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Diff for /loncom/lcpasswd between versions 1.2 and 1.10

version 1.2, 2000/10/27 22:02:23 version 1.10, 2000/10/30 03:08:28
Line 1 Line 1
 #!/usr/bin/perl  #!/usr/bin/perl
   #
   # lcpasswd
   #
   # Scott Harrison
   # SH: October 27, 2000
   # SH: October 28, 2000
   
 use strict;  use strict;
   
 # Scott Harrison  
 # October 27, 2000  
   
 # This script is a setuid script that should  # This script is a setuid script that should
 # be run by user 'www'.  # be run by user 'www'.  This script allows
   # for synchronous entry of passwords into
   # both the /etc/passwd and the /etc/smbpasswd
   # files.
   
   # This script works under the same process control mechanism
   # as lcuseradd and lcpasswd, to make sure that only one of these
   # processes is running at any one time on the system.
   
 # Standard input usage  # Standard input usage
 # First line is USERNAME  # First line is USERNAME
 # Second line is CURRENT PASSWORD  # Second line is CURRENT PASSWORD
 # Third line is NEW PASSWORD  # Third line is NEW PASSWORD
   
   # Valid passwords must consist of the
   # ascii characters within the inclusive
   # range of 0x20 (32) to 0x7E (126).
   # These characters are:
   # SPACE and
   # !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO
   # PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
   
   # Valid user names must consist of ascii
   # characters that are alphabetical characters
   # (A-Z,a-z), numeric (0-9), or the underscore
   # mark (_). (Essentially, the perl regex \w).
   
   # Command-line arguments
   # Yes, but be very careful here (don't pass shell commands)
   # and this is only supported to allow perl-system calls.
   
   # Usage within code
   # Note: NEVER run as system("/home/httpd/perl/lcpasswd NAME OLDPWD NEWPWD")
   #
   # $exitcode=system("/home/httpd/perl/lcpasswd","NAME","OLDPWD","NEWPWD")/256;
   # print "uh-oh" if $exitcode;
   
   # These are the exit codes.
   # ( (0,"ok"),
   #   (1,"User ID mismatch.  This program must be run as user 'www'"),
   #   (2,"Error. This program needs 3 command-line arguments (username, old password, new password)."),
   #   (3,"Error. Three lines need to be entered into standard input."),
   #   (4,"Error. Too many other simultaneous password change requests being made."),
   #   (5,"Error. User $username does not exist."),
   #   (6,"Error. Invalid entry of current password."),
   #   (7,"Error. Root was not successfully enabled."),
   #   (8,"Error. Cannot open /etc/passwd."),
   #   (9,"Error. The user name specified has invalid characters."),
   #   (10,"Error. A password entry had an invalid character.") )
   
 # Security  # Security
 $ENV{'PATH'}="/bin:/usr/bin"; # Nullify path information except for what smbpasswd needs  $ENV{'PATH'}='/bin:/usr/bin'; # Nullify path information except for what smbpasswd needs
 $ENV{'BASH_ENV'}=""; # Nullify shell environment information.  $ENV{'BASH_ENV'}=''; # Nullify shell environment information.
   
   # Do not print error messages if there are command-line arguments
   my $noprint=0;
   if (@ARGV) {
       $noprint=1;
   }
   
 open (IN, "</etc/passwd");  # Read in /etc/passwd, and make sure this process is running from user=www
   open (IN, '</etc/passwd');
 my @lines=<IN>;  my @lines=<IN>;
 close IN;  close IN;
 my $wwwid;  my $wwwid;
Line 27  for my $l (@lines) { Line 80  for my $l (@lines) {
     if ($F[0] eq 'www') {$wwwid=$F[2];}      if ($F[0] eq 'www') {$wwwid=$F[2];}
 }  }
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
     print("User ID mismatch.  This program must be run as user 'www'\n");      print("User ID mismatch.  This program must be run as user 'www'\n") unless $noprint;
     exit 0;      exit 1;
 }  }
 &disable_root_capability;  &disable_root_capability;
 if (@ARGV) {  
     print("Error. This program does not accept command-line arguments.\n");  
     exit 0;  
 }  
   
