Tony Arcieri
128 lines
4.6 KiB
Rust
128 lines
4.6 KiB
Rust
//! YubiKey Configuration Values
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// Adapted from yubico-piv-tool:
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// <https://github.com/Yubico/yubico-piv-tool/>
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//
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// Copyright (c) 2014-2016 Yubico AB
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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use crate::{consts::*, error::Error, metadata, mgm::MgmType, yubikey::YubiKey};
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use log::error;
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use std::convert::TryInto;
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/// Config
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#[derive(Copy, Clone)]
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pub struct Config {
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/// Protected data available
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protected_data_available: bool,
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/// PUK blocked
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puk_blocked: bool,
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/// No block on upgrade
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puk_noblock_on_upgrade: bool,
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/// PIN last changed
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pin_last_changed: u32,
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/// MGM type
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mgm_type: MgmType,
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}
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impl Config {
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/// Get YubiKey config
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pub fn get(yubikey: &mut YubiKey) -> Result<Config, Error> {
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let mut config = Config {
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protected_data_available: false,
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puk_blocked: false,
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puk_noblock_on_upgrade: false,
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pin_last_changed: 0,
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mgm_type: MgmType::Manual,
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};
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let txn = yubikey.begin_transaction()?;
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if let Ok(data) = metadata::read(&txn, TAG_ADMIN) {
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if let Ok(item) = metadata::get_item(&data, TAG_ADMIN_FLAGS_1) {
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if item.is_empty() {
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error!("empty response for admin flags metadata item! ignoring");
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} else {
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if item[0] & ADMIN_FLAGS_1_PUK_BLOCKED != 0 {
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config.puk_blocked = true;
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}
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if item[0] & ADMIN_FLAGS_1_PROTECTED_MGM != 0 {
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config.mgm_type = MgmType::Protected;
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}
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}
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}
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if metadata::get_item(&data, TAG_ADMIN_SALT).is_ok() {
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if config.mgm_type != MgmType::Manual {
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error!("conflicting types of MGM key administration configured");
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} else {
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config.mgm_type = MgmType::Derived;
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}
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}
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if let Ok(item) = metadata::get_item(&data, TAG_ADMIN_TIMESTAMP) {
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if item.len() != CB_ADMIN_TIMESTAMP {
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error!("pin timestamp in admin metadata is an invalid size");
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} else {
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// TODO(tarcieri): double check this is little endian
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config.pin_last_changed = u32::from_le_bytes(item.try_into().unwrap());
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}
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}
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}
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if let Ok(data) = metadata::read(&txn, TAG_PROTECTED) {
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config.protected_data_available = true;
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if let Ok(item) = metadata::get_item(&data, TAG_PROTECTED_FLAGS_1) {
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if item.is_empty() {
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error!("empty response for protected flags metadata item! ignoring");
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} else if item[0] & PROTECTED_FLAGS_1_PUK_NOBLOCK != 0 {
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config.puk_noblock_on_upgrade = true;
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}
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}
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if metadata::get_item(&data, TAG_PROTECTED_MGM).is_ok() {
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if config.mgm_type != MgmType::Protected {
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error!(
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"conflicting types of mgm key administration configured: protected MGM exists"
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);
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}
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// Always favor protected MGM
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config.mgm_type = MgmType::Protected;
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}
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}
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Ok(config)
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}
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}
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