Mercurial > dropbear
annotate svr-auth.c @ 70:b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 12 Aug 2004 16:41:58 +0000 |
parents | eee77ac31ccc |
children | 2e92778dd162 |
rev | line source |
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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" |
24 | 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 */ |
33 | 42 void svr_authinitialise() { |
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43 |
33 | 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 |
33 | 54 memset(&ses.authstate, 0, sizeof(ses.authstate)); |
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55 #ifdef ENABLE_SVR_PUBKEY_AUTH |
33 | 56 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY; |
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57 #endif |
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58 #ifdef ENABLE_SVR_PASSWORD_AUTH |
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59 if (!svr_opts.noauthpass) { |
33 | 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")); |
24 | 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); |
24 | 79 buf_putstring(ses.writepayload, buf_getptr(svr_opts.banner, |
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(); |
24 | 84 buf_free(svr_opts.banner); |
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 */ |
33 | 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 */ |
24 | 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 |
68
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144 #ifdef ENABLE_SVR_PASSWORD_AUTH |
24 | 145 if (!svr_opts.noauthpass && |
33 | 146 !(svr_opts.norootpass && ses.authstate.pw->pw_uid == 0) ) { |
4
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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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149 strncmp(methodname, AUTH_METHOD_PASSWORD, |
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150 AUTH_METHOD_PASSWORD_LEN) == 0) { |
33 | 151 svr_auth_password(); |
4
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152 goto out; |
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153 } |
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154 } |
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155 #endif |
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156 |
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157 #ifdef ENABLE_SVR_PUBKEY_AUTH |
4
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158 /* user wants to try pubkey auth */ |
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159 if (methodlen == AUTH_METHOD_PUBKEY_LEN && |
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160 strncmp(methodname, AUTH_METHOD_PUBKEY, |
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161 AUTH_METHOD_PUBKEY_LEN) == 0) { |
33 | 162 svr_auth_pubkey(); |
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163 goto out; |
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164 } |
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165 #endif |
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166 |
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167 /* nothing matched, we just fail */ |
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168 send_msg_userauth_failure(0, 1); |
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169 |
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170 out: |
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171 |
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172 m_free(username); |
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173 m_free(servicename); |
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174 m_free(methodname); |
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175 } |
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176 |
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177 /* Check that the username exists, has a non-empty password, and has a valid |
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178 * shell. |
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179 * returns DROPBEAR_SUCCESS on valid username, DROPBEAR_FAILURE on failure */ |
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180 static int checkusername(unsigned char *username, unsigned int userlen) { |
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181 |
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182 char* listshell = NULL; |
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183 char* usershell = NULL; |
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184 |
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185 TRACE(("enter checkusername")); |
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186 if (userlen > MAX_USERNAME_LEN) { |
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187 return DROPBEAR_FAILURE; |
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188 } |
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189 |
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190 /* new user or username has changed */ |
33 | 191 if (ses.authstate.username == NULL || |
192 strcmp(username, ses.authstate.username) != 0) { | |
4
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193 /* the username needs resetting */ |
33 | 194 if (ses.authstate.username != NULL) { |
4
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195 dropbear_log(LOG_WARNING, "client trying multiple usernames"); |
33 | 196 m_free(ses.authstate.username); |
4
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197 } |
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198 authclear(); |
33 | 199 ses.authstate.pw = getpwnam((char*)username); |
200 ses.authstate.username = m_strdup(username); | |
201 m_free(ses.authstate.printableuser); | |
4
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202 } |
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203 |
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204 /* check that user exists */ |
33 | 205 if (ses.authstate.pw == NULL) { |
4
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206 TRACE(("leave checkusername: user '%s' doesn't exist", username)); |
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207 dropbear_log(LOG_WARNING, |
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208 "login attempt for nonexistent user"); |
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209 send_msg_userauth_failure(0, 1); |
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210 return DROPBEAR_FAILURE; |
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211 } |
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212 |
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213 /* We can set it once we know its a real user */ |
33 | 214 ses.authstate.printableuser = m_strdup(ses.authstate.pw->pw_name); |
4
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215 |
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216 /* check for non-root if desired */ |
33 | 217 if (svr_opts.norootlogin && ses.authstate.pw->pw_uid == 0) { |
4
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218 TRACE(("leave checkusername: root login disabled")); |
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219 dropbear_log(LOG_WARNING, "root login rejected"); |
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220 send_msg_userauth_failure(0, 1); |
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221 return DROPBEAR_FAILURE; |
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222 } |
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223 |
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224 /* check for an empty password */ |
33 | 225 if (ses.authstate.pw->pw_passwd[0] == '\0') { |
4
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226 TRACE(("leave checkusername: empty pword")); |
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227 dropbear_log(LOG_WARNING, "user '%s' has blank password, rejected", |
33 | 228 ses.authstate.printableuser); |
4
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229 send_msg_userauth_failure(0, 1); |
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230 return DROPBEAR_FAILURE; |
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231 } |
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232 |
33 | 233 TRACE(("shell is %s", ses.authstate.pw->pw_shell)); |
4
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234 |
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235 /* check that the shell is set */ |
33 | 236 usershell = ses.authstate.pw->pw_shell; |
4
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237 if (usershell[0] == '\0') { |
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238 /* empty shell in /etc/passwd means /bin/sh according to passwd(5) */ |
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239 usershell = "/bin/sh"; |
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240 } |
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241 |
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242 /* check the shell is valid. If /etc/shells doesn't exist, getusershell() |
