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Annotation of loncom/lcuserdel, revision 1.2

1.1       harris41    1: #!/usr/bin/perl
                      2: #
                      3: # lcuserdel
                      4: #
                      5: # Scott Harrison
                      6: # October 27, 2000
                      7: 
                      8: use strict;
                      9: 
1.2     ! harris41   10: # This script is a setuid script (chmod 6755) that should
1.1       harris41   11: # be run by user 'www'.  It DOES NOT delete directories.
                     12: # All it does is remove a user's entries from
                     13: # /etc/passwd, /etc/groups, and /etc/smbpasswd.
                     14: 
                     15: 
                     16: 
                     17: # Standard input usage
                     18: # First line is USERNAME
                     19: 
                     20: # Command-line arguments [USERNAME]
                     21: # Yes, but be very careful here (don't pass shell commands)
                     22: # and this is only supported to allow perl-system calls.
                     23: 
1.2     ! harris41   24: # Usage within code
        !            25: #
        !            26: # $exitcode=system("NAME")/256;
        !            27: # print "uh-oh" if $exitcode;
        !            28: 
        !            29: # These are the exit codes.
        !            30: 
1.1       harris41   31: # Security
                     32: $ENV{'PATH'}=""; # Nullify path information.
                     33: $ENV{'BASH_ENV'}=""; # Nullify shell environment information.
1.2     ! harris41   34: 
        !            35: # Do not print error messages if there are command-line arguments
        !            36: my $noprint=0;
        !            37: if (@ARGV) {
        !            38:     $noprint=1;
        !            39: }
        !            40: 
        !            41: open (IN, "</etc/passwd");
        !            42: my @lines=<IN>;
        !            43: close IN;
        !            44: my $wwwid;
        !            45: for my $l (@lines) {
        !            46:     chop $l;
        !            47:     my @F=split(/\:/,$l);
        !            48:     if ($F[0] eq 'www') {$wwwid=$F[2];}
        !            49: }
        !            50: if ($wwwid!=$<) {
        !            51:     print("User ID mismatch.  This program must be run as user 'www'\n") unless $noprint;
        !            52:     exit 1;
        !            53: }
        !            54: &disable_root_capability;
        !            55: 
        !            56: # Gather input.  Should only be 3 values.
        !            57: my @input;
        !            58: if (@ARGV==3) {
        !            59:     @input=@ARGV;
        !            60: }
        !            61: elsif (@ARGV) {
        !            62:     print("Error. This program needs 3 command-line arguments (username, old password, new password).\n") unless $noprint;
        !            63:     exit 2;
        !            64: }
        !            65: else {
        !            66:     @input=<>;
        !            67:     if (@input!=3) {
        !            68: 	print("Error. Three lines need to be entered into standard input.\n") unless $noprint;
        !            69: 	exit 3;
        !            70:     }
        !            71:     map {chop} @input;
        !            72: }
        !            73: # Handle case of another lcpasswd process
        !            74: unless (&try_to_lock("/tmp/lock_lcpasswd")) {
        !            75:     print "Error. Too many other simultaneous password change requests being made.\n" unless $noprint;
        !            76:     exit 4;
        !            77: }
        !            78: 
        !            79: 
1.1       harris41   80: