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 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)
  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, const char *key, const 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, const 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(const 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, const 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, const 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(const 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 (RegOpenKey(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 (RegEnumKey(e->key, e->i++, otherbuf, 3 * buflen) == ERROR_SUCCESS) {
 202         unmungestr(otherbuf, buffer, buflen);
 203         sfree(otherbuf);
 204         return buffer;
 205     } else {
 206         sfree(otherbuf);
 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, const char *hostname,
 219                             int port, const 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(const char *hostname, int port,
 230                     const char *keytype, const char *key)
 231 {
 232     char *otherstr, *regname;
 233     int len;
 234     HKEY rkey;
 235     DWORD readlen;
 236     DWORD type;
 237     int ret, compare;
 238
 239     len = 1 + strlen(key);
 240
 241     /*
 242      * Now read a saved key in from the registry and see what it
 243      * says.
 244      */
 245     otherstr = smalloc(len);
 246     regname = smalloc(3 * (strlen(hostname) + strlen(keytype)) + 15);
 247
 248     hostkey_regname(regname, hostname, port, keytype);
 249
 250     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 251                    &rkey) != ERROR_SUCCESS)
 252         return 1;                      /* key does not exist in registry */
 253
 254     readlen = len;
 255     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 256
 257     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 258         !strcmp(keytype, "rsa")) {
 259         /*
 260          * Key didn't exist. If the key type is RSA, we'll try
 261          * another trick, which is to look up the _old_ key format
 262          * under just the hostname and translate that.
 263          */
 264         char *justhost = regname + 1 + strcspn(regname, ":");
 265         char *oldstyle = smalloc(len + 10);     /* safety margin */
 266         readlen = len;
 267         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 268                               oldstyle, &readlen);
 269
 270         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 271             /*
 272              * The old format is two old-style bignums separated by
 273              * a slash. An old-style bignum is made of groups of
 274              * four hex digits: digits are ordered in sensible
 275              * (most to least significant) order within each group,
 276              * but groups are ordered in silly (least to most)
 277              * order within the bignum. The new format is two
 278              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 279              * A nonzero except in the special case 0x0, which
 280              * doesn't appear anyway in RSA keys) separated by a
 281              * comma. All hex digits are lowercase in both formats.
 282              */
 283             char *p = otherstr;
 284             char *q = oldstyle;
 285             int i, j;
 286
 287             for (i = 0; i < 2; i++) {
 288                 int ndigits, nwords;
 289                 *p++ = '0';
 290                 *p++ = 'x';
 291                 ndigits = strcspn(q, "/");      /* find / or end of string */
 292                 nwords = ndigits / 4;
 293                 /* now trim ndigits to remove leading zeros */
 294                 while (q[(ndigits - 1) ^ 3] == '0' && ndigits > 1)
 295                     ndigits--;
 296                 /* now move digits over to new string */
 297                 for (j = 0; j < ndigits; j++)
 298                     p[ndigits - 1 - j] = q[j ^ 3];
 299                 p += ndigits;
 300                 q += nwords * 4;
 301                 if (*q) {
 302                     q++;               /* eat the slash */
 303                     *p++ = ',';        /* add a comma */
 304                 }
 305                 *p = '\0';             /* terminate the string */
 306             }
 307
 308             /*
 309              * Now _if_ this key matches, we'll enter it in the new
 310              * format. If not, we'll assume something odd went
 311              * wrong, and hyper-cautiously do nothing.
 312              */
 313             if (!strcmp(otherstr, key))
 314                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 315                               strlen(otherstr) + 1);
 316         }
 317     }
 318
 319     RegCloseKey(rkey);
 320
 321     compare = strcmp(otherstr, key);
 322
 323     sfree(otherstr);
 324     sfree(regname);
 325
 326     if (ret == ERROR_MORE_DATA ||
 327         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 328         return 2;                      /* key is different in registry */
 329     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 330         return 1;                      /* key does not exist in registry */
 331     else
 332         return 0;                      /* key matched OK in registry */
 333 }
 334
 335 void store_host_key(const char *hostname, int port,
 336                     const char *keytype, const char *key)
 337 {
 338     char *regname;
 339     HKEY rkey;
 340
 341     regname = smalloc(3 * (strlen(hostname) + strlen(keytype)) + 15);
 342
 343     hostkey_regname(regname, hostname, port, keytype);
 344
 345     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 346                      &rkey) != ERROR_SUCCESS)
 347         return;                        /* key does not exist in registry */
 348     RegSetValueEx(rkey, regname, 0, REG_SZ, key, strlen(key) + 1);
 349     RegCloseKey(rkey);
 350 }
 351
 352 /*
 353  * Find the random seed file path and store it in `seedpath'.
