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path: root/drivers/char/tpm/tpm2-cmd.c
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Diffstat (limited to 'drivers/char/tpm/tpm2-cmd.c')
-rw-r--r--drivers/char/tpm/tpm2-cmd.c60
1 files changed, 53 insertions, 7 deletions
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index c12130485..45a634016 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -16,6 +16,7 @@
*/
#include "tpm.h"
+#include <crypto/hash_info.h>
#include <keys/trusted-type.h>
enum tpm2_object_attributes {
@@ -104,6 +105,19 @@ struct tpm2_cmd {
union tpm2_cmd_params params;
} __packed;
+struct tpm2_hash {
+ unsigned int crypto_id;
+ unsigned int tpm_id;
+};
+
+static struct tpm2_hash tpm2_hash_map[] = {
+ {HASH_ALGO_SHA1, TPM2_ALG_SHA1},
+ {HASH_ALGO_SHA256, TPM2_ALG_SHA256},
+ {HASH_ALGO_SHA384, TPM2_ALG_SHA384},
+ {HASH_ALGO_SHA512, TPM2_ALG_SHA512},
+ {HASH_ALGO_SM3_256, TPM2_ALG_SM3_256},
+};
+
/*
* Array with one entry per ordinal defining the maximum amount
* of time the chip could take to return the result. The values
@@ -429,8 +443,20 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
{
unsigned int blob_len;
struct tpm_buf buf;
+ u32 hash;
+ int i;
int rc;
+ for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
+ if (options->hash == tpm2_hash_map[i].crypto_id) {
+ hash = tpm2_hash_map[i].tpm_id;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(tpm2_hash_map))
+ return -EINVAL;
+
rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
if (rc)
return rc;
@@ -452,12 +478,26 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
tpm_buf_append_u8(&buf, payload->migratable);
/* public */
- tpm_buf_append_u16(&buf, 14);
+ if (options->policydigest)
+ tpm_buf_append_u16(&buf, 14 + options->digest_len);
+ else
+ tpm_buf_append_u16(&buf, 14);
tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
- tpm_buf_append_u16(&buf, TPM2_ALG_SHA256);
- tpm_buf_append_u32(&buf, TPM2_ATTR_USER_WITH_AUTH);
- tpm_buf_append_u16(&buf, 0); /* policy digest size */
+ tpm_buf_append_u16(&buf, hash);
+
+ /* policy */
+ if (options->policydigest) {
+ tpm_buf_append_u32(&buf, 0);
+ tpm_buf_append_u16(&buf, options->digest_len);
+ tpm_buf_append(&buf, options->policydigest,
+ options->digest_len);
+ } else {
+ tpm_buf_append_u32(&buf, TPM2_ATTR_USER_WITH_AUTH);
+ tpm_buf_append_u16(&buf, 0);
+ }
+
+ /* public parameters */
tpm_buf_append_u16(&buf, TPM2_ALG_NULL);
tpm_buf_append_u16(&buf, 0);
@@ -488,8 +528,12 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
out:
tpm_buf_destroy(&buf);
- if (rc > 0)
- rc = -EPERM;
+ if (rc > 0) {
+ if ((rc & TPM2_RC_HASH) == TPM2_RC_HASH)
+ rc = -EINVAL;
+ else
+ rc = -EPERM;
+ }
return rc;
}
@@ -583,7 +627,9 @@ static int tpm2_unseal(struct tpm_chip *chip,
return rc;
tpm_buf_append_u32(&buf, blob_handle);
- tpm2_buf_append_auth(&buf, TPM2_RS_PW,
+ tpm2_buf_append_auth(&buf,
+ options->policyhandle ?
+ options->policyhandle : TPM2_RS_PW,
NULL /* nonce */, 0,
0 /* session_attributes */,
options->blobauth /* hmac */,