[PATCH v3 0/5] KEYS: asymmetric: tpm2_key_rsa

[PATCH v3 0/5] KEYS: asymmetric: tpm2_key_rsa

[Jarkko Sakkinen]

## Overview

Introduce tpm2_key_rsa module, which implements asymmetric TPM2 RSA key.
The feature can be enabled with the CONFIG_ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE 
kconfig option.

The idea in the design is to over time to have submodule per key type
For instance, tpm2_key_ecdsa could be one potential future addition in
the future. Perhaps, it might sense to consider at that point also a
top-level tpm2_key module. The gist is that the naming convention is
free from potential future bottlencks.

## Change Log

v3:
* Dropped special policy when RH_NULL is given. Kernel will just try to
  use the handle as parent given.
* Thus could drop the patch exporting tpm2_load_context().
v2:
* Cleaned up all the low-hanging fruit for the sake of saving everyones
  time. After this I move into reactive mode (I promise) ;-)

## Testing

tpm2_createprimary --hierarchy o -G rsa2048 -c owner.txt
tpm2_evictcontrol -c owner.txt 0x81000001
tpm2_getcap handles-persistent
openssl genrsa -out private.pem 2048
tpm2_import -C 0x81000001 -G rsa -i private.pem -u key.pub -r key.priv
tpm2_encodeobject -C 0x81000001 -u key.pub -r key.priv -o key.priv.pem
openssl asn1parse -inform pem -in key.priv.pem -noout -out key.priv.der
serial=`cat key.priv.der | keyctl padd asymmetric tpm @u`
echo "abcdefg" > plaintext.txt
keyctl pkey_encrypt $serial 0 plaintext.txt enc=pkcs1 > encrypted.dat
keyctl pkey_decrypt $serial 0 encrypted.dat enc=pkcs1 > decrypted.dat
keyctl pkey_sign $serial 0 plaintext.txt enc=pkcs1 hash=sha256 > signed.dat
keyctl pkey_verify $serial 0 plaintext.txt signed.dat enc=pkcs1 hash=sha256

## References

- v2: https://lore.kernel.org/linux-integrity/20240521031645.17008-1-jarkko@kernel.org/
- v1: https://lore.kernel.org/linux-integrity/20240520184727.22038-1-jarkko@kernel.org/
- Derived from https://lore.kernel.org/all/20200518172704.29608-1-prestwoj@gmail.com/

James Prestwood (1):
  keys: asymmetric: ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE

Jarkko Sakkinen (4):
  crypto: rsa-pkcs1pad: export rsa1_asn_lookup()
  lib: Expand asn1_encode_integer() to variable size integers
  KEYS: trusted: Move tpm2_key_decode() to the TPM driver
  tpm: tpm2_key: Extend parser to TPM_LoadableKey

 crypto/asymmetric_keys/Kconfig                |  16 +
 crypto/asymmetric_keys/Makefile               |   1 +
 crypto/asymmetric_keys/tpm2_key_rsa.c         | 688 ++++++++++++++++++
 crypto/rsa-pkcs1pad.c                         |  16 +-
 drivers/char/tpm/Kconfig                      |   1 +
 drivers/char/tpm/Makefile                     |   5 +
 drivers/char/tpm/tpm2_key.c                   | 118 +++
 .../char/tpm}/tpm2key.asn1                    |   0
 include/crypto/rsa-pkcs1pad.h                 |  20 +
 include/crypto/tpm2_key.h                     |  35 +
 include/linux/asn1_encoder.h                  |   3 +-
 include/linux/tpm.h                           |   2 +
 lib/asn1_encoder.c                            | 185 ++---
 security/keys/trusted-keys/Makefile           |   2 -
 security/keys/trusted-keys/trusted_tpm2.c     | 135 +---
 15 files changed, 1020 insertions(+), 207 deletions(-)
 create mode 100644 crypto/asymmetric_keys/tpm2_key_rsa.c
 create mode 100644 drivers/char/tpm/tpm2_key.c
 rename {security/keys/trusted-keys => drivers/char/tpm}/tpm2key.asn1 (100%)
 create mode 100644 include/crypto/rsa-pkcs1pad.h
 create mode 100644 include/crypto/tpm2_key.h

-- 
2.45.1

[PATCH v3 1/5] crypto: rsa-pkcs1pad: export rsa1_asn_lookup()

[Jarkko Sakkinen]

ASN.1 template is required for TPM2 asymmetric keys, as it needs to be
piggy-packed with the input data before applying TPM2_RSA_Decrypt. This
patch prepares crypto subsystem for the addition of those keys.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
 crypto/rsa-pkcs1pad.c         | 16 ++++++++++------
 include/crypto/rsa-pkcs1pad.h | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+), 6 deletions(-)
 create mode 100644 include/crypto/rsa-pkcs1pad.h

diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index cd501195f34a..00b6c14f861c 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -7,6 +7,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/akcipher.h>
+#include <crypto/rsa-pkcs1pad.h>
 #include <crypto/internal/akcipher.h>
 #include <crypto/internal/rsa.h>
 #include <linux/err.h>
@@ -79,11 +80,7 @@ static const u8 rsa_digest_info_sha3_512[] = {
 	0x05, 0x00, 0x04, 0x40
 };
 
-static const struct rsa_asn1_template {
-	const char	*name;
-	const u8	*data;
-	size_t		size;
-} rsa_asn1_templates[] = {
+static const struct rsa_asn1_template rsa_asn1_templates[] = {
 #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
 	_(md5),
 	_(sha1),
@@ -101,7 +98,13 @@ static const struct rsa_asn1_template {
 	{ NULL }
 };
 
-static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
+/**
+ * rsa_lookup_asn1() - Lookup the ASN.1 digest info given the hash
+ * name:	hash algorithm name
+ *
+ * Returns the ASN.1 digest info on success, and NULL on failure.
+ */
+const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
 {
 	const struct rsa_asn1_template *p;
 
@@ -110,6 +113,7 @@ static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
 			return p;
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(rsa_lookup_asn1);
 
 struct pkcs1pad_ctx {
 	struct crypto_akcipher *child;
diff --git a/include/crypto/rsa-pkcs1pad.h b/include/crypto/rsa-pkcs1pad.h
new file mode 100644
index 000000000000..32c7453ff644
--- /dev/null
+++ b/include/crypto/rsa-pkcs1pad.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RSA padding templates.
+ */
+
+#ifndef _CRYPTO_RSA_PKCS1PAD_H
+#define _CRYPTO_RSA_PKCS1PAD_H
+
+/*
+ * Hash algorithm name to ASN.1 template mapping.
+ */
+struct rsa_asn1_template {
+	const char *name;
+	const u8 *data;
+	size_t size;
+};
+
+const struct rsa_asn1_template *rsa_lookup_asn1(const char *name);
+
+#endif /* _CRYPTO_RSA_PKCS1PAD_H */
-- 
2.45.1

[PATCH v3 2/5] lib: Expand asn1_encode_integer() to variable size integers

[Jarkko Sakkinen]

Expand asn1_encode_integer() to variable size integers, meaning that it
will get a blob in big-endian format as integer and length of the blob as
parameters. This is required in order to encode RSA public key modulus.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
v3:
* Fix off-by-one in indices when returning zero:
  https://lore.kernel.org/linux-integrity/SN7PR18MB5314CFBD18B011F292809EBFE3EA2@SN7PR18MB5314.namprd18.prod.outlook.com/
---
 include/linux/asn1_encoder.h              |   3 +-
 lib/asn1_encoder.c                        | 185 ++++++++++++----------
 security/keys/trusted-keys/trusted_tpm2.c |   4 +-
 3 files changed, 103 insertions(+), 89 deletions(-)

diff --git a/include/linux/asn1_encoder.h b/include/linux/asn1_encoder.h
index 08cd0c2ad34f..ad5fb18db9e2 100644
--- a/include/linux/asn1_encoder.h
+++ b/include/linux/asn1_encoder.h
@@ -9,9 +9,10 @@
 #include <linux/bug.h>
 
