Received: by 2002:a05:6358:3188:b0:123:57c1:9b43 with SMTP id q8csp3005961rwd; Fri, 19 May 2023 13:26:20 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ4J9ZfIyzz7M6ggrXRES28+9PaBuRz+q5litQRMAS2d2q8JuENdI49VAaLUDjD0ZMQ02/hC X-Received: by 2002:a17:902:ecd0:b0:1a1:b3bb:cd5b with SMTP id a16-20020a170902ecd000b001a1b3bbcd5bmr3644181plh.62.1684527980249; Fri, 19 May 2023 13:26:20 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1684527980; cv=none; d=google.com; s=arc-20160816; b=wFAhuGbm9HsntFRE7V3SljvfwrnW9z/WCyFOoKbridE7/8M4LnWZVUdWCAAxg8PILa I3hMHDPjMNEPdkS2AWZiy7gmE7qvZO5vZDmJ+MsnRrpDytJ830aGikJzXaWqSpuRxpsd eZznaw1ynAERc89SajkNFw2dJxVKdQpywr5GTFS767EvpRcf4+/OtaIQfph7VpBPiAiF pPY/9K5ixV7ugzc0MfI9yBgihLiPmU3xdNboypJelatw9iKrkJiuMnvoOIrYPK7YnY/0 uTRDXuXnwvuTRmrldaoqrjno5rMqMwf1kiwfj5pn4sln6Ldl9gL/JVUfpKmkHx4On0hf 171w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:to:from :dkim-signature; bh=2opJ1+W5HOUNs6DOaSrjyXEyOXFf95SoCXdS03bl+3g=; b=cdBTU01vyJx07UQOna2ss7FHqquEO9261UZCJ8iZtw3flgJX/WYBDvRtk4M0HJexwe m79cs9KqRaw5f8Wu9A9N8aNxrGO9D0jhcxoYaGchbtL+dZ5/gdFs/xb/aJMN7Dp3GHDl rucX70Y/AFbNpm3TFYjIiAS8O5p4xsL998s2zQoA9t4ikjZIzJJkUUmXJl5qaVbQxh2j Wt/MUnj9MzZiF1ck/sOgH1s5NfR7ZsSG0B5X73nnAm33+P0PO1hvPLvY4nDd8/OEUkT5 6tfzZnF5d48HmOH9hTHPlL7l4qiw48AqHL624KS9H4P7qWXXYTmwu+/iLncoZ3O1h2pI FgbA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20221208 header.b=G0bslNp1; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id a4-20020a1709027d8400b001ab0993941bsi58361plm.311.2023.05.19.13.25.56; Fri, 19 May 2023 13:26:20 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20221208 header.b=G0bslNp1; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231294AbjESUNi (ORCPT + 99 others); Fri, 19 May 2023 16:13:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230171AbjESUNU (ORCPT ); Fri, 19 May 2023 16:13:20 -0400 Received: from mail-oa1-x33.google.com (mail-oa1-x33.google.com [IPv6:2001:4860:4864:20::33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC8E2E60; Fri, 19 May 2023 13:13:12 -0700 (PDT) Received: by mail-oa1-x33.google.com with SMTP id 586e51a60fabf-192b1a4dd2eso1729787fac.1; Fri, 19 May 2023 13:13:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684527192; x=1687119192; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=2opJ1+W5HOUNs6DOaSrjyXEyOXFf95SoCXdS03bl+3g=; b=G0bslNp1aJnRVrekok2A5lMdXWsdOXNnW/VNd1R/RIIDpzfVEZ9k8aGzrW3iRQAEio V9bl33pzy4rG+RsQT8JbRIMiBfTF8+1K9O8Cm6gSAtdWZhdqi+lAwUhwvhPy4t0wi3gc pGq7nebmo6L9IEkreHdDWp7GS7ROLvBEg5ABmc/AK1ISZhjKIt9usXogP+75F+N5axJJ Yja/m+xLs+I/N3gnRtLnHDAlpV7YcEhXACcyeMqPXcTUya9ZHfFbrL2lbOnqR4S3A/3q xBR7Lx4QsCKLvw68UrSJ2ZDRV1Z9yA9okkx589JjGMFzae2+4nUFtUOJ5NfHXXtWmkSr NNiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684527192; x=1687119192; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2opJ1+W5HOUNs6DOaSrjyXEyOXFf95SoCXdS03bl+3g=; b=VGSMfG1NlwlaVx2kXNaxknaewvAiG3h6nbAb1hedqfnbcev1z9502yOwyZeCPnfzDB mWV2GGQbEiIY5qll4Pv7pqRJYYQwgMBjSq1byXHNzxSRfmltx/HWbqi+OLprPFOiuadz U1oSHaBe7UugPY+cRcr93pJfXbtoX3gg5/PCfKCjG0FEEPVIYURnIpOFN12ouC3lcJ3i EqwbsIm6YSKZ735LJfzpvexQDV8a6WotQ3qAwH8JtVqpT1Hf5os1HTxFFEfQyJ9Uw3K0 iyjuN2AEnsrUyoIqJPXyDYLLNcuv8UvHwmWj5NgbLFIkIO9rm0upnp/+6sdp67fjHfd0 W3Hw== X-Gm-Message-State: AC+VfDwFNr+PtrD2iKXziLWRIWIKHBUu3B9Z3fjk3CLClDuN1QNa2GJt +wgDAaYV0YPx6IyZubhOPls= X-Received: by 2002:a05:6870:df4b:b0:199:da44:403a with SMTP id ur11-20020a056870df4b00b00199da44403amr1520897oab.33.1684527191961; Fri, 19 May 2023 13:13:11 -0700 (PDT) Received: from grumpy-VECTOR.hsd1.tx.comcast.net ([2601:2c3:480:7390:e6dc:4936:31b7:d3d0]) by smtp.gmail.com with ESMTPSA id g4-20020a056870d20400b001964dc3dadesm2325239oac.45.2023.05.19.13.13.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 May 2023 13:13:11 -0700 (PDT) From: Jorge Lopez X-Google-Original-From: Jorge Lopez To: hdegoede@redhat.