1 /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
2  * Use of this source code is governed by a BSD-style license that can be
3  * found in the LICENSE file.
4  *
5  * Tests for api library, new style structs
6  */
7 
8 #include <stdio.h>
9 
10 #include "2sysincludes.h"
11 #include "2api.h"
12 #include "2common.h"
13 #include "2misc.h"
14 #include "2nvstorage.h"
15 #include "2rsa.h"
16 #include "2secdata.h"
17 
18 #include "vb2_common.h"
19 
20 #include "host_key2.h"
21 #include "host_signature2.h"
22 
23 #include "test_common.h"
24 
25 /* Common context for tests */
26 static uint8_t workbuf[VB2_WORKBUF_RECOMMENDED_SIZE]
27 	__attribute__ ((aligned (VB2_WORKBUF_ALIGN)));
28 static struct vb2_context ctx;
29 static struct vb2_shared_data *sd;
30 
31 static const uint8_t mock_body[320] = "Mock body";
32 static const int mock_body_size = sizeof(mock_body);
33 static const int mock_hash_alg = VB2_HASH_SHA256;
34 static int mock_sig_size;
35 
36 static const struct vb2_guid test_guid[4] = {
37 	{.raw = {0x11}},
38 	{.raw = {0x22}},
39 	{.raw = {0x33}},
40 	{.raw = {0x44}},
41 };
42 
43 /* Mocked function data */
44 
45 static enum {
46 	HWCRYPTO_DISABLED,
47 	HWCRYPTO_ENABLED,
48 	HWCRYPTO_FORBIDDEN,
49 } hwcrypto_state;
50 
51 static struct vb2_digest_context hwcrypto_emulation_dc;
52 
53 static int retval_hwcrypto;
54 static int retval_vb2_load_fw_keyblock;
55 static int retval_vb2_load_fw_preamble;
56 
57 /* Type of test to reset for */
58 enum reset_type {
59 	FOR_MISC,
60 	FOR_EXTEND_HASH,
61 	FOR_CHECK_HASH,
62 };
63 
reset_common_data(enum reset_type t)64 static void reset_common_data(enum reset_type t)
65 {
66 	const struct vb2_private_key *hash_key;
67 	struct vb2_fw_preamble *pre;
68 	struct vb2_signature *sig;
69 	uint32_t sig_offset;
70 
71 	int i;
72 
73 	memset(workbuf, 0xaa, sizeof(workbuf));
74 
75 	memset(&ctx, 0, sizeof(ctx));
76 	ctx.workbuf = workbuf;
77 	ctx.workbuf_size = sizeof(workbuf);
78 
79 	vb2_init_context(&ctx);
80 	sd = vb2_get_sd(&ctx);
81 
82 	vb2_nv_init(&ctx);
83 
84 	vb2_secdata_create(&ctx);
85 	vb2_secdata_init(&ctx);
86 
87 	memset(&hwcrypto_emulation_dc, 0, sizeof(hwcrypto_emulation_dc));
88 	retval_hwcrypto = VB2_SUCCESS;
89 	retval_vb2_load_fw_keyblock = VB2_SUCCESS;
90 	retval_vb2_load_fw_preamble = VB2_SUCCESS;
91 
92 	vb2_private_key_hash(&hash_key, mock_hash_alg);
93 
94 	sd->workbuf_preamble_offset = ctx.workbuf_used;
95 	pre = (struct vb2_fw_preamble *)
96 		(ctx.workbuf + sd->workbuf_preamble_offset);
97 	pre->hash_count = 3;
98 	pre->hash_offset = sig_offset = sizeof(*pre);
99 	if (hwcrypto_state == HWCRYPTO_FORBIDDEN)
100 		pre->flags = VB2_FIRMWARE_PREAMBLE_DISALLOW_HWCRYPTO;
101 	else
102 		pre->flags = 0;
103 
104 	for (i = 0; i < 3; i++) {
105 		vb2_sign_data(&sig, mock_body, mock_body_size - 16 * i,
106 			      hash_key, NULL);
107 		memcpy(&sig->guid, test_guid + i, sizeof(sig->guid));
108 		memcpy((uint8_t *)pre + sig_offset, sig, sig->c.total_size);
109 		sig_offset += sig->c.total_size;
110 		mock_sig_size = sig->c.total_size;
111 		free(sig);
112 	}
113 
114 	sd->workbuf_preamble_size = sig_offset;
