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PKCS#7: Use x509_request_asymmetric_key()

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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@redhat.com>
Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
David Howells 2014-07-28 14:11:32 +01:00
parent 185de09c6a
commit 5ce43ad282
3 changed files with 29 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
crypto/asymmetric_keys/pkcs7_trust.c
View File

@ -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;

36
crypto/asymmetric_keys/x509_public_key.c
View File

@ -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)) {

4
include/crypto/public_key.h
View File

@ -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 */