Mercurial > dropbear
annotate common-session.c @ 1653:76189c9ffea2
External Public-Key Authentication API (#72)
* Implemented dynamic loading of an external plug-in shared library to delegate public key authentication
* Moved conditional compilation of the plugin infrastructure into the configure.ac script to be able to add -ldl to dropbear build only when the flag is enabled
* Added tags file to the ignore list
* Updated API to have the constructor to return function pointers in the pliugin instance. Added support for passing user name to the checkpubkey function. Added options to the session returned by the plugin and have dropbear to parse and process them
* Added -rdynamic to the linker flags when EPKA is enabled
* Changed the API to pass a previously created session to the checkPubKey function (created during preauth)
* Added documentation to the API
* Added parameter addrstring to plugin creation function
* Modified the API to retrieve the auth options. Instead of having them as field of the EPKASession struct, they are stored internally (plugin-dependent) in the plugin/session and retrieved through a pointer to a function (in the session)
* Changed option string to be a simple char * instead of unsigned char *
| author | fabriziobertocci <fabriziobertocci@gmail.com> |
|---|---|
| date | Wed, 15 May 2019 09:43:57 -0400 |
| parents | aabde6f57fce |
| children | cc0fc5131c5c |
| rev | line source |
|---|---|
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
| 1079 | 4 * Copyright (c) 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 #include "netio.h" |
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38 |
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39 static void checktimeouts(void); |
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40 static long select_timeout(void); |
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41 static int ident_readln(int fd, char* buf, int count); |
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42 static void read_session_identification(void); |
| 26 | 43 |
| 24 | 44 struct sshsession ses; /* GLOBAL */ |
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45 |
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46 /* called only at the start of a session, set up initial state */ |
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47 void common_session_init(int sock_in, int sock_out) { |
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48 time_t now; |
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49 |
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50 #if DEBUG_TRACE |
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51 debug_start_net(); |
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52 #endif |
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53 |
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54 TRACE(("enter session_init")) |
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55 |
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56 ses.sock_in = sock_in; |
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57 ses.sock_out = sock_out; |
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58 ses.maxfd = MAX(sock_in, sock_out); |
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59 |
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60 if (sock_in >= 0) { |
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61 setnonblocking(sock_in); |
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62 } |
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63 if (sock_out >= 0) { |
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64 setnonblocking(sock_out); |
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65 } |
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66 |
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67 ses.socket_prio = DROPBEAR_PRIO_DEFAULT; |
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68 /* Sets it to lowdelay */ |
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69 update_channel_prio(); |
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70 |
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71 #if !DROPBEAR_SVR_MULTIUSER |
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72 /* A sanity check to prevent an accidental configuration option |
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73 leaving multiuser systems exposed */ |
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74 errno = 0; |
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75 getuid(); |
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76 if (errno != ENOSYS) { |
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77 dropbear_exit("Non-multiuser Dropbear requires a non-multiuser kernel"); |
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78 } |
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79 #endif |
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80 |
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81 now = monotonic_now(); |
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82 ses.connect_time = now; |
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83 ses.last_packet_time_keepalive_recv = now; |
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84 ses.last_packet_time_idle = now; |
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85 ses.last_packet_time_any_sent = 0; |
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86 ses.last_packet_time_keepalive_sent = 0; |
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87 |
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88 #if DROPBEAR_FUZZ |
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89 if (!fuzz.fuzzing) |
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90 #endif |
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91 { |
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92 if (pipe(ses.signal_pipe) < 0) { |
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93 dropbear_exit("Signal pipe failed"); |
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94 } |
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95 setnonblocking(ses.signal_pipe[0]); |
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96 setnonblocking(ses.signal_pipe[1]); |
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97 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[0]); |
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98 ses.maxfd = MAX(ses.maxfd, ses.signal_pipe[1]); |
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99 } |
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100 |
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101 ses.writepayload = buf_new(TRANS_MAX_PAYLOAD_LEN); |
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102 ses.transseq = 0; |
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103 |
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104 ses.readbuf = NULL; |
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105 ses.payload = NULL; |
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106 ses.recvseq = 0; |
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107 |
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108 initqueue(&ses.writequeue); |
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109 |
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110 ses.requirenext = SSH_MSG_KEXINIT; |
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111 ses.dataallowed = 1; /* we can send data until we actually |
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112 send the SSH_MSG_KEXINIT */ |
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113 ses.ignorenext = 0; |
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114 ses.lastpacket = 0; |
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115 ses.reply_queue_head = NULL; |
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116 ses.reply_queue_tail = NULL; |
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117 |
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118 /* set all the algos to none */ |
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119 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context)); |
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120 ses.newkeys = NULL; |
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121 ses.keys->recv.algo_crypt = &dropbear_nocipher; |
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122 ses.keys->trans.algo_crypt = &dropbear_nocipher; |
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123 ses.keys->recv.crypt_mode = &dropbear_mode_none; |
