Annotation of loncom/lcuseradd, revision 1.21
1.1 harris41 1: #!/usr/bin/perl
1.16 harris41 2:
3: # The Learning Online Network with CAPA
1.1 harris41 4: #
1.16 harris41 5: # lcuseradd - LON-CAPA setuid script to coordinate all actions
6: # with adding a user with filesystem privileges (e.g. author)
1.1 harris41 7: #
1.16 harris41 8: # YEAR=2000
9: # 10/27,10/29,10/30 Scott Harrison
1.15 harris41 10: # YEAR=2001
1.16 harris41 11: # 10/21,11/13,11/15 Scott Harrison
1.20 foxr 12: # YEAR=2002
13: # May 19, 2002 Ron Fox
14: # - Removed creation of the pulic_html directory. This directory
15: # can now be added in two ways:
16: # o The user can add it themselves if they want some local web
17: # space which may or may not contain construction items.
18: # o LonCapa will add it if/when the user is granted an Author
19: # role.
1.16 harris41 20: #
1.21 ! foxr 21: # $Id: lcuseradd,v 1.20 2002/04/27 13:10:47 foxr Exp $
1.16 harris41 22: ###
1.15 harris41 23:
24: ###############################################################################
25: ## ##
26: ## ORGANIZATION OF THIS PERL SCRIPT ##
27: ## ##
28: ## 1. Description of script ##
29: ## 2. Invoking script (standard input) ##
30: ## 3. Example usage inside another piece of code ##
31: ## 4. Description of functions ##
32: ## 5. Exit codes ##
33: ## 6. Initializations ##
34: ## 7. Make sure this process is running from user=www ##
35: ## 8. Start running script with www permissions ##
36: ## 9. Handle case of another lcpasswd process (locking) ##
37: ## 10. Error-check input, need 3 values (user name, password 1, password 2) ##
38: ## 11. Start running script with root permissions ##
39: ## 12. Add user and make www a member of the user-specific group ##
40: ## 13. Set password ##
41: ## 14. Make final modifications to the user directory ##
42: ## 15. Exit script (unlock) ##
43: ## ##
44: ###############################################################################
1.1 harris41 45:
46: use strict;
47:
1.15 harris41 48: # ------------------------------------------------------- Description of script
49: #
1.1 harris41 50: # This script is a setuid script that should
1.20 foxr 51: # be run by user 'www'. It creates a /home/USERNAME directory.
1.15 harris41 52: # It adds a user to the unix system.
1.2 harris41 53: # Passwords are set with lcpasswd.
54: # www becomes a member of this user group.
1.1 harris41 55:
1.15 harris41 56: # -------------- Invoking script (standard input versus command-line arguments)
57: #
58: # Standard input (STDIN) usage
1.1 harris41 59: # First line is USERNAME
60: # Second line is PASSWORD
1.3 harris41 61: # Third line is PASSWORD
1.15 harris41 62: #
63: # Command-line arguments [USERNAME] [PASSWORD] [PASSWORD]
64: # Yes, but be very careful here (don't pass shell commands)
65: # and this is only supported to allow perl-system calls.
66: #
1.7 harris41 67: # Valid passwords must consist of the
68: # ascii characters within the inclusive
69: # range of 0x20 (32) to 0x7E (126).
70: # These characters are:
71: # SPACE and
72: # !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO
73: # PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
1.15 harris41 74: #
1.7 harris41 75: # Valid user names must consist of ascii
76: # characters that are alphabetical characters
77: # (A-Z,a-z), numeric (0-9), or the underscore
78: # mark (_). (Essentially, the perl regex \w).
1.15 harris41 79: # User names must begin with an alphabetical character
80: # (A-Z,a-z).
