// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 IBM Corporation
* Copyright (c) 2019-2021, Linaro Limited
*
* See Documentation/security/keys/trusted-encrypted.rst
*/
#include <crypto/hash_info.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/parser.h>
#include <linux/string.h>
#include <linux/err.h>
#include <keys/trusted-type.h>
#include <linux/key-type.h>
#include <linux/crypto.h>
#include <crypto/hash.h>
#include <crypto/sha1.h>
#include <linux/tpm.h>
#include <linux/tpm_command.h>
#include <keys/trusted_tpm.h>
static const char hmac_alg[] = "hmac(sha1)";
static const char hash_alg[] = "sha1";
static struct tpm_chip *chip;
static struct tpm_digest *digests;
struct sdesc {
struct shash_desc shash;
char ctx[];
};
static struct crypto_shash *hashalg;
static struct crypto_shash *hmacalg;
static struct sdesc *init_sdesc(struct crypto_shash *alg)
{
struct sdesc *sdesc;
int size;
size = sizeof(struct shash_desc) + crypto_shash_descsize(alg);
sdesc = kmalloc(size, GFP_KERNEL);
if (!sdesc)
return ERR_PTR(-ENOMEM);
sdesc->shash.tfm = alg;
return sdesc;
}
static int TSS_sha1(const unsigned char *data, unsigned int datalen,
unsigned char *digest)
{
struct sdesc *sdesc;
int ret;
sdesc = init_sdesc(hashalg);
if (IS_ERR(sdesc)) {
pr_info("can't alloc %s\n", hash_alg);
return PTR_ERR(sdesc);
}
ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest);
kfree_sensitive(sdesc);
return ret;
}
static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, ...)
{
struct sdesc *sdesc;
va_list argp;
unsigned int dlen;
unsigned char *data;
int ret;
sdesc = init_sdesc(hmacalg);
if (IS_ERR(sdesc)) {
pr_info("can't alloc %s\n", hmac_alg);
return PTR_ERR(sdesc);
}
ret = crypto_shash_setkey(hmacalg, key, keylen);
if (ret < 0)
goto out;
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
va_start(argp, keylen);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
if (data == NULL) {
ret = -EINVAL;
break;
}
ret = crypto_shash_update(&sdesc->shash, data, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, digest);
out:
kfree_sensitive(sdesc);
return ret;
}
/*
* calculate authorization info fields to send to TPM
*/
int TSS_authhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, unsigned char *h1,
unsigned char *h2, unsigned int h3, ...)
{
unsigned char paramdigest[SHA1_DIGEST_SIZE];
struct sdesc *sdesc;
unsigned int dlen;
unsigned char *data;
unsigned char c;
int ret;
va_list argp;
if (!chip)
return -ENODEV;
sdesc = init_sdesc(hashalg);
if (IS_ERR(sdesc)) {
pr_info("can't alloc %s\n", hash_alg);
return PTR_ERR(sdesc);
}
c = !!h3;
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
va_start(argp, h3);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
data = va_arg(argp, unsigned char *);
if (!data) {
ret = -EINVAL;
break;
}
ret = crypto_shash_update(&sdesc->shash, data, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (!ret)
ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, h1,
TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
out:
kfree_sensitive(sdesc);
return ret;
}
EXPORT_SYMBOL_GPL(TSS_authhmac);
/*
* verify the AUTH1_COMMAND (Seal) result from TPM
*/
int TSS_checkhmac1(unsigned char *buffer,
const uint32_t command,
const unsigned char *ononce,
const unsigned char *key,
unsigned int keylen, ...)
