pwmdGenPassWidget.cpp

   1 /*
   2     Copyright (C) 2010-2023 Ben Kibbey <bjk@luxsci.net>
   3
   4     This file is part of qpwmc.
   5
   6     This library is free software; you can redistribute it and/or
   7     modify it under the terms of the GNU Lesser General Public
   8     License as published by the Free Software Foundation; either
   9     version 2.1 of the License, or (at your option) any later version.
  10
  11     This library is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14     Lesser General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public
  17     License along with this library; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  19     USA
  20 */
  21 #include <QApplication>
  22 #include <QClipboard>
  23 #include <QDateTime>
  24 #include <QSettings>
  25 #include <QRandomGenerator>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include "pwmdGenPassWidget.h"
  29 #include <libpwmd.h>
  30
  31 PwmdGenPassWidget::PwmdGenPassWidget (QWidget * p) : QFrame (p)
  32 {
  33   ui.setupUi (this);
  34   connect (ui.ck_showPassword, SIGNAL (clicked ()), this,
  35            SLOT (slotShowPassword ()));
  36   connect (ui.pb_generate, SIGNAL (clicked ()), this,
  37            SLOT (slotGeneratePassword ()));
  38   connect (ui.generateComboBox, SIGNAL (activated (int)), this,
  39            SLOT (slotGenerateTypeChanged (int)));
  40   connect (ui.pb_clipboard, SIGNAL (clicked ()), this,
  41            SLOT (slotClipboardPassword ()));
  42
  43   connect (ui.constraintsComboBox, SIGNAL (activated (int)), this,
  44            SLOT (slotConstraintsTypeChanged (int)));
  45   connect (ui.le_constraints, SIGNAL (textChanged (const QString &)), this,
  46            SLOT (slotConstraintsTextChanged (const QString &)));
  47
  48   if (!(pwmd_features () & PWMD_FEATURE_QUALITY))
  49     ui.pg_strength->setHidden (true);
  50   else
  51     {
  52       connect (ui.le_password, SIGNAL (textChanged (const QString &)), this,
  53                SLOT (slotPasswordTextChanged (const QString &)));
  54       connect (ui.le_password, SIGNAL (textEdited (const QString &)), this,
  55                SLOT (slotPasswordTextChanged (const QString &)));
  56     }
  57
  58   ui.le_constraints->setValidator (new QRegularExpressionValidator (QRegularExpression ("[^ ]*"), this));
  59   ui.pb_clipboard->setEnabled (false);
  60   _modified = false;
  61 }
  62
  63 unsigned
  64 PwmdGenPassWidget::quality (const QString &str, unsigned max, double &bits)
  65 {
  66   if (!(pwmd_features () & PWMD_FEATURE_QUALITY))
  67     return 0;
  68
  69   int r;
  70   bits = 0;
  71   (void)pwmd_test_quality (str.toUtf8 ().data (), &bits);
  72
  73   r = (int)((bits/max)*100);
  74   if (r > 100)
  75     r = 100;
  76
  77   return r;
  78 }
  79
  80 void
  81 PwmdGenPassWidget::slotConstraintsTextChanged (const QString &)
  82 {
  83   setModified ();
  84 }
  85
  86 void
  87 PwmdGenPassWidget::slotPasswordTextChanged (const QString &str)
  88 {
  89   double bits = 0;
  90   unsigned n = quality (str.toUtf8 ().data (), PwmdGenPassWidget::MaxEntropyBits, bits);
  91
  92   ui.pg_strength->setValue (n);
  93   ui.pg_strength->setFormat (QString (tr ("Strength %p% (%1 bits)")).arg (bits));
  94   ui.pb_clipboard->setEnabled (!str.isEmpty ());
  95   ui.lengthSpinBox->setValue (str.isEmpty () ? 16 : str.length ());
  96   setModified ();
  97 }
  98
  99 void
 100 PwmdGenPassWidget::setPassword (const QString &s, bool ro)
 101 {
 102   ui.le_password->setText (s);
 103   ui.le_password->setReadOnly (ro);
 104 }
 105
 106 void
 107 PwmdGenPassWidget::slotShowPassword ()
 108 {
 109   bool b = ui.ck_showPassword->isChecked ();
 110
 111   ui.le_password->setEchoMode (!b ? QLineEdit::Password : QLineEdit::Normal);
 112 }
 113
 114 QString
 115 PwmdGenPassWidget::constraints (const QString &s, bool &invert)
 116 {
 117   QString constraint = ui.le_constraints->text ();
 118   invert = false;
 119