 #define asn1_oid_len(oid) (sizeof(oid)/sizeof(u32))
+
 unsigned char *
 asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
-		    s64 integer);
+		    const u8 *integer, int integer_len);
 unsigned char *
 asn1_encode_oid(unsigned char *data, const unsigned char *end_data,
 		u32 oid[], int oid_len);
diff --git a/lib/asn1_encoder.c b/lib/asn1_encoder.c
index 0fd3c454a468..266e8042742e 100644
--- a/lib/asn1_encoder.c
+++ b/lib/asn1_encoder.c
@@ -9,12 +9,78 @@
 #include <linux/bug.h>
 #include <linux/string.h>
 #include <linux/module.h>
+#include <linux/slab.h>
+
+/**
+ * asn1_encode_length() - encode a length to follow an ASN.1 tag
+ * @data: pointer to encode at
+ * @data_len: pointer to remaining length (adjusted by routine)
+ * @len: length to encode
+ *
+ * This routine can encode lengths up to 65535 using the ASN.1 rules.
+ * It will accept a negative length and place a zero length tag
+ * instead (to keep the ASN.1 valid).  This convention allows other
+ * encoder primitives to accept negative lengths as singalling the
+ * sequence will be re-encoded when the length is known.
+ */
+static int asn1_encode_length(unsigned char **data, int *data_len, int len)
+{
+	if (*data_len < 1)
+		return -EINVAL;
+
+	if (len < 0) {
+		*((*data)++) = 0;
+		(*data_len)--;
+		return 0;
+	}
+
+	if (len <= 0x7f) {
+		*((*data)++) = len;
+		(*data_len)--;
+		return 0;
+	}
+
+	if (*data_len < 2)
+		return -EINVAL;
+
+	if (len <= 0xff) {
+		*((*data)++) = 0x81;
+		*((*data)++) = len & 0xff;
+		*data_len -= 2;
+		return 0;
+	}
+
+	if (*data_len < 3)
+		return -EINVAL;
+
+	if (len <= 0xffff) {
+		*((*data)++) = 0x82;
+		*((*data)++) = (len >> 8) & 0xff;
+		*((*data)++) = len & 0xff;
+		*data_len -= 3;
+		return 0;
+	}
+
+	if (WARN(len > 0xffffff, "ASN.1 length can't be > 0xffffff"))
+		return -EINVAL;
+
+	if (*data_len < 4)
+		return -EINVAL;
+	*((*data)++) = 0x83;
+	*((*data)++) = (len >> 16) & 0xff;
+	*((*data)++) = (len >> 8) & 0xff;
+	*((*data)++) = len & 0xff;
+	*data_len -= 4;
+
+	return 0;
+}
 
 /**
  * asn1_encode_integer() - encode positive integer to ASN.1
- * @data:	pointer to the pointer to the data
- * @end_data:	end of data pointer, points one beyond last usable byte in @data
- * @integer:	integer to be encoded
+ * @data:		pointer to the pointer to the data
+ * @end_data:		end of data pointer, points one beyond last usable byte in @data
+ * @integer:		integer to be encoded
+ * @integer_len:	length in bytes of the integer blob
  *
  * This is a simplified encoder: it only currently does
  * positive integers, but it should be simple enough to add the
@@ -22,15 +88,17 @@
  */
 unsigned char *
 asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
-		    s64 integer)
+		    const u8 *integer, int integer_len)
 {
 	int data_len = end_data - data;
-	unsigned char *d = &data[2];
 	bool found = false;
+	unsigned char *d;
+	int encoded_len;
+	u8 *encoded;
+	int ret;
 	int i;
 
-	if (WARN(integer < 0,
-		 "BUG: integer encode only supports positive integers"))
+	if (WARN(!integer, "BUG: integer is null"))
 		return ERR_PTR(-EINVAL);
 
 	if (IS_ERR(data))
@@ -40,17 +108,22 @@ asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
 	if (data_len < 3)
 		return ERR_PTR(-EINVAL);
 
-	/* remaining length where at d (the start of the integer encoding) */
-	data_len -= 2;
+	(*data++) = _tag(UNIV, PRIM, INT);
+	data_len--;
 
-	data[0] = _tag(UNIV, PRIM, INT);
-	if (integer == 0) {
-		*d++ = 0;
-		goto out;
+	if (!memchr_inv(integer, 0, integer_len)) {
+		data[0] = 1;
+		data[1] = 0;
+		return &data[2];
 	}
 
-	for (i = sizeof(integer); i > 0 ; i--) {
-		int byte = integer >> (8 * (i - 1));
+	encoded = kzalloc(integer_len, GFP_KERNEL);
+	if (!encoded)
+		return ERR_PTR(-ENOMEM);
+	d = encoded;
+
+	for (i = 0; i < integer_len; i++) {
+		int byte = integer[i];
 
 		if (!found && byte == 0)
 			continue;
@@ -67,21 +140,23 @@ asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
 			 * have len >= 1
 			 */
 			*d++ = 0;
-			data_len--;
 		}
 
 		found = true;
-		if (data_len == 0)
-			return ERR_PTR(-EINVAL);
-
 		*d++ = byte;
-		data_len--;
 	}
 
- out:
-	data[1] = d - data - 2;
+	encoded_len = d - encoded;
 
-	return d;
+	ret = asn1_encode_length(&data, &data_len, encoded_len);
+	if (ret)  {
+		kfree(encoded);
+		return ERR_PTR(ret);
+	}
+
+	memcpy(data, encoded, encoded_len);
+	kfree(encoded);
+	return data + encoded_len;
 }
 EXPORT_SYMBOL_GPL(asn1_encode_integer);
 
@@ -176,70 +251,6 @@ asn1_encode_oid(unsigned char *data, const unsigned char *end_data,
 }
 EXPORT_SYMBOL_GPL(asn1_encode_oid);
 
-/**
- * asn1_encode_length() - encode a length to follow an ASN.1 tag
- * @data: pointer to encode at
- * @data_len: pointer to remaining length (adjusted by routine)
- * @len: length to encode
- *
- * This routine can encode lengths up to 65535 using the ASN.1 rules.
- * It will accept a negative length and place a zero length tag
- * instead (to keep the ASN.1 valid).  This convention allows other
- * encoder primitives to accept negative lengths as singalling the
- * sequence will be re-encoded when the length is known.
- */
-static int asn1_encode_length(unsigned char **data, int *data_len, int len)
-{
-	if (*data_len < 1)
-		return -EINVAL;
-
-	if (len < 0) {
-		*((*data)++) = 0;
-		(*data_len)--;
-		return 0;
-	}
-
-	if (len <= 0x7f) {
-		*((*data)++) = len;
-		(*data_len)--;
-		return 0;
-	}
-
-	if (*data_len < 2)
-		return -EINVAL;
-
-	if (len <= 0xff) {
-		*((*data)++) = 0x81;
-		*((*data)++) = len & 0xff;
-		*data_len -= 2;
-		return 0;
-	}
-
-	if (*data_len < 3)
-		return -EINVAL;
-
-	if (len <= 0xffff) {
-		*((*data)++) = 0x82;
-		*((*data)++) = (len >> 8) & 0xff;
-		*((*data)++) = len & 0xff;
-		*data_len -= 3;
-		return 0;
-	}
-
-	if (WARN(len > 0xffffff, "ASN.1 length can't be > 0xffffff"))
-		return -EINVAL;
-
-	if (*data_len < 4)
-		return -EINVAL;
-	*((*data)++) = 0x83;
-	*((*data)++) = (len >> 16) & 0xff;
-	*((*data)++) = (len >> 8) & 0xff;
-	*((*data)++) = len & 0xff;
-	*data_len -= 4;
-
-	return 0;
-}
-
 /**
  * asn1_encode_tag() - add a tag for optional or explicit value
  * @data:	pointer to place tag at
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 8b7dd73d94c1..ec59f9389a2d 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -38,6 +38,7 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
 	u8 *end_work = scratch + SCRATCH_SIZE;
 	u8 *priv, *pub;
 	u16 priv_len, pub_len;
+	u32 key_handle;
 	int ret;
 
 	priv_len = get_unaligned_be16(src) + 2;
@@ -77,7 +78,8 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
 		goto err;
 	}
 
