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546 lines
15 KiB
C
546 lines
15 KiB
C
/*
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* Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation
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*
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* Author: Nikos Mavrogiannopoulos
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*
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* This file is part of GNUTLS.
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*
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* The GNUTLS library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA
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*
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*/
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#include <gnutls_int.h>
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#include <libtasn1.h>
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#include <gnutls_datum.h>
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#include <gnutls_global.h>
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#include <gnutls_errors.h>
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#include <gnutls_str.h>
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#include <common.h>
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#include <gnutls_num.h>
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#include <dn.h>
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/* This file includes all the required to parse an X.509 Distriguished
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* Name (you need a parser just to read a name in the X.509 protoocols!!!)
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*/
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/* Converts the given OID to an ldap acceptable string or
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* a dotted OID.
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*/
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static const char *
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oid2ldap_string (const char *oid)
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{
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const char *ret;
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ret = MHD__gnutls_x509_oid2ldap_string (oid);
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if (ret)
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return ret;
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/* else return the OID in dotted format */
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return oid;
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}
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/* Escapes a string following the rules from RFC2253.
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*/
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static char *
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str_escape (char *str, char *buffer, unsigned int buffer_size)
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{
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int str_length, j, i;
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if (str == NULL || buffer == NULL)
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return NULL;
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str_length = MIN (strlen (str), buffer_size - 1);
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for (i = j = 0; i < str_length; i++)
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{
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if (str[i] == ',' || str[i] == '+' || str[i] == '"'
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|| str[i] == '\\' || str[i] == '<' || str[i] == '>'
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|| str[i] == ';')
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buffer[j++] = '\\';
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buffer[j++] = str[i];
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}
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/* null terminate the string */
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buffer[j] = 0;
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return buffer;
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}
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/* Parses an X509 DN in the MHD__asn1_struct, and puts the output into
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* the string buf. The output is an LDAP encoded DN.
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*
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* MHD__asn1_rdn_name must be a string in the form "tbsCertificate.issuer.rdnSequence".
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* That is to point in the rndSequence.
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*/
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int
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MHD__gnutls_x509_parse_dn (ASN1_TYPE MHD__asn1_struct,
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const char *MHD__asn1_rdn_name, char *buf,
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size_t * sizeof_buf)
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{
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MHD_gtls_string out_str;
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int k2, k1, result;
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char tmpbuffer1[MAX_NAME_SIZE];
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char tmpbuffer2[MAX_NAME_SIZE];
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char tmpbuffer3[MAX_NAME_SIZE];
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opaque value[MAX_STRING_LEN], *value2 = NULL;
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char *escaped = NULL;
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const char *ldap_desc;
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char oid[128];
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int len, printable;
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char *string = NULL;
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size_t sizeof_string, sizeof_escaped;
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if (sizeof_buf == NULL)
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{
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MHD_gnutls_assert ();
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return GNUTLS_E_INVALID_REQUEST;
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}
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if (*sizeof_buf > 0 && buf)
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buf[0] = 0;
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else
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*sizeof_buf = 0;
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MHD_gtls_string_init (&out_str, MHD_gnutls_malloc, MHD_gnutls_realloc,
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MHD_gnutls_free);
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k1 = 0;
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do
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{
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k1++;
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/* create a string like "tbsCertList.issuer.rdnSequence.?1"
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*/
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if (MHD__asn1_rdn_name[0] != 0)
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snprintf (tmpbuffer1, sizeof (tmpbuffer1), "%s.?%u",
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MHD__asn1_rdn_name, k1);
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else
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snprintf (tmpbuffer1, sizeof (tmpbuffer1), "?%u", k1);
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len = sizeof (value) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer1, value, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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{
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break;
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}
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if (result != ASN1_VALUE_NOT_FOUND)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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k2 = 0;
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do
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{ /* Move to the attibute type and values
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*/
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k2++;
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if (tmpbuffer1[0] != 0)
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snprintf (tmpbuffer2, sizeof (tmpbuffer2), "%s.?%u", tmpbuffer1,
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k2);
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else
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snprintf (tmpbuffer2, sizeof (tmpbuffer2), "?%u", k2);
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/* Try to read the RelativeDistinguishedName attributes.
