u2f.h

/* vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80: */
/*
 * Copyright 2018 Red Hat, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <alloca.h>
#include <stddef.h>
#include <stdint.h>

#define U2F_KEEPALIVE_MILLIS 500

#define U2F_CID_RESERVED  0x00000000UL
#define U2F_CID_BROADCAST 0xffffffffUL

#define U2F_CMD           ((uint8_t) (1 << 7))
#define U2F_CMD_PING      (U2F_CMD | 0x01)
#define U2F_CMD_KEEPALIVE (U2F_CMD | 0x02)
#define U2F_CMD_MSG       (U2F_CMD | 0x03)
#define U2F_CMD_LOCK      (U2F_CMD | 0x04)
#define U2F_CMD_INIT      (U2F_CMD | 0x06)
#define U2F_CMD_WINK      (U2F_CMD | 0x08)
#define U2F_CMD_SYNC      (U2F_CMD | 0x3c)
#define U2F_CMD_ERROR     (U2F_CMD | 0x3f)

#define U2F_KA_PROCESSING 0x01
#define U2F_KA_TUP_NEEDED 0x02

#define U2F_ERR_SUCCESS       0x00
#define U2F_ERR_INVALID_CMD   0x01
#define U2F_ERR_INVALID_PAR   0x02
#define U2F_ERR_INVALID_LEN   0x03
#define U2F_ERR_INVALID_SEQ   0x04
#define U2F_ERR_MSG_TIMEOUT   0x05
#define U2F_ERR_CHANNEL_BUSY  0x06
#define U2F_ERR_LOCK_REQUIRED 0x0a
#define U2F_ERR_INVALID_CID   0x0b
#define U2F_ERR_OTHER         0x7f

typedef struct __attribute__((packed)) {
    uint8_t  cmd;
    uint16_t len;
    uint8_t  buf[];
} u2f_cmd;

typedef struct __attribute__((packed)) {
    uint8_t  seq;
    uint8_t  buf[];
} u2f_seq;

typedef union __attribute__((packed)) {
    u2f_cmd cmd;
    u2f_seq seq;
} u2f_pkt;

typedef struct __attribute__((packed)) {
    uint32_t cid;
    u2f_pkt  pkt;
} u2f_frm;

typedef struct __attribute__((packed)) {
    uint64_t non;
} u2f_cmd_req_init;

typedef struct __attribute__((packed)) {
    uint64_t non;
    uint32_t cid;
    uint8_t  ver;
    uint8_t  maj;
    uint8_t  min;
    uint8_t  bld;
    uint8_t  cap;
} u2f_cmd_rep_init;

void
u2f_cmd_dump(const u2f_cmd *cmd, size_t len, const char *prfx, ...);

void
u2f_seq_dump(const u2f_seq *seq, size_t len, const char *prfx, ...);

void
u2f_pkt_dump(const u2f_pkt *pkt, size_t len, const char *prfx, ...);

void
u2f_frm_dump(const u2f_frm *frm, size_t len, const char *prfx, ...);

u2f_cmd *
u2f_cmd_mkerr(u2f_cmd *cmd, uint8_t err);
#define u2f_cmd_mkerr(err) u2f_cmd_mkerr(alloca(sizeof(u2f_cmd) + 1), err)