[linux-2.6-block.git] / crypto / asymmetric_keys / x509_cert_parser.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* X.509 certificate parser
 *
 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#define pr_fmt(fmt) "X.509: "fmt
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/oid_registry.h>
#include <crypto/public_key.h>
#include "x509_parser.h"
#include "x509.asn1.h"
#include "x509_akid.asn1.h"

struct x509_parse_context {
	struct x509_certificate	*cert;		/* Certificate being constructed */
	unsigned long	data;			/* Start of data */
	const void	*cert_start;		/* Start of cert content */
	const void	*key;			/* Key data */
	size_t		key_size;		/* Size of key data */
	const void	*params;		/* Key parameters */
	size_t		params_size;		/* Size of key parameters */
	enum OID	key_algo;		/* Public key algorithm */
	enum OID	last_oid;		/* Last OID encountered */
	enum OID	algo_oid;		/* Algorithm OID */
	unsigned char	nr_mpi;			/* Number of MPIs stored */
	u8		o_size;			/* Size of organizationName (O) */
	u8		cn_size;		/* Size of commonName (CN) */
	u8		email_size;		/* Size of emailAddress */
	u16		o_offset;		/* Offset of organizationName (O) */
	u16		cn_offset;		/* Offset of commonName (CN) */
	u16		email_offset;		/* Offset of emailAddress */
	unsigned	raw_akid_size;
	const void	*raw_akid;		/* Raw authorityKeyId in ASN.1 */
	const void	*akid_raw_issuer;	/* Raw directoryName in authorityKeyId */
	unsigned	akid_raw_issuer_size;
};

/*
 * Free an X.509 certificate
 */
void x509_free_certificate(struct x509_certificate *cert)
{
	if (cert) {
		public_key_free(cert->pub);
		public_key_signature_free(cert->sig);
		kfree(cert->issuer);
		kfree(cert->subject);
		kfree(cert->id);
		kfree(cert->skid);
		kfree(cert);
	}
}
EXPORT_SYMBOL_GPL(x509_free_certificate);

/*
 * Parse an X.509 certificate
 */
struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
{
	struct x509_certificate *cert;
	struct x509_parse_context *ctx;
	struct asymmetric_key_id *kid;
	long ret;

	ret = -ENOMEM;
	cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
	if (!cert)
		goto error_no_cert;
	cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
	if (!cert->pub)
		goto error_no_ctx;
	cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
	if (!cert->sig)
		goto error_no_ctx;
	ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
	if (!ctx)
		goto error_no_ctx;

	ctx->cert = cert;
	ctx->data = (unsigned long)data;

	/* Attempt to decode the certificate */
	ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
	if (ret < 0)
		goto error_decode;

	/* Decode the AuthorityKeyIdentifier */
	if (ctx->raw_akid) {
		pr_devel("AKID: %u %*phN\n",
			 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
		ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
				       ctx->raw_akid, ctx->raw_akid_size);
		if (ret < 0) {
			pr_warn("Couldn't decode AuthKeyIdentifier\n");
			goto error_decode;
		}
	}

	ret = -ENOMEM;
	cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
	if (!cert->pub->key)
		goto error_decode;

	cert->pub->keylen = ctx->key_size;

	cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
	if (!cert->pub->params)
		goto error_decode;

	cert->pub->paramlen = ctx->params_size;
	cert->pub->algo = ctx->key_algo;

	/* Grab the signature bits */
	ret = x509_get_sig_params(cert);
	if (ret < 0)
		goto error_decode;

	/* Generate cert issuer + serial number key ID */
	kid = asymmetric_key_generate_id(cert->raw_serial,
					 cert->raw_serial_size,
					 cert->raw_issuer,
					 cert->raw_issuer_size);
	if (IS_ERR(kid)) {
		ret = PTR_ERR(kid);
		goto error_decode;
	}
	cert->id = kid;

	/* Detect self-signed certificates */
	ret = x509_check_for_self_signed(cert);
	if (ret < 0)
		goto error_decode;

	kfree(ctx);
	return cert;

error_decode:
	kfree(ctx);
error_no_ctx:
	x509_free_certificate(cert);
error_no_cert:
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(x509_cert_parse);

/*
 * Note an OID when we find one for later processing when we know how
 * to interpret it.
 */
int x509_note_OID(void *context, size_t hdrlen,
	     unsigned char tag,
	     const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	ctx->last_oid = look_up_OID(value, vlen);
	if (ctx->last_oid == OID__NR) {
		char buffer[50];
		sprint_oid(value, vlen, buffer, sizeof(buffer));
		pr_debug("Unknown OID: [%lu] %s\n",
			 (unsigned long)value - ctx->data, buffer);
	}
	return 0;
}

/*
 * Save the position of the TBS data so that we can check the signature over it
 * later.
 */
int x509_note_tbs_certificate(void *context, size_t hdrlen,
			      unsigned char tag,
			      const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
		 hdrlen, tag, (unsigned long)value - ctx->data, vlen);

	ctx->cert->tbs = value - hdrlen;
	ctx->cert->tbs_size = vlen + hdrlen;
	return 0;
}

