Carl Wallace
121 lines
4.7 KiB
Rust
121 lines
4.7 KiB
Rust
//! Cardholder Unique Identifier (CHUID) Support
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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, yubikey::YubiKey};
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use getrandom::getrandom;
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/// Cardholder Unique Identifier (CHUID) Template
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///
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/// Format defined in SP-800-73-4, Appendix A, Table 9
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///
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/// FASC-N containing S9999F9999F999999F0F1F0000000000300001E encoded in
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/// 4-bit BCD with 1 bit parity. run through the tools/fasc.pl script to get
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/// bytes. This CHUID has an expiry of 2030-01-01.
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///
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/// Defined fields:
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///
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/// - 0x30: FASC-N (hard-coded)
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/// - 0x34: Card UUID / GUID (settable)
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/// - 0x35: Exp. Date (hard-coded)
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/// - 0x3e: Signature (hard-coded, empty)
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/// - 0xfe: Error Detection Code (hard-coded)
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const CHUID_TMPL: &[u8] = &[
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0x30, 0x19, 0xd4, 0xe7, 0x39, 0xda, 0x73, 0x9c, 0xed, 0x39, 0xce, 0x73, 0x9d, 0x83, 0x68, 0x58,
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0x21, 0x08, 0x42, 0x10, 0x84, 0x21, 0xc8, 0x42, 0x10, 0xc3, 0xeb, 0x34, 0x10, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x35, 0x08, 0x32,
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0x30, 0x33, 0x30, 0x30, 0x31, 0x30, 0x31, 0x3e, 0x00, 0xfe, 0x00,
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];
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/// Cardholder Unique Identifier (CHUID) Card UUID/GUID value
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#[derive(Copy, Clone, Debug)]
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pub struct ChuidUuid(pub [u8; YKPIV_CARDID_SIZE]);
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/// Cardholder Unique Identifier (CHUID)
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#[derive(Copy, Clone)]
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pub struct CHUID(pub [u8; YKPIV_CHUID_SIZE]);
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impl CHUID {
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/// Return FASC-N component of CHUID
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pub fn fascn(&self) -> Result<[u8; YKPIV_FASCN_SIZE], Error> {
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let mut fascn = [0u8; YKPIV_FASCN_SIZE];
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fascn.copy_from_slice(&self.0[CHUID_FASCN_OFFS..(CHUID_FASCN_OFFS + YKPIV_FASCN_SIZE)]);
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Ok(fascn)
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}
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/// Return Card UUID/GUID component of CHUID
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pub fn uuid(&self) -> Result<[u8; YKPIV_CARDID_SIZE], Error> {
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let mut uuid = [0u8; YKPIV_CARDID_SIZE];
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uuid.copy_from_slice(&self.0[CHUID_GUID_OFFS..(CHUID_GUID_OFFS + YKPIV_CARDID_SIZE)]);
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Ok(uuid)
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}
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/// Return expiration date component of CHUID
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pub fn expiration(&self) -> Result<[u8; YKPIV_EXPIRATION_SIZE], Error> {
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let mut expiration = [0u8; YKPIV_EXPIRATION_SIZE];
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expiration.copy_from_slice(
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&self.0[CHUID_EXPIRATION_OFFS..(CHUID_EXPIRATION_OFFS + YKPIV_EXPIRATION_SIZE)],
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);
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Ok(expiration)
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}
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/// Generate a random Cardholder Unique Identifier (CHUID)
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pub fn generate() -> Result<ChuidUuid, Error> {
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let mut id = [0u8; YKPIV_CARDID_SIZE];
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getrandom(&mut id).map_err(|_| Error::RandomnessError)?;
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Ok(ChuidUuid(id))
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}
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/// Get Cardholder Unique Identifier (CHUID)
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pub fn get(yubikey: &mut YubiKey) -> Result<CHUID, Error> {
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let txn = yubikey.begin_transaction()?;
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let response = txn.fetch_object(YKPIV_OBJ_CHUID)?;
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if response.len() != CHUID_TMPL.len() {
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return Err(Error::GenericError);
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}
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let mut chuid = [0u8; YKPIV_CHUID_SIZE];
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chuid.copy_from_slice(&response[0..YKPIV_CHUID_SIZE]);
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let retval = CHUID { 0: chuid };
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Ok(retval)
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}
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/// Set Cardholder Unique Identifier (CHUID)
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pub fn set(&self, yubikey: &mut YubiKey) -> Result<(), Error> {
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let mut buf = CHUID_TMPL.to_vec();
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buf[0..self.0.len()].copy_from_slice(&self.0);
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let txn = yubikey.begin_transaction()?;
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txn.save_object(YKPIV_OBJ_CHUID, &buf)
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}
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}
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