hammer2 - error out on enc/dec errors
[dragonfly.git] / sbin / hammer2 / network.h
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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/*
88 * NOTE: HAMMER2_MSG_ALIGN (64) must be a multiple of HAMMER2_AES_KEY_SIZE.
89 */
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90#define HAMMER2_AES_KEY_SIZE 32
91#define HAMMER2_AES_KEY_MASK (HAMMER2_AES_KEY_SIZE - 1)
92#define HAMMER2_AES_TYPE aes_256_cbc
93#define HAMMER2_AES_TYPE_EVP EVP_aes_256_cbc()
94#define HAMMER2_AES_TYPE_STR #HAMMER2_AES_TYPE
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95#define HAMMER2_CRYPTO_IV_SIZE 12
96#define HAMMER2_CRYPTO_IV_FIXED_SIZE 4
97#define HAMMER2_CRYPTO_CHUNK_SIZE 64
98#define HAMMER2_CRYPTO_TAG_SIZE 16
5cf97ec5 99
62efe6ec 100/***************************************************************************
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101 * LOW LEVEL MESSAGING *
102 ***************************************************************************
103 *
104 * hammer2_msg - A standalone copy of a message, typically referenced by
105 * or embedded in other structures, or used with I/O queues.
106 *
107 * These structures are strictly temporary, so they do not have to be
108 * particularly optimized for size. All possible message headers are
109 * directly embedded (any), and the message may contain a reference
110 * to allocated auxillary data. The structure is recycled quite often
111 * by a connection.
112 *
113 * This structure is typically not used for storing persistent message
4a2e0eae 114 * state (see hammer2_persist for that).
9ab15106 115 */
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116struct hammer2_iocom;
117struct hammer2_persist;
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118struct hammer2_state;
119struct hammer2_address;
120struct hammer2_msg;
4a2e0eae 121
8c280d5d 122TAILQ_HEAD(hammer2_state_queue, hammer2_state);
78476205 123TAILQ_HEAD(hammer2_msg_queue, hammer2_msg);
8c280d5d 124TAILQ_HEAD(hammer2_address_queue, hammer2_address);
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125RB_HEAD(hammer2_state_tree, hammer2_state);
126
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127struct h2span_link;
128struct h2span_connect;
129
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130struct hammer2_state {
131 RB_ENTRY(hammer2_state) rbnode; /* indexed by msgid */
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132 TAILQ_ENTRY(hammer2_state) source_entry;/* if routed */
133 TAILQ_ENTRY(hammer2_state) target_entry;/* if routed */
4a2e0eae 134 struct hammer2_iocom *iocom;
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135 struct hammer2_address_t *source_addr; /* if routed */
136 struct hammer2_address_t *target_addr; /* if routed */
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137 uint32_t txcmd; /* mostly for CMDF flags */
138 uint32_t rxcmd; /* mostly for CMDF flags */
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139 uint64_t spanid; /* routing id */
140 uint64_t msgid; /* {spanid,msgid} uniq */
9ab15106 141 int flags;
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142 int error;
143 struct hammer2_msg *msg;
29ead430 144 void (*func)(struct hammer2_msg *);
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145 union {
146 void *any;
147 struct h2span_link *link;
148 struct h2span_connect *conn;
149 struct h2span_relay *relay;
150 } any;
151};
152
153struct hammer2_address {
154 TAILQ_ENTRY(hammer2_address) entry; /* on-iocom */
155 struct hammer2_iocom *iocom; /* related iocom */
156 struct hammer2_state_queue sourceq; /* states on source queue */
157 struct hammer2_state_queue targetq; /* states on target queue */
158 uint16_t id;
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159};
160
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161#define HAMMER2_STATE_INSERTED 0x0001
162#define HAMMER2_STATE_DYNAMIC 0x0002
8c280d5d 163#define HAMMER2_STATE_NODEID 0x0004 /* manages a node id */
9ab15106 164
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165struct hammer2_msg {
166 TAILQ_ENTRY(hammer2_msg) qentry;
29ead430 167 struct hammer2_router *router;
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168 struct hammer2_state *state;
169 size_t hdr_size;
170 size_t aux_size;
171 char *aux_data;
1b195a98 172 hammer2_msg_any_t any;
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173};
174
175typedef struct hammer2_state hammer2_state_t;
8c280d5d 176typedef struct hammer2_address hammer2_address_t;
78476205 177typedef struct hammer2_msg hammer2_msg_t;
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178typedef struct hammer2_msg_queue hammer2_msg_queue_t;
179
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180int hammer2_state_cmp(hammer2_state_t *state1, hammer2_state_t *state2);
181RB_PROTOTYPE(hammer2_state_tree, hammer2_state, rbnode, hammer2_state_cmp);
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182
183/*
184 * hammer2_ioq - An embedded component of hammer2_connect, holds state
185 * for the buffering and parsing of incoming and outgoing messages.
