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532616bb | 1 | /** @file\r |
2 | PKCS#7 SignedData Verification Wrapper Implementation over OpenSSL.\r | |
3 | \r | |
4 | Caution: This module requires additional review when modified.\r | |
5 | This library will have external input - signature (e.g. UEFI Authenticated\r | |
6 | Variable). It may by input in SMM mode.\r | |
7 | This external input must be validated carefully to avoid security issue like\r | |
8 | buffer overflow, integer overflow.\r | |
9 | \r | |
10 | WrapPkcs7Data(), Pkcs7GetSigners(), Pkcs7Verify() will get UEFI Authenticated\r | |
11 | Variable and will do basic check for data structure.\r | |
12 | \r | |
f56b11d2 | 13 | Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>\r |
532616bb | 14 | This program and the accompanying materials\r |
15 | are licensed and made available under the terms and conditions of the BSD License\r | |
16 | which accompanies this distribution. The full text of the license may be found at\r | |
17 | http://opensource.org/licenses/bsd-license.php\r | |
18 | \r | |
19 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
20 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
21 | \r | |
22 | **/\r | |
23 | \r | |
24 | #include "InternalCryptLib.h"\r | |
25 | \r | |
26 | #include <openssl/objects.h>\r | |
27 | #include <openssl/x509.h>\r | |
02ee8d3b | 28 | #include <openssl/x509v3.h>\r |
532616bb | 29 | #include <openssl/pkcs7.h>\r |
30 | \r | |
31 | UINT8 mOidValue[9] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02 };\r | |
32 | \r | |
532616bb | 33 | /**\r |
34 | Check input P7Data is a wrapped ContentInfo structure or not. If not construct\r | |
35 | a new structure to wrap P7Data.\r | |
36 | \r | |
37 | Caution: This function may receive untrusted input.\r | |
38 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
39 | check for PKCS#7 data structure.\r | |
40 | \r | |
41 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
42 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
43 | @param[out] WrapFlag If TRUE P7Data is a ContentInfo structure, otherwise\r | |
44 | return FALSE.\r | |
2ac68e8b | 45 | @param[out] WrapData If return status of this function is TRUE:\r |
532616bb | 46 | 1) when WrapFlag is TRUE, pointer to P7Data.\r |
47 | 2) when WrapFlag is FALSE, pointer to a new ContentInfo\r | |
48 | structure. It's caller's responsibility to free this\r | |
49 | buffer.\r | |
50 | @param[out] WrapDataSize Length of ContentInfo structure in bytes.\r | |
51 | \r | |
52 | @retval TRUE The operation is finished successfully.\r | |
53 | @retval FALSE The operation is failed due to lack of resources.\r | |
54 | \r | |
55 | **/\r | |
56 | BOOLEAN\r | |
57 | WrapPkcs7Data (\r | |
58 | IN CONST UINT8 *P7Data,\r | |
59 | IN UINTN P7Length,\r | |
60 | OUT BOOLEAN *WrapFlag,\r | |
61 | OUT UINT8 **WrapData,\r | |
62 | OUT UINTN *WrapDataSize\r | |
63 | )\r | |
64 | {\r | |
65 | BOOLEAN Wrapped;\r | |
66 | UINT8 *SignedData;\r | |
67 | \r | |
68 | //\r | |
69 | // Check whether input P7Data is a wrapped ContentInfo structure or not.\r | |
70 | //\r | |
71 | Wrapped = FALSE;\r | |
72 | if ((P7Data[4] == 0x06) && (P7Data[5] == 0x09)) {\r | |
73 | if (CompareMem (P7Data + 6, mOidValue, sizeof (mOidValue)) == 0) {\r | |
74 | if ((P7Data[15] == 0xA0) && (P7Data[16] == 0x82)) {\r | |
75 | Wrapped = TRUE;\r | |
76 | }\r | |
77 | }\r | |
78 | }\r | |
79 | \r | |
80 | if (Wrapped) {\r | |
81 | *WrapData = (UINT8 *) P7Data;\r | |
82 | *WrapDataSize = P7Length;\r | |
83 | } else {\r | |
84 | //\r | |
85 | // Wrap PKCS#7 signeddata to a ContentInfo structure - add a header in 19 bytes.\r | |
86 | //\r | |
87 | *WrapDataSize = P7Length + 19;\r | |
88 | *WrapData = malloc (*WrapDataSize);\r | |
89 | if (*WrapData == NULL) {\r | |
90 | *WrapFlag = Wrapped;\r | |
91 | return FALSE;\r | |
92 | }\r | |
93 | \r | |
94 | SignedData = *WrapData;\r | |
95 | \r | |
96 | //\r | |
97 | // Part1: 0x30, 0x82.\r | |
98 | //\r | |
99 | SignedData[0] = 0x30;\r | |
100 | SignedData[1] = 0x82;\r | |
101 | \r | |
102 | //\r | |
103 | // Part2: Length1 = P7Length + 19 - 4, in big endian.\r | |
104 | //\r | |
105 | SignedData[2] = (UINT8) (((UINT16) (*WrapDataSize - 4)) >> 8);\r | |
106 | SignedData[3] = (UINT8) (((UINT16) (*WrapDataSize - 4)) & 0xff);\r | |
107 | \r | |
108 | //\r | |
109 | // Part3: 0x06, 0x09.\r | |
