Mercurial > dropbear
annotate common-session.c @ 26:0969767bca0d
snapshot of stuff
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 26 Jul 2004 02:44:20 +0000 |
parents | 469950e86d0f |
children | f789045062e6 |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 #include "includes.h" |
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26 #include "session.h" |
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27 #include "dbutil.h" |
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28 #include "packet.h" |
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29 #include "algo.h" |
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30 #include "buffer.h" |
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31 #include "dss.h" |
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32 #include "ssh.h" |
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33 #include "random.h" |
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34 #include "kex.h" |
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35 #include "channel.h" |
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36 #include "atomicio.h" |
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37 |
26 | 38 |
24 | 39 struct sshsession ses; /* GLOBAL */ |
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40 |
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41 /* need to know if the session struct has been initialised, this way isn't the |
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42 * cleanest, but works OK */ |
24 | 43 int sessinitdone = 0; /* GLOBAL */ |
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44 |
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45 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */ |
24 | 46 int exitflag = 0; /* GLOBAL */ |
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47 |
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48 void(*session_remoteclosed)() = NULL; |
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49 |
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50 |
26 | 51 static void checktimeouts(); |
52 static int ident_readln(int fd, char* buf, int count); | |
53 | |
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54 /* called only at the start of a session, set up initial state */ |
26 | 55 void common_session_init(int sock, char* remotehost) { |
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56 |
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57 TRACE(("enter session_init")); |
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58 |
26 | 59 ses.remotehost = remotehost; |
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60 |
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61 ses.sock = sock; |
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62 ses.maxfd = sock; |
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63 |
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64 ses.connecttimeout = 0; |
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65 |
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66 kexinitialise(); /* initialise the kex state */ |
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67 chaninitialise(); /* initialise the channel state */ |
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68 |
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69 ses.writepayload = buf_new(MAX_TRANS_PAYLOAD_LEN); |
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70 ses.transseq = 0; |
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71 |
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72 ses.readbuf = NULL; |
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73 ses.decryptreadbuf = NULL; |
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74 ses.payload = NULL; |
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75 ses.recvseq = 0; |
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76 |
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77 ses.requirenext = SSH_MSG_KEXINIT; |
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78 ses.dataallowed = 0; /* don't send data yet, we'll wait until after kex */ |
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79 ses.ignorenext = 0; |
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80 |
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81 /* set all the algos to none */ |
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82 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context)); |
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83 ses.newkeys = NULL; |
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84 ses.keys->recv_algo_crypt = &dropbear_nocipher; |
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85 ses.keys->trans_algo_crypt = &dropbear_nocipher; |
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86 |
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87 ses.keys->recv_algo_mac = &dropbear_nohash; |
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88 ses.keys->trans_algo_mac = &dropbear_nohash; |
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89 |
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90 ses.keys->algo_kex = -1; |
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91 ses.keys->algo_hostkey = -1; |
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92 ses.keys->recv_algo_comp = DROPBEAR_COMP_NONE; |
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93 ses.keys->trans_algo_comp = DROPBEAR_COMP_NONE; |
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94 |
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95 #ifndef DISABLE_ZLIB |
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96 ses.keys->recv_zstream = NULL; |
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97 ses.keys->trans_zstream = NULL; |
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98 #endif |
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99 |
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100 /* key exchange buffers */ |
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101 ses.session_id = NULL; |
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102 ses.kexhashbuf = NULL; |
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103 ses.transkexinit = NULL; |
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104 ses.dh_K = NULL; |
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105 ses.remoteident = NULL; |
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106 |
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107 ses.authdone = 0; |
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108 |
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109 ses.chantypes = NULL; |
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110 |
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111 ses.allowprivport = 0; |
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112 |
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113 |
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114 TRACE(("leave session_init")); |
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115 } |
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116 |
26 | 117 void session_loop(void(*loophandler)()) { |
118 | |
119 fd_set readfd, writefd; | |
120 struct timeval timeout; | |
121 int val; | |
122 | |
123 /* main loop, select()s for all sockets in use */ | |
124 for(;;) { | |
125 | |
126 timeout.tv_sec = SELECT_TIMEOUT; | |
127 timeout.tv_usec = 0; | |
128 FD_ZERO(&writefd); | |
129 FD_ZERO(&readfd); | |
130 assert(ses.payload == NULL); | |
131 if (ses.sock != -1) { | |
132 FD_SET(ses.sock, &readfd); | |
133 if (!isempty(&ses.writequeue)) { | |
134 FD_SET(ses.sock, &writefd); | |
135 } | |
136 } | |
137 | |
138 /* set up for channels which require reading/writing */ | |
139 if (ses.dataallowed) { | |
140 setchannelfds(&readfd, &writefd); | |
141 } | |
142 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout); | |
143 | |
144 if (exitflag) { | |
145 dropbear_exit("Terminated by signal"); | |
146 } | |
147 | |
148 if (val < 0) { | |
149 if (errno == EINTR) { | |
150 continue; | |
151 } else { | |
152 dropbear_exit("Error in select"); | |
153 } | |
154 } | |
155 | |
156 /* check for auth timeout, rekeying required etc */ | |
157 checktimeouts(); | |
158 | |
159 if (val == 0) { | |
160 /* timeout */ | |
161 TRACE(("select timeout")); | |
162 continue; | |
163 } | |
164 | |
165 /* process session socket's incoming/outgoing data */ | |
166 if (ses.sock != -1) { | |
167 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) { | |
168 write_packet(); | |
169 } | |
170 | |
171 if (FD_ISSET(ses.sock, &readfd)) { | |
172 read_packet(); | |
173 } | |
174 | |
175 /* Process the decrypted packet. After this, the read buffer | |
176 * will be ready for a new packet */ | |
177 if (ses.payload != NULL) { | |
178 process_packet(); | |
179 } | |
180 } | |
181 | |
182 /* process pipes etc for the channels, ses.dataallowed == 0 | |
183 * during rekeying ) */ | |
184 if (ses.dataallowed) { | |
185 channelio(&readfd, &writefd); | |
186 } | |
187 | |
188 if (loophandler) { | |
189 loophandler(); | |
190 } | |
191 | |
192 } /* for(;;) */ | |
193 | |
194 /* Not reached */ | |
195 } | |
196 | |
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197 /* clean up a session on exit */ |
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198 void common_session_cleanup() { |
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199 |
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200 TRACE(("enter session_cleanup")); |
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201 |
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202 /* we can't cleanup if we don't know the session state */ |
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203 if (!sessinitdone) { |
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204 TRACE(("leave session_cleanup: !sessinitdone")); |
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205 return; |
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206 } |
