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#include <linux/export.h>
#include <linux/slab.h>
#include <linux/key.h>
#include <linux/err.h>
#include <keys/asymmetric-type.h>
#include "x509_parser.h"
static void keyring_clear(struct key *keyring)
{
struct key *key, *tmp;
if (!keyring->keyring)
return;
list_for_each_entry_safe(key, tmp, &keyring->list, list) {
WARN_ON(refcount_read(&key->refcount) > 1);
key_put(key);
}
}
void key_put(struct key *key)
{
if (refcount_dec_and_test(&key->refcount)) {
keyring_clear(key);
list_del(&key->list);
kfree(key->description);
public_key_free(key->public_key);
public_key_signature_free(key->sig);
kfree(key->kids.id[0]);
kfree(key->kids.id[1]);
kfree(key);
}
}
EXPORT_SYMBOL_GPL(key_put);
static struct key *key_alloc(void)
{
struct key *key = kzalloc(sizeof(*key), GFP_KERNEL);
if (!key)
return NULL;
refcount_set(&key->refcount, 1);
INIT_LIST_HEAD(&key->list);
return key;
}
struct key *bp_keyring_alloc(void)
{
struct key *key = key_alloc();
if (!key)
return NULL;
key->keyring = true;
return key;
}
EXPORT_SYMBOL_GPL(bp_keyring_alloc);
key_ref_t bp_key_create_or_update(key_ref_t keyring,
const char *description,
const void *payload,
size_t plen)
{
struct key *key = key_alloc();
struct x509_certificate *cert;
const char *q;
size_t srlen, sulen;
char *desc = NULL, *p;
int err;
if (!key)
return NULL;
cert = x509_cert_parse(payload, plen);
if (IS_ERR(cert)) {
err = PTR_ERR(cert);
goto free;
}
if (cert->unsupported_sig) {
public_key_signature_free(cert->sig);
cert->sig = NULL;
}
sulen = strlen(cert->subject);
if (cert->raw_skid) {
srlen = cert->raw_skid_size;
q = cert->raw_skid;
} else {
srlen = cert->raw_serial_size;
q = cert->raw_serial;
}
err = -ENOMEM;
desc = kmalloc(sulen + 2 + srlen * 2 + 1, GFP_KERNEL);
if (!desc)
goto free;
p = memcpy(desc, cert->subject, sulen);
p += sulen;
*p++ = ':';
*p++ = ' ';
p = bin2hex(p, q, srlen);
*p = 0;
key->description = desc;
key->kids.id[0] = cert->id;
key->kids.id[1] = cert->skid;
key->public_key = cert->pub;
key->sig = cert->sig;
cert->id = NULL;
cert->skid = NULL;
cert->pub = NULL;
cert->sig = NULL;
x509_free_certificate(cert);
refcount_inc(&key->refcount);
list_add_tail(&key->list, &key_ref_to_ptr(keyring)->list);
return make_key_ref(key, 0);
free:
kfree(key);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(bp_key_create_or_update);
struct key *find_asymmetric_key(struct key *keyring,
const struct asymmetric_key_id *id_0,
const struct asymmetric_key_id *id_1,
bool partial)
{
struct key *key;
if (WARN_ON(partial))
return ERR_PTR(-ENOENT);
if (WARN_ON(!keyring))
return ERR_PTR(-EINVAL);
list_for_each_entry(key, &keyring->list, list) {
const struct asymmetric_key_ids *kids = &key->kids;
if (id_0 && (!kids->id[0] ||
!asymmetric_key_id_same(id_0, kids->id[0])))
continue;
if (id_1 && (!kids->id[1] ||
!asymmetric_key_id_same(id_0, kids->id[1])))
continue;
refcount_inc(&key->refcount);
return key;
}
return ERR_PTR(-ENOKEY);
}
struct asymmetric_key_id *
asymmetric_key_generate_id(const void *val_1, size_t len_1,
const void *val_2, size_t len_2)
{
struct asymmetric_key_id *kid;
kid = kmalloc(sizeof(struct asymmetric_key_id) + len_1 + len_2,
GFP_KERNEL);
if (!kid)
return ERR_PTR(-ENOMEM);
kid->len = len_1 + len_2;
memcpy(kid->data, val_1, len_1);
memcpy(kid->data + len_1, val_2, len_2);
return kid;
}
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