[331] | 1 | /*
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| 2 | * Copyright 2000-2016 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 <stddef.h>
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| 11 | #include <string.h>
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| 12 | #include <openssl/asn1.h>
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| 13 | #include <openssl/asn1t.h>
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| 14 | #include <openssl/objects.h>
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| 15 | #include <openssl/buffer.h>
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| 16 | #include <openssl/err.h>
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| 17 | #include "internal/numbers.h"
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| 18 | #include "asn1_locl.h"
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| 19 |
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| 20 | static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
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| 21 | long len, const ASN1_ITEM *it,
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| 22 | int tag, int aclass, char opt, ASN1_TLC *ctx);
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| 23 |
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| 24 | static int asn1_check_eoc(const unsigned char **in, long len);
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| 25 | static int asn1_find_end(const unsigned char **in, long len, char inf);
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| 26 |
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| 27 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
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| 28 | char inf, int tag, int aclass, int depth);
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| 29 |
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| 30 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
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| 31 |
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| 32 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
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| 33 | char *inf, char *cst,
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| 34 | const unsigned char **in, long len,
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| 35 | int exptag, int expclass, char opt, ASN1_TLC *ctx);
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| 36 |
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| 37 | static int asn1_template_ex_d2i(ASN1_VALUE **pval,
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| 38 | const unsigned char **in, long len,
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| 39 | const ASN1_TEMPLATE *tt, char opt,
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| 40 | ASN1_TLC *ctx);
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| 41 | static int asn1_template_noexp_d2i(ASN1_VALUE **val,
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| 42 | const unsigned char **in, long len,
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| 43 | const ASN1_TEMPLATE *tt, char opt,
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| 44 | ASN1_TLC *ctx);
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| 45 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
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| 46 | const unsigned char **in, long len,
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| 47 | const ASN1_ITEM *it,
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| 48 | int tag, int aclass, char opt,
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| 49 | ASN1_TLC *ctx);
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| 50 | static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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| 51 | int utype, char *free_cont, const ASN1_ITEM *it);
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| 52 |
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| 53 | /* Table to convert tags to bit values, used for MSTRING type */
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| 54 | static const unsigned long tag2bit[32] = {
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| 55 | /* tags 0 - 3 */
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| 56 | 0, 0, 0, B_ASN1_BIT_STRING,
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| 57 | /* tags 4- 7 */
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| 58 | B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
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| 59 | /* tags 8-11 */
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| 60 | B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
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| 61 | /* tags 12-15 */
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| 62 | B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
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| 63 | /* tags 16-19 */
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| 64 | B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
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| 65 | /* tags 20-22 */
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| 66 | B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
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| 67 | /* tags 23-24 */
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| 68 | B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
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| 69 | /* tags 25-27 */
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| 70 | B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
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| 71 | /* tags 28-31 */
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| 72 | B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
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| 73 | };
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| 74 |
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| 75 | unsigned long ASN1_tag2bit(int tag)
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| 76 | {
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| 77 | if ((tag < 0) || (tag > 30))
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| 78 | return 0;
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| 79 | return tag2bit[tag];
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| 80 | }
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| 81 |
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| 82 | /* Macro to initialize and invalidate the cache */
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| 83 |
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| 84 | #define asn1_tlc_clear(c) if (c) (c)->valid = 0
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| 85 | /* Version to avoid compiler warning about 'c' always non-NULL */
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| 86 | #define asn1_tlc_clear_nc(c) (c)->valid = 0
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| 87 |
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| 88 | /*
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| 89 | * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
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| 90 | * function. 'in' points to a buffer to read the data from, in future we
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| 91 | * will have more advanced versions that can input data a piece at a time and
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| 92 | * this will simply be a special case.
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| 93 | */
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| 94 |
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| 95 | ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
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| 96 | const unsigned char **in, long len,
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| 97 | const ASN1_ITEM *it)
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| 98 | {
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| 99 | ASN1_TLC c;
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| 100 | ASN1_VALUE *ptmpval = NULL;
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| 101 | if (!pval)
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| 102 | pval = &ptmpval;
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| 103 | asn1_tlc_clear_nc(&c);
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| 104 | if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
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| 105 | return *pval;
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| 106 | return NULL;
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| 107 | }
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| 108 |
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| 109 | int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
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| 110 | const ASN1_ITEM *it,
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| 111 | int tag, int aclass, char opt, ASN1_TLC *ctx)
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| 112 | {
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| 113 | int rv;
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| 114 | rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx);
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| 115 | if (rv <= 0)
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| 116 | ASN1_item_ex_free(pval, it);
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| 117 | return rv;
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| 118 | }
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| 119 |
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| 120 | /*
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| 121 | * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
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| 122 | * tag mismatch return -1 to handle OPTIONAL
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| 123 | */
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| 124 |
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| 125 | static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
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| 126 | long len, const ASN1_ITEM *it,
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| 127 | int tag, int aclass, char opt, ASN1_TLC *ctx)
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| 128 | {
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| 129 | const ASN1_TEMPLATE *tt, *errtt = NULL;
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| 130 | const ASN1_EXTERN_FUNCS *ef;
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| 131 | const ASN1_AUX *aux = it->funcs;
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| 132 | ASN1_aux_cb *asn1_cb;
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| 133 | const unsigned char *p = NULL, *q;
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| 134 | unsigned char oclass;
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| 135 | char seq_eoc, seq_nolen, cst, isopt;
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| 136 | long tmplen;
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| 137 | int i;
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| 138 | int otag;
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| 139 | int ret = 0;
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| 140 | ASN1_VALUE **pchptr;
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| 141 | if (!pval)
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| 142 | return 0;
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| 143 | if (aux && aux->asn1_cb)
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| 144 | asn1_cb = aux->asn1_cb;
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| 145 | else
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| 146 | asn1_cb = 0;
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| 147 |
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| 148 | switch (it->itype) {
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| 149 | case ASN1_ITYPE_PRIMITIVE:
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| 150 | if (it->templates) {
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| 151 | /*
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| 152 | * tagging or OPTIONAL is currently illegal on an item template
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| 153 | * because the flags can't get passed down. In practice this
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| 154 | * isn't a problem: we include the relevant flags from the item
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| 155 | * template in the template itself.
