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Commit | Line | Data |
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031e5cce SM |
1 | // SPDX-License-Identifier: BSD-2-Clause-Patent |
2 | ||
f898777d MG |
3 | /* |
4 | * shim - trivial UEFI first-stage bootloader | |
5 | * | |
031e5cce SM |
6 | * Copyright Red Hat, Inc |
7 | * Author: Matthew Garrett | |
f898777d MG |
8 | * |
9 | * Significant portions of this code are derived from Tianocore | |
10 | * (http://tianocore.sf.net) and are Copyright 2009-2012 Intel | |
11 | * Corporation. | |
12 | */ | |
13 | ||
f4b24734 | 14 | #include "shim.h" |
031e5cce SM |
15 | #if defined(ENABLE_SHIM_CERT) |
16 | #include "shim_cert.h" | |
17 | #endif /* defined(ENABLE_SHIM_CERT) */ | |
7bf7a6d0 | 18 | |
b6f94dbe MTL |
19 | #include <openssl/err.h> |
20 | #include <openssl/bn.h> | |
21 | #include <openssl/dh.h> | |
22 | #include <openssl/ocsp.h> | |
23 | #include <openssl/pkcs12.h> | |
24 | #include <openssl/rand.h> | |
25 | #include <openssl/crypto.h> | |
26 | #include <openssl/ssl.h> | |
62f0afa2 MTL |
27 | #include <openssl/x509.h> |
28 | #include <openssl/x509v3.h> | |
b6f94dbe | 29 | #include <openssl/rsa.h> |
031e5cce | 30 | #include <openssl/dso.h> |
b6f94dbe MTL |
31 | |
32 | #include <Library/BaseCryptLib.h> | |
62f0afa2 | 33 | |
f892ac66 | 34 | #include <stdint.h> |
62f0afa2 MTL |
35 | |
36 | #define OID_EKU_MODSIGN "1.3.6.1.4.1.2312.16.1.2" | |
f898777d | 37 | |
7f055335 | 38 | static EFI_SYSTEM_TABLE *systab; |
f4173af1 | 39 | static EFI_HANDLE global_image_handle; |
031e5cce SM |
40 | static EFI_LOADED_IMAGE *shim_li; |
41 | static EFI_LOADED_IMAGE shim_li_bak; | |
7f055335 | 42 | |
031e5cce | 43 | list_t sbat_var; |
cb59de38 | 44 | |
f898777d MG |
45 | /* |
46 | * The vendor certificate used for validating the second stage loader | |
47 | */ | |
a1f28635 | 48 | extern struct { |
031e5cce SM |
49 | UINT32 vendor_authorized_size; |
50 | UINT32 vendor_deauthorized_size; | |
51 | UINT32 vendor_authorized_offset; | |
52 | UINT32 vendor_deauthorized_offset; | |
a1f28635 PJ |
53 | } cert_table; |
54 | ||
c13fc2f7 MG |
55 | #define EFI_IMAGE_SECURITY_DATABASE_GUID { 0xd719b2cb, 0x3d3a, 0x4596, { 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f }} |
56 | ||
c16548d0 MG |
57 | typedef enum { |
58 | DATA_FOUND, | |
59 | DATA_NOT_FOUND, | |
60 | VAR_NOT_FOUND | |
61 | } CHECK_STATUS; | |
62 | ||
13422973 GCPL |
63 | typedef struct { |
64 | UINT32 MokSize; | |
65 | UINT8 *Mok; | |
66 | } MokListNode; | |
67 | ||
b6f94dbe MTL |
68 | static void |
69 | drain_openssl_errors(void) | |
70 | { | |
71 | unsigned long err = -1; | |
72 | while (err != 0) | |
73 | err = ERR_get_error(); | |
74 | } | |
75 | ||
b8070380 GCPL |
76 | static BOOLEAN verify_x509(UINT8 *Cert, UINTN CertSize) |
77 | { | |
78 | UINTN length; | |
79 | ||
80 | if (!Cert || CertSize < 4) | |
81 | return FALSE; | |
82 | ||
83 | /* | |
84 | * A DER encoding x509 certificate starts with SEQUENCE(0x30), | |
85 | * the number of length bytes, and the number of value bytes. | |
86 | * The size of a x509 certificate is usually between 127 bytes | |
87 | * and 64KB. For convenience, assume the number of value bytes | |
88 | * is 2, i.e. the second byte is 0x82. | |
89 | */ | |
031e5cce SM |
90 | if (Cert[0] != 0x30 || Cert[1] != 0x82) { |
91 | dprint(L"cert[0:1] is [%02x%02x], should be [%02x%02x]\n", | |
92 | Cert[0], Cert[1], 0x30, 0x82); | |
b8070380 | 93 | return FALSE; |
031e5cce | 94 | } |
b8070380 GCPL |
95 | |
96 | length = Cert[2]<<8 | Cert[3]; | |
031e5cce SM |
97 | if (length != (CertSize - 4)) { |
98 | dprint(L"Cert length is %ld, expecting %ld\n", | |
99 | length, CertSize); | |
b8070380 | 100 | return FALSE; |
031e5cce | 101 | } |
b8070380 GCPL |
102 | |
103 | return TRUE; | |
104 | } | |
105 | ||
62f0afa2 MTL |
106 | static BOOLEAN verify_eku(UINT8 *Cert, UINTN CertSize) |
107 | { | |
108 | X509 *x509; | |
109 | CONST UINT8 *Temp = Cert; | |
110 | EXTENDED_KEY_USAGE *eku; | |
111 | ASN1_OBJECT *module_signing; | |
112 | ||
031e5cce SM |
113 | module_signing = OBJ_nid2obj(OBJ_create(OID_EKU_MODSIGN, |
114 | "modsign-eku", | |
115 | "modsign-eku")); | |
62f0afa2 MTL |
116 | |
117 | x509 = d2i_X509 (NULL, &Temp, (long) CertSize); | |
118 | if (x509 != NULL) { | |
119 | eku = X509_get_ext_d2i(x509, NID_ext_key_usage, NULL, NULL); | |
120 | ||
121 | if (eku) { | |
122 | int i = 0; | |
123 | for (i = 0; i < sk_ASN1_OBJECT_num(eku); i++) { | |
124 | ASN1_OBJECT *key_usage = sk_ASN1_OBJECT_value(eku, i); | |
125 | ||
126 | if (OBJ_cmp(module_signing, key_usage) == 0) | |
127 | return FALSE; | |
128 | } | |
129 | EXTENDED_KEY_USAGE_free(eku); | |
130 | } | |
131 | ||
132 | X509_free(x509); | |
133 | } | |
134 | ||
031e5cce | 135 | OBJ_cleanup(); |
62f0afa2 | 136 | |
031e5cce | 137 | return TRUE; |
7bf7a6d0 MTL |
138 | } |
139 | ||
5f0a358b PJ |
140 | static CHECK_STATUS check_db_cert_in_ram(EFI_SIGNATURE_LIST *CertList, |
141 | UINTN dbsize, | |
142 | WIN_CERTIFICATE_EFI_PKCS *data, | |
b6f94dbe MTL |
143 | UINT8 *hash, CHAR16 *dbname, |
144 | EFI_GUID guid) | |
3df68c18 | 145 | { |
3df68c18 | 146 | EFI_SIGNATURE_DATA *Cert; |
b8070380 | 147 | UINTN CertSize; |
c13fc2f7 | 148 | BOOLEAN IsFound = FALSE; |
031e5cce | 149 | int i = 0; |
c16548d0 | 150 | |
c16548d0 | 151 | while ((dbsize > 0) && (dbsize >= CertList->SignatureListSize)) { |
f892ac66 | 152 | if (CompareGuid (&CertList->SignatureType, &EFI_CERT_TYPE_X509_GUID) == 0) { |
c16548d0 | 153 | Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) CertList + sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize); |
b8070380 | 154 | CertSize = CertList->SignatureSize - sizeof(EFI_GUID); |
031e5cce | 155 | dprint(L"trying to verify cert %d (%s)\n", i++, dbname); |
b8070380 | 156 | if (verify_x509(Cert->SignatureData, CertSize)) { |
62f0afa2 | 157 | if (verify_eku(Cert->SignatureData, CertSize)) { |
031e5cce | 158 | drain_openssl_errors(); |
62f0afa2 MTL |
159 | IsFound = AuthenticodeVerify (data->CertData, |
160 | data->Hdr.dwLength - sizeof(data->Hdr), | |
161 | Cert->SignatureData, | |
162 | CertSize, | |
163 | hash, SHA256_DIGEST_SIZE); | |
b6f94dbe | 164 | if (IsFound) { |
031e5cce SM |
165 | dprint(L"AuthenticodeVerify() succeeded: %d\n", IsFound); |
166 | tpm_measure_variable(dbname, guid, CertList->SignatureSize, Cert); | |
b6f94dbe | 167 | drain_openssl_errors(); |
f892ac66 | 168 | return DATA_FOUND; |
b6f94dbe MTL |
169 | } else { |
170 | LogError(L"AuthenticodeVerify(): %d\n", IsFound); | |
171 | } | |
62f0afa2 | 172 | } |
b8070380 | 173 | } else if (verbose) { |
031e5cce SM |
174 | console_print(L"Not a DER encoded x.509 Certificate"); |
175 | dprint(L"cert:\n"); | |
176 | dhexdumpat(Cert->SignatureData, CertSize, 0); | |
c16548d0 | 177 | } |
c16548d0 MG |
178 | } |
179 | ||
180 | dbsize -= CertList->SignatureListSize; | |
181 | CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList + CertList->SignatureListSize); | |
182 | } | |
183 | ||
c16548d0 MG |
184 | return DATA_NOT_FOUND; |
185 | } | |
186 | ||
5f0a358b PJ |
187 | static CHECK_STATUS check_db_cert(CHAR16 *dbname, EFI_GUID guid, |
188 | WIN_CERTIFICATE_EFI_PKCS *data, UINT8 *hash) | |
c16548d0 | 189 | { |
5f0a358b | 190 | CHECK_STATUS rc; |
c16548d0 | 191 | EFI_STATUS efi_status; |
c16548d0 | 192 | EFI_SIGNATURE_LIST *CertList; |
c16548d0 | 193 | UINTN dbsize = 0; |
7f0208a0 | 194 | UINT8 *db; |
3df68c18 | 195 | |
7f0208a0 | 196 | efi_status = get_variable(dbname, &db, &dbsize, guid); |
f892ac66 | 197 | if (EFI_ERROR(efi_status)) |
c16548d0 | 198 | return VAR_NOT_FOUND; |
3df68c18 | 199 | |
7f0208a0 | 200 | CertList = (EFI_SIGNATURE_LIST *)db; |
3df68c18 | 201 | |
b6f94dbe | 202 | rc = check_db_cert_in_ram(CertList, dbsize, data, hash, dbname, guid); |
5f0a358b PJ |
203 | |
204 | FreePool(db); | |
205 | ||
206 | return rc; | |
207 | } | |
208 | ||
20f6cde6 MG |
209 | /* |
210 | * Check a hash against an EFI_SIGNATURE_LIST in a buffer | |
211 | */ | |
5f0a358b PJ |
212 | static CHECK_STATUS check_db_hash_in_ram(EFI_SIGNATURE_LIST *CertList, |
213 | UINTN dbsize, UINT8 *data, | |
b6f94dbe MTL |
214 | int SignatureSize, EFI_GUID CertType, |
215 | CHAR16 *dbname, EFI_GUID guid) | |
5f0a358b PJ |
216 | { |
217 | EFI_SIGNATURE_DATA *Cert; | |
218 | UINTN CertCount, Index; | |
219 | BOOLEAN IsFound = FALSE; | |
220 | ||
c16548d0 | 221 | while ((dbsize > 0) && (dbsize >= CertList->SignatureListSize)) { |
d71240bf | 222 | CertCount = (CertList->SignatureListSize -sizeof (EFI_SIGNATURE_LIST) - CertList->SignatureHeaderSize) / CertList->SignatureSize; |
3df68c18 | 223 | Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) CertList + sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize); |
c13fc2f7 | 224 | if (CompareGuid(&CertList->SignatureType, &CertType) == 0) { |
3df68c18 | 225 | for (Index = 0; Index < CertCount; Index++) { |
c16548d0 | 226 | if (CompareMem (Cert->SignatureData, data, SignatureSize) == 0) { |
3df68c18 MG |
227 | // |
228 | // Find the signature in database. | |
229 | // | |
230 | IsFound = TRUE; | |
031e5cce | 231 | tpm_measure_variable(dbname, guid, CertList->SignatureSize, Cert); |
3df68c18 MG |
232 | break; |
233 | } | |
234 | ||
235 | Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize); | |
236 | } | |
237 | if (IsFound) { | |
238 | break; | |
239 | } | |
240 | } | |
241 | ||
c16548d0 | 242 | dbsize -= CertList->SignatureListSize; |
3df68c18 MG |
243 | CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList + CertList->SignatureListSize); |
244 | } | |
245 | ||
3df68c18 | 246 | if (IsFound) |
c16548d0 MG |
247 | return DATA_FOUND; |
248 | ||
249 | return DATA_NOT_FOUND; | |
250 | } | |
251 | ||
20f6cde6 MG |
252 | /* |
253 | * Check a hash against an EFI_SIGNATURE_LIST in a UEFI variable | |
