (tag == V_ASN1_EOC)) {
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| 163 | /* eos value, so go back and read another header */
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| 164 | eos--;
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| 165 | if (eos == 0)
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| 166 | break;
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| 167 | else
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| 168 | want = HEADER_SIZE;
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| 169 | } else {
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| 170 | /* suck in slen bytes of data */
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| 171 | want = slen;
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| 172 | if (want > (len - off)) {
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| 173 | size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
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| 174 |
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| 175 | want -= (len - off);
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| 176 | if (want > INT_MAX /* BIO_read takes an int length */ ||
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| 177 | len + want < len) {
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| 178 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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| 179 | goto err;
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| 180 | }
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| 181 | while (want > 0) {
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| 182 | /*
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| 183 | * Read content in chunks of increasing size
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| 184 | * so we can return an error for EOF without
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| 185 | * having to allocate the entire content length
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| 186 | * in one go.
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| 187 | */
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| 188 | size_t chunk = want > chunk_max ? chunk_max : want;
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| 189 |
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| 190 | if (!BUF_MEM_grow_clean(b, len + chunk)) {
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| 191 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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| 192 | goto err;
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| 193 | }
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| 194 | want -= chunk;
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| 195 | while (chunk > 0) {
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| 196 | i = BIO_read(in, &(b->data[len]), chunk);
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| 197 | if (i <= 0) {
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| 198 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
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| 199 | ASN1_R_NOT_ENOUGH_DATA);
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| 200 | goto err;
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| 201 | }
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| 202 | /*
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| 203 | * This can't overflow because |len+want| didn't
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| 204 | * overflow.
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| 205 | */
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| 206 | len += i;
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| 207 | chunk -= i;
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| 208 | }
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| 209 | if (chunk_max < INT_MAX/2)
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| 210 | chunk_max *= 2;
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| 211 | }
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| 212 | }
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| 213 | if (off + slen < off) {
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| 214 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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| 215 | goto err;
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| 216 | }
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| 217 | off += slen;
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| 218 | if (eos == 0) {
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| 219 | break;
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| 220 | } else
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| 221 | want = HEADER_SIZE;
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| 222 | }
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| 223 | }
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| 224 |
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| 225 | if (off > INT_MAX) {
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| 226 | ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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| 227 | goto err;
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| 228 | }
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| 229 |
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| 230 | *pb = b;
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| 231 | return off;
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| 232 | err:
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| 233 | BUF_MEM_free(b);
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| 234 | return -1;
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| 235 | }
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