 # Gather input from standard input.  Should only be 3 lines.  
 my @input=<>;  
 if (@input!=3) {  
     print("Error. Three lines need to be entered into standard input.\n");  
     exit 0;  
 }  
   
 # Handle case of another lcpasswd process  # Handle case of another lcpasswd process
 unless (&try_to_lock("/tmp/lock_lcpasswd")) {  unless (&try_to_lock('/tmp/lock_lcpasswd')) {
     print "Error. Too many other simultaneous password change requests being made.\n";      print "Error. Too many other simultaneous password change requests being made.\n" unless $noprint;
     exit 0;      exit 4;
   }
   
   # Gather input.  Should only be 3 values.
   my @input;
   if (@ARGV==3) {
       @input=@ARGV;
   }
   elsif (@ARGV) {
       print("Error. This program needs 3 command-line arguments (username, old password, new password).\n") unless $noprint;
       unlink('/tmp/lock_lcpasswd');
       exit 2;
   }
   else {
       @input=<>;
       if (@input!=3) {
    print("Error. Three lines need to be entered into standard input.\n") unless $noprint;
    unlink('/tmp/lock_lcpasswd');
    exit 3;
       }
       map {chop} @input;
 }  }
   
 my ($username,$oldpwd,$newpwd)=map {chop; $_} @input;  my ($username,$oldpwd,$newpwd)=@input;
   $username=~/^(\w+)$/;
   my $safeusername=$1;
   if ($username ne $safeusername) {
       print "Error. The user name specified has invalid characters.\n";
       unlink('/tmp/lock_lcpasswd');
       exit 9;
   }
   my $pbad=0;
   map {if (($_<32)&&($_>126)){$pbad=1;}} (split(//,$oldpwd));
   map {if (($_<32)&&($_>126)){$pbad=1;}} (split(//,$newpwd));
   if ($pbad) {
       print "Error. A password entry had an invalid character.\n";
       unlink('/tmp/lock_lcpasswd');
       exit 10;
   }
   
 # Grab the line corresponding to username  # Grab the line corresponding to username
 my ($userid,$useroldcryptpwd);  my ($userid,$useroldcryptpwd);
Line 61  for my $l (@lines) { Line 138  for my $l (@lines) {
   
 # Verify existence of user  # Verify existence of user
 if (!defined($userid)) {  if (!defined($userid)) {
     print "Error. User $username does not exist.\n";      print "Error. User $username does not exist.\n" unless $noprint;
     exit 0;      unlink('/tmp/lock_lcpasswd');
       exit 5;
 }  }
   
 # Verify password entry  # Verify password entry
 if (crypt($oldpwd,$useroldcryptpwd) ne $useroldcryptpwd) {  if (crypt($oldpwd,$useroldcryptpwd) ne $useroldcryptpwd) {
     print "Error. Invalid entry of current password.\n";      print "Error. Invalid entry of current password.\n" unless $noprint;
     exit 0;      unlink('/tmp/lock_lcpasswd');
       exit 6;
 }  }
   