254 | */ | |
5f0a358b PJ |
255 | static CHECK_STATUS check_db_hash(CHAR16 *dbname, EFI_GUID guid, UINT8 *data, |
256 | int SignatureSize, EFI_GUID CertType) | |
257 | { | |
258 | EFI_STATUS efi_status; | |
259 | EFI_SIGNATURE_LIST *CertList; | |
5f0a358b | 260 | UINTN dbsize = 0; |
7f0208a0 | 261 | UINT8 *db; |
5f0a358b | 262 | |
7f0208a0 | 263 | efi_status = get_variable(dbname, &db, &dbsize, guid); |
f892ac66 | 264 | if (EFI_ERROR(efi_status)) { |
5f0a358b PJ |
265 | return VAR_NOT_FOUND; |
266 | } | |
267 | ||
7f0208a0 | 268 | CertList = (EFI_SIGNATURE_LIST *)db; |
5f0a358b PJ |
269 | |
270 | CHECK_STATUS rc = check_db_hash_in_ram(CertList, dbsize, data, | |
b6f94dbe MTL |
271 | SignatureSize, CertType, |
272 | dbname, guid); | |
5f0a358b PJ |
273 | FreePool(db); |
274 | return rc; | |
275 | ||
276 | } | |
277 | ||
20f6cde6 MG |
278 | /* |
279 | * Check whether the binary signature or hash are present in dbx or the | |
031e5cce | 280 | * built-in denylist |
20f6cde6 | 281 | */ |
031e5cce SM |
282 | static EFI_STATUS check_denylist (WIN_CERTIFICATE_EFI_PKCS *cert, |
283 | UINT8 *sha256hash, UINT8 *sha1hash) | |
c16548d0 | 284 | { |
031e5cce | 285 | EFI_SIGNATURE_LIST *dbx = (EFI_SIGNATURE_LIST *)vendor_deauthorized; |
0a6565c5 | 286 | |
031e5cce | 287 | if (check_db_hash_in_ram(dbx, vendor_deauthorized_size, sha256hash, |
f892ac66 MTL |
288 | SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID, L"dbx", |
289 | EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) { | |
b6f94dbe | 290 | LogError(L"binary sha256hash found in vendor dbx\n"); |
f4173af1 | 291 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 292 | } |
031e5cce | 293 | if (check_db_hash_in_ram(dbx, vendor_deauthorized_size, sha1hash, |
f892ac66 MTL |
294 | SHA1_DIGEST_SIZE, EFI_CERT_SHA1_GUID, L"dbx", |
295 | EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) { | |
b6f94dbe | 296 | LogError(L"binary sha1hash found in vendor dbx\n"); |
f4173af1 | 297 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 298 | } |
f892ac66 | 299 | if (cert && |
031e5cce | 300 | check_db_cert_in_ram(dbx, vendor_deauthorized_size, cert, sha256hash, L"dbx", |
f892ac66 | 301 | EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) { |
b6f94dbe | 302 | LogError(L"cert sha256hash found in vendor dbx\n"); |
f4173af1 | 303 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 304 | } |
f892ac66 MTL |
305 | if (check_db_hash(L"dbx", EFI_SECURE_BOOT_DB_GUID, sha256hash, |
306 | SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID) == DATA_FOUND) { | |
b6f94dbe | 307 | LogError(L"binary sha256hash found in system dbx\n"); |
f4173af1 | 308 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 309 | } |
f892ac66 MTL |
310 | if (check_db_hash(L"dbx", EFI_SECURE_BOOT_DB_GUID, sha1hash, |
311 | SHA1_DIGEST_SIZE, EFI_CERT_SHA1_GUID) == DATA_FOUND) { | |
b6f94dbe | 312 | LogError(L"binary sha1hash found in system dbx\n"); |
f4173af1 | 313 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 314 | } |
f892ac66 MTL |
315 | if (cert && |
316 | check_db_cert(L"dbx", EFI_SECURE_BOOT_DB_GUID, | |
317 | cert, sha256hash) == DATA_FOUND) { | |
b6f94dbe | 318 | LogError(L"cert sha256hash found in system dbx\n"); |
f4173af1 | 319 | return EFI_SECURITY_VIOLATION; |
b6f94dbe | 320 | } |
f892ac66 MTL |
321 | if (check_db_hash(L"MokListX", SHIM_LOCK_GUID, sha256hash, |
322 | SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID) == DATA_FOUND) { | |
b6f94dbe | 323 | LogError(L"binary sha256hash found in Mok dbx\n"); |
f4173af1 | 324 | return EFI_SECURITY_VIOLATION; |
d3819813 | 325 | } |
f892ac66 MTL |
326 | if (cert && |
327 | check_db_cert(L"MokListX", SHIM_LOCK_GUID, | |
328 | cert, sha256hash) == DATA_FOUND) { | |
b6f94dbe | 329 | LogError(L"cert sha256hash found in Mok dbx\n"); |
f4173af1 | 330 | return EFI_SECURITY_VIOLATION; |
d3819813 | 331 | } |
3df68c18 | 332 | |
b6f94dbe | 333 | drain_openssl_errors(); |
3df68c18 MG |
334 | return EFI_SUCCESS; |
335 | } | |
336 | ||
cbef697a PJ |
337 | static void update_verification_method(verification_method_t method) |
338 | { | |
339 | if (verification_method == VERIFIED_BY_NOTHING) | |
340 | verification_method = method; | |
341 | } | |
342 | ||
20f6cde6 MG |
343 | /* |
344 | * Check whether the binary signature or hash are present in db or MokList | |
345 | */ | |
031e5cce | 346 | static EFI_STATUS check_allowlist (WIN_CERTIFICATE_EFI_PKCS *cert, |
ce6a5748 | 347 | UINT8 *sha256hash, UINT8 *sha1hash) |
b2058cf8 | 348 | { |
47ebeb62 | 349 | if (!ignore_db) { |
f892ac66 | 350 | if (check_db_hash(L"db", EFI_SECURE_BOOT_DB_GUID, sha256hash, SHA256_DIGEST_SIZE, |
47ebeb62 JB |
351 | EFI_CERT_SHA256_GUID) == DATA_FOUND) { |
352 | update_verification_method(VERIFIED_BY_HASH); | |
353 | return EFI_SUCCESS; | |
b6f94dbe MTL |
354 | } else { |
355 | LogError(L"check_db_hash(db, sha256hash) != DATA_FOUND\n"); | |
47ebeb62 | 356 | } |
f892ac66 | 357 | if (check_db_hash(L"db", EFI_SECURE_BOOT_DB_GUID, sha1hash, SHA1_DIGEST_SIZE, |
47ebeb62 JB |
358 | EFI_CERT_SHA1_GUID) == DATA_FOUND) { |
359 | verification_method = VERIFIED_BY_HASH; | |
360 | update_verification_method(VERIFIED_BY_HASH); | |
361 | return EFI_SUCCESS; | |
b6f94dbe MTL |
362 | } else { |
363 | LogError(L"check_db_hash(db, sha1hash) != DATA_FOUND\n"); | |
47ebeb62 | 364 | } |
f892ac66 | 365 | if (cert && check_db_cert(L"db", EFI_SECURE_BOOT_DB_GUID, cert, sha256hash) |
8044a321 | 366 | == DATA_FOUND) { |
47ebeb62 JB |
367 | verification_method = VERIFIED_BY_CERT; |
368 | update_verification_method(VERIFIED_BY_CERT); | |
369 | return EFI_SUCCESS; | |
031e5cce | 370 | } else if (cert) { |
b6f94dbe | 371 | LogError(L"check_db_cert(db, sha256hash) != DATA_FOUND\n"); |
47ebeb62 | 372 | } |
cbef697a | 373 | } |
47ebeb62 | 374 | |
031e5cce SM |
375 | #if defined(VENDOR_DB_FILE) |
376 | EFI_SIGNATURE_LIST *db = (EFI_SIGNATURE_LIST *)vendor_db; | |
377 | ||
378 | if (check_db_hash_in_ram(db, vendor_db_size, | |
379 | sha256hash, SHA256_DIGEST_SIZE, | |
380 | EFI_CERT_SHA256_GUID, L"vendor_db", | |
381 | EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) { | |
382 | verification_method = VERIFIED_BY_HASH; | |
383 | update_verification_method(VERIFIED_BY_HASH); | |
384 | return EFI_SUCCESS; | |
385 | } else { | |
386 | LogError(L"check_db_hash(vendor_db, sha256hash) != DATA_FOUND\n"); | |
387 | } | |
388 | if (cert && | |
389 | check_db_cert_in_ram(db, vendor_db_size, | |
390 | cert, sha256hash, L"vendor_db", | |
391 | EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) { | |
392 | verification_method = VERIFIED_BY_CERT; | |
393 | update_verification_method(VERIFIED_BY_CERT); | |
394 | return EFI_SUCCESS; | |
395 | } else if (cert) { | |
396 | LogError(L"check_db_cert(vendor_db, sha256hash) != DATA_FOUND\n"); | |
397 | } | |
398 | #endif | |
399 | ||
2dd2f760 | 400 | if (check_db_hash(L"MokListRT", SHIM_LOCK_GUID, sha256hash, |
f892ac66 MTL |
401 | SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID) |
402 | == DATA_FOUND) { | |
cbef697a PJ |
403 | verification_method = VERIFIED_BY_HASH; |
404 | update_verification_method(VERIFIED_BY_HASH); | |
0a6565c5 | 405 | return EFI_SUCCESS; |
b6f94dbe | 406 | } else { |
2dd2f760 | 407 | LogError(L"check_db_hash(MokListRT, sha256hash) != DATA_FOUND\n"); |
cbef697a | 408 | } |
2dd2f760 | 409 | if (cert && check_db_cert(L"MokListRT", SHIM_LOCK_GUID, cert, sha256hash) |
f892ac66 | 410 | == DATA_FOUND) { |
cbef697a PJ |
411 | verification_method = VERIFIED_BY_CERT; |
412 | update_verification_method(VERIFIED_BY_CERT); | |
b2058cf8 | 413 | return EFI_SUCCESS; |
031e5cce | 414 | } else if (cert) { |
2dd2f760 | 415 | LogError(L"check_db_cert(MokListRT, sha256hash) != DATA_FOUND\n"); |
cbef697a | 416 | } |
b2058cf8 | 417 | |
cbef697a | 418 | update_verification_method(VERIFIED_BY_NOTHING); |
031e5cce | 419 | return EFI_NOT_FOUND; |
b2058cf8 MG |
420 | } |
421 | ||
6279b58e MG |
422 | /* |
423 | * Check whether we're in Secure Boot and user mode | |
424 | */ | |
031e5cce | 425 | BOOLEAN secure_mode (void) |
6279b58e | 426 | { |
d3819813 | 427 | static int first = 1; |
e60f1181 | 428 | if (user_insecure_mode) |
9eaadb0d MG |
429 | return FALSE; |
430 | ||
7a72592b | 431 | if (variable_is_secureboot() != 1) { |
8529e0f7 SM |
432 | if (verbose && !in_protocol && first) { |
433 | CHAR16 *title = L"Secure boot not enabled"; | |
434 | CHAR16 *message = L"Press any key to continue"; | |
435 | console_countdown(title, message, 5); | |
436 | } | |
d3819813 | 437 | first = 0; |
6b1f8796 PJ |
438 | return FALSE; |
439 | } | |
6279b58e | 440 | |
9ea3d9b4 PJ |
441 | /* If we /do/ have "SecureBoot", but /don't/ have "SetupMode", |
442 | * then the implementation is bad, but we assume that secure boot is | |
443 | * enabled according to the status of "SecureBoot". If we have both | |
444 | * of them, then "SetupMode" may tell us additional data, and we need | |
445 | * to consider it. | |
446 | */ | |
447 | if (variable_is_setupmode(0) == 1) { | |
8529e0f7 SM |
448 | if (verbose && !in_protocol && first) { |
449 | CHAR16 *title = L"Platform is in setup mode"; | |
450 | CHAR16 *message = L"Press any key to continue"; | |
451 | console_countdown(title, message, 5); | |
452 | } | |
031e5cce SM |
453 | first = 0; |
454 | return FALSE; | |
cbe21407 MG |
455 | } |
456 | ||
031e5cce SM |
457 | first = 0; |
458 | return TRUE; | |
b2fe1780 MG |
459 | } |
460 | ||
031e5cce SM |
461 | static EFI_STATUS |
462 | verify_one_signature(WIN_CERTIFICATE_EFI_PKCS *sig, | |
463 | UINT8 *sha256hash, UINT8 *sha1hash) | |
b2fe1780 MG |
464 | { |
465 | EFI_STATUS efi_status; | |
7f055335 | 466 | |
20f6cde6 | 467 | /* |
031e5cce | 468 | * Ensure that the binary isn't forbidden |
