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From dd3a5d71252a1f94e37f1a4c8841d253630b305a Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 23 Jul 2020 12:36:56 -0400
Subject: [PATCH 57/62] Add support for vendor_db built-in shim authorized
list.
Potential new signing strategies ( for example signing grub, fwupdate
and vmlinuz with separate certificates ) require shim to support a
vendor provided bundle of trusted certificates and hashes, which allows
shim to trust EFI binaries matching either certificate by signature or
hash in the vendor_db. Functionality is similar to vendor_dbx.
This also improves the mirroring quite a bit.
Upstream: pr#206
---
lib/variables.c | 55 +++--
mok.c | 502 ++++++++++++++++++++++++++++++--------------
shim.c | 27 +++
include/console.h | 3 +-
include/variables.h | 9 +-
shim.h | 7 +-
cert.S | 13 +-
Make.defaults | 3 +
README.tpm | 1 +
9 files changed, 437 insertions(+), 183 deletions(-)
diff --git a/lib/variables.c b/lib/variables.c
index 9c2e7d0ac2d..8123ae60fc9 100644
--- a/lib/variables.c
+++ b/lib/variables.c
@@ -25,32 +25,59 @@
#include "shim.h"
EFI_STATUS
-variable_create_esl(void *cert, int cert_len, EFI_GUID *type, EFI_GUID *owner,
- void **out, int *outlen)
+fill_esl(const uint8_t *data, const size_t data_len,
+ const EFI_GUID *type, const EFI_GUID *owner,
+ uint8_t *out, size_t *outlen)
{
- *outlen = cert_len + sizeof(EFI_SIGNATURE_LIST) + sizeof(EFI_GUID);
+ EFI_SIGNATURE_LIST *sl;
+ EFI_SIGNATURE_DATA *sd;
+ size_t needed = 0;
- *out = AllocateZeroPool(*outlen);
- if (!*out)
- return EFI_OUT_OF_RESOURCES;
+ if (!data || !data_len || !type || !outlen)
+ return EFI_INVALID_PARAMETER;
- EFI_SIGNATURE_LIST *sl = *out;
+ needed = sizeof(EFI_SIGNATURE_LIST) + sizeof(EFI_GUID) + data_len;
+ if (!out || *outlen < needed) {
+ *outlen = needed;
+ return EFI_BUFFER_TOO_SMALL;
+ }
+
+ *outlen = needed;
+ sl = (EFI_SIGNATURE_LIST *)out;
sl->SignatureHeaderSize = 0;
sl->SignatureType = *type;
- sl->SignatureSize = cert_len + sizeof(EFI_GUID);
- sl->SignatureListSize = *outlen;
-
- EFI_SIGNATURE_DATA *sd = *out + sizeof(EFI_SIGNATURE_LIST);
+ sl->SignatureSize = sizeof(EFI_GUID) + data_len;
+ sl->SignatureListSize = needed;
+ sd = (EFI_SIGNATURE_DATA *)(out + sizeof(EFI_SIGNATURE_LIST));
if (owner)
sd->SignatureOwner = *owner;
- CopyMem(sd->SignatureData, cert, cert_len);
+ CopyMem(sd->SignatureData, data, data_len);
return EFI_SUCCESS;
}
+EFI_STATUS
+variable_create_esl(const uint8_t *data, const size_t data_len,
+ const EFI_GUID *type, const EFI_GUID *owner,
+ uint8_t **out, size_t *outlen)
+{
+ EFI_STATUS efi_status;
+
+ *outlen = 0;
+ efi_status = fill_esl(data, data_len, type, owner, NULL, outlen);
+ if (efi_status != EFI_BUFFER_TOO_SMALL)
+ return efi_status;
+
+ *out = AllocateZeroPool(*outlen);
+ if (!*out)
+ return EFI_OUT_OF_RESOURCES;
+
+ return fill_esl(data, data_len, type, owner, *out, outlen);
+}
+
EFI_STATUS
CreateTimeBasedPayload(IN OUT UINTN * DataSize, IN OUT UINT8 ** Data)
{
@@ -137,9 +164,9 @@ SetSecureVariable(CHAR16 *var, UINT8 *Data, UINTN len, EFI_GUID owner,
return EFI_SECURITY_VIOLATION;
if (createtimebased) {
- int ds;
+ size_t ds;
efi_status = variable_create_esl(Data, len, &X509_GUID, NULL,
- (void **)&Cert, &ds);
+ (uint8_t **)&Cert, &ds);
if (EFI_ERROR(efi_status)) {
console_print(L"Failed to create %s certificate %d\n",
var, efi_status);
diff --git a/mok.c b/mok.c
index 089ea6bfc9a..e69857f3c37 100644
--- a/mok.c
+++ b/mok.c
@@ -5,6 +5,8 @@
#include "shim.h"
+#include <stdint.h>
+
/*
* Check if a variable exists
*/
@@ -47,6 +49,15 @@ static EFI_STATUS check_mok_request(EFI_HANDLE image_handle)
return EFI_SUCCESS;
}
+typedef enum {
+ VENDOR_ADDEND_DB,
+ VENDOR_ADDEND_X509,
+ VENDOR_ADDEND_NONE,
+} vendor_addend_category_t;
+
+struct mok_state_variable;
+typedef vendor_addend_category_t (vendor_addend_categorizer_t)(struct mok_state_variable *);
+
/*
* MoK variables that need to have their storage validated.
