Mercurial > dropbear

annotate cli-auth.c @ 1884:75d6a9faf919

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Merge pull request #151 from HansH111/pubkeyinfo
author Matt Johnston <matt@ucc.asn.au>
date Wed, 16 Mar 2022 10:43:24 +0800
parents d512da7b1198
children 62e4baa059c3
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 /* Send a "none" auth request to get available methods */
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36 void cli_auth_getmethods() {
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37 TRACE(("enter cli_auth_getmethods"))
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38 CHECKCLEARTOWRITE();
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39 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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40 buf_putstring(ses.writepayload, cli_opts.username,
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41 strlen(cli_opts.username));
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42 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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43 SSH_SERVICE_CONNECTION_LEN);
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44 buf_putstring(ses.writepayload, "none", 4); /* 'none' method */
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45
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46 encrypt_packet();
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47
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48 #if DROPBEAR_CLI_IMMEDIATE_AUTH
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49 /* We can't haven't two auth requests in-flight with delayed zlib mode
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50 since if the first one succeeds then the remote side will
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51 expect the second one to be compressed.
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52 Race described at
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53 http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/zlib-openssh.html
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54 */
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55 if (ses.keys->trans.algo_comp != DROPBEAR_COMP_ZLIB_DELAY) {
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56 ses.authstate.authtypes = AUTH_TYPE_PUBKEY;
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57 #if DROPBEAR_USE_PASSWORD_ENV
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58 if (getenv(DROPBEAR_PASSWORD_ENV)) {
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59 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD | AUTH_TYPE_INTERACT;
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60 }
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61 #endif
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62 if (cli_auth_try() == DROPBEAR_SUCCESS) {
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63 TRACE(("skipped initial none auth query"))
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64 /* Note that there will be two auth responses in-flight */
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65 cli_ses.ignore_next_auth_response = 1;
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66 }
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67 }
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68 #endif
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69 TRACE(("leave cli_auth_getmethods"))
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70 }
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71
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72 void recv_msg_userauth_banner() {
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73
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74 char* banner = NULL;
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75 unsigned int bannerlen;
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76 unsigned int i, linecount;
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77 int truncated = 0;
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78
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79 TRACE(("enter recv_msg_userauth_banner"))
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80 if (ses.authstate.authdone) {
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81 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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82 return;
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83 }
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84
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85 banner = buf_getstring(ses.payload, &bannerlen);
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86 buf_eatstring(ses.payload); /* The language string */
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87
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88 if (cli_opts.quiet == 0) {
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89 if (bannerlen > MAX_BANNER_SIZE) {
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90 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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91 truncated = 1;
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92 } else {
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93 cleantext(banner);
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94
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95 /* Limit to 24 lines */
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96 linecount = 1;
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97 for (i = 0; i < bannerlen; i++) {
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98 if (banner[i] == '\n') {
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99 if (linecount >= MAX_BANNER_LINES) {
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100 banner[i] = '\0';
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101 truncated = 1;
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102 break;
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103 }
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104 linecount++;
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105 }
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106 }
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107 fprintf(stderr, "%s\n", banner);
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108 }
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109
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110 if (truncated) {
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111 fprintf(stderr, "[Banner from the server is too long]\n");
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112 }
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113 }
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114 m_free(banner);
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115 TRACE(("leave recv_msg_userauth_banner"))
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116 }
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117
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118 /* This handles the message-specific types which
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119 * all have a value of 60. These are
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120 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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121 * SSH_MSG_USERAUTH_PK_OK, &
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122 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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123 void recv_msg_userauth_specific_60() {
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124
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125 #if DROPBEAR_CLI_PUBKEY_AUTH
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126 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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127 recv_msg_userauth_pk_ok();
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128 return;
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129 }
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130 #endif
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131
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132 #if DROPBEAR_CLI_INTERACT_AUTH
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133 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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134 recv_msg_userauth_info_request();
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135 return;
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136 }
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137 #endif
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138
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139 #if DROPBEAR_CLI_PASSWORD_AUTH
249
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140 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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141 /* Eventually there could be proper password-changing
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parents: 179
diff changeset
142 * support. However currently few servers seem to
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143 * implement it, and password auth is last-resort
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144 * regardless - keyboard-interactive is more likely
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diff changeset
145 * to be used anyway. */
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parents: 179
diff changeset
146 dropbear_close("Your password has expired.");
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parents: 179
diff changeset
147 }
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parents: 179
diff changeset
148 #endif
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149
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diff changeset
150 dropbear_exit("Unexpected userauth packet");
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151 }
43
942b22d7dd1c Banner printing
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diff changeset
152
33
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153 void recv_msg_userauth_failure() {
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154
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155 char * methods = NULL;
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156 char * tok = NULL;
33
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157 unsigned int methlen = 0;
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158 unsigned int partial = 0;
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159 unsigned int i = 0;
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160
165
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diff changeset
161 TRACE(("<- MSG_USERAUTH_FAILURE"))
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162 TRACE(("enter recv_msg_userauth_failure"))
33
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163
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164 if (ses.authstate.authdone) {
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165 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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166 return;
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167 }
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168
45
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169 if (cli_ses.state != USERAUTH_REQ_SENT) {
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170 /* Perhaps we should be more fatal? */
249
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171 dropbear_exit("Unexpected userauth failure");
45
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172 }
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173
883
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174 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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175 the "none" auth request, and then a response to the immediate auth request.
