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 #ifndef AUTO_WINSOCK
   8 #ifdef WINSOCK_TWO
   9 #include <winsock2.h>
  10 #else
  11 #include <winsock.h>
  12 #endif
  13 #endif
  14 #include <stdio.h>
  15 #include "putty.h"
  16 #include "storage.h"
  17
  18 static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
  19
  20 static char seedpath[2*MAX_PATH+10] = "\0";
  21
  22 static char hex[16] = "0123456789ABCDEF";
  23
  24 static void mungestr(char *in, char *out) {
  25     int candot = 0;
  26
  27     while (*in) {
  28         if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
  29             *in == '%' || *in < ' ' || *in > '~' || (*in == '.' && !candot)) {
  30             *out++ = '%';
  31             *out++ = hex[((unsigned char)*in) >> 4];
  32             *out++ = hex[((unsigned char)*in) & 15];
  33         } else
  34             *out++ = *in;
  35         in++;
  36         candot = 1;
  37     }
  38     *out = '\0';
  39     return;
  40 }
  41
  42 static void unmungestr(char *in, char *out, int outlen) {
  43     while (*in) {
  44         if (*in == '%' && in[1] && in[2]) {
  45             int i, j;
  46
  47             i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
  48             j = in[2] - '0'; j -= (j > 9 ? 7 : 0);
  49
  50             *out++ = (i<<4) + j;
  51             if (!--outlen) return;
  52             in += 3;
  53         } else {
  54             *out++ = *in++;
  55             if (!--outlen) return;
  56         }
  57     }
  58     *out = '\0';
  59     return;
  60 }
  61
  62 void *open_settings_w(char *sessionname) {
  63     HKEY subkey1, sesskey;
  64     int ret;
  65     char *p;
  66
  67     p = malloc(3*strlen(sessionname)+1);
  68     mungestr(sessionname, p);
  69
  70     ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
  71     if (ret != ERROR_SUCCESS) {
  72         free(p);
  73         return NULL;
  74     }
  75     ret = RegCreateKey(subkey1, p, &sesskey);
  76     free(p);
  77     RegCloseKey(subkey1);
  78     if (ret != ERROR_SUCCESS)
  79         return NULL;
  80     return (void *)sesskey;
  81 }
  82
  83 void write_setting_s(void *handle, char *key, char *value) {
  84     if (handle)
  85         RegSetValueEx((HKEY)handle, key, 0, REG_SZ, value, 1+strlen(value));
  86 }
  87
  88 void write_setting_i(void *handle, char *key, int value) {
  89     if (handle)
  90         RegSetValueEx((HKEY)handle, key, 0, REG_DWORD,
  91                       (CONST BYTE *)&value, sizeof(value));
  92 }
  93
  94 void close_settings_w(void *handle) {
  95     RegCloseKey((HKEY)handle);
  96 }
  97
  98 void *open_settings_r(char *sessionname) {
  99     HKEY subkey1, sesskey;
 100     char *p;
 101
 102     p = malloc(3*strlen(sessionname)+1);
 103     mungestr(sessionname, p);
 104
 105     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
 106         sesskey = NULL;
 107     } else {
 108         if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
 109             sesskey = NULL;
 110         }
 111         RegCloseKey(subkey1);
 112     }
 113
 114     free(p);
 115
 116     return (void *)sesskey;
 117 }
 118
 119 char *read_setting_s(void *handle, char *key, char *buffer, int buflen) {
 120     DWORD type, size;
 121     size = buflen;
 122
 123     if (!handle ||
 124         RegQueryValueEx((HKEY)handle, key, 0,
 125                         &type, buffer, &size) != ERROR_SUCCESS ||
 126         type != REG_SZ)
 127         return NULL;
 128     else
 129         return buffer;
 130 }
 131
 132 int read_setting_i(void *handle, char *key, int defvalue) {
 133     DWORD type, val, size;
 134     size = sizeof(val);
 135
 136     if (!handle ||
 137         RegQueryValueEx((HKEY)handle, key, 0, &type,
 138                         (BYTE *)&val, &size) != ERROR_SUCCESS ||
 139         size != sizeof(val) || type != REG_DWORD)
 140         return defvalue;
 141     else
 142         return val;
 143 }
 144
 145 void close_settings_r(void *handle) {
 146     RegCloseKey((HKEY)handle);
 147 }
 148
 149 void del_settings (char *sessionname) {
 150     HKEY subkey1;
 151     char *p;
 152
 153     if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
 154         return;
 155
 156     p = malloc(3*strlen(sessionname)+1);
 157     mungestr(sessionname, p);
 158     RegDeleteKey(subkey1, p);
 159     free(p);
 160
 161     RegCloseKey(subkey1);
 162 }
 163
 164 struct enumsettings {
 165     HKEY key;
 166     int i;
 167 };
 168
 169 void *enum_settings_start(void) {
 170     struct enumsettings *ret;
 171     HKEY key;
 172
 173     if (RegCreateKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
 174         return NULL;
 175
