git.distorted.org.uk Git - u/mdw/putty/blob - 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     sfree(p);
  86     RegCloseKey(subkey1);
  87     if (ret != ERROR_SUCCESS) {
  88         *errmsg = dupprintf("Unable to create registry key\n"
  89                             "HKEY_CURRENT_USER%s\\%s", puttystr, p);
  90         return NULL;
  91     }
  92     return (void *) sesskey;
  93 }
  94
  95 void write_setting_s(void *handle, const char *key, const char *value)
  96 {
  97     if (handle)
  98         RegSetValueEx((HKEY) handle, key, 0, REG_SZ, value,
  99                       1 + strlen(value));
 100 }
 101
 102 void write_setting_i(void *handle, const char *key, int value)
 103 {
 104     if (handle)
 105         RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
 106                       (CONST BYTE *) & value, sizeof(value));
 107 }
 108
 109 void close_settings_w(void *handle)
 110 {
 111     RegCloseKey((HKEY) handle);
 112 }
 113
 114 void *open_settings_r(const char *sessionname)
 115 {
 116     HKEY subkey1, sesskey;
 117     char *p;
 118
 119     if (!sessionname || !*sessionname)
 120         sessionname = "Default Settings";
 121
 122     p = snewn(3 * strlen(sessionname) + 1, char);
 123     mungestr(sessionname, p);
 124
 125     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 126         sesskey = NULL;
 127     } else {
 128         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 129             sesskey = NULL;
 130         }
 131         RegCloseKey(subkey1);
 132     }
 133
 134     sfree(p);
 135
 136     return (void *) sesskey;
 137 }
 138
 139 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 140 {
 141     DWORD type, size;
 142     size = buflen;
 143
 144     if (!handle ||
 145         RegQueryValueEx((HKEY) handle, key, 0,
 146                         &type, buffer, &size) != ERROR_SUCCESS ||
 147         type != REG_SZ) return NULL;
 148     else
 149         return buffer;
 150 }
 151
 152 int read_setting_i(void *handle, const char *key, int defvalue)
 153 {
 154     DWORD type, val, size;
 155     size = sizeof(val);
 156
 157     if (!handle ||
 158         RegQueryValueEx((HKEY) handle, key, 0, &type,
 159                         (BYTE *) & val, &size) != ERROR_SUCCESS ||
 160         size != sizeof(val) || type != REG_DWORD)
 161         return defvalue;
 162     else
 163         return val;
 164 }
 165
 166 int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
 167 {
 168     char *settingname;
 169     FontSpec ret;
 170
 171     if (!read_setting_s(handle, name, ret.name, sizeof(ret.name)))
 172         return 0;
 173     settingname = dupcat(name, "IsBold", NULL);
 174     ret.isbold = read_setting_i(handle, settingname, -1);
 175     sfree(settingname);
 176     if (ret.isbold == -1) return 0;
 177     settingname = dupcat(name, "CharSet", NULL);
 178     ret.charset = read_setting_i(handle, settingname, -1);
 179     sfree(settingname);
 180     if (ret.charset == -1) return 0;
 181     settingname = dupcat(name, "Height", NULL);
 182     ret.height = read_setting_i(handle, settingname, INT_MIN);
 183     sfree(settingname);
 184     if (ret.height == INT_MIN) return 0;
 185     if (ret.height < 0) {
 186         int oldh, newh;
 187         HDC hdc = GetDC(NULL);
 188         int logpix = GetDeviceCaps(hdc, LOGPIXELSY);
 189         ReleaseDC(NULL, hdc);
 190
 191         oldh = -ret.height;
 192         newh = MulDiv(oldh, 72, logpix) + 1;
 193         if (MulDiv(newh, logpix, 72) > oldh)
 194             newh--;
 195         ret.height = newh;
 196     }
 197     *result = ret;
 198     return 1;
 199 }
 200
 201 void write_setting_fontspec(void *handle, const char *name, FontSpec font)
 202 {
 203     char *settingname;
 204
 205     write_setting_s(handle, name, font.name);
 206     settingname = dupcat(name, "IsBold", NULL);
 207     write_setting_i(handle, settingname, font.isbold);
 208     sfree(settingname);
 209     settingname = dupcat(name, "CharSet", NULL);
 210     write_setting_i(handle, settingname, font.charset);
 211     sfree(settingname);
 212     settingname = dupcat(name, "Height", NULL);
 213     write_setting_i(handle, settingname, font.height);
 214     sfree(settingname);
 215 }
 216
 217 int read_setting_filename(void *handle, const char *name, Filename *result)
 218 {
 219     return !!read_setting_s(handle, name, result->path, sizeof(result->path));
 220 }
 221
 222 void write_setting_filename(void *handle, const char *name, Filename result)
 223 {
 224     write_setting_s(handle, name, result.path);
 225 }
 226
 227 void close_settings_r(void *handle)
 228 {
 229     RegCloseKey((HKEY) handle);
 230 }
 231
 232 void del_settings(const char *sessionname)
 233 {
 234     HKEY subkey1;
 235     char *p;
 236
 237     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
 238         return;
 239
 240     p = snewn(3 * strlen(sessionname) + 1, char);
 241     mungestr(sessionname, p);
 242     RegDeleteKey(subkey1, p);
 243     sfree(p);
 244
 245     RegCloseKey(subkey1);
 246 }
 247
