git.distorted.org.uk Git - u/mdw/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 typedef HRESULT (WINAPI *p_SHGetFolderPath_t)
  27     (HWND, int, HANDLE, DWORD, LPTSTR);
  28 static p_SHGetFolderPath_t p_SHGetFolderPath = NULL;
  29
  30 static void mungestr(const char *in, char *out)
  31 {
  32     int candot = 0;
  33
  34     while (*in) {
  35         if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
  36             *in == '%' || *in < ' ' || *in > '~' || (*in == '.'
  37                                                      && !candot)) {
  38             *out++ = '%';
  39             *out++ = hex[((unsigned char) *in) >> 4];
  40             *out++ = hex[((unsigned char) *in) & 15];
  41         } else
  42             *out++ = *in;
  43         in++;
  44         candot = 1;
  45     }
  46     *out = '\0';
  47     return;
  48 }
  49
  50 static void unmungestr(const char *in, char *out, int outlen)
  51 {
  52     while (*in) {
  53         if (*in == '%' && in[1] && in[2]) {
  54             int i, j;
  55
  56             i = in[1] - '0';
  57             i -= (i > 9 ? 7 : 0);
  58             j = in[2] - '0';
  59             j -= (j > 9 ? 7 : 0);
  60
  61             *out++ = (i << 4) + j;
  62             if (!--outlen)
  63                 return;
  64             in += 3;
  65         } else {
  66             *out++ = *in++;
  67             if (!--outlen)
  68                 return;
  69         }
  70     }
  71     *out = '\0';
  72     return;
  73 }
  74
  75 void *open_settings_w(const char *sessionname, char **errmsg)
  76 {
  77     HKEY subkey1, sesskey;
  78     int ret;
  79     char *p;
  80
  81     *errmsg = NULL;
  82
  83     if (!sessionname || !*sessionname)
  84         sessionname = "Default Settings";
  85
  86     p = snewn(3 * strlen(sessionname) + 1, char);
  87     mungestr(sessionname, p);
  88
  89     ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
  90     if (ret != ERROR_SUCCESS) {
  91         sfree(p);
  92         *errmsg = dupprintf("Unable to create registry key\n"
  93                             "HKEY_CURRENT_USER\\%s", puttystr);
  94         return NULL;
  95     }
  96     ret = RegCreateKey(subkey1, p, &sesskey);
  97     RegCloseKey(subkey1);
  98     if (ret != ERROR_SUCCESS) {
  99         *errmsg = dupprintf("Unable to create registry key\n"
 100                             "HKEY_CURRENT_USER\\%s\\%s", puttystr, p);
 101         sfree(p);
 102         return NULL;
 103     }
 104     sfree(p);
 105     return (void *) sesskey;
 106 }
 107
 108 void write_setting_s(void *handle, const char *key, const char *value)
 109 {
 110     if (handle)
 111         RegSetValueEx((HKEY) handle, key, 0, REG_SZ, value,
 112                       1 + strlen(value));
 113 }
 114
 115 void write_setting_i(void *handle, const char *key, int value)
 116 {
 117     if (handle)
 118         RegSetValueEx((HKEY) handle, key, 0, REG_DWORD,
 119                       (CONST BYTE *) &value, sizeof(value));
 120 }
 121
 122 void close_settings_w(void *handle)
 123 {
 124     RegCloseKey((HKEY) handle);
 125 }
 126
 127 void *open_settings_r(const char *sessionname)
 128 {
 129     HKEY subkey1, sesskey;
 130     char *p;
 131
 132     if (!sessionname || !*sessionname)
 133         sessionname = "Default Settings";
 134
 135     p = snewn(3 * strlen(sessionname) + 1, char);
 136     mungestr(sessionname, p);
 137
 138     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 139         sesskey = NULL;
 140     } else {
 141         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 142             sesskey = NULL;
 143         }
 144         RegCloseKey(subkey1);
 145     }
 146
 147     sfree(p);
 148
 149     return (void *) sesskey;
 150 }
 151
 152 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 153 {
 154     DWORD type, size;
 155     size = buflen;
 156
 157     if (!handle ||
 158         RegQueryValueEx((HKEY) handle, key, 0,
 159                         &type, buffer, &size) != ERROR_SUCCESS ||
 160         type != REG_SZ) return NULL;
 161     else
 162         return buffer;
 163 }
 164
 165 int read_setting_i(void *handle, const char *key, int defvalue)
 166 {
 167     DWORD type, val, size;
 168     size = sizeof(val);
 169
 170     if (!handle ||
 171         RegQueryValueEx((HKEY) handle, key, 0, &type,
