1 | /* |
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2 | |
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3 | ssh.h |
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4 | |
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5 | Author: Tatu Ylonen <ylo@cs.hut.fi> |
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6 | |
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7 | Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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8 | All rights reserved |
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9 | |
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10 | Created: Fri Mar 17 17:09:37 1995 ylo |
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11 | |
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12 | Generic header file for ssh. |
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13 | |
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14 | */ |
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15 | |
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16 | /* |
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17 | * $Id: ssh.h,v 1.1.1.4 1999-03-08 17:43:43 danw Exp $ |
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18 | * $Log: not supported by cvs2svn $ |
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19 | * Revision 1.25 1998/07/08 01:05:30 kivinen |
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20 | * Added consts. |
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21 | * |
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22 | * Revision 1.24 1998/07/08 00:50:13 kivinen |
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23 | * Added some prototypes. Added setting PASSWD_PATH if not set in |
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24 | * by the configure. |
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25 | * |
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26 | * Revision 1.23 1998/05/23 20:37:44 kivinen |
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27 | * Added OSF1 C2 prototypes. |
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28 | * |
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29 | * Revision 1.22 1998/03/27 17:02:55 kivinen |
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30 | * Added gateway ports option. Added ignore root rhosts option. |
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31 | * |
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32 | * Revision 1.21 1998/01/02 06:23:01 kivinen |
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33 | * Renamed SSH_AUTHENTICATION_SOCKET to SSH_AUTH_SOCK. |
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34 | * |
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35 | * Revision 1.20 1997/04/27 21:55:35 kivinen |
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36 | * Added channel_add_{allow,deny}_forwd_{to,port} prototypes. |
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37 | * Added match_port prototype. |
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38 | * |
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39 | * Revision 1.19 1997/04/21 01:06:44 kivinen |
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40 | * Fixed prototype for server_loop to have cleanup_context |
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41 | * instead of ttyname. |
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42 | * |
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43 | * Revision 1.18 1997/04/17 04:17:02 kivinen |
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44 | * Added read_confirmation prototype. |
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45 | * Added ttyname to server_loop prototype. |
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46 | * |
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47 | * Revision 1.17 1997/04/05 22:01:10 kivinen |
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48 | * Fixed typo in SSH_AUTH_KERBEROS. |
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49 | * |
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50 | * Revision 1.16 1997/03/27 03:11:13 kivinen |
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51 | * Added kerberos patches from Glenn Machin. |
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52 | * |
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53 | * Revision 1.15 1997/03/26 07:12:09 kivinen |
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54 | * Fixed prototypes. |
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55 | * Added UID_ROOT define. |
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56 | * |
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57 | * Revision 1.14 1997/03/19 17:44:13 kivinen |
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58 | * Added TISAuthentication stuff from Andre April |
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59 | * <Andre.April@cediti.be>. |
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60 | * |
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61 | * Revision 1.13 1996/12/04 18:14:30 ttsalo |
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62 | * Added new option, LOCAL_HOSTNAME_IN_DEBUG |
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63 | * |
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64 | * Revision 1.12 1996/11/24 08:27:48 kivinen |
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65 | * Fixed auth_input_request_forwarding prototype. |
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66 | * |
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67 | * Revision 1.11 1996/11/05 16:03:00 ttsalo |
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68 | * Removed the get_permanent_fd prototype |
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69 | * |
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70 | * Revision 1.10 1996/10/29 22:46:55 kivinen |
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71 | * Changed PROTOCOL_MINOR from 4 to 5. |
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72 | * log -> log_msg. |
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73 | * |
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74 | * Revision 1.9 1996/10/20 16:28:39 ttsalo |
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75 | * Added global variable original_real_uid |
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76 | * |
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77 | * Revision 1.8 1996/09/24 20:17:54 ylo |
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78 | * Changed identity files to be always encrypted with 3DES (used |
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79 | * to be IDEA, when it is compiled in). This is to make identity |
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80 | * files more compatible with versions that don't include IDEA |
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81 | * for patent reasons. |
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82 | * |
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83 | * Revision 1.7 1996/09/08 17:21:09 ttsalo |
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84 | * A lot of changes in agent-socket handling |
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85 | * |
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86 | * Revision 1.6 1996/09/04 12:42:31 ttsalo |
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87 | * Added pid to agent-socket name |
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88 | * |
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89 | * Revision 1.5 1996/08/29 14:51:24 ttsalo |
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90 | * Agent-socket directory handling implemented |
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91 | * |
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92 | * Revision 1.4 1996/08/21 20:43:56 ttsalo |
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93 | * Made ssh-agent use a different, more secure way of storing |