 354  */
 355 static void get_seedpath(void)
 356 {
 357     HKEY rkey;
 358     DWORD type, size;
 359
 360     size = sizeof(seedpath);
 361
 362     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey) ==
 363         ERROR_SUCCESS) {
 364         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 365                                   0, &type, seedpath, &size);
 366         if (ret != ERROR_SUCCESS || type != REG_SZ)
 367             seedpath[0] = '\0';
 368         RegCloseKey(rkey);
 369     } else
 370         seedpath[0] = '\0';
 371
 372     if (!seedpath[0]) {
 373         int len, ret;
 374
 375         len =
 376             GetEnvironmentVariable("HOMEDRIVE", seedpath,
 377                                    sizeof(seedpath));
 378         ret =
 379             GetEnvironmentVariable("HOMEPATH", seedpath + len,
 380                                    sizeof(seedpath) - len);
 381         if (ret == 0) {                /* probably win95; store in \WINDOWS */
 382             GetWindowsDirectory(seedpath, sizeof(seedpath));
 383             len = strlen(seedpath);
 384         } else
 385             len += ret;
 386         strcpy(seedpath + len, "\\PUTTY.RND");
 387     }
 388 }
 389
 390 void read_random_seed(noise_consumer_t consumer)
 391 {
 392     HANDLE seedf;
 393
 394     if (!seedpath[0])
 395         get_seedpath();
 396
 397     seedf = CreateFile(seedpath, GENERIC_READ,
 398                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 399                        NULL, OPEN_EXISTING, 0, NULL);
 400
 401     if (seedf != INVALID_HANDLE_VALUE) {
 402         while (1) {
 403             char buf[1024];
 404             DWORD len;
 405
 406             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 407                 consumer(buf, len);
 408             else
 409                 break;
 410         }
 411         CloseHandle(seedf);
 412     }
 413 }
 414
 415 void write_random_seed(void *data, int len)
 416 {
 417     HANDLE seedf;
 418
 419     if (!seedpath[0])
 420         get_seedpath();
 421
 422     seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
 423                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 424
 425     if (seedf != INVALID_HANDLE_VALUE) {
 426         DWORD lenwritten;
 427
 428         WriteFile(seedf, data, len, &lenwritten, NULL);
 429         CloseHandle(seedf);
 430     }
 431 }
 432
 433 /*
 434  * Recursively delete a registry key and everything under it.
 435  */
 436 static void registry_recursive_remove(HKEY key)
 437 {
 438     DWORD i;
 439     char name[MAX_PATH + 1];
 440     HKEY subkey;
 441
 442     i = 0;
 443     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 444         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 445             registry_recursive_remove(subkey);
 446             RegCloseKey(subkey);
 447         }
 448         RegDeleteKey(key, name);
 449     }
 450 }
 451
 452 void cleanup_all(void)
 453 {
 454     HKEY key;
 455     int ret;
 456     char name[MAX_PATH + 1];
 457
 458     /* ------------------------------------------------------------
 459      * Wipe out the random seed file.
 460      */
 461     if (!seedpath[0])
 462         get_seedpath();
 463     remove(seedpath);
 464
 465     /* ------------------------------------------------------------
 466      * Destroy all registry information associated with PuTTY.
 467      */
 468
 469     /*
 470      * Open the main PuTTY registry key and remove everything in it.
 471      */
 472     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) ==
 473         ERROR_SUCCESS) {
 474         registry_recursive_remove(key);
 475         RegCloseKey(key);
 476     }
 477     /*
 478      * Now open the parent key and remove the PuTTY main key. Once
 479      * we've done that, see if the parent key has any other
 480      * children.
 481      */
 482     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 483                    &key) == ERROR_SUCCESS) {
 484         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 485         ret = RegEnumKey(key, 0, name, sizeof(name));
 486         RegCloseKey(key);
 487         /*
 488          * If the parent key had no other children, we must delete
 489          * it in its turn. That means opening the _grandparent_
 490          * key.
 491          */
 492         if (ret != ERROR_SUCCESS) {
 493             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 494                            &key) == ERROR_SUCCESS) {
 495                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 496                 RegCloseKey(key);
 497             }
 498         }
 499     }
 500     /*
 501      * Now we're done.
 502      */
 503 }