1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # Functions for use by content handlers:
5: #
6: # plaintext(short) : plain text explanation of short term
7: # fileembstyle(ext) : embed style in page for file extension
8: # filedescription(ext) : descriptor text for file extension
9: # allowed(short,url) : returns codes for allowed actions
10: # F: full access
11: # U,I,K: authentication modes (cxx only)
12: # '': forbidden
13: # 1: user needs to choose course
14: # 2: browse allowed
15: # definerole(rolename,sys,dom,cou) : define a custom role rolename
16: # set priviledges in format of lonTabs/roles.tab for
17: # system, domain and course level,
18: # assignrole(udom,uname,url,role,end,start) : give a role to a user for the
19: # level given by url. Optional start and end dates
20: # (leave empty string or zero for "no date")
21: # assigncustomrole (udom,uname,url,rdom,rnam,rolename,end,start) : give a
22: # custom role to a user for the level given by url.
23: # Specify name and domain of role author, and role name
24: # revokerole (udom,uname,url,role) : Revoke a role for url
25: # revokecustomrole (udom,uname,url,rdom,rnam,rolename) : Revoke a custom role
26: # appenv(hash) : adds hash to session environment
27: # store(hash) : stores hash permanently for this url
28: # cstore(hash) : critical store
29: # restore : returns hash for this url
30: # eget(namesp,array) : returns hash with keys from array filled in from namesp
31: # get(namesp,array) : returns hash with keys from array filled in from namesp
32: # del(namesp,array) : deletes keys out of array from namesp
33: # put(namesp,hash) : stores hash in namesp
34: # cput(namesp,hash) : critical put
35: # dump(namesp) : dumps the complete namespace into a hash
36: # ssi(url,hash) : does a complete request cycle on url to localhost, posts
37: # hash
38: # coursedescription(id) : returns and caches course description for id
39: # repcopy(filename) : replicate file
40: # dirlist(url) : gets a directory listing
41: # directcondval(index) : reading condition value of single condition from
42: # state string
43: # condval(index) : value of condition index based on state
44: # varval(name) : value of a variable
45: # refreshstate() : refresh the state information string
46: # symblist(map,hash) : Updates symbolic storage links
47: # symbread([filename]) : returns the data handle (filename optional)
48: # rndseed() : returns a random seed
49: # getfile(filename) : returns the contents of filename, or a -1 if it can't
50: # be found, replicates and subscribes to the file
51: # filelocation(dir,file) : returns a farily clean absolute reference to file
52: # from the directory dir
53: # hreflocation(dir,file) : same as filelocation, but for hrefs
54: # log(domain,user,home,msg) : write to permanent log for user
55: #
56: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
57: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
58: # 11/8,11/16,11/18,11/22,11/23,12/22,
59: # 01/06,01/13,02/24,02/28,02/29,
60: # 03/01,03/02,03/06,03/07,03/13,
61: # 04/05,05/29,05/31,06/01,
62: # 06/05,06/26 Gerd Kortemeyer
63: # 06/26 Ben Tyszka
64: # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
65: # 08/14 Ben Tyszka
66: # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
67: # 10/04 Gerd Kortemeyer
68: # 10/04 Guy Albertelli
69: # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25 Gerd Kortemeyer
70:
71: package Apache::lonnet;
72:
73: use strict;
74: use Apache::File;
75: use LWP::UserAgent();
76: use HTTP::Headers;
77: use vars
78: qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp %fe %fd $readit);
79: use IO::Socket;
80: use GDBM_File;
81: use Apache::Constants qw(:common :http);
82:
83: # --------------------------------------------------------------------- Logging
84:
85: sub logthis {
86: my $message=shift;
87: my $execdir=$perlvar{'lonDaemons'};
88: my $now=time;
89: my $local=localtime($now);
90: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
91: print $fh "$local ($$): $message\n";
92: return 1;
93: }
94:
95: sub logperm {
96: my $message=shift;
97: my $execdir=$perlvar{'lonDaemons'};
98: my $now=time;
99: my $local=localtime($now);
100: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
101: print $fh "$now:$message:$local\n";
102: return 1;
103: }
104:
105: # -------------------------------------------------- Non-critical communication
106: sub subreply {
107: my ($cmd,$server)=@_;
108: my $peerfile="$perlvar{'lonSockDir'}/$server";
109: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
110: Type => SOCK_STREAM,
111: Timeout => 10)
112: or return "con_lost";
113: print $client "$cmd\n";
114: my $answer=<$client>;
115: if (!$answer) { $answer="con_lost"; }
116: chomp($answer);
117: return $answer;
118: }
119:
120: sub reply {
121: my ($cmd,$server)=@_;
122: my $answer=subreply($cmd,$server);
123: if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
124: if (($answer=~/^error:/) || ($answer=~/^refused/) ||
125: ($answer=~/^rejected/)) {
126: &logthis("<font color=blue>WARNING:".
127: " $cmd to $server returned $answer</font>");
128: }
129: return $answer;
130: }
131:
132: # ----------------------------------------------------------- Send USR1 to lonc
133:
134: sub reconlonc {
135: my $peerfile=shift;
136: &logthis("Trying to reconnect for $peerfile");
137: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
138: if (my $fh=Apache::File->new("$loncfile")) {
139: my $loncpid=<$fh>;
140: chomp($loncpid);
141: if (kill 0 => $loncpid) {
142: &logthis("lonc at pid $loncpid responding, sending USR1");
143: kill USR1 => $loncpid;
144: sleep 1;
145: if (-e "$peerfile") { return; }
146: &logthis("$peerfile still not there, give it another try");
147: sleep 5;
148: if (-e "$peerfile") { return; }
149: &logthis(
150: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
151: } else {
152: &logthis(
153: "<font color=blue>WARNING:".
