Commit message: KEYS: Fix handling of stored error in a negatively instantiated user key

If a user key gets negatively instantiated, an error code is cached in the
payload area.  A negatively instantiated key may be then be positively
instantiated by updating it with valid data.  However, the ->update key
type method must be aware that the error code may be there.

The following may be used to trigger the bug in the user key type:

    keyctl request2 user user "" @u
    keyctl add user user "a" @u

which manifests itself as:

	BUG: unable to handle kernel paging request at 00000000ffffff8a
	IP: [<ffffffff810a376f>] __call_rcu.constprop.76+0x1f/0x280 kernel/rcu/tree.c:3046
	PGD 7cc30067 PUD 0
	Oops: 0002 [#1] SMP
	Modules linked in:
	CPU: 3 PID: 2644 Comm: a.out Not tainted 4.3.0+ #49
	Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
	task: ffff88003ddea700 ti: ffff88003dd88000 task.ti: ffff88003dd88000
	RIP: 0010:[<ffffffff810a376f>]  [<ffffffff810a376f>] __call_rcu.constprop.76+0x1f/0x280
	 [<ffffffff810a376f>] __call_rcu.constprop.76+0x1f/0x280 kernel/rcu/tree.c:3046
	RSP: 0018:ffff88003dd8bdb0  EFLAGS: 00010246
	RAX: 00000000ffffff82 RBX: 0000000000000000 RCX: 0000000000000001
	RDX: ffffffff81e3fe40 RSI: 0000000000000000 RDI: 00000000ffffff82
	RBP: ffff88003dd8bde0 R08: ffff88007d2d2da0 R09: 0000000000000000
	R10: 0000000000000000 R11: ffff88003e8073c0 R12: 00000000ffffff82
	R13: ffff88003dd8be68 R14: ffff88007d027600 R15: ffff88003ddea700
	FS:  0000000000b92880(0063) GS:ffff88007fd00000(0000) knlGS:0000000000000000
	CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
	CR2: 00000000ffffff8a CR3: 000000007cc5f000 CR4: 00000000000006e0
	Stack:
	 ffff88003dd8bdf0 ffffffff81160a8a 0000000000000000 00000000ffffff82
	 ffff88003dd8be68 ffff88007d027600 ffff88003dd8bdf0 ffffffff810a39e5
	 ffff88003dd8be20 ffffffff812a31ab ffff88007d027600 ffff88007d027620
	Call Trace:
	 [<ffffffff810a39e5>] kfree_call_rcu+0x15/0x20 kernel/rcu/tree.c:3136
	 [<ffffffff812a31ab>] user_update+0x8b/0xb0 security/keys/user_defined.c:129
	 [<     inline     >] __key_update security/keys/key.c:730
	 [<ffffffff8129e5c1>] key_create_or_update+0x291/0x440 security/keys/key.c:908
	 [<     inline     >] SYSC_add_key security/keys/keyctl.c:125
	 [<ffffffff8129fc21>] SyS_add_key+0x101/0x1e0 security/keys/keyctl.c:60
	 [<ffffffff8185f617>] entry_SYSCALL_64_fastpath+0x12/0x6a arch/x86/entry/entry_64.S:185

Note the error code (-ENOKEY) in EDX.

A similar bug can be tripped by:

    keyctl request2 trusted user "" @u
    keyctl add trusted user "a" @u

This should also affect encrypted keys - but that has to be correctly
parameterised or it will fail with EINVAL before getting to the bit that
will crashes.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
CVE: CVE-2015-8539
CWE: CWE-264
Vulnerability description: The KEYS subsystem in the Linux kernel before 4.4 allows local users to gain privileges or cause a denial of service (BUG) via crafted keyctl commands that negatively instantiate a key, related to security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c, and security/keys/user_defined.c.

Project: linux
File: encrypted.c

static void __ekey_init(struct encrypted_key_payload *epayload,
			const char *format, const char *master_desc,
			const char *datalen)
{
	unsigned int format_len;

	format_len = (!format) ? strlen(key_format_default) : strlen(format);
	epayload->format = epayload->payload_data + epayload->payload_datalen;
	epayload->master_desc = epayload->format + format_len + 1;
	epayload->datalen = epayload->master_desc + strlen(master_desc) + 1;
	epayload->iv = epayload->datalen + strlen(datalen) + 1;
	epayload->encrypted_data = epayload->iv + ivsize + 1;
	epayload->decrypted_data = epayload->payload_data;

	if (!format)
		memcpy(epayload->format, key_format_default, format_len);
	else {
		if (!strcmp(format, key_format_ecryptfs))
			epayload->decrypted_data =
				ecryptfs_get_auth_tok_key((struct ecryptfs_auth_tok *)epayload->payload_data);

		memcpy(epayload->format, format, format_len);
	}

	memcpy(epayload->master_desc, master_desc, strlen(master_desc));
	memcpy(epayload->datalen, datalen, strlen(datalen));
}