1.7 harris41 81:
1.15 harris41 82: # ---------------------------------- Example usage inside another piece of code
1.4 harris41 83: # Usage within code
84: #
1.15 harris41 85: # $exitcode=
86: # system("/home/httpd/perl/lcuseradd","NAME","PASSWORD1","PASSWORD2")/256;
1.4 harris41 87: # print "uh-oh" if $exitcode;
88:
1.15 harris41 89: # ---------------------------------------------------- Description of functions
90: # enable_root_capability() : have setuid script run as root
91: # disable_root_capability() : have setuid script run as www
92: # try_to_lock() : make sure that another lcpasswd process isn't running
93:
94: # ------------------------------------------------------------------ Exit codes
1.4 harris41 95: # These are the exit codes.
1.13 harris41 96: # ( (0,"ok"),
97: # (1,"User ID mismatch. This program must be run as user 'www'"),
1.15 harris41 98: # (2,"Error. This program needs 3 command-line arguments (username, ".
99: # "password 1, password 2)."),
1.13 harris41 100: # (3,"Error. Three lines should be entered into standard input."),
1.15 harris41 101: # (4,"Error. Too many other simultaneous password change requests being ".
102: # "made."),
1.13 harris41 103: # (5,"Error. User $username does not exist."),
104: # (6,"Error. Could not make www a member of the group \"$safeusername\"."),
105: # (7,"Error. Root was not successfully enabled.),
1.15 harris41 106: # (8,"Error. Cannot set password."),
1.13 harris41 107: # (9,"Error. The user name specified has invalid characters."),
108: # (10,"Error. A password entry had an invalid character."),
109: # (11,"Error. User already exists.),
1.15 harris41 110: # (12,"Error. Something went wrong with the addition of user ".
111: # "\"$safeusername\"."),
1.13 harris41 112: # (13,"Error. Password mismatch."),
1.4 harris41 113:
1.15 harris41 114: # ------------------------------------------------------------- Initializations
1.1 harris41 115: # Security
1.15 harris41 116: $ENV{'PATH'}='/bin/:/usr/bin:/usr/local/sbin:/home/httpd/perl'; # Nullify path
117: # information
1.16 harris41 118: delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}; # nullify potential taints
1.2 harris41 119:
1.15 harris41 120: # Do not print error messages.
121: my $noprint=1;
122:
123: # ----------------------------- Make sure this process is running from user=www
124: my $wwwid=getpwnam('www');
125: &disable_root_capability;
126: if ($wwwid!=$>) {
127: print("User ID mismatch. This program must be run as user 'www'\n")
128: unless $noprint;
1.4 harris41 129: exit 1;
130: }
1.15 harris41 131:
132: # ----------------------------------- Start running script with www permissions
1.4 harris41 133: &disable_root_capability;
134:
1.15 harris41 135: # --------------------------- Handle case of another lcpasswd process (locking)
1.4 harris41 136: unless (&try_to_lock("/tmp/lock_lcpasswd")) {
1.15 harris41 137: print "Error. Too many other simultaneous password change requests being ".
138: "made.\n" unless $noprint;
1.4 harris41 139: exit 4;
140: }
141:
1.15 harris41 142: # ------- Error-check input, need 3 values (user name, password 1, password 2).
1.4 harris41 143: my @input;
1.5 harris41 144: if (@ARGV==3) {
1.4 harris41 145: @input=@ARGV;
146: }
147: elsif (@ARGV) {
1.15 harris41 148: print("Error. This program needs 3 command-line arguments (username, ".