*
@@ -58,18 +69,20 @@ struct mok_state_variable {
char *name8;
CHAR16 *rtname;
EFI_GUID *guid;
+
UINT8 *data;
UINTN data_size;
+
/*
- * These two are indirect pointers just to make initialization
- * saner...
+ * These are indirect pointers just to make initialization saner...
*/
- UINT8 **addend_source;
+ vendor_addend_categorizer_t *categorize_addend;
+ UINT8 **addend;
UINT32 *addend_size;
-#if defined(ENABLE_SHIM_CERT)
+
UINT8 **build_cert;
UINT32 *build_cert_size;
-#endif /* defined(ENABLE_SHIM_CERT) */
+
UINT32 yes_attr;
UINT32 no_attr;
UINT32 flags;
@@ -77,6 +90,28 @@ struct mok_state_variable {
UINT8 *state;
};
+static vendor_addend_category_t
+categorize_authorized(struct mok_state_variable *v)
+{
+ if (!(v->addend && v->addend_size &&
+ *v->addend && *v->addend_size)) {
+ return VENDOR_ADDEND_NONE;
+ }
+
+ return vendor_authorized_category;
+}
+
+static vendor_addend_category_t
+categorize_deauthorized(struct mok_state_variable *v)
+{
+ if (!(v->addend && v->addend_size &&
+ *v->addend && *v->addend_size)) {
+ return VENDOR_ADDEND_NONE;
+ }
+
+ return VENDOR_ADDEND_DB;
+}
+
#define MOK_MIRROR_KEYDB 0x01
#define MOK_MIRROR_DELETE_FIRST 0x02
#define MOK_VARIABLE_MEASURE 0x04
@@ -90,8 +125,9 @@ struct mok_state_variable mok_state_variables[] = {
.yes_attr = EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_NON_VOLATILE,
.no_attr = EFI_VARIABLE_RUNTIME_ACCESS,
- .addend_source = &vendor_cert,
- .addend_size = &vendor_cert_size,
+ .categorize_addend = categorize_authorized,
+ .addend = &vendor_authorized,
+ .addend_size = &vendor_authorized_size,
#if defined(ENABLE_SHIM_CERT)
.build_cert = &build_cert,
.build_cert_size = &build_cert_size,
@@ -107,6 +143,9 @@ struct mok_state_variable mok_state_variables[] = {
.yes_attr = EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_NON_VOLATILE,
.no_attr = EFI_VARIABLE_RUNTIME_ACCESS,
+ .categorize_addend = categorize_deauthorized,
+ .addend = &vendor_deauthorized,
+ .addend_size = &vendor_deauthorized_size,
.flags = MOK_MIRROR_KEYDB |
MOK_VARIABLE_LOG,
.pcr = 14,
@@ -136,123 +175,253 @@ struct mok_state_variable mok_state_variables[] = {
{ NULL, }
};
-static inline BOOLEAN nonnull(1)
-check_vendor_cert(struct mok_state_variable *v)
-{
- return (v->addend_source && v->addend_size &&
- *v->addend_source && *v->addend_size) ? TRUE : FALSE;
-}
+#define should_mirror_addend(v) (((v)->categorize_addend) && ((v)->categorize_addend(v) != VENDOR_ADDEND_NONE))
-#if defined(ENABLE_SHIM_CERT)
static inline BOOLEAN nonnull(1)
-check_build_cert(struct mok_state_variable *v)
+should_mirror_build_cert(struct mok_state_variable *v)
{
return (v->build_cert && v->build_cert_size &&
*v->build_cert && *v->build_cert_size) ? TRUE : FALSE;
}
-#define check_addend(v) (check_vendor_cert(v) || check_build_cert(v))
-#else
-#define check_addend(v) check_vendor_cert(v)
-#endif /* defined(ENABLE_SHIM_CERT) */
+
+static const uint8_t null_sha256[32] = { 0, };
