diff options
Diffstat (limited to 'crypto/asn1/tasn_dec.c')
| -rw-r--r-- | crypto/asn1/tasn_dec.c | 2339 |
1 files changed, 1106 insertions, 1233 deletions
diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c index 2cbfa8147596..7fd336a40226 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> @@ -69,1287 +69,1160 @@ 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] = { -0, 0, 0, B_ASN1_BIT_STRING, /* tags 0 - 3 */ -B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,/* tags 4- 7 */ -B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 8-11 */ -B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */ -B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */ -B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING, /* tags 20-22 */ -B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, /* tags 23-24 */ -B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING, /* tags 25-27 */ -B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */ - }; + /* tags 0 - 3 */ + 0, 0, 0, B_ASN1_BIT_STRING, + /* tags 4- 7 */ + B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN, + /* tags 8-11 */ + 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, + /* tags 16-19 */ + B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING, + /* tags 20-22 */ + B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING, + /* tags 23-24 */ + B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, + /* tags 25-27 */ + B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING, + /* tags 28-31 */ + 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; + if (*pval) { + /* Free up and zero CHOICE value if initialised */ + i = asn1_get_choice_selector(pval, it); + if ((i >= 0) && (i < it->tcount)) { + tt = it->templates + i; + pchptr = asn1_get_field_ptr(pval, tt); + ASN1_template_free(pchptr, tt); + asn1_set_choice_selector(pval, -1, it); + } + } else if (!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; + + /* Free up and zero any ADB found */ + for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { + if (tt->flags & ASN1_TFLG_ADB_MASK) { + const ASN1_TEMPLATE *seqtt; + ASN1_VALUE **pseqval; + seqtt = asn1_do_adb(pval, tt, 1); + pseqval = asn1_get_field_ptr(pval, seqtt); + ASN1_template_free(pseqval, seqtt); + } + } + + /* 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_ASN1_VALUE_num(sktmp) > 0) - { - vtmp = sk_ASN1_VALUE_pop(sktmp); - ASN1_item_ex_free(&vtmp, - ASN1_ITEM_ptr(tt->item)); - } - } - - if (!*val) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_MALLOC_FAILURE); - goto err; - } - - /* Read as many items as we can */ - while(len > 0) - { - ASN1_VALUE *skfield; - q = p; - /* See if EOC found */ - if (asn1_check_eoc(&p, len)) - { - if (!sk_eoc) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ASN1_R_UNEXPECTED_EOC); - goto err; - } - len -= p - q; - sk_eoc = 0; - break; - } - skfield = NULL; - if (!ASN1_item_ex_d2i(&skfield, &p, len, - ASN1_ITEM_ptr(tt->item), - -1, 0, 0, ctx)) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - len -= p - q; - if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, - skfield)) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_MALLOC_FAILURE); - goto err; - } - } - if (sk_eoc) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC); - goto err; - } - } - else if (flags & ASN1_TFLG_IMPTAG) - { - /* IMPLICIT tagging */ - ret = ASN1_item_ex_d2i(val, &p, len, - ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - else if (ret == -1) - return -1; - } - else - { - /* Nothing special */ - ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), - -1, 0, opt, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, - ERR_R_NESTED_ASN1_ERROR); - goto err; - } - else if (ret == -1) - return -1; - } - - *in = p; - return 1; - - err: - ASN1_template_free(val, tt); - return 0; - } + 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_ASN1_VALUE_num(sktmp) > 0) { + vtmp = sk_ASN1_VALUE_pop(sktmp); + ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item)); + } + } + + if (!