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 #include <shlobj.h>
  13 #ifndef CSIDL_APPDATA
  14 #define CSIDL_APPDATA 0x001a
  15 #endif
  16 #ifndef CSIDL_LOCAL_APPDATA
  17 #define CSIDL_LOCAL_APPDATA 0x001c
  18 #endif
  19
  20 static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
  21
  22 static const char hex[16] = "0123456789ABCDEF";
  23
  24 static int tried_shgetfolderpath = FALSE;
  25 static HMODULE shell32_module = NULL;
  26 DECL_WINDOWS_FUNCTION(static, HRESULT, SHGetFolderPathA,
  27                       (HWND, int, HANDLE, DWORD, LPSTR));
  28
  29 static void mungestr(const char *in, char *out)
  30 {
  31     int candot = 0;
  32
  33     while (*in) {
  34         if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
  35             *in == '%' || *in < ' ' || *in > '~' || (*in == '.'
  36                                                      && !candot)) {
  37             *out++ = '%';
  38             *out++ = hex[((unsigned char) *in) >> 4];
  39             *out++ = hex[((unsigned char) *in) & 15];
  40         } else
  41             *out++ = *in;
  42         in++;
  43         candot = 1;
  44     }
  45     *out = '\0';
  46     return;
  47 }
  48
  49 static void unmungestr(const char *in, char *out, int outlen)
  50 {
  51     while (*in) {
  52         if (*in == '%' && in[1] && in[2]) {
  53             int i, j;
  54
  55             i = in[1] - '0';
  56             i -= (i > 9 ? 7 : 0);
  57             j = in[2] - '0';
  58             j -= (j > 9 ? 7 : 0);
  59
  60             *out++ = (i << 4) + j;
  61             if (!--outlen)
  62                 return;
  63             in += 3;
  64         } else {
  65             *out++ = *in++;
  66             if (!--outlen)
  67                 return;
  68         }
  69     }
  70     *out = '\0';
  71     return;
  72 }
  73
  74 void *open_settings_w(const char *sessionname, char **errmsg)
  75 {
  76     HKEY subkey1, sesskey;
  77     int ret;
  78     char *p;
  79
  80     *errmsg = NULL;
  81
  82     if (!sessionname || !*sessionname)
  83         sessionname = "Default Settings";
  84
  85     p = snewn(3 * strlen(sessionname) + 1, char);
  86     mungestr(sessionname, p);
  87
  88     ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
  89     if (ret != ERROR_SUCCESS) {
  90         sfree(p);
  91         *errmsg = dupprintf("Unable to create registry key\n"
  92                             "HKEY_CURRENT_USER\\%s", puttystr);
  93         return NULL;
  94     }
  95     ret = RegCreateKey(subkey1, p, &sesskey);
  96     RegCloseKey(subkey1);
  97     if (ret != ERROR_SUCCESS) {
  98         *errmsg = dupprintf("Unable to create registry key\n"
  99                             "HKEY_CURRENT_USER\\%s\\%s", puttystr, p);
 100         sfree(p);
 101         return NULL;
 102     }
 103     sfree(p);
 104     return (void *) sesskey;
 105 }
 106
 107 void write_setting_s(void *handle, const char *key, const char *value)
 108 {
 109     if (handle)
 110         RegSetValueEx((HKEY) handle, key, 0, REG_SZ, value,
 111                       1 + strlen(value));
 112 }
 113
 114 void write_setting_i(void *handle, const char *key, int value)
 115 {
 116     if (handle)
 117         RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
 118                       (CONST BYTE *) &value, sizeof(value));
 119 }
 120
 121 void close_settings_w(void *handle)
 122 {
 123     RegCloseKey((HKEY) handle);
 124 }
 125
 126 void *open_settings_r(const char *sessionname)
 127 {
 128     HKEY subkey1, sesskey;
 129     char *p;
 130
 131     if (!sessionname || !*sessionname)
 132         sessionname = "Default Settings";
 133
 134     p = snewn(3 * strlen(sessionname) + 1, char);
 135     mungestr(sessionname, p);
 136
 137     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 138         sesskey = NULL;
 139     } else {
 140         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 141             sesskey = NULL;
 142         }
 143         RegCloseKey(subkey1);
 144     }
 145
 146     sfree(p);
 147
 148     return (void *) sesskey;
 149 }
 150
 151 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 152 {
 153     DWORD type, size;
 154     size = buflen;
 155
 156     if (!handle ||
 157         RegQueryValueEx((HKEY) handle, key, 0,
 158                         &type, buffer, &size) != ERROR_SUCCESS ||
