RT#29354: Password Security in Email [v3 merge]

3 files changed, 65 insertions, 7 deletions

diff --git a/FS/FS/ClientAPI/MyAccount.pm b/FS/FS/ClientAPI/MyAccount.pm
index 8ab14fce9..f50b9f1bf 100644
--- a/FS/FS/ClientAPI/MyAccount.pm
+++ b/FS/FS/ClientAPI/MyAccount.pm
@@ -2947,12 +2947,6 @@ sub myaccount_passwd {
         )
     && ! $svc_acct->check_password($p->{'old_password'});
 
-    # should move password length checks into is_password_allowed
-  $error = 'Password too short.'
-    if length($p->{'new_password'}) < ($conf->config('passwordmin') || 6);
-  $error = 'Password too long.'
-    if length($p->{'new_password'}) > ($conf->config('passwordmax') || 8);
-
   $error ||= $svc_acct->is_password_allowed($p->{'new_password'})
          ||  $svc_acct->set_password($p->{'new_password'})
          ||  $svc_acct->replace();
diff --git a/FS/FS/Password_Mixin.pm b/FS/FS/Password_Mixin.pm
index 4ecf4c611..ae82b96d3 100644
--- a/FS/FS/Password_Mixin.pm
+++ b/FS/FS/Password_Mixin.pm
@@ -6,6 +6,7 @@ use FS::password_history;
 use Authen::Passphrase;
 use Authen::Passphrase::BlowfishCrypt;
 # https://rt.cpan.org/Ticket/Display.html?id=72743
+use Data::Password qw(:all);
 
 our $DEBUG = 0;
 our $conf;
@@ -44,7 +45,34 @@ sub is_password_allowed {
   my $self = shift;
   my $password = shift;
 
-  # check length and complexity here
+  # basic checks using Data::Password;
+  # options for Data::Password
+  $DICTIONARY = 4;   # minimum length of disallowed words
+  $MINLEN = $conf->config('passwordmin') || 6;
+  $MAXLEN = $conf->config('passwordmax') || 8;
+  $GROUPS = 4;       # must have all 4 'character groups': numbers, symbols, uppercase, lowercase
+  # other options use the defaults listed below:
+  # $FOLLOWING = 3;    # disallows more than 3 chars in a row, by alphabet or keyboard (ie abcd or asdf)
+  # $SKIPCHAR = undef; # set to true to skip checking for bad characters
+  # # lists of disallowed words
+  # @DICTIONARIES = qw( /usr/share/dict/web2 /usr/share/dict/words /usr/share/dict/linux.words );
+
+  my $error = IsBadPassword($password);
+  $error = 'must contain at least one each of numbers, symbols, and lowercase and uppercase letters'
+    if $error eq 'contains less than 4 character groups'; # avoid confusion
+  $error = 'Invalid password - ' . $error if $error;
+  return $error if $error;
+
+  #check against known usernames
+  my @disallowed_names = $self->password_disallowed_names;
+  foreach my $noname (@disallowed_names) {
+    if ($password =~ /$noname/i) {
+      #keeping message ambiguous to avoid leaking personal info
+      return 'Password contains a disallowed word';
+    }
+  }
+
+  return '' unless $self->get($self->primary_key); # for validating new passwords pre-insert
 
   if ( $conf->config('password-no_reuse') =~ /^(\d+)$/ ) {
 
@@ -80,6 +108,17 @@ sub is_password_allowed {
   '';
 }
 
+=item password_disallowed_names
+
+Override to return a list additional words (eg usernames) not
+to be used by passwords on this service.
+
+=cut
+
+sub password_disallowed_names {
+  return ();
+}
+
 =item password_history_key
 
 Returns the name of the field in L<FS::password_history> that's the foreign
diff --git a/FS/FS/svc_acct.pm b/FS/FS/svc_acct.pm
index a8cb7ba5b..233250554 100644
--- a/FS/FS/svc_acct.pm
+++ b/FS/FS/svc_acct.pm
@@ -2775,6 +2775,31 @@ sub virtual_maildir {
   $self->domain. '/maildirs/'. $self->username. '/';
 }
 
+=item password_disallowed_names
+
+Override, for L<FS::Password_Mixin>.  Not really intended for other use.
+
+=cut
+
+sub password_disallowed_names {
+  my $self = shift;
+  my $dbh = dbh;
+  my $results = {};
+  foreach my $field ( qw( username finger ) ) {
+    my $sql = 'SELECT DISTINCT '.$field.' FROM svc_acct';
+    my $sth = $dbh->prepare($sql)
+      or die "Error preparing $sql: ". $dbh->errstr;
+    $sth->execute()
+      or die "Error executing $sql: ". $sth->errstr;
+    foreach my $row (@{$sth->fetchall_arrayref}, $self->get($field)) {
+      foreach my $word (split(/\s+/,$$row[0])) {
+        $results->{lc($word)} = 1;
+      }
+    }
+  }
+  return keys %$results;
+}
+
 =back
 
 =head1 CLASS METHODS