154: " lonc at pid $loncpid not responding, giving up</font>");
155: }
156: } else {
157: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
158: }
159: }
160:
161: # ------------------------------------------------------ Critical communication
162:
163: sub critical {
164: my ($cmd,$server)=@_;
165: my $answer=reply($cmd,$server);
166: if ($answer eq 'con_lost') {
167: my $pingreply=reply('ping',$server);
168: &reconlonc("$perlvar{'lonSockDir'}/$server");
169: my $pongreply=reply('pong',$server);
170: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
171: $answer=reply($cmd,$server);
172: if ($answer eq 'con_lost') {
173: my $now=time;
174: my $middlename=$cmd;
175: $middlename=substr($middlename,0,16);
176: $middlename=~s/\W//g;
177: my $dfilename=
178: "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
179: {
180: my $dfh;
181: if ($dfh=Apache::File->new(">$dfilename")) {
182: print $dfh "$cmd\n";
183: }
184: }
185: sleep 2;
186: my $wcmd='';
187: {
188: my $dfh;
189: if ($dfh=Apache::File->new("$dfilename")) {
190: $wcmd=<$dfh>;
191: }
192: }
193: chomp($wcmd);
194: if ($wcmd eq $cmd) {
195: &logthis("<font color=blue>WARNING: ".
196: "Connection buffer $dfilename: $cmd</font>");
197: &logperm("D:$server:$cmd");
198: return 'con_delayed';
199: } else {
200: &logthis("<font color=red>CRITICAL:"
201: ." Critical connection failed: $server $cmd</font>");
202: &logperm("F:$server:$cmd");
203: return 'con_failed';
204: }
205: }
206: }
207: return $answer;
208: }
209:
210: # ---------------------------------------------------------- Append Environment
211:
212: sub appenv {
213: my %newenv=@_;
214: map {
215: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
216: &logthis("<font color=blue>WARNING: ".
217: "Attempt to modify environment ".$_." to ".$newenv{$_});
218: delete($newenv{$_});
219: } else {
220: $ENV{$_}=$newenv{$_};
221: }
222: } keys %newenv;
223: my @oldenv;
224: {
225: my $fh;
226: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
227: return 'error';
228: }
229: @oldenv=<$fh>;
230: }
231: for (my $i=0; $i<=$#oldenv; $i++) {
232: chomp($oldenv[$i]);
233: if ($oldenv[$i] ne '') {
234: my ($name,$value)=split(/=/,$oldenv[$i]);
235: unless (defined($newenv{$name})) {
236: $newenv{$name}=$value;
237: }
238: }
239: }
240: {
241: my $fh;
242: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
243: return 'error';
244: }
245: my $newname;
246: foreach $newname (keys %newenv) {
247: print $fh "$newname=$newenv{$newname}\n";
248: }
249: }
250: return 'ok';
251: }
252:
253: # ------------------------------ Find server with least workload from spare.tab
254:
255: sub spareserver {
256: my $tryserver;
257: my $spareserver='';
258: my $lowestserver=100;
259: foreach $tryserver (keys %spareid) {
260: my $answer=reply('load',$tryserver);
261: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
262: $spareserver="http://$hostname{$tryserver}";
263: $lowestserver=$answer;
264: }
265: }
266: return $spareserver;
267: }
268:
269: # --------- Try to authenticate user from domain's lib servers (first this one)
270:
271: sub authenticate {
272: my ($uname,$upass,$udom)=@_;
273: $upass=escape($upass);
274: if (($perlvar{'lonRole'} eq 'library') &&
275: ($udom eq $perlvar{'lonDefDomain'})) {
276: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
277: if ($answer =~ /authorized/) {
278: if ($answer eq 'authorized') {
279: &logthis("User $uname at $udom authorized by local server");
280: return $perlvar{'lonHostID'};
281: }
282: if ($answer eq 'non_authorized') {
283: &logthis("User $uname at $udom rejected by local server");
284: return 'no_host';
285: }
286: }
287: }
288:
289: my $tryserver;
290: foreach $tryserver (keys %libserv) {
291: if ($hostdom{$tryserver} eq $udom) {
292: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
293: if ($answer =~ /authorized/) {
294: if ($answer eq 'authorized') {
295: &logthis("User $uname at $udom authorized by $tryserver");
296: return $tryserver;
297: }
298: if ($answer eq 'non_authorized') {
299: &logthis("User $uname at $udom rejected by $tryserver");
300: return 'no_host';
301: }
302: }
303: }
304: }
305: &logthis("User $uname at $udom could not be authenticated");
306: return 'no_host';
307: }
308:
309: # ---------------------- Find the homebase for a user from domain's lib servers
310:
311: sub homeserver {
312: my ($uname,$udom)=@_;
313:
314: my $index="$uname:$udom";
315: if ($homecache{$index}) { return "$homecache{$index}"; }
316:
317: my $tryserver;
318: foreach $tryserver (keys %libserv) {
319: if ($hostdom{$tryserver} eq $udom) {
320: my $answer=reply("home:$udom:$uname",$tryserver);
321: if ($answer eq 'found') {
322: $homecache{$index}=$tryserver;
323: return $tryserver;
324: }
325: }
326: }
327: return 'no_host';
328: }
329:
330: # ----------------------------- Subscribe to a resource, return URL if possible
331:
332: sub subscribe {
333: my $fname=shift;
334: my $author=$fname;
335: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
336: my ($udom,$uname)=split(/\//,$author);
337: my $home=homeserver($uname,$udom);
338: if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
339: return 'not_found';
340: }
341: my $answer=reply("sub:$fname",$home);
342: return $answer;
343: }
344:
345: # -------------------------------------------------------------- Replicate file
346:
347: sub repcopy {
348: my $filename=shift;
349: $filename=~s/\/+/\//g;
350: my $transname="$filename.in.transfer";
351: if ((-e $filename) || (-e $transname)) { return OK; }
352: my $remoteurl=subscribe($filename);
353: if ($remoteurl eq 'con_lost') {
354: &logthis("Subscribe returned con_lost: $filename");
355: return HTTP_SERVICE_UNAVAILABLE;
356: } elsif ($remoteurl eq 'not_found') {
