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

   1 #!/usr/bin/perl
   2 #
   3 # Reads /etc/grouplist, in form
   4 # group:description:owner:manager1,manager2,manager3:home-directory
   5 # (as many or few managers as you like)
   6 # Modifies /etc/grouplist by adding or removing managers &c,
   7 # and /etc/group by adding or removing members.
   8
   9 # Copyright (C)1995-8 Ian Jackson <ijackson@chiark.greenend.org.uk>
  10
  11 # This is free software; you can redistribute it and/or modify it
  12 # under the terms of the GNU General Public License as published by
  13 # the Free Software Foundation; either version 2, or (at your option)
  14 # any later version.
  15
  16 # It is distributed in the hope that it will be useful,
  17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 # GNU General Public License for more details.
  20
  21 sub usage {
  22     &unlock;
  23     &p_out;
  24     print(<<END) || die "groupmanage: write usage: $!\n";
  25 groupmanage: $_[0]
  26   usage:
  27     groupmanage <groupname> [--info]
  28     groupmanage <groupname> <action> [<action> ...]
  29     groupmanage <groupname> --create [<action> <action> ...]
  30   actions:
  31        --clear
  32        --add <username> <username> ...
  33        --remove <username> <username> ...
  34        --manager-clear
  35        --manager-add <username> <username> ...
  36        --manager-remove <username> <username> ...
  37        --title <string>
  38        --owner <username>  [root only]
  39 END
  40     exit(1);
  41 }
  42
  43 @ARGV || &usage('too few arguments');
  44
  45 if ($>) {
  46     exec 'userv','root','groupmanage',@ARGV;
  47     &quit("unable to execute userv to gain root privilege: $!");
  48 }
  49
  50 chdir("/etc") || die "groupmanage: chdir /etc: $!\n";
  51
  52 $groupname= shift(@ARGV);
  53 $groupname =~ y/\n//d;
  54
  55 $groupname =~ m/^\w[-0-9A-Za-z]*$/ ||
  56     &quit("first argument is invalid - must be group name");
  57
  58 @ARGV || push(@ARGV,'--info');
  59
  60 if ($ARGV[0] eq '--info') {
  61     @ARGV == 1 || &usage('no arguments allowed after --info');
  62     &p_out;
  63     &load;
  64     &checkexists;
  65     &display;
  66     &p_out;
  67     exit(0);
  68 }
  69
  70 $callinguser= exists $ENV{'USERV_UID'} ? $ENV{'USERV_UID'} : $<;
  71
  72 %opt= ('user-create','0',
  73        'user-create-minunameu','5',
  74        'user-create-min','10000',
  75        'user-create-max','19999',
  76        'user-create-nameintitle','0',
  77        'user-create-maxperu','5');
  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
  85 sub ov_boolean {
  86     $cov= $_ eq 'yes' ? 1 :
  87           $_ eq 'no' ? 0 :
  88           &quit("groupmanage.conf:$.: bad boolean value");
  89 }
  90
  91 sub ov_number {
  92     m/^[0-9]{1,10}$/ || &quit("groupmanage.conf:$.: bad numerical value");
  93 }
  94
  95 open(GMC,"groupmanage.conf") || &quit("read groupmanage.conf: $!");
  96 while (<GMC>) {
  97     next if m/^\#/ || !m/\S/;
  98     s/\s*\n$//;
  99     s/^\s*([-0-9a-z]+)\s*// || &quit("groupmanage.conf:$.: bad option format");
 100     $co= $1;
 101     defined($opt{$co}) || &quit("groupmanage.conf:$.: unknown option $co");
 102     $cov= $_;
 103     $ovf= 'ov_'.$ovalid{$co};
 104     &$ovf;
 105     $opt{$co}= $cov;
 106 }
 107 close(GMC);
 108
 109 sub naming {
 110     $callinguser || return;
 111     &p_out;
 112     print(STDERR <<END) || &quit("write err re name: $!");
 113 groupmanage: groups you create must be named after you ...
 114     <usernamepart>-<identifier>
 115  You must quote at least $opt{'user-create-minunameu'} chars of your username $createby
 116  (or all of it if it is shorter).