 176     ret = malloc(sizeof(*ret));
 177     if (ret) {
 178         ret->key = key;
 179         ret->i = 0;
 180     }
 181
 182     return ret;
 183 }
 184
 185 char *enum_settings_next(void *handle, char *buffer, int buflen) {
 186     struct enumsettings *e = (struct enumsettings *)handle;
 187     char *otherbuf;
 188     otherbuf = malloc(3*buflen);
 189     if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
 190                                3*buflen) == ERROR_SUCCESS) {
 191         unmungestr(otherbuf, buffer, buflen);
 192         free(otherbuf);
 193         return buffer;
 194     } else
 195         return NULL;
 196
 197 }
 198
 199 void enum_settings_finish(void *handle) {
 200     struct enumsettings *e = (struct enumsettings *)handle;
 201     RegCloseKey(e->key);
 202     free(e);
 203 }
 204
 205 static void hostkey_regname(char *buffer, char *hostname,
 206                             int port, char *keytype) {
 207     int len;
 208     strcpy(buffer, keytype);
 209     strcat(buffer, "@");
 210     len = strlen(buffer);
 211     len += sprintf(buffer+len, "%d:", port);
 212     mungestr(hostname, buffer + strlen(buffer));
 213 }
 214
 215 int verify_host_key(char *hostname, int port, char *keytype, char *key) {
 216     char *otherstr, *regname;
 217     int len;
 218     HKEY rkey;
 219     DWORD readlen;
 220     DWORD type;
 221     int ret, compare;
 222
 223     len = 1 + strlen(key);
 224
 225     /*
 226      * Now read a saved key in from the registry and see what it
 227      * says.
 228      */
 229     otherstr = smalloc(len);
 230     regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
 231
 232     hostkey_regname(regname, hostname, port, keytype);
 233
 234     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 235                      &rkey) != ERROR_SUCCESS)
 236         return 1;                      /* key does not exist in registry */
 237
 238     readlen = len;
 239     ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
 240
 241     if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
 242         !strcmp(keytype, "rsa")) {
 243         /*
 244          * Key didn't exist. If the key type is RSA, we'll try
 245          * another trick, which is to look up the _old_ key format
 246          * under just the hostname and translate that.
 247          */
 248         char *justhost = regname + 1 + strcspn(regname, ":");
 249         char *oldstyle = smalloc(len + 10);   /* safety margin */
 250         readlen = len;
 251         ret = RegQueryValueEx(rkey, justhost, NULL, &type,
 252                               oldstyle, &readlen);
 253
 254         if (ret == ERROR_SUCCESS && type == REG_SZ) {
 255             /*
 256              * The old format is two old-style bignums separated by
 257              * a slash. An old-style bignum is made of groups of
 258              * four hex digits: digits are ordered in sensible
 259              * (most to least significant) order within each group,
 260              * but groups are ordered in silly (least to most)
 261              * order within the bignum. The new format is two
 262              * ordinary C-format hex numbers (0xABCDEFG...XYZ, with
 263              * A nonzero except in the special case 0x0, which
 264              * doesn't appear anyway in RSA keys) separated by a
 265              * comma. All hex digits are lowercase in both formats.
 266              */
 267             char *p = otherstr;
 268             char *q = oldstyle;
 269             int i, j;
 270
 271             for (i = 0; i < 2; i++) {
 272                 int ndigits, nwords;
 273                 *p++ = '0'; *p++ = 'x';
 274                 ndigits = strcspn(q, "/");   /* find / or end of string */
 275                 nwords = ndigits / 4;
 276                 /* now trim ndigits to remove leading zeros */
 277                 while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1)
 278                     ndigits--;
 279                 /* now move digits over to new string */
 280                 for (j = 0; j < ndigits; j++)
 281                     p[ndigits-1-j] = q[j^3];
 282                 p += ndigits;
 283                 q += nwords*4;
 284                 if (*q) {
 285                     q++;               /* eat the slash */
 286                     *p++ = ',';        /* add a comma */
 287                 }
 288                 *p = '\0';             /* terminate the string */
 289             }
 290
 291             /*
 292              * Now _if_ this key matches, we'll enter it in the new
 293              * format. If not, we'll assume something odd went
 294              * wrong, and hyper-cautiously do nothing.