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94 | * it's initial socket. |
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95 | * |
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96 | * Revision 1.3 1996/08/13 09:04:21 ttsalo |
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97 | * Home directory, .ssh and .ssh/authorized_keys are now |
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98 | * checked for wrong owner and group & world writeability. |
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99 | * |
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100 | * Revision 1.2 1996/04/22 23:49:45 huima |
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101 | * Changed protocol version to 1.4, added calls to emulate module. |
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102 | * |
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103 | * Revision 1.1.1.1 1996/02/18 21:38:10 ylo |
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104 | * Imported ssh-1.2.13. |
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105 | * |
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106 | * Revision 1.16 1995/10/02 01:31:13 ylo |
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107 | * Moved sshd.pid to PIDDIR. Also changed file name. |
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108 | * Added SSH_HOSTS_EQUIV (shosts.equiv). |
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109 | * |
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110 | * Revision 1.15 1995/09/27 02:16:24 ylo |
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111 | * Added SSH_USER_RC and SSH_SYSTEM_RC. |
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112 | * |
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113 | * Revision 1.14 1995/09/25 00:02:06 ylo |
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114 | * Added client_loop. |
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115 | * Added screen number arguments. |
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116 | * Added connection_attempts. |
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117 | * |
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118 | * Revision 1.13 1995/09/22 22:23:41 ylo |
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119 | * Changed argument list of ssh_login. |
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120 | * |
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121 | * Revision 1.12 1995/09/21 17:14:08 ylo |
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122 | * Added original_real_uid argument to ssh_connect. |
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123 | * |
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124 | * Revision 1.11 1995/09/10 22:47:59 ylo |
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125 | * Added server_loop. |
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126 | * Added original_real_uid parameter to ssh_login. |
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127 | * |
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128 | * Revision 1.10 1995/09/09 21:26:46 ylo |
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129 | * /m/shadows/u2/users/ylo/ssh/README |
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130 | * |
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131 | * Revision 1.9 1995/08/31 09:23:42 ylo |
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132 | * Added support for ETCDIR. |
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133 | * |
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134 | * Revision 1.8 1995/08/29 22:33:52 ylo |
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135 | * Added get_remote_ipaddr, get_permanent_fd. |
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136 | * Deleted SSH_NUM_DUPS. |
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137 | * |
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138 | * Revision 1.7 1995/08/21 23:28:57 ylo |
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139 | * Added SERVER_CONFIG_FILE. |
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140 | * Added syslog facility definitions. |
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141 | * |
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142 | * Revision 1.6 1995/08/18 22:57:06 ylo |
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143 | * Now uses 3DES as the authfile cipher if IDEA is not available. |
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144 | * |
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145 | * Revision 1.5 1995/07/27 00:41:04 ylo |
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146 | * Added GlobalKnownHostsFile and UserKnownHostsFile. |
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147 | * |
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148 | * Revision 1.4 1995/07/26 23:28:56 ylo |
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149 | * Changed PROTOCOL_MINOR from 0 to 1. |
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150 | * |
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151 | * Revision 1.3 1995/07/16 01:02:26 ylo |
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152 | * Removed host argument from record_logout. |
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153 | * |
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154 | * Revision 1.2 1995/07/13 01:40:22 ylo |
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155 | * Removed "Last modified" header. |
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156 | * Added cvs log. |
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157 | * |
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158 | * $Endlog$ |
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159 | */ |
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160 | |
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161 | #ifndef SSH_H |
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162 | #define SSH_H |
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163 | |
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164 | #include <gmp.h> |
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165 | #include "rsa.h" |
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166 | #include "randoms.h" |
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167 | #include "cipher.h" |
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168 | |
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169 | /* The default cipher used if IDEA is not supported by the remote host. |
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170 | It is recommended that this be one of the mandatory ciphers (DES, 3DES), |
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171 | though that is not required. */ |
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172 | #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES |
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173 | |
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174 | /* Cipher used for encrypting authentication files. */ |
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175 | #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES |
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176 | |
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177 | /* Default port number. */ |
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178 | #define SSH_DEFAULT_PORT 22 |
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179 | |
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180 | /* Maximum number of TCP/IP ports forwarded per direction. */ |
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181 | #define SSH_MAX_FORWARDS_PER_DIRECTION 100 |
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182 | |
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183 | /* Maximum number of RSA authentication identity files that can be specified |
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184 | in configuration files or on the command line. */ |