20f6cde6 | 469 | */ |
031e5cce SM |
470 | drain_openssl_errors(); |
471 | efi_status = check_denylist(sig, sha256hash, sha1hash); | |
f892ac66 | 472 | if (EFI_ERROR(efi_status)) { |
031e5cce SM |
473 | perror(L"Binary is forbidden: %r\n", efi_status); |
474 | PrintErrors(); | |
475 | ClearErrors(); | |
476 | crypterr(efi_status); | |
b2fe1780 MG |
477 | return efi_status; |
478 | } | |
479 | ||
20f6cde6 | 480 | /* |
031e5cce SM |
481 | * Check whether the binary is authorized in any of the firmware |
482 | * databases | |
20f6cde6 | 483 | */ |
031e5cce SM |
484 | drain_openssl_errors(); |
485 | efi_status = check_allowlist(sig, sha256hash, sha1hash); | |
486 | if (EFI_ERROR(efi_status)) { | |
487 | if (efi_status != EFI_NOT_FOUND) { | |
488 | dprint(L"check_allowlist(): %r\n", efi_status); | |
489 | PrintErrors(); | |
490 | ClearErrors(); | |
491 | crypterr(efi_status); | |
492 | } | |
493 | } else { | |
494 | drain_openssl_errors(); | |
f892ac66 MTL |
495 | return efi_status; |
496 | } | |
7f055335 | 497 | |
031e5cce SM |
498 | efi_status = EFI_NOT_FOUND; |
499 | #if defined(ENABLE_SHIM_CERT) | |
500 | /* | |
501 | * Check against the shim build key | |
502 | */ | |
503 | drain_openssl_errors(); | |
504 | if (build_cert && build_cert_size) { | |
505 | dprint("verifying against shim cert\n"); | |
506 | } | |
507 | if (build_cert && build_cert_size && | |
508 | AuthenticodeVerify(sig->CertData, | |
509 | sig->Hdr.dwLength - sizeof(sig->Hdr), | |
510 | build_cert, build_cert_size, sha256hash, | |
511 | SHA256_DIGEST_SIZE)) { | |
512 | dprint(L"AuthenticodeVerify(shim_cert) succeeded\n"); | |
513 | update_verification_method(VERIFIED_BY_CERT); | |
514 | tpm_measure_variable(L"Shim", SHIM_LOCK_GUID, | |
515 | build_cert_size, build_cert); | |
516 | efi_status = EFI_SUCCESS; | |
517 | drain_openssl_errors(); | |
518 | return efi_status; | |
519 | } else { | |
520 | dprint(L"AuthenticodeVerify(shim_cert) failed\n"); | |
521 | PrintErrors(); | |
522 | ClearErrors(); | |
523 | crypterr(EFI_NOT_FOUND); | |
7f055335 | 524 | } |
031e5cce | 525 | #endif /* defined(ENABLE_SHIM_CERT) */ |
7f055335 | 526 | |
031e5cce SM |
527 | #if defined(VENDOR_CERT_FILE) |
528 | /* | |
529 | * And finally, check against shim's built-in key | |
d3819813 | 530 | */ |
031e5cce SM |
531 | drain_openssl_errors(); |
532 | if (vendor_cert_size) { | |
533 | dprint("verifying against vendor_cert\n"); | |
534 | } | |
535 | if (vendor_cert_size && | |
536 | AuthenticodeVerify(sig->CertData, | |
537 | sig->Hdr.dwLength - sizeof(sig->Hdr), | |
538 | vendor_cert, vendor_cert_size, | |
539 | sha256hash, SHA256_DIGEST_SIZE)) { | |
540 | dprint(L"AuthenticodeVerify(vendor_cert) succeeded\n"); | |
541 | update_verification_method(VERIFIED_BY_CERT); | |
542 | tpm_measure_variable(L"Shim", SHIM_LOCK_GUID, | |
543 | vendor_cert_size, vendor_cert); | |
544 | efi_status = EFI_SUCCESS; | |
545 | drain_openssl_errors(); | |
546 | return efi_status; | |
547 | } else { | |
548 | dprint(L"AuthenticodeVerify(vendor_cert) failed\n"); | |
549 | PrintErrors(); | |
550 | ClearErrors(); | |
551 | crypterr(EFI_NOT_FOUND); | |
0e6b0195 | 552 | } |
031e5cce | 553 | #endif /* defined(VENDOR_CERT_FILE) */ |
0e6b0195 | 554 | |
031e5cce SM |
555 | return efi_status; |
556 | } | |
b2fe1780 | 557 | |
031e5cce SM |
558 | /* |
559 | * Check that the signature is valid and matches the binary | |
560 | */ | |
561 | EFI_STATUS | |
e6ace38a SM |
562 | verify_buffer_authenticode (char *data, int datasize, |
563 | PE_COFF_LOADER_IMAGE_CONTEXT *context, | |
564 | UINT8 *sha256hash, UINT8 *sha1hash) | |
031e5cce SM |
565 | { |
566 | EFI_STATUS ret_efi_status; | |
567 | size_t size = datasize; | |
568 | size_t offset = 0; | |
569 | unsigned int i = 0; | |
d3819813 | 570 | |
031e5cce SM |
571 | if (datasize < 0) |
572 | return EFI_INVALID_PARAMETER; | |
d3819813 | 573 | |
d3819813 | 574 | /* |
031e5cce SM |
575 | * Clear OpenSSL's error log, because we get some DSO unimplemented |
576 | * errors during its intialization, and we don't want those to look | |
577 | * like they're the reason for validation failures. | |
d3819813 | 578 | */ |
031e5cce | 579 | drain_openssl_errors(); |
a16340e3 | 580 | |
031e5cce SM |
581 | ret_efi_status = generate_hash(data, datasize, context, sha256hash, sha1hash); |
582 | if (EFI_ERROR(ret_efi_status)) { | |
583 | dprint(L"generate_hash: %r\n", ret_efi_status); | |
584 | PrintErrors(); | |
585 | ClearErrors(); | |
586 | crypterr(ret_efi_status); | |
587 | return ret_efi_status; | |
588 | } | |
a16340e3 | 589 | |
20f6cde6 | 590 | /* |
031e5cce | 591 | * Ensure that the binary isn't forbidden by hash |
20f6cde6 | 592 | */ |
031e5cce SM |
593 | drain_openssl_errors(); |
594 | ret_efi_status = check_denylist(NULL, sha256hash, sha1hash); | |
595 | if (EFI_ERROR(ret_efi_status)) { | |
596 | // perror(L"Binary is forbidden\n"); | |
597 | // dprint(L"Binary is forbidden: %r\n", ret_efi_status); | |
598 | PrintErrors(); | |
599 | ClearErrors(); | |
600 | crypterr(ret_efi_status); | |
601 | return ret_efi_status; | |
602 | } | |
7de74e67 | 603 | |
031e5cce SM |
604 | /* |
605 | * Check whether the binary is authorized by hash in any of the | |
606 | * firmware databases | |
607 | */ | |
608 | drain_openssl_errors(); | |
609 | ret_efi_status = check_allowlist(NULL, sha256hash, sha1hash); | |
610 | if (EFI_ERROR(ret_efi_status)) { | |
611 | LogError(L"check_allowlist(): %r\n", ret_efi_status); | |
612 | dprint(L"check_allowlist: %r\n", ret_efi_status); | |
613 | if (ret_efi_status != EFI_NOT_FOUND) { | |
614 | dprint(L"check_allowlist(): %r\n", ret_efi_status); | |
615 | PrintErrors(); | |
616 | ClearErrors(); | |
617 | crypterr(ret_efi_status); | |
618 | return ret_efi_status; | |
a16340e3 | 619 | } |
031e5cce SM |
620 | } else { |
621 | drain_openssl_errors(); | |
622 | return ret_efi_status; | |
623 | } | |
a16340e3 | 624 | |
031e5cce SM |
625 | if (context->SecDir->Size == 0) { |
626 | dprint(L"No signatures found\n"); | |
627 | return EFI_SECURITY_VIOLATION; | |
628 | } | |
a16340e3 | 629 | |
fd2d9f03 SM |
630 | if (checked_add(context->SecDir->Size, context->SecDir->VirtualAddress, &offset) || |
631 | offset > size) { | |
031e5cce SM |
632 | perror(L"Certificate Database size is too large\n"); |
633 | return EFI_INVALID_PARAMETER; | |
634 | } | |
d3819813 | 635 | |
fd2d9f03 | 636 | offset = 0; |
031e5cce SM |
637 | ret_efi_status = EFI_NOT_FOUND; |
638 | do { | |
639 | WIN_CERTIFICATE_EFI_PKCS *sig = NULL; | |
640 | size_t sz; | |
d3819813 | 641 | |
031e5cce SM |
642 | sig = ImageAddress(data, size, |
643 | context->SecDir->VirtualAddress + offset); | |
644 | if (!sig) | |
645 | break; | |
62f0afa2 | 646 | |
fd2d9f03 SM |
647 | if ((uint64_t)(uintptr_t)&sig[1] |
648 | > (uint64_t)(uintptr_t)data + datasize) { | |
649 | perror(L"Certificate size is too large for secruity database"); | |
650 | return EFI_INVALID_PARAMETER; | |
651 | } | |
652 | ||
031e5cce SM |
653 | sz = offset + offsetof(WIN_CERTIFICATE_EFI_PKCS, Hdr.dwLength) |
654 | + sizeof(sig->Hdr.dwLength); | |
655 | if (sz > context->SecDir->Size) { | |
656 | perror(L"Certificate size is too large for secruity database"); | |
657 | return EFI_INVALID_PARAMETER; | |
658 | } | |
b2fe1780 | 659 | |
031e5cce SM |
660 | sz = sig->Hdr.dwLength; |
661 | if (sz > context->SecDir->Size - offset) { | |
662 | perror(L"Certificate size is too large for secruity database"); | |
663 | return EFI_INVALID_PARAMETER; | |
62f0afa2 | 664 | } |
b2fe1780 | 665 | |
031e5cce SM |
666 | if (sz < sizeof(sig->Hdr)) { |
667 | perror(L"Certificate size is too small for certificate data"); | |
668 | return EFI_INVALID_PARAMETER; | |
669 | } | |
486bf03e | 670 | |
031e5cce SM |
671 | if (sig->Hdr.wCertificateType == WIN_CERT_TYPE_PKCS_SIGNED_DATA) { |
672 | EFI_STATUS efi_status; | |
486bf03e | 673 | |
031e5cce | 674 | dprint(L"Attempting to verify signature %d:\n", i++); |
b2fe1780 | 675 | |
031e5cce | 676 | efi_status = verify_one_signature(sig, sha256hash, sha1hash); |
5fe882ba | 677 | |
031e5cce SM |
678 | /* |
679 | * If we didn't get EFI_SECURITY_VIOLATION from | |
680 | * checking the hashes above, then any dbx entries are | |
681 | * for a certificate, not this individual binary. | |
682 | * | |
683 | * So don't clobber successes with security violation | |
684 | * here; that just means it isn't a success. | |
685 | */ | |
686 | if (ret_efi_status != EFI_SUCCESS) | |
687 | ret_efi_status = efi_status; | |
688 | } else { | |
689 | perror(L"Unsupported certificate type %x\n", | |
690 | sig->Hdr.wCertificateType); | |
691 | } | |
692 | offset = ALIGN_VALUE(offset + sz, 8); | |
693 | } while (offset < context->SecDir->Size); | |
09e2c939 | 694 | |
031e5cce SM |
695 | if (ret_efi_status != EFI_SUCCESS) { |
696 | dprint(L"Binary is not authorized\n"); | |
697 | PrintErrors(); | |
698 | ClearErrors(); | |
699 | crypterr(EFI_SECURITY_VIOLATION); | |
700 | ret_efi_status = EFI_SECURITY_VIOLATION; | |
0e6b0195 | 701 | } |
031e5cce SM |
702 | drain_openssl_errors(); |
703 | return ret_efi_status; | |
b2fe1780 MG |
704 | } |
705 | ||
e6ace38a SM |
706 | /* |
707 | * Check that the binary is permitted to load by SBAT. | |
708 | */ | |
709 | EFI_STATUS | |
710 | verify_buffer_sbat (char *data, int datasize, | |
711 | PE_COFF_LOADER_IMAGE_CONTEXT *context) | |
712 | { | |
713 | int i; | |
714 | EFI_IMAGE_SECTION_HEADER *Section; | |
715 | char *SBATBase = NULL; | |
716 | size_t SBATSize = 0; | |
717 | ||
718 | Section = context->FirstSection; | |
719 | for (i = 0; i < context->NumberOfSections; i++, Section++) { | |
fd2d9f03 SM |
720 | if ((uint64_t)(uintptr_t)&Section[1] |
721 | > (uintptr_t)(uintptr_t)data + datasize) { | |
722 | perror(L"Section exceeds bounds of image\n"); | |
