1 /* $OpenBSD: roaming_common.c,v 1.8 2010/01/12 00:59:29 djm Exp $ */
2 /*
3 * Copyright (c) 2004-2009 AppGate Network Security AB
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "includes.h"
19
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <sys/uio.h>
23
24 #include <errno.h>
25 #ifdef HAVE_INTTYPES_H
26 #include <inttypes.h>
27 #endif
28 #include <stdarg.h>
29 #include <string.h>
30 #include <unistd.h>
31
32 #include "atomicio.h"
33 #include "log.h"
34 #include "packet.h"
35 #include "xmalloc.h"
36 #include "cipher.h"
37 #include "buffer.h"
38 #include "roaming.h"
39
40 static size_t out_buf_size = 0;
41 static char *out_buf = NULL;
42 static size_t out_start;
43 static size_t out_last;
44
45 static u_int64_t write_bytes = 0;
46 static u_int64_t read_bytes = 0;
47
48 int roaming_enabled = 0;
49 int resume_in_progress = 0;
50
51 int
get_snd_buf_size()52 get_snd_buf_size()
53 {
54 int fd = packet_get_connection_out();
55 int optval;
56 socklen_t optvallen = sizeof(optval);
57
58 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optvallen) != 0)
59 optval = DEFAULT_ROAMBUF;
60 return optval;
61 }
62
63 int
get_recv_buf_size()64 get_recv_buf_size()
65 {
66 int fd = packet_get_connection_in();
67 int optval;
68 socklen_t optvallen = sizeof(optval);
69
70 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, &optvallen) != 0)
71 optval = DEFAULT_ROAMBUF;
72 return optval;
73 }
74
75 void
set_out_buffer_size(size_t size)76 set_out_buffer_size(size_t size)
77 {
78 /*
79 * The buffer size can only be set once and the buffer will live
80 * as long as the session lives.
81 */
82 if (out_buf == NULL) {
83 out_buf_size = size;
84 out_buf = xmalloc(size);
85 out_start = 0;
86 out_last = 0;
87 }
88 }
89
90 u_int64_t
get_recv_bytes(void)91 get_recv_bytes(void)
92 {
93 return read_bytes;
94 }
95
96 void
add_recv_bytes(u_int64_t num)97 add_recv_bytes(u_int64_t num)
98 {
99 read_bytes += num;
100 }
101
102 u_int64_t
get_sent_bytes(void)103 get_sent_bytes(void)
104 {
105 return write_bytes;
106 }
107
108 void
roam_set_bytes(u_int64_t sent,u_int64_t recvd)109 roam_set_bytes(u_int64_t sent, u_int64_t recvd)
110 {
111 read_bytes = recvd;
112 write_bytes = sent;
113 }
114
115 static void
buf_append(const char * buf,size_t count)116 buf_append(const char *buf, size_t count)
117 {
118 if (count > out_buf_size) {
119 buf += count - out_buf_size;
120 count = out_buf_size;
121 }
122 if (count < out_buf_size - out_last) {
123 memcpy(out_buf + out_last, buf, count);
124 if (out_start > out_last)
125 out_start += count;
126 out_last += count;
127 } else {
128 /* data will wrap */
129 size_t chunk = out_buf_size - out_last;
130 memcpy(out_buf + out_last, buf, chunk);
131 memcpy(out_buf, buf + chunk, count - chunk);
132 out_last = count - chunk;
133 out_start = out_last + 1;
134 }
135 }
136
137 ssize_t
roaming_write(int fd,const void * buf,size_t count,int * cont)138 roaming_write(int fd, const void *buf, size_t count, int *cont)
139 {
140 ssize_t ret;
141
142 ret = write(fd, buf, count);
143 if (ret > 0 && !resume_in_progress) {
144 write_bytes += ret;
145 if (out_buf_size > 0)
146 buf_append(buf, ret);
147 }
148 if (out_buf_size > 0 &&
149 (ret == 0 || (ret == -1 && errno == EPIPE))) {
150 if (wait_for_roaming_reconnect() != 0) {
151 ret = 0;
152 *cont = 1;
153 } else {
154 ret = -1;
155 errno = EAGAIN;
156 }
157 }
158 return ret;
159 }
160
161 ssize_t
roaming_read(int fd,void * buf,size_t count,int * cont)162 roaming_read(int fd, void *buf, size_t count, int *cont)
163 {
164 ssize_t ret = read(fd, buf, count);
165 if (ret > 0) {
166 if (!resume_in_progress) {
167 read_bytes += ret;
168 }
169 } else if (out_buf_size > 0 &&
170 (ret == 0 || (ret == -1 && (errno == ECONNRESET
171 || errno == ECONNABORTED || errno == ETIMEDOUT
172 || errno == EHOSTUNREACH)))) {
173 debug("roaming_read failed for %d ret=%ld errno=%d",
174 fd, (long)ret, errno);
175 ret = 0;
176 if (wait_for_roaming_reconnect() == 0)
177 *cont = 1;
178 }
179 return ret;
180 }
181
182 size_t
roaming_atomicio(ssize_t (* f)(int,void *,size_t),int fd,void * buf,size_t count)183 roaming_atomicio(ssize_t(*f)(int, void*, size_t), int fd, void *buf,
184 size_t count)
185 {
186 size_t ret = atomicio(f, fd, buf, count);
187
188 if (f == vwrite && ret > 0 && !resume_in_progress) {
189 write_bytes += ret;
190 } else if (f == read && ret > 0 && !resume_in_progress) {
191 read_bytes += ret;
192 }
193 return ret;
194 }
195
196 void
resend_bytes(int fd,u_int64_t * offset)197 resend_bytes(int fd, u_int64_t *offset)
198 {
199 size_t available, needed;
200
201 if (out_start < out_last)
202 available = out_last - out_start;
203 else
204 available = out_buf_size;
205 needed = write_bytes - *offset;
206 debug3("resend_bytes: resend %lu bytes from %llu",
207 (unsigned long)needed, (unsigned long long)*offset);
208 if (needed > available)
209 fatal("Needed to resend more data than in the cache");
210 if (out_last < needed) {
211 int chunkend = needed - out_last;
212 atomicio(vwrite, fd, out_buf + out_buf_size - chunkend,
213 chunkend);
214 atomicio(vwrite, fd, out_buf, out_last);
215 } else {
216 atomicio(vwrite, fd, out_buf + (out_last - needed), needed);
217 }
218 }
219
220 /*
221 * Caclulate a new key after a reconnect
222 */
223 void
calculate_new_key(u_int64_t * key,u_int64_t cookie,u_int64_t challenge)224 calculate_new_key(u_int64_t *key, u_int64_t cookie, u_int64_t challenge)
225 {
226 const EVP_MD *md = EVP_sha1();
227 EVP_MD_CTX ctx;
228 char hash[EVP_MAX_MD_SIZE];
229 Buffer b;
230
231 buffer_init(&b);
232 buffer_put_int64(&b, *key);
233 buffer_put_int64(&b, cookie);
234 buffer_put_int64(&b, challenge);
235
236 EVP_DigestInit(&ctx, md);
237 EVP_DigestUpdate(&ctx, buffer_ptr(&b), buffer_len(&b));
238 EVP_DigestFinal(&ctx, hash, NULL);
239
240 buffer_clear(&b);
241 buffer_append(&b, hash, EVP_MD_size(md));
242 *key = buffer_get_int64(&b);
243 buffer_free(&b);
244 }
245