 172                         (BYTE *) &val, &size) != ERROR_SUCCESS ||
 173         size != sizeof(val) || type != REG_DWORD)
 174         return defvalue;
 175     else
 176         return val;
 177 }
 178
 179 int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
 180 {
 181     char *settingname;
 182     FontSpec ret;
 183
 184     if (!read_setting_s(handle, name, ret.name, sizeof(ret.name)))
 185         return 0;
 186     settingname = dupcat(name, "IsBold", NULL);
 187     ret.isbold = read_setting_i(handle, settingname, -1);
 188     sfree(settingname);
 189     if (ret.isbold == -1) return 0;
 190     settingname = dupcat(name, "CharSet", NULL);
 191     ret.charset = read_setting_i(handle, settingname, -1);
 192     sfree(settingname);
 193     if (ret.charset == -1) return 0;
 194     settingname = dupcat(name, "Height", NULL);
 195     ret.height = read_setting_i(handle, settingname, INT_MIN);
 196     sfree(settingname);
 197     if (ret.height == INT_MIN) return 0;
 198     *result = ret;
 199     return 1;
 200 }
 201
 202 void write_setting_fontspec(void *handle, const char *name, FontSpec font)
 203 {
 204     char *settingname;
 205
 206     write_setting_s(handle, name, font.name);
 207     settingname = dupcat(name, "IsBold", NULL);
 208     write_setting_i(handle, settingname, font.isbold);
 209     sfree(settingname);
 210     settingname = dupcat(name, "CharSet", NULL);
 211     write_setting_i(handle, settingname, font.charset);
 212     sfree(settingname);
 213     settingname = dupcat(name, "Height", NULL);
 214     write_setting_i(handle, settingname, font.height);
 215     sfree(settingname);
 216 }
 217
 218 int read_setting_filename(void *handle, const char *name, Filename *result)
 219 {
 220     return !!read_setting_s(handle, name, result->path, sizeof(result->path));
 221 }
 222
 223 void write_setting_filename(void *handle, const char *name, Filename result)
 224 {
 225     write_setting_s(handle, name, result.path);
 226 }
 227
 228 void close_settings_r(void *handle)
 229 {
 230     RegCloseKey((HKEY) handle);
 231 }
 232
 233 void del_settings(const char *sessionname)
 234 {
 235     HKEY subkey1;
 236     char *p;
 237
 238     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
 239         return;
 240
 241     p = snewn(3 * strlen(sessionname) + 1, char);
 242     mungestr(sessionname, p);
 243     RegDeleteKey(subkey1, p);
 244     sfree(p);
 245
 246     RegCloseKey(subkey1);
 247 }
 248
 249 struct enumsettings {
 250     HKEY key;
 251     int i;
 252 };
 253
 254 void *enum_settings_start(void)
 255 {
 256     struct enumsettings *ret;
 257     HKEY key;
 258
 259     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
 260         return NULL;
 261
 262     ret = snew(struct enumsettings);
 263     if (ret) {
 264         ret->key = key;
 265         ret->i = 0;
 266     }
 267
 268     return ret;
 269 }
 270
 271 char *enum_settings_next(void *handle, char *buffer, int buflen)
 272 {
 273     struct enumsettings *e = (struct enumsettings *) handle;
 274     char *otherbuf;
 275     otherbuf = snewn(3 * buflen, char);
 276     if (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
 277         unmungestr(otherbuf, buffer, buflen);
 278         sfree(otherbuf);
 279         return buffer;
 280     } else {
 281         sfree(otherbuf);
 282         return NULL;
 283     }
 284 }
 285
 286 void enum_settings_finish(void *handle)
 287 {
 288     struct enumsettings *e = (struct enumsettings *) handle;
 289     RegCloseKey(e->key);
 290     sfree(e);
 291 }
 292
 293 static void hostkey_regname(char *buffer, const char *hostname,
 294                             int port, const char *keytype)
 295 {
 296     int len;
 297     strcpy(buffer, keytype);
 298     strcat(buffer, "@");
 299     len = strlen(buffer);
 300     len += sprintf(buffer + len, "%d:", port);
 301     mungestr(hostname, buffer + strlen(buffer));
 302 }
 303
 304 int verify_host_key(const char *hostname, int port,
 305                     const char *keytype, const char *key)
 306 {
 307     char *otherstr, *regname;
 308     int len;
 309     HKEY rkey;
 310     DWORD readlen;
 311     DWORD type;
 312     int ret, compare;
 313
 314     len = 1 + strlen(key);
 315
 316     /*
 317      * Now read a saved key in from the registry and see what it
 318      * says.
