diff options
Diffstat (limited to 'crypto/asn1/tasn_dec.c')
| -rw-r--r-- | crypto/asn1/tasn_dec.c | 2312 |
1 files changed, 1079 insertions, 1233 deletions
diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c index 18e9f9be4f..4595664409 100644 --- a/crypto/asn1/tasn_dec.c +++ b/crypto/asn1/tasn_dec.c @@ -1,6 +1,7 @@ /* tasn_dec.c */ -/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL - * project 2000. +/* + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project + * 2000. */ /* ==================================================================== * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. @@ -10,7 +11,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in @@ -56,7 +57,6 @@ * */ - #include <stddef.h> #include <string.h> #include <openssl/asn1.h> @@ -69,1296 +69,1142 @@ static int asn1_check_eoc(const unsigned char **in, long len); static int asn1_find_end(const unsigned char **in, long len, char inf); static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, - char inf, int tag, int aclass, int depth); + char inf, int tag, int aclass, int depth); static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen); static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, - char *inf, char *cst, - const unsigned char **in, long len, - int exptag, int expclass, char opt, - ASN1_TLC *ctx); + char *inf, char *cst, + const unsigned char **in, long len, + int exptag, int expclass, char opt, ASN1_TLC *ctx); static int asn1_template_ex_d2i(ASN1_VALUE **pval, - const unsigned char **in, long len, - const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx); + const unsigned char **in, long len, + const ASN1_TEMPLATE *tt, char opt, + ASN1_TLC *ctx); static int asn1_template_noexp_d2i(ASN1_VALUE **val, - const unsigned char **in, long len, - const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx); + const unsigned char **in, long len, + const ASN1_TEMPLATE *tt, char opt, + ASN1_TLC *ctx); static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, - const unsigned char **in, long len, - const ASN1_ITEM *it, - int tag, int aclass, char opt, ASN1_TLC *ctx); + const unsigned char **in, long len, + const ASN1_ITEM *it, + int tag, int aclass, char opt, + ASN1_TLC *ctx); /* Table to convert tags to bit values, used for MSTRING type */ static const unsigned long tag2bit[32] = { /* tags 0 - 3 */ -0, 0, 0, B_ASN1_BIT_STRING, + 0, 0, 0, B_ASN1_BIT_STRING, /* tags 4- 7 */ -B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN, + B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN, /* tags 8-11 */ -B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, + B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, /* tags 12-15 */ -B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN, + B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, /* tags 16-19 */ -B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, + B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING, /* tags 20-22 */ -B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, + B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING, /* tags 23-24 */ -B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, + B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 25-27 */ -B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, + B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING, /* tags 28-31 */ -B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, - }; + B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN, +}; unsigned long ASN1_tag2bit(int tag) - { - if ((tag < 0) || (tag > 30)) return 0; - return tag2bit[tag]; - } +{ + if ((tag < 0) || (tag > 30)) + return 0; + return tag2bit[tag]; +} /* Macro to initialize and invalidate the cache */ -#define asn1_tlc_clear(c) if (c) (c)->valid = 0 +#define asn1_tlc_clear(c) if (c) (c)->valid = 0 /* Version to avoid compiler warning about 'c' always non-NULL */ -#define asn1_tlc_clear_nc(c) (c)->valid = 0 - -/* Decode an ASN1 item, this currently behaves just - * like a standard 'd2i' function. 'in' points to - * a buffer to read the data from, in future we will - * have more advanced versions that can input data - * a piece at a time and this will simply be a special - * case. +#define asn1_tlc_clear_nc(c) (c)->valid = 0 + +/* + * Decode an ASN1 item, this currently behaves just like a standard 'd2i' + * function. 