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