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609 lines
18 KiB
C
609 lines
18 KiB
C
/*
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* Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stddef.h>
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#include <string.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/objects.h>
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#include "internal/asn1_int.h"
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#include "asn1_locl.h"
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static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass);
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static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
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int skcontlen, const ASN1_ITEM *item,
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int do_sort, int iclass);
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static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
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const ASN1_TEMPLATE *tt, int tag, int aclass);
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static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
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const ASN1_ITEM *it, int flags);
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static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
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const ASN1_ITEM *it);
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/*
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* Top level i2d equivalents: the 'ndef' variant instructs the encoder to use
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* indefinite length constructed encoding, where appropriate
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*/
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int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out,
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const ASN1_ITEM *it)
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{
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return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
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}
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int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
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{
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return asn1_item_flags_i2d(val, out, it, 0);
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}
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/*
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* Encode an ASN1 item, this is use by the standard 'i2d' function. 'out'
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* points to a buffer to output the data to. The new i2d has one additional
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* feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is
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* allocated and populated with the encoding.
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*/
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static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
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const ASN1_ITEM *it, int flags)
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{
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if (out && !*out) {
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unsigned char *p, *buf;
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int len;
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len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
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if (len <= 0)
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return len;
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if ((buf = OPENSSL_malloc(len)) == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_FLAGS_I2D, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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p = buf;
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ASN1_item_ex_i2d(&val, &p, it, -1, flags);
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*out = buf;
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return len;
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}
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return ASN1_item_ex_i2d(&val, out, it, -1, flags);
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}
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/*
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* Encode an item, taking care of IMPLICIT tagging (if any). This function
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* performs the normal item handling: it can be used in external types.
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*/
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int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass)
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{
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const ASN1_TEMPLATE *tt = NULL;
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int i, seqcontlen, seqlen, ndef = 1;
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const ASN1_EXTERN_FUNCS *ef;
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const ASN1_AUX *aux = it->funcs;
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ASN1_aux_cb *asn1_cb = 0;
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if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
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return 0;
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if (aux && aux->asn1_cb)
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asn1_cb = aux->asn1_cb;
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switch (it->itype) {
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case ASN1_ITYPE_PRIMITIVE:
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if (it->templates)
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return asn1_template_ex_i2d(pval, out, it->templates,
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tag, aclass);
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return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
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case ASN1_ITYPE_MSTRING:
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return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
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case ASN1_ITYPE_CHOICE:
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if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
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return 0;
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i = asn1_get_choice_selector(pval, it);
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if ((i >= 0) && (i < it->tcount)) {
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ASN1_VALUE **pchval;
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const ASN1_TEMPLATE *chtt;
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chtt = it->templates + i;
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pchval = asn1_get_field_ptr(pval, chtt);
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return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
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}
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/* Fixme: error condition if selector out of range */
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if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
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return 0;
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break;
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case ASN1_ITYPE_EXTERN:
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/* If new style i2d it does all the work */
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ef = it->funcs;
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return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
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case ASN1_ITYPE_NDEF_SEQUENCE:
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/* Use indefinite length constructed if requested */
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if (aclass & ASN1_TFLG_NDEF)
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ndef = 2;
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/* fall through */
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case ASN1_ITYPE_SEQUENCE:
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i = asn1_enc_restore(&seqcontlen, out, pval, it);
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/* An error occurred */
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if (i < 0)
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return 0;
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/* We have a valid cached encoding... */
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if (i > 0)
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return seqcontlen;
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/* Otherwise carry on */
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seqcontlen = 0;
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/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
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if (tag == -1) {
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tag = V_ASN1_SEQUENCE;
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/* Retain any other flags in aclass */
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aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
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| V_ASN1_UNIVERSAL;
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}
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if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
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return 0;
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/* First work out sequence content length */
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for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
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const ASN1_TEMPLATE *seqtt;
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ASN1_VALUE **pseqval;
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int tmplen;
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seqtt = asn1_do_adb(pval, tt, 1);
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if (!seqtt)
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return 0;
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pseqval = asn1_get_field_ptr(pval, seqtt);
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tmplen = asn1_template_ex_i2d(pseqval, NULL, seqtt, -1, aclass);
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if (tmplen == -1 || (tmplen > INT_MAX - seqcontlen))
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return -1;
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seqcontlen += tmplen;
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}
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seqlen = ASN1_object_size(ndef, seqcontlen, tag);
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if (!out || seqlen == -1)
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return seqlen;
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/* Output SEQUENCE header */
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ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
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for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
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const ASN1_TEMPLATE *seqtt;
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ASN1_VALUE **pseqval;
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seqtt = asn1_do_adb(pval, tt, 1);
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if (!seqtt)
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return 0;
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pseqval = asn1_get_field_ptr(pval, seqtt);
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/* FIXME: check for errors in enhanced version */
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asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
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}
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if (ndef == 2)
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ASN1_put_eoc(out);
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if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
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return 0;
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return seqlen;
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default:
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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 asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
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const ASN1_TEMPLATE *tt, int tag, int iclass)
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{
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int i, ret, flags, ttag, tclass, ndef;
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ASN1_VALUE *tval;
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flags = tt->flags;
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/*
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* If field is embedded then val needs fixing so it is a pointer to
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* a pointer to a field.