110 | //\r | |
111 | SignedData[4] = 0x06;\r | |
112 | SignedData[5] = 0x09;\r | |
113 | \r | |
114 | //\r | |
115 | // Part4: OID value -- 0x2A 0x86 0x48 0x86 0xF7 0x0D 0x01 0x07 0x02.\r | |
116 | //\r | |
117 | CopyMem (SignedData + 6, mOidValue, sizeof (mOidValue));\r | |
118 | \r | |
119 | //\r | |
120 | // Part5: 0xA0, 0x82.\r | |
121 | //\r | |
122 | SignedData[15] = 0xA0;\r | |
123 | SignedData[16] = 0x82;\r | |
124 | \r | |
125 | //\r | |
126 | // Part6: Length2 = P7Length, in big endian.\r | |
127 | //\r | |
128 | SignedData[17] = (UINT8) (((UINT16) P7Length) >> 8);\r | |
129 | SignedData[18] = (UINT8) (((UINT16) P7Length) & 0xff);\r | |
130 | \r | |
131 | //\r | |
132 | // Part7: P7Data.\r | |
133 | //\r | |
134 | CopyMem (SignedData + 19, P7Data, P7Length);\r | |
135 | }\r | |
136 | \r | |
137 | *WrapFlag = Wrapped;\r | |
138 | return TRUE;\r | |
139 | }\r | |
140 | \r | |
efad60c5 | 141 | /**\r |
142 | Pop single certificate from STACK_OF(X509).\r | |
143 | \r | |
144 | If X509Stack, Cert, or CertSize is NULL, then return FALSE.\r | |
145 | \r | |
146 | @param[in] X509Stack Pointer to a X509 stack object.\r | |
147 | @param[out] Cert Pointer to a X509 certificate.\r | |
148 | @param[out] CertSize Length of output X509 certificate in bytes.\r | |
2ac68e8b | 149 | \r |
efad60c5 | 150 | @retval TRUE The X509 stack pop succeeded.\r |
151 | @retval FALSE The pop operation failed.\r | |
152 | \r | |
153 | **/\r | |
154 | BOOLEAN\r | |
155 | X509PopCertificate (\r | |
156 | IN VOID *X509Stack,\r | |
157 | OUT UINT8 **Cert,\r | |
158 | OUT UINTN *CertSize\r | |
159 | )\r | |
160 | {\r | |
161 | BIO *CertBio;\r | |
162 | X509 *X509Cert;\r | |
163 | STACK_OF(X509) *CertStack;\r | |
164 | BOOLEAN Status;\r | |
eb58f559 | 165 | INT32 Result;\r |
f56b11d2 | 166 | BUF_MEM *Ptr;\r |
eb58f559 | 167 | INT32 Length;\r |
efad60c5 | 168 | VOID *Buffer;\r |
169 | \r | |
170 | Status = FALSE;\r | |
171 | \r | |
172 | if ((X509Stack == NULL) || (Cert == NULL) || (CertSize == NULL)) {\r | |
173 | return Status;\r | |
174 | }\r | |
175 | \r | |
176 | CertStack = (STACK_OF(X509) *) X509Stack;\r | |
177 | \r | |
178 | X509Cert = sk_X509_pop (CertStack);\r | |
179 | \r | |
180 | if (X509Cert == NULL) {\r | |
181 | return Status;\r | |
182 | }\r | |
183 | \r | |
184 | Buffer = NULL;\r | |
185 | \r | |
186 | CertBio = BIO_new (BIO_s_mem ());\r | |
187 | if (CertBio == NULL) {\r | |
188 | return Status;\r | |
189 | }\r | |
190 | \r | |
191 | Result = i2d_X509_bio (CertBio, X509Cert);\r | |
192 | if (Result == 0) {\r | |
193 | goto _Exit;\r | |
194 | }\r | |
195 | \r | |
f56b11d2 QL |
196 | BIO_get_mem_ptr (CertBio, &Ptr);\r |
197 | Length = (INT32)(Ptr->length);\r | |
efad60c5 | 198 | if (Length <= 0) {\r |
199 | goto _Exit;\r | |
200 | }\r | |
201 | \r | |
202 | Buffer = malloc (Length);\r | |
203 | if (Buffer == NULL) {\r | |
204 | goto _Exit;\r | |
205 | }\r | |
206 | \r | |
207 | Result = BIO_read (CertBio, Buffer, Length);\r | |
208 | if (Result != Length) {\r | |
209 | goto _Exit;\r | |
210 | }\r | |
211 | \r | |
212 | *Cert = Buffer;\r | |
213 | *CertSize = Length;\r | |
214 | \r | |
215 | Status = TRUE;\r | |
216 | \r | |
217 | _Exit:\r | |
218 | \r | |
219 | BIO_free (CertBio);\r | |
220 | \r | |
221 | if (!Status && (Buffer != NULL)) {\r | |
222 | free (Buffer);\r | |
223 | }\r | |
224 | \r | |
225 | return Status;\r | |
226 | }\r | |
227 | \r | |
532616bb | 228 | /**\r |
229 | Get the signer's certificates from PKCS#7 signed data as described in "PKCS #7:\r | |
230 | Cryptographic Message Syntax Standard". The input signed data could be wrapped\r | |
231 | in a ContentInfo structure.\r | |
232 | \r | |
233 | If P7Data, CertStack, StackLength, TrustedCert or CertLength is NULL, then\r | |
2998af86 | 234 | return FALSE. If P7Length overflow, then return FALSE.\r |
532616bb | 235 | \r |
236 | Caution: This function may receive untrusted input.\r | |
237 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
238 | check for PKCS#7 data structure.\r | |
239 | \r | |
240 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
241 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
242 | @param[out] CertStack Pointer to Signer's certificates retrieved from P7Data.\r | |
210abffd | 243 | It's caller's responsibility to free the buffer.\r |
532616bb | 244 | @param[out] StackLength Length of signer's certificates in bytes.\r |