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124 ses.keys->trans.crypt_mode = &dropbear_mode_none; |
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125 |
|
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126 ses.keys->recv.algo_mac = &dropbear_nohash; |
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127 ses.keys->trans.algo_mac = &dropbear_nohash; |
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128 |
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129 ses.keys->algo_kex = NULL; |
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130 ses.keys->algo_hostkey = -1; |
|
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131 ses.keys->recv.algo_comp = DROPBEAR_COMP_NONE; |
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132 ses.keys->trans.algo_comp = DROPBEAR_COMP_NONE; |
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133 |
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134 #ifndef DISABLE_ZLIB |
|
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135 ses.keys->recv.zstream = NULL; |
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136 ses.keys->trans.zstream = NULL; |
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137 #endif |
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138 |
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139 /* key exchange buffers */ |
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140 ses.session_id = NULL; |
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141 ses.kexhashbuf = NULL; |
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142 ses.transkexinit = NULL; |
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143 ses.dh_K = NULL; |
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144 ses.remoteident = NULL; |
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145 |
|
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146 ses.chantypes = NULL; |
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147 |
|
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148 ses.allowprivport = 0; |
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149 |
|
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150 #if DROPBEAR_EPKA |
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151 ses.epka_session = NULL; |
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152 #endif |
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153 |
|
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154 TRACE(("leave session_init")) |
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155 } |
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156 |
|
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157 void session_loop(void(*loophandler)(void)) { |
| 26 | 158 |
| 159 fd_set readfd, writefd; | |
| 160 struct timeval timeout; | |
| 161 int val; | |
| 162 | |
| 163 /* main loop, select()s for all sockets in use */ | |
| 164 for(;;) { | |
|
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165 const int writequeue_has_space = (ses.writequeue_len <= 2*TRANS_MAX_PAYLOAD_LEN); |
| 26 | 166 |
|
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167 timeout.tv_sec = select_timeout(); |
| 26 | 168 timeout.tv_usec = 0; |
|
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169 DROPBEAR_FD_ZERO(&writefd); |
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170 DROPBEAR_FD_ZERO(&readfd); |
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171 |
|
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172 dropbear_assert(ses.payload == NULL); |
|
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173 |
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174 /* We get woken up when signal handlers write to this pipe. |
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175 SIGCHLD in svr-chansession is the only one currently. */ |
|
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176 #if DROPBEAR_FUZZ |
| 1357 | 177 if (!fuzz.fuzzing) |
| 178 #endif | |
| 179 { | |
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180 FD_SET(ses.signal_pipe[0], &readfd); |
| 1357 | 181 } |
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182 |
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183 /* set up for channels which can be read/written */ |
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184 setchannelfds(&readfd, &writefd, writequeue_has_space); |
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185 |
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186 /* Pending connections to test */ |
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187 set_connect_fds(&writefd); |
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188 |
|
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189 /* We delay reading from the input socket during initial setup until |
|
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190 after we have written out our initial KEXINIT packet (empty writequeue). |
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191 This means our initial packet can be in-flight while we're doing a blocking |
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192 read for the remote ident. |
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193 We also avoid reading from the socket if the writequeue is full, that avoids |
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194 replies backing up */ |
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195 if (ses.sock_in != -1 |
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196 && (ses.remoteident || isempty(&ses.writequeue)) |
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197 && writequeue_has_space) { |
|
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198 FD_SET(ses.sock_in, &readfd); |
|
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199 } |
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200 |
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201 /* Ordering is important, this test must occur after any other function |
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202 might have queued packets (such as connection handlers) */ |
|
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203 if (ses.sock_out != -1 && !isempty(&ses.writequeue)) { |
|
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204 FD_SET(ses.sock_out, &writefd); |
| 26 | 205 } |
| 1025 | 206 |
| 26 | 207 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout); |
| 208 | |
|
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209 if (ses.exitflag) { |
| 26 | 210 dropbear_exit("Terminated by signal"); |
| 211 } | |
| 212 | |
|
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213 if (val < 0 && errno != EINTR) { |
|
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214 dropbear_exit("Error in select"); |
|
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215 } |
|
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216 |
|
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217 if (val <= 0) { |
|
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218 /* If we were interrupted or the select timed out, we still |
|
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219 * want to iterate over channels etc for reading, to handle |
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220 * server processes exiting etc. |
|
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221 * We don't want to read/write FDs. */ |
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222 DROPBEAR_FD_ZERO(&writefd); |
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223 DROPBEAR_FD_ZERO(&readfd); |
| 26 | 224 } |
|
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225 |
|
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226 /* We'll just empty out the pipe if required. We don't do |
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227 any thing with the data, since the pipe's purpose is purely to |
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228 wake up the select() above. */ |
|
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229 ses.channel_signal_pending = 0; |
|
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230 if (FD_ISSET(ses.signal_pipe[0], &readfd)) { |
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231 char x; |
|
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232 TRACE(("signal pipe set")) |
|
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233 while (read(ses.signal_pipe[0], &x, 1) > 0) {} |
|
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234 ses.channel_signal_pending = 1; |
|
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235 } |
| 26 | 236 |
| 237 /* check for auth timeout, rekeying required etc */ | |
