diff --git a/hw/uefi/var-service-auth.c b/hw/uefi/var-service-auth.c
new file mode 100644
index 000000000000..fba5a0956a57
--- /dev/null
+++ b/hw/uefi/var-service-auth.c
@@ -0,0 +1,361 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * uefi vars device - AuthVariableLib
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "system/dma.h"
+
+#include "hw/uefi/var-service.h"
+
+static const uint16_t name_pk[]           = u"PK";
+static const uint16_t name_kek[]          = u"KEK";
+static const uint16_t name_db[]           = u"db";
+static const uint16_t name_dbx[]          = u"dbx";
+static const uint16_t name_setup_mode[]   = u"SetupMode";
+static const uint16_t name_sigs_support[] = u"SignatureSupport";
+static const uint16_t name_sb[]           = u"SecureBoot";
+static const uint16_t name_sb_enable[]    = u"SecureBootEnable";
+static const uint16_t name_custom_mode[]  = u"CustomMode";
+static const uint16_t name_vk[]           = u"VendorKeys";
+static const uint16_t name_vk_nv[]        = u"VendorKeysNv";
+
+static const uint32_t sigdb_attrs =
+    EFI_VARIABLE_NON_VOLATILE |
+    EFI_VARIABLE_BOOTSERVICE_ACCESS |
+    EFI_VARIABLE_RUNTIME_ACCESS |
+    EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
+
+static void set_secure_boot(uefi_vars_state *uv, uint8_t sb)
+{
+    uefi_vars_set_variable(uv, EfiGlobalVariable,
+                           name_sb, sizeof(name_sb),
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                           EFI_VARIABLE_RUNTIME_ACCESS,
+                           &sb, sizeof(sb));
+}
+
+static void set_secure_boot_enable(uefi_vars_state *uv, uint8_t sbe)
+{
+    uefi_vars_set_variable(uv, EfiSecureBootEnableDisable,
+                           name_sb_enable, sizeof(name_sb_enable),
+                           EFI_VARIABLE_NON_VOLATILE |
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS,
+                           &sbe, sizeof(sbe));
+}
+
+static void set_setup_mode(uefi_vars_state *uv, uint8_t sm)
+{
+    uefi_vars_set_variable(uv, EfiGlobalVariable,
+                           name_setup_mode, sizeof(name_setup_mode),
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                           EFI_VARIABLE_RUNTIME_ACCESS,
+                           &sm, sizeof(sm));
+}
+
+static void set_custom_mode(uefi_vars_state *uv, uint8_t cm)
+{
+    uefi_vars_set_variable(uv, EfiCustomModeEnable,
+                           name_custom_mode, sizeof(name_custom_mode),
+                           EFI_VARIABLE_NON_VOLATILE |
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS,
+                           &cm, sizeof(cm));
+}
+
+static void set_signature_support(uefi_vars_state *uv)
+{
+    QemuUUID sigs_support[5];
+
+    sigs_support[0] = EfiCertSha256Guid;
+    sigs_support[1] = EfiCertSha384Guid;
+    sigs_support[2] = EfiCertSha512Guid;
+    sigs_support[3] = EfiCertRsa2048Guid;
+    sigs_support[4] = EfiCertX509Guid;
+
+    uefi_vars_set_variable(uv, EfiGlobalVariable,
+                           name_sigs_support, sizeof(name_sigs_support),
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                           EFI_VARIABLE_RUNTIME_ACCESS,
+                           sigs_support, sizeof(sigs_support));
+}
+
+static bool setup_mode_is_active(uefi_vars_state *uv)
+{
+    uefi_variable *var;
+    uint8_t *value;
+
+    var = uefi_vars_find_variable(uv, EfiGlobalVariable,
+                                  name_setup_mode, sizeof(name_setup_mode));
+    if (var) {
+        value = var->data;
+        if (value[0] == SETUP_MODE) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static bool custom_mode_is_active(uefi_vars_state *uv)
+{
+    uefi_variable *var;
+    uint8_t *value;
+
+    var = uefi_vars_find_variable(uv, EfiCustomModeEnable,
+                                  name_custom_mode, sizeof(name_custom_mode));
+    if (var) {
+        value = var->data;
+        if (value[0] == CUSTOM_SECURE_BOOT_MODE) {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool uefi_vars_is_sb_pk(uefi_variable *var)
