| 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 "putty.h" |
| 9 | #include "storage.h" |
| 10 | |
| 11 | static char seedpath[2*MAX_PATH+10] = "\0"; |
| 12 | |
| 13 | static char hex[16] = "0123456789ABCDEF"; |
| 14 | |
| 15 | static void mungestr(char *in, char *out) { |
| 16 | int candot = 0; |
| 17 | |
| 18 | while (*in) { |
| 19 | if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' || |
| 20 | *in == '%' || *in < ' ' || *in > '~' || (*in == '.' && !candot)) { |
| 21 | *out++ = '%'; |
| 22 | *out++ = hex[((unsigned char)*in) >> 4]; |
| 23 | *out++ = hex[((unsigned char)*in) & 15]; |
| 24 | } else |
| 25 | *out++ = *in; |
| 26 | in++; |
| 27 | candot = 1; |
| 28 | } |
| 29 | *out = '\0'; |
| 30 | return; |
| 31 | } |
| 32 | |
| 33 | static void unmungestr(char *in, char *out) { |
| 34 | while (*in) { |
| 35 | if (*in == '%' && in[1] && in[2]) { |
| 36 | int i, j; |
| 37 | |
| 38 | i = in[1] - '0'; i -= (i > 9 ? 7 : 0); |
| 39 | j = in[2] - '0'; j -= (j > 9 ? 7 : 0); |
| 40 | |
| 41 | *out++ = (i<<4) + j; |
| 42 | in += 3; |
| 43 | } else |
| 44 | *out++ = *in++; |
| 45 | } |
| 46 | *out = '\0'; |
| 47 | return; |
| 48 | } |
| 49 | |
| 50 | void *open_settings_w(char *sessionname); |
| 51 | void write_setting_s(void *handle, char *key, char *value); |
| 52 | void write_setting_i(void *handle, char *key, int value); |
| 53 | void *close_settings_w(void *handle); |
| 54 | |
| 55 | void *open_settings_r(char *sessionname); |
| 56 | char *read_setting_s(void *handle, char *key, char *buffer, int buflen); |
| 57 | int read_setting_i(void *handle, char *key, int defvalue); |
| 58 | void *close_settings_r(void *handle); |
| 59 | |
| 60 | static void hostkey_regname(char *buffer, char *hostname, char *keytype) { |
| 61 | strcpy(buffer, keytype); |
| 62 | strcat(buffer, "@"); |
| 63 | mungestr(hostname, buffer + strlen(buffer)); |
| 64 | } |
| 65 | |
| 66 | int verify_host_key(char *hostname, char *keytype, char *key) { |
| 67 | char *otherstr, *regname; |
| 68 | int len; |
| 69 | HKEY rkey; |
| 70 | DWORD readlen; |
| 71 | DWORD type; |
| 72 | int ret, compare; |
| 73 | |
| 74 | len = 1 + strlen(key); |
| 75 | |
| 76 | /* |
| 77 | * Now read a saved key in from the registry and see what it |
| 78 | * says. |
| 79 | */ |
| 80 | otherstr = smalloc(len); |
| 81 | regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5); |
| 82 | if (!otherstr || !regname) |
| 83 | fatalbox("Out of memory"); |
| 84 | |
| 85 | hostkey_regname(regname, hostname, keytype); |
| 86 | |
| 87 | if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys", |
| 88 | &rkey) != ERROR_SUCCESS) |
| 89 | return 1; /* key does not exist in registry */ |
| 90 | |
| 91 | readlen = len; |
| 92 | ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen); |
| 93 | |
| 94 | if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA && |
| 95 | !strcmp(keytype, "rsa")) { |
| 96 | /* |
| 97 | * Key didn't exist. If the key type is RSA, we'll try |
| 98 | * another trick, which is to look up the _old_ key format |
| 99 | * under just the hostname and translate that. |
| 100 | */ |
| 101 | char *justhost = regname + 1 + strlen(keytype); |
| 102 | char *oldstyle = smalloc(len + 10); /* safety margin */ |
| 103 | readlen = len; |
| 104 | ret = RegQueryValueEx(rkey, justhost, NULL, &type, |
| 105 | oldstyle, &readlen); |
| 106 | |
| 107 | if (ret == ERROR_SUCCESS && type == REG_SZ) { |
| 108 | /* |
| 109 | * The old format is two old-style bignums separated by |
| 110 | * a slash. An old-style bignum is made of groups of |
| 111 | * four hex digits: digits are ordered in sensible |
