mdw@git.distorted.org.uk Git - sgt/putty/blob - windows/winstore.c

   1 /*
   2  * winstore.c: Windows-specific implementation of the interface
   3  * defined in storage.h.
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <limits.h>
   9 #include "putty.h"
  10 #include "storage.h"
  11
  12 static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
  13
  14 static char seedpath[2 * MAX_PATH + 10] = "\0";
  15
  16 static const char hex[16] = "0123456789ABCDEF";
  17
  18 static void mungestr(const char *in, char *out)
  19 {
  20     int candot = 0;
  21
  22     while (*in) {
  23         if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
  24             *in == '%' || *in < ' ' || *in > '~' || (*in == '.'
  25                                                      && !candot)) {
  26             *out++ = '%';
  27             *out++ = hex[((unsigned char) *in) >> 4];
  28             *out++ = hex[((unsigned char) *in) & 15];
  29         } else
  30             *out++ = *in;
  31         in++;
  32         candot = 1;
  33     }
  34     *out = '\0';
  35     return;
  36 }
  37
  38 static void unmungestr(const char *in, char *out, int outlen)
  39 {
  40     while (*in) {
  41         if (*in == '%' && in[1] && in[2]) {
  42             int i, j;
  43
  44             i = in[1] - '0';
  45             i -= (i > 9 ? 7 : 0);
  46             j = in[2] - '0';
  47             j -= (j > 9 ? 7 : 0);
  48
  49             *out++ = (i << 4) + j;
  50             if (!--outlen)
  51                 return;
  52             in += 3;
  53         } else {
  54             *out++ = *in++;
  55             if (!--outlen)
  56                 return;
  57         }
  58     }
  59     *out = '\0';
  60     return;
  61 }
  62
  63 void *open_settings_w(const char *sessionname, char **errmsg)
  64 {
  65     HKEY subkey1, sesskey;
  66     int ret;
  67     char *p;
  68
  69     *errmsg = NULL;
  70
  71     if (!sessionname || !*sessionname)
  72         sessionname = "Default Settings";
  73
  74     p = snewn(3 * strlen(sessionname) + 1, char);
  75     mungestr(sessionname, p);
  76
  77     ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
  78     if (ret != ERROR_SUCCESS) {
  79         sfree(p);
  80         *errmsg = dupprintf("Unable to create registry key\n"
  81                             "HKEY_CURRENT_USER\\%s", puttystr);
  82         return NULL;
  83     }
  84     ret = RegCreateKey(subkey1, p, &sesskey);
  85     RegCloseKey(subkey1);
  86     if (ret != ERROR_SUCCESS) {
  87         *errmsg = dupprintf("Unable to create registry key\n"
  88                             "HKEY_CURRENT_USER\\%s\\%s", puttystr, p);
  89         sfree(p);
  90         return NULL;
  91     }
  92     sfree(p);
  93     return (void *) sesskey;
  94 }
  95
  96 void write_setting_s(void *handle, const char *key, const char *value)
  97 {
  98     if (handle)
  99         RegSetValueEx((HKEY) handle, key, 0, REG_SZ, value,
 100                       1 + strlen(value));
 101 }
 102
 103 void write_setting_i(void *handle, const char *key, int value)
 104 {
 105     if (handle)
 106         RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
 107                       (CONST BYTE *) &value, sizeof(value));
 108 }
 109
 110 void close_settings_w(void *handle)
 111 {
 112     RegCloseKey((HKEY) handle);
 113 }
 114
 115 void *open_settings_r(const char *sessionname)
 116 {
 117     HKEY subkey1, sesskey;
 118     char *p;
 119
 120     if (!sessionname || !*sessionname)
 121         sessionname = "Default Settings";
 122
 123     p = snewn(3 * strlen(sessionname) + 1, char);
 124     mungestr(sessionname, p);
 125
 126     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 127         sesskey = NULL;
 128     } else {
 129         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 130             sesskey = NULL;
 131         }
 132         RegCloseKey(subkey1);
 133     }
 134
 135     sfree(p);
 136
 137     return (void *) sesskey;
 138 }
 139
 140 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 141 {
 142     DWORD type, size;
 143     size = buflen;
 144
 145     if (!handle ||
 146         RegQueryValueEx((HKEY) handle, key, 0,
 147                         &type, buffer, &size) != ERROR_SUCCESS ||
 148         type != REG_SZ) return NULL;
 149     else
 150         return buffer;
 151 }
 152
 153 int read_setting_i(void *handle, const char *key, int defvalue)
 154 {
 155     DWORD type, val, size;
