d5859615 |
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 | } |