1109998Smarkm/* tasn_dec.c */ 2296341Sdelphij/* 3296341Sdelphij * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4296341Sdelphij * 2000. 5109998Smarkm */ 6109998Smarkm/* ==================================================================== 7160814Ssimon * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. 8109998Smarkm * 9109998Smarkm * Redistribution and use in source and binary forms, with or without 10109998Smarkm * modification, are permitted provided that the following conditions 11109998Smarkm * are met: 12109998Smarkm * 13109998Smarkm * 1. Redistributions of source code must retain the above copyright 14296341Sdelphij * notice, this list of conditions and the following disclaimer. 15109998Smarkm * 16109998Smarkm * 2. Redistributions in binary form must reproduce the above copyright 17109998Smarkm * notice, this list of conditions and the following disclaimer in 18109998Smarkm * the documentation and/or other materials provided with the 19109998Smarkm * distribution. 20109998Smarkm * 21109998Smarkm * 3. All advertising materials mentioning features or use of this 22109998Smarkm * software must display the following acknowledgment: 23109998Smarkm * "This product includes software developed by the OpenSSL Project 24109998Smarkm * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25109998Smarkm * 26109998Smarkm * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27109998Smarkm * endorse or promote products derived from this software without 28109998Smarkm * prior written permission. For written permission, please contact 29109998Smarkm * licensing@OpenSSL.org. 30109998Smarkm * 31109998Smarkm * 5. Products derived from this software may not be called "OpenSSL" 32109998Smarkm * nor may "OpenSSL" appear in their names without prior written 33109998Smarkm * permission of the OpenSSL Project. 34109998Smarkm * 35109998Smarkm * 6. Redistributions of any form whatsoever must retain the following 36109998Smarkm * acknowledgment: 37109998Smarkm * "This product includes software developed by the OpenSSL Project 38109998Smarkm * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39109998Smarkm * 40109998Smarkm * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41109998Smarkm * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42109998Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43109998Smarkm * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44109998Smarkm * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45109998Smarkm * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46109998Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47109998Smarkm * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48109998Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49109998Smarkm * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50109998Smarkm * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51109998Smarkm * OF THE POSSIBILITY OF SUCH DAMAGE. 52109998Smarkm * ==================================================================== 53109998Smarkm * 54109998Smarkm * This product includes cryptographic software written by Eric Young 55109998Smarkm * (eay@cryptsoft.com). This product includes software written by Tim 56109998Smarkm * Hudson (tjh@cryptsoft.com). 57109998Smarkm * 58109998Smarkm */ 59109998Smarkm 60109998Smarkm#include <stddef.h> 61109998Smarkm#include <string.h> 62109998Smarkm#include <openssl/asn1.h> 63109998Smarkm#include <openssl/asn1t.h> 64109998Smarkm#include <openssl/objects.h> 65109998Smarkm#include <openssl/buffer.h> 66109998Smarkm#include <openssl/err.h> 67109998Smarkm 68160814Ssimonstatic int asn1_check_eoc(const unsigned char **in, long len); 69160814Ssimonstatic int asn1_find_end(const unsigned char **in, long len, char inf); 70109998Smarkm 71160814Ssimonstatic int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, 72296341Sdelphij char inf, int tag, int aclass, int depth); 73160814Ssimon 74160814Ssimonstatic int collect_data(BUF_MEM *buf, const unsigned char **p, long plen); 75160814Ssimon 76160814Ssimonstatic int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, 77296341Sdelphij char *inf, char *cst, 78296341Sdelphij const unsigned char **in, long len, 79296341Sdelphij int exptag, int expclass, char opt, ASN1_TLC *ctx); 80160814Ssimon 81160814Ssimonstatic int asn1_template_ex_d2i(ASN1_VALUE **pval, 82296341Sdelphij const unsigned char **in, long len, 83296341Sdelphij const ASN1_TEMPLATE *tt, char opt, 84296341Sdelphij ASN1_TLC *ctx); 85160814Ssimonstatic int asn1_template_noexp_d2i(ASN1_VALUE **val, 86296341Sdelphij const unsigned char **in, long len, 87296341Sdelphij const ASN1_TEMPLATE *tt, char opt, 88296341Sdelphij ASN1_TLC *ctx); 89160814Ssimonstatic int asn1_d2i_ex_primitive(ASN1_VALUE **pval, 90296341Sdelphij const unsigned char **in, long len, 91296341Sdelphij const ASN1_ITEM *it, 92296341Sdelphij int tag, int aclass, char opt, 93296341Sdelphij ASN1_TLC *ctx); 94160814Ssimon 95109998Smarkm/* Table to convert tags to bit values, used for MSTRING type */ 96167612Ssimonstatic const unsigned long tag2bit[32] = { 97296341Sdelphij /* tags 0 - 3 */ 98296341Sdelphij 0, 0, 0, B_ASN1_BIT_STRING, 99296341Sdelphij /* tags 4- 7 */ 100296341Sdelphij B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN, 101296341Sdelphij /* tags 8-11 */ 102296341Sdelphij B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, 103296341Sdelphij /* tags 12-15 */ 104296341Sdelphij B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, 105296341Sdelphij /* tags 16-19 */ 106296341Sdelphij B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING, 107296341Sdelphij /* tags 20-22 */ 108296341Sdelphij B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING, 109296341Sdelphij /* tags 23-24 */ 110296341Sdelphij B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, 111296341Sdelphij /* tags 25-27 */ 112296341Sdelphij B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING, 113296341Sdelphij /* tags 28-31 */ 114296341Sdelphij B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN, 115296341Sdelphij}; 116109998Smarkm 117109998Smarkmunsigned long ASN1_tag2bit(int tag) 118296341Sdelphij{ 119296341Sdelphij if ((tag < 0) || (tag > 30)) 120296341Sdelphij return 0; 121296341Sdelphij return tag2bit[tag]; 122296341Sdelphij} 123109998Smarkm 124109998Smarkm/* Macro to initialize and invalidate the cache */ 125109998Smarkm 126296341Sdelphij#define asn1_tlc_clear(c) if (c) (c)->valid = 0 127238405Sjkim/* Version to avoid compiler warning about 'c' always non-NULL */ 128296341Sdelphij#define asn1_tlc_clear_nc(c) (c)->valid = 0 129109998Smarkm 130296341Sdelphij/* 131296341Sdelphij * Decode an ASN1 item, this currently behaves just like a standard 'd2i' 132296341Sdelphij * function. 