annotate cli-authpubkey.c @ 662:d354464b2aa6 DROPBEAR_2012.55

- Improve CHANGES description
author Matt Johnston <matt@ucc.asn.au>
date Thu, 23 Feb 2012 21:45:36 +0800
parents 52d7301e46bd
children 405418f7dc5e
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rev   line source
74
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "buffer.h"
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28 #include "dbutil.h"
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29 #include "session.h"
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30 #include "ssh.h"
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31 #include "runopts.h"
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32 #include "auth.h"
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33 #include "agentfwd.h"
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34
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35 #ifdef ENABLE_CLI_PUBKEY_AUTH
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36 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign);
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37
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38 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request.
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39 * We use it to remove the key we tried from the list */
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40 void cli_pubkeyfail() {
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41 m_list_elem *iter;
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42 for (iter = cli_opts.privkeys->first; iter; iter = iter->next) {
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43 sign_key *iter_key = (sign_key*)iter->item;
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44
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45 if (iter_key == cli_ses.lastprivkey)
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46 {
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47 /* found the failing key */
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48 list_remove(iter);
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49 sign_key_free(iter_key);
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50 cli_ses.lastprivkey = NULL;
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51 return;
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52 }
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53 }
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54 }
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55
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56 void recv_msg_userauth_pk_ok() {
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57 m_list_elem *iter;
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58 buffer* keybuf = NULL;
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59 char* algotype = NULL;
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60 unsigned int algolen;
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61 int keytype;
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62 unsigned int remotelen;
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63
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64 TRACE(("enter recv_msg_userauth_pk_ok"))
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65
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66 algotype = buf_getstring(ses.payload, &algolen);
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67 keytype = signkey_type_from_name(algotype, algolen);
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68 TRACE(("recv_msg_userauth_pk_ok: type %d", keytype))
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69 m_free(algotype);
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70
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71 keybuf = buf_new(MAX_PUBKEY_SIZE);
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72
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73 remotelen = buf_getint(ses.payload);
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74
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75 /* Iterate through our keys, find which one it was that matched, and
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76 * send a real request with that key */
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77 for (iter = cli_opts.privkeys->first; iter; iter = iter->next) {
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78 sign_key *key = (sign_key*)iter->item;
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79 if (key->type != keytype) {
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80 /* Types differed */
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81 TRACE(("types differed"))
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82 continue;
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83 }
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84
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85 /* Now we compare the contents of the key */
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86 keybuf->pos = keybuf->len = 0;
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87 buf_put_pub_key(keybuf, key, keytype);
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88 buf_setpos(keybuf, 0);
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89 buf_incrpos(keybuf, 4); /* first int is the length of the remainder (ie
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90 remotelen) which has already been taken from
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91 the remote buffer */
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92
47
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93
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94 if (keybuf->len-4 != remotelen) {
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95 TRACE(("lengths differed: localh %d remote %d", keybuf->len, remotelen))
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96 /* Lengths differed */
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97 continue;
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98 }
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99 if (memcmp(buf_getptr(keybuf, remotelen),
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100 buf_getptr(ses.payload, remotelen), remotelen) != 0) {
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101 /* Data didn't match this key */
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102 TRACE(("data differed"))
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103 continue;
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104 }
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105
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106 /* Success */
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107 break;
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108 }
340
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109 buf_free(keybuf);
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110
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111 if (iter != NULL) {
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112 TRACE(("matching key"))
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113 /* XXX TODO: if it's an encrypted key, here we ask for their
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114 * password */
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115 send_msg_userauth_pubkey((sign_key*)iter->item, keytype, 1);
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116 } else {
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117 TRACE(("That was whacky. We got told that a key was valid, but it didn't match our list. Sounds like dodgy code on Dropbear's part"))
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118 }
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119
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120 TRACE(("leave recv_msg_userauth_pk_ok"))
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121 }
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122
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123 void cli_buf_put_sign(buffer* buf, sign_key *key, int type,
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124 const unsigned char *data, unsigned int len)