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176 We need to be careful handling them. */
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177 if (cli_ses.ignore_next_auth_response) {
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178 cli_ses.state = USERAUTH_REQ_SENT;
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179 cli_ses.ignore_next_auth_response = 0;
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180 TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
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181 return;
883
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182 } else {
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183 #if DROPBEAR_CLI_PUBKEY_AUTH
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184 /* If it was a pubkey auth request, we should cross that key
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185 * off the list. */
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diff changeset
186 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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diff changeset
187 cli_pubkeyfail();
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188 }
45
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189 #endif
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diff changeset
190
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191 #if DROPBEAR_CLI_INTERACT_AUTH
883
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192 /* If we get a failure message for keyboard interactive without
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193 * receiving any request info packet, then we don't bother trying
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194 * keyboard interactive again */
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195 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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196 && !cli_ses.interact_request_received) {
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197 TRACE(("setting auth_interact_failed = 1"))
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198 cli_ses.auth_interact_failed = 1;
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199 }
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200 #endif
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201 cli_ses.state = USERAUTH_FAIL_RCVD;
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202 cli_ses.lastauthtype = AUTH_TYPE_NONE;
249
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diff changeset
203 }
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204
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
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diff changeset
205 methods = buf_getstring(ses.payload, &methlen);
33
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206
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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diff changeset
207 partial = buf_getbool(ses.payload);
33
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208
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209 if (partial) {
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210 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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211 } else {
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212 ses.authstate.failcount++;
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213 }
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214
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
215 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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216
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217 ses.authstate.authdone=0;
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218 ses.authstate.authtypes=0;
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219
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220 /* Split with nulls rather than commas */
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diff changeset
221 for (i = 0; i < methlen; i++) {
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222 if (methods[i] == ',') {
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diff changeset
223 methods[i] = '\0';
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224 }
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225 }
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226
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227 tok = methods; /* tok stores the next method we'll compare */
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228 for (i = 0; i <= methlen; i++) {
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229 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
230 TRACE(("auth method '%s'", tok))
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231 #if DROPBEAR_CLI_PUBKEY_AUTH
33
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diff changeset
232 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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diff changeset
233 AUTH_METHOD_PUBKEY_LEN) == 0) {
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234 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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235 }
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diff changeset
236 #endif
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diff changeset
237 #if DROPBEAR_CLI_INTERACT_AUTH
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
238 if (strncmp(AUTH_METHOD_INTERACT, tok,
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parents: 179
diff changeset
239 AUTH_METHOD_INTERACT_LEN) == 0) {
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parents: 179
diff changeset
240 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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parents: 179
diff changeset
241 }
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parents: 179
diff changeset
242 #endif
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243 #if DROPBEAR_CLI_PASSWORD_AUTH
33
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244 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
245 AUTH_METHOD_PASSWORD_LEN) == 0) {
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246 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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247 }
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248 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
249 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
250 last loop, since it'll point to something
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
251 undefined */
33
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252 }
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253 }
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254
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
255 m_free(methods);
33
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256
165
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diff changeset
257 TRACE(("leave recv_msg_userauth_failure"))
33
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258 }
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259
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260 void recv_msg_userauth_success() {
883
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261 /* This function can validly get called multiple times
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diff changeset
262 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
263
165
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diff changeset
264 TRACE(("received msg_userauth_success"))
1821
df8d8ec1801c added option to disable trivial auth methods (#128)
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parents: 1781
diff changeset
265 if (cli_opts.disable_trivial_auth && cli_ses.is_trivial_auth) {
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parents: 1781
diff changeset
266 dropbear_exit("trivial authentication not allowed");
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parents: 1781
diff changeset
267 }
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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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();
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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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parents:
diff changeset
280
300
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281 int finished = 0;
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282 TRACE(("enter cli_auth_try"))
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283
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284 CHECKCLEARTOWRITE();
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285
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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(const char* prompt)
268
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335 {
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336 char* password = NULL;
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337
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338 #if DROPBEAR_USE_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
268
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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