'in' points to a buffer to read the data from, in future we 133296341Sdelphij * will have more advanced versions that can input data a piece at a time and 134296341Sdelphij * this will simply be a special case. 135109998Smarkm */ 136109998Smarkm 137160814SsimonASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, 138296341Sdelphij const unsigned char **in, long len, 139296341Sdelphij const ASN1_ITEM *it) 140296341Sdelphij{ 141296341Sdelphij ASN1_TLC c; 142296341Sdelphij ASN1_VALUE *ptmpval = NULL; 143296341Sdelphij if (!pval) 144296341Sdelphij pval = &ptmpval; 145296341Sdelphij asn1_tlc_clear_nc(&c); 146296341Sdelphij if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) 147296341Sdelphij return *pval; 148296341Sdelphij return NULL; 149296341Sdelphij} 150109998Smarkm 151160814Ssimonint ASN1_template_d2i(ASN1_VALUE **pval, 152296341Sdelphij const unsigned char **in, long len, 153296341Sdelphij const ASN1_TEMPLATE *tt) 154296341Sdelphij{ 155296341Sdelphij ASN1_TLC c; 156296341Sdelphij asn1_tlc_clear_nc(&c); 157296341Sdelphij return asn1_template_ex_d2i(pval, in, len, tt, 0, &c); 158296341Sdelphij} 159109998Smarkm 160296341Sdelphij/* 161296341Sdelphij * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and 162296341Sdelphij * tag mismatch return -1 to handle OPTIONAL 163109998Smarkm */ 164109998Smarkm 165160814Ssimonint ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, 166296341Sdelphij const ASN1_ITEM *it, 167296341Sdelphij int tag, int aclass, char opt, ASN1_TLC *ctx) 168296341Sdelphij{ 169296341Sdelphij const ASN1_TEMPLATE *tt, *errtt = NULL; 170296341Sdelphij const ASN1_COMPAT_FUNCS *cf; 171296341Sdelphij const ASN1_EXTERN_FUNCS *ef; 172296341Sdelphij const ASN1_AUX *aux = it->funcs; 173296341Sdelphij ASN1_aux_cb *asn1_cb; 174296341Sdelphij const unsigned char *p = NULL, *q; 175296341Sdelphij unsigned char *wp = NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */ 176296341Sdelphij unsigned char imphack = 0, oclass; 177296341Sdelphij char seq_eoc, seq_nolen, cst, isopt; 178296341Sdelphij long tmplen; 179296341Sdelphij int i; 180296341Sdelphij int otag; 181296341Sdelphij int ret = 0; 182296341Sdelphij ASN1_VALUE **pchptr, *ptmpval; 183296341Sdelphij int combine = aclass & ASN1_TFLG_COMBINE; 184296341Sdelphij aclass &= ~ASN1_TFLG_COMBINE; 185296341Sdelphij if (!pval) 186296341Sdelphij return 0; 187296341Sdelphij if (aux && aux->asn1_cb) 188296341Sdelphij asn1_cb = aux->asn1_cb; 189296341Sdelphij else 190296341Sdelphij asn1_cb = 0; 191109998Smarkm 192296341Sdelphij switch (it->itype) { 193296341Sdelphij case ASN1_ITYPE_PRIMITIVE: 194296341Sdelphij if (it->templates) { 195296341Sdelphij /* 196296341Sdelphij * tagging or OPTIONAL is currently illegal on an item template 197296341Sdelphij * because the flags can't get passed down. In practice this 198296341Sdelphij * isn't a problem: we include the relevant flags from the item 199296341Sdelphij * template in the template itself. 200296341Sdelphij */ 201296341Sdelphij if ((tag != -1) || opt) { 202296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, 203296341Sdelphij ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE); 204296341Sdelphij goto err; 205296341Sdelphij } 206296341Sdelphij return asn1_template_ex_d2i(pval, in, len, 207296341Sdelphij it->templates, opt, ctx); 208296341Sdelphij } 209296341Sdelphij return asn1_d2i_ex_primitive(pval, in, len, it, 210296341Sdelphij tag, aclass, opt, ctx); 211296341Sdelphij break; 212109998Smarkm 213296341Sdelphij case ASN1_ITYPE_MSTRING: 214296341Sdelphij p = *in; 215296341Sdelphij /* Just read in tag and class */ 216296341Sdelphij ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, 217296341Sdelphij &p, len, -1, 0, 1, ctx); 218296341Sdelphij if (!ret) { 219296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 220296341Sdelphij goto err; 221296341Sdelphij } 222160814Ssimon 223296341Sdelphij /* Must be UNIVERSAL class */ 224296341Sdelphij if (oclass != V_ASN1_UNIVERSAL) { 225296341Sdelphij /* If OPTIONAL, assume this is OK */ 226296341Sdelphij if (opt) 227296341Sdelphij return -1; 228296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL); 229296341Sdelphij goto err; 230296341Sdelphij } 231296341Sdelphij /* Check tag matches bit map */ 232296341Sdelphij if (!(ASN1_tag2bit(otag) & it->utype)) { 233296341Sdelphij /* If OPTIONAL, assume this is OK */ 234296341Sdelphij if (opt) 235296341Sdelphij return -1; 236296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG); 237296341Sdelphij goto err; 238296341Sdelphij } 239296341Sdelphij return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx); 240109998Smarkm 241296341Sdelphij case ASN1_ITYPE_EXTERN: 242296341Sdelphij /* Use new style d2i */ 243296341Sdelphij ef = it->funcs; 244296341Sdelphij return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx); 245109998Smarkm 246296341Sdelphij case ASN1_ITYPE_COMPAT: 247296341Sdelphij /* we must resort to old style evil hackery */ 248296341Sdelphij cf = it->funcs; 249109998Smarkm 250296341Sdelphij /* If OPTIONAL see if it is there */ 251296341Sdelphij if (opt) { 252296341Sdelphij int exptag; 253296341Sdelphij p = *in; 254296341Sdelphij if (tag == -1) 255296341Sdelphij exptag = it->utype; 256296341Sdelphij else 257296341Sdelphij exptag = tag; 258296341Sdelphij /* 259296341Sdelphij * Don't care about anything other than presence of expected tag 260296341Sdelphij */ 261160814Ssimon 262296341Sdelphij ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, 263296341Sdelphij &p, len, exptag, aclass, 1, ctx); 264296341Sdelphij if (!ret) { 265296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 266296341Sdelphij goto err; 267296341Sdelphij } 268296341Sdelphij if (ret == -1) 269296341Sdelphij return -1; 270296341Sdelphij } 271160814Ssimon 272296341Sdelphij /* 273296341Sdelphij * This is the old style evil hack IMPLICIT handling: since the 274296341Sdelphij * underlying code is expecting a tag and class other than the one 275296341Sdelphij * present we change the buffer temporarily then change it back 276296341Sdelphij * afterwards. This doesn't and never did work for tags > 30. Yes 277296341Sdelphij * this is *horrible* but it is only needed for old style d2i which 278296341Sdelphij * will hopefully not be around for much longer. FIXME: should copy 279296341Sdelphij * the buffer then modify it so the input buffer can be const: we 280296341Sdelphij * should *always* copy because the old style d2i might modify the 281296341Sdelphij * buffer. 