1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM) && \
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26 | defined(NTLM_WB_ENABLED)
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27 |
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28 | /*
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29 | * NTLM details:
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30 | *
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31 | * https://davenport.sourceforge.io/ntlm.html
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32 | * https://www.innovation.ch/java/ntlm.html
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33 | */
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34 |
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35 | #define DEBUG_ME 0
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36 |
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37 | #ifdef HAVE_SYS_WAIT_H
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38 | #include <sys/wait.h>
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39 | #endif
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40 | #ifdef HAVE_SIGNAL_H
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41 | #include <signal.h>
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42 | #endif
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43 | #ifdef HAVE_PWD_H
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44 | #include <pwd.h>
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45 | #endif
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46 |
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47 | #include "urldata.h"
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48 | #include "sendf.h"
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49 | #include "select.h"
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50 | #include "vauth/ntlm.h"
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51 | #include "curl_ntlm_core.h"
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52 | #include "curl_ntlm_wb.h"
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53 | #include "url.h"
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54 | #include "strerror.h"
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55 | #include "strdup.h"
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56 | /* The last 3 #include files should be in this order */
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57 | #include "curl_printf.h"
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58 | #include "curl_memory.h"
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59 | #include "memdebug.h"
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60 |
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61 | #if DEBUG_ME
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62 | # define DEBUG_OUT(x) x
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63 | #else
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64 | # define DEBUG_OUT(x) Curl_nop_stmt
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65 | #endif
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66 |
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67 | /* Portable 'sclose_nolog' used only in child process instead of 'sclose'
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68 | to avoid fooling the socket leak detector */
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69 | #if defined(HAVE_CLOSESOCKET)
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70 | # define sclose_nolog(x) closesocket((x))
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71 | #elif defined(HAVE_CLOSESOCKET_CAMEL)
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72 | # define sclose_nolog(x) CloseSocket((x))
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73 | #else
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74 | # define sclose_nolog(x) close((x))
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75 | #endif
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76 |
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77 | void Curl_ntlm_wb_cleanup(struct connectdata *conn)
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78 | {
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79 | if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
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80 | sclose(conn->ntlm_auth_hlpr_socket);
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81 | conn->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
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82 | }
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83 |
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84 | if(conn->ntlm_auth_hlpr_pid) {
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85 | int i;
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86 | for(i = 0; i < 4; i++) {
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87 | pid_t ret = waitpid(conn->ntlm_auth_hlpr_pid, NULL, WNOHANG);
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88 | if(ret == conn->ntlm_auth_hlpr_pid || errno == ECHILD)
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89 | break;
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90 | switch(i) {
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91 | case 0:
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92 | kill(conn->ntlm_auth_hlpr_pid, SIGTERM);
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93 | break;
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94 | case 1:
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95 | /* Give the process another moment to shut down cleanly before
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96 | bringing down the axe */
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97 | Curl_wait_ms(1);
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98 | break;
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99 | case 2:
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100 | kill(conn->ntlm_auth_hlpr_pid, SIGKILL);
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101 | break;
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102 | case 3:
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103 | break;
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104 | }
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105 | }
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106 | conn->ntlm_auth_hlpr_pid = 0;
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107 | }
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108 |
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109 | free(conn->challenge_header);
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110 | conn->challenge_header = NULL;
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111 | free(conn->response_header);
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112 | conn->response_header = NULL;
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113 | }
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114 |
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115 | static CURLcode ntlm_wb_init(struct connectdata *conn, const char *userp)
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116 | {
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117 | curl_socket_t sockfds[2];
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118 | pid_t child_pid;
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119 | const char *username;
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120 | char *slash, *domain = NULL;
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121 | const char *ntlm_auth = NULL;
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122 | char *ntlm_auth_alloc = NULL;
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123 | #if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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124 | struct passwd pw, *pw_res;
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125 | char pwbuf[1024];
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126 | #endif
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127 |
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128 | /* Return if communication with ntlm_auth already set up */
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129 | if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
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130 | conn->ntlm_auth_hlpr_pid)
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131 | return CURLE_OK;
