annotate common-session.c @ 925:bae0b34bc059 pam

Better PAM through recursion
author Matt Johnston <matt@ucc.asn.au>
date Wed, 12 Mar 2014 23:40:02 +0800
parents a1a97e98b0c1
children 73ea0dce9a57
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "session.h"
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27 #include "dbutil.h"
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28 #include "packet.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "dss.h"
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32 #include "ssh.h"
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33 #include "dbrandom.h"
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34 #include "kex.h"
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35 #include "channel.h"
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36 #include "runopts.h"
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37
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38 static void checktimeouts();
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39 static long select_timeout();
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40 static int ident_readln(int fd, char* buf, int count);
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41 static void read_session_identification();
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42
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43 struct sshsession ses; /* GLOBAL */
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45 /* need to know if the session struct has been initialised, this way isn't the
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46 * cleanest, but works OK */
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47 int sessinitdone = 0; /* GLOBAL */
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49 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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50 int exitflag = 0; /* GLOBAL */
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51
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52 /* called only at the start of a session, set up initial state */
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53 void common_session_init(int sock_in, int sock_out) {
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55 TRACE(("enter session_init"))
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57 ses.sock_in = sock_in;
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58 ses.sock_out = sock_out;
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59 ses.maxfd = MAX(sock_in, sock_out);
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61 ses.connect_time = 0;
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62 ses.last_trx_packet_time = 0;
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63 ses.last_packet_time = 0;
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64
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65 if (pipe(ses.signal_pipe) < 0) {
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66 dropbear_exit("Signal pipe failed");
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67 }
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68 setnonblocking(ses.signal_pipe[0]);
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69 setnonblocking(ses.signal_pipe[1]);
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71 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[0]);
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72 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[1]);
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73
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74 kexfirstinitialise(); /* initialise the kex state */
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76 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN);
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77 ses.transseq = 0;
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78
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79 ses.readbuf = NULL;
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80 ses.payload = NULL;
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81 ses.recvseq = 0;
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82
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83 initqueue(&ses.writequeue);
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84
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85 ses.requirenext = SSH_MSG_KEXINIT;
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86 ses.dataallowed = 1; /* we can send data until we actually
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87 send the SSH_MSG_KEXINIT */
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88 ses.ignorenext = 0;
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89 ses.lastpacket = 0;
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90 ses.reply_queue_head = NULL;
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91 ses.reply_queue_tail = NULL;
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93 /* set all the algos to none */
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94 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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95 ses.newkeys = NULL;
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96 ses.keys->recv.algo_crypt = &dropbear_nocipher;
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97 ses.keys->trans.algo_crypt = &dropbear_nocipher;
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98 ses.keys->recv.crypt_mode = &dropbear_mode_none;
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99 ses.keys->trans.crypt_mode = &dropbear_mode_none;
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101 ses.keys->recv.algo_mac = &dropbear_nohash;
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102 ses.keys->trans.algo_mac = &dropbear_nohash;
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103
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104 ses.keys->algo_kex = NULL;
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105 ses.keys->algo_hostkey = -1;
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106 ses.keys->recv.algo_comp = DROPBEAR_COMP_NONE;
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107 ses.keys->trans.algo_comp = DROPBEAR_COMP_NONE;
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108
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109 #ifndef DISABLE_ZLIB
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110 ses.keys->recv.zstream = NULL;
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111 ses.keys->trans.zstream = NULL;
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112 #endif
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113
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114 /* key exchange buffers */
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115 ses.session_id = NULL;
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116 ses.kexhashbuf = NULL;
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117 ses.transkexinit = NULL;
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118 ses.dh_K = NULL;
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119 ses.remoteident = NULL;
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120
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121 ses.chantypes = NULL;
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122
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123 ses.allowprivport = 0;
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124
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125 TRACE(("leave session_init"))
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126 }
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127
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128 void session_loop() {
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129
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130 fd_set readfd, writefd;
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131 struct timeval timeout;
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132 int val;
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133
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134 assert(ses.recursion_count <= 1);
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135 ses.recursion_count++;
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136
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137 /* main loop, select()s for all sockets in use */
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138 while (!ses.exit_recursion) {
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139
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140 timeout.tv_sec = select_timeout();
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141 timeout.tv_usec = 0;
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142 FD_ZERO(&writefd);
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143 FD_ZERO(&readfd);
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144 dropbear_assert(ses.payload == NULL);
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145
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diff changeset
146 /* during initial setup we flush out the KEXINIT packet before
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diff changeset
147 * attempting to read the remote version string, which might block */
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diff changeset
148 if (ses.sock_in != -1 && (ses.remoteident || isempty(&ses.writequeue))) {
479
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diff changeset
149 FD_SET(ses.sock_in, &readfd);
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diff changeset
150 }
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
151 if (ses.sock_out != -1 && !isempty(&ses.writequeue)) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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diff changeset
152 FD_SET(ses.sock_out, &writefd);
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153 }
416
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diff changeset
154
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
155 /* We get woken up when signal handlers write to this pipe.