282296341Sdelphij */ 283109998Smarkm 284296341Sdelphij if (tag != -1) { 285296341Sdelphij wp = *(unsigned char **)in; 286296341Sdelphij imphack = *wp; 287296341Sdelphij if (p == NULL) { 288296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 289296341Sdelphij goto err; 290296341Sdelphij } 291296341Sdelphij *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED) 292296341Sdelphij | it->utype); 293296341Sdelphij } 294109998Smarkm 295296341Sdelphij ptmpval = cf->asn1_d2i(pval, in, len); 296109998Smarkm 297296341Sdelphij if (tag != -1) 298296341Sdelphij *wp = imphack; 299109998Smarkm 300296341Sdelphij if (ptmpval) 301296341Sdelphij return 1; 302160814Ssimon 303296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 304296341Sdelphij goto err; 305109998Smarkm 306296341Sdelphij case ASN1_ITYPE_CHOICE: 307296341Sdelphij if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) 308296341Sdelphij goto auxerr; 309296341Sdelphij if (*pval) { 310296341Sdelphij /* Free up and zero CHOICE value if initialised */ 311296341Sdelphij i = asn1_get_choice_selector(pval, it); 312296341Sdelphij if ((i >= 0) && (i < it->tcount)) { 313296341Sdelphij tt = it->templates + i; 314296341Sdelphij pchptr = asn1_get_field_ptr(pval, tt); 315296341Sdelphij ASN1_template_free(pchptr, tt); 316296341Sdelphij asn1_set_choice_selector(pval, -1, it); 317296341Sdelphij } 318296341Sdelphij } else if (!ASN1_item_ex_new(pval, it)) { 319296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 320296341Sdelphij goto err; 321296341Sdelphij } 322296341Sdelphij /* CHOICE type, try each possibility in turn */ 323296341Sdelphij p = *in; 324296341Sdelphij for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { 325296341Sdelphij pchptr = asn1_get_field_ptr(pval, tt); 326296341Sdelphij /* 327296341Sdelphij * We mark field as OPTIONAL so its absence can be recognised. 328296341Sdelphij */ 329296341Sdelphij ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx); 330296341Sdelphij /* If field not present, try the next one */ 331296341Sdelphij if (ret == -1) 332296341Sdelphij continue; 333296341Sdelphij /* If positive return, read OK, break loop */ 334296341Sdelphij if (ret > 0) 335296341Sdelphij break; 336296341Sdelphij /* Otherwise must be an ASN1 parsing error */ 337296341Sdelphij errtt = tt; 338296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 339296341Sdelphij goto err; 340296341Sdelphij } 341109998Smarkm 342296341Sdelphij /* Did we fall off the end without reading anything? */ 343296341Sdelphij if (i == it->tcount) { 344296341Sdelphij /* If OPTIONAL, this is OK */ 345296341Sdelphij if (opt) { 346296341Sdelphij /* Free and zero it */ 347296341Sdelphij ASN1_item_ex_free(pval, it); 348296341Sdelphij return -1; 349296341Sdelphij } 350296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE); 351296341Sdelphij goto err; 352296341Sdelphij } 353109998Smarkm 354296341Sdelphij asn1_set_choice_selector(pval, i, it); 355296341Sdelphij *in = p; 356296341Sdelphij if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) 357296341Sdelphij goto auxerr; 358296341Sdelphij return 1; 359160814Ssimon 360296341Sdelphij case ASN1_ITYPE_NDEF_SEQUENCE: 361296341Sdelphij case ASN1_ITYPE_SEQUENCE: 362296341Sdelphij p = *in; 363296341Sdelphij tmplen = len; 364160814Ssimon 365296341Sdelphij /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ 366296341Sdelphij if (tag == -1) { 367296341Sdelphij tag = V_ASN1_SEQUENCE; 368296341Sdelphij aclass = V_ASN1_UNIVERSAL; 369296341Sdelphij } 370296341Sdelphij /* Get SEQUENCE length and update len, p */ 371296341Sdelphij ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, 372296341Sdelphij &p, len, tag, aclass, opt, ctx); 373296341Sdelphij if (!ret) { 374296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 375296341Sdelphij goto err; 376296341Sdelphij } else if (ret == -1) 377296341Sdelphij return -1; 378296341Sdelphij if (aux && (aux->flags & ASN1_AFLG_BROKEN)) { 379296341Sdelphij len = tmplen - (p - *in); 380296341Sdelphij seq_nolen = 1; 381296341Sdelphij } 382296341Sdelphij /* If indefinite we don't do a length check */ 383296341Sdelphij else 384296341Sdelphij seq_nolen = seq_eoc; 385296341Sdelphij if (!cst) { 386296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED); 387296341Sdelphij goto err; 388296341Sdelphij } 389109998Smarkm 390296341Sdelphij if (!*pval && !ASN1_item_ex_new(pval, it)) { 391296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 392296341Sdelphij goto err; 393296341Sdelphij } 394109998Smarkm 395296341Sdelphij if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) 396296341Sdelphij goto auxerr; 397109998Smarkm 398296341Sdelphij /* Free up and zero any ADB found */ 399296341Sdelphij for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { 400296341Sdelphij if (tt->flags & ASN1_TFLG_ADB_MASK) { 401296341Sdelphij const ASN1_TEMPLATE *seqtt; 402296341Sdelphij ASN1_VALUE **pseqval; 403296341Sdelphij seqtt = asn1_do_adb(pval, tt, 1); 404296341Sdelphij pseqval = asn1_get_field_ptr(pval, seqtt); 405296341Sdelphij ASN1_template_free(pseqval, seqtt); 406296341Sdelphij } 407296341Sdelphij } 408160814Ssimon 409296341Sdelphij /* Get each field entry */ 410296341Sdelphij for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { 411296341Sdelphij const ASN1_TEMPLATE *seqtt; 412296341Sdelphij ASN1_VALUE **pseqval; 413296341Sdelphij seqtt = asn1_do_adb(pval, tt, 1); 414296341Sdelphij if (!seqtt) 415296341Sdelphij goto err; 416296341Sdelphij pseqval = asn1_get_field_ptr(pval, seqtt); 417296341Sdelphij /* Have we ran out of data? */ 418296341Sdelphij if (!len) 419296341Sdelphij break; 420296341Sdelphij q = p; 421296341Sdelphij if (asn1_check_eoc(&p, len)) { 422296341Sdelphij if (!seq_eoc) { 423296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC); 424296341Sdelphij goto err; 425296341Sdelphij } 426296341Sdelphij len -= p - q; 427296341Sdelphij seq_eoc = 0; 428296341Sdelphij q = p; 429296341Sdelphij break; 430296341Sdelphij } 431296341Sdelphij /* 432296341Sdelphij * This determines the OPTIONAL flag value. The field cannot be 433296341Sdelphij * omitted if it is the last of a SEQUENCE and there is still 434296341Sdelphij * data to be read. This isn't strictly necessary but it 435296341Sdelphij * increases efficiency in some cases. 