Mercurial > dropbear

annotate cli-auth.c @ 709:abd99ecd7ec2

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use an empty writebuf rather than a NULL one
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2013 22:31:07 +0800
parents de3653483ac0
children a4b7627b3157
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
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44 TRACE(("enter cli_auth_getmethods"))
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45
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46 CHECKCLEARTOWRITE();
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47
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48 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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49 buf_putstring(ses.writepayload, cli_opts.username,
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50 strlen(cli_opts.username));
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51 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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52 SSH_SERVICE_CONNECTION_LEN);
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53 buf_putstring(ses.writepayload, "none", 4); /* 'none' method */
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54
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55 encrypt_packet();
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56 TRACE(("leave cli_auth_getmethods"))
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57
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58 }
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59
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60 void recv_msg_userauth_banner() {
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61
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62 unsigned char* banner = NULL;
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63 unsigned int bannerlen;
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64 unsigned int i, linecount;
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65
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66 TRACE(("enter recv_msg_userauth_banner"))
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67 if (ses.authstate.authdone) {
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68 TRACE(("leave recv_msg_userauth_banner: banner after auth done"))
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69 return;
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70 }
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71
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72 banner = buf_getstring(ses.payload, &bannerlen);
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73 buf_eatstring(ses.payload); /* The language string */
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74
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75 if (bannerlen > MAX_BANNER_SIZE) {
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76 TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
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77 goto out;
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78 }
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79
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80 cleantext(banner);
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81
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82 /* Limit to 25 lines */
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83 linecount = 1;
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84 for (i = 0; i < bannerlen; i++) {
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85 if (banner[i] == '\n') {
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86 if (linecount >= MAX_BANNER_LINES) {
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87 banner[i] = '\0';
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88 break;
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89 }
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90 linecount++;
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91 }
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92 }
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93
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94 fprintf(stderr, "%s\n", banner);
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95
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96 out:
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97 m_free(banner);
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98 TRACE(("leave recv_msg_userauth_banner"))
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99 }
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100
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101 /* This handles the message-specific types which
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102 * all have a value of 60. These are
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103 * SSH_MSG_USERAUTH_PASSWD_CHANGEREQ,
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104 * SSH_MSG_USERAUTH_PK_OK, &
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105 * SSH_MSG_USERAUTH_INFO_REQUEST. */
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106 void recv_msg_userauth_specific_60() {
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107
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108 #ifdef ENABLE_CLI_PUBKEY_AUTH
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109 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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110 recv_msg_userauth_pk_ok();
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111 return;
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112 }
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113 #endif
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114
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115 #ifdef ENABLE_CLI_INTERACT_AUTH
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116 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
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117 recv_msg_userauth_info_request();
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118 return;
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119 }
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120 #endif
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121
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122 #ifdef ENABLE_CLI_PASSWORD_AUTH
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123 if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
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124 /* Eventually there could be proper password-changing
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125 * support. However currently few servers seem to
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126 * implement it, and password auth is last-resort
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127 * regardless - keyboard-interactive is more likely
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128 * to be used anyway. */
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129 dropbear_close("Your password has expired.");
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130 }
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131 #endif
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132
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133 dropbear_exit("Unexpected userauth packet");
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134 }
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135
33
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136 void recv_msg_userauth_failure() {
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137
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138 unsigned char * methods = NULL;
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139 unsigned char * tok = NULL;
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140 unsigned int methlen = 0;
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141 unsigned int partial = 0;
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142 unsigned int i = 0;
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143
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144 TRACE(("<- MSG_USERAUTH_FAILURE"))
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145 TRACE(("enter recv_msg_userauth_failure"))
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146
45
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147 if (cli_ses.state != USERAUTH_REQ_SENT) {
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148 /* Perhaps we should be more fatal? */
249
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149 dropbear_exit("Unexpected userauth failure");
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150 }
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151
68
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152 #ifdef ENABLE_CLI_PUBKEY_AUTH
45
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153 /* If it was a pubkey auth request, we should cross that key