245 | @param[out] TrustedCert Pointer to a trusted certificate from Signer's certificates.\r | |
210abffd | 246 | It's caller's responsibility to free the buffer.\r |
532616bb | 247 | @param[out] CertLength Length of the trusted certificate in bytes.\r |
248 | \r | |
249 | @retval TRUE The operation is finished successfully.\r | |
250 | @retval FALSE Error occurs during the operation.\r | |
251 | \r | |
252 | **/\r | |
253 | BOOLEAN\r | |
254 | EFIAPI\r | |
255 | Pkcs7GetSigners (\r | |
256 | IN CONST UINT8 *P7Data,\r | |
257 | IN UINTN P7Length,\r | |
258 | OUT UINT8 **CertStack,\r | |
259 | OUT UINTN *StackLength,\r | |
260 | OUT UINT8 **TrustedCert,\r | |
261 | OUT UINTN *CertLength\r | |
262 | )\r | |
263 | {\r | |
264 | PKCS7 *Pkcs7;\r | |
265 | BOOLEAN Status;\r | |
266 | UINT8 *SignedData;\r | |
1463ce18 | 267 | CONST UINT8 *Temp;\r |
532616bb | 268 | UINTN SignedDataSize;\r |
269 | BOOLEAN Wrapped;\r | |
270 | STACK_OF(X509) *Stack;\r | |
271 | UINT8 Index;\r | |
272 | UINT8 *CertBuf;\r | |
273 | UINT8 *OldBuf;\r | |
274 | UINTN BufferSize;\r | |
275 | UINTN OldSize;\r | |
276 | UINT8 *SingleCert;\r | |
277 | UINTN SingleCertSize;\r | |
278 | \r | |
279 | if ((P7Data == NULL) || (CertStack == NULL) || (StackLength == NULL) ||\r | |
280 | (TrustedCert == NULL) || (CertLength == NULL) || (P7Length > INT_MAX)) {\r | |
281 | return FALSE;\r | |
282 | }\r | |
2ac68e8b | 283 | \r |
532616bb | 284 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);\r |
285 | if (!Status) {\r | |
286 | return Status;\r | |
287 | }\r | |
288 | \r | |
289 | Status = FALSE;\r | |
290 | Pkcs7 = NULL;\r | |
291 | Stack = NULL;\r | |
292 | CertBuf = NULL;\r | |
293 | OldBuf = NULL;\r | |
294 | SingleCert = NULL;\r | |
295 | \r | |
296 | //\r | |
297 | // Retrieve PKCS#7 Data (DER encoding)\r | |
298 | //\r | |
299 | if (SignedDataSize > INT_MAX) {\r | |
300 | goto _Exit;\r | |
301 | }\r | |
302 | \r | |
303 | Temp = SignedData;\r | |
304 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &Temp, (int) SignedDataSize);\r | |
305 | if (Pkcs7 == NULL) {\r | |
306 | goto _Exit;\r | |
307 | }\r | |
308 | \r | |
309 | //\r | |
310 | // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)\r | |
311 | //\r | |
312 | if (!PKCS7_type_is_signed (Pkcs7)) {\r | |
313 | goto _Exit;\r | |
314 | }\r | |
315 | \r | |
316 | Stack = PKCS7_get0_signers(Pkcs7, NULL, PKCS7_BINARY);\r | |
317 | if (Stack == NULL) {\r | |
318 | goto _Exit;\r | |
319 | }\r | |
320 | \r | |
321 | //\r | |
322 | // Convert CertStack to buffer in following format:\r | |
323 | // UINT8 CertNumber;\r | |
324 | // UINT32 Cert1Length;\r | |
325 | // UINT8 Cert1[];\r | |
326 | // UINT32 Cert2Length;\r | |
327 | // UINT8 Cert2[];\r | |
328 | // ...\r | |
329 | // UINT32 CertnLength;\r | |
330 | // UINT8 Certn[];\r | |
331 | //\r | |
332 | BufferSize = sizeof (UINT8);\r | |
333 | OldSize = BufferSize;\r | |
2ac68e8b | 334 | \r |
532616bb | 335 | for (Index = 0; ; Index++) {\r |
336 | Status = X509PopCertificate (Stack, &SingleCert, &SingleCertSize);\r | |
337 | if (!Status) {\r | |
338 | break;\r | |
339 | }\r | |
340 | \r | |
341 | OldSize = BufferSize;\r | |
342 | OldBuf = CertBuf;\r | |
343 | BufferSize = OldSize + SingleCertSize + sizeof (UINT32);\r | |
344 | CertBuf = malloc (BufferSize);\r | |
345 | \r | |
346 | if (CertBuf == NULL) {\r | |
347 | goto _Exit;\r | |
348 | }\r | |
349 | \r | |
350 | if (OldBuf != NULL) {\r | |
351 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
352 | free (OldBuf);\r | |
353 | OldBuf = NULL;\r | |
354 | }\r | |
355 | \r | |
356 | WriteUnaligned32 ((UINT32 *) (CertBuf + OldSize), (UINT32) SingleCertSize);\r | |
357 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, SingleCertSize);\r | |
358 | \r | |
359 | free (SingleCert);\r | |
360 | SingleCert = NULL;\r | |
361 | }\r | |
362 | \r | |
363 | if (CertBuf != NULL) {\r | |
364 | //\r | |
365 | // Update CertNumber.\r | |
366 | //\r | |
367 | CertBuf[0] = Index;\r | |
368 | \r | |
369 | *CertLength = BufferSize - OldSize - sizeof (UINT32);\r | |
370 | *TrustedCert = malloc (*CertLength);\r | |
371 | if (*TrustedCert == NULL) {\r | |
372 | goto _Exit;\r | |
373 | }\r | |
374 | \r | |
375 | CopyMem (*TrustedCert, CertBuf + OldSize + sizeof (UINT32), *CertLength);\r | |
376 | *CertStack = CertBuf;\r | |
377 | *StackLength = BufferSize;\r | |