436296341Sdelphij */ 437296341Sdelphij if (i == (it->tcount - 1)) 438296341Sdelphij isopt = 0; 439296341Sdelphij else 440296341Sdelphij isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL); 441296341Sdelphij /* 442296341Sdelphij * attempt to read in field, allowing each to be OPTIONAL 443296341Sdelphij */ 444109998Smarkm 445296341Sdelphij ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx); 446296341Sdelphij if (!ret) { 447296341Sdelphij errtt = seqtt; 448296341Sdelphij goto err; 449296341Sdelphij } else if (ret == -1) { 450296341Sdelphij /* 451296341Sdelphij * OPTIONAL component absent. Free and zero the field. 452296341Sdelphij */ 453296341Sdelphij ASN1_template_free(pseqval, seqtt); 454296341Sdelphij continue; 455296341Sdelphij } 456296341Sdelphij /* Update length */ 457296341Sdelphij len -= p - q; 458296341Sdelphij } 459280268Sdelphij 460296341Sdelphij /* Check for EOC if expecting one */ 461296341Sdelphij if (seq_eoc && !asn1_check_eoc(&p, len)) { 462296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC); 463296341Sdelphij goto err; 464296341Sdelphij } 465296341Sdelphij /* Check all data read */ 466296341Sdelphij if (!seq_nolen && len) { 467296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH); 468296341Sdelphij goto err; 469296341Sdelphij } 470160814Ssimon 471296341Sdelphij /* 472296341Sdelphij * If we get here we've got no more data in the SEQUENCE, however we 473296341Sdelphij * may not have read all fields so check all remaining are OPTIONAL 474296341Sdelphij * and clear any that are. 475296341Sdelphij */ 476296341Sdelphij for (; i < it->tcount; tt++, i++) { 477296341Sdelphij const ASN1_TEMPLATE *seqtt; 478296341Sdelphij seqtt = asn1_do_adb(pval, tt, 1); 479296341Sdelphij if (!seqtt) 480296341Sdelphij goto err; 481296341Sdelphij if (seqtt->flags & ASN1_TFLG_OPTIONAL) { 482296341Sdelphij ASN1_VALUE **pseqval; 483296341Sdelphij pseqval = asn1_get_field_ptr(pval, seqtt); 484296341Sdelphij ASN1_template_free(pseqval, seqtt); 485296341Sdelphij } else { 486296341Sdelphij errtt = seqtt; 487296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING); 488296341Sdelphij goto err; 489296341Sdelphij } 490296341Sdelphij } 491296341Sdelphij /* Save encoding */ 492296341Sdelphij if (!asn1_enc_save(pval, *in, p - *in, it)) 493296341Sdelphij goto auxerr; 494296341Sdelphij *in = p; 495296341Sdelphij if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) 496296341Sdelphij goto auxerr; 497296341Sdelphij return 1; 498160814Ssimon 499296341Sdelphij default: 500296341Sdelphij return 0; 501296341Sdelphij } 502296341Sdelphij auxerr: 503296341Sdelphij ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR); 504296341Sdelphij err: 505296341Sdelphij if (combine == 0) 506296341Sdelphij ASN1_item_ex_free(pval, it); 507296341Sdelphij if (errtt) 508296341Sdelphij ERR_add_error_data(4, "Field=", errtt->field_name, 509296341Sdelphij ", Type=", it->sname); 510296341Sdelphij else 511296341Sdelphij ERR_add_error_data(2, "Type=", it->sname); 512296341Sdelphij return 0; 513296341Sdelphij} 514109998Smarkm 515296341Sdelphij/* 516296341Sdelphij * Templates are handled with two separate functions. One handles any 517296341Sdelphij * EXPLICIT tag and the other handles the rest. 518109998Smarkm */ 519109998Smarkm 520160814Ssimonstatic int asn1_template_ex_d2i(ASN1_VALUE **val, 521296341Sdelphij const unsigned char **in, long inlen, 522296341Sdelphij const ASN1_TEMPLATE *tt, char opt, 523296341Sdelphij ASN1_TLC *ctx) 524296341Sdelphij{ 525296341Sdelphij int flags, aclass; 526296341Sdelphij int ret; 527296341Sdelphij long len; 528296341Sdelphij const unsigned char *p, *q; 529296341Sdelphij char exp_eoc; 530296341Sdelphij if (!val) 531296341Sdelphij return 0; 532296341Sdelphij flags = tt->flags; 533296341Sdelphij aclass = flags & ASN1_TFLG_TAG_CLASS; 534109998Smarkm 535296341Sdelphij p = *in; 536109998Smarkm 537296341Sdelphij /* Check if EXPLICIT tag expected */ 538296341Sdelphij if (flags & ASN1_TFLG_EXPTAG) { 539296341Sdelphij char cst; 540296341Sdelphij /* 541296341Sdelphij * Need to work out amount of data available to the inner content and 542296341Sdelphij * where it starts: so read in EXPLICIT header to get the info. 543296341Sdelphij */ 544296341Sdelphij ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, 545296341Sdelphij &p, inlen, tt->tag, aclass, opt, ctx); 546296341Sdelphij q = p; 547296341Sdelphij if (!ret) { 548296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 549296341Sdelphij return 0; 550296341Sdelphij } else if (ret == -1) 551296341Sdelphij return -1; 552296341Sdelphij if (!cst) { 553296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, 554296341Sdelphij ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED); 555296341Sdelphij return 0; 556296341Sdelphij } 557296341Sdelphij /* We've found the field so it can't be OPTIONAL now */ 558296341Sdelphij ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx); 559296341Sdelphij if (!ret) { 560296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR); 561296341Sdelphij return 0; 562296341Sdelphij } 563296341Sdelphij /* We read the field in OK so update length */ 564296341Sdelphij len -= p - q; 565296341Sdelphij if (exp_eoc) { 566296341Sdelphij /* If NDEF we must have an EOC here */ 567296341Sdelphij if (!asn1_check_eoc(&p, len)) { 568296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC); 569296341Sdelphij goto err; 570296341Sdelphij } 571296341Sdelphij } else { 572296341Sdelphij /* 573296341Sdelphij * Otherwise we must hit the EXPLICIT tag end or its an error 574296341Sdelphij */ 575296341Sdelphij if (len) { 576296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, 577296341Sdelphij ASN1_R_EXPLICIT_LENGTH_MISMATCH); 578296341Sdelphij goto err; 579296341Sdelphij } 580296341Sdelphij } 581296341Sdelphij } else 582296341Sdelphij return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx); 583109998Smarkm 584296341Sdelphij *in = p; 585296341Sdelphij return 1; 586109998Smarkm 