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Date: Mon, 28 Jul 2014 14:54:59 +0100
From: David Howells <dhowells@...hat.com>
To: d.kasatkin@...sung.com, zohar@...ux.vnet.ibm.com
Cc: dhowells@...hat.com, keyrings@...ux-nfs.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] PKCS#7: Use x509_request_asymmetric_key()
pkcs7_request_asymmetric_key() and x509_request_asymmetric_key() do the same
thing, the latter being a copy of the former created by the IMA folks, so drop
the PKCS#7 version as the X.509 location is more general.
Whilst we're at it, rename the arguments of x509_request_asymmetric_key() to
better reflect what the values being passed in are intended to match on an
X.509 cert.
Signed-off-by: David Howells <dhowells@...hat.com>
---
crypto/asymmetric_keys/pkcs7_trust.c | 61 ++----------------------------
crypto/asymmetric_keys/x509_public_key.c | 36 ++++++++++--------
include/crypto/public_key.h | 4 ++
3 files changed, 29 insertions(+), 72 deletions(-)
diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c
index b6b045131403..e666eb011a85 100644
--- a/crypto/asymmetric_keys/pkcs7_trust.c
+++ b/crypto/asymmetric_keys/pkcs7_trust.c
@@ -20,55 +20,6 @@
#include "public_key.h"
#include "pkcs7_parser.h"
-/*
- * Request an asymmetric key.
- */
-static struct key *pkcs7_request_asymmetric_key(
- struct key *keyring,
- const char *signer, size_t signer_len,
- const char *authority, size_t auth_len)
-{
- key_ref_t key;
- char *id;
-
- kenter(",%zu,,%zu", signer_len, auth_len);
-
- /* Construct an identifier. */
- id = kmalloc(signer_len + 2 + auth_len + 1, GFP_KERNEL);
- if (!id)
- return ERR_PTR(-ENOMEM);
-
- memcpy(id, signer, signer_len);
- id[signer_len + 0] = ':';
- id[signer_len + 1] = ' ';
- memcpy(id + signer_len + 2, authority, auth_len);
- id[signer_len + 2 + auth_len] = 0;
-
- pr_debug("Look up: \"%s\"\n", id);
-
- key = keyring_search(make_key_ref(keyring, 1),
- &key_type_asymmetric, id);
- if (IS_ERR(key))
- pr_debug("Request for module key '%s' err %ld\n",
- id, PTR_ERR(key));
- kfree(id);
-
- if (IS_ERR(key)) {
- switch (PTR_ERR(key)) {
- /* Hide some search errors */
- case -EACCES:
- case -ENOTDIR:
- case -EAGAIN:
- return ERR_PTR(-ENOKEY);
- default:
- return ERR_CAST(key);
- }
- }
-
- pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key_ref_to_ptr(key)));
- return key_ref_to_ptr(key);
-}
-
/**
* Check the trust on one PKCS#7 SignedInfo block.
*/
@@ -98,10 +49,8 @@ int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
/* Look to see if this certificate is present in the trusted
* keys.
*/
- key = pkcs7_request_asymmetric_key(
- trust_keyring,
- x509->subject, strlen(x509->subject),
- x509->fingerprint, strlen(x509->fingerprint));
+ key = x509_request_asymmetric_key(trust_keyring, x509->subject,
+ x509->fingerprint);
if (!IS_ERR(key))
/* One of the X.509 certificates in the PKCS#7 message
* is apparently the same as one we already trust.
@@ -133,10 +82,8 @@ int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7,
return -ENOKEY;
}
- key = pkcs7_request_asymmetric_key(
- trust_keyring,
- last->issuer, strlen(last->issuer),
- last->authority, strlen(last->authority));
+ key = x509_request_asymmetric_key(trust_keyring, last->issuer,
+ last->authority);
if (IS_ERR(key))
return PTR_ERR(key) == -ENOMEM ? -ENOMEM : -ENOKEY;
x509 = last;
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 4ae982234d78..da1e5fc85346 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -43,35 +43,41 @@ static int __init ca_keys_setup(char *str)
__setup("ca_keys=", ca_keys_setup);
#endif
-/*
- * Find a key in the given keyring by issuer and authority.
+/**
+ * x509_request_asymmetric_key - Request a key by X.509 certificate params.
+ * @keyring: The keys to search.
+ * @subject: The name of the subject to whom the key belongs.
+ * @key_id: The subject key ID as a hex string.
+ *
+ * Find a key in the given keyring by subject name and key ID. These might,
+ * for instance, be the issuer name and the authority key ID of an X.509
+ * certificate that needs to be verified.
*/
-static struct key *x509_request_asymmetric_key(struct key *keyring,
- const char *signer,
- const char *authority)
+struct key *x509_request_asymmetric_key(struct key *keyring,
+ const char *subject,
+ const char *key_id)
{
key_ref_t key;
- size_t signer_len = strlen(signer), auth_len = strlen(authority);
+ size_t subject_len = strlen(subject), key_id_len = strlen(key_id);
char *id;
- /* Construct an identifier. */
- id = kmalloc(signer_len + 2 + auth_len + 1, GFP_KERNEL);
+ /* Construct an identifier "<subjname>:<keyid>". */
+ id = kmalloc(subject_len + 2 + key_id_len + 1, GFP_KERNEL);
if (!id)
return ERR_PTR(-ENOMEM);
- memcpy(id, signer, signer_len);
- id[signer_len + 0] = ':';
- id[signer_len + 1] = ' ';
- memcpy(id + signer_len + 2, authority, auth_len);
- id[signer_len + 2 + auth_len] = 0;
+ memcpy(id, subject, subject_len);
+ id[subject_len + 0] = ':';
+ id[subject_len + 1] = ' ';
+ memcpy(id + subject_len + 2, key_id, key_id_len);
+ id[subject_len + 2 + key_id_len] = 0;
pr_debug("Look up: \"%s\"\n", id);
key = keyring_search(make_key_ref(keyring, 1),
&key_type_asymmetric, id);
if (IS_ERR(key))
- pr_debug("Request for module key '%s' err %ld\n",
- id, PTR_ERR(key));
+ pr_debug("Request for key '%s' err %ld\n", id, PTR_ERR(key));
kfree(id);
if (IS_ERR(key)) {
diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index fc09732613ad..0d164c6af539 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -98,4 +98,8 @@ struct key;
extern int verify_signature(const struct key *key,
const struct public_key_signature *sig);
+extern struct key *x509_request_asymmetric_key(struct key *keyring,
+ const char *issuer,
+ const char *key_id);
+
#endif /* _LINUX_PUBLIC_KEY_H */
--
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