149: "password 1, password 2).\n") unless $noprint;
1.4 harris41 150: unlink('/tmp/lock_lcpasswd');
151: exit 2;
152: }
153: else {
154: @input=<>;
1.5 harris41 155: if (@input!=3) {
1.15 harris41 156: print("Error. Three lines should be entered into standard input.\n")
157: unless $noprint;
1.4 harris41 158: unlink('/tmp/lock_lcpasswd');
159: exit 3;
160: }
1.19 harris41 161: foreach (@input) {chomp;}
1.4 harris41 162: }
163:
164: my ($username,$password1,$password2)=@input;
165: $username=~/^(\w+)$/;
166: my $safeusername=$1;
1.15 harris41 167: if (($username ne $safeusername) or ($safeusername!~/^[A-Za-z]/)) {
168: print "Error. The user name specified has invalid characters.\n"
169: unless $noprint;
1.8 harris41 170: unlink('/tmp/lock_lcpasswd');
171: exit 9;
172: }
173: my $pbad=0;
1.19 harris41 174: foreach (split(//,$password1)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
175: foreach (split(//,$password2)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}}
1.8 harris41 176: if ($pbad) {
177: print "Error. A password entry had an invalid character.\n";
178: unlink('/tmp/lock_lcpasswd');
179: exit 10;
180: }
1.5 harris41 181:
1.15 harris41 182: # -- Only add user if we can create a brand new home directory (/home/username)
1.7 harris41 183: if (-e "/home/$safeusername") {
184: print "Error. User already exists.\n" unless $noprint;
185: unlink('/tmp/lock_lcpasswd');
1.13 harris41 186: exit 11;
1.7 harris41 187: }
188:
1.15 harris41 189: # -- Only add user if the two password arguments match.
1.5 harris41 190: if ($password1 ne $password2) {
1.6 harris41 191: print "Error. Password mismatch.\n" unless $noprint;
1.5 harris41 192: unlink('/tmp/lock_lcpasswd');
1.13 harris41 193: exit 13;
1.5 harris41 194: }
1.4 harris41 195:
1.15 harris41 196: # ---------------------------------- Start running script with root permissions
1.4 harris41 197: &enable_root_capability;
198:
1.15 harris41 199: # ------------------- Add user and make www a member of the user-specific group
200: # -- Add user
1.5 harris41 201: if (system('/usr/sbin/useradd','-c','LON-CAPA user',$safeusername)) {
1.15 harris41 202: print "Error. Something went wrong with the addition of user ".
203: "\"$safeusername\".\n" unless $noprint;
1.4 harris41 204: unlink('/tmp/lock_lcpasswd');
1.13 harris41 205: exit 12;
1.4 harris41 206: }
1.7 harris41 207:
208: # Make www a member of that user group.
1.17 harris41 209: my $groups=`/usr/bin/groups www` or exit(6);
210: chomp $groups; $groups=~s/^\S+\s+\:\s+//;
211: my @grouplist=split(/\s+/,$groups);
212: my @ugrouplist=grep {!/www|$safeusername/} @grouplist;
213: my $gl=join(',',(@ugrouplist,$safeusername));
214: if (system('/usr/sbin/usermod','-G',$gl,'www')) {
1.15 harris41 215: print "Error. Could not make www a member of the group ".
216: "\"$safeusername\".\n" unless $noprint;
1.5 harris41 217: unlink('/tmp/lock_lcpasswd');
218: exit 6;
219: }
220:
1.15 harris41 221: # ---------------------------------------------------------------- Set password
222: # Set password with lcpasswd (which creates smbpasswd entry).
1.2 harris41 223:
1.15 harris41 224: unlink('/tmp/lock_lcpasswd');
225: &disable_root_capability;
1.16 harris41 226: ($>,$<)=($wwwid,$wwwid);
227: open OUT,"|/home/httpd/perl/lcpasswd";
1.15 harris41 228: print OUT $safeusername;
229: print OUT "\n";
230: print OUT $password1;
231: print OUT "\n";
232: print OUT $password1;
233: print OUT "\n";
234: close OUT;
235: if ($?) {
236: exit 8;
1.8 harris41 237: }
1.18 harris41 238: ($>,$<)=($wwwid,0);
1.15 harris41 239: &enable_root_capability;
1.8 harris41 240:
1.20 foxr 241: # -- Don't add public_html... that can be added either by the user
242: # or by lchtmldir when the user is granted an authorship role.
