98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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/* Testing module to load key from trusted PKCS#7 message
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*
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* Copyright (C) 2014 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "PKCS7key: "fmt
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#include <linux/key.h>
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#include <linux/key-type.h>
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#include <crypto/pkcs7.h>
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#include <keys/user-type.h>
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#include <keys/system_keyring.h>
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#include "pkcs7_parser.h"
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/*
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* Instantiate a PKCS#7 wrapped and validated key.
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*/
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int pkcs7_instantiate(struct key *key, struct key_preparsed_payload *prep)
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{
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struct pkcs7_message *pkcs7;
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const void *data, *saved_prep_data;
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size_t datalen, saved_prep_datalen;
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bool trusted;
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int ret;
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kenter("");
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saved_prep_data = prep->data;
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saved_prep_datalen = prep->datalen;
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pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen);
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if (IS_ERR(pkcs7)) {
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ret = PTR_ERR(pkcs7);
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goto error;
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}
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ret = pkcs7_verify(pkcs7);
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if (ret < 0)
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goto error_free;
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ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted);
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if (ret < 0)
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goto error_free;
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if (!trusted)
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pr_warn("PKCS#7 message doesn't chain back to a trusted key\n");
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ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false);
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if (ret < 0)
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goto error_free;
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prep->data = data;
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prep->datalen = datalen;
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ret = user_instantiate(key, prep);
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prep->data = saved_prep_data;
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prep->datalen = saved_prep_datalen;
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error_free:
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pkcs7_free_message(pkcs7);
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error:
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kleave(" = %d", ret);
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return ret;
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}
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/*
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* user defined keys take an arbitrary string as the description and an
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* arbitrary blob of data as the payload
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*/
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struct key_type key_type_pkcs7 = {
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.name = "pkcs7_test",
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.def_lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
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.instantiate = pkcs7_instantiate,
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.match = user_match,
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.revoke = user_revoke,
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.destroy = user_destroy,
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.describe = user_describe,
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.read = user_read,
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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 pkcs7_key_init(void)
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{
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return register_key_type(&key_type_pkcs7);
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}
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static void __exit pkcs7_key_cleanup(void)
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{
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unregister_key_type(&key_type_pkcs7);
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}
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module_init(pkcs7_key_init);
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module_exit(pkcs7_key_cleanup);
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