/*
 * Record the public key algorithm
 */
int x509_note_pkey_algo(void *context, size_t hdrlen,
			unsigned char tag,
			const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	pr_debug("PubKey Algo: %u\n", ctx->last_oid);

	switch (ctx->last_oid) {
	case OID_md2WithRSAEncryption:
	case OID_md3WithRSAEncryption:
	default:
		return -ENOPKG; /* Unsupported combination */

	case OID_md4WithRSAEncryption:
		ctx->cert->sig->hash_algo = "md4";
		goto rsa_pkcs1;

	case OID_sha1WithRSAEncryption:
		ctx->cert->sig->hash_algo = "sha1";
		goto rsa_pkcs1;

	case OID_sha256WithRSAEncryption:
		ctx->cert->sig->hash_algo = "sha256";
		goto rsa_pkcs1;

	case OID_sha384WithRSAEncryption:
		ctx->cert->sig->hash_algo = "sha384";
		goto rsa_pkcs1;

	case OID_sha512WithRSAEncryption:
		ctx->cert->sig->hash_algo = "sha512";
		goto rsa_pkcs1;

	case OID_sha224WithRSAEncryption:
		ctx->cert->sig->hash_algo = "sha224";
		goto rsa_pkcs1;

	case OID_gost2012Signature256:
		ctx->cert->sig->hash_algo = "streebog256";
		goto ecrdsa;

	case OID_gost2012Signature512:
		ctx->cert->sig->hash_algo = "streebog512";
		goto ecrdsa;
	}

rsa_pkcs1:
	ctx->cert->sig->pkey_algo = "rsa";
	ctx->cert->sig->encoding = "pkcs1";
	ctx->algo_oid = ctx->last_oid;
	return 0;
ecrdsa:
	ctx->cert->sig->pkey_algo = "ecrdsa";
	ctx->cert->sig->encoding = "raw";
	ctx->algo_oid = ctx->last_oid;
	return 0;
}

/*
 * Note the whereabouts and type of the signature.
 */
int x509_note_signature(void *context, size_t hdrlen,
			unsigned char tag,
			const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);

	if (ctx->last_oid != ctx->algo_oid) {
		pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
			ctx->algo_oid, ctx->last_oid);
		return -EINVAL;
	}

	if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
	    strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) {
		/* Discard the BIT STRING metadata */
		if (vlen < 1 || *(const u8 *)value != 0)
			return -EBADMSG;

		value++;
		vlen--;
	}

	ctx->cert->raw_sig = value;
	ctx->cert->raw_sig_size = vlen;
	return 0;
}

/*
 * Note the certificate serial number
 */
int x509_note_serial(void *context, size_t hdrlen,
		     unsigned char tag,
		     const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	ctx->cert->raw_serial = value;
	ctx->cert->raw_serial_size = vlen;
	return 0;
}

/*
 * Note some of the name segments from which we'll fabricate a name.
 */
int x509_extract_name_segment(void *context, size_t hdrlen,
			      unsigned char tag,
			      const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	switch (ctx->last_oid) {
	case OID_commonName:
		ctx->cn_size = vlen;
		ctx->cn_offset = (unsigned long)value - ctx->data;
		break;
	case OID_organizationName:
		ctx->o_size = vlen;
		ctx->o_offset = (unsigned long)value - ctx->data;
		break;
	case OID_email_address:
		ctx->email_size = vlen;
		ctx->email_offset = (unsigned long)value - ctx->data;
		break;
	default:
		break;
	}

	return 0;
}

/*
 * Fabricate and save the issuer and subject names
 */
static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
			       unsigned char tag,
			       char **_name, size_t vlen)
{
	const void *name, *data = (const void *)ctx->data;
	size_t namesize;
	char *buffer;

	if (*_name)
		return -EINVAL;

	/* Empty name string if no material */
	if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
		buffer = kmalloc(1, GFP_KERNEL);
		if (!buffer)
			return -ENOMEM;
		buffer[0] = 0;
		goto done;
	}

	if (ctx->cn_size && ctx->o_size) {
		/* Consider combining O and CN, but use only the CN if it is
		 * prefixed by the O, or a significant portion thereof.
		 */
		namesize = ctx->cn_size;
		name = data + ctx->cn_offset;
		if (ctx->cn_size >= ctx->o_size &&
		    memcmp(data + ctx->cn_offset, data + ctx->o_offset,
			   ctx->o_size) == 0)
			goto single_component;
		if (ctx->cn_size >= 7 &&
		    ctx->o_size >= 7 &&
		    memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
			goto single_component;

		buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
				 GFP_KERNEL);
		if (!buffer)
			return -ENOMEM;

		memcpy(buffer,
		       data + ctx->o_offset, ctx->o_size);
		buffer[ctx->o_size + 0] = ':';
		buffer[ctx->o_size + 1] = ' ';
		memcpy(buffer + ctx->o_size + 2,
		       data + ctx->cn_offset, ctx->cn_size);
		buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
		goto done;

	} else if (ctx->cn_size) {
		namesize = ctx->cn_size;
		name = data + ctx->cn_offset;
	} else if (ctx->o_size) {
		namesize = ctx->o_size;
		name = data + ctx->o_offset;
	} else {
		namesize = ctx->email_size;
		name = data + ctx->email_offset;
	}

single_component:
	buffer = kmalloc(namesize + 1, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;
	memcpy(buffer, name, namesize);
	buffer[namesize] = 0;

done:
	*_name = buffer;
	ctx->cn_size = 0;
	ctx->o_size = 0;
	ctx->email_size = 0;
	return 0;
}

int x509_note_issuer(void *context, size_t hdrlen,
		     unsigned char tag,
		     const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	ctx->cert->raw_issuer = value;
	ctx->cert->raw_issuer_size = vlen;
	return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
}

int x509_note_subject(void *context, size_t hdrlen,
		      unsigned char tag,
		      const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	ctx->cert->raw_subject = value;
	ctx->cert->raw_subject_size = vlen;
	return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
}

