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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 IBM Corporation, Srish Srinivasan <ssrish@linux.ibm.com>
*/
#include <keys/trusted_pkwm.h>
#include <keys/trusted-type.h>
#include <linux/build_bug.h>
#include <linux/key-type.h>
#include <linux/parser.h>
#include <asm/plpks.h>
enum {
Opt_err,
Opt_wrap_flags,
};
static const match_table_t key_tokens = {
{Opt_wrap_flags, "wrap_flags=%s"},
{Opt_err, NULL}
};
static int getoptions(char *datablob, struct trusted_key_options *opt)
{
substring_t args[MAX_OPT_ARGS];
char *p = datablob;
int token;
int res;
u16 wrap_flags;
unsigned long token_mask = 0;
struct trusted_pkwm_options *pkwm;
if (!datablob)
return 0;
pkwm = opt->private;
while ((p = strsep(&datablob, " \t"))) {
if (*p == '\0' || *p == ' ' || *p == '\t')
continue;
token = match_token(p, key_tokens, args);
if (test_and_set_bit(token, &token_mask))
return -EINVAL;
switch (token) {
case Opt_wrap_flags:
res = kstrtou16(args[0].from, 16, &wrap_flags);
if (res < 0 || wrap_flags > 2)
return -EINVAL;
pkwm->wrap_flags = wrap_flags;
break;
default:
return -EINVAL;
}
}
return 0;
}
static struct trusted_key_options *trusted_options_alloc(void)
{
struct trusted_key_options *options;
struct trusted_pkwm_options *pkwm;
options = kzalloc(sizeof(*options), GFP_KERNEL);
if (options) {
pkwm = kzalloc(sizeof(*pkwm), GFP_KERNEL);
if (!pkwm) {
kfree_sensitive(options);
options = NULL;
} else {
options->private = pkwm;
}
}
return options;
}
static int trusted_pkwm_seal(struct trusted_key_payload *p, char *datablob)
{
struct trusted_key_options *options = NULL;
struct trusted_pkwm_options *pkwm = NULL;
u8 *input_buf, *output_buf;
u32 output_len, input_len;
int rc;
options = trusted_options_alloc();
if (!options)
return -ENOMEM;
rc = getoptions(datablob, options);
if (rc < 0)
goto out;
dump_options(options);
input_len = p->key_len;
input_buf = kmalloc(ALIGN(input_len, 4096), GFP_KERNEL);
if (!input_buf) {
pr_err("Input buffer allocation failed. Returning -ENOMEM.");
rc = -ENOMEM;
goto out;
}
memcpy(input_buf, p->key, p->key_len);
pkwm = options->private;
rc = plpks_wrap_object(&input_buf, input_len, pkwm->wrap_flags,
&output_buf, &output_len);
if (!rc) {
memcpy(p->blob, output_buf, output_len);
p->blob_len = output_len;
dump_payload(p);
} else {
pr_err("Wrapping of payload key failed: %d\n", rc);
}
kfree(input_buf);
kfree(output_buf);
out:
kfree_sensitive(options->private);
kfree_sensitive(options);
return rc;
}
static int trusted_pkwm_unseal(struct trusted_key_payload *p, char *datablob)
{
u8 *input_buf, *output_buf;
u32 input_len, output_len;
int rc;
input_len = p->blob_len;
input_buf = kmalloc(ALIGN(input_len, 4096), GFP_KERNEL);
if (!input_buf) {
pr_err("Input buffer allocation failed. Returning -ENOMEM.");
return -ENOMEM;
}
memcpy(input_buf, p->blob, p->blob_len);
rc = plpks_unwrap_object(&input_buf, input_len, &output_buf,
&output_len);
if (!rc) {
memcpy(p->key, output_buf, output_len);
p->key_len = output_len;
dump_payload(p);
} else {
pr_err("Unwrapping of payload failed: %d\n", rc);
}
kfree(input_buf);
kfree(output_buf);
return rc;
}
static int trusted_pkwm_init(void)
{
int ret;
if (!plpks_wrapping_is_supported()) {
pr_err("H_PKS_WRAP_OBJECT interface not supported\n");
return -ENODEV;
}
ret = plpks_gen_wrapping_key();
if (ret) {
pr_err("Failed to generate default wrapping key\n");
return -EINVAL;
}
return register_key_type(&key_type_trusted);
}
static void trusted_pkwm_exit(void)
{
unregister_key_type(&key_type_trusted);
}
struct trusted_key_ops pkwm_trusted_key_ops = {
.migratable = 0, /* non-migratable */
.init = trusted_pkwm_init,
.seal = trusted_pkwm_seal,
.unseal = trusted_pkwm_unseal,
.exit = trusted_pkwm_exit,
};
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