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development version dev-1-7-01 from /ww/webwork/development 15-June-2001
1 #!/usr/local/bin/perl 2 3 ## $Id$ 4 5 #################################################################### 6 # Copyright @ 1995-1998 University of Rochester 7 # All Rights Reserved 8 #################################################################### 9 10 11 use lib '/ww/webwork/gage_system/webwork/system/lib/'; # mainWeBWorKDirectory 12 13 ## login.pl 14 ## password authorization script for the WeBWorK project 15 ## 16 ## To Do: 17 ## * make sure submitted class value is in list of valid classes? 18 ## * add -T for taint checks, eventually... 19 20 21 require 5.001; 22 use strict; 23 24 use Global; 25 use Auth; 26 use CGI qw(:standard); 27 28 # begin Timing code 29 use Benchmark; 30 my $beginTime = new Benchmark; 31 # end Timing code 32 33 my $Course = param('course'); 34 my $User = param('user'); 35 my $Passwd = param('passwd'); 36 my $Key = param('key'); 37 my $scriptURL = param('SCRIPTING_FILE'); # script to execute after fast relogin 38 39 # We may not have course info yet, so only get course environment if we 40 # know what course we're getting info for! 41 42 &Global::getCourseEnvironment(param('course')) if param('course'); 43 44 my $scriptDirectory = $Global::scriptDirectory; 45 require "${scriptDirectory}$Global::HTMLglue_pl"; 46 47 my $Passwd_file = &getCoursePasswordFile($Course); 48 my $Key_file = &getCourseKeyFile($Course); 49 my $permissionsFile = &getCoursePermissionsFile($Course); 50 my $practiceUser = $Global::practiceUser; 51 52 # If a valid key is specified, we've just changed password 53 # so no need to re-authorize 54 55 if ($Key && $User && $Course) { 56 &verify_key($User, $Key, $Key_file, $Course); 57 # &record_login; 58 &success_form($Key); 59 exit; 60 } 61 62 ## No course specified? You lose. 63 unless($Course ) { 64 my $error_msg = remote_host().' '.user_agent().' '.query_string(); 65 &wwerror("$0, missing course data. Refered by:" . referer(), 66 "The script did not receive the proper input data. No WeBWorK course was defined",'','',$error_msg 67 ); 68 } 69 70 71 ## 'course' specified, but we also need 'user' and 'passwd' fields 72 unless ($User && $Passwd) { 73 &Global::error('', "Can't read $Passwd_file") unless (-r $Passwd_file); 74 &login_form; 75 exit; 76 } 77 78 ## If the user is a practice user, check that no one else is currently using 79 ## that practice account 80 81 if ($User =~ /^$practiceUser/) { 82 my @currentUsers = get_current_users_from_passwordDB($Passwd_file); 83 my $user; 84 85 my $is_valid = 0; 86 foreach $user (@currentUsers) { ##check to see if $User is in password file 87 if ($user eq $User) { 88 $is_valid = 1; 89 last; 90 } 91 } 92 unless ($is_valid) { 93 &failure_form; 94 exit; 95 } 96 97 if (-e $Key_file) { ## if the keys files does not exist, they can be no conflict 98 my @activeUsers = get_active_users_from_keysDB($Key_file); 99 my $is_active = 0; 100 foreach $user (@activeUsers) { ##check to see if $User is currently active 101 if ($user eq $User) { 102 $is_active = 1; 103 $is_active = 0 if $User eq "practice666"; #code for inspections 104 last; 105 } 106 } 107 if ($is_active) { 108 &practice_failure_form; 109 exit; 110 } 111 } 112 } 113 114 115 ## we've got all the info we need, now do the authorization 116 if (&verify_password($User, $Passwd, $Passwd_file)) { 117 my $key = &new_key($User, $Key_file); 118 if (defined $scriptURL ) { # we are doing a fast relogin 119 &fast_login_form($key); 120 121 } 122 else { 123 &record_login; #Mike Gage 8/31/96 124 &success_form($key); 125 } 126 } 127 else { 128 &failure_form; 129 } 130 131 # begin Timing code 132 my $endTime = new Benchmark; 133 &Global::logTimingInfo($beginTime,$endTime,"login.pl",$Course,$User,remote_host(),user_agent()); 134 # end Timing code 135 136 exit; 137 138 #################### 139 140 sub login_form { 141 my $course = shift; 142 my $loginURL = getLoginURL(); 