| 238 checktimeouts(); | |
| 239 | |
|
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|
240 /* process session socket's incoming data */ |
|
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241 if (ses.sock_in != -1) { |
|
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242 if (FD_ISSET(ses.sock_in, &readfd)) { |
|
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243 if (!ses.remoteident) { |
|
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244 /* blocking read of the version string */ |
|
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245 read_session_identification(); |
|
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246 } else { |
|
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247 read_packet(); |
|
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248 } |
| 26 | 249 } |
| 250 | |
| 251 /* Process the decrypted packet. After this, the read buffer | |
| 252 * will be ready for a new packet */ | |
| 253 if (ses.payload != NULL) { | |
| 254 process_packet(); | |
| 255 } | |
| 256 } | |
| 1025 | 257 |
|
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4cab61369879
Prevent invalid packets being sent during key-exchange, instead queue
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258 /* if required, flush out any queued reply packets that |
|
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259 were being held up during a KEX */ |
|
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260 maybe_flush_reply_queue(); |
| 26 | 261 |
| 1025 | 262 handle_connect_fds(&writefd); |
| 263 | |
|
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264 /* loop handler prior to channelio, in case the server loophandler closes |
|
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|
265 channels on process exit */ |
|
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|
266 loophandler(); |
|
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267 |
| 26 | 268 /* process pipes etc for the channels, ses.dataallowed == 0 |
| 269 * during rekeying ) */ | |
|
896
a1a97e98b0c1
Read (and enqueue) packets from interactive input even when
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|
270 channelio(&readfd, &writefd); |
| 26 | 271 |
|
929
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272 /* process session socket's outgoing data */ |
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273 if (ses.sock_out != -1) { |
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Experiment of always writing data if available. Might waste a writev() with
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274 if (!isempty(&ses.writequeue)) { |
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|
275 write_packet(); |
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276 } |
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277 } |
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278 |
| 26 | 279 } /* for(;;) */ |
| 280 | |
| 281 /* Not reached */ | |
| 282 } | |
| 283 | |
|
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284 static void cleanup_buf(buffer **buf) { |
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285 if (!*buf) { |
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286 return; |
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287 } |
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288 buf_burn(*buf); |
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289 buf_free(*buf); |
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290 *buf = NULL; |
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291 } |
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292 |
|
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293 /* clean up a session on exit */ |
|
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|
294 void session_cleanup() { |
|
4
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295 |
|
165
0cfba3034be5
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|
296 TRACE(("enter session_cleanup")) |
|
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297 |
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298 /* we can't cleanup if we don't know the session state */ |
|
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299 if (!ses.init_done) { |
|
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300 TRACE(("leave session_cleanup: !ses.init_done")) |
|
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301 return; |
|
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|
302 } |
|
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|
303 |
| 1079 | 304 /* BEWARE of changing order of functions here. */ |
|
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|
305 |
|
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|
306 /* Must be before extra_session_cleanup() */ |
|
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|
307 chancleanup(); |
|
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|
308 |
|
733
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|
309 if (ses.extra_session_cleanup) { |
|
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|
310 ses.extra_session_cleanup(); |
|
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|
311 } |
|
891
e78f5ce6e7bb
cleanup before clearing keys
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886
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changeset
|
312 |
| 1079 | 313 /* After these are freed most functions will fail */ |
|
1295
750ec4ec4cbe
Convert #ifdef to #if, other build changes
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1292
diff
changeset
|
314 #if DROPBEAR_CLEANUP |
|
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315 /* listeners call cleanup functions, this should occur before |
|
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|
316 other session state is freed. */ |
|
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|
317 remove_all_listeners(); |
|
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|
318 |
| 1050 | 319 remove_connect_pending(); |
| 320 | |
|
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|
321 while (!isempty(&ses.writequeue)) { |
|
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|
322 buf_free(dequeue(&ses.writequeue)); |
|
761
ac2158e3e403
ecc kind of works, needs fixing/testing
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|
323 } |
|
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|
324 |
|
1358
6b89eb92f872
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|
325 m_free(ses.newkeys); |
|
6b89eb92f872
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diff
changeset
|
326 #ifndef DISABLE_ZLIB |
|
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|
327 if (ses.keys->recv.zstream != NULL) { |
|
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|
328 if (inflateEnd(ses.keys->recv.zstream) == Z_STREAM_ERROR) { |
|
6b89eb92f872
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|
329 dropbear_exit("Crypto error"); |
|
6b89eb92f872
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diff
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|
330 } |
|
6b89eb92f872
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diff
changeset
|
331 m_free(ses.keys->recv.zstream); |
|
6b89eb92f872
glaring wrapfd problems fixed
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diff
changeset
|
332 } |
|
6b89eb92f872
glaring wrapfd problems fixed
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diff
changeset
|
333 #endif |
|
6b89eb92f872
glaring wrapfd problems fixed
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diff
changeset
|
334 |
|
1040
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|
335 m_free(ses.remoteident); |
|
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Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
336 m_free(ses.authstate.pw_dir); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
337 m_free(ses.authstate.pw_name); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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1038
diff
changeset
|
338 m_free(ses.authstate.pw_shell); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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1038
diff
changeset
|
339 m_free(ses.authstate.pw_passwd); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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1038
diff
changeset
|
340 m_free(ses.authstate.username); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
341 #endif |
|
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Free memory before exiting. Based on patch from Thorsten Horstmann.
