[linux-2.6-block.git] / crypto / asymmetric_keys / x509_public_key.c

/* 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"

static bool use_builtin_keys;
static struct asymmetric_key_id *ca_keyid;

#ifndef MODULE
static struct {
	struct asymmetric_key_id id;
	unsigned char data[10];
} cakey;

static int __init ca_keys_setup(char *str)
{
	if (!str)		/* default system keyring */
		return 1;

	if (strncmp(str, "id:", 3) == 0) {
		struct asymmetric_key_id *p = &cakey.id;
		size_t hexlen = (strlen(str) - 3) / 2;
		int ret;

		if (hexlen == 0 || hexlen > sizeof(cakey.data)) {
			pr_err("Missing or invalid ca_keys id\n");
			return 1;
		}

		ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
		if (ret < 0)
			pr_err("Unparsable ca_keys id hex string\n");
		else
			ca_keyid = p;	/* owner key 'id:xxxxxx' */
	} else if (strcmp(str, "builtin") == 0) {
		use_builtin_keys = true;
	}

	return 1;
}
__setup("ca_keys=", ca_keys_setup);
#endif

/**
 * x509_request_asymmetric_key - Request a key by X.509 certificate params.
 * @keyring: The keys to search.
 * @kid: The key ID.
 * @partial: Use partial match if true, exact if false.
 *
 * 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.
 */
struct key *x509_request_asymmetric_key(struct key *keyring,
					const struct asymmetric_key_id *kid,
					bool partial)
{
	key_ref_t key;
	char *id, *p;

	/* Construct an identifier "id:<keyid>". */
	p = id = kmalloc(2 + 1 + kid->len * 2 + 1, GFP_KERNEL);
	if (!id)
		return ERR_PTR(-ENOMEM);

	if (partial) {
		*p++ = 'i';
		*p++ = 'd';
	} else {
		*p++ = 'e';
		*p++ = 'x';
	}
	*p++ = ':';
	p = bin2hex(p, kid->data, kid->len);
	*p = 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 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);
}
EXPORT_SYMBOL_GPL(x509_request_asymmetric_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->unsupported_crypto)
		return -ENOPKG;
	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)) {
		if (PTR_ERR(tfm) == -ENOENT) {
			cert->unsupported_crypto = true;
			return -ENOPKG;
		}
		return 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);
	if (ret == -ENOPKG)
		cert->unsupported_crypto = true;
	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)
{
	struct key *key;
	int ret = 1;

	if (!trust_keyring)
		return -EOPNOTSUPP;

	if (ca_keyid && !asymmetric_key_id_partial(cert->authority, ca_keyid))
		return -EPERM;

	key = x509_request_asymmetric_key(trust_keyring, cert->authority,
					  false);
	if (!IS_ERR(key))  {
		if (!use_builtin_keys
		    || test_bit(KEY_FLAG_BUILTIN, &key->flags))
			ret = x509_check_signature(key->payload.data, cert);
		key_put(key);
	}
	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 asymmetric_key_ids *kids;
	struct x509_certificate *cert;
	const char *q;
	size_t srlen, sulen;
	char *desc = NULL, *p;
	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]);

	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 ||
	    asymmetric_key_id_same(cert->skid, cert->authority)) {
		ret = x509_check_signature(cert->pub, cert); /* self-signed */
		if (ret < 0)
			goto error_free_cert;
	} else if (!prep->trusted) {
		ret = x509_validate_trust(cert, get_system_trusted_keyring());
		if (!ret)
			prep->trusted = 1;
	}

	/* Propose a description */
	sulen = strlen(cert->subject);
	if (cert->raw_skid) {
		srlen = cert->raw_skid_size;
		q = cert->raw_skid;
	} else {
		srlen = cert->raw_serial_size;
		q = cert->raw_serial;
	}
	if (srlen > 1 && *q == 0) {
		srlen--;
		q++;
	}

	ret = -ENOMEM;
	desc = kmalloc(sulen + 2 + srlen * 2 + 1, GFP_KERNEL);
	if (!desc)
		goto error_free_cert;
	p = memcpy(desc, cert->subject, sulen);
	p += sulen;
	*p++ = ':';
	*p++ = ' ';
	p = bin2hex(p, q, srlen);
	*p = 0;

	kids = kmalloc(sizeof(struct asymmetric_key_ids), GFP_KERNEL);
	if (!kids)
		goto error_free_desc;
	kids->id[0] = cert->id;
	kids->id[1] = cert->skid;