{
uint32_t bufsize;
uint16_t tag;
uint32_t ordinal;
uint32_t result;
unsigned char *enonce;
unsigned char *continueflag;
unsigned char *authdata;
unsigned char testhmac[SHA1_DIGEST_SIZE];
unsigned char paramdigest[SHA1_DIGEST_SIZE];
struct sdesc *sdesc;
unsigned int dlen;
unsigned int dpos;
va_list argp;
int ret;
if (!chip)
return -ENODEV;
bufsize = LOAD32(buffer, TPM_SIZE_OFFSET);
tag = LOAD16(buffer, 0);
ordinal = command;
result = LOAD32N(buffer, TPM_RETURN_OFFSET);
if (tag == TPM_TAG_RSP_COMMAND)
return 0;
if (tag != TPM_TAG_RSP_AUTH1_COMMAND)
return -EINVAL;
authdata = buffer + bufsize - SHA1_DIGEST_SIZE;
continueflag = authdata - 1;
enonce = continueflag - TPM_NONCE_SIZE;
sdesc = init_sdesc(hashalg);
if (IS_ERR(sdesc)) {
pr_info("can't alloc %s\n", hash_alg);
return PTR_ERR(sdesc);
}
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result,
sizeof result);
if (ret < 0)
goto out;
ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal,
sizeof ordinal);
if (ret < 0)
goto out;
va_start(argp, keylen);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
dpos = va_arg(argp, unsigned int);
ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (ret < 0)
goto out;
ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest,
TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce,
1, continueflag, 0, 0);
if (ret < 0)
goto out;
if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE))
ret = -EINVAL;
out:
kfree_sensitive(sdesc);
return ret;
}
EXPORT_SYMBOL_GPL(TSS_checkhmac1);
/*
* verify the AUTH2_COMMAND (unseal) result from TPM
*/
static int TSS_checkhmac2(unsigned char *buffer,
const uint32_t command,
const unsigned char *ononce,
const unsigned char *key1,
unsigned int keylen1,
const unsigned char *key2,
unsigned int keylen2, ...)
{
uint32_t bufsize;
uint16_t tag;
uint32_t ordinal;
uint32_t result;
unsigned char *enonce1;
unsigned char *continueflag1;
unsigned char *authdata1;
unsigned char *enonce2;
unsigned char *continueflag2;
unsigned char *authdata2;
unsigned char testhmac1[SHA1_DIGEST_SIZE];
unsigned char testhmac2[SHA1_DIGEST_SIZE];
unsigned char paramdigest[SHA1_DIGEST_SIZE];
struct sdesc *sdesc;
unsigned int dlen;
unsigned int dpos;
va_list argp;
int ret;
bufsize = LOAD32(buffer, TPM_SIZE_OFFSET);
tag = LOAD16(buffer, 0);
ordinal = command;
result = LOAD32N(buffer, TPM_RETURN_OFFSET);
if (tag == TPM_TAG_RSP_COMMAND)
return 0;
if (tag != TPM_TAG_RSP_AUTH2_COMMAND)
return -EINVAL;
authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1
+ SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE);
authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE);
continueflag1 = authdata1 - 1;
continueflag2 = authdata2 - 1;
enonce1 = continueflag1 - TPM_NONCE_SIZE;
enonce2 = continueflag2 - TPM_NONCE_SIZE;
sdesc = init_sdesc(hashalg);
if (IS_ERR(sdesc)) {
pr_info("can't alloc %s\n", hash_alg);
return PTR_ERR(sdesc);
}
ret = crypto_shash_init(&sdesc->shash);
if (ret < 0)
goto out;
ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result,
sizeof result);
if (ret < 0)
goto out;
ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal,
sizeof ordinal);
if (ret < 0)
goto out;
va_start(argp, keylen2);
for (;;) {
dlen = va_arg(argp, unsigned int);
if (dlen == 0)
break;
dpos = va_arg(argp, unsigned int);
ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
if (ret < 0)
break;
}
va_end(argp);
if (!ret)
ret = crypto_shash_final(&sdesc->shash, paramdigest);
if (ret < 0)
goto out;
ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, enonce1,
TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0);
if (ret < 0)
goto out;
if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) {
ret = -EINVAL;
goto out;
}
ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE,
paramdigest, TPM_NONCE_SIZE, enonce2,
TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0);
if (ret < 0)
goto out;
if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE))
ret = -EINVAL;
out:
kfree_sensitive(sdesc);
return ret;
}
/*
* For key specific tpm requests, we will generate and send our
* own TPM command packets using the drivers send function.
