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 <windows.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <limits.h>
  10 #include "putty.h"
  11 #include "storage.h"
  12
  13 static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
  14
  15 static char seedpath[2 * MAX_PATH + 10] = "\0";
  16
  17 static const char hex[16] = "0123456789ABCDEF";
  18
  19 static void mungestr(const char *in, char *out)
  20 {
  21     int candot = 0;
  22
  23     while (*in) {
  24         if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
  25             *in == '%' || *in < ' ' || *in > '~' || (*in == '.'
  26                                                      && !candot)) {
  27             *out++ = '%';
  28             *out++ = hex[((unsigned char) *in) >> 4];
  29             *out++ = hex[((unsigned char) *in) & 15];
  30         } else
  31             *out++ = *in;
  32         in++;
  33         candot = 1;
  34     }
  35     *out = '\0';
  36     return;
  37 }
  38
  39 static void unmungestr(const char *in, char *out, int outlen)
  40 {
  41     while (*in) {
  42         if (*in == '%' && in[1] && in[2]) {
  43             int i, j;
  44
  45             i = in[1] - '0';
  46             i -= (i > 9 ? 7 : 0);
  47             j = in[2] - '0';
  48             j -= (j > 9 ? 7 : 0);
  49
  50             *out++ = (i << 4) + j;
  51             if (!--outlen)
  52                 return;
  53             in += 3;
  54         } else {
  55             *out++ = *in++;
  56             if (!--outlen)
  57                 return;
  58         }
  59     }
  60     *out = '\0';
  61     return;
  62 }
  63
  64 void *open_settings_w(const char *sessionname)
  65 {
  66     HKEY subkey1, sesskey;
  67     int ret;
  68     char *p;
  69
  70     if (!sessionname || !*sessionname)
  71         sessionname = "Default Settings";
  72
  73     p = snewn(3 * strlen(sessionname) + 1, char);
  74     mungestr(sessionname, p);
  75
  76     ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
  77     if (ret != ERROR_SUCCESS) {
  78         sfree(p);
  79         return NULL;
  80     }
  81     ret = RegCreateKey(subkey1, p, &sesskey);
  82     sfree(p);
  83     RegCloseKey(subkey1);
  84     if (ret != ERROR_SUCCESS)
  85         return NULL;
  86     return (void *) sesskey;
  87 }
  88
  89 void write_setting_s(void *handle, const char *key, const char *value)
  90 {
  91     if (handle)
  92         RegSetValueEx((HKEY) handle, key, 0, REG_SZ, value,
  93                       1 + strlen(value));
  94 }
  95
  96 void write_setting_i(void *handle, const char *key, int value)
  97 {
  98     if (handle)
  99         RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
 100                       (CONST BYTE *) & value, sizeof(value));
 101 }
 102
 103 void close_settings_w(void *handle)
 104 {
 105     RegCloseKey((HKEY) handle);
 106 }
 107
 108 void *open_settings_r(const char *sessionname)
 109 {
 110     HKEY subkey1, sesskey;
 111     char *p;
 112
 113     if (!sessionname || !*sessionname)
 114         sessionname = "Default Settings";
 115
 116     p = snewn(3 * strlen(sessionname) + 1, char);
 117     mungestr(sessionname, p);
 118
 119     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 120         sesskey = NULL;
 121     } else {
 122         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 123             sesskey = NULL;
 124         }
 125         RegCloseKey(subkey1);
 126     }
 127
 128     sfree(p);
 129
 130     return (void *) sesskey;
 131 }
 132
 133 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 134 {
 135     DWORD type, size;
 136     size = buflen;
 137
 138     if (!handle ||
 139         RegQueryValueEx((HKEY) handle, key, 0,
 140                         &type, buffer, &size) != ERROR_SUCCESS ||
 141         type != REG_SZ) return NULL;
 142     else
 143         return buffer;
 144 }
 145
 146 int read_setting_i(void *handle, const char *key, int defvalue)
 147 {
 148     DWORD type, val, size;
 149     size = sizeof(val);
 150
 151     if (!handle ||
 152         RegQueryValueEx((HKEY) handle, key, 0, &type,
 153                         (BYTE *) & val, &size) != ERROR_SUCCESS ||
 154         size != sizeof(val) || type != REG_DWORD)
 155         return defvalue;
 156     else
 157         return val;
 158 }
 159
 160 int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
 161 {
 162     char *settingname;