 117 END
 118     exit(1);
 119 }
 120
 121 if ($ARGV[0] eq '--create') {
 122     $opt{'user-create'} || !$callinguser ||
 123         &quit("group creation by users disabled by administrator");
 124     length($groupname) <= 8 || &quit("group names must be 8 chars or fewer");
 125     $groupname =~ m/^([-0-9A-Za-z]+)-([0-9a-z]+)$/ || &naming;
 126     $upart= $1;
 127     $idpart= $2;
 128     $!=0; (@pw= getpwuid($callinguser))
 129         || &quit("cannot get your passwd entry: $!");
 130     $createby= $pw[0];
 131     $upart eq $createby ||
 132         (length($upart) >= $opt{'user-create-minunameu'} &&
 133          substr($createby,0,length($upart)) eq $upart)
 134             || &naming;
 135     $create= 1;
 136     shift(@ARGV);
 137 }
 138
 139 &lock;
 140 &load;
 141
 142 if ($create) {
 143     $bythisowner < $opt{'user-create-maxperu'} ||
 144         &quit("you already have $bythisowner group(s)");
 145     $groupfileix==-1 || &quit("group already exists, cannot create it");
 146     $grouplistix==-1 || &quit("group is already in grouplist, cannot create it");
 147     for ($gid= $opt{'user-create-min'};
 148          $gid < $opt{'user-create-max'} && defined(getgrgid($gid));
 149          $gid++) { }
 150     $gid <= $opt{'user-create-max'} || &quit("out of gids to use, contact admin");
 151     $password=''; @members=($createby);
 152     $description= "${createby}'s -- user-defined, no title";
 153     $owner= $createby; @managers=(); @members= ($createby);
 154     $groupfileix=$#groupfile+1;
 155     $grouplistix=$#grouplist+1;
 156     &p("created group $groupname");
 157 } else {
 158     &checkexists;
 159     &p("modifying group $groupname");
 160 }
 161
 162 &weare($owner) || grep(&weare($_),@managers) || !$callinguser ||
 163     &quit("you may not manage $groupname");
 164
 165 $action= 'none';
 166 while (@ARGV) {
 167     $_= shift(@ARGV);
 168     if (m/^--(add|remove)$/) {
 169         $action= $1; $clist= 'members'; $what= 'member';
 170     } elsif (m/^--owner$/) {
 171         !$callinguser || &quit("only root may change owner");
 172         @ARGV || &usage("no username owner after --owner");
 173         $owner= shift(@ARGV);
 174         &p("owner set to $owner");
 175     } elsif (m/^--manager-(add|remove)$/) {
 176         $action= $1; $clist= 'managers'; $what= 'manager';
 177     } elsif (m/^--clear$/) {
 178         &p('cleared list of members');
 179         @members=(); $action='none'; $memc++;
 180     } elsif (m/^--manager-clear$/) {
 181         &p('cleared list of managers');
 182         @managers=(); $action='none';
 183     } elsif (m/^--title$/) {
 184         &weare($owner) || !$callinguser ||
 185             &quit("only group's owner ($owner) may change title");
 186         @ARGV || &usage("no title after --title");
 187         $_= shift(@ARGV); y/\020-\176//cd; y/:\\//d;
 188         if ($opt{'user-create-nameintitle'} &&
 189             $gid >= $opt{'user-create-min'} && $gid <= $opt{'user-create-max'}) {
 190             $_= "${owner}'s -- $_";
 191         }
 192         $description= $_;
 193         &p("title set to $description");
 194     } elsif (m/^-/) {
 195         &usage("unknown option $_");
 196     } elsif (m/^\w[-0-9A-Za-z]*$/) {
 197         y/\n//d;
 198         $chgu=$_;
 199         (@pw= getpwnam($chgu)) || &quit("username $chgu does not exist");
 200         eval "\@l = \@$clist; 1" || &quit("internal error: $@");
 201         $already= grep($_ eq $chgu, @l);
 202         if ($action eq 'add') {
 203             if ($already) {
 204                 &p("$chgu already $what");
 205             } else {
 206                 &p("added $what $chgu");
 207                 push(@l,$chgu);
 208                 $memc+= ($clist eq 'members');
 209             }
 210         } elsif ($action eq 'remove') {
 211             if ($already) {
 212                 &p("removed $what $chgu");
 213                 @l= grep($_ ne $chgu, @l);
 214                 $memc+= ($clist eq 'members');