*/
int trusted_tpm_send(unsigned char *cmd, size_t buflen)
{
struct tpm_buf buf;
int rc;
if (!chip)
return -ENODEV;
rc = tpm_try_get_ops(chip);
if (rc)
return rc;
buf.flags = 0;
buf.length = buflen;
buf.data = cmd;
dump_tpm_buf(cmd);
rc = tpm_transmit_cmd(chip, &buf, 4, "sending data");
dump_tpm_buf(cmd);
if (rc > 0)
/* TPM error */
rc = -EPERM;
tpm_put_ops(chip);
return rc;
}
EXPORT_SYMBOL_GPL(trusted_tpm_send);
/*
* Lock a trusted key, by extending a selected PCR.
*
* Prevents a trusted key that is sealed to PCRs from being accessed.
* This uses the tpm driver's extend function.
*/
static int pcrlock(const int pcrnum)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return tpm_pcr_extend(chip, pcrnum, digests) ? -EINVAL : 0;
}
/*
* Create an object specific authorisation protocol (OSAP) session
*/
static int osap(struct tpm_buf *tb, struct osapsess *s,
const unsigned char *key, uint16_t type, uint32_t handle)
{
unsigned char enonce[TPM_NONCE_SIZE];
unsigned char ononce[TPM_NONCE_SIZE];
int ret;
ret = tpm_get_random(chip, ononce, TPM_NONCE_SIZE);
if (ret < 0)
return ret;
if (ret != TPM_NONCE_SIZE)
return -EIO;
tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OSAP);
tpm_buf_append_u16(tb, type);
tpm_buf_append_u32(tb, handle);
tpm_buf_append(tb, ononce, TPM_NONCE_SIZE);
ret = trusted_tpm_send(tb->data, tb->length);
if (ret < 0)
return ret;
s->handle = LOAD32(tb->data, TPM_DATA_OFFSET);
memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]),
TPM_NONCE_SIZE);
memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) +
TPM_NONCE_SIZE]), TPM_NONCE_SIZE);
return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE,
enonce, TPM_NONCE_SIZE, ononce, 0, 0);
}
/*
* Create an object independent authorisation protocol (oiap) session
*/
int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
{
int ret;
if (!chip)
return -ENODEV;
tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OIAP);
ret = trusted_tpm_send(tb->data, tb->length);
if (ret < 0)
return ret;
*handle = LOAD32(tb->data, TPM_DATA_OFFSET);
memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)],
TPM_NONCE_SIZE);
return 0;
}
EXPORT_SYMBOL_GPL(oiap);
struct tpm_digests {
unsigned char encauth[SHA1_DIGEST_SIZE];
unsigned char pubauth[SHA1_DIGEST_SIZE];
unsigned char xorwork[SHA1_DIGEST_SIZE * 2];
unsigned char xorhash[SHA1_DIGEST_SIZE];
unsigned char nonceodd[TPM_NONCE_SIZE];
};
/*
* Have the TPM seal(encrypt) the trusted key, possibly based on
* Platform Configuration Registers (PCRs). AUTH1 for sealing key.
