Mercurial > dropbear

annotate svr-auth.c @ 925:bae0b34bc059 pam

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Better PAM through recursion
author Matt Johnston <matt@ucc.asn.au>
date Wed, 12 Mar 2014 23:40:02 +0800
parents 220f55d540ae
children 73ea0dce9a57
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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 #include "dbrandom.h"
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37
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38 static void authclear();
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39 static int checkusername(unsigned char *username, unsigned int userlen);
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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 ses.authstate.pw_name = NULL;
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46 ses.authstate.pw_dir = NULL;
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47 ses.authstate.pw_shell = NULL;
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48 ses.authstate.pw_passwd = NULL;
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49 authclear();
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51 }
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52
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53 /* Reset the auth state, but don't reset the failcount. This is for if the
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54 * user decides to try with a different username etc, and is also invoked
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55 * on initialisation */
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56 static void authclear() {
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57
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58 memset(&ses.authstate, 0, sizeof(ses.authstate));
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59 #ifdef ENABLE_SVR_PUBKEY_AUTH
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60 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
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61 #endif
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62 #ifdef ENABLE_SVR_PASSWORD_AUTH
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63 if (!svr_opts.noauthpass) {
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64 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
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65 }
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66 #endif
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67 #ifdef ENABLE_SVR_PAM_AUTH
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68 ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
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69 #endif
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70 if (ses.authstate.pw_name) {
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71 m_free(ses.authstate.pw_name);
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72 }
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73 if (ses.authstate.pw_shell) {
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74 m_free(ses.authstate.pw_shell);
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75 }
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76 if (ses.authstate.pw_dir) {
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77 m_free(ses.authstate.pw_dir);
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78 }
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79 if (ses.authstate.pw_passwd) {
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80 m_free(ses.authstate.pw_passwd);
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81 }
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82
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83 }
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84
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85 /* Send a banner message if specified to the client. The client might
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86 * ignore this, but possibly serves as a legal "no trespassing" sign */
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87 void send_msg_userauth_banner(buffer *banner) {
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88
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89 TRACE(("enter send_msg_userauth_banner"))
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90
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91 CHECKCLEARTOWRITE();
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92
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93 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_BANNER);
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94 buf_putbufstring(ses.writepayload, banner);
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95 buf_putstring(ses.writepayload, "en", 2);
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96
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97 encrypt_packet();
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98
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99 TRACE(("leave send_msg_userauth_banner"))
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100 }
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101
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102 /* handle a userauth request, check validity, pass to password or pubkey
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103 * checking, and handle success or failure */
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104 void recv_msg_userauth_request() {
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105
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106 unsigned char *username = NULL, *servicename = NULL, *methodname = NULL;
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107 unsigned int userlen, servicelen, methodlen;
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108 int valid_user = 0;
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109
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110 TRACE(("enter recv_msg_userauth_request"))
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111
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112 /* ignore packets if auth is already done */
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113 if (ses.authstate.authdone == 1) {
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114 TRACE(("leave recv_msg_userauth_request: authdone already"))
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115 return;
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116 }
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117
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118 /* send the banner if it exists, it will only exist once */
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119 if (svr_opts.banner) {
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120 send_msg_userauth_banner(svr_opts.banner);
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121 buf_free(svr_opts.banner);
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122 svr_opts.banner = NULL;
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123 }
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124
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125 username = buf_getstring(ses.payload, &userlen);
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126 servicename = buf_getstring(ses.payload, &servicelen);
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127 methodname = buf_getstring(ses.payload, &methodlen);
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128
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129 /* only handle 'ssh-connection' currently */
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130 if (servicelen != SSH_SERVICE_CONNECTION_LEN
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131 && (strncmp(servicename, SSH_SERVICE_CONNECTION,
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132 SSH_SERVICE_CONNECTION_LEN) != 0)) {
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133
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134 /* TODO - disconnect here */
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135 m_free(username);
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136 m_free(servicename);
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137 m_free(methodname);
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138 dropbear_exit("unknown service in auth");
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139 }
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140
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141 /* check username is good before continuing.
