Mercurial > dropbear
annotate cli-tcpfwd.c @ 258:306499676384
* add -g (dbclient) and -a (dropbear) options for allowing non-local
hosts to connect to forwarded ports. Rearranged various some of the
tcp listening code.
* changed to /* */ style brackets in svr-authpam.c
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 04 Dec 2005 16:13:11 +0000 |
| parents | 84925eceeb13 |
| children | c049490e43fe |
| rev | line source |
|---|---|
|
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1 /* |
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2 * Dropbear SSH |
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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 |
| 62 | 25 #include "includes.h" |
| 26 #include "options.h" | |
| 64 | 27 #include "dbutil.h" |
| 28 #include "tcpfwd.h" | |
| 62 | 29 #include "channel.h" |
| 64 | 30 #include "runopts.h" |
| 31 #include "session.h" | |
| 32 #include "ssh.h" | |
| 62 | 33 |
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34 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 64 | 35 static int newtcpforwarded(struct Channel * channel); |
| 36 | |
| 37 const struct ChanType cli_chan_tcpremote = { | |
| 38 1, /* sepfds */ | |
| 39 "forwarded-tcpip", | |
| 40 newtcpforwarded, | |
| 41 NULL, | |
| 42 NULL, | |
| 43 NULL | |
| 44 }; | |
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45 #endif |
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46 |
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47 #ifdef ENABLE_CLI_LOCALTCPFWD |
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48 static int cli_localtcp(unsigned int listenport, const char* remoteaddr, |
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49 unsigned int remoteport); |
| 62 | 50 static const struct ChanType cli_chan_tcplocal = { |
| 51 1, /* sepfds */ | |
| 52 "direct-tcpip", | |
| 53 NULL, | |
| 54 NULL, | |
| 64 | 55 NULL, |
| 62 | 56 NULL |
| 57 }; | |
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58 #endif |
| 62 | 59 |
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60 #ifdef ENABLE_CLI_LOCALTCPFWD |
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61 void setup_localtcp() { |
| 62 | 62 |
| 64 | 63 int ret; |
| 64 | |
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65 TRACE(("enter setup_localtcp")) |
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66 |
| 64 | 67 if (cli_opts.localfwds == NULL) { |
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68 TRACE(("cli_opts.localfwds == NULL")) |
| 64 | 69 } |
| 70 | |
| 71 while (cli_opts.localfwds != NULL) { | |
| 72 ret = cli_localtcp(cli_opts.localfwds->listenport, | |
| 73 cli_opts.localfwds->connectaddr, | |
| 74 cli_opts.localfwds->connectport); | |
| 75 if (ret == DROPBEAR_FAILURE) { | |
| 76 dropbear_log(LOG_WARNING, "Failed local port forward %d:%s:%d", | |
| 77 cli_opts.localfwds->listenport, | |
| 78 cli_opts.localfwds->connectaddr, | |
| 79 cli_opts.localfwds->connectport); | |
| 80 } | |
| 81 | |
| 82 cli_opts.localfwds = cli_opts.localfwds->next; | |
| 83 } | |
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84 TRACE(("leave setup_localtcp")) |
| 62 | 85 |
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86 } |
| 62 | 87 |
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88 static int cli_localtcp(unsigned int listenport, const char* remoteaddr, |
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89 unsigned int remoteport) { |
| 62 | 90 |
| 91 struct TCPListener* tcpinfo = NULL; | |
| 64 | 92 int ret; |
| 93 | |
| 94 TRACE(("enter cli_localtcp: %d %s %d", listenport, remoteaddr, | |
| 95 remoteport)); | |
| 62 | 96 |
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97 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); |
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98 |
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99 tcpinfo->sendaddr = m_strdup(remoteaddr); |
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100 tcpinfo->sendport = remoteport; |
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101 |
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102 if (opts.listen_fwd_all) { |
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103 tcpinfo->listenaddr = m_strdup(""); |
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104 } else { |
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105 tcpinfo->listenaddr = m_strdup("localhost"); |
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106 } |
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107 tcpinfo->listenport = listenport; |
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108 |
| 62 | 109 tcpinfo->chantype = &cli_chan_tcplocal; |