*/
static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
uint32_t keyhandle, const unsigned char *keyauth,
const unsigned char *data, uint32_t datalen,
unsigned char *blob, uint32_t *bloblen,
const unsigned char *blobauth,
const unsigned char *pcrinfo, uint32_t pcrinfosize)
{
struct osapsess sess;
struct tpm_digests *td;
unsigned char cont;
uint32_t ordinal;
uint32_t pcrsize;
uint32_t datsize;
int sealinfosize;
int encdatasize;
int storedsize;
int ret;
int i;
/* alloc some work space for all the hashes */
td = kmalloc(sizeof *td, GFP_KERNEL);
if (!td)
return -ENOMEM;
/* get session for sealing key */
ret = osap(tb, &sess, keyauth, keytype, keyhandle);
if (ret < 0)
goto out;
dump_sess(&sess);
/* calculate encrypted authorization value */
memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE);
memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE);
ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash);
if (ret < 0)
goto out;
ret = tpm_get_random(chip, td->nonceodd, TPM_NONCE_SIZE);
if (ret < 0)
goto out;
if (ret != TPM_NONCE_SIZE) {
ret = -EIO;
goto out;
}
ordinal = htonl(TPM_ORD_SEAL);
datsize = htonl(datalen);
pcrsize = htonl(pcrinfosize);
cont = 0;
/* encrypt data authorization key */
for (i = 0; i < SHA1_DIGEST_SIZE; ++i)
td->encauth[i] = td->xorhash[i] ^ blobauth[i];
/* calculate authorization HMAC value */
if (pcrinfosize == 0) {
/* no pcr info specified */
ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE,
sess.enonce, td->nonceodd, cont,
sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE,
td->encauth, sizeof(uint32_t), &pcrsize,
sizeof(uint32_t), &datsize, datalen, data, 0,
0);
} else {
/* pcr info specified */
ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE,
sess.enonce, td->nonceodd, cont,
sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE,
td->encauth, sizeof(uint32_t), &pcrsize,
pcrinfosize, pcrinfo, sizeof(uint32_t),
&datsize, datalen, data, 0, 0);
}
if (ret < 0)
goto out;
/* build and send the TPM request packet */
tpm_buf_reset(tb, TPM_TAG_RQU_AUTH1_COMMAND, TPM_ORD_SEAL);
tpm_buf_append_u32(tb, keyhandle);
tpm_buf_append(tb, td->encauth, SHA1_DIGEST_SIZE);
tpm_buf_append_u32(tb, pcrinfosize);
tpm_buf_append(tb, pcrinfo, pcrinfosize);
tpm_buf_append_u32(tb, datalen);
tpm_buf_append(tb, data, datalen);
tpm_buf_append_u32(tb, sess.handle);
tpm_buf_append(tb, td->nonceodd, TPM_NONCE_SIZE);
tpm_buf_append_u8(tb, cont);
tpm_buf_append(tb, td->pubauth, SHA1_DIGEST_SIZE);
ret = trusted_tpm_send(tb->data, tb->length);
if (ret < 0)
goto out;
/* calculate the size of the returned Blob */
sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t));
encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) +
sizeof(uint32_t) + sealinfosize);
storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize +
sizeof(uint32_t) + encdatasize;
/* check the HMAC in the response */
ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret,
SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0,
0);
/* copy the returned blob to caller */
if (!ret) {
memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize);
*bloblen = storedsize;
}
out:
kfree_sensitive(td);
return ret;
}
/*
* use the AUTH2_COMMAND form of unseal, to authorize both key and blob
*/
static int tpm_unseal(struct tpm_buf *tb,
uint32_t keyhandle, const unsigned char *keyauth,
const unsigned char *blob, int bloblen,
