Mercurial > dropbear

annotate cli-auth.c @ 1692:1051e4eea25a

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Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents 6c16a05023aa
children bf1912d2d6e9
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 DROPBEAR_USE_PASSWORD_ENV
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64 if (getenv(DROPBEAR_PASSWORD_ENV)) {
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65 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD | AUTH_TYPE_INTERACT;
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66 }
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67 #endif
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68 if (cli_auth_try() == DROPBEAR_SUCCESS) {
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69 TRACE(("skipped initial none auth query"))
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70 /* Note that there will be two auth responses in-flight */
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71 cli_ses.ignore_next_auth_response = 1;
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72 }
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73 }
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74 #endif
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75 TRACE(("leave cli_auth_getmethods"))
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76 }
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77
43
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78 void recv_msg_userauth_banner() {
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79
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80 char* banner = NULL;
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81 unsigned int bannerlen;
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82 unsigned int i, linecount;
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83 int truncated = 0;
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84
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85 TRACE(("enter recv_msg_userauth_banner"))
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86 if (ses.authstate.authdone) {
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87 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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88 return;
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89 }
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90
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91 banner = buf_getstring(ses.payload, &bannerlen);
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92 buf_eatstring(ses.payload); /* The language string */
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93
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94 if (bannerlen > MAX_BANNER_SIZE) {
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95 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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96 truncated = 1;
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97 } else {
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98 cleantext(banner);
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99
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100 /* Limit to 24 lines */
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101 linecount = 1;
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102 for (i = 0; i < bannerlen; i++) {
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103 if (banner[i] == '\n') {
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104 if (linecount >= MAX_BANNER_LINES) {
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105 banner[i] = '\0';
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106 truncated = 1;
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107 break;
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108 }
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109 linecount++;
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110 }
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111 }
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112 fprintf(stderr, "%s\n", banner);
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113 }
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114
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115 if (truncated) {
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116 fprintf(stderr, "[Banner from the server is too long]\n");
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117 }
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118
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119 m_free(banner);
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120 TRACE(("leave recv_msg_userauth_banner"))
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121 }
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122
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123 /* This handles the message-specific types which
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124 * all have a value of 60. These are
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125 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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126 * SSH_MSG_USERAUTH_PK_OK, &
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127 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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128 void recv_msg_userauth_specific_60() {
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129
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130 #if DROPBEAR_CLI_PUBKEY_AUTH
249
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131 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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132 recv_msg_userauth_pk_ok();
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133 return;
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134 }
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135 #endif
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136
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137 #if DROPBEAR_CLI_INTERACT_AUTH
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138 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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139 recv_msg_userauth_info_request();
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140 return;
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141 }
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142 #endif
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143
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144 #if DROPBEAR_CLI_PASSWORD_AUTH
249
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145 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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146 /* Eventually there could be proper password-changing
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147 * support. However currently few servers seem to
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148 * implement it, and password auth is last-resort
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149 * regardless - keyboard-interactive is more likely
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150 * to be used anyway. */
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parents: 179
diff changeset
151 dropbear_close("Your password has expired.");
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152 }
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153 #endif
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154
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155 dropbear_exit("Unexpected userauth packet");
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156 }
43
942b22d7dd1c Banner printing
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157
33
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158 void recv_msg_userauth_failure() {
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159
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160 char * methods = NULL;
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161 char * tok = NULL;
33
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162 unsigned int methlen = 0;
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163 unsigned int partial = 0;
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164 unsigned int i = 0;
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165
165
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166 TRACE(("<- MSG_USERAUTH_FAILURE"))
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167 TRACE(("enter recv_msg_userauth_failure"))
33
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168
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169 if (ses.authstate.authdone) {
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170 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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171 return;
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172 }
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173
45
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174 if (cli_ses.state != USERAUTH_REQ_SENT) {
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175 /* Perhaps we should be more fatal? */
249
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176 dropbear_exit("Unexpected userauth failure");
45
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177 }
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178
883
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179 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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180 the "none" auth request, and then a response to the immediate auth request.