357: &logthis("Subscribe returned not_found: $filename");
358: return HTTP_NOT_FOUND;
359: } elsif ($remoteurl eq 'rejected') {
360: &logthis("Subscribe returned rejected: $filename");
361: return FORBIDDEN;
362: } elsif ($remoteurl eq 'directory') {
363: return OK;
364: } else {
365: my @parts=split(/\//,$filename);
366: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
367: if ($path ne "$perlvar{'lonDocRoot'}/res") {
368: &logthis("Malconfiguration for replication: $filename");
369: return HTTP_BAD_REQUEST;
370: }
371: my $count;
372: for ($count=5;$count<$#parts;$count++) {
373: $path.="/$parts[$count]";
374: if ((-e $path)!=1) {
375: mkdir($path,0777);
376: }
377: }
378: my $ua=new LWP::UserAgent;
379: my $request=new HTTP::Request('GET',"$remoteurl");
380: my $response=$ua->request($request,$transname);
381: if ($response->is_error()) {
382: unlink($transname);
383: my $message=$response->status_line;
384: &logthis("<font color=blue>WARNING:"
385: ." LWP get: $message: $filename</font>");
386: return HTTP_SERVICE_UNAVAILABLE;
387: } else {
388: if ($remoteurl!~/\.meta$/) {
389: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
390: my $mresponse=$ua->request($mrequest,$filename.'.meta');
391: if ($mresponse->is_error()) {
392: unlink($filename.'.meta');
393: &logthis(
394: "<font color=yellow>INFO: No metadata: $filename</font>");
395: }
396: }
397: rename($transname,$filename);
398: return OK;
399: }
400: }
401: }
402:
403: # --------------------------------------------------------- Server Side Include
404:
405: sub ssi {
406:
407: my ($fn,%form)=@_;
408:
409: my $ua=new LWP::UserAgent;
410:
411: my $request;
412:
413: if (%form) {
414: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
415: $request->content(join '&', map { "$_=$form{$_}" } keys %form);
416: } else {
417: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
418: }
419:
420: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
421: my $response=$ua->request($request);
422:
423: return $response->content;
424: }
425:
426: # ------------------------------------------------------------------------- Log
427:
428: sub log {
429: my ($dom,$nam,$hom,$what)=@_;
430: return critical("log:$dom:$nam:$what",$hom);
431: }
432:
433: # ----------------------------------------------------------------------- Store
434:
435: sub store {
436: my %storehash=@_;
437: my $symb;
438: unless ($symb=escape(&symbread())) { return ''; }
439: my $namespace;
440: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
441: my $namevalue='';
442: map {
443: $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
444: } keys %storehash;
445: $namevalue=~s/\&$//;
446: return reply(
447: "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
448: "$ENV{'user.home'}");
449: }
450:
451: # -------------------------------------------------------------- Critical Store
452:
453: sub cstore {
454: my %storehash=@_;
455: my $symb;
456: unless ($symb=escape(&symbread())) { return ''; }
457: my $namespace;
458: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
459: my $namevalue='';
460: map {
461: $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
462: } keys %storehash;
463: $namevalue=~s/\&$//;
464: return critical(
465: "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
466: "$ENV{'user.home'}");
467: }
468:
469: # --------------------------------------------------------------------- Restore
470:
471: sub restore {
472: my $symb;
473: unless ($symb=escape(&symbread())) { return ''; }
474: my $namespace;
475: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
476: my $answer=reply(
477: "restore:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb",
478: "$ENV{'user.home'}");
479: my %returnhash=();
480: map {
481: my ($name,$value)=split(/\=/,$_);
482: $returnhash{&unescape($name)}=&unescape($value);
483: } split(/\&/,$answer);
484: map {
485: $returnhash{$_}=$returnhash{$returnhash{'version'}.':'.$_};
486: } split(/\:/,$returnhash{$returnhash{'version'}.':keys'});
487: return %returnhash;
488: }
489:
490: # ---------------------------------------------------------- Course Description
491:
492: sub coursedescription {
493: my $courseid=shift;
494: $courseid=~s/^\///;
495: my ($cdomain,$cnum)=split(/\//,$courseid);
496: my $chome=homeserver($cnum,$cdomain);
497: if ($chome ne 'no_host') {
498: my $rep=reply("dump:$cdomain:$cnum:environment",$chome);
499: if ($rep ne 'con_lost') {
500: my %cachehash=();
501: my %returnhash=('home' => $chome,
502: 'domain' => $cdomain,
503: 'num' => $cnum);
504: map {
505: my ($name,$value)=split(/\=/,$_);
506: $name=&unescape($name);
507: $value=&unescape($value);
508: $returnhash{$name}=$value;
509: if ($name eq 'description') {
510: $cachehash{$courseid}=$value;
511: }
512: } split(/\&/,$rep);
513: $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
514: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
515: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
516: put ('coursedescriptions',%cachehash);
517: return %returnhash;
518: }
519: }
520: return ();
521: }
522:
523: # -------------------------------------------------------- Get user priviledges
524:
525: sub rolesinit {
526: my ($domain,$username,$authhost)=@_;
527: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
528: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
529: my %allroles=();
530: my %thesepriv=();
531: my $now=time;
532: my $userroles="user.login.time=$now\n";
533: my $thesestr;
534:
535: if ($rolesdump ne '') {
536: map {
537: if ($_!~/^rolesdef\&/) {
538: my ($area,$role)=split(/=/,$_);
539: $area=~s/\_\w\w$//;
540: my ($trole,$tend,$tstart)=split(/_/,$role);
541: $userroles.='user.role.'.$trole.'.'.$area.'='.