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|
342 |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
343 cleanup_buf(&ses.session_id); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
344 cleanup_buf(&ses.hash); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
345 cleanup_buf(&ses.payload); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
346 cleanup_buf(&ses.readbuf); |
|
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
changeset
|
347 cleanup_buf(&ses.writepayload); |
|
1041
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
348 cleanup_buf(&ses.kexhashbuf); |
|
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
349 cleanup_buf(&ses.transkexinit); |
|
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
350 if (ses.dh_K) { |
|
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
351 mp_clear(ses.dh_K); |
|
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
352 } |
|
3fb883a6aa81
Some additional cleanup functions
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diff
changeset
|
353 m_free(ses.dh_K); |
|
1040
2b4fd440399d
Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff
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|
354 |
|
4
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Makefile.in contains updated files required
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diff
changeset
|
355 m_burn(ses.keys, sizeof(struct key_context)); |
|
fe6bca95afa7
Makefile.in contains updated files required
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changeset
|
356 m_free(ses.keys); |
|
fe6bca95afa7
Makefile.in contains updated files required
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changeset
|
357 |
|
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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135
diff
changeset
|
358 TRACE(("leave session_cleanup")) |
|
4
fe6bca95afa7
Makefile.in contains updated files required
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changeset
|
359 } |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
360 |
|
726
78eda530c000
send out our kexinit packet before blocking to read the SSH version string
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parents:
705
diff
changeset
|
361 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
|
362 buffer *writebuf = buf_new(strlen(LOCAL_IDENT "\r\n") + 1); |
|
1094
c45d65392c1a
Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents:
1079
diff
changeset
|
363 buf_putbytes(writebuf, (const unsigned char *) LOCAL_IDENT "\r\n", strlen(LOCAL_IDENT "\r\n")); |
|
1577
399d8eb961b5
get rid of unused packet_type in encrypted write queue
Matt Johnston <matt@ucc.asn.au>
parents:
1558
diff
changeset
|
364 writebuf_enqueue(writebuf); |
|
726
78eda530c000
send out our kexinit packet before blocking to read the SSH version string
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705
diff
changeset
|
365 } |
|
4
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
366 |
|
726
78eda530c000
send out our kexinit packet before blocking to read the SSH version string
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705
diff
changeset
|
367 static void read_session_identification() { |
|
4
fe6bca95afa7
Makefile.in contains updated files required
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diff
changeset
|
368 /* max length of 255 chars */ |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
369 char linebuf[256]; |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
370 int len = 0; |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
371 char done = 0; |
|
103
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
372 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
|
373 /* 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
|
374 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
|
375 len = ident_readln(ses.sock_in, linebuf, sizeof(linebuf)); |
|
103
8aeac62a968f
Allow leading lines before the ident banner when connecting
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parents:
41
diff
changeset
|
376 |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
377 if (len < 0 && errno != EINTR) { |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
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parents:
41
diff
changeset
|
378 /* It failed */ |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
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parents:
41
diff
changeset
|
379 break; |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
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parents:
41
diff
changeset
|
380 } |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
381 |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
382 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) { |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
383 /* start of line matches */ |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
changeset
|
384 done = 1; |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
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|
385 break; |
|
8aeac62a968f
Allow leading lines before the ident banner when connecting
Matt Johnston <matt@ucc.asn.au>
parents:
41
diff
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|
386 } |
|
4
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|
387 } |
|
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|
388 |
|
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parents:
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changeset
|
389 if (!done) { |
|
1302
6a14b1f6dc04
better TRACE of failed remote ident
Matt Johnston <matt@ucc.asn.au>
parents:
1276
diff
changeset
|
390 TRACE(("error reading remote ident: %s\n", strerror(errno))) |
|
344
bf29e6659fb9
Just use the normal "remote closed" handler when reading ident stings
Matt Johnston <matt@ucc.asn.au>
parents:
275
diff
changeset
|
391 ses.remoteclosed(); |
|
4
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|
392 } else { |
|
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|
393 /* linebuf is already null terminated */ |
|
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changeset
|
394 ses.remoteident = m_malloc(len); |
|
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|
395 memcpy(ses.remoteident, linebuf, len); |
|
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Makefile.in contains updated files required
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|
396 } |
|
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changeset
|
397 |
|
513
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
398 /* Shall assume that 2.x will be backwards compatible. */ |
|
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
399 if (strncmp(ses.remoteident, "SSH-2.", 6) != 0 |
|
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
400 && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) { |
|
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
401 dropbear_exit("Incompatible remote version '%s'", ses.remoteident); |
|
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
Matt Johnston <matt@ucc.asn.au>
parents:
502
diff
changeset
|
402 } |
|
275
7f9adaf85fca
Exit with a message if the ssh protocol version is incompatible
Matt Johnston <matt@ucc.asn.au>
parents:
242
diff
changeset
|
403 |
|
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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135
diff
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|
404 TRACE(("remoteident: %s", ses.remoteident)) |
|
4
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|
405 |
|
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parents:
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|
406 } |
|
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parents:
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|
407 |
|
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|
408 /* returns the length including null-terminating zero on success, |
|
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|
409 * or -1 on failure */ |
|
