Mercurial > dropbear

annotate cli-auth.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents aaf576b27a10
children c6346c63281b
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 #ifdef DROPBEAR_CLI_IMMEDIATE_AUTH
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55 /* We can't haven't two auth requests in-flight with delayed zlib mode
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56 since if the first one succeeds then the remote side will
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57 expect the second one to be compressed.
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58 Race described at
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59 http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/zlib-openssh.html
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60 */
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61 if (ses.keys->trans.algo_comp != DROPBEAR_COMP_ZLIB_DELAY) {
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62 ses.authstate.authtypes = AUTH_TYPE_PUBKEY;
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63 if (getenv(DROPBEAR_PASSWORD_ENV)) {
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64 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD | AUTH_TYPE_INTERACT;
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65 }
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66 if (cli_auth_try() == DROPBEAR_SUCCESS) {
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67 TRACE(("skipped initial none auth query"))
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68 /* Note that there will be two auth responses in-flight */
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69 cli_ses.ignore_next_auth_response = 1;
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70 }
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71 }
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72 #endif
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73 TRACE(("leave cli_auth_getmethods"))
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74 }
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75
43
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76 void recv_msg_userauth_banner() {
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77
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78 char* banner = NULL;
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79 unsigned int bannerlen;
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80 unsigned int i, linecount;
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81
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82 TRACE(("enter recv_msg_userauth_banner"))
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83 if (ses.authstate.authdone) {
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84 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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85 return;
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86 }
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87
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88 banner = buf_getstring(ses.payload, &bannerlen);
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89 buf_eatstring(ses.payload); /* The language string */
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90
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91 if (bannerlen > MAX_BANNER_SIZE) {
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92 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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93 goto out;
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94 }
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95
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96 cleantext(banner);
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97
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98 /* Limit to 25 lines */
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99 linecount = 1;
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100 for (i = 0; i < bannerlen; i++) {
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101 if (banner[i] == '\n') {
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102 if (linecount >= MAX_BANNER_LINES) {
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103 banner[i] = '\0';
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104 break;
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105 }
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106 linecount++;
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107 }
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108 }
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109
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110 fprintf(stderr, "%s\n", banner);
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111
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112 out:
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113 m_free(banner);
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114 TRACE(("leave recv_msg_userauth_banner"))
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115 }
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116
249
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117 /* This handles the message-specific types which
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118 * all have a value of 60. These are
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119 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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120 * SSH_MSG_USERAUTH_PK_OK, &
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121 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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122 void recv_msg_userauth_specific_60() {
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123
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124 #ifdef ENABLE_CLI_PUBKEY_AUTH
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125 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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126 recv_msg_userauth_pk_ok();
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127 return;
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128 }
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129 #endif
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130
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131 #ifdef ENABLE_CLI_INTERACT_AUTH
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132 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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133 recv_msg_userauth_info_request();
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134 return;
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135 }
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136 #endif
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137
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138 #ifdef ENABLE_CLI_PASSWORD_AUTH
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139 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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140 /* Eventually there could be proper password-changing
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141 * support. However currently few servers seem to
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142 * implement it, and password auth is last-resort
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143 * regardless - keyboard-interactive is more likely
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144 * to be used anyway. */
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diff changeset
145 dropbear_close("Your password has expired.");
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diff changeset
146 }
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diff changeset
147 #endif
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148
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diff changeset
149 dropbear_exit("Unexpected userauth packet");
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150 }
43
942b22d7dd1c Banner printing
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151
33
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152 void recv_msg_userauth_failure() {
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153
1115
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154 char * methods = NULL;
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155 char * tok = NULL;
33
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156 unsigned int methlen = 0;
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157 unsigned int partial = 0;
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158 unsigned int i = 0;
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159
165
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160 TRACE(("<- MSG_USERAUTH_FAILURE"))
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161 TRACE(("enter recv_msg_userauth_failure"))
33
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162
883
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163 if (ses.authstate.authdone) {
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164 TRACE(("leave recv_msg_userauth_failure, already authdone."))
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165 return;
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166 }
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167
45
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168 if (cli_ses.state != USERAUTH_REQ_SENT) {
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169 /* Perhaps we should be more fatal? */
249
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170 dropbear_exit("Unexpected userauth failure");
45
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171 }
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172
883
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173 /* When DROPBEAR_CLI_IMMEDIATE_AUTH is set there will be an initial response for
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174 the "none" auth request, and then a response to the immediate auth request.