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185 | #define SSH_MAX_IDENTITY_FILES 100 |
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186 | |
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187 | /* Major protocol version. Different version indicates major incompatiblity |
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188 | that prevents communication. */ |
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189 | #define PROTOCOL_MAJOR 1 |
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190 | |
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191 | /* Minor protocol version. Different version indicates minor incompatibility |
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192 | that does not prevent interoperation. */ |
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193 | #define PROTOCOL_MINOR 5 |
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194 | |
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195 | /* Name for the service. The port named by this service overrides the default |
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196 | port if present. */ |
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197 | #define SSH_SERVICE_NAME "ssh" |
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198 | |
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199 | /* System-wide file containing host keys of known hosts. This file should be |
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200 | world-readable. */ |
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201 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" |
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202 | |
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203 | /* HOST_KEY_FILE /etc/ssh_host_key, |
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204 | SERVER_CONFIG_FILE /etc/sshd_config, |
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205 | and HOST_CONFIG_FILE /etc/ssh_config |
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206 | are all defined in Makefile.in. Of these, ssh_host_key should be readable |
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207 | only by root, whereas ssh_config should be world-readable. */ |
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208 | |
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209 | /* Random seed file for the daemon. This file should be readable only by |
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210 | root. */ |
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211 | #define SSH_DAEMON_SEED_FILE ETCDIR "/ssh_random_seed" |
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212 | |
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213 | /* The process id of the daemon listening for connections is saved |
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214 | here to make it easier to kill the correct daemon when necessary. */ |
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215 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" |
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216 | |
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217 | /* The directory in user\'s home directory in which the files reside. |
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218 | The directory should be world-readable (though not all files are). */ |
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219 | #define SSH_USER_DIR ".ssh" |
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220 | |
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221 | /* Per-user file containing host keys of known hosts. This file need |
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222 | not be readable by anyone except the user him/herself, though this does |
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223 | not contain anything particularly secret. */ |
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224 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" |
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225 | |
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226 | /* Name of the file containing client-side random seed. This file should |
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227 | only be readable by the user him/herself. */ |
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228 | #define SSH_CLIENT_SEEDFILE ".ssh/random_seed" |
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229 | |
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230 | /* Name of the default file containing client-side authentication key. |
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231 | This file should only be readable by the user him/herself. */ |
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232 | #define SSH_CLIENT_IDENTITY ".ssh/identity" |
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233 | |
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234 | /* Configuration file in user\'s home directory. This file need not be |
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235 | readable by anyone but the user him/herself, but does not contain |
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236 | anything particularly secret. If the user\'s home directory resides |
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237 | on an NFS volume where root is mapped to nobody, this may need to be |
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238 | world-readable. */ |
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239 | #define SSH_USER_CONFFILE ".ssh/config" |
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240 | |
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241 | /* File containing a list of those rsa keys that permit logging in as |
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242 | this user. This file need not be |
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243 | readable by anyone but the user him/herself, but does not contain |
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244 | anything particularly secret. If the user\'s home directory resides |
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245 | on an NFS volume where root is mapped to nobody, this may need to be |
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246 | world-readable. (This file is read by the daemon which is running as |
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247 | root.) */ |
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248 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" |
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249 | |
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250 | /* Per-user and system-wide ssh "rc" files. These files are executed with |
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251 | /bin/sh before starting the shell or command if they exist. They |
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252 | will be passed "proto cookie" as arguments if X11 forwarding with |
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253 | spoofing is in use. xauth will be run if neither of these exists. */ |
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254 | #define SSH_USER_RC ".ssh/rc" |
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255 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" |
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256 | |
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257 | /* Ssh-only version of /etc/hosts.equiv. */ |
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258 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" |
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259 | |
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260 | /* Additionally, the daemon may use ~/.rhosts and /etc/hosts.equiv if |
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261 | rhosts authentication is enabled. */ |
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262 | |
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263 | /* Socket for connecting the authentication agent. Normally the connection |