	/* 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] = kids;
	prep->payload[0] = cert->pub;
	prep->description = desc;
	prep->quotalen = 100;

	/* We've finished with the certificate */
	cert->pub = NULL;
	cert->id = NULL;
	cert->skid = NULL;
	desc = NULL;
	ret = 0;

error_free_desc:
	kfree(desc);
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");
Commit	Line	Data
c26fd69f DH	1	/* Instantiate a public key crypto key from an X.509 Certificate
	2	*
	3	* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#define pr_fmt(fmt) "X.509: "fmt
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/err.h>
	17	#include <linux/mpi.h>
	18	#include <linux/asn1_decoder.h>
	19	#include <keys/asymmetric-subtype.h>
	20	#include <keys/asymmetric-parser.h>
3be4beaf	21	#include <keys/system_keyring.h>
c26fd69f DH	22	#include <crypto/hash.h>
	23	#include "asymmetric_keys.h"
	24	#include "public_key.h"
	25	#include "x509_parser.h"
	26
32c4741c	27	static bool use_builtin_keys;
46963b77	28	static struct asymmetric_key_id *ca_keyid;
ffb70f61 DK	29
ffb70f61 DK	30	#ifndef MODULE
f2b3dee4 MZ	31	static struct {
	32	struct asymmetric_key_id id;
	33	unsigned char data[10];
	34	} cakey;
	35
ffb70f61 DK	36	static int __init ca_keys_setup(char *str)
	37	{
	38	if (!str) /* default system keyring */
	39	return 1;
	40
46963b77	41	if (strncmp(str, "id:", 3) == 0) {
f2b3dee4 MZ	42	struct asymmetric_key_id *p = &cakey.id;
	43	size_t hexlen = (strlen(str) - 3) / 2;
	44	int ret;
	45
	46	if (hexlen == 0 \|\| hexlen > sizeof(cakey.data)) {
	47	pr_err("Missing or invalid ca_keys id\n");
	48	return 1;
	49	}
	50
	51	ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
	52	if (ret < 0)
	53	pr_err("Unparsable ca_keys id hex string\n");
	54	else
46963b77 DH	55	ca_keyid = p; /* owner key 'id:xxxxxx' */
46963b77 DH	56	} else if (strcmp(str, "builtin") == 0) {
32c4741c	57	use_builtin_keys = true;
46963b77	58	}
ffb70f61 DK	59
	60	return 1;
	61	}
	62	__setup("ca_keys=", ca_keys_setup);
	63	#endif
	64
5ce43ad2 DH	65	/**
	66	* x509_request_asymmetric_key - Request a key by X.509 certificate params.
	67	* @keyring: The keys to search.
46963b77	68	* @kid: The key ID.
f1b731db	69	* @partial: Use partial match if true, exact if false.
5ce43ad2 DH	70	*
	71	* Find a key in the given keyring by subject name and key ID. These might,
	72	* for instance, be the issuer name and the authority key ID of an X.509
	73	* certificate that needs to be verified.
3be4beaf	74	*/
5ce43ad2	75	struct key x509_request_asymmetric_key(struct key keyring,
f1b731db DK	76	const struct asymmetric_key_id *kid,
f1b731db DK	77	bool partial)
3be4beaf MZ	78	{
3be4beaf MZ	79	key_ref_t key;
46963b77	80	char id, p;
3be4beaf	81
46963b77 DH	82	/* Construct an identifier "id:<keyid>". */
46963b77 DH	83	p = id = kmalloc(2 + 1 + kid->len * 2 + 1, GFP_KERNEL);
3be4beaf MZ	84	if (!id)
	85	return ERR_PTR(-ENOMEM);
	86
f1b731db DK	87	if (partial) {
	88	*p++ = 'i';
	89	*p++ = 'd';
	90	} else {
	91	*p++ = 'e';
	92	*p++ = 'x';
	93	}
46963b77 DH	94	*p++ = ':';
	95	p = bin2hex(p, kid->data, kid->len);
	96	*p = 0;
3be4beaf MZ	97
