diff options
Diffstat (limited to 'crypto/asn1/tasn_dec.c')
| -rw-r--r-- | crypto/asn1/tasn_dec.c | 1322 |
1 files changed, 1322 insertions, 0 deletions
diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c new file mode 100644 index 000000000000..66d229b08b39 --- /dev/null +++ b/crypto/asn1/tasn_dec.c @@ -0,0 +1,1322 @@ +/* tasn_dec.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project 2000. + */ +/* ==================================================================== + * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * 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 + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + + +#include <stddef.h> +#include <string.h> +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/objects.h> +#include <openssl/buffer.h> +#include <openssl/err.h> + +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); + +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); + +static int asn1_template_ex_d2i(ASN1_VALUE **pval, + 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); +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); + +/* 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 */ + }; + +unsigned long ASN1_tag2bit(int 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 + +/* 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(&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(&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 *pchval, **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)) + 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 */ + pchval = NULL; + 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)) + 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)) + 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)) + 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); + *val = NULL; + 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 *sktmp = (STACK *)*val; + ASN1_VALUE *vtmp; + while(sk_num(sktmp) > 0) + { + vtmp = (ASN1_VALUE *)sk_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_push((STACK *)*val, (char *)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); + *val = NULL; + 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) + { + 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)) + { + 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 = (ASN1_VALUE **)&typ->value.ptr; + } + 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: + /* 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. + */ + +static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, + char inf, int tag, int aclass) + { + 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) + { +#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS + if (!asn1_collect(buf, &p, plen, ininf, tag, aclass)) + return 0; +#else + ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING); + return 0; +#endif + } + 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; + } + +/* 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. + */ + +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; + } |