'in' points to a buffer to read the data from, in future we + * will have more advanced versions that can input data a piece at a time and + * this will simply be a special case. */ ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, - const unsigned char **in, long len, const ASN1_ITEM *it) - { - ASN1_TLC c; - ASN1_VALUE *ptmpval = NULL; - if (!pval) - pval = &ptmpval; - asn1_tlc_clear_nc(&c); - if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) - return *pval; - return NULL; - } + const unsigned char **in, long len, + const ASN1_ITEM *it) +{ + ASN1_TLC c; + ASN1_VALUE *ptmpval = NULL; + if (!pval) + pval = &ptmpval; + asn1_tlc_clear_nc(&c); + if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) + return *pval; + return NULL; +} int ASN1_template_d2i(ASN1_VALUE **pval, - const unsigned char **in, long len, const ASN1_TEMPLATE *tt) - { - ASN1_TLC c; - asn1_tlc_clear_nc(&c); - return asn1_template_ex_d2i(pval, in, len, tt, 0, &c); - } - - -/* Decode an item, taking care of IMPLICIT tagging, if any. - * If 'opt' set and tag mismatch return -1 to handle OPTIONAL + const unsigned char **in, long len, + const ASN1_TEMPLATE *tt) +{ + ASN1_TLC c; + asn1_tlc_clear_nc(&c); + return asn1_template_ex_d2i(pval, in, len, tt, 0, &c); +} + +/* + * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and + * tag mismatch return -1 to handle OPTIONAL */ int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, - const ASN1_ITEM *it, - int tag, int aclass, char opt, ASN1_TLC *ctx) - { - const ASN1_TEMPLATE *tt, *errtt = NULL; - const ASN1_COMPAT_FUNCS *cf; - const ASN1_EXTERN_FUNCS *ef; - const ASN1_AUX *aux = it->funcs; - ASN1_aux_cb *asn1_cb; - const unsigned char *p = NULL, *q; - unsigned char *wp=NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */ - unsigned char imphack = 0, oclass; - char seq_eoc, seq_nolen, cst, isopt; - long tmplen; - int i; - int otag; - int ret = 0; - ASN1_VALUE **pchptr, *ptmpval; - if (!pval) - return 0; - if (aux && aux->asn1_cb) - asn1_cb = aux->asn1_cb; - else asn1_cb = 0; - - switch(it->itype) - { - case ASN1_ITYPE_PRIMITIVE: - if (it->templates) - { - /* tagging or OPTIONAL is currently illegal on an item - * template because the flags can't get passed down. - * In practice this isn't a problem: we include the - * relevant flags from the item template in the - * template itself. - */ - if ((tag != -1) || opt) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE); - goto err; - } - return asn1_template_ex_d2i(pval, in, len, - it->templates, opt, ctx); - } - return asn1_d2i_ex_primitive(pval, in, len, it, - tag, aclass, opt, ctx); - break; - - case ASN1_ITYPE_MSTRING: - p = *in; - /* Just read in tag and class */ - ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, - &p, len, -1, 0, 1, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - - /* Must be UNIVERSAL class */ - if (oclass != V_ASN1_UNIVERSAL) - { - /* If OPTIONAL, assume this is OK */ - if (opt) return -1; - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_MSTRING_NOT_UNIVERSAL); - goto err; - } - /* Check tag matches bit map */ - if (!(ASN1_tag2bit(otag) & it->utype)) - { - /* If OPTIONAL, assume this is OK */ - if (opt) - return -1; - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_MSTRING_WRONG_TAG); - goto err; - } - return asn1_d2i_ex_primitive(pval, in, len, - it, otag, 0, 0, ctx); - - case ASN1_ITYPE_EXTERN: - /* Use new style d2i */ - ef = it->funcs; - return ef->asn1_ex_d2i(pval, in, len, - it, tag, aclass, opt, ctx); - - case ASN1_ITYPE_COMPAT: - /* we must resort to old style evil hackery */ - cf = it->funcs; - - /* If OPTIONAL see if it is there */ - if (opt) - { - int exptag; - p = *in; - if (tag == -1) - exptag = it->utype; - else exptag = tag; - /* Don't care about anything other than presence - * of expected tag */ - - ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, - &p, len, exptag, aclass, 1, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - if (ret == -1) - return -1; - } - - /* This is the old style evil hack IMPLICIT handling: - * since the underlying code is expecting a tag and - * class other than the one present we change the - * buffer temporarily then change it back afterwards. - * This doesn't and never did work for tags > 30. - * - * Yes this is *horrible* but it is only needed for - * old style d2i which will hopefully not be around - * for much longer. - * FIXME: should copy the buffer then modify it so - * the input buffer can be const: we should *always* - * copy because the old style d2i might modify the - * buffer. - */ - - if (tag != -1) - { - wp = *(unsigned char **)in; - imphack = *wp; - if (p == NULL) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED) - | it->utype); - } - - ptmpval = cf->asn1_d2i(pval, in, len); - - if (tag != -1) - *wp = imphack; - - if (ptmpval) - return 1; - - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); - goto err; - - - case ASN1_ITYPE_CHOICE: - if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) - goto auxerr; - - /* Allocate structure */ - if (!