1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <gssapi/gssapi.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include "utils.h" 36 37 OM_uint32 38 gss_encapsulate_token(const gss_buffer_t input_token, gss_OID oid, 39 gss_buffer_t output_token) 40 { 41 unsigned char *p; 42 size_t len, inside_len; 43 size_t a, b; 44 int i; 45 46 _gss_buffer_zero(output_token); 47 48 /* 49 * First time around, we calculate the size, second time, we 50 * encode the token. 51 */ 52 p = NULL; 53 for (i = 0; i < 2; i++) { 54 len = 0; 55 56 /* 57 * Token starts with [APPLICATION 0] SEQUENCE. 58 */ 59 if (p) 60 *p++ = 0x60; 61 len++; 62 63 /* 64 * The length embedded in the token is the space 65 * needed for the encapsulated oid plus the length of 66 * the inner token. 67 */ 68 if (oid->length > 127) 69 return (GSS_S_DEFECTIVE_TOKEN); 70 71 inside_len = 2 + oid->length + input_token->length; 72 73 /* 74 * Figure out how to encode the length 75 */ 76 if (inside_len < 128) { 77 if (p) 78 *p++ = inside_len; 79 len++; 80 } else { 81 b = 1; 82 if (inside_len >= 0x100) 83 b++; 84 if (inside_len >= 0x10000) 85 b++; 86 if (inside_len >= 0x1000000) 87 b++; 88 if (p) 89 *p++ = b | 0x80; 90 len++; 91 a = inside_len << 8*(4 - b); 92 while (b) { 93 if (p) 94 *p++ = (a >> 24); 95 a <<= 8; 96 len++; 97 b--; 98 } 99 } 100 101 /* 102 * Encode the OID for the mechanism. Simplify life by 103 * assuming that the OID length is less than 128 bytes. 104 */ 105 if (p) 106 *p++ = 0x06; 107 len++; 108 if (p) 109 *p++ = oid->length; 110 len++; 111 if (p) { 112 memcpy(p, oid->elements, oid->length); 113 p += oid->length; 114 } 115 len += oid->length; 116 117 if (p) { 118 memcpy(p, input_token->value, input_token->length); 119 p += input_token->length; 120 } 121 len += input_token->length; 122 123 if (i == 0) { 124 output_token->length = len; 125 output_token->value = malloc(len); 126 if (!output_token->value) 127 return (GSS_S_DEFECTIVE_TOKEN); 128 p = output_token->value; 129 } 130 } 131 132 return (GSS_S_COMPLETE); 133 } 134