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125 {
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126 if (key->source == SIGNKEY_SOURCE_AGENT) {
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127 /* Format the agent signature ourselves, as buf_put_sign would. */
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128 buffer *sigblob;
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129 sigblob = buf_new(MAX_PUBKEY_SIZE);
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130 agent_buf_sign(sigblob, key, data, len);
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131 buf_setpos(sigblob, 0);
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132 buf_putstring(buf, buf_getptr(sigblob, sigblob->len),
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133 sigblob->len);
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134
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135 buf_free(sigblob);
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136 } else {
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137 buf_put_sign(buf, key, type, data, len);
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138 }
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139
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140 }
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141
45
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142 /* TODO: make it take an agent reference to use as well */
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143 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign) {
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144
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145 const char *algoname = NULL;
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146 int algolen;
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147 buffer* sigbuf = NULL;
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148
165
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149 TRACE(("enter send_msg_userauth_pubkey"))
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150 CHECKCLEARTOWRITE();
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151
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152 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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153
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154 buf_putstring(ses.writepayload, cli_opts.username,
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155 strlen(cli_opts.username));
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156
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157 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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158 SSH_SERVICE_CONNECTION_LEN);
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159
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160 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY,
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161 AUTH_METHOD_PUBKEY_LEN);
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162
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163 buf_putbyte(ses.writepayload, realsign);
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164
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165 algoname = signkey_name_from_type(type, &algolen);
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166
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167 buf_putstring(ses.writepayload, algoname, algolen);
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168 buf_put_pub_key(ses.writepayload, key, type);
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169
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170 if (realsign) {
165
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171 TRACE(("realsign"))
45
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172 /* We put the signature as well - this contains string(session id), then
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173 * the contents of the write payload to this point */
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174 sigbuf = buf_new(4 + SHA1_HASH_SIZE + ses.writepayload->len);
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175 buf_putstring(sigbuf, ses.session_id, SHA1_HASH_SIZE);
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176 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len);
552
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177 cli_buf_put_sign(ses.writepayload, key, type, sigbuf->data, sigbuf->len);
45
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178 buf_free(sigbuf); /* Nothing confidential in the buffer */
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179 }
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180
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181 encrypt_packet();
165
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182 TRACE(("leave send_msg_userauth_pubkey"))
45
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183 }
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184
551
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185 /* Returns 1 if a key was tried */
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186 int cli_auth_pubkey() {
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187
165
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188 TRACE(("enter cli_auth_pubkey"))
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189
560
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190 if (!cli_opts.agent_keys_loaded) {
225
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191 /* get the list of available keys from the agent */
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192 cli_load_agent_keys(cli_opts.privkeys);
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193 cli_opts.agent_keys_loaded = 1;
225
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194 }
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195
551
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196 if (cli_opts.privkeys->first) {
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197 sign_key * key = (sign_key*)cli_opts.privkeys->first->item;
45
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198 /* Send a trial request */
551
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199 send_msg_userauth_pubkey(key, key->type, 0);
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200 cli_ses.lastprivkey = key;
165
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201 TRACE(("leave cli_auth_pubkey-success"))
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202 return 1;
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203 } else {
552
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204 /* no more keys left */
165
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205 TRACE(("leave cli_auth_pubkey-failure"))
45
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206 return 0;
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207 }
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208 }
552
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209
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210 void cli_auth_pubkey_cleanup() {
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211
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212 #ifdef ENABLE_CLI_AGENTFWD
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213 m_close(cli_opts.agent_fd);
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214 cli_opts.agent_fd = -1;
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diff changeset
215 #endif
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216
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diff changeset
217 while (cli_opts.privkeys->first) {
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diff changeset
218 sign_key * key = list_remove(cli_opts.privkeys->first);
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diff changeset
219 sign_key_free(key);
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diff changeset
220 }
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diff changeset
221 }
68
eee77ac31ccc cleaning up the pubkey defines
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parents: 62
diff changeset
222 #endif /* Pubkey auth */