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diff changeset
156 SIGCHLD in svr-chansession is the only one currently. */
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diff changeset
157 FD_SET(ses.signal_pipe[0], &readfd);
26
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diff changeset
158
896
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diff changeset
159 /* set up for channels which can be read/written */
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diff changeset
160 setchannelfds(&readfd, &writefd);
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diff changeset
161
26
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diff changeset
162 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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diff changeset
163
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diff changeset
164 if (exitflag) {
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diff changeset
165 dropbear_exit("Terminated by signal");
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diff changeset
166 }
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diff changeset
167
373
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
168 if (val < 0 && errno != EINTR) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
169 dropbear_exit("Error in select");
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
170 }
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
171
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
Matt Johnston <matt@ucc.asn.au>
parents: 344
diff changeset
172 if (val <= 0) {
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
173 /* If we were interrupted or the select timed out, we still
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
Matt Johnston <matt@ucc.asn.au>
parents: 344
diff changeset
174 * want to iterate over channels etc for reading, to handle
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
Matt Johnston <matt@ucc.asn.au>
parents: 344
diff changeset
175 * server processes exiting etc.
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
176 * We don't want to read/write FDs. */
70caa99bfe3a Tidy up behaviour when select() is interrupted. We follow normal
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parents: 344
diff changeset
177 FD_ZERO(&writefd);
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diff changeset
178 FD_ZERO(&readfd);
26
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179 }
416
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
180
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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diff changeset
181 /* We'll just empty out the pipe if required. We don't do
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parents: 373
diff changeset
182 any thing with the data, since the pipe's purpose is purely to
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parents: 373
diff changeset
183 wake up the select() above. */
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parents: 373
diff changeset
184 if (FD_ISSET(ses.signal_pipe[0], &readfd)) {
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parents: 373
diff changeset
185 char x;
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
186 while (read(ses.signal_pipe[0], &x, 1) > 0) {}
a01c0c8e543a Improve behaviour when flushing out after a process has exited.
