annotate cli-auth.c @ 883:ff597bf2cfb0

DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
author Matt Johnston <matt@ucc.asn.au>
date Fri, 17 Jan 2014 21:39:27 +0800
parents 619b1ed837fd
children 7032deca6b90
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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
33
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26 #include "includes.h"
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27 #include "session.h"
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28 #include "auth.h"
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29 #include "dbutil.h"
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30 #include "buffer.h"
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31 #include "ssh.h"
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32 #include "packet.h"
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33 #include "runopts.h"
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34
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35 void cli_authinitialise() {
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36
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37 memset(&ses.authstate, 0, sizeof(ses.authstate));
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38 }
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39
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40
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41 /* Send a "none" auth request to get available methods */
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42 void cli_auth_getmethods() {
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43 TRACE(("enter cli_auth_getmethods"))
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44 CHECKCLEARTOWRITE();
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45 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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46 buf_putstring(ses.writepayload, cli_opts.username,
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47 strlen(cli_opts.username));
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48 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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49 SSH_SERVICE_CONNECTION_LEN);
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50 buf_putstring(ses.writepayload, "none", 4); /* 'none' method */
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51
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52 encrypt_packet();
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53
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54 #ifdef DROPBEAR_CLI_IMMEDIATE_AUTH
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55 ses.authstate.authtypes = AUTH_TYPE_PUBKEY;
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56 if (getenv(DROPBEAR_PASSWORD_ENV)) {
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57 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD | AUTH_TYPE_INTERACT;
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58 }
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59 if (cli_auth_try() == DROPBEAR_SUCCESS) {
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60 TRACE(("skipped initial none auth query"))
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61 /* Note that there will be two auth responses in-flight */
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62 cli_ses.ignore_next_auth_response = 1;
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63 }
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64 #endif
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65 TRACE(("leave cli_auth_getmethods"))
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66 }
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67
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68 void recv_msg_userauth_banner() {
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69
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70 unsigned char* banner = NULL;
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71 unsigned int bannerlen;
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72 unsigned int i, linecount;
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73
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74 TRACE(("enter recv_msg_userauth_banner"))
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75 if (ses.authstate.authdone) {
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76 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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77 return;
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78 }
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79
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80 banner = buf_getstring(ses.payload, &bannerlen);
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81 buf_eatstring(ses.payload); /* The language string */
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82
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83 if (bannerlen > MAX_BANNER_SIZE) {
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84 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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85 goto out;
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86 }
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87
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88 cleantext(banner);
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89
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90 /* Limit to 25 lines */
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91 linecount = 1;
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92 for (i = 0; i < bannerlen; i++) {
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93 if (banner[i] == '\n') {
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94 if (linecount >= MAX_BANNER_LINES) {
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95 banner[i] = '\0';
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96 break;
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97 }
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98 linecount++;
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99 }
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100 }
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101
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102 fprintf(stderr, "%s\n", banner);
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103
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104 out:
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105 m_free(banner);
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106 TRACE(("leave recv_msg_userauth_banner"))
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107 }
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108
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109 /* This handles the message-specific types which
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110 * all have a value of 60. These are
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111 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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112 * SSH_MSG_USERAUTH_PK_OK, &
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113 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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114 void recv_msg_userauth_specific_60() {
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115
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116 #ifdef ENABLE_CLI_PUBKEY_AUTH
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117 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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118 recv_msg_userauth_pk_ok();
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119 return;
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120 }
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121 #endif
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122
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123 #ifdef ENABLE_CLI_INTERACT_AUTH
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124 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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125 recv_msg_userauth_info_request();
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126 return;
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127 }
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128 #endif
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129
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130 #ifdef ENABLE_CLI_PASSWORD_AUTH
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131 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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132 /* Eventually there could be proper password-changing
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133 * support. However currently few servers seem to
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134 * implement it, and password auth is last-resort
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135 * regardless - keyboard-interactive is more likely
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136 * to be used anyway. */
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137 dropbear_close("Your password has expired.");
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138 }
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139 #endif
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140
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141 dropbear_exit("Unexpected userauth packet");
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142 }
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143
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144 void recv_msg_userauth_failure() {
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145
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146 unsigned char * methods = NULL;
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147 unsigned char * tok = NULL;
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148 unsigned int methlen = 0;
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149 unsigned int partial = 0;
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150 unsigned int i = 0;
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151
165
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152 TRACE(("<- MSG_USERAUTH_FAILURE"))
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153 TRACE(("enter recv_msg_userauth_failure"))
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154
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155 if (ses.authstate.authdone) {
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156 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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157 return;
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158 }
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159
45
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160 if (cli_ses.state != USERAUTH_REQ_SENT) {
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161 /* Perhaps we should be more fatal? */
249
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diff changeset
162 dropbear_exit("Unexpected userauth failure");
45
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163 }
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164
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165 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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166 the "none" auth request, and then a response to the immediate auth request.
