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         PasswordBlock *block;
 111         gchar *encrypted_password;
 112
 113         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
 114                         FALSE);
 115         g_return_val_if_fail(block_name != NULL, FALSE);
 116         g_return_val_if_fail(password_id != NULL, FALSE);
 117
 118         debug_print("%s password '%s' in block (%d/%s)%s\n",
 119                         (password == NULL ? "Deleting" : "Storing"),
 120                         password_id, block_type, block_name,
 121                         (encrypted ? ", already encrypted" : "") );
 122
 123         // find correct block (create if needed)
 124         if ((block = _get_block(block_type, block_name)) == NULL &&
 125                         (block = _new_block(block_type, block_name)) == NULL) {
 126                 debug_print("Could not create password block (%d/%s)\n",
 127                                 block_type, block_name);
 128                 return FALSE;
 129         }
 130
 131         if (password == NULL) {
 132                 /* NULL password was passed to us, so delete the entry with
 133                  * corresponding id */
 134                 g_hash_table_remove(block->entries, password_id);
 135         } else {
 136                 if (!encrypted) {
 137                         /* encrypt password before saving it */
 138                         if ((encrypted_password =
 139                                                 password_encrypt(password, NULL)) == NULL) {
 140                                 debug_print("Could not encrypt password '%s' for block (%d/%s).\n",
 141                                                 password_id, block_type, block_name);
 142                                 return FALSE;
 143                         }
 144                 } else {
 145                         /* password is already in encrypted form already */
 146                         encrypted_password = g_strdup(password);
 147                 }
 148
 149                 // add encrypted password to the block
 150                 g_hash_table_insert(block->entries,
 151                                 g_strdup(password_id),
 152                                 encrypted_password);
 153         }
 154
 155         return TRUE;
 156 }
 157
 158 /* Retrieves a password. */
 159 gchar *passwd_store_get(PasswordBlockType block_type,
 160                 const gchar *block_name,
 161                 const gchar *password_id)
 162 {
 163         PasswordBlock *block;
 164         gchar *encrypted_password, *password;
 165
 166         g_return_val_if_fail(block_type >= 0 && block_type < NUM_PWS_TYPES,
 167                         NULL);
 168         g_return_val_if_fail(block_name != NULL, NULL);
 169         g_return_val_if_fail(password_id != NULL, NULL);
 170
 171         debug_print("Getting password '%s' from block (%d/%s)\n",
 172                         password_id, block_type, block_name);
 173
 174         // find correct block
 175         if ((block = _get_block(block_type, block_name)) == NULL) {
 176                 debug_print("Block (%d/%s) not found.\n", block_type, block_name);
 177                 return NULL;
 178         }
 179
 180         // grab pointer to encrypted password
 181         if ((encrypted_password =
 182                                 g_hash_table_lookup(block->entries, password_id)) == NULL) {
 183                 debug_print("Password '%s' in block (%d/%s) not found.\n",
 184                                 password_id, block_type, block_name);
 185                 return NULL;
 186         }
 187
 188         // decrypt password
 189         if ((password =
 190                                 password_decrypt(encrypted_password, NULL)) == NULL) {
 191                 debug_print("Could not decrypt password '%s' for block (%d/%s).\n",
 192                                 password_id, block_type, block_name);
 193                 return NULL;
 194         }
 195
 196         // return decrypted password
 197         return password;
 198 }
 199
 200 /* Reencrypts all stored passwords. */
 201 void passwd_store_reencrypt_all(const gchar *old_mpwd,
 202                 const gchar *new_mpwd)
 203 {
 204         PasswordBlock *block;
 205         GSList *item;
 206         GList *keys, *eitem;
 207         gchar *encrypted_password, *decrypted_password, *key;
 208
 209         g_return_if_fail(old_mpwd != NULL);
 210         g_return_if_fail(new_mpwd != NULL);
 211
 212         for (item = _password_store; item != NULL; item = item->next) {
 213                 block = (PasswordBlock *)item->data;
 214                 if (block == NULL)
 215                         continue; /* Just in case. */
 216
 217                 debug_print("Reencrypting passwords in block (%d/%s).\n",
 218                                 block->block_type, block->block_name);
 219
 220                 if (g_hash_table_size(block->entries) == 0)
 221                         continue;
 222
 223                 keys = g_hash_table_get_keys(block->entries);
 224                 for (eitem = keys; eitem != NULL; eitem = eitem->next) {
 225                         key = (gchar *)eitem->data;
 226                         if ((encrypted_password =
 227                                                 g_hash_table_lookup(block->entries, key)) == NULL)
 228                                 continue;
 229
 230                         if ((decrypted_password =
 231                                                 password_decrypt(encrypted_password, old_mpwd)) == NULL) {
 232                                 debug_print("Reencrypt: couldn't decrypt password for '%s'.\n", key);
 233                                 continue;
 234                         }
 235
 236                         encrypted_password = password_encrypt(decrypted_password, new_mpwd);
 237                         memset(decrypted_password, 0, strlen(decrypted_password));
 238                         g_free(decrypted_password);
 239                         if (encrypted_password == NULL) {
 240                                 debug_print("Reencrypt: couldn't encrypt password for '%s'.\n", key);
 241                                 continue;
 242                         }
 243
 244                         g_hash_table_insert(block->entries, g_strdup(key), encrypted_password);
 245                 }
 246
 247                 g_list_free(keys);
 248         }
 249
 250         debug_print("Reencrypting done.\n");
 251 }
 252
 253 static gint _write_to_file(FILE *fp)
 254 {
 255         PasswordBlock *block;
 256         GSList *item;
 257         GList *keys, *eitem;
 258         gchar *typestr, *line, *key, *pwd;
 259
 260         for (item = _password_store; item != NULL; item = item->next) {
 261                 block = (PasswordBlock*)item->data;
