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![Simon Glass](/assets/img/avatar_default.png)
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
673 lines
16 KiB
C
673 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Asymmetric public-key cryptography key type
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*
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* See Documentation/crypto/asymmetric-keys.txt
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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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#ifndef __UBOOT__
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#include <log.h>
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#include <dm/devres.h>
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#include <keys/asymmetric-subtype.h>
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#include <keys/asymmetric-parser.h>
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#endif
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#include <crypto/public_key.h>
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#ifdef __UBOOT__
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#include <linux/bug.h>
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#include <linux/compat.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#else
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#endif
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#ifdef __UBOOT__
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#include <keys/asymmetric-type.h>
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#else
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#include <keys/system_keyring.h>
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#include <keys/user-type.h>
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#include "asymmetric_keys.h"
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#endif
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MODULE_LICENSE("GPL");
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#ifndef __UBOOT__
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const char *const key_being_used_for[NR__KEY_BEING_USED_FOR] = {
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[VERIFYING_MODULE_SIGNATURE] = "mod sig",
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[VERIFYING_FIRMWARE_SIGNATURE] = "firmware sig",
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[VERIFYING_KEXEC_PE_SIGNATURE] = "kexec PE sig",
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[VERIFYING_KEY_SIGNATURE] = "key sig",
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[VERIFYING_KEY_SELF_SIGNATURE] = "key self sig",
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[VERIFYING_UNSPECIFIED_SIGNATURE] = "unspec sig",
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};
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EXPORT_SYMBOL_GPL(key_being_used_for);
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static LIST_HEAD(asymmetric_key_parsers);
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static DECLARE_RWSEM(asymmetric_key_parsers_sem);
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/**
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* find_asymmetric_key - Find a key by ID.
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* @keyring: The keys to search.
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* @id_0: The first ID to look for or NULL.
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* @id_1: The second ID to look for or NULL.
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* @partial: Use partial match if true, exact if false.
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*
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* Find a key in the given keyring by identifier. The preferred identifier is
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* the id_0 and the fallback identifier is the id_1. If both are given, the
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* lookup is by the former, but the latter must also match.
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*/
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struct key *find_asymmetric_key(struct key *keyring,
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const struct asymmetric_key_id *id_0,
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const struct asymmetric_key_id *id_1,
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bool partial)
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{
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struct key *key;
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key_ref_t ref;
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const char *lookup;
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char *req, *p;
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int len;
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BUG_ON(!id_0 && !id_1);
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if (id_0) {
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lookup = id_0->data;
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len = id_0->len;
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} else {
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lookup = id_1->data;
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len = id_1->len;
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}
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/* Construct an identifier "id:<keyid>". */
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p = req = kmalloc(2 + 1 + len * 2 + 1, GFP_KERNEL);
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if (!req)
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return ERR_PTR(-ENOMEM);
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if (partial) {
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*p++ = 'i';
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*p++ = 'd';
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} else {
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*p++ = 'e';
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*p++ = 'x';
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}
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*p++ = ':';
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p = bin2hex(p, lookup, len);
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*p = 0;
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pr_debug("Look up: \"%s\"\n", req);
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ref = keyring_search(make_key_ref(keyring, 1),
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&key_type_asymmetric, req, true);
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if (IS_ERR(ref))
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pr_debug("Request for key '%s' err %ld\n", req, PTR_ERR(ref));
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kfree(req);
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if (IS_ERR(ref)) {
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switch (PTR_ERR(ref)) {
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/* Hide some search errors */
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case -EACCES:
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case -ENOTDIR:
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case -EAGAIN:
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return ERR_PTR(-ENOKEY);
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default:
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return ERR_CAST(ref);
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}
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}
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key = key_ref_to_ptr(ref);
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if (id_0 && id_1) {
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const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
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if (!kids->id[1]) {
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pr_debug("First ID matches, but second is missing\n");
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goto reject;
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}
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if (!asymmetric_key_id_same(id_1, kids->id[1])) {
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pr_debug("First ID matches, but second does not\n");
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goto reject;
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}
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}
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pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key));
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return key;
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reject:
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key_put(key);
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return ERR_PTR(-EKEYREJECTED);
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}
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EXPORT_SYMBOL_GPL(find_asymmetric_key);
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#endif /* !__UBOOT__ */
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/**
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* asymmetric_key_generate_id: Construct an asymmetric key ID
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* @val_1: First binary blob
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* @len_1: Length of first binary blob
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* @val_2: Second binary blob
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* @len_2: Length of second binary blob
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*
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* Construct an asymmetric key ID from a pair of binary blobs.
