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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 | |
cc01b26e | 13 | Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>\r |
2009f6b4 | 14 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
532616bb | 15 | \r |
16 | **/\r | |
17 | \r | |
18 | #include "InternalCryptLib.h"\r | |
19 | \r | |
20 | #include <openssl/objects.h>\r | |
21 | #include <openssl/x509.h>\r | |
02ee8d3b | 22 | #include <openssl/x509v3.h>\r |
532616bb | 23 | #include <openssl/pkcs7.h>\r |
24 | \r | |
8f837243 | 25 | GLOBAL_REMOVE_IF_UNREFERENCED const UINT8 mOidValue[9] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02 };\r |
532616bb | 26 | \r |
532616bb | 27 | /**\r |
28 | Check input P7Data is a wrapped ContentInfo structure or not. If not construct\r | |
29 | a new structure to wrap P7Data.\r | |
30 | \r | |
31 | Caution: This function may receive untrusted input.\r | |
32 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
33 | check for PKCS#7 data structure.\r | |
34 | \r | |
35 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
36 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
37 | @param[out] WrapFlag If TRUE P7Data is a ContentInfo structure, otherwise\r | |
38 | return FALSE.\r | |
2ac68e8b | 39 | @param[out] WrapData If return status of this function is TRUE:\r |
532616bb | 40 | 1) when WrapFlag is TRUE, pointer to P7Data.\r |
41 | 2) when WrapFlag is FALSE, pointer to a new ContentInfo\r | |
42 | structure. It's caller's responsibility to free this\r | |
43 | buffer.\r | |
44 | @param[out] WrapDataSize Length of ContentInfo structure in bytes.\r | |
45 | \r | |
46 | @retval TRUE The operation is finished successfully.\r | |
47 | @retval FALSE The operation is failed due to lack of resources.\r | |
48 | \r | |
49 | **/\r | |
50 | BOOLEAN\r | |
51 | WrapPkcs7Data (\r | |
52 | IN CONST UINT8 *P7Data,\r | |
53 | IN UINTN P7Length,\r | |
54 | OUT BOOLEAN *WrapFlag,\r | |
55 | OUT UINT8 **WrapData,\r | |
56 | OUT UINTN *WrapDataSize\r | |
57 | )\r | |
58 | {\r | |
7c342378 MK |
59 | BOOLEAN Wrapped;\r |
60 | UINT8 *SignedData;\r | |
532616bb | 61 | \r |
62 | //\r | |
63 | // Check whether input P7Data is a wrapped ContentInfo structure or not.\r | |
64 | //\r | |
65 | Wrapped = FALSE;\r | |
66 | if ((P7Data[4] == 0x06) && (P7Data[5] == 0x09)) {\r | |
67 | if (CompareMem (P7Data + 6, mOidValue, sizeof (mOidValue)) == 0) {\r | |
68 | if ((P7Data[15] == 0xA0) && (P7Data[16] == 0x82)) {\r | |
69 | Wrapped = TRUE;\r | |
70 | }\r | |
71 | }\r | |
72 | }\r | |
73 | \r | |
74 | if (Wrapped) {\r | |
7c342378 | 75 | *WrapData = (UINT8 *)P7Data;\r |
532616bb | 76 | *WrapDataSize = P7Length;\r |
77 | } else {\r | |
78 | //\r | |
79 | // Wrap PKCS#7 signeddata to a ContentInfo structure - add a header in 19 bytes.\r | |
80 | //\r | |
81 | *WrapDataSize = P7Length + 19;\r | |
82 | *WrapData = malloc (*WrapDataSize);\r | |
83 | if (*WrapData == NULL) {\r | |
84 | *WrapFlag = Wrapped;\r | |
85 | return FALSE;\r | |
86 | }\r | |
87 | \r | |
88 | SignedData = *WrapData;\r | |
89 | \r | |
90 | //\r | |
91 | // Part1: 0x30, 0x82.\r | |
92 | //\r | |
93 | SignedData[0] = 0x30;\r | |
94 | SignedData[1] = 0x82;\r | |
95 | \r | |
96 | //\r | |
97 | // Part2: Length1 = P7Length + 19 - 4, in big endian.\r | |
98 | //\r | |
7c342378 MK |
99 | SignedData[2] = (UINT8)(((UINT16)(*WrapDataSize - 4)) >> 8);\r |
100 | SignedData[3] = (UINT8)(((UINT16)(*WrapDataSize - 4)) & 0xff);\r | |
532616bb | 101 | \r |
102 | //\r | |
103 | // Part3: 0x06, 0x09.\r | |
104 | //\r | |
105 | SignedData[4] = 0x06;\r | |
106 | SignedData[5] = 0x09;\r | |
107 | \r | |
108 | //\r | |
109 | // Part4: OID value -- 0x2A 0x86 0x48 0x86 0xF7 0x0D 0x01 0x07 0x02.\r | |
110 | //\r | |
111 | CopyMem (SignedData + 6, mOidValue, sizeof (mOidValue));\r | |
112 | \r | |
113 | //\r | |
114 | // Part5: 0xA0, 0x82.\r | |
115 | //\r | |