723 | return EFI_UNSUPPORTED; | |
724 | } | |
725 | ||
e6ace38a SM |
726 | if (CompareMem(Section->Name, ".sbat\0\0\0", 8) != 0) |
727 | continue; | |
728 | ||
729 | if (SBATBase || SBATSize) { | |
730 | perror(L"Image has multiple SBAT sections\n"); | |
731 | return EFI_UNSUPPORTED; | |
732 | } | |
733 | ||
734 | if (Section->NumberOfRelocations != 0 || | |
735 | Section->PointerToRelocations != 0) { | |
736 | perror(L"SBAT section has relocations\n"); | |
737 | return EFI_UNSUPPORTED; | |
738 | } | |
739 | ||
740 | /* The virtual size corresponds to the size of the SBAT | |
741 | * metadata and isn't necessarily a multiple of the file | |
742 | * alignment. The on-disk size is a multiple of the file | |
743 | * alignment and is zero padded. Make sure that the | |
744 | * on-disk size is at least as large as virtual size, | |
745 | * and ignore the section if it isn't. */ | |
746 | if (Section->SizeOfRawData && | |
747 | Section->SizeOfRawData >= Section->Misc.VirtualSize) { | |
fd2d9f03 | 748 | uint64_t boundary; |
e6ace38a SM |
749 | SBATBase = ImageAddress(data, datasize, |
750 | Section->PointerToRawData); | |
751 | SBATSize = Section->SizeOfRawData; | |
752 | dprint(L"sbat section base:0x%lx size:0x%lx\n", | |
753 | SBATBase, SBATSize); | |
fd2d9f03 SM |
754 | if (checked_add((uint64_t)(uintptr_t)SBATBase, SBATSize, &boundary) || |
755 | (boundary > (uint64_t)(uintptr_t)data + datasize)) { | |
756 | perror(L"Section exceeds bounds of image\n"); | |
757 | return EFI_UNSUPPORTED; | |
758 | } | |
e6ace38a SM |
759 | } |
760 | } | |
761 | ||
762 | return verify_sbat_section(SBATBase, SBATSize); | |
763 | } | |
764 | ||
765 | /* | |
766 | * Check that the signature is valid and matches the binary and that | |
767 | * the binary is permitted to load by SBAT. | |
768 | */ | |
769 | EFI_STATUS | |
770 | verify_buffer (char *data, int datasize, | |
771 | PE_COFF_LOADER_IMAGE_CONTEXT *context, | |
772 | UINT8 *sha256hash, UINT8 *sha1hash) | |
773 | { | |
774 | EFI_STATUS efi_status; | |
775 | ||
fd2d9f03 | 776 | efi_status = verify_buffer_authenticode(data, datasize, context, sha256hash, sha1hash); |
e6ace38a SM |
777 | if (EFI_ERROR(efi_status)) |
778 | return efi_status; | |
779 | ||
fd2d9f03 | 780 | return verify_buffer_sbat(data, datasize, context); |
e6ace38a SM |
781 | } |
782 | ||
6d6b0221 | 783 | static int |
8529e0f7 | 784 | is_removable_media_path(EFI_LOADED_IMAGE *li) |
6d6b0221 | 785 | { |
6d6b0221 | 786 | unsigned int pathlen = 0; |
fe8527aa | 787 | CHAR16 *bootpath = NULL; |
fe8527aa | 788 | int ret = 0; |
6d6b0221 | 789 | |
2e7fc28d | 790 | bootpath = DevicePathToStr(li->FilePath); |
6d6b0221 PJ |
791 | |
792 | /* Check the beginning of the string and the end, to avoid | |
793 | * caring about which arch this is. */ | |
794 | /* I really don't know why, but sometimes bootpath gives us | |
795 | * L"\\EFI\\BOOT\\/BOOTX64.EFI". So just handle that here... | |
796 | */ | |
797 | if (StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\BOOT", 14) && | |
d3819813 MTL |
798 | StrnCaseCmp(bootpath, L"\\EFI\\BOOT\\/BOOT", 15) && |
799 | StrnCaseCmp(bootpath, L"EFI\\BOOT\\BOOT", 13) && | |
800 | StrnCaseCmp(bootpath, L"EFI\\BOOT\\/BOOT", 14)) | |
fe8527aa | 801 | goto error; |
2e7fc28d | 802 | |
6d6b0221 PJ |
803 | pathlen = StrLen(bootpath); |
804 | if (pathlen < 5 || StrCaseCmp(bootpath + pathlen - 4, L".EFI")) | |
fe8527aa | 805 | goto error; |
6d6b0221 | 806 | |
8529e0f7 SM |
807 | ret = 1; |
808 | ||
809 | error: | |
810 | if (bootpath) | |
811 | FreePool(bootpath); | |
812 | ||
813 | return ret; | |
814 | } | |
815 | ||
816 | static int | |
817 | should_use_fallback(EFI_HANDLE image_handle) | |
818 | { | |
819 | EFI_LOADED_IMAGE *li; | |
820 | EFI_FILE_IO_INTERFACE *fio = NULL; | |
821 | EFI_FILE *vh = NULL; | |
822 | EFI_FILE *fh = NULL; | |
823 | EFI_STATUS efi_status; | |
824 | int ret = 0; | |
825 | ||
826 | efi_status = BS->HandleProtocol(image_handle, &EFI_LOADED_IMAGE_GUID, | |
827 | (void **)&li); | |
828 | if (EFI_ERROR(efi_status)) { | |
829 | perror(L"Could not get image for boot" EFI_ARCH L".efi: %r\n", | |
830 | efi_status); | |
831 | return 0; | |
832 | } | |
833 | ||
834 | if (!is_removable_media_path(li)) | |
835 | goto error; | |
836 | ||
837 | efi_status = BS->HandleProtocol(li->DeviceHandle, &FileSystemProtocol, | |
838 | (void **) &fio); | |
f892ac66 MTL |
839 | if (EFI_ERROR(efi_status)) { |
840 | perror(L"Could not get fio for li->DeviceHandle: %r\n", | |
841 | efi_status); | |
fe8527aa | 842 | goto error; |
c9d11306 | 843 | } |
e50cfe37 | 844 | |
f892ac66 MTL |
845 | efi_status = fio->OpenVolume(fio, &vh); |
846 | if (EFI_ERROR(efi_status)) { | |
847 | perror(L"Could not open fio volume: %r\n", efi_status); | |
fe8527aa | 848 | goto error; |
c9d11306 | 849 | } |
6d6b0221 | 850 | |
f892ac66 MTL |
851 | efi_status = vh->Open(vh, &fh, L"\\EFI\\BOOT" FALLBACK, |
852 | EFI_FILE_MODE_READ, 0); | |
853 | if (EFI_ERROR(efi_status)) { | |
b32a3ce1 PJ |
854 | /* Do not print the error here - this is an acceptable case |
855 | * for removable media, where we genuinely don't want | |
856 | * fallback.efi to exist. | |
f892ac66 MTL |
857 | * Print(L"Could not open \"\\EFI\\BOOT%s\": %r\n", FALLBACK, |
858 | * efi_status); | |
b32a3ce1 | 859 | */ |
fe8527aa | 860 | goto error; |
6d6b0221 | 861 | } |
6d6b0221 | 862 | |
fe8527aa GCPL |
863 | ret = 1; |
864 | error: | |
d3819813 | 865 | if (fh) |
f892ac66 | 866 | fh->Close(fh); |
d3819813 | 867 | if (vh) |
f892ac66 | 868 | vh->Close(vh); |
fe8527aa GCPL |
869 | |
870 | return ret; | |
6d6b0221 | 871 | } |
db54b0a4 | 872 | /* |
20f6cde6 | 873 | * Open the second stage bootloader and read it into a buffer |
db54b0a4 | 874 | */ |
822d089e GCPL |
875 | static EFI_STATUS load_image (EFI_LOADED_IMAGE *li, void **data, |
876 | int *datasize, CHAR16 *PathName) | |
db54b0a4 | 877 | { |
db54b0a4 MG |
878 | EFI_STATUS efi_status; |
879 | EFI_HANDLE device; | |
880 | EFI_FILE_INFO *fileinfo = NULL; | |
881 | EFI_FILE_IO_INTERFACE *drive; | |
882 | EFI_FILE *root, *grub; | |
6eb1eca4 | 883 | UINTN buffersize = sizeof(EFI_FILE_INFO); |
db54b0a4 MG |
884 | |
885 | device = li->DeviceHandle; | |
f898777d | 886 | |
031e5cce | 887 | dprint(L"attempting to load %s\n", PathName); |
20f6cde6 MG |
888 | /* |
889 | * Open the device | |
890 | */ | |
8529e0f7 SM |
891 | efi_status = BS->HandleProtocol(device, &EFI_SIMPLE_FILE_SYSTEM_GUID, |
892 | (void **) &drive); | |
f892ac66 | 893 | if (EFI_ERROR(efi_status)) { |
e50cfe37 | 894 | perror(L"Failed to find fs: %r\n", efi_status); |
0db1af8a MG |
895 | goto error; |
896 | } | |
f898777d | 897 | |
f892ac66 MTL |
898 | efi_status = drive->OpenVolume(drive, &root); |
899 | if (EFI_ERROR(efi_status)) { | |
e50cfe37 | 900 | perror(L"Failed to open fs: %r\n", efi_status); |
0db1af8a MG |
901 | goto error; |
902 | } | |
f898777d | 903 | |
20f6cde6 MG |
904 | /* |
905 | * And then open the file | |
906 | */ | |
f892ac66 MTL |
907 | efi_status = root->Open(root, &grub, PathName, EFI_FILE_MODE_READ, 0); |
908 | if (EFI_ERROR(efi_status)) { | |
e50cfe37 | 909 | perror(L"Failed to open %s - %r\n", PathName, efi_status); |
0db1af8a MG |
910 | goto error; |
911 | } | |
912 | ||
913 | fileinfo = AllocatePool(buffersize); | |
914 | ||
915 | if (!fileinfo) { | |
e50cfe37 | 916 | perror(L"Unable to allocate file info buffer\n"); |
0db1af8a MG |
917 | efi_status = EFI_OUT_OF_RESOURCES; |
918 | goto error; | |
f898777d MG |
919 | } |
920 | ||
20f6cde6 MG |
921 | /* |
922 | * Find out how big the file is in order to allocate the storage | |
923 | * buffer | |
924 | */ | |
f892ac66 MTL |
925 | efi_status = grub->GetInfo(grub, &EFI_FILE_INFO_GUID, &buffersize, |
926 | fileinfo); | |
f898777d | 927 | if (efi_status == EFI_BUFFER_TOO_SMALL) { |
cbe21407 | 928 | FreePool(fileinfo); |
f898777d MG |
929 | fileinfo = AllocatePool(buffersize); |
930 | if (!fileinfo) { | |
e50cfe37 | 931 | perror(L"Unable to allocate file info buffer\n"); |
0db1af8a MG |
932 | efi_status = EFI_OUT_OF_RESOURCES; |
933 | goto error; | |
f898777d | 934 | } |
f892ac66 MTL |
935 | efi_status = grub->GetInfo(grub, &EFI_FILE_INFO_GUID, |
936 | &buffersize, fileinfo); | |
f898777d MG |
937 | } |
938 | ||
f892ac66 | 939 | if (EFI_ERROR(efi_status)) { |
e50cfe37 | 940 | perror(L"Unable to get file info: %r\n", efi_status); |
0db1af8a | 941 | goto error; |
f898777d MG |
942 | } |
943 | ||
944 | buffersize = fileinfo->FileSize; | |
7db60bd8 | 945 | *data = AllocatePool(buffersize); |
7db60bd8 | 946 | if (!*data) { |
e50cfe37 | 947 | perror(L"Unable to allocate file buffer\n"); |
0db1af8a MG |
948 | efi_status = EFI_OUT_OF_RESOURCES; |
949 | goto error; | |
f898777d | 950 | } |
20f6cde6 MG |
951 | |
952 | /* | |
953 | * Perform the actual read | |
954 | */ | |
f892ac66 | 955 | efi_status = grub->Read(grub, &buffersize, *data); |
0db1af8a MG |
956 | if (efi_status == EFI_BUFFER_TOO_SMALL) { |
957 | FreePool(*data); | |
958 | *data = AllocatePool(buffersize); | |
f892ac66 | 959 | efi_status = grub->Read(grub, &buffersize, *data); |
f898777d | 960 | } |
f892ac66 MTL |
961 | if (EFI_ERROR(efi_status)) { |
962 | perror(L"Unexpected return from initial read: %r, buffersize %x\n", | |
963 | efi_status, buffersize); | |
0db1af8a | 964 | goto error; |
f898777d MG |
965 | } |
966 | ||
7db60bd8 | 967 | *datasize = buffersize; |
f898777d | 968 | |
cbe21407 MG |
969 | FreePool(fileinfo); |
970 | ||
f898777d | 971 | return EFI_SUCCESS; |
0db1af8a MG |
972 | error: |
973 | if (*data) { | |
974 | FreePool(*data); | |
975 | *data = NULL; | |
976 | } | |
6f161626 | 977 | |
0db1af8a MG |
978 | if (fileinfo) |
979 | FreePool(fileinfo); | |
980 | return efi_status; | |
f898777d MG |
981 | } |
982 | ||