587296341Sdelphij err: 588296341Sdelphij ASN1_template_free(val, tt); 589296341Sdelphij return 0; 590296341Sdelphij} 591109998Smarkm 592160814Ssimonstatic int asn1_template_noexp_d2i(ASN1_VALUE **val, 593296341Sdelphij const unsigned char **in, long len, 594296341Sdelphij const ASN1_TEMPLATE *tt, char opt, 595296341Sdelphij ASN1_TLC *ctx) 596296341Sdelphij{ 597296341Sdelphij int flags, aclass; 598296341Sdelphij int ret; 599296341Sdelphij const unsigned char *p, *q; 600296341Sdelphij if (!val) 601296341Sdelphij return 0; 602296341Sdelphij flags = tt->flags; 603296341Sdelphij aclass = flags & ASN1_TFLG_TAG_CLASS; 604109998Smarkm 605296341Sdelphij p = *in; 606296341Sdelphij q = p; 607109998Smarkm 608296341Sdelphij if (flags & ASN1_TFLG_SK_MASK) { 609296341Sdelphij /* SET OF, SEQUENCE OF */ 610296341Sdelphij int sktag, skaclass; 611296341Sdelphij char sk_eoc; 612296341Sdelphij /* First work out expected inner tag value */ 613296341Sdelphij if (flags & ASN1_TFLG_IMPTAG) { 614296341Sdelphij sktag = tt->tag; 615296341Sdelphij skaclass = aclass; 616296341Sdelphij } else { 617296341Sdelphij skaclass = V_ASN1_UNIVERSAL; 618296341Sdelphij if (flags & ASN1_TFLG_SET_OF) 619296341Sdelphij sktag = V_ASN1_SET; 620296341Sdelphij else 621296341Sdelphij sktag = V_ASN1_SEQUENCE; 622296341Sdelphij } 623296341Sdelphij /* Get the tag */ 624296341Sdelphij ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, 625296341Sdelphij &p, len, sktag, skaclass, opt, ctx); 626296341Sdelphij if (!ret) { 627296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); 628296341Sdelphij return 0; 629296341Sdelphij } else if (ret == -1) 630296341Sdelphij return -1; 631296341Sdelphij if (!*val) 632296341Sdelphij *val = (ASN1_VALUE *)sk_new_null(); 633296341Sdelphij else { 634296341Sdelphij /* 635296341Sdelphij * We've got a valid STACK: free up any items present 636296341Sdelphij */ 637296341Sdelphij STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val; 638296341Sdelphij ASN1_VALUE *vtmp; 639296341Sdelphij while (sk_ASN1_VALUE_num(sktmp) > 0) { 640296341Sdelphij vtmp = sk_ASN1_VALUE_pop(sktmp); 641296341Sdelphij ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item)); 642296341Sdelphij } 643296341Sdelphij } 644160814Ssimon 645296341Sdelphij if (!*val) { 646296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE); 647296341Sdelphij goto err; 648296341Sdelphij } 649109998Smarkm 650296341Sdelphij /* Read as many items as we can */ 651296341Sdelphij while (len > 0) { 652296341Sdelphij ASN1_VALUE *skfield; 653296341Sdelphij q = p; 654296341Sdelphij /* See if EOC found */ 655296341Sdelphij if (asn1_check_eoc(&p, len)) { 656296341Sdelphij if (!sk_eoc) { 657296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, 658296341Sdelphij ASN1_R_UNEXPECTED_EOC); 659296341Sdelphij goto err; 660296341Sdelphij } 661296341Sdelphij len -= p - q; 662296341Sdelphij sk_eoc = 0; 663296341Sdelphij break; 664296341Sdelphij } 665296341Sdelphij skfield = NULL; 666296341Sdelphij if (!ASN1_item_ex_d2i(&skfield, &p, len, 667296341Sdelphij ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) { 668296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, 669296341Sdelphij ERR_R_NESTED_ASN1_ERROR); 670296341Sdelphij goto err; 671296341Sdelphij } 672296341Sdelphij len -= p - q; 673296341Sdelphij if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) { 674296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE); 675296341Sdelphij goto err; 676296341Sdelphij } 677296341Sdelphij } 678296341Sdelphij if (sk_eoc) { 679296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC); 680296341Sdelphij goto err; 681296341Sdelphij } 682296341Sdelphij } else if (flags & ASN1_TFLG_IMPTAG) { 683296341Sdelphij /* IMPLICIT tagging */ 684296341Sdelphij ret = ASN1_item_ex_d2i(val, &p, len, 685296341Sdelphij ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, 686296341Sdelphij ctx); 687296341Sdelphij if (!ret) { 688296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); 689296341Sdelphij goto err; 690296341Sdelphij } else if (ret == -1) 691296341Sdelphij return -1; 692296341Sdelphij } else { 693296341Sdelphij /* Nothing special */ 694296341Sdelphij ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), 695296341Sdelphij -1, tt->flags & ASN1_TFLG_COMBINE, opt, ctx); 696296341Sdelphij if (!ret) { 697296341Sdelphij ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); 698296341Sdelphij goto err; 699296341Sdelphij } else if (ret == -1) 700296341Sdelphij return -1; 701296341Sdelphij } 702109998Smarkm 703296341Sdelphij *in = p; 704296341Sdelphij return 1; 705109998Smarkm 706296341Sdelphij err: 707296341Sdelphij ASN1_template_free(val, tt); 708296341Sdelphij return 0; 709296341Sdelphij} 710296341Sdelphij 711160814Ssimonstatic int asn1_d2i_ex_primitive(ASN1_VALUE **pval, 712296341Sdelphij const unsigned char **in, long inlen, 713296341Sdelphij const ASN1_ITEM *it, 714296341Sdelphij int tag, int aclass, char opt, ASN1_TLC *ctx) 715296341Sdelphij{ 716296341Sdelphij int ret = 0, utype; 717296341Sdelphij long plen; 718296341Sdelphij char cst, inf, free_cont = 0; 719296341Sdelphij const unsigned char *p; 720296341Sdelphij BUF_MEM buf; 721296341Sdelphij const unsigned char *cont = NULL; 722296341Sdelphij long len; 723296341Sdelphij if (!pval) { 724296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL); 725296341Sdelphij return 0; /* Should never happen */ 726296341Sdelphij } 727109998Smarkm 728296341Sdelphij if (it->itype == ASN1_ITYPE_MSTRING) { 729296341Sdelphij utype = tag; 730296341Sdelphij tag = -1; 731296341Sdelphij } else 732296341Sdelphij utype = it->utype; 733109998Smarkm 734296341Sdelphij if (utype == V_ASN1_ANY) { 735296341Sdelphij /* If type is ANY need to figure out type from tag */ 736296341Sdelphij unsigned char oclass; 737296341Sdelphij if (tag >= 0) { 738296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY); 739296341Sdelphij return 0; 740296341Sdelphij } 741296341Sdelphij if (opt) { 742296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, 743296341Sdelphij ASN1_R_ILLEGAL_OPTIONAL_ANY); 744296341Sdelphij return 0; 745296341Sdelphij } 746296341Sdelphij p = *in; 747296341Sdelphij ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, 748296341Sdelphij &p, inlen, -1, 0, 0, ctx); 749296341Sdelphij if (!ret) { 750296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); 751296341Sdelphij return 