static EFI_STATUS nonnull(1)
mirror_one_mok_variable(struct mok_state_variable *v)
{
EFI_STATUS efi_status = EFI_SUCCESS;
- void *FullData = NULL;
- UINTN FullDataSize = 0;
+ uint8_t *FullData = NULL;
+ size_t FullDataSize = 0;
+ vendor_addend_category_t addend_category = VENDOR_ADDEND_NONE;
uint8_t *p = NULL;
- if ((v->flags & MOK_MIRROR_KEYDB) && check_addend(v)) {
- EFI_SIGNATURE_LIST *CertList = NULL;
- EFI_SIGNATURE_DATA *CertData = NULL;
-#if defined(ENABLE_SHIM_CERT)
- FullDataSize = v->data_size;
- if (check_build_cert(v)) {
- FullDataSize += sizeof (*CertList)
- + sizeof (EFI_GUID)
- + *v->build_cert_size;
- }
- if (check_vendor_cert(v)) {
- FullDataSize += sizeof (*CertList)
- + sizeof (EFI_GUID)
- + *v->addend_size;
- }
-#else
- FullDataSize = v->data_size
- + sizeof (*CertList)
- + sizeof (EFI_GUID)
- + *v->addend_size;
-#endif /* defined(ENABLE_SHIM_CERT) */
- FullData = AllocatePool(FullDataSize);
- if (!FullData) {
- perror(L"Failed to allocate space for MokListRT\n");
- return EFI_OUT_OF_RESOURCES;
- }
- p = FullData;
+ size_t build_cert_esl_sz = 0, addend_esl_sz = 0;
- if (!EFI_ERROR(efi_status) && v->data_size > 0) {
- CopyMem(p, v->data, v->data_size);
- p += v->data_size;
- }
+ if (v->categorize_addend)
+ addend_category = v->categorize_addend(v);
-#if defined(ENABLE_SHIM_CERT)
- if (check_build_cert(v) == FALSE)
- goto skip_build_cert;
+ /*
+ * we're always mirroring the original data, whether this is an efi
+ * security database or not
+ */
+ dprint(L"v->data_size:%lu v->data:0x%08llx\n", v->data_size, v->data);
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n", FullDataSize, FullData);
+ if (v->data_size) {
+ FullDataSize = v->data_size;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n",
+ FullDataSize, FullData);
+ }
- CertList = (EFI_SIGNATURE_LIST *)p;
- p += sizeof (*CertList);
- CertData = (EFI_SIGNATURE_DATA *)p;
- p += sizeof (EFI_GUID);
+ /*
+ * if it is, there's more data
+ */
+ if (v->flags & MOK_MIRROR_KEYDB) {
- CertList->SignatureType = EFI_CERT_TYPE_X509_GUID;
- CertList->SignatureListSize = *v->build_cert_size
- + sizeof (*CertList)
- + sizeof (*CertData)
- -1;
- CertList->SignatureHeaderSize = 0;
- CertList->SignatureSize = *v->build_cert_size +
- sizeof (EFI_GUID);
+ /*
+ * We're mirroring (into) an efi security database, aka an
+ * array of efi_signature_list_t. Its layout goes like:
+ *
+ * existing_variable_data
+ * existing_variable_data_size
+ * if flags & MOK_MIRROR_KEYDB
+ * if build_cert
+ * build_cert_esl
+ * build_cert_header (always sz=0)
+ * build_cert_esd[0] { owner, data }
+ * if addend==vendor_db
+ * for n=[1..N]
+ * vendor_db_esl_n
+ * vendor_db_header_n (always sz=0)
+ * vendor_db_esd_n[m] {{ owner, data }, ... }
+ * elif addend==vendor_cert
+ * vendor_cert_esl
+ * vendor_cert_header (always sz=0)
+ * vendor_cert_esd[1] { owner, data }
+ *
+ * first we determine the size of the variable, then alloc
+ * and add the data.
