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-rw-r--r--source4/heimdal/lib/asn1/der_get.c533
1 files changed, 533 insertions, 0 deletions
diff --git a/source4/heimdal/lib/asn1/der_get.c b/source4/heimdal/lib/asn1/der_get.c
new file mode 100644
index 0000000000..d33d3ca9ef
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+++ b/source4/heimdal/lib/asn1/der_get.c
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+/*
+ * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS 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 INSTITUTE OR 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.
+ */
+
+#include "der_locl.h"
+
+RCSID("$Id: der_get.c,v 1.39 2005/05/29 14:23:00 lha Exp $");
+
+#include <version.h>
+
+/*
+ * All decoding functions take a pointer `p' to first position in
+ * which to read, from the left, `len' which means the maximum number
+ * of characters we are able to read, `ret' were the value will be
+ * returned and `size' where the number of used bytes is stored.
+ * Either 0 or an error code is returned.
+ */
+
+static int
+der_get_unsigned (const unsigned char *p, size_t len,
+ unsigned *ret, size_t *size)
+{
+ unsigned val = 0;
+ size_t oldlen = len;
+
+ while (len--)
+ val = val * 256 + *p++;
+ *ret = val;
+ if(size) *size = oldlen;
+ return 0;
+}
+
+int
+der_get_int (const unsigned char *p, size_t len,
+ int *ret, size_t *size)
+{
+ int val = 0;
+ size_t oldlen = len;
+
+ if (len > 0) {
+ val = (signed char)*p++;
+ while (--len)
+ val = val * 256 + *p++;
+ }
+ *ret = val;
+ if(size) *size = oldlen;
+ return 0;
+}
+
+int
+der_get_boolean(const unsigned char *p, size_t len, int *data, size_t *size)
+{
+ if(len < 1)
+ return ASN1_OVERRUN;
+ if(*p != 0)
+ *data = 1;
+ else
+ *data = 0;
+ *size = 1;
+ return 0;
+}
+
+int
+der_get_length (const unsigned char *p, size_t len,
+ size_t *val, size_t *size)
+{
+ size_t v;
+
+ if (len <= 0)
+ return ASN1_OVERRUN;
+ --len;
+ v = *p++;
+ if (v < 128) {
+ *val = v;
+ if(size) *size = 1;
+ } else {
+ int e;
+ size_t l;
+ unsigned tmp;
+
+ if(v == 0x80){
+ *val = ASN1_INDEFINITE;
+ if(size) *size = 1;
+ return 0;
+ }
+ v &= 0x7F;
+ if (len < v)
+ return ASN1_OVERRUN;
+ e = der_get_unsigned (p, v, &tmp, &l);
+ if(e) return e;
+ *val = tmp;
+ if(size) *size = l + 1;
+ }
+ return 0;
+}
+
+int
+der_get_general_string (const unsigned char *p, size_t len,
+ heim_general_string *str, size_t *size)
+{
+ char *s;
+
+ s = malloc (len + 1);
+ if (s == NULL)
+ return ENOMEM;
+ memcpy (s, p, len);
+ s[len] = '\0';
+ *str = s;
+ if(size) *size = len;
+ return 0;
+}
+
+int
+der_get_octet_string (const unsigned char *p, size_t len,
+ heim_octet_string *data, size_t *size)
+{
+ data->length = len;
+ data->data = malloc(len);
+ if (data->data == NULL && data->length != 0)
+ return ENOMEM;
+ memcpy (data->data, p, len);
+ if(size) *size = len;
+ return 0;
+}
+
+int
+der_get_oid (const unsigned char *p, size_t len,
+ heim_oid *data, size_t *size)
+{
+ int n;
+ size_t oldlen = len;
+
+ if (len < 1)
+ return ASN1_OVERRUN;
+
+ data->components = malloc((len + 1) * sizeof(*data->components));
+ if (data->components == NULL)
+ return ENOMEM;
+ data->components[0] = (*p) / 40;
+ data->components[1] = (*p) % 40;
+ --len;
+ ++p;
+ for (n = 2; len > 0; ++n) {
+ unsigned u = 0;
+
+ do {
+ --len;
+ u = u * 128 + (*p++ % 128);
+ } while (len > 0 && p[-1] & 0x80);
+ data->components[n] = u;
+ }
+ if (len > 0 && p[-1] & 0x80) {
+ free_oid (data);
+ return ASN1_OVERRUN;
+ }
+ data->length = n;
+ if (size)
+ *size = oldlen;
+ return 0;
+}
+
+int
+der_get_tag (const unsigned char *p, size_t len,
+ Der_class *class, Der_type *type,
+ int *tag, size_t *size)
+{
+ if (len < 1)
+ return ASN1_OVERRUN;
+ *class = (Der_class)(((*p) >> 6) & 0x03);
+ *type = (Der_type)(((*p) >> 5) & 0x01);
+ *tag = (*p) & 0x1F;
+ if(size) *size = 1;
+ return 0;
+}
+
+int
+der_match_tag (const unsigned char *p, size_t len,
+ Der_class class, Der_type type,
+ int tag, size_t *size)
+{
+ size_t l;
+ Der_class thisclass;
+ Der_type thistype;
+ int thistag;
+ int e;
+