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186 *
187 * cdx - beg - processed buffer data, encrypted or decrypted
188 * end - cdn - unprocessed buffer data not yet encrypted or decrypted
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189 */
190struct hammer2_ioq {
191 enum { HAMMER2_MSGQ_STATE_HEADER1,
192 HAMMER2_MSGQ_STATE_HEADER2,
193 HAMMER2_MSGQ_STATE_AUXDATA1,
194 HAMMER2_MSGQ_STATE_AUXDATA2,
195 HAMMER2_MSGQ_STATE_ERROR } state;
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196 size_t fifo_beg; /* buffered data */
197 size_t fifo_cdx; /* cdx-beg processed */
198 size_t fifo_cdn; /* end-cdn unprocessed */
199 size_t fifo_end;
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200 size_t hbytes; /* header size */
201 size_t abytes; /* aux_data size */
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202 int error;
203 int seq; /* salt sequencer */
204 int msgcount;
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205 EVP_CIPHER_CTX ctx;
206 char iv[HAMMER2_AES_KEY_SIZE]; /* encrypt or decrypt iv[] */
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207 hammer2_msg_t *msg;
208 hammer2_msg_queue_t msgq;
5cf97ec5 209 char buf[HAMMER2_MSGBUF_SIZE]; /* staging buffer */
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210};
211
212typedef struct hammer2_ioq hammer2_ioq_t;
213
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214#define HAMMER2_IOQ_ERROR_SYNC 1 /* bad magic / out of sync */
215#define HAMMER2_IOQ_ERROR_EOF 2 /* unexpected EOF */
216#define HAMMER2_IOQ_ERROR_SOCK 3 /* read() error on socket */
217#define HAMMER2_IOQ_ERROR_FIELD 4 /* invalid field */
218#define HAMMER2_IOQ_ERROR_HCRC 5 /* core header crc bad */
219#define HAMMER2_IOQ_ERROR_XCRC 6 /* ext header crc bad */
220#define HAMMER2_IOQ_ERROR_ACRC 7 /* aux data crc bad */
221#define HAMMER2_IOQ_ERROR_STATE 8 /* bad state */
222#define HAMMER2_IOQ_ERROR_NOPEER 9 /* bad socket peer */
223#define HAMMER2_IOQ_ERROR_NORKEY 10 /* no remote keyfile found */
224#define HAMMER2_IOQ_ERROR_NOLKEY 11 /* no local keyfile found */
225#define HAMMER2_IOQ_ERROR_KEYXCHGFAIL 12 /* key exchange failed */
226#define HAMMER2_IOQ_ERROR_KEYFMT 13 /* key file format problem */
227#define HAMMER2_IOQ_ERROR_BADURANDOM 14 /* /dev/urandom is bad */
5cf97ec5 228#define HAMMER2_IOQ_ERROR_MSGSEQ 15 /* message sequence error */
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229#define HAMMER2_IOQ_ERROR_EALREADY 16 /* ignore this message */
230#define HAMMER2_IOQ_ERROR_TRANS 17 /* state transaction issue */
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231#define HAMMER2_IOQ_ERROR_IVWRAP 18 /* IVs exhaused */
232#define HAMMER2_IOQ_ERROR_MACFAIL 19 /* MAC of encryption algorithm failed */
233#define HAMMER2_IOQ_ERROR_ALGO 20 /* Misc. encryption algorithm error */
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234
235#define HAMMER2_IOQ_MAXIOVEC 16
236
237/*
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238 * hammer2_router - governs the routing of a message. Passed into
239 * hammer2_msg_write.
240 *
241 * The router is either connected to an iocom (socket) directly, or
242 * connected to a SPAN transaction (h2span_link structure).
243 */
244struct hammer2_router {
245 struct hammer2_iocom *iocom;
246 struct h2span_link *link; /* non-NULL if indirect */
247 void (*signal_callback)(struct hammer2_router *);
248 void (*rcvmsg_callback)(struct hammer2_msg *);
249 void (*altmsg_callback)(struct hammer2_iocom *);
250 struct hammer2_state_tree staterd_tree; /* active messages */
251 struct hammer2_state_tree statewr_tree; /* active messages */
252 hammer2_msg_queue_t txmsgq; /* tx msgq from remote */
253 int refs; /* refs prevent destruction */
254};
255
256typedef struct hammer2_router hammer2_router_t;
257
258/*
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259 * hammer2_iocom - governs a messaging stream connection
260 */
261struct hammer2_iocom {
262 hammer2_ioq_t ioq_rx;
263 hammer2_ioq_t ioq_tx;
264 hammer2_msg_queue_t freeq; /* free msgs hdr only */
265 hammer2_msg_queue_t freeq_aux; /* free msgs w/aux_data */
8c280d5d 266 struct hammer2_address_queue addrq; /* source/target addrs */
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267 int sock_fd; /* comm socket or pipe */
268 int alt_fd; /* thread signal, tty, etc */
7dc0f844 269 int wakeupfds[2]; /* pipe wakes up iocom thread */
9ab15106 270 int flags;
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271 int rxmisc;
272 int txmisc;
5cf97ec5 273 char sess[HAMMER2_AES_KEY_SIZE]; /* aes_256_cbc key */
29ead430 274 struct hammer2_router router;
7dc0f844 275 pthread_mutex_t mtx; /* mutex for state*tree/rmsgq */
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276};
277
278typedef struct hammer2_iocom hammer2_iocom_t;
279
280#define HAMMER2_IOCOMF_EOF 0x00000001 /* EOF or ERROR on desc */
281#define HAMMER2_IOCOMF_RREQ 0x00000002 /* request read-data event */
282#define HAMMER2_IOCOMF_WREQ 0x00000004 /* request write-avail event */
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283#define HAMMER2_IOCOMF_RWORK 0x00000008 /* immediate work pending */
284#define HAMMER2_IOCOMF_WWORK 0x00000010 /* immediate work pending */
285#define HAMMER2_IOCOMF_PWORK 0x00000020 /* immediate work pending */
286#define HAMMER2_IOCOMF_ARWORK 0x00000040 /* immediate work pending */
287#define HAMMER2_IOCOMF_AWWORK 0x00000080 /* immediate work pending */
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288#define HAMMER2_IOCOMF_SWORK 0x00000100 /* immediate work pending */
289#define HAMMER2_IOCOMF_CRYPTED 0x00000200 /* encrypt enabled */