 163     FontSpec ret;
 164
 165     if (!read_setting_s(handle, name, ret.name, sizeof(ret.name)))
 166         return 0;
 167     settingname = dupcat(name, "IsBold", NULL);
 168     ret.isbold = read_setting_i(handle, settingname, -1);
 169     sfree(settingname);
 170     if (ret.isbold == -1) return 0;
 171     settingname = dupcat(name, "CharSet", NULL);
 172     ret.charset = read_setting_i(handle, settingname, -1);
 173     sfree(settingname);
 174     if (ret.charset == -1) return 0;
 175     settingname = dupcat(name, "Height", NULL);
 176     ret.height = read_setting_i(handle, settingname, INT_MIN);
 177     sfree(settingname);
 178     if (ret.height == INT_MIN) return 0;
 179     if (ret.height < 0) {
 180         int oldh, newh;
 181         HDC hdc = GetDC(NULL);
 182         int logpix = GetDeviceCaps(hdc, LOGPIXELSY);
 183         ReleaseDC(NULL, hdc);
 184
 185         oldh = -ret.height;
 186         newh = MulDiv(oldh, 72, logpix) + 1;
 187         if (MulDiv(newh, logpix, 72) > oldh)
 188             newh--;
 189         ret.height = newh;
 190     }
 191     *result = ret;
 192     return 1;
 193 }
 194
 195 void write_setting_fontspec(void *handle, const char *name, FontSpec font)
 196 {
 197     char *settingname;
 198
 199     write_setting_s(handle, name, font.name);
 200     settingname = dupcat(name, "IsBold", NULL);
 201     write_setting_i(handle, settingname, font.isbold);
 202     sfree(settingname);
 203     settingname = dupcat(name, "CharSet", NULL);
 204     write_setting_i(handle, settingname, font.charset);
 205     sfree(settingname);
 206     settingname = dupcat(name, "Height", NULL);
 207     write_setting_i(handle, settingname, font.height);
 208     sfree(settingname);
 209 }
 210
 211 int read_setting_filename(void *handle, const char *name, Filename *result)
 212 {
 213     return !!read_setting_s(handle, name, result->path, sizeof(result->path));
 214 }
 215
 216 void write_setting_filename(void *handle, const char *name, Filename result)
 217 {
 218     write_setting_s(handle, name, result.path);
 219 }
 220
 221 void close_settings_r(void *handle)
 222 {
 223     RegCloseKey((HKEY) handle);
 224 }
 225
 226 void del_settings(const char *sessionname)
 227 {
 228     HKEY subkey1;
 229     char *p;
 230
 231     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
 232         return;
 233
 234     p = snewn(3 * strlen(sessionname) + 1, char);
 235     mungestr(sessionname, p);
 236     RegDeleteKey(subkey1, p);
 237     sfree(p);
 238
 239     RegCloseKey(subkey1);
 240 }
 241
 242 struct enumsettings {
 243     HKEY key;
 244     int i;
 245 };
 246
 247 void *enum_settings_start(void)
 248 {
 249     struct enumsettings *ret;
 250     HKEY key;
 251
 252     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
 253         return NULL;
 254
 255     ret = snew(struct enumsettings);
 256     if (ret) {
 257         ret->key = key;
 258         ret->i = 0;
 259     }
 260
 261     return ret;
 262 }
 263
 264 char *enum_settings_next(void *handle, char *buffer, int buflen)
 265 {
 266     struct enumsettings *e = (struct enumsettings *) handle;
 267     char *otherbuf;
 268     otherbuf = snewn(3 * buflen, char);
 269     if (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
 270         unmungestr(otherbuf, buffer, buflen);
 271         sfree(otherbuf);
 272         return buffer;
 273     } else {
 274         sfree(otherbuf);
 275         return NULL;
 276     }
 277 }
 278
 279 void enum_settings_finish(void *handle)
 280 {
 281     struct enumsettings *e = (struct enumsettings *) handle;
 282     RegCloseKey(e->key);
 283     sfree(e);
 284 }
 285
 286 static void hostkey_regname(char *buffer, const char *hostname,
 287                             int port, const char *keytype)
 288 {
 289     int len;
 290     strcpy(buffer, keytype);
 291     strcat(buffer, "@");
 292     len = strlen(buffer);
 293     len += sprintf(buffer + len, "%d:", port);
 294     mungestr(hostname, buffer + strlen(buffer));
 295 }
 296
 297 int verify_host_key(const char *hostname, int port,
 298                     const char *keytype, const char *key)
 299 {
 300     char *otherstr, *regname;
 301     int len;
 302     HKEY rkey;
 303     DWORD readlen;
 304     DWORD type;
 305     int ret, compare;
 306
 307     len = 1 + strlen(key);
 308
 309     /*
 310      * Now read a saved key in from the registry and see what it
 311      * says.