378 | Status = TRUE;\r | |
2ac68e8b | 379 | }\r |
532616bb | 380 | \r |
381 | _Exit:\r | |
382 | //\r | |
383 | // Release Resources\r | |
384 | //\r | |
385 | if (!Wrapped) {\r | |
386 | free (SignedData);\r | |
387 | }\r | |
388 | \r | |
389 | if (Pkcs7 != NULL) {\r | |
390 | PKCS7_free (Pkcs7);\r | |
391 | }\r | |
392 | \r | |
393 | if (Stack != NULL) {\r | |
394 | sk_X509_pop_free(Stack, X509_free);\r | |
395 | }\r | |
396 | \r | |
397 | if (SingleCert != NULL) {\r | |
398 | free (SingleCert);\r | |
399 | }\r | |
400 | \r | |
401 | if (!Status && (CertBuf != NULL)) {\r | |
402 | free (CertBuf);\r | |
403 | *CertStack = NULL;\r | |
404 | }\r | |
405 | \r | |
406 | if (OldBuf != NULL) {\r | |
407 | free (OldBuf);\r | |
408 | }\r | |
2ac68e8b | 409 | \r |
532616bb | 410 | return Status;\r |
411 | }\r | |
412 | \r | |
413 | /**\r | |
414 | Wrap function to use free() to free allocated memory for certificates.\r | |
415 | \r | |
416 | @param[in] Certs Pointer to the certificates to be freed.\r | |
417 | \r | |
418 | **/\r | |
419 | VOID\r | |
420 | EFIAPI\r | |
421 | Pkcs7FreeSigners (\r | |
422 | IN UINT8 *Certs\r | |
423 | )\r | |
424 | {\r | |
425 | if (Certs == NULL) {\r | |
426 | return;\r | |
427 | }\r | |
428 | \r | |
429 | free (Certs);\r | |
430 | }\r | |
431 | \r | |
45419de6 QL |
432 | /**\r |
433 | Retrieves all embedded certificates from PKCS#7 signed data as described in "PKCS #7:\r | |
434 | Cryptographic Message Syntax Standard", and outputs two certificate lists chained and\r | |
435 | unchained to the signer's certificates.\r | |
436 | The input signed data could be wrapped in a ContentInfo structure.\r | |
437 | \r | |
438 | @param[in] P7Data Pointer to the PKCS#7 message.\r | |
439 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
0f5f6b3d | 440 | @param[out] SignerChainCerts Pointer to the certificates list chained to signer's\r |
210abffd | 441 | certificate. It's caller's responsibility to free the buffer.\r |
45419de6 QL |
442 | @param[out] ChainLength Length of the chained certificates list buffer in bytes.\r |
443 | @param[out] UnchainCerts Pointer to the unchained certificates lists. It's caller's\r | |
210abffd | 444 | responsibility to free the buffer.\r |
45419de6 QL |
445 | @param[out] UnchainLength Length of the unchained certificates list buffer in bytes.\r |
446 | \r | |
447 | @retval TRUE The operation is finished successfully.\r | |
448 | @retval FALSE Error occurs during the operation.\r | |
449 | \r | |
450 | **/\r | |
451 | BOOLEAN\r | |
452 | EFIAPI\r | |
453 | Pkcs7GetCertificatesList (\r | |
454 | IN CONST UINT8 *P7Data,\r | |
455 | IN UINTN P7Length,\r | |
456 | OUT UINT8 **SignerChainCerts,\r | |
457 | OUT UINTN *ChainLength,\r | |
458 | OUT UINT8 **UnchainCerts,\r | |
459 | OUT UINTN *UnchainLength\r | |
460 | )\r | |
461 | {\r | |
462 | BOOLEAN Status;\r | |
463 | UINT8 *NewP7Data;\r | |
464 | UINTN NewP7Length;\r | |
465 | BOOLEAN Wrapped;\r | |
466 | UINT8 Index;\r | |
467 | PKCS7 *Pkcs7;\r | |
f56b11d2 QL |
468 | X509_STORE_CTX *CertCtx;\r |
469 | STACK_OF(X509) *CtxChain;\r | |
470 | STACK_OF(X509) *CtxUntrusted;\r | |
471 | X509 *CtxCert;\r | |
45419de6 QL |
472 | STACK_OF(X509) *Signers;\r |
473 | X509 *Signer;\r | |
474 | X509 *Cert;\r | |
45419de6 | 475 | X509 *Issuer;\r |
f56b11d2 | 476 | X509_NAME *IssuerName;\r |
45419de6 QL |
477 | UINT8 *CertBuf;\r |
478 | UINT8 *OldBuf;\r | |
479 | UINTN BufferSize;\r | |
480 | UINTN OldSize;\r | |
481 | UINT8 *SingleCert;\r | |
482 | UINTN CertSize;\r | |
483 | \r | |
484 | //\r | |
485 | // Initializations\r | |
486 | //\r | |
487 | Status = FALSE;\r | |
488 | NewP7Data = NULL;\r | |
489 | Pkcs7 = NULL;\r | |
f56b11d2 QL |
490 | CertCtx = NULL;\r |
491 | CtxChain = NULL;\r | |
492 | CtxCert = NULL;\r | |
493 | CtxUntrusted = NULL;\r | |
45419de6 | 494 | Cert = NULL;\r |
45419de6 QL |
495 | SingleCert = NULL;\r |
496 | CertBuf = NULL;\r | |
497 | OldBuf = NULL;\r | |
498 | Signers = NULL;\r | |
499 | \r | |
07cae065 HW |
500 | ZeroMem (&CertCtx, sizeof (CertCtx));\r |
501 | \r | |
45419de6 QL |
502 | //\r |
503 | // Parameter Checking\r | |
504 | //\r | |
505 | if ((P7Data == NULL) || (SignerChainCerts == NULL) || (ChainLength == NULL) ||\r | |
506 | (UnchainCerts == NULL) || (UnchainLength == NULL) || (P7Length > INT_MAX)) {\r | |
507 | return Status;\r | |
508 | }\r | |
509 | \r | |