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132 |
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133 | username = userp;
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134 | /* The real ntlm_auth really doesn't like being invoked with an
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135 | empty username. It won't make inferences for itself, and expects
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136 | the client to do so (mostly because it's really designed for
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137 | servers like squid to use for auth, and client support is an
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138 | afterthought for it). So try hard to provide a suitable username
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139 | if we don't already have one. But if we can't, provide the
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140 | empty one anyway. Perhaps they have an implementation of the
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141 | ntlm_auth helper which *doesn't* need it so we might as well try */
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142 | if(!username || !username[0]) {
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143 | username = getenv("NTLMUSER");
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144 | if(!username || !username[0])
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145 | username = getenv("LOGNAME");
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146 | if(!username || !username[0])
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147 | username = getenv("USER");
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148 | #if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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149 | if((!username || !username[0]) &&
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150 | !getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res) &&
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151 | pw_res) {
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152 | username = pw.pw_name;
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153 | }
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154 | #endif
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155 | if(!username || !username[0])
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156 | username = userp;
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157 | }
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158 | slash = strpbrk(username, "\\/");
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159 | if(slash) {
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160 | domain = strdup(username);
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161 | if(!domain)
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162 | return CURLE_OUT_OF_MEMORY;
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163 | slash = domain + (slash - username);
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164 | *slash = '\0';
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165 | username = username + (slash - domain) + 1;
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166 | }
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167 |
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168 | /* For testing purposes, when DEBUGBUILD is defined and environment
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169 | variable CURL_NTLM_WB_FILE is set a fake_ntlm is used to perform
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170 | NTLM challenge/response which only accepts commands and output
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171 | strings pre-written in test case definitions */
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172 | #ifdef DEBUGBUILD
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173 | ntlm_auth_alloc = curl_getenv("CURL_NTLM_WB_FILE");
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174 | if(ntlm_auth_alloc)
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175 | ntlm_auth = ntlm_auth_alloc;
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176 | else
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177 | #endif
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178 | ntlm_auth = NTLM_WB_FILE;
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179 |
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180 | if(access(ntlm_auth, X_OK) != 0) {
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181 | failf(conn->data, "Could not access ntlm_auth: %s errno %d: %s",
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182 | ntlm_auth, errno, Curl_strerror(conn, errno));
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183 | goto done;
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184 | }
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185 |
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186 | if(socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
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187 | failf(conn->data, "Could not open socket pair. errno %d: %s",
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188 | errno, Curl_strerror(conn, errno));
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189 | goto done;
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190 | }
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191 |
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192 | child_pid = fork();
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193 | if(child_pid == -1) {
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194 | sclose(sockfds[0]);
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195 | sclose(sockfds[1]);
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196 | failf(conn->data, "Could not fork. errno %d: %s",
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197 | errno, Curl_strerror(conn, errno));
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198 | goto done;
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199 | }
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200 | else if(!child_pid) {
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201 | /*
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202 | * child process
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203 | */
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204 |
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205 | /* Don't use sclose in the child since it fools the socket leak detector */
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206 | sclose_nolog(sockfds[0]);
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207 | if(dup2(sockfds[1], STDIN_FILENO) == -1) {
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208 | failf(conn->data, "Could not redirect child stdin. errno %d: %s",
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209 | errno, Curl_strerror(conn, errno));
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210 | exit(1);
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211 | }
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212 |
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213 | if(dup2(sockfds[1], STDOUT_FILENO) == -1) {
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214 | failf(conn->data, "Could not redirect child stdout. errno %d: %s",
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215 | errno, Curl_strerror(conn, errno));
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216 | exit(1);
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217 | }
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218 |
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219 | if(domain)
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220 | execl(ntlm_auth, ntlm_auth,
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221 | "--helper-protocol", "ntlmssp-client-1",
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222 | "--use-cached-creds",
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223 | "--username", username,
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224 | "--domain", domain,
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225 | NULL);
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226 | else
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227 | execl(ntlm_auth, ntlm_auth,
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228 | "--helper-protocol", "ntlmssp-client-1",
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229 | "--use-cached-creds",
