Mercurial > dropbear
annotate svr-main.c @ 871:aa689d140928
- Sockets are set to lowdelay priority initially to improve conneciton setup
time
- Set non-pty connections to bulk for client and server
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 03 Dec 2013 00:04:48 +0800 |
parents | 220f55d540ae |
children | 860e3522f8fc |
rev | line source |
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
290 | 4 * Copyright (c) 2002-2006 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 "dbutil.h" |
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27 #include "session.h" |
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28 #include "buffer.h" |
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29 #include "signkey.h" |
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30 #include "runopts.h" |
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31 #include "dbrandom.h" |
795 | 32 #include "crypto_desc.h" |
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33 |
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34 static size_t listensockets(int *sock, size_t sockcount, int *maxfd); |
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35 static void sigchld_handler(int dummy); |
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36 static void sigsegv_handler(int); |
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37 static void sigintterm_handler(int fish); |
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38 #ifdef INETD_MODE |
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39 static void main_inetd(); |
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40 #endif |
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41 #ifdef NON_INETD_MODE |
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42 static void main_noinetd(); |
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43 #endif |
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44 static void commonsetup(); |
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45 |
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46 #if defined(DBMULTI_dropbear) || !defined(DROPBEAR_MULTI) |
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47 #if defined(DBMULTI_dropbear) && defined(DROPBEAR_MULTI) |
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48 int dropbear_main(int argc, char ** argv) |
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49 #else |
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50 int main(int argc, char ** argv) |
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51 #endif |
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52 { |
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53 _dropbear_exit = svr_dropbear_exit; |
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54 _dropbear_log = svr_dropbear_log; |
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55 |
425 | 56 disallow_core(); |
57 | |
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58 /* get commandline options */ |
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59 svr_getopts(argc, argv); |
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60 |
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61 #ifdef INETD_MODE |
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62 /* service program mode */ |
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63 if (svr_opts.inetdmode) { |
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64 main_inetd(); |
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65 /* notreached */ |
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66 } |
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67 #endif |
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68 |
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69 #ifdef NON_INETD_MODE |
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70 main_noinetd(); |
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71 /* notreached */ |
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72 #endif |
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73 |
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74 dropbear_exit("Compiled without normal mode, can't run without -i\n"); |
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75 return -1; |
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76 } |
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77 #endif |
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78 |
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79 #ifdef INETD_MODE |
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80 static void main_inetd() { |
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81 char *host, *port = NULL; |
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82 |
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83 /* Set up handlers, syslog, seed random */ |
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84 commonsetup(); |
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85 |
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86 /* In case our inetd was lax in logging source addresses */ |
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87 get_socket_address(0, NULL, NULL, &host, &port, 0); |
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88 dropbear_log(LOG_INFO, "Child connection from %s:%s", host, port); |
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89 m_free(host); |
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90 m_free(port); |
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91 |
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92 /* Don't check the return value - it may just fail since inetd has |
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93 * already done setsid() after forking (xinetd on Darwin appears to do |
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94 * this */ |
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95 setsid(); |
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96 |
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97 /* Start service program |
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98 * -1 is a dummy childpipe, just something we can close() without |
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99 * mattering. */ |
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100 svr_session(0, -1); |
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101 |
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102 /* notreached */ |
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103 } |
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104 #endif /* INETD_MODE */ |
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105 |
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106 #ifdef NON_INETD_MODE |
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107 void main_noinetd() { |
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108 fd_set fds; |
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109 unsigned int i, j; |
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110 int val; |
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111 int maxsock = -1; |
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112 int listensocks[MAX_LISTEN_ADDR]; |
