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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c')
-rw-r--r-- | drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c b/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c new file mode 100644 index 000000000..86ec962aa --- /dev/null +++ b/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to SET password methods under BIOS attributes interface GUID + * + * Copyright (c) 2020 Dell Inc. + */ + +#include <linux/wmi.h> +#include "dell-wmi-sysman.h" + +static int call_password_interface(struct wmi_device *wdev, char *in_args, size_t size) +{ + struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; + struct acpi_buffer input; + union acpi_object *obj; + acpi_status status; + int ret = -EIO; + + input.length = (acpi_size) size; + input.pointer = in_args; + status = wmidev_evaluate_method(wdev, 0, 1, &input, &output); + if (ACPI_FAILURE(status)) + return -EIO; + obj = (union acpi_object *)output.pointer; + if (obj->type == ACPI_TYPE_INTEGER) + ret = obj->integer.value; + + kfree(output.pointer); + /* let userland know it may need to check is_password_set again */ + kobject_uevent(&wmi_priv.class_dev->kobj, KOBJ_CHANGE); + return map_wmi_error(ret); +} + +/** + * set_new_password() - Sets a system admin password + * @password_type: The type of password to set + * @new: The new password + * + * Sets the password using plaintext interface + */ +int set_new_password(const char *password_type, const char *new) +{ + size_t password_type_size, current_password_size, new_size; + size_t security_area_size, buffer_size; + char *buffer = NULL, *start; + char *current_password; + int ret; + + mutex_lock(&wmi_priv.mutex); + if (!wmi_priv.password_attr_wdev) { + ret = -ENODEV; + goto out; + } + if (strcmp(password_type, "Admin") == 0) { + current_password = wmi_priv.current_admin_password; + } else if (strcmp(password_type, "System") == 0) { + current_password = wmi_priv.current_system_password; + } else { + ret = -EINVAL; + dev_err(&wmi_priv.password_attr_wdev->dev, "unknown password type %s\n", + password_type); + goto out; + } + + /* build/calculate buffer */ + security_area_size = calculate_security_buffer(wmi_priv.current_admin_password); + password_type_size = calculate_string_buffer(password_type); + current_password_size = calculate_string_buffer(current_password); + new_size = calculate_string_buffer(new); + buffer_size = security_area_size + password_type_size + current_password_size + new_size; + buffer = kzalloc(buffer_size, GFP_KERNEL); + if (!buffer) { + ret = -ENOMEM; + goto out; + } + + /* build security area */ + populate_security_buffer(buffer, wmi_priv.current_admin_password); + + /* build variables to set */ + start = buffer + security_area_size; + ret = populate_string_buffer(start, password_type_size, password_type); + if (ret < 0) + goto out; + + start += ret; + ret = populate_string_buffer(start, current_password_size, current_password); + if (ret < 0) + goto out; + + start += ret; + ret = populate_string_buffer(start, new_size, new); + if (ret < 0) + goto out; + + print_hex_dump_bytes("set new password data: ", DUMP_PREFIX_NONE, buffer, buffer_size); + ret = call_password_interface(wmi_priv.password_attr_wdev, buffer, buffer_size); + /* on success copy the new password to current password */ + if (!ret) + strscpy(current_password, new, MAX_BUFF); + /* explain to user the detailed failure reason */ + else if (ret == -EOPNOTSUPP) + dev_err(&wmi_priv.password_attr_wdev->dev, "admin password must be configured\n"); + else if (ret == -EACCES) + dev_err(&wmi_priv.password_attr_wdev->dev, "invalid password\n"); + +out: + kfree(buffer); + mutex_unlock(&wmi_priv.mutex); + + return ret; +} + +static int bios_attr_pass_interface_probe(struct wmi_device *wdev, const void *context) +{ + mutex_lock(&wmi_priv.mutex); + wmi_priv.password_attr_wdev = wdev; + mutex_unlock(&wmi_priv.mutex); + return 0; +} + +static void bios_attr_pass_interface_remove(struct wmi_device *wdev) +{ + mutex_lock(&wmi_priv.mutex); + wmi_priv.password_attr_wdev = NULL; + mutex_unlock(&wmi_priv.mutex); +} + +static const struct wmi_device_id bios_attr_pass_interface_id_table[] = { + { .guid_string = DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID }, + { }, +}; +static struct wmi_driver bios_attr_pass_interface_driver = { + .driver = { + .name = DRIVER_NAME"-password" + }, + .probe = bios_attr_pass_interface_probe, + .remove = bios_attr_pass_interface_remove, + .id_table = bios_attr_pass_interface_id_table, +}; + +int init_bios_attr_pass_interface(void) +{ + return wmi_driver_register(&bios_attr_pass_interface_driver); +} + +void exit_bios_attr_pass_interface(void) +{ + wmi_driver_unregister(&bios_attr_pass_interface_driver); +} + +MODULE_DEVICE_TABLE(wmi, bios_attr_pass_interface_id_table); |