 120   if (constraint.isEmpty ())
 121     return s;
 122
 123   if (ui.constraintsComboBox->currentIndex () == 0)
 124     return s;
 125   else if (ui.constraintsComboBox->currentIndex () == 1)
 126     return s.isEmpty () ? constraint : s + "," + constraint;
 127   else
 128     {
 129       invert = true;
 130       return s.isEmpty () ? "! " + constraint : s + ",! " + constraint;
 131     }
 132
 133   return QString ();
 134 }
 135
 136 void
 137 PwmdGenPassWidget::slotGeneratePassword ()
 138 {
 139   QString result = QString ();
 140   bool invert = false;
 141   QString constraint = constraints (QString (), invert);
 142
 143   switch (ui.generateComboBox->currentIndex ())
 144     {
 145     case 0:
 146       result = PwmdGenPassWidget::generate (PwmdGenPassWidget::Any,
 147                                             ui.lengthSpinBox->value (),
 148                                             constraint, invert);
 149       break;
 150     case 1:
 151       result = PwmdGenPassWidget::generate (PwmdGenPassWidget::AlphaNumeric,
 152                                             ui.lengthSpinBox->value (),
 153                                             constraint, invert);
 154       break;
 155     case 2:
 156       result = PwmdGenPassWidget::generate (PwmdGenPassWidget::Alpha,
 157                                             ui.lengthSpinBox->value (),
 158                                             constraint, invert);
 159       break;
 160     case 3:
 161       result = PwmdGenPassWidget::generate (PwmdGenPassWidget::Numeric,
 162                                             ui.lengthSpinBox->value (),
 163                                             constraint, invert);
 164       break;
 165     default:
 166       break;
 167     }
 168
 169   ui.le_password->setText (result);
 170   slotClipboardPassword ();
 171 }
 172
 173 void
 174 PwmdGenPassWidget::slotConstraintsTypeChanged (int idx)
 175 {
 176   ui.le_constraints->setEnabled (idx != 0);
 177   if (!idx)
 178     ui.le_constraints->setText ("");
 179   setModified ();
 180 }
 181
 182 void
 183 PwmdGenPassWidget::slotGenerateTypeChanged (int)
 184 {
 185   setModified ();
 186 }
 187
 188 QString
 189 PwmdGenPassWidget::type ()
 190 {
 191   bool invert;
 192
 193   if (ui.generateComboBox->currentIndex () == 1)
 194     return constraints ("alnum", invert);
 195   else if (ui.generateComboBox->currentIndex () == 2)
 196     return constraints ("alpha", invert);
 197   else if (ui.generateComboBox->currentIndex () == 3)
 198     return constraints ("numeric", invert);
 199
 200   return constraints (QString (), invert);
 201 }
 202
 203 void
 204 PwmdGenPassWidget::setType (const QString &s)
 205 {
 206   QStringList t = s.split (',');
 207   QString type = t.count () ? t.at (0) : QString ();
 208   QString constraint = !t.isEmpty () && t.count () > 1 ? t.at (1) : QString ();
 209
 210   if (type == "alnum")
 211     ui.generateComboBox->setCurrentIndex (1);
 212   else if (type == "alpha")
 213     ui.generateComboBox->setCurrentIndex (2);
 214   else if (type == "numeric")
 215     ui.generateComboBox->setCurrentIndex (3);
 216   else
 217     {
 218       if (t.count () == 1)
 219         constraint = s;
 220       ui.generateComboBox->setCurrentIndex (0);
 221     }
 222
 223   ui.le_constraints->setEnabled (!constraint.isEmpty ());
 224
 225   if (constraint.isEmpty ())
 226     ui.constraintsComboBox->setCurrentIndex (0);
 227   else if (constraint.at (0) != '!'
 228            || (constraint.at (0) == '!' && constraint.at (1) != ' '))
 229     ui.constraintsComboBox->setCurrentIndex (1);
 230   else
 231     {
 232       ui.constraintsComboBox->setCurrentIndex (2);
 233       constraint = constraint.mid (2);
 234     }
 235
 236   ui.le_constraints->setText (constraint);
 237 }
 238
 239 // Generate a passphrase of length 'len' from the characters in 'str'. The
 240 // constraint adds characters after generating or removes in the case 'invert'
 241 // is true.