510 | *SignerChainCerts = NULL;\r | |
511 | *ChainLength = 0;\r | |
512 | *UnchainCerts = NULL;\r | |
513 | *UnchainLength = 0;\r | |
514 | \r | |
515 | //\r | |
516 | // Construct a new PKCS#7 data wrapping with ContentInfo structure if needed.\r | |
517 | //\r | |
518 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &NewP7Data, &NewP7Length);\r | |
519 | if (!Status || (NewP7Length > INT_MAX)) {\r | |
520 | goto _Error;\r | |
521 | }\r | |
522 | \r | |
523 | //\r | |
524 | // Decodes PKCS#7 SignedData\r | |
525 | //\r | |
526 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &NewP7Data, (int) NewP7Length);\r | |
527 | if ((Pkcs7 == NULL) || (!PKCS7_type_is_signed (Pkcs7))) {\r | |
528 | goto _Error;\r | |
529 | }\r | |
530 | \r | |
531 | //\r | |
532 | // Obtains Signer's Certificate from PKCS#7 data\r | |
533 | // NOTE: Only one signer case will be handled in this function, which means SignerInfos\r | |
0f5f6b3d | 534 | // should include only one signer's certificate.\r |
45419de6 QL |
535 | //\r |
536 | Signers = PKCS7_get0_signers (Pkcs7, NULL, PKCS7_BINARY);\r | |
537 | if ((Signers == NULL) || (sk_X509_num (Signers) != 1)) {\r | |
538 | goto _Error;\r | |
539 | }\r | |
540 | Signer = sk_X509_value (Signers, 0);\r | |
541 | \r | |
f56b11d2 QL |
542 | CertCtx = X509_STORE_CTX_new ();\r |
543 | if (CertCtx == NULL) {\r | |
544 | goto _Error;\r | |
545 | }\r | |
546 | if (!X509_STORE_CTX_init (CertCtx, NULL, Signer, Pkcs7->d.sign->cert)) {\r | |
45419de6 QL |
547 | goto _Error;\r |
548 | }\r | |
549 | //\r | |
550 | // Initialize Chained & Untrusted stack\r | |
551 | //\r | |
f56b11d2 QL |
552 | CtxChain = X509_STORE_CTX_get0_chain (CertCtx);\r |
553 | CtxCert = X509_STORE_CTX_get0_cert (CertCtx);\r | |
554 | if (CtxChain == NULL) {\r | |
555 | if (((CtxChain = sk_X509_new_null ()) == NULL) ||\r | |
556 | (!sk_X509_push (CtxChain, CtxCert))) {\r | |
45419de6 QL |
557 | goto _Error;\r |
558 | }\r | |
559 | }\r | |
f56b11d2 QL |
560 | CtxUntrusted = X509_STORE_CTX_get0_untrusted (CertCtx);\r |
561 | (VOID)sk_X509_delete_ptr (CtxUntrusted, Signer);\r | |
45419de6 QL |
562 | \r |
563 | //\r | |
564 | // Build certificates stack chained from Signer's certificate.\r | |
565 | //\r | |
566 | Cert = Signer;\r | |
567 | for (; ;) {\r | |
568 | //\r | |
569 | // Self-Issue checking\r | |
570 | //\r | |
f56b11d2 QL |
571 | Issuer = NULL;\r |
572 | if (X509_STORE_CTX_get1_issuer (&Issuer, CertCtx, Cert) == 1) {\r | |
573 | if (X509_cmp (Issuer, Cert) == 0) {\r | |
574 | break;\r | |
575 | }\r | |
45419de6 QL |
576 | }\r |
577 | \r | |
578 | //\r | |
579 | // Found the issuer of the current certificate\r | |
580 | //\r | |
f56b11d2 | 581 | if (CtxUntrusted != NULL) {\r |
45419de6 | 582 | Issuer = NULL;\r |
f56b11d2 QL |
583 | IssuerName = X509_get_issuer_name (Cert);\r |
584 | Issuer = X509_find_by_subject (CtxUntrusted, IssuerName);\r | |
45419de6 | 585 | if (Issuer != NULL) {\r |
f56b11d2 | 586 | if (!sk_X509_push (CtxChain, Issuer)) {\r |
45419de6 QL |
587 | goto _Error;\r |
588 | }\r | |
f56b11d2 | 589 | (VOID)sk_X509_delete_ptr (CtxUntrusted, Issuer);\r |
45419de6 QL |
590 | \r |
591 | Cert = Issuer;\r | |
592 | continue;\r | |
593 | }\r | |
594 | }\r | |
595 | \r | |
596 | break;\r | |
597 | }\r | |
598 | \r | |
599 | //\r | |
600 | // Converts Chained and Untrusted Certificate to Certificate Buffer in following format:\r | |
601 | // UINT8 CertNumber;\r | |
602 | // UINT32 Cert1Length;\r | |
603 | // UINT8 Cert1[];\r | |
604 | // UINT32 Cert2Length;\r | |
605 | // UINT8 Cert2[];\r | |
606 | // ...\r | |
607 | // UINT32 CertnLength;\r | |
608 | // UINT8 Certn[];\r | |
609 | //\r | |
610 | \r | |
f56b11d2 | 611 | if (CtxChain != NULL) {\r |
45419de6 QL |
612 | BufferSize = sizeof (UINT8);\r |
613 | OldSize = BufferSize;\r | |
614 | CertBuf = NULL;\r | |
615 | \r | |
616 | for (Index = 0; ; Index++) {\r | |
f56b11d2 | 617 | Status = X509PopCertificate (CtxChain, &SingleCert, &CertSize);\r |
45419de6 QL |
618 | if (!Status) {\r |
619 | break;\r | |
620 | }\r | |
621 | \r | |
622 | OldSize = BufferSize;\r | |
623 | OldBuf = CertBuf;\r | |
624 | BufferSize = OldSize + CertSize + sizeof (UINT32);\r | |
625 | CertBuf = malloc (BufferSize);\r | |
626 | \r | |
627 | if (CertBuf == NULL) {\r | |
628 | Status = FALSE;\r | |
629 | goto _Error;\r | |
630 | }\r | |
631 | if (OldBuf != NULL) {\r | |