116 | SignedData[15] = 0xA0;\r | |
117 | SignedData[16] = 0x82;\r | |
118 | \r | |
119 | //\r | |
120 | // Part6: Length2 = P7Length, in big endian.\r | |
121 | //\r | |
7c342378 MK |
122 | SignedData[17] = (UINT8)(((UINT16)P7Length) >> 8);\r |
123 | SignedData[18] = (UINT8)(((UINT16)P7Length) & 0xff);\r | |
532616bb | 124 | \r |
125 | //\r | |
126 | // Part7: P7Data.\r | |
127 | //\r | |
128 | CopyMem (SignedData + 19, P7Data, P7Length);\r | |
129 | }\r | |
130 | \r | |
131 | *WrapFlag = Wrapped;\r | |
132 | return TRUE;\r | |
133 | }\r | |
134 | \r | |
efad60c5 | 135 | /**\r |
136 | Pop single certificate from STACK_OF(X509).\r | |
137 | \r | |
138 | If X509Stack, Cert, or CertSize is NULL, then return FALSE.\r | |
139 | \r | |
140 | @param[in] X509Stack Pointer to a X509 stack object.\r | |
141 | @param[out] Cert Pointer to a X509 certificate.\r | |
142 | @param[out] CertSize Length of output X509 certificate in bytes.\r | |
2ac68e8b | 143 | \r |
efad60c5 | 144 | @retval TRUE The X509 stack pop succeeded.\r |
145 | @retval FALSE The pop operation failed.\r | |
146 | \r | |
147 | **/\r | |
8f837243 | 148 | STATIC\r |
efad60c5 | 149 | BOOLEAN\r |
150 | X509PopCertificate (\r | |
7c342378 MK |
151 | IN VOID *X509Stack,\r |
152 | OUT UINT8 **Cert,\r | |
153 | OUT UINTN *CertSize\r | |
efad60c5 | 154 | )\r |
155 | {\r | |
7c342378 MK |
156 | BIO *CertBio;\r |
157 | X509 *X509Cert;\r | |
158 | \r | |
159 | STACK_OF (X509) *CertStack;\r | |
160 | BOOLEAN Status;\r | |
161 | INT32 Result;\r | |
162 | BUF_MEM *Ptr;\r | |
163 | INT32 Length;\r | |
164 | VOID *Buffer;\r | |
efad60c5 | 165 | \r |
166 | Status = FALSE;\r | |
167 | \r | |
168 | if ((X509Stack == NULL) || (Cert == NULL) || (CertSize == NULL)) {\r | |
169 | return Status;\r | |
170 | }\r | |
171 | \r | |
7c342378 | 172 | CertStack = (STACK_OF (X509) *) X509Stack;\r |
efad60c5 | 173 | \r |
174 | X509Cert = sk_X509_pop (CertStack);\r | |
175 | \r | |
176 | if (X509Cert == NULL) {\r | |
177 | return Status;\r | |
178 | }\r | |
179 | \r | |
180 | Buffer = NULL;\r | |
181 | \r | |
182 | CertBio = BIO_new (BIO_s_mem ());\r | |
183 | if (CertBio == NULL) {\r | |
184 | return Status;\r | |
185 | }\r | |
186 | \r | |
187 | Result = i2d_X509_bio (CertBio, X509Cert);\r | |
188 | if (Result == 0) {\r | |
189 | goto _Exit;\r | |
190 | }\r | |
191 | \r | |
f56b11d2 QL |
192 | BIO_get_mem_ptr (CertBio, &Ptr);\r |
193 | Length = (INT32)(Ptr->length);\r | |
efad60c5 | 194 | if (Length <= 0) {\r |
195 | goto _Exit;\r | |
196 | }\r | |
197 | \r | |
198 | Buffer = malloc (Length);\r | |
199 | if (Buffer == NULL) {\r | |
200 | goto _Exit;\r | |
201 | }\r | |
202 | \r | |
203 | Result = BIO_read (CertBio, Buffer, Length);\r | |
204 | if (Result != Length) {\r | |
205 | goto _Exit;\r | |
206 | }\r | |
207 | \r | |
208 | *Cert = Buffer;\r | |
209 | *CertSize = Length;\r | |
210 | \r | |
211 | Status = TRUE;\r | |
212 | \r | |
213 | _Exit:\r | |
214 | \r | |
215 | BIO_free (CertBio);\r | |
216 | \r | |
217 | if (!Status && (Buffer != NULL)) {\r | |
218 | free (Buffer);\r | |
219 | }\r | |
220 | \r | |
221 | return Status;\r | |
222 | }\r | |
223 | \r | |
532616bb | 224 | /**\r |
225 | Get the signer's certificates from PKCS#7 signed data as described in "PKCS #7:\r | |
226 | Cryptographic Message Syntax Standard". The input signed data could be wrapped\r | |
227 | in a ContentInfo structure.\r | |
228 | \r | |
229 | If P7Data, CertStack, StackLength, TrustedCert or CertLength is NULL, then\r | |
2998af86 | 230 | return FALSE. If P7Length overflow, then return FALSE.\r |
532616bb | 231 | \r |
232 | Caution: This function may receive untrusted input.\r | |
233 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
234 | check for PKCS#7 data structure.\r | |
235 | \r | |
236 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
237 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