| 110 | |
| 111 ret = listen_tcpfwd(tcpinfo); | |
| 112 | |
| 113 if (ret == DROPBEAR_FAILURE) { | |
| 114 m_free(tcpinfo); | |
| 115 } | |
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116 TRACE(("leave cli_localtcp: %d", ret)) |
| 62 | 117 return ret; |
| 118 } | |
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119 #endif /* ENABLE_CLI_LOCALTCPFWD */ |
| 64 | 120 |
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121 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 64 | 122 static void send_msg_global_request_remotetcp(int port) { |
| 123 | |
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124 char* listenspec = NULL; |
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125 TRACE(("enter send_msg_global_request_remotetcp")) |
| 64 | 126 |
| 127 CHECKCLEARTOWRITE(); | |
| 128 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST); | |
| 129 buf_putstring(ses.writepayload, "tcpip-forward", 13); | |
| 130 buf_putbyte(ses.writepayload, 0); | |
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131 if (opts.listen_fwd_all) { |
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132 listenspec = ""; |
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133 } else { |
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134 listenspec = "localhost"; |
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135 } |
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136 /* TODO: IPv6? */; |
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137 buf_putstring(ses.writepayload, listenspec, strlen(listenspec)); |
| 64 | 138 buf_putint(ses.writepayload, port); |
| 139 | |
| 140 encrypt_packet(); | |
| 141 | |
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142 TRACE(("leave send_msg_global_request_remotetcp")) |
| 64 | 143 } |
| 144 | |
| 145 void setup_remotetcp() { | |
| 146 | |
| 147 struct TCPFwdList * iter = NULL; | |
| 148 | |
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149 TRACE(("enter setup_remotetcp")) |
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150 |
| 64 | 151 if (cli_opts.remotefwds == NULL) { |
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152 TRACE(("cli_opts.remotefwds == NULL")) |
| 64 | 153 } |
| 154 | |
| 155 iter = cli_opts.remotefwds; | |
| 156 | |
| 157 while (iter != NULL) { | |
| 158 send_msg_global_request_remotetcp(iter->listenport); | |
| 159 iter = iter->next; | |
| 160 } | |
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161 TRACE(("leave setup_remotetcp")) |
| 64 | 162 } |
| 163 | |
| 164 static int newtcpforwarded(struct Channel * channel) { | |
| 165 | |
| 166 unsigned int origport; | |
| 167 struct TCPFwdList * iter = NULL; | |
| 168 char portstring[NI_MAXSERV]; | |
| 169 int sock; | |
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170 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
| 64 | 171 |
| 172 /* We don't care what address they connected to */ | |
| 173 buf_eatstring(ses.payload); | |
| 174 | |
| 175 origport = buf_getint(ses.payload); | |
| 176 | |
| 177 /* Find which port corresponds */ | |
| 178 iter = cli_opts.remotefwds; | |
| 179 | |
| 180 while (iter != NULL) { | |
| 181 if (origport == iter->listenport) { | |
| 182 break; | |
| 183 } | |
| 184 iter = iter->next; | |
| 185 } | |
| 186 | |
| 187 if (iter == NULL) { | |
| 188 /* We didn't request forwarding on that port */ | |
| 189 dropbear_log(LOG_INFO, "Server send unrequested port, from port %d", | |
| 190 origport); | |
| 191 goto out; | |
| 192 } | |
| 193 | |
| 194 snprintf(portstring, sizeof(portstring), "%d", iter->connectport); | |
| 195 sock = connect_remote(iter->connectaddr, portstring, 1, NULL); | |
| 196 if (sock < 0) { | |
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197 TRACE(("leave newtcpdirect: sock failed")) |
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198 err = SSH_OPEN_CONNECT_FAILED; |
| 64 | 199 goto out; |
| 200 } | |
| 201 | |
| 202 ses.maxfd = MAX(ses.maxfd, sock); | |
| 203 | |
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204 /* We don't set readfd, that will get set after the connection's |
| 64 | 205 * progress succeeds */ |
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206 channel->writefd = sock; |
| 64 | 207 channel->initconn = 1; |
| 208 | |
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209 err = SSH_OPEN_IN_PROGRESS; |
| 64 | 210 |
| 211 out: | |
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212 TRACE(("leave newtcpdirect: err %d", err)) |
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213 return err; |
| 64 | 214 } |
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215 #endif /* ENABLE_CLI_REMOTETCPFWD */ |