632 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
633 | free (OldBuf);\r | |
634 | OldBuf = NULL;\r | |
635 | }\r | |
636 | \r | |
637 | WriteUnaligned32 ((UINT32 *) (CertBuf + OldSize), (UINT32) CertSize);\r | |
638 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, CertSize);\r | |
639 | \r | |
640 | free (SingleCert);\r | |
641 | SingleCert = NULL;\r | |
642 | }\r | |
643 | \r | |
644 | if (CertBuf != NULL) {\r | |
645 | //\r | |
646 | // Update CertNumber.\r | |
647 | //\r | |
648 | CertBuf[0] = Index;\r | |
649 | \r | |
650 | *SignerChainCerts = CertBuf;\r | |
651 | *ChainLength = BufferSize;\r | |
652 | }\r | |
653 | }\r | |
654 | \r | |
f56b11d2 | 655 | if (CtxUntrusted != NULL) {\r |
45419de6 QL |
656 | BufferSize = sizeof (UINT8);\r |
657 | OldSize = BufferSize;\r | |
658 | CertBuf = NULL;\r | |
659 | \r | |
660 | for (Index = 0; ; Index++) {\r | |
f56b11d2 | 661 | Status = X509PopCertificate (CtxUntrusted, &SingleCert, &CertSize);\r |
45419de6 QL |
662 | if (!Status) {\r |
663 | break;\r | |
664 | }\r | |
665 | \r | |
666 | OldSize = BufferSize;\r | |
667 | OldBuf = CertBuf;\r | |
668 | BufferSize = OldSize + CertSize + sizeof (UINT32);\r | |
669 | CertBuf = malloc (BufferSize);\r | |
670 | \r | |
671 | if (CertBuf == NULL) {\r | |
672 | Status = FALSE;\r | |
673 | goto _Error;\r | |
674 | }\r | |
675 | if (OldBuf != NULL) {\r | |
676 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
677 | free (OldBuf);\r | |
678 | OldBuf = NULL;\r | |
679 | }\r | |
680 | \r | |
681 | WriteUnaligned32 ((UINT32 *) (CertBuf + OldSize), (UINT32) CertSize);\r | |
682 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, CertSize);\r | |
683 | \r | |
684 | free (SingleCert);\r | |
685 | SingleCert = NULL;\r | |
686 | }\r | |
687 | \r | |
688 | if (CertBuf != NULL) {\r | |
689 | //\r | |
690 | // Update CertNumber.\r | |
691 | //\r | |
692 | CertBuf[0] = Index;\r | |
693 | \r | |
694 | *UnchainCerts = CertBuf;\r | |
695 | *UnchainLength = BufferSize;\r | |
696 | }\r | |
697 | }\r | |
698 | \r | |
699 | Status = TRUE;\r | |
700 | \r | |
701 | _Error:\r | |
702 | //\r | |
703 | // Release Resources.\r | |
704 | //\r | |
705 | if (!Wrapped && (NewP7Data != NULL)) {\r | |
706 | free (NewP7Data);\r | |
707 | }\r | |
708 | \r | |
709 | if (Pkcs7 != NULL) {\r | |
710 | PKCS7_free (Pkcs7);\r | |
711 | }\r | |
712 | sk_X509_free (Signers);\r | |
713 | \r | |
f56b11d2 QL |
714 | X509_STORE_CTX_cleanup (CertCtx);\r |
715 | X509_STORE_CTX_free (CertCtx);\r | |
45419de6 QL |
716 | \r |
717 | if (SingleCert != NULL) {\r | |
718 | free (SingleCert);\r | |
719 | }\r | |
720 | \r | |
721 | if (OldBuf != NULL) {\r | |
722 | free (OldBuf);\r | |
723 | }\r | |
724 | \r | |
725 | if (!Status && (CertBuf != NULL)) {\r | |
726 | free (CertBuf);\r | |
727 | *SignerChainCerts = NULL;\r | |
728 | *UnchainCerts = NULL;\r | |
729 | }\r | |
730 | \r | |
731 | return Status;\r | |
732 | }\r | |
733 | \r | |
532616bb | 734 | /**\r |
2998af86 | 735 | Verifies the validity of a PKCS#7 signed data as described in "PKCS #7:\r |
532616bb | 736 | Cryptographic Message Syntax Standard". The input signed data could be wrapped\r |
737 | in a ContentInfo structure.\r | |
738 | \r | |
739 | If P7Data, TrustedCert or InData is NULL, then return FALSE.\r | |
2998af86 | 740 | If P7Length, CertLength or DataLength overflow, then return FALSE.\r |
532616bb | 741 | \r |
742 | Caution: This function may receive untrusted input.\r | |
743 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
744 | check for PKCS#7 data structure.\r | |
745 | \r | |
746 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
747 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
748 | @param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which\r | |
749 | is used for certificate chain verification.\r | |
750 | @param[in] CertLength Length of the trusted certificate in bytes.\r | |
751 | @param[in] InData Pointer to the content to be verified.\r | |
752 | @param[in] DataLength Length of InData in bytes.\r | |
753 | \r | |
754 | @retval TRUE The specified PKCS#7 signed data is valid.\r | |
755 | @retval FALSE Invalid PKCS#7 signed data.\r | |
756 | \r | |
757 | **/\r | |
758 | BOOLEAN\r | |
759 | EFIAPI\r | |
760 | Pkcs7Verify (\r | |
761 | IN CONST UINT8 *P7Data,\r | |
762 | IN UINTN P7Length,\r | |
763 | IN CONST UINT8 *TrustedCert,\r | |
