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-3-Clause */
/*
* Part of this file is copied from tpm2-tss-engine.
*
* Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
* All rights reserved.
* Copyright (c) 2019, Wind River Systems.
* All rights reserved.
*/
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "files.h"
#include "log.h"
#include "tpm2.h"
#include "tpm2_options.h"
#include "tpm2_tool.h"
#include "object.h"
typedef struct tpm_encodeobject_ctx tpm_encodeobject_ctx;
struct tpm_encodeobject_ctx {
struct {
const char *ctx_path;
const char *auth_str;
tpm2_loaded_object object;
} parent;
struct {
const char *pubpath;
TPM2B_PUBLIC public;
const char *privpath;
TPM2B_PRIVATE private;
ESYS_TR handle;
bool needs_auth;
} object;
char *output_path;
bool autoflush;
};
static tpm_encodeobject_ctx ctx = {
.autoflush = false,
};
static bool on_option(char key, char *value) {
switch (key) {
case 'P':
ctx.parent.auth_str = value;
break;
case 'u':
ctx.object.pubpath = value;
break;
case 'r':
ctx.object.privpath = value;
break;
case 'C':
ctx.parent.ctx_path = value;
break;
case 'o':
ctx.output_path = value;
break;
case 'p':
ctx.object.needs_auth = true;
break;
}
return true;
}
static bool tpm2_tool_onstart(tpm2_options **opts) {
const struct option topts[] = {
{ "auth", required_argument, NULL, 'P' },
{ "public", required_argument, NULL, 'u' },
{ "private", required_argument, NULL, 'r' },
{ "parent-context", required_argument, NULL, 'C' },
{ "output", required_argument, NULL, 'o' },
{ "key-auth", no_argument, NULL, 'p' },
{ "autoflush", no_argument, NULL, 'R' },
};
*opts = tpm2_options_new("P:u:r:C:o:pR", ARRAY_LEN(topts), topts, on_option,
NULL, 0);
return *opts != NULL;
}
static tool_rc check_opts(void) {
tool_rc rc = tool_rc_success;
if (!ctx.parent.ctx_path) {
LOG_ERR("Expected parent object via -C");
rc = tool_rc_option_error;
}
if (!ctx.object.pubpath) {
LOG_ERR("Expected public object portion via -u");
rc = tool_rc_option_error;
}
if (!ctx.object.privpath) {
LOG_ERR("Expected private object portion via -r");
rc = tool_rc_option_error;
}
if (!ctx.output_path) {
LOG_ERR("Expected output file path via -o");
rc = tool_rc_option_error;
}
return rc;
}
static tool_rc init(ESYS_CONTEXT *ectx) {
bool res = files_load_public(ctx.object.pubpath, &ctx.object.public);
if (!res) {
return tool_rc_general_error;
}
res = files_load_private(ctx.object.privpath, &ctx.object.private);
if (!res) {
return tool_rc_general_error;
}
return tpm2_util_object_load_auth(ectx, ctx.parent.ctx_path,
ctx.parent.auth_str, &ctx.parent.object, false,
TPM2_HANDLE_ALL_W_NV);
}
static int encode(ESYS_CONTEXT *ectx) {
uint8_t private_buf[sizeof(ctx.object.private)];
size_t private_len = 0;
tool_rc rc = tool_rc_general_error;
BIO *bio = NULL;
TSSPRIVKEY_OBJ *tpk = NULL;
BIGNUM *bn_parent = NULL;
TSS2_RC rval = Tss2_MU_TPM2B_PRIVATE_Marshal(&ctx.object.private,
private_buf, sizeof(private_buf), &private_len);
if (rval != TPM2_RC_SUCCESS) {
LOG_ERR("Error serializing private portion of object");
goto error;
}
size_t public_len = 0;
uint8_t public_buf[sizeof(ctx.object.public)];
rval = Tss2_MU_TPM2B_PUBLIC_Marshal(&ctx.object.public, public_buf,
sizeof(public_buf), &public_len);
if (rval != TPM2_RC_SUCCESS) {
LOG_ERR("Error serializing public portion of object");
goto error;
}
tpk = TSSPRIVKEY_OBJ_new();
if (!tpk) {
LOG_ERR("oom");
goto error;
}
tpk->type = OBJ_txt2obj(OID_loadableKey, 1);
if (!tpk->type) {
LOG_ERR("oom");
goto error;
}
tpk->emptyAuth = ctx.object.needs_auth;
bn_parent = BN_new();
if (!bn_parent) {
goto error;
}
if ((ctx.parent.object.handle >> TPM2_HR_SHIFT) == TPM2_HT_PERSISTENT) {
BN_set_word(bn_parent, ctx.parent.object.handle);
} else {
/* Indicate that the parent is a primary object generated on the fly. */
BN_set_word(bn_parent, TPM2_RH_OWNER);
}
BN_to_ASN1_INTEGER(bn_parent, tpk->parent);
ASN1_STRING_set(tpk->privkey, private_buf, private_len);
ASN1_STRING_set(tpk->pubkey, public_buf, public_len);
bio = BIO_new_file(ctx.output_path, "w");
if (bio == NULL) {
LOG_ERR("Could not open file: \"%s\"", ctx.output_path);
goto error;
}
PEM_write_bio_TSSPRIVKEY_OBJ(bio, tpk);
if ((ctx.autoflush || tpm2_util_env_yes(TPM2TOOLS_ENV_AUTOFLUSH)) &&
ctx.parent.object.path &&
(ctx.parent.object.handle & TPM2_HR_RANGE_MASK) == TPM2_HR_TRANSIENT) {
rval = Esys_FlushContext(ectx, ctx.parent.object.tr_handle);
if (rval != TPM2_RC_SUCCESS) {
return tool_rc_general_error;
}
}
rc = tool_rc_success;
error:
BN_free(bn_parent);
if (bio)
BIO_free(bio);
if (tpk)
TSSPRIVKEY_OBJ_free(tpk);
return rc;
}
static tool_rc tpm2_tool_onrun(ESYS_CONTEXT *ectx, tpm2_option_flags flags) {
UNUSED(flags);
tool_rc rc = check_opts();
if (rc != tool_rc_success) {
return rc;
}
rc = init(ectx);
if (rc != tool_rc_success) {
return rc;
}
return encode(ectx);
}
// Register this tool with tpm2_tool.c
TPM2_TOOL_REGISTER("encodeobject", tpm2_tool_onstart, tpm2_tool_onrun, NULL, NULL)
|