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parents: 373
diff changeset
187 }
26
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diff changeset
188
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diff changeset
189 /* check for auth timeout, rekeying required etc */
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parents: 24
diff changeset
190 checktimeouts();
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parents: 24
diff changeset
191
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parents: 24
diff changeset
192 /* process session socket's incoming/outgoing data */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
193 if (ses.sock_out != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
194 if (FD_ISSET(ses.sock_out, &writefd) && !isempty(&ses.writequeue)) {
531
164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042'
Matt Johnston <matt@ucc.asn.au>
parents: 529
diff changeset
195 write_packet();
26
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diff changeset
196 }
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
197 }
26
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diff changeset
198
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
199 if (ses.sock_in != -1) {
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
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parents: 454
diff changeset
200 if (FD_ISSET(ses.sock_in, &readfd)) {
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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parents: 705
diff changeset
201 if (!ses.remoteident) {
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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parents: 705
diff changeset
202 /* blocking read of the version string */
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
203 read_session_identification();
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
204 } else {
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
205 read_packet();
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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parents: 705
diff changeset
206 }
26
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diff changeset
207 }
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parents: 24
diff changeset
208
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parents: 24
diff changeset
209 /* Process the decrypted packet. After this, the read buffer
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
210 * will be ready for a new packet */
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
211 if (ses.payload != NULL) {
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
212 process_packet();
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
213 }
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
214 }
452
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
215
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
216 /* if required, flush out any queued reply packets that
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
217 were being held up during a KEX */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue
Matt Johnston <matt@ucc.asn.au>
parents: 448
diff changeset
218 maybe_flush_reply_queue();
26
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parents: 24
diff changeset
219
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
220 /* process pipes etc for the channels, ses.dataallowed == 0
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
221 * during rekeying ) */
896
a1a97e98b0c1 Read (and enqueue) packets from interactive input even when
Matt Johnston <matt@ucc.asn.au>
parents: 891
diff changeset
222 channelio(&readfd, &writefd);
26
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parents: 24
diff changeset
223
925
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 896
diff changeset
224 if (ses.loop_handler) {
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 896
diff changeset
225 ses.loop_handler();
26
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diff changeset
226 }
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parents: 24
diff changeset
227
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
228 } /* for(;;) */
925
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 896
diff changeset
229 ses.recursion_count--;
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 896
diff changeset
230 ses.exit_recursion = 0;
26
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diff changeset
231 }
0969767bca0d snapshot of stuff
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diff changeset
232
4
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diff changeset
233 /* clean up a session on exit */
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
234 void session_cleanup() {
4
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parents:
diff changeset
235
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
236 TRACE(("enter session_cleanup"))
4
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parents:
diff changeset
237
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
238 /* we can't cleanup if we don't know the session state */
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parents:
diff changeset
239 if (!sessinitdone) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
240 TRACE(("leave session_cleanup: !sessinitdone"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 return;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 }
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
243
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
244 if (ses.extra_session_cleanup) {
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
245 ses.extra_session_cleanup();
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
diff changeset
246 }
891
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
247
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
248 chancleanup();
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
249
891
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
250 /* Cleaning up keys must happen after other cleanup
e78f5ce6e7bb cleanup before clearing keys
Matt Johnston <matt@ucc.asn.au>
parents: 886
diff changeset
251 functions which might queue packets */
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
252 if (ses.session_id) {
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
253 buf_burn(ses.session_id);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
254 buf_free(ses.session_id);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
255 ses.session_id = NULL;
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
256 }
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
257 if (ses.hash) {
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
258 buf_burn(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
259 buf_free(ses.hash);
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
260 ses.hash = NULL;
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
261 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 m_burn(ses.keys, sizeof(struct key_context));
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 m_free(ses.keys);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
265 TRACE(("leave session_cleanup"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
266 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
267
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
268 void send_session_identification() {
751
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
269 buffer *writebuf = buf_new(strlen(LOCAL_IDENT "\r\n") + 1);
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
270 buf_putbytes(writebuf, LOCAL_IDENT "\r\n", strlen(LOCAL_IDENT "\r\n"));
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
271 buf_putbyte(writebuf, 0x0); /* packet type */
751
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
272 buf_setpos(writebuf, 0);
685d05f1cc5c Just put the version string on the queue, don't use atomicio
Matt Johnston <matt@ucc.asn.au>
parents: 733
diff changeset
273 enqueue(&ses.writequeue, writebuf);
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
Matt Johnston <matt@ucc.asn.au>
parents: 705
diff changeset
274 }
4
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parents:
diff changeset
275
726
78eda530c000 send out our kexinit packet before blocking to read the SSH version string
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parents: 705
diff changeset
276 static void read_session_identification() {
4
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parents:
diff changeset
277 /* max length of 255 chars */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
278 char linebuf[256];
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
279 int len = 0;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 char done = 0;
103
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
281 int i;
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
282 /* If they send more than 50 lines, something is wrong */