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264 | to the authentication agent is passed in a file descriptor; however, |
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265 | on some systems, commonly used shells close all open file descriptors. |
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266 | To make the agent usable on those systems, configure checks whether |
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267 | the shells close all descriptors, and if so, uses a socket instead. |
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268 | That socket is an unix-domain socket and must not be accessible by |
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269 | anyone but the user him/herself. A directory \'ssh-agent-<loginname>\' |
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270 | is created under /tmp, which is supposedly on the local machine, |
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271 | and socket is created under the directory. On some systems, sockets\' |
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272 | protections are not adequately checked, so this mode 700 per-user |
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273 | directory is needed. If socket were in the user\'s home directory, |
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274 | the daemon (running as root) might not be able to create and listen |
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275 | to the socket. |
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276 | |
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277 | SSH_AGENT_SOCKET_DIR can be changed to something else ("/tmp/.ssh/ssh-%s" |
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278 | for example), but only the last directory in the path will be |
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279 | dynamically created and deleted by sshd and ssh-agent. */ |
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280 | #define SSH_AGENT_SOCKET_DIR "/tmp/ssh-%.50s" |
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281 | #define SSH_AGENT_SOCKET "agent-socket-%d" |
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282 | |
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283 | /* Name of the environment variable containing the pathname of the |
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284 | authentication socket. */ |
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285 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" |
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286 | |
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287 | /* Check that we always have PASSWD_PATH set */ |
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288 | #ifndef PASSWD_PATH |
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289 | #define PASSWD_PATH "/bin/passwd" |
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290 | #endif /* PASSWD_PATH */ |
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291 | |
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292 | /* Force host key length and server key length to differ by at least this |
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293 | many bits. This is to make double encryption with rsaref work. */ |
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294 | #define SSH_KEY_BITS_RESERVED 128 |
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295 | |
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296 | /* Length of the session key in bytes. (Specified as 256 bits in the |
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297 | protocol.) */ |
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298 | #define SSH_SESSION_KEY_LENGTH 32 |
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299 | |
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300 | #ifdef KERBEROS |
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301 | #ifdef KRB5 |
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302 | #include <krb5.h> |
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303 | #define KRB_SERVICE_NAME "host" |
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304 | #endif /* KRB5 */ |
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305 | #endif /* KERBEROS */ |
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306 | |
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307 | /* Authentication methods. New types can be added, but old types should not |
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308 | be removed for compatibility. The maximum allowed value is 31. */ |
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309 | #define SSH_AUTH_RHOSTS 1 |
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310 | #define SSH_AUTH_RSA 2 |
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311 | #define SSH_AUTH_PASSWORD 3 |
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312 | #define SSH_AUTH_RHOSTS_RSA 4 |
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313 | #define SSH_AUTH_TIS 5 |
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314 | #define SSH_AUTH_KERBEROS 6 |
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315 | #define SSH_PASS_KERBEROS_TGT 7 |
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316 | |
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317 | /* These are reserved for official patches, do not use them */ |
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318 | #define SSH_AUTH_RESERVED_1 8 |
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319 | #define SSH_AUTH_RESERVED_2 9 |
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320 | #define SSH_AUTH_RESERVED_3 10 |
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321 | #define SSH_AUTH_RESERVED_4 11 |
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322 | #define SSH_AUTH_RESERVED_5 12 |
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323 | #define SSH_AUTH_RESERVED_6 13 |
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324 | #define SSH_AUTH_RESERVED_7 14 |
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325 | #define SSH_AUTH_RESERVED_8 15 |
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326 | |
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327 | /* If you add new methods add them after this using random number between 16-31 |
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328 | so if someone else adds also new methods you dont use same number. */ |
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329 | |
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330 | /* Protocol flags. These are bit masks. */ |
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331 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ |
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332 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ |
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333 | |
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334 | /* Definition of message types. New values can be added, but old values |
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335 | should not be removed or without careful consideration of the consequences |
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336 | for compatibility. The maximum value is 254; value 255 is reserved |
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337 | for future extension. */ |
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338 | /* Message name */ /* msg code */ /* arguments */ |
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339 | #define SSH_MSG_NONE 0 /* no message */ |
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340 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ |
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341 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ |
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342 | #define SSH_CMSG_SESSION_KEY 3 /* key (MP_INT) */ |
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343 | #define SSH_CMSG_USER 4 /* user (string) */ |