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parents:
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changeset
|
410 static int ident_readln(int fd, char* buf, int count) { |
|
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|
411 |
|
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parents:
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|
412 char in; |
|
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parents:
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|
413 int pos = 0; |
|
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parents:
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|
414 int num = 0; |
|
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parents:
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|
415 fd_set fds; |
|
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parents:
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changeset
|
416 struct timeval timeout; |
|
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|
417 |
|
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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|
418 TRACE(("enter ident_readln")) |
|
4
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|
419 |
|
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|
420 if (count < 1) { |
|
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parents:
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|
421 return -1; |
|
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parents:
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|
422 } |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
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changeset
|
423 |
|
1596
60fceff95858
workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents:
1577
diff
changeset
|
424 DROPBEAR_FD_ZERO(&fds); |
|
4
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|
425 |
|
fe6bca95afa7
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parents:
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changeset
|
426 /* select since it's a non-blocking fd */ |
|
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parents:
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|
427 |
|
fe6bca95afa7
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parents:
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changeset
|
428 /* leave space to null-terminate */ |
|
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
429 while (pos < count-1) { |
|
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parents:
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changeset
|
430 |
|
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changeset
|
431 FD_SET(fd, &fds); |
|
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|
432 |
|
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parents:
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changeset
|
433 timeout.tv_sec = 1; |
|
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parents:
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changeset
|
434 timeout.tv_usec = 0; |
|
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parents:
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changeset
|
435 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) { |
|
fe6bca95afa7
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parents:
diff
changeset
|
436 if (errno == EINTR) { |
|
fe6bca95afa7
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parents:
diff
changeset
|
437 continue; |
|
fe6bca95afa7
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|
438 } |
|
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff
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|
439 TRACE(("leave ident_readln: select error")) |
|
4
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|
440 return -1; |
|
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parents:
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|
441 } |
|
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parents:
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|
442 |
|
fe6bca95afa7
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parents:
diff
changeset
|
443 checktimeouts(); |
|
fe6bca95afa7
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parents:
diff
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|
444 |
|
fe6bca95afa7
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parents:
diff
changeset
|
445 /* Have to go one byte at a time, since we don't want to read past |
|
fe6bca95afa7
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parents:
diff
changeset
|
446 * the end, and have to somehow shove bytes back into the normal |
|
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parents:
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|
447 * packet reader */ |
|
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parents:
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changeset
|
448 if (FD_ISSET(fd, &fds)) { |
|
fe6bca95afa7
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|
449 num = read(fd, &in, 1); |
|
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|
450 /* a "\n" is a newline, "\r" we want to read in and keep going |
|
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parents:
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|
451 * so that it won't be read as part of the next line */ |
|
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parents:
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|
452 if (num < 0) { |
|
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parents:
diff
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|
453 /* error */ |
|
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parents:
diff
changeset
|
454 if (errno == EINTR) { |
|
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parents:
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changeset
|
455 continue; /* not a real error */ |
|
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parents:
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changeset
|
456 } |
|
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
|
457 TRACE(("leave ident_readln: read error")) |
|
4
fe6bca95afa7
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parents:
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changeset
|
458 return -1; |
|
fe6bca95afa7
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parents:
diff
changeset
|
459 } |
|
fe6bca95afa7
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parents:
diff
changeset
|
460 if (num == 0) { |
|
fe6bca95afa7
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parents:
diff
changeset
|
461 /* EOF */ |
|
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
|
462 TRACE(("leave ident_readln: EOF")) |
|
4
fe6bca95afa7
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parents:
diff
changeset
|
463 return -1; |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
464 } |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
465 if (in == '\n') { |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
466 /* end of ident string */ |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
467 break; |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
468 } |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
469 /* we don't want to include '\r's */ |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
470 if (in != '\r') { |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
471 buf[pos] = in; |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
472 pos++; |
|
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
473 } |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
474 } |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
475 } |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
476 |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
477 buf[pos] = '\0'; |
|
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
|
478 TRACE(("leave ident_readln: return %d", pos+1)) |
|
4
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