143 144 print &htmlTOP('WeBWorK Login Page', '', 'Pragma: no-cache'), 145 hr, 146 h1('WeBWorK Login Page'), 147 "Please enter your username and password for ", 148 b($Course), " below: ", 149 p, 150 start_form('POST', "$loginURL"), 151 hidden('course'), 152 textfield('user', '', 18), " Username", br, 153 password_field('passwd', '', 18), " Password", 154 i(" (will not be echoed)"), br, 155 p, 156 submit('Continue'), 157 end_form, end_html; 158 } 159 160 161 sub success_form { 162 my $key = shift; 163 my $user_title = "user "; 164 165 param('key', $key); # avoid CGI.pm's sticky hidden field values 166 167 my $permissions = &get_permissions($User,$permissionsFile); 168 if ($permissions == $Global::instructor_permissions) { 169 $user_title = "instructor "; 170 } 171 if ($permissions == $Global::TA_permissions) { 172 $user_title = "TA "; 173 } 174 print &htmlTOP('Login Valid'); 175 176 # create outer table: left column is status message + buttons, 177 # right-column contains info (message of the day, tips, etc.) 178 print qq{<table cellspacing="10"><tr>}; 179 180 # begin left column 181 print qq{<td valign="top" width="70%">}, 182 h1('Login Valid'), 183 "Welcome, $user_title ", b($User), ". ", 184 "You may begin working on problem sets for ", 185 b($Course), " or do other tasks.\n"; 186 187 if ($permissions == $Global::instructor_permissions) { 188 print start_form('POST', "${Global::cgiWebworkURL}profLogin.pl"), 189 p,"\n", 190 hidden('course'), "\n", 191 hidden('user'), "\n", 192 hidden('key'), "\n", 193 submit("Enter Professor's Page"), 194 end_form; 195 } 196 197 if ($permissions == $Global::TA_permissions) { 198 print start_form('POST', "${Global::cgiWebworkURL}TALogin.pl"), 199 p,"\n", 200 hidden('course'), "\n", 201 hidden('user'), "\n", 202 hidden('key'), "\n", 203 submit("Enter TA's Page"), 204 end_form; 205 } 206 207 print start_form('POST', "$Global::welcome_CGI"), 208 p,"\n", 209 hidden('course'), "\n", 210 hidden('user'), "\n", 211 hidden('key'), "\n", 212 submit('Begin Problem Sets'), 213 end_form, 214 p; 215 216 print start_form('POST', "${Global::cgiWebworkURL}change-password.pl"), 217 hidden('course'), "\n", 218 hidden('user'), "\n", 219 hidden('key'), "\n", 220 submit('Change Password'), 221 end_form; 222 223 if ($Global::allowStudentToChangeEMAddress) { 224 print start_form('POST', "${Global::cgiWebworkURL}change-email.pl"), 225 hidden('course'), "\n", 226 hidden('user'), "\n", 227 hidden('key'), "\n", 228 hidden('firstTime','firstTime'), "\n", 229 submit('Change Email Address'), 230 end_form; 231 } 232 print qq{</td><td rowspan="2" bgcolor="black"></td>}; 233 234 235 # get "system message of the day" 236 my $system_motd = ''; 237 my $system_motd_file = &Global::getSystemMOTDFile(); 238 if (-r $system_motd_file) { 239 open(MOTD, $system_motd_file); 240 while (<MOTD>) { 241 $system_motd .= $_; 242 } 243 close(MOTD); 244 } 245 $system_motd = $system_motd || 'None.'; 246 247 # get "course message of the day" 248 my $course_motd = ''; 249 my $course_motd_file = &Global::getCourseMOTDFile($Course); 250 if (-r $course_motd_file) { 251 open(MOTD, $course_motd_file); 252 while (<MOTD>) { 253 $course_motd .= $_; 254 } 255 close(MOTD); 256 } 257 $course_motd = $course_motd || 'None.'; 258 259 # now create separate "info" table in right-column 260 print qq{<td valign="top"><table border cellspacing="5" cellpadding="5">}, 261 262 # motd row 263 qq{<tr><td valign="top"><font face="helvetica,arial">}, 264 h4('WeBWorK System Message of the day:'), 265 $system_motd, 266 qq{</font></td></tr><tr>}, 267 268 # motd row 269 qq{<tr><td valign="top"><font face="helvetica,arial">}, 270 h4("$Course Message of the day:"), 271 $course_motd, 272 qq{</font></td></tr><tr>}, 273 274 # tips row 275 qq{<td valign="top"><font face="helvetica,arial">}, 276 h4('Tip for this login:'), 277 &Global::tip, 278 # start_form('POST', "${Global::cgiWebworkURL}tips.pl"), 279 # hidden('course'), "\n", 280 # hidden('user'), "\n", 281 # hidden('key'), "\n", 282 # '<SMALL>',submit('See all tips'),'</SMALL>', 283 # end_form, 284 qq{</font></td></tr></table>}, # close inner "tips" table 285 qq{</td></tr></table>}, # close outer table 286 end_html; 287 } 288 289 290 sub failure_form { 291 print &htmlTOP('Login Invalid', $Global::background_warn_url), 292 h1('Login Invalid'), 293 "Sorry ", b($User), ", you entered an invalid user/password pair.", 294 start_form('POST', url), 295 hidden('course'), 296 submit('Try again'), 297 end_form, end_html; 298 } 299 300 sub practice_failure_form { 301 ## first get some information on practice users 302 my @activeUsers = get_active_users_from_keysDB($Key_file); 303 my @currentUsers = get_current_users_from_passwordDB($Passwd_file); 304 my @activePracticeUsers = grep /^$practiceUser/, @activeUsers; 305 my @currentPracticeUsers = grep /^$practiceUser/, @currentUsers; 306 ## get a list of all non active practice users. 307 my (%mark,$user); 308 grep($mark{$_}++,@activePracticeUsers); 309 my @currentAvailablePracticeUsers = grep(!$mark{$_},@currentPracticeUsers); 310 my $numberOfAvailablePracticeUsers = @currentAvailablePracticeUsers; 311 my $numberOfCurrentPracticeUsers = @currentPracticeUsers; 312 ## get a short list of non active practice users 313 @currentAvailablePracticeUsers = @currentAvailablePracticeUsers[0..4] if 314 $numberOfAvailablePracticeUsers > 5; 315 316 ## now print form 317 print &htmlTOP('Login Failed', $Global::background_warn_url), 318 h1('Login Failed'), 319 'Sorry, the ', b($User),' account is currently being used by another user. ', 320 'You can try another ', b($practiceUser), ' account or you can try to login to the ', 321 b($User),' account at a later time. <p>', 322 "Currently, $numberOfAvailablePracticeUsers out of a total of $numberOfCurrentPracticeUsers ", 323 b($practiceUser), ' accounts are not in use and are available. For example<p>'; 324 foreach $user (@currentAvailablePracticeUsers) { 325 print "$user<br>"; 326 } 327 print '<p>are available', 328 start_form('POST', url), 329 hidden('course'), 330 submit('Try again'), 331 end_form, end_html; 332 } 333 334 335 336 sub fast_login_form { 337 my $key = shift; 338 my $user_title = "user "; 339 340 param('key', $key); # avoid CGI.pm's sticky hidden field values 341 342 my $permissions = &get_permissions($User,$permissionsFile); 343 if ($permissions == $Global::instructor_permissions) { 344 $user_title = "instructor "; 345 } 346 if ($permissions == $Global::TA_permissions) { 347 $user_title = "TA "; 348 } 349 350 print &htmlTOP('Login Valid', $Global::background_okay_url), 351 h1('Login Valid'), 352 "Fast login for $user_title ", b($User), ". ", 353 start_form('POST', $scriptURL), 354 hidden('key'), "\n"; 355 356 &CGI::ReadParse; #get the input parameters which need to be passed. 357 my $tmp_key; 358 foreach $tmp_key (keys %main::in) { # pass all of the variables from the original calling script except those below: 359 next if $tmp_key eq 'key'; # we have replaced the old key 360 next if $tmp_key eq 'passwd'; # we DO NOT want to pass this. 361 next if $tmp_key eq 'GO'; # the submit button, we don't need this 362 next if $tmp_key eq 'SCRIPTING_FILE'; # contained the URL of the original target script now in $scriptURL 363 print hidden( $tmp_key , $main::in{$tmp_key} ),"\n"; 364 } 365 366 print "Press Tab and Return -- or click GO button<BR>", 367 textfield('dummy','',0,0), submit('GO'), end_form, end_html; 368 } 369 370 371 sub record_login { 372 373 &Global::getCourseEnvironment($Course); 374 my $logsDirectory = getCourseLogsDirectory(); 375 my $logfile = "${logsDirectory}login.log"; 376 my $timestamp = scalar localtime; 377 378 $timestamp =~ /^\w+\s(.*)\s/; 379 $timestamp = $1; 380 381 open(LOG, ">>$logfile") || warn "$0: can't write to $logfile!\n"; 382 print LOG "$timestamp $User on ", remote_host(), 383 " (", user_agent(), ")\n"; 384 close(LOG); 385 chmod 0660, "$logfile"; 386 }
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