 319      */
 320     otherstr = snewn(len, char);
 321     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 322
 323     hostkey_regname(regname, hostname, port, keytype);
 324
 325     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 326                    &rkey) != ERROR_SUCCESS)
 327         return 1;                      /* key does not exist in registry */
 328
 329     readlen = len;
 330     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 331
 332     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 333         !strcmp(keytype, "rsa")) {
 334         /*
 335          * Key didn't exist. If the key type is RSA, we'll try
 336          * another trick, which is to look up the _old_ key format
 337          * under just the hostname and translate that.
 338          */
 339         char *justhost = regname + 1 + strcspn(regname, ":");
 340         char *oldstyle = snewn(len + 10, char); /* safety margin */
 341         readlen = len;
 342         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 343                               oldstyle, &readlen);
 344
 345         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 346             /*
 347              * The old format is two old-style bignums separated by
 348              * a slash. An old-style bignum is made of groups of
 349              * four hex digits: digits are ordered in sensible
 350              * (most to least significant) order within each group,
 351              * but groups are ordered in silly (least to most)
 352              * order within the bignum. The new format is two
 353              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 354              * A nonzero except in the special case 0x0, which
 355              * doesn't appear anyway in RSA keys) separated by a
 356              * comma. All hex digits are lowercase in both formats.
 357              */
 358             char *p = otherstr;
 359             char *q = oldstyle;
 360             int i, j;
 361
 362             for (i = 0; i < 2; i++) {
 363                 int ndigits, nwords;
 364                 *p++ = '0';
 365                 *p++ = 'x';
 366                 ndigits = strcspn(q, "/");      /* find / or end of string */
 367                 nwords = ndigits / 4;
 368                 /* now trim ndigits to remove leading zeros */
 369                 while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
 370                     ndigits--;
 371                 /* now move digits over to new string */
 372                 for (j = 0; j < ndigits; j++)
 373                     p[ndigits - 1 - j] = q[j ^ 3];
 374                 p += ndigits;
 375                 q += nwords * 4;
 376                 if (*q) {
 377                     q++;               /* eat the slash */
 378                     *p++ = ',';        /* add a comma */
 379                 }
 380                 *p = '\0';             /* terminate the string */
 381             }
 382
 383             /*
 384              * Now _if_ this key matches, we'll enter it in the new
 385              * format. If not, we'll assume something odd went
 386              * wrong, and hyper-cautiously do nothing.
 387              */
 388             if (!strcmp(otherstr, key))
 389                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 390                               strlen(otherstr) + 1);
 391         }
 392     }
 393
 394     RegCloseKey(rkey);
 395
 396     compare = strcmp(otherstr, key);
 397
 398     sfree(otherstr);
 399     sfree(regname);
 400
 401     if (ret == ERROR_MORE_DATA ||
 402         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 403         return 2;                      /* key is different in registry */
 404     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 405         return 1;                      /* key does not exist in registry */
 406     else
 407         return 0;                      /* key matched OK in registry */
 408 }
 409
 410 void store_host_key(const char *hostname, int port,
 411                     const char *keytype, const char *key)
 412 {
 413     char *regname;
 414     HKEY rkey;
 415
 416     regname = snewn(3 * (strlen(hostname) + strlen(keytype)) + 15, char);
 417
 418     hostkey_regname(regname, hostname, port, keytype);
 419
 420     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 421                      &rkey) == ERROR_SUCCESS) {
 422         RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 423         RegCloseKey(rkey);
 424     } /* else key does not exist in registry */
 425
 426     sfree(regname);
 427 }
 428
 429 /*
 430  * Open (or delete) the random seed file.
