annotate pubkeyapi.h @ 1795:f0a524208d97

Update cli-main.c (#114) Moved pid_t proxy_cmd_pid declaration at begin of block to allow build in c89 (gcc-2.95)
author Guillaume Picquet <guillaume.picquet@gls-france.com>
date Thu, 04 Mar 2021 13:46:46 +0100
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24 #ifndef DROPBEAR_PUBKEY_H
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25 #define DROPBEAR_PUBKEY_H
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26
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27
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28 /* External Public Key API (EPKA) Plug-in Interface
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29 *
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30 * See:
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31 * https://github.com/fabriziobertocci/dropbear-epka
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32 * for additional information and examples about this API
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33 *
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34 */
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35
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36 struct PluginInstance;
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37 struct PluginSession;
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38
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39 /* API VERSION INFORMATION -
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40 * Dropbear will:
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41 * - Reject any plugin with a major version mismatch
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42 * - Load and print a warning if the plugin's minor version is HIGHER than
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43 * dropbear's minor version (assumes properties are added at the end of
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44 * PluginInstance or PluginSession). This is a case of plugin newer than dropbear.
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45 * - Reject if the plugin minor version is SMALLER than dropbear one (case
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46 * of plugin older than dropbear).
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47 * - Load (with no warnings) if version match.
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48 */
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49 #define DROPBEAR_PLUGIN_VERSION_MAJOR 1
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50 #define DROPBEAR_PLUGIN_VERSION_MINOR 0
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51
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52
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53 /* Creates an instance of the plugin.
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54 *
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55 * This is the main entry point of the plug-in and should be IMMUTABLE across
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56 * different API versions. Dropbear will check the version number
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57 * returned in the api_version to match the version it understands and reject
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58 * any plugin for which API major version does not match.
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59 *
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60 * If the version MINOR is different, dropbear will allow the plugin to run
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61 * only if: plugin_MINOR > dropbear_MINOR
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62 *
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63 * If plugin_MINOR < dropbear_MINOR or if the MAJOR version is different
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64 * dropbear will reject the plugin and terminate the execution.
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65 *
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66 * addrstring is the IP address of the client.
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67 *
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68 * Returns NULL in case of failure, otherwise a void * of the instance that need
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69 * to be passed to all the subsequent call to the plugin
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70 */
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71 typedef struct PluginInstance *(* PubkeyExtPlugin_newFn)(int verbose,
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72 const char *options,
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73 const char *addrstring);
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74 #define DROPBEAR_PUBKEY_PLUGIN_FNNAME_NEW "plugin_new"
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75
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76
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77 /* Validate a client through public key authentication
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78 *
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79 * If session has not been already created, creates it and store it
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80 * in *sessionInOut.
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81 * If session is a non-NULL, it will reuse it.
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82 *
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83 * Returns DROPBEAR_SUCCESS (0) if success or DROPBEAR_FAILURE (-1) if
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84 * authentication fails
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85 */
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86 typedef int (* PubkeyExtPlugin_checkPubKeyFn)(struct PluginInstance *PluginInstance,
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87 struct PluginSession **sessionInOut,
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88 const char* algo,
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89 unsigned int algolen,
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90 const unsigned char* keyblob,
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91 unsigned int keybloblen,
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92 const char *username);
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93
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94 /* Notify the plugin that auth completed (after signature verification)
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95 */
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96 typedef void (* PubkeyExtPlugin_authSuccessFn)(struct PluginSession *session);
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97
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98 /* Deletes a session
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99 * TODO: Add a reason why the session is terminated. See svr_dropbear_exit (in svr-session.c)
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100 */
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101 typedef void (* PubkeyExtPlugin_sessionDeleteFn)(struct PluginSession *session);
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102
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103 /* Deletes the plugin instance */
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104 typedef void (* PubkeyExtPlugin_deleteFn)(struct PluginInstance *PluginInstance);
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105
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106
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107 /* The PluginInstance object - A simple container of the pointer to the functions used
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108 * by Dropbear.
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109 *
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110 * A plug-in can extend it to add its own properties
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111 *
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112 * The instance is created from the call to the plugin_new() function of the
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113 * shared library.
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114 * The delete_plugin function should delete the object.
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115 */
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116 struct PluginInstance {
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117 int api_version[2]; /* 0=Major, 1=Minor */
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118
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119 PubkeyExtPlugin_checkPubKeyFn checkpubkey; /* mandatory */
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120 PubkeyExtPlugin_authSuccessFn auth_success; /* optional */
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121 PubkeyExtPlugin_sessionDeleteFn delete_session; /* mandatory */
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122 PubkeyExtPlugin_deleteFn delete_plugin; /* mandatory */
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123 };
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124
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125 /*****************************************************************************
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126 * SESSION
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127 ****************************************************************************/
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128 /* Returns the options from the session.
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129 * The returned buffer will be destroyed when the session is deleted.
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130 * Option buffer string NULL-terminated
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131 */
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132 typedef char * (* PubkeyExtPlugin_getOptionsFn)(struct PluginSession *session);
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133
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134
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135 /* An SSH Session. Created during pre-auth and reused during the authentication.
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136 * The plug-in should delete this object (or any object extending it) from
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137 * the delete_session() function.
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138 *
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139 * Extend it to cache user and authentication information that can be
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140 * reused between pre-auth and auth (and to store whatever session-specific
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141 * variable you need to keep).
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142 *
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143 * Store any optional auth options in the auth_options property of the session.
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144 */
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145 struct PluginSession {
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146 struct PluginInstance * plugin_instance;
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147
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148 PubkeyExtPlugin_getOptionsFn get_options;
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149 };
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150
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151 #endif