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243 * should return some standard shells like "/bin/sh" and "/bin/csh" (this |
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244 * is platform-specific) */ |
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245 setusershell(); |
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246 while ((listshell = getusershell()) != NULL) { |
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247 TRACE(("test shell is '%s'", listshell)); |
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248 if (strcmp(listshell, usershell) == 0) { |
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249 /* have a match */ |
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250 goto goodshell; |
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|
251 } |
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252 } |
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253 /* no matching shell */ |
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254 endusershell(); |
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255 TRACE(("no matching shell")); |
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256 dropbear_log(LOG_WARNING, "user '%s' has invalid shell, rejected", |
33 | 257 ses.authstate.printableuser); |
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258 send_msg_userauth_failure(0, 1); |
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259 return DROPBEAR_FAILURE; |
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260 |
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261 goodshell: |
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262 endusershell(); |
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263 TRACE(("matching shell")); |
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264 |
33 | 265 TRACE(("uid = %d", ses.authstate.pw->pw_uid)); |
4
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266 TRACE(("leave checkusername")); |
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267 return DROPBEAR_SUCCESS; |
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268 |
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269 } |
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270 |
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271 /* Send a failure message to the client, in responds to a userauth_request. |
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272 * Partial indicates whether to set the "partial success" flag, |
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273 * incrfail is whether to count this failure in the failure count (which |
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274 * is limited. This function also handles disconnection after too many |
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275 * failures */ |
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276 void send_msg_userauth_failure(int partial, int incrfail) { |
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277 |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
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68
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278 buffer *typebuf = NULL; |
4
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279 |
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280 TRACE(("enter send_msg_userauth_failure")); |
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281 |
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282 CHECKCLEARTOWRITE(); |
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283 |
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284 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_FAILURE); |
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285 |
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286 /* put a list of allowed types */ |
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287 typebuf = buf_new(30); /* long enough for PUBKEY and PASSWORD */ |
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288 |
33 | 289 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) { |
4
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290 buf_putbytes(typebuf, AUTH_METHOD_PUBKEY, AUTH_METHOD_PUBKEY_LEN); |
33 | 291 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) { |
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292 buf_putbyte(typebuf, ','); |
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293 } |
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294 } |
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295 |
33 | 296 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) { |
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297 buf_putbytes(typebuf, AUTH_METHOD_PASSWORD, AUTH_METHOD_PASSWORD_LEN); |
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298 } |
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299 |
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300 buf_setpos(typebuf, 0); |
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301 buf_putstring(ses.writepayload, buf_getptr(typebuf, typebuf->len), |
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302 typebuf->len); |
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303 buf_free(typebuf); |
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304 |
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305 buf_putbyte(ses.writepayload, partial ? 1 : 0); |
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306 encrypt_packet(); |
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307 |
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308 TRACE(("auth fail: methods %d, '%s'", ses.authstate.authtypes, |
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309 buf_getptr(typebuf, typebuf->len))); |
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310 |
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311 if (incrfail) { |
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312 usleep(300000); /* XXX improve this */ |
33 | 313 ses.authstate.failcount++; |
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314 } |
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315 |
33 | 316 if (ses.authstate.failcount >= MAX_AUTH_TRIES) { |
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317 char * userstr; |
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318 /* XXX - send disconnect ? */ |
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319 TRACE(("Max auth tries reached, exiting")); |
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320 |
33 | 321 if (ses.authstate.printableuser == NULL) { |
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322 userstr = "is invalid"; |
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323 } else { |
33 | 324 userstr = ses.authstate.printableuser; |
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325 } |
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326 dropbear_exit("Max auth tries reached - user %s", userstr); |
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327 } |
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328 |
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329 TRACE(("leave send_msg_userauth_failure")); |
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330 } |
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331 |
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332 /* Send a success message to the user, and set the "authdone" flag */ |
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333 void send_msg_userauth_success() { |
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334 |
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335 TRACE(("enter send_msg_userauth_success")); |
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336 |
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337 CHECKCLEARTOWRITE(); |
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338 |
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339 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_SUCCESS); |
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340 encrypt_packet(); |
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341 |
33 | 342 ses.authstate.authdone = 1; |
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343 |
33 | 344 if (ses.authstate.pw->pw_uid == 0) { |
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345 ses.allowprivport = 1; |
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346 } |
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347 |
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348 /* Remove from the list of pre-auth sockets. Should be m_close(), since if |
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349 * we fail, we might end up leaking connection slots, and disallow new |
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350 * logins - a nasty situation. */ |
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351 m_close(svr_ses.childpipe); |
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352 |
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353 TRACE(("leave send_msg_userauth_success")); |
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354 |
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355 } |