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> | |
| 14 | #include <linux/key-type.h> | |
| 15 | #include <crypto/pkcs7.h> | |
| 16 | #include <keys/user-type.h> | |
| 17 | #include <keys/system_keyring.h> | |
| 18 | #include "pkcs7_parser.h" | |
| 19 | ||
| 20 | /* | |
| 21 | * Instantiate a PKCS#7 wrapped and validated key. | |
| 22 | */ | |
| 23 | int pkcs7_instantiate(struct key *key, struct key_preparsed_payload *prep) | |
| 24 | { | |
| 25 | struct pkcs7_message *pkcs7; | |
| 26 | const void *data, *saved_prep_data; | |
| 27 | size_t datalen, saved_prep_datalen; | |
| 28 | bool trusted; | |
| 29 | int ret; | |
| 30 | ||
| 31 | kenter(""); | |
| 32 | ||
| 33 | saved_prep_data = prep->data; | |
| 34 | saved_prep_datalen = prep->datalen; | |
| 35 | pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen); | |
| 36 | if (IS_ERR(pkcs7)) { | |
| 37 | ret = PTR_ERR(pkcs7); | |
| 38 | goto error; | |
| 39 | } | |
| 40 | ||
| 41 | ret = pkcs7_verify(pkcs7); | |
| 42 | if (ret < 0) | |
| 43 | goto error_free; | |
| 44 | ||
| 45 | ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted); | |
| 46 | if (ret < 0) | |
| 47 | goto error_free; | |
| 48 | if (!trusted) | |
| 49 | pr_warn("PKCS#7 message doesn't chain back to a trusted key\n"); | |
| 50 | ||
| 51 | ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false); | |
| 52 | if (ret < 0) | |
| 53 | goto error_free; | |
| 54 | ||
| 55 | prep->data = data; | |
| 56 | prep->datalen = datalen; | |
| 57 | ret = user_instantiate(key, prep); | |
| 58 | prep->data = saved_prep_data; | |
| 59 | prep->datalen = saved_prep_datalen; | |
| 60 | ||
| 61 | error_free: | |
| 62 | pkcs7_free_message(pkcs7); | |
| 63 | error: | |
| 64 | kleave(" = %d", ret); | |
| 65 | return ret; | |
| 66 | } | |
| 67 | ||
| 68 | /* | |
| 69 | * user defined keys take an arbitrary string as the description and an | |
| 70 | * arbitrary blob of data as the payload | |
| 71 | */ | |
| 72 | struct key_type key_type_pkcs7 = { | |
| 73 | .name = "pkcs7_test", | |
| 74 | .def_lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, | |
| 75 | .instantiate = pkcs7_instantiate, | |
| 76 | .match = user_match, | |
| 77 | .revoke = user_revoke, | |
| 78 | .destroy = user_destroy, | |
| 79 | .describe = user_describe, | |
| 80 | .read = user_read, | |
| 81 | }; | |
| 82 | ||
| 83 | /* | |
| 84 | * Module stuff | |
| 85 | */ | |
| 86 | static int __init pkcs7_key_init(void) | |
| 87 | { | |
| 88 | return register_key_type(&key_type_pkcs7); | |
| 89 | } | |
| 90 | ||
| 91 | static void __exit pkcs7_key_cleanup(void) | |
| 92 | { | |
| 93 | unregister_key_type(&key_type_pkcs7); | |
| 94 | } | |
| 95 | ||
| 96 | module_init(pkcs7_key_init); | |
| 97 | module_exit(pkcs7_key_cleanup); |