editgroup.in 8.31 KB
Newer Older
1 2 3
#!/usr/bin/perl -wT
#
# Copyright (c) 2000-2007 University of Utah and the Flux Group.
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
23 24 25 26 27 28
#
use English;
use strict;
use Getopt::Std;
use XML::Simple;
use Data::Dumper;
29
use Cwd qw(realpath);
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

#
# Back-end script to edit group membership.
#
sub usage()
{
    print("Usage: editgroup [-v] <xmlfile>\n");
    exit(-1);
}
my $optlist = "dv";
my $debug   = 0;
my $verify  = 0;	# Check data and return status only. 

#
# Configure variables
#
my $TB		= "@prefix@";
my $TBOPS       = "@TBOPSEMAIL@";
my $TBAUDIT	= "@TBAUDITEMAIL@";

#
# Untaint the path
#
$ENV{'PATH'} = "$TB/bin:$TB/sbin:/bin:/usr/bin:/usr/bin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Turn off line buffering on output
#
$| = 1;

#
# Load the Testbed support stuff.
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;
use User;
use Group;

# Protos
sub fatal($);
sub UserError(;$);

#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
my %options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
if (defined($options{"v"})) {
    $verify = 1;
}
if (@ARGV != 1) {
    usage();
}
my $xmlfile  = shift(@ARGV);

#
# Map invoking user to object. 
# If invoked as "nobody" we are coming from the web interface and the
# current user context is "implied" (see tbauth.php3).
#
my $this_user;

if (getpwuid($UID) ne "nobody") {
    $this_user = User->ThisUser();

    if (! defined($this_user)) {
	fatal("You ($UID) do not exist!");
    }
    # You don't need admin privileges to edit group membership.
}
else {
    #
    # Check the filename when invoked from the web interface; must be a
    # file in /tmp.
    #
    if ($xmlfile =~ /^([-\w\.\/]+)$/) {
	$xmlfile = $1;
    }
    else {
	fatal("Bad data in pathname: $xmlfile");
    }

    # Use realpath to resolve any symlinks.
121
    my $translated = realpath($xmlfile);
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
    if ($translated =~ /^(\/tmp\/[-\w\.\/]+)$/) {
	$xmlfile = $1;
    }
    else {
	fatal("Bad data in translated pathname: $xmlfile");
    }

    # The web interface (and in the future the xmlrpc interface) sets this.
    $this_user = User->ImpliedUser();

    if (! defined($this_user)) {
	fatal("Cannot determine implied user!");
    }
}

#
# These are the fields that we allow to come in from the XMLfile.
#
my $SLOT_OPTIONAL	= 0x1;	# The field is not required.
my $SLOT_REQUIRED	= 0x2;  # The field is required and must be non-null.
my $SLOT_ADMINONLY	= 0x4;  # Only admins can set this field.
#
# XXX We should encode all of this in the DB so that we can generate the
# forms on the fly, as well as this checking code.
#
my %xmlfields =
    # XML Field Name        DB slot name         Flags             Default
149 150 151 152 153 154 155 156 157
    ("group"		=> ["gid_idx",		$SLOT_REQUIRED],

     # Trust args, either:
     #   (change|add)_xxx=permit or
     #   Uxxx$$trust=(user|local_root|group_root)
     # where xxx is the uid_idx of a user.
     "change_*"		=> ["change",		$SLOT_OPTIONAL],     
     "add_*"		=> ["add",		$SLOT_OPTIONAL],     
     "U*\\\$\\\$trust"	=> ["trust",		$SLOT_OPTIONAL]);
158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195

#
# Must wrap the parser in eval since it exits on error.
#
my $xmlparse = eval { XMLin($xmlfile,
			    VarAttr => 'name',
			    ContentKey => '-content',
			    SuppressEmpty => undef); };
fatal($@)
    if ($@);

#
# Process and dump the errors (formatted for the web interface).
# We should probably XML format the errors instead but not sure I want
# to go there yet.
#
my %errors = ();

#
# Make sure all the required arguments were provided.
#
my $key;
foreach $key (keys(%xmlfields)) {
    my (undef, $required, undef) = @{$xmlfields{$key}};

    $errors{$key} = "Required value not provided"
	if ($required & $SLOT_REQUIRED  &&
	    ! exists($xmlparse->{'attribute'}->{"$key"}));
}
UserError()
    if (keys(%errors));

#
# We build up an array of arguments to pass to Group->EditGroup() as we check
# the attributes.
#
my %editgroup_args = ();