/*
 * Extract the parameters for the public key
 */
int x509_note_params(void *context, size_t hdrlen,
		     unsigned char tag,
		     const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	/*
	 * AlgorithmIdentifier is used three times in the x509, we should skip
	 * first and ignore third, using second one which is after subject and
	 * before subjectPublicKey.
	 */
	if (!ctx->cert->raw_subject || ctx->key)
		return 0;
	ctx->params = value - hdrlen;
	ctx->params_size = vlen + hdrlen;
	return 0;
}

/*
 * Extract the data for the public key algorithm
 */
int x509_extract_key_data(void *context, size_t hdrlen,
			  unsigned char tag,
			  const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	ctx->key_algo = ctx->last_oid;
	if (ctx->last_oid == OID_rsaEncryption)
		ctx->cert->pub->pkey_algo = "rsa";
	else if (ctx->last_oid == OID_gost2012PKey256 ||
		 ctx->last_oid == OID_gost2012PKey512)
		ctx->cert->pub->pkey_algo = "ecrdsa";
	else
		return -ENOPKG;

	/* Discard the BIT STRING metadata */
	if (vlen < 1 || *(const u8 *)value != 0)
		return -EBADMSG;
	ctx->key = value + 1;
	ctx->key_size = vlen - 1;
	return 0;
}

/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
#define SEQ_TAG_KEYID (ASN1_CONT << 6)

/*
 * Process certificate extensions that are used to qualify the certificate.
 */
int x509_process_extension(void *context, size_t hdrlen,
			   unsigned char tag,
			   const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	struct asymmetric_key_id *kid;
	const unsigned char *v = value;

	pr_debug("Extension: %u\n", ctx->last_oid);

	if (ctx->last_oid == OID_subjectKeyIdentifier) {
		/* Get hold of the key fingerprint */
		if (ctx->cert->skid || vlen < 3)
			return -EBADMSG;
		if (v[0] != ASN1_OTS || v[1] != vlen - 2)
			return -EBADMSG;
		v += 2;
		vlen -= 2;

		ctx->cert->raw_skid_size = vlen;
		ctx->cert->raw_skid = v;
		kid = asymmetric_key_generate_id(v, vlen, "", 0);
		if (IS_ERR(kid))
			return PTR_ERR(kid);
		ctx->cert->skid = kid;
		pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
		return 0;
	}

	if (ctx->last_oid == OID_authorityKeyIdentifier) {
		/* Get hold of the CA key fingerprint */
		ctx->raw_akid = v;
		ctx->raw_akid_size = vlen;
		return 0;
	}

	return 0;
}

/**
 * x509_decode_time - Decode an X.509 time ASN.1 object
 * @_t: The time to fill in
 * @hdrlen: The length of the object header
 * @tag: The object tag
 * @value: The object value
 * @vlen: The size of the object value
 *
 * Decode an ASN.1 universal time or generalised time field into a struct the
 * kernel can handle and check it for validity.  The time is decoded thus:
 *
 *	[RFC5280 §4.1.2.5]
 *	CAs conforming to this profile MUST always encode certificate validity
 *	dates through the year 2049 as UTCTime; certificate validity dates in
 *	2050 or later MUST be encoded as GeneralizedTime.  Conforming
 *	applications MUST be able to process validity dates that are encoded in
 *	either UTCTime or GeneralizedTime.
 */
int x509_decode_time(time64_t *_t,  size_t hdrlen,
		     unsigned char tag,
		     const unsigned char *value, size_t vlen)
{
	static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
						       31, 31, 30, 31, 30, 31 };
	const unsigned char *p = value;
	unsigned year, mon, day, hour, min, sec, mon_len;

#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })

	if (tag == ASN1_UNITIM) {
		/* UTCTime: YYMMDDHHMMSSZ */
		if (vlen != 13)
			goto unsupported_time;
		year = DD2bin(p);
		if (year >= 50)
			year += 1900;
		else
			year += 2000;
	} else if (tag == ASN1_GENTIM) {
		/* GenTime: YYYYMMDDHHMMSSZ */
		if (vlen != 15)
			goto unsupported_time;
		year = DD2bin(p) * 100 + DD2bin(p);
		if (year >= 1950 && year <= 2049)
			goto invalid_time;
	} else {
		goto unsupported_time;
	}

	mon  = DD2bin(p);
	day = DD2bin(p);
	hour = DD2bin(p);
	min  = DD2bin(p);
	sec  = DD2bin(p);

	if (*p != 'Z')
		goto unsupported_time;

	if (year < 1970 ||
	    mon < 1 || mon > 12)
		goto invalid_time;

	mon_len = month_lengths[mon - 1];
	if (mon == 2) {
		if (year % 4 == 0) {
			mon_len = 29;
			if (year % 100 == 0) {
				mon_len = 28;
				if (year % 400 == 0)
					mon_len = 29;
			}
		}
	}

	if (day < 1 || day > mon_len ||
	    hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
	    min > 59 ||
	    sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
		goto invalid_time;

	*_t = mktime64(year, mon, day, hour, min, sec);
	return 0;

unsupported_time:
	pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
		 tag, (int)vlen, value);
	return -EBADMSG;
invalid_time:
	pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
		 tag, (int)vlen, value);
	return -EBADMSG;
}
EXPORT_SYMBOL_GPL(x509_decode_time);

int x509_note_not_before(void *context, size_t hdrlen,
			 unsigned char tag,
			 const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
}

int x509_note_not_after(void *context, size_t hdrlen,
			unsigned char tag,
			const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
}