*val) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE); + goto err; + } + + /* Read as many items as we can */ + while (len > 0) { + ASN1_VALUE *skfield; + q = p; + /* See if EOC found */ + if (asn1_check_eoc(&p, len)) { + if (!sk_eoc) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, + ASN1_R_UNEXPECTED_EOC); + goto err; + } + len -= p - q; + sk_eoc = 0; + break; + } + skfield = NULL; + if (!ASN1_item_ex_d2i(&skfield, &p, len, + ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, + ERR_R_NESTED_ASN1_ERROR); + goto err; + } + len -= p - q; + if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE); + goto err; + } + } + if (sk_eoc) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC); + goto err; + } + } else if (flags & ASN1_TFLG_IMPTAG) { + /* IMPLICIT tagging */ + ret = ASN1_item_ex_d2i(val, &p, len, + ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, + ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } else if (ret == -1) + return -1; + } else { + /* Nothing special */ + ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), + -1, 0, opt, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } else if (ret == -1) + return -1; + } + + *in = p; + return 1; + + err: + ASN1_template_free(val, tt); + return 0; +} static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, - const unsigned char **in, long inlen, - const ASN1_ITEM *it, - int tag, int aclass, char opt, ASN1_TLC *ctx) - { - int ret = 0, utype; - long plen; - char cst, inf, free_cont = 0; - const unsigned char *p; - BUF_MEM buf; - const unsigned char *cont = NULL; - long len; - if (!pval) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL); - return 0; /* Should never happen */ - } - - if (it->itype == ASN1_ITYPE_MSTRING) - { - utype = tag; - tag = -1; - } - else - utype = it->utype; - - if (utype == V_ASN1_ANY) - { - /* If type is ANY need to figure out type from tag */ - unsigned char oclass; - if (tag >= 0) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ASN1_R_ILLEGAL_TAGGED_ANY); - return 0; - } - if (opt) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ASN1_R_ILLEGAL_OPTIONAL_ANY); - return 0; - } - p = *in; - ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, - &p, inlen, -1, 0, 0, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ERR_R_NESTED_ASN1_ERROR); - return 0; - } - if (oclass != V_ASN1_UNIVERSAL) - utype = V_ASN1_OTHER; - } - if (tag == -1) - { - tag = utype; - aclass = V_ASN1_UNIVERSAL; - } - p = *in; - /* Check header */ - ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, - &p, inlen, tag, aclass, opt, ctx); - if (!ret) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); - return 0; - } - else if (ret == -1) - return -1; - ret = 0; - /* SEQUENCE, SET and "OTHER" are left in encoded form */ - if ((utype == V_ASN1_SEQUENCE) - || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) - { - /* Clear context cache for type OTHER because the auto clear - * when we have a exact match wont work - */ - if (utype == V_ASN1_OTHER) - { - asn1_tlc_clear(ctx); - } - /* SEQUENCE and SET must be constructed */ - else if (!cst) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ASN1_R_TYPE_NOT_CONSTRUCTED); - return 0; - } - - cont = *in; - /* If indefinite length constructed find the real end */ - if (inf) - { - if (!asn1_find_end(&p, plen, inf)) - goto err; - len = p - cont; - } - else - { - len = p - cont + plen; - p += plen; - buf.data = NULL; - } - } - else if (cst) - { - if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN - || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER - || utype == V_ASN1_ENUMERATED) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ASN1_R_TYPE_NOT_PRIMITIVE); - return 0; - } - buf.length = 0; - buf.max = 0; - buf.data = NULL; - /* Should really check the internal tags are correct but - * some things may get this wrong. The relevant specs - * say that constructed string types should be OCTET STRINGs - * internally irrespective of the type. So instead just check - * for UNIVERSAL class and ignore the tag. - */ - if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) - { - free_cont = 1; - goto err; - } - len = buf.length; - /* Append a final null to string */ - if (!BUF_MEM_grow_clean(&buf, len + 1)) - { - ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, - ERR_R_MALLOC_FAILURE); - return 0; - } - buf.data[len] = 0; - cont = (const unsigned char *)buf.data; - free_cont = 1; - } - else - { - cont = p; - len = plen; - p += plen; - } - - /* We now have content length and type: translate into a structure */ - if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) - goto err; - - *in = p; - ret = 1; - err: - if (free_cont && buf.data) OPENSSL_free(buf.data); - return ret; - } + const unsigned char **in, long inlen, + const ASN1_ITEM *it, + int tag, int aclass, char opt, ASN1_TLC *ctx) +{ + int ret = 0, utype; + long plen; + char cst, inf, free_cont = 0; + const unsigned char *p; + BUF_MEM buf; + const unsigned char *cont = NULL; + long len; + if (!pval) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL); + return 0; /* Should never happen */ + } + + if (it->itype == ASN1_ITYPE_MSTRING) { + utype = tag; + tag = -1; + } else + utype = it->utype; + + if (utype == V_ASN1_ANY) { + /* If type is ANY need to figure out type from tag */ + unsigned char oclass; + if (tag >= 0) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY); + return 0; + } + if (opt) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, + ASN1_R_ILLEGAL_OPTIONAL_ANY); + return 0; + } + p = *in; + ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, + &p, inlen, -1, 0, 0, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); + return 0; + } + if (oclass != V_ASN1_UNIVERSAL) + utype = V_ASN1_OTHER; + } + if (tag == -1) { + tag = utype; + aclass = V_ASN1_UNIVERSAL; + } + p = *in; + /* Check header */ + ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, + &p, inlen, tag, aclass, opt, ctx); + if (!ret) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR); + return 0; + } else if (ret == -1) + return -1; + ret = 0; + /* SEQUENCE, SET and "OTHER" are left in encoded form */ + if ((utype == V_ASN1_SEQUENCE) + || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) { + /* + * Clear context cache for type OTHER because the auto clear when we + * have a exact match wont work + */ + if (utype == V_ASN1_OTHER) { + asn1_tlc_clear(ctx); + } + /* SEQUENCE and SET must be constructed */ + else if (!cst) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, + ASN1_R_TYPE_NOT_CONSTRUCTED); + return 0; + } + + cont = *in; + /* If indefinite length constructed find the real end */ + if (inf) { + if (!asn1_find_end(&p, plen, inf)) + goto err; + len = p - cont; + } else { + len = p - cont + plen; + p += plen; + buf.data = NULL; + } + } else if (cst) { + if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN + || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER + || utype == V_ASN1_ENUMERATED) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE); + return 0; + } + buf.length = 0; + buf.max = 0; + buf.data = NULL; + /* + * Should really check the internal tags are correct but some things + * may get this wrong. The relevant specs say that constructed string + * types should be OCTET STRINGs internally irrespective of the type. + * So instead just check for UNIVERSAL class and ignore the tag. + */ + if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) { + free_cont = 1; + goto err; + } + len = buf.length; + /* Append a final null to string */ + if (!BUF_MEM_grow_clean(&buf, len + 1)) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE); + return 0; + } + buf.data[len] = 0; + cont = (const unsigned char *)buf.data; + free_cont = 1; + } else { + cont = p; + len = plen; + p += plen; + } + + /* We now have content length and type: translate into a structure */ + if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) + goto err; + + *in = p; + ret = 1; + err: + if (free_cont && buf.data) + OPENSSL_free(buf.data); + return ret; +} /* Translate ASN1 content octets into a structure */ int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, - int utype, char *free_cont, const ASN1_ITEM *it) - { - ASN1_VALUE **opval = NULL; - ASN1_STRING *stmp; - ASN1_TYPE *typ = NULL; - int ret = 0; - const ASN1_PRIMITIVE_FUNCS *pf; - ASN1_INTEGER **tint; - pf = it->funcs; - - if (pf && pf->prim_c2i) - return pf->prim_c2i(pval, cont, len, utype, free_cont, it); - /* If ANY type clear type and set pointer to internal value */ - if (it->utype == V_ASN1_ANY) - { - if (!