 431  */
 432 enum { DEL, OPEN_R, OPEN_W };
 433 static int try_random_seed(char const *path, int action, HANDLE *ret)
 434 {
 435     if (action == DEL) {
 436         remove(path);
 437         *ret = INVALID_HANDLE_VALUE;
 438         return FALSE;                  /* so we'll do the next ones too */
 439     }
 440
 441     *ret = CreateFile(path,
 442                       action == OPEN_W ? GENERIC_WRITE : GENERIC_READ,
 443                       action == OPEN_W ? 0 : (FILE_SHARE_READ |
 444                                               FILE_SHARE_WRITE),
 445                       NULL,
 446                       action == OPEN_W ? CREATE_ALWAYS : OPEN_EXISTING,
 447                       action == OPEN_W ? FILE_ATTRIBUTE_NORMAL : 0,
 448                       NULL);
 449
 450     return (*ret != INVALID_HANDLE_VALUE);
 451 }
 452
 453 static HANDLE access_random_seed(int action)
 454 {
 455     HKEY rkey;
 456     DWORD type, size;
 457     HANDLE rethandle;
 458     char seedpath[2 * MAX_PATH + 10] = "\0";
 459
 460     /*
 461      * Iterate over a selection of possible random seed paths until
 462      * we find one that works.
 463      *
 464      * We do this iteration separately for reading and writing,
 465      * meaning that we will automatically migrate random seed files
 466      * if a better location becomes available (by reading from the
 467      * best location in which we actually find one, and then
 468      * writing to the best location in which we can _create_ one).
 469      */
 470
 471     /*
 472      * First, try the location specified by the user in the
 473      * Registry, if any.
 474      */
 475     size = sizeof(seedpath);
 476     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 477         ERROR_SUCCESS) {
 478         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 479                                   0, &type, seedpath, &size);
 480         if (ret != ERROR_SUCCESS || type != REG_SZ)
 481             seedpath[0] = '\0';
 482         RegCloseKey(rkey);
 483
 484         if (*seedpath && try_random_seed(seedpath, action, &rethandle))
 485             return rethandle;
 486     }
 487
 488     /*
 489      * Next, try the user's local Application Data directory,
 490      * followed by their non-local one. This is found using the
 491      * SHGetFolderPath function, which won't be present on all
 492      * versions of Windows.
 493      */
 494     if (!tried_shgetfolderpath) {
 495         /* This is likely only to bear fruit on systems with IE5+
 496          * installed, or WinMe/2K+. There is some faffing with
 497          * SHFOLDER.DLL we could do to try to find an equivalent
 498          * on older versions of Windows if we cared enough.
 499          * However, the invocation below requires IE5+ anyway,
 500          * so stuff that. */
 501         shell32_module = LoadLibrary("SHELL32.DLL");
 502         if (shell32_module) {
 503             p_SHGetFolderPath = (p_SHGetFolderPath_t)
 504                 GetProcAddress(shell32_module, "SHGetFolderPathA");
 505         }
 506     }
 507     if (p_SHGetFolderPath) {
 508         if (SUCCEEDED(p_SHGetFolderPath(NULL, CSIDL_LOCAL_APPDATA,
 509                                         NULL, SHGFP_TYPE_CURRENT, seedpath))) {
 510             strcat(seedpath, "\\PUTTY.RND");
 511             if (try_random_seed(seedpath, action, &rethandle))
 512                 return rethandle;
 513         }
 514
 515         if (SUCCEEDED(p_SHGetFolderPath(NULL, CSIDL_APPDATA,
 516                                         NULL, SHGFP_TYPE_CURRENT, seedpath))) {
 517             strcat(seedpath, "\\PUTTY.RND");
 518             if (try_random_seed(seedpath, action, &rethandle))
 519                 return rethandle;
 520         }
 521     }
 522
 523     /*
 524      * Failing that, try %HOMEDRIVE%%HOMEPATH% as a guess at the
 525      * user's home directory.
