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