Project: linux
File: encrypted.c

static int aes_get_sizes(void)
{
	struct crypto_blkcipher *tfm;

	tfm = crypto_alloc_blkcipher(blkcipher_alg, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(tfm)) {
		pr_err("encrypted_key: failed to alloc_cipher (%ld)\n",
		       PTR_ERR(tfm));
		return PTR_ERR(tfm);
	}
	ivsize = crypto_blkcipher_ivsize(tfm);
	blksize = crypto_blkcipher_blocksize(tfm);
	crypto_free_blkcipher(tfm);
	return 0;
}

Project: linux
File: encrypted.c

static struct sdesc *alloc_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;
	sdesc->shash.flags = 0x0;
	return sdesc;
}

Project: linux
File: encrypted.c

static void __exit cleanup_encrypted(void)
{
	encrypted_shash_release();
	unregister_key_type(&key_type_encrypted);
}

Project: linux
File: encrypted.c

static char *datablob_format(struct encrypted_key_payload *epayload,
			     size_t asciiblob_len)
{
	char *ascii_buf, *bufp;
	u8 *iv = epayload->iv;
	int len;
	int i;

	ascii_buf = kmalloc(asciiblob_len + 1, GFP_KERNEL);
	if (!ascii_buf)
		goto out;

	ascii_buf[asciiblob_len] = '\0';

	/* copy datablob master_desc and datalen strings */
	len = sprintf(ascii_buf, "%s %s %s ", epayload->format,
		      epayload->master_desc, epayload->datalen);

	/* convert the hex encoded iv, encrypted-data and HMAC to ascii */
	bufp = &ascii_buf[len];
	for (i = 0; i < (asciiblob_len - len) / 2; i++)
		bufp = hex_byte_pack(bufp, iv[i]);
out:
	return ascii_buf;
}

Project: linux
File: encrypted.c

static int datablob_hmac_append(struct encrypted_key_payload *epayload,
				const u8 *master_key, size_t master_keylen)
{
	u8 derived_key[HASH_SIZE];
	u8 *digest;
	int ret;

	ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen);
	if (ret < 0)
		goto out;

	digest = epayload->format + epayload->datablob_len;
	ret = calc_hmac(digest, derived_key, sizeof derived_key,
			epayload->format, epayload->datablob_len);
	if (!ret)
		dump_hmac(NULL, digest, HASH_SIZE);
out:
	return ret;
}

Project: linux
File: encrypted.c

static int datablob_parse(char *datablob, const char **format,
			  char **master_desc, char **decrypted_datalen,
			  char **hex_encoded_iv)
{
	substring_t args[MAX_OPT_ARGS];
	int ret = -EINVAL;
	int key_cmd;
	int key_format;
	char *p, *keyword;

	keyword = strsep(&datablob, " \t");
	if (!keyword) {
		pr_info("encrypted_key: insufficient parameters specified\n");
		return ret;
	}
	key_cmd = match_token(keyword, key_tokens, args);

	/* Get optional format: default | ecryptfs */
	p = strsep(&datablob, " \t");
	if (!p) {
		pr_err("encrypted_key: insufficient parameters specified\n");
		return ret;
	}

	key_format = match_token(p, key_format_tokens, args);
	switch (key_format) {
	case Opt_ecryptfs:
	case Opt_default:
		*format = p;
		*master_desc = strsep(&datablob, " \t");
		break;
	case Opt_error:
		*master_desc = p;
		break;
	}

	if (!*master_desc) {
		pr_info("encrypted_key: master key parameter is missing\n");
		goto out;
	}

	if (valid_master_desc(*master_desc, NULL) < 0) {
		pr_info("encrypted_key: master key parameter \'%s\' "
			"is invalid\n", *master_desc);
		goto out;
	}

	if (decrypted_datalen) {
		*decrypted_datalen = strsep(&datablob, " \t");
		if (!*decrypted_datalen) {
			pr_info("encrypted_key: keylen parameter is missing\n");
			goto out;
		}
	}

	switch (key_cmd) {
	case Opt_new:
		if (!decrypted_datalen) {
			pr_info("encrypted_key: keyword \'%s\' not allowed "
				"when called from .update method\n", keyword);
			break;
		}
		ret = 0;
		break;
	case Opt_load:
		if (!decrypted_datalen) {
			pr_info("encrypted_key: keyword \'%s\' not allowed "
				"when called from .update method\n", keyword);
			break;
		}
		*hex_encoded_iv = strsep(&datablob, " \t");
		if (!*hex_encoded_iv) {
			pr_info("encrypted_key: hex blob is missing\n");
			break;
		}
		ret = 0;
		break;
	case Opt_update:
		if (decrypted_datalen) {
			pr_info("encrypted_key: keyword \'%s\' not allowed "
				"when called from .instantiate method\n",
				keyword);
			break;
		}
		ret = 0;
		break;
	case Opt_err:
		pr_info("encrypted_key: keyword \'%s\' not recognized\n",
			keyword);
		break;
	}
out:
	return ret;
}

Project: linux
File: encrypted.c

static int derived_key_decrypt(struct encrypted_key_payload *epayload,
			       const u8 *derived_key,
			       unsigned int derived_keylen)
{
	struct scatterlist sg_in[1];
	struct scatterlist sg_out[2];
	struct blkcipher_desc desc;
	unsigned int encrypted_datalen;
	char pad[16];
	int ret;

	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);
	ret = init_blkcipher_desc(&desc, derived_key, derived_keylen,
				  epayload->iv, ivsize);
	if (ret < 0)
		goto out;
	dump_encrypted_data(epayload, encrypted_datalen);

	memset(pad, 0, sizeof pad);
	sg_init_table(sg_in, 1);
	sg_init_table(sg_out, 2);
	sg_set_buf(sg_in, epayload->encrypted_data, encrypted_datalen);
	sg_set_buf(&sg_out[0], epayload->decrypted_data,
		   epayload->decrypted_datalen);
	sg_set_buf(&sg_out[1], pad, sizeof pad);

	ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, encrypted_datalen);
	crypto_free_blkcipher(desc.tfm);
	if (ret < 0)
		goto out;
	dump_decrypted_data(epayload);
out:
	return ret;
}

Project: linux
File: encrypted.c

static int derived_key_encrypt(struct encrypted_key_payload *epayload,
			       const u8 *derived_key,
			       unsigned int derived_keylen)
{
	struct scatterlist sg_in[2];
	struct scatterlist sg_out[1];
	struct blkcipher_desc desc;
	unsigned int encrypted_datalen;
	unsigned int padlen;
	char pad[16];
	int ret;

	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);
	padlen = encrypted_datalen - epayload->decrypted_datalen;

	ret = init_blkcipher_desc(&desc, derived_key, derived_keylen,
				  epayload->iv, ivsize);
	if (ret < 0)
		goto out;
	dump_decrypted_data(epayload);

	memset(pad, 0, sizeof pad);
	sg_init_table(sg_in, 2);
	sg_set_buf(&sg_in[0], epayload->decrypted_data,
		   epayload->decrypted_datalen);
	sg_set_buf(&sg_in[1], pad, padlen);

	sg_init_table(sg_out, 1);
	sg_set_buf(sg_out, epayload->encrypted_data, encrypted_datalen);

	ret = crypto_blkcipher_encrypt(&desc, sg_out, sg_in, encrypted_datalen);
	crypto_free_blkcipher(desc.tfm);
	if (ret < 0)
		pr_err("encrypted_key: failed to encrypt (%d)\n", ret);
	else
		dump_encrypted_data(epayload, encrypted_datalen);
out:
	return ret;
}

Project: linux
File: encrypted.c

static int encrypted_init(struct encrypted_key_payload *epayload,
			  const char *key_desc, const char *format,
			  const char *master_desc, const char *datalen,
			  const char *hex_encoded_iv)
{
	int ret = 0;

	if (format && !strcmp(format, key_format_ecryptfs)) {
		ret = valid_ecryptfs_desc(key_desc);
		if (ret < 0)
			return ret;

		ecryptfs_fill_auth_tok((struct ecryptfs_auth_tok *)epayload->payload_data,
				       key_desc);
	}

	__ekey_init(epayload, format, master_desc, datalen);
	if (!hex_encoded_iv) {
		get_random_bytes(epayload->iv, ivsize);

		get_random_bytes(epayload->decrypted_data,
				 epayload->decrypted_datalen);
	} else
		ret = encrypted_key_decrypt(epayload, format, hex_encoded_iv);
	return ret;
}

Project: linux
File: encrypted.c

static int encrypted_instantiate(struct key *key,
				 struct key_preparsed_payload *prep)
{
	struct encrypted_key_payload *epayload = NULL;
	char *datablob = NULL;
	const char *format = NULL;
	char *master_desc = NULL;
	char *decrypted_datalen = NULL;
	char *hex_encoded_iv = NULL;
	size_t datalen = prep->datalen;
	int ret;

	if (datalen <= 0 || datalen > 32767 || !prep->data)
		return -EINVAL;

	datablob = kmalloc(datalen + 1, GFP_KERNEL);
	if (!datablob)
		return -ENOMEM;
	datablob[datalen] = 0;
	memcpy(datablob, prep->data, datalen);
	ret = datablob_parse(datablob, &format, &master_desc,
			     &decrypted_datalen, &hex_encoded_iv);
	if (ret < 0)
		goto out;

	epayload = encrypted_key_alloc(key, format, master_desc,
				       decrypted_datalen);
	if (IS_ERR(epayload)) {
		ret = PTR_ERR(epayload);
		goto out;
	}
	ret = encrypted_init(epayload, key->description, format, master_desc,
			     decrypted_datalen, hex_encoded_iv);
	if (ret < 0) {
		kfree(epayload);
		goto out;
	}

	rcu_assign_keypointer(key, epayload);
out:
	kfree(datablob);
	return ret;
}

Project: linux
File: encrypted.c

static struct encrypted_key_payload *encrypted_key_alloc(struct key *key,
							 const char *format,
							 const char *master_desc,
							 const char *datalen)
{
	struct encrypted_key_payload *epayload = NULL;
	unsigned short datablob_len;
	unsigned short decrypted_datalen;
	unsigned short payload_datalen;
	unsigned int encrypted_datalen;
	unsigned int format_len;
	long dlen;
	int ret;

	ret = kstrtol(datalen, 10, &dlen);
	if (ret < 0 || dlen < MIN_DATA_SIZE || dlen > MAX_DATA_SIZE)
		return ERR_PTR(-EINVAL);

	format_len = (!format) ? strlen(key_format_default) : strlen(format);
	decrypted_datalen = dlen;
	payload_datalen = decrypted_datalen;
	if (format && !strcmp(format, key_format_ecryptfs)) {
		if (dlen != ECRYPTFS_MAX_KEY_BYTES) {
			pr_err("encrypted_key: keylen for the ecryptfs format "
			       "must be equal to %d bytes\n",
			       ECRYPTFS_MAX_KEY_BYTES);
			return ERR_PTR(-EINVAL);
		}
		decrypted_datalen = ECRYPTFS_MAX_KEY_BYTES;
		payload_datalen = sizeof(struct ecryptfs_auth_tok);
	}

	encrypted_datalen = roundup(decrypted_datalen, blksize);

	datablob_len = format_len + 1 + strlen(master_desc) + 1
	    + strlen(datalen) + 1 + ivsize + 1 + encrypted_datalen;

	ret = key_payload_reserve(key, payload_datalen + datablob_len
				  + HASH_SIZE + 1);
	if (ret < 0)
		return ERR_PTR(ret);

	epayload = kzalloc(sizeof(*epayload) + payload_datalen +
			   datablob_len + HASH_SIZE + 1, GFP_KERNEL);
	if (!epayload)
		return ERR_PTR(-ENOMEM);

	epayload->payload_datalen = payload_datalen;
	epayload->decrypted_datalen = decrypted_datalen;
	epayload->datablob_len = datablob_len;
	return epayload;
}

Project: linux
File: encrypted.c

static int encrypted_key_decrypt(struct encrypted_key_payload *epayload,
				 const char *format, const char *hex_encoded_iv)
{
	struct key *mkey;
	u8 derived_key[HASH_SIZE];
	const u8 *master_key;
	u8 *hmac;
	const char *hex_encoded_data;
	unsigned int encrypted_datalen;
	size_t master_keylen;
	size_t asciilen;
	int ret;

	encrypted_datalen = roundup(epayload->decrypted_datalen, blksize);
	asciilen = (ivsize + 1 + encrypted_datalen + HASH_SIZE) * 2;
	if (strlen(hex_encoded_iv) != asciilen)
		return -EINVAL;

	hex_encoded_data = hex_encoded_iv + (2 * ivsize) + 2;
	ret = hex2bin(epayload->iv, hex_encoded_iv, ivsize);
	if (ret < 0)
		return -EINVAL;
	ret = hex2bin(epayload->encrypted_data, hex_encoded_data,
		      encrypted_datalen);
	if (ret < 0)
		return -EINVAL;

	hmac = epayload->format + epayload->datablob_len;
	ret = hex2bin(hmac, hex_encoded_data + (encrypted_datalen * 2),
		      HASH_SIZE);
	if (ret < 0)
		return -EINVAL;

	mkey = request_master_key(epayload, &master_key, &master_keylen);
	if (IS_ERR(mkey))
		return PTR_ERR(mkey);

	ret = datablob_hmac_verify(epayload, format, master_key, master_keylen);
	if (ret < 0) {
		pr_err("encrypted_key: bad hmac (%d)\n", ret);
		goto out;
	}

	ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen);
	if (ret < 0)
		goto out;

	ret = derived_key_decrypt(epayload, derived_key, sizeof derived_key);
	if (ret < 0)
		pr_err("encrypted_key: failed to decrypt key (%d)\n", ret);
out:
	up_read(&mkey->sem);
	key_put(mkey);
	return ret;
}

Project: linux
File: encrypted.c

static void encrypted_rcu_free(struct rcu_head *rcu)
{
	struct encrypted_key_payload *epayload;

	epayload = container_of(rcu, struct encrypted_key_payload, rcu);
	memset(epayload->decrypted_data, 0, epayload->decrypted_datalen);
	kfree(epayload);
}

Project: linux
File: encrypted.c

static long encrypted_read(const struct key *key, char __user *buffer,
			   size_t buflen)
{
	struct encrypted_key_payload *epayload;
	struct key *mkey;
	const u8 *master_key;
	size_t master_keylen;
	char derived_key[HASH_SIZE];
	char *ascii_buf;
	size_t asciiblob_len;
	int ret;

	epayload = rcu_dereference_key(key);

	/* returns the hex encoded iv, encrypted-data, and hmac as ascii */
	asciiblob_len = epayload->datablob_len + ivsize + 1
	    + roundup(epayload->decrypted_datalen, blksize)
	    + (HASH_SIZE * 2);

	if (!buffer || buflen < asciiblob_len)
		return asciiblob_len;

	mkey = request_master_key(epayload, &master_key, &master_keylen);
	if (IS_ERR(mkey))
		return PTR_ERR(mkey);

	ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen);
	if (ret < 0)
		goto out;

	ret = derived_key_encrypt(epayload, derived_key, sizeof derived_key);
	if (ret < 0)
		goto out;

	ret = datablob_hmac_append(epayload, master_key, master_keylen);
	if (ret < 0)
		goto out;

	ascii_buf = datablob_format(epayload, asciiblob_len);
	if (!ascii_buf) {
		ret = -ENOMEM;
		goto out;
	}

	up_read(&mkey->sem);
	key_put(mkey);

	if (copy_to_user(buffer, ascii_buf, asciiblob_len) != 0)
		ret = -EFAULT;
	kfree(ascii_buf);

	return asciiblob_len;
out:
	up_read(&mkey->sem);
	key_put(mkey);
	return ret;
}

Project: linux
File: encrypted.c

static int __init encrypted_shash_alloc(void)
{
	int ret;

	hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(hmacalg)) {
		pr_info("encrypted_key: could not allocate crypto %s\n",
			hmac_alg);
		return PTR_ERR(hmacalg);
	}

	hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(hashalg)) {
		pr_info("encrypted_key: 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;
}

Project: linux
File: encrypted.c

static void encrypted_shash_release(void)
{
	if (hashalg)
		crypto_free_shash(hashalg);
	if (hmacalg)
		crypto_free_shash(hmacalg);
}

Project: linux
File: encrypted.c

static int __init init_encrypted(void)
{
	int ret;

	ret = encrypted_shash_alloc();
	if (ret < 0)
		return ret;
	ret = aes_get_sizes();
	if (ret < 0)
		goto out;
	ret = register_key_type(&key_type_encrypted);
	if (ret < 0)
		goto out;
	return 0;
out:
	encrypted_shash_release();
	return ret;

}

Project: linux
File: encrypted.c

static struct key *request_master_key(struct encrypted_key_payload *epayload,
				      const u8 **master_key, size_t *master_keylen)
{
	struct key *mkey = NULL;

	if (!strncmp(epayload->master_desc, KEY_TRUSTED_PREFIX,
		     KEY_TRUSTED_PREFIX_LEN)) {
		mkey = request_trusted_key(epayload->master_desc +
					   KEY_TRUSTED_PREFIX_LEN,
					   master_key, master_keylen);
	} else if (!strncmp(epayload->master_desc, KEY_USER_PREFIX,
			    KEY_USER_PREFIX_LEN)) {
		mkey = request_user_key(epayload->master_desc +
					KEY_USER_PREFIX_LEN,
					master_key, master_keylen);
	} else
		goto out;

	if (IS_ERR(mkey)) {
		int ret = PTR_ERR(mkey);

		if (ret == -ENOTSUPP)
			pr_info("encrypted_key: key %s not supported",
				epayload->master_desc);
		else
			pr_info("encrypted_key: key %s not found",
				epayload->master_desc);
		goto out;
	}

	dump_master_key(*master_key, *master_keylen);
out:
	return mkey;
}

Project: linux
File: encrypted.c

static struct key *request_user_key(const char *master_desc, const u8 **master_key,
				    size_t *master_keylen)
{
	const struct user_key_payload *upayload;
	struct key *ukey;

	ukey = request_key(&key_type_user, master_desc, NULL);
	if (IS_ERR(ukey))
		goto error;

	down_read(&ukey->sem);
	upayload = user_key_payload(ukey);
	*master_key = upayload->data;
	*master_keylen = upayload->datalen;
error:
	return ukey;
}

Project: linux
File: encrypted.c

static int valid_ecryptfs_desc(const char *ecryptfs_desc)
{
	int i;

	if (strlen(ecryptfs_desc) != KEY_ECRYPTFS_DESC_LEN) {
		pr_err("encrypted_key: key description must be %d hexadecimal "
		       "characters long\n", KEY_ECRYPTFS_DESC_LEN);
		return -EINVAL;
	}

	for (i = 0; i < KEY_ECRYPTFS_DESC_LEN; i++) {
		if (!isxdigit(ecryptfs_desc[i])) {
			pr_err("encrypted_key: key description must contain "
			       "only hexadecimal characters\n");
			return -EINVAL;
		}
	}

	return 0;
}

Project: linux
File: encrypted.c

static int valid_master_desc(const char *new_desc, const char *orig_desc)
{
	if (!memcmp(new_desc, KEY_TRUSTED_PREFIX, KEY_TRUSTED_PREFIX_LEN)) {
		if (strlen(new_desc) == KEY_TRUSTED_PREFIX_LEN)
			goto out;
		if (orig_desc)
			if (memcmp(new_desc, orig_desc, KEY_TRUSTED_PREFIX_LEN))
				goto out;
	} else if (!memcmp(new_desc, KEY_USER_PREFIX, KEY_USER_PREFIX_LEN)) {
		if (strlen(new_desc) == KEY_USER_PREFIX_LEN)
			goto out;
		if (orig_desc)
			if (memcmp(new_desc, orig_desc, KEY_USER_PREFIX_LEN))
				goto out;
	} else
		goto out;
	return 0;
out:
	return -EINVAL;
}

