Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * auth.c |
| 3 | * |
| 4 | * some bookkeeping functions for authentication functions |
| 5 | * |
| 6 | * David A. McGrew |
| 7 | * Cisco Systems, Inc. |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * |
| 12 | * Copyright (c) 2001-2006, Cisco Systems, Inc. |
| 13 | * All rights reserved. |
| 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions |
| 17 | * are met: |
| 18 | * |
| 19 | * Redistributions of source code must retain the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer. |
| 21 | * |
| 22 | * Redistributions in binary form must reproduce the above |
| 23 | * copyright notice, this list of conditions and the following |
| 24 | * disclaimer in the documentation and/or other materials provided |
| 25 | * with the distribution. |
| 26 | * |
| 27 | * Neither the name of the Cisco Systems, Inc. nor the names of its |
| 28 | * contributors may be used to endorse or promote products derived |
| 29 | * from this software without specific prior written permission. |
| 30 | * |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 34 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 35 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 36 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 37 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 38 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 41 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 42 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 43 | * |
| 44 | */ |
| 45 | |
| 46 | #include "auth.h" |
| 47 | |
| 48 | /* the debug module for authentiation */ |
| 49 | |
| 50 | debug_module_t mod_auth = { |
| 51 | 0, /* debugging is off by default */ |
| 52 | "auth func" /* printable name for module */ |
| 53 | }; |
| 54 | |
| 55 | |
| 56 | int |
| 57 | auth_get_key_length(const auth_t *a) { |
| 58 | return a->key_len; |
| 59 | } |
| 60 | |
| 61 | int |
| 62 | auth_get_tag_length(const auth_t *a) { |
| 63 | return a->out_len; |
| 64 | } |
| 65 | |
| 66 | int |
| 67 | auth_get_prefix_length(const auth_t *a) { |
| 68 | return a->prefix_len; |
| 69 | } |
| 70 | |
| 71 | int |
| 72 | auth_type_get_ref_count(const auth_type_t *at) { |
| 73 | return at->ref_count; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * auth_type_self_test() tests an auth function of type ct against |
| 78 | * test cases provided in an array of values of key, data, and tag |
| 79 | * that is known to be good |
| 80 | */ |
| 81 | |
| 82 | /* should be big enough for most occasions */ |
| 83 | #define SELF_TEST_TAG_BUF_OCTETS 32 |
| 84 | |
| 85 | err_status_t |
| 86 | auth_type_self_test(const auth_type_t *at) { |
| 87 | auth_test_case_t *test_case = at->test_data; |
| 88 | auth_t *a; |
| 89 | err_status_t status; |
| 90 | uint8_t tag[SELF_TEST_TAG_BUF_OCTETS]; |
| 91 | int i, case_num = 0; |
| 92 | |
| 93 | debug_print(mod_auth, "running self-test for auth function %s", |
| 94 | at->description); |
| 95 | |
| 96 | /* |
| 97 | * check to make sure that we have at least one test case, and |
| 98 | * return an error if we don't - we need to be paranoid here |
| 99 | */ |
| 100 | if (test_case == NULL) |
| 101 | return err_status_cant_check; |
| 102 | |
| 103 | /* loop over all test cases */ |
| 104 | while (test_case != NULL) { |
| 105 | |
| 106 | /* check test case parameters */ |
| 107 | if (test_case->tag_length_octets > SELF_TEST_TAG_BUF_OCTETS) |
| 108 | return err_status_bad_param; |
| 109 | |
| 110 | /* allocate auth */ |
| 111 | status = auth_type_alloc(at, &a, test_case->key_length_octets, |
| 112 | test_case->tag_length_octets); |
| 113 | if (status) |
| 114 | return status; |
| 115 | |
| 116 | /* initialize auth */ |
| 117 | status = auth_init(a, test_case->key); |
| 118 | if (status) { |
| 119 | auth_dealloc(a); |
| 120 | return status; |
| 121 | } |
| 122 | |
| 123 | /* zeroize tag then compute */ |
| 124 | octet_string_set_to_zero(tag, test_case->tag_length_octets); |
| 125 | status = auth_compute(a, test_case->data, |
| 126 | test_case->data_length_octets, tag); |
| 127 | if (status) { |
| 128 | auth_dealloc(a); |
| 129 | return status; |
| 130 | } |
| 131 | |
| 132 | debug_print(mod_auth, "key: %s", |
| 133 | octet_string_hex_string(test_case->key, |
| 134 | test_case->key_length_octets)); |
| 135 | debug_print(mod_auth, "data: %s", |
| 136 | octet_string_hex_string(test_case->data, |
| 137 | test_case->data_length_octets)); |
| 138 | debug_print(mod_auth, "tag computed: %s", |
| 139 | octet_string_hex_string(tag, test_case->tag_length_octets)); |
| 140 | debug_print(mod_auth, "tag expected: %s", |
| 141 | octet_string_hex_string(test_case->tag, |
| 142 | test_case->tag_length_octets)); |
| 143 | |
| 144 | /* check the result */ |
| 145 | status = err_status_ok; |
| 146 | for (i=0; i < test_case->tag_length_octets; i++) |
| 147 | if (tag[i] != test_case->tag[i]) { |
| 148 | status = err_status_algo_fail; |
| 149 | debug_print(mod_auth, "test case %d failed", case_num); |
| 150 | debug_print(mod_auth, " (mismatch at octet %d)", i); |
| 151 | } |
| 152 | if (status) { |
| 153 | auth_dealloc(a); |
| 154 | return err_status_algo_fail; |
| 155 | } |
| 156 | |
| 157 | /* deallocate the auth function */ |
| 158 | status = auth_dealloc(a); |
| 159 | if (status) |
| 160 | return status; |
| 161 | |
| 162 | /* |
| 163 | * the auth function passed the test case, so move on to the next test |
| 164 | * case in the list; if NULL, we'll quit and return an OK |
| 165 | */ |
| 166 | test_case = test_case->next_test_case; |
| 167 | ++case_num; |
| 168 | } |
| 169 | |
| 170 | return err_status_ok; |
| 171 | } |
| 172 | |
| 173 | |