const unsigned char *blobauth,
unsigned char *data, unsigned int *datalen)
{
unsigned char nonceodd[TPM_NONCE_SIZE];
unsigned char enonce1[TPM_NONCE_SIZE];
unsigned char enonce2[TPM_NONCE_SIZE];
unsigned char authdata1[SHA1_DIGEST_SIZE];
unsigned char authdata2[SHA1_DIGEST_SIZE];
uint32_t authhandle1 = 0;
uint32_t authhandle2 = 0;
unsigned char cont = 0;
uint32_t ordinal;
int ret;
/* sessions for unsealing key and data */
ret = oiap(tb, &authhandle1, enonce1);
if (ret < 0) {
pr_info("oiap failed (%d)\n", ret);
return ret;
}
ret = oiap(tb, &authhandle2, enonce2);
if (ret < 0) {
pr_info("oiap failed (%d)\n", ret);
return ret;
}
ordinal = htonl(TPM_ORD_UNSEAL);
ret = tpm_get_random(chip, nonceodd, TPM_NONCE_SIZE);
if (ret < 0)
return ret;
if (ret != TPM_NONCE_SIZE) {
pr_info("tpm_get_random failed (%d)\n", ret);
return -EIO;
}
ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE,
enonce1, nonceodd, cont, sizeof(uint32_t),
&ordinal, bloblen, blob, 0, 0);
if (ret < 0)
return ret;
ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE,
enonce2, nonceodd, cont, sizeof(uint32_t),
&ordinal, bloblen, blob, 0, 0);
if (ret < 0)
return ret;
/* build and send TPM request packet */
tpm_buf_reset(tb, TPM_TAG_RQU_AUTH2_COMMAND, TPM_ORD_UNSEAL);
tpm_buf_append_u32(tb, keyhandle);
tpm_buf_append(tb, blob, bloblen);
tpm_buf_append_u32(tb, authhandle1);
tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE);
tpm_buf_append_u8(tb, cont);
tpm_buf_append(tb, authdata1, SHA1_DIGEST_SIZE);
tpm_buf_append_u32(tb, authhandle2);
tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE);
tpm_buf_append_u8(tb, cont);
tpm_buf_append(tb, authdata2, SHA1_DIGEST_SIZE);
ret = trusted_tpm_send(tb->data, tb->length);
if (ret < 0) {
pr_info("authhmac failed (%d)\n", ret);
return ret;
}
*datalen = LOAD32(tb->data, TPM_DATA_OFFSET);
ret = TSS_checkhmac2(tb->data, ordinal, nonceodd,
keyauth, SHA1_DIGEST_SIZE,
blobauth, SHA1_DIGEST_SIZE,
sizeof(uint32_t), TPM_DATA_OFFSET,
*datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0,
0);
if (ret < 0) {
pr_info("TSS_checkhmac2 failed (%d)\n", ret);
return ret;
}
memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen);
return 0;
}
/*
* Have the TPM seal(encrypt) the symmetric key
*/
static int key_seal(struct trusted_key_payload *p,
struct trusted_key_options *o)
{
struct tpm_buf tb;
int ret;
ret = tpm_buf_init(&tb, 0, 0);
if (ret)
return ret;
/* include migratable flag at end of sealed key */
p->key[p->key_len] = p->migratable;
ret = tpm_seal(&tb, o->keytype, o->keyhandle, o->keyauth,
p->key, p->key_len + 1, p->blob, &p->blob_len,
o->blobauth, o->pcrinfo, o->pcrinfo_len);
if (ret < 0)
pr_info("srkseal failed (%d)\n", ret);
tpm_buf_destroy(&tb);
return ret;
}
/*
* Have the TPM unseal(decrypt) the symmetric key
*/
static int key_unseal(struct trusted_key_payload *p,
struct trusted_key_options *o)
{
struct tpm_buf tb;
int ret;
ret = tpm_buf_init(&tb, 0, 0);
if (ret)
return ret;
ret = tpm_unseal(&tb, o->keyhandle, o->keyauth, p->blob, p->blob_len,
o->blobauth, p->key, &p->key_len);
if (ret < 0)
pr_info("srkunseal failed (%d)\n", ret);
else
/* pull migratable flag out of sealed key */
p->migratable = p->key[--p->key_len];
tpm_buf_destroy(&tb);
return ret;
}
enum {
Opt_err,
Opt_keyhandle, Opt_keyauth, Opt_blobauth,
Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
Opt_hash,
Opt_policydigest,
Opt_policyhandle,
};