542: $tstart.'.'.$tend."\n";
543: if ($tend!=0) {
544: if ($tend<$now) {
545: $trole='';
546: }
547: }
548: if ($tstart!=0) {
549: if ($tstart>$now) {
550: $trole='';
551: }
552: }
553: if (($area ne '') && ($trole ne '')) {
554: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
555: if ($trole =~ /^cr\//) {
556: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
557: my $homsvr=homeserver($rauthor,$rdomain);
558: if ($hostname{$homsvr} ne '') {
559: my $roledef=
560: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
561: $homsvr);
562: if (($roledef ne 'con_lost') && ($roledef ne '')) {
563: my ($syspriv,$dompriv,$coursepriv)=
564: split(/\_/,unescape($roledef));
565: $allroles{'/'}.=':'.$syspriv;
566: if ($tdomain ne '') {
567: $allroles{'/'.$tdomain.'/'}.=':'.$dompriv;
568: if ($trest ne '') {
569: $allroles{$area}.=':'.$coursepriv;
570: }
571: }
572: }
573: }
574: } else {
575: $allroles{'/'}.=':'.$pr{$trole.':s'};
576: if ($tdomain ne '') {
577: $allroles{'/'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
578: if ($trest ne '') {
579: $allroles{$area}.=':'.$pr{$trole.':c'};
580: }
581: }
582: }
583: }
584: }
585: } split(/&/,$rolesdump);
586: map {
587: %thesepriv=();
588: map {
589: if ($_ ne '') {
590: my ($priviledge,$restrictions)=split(/&/,$_);
591: if ($restrictions eq '') {
592: $thesepriv{$priviledge}='F';
593: } else {
594: if ($thesepriv{$priviledge} ne 'F') {
595: $thesepriv{$priviledge}.=$restrictions;
596: }
597: }
598: }
599: } split(/:/,$allroles{$_});
600: $thesestr='';
601: map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
602: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
603: } keys %allroles;
604: }
605: return $userroles;
606: }
607:
608: # --------------------------------------------------------------- get interface
609:
610: sub get {
611: my ($namespace,@storearr)=@_;
612: my $items='';
613: map {
614: $items.=escape($_).'&';
615: } @storearr;
616: $items=~s/\&$//;
617: my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
618: $ENV{'user.home'});
619: my @pairs=split(/\&/,$rep);
620: my %returnhash=();
621: my $i=0;
622: map {
623: $returnhash{$_}=unescape($pairs[$i]);
624: $i++;
625: } @storearr;
626: return %returnhash;
627: }
628:
629: # --------------------------------------------------------------- del interface
630:
631: sub del {
632: my ($namespace,@storearr)=@_;
633: my $items='';
634: map {
635: $items.=escape($_).'&';
636: } @storearr;
637: $items=~s/\&$//;
638: return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
639: $ENV{'user.home'});
640: }
641:
642: # -------------------------------------------------------------- dump interface
643:
644: sub dump {
645: my $namespace=shift;
646: my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
647: $ENV{'user.home'});
648: my @pairs=split(/\&/,$rep);
649: my %returnhash=();
650: map {
651: my ($key,$value)=split(/=/,$_);
652: $returnhash{unescape($key)}=unescape($value);
653: } @pairs;
654: return %returnhash;
655: }
656:
657: # --------------------------------------------------------------- put interface
658:
659: sub put {
660: my ($namespace,%storehash)=@_;
661: my $items='';
662: map {
663: $items.=escape($_).'='.escape($storehash{$_}).'&';
664: } keys %storehash;
665: $items=~s/\&$//;
666: return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
667: $ENV{'user.home'});
668: }
669:
670: # ------------------------------------------------------ critical put interface
671:
672: sub cput {
673: my ($namespace,%storehash)=@_;
674: my $items='';
675: map {
676: $items.=escape($_).'='.escape($storehash{$_}).'&';
677: } keys %storehash;
678: $items=~s/\&$//;
679: return critical
680: ("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
681: $ENV{'user.home'});
682: }
683:
684: # -------------------------------------------------------------- eget interface
685:
686: sub eget {
687: my ($namespace,@storearr)=@_;
688: my $items='';
689: map {
690: $items.=escape($_).'&';
691: } @storearr;
692: $items=~s/\&$//;
693: my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
694: $ENV{'user.home'});
695: my @pairs=split(/\&/,$rep);
696: my %returnhash=();
697: my $i=0;
698: map {
699: $returnhash{$_}=unescape($pairs[$i]);
700: $i++;
701: } @storearr;
702: return %returnhash;
703: }
704:
705: # ------------------------------------------------- Check for a user priviledge
706:
707: sub allowed {
708: my ($priv,$uri)=@_;
709: $uri=~s/^\/res//;
710: $uri=~s/^\///;
711:
712: # Free bre access to adm resources
713:
714: if (($uri=~/^adm\//) && ($priv eq 'bre')) {
715: return 'F';
716: }
717:
718: # Gather priviledges over system and domain
719:
720: my $thisallowed='';
721: if ($ENV{'user.priv./'}=~/$priv\&([^\:]*)/) {
722: $thisallowed.=$1;
723: }
724: if ($ENV{'user.priv./'.(split(/\//,$uri))[0].'/'}=~/$priv\&([^\:]*)/) {
725: $thisallowed.=$1;
726: }
727:
728: # Full access at system or domain level? Exit.
