src/passwordstore.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 2016 The Claws Mail Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #ifdef PASSWORD_CRYPTO_GNUTLS
  26 # include <gnutls/gnutls.h>
  27 # include <gnutls/crypto.h>
  28 #endif
  29
  30 #include <glib.h>
  31 #include <glib/gi18n.h>
  32
  33 #include "common/defs.h"
  34 #include "common/utils.h"
  35 #include "passwordstore.h"
  36 #include "password.h"
  37 #include "prefs_gtk.h"
  38
  39 static GSList *_password_store;
  40
  41 /* Finds password block of given type and name in the pwdstore. */
  42 static PasswordBlock *_get_block(PasswordBlockType block_type,
  43                 const gchar *block_name)
  44 {
  45         GSList *item;
  46         PasswordBlock *block;
  47
  48         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
  49                         NULL);
  50         g_return_val_if_fail(block_name != NULL, NULL);
  51
  52         for (item = _password_store; item != NULL; item = item->next) {
  53                 block = (PasswordBlock *)item->data;
  54                 if (block->block_type == block_type &&
  55                                 !strcmp(block->block_name, block_name))
  56                         return block;
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static gboolean _hash_equal_func(gconstpointer a, gconstpointer b)
  63 {
  64         if (g_strcmp0((const gchar *)a, (const gchar *)b) == 0)
  65                 return TRUE;
  66         return FALSE;
  67 }
  68
  69 /* Creates a new, empty block and adds it to the pwdstore. */
  70 static PasswordBlock *_new_block(PasswordBlockType block_type,
  71                 const gchar *block_name)
  72 {
  73         PasswordBlock *block;
  74
  75         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
  76                         NULL);
  77         g_return_val_if_fail(block_name != NULL, NULL);
  78
  79         /* First check to see if the block doesn't already exist. */
  80         if (_get_block(block_type, block_name)) {
  81                 debug_print("Block (%d/%s) already exists.\n",
  82                                 block_type, block_name);
  83                 return NULL;
  84         }
  85
  86         /* Let's create an empty block, and add it to pwdstore. */
  87         block = g_new0(PasswordBlock, 1);
  88         block->block_type = block_type;
  89         block->block_name = g_strdup(block_name);
  90         block->entries = g_hash_table_new_full(g_str_hash,
  91                         (GEqualFunc)_hash_equal_func,
  92                         g_free, g_free);
  93         debug_print("Created password block (%d/%s)\n",
  94                         block_type, block_name);
  95
  96         _password_store = g_slist_append(_password_store, block);
  97
  98         return block;
  99 }
 100
 101 ///////////////////////////////////////////////////////////////
 102
 103 /* Stores a password. */
 104 gboolean passwd_store_set(PasswordBlockType block_type,
 105                 const gchar *block_name,
 106                 const gchar *password_id,
 107                 const gchar *password,
 108                 gboolean encrypted)
 109 {
 110         const gchar *p = password;
 111         PasswordBlock *block;
 112         gchar *encrypted_password;
 113
 114         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
 115                         FALSE);
 116         g_return_val_if_fail(block_name != NULL, FALSE);
 117         g_return_val_if_fail(password_id != NULL, FALSE);
 118
 119         /* Empty password string equals null password for us. */
 120         if (strlen(password) == 0)
 121                 p = NULL;
 122
 123         debug_print("%s password '%s' in block (%d/%s)%s\n",
 124                         (p == NULL ? "Deleting" : "Storing"),
 125                         password_id, block_type, block_name,
 126                         (encrypted ? ", already encrypted" : "") );
 127
 128         // find correct block (create if needed)
 129         if ((block = _get_block(block_type, block_name)) == NULL) {
 130                 /* If caller wants to delete a password, and even its block
 131                  * doesn't exist, we're done. */
 132                 if (p == NULL)
 133                         return TRUE;
 134
 135                 if ((block = _new_block(block_type, block_name)) == NULL) {
 136                         debug_print("Could not create password block (%d/%s)\n",
 137                                         block_type, block_name);
 138                         return FALSE;
 139                 }
 140         }
 141
 142         if (p == NULL) {
 143                 /* NULL password was passed to us, so delete the entry with
 144                  * corresponding id */
 145                 g_hash_table_remove(block->entries, password_id);
 146         } else {
 147                 if (!encrypted) {
 148                         /* encrypt password before saving it */
 149                         if ((encrypted_password =
 150                                                 password_encrypt(p, NULL)) == NULL) {
 151                                 debug_print("Could not encrypt password '%s' for block (%d/%s).\n",
 152                                                 password_id, block_type, block_name);
 153                                 return FALSE;
 154                         }
 155                 } else {
 156                         /* password is already in encrypted form already */
 157                         encrypted_password = g_strdup(p);
 158                 }
 159
 160                 // add encrypted password to the block
 161                 g_hash_table_insert(block->entries,
 162                                 g_strdup(password_id),
 163                                 encrypted_password);
 164         }
 165
 166         return TRUE;
 167 }
 168
 169 /* Retrieves a password. */
 170 gchar *passwd_store_get(PasswordBlockType block_type,
 171                 const gchar *block_name,