243:
1.15 harris41 244: # ------------------------------ Make final modifications to the user directory
245: # -- Add a public_html file with a stand-in index.html file
1.8 harris41 246:
1.21 ! foxr 247: system('/bin/chmod','-R','0660',"/home/$safeusername");
! 248: system('/bin/chmod','0710',"/home/$safeusername");
! 249: mkdir "/home/$safeusername/public_html",0755;
! 250: system('/bin/chmod','02770',"/home/$safeusername/public_html");
! 251: open OUT,">/home/$safeusername/public_html/index.html";
! 252: print OUT<<END;
! 253: <html>
! 254: <head>
! 255: <title>$safeusername</title>
! 256: </head>
! 257: <body>
! 258: <h1>$safeusername</h1>
! 259: <p>
! 260: Learning Online Network
! 261: </p>
! 262: <p>
! 263: This area provides for:
! 264: </p>
! 265: <ul>
! 266: <li>resource construction</li>
! 267: <li>resource publication</li>
! 268: <li>record-keeping</li>
! 269: </ul>
! 270: </body>
! 271: </html>
! 272: END
! 273: close OUT;
1.20 foxr 274:
1.11 harris41 275: system('/bin/chown','-R',"$safeusername:$safeusername","/home/$safeusername");
1.15 harris41 276:
277: # -------------------------------------------------------- Exit script
1.8 harris41 278: &disable_root_capability;
279: exit 0;
1.1 harris41 280:
1.15 harris41 281: # ---------------------------------------------- Have setuid script run as root
1.5 harris41 282: sub enable_root_capability {
283: if ($wwwid==$>) {
284: ($<,$>)=($>,$<);
285: ($(,$))=($),$();
286: }
287: else {
288: # root capability is already enabled
289: }
290: return $>;
291: }
292:
1.15 harris41 293: # ----------------------------------------------- Have setuid script run as www
1.5 harris41 294: sub disable_root_capability {
295: if ($wwwid==$<) {
296: ($<,$>)=($>,$<);
297: ($(,$))=($),$();
298: }
299: else {
300: # root capability is already disabled
301: }
302: }
303:
1.15 harris41 304: # ----------------------- Make sure that another lcpasswd process isn't running
1.5 harris41 305: sub try_to_lock {
306: my ($lockfile)=@_;
307: my $currentpid;
308: my $lastpid;
309: # Do not manipulate lock file as root
310: if ($>==0) {
311: return 0;
312: }
313: # Try to generate lock file.
314: # Wait 3 seconds. If same process id is in
315: # lock file, then assume lock file is stale, and
316: # go ahead. If process id's fluctuate, try
317: # for a maximum of 10 times.
318: for (0..10) {
319: if (-e $lockfile) {
320: open(LOCK,"<$lockfile");
321: $currentpid=<LOCK>;
322: close LOCK;
323: if ($currentpid==$lastpid) {
324: last;
325: }
326: sleep 3;
327: $lastpid=$currentpid;
328: }
329: else {
330: last;
331: }
332: if ($_==10) {
333: return 0;
334: }
335: }
336: open(LOCK,">$lockfile");
337: print LOCK $$;
338: close LOCK;
339: return 1;
340: }
1.16 harris41 341:
342: =head1 NAME
343:
344: lcuseradd - LON-CAPA setuid script to coordinate all actions
345: with adding a user with filesystem privileges (e.g. author)
346:
347: =head1 DESCRIPTION
348:
349: lcuseradd - LON-CAPA setuid script to coordinate all actions
350: with adding a user with filesystem privileges (e.g. author)
351:
352: =head1 README
353:
354: lcuseradd - LON-CAPA setuid script to coordinate all actions
355: with adding a user with filesystem privileges (e.g. author)
356:
357: =head1 PREREQUISITES
358:
359: =head1 COREQUISITES
360:
361: =pod OSNAMES
362:
363: linux
364:
365: =pod SCRIPT CATEGORIES
366:
367: LONCAPA/Administrative
368:
369: =cut
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