Mercurial > dropbear
annotate cli-authpubkey.c @ 441:fdf06a5a54e4
Allow reading dbclient password from an environment var
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 17 Mar 2007 06:30:11 +0000 |
parents | 7f010e3b1802 |
children | c1e9c81d1d27 9e51707cd6f2 |
rev | line source |
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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 |
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34 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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35 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign); |
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36 |
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37 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request. |
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38 * We use it to remove the key we tried from the list */ |
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39 void cli_pubkeyfail() { |
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40 |
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41 struct SignKeyList *keyitem; |
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42 struct SignKeyList **previtem; |
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43 |
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44 TRACE(("enter cli_pubkeyfail")) |
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45 previtem = &cli_opts.privkeys; |
62 | 46 |
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47 /* Find the key we failed with, and remove it */ |
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48 for (keyitem = cli_opts.privkeys; keyitem != NULL; keyitem = keyitem->next) { |
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49 if (keyitem == cli_ses.lastprivkey) { |
62 | 50 *previtem = keyitem->next; |
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51 } |
62 | 52 previtem = &keyitem; |
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53 } |
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54 |
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55 sign_key_free(cli_ses.lastprivkey->key); /* It won't be used again */ |
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56 m_free(cli_ses.lastprivkey); |
62 | 57 |
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58 TRACE(("leave cli_pubkeyfail")) |
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59 } |
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60 |
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61 void recv_msg_userauth_pk_ok() { |
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62 |
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63 struct SignKeyList *keyitem = NULL; |
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64 buffer* keybuf = NULL; |
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65 char* algotype = NULL; |
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66 unsigned int algolen; |
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67 int keytype; |
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68 unsigned int remotelen; |
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69 |
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70 TRACE(("enter recv_msg_userauth_pk_ok")) |
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71 |
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72 algotype = buf_getstring(ses.payload, &algolen); |
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73 keytype = signkey_type_from_name(algotype, algolen); |
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74 TRACE(("recv_msg_userauth_pk_ok: type %d", keytype)) |
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75 m_free(algotype); |
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76 |
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77 keybuf = buf_new(MAX_PUBKEY_SIZE); |
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78 |
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79 remotelen = buf_getint(ses.payload); |
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80 |
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81 /* Iterate through our keys, find which one it was that matched, and |
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82 * send a real request with that key */ |
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83 for (keyitem = cli_opts.privkeys; keyitem != NULL; keyitem = keyitem->next) { |
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84 |
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85 if (keyitem->type != keytype) { |
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86 /* Types differed */ |
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87 TRACE(("types differed")) |
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88 continue; |
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89 } |
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90 |
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91 /* Now we compare the contents of the key */ |
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92 keybuf->pos = keybuf->len = 0; |
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93 buf_put_pub_key(keybuf, keyitem->key, keytype); |
47 | 94 buf_setpos(keybuf, 0); |
95 buf_incrpos(keybuf, 4); /* first int is the length of the remainder (ie | |
96 remotelen) which has already been taken from | |
97 the remote buffer */ | |
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98 |
47 | 99 |
100 if (keybuf->len-4 != remotelen) { | |
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101 TRACE(("lengths differed: localh %d remote %d", keybuf->len, remotelen)) |
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102 /* Lengths differed */ |
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103 continue; |
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104 } |
47 | 105 if (memcmp(buf_getptr(keybuf, remotelen), |
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106 buf_getptr(ses.payload, remotelen), remotelen) != 0) { |
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107 /* Data didn't match this key */ |
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108 TRACE(("data differed")) |
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109 continue; |
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110 } |
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111 |
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112 /* Success */ |
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113 break; |
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114 } |
340 | 115 buf_free(keybuf); |
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116 |
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117 if (keyitem != NULL) { |
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118 TRACE(("matching key")) |
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119 /* XXX TODO: if it's an encrypted key, here we ask for their |
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120 * password */ |
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121 send_msg_userauth_pubkey(keyitem->key, keytype, 1); |
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122 } else { |
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123 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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124 } |
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125 |
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126 TRACE(("leave recv_msg_userauth_pk_ok")) |
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127 } |
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128 |
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129 /* TODO: make it take an agent reference to use as well */ |
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130 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign) { |
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131 |
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132 const char *algoname = NULL; |
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133 int algolen; |
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134 buffer* sigbuf = NULL; |
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135 |
165
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136 TRACE(("enter send_msg_userauth_pubkey")) |
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137 CHECKCLEARTOWRITE(); |
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138 |
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139 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST); |
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140 |
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141 buf_putstring(ses.writepayload, cli_opts.username, |
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142 strlen(cli_opts.username)); |
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143 |
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144 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION, |
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145 SSH_SERVICE_CONNECTION_LEN); |
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146 |
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147 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY, |
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148 AUTH_METHOD_PUBKEY_LEN); |
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149 |
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150 buf_putbyte(ses.writepayload, realsign); |
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151 |
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152 algoname = signkey_name_from_type(type, &algolen); |
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153 |
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154 buf_putstring(ses.writepayload, algoname, algolen); |
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155 buf_put_pub_key(ses.writepayload, key, type); |
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156 |
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157 if (realsign) { |
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158 TRACE(("realsign")) |
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159 /* We put the signature as well - this contains string(session id), then |
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160 * the contents of the write payload to this point */ |
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161 sigbuf = buf_new(4 + SHA1_HASH_SIZE + ses.writepayload->len); |
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162 buf_putstring(sigbuf, ses.session_id, SHA1_HASH_SIZE); |
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163 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len); |
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164 buf_put_sign(ses.writepayload, key, type, sigbuf->data, sigbuf->len); |
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165 buf_free(sigbuf); /* Nothing confidential in the buffer */ |
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166 } |
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167 |
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168 encrypt_packet(); |
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169 TRACE(("leave send_msg_userauth_pubkey")) |
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170 } |
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171 |
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172 int cli_auth_pubkey() { |
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173 |
165
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174 TRACE(("enter cli_auth_pubkey")) |
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175 |
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176 if (cli_opts.privkeys != NULL) { |
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177 /* Send a trial request */ |
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178 send_msg_userauth_pubkey(cli_opts.privkeys->key, |
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179 cli_opts.privkeys->type, 0); |
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180 cli_ses.lastprivkey = cli_opts.privkeys; |
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181 TRACE(("leave cli_auth_pubkey-success")) |
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182 return 1; |
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183 } else { |
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184 TRACE(("leave cli_auth_pubkey-failure")) |
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185 return 0; |
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186 } |
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187 } |
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188 #endif /* Pubkey auth */ |