From 954c01728e0c7485b72c9a5d5737e5f6bd0cf0b9 Mon Sep 17 00:00:00 2001 From: Heimdal Import User Date: Mon, 11 Jul 2005 01:16:55 +0000 Subject: r8302: import mini HEIMDAL into the tree (This used to be commit 118be28a7aef233799956615a99d1a2a74dac175) --- source4/heimdal/lib/asn1/der_get.c | 533 +++++++++++++++++++++++++++++++++++++ 1 file changed, 533 insertions(+) create mode 100644 source4/heimdal/lib/asn1/der_get.c (limited to 'source4/heimdal/lib/asn1/der_get.c') 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 --- /dev/null +++ b/source4/heimdal/lib/asn1/der_get.c @@ -0,0 +1,533 @@ +/* + * 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 + +/* + * 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; +} -- cgit