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, thomas@t-8ch.de, ilpo.jarvinen@linux.intel.com Subject: [PATCH v15 08/13] hp-bioscfg: passwdobj-attributes Date: Fri, 19 May 2023 15:12:55 -0500 Message-Id: <20230519201300.12964-9-jorge.lopez2@hp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230519201300.12964-1-jorge.lopez2@hp.com> References: <20230519201300.12964-1-jorge.lopez2@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org HP BIOS Configuration driver purpose is to provide a driver supporting the latest sysfs class firmware attributes framework allowing the user to change BIOS settings and security solutions on HP Inc.’s commercial notebooks. Many features of HP Commercial notebooks can be managed using Windows Management Instrumentation (WMI). WMI is an implementation of Web-Based Enterprise Management (WBEM) that provides a standards-based interface for changing and monitoring system settings. HP BIOSCFG driver provides a native Linux solution and the exposed features facilitates the migration to Linux environments. The Linux security features to be provided in hp-bioscfg driver enables managing the BIOS settings and security solutions via sysfs, a virtual filesystem that can be used by user-mode applications. The new documentation cover HP-specific firmware sysfs attributes such Secure Platform Management and Sure Start. Each section provides security feature description and identifies sysfs directories and files exposed by the driver. Many HP Commercial notebooks include a feature called Secure Platform Management (SPM), which replaces older password-based BIOS settings management with public key cryptography. PC secure product management begins when a target system is provisioned with cryptographic keys that are used to ensure the integrity of communications between system management utilities and the BIOS. HP Commercial notebooks have several BIOS settings that control its behaviour and capabilities, many of which are related to security. To prevent unauthorized changes to these settings, the system can be configured to use a cryptographic signature-based authorization string that the BIOS will use to verify authorization to modify the setting. Linux Security components are under development and not published yet. The only linux component is the driver (hp bioscfg) at this time. Other published security components are under Windows. Signed-off-by: Jorge Lopez --- Based on the latest platform-drivers-x86.git/for-next --- .../x86/hp/hp-bioscfg/passwdobj-attributes.c | 540 ++++++++++++++++++ 1 file changed, 540 insertions(+) create mode 100644 drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c diff --git a/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c new file mode 100644 index 000000000000..483426696144 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c @@ -0,0 +1,540 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to password object type attributes under + * BIOS PASSWORD for use with hp-bioscfg driver. + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" +#include + +GET_INSTANCE_ID(password); +/* + * Clear all passwords copied to memory for a particular + * authentication instance + */ +static int clear_passwords(const int instance) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance]; + + if (!password_data->is_enabled) + return 0; + + memset(password_data->current_password, + 0, sizeof(password_data->current_password)); + memset(password_data->new_password, + 0, sizeof(password_data->new_password)); + + return 0; +} + +/* + * Clear all credentials copied to memory for both Power-ON and Setup + * BIOS instances + */ +int hp_clear_all_credentials(void) +{ + int count = bioscfg_drv.password_instances_count; + int instance; + + /* clear all passwords */ + for (instance = 0; instance < count; instance++) + clear_passwords(instance); + + /* clear auth_token */ + kfree(bioscfg_drv.spm_data.auth_token); + bioscfg_drv.spm_data.auth_token = NULL; + + return 0; +} + +int hp_get_password_instance_for_type(const char *name) +{ + int count = bioscfg_drv.password_instances_count; + int instance; + + for (instance = 0; instance < count; instance++) + if (!strcmp(bioscfg_drv.password_data[instance].common.display_name, name)) + return instance; + + return -EINVAL; +} + +static int validate_password_input(int instance_id, const char *buf) +{ + int length; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + length = strlen(buf); + if (buf[length - 1] == '\n') + length--; + + if (length > MAX_PASSWD_SIZE) + return INVALID_BIOS_AUTH; + + if (password_data->min_password_length > length || + password_data->max_password_length < length) + return INVALID_BIOS_AUTH; + return SUCCESS; +} + +ATTRIBUTE_N_PROPERTY_SHOW(is_enabled, password); +static struct kobj_attribute password_is_password_set = __ATTR_RO(is_enabled); + +static int store_password_instance(struct kobject *kobj, const char *buf, + size_t count, bool is_current) +{ + char *buf_cp; + int id, ret = 0; + + buf_cp = kstrdup(buf, GFP_KERNEL); + if (!buf_cp) + return -ENOMEM; + + ret = hp_enforce_single_line_input(buf_cp, count); + if (!ret) { + id = get_password_instance_id(kobj); + + if (id >= 0) + ret = validate_password_input(id, buf_cp); + } + + if (!ret) { + if (is_current) + strscpy(bioscfg_drv.password_data[id].current_password, + buf_cp, + sizeof(bioscfg_drv.password_data[id].current_password)); + else + strscpy(bioscfg_drv.password_data[id].new_password, + buf_cp, + sizeof(bioscfg_drv.password_data[id].new_password)); + } + + kfree(buf_cp); + return ret < 0 ? ret : count; +} + +static ssize_t current_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + return store_password_instance(kobj, buf, count, true); +} + +static struct kobj_attribute password_current_password = __ATTR_WO(current_password); + +static ssize_t new_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + return store_password_instance(kobj, buf, count, true); +} + +static struct kobj_attribute password_new_password = __ATTR_WO(new_password); + +ATTRIBUTE_N_PROPERTY_SHOW(min_password_length, password); +static struct kobj_attribute password_min_password_length = __ATTR_RO(min_password_length); + +ATTRIBUTE_N_PROPERTY_SHOW(max_password_length, password); +static struct kobj_attribute password_max_password_length = __ATTR_RO(max_password_length); + +static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + if (!strcmp(kobj->name, SETUP_PASSWD)) + return sysfs_emit(buf, "%s\n", BIOS_ADMIN); + + if (!strcmp(kobj->name, POWER_ON_PASSWD)) + return sysfs_emit(buf, "%s\n", POWER_ON); + + return -EIO; +} + +static struct kobj_attribute password_role = __ATTR_RO(role); + +static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + int i = get_password_instance_id(kobj); + + if (i < 0) + return i; + + if (bioscfg_drv.password_data[i].mechanism != PASSWORD) + return -EINVAL; + + return sysfs_emit(buf, "%s\n", PASSWD_MECHANISM_TYPES); +} + +static struct kobj_attribute password_mechanism = __ATTR_RO(mechanism); + +ATTRIBUTE_VALUES_PROPERTY_SHOW(encodings, password, SEMICOLON_SEP); +static struct kobj_attribute password_encodings_val = __ATTR_RO(encodings); + +static struct attribute *password_attrs[] = { + &password_is_password_set.attr, + &password_min_password_length.attr, + &password_max_password_length.attr, + &password_current_password.attr, + &password_new_password.attr, + &password_role.attr, + &password_mechanism.attr, + &password_encodings_val.attr, + NULL +}; + +static const struct attribute_group password_attr_group = { + .attrs = password_attrs +}; + +int hp_alloc_password_data(void) +{ + bioscfg_drv.password_instances_count = hp_get_instance_count(HP_WMI_BIOS_PASSWORD_GUID); + bioscfg_drv.password_data = kcalloc(bioscfg_drv.password_instances_count, + sizeof(*bioscfg_drv.password_data), GFP_KERNEL); + if (!bioscfg_drv.password_data) { + bioscfg_drv.password_instances_count = 0; + return -ENOMEM; + } + + return 0; +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_password_types[] = { + [NAME] = ACPI_TYPE_STRING, + [VALUE] = ACPI_TYPE_STRING, + [PATH] = ACPI_TYPE_STRING, + [IS_READONLY] = ACPI_TYPE_INTEGER, + [DISPLAY_IN_UI] = ACPI_TYPE_INTEGER, + [REQUIRES_PHYSICAL_PRESENCE] = ACPI_TYPE_INTEGER, + [SEQUENCE] = ACPI_TYPE_INTEGER, + [PREREQUISITES_SIZE] = ACPI_TYPE_INTEGER, + [PREREQUISITES] = ACPI_TYPE_STRING, + [SECURITY_LEVEL] = ACPI_TYPE_INTEGER, + [PSWD_MIN_LENGTH] = ACPI_TYPE_INTEGER, + [PSWD_MAX_LENGTH] = ACPI_TYPE_INTEGER, + [PSWD_SIZE] = ACPI_TYPE_INTEGER, + [PSWD_ENCODINGS] = ACPI_TYPE_STRING, + [PSWD_IS_SET] = ACPI_TYPE_INTEGER, +}; + +static int hp_populate_password_elements_from_package(union acpi_object *password_obj, + int password_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + int ret; + u32 size; + u32 int_value; + int elem; + int reqs; + int