-
Notifications
You must be signed in to change notification settings - Fork 105
/
tcti_ldr.c
231 lines (188 loc) · 6.04 KB
/
tcti_ldr.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/* SPDX-License-Identifier: BSD-2 */
/*
* Copyright (c) 2018, Intel Corporation
* All rights reserved.
*/
//**********************************************************************;
// Copyright (c) 2018, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//**********************************************************************;
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <tss2/tss2_sys.h>
#include "log.h"
#include "tcti_ldr.h"
#include "utils.h"
#define TPM2_PKCS11_TCTI "TPM2_PKCS11_TCTI"
typedef struct tcti_conf tcti_conf;
struct tcti_conf {
const char *name;
const char *opts;
};
static void *handle;
static const TSS2_TCTI_INFO *info;
bool tpm2_tcti_ldr_is_tcti_present(const char *name) {
char path[PATH_MAX];
snprintf(path, sizeof(path), "libtss2-tcti-%s.so", name);
void *handle = dlopen (path, RTLD_LAZY);
if (handle) {
dlclose(handle);
}
return handle != NULL;
}
TSS2_TCTI_CONTEXT *tpm2_tcti_ldr_load(const char *path, const char *opts) {
TSS2_TCTI_CONTEXT *tcti_ctx = NULL;
if (!handle) {
/*
* Try what they gave us, if it doesn't load up, try
* libtss2-tcti-xxx.so replacing xxx with what they gave us.
*/
handle = dlopen (path, RTLD_LAZY);
if (!handle) {
char buf[PATH_MAX];
size_t size = snprintf(buf, sizeof(buf), "libtss2-tcti-%s.so", path);
if (size >= sizeof(buf)) {
LOGE("Truncated friendly name conversion, got: \"%s\", made: \"%s\"",
path, buf);
return NULL;
}
handle = dlopen (buf, RTLD_LAZY);
if (!handle) {
LOGE("Could not dlopen library: \"%s\"", buf);
return NULL;
}
}
}
TSS2_TCTI_INFO_FUNC infofn = (TSS2_TCTI_INFO_FUNC)dlsym(handle, TSS2_TCTI_INFO_SYMBOL);
if (!infofn) {
LOGE("Symbol \"%s\"not found in library: \"%s\"",
TSS2_TCTI_INFO_SYMBOL, path);
goto err;
}
info = infofn();
TSS2_TCTI_INIT_FUNC init = info->init;
size_t size;
TSS2_RC rc = init(NULL, &size, opts);
if (rc != TPM2_RC_SUCCESS) {
LOGE("tcti init setup routine failed for library: \"%s\""
" options: \"%s\"", path, opts);
goto err;
}
tcti_ctx = (TSS2_TCTI_CONTEXT*) calloc(1, size);
if (tcti_ctx == NULL) {
LOGE("oom");
goto err;
}
rc = init(tcti_ctx, &size, opts);
if (rc != TPM2_RC_SUCCESS) {
LOGE("tcti init allocation routine failed for library: \"%s\""
" options: \"%s\"", path, opts);
goto err;
}
return tcti_ctx;
err:
free(tcti_ctx);
dlclose(handle);
return NULL;
}
static inline const char *fixup_name(const char *name) {
return !strcmp(name, "abrmd") ? "tabrmd" : name;
}
const char *find_default_tcti(void) {
const char *defaults[] = {
"tabrmd",
"device",
"mssim"
};
size_t i;
for(i=0; i < ARRAY_LEN(defaults); i++) {
const char *name = defaults[i];
bool is_present = tpm2_tcti_ldr_is_tcti_present(name);
if (is_present) {
return name;
}
}
return NULL;
}
tcti_conf tcti_get_config(void) {
/* set up the default configuration */
tcti_conf conf = {
.name = find_default_tcti()
};
/* no tcti config supplied, get it from env */
char *optstr = getenv (TPM2_PKCS11_TCTI);
if (!optstr) {
/* nothing user supplied, use default */
return conf;
}
char *split = strchr(optstr, ':');
if (!split) {
/* --tcti=device */
conf.name = fixup_name(optstr);
return conf;
}
/*
* If it has a ":", it could be either one of the following:
* case A: --tcti=: --> default name and default (null) config
* case B: --tcti=:/dev/foo --> default name, custom config
* case C: --tcti=device: --> custom name, default (null) config
* case D: --tcti=device:/dev/foo --> custom name, custom config
*/
split[0] = '\0';
/* Case A */
if (!optstr[0] && !split[1]) {
return conf;
}
/* Case B */
if (!optstr[0]) {
conf.opts = &split[1];
return conf;
}
/* Case C */
if (!split[1]) {
conf.name = fixup_name(optstr);
return conf;
}
/* Case D */
conf.name = fixup_name(optstr);
conf.opts = &split[1];
return conf;
}
TSS2_TCTI_CONTEXT *tcti_ldr_load(void) {
tcti_conf conf = tcti_get_config();
return tpm2_tcti_ldr_load(conf.name, conf.opts);
}
void tcti_ldr_unload(void) {
if (handle) {
#ifndef DISABLE_DLCLOSE
dlclose(handle);
#endif
handle = NULL;
info = NULL;
}
}