Mercurial > dropbear
annotate svr-x11fwd.c @ 870:80af450dae76
Set IPTOS_LOWDELAY on PTY sessions only
author | Catalin Patulea <cat@vv.carleton.ca> |
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date | Mon, 02 Dec 2013 22:55:43 +0800 |
parents | 0fd32a552ea5 |
children | 5daedffd0769 |
rev | line source |
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10
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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 |
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27 #ifndef DISABLE_X11FWD |
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28 #include "x11fwd.h" |
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29 #include "session.h" |
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30 #include "ssh.h" |
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31 #include "dbutil.h" |
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32 #include "chansession.h" |
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33 #include "channel.h" |
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34 #include "packet.h" |
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35 #include "buffer.h" |
475
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* Patch from Frédéric Moulins adding options to authorized_keys.
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36 #include "auth.h" |
10
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37 |
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38 #define X11BASEPORT 6000 |
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39 #define X11BINDBASE 6010 |
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40 |
62 | 41 static void x11accept(struct Listener* listener, int sock); |
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42 static int bindport(int fd); |
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43 static int send_msg_channel_open_x11(int fd, struct sockaddr_in* addr); |
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44 |
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45 /* called as a request for a session channel, sets up listening X11 */ |
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46 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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47 int x11req(struct ChanSess * chansess) { |
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48 |
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49 int fd; |
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50 |
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51 if (!svr_pubkey_allows_x11fwd()) { |
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52 return DROPBEAR_FAILURE; |
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53 } |
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54 |
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55 /* we already have an x11 connection */ |
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56 if (chansess->x11listener != NULL) { |
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57 return DROPBEAR_FAILURE; |
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58 } |
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59 |
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* fix longstanding bug with connections being closed on failure to
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60 chansess->x11singleconn = buf_getbool(ses.payload); |
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61 chansess->x11authprot = buf_getstring(ses.payload, NULL); |
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62 chansess->x11authcookie = buf_getstring(ses.payload, NULL); |
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63 chansess->x11screennum = buf_getint(ses.payload); |
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64 |
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65 /* create listening socket */ |
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66 fd = socket(PF_INET, SOCK_STREAM, 0); |
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67 if (fd < 0) { |
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68 goto fail; |
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69 } |
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70 |
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71 /* allocate port and bind */ |
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72 chansess->x11port = bindport(fd); |
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73 if (chansess->x11port < 0) { |
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74 goto fail; |
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75 } |
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76 |
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77 /* listen */ |
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78 if (listen(fd, 20) < 0) { |
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79 goto fail; |
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80 } |
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81 |
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82 /* set non-blocking */ |
109
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merge of 50be59810e462f9f44f55e421227d6aa0b31982b
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95
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83 setnonblocking(fd); |
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84 |
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85 /* listener code will handle the socket now. |
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86 * No cleanup handler needed, since listener_remove only happens |
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87 * from our cleanup anyway */ |
62 | 88 chansess->x11listener = new_listener( &fd, 1, 0, chansess, x11accept, NULL); |
10
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89 if (chansess->x11listener == NULL) { |
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90 goto fail; |
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91 } |
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92 |
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93 return DROPBEAR_SUCCESS; |
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94 |
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95 fail: |
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96 /* cleanup */ |
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97 m_free(chansess->x11authprot); |
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98 m_free(chansess->x11authcookie); |
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99 close(fd); |
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100 |
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101 return DROPBEAR_FAILURE; |
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102 } |
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103 |
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104 /* accepts a new X11 socket */ |
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105 /* returns DROPBEAR_FAILURE or DROPBEAR_SUCCESS */ |
62 | 106 static void x11accept(struct Listener* listener, int sock) { |
10
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107 |
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108 int fd; |
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109 struct sockaddr_in addr; |
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110 int len; |
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111 int ret; |
13
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Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
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112 struct ChanSess * chansess = (struct ChanSess *)(listener->typedata); |
10
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113 |
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114 len = sizeof(addr); |
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115 |
62 | 116 fd = accept(sock, (struct sockaddr*)&addr, &len); |
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117 if (fd < 0) { |
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118 return; |
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119 } |
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120 |
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121 /* if single-connection we close it up */ |
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122 if (chansess->x11singleconn) { |
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123 x11cleanup(chansess); |
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124 } |
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125 |
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126 ret = send_msg_channel_open_x11(fd, &addr); |
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127 if (ret == DROPBEAR_FAILURE) { |
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128 close(fd); |
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129 } |
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130 } |
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131 |
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132 /* This is called after switching to the user, and sets up the xauth |
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133 * and environment variables. */ |
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134 void x11setauth(struct ChanSess *chansess) { |
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135 |
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136 char display[20]; /* space for "localhost:12345.123" */ |
70
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Merging in the changes from 0.41-0.43 main Dropbear tree
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137 FILE * authprog = NULL; |
10
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138 int val; |
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139 |
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140 if (chansess->x11listener == NULL) { |
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141 return; |
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142 } |
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143 |
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144 /* create the DISPLAY string */ |
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145 val = snprintf(display, sizeof(display), "localhost:%d.%d", |
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146 chansess->x11port - X11BASEPORT, chansess->x11screennum); |
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147 if (val < 0 || val >= (int)sizeof(display)) { |
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148 /* string was truncated */ |
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149 return; |
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150 } |
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151 |
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152 addnewvar("DISPLAY", display); |
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153 |
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154 /* create the xauth string */ |
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155 val = snprintf(display, sizeof(display), "unix:%d.%d", |
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156 chansess->x11port - X11BASEPORT, chansess->x11screennum); |
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157 if (val < 0 || val >= (int)sizeof(display)) { |
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158 /* string was truncated */ |
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159 return; |
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160 } |
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161 |
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162 /* popen is a nice function - code is strongly based on OpenSSH's */ |
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163 authprog = popen(XAUTH_COMMAND, "w"); |
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164 if (authprog) { |
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165 fprintf(authprog, "add %s %s %s\n", |
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166 display, chansess->x11authprot, chansess->x11authcookie); |
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167 pclose(authprog); |
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168 } else { |
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169 fprintf(stderr, "Failed to run %s\n", XAUTH_COMMAND); |
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170 } |
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171 } |
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172 |
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173 void x11cleanup(struct ChanSess *chansess) { |
10
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174 |
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175 m_free(chansess->x11authprot); |
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176 m_free(chansess->x11authcookie); |
95
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177 |
723 | 178 TRACE(("chansess %p", chansess)) |
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179 if (chansess->x11listener != NULL) { |
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180 remove_listener(chansess->x11listener); |
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181 chansess->x11listener = NULL; |
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182 } |
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183 } |
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184 |
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185 static const struct ChanType chan_x11 = { |
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186 0, /* sepfds */ |
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187 "x11", |
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188 NULL, /* inithandler */ |
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189 NULL, /* checkclose */ |
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190 NULL, /* reqhandler */ |
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191 NULL /* closehandler */ |
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192 }; |
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193 |
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194 |
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|
195 static int send_msg_channel_open_x11(int fd, struct sockaddr_in* addr) { |
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196 |
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197 char* ipstring = NULL; |
10
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198 |
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199 if (send_msg_channel_open_init(fd, &chan_x11) == DROPBEAR_SUCCESS) { |
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|
200 ipstring = inet_ntoa(addr->sin_addr); |
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|
201 buf_putstring(ses.writepayload, ipstring, strlen(ipstring)); |
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|
202 buf_putint(ses.writepayload, addr->sin_port); |
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203 |
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|
204 encrypt_packet(); |
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205 return DROPBEAR_SUCCESS; |
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206 } else { |
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207 return DROPBEAR_FAILURE; |
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208 } |
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209 |
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210 } |
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211 |
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|
212 /* returns the port bound to, or -1 on failure. |
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|
213 * Will attempt to bind to a port X11BINDBASE (6010 usually) or upwards */ |
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214 static int bindport(int fd) { |
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215 |
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216 struct sockaddr_in addr; |
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217 uint16_t port; |
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218 |
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219 memset((void*)&addr, 0x0, sizeof(addr)); |
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220 addr.sin_family = AF_INET; |
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221 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
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222 |
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223 /* if we can't find one in 2000 ports free, something's wrong */ |
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224 for (port = X11BINDBASE; port < X11BINDBASE + 2000; port++) { |
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225 addr.sin_port = htons(port); |
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226 if (bind(fd, (struct sockaddr*)&addr, |
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227 sizeof(struct sockaddr_in)) == 0) { |
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228 /* success */ |
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229 return port; |
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230 } |
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231 if (errno == EADDRINUSE) { |
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232 /* try the next port */ |
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233 continue; |
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234 } |
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235 /* otherwise it was an error we don't know about */ |
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236 dropbear_log(LOG_DEBUG, "Failed to bind x11 socket"); |
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237 break; |
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238 } |
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239 return -1; |
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240 } |
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241 #endif /* DROPBEAR_X11FWD */ |