diff options
author | Dr. Stephen Henson <steve@openssl.org> | 2000-12-08 19:09:35 +0000 |
---|---|---|
committer | Dr. Stephen Henson <steve@openssl.org> | 2000-12-08 19:09:35 +0000 |
commit | 9d6b1ce6441c7cc6aed344f02d9f676ab5e04217 (patch) | |
tree | 7329435a21d3289cb3caad6d3d6c065f484373e1 /crypto/asn1/tasn_dec.c | |
parent | 66ebbb6a56bc1688fa37878e4feec985b0c260d7 (diff) |
Merge from the ASN1 branch of new ASN1 code
to main trunk.
Lets see if the makes it to openssl-cvs :-)
Diffstat (limited to 'crypto/asn1/tasn_dec.c')
-rw-r--r-- | crypto/asn1/tasn_dec.c | 910 |
1 files changed, 910 insertions, 0 deletions
diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c new file mode 100644 index 0000000000..0caa8f6bd3 --- /dev/null +++ b/crypto/asn1/tasn_dec.c @@ -0,0 +1,910 @@ +/* tasn_dec.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project 2000. + */ +/* ==================================================================== + * Copyright (c) 2000 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 <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/objects.h> +#include <openssl/buffer.h> +#include <openssl/err.h> + +static int asn1_check_eoc(unsigned char **in, long len); +static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass); +static int collect_data(BUF_MEM *buf, unsigned char **p, long plen); +static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst, + unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx); +static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx); +static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx); +static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len, + const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx); + +/* 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, 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, 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, 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; + unsigned char *p, *q, 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) + 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) { + p = *in; + imphack = *p; + *p = (*p & V_ASN1_CONSTRUCTED) | it->utype; + } + + ptmpval = cf->asn1_d2i(pval, in, len); + + if(tag != -1) *p = 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; + /* CHOICE type, try each possibility in turn */ + pchval = NULL; + p = *in; + for(i = 0, tt=it->templates; i < it->tcount; i++, tt++) { + /* We mark field as OPTIONAL so its absence + * can be recognised. + */ + ret = asn1_template_ex_d2i(&pchval, &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); + return 0; + } + /* Did we fall off the end without reading anything? */ + if(i == it->tcount) { + /* If OPTIONAL, this is OK */ + if(opt) return -1; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE); + return 0; + } + /* Otherwise we got a match, allocate structure and populate it */ + if(!*pval) { + if(!ASN1_item_ex_new(pval, it)) { + errtt = tt; + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR); + return 0; + } + } + pchptr = asn1_get_field_ptr(pval, tt); + *pchptr = pchval; + 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_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; + } else seq_nolen = seq_eoc; /* If indefinite we don't do a length check */ + if(!cst) { + ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED); + goto err; + } + + if(!*pval) { + if(!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 = 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. + */ + +int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx) +{ + int flags, aclass; + int ret; + long len; + 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_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_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, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx) +{ + int flags, aclass; + int ret; + 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_EX_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, tt->item); + } + } + + if(!*val) { + ASN1err(ASN1_F_ASN1_TEMPLATE_EX_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_D2I, ASN1_R_UNEXPECTED_EOC); + goto err; + } + len -= p - q; + sk_eoc = 0; + break; + } + skfield = NULL; + if(!ASN1_item_ex_d2i(&skfield, &p, len, tt->item, -1, 0, 0, ctx)) { + ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_NESTED_ASN1_ERROR); + goto err; + } + len -= p - q; + if(!sk_push((STACK *)*val, (char *)skfield)) { + ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE); + goto err; + } + } + if(sk_eoc) { + ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ASN1_R_MISSING_EOC); + goto err; + } + } else if(flags & ASN1_TFLG_IMPTAG) { + /* IMPLICIT tagging */ + ret = ASN1_item_ex_d2i(val, &p, len, tt->item, tt->tag, aclass, opt, ctx); + if(!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_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, tt->item, -1, 0, opt, ctx); + if(!ret) { + ASN1err(ASN1_F_ASN1_TEMPLATE_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, 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; + unsigned char *p; + BUF_MEM buf; + 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; + /* SEQUENCE, SET and "OTHER" are left in encoded form */ + if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) { + /* SEQUENCE and SET must be constructed */ + if((utype != V_ASN1_OTHER) && !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) { + asn1_collect(NULL, &p, plen, inf, -1, -1); + 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. + */ + asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL); + cont = (unsigned char *)buf.data; + len = buf.length; + 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, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it) +{ + ASN1_STRING *stmp; + ASN1_TYPE *typ = NULL; + int ret = 0; + const ASN1_PRIMITIVE_FUNCS *pf; + 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(); + *pval = (ASN1_VALUE *)typ; + } else typ = (ASN1_TYPE *)pval; + if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL); + 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_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH); + goto err; + } + *pval = (ASN1_VALUE *)1; + break; + + case V_ASN1_BOOLEAN: + if(len != 1) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, 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: + if(!c2i_ASN1_INTEGER((ASN1_INTEGER **)pval, &cont, len)) goto err; + 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_D2I_EX_PRIMITIVE, 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 = cont; + stmp->length = len; + *free_cont = 0; + } else { + if(!ASN1_STRING_set(stmp, cont, len)) { + ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, 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); + return ret; +} + +/* 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. If 'buf' is NULL then we just want + * to find the end of the current structure: useful for indefinite + * length constructed stuff. + */ + +static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass) +{ + 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(!asn1_collect(buf, &p, plen, ininf, tag, aclass)) return 0; + } else { + if(!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, unsigned char **p, long plen) +{ + int len; + if(buf) { + len = buf->length; + if(!BUF_MEM_grow(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(unsigned char **in, long len) +{ + 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, + unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx) +{ + int i; + int ptag, pclass; + long plen; + 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, length + header can't exceed total + * amount of data available. + */ + if(!(i & 1) && ((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, but 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, so 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; +} |