Mercurial > dropbear
annotate cli-authpubkey.c @ 1680:5e763ad6e2e0
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 24 May 2020 13:34:19 +0800 |
parents | d5cdc60db08e |
children | 435cfb9ec96e |
rev | line source |
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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 #if DROPBEAR_CLI_PUBKEY_AUTH |
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36 static void send_msg_userauth_pubkey(sign_key *key, enum signature_type sigtype, 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 enum signkey_type keytype; |
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62 enum signature_type sigtype; |
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63 unsigned int remotelen; |
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64 |
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65 TRACE(("enter recv_msg_userauth_pk_ok")) |
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66 |
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67 algotype = buf_getstring(ses.payload, &algolen); |
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68 sigtype = signature_type_from_name(algotype, algolen); |
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69 keytype = signkey_type_from_signature(sigtype); |
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70 TRACE(("recv_msg_userauth_pk_ok: type %d", sigtype)) |
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71 m_free(algotype); |
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72 |
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73 keybuf = buf_new(MAX_PUBKEY_SIZE); |
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74 |
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75 remotelen = buf_getint(ses.payload); |
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76 |
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77 /* Iterate through our keys, find which one it was that matched, and |
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78 * send a real request with that key */ |
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79 for (iter = cli_opts.privkeys->first; iter; iter = iter->next) { |
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80 sign_key *key = (sign_key*)iter->item; |
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81 if (key->type != keytype) { |
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82 /* Types differed */ |
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83 TRACE(("types differed")) |
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84 continue; |
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85 } |
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86 |
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87 /* Now we compare the contents of the key */ |
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88 keybuf->pos = keybuf->len = 0; |
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89 buf_put_pub_key(keybuf, key, keytype); |
47 | 90 buf_setpos(keybuf, 0); |
91 buf_incrpos(keybuf, 4); /* first int is the length of the remainder (ie | |
92 remotelen) which has already been taken from | |
93 the remote buffer */ | |
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94 |
47 | 95 |
96 if (keybuf->len-4 != remotelen) { | |
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97 TRACE(("lengths differed: localh %d remote %d", keybuf->len, remotelen)) |
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98 /* Lengths differed */ |
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99 continue; |
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100 } |
47 | 101 if (memcmp(buf_getptr(keybuf, remotelen), |
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102 buf_getptr(ses.payload, remotelen), remotelen) != 0) { |
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103 /* Data didn't match this key */ |
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104 TRACE(("data differed")) |
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105 continue; |
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106 } |
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107 |
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108 /* Success */ |
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109 break; |
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110 } |
340 | 111 buf_free(keybuf); |
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112 |
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113 if (iter != NULL) { |
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114 TRACE(("matching key")) |
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115 /* XXX TODO: if it's an encrypted key, here we ask for their |
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116 * password */ |
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117 send_msg_userauth_pubkey((sign_key*)iter->item, sigtype, 1); |
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118 } else { |
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119 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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120 } |
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Fix leak of keybuf in recv_msg_userauth_pk_ok, courtesy of Klocwork
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121 |
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122 TRACE(("leave recv_msg_userauth_pk_ok")) |
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123 } |
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124 |
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125 static void cli_buf_put_sign(buffer* buf, sign_key *key, enum signature_type sigtype, |
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126 const buffer *data_buf) { |
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127 #if DROPBEAR_CLI_AGENTFWD |
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128 // TODO: rsa-sha256 agent |
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129 if (key->source == SIGNKEY_SOURCE_AGENT) { |
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130 /* Format the agent signature ourselves, as buf_put_sign would. */ |
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131 buffer *sigblob; |
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132 sigblob = buf_new(MAX_PUBKEY_SIZE); |
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133 agent_buf_sign(sigblob, key, data_buf); |
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134 buf_putbufstring(buf, sigblob); |
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135 buf_free(sigblob); |
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136 } else |
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137 #endif /* DROPBEAR_CLI_AGENTFWD */ |
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138 { |
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139 buf_put_sign(buf, key, sigtype, data_buf); |
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140 } |
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141 } |
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142 |
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143 static void send_msg_userauth_pubkey(sign_key *key, enum signature_type sigtype, int realsign) { |
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144 |
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145 const char *algoname = NULL; |
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146 unsigned int algolen; |
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147 buffer* sigbuf = NULL; |
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148 enum signkey_type keytype = signkey_type_from_signature(sigtype); |
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149 |
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150 TRACE(("enter send_msg_userauth_pubkey sigtype %d", sigtype)) |
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151 CHECKCLEARTOWRITE(); |
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152 |
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153 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST); |
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154 |
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155 buf_putstring(ses.writepayload, cli_opts.username, |
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156 strlen(cli_opts.username)); |
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157 |
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158 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, |
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159 SSH_SERVICE_CONNECTION_LEN); |
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160 |
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161 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY, |
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162 AUTH_METHOD_PUBKEY_LEN); |
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163 |
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164 buf_putbyte(ses.writepayload, realsign); |
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165 |
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166 algoname = signature_name_from_type(sigtype, &algolen); |
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167 buf_putstring(ses.writepayload, algoname, algolen); |
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168 buf_put_pub_key(ses.writepayload, key, keytype); |
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169 |
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170 if (realsign) { |
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171 TRACE(("realsign")) |
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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 + ses.session_id->len + ses.writepayload->len); |
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175 buf_putbufstring(sigbuf, ses.session_id); |
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176 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len); |
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177 cli_buf_put_sign(ses.writepayload, key, sigtype, sigbuf); |
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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(); |
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182 TRACE(("leave send_msg_userauth_pubkey")) |
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183 } |
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184 |
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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 enum signature_type sigtype; |
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188 TRACE(("enter cli_auth_pubkey")) |
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189 |
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190 #if DROPBEAR_CLI_AGENTFWD |
560 | 191 if (!cli_opts.agent_keys_loaded) { |
225
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192 /* get the list of available keys from the agent */ |
560 | 193 cli_load_agent_keys(cli_opts.privkeys); |
550
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194 cli_opts.agent_keys_loaded = 1; |
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195 TRACE(("cli_auth_pubkey: agent keys loaded")) |
225
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196 } |
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Fixed compilation with unset ENABLE_{SVR,CLI}_AGENTFWD.