*pval) - { - typ = ASN1_TYPE_new(); - if (typ == NULL) - goto err; - *pval = (ASN1_VALUE *)typ; - } - else - typ = (ASN1_TYPE *)*pval; - - if (utype != typ->type) - ASN1_TYPE_set(typ, utype, NULL); - opval = pval; - pval = &typ->value.asn1_value; - } - switch(utype) - { - case V_ASN1_OBJECT: - if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) - goto err; - break; - - case V_ASN1_NULL: - if (len) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ASN1_R_NULL_IS_WRONG_LENGTH); - goto err; - } - *pval = (ASN1_VALUE *)1; - break; - - case V_ASN1_BOOLEAN: - if (len != 1) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ASN1_R_BOOLEAN_IS_WRONG_LENGTH); - goto err; - } - else - { - ASN1_BOOLEAN *tbool; - tbool = (ASN1_BOOLEAN *)pval; - *tbool = *cont; - } - break; - - case V_ASN1_BIT_STRING: - if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) - goto err; - break; - - case V_ASN1_INTEGER: - case V_ASN1_NEG_INTEGER: - case V_ASN1_ENUMERATED: - case V_ASN1_NEG_ENUMERATED: - tint = (ASN1_INTEGER **)pval; - if (!c2i_ASN1_INTEGER(tint, &cont, len)) - goto err; - /* Fixup type to match the expected form */ - (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG); - break; - - case V_ASN1_OCTET_STRING: - case V_ASN1_NUMERICSTRING: - case V_ASN1_PRINTABLESTRING: - case V_ASN1_T61STRING: - case V_ASN1_VIDEOTEXSTRING: - case V_ASN1_IA5STRING: - case V_ASN1_UTCTIME: - case V_ASN1_GENERALIZEDTIME: - case V_ASN1_GRAPHICSTRING: - case V_ASN1_VISIBLESTRING: - case V_ASN1_GENERALSTRING: - case V_ASN1_UNIVERSALSTRING: - case V_ASN1_BMPSTRING: - case V_ASN1_UTF8STRING: - case V_ASN1_OTHER: - case V_ASN1_SET: - case V_ASN1_SEQUENCE: - default: - if (utype == V_ASN1_BMPSTRING && (len & 1)) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ASN1_R_BMPSTRING_IS_WRONG_LENGTH); - goto err; - } - if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH); - goto err; - } - /* All based on ASN1_STRING and handled the same */ - if (!*pval) - { - stmp = ASN1_STRING_type_new(utype); - if (!stmp) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ERR_R_MALLOC_FAILURE); - goto err; - } - *pval = (ASN1_VALUE *)stmp; - } - else - { - stmp = (ASN1_STRING *)*pval; - stmp->type = utype; - } - /* If we've already allocated a buffer use it */ - if (*free_cont) - { - if (stmp->data) - OPENSSL_free(stmp->data); - stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */ - stmp->length = len; - *free_cont = 0; - } - else - { - if (!ASN1_STRING_set(stmp, cont, len)) - { - ASN1err(ASN1_F_ASN1_EX_C2I, - ERR_R_MALLOC_FAILURE); - ASN1_STRING_free(stmp); - *pval = NULL; - goto err; - } - } - break; - } - /* If ASN1_ANY and NULL type fix up value */ - if (typ && (utype == V_ASN1_NULL)) - typ->value.ptr = NULL; - - ret = 1; - err: - if (!ret) - { - ASN1_TYPE_free(typ); - if (opval) - *opval = NULL; - } - return ret; - } - - -/* This function finds the end of an ASN1 structure when passed its maximum - * length, whether it is indefinite length and a pointer to the content. - * This is more efficient than calling asn1_collect because it does not - * recurse on each indefinite length header. + int utype, char *free_cont, const ASN1_ITEM *it) +{ + ASN1_VALUE **opval = NULL; + ASN1_STRING *stmp; + ASN1_TYPE *typ = NULL; + int ret = 0; + const ASN1_PRIMITIVE_FUNCS *pf; + ASN1_INTEGER **tint; + pf = it->funcs; + + if (pf && pf->prim_c2i) + return pf->prim_c2i(pval, cont, len, utype, free_cont, it); + /* If ANY type clear type and set pointer to internal value */ + if (it->utype == V_ASN1_ANY) { + if (!*pval) { + typ = ASN1_TYPE_new(); + if (typ == NULL) + goto err; + *pval = (ASN1_VALUE *)typ; + } else + typ = (ASN1_TYPE *)*pval; + + if (utype != typ->type) + ASN1_TYPE_set(typ, utype, NULL); + opval = pval; + pval = &typ->value.asn1_value; + } + switch (utype) { + case V_ASN1_OBJECT: + if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) + goto err; + break; + + case V_ASN1_NULL: + if (len) { + ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH); + goto err; + } + *pval = (ASN1_VALUE *)1; + break; + + case V_ASN1_BOOLEAN: + if (len != 1) { + ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH); + goto err; + } else { + ASN1_BOOLEAN *tbool; + tbool = (ASN1_BOOLEAN *)pval; + *tbool = *cont; + } + break; + + case