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*/
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struct asymmetric_key_id *asymmetric_key_generate_id(const void *val_1,
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size_t len_1,
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const void *val_2,
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size_t len_2)
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{
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struct asymmetric_key_id *kid;
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kid = kmalloc(sizeof(struct asymmetric_key_id) + len_1 + len_2,
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GFP_KERNEL);
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if (!kid)
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return ERR_PTR(-ENOMEM);
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kid->len = len_1 + len_2;
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memcpy(kid->data, val_1, len_1);
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memcpy(kid->data + len_1, val_2, len_2);
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return kid;
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}
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EXPORT_SYMBOL_GPL(asymmetric_key_generate_id);
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/**
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* asymmetric_key_id_same - Return true if two asymmetric keys IDs are the same.
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* @kid_1, @kid_2: The key IDs to compare
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*/
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bool asymmetric_key_id_same(const struct asymmetric_key_id *kid1,
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const struct asymmetric_key_id *kid2)
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{
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if (!kid1 || !kid2)
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return false;
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if (kid1->len != kid2->len)
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return false;
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return memcmp(kid1->data, kid2->data, kid1->len) == 0;
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}
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EXPORT_SYMBOL_GPL(asymmetric_key_id_same);
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/**
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* asymmetric_key_id_partial - Return true if two asymmetric keys IDs
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* partially match
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* @kid_1, @kid_2: The key IDs to compare
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*/
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bool asymmetric_key_id_partial(const struct asymmetric_key_id *kid1,
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const struct asymmetric_key_id *kid2)
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{
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if (!kid1 || !kid2)
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return false;
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if (kid1->len < kid2->len)
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return false;
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return memcmp(kid1->data + (kid1->len - kid2->len),
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kid2->data, kid2->len) == 0;
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}
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EXPORT_SYMBOL_GPL(asymmetric_key_id_partial);
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#ifndef __UBOOT__
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/**
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* asymmetric_match_key_ids - Search asymmetric key IDs
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* @kids: The list of key IDs to check
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* @match_id: The key ID we're looking for
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* @match: The match function to use
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*/
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static bool asymmetric_match_key_ids(
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const struct asymmetric_key_ids *kids,
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const struct asymmetric_key_id *match_id,
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bool (*match)(const struct asymmetric_key_id *kid1,
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const struct asymmetric_key_id *kid2))
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{
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int i;
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if (!kids || !match_id)
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return false;
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for (i = 0; i < ARRAY_SIZE(kids->id); i++)
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if (match(kids->id[i], match_id))
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return true;
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return false;
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}
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/* helper function can be called directly with pre-allocated memory */
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inline int __asymmetric_key_hex_to_key_id(const char *id,
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struct asymmetric_key_id *match_id,
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size_t hexlen)
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{
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match_id->len = hexlen;
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return hex2bin(match_id->data, id, hexlen);
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}
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/**
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* asymmetric_key_hex_to_key_id - Convert a hex string into a key ID.
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* @id: The ID as a hex string.
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*/
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struct asymmetric_key_id *asymmetric_key_hex_to_key_id(const char *id)
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{
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struct asymmetric_key_id *match_id;
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size_t asciihexlen;
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int ret;
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if (!*id)
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return ERR_PTR(-EINVAL);
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asciihexlen = strlen(id);
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if (asciihexlen & 1)
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return ERR_PTR(-EINVAL);
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match_id = kmalloc(sizeof(struct asymmetric_key_id) + asciihexlen / 2,
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GFP_KERNEL);
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if (!match_id)
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return ERR_PTR(-ENOMEM);
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ret = __asymmetric_key_hex_to_key_id(id, match_id, asciihexlen / 2);
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if (ret < 0) {
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kfree(match_id);
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return ERR_PTR(-EINVAL);
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}
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return match_id;
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}
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/*
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* Match asymmetric keys by an exact match on an ID.