 242 QString
 243 PwmdGenPassWidget::generate (const QString & str, int len, QString constraint,
 244                              bool invert)
 245 {
 246   QString s = QString ();
 247   int max = 0;
 248   QSettings cfg ("qpwmc");
 249   int freq = cfg.value ("constraintsFreq", 30).toInt ();
 250
 251   // Replace 30 percent of random characters in str of 'len' with the
 252   // constraint when not inverted.
 253   if (!constraint.isEmpty ())
 254     {
 255       max = len * freq / 100;
 256       if (!max)
 257         max++;
 258     }
 259
 260   // Prevent inifinate loop when all characters of the constraint match some
 261   // order in 'str'.
 262   if (invert && !constraint.isEmpty ())
 263     {
 264       int n = 0;
 265
 266       foreach (QChar c, constraint)
 267         {
 268           if (str.contains (c))
 269             n++;
 270         }
 271
 272       if (n == str.length ())
 273         {
 274           constraint = QString ();
 275           invert = false;
 276         }
 277     }
 278
 279   for (int i = 0; i < len; i++)
 280     {
 281       QChar c;
 282
 283       // Don't include characters in 'constraint'.
 284       do
 285         {
 286           c = str.at (QRandomGenerator::system ()->generate () % str.length ());
 287         } while (invert && !constraint.isEmpty () && constraint.contains (c));
 288
 289       s.append (c);
 290     }
 291
 292   if (!invert && !constraint.isEmpty ())
 293     {
 294       QList <int> list;
 295       int count = 0;
 296
 297       // Put 'max' random characters of the constraint in the result.
 298       do
 299         {
 300           int n;
 301           do
 302             {
 303               n = QRandomGenerator::system ()->generate () % s.length ();
 304             } while (list.contains (n) && list.length () < len);
 305
 306           QChar c = constraint.at
 307             (QRandomGenerator::system ()->generate () % constraint.length ());
 308           s.replace (n, 1, c);
 309           list.append (n);
 310           if (list.length () == len - 1)
 311             break;
 312         }
 313       while (++count < max);
 314     }
 315
 316   return s;
 317 }
 318
 319 QString
 320 PwmdGenPassWidget::generate (Type t, int len, const QString &constraint,
 321                              bool invert)
 322 {
 323   QString result = QString ();
 324
 325   switch (t)
 326     {
 327     case Any:
 328       result =
 329         generate (tr
 330                   ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789`~-_=+!@#$%^&*()][\\{}|';\":?></.,"),
 331                   len, constraint, invert);
 332       break;
 333     case AlphaNumeric:
 334         {
 335           QRegularExpression re_n ("[0-9]+");
 336           QRegularExpression re_a ("[a-z]+", QRegularExpression::CaseInsensitiveOption);
 337
 338           do
 339             {
 340               result = generate (tr ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"), len, constraint, invert);
 341             } while (len > 1 && !invert
 342                      && (constraint.isEmpty () || (!constraint.isEmpty () && len >= constraint.length ()))
 343                      && (!result.contains (re_n) || !result.contains (re_a)));
 344         }
 345       break;
 346     case Alpha:
 347       result =
 348         generate (tr
 349                   ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"),
 350                   len, constraint, invert);
 351       break;
 352     case Numeric:
 353       result = generate (tr ("0123456789"), len, constraint, invert);
 354       break;
 355     default:
 356       break;
 357     }
 358
 359   return result;
 360 }
 361
 362 QString
 363 PwmdGenPassWidget::password ()
 364 {
 365   return ui.le_password->text ();
 366 }
 367
 368 void
 369 PwmdGenPassWidget::clipboardPassword ()
 370 {
 371   slotClipboardPassword ();
 372 }
 373
 374 void
 375 PwmdGenPassWidget::slotClipboardPassword ()
 376 {
 377   QClipboard *c = QApplication::clipboard ();
 378
 379   if (c->supportsSelection ())
 380     c->setText (ui.le_password->text (), QClipboard::Selection);
 381   c->setText (ui.le_password->text ());
 382
 383   emit clipboardTimer ();
 384 }
 385
 386 void
 387 PwmdGenPassWidget::setModified (bool b)
 388 {
 389   _modified = b;
 390   if (b)
 391     emit modified ();
 392 }
 393
 394 bool
 395 PwmdGenPassWidget::isModified ()
 396 {
 397   return _modified;
 398 }
 399
 400 void
 401 PwmdGenPassWidget::setEditable (bool b)
 402 {
 403   ui.gr_generate->setEnabled (b);
 404   ui.le_password->setReadOnly (!b);
 405 }