 # Construct new password entry (random salt)  # Construct new password entry (random salt)
 my $newcryptpwd=crypt($newpwd,(join '', ('.', '/', 0..9, 'A'..'Z', 'a'..'z')[rand 64, rand 64]));  my $newcryptpwd=crypt($newpwd,(join '', ('.', '/', 0..9, 'A'..'Z', 'a'..'z')[rand 64, rand 64]));
 $U[1]=$newcryptpwd;  $U[1]=$newcryptpwd;
 my $userline=join(":",@U);  my $userline=join(':',@U);
 my $rootid=&enable_root_capability;  my $rootid=&enable_root_capability;
 if ($rootid!=0) {  if ($rootid!=0) {
     print "Error.  Root was not successfully enabled.\n";      print "Error.  Root was not successfully enabled.\n" unless $noprint;
     exit 0;      unlink('/tmp/lock_lcpasswd');
       exit 7;
 }  }
 open PASSWORDFILE, ">/etc/passwd" or die("Cannot open /etc/passwd!");  open PASSWORDFILE, '>/etc/passwd' or (print("Error.  Cannot open /etc/passwd.\n") && unlink('/tmp/lock_lcpasswd') && exit(8));
 for my $l (@lines) {  for my $l (@lines) {
     @F=split(/\:/,$l);      @F=split(/\:/,$l);
     if ($F[0] eq $username) {print PASSWORDFILE "$userline\n";}      if ($F[0] eq $username) {print PASSWORDFILE "$userline\n";}
     else {print PASSWORDFILE "$l\n";}      else {print PASSWORDFILE "$l\n";}
 }  }
 close PASSWORDFILE;  close PASSWORDFILE;
 $username=~/^(\w+)$/;  
 my $safeusername=$1;  
 ($>,$<)=(0,0); # fool smbpasswd here to think this is not a setuid environment  ($>,$<)=(0,0); # fool smbpasswd here to think this is not a setuid environment
 unless (-e "/etc/smbpasswd") {  unless (-e '/etc/smbpasswd') {
     open (OUT,">/etc/smbpasswd"); close OUT;      open (OUT,'>/etc/smbpasswd'); close OUT;
 }  }
 my $smbexist=0;  my $smbexist=0;
 open (IN, "</etc/smbpasswd");  open (IN, '</etc/smbpasswd');
 my @lines=<IN>;  my @lines=<IN>;
 close IN;  close IN;
 for my $l (@lines) {  for my $l (@lines) {
Line 103  for my $l (@lines) { Line 182  for my $l (@lines) {
     if ($F[0] eq $username) {$smbexist=1;}      if ($F[0] eq $username) {$smbexist=1;}
 }  }
 unless ($smbexist) {  unless ($smbexist) {
     open(OUT,">>/etc/smbpasswd");      open(OUT,'>>/etc/smbpasswd');
     print OUT join(":",($safeusername,$userid,'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX','','/home/'.$safeusername,'/bin/bash')) . "\n";      print OUT join(':',($safeusername,$userid,'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX','','/home/'.$safeusername,'/bin/bash')) . "\n";
     close OUT;      close OUT;
 }  }
 open(OUT,"|/usr/bin/smbpasswd -s $safeusername>/dev/null");  open(OUT,"|/usr/bin/smbpasswd -s $safeusername>/dev/null");
Line 113  print OUT $newpwd; print OUT "\n"; Line 192  print OUT $newpwd; print OUT "\n";
 close OUT;  close OUT;
 $<=$wwwid; # unfool the program  $<=$wwwid; # unfool the program
 &disable_root_capability;  &disable_root_capability;
 unlink("/tmp/lock_lcpasswd");  unlink('/tmp/lock_lcpasswd');
   exit 0;
   
   # ----------------------------------------------------------- have setuid script run as root
 sub enable_root_capability {  sub enable_root_capability {
     if ($wwwid==$>) {      if ($wwwid==$>) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,$<);
Line 126  sub enable_root_capability { Line 207  sub enable_root_capability {
     return $>;      return $>;
 }  }
   
   # ----------------------------------------------------------- have setuid script run as www
 sub disable_root_capability {  sub disable_root_capability {
     if ($wwwid==$<) {      if ($wwwid==$<) {
  ($<,$>)=($>,$<);   ($<,$>)=($>,$<);
Line 136  sub disable_root_capability { Line 218  sub disable_root_capability {
     }      }
 }  }
   
   # ----------------------------------- make sure that another lcpasswd process isn't running
 sub try_to_lock {  sub try_to_lock {
     my ($lockfile)=@_;      my ($lockfile)=@_;
     my $currentpid;      my $currentpid;
     my $lastpid;      my $lastpid;
       # Do not manipulate lock file as root
       if ($>==0) {
    return 0;
       }
       # Try to generate lock file.
       # Wait 3 seconds.  If same process id is in
       # lock file, then assume lock file is stale, and
       # go ahead.  If process id's fluctuate, try
       # for a maximum of 10 times.
     for (0..10) {      for (0..10) {
  if (-e $lockfile) {   if (-e $lockfile) {
     open(LOCK,"<$lockfile");      open(LOCK,"<$lockfile");
Removed from v.1.2  
changed lines
  Added in v.1.10

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