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*/
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len = sizeof (value) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer2, value, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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break;
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if (result != ASN1_VALUE_NOT_FOUND)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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/* Read the OID
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*/
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MHD_gtls_str_cpy (tmpbuffer3, sizeof (tmpbuffer3), tmpbuffer2);
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MHD_gtls_str_cat (tmpbuffer3, sizeof (tmpbuffer3), ".type");
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len = sizeof (oid) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer3, oid, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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break;
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else if (result != ASN1_SUCCESS)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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/* Read the Value
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*/
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MHD_gtls_str_cpy (tmpbuffer3, sizeof (tmpbuffer3), tmpbuffer2);
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MHD_gtls_str_cat (tmpbuffer3, sizeof (tmpbuffer3), ".value");
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len = 0;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer3, NULL, &len);
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value2 = MHD_gnutls_malloc (len);
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if (value2 == NULL)
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{
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MHD_gnutls_assert ();
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result = GNUTLS_E_MEMORY_ERROR;
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goto cleanup;
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}
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer3, value2, &len);
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if (result != ASN1_SUCCESS)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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#define STR_APPEND(y) if ((result=MHD_gtls_string_append_str( &out_str, y)) < 0) { \
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MHD_gnutls_assert(); \
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goto cleanup; \
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}
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/* The encodings of adjoining RelativeDistinguishedNames are separated
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* by a comma character (',' ASCII 44).
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*/
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/* Where there is a multi-valued RDN, the outputs from adjoining
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* AttributeTypeAndValues are separated by a plus ('+' ASCII 43)
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* character.
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*/
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if (k1 != 1)
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{ /* the first time do not append a comma */
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if (k2 != 1)
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{ /* adjoining multi-value RDN */
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STR_APPEND ("+");
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}
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else
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{
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STR_APPEND (",");
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}
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}
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ldap_desc = oid2ldap_string (oid);
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printable = MHD__gnutls_x509_oid_data_printable (oid);
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sizeof_escaped = 2 * len + 1;
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escaped = MHD_gnutls_malloc (sizeof_escaped);
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if (escaped == NULL)
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{
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MHD_gnutls_assert ();
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result = GNUTLS_E_MEMORY_ERROR;
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goto cleanup;
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}
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sizeof_string = 2 * len + 2; /* in case it is not printable */
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string = MHD_gnutls_malloc (sizeof_string);
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if (string == NULL)
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{
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MHD_gnutls_assert ();
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result = GNUTLS_E_MEMORY_ERROR;
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goto cleanup;
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}
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STR_APPEND (ldap_desc);
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STR_APPEND ("=");
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result = 0;
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if (printable)
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result =
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MHD__gnutls_x509_oid_data2string (oid,
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value2, len,
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string, &sizeof_string);
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if (!printable || result < 0)
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result =
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MHD__gnutls_x509_data2hex ((const unsigned char *) value2, len,
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(unsigned char *) string,
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&sizeof_string);
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if (result < 0)
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{
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MHD_gnutls_assert ();
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MHD__gnutls_x509_log
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("Found OID: '%s' with value '%s'\n",
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oid, MHD_gtls_bin2hex (value2, len, escaped,
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sizeof_escaped));
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goto cleanup;
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}
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STR_APPEND (str_escape (string, escaped, sizeof_escaped));
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MHD_gnutls_free (string);
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string = NULL;
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MHD_gnutls_free (escaped);
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escaped = NULL;
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MHD_gnutls_free (value2);
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value2 = NULL;
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}
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while (1);
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}
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while (1);
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if (out_str.length >= (unsigned int) *sizeof_buf)
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{
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MHD_gnutls_assert ();
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*sizeof_buf = out_str.length + 1;
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result = GNUTLS_E_SHORT_MEMORY_BUFFER;
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goto cleanup;
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}
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if (buf)
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{
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memcpy (buf, out_str.data, out_str.length);
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buf[out_str.length] = 0;
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}
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*sizeof_buf = out_str.length;
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result = 0;
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cleanup:
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MHD_gnutls_free (value2);
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MHD_gnutls_free (string);
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MHD_gnutls_free (escaped);
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MHD_gtls_string_clear (&out_str);
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return result;
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}
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/* Parses an X509 DN in the MHD__asn1_struct, and searches for the
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* given OID in the DN.
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*
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* If raw_flag == 0, the output will be encoded in the LDAP way. (#hex for non printable)
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* Otherwise the raw DER data are returned.
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*
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* MHD__asn1_rdn_name must be a string in the form "tbsCertificate.issuer.rdnSequence".
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* That is to point in the rndSequence.
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*
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* indx specifies which OID to return. Ie 0 means return the first specified
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* OID found, 1 the second etc.
