5a32a5c8e7
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@2389 ec53bebd-3082-4978-b11e-865c3cabbd6b
325 lines
7.4 KiB
C
325 lines
7.4 KiB
C
/*
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* Copyright (c) 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "der_locl.h"
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RCSID("$Id$");
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/*
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* All decoding functions take a pointer `p' to first position in
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* which to read, from the left, `len' which means the maximum
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* number of characters we are able to read and return an int
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* indicating how many actually got read, or <0 in case of errors.
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*/
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/*
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* All decoding functions take a pointer `p' to first position in
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* which to read, from the left, `len' which means the maximum number
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* of characters we are able to read and return the status as an int
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*/
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int
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der_get_int (unsigned char *p, size_t len, unsigned *ret, size_t *size)
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{
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unsigned val = 0;
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size_t oldlen = len;
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while (len--)
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val = val * 256 + *p++;
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*ret = val;
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*size = oldlen;
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return 0;
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}
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int
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der_get_length (unsigned char *p, size_t len, size_t *val, size_t *size)
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{
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size_t v;
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if (--len < 0)
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return ASN1_OVERRUN;
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v = *p++;
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if (v < 128) {
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*val = v;
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*size = 1;
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} else {
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int e;
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size_t l;
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unsigned tmp;
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v &= 0x7F;
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if (len < v)
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return ASN1_OVERRUN;
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e = der_get_int (p, v, &tmp, &l);
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if(e) return e;
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*val = tmp;
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*size = l + 1;
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}
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return 0;
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}
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int
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der_get_general_string (unsigned char *p, size_t len,
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general_string *str, size_t *size)
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{
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size_t l, slen;
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char *s;
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int e;
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e = der_get_length (p, len, &slen, &l);
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if (e) return e;
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p += l;
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len -= l;
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if (len < slen)
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return ASN1_OVERRUN;
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s = malloc (slen + 1);
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if (s == NULL)
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return ENOMEM;
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memcpy (s, p, slen);
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s[slen] = '\0';
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*str = s;
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*size = slen + l;
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return 0;
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}
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int
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der_get_octet_string (unsigned char *p, size_t len,
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octet_string *data, size_t *size)
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{
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size_t l, slen;
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int e;
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e = der_get_length (p, len, &slen, &l);
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if (e) return e;
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p += l;
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len -= l;
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if (len < slen)
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return ASN1_OVERRUN;
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data->length = slen;
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data->data = malloc(slen);
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if (data->data == NULL && data->length != 0)
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return ENOMEM;
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memcpy (data->data, p, slen);
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*size = slen + l;
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return 0;
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}
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int
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der_get_tag (unsigned char *p, size_t len, Der_class *class, Der_type *type,
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int *tag, size_t *size)
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{
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if (len < 1)
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return ASN1_OVERRUN;
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*class = ((*p) >> 6) & 0x03;
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*type = ((*p) >> 5) & 0x01;
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*tag = (*p) & 0x1F;
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*size = 1;
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return 0;
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}
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int
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der_match_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
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int tag, size_t *size)
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{
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size_t l;
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Der_class thisclass;
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Der_type thistype;
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int thistag;
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int e;
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e = der_get_tag (p, len, &thisclass, &thistype, &thistag, &l);
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if (e) return e;
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if (class != thisclass || type != thistype)
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return ASN1_BAD_ID;
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if(tag > thistag)
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return ASN1_MISPLACED_FIELD;
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if(tag < thistag)
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return ASN1_MISSING_FIELD;
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*size = l;
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return 0;
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}
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int
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der_match_tag_and_length (unsigned char *p, size_t len,
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Der_class class, Der_type type, int tag,
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size_t *length_ret, size_t *size)
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{
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size_t l, ret = 0;
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int e;
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e = der_match_tag (p, len, class, type, tag, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_length (p, len, length_ret, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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*size = ret;
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return 0;
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}
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int
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decode_integer (unsigned char *p, size_t len, unsigned *num, size_t *size)
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{
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size_t ret = 0;
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size_t l, reallen;
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int e;
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e = der_match_tag (p, len, UNIV, PRIM, UT_Integer, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_length (p, len, &reallen, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_int (p, reallen, num, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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*size = ret;
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return 0;
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}
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int
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decode_general_string (unsigned char *p, size_t len,
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general_string *str, size_t *size)
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{
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size_t ret = 0;
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size_t l;
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int e;
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e = der_match_tag (p, len, UNIV, PRIM, UT_GeneralString, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_general_string (p, len, str, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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*size = ret;
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return 0;
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}
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int
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decode_octet_string (unsigned char *p, size_t len,
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octet_string *k, size_t *size)
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{
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size_t ret = 0;
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size_t l;
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int e;
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e = der_match_tag (p, len, UNIV, PRIM, UT_OctetString, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_octet_string (p, len, k, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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*size = ret;
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return 0;
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}
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static void
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generalizedtime2time (char *s, time_t *t)
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{
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struct tm tm;
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sscanf (s, "%04d%02d%02d%02d%02d%02dZ",
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&tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
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&tm.tm_min, &tm.tm_sec);
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tm.tm_year -= 1900;
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tm.tm_mon -= 1;
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*t = timegm (&tm);
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}
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int
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decode_generalized_time (unsigned char *p, size_t len, time_t *t, size_t *size)
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{
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octet_string k;
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char *times;
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size_t ret = 0;
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size_t l;
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int e;
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e = der_match_tag (p, len, UNIV, PRIM, UT_GeneralizedTime, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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e = der_get_octet_string (p, len, &k, &l);
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if (e) return e;
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p += l;
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len -= l;
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ret += l;
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times = realloc(k.data, k.length + 1);
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if (times == NULL){
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free(k.data);
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return ENOMEM;
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}
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times[k.length] = 0;
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generalizedtime2time (times, t);
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free (times);
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*size = ret;
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return 0;
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}
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int
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fix_dce(size_t reallen, size_t *len)
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{
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if(reallen == 0)
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return 1;
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if(*len < reallen)
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return -1;
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*len = reallen;
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return 0;
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}
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