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154 * off the list. */
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diff changeset
155 if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
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diff changeset
156 cli_pubkeyfail();
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diff changeset
157 }
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diff changeset
158 #endif
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159
249
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diff changeset
160 #ifdef ENABLE_CLI_INTERACT_AUTH
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diff changeset
161 /* If we get a failure message for keyboard interactive without
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parents: 179
diff changeset
162 * receiving any request info packet, then we don't bother trying
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diff changeset
163 * keyboard interactive again */
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parents: 179
diff changeset
164 if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT
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diff changeset
165 && !cli_ses.interact_request_received) {
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diff changeset
166 TRACE(("setting auth_interact_failed = 1"))
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diff changeset
167 cli_ses.auth_interact_failed = 1;
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168 }
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diff changeset
169 #endif
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170
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diff changeset
171 cli_ses.lastauthtype = AUTH_TYPE_NONE;
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172
33
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173 methods = buf_getstring(ses.payload, &methlen);
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174
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
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175 partial = buf_getbool(ses.payload);
33
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176
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177 if (partial) {
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178 dropbear_log(LOG_INFO, "Authentication partially succeeded, more attempts required");
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179 } else {
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180 ses.authstate.failcount++;
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181 }
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182
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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183 TRACE(("Methods (len %d): '%s'", methlen, methods))
33
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184
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185 ses.authstate.authdone=0;
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186 ses.authstate.authtypes=0;
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187
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188 /* Split with nulls rather than commas */
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189 for (i = 0; i < methlen; i++) {
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190 if (methods[i] == ',') {
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191 methods[i] = '\0';
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192 }
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193 }
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194
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195 tok = methods; /* tok stores the next method we'll compare */
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196 for (i = 0; i <= methlen; i++) {
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197 if (methods[i] == '\0') {
165
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198 TRACE(("auth method '%s'", tok))
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199 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
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200 if (strncmp(AUTH_METHOD_PUBKEY, tok,
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201 AUTH_METHOD_PUBKEY_LEN) == 0) {
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202 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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203 }
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204 #endif
249
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diff changeset
205 #ifdef ENABLE_CLI_INTERACT_AUTH
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206 if (strncmp(AUTH_METHOD_INTERACT, tok,
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diff changeset
207 AUTH_METHOD_INTERACT_LEN) == 0) {
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diff changeset
208 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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209 }
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diff changeset
210 #endif
68
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diff changeset
211 #ifdef ENABLE_CLI_PASSWORD_AUTH
33
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212 if (strncmp(AUTH_METHOD_PASSWORD, tok,
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213 AUTH_METHOD_PASSWORD_LEN) == 0) {
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214 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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215 }
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216 #endif
34
e2a1eaa19f22 Client mostly works up to password auth
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diff changeset
217 tok = &methods[i+1]; /* Must make sure we don't use it after the
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diff changeset
218 last loop, since it'll point to something
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diff changeset
219 undefined */
33
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220 }
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221 }
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222
114
2be6aa26a8c9 Leak found with MallocDebug - it's kinda useful
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diff changeset
223 m_free(methods);
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diff changeset
224
33
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225 cli_ses.state = USERAUTH_FAIL_RCVD;
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226
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
227 TRACE(("leave recv_msg_userauth_failure"))
33
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228 }
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229
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230 void recv_msg_userauth_success() {
165
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diff changeset
231 TRACE(("received msg_userauth_success"))
501
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
232 /* Note: in delayed-zlib mode, setting authdone here
d58c478bd399 Add support for [email protected] delayed compression.
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parents: 441
diff changeset
233 * will enable compression in the transport layer */
33
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234 ses.authstate.authdone = 1;
37
0913e2ee3545 we're nearly there yet
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parents: 35
diff changeset
235 cli_ses.state = USERAUTH_SUCCESS_RCVD;
249
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diff changeset
236 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
237
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
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diff changeset
238 #ifdef ENABLE_CLI_PUBKEY_AUTH
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parents: 545
diff changeset
239 cli_auth_pubkey_cleanup();
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parents: 545
diff changeset
240 #endif
33
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241 }
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242
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diff changeset
243 void cli_auth_try() {
f789045062e6 Progressing client support
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diff changeset
244
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
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parents: 268
diff changeset
245 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
246 TRACE(("enter cli_auth_try"))
33
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247
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diff changeset
248 CHECKCLEARTOWRITE();
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parents:
diff changeset
249
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
250 /* Order to try is pubkey, interactive, password.