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344 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ |
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345 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (MP_INT) */ |
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346 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (MP_INT) */ |
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347 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (MP_INT) */ |
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348 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ |
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349 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ |
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350 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ |
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351 | #define SSH_CMSG_EXEC_SHELL 12 /* */ |
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352 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ |
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353 | #define SSH_SMSG_SUCCESS 14 /* */ |
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354 | #define SSH_SMSG_FAILURE 15 /* */ |
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355 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ |
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356 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ |
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357 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ |
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358 | #define SSH_CMSG_EOF 19 /* */ |
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359 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ |
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360 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ |
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361 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ |
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362 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ |
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363 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ |
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364 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ |
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365 | |
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366 | /* new channel protocol */ |
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367 | #define SSH_MSG_CHANNEL_INPUT_EOF 24 |
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368 | #define SSH_MSG_CHANNEL_OUTPUT_CLOSED 25 |
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369 | |
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370 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ |
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371 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ |
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372 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ |
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373 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ |
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374 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ |
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375 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ |
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376 | #define SSH_MSG_IGNORE 32 /* string */ |
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377 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ |
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378 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ |
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379 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ |
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380 | #define SSH_MSG_DEBUG 36 /* string */ |
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381 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ |
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382 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* max_size (int) */ |
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383 | |
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384 | /* Support for TIS authentication server |
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385 | Contributed by Andre April <Andre.April@cediti.be>. */ |
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386 | #define SSH_CMSG_AUTH_TIS 39 /* */ |
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387 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* string */ |
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388 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* pass (string) */ |
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389 | |
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390 | /* Support for kerberos authentication by Glenn Machin and Dug Song |
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391 | <dugsong@umich.edu> */ |
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392 | #define SSH_CMSG_AUTH_KERBEROS 42 /* string (KTEXT) */ |
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393 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* string (KTEXT) */ |
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394 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* string (credentials) */ |
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395 | |
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396 | /* Reserved for official extensions, do not use these */ |
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397 | #define SSH_CMSG_RESERVED_START 45 |
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398 | #define SSH_CMSG_RESERVED_END 63 |
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399 | |
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400 | /* If ou add new messages add them starting from something after 64, better to |
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401 | use some random number between 64-127 so if someone else adds something else |
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402 | you dont use same numbers */ |
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403 | |
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404 | |
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405 | /* define this and debug() will print local hostname */ |
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406 | #define LOCAL_HOSTNAME_IN_DEBUG 1 |
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407 | |
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408 | /* Includes that need definitions above. */ |
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409 | |
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410 | #include "readconf.h" |
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411 | |
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412 | /*------------ definitions for login.c -------------*/ |
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413 | |
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414 | /* Returns the time when the user last logged in. Returns 0 if the |
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415 | information is not available. This must be called before record_login. |
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416 | The host from which the user logged in is stored in buf. */ |
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417 | unsigned long get_last_login_time(uid_t uid, const char *logname, |
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418 | char *buf, unsigned int bufsize); |
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419 | |
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420 | /* Records that the user has logged in. This does many things normally |
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421 | done by login(1). */ |
