mdw@git.distorted.org.uk Git - userv-utils/blob - groupmanage/groupmanage

   1 #!/usr/bin/perl
   2 #
   3 # Copyright (C) 1995-9, 2003 Ian Jackson <ijackson@chiark.greenend.org.uk>
   4 # Copyright (C) 1999, 2003
   5 #   Chancellor Masters and Scholars of the University of Cambridge
   6 #
   7 # Improved by Ben Harris <bjh21@cam.ac.uk> in 1999 and 2003 for Unix
   8 # Support's own nefarious purposes.
   9 #
  10 # This is free software; you can redistribute it and/or modify it
  11 # under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2, or (at your option)
  13 # any later version.
  14 #
  15 # It is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # $Id$
  21
  22 sub usage {
  23     &unlock;
  24     &p_out;
  25     print(<<END) || die "groupmanage: write usage: $!\n";
  26 groupmanage: $_[0]
  27   usage:
  28     groupmanage <groupname> [--info]
  29     groupmanage <groupname> <action> [<action> ...]
  30     groupmanage <groupname> --create [<action> <action> ...]
  31   actions:
  32        --clear
  33        --add <username> <username> ...
  34        --remove <username> <username> ...
  35        --manager-clear
  36        --manager-add <username> <username> ...
  37        --manager-remove <username> <username> ...
  38        --title <string>
  39        --owner <username>  [root only]
  40 groupmanage is Copyright.  It is free software, released under the GNU
  41 GPL v2 or later.  There is NO WARRANTY.  See the GPL for details.
  42 END
  43     exit(1);
  44 }
  45
  46 @ARGV || &usage('too few arguments');
  47
  48 if ($>) {
  49     exec 'userv','root','groupmanage',@ARGV;
  50     &quit("unable to execute userv to gain root privilege: $!");
  51 }
  52
  53 chdir("/etc") || die "groupmanage: chdir /etc: $!\n";
  54
  55 $groupname= shift(@ARGV);
  56 $groupname =~ y/\n//d;
  57
  58 $groupname =~ m/^\w[-0-9A-Za-z]*$/ ||
  59     &quit("first argument is invalid - must be group name");
  60
  61 @ARGV || push(@ARGV,'--info');
  62
  63 $callinguser= exists $ENV{'USERV_UID'} ? $ENV{'USERV_UID'} : $<;
  64
  65 %opt= ('user-create','0',
  66        'user-create-minunameu','5',
  67        'user-create-min','10000',
  68        'user-create-max','19999',
  69        'user-create-nameintitle','0',
  70        'user-create-maxperu','5',
  71        'group-file','group',
  72        'gtmp-file','gtmp',
  73        'grouplist-file','grouplist',
  74        'name-regexp','',
  75        'name-maxlen','8',
  76        'admin-group','',
  77        'finish-command','');
  78 %ovalid=  ('user-create','boolean',
  79            'user-create-minunameu','number',
  80            'user-create-min','number',
  81            'user-create-max','number',
  82            'user-create-nameintitle','boolean',
  83            'user-create-maxperu','number',
  84            'group-file','string',
  85            'gtmp-file','string',
  86            'grouplist-file','string',
  87            'name-regexp','string',
  88            'name-maxlen','number',
  89            'admin-group','string',
  90            'finish-command','string');
  91
  92 sub ov_boolean {
  93     $cov= $_ eq 'yes' ? 1 :
  94           $_ eq 'no' ? 0 :
  95           &quit("groupmanage.conf:$.: bad boolean value");
  96 }
  97
  98 sub ov_number {
  99     m/^[0-9]{1,10}$/ || &quit("groupmanage.conf:$.: bad numerical value");
 100 }
 101
 102 sub ov_string {
 103
 104 }
 105
 106 open(GMC,"groupmanage.conf") || &quit("read groupmanage.conf: $!");
 107 while (<GMC>) {
 108     next if m/^\#/ || !m/\S/;
 109     s/\s*\n$//;
 110     s/^\s*([-0-9a-z]+)\s*// || &quit("groupmanage.conf:$.: bad option format");
 111     $co= $1;
 112     defined($opt{$co}) || &quit("groupmanage.conf:$.: unknown option $co");
 113     $cov= $_;
 114     $ovf= 'ov_'.$ovalid{$co};
 115     &$ovf;
 116     $opt{$co}= $cov;
 117 }
 118 close(GMC);
 119
 120 if ($ARGV[0] eq '--info') {
 121     @ARGV == 1 || &usage('no arguments allowed after --info');
 122     &p_out;
 123     &load;
 124     &checkexists;
 125     &display;
 126     &p_out;
 127     exit(0);
 128 }
 129
 130 sub naming {
 131     $callinguser || return;
 132     &p_out;
 133     if ($opt{'user-create-minunameu'}) {
 134         print(STDERR <<END) || &quit("write err re name: $!");
 135 groupmanage: groups you create must be named after you ...