115 	ctx.workbuf_used = sd->workbuf_preamble_offset
116 		+ sd->workbuf_preamble_size;
117 
118 	if (t == FOR_EXTEND_HASH || t == FOR_CHECK_HASH)
119 		vb2api_init_hash2(&ctx, test_guid, NULL);
120 
121 	if (t == FOR_CHECK_HASH)
122 		vb2api_extend_hash(&ctx, mock_body, mock_body_size);
123 };
124 
125 /* Mocked functions */
126 
vb2_load_fw_keyblock(struct vb2_context * ctx)127 int vb2_load_fw_keyblock(struct vb2_context *ctx)
128 {
129 	return retval_vb2_load_fw_keyblock;
130 }
131 
vb2_load_fw_preamble(struct vb2_context * ctx)132 int vb2_load_fw_preamble(struct vb2_context *ctx)
133 {
134 	return retval_vb2_load_fw_preamble;
135 }
136 
vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg,uint32_t data_size)137 int vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg,
138 			       uint32_t data_size)
139 {
140 	vb2_digest_init(&hwcrypto_emulation_dc, hash_alg);
141 
142 	switch (hwcrypto_state) {
143 	case HWCRYPTO_DISABLED:
144 		return VB2_ERROR_EX_HWCRYPTO_UNSUPPORTED;
145 	case HWCRYPTO_ENABLED:
146 		if (hash_alg != mock_hash_alg)
147 			return VB2_ERROR_SHA_INIT_ALGORITHM;
148 		else
149 			return retval_hwcrypto;
150 	case HWCRYPTO_FORBIDDEN:
151 	default:
152 		return VB2_ERROR_UNKNOWN;
153 	}
154 }
155 
vb2ex_hwcrypto_digest_extend(const uint8_t * buf,uint32_t size)156 int vb2ex_hwcrypto_digest_extend(const uint8_t *buf,
157 				 uint32_t size)
158 {
159 	vb2_digest_extend(&hwcrypto_emulation_dc, buf, size);
160 
161 	if (hwcrypto_state != HWCRYPTO_ENABLED)
162 		return VB2_ERROR_UNKNOWN;
163 
164 	return retval_hwcrypto;
165 }
166 
vb2ex_hwcrypto_digest_finalize(uint8_t * digest,uint32_t digest_size)167 int vb2ex_hwcrypto_digest_finalize(uint8_t *digest,
168 				   uint32_t digest_size)
169 {
170 	vb2_digest_finalize(&hwcrypto_emulation_dc, digest, digest_size);
171 
172 	if (hwcrypto_state != HWCRYPTO_ENABLED)
173 		return VB2_ERROR_UNKNOWN;
174 
175 	return retval_hwcrypto;
176 }
177 
178 /* Tests */
179 
phase3_tests(void)180 static void phase3_tests(void)
181 {
182 	reset_common_data(FOR_MISC);
183 	TEST_SUCC(vb2api_fw_phase3(&ctx), "phase3 good");
184 
185 	reset_common_data(FOR_MISC);
186 	retval_vb2_load_fw_keyblock = VB2_ERROR_MOCK;
187 	TEST_EQ(vb2api_fw_phase3(&ctx), VB2_ERROR_MOCK, "phase3 keyblock");
188 	TEST_EQ(vb2_nv_get(&ctx, VB2_NV_RECOVERY_REQUEST),
189 		VB2_RECOVERY_RO_INVALID_RW, "  recovery reason");
190 
191 	reset_common_data(FOR_MISC);
192 	retval_vb2_load_fw_preamble = VB2_ERROR_MOCK;
193 	TEST_EQ(vb2api_fw_phase3(&ctx), VB2_ERROR_MOCK, "phase3 keyblock");
194 	TEST_EQ(vb2_nv_get(&ctx, VB2_NV_RECOVERY_REQUEST),
195 		VB2_RECOVERY_RO_INVALID_RW, "  recovery reason");
196 }
197 
init_hash_tests(void)198 static void init_hash_tests(void)
199 {
200 	struct vb2_fw_preamble *pre;
201 	struct vb2_signature *sig;
202 	int wb_used_before;
203 	uint32_t size;
204 
205 	reset_common_data(FOR_MISC);
206 	pre = (struct vb2_fw_preamble *)
207 		(ctx.workbuf + sd->workbuf_preamble_offset);
208 	sig = (struct vb2_signature *)((uint8_t *)pre + pre->hash_offset);
209 
210 	wb_used_before = ctx.workbuf_used;
211 	TEST_SUCC(vb2api_init_hash2(&ctx, test_guid, &size),