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142 * the 'incrfail' varies depending on the auth method to
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143 * avoid giving away which users exist on the system through
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Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
144 * the time delay. */
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
145 if (checkusername(username, userlen) == DROPBEAR_SUCCESS) {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
146 valid_user = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
149 /* user wants to know what methods are supported */
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
150 if (methodlen == AUTH_METHOD_NONE_LEN &&
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
151 strncmp(methodname, AUTH_METHOD_NONE,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
152 AUTH_METHOD_NONE_LEN) == 0) {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
153 TRACE(("recv_msg_userauth_request: 'none' request"))
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
154 if (valid_user
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
155 && svr_opts.allowblankpass
692
c58a15983808 Allow configuring "allow blank password option" at runtime
Paul Eggleton <paul.eggleton@linux.intel.com>
parents: 678
diff changeset
156 && !svr_opts.noauthpass
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
157 && !(svr_opts.norootpass && ses.authstate.pw_uid == 0)
677
55b84e59aaad Fix empty password immediate login
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
158 && ses.authstate.pw_passwd[0] == '\0')
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
159 {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
160 dropbear_log(LOG_NOTICE,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
161 "Auth succeeded with blank password for '%s' from %s",
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
162 ses.authstate.pw_name,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
163 svr_ses.addrstring);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
164 send_msg_userauth_success();
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
165 goto out;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
166 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
167 else
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
168 {
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
169 /* 'none' has no failure delay */
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
170 send_msg_userauth_failure(0, 0);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
171 goto out;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
172 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
173 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
174
68
eee77ac31ccc cleaning up the pubkey defines
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
175 #ifdef ENABLE_SVR_PASSWORD_AUTH
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
176 if (!svr_opts.noauthpass &&
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
177 !(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 /* user wants to try password auth */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 strncmp(methodname, AUTH_METHOD_PASSWORD,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 AUTH_METHOD_PASSWORD_LEN) == 0) {
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
182 if (valid_user) {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
183 svr_auth_password();
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
184 goto out;
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
185 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189
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
190 #ifdef ENABLE_SVR_PAM_AUTH
925
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
191 if (!(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
192 /* user wants to try password auth */
925
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
193 if (methodlen == AUTH_METHOD_INTERACT_LEN &&
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
194 strncmp(methodname, AUTH_METHOD_INTERACT,
bae0b34bc059 Better PAM through recursion
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
195 AUTH_METHOD_INTERACT_LEN) == 0) {
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
196 if (valid_user) {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
197 svr_auth_pam();
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
198 goto out;
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
199 }
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
200 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
201 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
202 #endif
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
203
68
eee77ac31ccc cleaning up the pubkey defines
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
204 #ifdef ENABLE_SVR_PUBKEY_AUTH
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 /* user wants to try pubkey auth */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 if (methodlen == AUTH_METHOD_PUBKEY_LEN &&
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 strncmp(methodname, AUTH_METHOD_PUBKEY,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 AUTH_METHOD_PUBKEY_LEN) == 0) {
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
209 if (valid_user) {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
210 svr_auth_pubkey();
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
211 } else {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
212 /* pubkey has no failure delay */
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
213 send_msg_userauth_failure(0, 0);
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
214 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 goto out;
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 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
219 /* nothing matched, we just fail with a delay */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 m_free(username);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 m_free(servicename);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 m_free(methodname);
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
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
229
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
230 /* Check that the username exists and isn't disallowed (root), and has a valid shell.