-	work = asn1_encode_integer(work, end_work, options->keyhandle);
+	key_handle = cpu_to_be32(options->keyhandle);
+	work = asn1_encode_integer(work, end_work, (u8 *)&key_handle, 4);
 	work = asn1_encode_octet_string(work, end_work, pub, pub_len);
 	work = asn1_encode_octet_string(work, end_work, priv, priv_len);
 
-- 
2.45.1

[PATCH v3 3/5] KEYS: trusted: Move tpm2_key_decode() to the TPM driver

[Jarkko Sakkinen]

Move tpm2_key_decode() to the TPM driver and export the symbols to make
them callable from trusted keys. It can re-used for asymmetric keys.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
v2:
Do not allocate blob twice. Use the one inside struct tpm2_key.
---
 drivers/char/tpm/Kconfig                      |   1 +
 drivers/char/tpm/Makefile                     |   5 +
 drivers/char/tpm/tpm2_key.c                   | 111 +++++++++++++++
 .../char/tpm}/tpm2key.asn1                    |   0
 include/crypto/tpm2_key.h                     |  33 +++++
 security/keys/trusted-keys/Makefile           |   2 -
 security/keys/trusted-keys/trusted_tpm2.c     | 127 +++---------------
 7 files changed, 167 insertions(+), 112 deletions(-)
 create mode 100644 drivers/char/tpm/tpm2_key.c
 rename {security/keys/trusted-keys => drivers/char/tpm}/tpm2key.asn1 (100%)
 create mode 100644 include/crypto/tpm2_key.h

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index e63a6a17793c..de2f4093c939 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -7,6 +7,7 @@ menuconfig TCG_TPM
 	tristate "TPM Hardware Support"
 	depends on HAS_IOMEM
 	imply SECURITYFS
+	select ASN1
 	select CRYPTO
 	select CRYPTO_HASH_INFO
 	help
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 4c695b0388f3..071437058ef6 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -17,6 +17,11 @@ tpm-y += eventlog/tpm1.o
 tpm-y += eventlog/tpm2.o
 tpm-y += tpm-buf.o
 
+# TPM2 Asymmetric Key
+$(obj)/trusted_tpm2.o: $(obj)/tpm2key.asn1.h
+tpm-y += tpm2key.asn1.o
+tpm-y += tpm2_key.o
+
 tpm-$(CONFIG_TCG_TPM2_HMAC) += tpm2-sessions.o
 tpm-$(CONFIG_ACPI) += tpm_ppi.o eventlog/acpi.o
 tpm-$(CONFIG_EFI) += eventlog/efi.o
diff --git a/drivers/char/tpm/tpm2_key.c b/drivers/char/tpm/tpm2_key.c
new file mode 100644
index 000000000000..0112362e432e
--- /dev/null
+++ b/drivers/char/tpm/tpm2_key.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/oid_registry.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <crypto/tpm2_key.h>
+#include <asm/unaligned.h>
+#include "tpm2key.asn1.h"
+
+#undef pr_fmt
+#define pr_fmt(fmt) "tpm2_key: "fmt
+
+int tpm2_key_parent(void *context, size_t hdrlen,
+		    unsigned char tag,
+		    const void *value, size_t vlen)
+{
+	struct tpm2_key *ctx = context;
+	const u8 *v = value;
+	int i;
+
+	ctx->parent = 0;
+	for (i = 0; i < vlen; i++) {
+		ctx->parent <<= 8;
+		ctx->parent |= v[i];
+	}
+
+	return 0;
+}
+
+int tpm2_key_type(void *context, size_t hdrlen,
+		  unsigned char tag,
+		  const void *value, size_t vlen)
+{
+	enum OID oid = look_up_OID(value, vlen);
+
+	if (oid != OID_TPMSealedData) {
+		char buffer[50];
+
+		sprint_oid(value, vlen, buffer, sizeof(buffer));
+		pr_debug("OID is \"%s\" which is not TPMSealedData\n",
+			 buffer);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int tpm2_key_pub(void *context, size_t hdrlen,
+		 unsigned char tag,
+		 const void *value, size_t vlen)
+{
+	struct tpm2_key *ctx = context;
+
+	ctx->pub = value;
+	ctx->pub_len = vlen;
+
+	return 0;
+}
+
+int tpm2_key_priv(void *context, size_t hdrlen,
+		  unsigned char tag,
+		  const void *value, size_t vlen)
+{
+	struct tpm2_key *ctx = context;
+
+	ctx->priv = value;
+	ctx->priv_len = vlen;
+
+	return 0;
+}
+
+/**
+ * tpm_key_decode() - Decode TPM2 ASN.1 key.
+ * @src:		ASN.1 source.
+ * @src_len:		ASN.1 source length.
+ * @key:		TPM2 asymmetric key.
+ * @max_key_len:	Maximum length of the TPM2 asymmetric key.
+ *
+ * Decodes TPM2 ASN.1 key on success. Returns POSIX error code on failure.
+ */
+int tpm2_key_decode(const u8 *src, u32 src_len, struct tpm2_key *key,
+		    u32 max_key_len)
+{
+	struct tpm2_key ctx;
+	u32 blob_len;
+	int ret;
+
+	memset(&ctx, 0, sizeof(ctx));
+
+	ret = asn1_ber_decoder(&tpm2key_decoder, &ctx, src, src_len);
+	if (ret < 0)
+		return ret;
+
+	blob_len = ctx.priv_len + ctx.pub_len;
+	if (blob_len > max_key_len)
+		return -E2BIG;
+
+	ctx.blob_len = blob_len;
+	ctx.blob = kmalloc(blob_len, GFP_KERNEL);
+	if (!ctx.blob)
+		return -ENOMEM;
+
+	memcpy((void *)ctx.blob, ctx.priv, ctx.priv_len);
+	memcpy((void *)ctx.blob + ctx.priv_len, ctx.pub, ctx.pub_len);
+	ctx.priv = ctx.blob;
+	ctx.pub = ctx.blob + ctx.priv_len;
+
+	memcpy(key, &ctx, sizeof(ctx));
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tpm2_key_decode);
diff --git a/security/keys/trusted-keys/tpm2key.asn1 b/drivers/char/tpm/tpm2key.asn1
similarity index 100%
rename from security/keys/trusted-keys/tpm2key.asn1
rename to drivers/char/tpm/tpm2key.asn1
diff --git a/include/crypto/tpm2_key.h b/include/crypto/tpm2_key.h
new file mode 100644
index 000000000000..acf41b2e0c92
--- /dev/null
+++ b/include/crypto/tpm2_key.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __LINUX_TPM2_KEY_H__
+#define __LINUX_TPM2_KEY_H__
+
+#include <linux/slab.h>
+
+/*
+ * TPM2 ASN.1 key
+ */
+struct tpm2_key {
+	u32 parent;
+	const u8 *blob;
+	u32 blob_len;
+	const u8 *pub;
+	u32 pub_len;
+	const u8 *priv;
+	u32 priv_len;
+};
+
+int tpm2_key_decode(const u8 *src, u32 src_len, struct tpm2_key *key,
+		    u32 max_key_len);
+
+/**
+ * tpm2_key_free() - Release TPM2 asymmetric key resources and reset values
+ * @key:	TPM2 asymmetric key.
+ */
+static inline void tpm2_key_destroy(struct tpm2_key *key)
+{
+	kfree(key->blob);
+	memset(key, 0, sizeof(*key));
+}
+
+#endif /* __LINUX_TPM2_KEY_H__ */
diff --git a/security/keys/trusted-keys/Makefile b/security/keys/trusted-keys/Makefile
index f0f3b27f688b..2674d5c10fc9 100644
--- a/security/keys/trusted-keys/Makefile
+++ b/security/keys/trusted-keys/Makefile
@@ -7,9 +7,7 @@ obj-$(CONFIG_TRUSTED_KEYS) += trusted.o
 trusted-y += trusted_core.o
 trusted-$(CONFIG_TRUSTED_KEYS_TPM) += trusted_tpm1.o
 