+ */
- CertData->SignatureOwner = SHIM_LOCK_GUID;
- CopyMem(p, *v->build_cert, *v->build_cert_size);
+ /*
+ * first bit is existing data, but we added that above
+ */
- p += *v->build_cert_size;
+ /*
+ * then the build cert if it's there
+ */
+ if (should_mirror_build_cert(v)) {
+ efi_status = fill_esl(*v->build_cert,
+ *v->build_cert_size,
+ &EFI_CERT_TYPE_X509_GUID,
+ &SHIM_LOCK_GUID,
+ NULL, &build_cert_esl_sz);
+ if (efi_status != EFI_BUFFER_TOO_SMALL) {
+ perror(L"Could not add built-in cert to %s: %r\n",
+ v->name, efi_status);
+ return efi_status;
+ }
+ FullDataSize += build_cert_esl_sz;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n",
+ FullDataSize, FullData);
+ }
- if (check_vendor_cert(v) == FALSE)
- goto skip_vendor_cert;
-skip_build_cert:
-#endif /* defined(ENABLE_SHIM_CERT) */
+ /*
+ * then the addend data
+ */
+ switch (addend_category) {
+ case VENDOR_ADDEND_DB:
+ /*
+ * if it's an ESL already, we use it wholesale
+ */
+ FullDataSize += *v->addend_size;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n",
+ FullDataSize, FullData);
+ break;
+ case VENDOR_ADDEND_X509:
+ efi_status = fill_esl(*v->addend, *v->addend_size,
+ &EFI_CERT_TYPE_X509_GUID,
+ &SHIM_LOCK_GUID,
+ NULL, &addend_esl_sz);
+ if (efi_status != EFI_BUFFER_TOO_SMALL) {
+ perror(L"Could not add built-in cert to %s: %r\n",
+ v->name, efi_status);
+ return efi_status;
+ }
+ FullDataSize += addend_esl_sz;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n",
+ FullDataSize, FullData);
+ break;
+ default:
+ case VENDOR_ADDEND_NONE:
+ dprint(L"FullDataSize:%lu FullData:0x%08llx\n",
+ FullDataSize, FullData);
+ break;
+ }
+ }
- CertList = (EFI_SIGNATURE_LIST *)p;
- p += sizeof (*CertList);
- CertData = (EFI_SIGNATURE_DATA *)p;
- p += sizeof (EFI_GUID);
+ /*
+ * Now we have the full size
+ */
+ if (FullDataSize) {
+ /*
+ * allocate the buffer, or use the old one if it's just the
+ * existing data.
+ */
+ if (FullDataSize != v->data_size) {
+ dprint(L"FullDataSize:%lu FullData:0x%08llx allocating FullData\n",
+ FullDataSize, FullData);
+ FullData = AllocatePool(FullDataSize);
+ if (!FullData) {
+ FreePool(v->data);
+ v->data = NULL;
+ v->data_size = 0;
+ perror(L"Failed to allocate %lu bytes for %s\n",
+ FullDataSize, v->name);
+ return EFI_OUT_OF_RESOURCES;
+ }
+ p = FullData;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ if (v->data && v->data_size) {
+ CopyMem(p, v->data, v->data_size);
+ p += v->data_size;
+ }
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ } else {
+ FullData = v->data;
+ FullDataSize = v->data_size;
+ p = FullData + FullDataSize;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ v->data = NULL;
+ v->data_size = 0;
+ }
+ }
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
- CertList->SignatureType = EFI_CERT_TYPE_X509_GUID;
- CertList->SignatureListSize = *v->addend_size
- + sizeof (*CertList)
- + sizeof (*CertData)
- -1;
- CertList->SignatureHeaderSize = 0;
- CertList->SignatureSize = *v->addend_size + sizeof (EFI_GUID);
+ /*
+ * Now fill it.