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*/
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if (flags & ASN1_TFLG_EMBED) {
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tval = (ASN1_VALUE *)pval;
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pval = &tval;
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}
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/*
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* Work out tag and class to use: tagging may come either from the
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* template or the arguments, not both because this would create
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* ambiguity. Additionally the iclass argument may contain some
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* additional flags which should be noted and passed down to other
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* levels.
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*/
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if (flags & ASN1_TFLG_TAG_MASK) {
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/* Error if argument and template tagging */
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if (tag != -1)
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/* FIXME: error code here */
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return -1;
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/* Get tagging from template */
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ttag = tt->tag;
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tclass = flags & ASN1_TFLG_TAG_CLASS;
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} else if (tag != -1) {
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/* No template tagging, get from arguments */
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ttag = tag;
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tclass = iclass & ASN1_TFLG_TAG_CLASS;
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} else {
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ttag = -1;
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tclass = 0;
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}
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/*
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* Remove any class mask from iflag.
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*/
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iclass &= ~ASN1_TFLG_TAG_CLASS;
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/*
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* At this point 'ttag' contains the outer tag to use, 'tclass' is the
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* class and iclass is any flags passed to this function.
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*/
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/* if template and arguments require ndef, use it */
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if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
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ndef = 2;
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else
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ndef = 1;
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if (flags & ASN1_TFLG_SK_MASK) {
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/* SET OF, SEQUENCE OF */
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STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
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int isset, sktag, skaclass;
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int skcontlen, sklen;
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ASN1_VALUE *skitem;
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if (!*pval)
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return 0;
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if (flags & ASN1_TFLG_SET_OF) {
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isset = 1;
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/* 2 means we reorder */
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if (flags & ASN1_TFLG_SEQUENCE_OF)
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isset = 2;
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} else
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isset = 0;
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/*
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* Work out inner tag value: if EXPLICIT or no tagging use underlying
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* type.
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*/
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if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
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sktag = ttag;
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skaclass = tclass;
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} else {
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skaclass = V_ASN1_UNIVERSAL;
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if (isset)
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sktag = V_ASN1_SET;
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else
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sktag = V_ASN1_SEQUENCE;
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}
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/* Determine total length of items */
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skcontlen = 0;
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for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
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int tmplen;
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skitem = sk_ASN1_VALUE_value(sk, i);
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tmplen = ASN1_item_ex_i2d(&skitem, NULL, ASN1_ITEM_ptr(tt->item),
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-1, iclass);
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if (tmplen == -1 || (skcontlen > INT_MAX - tmplen))
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return -1;
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skcontlen += tmplen;
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}
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sklen = ASN1_object_size(ndef, skcontlen, sktag);
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if (sklen == -1)
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return -1;
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/* If EXPLICIT need length of surrounding tag */
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if (flags & ASN1_TFLG_EXPTAG)
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ret = ASN1_object_size(ndef, sklen, ttag);
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else
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ret = sklen;
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if (!out || ret == -1)
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return ret;
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/* Now encode this lot... */
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/* EXPLICIT tag */
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if (flags & ASN1_TFLG_EXPTAG)
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ASN1_put_object(out, ndef, sklen, ttag, tclass);
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/* SET or SEQUENCE and IMPLICIT tag */
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ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
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/* And the stuff itself */
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asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
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isset, iclass);
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if (ndef == 2) {
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ASN1_put_eoc(out);
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if (flags & ASN1_TFLG_EXPTAG)
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ASN1_put_eoc(out);
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}
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return ret;
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}
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if (flags & ASN1_TFLG_EXPTAG) {
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/* EXPLICIT tagging */
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/* Find length of tagged item */
