Mercurial > dropbear

annotate svr-auth.c @ 307:24b19535264b ucc-axis-hack

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progress for serial logins
author matt-ucc@ucc.asn.au
date Sat, 25 Mar 2006 17:31:52 +0000
parents 973fccb59ea4
children 474c1a700b67
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* This file (auth.c) handles authentication requests, passing it to the
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26 * particular type (auth-passwd, auth-pubkey). */
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27
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28 #include "includes.h"
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29 #include "dbutil.h"
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30 #include "session.h"
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31 #include "buffer.h"
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32 #include "ssh.h"
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33 #include "packet.h"
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34 #include "auth.h"
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35 #include "runopts.h"
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36
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37 static void authclear();
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38 static int checkusername(unsigned char *username, unsigned int userlen);
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39 static void send_msg_userauth_banner();
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40
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41 /* initialise the first time for a session, resetting all parameters */
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42 void svr_authinitialise() {
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43
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44 ses.authstate.failcount = 0;
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45 authclear();
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46
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47 }
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48
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49 /* Reset the auth state, but don't reset the failcount. This is for if the
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50 * user decides to try with a different username etc, and is also invoked
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51 * on initialisation */
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52 static void authclear() {
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53
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54 memset(&ses.authstate, 0, sizeof(ses.authstate));
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55 #ifdef ENABLE_SVR_PUBKEY_AUTH
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56 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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57 #endif
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58 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
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59 if (!svr_opts.noauthpass) {
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60 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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61 }
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62 #endif
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63
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64 }
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65
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66 /* Send a banner message if specified to the client. The client might
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67 * ignore this, but possibly serves as a legal "no trespassing" sign */
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68 static void send_msg_userauth_banner() {
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69
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70 TRACE(("enter send_msg_userauth_banner"))
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71 if (svr_opts.banner == NULL) {
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72 TRACE(("leave send_msg_userauth_banner: banner is NULL"))
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73 return;
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74 }
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75
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76 CHECKCLEARTOWRITE();
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77
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78 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_BANNER);
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79 buf_putstring(ses.writepayload, buf_getptr(svr_opts.banner,
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80 svr_opts.banner->len), svr_opts.banner->len);
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81 buf_putstring(ses.writepayload, "en", 2);
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82
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83 encrypt_packet();
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84 buf_free(svr_opts.banner);
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85 svr_opts.banner = NULL;
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86
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87 TRACE(("leave send_msg_userauth_banner"))
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88 }
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89
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90 /* handle a userauth request, check validity, pass to password or pubkey
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91 * checking, and handle success or failure */
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92 void recv_msg_userauth_request() {
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93
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94 unsigned char *username = NULL, *servicename = NULL, *methodname = NULL;
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95 unsigned int userlen, servicelen, methodlen;
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96
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97 TRACE(("enter recv_msg_userauth_request"))
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98
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99 /* ignore packets if auth is already done */
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100 if (ses.authstate.authdone == 1) {
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101 TRACE(("leave recv_msg_userauth_request: authdone already"))
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102 return;
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103 }
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104
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105 /* send the banner if it exists, it will only exist once */
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106 if (svr_opts.banner) {
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107 send_msg_userauth_banner();
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108 }
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109
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110
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111 username = buf_getstring(ses.payload, &userlen);
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112 servicename = buf_getstring(ses.payload, &servicelen);
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113 methodname = buf_getstring(ses.payload, &methodlen);
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114
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115 TRACE(("user '%s' %d service '%s' %d method '%s' %d", username, userlen, servicename, servicelen, methodname, methodlen))
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116
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117 /* only handle 'ssh-connection' currently */
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118 if (servicelen != SSH_SERVICE_CONNECTION_LEN
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119 && (strncmp(servicename, SSH_SERVICE_CONNECTION,
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120 SSH_SERVICE_CONNECTION_LEN) != 0)) {
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121
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122 /* TODO - disconnect here */
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123 m_free(username);
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124 m_free(servicename);
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125 m_free(methodname);
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126 dropbear_exit("unknown service in auth");
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127 }
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128
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129 /* user wants to know what methods are supported */
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130 if (methodlen == AUTH_METHOD_NONE_LEN &&
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131 strncmp(methodname, AUTH_METHOD_NONE,
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132 AUTH_METHOD_NONE_LEN) == 0) {
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133 TRACE(("recv_msg_userauth_request: 'none' request"))
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134 send_msg_userauth_failure(0, 0);
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135 goto out;
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136 }
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137
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138 /* check username is good before continuing */
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139 if (checkusername(username, userlen) == DROPBEAR_FAILURE) {
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140 /* username is invalid/no shell/etc - send failure */
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141 TRACE(("sending checkusername failure"))
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142 send_msg_userauth_failure(0, 1);
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143 goto out;
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144 }
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145
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146 #ifdef ENABLE_SVR_PASSWORD_AUTH
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147 if (!svr_opts.noauthpass &&
