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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* uefi vars device - parse and generate efi signature databases
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "system/dma.h"
#include "hw/uefi/var-service.h"
/*
* Add x509 certificate to list (with duplicate check).
*/
static void uefi_vars_siglist_add_x509(uefi_vars_siglist *siglist,
QemuUUID *owner,
void *data, uint64_t size)
{
uefi_vars_cert *c;
QTAILQ_FOREACH(c, &siglist->x509, next) {
if (c->size != size) {
continue;
}
if (memcmp(c->data, data, size) != 0) {
continue;
}
return;
}
c = g_malloc(sizeof(*c) + size);
c->owner = *owner;
c->size = size;
memcpy(c->data, data, size);
QTAILQ_INSERT_TAIL(&siglist->x509, c, next);
}
/*
* Add sha256 hash to list (with duplicate check).
*/
static void uefi_vars_siglist_add_sha256(uefi_vars_siglist *siglist,
QemuUUID *owner,
void *data)
{
uefi_vars_hash *h;
QTAILQ_FOREACH(h, &siglist->sha256, next) {
if (memcmp(h->data, data, 32) != 0) {
continue;
}
return;
}
h = g_malloc(sizeof(*h) + 32);
h->owner = *owner;
memcpy(h->data, data, 32);
QTAILQ_INSERT_TAIL(&siglist->sha256, h, next);
}
void uefi_vars_siglist_init(uefi_vars_siglist *siglist)
{
memset(siglist, 0, sizeof(*siglist));
QTAILQ_INIT(&siglist->x509);
QTAILQ_INIT(&siglist->sha256);
}
void uefi_vars_siglist_free(uefi_vars_siglist *siglist)
{
uefi_vars_cert *c, *cs;
uefi_vars_hash *h, *hs;
QTAILQ_FOREACH_SAFE(c, &siglist->x509, next, cs) {
QTAILQ_REMOVE(&siglist->x509, c, next);
g_free(c);
}
QTAILQ_FOREACH_SAFE(h, &siglist->sha256, next, hs) {
QTAILQ_REMOVE(&siglist->sha256, h, next);
g_free(h);
}
}
/*
* Parse UEFI signature list.
*/
void uefi_vars_siglist_parse(uefi_vars_siglist *siglist,
void *data, uint64_t size)
{
efi_siglist *efilist;
uint64_t start;
while (size) {
if (size < sizeof(*efilist)) {
break;
}
efilist = data;
if (size < efilist->siglist_size) {
break;
}
if (uadd64_overflow(sizeof(*efilist), efilist->header_size, &start)) {
break;
}
if (efilist->sig_size <= sizeof(QemuUUID)) {
break;
}
if (qemu_uuid_is_equal(&efilist->guid_type, &EfiCertX509Guid)) {
if (start + efilist->sig_size != efilist->siglist_size) {
break;
}
uefi_vars_siglist_add_x509(siglist,
(QemuUUID *)(data + start),
data + start + sizeof(QemuUUID),
efilist->sig_size - sizeof(QemuUUID));
} else if (qemu_uuid_is_equal(&efilist->guid_type, &EfiCertSha256Guid)) {
if (efilist->sig_size != sizeof(QemuUUID) + 32) {
break;
}
if (start + efilist->sig_size > efilist->siglist_size) {
break;
}
while (start <= efilist->siglist_size - efilist->sig_size) {
uefi_vars_siglist_add_sha256(siglist,
(QemuUUID *)(data + start),
data + start + sizeof(QemuUUID));
start += efilist->sig_size;
}
} else {
QemuUUID be = qemu_uuid_bswap(efilist->guid_type);
char *str_uuid = qemu_uuid_unparse_strdup(&be);
warn_report("%s: unknown type (%s)", __func__, str_uuid);
g_free(str_uuid);
}
data += efilist->siglist_size;
size -= efilist->siglist_size;
}
}
uint64_t uefi_vars_siglist_blob_size(uefi_vars_siglist *siglist)
{
uefi_vars_cert *c;
uefi_vars_hash *h;
uint64_t size = 0;
QTAILQ_FOREACH(c, &siglist->x509, next) {
size += sizeof(efi_siglist) + sizeof(QemuUUID) + c->size;
}
if (!QTAILQ_EMPTY(&siglist->sha256)) {
size += sizeof(efi_siglist);
QTAILQ_FOREACH(h, &siglist->sha256, next) {
size += sizeof(QemuUUID) + 32;
}
}
return size;
}
/*
* Generate UEFI signature list.
*/
void uefi_vars_siglist_blob_generate(uefi_vars_siglist *siglist,
void *data, uint64_t size)
{
uefi_vars_cert *c;
uefi_vars_hash *h;
efi_siglist *efilist;
uint64_t pos = 0, start;
uint32_t i;
QTAILQ_FOREACH(c, &siglist->x509, next) {
efilist = data + pos;
efilist->guid_type = EfiCertX509Guid;
efilist->sig_size = sizeof(QemuUUID) + c->size;
efilist->header_size = 0;
start = pos + sizeof(efi_siglist);
memcpy(data + start,
&c->owner, sizeof(QemuUUID));
memcpy(data + start + sizeof(QemuUUID),
c->data, c->size);
efilist->siglist_size = sizeof(efi_siglist) + efilist->sig_size;
pos += efilist->siglist_size;
}
if (!QTAILQ_EMPTY(&siglist->sha256)) {
efilist = data + pos;
efilist->guid_type = EfiCertSha256Guid;
efilist->sig_size = sizeof(QemuUUID) + 32;
efilist->header_size = 0;
i = 0;
start = pos + sizeof(efi_siglist);
QTAILQ_FOREACH(h, &siglist->sha256, next) {
memcpy(data + start + efilist->sig_size * i,
&h->owner, sizeof(QemuUUID));
memcpy(data + start + efilist->sig_size * i + sizeof(QemuUUID),
h->data, 32);
i++;
}
efilist->siglist_size = sizeof(efi_siglist) + efilist->sig_size * i;
pos += efilist->siglist_size;
}
assert(pos == size);
}
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