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113 size_t listensockcount = 0; |
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114 FILE *pidfile = NULL; |
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115 |
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116 int childpipes[MAX_UNAUTH_CLIENTS]; |
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117 char * preauth_addrs[MAX_UNAUTH_CLIENTS]; |
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118 |
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119 int childsock; |
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120 int childpipe[2]; |
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121 |
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122 /* Note: commonsetup() must happen before we daemon()ise. Otherwise |
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123 daemon() will chdir("/"), and we won't be able to find local-dir |
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124 hostkeys. */ |
379
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125 commonsetup(); |
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126 |
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127 /* sockets to identify pre-authenticated clients */ |
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128 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) { |
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129 childpipes[i] = -1; |
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130 } |
539
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131 memset(preauth_addrs, 0x0, sizeof(preauth_addrs)); |
447
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132 |
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133 /* Set up the listening sockets */ |
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134 listensockcount = listensockets(listensocks, MAX_LISTEN_ADDR, &maxsock); |
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135 if (listensockcount == 0) |
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136 { |
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137 dropbear_exit("No listening ports available."); |
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138 } |
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139 |
871
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140 for (i = 0; i < listensockcount; i++) { |
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141 set_sock_priority(listensocks[i], DROPBEAR_PRIO_LOWDELAY); |
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142 FD_SET(listensocks[i], &fds); |
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143 } |
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144 |
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145 /* fork */ |
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146 if (svr_opts.forkbg) { |
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147 int closefds = 0; |
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148 #ifndef DEBUG_TRACE |
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149 if (!svr_opts.usingsyslog) { |
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150 closefds = 1; |
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151 } |
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152 #endif |
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153 if (daemon(0, closefds) < 0) { |
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154 dropbear_exit("Failed to daemonize: %s", strerror(errno)); |
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155 } |
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156 } |
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157 |
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158 /* should be done after syslog is working */ |
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159 if (svr_opts.forkbg) { |
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160 dropbear_log(LOG_INFO, "Running in background"); |
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161 } else { |
445
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162 dropbear_log(LOG_INFO, "Not backgrounding"); |
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163 } |
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164 |
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165 /* create a PID file so that we can be killed easily */ |
323
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166 pidfile = fopen(svr_opts.pidfile, "w"); |
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167 if (pidfile) { |
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168 fprintf(pidfile, "%d\n", getpid()); |
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169 fclose(pidfile); |
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170 } |
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171 |
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172 /* incoming connection select loop */ |
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173 for(;;) { |
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174 |
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175 FD_ZERO(&fds); |
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176 |
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177 /* listening sockets */ |
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178 for (i = 0; i < listensockcount; i++) { |
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179 FD_SET(listensocks[i], &fds); |
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180 } |
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181 |
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182 /* pre-authentication clients */ |
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183 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) { |
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184 if (childpipes[i] >= 0) { |
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185 FD_SET(childpipes[i], &fds); |
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186 maxsock = MAX(maxsock, childpipes[i]); |
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187 } |
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188 } |
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189 |
454
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190 val = select(maxsock+1, &fds, NULL, NULL, NULL); |
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191 |
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192 if (exitflag) { |
323
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193 unlink(svr_opts.pidfile); |
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194 dropbear_exit("Terminated by signal"); |
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195 } |
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196 |
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197 if (val == 0) { |
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198 /* timeout reached - shouldn't happen. eh */ |
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199 continue; |
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200 } |
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201 |