479 return pos+1; |
|
fe6bca95afa7
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
480 } |
|
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
481 |
|
970
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
482 void ignore_recv_response() { |
|
1038
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
1021
diff
changeset
|
483 /* Do nothing */ |
|
970
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
484 TRACE(("Ignored msg_request_response")) |
|
968
f7f6c15b0ec3
Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents:
941
diff
changeset
|
485 } |
|
f7f6c15b0ec3
Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses
Matt Johnston <matt@ucc.asn.au>
parents:
941
diff
changeset
|
486 |
|
939
a0819ecfee0b
Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents:
929
diff
changeset
|
487 static void send_msg_keepalive() { |
|
1038
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
1021
diff
changeset
|
488 time_t old_time_idle = ses.last_packet_time_idle; |
|
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
1021
diff
changeset
|
489 struct Channel *chan = get_any_ready_channel(); |
|
d3925ed45a85
Fix for old compilers, variable declarations at beginning of functions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents:
1021
diff
changeset
|
490 |
|
454
7e43f5e473b9
- Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents:
452
diff
changeset
|
491 CHECKCLEARTOWRITE(); |
|
970
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
492 |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
493 if (chan) { |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
494 /* Channel requests are preferable, more implementations |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
495 handle them than SSH_MSG_GLOBAL_REQUEST */ |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
496 TRACE(("keepalive channel request %d", chan->index)) |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
497 start_send_channel_request(chan, DROPBEAR_KEEPALIVE_STRING); |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
498 } else { |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
499 TRACE(("keepalive global request")) |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
500 /* Some peers will reply with SSH_MSG_REQUEST_FAILURE, |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
501 some will reply with SSH_MSG_UNIMPLEMENTED, some will exit. */ |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
502 buf_putbyte(ses.writepayload, SSH_MSG_GLOBAL_REQUEST); |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
503 buf_putstring(ses.writepayload, DROPBEAR_KEEPALIVE_STRING, |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
504 strlen(DROPBEAR_KEEPALIVE_STRING)); |
|
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents:
968
diff
changeset
|
505 } |
|
939
a0819ecfee0b
Make -K keepalive behave like OpenSSH's ServerAliveInterval
Matt Johnston <matt@ucc.asn.au>
parents:
929
diff
changeset
|
506 buf_putbyte(ses.writepayload, 1); /* want_reply */ |
|
454
7e43f5e473b9
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diff
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|
507 encrypt_packet(); |
|
939
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|
508 |
|
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|
509 ses.last_packet_time_keepalive_sent = monotonic_now(); |
|
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|
510 |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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diff
changeset
|
511 /* keepalives shouldn't update idle timeout, reset it back */ |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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|
512 ses.last_packet_time_idle = old_time_idle; |
|
454
7e43f5e473b9
- Add -K keepalive flag for dropbear and dbclient
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diff
changeset
|
513 } |
|
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- Add -K keepalive flag for dropbear and dbclient
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diff
changeset
|
514 |
| 26 | 515 /* Check all timeouts which are required. Currently these are the time for |
| 516 * user authentication, and the automatic rekeying. */ | |
| 517 static void checktimeouts() { | |
| 518 | |
|
454
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- Add -K keepalive flag for dropbear and dbclient
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diff
changeset
|
519 time_t now; |
|
928
7cd89d4e0335
Add new monotonic_now() wrapper so that timeouts are unaffected by
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927
diff
changeset
|
520 now = monotonic_now(); |
| 26 | 521 |
|
1139
43a8ea69b24c
Fix problem where auth timeout wasn't checked when waiting for ident
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diff
changeset
|
522 if (IS_DROPBEAR_SERVER && ses.connect_time != 0 |
|
43a8ea69b24c
Fix problem where auth timeout wasn't checked when waiting for ident
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diff
changeset
|
523 && now - ses.connect_time >= AUTH_TIMEOUT) { |
|
43a8ea69b24c
Fix problem where auth timeout wasn't checked when waiting for ident
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diff
changeset
|
524 dropbear_close("Timeout before auth"); |
|
43a8ea69b24c
Fix problem where auth timeout wasn't checked when waiting for ident
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diff
changeset
|
525 } |
|
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Fix problem where auth timeout wasn't checked when waiting for ident
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diff
changeset
|
526 |
| 26 | 527 /* we can't rekey if we haven't done remote ident exchange yet */ |
| 528 if (ses.remoteident == NULL) { | |
| 529 return; | |
| 530 } | |
| 531 | |
| 532 if (!ses.kexstate.sentkexinit | |
|
454
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changeset
|
533 && (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT |
|
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diff
changeset
|
534 || 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
|
535 TRACE(("rekeying after timeout or max data reached")) |
| 26 | 536 send_msg_kexinit(); |
| 537 } | |
|
454
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- Add -K keepalive flag for dropbear and dbclient
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diff
changeset
|
538 |
|
970
0bb16232e7c4
Make keepalive handling more robust, this should now match what OpenSSH does
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parents:
968
diff
changeset
|
539 if (opts.keepalive_secs > 0 && ses.authstate.authdone) { |
|
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Make keepalive handling more robust, this should now match what OpenSSH does
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968
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changeset
|
540 /* Avoid sending keepalives prior to auth - those are |
|
0bb16232e7c4
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parents:
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diff
changeset
|
541 not valid pre-auth packet types */ |
|
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changeset
|
542 |
|
939
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changeset
|
543 /* Send keepalives if we've been idle */ |
|
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changeset
|
544 if (now - ses.last_packet_time_any_sent >= opts.keepalive_secs) { |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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changeset
|
545 send_msg_keepalive(); |
|
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|
546 } |
|
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changeset
|
547 |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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changeset
|
548 /* Also send an explicit keepalive message to trigger a response |
|
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|