+{
+    if (qemu_uuid_is_equal(&var->guid, &EfiGlobalVariable) &&
+        uefi_str_equal(var->name, var->name_size, name_pk, sizeof(name_pk))) {
+        return true;
+    }
+    return false;
+}
+
+static bool uefi_vars_is_sb_kek(uefi_variable *var)
+{
+    if (qemu_uuid_is_equal(&var->guid, &EfiGlobalVariable) &&
+        uefi_str_equal(var->name, var->name_size, name_kek, sizeof(name_kek))) {
+        return true;
+    }
+    return false;
+}
+
+static bool uefi_vars_is_sb_db(uefi_variable *var)
+{
+    if (!qemu_uuid_is_equal(&var->guid, &EfiImageSecurityDatabase)) {
+        return false;
+    }
+    if (uefi_str_equal(var->name, var->name_size, name_db, sizeof(name_db))) {
+        return true;
+    }
+    if (uefi_str_equal(var->name, var->name_size, name_dbx, sizeof(name_dbx))) {
+        return true;
+    }
+    return false;
+}
+
+bool uefi_vars_is_sb_any(uefi_variable *var)
+{
+    if (uefi_vars_is_sb_pk(var) ||
+        uefi_vars_is_sb_kek(var) ||
+        uefi_vars_is_sb_db(var)) {
+        return true;
+    }
+    return false;
+}
+
+static uefi_variable *uefi_vars_find_siglist(uefi_vars_state *uv,
+                                             uefi_variable *var)
+{
+    if (uefi_vars_is_sb_pk(var)) {
+        return uefi_vars_find_variable(uv, EfiGlobalVariable,
+                                       name_pk, sizeof(name_pk));
+    }
+    if (uefi_vars_is_sb_kek(var)) {
+        return uefi_vars_find_variable(uv, EfiGlobalVariable,
+                                       name_pk, sizeof(name_pk));
+    }
+    if (uefi_vars_is_sb_db(var)) {
+        return uefi_vars_find_variable(uv, EfiGlobalVariable,
+                                       name_kek, sizeof(name_kek));
+    }
+
+    return NULL;
+}
+
+static efi_status uefi_vars_check_auth_2_sb(uefi_vars_state *uv,
+                                            uefi_variable *var,
+                                            mm_variable_access *va,
+                                            void *data,
+                                            uint64_t data_offset)
+{
+    variable_auth_2 *auth = data;
+    uefi_variable *siglist;
+
+    if (custom_mode_is_active(uv)) {
+        /* no authentication in custom mode */
+        return EFI_SUCCESS;
+    }
+
+    if (setup_mode_is_active(uv) && !uefi_vars_is_sb_pk(var)) {
+        /* no authentication in setup mode (except PK) */
+        return EFI_SUCCESS;
+    }
+
+    if (auth->hdr_length == 24) {
+        /* no signature (auth->cert_data is empty) */
+        return EFI_SECURITY_VIOLATION;
+    }
+
+    siglist = uefi_vars_find_siglist(uv, var);
+    if (!siglist && setup_mode_is_active(uv) && uefi_vars_is_sb_pk(var)) {
+        /* check PK is self-signed */
+        uefi_variable tmp = {
+            .guid       = EfiGlobalVariable,
+            .name       = (uint16_t *)name_pk,
+            .name_size  = sizeof(name_pk),
+            .attributes = sigdb_attrs,
+            .data       = data + data_offset,
+            .data_size  = va->data_size - data_offset,
+        };
+        return uefi_vars_check_pkcs7_2(&tmp, NULL, NULL, va, data);
+    }
+
+    return uefi_vars_check_pkcs7_2(siglist, NULL, NULL, va, data);
+}
+
+efi_status uefi_vars_check_auth_2(uefi_vars_state *uv, uefi_variable *var,
+                                  mm_variable_access *va, void *data)
+{
+    variable_auth_2 *auth = data;
+    uint64_t data_offset;
+    efi_status status;
+
+    if (va->data_size < sizeof(*auth)) {
+        return EFI_SECURITY_VIOLATION;
+    }
+    if (uadd64_overflow(sizeof(efi_time), auth->hdr_length, &data_offset)) {
+        return EFI_SECURITY_VIOLATION;
+    }
+    if (va->data_size < data_offset) {
+        return EFI_SECURITY_VIOLATION;
+    }
+
+    if (auth->hdr_revision != 0x0200 ||
+        auth->hdr_cert_type != WIN_CERT_TYPE_EFI_GUID ||
+        !qemu_uuid_is_equal(&auth->guid_cert_type, &EfiCertTypePkcs7Guid)) {
+        return EFI_UNSUPPORTED;
+    }
+
+    if (uefi_vars_is_sb_any(var)) {