238 | @param[out] CertStack Pointer to Signer's certificates retrieved from P7Data.\r | |
6fe575d0 LQ |
239 | It's caller's responsibility to free the buffer with\r |
240 | Pkcs7FreeSigners().\r | |
3702637a | 241 | This data structure is EFI_CERT_STACK type.\r |
532616bb | 242 | @param[out] StackLength Length of signer's certificates in bytes.\r |
243 | @param[out] TrustedCert Pointer to a trusted certificate from Signer's certificates.\r | |
6fe575d0 LQ |
244 | It's caller's responsibility to free the buffer with\r |
245 | Pkcs7FreeSigners().\r | |
532616bb | 246 | @param[out] CertLength Length of the trusted certificate in bytes.\r |
247 | \r | |
248 | @retval TRUE The operation is finished successfully.\r | |
249 | @retval FALSE Error occurs during the operation.\r | |
250 | \r | |
251 | **/\r | |
252 | BOOLEAN\r | |
253 | EFIAPI\r | |
254 | Pkcs7GetSigners (\r | |
255 | IN CONST UINT8 *P7Data,\r | |
256 | IN UINTN P7Length,\r | |
257 | OUT UINT8 **CertStack,\r | |
258 | OUT UINTN *StackLength,\r | |
259 | OUT UINT8 **TrustedCert,\r | |
260 | OUT UINTN *CertLength\r | |
261 | )\r | |
262 | {\r | |
7c342378 MK |
263 | PKCS7 *Pkcs7;\r |
264 | BOOLEAN Status;\r | |
265 | UINT8 *SignedData;\r | |
266 | CONST UINT8 *Temp;\r | |
267 | UINTN SignedDataSize;\r | |
268 | BOOLEAN Wrapped;\r | |
269 | \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 | |
532616bb | 278 | \r |
279 | if ((P7Data == NULL) || (CertStack == NULL) || (StackLength == NULL) ||\r | |
7c342378 MK |
280 | (TrustedCert == NULL) || (CertLength == NULL) || (P7Length > INT_MAX))\r |
281 | {\r | |
532616bb | 282 | return FALSE;\r |
283 | }\r | |
2ac68e8b | 284 | \r |
532616bb | 285 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);\r |
286 | if (!Status) {\r | |
287 | return Status;\r | |
288 | }\r | |
289 | \r | |
290 | Status = FALSE;\r | |
291 | Pkcs7 = NULL;\r | |
292 | Stack = NULL;\r | |
293 | CertBuf = NULL;\r | |
294 | OldBuf = NULL;\r | |
295 | SingleCert = NULL;\r | |
296 | \r | |
297 | //\r | |
298 | // Retrieve PKCS#7 Data (DER encoding)\r | |
299 | //\r | |
300 | if (SignedDataSize > INT_MAX) {\r | |
301 | goto _Exit;\r | |
302 | }\r | |
303 | \r | |
7c342378 MK |
304 | Temp = SignedData;\r |
305 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **)&Temp, (int)SignedDataSize);\r | |
532616bb | 306 | if (Pkcs7 == NULL) {\r |
307 | goto _Exit;\r | |
308 | }\r | |
309 | \r | |
310 | //\r | |
311 | // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)\r | |
312 | //\r | |
313 | if (!PKCS7_type_is_signed (Pkcs7)) {\r | |
314 | goto _Exit;\r | |
315 | }\r | |
316 | \r | |
7c342378 | 317 | Stack = PKCS7_get0_signers (Pkcs7, NULL, PKCS7_BINARY);\r |
532616bb | 318 | if (Stack == NULL) {\r |
319 | goto _Exit;\r | |
320 | }\r | |
321 | \r | |
322 | //\r | |
323 | // Convert CertStack to buffer in following format:\r | |
324 | // UINT8 CertNumber;\r | |
325 | // UINT32 Cert1Length;\r | |
326 | // UINT8 Cert1[];\r | |
327 | // UINT32 Cert2Length;\r | |
328 | // UINT8 Cert2[];\r | |
329 | // ...\r | |
330 | // UINT32 CertnLength;\r | |
331 | // UINT8 Certn[];\r | |
332 | //\r | |
333 | BufferSize = sizeof (UINT8);\r | |
334 | OldSize = BufferSize;\r | |
2ac68e8b | 335 | \r |
532616bb | 336 | for (Index = 0; ; Index++) {\r |
337 | Status = X509PopCertificate (Stack, &SingleCert, &SingleCertSize);\r | |
338 | if (!Status) {\r | |
339 | break;\r | |
340 | }\r | |
341 | \r | |
342 | OldSize = BufferSize;\r | |
343 | OldBuf = CertBuf;\r | |
344 | BufferSize = OldSize + SingleCertSize + sizeof (UINT32);\r | |
345 | CertBuf = malloc (BufferSize);\r | |
346 | \r | |
347 | if (CertBuf == NULL) {\r | |
348 | goto _Exit;\r | |
349 | }\r | |
350 | \r | |
351 | if (OldBuf != NULL) {\r | |
352 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
353 | free (OldBuf);\r | |
354 | OldBuf = NULL;\r | |
355 | }\r | |
356 | \r | |
7c342378 | 357 | WriteUnaligned32 ((UINT32 *)(CertBuf + OldSize), (UINT32)SingleCertSize);\r |