 248 struct enumsettings {
 249     HKEY key;
 250     int i;
 251 };
 252
 253 void *enum_settings_start(void)
 254 {
 255     struct enumsettings *ret;
 256     HKEY key;
 257
 258     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
 259         return NULL;
 260
 261     ret = snew(struct enumsettings);
 262     if (ret) {
 263         ret->key = key;
 264         ret->i = 0;
 265     }
 266
 267     return ret;
 268 }
 269
 270 char *enum_settings_next(void *handle, char *buffer, int buflen)
 271 {
 272     struct enumsettings *e = (struct enumsettings *) handle;
 273     char *otherbuf;
 274     otherbuf = snewn(3 * buflen, char);
 275     if (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
 276         unmungestr(otherbuf, buffer, buflen);
 277         sfree(otherbuf);
 278         return buffer;
 279     } else {
 280         sfree(otherbuf);
 281         return NULL;
 282     }
 283 }
 284
 285 void enum_settings_finish(void *handle)
 286 {
 287     struct enumsettings *e = (struct enumsettings *) handle;
 288     RegCloseKey(e->key);
 289     sfree(e);
 290 }
 291
 292 static void hostkey_regname(char *buffer, const char *hostname,
 293                             int port, const char *keytype)
 294 {
 295     int len;
 296     strcpy(buffer, keytype);
 297     strcat(buffer, "@");
 298     len = strlen(buffer);
 299     len += sprintf(buffer + len, "%d:", port);
 300     mungestr(hostname, buffer + strlen(buffer));
 301 }
 302
 303 int verify_host_key(const char *hostname, int port,
 304                     const char *keytype, const char *key)
 305 {
 306     char *otherstr, *regname;
 307     int len;
 308     HKEY rkey;
 309     DWORD readlen;
 310     DWORD type;
 311     int ret, compare;
 312
 313     len = 1 + strlen(key);
 314
 315     /*
 316      * Now read a saved key in from the registry and see what it
 317      * says.
 318      */
 319     otherstr = snewn(len, char);
 320     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 321
 322     hostkey_regname(regname, hostname, port, keytype);
 323
 324     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 325                    &rkey) != ERROR_SUCCESS)
 326         return 1;                      /* key does not exist in registry */
 327
 328     readlen = len;
 329     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 330
 331     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 332         !strcmp(keytype, "rsa")) {
 333         /*
 334          * Key didn't exist. If the key type is RSA, we'll try
 335          * another trick, which is to look up the _old_ key format
 336          * under just the hostname and translate that.
 337          */
 338         char *justhost = regname + 1 + strcspn(regname, ":");
 339         char *oldstyle = snewn(len + 10, char); /* safety margin */
 340         readlen = len;
 341         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 342                               oldstyle, &readlen);
 343
 344         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 345             /*
 346              * The old format is two old-style bignums separated by
 347              * a slash. An old-style bignum is made of groups of
 348              * four hex digits: digits are ordered in sensible
 349              * (most to least significant) order within each group,
 350              * but groups are ordered in silly (least to most)
 351              * order within the bignum. The new format is two
 352              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 353              * A nonzero except in the special case 0x0, which
 354              * doesn't appear anyway in RSA keys) separated by a
 355              * comma. All hex digits are lowercase in both formats.
 356              */
 357             char *p = otherstr;
 358             char *q = oldstyle;
 359             int i, j;
 360
 361             for (i = 0; i < 2; i++) {
 362                 int ndigits, nwords;
 363                 *p++ = '0';
 364                 *p++ = 'x';
 365                 ndigits = strcspn(q, "/");      /* find / or end of string */
 366                 nwords = ndigits / 4;
 367                 /* now trim ndigits to remove leading zeros */
 368                 while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
 369                     ndigits--;
 370                 /* now move digits over to new string */
 371                 for (j = 0; j < ndigits; j++)
 372                     p[ndigits - 1 - j] = q[j ^ 3];
 373                 p += ndigits;
 374                 q += nwords * 4;
 375                 if (*q) {
 376                     q++;               /* eat the slash */
 377                     *p++ = ',';        /* add a comma */
 378                 }
 379                 *p = '\0';             /* terminate the string */
 380             }
 381
 382             /*
 383              * Now _if_ this key matches, we'll enter it in the new
 384              * format. If not, we'll assume something odd went
 385              * wrong, and hyper-cautiously do nothing.