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230 | "--username", username,
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231 | NULL);
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232 |
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233 | sclose_nolog(sockfds[1]);
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234 | failf(conn->data, "Could not execl(). errno %d: %s",
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235 | errno, Curl_strerror(conn, errno));
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236 | exit(1);
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237 | }
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238 |
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239 | sclose(sockfds[1]);
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240 | conn->ntlm_auth_hlpr_socket = sockfds[0];
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241 | conn->ntlm_auth_hlpr_pid = child_pid;
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242 | free(domain);
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243 | free(ntlm_auth_alloc);
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244 | return CURLE_OK;
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245 |
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246 | done:
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247 | free(domain);
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248 | free(ntlm_auth_alloc);
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249 | return CURLE_REMOTE_ACCESS_DENIED;
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250 | }
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251 |
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252 | /* if larger than this, something is seriously wrong */
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253 | #define MAX_NTLM_WB_RESPONSE 100000
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254 |
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255 | static CURLcode ntlm_wb_response(struct connectdata *conn,
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256 | const char *input, curlntlm state)
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257 | {
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258 | char *buf = malloc(NTLM_BUFSIZE);
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259 | size_t len_in = strlen(input), len_out = 0;
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260 |
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261 | if(!buf)
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262 | return CURLE_OUT_OF_MEMORY;
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263 |
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264 | while(len_in > 0) {
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265 | ssize_t written = swrite(conn->ntlm_auth_hlpr_socket, input, len_in);
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266 | if(written == -1) {
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267 | /* Interrupted by a signal, retry it */
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268 | if(errno == EINTR)
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269 | continue;
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270 | /* write failed if other errors happen */
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271 | goto done;
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272 | }
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273 | input += written;
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274 | len_in -= written;
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275 | }
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276 | /* Read one line */
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277 | while(1) {
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278 | ssize_t size;
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279 | char *newbuf;
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280 |
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281 | size = sread(conn->ntlm_auth_hlpr_socket, buf + len_out, NTLM_BUFSIZE);
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282 | if(size == -1) {
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283 | if(errno == EINTR)
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284 | continue;
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285 | goto done;
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286 | }
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287 | else if(size == 0)
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288 | goto done;
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289 |
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290 | len_out += size;
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291 | if(buf[len_out - 1] == '\n') {
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292 | buf[len_out - 1] = '\0';
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293 | break;
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294 | }
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295 |
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296 | if(len_out > MAX_NTLM_WB_RESPONSE) {
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297 | failf(conn->data, "too large ntlm_wb response!");
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298 | free(buf);
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299 | return CURLE_OUT_OF_MEMORY;
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300 | }
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301 |
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302 | newbuf = Curl_saferealloc(buf, len_out + NTLM_BUFSIZE);
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303 | if(!newbuf)
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304 | return CURLE_OUT_OF_MEMORY;
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305 |
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306 | buf = newbuf;
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307 | }
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308 |
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309 | /* Samba/winbind installed but not configured */
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310 | if(state == NTLMSTATE_TYPE1 &&
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311 | len_out == 3 &&
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312 | buf[0] == 'P' && buf[1] == 'W')
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313 | goto done;
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314 | /* invalid response */
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315 | if(len_out < 4)
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316 | goto done;
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317 | if(state == NTLMSTATE_TYPE1 &&
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318 | (buf[0]!='Y' || buf[1]!='R' || buf[2]!=' '))
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319 | goto done;
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320 | if(state == NTLMSTATE_TYPE2 &&
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321 | (buf[0]!='K' || buf[1]!='K' || buf[2]!=' ') &&
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322 | (buf[0]!='A' || buf[1]!='F' || buf[2]!=' '))
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323 | goto done;
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324 |
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325 | conn->response_header = aprintf("NTLM %.*s", len_out - 4, buf + 3);
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326 | free(buf);
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327 | if(!conn->response_header)
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328 | return CURLE_OUT_OF_MEMORY;
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329 | return CURLE_OK;
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330 | done:
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331 | free(buf);
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332 | return CURLE_REMOTE_ACCESS_DENIED;
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333 | }
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334 |
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335 | /*
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336 | * This is for creating ntlm header output by delegating challenge/response
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337 | * to Samba's winbind daemon helper ntlm_auth.