729:
730: if ($thisallowed=~/F/) {
731: return 'F';
732: }
733:
734: # The user does not have full access at system or domain level
735: # Course level access control
736:
737: # uri itself refering to a course?
738:
739: if ($uri=~/\.course$/) {
740: if ($ENV{'user.priv./'.$uri}=~/$priv\&([^\:]*)/) {
741: $thisallowed.=$1;
742: }
743: # Full access on course level? Exit.
744: if ($thisallowed=~/F/) {
745: return 'F';
746: }
747:
748: # uri is refering to an individual resource; user needs to be in a course
749:
750: } else {
751:
752: unless(defined($ENV{'request.course.id'})) {
753: return '1';
754: }
755:
756: # Get access priviledges for course
757:
758: if ($ENV{'user.priv./'.$ENV{'request.course.id'}}=~/$priv\&([^\:]*)/) {
759: $thisallowed.=$1;
760: }
761:
762: # See if resource or referer is part of this course
763:
764: my @uriparts=split(/\//,$uri);
765: my $urifile=$uriparts[$#uriparts];
766: $urifile=~/\.(\w+)$/;
767: my $uritype=$1;
768: $#uriparts--;
769: my $uripath=join('/',@uriparts);
770: my $uricond=-1;
771: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$uripath}=~
772: /\&$urifile\:(\d+)\&/) {
773: $uricond=$1;
774: } elsif (($fe{$uritype} eq 'emb') || ($fe{$uritype} eq 'img')) {
775: my $refuri=$ENV{'HTTP_REFERER'};
776: $refuri=~s/^\/res//;
777: $refuri=~s/^\///;
778: @uriparts=split(/\//,$refuri);
779: $urifile=$uriparts[$#uriparts];
780: $#uriparts--;
781: $uripath=join('/',@uriparts);
782: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$uripath}=~
783: /\&$urifile\:(\d+)\&/) {
784: $uricond=$1;
785: }
786: }
787:
788: if ($uricond>=0) {
789:
790: # The resource is part of the course
791: # If user had full access on course level, go ahead
792:
793: if ($thisallowed=~/F/) {
794: return 'F';
795: }
796:
797: # Restricted by state?
798:
799: if ($thisallowed=~/X/) {
800: if (&condval($uricond)) {
801: return '2';
802: } else {
803: return '';
804: }
805: }
806: }
807: }
808: return $thisallowed;
809: }
810:
811: # ---------------------------------------------------------- Refresh State Info
812:
813: sub refreshstate {
814: }
815:
816: # ----------------------------------------------------------------- Define Role
817:
818: sub definerole {
819: if (allowed('mcr','/')) {
820: my ($rolename,$sysrole,$domrole,$courole)=@_;
821: map {
822: my ($crole,$cqual)=split(/\&/,$_);
823: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
824: if ($pr{'cr:s'}=~/$crole\&/) {
825: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
826: return "refused:s:$crole&$cqual";
827: }
828: }
829: } split('/',$sysrole);
830: map {
831: my ($crole,$cqual)=split(/\&/,$_);
832: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
833: if ($pr{'cr:d'}=~/$crole\&/) {
834: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
835: return "refused:d:$crole&$cqual";
836: }
837: }
838: } split('/',$domrole);
839: map {
840: my ($crole,$cqual)=split(/\&/,$_);
841: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
842: if ($pr{'cr:c'}=~/$crole\&/) {
843: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
844: return "refused:c:$crole&$cqual";
845: }
846: }
847: } split('/',$courole);
848: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
849: "$ENV{'user.domain'}:$ENV{'user.name'}:".
850: "rolesdef_$rolename=".
