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108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*-
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* Copyright (c) 2008 Doug Rabson
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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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <gssapi/gssapi.h>
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#include <stdlib.h>
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#include <string.h>
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#include "utils.h"
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OM_uint32
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gss_decapsulate_token(const gss_buffer_t input_token, gss_OID oid,
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gss_buffer_t output_token)
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{
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unsigned char *p = input_token->value;
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size_t len = input_token->length;
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size_t a, b;
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gss_OID_desc mech_oid;
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_gss_buffer_zero(output_token);
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/*
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* Token must start with [APPLICATION 0] SEQUENCE.
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*/
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if (len == 0 || *p != 0x60)
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return (GSS_S_DEFECTIVE_TOKEN);
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p++;
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len--;
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/*
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* Decode the length and make sure it agrees with the
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* token length.
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*/
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if (len == 0)
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return (GSS_S_DEFECTIVE_TOKEN);
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if ((*p & 0x80) == 0) {
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a = *p;
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p++;
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len--;
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} else {
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b = *p & 0x7f;
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p++;
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len--;
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if (len < b)
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return (GSS_S_DEFECTIVE_TOKEN);
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a = 0;
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while (b) {
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a = (a << 8) | *p;
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p++;
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len--;
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b--;
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}
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}
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if (a != len)
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return (GSS_S_DEFECTIVE_TOKEN);
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/*
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* Decode the OID for the mechanism. Simplify life by
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* assuming that the OID length is less than 128 bytes.
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*/
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if (len < 2 || *p != 0x06)
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return (GSS_S_DEFECTIVE_TOKEN);
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if ((p[1] & 0x80) || p[1] > (len - 2))
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return (GSS_S_DEFECTIVE_TOKEN);
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mech_oid.length = p[1];
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p += 2;
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len -= 2;
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mech_oid.elements = p;
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if (!gss_oid_equal(&mech_oid, oid))
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return (GSS_S_FAILURE);
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p += mech_oid.length;
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len -= mech_oid.length;
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output_token->length = len;
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output_token->value = malloc(len);
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if (!output_token->value)
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return (GSS_S_DEFECTIVE_TOKEN);
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memcpy(output_token->value, p, len);
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return (GSS_S_COMPLETE);
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}
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