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| 156 | */
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| 157 | if ((tag != -1) || opt) {
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| 158 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I,
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| 159 | ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
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| 160 | goto err;
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| 161 | }
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| 162 | return asn1_template_ex_d2i(pval, in, len,
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| 163 | it->templates, opt, ctx);
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| 164 | }
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| 165 | return asn1_d2i_ex_primitive(pval, in, len, it,
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| 166 | tag, aclass, opt, ctx);
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| 167 |
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| 168 | case ASN1_ITYPE_MSTRING:
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| 169 | p = *in;
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| 170 | /* Just read in tag and class */
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| 171 | ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
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| 172 | &p, len, -1, 0, 1, ctx);
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| 173 | if (!ret) {
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| 174 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
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| 175 | goto err;
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| 176 | }
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| 177 |
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| 178 | /* Must be UNIVERSAL class */
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| 179 | if (oclass != V_ASN1_UNIVERSAL) {
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| 180 | /* If OPTIONAL, assume this is OK */
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| 181 | if (opt)
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| 182 | return -1;
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| 183 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
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| 184 | goto err;
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| 185 | }
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| 186 | /* Check tag matches bit map */
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| 187 | if (!(ASN1_tag2bit(otag) & it->utype)) {
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| 188 | /* If OPTIONAL, assume this is OK */
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| 189 | if (opt)
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| 190 | return -1;
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| 191 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_WRONG_TAG);
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| 192 | goto err;
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| 193 | }
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| 194 | return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
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| 195 |
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| 196 | case ASN1_ITYPE_EXTERN:
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| 197 | /* Use new style d2i */
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| 198 | ef = it->funcs;
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| 199 | return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
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| 200 |
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| 201 | case ASN1_ITYPE_CHOICE:
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| 202 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
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| 203 | goto auxerr;
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| 204 | if (*pval) {
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| 205 | /* Free up and zero CHOICE value if initialised */
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| 206 | i = asn1_get_choice_selector(pval, it);
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| 207 | if ((i >= 0) && (i < it->tcount)) {
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| 208 | tt = it->templates + i;
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| 209 | pchptr = asn1_get_field_ptr(pval, tt);
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| 210 | asn1_template_free(pchptr, tt);
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| 211 | asn1_set_choice_selector(pval, -1, it);
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| 212 | }
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| 213 | } else if (!ASN1_item_ex_new(pval, it)) {
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| 214 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
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| 215 | goto err;
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| 216 | }
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| 217 | /* CHOICE type, try each possibility in turn */
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| 218 | p = *in;
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| 219 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
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| 220 | pchptr = asn1_get_field_ptr(pval, tt);
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| 221 | /*
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| 222 | * We mark field as OPTIONAL so its absence can be recognised.
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| 223 | */
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| 224 | ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
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| 225 | /* If field not present, try the next one */
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| 226 | if (ret == -1)
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| 227 | continue;
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| 228 | /* If positive return, read OK, break loop */
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| 229 | if (ret > 0)
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| 230 | break;
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| 231 | /*
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| 232 | * Must be an ASN1 parsing error.
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| 233 | * Free up any partial choice value
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| 234 | */
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| 235 | asn1_template_free(pchptr, tt);
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| 236 | errtt = tt;
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| 237 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
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| 238 | goto err;
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| 239 | }
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| 240 |
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| 241 | /* Did we fall off the end without reading anything? */
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| 242 | if (i == it->tcount) {
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| 243 | /* If OPTIONAL, this is OK */
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| 244 | if (opt) {
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| 245 | /* Free and zero it */
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| 246 | ASN1_item_ex_free(pval, it);
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| 247 | return -1;
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| 248 | }
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| 249 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
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| 250 | goto err;
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| 251 | }
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| 252 |
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| 253 | asn1_set_choice_selector(pval, i, it);
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| 254 |
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| 255 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
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| 256 | goto auxerr;
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| 257 | *in = p;
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| 258 | return 1;
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| 259 |
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| 260 | case ASN1_ITYPE_NDEF_SEQUENCE:
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| 261 | case ASN1_ITYPE_SEQUENCE:
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| 262 | p = *in;
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| 263 | tmplen = len;
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| 264 |
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| 265 | /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
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| 266 | if (tag == -1) {
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| 267 | tag = V_ASN1_SEQUENCE;
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| 268 | aclass = V_ASN1_UNIVERSAL;
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| 269 | }
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| 270 | /* Get SEQUENCE length and update len, p */
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| 271 | ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
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| 272 | &p, len, tag, aclass, opt, ctx);
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| 273 | if (!ret) {
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| 274 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
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| 275 | goto err;
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| 276 | } else if (ret == -1)
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| 277 | return -1;
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| 278 | if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
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| 279 | len = tmplen - (p - *in);
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| 280 | seq_nolen = 1;
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| 281 | }
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| 282 | /* If indefinite we don't do a length check */
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| 283 | else
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| 284 | seq_nolen = seq_eoc;
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| 285 | if (!cst) {
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| 286 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
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| 287 | goto err;
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| 288 | }
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| 289 |
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| 290 | if (!*pval && !ASN1_item_ex_new(pval, it)) {
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| 291 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
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| 292 | goto err;
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| 293 | }
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| 294 |
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| 295 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
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| 296 | goto auxerr;
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| 297 |
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| 298 | /* Free up and zero any ADB found */
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| 299 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
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| 300 | if (tt->flags & ASN1_TFLG_ADB_MASK) {
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| 301 | const ASN1_TEMPLATE *seqtt;
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| 302 | ASN1_VALUE **pseqval;
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| 303 | seqtt = asn1_do_adb(pval, tt, 0);
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| 304 | if (seqtt == NULL)
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| 305 | continue;
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| 306 | pseqval = asn1_get_field_ptr(pval, seqtt);
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| 307 | asn1_template_free(pseqval, seqtt);
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| 308 | }
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| 309 | }
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| 310 |
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| 311 | /* Get each field entry */
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| 312 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
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| 313 | const ASN1_TEMPLATE *seqtt;
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| 314 | ASN1_VALUE **pseqval;
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| 315 | seqtt = asn1_do_adb(pval, tt, 1);
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| 316 | if (seqtt == NULL)
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| 317 | goto err;
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| 318 | pseqval = asn1_get_field_ptr(pval, seqtt);
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| 319 | /* Have we ran out of data? */
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| 320 | if (!len)
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| 321 | break;
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| 322 | q = p;
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| 323 | if (asn1_check_eoc(&p, len)) {
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| 324 | if (!seq_eoc) {
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| 325 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_UNEXPECTED_EOC);
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| 326 | goto err;
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| 327 | }
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| 328 | len -= p - q;
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| 329 | seq_eoc = 0;
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| 330 | q = p;
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| 331 | break;
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| 332 | }
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| 333 | /*
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| 334 | * This determines the OPTIONAL flag value. The field cannot be
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| 335 | * omitted if it is the last of a SEQUENCE and there is still
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| 336 | * data to be read. This isn't strictly necessary but it
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| 337 | * increases efficiency in some cases.