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207 |
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208 m_free(ses.session_id); |
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209 m_burn(ses.keys, sizeof(struct key_context)); |
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210 m_free(ses.keys); |
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211 |
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212 chancleanup(); |
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213 |
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214 TRACE(("leave session_cleanup")); |
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215 } |
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216 |
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217 |
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218 void session_identification() { |
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219 |
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220 /* max length of 255 chars */ |
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221 char linebuf[256]; |
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222 int len = 0; |
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223 char done = 0; |
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224 |
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225 /* write our version string, this blocks */ |
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226 if (atomicio(write, ses.sock, LOCAL_IDENT "\r\n", |
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227 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) { |
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228 dropbear_exit("Error writing ident string"); |
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229 } |
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230 |
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231 len = ident_readln(ses.sock, linebuf, 256); |
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232 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) { |
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233 /* start of line matches */ |
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234 done = 1; |
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235 } |
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236 |
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237 if (!done) { |
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238 dropbear_exit("Failed to get client version"); |
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239 } else { |
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240 /* linebuf is already null terminated */ |
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241 ses.remoteident = m_malloc(len); |
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242 memcpy(ses.remoteident, linebuf, len); |
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243 } |
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244 |
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245 TRACE(("remoteident: %s", ses.remoteident)); |
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246 |
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247 } |
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248 |
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249 /* returns the length including null-terminating zero on success, |
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250 * or -1 on failure */ |
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251 static int ident_readln(int fd, char* buf, int count) { |
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252 |
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253 char in; |
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254 int pos = 0; |
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255 int num = 0; |
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256 fd_set fds; |
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257 struct timeval timeout; |
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258 |
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259 TRACE(("enter ident_readln")); |
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260 |
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261 if (count < 1) { |
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262 return -1; |
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263 } |
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264 |
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265 FD_ZERO(&fds); |
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266 |
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267 /* select since it's a non-blocking fd */ |
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268 |
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269 /* leave space to null-terminate */ |
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270 while (pos < count-1) { |
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271 |
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272 FD_SET(fd, &fds); |
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273 |
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274 timeout.tv_sec = 1; |
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275 timeout.tv_usec = 0; |
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276 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) { |
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277 if (errno == EINTR) { |
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278 continue; |
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279 } |
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280 TRACE(("leave ident_readln: select error")); |
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281 return -1; |
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282 } |
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283 |
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284 checktimeouts(); |
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285 |
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286 /* Have to go one byte at a time, since we don't want to read past |
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287 * the end, and have to somehow shove bytes back into the normal |
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288 * packet reader */ |
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289 if (FD_ISSET(fd, &fds)) { |
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290 num = read(fd, &in, 1); |
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291 /* a "\n" is a newline, "\r" we want to read in and keep going |
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292 * so that it won't be read as part of the next line */ |
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293 if (num < 0) { |
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294 /* error */ |
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295 if (errno == EINTR) { |
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296 continue; /* not a real error */ |
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297 } |
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298 TRACE(("leave ident_readln: read error")); |
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299 return -1; |
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300 } |
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301 if (num == 0) { |
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302 /* EOF */ |
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303 TRACE(("leave ident_readln: EOF")); |
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304 return -1; |
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305 } |
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306 if (in == '\n') { |
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307 /* end of ident string */ |
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308 break; |
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309 } |
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310 /* we don't want to include '\r's */ |
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311 if (in != '\r') { |
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312 buf[pos] = in; |
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313 pos++; |
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314 } |
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315 } |
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316 } |
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317 |
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318 buf[pos] = '\0'; |
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319 TRACE(("leave ident_readln: return %d", pos+1)); |
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320 return pos+1; |
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321 } |
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322 |
26 | 323 /* Check all timeouts which are required. Currently these are the time for |
324 * user authentication, and the automatic rekeying. */ | |
325 static void checktimeouts() { | |
326 | |
327 struct timeval tv; | |
328 long secs; | |
329 | |
330 if (gettimeofday(&tv, 0) < 0) { | |
331 dropbear_exit("Error getting time"); | |
332 } | |
333 | |
334 secs = tv.tv_sec; | |
335 | |
336 if (ses.connecttimeout != 0 && secs > ses.connecttimeout) { | |
337 dropbear_close("Timeout before auth"); | |
338 } | |
339 | |
340 /* we can't rekey if we haven't done remote ident exchange yet */ | |
341 if (ses.remoteident == NULL) { | |
342 return; | |
343 } | |
344 | |
345 if (!ses.kexstate.sentkexinit | |
346 && (secs - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT | |
347 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)){ | |
348 TRACE(("rekeying after timeout or max data reached")); | |
349 send_msg_kexinit(); | |
350 } | |
351 } | |
352 |