851: escape($sysrole.'_'.$domrole.'_'.$courole);
852: return reply($command,$ENV{'user.home'});
853: } else {
854: return 'refused';
855: }
856: }
857:
858: # ------------------------------------------------------------------ Plain Text
859:
860: sub plaintext {
861: my $short=shift;
862: return $prp{$short};
863: }
864:
865: # ------------------------------------------------------------------ Plain Text
866:
867: sub fileembstyle {
868: my $ending=shift;
869: return $fe{$ending};
870: }
871:
872: # ------------------------------------------------------------ Description Text
873:
874: sub filedecription {
875: my $ending=shift;
876: return $fd{$ending};
877: }
878:
879: # ----------------------------------------------------------------- Assign Role
880:
881: sub assignrole {
882: my ($udom,$uname,$url,$role,$end,$start)=@_;
883: my $mrole;
884: $url=declutter($url);
885: if ($role =~ /^cr\//) {
886: unless ($url=~/\.course$/) { return 'invalid'; }
887: unless (allowed('ccr',$url)) { return 'refused'; }
888: $mrole='cr';
889: } else {
890: unless (($url=~/\.course$/) || ($url=~/\/$/)) { return 'invalid'; }
891: unless (allowed('c'+$role)) { return 'refused'; }
892: $mrole=$role;
893: }
894: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
895: "$udom:$uname:$url".'_'."$mrole=$role";
896: if ($end) { $command.='_$end'; }
897: if ($start) {
898: if ($end) {
899: $command.='_$start';
900: } else {
901: $command.='_0_$start';
902: }
903: }
904: return &reply($command,&homeserver($uname,$udom));
905: }
906:
907: # ---------------------------------------------------------- Assign Custom Role
908:
909: sub assigncustomrole {
910: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
911: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
912: $end,$start);
913: }
914:
915: # ----------------------------------------------------------------- Revoke Role
916:
917: sub revokerole {
918: my ($udom,$uname,$url,$role)=@_;
919: my $now=time;
920: return &assignrole($udom,$uname,$url,$role,$now);
921: }
922:
923: # ---------------------------------------------------------- Revoke Custom Role
924:
925: sub revokecustomrole {
926: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
927: my $now=time;
928: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
929: }
930:
931: # ------------------------------------------------------------ Directory lister
932:
933: sub dirlist {
934: my $uri=shift;
935: $uri=~s/^\///;
936: $uri=~s/\/$//;
937: my ($res,$udom,$uname,@rest)=split(/\//,$uri);
938: if ($udom) {
939: if ($uname) {
940: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
941: homeserver($uname,$udom));
942: return split(/:/,$listing);
943: } else {
944: my $tryserver;
945: my %allusers=();
946: foreach $tryserver (keys %libserv) {
947: if ($hostdom{$tryserver} eq $udom) {
948: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
949: $tryserver);
950: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
951: && ($listing ne 'con_lost')) {
952: map {
953: my ($entry,@stat)=split(/&/,$_);
954: $allusers{$entry}=1;
955: } split(/:/,$listing);
956: }
957: }
958: }
959: my $alluserstr='';
960: map {
961: $alluserstr.=$_.'&user:';
962: } sort keys %allusers;
963: $alluserstr=~s/:$//;
964: return split(/:/,$alluserstr);
965: }
966: } else {
967: my $tryserver;
968: my %alldom=();
969: foreach $tryserver (keys %libserv) {
970: $alldom{$hostdom{$tryserver}}=1;
971: }
972: my $alldomstr='';
973: map {
974: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
975: } sort keys %alldom;
976: $alldomstr=~s/:$//;
977: return split(/:/,$alldomstr);
978: }
979: }
980:
981: # -------------------------------------------------------- Value of a Condition
982:
983: sub directcondval {
984: my $number=shift;
985: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
986: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
987: } else {
988: return 2;
989: }
990: }
991:
992: sub condval {
993: my $condidx=shift;
994: my $result=0;
995: if ($ENV{'request.course.id'}) {
996: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx})) {
997: my $operand='|';
998: my @stack;
999: map {
1000: if ($_ eq '(') {
1001: push @stack,($operand,$result)
1002: } elsif ($_ eq ')') {
1003: my $before=pop @stack;
1004: if (pop @stack eq '&') {
1005: $result=$result>$before?$before:$result;
1006: } else {
1007: $result=$result>$before?$result:$before;
1008: }
1009: } elsif (($_ eq '&') || ($_ eq '|')) {
1010: $operand=$_;
1011: } else {
1012: my $new=directcondval($_);
1013: if ($operand eq '&') {
1014: $result=$result>$new?$new:$result;
1015: } else {
1016: $result=$result>$new?$result:$new;
1017: }
1018: }
1019: } ($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx}=~
1020: /(\d+|\(|\)|\&|\|)/g);
1021: }
1022: }
1023: return $result;
1024: }
1025:
1026: # --------------------------------------------------------- Value of a Variable
1027:
1028: sub varval {
1029: my $varname=shift;
1030: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
1031: my $rest;
1032: if ($therest[0]) {
1033: $rest=join('.',@therest);
1034: } else {
1035: $rest='';
1036: }
1037: if ($realm eq 'user') {
1038: # --------------------------------------------------------------- user.resource
1039: if ($space eq 'resource') {
1040: # ----------------------------------------------------------------- user.access
1041: } elsif ($space eq 'access') {
