/* Copyright (C) 1995-1998 Eric Young ([email protected]) * All rights reserved. * * This package is an SSL implementation written * by Eric Young ([email protected]). * 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 ([email protected]). * * 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 ([email protected])" * 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 ([email protected])" * * 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 <openssl/asn1t.h> #include <openssl/bytestring.h> #include <openssl/err.h> #include <openssl/mem.h> #include <openssl/pool.h> #include <assert.h> #include <limits.h> #include <string.h> #include "../bytestring/internal.h" #include "../internal.h" #include "internal.h" // Constructed types with a recursive definition (such as can be found in PKCS7) // could eventually exceed the stack given malicious input with excessive // recursion. Therefore we limit the stack depth. This is the maximum number of // recursive invocations of asn1_item_embed_d2i(). #define ASN1_MAX_CONSTRUCTED_NEST … static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *cst, const unsigned char **in, long len, int exptag, int expclass, char opt); static int asn1_template_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, CRYPTO_BUFFER *buf, int depth); static int asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, CRYPTO_BUFFER *buf, int depth); static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, long len, int utype, const ASN1_ITEM *it); static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it, int tag, int aclass, char opt); static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it, int tag, int aclass, char opt, CRYPTO_BUFFER *buf, int depth); // Table to convert tags to bit values, used for MSTRING type static const unsigned long tag2bit[31] = …; unsigned long ASN1_tag2bit(int tag) { … } static int is_supported_universal_type(int tag, int aclass) { … } // Macro to initialize and invalidate the cache // Decode an ASN1 item, this currently behaves just like a standard 'd2i' // function. 'in' points to a buffer to read the data from, in future we // will have more advanced versions that can input data a piece at a time and // this will simply be a special case. ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it) { … } // Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and // tag mismatch return -1 to handle OPTIONAL // // TODO(davidben): Historically, all functions in this file had to account for // |*pval| containing an arbitrary existing value. This is no longer the case // because |ASN1_item_d2i| now always starts from NULL. As part of rewriting // this function, take the simplified assumptions into account. Though we must // still account for the internal calls to |ASN1_item_ex_new|. static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it, int tag, int aclass, char opt, CRYPTO_BUFFER *buf, int depth) { … } int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it, int tag, int aclass, char opt, CRYPTO_BUFFER *buf) { … } // Templates are handled with two separate functions. One handles any // EXPLICIT tag and the other handles the rest. static int asn1_template_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, CRYPTO_BUFFER *buf, int depth) { … } static int asn1_template_noexp_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, CRYPTO_BUFFER *buf, int depth) { … } static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, const unsigned char **in, long inlen, const ASN1_ITEM *it, int tag, int aclass, char opt) { … } // Translate ASN1 content octets into a structure static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, long len, int utype, const ASN1_ITEM *it) { … } // Check an ASN1 tag and length: a bit like ASN1_get_object but it // checks the expected tag. static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *cst, const unsigned char **in, long len, int exptag, int expclass, char opt) { … }
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