Mercurial > dropbear

annotate cli-auth.c @ 1147:809feaa9408f DROPBEAR_2015.68

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changelog and version 2015.68
author Matt Johnston <matt@ucc.asn.au>
date Sat, 08 Aug 2015 20:35:28 +0800
parents aaf576b27a10
children a8f4dade70e5
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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 /* We can't haven't two auth requests in-flight with delayed zlib mode
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56 since if the first one succeeds then the remote side will
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57 expect the second one to be compressed.
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58 Race described at
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59 http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/zlib-openssh.html
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60 */
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61 if (ses.keys->trans.algo_comp != DROPBEAR_COMP_ZLIB_DELAY) {
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62 ses.authstate.authtypes = AUTH_TYPE_PUBKEY;
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63 if (getenv(DROPBEAR_PASSWORD_ENV)) {
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64 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD | AUTH_TYPE_INTERACT;
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65 }
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66 if (cli_auth_try() == DROPBEAR_SUCCESS) {
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67 TRACE(("skipped initial none auth query"))
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68 /* Note that there will be two auth responses in-flight */
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69 cli_ses.ignore_next_auth_response = 1;
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70 }
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71 }
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72 #endif
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73 TRACE(("leave cli_auth_getmethods"))
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74 }
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75
43
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76 void recv_msg_userauth_banner() {
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77
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78 char* banner = NULL;
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79 unsigned int bannerlen;
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80 unsigned int i, linecount;
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81
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82 TRACE(("enter recv_msg_userauth_banner"))
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83 if (ses.authstate.authdone) {
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84 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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85 return;
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86 }
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87
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88 banner = buf_getstring(ses.payload, &bannerlen);
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89 buf_eatstring(ses.payload); /* The language string */
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90
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91 if (bannerlen > MAX_BANNER_SIZE) {
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92 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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93 goto out;
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94 }
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95
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96 cleantext(banner);
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97
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98 /* Limit to 25 lines */
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99 linecount = 1;
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100 for (i = 0; i < bannerlen; i++) {
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101 if (banner[i] == '\n') {
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102 if (linecount >= MAX_BANNER_LINES) {
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103 banner[i] = '\0';
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104 break;
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105 }
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106 linecount++;
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107 }
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108 }
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109
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110 fprintf(stderr, "%s\n", banner);
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111
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112 out:
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113 m_free(banner);
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114 TRACE(("leave recv_msg_userauth_banner"))
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115 }
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116
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117 /* This handles the message-specific types which
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118 * all have a value of 60. These are
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119 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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120 * SSH_MSG_USERAUTH_PK_OK, &
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121 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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122 void recv_msg_userauth_specific_60() {
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123
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124 #ifdef ENABLE_CLI_PUBKEY_AUTH
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125 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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126 recv_msg_userauth_pk_ok();
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127 return;
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128 }
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129 #endif
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130
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131 #ifdef ENABLE_CLI_INTERACT_AUTH
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132 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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133 recv_msg_userauth_info_request();
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134 return;
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135 }
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136 #endif
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137
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138 #ifdef ENABLE_CLI_PASSWORD_AUTH
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139 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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140 /* Eventually there could be proper password-changing
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141 * support. However currently few servers seem to
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142 * implement it, and password auth is last-resort
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143 * regardless - keyboard-interactive is more likely
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144 * to be used anyway. */
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diff changeset
145 dropbear_close("Your password has expired.");
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146 }
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diff changeset
147 #endif
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148
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diff changeset
149 dropbear_exit("Unexpected userauth packet");
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150 }
43
942b22d7dd1c Banner printing
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151
33
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152 void recv_msg_userauth_failure() {
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153
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154 char * methods = NULL;
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155 char * tok = NULL;
33
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156 unsigned int methlen = 0;
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157 unsigned int partial = 0;
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158 unsigned int i = 0;
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159
165
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160 TRACE(("<- MSG_USERAUTH_FAILURE"))
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161 TRACE(("enter recv_msg_userauth_failure"))
33
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162
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163 if (ses.authstate.authdone) {
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164 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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165 return;
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166 }
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167
45
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168 if (cli_ses.state != USERAUTH_REQ_SENT) {
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169 /* Perhaps we should be more fatal? */
249
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170 dropbear_exit("Unexpected userauth failure");
45
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171 }
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172
883
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173 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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174 the "none" auth request, and then a response to the immediate auth request.
