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