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181 We need to be careful handling them. */
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182 if (cli_ses.ignore_next_auth_response) {
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183 cli_ses.state = USERAUTH_REQ_SENT;
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184 cli_ses.ignore_next_auth_response = 0;
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185 TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
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186 return;
883
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187 } else {
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188 #if DROPBEAR_CLI_PUBKEY_AUTH
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189 /* If it was a pubkey auth request, we should cross that key
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190 * off the list. */
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diff changeset
191 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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diff changeset
192 cli_pubkeyfail();
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193 }
45
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194 #endif
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195
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196 #if DROPBEAR_CLI_INTERACT_AUTH
883
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197 /* If we get a failure message for keyboard interactive without
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198 * receiving any request info packet, then we don't bother trying
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199 * keyboard interactive again */
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200 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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201 && !cli_ses.interact_request_received) {
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202 TRACE(("setting auth_interact_failed = 1"))
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203 cli_ses.auth_interact_failed = 1;
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204 }
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205 #endif
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206 cli_ses.state = USERAUTH_FAIL_RCVD;
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207 cli_ses.lastauthtype = AUTH_TYPE_NONE;
249
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diff changeset
208 }
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209
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
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diff changeset
210 methods = buf_getstring(ses.payload, &methlen);
33
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211
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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diff changeset
212 partial = buf_getbool(ses.payload);
33
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213
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214 if (partial) {
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215 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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216 } else {
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217 ses.authstate.failcount++;
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218 }
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219
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
220 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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221
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222 ses.authstate.authdone=0;
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223 ses.authstate.authtypes=0;
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224
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225 /* Split with nulls rather than commas */
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226 for (i = 0; i < methlen; i++) {
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227 if (methods[i] == ',') {
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228 methods[i] = '\0';
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229 }
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230 }
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231
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232 tok = methods; /* tok stores the next method we'll compare */
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233 for (i = 0; i <= methlen; i++) {
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234 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
235 TRACE(("auth method '%s'", tok))
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236 #if DROPBEAR_CLI_PUBKEY_AUTH
33
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diff changeset
237 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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diff changeset
238 AUTH_METHOD_PUBKEY_LEN) == 0) {
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239 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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240 }
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241 #endif
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242 #if DROPBEAR_CLI_INTERACT_AUTH
249
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parents: 179
diff changeset
243 if (strncmp(AUTH_METHOD_INTERACT, tok,
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parents: 179
diff changeset
244 AUTH_METHOD_INTERACT_LEN) == 0) {
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diff changeset
245 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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parents: 179
diff changeset
246 }
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parents: 179
diff changeset
247 #endif
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248 #if DROPBEAR_CLI_PASSWORD_AUTH
33
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249 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
250 AUTH_METHOD_PASSWORD_LEN) == 0) {
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diff changeset
251 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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252 }
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253 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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diff changeset
254 tok = &methods[i+1]; /* Must make sure we don't use it after the
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diff changeset
255 last loop, since it'll point to something
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parents: 33
diff changeset
256 undefined */
33
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257 }
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258 }
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diff changeset
259
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
260 m_free(methods);
33
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261
165
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diff changeset
262 TRACE(("leave recv_msg_userauth_failure"))
33
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263 }
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264
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265 void recv_msg_userauth_success() {
883
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266 /* This function can validly get called multiple times
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diff changeset
267 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
268
165
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diff changeset
269 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
270 /* Note: in delayed-zlib mode, setting authdone here
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
271 * will enable compression in the transport layer */
33
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diff changeset
272 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
273 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
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diff changeset
274 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
275
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276 #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
277 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
278 #endif
33
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279 }
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diff changeset
280
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
281 int cli_auth_try() {
33
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diff changeset
282
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
Matt Johnston <matt@ucc.asn.au>
parents: 268
diff changeset
283 int finished = 0;
165
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284 TRACE(("enter cli_auth_try"))
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285
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286 CHECKCLEARTOWRITE();
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287
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288 /* Order to try is pubkey, interactive, password.
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289 * As soon as "finished" is set for one, we don't do any more. */
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290 #if DROPBEAR_CLI_PUBKEY_AUTH
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291 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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292 finished = cli_auth_pubkey();
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293 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
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294 }
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295 #endif
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296
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297 #if DROPBEAR_CLI_PASSWORD_AUTH
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298 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
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299 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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300 fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
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301 } else {
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302 cli_auth_password();
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303 finished = 1;
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304 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
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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 #if DROPBEAR_CLI_INTERACT_AUTH
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310 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
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311 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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312 fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
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313 } else {
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314 if (!cli_ses.auth_interact_failed) {
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315 cli_auth_interactive();
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316 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
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317 finished = 1;
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318 }
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319 }
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320 }
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321 #endif
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322
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323 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
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324
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325 if (finished) {
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326 TRACE(("leave cli_auth_try success"))
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327 return DROPBEAR_SUCCESS;
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328 }
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329 TRACE(("leave cli_auth_try failure"))
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330 return DROPBEAR_FAILURE;
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331 }
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332
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333 #if DROPBEAR_CLI_PASSWORD_AUTH || DROPBEAR_CLI_INTERACT_AUTH
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334 /* A helper for getpass() that exits if the user cancels. The returned
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335 * password is statically allocated by getpass() */
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336 char* getpass_or_cancel(const char* prompt)
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337 {
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338 char* password = NULL;
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339
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340 #if DROPBEAR_USE_PASSWORD_ENV
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341 /* Password provided in an environment var */
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342 password = getenv(DROPBEAR_PASSWORD_ENV);
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343 if (password)
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344 {
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345 return password;
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346 }
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347 #endif
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348
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349 password = getpass(prompt);
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350
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351 /* 0x03 is a ctrl-c character in the buffer. */
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352 if (password == NULL || strchr(password, '\3') != NULL) {
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353 dropbear_close("Interrupted.");
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354 }
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355 return password;
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356 }
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357 #endif