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202 if (val < 0) { |
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203 if (errno == EINTR) { |
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204 continue; |
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205 } |
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206 dropbear_exit("Listening socket error"); |
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207 } |
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208 |
277
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209 /* close fds which have been authed or closed - svr-auth.c handles |
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210 * closing the auth sockets on success */ |
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211 for (i = 0; i < MAX_UNAUTH_CLIENTS; i++) { |
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212 if (childpipes[i] >= 0 && FD_ISSET(childpipes[i], &fds)) { |
277
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213 m_close(childpipes[i]); |
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214 childpipes[i] = -1; |
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215 m_free(preauth_addrs[i]); |
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216 } |
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217 } |
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218 |
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219 /* handle each socket which has something to say */ |
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220 for (i = 0; i < listensockcount; i++) { |
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221 size_t num_unauthed_for_addr = 0; |
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222 size_t num_unauthed_total = 0; |
568
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223 char *remote_host = NULL, *remote_port = NULL; |
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224 pid_t fork_ret = 0; |
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225 size_t conn_idx = 0; |
568
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226 struct sockaddr_storage remoteaddr; |
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227 socklen_t remoteaddrlen; |
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228 |
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229 if (!FD_ISSET(listensocks[i], &fds)) |
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230 continue; |
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231 |
62 | 232 remoteaddrlen = sizeof(remoteaddr); |
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233 childsock = accept(listensocks[i], |
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234 (struct sockaddr*)&remoteaddr, &remoteaddrlen); |
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235 |
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236 if (childsock < 0) { |
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237 /* accept failed */ |
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238 continue; |
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239 } |
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240 |
277
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258
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241 /* Limit the number of unauthenticated connections per IP */ |
568
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|
242 getaddrstring(&remoteaddr, &remote_host, NULL, 0); |
277
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|
243 |
044bc108b9b3
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|
244 num_unauthed_for_addr = 0; |
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|
245 num_unauthed_total = 0; |
30
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|
246 for (j = 0; j < MAX_UNAUTH_CLIENTS; j++) { |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
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|
247 if (childpipes[j] >= 0) { |
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258
diff
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|
248 num_unauthed_total++; |
568
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|
249 if (strcmp(remote_host, preauth_addrs[j]) == 0) { |
277
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|
250 num_unauthed_for_addr++; |
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|
251 } |
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|
252 } else { |
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|
253 /* a free slot */ |
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|
254 conn_idx = j; |
30
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|
255 } |
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|
256 } |
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257 |
277
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|
258 if (num_unauthed_total >= MAX_UNAUTH_CLIENTS |
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|
259 || num_unauthed_for_addr >= MAX_UNAUTH_PER_IP) { |
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260 goto out; |
30
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|
261 } |
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262 |
687 | 263 seedrandom(); |
264 | |
30
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|
265 if (pipe(childpipe) < 0) { |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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158
diff
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|
266 TRACE(("error creating child pipe")) |
277
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267 goto out; |
30
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|
268 } |
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269 |
476
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- Rework pubkey options to be more careful about buffer lengths. Needs review.
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diff
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|
270 #ifdef DEBUG_NOFORK |
df7f7da7f6e4
- Rework pubkey options to be more careful about buffer lengths. Needs review.
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|
271 fork_ret = 0; |
df7f7da7f6e4
- Rework pubkey options to be more careful about buffer lengths. Needs review.
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454
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|
272 #else |
277
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|
273 fork_ret = fork(); |
476
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|
274 #endif |
277
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|
275 if (fork_ret < 0) { |
594
a98a2138364a
Improve capitalisation for all logged strings
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568
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|
276 dropbear_log(LOG_WARNING, "Error forking: %s", strerror(errno)); |
277
044bc108b9b3
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277 goto out; |
687 | 278 } |
277
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279 |
723 | 280 addrandom((void*)&fork_ret, sizeof(fork_ret)); |
687 | 281 |
282 if (fork_ret > 0) { | |
277
044bc108b9b3
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|
283 |
044bc108b9b3