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422 | void record_login(int pid, const char *ttyname, const char *user, uid_t uid, |
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423 | const char *host, struct sockaddr_in *addr); |
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424 | |
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425 | /* Records that the user has logged out. This does many thigs normally |
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426 | done by login(1) or init. */ |
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427 | void record_logout(int pid, const char *ttyname); |
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428 | |
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429 | /*------------ definitions for sshconnect.c ----------*/ |
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430 | |
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431 | /* Opens a TCP/IP connection to the remote server on the given host. If |
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432 | port is 0, the default port will be used. If anonymous is zero, |
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433 | a privileged port will be allocated to make the connection. |
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434 | This requires super-user privileges if anonymous is false. |
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435 | Connection_attempts specifies the maximum number of tries, one per |
---|
436 | second. This returns true on success, and zero on failure. If the |
---|
437 | connection is successful, this calls packet_set_connection for the |
---|
438 | connection. */ |
---|
439 | int ssh_connect(const char *host, int port, int connection_attempts, |
---|
440 | int anonymous, uid_t original_real_uid, |
---|
441 | const char *proxy_command, RandomState *random_state); |
---|
442 | |
---|
443 | /* Starts a dialog with the server, and authenticates the current user on the |
---|
444 | server. This does not need any extra privileges. The basic connection |
---|
445 | to the server must already have been established before this is called. |
---|
446 | If login fails, this function prints an error and never returns. |
---|
447 | This initializes the random state, and leaves it initialized (it will also |
---|
448 | have references from the packet module). */ |
---|
449 | void ssh_login(RandomState *state, int host_key_valid, RSAPrivateKey *host_key, |
---|
450 | const char *host, Options *options, uid_t original_real_uid); |
---|
451 | |
---|
452 | /*------------ Definitions for various authentication methods. -------*/ |
---|
453 | |
---|
454 | /* Tries to authenticate the user using the .rhosts file. Returns true if |
---|
455 | authentication succeeds. If ignore_rhosts is non-zero, this will not |
---|
456 | consider .rhosts and .shosts (/etc/hosts.equiv will still be used). |
---|
457 | If strict_modes is true, checks ownership and modes of .rhosts/.shosts. */ |
---|
458 | int auth_rhosts(struct passwd *pw, const char *client_user, |
---|
459 | int ignore_rhosts, int ignore_root_rhosts, |
---|
460 | int strict_modes); |
---|
461 | |
---|
462 | /* Tries to authenticate the user using the .rhosts file and the host using |
---|
463 | its host key. Returns true if authentication succeeds. */ |
---|
464 | int auth_rhosts_rsa(RandomState *state, |
---|
465 | struct passwd *pw, const char *client_user, |
---|
466 | unsigned int bits, MP_INT *client_host_key_e, |
---|
467 | MP_INT *client_host_key_n, int ignore_rhosts, |
---|
468 | int ignore_root_rhosts, int strict_modes); |
---|
469 | |
---|
470 | /* Tries to authenticate the user using password. Returns true if |
---|
471 | authentication succeeds. */ |
---|
472 | #if defined(KERBEROS) && defined(KRB5) |
---|
473 | int auth_password(const char *server_user, const char *password, |
---|
474 | krb5_principal client); |
---|
475 | #else /* defined(KERBEROS) && defined(KRB5) */ |
---|
476 | int auth_password(const char *server_user, const char *password); |
---|
477 | #endif /* defined(KERBEROS) && defined(KRB5) */ |
---|
478 | |
---|
479 | /* Performs the RSA authentication dialog with the client. This returns |
---|
480 | 0 if the client could not be authenticated, and 1 if authentication was |
---|
481 | successful. This may exit if there is a serious protocol violation. */ |
---|
482 | int auth_rsa(struct passwd *pw, MP_INT *client_n, RandomState *state, |
---|
483 | int strict_modes); |
---|
484 | |
---|
485 | /* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer |
---|
486 | over the key. Skips any whitespace at the beginning and at end. */ |
---|
487 | int auth_rsa_read_key(char **cpp, unsigned int *bitsp, MP_INT *e, MP_INT *n); |
---|
488 | |
---|
489 | /* Returns the name of the machine at the other end of the socket. The |
---|
490 | returned string should be freed by the caller. */ |
---|
491 | char *get_remote_hostname(int socket); |
---|
492 | |
---|
493 | /* Return the canonical name of the host in the other side of the current |
---|
494 | connection (as returned by packet_get_connection). The host name is |
---|
495 | cached, so it is efficient to call this several times. */ |
---|
496 | const char *get_canonical_hostname(void); |
---|
497 | |
---|
498 | /* Returns the remote IP address as an ascii string. The value need not be |
---|
499 | freed by the caller. */ |
---|
500 | const char *get_remote_ipaddr(void); |
---|
501 | |
---|
502 | /* Returns the port number of the peer of the socket. */ |
---|
503 | int get_peer_port(int sock); |
---|
504 | |
---|
505 | /* Returns the port number of the remote host. */ |
---|
506 | int get_remote_port(void); |
---|
507 | |
---|
508 | /* Tries to match the host name (which must be in all lowercase) against the |
---|
509 | comma-separated sequence of subpatterns (each possibly preceded by ! to |
---|
510 | indicate negation). Returns true if there is a positive match; zero |
---|
511 | otherwise. */ |
---|
512 | int match_hostname(const char *host, const char *ip, |
---|
513 | const char *pattern, unsigned int len); |
---|
514 | |
---|
515 | /* Checks whether the given host is already in the list of our known hosts. |
---|
516 | Returns HOST_OK if the host is known and has the specified key, |
---|
517 | HOST_NEW if the host is not known, and HOST_CHANGED if the host is known |
---|
518 | but used to have a different host key. The host must be in all lowercase. |
---|
519 | The check (file accesses) will be performed using the given uid with |
---|
520 | userfile. */ |
---|
521 | typedef enum { HOST_OK, HOST_NEW, HOST_CHANGED } HostStatus; |
---|
522 | HostStatus check_host_in_hostfile(uid_t uid, |
---|
523 | const char *filename, |
---|
524 | const char *host, unsigned int bits, |
---|
525 | MP_INT *e, MP_INT *n); |
---|
526 | |
---|
527 | /* Appends an entry to the host file. Returns false if the entry |
---|
528 | could not be appended. The operation will be performed with the given |
---|
529 | uid using userfile. */ |
---|
530 | int add_host_to_hostfile(uid_t uid, const char *filename, const char *host, |
---|
531 | unsigned int bits, MP_INT *e, MP_INT *n); |
---|
532 | |
---|
533 | /* Performs the RSA authentication challenge-response dialog with the client, |
---|
534 | and returns true (non-zero) if the client gave the correct answer to |
---|
535 | our challenge; returns zero if the client gives a wrong answer. */ |
---|
536 | int auth_rsa_challenge_dialog(RandomState *state, unsigned int bits, |
---|
537 | MP_INT *e, MP_INT *n); |
---|
538 | |
---|
539 | /* Reads a passphrase from /dev/tty with echo turned off. Returns the |
---|
540 | passphrase (allocated with xmalloc). Exits if EOF is encountered. |
---|
541 | If from_stdin is true, the passphrase will be read from stdin instead. |
---|
542 | If this needs to use an auxiliary program to read the passphrase, |
---|
543 | this will run it with the given uid using userfile. */ |
---|
544 | char *read_passphrase(uid_t uid, const char *prompt, int from_stdin); |
---|
545 | |
---|