-$(obj)/trusted_tpm2.o: $(obj)/tpm2key.asn1.h
 trusted-$(CONFIG_TRUSTED_KEYS_TPM) += trusted_tpm2.o
-trusted-$(CONFIG_TRUSTED_KEYS_TPM) += tpm2key.asn1.o
 
 trusted-$(CONFIG_TRUSTED_KEYS_TEE) += trusted_tee.o
 
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index ec59f9389a2d..f255388d32b8 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -13,11 +13,10 @@
 
 #include <keys/trusted-type.h>
 #include <keys/trusted_tpm.h>
+#include <crypto/tpm2_key.h>
 
 #include <asm/unaligned.h>
 
-#include "tpm2key.asn1.h"
-
 static struct tpm2_hash tpm2_hash_map[] = {
 	{HASH_ALGO_SHA1, TPM_ALG_SHA1},
 	{HASH_ALGO_SHA256, TPM_ALG_SHA256},
@@ -28,9 +27,9 @@ static struct tpm2_hash tpm2_hash_map[] = {
 
 static u32 tpm2key_oid[] = { 2, 23, 133, 10, 1, 5 };
 
-static int tpm2_key_encode(struct trusted_key_payload *payload,
-			   struct trusted_key_options *options,
-			   u8 *src, u32 len)
+static int tpm2_trusted_key_encode(struct trusted_key_payload *payload,
+				   struct trusted_key_options *options,
+				   u8 *src, u32 len)
 {
 	const int SCRATCH_SIZE = PAGE_SIZE;
 	u8 *scratch = kmalloc(SCRATCH_SIZE, GFP_KERNEL);
@@ -100,106 +99,6 @@ static int tpm2_key_encode(struct trusted_key_payload *payload,
 	return ret;
 }
 
-struct tpm2_key_context {
-	u32 parent;
-	const u8 *pub;
-	u32 pub_len;
-	const u8 *priv;
-	u32 priv_len;
-};
-
-static int tpm2_key_decode(struct trusted_key_payload *payload,
-			   struct trusted_key_options *options,
-			   u8 **buf)
-{
-	int ret;
-	struct tpm2_key_context ctx;
-	u8 *blob;
-
-	memset(&ctx, 0, sizeof(ctx));
-
-	ret = asn1_ber_decoder(&tpm2key_decoder, &ctx, payload->blob,
-			       payload->blob_len);
-	if (ret < 0)
-		return ret;
-
-	if (ctx.priv_len + ctx.pub_len > MAX_BLOB_SIZE)
-		return -EINVAL;
-
-	blob = kmalloc(ctx.priv_len + ctx.pub_len + 4, GFP_KERNEL);
-	if (!blob)
-		return -ENOMEM;
-
-	*buf = blob;
-	options->keyhandle = ctx.parent;
-
-	memcpy(blob, ctx.priv, ctx.priv_len);
-	blob += ctx.priv_len;
-
-	memcpy(blob, ctx.pub, ctx.pub_len);
-
-	return 0;
-}
-
-int tpm2_key_parent(void *context, size_t hdrlen,
-		  unsigned char tag,
-		  const void *value, size_t vlen)
-{
-	struct tpm2_key_context *ctx = context;
-	const u8 *v = value;
-	int i;
-
-	ctx->parent = 0;
-	for (i = 0; i < vlen; i++) {
-		ctx->parent <<= 8;
-		ctx->parent |= v[i];
-	}
-
-	return 0;
-}
-
-int tpm2_key_type(void *context, size_t hdrlen,
-		unsigned char tag,
-		const void *value, size_t vlen)
-{
-	enum OID oid = look_up_OID(value, vlen);
-
-	if (oid != OID_TPMSealedData) {
-		char buffer[50];
-
-		sprint_oid(value, vlen, buffer, sizeof(buffer));
-		pr_debug("OID is \"%s\" which is not TPMSealedData\n",
-			 buffer);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-int tpm2_key_pub(void *context, size_t hdrlen,
-	       unsigned char tag,
-	       const void *value, size_t vlen)
-{
-	struct tpm2_key_context *ctx = context;
-
-	ctx->pub = value;
-	ctx->pub_len = vlen;
-
-	return 0;
-}
-
-int tpm2_key_priv(void *context, size_t hdrlen,
-		unsigned char tag,
-		const void *value, size_t vlen)
-{
-	struct tpm2_key_context *ctx = context;
-
-	ctx->priv = value;
-	ctx->priv_len = vlen;
-
-	return 0;
-}
-
 /**
  * tpm2_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
  *
@@ -349,7 +248,8 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
 		goto out;
 	}
 
-	blob_len = tpm2_key_encode(payload, options, &buf.data[offset], blob_len);
+	blob_len = tpm2_trusted_key_encode(payload, options, &buf.data[offset],
+					   blob_len);
 
 out:
 	tpm_buf_destroy(&sized);
@@ -389,21 +289,27 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 			 struct trusted_key_options *options,
 			 u32 *blob_handle)
 {
-	struct tpm_buf buf;
 	unsigned int private_len;
 	unsigned int public_len;
 	unsigned int blob_len;
-	u8 *blob, *pub;
+	struct tpm2_key key;
+	struct tpm_buf buf;
+	const u8 *blob, *pub;
 	int rc;
 	u32 attrs;
 
-	rc = tpm2_key_decode(payload, options, &blob);
+	rc = tpm2_key_decode(payload->blob, payload->blob_len, &key, PAGE_SIZE);
 	if (rc) {
 		/* old form */
 		blob = payload->blob;
 		payload->old_format = 1;
+	} else {
+		blob = key.blob;
 	}
 
+	if (!blob)
+		return -ENOMEM;
+
 	/* new format carries keyhandle but old format doesn't */
 	if (!options->keyhandle)
 		return -EINVAL;
@@ -467,7 +373,8 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 
 out:
 	if (blob != payload->blob)
-		kfree(blob);
+		tpm2_key_destroy(&key);
+
 	tpm_buf_destroy(&buf);
 
 	if (rc > 0)
-- 
2.45.1

[PATCH v3 4/5] tpm: tpm2_key: Extend parser to TPM_LoadableKey

[Jarkko Sakkinen]