| 112 | * (most to least significant) order within each group, |
| 113 | * but groups are ordered in silly (least to most) |
| 114 | * order within the bignum. The new format is two |
| 115 | * ordinary C-format hex numbers (0xABCDEFG...XYZ, with |
| 116 | * A nonzero except in the special case 0x0, which |
| 117 | * doesn't appear anyway in RSA keys) separated by a |
| 118 | * comma. All hex digits are lowercase in both formats. |
| 119 | */ |
| 120 | char *p = otherstr; |
| 121 | char *q = oldstyle; |
| 122 | int i, j; |
| 123 | |
| 124 | for (i = 0; i < 2; i++) { |
| 125 | int ndigits, nwords; |
| 126 | *p++ = '0'; *p++ = 'x'; |
| 127 | ndigits = strcspn(q, "/"); /* find / or end of string */ |
| 128 | nwords = ndigits / 4; |
| 129 | /* now trim ndigits to remove leading zeros */ |
| 130 | while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1) |
| 131 | ndigits--; |
| 132 | /* now move digits over to new string */ |
| 133 | for (j = 0; j < ndigits; j++) |
| 134 | p[ndigits-1-j] = q[j^3]; |
| 135 | p += ndigits; |
| 136 | q += nwords*4; |
| 137 | if (*q) { |
| 138 | q++; /* eat the slash */ |
| 139 | *p++ = ','; /* add a comma */ |
| 140 | } |
| 141 | *p = '\0'; /* terminate the string */ |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Now _if_ this key matches, we'll enter it in the new |
| 146 | * format. If not, we'll assume something odd went |
| 147 | * wrong, and hyper-cautiously do nothing. |
| 148 | */ |
| 149 | if (!strcmp(otherstr, key)) |
| 150 | RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr, |
| 151 | strlen(otherstr)+1); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | RegCloseKey(rkey); |
| 156 | |
| 157 | compare = strcmp(otherstr, key); |
| 158 | |
| 159 | sfree(otherstr); |
| 160 | sfree(regname); |
| 161 | |
| 162 | if (ret == ERROR_MORE_DATA || |
| 163 | (ret == ERROR_SUCCESS && type == REG_SZ && compare)) |
| 164 | return 2; /* key is different in registry */ |
| 165 | else if (ret != ERROR_SUCCESS || type != REG_SZ) |
| 166 | return 1; /* key does not exist in registry */ |
| 167 | else |
| 168 | return 0; /* key matched OK in registry */ |
| 169 | } |
| 170 | |
| 171 | void store_host_key(char *hostname, char *keytype, char *key) { |
| 172 | char *regname; |
| 173 | HKEY rkey; |
| 174 | |
| 175 | regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5); |
| 176 | if (!regname) |
| 177 | fatalbox("Out of memory"); |
| 178 | |
| 179 | hostkey_regname(regname, hostname, keytype); |
| 180 | |
| 181 | if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys", |
| 182 | &rkey) != ERROR_SUCCESS) |
| 183 | return; /* key does not exist in registry */ |
| 184 | RegSetValueEx(rkey, regname, 0, REG_SZ, key, |
| 185 | strlen(key)+1); |
| 186 | RegCloseKey(rkey); |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * Find the random seed file path and store it in `seedpath'. |
| 191 | */ |
| 192 | static void get_seedpath(void) { |
| 193 | HKEY rkey; |
| 194 | DWORD type, size; |
| 195 | |
| 196 | size = sizeof(seedpath); |
| 197 | |
| 198 | if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) { |
| 199 | int ret = RegQueryValueEx(rkey, "RandSeedFile", |
| 200 | 0, &type, seedpath, &size); |
| 201 | if (ret != ERROR_SUCCESS || type != REG_SZ) |
| 202 | seedpath[0] = '\0'; |
| 203 | RegCloseKey(rkey); |
| 204 | } else |
| 205 | seedpath[0] = '\0'; |
| 206 | |
| 207 | if (!seedpath[0]) { |
| 208 | int len, ret; |
| 209 | |
| 210 | len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath)); |
| 211 | ret = GetEnvironmentVariable("HOMEPATH", seedpath+len, |
| 212 | sizeof(seedpath)-len); |
| 213 | if (ret == 0) { /* probably win95; store in \WINDOWS */ |