549 if the remote end hasn't sent us anything */ |
|
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changeset
|
550 if (now - ses.last_packet_time_keepalive_recv >= opts.keepalive_secs |
|
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changeset
|
551 && now - ses.last_packet_time_keepalive_sent >= opts.keepalive_secs) { |
|
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changeset
|
552 send_msg_keepalive(); |
|
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changeset
|
553 } |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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changeset
|
554 |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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changeset
|
555 if (now - ses.last_packet_time_keepalive_recv |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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diff
changeset
|
556 >= opts.keepalive_secs * DEFAULT_KEEPALIVE_LIMIT) { |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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|
557 dropbear_exit("Keepalive timeout"); |
|
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Make -K keepalive behave like OpenSSH's ServerAliveInterval
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|
558 } |
|
454
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- Add -K keepalive flag for dropbear and dbclient
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diff
changeset
|
559 } |
|
513
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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parents:
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diff
changeset
|
560 |
|
939
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|
561 if (opts.idle_timeout_secs > 0 |
|
a0819ecfee0b
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changeset
|
562 && now - ses.last_packet_time_idle >= opts.idle_timeout_secs) { |
|
513
a3748e54273c
Idle timeout patch from Farrell Aultman. Needs testing, unsure if server
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parents:
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diff
changeset
|
563 dropbear_close("Idle timeout"); |
|
a3748e54273c
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diff
changeset
|
564 } |
| 26 | 565 } |
| 566 | |
|
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changeset
|
567 static void update_timeout(long limit, long now, long last_event, long * timeout) { |
|
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changeset
|
568 TRACE2(("update_timeout limit %ld, now %ld, last %ld, timeout %ld", |
|
1140
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diff
changeset
|
569 limit, now, last_event, *timeout)) |
|
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diff
changeset
|
570 if (last_event > 0 && limit > 0) { |
|
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|
571 *timeout = MIN(*timeout, last_event+limit-now); |
|
1143
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diff
changeset
|
572 TRACE2(("new timeout %ld", *timeout)) |
|
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|
573 } |
|
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diff
changeset
|
574 } |
|
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diff
changeset
|
575 |
|
454
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diff
changeset
|
576 static long select_timeout() { |
|
7e43f5e473b9
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diff
changeset
|
577 /* determine the minimum timeout that might be required, so |
|
7e43f5e473b9
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diff
changeset
|
578 as to avoid waking when unneccessary */ |
|
1310
090033317ca1
Avoid busy loop while waiting for rekey response
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parents:
1302
diff
changeset
|
579 long timeout = KEX_REKEY_TIMEOUT; |
|
1140
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diff
changeset
|
580 long now = monotonic_now(); |
|
f6d3a16ecc71
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diff
changeset
|
581 |
|
1310
090033317ca1
Avoid busy loop while waiting for rekey response
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parents:
1302
diff
changeset
|
582 if (!ses.kexstate.sentkexinit) { |
|
090033317ca1
Avoid busy loop while waiting for rekey response
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parents:
1302
diff
changeset
|
583 update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout); |
|
090033317ca1
Avoid busy loop while waiting for rekey response
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parents:
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diff
changeset
|
584 } |
|
1140
f6d3a16ecc71
set timeouts to time remaining rather than timeout duration
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diff
changeset
|
585 |
|
f6d3a16ecc71
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parents:
1139
diff
changeset
|
586 if (ses.authstate.authdone != 1 && IS_DROPBEAR_SERVER) { |
|
f6d3a16ecc71
set timeouts to time remaining rather than timeout duration
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diff
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|
587 /* AUTH_TIMEOUT is only relevant before authdone */ |
|
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set timeouts to time remaining rather than timeout duration
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diff
changeset
|
588 update_timeout(AUTH_TIMEOUT, now, ses.connect_time, &timeout); |
|
f6d3a16ecc71
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diff
changeset
|
589 } |
|
f6d3a16ecc71
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parents:
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diff
changeset
|
590 |
|
1143
924ff1b959a2
only update keepalive timeout post-auth (when keepalives are sent)
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diff
changeset
|
591 if (ses.authstate.authdone) { |
|
924ff1b959a2
only update keepalive timeout post-auth (when keepalives are sent)
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1140
diff
changeset
|
592 update_timeout(opts.keepalive_secs, now, |
|
924ff1b959a2
only update keepalive timeout post-auth (when keepalives are sent)
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1140
diff
changeset
|
593 MAX(ses.last_packet_time_keepalive_recv, ses.last_packet_time_keepalive_sent), |
|
924ff1b959a2
only update keepalive timeout post-auth (when keepalives are sent)
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parents:
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diff
changeset
|
594 &timeout); |
|
924ff1b959a2
only update keepalive timeout post-auth (when keepalives are sent)
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diff
changeset
|
595 } |
|
1140
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diff
changeset
|
596 |
|
f6d3a16ecc71
set timeouts to time remaining rather than timeout duration
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parents:
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diff
changeset
|
597 update_timeout(opts.idle_timeout_secs, now, ses.last_packet_time_idle, |
|
f6d3a16ecc71
set timeouts to time remaining rather than timeout duration
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|
598 &timeout); |
|
f6d3a16ecc71
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diff
changeset
|
599 |
|
f6d3a16ecc71
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parents:
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diff
changeset
|
600 /* clamp negative timeouts to zero - event has already triggered */ |
|
f6d3a16ecc71
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diff
changeset
|
601 return MAX(timeout, 0); |
|
454
7e43f5e473b9
- Add -K keepalive flag for dropbear and dbclient
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452
diff
changeset
|
602 } |
|
482
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
603 |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
