1 | /* |
---|
2 | * win32_crypto.c: win32 providers for SVN_AUTH_* |
---|
3 | * |
---|
4 | * ==================================================================== |
---|
5 | * Copyright (c) 2003-2006, 2008 CollabNet. All rights reserved. |
---|
6 | * |
---|
7 | * This software is licensed as described in the file COPYING, which |
---|
8 | * you should have received as part of this distribution. The terms |
---|
9 | * are also available at http://subversion.tigris.org/license-1.html. |
---|
10 | * If newer versions of this license are posted there, you may use a |
---|
11 | * newer version instead, at your option. |
---|
12 | * |
---|
13 | * This software consists of voluntary contributions made by many |
---|
14 | * individuals. For exact contribution history, see the revision |
---|
15 | * history and logs, available at http://subversion.tigris.org/. |
---|
16 | * ==================================================================== |
---|
17 | */ |
---|
18 | |
---|
19 | /* ==================================================================== */ |
---|
20 | |
---|
21 | #if defined(WIN32) && !defined(__MINGW32__) |
---|
22 | |
---|
23 | /*** Includes. ***/ |
---|
24 | |
---|
25 | #include <apr_pools.h> |
---|
26 | #include "svn_auth.h" |
---|
27 | #include "svn_error.h" |
---|
28 | #include "svn_utf.h" |
---|
29 | #include "svn_config.h" |
---|
30 | #include "svn_user.h" |
---|
31 | |
---|
32 | #include "private/svn_auth_private.h" |
---|
33 | |
---|
34 | #include "svn_private_config.h" |
---|
35 | |
---|
36 | #include <wincrypt.h> |
---|
37 | #include <apr_base64.h> |
---|
38 | |
---|
39 | /*-----------------------------------------------------------------------*/ |
---|
40 | /* Windows simple provider, encrypts the password on Win2k and later. */ |
---|
41 | /*-----------------------------------------------------------------------*/ |
---|
42 | |
---|
43 | /* The description string that's combined with unencrypted data by the |
---|
44 | Windows CryptoAPI. Used during decryption to verify that the |
---|
45 | encrypted data were valid. */ |
---|
46 | static const WCHAR description[] = L"auth_svn.simple.wincrypt"; |
---|
47 | |
---|
48 | /* Implementation of svn_auth__password_set_t that encrypts |
---|
49 | the incoming password using the Windows CryptoAPI. */ |
---|
50 | static svn_boolean_t |
---|
51 | windows_password_encrypter(apr_hash_t *creds, |
---|
52 | const char *realmstring, |
---|
53 | const char *username, |
---|
54 | const char *in, |
---|
55 | apr_hash_t *parameters, |
---|
56 | svn_boolean_t non_interactive, |
---|
57 | apr_pool_t *pool) |
---|
58 | { |
---|
59 | DATA_BLOB blobin; |
---|
60 | DATA_BLOB blobout; |
---|
61 | svn_boolean_t crypted; |
---|
62 | |
---|
63 | blobin.cbData = strlen(in); |
---|
64 | blobin.pbData = (BYTE*) in; |
---|
65 | crypted = CryptProtectData(&blobin, description, NULL, NULL, NULL, |
---|
66 | CRYPTPROTECT_UI_FORBIDDEN, &blobout); |
---|
67 | if (crypted) |
---|
68 | { |
---|
69 | char *coded = apr_palloc(pool, apr_base64_encode_len(blobout.cbData)); |
---|
70 | apr_base64_encode(coded, blobout.pbData, blobout.cbData); |
---|
71 | crypted = svn_auth__simple_password_set(creds, realmstring, username, |
---|
72 | coded, parameters, |
---|
73 | non_interactive, pool); |
---|
74 | LocalFree(blobout.pbData); |
---|
75 | } |
---|
76 | |
---|
77 | return crypted; |
---|
78 | } |
---|
79 | |
