Mercurial > dropbear
annotate svr-x11fwd.c @ 1060:4c733310c21d nocircbuffer
reword comment for clarity
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 01 Mar 2015 23:26:42 +0800 |
parents | d3925ed45a85 |
children | c45d65392c1a |
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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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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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); |
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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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diff
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|
111 int ret; |
13
db2c8e6fb284
Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
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12
diff
changeset
|
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); |
10
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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 */ |
13
db2c8e6fb284
Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
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12
diff
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|
122 if (chansess->x11singleconn) { |
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Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
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12
diff
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|
123 x11cleanup(chansess); |
10
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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
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
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62
diff
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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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changeset
|
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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changeset
|
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 |
13
db2c8e6fb284
Fixed stupid agentfwd error (using the listening FD, not the accepted on. gah)
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12
diff
changeset
|
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
b855bf63766c
Don't try to remove non-eixtant listeners
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70
diff
changeset
|
177 |
1038
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
941
diff
changeset
|
178 TRACE(("chansess %p", (void*)chansess)) |
95
b855bf63766c
Don't try to remove non-eixtant listeners
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70
diff
changeset
|
179 if (chansess->x11listener != NULL) { |
b855bf63766c
Don't try to remove non-eixtant listeners
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70
diff
changeset
|
180 remove_listener(chansess->x11listener); |
b855bf63766c
Don't try to remove non-eixtant listeners
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70
diff
changeset
|
181 chansess->x11listener = NULL; |
b855bf63766c
Don't try to remove non-eixtant listeners
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70
diff
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|
182 } |
10
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183 } |
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|
184 |
941
5daedffd0769
Set tcp priority as follows:
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723
diff
changeset
|
185 static int x11_inithandler(struct Channel *channel) { |
5daedffd0769
Set tcp priority as follows:
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|
186 channel->prio = DROPBEAR_CHANNEL_PRIO_INTERACTIVE; |
5daedffd0769
Set tcp priority as follows:
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diff
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187 return 0; |
5daedffd0769
Set tcp priority as follows:
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diff
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|
188 } |
5daedffd0769
Set tcp priority as follows:
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|
189 |
10
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diff
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|
190 static const struct ChanType chan_x11 = { |
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|
191 0, /* sepfds */ |
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diff
changeset
|
192 "x11", |
941
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|
193 x11_inithandler, /* inithandler */ |
10
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diff
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|
194 NULL, /* checkclose */ |
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diff
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|
195 NULL, /* reqhandler */ |
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parents:
diff
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|
196 NULL /* closehandler */ |
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|
197 }; |
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|
198 |
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|
199 |
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|
200 static int send_msg_channel_open_x11(int fd, struct sockaddr_in* addr) { |
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diff
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|
201 |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
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parents:
62
diff
changeset
|
202 char* ipstring = NULL; |
10
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- renaming x11fwd.c to svr-x11fwd.c, to testing monotone
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diff
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|
203 |
0f7d69d31b9d
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diff
changeset
|
204 if (send_msg_channel_open_init(fd, &chan_x11) == DROPBEAR_SUCCESS) { |
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diff
changeset
|
205 ipstring = inet_ntoa(addr->sin_addr); |
0f7d69d31b9d
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diff
changeset
|
206 buf_putstring(ses.writepayload, ipstring, strlen(ipstring)); |
0f7d69d31b9d
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diff
changeset
|
207 buf_putint(ses.writepayload, addr->sin_port); |
0f7d69d31b9d
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|
208 |
0f7d69d31b9d
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diff
changeset
|
209 encrypt_packet(); |
0f7d69d31b9d
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diff
changeset
|
210 return DROPBEAR_SUCCESS; |
0f7d69d31b9d
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diff
changeset
|
211 } else { |
0f7d69d31b9d
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
212 return DROPBEAR_FAILURE; |
0f7d69d31b9d
- renaming x11fwd.c to svr-x11fwd.c, to testing monotone
Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
213 } |
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214 |
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215 } |
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216 |
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217 /* returns the port bound to, or -1 on failure. |
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218 * Will attempt to bind to a port X11BINDBASE (6010 usually) or upwards */ |
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219 static int bindport(int fd) { |
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220 |
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221 struct sockaddr_in addr; |
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222 uint16_t port; |
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223 |
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224 memset((void*)&addr, 0x0, sizeof(addr)); |
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225 addr.sin_family = AF_INET; |
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226 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
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227 |
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228 /* if we can't find one in 2000 ports free, something's wrong */ |
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229 for (port = X11BINDBASE; port < X11BINDBASE + 2000; port++) { |
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230 addr.sin_port = htons(port); |
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231 if (bind(fd, (struct sockaddr*)&addr, |
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232 sizeof(struct sockaddr_in)) == 0) { |
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233 /* success */ |
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234 return port; |
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235 } |
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236 if (errno == EADDRINUSE) { |
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237 /* try the next port */ |
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238 continue; |
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239 } |
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240 /* otherwise it was an error we don't know about */ |
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241 dropbear_log(LOG_DEBUG, "Failed to bind x11 socket"); |
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242 break; |
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243 } |
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244 return -1; |
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245 } |
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246 #endif /* DROPBEAR_X11FWD */ |