/*
 * Note a key identifier-based AuthorityKeyIdentifier
 */
int x509_akid_note_kid(void *context, size_t hdrlen,
		       unsigned char tag,
		       const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	struct asymmetric_key_id *kid;

	pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);

	if (ctx->cert->sig->auth_ids[1])
		return 0;

	kid = asymmetric_key_generate_id(value, vlen, "", 0);
	if (IS_ERR(kid))
		return PTR_ERR(kid);
	pr_debug("authkeyid %*phN\n", kid->len, kid->data);
	ctx->cert->sig->auth_ids[1] = kid;
	return 0;
}

/*
 * Note a directoryName in an AuthorityKeyIdentifier
 */
int x509_akid_note_name(void *context, size_t hdrlen,
			unsigned char tag,
			const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;

	pr_debug("AKID: name: %*phN\n", (int)vlen, value);

	ctx->akid_raw_issuer = value;
	ctx->akid_raw_issuer_size = vlen;
	return 0;
}

/*
 * Note a serial number in an AuthorityKeyIdentifier
 */
int x509_akid_note_serial(void *context, size_t hdrlen,
			  unsigned char tag,
			  const void *value, size_t vlen)
{
	struct x509_parse_context *ctx = context;
	struct asymmetric_key_id *kid;

	pr_debug("AKID: serial: %*phN\n", (int)vlen, value);

	if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
		return 0;

	kid = asymmetric_key_generate_id(value,
					 vlen,
					 ctx->akid_raw_issuer,
					 ctx->akid_raw_issuer_size);
	if (IS_ERR(kid))
		return PTR_ERR(kid);