 386              */
 387             if (!strcmp(otherstr, key))
 388                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 389                               strlen(otherstr) + 1);
 390         }
 391     }
 392
 393     RegCloseKey(rkey);
 394
 395     compare = strcmp(otherstr, key);
 396
 397     sfree(otherstr);
 398     sfree(regname);
 399
 400     if (ret == ERROR_MORE_DATA ||
 401         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 402         return 2;                      /* key is different in registry */
 403     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 404         return 1;                      /* key does not exist in registry */
 405     else
 406         return 0;                      /* key matched OK in registry */
 407 }
 408
 409 void store_host_key(const char *hostname, int port,
 410                     const char *keytype, const char *key)
 411 {
 412     char *regname;
 413     HKEY rkey;
 414
 415     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 416
 417     hostkey_regname(regname, hostname, port, keytype);
 418
 419     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 420                      &rkey) != ERROR_SUCCESS)
 421         return;                        /* key does not exist in registry */
 422     RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 423     RegCloseKey(rkey);
 424 }
 425
 426 /*
 427  * Find the random seed file path and store it in `seedpath'.
 428  */
 429 static void get_seedpath(void)
 430 {
 431     HKEY rkey;
 432     DWORD type, size;
 433
 434     size = sizeof(seedpath);
 435
 436     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 437         ERROR_SUCCESS) {
 438         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 439                                   0, &type, seedpath, &size);
 440         if (ret != ERROR_SUCCESS || type != REG_SZ)
 441             seedpath[0] = '\0';
 442         RegCloseKey(rkey);
 443     } else
 444         seedpath[0] = '\0';
 445
 446     if (!seedpath[0]) {
 447         int len, ret;
 448
 449         len =
 450             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 451                                    sizeof(seedpath));
 452         ret =
 453             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 454                                    sizeof(seedpath) - len);
 455         if (ret == 0) {                /* probably win95; store in \WINDOWS */
 456             GetWindowsDirectory(seedpath, sizeof(seedpath));
 457             len = strlen(seedpath);
 458         } else
 459             len += ret;
 460         strcpy(seedpath + len, "\\PUTTY.RND");
 461     }
 462 }
 463
 464 void read_random_seed(noise_consumer_t consumer)
 465 {
 466     HANDLE seedf;
 467
 468     if (!seedpath[0])
 469         get_seedpath();
 470
 471     seedf = CreateFile(seedpath, GENERIC_READ,
 472                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 473                        NULL, OPEN_EXISTING, 0, NULL);
 474
 475     if (seedf != INVALID_HANDLE_VALUE) {
 476         while (1) {
 477             char buf[1024];
 478             DWORD len;
 479
 480             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 481                 consumer(buf, len);
 482             else
 483                 break;
 484         }
 485         CloseHandle(seedf);
 486     }
 487 }
 488
 489 void write_random_seed(void *data, int len)
 490 {
 491     HANDLE seedf;
 492
 493     if (!seedpath[0])
 494         get_seedpath();
 495
 496     seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
 497                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 498
 499     if (seedf != INVALID_HANDLE_VALUE) {
 500         DWORD lenwritten;
 501
 502         WriteFile(seedf, data, len, &lenwritten, NULL);
 503         CloseHandle(seedf);
 504     }
 505 }
 506
 507 /*
 508  * Recursively delete a registry key and everything under it.
 509  */
 510 static void registry_recursive_remove(HKEY key)
 511 {
 512     DWORD i;
 513     char name[MAX_PATH + 1];
 514     HKEY subkey;
 515
 516     i = 0;
 517     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 518         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 519             registry_recursive_remove(subkey);
 520             RegCloseKey(subkey);
 521         }
 522         RegDeleteKey(key, name);
 523     }
 524 }
 525
 526 void cleanup_all(void)
 527 {
 528     HKEY key;
 529     int ret;
 530     char name[MAX_PATH + 1];
 531
 532     /* ------------------------------------------------------------
 533      * Wipe out the random seed file.
 534      */
 535     if (!seedpath[0])
 536         get_seedpath();
 537     remove(seedpath);
 538
 539     /* ------------------------------------------------------------
 540      * Destroy all registry information associated with PuTTY.
 541      */
 542
 543     /*
 544      * Open the main PuTTY registry key and remove everything in it.
 545      */
 546     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 547         ERROR_SUCCESS) {
 548         registry_recursive_remove(key);
 549         RegCloseKey(key);
 550     }
 551     /*
 552      * Now open the parent key and remove the PuTTY main key. Once
 553      * we've done that, see if the parent key has any other
 554      * children.
 555      */
 556     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 557                    &key) == ERROR_SUCCESS) {
 558         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 559         ret = RegEnumKey(key, 0, name, sizeof(name));
 560         RegCloseKey(key);
 561         /*
 562          * If the parent key had no other children, we must delete
 563          * it in its turn. That means opening the _grandparent_
 564          * key.
 565          */
 566         if (ret != ERROR_SUCCESS) {
 567             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 568                            &key) == ERROR_SUCCESS) {
 569                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 570                 RegCloseKey(key);
 571             }
 572         }
 573     }
 574     /*
 575      * Now we're done.
 576      */
 577 }