1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2004 IBM Corporation
4 * Copyright (C) 2014 Intel Corporation
7 #include <linux/string.h>
10 #include <linux/tpm_command.h>
12 #include <keys/trusted-type.h>
13 #include <keys/trusted_tpm.h>
15 static struct tpm2_hash tpm2_hash_map[] = {
16 {HASH_ALGO_SHA1, TPM_ALG_SHA1},
17 {HASH_ALGO_SHA256, TPM_ALG_SHA256},
18 {HASH_ALGO_SHA384, TPM_ALG_SHA384},
19 {HASH_ALGO_SHA512, TPM_ALG_SHA512},
20 {HASH_ALGO_SM3_256, TPM_ALG_SM3_256},
24 * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
26 * @buf: an allocated tpm_buf instance
27 * @session_handle: session handle
28 * @nonce: the session nonce, may be NULL if not used
29 * @nonce_len: the session nonce length, may be 0 if not used
30 * @attributes: the session attributes
31 * @hmac: the session HMAC or password, may be NULL if not used
32 * @hmac_len: the session HMAC or password length, maybe 0 if not used
34 static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
35 const u8 *nonce, u16 nonce_len,
37 const u8 *hmac, u16 hmac_len)
39 tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
40 tpm_buf_append_u32(buf, session_handle);
41 tpm_buf_append_u16(buf, nonce_len);
43 if (nonce && nonce_len)
44 tpm_buf_append(buf, nonce, nonce_len);
46 tpm_buf_append_u8(buf, attributes);
47 tpm_buf_append_u16(buf, hmac_len);
50 tpm_buf_append(buf, hmac, hmac_len);
54 * tpm2_seal_trusted() - seal the payload of a trusted key
56 * @chip: TPM chip to use
57 * @payload: the key data in clear and encrypted form
58 * @options: authentication values and other options
60 * Return: < 0 on error and 0 on success.
62 int tpm2_seal_trusted(struct tpm_chip *chip,
63 struct trusted_key_payload *payload,
64 struct trusted_key_options *options)
66 unsigned int blob_len;
72 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
73 if (options->hash == tpm2_hash_map[i].crypto_id) {
74 hash = tpm2_hash_map[i].tpm_id;
79 if (i == ARRAY_SIZE(tpm2_hash_map))
82 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
86 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
92 tpm_buf_append_u32(&buf, options->keyhandle);
93 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
95 0 /* session_attributes */,
96 options->keyauth /* hmac */,
100 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
102 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
103 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
104 tpm_buf_append_u16(&buf, payload->key_len + 1);
105 tpm_buf_append(&buf, payload->key, payload->key_len);
106 tpm_buf_append_u8(&buf, payload->migratable);
109 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
110 tpm_buf_append_u16(&buf, TPM_ALG_KEYEDHASH);
111 tpm_buf_append_u16(&buf, hash);
114 if (options->policydigest_len) {
115 tpm_buf_append_u32(&buf, 0);
116 tpm_buf_append_u16(&buf, options->policydigest_len);
117 tpm_buf_append(&buf, options->policydigest,
118 options->policydigest_len);
120 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
121 tpm_buf_append_u16(&buf, 0);
124 /* public parameters */
125 tpm_buf_append_u16(&buf, TPM_ALG_NULL);
126 tpm_buf_append_u16(&buf, 0);
129 tpm_buf_append_u16(&buf, 0);
132 tpm_buf_append_u32(&buf, 0);
134 if (buf.flags & TPM_BUF_OVERFLOW) {
139 rc = tpm_transmit_cmd(chip, &buf, 4, "sealing data");
143 blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]);
144 if (blob_len > MAX_BLOB_SIZE) {
148 if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 4 + blob_len) {
153 memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
154 payload->blob_len = blob_len;
157 tpm_buf_destroy(&buf);
160 if (tpm2_rc_value(rc) == TPM2_RC_HASH)
171 * tpm2_load_cmd() - execute a TPM2_Load command
173 * @chip: TPM chip to use
174 * @payload: the key data in clear and encrypted form
175 * @options: authentication values and other options
176 * @blob_handle: returned blob handle
178 * Return: 0 on success.
179 * -E2BIG on wrong payload size.
180 * -EPERM on tpm error status.
181 * < 0 error from tpm_send.
183 static int tpm2_load_cmd(struct tpm_chip *chip,
184 struct trusted_key_payload *payload,
185 struct trusted_key_options *options,
189 unsigned int private_len;
190 unsigned int public_len;
191 unsigned int blob_len;
194 private_len = be16_to_cpup((__be16 *) &payload->blob[0]);
195 if (private_len > (payload->blob_len - 2))
198 public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]);
199 blob_len = private_len + public_len + 4;
200 if (blob_len > payload->blob_len)
203 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
207 tpm_buf_append_u32(&buf, options->keyhandle);
208 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
210 0 /* session_attributes */,
211 options->keyauth /* hmac */,
214 tpm_buf_append(&buf, payload->blob, blob_len);
216 if (buf.flags & TPM_BUF_OVERFLOW) {
221 rc = tpm_transmit_cmd(chip, &buf, 4, "loading blob");
223 *blob_handle = be32_to_cpup(
224 (__be32 *) &buf.data[TPM_HEADER_SIZE]);
227 tpm_buf_destroy(&buf);
236 * tpm2_unseal_cmd() - execute a TPM2_Unload command
238 * @chip: TPM chip to use
239 * @payload: the key data in clear and encrypted form
240 * @options: authentication values and other options
241 * @blob_handle: blob handle
243 * Return: 0 on success
244 * -EPERM on tpm error status
245 * < 0 error from tpm_send
247 static int tpm2_unseal_cmd(struct tpm_chip *chip,
248 struct trusted_key_payload *payload,
249 struct trusted_key_options *options,
257 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
261 tpm_buf_append_u32(&buf, blob_handle);
262 tpm2_buf_append_auth(&buf,
263 options->policyhandle ?
264 options->policyhandle : TPM2_RS_PW,
266 TPM2_SA_CONTINUE_SESSION,
267 options->blobauth /* hmac */,
270 rc = tpm_transmit_cmd(chip, &buf, 6, "unsealing");
275 data_len = be16_to_cpup(
276 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
277 if (data_len < MIN_KEY_SIZE || data_len > MAX_KEY_SIZE + 1) {
282 if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 6 + data_len) {
286 data = &buf.data[TPM_HEADER_SIZE + 6];
288 memcpy(payload->key, data, data_len - 1);
289 payload->key_len = data_len - 1;
290 payload->migratable = data[data_len - 1];
294 tpm_buf_destroy(&buf);
299 * tpm2_unseal_trusted() - unseal the payload of a trusted key
301 * @chip: TPM chip to use
302 * @payload: the key data in clear and encrypted form
303 * @options: authentication values and other options
305 * Return: Same as with tpm_send.
307 int tpm2_unseal_trusted(struct tpm_chip *chip,
308 struct trusted_key_payload *payload,
309 struct trusted_key_options *options)
314 rc = tpm_try_get_ops(chip);
318 rc = tpm2_load_cmd(chip, payload, options, &blob_handle);
322 rc = tpm2_unseal_cmd(chip, payload, options, blob_handle);
323 tpm2_flush_context(chip, blob_handle);