	pr_debug("authkeyid %*phN\n", kid->len, kid->data);
	ctx->cert->sig->auth_ids[0] = kid;
	return 0;
}
Commit	Line	Data
b4d0d230	1	// SPDX-License-Identifier: GPL-2.0-or-later
c26fd69f DH	2	/* X.509 certificate parser
	3	*
	4	* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells (dhowells@redhat.com)
c26fd69f DH	6	*/
	7
	8	#define pr_fmt(fmt) "X.509: "fmt
	9	#include <linux/kernel.h>
ace0107a	10	#include <linux/export.h>
c26fd69f DH	11	#include <linux/slab.h>
	12	#include <linux/err.h>
	13	#include <linux/oid_registry.h>
db6c43bd	14	#include <crypto/public_key.h>
c26fd69f	15	#include "x509_parser.h"
4fa8bc94 MY	16	#include "x509.asn1.h"
4fa8bc94 MY	17	#include "x509_akid.asn1.h"
c26fd69f DH	18
	19	struct x509_parse_context {
	20	struct x509_certificate cert; / Certificate being constructed */
	21	unsigned long data; /* Start of data */
	22	const void cert_start; / Start of cert content */
	23	const void key; / Key data */
	24	size_t key_size; /* Size of key data */
f1774cb8 VC	25	const void params; / Key parameters */
	26	size_t params_size; /* Size of key parameters */
	27	enum OID key_algo; /* Public key algorithm */
c26fd69f DH	28	enum OID last_oid; /* Last OID encountered */
	29	enum OID algo_oid; /* Algorithm OID */
	30	unsigned char nr_mpi; /* Number of MPIs stored */
	31	u8 o_size; /* Size of organizationName (O) */
	32	u8 cn_size; /* Size of commonName (CN) */
	33	u8 email_size; /* Size of emailAddress */
	34	u16 o_offset; /* Offset of organizationName (O) */
	35	u16 cn_offset; /* Offset of commonName (CN) */
	36	u16 email_offset; /* Offset of emailAddress */
b92e6570 DH	37	unsigned raw_akid_size;
	38	const void raw_akid; / Raw authorityKeyId in ASN.1 */
	39	const void akid_raw_issuer; / Raw directoryName in authorityKeyId */
	40	unsigned akid_raw_issuer_size;
c26fd69f DH	41	};
	42
	43	/*
	44	* Free an X.509 certificate
	45	*/
	46	void x509_free_certificate(struct x509_certificate *cert)
	47	{
	48	if (cert) {
3b764563	49	public_key_free(cert->pub);
77d0910d	50	public_key_signature_free(cert->sig);
c26fd69f DH	51	kfree(cert->issuer);
c26fd69f DH	52	kfree(cert->subject);
46963b77 DH	53	kfree(cert->id);
46963b77 DH	54	kfree(cert->skid);
c26fd69f DH	55	kfree(cert);
	56	}
	57	}
ace0107a	58	EXPORT_SYMBOL_GPL(x509_free_certificate);
c26fd69f DH	59
	60	/*
	61	* Parse an X.509 certificate
	62	*/
	63	struct x509_certificate x509_cert_parse(const void data, size_t datalen)
	64	{
	65	struct x509_certificate *cert;
	66	struct x509_parse_context *ctx;
46963b77	67	struct asymmetric_key_id *kid;
c26fd69f DH	68	long ret;
	69
	70	ret = -ENOMEM;
	71	cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
	72	if (!cert)
	73	goto error_no_cert;
	74	cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
	75	if (!cert->pub)
	76	goto error_no_ctx;
77d0910d DH	77	cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
	78	if (!cert->sig)
	79	goto error_no_ctx;
c26fd69f DH	80	ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
	81	if (!ctx)
	82	goto error_no_ctx;
	83
	84	ctx->cert = cert;
	85	ctx->data = (unsigned long)data;
	86
	87	/* Attempt to decode the certificate */
	88	ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
	89	if (ret < 0)
	90	goto error_decode;
	91
b92e6570 DH	92	/* Decode the AuthorityKeyIdentifier */
	93	if (ctx->raw_akid) {
	94	pr_devel("AKID: %u %*phN\n",
	95	ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
	96	ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
	97	ctx->raw_akid, ctx->raw_akid_size);
	98	if (ret < 0) {
	99	pr_warn("Couldn't decode AuthKeyIdentifier\n");
	100	goto error_decode;
	101	}
	102	}
	103
4e880168	104	ret = -ENOMEM;
db6c43bd TS	105	cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
db6c43bd TS	106	if (!cert->pub->key)
c26fd69f DH	107	goto error_decode;
c26fd69f DH	108
db6c43bd TS	109	cert->pub->keylen = ctx->key_size;
db6c43bd TS	110
f1774cb8 VC	111	cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
	112	if (!cert->pub->params)
	113	goto error_decode;
	114
	115	cert->pub->paramlen = ctx->params_size;
	116	cert->pub->algo = ctx->key_algo;
	117
6c2dc5ae DH	118	/* Grab the signature bits */
	119	ret = x509_get_sig_params(cert);
	120	if (ret < 0)
	121	goto error_decode;
	122
46963b77 DH	123	/* Generate cert issuer + serial number key ID */
	124	kid = asymmetric_key_generate_id(cert->raw_serial,
	125	cert->raw_serial_size,
	126	cert->raw_issuer,
	127	cert->raw_issuer_size);
	128	if (IS_ERR(kid)) {
	129	ret = PTR_ERR(kid);
	130	goto error_decode;
	131	}
	132	cert->id = kid;
	133
6c2dc5ae DH	134	/* Detect self-signed certificates */
	135	ret = x509_check_for_self_signed(cert);
	136	if (ret < 0)
	137	goto error_decode;
	138
c26fd69f DH	139	kfree(ctx);
	140	return cert;
	141
	142	error_decode:
	143	kfree(ctx);
	144	error_no_ctx:
	145	x509_free_certificate(cert);
	146	error_no_cert:
	147	return ERR_PTR(ret);
	148	}
ace0107a	149	EXPORT_SYMBOL_GPL(x509_cert_parse);
c26fd69f DH	150
	151	/*
	152	* Note an OID when we find one for later processing when we know how
	153	* to interpret it.
	154	*/
	155	int x509_note_OID(void *context, size_t hdrlen,
	156	unsigned char tag,
	157	const void *value, size_t vlen)
	158	{
	159	struct x509_parse_context *ctx = context;
	160
	161	ctx->last_oid = look_up_OID(value, vlen);
	162	if (ctx->last_oid == OID__NR) {
	163	char buffer[50];