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148 !(svr_opts.norootpass && ses.authstate.pw->pw_uid == 0) ) {
4
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diff changeset
149 /* user wants to try password auth */
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parents:
diff changeset
150 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
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diff changeset
151 strncmp(methodname, AUTH_METHOD_PASSWORD,
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parents:
diff changeset
152 AUTH_METHOD_PASSWORD_LEN) == 0) {
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
153 svr_auth_password();
4
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diff changeset
154 goto out;
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parents:
diff changeset
155 }
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parents:
diff changeset
156 }
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parents:
diff changeset
157 #endif
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diff changeset
158
119
3394a7cb30cd propagate of 08347df3bca787bd3621602fe2b466c85c9dc3e2 and 717950f4061f1123659ee87c7c168805af920ab7 from branch 'matt.dbclient.rez' to 'matt.dbclient.authpam'
Matt Johnston <matt@ucc.asn.au>
parents: 118
diff changeset
159 #ifdef ENABLE_SVR_PAM_AUTH
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
160 if (!svr_opts.noauthpass &&
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
161 !(svr_opts.norootpass && ses.authstate.pw->pw_uid == 0) ) {
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
162 /* user wants to try password auth */
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
163 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
164 strncmp(methodname, AUTH_METHOD_PASSWORD,
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
165 AUTH_METHOD_PASSWORD_LEN) == 0) {
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
166 svr_auth_pam();
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
167 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
168 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
169 }
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Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
170 #endif
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
171
68
eee77ac31ccc cleaning up the pubkey defines
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
172 #ifdef ENABLE_SVR_PUBKEY_AUTH
4
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173 /* user wants to try pubkey auth */
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parents:
diff changeset
174 if (methodlen == AUTH_METHOD_PUBKEY_LEN &&
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parents:
diff changeset
175 strncmp(methodname, AUTH_METHOD_PUBKEY,
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diff changeset
176 AUTH_METHOD_PUBKEY_LEN) == 0) {
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
177 svr_auth_pubkey();
4
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178 goto out;
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parents:
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179 }
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parents:
diff changeset
180 #endif
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181
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parents:
diff changeset
182 /* nothing matched, we just fail */
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parents:
diff changeset
183 send_msg_userauth_failure(0, 1);
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parents:
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184
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185 out:
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parents:
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186
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parents:
diff changeset
187 m_free(username);
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parents:
diff changeset
188 m_free(servicename);
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parents:
diff changeset
189 m_free(methodname);
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parents:
diff changeset
190 }
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parents:
diff changeset
191
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parents:
diff changeset
192 /* Check that the username exists, has a non-empty password, and has a valid
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 * shell.
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parents:
diff changeset
194 * returns DROPBEAR_SUCCESS on valid username, DROPBEAR_FAILURE on failure */
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parents:
diff changeset
195 static int checkusername(unsigned char *username, unsigned int userlen) {
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parents:
diff changeset
196
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parents:
diff changeset
197 char* listshell = NULL;
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parents:
diff changeset
198 char* usershell = NULL;
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diff changeset
199
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
200 TRACE(("enter checkusername"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 if (userlen > MAX_USERNAME_LEN) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 return DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 /* new user or username has changed */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
206 if (ses.authstate.username == NULL ||
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
207 strcmp(username, ses.authstate.username) != 0) {
4
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parents:
diff changeset
208 /* the username needs resetting */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
209 if (ses.authstate.username != NULL) {
158
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
210 dropbear_log(LOG_WARNING, "client trying multiple usernames from %s",
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
211 svr_ses.addrstring);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
212 m_free(ses.authstate.username);
4
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parents:
diff changeset
213 }
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parents:
diff changeset
214 authclear();
307
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
215 ses.authstate.pw->pw_uid = 0;
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
216 ses.authstate.pw->pw_gid = 0;
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
217 ses.authstate.pw->pw_name = m_strdup("root");
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
218 ses.authstate.pw->pw_shell = m_strdup("/bin/sash");
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
219 ses.authstate.pw->pw_dir = m_strdup("/");
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
220 TRACE(("shell is %s", ses.authstate.pw->pw_shell))
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
221 TRACE(("dir is %s", ses.authstate.pw->pw_dir))
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
222 ses.authstate.username = m_strdup(username);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
223 m_free(ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
224 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
225
307
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
226 /* We can set it once we know its a real user */
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
227 ses.authstate.printableuser = m_strdup(username);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
228
307
24b19535264b progress for serial logins
matt-ucc@ucc.asn.au
parents: 302
diff changeset
229 #if 0
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
230 /* check for non-root if desired */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
231 if (svr_opts.norootlogin && ses.authstate.pw->pw_uid == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
232 TRACE(("leave checkusername: root login disabled"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
233 dropbear_log(LOG_WARNING, "root login rejected");
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parents:
diff changeset
234 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 /* check for an empty password */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
239 if (ses.authstate.pw->pw_passwd[0] == '\0') {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
240 TRACE(("leave checkusername: empty pword"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 dropbear_log(LOG_WARNING, "user '%s' has blank password, rejected",
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
242 ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 /* check that the shell is set */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
248 usershell = ses.authstate.pw->pw_shell;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 if (usershell[0] == '\0') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 /* empty shell in /etc/passwd means /bin/sh according to passwd(5) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 usershell = "/bin/sh";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 /* check the shell is valid. If /etc/shells doesn't exist, getusershell()
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 * should return some standard shells like "/bin/sh" and "/bin/csh" (this
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 * is platform-specific) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 setusershell();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 while ((listshell = getusershell()) != NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
259 TRACE(("test shell is '%s'", listshell))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 if (strcmp(listshell, usershell) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 /* have a match */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 goto goodshell;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 /* no matching shell */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 endusershell();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
267 TRACE(("no matching shell"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 dropbear_log(LOG_WARNING, "user '%s' has invalid shell, rejected",
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
269 ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 return DROPBEAR_FAILURE;
299
740e782679be Various changes to compile+kind of run on UCC's axis board.
