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annotate svr-auth.c @ 275:7f9adaf85fca

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Exit with a message if the ssh protocol version is incompatible
author Matt Johnston <matt@ucc.asn.au>
date Sat, 04 Mar 2006 08:22:16 +0000
parents 0cfba3034be5
children f4cf0415fec1 740e782679be baea1d43e7eb
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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 /* only handle 'ssh-connection' currently */
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116 if (servicelen != SSH_SERVICE_CONNECTION_LEN
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117 && (strncmp(servicename, SSH_SERVICE_CONNECTION,
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118 SSH_SERVICE_CONNECTION_LEN) != 0)) {
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119
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120 /* TODO - disconnect here */
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121 m_free(username);
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122 m_free(servicename);
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123 m_free(methodname);
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124 dropbear_exit("unknown service in auth");
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125 }
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126
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127 /* user wants to know what methods are supported */
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128 if (methodlen == AUTH_METHOD_NONE_LEN &&
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129 strncmp(methodname, AUTH_METHOD_NONE,
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130 AUTH_METHOD_NONE_LEN) == 0) {
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131 TRACE(("recv_msg_userauth_request: 'none' request"))
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132 send_msg_userauth_failure(0, 0);
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133 goto out;
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134 }
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135
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136 /* check username is good before continuing */
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137 if (checkusername(username, userlen) == DROPBEAR_FAILURE) {
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138 /* username is invalid/no shell/etc - send failure */
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139 TRACE(("sending checkusername failure"))
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140 send_msg_userauth_failure(0, 1);
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141 goto out;
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142 }
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143
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144 #ifdef ENABLE_SVR_PASSWORD_AUTH
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145 if (!svr_opts.noauthpass &&
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146 !(svr_opts.norootpass && ses.authstate.pw->pw_uid == 0) ) {
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147 /* user wants to try password auth */
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148 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
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parents:
diff changeset
149 strncmp(methodname, AUTH_METHOD_PASSWORD,
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parents:
diff changeset
150 AUTH_METHOD_PASSWORD_LEN) == 0) {
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
151 svr_auth_password();
4
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parents:
diff changeset
152 goto out;
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parents:
diff changeset
153 }
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parents:
diff changeset
154 }
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parents:
diff changeset
155 #endif
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parents:
diff changeset
156
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
157 #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
158 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
159 !(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
160 /* 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
161 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
162 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
163 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
164 svr_auth_pam();
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
165 goto out;
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
166 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
167 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
168 #endif
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
169
68
eee77ac31ccc cleaning up the pubkey defines
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
170 #ifdef ENABLE_SVR_PUBKEY_AUTH
4
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parents:
diff changeset
171 /* user wants to try pubkey auth */
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parents:
diff changeset
172 if (methodlen == AUTH_METHOD_PUBKEY_LEN &&
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parents:
diff changeset
173 strncmp(methodname, AUTH_METHOD_PUBKEY,
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parents:
diff changeset
174 AUTH_METHOD_PUBKEY_LEN) == 0) {
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
175 svr_auth_pubkey();
4
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parents:
diff changeset
176 goto out;
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parents:
diff changeset
177 }
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parents:
diff changeset
178 #endif
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parents:
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179
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parents:
diff changeset
180 /* nothing matched, we just fail */
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parents:
diff changeset
181 send_msg_userauth_failure(0, 1);
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parents:
diff changeset
182
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 out:
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parents:
diff changeset
184
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 m_free(username);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 m_free(servicename);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 m_free(methodname);
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parents:
diff changeset
188 }
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parents:
diff changeset
189
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 /* 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
191 * shell.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 * returns DROPBEAR_SUCCESS on valid username, DROPBEAR_FAILURE on failure */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 static int checkusername(unsigned char *username, unsigned int userlen) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194
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parents:
diff changeset
195 char* listshell = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 char* usershell = NULL;
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parents:
diff changeset
197
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
198 TRACE(("enter checkusername"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 if (userlen > MAX_USERNAME_LEN) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 /* new user or username has changed */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
204 if (ses.authstate.username == NULL ||
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
205 strcmp(username, ses.authstate.username) != 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 /* the username needs resetting */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
207 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
208 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
209 svr_ses.addrstring);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
210 m_free(ses.authstate.username);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 authclear();
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
213 ses.authstate.pw = getpwnam((char*)username);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
214 ses.authstate.username = m_strdup(username);
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
215 m_free(ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 /* check that user exists */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
219 if (ses.authstate.pw == 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
220 TRACE(("leave checkusername: user '%s' doesn't exist", username))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 dropbear_log(LOG_WARNING,
158
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
222 "login attempt for nonexistent user from %s",
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
223 svr_ses.addrstring);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 send_msg_userauth_failure(0, 1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 return DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 /* We can set it once we know its a real user */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
229 ses.authstate.printableuser = m_strdup(ses.authstate.pw->pw_name);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 /* check for non-root if desired */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
232 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