static const match_table_t key_tokens = {
{Opt_keyhandle, "keyhandle=%s"},
{Opt_keyauth, "keyauth=%s"},
{Opt_blobauth, "blobauth=%s"},
{Opt_pcrinfo, "pcrinfo=%s"},
{Opt_pcrlock, "pcrlock=%s"},
{Opt_migratable, "migratable=%s"},
{Opt_hash, "hash=%s"},
{Opt_policydigest, "policydigest=%s"},
{Opt_policyhandle, "policyhandle=%s"},
{Opt_err, NULL}
};
/* can have zero or more token= options */
static int getoptions(char *c, struct trusted_key_payload *pay,
struct trusted_key_options *opt)
{
substring_t args[MAX_OPT_ARGS];
char *p = c;
int token;
int res;
unsigned long handle;
unsigned long lock;
unsigned long token_mask = 0;
unsigned int digest_len;
int i;
int tpm2;
tpm2 = tpm_is_tpm2(chip);
if (tpm2 < 0)
return tpm2;
opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1;
if (!c)
return 0;
while ((p = strsep(&c, " \t"))) {
if (*p == '\0' || *p == ' ' || *p == '\t')
continue;
token = match_token(p, key_tokens, args);
if (test_and_set_bit(token, &token_mask))
return -EINVAL;
switch (token) {
case Opt_pcrinfo:
opt->pcrinfo_len = strlen(args[0].from) / 2;
if (opt->pcrinfo_len > MAX_PCRINFO_SIZE)
return -EINVAL;
res = hex2bin(opt->pcrinfo, args[0].from,
opt->pcrinfo_len);
if (res < 0)
return -EINVAL;
break;
case Opt_keyhandle:
res = kstrtoul(args[0].from, 16, &handle);
if (res < 0)
return -EINVAL;
opt->keytype = SEAL_keytype;
opt->keyhandle = handle;
break;
case Opt_keyauth:
if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
return -EINVAL;
res = hex2bin(opt->keyauth, args[0].from,
SHA1_DIGEST_SIZE);
if (res < 0)
return -EINVAL;
break;
case Opt_blobauth:
/*
* TPM 1.2 authorizations are sha1 hashes passed in as
* hex strings. TPM 2.0 authorizations are simple
* passwords (although it can take a hash as well)
*/
opt->blobauth_len = strlen(args[0].from);
if (opt->blobauth_len == 2 * TPM_DIGEST_SIZE) {
res = hex2bin(opt->blobauth, args[0].from,
TPM_DIGEST_SIZE);
if (res < 0)
return -EINVAL;
opt->blobauth_len = TPM_DIGEST_SIZE;
break;
}
if (tpm2 && opt->blobauth_len <= sizeof(opt->blobauth)) {
memcpy(opt->blobauth, args[0].from,
opt->blobauth_len);
break;
}
return -EINVAL;
break;
case Opt_migratable:
if (*args[0].from == '0')
pay->migratable = 0;
else if (*args[0].from != '1')
return -EINVAL;
break;
case Opt_pcrlock:
res = kstrtoul(args[0].from, 10, &lock);
if (res < 0)
return -EINVAL;
opt->pcrlock = lock;
break;
case Opt_hash:
if (test_bit(Opt_policydigest, &token_mask))
return -EINVAL;
for (i = 0; i < HASH_ALGO__LAST; i++) {
if (!strcmp(args[0].from, hash_algo_name[i])) {
opt->hash = i;
break;
}
}
if (i == HASH_ALGO__LAST)
return -EINVAL;
if (!tpm2 && i != HASH_ALGO_SHA1) {
pr_info("TPM 1.x only supports SHA-1.\n");
return -EINVAL;
}
break;
case Opt_policydigest:
digest_len = hash_digest_size[opt->hash];
if (!tpm2 || strlen(args[0].from) != (2 * digest_len))
return -EINVAL;
res = hex2bin(opt->policydigest, args[0].from,
digest_len);
if (res < 0)
return -EINVAL;
opt->policydigest_len = digest_len;
break;
case Opt_policyhandle:
if (!tpm2)
return -EINVAL;
res = kstrtoul(args[0].from, 16, &handle);
if (res < 0)
return -EINVAL;
opt->policyhandle = handle;
break;
default:
return -EINVAL;
}
}
return 0;
}
static struct trusted_key_options *trusted_options_alloc(void)
{
struct trusted_key_options *options;
int tpm2;
tpm2 = tpm_is_tpm2(chip);
if (tpm2 < 0)
return NULL;
options = kzalloc(sizeof *options, GFP_KERNEL);
if (options) {