20f6cde6 MG |
983 | /* |
984 | * Protocol entry point. If secure boot is enabled, verify that the provided | |
985 | * buffer is signed with a trusted key. | |
986 | */ | |
db54b0a4 | 987 | EFI_STATUS shim_verify (void *buffer, UINT32 size) |
f4b24734 | 988 | { |
f892ac66 | 989 | EFI_STATUS efi_status = EFI_SUCCESS; |
f4b24734 | 990 | PE_COFF_LOADER_IMAGE_CONTEXT context; |
b6f94dbe MTL |
991 | UINT8 sha1hash[SHA1_DIGEST_SIZE]; |
992 | UINT8 sha256hash[SHA256_DIGEST_SIZE]; | |
f4b24734 | 993 | |
f892ac66 MTL |
994 | if ((INT32)size < 0) |
995 | return EFI_INVALID_PARAMETER; | |
996 | ||
cbef697a | 997 | loader_is_participating = 1; |
e50cfe37 | 998 | in_protocol = 1; |
cbef697a | 999 | |
f892ac66 MTL |
1000 | efi_status = read_header(buffer, size, &context); |
1001 | if (EFI_ERROR(efi_status)) | |
d3819813 | 1002 | goto done; |
6279b58e | 1003 | |
f892ac66 MTL |
1004 | efi_status = generate_hash(buffer, size, &context, |
1005 | sha256hash, sha1hash); | |
1006 | if (EFI_ERROR(efi_status)) | |
e50cfe37 | 1007 | goto done; |
f4b24734 | 1008 | |
f892ac66 MTL |
1009 | /* Measure the binary into the TPM */ |
1010 | #ifdef REQUIRE_TPM | |
1011 | efi_status = | |
1012 | #endif | |
031e5cce SM |
1013 | tpm_log_pe((EFI_PHYSICAL_ADDRESS)(UINTN)buffer, size, 0, NULL, |
1014 | sha1hash, 4); | |
f892ac66 MTL |
1015 | #ifdef REQUIRE_TPM |
1016 | if (EFI_ERROR(efi_status)) | |
1017 | goto done; | |
1018 | #endif | |
1019 | ||
1020 | if (!secure_mode()) { | |
1021 | efi_status = EFI_SUCCESS; | |
b6f94dbe | 1022 | goto done; |
f892ac66 | 1023 | } |
b6f94dbe | 1024 | |
031e5cce SM |
1025 | efi_status = verify_buffer(buffer, size, |
1026 | &context, sha256hash, sha1hash); | |
e50cfe37 GCPL |
1027 | done: |
1028 | in_protocol = 0; | |
f892ac66 | 1029 | return efi_status; |
e50cfe37 GCPL |
1030 | } |
1031 | ||
1032 | static EFI_STATUS shim_hash (char *data, int datasize, | |
1033 | PE_COFF_LOADER_IMAGE_CONTEXT *context, | |
1034 | UINT8 *sha256hash, UINT8 *sha1hash) | |
1035 | { | |
f892ac66 MTL |
1036 | EFI_STATUS efi_status; |
1037 | ||
1038 | if (datasize < 0) | |
1039 | return EFI_INVALID_PARAMETER; | |
e50cfe37 GCPL |
1040 | |
1041 | in_protocol = 1; | |
f892ac66 MTL |
1042 | efi_status = generate_hash(data, datasize, context, |
1043 | sha256hash, sha1hash); | |
e50cfe37 GCPL |
1044 | in_protocol = 0; |
1045 | ||
f892ac66 | 1046 | return efi_status; |
e50cfe37 GCPL |
1047 | } |
1048 | ||
1049 | static EFI_STATUS shim_read_header(void *data, unsigned int datasize, | |
1050 | PE_COFF_LOADER_IMAGE_CONTEXT *context) | |
1051 | { | |
f892ac66 | 1052 | EFI_STATUS efi_status; |
e50cfe37 GCPL |
1053 | |
1054 | in_protocol = 1; | |
f892ac66 | 1055 | efi_status = read_header(data, datasize, context); |
e50cfe37 | 1056 | in_protocol = 0; |
f4b24734 | 1057 | |
f892ac66 | 1058 | return efi_status; |
f4b24734 MG |
1059 | } |
1060 | ||
031e5cce SM |
1061 | VOID |
1062 | restore_loaded_image(VOID) | |
1063 | { | |
1064 | if (shim_li->FilePath) | |
1065 | FreePool(shim_li->FilePath); | |
1066 | ||
1067 | /* | |
1068 | * Restore our original loaded image values | |
1069 | */ | |
1070 | CopyMem(shim_li, &shim_li_bak, sizeof(shim_li_bak)); | |
1071 | } | |
1072 | ||
fd2d9f03 SM |
1073 | /* If gets used on static data it probably needs boundary checking */ |
1074 | void | |
1075 | str16_to_str8(CHAR16 *str16, CHAR8 **str8) | |
1076 | { | |
1077 | int i = 0; | |
1078 | ||
1079 | while (str16[i++] != '\0'); | |
1080 | *str8 = (CHAR8 *)AllocatePool((i + 1) * sizeof (CHAR8)); | |
1081 | ||
1082 | i = 0; | |
1083 | while (str16[i] != '\0') { | |
1084 | (*str8)[i] = (CHAR8)str16[i]; | |
1085 | i++; | |
1086 | } | |
1087 | (*str8)[i] = '\0'; | |
1088 | } | |
1089 | ||
20f6cde6 MG |
1090 | /* |
1091 | * Load and run an EFI executable | |
1092 | */ | |
e6ace38a SM |
1093 | EFI_STATUS read_image(EFI_HANDLE image_handle, CHAR16 *ImagePath, |
1094 | CHAR16 **PathName, void **data, int *datasize) | |
822d089e GCPL |
1095 | { |
1096 | EFI_STATUS efi_status; | |
1c595706 | 1097 | void *sourcebuffer = NULL; |
fbc486b5 | 1098 | UINT64 sourcesize = 0; |
fd2d9f03 | 1099 | CHAR8 *netbootname; |
822d089e | 1100 | |
20f6cde6 MG |
1101 | /* |
1102 | * We need to refer to the loaded image protocol on the running | |
1103 | * binary in order to find our path | |
1104 | */ | |
8529e0f7 SM |
1105 | efi_status = BS->HandleProtocol(image_handle, &EFI_LOADED_IMAGE_GUID, |
1106 | (void **)&shim_li); | |
f892ac66 | 1107 | if (EFI_ERROR(efi_status)) { |
e50cfe37 | 1108 | perror(L"Unable to init protocol\n"); |
cec6a0a9 GCPL |
1109 | return efi_status; |
1110 | } | |
1111 | ||
20f6cde6 MG |
1112 | /* |
1113 | * Build a new path from the existing one plus the executable name | |
1114 | */ | |
e6ace38a | 1115 | efi_status = generate_path_from_image_path(shim_li, ImagePath, PathName); |
f892ac66 MTL |
1116 | if (EFI_ERROR(efi_status)) { |
1117 | perror(L"Unable to generate path %s: %r\n", ImagePath, | |
1118 | efi_status); | |
e6ace38a | 1119 | return efi_status; |
cec6a0a9 GCPL |
1120 | } |
1121 | ||
031e5cce | 1122 | if (findNetboot(shim_li->DeviceHandle)) { |
fd2d9f03 SM |
1123 | str16_to_str8(ImagePath, &netbootname); |
1124 | efi_status = parseNetbootinfo(image_handle, netbootname); | |
f892ac66 | 1125 | if (EFI_ERROR(efi_status)) { |
e50cfe37 | 1126 | perror(L"Netboot parsing failed: %r\n", efi_status); |
1c595706 MG |
1127 | return EFI_PROTOCOL_ERROR; |
1128 | } | |
fd2d9f03 | 1129 | FreePool(netbootname); |
1c595706 MG |
1130 | efi_status = FetchNetbootimage(image_handle, &sourcebuffer, |
1131 | &sourcesize); | |
f892ac66 MTL |
1132 | if (EFI_ERROR(efi_status)) { |
1133 | perror(L"Unable to fetch TFTP image: %r\n", | |
1134 | efi_status); | |
1c595706 MG |
1135 | return efi_status; |
1136 | } | |
e6ace38a SM |
1137 | *data = sourcebuffer; |
1138 | *datasize = sourcesize; | |
031e5cce | 1139 | } else if (find_httpboot(shim_li->DeviceHandle)) { |
fd2d9f03 | 1140 | str16_to_str8(ImagePath, &netbootname); |
f892ac66 MTL |
1141 | efi_status = httpboot_fetch_buffer (image_handle, |
1142 | &sourcebuffer, | |
fd2d9f03 SM |
1143 | &sourcesize, |
1144 | netbootname); | |
f892ac66 | 1145 | if (EFI_ERROR(efi_status)) { |
fd2d9f03 SM |
1146 | perror(L"Unable to fetch HTTP image %a: %r\n", |
1147 | netbootname, efi_status); | |
62f0afa2 MTL |
1148 | return efi_status; |
1149 | } | |
e6ace38a SM |
1150 | *data = sourcebuffer; |
1151 | *datasize = sourcesize; | |
1c595706 | 1152 | } else { |
4ad234f1 MG |
1153 | /* |
1154 | * Read the new executable off disk | |
1155 | */ | |
e6ace38a | 1156 | efi_status = load_image(shim_li, data, datasize, *PathName); |
f892ac66 MTL |
1157 | if (EFI_ERROR(efi_status)) { |
1158 | perror(L"Failed to load image %s: %r\n", | |
1159 | PathName, efi_status); | |
b6f94dbe MTL |
1160 | PrintErrors(); |
1161 | ClearErrors(); | |
e6ace38a | 1162 | return efi_status; |
1c595706 | 1163 | } |
822d089e GCPL |
1164 | } |
1165 | ||
e6ace38a | 1166 | if (*datasize < 0) |
f892ac66 | 1167 | efi_status = EFI_INVALID_PARAMETER; |
e6ace38a SM |
1168 | |
1169 | return efi_status; | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Load and run an EFI executable | |
1174 | */ | |
1175 | EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath) | |
1176 | { | |
1177 | EFI_STATUS efi_status; | |
1178 | EFI_IMAGE_ENTRY_POINT entry_point; | |
1179 | EFI_PHYSICAL_ADDRESS alloc_address; | |
1180 | UINTN alloc_pages; | |
1181 | CHAR16 *PathName = NULL; | |
1182 | void *data = NULL; | |
1183 | int datasize = 0; | |
1184 | ||
1185 | efi_status = read_image(image_handle, ImagePath, &PathName, &data, | |
1186 | &datasize); | |
1187 | if (EFI_ERROR(efi_status)) | |
f892ac66 | 1188 | goto done; |
f892ac66 | 1189 | |
20f6cde6 MG |
1190 | /* |
1191 | * We need to modify the loaded image protocol entry before running | |
1192 | * the new binary, so back it up | |
1193 | */ | |
031e5cce SM |
1194 | CopyMem(&shim_li_bak, shim_li, sizeof(shim_li_bak)); |
1195 | ||
1196 | /* | |
1197 | * Update the loaded image with the second stage loader file path | |
1198 | */ | |
1199 | shim_li->FilePath = FileDevicePath(NULL, PathName); | |
1200 | if (!shim_li->FilePath) { | |
1201 | perror(L"Unable to update loaded image file path\n"); | |
1202 | efi_status = EFI_OUT_OF_RESOURCES; | |
1203 | goto restore; | |
1204 | } | |
822d089e | 1205 | |
20f6cde6 MG |
1206 | /* |
1207 | * Verify and, if appropriate, relocate and execute the executable | |
1208 | */ | |
031e5cce | 1209 | efi_status = handle_image(data, datasize, shim_li, &entry_point, |
f892ac66 MTL |
1210 | &alloc_address, &alloc_pages); |
1211 | if (EFI_ERROR(efi_status)) { | |
e50cfe37 | 1212 | perror(L"Failed to load image: %r\n", efi_status); |
b6f94dbe MTL |
1213 | PrintErrors(); |
1214 | ClearErrors(); | |
031e5cce | 1215 | goto restore; |
822d089e GCPL |
1216 | } |
1217 | ||
cbef697a PJ |
1218 | loader_is_participating = 0; |
1219 | ||
20f6cde6 MG |
1220 | /* |
1221 | * The binary is trusted and relocated. Run it | |
1222 | */ | |
f892ac66 | 1223 | efi_status = entry_point(image_handle, systab); |
822d089e | 1224 | |
031e5cce SM |
1225 | restore: |
1226 | restore_loaded_image(); | |
822d089e | 1227 | done: |
cbe21407 MG |
1228 | if (PathName) |
1229 | FreePool(PathName); | |
1230 | ||
1231 | if (data) | |
1232 | FreePool(data); | |
1233 | ||
822d089e GCPL |
1234 | return efi_status; |
1235 | } | |
1236 | ||
20f6cde6 MG |
1237 | /* |
1238 | * Load and run grub. If that fails because grub isn't trusted, load and | |
1239 | * run MokManager. | |
1240 | */ | |
db54b0a4 | 1241 | EFI_STATUS init_grub(EFI_HANDLE image_handle) |
b2fe1780 MG |
1242 | { |
1243 | EFI_STATUS efi_status; | |
d3819813 | 1244 | int use_fb = should_use_fallback(image_handle); |
f4b24734 | 1245 | |