Project: linux
File: trusted.c

static 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;

	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("trusted_key: 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(sdesc);
	return ret;
}

Project: linux
File: trusted.c

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("trusted_key: can't alloc %s\n", hash_alg);
		return PTR_ERR(sdesc);
	}

	ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest);
	kfree(sdesc);
	return ret;
}

Project: linux
File: trusted.c

static void __exit cleanup_trusted(void)
{
	trusted_shash_release();
	unregister_key_type(&key_type_trusted);
}

Project: linux
File: trusted.c

static int datablob_parse(char *datablob, struct trusted_key_payload *p,
			  struct trusted_key_options *o)
{
	substring_t args[MAX_OPT_ARGS];
	long keylen;
	int ret = -EINVAL;
	int key_cmd;
	char *c;

	/* main command */
	c = strsep(&datablob, " \t");
	if (!c)
		return -EINVAL;
	key_cmd = match_token(c, key_tokens, args);
	switch (key_cmd) {
	case Opt_new:
		/* first argument is key size */
		c = strsep(&datablob, " \t");
		if (!c)
			return -EINVAL;
		ret = kstrtol(c, 10, &keylen);
		if (ret < 0 || keylen < MIN_KEY_SIZE || keylen > MAX_KEY_SIZE)
			return -EINVAL;
		p->key_len = keylen;
		ret = getoptions(datablob, p, o);
		if (ret < 0)
			return ret;
		ret = Opt_new;
		break;
	case Opt_load:
		/* first argument is sealed blob */
		c = strsep(&datablob, " \t");
		if (!c)
			return -EINVAL;
		p->blob_len = strlen(c) / 2;
		if (p->blob_len > MAX_BLOB_SIZE)
			return -EINVAL;
		ret = hex2bin(p->blob, c, p->blob_len);
		if (ret < 0)
			return -EINVAL;
		ret = getoptions(datablob, p, o);
		if (ret < 0)
			return ret;
		ret = Opt_load;
		break;
	case Opt_update:
		/* all arguments are options */
		ret = getoptions(datablob, p, o);
		if (ret < 0)
			return ret;
		ret = Opt_update;
		break;
	case Opt_err:
		return -EINVAL;
		break;
	}
	return ret;
}

Project: linux
File: trusted.c

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;

	while ((p = strsep(&c, " \t"))) {
		if (*p == '\0' || *p == ' ' || *p == '\t')
			continue;
		token = match_token(p, key_tokens, args);

		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:
			if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
				return -EINVAL;
			res = hex2bin(opt->blobauth, args[0].from,
				      SHA1_DIGEST_SIZE);
			if (res < 0)
				return -EINVAL;
			break;
		case Opt_migratable:
			if (*args[0].from == '0')
				pay->migratable = 0;
			else
				return -EINVAL;
			break;
		case Opt_pcrlock:
			res = kstrtoul(args[0].from, 10, &lock);
			if (res < 0)
				return -EINVAL;
			opt->pcrlock = lock;
			break;
		default:
			return -EINVAL;
		}
	}
	return 0;
}

Project: linux
File: trusted.c

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;
	sdesc->shash.flags = 0x0;
	return sdesc;
}

Project: linux
File: trusted.c

static int __init init_trusted(void)
{
	int ret;

	ret = trusted_shash_alloc();
	if (ret < 0)
		return ret;
	ret = register_key_type(&key_type_trusted);
	if (ret < 0)
		trusted_shash_release();
	return ret;
}

Project: linux
File: trusted.c

static int key_seal(struct trusted_key_payload *p,
		    struct trusted_key_options *o)
{
	struct tpm_buf *tb;
	int ret;

	tb = kzalloc(sizeof *tb, GFP_KERNEL);
	if (!tb)
		return -ENOMEM;

	/* 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("trusted_key: srkseal failed (%d)\n", ret);

	kfree(tb);
	return ret;
}

Project: linux
File: trusted.c

static int key_unseal(struct trusted_key_payload *p,
		      struct trusted_key_options *o)
{
	struct tpm_buf *tb;
	int ret;

	tb = kzalloc(sizeof *tb, GFP_KERNEL);
	if (!tb)
		return -ENOMEM;

	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("trusted_key: srkunseal failed (%d)\n", ret);
	else
		/* pull migratable flag out of sealed key */
		p->migratable = p->key[--p->key_len];

	kfree(tb);
	return ret;
}

Project: linux
File: trusted.c

static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
{
	int ret;

	INIT_BUF(tb);
	store16(tb, TPM_TAG_RQU_COMMAND);
	store32(tb, TPM_OIAP_SIZE);
	store32(tb, TPM_ORD_OIAP);
	ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
	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;
}

Project: linux
File: trusted.c

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(TPM_ANY_NUM, ononce, TPM_NONCE_SIZE);
	if (ret != TPM_NONCE_SIZE)
		return ret;