546 | /* Reads a yes/no confirmation from /dev/tty. Exits if EOF or "no" is |
---|
547 | encountered. */ |
---|
548 | void read_confirmation(const char *prompt); |
---|
549 | |
---|
550 | /* Saves the authentication (private) key in a file, encrypting it with |
---|
551 | passphrase. The identification of the file (lowest 64 bits of n) |
---|
552 | will precede the key to provide identification of the key without |
---|
553 | needing a passphrase. File I/O will be done using the given uid with |
---|
554 | userfile. */ |
---|
555 | int save_private_key(uid_t uid, const char *filename, const char *passphrase, |
---|
556 | RSAPrivateKey *private_key, const char *comment, |
---|
557 | RandomState *state); |
---|
558 | |
---|
559 | /* Loads the public part of the key file (public key and comment). |
---|
560 | Returns 0 if an error occurred; zero if the public key was successfully |
---|
561 | read. The comment of the key is returned in comment_return if it is |
---|
562 | non-NULL; the caller must free the value with xfree. File I/O will be |
---|
563 | done with the given uid using userfile. */ |
---|
564 | int load_public_key(uid_t uid, const char *filename, RSAPublicKey *pub, |
---|
565 | char **comment_return); |
---|
566 | |
---|
567 | /* Loads the private key from the file. Returns 0 if an error is encountered |
---|
568 | (file does not exist or is not readable, or passphrase is bad). |
---|
569 | This initializes the private key. The comment of the key is returned |
---|
570 | in comment_return if it is non-NULL; the caller must free the value |
---|
571 | with xfree. File I/O will be done with the given uid using userfile. */ |
---|
572 | int load_private_key(uid_t uid, const char *filename, const char *passphrase, |
---|
573 | RSAPrivateKey *private_key, char **comment_return); |
---|
574 | |
---|
575 | /*------------ Definitions for logging. -----------------------*/ |
---|
576 | |
---|
577 | /* Supported syslog facilities. */ |
---|
578 | typedef enum |
---|
579 | { |
---|
580 | SYSLOG_FACILITY_DAEMON, |
---|
581 | SYSLOG_FACILITY_USER, |
---|
582 | SYSLOG_FACILITY_AUTH, |
---|
583 | SYSLOG_FACILITY_LOCAL0, |
---|
584 | SYSLOG_FACILITY_LOCAL1, |
---|
585 | SYSLOG_FACILITY_LOCAL2, |
---|
586 | SYSLOG_FACILITY_LOCAL3, |
---|
587 | SYSLOG_FACILITY_LOCAL4, |
---|
588 | SYSLOG_FACILITY_LOCAL5, |
---|
589 | SYSLOG_FACILITY_LOCAL6, |
---|
590 | SYSLOG_FACILITY_LOCAL7 |
---|
591 | } SyslogFacility; |
---|
592 | |
---|
593 | typedef enum { |
---|
594 | SYSLOG_SEVERITY_DEBUG, |
---|
595 | SYSLOG_SEVERITY_INFO, |
---|
596 | SYSLOG_SEVERITY_NOTICE, |
---|
597 | SYSLOG_SEVERITY_WARNING, |
---|
598 | SYSLOG_SEVERITY_ERR, |
---|
599 | SYSLOG_SEVERITY_CRIT |
---|
600 | } SyslogSeverity; |
---|
601 | |
---|
602 | /* Initializes logging. If debug is non-zero, debug() will output something. |
---|
603 | If quiet is non-zero, none of these will log send anything to syslog |
---|
604 | (but maybe to stderr). */ |
---|
605 | void log_init(char *av0, int on_stderr, int debug, int quiet, |
---|
606 | SyslogFacility facility); |
---|
607 | |
---|
608 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
609 | The format must guarantee that the final message does not exceed 1024 |
---|
610 | characters. The message should not contain newline. */ |
---|
611 | void log_msg(const char *fmt, ...); |
---|
612 | |
---|
613 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
614 | The format must guarantee that the final message does not exceed 1024 |
---|
615 | characters. The message should not contain newline. The message |
---|
616 | is logged at the given severity level. */ |
---|
617 | void log_severity(SyslogSeverity severity, const char *fmt, ...); |
---|
618 | |
---|
619 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
620 | The format must guarantee that the final message does not exceed 1024 |
---|
621 | characters. The message should not contain newline. */ |
---|
622 | void debug(const char *fmt, ...); |
---|
623 | |
---|
624 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
625 | The format must guarantee that the final message does not exceed 1024 |
---|
626 | characters. The message should not contain newline. */ |
---|
627 | void error(const char *fmt, ...); |
---|
628 | |
---|
629 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
630 | The format must guarantee that the final message does not exceed 1024 |
---|
631 | characters. The message should not contain newline. |
---|
632 | This call never returns. */ |
---|
633 | void fatal(const char *fmt, ...); |
---|
634 | |
---|
635 | /* Outputs a message to syslog or stderr, depending on the implementation. |
---|
636 | The format must guarantee that the final message does not exceed 1024 |
---|
637 | characters. The message should not contain newline. |
---|
638 | This call never returns. The message is logged with the specified |
---|
639 | severity level. */ |
---|
640 | void fatal_severity(SyslogSeverity severity, const char *fmt, ...); |
---|
641 | |
---|
642 | /* Registers a cleanup function to be called by fatal() before exiting. |
---|
643 | It is permissible to call fatal_remove_cleanup for the function itself |
---|
644 | from the function. */ |
---|
645 | void fatal_add_cleanup(void (*proc)(void *context), void *context); |
---|
646 | |
---|
647 | /* Removes a cleanup frunction to be called at fatal(). */ |
---|
648 | void fatal_remove_cleanup(void (*proc)(void *context), void *context); |
---|
649 | |
---|
650 | /*---------------- definitions for x11.c ------------------*/ |
---|
651 | |
---|
652 | |
---|
653 | /* Sets specific protocol options. */ |
---|
654 | void channel_set_options(int hostname_in_open); |
---|
655 | |
---|
656 | /* Allocate a new channel object and set its type and socket. Remote_name |
---|
657 | must have been allocated with xmalloc; this will free it when the channel |
---|
658 | is freed. */ |
---|
659 | int channel_allocate(int type, int sock, char *remote_name); |
---|
660 | |
---|
661 | /* Free the channel and close its socket. */ |
---|
662 | void channel_free(int channel); |
---|
663 | |
---|
664 | /* Add any bits relevant to channels in select bitmasks. */ |
---|
665 | void channel_prepare_select(fd_set *readset, fd_set *writeset); |
---|
666 | |
---|
667 | /* After select, perform any appropriate operations for channels which |
---|
668 | have events pending. */ |
---|
669 | void channel_after_select(fd_set *readset, fd_set *writeset); |
---|
670 | |
---|
671 | /* If there is data to send to the connection, send some of it now. */ |
---|
672 | void channel_output_poll(void); |
---|
673 | |
---|
674 | /* This is called when a packet of type CHANNEL_DATA has just been received. |
---|
675 | The message type has already been consumed, but channel number and data |
---|
676 | is still there. */ |
---|
677 | void channel_input_data(void); |
---|
678 | |
---|
679 | /* Returns true if no channel has too much buffered data. */ |
---|
680 | int channel_not_very_much_buffered_data(void); |
---|
681 | |
---|
682 | /* This is called after receiving CHANNEL_CLOSE. */ |
---|
683 | void channel_input_close(void); |
---|
684 | |
---|
685 | /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */ |
---|
686 | void channel_input_close_confirmation(void); |
---|
687 | |
---|
688 | /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */ |
---|
689 | void channel_input_open_confirmation(void); |
---|
690 | |
---|
691 | /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */ |
---|
692 | void channel_input_open_failure(void); |
---|
693 | |
---|
694 | /* This closes any sockets that are listening for connections; this removes |
---|
695 | any unix domain sockets. */ |
---|
696 | void channel_stop_listening(void); |
---|
697 | |
---|
698 | /* Closes the sockets of all channels. This is used to close extra file |
---|
699 | descriptors after a fork. */ |
---|
700 | void channel_close_all(void); |
---|
701 | |
---|
702 | /* Returns the maximum file descriptor number used by the channels. */ |
---|
703 | int channel_max_fd(void); |
---|
704 | |
---|