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| 338 | */
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| 339 | if (i == (it->tcount - 1))
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| 340 | isopt = 0;
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| 341 | else
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| 342 | isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
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| 343 | /*
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| 344 | * attempt to read in field, allowing each to be OPTIONAL
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| 345 | */
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| 346 |
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| 347 | ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
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| 348 | if (!ret) {
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| 349 | errtt = seqtt;
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| 350 | goto err;
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| 351 | } else if (ret == -1) {
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| 352 | /*
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| 353 | * OPTIONAL component absent. Free and zero the field.
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| 354 | */
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| 355 | asn1_template_free(pseqval, seqtt);
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| 356 | continue;
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| 357 | }
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| 358 | /* Update length */
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| 359 | len -= p - q;
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| 360 | }
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| 361 |
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| 362 | /* Check for EOC if expecting one */
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| 363 | if (seq_eoc && !asn1_check_eoc(&p, len)) {
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| 364 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MISSING_EOC);
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| 365 | goto err;
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| 366 | }
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| 367 | /* Check all data read */
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| 368 | if (!seq_nolen && len) {
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| 369 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
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| 370 | goto err;
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| 371 | }
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| 372 |
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| 373 | /*
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| 374 | * If we get here we've got no more data in the SEQUENCE, however we
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| 375 | * may not have read all fields so check all remaining are OPTIONAL
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| 376 | * and clear any that are.
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| 377 | */
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| 378 | for (; i < it->tcount; tt++, i++) {
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| 379 | const ASN1_TEMPLATE *seqtt;
|
---|
| 380 | seqtt = asn1_do_adb(pval, tt, 1);
|
---|
| 381 | if (seqtt == NULL)
|
---|
| 382 | goto err;
|
---|
| 383 | if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
|
---|
| 384 | ASN1_VALUE **pseqval;
|
---|
| 385 | pseqval = asn1_get_field_ptr(pval, seqtt);
|
---|
| 386 | asn1_template_free(pseqval, seqtt);
|
---|
| 387 | } else {
|
---|
| 388 | errtt = seqtt;
|
---|
| 389 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_FIELD_MISSING);
|
---|
| 390 | goto err;
|
---|
| 391 | }
|
---|
| 392 | }
|
---|
| 393 | /* Save encoding */
|
---|
| 394 | if (!asn1_enc_save(pval, *in, p - *in, it))
|
---|
| 395 | goto auxerr;
|
---|
| 396 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
|
---|
| 397 | goto auxerr;
|
---|
| 398 | *in = p;
|
---|
| 399 | return 1;
|
---|
| 400 |
|
---|
| 401 | default:
|
---|
| 402 | return 0;
|
---|
| 403 | }
|
---|
| 404 | auxerr:
|
---|
| 405 | ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_AUX_ERROR);
|
---|
| 406 | err:
|
---|
| 407 | if (errtt)
|
---|
| 408 | ERR_add_error_data(4, "Field=", errtt->field_name,
|
---|
| 409 | ", Type=", it->sname);
|
---|
| 410 | else
|
---|
| 411 | ERR_add_error_data(2, "Type=", it->sname);
|
---|
| 412 | return 0;
|
---|
| 413 | }
|
---|
| 414 |
|
---|
| 415 | /*
|
---|
| 416 | * Templates are handled with two separate functions. One handles any
|
---|
| 417 | * EXPLICIT tag and the other handles the rest.
|
---|
| 418 | */
|
---|
| 419 |
|
---|
| 420 | static int asn1_template_ex_d2i(ASN1_VALUE **val,
|
---|
| 421 | const unsigned char **in, long inlen,
|
---|
| 422 | const ASN1_TEMPLATE *tt, char opt,
|
---|
| 423 | ASN1_TLC *ctx)
|
---|
| 424 | {
|
---|
| 425 | int flags, aclass;
|
---|
| 426 | int ret;
|
---|
| 427 | long len;
|
---|
| 428 | const unsigned char *p, *q;
|
---|
| 429 | char exp_eoc;
|
---|
| 430 | if (!val)
|
---|
| 431 | return 0;
|
---|
| 432 | flags = tt->flags;
|
---|
| 433 | aclass = flags & ASN1_TFLG_TAG_CLASS;
|
---|
| 434 |
|
---|
| 435 | p = *in;
|
---|
| 436 |
|
---|
| 437 | /* Check if EXPLICIT tag expected */
|
---|
| 438 | if (flags & ASN1_TFLG_EXPTAG) {
|
---|
| 439 | char cst;
|
---|
| 440 | /*
|
---|
| 441 | * Need to work out amount of data available to the inner content and
|
---|
| 442 | * where it starts: so read in EXPLICIT header to get the info.