+ */
+ if (v->flags & MOK_MIRROR_KEYDB) {
+ /*
+ * first bit is existing data, but again, we added that above
+ */
- CertData->SignatureOwner = SHIM_LOCK_GUID;
- CopyMem(p, *v->addend_source, *v->addend_size);
+ /*
+ * second is the build cert
+ */
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ if (should_mirror_build_cert(v)) {
+ efi_status = fill_esl(*v->build_cert,
+ *v->build_cert_size,
+ &EFI_CERT_TYPE_X509_GUID,
+ &SHIM_LOCK_GUID,
+ p, &build_cert_esl_sz);
+ if (EFI_ERROR(efi_status)) {
+ perror(L"Could not add built-in cert to %s: %r\n",
+ v->name, efi_status);
+ return efi_status;
+ }
+ p += build_cert_esl_sz;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ }
-#if defined(ENABLE_SHIM_CERT)
-skip_vendor_cert:
-#endif /* defined(ENABLE_SHIM_CERT) */
- if (v->data && v->data_size)
- FreePool(v->data);
- v->data = FullData;
- v->data_size = FullDataSize;
- } else {
- FullDataSize = v->data_size;
- FullData = v->data;
+ switch (addend_category) {
+ case VENDOR_ADDEND_DB:
+ CopyMem(p, *v->addend, *v->addend_size);
+ p += *v->addend_size;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ break;
+ case VENDOR_ADDEND_X509:
+ efi_status = fill_esl(*v->addend, *v->addend_size,
+ &EFI_CERT_TYPE_X509_GUID,
+ &SHIM_LOCK_GUID,
+ p, &addend_esl_sz);
+ if (EFI_ERROR(efi_status)) {
+ perror(L"Could not add built-in cert to %s: %r\n",
+ v->name, efi_status);
+ return efi_status;
+ }
+ p += addend_esl_sz;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ break;
+ default:
+ case VENDOR_ADDEND_NONE:
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
+ break;
+ }
+ }
+ /*
+ * We always want to create our key databases, so in this case we
+ * need a dummy entry
+ */
+ if ((v->flags & MOK_MIRROR_KEYDB) && FullDataSize == 0) {
+ efi_status = variable_create_esl(
+ null_sha256, sizeof(null_sha256),
+ &EFI_CERT_SHA256_GUID, &SHIM_LOCK_GUID,
+ &FullData, &FullDataSize);
+ if (EFI_ERROR(efi_status)) {
+ perror(L"Failed to allocate %lu bytes for %s\n",
+ FullDataSize, v->name);
+ return efi_status;
+ }
+ p = FullData + FullDataSize;
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
}
+ dprint(L"FullDataSize:%lu FullData:0x%08llx p:0x%08llx pos:%lld\n",
+ FullDataSize, FullData, p, p-(uintptr_t)FullData);
if (FullDataSize) {
+ dprint(L"Setting %s with %lu bytes of data\n",
+ v->rtname, FullDataSize);
efi_status = gRT->SetVariable(v->rtname, v->guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
@@ -262,7 +431,15 @@ skip_vendor_cert:
v->rtname, efi_status);
}
}
-
+ if (v->data && v->data_size) {
+ FreePool(v->data);
+ v->data = NULL;
+ v->data_size = 0;
+ }
+ if (FullData && FullDataSize) {
+ FreePool(FullData);
+ }
+ dprint(L"returning %r\n", efi_status);
return efi_status;
}
@@ -274,6 +451,8 @@ static EFI_STATUS nonnull(1)
maybe_mirror_one_mok_variable(struct mok_state_variable *v, EFI_STATUS ret)
{
EFI_STATUS efi_status;
+ BOOLEAN present = FALSE;
+
if (v->rtname) {
if (v->flags & MOK_MIRROR_DELETE_FIRST)
LibDeleteVariable(v->rtname, v->guid);
@@ -286,6 +465,43 @@ maybe_mirror_one_mok_variable(struct mok_state_variable *v, EFI_STATUS ret)
efi_status);
}
}
+
+ present = (v->data && v->data_size) ? TRUE : FALSE;
+ if (!present)
+ return ret;
+
+ if (v->data_size == sizeof(UINT8) && v->state) {
+ *v->state = v->data[0];
+ }
+
+ if (v->flags & MOK_VARIABLE_MEASURE) {
+ /*
+ * Measure this into PCR 7 in the Microsoft format
+ */
+ efi_status = tpm_measure_variable(v->name, *v->guid,
+ v->data_size,
+ v->data);
+ if (EFI_ERROR(efi_status)) {
+ if (ret != EFI_SECURITY_VIOLATION)
+ ret = efi_status;
+ }
+ }
+
+ if (v->flags & MOK_VARIABLE_LOG) {
+ /*
+ * Log this variable into whichever PCR the table
+ * says.