0; 752296341Sdelphij } 753296341Sdelphij if (oclass != V_ASN1_UNIVERSAL) 754296341Sdelphij utype = V_ASN1_OTHER; 755296341Sdelphij } 756296341Sdelphij if (tag == -1) { 757296341Sdelphij tag = utype; 758296341Sdelphij aclass = V_ASN1_UNIVERSAL; 759296341Sdelphij } 760296341Sdelphij p = *in; 761296341Sdelphij /* Check header */ 762296341Sdelphij ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, 763296341Sdelphij &p, inlen, tag, aclass, opt, ctx); 764296341Sdelphij if (!ret) { 765296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); 766296341Sdelphij return 0; 767296341Sdelphij } else if (ret == -1) 768296341Sdelphij return -1; 769296341Sdelphij ret = 0; 770296341Sdelphij /* SEQUENCE, SET and "OTHER" are left in encoded form */ 771296341Sdelphij if ((utype == V_ASN1_SEQUENCE) 772296341Sdelphij || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) { 773296341Sdelphij /* 774296341Sdelphij * Clear context cache for type OTHER because the auto clear when we 775296341Sdelphij * have a exact match wont work 776296341Sdelphij */ 777296341Sdelphij if (utype == V_ASN1_OTHER) { 778296341Sdelphij asn1_tlc_clear(ctx); 779296341Sdelphij } 780296341Sdelphij /* SEQUENCE and SET must be constructed */ 781296341Sdelphij else if (!cst) { 782296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, 783296341Sdelphij ASN1_R_TYPE_NOT_CONSTRUCTED); 784296341Sdelphij return 0; 785296341Sdelphij } 786109998Smarkm 787296341Sdelphij cont = *in; 788296341Sdelphij /* If indefinite length constructed find the real end */ 789296341Sdelphij if (inf) { 790296341Sdelphij if (!asn1_find_end(&p, plen, inf)) 791296341Sdelphij goto err; 792296341Sdelphij len = p - cont; 793296341Sdelphij } else { 794296341Sdelphij len = p - cont + plen; 795296341Sdelphij p += plen; 796296341Sdelphij buf.data = NULL; 797296341Sdelphij } 798296341Sdelphij } else if (cst) { 799296341Sdelphij if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN 800296341Sdelphij || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER 801296341Sdelphij || utype == V_ASN1_ENUMERATED) { 802296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE); 803296341Sdelphij return 0; 804296341Sdelphij } 805296341Sdelphij buf.length = 0; 806296341Sdelphij buf.max = 0; 807296341Sdelphij buf.data = NULL; 808296341Sdelphij /* 809296341Sdelphij * Should really check the internal tags are correct but some things 810296341Sdelphij * may get this wrong. The relevant specs say that constructed string 811296341Sdelphij * types should be OCTET STRINGs internally irrespective of the type. 812296341Sdelphij * So instead just check for UNIVERSAL class and ignore the tag. 813296341Sdelphij */ 814296341Sdelphij if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) { 815296341Sdelphij free_cont = 1; 816296341Sdelphij goto err; 817296341Sdelphij } 818296341Sdelphij len = buf.length; 819296341Sdelphij /* Append a final null to string */ 820296341Sdelphij if (!BUF_MEM_grow_clean(&buf, len + 1)) { 821296341Sdelphij ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE); 822296341Sdelphij return 0; 823296341Sdelphij } 824296341Sdelphij buf.data[len] = 0; 825296341Sdelphij cont = (const unsigned char *)buf.data; 826296341Sdelphij free_cont = 1; 827296341Sdelphij } else { 828296341Sdelphij cont = p; 829296341Sdelphij len = plen; 830296341Sdelphij p += plen; 831296341Sdelphij } 832109998Smarkm 833296341Sdelphij /* We now have content length and type: translate into a structure */ 834296341Sdelphij if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) 835296341Sdelphij goto err; 836109998Smarkm 837296341Sdelphij *in = p; 838296341Sdelphij ret = 1; 839296341Sdelphij err: 840296341Sdelphij if (free_cont && buf.data) 841296341Sdelphij OPENSSL_free(buf.data); 842296341Sdelphij return ret; 843296341Sdelphij} 844109998Smarkm 845109998Smarkm/* Translate ASN1 content octets into a structure */ 846109998Smarkm 847160814Ssimonint asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 848296341Sdelphij int utype, char *free_cont, const ASN1_ITEM *it) 849296341Sdelphij{ 850296341Sdelphij ASN1_VALUE **opval = NULL; 851296341Sdelphij ASN1_STRING *stmp; 852296341Sdelphij ASN1_TYPE *typ = NULL; 853296341Sdelphij int ret = 0; 854296341Sdelphij const ASN1_PRIMITIVE_FUNCS *pf; 855296341Sdelphij ASN1_INTEGER **tint; 856296341Sdelphij pf = it->funcs; 857160814Ssimon 858296341Sdelphij if (pf && pf->prim_c2i) 859296341Sdelphij return pf->prim_c2i(pval, cont, len, utype, free_cont, it); 860296341Sdelphij /* If ANY type clear type and set pointer to internal value */ 861296341Sdelphij if (it->utype == V_ASN1_ANY) { 862296341Sdelphij if (!*pval) { 863296341Sdelphij typ = ASN1_TYPE_new(); 864296341Sdelphij if (typ == NULL) 865296341Sdelphij goto err; 866296341Sdelphij *pval = (ASN1_VALUE *)typ; 867296341Sdelphij } else 868296341Sdelphij typ = (ASN1_TYPE *)*pval; 869160814Ssimon 870296341Sdelphij if (utype != typ->type) 871296341Sdelphij ASN1_TYPE_set(typ, utype, NULL); 872296341Sdelphij opval = pval; 873296341Sdelphij pval = &typ->value.asn1_value; 874296341Sdelphij } 875296341Sdelphij switch (utype) { 876296341Sdelphij case V_ASN1_OBJECT: 877296341Sdelphij if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) 878296341Sdelphij goto err; 879296341Sdelphij break; 880109998Smarkm 881296341Sdelphij case V_ASN1_NULL: 882296341Sdelphij if (len) { 883296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH); 884296341Sdelphij goto err; 885296341Sdelphij } 886296341Sdelphij *pval = (ASN1_VALUE *)1; 887296341Sdelphij break; 888109998Smarkm 889296341Sdelphij case V_ASN1_BOOLEAN: 890296341Sdelphij if (len != 1) { 891296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH); 892296341Sdelphij goto err; 893296341Sdelphij } else { 894296341Sdelphij ASN1_BOOLEAN *tbool; 895296341Sdelphij tbool = (ASN1_BOOLEAN *)pval; 896296341Sdelphij *tbool = *cont; 897296341Sdelphij } 898296341Sdelphij break; 899109998Smarkm 900296341Sdelphij case V_ASN1_BIT_STRING: 901296341Sdelphij if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) 902296341Sdelphij goto err; 903296341Sdelphij break; 904109998Smarkm 905296341Sdelphij case V_ASN1_INTEGER: 906296341Sdelphij case V_ASN1_ENUMERATED: 907296341Sdelphij tint = (ASN1_INTEGER **)pval; 908296341Sdelphij if (!c2i_ASN1_INTEGER(tint, &cont, len)) 909296341Sdelphij goto err; 910296341Sdelphij /* Fixup type to match the