d3819813 | 1246 | efi_status = start_image(image_handle, use_fb ? FALLBACK :second_stage); |
f4173af1 MTL |
1247 | if (efi_status == EFI_SECURITY_VIOLATION || |
1248 | efi_status == EFI_ACCESS_DENIED) { | |
ef8c9962 | 1249 | efi_status = start_image(image_handle, MOK_MANAGER); |
f892ac66 MTL |
1250 | if (EFI_ERROR(efi_status)) { |
1251 | console_print(L"start_image() returned %r\n", efi_status); | |
fd2d9f03 | 1252 | usleep(2000000); |
d3819813 MTL |
1253 | return efi_status; |
1254 | } | |
1255 | ||
1256 | efi_status = start_image(image_handle, | |
1257 | use_fb ? FALLBACK : second_stage); | |
1258 | } | |
1259 | ||
8529e0f7 SM |
1260 | // If the filename is invalid, or the file does not exist, |
1261 | // just fallback to the default loader. | |
1262 | if (!use_fb && (efi_status == EFI_INVALID_PARAMETER || | |
1263 | efi_status == EFI_NOT_FOUND)) { | |
1264 | console_print( | |
1265 | L"start_image() returned %r, falling back to default loader\n", | |
1266 | efi_status); | |
fd2d9f03 | 1267 | usleep(2000000); |
8529e0f7 SM |
1268 | load_options = NULL; |
1269 | load_options_size = 0; | |
1270 | efi_status = start_image(image_handle, DEFAULT_LOADER); | |
d3819813 MTL |
1271 | } |
1272 | ||
031e5cce | 1273 | if (EFI_ERROR(efi_status)) { |
8529e0f7 | 1274 | console_print(L"start_image() returned %r\n", efi_status); |
fd2d9f03 | 1275 | usleep(2000000); |
031e5cce SM |
1276 | } |
1277 | ||
8529e0f7 | 1278 | return efi_status; |
f4173af1 MTL |
1279 | } |
1280 | ||
09e2c939 GCPL |
1281 | /* |
1282 | * Check the load options to specify the second stage loader | |
1283 | */ | |
1284 | EFI_STATUS set_second_stage (EFI_HANDLE image_handle) | |
1285 | { | |
f892ac66 | 1286 | EFI_STATUS efi_status; |
f4173af1 | 1287 | EFI_LOADED_IMAGE *li = NULL; |
8529e0f7 SM |
1288 | |
1289 | second_stage = DEFAULT_LOADER; | |
09e2c939 GCPL |
1290 | load_options = NULL; |
1291 | load_options_size = 0; | |
1292 | ||
8529e0f7 SM |
1293 | efi_status = BS->HandleProtocol(image_handle, &LoadedImageProtocol, |
1294 | (void **) &li); | |
f892ac66 MTL |
1295 | if (EFI_ERROR(efi_status)) { |
1296 | perror (L"Failed to get load options: %r\n", efi_status); | |
1297 | return efi_status; | |
09e2c939 GCPL |
1298 | } |
1299 | ||
8529e0f7 | 1300 | #if defined(DISABLE_REMOVABLE_LOAD_OPTIONS) |
f892ac66 | 1301 | /* |
8529e0f7 SM |
1302 | * boot services build very strange load options, and we might misparse them, |
1303 | * causing boot failures on removable media. | |
f892ac66 | 1304 | */ |
8529e0f7 SM |
1305 | if (is_removable_media_path(li)) { |
1306 | dprint("Invoked from removable media path, ignoring boot options"); | |
f892ac66 | 1307 | return EFI_SUCCESS; |
031e5cce | 1308 | } |
8529e0f7 | 1309 | #endif |
031e5cce | 1310 | |
8529e0f7 SM |
1311 | efi_status = parse_load_options(li); |
1312 | if (EFI_ERROR(efi_status)) { | |
1313 | perror (L"Failed to get load options: %r\n", efi_status); | |
1314 | return efi_status; | |
09e2c939 GCPL |
1315 | } |
1316 | ||
1317 | return EFI_SUCCESS; | |
1318 | } | |
1319 | ||
b6f94dbe MTL |
1320 | static void |
1321 | init_openssl(void) | |
1322 | { | |
b6f94dbe | 1323 | OPENSSL_init(); |
b6f94dbe MTL |
1324 | ERR_load_ERR_strings(); |
1325 | ERR_load_BN_strings(); | |
1326 | ERR_load_RSA_strings(); | |
1327 | ERR_load_DH_strings(); | |
1328 | ERR_load_EVP_strings(); | |
1329 | ERR_load_BUF_strings(); | |
1330 | ERR_load_OBJ_strings(); | |
1331 | ERR_load_PEM_strings(); | |
1332 | ERR_load_X509_strings(); | |
1333 | ERR_load_ASN1_strings(); | |
1334 | ERR_load_CONF_strings(); | |
1335 | ERR_load_CRYPTO_strings(); | |
1336 | ERR_load_COMP_strings(); | |
1337 | ERR_load_BIO_strings(); | |
1338 | ERR_load_PKCS7_strings(); | |
1339 | ERR_load_X509V3_strings(); | |
1340 | ERR_load_PKCS12_strings(); | |
1341 | ERR_load_RAND_strings(); | |
1342 | ERR_load_DSO_strings(); | |
1343 | ERR_load_OCSP_strings(); | |
1344 | } | |
1345 | ||
cf90edff PJ |
1346 | static SHIM_LOCK shim_lock_interface; |
1347 | static EFI_HANDLE shim_lock_handle; | |
1348 | ||
1349 | EFI_STATUS | |
1350 | install_shim_protocols(void) | |
1351 | { | |
f892ac66 | 1352 | SHIM_LOCK *shim_lock; |
cf90edff | 1353 | EFI_STATUS efi_status; |
d3819813 | 1354 | |
f892ac66 MTL |
1355 | /* |
1356 | * Did another instance of shim earlier already install the | |
1357 | * protocol? If so, get rid of it. | |
1358 | * | |
1359 | * We have to uninstall shim's protocol here, because if we're | |
1360 | * On the fallback.efi path, then our call pathway is: | |
1361 | * | |
1362 | * shim->fallback->shim->grub | |
1363 | * ^ ^ ^ | |
1364 | * | | \- gets protocol #0 | |
1365 | * | \- installs its protocol (#1) | |
1366 | * \- installs its protocol (#0) | |
1367 | * and if we haven't removed this, then grub will get the *first* | |
1368 | * shim's protocol, but it'll get the second shim's systab | |
1369 | * replacements. So even though it will participate and verify | |
1370 | * the kernel, the systab never finds out. | |
1371 | */ | |
1372 | efi_status = LibLocateProtocol(&SHIM_LOCK_GUID, (VOID **)&shim_lock); | |
1373 | if (!EFI_ERROR(efi_status)) | |
1374 | uninstall_shim_protocols(); | |
d3819813 | 1375 | |
cf90edff PJ |
1376 | /* |
1377 | * Install the protocol | |
1378 | */ | |
8529e0f7 SM |
1379 | efi_status = BS->InstallProtocolInterface(&shim_lock_handle, |
1380 | &SHIM_LOCK_GUID, | |
1381 | EFI_NATIVE_INTERFACE, | |
1382 | &shim_lock_interface); | |
cf90edff PJ |
1383 | if (EFI_ERROR(efi_status)) { |
1384 | console_error(L"Could not install security protocol", | |
1385 | efi_status); | |
1386 | return efi_status; | |
1387 | } | |
1388 | ||
f892ac66 MTL |
1389 | if (!secure_mode()) |
1390 | return EFI_SUCCESS; | |
1391 | ||
cf90edff PJ |
1392 | #if defined(OVERRIDE_SECURITY_POLICY) |
1393 | /* | |
1394 | * Install the security protocol hook | |
1395 | */ | |
1396 | security_policy_install(shim_verify); | |
1397 | #endif | |
1398 | ||
1399 | return EFI_SUCCESS; | |
1400 | } | |
1401 | ||
1402 | void | |
1403 | uninstall_shim_protocols(void) | |
db54b0a4 | 1404 | { |
f892ac66 MTL |
1405 | /* |
1406 | * If we're back here then clean everything up before exiting | |
1407 | */ | |
8529e0f7 SM |
1408 | BS->UninstallProtocolInterface(shim_lock_handle, &SHIM_LOCK_GUID, |
1409 | &shim_lock_interface); | |
d3819813 MTL |
1410 | |
1411 | if (!secure_mode()) | |
1412 | return; | |
1413 | ||
cf90edff PJ |
1414 | #if defined(OVERRIDE_SECURITY_POLICY) |
1415 | /* | |
1416 | * Clean up the security protocol hook | |
1417 | */ | |
1418 | security_policy_uninstall(); | |
1419 | #endif | |
cf90edff PJ |
1420 | } |
1421 | ||
fd2d9f03 SM |
1422 | static void |
1423 | check_section_helper(char *section_name, int len, void **pointer, | |
1424 | EFI_IMAGE_SECTION_HEADER *Section, void *data, | |
1425 | int datasize, size_t minsize) | |
1426 | { | |
1427 | if (CompareMem(Section->Name, section_name, len) == 0) { | |
1428 | *pointer = ImageAddress(data, datasize, Section->PointerToRawData); | |
1429 | if (Section->SizeOfRawData < minsize) { | |
1430 | dprint(L"found and rejected %.*a bad size\n", len, section_name); | |
1431 | dprint(L"minsize: %d\n", minsize); | |
1432 | dprint(L"rawsize: %d\n", Section->SizeOfRawData); | |
1433 | return ; | |
1434 | } | |
1435 | if (!*pointer) { | |
1436 | return ; | |
1437 | } | |
1438 | dprint(L"found %.*a\n", len, section_name); | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | #define check_section(section_name, pointer, section, data, datasize, minsize) \ | |
1443 | check_section_helper(section_name, sizeof(section_name) - 1, pointer, \ | |
1444 | section, data, datasize, minsize) | |
1445 | ||
1446 | EFI_STATUS | |
1447 | load_revocations_file(EFI_HANDLE image_handle, CHAR16 *PathName) | |
1448 | { | |
1449 | EFI_STATUS efi_status = EFI_SUCCESS; | |
1450 | PE_COFF_LOADER_IMAGE_CONTEXT context; | |
1451 | EFI_IMAGE_SECTION_HEADER *Section; | |
1452 | int datasize = 0; | |
1453 | void *data = NULL; | |
1454 | unsigned int i; | |
1455 | char *sbat_var_automatic = NULL; | |
1456 | char *sbat_var_latest = NULL; | |
1457 | uint8_t *ssps_automatic = NULL; | |
1458 | uint8_t *sspv_automatic = NULL; | |
1459 | uint8_t *ssps_latest = NULL; | |
1460 | uint8_t *sspv_latest = NULL; | |
1461 | ||
1462 | efi_status = read_image(image_handle, L"revocations.efi", &PathName, | |
1463 | &data, &datasize); | |
1464 | if (EFI_ERROR(efi_status)) | |
1465 | return efi_status; | |
1466 | ||
1467 | efi_status = verify_image(data, datasize, shim_li, &context); | |
1468 | if (EFI_ERROR(efi_status)) { | |
1469 | dprint(L"revocations failed to verify\n"); | |
1470 | return efi_status; | |
1471 | } | |
1472 | dprint(L"verified revocations\n"); | |
1473 | ||
1474 | Section = context.FirstSection; | |
1475 | for (i = 0; i < context.NumberOfSections; i++, Section++) { | |
1476 | dprint(L"checking section \"%c%c%c%c%c%c%c%c\"\n", (char *)Section->Name); | |
1477 | check_section(".sbata\0\0", (void **)&sbat_var_automatic, Section, | |
1478 | data, datasize, sizeof(SBAT_VAR_ORIGINAL)); | |
1479 | check_section(".sbatl\0\0", (void **)&sbat_var_latest, Section, | |
1480 | data, datasize, sizeof(SBAT_VAR_ORIGINAL)); | |
1481 | check_section(".sspva\0\0", (void **)&sspv_automatic, Section, | |
1482 | data, datasize, SSPVER_SIZE); | |
1483 | check_section(".sspsa\0\0", (void **)&ssps_automatic, Section, | |
1484 | data, datasize, SSPSIG_SIZE); | |
1485 | check_section(".sspvl\0\0", (void **)&sspv_latest, Section, | |
1486 | data, datasize, SSPVER_SIZE); | |
1487 | check_section(".sspsl\0\0", (void **)&ssps_latest, Section, | |
1488 | data, datasize, SSPSIG_SIZE); | |
1489 | } | |
1490 | ||
1491 | if (sbat_var_latest && sbat_var_automatic) { | |
1492 | dprint(L"attempting to update SBAT_LEVEL\n"); | |