Extend parser to TPM_LoadableKey. Add field for oid to struct tpm2_key
so that callers can differentiate different key types.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
v3:
* Fixup klog messages:
  https://lore.kernel.org/linux-integrity/SN7PR18MB53140F4341BC441C1C11586EE3EA2@SN7PR18MB5314.namprd18.prod.outlook.com/
---
 drivers/char/tpm/tpm2_key.c               | 17 ++++++++++++-----
 include/crypto/tpm2_key.h                 |  2 ++
 security/keys/trusted-keys/trusted_tpm2.c |  4 ++++
 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/char/tpm/tpm2_key.c b/drivers/char/tpm/tpm2_key.c
index 0112362e432e..06be1cc0156b 100644
--- a/drivers/char/tpm/tpm2_key.c
+++ b/drivers/char/tpm/tpm2_key.c
@@ -32,16 +32,23 @@ int tpm2_key_type(void *context, size_t hdrlen,
 		  const void *value, size_t vlen)
 {
 	enum OID oid = look_up_OID(value, vlen);
-
-	if (oid != OID_TPMSealedData) {
+	struct tpm2_key *key = context;
+
+	switch (oid) {
+	case OID_TPMSealedData:
+		pr_debug("TPMSealedData\n");
+		break;
+	case OID_TPMLoadableKey:
+		pr_debug("TPMLodableKey\n");
+		break;
+	default:
 		char buffer[50];
-
 		sprint_oid(value, vlen, buffer, sizeof(buffer));
-		pr_debug("OID is \"%s\" which is not TPMSealedData\n",
-			 buffer);
+		pr_debug("Unknown OID \"%s\"\n", buffer);
 		return -EINVAL;
 	}
 
+	key->oid = oid;
 	return 0;
 }
 
diff --git a/include/crypto/tpm2_key.h b/include/crypto/tpm2_key.h
index acf41b2e0c92..2d2434233000 100644
--- a/include/crypto/tpm2_key.h
+++ b/include/crypto/tpm2_key.h
@@ -2,12 +2,14 @@
 #ifndef __LINUX_TPM2_KEY_H__
 #define __LINUX_TPM2_KEY_H__
 
+#include <linux/oid_registry.h>
 #include <linux/slab.h>
 
 /*
  * TPM2 ASN.1 key
  */
 struct tpm2_key {
+	enum OID oid;
 	u32 parent;
 	const u8 *blob;
 	u32 blob_len;
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index f255388d32b8..ce4c667c3ee3 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -305,6 +305,10 @@ static int tpm2_load_cmd(struct tpm_chip *chip,
 		payload->old_format = 1;
 	} else {
 		blob = key.blob;
+		if (key.oid != OID_TPMSealedData) {
+			tpm2_key_destroy(&key);
+			return -EINVAL;
+		}
 	}
 
 	if (!blob)
-- 
2.45.1

[PATCH v3 5/5] keys: asymmetric: ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE

[Jarkko Sakkinen]

From: James Prestwood <prestwoj@gmail.com>

Based on earlier work by James Prestwood.

Add ASN.1 compatible asymmetric TPM2 RSA key subtype:

1. Signing and decryption (with the private key) is handled by
   TPM2_RSA_Decrypt.
2. Encryption (with the public key) is handled by the kernel RSA
   implementation.

Link: https://lore.kernel.org/all/20200518172704.29608-1-prestwoj@gmail.com/
Signed-off-by: James Prestwood <prestwoj@gmail.com>
Co-developed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
v3:
* Drop the special case for null handle i.e. do not define policy.
* Remove empty line:
  https://lore.kernel.org/linux-integrity/SN7PR18MB531494159D3996799475209DE3EA2@SN7PR18MB5314.namprd18.prod.outlook.com/
v2:
* Remove two spurios pr_info() messsages that I forgot to remove.
* Clean up padding functions and add additional checks for length
  also in tpm2_unpad_pcks1().
* Add the missing success check kzalloc() in tpm2_key_rsa_decrypt().
* Check that params->out_len for capacity before copying the result.
---
 crypto/asymmetric_keys/Kconfig        |  16 +
 crypto/asymmetric_keys/Makefile       |   1 +
 crypto/asymmetric_keys/tpm2_key_rsa.c | 688 ++++++++++++++++++++++++++
 include/linux/tpm.h                   |   2 +
 4 files changed, 707 insertions(+)
 create mode 100644 crypto/asymmetric_keys/tpm2_key_rsa.c

diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index e1345b8f39f1..4d14bb0c346e 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -15,6 +15,7 @@ config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	select MPILIB
 	select CRYPTO_HASH_INFO
 	select CRYPTO_AKCIPHER
+	select CRYPTO_RSA
 	select CRYPTO_SIG
 	select CRYPTO_HASH
 	help
@@ -23,6 +24,21 @@ config ASYMMETRIC_PUBLIC_KEY_SUBTYPE
 	  appropriate hash algorithms (such as SHA-1) must be available.
 	  ENOPKG will be reported if the requisite algorithm is unavailable.
 
+config ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE
+	tristate "Asymmetric TPM2 RSA crypto algorithm subtype"
+	depends on TCG_TPM
+	select TCG_TPM2_HMAC
+	select CRYPTO_RSA
+	select CRYPTO_SHA256
+	select CRYPTO_HASH_INFO
+	select ASN1
+	select ASN1_ENCODER
+	help
+	  This option provides support for asymmetric TPM2 key type handling.
+	  If signature generation and/or verification are to be used,
+	  appropriate hash algorithms (such as SHA-256) must be available.
+	  ENOPKG will be reported if the requisite algorithm is unavailable.
+
 config X509_CERTIFICATE_PARSER
 	tristate "X.509 certificate parser"
 	depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE
diff --git a/crypto/asymmetric_keys/Makefile b/crypto/asymmetric_keys/Makefile
index bc65d3b98dcb..c6da84607824 100644
--- a/crypto/asymmetric_keys/Makefile
+++ b/crypto/asymmetric_keys/Makefile
@@ -11,6 +11,7 @@ asymmetric_keys-y := \
 	signature.o
 
 obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o
+obj-$(CONFIG_ASYMMETRIC_TPM2_KEY_RSA_SUBTYPE) += tpm2_key_rsa.o
 