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
Matt Johnston <matt@ucc.asn.au>
parents: 242
diff changeset
283 for (i = 0; i < 50; i++) {
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
284 len = ident_readln(ses.sock_in, linebuf, sizeof(linebuf));
103
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
285
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
286 if (len < 0 && errno != EINTR) {
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
287 /* It failed */
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
288 break;
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
289 }
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
290
8aeac62a968f Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents: 41
diff changeset
291 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
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parents: 41
diff changeset
292 /* start of line matches */
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diff changeset
293 done = 1;
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diff changeset
294 break;
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diff changeset
295 }
4
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296 }
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297
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298 if (!done) {
165
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diff changeset
299 TRACE(("err: %s for '%s'\n", strerror(errno), linebuf))
344
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diff changeset
300 ses.remoteclosed();
4
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301 } else {
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diff changeset
302 /* linebuf is already null terminated */
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303 ses.remoteident = m_malloc(len);
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304 memcpy(ses.remoteident, linebuf, len);
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305 }
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306
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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diff changeset
307 /* Shall assume that 2.x will be backwards compatible. */
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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diff changeset
308 if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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parents: 502
diff changeset
309 && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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parents: 502
diff changeset
310 dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
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diff changeset
311 }
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
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diff changeset
312
165
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diff changeset
313 TRACE(("remoteident: %s", ses.remoteident))
4
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314
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315 }
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316
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317 /* returns the length including null-terminating zero on success,
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318 * or -1 on failure */
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319 static int ident_readln(int fd, char* buf, int count) {
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320
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321 char in;
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322 int pos = 0;
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323 int num = 0;
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324 fd_set fds;
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325 struct timeval timeout;
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326
165
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diff changeset
327 TRACE(("enter ident_readln"))
4
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328
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329 if (count < 1) {
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330 return -1;
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331 }
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332
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333 FD_ZERO(&fds);
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334
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335 /* select since it's a non-blocking fd */
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336
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337 /* leave space to null-terminate */
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diff changeset
338 while (pos < count-1) {
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339
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340 FD_SET(fd, &fds);
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341
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diff changeset
342 timeout.tv_sec = 1;
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343 timeout.tv_usec = 0;
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344 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
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parents:
diff changeset
345 if (errno == EINTR) {
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diff changeset
346 continue;
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347 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
348 TRACE(("leave ident_readln: select error"))
4
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349 return -1;
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350 }
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351
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diff changeset
352 checktimeouts();
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353
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diff changeset
354 /* Have to go one byte at a time, since we don't want to read past
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355 * the end, and have to somehow shove bytes back into the normal
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diff changeset
356 * packet reader */
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parents:
diff changeset
357 if (FD_ISSET(fd, &fds)) {
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diff changeset
358 num = read(fd, &in, 1);
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359 /* a "\n" is a newline, "\r" we want to read in and keep going
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parents:
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360 * so that it won't be read as part of the next line */
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diff changeset
361 if (num < 0) {
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parents:
diff changeset
362 /* error */
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parents:
diff changeset
363 if (errno == EINTR) {
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diff changeset
364 continue; /* not a real error */
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diff changeset
365 }
165
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diff changeset
366 TRACE(("leave ident_readln: read error"))
4
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diff changeset
367 return -1;
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diff changeset
368 }
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369 if (num == 0) {
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370 /* EOF */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
371 TRACE(("leave ident_readln: EOF"))
4
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372 return -1;
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373 }
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374 if (in == '\n') {
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diff changeset
375 /* end of ident string */
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diff changeset
376 break;
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377 }
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378 /* we don't want to include '\r's */
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diff changeset
379 if (in != '\r') {
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diff changeset
380 buf[pos] = in;
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diff changeset
381 pos++;
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382 }
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383 }
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384 }
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385
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diff changeset
386 buf[pos] = '\0';