532616bb | 358 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, SingleCertSize);\r |
359 | \r | |
360 | free (SingleCert);\r | |
361 | SingleCert = NULL;\r | |
362 | }\r | |
363 | \r | |
364 | if (CertBuf != NULL) {\r | |
365 | //\r | |
366 | // Update CertNumber.\r | |
367 | //\r | |
368 | CertBuf[0] = Index;\r | |
369 | \r | |
7c342378 | 370 | *CertLength = BufferSize - OldSize - sizeof (UINT32);\r |
532616bb | 371 | *TrustedCert = malloc (*CertLength);\r |
372 | if (*TrustedCert == NULL) {\r | |
373 | goto _Exit;\r | |
374 | }\r | |
375 | \r | |
376 | CopyMem (*TrustedCert, CertBuf + OldSize + sizeof (UINT32), *CertLength);\r | |
377 | *CertStack = CertBuf;\r | |
378 | *StackLength = BufferSize;\r | |
7c342378 | 379 | Status = TRUE;\r |
2ac68e8b | 380 | }\r |
532616bb | 381 | \r |
382 | _Exit:\r | |
383 | //\r | |
384 | // Release Resources\r | |
385 | //\r | |
386 | if (!Wrapped) {\r | |
387 | free (SignedData);\r | |
388 | }\r | |
389 | \r | |
390 | if (Pkcs7 != NULL) {\r | |
391 | PKCS7_free (Pkcs7);\r | |
392 | }\r | |
393 | \r | |
394 | if (Stack != NULL) {\r | |
7c342378 | 395 | sk_X509_pop_free (Stack, X509_free);\r |
532616bb | 396 | }\r |
397 | \r | |
398 | if (SingleCert != NULL) {\r | |
399 | free (SingleCert);\r | |
400 | }\r | |
401 | \r | |
402 | if (!Status && (CertBuf != NULL)) {\r | |
403 | free (CertBuf);\r | |
404 | *CertStack = NULL;\r | |
405 | }\r | |
406 | \r | |
407 | if (OldBuf != NULL) {\r | |
408 | free (OldBuf);\r | |
409 | }\r | |
2ac68e8b | 410 | \r |
532616bb | 411 | return Status;\r |
412 | }\r | |
413 | \r | |
414 | /**\r | |
415 | Wrap function to use free() to free allocated memory for certificates.\r | |
416 | \r | |
417 | @param[in] Certs Pointer to the certificates to be freed.\r | |
418 | \r | |
419 | **/\r | |
420 | VOID\r | |
421 | EFIAPI\r | |
422 | Pkcs7FreeSigners (\r | |
7c342378 | 423 | IN UINT8 *Certs\r |
532616bb | 424 | )\r |
425 | {\r | |
426 | if (Certs == NULL) {\r | |
427 | return;\r | |
428 | }\r | |
429 | \r | |
430 | free (Certs);\r | |
431 | }\r | |
432 | \r | |
45419de6 QL |
433 | /**\r |
434 | Retrieves all embedded certificates from PKCS#7 signed data as described in "PKCS #7:\r | |
435 | Cryptographic Message Syntax Standard", and outputs two certificate lists chained and\r | |
436 | unchained to the signer's certificates.\r | |
437 | The input signed data could be wrapped in a ContentInfo structure.\r | |
438 | \r | |
439 | @param[in] P7Data Pointer to the PKCS#7 message.\r | |
440 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
0f5f6b3d | 441 | @param[out] SignerChainCerts Pointer to the certificates list chained to signer's\r |
6fe575d0 LQ |
442 | certificate. It's caller's responsibility to free the buffer\r |
443 | with Pkcs7FreeSigners().\r | |
3702637a | 444 | This data structure is EFI_CERT_STACK type.\r |
45419de6 QL |
445 | @param[out] ChainLength Length of the chained certificates list buffer in bytes.\r |
446 | @param[out] UnchainCerts Pointer to the unchained certificates lists. It's caller's\r | |
6fe575d0 | 447 | responsibility to free the buffer with Pkcs7FreeSigners().\r |
3702637a | 448 | This data structure is EFI_CERT_STACK type.\r |
45419de6 QL |
449 | @param[out] UnchainLength Length of the unchained certificates list buffer in bytes.\r |
450 | \r | |
451 | @retval TRUE The operation is finished successfully.\r | |
452 | @retval FALSE Error occurs during the operation.\r | |
453 | \r | |
454 | **/\r | |
455 | BOOLEAN\r | |
456 | EFIAPI\r | |
457 | Pkcs7GetCertificatesList (\r | |
458 | IN CONST UINT8 *P7Data,\r | |
459 | IN UINTN P7Length,\r | |
460 | OUT UINT8 **SignerChainCerts,\r | |
461 | OUT UINTN *ChainLength,\r | |
462 | OUT UINT8 **UnchainCerts,\r | |
463 | OUT UINTN *UnchainLength\r | |
464 | )\r | |
465 | {\r | |
7c342378 MK |
466 | BOOLEAN Status;\r |
467 | UINT8 *NewP7Data;\r | |
468 | UINTN NewP7Length;\r | |