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*/
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static bool asymmetric_key_cmp(const struct key *key,
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const struct key_match_data *match_data)
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{
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const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
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const struct asymmetric_key_id *match_id = match_data->preparsed;
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return asymmetric_match_key_ids(kids, match_id,
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asymmetric_key_id_same);
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}
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/*
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* Match asymmetric keys by a partial match on an IDs.
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*/
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static bool asymmetric_key_cmp_partial(const struct key *key,
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const struct key_match_data *match_data)
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{
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const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
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const struct asymmetric_key_id *match_id = match_data->preparsed;
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return asymmetric_match_key_ids(kids, match_id,
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asymmetric_key_id_partial);
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}
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/*
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* Preparse the match criterion. If we don't set lookup_type and cmp,
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* the default will be an exact match on the key description.
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*
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* There are some specifiers for matching key IDs rather than by the key
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* description:
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*
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* "id:<id>" - find a key by partial match on any available ID
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* "ex:<id>" - find a key by exact match on any available ID
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*
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* These have to be searched by iteration rather than by direct lookup because
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* the key is hashed according to its description.
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*/
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static int asymmetric_key_match_preparse(struct key_match_data *match_data)
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{
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struct asymmetric_key_id *match_id;
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const char *spec = match_data->raw_data;
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const char *id;
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bool (*cmp)(const struct key *, const struct key_match_data *) =
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asymmetric_key_cmp;
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if (!spec || !*spec)
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return -EINVAL;
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if (spec[0] == 'i' &&
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spec[1] == 'd' &&
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spec[2] == ':') {
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id = spec + 3;
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cmp = asymmetric_key_cmp_partial;
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} else if (spec[0] == 'e' &&
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spec[1] == 'x' &&
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spec[2] == ':') {
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id = spec + 3;
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} else {
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goto default_match;
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}
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match_id = asymmetric_key_hex_to_key_id(id);
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if (IS_ERR(match_id))
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return PTR_ERR(match_id);
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match_data->preparsed = match_id;
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match_data->cmp = cmp;
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match_data->lookup_type = KEYRING_SEARCH_LOOKUP_ITERATE;
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return 0;
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default_match:
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return 0;
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}
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/*
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* Free the preparsed the match criterion.
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*/
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static void asymmetric_key_match_free(struct key_match_data *match_data)
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{
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kfree(match_data->preparsed);
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}
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/*
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* Describe the asymmetric key
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*/
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static void asymmetric_key_describe(const struct key *key, struct seq_file *m)
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{
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const struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
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const struct asymmetric_key_ids *kids = asymmetric_key_ids(key);
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const struct asymmetric_key_id *kid;
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const unsigned char *p;
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int n;
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seq_puts(m, key->description);
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if (subtype) {
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seq_puts(m, ": ");
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subtype->describe(key, m);
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if (kids && kids->id[1]) {
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kid = kids->id[1];
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seq_putc(m, ' ');
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n = kid->len;
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p = kid->data;
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if (n > 4) {
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p += n - 4;
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n = 4;
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}
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seq_printf(m, "%*phN", n, p);
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}
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seq_puts(m, " [");
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/* put something here to indicate the key's capabilities */
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seq_putc(m, ']');
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}
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}
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/*
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* Preparse a asymmetric payload to get format the contents appropriately for the
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* internal payload to cut down on the number of scans of the data performed.
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*
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* We also generate a proposed description from the contents of the key that
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* can be used to name the key if the user doesn't want to provide one.