eloc; + int pos_values; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + if (!password_obj) + return -EINVAL; + + for (elem = 1, eloc = 1; elem < password_obj_count; elem++, eloc++) { + /* ONLY look at the first PASSWORD_ELEM_CNT elements */ + if (eloc == PSWD_ELEM_CNT) + goto exit_package; + + switch (password_obj[elem].type) { + case ACPI_TYPE_STRING: + if (PREREQUISITES != elem && PSWD_ENCODINGS != elem) { + ret = hp_convert_hexstr_to_str(password_obj[elem].string.pointer, + password_obj[elem].string.length, + &str_value, &value_len); + if (ret) + continue; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)password_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", password_obj[elem].type); + continue; + } + + /* Check that both expected and read object type match */ + if (expected_password_types[eloc] != password_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_password_types[eloc], elem, password_obj[elem].type); + return -EIO; + } + + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + break; + case PATH: + strscpy(password_data->common.path, str_value, + sizeof(password_data->common.path)); + break; + case IS_READONLY: + password_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + password_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + password_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + password_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + password_data->common.prerequisites_size = int_value; + if (int_value > MAX_PREREQUISITES_SIZE) + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + + /* This HACK is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. PREREQUISITES + * object is omitted by BIOS when the size is + * zero. + */ + if (int_value == 0) + eloc++; + break; + case PREREQUISITES: + size = min_t(u32, password_data->common.prerequisites_size, + MAX_PREREQUISITES_SIZE); + + for (reqs = 0; reqs < size; reqs++) { + ret = hp_convert_hexstr_to_str(password_obj[elem + reqs].string.pointer, + password_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + break; + + strscpy(password_data->common.prerequisites[reqs], + str_value, + sizeof(password_data->common.prerequisites[reqs])); + + kfree(str_value); + } + break; + case SECURITY_LEVEL: + password_data->common.security_level = int_value; + break; + case PSWD_MIN_LENGTH: + password_data->min_password_length = int_value; + break; + case PSWD_MAX_LENGTH: + password_data->max_password_length = int_value; + break; + case PSWD_SIZE: + password_data->encodings_size = int_value; + if (int_value > MAX_ENCODINGS_SIZE) + pr_warn("Password Encoding size value exceeded the maximum number of elements supported or data may be malformed\n"); + + /* This HACK is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. PSWD_ENCODINGS + * object is omitted by BIOS when the size is + * zero. + */ + if (int_value == 0) + eloc++; + break; + case PSWD_ENCODINGS: + size = min_t(u32, password_data->encodings_size, MAX_ENCODINGS_SIZE); + for (pos_values = 0; pos_values < size; pos_values++) { + ret = hp_convert_hexstr_to_str(password_obj[elem + pos_values].string.pointer, + password_obj[elem + pos_values].string.length, + &str_value, &value_len); + if (ret) + break; + + strscpy(password_data->encodings[pos_values], + str_value, + sizeof(password_data->encodings[pos_values])); + kfree(str_value); + } + break; + case PSWD_IS_SET: + password_data->is_enabled = int_value; + break; + default: + pr_warn("Invalid element: %d found in Password attribute or data may be malformed\n", elem); + break; + } + } + +exit_package: + kfree(str_value); + return 0; +} + +/** + * hp_populate_password_package_data() + * Populate all properties for an instance under password attribute + * + * @password_obj: ACPI object with password data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_password_package_data(union acpi_object *password_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + password_data->attr_name_kobj = attr_name_kobj; + + hp_populate_password_elements_from_package(password_obj, + password_obj->package.count, + instance_id); + + hp_friendly_user_name_update(password_data->common.path, + attr_name_kobj->name, + password_data->common.display_name, + sizeof(password_data->common.display_name)); + + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + return sysfs_create_group(attr_name_kobj, &password_attr_group); + + return sysfs_create_group(attr_name_kobj, &password_attr_group); +} + +static int hp_populate_password_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int reqs; + int values; + int isreadonly; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + // VALUE: + hp_get_string_from_buffer(&buffer_ptr, buffer_size, password_data->current_password, + sizeof(password_data->current_password)); + + // PATH: + hp_get_string_from_buffer(&buffer_ptr, buffer_size, password_data->common.path, + sizeof(password_data->common.path)); + + // IS_READONLY: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.is_readonly); + + //DISPLAY_IN_UI: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.display_in_ui); + + // REQUIRES_PHYSICAL_PRESENCE: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.requires_physical_presence); + + // SEQUENCE: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.sequence); + + // PREREQUISITES_SIZE: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.prerequisites_size); + + if (password_data->common.prerequisites_size > MAX_PREREQUISITES_SIZE) { + /* Report a message and limit prerequisite size to maximum value */ + pr_warn("Password Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + password_data->common.prerequisites_size = MAX_PREREQUISITES_SIZE; + } + + // PREREQUISITES: + for (reqs = 0; reqs < password_data->common.prerequisites_size; reqs++) + hp_get_string_from_buffer(&buffer_ptr, buffer_size, + password_data->common.prerequisites[reqs], + sizeof(password_data->common.prerequisites[reqs])); + + // SECURITY_LEVEL: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->common.security_level); + + // PSWD_MIN_LENGTH: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->min_password_length); + + // PSWD_MAX_LENGTH: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->max_password_length); + + // PSWD_SIZE: + if (password_data->encodings_size > MAX_ENCODINGS_SIZE) { + /* Report a message and limit possible values size to maximum value */ + pr_warn("Password Encoding size value exceeded the maximum number of elements supported or data may be malformed\n"); + password_data->encodings_size = MAX_ENCODINGS_SIZE; + } + + // PSWD_ENCODINGS: + for (values = 0; values < password_data->encodings_size; values++) + hp_get_string_from_buffer(&buffer_ptr, buffer_size, + password_data->encodings[values], + sizeof(password_data->encodings[values])); + + // PSWD_IS_SET: + hp_get_integer_from_buffer(&buffer_ptr, buffer_size, &isreadonly); + password_data->is_enabled = isreadonly ? true : false; + + return 0; +} + +/** + * hp_populate_password_buffer_data() + * Populate all properties for an instance under password object attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_password_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, + struct kobject *attr_name_kobj) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + password_data->attr_name_kobj = attr_name_kobj; + + /* Populate Password attributes */ + hp_populate_password_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + hp_friendly_user_name_update(password_data->common.path, + attr_name_kobj->name, + password_data->common.display_name, + sizeof(password_data->common.display_name)); + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + return sysfs_create_group(attr_name_kobj, &password_attr_group); + + return sysfs_create_group(attr_name_kobj, &password_attr_group); +} + +/** + * hp_exit_password_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_exit_password_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.password_instances_count; + instance_id++) { + struct kobject *attr_name_kobj = + bioscfg_drv.password_data[instance_id].attr_name_kobj; + + if (attr_name_kobj) { + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + sysfs_remove_group(attr_name_kobj, + &password_attr_group); + else + sysfs_remove_group(attr_name_kobj, + &password_attr_group); + } + } + bioscfg_drv.password_instances_count = 0; + kfree(bioscfg_drv.password_data); + bioscfg_drv.password_data = NULL; +} -- 2.34.1