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175 We need to be careful handling them. */
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176 if (cli_ses.ignore_next_auth_response) {
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177 cli_ses.state = USERAUTH_REQ_SENT;
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178 cli_ses.ignore_next_auth_response = 0;
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179 TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
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180 return;
883
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181 } else {
68
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182 #ifdef ENABLE_CLI_PUBKEY_AUTH
883
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183 /* If it was a pubkey auth request, we should cross that key
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184 * off the list. */
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185 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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186 cli_pubkeyfail();
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187 }
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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188 #endif
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189
249
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190 #ifdef ENABLE_CLI_INTERACT_AUTH
883
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191 /* If we get a failure message for keyboard interactive without
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192 * receiving any request info packet, then we don't bother trying
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193 * keyboard interactive again */
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194 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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195 && !cli_ses.interact_request_received) {
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196 TRACE(("setting auth_interact_failed = 1"))
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197 cli_ses.auth_interact_failed = 1;
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198 }
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199 #endif
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200 cli_ses.state = USERAUTH_FAIL_RCVD;
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201 cli_ses.lastauthtype = AUTH_TYPE_NONE;
249
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diff changeset
202 }
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203
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
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diff changeset
204 methods = buf_getstring(ses.payload, &methlen);
33
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205
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
206 partial = buf_getbool(ses.payload);
33
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207
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208 if (partial) {
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209 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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210 } else {
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211 ses.authstate.failcount++;
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212 }
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213
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
214 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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215
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216 ses.authstate.authdone=0;
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217 ses.authstate.authtypes=0;
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218
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219 /* Split with nulls rather than commas */
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220 for (i = 0; i < methlen; i++) {
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221 if (methods[i] == ',') {
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222 methods[i] = '\0';
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223 }
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224 }
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225
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226 tok = methods; /* tok stores the next method we'll compare */
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227 for (i = 0; i <= methlen; i++) {
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228 if (methods[i] == '\0') {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
229 TRACE(("auth method '%s'", tok))
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
230 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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diff changeset
231 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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diff changeset
232 AUTH_METHOD_PUBKEY_LEN) == 0) {
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diff changeset
233 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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234 }
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235 #endif
249
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parents: 179
diff changeset
236 #ifdef ENABLE_CLI_INTERACT_AUTH
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parents: 179
diff changeset
237 if (strncmp(AUTH_METHOD_INTERACT, tok,
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parents: 179
diff changeset
238 AUTH_METHOD_INTERACT_LEN) == 0) {
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diff changeset
239 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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diff changeset
240 }
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diff changeset
241 #endif
68
eee77ac31ccc cleaning up the pubkey defines
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diff changeset
242 #ifdef ENABLE_CLI_PASSWORD_AUTH
33
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243 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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diff changeset
244 AUTH_METHOD_PASSWORD_LEN) == 0) {
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245 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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246 }
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247 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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diff changeset
248 tok = &methods[i+1]; /* Must make sure we don't use it after the
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parents: 33
diff changeset
249 last loop, since it'll point to something
e2a1eaa19f22 Client mostly works up to password auth
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parents: 33
diff changeset
250 undefined */
33
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251 }
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252 }
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253
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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parents: 74
diff changeset
254 m_free(methods);
33
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diff changeset
255
165
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parents: 114
diff changeset
256 TRACE(("leave recv_msg_userauth_failure"))
33
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257 }
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258
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diff changeset
259 void recv_msg_userauth_success() {
883
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260 /* This function can validly get called multiple times
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diff changeset
261 if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
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diff changeset
262
165
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parents: 114
diff changeset
263 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 441
diff changeset
264 /* Note: in delayed-zlib mode, setting authdone here
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 441
diff changeset
265 * will enable compression in the transport layer */
33
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diff changeset
266 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
267 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
268 cli_ses.lastauthtype = AUTH_TYPE_NONE;
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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parents: 545
diff changeset
269
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parents: 545
diff changeset
270 #ifdef ENABLE_CLI_PUBKEY_AUTH
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parents: 545
diff changeset
271 cli_auth_pubkey_cleanup();
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diff changeset
272 #endif
33
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273 }
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274
734
619b1ed837fd Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
Matt Johnston <matt@ucc.asn.au>
parents: 732
diff changeset
275 int cli_auth_try() {
33
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diff changeset
276
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
Matt Johnston <matt@ucc.asn.au>
parents: 268
diff changeset
277 int finished = 0;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 114
diff changeset
278 TRACE(("enter cli_auth_try"))
33
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279
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diff changeset
280 CHECKCLEARTOWRITE();
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diff changeset
281
249
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diff changeset
282 /* Order to try is pubkey, interactive, password.
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diff changeset
283 * As soon as "finished" is set for one, we don't do any more. */
68
eee77ac31ccc cleaning up the pubkey defines
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parents: 45
diff changeset
284 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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diff changeset
285 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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286 finished = cli_auth_pubkey();
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287 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
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288 }
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289 #endif
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290
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291 #ifdef ENABLE_CLI_PASSWORD_AUTH
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292 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
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293 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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294 fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
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295 } else {
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296 cli_auth_password();
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297 finished = 1;
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298 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
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299 }
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300 }
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301 #endif
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302
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303 #ifdef ENABLE_CLI_INTERACT_AUTH
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304 if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
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305 if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
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306 fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
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307 } else {
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308 if (!cli_ses.auth_interact_failed) {
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309 cli_auth_interactive();
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310 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
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311 finished = 1;
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312 }
249
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313 }
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314 }
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315 #endif
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316
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317 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
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318
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319 if (finished) {
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320 TRACE(("leave cli_auth_try success"))
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321 return DROPBEAR_SUCCESS;
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322 }
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323 TRACE(("leave cli_auth_try failure"))
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324 return DROPBEAR_FAILURE;
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325 }
268
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326
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327 #if defined(ENABLE_CLI_PASSWORD_AUTH) || defined(ENABLE_CLI_INTERACT_AUTH)
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328 /* A helper for getpass() that exits if the user cancels. The returned
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329 * password is statically allocated by getpass() */
334
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330 char* getpass_or_cancel(char* prompt)
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331 {
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332 char* password = NULL;
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333
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334 #ifdef DROPBEAR_PASSWORD_ENV
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335 /* Password provided in an environment var */
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336 password = getenv(DROPBEAR_PASSWORD_ENV);
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337 if (password)
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338 {
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339 return password;
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340 }
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341 #endif
268
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342
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343 password = getpass(prompt);
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344
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345 /* 0x03 is a ctrl-c character in the buffer. */
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346 if (password == NULL || strchr(password, '\3') != NULL) {
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347 dropbear_close("Interrupted.");
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348 }
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349 return password;
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350 }
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351 #endif