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152 lines
4.3 KiB
152 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Functions corresponding to SET password methods under BIOS attributes interface GUID |
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* |
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* Copyright (c) 2020 Dell Inc. |
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*/ |
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#include <linux/wmi.h> |
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#include "dell-wmi-sysman.h" |
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static int call_password_interface(struct wmi_device *wdev, char *in_args, size_t size) |
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{ |
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struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
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struct acpi_buffer input; |
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union acpi_object *obj; |
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acpi_status status; |
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int ret = -EIO; |
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input.length = (acpi_size) size; |
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input.pointer = in_args; |
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status = wmidev_evaluate_method(wdev, 0, 1, &input, &output); |
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if (ACPI_FAILURE(status)) |
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return -EIO; |
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obj = (union acpi_object *)output.pointer; |
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if (obj->type == ACPI_TYPE_INTEGER) |
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ret = obj->integer.value; |
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kfree(output.pointer); |
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/* let userland know it may need to check is_password_set again */ |
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kobject_uevent(&wmi_priv.class_dev->kobj, KOBJ_CHANGE); |
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return map_wmi_error(ret); |
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} |
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/** |
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* set_new_password() - Sets a system admin password |
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* @password_type: The type of password to set |
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* @new: The new password |
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* |
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* Sets the password using plaintext interface |
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*/ |
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int set_new_password(const char *password_type, const char *new) |
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{ |
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size_t password_type_size, current_password_size, new_size; |
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size_t security_area_size, buffer_size; |
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char *buffer = NULL, *start; |
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char *current_password; |
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int ret; |
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mutex_lock(&wmi_priv.mutex); |
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if (!wmi_priv.password_attr_wdev) { |
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ret = -ENODEV; |
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goto out; |
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} |
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if (strcmp(password_type, "Admin") == 0) { |
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current_password = wmi_priv.current_admin_password; |
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} else if (strcmp(password_type, "System") == 0) { |
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current_password = wmi_priv.current_system_password; |
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} else { |
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ret = -EINVAL; |
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dev_err(&wmi_priv.password_attr_wdev->dev, "unknown password type %s\n", |
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password_type); |
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goto out; |
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} |
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/* build/calculate buffer */ |
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security_area_size = calculate_security_buffer(wmi_priv.current_admin_password); |
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password_type_size = calculate_string_buffer(password_type); |
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current_password_size = calculate_string_buffer(current_password); |
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new_size = calculate_string_buffer(new); |
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buffer_size = security_area_size + password_type_size + current_password_size + new_size; |
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buffer = kzalloc(buffer_size, GFP_KERNEL); |
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if (!buffer) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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/* build security area */ |
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populate_security_buffer(buffer, wmi_priv.current_admin_password); |
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/* build variables to set */ |
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start = buffer + security_area_size; |
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ret = populate_string_buffer(start, password_type_size, password_type); |
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if (ret < 0) |
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goto out; |
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start += ret; |
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ret = populate_string_buffer(start, current_password_size, current_password); |
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if (ret < 0) |
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goto out; |
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start += ret; |
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ret = populate_string_buffer(start, new_size, new); |
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if (ret < 0) |
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goto out; |
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print_hex_dump_bytes("set new password data: ", DUMP_PREFIX_NONE, buffer, buffer_size); |
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ret = call_password_interface(wmi_priv.password_attr_wdev, buffer, buffer_size); |
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/* clear current_password here and use user input from wmi_priv.current_password */ |
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if (!ret) |
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memset(current_password, 0, MAX_BUFF); |
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/* explain to user the detailed failure reason */ |
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else if (ret == -EOPNOTSUPP) |
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dev_err(&wmi_priv.password_attr_wdev->dev, "admin password must be configured\n"); |
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else if (ret == -EACCES) |
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dev_err(&wmi_priv.password_attr_wdev->dev, "invalid password\n"); |
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out: |
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kfree(buffer); |
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mutex_unlock(&wmi_priv.mutex); |
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return ret; |
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} |
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static int bios_attr_pass_interface_probe(struct wmi_device *wdev, const void *context) |
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{ |
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mutex_lock(&wmi_priv.mutex); |
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wmi_priv.password_attr_wdev = wdev; |
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mutex_unlock(&wmi_priv.mutex); |
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return 0; |
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} |
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static void bios_attr_pass_interface_remove(struct wmi_device *wdev) |
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{ |
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mutex_lock(&wmi_priv.mutex); |
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wmi_priv.password_attr_wdev = NULL; |
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mutex_unlock(&wmi_priv.mutex); |
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} |
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static const struct wmi_device_id bios_attr_pass_interface_id_table[] = { |
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{ .guid_string = DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID }, |
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{ }, |
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}; |
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static struct wmi_driver bios_attr_pass_interface_driver = { |
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.driver = { |
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.name = DRIVER_NAME"-password" |
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}, |
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.probe = bios_attr_pass_interface_probe, |
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.remove = bios_attr_pass_interface_remove, |
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.id_table = bios_attr_pass_interface_id_table, |
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}; |
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int init_bios_attr_pass_interface(void) |
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{ |
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return wmi_driver_register(&bios_attr_pass_interface_driver); |
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} |
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void exit_bios_attr_pass_interface(void) |
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{ |
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wmi_driver_unregister(&bios_attr_pass_interface_driver); |
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} |
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MODULE_DEVICE_TABLE(wmi, bios_attr_pass_interface_id_table);
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