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167 We need to be careful handling them. */
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168 if (cli_ses.ignore_next_auth_response) {
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169 TRACE(("ignore next response, state set to USERAUTH_REQ_SENT"))
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170 cli_ses.state = USERAUTH_REQ_SENT;
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171 } else {
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172 cli_ses.state = USERAUTH_FAIL_RCVD;
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173 cli_ses.lastauthtype = AUTH_TYPE_NONE;
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174 #ifdef ENABLE_CLI_PUBKEY_AUTH
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175 /* If it was a pubkey auth request, we should cross that key
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176 * off the list. */
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177 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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178 cli_pubkeyfail();
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179 }
45
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180 #endif
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181
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182 #ifdef ENABLE_CLI_INTERACT_AUTH
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183 /* If we get a failure message for keyboard interactive without
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184 * receiving any request info packet, then we don't bother trying
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185 * keyboard interactive again */
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186 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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187 && !cli_ses.interact_request_received) {
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188 TRACE(("setting auth_interact_failed = 1"))
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189 cli_ses.auth_interact_failed = 1;
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190 }
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191 #endif
249
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192 }
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diff changeset
193
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194 cli_ses.ignore_next_auth_response = 0;
249
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195
33
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196 methods = buf_getstring(ses.payload, &methlen);
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197
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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diff changeset
198 partial = buf_getbool(ses.payload);
33
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199
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200 if (partial) {
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201 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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202 } else {
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diff changeset
203 ses.authstate.failcount++;
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204 }
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205
165
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206 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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207
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208 ses.authstate.authdone=0;
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209 ses.authstate.authtypes=0;
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210
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211 /* Split with nulls rather than commas */
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212 for (i = 0; i < methlen; i++) {
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213 if (methods[i] == ',') {
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214 methods[i] = '\0';
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215 }
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216 }
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217
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218 tok = methods; /* tok stores the next method we'll compare */
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219 for (i = 0; i <= methlen; i++) {
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220 if (methods[i] == '\0') {
165
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diff changeset
221 TRACE(("auth method '%s'", tok))
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
222 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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223 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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224 AUTH_METHOD_PUBKEY_LEN) == 0) {
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225 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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226 }
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227 #endif
249
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diff changeset
228 #ifdef ENABLE_CLI_INTERACT_AUTH
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diff changeset
229 if (strncmp(AUTH_METHOD_INTERACT, tok,
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diff changeset
230 AUTH_METHOD_INTERACT_LEN) == 0) {
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diff changeset
231 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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diff changeset
232 }
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diff changeset
233 #endif
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
234 #ifdef ENABLE_CLI_PASSWORD_AUTH
33
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235 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
236 AUTH_METHOD_PASSWORD_LEN) == 0) {
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diff changeset
237 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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238 }
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239 #endif
34
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diff changeset
240 tok = &methods[i+1]; /* Must make sure we don't use it after the
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diff changeset
241 last loop, since it'll point to something
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diff changeset
242 undefined */
33
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243 }
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244 }
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245
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
246 m_free(methods);
33
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247
165
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diff changeset
248 TRACE(("leave recv_msg_userauth_failure"))
33
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249 }
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250
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251 void recv_msg_userauth_success() {
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252 /* This function can validly get called multiple times
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diff changeset
253 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
254
165
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diff changeset
255 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
256 /* Note: in delayed-zlib mode, setting authdone here
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 441
diff changeset
257 * will enable compression in the transport layer */
33
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diff changeset
258 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
259 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
efbaf6b03837 added keyboard-interactive client support
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diff changeset
260 cli_ses.lastauthtype = AUTH_TYPE_NONE;
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 545
diff changeset
261
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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diff changeset
262 #ifdef ENABLE_CLI_PUBKEY_AUTH
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diff changeset
263 cli_auth_pubkey_cleanup();
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diff changeset
264 #endif
33
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265 }
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diff changeset
266
734
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
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diff changeset
267 int cli_auth_try() {
33
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diff changeset
268
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
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parents: 268
diff changeset
269 int finished = 0;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
270 TRACE(("enter cli_auth_try"))
33
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271
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diff changeset
272 CHECKCLEARTOWRITE();
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diff changeset
273
249
efbaf6b03837 added keyboard-interactive client support
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diff changeset
274 /* Order to try is pubkey, interactive, password.
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diff changeset
275 * As soon as "finished" is set for one, we don't do any more. */
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
276 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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diff changeset
277 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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diff changeset
278 finished = cli_auth_pubkey();
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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diff changeset
279 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
33
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280 }
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diff changeset
281 #endif
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diff changeset
282
732
2e5f2bc60e40 Try password before interactive - bit of a hack
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parents: 730
diff changeset
283 #ifdef ENABLE_CLI_PASSWORD_AUTH
734
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
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diff changeset
284 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
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diff changeset
285 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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diff changeset
286 fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
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diff changeset
287 } else {
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288 cli_auth_password();
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289 finished = 1;
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290 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
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291 }
732
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292 }
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293 #endif
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294
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295 #ifdef ENABLE_CLI_INTERACT_AUTH
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296 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
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297 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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298 fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
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299 } else {
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300 if (!cli_ses.auth_interact_failed) {
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301 cli_auth_interactive();
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302 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
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303 finished = 1;
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304 }
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305 }
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306 }
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307 #endif
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308
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309 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
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310
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311 if (finished) {
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312 TRACE(("leave cli_auth_try success"))
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313 return DROPBEAR_SUCCESS;
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314 }
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315 TRACE(("leave cli_auth_try failure"))
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316 return DROPBEAR_FAILURE;
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317 }
268
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318
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319 /* A helper for getpass() that exits if the user cancels. The returned
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320 * password is statically allocated by getpass() */
334
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321 char* getpass_or_cancel(char* prompt)
268
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322 {
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323 char* password = NULL;
441
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324
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325 #ifdef DROPBEAR_PASSWORD_ENV
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326 /* Password provided in an environment var */
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327 password = getenv(DROPBEAR_PASSWORD_ENV);
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328 if (password)
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329 {
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330 return password;
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331 }
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332 #endif
268
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333
334
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334 password = getpass(prompt);
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335
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336 /* 0x03 is a ctrl-c character in the buffer. */
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337 if (password == NULL || strchr(password, '\3') != NULL) {
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338 dropbear_close("Interrupted.");
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339 }
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340 return password;
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341 }