196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
#
# Wildcard keys have one or more *'s in them like simple glob patterns.
# This allows multiple key instances for categories of attributes, and
# putting a "type signature" in the key for arg checking, as well.
#
# Wildcards are made into regex's by anchoring the ends and changing each * to
# a "word" (group of alphahumeric.)  A tail * means "the rest", allowing
# multiple words separated by underscores or dashes.
#
my $wordpat = '[a-zA-Z0-9]+';
my $tailpat = '[-\w]+';
my %wildcards;
foreach $key (keys(%xmlfields)) {
    if (index($key, "*") >= 0) {
	my $regex = '^' . $key . '$';
	$regex =~ s/\*\$$/$tailpat/;
	$regex =~ s/\*/$wordpat/g;
	$wildcards{$key} = $regex;
    }
}
# Key ordering is lost in a hash.
# Put longer matching wildcard keys before their prefix.
my @wildkeys = reverse(sort(keys(%wildcards)));

220 221
foreach $key (keys(%{ $xmlparse->{'attribute'} })) {
    my $value = $xmlparse->{'attribute'}->{"$key"}->{'value'};
222 223 224
    if (!defined($value)) {	# Empty string comes from XML as an undef value.
	$xmlparse->{'attribute'}->{"$key"}->{'value'} = $value = "";
    }
225

226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
    print STDERR "User attribute: '$key' -> '$value'\n"
	if ($debug);

    my $field = $key;
    my $wild;
    if (!exists($xmlfields{$key})) {

	# Not a regular key; look for a wildcard regex match.
        foreach my $wildkey (@wildkeys) {
	    my $regex = $wildcards{$wildkey};
	    if ($wild = $key =~ /$regex/) {
		$field = $wildkey;
		print STDERR "Wildcard: '$key' matches '$wildkey'\n"
		    if ($debug);
		last; # foreach $wildkey
	    }
	}
	if (!$wild) {
	    $errors{$key} = "Unknown attribute";
	    next; # foreach $key
246 247 248
	}
    }

249
    my ($dbslot, $required, $default) = @{$xmlfields{$field}};
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273

    if ($required & $SLOT_REQUIRED) {
	# A slot that must be provided, so do not allow a null value.
	if (!defined($value)) {
	    $errors{$key} = "Must provide a non-null value";
	    next;
	}
    }
    if ($required & $SLOT_OPTIONAL) {
	# Optional slot. If value is null skip it. Might not be the correct
	# thing to do all the time?
	if (!defined($value)) {
	    next
		if (!defined($default));
	    $value = $default;
	}
    }
    if ($required & $SLOT_ADMINONLY) {
	# Admin implies optional, but thats probably not correct approach.
	$errors{$key} = "Administrators only"
	    if (! $this_user->IsAdmin());
    }
	
    # Now check that the value is legal.
274 275
    if (! TBcheck_dbslot($value, "groups",
			 $dbslot, TBDB_CHECKDBSLOT_ERROR)) {
276 277 278 279
	$errors{$key} = TBFieldErrorString();
	next;
    }

280
    $editgroup_args{$key} = $value;
281 282 283 284 285 286 287
}
UserError()
    if (keys(%errors));

#
# Now do special checks.
#
288
my $group = Group->Lookup($editgroup_args{"group"});
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
if (!defined($group)) {
    UserError("Group: No such group");
}
if (!$group->AccessCheck($this_user, TB_PROJECT_EDITGROUP())) {
    UserError("Group: Not enough permission");
}

# More checking is done in the first pass of Group->EditGroup().

exit(0)
    if ($verify);

#
# Now safe to edit group membership.
#
# We pass the group along as an argument to EditGroup(), so remove it from
# the argument array.
#
307
delete($editgroup_args{"group"});
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343

my $usrerr;
my $editgroup_val = Group->EditGroup($group, $this_user,
				     \%editgroup_args, \$usrerr);
UserError($usrerr)
    if (defined($usrerr));
fatal("Could not create new Group!")
    if (!defined($editgroup_val));
exit(0);

sub fatal($)
{
    my ($mesg) = @_;

    print STDERR "*** $0:\n".
	         "    $mesg\n";
    # Exit with negative status so web interface treats it as system error.
    exit(-1);
}

sub UserError(;$)
{
    my ($mesg) = @_;

    if (keys(%errors)) {
	foreach my $key (keys(%errors)) {
	    my $val = $errors{$key};
	    print "${key}: $val\n";
	}
    }
    print "$mesg\n"
	if (defined($mesg));

    # Exit with positive status so web interface treats it as user error.
    exit(1);
}