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 * returns DROPBEAR_SUCCESS on valid username, DROPBEAR_FAILURE on failure */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 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
233
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 char* listshell = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 char* usershell = NULL;
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 835
diff changeset
236 uid_t uid;
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
237 TRACE(("enter checkusername"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 if (userlen > MAX_USERNAME_LEN) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 /* new user or username has changed */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
243 if (ses.authstate.username == NULL ||
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
244 strcmp(username, ses.authstate.username) != 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 /* the username needs resetting */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
246 if (ses.authstate.username != NULL) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 573
diff changeset
247 dropbear_log(LOG_WARNING, "Client trying multiple usernames from %s",
158
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
248 svr_ses.addrstring);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
249 m_free(ses.authstate.username);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 authclear();
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
252 fill_passwd(username);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
253 ses.authstate.username = m_strdup(username);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 }
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 /* check that user exists */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
257 if (!ses.authstate.pw_name) {
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
258 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
259 dropbear_log(LOG_WARNING,
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 573
diff changeset
260 "Login attempt for nonexistent user from %s",
158
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
261 svr_ses.addrstring);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 return DROPBEAR_FAILURE;
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
782
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
265 /* check if we are running as non-root, and login user is different from the server */
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
266 uid = geteuid();
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
267 if (uid != 0 && uid != ses.authstate.pw_uid) {
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
268 TRACE(("running as nonroot, only server uid is allowed"))
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
269 dropbear_log(LOG_WARNING,
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
270 "Login attempt with wrong user %s from %s",
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
271 ses.authstate.pw_name,
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
272 svr_ses.addrstring);
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
273 return DROPBEAR_FAILURE;
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
274 }
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
275
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276 /* check for non-root if desired */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
277 if (svr_opts.norootlogin && ses.authstate.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
278 TRACE(("leave checkusername: root login disabled"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 dropbear_log(LOG_WARNING, "root login rejected");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 return DROPBEAR_FAILURE;
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
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
283 TRACE(("shell is %s", ses.authstate.pw_shell))
4
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 /* check that the shell is set */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
286 usershell = ses.authstate.pw_shell;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 if (usershell[0] == '\0') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 /* empty shell in /etc/passwd means /bin/sh according to passwd(5) */
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289 usershell = "/bin/sh";
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290 }
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291
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292 /* check the shell is valid. If /etc/shells doesn't exist, getusershell()
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293 * should return some standard shells like "/bin/sh" and "/bin/csh" (this
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294 * is platform-specific) */
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295 setusershell();
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296 while ((listshell = getusershell()) != NULL) {
165
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297 TRACE(("test shell is '%s'", listshell))
4
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298 if (strcmp(listshell, usershell) == 0) {
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299 /* have a match */
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300 goto goodshell;
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301 }
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302 }
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303 /* no matching shell */
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304 endusershell();
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305 TRACE(("no matching shell"))
594
a98a2138364a Improve capitalisation for all logged strings
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306 dropbear_log(LOG_WARNING, "User '%s' has invalid shell, rejected",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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307 ses.authstate.pw_name);
4
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308 return DROPBEAR_FAILURE;
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309
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310 goodshell:
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311 endusershell();
165
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312 TRACE(("matching shell"))
4
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313
464
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314 TRACE(("uid = %d", ses.authstate.pw_uid))
165
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315 TRACE(("leave checkusername"))
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316 return DROPBEAR_SUCCESS;
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317 }
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318
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319 /* Send a failure message to the client, in responds to a userauth_request.
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320 * Partial indicates whether to set the "partial success" flag,
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321 * incrfail is whether to count this failure in the failure count (which
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322 * is limited. This function also handles disconnection after too many
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323 * failures */
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324 void send_msg_userauth_failure(int partial, int incrfail) {
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325
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
326 buffer *typebuf = NULL;
4
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327
165
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328 TRACE(("enter send_msg_userauth_failure"))
4
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329
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330 CHECKCLEARTOWRITE();
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331
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332 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_FAILURE);
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333
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334 /* put a list of allowed types */
925
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335 typebuf = buf_new(55);
4