 262                 if (block == NULL)
 263                         continue; /* Just in case. */
 264
 265                 /* Do not save empty blocks. */
 266                 if (g_hash_table_size(block->entries) == 0)
 267                         continue;
 268
 269                 /* Prepare the section header string and write it out. */
 270                 typestr = NULL;
 271                 if (block->block_type == PWS_CORE) {
 272                         typestr = "core";
 273                 } else if (block->block_type == PWS_ACCOUNT) {
 274                         typestr = "account";
 275                 } else if (block->block_type == PWS_PLUGIN) {
 276                         typestr = "plugin";
 277                 }
 278                 line = g_strdup_printf("[%s:%s]\n", typestr, block->block_name);
 279
 280                 if (fputs(line, fp) == EOF) {
 281                         FILE_OP_ERROR("password store", "fputs");
 282                         g_free(line);
 283                         return -1;
 284                 }
 285                 g_free(line);
 286
 287                 /* Now go through all passwords in the block and write each out. */
 288                 keys = g_hash_table_get_keys(block->entries);
 289                 for (eitem = keys; eitem != NULL; eitem = eitem->next) {
 290                         key = (gchar *)eitem->data;
 291                         if ((pwd = g_hash_table_lookup(block->entries, key)) == NULL)
 292                                 continue;
 293
 294                         line = g_strdup_printf("%s %s\n", key, pwd);
 295                         if (fputs(line, fp) == EOF) {
 296                                 FILE_OP_ERROR("password store", "fputs");
 297                                 g_free(line);
 298                                 return -1;
 299                         }
 300                         g_free(line);
 301                 }
 302                 g_list_free(keys);
 303
 304                 if (item->next != NULL && fputs("\n", fp) == EOF) {
 305                         FILE_OP_ERROR("password store", "fputs");
 306                         return -1;
 307                 }
 308
 309         }
 310
 311         return 1;
 312 }
 313
 314 void passwd_store_write_config(void)
 315 {
 316         gchar *rcpath;
 317         PrefFile *pfile;
 318
 319         debug_print("Writing password store...\n");
 320
 321         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 322                         PASSWORD_STORE_RC, NULL);
 323
 324         if ((pfile = prefs_write_open(rcpath)) == NULL) {
 325                 g_warning("failed to open password store file for writing");
 326                 g_free(rcpath);
 327                 return;
 328         }
 329
 330         g_free(rcpath);
 331
 332         if (_write_to_file(pfile->fp) < 0) {
 333                 g_warning("failed to write password store to file");
 334                 prefs_file_close_revert(pfile);
 335         } else if (prefs_file_close(pfile) < 0) {
 336                 g_warning("failed to properly close password store file after writing");
 337         }
 338 }
 339
 340 void passwd_store_read_config(void)
 341 {
 342         gchar *rcpath, *contents, **lines, **line, *typestr, *name;
 343         GError *error = NULL;
 344         guint i = 0;
 345         PasswordBlock *block = NULL;
 346         PasswordBlockType type;
 347
 348         // TODO: passwd_store_clear();
 349
 350         debug_print("Reading password store from file...\n");
 351
 352         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 353                         PASSWORD_STORE_RC, NULL);
 354
 355         if (!g_file_get_contents(rcpath, &contents, NULL, &error)) {
 356                 g_warning("couldn't read password store from file: %s\n", error->message);
 357                 g_error_free(error);
 358                 g_free(rcpath);
 359                 return;
 360         }
 361         g_free(rcpath);
 362
 363         lines = g_strsplit(contents, "\n", -1);
 364
 365         while (lines[i] != NULL) {
 366                 if (*lines[i] == '[') {
 367                         /* Beginning of a new block */
 368                         line = g_strsplit_set(lines[i], "[:]", -1);
 369                         if (line[0] != NULL && strlen(line[0]) == 0
 370                                         && line[1] != NULL && strlen(line[1]) > 0
 371                                         && line[2] != NULL && strlen(line[2]) > 0
 372                                         && line[3] != NULL && strlen(line[3]) == 0) {
 373                                 typestr = line[1];
 374                                 name = line[2];
 375                                 if (!strcmp(typestr, "core")) {
 376                                         type = PWS_CORE;
 377                                 } else if (!strcmp(typestr, "account")) {
 378                                         type = PWS_ACCOUNT;
 379                                 } else if (!strcmp(typestr, "plugin")) {
 380                                         type = PWS_PLUGIN;
 381                                 } else {
 382                                         debug_print("Uknown password block type: '%s'\n", typestr);
 383                                         g_strfreev(line);
 384                                         i++; continue;
 385                                 }
 386
 387                                 if ((block = _new_block(type, name)) == NULL) {
 388                                         debug_print("Duplicate password block, ignoring: (%d/%s)\n",
 389                                                         type, name);
 390                                         g_strfreev(line);
 391                                         i++; continue;
 392                                 }
 393                         }
 394                         g_strfreev(line);
 395                 } else if (strlen(lines[i]) > 0 && block != NULL) {
 396                         /* If we have started a password block, test for a
 397                          * "password_id = password" line. */
 398                         line = g_strsplit(lines[i], " ", -1);
 399                         if (line[0] != NULL && strlen(line[0]) > 0
 400                                         && line[1] != NULL && strlen(line[1]) > 0
 401                                         && line[2] == NULL) {
 402                                 debug_print("Adding password '%s'\n", line[0]);
 403                                 g_hash_table_insert(block->entries,
 404                                                 g_strdup(line[0]), g_strdup(line[1]));
 405                         }
 406                         g_strfreev(line);
 407                 }
 408                 i++;
 409         }
 410         g_strfreev(lines);
 411 }