764 | IN UINTN CertLength,\r | |
765 | IN CONST UINT8 *InData,\r | |
766 | IN UINTN DataLength\r | |
767 | )\r | |
768 | {\r | |
769 | PKCS7 *Pkcs7;\r | |
532616bb | 770 | BIO *DataBio;\r |
771 | BOOLEAN Status;\r | |
772 | X509 *Cert;\r | |
773 | X509_STORE *CertStore;\r | |
774 | UINT8 *SignedData;\r | |
1463ce18 | 775 | CONST UINT8 *Temp;\r |
532616bb | 776 | UINTN SignedDataSize;\r |
777 | BOOLEAN Wrapped;\r | |
778 | \r | |
779 | //\r | |
780 | // Check input parameters.\r | |
781 | //\r | |
2ac68e8b | 782 | if (P7Data == NULL || TrustedCert == NULL || InData == NULL ||\r |
532616bb | 783 | P7Length > INT_MAX || CertLength > INT_MAX || DataLength > INT_MAX) {\r |
784 | return FALSE;\r | |
785 | }\r | |
2ac68e8b | 786 | \r |
532616bb | 787 | Pkcs7 = NULL;\r |
532616bb | 788 | DataBio = NULL;\r |
789 | Cert = NULL;\r | |
790 | CertStore = NULL;\r | |
791 | \r | |
792 | //\r | |
793 | // Register & Initialize necessary digest algorithms for PKCS#7 Handling\r | |
794 | //\r | |
dda39f3a | 795 | if (EVP_add_digest (EVP_md5 ()) == 0) {\r |
796 | return FALSE;\r | |
797 | }\r | |
798 | if (EVP_add_digest (EVP_sha1 ()) == 0) {\r | |
799 | return FALSE;\r | |
800 | }\r | |
801 | if (EVP_add_digest (EVP_sha256 ()) == 0) {\r | |
802 | return FALSE;\r | |
803 | }\r | |
2ac68e8b QL |
804 | if (EVP_add_digest (EVP_sha384 ()) == 0) {\r |
805 | return FALSE;\r | |
806 | }\r | |
807 | if (EVP_add_digest (EVP_sha512 ()) == 0) {\r | |
808 | return FALSE;\r | |
809 | }\r | |
dda39f3a | 810 | if (EVP_add_digest_alias (SN_sha1WithRSAEncryption, SN_sha1WithRSA) == 0) {\r |
811 | return FALSE;\r | |
812 | }\r | |
813 | \r | |
532616bb | 814 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);\r |
815 | if (!Status) {\r | |
816 | return Status;\r | |
817 | }\r | |
818 | \r | |
819 | Status = FALSE;\r | |
2ac68e8b | 820 | \r |
532616bb | 821 | //\r |
822 | // Retrieve PKCS#7 Data (DER encoding)\r | |
823 | //\r | |
824 | if (SignedDataSize > INT_MAX) {\r | |
825 | goto _Exit;\r | |
826 | }\r | |
827 | \r | |
828 | Temp = SignedData;\r | |
829 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &Temp, (int) SignedDataSize);\r | |
830 | if (Pkcs7 == NULL) {\r | |
831 | goto _Exit;\r | |
832 | }\r | |
833 | \r | |
834 | //\r | |
835 | // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)\r | |
836 | //\r | |
837 | if (!PKCS7_type_is_signed (Pkcs7)) {\r | |
838 | goto _Exit;\r | |
839 | }\r | |
840 | \r | |
841 | //\r | |
842 | // Read DER-encoded root certificate and Construct X509 Certificate\r | |
843 | //\r | |
1463ce18 QL |
844 | Temp = TrustedCert;\r |
845 | Cert = d2i_X509 (NULL, &Temp, (long) CertLength);\r | |
532616bb | 846 | if (Cert == NULL) {\r |
847 | goto _Exit;\r | |
848 | }\r | |
849 | \r | |
850 | //\r | |
851 | // Setup X509 Store for trusted certificate\r | |
852 | //\r | |
853 | CertStore = X509_STORE_new ();\r | |
854 | if (CertStore == NULL) {\r | |
855 | goto _Exit;\r | |
856 | }\r | |
857 | if (!(X509_STORE_add_cert (CertStore, Cert))) {\r | |
858 | goto _Exit;\r | |
859 | }\r | |
860 | \r | |
532616bb | 861 | //\r |
862 | // For generic PKCS#7 handling, InData may be NULL if the content is present\r | |
863 | // in PKCS#7 structure. So ignore NULL checking here.\r | |
864 | //\r | |
865 | DataBio = BIO_new (BIO_s_mem ());\r | |
5b2956ea YT |
866 | if (DataBio == NULL) {\r |
867 | goto _Exit;\r | |
868 | }\r | |
869 | \r | |
870 | if (BIO_write (DataBio, InData, (int) DataLength) <= 0) {\r | |
871 | goto _Exit;\r | |
872 | }\r | |
532616bb | 873 | \r |
68547181 DW |
874 | //\r |
875 | // Allow partial certificate chains, terminated by a non-self-signed but\r | |
de0408be | 876 | // still trusted intermediate certificate. Also disable time checks.\r |
68547181 | 877 | //\r |
de0408be DW |
878 | X509_STORE_set_flags (CertStore,\r |
879 | X509_V_FLAG_PARTIAL_CHAIN | X509_V_FLAG_NO_CHECK_TIME);\r | |
68547181 | 880 | \r |
02ee8d3b | 881 | //\r |
882 | // OpenSSL PKCS7 Verification by default checks for SMIME (email signing) and\r | |
883 | // doesn't support the extended key usage for Authenticode Code Signing.\r | |
884 | // Bypass the certificate purpose checking by enabling any purposes setting.\r | |
885 | //\r | |
886 | X509_STORE_set_purpose (CertStore, X509_PURPOSE_ANY);\r | |
887 | \r | |
532616bb | 888 | //\r |
889 | // Verifies the PKCS#7 signedData structure\r | |
890 | //\r | |