 312      */
 313     otherstr = snewn(len, char);
 314     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 315
 316     hostkey_regname(regname, hostname, port, keytype);
 317
 318     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 319                    &rkey) != ERROR_SUCCESS)
 320         return 1;                      /* key does not exist in registry */
 321
 322     readlen = len;
 323     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 324
 325     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 326         !strcmp(keytype, "rsa")) {
 327         /*
 328          * Key didn't exist. If the key type is RSA, we'll try
 329          * another trick, which is to look up the _old_ key format
 330          * under just the hostname and translate that.
 331          */
 332         char *justhost = regname + 1 + strcspn(regname, ":");
 333         char *oldstyle = snewn(len + 10, char); /* safety margin */
 334         readlen = len;
 335         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 336                               oldstyle, &readlen);
 337
 338         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 339             /*
 340              * The old format is two old-style bignums separated by
 341              * a slash. An old-style bignum is made of groups of
 342              * four hex digits: digits are ordered in sensible
 343              * (most to least significant) order within each group,
 344              * but groups are ordered in silly (least to most)
 345              * order within the bignum. The new format is two
 346              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 347              * A nonzero except in the special case 0x0, which
 348              * doesn't appear anyway in RSA keys) separated by a
 349              * comma. All hex digits are lowercase in both formats.
 350              */
 351             char *p = otherstr;
 352             char *q = oldstyle;
 353             int i, j;
 354
 355             for (i = 0; i < 2; i++) {
 356                 int ndigits, nwords;
 357                 *p++ = '0';
 358                 *p++ = 'x';
 359                 ndigits = strcspn(q, "/");      /* find / or end of string */
 360                 nwords = ndigits / 4;
 361                 /* now trim ndigits to remove leading zeros */
 362                 while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
 363                     ndigits--;
 364                 /* now move digits over to new string */
 365                 for (j = 0; j < ndigits; j++)
 366                     p[ndigits - 1 - j] = q[j ^ 3];
 367                 p += ndigits;
 368                 q += nwords * 4;
 369                 if (*q) {
 370                     q++;               /* eat the slash */
 371                     *p++ = ',';        /* add a comma */
 372                 }
 373                 *p = '\0';             /* terminate the string */
 374             }
 375
 376             /*
 377              * Now _if_ this key matches, we'll enter it in the new
 378              * format. If not, we'll assume something odd went
 379              * wrong, and hyper-cautiously do nothing.
 380              */
 381             if (!strcmp(otherstr, key))
 382                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 383                               strlen(otherstr) + 1);
 384         }
 385     }
 386
 387     RegCloseKey(rkey);
 388
 389     compare = strcmp(otherstr, key);
 390
 391     sfree(otherstr);
 392     sfree(regname);
 393
 394     if (ret == ERROR_MORE_DATA ||
 395         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 396         return 2;                      /* key is different in registry */
 397     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 398         return 1;                      /* key does not exist in registry */
 399     else
 400         return 0;                      /* key matched OK in registry */
 401 }
 402
 403 void store_host_key(const char *hostname, int port,
 404                     const char *keytype, const char *key)
 405 {
 406     char *regname;
 407     HKEY rkey;
 408
 409     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 410
 411     hostkey_regname(regname, hostname, port, keytype);
 412
 413     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 414                      &rkey) != ERROR_SUCCESS)
 415         return;                        /* key does not exist in registry */
 416     RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 417     RegCloseKey(rkey);
 418 }
 419
 420 /*
 421  * Find the random seed file path and store it in `seedpath'.