469 | BOOLEAN Wrapped;\r | |
470 | UINT8 Index;\r | |
471 | PKCS7 *Pkcs7;\r | |
472 | X509_STORE_CTX *CertCtx;\r | |
473 | \r | |
474 | STACK_OF (X509) *CtxChain;\r | |
475 | STACK_OF (X509) *CtxUntrusted;\r | |
476 | X509 *CtxCert;\r | |
477 | \r | |
478 | STACK_OF (X509) *Signers;\r | |
479 | X509 *Signer;\r | |
480 | X509 *Cert;\r | |
481 | X509 *Issuer;\r | |
482 | X509_NAME *IssuerName;\r | |
483 | UINT8 *CertBuf;\r | |
484 | UINT8 *OldBuf;\r | |
485 | UINTN BufferSize;\r | |
486 | UINTN OldSize;\r | |
487 | UINT8 *SingleCert;\r | |
488 | UINTN CertSize;\r | |
45419de6 QL |
489 | \r |
490 | //\r | |
491 | // Initializations\r | |
492 | //\r | |
7c342378 MK |
493 | Status = FALSE;\r |
494 | NewP7Data = NULL;\r | |
495 | Pkcs7 = NULL;\r | |
496 | CertCtx = NULL;\r | |
497 | CtxChain = NULL;\r | |
498 | CtxCert = NULL;\r | |
499 | CtxUntrusted = NULL;\r | |
500 | Cert = NULL;\r | |
501 | SingleCert = NULL;\r | |
502 | CertBuf = NULL;\r | |
503 | OldBuf = NULL;\r | |
504 | Signers = NULL;\r | |
45419de6 QL |
505 | \r |
506 | //\r | |
507 | // Parameter Checking\r | |
508 | //\r | |
509 | if ((P7Data == NULL) || (SignerChainCerts == NULL) || (ChainLength == NULL) ||\r | |
7c342378 MK |
510 | (UnchainCerts == NULL) || (UnchainLength == NULL) || (P7Length > INT_MAX))\r |
511 | {\r | |
45419de6 QL |
512 | return Status;\r |
513 | }\r | |
514 | \r | |
515 | *SignerChainCerts = NULL;\r | |
516 | *ChainLength = 0;\r | |
517 | *UnchainCerts = NULL;\r | |
518 | *UnchainLength = 0;\r | |
519 | \r | |
520 | //\r | |
521 | // Construct a new PKCS#7 data wrapping with ContentInfo structure if needed.\r | |
522 | //\r | |
523 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &NewP7Data, &NewP7Length);\r | |
524 | if (!Status || (NewP7Length > INT_MAX)) {\r | |
525 | goto _Error;\r | |
526 | }\r | |
527 | \r | |
528 | //\r | |
529 | // Decodes PKCS#7 SignedData\r | |
530 | //\r | |
7c342378 | 531 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **)&NewP7Data, (int)NewP7Length);\r |
45419de6 QL |
532 | if ((Pkcs7 == NULL) || (!PKCS7_type_is_signed (Pkcs7))) {\r |
533 | goto _Error;\r | |
534 | }\r | |
535 | \r | |
536 | //\r | |
537 | // Obtains Signer's Certificate from PKCS#7 data\r | |
538 | // NOTE: Only one signer case will be handled in this function, which means SignerInfos\r | |
0f5f6b3d | 539 | // should include only one signer's certificate.\r |
45419de6 QL |
540 | //\r |
541 | Signers = PKCS7_get0_signers (Pkcs7, NULL, PKCS7_BINARY);\r | |
542 | if ((Signers == NULL) || (sk_X509_num (Signers) != 1)) {\r | |
543 | goto _Error;\r | |
544 | }\r | |
7c342378 | 545 | \r |
45419de6 QL |
546 | Signer = sk_X509_value (Signers, 0);\r |
547 | \r | |
f56b11d2 QL |
548 | CertCtx = X509_STORE_CTX_new ();\r |
549 | if (CertCtx == NULL) {\r | |
550 | goto _Error;\r | |
551 | }\r | |
7c342378 | 552 | \r |
f56b11d2 | 553 | if (!X509_STORE_CTX_init (CertCtx, NULL, Signer, Pkcs7->d.sign->cert)) {\r |
45419de6 QL |
554 | goto _Error;\r |
555 | }\r | |
7c342378 | 556 | \r |
45419de6 QL |
557 | //\r |
558 | // Initialize Chained & Untrusted stack\r | |
559 | //\r | |
f56b11d2 QL |
560 | CtxChain = X509_STORE_CTX_get0_chain (CertCtx);\r |
561 | CtxCert = X509_STORE_CTX_get0_cert (CertCtx);\r | |
562 | if (CtxChain == NULL) {\r | |
563 | if (((CtxChain = sk_X509_new_null ()) == NULL) ||\r | |
7c342378 MK |
564 | (!sk_X509_push (CtxChain, CtxCert)))\r |
565 | {\r | |
45419de6 QL |
566 | goto _Error;\r |
567 | }\r | |
568 | }\r | |
7c342378 | 569 | \r |
f56b11d2 | 570 | CtxUntrusted = X509_STORE_CTX_get0_untrusted (CertCtx);\r |
a9fb7b78 LQ |
571 | if (CtxUntrusted != NULL) {\r |
572 | (VOID)sk_X509_delete_ptr (CtxUntrusted, Signer);\r | |
573 | }\r | |
45419de6 QL |
574 | \r |
575 | //\r | |
576 | // Build certificates stack chained from Signer's certificate.\r | |
577 | //\r | |
578 | Cert = Signer;\r | |
7c342378 | 579 | for ( ; ;) {\r |
45419de6 QL |
580 | //\r |