	INIT_BUF(tb);
	store16(tb, TPM_TAG_RQU_COMMAND);
	store32(tb, TPM_OSAP_SIZE);
	store32(tb, TPM_ORD_OSAP);
	store16(tb, type);
	store32(tb, handle);
	storebytes(tb, ononce, TPM_NONCE_SIZE);

	ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
	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);
}

Project: linux
File: trusted.c

static int pcrlock(const int pcrnum)
{
	unsigned char hash[SHA1_DIGEST_SIZE];
	int ret;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	ret = tpm_get_random(TPM_ANY_NUM, hash, SHA1_DIGEST_SIZE);
	if (ret != SHA1_DIGEST_SIZE)
		return ret;
	return tpm_pcr_extend(TPM_ANY_NUM, pcrnum, hash) ? -EINVAL : 0;
}

Project: linux
File: trusted.c

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(TPM_ANY_NUM, td->nonceodd, TPM_NONCE_SIZE);
	if (ret != TPM_NONCE_SIZE)
		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 */
	INIT_BUF(tb);
	store16(tb, TPM_TAG_RQU_AUTH1_COMMAND);
	store32(tb, TPM_SEAL_SIZE + pcrinfosize + datalen);
	store32(tb, TPM_ORD_SEAL);
	store32(tb, keyhandle);
	storebytes(tb, td->encauth, SHA1_DIGEST_SIZE);
	store32(tb, pcrinfosize);
	storebytes(tb, pcrinfo, pcrinfosize);
	store32(tb, datalen);
	storebytes(tb, data, datalen);
	store32(tb, sess.handle);
	storebytes(tb, td->nonceodd, TPM_NONCE_SIZE);
	store8(tb, cont);
	storebytes(tb, td->pubauth, SHA1_DIGEST_SIZE);

	ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
	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(td);
	return ret;
}

Project: linux
File: trusted.c

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;
	uint32_t keyhndl;
	int ret;

	/* sessions for unsealing key and data */
	ret = oiap(tb, &authhandle1, enonce1);
	if (ret < 0) {
		pr_info("trusted_key: oiap failed (%d)\n", ret);
		return ret;
	}
	ret = oiap(tb, &authhandle2, enonce2);
	if (ret < 0) {
		pr_info("trusted_key: oiap failed (%d)\n", ret);
		return ret;
	}

	ordinal = htonl(TPM_ORD_UNSEAL);
	keyhndl = htonl(SRKHANDLE);
	ret = tpm_get_random(TPM_ANY_NUM, nonceodd, TPM_NONCE_SIZE);
	if (ret != TPM_NONCE_SIZE) {
		pr_info("trusted_key: tpm_get_random failed (%d)\n", ret);
		return ret;
	}
	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 */
	INIT_BUF(tb);
	store16(tb, TPM_TAG_RQU_AUTH2_COMMAND);
	store32(tb, TPM_UNSEAL_SIZE + bloblen);
	store32(tb, TPM_ORD_UNSEAL);
	store32(tb, keyhandle);
	storebytes(tb, blob, bloblen);
	store32(tb, authhandle1);
	storebytes(tb, nonceodd, TPM_NONCE_SIZE);
	store8(tb, cont);
	storebytes(tb, authdata1, SHA1_DIGEST_SIZE);
	store32(tb, authhandle2);
	storebytes(tb, nonceodd, TPM_NONCE_SIZE);
	store8(tb, cont);
	storebytes(tb, authdata2, SHA1_DIGEST_SIZE);

	ret = trusted_tpm_send(TPM_ANY_NUM, tb->data, MAX_BUF_SIZE);
	if (ret < 0) {
		pr_info("trusted_key: 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("trusted_key: TSS_checkhmac2 failed (%d)\n", ret);
		return ret;
	}
	memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen);
	return 0;
}

Project: linux
File: trusted.c

static void trusted_destroy(struct key *key)
{
	struct trusted_key_payload *p = key->payload.data[0];

	if (!p)
		return;
	memset(p->key, 0, p->key_len);
	kfree(key->payload.data[0]);
}

Project: linux
File: trusted.c

static int trusted_instantiate(struct key *key,
			       struct key_preparsed_payload *prep)
{
	struct trusted_key_payload *payload = NULL;
	struct trusted_key_options *options = NULL;
	size_t datalen = prep->datalen;
	char *datablob;
	int ret = 0;
	int key_cmd;
	size_t key_len;
	int tpm2;

	tpm2 = tpm_is_tpm2(TPM_ANY_NUM);
	if (tpm2 < 0)
		return tpm2;

	if (datalen <= 0 || datalen > 32767 || !prep->data)
		return -EINVAL;

	datablob = kmalloc(datalen + 1, GFP_KERNEL);
	if (!datablob)
		return -ENOMEM;
	memcpy(datablob, prep->data, datalen);
	datablob[datalen] = '\0';

	options = trusted_options_alloc();
	if (!options) {
		ret = -ENOMEM;
		goto out;
	}
	payload = trusted_payload_alloc(key);
	if (!payload) {
		ret = -ENOMEM;
		goto out;
	}