|
---|
| 443 | */
|
---|
| 444 | ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
|
---|
| 445 | &p, inlen, tt->tag, aclass, opt, ctx);
|
---|
| 446 | q = p;
|
---|
| 447 | if (!ret) {
|
---|
| 448 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 449 | return 0;
|
---|
| 450 | } else if (ret == -1)
|
---|
| 451 | return -1;
|
---|
| 452 | if (!cst) {
|
---|
| 453 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
|
---|
| 454 | ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
|
---|
| 455 | return 0;
|
---|
| 456 | }
|
---|
| 457 | /* We've found the field so it can't be OPTIONAL now */
|
---|
| 458 | ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
|
---|
| 459 | if (!ret) {
|
---|
| 460 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 461 | return 0;
|
---|
| 462 | }
|
---|
| 463 | /* We read the field in OK so update length */
|
---|
| 464 | len -= p - q;
|
---|
| 465 | if (exp_eoc) {
|
---|
| 466 | /* If NDEF we must have an EOC here */
|
---|
| 467 | if (!asn1_check_eoc(&p, len)) {
|
---|
| 468 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC);
|
---|
| 469 | goto err;
|
---|
| 470 | }
|
---|
| 471 | } else {
|
---|
| 472 | /*
|
---|
| 473 | * Otherwise we must hit the EXPLICIT tag end or its an error
|
---|
| 474 | */
|
---|
| 475 | if (len) {
|
---|
| 476 | ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
|
---|
| 477 | ASN1_R_EXPLICIT_LENGTH_MISMATCH);
|
---|
| 478 | goto err;
|
---|
| 479 | }
|
---|
| 480 | }
|
---|
| 481 | } else
|
---|
| 482 | return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
|
---|
| 483 |
|
---|
| 484 | *in = p;
|
---|
| 485 | return 1;
|
---|
| 486 |
|
---|
| 487 | err:
|
---|
| 488 | return 0;
|
---|
| 489 | }
|
---|
| 490 |
|
---|
| 491 | static int asn1_template_noexp_d2i(ASN1_VALUE **val,
|
---|
| 492 | const unsigned char **in, long len,
|
---|
| 493 | const ASN1_TEMPLATE *tt, char opt,
|
---|
| 494 | ASN1_TLC *ctx)
|
---|
| 495 | {
|
---|
| 496 | int flags, aclass;
|
---|
| 497 | int ret;
|
---|
| 498 | ASN1_VALUE *tval;
|
---|
| 499 | const unsigned char *p, *q;
|
---|
| 500 | if (!val)
|
---|
| 501 | return 0;
|
---|
| 502 | flags = tt->flags;
|
---|
| 503 | aclass = flags & ASN1_TFLG_TAG_CLASS;
|
---|
| 504 |
|
---|
| 505 | p = *in;
|
---|
| 506 | q = p;
|
---|
| 507 |
|
---|
| 508 | /*
|
---|
| 509 | * If field is embedded then val needs fixing so it is a pointer to
|
---|
| 510 | * a pointer to a field.
|
---|
| 511 | */
|
---|
| 512 | if (tt->flags & ASN1_TFLG_EMBED) {
|
---|
| 513 | tval = (ASN1_VALUE *)val;
|
---|
| 514 | val = &tval;
|
---|
| 515 | }
|
---|
| 516 |
|
---|
| 517 | if (flags & ASN1_TFLG_SK_MASK) {
|
---|
| 518 | /* SET OF, SEQUENCE OF */
|
---|
| 519 | int sktag, skaclass;
|
---|
| 520 | char sk_eoc;
|
---|
| 521 | /* First work out expected inner tag value */
|
---|
| 522 | if (flags & ASN1_TFLG_IMPTAG) {
|
---|
| 523 | sktag = tt->tag;
|
---|
| 524 | skaclass = aclass;
|
---|
| 525 | } else {
|
---|
| 526 | skaclass = V_ASN1_UNIVERSAL;
|
---|
| 527 | if (flags & ASN1_TFLG_SET_OF)
|
---|
| 528 | sktag = V_ASN1_SET;
|
---|
| 529 | else
|
---|
| 530 | sktag = V_ASN1_SEQUENCE;
|
---|
| 531 | }
|
---|
| 532 | /* Get the tag */
|
---|
| 533 | ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
|
---|
| 534 | &p, len, sktag, skaclass, opt, ctx);
|
---|
| 535 | if (!ret) {
|
---|
| 536 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 537 | return 0;
|
---|
| 538 | } else if (ret == -1)
|
---|
| 539 | return -1;
|
---|
| 540 | if (!*val)
|
---|
| 541 | *val = (ASN1_VALUE *)OPENSSL_sk_new_null();
|
---|
| 542 | else {
|
---|
| 543 | /*
|
---|
| 544 | * We've got a valid STACK: free up any items present
|
---|
| 545 | */
|
---|
| 546 | STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
|
---|
| 547 | ASN1_VALUE *vtmp;
|
---|
| 548 | while (sk_ASN1_VALUE_num(sktmp) > 0) {
|
---|
| 549 | vtmp = sk_ASN1_VALUE_pop(sktmp);
|
---|
| 550 | ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
|
---|
| 551 | }
|
---|
| 552 | }
|
---|
| 553 |
|
---|
| 554 | if (!*val) {
|
---|
| 555 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
|
---|
| 556 | goto err;
|
---|
| 557 | }
|
---|
| 558 |
|
---|
| 559 | /* Read as many items as we can */
|
---|
| 560 | while (len > 0) {
|
---|
| 561 | ASN1_VALUE *skfield;
|
---|
| 562 | q = p;
|
---|
| 563 | /* See if EOC found */
|
---|
| 564 | if (asn1_check_eoc(&p, len)) {
|
---|
| 565 | if (!sk_eoc) {
|
---|
| 566 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
|
---|
| 567 | ASN1_R_UNEXPECTED_EOC);
|
---|
| 568 | goto err;
|
---|
| 569 | }
|
---|
| 570 | len -= p - q;
|
---|
| 571 | sk_eoc = 0;
|
---|
| 572 | break;
|
---|
| 573 | }
|
---|
| 574 | skfield = NULL;
|
---|
| 575 | if (!asn1_item_embed_d2i(&skfield, &p, len,
|
---|
| 576 | ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
|
---|
| 577 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
|
---|
| 578 | ERR_R_NESTED_ASN1_ERROR);
|
---|
| 579 | /* |skfield| may be partially allocated despite failure. */
|
---|
| 580 | ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
|
---|
| 581 | goto err;
|
---|
| 582 | }
|
---|
| 583 | len -= p - q;
|
---|
| 584 | if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
