/* crypto/asn1/a_d2i_fp.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #include "cryptlib.h" #include #include static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); #ifndef NO_OLD_ASN1 # ifndef OPENSSL_NO_STDIO void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x) { BIO *b; void *ret; if ((b = BIO_new(BIO_s_file())) == NULL) { ASN1err(ASN1_F_ASN1_D2I_FP, ERR_R_BUF_LIB); return (NULL); } BIO_set_fp(b, in, BIO_NOCLOSE); 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_STDIO void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) { BIO *b; char *ret; if ((b = BIO_new(BIO_s_file())) == NULL) { ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB); return (NULL); } BIO_set_fp(b, in, BIO_NOCLOSE); ret = ASN1_item_d2i_bio(it, b, x); BIO_free(b); return (ret); } #endif #define HEADER_SIZE 8 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) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, 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)) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } i = BIO_read(in, &(b->data[len]), want); if ((i < 0) && ((len - off) == 0)) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA); goto err; } if (i > 0) { if (len + i < len) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, 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) { unsigned long e; e = ERR_GET_REASON(ERR_peek_error()); if (e != ASN1_R_TOO_LONG) goto err; else ERR_clear_error(); /* 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) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, 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)) { want -= (len - off); if (want > INT_MAX /* BIO_read takes an int length */ || len + want < len) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); goto err; } if (!BUF_MEM_grow_clean(b, len + want)) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); goto err; } while (want > 0) { i = BIO_read(in, &(b->data[len]), want); if (i <= 0) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA); goto err; } /* * This can't overflow because |len+want| didn't * overflow. */ len += i; want -= i; } } if (off + c.slen < off) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); goto err; } off += c.slen; if (eos <= 0) { break; } else want = HEADER_SIZE; } } if (off > INT_MAX) { ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); goto err; } *pb = b; return off; err: if (b != NULL) BUF_MEM_free(b); return -1; }