891 | Status = (BOOLEAN) PKCS7_verify (Pkcs7, NULL, CertStore, DataBio, NULL, PKCS7_BINARY);\r | |
892 | \r | |
893 | _Exit:\r | |
894 | //\r | |
895 | // Release Resources\r | |
896 | //\r | |
897 | BIO_free (DataBio);\r | |
532616bb | 898 | X509_free (Cert);\r |
899 | X509_STORE_free (CertStore);\r | |
900 | PKCS7_free (Pkcs7);\r | |
901 | \r | |
902 | if (!Wrapped) {\r | |
903 | OPENSSL_free (SignedData);\r | |
904 | }\r | |
905 | \r | |
906 | return Status;\r | |
afeb55e4 QL |
907 | }\r |
908 | \r | |
909 | /**\r | |
910 | Extracts the attached content from a PKCS#7 signed data if existed. The input signed\r | |
911 | data could be wrapped in a ContentInfo structure.\r | |
912 | \r | |
913 | If P7Data, Content, or ContentSize is NULL, then return FALSE. If P7Length overflow,\r | |
2998af86 | 914 | then return FALSE. If the P7Data is not correctly formatted, then return FALSE.\r |
afeb55e4 QL |
915 | \r |
916 | Caution: This function may receive untrusted input. So this function will do\r | |
917 | basic check for PKCS#7 data structure.\r | |
918 | \r | |
919 | @param[in] P7Data Pointer to the PKCS#7 signed data to process.\r | |
920 | @param[in] P7Length Length of the PKCS#7 signed data in bytes.\r | |
921 | @param[out] Content Pointer to the extracted content from the PKCS#7 signedData.\r | |
210abffd | 922 | It's caller's responsibility to free the buffer.\r |
afeb55e4 QL |
923 | @param[out] ContentSize The size of the extracted content in bytes.\r |
924 | \r | |
925 | @retval TRUE The P7Data was correctly formatted for processing.\r | |
926 | @retval FALSE The P7Data was not correctly formatted for processing.\r | |
927 | \r | |
928 | */\r | |
929 | BOOLEAN\r | |
930 | EFIAPI\r | |
931 | Pkcs7GetAttachedContent (\r | |
932 | IN CONST UINT8 *P7Data,\r | |
933 | IN UINTN P7Length,\r | |
934 | OUT VOID **Content,\r | |
935 | OUT UINTN *ContentSize\r | |
936 | )\r | |
937 | {\r | |
938 | BOOLEAN Status;\r | |
939 | PKCS7 *Pkcs7;\r | |
940 | UINT8 *SignedData;\r | |
941 | UINTN SignedDataSize;\r | |
942 | BOOLEAN Wrapped;\r | |
943 | CONST UINT8 *Temp;\r | |
944 | ASN1_OCTET_STRING *OctStr;\r | |
945 | \r | |
afeb55e4 QL |
946 | //\r |
947 | // Check input parameter.\r | |
948 | //\r | |
949 | if ((P7Data == NULL) || (P7Length > INT_MAX) || (Content == NULL) || (ContentSize == NULL)) {\r | |
950 | return FALSE;\r | |
951 | }\r | |
952 | \r | |
2aabd146 QL |
953 | *Content = NULL;\r |
954 | Pkcs7 = NULL;\r | |
955 | SignedData = NULL;\r | |
956 | OctStr = NULL;\r | |
957 | \r | |
afeb55e4 QL |
958 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);\r |
959 | if (!Status || (SignedDataSize > INT_MAX)) {\r | |
960 | goto _Exit;\r | |
961 | }\r | |
962 | \r | |
963 | Status = FALSE;\r | |
964 | \r | |
965 | //\r | |
966 | // Decoding PKCS#7 SignedData\r | |
967 | //\r | |
968 | Temp = SignedData;\r | |
969 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **)&Temp, (int)SignedDataSize);\r | |
970 | if (Pkcs7 == NULL) {\r | |
971 | goto _Exit;\r | |
972 | }\r | |
973 | \r | |
974 | //\r | |
975 | // The type of Pkcs7 must be signedData\r | |
976 | //\r | |
977 | if (!PKCS7_type_is_signed (Pkcs7)) {\r | |
978 | goto _Exit;\r | |
979 | }\r | |
980 | \r | |
981 | //\r | |
982 | // Check for detached or attached content\r | |
983 | //\r | |
984 | if (PKCS7_get_detached (Pkcs7)) {\r | |
985 | //\r | |
986 | // No Content supplied for PKCS7 detached signedData\r | |
987 | //\r | |
988 | *Content = NULL;\r | |
989 | *ContentSize = 0;\r | |
990 | } else {\r | |
991 | //\r | |
992 | // Retrieve the attached content in PKCS7 signedData\r | |
993 | //\r | |
994 | OctStr = Pkcs7->d.sign->contents->d.data;\r | |
995 | if ((OctStr->length > 0) && (OctStr->data != NULL)) {\r | |
996 | *ContentSize = OctStr->length;\r | |
997 | *Content = malloc (*ContentSize);\r | |
2aabd146 QL |
998 | if (*Content == NULL) {\r |
999 | *ContentSize = 0;\r | |
1000 | goto _Exit;\r | |
1001 | }\r | |
afeb55e4 QL |
1002 | CopyMem (*Content, OctStr->data, *ContentSize);\r |
1003 | }\r | |
1004 | }\r | |
1005 | Status = TRUE;\r | |
1006 | \r | |
1007 | _Exit:\r | |
1008 | //\r | |
1009 | // Release Resources\r | |
1010 | //\r | |
1011 | PKCS7_free (Pkcs7);\r | |
1012 | \r | |
1013 | if (!Wrapped) {\r | |
1014 | OPENSSL_free (SignedData);\r | |
1015 | }\r | |
1016 | \r | |
1017 | return Status;\r | |
1018 | }\r |