581 | // Self-Issue checking\r | |
582 | //\r | |
f56b11d2 QL |
583 | Issuer = NULL;\r |
584 | if (X509_STORE_CTX_get1_issuer (&Issuer, CertCtx, Cert) == 1) {\r | |
585 | if (X509_cmp (Issuer, Cert) == 0) {\r | |
586 | break;\r | |
587 | }\r | |
45419de6 QL |
588 | }\r |
589 | \r | |
590 | //\r | |
591 | // Found the issuer of the current certificate\r | |
592 | //\r | |
f56b11d2 | 593 | if (CtxUntrusted != NULL) {\r |
7c342378 | 594 | Issuer = NULL;\r |
f56b11d2 QL |
595 | IssuerName = X509_get_issuer_name (Cert);\r |
596 | Issuer = X509_find_by_subject (CtxUntrusted, IssuerName);\r | |
45419de6 | 597 | if (Issuer != NULL) {\r |
f56b11d2 | 598 | if (!sk_X509_push (CtxChain, Issuer)) {\r |
45419de6 QL |
599 | goto _Error;\r |
600 | }\r | |
7c342378 | 601 | \r |
f56b11d2 | 602 | (VOID)sk_X509_delete_ptr (CtxUntrusted, Issuer);\r |
45419de6 QL |
603 | \r |
604 | Cert = Issuer;\r | |
605 | continue;\r | |
606 | }\r | |
607 | }\r | |
608 | \r | |
609 | break;\r | |
610 | }\r | |
611 | \r | |
612 | //\r | |
613 | // Converts Chained and Untrusted Certificate to Certificate Buffer in following format:\r | |
614 | // UINT8 CertNumber;\r | |
615 | // UINT32 Cert1Length;\r | |
616 | // UINT8 Cert1[];\r | |
617 | // UINT32 Cert2Length;\r | |
618 | // UINT8 Cert2[];\r | |
619 | // ...\r | |
620 | // UINT32 CertnLength;\r | |
621 | // UINT8 Certn[];\r | |
622 | //\r | |
623 | \r | |
f56b11d2 | 624 | if (CtxChain != NULL) {\r |
45419de6 | 625 | BufferSize = sizeof (UINT8);\r |
45419de6 QL |
626 | CertBuf = NULL;\r |
627 | \r | |
628 | for (Index = 0; ; Index++) {\r | |
f56b11d2 | 629 | Status = X509PopCertificate (CtxChain, &SingleCert, &CertSize);\r |
45419de6 QL |
630 | if (!Status) {\r |
631 | break;\r | |
632 | }\r | |
633 | \r | |
634 | OldSize = BufferSize;\r | |
635 | OldBuf = CertBuf;\r | |
636 | BufferSize = OldSize + CertSize + sizeof (UINT32);\r | |
637 | CertBuf = malloc (BufferSize);\r | |
638 | \r | |
639 | if (CertBuf == NULL) {\r | |
640 | Status = FALSE;\r | |
641 | goto _Error;\r | |
642 | }\r | |
7c342378 | 643 | \r |
45419de6 QL |
644 | if (OldBuf != NULL) {\r |
645 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
646 | free (OldBuf);\r | |
647 | OldBuf = NULL;\r | |
648 | }\r | |
649 | \r | |
7c342378 | 650 | WriteUnaligned32 ((UINT32 *)(CertBuf + OldSize), (UINT32)CertSize);\r |
45419de6 QL |
651 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, CertSize);\r |
652 | \r | |
653 | free (SingleCert);\r | |
654 | SingleCert = NULL;\r | |
655 | }\r | |
656 | \r | |
657 | if (CertBuf != NULL) {\r | |
658 | //\r | |
659 | // Update CertNumber.\r | |
660 | //\r | |
661 | CertBuf[0] = Index;\r | |
662 | \r | |
663 | *SignerChainCerts = CertBuf;\r | |
664 | *ChainLength = BufferSize;\r | |
665 | }\r | |
666 | }\r | |
667 | \r | |
f56b11d2 | 668 | if (CtxUntrusted != NULL) {\r |
45419de6 | 669 | BufferSize = sizeof (UINT8);\r |
45419de6 QL |
670 | CertBuf = NULL;\r |
671 | \r | |
672 | for (Index = 0; ; Index++) {\r | |
f56b11d2 | 673 | Status = X509PopCertificate (CtxUntrusted, &SingleCert, &CertSize);\r |
45419de6 QL |
674 | if (!Status) {\r |
675 | break;\r | |
676 | }\r | |
677 | \r | |
678 | OldSize = BufferSize;\r | |
679 | OldBuf = CertBuf;\r | |
680 | BufferSize = OldSize + CertSize + sizeof (UINT32);\r | |
681 | CertBuf = malloc (BufferSize);\r | |
682 | \r | |
683 | if (CertBuf == NULL) {\r | |
684 | Status = FALSE;\r | |
685 | goto _Error;\r | |
686 | }\r | |
7c342378 | 687 | \r |
45419de6 QL |
688 | if (OldBuf != NULL) {\r |
689 | CopyMem (CertBuf, OldBuf, OldSize);\r | |
690 | free (OldBuf);\r | |
691 | OldBuf = NULL;\r | |
692 | }\r | |
693 | \r | |
7c342378 | 694 | WriteUnaligned32 ((UINT32 *)(CertBuf + OldSize), (UINT32)CertSize);\r |
45419de6 QL |
695 | CopyMem (CertBuf + OldSize + sizeof (UINT32), SingleCert, CertSize);\r |
696 | \r | |
697 | free (SingleCert);\r | |
698 | SingleCert = NULL;\r | |
699 | }\r | |