	164	sprint_oid(value, vlen, buffer, sizeof(buffer));
cf75446e	165	pr_debug("Unknown OID: [%lu] %s\n",
c26fd69f DH	166	(unsigned long)value - ctx->data, buffer);
	167	}
	168	return 0;
	169	}
	170
	171	/*
	172	* Save the position of the TBS data so that we can check the signature over it
	173	* later.
	174	*/
	175	int x509_note_tbs_certificate(void *context, size_t hdrlen,
	176	unsigned char tag,
	177	const void *value, size_t vlen)
	178	{
	179	struct x509_parse_context *ctx = context;
	180
	181	pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
	182	hdrlen, tag, (unsigned long)value - ctx->data, vlen);
	183
	184	ctx->cert->tbs = value - hdrlen;
	185	ctx->cert->tbs_size = vlen + hdrlen;
	186	return 0;
	187	}
	188
	189	/*
	190	* Record the public key algorithm
	191	*/
	192	int x509_note_pkey_algo(void *context, size_t hdrlen,
	193	unsigned char tag,
	194	const void *value, size_t vlen)
	195	{
	196	struct x509_parse_context *ctx = context;
	197
	198	pr_debug("PubKey Algo: %u\n", ctx->last_oid);
	199
	200	switch (ctx->last_oid) {
	201	case OID_md2WithRSAEncryption:
	202	case OID_md3WithRSAEncryption:
	203	default:
	204	return -ENOPKG; /* Unsupported combination */
	205
	206	case OID_md4WithRSAEncryption:
77d0910d	207	ctx->cert->sig->hash_algo = "md4";
03988490	208	goto rsa_pkcs1;
c26fd69f DH	209
c26fd69f DH	210	case OID_sha1WithRSAEncryption:
77d0910d	211	ctx->cert->sig->hash_algo = "sha1";
03988490	212	goto rsa_pkcs1;
c26fd69f DH	213
c26fd69f DH	214	case OID_sha256WithRSAEncryption:
77d0910d	215	ctx->cert->sig->hash_algo = "sha256";
03988490	216	goto rsa_pkcs1;
c26fd69f DH	217
c26fd69f DH	218	case OID_sha384WithRSAEncryption:
77d0910d	219	ctx->cert->sig->hash_algo = "sha384";
03988490	220	goto rsa_pkcs1;
c26fd69f DH	221
c26fd69f DH	222	case OID_sha512WithRSAEncryption:
77d0910d	223	ctx->cert->sig->hash_algo = "sha512";
03988490	224	goto rsa_pkcs1;
c26fd69f DH	225
c26fd69f DH	226	case OID_sha224WithRSAEncryption:
77d0910d	227	ctx->cert->sig->hash_algo = "sha224";
03988490	228	goto rsa_pkcs1;
0d7a7864 VC	229
	230	case OID_gost2012Signature256:
	231	ctx->cert->sig->hash_algo = "streebog256";
	232	goto ecrdsa;
	233
	234	case OID_gost2012Signature512:
	235	ctx->cert->sig->hash_algo = "streebog512";
	236	goto ecrdsa;
c26fd69f DH	237	}
c26fd69f DH	238
03988490 DH	239	rsa_pkcs1:
	240	ctx->cert->sig->pkey_algo = "rsa";
	241	ctx->cert->sig->encoding = "pkcs1";
c26fd69f DH	242	ctx->algo_oid = ctx->last_oid;
c26fd69f DH	243	return 0;
0d7a7864 VC	244	ecrdsa:
	245	ctx->cert->sig->pkey_algo = "ecrdsa";
	246	ctx->cert->sig->encoding = "raw";
	247	ctx->algo_oid = ctx->last_oid;
	248	return 0;
c26fd69f DH	249	}
	250
	251	/*
	252	* Note the whereabouts and type of the signature.
	253	*/
	254	int x509_note_signature(void *context, size_t hdrlen,
	255	unsigned char tag,
	256	const void *value, size_t vlen)
	257	{
	258	struct x509_parse_context *ctx = context;
	259
	260	pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);
	261
	262	if (ctx->last_oid != ctx->algo_oid) {
	263	pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
	264	ctx->algo_oid, ctx->last_oid);
	265	return -EINVAL;
	266	}
	267
0d7a7864 VC	268	if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 \|\|
0d7a7864 VC	269	strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) {
b65c32ec MS	270	/* Discard the BIT STRING metadata */
	271	if (vlen < 1 \|\| (const u8 )value != 0)
	272	return -EBADMSG;
	273
	274	value++;
	275	vlen--;
	276	}
	277
b426beb6 DH	278	ctx->cert->raw_sig = value;
b426beb6 DH	279	ctx->cert->raw_sig_size = vlen;
c26fd69f DH	280	return 0;
	281	}
	282
84aabd46 DH	283	/*
	284	* Note the certificate serial number
	285	*/
	286	int x509_note_serial(void *context, size_t hdrlen,
	287	unsigned char tag,
	288	const void *value, size_t vlen)
	289	{
	290	struct x509_parse_context *ctx = context;
	291	ctx->cert->raw_serial = value;
	292	ctx->cert->raw_serial_size = vlen;
	293	return 0;
	294	}
	295
c26fd69f DH	296	/*
	297	* Note some of the name segments from which we'll fabricate a name.
	298	*/
	299	int x509_extract_name_segment(void *context, size_t hdrlen,
	300	unsigned char tag,
	301	const void *value, size_t vlen)
	302	{
	303	struct x509_parse_context *ctx = context;
	304
	305	switch (ctx->last_oid) {
	306	case OID_commonName:
	307	ctx->cn_size = vlen;
	308	ctx->cn_offset = (unsigned long)value - ctx->data;
	309	break;
	310	case OID_organizationName:
	311	ctx->o_size = vlen;
	312	ctx->o_offset = (unsigned long)value - ctx->data;
	313	break;
	314	case OID_email_address:
	315	ctx->email_size = vlen;
	316	ctx->email_offset = (unsigned long)value - ctx->data;
	317	break;
	318	default:
	319	break;
	320	}
	321
	322	return 0;
	323	}
	324
	325	/*
	326	* Fabricate and save the issuer and subject names
	327	*/
	328	static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
	329	unsigned char tag,
	330	char **_name, size_t vlen)
	331	{
	332	const void name, data = (const void *)ctx->data;
	333	size_t namesize;
	334	char *buffer;
	335
	336	if (*_name)
	337	return -EINVAL;
	338
	339	/* Empty name string if no material */
	340	if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
	341	buffer = kmalloc(1, GFP_KERNEL);
	342	if (!buffer)
	343	return -ENOMEM;
	344	buffer[0] = 0;
	345	goto done;
	346	}
	347
	348	if (ctx->cn_size && ctx->o_size) {
	349	/* Consider combining O and CN, but use only the CN if it is