 159         type != REG_SZ) return NULL;
 160     else
 161         return buffer;
 162 }
 163
 164 int read_setting_i(void *handle, const char *key, int defvalue)
 165 {
 166     DWORD type, val, size;
 167     size = sizeof(val);
 168
 169     if (!handle ||
 170         RegQueryValueEx((HKEY) handle, key, 0, &type,
 171                         (BYTE *) &val, &size) != ERROR_SUCCESS ||
 172         size != sizeof(val) || type != REG_DWORD)
 173         return defvalue;
 174     else
 175         return val;
 176 }
 177
 178 int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
 179 {
 180     char *settingname;
 181     FontSpec ret;
 182
 183     if (!read_setting_s(handle, name, ret.name, sizeof(ret.name)))
 184         return 0;
 185     settingname = dupcat(name, "IsBold", NULL);
 186     ret.isbold = read_setting_i(handle, settingname, -1);
 187     sfree(settingname);
 188     if (ret.isbold == -1) return 0;
 189     settingname = dupcat(name, "CharSet", NULL);
 190     ret.charset = read_setting_i(handle, settingname, -1);
 191     sfree(settingname);
 192     if (ret.charset == -1) return 0;
 193     settingname = dupcat(name, "Height", NULL);
 194     ret.height = read_setting_i(handle, settingname, INT_MIN);
 195     sfree(settingname);
 196     if (ret.height == INT_MIN) return 0;
 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         RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 422         RegCloseKey(rkey);
 423     } /* else key does not exist in registry */
 424
 425     sfree(regname);
 426 }
 427
 428 /*
 429  * Open (or delete) the random seed file.
 430  */
 431 enum { DEL, OPEN_R, OPEN_W };
 432 static int try_random_seed(char const *path, int action, HANDLE *ret)
 433 {
 434     if (action == DEL) {
 435         remove(path);
 436         *ret = INVALID_HANDLE_VALUE;
 437         return FALSE;                  /* so we'll do the next ones too */
 438     }
 439
 440     *ret = CreateFile(path,
 441                       action == OPEN_W ? GENERIC_WRITE : GENERIC_READ,
 442                       action == OPEN_W ? 0 : (FILE_SHARE_READ |
 443                                               FILE_SHARE_WRITE),
 444                       NULL,
 445                       action == OPEN_W ? CREATE_ALWAYS : OPEN_EXISTING,
 446                       action == OPEN_W ? FILE_ATTRIBUTE_NORMAL : 0,
 447                       NULL);
 448
 449     return (*ret != INVALID_HANDLE_VALUE);
 450 }
 451
 452 static HANDLE access_random_seed(int action)
 453 {
 454     HKEY rkey;
 455     DWORD type, size;
 456     HANDLE rethandle;
 457     char seedpath[2 * MAX_PATH + 10] = "\0";
 458
 459     /*
 460      * Iterate over a selection of possible random seed paths until
 461      * we find one that works.
 462      *
 463      * We do this iteration separately for reading and writing,
 464      * meaning that we will automatically migrate random seed files
 465      * if a better location becomes available (by reading from the
 466      * best location in which we actually find one, and then
 467      * writing to the best location in which we can _create_ one).
 468      */
 469
 470     /*
 471      * First, try the location specified by the user in the
 472      * Registry, if any.
 473      */
 474     size = sizeof(seedpath);
 475     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 476         ERROR_SUCCESS) {
 477         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 478                                   0, &type, seedpath, &size);
 479         if (ret != ERROR_SUCCESS || type != REG_SZ)
 480             seedpath[0] = '\0';
 481         RegCloseKey(rkey);
 482
 483         if (*seedpath && try_random_seed(seedpath, action, &rethandle))
 484             return rethandle;
 485     }
 486
 487     /*
 488      * Next, try the user's local Application Data directory,
 489      * followed by their non-local one. This is found using the
 490      * SHGetFolderPath function, which won't be present on all
 491      * versions of Windows.
 492      */
 493     if (!tried_shgetfolderpath) {
 494         /* This is likely only to bear fruit on systems with IE5+
 495          * installed, or WinMe/2K+. There is some faffing with
 496          * SHFOLDER.DLL we could do to try to find an equivalent
 497          * on older versions of Windows if we cared enough.
