blob: f83300b6e8c13033e5e239be8d48e7fb379668de [file] [log] [blame]
/* Instantiate a public key crypto key from an X.509 Certificate
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#define pr_fmt(fmt) "X.509: "fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/mpi.h>
#include <linux/asn1_decoder.h>
#include <keys/asymmetric-subtype.h>
#include <keys/asymmetric-parser.h>
#include <keys/system_keyring.h>
#include <crypto/hash.h>
#include "asymmetric_keys.h"
#include "public_key.h"
#include "x509_parser.h"
/*
* Find a key in the given keyring by issuer and authority.
*/
static struct key *x509_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;
/* 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);
}
/*
* Set up the signature parameters in an X.509 certificate. This involves
* digesting the signed data and extracting the signature.
*/
int x509_get_sig_params(struct x509_certificate *cert)
{
struct crypto_shash *tfm;
struct shash_desc *desc;
size_t digest_size, desc_size;
void *digest;
int ret;
pr_devel("==>%s()\n", __func__);
if (cert->sig.rsa.s)
return 0;
cert->sig.rsa.s = mpi_read_raw_data(cert->raw_sig, cert->raw_sig_size);
if (!cert->sig.rsa.s)
return -ENOMEM;
cert->sig.nr_mpi = 1;
/* Allocate the hashing algorithm we're going to need and find out how
* big the hash operational data will be.
*/
tfm = crypto_alloc_shash(hash_algo_name[cert->sig.pkey_hash_algo], 0, 0);
if (IS_ERR(tfm))
return (PTR_ERR(tfm) == -ENOENT) ? -ENOPKG : PTR_ERR(tfm);
desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
digest_size = crypto_shash_digestsize(tfm);
/* We allocate the hash operational data storage on the end of the
* digest storage space.
*/
ret = -ENOMEM;
digest = kzalloc(digest_size + desc_size, GFP_KERNEL);
if (!digest)
goto error;
cert->sig.digest = digest;
cert->sig.digest_size = digest_size;
desc = digest + digest_size;
desc->tfm = tfm;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
ret = crypto_shash_init(desc);
if (ret < 0)
goto error;
might_sleep();
ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, digest);
error:
crypto_free_shash(tfm);
pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
}
EXPORT_SYMBOL_GPL(x509_get_sig_params);
/*
* Check the signature on a certificate using the provided public key
*/
int x509_check_signature(const struct public_key *pub,
struct x509_certificate *cert)
{
int ret;
pr_devel("==>%s()\n", __func__);
ret = x509_get_sig_params(cert);
if (ret < 0)
return ret;
ret = public_key_verify_signature(pub, &cert->sig);
pr_debug("Cert Verification: %d\n", ret);
return ret;
}
EXPORT_SYMBOL_GPL(x509_check_signature);
/*
* Check the new certificate against the ones in the trust keyring. If one of
* those is the signing key and validates the new certificate, then mark the
* new certificate as being trusted.
*
* Return 0 if the new certificate was successfully validated, 1 if we couldn't
* find a matching parent certificate in the trusted list and an error if there
* is a matching certificate but the signature check fails.
*/
static int x509_validate_trust(struct x509_certificate *cert,
struct key *trust_keyring)
{
const struct public_key *pk;
struct key *key;
int ret = 1;
key = x509_request_asymmetric_key(trust_keyring,
cert->issuer, strlen(cert->issuer),
cert->authority,
strlen(cert->authority));
if (!IS_ERR(key)) {
pk = key->payload.data;
ret = x509_check_signature(pk, cert);
}
return ret;
}
/*
* Attempt to parse a data blob for a key as an X509 certificate.