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*/
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static int asymmetric_key_preparse(struct key_preparsed_payload *prep)
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{
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struct asymmetric_key_parser *parser;
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int ret;
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pr_devel("==>%s()\n", __func__);
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if (prep->datalen == 0)
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return -EINVAL;
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down_read(&asymmetric_key_parsers_sem);
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ret = -EBADMSG;
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list_for_each_entry(parser, &asymmetric_key_parsers, link) {
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pr_debug("Trying parser '%s'\n", parser->name);
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ret = parser->parse(prep);
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if (ret != -EBADMSG) {
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pr_debug("Parser recognised the format (ret %d)\n",
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ret);
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break;
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}
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}
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up_read(&asymmetric_key_parsers_sem);
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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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* Clean up the key ID list
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*/
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static void asymmetric_key_free_kids(struct asymmetric_key_ids *kids)
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{
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int i;
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if (kids) {
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for (i = 0; i < ARRAY_SIZE(kids->id); i++)
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kfree(kids->id[i]);
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kfree(kids);
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}
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}
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/*
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* Clean up the preparse data
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*/
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static void asymmetric_key_free_preparse(struct key_preparsed_payload *prep)
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{
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struct asymmetric_key_subtype *subtype = prep->payload.data[asym_subtype];
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struct asymmetric_key_ids *kids = prep->payload.data[asym_key_ids];
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pr_devel("==>%s()\n", __func__);
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if (subtype) {
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subtype->destroy(prep->payload.data[asym_crypto],
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prep->payload.data[asym_auth]);
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module_put(subtype->owner);
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}
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asymmetric_key_free_kids(kids);
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kfree(prep->description);
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}
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/*
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* dispose of the data dangling from the corpse of a asymmetric key
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*/
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static void asymmetric_key_destroy(struct key *key)
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{
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struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
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struct asymmetric_key_ids *kids = key->payload.data[asym_key_ids];
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void *data = key->payload.data[asym_crypto];
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void *auth = key->payload.data[asym_auth];
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key->payload.data[asym_crypto] = NULL;
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key->payload.data[asym_subtype] = NULL;
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key->payload.data[asym_key_ids] = NULL;
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key->payload.data[asym_auth] = NULL;
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if (subtype) {
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subtype->destroy(data, auth);
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module_put(subtype->owner);
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}
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asymmetric_key_free_kids(kids);
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}
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static struct key_restriction *asymmetric_restriction_alloc(
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key_restrict_link_func_t check,
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struct key *key)
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{
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struct key_restriction *keyres =
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kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
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if (!keyres)
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return ERR_PTR(-ENOMEM);
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keyres->check = check;
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keyres->key = key;
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keyres->keytype = &key_type_asymmetric;
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return keyres;