1493 | efi_status = set_sbat_uefi_variable(sbat_var_automatic, | |
1494 | sbat_var_latest); | |
1495 | } else { | |
1496 | dprint(L"no data for SBAT_LEVEL\n"); | |
1497 | } | |
1498 | ||
1499 | if ((sspv_automatic && ssps_automatic) || (sspv_latest && ssps_latest)) { | |
1500 | dprint(L"attempting to update SkuSiPolicy\n"); | |
1501 | efi_status = set_ssp_uefi_variable(sspv_automatic, ssps_automatic, | |
1502 | sspv_latest, ssps_latest); | |
1503 | ||
1504 | } else { | |
1505 | dprint(L"no data for SkuSiPolicy\n"); | |
1506 | } | |
1507 | ||
1508 | FreePool(data); | |
1509 | return efi_status; | |
1510 | } | |
1511 | ||
e6ace38a SM |
1512 | EFI_STATUS |
1513 | load_cert_file(EFI_HANDLE image_handle, CHAR16 *filename, CHAR16 *PathName) | |
1514 | { | |
1515 | EFI_STATUS efi_status; | |
e6ace38a SM |
1516 | PE_COFF_LOADER_IMAGE_CONTEXT context; |
1517 | EFI_IMAGE_SECTION_HEADER *Section; | |
1518 | EFI_SIGNATURE_LIST *certlist; | |
1519 | void *pointer; | |
1520 | UINT32 original; | |
1521 | int datasize = 0; | |
1522 | void *data = NULL; | |
1523 | int i; | |
1524 | ||
1525 | efi_status = read_image(image_handle, filename, &PathName, | |
1526 | &data, &datasize); | |
1527 | if (EFI_ERROR(efi_status)) | |
1528 | return efi_status; | |
1529 | ||
2dd2f760 | 1530 | efi_status = verify_image(data, datasize, shim_li, &context); |
e6ace38a SM |
1531 | if (EFI_ERROR(efi_status)) |
1532 | return efi_status; | |
1533 | ||
1534 | Section = context.FirstSection; | |
1535 | for (i = 0; i < context.NumberOfSections; i++, Section++) { | |
1536 | if (CompareMem(Section->Name, ".db\0\0\0\0\0", 8) == 0) { | |
1537 | original = user_cert_size; | |
1538 | if (Section->SizeOfRawData < sizeof(EFI_SIGNATURE_LIST)) { | |
1539 | continue; | |
1540 | } | |
1541 | pointer = ImageAddress(data, datasize, | |
1542 | Section->PointerToRawData); | |
1543 | if (!pointer) { | |
1544 | continue; | |
1545 | } | |
1546 | certlist = pointer; | |
1547 | user_cert_size += certlist->SignatureListSize;; | |
1548 | user_cert = ReallocatePool(user_cert, original, | |
1549 | user_cert_size); | |
2dd2f760 SM |
1550 | CopyMem(user_cert + original, pointer, |
1551 | certlist->SignatureListSize); | |
e6ace38a SM |
1552 | } |
1553 | } | |
1554 | FreePool(data); | |
1555 | return EFI_SUCCESS; | |
1556 | } | |
1557 | ||
fd2d9f03 SM |
1558 | /* |
1559 | * Read additional certificates and SBAT Level requirements from files | |
1560 | * (after verifying signatures) | |
1561 | */ | |
e6ace38a | 1562 | EFI_STATUS |
fd2d9f03 | 1563 | load_unbundled_trust(EFI_HANDLE image_handle) |
e6ace38a SM |
1564 | { |
1565 | EFI_STATUS efi_status; | |
1566 | EFI_LOADED_IMAGE *li = NULL; | |
1567 | CHAR16 *PathName = NULL; | |
1568 | EFI_FILE *root, *dir; | |
1569 | EFI_FILE_INFO *info; | |
1570 | EFI_HANDLE device; | |
1571 | EFI_FILE_IO_INTERFACE *drive; | |
1572 | UINTN buffersize = 0; | |
1573 | void *buffer = NULL; | |
fd2d9f03 | 1574 | BOOLEAN search_revocations = TRUE; |
e6ace38a SM |
1575 | |
1576 | efi_status = gBS->HandleProtocol(image_handle, &EFI_LOADED_IMAGE_GUID, | |
1577 | (void **)&li); | |
1578 | if (EFI_ERROR(efi_status)) { | |
1579 | perror(L"Unable to init protocol\n"); | |
1580 | return efi_status; | |
1581 | } | |
1582 | ||
1583 | efi_status = generate_path_from_image_path(li, L"", &PathName); | |
1584 | if (EFI_ERROR(efi_status)) | |
1585 | goto done; | |
1586 | ||
1587 | device = li->DeviceHandle; | |
1588 | efi_status = gBS->HandleProtocol(device, &EFI_SIMPLE_FILE_SYSTEM_GUID, | |
1589 | (void **)&drive); | |
1590 | if (EFI_ERROR(efi_status)) { | |
fd2d9f03 SM |
1591 | dprint(L"Failed to find fs on local drive (netboot?): %r \n", |
1592 | efi_status); | |
1593 | /* | |
1594 | * Network boot cases do not support reading a directory. Try | |
1595 | * to read revocations.efi to pull in any unbundled SBATLevel | |
1596 | * updates unconditionally in those cases. This may produce | |
1597 | * console noise when the file is not present. | |
1598 | */ | |
1599 | load_cert_file(image_handle, REVOCATIONFILE, PathName); | |
e6ace38a SM |
1600 | goto done; |
1601 | } | |
1602 | ||
1603 | efi_status = drive->OpenVolume(drive, &root); | |
1604 | if (EFI_ERROR(efi_status)) { | |
1605 | perror(L"Failed to open fs: %r\n", efi_status); | |
1606 | goto done; | |
1607 | } | |
1608 | ||
1609 | efi_status = root->Open(root, &dir, PathName, EFI_FILE_MODE_READ, 0); | |
1610 | if (EFI_ERROR(efi_status)) { | |
1611 | perror(L"Failed to open %s - %r\n", PathName, efi_status); | |
1612 | goto done; | |
1613 | } | |
1614 | ||
fd2d9f03 SM |
1615 | if (!secure_mode()) |
1616 | goto done; | |
1617 | ||
1618 | ||
1619 | while (true) { | |
1620 | UINTN old = buffersize; | |
1621 | ||
e6ace38a SM |
1622 | efi_status = dir->Read(dir, &buffersize, buffer); |
1623 | if (efi_status == EFI_BUFFER_TOO_SMALL) { | |
fd2d9f03 SM |
1624 | if (buffersize == old) { |
1625 | /* | |
1626 | * Some UEFI drivers or firmwares are not compliant with | |
1627 | * the EFI_FILE_PROTOCOL.Read() specs and do not return the | |
1628 | * required buffer size along with EFI_BUFFER_TOO_SMALL. | |
1629 | * Work around this by progressively increasing the buffer | |
1630 | * size, up to a certain point, until the call succeeds. | |
1631 | */ | |
1632 | perror(L"Error reading directory %s - non-compliant UEFI driver or firmware!\n", | |
1633 | PathName); | |
1634 | buffersize = (buffersize < 4) ? 4 : buffersize * 2; | |
1635 | if (buffersize > 1024) | |
1636 | goto done; | |
1637 | } | |
e6ace38a | 1638 | buffer = ReallocatePool(buffer, old, buffersize); |
fd2d9f03 SM |
1639 | if (buffer == NULL) { |
1640 | perror(L"Failed to read directory %s - %r\n", | |
1641 | PathName, EFI_OUT_OF_RESOURCES); | |
1642 | goto done; | |
1643 | } | |
e6ace38a SM |
1644 | continue; |
1645 | } else if (EFI_ERROR(efi_status)) { | |
1646 | perror(L"Failed to read directory %s - %r\n", PathName, | |
fd2d9f03 | 1647 | efi_status); |
e6ace38a SM |
1648 | goto done; |
1649 | } | |
1650 | ||
1651 | info = (EFI_FILE_INFO *)buffer; | |
fd2d9f03 SM |
1652 | if (buffersize == 0 || !info) { |
1653 | if (search_revocations) { | |
1654 | search_revocations = FALSE; | |
1655 | efi_status = root->Open(root, &dir, PathName, | |
1656 | EFI_FILE_MODE_READ, 0); | |
1657 | if (EFI_ERROR(efi_status)) { | |
1658 | perror(L"Failed to open %s - %r\n", | |
1659 | PathName, efi_status); | |
1660 | goto done; | |
1661 | } | |
1662 | continue; | |
1663 | } else { | |
1664 | goto done; | |
1665 | } | |
1666 | } | |
e6ace38a | 1667 | |
fd2d9f03 SM |
1668 | /* |
1669 | * In the event that there are unprocessed revocation | |
1670 | * additions, they could be intended to ban any *new* trust | |
1671 | * anchors we find here. With that in mind, we always want to | |
1672 | * do a pass of loading revocations before we try to add | |
1673 | * anything new to our allowlist. This is done by making two | |
1674 | * passes over the directory, first to search for the | |
1675 | * revocations.efi file then to search for shim_certificate.efi | |
1676 | */ | |
1677 | if (search_revocations && | |
1678 | StrCaseCmp(info->FileName, REVOCATIONFILE) == 0) { | |
1679 | load_revocations_file(image_handle, PathName); | |
1680 | search_revocations = FALSE; | |
1681 | efi_status = root->Open(root, &dir, PathName, | |
1682 | EFI_FILE_MODE_READ, 0); | |
1683 | if (EFI_ERROR(efi_status)) { | |
1684 | perror(L"Failed to open %s - %r\n", | |
1685 | PathName, efi_status); | |
1686 | goto done; | |
1687 | } | |
1688 | } | |
1689 | ||
1690 | if (!search_revocations && | |
1691 | StrCaseCmp(info->FileName, L"shim_certificate.efi") == 0) { | |
e6ace38a SM |
1692 | load_cert_file(image_handle, info->FileName, PathName); |
1693 | } | |
1694 | } | |
1695 | done: | |
1696 | FreePool(buffer); | |
1697 | FreePool(PathName); | |
1698 | return efi_status; | |
1699 | } | |
1700 | ||
d3819813 MTL |
1701 | EFI_STATUS |
1702 | shim_init(void) | |
1703 | { | |
031e5cce SM |
1704 | EFI_STATUS efi_status; |
1705 | ||
f892ac66 | 1706 | dprint(L"%a", shim_version); |
d3819813 MTL |
1707 | |
1708 | /* Set the second stage loader */ | |
031e5cce SM |
1709 | efi_status = set_second_stage(global_image_handle); |
1710 | if (EFI_ERROR(efi_status)) { | |
1711 | perror(L"set_second_stage() failed: %r\n", efi_status); | |
1712 | return efi_status; | |
1713 | } | |
d3819813 MTL |
1714 | |
1715 | if (secure_mode()) { | |
031e5cce | 1716 | if (vendor_authorized_size || vendor_deauthorized_size) { |
d3819813 MTL |
1717 | /* |
1718 | * If shim includes its own certificates then ensure | |
1719 | * that anything it boots has performed some | |
1720 | * validation of the next image. | |
1721 | */ | |
1722 | hook_system_services(systab); | |
1723 | loader_is_participating = 0; | |
1724 | } | |
1725 | ||
d3819813 | 1726 | } |
f892ac66 | 1727 | |
031e5cce SM |
1728 | hook_exit(systab); |
1729 | ||
1730 | efi_status = install_shim_protocols(); | |
1731 | if (EFI_ERROR(efi_status)) | |
1732 | perror(L"install_shim_protocols() failed: %r\n", efi_status); | |
1733 | ||
1734 | return efi_status; | |
d3819813 MTL |
1735 | } |
1736 | ||
1737 | void | |
1738 | shim_fini(void) | |
1739 | { | |
031e5cce SM |
1740 | if (secure_mode()) |
1741 | cleanup_sbat_var(&sbat_var); | |
1742 | ||
f892ac66 MTL |
1743 | /* |
1744 | * Remove our protocols | |
1745 | */ | |
1746 | uninstall_shim_protocols(); | |
1747 | ||
d3819813 | 1748 | if (secure_mode()) { |
d3819813 MTL |
1749 | |
1750 | /* | |
1751 | * Remove our hooks from system services. | |
1752 | */ | |
1753 | unhook_system_services(); | |
d3819813 MTL |
1754 | } |
1755 | ||
031e5cce SM |
1756 | unhook_exit(); |
1757 | ||
f892ac66 | 1758 | console_fini(); |
d3819813 MTL |
1759 | } |
1760 | ||
1761 | extern EFI_STATUS | |
