| /* 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 <openssl/buf.h> |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| |
| static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); |
| |
| #ifndef NO_OLD_ASN1 |
| # ifndef OPENSSL_NO_FP_API |
| |
| void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x) |
| { |
| BIO *b = BIO_new_fp(in, BIO_NOCLOSE); |
| if (b == NULL) { |
| OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB); |
| return NULL; |
| } |
| void *ret = ASN1_d2i_bio(xnew, d2i, b, x); |
| BIO_free(b); |
| return (ret); |
| } |
| # endif |
| |
| void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x) |
| { |
| BUF_MEM *b = NULL; |
| const unsigned char *p; |
| void *ret = NULL; |
| int len; |
| |
| len = asn1_d2i_read_bio(in, &b); |
| if (len < 0) |
| goto err; |
| |
| p = (unsigned char *)b->data; |
| ret = d2i(x, &p, len); |
| err: |
| if (b != NULL) |
| BUF_MEM_free(b); |
| return (ret); |
| } |
| |
| #endif |
| |
| void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) |
| { |
| BUF_MEM *b = NULL; |
| const unsigned char *p; |
| void *ret = NULL; |
| int len; |
| |
| len = asn1_d2i_read_bio(in, &b); |
| if (len < 0) |
| goto err; |
| |
| p = (const unsigned char *)b->data; |
| ret = ASN1_item_d2i(x, &p, len, it); |
| err: |
| if (b != NULL) |
| BUF_MEM_free(b); |
| return (ret); |
| } |
| |
| #ifndef OPENSSL_NO_FP_API |
| void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) |
| { |
| BIO *b = BIO_new_fp(in, BIO_NOCLOSE); |
| if (b == NULL) { |
| OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB); |
| return NULL; |
| } |
| void *ret = ASN1_item_d2i_bio(it, b, x); |
| BIO_free(b); |
| return ret; |
| } |
| #endif |
| |
| typedef struct asn1_const_ctx_st |
| { |
| const unsigned char *p;/* work char pointer */ |
| int eos; /* end of sequence read for indefinite encoding */ |
| int error; /* error code to use when returning an error */ |
| int inf; /* constructed if 0x20, indefinite is 0x21 */ |
| int tag; /* tag from last 'get object' */ |
| int xclass; /* class from last 'get object' */ |
| long slen; /* length of last 'get object' */ |
| const unsigned char *max; /* largest value of p allowed */ |
| const unsigned char *q;/* temporary variable */ |
| const unsigned char **pp;/* variable */ |
| int line; /* used in error processing */ |
| } ASN1_const_CTX; |
| |
| #define HEADER_SIZE 8 |
| #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024) |
| static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) |
| { |
| BUF_MEM *b; |
| unsigned char *p; |
| int i; |
| ASN1_const_CTX c; |
| size_t want = HEADER_SIZE; |
| int eos = 0; |
| size_t off = 0; |
| size_t len = 0; |
| |
| b = BUF_MEM_new(); |
| if (b == NULL) { |
| OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| return -1; |
| } |
| |
| ERR_clear_error(); |
| for (;;) { |
| if (want >= (len - off)) { |
| want -= (len - off); |
| |
| if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { |
| OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| i = BIO_read(in, &(b->data[len]), want); |
| if ((i < 0) && ((len - off) == 0)) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); |
| goto err; |
| } |
| if (i > 0) { |
| if (len + i < len) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| goto err; |
| } |
| len += i; |
| } |
| } |
| /* else data already loaded */ |
| |
| p = (unsigned char *)&(b->data[off]); |
| c.p = p; |
| c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass), |
| len - off); |
| if (c.inf & 0x80) { |
| uint32_t error = ERR_peek_error(); |
| if (ERR_GET_LIB(error) != ERR_LIB_ASN1 || |
| ERR_GET_REASON(error) != ASN1_R_TOO_LONG) { |
| goto err; |
| } |
| ERR_clear_error(); |
| } |
| i = c.p - p; /* header length */ |
| off += i; /* end of data */ |
| |
| if (c.inf & 1) { |
| /* no data body so go round again */ |
| eos++; |
| if (eos < 0) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG); |
| goto err; |
| } |
| want = HEADER_SIZE; |
| } else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) { |
| /* eos value, so go back and read another header */ |
| eos--; |
| if (eos <= 0) |
| break; |
| else |
| want = HEADER_SIZE; |
| } else { |
| /* suck in c.slen bytes of data */ |
| want = c.slen; |
| if (want > (len - off)) { |
| size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE; |
| want -= (len - off); |
| if (want > INT_MAX /* BIO_read takes an int length */ || |
| len + want < len) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| goto err; |
| } |
| while (want > 0) { |
| /* |
| * Read content in chunks of increasing size |
| * so we can return an error for EOF without |
| * having to allocate the entire content length |
| * in one go. |
| */ |
| size_t chunk = want > chunk_max ? chunk_max : want; |
| |
| if (!BUF_MEM_grow_clean(b, len + chunk)) { |
| OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| goto err; |
| } |
| want -= chunk; |
| while (chunk > 0) { |
| i = BIO_read(in, &(b->data[len]), chunk); |
| if (i <= 0) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); |
| goto err; |
| } |
| /* |
| * This can't overflow because |len+want| didn't |
| * overflow. |
| */ |
| len += i; |
| chunk -= i; |
| } |
| if (chunk_max < INT_MAX/2) |
| chunk_max *= 2; |
| } |
| } |
| if (off + c.slen < off) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| goto err; |
| } |
| off += c.slen; |
| if (eos <= 0) { |
| break; |
| } else |
| want = HEADER_SIZE; |
| } |
| } |
| |
| if (off > INT_MAX) { |
| OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| goto err; |
| } |
| |
| *pb = b; |
| return off; |
| err: |
| if (b != NULL) |
| BUF_MEM_free(b); |
| return -1; |
| } |