 215             } else {
 216                 &p("$chgu is already not $what");
 217             }
 218         } else {
 219             &usage("username found but no action to take for them");
 220         }
 221         eval "\@$clist = \@l; 1" || &quit("internal error: $@");
 222     } else {
 223         &usage("bad username or option $_");
 224     }
 225 }
 226 &p("nb: a change to group membership only takes effect at the user's next login")
 227     if $memc;
 228 $groupfile[$groupfileix]=
 229     "$groupname:$password:$gid:".join(',',@members)."\n";
 230 $grouplist[$grouplistix]=
 231     "$groupname:$description:$owner:".join(',',@managers).":$homedir\n";
 232 &save('group',@groupfile);
 233 &save('grouplist',@grouplist);
 234 unlink('gtmp') || &quit("unlock group (remove gtmp): $!");
 235 &p_out;
 236 exit(0);
 237
 238 sub load {
 239     open(GF,"< group") || &quit("read group: $!");
 240     @groupfile=<GF>; close(GF);
 241     $groupfileix=-1;
 242     for ($i=0; $i<=$#groupfile; $i++) {
 243         $_= $groupfile[$i]; s/\n$//;
 244         next if m/^\#/;
 245         m/^(\w[-0-9A-Za-z]*):([^:]*):(\d+):([-0-9A-Za-z,]*)$/ ||
 246             &quit("bad entry in group: $_");
 247         $gname2gid{$1}=$3;
 248         next unless $1 eq $groupname;
 249         $groupfileix<0 || &quit("duplicate entries in group");
 250         $groupfileix= $i;
 251         $password= $2;
 252         $gid= $3;
 253         @members= split(/,/,$4);
 254     }
 255     open(GL,"< grouplist") || &quit("read grouplist: $!");
 256     @grouplist=<GL>; close(GL);
 257     $grouplistix=-1;
 258     for ($i=0; $i<=$#grouplist; $i++) {
 259         $_= $grouplist[$i]; s/\n$//;
 260         next if m/^\#/;
 261         m/^(\w[-0-9A-Za-z]*):([^:]*):(\w[-0-9A-Za-z]*):([-0-9A-Za-z,]*):([^:]*)$/ ||
 262             &quit("bad entry in grouplist: $_");
 263         $bythisowner++ if ($create && $3 eq $createby &&
 264                            $gname2gid{$1} >= $opt{'user-create-min'} &&
 265                            $gname2gid{$1} <= $opt{'user-create-max'});
 266         next unless $1 eq $groupname;
 267         $grouplistix<0 || &quit("duplicate entries in grouplist");
 268         $grouplistix= $i;
 269         $description= $2;
 270         $owner= $3;
 271         $homedir= $5;
 272         @managers= split(/,/,$4);
 273     }
 274 }
 275
 276 sub checkexists {
 277     $grouplistix>=0 || &quit("no entry in grouplist for $groupname");
 278     $groupfileix>=0 || &quit("no entry in group for $groupname");
 279 }
 280
 281 sub weare {
 282     return 0 if $_[0] eq '';
 283     @pw= getpwnam($_[0]);
 284     return @pw && $pw[2] == $callinguser ? 1 : 0;
 285 }
 286
 287 sub save {
 288     $filename= shift(@_);
 289     unlink("$filename~");
 290     open(DUMP,"> $filename.new") || &quit("create new $filename: $!");
 291     print(DUMP @_) || &quit("write new $filename: $!");
 292     close(DUMP) || &quit("close new $filename: $!");
 293     link("$filename","$filename~") || &quit("create backup $filename: $!");
 294     rename("$filename.new","$filename") || &quit("install new $filename: $!");
 295 }
 296
 297 sub quit {
 298     &unlock;
 299     &p_out;
 300     die "groupmanage: @_\n";
 301 }
 302
 303 sub lock {
 304     link('group','gtmp') || &quit("create gtmp: $!");
 305     $locked++;
 306 }
 307
 308 sub unlock {
 309     return unless $locked;
 310     $locked--;
 311     unlink('gtmp') || warn("unlock group file (remove gtmp): $!\n");
 312 }
 313
 314 sub display {
 315     print(<<END) || &quit("write to stdout: $!\n");
 316 group       $groupname
 317 gid         $gid
 318 description $description
 319 owner       $owner
 320 managers    @managers
 321 members     @members
 322 homedir     $homedir
 323 END
 324 }
 325
 326 sub p_out {
 327     print(STDOUT "$stdout_string") || &quit("write to stdout: $!\n");
 328     $stdout_string= '';
 329 }
 330
 331 sub p {
 332     $stdout_string.= $_[0]."\n";
 333 }