*pval && !ASN1_item_ex_new(pval, it)) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - /* CHOICE type, try each possibility in turn */ - p = *in; - for (i = 0, tt=it->templates; i < it->tcount; i++, tt++) - { - pchptr = asn1_get_field_ptr(pval, tt); - /* We mark field as OPTIONAL so its absence - * can be recognised. - */ - ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx); - /* If field not present, try the next one */ - if (ret == -1) - continue; - /* If positive return, read OK, break loop */ - if (ret > 0) - break; - /* Otherwise must be an ASN1 parsing error */ - errtt = tt; - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - - /* Did we fall off the end without reading anything? */ - if (i == it->tcount) - { - /* If OPTIONAL, this is OK */ - if (opt) - { - /* Free and zero it */ - ASN1_item_ex_free(pval, it); - return -1; - } - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_NO_MATCHING_CHOICE_TYPE); - goto err; - } - - asn1_set_choice_selector(pval, i, it); - *in = p; - if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) - goto auxerr; - return 1; - - case ASN1_ITYPE_NDEF_SEQUENCE: - case ASN1_ITYPE_SEQUENCE: - p = *in; - tmplen = len; - - /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ - if (tag == -1) - { - tag = V_ASN1_SEQUENCE; - aclass = V_ASN1_UNIVERSAL; - } - /* Get SEQUENCE length and update len, p */ - ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, - &p, len, tag, aclass, opt, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - else if (ret == -1) - return -1; - if (aux && (aux->flags & ASN1_AFLG_BROKEN)) - { - len = tmplen - (p - *in); - seq_nolen = 1; - } - /* If indefinite we don't do a length check */ - else seq_nolen = seq_eoc; - if (!cst) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_SEQUENCE_NOT_CONSTRUCTED); - goto err; - } - - if (!*pval && !ASN1_item_ex_new(pval, it)) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - - if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) - goto auxerr; - - /* Get each field entry */ - for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) - { - const ASN1_TEMPLATE *seqtt; - ASN1_VALUE **pseqval; - seqtt = asn1_do_adb(pval, tt, 1); - if (!seqtt) - goto err; - pseqval = asn1_get_field_ptr(pval, seqtt); - /* Have we ran out of data? */ - if (!len) - break; - q = p; - if (asn1_check_eoc(&p, len)) - { - if (!seq_eoc) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_UNEXPECTED_EOC); - goto err; - } - len -= p - q; - seq_eoc = 0; - q = p; - break; - } - /* This determines the OPTIONAL flag value. The field - * cannot be omitted if it is the last of a SEQUENCE - * and there is still data to be read. This isn't - * strictly necessary but it increases efficiency in - * some cases. - */ - if (i == (it->tcount - 1)) - isopt = 0; - else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL); - /* attempt to read in field, allowing each to be - * OPTIONAL */ - - ret = asn1_template_ex_d2i(pseqval, &p, len, - seqtt, isopt, ctx); - if (!ret) - { - errtt = seqtt; - goto err; - } - else if (ret == -1) - { - /* OPTIONAL component absent. - * Free and zero the field. - */ - ASN1_template_free(pseqval, seqtt); - continue; - } - /* Update length */ - len -= p - q; - } - - /* Check for EOC if expecting one */ - if (seq_eoc && !asn1_check_eoc(&p, len)) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC); - goto err; - } - /* Check all data read */ - if (!seq_nolen && len) - { - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_SEQUENCE_LENGTH_MISMATCH); - goto err; - } - - /* If we get here we've got no more data in the SEQUENCE, - * however we may not have read all fields so check all - * remaining are OPTIONAL and clear any that are. - */ - for (; i < it->tcount; tt++, i++) - { - const ASN1_TEMPLATE *seqtt; - seqtt = asn1_do_adb(pval, tt, 1); - if (!seqtt) - goto err; - if (seqtt->flags & ASN1_TFLG_OPTIONAL) - { - ASN1_VALUE **pseqval; - pseqval = asn1_get_field_ptr(pval, seqtt); - ASN1_template_free(pseqval, seqtt); - } - else - { - errtt = seqtt; - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, - ASN1_R_FIELD_MISSING); - goto err; - } - } - /* Save encoding */ - if (!asn1_enc_save(pval, *in, p - *in, it)) - goto auxerr; - *in = p; - if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) - goto auxerr; - return 1; - - default: - return 0; - } - auxerr: - ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR); - err: - ASN1_item_ex_free(pval, it); - if (errtt) - ERR_add_error_data(4, "Field=", errtt->field_name, - ", Type=", it->sname); - else - ERR_add_error_data(2, "Type=", it->sname); - return 0; - } - -/* Templates are handled with two separate functions. - * One handles any EXPLICIT tag and the other handles the rest. + const ASN1_ITEM *it, + int tag, int aclass, char opt, ASN1_TLC *ctx) +{ + const ASN1_TEMPLATE *tt, *errtt = NULL; + const ASN1_COMPAT_FUNCS *cf; + const ASN1_EXTERN_FUNCS *ef; + const ASN1_AUX *aux = it->funcs; + ASN1_aux_cb *asn1_cb; + const unsigned char *p = NULL, *q; + unsigned char *wp = NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */ + unsigned char imphack = 0, oclass; + char seq_eoc, seq_nolen, cst, isopt; + long tmplen; + int i; + int otag; + int ret = 0; + ASN1_VALUE **pchptr, *ptmpval; + if (!pval) + return 0; + if (aux && aux->asn1_cb) + asn1_cb = aux->asn1_cb; + else + asn1_cb = 0; + + switch (it->itype) { + case ASN1_ITYPE_PRIMITIVE: + if (it->templates) { + /* + * tagging or OPTIONAL is currently illegal on an item template + * because the flags can't get passed down. In practice this + * isn't a problem: we include the relevant flags from the item + * template in the template itself. + */ + if ((tag != -1) || opt) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, + ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE); + goto err; + } + return asn1_template_ex_d2i(pval, in, len, + it->templates, opt, ctx); + } + return asn1_d2i_ex_primitive(pval, in, len, it, + tag, aclass, opt, ctx); + break; + + case ASN1_ITYPE_MSTRING: + p = *in; + /* Just read in tag and class */ + ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, + &p, len, -1, 0, 1, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + + /* Must be UNIVERSAL class */ + if (oclass != V_ASN1_UNIVERSAL) { + /* If OPTIONAL, assume this is OK */ + if (opt) + return -1; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL); + goto err; + } + /* Check tag matches bit map */ + if (!(ASN1_tag2bit(otag) & it->utype)) { + /* If OPTIONAL, assume this is OK */ + if (opt) + return -1; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MSTRING_WRONG_TAG); + goto err; + } + return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx); + + case ASN1_ITYPE_EXTERN: + /* Use new style d2i */ + ef = it->funcs; + return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx); + + case ASN1_ITYPE_COMPAT: + /* we must resort to old style evil hackery */ + cf = it->funcs; + + /* If OPTIONAL see if it is there */ + if (opt) { + int exptag; + p = *in; + if (tag == -1) + exptag = it->utype; + else + exptag = tag; + /* + * Don't care about anything other than presence of expected tag + */ + + ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL, + &p, len, exptag, aclass, 1, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + if (ret == -1) + return -1; + } + + /* + * This is the old style evil hack IMPLICIT handling: since the + * underlying code is expecting a tag and class other than the one + * present we change the buffer temporarily then change it back + * afterwards. This doesn't and never did work for tags > 30. Yes + * this is *horrible* but it is only needed for old style d2i which + * will hopefully not be around for much longer. FIXME: should copy + * the buffer then modify it so the input buffer can be const: we + * should *always* copy because the old style d2i might modify the + * buffer. + */ + + if (tag != -1) { + wp = *(unsigned char **)in; + imphack = *wp; + if (p == NULL) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED) + | it->utype); + } + + ptmpval = cf->asn1_d2i(pval, in, len); + + if (tag != -1) + *wp = imphack; + + if (ptmpval) + return 1; + + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + + case ASN1_ITYPE_CHOICE: + if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) + goto auxerr; + + /* Allocate structure */ + if (!