	98	pr_debug("Look up: \"%s\"\n", id);
	99
	100	key = keyring_search(make_key_ref(keyring, 1),
	101	&key_type_asymmetric, id);
	102	if (IS_ERR(key))
5ce43ad2	103	pr_debug("Request for key '%s' err %ld\n", id, PTR_ERR(key));
3be4beaf MZ	104	kfree(id);
	105
	106	if (IS_ERR(key)) {
	107	switch (PTR_ERR(key)) {
	108	/* Hide some search errors */
	109	case -EACCES:
	110	case -ENOTDIR:
	111	case -EAGAIN:
	112	return ERR_PTR(-ENOKEY);
	113	default:
	114	return ERR_CAST(key);
	115	}
	116	}
	117
	118	pr_devel("<==%s() = 0 [%x]\n", __func__,
	119	key_serial(key_ref_to_ptr(key)));
	120	return key_ref_to_ptr(key);
	121	}
cf5b50fd	122	EXPORT_SYMBOL_GPL(x509_request_asymmetric_key);
3be4beaf	123
c26fd69f	124	/*
b426beb6 DH	125	* Set up the signature parameters in an X.509 certificate. This involves
b426beb6 DH	126	* digesting the signed data and extracting the signature.
c26fd69f	127	*/
b426beb6	128	int x509_get_sig_params(struct x509_certificate *cert)
c26fd69f	129	{
c26fd69f DH	130	struct crypto_shash *tfm;
	131	struct shash_desc *desc;
	132	size_t digest_size, desc_size;
b426beb6	133	void *digest;
c26fd69f DH	134	int ret;
	135
	136	pr_devel("==>%s()\n", __func__);
b426beb6	137
41559420 DH	138	if (cert->unsupported_crypto)
41559420 DH	139	return -ENOPKG;
b426beb6 DH	140	if (cert->sig.rsa.s)
	141	return 0;
	142
	143	cert->sig.rsa.s = mpi_read_raw_data(cert->raw_sig, cert->raw_sig_size);
	144	if (!cert->sig.rsa.s)
	145	return -ENOMEM;
	146	cert->sig.nr_mpi = 1;
	147
c26fd69f DH	148	/* Allocate the hashing algorithm we're going to need and find out how
	149	* big the hash operational data will be.
	150	*/
3fe78ca2	151	tfm = crypto_alloc_shash(hash_algo_name[cert->sig.pkey_hash_algo], 0, 0);
41559420 DH	152	if (IS_ERR(tfm)) {
	153	if (PTR_ERR(tfm) == -ENOENT) {
	154	cert->unsupported_crypto = true;
	155	return -ENOPKG;
	156	}
	157	return PTR_ERR(tfm);
	158	}
c26fd69f DH	159
	160	desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
	161	digest_size = crypto_shash_digestsize(tfm);
	162
b426beb6 DH	163	/* We allocate the hash operational data storage on the end of the
b426beb6 DH	164	* digest storage space.
c26fd69f DH	165	*/
c26fd69f DH	166	ret = -ENOMEM;
b426beb6 DH	167	digest = kzalloc(digest_size + desc_size, GFP_KERNEL);
	168	if (!digest)
	169	goto error;
c26fd69f	170
b426beb6 DH	171	cert->sig.digest = digest;
b426beb6 DH	172	cert->sig.digest_size = digest_size;
c26fd69f	173
b426beb6 DH	174	desc = digest + digest_size;
	175	desc->tfm = tfm;
	176	desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
c26fd69f DH	177
	178	ret = crypto_shash_init(desc);
	179	if (ret < 0)
	180	goto error;
b426beb6 DH	181	might_sleep();
	182	ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, digest);
	183	error:
	184	crypto_free_shash(tfm);
	185	pr_devel("<==%s() = %d\n", __func__, ret);
	186	return ret;
	187	}
	188	EXPORT_SYMBOL_GPL(x509_get_sig_params);
c26fd69f	189
b426beb6 DH	190	/*
	191	* Check the signature on a certificate using the provided public key
	192	*/
	193	int x509_check_signature(const struct public_key *pub,
	194	struct x509_certificate *cert)