 156     size = sizeof(val);
 157
 158     if (!handle ||
 159         RegQueryValueEx((HKEY) handle, key, 0, &type,
 160                         (BYTE *) &val, &size) != ERROR_SUCCESS ||
 161         size != sizeof(val) || type != REG_DWORD)
 162         return defvalue;
 163     else
 164         return val;
 165 }
 166
 167 int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
 168 {
 169     char *settingname;
 170     FontSpec ret;
 171
 172     if (!read_setting_s(handle, name, ret.name, sizeof(ret.name)))
 173         return 0;
 174     settingname = dupcat(name, "IsBold", NULL);
 175     ret.isbold = read_setting_i(handle, settingname, -1);
 176     sfree(settingname);
 177     if (ret.isbold == -1) return 0;
 178     settingname = dupcat(name, "CharSet", NULL);
 179     ret.charset = read_setting_i(handle, settingname, -1);
 180     sfree(settingname);
 181     if (ret.charset == -1) return 0;
 182     settingname = dupcat(name, "Height", NULL);
 183     ret.height = read_setting_i(handle, settingname, INT_MIN);
 184     sfree(settingname);
 185     if (ret.height == INT_MIN) return 0;
 186     *result = ret;
 187     return 1;
 188 }
 189
 190 void write_setting_fontspec(void *handle, const char *name, FontSpec font)
 191 {
 192     char *settingname;
 193
 194     write_setting_s(handle, name, font.name);
 195     settingname = dupcat(name, "IsBold", NULL);
 196     write_setting_i(handle, settingname, font.isbold);
 197     sfree(settingname);
 198     settingname = dupcat(name, "CharSet", NULL);
 199     write_setting_i(handle, settingname, font.charset);
 200     sfree(settingname);
 201     settingname = dupcat(name, "Height", NULL);
 202     write_setting_i(handle, settingname, font.height);
 203     sfree(settingname);
 204 }
 205
 206 int read_setting_filename(void *handle, const char *name, Filename *result)
 207 {
 208     return !!read_setting_s(handle, name, result->path, sizeof(result->path));
 209 }
 210
 211 void write_setting_filename(void *handle, const char *name, Filename result)
 212 {
 213     write_setting_s(handle, name, result.path);
 214 }
 215
 216 void close_settings_r(void *handle)
 217 {
 218     RegCloseKey((HKEY) handle);
 219 }
 220
 221 void del_settings(const char *sessionname)
 222 {
 223     HKEY subkey1;
 224     char *p;
 225
 226     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
 227         return;
 228
 229     p = snewn(3 * strlen(sessionname) + 1, char);
 230     mungestr(sessionname, p);
 231     RegDeleteKey(subkey1, p);
 232     sfree(p);
 233
 234     RegCloseKey(subkey1);
 235 }
 236
 237 struct enumsettings {
 238     HKEY key;
 239     int i;
 240 };
 241
 242 void *enum_settings_start(void)
 243 {
 244     struct enumsettings *ret;
 245     HKEY key;
 246
 247     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
 248         return NULL;
 249
 250     ret = snew(struct enumsettings);
 251     if (ret) {
 252         ret->key = key;
 253         ret->i = 0;
 254     }
 255
 256     return ret;
 257 }
 258
 259 char *enum_settings_next(void *handle, char *buffer, int buflen)
 260 {
 261     struct enumsettings *e = (struct enumsettings *) handle;
 262     char *otherbuf;
 263     otherbuf = snewn(3 * buflen, char);
 264     if (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
 265         unmungestr(otherbuf, buffer, buflen);
 266         sfree(otherbuf);
 267         return buffer;
 268     } else {
 269         sfree(otherbuf);
 270         return NULL;
 271     }
 272 }
 273
 274 void enum_settings_finish(void *handle)
 275 {
 276     struct enumsettings *e = (struct enumsettings *) handle;
 277     RegCloseKey(e->key);
 278     sfree(e);
 279 }
 280
 281 static void hostkey_regname(char *buffer, const char *hostname,
 282                             int port, const char *keytype)
 283 {
 284     int len;
 285     strcpy(buffer, keytype);
 286     strcat(buffer, "@");
 287     len = strlen(buffer);
 288     len += sprintf(buffer + len, "%d:", port);
 289     mungestr(hostname, buffer + strlen(buffer));
 290 }
 291
 292 int verify_host_key(const char *hostname, int port,
 293                     const char *keytype, const char *key)
 294 {
 295     char *otherstr, *regname;
 296     int len;
 297     HKEY rkey;
 298     DWORD readlen;
 299     DWORD type;
 300     int ret, compare;
 301
 302     len = 1 + strlen(key);
 303
 304     /*
 305      * Now read a saved key in from the registry and see what it
 306      * says.