*pval && !ASN1_item_ex_new(pval, it)) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + /* CHOICE type, try each possibility in turn */ + p = *in; + for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { + pchptr = asn1_get_field_ptr(pval, tt); + /* + * We mark field as OPTIONAL so its absence can be recognised. + */ + ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx); + /* If field not present, try the next one */ + if (ret == -1) + continue; + /* If positive return, read OK, break loop */ + if (ret > 0) + break; + /* Otherwise must be an ASN1 parsing error */ + errtt = tt; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + + /* Did we fall off the end without reading anything? */ + if (i == it->tcount) { + /* If OPTIONAL, this is OK */ + if (opt) { + /* Free and zero it */ + ASN1_item_ex_free(pval, it); + return -1; + } + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE); + goto err; + } + + asn1_set_choice_selector(pval, i, it); + *in = p; + if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) + goto auxerr; + return 1; + + case ASN1_ITYPE_NDEF_SEQUENCE: + case ASN1_ITYPE_SEQUENCE: + p = *in; + tmplen = len; + + /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ + if (tag == -1) { + tag = V_ASN1_SEQUENCE; + aclass = V_ASN1_UNIVERSAL; + } + /* Get SEQUENCE length and update len, p */ + ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, + &p, len, tag, aclass, opt, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } else if (ret == -1) + return -1; + if (aux && (aux->flags & ASN1_AFLG_BROKEN)) { + len = tmplen - (p - *in); + seq_nolen = 1; + } + /* If indefinite we don't do a length check */ + else + seq_nolen = seq_eoc; + if (!cst) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED); + goto err; + } + + if (!*pval && !ASN1_item_ex_new(pval, it)) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + + if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) + goto auxerr; + + /* Get each field entry */ + for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { + const ASN1_TEMPLATE *seqtt; + ASN1_VALUE **pseqval; + seqtt = asn1_do_adb(pval, tt, 1); + if (!seqtt) + goto err; + pseqval = asn1_get_field_ptr(pval, seqtt); + /* Have we ran out of data? */ + if (!len) + break; + q = p; + if (asn1_check_eoc(&p, len)) { + if (!seq_eoc) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_UNEXPECTED_EOC); + goto err; + } + len -= p - q; + seq_eoc = 0; + q = p; + break; + } + /* + * This determines the OPTIONAL flag value. The field cannot be + * omitted if it is the last of a SEQUENCE and there is still + * data to be read. This isn't strictly necessary but it + * increases efficiency in some cases. + */ + if (i == (it->tcount - 1)) + isopt = 0; + else + isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL); + /* + * attempt to read in field, allowing each to be OPTIONAL + */ + + ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx); + if (!ret) { + errtt = seqtt; + goto err; + } else if (ret == -1) { + /* + * OPTIONAL component absent. Free and zero the field. + */ + ASN1_template_free(pseqval, seqtt); + continue; + } + /* Update length */ + len -= p - q; + } + + /* Check for EOC if expecting one */ + if (seq_eoc && !asn1_check_eoc(&p, len)) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC); + goto err; + } + /* Check all data read */ + if (!seq_nolen && len) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH); + goto err; + } + + /* + * If we get here we've got no more data in the SEQUENCE, however we + * may not have read all fields so check all remaining are OPTIONAL + * and clear any that are. + */ + for (; i < it->tcount; tt++, i++) { + const ASN1_TEMPLATE *seqtt; + seqtt = asn1_do_adb(pval, tt, 1); + if (!seqtt) + goto err; + if (seqtt->flags & ASN1_TFLG_OPTIONAL) { + ASN1_VALUE **pseqval; + pseqval = asn1_get_field_ptr(pval, seqtt); + ASN1_template_free(pseqval, seqtt); + } else { + errtt = seqtt; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_FIELD_MISSING); + goto err; + } + } + /* Save encoding */ + if (!asn1_enc_save(pval, *in, p - *in, it)) + goto auxerr; + *in = p; + if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) + goto auxerr; + return 1; + + default: + return 0; + } + auxerr: + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR); + err: + ASN1_item_ex_free(pval, it); + if (errtt) + ERR_add_error_data(4, "Field=", errtt->field_name, + ", Type=", it->sname); + else + ERR_add_error_data(2, "Type=", it->sname); + return 0; +} + +/* + * Templates are handled with two separate functions. One handles any + * EXPLICIT tag and the other handles