700 | \r | |
701 | if (CertBuf != NULL) {\r | |
702 | //\r | |
703 | // Update CertNumber.\r | |
704 | //\r | |
705 | CertBuf[0] = Index;\r | |
706 | \r | |
707 | *UnchainCerts = CertBuf;\r | |
708 | *UnchainLength = BufferSize;\r | |
709 | }\r | |
710 | }\r | |
711 | \r | |
712 | Status = TRUE;\r | |
713 | \r | |
714 | _Error:\r | |
715 | //\r | |
716 | // Release Resources.\r | |
717 | //\r | |
718 | if (!Wrapped && (NewP7Data != NULL)) {\r | |
719 | free (NewP7Data);\r | |
720 | }\r | |
721 | \r | |
722 | if (Pkcs7 != NULL) {\r | |
723 | PKCS7_free (Pkcs7);\r | |
724 | }\r | |
7c342378 | 725 | \r |
45419de6 QL |
726 | sk_X509_free (Signers);\r |
727 | \r | |
a9fb7b78 LQ |
728 | if (CertCtx != NULL) {\r |
729 | X509_STORE_CTX_cleanup (CertCtx);\r | |
730 | X509_STORE_CTX_free (CertCtx);\r | |
731 | }\r | |
45419de6 QL |
732 | \r |
733 | if (SingleCert != NULL) {\r | |
734 | free (SingleCert);\r | |
735 | }\r | |
736 | \r | |
737 | if (OldBuf != NULL) {\r | |
738 | free (OldBuf);\r | |
739 | }\r | |
740 | \r | |
741 | if (!Status && (CertBuf != NULL)) {\r | |
742 | free (CertBuf);\r | |
743 | *SignerChainCerts = NULL;\r | |
744 | *UnchainCerts = NULL;\r | |
745 | }\r | |
746 | \r | |
747 | return Status;\r | |
748 | }\r | |
749 | \r | |
532616bb | 750 | /**\r |
2998af86 | 751 | Verifies the validity of a PKCS#7 signed data as described in "PKCS #7:\r |
532616bb | 752 | Cryptographic Message Syntax Standard". The input signed data could be wrapped\r |
753 | in a ContentInfo structure.\r | |
754 | \r | |
755 | If P7Data, TrustedCert or InData is NULL, then return FALSE.\r | |
2998af86 | 756 | If P7Length, CertLength or DataLength overflow, then return FALSE.\r |
532616bb | 757 | \r |
758 | Caution: This function may receive untrusted input.\r | |
759 | UEFI Authenticated Variable is external input, so this function will do basic\r | |
760 | check for PKCS#7 data structure.\r | |
761 | \r | |
762 | @param[in] P7Data Pointer to the PKCS#7 message to verify.\r | |
763 | @param[in] P7Length Length of the PKCS#7 message in bytes.\r | |
764 | @param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which\r | |
765 | is used for certificate chain verification.\r | |
766 | @param[in] CertLength Length of the trusted certificate in bytes.\r | |
767 | @param[in] InData Pointer to the content to be verified.\r | |
768 | @param[in] DataLength Length of InData in bytes.\r | |
769 | \r | |
770 | @retval TRUE The specified PKCS#7 signed data is valid.\r | |
771 | @retval FALSE Invalid PKCS#7 signed data.\r | |
772 | \r | |
773 | **/\r | |
774 | BOOLEAN\r | |
775 | EFIAPI\r | |
776 | Pkcs7Verify (\r | |
777 | IN CONST UINT8 *P7Data,\r | |
778 | IN UINTN P7Length,\r | |
779 | IN CONST UINT8 *TrustedCert,\r | |
780 | IN UINTN CertLength,\r | |
781 | IN CONST UINT8 *InData,\r | |
782 | IN UINTN DataLength\r | |
783 | )\r | |
784 | {\r | |
7c342378 MK |
785 | PKCS7 *Pkcs7;\r |
786 | BIO *DataBio;\r | |
787 | BOOLEAN Status;\r | |
788 | X509 *Cert;\r | |
789 | X509_STORE *CertStore;\r | |
790 | UINT8 *SignedData;\r | |
791 | CONST UINT8 *Temp;\r | |
792 | UINTN SignedDataSize;\r | |
793 | BOOLEAN Wrapped;\r | |
532616bb | 794 | \r |
795 | //\r | |
796 | // Check input parameters.\r | |
797 | //\r | |
7c342378 MK |
798 | if ((P7Data == NULL) || (TrustedCert == NULL) || (InData == NULL) ||\r |
799 | (P7Length > INT_MAX) || (CertLength > INT_MAX) || (DataLength > INT_MAX))\r | |
800 | {\r | |
532616bb | 801 | return FALSE;\r |
802 | }\r | |
2ac68e8b | 803 | \r |
532616bb | 804 | Pkcs7 = NULL;\r |
532616bb | 805 | DataBio = NULL;\r |
806 | Cert = NULL;\r | |
807 | CertStore = NULL;\r | |
808 | \r | |
809 | //\r | |
810 | // Register & Initialize necessary digest algorithms for PKCS#7 Handling\r | |
811 | //\r | |
dda39f3a | 812 | if (EVP_add_digest (EVP_md5 ()) == 0) {\r |
813 | return FALSE;\r | |
814 | }\r | |
7c342378 | 815 | \r |
