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305 lines
7.4 KiB
305 lines
7.4 KiB
2 years ago
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* Instantiate a public key crypto key from an X.509 Certificate
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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//#define pr_fmt(fmt) "X.509: "fmt
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//#include <linux/module.h>
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//#include <linux/kernel.h>
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//#include <linux/slab.h>
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//#include <keys/asymmetric-subtype.h>
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//#include <keys/asymmetric-parser.h>
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//#include <keys/system_keyring.h>
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//#include <crypto/hash.h>
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//#include "asymmetric_keys.h"
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//#include "x509_parser.h"
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#include "x509_parser.h"
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#include "errno.h"
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#include "config.h"
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#include "../rewrite/Lib.SoulExtraction.rewrite.h"
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//
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// macro
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//
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/*
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* Set up the signature parameters in an X.509 certificate. This involves
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* digesting the signed data and extracting the signature.
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*/
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// int x509_get_sig_params(struct x509_certificate *cert)
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//{
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// struct public_key_signature *sig = cert->sig;
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// struct crypto_shash *tfm;
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// struct shash_desc *desc;
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// size_t desc_size;
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// int ret;
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//
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// pr_devel("==>%s()\n", __func__);
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//
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// if (!cert->pub->pkey_algo)
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// cert->unsupported_key = true;
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//
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// if (!sig->pkey_algo)
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// cert->unsupported_sig = true;
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//
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// /* We check the hash if we can - even if we can't then verify it */
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// if (!sig->hash_algo) {
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// cert->unsupported_sig = true;
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// return 0;
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// }
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//
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// sig->s = kmemdup(cert->raw_sig, cert->raw_sig_size, GFP_KERNEL);
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// if (!sig->s)
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// return -ENOMEM;
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//
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// sig->s_size = cert->raw_sig_size;
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//
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// /* Allocate the hashing algorithm we're going to need and find out how
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// * big the hash operational data will be.
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// */
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// tfm = crypto_alloc_shash(sig->hash_algo, 0, 0);
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// if (IS_ERR(tfm)) {
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// if (PTR_ERR(tfm) == -ENOENT) {
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// cert->unsupported_sig = true;
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// return 0;
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// }
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// return PTR_ERR(tfm);
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// }
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//
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// desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
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// sig->digest_size = crypto_shash_digestsize(tfm);
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//
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// ret = -ENOMEM;
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// sig->digest = kmalloc(sig->digest_size, GFP_KERNEL);
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// if (!sig->digest)
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// goto error;
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//
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// desc = kzalloc(desc_size, GFP_KERNEL);
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// if (!desc)
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// goto error;
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//
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// desc->tfm = tfm;
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//
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// ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size, sig->digest);
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// if (ret < 0)
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// goto error_2;
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//
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// ret = is_hash_blacklisted(sig->digest, sig->digest_size, "tbs");
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// if (ret == -EKEYREJECTED) {
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// pr_err("Cert %p is blacklisted\n",
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// sig->digest_size, sig->digest);
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// cert->blacklisted = true;
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// ret = 0;
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// }
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//
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// error_2:
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// kfree(desc);
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// error:
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// crypto_free_shash(tfm);
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// pr_devel("<==%s() = %d\n", __func__, ret);
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// return ret;
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// }
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/*
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* Check for self-signedness in an X.509 cert and if found, check the signature
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* immediately if we can.
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*/
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int
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x509_check_for_self_signed(struct x509_certificate *cert)
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{
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int ret = 0;
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pr_devel("==>%s()\n", __func__);
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pr_devel("raw_subject_size=%d,raw_issuer_size=%d\n", cert->raw_subject_size, cert->raw_issuer_size);
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/*if (cert->raw_subject_size != cert->raw_issuer_size ||
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memcmp(cert->raw_subject, cert->raw_issuer,
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cert->raw_issuer_size) != 0)
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{
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goto not_self_signed;
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}*/
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if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1])
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{
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/* If the AKID is present it may have one or two parts. If
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* both are supplied, both must match.