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}
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/*
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* look up keyring restrict functions for asymmetric keys
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*/
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static struct key_restriction *asymmetric_lookup_restriction(
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const char *restriction)
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{
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char *restrict_method;
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char *parse_buf;
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char *next;
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struct key_restriction *ret = ERR_PTR(-EINVAL);
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if (strcmp("builtin_trusted", restriction) == 0)
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return asymmetric_restriction_alloc(
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restrict_link_by_builtin_trusted, NULL);
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if (strcmp("builtin_and_secondary_trusted", restriction) == 0)
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return asymmetric_restriction_alloc(
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restrict_link_by_builtin_and_secondary_trusted, NULL);
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parse_buf = kstrndup(restriction, PAGE_SIZE, GFP_KERNEL);
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if (!parse_buf)
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return ERR_PTR(-ENOMEM);
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next = parse_buf;
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restrict_method = strsep(&next, ":");
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if ((strcmp(restrict_method, "key_or_keyring") == 0) && next) {
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char *key_text;
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key_serial_t serial;
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struct key *key;
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key_restrict_link_func_t link_fn =
|
|
restrict_link_by_key_or_keyring;
|
|
bool allow_null_key = false;
|
|
|
|
key_text = strsep(&next, ":");
|
|
|
|
if (next) {
|
|
if (strcmp(next, "chain") != 0)
|
|
goto out;
|
|
|
|
link_fn = restrict_link_by_key_or_keyring_chain;
|
|
allow_null_key = true;
|
|
}
|
|
|
|
if (kstrtos32(key_text, 0, &serial) < 0)
|
|
goto out;
|
|
|
|
if ((serial == 0) && allow_null_key) {
|
|
key = NULL;
|
|
} else {
|
|
key = key_lookup(serial);
|
|
if (IS_ERR(key)) {
|
|
ret = ERR_CAST(key);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = asymmetric_restriction_alloc(link_fn, key);
|
|
if (IS_ERR(ret))
|
|
key_put(key);
|
|
}
|
|
|
|
out:
|
|
kfree(parse_buf);
|
|
return ret;
|
|
}
|
|
|
|
int asymmetric_key_eds_op(struct kernel_pkey_params *params,
|
|
const void *in, void *out)
|
|
{
|
|
const struct asymmetric_key_subtype *subtype;
|
|
struct key *key = params->key;
|
|
int ret;
|
|
|
|
pr_devel("==>%s()\n", __func__);
|
|
|
|
if (key->type != &key_type_asymmetric)
|
|
return -EINVAL;
|
|
subtype = asymmetric_key_subtype(key);
|
|
if (!subtype ||
|
|
!key->payload.data[0])
|
|
return -EINVAL;
|
|
if (!subtype->eds_op)
|
|
return -ENOTSUPP;
|
|
|
|
ret = subtype->eds_op(params, in, out);
|
|
|
|
pr_devel("<==%s() = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int asymmetric_key_verify_signature(struct kernel_pkey_params *params,
|
|
const void *in, const void *in2)
|
|
{
|
|
struct public_key_signature sig = {
|
|
.s_size = params->in2_len,
|
|
.digest_size = params->in_len,
|
|
.encoding = params->encoding,
|
|
.hash_algo = params->hash_algo,
|
|
.digest = (void *)in,
|
|
.s = (void *)in2,
|
|
};
|
|
|
|
return verify_signature(params->key, &sig);
|
|
}
|
|
|
|
struct key_type key_type_asymmetric = {
|
|
.name = "asymmetric",
|
|
.preparse = asymmetric_key_preparse,
|
|
.free_preparse = asymmetric_key_free_preparse,
|
|
.instantiate = generic_key_instantiate,
|
|
.match_preparse = asymmetric_key_match_preparse,
|
|
.match_free = asymmetric_key_match_free,
|
|
.destroy = asymmetric_key_destroy,
|
|
.describe = asymmetric_key_describe,
|
|
.lookup_restriction = asymmetric_lookup_restriction,
|
|
.asym_query = query_asymmetric_key,
|
|
.asym_eds_op = asymmetric_key_eds_op,
|
|
.asym_verify_signature = asymmetric_key_verify_signature,
|
|
};
|
|
EXPORT_SYMBOL_GPL(key_type_asymmetric);
|
|
|
|
/**
|
|
* register_asymmetric_key_parser - Register a asymmetric key blob parser
|
|
* @parser: The parser to register
|
|
*/
|
|
int register_asymmetric_key_parser(struct asymmetric_key_parser *parser)
|
|
{
|
|
struct asymmetric_key_parser *cursor;
|
|
int ret;
|
|
|
|
down_write(&asymmetric_key_parsers_sem);
|
|
|
|
list_for_each_entry(cursor, &asymmetric_key_parsers, link) {
|
|
if (strcmp(cursor->name, parser->name) == 0) {
|
|
pr_err("Asymmetric key parser '%s' already registered\n",
|
|
parser->name);
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&parser->link, &asymmetric_key_parsers);
|
|
|
|
pr_notice("Asymmetric key parser '%s' registered\n", parser->name);
|
|
ret = 0;
|
|
|
|
out:
|
|
up_write(&asymmetric_key_parsers_sem);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_asymmetric_key_parser);
|
|
|
|
/**
|
|
* unregister_asymmetric_key_parser - Unregister a asymmetric key blob parser
|
|
* @parser: The parser to unregister
|
|
*/
|
|
void unregister_asymmetric_key_parser(struct asymmetric_key_parser *parser)
|
|
{
|
|
down_write(&asymmetric_key_parsers_sem);
|
|
list_del(&parser->link);
|
|
up_write(&asymmetric_key_parsers_sem);
|
|
|
|
pr_notice("Asymmetric key parser '%s' unregistered\n", parser->name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_asymmetric_key_parser);
|
|
|
|
/*
|
|
* Module stuff
|
|
*/
|
|
static int __init asymmetric_key_init(void)
|
|
{
|
|
return register_key_type(&key_type_asymmetric);
|
|
}
|
|
|
|
static void __exit asymmetric_key_cleanup(void)
|
|
{
|
|
unregister_key_type(&key_type_asymmetric);
|
|
}
|
|
|
|
module_init(asymmetric_key_init);
|
|
module_exit(asymmetric_key_cleanup);
|
|
#endif /* !__UBOOT__ */
|