projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 22d01afb DH |
1 | /* Testing module to load key from trusted PKCS#7 message |
| 2 | * | |
| 3 | * Copyright (C) 2014 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) "PKCS7key: "fmt | |
| 13 | #include <linux/key.h> | |
| 8f3438cc | 14 | #include <linux/err.h> |
| 22d01afb DH |
15 | #include <linux/key-type.h> |
| 16 | #include <crypto/pkcs7.h> | |
| 17 | #include <keys/user-type.h> | |
| 18 | #include <keys/system_keyring.h> | |
| 19 | #include "pkcs7_parser.h" | |
| 20 | ||
| 21 | /* | |
| 1ca72c96 | 22 | * Preparse a PKCS#7 wrapped and validated data blob. |
| 22d01afb | 23 | */ |
| 1ca72c96 | 24 | static int pkcs7_preparse(struct key_preparsed_payload *prep) |
| 22d01afb DH |
25 | { |
| 26 | struct pkcs7_message *pkcs7; | |
| 27 | const void *data, *saved_prep_data; | |
| 28 | size_t datalen, saved_prep_datalen; | |
| 29 | bool trusted; | |
| 30 | int ret; | |
| 31 | ||
| 32 | kenter(""); | |
| 33 | ||
| 34 | saved_prep_data = prep->data; | |
| 35 | saved_prep_datalen = prep->datalen; | |
| 36 | pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen); | |
| 37 | if (IS_ERR(pkcs7)) { | |
| 38 | ret = PTR_ERR(pkcs7); | |
| 39 | goto error; | |
| 40 | } | |
| 41 | ||
| 42 | ret = pkcs7_verify(pkcs7); | |
| 43 | if (ret < 0) | |
| 44 | goto error_free; | |
| 45 | ||
| 46 | ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted); | |
| 47 | if (ret < 0) | |
| 48 | goto error_free; | |
| 49 | if (!trusted) | |
| 50 | pr_warn("PKCS#7 message doesn't chain back to a trusted key\n"); | |
| 51 | ||
| 52 | ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false); | |
| 53 | if (ret < 0) | |
| 54 | goto error_free; | |
| 55 | ||
| 56 | prep->data = data; | |
| 57 | prep->datalen = datalen; | |
| 1ca72c96 | 58 | ret = user_preparse(prep); |
| 22d01afb DH |
59 | prep->data = saved_prep_data; |
| 60 | prep->datalen = saved_prep_datalen; | |
| 61 | ||
| 62 | error_free: | |
| 63 | pkcs7_free_message(pkcs7); | |
| 64 | error: | |
| 65 | kleave(" = %d", ret); | |
| 66 | return ret; | |
| 67 | } | |
| 68 | ||
| 69 | /* | |
| 70 | * user defined keys take an arbitrary string as the description and an | |
| 71 | * arbitrary blob of data as the payload | |
| 72 | */ | |
| 63d2551e | 73 | static struct key_type key_type_pkcs7 = { |
| 22d01afb | 74 | .name = "pkcs7_test", |
| 1ca72c96 DH |
75 | .preparse = pkcs7_preparse, |
| 76 | .free_preparse = user_free_preparse, | |
| 77 | .instantiate = generic_key_instantiate, | |
| 22d01afb DH |
78 | .revoke = user_revoke, |
| 79 | .destroy = user_destroy, | |
| 80 | .describe = user_describe, | |
| 81 | .read = user_read, | |
| 82 | }; | |
| 83 | ||
| 84 | /* | |
| 85 | * Module stuff | |
| 86 | */ | |
| 87 | static int __init pkcs7_key_init(void) | |
| 88 | { | |
| 89 | return register_key_type(&key_type_pkcs7); | |
| 90 | } | |
| 91 | ||
| 92 | static void __exit pkcs7_key_cleanup(void) | |
| 93 | { | |
| 94 | unregister_key_type(&key_type_pkcs7); | |
| 95 | } | |
| 96 | ||
| 97 | module_init(pkcs7_key_init); | |
| 98 | module_exit(pkcs7_key_cleanup); |