 136     <usernamepart>-<identifier>
 137  You must quote at least $opt{'user-create-minunameu'} chars of your username $createby
 138  (or all of it if it is shorter).
 139 END
 140     }
 141     if ($opt{'name-regexp'}) {
 142         print(STDERR <<END) || &quit("write err re name: $!");
 143 groupmanage: groups you create must match a pattern...
 144   The pattern is the Perl regular expression /$opt{'name-regexp'}/.
 145 END
 146     }
 147     exit(1);
 148 }
 149
 150 if ($ARGV[0] eq '--create') {
 151     $opt{'user-create'} || !$callinguser ||
 152         &quit("group creation by users disabled by administrator");
 153     length($groupname) <= $opt{'name-maxlen'} ||
 154         &quit("group names must be $opt{'name-maxlen'} chars or fewer");
 155     $!=0; (@pw= getpwuid($callinguser))
 156         || &quit("cannot get your passwd entry: $!");
 157     $createby= $pw[0];
 158     if ($opt{'user-create-minunameu'}) {
 159         $groupname =~ m/^([-0-9A-Za-z]+)-([0-9a-z]+)$/ || &naming;
 160         $upart= $1;
 161         $idpart= $2;
 162         $upart eq $createby ||
 163             (length($upart) >= $opt{'user-create-minunameu'} &&
 164              substr($createby,0,length($upart)) eq $upart)
 165                 || &naming;
 166     } else {
 167         $groupname =~ m/${opt{'name-regexp'}}/ || &naming;
 168     }
 169     $create= 1;
 170     shift(@ARGV);
 171 }
 172
 173 &lock;
 174 &load;
 175
 176 if ($create) {
 177     $bythisowner < $opt{'user-create-maxperu'} ||
 178         &quit("you already have $bythisowner group(s)");
 179     $groupfileix==-1 || &quit("group already exists, cannot create it");
 180     $grouplistix==-1 || &quit("group is already in grouplist, cannot create it");
 181     for ($gid= $opt{'user-create-min'};
 182          $gid < $opt{'user-create-max'} && defined(getgrgid($gid));
 183          $gid++) { }
 184     $gid <= $opt{'user-create-max'} || &quit("out of gids to use, contact admin");
 185     $password=''; @members=($createby);
 186     $description= "${createby}'s -- user-defined, no title";
 187     $owner= $createby; @managers=(); @members= ($createby);
 188     $groupfileix=$#groupfile+1;
 189     $grouplistix=$#grouplist+1;
 190     &p("created group $groupname");
 191 } else {
 192     &checkexists;
 193     &p("modifying group $groupname");
 194 }
 195
 196 &weare($owner) || grep(&weare($_),@managers) || !$callinguser ||
 197     &quit("you may not manage $groupname");
 198
 199 $action= 'none';
 200 while (@ARGV) {
 201     $_= shift(@ARGV);
 202     if (m/^--(add|remove)$/) {
 203         $action= $1; $clist= 'members'; $what= 'member';
 204     } elsif (m/^--owner$/) {
 205         !$callinguser || &quit("only root may change owner");
 206         @ARGV || &usage("no username owner after --owner");
 207         $owner= shift(@ARGV);
 208         &p("owner set to $owner");
 209     } elsif (m/^--manager-(add|remove)$/) {
 210         $action= $1; $clist= 'managers'; $what= 'manager';
 211     } elsif (m/^--clear$/) {
 212         &p('cleared list of members');
 213         @members=(); $action='none'; $memc++;
 214     } elsif (m/^--manager-clear$/) {
 215         &p('cleared list of managers');
 216         @managers=(); $action='none';
 217     } elsif (m/^--title$/) {
 218         &weare($owner) || !$callinguser ||
 219             &quit("only group's owner ($owner) may change title");
 220         @ARGV || &usage("no title after --title");
 221         $_= shift(@ARGV); y/\020-\176//cd; y/:\\//d;
 222         if ($opt{'user-create-nameintitle'} &&
 223             $gid >= $opt{'user-create-min'} && $gid <= $opt{'user-create-max'}) {
 224             $_= "${owner}'s -- $_";
 225         }
 226         $description= $_;
 227         &p("title set to $description");
 228     } elsif (m/^-/) {
 229         &usage("unknown option $_");
 230     } elsif (m/^\w[-0-9A-Za-z]*$/) {
 231         y/\n//d;
 232         $chgu=$_;
 233         defined(getpwnam($chgu)) || &quit("username $chgu does not exist");
 234         eval "\@l = \@$clist; 1" || &quit("internal error: $@");
 235         $already= grep($_ eq $chgu, @l);
 236         if ($action eq 'add') {
 237             if ($already) {
 238                 &p("$chgu already $what");
 239             } else {
 240                 &p("added $what $chgu");
 241                 push(@l,$chgu);
 242                 $memc+= ($clist eq 'members');