 #
 # X.509 Certificate handling
diff --git a/crypto/asymmetric_keys/tpm2_key_rsa.c b/crypto/asymmetric_keys/tpm2_key_rsa.c
new file mode 100644
index 000000000000..ecdfa169f406
--- /dev/null
+++ b/crypto/asymmetric_keys/tpm2_key_rsa.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* TPM2 asymmetric public-key crypto subtype
+ *
+ * See Documentation/crypto/asymmetric-keys.rst
+ *
+ * Copyright (c) 2020 Intel Corporation
+ */
+
+#include <asm/unaligned.h>
+#include <crypto/akcipher.h>
+#include <crypto/public_key.h>
+#include <crypto/rsa-pkcs1pad.h>
+#include <crypto/tpm2_key.h>
+#include <keys/asymmetric-parser.h>
+#include <keys/asymmetric-subtype.h>
+#include <keys/trusted-type.h>
+#include <linux/asn1_encoder.h>
+#include <linux/keyctl.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/tpm.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "tpm2_key_rsa: "fmt
+
+#define PUB_KEY_BUF_SIZE 512
+
+struct tpm2_key_rsa {
+	struct tpm2_key key;
+	const u8 *pub;
+	int pub_len;
+};
+
+static const int PKCS1_PAD_MIN_SIZE = 11;
+
+/*
+ * Fill the data with PKCS#1 v1.5 padding.
+ */
+static int tpm2_pad_pkcs1(const u8 *in, int in_len, u8 *out, int out_len)
+{
+	unsigned int prefix_len = out_len - in_len - 3;
+
+	if (in_len > out_len - PKCS1_PAD_MIN_SIZE)
+		return -EBADMSG;
+
+	/* prefix */
+	out[0] = 0;
+	out[1] = 1;
+	memset(&out[2], 0xff, prefix_len);
+	out[2 + prefix_len] = 0;
+	/* payload */
+	memcpy(&out[2 + prefix_len + 1], in, in_len);
+
+	return 0;
+}
+
+/*
+ * RFC 3447 - Section 7.2.2
+ * Size of the input data should be checked against public key size by
+ * the caller.
+ */
+static const u8 *tpm2_unpad_pkcs1(const u8 *in, int in_len, int *out_len)
+{
+	int i;
+
+	if (in[0] != 0 || in[1] != 2)
+		return NULL;
+
+	i = 2;
+	while (in[i] != 0 && i < in_len)
+		i++;
+
+	if (i == in_len || i < (PKCS1_PAD_MIN_SIZE - 1))
+		return NULL;
+
+	*out_len = in_len - i - 1;
+	return in + i + 1;
+}
+
+/*
+ * Outputs the cipher algorithm name on success, and retuns -ENOPKG
+ * on failure.
+ */
+static int tpm2_key_get_akcipher(const char *encoding, const char *hash_algo,
+				 char *cipher)
+{
+	ssize_t ret;
+
+	if (strcmp(encoding, "pkcs1") == 0) {
+		if (!hash_algo) {
+			strcpy(cipher, "pkcs1pad(rsa)");
+			return 0;
+		}
+
+		ret = snprintf(cipher, CRYPTO_MAX_ALG_NAME,
+			       "pkcs1pad(rsa,%s)",
+			       hash_algo);
+		if (ret >= CRYPTO_MAX_ALG_NAME)
+			return -ENOPKG;
+
+		return 0;
+	}
+
+	if (strcmp(encoding, "raw") == 0) {
+		strcpy(cipher, "rsa");
+		return 0;
+	}
+
+	return -ENOPKG;
+}
+
+static int tpm2_key_rsa_extract_pub(struct tpm2_key_rsa *key_rsa)
+{
+	struct tpm2_key *key = &key_rsa->key;
+	struct tpm_buf buf;
+	off_t offset = 2;
+	u16 policy_len;
+	u32 attr;
+	u16 bits;
+	u16 type;
+	u16 len;
+	u16 alg;
+	u32 exp;
+
+	buf.flags = TPM_BUF_TPM2B;
+	buf.length = key->pub_len;
+	buf.data = (void *)key->pub;
+
+	if (get_unaligned_be16(key->pub) != buf.length - 2)
+		return -EINVAL;
+
+	type = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub type: 0x%04x\n", type);
+	if (type != TPM_ALG_RSA)
+		return -EINVAL;
+
+	alg = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub name alg: 0x%04x\n", alg);
+	attr = tpm_buf_read_u32(&buf, &offset);
+	pr_debug("pub attributes: 0x%08x\n", attr);
+	policy_len = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub policy length: %u bytes\n", policy_len);
+	offset += policy_len;
+
+	alg = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub symmetric: 0x%04x\n", alg);
+	if (alg != TPM_ALG_NULL)
+		return -EINVAL;
+
+	alg = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub symmetric scheme: 0x%04x\n", alg);
+	if (alg != TPM_ALG_NULL)
+		return -EINVAL;
+
+	bits = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub bits: %u\n", bits);
+
+	exp = tpm_buf_read_u32(&buf, &offset);
+	pr_debug("pub exponent: 0x%08x\n", exp);
+	if (exp != 0x00000000 && exp !=  0x00010001)
+		return -EINVAL;
+
+	len = tpm_buf_read_u16(&buf, &offset);
+	pr_debug("pub modulus: %u bytes\n", len);
+	key_rsa->pub = key->pub + offset;
+	key_rsa->pub_len = len;
+
+	return buf.flags & TPM_BUF_BOUNDARY_ERROR ? -EIO : 0;
+}
+
+static int tpm2_key_rsa_encode(const struct tpm2_key_rsa *key, u8 *buf)
+{
+	const int SCRATCH_SIZE = PAGE_SIZE;
+	const u8 exp[3] = {1, 0, 1};
+	u8 *scratch, *work, *work1, *end_work;
+	int pub_len = key->pub_len;
+	const u8 *pub = key->pub;
+	int ret;
+
+	scratch = kmalloc(SCRATCH_SIZE, GFP_KERNEL);
+	if (!scratch)
+		return -ENOMEM;
+
+	work = scratch;
+	end_work = &scratch[SCRATCH_SIZE];
+
+	work = asn1_encode_integer(work, end_work, pub, pub_len);
+	if (IS_ERR(work)) {
+		ret = PTR_ERR(work);
+		goto err;
+	}
+
+	work = asn1_encode_integer(work, end_work, exp, 3);
+	if (IS_ERR(work)) {
+		ret = PTR_ERR(work);
+		goto err;
+	}
+
+	work1 = buf;
+	work1 = asn1_encode_sequence(work1, &work1[PUB_KEY_BUF_SIZE],
+				     scratch, work - scratch);
+	if (IS_ERR(work1)) {
+		ret = PTR_ERR(work1);
+		goto err;
+	}
+
+	memset(work1, 0, 8);
+
+	kfree(scratch);
+	return work1 - buf;
+
+err:
+	kfree(scratch);
+	return ret;
+}
+
+/*
+ * Encryption operation is performed with the public key.  Hence it is done
+ * in software
+ */
+static int tpm2_key_rsa_encrypt(struct tpm2_key_rsa *key,
+				struct kernel_pkey_params *params,
+				const void *in, void *out)
+{
+	char cipher[CRYPTO_MAX_ALG_NAME];
+	struct scatterlist in_sg, out_sg;
+	u8 enc_pub_key[PUB_KEY_BUF_SIZE];
+	struct akcipher_request *req;
+	struct crypto_akcipher *tfm;
+	struct crypto_wait cwait;
+	int rc;
+
+	rc = tpm2_key_get_akcipher(params->encoding, params->hash_algo, cipher);
+	if (rc < 0)
+		return rc;
+
+	tfm = crypto_alloc_akcipher(cipher, 0, 0);
+	if (IS_ERR(tfm))
+		return PTR_ERR(tfm);
+
