Line data Source code
1 : /*
2 : * Copyright (c) 2007 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions
8 : * are met:
9 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * 3. Neither the name of the Institute nor the names of its contributors
18 : * may be used to endorse or promote products derived from this software
19 : * without specific prior written permission.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : #include "gsskrb5_locl.h"
35 :
36 : OM_uint32 GSSAPI_CALLCONV
37 0 : _gsskrb5_pseudo_random(OM_uint32 *minor_status,
38 : gss_ctx_id_t context_handle,
39 : int prf_key,
40 : const gss_buffer_t prf_in,
41 : ssize_t desired_output_len,
42 : gss_buffer_t prf_out)
43 : {
44 0 : gsskrb5_ctx ctx = (gsskrb5_ctx)context_handle;
45 0 : krb5_context context;
46 0 : krb5_error_code ret;
47 0 : krb5_crypto crypto;
48 0 : krb5_data input, output;
49 0 : uint32_t num;
50 0 : OM_uint32 junk;
51 0 : unsigned char *p;
52 0 : krb5_keyblock *key = NULL;
53 0 : size_t dol;
54 :
55 0 : if (ctx == NULL) {
56 0 : *minor_status = 0;
57 0 : return GSS_S_NO_CONTEXT;
58 : }
59 :
60 0 : if (desired_output_len <= 0 || prf_in->length + 4 < prf_in->length) {
61 0 : *minor_status = 0;
62 0 : return GSS_S_FAILURE;
63 : }
64 0 : dol = desired_output_len;
65 :
66 0 : GSSAPI_KRB5_INIT (&context);
67 :
68 0 : switch(prf_key) {
69 0 : case GSS_C_PRF_KEY_FULL:
70 0 : _gsskrb5i_get_acceptor_subkey(ctx, context, &key);
71 0 : break;
72 0 : case GSS_C_PRF_KEY_PARTIAL:
73 0 : _gsskrb5i_get_initiator_subkey(ctx, context, &key);
74 0 : break;
75 0 : default:
76 0 : _gsskrb5_set_status(EINVAL, "unknown kerberos prf_key");
77 0 : *minor_status = EINVAL;
78 0 : return GSS_S_FAILURE;
79 : }
80 :
81 0 : if (key == NULL) {
82 0 : _gsskrb5_set_status(EINVAL, "no prf_key found");
83 0 : *minor_status = EINVAL;
84 0 : return GSS_S_FAILURE;
85 : }
86 :
87 0 : ret = krb5_crypto_init(context, key, 0, &crypto);
88 0 : krb5_free_keyblock (context, key);
89 0 : if (ret) {
90 0 : *minor_status = ret;
91 0 : return GSS_S_FAILURE;
92 : }
93 :
94 0 : prf_out->value = malloc(dol);
95 0 : if (prf_out->value == NULL) {
96 0 : _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
97 0 : *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
98 0 : krb5_crypto_destroy(context, crypto);
99 0 : return GSS_S_FAILURE;
100 : }
101 0 : prf_out->length = dol;
102 :
103 0 : HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
104 :
105 0 : input.length = prf_in->length + 4;
106 0 : input.data = malloc(prf_in->length + 4);
107 0 : if (input.data == NULL) {
108 0 : _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
109 0 : *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
110 0 : gss_release_buffer(&junk, prf_out);
111 0 : krb5_crypto_destroy(context, crypto);
112 0 : HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
113 0 : return GSS_S_FAILURE;
114 : }
115 0 : memcpy(((uint8_t *)input.data) + 4, prf_in->value, prf_in->length);
116 :
117 0 : num = 0;
118 0 : p = prf_out->value;
119 0 : while(dol > 0) {
120 0 : size_t tsize;
121 :
122 0 : _gss_mg_encode_be_uint32(num, input.data);
123 :
124 0 : ret = krb5_crypto_prf(context, crypto, &input, &output);
125 0 : if (ret) {
126 0 : *minor_status = ret;
127 0 : free(input.data);
128 0 : gss_release_buffer(&junk, prf_out);
129 0 : krb5_crypto_destroy(context, crypto);
130 0 : HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
131 0 : return GSS_S_FAILURE;
132 : }
133 :
134 0 : tsize = min(dol, output.length);
135 0 : memcpy(p, output.data, tsize);
136 0 : p += tsize;
137 0 : dol -= tsize;
138 0 : krb5_data_free(&output);
139 0 : num++;
140 : }
141 0 : free(input.data);
142 :
143 0 : krb5_crypto_destroy(context, crypto);
144 :
145 0 : HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
146 :
147 0 : return GSS_S_COMPLETE;
148 : }
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