212 		  "init hash good");
213 	TEST_EQ(sd->workbuf_hash_offset,
214 		(wb_used_before + (VB2_WORKBUF_ALIGN - 1)) &
215 		~(VB2_WORKBUF_ALIGN - 1),
216 		"hash context offset");
217 	TEST_EQ(sd->workbuf_hash_size, sizeof(struct vb2_digest_context),
218 		"hash context size");
219 	TEST_EQ(ctx.workbuf_used,
220 		sd->workbuf_hash_offset + sd->workbuf_hash_size,
221 		"hash uses workbuf");
222 	TEST_EQ(sd->hash_tag,
223 		sd->workbuf_preamble_offset + pre->hash_offset,
224 		"hash signature offset");
225 	TEST_EQ(sd->hash_remaining_size, mock_body_size, "hash remaining");
226 
227 	wb_used_before = ctx.workbuf_used;
228 	TEST_SUCC(vb2api_init_hash2(&ctx, test_guid + 2, NULL),
229 		  "init hash again");
230 	TEST_EQ(ctx.workbuf_used, wb_used_before, "init hash reuses context");
231 	TEST_EQ(sd->hash_tag,
232 		sd->workbuf_preamble_offset + pre->hash_offset +
233 		2 * mock_sig_size,
234 		"hash signature offset 2");
235 
236 	reset_common_data(FOR_MISC);
237 	TEST_EQ(vb2api_init_hash2(&ctx, test_guid + 3, &size),
238 		VB2_ERROR_API_INIT_HASH_GUID, "init hash invalid guid");
239 
240 	reset_common_data(FOR_MISC);
241 	sd->workbuf_preamble_size = 0;
242 	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
243 		VB2_ERROR_API_INIT_HASH_PREAMBLE, "init hash preamble");
244 
245 	reset_common_data(FOR_MISC);
246 	ctx.workbuf_used =
247 		ctx.workbuf_size - sizeof(struct vb2_digest_context) + 8;
248 	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
249 		VB2_ERROR_API_INIT_HASH_WORKBUF, "init hash workbuf");
250 
251 	reset_common_data(FOR_MISC);
252 	sig->hash_alg = VB2_HASH_INVALID;
253 	TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
254 		VB2_ERROR_SHA_INIT_ALGORITHM, "init hash algorithm");
255 
256 	if (hwcrypto_state == HWCRYPTO_ENABLED) {
257 		reset_common_data(FOR_MISC);
258 		retval_hwcrypto = VB2_ERROR_MOCK;
259 		TEST_EQ(vb2api_init_hash2(&ctx, test_guid, &size),
260 			VB2_ERROR_MOCK, "init hash use hwcrypto");
261 	}
262 }
263 
extend_hash_tests(void)264 static void extend_hash_tests(void)
265 {
266 	struct vb2_digest_context *dc;
267 
268 	reset_common_data(FOR_EXTEND_HASH);
269 	TEST_SUCC(vb2api_extend_hash(&ctx, mock_body, 32),
270 		"hash extend good");
271 	TEST_EQ(sd->hash_remaining_size, mock_body_size - 32,
272 		"hash extend remaining");
273 	TEST_SUCC(vb2api_extend_hash(&ctx, mock_body, mock_body_size - 32),
274 		"hash extend again");
275 	TEST_EQ(sd->hash_remaining_size, 0, "hash extend remaining 2");
276 
277 	reset_common_data(FOR_EXTEND_HASH);
278 	sd->workbuf_hash_size = 0;
279 	TEST_EQ(vb2api_extend_hash(&ctx, mock_body, mock_body_size),
280 		VB2_ERROR_API_EXTEND_HASH_WORKBUF, "hash extend no workbuf");
281 
282 	reset_common_data(FOR_EXTEND_HASH);
283 	TEST_EQ(vb2api_extend_hash(&ctx, mock_body, mock_body_size + 1),
284 		VB2_ERROR_API_EXTEND_HASH_SIZE, "hash extend too much");
285 
286 	reset_common_data(FOR_EXTEND_HASH);
287 	TEST_EQ(vb2api_extend_hash(&ctx, mock_body, 0),
288 		VB2_ERROR_API_EXTEND_HASH_SIZE, "hash extend empty");
289 
290 	if (hwcrypto_state == HWCRYPTO_ENABLED) {
291 		reset_common_data(FOR_EXTEND_HASH);