1762 | efi_main(EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab); | |
1763 | ||
1764 | static void | |
1765 | __attribute__((__optimize__("0"))) | |
1766 | debug_hook(void) | |
1767 | { | |
d3819813 MTL |
1768 | UINT8 *data = NULL; |
1769 | UINTN dataSize = 0; | |
1770 | EFI_STATUS efi_status; | |
031e5cce | 1771 | register volatile UINTN x = 0; |
d3819813 MTL |
1772 | extern char _text, _data; |
1773 | ||
1774 | if (x) | |
1775 | return; | |
1776 | ||
e6ace38a | 1777 | efi_status = get_variable(DEBUG_VAR_NAME, &data, &dataSize, |
f892ac66 | 1778 | SHIM_LOCK_GUID); |
d3819813 MTL |
1779 | if (EFI_ERROR(efi_status)) { |
1780 | return; | |
1781 | } | |
1782 | ||
f892ac66 MTL |
1783 | FreePool(data); |
1784 | ||
1785 | console_print(L"add-symbol-file "DEBUGDIR | |
1786 | L"shim" EFI_ARCH L".efi.debug 0x%08x -s .data 0x%08x\n", | |
1787 | &_text, &_data); | |
d3819813 | 1788 | |
f892ac66 | 1789 | console_print(L"Pausing for debugger attachment.\n"); |
031e5cce | 1790 | console_print(L"To disable this, remove the EFI variable %s-%g .\n", |
e6ace38a | 1791 | DEBUG_VAR_NAME, &SHIM_LOCK_GUID); |
d3819813 MTL |
1792 | x = 1; |
1793 | while (x++) { | |
1794 | /* Make this so it can't /totally/ DoS us. */ | |
1795 | #if defined(__x86_64__) || defined(__i386__) || defined(__i686__) | |
1796 | if (x > 4294967294ULL) | |
1797 | break; | |
d3819813 MTL |
1798 | #elif defined(__aarch64__) |
1799 | if (x > 1000) | |
1800 | break; | |
d3819813 MTL |
1801 | #else |
1802 | if (x > 12000) | |
1803 | break; | |
d3819813 | 1804 | #endif |
8529e0f7 | 1805 | wait_for_debug(); |
d3819813 MTL |
1806 | } |
1807 | x = 1; | |
1808 | } | |
1809 | ||
031e5cce SM |
1810 | typedef enum { |
1811 | COLD_RESET, | |
1812 | EXIT_FAILURE, | |
1813 | EXIT_SUCCESS, // keep this one last | |
1814 | } devel_egress_action; | |
1815 | ||
1816 | void | |
1817 | devel_egress(devel_egress_action action UNUSED) | |
1818 | { | |
1819 | #ifdef ENABLE_SHIM_DEVEL | |
1820 | char *reasons[] = { | |
1821 | [COLD_RESET] = "reset", | |
1822 | [EXIT_FAILURE] = "exit", | |
1823 | }; | |
1824 | if (action == EXIT_SUCCESS) | |
1825 | return; | |
1826 | ||
1827 | console_print(L"Waiting to %a...", reasons[action]); | |
1828 | for (size_t sleepcount = 0; sleepcount < 10; sleepcount++) { | |
1829 | console_print(L"%d...", 10 - sleepcount); | |
fd2d9f03 | 1830 | usleep(1000000); |
031e5cce SM |
1831 | } |
1832 | console_print(L"\ndoing %a\n", action); | |
1833 | ||
1834 | if (action == COLD_RESET) | |
8529e0f7 | 1835 | RT->ResetSystem(EfiResetCold, EFI_SECURITY_VIOLATION, 0, NULL); |
031e5cce SM |
1836 | #endif |
1837 | } | |
1838 | ||
d3819813 MTL |
1839 | EFI_STATUS |
1840 | efi_main (EFI_HANDLE passed_image_handle, EFI_SYSTEM_TABLE *passed_systab) | |
cf90edff | 1841 | { |
0a232ca9 | 1842 | EFI_STATUS efi_status; |
f4173af1 | 1843 | EFI_HANDLE image_handle; |
db54b0a4 | 1844 | |
cbef697a PJ |
1845 | verification_method = VERIFIED_BY_NOTHING; |
1846 | ||
031e5cce SM |
1847 | vendor_authorized_size = cert_table.vendor_authorized_size; |
1848 | vendor_authorized = (UINT8 *)&cert_table + cert_table.vendor_authorized_offset; | |
1849 | ||
1850 | vendor_deauthorized_size = cert_table.vendor_deauthorized_size; | |
1851 | vendor_deauthorized = (UINT8 *)&cert_table + cert_table.vendor_deauthorized_offset; | |
1852 | ||
1853 | #if defined(ENABLE_SHIM_CERT) | |
1854 | build_cert_size = sizeof(shim_cert); | |
1855 | build_cert = shim_cert; | |
1856 | #endif /* defined(ENABLE_SHIM_CERT) */ | |
1857 | ||
f892ac66 | 1858 | CHAR16 *msgs[] = { |
031e5cce SM |
1859 | L"import_mok_state() failed", |
1860 | L"shim_init() failed", | |
1861 | L"import of SBAT data failed", | |
1862 | L"SBAT self-check failed", | |
8119f718 | 1863 | SBAT_VAR_NAME L" UEFI variable setting failed", |
f892ac66 MTL |
1864 | NULL |
1865 | }; | |
031e5cce SM |
1866 | enum { |
1867 | IMPORT_MOK_STATE, | |
1868 | SHIM_INIT, | |
1869 | IMPORT_SBAT, | |
1870 | SBAT_SELF_CHECK, | |
1871 | SET_SBAT, | |
1872 | } msg = IMPORT_MOK_STATE; | |
a1f28635 | 1873 | |
20f6cde6 MG |
1874 | /* |
1875 | * Set up the shim lock protocol so that grub and MokManager can | |
1876 | * call back in and use shim functions | |
1877 | */ | |
db54b0a4 | 1878 | shim_lock_interface.Verify = shim_verify; |
e50cfe37 GCPL |
1879 | shim_lock_interface.Hash = shim_hash; |
1880 | shim_lock_interface.Context = shim_read_header; | |
db54b0a4 MG |
1881 | |
1882 | systab = passed_systab; | |
f4173af1 | 1883 | image_handle = global_image_handle = passed_image_handle; |
db54b0a4 | 1884 | |
20f6cde6 MG |
1885 | /* |
1886 | * Ensure that gnu-efi functions are available | |
1887 | */ | |
db54b0a4 | 1888 | InitializeLib(image_handle, systab); |
031e5cce | 1889 | setup_verbosity(); |
db54b0a4 | 1890 | |
031e5cce SM |
1891 | dprint(L"vendor_authorized:0x%08lx vendor_authorized_size:%lu\n", |
1892 | vendor_authorized, vendor_authorized_size); | |
1893 | dprint(L"vendor_deauthorized:0x%08lx vendor_deauthorized_size:%lu\n", | |
1894 | vendor_deauthorized, vendor_deauthorized_size); | |
b6f94dbe | 1895 | |
d3819813 MTL |
1896 | /* |
1897 | * if SHIM_DEBUG is set, wait for a debugger to attach. | |
1898 | */ | |
1899 | debug_hook(); | |
0fb089ee | 1900 | |
fd2d9f03 | 1901 | efi_status = set_sbat_uefi_variable_internal(); |
031e5cce | 1902 | if (EFI_ERROR(efi_status) && secure_mode()) { |
8119f718 | 1903 | perror(L"%s variable initialization failed\n", SBAT_VAR_NAME); |
031e5cce SM |
1904 | msg = SET_SBAT; |
1905 | goto die; | |
1906 | } else if (EFI_ERROR(efi_status)) { | |
8119f718 SM |
1907 | dprint(L"%s variable initialization failed: %r\n", |
1908 | SBAT_VAR_NAME, efi_status); | |
031e5cce | 1909 | } |
fd2d9f03 SM |
1910 | efi_status = set_ssp_uefi_variable_internal(); |
1911 | if (EFI_ERROR(efi_status)) { | |
1912 | dprint(L"%s variable initialization failed: %r\n", | |
1913 | SSPVER_VAR_NAME, efi_status); | |
1914 | } | |
1915 | dprint(L"%s variable initialization done\n", SSPVER_VAR_NAME); | |
031e5cce SM |
1916 | |
1917 | if (secure_mode()) { | |
1918 | char *sbat_start = (char *)&_sbat; | |
1919 | char *sbat_end = (char *)&_esbat; | |
1920 | ||
1921 | INIT_LIST_HEAD(&sbat_var); | |
fd2d9f03 | 1922 | efi_status = parse_sbat_var(&sbat_var, NULL); |
031e5cce | 1923 | if (EFI_ERROR(efi_status)) { |
8119f718 SM |
1924 | perror(L"Parsing %s variable failed: %r\n", |
1925 | SBAT_VAR_NAME, efi_status); | |
031e5cce SM |
1926 | msg = IMPORT_SBAT; |
1927 | goto die; | |
1928 | } | |
1929 | ||
e6ace38a | 1930 | efi_status = verify_sbat_section(sbat_start, sbat_end - sbat_start - 1); |
031e5cce SM |
1931 | if (EFI_ERROR(efi_status)) { |
1932 | perror(L"Verifiying shim SBAT data failed: %r\n", | |
1933 | efi_status); | |
1934 | msg = SBAT_SELF_CHECK; | |
1935 | goto die; | |
1936 | } | |
8119f718 | 1937 | dprint(L"SBAT self-check succeeded\n"); |
031e5cce SM |
1938 | } |
1939 | ||
1940 | init_openssl(); | |
1941 | ||
fd2d9f03 SM |
1942 | efi_status = load_unbundled_trust(global_image_handle); |
1943 | if (EFI_ERROR(efi_status)) { | |
1944 | LogError(L"Failed to load addon certificates / sbat level\n"); | |
e6ace38a SM |
1945 | } |
1946 | ||
d3819813 | 1947 | /* |
f892ac66 MTL |
1948 | * Before we do anything else, validate our non-volatile, |
1949 | * boot-services-only state variables are what we think they are. | |
d3819813 | 1950 | */ |
f892ac66 | 1951 | efi_status = import_mok_state(image_handle); |
8529e0f7 SM |
1952 | if (!secure_mode() && |
1953 | (efi_status == EFI_INVALID_PARAMETER || | |
1954 | efi_status == EFI_OUT_OF_RESOURCES)) { | |
031e5cce SM |
1955 | /* |
1956 | * Make copy failures fatal only if secure_mode is enabled, or | |
8529e0f7 SM |
1957 | * the error was anything else than EFI_INVALID_PARAMETER or |
1958 | * EFI_OUT_OF_RESOURCES. | |
031e5cce SM |
1959 | * There are non-secureboot firmware implementations that don't |
1960 | * reserve enough EFI variable memory to fit the variable. | |
1961 | */ | |
1962 | console_print(L"Importing MOK states has failed: %s: %r\n", | |
1963 | msgs[msg], efi_status); | |
1964 | console_print(L"Continuing boot since secure mode is disabled"); | |
1965 | } else if (EFI_ERROR(efi_status)) { | |
f892ac66 MTL |
1966 | die: |
1967 | console_print(L"Something has gone seriously wrong: %s: %r\n", | |
1968 | msgs[msg], efi_status); | |
031e5cce SM |
1969 | #if defined(ENABLE_SHIM_DEVEL) |
1970 | devel_egress(COLD_RESET); | |
1971 | #else | |
fd2d9f03 | 1972 | usleep(5000000); |
8529e0f7 SM |
1973 | RT->ResetSystem(EfiResetShutdown, EFI_SECURITY_VIOLATION, |
1974 | 0, NULL); | |
031e5cce | 1975 | #endif |
d3819813 | 1976 | } |
09e2c939 | 1977 | |
fd2d9f03 SM |
1978 | /* |
1979 | * This variable is supposed to be set by second stages, so ensure it is | |
1980 | * not set when we are starting up. | |
1981 | */ | |
1982 | (void) del_variable(SHIM_RETAIN_PROTOCOL_VAR_NAME, SHIM_LOCK_GUID); | |
1983 | ||
d3819813 MTL |
1984 | efi_status = shim_init(); |
1985 | if (EFI_ERROR(efi_status)) { | |
031e5cce | 1986 | msg = SHIM_INIT; |
f892ac66 | 1987 | goto die; |
d3819813 MTL |
1988 | } |
1989 | ||
20f6cde6 MG |
1990 | /* |
1991 | * Tell the user that we're in insecure mode if necessary | |
1992 | */ | |
e60f1181 | 1993 | if (user_insecure_mode) { |
f892ac66 | 1994 | console_print(L"Booting in insecure mode\n"); |
fd2d9f03 | 1995 | usleep(2000000); |
9eaadb0d MG |
1996 | } |
1997 | ||
0283024e | 1998 | /* |
d3819813 | 1999 | * Hand over control to the second stage bootloader |
0283024e | 2000 | */ |
d3819813 | 2001 | efi_status = init_grub(image_handle); |
bc71a15e | 2002 | |
d3819813 | 2003 | shim_fini(); |
031e5cce | 2004 | devel_egress(EFI_ERROR(efi_status) ? EXIT_FAILURE : EXIT_SUCCESS); |
0a232ca9 | 2005 | return efi_status; |
b2fe1780 | 2006 | } |