---|
80 | /* Implementation of svn_auth__password_get_t that decrypts |
---|
81 | the incoming password using the Windows CryptoAPI and verifies its |
---|
82 | validity. */ |
---|
83 | static svn_boolean_t |
---|
84 | windows_password_decrypter(const char **out, |
---|
85 | apr_hash_t *creds, |
---|
86 | const char *realmstring, |
---|
87 | const char *username, |
---|
88 | apr_hash_t *parameters, |
---|
89 | svn_boolean_t non_interactive, |
---|
90 | apr_pool_t *pool) |
---|
91 | { |
---|
92 | DATA_BLOB blobin; |
---|
93 | DATA_BLOB blobout; |
---|
94 | LPWSTR descr; |
---|
95 | svn_boolean_t decrypted; |
---|
96 | char *in; |
---|
97 | |
---|
98 | if (!svn_auth__simple_password_get(&in, creds, realmstring, username, |
---|
99 | parameters, non_interactive, pool)) |
---|
100 | return FALSE; |
---|
101 | |
---|
102 | blobin.cbData = strlen(in); |
---|
103 | blobin.pbData = apr_palloc(pool, apr_base64_decode_len(in)); |
---|
104 | apr_base64_decode(blobin.pbData, in); |
---|
105 | decrypted = CryptUnprotectData(&blobin, &descr, NULL, NULL, NULL, |
---|
106 | CRYPTPROTECT_UI_FORBIDDEN, &blobout); |
---|
107 | if (decrypted) |
---|
108 | { |
---|
109 | if (0 == lstrcmpW(descr, description)) |
---|
110 | *out = apr_pstrndup(pool, blobout.pbData, blobout.cbData); |
---|
111 | else |
---|
112 | decrypted = FALSE; |
---|
113 | LocalFree(blobout.pbData); |
---|
114 | LocalFree(descr); |
---|
115 | } |
---|
116 | |
---|
117 | return decrypted; |
---|
118 | } |
---|
119 | |
---|
120 | /* Get cached encrypted credentials from the simple provider's cache. */ |
---|
121 | static svn_error_t * |
---|
122 | windows_simple_first_creds(void **credentials, |
---|
123 | void **iter_baton, |
---|
124 | void *provider_baton, |
---|
125 | apr_hash_t *parameters, |
---|
126 | const char *realmstring, |
---|
127 | apr_pool_t *pool) |
---|
128 | { |
---|
129 | return svn_auth__simple_first_creds_helper(credentials, |
---|
130 | iter_baton, |
---|
131 | provider_baton, |
---|
132 | parameters, |
---|
133 | realmstring, |
---|
134 | windows_password_decrypter, |
---|
135 | SVN_AUTH__WINCRYPT_PASSWORD_TYPE, |
---|
136 | pool); |
---|
137 | } |
---|
138 | |
---|
139 | /* Save encrypted credentials to the simple provider's cache. */ |
---|
140 | static svn_error_t * |
---|
141 | windows_simple_save_creds(svn_boolean_t *saved, |
---|
142 | void *credentials, |
---|
143 | void *provider_baton, |
---|
144 | apr_hash_t *parameters, |
---|
145 | const char *realmstring, |
---|
146 | apr_pool_t *pool) |
---|
147 | { |
---|
148 | return svn_auth__simple_save_creds_helper(saved, credentials, |
---|
149 | provider_baton, |
---|
150 | parameters, |
---|
151 | realmstring, |
---|
152 | windows_password_encrypter, |
---|
153 | SVN_AUTH__WINCRYPT_PASSWORD_TYPE, |
---|
154 | pool); |
---|
155 | } |
---|
156 | |
---|
157 | static const svn_auth_provider_t windows_simple_provider = { |
---|
158 | SVN_AUTH_CRED_SIMPLE, |
---|
159 | windows_simple_first_creds, |
---|
160 | NULL, |
---|
161 | windows_simple_save_creds |
---|
162 | }; |
---|
163 | |
---|
164 | |
---|
165 | /* Public API */ |
---|
166 | void |
---|
167 | svn_auth_get_windows_simple_provider(svn_auth_provider_object_t **provider, |
---|
168 | apr_pool_t *pool) |
---|
169 | { |
---|
170 | svn_auth_provider_object_t *po = apr_pcalloc(pool, sizeof(*po)); |
---|
171 | |
---|
172 | po->vtable = &windows_simple_provider; |
---|
173 | *provider = po; |
---|
174 | } |
---|
175 | |
---|
176 | |
---|
177 | /*-----------------------------------------------------------------------*/ |
---|
178 | /* Windows SSL server trust provider, validates ssl certificate using */ |
---|
179 | /* CryptoApi. */ |
---|
180 | /*-----------------------------------------------------------------------*/ |
---|
181 | |
---|
182 | /* Implementation of svn_auth__password_set_t that encrypts |
---|
183 | the incoming password using the Windows CryptoAPI. */ |
---|
184 | static svn_boolean_t |
---|
185 | windows_ssl_client_cert_pw_encrypter(apr_hash_t *creds, |
---|
186 | const char *realmstring, |
---|
187 | const char *username, |
---|
188 | const char *in, |
---|
189 | apr_hash_t *parameters, |
---|
190 | svn_boolean_t non_interactive, |
---|
191 | apr_pool_t *pool) |
---|
192 | { |
---|
193 | DATA_BLOB blobin; |
---|
194 | DATA_BLOB blobout; |
---|
195 | svn_boolean_t crypted; |
---|
196 | |
---|
197 | blobin.cbData = strlen(in); |
---|
198 | blobin.pbData = (BYTE*) in; |
---|
199 | crypted = CryptProtectData(&blobin, description, NULL, NULL, NULL, |
---|
200 | CRYPTPROTECT_UI_FORBIDDEN, &blobout); |
---|
201 | if (crypted) |
---|
202 | { |
---|
203 | char *coded = apr_palloc(pool, apr_base64_encode_len(blobout.cbData)); |
---|
204 | apr_base64_encode(coded, blobout.pbData, blobout.cbData); |
---|
205 | crypted = svn_auth__ssl_client_cert_pw_set(creds, realmstring, username, |
---|
206 | coded, parameters, |
---|
207 | non_interactive, pool); |
---|
208 | LocalFree(blobout.pbData); |
---|
209 | } |
---|
210 | |
---|
211 | return crypted; |
---|
212 | } |
---|
213 | |
---|
214 | /* Implementation of svn_auth__password_get_t that decrypts |
---|
215 | the incoming password using the Windows CryptoAPI and verifies its |
---|
216 | validity. */ |
---|
217 | static svn_boolean_t |
---|
218 | windows_ssl_client_cert_pw_decrypter(const char **out, |
---|
219 | apr_hash_t *creds, |
---|
220 | const char *realmstring, |
---|
221 | const char *username, |
---|
222 | apr_hash_t *parameters, |
---|
223 | svn_boolean_t non_interactive, |
---|
224 | apr_pool_t *pool) |
---|
225 | { |
---|
226 | DATA_BLOB blobin; |
---|
227 | DATA_BLOB blobout; |
---|
228 | LPWSTR descr; |
---|
229 | svn_boolean_t decrypted; |
---|
230 | char *in; |
---|
231 | |
---|
232 | if (!svn_auth__ssl_client_cert_pw_get(&in, creds, realmstring, username, |
---|
233 | parameters, non_interactive, pool)) |
---|
234 | return FALSE; |
---|
235 | |
---|
236 | blobin.cbData = strlen(in); |
---|
237 | blobin.pbData = apr_palloc(pool, apr_base64_decode_len(in)); |
---|
238 | apr_base64_decode(blobin.pbData, in); |
---|
239 | decrypted = CryptUnprotectData(&blobin, &descr, NULL, NULL, NULL, |
---|
240 | CRYPTPROTECT_UI_FORBIDDEN, &blobout); |
---|
241 | if (decrypted) |
---|
242 | { |
---|
243 | if (0 == lstrcmpW(descr, description)) |
---|
244 | *out = apr_pstrndup(pool, blobout.pbData, blobout.cbData); |
---|
245 | else |
---|
246 | decrypted = FALSE; |
---|
247 | LocalFree(blobout.pbData); |
---|
248 | LocalFree(descr); |
---|
249 | } |
---|
250 | |
---|
251 | return decrypted; |
---|
252 | } |
---|
253 | |
---|
254 | /* Get cached encrypted credentials from the simple provider's cache. */ |
---|
255 | static svn_error_t * |
---|
256 | windows_ssl_client_cert_pw_first_creds(void **credentials, |
---|
257 | void **iter_baton, |