 526      */
 527     {
 528         int len, ret;
 529
 530         len =
 531             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 532                                    sizeof(seedpath));
 533         ret =
 534             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 535                                    sizeof(seedpath) - len);
 536         if (ret != 0) {
 537             strcat(seedpath, "\\PUTTY.RND");
 538             if (try_random_seed(seedpath, action, &rethandle))
 539                 return rethandle;
 540         }
 541     }
 542
 543     /*
 544      * And finally, fall back to C:\WINDOWS.
 545      */
 546     GetWindowsDirectory(seedpath, sizeof(seedpath));
 547     strcat(seedpath, "\\PUTTY.RND");
 548     if (try_random_seed(seedpath, action, &rethandle))
 549         return rethandle;
 550
 551     /*
 552      * If even that failed, give up.
 553      */
 554     return INVALID_HANDLE_VALUE;
 555 }
 556
 557 void read_random_seed(noise_consumer_t consumer)
 558 {
 559     HANDLE seedf = access_random_seed(OPEN_R);
 560
 561     if (seedf != INVALID_HANDLE_VALUE) {
 562         while (1) {
 563             char buf[1024];
 564             DWORD len;
 565
 566             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 567                 consumer(buf, len);
 568             else
 569                 break;
 570         }
 571         CloseHandle(seedf);
 572     }
 573 }
 574
 575 void write_random_seed(void *data, int len)
 576 {
 577     HANDLE seedf = access_random_seed(OPEN_W);
 578
 579     if (seedf != INVALID_HANDLE_VALUE) {
 580         DWORD lenwritten;
 581
 582         WriteFile(seedf, data, len, &lenwritten, NULL);
 583         CloseHandle(seedf);
 584     }
 585 }
 586
 587 /*
 588  * Recursively delete a registry key and everything under it.
 589  */
 590 static void registry_recursive_remove(HKEY key)
 591 {
 592     DWORD i;
 593     char name[MAX_PATH + 1];
 594     HKEY subkey;
 595
 596     i = 0;
 597     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 598         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 599             registry_recursive_remove(subkey);
 600             RegCloseKey(subkey);
 601         }
 602         RegDeleteKey(key, name);
 603     }
 604 }
 605
 606 void cleanup_all(void)
 607 {
 608     HKEY key;
 609     int ret;
 610     char name[MAX_PATH + 1];
 611
 612     /* ------------------------------------------------------------
 613      * Wipe out the random seed file, in all of its possible
 614      * locations.
 615      */
 616     access_random_seed(DEL);
 617
 618     /* ------------------------------------------------------------
 619      * Destroy all registry information associated with PuTTY.
 620      */
 621
 622     /*
 623      * Open the main PuTTY registry key and remove everything in it.
 624      */
 625     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 626         ERROR_SUCCESS) {
 627         registry_recursive_remove(key);
 628         RegCloseKey(key);
 629     }
 630     /*
 631      * Now open the parent key and remove the PuTTY main key. Once
 632      * we've done that, see if the parent key has any other
 633      * children.
 634      */
 635     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 636                    &key) == ERROR_SUCCESS) {
 637         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 638         ret = RegEnumKey(key, 0, name, sizeof(name));
 639         RegCloseKey(key);
 640         /*
 641          * If the parent key had no other children, we must delete
 642          * it in its turn. That means opening the _grandparent_
 643          * key.
 644          */
 645         if (ret != ERROR_SUCCESS) {
 646             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 647                            &key) == ERROR_SUCCESS) {
 648                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 649                 RegCloseKey(key);
 650             }
 651         }
 652     }
 653     /*
 654      * Now we're done.
 655      */
 656 }