1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2018 Roy Marples <roy@marples.name> 4 * All rights reserved 5 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef AUTH_H 29 #define AUTH_H 30 31 #include "config.h" 32 33 #ifdef HAVE_SYS_QUEUE_H 34 #include <sys/queue.h> 35 #endif 36 37 #define DHCPCD_AUTH_SEND (1 << 0) 38 #define DHCPCD_AUTH_REQUIRE (1 << 1) 39 #define DHCPCD_AUTH_RDM_COUNTER (1 << 2) 40 41 #define DHCPCD_AUTH_SENDREQUIRE (DHCPCD_AUTH_SEND | DHCPCD_AUTH_REQUIRE) 42 43 #define AUTH_PROTO_TOKEN 0 44 #define AUTH_PROTO_DELAYED 1 45 #define AUTH_PROTO_DELAYEDREALM 2 46 #define AUTH_PROTO_RECONFKEY 3 47 48 #define AUTH_ALG_NONE 0 49 #define AUTH_ALG_HMAC_MD5 1 50 51 #define AUTH_RDM_MONOTONIC 0 52 53 struct token { 54 TAILQ_ENTRY(token) next; 55 uint32_t secretid; 56 size_t realm_len; 57 unsigned char *realm; 58 size_t key_len; 59 unsigned char *key; 60 time_t expire; 61 }; 62 63 TAILQ_HEAD(token_head, token); 64 65 struct auth { 66 int options; 67 #ifdef AUTH 68 uint8_t protocol; 69 uint8_t algorithm; 70 uint8_t rdm; 71 uint64_t last_replay; 72 uint8_t last_replay_set; 73 struct token_head tokens; 74 uint32_t token_snd_secretid; 75 uint32_t token_rcv_secretid; 76 #endif 77 }; 78 79 struct authstate { 80 uint64_t replay; 81 struct token *token; 82 struct token *reconf; 83 }; 84 85 void dhcp_auth_reset(struct authstate *); 86 87 const struct token * dhcp_auth_validate(struct authstate *, 88 const struct auth *, 89 const void *, size_t, int, int, 90 const void *, size_t); 91 92 ssize_t dhcp_auth_encode(struct auth *, const struct token *, 93 void *, size_t, int, int, 94 void *, size_t); 95 #endif 96