|
---|
| 585 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
|
---|
| 586 | ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
|
---|
| 587 | goto err;
|
---|
| 588 | }
|
---|
| 589 | }
|
---|
| 590 | if (sk_eoc) {
|
---|
| 591 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
|
---|
| 592 | goto err;
|
---|
| 593 | }
|
---|
| 594 | } else if (flags & ASN1_TFLG_IMPTAG) {
|
---|
| 595 | /* IMPLICIT tagging */
|
---|
| 596 | ret = asn1_item_embed_d2i(val, &p, len,
|
---|
| 597 | ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
|
---|
| 598 | ctx);
|
---|
| 599 | if (!ret) {
|
---|
| 600 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 601 | goto err;
|
---|
| 602 | } else if (ret == -1)
|
---|
| 603 | return -1;
|
---|
| 604 | } else {
|
---|
| 605 | /* Nothing special */
|
---|
| 606 | ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
|
---|
| 607 | -1, 0, opt, ctx);
|
---|
| 608 | if (!ret) {
|
---|
| 609 | ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 610 | goto err;
|
---|
| 611 | } else if (ret == -1)
|
---|
| 612 | return -1;
|
---|
| 613 | }
|
---|
| 614 |
|
---|
| 615 | *in = p;
|
---|
| 616 | return 1;
|
---|
| 617 |
|
---|
| 618 | err:
|
---|
| 619 | return 0;
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
|
---|
| 623 | const unsigned char **in, long inlen,
|
---|
| 624 | const ASN1_ITEM *it,
|
---|
| 625 | int tag, int aclass, char opt, ASN1_TLC *ctx)
|
---|
| 626 | {
|
---|
| 627 | int ret = 0, utype;
|
---|
| 628 | long plen;
|
---|
| 629 | char cst, inf, free_cont = 0;
|
---|
| 630 | const unsigned char *p;
|
---|
| 631 | BUF_MEM buf = { 0, NULL, 0, 0 };
|
---|
| 632 | const unsigned char *cont = NULL;
|
---|
| 633 | long len;
|
---|
| 634 | if (!pval) {
|
---|
| 635 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
|
---|
| 636 | return 0; /* Should never happen */
|
---|
| 637 | }
|
---|
| 638 |
|
---|
| 639 | if (it->itype == ASN1_ITYPE_MSTRING) {
|
---|
| 640 | utype = tag;
|
---|
| 641 | tag = -1;
|
---|
| 642 | } else
|
---|
| 643 | utype = it->utype;
|
---|
| 644 |
|
---|
| 645 | if (utype == V_ASN1_ANY) {
|
---|
| 646 | /* If type is ANY need to figure out type from tag */
|
---|
| 647 | unsigned char oclass;
|
---|
| 648 | if (tag >= 0) {
|
---|
| 649 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
|
---|
| 650 | return 0;
|
---|
| 651 | }
|
---|
| 652 | if (opt) {
|
---|
| 653 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
|
---|
| 654 | ASN1_R_ILLEGAL_OPTIONAL_ANY);
|
---|
| 655 | return 0;
|
---|
| 656 | }
|
---|
| 657 | p = *in;
|
---|
| 658 | ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
|
---|
| 659 | &p, inlen, -1, 0, 0, ctx);
|
---|
| 660 | if (!ret) {
|
---|
| 661 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 662 | return 0;
|
---|
| 663 | }
|
---|
| 664 | if (oclass != V_ASN1_UNIVERSAL)
|
---|
| 665 | utype = V_ASN1_OTHER;
|
---|
| 666 | }
|
---|
| 667 | if (tag == -1) {
|
---|
| 668 | tag = utype;
|
---|
| 669 | aclass = V_ASN1_UNIVERSAL;
|
---|
| 670 | }
|
---|
| 671 | p = *in;
|
---|
| 672 | /* Check header */
|
---|
| 673 | ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
|
---|
| 674 | &p, inlen, tag, aclass, opt, ctx);
|
---|
| 675 | if (!ret) {
|
---|
| 676 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 677 | return 0;
|
---|
| 678 | } else if (ret == -1)
|
---|
| 679 | return -1;
|
---|
| 680 | ret = 0;
|
---|
| 681 | /* SEQUENCE, SET and "OTHER" are left in encoded form */
|
---|
| 682 | if ((utype == V_ASN1_SEQUENCE)
|
---|
| 683 | || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
|
---|
| 684 | /*
|
---|
| 685 | * Clear context cache for type OTHER because the auto clear when we
|
---|
| 686 | * have a exact match won't work
|
---|
| 687 | */
|
---|
| 688 | if (utype == V_ASN1_OTHER) {
|
---|
| 689 | asn1_tlc_clear(ctx);
|
---|
| 690 | }
|
---|
| 691 | /* SEQUENCE and SET must be constructed */
|
---|
| 692 | else if (!cst) {
|
---|
| 693 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
|
---|
| 694 | ASN1_R_TYPE_NOT_CONSTRUCTED);
|
---|
| 695 | return 0;
|
---|
| 696 | }
|
---|
| 697 |
|
---|
| 698 | cont = *in;
|
---|
| 699 | /* If indefinite length constructed find the real end */
|
---|
| 700 | if (inf) {
|
---|
| 701 | if (!asn1_find_end(&p, plen, inf))
|
---|
| 702 | goto err;
|
---|
| 703 | len = p - cont;
|
---|
| 704 | } else {
|
---|
| 705 | len = p - cont + plen;
|
---|
| 706 | p += plen;
|
---|
| 707 | }
|
---|
| 708 | } else if (cst) {
|
---|
| 709 | if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
|
---|
| 710 | || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
|
---|
| 711 | || utype == V_ASN1_ENUMERATED) {
|
---|
| 712 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE);
|
---|
| 713 | return 0;
|
---|
| 714 | }
|
---|
| 715 |
|
---|
| 716 | /* Free any returned 'buf' content */
|
---|
| 717 | free_cont = 1;
|
---|
| 718 | /*
|
---|
| 719 | * Should really check the internal tags are correct but some things
|
---|
| 720 | * may get this wrong. The relevant specs say that constructed string
|
---|
| 721 | * types should be OCTET STRINGs internally irrespective of the type.
|
---|
| 722 | * So instead just check for UNIVERSAL class and ignore the tag.