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i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass);
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if (!i)
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return 0;
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/* Find length of EXPLICIT tag */
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ret = ASN1_object_size(ndef, i, ttag);
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if (out && ret != -1) {
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/* Output tag and item */
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ASN1_put_object(out, ndef, i, ttag, tclass);
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ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, iclass);
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if (ndef == 2)
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ASN1_put_eoc(out);
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}
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return ret;
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}
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/* Either normal or IMPLICIT tagging: combine class and flags */
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return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
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ttag, tclass | iclass);
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}
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/* Temporary structure used to hold DER encoding of items for SET OF */
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typedef struct {
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unsigned char *data;
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int length;
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ASN1_VALUE *field;
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} DER_ENC;
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static int der_cmp(const void *a, const void *b)
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{
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const DER_ENC *d1 = a, *d2 = b;
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int cmplen, i;
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cmplen = (d1->length < d2->length) ? d1->length : d2->length;
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i = memcmp(d1->data, d2->data, cmplen);
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if (i)
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return i;
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return d1->length - d2->length;
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}
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/* Output the content octets of SET OF or SEQUENCE OF */
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static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
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int skcontlen, const ASN1_ITEM *item,
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int do_sort, int iclass)
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{
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int i;
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ASN1_VALUE *skitem;
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unsigned char *tmpdat = NULL, *p = NULL;
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DER_ENC *derlst = NULL, *tder;
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if (do_sort) {
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/* Don't need to sort less than 2 items */
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if (sk_ASN1_VALUE_num(sk) < 2)
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do_sort = 0;
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else {
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derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
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* sizeof(*derlst));
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if (derlst == NULL)
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return 0;
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tmpdat = OPENSSL_malloc(skcontlen);
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if (tmpdat == NULL) {
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OPENSSL_free(derlst);
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return 0;
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}
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}
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}
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/* If not sorting just output each item */
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if (!do_sort) {
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for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
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skitem = sk_ASN1_VALUE_value(sk, i);
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ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
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}
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return 1;
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}
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p = tmpdat;
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/* Doing sort: build up a list of each member's DER encoding */
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for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
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skitem = sk_ASN1_VALUE_value(sk, i);
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tder->data = p;
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tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
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tder->field = skitem;
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}
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/* Now sort them */
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qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
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/* Output sorted DER encoding */
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p = *out;
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for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
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memcpy(p, tder->data, tder->length);
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p += tder->length;
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}
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*out = p;
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/* If do_sort is 2 then reorder the STACK */
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if (do_sort == 2) {
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for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
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(void)sk_ASN1_VALUE_set(sk, i, tder->field);
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}
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OPENSSL_free(derlst);
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OPENSSL_free(tmpdat);
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return 1;
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}
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static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass)
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{
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int len;
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int utype;
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int usetag;
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int ndef = 0;
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utype = it->utype;
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/*
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* Get length of content octets and maybe find out the underlying type.
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*/
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len = asn1_ex_i2c(pval, NULL, &utype, it);
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/*
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* If SEQUENCE, SET or OTHER then header is included in pseudo content
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* octets so don't include tag+length. We need to check here because the
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* call to asn1_ex_i2c() could change utype.