	195	{
	196	int ret;
c26fd69f	197
b426beb6	198	pr_devel("==>%s()\n", __func__);
c26fd69f	199
b426beb6 DH	200	ret = x509_get_sig_params(cert);
	201	if (ret < 0)
	202	return ret;
c26fd69f	203
b426beb6	204	ret = public_key_verify_signature(pub, &cert->sig);
41559420 DH	205	if (ret == -ENOPKG)
41559420 DH	206	cert->unsupported_crypto = true;
c26fd69f	207	pr_debug("Cert Verification: %d\n", ret);
c26fd69f DH	208	return ret;
c26fd69f DH	209	}
b426beb6	210	EXPORT_SYMBOL_GPL(x509_check_signature);
c26fd69f	211
3be4beaf MZ	212	/*
	213	* Check the new certificate against the ones in the trust keyring. If one of
	214	* those is the signing key and validates the new certificate, then mark the
	215	* new certificate as being trusted.
	216	*
	217	* Return 0 if the new certificate was successfully validated, 1 if we couldn't
	218	* find a matching parent certificate in the trusted list and an error if there
	219	* is a matching certificate but the signature check fails.
	220	*/
	221	static int x509_validate_trust(struct x509_certificate *cert,
	222	struct key *trust_keyring)
	223	{
3be4beaf MZ	224	struct key *key;
	225	int ret = 1;
	226
	227	if (!trust_keyring)
	228	return -EOPNOTSUPP;
	229
f1b731db	230	if (ca_keyid && !asymmetric_key_id_partial(cert->authority, ca_keyid))
ffb70f61 DK	231	return -EPERM;
ffb70f61 DK	232
f1b731db DK	233	key = x509_request_asymmetric_key(trust_keyring, cert->authority,
f1b731db DK	234	false);
3be4beaf	235	if (!IS_ERR(key)) {
32c4741c DK	236	if (!use_builtin_keys
	237	\|\| test_bit(KEY_FLAG_BUILTIN, &key->flags))
	238	ret = x509_check_signature(key->payload.data, cert);
3be4beaf MZ	239	key_put(key);
	240	}
	241	return ret;
	242	}
	243
c26fd69f DH	244	/*
	245	* Attempt to parse a data blob for a key as an X509 certificate.
	246	*/
	247	static int x509_key_preparse(struct key_preparsed_payload *prep)
	248	{
46963b77	249	struct asymmetric_key_ids *kids;
c26fd69f	250	struct x509_certificate *cert;
46963b77	251	const char *q;
c26fd69f	252	size_t srlen, sulen;
46963b77	253	char desc = NULL, p;
c26fd69f DH	254	int ret;
	255
	256	cert = x509_cert_parse(prep->data, prep->datalen);
	257	if (IS_ERR(cert))
	258	return PTR_ERR(cert);
	259
	260	pr_devel("Cert Issuer: %s\n", cert->issuer);
	261	pr_devel("Cert Subject: %s\n", cert->subject);
2ecdb23b DH	262
	263	if (cert->pub->pkey_algo >= PKEY_ALGO__LAST \|\|
	264	cert->sig.pkey_algo >= PKEY_ALGO__LAST \|\|
	265	cert->sig.pkey_hash_algo >= PKEY_HASH__LAST \|\|
	266	!pkey_algo[cert->pub->pkey_algo] \|\|
	267	!pkey_algo[cert->sig.pkey_algo] \|\|
3fe78ca2	268	!hash_algo_name[cert->sig.pkey_hash_algo]) {
2ecdb23b DH	269	ret = -ENOPKG;
	270	goto error_free_cert;
	271	}
	272
67f7d60b	273	pr_devel("Cert Key Algo: %s\n", pkey_algo_name[cert->pub->pkey_algo]);
2f1c4fef	274	pr_devel("Cert Valid From: %04ld-%02d-%02d %02d:%02d:%02d\n",
a5752d11 DH	275	cert->valid_from.tm_year + 1900, cert->valid_from.tm_mon + 1,
	276	cert->valid_from.tm_mday, cert->valid_from.tm_hour,
	277	cert->valid_from.tm_min, cert->valid_from.tm_sec);
2f1c4fef	278	pr_devel("Cert Valid To: %04ld-%02d-%02d %02d:%02d:%02d\n",
