1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2015 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 #define DHCPCD_AUTH_SEND (1 << 0) 34 #define DHCPCD_AUTH_REQUIRE (1 << 1) 35 #define DHCPCD_AUTH_RDM_COUNTER (1 << 2) 36 37 #define DHCPCD_AUTH_SENDREQUIRE (DHCPCD_AUTH_SEND | DHCPCD_AUTH_REQUIRE) 38 39 #define AUTH_PROTO_TOKEN 0 40 #define AUTH_PROTO_DELAYED 1 41 #define AUTH_PROTO_DELAYEDREALM 2 42 #define AUTH_PROTO_RECONFKEY 3 43 44 #define AUTH_ALG_HMAC_MD5 1 45 46 #define AUTH_RDM_MONOTONIC 0 47 48 struct token { 49 TAILQ_ENTRY(token) next; 50 uint32_t secretid; 51 size_t realm_len; 52 unsigned char *realm; 53 size_t key_len; 54 unsigned char *key; 55 time_t expire; 56 }; 57 58 TAILQ_HEAD(token_head, token); 59 60 struct auth { 61 int options; 62 uint8_t protocol; 63 uint8_t algorithm; 64 uint8_t rdm; 65 uint64_t last_replay; 66 uint8_t last_replay_set; 67 struct token_head tokens; 68 }; 69 70 struct authstate { 71 uint64_t replay; 72 struct token *token; 73 struct token *reconf; 74 }; 75 76 void dhcp_auth_reset(struct authstate *); 77 78 const struct token * dhcp_auth_validate(struct authstate *, 79 const struct auth *, 80 const uint8_t *, size_t, int, int, 81 const uint8_t *, size_t); 82 83 ssize_t dhcp_auth_encode(struct auth *, const struct token *, 84 uint8_t *, size_t, int, int, 85 uint8_t *, size_t); 86 #endif 87