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|
284 /* parent */ |
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|
285 childpipes[conn_idx] = childpipe[0]; |
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|
286 m_close(childpipe[1]); |
568
005530560594
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539
diff
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|
287 preauth_addrs[conn_idx] = remote_host; |
005530560594
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|
288 remote_host = NULL; |
277
044bc108b9b3
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|
289 |
044bc108b9b3
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|
290 } else { |
30
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|
291 |
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|
292 /* child */ |
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293 #ifdef DEBUG_FORKGPROF |
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|
294 extern void _start(void), etext(void); |
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|
295 monstartup((u_long)&_start, (u_long)&etext); |
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|
296 #endif /* DEBUG_FORKGPROF */ |
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297 |
568
005530560594
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539
diff
changeset
|
298 getaddrstring(&remoteaddr, NULL, &remote_port, 0); |
005530560594
Rearrange getaddrstring() etc
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539
diff
changeset
|
299 dropbear_log(LOG_INFO, "Child connection from %s:%s", remote_host, remote_port); |
005530560594
Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
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539
diff
changeset
|
300 m_free(remote_host); |
005530560594
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539
diff
changeset
|
301 m_free(remote_port); |
30
223b0f5f8dce
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|
302 |
476
df7f7da7f6e4
- Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
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454
diff
changeset
|
303 #ifndef DEBUG_NOFORK |
30
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diff
changeset
|
304 if (setsid() < 0) { |
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parents:
diff
changeset
|
305 dropbear_exit("setsid: %s", strerror(errno)); |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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|
306 } |
476
df7f7da7f6e4
- Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents:
454
diff
changeset
|
307 #endif |
30
223b0f5f8dce
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parents:
diff
changeset
|
308 |
223b0f5f8dce
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diff
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|
309 /* make sure we close sockets */ |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
changeset
|
310 for (i = 0; i < listensockcount; i++) { |
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
changeset
|
311 m_close(listensocks[i]); |
30
223b0f5f8dce
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parents:
diff
changeset
|
312 } |
223b0f5f8dce
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|
313 |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
changeset
|
314 m_close(childpipe[0]); |
30
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diff
changeset
|
315 |
223b0f5f8dce
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parents:
diff
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|
316 /* start the session */ |
568
005530560594
Rearrange getaddrstring() etc
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parents:
539
diff
changeset
|
317 svr_session(childsock, childpipe[1]); |
30
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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parents:
diff
changeset
|
318 /* don't return */ |
241
c5d3ef11155f
* use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents:
165
diff
changeset
|
319 dropbear_assert(0); |
30
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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|
320 } |
277
044bc108b9b3
* Per-IP connection unauthed connection limits
Matt Johnston <matt@ucc.asn.au>
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258
diff
changeset
|
321 |
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
changeset
|
322 out: |
044bc108b9b3
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258
diff
changeset
|
323 /* This section is important for the parent too */ |
044bc108b9b3
* Per-IP connection unauthed connection limits
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258
diff
changeset
|
324 m_close(childsock); |
568
005530560594
Rearrange getaddrstring() etc
Matt Johnston <matt@ucc.asn.au>
parents:
539
diff
changeset
|
325 if (remote_host) { |
005530560594
Rearrange getaddrstring() etc
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539
diff
changeset
|
326 m_free(remote_host); |
30
223b0f5f8dce
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parents:
diff
changeset
|
327 } |
223b0f5f8dce
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parents:
diff
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|
328 } |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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diff
changeset
|
329 } /* for(;;) loop */ |
223b0f5f8dce
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parents:
diff
changeset
|
330 |
223b0f5f8dce
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parents:
diff
changeset
|
331 /* don't reach here */ |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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diff
changeset
|
332 } |
71
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
333 #endif /* NON_INETD_MODE */ |
ac96bc733e71
adding inetd mode back from 0.43
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63
diff
changeset
|
334 |
30
223b0f5f8dce
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diff
changeset
|
335 |
223b0f5f8dce
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parents:
diff
changeset
|
336 /* catch + reap zombie children */ |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
101
diff
changeset
|
337 static void sigchld_handler(int UNUSED(unused)) { |
30
223b0f5f8dce
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diff
changeset
|
338 struct sigaction sa_chld; |
223b0f5f8dce
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diff
changeset
|
339 |
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parents:
diff
changeset
|
340 while(waitpid(-1, NULL, WNOHANG) > 0); |
223b0f5f8dce
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diff
changeset
|
341 |
223b0f5f8dce
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parents:
diff
changeset
|
342 sa_chld.sa_handler = sigchld_handler; |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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parents:
diff
changeset
|
343 sa_chld.sa_flags = SA_NOCLDSTOP; |
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parents:
diff
changeset
|
344 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) { |
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parents:
diff
changeset
|
345 dropbear_exit("signal() error"); |
223b0f5f8dce
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parents:
diff
changeset
|
346 } |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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parents:
diff
changeset
|
347 } |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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parents:
diff
changeset
|
348 |
223b0f5f8dce
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parents:
diff
changeset
|
349 /* catch any segvs */ |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
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101
diff
changeset
|
350 static void sigsegv_handler(int UNUSED(unused)) { |
30
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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diff
changeset
|
351 fprintf(stderr, "Aiee, segfault! You should probably report " |
223b0f5f8dce
Switching to the magical new Makefile, and new dbmulti style
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parents:
diff
changeset
|
352 "this as a bug to the developer\n"); |
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|
353 exit(EXIT_FAILURE); |
223b0f5f8dce
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parents:
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|
354 } |
223b0f5f8dce
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parents:
diff
changeset
|
355 |
223b0f5f8dce
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parents:
diff
changeset
|
356 /* catch ctrl-c or sigterm */ |
108
10f4d3319780
- added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
101
diff
changeset
|
357 static void sigintterm_handler(int UNUSED(unused)) { |
30
223b0f5f8dce
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parents:
diff
changeset
|
358 |
223b0f5f8dce
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parents:
diff
changeset
|
359 exitflag = 1; |
223b0f5f8dce
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parents:
diff
changeset
|
360 } |
223b0f5f8dce
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parents:
diff
changeset
|
361 |
71
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
362 /* Things used by inetd and non-inetd modes */ |
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
363 static void commonsetup() { |
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
364 |
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
365 struct sigaction sa_chld; |
ac96bc733e71
adding inetd mode back from 0.43
Matt Johnston <matt@ucc.asn.au>
parents:
63
diff
changeset
|
366 #ifndef DISABLE_SYSLOG |
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367 if (svr_opts.usingsyslog) { |
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368 startsyslog(); |
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369 } |
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370 #endif |
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371 |
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372 /* set up cleanup handler */ |
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373 if (signal(SIGINT, sigintterm_handler) == SIG_ERR || |
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374 #ifndef DEBUG_VALGRIND |
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375 signal(SIGTERM, sigintterm_handler) == SIG_ERR || |
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376 #endif |
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377 signal(SIGPIPE, SIG_IGN) == SIG_ERR) { |
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378 dropbear_exit("signal() error"); |
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379 } |
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380 |
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381 /* catch and reap zombie children */ |
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382 sa_chld.sa_handler = sigchld_handler; |
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383 sa_chld.sa_flags = SA_NOCLDSTOP; |
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384 sigemptyset(&sa_chld.sa_mask); |
71
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385 if (sigaction(SIGCHLD, &sa_chld, NULL) < 0) { |
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386 dropbear_exit("signal() error"); |
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387 } |
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388 if (signal(SIGSEGV, sigsegv_handler) == SIG_ERR) { |
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389 dropbear_exit("signal() error"); |
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390 } |
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391 |
795 | 392 crypto_init(); |
393 | |
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394 /* Now we can setup the hostkeys - needs to be after logging is on, |
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395 * otherwise we might end up blatting error messages to the socket */ |
795 | 396 load_all_hostkeys(); |
272
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397 |
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398 seedrandom(); |
71
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399 } |
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400 |
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401 /* Set up listening sockets for all the requested ports */ |
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402 static size_t listensockets(int *sock, size_t sockcount, int *maxfd) { |
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403 |
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404 unsigned int i; |
62 | 405 char* errstring = NULL; |
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406 size_t sockpos = 0; |
62 | 407 int nsock; |
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408 |
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409 TRACE(("listensockets: %d to try\n", svr_opts.portcount)) |
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410 |
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411 for (i = 0; i < svr_opts.portcount; i++) { |
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412 |
434
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413 TRACE(("listening on '%s:%s'", svr_opts.addresses[i], svr_opts.ports[i])) |
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414 |
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415 nsock = dropbear_listen(svr_opts.addresses[i], svr_opts.ports[i], &sock[sockpos], |
62 | 416 sockcount - sockpos, |
417 &errstring, maxfd); | |
418 | |
419 if (nsock < 0) { | |
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420 dropbear_log(LOG_WARNING, "Failed listening on '%s': %s", |
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421 svr_opts.ports[i], errstring); |
62 | 422 m_free(errstring); |
423 continue; | |
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424 } |
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425 |
62 | 426 sockpos += nsock; |
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427 |
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428 } |
62 | 429 return sockpos; |
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430 } |