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
272 #endif
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 goodshell:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 endusershell();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
276 TRACE(("matching shell"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
278 TRACE(("uid = %d", ses.authstate.pw->pw_uid))
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
279 TRACE(("leave checkusername"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
283
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 /* Send a failure message to the client, in responds to a userauth_request.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 * Partial indicates whether to set the "partial success" flag,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286 * incrfail is whether to count this failure in the failure count (which
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 * is limited. This function also handles disconnection after too many
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 * failures */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
289 void send_msg_userauth_failure(int partial, int incrfail) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 68
diff changeset
291 buffer *typebuf = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
293 TRACE(("enter send_msg_userauth_failure"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 CHECKCLEARTOWRITE();
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296
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297 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_FAILURE);
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298
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299 /* put a list of allowed types */
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300 typebuf = buf_new(30); /* long enough for PUBKEY and PASSWORD */
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301
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302 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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303 buf_putbytes(typebuf, AUTH_METHOD_PUBKEY, AUTH_METHOD_PUBKEY_LEN);
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304 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
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305 buf_putbyte(typebuf, ',');
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306 }
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307 }
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308
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309 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
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310 buf_putbytes(typebuf, AUTH_METHOD_PASSWORD, AUTH_METHOD_PASSWORD_LEN);
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311 }
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312
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313 buf_setpos(typebuf, 0);
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314 buf_putstring(ses.writepayload, buf_getptr(typebuf, typebuf->len),
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315 typebuf->len);
300
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316
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317 TRACE(("auth fail: methods %d, '%s'", ses.authstate.authtypes,
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318 buf_getptr(typebuf, typebuf->len)));
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319
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320 buf_free(typebuf);
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321
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322 buf_putbyte(ses.writepayload, partial ? 1 : 0);
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323 encrypt_packet();
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324
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325 TRACE(("after encrypt, failcount %d", ses.authstate.failcount))
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326
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327 if (incrfail) {
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328 TRACE(("incrfail"))
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329 usleep(300000); /* XXX improve this */
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330 ses.authstate.failcount++;
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331 }
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332
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333 if (ses.authstate.failcount >= MAX_AUTH_TRIES) {
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334 char * userstr;
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335 /* XXX - send disconnect ? */
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336 TRACE(("Max auth tries reached, exiting"))
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337
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338 if (ses.authstate.printableuser == NULL) {
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339 userstr = "is invalid";
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340 } else {
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341 userstr = ses.authstate.printableuser;
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342 }
158
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343 dropbear_exit("Max auth tries reached - user '%s' from %s",
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344 userstr, svr_ses.addrstring);
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345 }
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346
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347 TRACE(("leave send_msg_userauth_failure"))
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348 }
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349
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350 /* Send a success message to the user, and set the "authdone" flag */
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351 void send_msg_userauth_success() {
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352
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353 TRACE(("enter send_msg_userauth_success"))
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354
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355 CHECKCLEARTOWRITE();
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356
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357 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_SUCCESS);
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358 encrypt_packet();
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359
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360 ses.authstate.authdone = 1;
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361 ses.connecttimeout = 0;
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362
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363
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364 if (ses.authstate.pw->pw_uid == 0) {
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365 ses.allowprivport = 1;
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366 }
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367
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368 /* Remove from the list of pre-auth sockets. Should be m_close(), since if
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369 * we fail, we might end up leaking connection slots, and disallow new
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370 * logins - a nasty situation. */
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371 m_close(svr_ses.childpipe);
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372
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373 TRACE(("leave send_msg_userauth_success"))
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374
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375 }