hammer2 - Flesh out span code, API cleanups
[dragonfly.git] / sbin / hammer2 / network.h
CommitLineData
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1/*
2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
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36#include <openssl/rsa.h> /* public/private key functions */
37#include <openssl/pem.h> /* public/private key file load */
38#include <openssl/err.h>
39#include <openssl/evp.h> /* aes_256_cbc functions */
40
9ab15106 41/***************************************************************************
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42 * CRYPTO HANDSHAKE *
43 ***************************************************************************
44 *
45 * The initial public-key exchange is implementing by transmitting a
46 * 512-byte buffer to the other side in a symmetrical fashion. This
47 * buffer contains the following:
48 *
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49 * (1) A random session key. 512 bits is specified. We use aes_256_cbc()
50 * and initialize the key with the first 256 bits and the iv[] with
51 * the second. Note that the transmitted and received session
52 * keys are XOR'd together to create the session key used for
53 * communications (so even if the verifier is compromised the session
54 * will still be gobbly gook if the public key has not been completely
55 * broken).
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56 *
57 * (2) A verifier to determine that the decode was successful. It encodes
58 * an XOR of each group of 4 bytes from the session key.
59 *
60 * (3) Additional configuration and additional random data.
61 *
62 * - The hammer2 message header magic for endian detect
63 *
64 * - The hammer2 protocol version. The two sides agree on the
65 * smaller of the two.
66 *
67 * - All unused fields (junk*) are filled with random data.
68 *
69 * This structure must be exactly 512 bytes and expects to use 256-byte
70 * RSA keys.
71 */
72struct hammer2_handshake {
73 char pad1[8]; /* 000 */
74 uint16_t magic; /* 008 HAMMER2_MSGHDR_MAGIC for endian detect */
75 uint16_t version; /* 00A hammer2 protocol version */
76 uint32_t flags; /* 00C protocol extension flags */
77 uint8_t sess[64]; /* 010 512-bit session key */
78 uint8_t verf[16]; /* 050 verifier = ~sess */
79 char quickmsg[32]; /* 060 reason for connecting */
80 char junk080[128]; /* 080-0FF */
81 char pad2[8]; /* 100-107 */
82 char junk100[256-8]; /* 108-1FF */
83};
84
85typedef struct hammer2_handshake hammer2_handshake_t;
86
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87#define HAMMER2_AES_KEY_SIZE 32
88#define HAMMER2_AES_KEY_MASK (HAMMER2_AES_KEY_SIZE - 1)
89#define HAMMER2_AES_TYPE aes_256_cbc
90#define HAMMER2_AES_TYPE_EVP EVP_aes_256_cbc()
91#define HAMMER2_AES_TYPE_STR #HAMMER2_AES_TYPE
92
62efe6ec 93/***************************************************************************
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94 * LOW LEVEL MESSAGING *
95 ***************************************************************************
96 *
97 * hammer2_msg - A standalone copy of a message, typically referenced by
98 * or embedded in other structures, or used with I/O queues.
99 *
100 * These structures are strictly temporary, so they do not have to be
101 * particularly optimized for size. All possible message headers are
102 * directly embedded (any), and the message may contain a reference
103 * to allocated auxillary data. The structure is recycled quite often
104 * by a connection.
105 *
106 * This structure is typically not used for storing persistent message
4a2e0eae 107 * state (see hammer2_persist for that).
9ab15106 108 */
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109struct hammer2_iocom;
110struct hammer2_persist;
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111struct hammer2_state;
112struct hammer2_address;
113struct hammer2_msg;
4a2e0eae 114
8c280d5d 115TAILQ_HEAD(hammer2_state_queue, hammer2_state);
78476205 116TAILQ_HEAD(hammer2_msg_queue, hammer2_msg);
8c280d5d 117TAILQ_HEAD(hammer2_address_queue, hammer2_address);
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118RB_HEAD(hammer2_state_tree, hammer2_state);
119
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120struct h2span_link;
121struct h2span_connect;
122
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123struct hammer2_state {
124 RB_ENTRY(hammer2_state) rbnode; /* indexed by msgid */
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125 TAILQ_ENTRY(hammer2_state) source_entry;/* if routed */
126 TAILQ_ENTRY(hammer2_state) target_entry;/* if routed */
4a2e0eae 127 struct hammer2_iocom *iocom;
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128 struct hammer2_address_t *source_addr; /* if routed */
129 struct hammer2_address_t *target_addr; /* if routed */
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130 uint32_t txcmd; /* mostly for CMDF flags */
131 uint32_t rxcmd; /* mostly for CMDF flags */
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132 uint64_t spanid; /* routing id */
133 uint64_t msgid; /* {spanid,msgid} uniq */
9ab15106 134 int flags;
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135 int error;
136 struct hammer2_msg *msg;
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137 void (*func)(struct hammer2_state *, struct hammer2_msg *);
138 union {
139 void *any;
140 struct h2span_link *link;
141 struct h2span_connect *conn;
142 struct h2span_relay *relay;
143 } any;
144};
145
146struct hammer2_address {
147 TAILQ_ENTRY(hammer2_address) entry; /* on-iocom */
148 struct hammer2_iocom *iocom; /* related iocom */
149 struct hammer2_state_queue sourceq; /* states on source queue */
150 struct hammer2_state_queue targetq; /* states on target queue */
151 uint16_t id;
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152};
153
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154#define HAMMER2_STATE_INSERTED 0x0001
155#define HAMMER2_STATE_DYNAMIC 0x0002
8c280d5d 156#define HAMMER2_STATE_NODEID 0x0004 /* manages a node id */
9ab15106 157
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158struct hammer2_msg {
159 TAILQ_ENTRY(hammer2_msg) qentry;
160 struct hammer2_state *state;
161 size_t hdr_size;
162 size_t aux_size;
163 char *aux_data;
1b195a98 164 hammer2_msg_any_t any;
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165};
166
167typedef struct hammer2_state hammer2_state_t;
8c280d5d 168typedef struct hammer2_address hammer2_address_t;
78476205 169typedef struct hammer2_msg hammer2_msg_t;
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170typedef struct hammer2_msg_queue hammer2_msg_queue_t;
171
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172int hammer2_state_cmp(hammer2_state_t *state1, hammer2_state_t *state2);
173RB_PROTOTYPE(hammer2_state_tree, hammer2_state, rbnode, hammer2_state_cmp);
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174
175/*
176 * hammer2_ioq - An embedded component of hammer2_connect, holds state
177 * for the buffering and parsing of incoming and outgoing messages.
