Mercurial > dropbear

annotate cli-auth.c @ 1297:5abbecdecba4

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Add generated header default_options.h to version control. This is a workaround since I cannot figure how to get dependencies to work properly with "make -j"
author Matt Johnston <matt@ucc.asn.au>
date Wed, 04 May 2016 17:59:34 +0200
parents 6959c88c8f13
children 06d52bcb8094
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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 #if 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
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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 int truncated = 0;
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82
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83 TRACE(("enter recv_msg_userauth_banner"))
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84 if (ses.authstate.authdone) {
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85 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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86 return;
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87 }
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88
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89 banner = buf_getstring(ses.payload, &bannerlen);
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90 buf_eatstring(ses.payload); /* The language string */
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91
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92 if (bannerlen > MAX_BANNER_SIZE) {
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93 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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94 truncated = 1;
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95 } else {
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96 cleantext(banner);
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97
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98 /* Limit to 24 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 truncated = 1;
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105 break;
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106 }
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107 linecount++;
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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
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113 if (truncated) {
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114 fprintf(stderr, "[Banner from the server is too long]\n");
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115 }
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116
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117 m_free(banner);
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118 TRACE(("leave recv_msg_userauth_banner"))
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119 }
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120
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121 /* This handles the message-specific types which
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122 * all have a value of 60. These are
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123 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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124 * SSH_MSG_USERAUTH_PK_OK, &
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125 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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126 void recv_msg_userauth_specific_60() {
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127
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128 #if DROPBEAR_CLI_PUBKEY_AUTH
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129 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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130 recv_msg_userauth_pk_ok();
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131 return;
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132 }
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133 #endif
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134
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135 #if DROPBEAR_CLI_INTERACT_AUTH
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136 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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137 recv_msg_userauth_info_request();
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138 return;
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139 }
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140 #endif
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141
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142 #if DROPBEAR_CLI_PASSWORD_AUTH
249
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diff changeset
143 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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144 /* Eventually there could be proper password-changing
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145 * support. However currently few servers seem to
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diff changeset
146 * implement it, and password auth is last-resort
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147 * regardless - keyboard-interactive is more likely
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148 * to be used anyway. */
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parents: 179
diff changeset
149 dropbear_close("Your password has expired.");
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150 }
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diff changeset
151 #endif
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152
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diff changeset
153 dropbear_exit("Unexpected userauth packet");
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154 }
43
942b22d7dd1c Banner printing
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155
33
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156 void recv_msg_userauth_failure() {
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157
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158 char * methods = NULL;
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159 char * tok = NULL;
33
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160 unsigned int methlen = 0;
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161 unsigned int partial = 0;
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162 unsigned int i = 0;
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163
165
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diff changeset
164 TRACE(("<- MSG_USERAUTH_FAILURE"))
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165 TRACE(("enter recv_msg_userauth_failure"))
33
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166
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167 if (ses.authstate.authdone) {
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168 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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169 return;
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170 }
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171
45
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172 if (cli_ses.state != USERAUTH_REQ_SENT) {
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173 /* Perhaps we should be more fatal? */
249
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174 dropbear_exit("Unexpected userauth failure");
45
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175 }
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176
883
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177 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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178 the "none" auth request, and then a response to the immediate auth request.
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179 We need to be careful handling them. */
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180 if (cli_ses.ignore_next_auth_response) {
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181 cli_ses.state = USERAUTH_REQ_SENT;
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182 cli_ses.ignore_next_auth_response = 0;
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183 TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
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184 return;
883
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185 } else {
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750ec4ec4cbe Convert #ifdef to #if, other build changes
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186 #if DROPBEAR_CLI_PUBKEY_AUTH
883
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187 /* If it was a pubkey auth request, we should cross that key
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188 * off the list. */
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diff changeset
189 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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diff changeset
190 cli_pubkeyfail();
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diff changeset
191 }
45
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diff changeset
192 #endif
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diff changeset
193
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194 #if DROPBEAR_CLI_INTERACT_AUTH
883
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195 /* If we get a failure message for keyboard interactive without
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196 * receiving any request info packet, then we don't bother trying
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diff changeset
197 * keyboard interactive again */
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diff changeset
198 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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diff changeset
199 && !cli_ses.interact_request_received) {
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200 TRACE(("setting auth_interact_failed = 1"))
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diff changeset
201 cli_ses.auth_interact_failed = 1;
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202 }
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diff changeset
203 #endif
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diff changeset
204 cli_ses.state = USERAUTH_FAIL_RCVD;
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diff changeset
205 cli_ses.lastauthtype = AUTH_TYPE_NONE;
249
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diff changeset
206 }
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parents: 179
diff changeset
207
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
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diff changeset
208 methods = buf_getstring(ses.payload, &methlen);
33
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209
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
210 partial = buf_getbool(ses.payload);
33
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211
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212 if (partial) {
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diff changeset
213 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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214 } else {
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diff changeset
215 ses.authstate.failcount++;
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216 }
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217
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
218 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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219