+ e = der_get_tag (p, len, &thisclass, &thistype, &thistag, &l);
+ if (e) return e;
+ if (class != thisclass || type != thistype)
+ return ASN1_BAD_ID;
+ if(tag > thistag)
+ return ASN1_MISPLACED_FIELD;
+ if(tag < thistag)
+ return ASN1_MISSING_FIELD;
+ if(size) *size = l;
+ return 0;
+}
+
+int
+der_match_tag_and_length (const unsigned char *p, size_t len,
+ Der_class class, Der_type type, int tag,
+ size_t *length_ret, size_t *size)
+{
+ size_t l, ret = 0;
+ int e;
+
+ e = der_match_tag (p, len, class, type, tag, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, length_ret, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_boolean (const unsigned char *p, size_t len,
+ int *num, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_Boolean, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (reallen > len)
+ return ASN1_OVERRUN;
+
+ e = der_get_boolean (p, reallen, num, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_integer (const unsigned char *p, size_t len,
+ int *num, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_Integer, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (reallen > len)
+ return ASN1_OVERRUN;
+
+ e = der_get_int (p, reallen, num, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_unsigned (const unsigned char *p, size_t len,
+ unsigned *num, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_Integer, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (reallen > len)
+ return ASN1_OVERRUN;
+
+ e = der_get_unsigned (p, reallen, num, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_enumerated (const unsigned char *p, size_t len,
+ unsigned *num, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_Enumerated, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (reallen > len)
+ return ASN1_OVERRUN;
+
+ e = der_get_int (p, reallen, num, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_general_string (const unsigned char *p, size_t len,
+ heim_general_string *str, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_GeneralString, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < reallen)
+ return ASN1_OVERRUN;
+
+ e = der_get_general_string (p, reallen, str, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_octet_string (const unsigned char *p, size_t len,
+ heim_octet_string *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_OctetString, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < reallen)
+ return ASN1_OVERRUN;
+
+ e = der_get_octet_string (p, reallen, k, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+int
+decode_oid (const unsigned char *p, size_t len,
+ heim_oid *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_OID, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < reallen)
+ return ASN1_OVERRUN;
+
+ e = der_get_oid (p, reallen, k, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if(size) *size = ret;
+ return 0;
+}
+
+static void
+generalizedtime2time (const char *s, time_t *t)
+{
+ struct tm tm;
+
+ memset(&tm, 0, sizeof(tm));
+ sscanf (s, "%04d%02d%02d%02d%02d%02dZ",
+ &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
+ &tm.tm_min, &tm.tm_sec);
+ tm.tm_year -= 1900;
+ tm.tm_mon -= 1;
+ *t = timegm (&tm);
+}
+
+int
+decode_generalized_time (const unsigned char *p, size_t len,
+ time_t *t, size_t *size)
+{
+ heim_octet_string k;
+ char *times;
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag (p, len, ASN1_C_UNIV, PRIM, UT_GeneralizedTime, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length (p, len, &reallen, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < reallen)
+ return ASN1_OVERRUN;
+
+ e = der_get_octet_string (p, reallen, &k, &l);
+ if (e) return e;
+ p += l;
+ len -= l;
+ ret += l;
+ times = realloc(k.data, k.length + 1);
+ if (times == NULL){
+ free(k.data);
+ return ENOMEM;
+ }
+ times[k.length] = 0;
+ generalizedtime2time (times, t);
+ free (times);
+ if(size) *size = ret;
+ return 0;
+}
+
+
+int
+fix_dce(size_t reallen, size_t *len)
+{
+ if(reallen == ASN1_INDEFINITE)
+ return 1;
+ if(*len < reallen)
+ return -1;
+ *len = reallen;
+ return 0;
+}
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