178 */
179struct hammer2_ioq {
180 enum { HAMMER2_MSGQ_STATE_HEADER1,
181 HAMMER2_MSGQ_STATE_HEADER2,
182 HAMMER2_MSGQ_STATE_AUXDATA1,
183 HAMMER2_MSGQ_STATE_AUXDATA2,
184 HAMMER2_MSGQ_STATE_ERROR } state;
185 int fifo_beg; /* buffered data */
5cf97ec5 186 int fifo_cdx; /* encrypt/decrypt index */
9ab15106 187 int fifo_end;
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188 size_t hbytes; /* header size */
189 size_t abytes; /* aux_data size */
190 size_t already; /* aux_data already decrypted */
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191 int error;
192 int seq; /* salt sequencer */
193 int msgcount;
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194 EVP_CIPHER_CTX ctx;
195 char iv[HAMMER2_AES_KEY_SIZE]; /* encrypt or decrypt iv[] */
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196 hammer2_msg_t *msg;
197 hammer2_msg_queue_t msgq;
5cf97ec5 198 char buf[HAMMER2_MSGBUF_SIZE]; /* staging buffer */
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199};
200
201typedef struct hammer2_ioq hammer2_ioq_t;
202
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203#define HAMMER2_IOQ_ERROR_SYNC 1 /* bad magic / out of sync */
204#define HAMMER2_IOQ_ERROR_EOF 2 /* unexpected EOF */
205#define HAMMER2_IOQ_ERROR_SOCK 3 /* read() error on socket */
206#define HAMMER2_IOQ_ERROR_FIELD 4 /* invalid field */
207#define HAMMER2_IOQ_ERROR_HCRC 5 /* core header crc bad */
208#define HAMMER2_IOQ_ERROR_XCRC 6 /* ext header crc bad */
209#define HAMMER2_IOQ_ERROR_ACRC 7 /* aux data crc bad */
210#define HAMMER2_IOQ_ERROR_STATE 8 /* bad state */
211#define HAMMER2_IOQ_ERROR_NOPEER 9 /* bad socket peer */
212#define HAMMER2_IOQ_ERROR_NORKEY 10 /* no remote keyfile found */
213#define HAMMER2_IOQ_ERROR_NOLKEY 11 /* no local keyfile found */
214#define HAMMER2_IOQ_ERROR_KEYXCHGFAIL 12 /* key exchange failed */
215#define HAMMER2_IOQ_ERROR_KEYFMT 13 /* key file format problem */
216#define HAMMER2_IOQ_ERROR_BADURANDOM 14 /* /dev/urandom is bad */
5cf97ec5 217#define HAMMER2_IOQ_ERROR_MSGSEQ 15 /* message sequence error */
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218#define HAMMER2_IOQ_ERROR_EALREADY 16 /* ignore this message */
219#define HAMMER2_IOQ_ERROR_TRANS 17 /* state transaction issue */
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220
221#define HAMMER2_IOQ_MAXIOVEC 16
222
223/*
224 * hammer2_iocom - governs a messaging stream connection
225 */
226struct hammer2_iocom {
227 hammer2_ioq_t ioq_rx;
228 hammer2_ioq_t ioq_tx;
229 hammer2_msg_queue_t freeq; /* free msgs hdr only */
230 hammer2_msg_queue_t freeq_aux; /* free msgs w/aux_data */
8c280d5d 231 struct hammer2_address_queue addrq; /* source/target addrs */
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232 void (*recvmsg_callback)(struct hammer2_iocom *);
233 void (*sendmsg_callback)(struct hammer2_iocom *);
234 void (*altmsg_callback)(struct hammer2_iocom *);
235 int sock_fd; /* comm socket or pipe */
236 int alt_fd; /* thread signal, tty, etc */
237 int flags;
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238 int rxmisc;
239 int txmisc;
5cf97ec5 240 char sess[HAMMER2_AES_KEY_SIZE]; /* aes_256_cbc key */
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241 struct hammer2_state_tree staterd_tree; /* active messages */
242 struct hammer2_state_tree statewr_tree; /* active messages */
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243};
244
245typedef struct hammer2_iocom hammer2_iocom_t;
246
247#define HAMMER2_IOCOMF_EOF 0x00000001 /* EOF or ERROR on desc */
248#define HAMMER2_IOCOMF_RREQ 0x00000002 /* request read-data event */
249#define HAMMER2_IOCOMF_WREQ 0x00000004 /* request write-avail event */
250#define HAMMER2_IOCOMF_WIDLE 0x00000008 /* request write-avail event */
251#define HAMMER2_IOCOMF_SIGNAL 0x00000010
5cf97ec5 252#define HAMMER2_IOCOMF_CRYPTED 0x00000020 /* encrypt enabled */