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636 lines
17 KiB
636 lines
17 KiB
/* Asymmetric public-key cryptography key type
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*
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* See Documentation/security/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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* 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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//#include <keys/asymmetric-subtype.h>
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//#include <keys/asymmetric-parser.h>
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//#include <crypto/public_key.h>
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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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//#include <keys/system_keyring.h>
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//#include "asymmetric_keys.h"
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//
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// MODULE_LICENSE("GPL");
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#include "asymmetric-type.h"
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#include "errno.h"
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#include "../rewrite/Lib.SoulExtraction.rewrite.h"
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#include "config.h"
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#define GFP_ATOMIC /*(__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)*/ 1
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#define GFP_KERNEL /*(__GFP_RECLAIM | __GFP_IO | __GFP_FS)*/ 2
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#define GFP_KERNEL_ACCOUNT /*(GFP_KERNEL | __GFP_ACCOUNT)*/ 3
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#define GFP_NOWAIT /*(__GFP_KSWAPD_RECLAIM)*/ 4
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#define GFP_NOIO /*(__GFP_RECLAIM)*/ 5
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#define GFP_NOFS /*(__GFP_RECLAIM | __GFP_IO)*/ 6
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#define GFP_USER /*(__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL)*/ 7
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#define GFP_DMA /*__GFP_DMA*/ 8
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#define GFP_DMA32 /*__GFP_DMA32*/ 9
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#define GFP_HIGHUSER /*(GFP_USER | __GFP_HIGHMEM)*/ 10
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#define GFP_HIGHUSER_MOVABLE /*(GFP_HIGHUSER | __GFP_MOVABLE)*/ 11
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#define GFP_TRANSHUGE_LIGHT 12
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#define GFP_TRANSHUGE /*(GFP_TRANSHUGE_LIGHT | __GFP_DIRECT_RECLAIM)*/ 13
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#define ERR_PTR(err) ((void *)((long)(err)))
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#define PTR_ERR(ptr) ((long)(ptr))
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#define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
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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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//
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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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//
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// BUG_ON(!id_0 && !id_1);
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//
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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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//
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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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//
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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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//
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// pr_debug("Look up: \"%s\"\n", req);
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//
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// ref = keyring_search(make_key_ref(keyring, 1),
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// &key_type_asymmetric, req);
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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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//
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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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//
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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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//
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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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//
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// pr_devel("<==%s() = 0 [%x]\n", __func__, key_serial(key));
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// return key;
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//
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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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/**
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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 *
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asymmetric_key_generate_id(const void *val_1, size_t len_1, const void *val_2, 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, 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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unsigned char
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asymmetric_key_id_same(const struct asymmetric_key_id *kid1, 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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/**
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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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//
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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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//
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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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//
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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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//
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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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//
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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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//
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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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//
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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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//
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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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//
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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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//
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// seq_puts(m, key->description);
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//
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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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//
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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, "%p", n, p);
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// }
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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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//
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// pr_devel("==>%s()\n", __func__);
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//
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// if (prep->datalen == 0)
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// return -EINVAL;
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//
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// down_read(&asymmetric_key_parsers_sem);
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//
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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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//
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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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//
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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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//
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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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//
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// pr_devel("==>%s()\n", __func__);
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//
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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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//
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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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//
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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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//
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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)
|
|
//{
|
|
// struct key_restriction *keyres =
|
|
// kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
|
|
//
|
|
// if (!keyres)
|
|
// return ERR_PTR(-ENOMEM);
|
|
//
|
|
// keyres->check = check;
|
|
// keyres->key = key;
|
|
// keyres->keytype = &key_type_asymmetric;
|
|
//
|
|
// return keyres;
|
|
// }
|
|
|
|
/*
|
|
* look up keyring restrict functions for asymmetric keys
|
|
*/
|
|
// static struct key_restriction *asymmetric_lookup_restriction(
|
|
// const char *restriction)
|
|
//{
|
|
// char *restrict_method;
|
|
// char *parse_buf;
|
|
// char *next;
|
|
// struct key_restriction *ret = ERR_PTR(-EINVAL);
|
|
//
|
|
// if (strcmp("builtin_trusted", restriction) == 0)
|
|
// return asymmetric_restriction_alloc(
|
|
// restrict_link_by_builtin_trusted, NULL);
|
|
//
|
|
// if (strcmp("builtin_and_secondary_trusted", restriction) == 0)
|
|
// return asymmetric_restriction_alloc(
|
|
// restrict_link_by_builtin_and_secondary_trusted, NULL);
|
|
//
|
|
// parse_buf = kstrndup(restriction, PAGE_SIZE, GFP_KERNEL);
|
|
// if (!parse_buf)
|
|
// return ERR_PTR(-ENOMEM);
|
|
//
|
|
// next = parse_buf;
|
|
// restrict_method = strsep(&next, ":");
|
|
//
|
|
// if ((strcmp(restrict_method, "key_or_keyring") == 0) && next) {
|
|
// char *key_text;
|
|
// key_serial_t serial;
|
|
// struct key *key;
|
|
// 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;
|
|
// }
|
|
|
|
// 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,
|
|
// };
|
|
// 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);
|