604 const char* get_user_shell() { |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
605 /* 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
|
606 if (ses.authstate.pw_shell[0] == '\0') { |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
607 return "/bin/sh"; |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
608 } else { |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
609 return ses.authstate.pw_shell; |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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parents:
479
diff
changeset
|
610 } |
|
7ad49f34a122
- Add run_shell_command() function to run a "sh -c" command, handling
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479
diff
changeset
|
611 } |
|
483
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
612 void fill_passwd(const char* username) { |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
613 struct passwd *pw = NULL; |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
614 if (ses.authstate.pw_name) |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
615 m_free(ses.authstate.pw_name); |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
616 if (ses.authstate.pw_dir) |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
617 m_free(ses.authstate.pw_dir); |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
618 if (ses.authstate.pw_shell) |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
619 m_free(ses.authstate.pw_shell); |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
620 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
|
621 m_free(ses.authstate.pw_passwd); |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents:
482
diff
changeset
|
622 |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
changeset
|
623 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
|
624 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
|
625 return; |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
changeset
|
626 } |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
changeset
|
627 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
|
628 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
|
629 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
|
630 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
|
631 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
|
632 { |
|
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
633 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
|
634 #ifdef HAVE_SHADOW_H |
|
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
635 /* 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
|
636 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
|
637 if (spasswd && spasswd->sp_pwdp) { |
|
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
638 passwd_crypt = spasswd->sp_pwdp; |
|
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
639 } |
|
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
640 #endif |
|
705
2e573f39b88e
Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents:
676
diff
changeset
|
641 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
|
642 /* 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
|
643 passwd_crypt = "!!"; |
|
2e573f39b88e
Android returns NULL for pw_crypt, set it to something else
Matt Johnston <matt@ucc.asn.au>
parents:
676
diff
changeset
|
644 } |
|
676
0edf08895a33
Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
645 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
|
646 } |
|
483
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
changeset
|
647 } |
|
738313e73b1c
- "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
Matt Johnston <matt@ucc.asn.au>
parents:
482
diff
changeset
|
648 |
|
941
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
649 /* Called when channels are modified */ |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
650 void update_channel_prio() { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
651 enum dropbear_prio new_prio; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
652 int any = 0; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
653 unsigned int i; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
654 |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
655 TRACE(("update_channel_prio")) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
656 |
|
1031
64c0aa01e2b6
Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents:
1025
diff
changeset
|
657 if (ses.sock_out < 0) { |
|
64c0aa01e2b6
Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents:
1025
diff
changeset
|
658 TRACE(("leave update_channel_prio: no socket")) |
|
64c0aa01e2b6
Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents:
1025
diff
changeset
|
659 return; |
|
64c0aa01e2b6
Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents:
1025
diff
changeset
|
660 } |
|
64c0aa01e2b6
Update priority once the socket is open
Matt Johnston <matt@ucc.asn.au>
parents:
1025
diff
changeset
|
661 |
|
941
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
662 new_prio = DROPBEAR_PRIO_BULK; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
663 for (i = 0; i < ses.chansize; i++) { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
664 struct Channel *channel = ses.channels[i]; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
665 if (!channel || channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
666 if (channel && channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
667 TRACE(("update_channel_prio: early %d", channel->index)) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
668 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
669 continue; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
670 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
671 any = 1; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
672 if (channel->prio == DROPBEAR_CHANNEL_PRIO_INTERACTIVE) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
673 { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
674 TRACE(("update_channel_prio: lowdelay %d", channel->index)) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
675 new_prio = DROPBEAR_PRIO_LOWDELAY; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
676 break; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
677 } else if (channel->prio == DROPBEAR_CHANNEL_PRIO_UNKNOWABLE |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
678 && new_prio == DROPBEAR_PRIO_BULK) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
679 { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
680 TRACE(("update_channel_prio: unknowable %d", channel->index)) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
681 new_prio = DROPBEAR_PRIO_DEFAULT; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
682 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
683 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
684 |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
685 if (any == 0) { |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
686 /* lowdelay during setup */ |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
687 TRACE(("update_channel_prio: not any")) |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
688 new_prio = DROPBEAR_PRIO_LOWDELAY; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
689 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
690 |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
691 if (new_prio != ses.socket_prio) { |
|
1020
363c0feca5d4
Fix print that no longer works since we're not using fourCCs
Matt Johnston <matt@ucc.asn.au>
parents:
970
diff
changeset
|
692 TRACE(("Dropbear priority transitioning %d -> %d", ses.socket_prio, new_prio)) |
|
941
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
693 set_sock_priority(ses.sock_out, new_prio); |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
694 ses.socket_prio = new_prio; |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
695 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
696 } |
|
5daedffd0769
Set tcp priority as follows:
Matt Johnston <matt@ucc.asn.au>
parents:
940
diff
changeset
|
697 |