the rest. */ static int asn1_template_ex_d2i(ASN1_VALUE **val, - const unsigned char **in, long inlen, - const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx) - { - int flags, aclass; - int ret; - long len; - const unsigned char *p, *q; - char exp_eoc; - if (!val) - return 0; - flags = tt->flags; - aclass = flags & ASN1_TFLG_TAG_CLASS; - - p = *in; - - /* Check if EXPLICIT tag expected */ - if (flags & ASN1_TFLG_EXPTAG) - { - char cst; - /* Need to work out amount of data available to the inner - * content and where it starts: so read in EXPLICIT header to - * get the info. - */ - ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, - &p, inlen, tt->tag, aclass, opt, ctx); - q = p; - if (!ret) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - return 0; - } - else if (ret == -1) - return -1; - if (!cst) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, - ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED); - return 0; - } - /* We've found the field so it can't be OPTIONAL now */ - ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, - ERR_R_NESTED_ASN1_ERROR); - return 0; - } - /* We read the field in OK so update length */ - len -= p - q; - if (exp_eoc) - { - /* If NDEF we must have an EOC here */ - if (!asn1_check_eoc(&p, len)) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, - ASN1_R_MISSING_EOC); - goto err; - } - } - else - { - /* Otherwise we must hit the EXPLICIT tag end or its - * an error */ - if (len) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, - ASN1_R_EXPLICIT_LENGTH_MISMATCH); - goto err; - } - } - } - else - return asn1_template_noexp_d2i(val, in, inlen, - tt, opt, ctx); - - *in = p; - return 1; - - err: - ASN1_template_free(val, tt); - return 0; - } + const unsigned char **in, long inlen, + const ASN1_TEMPLATE *tt, char opt, + ASN1_TLC *ctx) +{ + int flags, aclass; + int ret; + long len; + const unsigned char *p, *q; + char exp_eoc; + if (!val) + return 0; + flags = tt->flags; + aclass = flags & ASN1_TFLG_TAG_CLASS; + + p = *in; + + /* Check if EXPLICIT tag expected */ + if (flags & ASN1_TFLG_EXPTAG) { + char cst; + /* + * Need to work out amount of data available to the inner content and + * where it starts: so read in EXPLICIT header to get the info. + */ + ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, + &p, inlen, tt->tag, aclass, opt, ctx); + q = p; + if (!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + return 0; + } else if (ret == -1) + return -1; + if (!cst) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, + ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED); + return 0; + } + /* We've found the field so it can't be OPTIONAL now */ + ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + return 0; + } + /* We read the field in OK so update length */ + len -= p - q; + if (exp_eoc) { + /* If NDEF we must have an EOC here */ + if (!asn1_check_eoc(&p, len)) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC); + goto err; + } + } else { + /* + * Otherwise we must hit the EXPLICIT tag end or its an error + */ + if (len) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, + ASN1_R_EXPLICIT_LENGTH_MISMATCH); + goto err; + } + } + } else + return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx); + + *in = p; + return 1; + + err: + ASN1_template_free(val, tt); + return 0; +} static int asn1_template_noexp_d2i(ASN1_VALUE **val, - const unsigned char **in, long len, - const ASN1_TEMPLATE *tt, char opt, - ASN1_TLC *ctx) - { - int flags, aclass; - int ret; - const unsigned char *p, *q; - if (!val) - return 0; - flags = tt->flags; - aclass = flags & ASN1_TFLG_TAG_CLASS; - - p = *in; - q = p; - - if (flags & ASN1_TFLG_SK_MASK) - { - /* SET OF, SEQUENCE OF */ - int sktag, skaclass; - char sk_eoc; - /* First work out expected inner tag value */ - if (flags & ASN1_TFLG_IMPTAG) - { - sktag = tt->tag; - skaclass = aclass; - } - else - { - skaclass = V_ASN1_UNIVERSAL; - if (flags & ASN1_TFLG_SET_OF) - sktag = V_ASN1_SET; - else - sktag = V_ASN1_SEQUENCE; - } - /* Get the tag */ - ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, - &p, len, sktag, skaclass, opt, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_NESTED_ASN1_ERROR); - return 0; - } - else if (ret == -1) - return -1; - if (!*val) - *val = (ASN1_VALUE *)sk_new_null(); - else - { - /* We've got a valid STACK: free up any items present */ - STACK_OF(ASN1_VALUE) *sktmp - = (STACK_OF(ASN1_VALUE) *)*val; - ASN1_VALUE *vtmp; - while(sk_AS |