 307      */
 308     otherstr = snewn(len, char);
 309     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 310
 311     hostkey_regname(regname, hostname, port, keytype);
 312
 313     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 314                    &rkey) != ERROR_SUCCESS)
 315         return 1;                      /* key does not exist in registry */
 316
 317     readlen = len;
 318     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 319
 320     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 321         !strcmp(keytype, "rsa")) {
 322         /*
 323          * Key didn't exist. If the key type is RSA, we'll try
 324          * another trick, which is to look up the _old_ key format
 325          * under just the hostname and translate that.
 326          */
 327         char *justhost = regname + 1 + strcspn(regname, ":");
 328         char *oldstyle = snewn(len + 10, char); /* safety margin */
 329         readlen = len;
 330         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 331                               oldstyle, &readlen);
 332
 333         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 334             /*
 335              * The old format is two old-style bignums separated by
 336              * a slash. An old-style bignum is made of groups of
 337              * four hex digits: digits are ordered in sensible
 338              * (most to least significant) order within each group,
 339              * but groups are ordered in silly (least to most)
 340              * order within the bignum. The new format is two
 341              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 342              * A nonzero except in the special case 0x0, which
 343              * doesn't appear anyway in RSA keys) separated by a
 344              * comma. All hex digits are lowercase in both formats.
 345              */
 346             char *p = otherstr;
 347             char *q = oldstyle;
 348             int i, j;
 349
 350             for (i = 0; i < 2; i++) {
 351                 int ndigits, nwords;
 352                 *p++ = '0';
 353                 *p++ = 'x';
 354                 ndigits = strcspn(q, "/");      /* find / or end of string */
 355                 nwords = ndigits / 4;
 356                 /* now trim ndigits to remove leading zeros */
 357                 while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
 358                     ndigits--;
 359                 /* now move digits over to new string */
 360                 for (j = 0; j < ndigits; j++)
 361                     p[ndigits - 1 - j] = q[j ^ 3];
 362                 p += ndigits;
 363                 q += nwords * 4;
 364                 if (*q) {
 365                     q++;               /* eat the slash */
 366                     *p++ = ',';        /* add a comma */
 367                 }
 368                 *p = '\0';             /* terminate the string */
 369             }
 370
 371             /*
 372              * Now _if_ this key matches, we'll enter it in the new
 373              * format. If not, we'll assume something odd went
 374              * wrong, and hyper-cautiously do nothing.
 375              */
 376             if (!strcmp(otherstr, key))
 377                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 378                               strlen(otherstr) + 1);
 379         }
 380     }
 381
 382     RegCloseKey(rkey);
 383
 384     compare = strcmp(otherstr, key);
 385
 386     sfree(otherstr);
 387     sfree(regname);
 388
 389     if (ret == ERROR_MORE_DATA ||
 390         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 391         return 2;                      /* key is different in registry */
 392     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 393         return 1;                      /* key does not exist in registry */
 394     else
 395         return 0;                      /* key matched OK in registry */
 396 }
 397
 398 void store_host_key(const char *hostname, int port,
 399                     const char *keytype, const char *key)
 400 {
 401     char *regname;
 402     HKEY rkey;
 403
 404     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 405
 406     hostkey_regname(regname, hostname, port, keytype);
 407
 408     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 409                      &rkey) != ERROR_SUCCESS)
 410         return;                        /* key does not exist in registry */
 411     RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 412     RegCloseKey(rkey);
 413 }
 414
 415 /*
 416  * Find the random seed file path and store it in `seedpath'.