	key_cmd = datablob_parse(datablob, payload, options);
	if (key_cmd < 0) {
		ret = key_cmd;
		goto out;
	}

	if (!options->keyhandle) {
		ret = -EINVAL;
		goto out;
	}

	dump_payload(payload);
	dump_options(options);

	switch (key_cmd) {
	case Opt_load:
		if (tpm2)
			ret = tpm_unseal_trusted(TPM_ANY_NUM, payload, options);
		else
			ret = key_unseal(payload, options);
		dump_payload(payload);
		dump_options(options);
		if (ret < 0)
			pr_info("trusted_key: key_unseal failed (%d)\n", ret);
		break;
	case Opt_new:
		key_len = payload->key_len;
		ret = tpm_get_random(TPM_ANY_NUM, payload->key, key_len);
		if (ret != key_len) {
			pr_info("trusted_key: key_create failed (%d)\n", ret);
			goto out;
		}
		if (tpm2)
			ret = tpm_seal_trusted(TPM_ANY_NUM, payload, options);
		else
			ret = key_seal(payload, options);
		if (ret < 0)
			pr_info("trusted_key: key_seal failed (%d)\n", ret);
		break;
	default:
		ret = -EINVAL;
		goto out;
	}
	if (!ret && options->pcrlock)
		ret = pcrlock(options->pcrlock);
out:
	kfree(datablob);
	kfree(options);
	if (!ret)
		rcu_assign_keypointer(key, payload);
	else
		kfree(payload);
	return ret;
}

Project: linux
File: trusted.c

static struct trusted_key_options *trusted_options_alloc(void)
{
	struct trusted_key_options *options;
	int tpm2;

	tpm2 = tpm_is_tpm2(TPM_ANY_NUM);
	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;
}

Project: linux
File: trusted.c

static struct trusted_key_payload *trusted_payload_alloc(struct key *key)
{
	struct trusted_key_payload *p = NULL;
	int ret;

	ret = key_payload_reserve(key, sizeof *p);
	if (ret < 0)
		return p;
	p = kzalloc(sizeof *p, GFP_KERNEL);
	if (p)
		p->migratable = 1; /* migratable by default */
	return p;
}

Project: linux
File: trusted.c

static void trusted_rcu_free(struct rcu_head *rcu)
{
	struct trusted_key_payload *p;

	p = container_of(rcu, struct trusted_key_payload, rcu);
	memset(p->key, 0, p->key_len);
	kfree(p);
}

Project: linux
File: trusted.c

static int __init trusted_shash_alloc(void)
{
	int ret;

	hmacalg = crypto_alloc_shash(hmac_alg, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(hmacalg)) {
		pr_info("trusted_key: could not allocate crypto %s\n",
			hmac_alg);
		return PTR_ERR(hmacalg);
	}

	hashalg = crypto_alloc_shash(hash_alg, 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(hashalg)) {
		pr_info("trusted_key: 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;
}

Project: linux
File: trusted.c

static int trusted_tpm_send(const u32 chip_num, unsigned char *cmd,
			    size_t buflen)
{
	int rc;

	dump_tpm_buf(cmd);
	rc = tpm_send(chip_num, cmd, buflen);
	dump_tpm_buf(cmd);
	if (rc > 0)
		/* Can't return positive return codes values to keyctl */
		rc = -EPERM;
	return rc;
}

Project: linux
File: user_defined.c

static int logon_vet_description(const char *desc)
{
	char *p;

	/* require a "qualified" description string */
	p = strchr(desc, ':');
	if (!p)
		return -EINVAL;

	/* also reject description with ':' as first char */
	if (p == desc)
		return -EINVAL;

	return 0;
}

Project: linux
File: user_defined.c

void user_destroy(struct key *key)
{
	struct user_key_payload *upayload = key->payload.data[0];

	kfree(upayload);
}

Project: linux
File: user_defined.c

void user_free_preparse(struct key_preparsed_payload *prep)
{
	kfree(prep->payload.data[0]);
}

Project: linux
File: user_defined.c

int user_preparse(struct key_preparsed_payload *prep)
{
	struct user_key_payload *upayload;
	size_t datalen = prep->datalen;

	if (datalen <= 0 || datalen > 32767 || !prep->data)
		return -EINVAL;

	upayload = kmalloc(sizeof(*upayload) + datalen, GFP_KERNEL);
	if (!upayload)
		return -ENOMEM;

	/* attach the data */
	prep->quotalen = datalen;
	prep->payload.data[0] = upayload;
	upayload->datalen = datalen;
	memcpy(upayload->data, prep->data, datalen);
	return 0;
}

Project: linux
File: user_defined.c

long user_read(const struct key *key, char __user *buffer, size_t buflen)
{
	const struct user_key_payload *upayload;
	long ret;

	upayload = user_key_payload(key);
	ret = upayload->datalen;

	/* we can return the data as is */
	if (buffer && buflen > 0) {
		if (buflen > upayload->datalen)
			buflen = upayload->datalen;

		if (copy_to_user(buffer, upayload->data, buflen) != 0)
			ret = -EFAULT;
	}

	return ret;
}