292 		retval_hwcrypto = VB2_ERROR_MOCK;
293 		TEST_EQ(vb2api_extend_hash(&ctx, mock_body, mock_body_size),
294 			VB2_ERROR_MOCK, "hash extend use hwcrypto");
295 	} else {
296 		reset_common_data(FOR_EXTEND_HASH);
297 		dc = (struct vb2_digest_context *)
298 			(ctx.workbuf + sd->workbuf_hash_offset);
299 		dc->hash_alg = VB2_HASH_INVALID;
300 		TEST_EQ(vb2api_extend_hash(&ctx, mock_body, mock_body_size),
301 			VB2_ERROR_SHA_EXTEND_ALGORITHM, "hash extend fail");
302 	}
303 }
304 
check_hash_tests(void)305 static void check_hash_tests(void)
306 {
307 	struct vb2_fw_preamble *pre;
308 	struct vb2_signature *sig;
309 	struct vb2_digest_context *dc;
310 
311 	reset_common_data(FOR_CHECK_HASH);
312 	pre = (struct vb2_fw_preamble *)
313 		(ctx.workbuf + sd->workbuf_preamble_offset);
314 	sig = (struct vb2_signature *)((uint8_t *)pre + pre->hash_offset);
315 	dc = (struct vb2_digest_context *)
316 		(ctx.workbuf + sd->workbuf_hash_offset);
317 
318 	TEST_SUCC(vb2api_check_hash(&ctx), "check hash good");
319 
320 	reset_common_data(FOR_CHECK_HASH);
321 	sd->hash_tag = 0;
322 	TEST_EQ(vb2api_check_hash(&ctx),
323 		VB2_ERROR_API_CHECK_HASH_TAG, "check hash tag");
324 
325 	reset_common_data(FOR_CHECK_HASH);
326 	sd->workbuf_hash_size = 0;
327 	TEST_EQ(vb2api_check_hash(&ctx),
328 		VB2_ERROR_API_CHECK_HASH_WORKBUF, "check hash no workbuf");
329 
330 	reset_common_data(FOR_CHECK_HASH);
331 	sd->hash_remaining_size = 1;
332 	TEST_EQ(vb2api_check_hash(&ctx),
333 		VB2_ERROR_API_CHECK_HASH_SIZE, "check hash size");
334 
335 	reset_common_data(FOR_CHECK_HASH);
336 	ctx.workbuf_used = ctx.workbuf_size;
337 	TEST_EQ(vb2api_check_hash(&ctx),
338 		VB2_ERROR_API_CHECK_HASH_WORKBUF_DIGEST, "check hash workbuf");
339 
340 	reset_common_data(FOR_CHECK_HASH);
341 	*((uint8_t *)sig + sig->sig_offset) ^= 0x55;
342 	TEST_EQ(vb2api_check_hash(&ctx),
343 		VB2_ERROR_API_CHECK_HASH_SIG, "check hash sig");
344 
345 	if (hwcrypto_state == HWCRYPTO_ENABLED) {
346 		reset_common_data(FOR_CHECK_HASH);
347 		retval_hwcrypto = VB2_ERROR_MOCK;
348 		TEST_EQ(vb2api_check_hash(&ctx),
349 			VB2_ERROR_MOCK, "check hash use hwcrypto");
350 	} else {
351 		reset_common_data(FOR_CHECK_HASH);
352 		dc->hash_alg = VB2_HASH_INVALID;
353 		*((uint8_t *)sig + sig->sig_offset) ^= 0x55;
354 		TEST_EQ(vb2api_check_hash(&ctx),
355 			VB2_ERROR_SHA_FINALIZE_ALGORITHM, "check hash finaliz");
356 	}
357 }
358 
main(int argc,char * argv[])359 int main(int argc, char* argv[])
360 {
361 	phase3_tests();
362 
363 	fprintf(stderr, "Running hash API tests without hwcrypto support...\n");
364 	hwcrypto_state = HWCRYPTO_DISABLED;
365 	init_hash_tests();
366 	extend_hash_tests();
367 	check_hash_tests();
368 
369 	fprintf(stderr, "Running hash API tests with hwcrypto support...\n");
370 	hwcrypto_state = HWCRYPTO_ENABLED;
371 	init_hash_tests();
372 	extend_hash_tests();
373 	check_hash_tests();
374 
375 	fprintf(stderr, "Running hash API tests with forbidden hwcrypto...\n");
376 	hwcrypto_state = HWCRYPTO_FORBIDDEN;
377 	init_hash_tests();
378 	extend_hash_tests();
379 	check_hash_tests();
380 
381 	return gTestSuccess ? 0 : 255;
382 }
383