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|
197 #endif |
225
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198 |
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199 /* iterate through privkeys to remove ones not allowed in server-sig-algs */ |
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200 while (cli_opts.privkeys->first) { |
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201 sign_key * key = (sign_key*)cli_opts.privkeys->first->item; |
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202 if (cli_ses.server_sig_algs) { |
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203 #ifdef DROPBEAR_RSA |
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204 if (key->type == DROPBEAR_SIGNKEY_RSA) { |
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205 #if DROPBEAR_RSA_SHA256 |
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206 if (buf_has_algo(cli_ses.server_sig_algs, SSH_SIGNATURE_RSA_SHA256) |
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207 == DROPBEAR_SUCCESS) { |
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208 sigtype = DROPBEAR_SIGNATURE_RSA_SHA256; |
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209 TRACE(("server-sig-algs allows rsa sha256")) |
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210 break; |
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211 } |
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212 #endif /* DROPBEAR_RSA_SHA256 */ |
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213 #if DROPBEAR_RSA_SHA1 |
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214 if (buf_has_algo(cli_ses.server_sig_algs, SSH_SIGNKEY_RSA) |
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215 == DROPBEAR_SUCCESS) { |
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216 sigtype = DROPBEAR_SIGNATURE_RSA_SHA1; |
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217 TRACE(("server-sig-algs allows rsa sha1")) |
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218 break; |
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219 } |
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220 #endif /* DROPBEAR_RSA_SHA256 */ |
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221 } else |
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222 #endif /* DROPBEAR_RSA */ |
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223 { |
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224 /* Not RSA */ |
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225 const char *name = NULL; |
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226 sigtype = signature_type_from_signkey(key->type); |
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227 name = signature_name_from_type(sigtype, NULL); |
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228 if (buf_has_algo(cli_ses.server_sig_algs, name) |
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229 == DROPBEAR_SUCCESS) { |
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230 TRACE(("server-sig-algs allows %s", name)) |
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231 break; |
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232 } |
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233 } |
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234 |
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235 /* No match, skip this key */ |
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236 TRACE(("server-sig-algs no match keytype %d, skipping", key->type)) |
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237 key = list_remove(cli_opts.privkeys->first); |
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238 sign_key_free(key); |
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239 continue; |
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240 } else { |
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241 /* Server didn't provide a server-sig-algs list, we'll |
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242 assume all except rsa-sha256 are OK. */ |
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243 #if DROPBEAR_RSA |
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244 if (key->type == DROPBEAR_SIGNKEY_RSA) { |
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245 #ifdef DROPBEAR_RSA_SHA1 |
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246 sigtype = DROPBEAR_SIGNATURE_RSA_SHA1; |
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247 TRACE(("no server-sig-algs, using rsa sha1")) |
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248 break; |
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249 #else |
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250 /* only support rsa-sha256, skip this key */ |
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251 TRACE(("no server-sig-algs, skipping rsa sha256")) |
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252 key = list_remove(cli_opts.privkeys->first); |
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253 sign_key_free(key); |
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254 continue; |
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255 #endif |
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256 } /* key->type == DROPBEAR_SIGNKEY_RSA */ |
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257 #endif /* DROPBEAR_RSA */ |
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258 sigtype = signature_type_from_signkey(key->type); |
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259 TRACE(("no server-sig-algs, using key")) |
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260 break; |
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261 } |
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262 } |
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263 |
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264 if (cli_opts.privkeys->first) { |
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265 sign_key * key = (sign_key*)cli_opts.privkeys->first->item; |
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266 /* Send a trial request */ |
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267 send_msg_userauth_pubkey(key, sigtype, 0); |
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268 cli_ses.lastprivkey = key; |
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269 TRACE(("leave cli_auth_pubkey-success")) |
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270 return 1; |
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271 } else { |
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272 /* no more keys left */ |
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273 TRACE(("leave cli_auth_pubkey-failure")) |
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274 return 0; |
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275 } |
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276 } |
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277 |
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278 void cli_auth_pubkey_cleanup() { |
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279 |
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280 #if DROPBEAR_CLI_AGENTFWD |
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281 m_close(cli_opts.agent_fd); |
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282 cli_opts.agent_fd = -1; |
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283 #endif |
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284 |
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285 while (cli_opts.privkeys->first) { |
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286 sign_key * key = list_remove(cli_opts.privkeys->first); |
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287 sign_key_free(key); |
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288 } |
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289 } |
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290 #endif /* Pubkey auth */ |