1042: return &allowed($qualifier,$rest);
1043: # ------------------------------------------ user.preferences, user.environment
1044: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
1045: return $ENV{join('.',('environment',$qualifier,$rest))};
1046: # ----------------------------------------------------------------- user.course
1047: } elsif ($space eq 'course') {
1048: return $ENV{join('.',('request.course',$qualifier))};
1049: # ------------------------------------------------------------------- user.role
1050: } elsif ($space eq 'role') {
1051: my ($role,$where)=split(/\./,$ENV{'request.role'});
1052: if ($qualifier eq 'value') {
1053: return $role;
1054: } elsif ($qualifier eq 'extent') {
1055: return $where;
1056: }
1057: # ----------------------------------------------------------------- user.domain
1058: } elsif ($space eq 'domain') {
1059: return $ENV{'user.domain'};
1060: # ------------------------------------------------------------------- user.name
1061: } elsif ($space eq 'name') {
1062: return $ENV{'user.name'};
1063: # ---------------------------------------------------- Any other user namespace
1064: } else {
1065: my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
1066: my %reply=&get($space,$item);
1067: return $reply{$item};
1068: }
1069: } elsif ($realm eq 'request') {
1070: # ------------------------------------------------------------- request.browser
1071: if ($space eq 'browser') {
1072: return $ENV{'browser.'.$qualifier};
1073: } elsif ($space eq 'filename') {
1074: return $ENV{'request.filename'};
1075: }
1076: } elsif ($realm eq 'course') {
1077: # ---------------------------------------------------------- course.description
1078: if ($space eq 'description') {
1079: return &coursedescription($ENV{'request.course.id'});
1080: # ------------------------------------------------------------------- course.id
1081: } elsif ($space eq 'id') {
1082: return $ENV{'request.course.id'};
1083: # -------------------------------------------------- Any other course namespace
1084: } else {
1085: my ($cdom,$cnam)=split(/\_/,$ENV{'request.course.id'});
1086: my $chome=&homeserver($cnam,$cdom);
1087: my $item=join('.',($qualifier,$rest));
1088: return &unescape
1089: (&reply('get:'.$cdom.':'.$cnam.':'.&escape($space).':'.
1090: &escape($item),$chome));
1091: }
1092: } elsif ($realm eq 'userdata') {
1093: my $uhome=&homeserver($qualifier,$space);
1094: # ----------------------------------------------- userdata.domain.name.resource
1095: # ---------------------------------------------------- Any other user namespace
1096: } elsif ($realm eq 'environment') {
1097: # ----------------------------------------------------------------- environment
1098: return $ENV{join('.',($space,$qualifier,$rest))};
1099: } elsif ($realm eq 'system') {
1100: # ----------------------------------------------------------------- system.time
1101: if ($space eq 'time') {
1102: return time;
1103: }
1104: }
1105: return '';
1106: }
1107:
1108: # ------------------------------------------------- Update symbolic store links
1109:
1110: sub symblist {
1111: my ($mapname,%newhash)=@_;
1112: $mapname=declutter($mapname);
1113: my %hash;
1114: if (($ENV{'request.course.fn'}) && (%newhash)) {
1115: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1116: &GDBM_WRCREAT,0640)) {
1117: map {
1118: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
1119: } keys %newhash;
1120: if (untie(%hash)) {
1121: return 'ok';
1122: }
1123: }
1124: }
1125: return 'error';
1126: }
1127:
1128: # ------------------------------------------------------ Return symb list entry
1129:
1130: sub symbread {
1131: my $thisfn=shift;
1132: unless ($thisfn) {
1133: $thisfn=$ENV{'request.filename'};
1134: }
1135: $thisfn=declutter($thisfn);
1136: my %hash;
1137: my %bighash;
1138: my $syval='';
1139: if (($ENV{'request.course.fn'}) && ($thisfn)) {
1140: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1141: &GDBM_READER,0640)) {
1142: $syval=$hash{$thisfn};
1143: untie(%hash);
1144: }
1145: # ---------------------------------------------------------- There was an entry
1146: if ($syval) {
1147: unless ($syval=~/\_\d+$/) {
1148: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
1149: &appenv('request.ambiguous' => $thisfn);
1150: return '';
1151: }
1152: $syval.=$1;
1153: }
1154: } else {
1155: # ------------------------------------------------------- Was not in symb table
1156: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1157: &GDBM_READER,0640)) {
1158: # ---------------------------------------------- Get ID(s) for current resource
1159: my $ids=$bighash{'ids_/res/'.$thisfn};
1160: if ($ids) {
1161: # ------------------------------------------------------------------- Has ID(s)
1162: my @possibilities=split(/\,/,$ids);
1163: if ($#possibilities==0) {
1164: # ----------------------------------------------- There is only one possibility
1165: my ($mapid,$resid)=split(/\./,$ids);
1166: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
1167: } else {
1168: # ------------------------------------------ There is more than one possibility
1169: my $realpossible=0;
1170: map {
1171: my $file=$bighash{'src_'.$_};
1172: if (&allowed('bre',$file)) {
1173: my ($mapid,$resid)=split(/\./,$_);
1174: if ($bighash{'map_type_'.$mapid} ne 'page') {
1175: $realpossible++;
1176: $syval=declutter($bighash{'map_id_'.$mapid}).