	350	* prefixed by the O, or a significant portion thereof.
	351	*/
	352	namesize = ctx->cn_size;
	353	name = data + ctx->cn_offset;
	354	if (ctx->cn_size >= ctx->o_size &&
	355	memcmp(data + ctx->cn_offset, data + ctx->o_offset,
	356	ctx->o_size) == 0)
	357	goto single_component;
	358	if (ctx->cn_size >= 7 &&
	359	ctx->o_size >= 7 &&
360	memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
361	goto single_component;
362
363	buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
364	GFP_KERNEL);
365	if (!buffer)
366	return -ENOMEM;
367
368	memcpy(buffer,
369	data + ctx->o_offset, ctx->o_size);
370	buffer[ctx->o_size + 0] = ':';
371	buffer[ctx->o_size + 1] = ' ';
372	memcpy(buffer + ctx->o_size + 2,
373	data + ctx->cn_offset, ctx->cn_size);
374	buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
375	goto done;
376
377	} else if (ctx->cn_size) {
378	namesize = ctx->cn_size;
379	name = data + ctx->cn_offset;
380	} else if (ctx->o_size) {
381	namesize = ctx->o_size;
382	name = data + ctx->o_offset;
383	} else {
384	namesize = ctx->email_size;
385	name = data + ctx->email_offset;
386	}
387
388	single_component:
389	buffer = kmalloc(namesize + 1, GFP_KERNEL);
390	if (!buffer)
391	return -ENOMEM;
392	memcpy(buffer, name, namesize);
393	buffer[namesize] = 0;
394
395	done:
396	*_name = buffer;
397	ctx->cn_size = 0;
398	ctx->o_size = 0;
399	ctx->email_size = 0;
400	return 0;
401	}
402
403	int x509_note_issuer(void *context, size_t hdrlen,
404	unsigned char tag,
405	const void *value, size_t vlen)
406	{
407	struct x509_parse_context *ctx = context;
84aabd46 DH	408	ctx->cert->raw_issuer = value;
84aabd46 DH	409	ctx->cert->raw_issuer_size = vlen;
c26fd69f DH	410	return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
	411	}
	412
	413	int x509_note_subject(void *context, size_t hdrlen,
	414	unsigned char tag,
	415	const void *value, size_t vlen)
	416	{
	417	struct x509_parse_context *ctx = context;
84aabd46 DH	418	ctx->cert->raw_subject = value;
84aabd46 DH	419	ctx->cert->raw_subject_size = vlen;
c26fd69f DH	420	return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
	421	}
	422
f1774cb8 VC	423	/*
	424	* Extract the parameters for the public key
	425	*/
	426	int x509_note_params(void *context, size_t hdrlen,
	427	unsigned char tag,
	428	const void *value, size_t vlen)
	429	{
	430	struct x509_parse_context *ctx = context;
	431
	432	/*
	433	* AlgorithmIdentifier is used three times in the x509, we should skip
	434	* first and ignore third, using second one which is after subject and
	435	* before subjectPublicKey.
	436	*/
	437	if (!ctx->cert->raw_subject \|\| ctx->key)
	438	return 0;
	439	ctx->params = value - hdrlen;
	440	ctx->params_size = vlen + hdrlen;
	441	return 0;
	442	}
	443
c26fd69f DH	444	/*
	445	* Extract the data for the public key algorithm
	446	*/
	447	int x509_extract_key_data(void *context, size_t hdrlen,
	448	unsigned char tag,
	449	const void *value, size_t vlen)
	450	{
	451	struct x509_parse_context *ctx = context;
	452
0d7a7864 VC	453	ctx->key_algo = ctx->last_oid;
	454	if (ctx->last_oid == OID_rsaEncryption)
	455	ctx->cert->pub->pkey_algo = "rsa";
	456	else if (ctx->last_oid == OID_gost2012PKey256 \|\|
	457	ctx->last_oid == OID_gost2012PKey512)
	458	ctx->cert->pub->pkey_algo = "ecrdsa";
	459	else
c26fd69f DH	460	return -ENOPKG;
c26fd69f DH	461
67f7d60b	462	/* Discard the BIT STRING metadata */
0f30cbea EB	463	if (vlen < 1 \|\| (const u8 )value != 0)
0f30cbea EB	464	return -EBADMSG;
c26fd69f DH	465	ctx->key = value + 1;
	466	ctx->key_size = vlen - 1;
	467	return 0;
	468	}
	469
04b00bdb CYL	470	/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
	471	#define SEQ_TAG_KEYID (ASN1_CONT << 6)
	472
c26fd69f DH	473	/*
	474	* Process certificate extensions that are used to qualify the certificate.
	475	*/
	476	int x509_process_extension(void *context, size_t hdrlen,
	477	unsigned char tag,
	478	const void *value, size_t vlen)
	479	{
	480	struct x509_parse_context *ctx = context;
46963b77	481	struct asymmetric_key_id *kid;
c26fd69f	482	const unsigned char *v = value;
c26fd69f DH	483
	484	pr_debug("Extension: %u\n", ctx->last_oid);
	485
	486	if (ctx->last_oid == OID_subjectKeyIdentifier) {
	487	/* Get hold of the key fingerprint */
46963b77	488	if (ctx->cert->skid \|\| vlen < 3)
c26fd69f DH	489	return -EBADMSG;
	490	if (v[0] != ASN1_OTS \|\| v[1] != vlen - 2)
	491	return -EBADMSG;
	492	v += 2;
	493	vlen -= 2;
	494
dd2f6c44 DH	495	ctx->cert->raw_skid_size = vlen;
dd2f6c44 DH	496	ctx->cert->raw_skid = v;
a4c6e57f	497	kid = asymmetric_key_generate_id(v, vlen, "", 0);
46963b77 DH	498	if (IS_ERR(kid))
	499	return PTR_ERR(kid);
	500	ctx->cert->skid = kid;
	501	pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
c26fd69f DH	502	return 0;
	503	}
	504
	505	if (ctx->last_oid == OID_authorityKeyIdentifier) {
	506	/* Get hold of the CA key fingerprint */
b92e6570 DH	507	ctx->raw_akid = v;
b92e6570 DH	508	ctx->raw_akid_size = vlen;
c26fd69f DH	509	return 0;
	510	}
	511
	512	return 0;
	513	}
	514
fd19a3d1 DH	515	/**
	516	* x509_decode_time - Decode an X.509 time ASN.1 object
	517	* @_t: The time to fill in
	518	* @hdrlen: The length of the object header
	519	* @tag: The object tag
	520	* @value: The object value
	521	* @vlen: The size of the object value
	522	*