a5752d11 DH	279	cert->valid_to.tm_year + 1900, cert->valid_to.tm_mon + 1,
	280	cert->valid_to.tm_mday, cert->valid_to.tm_hour,
	281	cert->valid_to.tm_min, cert->valid_to.tm_sec);
c7c8bb23 DK	282	pr_devel("Cert Signature: %s + %s\n",
c7c8bb23 DK	283	pkey_algo_name[cert->sig.pkey_algo],
3fe78ca2	284	hash_algo_name[cert->sig.pkey_hash_algo]);
c26fd69f	285
67f7d60b	286	cert->pub->algo = pkey_algo[cert->pub->pkey_algo];
c26fd69f DH	287	cert->pub->id_type = PKEY_ID_X509;
c26fd69f DH	288
17334cab DH	289	/* Check the signature on the key if it appears to be self-signed */
17334cab DH	290	if (!cert->authority \|\|
46963b77	291	asymmetric_key_id_same(cert->skid, cert->authority)) {
3be4beaf	292	ret = x509_check_signature(cert->pub, cert); /* self-signed */
c26fd69f DH	293	if (ret < 0)
c26fd69f DH	294	goto error_free_cert;
3be4beaf MZ	295	} else if (!prep->trusted) {
	296	ret = x509_validate_trust(cert, get_system_trusted_keyring());
	297	if (!ret)
	298	prep->trusted = 1;
c26fd69f DH	299	}
	300
	301	/* Propose a description */
	302	sulen = strlen(cert->subject);
dd2f6c44 DH	303	if (cert->raw_skid) {
	304	srlen = cert->raw_skid_size;
	305	q = cert->raw_skid;
	306	} else {
	307	srlen = cert->raw_serial_size;
	308	q = cert->raw_serial;
	309	}
46963b77 DH	310	if (srlen > 1 && *q == 0) {
	311	srlen--;
	312	q++;
	313	}
	314
c26fd69f	315	ret = -ENOMEM;
46963b77	316	desc = kmalloc(sulen + 2 + srlen * 2 + 1, GFP_KERNEL);
c26fd69f DH	317	if (!desc)
c26fd69f DH	318	goto error_free_cert;
46963b77 DH	319	p = memcpy(desc, cert->subject, sulen);
	320	p += sulen;
	321	*p++ = ':';
	322	*p++ = ' ';
	323	p = bin2hex(p, q, srlen);
	324	*p = 0;
	325
	326	kids = kmalloc(sizeof(struct asymmetric_key_ids), GFP_KERNEL);
	327	if (!kids)
	328	goto error_free_desc;
	329	kids->id[0] = cert->id;
	330	kids->id[1] = cert->skid;
c26fd69f DH	331
	332	/* We're pinning the module by being linked against it */
	333	__module_get(public_key_subtype.owner);
	334	prep->type_data[0] = &public_key_subtype;
46963b77	335	prep->type_data[1] = kids;
fc7c70e0	336	prep->payload[0] = cert->pub;
c26fd69f DH	337	prep->description = desc;
	338	prep->quotalen = 100;
	339
	340	/* We've finished with the certificate */
	341	cert->pub = NULL;
46963b77 DH	342	cert->id = NULL;
46963b77 DH	343	cert->skid = NULL;
c26fd69f DH	344	desc = NULL;
	345	ret = 0;
	346
46963b77 DH	347	error_free_desc:
46963b77 DH	348	kfree(desc);
c26fd69f DH	349	error_free_cert:
	350	x509_free_certificate(cert);
	351	return ret;
	352	}
	353
	354	static struct asymmetric_key_parser x509_key_parser = {
	355	.owner = THIS_MODULE,
	356	.name = "x509",
	357	.parse = x509_key_preparse,
	358	};
	359
	360	/*
	361	* Module stuff
	362	*/
	363	static int __init x509_key_init(void)
	364	{
	365	return register_asymmetric_key_parser(&x509_key_parser);
	366	}
	367
	368	static void __exit x509_key_exit(void)
	369	{
	370	unregister_asymmetric_key_parser(&x509_key_parser);
	371	}
	372
	373	module_init(x509_key_init);
	374	module_exit(x509_key_exit);
e19aaa7d KK	375
	376	MODULE_DESCRIPTION("X.509 certificate parser");
	377	MODULE_LICENSE("GPL");