 422  */
 423 static void get_seedpath(void)
 424 {
 425     HKEY rkey;
 426     DWORD type, size;
 427
 428     size = sizeof(seedpath);
 429
 430     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 431         ERROR_SUCCESS) {
 432         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 433                                   0, &type, seedpath, &size);
 434         if (ret != ERROR_SUCCESS || type != REG_SZ)
 435             seedpath[0] = '\0';
 436         RegCloseKey(rkey);
 437     } else
 438         seedpath[0] = '\0';
 439
 440     if (!seedpath[0]) {
 441         int len, ret;
 442
 443         len =
 444             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 445                                    sizeof(seedpath));
 446         ret =
 447             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 448                                    sizeof(seedpath) - len);
 449         if (ret == 0) {                /* probably win95; store in \WINDOWS */
 450             GetWindowsDirectory(seedpath, sizeof(seedpath));
 451             len = strlen(seedpath);
 452         } else
 453             len += ret;
 454         strcpy(seedpath + len, "\\PUTTY.RND");
 455     }
 456 }
 457
 458 void read_random_seed(noise_consumer_t consumer)
 459 {
 460     HANDLE seedf;
 461
 462     if (!seedpath[0])
 463         get_seedpath();
 464
 465     seedf = CreateFile(seedpath, GENERIC_READ,
 466                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 467                        NULL, OPEN_EXISTING, 0, NULL);
 468
 469     if (seedf != INVALID_HANDLE_VALUE) {
 470         while (1) {
 471             char buf[1024];
 472             DWORD len;
 473
 474             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 475                 consumer(buf, len);
 476             else
 477                 break;
 478         }
 479         CloseHandle(seedf);
 480     }
 481 }
 482
 483 void write_random_seed(void *data, int len)
 484 {
 485     HANDLE seedf;
 486
 487     if (!seedpath[0])
 488         get_seedpath();
 489
 490     seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
 491                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 492
 493     if (seedf != INVALID_HANDLE_VALUE) {
 494         DWORD lenwritten;
 495
 496         WriteFile(seedf, data, len, &lenwritten, NULL);
 497         CloseHandle(seedf);
 498     }
 499 }
 500
 501 /*
 502  * Recursively delete a registry key and everything under it.
 503  */
 504 static void registry_recursive_remove(HKEY key)
 505 {
 506     DWORD i;
 507     char name[MAX_PATH + 1];
 508     HKEY subkey;
 509
 510     i = 0;
 511     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 512         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 513             registry_recursive_remove(subkey);
 514             RegCloseKey(subkey);
 515         }
 516         RegDeleteKey(key, name);
 517     }
 518 }
 519
 520 void cleanup_all(void)
 521 {
 522     HKEY key;
 523     int ret;
 524     char name[MAX_PATH + 1];
 525
 526     /* ------------------------------------------------------------
 527      * Wipe out the random seed file.
 528      */
 529     if (!seedpath[0])
 530         get_seedpath();
 531     remove(seedpath);
 532
 533     /* ------------------------------------------------------------
 534      * Destroy all registry information associated with PuTTY.
 535      */
 536
 537     /*
 538      * Open the main PuTTY registry key and remove everything in it.
 539      */
 540     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 541         ERROR_SUCCESS) {
 542         registry_recursive_remove(key);
 543         RegCloseKey(key);
 544     }
 545     /*
 546      * Now open the parent key and remove the PuTTY main key. Once
 547      * we've done that, see if the parent key has any other
 548      * children.
 549      */
 550     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 551                    &key) == ERROR_SUCCESS) {
 552         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 553         ret = RegEnumKey(key, 0, name, sizeof(name));
 554         RegCloseKey(key);
 555         /*
 556          * If the parent key had no other children, we must delete
 557          * it in its turn. That means opening the _grandparent_
 558          * key.
 559          */
 560         if (ret != ERROR_SUCCESS) {
 561             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 562                            &key) == ERROR_SUCCESS) {
 563                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 564                 RegCloseKey(key);
 565             }
 566         }
 567     }
 568     /*
 569      * Now we're done.
 570      */
 571 }