+	rc = tpm2_key_rsa_encode(key, enc_pub_key);
+	if (rc < 0)
+		goto err_tfm;
+
+	rc = crypto_akcipher_set_pub_key(tfm, enc_pub_key, rc);
+	if (rc < 0)
+		goto err_tfm;
+
+	req = akcipher_request_alloc(tfm, GFP_KERNEL);
+	if (!req) {
+		rc = -ENOMEM;
+		goto err_tfm;
+	}
+
+	sg_init_one(&in_sg, in, params->in_len);
+	sg_init_one(&out_sg, out, params->out_len);
+	akcipher_request_set_crypt(req, &in_sg, &out_sg, params->in_len,
+				   params->out_len);
+
+	crypto_init_wait(&cwait);
+	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+				      CRYPTO_TFM_REQ_MAY_SLEEP,
+				      crypto_req_done, &cwait);
+
+	rc = crypto_akcipher_encrypt(req);
+	rc = crypto_wait_req(rc, &cwait);
+	if (!rc)
+		rc = req->dst_len;
+
+	akcipher_request_free(req);
+
+err_tfm:
+	crypto_free_akcipher(tfm);
+
+	return rc;
+}
+
+static int __tpm2_key_rsa_decrypt(struct tpm_chip *chip,
+				  struct tpm2_key_rsa *key,
+				  struct kernel_pkey_params *params,
+				  const void *in, int in_len, void *out)
+{
+	unsigned int offset = 0;
+	u32 key_handle = 0;
+	struct tpm_buf buf;
+	u16 decrypted_len;
+	u32 parent;
+	u8 *pos;
+	int ret;
+
+	ret = tpm_try_get_ops(chip);
+	if (ret)
+		return ret;
+
+	ret = tpm2_start_auth_session(chip);
+	if (ret)
+		goto err_ops;
+
+	parent = key->key.parent;
+
+	ret = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
+	if (ret < 0)
+		goto err_parent;
+
+	tpm_buf_append_name(chip, &buf, parent, NULL);
+	tpm_buf_append_hmac_session(chip, &buf, TPM2_SA_CONTINUE_SESSION |
+				    TPM2_SA_ENCRYPT, NULL, 0);
+	tpm_buf_append(&buf, key->key.blob, key->key.blob_len);
+	if (buf.flags & TPM_BUF_OVERFLOW) {
+		ret = -E2BIG;
+		goto err_buf;
+	}
+	tpm_buf_fill_hmac_session(chip, &buf);
+	ret = tpm_transmit_cmd(chip, &buf, 4, "RSA key loading");
+	ret = tpm_buf_check_hmac_response(chip, &buf, ret);
+	if (ret) {
+		ret = -EIO;
+		goto err_buf;
+	}
+	key_handle = be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE]);
+
+	tpm_buf_reset(&buf, TPM2_ST_SESSIONS, TPM2_CC_RSA_DECRYPT);
+	tpm_buf_append_name(chip, &buf, key_handle, NULL);
+	tpm_buf_append_hmac_session(chip, &buf, TPM2_SA_DECRYPT, NULL, 0);
+	tpm_buf_append_u16(&buf, in_len);
+	tpm_buf_append(&buf, in, in_len);
+	tpm_buf_append_u16(&buf, TPM_ALG_NULL);
+	tpm_buf_append_u16(&buf, 0);
+	tpm_buf_fill_hmac_session(chip, &buf);
+	ret = tpm_transmit_cmd(chip, &buf, 4, "RSA key decrypting");
+	ret = tpm_buf_check_hmac_response(chip, &buf, ret);
+	if (ret) {
+		ret = -EIO;
+		goto err_blob;
+	}
+
+	pos = buf.data + TPM_HEADER_SIZE + 4;
+	decrypted_len = be16_to_cpup((__be16 *)pos);
+	pos += 2;
+
+	if (params->out_len < decrypted_len) {
+		ret = -EMSGSIZE;
+		goto err_blob;
+	}
+
+	memcpy(out, pos, decrypted_len);
+	ret = decrypted_len;
+
+err_blob:
+	tpm2_flush_context(chip, key_handle);
+
+err_buf:
+	tpm_buf_destroy(&buf);
+
+err_parent:
+	if (key->key.parent == TPM2_RH_NULL)
+		tpm2_flush_context(chip, parent);
+
+err_auth:
+	if (ret < 0)
+		tpm2_end_auth_session(chip);
+
+err_ops:
+	tpm_put_ops(chip);
+	return ret;
+}
+
+static int tpm2_key_rsa_decrypt(struct tpm_chip *chip, struct tpm2_key_rsa *key,
+				struct kernel_pkey_params *params,
+				const void *in, void *out)
+{
+	const u8 *ptr;
+	int out_len;
+	u8 *work;
+	int ret;
+
+	work = kzalloc(params->out_len, GFP_KERNEL);
+	if (!work)
+		return -ENOMEM;
+
+	ret = __tpm2_key_rsa_decrypt(chip, key, params, in, params->in_len,
+				     work);
+	if (ret < 0)
+		goto err;
+
+	ptr = tpm2_unpad_pkcs1(work, ret, &out_len);
+	if (!ptr) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (out_len > params->out_len) {
+		ret = -EMSGSIZE;
+		goto err;
+	}
+
+	memcpy(out, ptr, out_len);
+	kfree(work);
+	return out_len;
+
+err:
+	kfree(work);
+	return ret;
+}
+
+/*
+ * Sign operation is an encryption using the TPM's private key. With RSA the
+ * only difference between encryption and decryption is where the padding goes.
+ * Since own padding can be used, TPM2_RSA_Decrypt can be repurposed to do
+ * encryption.
+ */
+static int tpm2_key_rsa_sign(struct tpm_chip *chip, struct tpm2_key_rsa *key,
+			     struct kernel_pkey_params *params,
+			     const void *in, void *out)
+{
+	const struct rsa_asn1_template *asn1;
+	u32 in_len = params->in_len;
+	void *asn1_wrapped = NULL;
+	int pub_len = key->pub_len;
+	u8 *padded;
+	int ret;
+
+	if (strcmp(params->encoding, "pkcs1") != 0) {
+		ret = -ENOPKG;
+		goto err;
+	}
+
+	if (params->hash_algo) {
+		asn1 = rsa_lookup_asn1(params->hash_algo);
+		if (!asn1) {
+			ret = -ENOPKG;
+			goto err;
+		}
+
+		/* Request enough space for the ASN.1 template + input hash */
+		asn1_wrapped = kzalloc(in_len + asn1->size, GFP_KERNEL);
+		if (!asn1_wrapped) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		/* Copy ASN.1 template, then the input */
+		memcpy(asn1_wrapped, asn1->data, asn1->size);
+		memcpy(asn1_wrapped + asn1->size, in, in_len);
+
+		in = asn1_wrapped;
+		in_len += asn1->size;
+	}
+
+	/* with padding: */
+	padded = kmalloc(pub_len, GFP_KERNEL);
+	tpm2_pad_pkcs1(in, in_len, padded, pub_len);
+	ret = __tpm2_key_rsa_decrypt(chip, key, params, padded, pub_len, out);
+	kfree(padded);
+
+err:
+	kfree(asn1_wrapped);
+	return ret;
+}
+
+static void tpm2_key_rsa_describe(const struct key *asymmetric_key,
+				  struct seq_file *m)
+{
+	struct tpm2_key_rsa *key = asymmetric_key->payload.data[asym_crypto];
+
+	if (!key) {
+		pr_err("key blob missing");
+		return;
+	}
+
+	seq_puts(m, "TPM2/RSA");
+}
+
+static void tpm2_key_rsa_destroy(void *payload0, void *payload3)
+{
+	struct tpm2_key *key = payload0;
+
+	if (!key)
+		return;
+
+	tpm2_key_destroy(key);
+	kfree(key);
+}
+
+static int tpm2_key_rsa_eds_op(struct kernel_pkey_params *params,
+			       const void *in, void *out)
+{