 295              */
 296             if (!strcmp(otherstr, key))
 297                 RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
 298                               strlen(otherstr)+1);
 299         }
 300     }
 301
 302     RegCloseKey(rkey);
 303
 304     compare = strcmp(otherstr, key);
 305
 306     sfree(otherstr);
 307     sfree(regname);
 308
 309     if (ret == ERROR_MORE_DATA ||
 310         (ret == ERROR_SUCCESS && type == REG_SZ && compare))
 311         return 2;                      /* key is different in registry */
 312     else if (ret != ERROR_SUCCESS || type != REG_SZ)
 313         return 1;                      /* key does not exist in registry */
 314     else
 315         return 0;                      /* key matched OK in registry */
 316 }
 317
 318 void store_host_key(char *hostname, int port, char *keytype, char *key) {
 319     char *regname;
 320     HKEY rkey;
 321
 322     regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
 323
 324     hostkey_regname(regname, hostname, port, keytype);
 325
 326     if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
 327                      &rkey) != ERROR_SUCCESS)
 328         return;                        /* key does not exist in registry */
 329     RegSetValueEx(rkey, regname, 0, REG_SZ, key,
 330                   strlen(key)+1);
 331     RegCloseKey(rkey);
 332 }
 333
 334 /*
 335  * Find the random seed file path and store it in `seedpath'.
 336  */
 337 static void get_seedpath(void) {
 338     HKEY rkey;
 339     DWORD type, size;
 340
 341     size = sizeof(seedpath);
 342
 343     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
 344         int ret = RegQueryValueEx(rkey, "RandSeedFile",
 345                                   0, &type, seedpath, &size);
 346         if (ret != ERROR_SUCCESS || type != REG_SZ)
 347             seedpath[0] = '\0';
 348         RegCloseKey(rkey);
 349     } else
 350         seedpath[0] = '\0';
 351
 352     if (!seedpath[0]) {
 353         int len, ret;
 354
 355         len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
 356         ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
 357                                       sizeof(seedpath)-len);
 358         if (ret == 0) {                /* probably win95; store in \WINDOWS */
 359             GetWindowsDirectory(seedpath, sizeof(seedpath));
 360             len = strlen(seedpath);
 361         } else
 362             len += ret;
 363         strcpy(seedpath+len, "\\PUTTY.RND");
 364     }
 365 }
 366
 367 void read_random_seed(noise_consumer_t consumer) {
 368     HANDLE seedf;
 369
 370     if (!seedpath[0])
 371         get_seedpath();
 372
 373     seedf = CreateFile(seedpath, GENERIC_READ,
 374                        FILE_SHARE_READ | FILE_SHARE_WRITE,
 375                        NULL, OPEN_EXISTING, 0, NULL);
 376
 377     if (seedf != INVALID_HANDLE_VALUE) {
 378         while (1) {
 379             char buf[1024];
 380             DWORD len;
 381
 382             if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
 383                 consumer(buf, len);
 384             else
 385                 break;
 386         }
 387         CloseHandle(seedf);
 388     }
 389 }
 390
 391 void write_random_seed(void *data, int len) {
 392     HANDLE seedf;
 393
 394     if (!seedpath[0])
 395         get_seedpath();
 396
 397     seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
 398                        NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 399
 400     if (seedf != INVALID_HANDLE_VALUE) {
 401         DWORD lenwritten;
 402
 403         WriteFile(seedf, data, len, &lenwritten, NULL);
 404         CloseHandle(seedf);
 405     }
 406 }
 407
 408 /*
 409  * Recursively delete a registry key and everything under it.
 410  */
 411 static void registry_recursive_remove(HKEY key) {
 412     DWORD i;
 413     char name[MAX_PATH+1];
 414     HKEY subkey;
 415
 416     i = 0;
 417     while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
 418         if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
 419             registry_recursive_remove(subkey);
 420             RegCloseKey(subkey);
 421         }
 422         RegDeleteKey(key, name);
 423     }
 424 }
 425
 426 void cleanup_all(void) {
 427     HKEY key;
 428     int ret;
 429     char name[MAX_PATH+1];
 430
 431     /* ------------------------------------------------------------
 432      * Wipe out the random seed file.
 433      */
 434     if (!seedpath[0])
 435         get_seedpath();
 436     remove(seedpath);
 437
 438     /* ------------------------------------------------------------
 439      * Destroy all registry information associated with PuTTY.
 440      */
 441
 442     /*
 443      * Open the main PuTTY registry key and remove everything in it.
 444      */
 445     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) {
 446         registry_recursive_remove(key);
 447         RegCloseKey(key);
 448     }
 449     /*
 450      * Now open the parent key and remove the PuTTY main key. Once
 451      * we've done that, see if the parent key has any other
 452      * children.
 453      */
 454     if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
 455                    &key) == ERROR_SUCCESS) {
 456         RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
 457         ret = RegEnumKey(key, 0, name, sizeof(name));
 458         RegCloseKey(key);
 459         /*
 460          * If the parent key had no other children, we must delete
 461          * it in its turn. That means opening the _grandparent_
 462          * key.
 463          */
 464         if (ret != ERROR_SUCCESS) {
 465             if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
 466                            &key) == ERROR_SUCCESS) {
 467                 RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
 468                 RegCloseKey(key);
 469             }
 470         }
 471     }
 472     /*
 473      * Now we're done.
 474      */
 475 }