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220 ses.authstate.authdone=0;
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diff changeset
221 ses.authstate.authtypes=0;
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222
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223 /* Split with nulls rather than commas */
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diff changeset
224 for (i = 0; i < methlen; i++) {
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diff changeset
225 if (methods[i] == ',') {
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diff changeset
226 methods[i] = '\0';
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parents:
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227 }
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228 }
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229
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230 tok = methods; /* tok stores the next method we'll compare */
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parents:
diff changeset
231 for (i = 0; i <= methlen; i++) {
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diff changeset
232 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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parents: 114
diff changeset
233 TRACE(("auth method '%s'", tok))
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750ec4ec4cbe Convert #ifdef to #if, other build changes
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diff changeset
234 #if DROPBEAR_CLI_PUBKEY_AUTH
33
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parents:
diff changeset
235 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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parents:
diff changeset
236 AUTH_METHOD_PUBKEY_LEN) == 0) {
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diff changeset
237 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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diff changeset
238 }
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diff changeset
239 #endif
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diff changeset
240 #if DROPBEAR_CLI_INTERACT_AUTH
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
241 if (strncmp(AUTH_METHOD_INTERACT, tok,
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
242 AUTH_METHOD_INTERACT_LEN) == 0) {
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
243 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
244 }
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parents: 179
diff changeset
245 #endif
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diff changeset
246 #if DROPBEAR_CLI_PASSWORD_AUTH
33
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diff changeset
247 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
248 AUTH_METHOD_PASSWORD_LEN) == 0) {
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diff changeset
249 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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diff changeset
250 }
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diff changeset
251 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
252 tok = &methods[i+1]; /* Must make sure we don't use it after the
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
253 last loop, since it'll point to something
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
254 undefined */
33
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255 }
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parents:
diff changeset
256 }
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diff changeset
257
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
258 m_free(methods);
33
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diff changeset
259
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
260 TRACE(("leave recv_msg_userauth_failure"))
33
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261 }
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262
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diff changeset
263 void recv_msg_userauth_success() {
883
ff597bf2cfb0 DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
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diff changeset
264 /* This function can validly get called multiple times
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diff changeset
265 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
266
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 114
diff changeset
267 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
268 /* 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
269 * will enable compression in the transport layer */
33
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diff changeset
270 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
271 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
272 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
273
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diff changeset
274 #if DROPBEAR_CLI_PUBKEY_AUTH
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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parents: 545
diff changeset
275 cli_auth_pubkey_cleanup();
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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parents: 545
diff changeset
276 #endif
33
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277 }
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diff changeset
278
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
279 int cli_auth_try() {
33
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diff changeset
280
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
Matt Johnston <matt@ucc.asn.au>
parents: 268
diff changeset
281 int finished = 0;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 114
diff changeset
282 TRACE(("enter cli_auth_try"))
33
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diff changeset
283
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diff changeset
284 CHECKCLEARTOWRITE();
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parents:
diff changeset
285
249
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286 /* Order to try is pubkey, interactive, password.
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287 * As soon as "finished" is set for one, we don't do any more. */
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288 #if DROPBEAR_CLI_PUBKEY_AUTH
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289 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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290 finished = cli_auth_pubkey();
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291 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
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292 }
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293 #endif
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294
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295 #if DROPBEAR_CLI_PASSWORD_AUTH
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296 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
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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 password auth unencrypted.\n");
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299 } else {
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300 cli_auth_password();
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301 finished = 1;
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302 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
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303 }
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304 }
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305 #endif
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306
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307 #if DROPBEAR_CLI_INTERACT_AUTH
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308 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
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309 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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310 fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
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311 } else {
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312 if (!cli_ses.auth_interact_failed) {
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313 cli_auth_interactive();
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314 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
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315 finished = 1;
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316 }
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317 }
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318 }
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319 #endif
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320
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321 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
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322
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323 if (finished) {
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324 TRACE(("leave cli_auth_try success"))
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325 return DROPBEAR_SUCCESS;
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326 }
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327 TRACE(("leave cli_auth_try failure"))
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328 return DROPBEAR_FAILURE;
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329 }
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330
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331 #if DROPBEAR_CLI_PASSWORD_AUTH || DROPBEAR_CLI_INTERACT_AUTH
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332 /* A helper for getpass() that exits if the user cancels. The returned
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333 * password is statically allocated by getpass() */
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334 char* getpass_or_cancel(char* prompt)
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335 {
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336 char* password = NULL;
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337
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338 #ifdef DROPBEAR_PASSWORD_ENV
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339 /* Password provided in an environment var */
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340 password = getenv(DROPBEAR_PASSWORD_ENV);
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341 if (password)
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342 {
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343 return password;
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344 }
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345 #endif
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346
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347 password = getpass(prompt);
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348
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349 /* 0x03 is a ctrl-c character in the buffer. */
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350 if (password == NULL || strchr(password, '\3') != NULL) {
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351 dropbear_close("Interrupted.");
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352 }
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353 return password;
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354 }
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355 #endif