*/
static int x509_key_preparse(struct key_preparsed_payload *prep)
{
struct x509_certificate *cert;
size_t srlen, sulen;
char *desc = NULL;
int ret;
cert = x509_cert_parse(prep->data, prep->datalen);
if (IS_ERR(cert))
return PTR_ERR(cert);
pr_devel("Cert Issuer: %s\n", cert->issuer);
pr_devel("Cert Subject: %s\n", cert->subject);
if (cert->pub->pkey_algo >= PKEY_ALGO__LAST ||
cert->sig.pkey_algo >= PKEY_ALGO__LAST ||
cert->sig.pkey_hash_algo >= PKEY_HASH__LAST ||
!pkey_algo[cert->pub->pkey_algo] ||
!pkey_algo[cert->sig.pkey_algo] ||
!hash_algo_name[cert->sig.pkey_hash_algo]) {
ret = -ENOPKG;
goto error_free_cert;
}
pr_devel("Cert Key Algo: %s\n", pkey_algo_name[cert->pub->pkey_algo]);
pr_devel("Cert Valid From: %04ld-%02d-%02d %02d:%02d:%02d\n",
cert->valid_from.tm_year + 1900, cert->valid_from.tm_mon + 1,
cert->valid_from.tm_mday, cert->valid_from.tm_hour,
cert->valid_from.tm_min, cert->valid_from.tm_sec);
pr_devel("Cert Valid To: %04ld-%02d-%02d %02d:%02d:%02d\n",
cert->valid_to.tm_year + 1900, cert->valid_to.tm_mon + 1,
cert->valid_to.tm_mday, cert->valid_to.tm_hour,
cert->valid_to.tm_min, cert->valid_to.tm_sec);
pr_devel("Cert Signature: %s + %s\n",
pkey_algo_name[cert->sig.pkey_algo],
hash_algo_name[cert->sig.pkey_hash_algo]);
if (!cert->fingerprint) {
pr_warn("Cert for '%s' must have a SubjKeyId extension\n",
cert->subject);
ret = -EKEYREJECTED;
goto error_free_cert;
}
cert->pub->algo = pkey_algo[cert->pub->pkey_algo];
cert->pub->id_type = PKEY_ID_X509;
/* Check the signature on the key if it appears to be self-signed */
if (!cert->authority ||
strcmp(cert->fingerprint, cert->authority) == 0) {
ret = x509_check_signature(cert->pub, cert); /* self-signed */
if (ret < 0)
goto error_free_cert;
} else {
ret = x509_validate_trust(cert, system_trusted_keyring);
if (!ret)
prep->trusted = 1;
}
/* Propose a description */
sulen = strlen(cert->subject);
srlen = strlen(cert->fingerprint);
ret = -ENOMEM;
desc = kmalloc(sulen + 2 + srlen + 1, GFP_KERNEL);
if (!desc)
goto error_free_cert;
memcpy(desc, cert->subject, sulen);
desc[sulen] = ':';
desc[sulen + 1] = ' ';
memcpy(desc + sulen + 2, cert->fingerprint, srlen);
desc[sulen + 2 + srlen] = 0;
/* We're pinning the module by being linked against it */
__module_get(public_key_subtype.owner);
prep->type_data[0] = &public_key_subtype;
prep->type_data[1] = cert->fingerprint;
prep->payload = cert->pub;
prep->description = desc;
prep->quotalen = 100;
/* We've finished with the certificate */
cert->pub = NULL;
cert->fingerprint = NULL;
desc = NULL;
ret = 0;
error_free_cert:
x509_free_certificate(cert);
return ret;
}
static struct asymmetric_key_parser x509_key_parser = {
.owner = THIS_MODULE,
.name = "x509",
.parse = x509_key_preparse,
};
/*
* Module stuff
*/
static int __init x509_key_init(void)
{
return register_asymmetric_key_parser(&x509_key_parser);
}
static void __exit x509_key_exit(void)
{
unregister_asymmetric_key_parser(&x509_key_parser);
}
module_init(x509_key_init);
module_exit(x509_key_exit);
MODULE_DESCRIPTION("X.509 certificate parser");
MODULE_LICENSE("GPL");