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338 | */
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339 | CURLcode Curl_output_ntlm_wb(struct connectdata *conn,
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340 | bool proxy)
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341 | {
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342 | /* point to the address of the pointer that holds the string to send to the
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343 | server, which is for a plain host or for a HTTP proxy */
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344 | char **allocuserpwd;
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345 | /* point to the name and password for this */
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346 | const char *userp;
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347 | /* point to the correct struct with this */
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348 | struct ntlmdata *ntlm;
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349 | struct auth *authp;
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350 |
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351 | CURLcode res = CURLE_OK;
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352 | char *input;
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353 |
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354 | DEBUGASSERT(conn);
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355 | DEBUGASSERT(conn->data);
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356 |
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357 | if(proxy) {
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358 | allocuserpwd = &conn->allocptr.proxyuserpwd;
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359 | userp = conn->http_proxy.user;
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360 | ntlm = &conn->proxyntlm;
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361 | authp = &conn->data->state.authproxy;
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362 | }
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363 | else {
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364 | allocuserpwd = &conn->allocptr.userpwd;
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365 | userp = conn->user;
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366 | ntlm = &conn->ntlm;
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367 | authp = &conn->data->state.authhost;
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368 | }
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369 | authp->done = FALSE;
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370 |
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371 | /* not set means empty */
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372 | if(!userp)
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373 | userp = "";
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374 |
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375 | switch(ntlm->state) {
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376 | case NTLMSTATE_TYPE1:
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377 | default:
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378 | /* Use Samba's 'winbind' daemon to support NTLM authentication,
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379 | * by delegating the NTLM challenge/response protocol to a helper
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380 | * in ntlm_auth.
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381 | * http://devel.squid-cache.org/ntlm/squid_helper_protocol.html
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382 | * https://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
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383 | * https://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
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384 | * Preprocessor symbol 'NTLM_WB_ENABLED' is defined when this
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385 | * feature is enabled and 'NTLM_WB_FILE' symbol holds absolute
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386 | * filename of ntlm_auth helper.
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387 | * If NTLM authentication using winbind fails, go back to original
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388 | * request handling process.
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389 | */
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390 | /* Create communication with ntlm_auth */
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391 | res = ntlm_wb_init(conn, userp);
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392 | if(res)
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393 | return res;
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394 | res = ntlm_wb_response(conn, "YR\n", ntlm->state);
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395 | if(res)
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396 | return res;
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397 |
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398 | free(*allocuserpwd);
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399 | *allocuserpwd = aprintf("%sAuthorization: %s\r\n",
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400 | proxy ? "Proxy-" : "",
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401 | conn->response_header);
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402 | DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
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403 | free(conn->response_header);
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404 | if(!*allocuserpwd)
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405 | return CURLE_OUT_OF_MEMORY;
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406 | conn->response_header = NULL;
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407 | break;
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408 | case NTLMSTATE_TYPE2:
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409 | input = aprintf("TT %s\n", conn->challenge_header);
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410 | if(!input)
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411 | return CURLE_OUT_OF_MEMORY;
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412 | res = ntlm_wb_response(conn, input, ntlm->state);
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413 | free(input);
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414 | input = NULL;
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415 | if(res)
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416 | return res;
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417 |
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418 | free(*allocuserpwd);
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419 | *allocuserpwd = aprintf("%sAuthorization: %s\r\n",
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420 | proxy ? "Proxy-" : "",
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421 | conn->response_header);
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422 | DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
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423 | ntlm->state = NTLMSTATE_TYPE3; /* we sent a type-3 */
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424 | authp->done = TRUE;
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425 | Curl_ntlm_wb_cleanup(conn);
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426 | if(!*allocuserpwd)
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427 | return CURLE_OUT_OF_MEMORY;
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428 | break;
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429 | case NTLMSTATE_TYPE3:
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430 | /* connection is already authenticated,
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431 | * don't send a header in future requests */
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432 | free(*allocuserpwd);
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433 | *allocuserpwd = NULL;
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434 | authp->done = TRUE;
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435 | break;
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436 | }
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437 |
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438 | return CURLE_OK;
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439 | }
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440 |
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441 | #endif /* !CURL_DISABLE_HTTP && USE_NTLM && NTLM_WB_ENABLED */
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