 498          * However, the invocation below requires IE5+ anyway,
 499          * so stuff that. */
 500         shell32_module = LoadLibrary("SHELL32.DLL");
 501         GET_WINDOWS_FUNCTION(shell32_module, SHGetFolderPathA);
 502     }
 503     if (p_SHGetFolderPathA) {
 504         if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_LOCAL_APPDATA,
 505                                          NULL, SHGFP_TYPE_CURRENT, seedpath))) {
 506             strcat(seedpath, "\\PUTTY.RND");
 507             if (try_random_seed(seedpath, action, &rethandle))
 508                 return rethandle;
 509         }
 510
 511         if (SUCCEEDED(p_SHGetFolderPathA(NULL, CSIDL_APPDATA,
 512                                          NULL, SHGFP_TYPE_CURRENT, seedpath))) {
 513             strcat(seedpath, "\\PUTTY.RND");
 514             if (try_random_seed(seedpath, action, &rethandle))
 515                 return rethandle;
 516         }
 517     }
 518
 519     /*
 520      * Failing that, try %HOMEDRIVE%%HOMEPATH% as a guess at the
 521      * user's home directory.
 522      */
 523     {
 524         int len, ret;
 525
 526         len =
 527             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 528                                    sizeof(seedpath));
 529         ret =
 530             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 531                                    sizeof(seedpath) - len);
 532         if (ret != 0) {
 533             strcat(seedpath, "\\PUTTY.RND");
 534             if (try_random_seed(seedpath, action, &rethandle))
 535                 return rethandle;
 536         }
 537     }
 538
 539     /*
 540      * And finally, fall back to C:\WINDOWS.
 541      */
 542     GetWindowsDirectory(seedpath, sizeof(seedpath));
 543     strcat(seedpath, "\\PUTTY.RND");
 544     if (try_random_seed(seedpath, action, &rethandle))
 545         return rethandle;
 546
 547     /*
 548      * If even that failed, give up.
 549      */
 550     return INVALID_HANDLE_VALUE;
 551 }
 552
 553 void read_random_seed(noise_consumer_t consumer)
 554 {
 555     HANDLE seedf = access_random_seed(OPEN_R);
 556
 557     if (seedf != INVALID_HANDLE_VALUE) {
 558         while (1) {
 559             char buf[1024];
 560             DWORD len;
 561
 562             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 563                 consumer(buf, len);
 564             else
 565                 break;
 566         }
 567         CloseHandle(seedf);
 568     }
 569 }
 570
 571 void write_random_seed(void *data, int len)
 572 {
 573     HANDLE seedf = access_random_seed(OPEN_W);
 574
 575     if (seedf != INVALID_HANDLE_VALUE) {
 576         DWORD lenwritten;
 577
 578         WriteFile(seedf, data, len, &lenwritten, NULL);
 579         CloseHandle(seedf);
 580     }
 581 }
 582
 583 /*
 584  * Recursively delete a registry key and everything under it.
 585  */
 586 static void registry_recursive_remove(HKEY key)
 587 {
 588     DWORD i;
 589     char name[MAX_PATH + 1];
 590     HKEY subkey;
 591
 592     i = 0;
 593     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 594         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 595             registry_recursive_remove(subkey);
 596             RegCloseKey(subkey);
 597         }
 598         RegDeleteKey(key, name);
 599     }
 600 }
 601
 602 void cleanup_all(void)
 603 {
 604     HKEY key;
 605     int ret;
 606     char name[MAX_PATH + 1];
 607
 608     /* ------------------------------------------------------------
 609      * Wipe out the random seed file, in all of its possible
 610      * locations.
 611      */
 612     access_random_seed(DEL);
 613
 614     /* ------------------------------------------------------------
 615      * Destroy all registry information associated with PuTTY.
 616      */
 617
 618     /*
 619      * Open the main PuTTY registry key and remove everything in it.
 620      */
 621     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 622         ERROR_SUCCESS) {
 623         registry_recursive_remove(key);
 624         RegCloseKey(key);
 625     }
 626     /*
 627      * Now open the parent key and remove the PuTTY main key. Once
 628      * we've done that, see if the parent key has any other
 629      * children.
 630      */
 631     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 632                    &key) == ERROR_SUCCESS) {
 633         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 634         ret = RegEnumKey(key, 0, name, sizeof(name));
 635         RegCloseKey(key);
 636         /*
 637          * If the parent key had no other children, we must delete
 638          * it in its turn. That means opening the _grandparent_
 639          * key.
 640          */
 641         if (ret != ERROR_SUCCESS) {
 642             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 643                            &key) == ERROR_SUCCESS) {
 644                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 645                 RegCloseKey(key);
 646             }
 647         }
 648     }
 649     /*
 650      * Now we're done.
 651      */
 652 }