expected form */ 911296341Sdelphij (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG); 912296341Sdelphij break; 913109998Smarkm 914296341Sdelphij case V_ASN1_OCTET_STRING: 915296341Sdelphij case V_ASN1_NUMERICSTRING: 916296341Sdelphij case V_ASN1_PRINTABLESTRING: 917296341Sdelphij case V_ASN1_T61STRING: 918296341Sdelphij case V_ASN1_VIDEOTEXSTRING: 919296341Sdelphij case V_ASN1_IA5STRING: 920296341Sdelphij case V_ASN1_UTCTIME: 921296341Sdelphij case V_ASN1_GENERALIZEDTIME: 922296341Sdelphij case V_ASN1_GRAPHICSTRING: 923296341Sdelphij case V_ASN1_VISIBLESTRING: 924296341Sdelphij case V_ASN1_GENERALSTRING: 925296341Sdelphij case V_ASN1_UNIVERSALSTRING: 926296341Sdelphij case V_ASN1_BMPSTRING: 927296341Sdelphij case V_ASN1_UTF8STRING: 928296341Sdelphij case V_ASN1_OTHER: 929296341Sdelphij case V_ASN1_SET: 930296341Sdelphij case V_ASN1_SEQUENCE: 931296341Sdelphij default: 932296341Sdelphij if (utype == V_ASN1_BMPSTRING && (len & 1)) { 933296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH); 934296341Sdelphij goto err; 935296341Sdelphij } 936296341Sdelphij if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) { 937296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, 938296341Sdelphij ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH); 939296341Sdelphij goto err; 940296341Sdelphij } 941296341Sdelphij /* All based on ASN1_STRING and handled the same */ 942296341Sdelphij if (!*pval) { 943296341Sdelphij stmp = ASN1_STRING_type_new(utype); 944296341Sdelphij if (!stmp) { 945296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE); 946296341Sdelphij goto err; 947296341Sdelphij } 948296341Sdelphij *pval = (ASN1_VALUE *)stmp; 949296341Sdelphij } else { 950296341Sdelphij stmp = (ASN1_STRING *)*pval; 951296341Sdelphij stmp->type = utype; 952296341Sdelphij } 953296341Sdelphij /* If we've already allocated a buffer use it */ 954296341Sdelphij if (*free_cont) { 955296341Sdelphij if (stmp->data) 956296341Sdelphij OPENSSL_free(stmp->data); 957296341Sdelphij stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */ 958296341Sdelphij stmp->length = len; 959296341Sdelphij *free_cont = 0; 960296341Sdelphij } else { 961296341Sdelphij if (!ASN1_STRING_set(stmp, cont, len)) { 962296341Sdelphij ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE); 963296341Sdelphij ASN1_STRING_free(stmp); 964296341Sdelphij *pval = NULL; 965296341Sdelphij goto err; 966296341Sdelphij } 967296341Sdelphij } 968296341Sdelphij break; 969296341Sdelphij } 970296341Sdelphij /* If ASN1_ANY and NULL type fix up value */ 971296341Sdelphij if (typ && (utype == V_ASN1_NULL)) 972296341Sdelphij typ->value.ptr = NULL; 973109998Smarkm 974296341Sdelphij ret = 1; 975296341Sdelphij err: 976296341Sdelphij if (!ret) { 977296341Sdelphij ASN1_TYPE_free(typ); 978296341Sdelphij if (opval) 979296341Sdelphij *opval = NULL; 980296341Sdelphij } 981296341Sdelphij return ret; 982296341Sdelphij} 983109998Smarkm 984296341Sdelphij/* 985296341Sdelphij * This function finds the end of an ASN1 structure when passed its maximum 986296341Sdelphij * length, whether it is indefinite length and a pointer to the content. This 987296341Sdelphij * is more efficient than calling asn1_collect because it does not recurse on 988296341Sdelphij * each indefinite length header. 989160814Ssimon */ 990160814Ssimon 991160814Ssimonstatic int asn1_find_end(const unsigned char **in, long len, char inf) 992296341Sdelphij{ 993296341Sdelphij int expected_eoc; 994296341Sdelphij long plen; 995296341Sdelphij const unsigned char *p = *in, *q; 996296341Sdelphij /* If not indefinite length constructed just add length */ 997296341Sdelphij if (inf == 0) { 998296341Sdelphij *in += len; 999296341Sdelphij return 1; 1000296341Sdelphij } 1001296341Sdelphij expected_eoc = 1; 1002296341Sdelphij /* 1003296341Sdelphij * Indefinite length constructed form. Find the end when enough EOCs are 1004296341Sdelphij * found. If more indefinite length constructed headers are encountered 1005296341Sdelphij * increment the expected eoc count otherwise just skip to the end of the 1006296341Sdelphij * data. 1007296341Sdelphij */ 1008296341Sdelphij while (len > 0) { 1009296341Sdelphij if (asn1_check_eoc(&p, len)) { 1010296341Sdelphij expected_eoc--; 1011296341Sdelphij if (expected_eoc == 0) 1012296341Sdelphij break; 1013296341Sdelphij len -= 2; 1014296341Sdelphij continue; 1015296341Sdelphij } 1016296341Sdelphij q = p; 1017296341Sdelphij /* Just read in a header: only care about the length */ 1018296341Sdelphij if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len, 1019296341Sdelphij -1, 0, 0, NULL)) { 1020296341Sdelphij ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR); 1021296341Sdelphij return 0; 1022296341Sdelphij } 1023296341Sdelphij if (inf) 1024296341Sdelphij expected_eoc++; 1025296341Sdelphij else 1026296341Sdelphij p += plen; 1027296341Sdelphij len -= p - q; 1028296341Sdelphij } 1029296341Sdelphij if (expected_eoc) { 1030296341Sdelphij ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC); 1031296341Sdelphij return 0; 1032296341Sdelphij } 1033296341Sdelphij *in = p; 1034296341Sdelphij return 1; 1035296341Sdelphij} 1036296341Sdelphij 1037296341Sdelphij/* 1038296341Sdelphij * This function collects the asn1 data from a constructred string type into 1039296341Sdelphij * a buffer. The values of 'in' and 'len' should refer to the contents of the 1040296341Sdelphij * constructed type and 'inf' should be set if it is indefinite length. 1041109998Smarkm */ 1042109998Smarkm 1043194206Ssimon#ifndef ASN1_MAX_STRING_NEST 1044296341Sdelphij/* 1045296341Sdelphij * This determines how many levels of recursion are permitted in ASN1 string 1046296341Sdelphij * types. If it is not limited stack overflows can occur. If set to zero no 1047296341Sdelphij * recursion is allowed at all. Although zero should be adequate examples 1048296341Sdelphij * exist that require a value of 1. So 5 should be more than enough. 