|
---|
| 723 | */
|
---|
| 724 | if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
|
---|
| 725 | goto err;
|
---|
| 726 | }
|
---|
| 727 | len = buf.length;
|
---|
| 728 | /* Append a final null to string */
|
---|
| 729 | if (!BUF_MEM_grow_clean(&buf, len + 1)) {
|
---|
| 730 | ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
|
---|
| 731 | goto err;
|
---|
| 732 | }
|
---|
| 733 | buf.data[len] = 0;
|
---|
| 734 | cont = (const unsigned char *)buf.data;
|
---|
| 735 | } else {
|
---|
| 736 | cont = p;
|
---|
| 737 | len = plen;
|
---|
| 738 | p += plen;
|
---|
| 739 | }
|
---|
| 740 |
|
---|
| 741 | /* We now have content length and type: translate into a structure */
|
---|
| 742 | /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
|
---|
| 743 | if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
|
---|
| 744 | goto err;
|
---|
| 745 |
|
---|
| 746 | *in = p;
|
---|
| 747 | ret = 1;
|
---|
| 748 | err:
|
---|
| 749 | if (free_cont)
|
---|
| 750 | OPENSSL_free(buf.data);
|
---|
| 751 | return ret;
|
---|
| 752 | }
|
---|
| 753 |
|
---|
| 754 | /* Translate ASN1 content octets into a structure */
|
---|
| 755 |
|
---|
| 756 | static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
---|
| 757 | int utype, char *free_cont, const ASN1_ITEM *it)
|
---|
| 758 | {
|
---|
| 759 | ASN1_VALUE **opval = NULL;
|
---|
| 760 | ASN1_STRING *stmp;
|
---|
| 761 | ASN1_TYPE *typ = NULL;
|
---|
| 762 | int ret = 0;
|
---|
| 763 | const ASN1_PRIMITIVE_FUNCS *pf;
|
---|
| 764 | ASN1_INTEGER **tint;
|
---|
| 765 | pf = it->funcs;
|
---|
| 766 |
|
---|
| 767 | if (pf && pf->prim_c2i)
|
---|
| 768 | return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
|
---|
| 769 | /* If ANY type clear type and set pointer to internal value */
|
---|
| 770 | if (it->utype == V_ASN1_ANY) {
|
---|
| 771 | if (!*pval) {
|
---|
| 772 | typ = ASN1_TYPE_new();
|
---|
| 773 | if (typ == NULL)
|
---|
| 774 | goto err;
|
---|
| 775 | *pval = (ASN1_VALUE *)typ;
|
---|
| 776 | } else
|
---|
| 777 | typ = (ASN1_TYPE *)*pval;
|
---|
| 778 |
|
---|
| 779 | if (utype != typ->type)
|
---|
| 780 | ASN1_TYPE_set(typ, utype, NULL);
|
---|
| 781 | opval = pval;
|
---|
| 782 | pval = &typ->value.asn1_value;
|
---|
| 783 | }
|
---|
| 784 | switch (utype) {
|
---|
| 785 | case V_ASN1_OBJECT:
|
---|
| 786 | if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
|
---|
| 787 | goto err;
|
---|
| 788 | break;
|
---|
| 789 |
|
---|
| 790 | case V_ASN1_NULL:
|
---|
| 791 | if (len) {
|
---|
| 792 | ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH);
|
---|
| 793 | goto err;
|
---|
| 794 | }
|
---|
| 795 | *pval = (ASN1_VALUE *)1;
|
---|
| 796 | break;
|
---|
| 797 |
|
---|
| 798 | case V_ASN1_BOOLEAN:
|
---|
| 799 | if (len != 1) {
|
---|
| 800 | ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
|
---|
| 801 | goto err;
|
---|
| 802 | } else {
|
---|
| 803 | ASN1_BOOLEAN *tbool;
|
---|
| 804 | tbool = (ASN1_BOOLEAN *)pval;
|
---|
| 805 | *tbool = *cont;
|
---|
| 806 | }
|
---|
| 807 | break;
|
---|
| 808 |
|
---|
| 809 | case V_ASN1_BIT_STRING:
|
---|
| 810 | if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
|
---|
| 811 | goto err;
|
---|
| 812 | break;
|
---|
| 813 |
|
---|
| 814 | case V_ASN1_INTEGER:
|
---|
| 815 | case V_ASN1_ENUMERATED:
|
---|
| 816 | tint = (ASN1_INTEGER **)pval;
|
---|
| 817 | if (!c2i_ASN1_INTEGER(tint, &cont, len))
|
---|
| 818 | goto err;
|
---|
| 819 | /* Fixup type to match the expected form */
|
---|
| 820 | (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
|
---|
| 821 | break;
|
---|
| 822 |
|
---|
| 823 | case V_ASN1_OCTET_STRING:
|
---|
| 824 | case V_ASN1_NUMERICSTRING:
|
---|
| 825 | case V_ASN1_PRINTABLESTRING:
|
---|
| 826 | case V_ASN1_T61STRING:
|
---|
| 827 | case V_ASN1_VIDEOTEXSTRING:
|
---|
| 828 | case V_ASN1_IA5STRING:
|
---|
| 829 | case V_ASN1_UTCTIME:
|
---|
| 830 | case V_ASN1_GENERALIZEDTIME:
|
---|
| 831 | case V_ASN1_GRAPHICSTRING:
|
---|
| 832 | case V_ASN1_VISIBLESTRING:
|
---|
| 833 | case V_ASN1_GENERALSTRING:
|
---|
| 834 | case V_ASN1_UNIVERSALSTRING:
|
---|
| 835 | case V_ASN1_BMPSTRING:
|
---|
| 836 | case V_ASN1_UTF8STRING:
|
---|
| 837 | case V_ASN1_OTHER:
|
---|
| 838 | case V_ASN1_SET:
|
---|
| 839 | case V_ASN1_SEQUENCE:
|
---|
| 840 | default:
|
---|
| 841 | if (utype == V_ASN1_BMPSTRING && (len & 1)) {
|
---|
| 842 | ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
|
---|
| 843 | goto err;
|
---|
| 844 | }
|
---|
| 845 | if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
|
---|
| 846 | ASN1err(ASN1_F_ASN1_EX_C2I,
|
---|
| 847 | ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
|
---|
| 848 | goto err;
|
---|
| 849 | }
|
---|
| 850 | /* All based on ASN1_STRING and handled the same */
|
---|
| 851 | if (!*pval) {
|
---|
| 852 | stmp = ASN1_STRING_type_new(utype);
|
---|
| 853 | if (stmp == NULL) {
|
---|
| 854 | ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
|
---|
| 855 | goto err;
|
---|
| 856 | }
|
---|
| 857 | *pval = (ASN1_VALUE *)stmp;
|
---|
| 858 | } else {
|
---|
| 859 | stmp = (ASN1_STRING *)*pval;
|
---|
| 860 | stmp->type = utype;
|
---|
| 861 | }
|
---|
| 862 | /* If we've already allocated a buffer use it */
|
---|
| 863 | if (*free_cont) {
|
---|
| 864 | OPENSSL_free(stmp->data);
|
---|
| 865 | stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
|
---|
| 866 | stmp->length = len;
|
---|
| 867 | *free_cont = 0;
|
---|
| 868 | } else {
|
---|
| 869 | if (!ASN1_STRING_set(stmp, cont, len)) {
|
---|
| 870 | ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
|
---|
| 871 | ASN1_STRING_free(stmp);
|
---|
| 872 | *pval = NULL;
|
---|
| 873 | goto err;
|
---|
| 874 | }
|
---|
| 875 | }
|
---|
| 876 | break;
|
---|
| 877 | }
|
---|
| 878 | /* If ASN1_ANY and NULL type fix up value */
|
---|
| 879 | if (typ && (utype == V_ASN1_NULL))
|
---|
| 880 | typ->value.ptr = NULL;
|
---|
| 881 |
|
---|
| 882 | ret = 1;
|
---|
| 883 | err:
|
---|
| 884 | if (!ret) {
|
---|
| 885 | ASN1_TYPE_free(typ);
|
---|
| 886 | if (opval)
|
---|
| 887 | *opval = NULL;
|
---|
| 888 | }
|
---|
| 889 | return ret;
|
---|
| 890 | }
|
---|
| 891 |
|
---|
| 892 | /*
|
---|
| 893 | * This function finds the end of an ASN1 structure when passed its maximum
|
---|
| 894 | * length, whether it is indefinite length and a pointer to the content. This
|
---|
| 895 | * is more efficient than calling asn1_collect because it does not recurse on
|
---|
| 896 | * each indefinite length header.