/* set any non-zero defaults */
options->keytype = SRK_keytype;
if (!tpm2)
options->keyhandle = SRKHANDLE;
}
return options;
}
static int trusted_tpm_seal(struct trusted_key_payload *p, char *datablob)
{
struct trusted_key_options *options = NULL;
int ret = 0;
int tpm2;
tpm2 = tpm_is_tpm2(chip);
if (tpm2 < 0)
return tpm2;
options = trusted_options_alloc();
if (!options)
return -ENOMEM;
ret = getoptions(datablob, p, options);
if (ret < 0)
goto out;
dump_options(options);
if (!options->keyhandle && !tpm2) {
ret = -EINVAL;
goto out;
}
if (tpm2)
ret = tpm2_seal_trusted(chip, p, options);
else
ret = key_seal(p, options);
if (ret < 0) {
pr_info("key_seal failed (%d)\n", ret);
goto out;
}
if (options->pcrlock) {
ret = pcrlock(options->pcrlock);
if (ret < 0) {
pr_info("pcrlock failed (%d)\n", ret);
goto out;
}
}
out:
kfree_sensitive(options);
return ret;
}
static int trusted_tpm_unseal(struct trusted_key_payload *p, char *datablob)
{
struct trusted_key_options *options = NULL;
int ret = 0;
int tpm2;
tpm2 = tpm_is_tpm2(chip);
if (tpm2 < 0)
return tpm2;
options = trusted_options_alloc();
if (!options)
return -ENOMEM;
ret = getoptions(datablob, p, options);
if (ret < 0)
goto out;
dump_options(options);
if (!options->keyhandle && !tpm2) {
ret = -EINVAL;
goto out;
}
if (tpm2)
ret = tpm2_unseal_trusted(chip, p, options);
else
ret = key_unseal(p, options);
if (ret < 0)
pr_info("key_unseal failed (%d)\n", ret);
if (options->pcrlock) {
ret = pcrlock(options->pcrlock);
if (ret < 0) {
pr_info("pcrlock failed (%d)\n", ret);
goto out;
}
}
out:
kfree_sensitive(options);
return ret;
}
static int trusted_tpm_get_random(unsigned char *key, size_t key_len)
{
return tpm_get_random(chip, key, key_len);
}
static void trusted_shash_release(void)
{
if (hashalg)
crypto_free_shash(hashalg);
if (hmacalg)
crypto_free_shash(hmacalg);
}
static int __init trusted_shash_alloc(void)
{
int ret;
hmacalg = crypto_alloc_shash(hmac_alg, 0, 0);
if (IS_ERR(hmacalg)) {
pr_info("could not allocate crypto %s\n",
hmac_alg);
return PTR_ERR(hmacalg);
}
hashalg = crypto_alloc_shash(hash_alg, 0, 0);
if (IS_ERR(hashalg)) {
pr_info("could not allocate crypto %s\n",
hash_alg);
ret = PTR_ERR(hashalg);
goto hashalg_fail;
}
return 0;
hashalg_fail:
crypto_free_shash(hmacalg);
return ret;
}
static int __init init_digests(void)
{
int i;
digests = kcalloc(chip->nr_allocated_banks, sizeof(*digests),
GFP_KERNEL);
if (!digests)
return -ENOMEM;
for (i = 0; i < chip->nr_allocated_banks; i++)
digests[i].alg_id = chip->allocated_banks[i].alg_id;
return 0;
}
static int __init trusted_tpm_init(void)
{
int ret;
chip = tpm_default_chip();
if (!chip)
return -ENODEV;
ret = init_digests();
if (ret < 0)
goto err_put;
ret = trusted_shash_alloc();
if (ret < 0)
goto err_free;
ret = register_key_type(&key_type_trusted);
if (ret < 0)
goto err_release;
return 0;
err_release:
trusted_shash_release();
err_free:
kfree(digests);
err_put:
put_device(&chip->dev);
return ret;
}
static void trusted_tpm_exit(void)
{
if (chip) {
put_device(&chip->dev);
kfree(digests);
trusted_shash_release();
unregister_key_type(&key_type_trusted);
}
}
struct trusted_key_ops trusted_key_tpm_ops = {
.migratable = 1, /* migratable by default */
.init = trusted_tpm_init,
.seal = trusted_tpm_seal,
.unseal = trusted_tpm_unseal,
.get_random = trusted_tpm_get_random,
.exit = trusted_tpm_exit,
};
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