---|
258 | void *provider_baton, |
---|
259 | apr_hash_t *parameters, |
---|
260 | const char *realmstring, |
---|
261 | apr_pool_t *pool) |
---|
262 | { |
---|
263 | return svn_auth__ssl_client_cert_pw_file_first_creds_helper |
---|
264 | (credentials, |
---|
265 | iter_baton, |
---|
266 | provider_baton, |
---|
267 | parameters, |
---|
268 | realmstring, |
---|
269 | windows_ssl_client_cert_pw_decrypter, |
---|
270 | SVN_AUTH__WINCRYPT_PASSWORD_TYPE, |
---|
271 | pool); |
---|
272 | } |
---|
273 | |
---|
274 | /* Save encrypted credentials to the simple provider's cache. */ |
---|
275 | static svn_error_t * |
---|
276 | windows_ssl_client_cert_pw_save_creds(svn_boolean_t *saved, |
---|
277 | void *credentials, |
---|
278 | void *provider_baton, |
---|
279 | apr_hash_t *parameters, |
---|
280 | const char *realmstring, |
---|
281 | apr_pool_t *pool) |
---|
282 | { |
---|
283 | return svn_auth__ssl_client_cert_pw_file_save_creds_helper |
---|
284 | (saved, |
---|
285 | credentials, |
---|
286 | provider_baton, |
---|
287 | parameters, |
---|
288 | realmstring, |
---|
289 | windows_ssl_client_cert_pw_encrypter, |
---|
290 | SVN_AUTH__WINCRYPT_PASSWORD_TYPE, |
---|
291 | pool); |
---|
292 | } |
---|
293 | |
---|
294 | static const svn_auth_provider_t windows_ssl_client_cert_pw_provider = { |
---|
295 | SVN_AUTH_CRED_SSL_CLIENT_CERT_PW, |
---|
296 | windows_ssl_client_cert_pw_first_creds, |
---|
297 | NULL, |
---|
298 | windows_ssl_client_cert_pw_save_creds |
---|
299 | }; |
---|
300 | |
---|
301 | |
---|
302 | /* Public API */ |
---|
303 | void |
---|
304 | svn_auth_get_windows_ssl_client_cert_pw_provider |
---|
305 | (svn_auth_provider_object_t **provider, |
---|
306 | apr_pool_t *pool) |
---|
307 | { |
---|
308 | svn_auth_provider_object_t *po = apr_pcalloc(pool, sizeof(*po)); |
---|
309 | |
---|
310 | po->vtable = &windows_ssl_client_cert_pw_provider; |
---|
311 | *provider = po; |
---|
312 | } |
---|
313 | |
---|
314 | |
---|
315 | /*-----------------------------------------------------------------------*/ |
---|
316 | /* Windows SSL server trust provider, validates ssl certificate using */ |
---|
317 | /* CryptoApi. */ |
---|
318 | /*-----------------------------------------------------------------------*/ |
---|
319 | |
---|
320 | /* Helper for windows_ssl_server_trust_first_credentials for validating |
---|
321 | * certificate using CryptoApi. Sets *OK_P to TRUE if base64 encoded ASCII_CERT |
---|
322 | * certificate considered as valid. |
---|
323 | */ |
---|
324 | static svn_error_t * |
---|
325 | windows_validate_certificate(svn_boolean_t *ok_p, |
---|
326 | const char *ascii_cert, |
---|
327 | apr_pool_t *pool) |
---|
328 | { |
---|
329 | PCCERT_CONTEXT cert_context = NULL; |
---|
330 | CERT_CHAIN_PARA chain_para; |
---|
331 | PCCERT_CHAIN_CONTEXT chain_context = NULL; |
---|
332 | int cert_len; |
---|
333 | char *binary_cert; |
---|
334 | |
---|
335 | *ok_p = FALSE; |
---|
336 | |
---|
337 | /* Use apr-util as CryptStringToBinaryA is available only on XP+. */ |
---|
338 | binary_cert = apr_palloc(pool, |
---|
339 | apr_base64_decode_len(ascii_cert)); |
---|
340 | cert_len = apr_base64_decode(binary_cert, ascii_cert); |
---|
341 | |
---|
342 | /* Parse the certificate into a context. */ |
---|
343 | cert_context = CertCreateCertificateContext |
---|
344 | (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, binary_cert, cert_len); |