|
---|
| 897 | */
|
---|
| 898 |
|
---|
| 899 | static int asn1_find_end(const unsigned char **in, long len, char inf)
|
---|
| 900 | {
|
---|
| 901 | uint32_t expected_eoc;
|
---|
| 902 | long plen;
|
---|
| 903 | const unsigned char *p = *in, *q;
|
---|
| 904 | /* If not indefinite length constructed just add length */
|
---|
| 905 | if (inf == 0) {
|
---|
| 906 | *in += len;
|
---|
| 907 | return 1;
|
---|
| 908 | }
|
---|
| 909 | expected_eoc = 1;
|
---|
| 910 | /*
|
---|
| 911 | * Indefinite length constructed form. Find the end when enough EOCs are
|
---|
| 912 | * found. If more indefinite length constructed headers are encountered
|
---|
| 913 | * increment the expected eoc count otherwise just skip to the end of the
|
---|
| 914 | * data.
|
---|
| 915 | */
|
---|
| 916 | while (len > 0) {
|
---|
| 917 | if (asn1_check_eoc(&p, len)) {
|
---|
| 918 | expected_eoc--;
|
---|
| 919 | if (expected_eoc == 0)
|
---|
| 920 | break;
|
---|
| 921 | len -= 2;
|
---|
| 922 | continue;
|
---|
| 923 | }
|
---|
| 924 | q = p;
|
---|
| 925 | /* Just read in a header: only care about the length */
|
---|
| 926 | if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
|
---|
| 927 | -1, 0, 0, NULL)) {
|
---|
| 928 | ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 929 | return 0;
|
---|
| 930 | }
|
---|
| 931 | if (inf) {
|
---|
| 932 | if (expected_eoc == UINT32_MAX) {
|
---|
| 933 | ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 934 | return 0;
|
---|
| 935 | }
|
---|
| 936 | expected_eoc++;
|
---|
| 937 | } else {
|
---|
| 938 | p += plen;
|
---|
| 939 | }
|
---|
| 940 | len -= p - q;
|
---|
| 941 | }
|
---|
| 942 | if (expected_eoc) {
|
---|
| 943 | ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
|
---|
| 944 | return 0;
|
---|
| 945 | }
|
---|
| 946 | *in = p;
|
---|
| 947 | return 1;
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | /*
|
---|
| 951 | * This function collects the asn1 data from a constructed string type into
|
---|
| 952 | * a buffer. The values of 'in' and 'len' should refer to the contents of the
|
---|
| 953 | * constructed type and 'inf' should be set if it is indefinite length.
|
---|
| 954 | */
|
---|
| 955 |
|
---|
| 956 | #ifndef ASN1_MAX_STRING_NEST
|
---|
| 957 | /*
|
---|
| 958 | * This determines how many levels of recursion are permitted in ASN1 string
|
---|
| 959 | * types. If it is not limited stack overflows can occur. If set to zero no
|
---|
| 960 | * recursion is allowed at all. Although zero should be adequate examples
|
---|
| 961 | * exist that require a value of 1. So 5 should be more than enough.