233 TRACE(("leave checkusername: root login disabled"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 dropbear_log(LOG_WARNING, "root login rejected");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 return DROPBEAR_FAILURE;
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 /* check for an empty password */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
240 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
241 TRACE(("leave checkusername: empty pword"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 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
243 ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 return DROPBEAR_FAILURE;
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
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
248 TRACE(("shell is %s", ses.authstate.pw->pw_shell))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 /* check that the shell is set */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
251 usershell = ses.authstate.pw->pw_shell;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 if (usershell[0] == '\0') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 /* 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
254 usershell = "/bin/sh";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 /* 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
258 * 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
259 * is platform-specific) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 setusershell();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 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
262 TRACE(("test shell is '%s'", listshell))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 if (strcmp(listshell, usershell) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 /* have a match */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 goto goodshell;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 /* no matching shell */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269 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
270 TRACE(("no matching shell"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 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
272 ses.authstate.printableuser);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276 goodshell:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277 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
278 TRACE(("matching shell"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279
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
280 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
281 TRACE(("leave checkusername"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 return DROPBEAR_SUCCESS;
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 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286 /* 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
287 * 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
288 * 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
289 * 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
290 * failures */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 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
292
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 68
diff changeset
293 buffer *typebuf = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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295 TRACE(("enter send_msg_userauth_failure"))
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296
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297 CHECKCLEARTOWRITE();
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298
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299 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_FAILURE);
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300
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301 /* put a list of allowed types */
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302 typebuf = buf_new(30); /* long enough for PUBKEY and PASSWORD */
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303
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304 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
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305 buf_putbytes(typebuf, AUTH_METHOD_PUBKEY, AUTH_METHOD_PUBKEY_LEN);
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306 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
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307 buf_putbyte(typebuf, ',');
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308 }
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309 }
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310
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311 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
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312 buf_putbytes(typebuf, AUTH_METHOD_PASSWORD, AUTH_METHOD_PASSWORD_LEN);
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313 }
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314
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315 buf_setpos(typebuf, 0);
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316 buf_putstring(ses.writepayload, buf_getptr(typebuf, typebuf->len),
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317 typebuf->len);
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318 buf_free(typebuf);
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319
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320 buf_putbyte(ses.writepayload, partial ? 1 : 0);
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321 encrypt_packet();
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322
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323 TRACE(("auth fail: methods %d, '%s'", ses.authstate.authtypes,
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324 buf_getptr(typebuf, typebuf->len)));
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325
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326 if (incrfail) {
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327 usleep(300000); /* XXX improve this */
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328 ses.authstate.failcount++;
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329 }
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330
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331 if (ses.authstate.failcount >= MAX_AUTH_TRIES) {
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332 char * userstr;
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333 /* XXX - send disconnect ? */
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334 TRACE(("Max auth tries reached, exiting"))
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335
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336 if (ses.authstate.printableuser == NULL) {
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337 userstr = "is invalid";
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338 } else {
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339 userstr = ses.authstate.printableuser;
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340 }
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341 dropbear_exit("Max auth tries reached - user '%s' from %s",
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342 userstr, svr_ses.addrstring);
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343 }
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344
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345 TRACE(("leave send_msg_userauth_failure"))
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346 }
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347
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348 /* Send a success message to the user, and set the "authdone" flag */
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349 void send_msg_userauth_success() {
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350
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351 TRACE(("enter send_msg_userauth_success"))
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352
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353 CHECKCLEARTOWRITE();
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354
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355 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_SUCCESS);
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356 encrypt_packet();
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357
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358 ses.authstate.authdone = 1;
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359 ses.connecttimeout = 0;
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360
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361
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362 if (ses.authstate.pw->pw_uid == 0) {
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363 ses.allowprivport = 1;
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364 }
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365
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366 /* Remove from the list of pre-auth sockets. Should be m_close(), since if
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367 * we fail, we might end up leaking connection slots, and disallow new
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368 * logins - a nasty situation. */
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369 m_close(svr_ses.childpipe);
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370
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371 TRACE(("leave send_msg_userauth_success"))
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372
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373 }