linux-kernel - [PATCH v2 1/3] keys, trusted: select the hash algorithm

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Date:	Fri, 30 Oct 2015 13:35:07 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	chris.j.arges@...onical.com, seth.forshee@...onical.com,
	colin.king@...onical.com, josh@...htriplett.org,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	David Safford <safford@...ibm.com>,
	Jonathan Corbet <corbet@....net>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	linux-doc@...r.kernel.org (open list:DOCUMENTATION)
Subject: [PATCH v2 1/3] keys, trusted: select the hash algorithm

Added 'hash=' option for selecting the hash algorithm for add_key()
syscall and documentation for it.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 Documentation/security/keys-trusted-encrypted.txt |  3 +++
 include/keys/trusted-type.h                       |  1 +
 security/keys/Kconfig                             |  1 +
 security/keys/trusted.c                           | 20 +++++++++++++++++++-
 4 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/Documentation/security/keys-trusted-encrypted.txt b/Documentation/security/keys-trusted-encrypted.txt
index e105ae9..fd2565b 100644
--- a/Documentation/security/keys-trusted-encrypted.txt
+++ b/Documentation/security/keys-trusted-encrypted.txt
@@ -38,6 +38,9 @@ Usage:
        pcrlock=	  pcr number to be extended to "lock" blob
        migratable= 0|1 indicating permission to reseal to new PCR values,
                    default 1 (resealing allowed)
+       hash=      hash algorithm name as a string. For TPM 1.x the only
+                  allowed value is sha1. For TPM 2.x the allowed values
+		  are sha1, sha256, sha384, sha512 and sm3-256.
 
 "keyctl print" returns an ascii hex copy of the sealed key, which is in standard
 TPM_STORED_DATA format.  The key length for new keys are always in bytes.
diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
index f91ecd9..a6a1008 100644
--- a/include/keys/trusted-type.h
+++ b/include/keys/trusted-type.h
@@ -36,6 +36,7 @@ struct trusted_key_options {
 	uint32_t pcrinfo_len;
 	unsigned char pcrinfo[MAX_PCRINFO_SIZE];
 	int pcrlock;
+	uint32_t hash;
 };
 
 extern struct key_type key_type_trusted;
diff --git a/security/keys/Kconfig b/security/keys/Kconfig
index 72483b8..fe4d74e 100644
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -54,6 +54,7 @@ config TRUSTED_KEYS
 	select CRYPTO
 	select CRYPTO_HMAC
 	select CRYPTO_SHA1
+	select CRYPTO_HASH_INFO
 	help
 	  This option provides support for creating, sealing, and unsealing
 	  keys in the kernel. Trusted keys are random number symmetric keys,
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index d3633cf..7a87bcd 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -11,6 +11,7 @@
  * See Documentation/security/keys-trusted-encrypted.txt
  */
 
+#include <crypto/hash_info.h>
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -710,7 +711,8 @@ enum {
 	Opt_err = -1,
 	Opt_new, Opt_load, Opt_update,
 	Opt_keyhandle, Opt_keyauth, Opt_blobauth,
-	Opt_pcrinfo, Opt_pcrlock, Opt_migratable
+	Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
+	Opt_hash,
 };
 
 static const match_table_t key_tokens = {
@@ -723,6 +725,7 @@ static const match_table_t key_tokens = {
 	{Opt_pcrinfo, "pcrinfo=%s"},
 	{Opt_pcrlock, "pcrlock=%s"},
 	{Opt_migratable, "migratable=%s"},
+	{Opt_hash, "hash=%s"},
 	{Opt_err, NULL}
 };
 
@@ -736,6 +739,7 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 	int res;
 	unsigned long handle;
 	unsigned long lock;
+	int i;
 
 	while ((p = strsep(&c, " \t"))) {
 		if (*p == '\0' || *p == ' ' || *p == '\t')
@@ -787,6 +791,20 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
 				return -EINVAL;
 			opt->pcrlock = lock;
 			break;
+		case Opt_hash:
+			for (i = 0; i < HASH_ALGO__LAST; i++) {
+				if (!strcmp(args[0].from, hash_algo_name[i])) {
+					opt->hash = i;
+					break;
+				}
+			}
+			res = tpm_is_tpm2(TPM_ANY_NUM);
+			if (res < 0)
+				return res;
+			if (i == HASH_ALGO__LAST ||
+			    (!res && i != HASH_ALGO_SHA1))
+				return -EINVAL;
+			break;
 		default:
 			return -EINVAL;
 		}
-- 
2.5.0

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