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*/
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unsigned char a = asymmetric_key_id_same(cert->skid, cert->sig->auth_ids[1]);
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unsigned char b = asymmetric_key_id_same(cert->id, cert->sig->auth_ids[0]);
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pr_devel(
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"skid=%p,auth_ids[1]=%p,id=%p,auth_ids[0]=%p,a=%d,b=%d\n",
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cert->skid,
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cert->sig->auth_ids[1],
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cert->id,
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cert->sig->auth_ids[0],
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a,
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b);
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if (!a && !b)
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{
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pr_devel("232323232323\n");
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goto not_self_signed;
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}
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ret = -EKEYREJECTED;
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if (((a && !b) || (b && !a)) && cert->sig->auth_ids[0] && cert->sig->auth_ids[1])
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{
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pr_devel("3.3333\n");
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goto out;
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}
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}
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ret = -EKEYREJECTED;
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if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0)
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{
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pr_devel("3.444\n");
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goto out;
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}
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/*ret = public_key_verify_signature(cert->pub, cert->sig);
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if (ret < 0) {
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if (ret == -ENOPKG) {
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cert->unsupported_sig = TRUE;
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ret = 0;
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}
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goto out;
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}*/
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pr_devel("Cert Self-signature verified");
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cert->self_signed = TRUE;
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out:
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pr_devel("<==%s() = %d\n", __func__, ret);
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return ret;
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not_self_signed:
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pr_devel("<==%s() = 0 [not]\n", __func__);
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return 0;
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}
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/*
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* Attempt to parse a data blob for a key as an X509 certificate.
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*/
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// static int x509_key_preparse(struct key_preparsed_payload *prep)
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//{
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// struct asymmetric_key_ids *kids;
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// struct x509_certificate *cert;
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// const char *q;
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// size_t srlen, sulen;
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// char *desc = NULL, *p;
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// int ret;
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//
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// cert = x509_cert_parse(prep->data, prep->datalen);
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// if (IS_ERR(cert))
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// return PTR_ERR(cert);
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//
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// pr_devel("Cert Issuer: %s\n", cert->issuer);
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// pr_devel("Cert Subject: %s\n", cert->subject);
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//
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// if (cert->unsupported_key) {
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// ret = -ENOPKG;
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// goto error_free_cert;
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// }
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//
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// pr_devel("Cert Key Algo: %s\n", cert->pub->pkey_algo);
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// pr_devel("Cert Valid period: %lld-%lld\n", cert->valid_from, cert->valid_to);
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//
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// cert->pub->id_type = "X509";
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//
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// if (cert->unsupported_sig) {
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// public_key_signature_free(cert->sig);
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// cert->sig = NULL;
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// } else {
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// pr_devel("Cert Signature: %s + %s\n",
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// cert->sig->pkey_algo, cert->sig->hash_algo);
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// }
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//
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// /* Don't permit addition of blacklisted keys */
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// ret = -EKEYREJECTED;
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// if (cert->blacklisted)
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// goto error_free_cert;
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//
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// /* Propose a description */
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// sulen = strlen(cert->subject);
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// if (cert->raw_skid) {
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// srlen = cert->raw_skid_size;
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// q = cert->raw_skid;
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// } else {
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// srlen = cert->raw_serial_size;
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// q = cert->raw_serial;
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// }
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//
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// ret = -ENOMEM;
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// desc = kmalloc(sulen + 2 + srlen * 2 + 1, GFP_KERNEL);
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// if (!desc)
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// goto error_free_cert;
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// p = memcpy(desc, cert->subject, sulen);
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// p += sulen;
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// *p++ = ':';
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// *p++ = ' ';
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// p = bin2hex(p, q, srlen);
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// *p = 0;
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//
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// kids = kmalloc(sizeof(struct asymmetric_key_ids), GFP_KERNEL);
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// if (!kids)
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// goto error_free_desc;
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// kids->id[0] = cert->id;
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// kids->id[1] = cert->skid;
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//
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// /* We're pinning the module by being linked against it */
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// __module_get(public_key_subtype.owner);
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// prep->payload.data[asym_subtype] = &public_key_subtype;
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// prep->payload.data[asym_key_ids] = kids;
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// prep->payload.data[asym_crypto] = cert->pub;
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// prep->payload.data[asym_auth] = cert->sig;
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// prep->description = desc;
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// prep->quotalen = 100;
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//
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// /* We've finished with the certificate */
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// cert->pub = NULL;
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// cert->id = NULL;
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// cert->skid = NULL;
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// cert->sig = NULL;
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// desc = NULL;
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// ret = 0;
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//
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// error_free_desc:
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// kfree(desc);
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// error_free_cert:
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// x509_free_certificate(cert);
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// return ret;
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// }
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// static struct asymmetric_key_parser x509_key_parser = {
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// .owner = THIS_MODULE,
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// .name = "x509",
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// .parse = x509_key_preparse,
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// };
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/*
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* Module stuff
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*/
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// static int __init x509_key_init(void)
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//{
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// return register_asymmetric_key_parser(&x509_key_parser);
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// }
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//
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// static void __exit x509_key_exit(void)
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//{
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// unregister_asymmetric_key_parser(&x509_key_parser);
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// }
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//
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// module_init(x509_key_init);
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// module_exit(x509_key_exit);
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//
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// MODULE_DESCRIPTION("X.509 certificate parser");
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// MODULE_AUTHOR("Red Hat, Inc.");
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// MODULE_LICENSE("GPL");
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