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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
*/
#include <linux/errno.h>
#include <linux/verification.h>
#include "ipe.h"
#include "policy.h"
#include "policy_parser.h"
/**
* ipe_free_policy() - Deallocate a given IPE policy.
* @p: Supplies the policy to free.
*
* Safe to call on IS_ERR/NULL.
*/
void ipe_free_policy(struct ipe_policy *p)
{
if (IS_ERR_OR_NULL(p))
return;
ipe_free_parsed_policy(p->parsed);
/*
* p->text is allocated only when p->pkcs7 is not NULL
* otherwise it points to the plaintext data inside the pkcs7
*/
if (!p->pkcs7)
kfree(p->text);
kfree(p->pkcs7);
kfree(p);
}
static int set_pkcs7_data(void *ctx, const void *data, size_t len,
size_t asn1hdrlen __always_unused)
{
struct ipe_policy *p = ctx;
p->text = (const char *)data;
p->textlen = len;
return 0;
}
/**
* ipe_new_policy() - Allocate and parse an ipe_policy structure.
*
* @text: Supplies a pointer to the plain-text policy to parse.
* @textlen: Supplies the length of @text.
* @pkcs7: Supplies a pointer to a pkcs7-signed IPE policy.
* @pkcs7len: Supplies the length of @pkcs7.
*
* @text/@textlen Should be NULL/0 if @pkcs7/@pkcs7len is set.
*
* Return:
* * a pointer to the ipe_policy structure - Success
* * %-EBADMSG - Policy is invalid
* * %-ENOMEM - Out of memory (OOM)
* * %-ERANGE - Policy version number overflow
* * %-EINVAL - Policy version parsing error
*/
struct ipe_policy *ipe_new_policy(const char *text, size_t textlen,
const char *pkcs7, size_t pkcs7len)
{
struct ipe_policy *new = NULL;
int rc = 0;
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return ERR_PTR(-ENOMEM);
if (!text) {
new->pkcs7len = pkcs7len;
new->pkcs7 = kmemdup(pkcs7, pkcs7len, GFP_KERNEL);
if (!new->pkcs7) {
rc = -ENOMEM;
goto err;
}
rc = verify_pkcs7_signature(NULL, 0, new->pkcs7, pkcs7len, NULL,
VERIFYING_UNSPECIFIED_SIGNATURE,
set_pkcs7_data, new);
if (rc)
goto err;
} else {
new->textlen = textlen;
new->text = kstrdup(text, GFP_KERNEL);
if (!new->text) {
rc = -ENOMEM;
goto err;
}
}
rc = ipe_parse_policy(new);
if (rc)
goto err;
return new;
err:
ipe_free_policy(new);
return ERR_PTR(rc);
}
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