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*/
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if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
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(utype == V_ASN1_OTHER))
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usetag = 0;
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else
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usetag = 1;
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/* -1 means omit type */
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if (len == -1)
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return 0;
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/* -2 return is special meaning use ndef */
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if (len == -2) {
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ndef = 2;
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len = 0;
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}
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/* If not implicitly tagged get tag from underlying type */
|
|
if (tag == -1)
|
|
tag = utype;
|
|
|
|
/* Output tag+length followed by content octets */
|
|
if (out) {
|
|
if (usetag)
|
|
ASN1_put_object(out, ndef, len, tag, aclass);
|
|
asn1_ex_i2c(pval, *out, &utype, it);
|
|
if (ndef)
|
|
ASN1_put_eoc(out);
|
|
else
|
|
*out += len;
|
|
}
|
|
|
|
if (usetag)
|
|
return ASN1_object_size(ndef, len, tag);
|
|
return len;
|
|
}
|
|
|
|
/* Produce content octets from a structure */
|
|
|
|
static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
|
|
const ASN1_ITEM *it)
|
|
{
|
|
ASN1_BOOLEAN *tbool = NULL;
|
|
ASN1_STRING *strtmp;
|
|
ASN1_OBJECT *otmp;
|
|
int utype;
|
|
const unsigned char *cont;
|
|
unsigned char c;
|
|
int len;
|
|
const ASN1_PRIMITIVE_FUNCS *pf;
|
|
pf = it->funcs;
|
|
if (pf && pf->prim_i2c)
|
|
return pf->prim_i2c(pval, cout, putype, it);
|
|
|
|
/* Should type be omitted? */
|
|
if ((it->itype != ASN1_ITYPE_PRIMITIVE)
|
|
|| (it->utype != V_ASN1_BOOLEAN)) {
|
|
if (!*pval)
|
|
return -1;
|
|
}
|
|
|
|
if (it->itype == ASN1_ITYPE_MSTRING) {
|
|
/* If MSTRING type set the underlying type */
|
|
strtmp = (ASN1_STRING *)*pval;
|
|
utype = strtmp->type;
|
|
*putype = utype;
|
|
} else if (it->utype == V_ASN1_ANY) {
|
|
/* If ANY set type and pointer to value */
|
|
ASN1_TYPE *typ;
|
|
typ = (ASN1_TYPE *)*pval;
|
|
utype = typ->type;
|
|
*putype = utype;
|
|
pval = &typ->value.asn1_value;
|
|
} else
|
|
utype = *putype;
|
|
|
|
switch (utype) {
|
|
case V_ASN1_OBJECT:
|
|
otmp = (ASN1_OBJECT *)*pval;
|
|
cont = otmp->data;
|
|
len = otmp->length;
|
|
if (cont == NULL || len == 0)
|
|
return -1;
|
|
break;
|
|
|
|
case V_ASN1_NULL:
|
|
cont = NULL;
|
|
len = 0;
|
|
break;
|
|
|
|
case V_ASN1_BOOLEAN:
|
|
tbool = (ASN1_BOOLEAN *)pval;
|
|
if (*tbool == -1)
|
|
return -1;
|
|
if (it->utype != V_ASN1_ANY) {
|
|
/*
|
|
* Default handling if value == size field then omit
|
|
*/
|
|
if (*tbool && (it->size > 0))
|
|
return -1;
|
|
if (!*tbool && !it->size)
|
|
return -1;
|
|
}
|
|
c = (unsigned char)*tbool;
|
|
cont = &c;
|
|
len = 1;
|
|
break;
|
|
|
|
case V_ASN1_BIT_STRING:
|
|
return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
|
|
cout ? &cout : NULL);
|
|
|
|
case V_ASN1_INTEGER:
|
|
case V_ASN1_ENUMERATED:
|
|
/*
|
|
* These are all have the same content format as ASN1_INTEGER
|
|
*/
|
|
return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL);
|
|
|
|
case V_ASN1_OCTET_STRING:
|
|
case V_ASN1_NUMERICSTRING:
|
|
case V_ASN1_PRINTABLESTRING:
|
|
case V_ASN1_T61STRING:
|
|
case V_ASN1_VIDEOTEXSTRING:
|
|
case V_ASN1_IA5STRING:
|
|
case V_ASN1_UTCTIME:
|
|
case V_ASN1_GENERALIZEDTIME:
|
|
case V_ASN1_GRAPHICSTRING:
|
|
case V_ASN1_VISIBLESTRING:
|
|
case V_ASN1_GENERALSTRING:
|
|
case V_ASN1_UNIVERSALSTRING:
|
|
case V_ASN1_BMPSTRING:
|
|
case V_ASN1_UTF8STRING:
|
|
case V_ASN1_SEQUENCE:
|
|
case V_ASN1_SET:
|
|
default:
|
|
/* All based on ASN1_STRING and handled the same */
|
|
strtmp = (ASN1_STRING *)*pval;
|
|
/* Special handling for NDEF */
|
|
if ((it->size == ASN1_TFLG_NDEF)
|
|
&& (strtmp->flags & ASN1_STRING_FLAG_NDEF)) {
|
|
if (cout) {
|
|
strtmp->data = cout;
|
|
strtmp->length = 0;
|
|
}
|
|
/* Special return code */
|
|
return -2;
|
|
}
|
|
cont = strtmp->data;
|
|
len = strtmp->length;
|
|
|
|
break;
|
|
|
|
}
|
|
if (cout && len)
|
|
memcpy(cout, cont, len);
|
|
return len;
|
|
}
|