1177: '___'.$resid;
1178: }
1179: }
1180: } @possibilities;
1181: if ($realpossible!=1) { $syval=''; }
1182: }
1183: }
1184: untie(%bighash)
1185: }
1186: }
1187: if ($syval) { return $syval.'___'.$thisfn; }
1188: }
1189: &appenv('request.ambiguous' => $thisfn);
1190: return '';
1191: }
1192:
1193: # ---------------------------------------------------------- Return random seed
1194:
1195: sub numval {
1196: my $txt=shift;
1197: $txt=~tr/A-J/0-9/;
1198: $txt=~tr/a-j/0-9/;
1199: $txt=~tr/K-T/0-9/;
1200: $txt=~tr/k-t/0-9/;
1201: $txt=~tr/U-Z/0-5/;
1202: $txt=~tr/u-z/0-5/;
1203: $txt=~s/\D//g;
1204: return int($txt);
1205: }
1206:
1207: sub rndseed {
1208: my $symb;
1209: unless ($symb=&symbread()) { return time; }
1210: my $symbchck=unpack("%32C*",$symb);
1211: my $symbseed=numval($symb)%$symbchck;
1212: my $namechck=unpack("%32C*",$ENV{'user.name'});
1213: my $nameseed=numval($ENV{'user.name'})%$namechck;
1214: return int( $symbseed
1215: .$nameseed
1216: .unpack("%32C*",$ENV{'user.domain'})
1217: .unpack("%32C*",$ENV{'request.course.id'})
1218: .$namechck
1219: .$symbchck);
1220: }
1221:
1222: # ------------------------------------------------------------ Serves up a file
1223: # returns either the contents of the file or a -1
1224: sub getfile {
1225: my $file=shift;
1226: &repcopy($file);
1227: if (! -e $file ) { return -1; };
1228: my $fh=Apache::File->new($file);
1229: my $a='';
1230: while (<$fh>) { $a .=$_; }
1231: return $a
1232: }
1233:
1234: sub filelocation {
1235: my ($dir,$file) = @_;
1236: my $location;
1237: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
1238: $file=~s/^$perlvar{'lonDocRoot'}//;
1239: $file=~s:^/*res::;
1240: if ( !( $file =~ m:^/:) ) {
1241: $location = $dir. '/'.$file;
1242: } else {
1243: $location = '/home/httpd/html/res'.$file;
1244: }
1245: $location=~s://+:/:g; # remove duplicate /
1246: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
1247: return $location;
1248: }
1249:
1250: sub hreflocation {
1251: my ($dir,$file)=@_;
1252: unless (($_=~/^http:\/\//i) || ($_=~/^\//)) {
1253: my $finalpath=filelocation($dir,$file);
1254: $finalpath=~s/^\/home\/httpd\/html//;
1255: return $finalpath;
1256: } else {
1257: return $file;
1258: }
1259: }
1260:
1261: # ------------------------------------------------------------- Declutters URLs
1262:
1263: sub declutter {
1264: my $thisfn=shift;
1265: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
1266: $thisfn=~s/^\///;
1267: $thisfn=~s/^res\///;
1268: return $thisfn;
1269: }
1270:
1271: # -------------------------------------------------------- Escape Special Chars
1272:
1273: sub escape {
1274: my $str=shift;
1275: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
1276: return $str;
1277: }
1278:
1279: # ----------------------------------------------------- Un-Escape Special Chars
1280:
1281: sub unescape {
1282: my $str=shift;
1283: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1284: return $str;
1285: }
1286:
1287: # ================================================================ Main Program
1288:
1289: sub BEGIN {
1290: if ($readit ne 'done') {
1291: # ------------------------------------------------------------ Read access.conf
1292: {
1293: my $config=Apache::File->new("/etc/httpd/conf/access.conf");
1294:
1295: while (my $configline=<$config>) {
1296: if ($configline =~ /PerlSetVar/) {
1297: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
1298: chomp($varvalue);
1299: $perlvar{$varname}=$varvalue;
1300: }
1301: }
1302: }
1303:
1304: # ------------------------------------------------------------- Read hosts file
1305: {
1306: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
1307:
1308: while (my $configline=<$config>) {
1309: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
1310: $hostname{$id}=$name;
1311: $hostdom{$id}=$domain;
1312: if ($role eq 'library') { $libserv{$id}=$name; }
1313: }
1314: }
1315:
1316: # ------------------------------------------------------ Read spare server file
1317: {
1318: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
1319:
1320: while (my $configline=<$config>) {
1321: chomp($configline);
1322: if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
1323: $spareid{$configline}=1;
1324: }
1325: }
1326: }
1327: # ------------------------------------------------------------ Read permissions
1328: {
1329: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
1330:
1331: while (my $configline=<$config>) {
1332: chomp($configline);
1333: my ($role,$perm)=split(/ /,$configline);
1334: if ($perm ne '') { $pr{$role}=$perm; }
1335: }
1336: }
1337:
1338: # -------------------------------------------- Read plain texts for permissions
1339: {
1340: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
1341:
1342: while (my $configline=<$config>) {
1343: chomp($configline);
1344: my ($short,$plain)=split(/:/,$configline);
1345: if ($plain ne '') { $prp{$short}=$plain; }
1346: }
1347: }
1348:
1349: # ------------------------------------------------------------- Read file types
1350: {
1351: my $config=Apache::File->new("$perlvar{'lonTabDir'}/filetypes.tab");
1352:
1353: while (my $configline=<$config>) {
1354: chomp($configline);
1355: my ($ending,$emb,@descr)=split(/\s+/,$configline);
1356: if ($descr[0] ne '') {
1357: $fe{$ending}=$emb;
1358: $fd{$ending}=join(' ',@descr);
1359: }
1360: }
1361: }
1362:
1363:
1364: $readit='done';
1365: &logthis('<font color=yellow>INFO: Read configuration</font>');
1366: }
1367: }
1368: 1;
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