linux-kernel - [PATCH 18/18] keyctl_pkey: Add pkey parameter slen to pass in PSS salt length

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Date:   Tue, 30 Mar 2021 22:28:29 +0200
From:   Varad Gautam <varad.gautam@...e.com>
To:     linux-crypto@...r.kernel.org
CC:     Varad Gautam <varad.gautam@...e.com>,
        David Howells <dhowells@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        keyrings@...r.kernel.org (open list:ASYMMETRIC KEYS),
        linux-kernel@...r.kernel.org (open list),
        linux-security-module@...r.kernel.org (open list:SECURITY SUBSYSTEM)
Subject: [PATCH 18/18] keyctl_pkey: Add pkey parameter slen to pass in PSS salt length

keyctl pkey_* operations accept enc and hash parameters at present.
RSASSA-PSS signatures also require passing in the signature salt
length.

Add another parameter 'slen' to feed in salt length of a PSS
signature.

Signed-off-by: Varad Gautam <varad.gautam@...e.com>
---
 crypto/asymmetric_keys/asymmetric_type.c | 1 +
 include/linux/keyctl.h                   | 1 +
 security/keys/keyctl_pkey.c              | 6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index ad8af3d70ac0..eb2ef4a07f8e 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -571,6 +571,7 @@ static int asymmetric_key_verify_signature(struct kernel_pkey_params *params,
 		.hash_algo	= params->hash_algo,
 		.digest		= (void *)in,
 		.s		= (void *)in2,
+		.salt_length	= params->slen,
 	};
 
 	return verify_signature(params->key, &sig);
diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index 5b79847207ef..970c7bed3082 100644
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -37,6 +37,7 @@ struct kernel_pkey_params {
 		__u32	in2_len;	/* 2nd input data size (verify) */
 	};
 	enum kernel_pkey_operation op : 8;
+	__u32		slen;
 };
 
 #endif /* __LINUX_KEYCTL_H */
diff --git a/security/keys/keyctl_pkey.c b/security/keys/keyctl_pkey.c
index 5de0d599a274..b54a021e16b1 100644
--- a/security/keys/keyctl_pkey.c
+++ b/security/keys/keyctl_pkey.c
@@ -24,11 +24,13 @@ enum {
 	Opt_err,
 	Opt_enc,		/* "enc=<encoding>" eg. "enc=oaep" */
 	Opt_hash,		/* "hash=<digest-name>" eg. "hash=sha1" */
+	Opt_slen,		/* "slen=<salt-length>" eg. "slen=32" */
 };
 
 static const match_table_t param_keys = {
 	{ Opt_enc,	"enc=%s" },
 	{ Opt_hash,	"hash=%s" },
+	{ Opt_slen,	"slen=%u" },
 	{ Opt_err,	NULL }
 };
 
@@ -63,6 +65,10 @@ static int keyctl_pkey_params_parse(struct kernel_pkey_params *params)
 			params->hash_algo = q;
 			break;
 
+		case Opt_slen:
+			if (kstrtouint(q, 0, &params->slen))
+				return -EINVAL;
+			break;
 		default:
 			return -EINVAL;
 		}
-- 
2.30.2