705 | /* Returns true if there is still an open channel over the connection. */ |
---|
706 | int channel_still_open(void); |
---|
707 | |
---|
708 | /* Returns a string containing a list of all open channels. The list is |
---|
709 | suitable for displaying to the user. It uses crlf instead of newlines. |
---|
710 | The caller should free the string with xfree. */ |
---|
711 | char *channel_open_message(void); |
---|
712 | |
---|
713 | /* Initiate forwarding of connections to local port "port" through the secure |
---|
714 | channel to host:port from remote side. This never returns if there |
---|
715 | was an error. */ |
---|
716 | void channel_request_local_forwarding(int port, const char *host, |
---|
717 | int remote_port, |
---|
718 | int gateway_ports); |
---|
719 | |
---|
720 | /* Initiate forwarding of connections to port "port" on remote host through |
---|
721 | the secure channel to host:port from local side. This never returns |
---|
722 | if there was an error. This registers that open requests for that |
---|
723 | port are permitted. */ |
---|
724 | void channel_request_remote_forwarding(int port, const char *host, |
---|
725 | int remote_port); |
---|
726 | |
---|
727 | /* Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually |
---|
728 | called by the server, because the user could connect to any port anyway, |
---|
729 | and the server has no way to know but to trust the client anyway. */ |
---|
730 | void channel_permit_all_opens(void); |
---|
731 | |
---|
732 | #ifdef F_SECURE_COMMERCIAL |
---|
733 | |
---|
734 | |
---|
735 | |
---|
736 | |
---|
737 | |
---|
738 | |
---|
739 | |
---|
740 | |
---|
741 | |
---|
742 | |
---|
743 | |
---|
744 | #endif /* F_SECURE_COMMERCIAL */ |
---|
745 | |
---|
746 | /* This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
---|
747 | listening for the port, and sends back a success reply (or disconnect |
---|
748 | message if there was an error). This never returns if there was an |
---|
749 | error. */ |
---|
750 | void channel_input_port_forward_request(int is_root); |
---|
751 | |
---|
752 | /* This is called after receiving PORT_OPEN message. This attempts to connect |
---|
753 | to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION or |
---|
754 | CHANNEL_OPEN_FAILURE. */ |
---|
755 | void channel_input_port_open(void); |
---|
756 | |
---|
757 | /* Creates a port for X11 connections, and starts listening for it. |
---|
758 | Returns the display name, or NULL if an error was encountered. */ |
---|
759 | char *x11_create_display(int screen); |
---|
760 | |
---|
761 | /* Creates an internet domain socket for listening for X11 connections. |
---|
762 | Returns a suitable value for the DISPLAY variable, or NULL if an error |
---|
763 | occurs. */ |
---|
764 | char *x11_create_display_inet(int screen); |
---|
765 | |
---|
766 | /* This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
---|
767 | the remote channel number. We should do whatever we want, and respond |
---|
768 | with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. */ |
---|
769 | void x11_input_open(void); |
---|
770 | |
---|
771 | /* Requests forwarding of X11 connections. This should be called on the |
---|
772 | client only. */ |
---|
773 | void x11_request_forwarding(void); |
---|
774 | |
---|
775 | /* Requests forwarding for X11 connections, with authentication spoofing. |
---|
776 | This should be called in the client only. */ |
---|
777 | void x11_request_forwarding_with_spoofing(RandomState *state, |
---|
778 | const char *proto, const char *data); |
---|
779 | |
---|
780 | /* Sends a message to the server to request authentication fd forwarding. */ |
---|
781 | void auth_request_forwarding(void); |
---|
782 | |
---|
783 | /* Returns the number of the file descriptor to pass to child programs as |
---|
784 | the authentication fd. */ |
---|
785 | int auth_get_fd(void); |
---|
786 | |
---|
787 | /* Returns the name of the forwarded authentication socket. Returns NULL |
---|
788 | if there is no forwarded authentication socket. The returned value points |
---|
789 | to a static buffer. */ |
---|
790 | char *auth_get_socket_name(void); |
---|
791 | |
---|
792 | /* Tries to delete the authentication agent proxy socket and |
---|
793 | directory */ |
---|
794 | void auth_delete_socket(void *context); |
---|
795 | |
---|
796 | /* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
---|
797 | This starts forwarding authentication requests. This returns true if |
---|
798 | everything succeeds, otherwise it will return false (agent forwarding |
---|
799 | disabled). */ |
---|
800 | int auth_input_request_forwarding(struct passwd *pw); |
---|
801 | |
---|
802 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
---|
803 | void auth_input_open_request(void); |
---|
804 | |
---|
805 | /* Returns true if the given string matches the pattern (which may contain |
---|
806 | ? and * as wildcards), and zero if it does not match. */ |
---|
807 | int match_pattern(const char *s, const char *pattern); |
---|
808 | /* this combines the effect of match_pattern on a username, hostname |
---|
809 | and IP address. */ |
---|
810 | int match_user(const char *user, const char *host, const char *ip, |
---|
811 | const char *pattern); |
---|
812 | /* Check that host name matches the pattern. If the pattern only contains |
---|
813 | numbers and periods, and wildcards compare it against the ip address |
---|
814 | otherwise assume it is host name */ |
---|
815 | int match_host(const char *host, const char *ip, const char *pattern); |
---|
816 | |
---|
817 | #ifdef F_SECURE_COMMERCIAL |
---|
818 | |
---|
819 | #endif /* F_SECURE_COMMERCIAL */ |
---|
820 | |
---|
821 | /* Expands tildes in the file name. Returns data allocated by xmalloc. |
---|
822 | Warning: this calls getpw*. */ |
---|
823 | char *tilde_expand_filename(const char *filename, uid_t my_uid); |
---|
824 | |
---|
825 | /* Performs the interactive session. This handles data transmission between |
---|
826 | the client and the program. Note that the notion of stdin, stdout, and |
---|
827 | stderr in this function is sort of reversed: this function writes to |
---|
828 | stdin (of the child program), and reads from stdout and stderr (of the |
---|
829 | child program). |
---|
830 | This will close fdin, fdout and fderr after releasing pty (if ttyname is non |
---|
831 | NULL) */ |
---|
832 | void server_loop(int pid, int fdin, int fdout, int fderr, |
---|
833 | void *cleanup_context); |
---|
834 | |
---|
835 | /* Client side main loop for the interactive session. */ |
---|
836 | int client_loop(int have_pty, int escape_char); |
---|
837 | |
---|
838 | /* Linked list of custom environment strings (see auth-rsa.c). */ |
---|
839 | struct envstring { |
---|
840 | struct envstring *next; |
---|
841 | char *s; |
---|
842 | }; |
---|
843 | |
---|
844 | |
---|
845 | /* Functions from signals.c. */ |
---|
846 | |
---|
847 | /* Sets signal handlers so that core dumps are prevented. This also |
---|
848 | sets the maximum core dump size to zero as an extra precaution (where |
---|
849 | supported). The old core dump size limit is saved. */ |
---|
850 | void signals_prevent_core(void); |
---|
851 | |
---|
852 | /* Sets all signals to their default state. Restores RLIMIT_CORE previously |
---|
853 | saved by prevent_core(). */ |
---|
854 | void signals_reset(void); |
---|
855 | |
---|
856 | /* Global variables */ |
---|
857 | |
---|
858 | extern uid_t original_real_uid; |
---|
859 | |
---|
860 | #ifdef AMIGA |
---|
861 | #define UID_ROOT 65535 |
---|
862 | #else |
---|
863 | #define UID_ROOT 0 |
---|
864 | #endif |
---|
865 | |
---|
866 | #ifdef HAVE_OSF1_C2_SECURITY |
---|
867 | void initialize_osf_security(int ac, char **av); |
---|
868 | |
---|
869 | const char *osf1c2_check_account_and_terminal(const char *username, |
---|
870 | const char *terminal); |
---|
871 | |
---|
872 | int osf1c2_getprpwent(char *p, char *n, int len); |
---|
873 | |
---|
874 | char *osf1c2crypt(const char *pw, char *salt); |
---|
875 | #endif /* HAVE_OSF1_C2_SECURITY */ |
---|
876 | |
---|
877 | #endif /* SSH_H */ |
---|