| 214 | GetWindowsDirectory(seedpath, sizeof(seedpath)); |
| 215 | len = strlen(seedpath); |
| 216 | } else |
| 217 | len += ret; |
| 218 | strcpy(seedpath+len, "\\PUTTY.RND"); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | void read_random_seed(noise_consumer_t consumer) { |
| 223 | HANDLE seedf; |
| 224 | |
| 225 | if (!seedpath[0]) |
| 226 | get_seedpath(); |
| 227 | |
| 228 | seedf = CreateFile(seedpath, GENERIC_READ, |
| 229 | FILE_SHARE_READ | FILE_SHARE_WRITE, |
| 230 | NULL, OPEN_EXISTING, 0, NULL); |
| 231 | |
| 232 | if (seedf != INVALID_HANDLE_VALUE) { |
| 233 | while (1) { |
| 234 | char buf[1024]; |
| 235 | DWORD len; |
| 236 | |
| 237 | if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len) |
| 238 | consumer(buf, len); |
| 239 | else |
| 240 | break; |
| 241 | } |
| 242 | CloseHandle(seedf); |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | void write_random_seed(void *data, size_t len) { |
| 247 | HANDLE seedf; |
| 248 | |
| 249 | if (!seedpath[0]) |
| 250 | get_seedpath(); |
| 251 | |
| 252 | seedf = CreateFile(seedpath, GENERIC_WRITE, 0, |
| 253 | NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); |
| 254 | |
| 255 | if (seedf != INVALID_HANDLE_VALUE) { |
| 256 | DWORD lenwritten; |
| 257 | |
| 258 | WriteFile(seedf, data, len, &lenwritten, NULL); |
| 259 | CloseHandle(seedf); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Recursively delete a registry key and everything under it. |
| 265 | */ |
| 266 | static void registry_recursive_remove(HKEY key) { |
| 267 | DWORD i; |
| 268 | char name[MAX_PATH+1]; |
| 269 | HKEY subkey; |
| 270 | |
| 271 | i = 0; |
| 272 | while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) { |
| 273 | if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) { |
| 274 | registry_recursive_remove(subkey); |
| 275 | RegCloseKey(subkey); |
| 276 | } |
| 277 | RegDeleteKey(key, name); |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | void cleanup_all(void) { |
| 282 | HKEY key; |
| 283 | int ret; |
| 284 | char name[MAX_PATH+1]; |
| 285 | |
| 286 | /* ------------------------------------------------------------ |
| 287 | * Wipe out the random seed file. |
| 288 | */ |
| 289 | if (!seedpath[0]) |
| 290 | get_seedpath(); |
| 291 | remove(seedpath); |
| 292 | |
| 293 | /* ------------------------------------------------------------ |
| 294 | * Destroy all registry information associated with PuTTY. |
| 295 | */ |
| 296 | |
| 297 | /* |
| 298 | * Open the main PuTTY registry key and remove everything in it. |
| 299 | */ |
| 300 | if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) { |
| 301 | registry_recursive_remove(key); |
| 302 | RegCloseKey(key); |
| 303 | } |
| 304 | /* |
| 305 | * Now open the parent key and remove the PuTTY main key. Once |
| 306 | * we've done that, see if the parent key has any other |
| 307 | * children. |
| 308 | */ |
| 309 | if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT, |
| 310 | &key) == ERROR_SUCCESS) { |
| 311 | RegDeleteKey(key, PUTTY_REG_PARENT_CHILD); |
| 312 | ret = RegEnumKey(key, 0, name, sizeof(name)); |
| 313 | RegCloseKey(key); |
| 314 | /* |
| 315 | * If the parent key had no other children, we must delete |
| 316 | * it in its turn. That means opening the _grandparent_ |
| 317 | * key. |
| 318 | */ |
| 319 | if (ret != ERROR_SUCCESS) { |
| 320 | if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT, |
| 321 | &key) == ERROR_SUCCESS) { |
| 322 | RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD); |
| 323 | RegCloseKey(key); |
| 324 | } |
| 325 | } |
| 326 | } |
| 327 | /* |
| 328 | * Now we're done. |
| 329 | */ |
| 330 | } |