 243             }
 244         } elsif ($action eq 'remove') {
 245             if ($already) {
 246                 &p("removed $what $chgu");
 247                 @l= grep($_ ne $chgu, @l);
 248                 $memc+= ($clist eq 'members');
 249             } else {
 250                 &p("$chgu is already not $what");
 251             }
 252         } else {
 253             &usage("username found but no action to take for them");
 254         }
 255         eval "\@$clist = \@l; 1" || &quit("internal error: $@");
 256     } else {
 257         &usage("bad username or option $_");
 258     }
 259 }
 260 &p("nb: a change to group membership only takes effect at the user's next login")
 261     if $memc;
 262 $groupfile[$groupfileix]=
 263     "$groupname:$password:$gid:".join(',',@members)."\n";
 264 $grouplist[$grouplistix]=
 265     "$groupname:$description:$owner:".join(',',@managers).":$homedir\n";
 266 &save($opt{'group-file'},@groupfile);
 267 &save($opt{'grouplist-file'},@grouplist);
 268 if ($opt{'finish-command'}) {
 269     !system($opt{'finish-command'}) || &quit("finish-command: $?");
 270 }
 271 unlink($opt{'gtmp-file'}) || &quit("unlock group (remove gtmp): $!");
 272 &p_out;
 273 exit(0);
 274
 275 sub load {
 276     open(GF,"< $opt{'group-file'}") || &quit("read group: $!");
 277     @groupfile=<GF>; close(GF);
 278     $groupfileix=-1;
 279     for ($i=0; $i<=$#groupfile; $i++) {
 280         $_= $groupfile[$i]; s/\n$//;
 281         next if m/^\#/;
 282         m/^(\w[-0-9A-Za-z]*):([^:]*):(\d+):([-0-9A-Za-z,]*)$/ ||
 283             &quit("bad entry in group: $_");
 284         $gname2gid{$1}=$3;
 285         next unless $1 eq $groupname;
 286         $groupfileix<0 || &quit("duplicate entries in group");
 287         $groupfileix= $i;
 288         $password= $2;
 289         $gid= $3;
 290         @members= split(/,/,$4);
 291     }
 292     open(GL,"< $opt{'grouplist-file'}") || &quit("read grouplist: $!");
 293     @grouplist=<GL>; close(GL);
 294     $grouplistix=-1;
 295     for ($i=0; $i<=$#grouplist; $i++) {
 296         $_= $grouplist[$i]; s/\n$//;
 297         next if m/^\#/;
 298         m/^(\w[-0-9A-Za-z]*):([^:]*):(\w[-0-9A-Za-z]*):([-0-9A-Za-z,]*):([^:]*)$/ ||
 299             &quit("bad entry in grouplist: $_");
 300         $bythisowner++ if ($create && $3 eq $createby &&
 301                            $gname2gid{$1} >= $opt{'user-create-min'} &&
 302                            $gname2gid{$1} <= $opt{'user-create-max'});
 303         next unless $1 eq $groupname;
 304         $grouplistix<0 || &quit("duplicate entries in grouplist");
 305         $grouplistix= $i;
 306         $description= $2;
 307         $owner= $3;
 308         $homedir= $5;
 309         @managers= split(/,/,$4);
 310     }
 311 }
 312
 313 sub checkexists {
 314     $grouplistix>=0 || &quit("no entry in grouplist for $groupname");
 315     $groupfileix>=0 || &quit("no entry in group for $groupname");
 316 }
 317
 318 sub weare {
 319     return 0 if $_[0] eq '';
 320     @pw= getpwnam($_[0]);
 321     return @pw && $pw[2] == $callinguser ? 1 : 0;
 322 }
 323
 324 sub save {
 325     $filename= shift(@_);
 326     unlink("$filename~");
 327     open(DUMP,"> $filename.new") || &quit("create new $filename: $!");
 328     print(DUMP @_) || &quit("write new $filename: $!");
 329     close(DUMP) || &quit("close new $filename: $!");
 330     link("$filename","$filename~") || &quit("create backup $filename: $!");
 331     rename("$filename.new","$filename") || &quit("install new $filename: $!");
 332 }
 333
 334 sub quit {
 335     &unlock;
 336     &p_out;
 337     die "groupmanage: @_\n";
 338 }
 339
 340 sub lock {
 341     link($opt{'group-file'},$opt{'gtmp-file'}) || &quit("create gtmp: $!");
 342     $locked++;
 343 }
 344
 345 sub unlock {
 346     return unless $locked;
 347     $locked--;
 348     unlink($opt{'gtmp-file'}) || warn("unlock group file (remove gtmp): $!\n");
 349 }
 350
 351 sub display {
 352     print(<<END) || &quit("write to stdout: $!\n");
 353 group       $groupname
 354 gid         $gid
 355 description $description
 356 owner       $owner
 357 managers    @managers
 358 members     @members
 359 homedir     $homedir
 360 END
 361 }
 362
 363 sub p_out {
 364     print(STDOUT "$stdout_string") || &quit("write to stdout: $!\n");
 365     $stdout_string= '';
 366 }
 367
 368 sub p {
 369     $stdout_string.= $_[0]."\n";
 370 }