 172                 const gchar *password_id)
 173 {
 174         PasswordBlock *block;
 175         gchar *encrypted_password, *password;
 176
 177         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
 178                         NULL);
 179         g_return_val_if_fail(block_name != NULL, NULL);
 180         g_return_val_if_fail(password_id != NULL, NULL);
 181
 182         debug_print("Getting password '%s' from block (%d/%s)\n",
 183                         password_id, block_type, block_name);
 184
 185         // find correct block
 186         if ((block = _get_block(block_type, block_name)) == NULL) {
 187                 debug_print("Block (%d/%s) not found.\n", block_type, block_name);
 188                 return NULL;
 189         }
 190
 191         // grab pointer to encrypted password
 192         if ((encrypted_password =
 193                                 g_hash_table_lookup(block->entries, password_id)) == NULL) {
 194                 debug_print("Password '%s' in block (%d/%s) not found.\n",
 195                                 password_id, block_type, block_name);
 196                 return NULL;
 197         }
 198
 199         // decrypt password
 200         if ((password =
 201                                 password_decrypt(encrypted_password, NULL)) == NULL) {
 202                 debug_print("Could not decrypt password '%s' for block (%d/%s).\n",
 203                                 password_id, block_type, block_name);
 204                 return NULL;
 205         }
 206
 207         // return decrypted password
 208         return password;
 209 }
 210
 211 gboolean passwd_store_set_account(gint account_id,
 212                 const gchar *password_id,
 213                 const gchar *password,
 214                 gboolean encrypted)
 215 {
 216         gchar *uid = g_strdup_printf("%d", account_id);
 217         gboolean ret = passwd_store_set(PWS_ACCOUNT, uid,
 218                         password_id, password, encrypted);
 219         g_free(uid);
 220         return ret;
 221 }
 222
 223 gchar *passwd_store_get_account(gint account_id,
 224                 const gchar *password_id)
 225 {
 226         gchar *uid = g_strdup_printf("%d", account_id);
 227         gchar *ret = passwd_store_get(PWS_ACCOUNT, uid, password_id);
 228         g_free(uid);
 229         return ret;
 230 }
 231
 232 /* Reencrypts all stored passwords. */
 233 void passwd_store_reencrypt_all(const gchar *old_mpwd,
 234                 const gchar *new_mpwd)
 235 {
 236         PasswordBlock *block;
 237         GSList *item;
 238         GList *keys, *eitem;
 239         gchar *encrypted_password, *decrypted_password, *key;
 240
 241         g_return_if_fail(old_mpwd != NULL);
 242         g_return_if_fail(new_mpwd != NULL);
 243
 244         for (item = _password_store; item != NULL; item = item->next) {
 245                 block = (PasswordBlock *)item->data;
 246                 if (block == NULL)
 247                         continue; /* Just in case. */
 248
 249                 debug_print("Reencrypting passwords in block (%d/%s).\n",
 250                                 block->block_type, block->block_name);
 251
 252                 if (g_hash_table_size(block->entries) == 0)
 253                         continue;
 254
 255                 keys = g_hash_table_get_keys(block->entries);
 256                 for (eitem = keys; eitem != NULL; eitem = eitem->next) {
 257                         key = (gchar *)eitem->data;
 258                         if ((encrypted_password =
 259                                                 g_hash_table_lookup(block->entries, key)) == NULL)
 260                                 continue;
 261
 262                         if ((decrypted_password =
 263                                                 password_decrypt(encrypted_password, old_mpwd)) == NULL) {
 264                                 debug_print("Reencrypt: couldn't decrypt password for '%s'.\n", key);
 265                                 continue;
 266                         }
 267
 268                         encrypted_password = password_encrypt(decrypted_password, new_mpwd);
 269                         memset(decrypted_password, 0, strlen(decrypted_password));
 270                         g_free(decrypted_password);
 271                         if (encrypted_password == NULL) {
 272                                 debug_print("Reencrypt: couldn't encrypt password for '%s'.\n", key);
 273                                 continue;
 274                         }
 275
 276                         g_hash_table_insert(block->entries, g_strdup(key), encrypted_password);
 277                 }
 278
 279                 g_list_free(keys);
 280         }
 281
 282         debug_print("Reencrypting done.\n");
 283 }
 284
 285 static gint _write_to_file(FILE *fp)
 286 {
 287         PasswordBlock *block;
 288         GSList *item;
 289         GList *keys, *eitem;
 290         gchar *typestr, *line, *key, *pwd;
 291
 292         for (item = _password_store; item != NULL; item = item->next) {
 293                 block = (PasswordBlock*)item->data;
 294                 if (block == NULL)
 295                         continue; /* Just in case. */
 296
 297                 /* Do not save empty blocks. */
 298                 if (g_hash_table_size(block->entries) == 0)
 299                         continue;
 300
 301                 /* Prepare the section header string and write it out. */
 302                 typestr = NULL;
 303                 if (block->block_type == PWS_CORE) {
 304                         typestr = "core";
 305                 } else if (block->block_type == PWS_ACCOUNT) {
 306                         typestr = "account";
 307                 } else if (block->block_type == PWS_PLUGIN) {
 308                         typestr = "plugin";
 309                 }
 310                 line = g_strdup_printf("[%s:%s]\n", typestr, block->block_name);
 311
 312                 if (fputs(line, fp) == EOF) {