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 135
diff changeset
387 TRACE(("leave ident_readln: return %d", pos+1))
4
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parents:
diff changeset
388 return pos+1;
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parents:
diff changeset
389 }
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diff changeset
390
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
391 void send_msg_ignore() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
392 CHECKCLEARTOWRITE();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
393 buf_putbyte(ses.writepayload, SSH_MSG_IGNORE);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
394 buf_putstring(ses.writepayload, "", 0);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
395 encrypt_packet();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
396 }
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
397
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
398 /* Check all timeouts which are required. Currently these are the time for
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
399 * user authentication, and the automatic rekeying. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
400 static void checktimeouts() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
401
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
402 time_t now;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
403
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
404 now = time(NULL);
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
405
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
406 if (ses.connect_time != 0 && now - ses.connect_time >= AUTH_TIMEOUT) {
26
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
407 dropbear_close("Timeout before auth");
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
408 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
409
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
410 /* we can't rekey if we haven't done remote ident exchange yet */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
411 if (ses.remoteident == NULL) {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
412 return;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
413 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
414
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
415 if (!ses.kexstate.sentkexinit
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
416 && (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
417 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 135
diff changeset
418 TRACE(("rekeying after timeout or max data reached"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
419 send_msg_kexinit();
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
420 }
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
421
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
422 if (opts.keepalive_secs > 0
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
423 && now - ses.last_trx_packet_time >= opts.keepalive_secs) {
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
424 send_msg_ignore();
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
425 }
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
426
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
427 if (opts.idle_timeout_secs > 0 && ses.last_packet_time > 0
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
428 && now - ses.last_packet_time >= opts.idle_timeout_secs) {
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
429 dropbear_close("Idle timeout");
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
430 }
26
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parents: 24
diff changeset
431 }
0969767bca0d snapshot of stuff
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parents: 24
diff changeset
432
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
433 static long select_timeout() {
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
434 /* determine the minimum timeout that might be required, so
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
435 as to avoid waking when unneccessary */
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
436 long ret = LONG_MAX;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
437 if (KEX_REKEY_TIMEOUT > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
438 ret = MIN(KEX_REKEY_TIMEOUT, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
439 if (AUTH_TIMEOUT > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
440 ret = MIN(AUTH_TIMEOUT, ret);
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
441 if (opts.keepalive_secs > 0)
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
442 ret = MIN(opts.keepalive_secs, ret);
513
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
443 if (opts.idle_timeout_secs > 0)
a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents: 502
diff changeset
444 ret = MIN(opts.idle_timeout_secs, ret);
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
445 return ret;
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 452
diff changeset
446 }
482
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
447
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
448 const char* get_user_shell() {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
449 /* an empty shell should be interpreted as "/bin/sh" */
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
450 if (ses.authstate.pw_shell[0] == '\0') {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
451 return "/bin/sh";
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
452 } else {
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
453 return ses.authstate.pw_shell;
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
454 }
7ad49f34a122 - Add run_shell_command() function to run a "sh -c" command, handling
Matt Johnston <matt@ucc.asn.au>
parents: 479
diff changeset
455 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
456 void fill_passwd(const char* username) {
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
457 struct passwd *pw = NULL;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
458 if (ses.authstate.pw_name)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
459 m_free(ses.authstate.pw_name);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
460 if (ses.authstate.pw_dir)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
461 m_free(ses.authstate.pw_dir);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
462 if (ses.authstate.pw_shell)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
463 m_free(ses.authstate.pw_shell);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
464 if (ses.authstate.pw_passwd)
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
465 m_free(ses.authstate.pw_passwd);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
466
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
467 pw = getpwnam(username);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
468 if (!pw) {
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
469 return;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
470 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
471 ses.authstate.pw_uid = pw->pw_uid;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
472 ses.authstate.pw_gid = pw->pw_gid;
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
473 ses.authstate.pw_name = m_strdup(pw->pw_name);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
474 ses.authstate.pw_dir = m_strdup(pw->pw_dir);
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
475 ses.authstate.pw_shell = m_strdup(pw->pw_shell);
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
476 {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
477 char *passwd_crypt = pw->pw_passwd;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
478 #ifdef HAVE_SHADOW_H
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
479 /* get the shadow password if possible */
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
480 struct spwd *spasswd = getspnam(ses.authstate.pw_name);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
481 if (spasswd && spasswd->sp_pwdp) {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
482 passwd_crypt = spasswd->sp_pwdp;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
483 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
484 #endif
705
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
485 if (!passwd_crypt) {
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
486 /* android supposedly returns NULL */
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
487 passwd_crypt = "!!";
2e573f39b88e Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
488 }
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
489 ses.authstate.pw_passwd = m_strdup(passwd_crypt);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
490 }
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
491 }
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents: 482
diff changeset
492