dda39f3a | 816 | if (EVP_add_digest (EVP_sha1 ()) == 0) {\r |
817 | return FALSE;\r | |
818 | }\r | |
7c342378 | 819 | \r |
dda39f3a | 820 | if (EVP_add_digest (EVP_sha256 ()) == 0) {\r |
821 | return FALSE;\r | |
822 | }\r | |
7c342378 | 823 | \r |
2ac68e8b QL |
824 | if (EVP_add_digest (EVP_sha384 ()) == 0) {\r |
825 | return FALSE;\r | |
826 | }\r | |
7c342378 | 827 | \r |
2ac68e8b QL |
828 | if (EVP_add_digest (EVP_sha512 ()) == 0) {\r |
829 | return FALSE;\r | |
830 | }\r | |
7c342378 | 831 | \r |
dda39f3a | 832 | if (EVP_add_digest_alias (SN_sha1WithRSAEncryption, SN_sha1WithRSA) == 0) {\r |
833 | return FALSE;\r | |
834 | }\r | |
835 | \r | |
532616bb | 836 | Status = WrapPkcs7Data (P7Data, P7Length, &Wrapped, &SignedData, &SignedDataSize);\r |
837 | if (!Status) {\r | |
838 | return Status;\r | |
839 | }\r | |
840 | \r | |
841 | Status = FALSE;\r | |
2ac68e8b | 842 | \r |
532616bb | 843 | //\r |
844 | // Retrieve PKCS#7 Data (DER encoding)\r | |
845 | //\r | |
846 | if (SignedDataSize > INT_MAX) {\r | |
847 | goto _Exit;\r | |
848 | }\r | |
849 | \r | |
7c342378 MK |
850 | Temp = SignedData;\r |
851 | Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **)&Temp, (int)SignedDataSize);\r | |
532616bb | 852 | if (Pkcs7 == NULL) {\r |
853 | goto _Exit;\r | |
854 | }\r | |
855 | \r | |
856 | //\r | |
857 | // Check if it's PKCS#7 Signed Data (for Authenticode Scenario)\r | |
858 | //\r | |
859 | if (!PKCS7_type_is_signed (Pkcs7)) {\r | |
860 | goto _Exit;\r | |
861 | }\r | |
862 | \r | |
863 | //\r | |
864 | // Read DER-encoded root certificate and Construct X509 Certificate\r | |
865 | //\r | |
1463ce18 | 866 | Temp = TrustedCert;\r |
7c342378 | 867 | Cert = d2i_X509 (NULL, &Temp, (long)CertLength);\r |
532616bb | 868 | if (Cert == NULL) {\r |
869 | goto _Exit;\r | |
870 | }\r | |
871 | \r | |
872 | //\r | |
873 | // Setup X509 Store for trusted certificate\r | |
874 | //\r | |
875 | CertStore = X509_STORE_new ();\r | |
876 | if (CertStore == NULL) {\r | |
877 | goto _Exit;\r | |
878 | }\r | |
7c342378 | 879 | \r |
532616bb | 880 | if (!(X509_STORE_add_cert (CertStore, Cert))) {\r |
881 | goto _Exit;\r | |
882 | }\r | |
883 | \r | |
532616bb | 884 | //\r |
885 | // For generic PKCS#7 handling, InData may be NULL if the content is present\r | |
886 | // in PKCS#7 structure. So ignore NULL checking here.\r | |
887 | //\r | |
7c342378 | 888 | DataBio = BIO_new_mem_buf (InData, (int)DataLength);\r |
5b2956ea YT |
889 | if (DataBio == NULL) {\r |
890 | goto _Exit;\r | |
891 | }\r | |
892 | \r | |
68547181 DW |
893 | //\r |
894 | // Allow partial certificate chains, terminated by a non-self-signed but\r | |
de0408be | 895 | // still trusted intermediate certificate. Also disable time checks.\r |
68547181 | 896 | //\r |
7c342378 MK |
897 | X509_STORE_set_flags (\r |
898 | CertStore,\r | |
899 | X509_V_FLAG_PARTIAL_CHAIN | X509_V_FLAG_NO_CHECK_TIME\r | |
900 | );\r | |
68547181 | 901 | \r |
02ee8d3b | 902 | //\r |
903 | // OpenSSL PKCS7 Verification by default checks for SMIME (email signing) and\r | |
904 | // doesn't support the extended key usage for Authenticode Code Signing.\r | |
905 | // Bypass the certificate purpose checking by enabling any purposes setting.\r | |
906 | //\r | |
907 | X509_STORE_set_purpose (CertStore, X509_PURPOSE_ANY);\r | |
908 | \r | |
532616bb | 909 | //\r |
910 | // Verifies the PKCS#7 signedData structure\r | |
911 | //\r | |
7c342378 | 912 | Status = (BOOLEAN)PKCS7_verify (Pkcs7, NULL, CertStore, DataBio, NULL, PKCS7_BINARY);\r |
532616bb | 913 | \r |
914 | _Exit:\r | |
915 | //\r | |
916 | // Release Resources\r | |
917 | //\r | |
918 | BIO_free (DataBio);\r | |
532616bb | 919 | X509_free (Cert);\r |
920 | X509_STORE_free (CertStore);\r | |
921 | PKCS7_free (Pkcs7);\r | |
922 | \r | |
923 | if (!Wrapped) {\r | |
924 | OPENSSL_free (SignedData);\r | |
925 | }\r | |
926 | \r | |
927 | return Status;\r | |
afeb55e4 | 928 | }\r |