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Date: Tue, 29 Jul 2014 08:03:32 -0400
From: Mimi Zohar <zohar@...ux.vnet.ibm.com>
To: David Howells <dhowells@...hat.com>
Cc: d.kasatkin@...sung.com, keyrings@...ux-nfs.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PKCS#7: Use x509_request_asymmetric_key()
On Mon, 2014-07-28 at 14:54 +0100, David Howells wrote:
> 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>
Acked-by: Mimi Zohar <zohar@...ux.vnet.ibm.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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