|
---|
| 962 | */
|
---|
| 963 | # define ASN1_MAX_STRING_NEST 5
|
---|
| 964 | #endif
|
---|
| 965 |
|
---|
| 966 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
|
---|
| 967 | char inf, int tag, int aclass, int depth)
|
---|
| 968 | {
|
---|
| 969 | const unsigned char *p, *q;
|
---|
| 970 | long plen;
|
---|
| 971 | char cst, ininf;
|
---|
| 972 | p = *in;
|
---|
| 973 | inf &= 1;
|
---|
| 974 | /*
|
---|
| 975 | * If no buffer and not indefinite length constructed just pass over the
|
---|
| 976 | * encoded data
|
---|
| 977 | */
|
---|
| 978 | if (!buf && !inf) {
|
---|
| 979 | *in += len;
|
---|
| 980 | return 1;
|
---|
| 981 | }
|
---|
| 982 | while (len > 0) {
|
---|
| 983 | q = p;
|
---|
| 984 | /* Check for EOC */
|
---|
| 985 | if (asn1_check_eoc(&p, len)) {
|
---|
| 986 | /*
|
---|
| 987 | * EOC is illegal outside indefinite length constructed form
|
---|
| 988 | */
|
---|
| 989 | if (!inf) {
|
---|
| 990 | ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
|
---|
| 991 | return 0;
|
---|
| 992 | }
|
---|
| 993 | inf = 0;
|
---|
| 994 | break;
|
---|
| 995 | }
|
---|
| 996 |
|
---|
| 997 | if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
|
---|
| 998 | len, tag, aclass, 0, NULL)) {
|
---|
| 999 | ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
|
---|
| 1000 | return 0;
|
---|
| 1001 | }
|
---|
| 1002 |
|
---|
| 1003 | /* If indefinite length constructed update max length */
|
---|
| 1004 | if (cst) {
|
---|
| 1005 | if (depth >= ASN1_MAX_STRING_NEST) {
|
---|
| 1006 | ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
|
---|
| 1007 | return 0;
|
---|
| 1008 | }
|
---|
| 1009 | if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
|
---|
| 1010 | return 0;
|
---|
| 1011 | } else if (plen && !collect_data(buf, &p, plen))
|
---|
| 1012 | return 0;
|
---|
| 1013 | len -= p - q;
|
---|
| 1014 | }
|
---|
| 1015 | if (inf) {
|
---|
| 1016 | ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
|
---|
| 1017 | return 0;
|
---|
| 1018 | }
|
---|
| 1019 | *in = p;
|
---|
| 1020 | return 1;
|
---|
| 1021 | }
|
---|
| 1022 |
|
---|
| 1023 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
|
---|
| 1024 | {
|
---|
| 1025 | int len;
|
---|
| 1026 | if (buf) {
|
---|
| 1027 | len = buf->length;
|
---|
| 1028 | if (!BUF_MEM_grow_clean(buf, len + plen)) {
|
---|
| 1029 | ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
|
---|
| 1030 | return 0;
|
---|
| 1031 | }
|
---|
| 1032 | memcpy(buf->data + len, *p, plen);
|
---|
| 1033 | }
|
---|
| 1034 | *p += plen;
|
---|
| 1035 | return 1;
|
---|
| 1036 | }
|
---|
| 1037 |
|
---|
| 1038 | /* Check for ASN1 EOC and swallow it if found */
|
---|
| 1039 |
|
---|
| 1040 | static int asn1_check_eoc(const unsigned char **in, long len)
|
---|
| 1041 | {
|
---|
| 1042 | const unsigned char *p;
|
---|
| 1043 | if (len < 2)
|
---|
| 1044 | return 0;
|
---|
| 1045 | p = *in;
|
---|
| 1046 | if (!p[0] && !p[1]) {
|
---|
| 1047 | *in += 2;
|
---|
| 1048 | return 1;
|
---|
| 1049 | }
|
---|
| 1050 | return 0;
|
---|
| 1051 | }
|
---|
| 1052 |
|
---|
| 1053 | /*
|
---|
| 1054 | * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
|
---|
| 1055 | * length for indefinite length constructed form, we don't know the exact
|
---|
| 1056 | * length but we can set an upper bound to the amount of data available minus
|
---|
| 1057 | * the header length just read.
|
---|
| 1058 | */
|
---|
| 1059 |
|
---|
| 1060 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
|
---|
| 1061 | char *inf, char *cst,
|
---|
| 1062 | const unsigned char **in, long len,
|
---|
| 1063 | int exptag, int expclass, char opt, ASN1_TLC *ctx)
|
---|
| 1064 | {
|
---|
| 1065 | int i;
|
---|
| 1066 | int ptag, pclass;
|
---|
| 1067 | long plen;
|
---|
| 1068 | const unsigned char *p, *q;
|
---|
| 1069 | p = *in;
|
---|
| 1070 | q = p;
|
---|
| 1071 |
|
---|
| 1072 | if (ctx && ctx->valid) {
|
---|
| 1073 | i = ctx->ret;
|
---|
| 1074 | plen = ctx->plen;
|
---|
| 1075 | pclass = ctx->pclass;
|
---|
| 1076 | ptag = ctx->ptag;
|
---|
| 1077 | p += ctx->hdrlen;
|
---|
| 1078 | } else {
|
---|
| 1079 | i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
|
---|
| 1080 | if (ctx) {
|
---|
| 1081 | ctx->ret = i;
|
---|
| 1082 | ctx->plen = plen;
|
---|
| 1083 | ctx->pclass = pclass;
|
---|
| 1084 | ctx->ptag = ptag;
|
---|
| 1085 | ctx->hdrlen = p - q;
|
---|
| 1086 | ctx->valid = 1;
|
---|
| 1087 | /*
|
---|
| 1088 | * If definite length, and no error, length + header can't exceed
|
---|
| 1089 | * total amount of data available.
|
---|
| 1090 | */
|
---|
| 1091 | if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
|
---|
| 1092 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
|
---|
| 1093 | asn1_tlc_clear(ctx);
|
---|
| 1094 | return 0;
|
---|
| 1095 | }
|
---|
| 1096 | }
|
---|
| 1097 | }
|
---|
| 1098 |
|
---|
| 1099 | if (i & 0x80) {
|
---|
| 1100 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
|
---|
| 1101 | asn1_tlc_clear(ctx);
|
---|
| 1102 | return 0;
|
---|
| 1103 | }
|
---|
| 1104 | if (exptag >= 0) {
|
---|
| 1105 | if ((exptag != ptag) || (expclass != pclass)) {
|
---|
| 1106 | /*
|
---|
| 1107 | * If type is OPTIONAL, not an error: indicate missing type.
|
---|
| 1108 | */
|
---|
| 1109 | if (opt)
|
---|
| 1110 | return -1;
|
---|
| 1111 | asn1_tlc_clear(ctx);
|
---|
| 1112 | ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
|
---|
| 1113 | return 0;
|
---|
| 1114 | }
|
---|
| 1115 | /*
|
---|
| 1116 | * We have a tag and class match: assume we are going to do something
|
---|
| 1117 | * with it
|
---|
| 1118 | */
|
---|
| 1119 | asn1_tlc_clear(ctx);
|
---|
| 1120 | }
|
---|
| 1121 |
|
---|
| 1122 | if (i & 1)
|
---|
| 1123 | plen = len - (p - q);
|
---|
| 1124 |
|
---|
| 1125 | if (inf)
|
---|
| 1126 | *inf = i & 1;
|
---|
| 1127 |
|
---|
| 1128 | if (cst)
|
---|
| 1129 | *cst = i & V_ASN1_CONSTRUCTED;
|
---|
| 1130 |
|
---|
| 1131 | if (olen)
|
---|
| 1132 | *olen = plen;
|
---|
| 1133 |
|
---|
| 1134 | if (oclass)
|
---|
| 1135 | *oclass = pclass;
|
---|
| 1136 |
|
---|
| 1137 | if (otag)
|
---|
| 1138 | *otag = ptag;
|
---|
| 1139 |
|
---|
| 1140 | *in = p;
|
---|
| 1141 | return 1;
|
---|
| 1142 | }
|
---|