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parents: 179
diff changeset
251 * 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
252 #ifdef ENABLE_CLI_PUBKEY_AUTH
33
f789045062e6 Progressing client support
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diff changeset
253 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
f789045062e6 Progressing client support
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diff changeset
254 finished = cli_auth_pubkey();
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents: 43
diff changeset
255 cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
33
f789045062e6 Progressing client support
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parents:
diff changeset
256 }
f789045062e6 Progressing client support
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parents:
diff changeset
257 #endif
f789045062e6 Progressing client support
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diff changeset
258
249
efbaf6b03837 added keyboard-interactive client support
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diff changeset
259 #ifdef ENABLE_CLI_INTERACT_AUTH
efbaf6b03837 added keyboard-interactive client support
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diff changeset
260 if (!finished && ses.authstate.authtypes & AUTH_TYPE_INTERACT) {
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
261 if (cli_ses.auth_interact_failed) {
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
262 finished = 0;
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
263 } else {
efbaf6b03837 added keyboard-interactive client support
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
264 cli_auth_interactive();
efbaf6b03837 added keyboard-interactive client support
Matt Johnston <matt@ucc.asn.au>
parents: 179
diff changeset
265 cli_ses.lastauthtype = AUTH_TYPE_INTERACT;
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
266 finished = 1;
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
267 }
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
268 }
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
269 #endif
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
270
68
eee77ac31ccc cleaning up the pubkey defines
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parents: 45
diff changeset
271 #ifdef ENABLE_CLI_PASSWORD_AUTH
33
f789045062e6 Progressing client support
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parents:
diff changeset
272 if (!finished && ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
249
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
273 cli_auth_password();
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
274 finished = 1;
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents: 43
diff changeset
275 cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
33
f789045062e6 Progressing client support
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parents:
diff changeset
276 }
f789045062e6 Progressing client support
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parents:
diff changeset
277 #endif
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parents:
diff changeset
278
249
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parents: 179
diff changeset
279 TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
efbaf6b03837 added keyboard-interactive client support
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parents: 179
diff changeset
280
33
f789045062e6 Progressing client support
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parents:
diff changeset
281 if (!finished) {
f789045062e6 Progressing client support
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parents:
diff changeset
282 dropbear_exit("No auth methods could be used.");
f789045062e6 Progressing client support
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parents:
diff changeset
283 }
f789045062e6 Progressing client support
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parents:
diff changeset
284
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 114
diff changeset
285 TRACE(("leave cli_auth_try"))
33
f789045062e6 Progressing client support
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parents:
diff changeset
286 }
268
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
287
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
288 /* A helper for getpass() that exits if the user cancels. The returned
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
289 * password is statically allocated by getpass() */
334
8f3ec7c104d9 Make the dbclient password prompt more useful
Matt Johnston <matt@ucc.asn.au>
parents: 300
diff changeset
290 char* getpass_or_cancel(char* prompt)
268
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
291 {
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
292 char* password = NULL;
441
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
293
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
294 #ifdef DROPBEAR_PASSWORD_ENV
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
295 /* Password provided in an environment var */
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
296 password = getenv(DROPBEAR_PASSWORD_ENV);
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
297 if (password)
fdf06a5a54e4 Allow reading dbclient password from an environment var
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parents: 334
diff changeset
298 {
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
299 return password;
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
300 }
fdf06a5a54e4 Allow reading dbclient password from an environment var
Matt Johnston <matt@ucc.asn.au>
parents: 334
diff changeset
301 #endif
268
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
Matt Johnston <matt@ucc.asn.au>
parents: 249
diff changeset
302
334
8f3ec7c104d9 Make the dbclient password prompt more useful
Matt Johnston <matt@ucc.asn.au>
parents: 300
diff changeset
303 password = getpass(prompt);
268
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304
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parents: 249
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305 /* 0x03 is a ctrl-c character in the buffer. */
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
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306 if (password == NULL || strchr(password, '\3') != NULL) {
475a818dd6e7 Cancel a dbclient password prompt if the user presses ctrl-c.
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307 dropbear_close("Interrupted.");
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308 }
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309 return password;
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310 }