 313                         FILE_OP_ERROR("password store", "fputs");
 314                         g_free(line);
 315                         return -1;
 316                 }
 317                 g_free(line);
 318
 319                 /* Now go through all passwords in the block and write each out. */
 320                 keys = g_hash_table_get_keys(block->entries);
 321                 for (eitem = keys; eitem != NULL; eitem = eitem->next) {
 322                         key = (gchar *)eitem->data;
 323                         if ((pwd = g_hash_table_lookup(block->entries, key)) == NULL)
 324                                 continue;
 325
 326                         line = g_strdup_printf("%s %s\n", key, pwd);
 327                         if (fputs(line, fp) == EOF) {
 328                                 FILE_OP_ERROR("password store", "fputs");
 329                                 g_free(line);
 330                                 return -1;
 331                         }
 332                         g_free(line);
 333                 }
 334                 g_list_free(keys);
 335
 336                 if (item->next != NULL && fputs("\n", fp) == EOF) {
 337                         FILE_OP_ERROR("password store", "fputs");
 338                         return -1;
 339                 }
 340
 341         }
 342
 343         return 1;
 344 }
 345
 346 void passwd_store_write_config(void)
 347 {
 348         gchar *rcpath;
 349         PrefFile *pfile;
 350
 351         debug_print("Writing password store...\n");
 352
 353         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 354                         PASSWORD_STORE_RC, NULL);
 355
 356         if ((pfile = prefs_write_open(rcpath)) == NULL) {
 357                 g_warning("failed to open password store file for writing");
 358                 g_free(rcpath);
 359                 return;
 360         }
 361
 362         g_free(rcpath);
 363
 364         if (_write_to_file(pfile->fp) < 0) {
 365                 g_warning("failed to write password store to file");
 366                 prefs_file_close_revert(pfile);
 367         } else if (prefs_file_close(pfile) < 0) {
 368                 g_warning("failed to properly close password store file after writing");
 369         }
 370 }
 371
 372 void passwd_store_read_config(void)
 373 {
 374         gchar *rcpath, *contents, **lines, **line, *typestr, *name;
 375         GError *error = NULL;
 376         guint i = 0;
 377         PasswordBlock *block = NULL;
 378         PasswordBlockType type;
 379
 380         // TODO: passwd_store_clear();
 381
 382         debug_print("Reading password store from file...\n");
 383
 384         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 385                         PASSWORD_STORE_RC, NULL);
 386
 387         if (!g_file_get_contents(rcpath, &contents, NULL, &error)) {
 388                 g_warning("couldn't read password store from file: %s\n", error->message);
 389                 g_error_free(error);
 390                 g_free(rcpath);
 391                 return;
 392         }
 393         g_free(rcpath);
 394
 395         lines = g_strsplit(contents, "\n", -1);
 396
 397         while (lines[i] != NULL) {
 398                 if (*lines[i] == '[') {
 399                         /* Beginning of a new block */
 400                         line = g_strsplit_set(lines[i], "[:]", -1);
 401                         if (line[0] != NULL && strlen(line[0]) == 0
 402                                         && line[1] != NULL && strlen(line[1]) > 0
 403                                         && line[2] != NULL && strlen(line[2]) > 0
 404                                         && line[3] != NULL && strlen(line[3]) == 0) {
 405                                 typestr = line[1];
 406                                 name = line[2];
 407                                 if (!strcmp(typestr, "core")) {
 408                                         type = PWS_CORE;
 409                                 } else if (!strcmp(typestr, "account")) {
 410                                         type = PWS_ACCOUNT;
 411                                 } else if (!strcmp(typestr, "plugin")) {
 412                                         type = PWS_PLUGIN;
 413                                 } else {
 414                                         debug_print("Uknown password block type: '%s'\n", typestr);
 415                                         g_strfreev(line);
 416                                         i++; continue;
 417                                 }
 418
 419                                 if ((block = _new_block(type, name)) == NULL) {
 420                                         debug_print("Duplicate password block, ignoring: (%d/%s)\n",
 421                                                         type, name);
 422                                         g_strfreev(line);
 423                                         i++; continue;
 424                                 }
 425                         }
 426                         g_strfreev(line);
 427                 } else if (strlen(lines[i]) > 0 && block != NULL) {
 428                         /* If we have started a password block, test for a
 429                          * "password_id = password" line. */
 430                         line = g_strsplit(lines[i], " ", -1);
 431                         if (line[0] != NULL && strlen(line[0]) > 0
 432                                         && line[1] != NULL && strlen(line[1]) > 0
 433                                         && line[2] == NULL) {
 434                                 debug_print("Adding password '%s'\n", line[0]);
 435                                 g_hash_table_insert(block->entries,
 436                                                 g_strdup(line[0]), g_strdup(line[1]));
 437                         }
 438                         g_strfreev(line);
 439                 }
 440                 i++;
 441         }
 442         g_strfreev(lines);
 443 }