---|
345 | |
---|
346 | if (cert_context) |
---|
347 | { |
---|
348 | /* Retrieve the certificate chain of the certificate |
---|
349 | (a certificate without a valid root does not have a chain). */ |
---|
350 | memset(&chain_para, 0, sizeof(chain_para)); |
---|
351 | chain_para.cbSize = sizeof(chain_para); |
---|
352 | |
---|
353 | if (CertGetCertificateChain(NULL, cert_context, NULL, NULL, &chain_para, |
---|
354 | CERT_CHAIN_CACHE_END_CERT, |
---|
355 | NULL, &chain_context)) |
---|
356 | { |
---|
357 | if (chain_context->rgpChain[0]->TrustStatus.dwErrorStatus |
---|
358 | == CERT_TRUST_NO_ERROR) |
---|
359 | { |
---|
360 | /* Windows think the certificate is valid. */ |
---|
361 | *ok_p = TRUE; |
---|
362 | } |
---|
363 | |
---|
364 | CertFreeCertificateChain(chain_context); |
---|
365 | } |
---|
366 | CertFreeCertificateContext(cert_context); |
---|
367 | } |
---|
368 | |
---|
369 | return SVN_NO_ERROR; |
---|
370 | } |
---|
371 | |
---|
372 | /* Retrieve ssl server CA failure overrides (if any) from CryptoApi. */ |
---|
373 | static svn_error_t * |
---|
374 | windows_ssl_server_trust_first_credentials(void **credentials, |
---|
375 | void **iter_baton, |
---|
376 | void *provider_baton, |
---|
377 | apr_hash_t *parameters, |
---|
378 | const char *realmstring, |
---|
379 | apr_pool_t *pool) |
---|
380 | { |
---|
381 | apr_uint32_t *failures = apr_hash_get(parameters, |
---|
382 | SVN_AUTH_PARAM_SSL_SERVER_FAILURES, |
---|
383 | APR_HASH_KEY_STRING); |
---|
384 | const svn_auth_ssl_server_cert_info_t *cert_info = |
---|
385 | apr_hash_get(parameters, |
---|
386 | SVN_AUTH_PARAM_SSL_SERVER_CERT_INFO, |
---|
387 | APR_HASH_KEY_STRING); |
---|
388 | |
---|
389 | *credentials = NULL; |
---|
390 | *iter_baton = NULL; |
---|
391 | |
---|
392 | /* We can accept only unknown certificate authority. */ |
---|
393 | if (*failures & SVN_AUTH_SSL_UNKNOWNCA) |
---|
394 | { |
---|
395 | svn_boolean_t ok; |
---|
396 | |
---|
397 | SVN_ERR(windows_validate_certificate(&ok, cert_info->ascii_cert, pool)); |
---|
398 | |
---|
399 | /* Windows thinks that certificate is ok. */ |
---|
400 | if (ok) |
---|
401 | { |
---|
402 | /* Clear failure flag. */ |
---|
403 | *failures &= ~SVN_AUTH_SSL_UNKNOWNCA; |
---|
404 | } |
---|
405 | } |
---|
406 | |
---|
407 | /* If all failures are cleared now, we return the creds */ |
---|
408 | if (! *failures) |
---|
409 | { |
---|
410 | svn_auth_cred_ssl_server_trust_t *creds = |
---|
411 | apr_pcalloc(pool, sizeof(*creds)); |
---|
412 | creds->may_save = FALSE; /* No need to save it. */ |
---|
413 | *credentials = creds; |
---|
414 | } |
---|
415 | |
---|
416 | return SVN_NO_ERROR; |
---|
417 | } |
---|
418 | |
---|
419 | static const svn_auth_provider_t windows_server_trust_provider = { |
---|
420 | SVN_AUTH_CRED_SSL_SERVER_TRUST, |
---|
421 | windows_ssl_server_trust_first_credentials, |
---|
422 | NULL, |
---|
423 | NULL, |
---|
424 | }; |
---|
425 | |
---|
426 | /* Public API */ |
---|
427 | void |
---|
428 | svn_auth_get_windows_ssl_server_trust_provider |
---|
429 | (svn_auth_provider_object_t **provider, apr_pool_t *pool) |
---|
430 | { |
---|
431 | svn_auth_provider_object_t *po = apr_pcalloc(pool, sizeof(*po)); |
---|
432 | |
---|
433 | po->vtable = &windows_server_trust_provider; |
---|
434 | *provider = po; |
---|
435 | } |
---|
436 | |
---|
437 | #endif /* WIN32 */ |
---|