1 #ifndef TINC_SPTPS_H 2 #define TINC_SPTPS_H 3 4 /* 5 sptps.h -- Simple Peer-to-Peer Security 6 Copyright (C) 2011-2014 Guus Sliepen <guus@tinc-vpn.org> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License along 19 with this program; if not, write to the Free Software Foundation, Inc., 20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 21 */ 22 23 #include "system.h" 24 25 #include "chacha-poly1305/chacha-poly1305.h" 26 #include "ecdh.h" 27 #include "ecdsa.h" 28 29 #define SPTPS_VERSION 0 30 31 // Record types 32 #define SPTPS_HANDSHAKE 128 // Key exchange and authentication 33 #define SPTPS_ALERT 129 // Warning or error messages 34 #define SPTPS_CLOSE 130 // Application closed the connection 35 36 // Key exchange states 37 #define SPTPS_KEX 1 // Waiting for the first Key EXchange record 38 #define SPTPS_SECONDARY_KEX 2 // Ready to receive a secondary Key EXchange record 39 #define SPTPS_SIG 3 // Waiting for a SIGnature record 40 #define SPTPS_ACK 4 // Waiting for an ACKnowledgement record 41 42 // Overhead for datagrams 43 #define SPTPS_DATAGRAM_OVERHEAD 21 44 45 typedef bool (*send_data_t)(void *handle, uint8_t type, const void *data, size_t len); 46 typedef bool (*receive_record_t)(void *handle, uint8_t type, const void *data, uint16_t len); 47 48 typedef struct sptps { 49 bool initiator; 50 bool datagram; 51 int state; 52 53 char *inbuf; 54 size_t buflen; 55 uint16_t reclen; 56 57 bool instate; 58 chacha_poly1305_ctx_t *incipher; 59 uint32_t inseqno; 60 uint32_t received; 61 unsigned int replaywin; 62 unsigned int farfuture; 63 char *late; 64 65 bool outstate; 66 chacha_poly1305_ctx_t *outcipher; 67 uint32_t outseqno; 68 69 ecdsa_t *mykey; 70 ecdsa_t *hiskey; 71 ecdh_t *ecdh; 72 73 char *mykex; 74 char *hiskex; 75 char *key; 76 char *label; 77 size_t labellen; 78 79 void *handle; 80 send_data_t send_data; 81 receive_record_t receive_record; 82 } sptps_t; 83 84 extern unsigned int sptps_replaywin; 85 extern void sptps_log_quiet(sptps_t *s, int s_errno, const char *format, va_list ap); 86 extern void sptps_log_stderr(sptps_t *s, int s_errno, const char *format, va_list ap); 87 extern void (*sptps_log)(sptps_t *s, int s_errno, const char *format, va_list ap); 88 extern bool sptps_start(sptps_t *s, void *handle, bool initiator, bool datagram, ecdsa_t *mykey, ecdsa_t *hiskey, const void *label, size_t labellen, send_data_t send_data, receive_record_t receive_record); 89 extern bool sptps_stop(sptps_t *s); 90 extern bool sptps_send_record(sptps_t *s, uint8_t type, const void *data, uint16_t len); 91 extern size_t sptps_receive_data(sptps_t *s, const void *data, size_t len); 92 extern bool sptps_force_kex(sptps_t *s); 93 extern bool sptps_verify_datagram(sptps_t *s, const void *data, size_t len); 94 95 #endif 96