 417  */
 418 static void get_seedpath(void)
 419 {
 420     HKEY rkey;
 421     DWORD type, size;
 422
 423     size = sizeof(seedpath);
 424
 425     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 426         ERROR_SUCCESS) {
 427         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 428                                   0, &type, seedpath, &size);
 429         if (ret != ERROR_SUCCESS || type != REG_SZ)
 430             seedpath[0] = '\0';
 431         RegCloseKey(rkey);
 432     } else
 433         seedpath[0] = '\0';
 434
 435     if (!seedpath[0]) {
 436         int len, ret;
 437
 438         len =
 439             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 440                                    sizeof(seedpath));
 441         ret =
 442             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 443                                    sizeof(seedpath) - len);
 444         if (ret == 0) {                /* probably win95; store in \WINDOWS */
 445             GetWindowsDirectory(seedpath, sizeof(seedpath));
 446             len = strlen(seedpath);
 447         } else
 448             len += ret;
 449         strcpy(seedpath + len, "\\PUTTY.RND");
 450     }
 451 }
 452
 453 void read_random_seed(noise_consumer_t consumer)
 454 {
 455     HANDLE seedf;
 456
 457     if (!seedpath[0])
 458         get_seedpath();
 459
 460     seedf = CreateFile(seedpath, GENERIC_READ,
 461                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 462                        NULL, OPEN_EXISTING, 0, NULL);
 463
 464     if (seedf != INVALID_HANDLE_VALUE) {
 465         while (1) {
 466             char buf[1024];
 467             DWORD len;
 468
 469             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 470                 consumer(buf, len);
 471             else
 472                 break;
 473         }
 474         CloseHandle(seedf);
 475     }
 476 }
 477
 478 void write_random_seed(void *data, int len)
 479 {
 480     HANDLE seedf;
 481
 482     if (!seedpath[0])
 483         get_seedpath();
 484
 485     seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
 486                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 487
 488     if (seedf != INVALID_HANDLE_VALUE) {
 489         DWORD lenwritten;
 490
 491         WriteFile(seedf, data, len, &lenwritten, NULL);
 492         CloseHandle(seedf);
 493     }
 494 }
 495
 496 /*
 497  * Recursively delete a registry key and everything under it.
 498  */
 499 static void registry_recursive_remove(HKEY key)
 500 {
 501     DWORD i;
 502     char name[MAX_PATH + 1];
 503     HKEY subkey;
 504
 505     i = 0;
 506     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 507         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 508             registry_recursive_remove(subkey);
 509             RegCloseKey(subkey);
 510         }
 511         RegDeleteKey(key, name);
 512     }
 513 }
 514
 515 void cleanup_all(void)
 516 {
 517     HKEY key;
 518     int ret;
 519     char name[MAX_PATH + 1];
 520
 521     /* ------------------------------------------------------------
 522      * Wipe out the random seed file.
 523      */
 524     if (!seedpath[0])
 525         get_seedpath();
 526     remove(seedpath);
 527
 528     /* ------------------------------------------------------------
 529      * Destroy all registry information associated with PuTTY.
 530      */
 531
 532     /*
 533      * Open the main PuTTY registry key and remove everything in it.
 534      */
 535     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 536         ERROR_SUCCESS) {
 537         registry_recursive_remove(key);
 538         RegCloseKey(key);
 539     }
 540     /*
 541      * Now open the parent key and remove the PuTTY main key. Once
 542      * we've done that, see if the parent key has any other
 543      * children.
 544      */
 545     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 546                    &key) == ERROR_SUCCESS) {
 547         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 548         ret = RegEnumKey(key, 0, name, sizeof(name));
 549         RegCloseKey(key);
 550         /*
 551          * If the parent key had no other children, we must delete
 552          * it in its turn. That means opening the _grandparent_
 553          * key.
 554          */
 555         if (ret != ERROR_SUCCESS) {
 556             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 557                            &key) == ERROR_SUCCESS) {
 558                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 559                 RegCloseKey(key);
 560             }
 561         }
 562     }
 563     /*
 564      * Now we're done.
 565      */
 566 }