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175 We need to be careful handling them. */
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176 if (cli_ses.ignore_next_auth_response) {
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177 cli_ses.state = USERAUTH_REQ_SENT;
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178 cli_ses.ignore_next_auth_response = 0;
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179 TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
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180 return;
883
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181 } else {
68
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182 #ifdef ENABLE_CLI_PUBKEY_AUTH
883
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183 /* If it was a pubkey auth request, we should cross that key
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184 * off the list. */
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185 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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186 cli_pubkeyfail();
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187 }
45
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188 #endif
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189
249
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190 #ifdef ENABLE_CLI_INTERACT_AUTH
883
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191 /* If we get a failure message for keyboard interactive without
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192 * receiving any request info packet, then we don't bother trying
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193 * keyboard interactive again */
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194 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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195 && !cli_ses.interact_request_received) {
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196 TRACE(("setting auth_interact_failed = 1"))
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197 cli_ses.auth_interact_failed = 1;
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198 }
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199 #endif
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200 cli_ses.state = USERAUTH_FAIL_RCVD;
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201 cli_ses.lastauthtype = AUTH_TYPE_NONE;
249
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diff changeset
202 }
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203
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
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diff changeset
204 methods = buf_getstring(ses.payload, &methlen);
33
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205
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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diff changeset
206 partial = buf_getbool(ses.payload);
33
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207
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208 if (partial) {
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209 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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210 } else {
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211 ses.authstate.failcount++;
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212 }
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213
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
214 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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215
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216 ses.authstate.authdone=0;
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217 ses.authstate.authtypes=0;
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218
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219 /* Split with nulls rather than commas */
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220 for (i = 0; i < methlen; i++) {
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221 if (methods[i] == ',') {
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222 methods[i] = '\0';
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223 }
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224 }
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225
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226 tok = methods; /* tok stores the next method we'll compare */
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227 for (i = 0; i <= methlen; i++) {
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228 if (methods[i] == '\0') {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
229 TRACE(("auth method '%s'", tok))
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
230 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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diff changeset
231 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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diff changeset
232 AUTH_METHOD_PUBKEY_LEN) == 0) {
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diff changeset
233 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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234 }
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235 #endif
249
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diff changeset
236 #ifdef ENABLE_CLI_INTERACT_AUTH
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diff changeset
237 if (strncmp(AUTH_METHOD_INTERACT, tok,
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parents: 179
diff changeset
238 AUTH_METHOD_INTERACT_LEN) == 0) {
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diff changeset
239 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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diff changeset
240 }
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diff changeset
241 #endif
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
242 #ifdef ENABLE_CLI_PASSWORD_AUTH
33
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243 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
244 AUTH_METHOD_PASSWORD_LEN) == 0) {
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245 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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246 }
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247 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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diff changeset
248 tok = &methods[i+1]; /* Must make sure we don't use it after the
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parents: 33
diff changeset
249 last loop, since it'll point to something
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
250 undefined */
33
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251 }
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252 }
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253
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
254 m_free(methods);
33
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diff changeset
255
165
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diff changeset
256 TRACE(("leave recv_msg_userauth_failure"))
33
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257 }
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258
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259 void recv_msg_userauth_success() {
883
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260 /* This function can validly get called multiple times
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diff changeset
261 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
262
165
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parents: 114
diff changeset
263 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 441
diff changeset
264 /* Note: in delayed-zlib mode, setting authdone here
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
265 * will enable compression in the transport layer */
33
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diff changeset
266 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
267 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
efbaf6b03837 added keyboard-interactive client support
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diff changeset
268 cli_ses.lastauthtype = AUTH_TYPE_NONE;
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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parents: 545
diff changeset
269
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parents: 545
diff changeset
270 #ifdef ENABLE_CLI_PUBKEY_AUTH
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parents: 545
diff changeset
271 cli_auth_pubkey_cleanup();
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diff changeset
272 #endif
33
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273 }
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274
734
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
Matt Johnston <matt@ucc.asn.au>
parents: 732
diff changeset
275 int cli_auth_try() {
33
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diff changeset
276
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
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parents: 268
diff changeset
277 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
278 TRACE(("enter cli_auth_try"))
33
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279
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diff changeset
280 CHECKCLEARTOWRITE();
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diff changeset
281
249
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diff changeset
282 /* Order to try is pubkey, interactive, password.
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diff changeset
283 * 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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parents: 45
diff changeset
284 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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diff changeset
285 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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diff changeset
286 finished = cli_auth_pubkey();
45
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287 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
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288 }
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289 #endif
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290
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291 #ifdef ENABLE_CLI_PASSWORD_AUTH
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292 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
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293 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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294 fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
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295 } else {
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296 cli_auth_password();
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297 finished = 1;
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298 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
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299 }
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300 }
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301 #endif
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302
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303 #ifdef ENABLE_CLI_INTERACT_AUTH
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304 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
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305 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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306 fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
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307 } else {
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308 if (!cli_ses.auth_interact_failed) {
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309 cli_auth_interactive();
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310 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
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311 finished = 1;
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312 }
249
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313 }
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314 }
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315 #endif
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316
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317 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
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318
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319 if (finished) {
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320 TRACE(("leave cli_auth_try success"))
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321 return DROPBEAR_SUCCESS;
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322 }
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323 TRACE(("leave cli_auth_try failure"))
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324 return DROPBEAR_FAILURE;
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325 }
268
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326
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327 /* A helper for getpass() that exits if the user cancels. The returned
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328 * password is statically allocated by getpass() */
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329 char* getpass_or_cancel(char* prompt)
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330 {
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331 char* password = NULL;
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332
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333 #ifdef DROPBEAR_PASSWORD_ENV
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334 /* Password provided in an environment var */
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335 password = getenv(DROPBEAR_PASSWORD_ENV);
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336 if (password)
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337 {
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338 return password;
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339 }
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340 #endif
268
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341
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342 password = getpass(prompt);
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343
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344 /* 0x03 is a ctrl-c character in the buffer. */
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345 if (password == NULL || strchr(password, '\3') != NULL) {
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346 dropbear_close("Interrupted.");
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347 }
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348 return password;
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349 }