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336
33
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diff changeset
337 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
4
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338 buf_putbytes(typebuf, AUTH_METHOD_PUBKEY, AUTH_METHOD_PUBKEY_LEN);
33
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diff changeset
339 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
4
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340 buf_putbyte(typebuf, ',');
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341 }
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342 }
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343
33
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diff changeset
344 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
4
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345 buf_putbytes(typebuf, AUTH_METHOD_PASSWORD, AUTH_METHOD_PASSWORD_LEN);
925
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diff changeset
346 if (ses.authstate.authtypes & AUTH_TYPE_INTERACT) {
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diff changeset
347 buf_putbyte(typebuf, ',');
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diff changeset
348 }
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349 }
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350
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diff changeset
351 if (ses.authstate.authtypes & AUTH_TYPE_INTERACT) {
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diff changeset
352 buf_putbytes(typebuf, AUTH_METHOD_INTERACT, AUTH_METHOD_INTERACT_LEN);
4
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353 }
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354
761
ac2158e3e403 ecc kind of works, needs fixing/testing
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parents: 692
diff changeset
355 buf_putbufstring(ses.writepayload, typebuf);
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
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parents: 165
diff changeset
356
761
ac2158e3e403 ecc kind of works, needs fixing/testing
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diff changeset
357 TRACE(("auth fail: methods %d, '%.*s'", ses.authstate.authtypes,
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
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diff changeset
358 typebuf->len, typebuf->data))
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
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diff changeset
359
4
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360 buf_free(typebuf);
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361
925
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362 buf_putbool(ses.writepayload, partial);
4
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363 encrypt_packet();
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364
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365 if (incrfail) {
573
d3ea8b9672f0 - Test for pam_fail_delay() function in configure
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parents: 501
diff changeset
366 unsigned int delay;
d3ea8b9672f0 - Test for pam_fail_delay() function in configure
Matt Johnston <matt@ucc.asn.au>
parents: 501
diff changeset
367 genrandom((unsigned char*)&delay, sizeof(delay));
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
368 /* We delay for 300ms +- 50ms */
d7784616409a improve auth failure delays to avoid indicating which users exist
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diff changeset
369 delay = 250000 + (delay % 100000);
573
d3ea8b9672f0 - Test for pam_fail_delay() function in configure
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diff changeset
370 usleep(delay);
33
f789045062e6 Progressing client support
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diff changeset
371 ses.authstate.failcount++;
4
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372 }
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373
33
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diff changeset
374 if (ses.authstate.failcount >= MAX_AUTH_TRIES) {
4
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375 char * userstr;
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376 /* XXX - send disconnect ? */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
377 TRACE(("Max auth tries reached, exiting"))
4
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378
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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parents: 454
diff changeset
379 if (ses.authstate.pw_name == NULL) {
4
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380 userstr = "is invalid";
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381 } else {
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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diff changeset
382 userstr = ses.authstate.pw_name;
4
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diff changeset
383 }
158
364a75cfebab Log the IP along with auth success/fail attempts
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parents: 121
diff changeset
384 dropbear_exit("Max auth tries reached - user '%s' from %s",
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 121
diff changeset
385 userstr, svr_ses.addrstring);
4
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386 }
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diff changeset
387
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 158
diff changeset
388 TRACE(("leave send_msg_userauth_failure"))
4
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389 }
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390
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diff changeset
391 /* Send a success message to the user, and set the "authdone" flag */
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diff changeset
392 void send_msg_userauth_success() {
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diff changeset
393
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff changeset
394 TRACE(("enter send_msg_userauth_success"))
4
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395
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diff changeset
396 CHECKCLEARTOWRITE();
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diff changeset
397
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diff changeset
398 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_SUCCESS);
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diff changeset
399 encrypt_packet();
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diff changeset
400
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 483
diff changeset
401 /* authdone must be set after encrypt_packet() for
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 483
diff changeset
402 * delayed-zlib mode */
33
f789045062e6 Progressing client support
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parents: 24
diff changeset
403 ses.authstate.authdone = 1;
454
7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 300
diff changeset
404 ses.connect_time = 0;
92
2e92778dd162 Auth doesn't timeout after 5 minutes.
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
405
4
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diff changeset
406
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
407 if (ses.authstate.pw_uid == 0) {
21
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
408 ses.allowprivport = 1;
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
409 }
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
410
4
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parents:
diff changeset
411 /* Remove from the list of pre-auth sockets. Should be m_close(), since if
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parents:
diff changeset
412 * we fail, we might end up leaking connection slots, and disallow new
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parents:
diff changeset
413 * logins - a nasty situation. */
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parents:
diff changeset
414 m_close(svr_ses.childpipe);
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parents:
diff changeset
415
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 158
diff changeset
416 TRACE(("leave send_msg_userauth_success"))
4
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parents:
diff changeset
417
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diff changeset
418 }