	523	* Decode an ASN.1 universal time or generalised time field into a struct the
	524	* kernel can handle and check it for validity. The time is decoded thus:
	525	*
	526	* [RFC5280 §4.1.2.5]
	527	* CAs conforming to this profile MUST always encode certificate validity
	528	* dates through the year 2049 as UTCTime; certificate validity dates in
	529	* 2050 or later MUST be encoded as GeneralizedTime. Conforming
	530	* applications MUST be able to process validity dates that are encoded in
	531	* either UTCTime or GeneralizedTime.
c26fd69f	532	*/
fd19a3d1 DH	533	int x509_decode_time(time64_t *_t, size_t hdrlen,
	534	unsigned char tag,
	535	const unsigned char *value, size_t vlen)
c26fd69f	536	{
ac4cbedf	537	static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
fd19a3d1	538	31, 31, 30, 31, 30, 31 };
c26fd69f	539	const unsigned char *p = value;
fd19a3d1	540	unsigned year, mon, day, hour, min, sec, mon_len;
c26fd69f	541
fd19a3d1	542	#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
c26fd69f DH	543	#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
	544
	545	if (tag == ASN1_UNITIM) {
	546	/* UTCTime: YYMMDDHHMMSSZ */
	547	if (vlen != 13)
	548	goto unsupported_time;
fd19a3d1 DH	549	year = DD2bin(p);
	550	if (year >= 50)
	551	year += 1900;
c26fd69f	552	else
fd19a3d1	553	year += 2000;
c26fd69f DH	554	} else if (tag == ASN1_GENTIM) {
	555	/* GenTime: YYYYMMDDHHMMSSZ */
	556	if (vlen != 15)
	557	goto unsupported_time;
fd19a3d1 DH	558	year = DD2bin(p) * 100 + DD2bin(p);
	559	if (year >= 1950 && year <= 2049)
	560	goto invalid_time;
c26fd69f DH	561	} else {
	562	goto unsupported_time;
	563	}
	564
fd19a3d1 DH	565	mon = DD2bin(p);
	566	day = DD2bin(p);
	567	hour = DD2bin(p);
	568	min = DD2bin(p);
	569	sec = DD2bin(p);
c26fd69f DH	570
	571	if (*p != 'Z')
	572	goto unsupported_time;
	573
cc25b994 DH	574	if (year < 1970 \|\|
	575	mon < 1 \|\| mon > 12)
	576	goto invalid_time;
	577
	578	mon_len = month_lengths[mon - 1];
fd19a3d1 DH	579	if (mon == 2) {
	580	if (year % 4 == 0) {
	581	mon_len = 29;
	582	if (year % 100 == 0) {
ac4cbedf DH	583	mon_len = 28;
	584	if (year % 400 == 0)
	585	mon_len = 29;
fd19a3d1 DH	586	}
	587	}
	588	}
	589
cc25b994	590	if (day < 1 \|\| day > mon_len \|\|
7650cb80	591	hour > 24 \|\| /* ISO 8601 permits 24:00:00 as midnight tomorrow */
4dd17c9c	592	min > 59 \|\|
da02559c	593	sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
fd19a3d1	594	goto invalid_time;
cc25b994	595
fd19a3d1	596	*_t = mktime64(year, mon, day, hour, min, sec);
c26fd69f DH	597	return 0;
	598
	599	unsupported_time:
fd19a3d1 DH	600	pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
	601	tag, (int)vlen, value);
	602	return -EBADMSG;
	603	invalid_time:
	604	pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
	605	tag, (int)vlen, value);
c26fd69f DH	606	return -EBADMSG;
c26fd69f DH	607	}
fd19a3d1	608	EXPORT_SYMBOL_GPL(x509_decode_time);
c26fd69f DH	609
	610	int x509_note_not_before(void *context, size_t hdrlen,
	611	unsigned char tag,
	612	const void *value, size_t vlen)
	613	{
	614	struct x509_parse_context *ctx = context;
fd19a3d1	615	return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
c26fd69f DH	616	}
	617
	618	int x509_note_not_after(void *context, size_t hdrlen,
	619	unsigned char tag,
	620	const void *value, size_t vlen)
	621	{
	622	struct x509_parse_context *ctx = context;
fd19a3d1	623	return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
c26fd69f	624	}
b92e6570 DH	625
	626	/*
	627	* Note a key identifier-based AuthorityKeyIdentifier
	628	*/
	629	int x509_akid_note_kid(void *context, size_t hdrlen,
	630	unsigned char tag,
	631	const void *value, size_t vlen)
	632	{
	633	struct x509_parse_context *ctx = context;
	634	struct asymmetric_key_id *kid;
	635
	636	pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
	637
77d0910d	638	if (ctx->cert->sig->auth_ids[1])
b92e6570 DH	639	return 0;
b92e6570 DH	640
a4c6e57f	641	kid = asymmetric_key_generate_id(value, vlen, "", 0);
b92e6570 DH	642	if (IS_ERR(kid))
	643	return PTR_ERR(kid);
	644	pr_debug("authkeyid %*phN\n", kid->len, kid->data);
77d0910d	645	ctx->cert->sig->auth_ids[1] = kid;
b92e6570 DH	646	return 0;
	647	}
	648
	649	/*
	650	* Note a directoryName in an AuthorityKeyIdentifier
	651	*/
	652	int x509_akid_note_name(void *context, size_t hdrlen,
	653	unsigned char tag,
	654	const void *value, size_t vlen)
	655	{
	656	struct x509_parse_context *ctx = context;
	657
	658	pr_debug("AKID: name: %*phN\n", (int)vlen, value);
	659
	660	ctx->akid_raw_issuer = value;
	661	ctx->akid_raw_issuer_size = vlen;
	662	return 0;
	663	}
	664
	665	/*
	666	* Note a serial number in an AuthorityKeyIdentifier
	667	*/
	668	int x509_akid_note_serial(void *context, size_t hdrlen,
	669	unsigned char tag,
	670	const void *value, size_t vlen)
	671	{
	672	struct x509_parse_context *ctx = context;
	673	struct asymmetric_key_id *kid;
	674
	675	pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
	676
77d0910d	677	if (!ctx->akid_raw_issuer \|\| ctx->cert->sig->auth_ids[0])
b92e6570 DH	678	return 0;
	679
	680	kid = asymmetric_key_generate_id(value,
	681	vlen,
	682	ctx->akid_raw_issuer,
	683	ctx->akid_raw_issuer_size);
	684	if (IS_ERR(kid))
	685	return PTR_ERR(kid);
	686
	687	pr_debug("authkeyid %*phN\n", kid->len, kid->data);
77d0910d	688	ctx->cert->sig->auth_ids[0] = kid;
b92e6570 DH	689	return 0;
b92e6570 DH	690	}