+	struct tpm2_key_rsa *key = params->key->payload.data[asym_crypto];
+	struct tpm_chip *chip = tpm_default_chip();
+
+	if (!chip)
+		return -ENODEV;
+
+	switch (params->op) {
+	case kernel_pkey_encrypt:
+		return tpm2_key_rsa_encrypt(key, params, in, out);
+	case kernel_pkey_decrypt:
+		return tpm2_key_rsa_decrypt(chip, key, params, in, out);
+	case kernel_pkey_sign:
+		return tpm2_key_rsa_sign(chip, key, params, in, out);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int tpm2_key_rsa_verify(const struct key *key,
+			       const struct public_key_signature *sig)
+{
+	const struct tpm2_key_rsa *tpm2_key = key->payload.data[asym_crypto];
+	char alg_name[CRYPTO_MAX_ALG_NAME];
+	u8 enc_pub_key[PUB_KEY_BUF_SIZE];
+	struct akcipher_request *req;
+	struct scatterlist src_sg[2];
+	struct crypto_akcipher *tfm;
+	struct crypto_wait cwait;
+	int rc;
+
+	if (!sig->digest)
+		return -ENOPKG;
+
+	rc = tpm2_key_get_akcipher(sig->encoding, sig->hash_algo, alg_name);
+	if (rc < 0)
+		return rc;
+
+	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+	if (IS_ERR(tfm))
+		return PTR_ERR(tfm);
+
+	rc = tpm2_key_rsa_encode(tpm2_key, enc_pub_key);
+	if (rc < 0)
+		goto err_tfm;
+
+	rc = crypto_akcipher_set_pub_key(tfm, enc_pub_key, rc);
+	if (rc < 0)
+		goto err_tfm;
+
+	rc = -ENOMEM;
+	req = akcipher_request_alloc(tfm, GFP_KERNEL);
+	if (!req)
+		goto err_tfm;
+
+	sg_init_table(src_sg, 2);
+	sg_set_buf(&src_sg[0], sig->s, sig->s_size);
+	sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
+	akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size,
+				   sig->digest_size);
+	crypto_init_wait(&cwait);
+	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
+				      CRYPTO_TFM_REQ_MAY_SLEEP,
+				      crypto_req_done, &cwait);
+	rc = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
+
+	akcipher_request_free(req);
+
+err_tfm:
+	crypto_free_akcipher(tfm);
+	return rc;
+}
+
+static int tpm2_key_rsa_query(const struct kernel_pkey_params *params,
+			      struct kernel_pkey_query *info)
+{
+	struct tpm2_key_rsa *tk = params->key->payload.data[asym_crypto];
+	char alg_name[CRYPTO_MAX_ALG_NAME];
+	u8 enc_pub_key[PUB_KEY_BUF_SIZE];
+	struct crypto_akcipher *tfm;
+	unsigned int len;
+	int ret;
+
+	ret = tpm2_key_get_akcipher(params->encoding, params->hash_algo, alg_name);
+	if (ret < 0)
+		return ret;
+
+	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
+	if (IS_ERR(tfm))
+		return PTR_ERR(tfm);
+
+	ret = tpm2_key_rsa_encode(tk, enc_pub_key);
+	if (ret < 0)
+		goto err_tfm;
+
+	ret = crypto_akcipher_set_pub_key(tfm, enc_pub_key, ret);
+	if (ret < 0)
+		goto err_tfm;
+
+	len = crypto_akcipher_maxsize(tfm);
+
+	info->key_size = tk->pub_len * 8;
+	info->max_data_size = tk->pub_len;
+	info->max_sig_size = len;
+	info->max_enc_size = len;
+	info->max_dec_size = tk->pub_len;
+
+	info->supported_ops = KEYCTL_SUPPORTS_ENCRYPT |
+			      KEYCTL_SUPPORTS_DECRYPT |
+			      KEYCTL_SUPPORTS_VERIFY |
+			      KEYCTL_SUPPORTS_SIGN;
+
+err_tfm:
+	crypto_free_akcipher(tfm);
+	return ret;
+}
+
+/*
+ * Asymmetric TPM2 RSA key. Signs and decrypts with TPM.
+ */
+struct asymmetric_key_subtype tpm2_key_rsa_subtype = {
+	.owner			= THIS_MODULE,
+	.name			= "tpm2_key_rsa",
+	.name_len		= sizeof("tpm2_key_rsa") - 1,
+	.describe		= tpm2_key_rsa_describe,
+	.destroy		= tpm2_key_rsa_destroy,
+	.query			= tpm2_key_rsa_query,
+	.eds_op			= tpm2_key_rsa_eds_op,
+	.verify_signature	= tpm2_key_rsa_verify,
+};
+EXPORT_SYMBOL_GPL(tpm2_key_rsa_subtype);
+
+/*
+ * Attempt to parse a data blob for a key as a TPM private key blob.
+ */
+static int tpm2_key_preparse(struct key_preparsed_payload *prep)
+{
+	struct tpm2_key_rsa *key;
+	int ret;
+
+	key = kzalloc(sizeof(*key), GFP_KERNEL);
+	if (!key)
+		return -ENOMEM;
+
+	/*
+	 * TPM 2.0 RSA keys are recommended to be 2048 bits long. Assume the
+	 * blob is no more than 4x that.
+	 */
+	if (prep->datalen > 256 * 4) {
+		kfree(key);
+		return -EMSGSIZE;
+	}
+
+	ret = tpm2_key_decode(prep->data, prep->datalen, &key->key, PAGE_SIZE);
+	if (ret) {
+		kfree(key);
+		return ret;
+	}
+
+	if (key->key.oid != OID_TPMLoadableKey) {
+		tpm2_key_destroy(&key->key);
+		kfree(key);
+		return -EINVAL;
+	}
+
+	ret = tpm2_key_rsa_extract_pub(key);
+	if (ret < 0) {
+		tpm2_key_destroy(&key->key);
+		kfree(key);
+		return ret;
+	}
+
+	prep->payload.data[asym_subtype] = &tpm2_key_rsa_subtype;
+	prep->payload.data[asym_key_ids] = NULL;
+	prep->payload.data[asym_crypto] = key;
+	prep->payload.data[asym_auth] = NULL;
+	prep->quotalen = 100;
+	return 0;
+}
+
+static struct asymmetric_key_parser tpm2_key_rsa_parser = {
+	.owner	= THIS_MODULE,
+	.name	= "tpm2_key_rsa_parser",
+	.parse	= tpm2_key_preparse,
+};
+
+static int __init tpm2_key_rsa_init(void)
+{
+	return register_asymmetric_key_parser(&tpm2_key_rsa_parser);
+}
+
+static void __exit tpm2_key_rsa_exit(void)
+{
+	unregister_asymmetric_key_parser(&tpm2_key_rsa_parser);
+}
+
+module_init(tpm2_key_rsa_init);
+module_exit(tpm2_key_rsa_exit);
+
+MODULE_DESCRIPTION("Asymmetric TPM2 RSA key");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index c17e4efbb2e5..040be2c75868 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -43,6 +43,7 @@ enum tpm2_session_types {
 /* if you add a new hash to this, increment TPM_MAX_HASHES below */
 enum tpm_algorithms {
 	TPM_ALG_ERROR		= 0x0000,
+	TPM_ALG_RSA		= 0x0001,
 	TPM_ALG_SHA1		= 0x0004,
 	TPM_ALG_AES		= 0x0006,
 	TPM_ALG_KEYEDHASH	= 0x0008,
@@ -271,6 +272,7 @@ enum tpm2_command_codes {
 	TPM2_CC_NV_READ                 = 0x014E,
 	TPM2_CC_CREATE		        = 0x0153,
 	TPM2_CC_LOAD		        = 0x0157,
+	TPM2_CC_RSA_DECRYPT	        = 0x0159,
 	TPM2_CC_SEQUENCE_UPDATE         = 0x015C,
 	TPM2_CC_UNSEAL		        = 0x015E,
 	TPM2_CC_CONTEXT_LOAD	        = 0x0161,
-- 
2.45.1