1049194206Ssimon */ 1050296341Sdelphij# define ASN1_MAX_STRING_NEST 5 1051194206Ssimon#endif 1052194206Ssimon 1053160814Ssimonstatic int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, 1054296341Sdelphij char inf, int tag, int aclass, int depth) 1055296341Sdelphij{ 1056296341Sdelphij const unsigned char *p, *q; 1057296341Sdelphij long plen; 1058296341Sdelphij char cst, ininf; 1059296341Sdelphij p = *in; 1060296341Sdelphij inf &= 1; 1061296341Sdelphij /* 1062296341Sdelphij * If no buffer and not indefinite length constructed just pass over the 1063296341Sdelphij * encoded data 1064296341Sdelphij */ 1065296341Sdelphij if (!buf && !inf) { 1066296341Sdelphij *in += len; 1067296341Sdelphij return 1; 1068296341Sdelphij } 1069296341Sdelphij while (len > 0) { 1070296341Sdelphij q = p; 1071296341Sdelphij /* Check for EOC */ 1072296341Sdelphij if (asn1_check_eoc(&p, len)) { 1073296341Sdelphij /* 1074296341Sdelphij * EOC is illegal outside indefinite length constructed form 1075296341Sdelphij */ 1076296341Sdelphij if (!inf) { 1077296341Sdelphij ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC); 1078296341Sdelphij return 0; 1079296341Sdelphij } 1080296341Sdelphij inf = 0; 1081296341Sdelphij break; 1082296341Sdelphij } 1083160814Ssimon 1084296341Sdelphij if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, 1085296341Sdelphij len, tag, aclass, 0, NULL)) { 1086296341Sdelphij ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR); 1087296341Sdelphij return 0; 1088296341Sdelphij } 1089160814Ssimon 1090296341Sdelphij /* If indefinite length constructed update max length */ 1091296341Sdelphij if (cst) { 1092296341Sdelphij if (depth >= ASN1_MAX_STRING_NEST) { 1093296341Sdelphij ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING); 1094296341Sdelphij return 0; 1095296341Sdelphij } 1096296341Sdelphij if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1)) 1097296341Sdelphij return 0; 1098296341Sdelphij } else if (plen && !collect_data(buf, &p, plen)) 1099296341Sdelphij return 0; 1100296341Sdelphij len -= p - q; 1101296341Sdelphij } 1102296341Sdelphij if (inf) { 1103296341Sdelphij ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC); 1104296341Sdelphij return 0; 1105296341Sdelphij } 1106296341Sdelphij *in = p; 1107296341Sdelphij return 1; 1108296341Sdelphij} 1109109998Smarkm 1110160814Ssimonstatic int collect_data(BUF_MEM *buf, const unsigned char **p, long plen) 1111296341Sdelphij{ 1112296341Sdelphij int len; 1113296341Sdelphij if (buf) { 1114296341Sdelphij len = buf->length; 1115296341Sdelphij if (!BUF_MEM_grow_clean(buf, len + plen)) { 1116296341Sdelphij ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE); 1117296341Sdelphij return 0; 1118296341Sdelphij } 1119296341Sdelphij memcpy(buf->data + len, *p, plen); 1120296341Sdelphij } 1121296341Sdelphij *p += plen; 1122296341Sdelphij return 1; 1123296341Sdelphij} 1124109998Smarkm 1125109998Smarkm/* Check for ASN1 EOC and swallow it if found */ 1126109998Smarkm 1127160814Ssimonstatic int asn1_check_eoc(const unsigned char **in, long len) 1128296341Sdelphij{ 1129296341Sdelphij const unsigned char *p; 1130296341Sdelphij if (len < 2) 1131296341Sdelphij return 0; 1132296341Sdelphij p = *in; 1133296341Sdelphij if (!p[0] && !p[1]) { 1134296341Sdelphij *in += 2; 1135296341Sdelphij return 1; 1136296341Sdelphij } 1137296341Sdelphij return 0; 1138296341Sdelphij} 1139109998Smarkm 1140296341Sdelphij/* 1141296341Sdelphij * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the 1142296341Sdelphij * length for indefinite length constructed form, we don't know the exact 1143296341Sdelphij * length but we can set an upper bound to the amount of data available minus 1144296341Sdelphij * the header length just read. 1145109998Smarkm */ 1146109998Smarkm 1147160814Ssimonstatic int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, 1148296341Sdelphij char *inf, char *cst, 1149296341Sdelphij const unsigned char **in, long len, 1150296341Sdelphij int exptag, int expclass, char opt, ASN1_TLC *ctx) 1151296341Sdelphij{ 1152296341Sdelphij int i; 1153296341Sdelphij int ptag, pclass; 1154296341Sdelphij long plen; 1155296341Sdelphij const unsigned char *p, *q; 1156296341Sdelphij p = *in; 1157296341Sdelphij q = p; 1158109998Smarkm 1159296341Sdelphij if (ctx && ctx->valid) { 1160296341Sdelphij i = ctx->ret; 1161296341Sdelphij plen = ctx->plen; 1162296341Sdelphij pclass = ctx->pclass; 1163296341Sdelphij ptag = ctx->ptag; 1164296341Sdelphij p += ctx->hdrlen; 1165296341Sdelphij } else { 1166296341Sdelphij i = ASN1_get_object(&p, &plen, &ptag, &pclass, len); 1167296341Sdelphij if (ctx) { 1168296341Sdelphij ctx->ret = i; 1169296341Sdelphij ctx->plen = plen; 1170296341Sdelphij ctx->pclass = pclass; 1171296341Sdelphij ctx->ptag = ptag; 1172296341Sdelphij ctx->hdrlen = p - q; 1173296341Sdelphij ctx->valid = 1; 1174296341Sdelphij /* 1175296341Sdelphij * If definite length, and no error, length + header can't exceed 1176296341Sdelphij * total amount of data available. 1177296341Sdelphij */ 1178296341Sdelphij if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) { 1179296341Sdelphij ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG); 1180296341Sdelphij asn1_tlc_clear(ctx); 1181296341Sdelphij return 0; 1182296341Sdelphij } 1183296341Sdelphij } 1184296341Sdelphij } 1185109998Smarkm 1186296341Sdelphij if (i & 0x80) { 1187296341Sdelphij ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER); 1188296341Sdelphij asn1_tlc_clear(ctx); 1189296341Sdelphij return 0; 1190296341Sdelphij } 1191296341Sdelphij if (exptag >= 0) { 1192296341Sdelphij if ((exptag != ptag) || (expclass != pclass)) { 1193296341Sdelphij /* 1194296341Sdelphij * If type is OPTIONAL, not an error: indicate missing type. 1195296341Sdelphij */ 1196296341Sdelphij if (opt) 1197296341Sdelphij return -1; 1198296341Sdelphij asn1_tlc_clear(ctx); 1199296341Sdelphij ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG); 1200296341Sdelphij return 0; 1201296341Sdelphij } 1202296341Sdelphij /* 1203296341Sdelphij * We have a tag and class match: assume we are going to do something 1204296341Sdelphij * with it 1205296341Sdelphij */ 1206296341Sdelphij asn1_tlc_clear(ctx); 1207296341Sdelphij } 1208109998Smarkm 1209296341Sdelphij if (i & 1) 1210296341Sdelphij plen = len - (p - q); 1211109998Smarkm 1212296341Sdelphij if (inf) 1213296341Sdelphij *inf = i & 1; 1214109998Smarkm 1215296341Sdelphij if (cst) 1216296341Sdelphij *cst = i & V_ASN1_CONSTRUCTED; 1217109998Smarkm 1218296341Sdelphij if (olen) 1219296341Sdelphij *olen = plen; 1220109998Smarkm 1221296341Sdelphij if (oclass) 1222296341Sdelphij *oclass = pclass; 1223160814Ssimon 1224296341Sdelphij if (otag) 1225296341Sdelphij *otag = ptag; 1226160814Ssimon 1227296341Sdelphij *in = p; 1228296341Sdelphij return 1; 1229296341Sdelphij} 1230