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*/
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int
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MHD__gnutls_x509_parse_dn_oid (ASN1_TYPE MHD__asn1_struct,
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const char *MHD__asn1_rdn_name,
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const char *given_oid, int indx,
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unsigned int raw_flag,
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void *buf, size_t * sizeof_buf)
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{
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int k2, k1, result;
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char tmpbuffer1[MAX_NAME_SIZE];
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char tmpbuffer2[MAX_NAME_SIZE];
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char tmpbuffer3[MAX_NAME_SIZE];
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opaque value[256];
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char oid[128];
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int len, printable;
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int i = 0;
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char *cbuf = buf;
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if (cbuf == NULL)
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*sizeof_buf = 0;
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else
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cbuf[0] = 0;
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k1 = 0;
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do
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{
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k1++;
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/* create a string like "tbsCertList.issuer.rdnSequence.?1"
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*/
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if (MHD__asn1_rdn_name[0] != 0)
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snprintf (tmpbuffer1, sizeof (tmpbuffer1), "%s.?%u",
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MHD__asn1_rdn_name, k1);
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else
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snprintf (tmpbuffer1, sizeof (tmpbuffer1), "?%u", k1);
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len = sizeof (value) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer1, value, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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{
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MHD_gnutls_assert ();
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break;
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}
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if (result != ASN1_VALUE_NOT_FOUND)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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k2 = 0;
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do
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{ /* Move to the attibute type and values
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*/
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k2++;
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if (tmpbuffer1[0] != 0)
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snprintf (tmpbuffer2, sizeof (tmpbuffer2), "%s.?%u", tmpbuffer1,
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k2);
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else
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snprintf (tmpbuffer2, sizeof (tmpbuffer2), "?%u", k2);
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/* Try to read the RelativeDistinguishedName attributes.
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*/
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len = sizeof (value) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer2, value, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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{
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break;
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}
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if (result != ASN1_VALUE_NOT_FOUND)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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/* Read the OID
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*/
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MHD_gtls_str_cpy (tmpbuffer3, sizeof (tmpbuffer3), tmpbuffer2);
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MHD_gtls_str_cat (tmpbuffer3, sizeof (tmpbuffer3), ".type");
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len = sizeof (oid) - 1;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer3, oid, &len);
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if (result == ASN1_ELEMENT_NOT_FOUND)
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break;
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else if (result != ASN1_SUCCESS)
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{
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MHD_gnutls_assert ();
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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if (strcmp (oid, given_oid) == 0 && indx == i++)
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{ /* Found the OID */
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/* Read the Value
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*/
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MHD_gtls_str_cpy (tmpbuffer3, sizeof (tmpbuffer3), tmpbuffer2);
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MHD_gtls_str_cat (tmpbuffer3, sizeof (tmpbuffer3), ".value");
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len = *sizeof_buf;
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result =
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MHD__asn1_read_value (MHD__asn1_struct, tmpbuffer3, buf,
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&len);
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if (result != ASN1_SUCCESS)
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{
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MHD_gnutls_assert ();
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if (result == ASN1_MEM_ERROR)
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*sizeof_buf = len;
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result = MHD_gtls_asn2err (result);
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goto cleanup;
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}
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if (raw_flag != 0)
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{
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if ((unsigned) len > *sizeof_buf)
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{
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*sizeof_buf = len;
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result = GNUTLS_E_SHORT_MEMORY_BUFFER;
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goto cleanup;
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}
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*sizeof_buf = len;
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return 0;
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}
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else
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{ /* parse data. raw_flag == 0 */
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printable = MHD__gnutls_x509_oid_data_printable (oid);
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if (printable == 1)
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result =
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MHD__gnutls_x509_oid_data2string (oid, buf, len,
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cbuf, sizeof_buf);
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else
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result =
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MHD__gnutls_x509_data2hex (buf, len,
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(unsigned char *) cbuf,
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sizeof_buf);
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if (result < 0)
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{
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MHD_gnutls_assert ();
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goto cleanup;
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}
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return 0;
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} /* raw_flag == 0 */
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}
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}
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while (1);
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}
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while (1);
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MHD_gnutls_assert ();
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result = GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
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cleanup:
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return result;
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}
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/*
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* Compares the DER encoded part of a DN.
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*
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* FIXME: use a real DN comparison algorithm.
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*
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* Returns 1 if the DN's match and zero if they don't match. Otherwise
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* a negative value is returned to indicate error.
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*/
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int
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MHD__gnutls_x509_compare_raw_dn (const MHD_gnutls_datum_t * dn1,
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const MHD_gnutls_datum_t * dn2)
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{
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if (dn1->size != dn2->size)
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{
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MHD_gnutls_assert ();
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return 0;
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}
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if (memcmp (dn1->data, dn2->data, dn2->size) != 0)
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{
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MHD_gnutls_assert ();
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return 0;
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}
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return 1; /* they match */
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}
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