V_ASN1_BIT_STRING: + if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) + goto err; + break; + + case V_ASN1_INTEGER: + case V_ASN1_NEG_INTEGER: + case V_ASN1_ENUMERATED: + case V_ASN1_NEG_ENUMERATED: + tint = (ASN1_INTEGER **)pval; + if (!c2i_ASN1_INTEGER(tint, &cont, len)) + goto err; + /* Fixup type to match the expected form */ + (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG); + break; + + case V_ASN1_OCTET_STRING: + case V_ASN1_NUMERICSTRING: + case V_ASN1_PRINTABLESTRING: + case V_ASN1_T61STRING: + case V_ASN1_VIDEOTEXSTRING: + case V_ASN1_IA5STRING: + case V_ASN1_UTCTIME: + case V_ASN1_GENERALIZEDTIME: + case V_ASN1_GRAPHICSTRING: + case V_ASN1_VISIBLESTRING: + case V_ASN1_GENERALSTRING: + case V_ASN1_UNIVERSALSTRING: + case V_ASN1_BMPSTRING: + case V_ASN1_UTF8STRING: + case V_ASN1_OTHER: + case V_ASN1_SET: + case V_ASN1_SEQUENCE: + default: + if (utype == V_ASN1_BMPSTRING && (len & 1)) { + ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH); + goto err; + } + if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) { + ASN1err(ASN1_F_ASN1_EX_C2I, + ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH); + goto err; + } + /* All based on ASN1_STRING and handled the same */ + if (!*pval) { + stmp = ASN1_STRING_type_new(utype); + if (!stmp) { + ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE); + goto err; + } + *pval = (ASN1_VALUE *)stmp; + } else { + stmp = (ASN1_STRING *)*pval; + stmp->type = utype; + } + /* If we've already allocated a buffer use it */ + if (*free_cont) { + if (stmp->data) + OPENSSL_free(stmp->data); + stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */ + stmp->length = len; + *free_cont = 0; + } else { + if (!ASN1_STRING_set(stmp, cont, len)) { + ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE); + ASN1_STRING_free(stmp); + *pval = NULL; + goto err; + } + } + break; + } + /* If ASN1_ANY and NULL type fix up value */ + if (typ && (utype == V_ASN1_NULL)) + typ->value.ptr = NULL; + + ret = 1; + err: + if (!ret) { + ASN1_TYPE_free(typ); + if (opval) + *opval = NULL; + } + return ret; +} + +/* + * This function finds the end of an ASN1 structure when passed its maximum + * length, whether it is indefinite length and a pointer to the content. This + * is more efficient than calling asn1_collect because it does not recurse on + * each indefinite length header. */ static int asn1_find_end(const unsigned char **in, long len, char inf) - { - int expected_eoc; - long plen; - const unsigned char *p = *in, *q; - /* If not indefinite length constructed just add length */ - if (inf == 0) - { - *in += len; - return 1; - } - expected_eoc = 1; - /* Indefinite length constructed form. Find the end when enough EOCs - * are found. If more indefinite length constructed headers - * are encountered increment the expected eoc count otherwise just - * skip to the end of the data. - */ - while (len > 0) - { - if(asn1_check_eoc(&p, len)) - { - expected_eoc--; - if (expected_eoc == 0) - break; - len -= 2; - continue; - } - q = p; - /* Just read in a header: only care about the length */ - if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len, - -1, 0, 0, NULL)) - { - ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR); - return 0; - } - if (inf) - expected_eoc++; - else - p += plen; - len -= p - q; - } - if (expected_eoc) - { - ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC); - return 0; - } - *in = p; - return 1; - } -/* This function collects the asn1 data from a constructred string - * type into a buffer. The values of 'in' and 'len' should refer - * to the contents of the constructed type and 'inf' should be set - * if it is indefinite length. +{ + int expected_eoc; + long plen; + const unsigned char *p = *in, *q; + /* If not indefinite length constructed just add length */ + if (inf == 0) { + *in += len; + return 1; + } + expected_eoc = 1; + /* + * Indefinite length constructed form. Find the end when enough EOCs are + * found. If more indefinite length constructed headers are encountered + * increment the expected eoc count otherwise just skip to the end of the + * data. + */ + while (len > 0) { + if (asn1_check_eoc(&p, len)) { + expected_eoc--; + if (expected_eoc == 0) + break; + len -= 2; + continue; + } + q = p; + /* Just read in a header: only care about the length */ + if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len, + -1, 0, 0, NULL)) { + ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR); + return 0; + } + if (inf) + expected_eoc++; + else + p += plen; + len -= p - q; + } + if (expected_eoc) { + ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC); + return 0; + } + *in = p; + return 1; +} + +/* + * This function collects the asn1 data from a constructred string type into + * a buffer. The values of 'in' and 'len' should refer to the contents of the + * constructed type and 'inf' should be set if it is indefinite length. */ #ifndef ASN1_MAX_STRING_NEST -/* This determines how many levels of recursion are permitted in ASN1 - * string types. If it is not limited stack overflows can occur. If set - * to zero no recursion is allowed at all. Although zero should be adequate - * examples exist that require a value of 1. So 5 should be more than enough. +/* + * This determines how many levels of recursion are permitted in ASN1 string + * types. If it is not limited stack overflows can occur. If set to zero no + * recursion is allowed at all. Although zero should be adequate examples + * exist that require a value of 1. So 5 should be more than enough. */ -#define ASN1_MAX_STRING_NEST 5 +# define ASN1_MAX_STRING_NEST 5 #endif - static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, - char inf, int tag, int aclass, int depth) - { - const unsigned char *p, *q; - long plen; - char cst, ininf; - p = *in; - inf &= 1; - /* If no buffer and not indefinite length constructed just pass over - * the encoded data */ - if (!buf && !inf) - { - *in += len; - return 1; - } - while(len > 0) - { - q = p; - /* Check for EOC */ - if (asn1_check_eoc(&p, len)) - { - /* EOC is illegal outside indefinite length - * constructed form */ - if (!inf) - { - ASN1err(ASN1_F_ASN1_COLLECT, - ASN1_R_UNEXPECTED_EOC); - return 0; - } - inf = 0; - break; - } - - if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, - len, tag, aclass, 0, NULL)) - { - ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR); - return 0; - } - - /* If indefinite length constructed update max length */ - if (cst) - { - if (depth >= ASN1_MAX_STRING_NEST) - { - ASN1err(ASN1_F_ASN1_COLLECT, - ASN1_R_NESTED_ASN1_STRING); - return 0; - } - if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, - depth + 1)) - return 0; - } - else if (plen && !collect_data(buf, &p, plen)) - return 0; - len -= p - q; - } - if (inf) - { - ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC); - return 0; - } - *in = p; - return 1; - } + char inf, int tag, int aclass, int depth) +{ + const unsigned char *p, *q; + long plen; + char cst, ininf; + p = *in; + inf &= 1; + /* + * If no buffer and not indefinite length constructed just pass over the + * encoded data + */ + if (!buf && !inf) { + *in += len; + return 1; + } + while (len > 0) { + q = p; + /* Check for EOC */ + if (asn1_check_eoc(&p, len)) { + /* + * EOC is illegal outside indefinite length constructed form + */ + if (!inf) { + ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC); + return 0; + } + inf = 0; + break; + } + + if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, + len, tag, aclass, 0, NULL)) { + ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR); + return 0; + } + + /* If indefinite length constructed update max length */ + if (cst) { + if (depth >= ASN1_MAX_STRING_NEST) { + ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING); + return 0; + } + if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1)) + return 0; + } else if (plen && !collect_data(buf, &p, plen)) + return 0; + len -= p - q; + } + if (inf) { + ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC); + return 0; + } + *in = p; + return 1; +} static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen) - { - int len; - if (buf) - { - len = buf->length; - if (!BUF_MEM_grow_clean(buf, len + plen)) - { - ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE); - return 0; - } - memcpy(buf->data + len, *p, plen); - } - *p += plen; - return 1; - } +{ + int len; + if (buf) { + len = buf->length; + if (!BUF_MEM_grow_clean(buf, len + plen)) { + ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE); + return 0; + } + memcpy(buf->data + len, *p, plen); + } + *p += plen; + return 1; +} /* Check for ASN1 EOC and swallow it if found */ static int asn1_check_eoc(const unsigned char **in, long len) - { - const unsigned char *p; - if (len < 2) return 0; - p = *in; - if (!p[0] && !p[1]) - { - *in += 2; - return 1; - } - return 0; - } - -/* Check an ASN1 tag and length: a bit like ASN1_get_object - * but it sets the length for indefinite length constructed - * form, we don't know the exact length but we can set an - * upper bound to the amount of data available minus the - * header length just read. +{ + const unsigned char *p; + if (len < 2) + return 0; + p = *in; + if (!p[0] && !p[1]) { + *in += 2; + return 1; + } + return 0; +} + +/* + * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the + * length for indefinite length constructed form, we don't know the exact + * length but we can set an upper bound to the amount of data available minus + * the header length just read. */ 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) - { - int i; - int ptag, pclass; - long plen; - const unsigned char *p, *q; - p = *in; - q = p; - - if (ctx && ctx->valid) - { - i = ctx->ret; - plen = ctx->plen; - pclass = ctx->pclass; - ptag = ctx->ptag; - p += ctx->hdrlen; - } - else - { - i = ASN1_get_object(&p, &plen, &ptag, &pclass, len); - if (ctx) - { - ctx->ret = i; - ctx->plen = plen; - ctx->pclass = pclass; - ctx->ptag = ptag; - ctx->hdrlen = p - q; - ctx->valid = 1; - /* If definite length, and no error, length + - * header can't exceed total amount of data available. - */ - if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) - { - ASN1err(ASN1_F_ASN1_CHECK_TLEN, - ASN1_R_TOO_LONG); - asn1_tlc_clear(ctx); - return 0; - } - } - } - - if (i & 0x80) - { - ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER); - asn1_tlc_clear(ctx); - return 0; - } - if (exptag >= 0) - { - if ((exptag != ptag) || (expclass != pclass)) - { - /* If type is OPTIONAL, not an error: - * indicate missing type. - */ - if (opt) return -1; - asn1_tlc_clear(ctx); - ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG); - return 0; - } - /* We have a tag and class match: - * assume we are going to do something with it */ - asn1_tlc_clear(ctx); - } - - if (i & 1) - plen = len - (p - q); - - if (inf) - *inf = i & 1; - - if (cst) - *cst = i & V_ASN1_CONSTRUCTED; - - if (olen) - *olen = plen; - - if (oclass) - *oclass = pclass; - - if (otag) - *otag = ptag; - - *in = p; - return 1; - } + char *inf, char *cst, + const unsigned char **in, long len, + int exptag, int expclass, char opt, ASN1_TLC *ctx) +{ + int i; + int ptag, pclass; + long plen; + const unsigned char *p, *q; + p = *in; + q = p; + + if (ctx && ctx->valid) { + i = ctx->ret; + plen = ctx->plen; + pclass = ctx->pclass; + ptag = ctx->ptag; + p += ctx->hdrlen; + } else { + i = ASN1_get_object(&p, &plen, &ptag, &pclass, len); + if (ctx) { + ctx->ret = i; + ctx->plen = plen; + ctx->pclass = pclass; + ctx->ptag = ptag; + ctx->hdrlen = p - q; + ctx->valid = 1; + /* + * If definite length, and no error, length + header can't exceed + * total amount of data available. + */ + if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) { + ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG); + asn1_tlc_clear(ctx); + return 0; + } + } + } + + if (i & 0x80) { + ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER); + asn1_tlc_clear(ctx); + return 0; + } + if (exptag >= 0) { + if ((exptag != ptag) || (expclass != pclass)) { + /* + * If type is OPTIONAL, not an error: indicate missing type. + */ + if (opt) + return -1; + asn1_tlc_clear(ctx); + ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG); + return 0; + } + /* + * We have a tag and class match: assume we are going to do something + * with it + */ + asn1_tlc_clear(ctx); + } + + if (i & 1) + plen = len - (p - q); + + if (inf) + *inf = i & 1; + + if (cst) + *cst = i & V_ASN1_CONSTRUCTED; + + if (olen) + *olen = plen; + + if (oclass) + *oclass = pclass; + + if (otag) + *otag = ptag; + + *in = p; + return 1; +} |