+        /* secure boot variables */
+        status = uefi_vars_check_auth_2_sb(uv, var, va, data, data_offset);
+        if (status != EFI_SUCCESS) {
+            return status;
+        }
+    } else {
+        /* other authenticated variables */
+        status = uefi_vars_check_pkcs7_2(NULL,
+                                         &var->digest, &var->digest_size,
+                                         va, data);
+        if (status != EFI_SUCCESS) {
+            return status;
+        }
+    }
+
+    /* checks passed, set variable data */
+    var->time = auth->timestamp;
+    if (va->data_size - data_offset > 0) {
+        var->data = g_malloc(va->data_size - data_offset);
+        memcpy(var->data, data + data_offset, va->data_size - data_offset);
+        var->data_size = va->data_size - data_offset;
+    }
+
+    return EFI_SUCCESS;
+}
+
+efi_status uefi_vars_check_secure_boot(uefi_vars_state *uv, uefi_variable *var)
+{
+    uint8_t *value = var->data;
+
+    if (uefi_vars_is_sb_any(var)) {
+        if (var->attributes != sigdb_attrs) {
+            return EFI_INVALID_PARAMETER;
+        }
+    }
+
+    /* reject SecureBootEnable updates if force_secure_boot is set */
+    if (qemu_uuid_is_equal(&var->guid, &EfiSecureBootEnableDisable) &&
+        uefi_str_equal(var->name, var->name_size,
+                       name_sb_enable, sizeof(name_sb_enable)) &&
+        uv->force_secure_boot &&
+        value[0] != SECURE_BOOT_ENABLE) {
+        return EFI_WRITE_PROTECTED;
+    }
+
+    /* reject CustomMode updates if disable_custom_mode is set */
+    if (qemu_uuid_is_equal(&var->guid, &EfiCustomModeEnable) &&
+        uefi_str_equal(var->name, var->name_size,
+                       name_custom_mode, sizeof(name_custom_mode)) &&
+        uv->disable_custom_mode) {
+        return EFI_WRITE_PROTECTED;
+    }
+
+    return EFI_SUCCESS;
+}
+
+/* AuthVariableLibInitialize */
+void uefi_vars_auth_init(uefi_vars_state *uv)
+{
+    uefi_variable *pk_var, *sbe_var;
+    uint8_t platform_mode, sb, sbe, vk;
+
+    /* SetupMode */
+    pk_var = uefi_vars_find_variable(uv, EfiGlobalVariable,
+                                     name_pk, sizeof(name_pk));
+    if (!pk_var) {
+        platform_mode = SETUP_MODE;
+    } else {
+        platform_mode = USER_MODE;
+    }
+    set_setup_mode(uv, platform_mode);
+
+    /* SignatureSupport */
+    set_signature_support(uv);
+
+    /* SecureBootEnable */
+    sbe = SECURE_BOOT_DISABLE;
+    sbe_var = uefi_vars_find_variable(uv, EfiSecureBootEnableDisable,
+                                      name_sb_enable, sizeof(name_sb_enable));
+    if (sbe_var) {
+        if (platform_mode == USER_MODE) {
+            sbe = ((uint8_t *)sbe_var->data)[0];
+        }
+    } else if (platform_mode == USER_MODE) {
+        sbe = SECURE_BOOT_ENABLE;
+        set_secure_boot_enable(uv, sbe);
+    }
+
+    if (uv->force_secure_boot && sbe != SECURE_BOOT_ENABLE) {
+        sbe = SECURE_BOOT_ENABLE;
+        set_secure_boot_enable(uv, sbe);
+    }
+
+    /* SecureBoot */
+    if ((sbe == SECURE_BOOT_ENABLE) && (platform_mode == USER_MODE)) {
+        sb = SECURE_BOOT_MODE_ENABLE;
+    } else {
+        sb = SECURE_BOOT_MODE_DISABLE;
+    }
+    set_secure_boot(uv, sb);
+
+    /* CustomMode */
+    set_custom_mode(uv, STANDARD_SECURE_BOOT_MODE);
+
+    vk = 0;
+    uefi_vars_set_variable(uv, EfiGlobalVariable,
+                           name_vk_nv, sizeof(name_vk_nv),
+                           EFI_VARIABLE_NON_VOLATILE |
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                           EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS,
+                           &vk, sizeof(vk));
+    uefi_vars_set_variable(uv, EfiGlobalVariable,
+                           name_vk, sizeof(name_vk),
+                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                           EFI_VARIABLE_RUNTIME_ACCESS,
+                           &vk, sizeof(vk));
+
+    /* flush to disk */
+    uefi_vars_json_save(uv);
+}