+ */
+ EFI_PHYSICAL_ADDRESS datap =
+ (EFI_PHYSICAL_ADDRESS)(UINTN)v->data,
+ efi_status = tpm_log_event(datap, v->data_size,
+ v->pcr, (CHAR8 *)v->name8);
+ if (EFI_ERROR(efi_status)) {
+ if (ret != EFI_SECURITY_VIOLATION)
+ ret = efi_status;
+ }
+ }
+
return ret;
}
@@ -311,26 +527,20 @@ EFI_STATUS import_mok_state(EFI_HANDLE image_handle)
user_insecure_mode = 0;
ignore_db = 0;
+ dprint(L"importing mok state\n");
for (i = 0; mok_state_variables[i].name != NULL; i++) {
struct mok_state_variable *v = &mok_state_variables[i];
UINT32 attrs = 0;
- BOOLEAN delete = FALSE, present, addend;
-
- addend = check_addend(v);
+ BOOLEAN delete = FALSE;
efi_status = get_variable_attr(v->name,
&v->data, &v->data_size,
*v->guid, &attrs);
+ dprint(L"maybe mirroring %s\n", v->name);
if (efi_status == EFI_NOT_FOUND) {
- if (addend)
- ret = maybe_mirror_one_mok_variable(v, ret);
- /*
- * after possibly adding, we can continue, no
- * further checks to be done.
- */
- continue;
- }
- if (EFI_ERROR(efi_status)) {
+ v->data = NULL;
+ v->data_size = 0;
+ } else if (EFI_ERROR(efi_status)) {
perror(L"Could not verify %s: %r\n", v->name,
efi_status);
/*
@@ -339,22 +549,22 @@ EFI_STATUS import_mok_state(EFI_HANDLE image_handle)
*/
if (ret != EFI_SECURITY_VIOLATION)
ret = efi_status;
- continue;
- }
-
- if (!(attrs & v->yes_attr)) {
- perror(L"Variable %s is missing attributes:\n",
- v->name);
- perror(L" 0x%08x should have 0x%08x set.\n",
- attrs, v->yes_attr);
- delete = TRUE;
- }
- if (attrs & v->no_attr) {
- perror(L"Variable %s has incorrect attribute:\n",
- v->name);
- perror(L" 0x%08x should not have 0x%08x set.\n",
- attrs, v->no_attr);
delete = TRUE;
+ } else {
+ if (!(attrs & v->yes_attr)) {
+ perror(L"Variable %s is missing attributes:\n",
+ v->name);
+ perror(L" 0x%08x should have 0x%08x set.\n",
+ attrs, v->yes_attr);
+ delete = TRUE;
+ }
+ if (attrs & v->no_attr) {
+ perror(L"Variable %s has incorrect attribute:\n",
+ v->name);
+ perror(L" 0x%08x should not have 0x%08x set.\n",
+ attrs, v->no_attr);
+ delete = TRUE;
+ }
}
if (delete == TRUE) {
perror(L"Deleting bad variable %s\n", v->name);
@@ -366,45 +576,9 @@ EFI_STATUS import_mok_state(EFI_HANDLE image_handle)
FreePool(v->data);
v->data = NULL;
v->data_size = 0;
- continue;
}
- if (v->data && v->data_size == sizeof(UINT8) && v->state) {
- *v->state = v->data[0];
- }
-
- present = (v->data && v->data_size) ? TRUE : FALSE;
-
- if (v->flags & MOK_VARIABLE_MEASURE && present) {
- /*
- * Measure this into PCR 7 in the Microsoft format
- */
- efi_status = tpm_measure_variable(v->name, *v->guid,
- v->data_size,
- v->data);
- if (EFI_ERROR(efi_status)) {
- if (ret != EFI_SECURITY_VIOLATION)
- ret = efi_status;
- }
- }
-
- if (v->flags & MOK_VARIABLE_LOG && present) {
- /*
- * Log this variable into whichever PCR the table
- * says.
- */
- EFI_PHYSICAL_ADDRESS datap =
- (EFI_PHYSICAL_ADDRESS)(UINTN)v->data,
- efi_status = tpm_log_event(datap, v->data_size,
- v->pcr, (CHAR8 *)v->name8);
- if (EFI_ERROR(efi_status)) {
- if (ret != EFI_SECURITY_VIOLATION)
- ret = efi_status;
- }
- }
-
- if (present)
- ret = maybe_mirror_one_mok_variable(v, ret);
+ ret = maybe_mirror_one_mok_variable(v, ret);
}
/*
@@ -412,14 +586,16 @@ EFI_STATUS import_mok_state(EFI_HANDLE image_handle)
* cause MokManager to demand a machine reboot, so this is safe to
* have after the entire loop.
*/
+ dprint(L"checking mok request\n");
efi_status = check_mok_request(image_handle);
+ dprint(L"mok returned %r\n", efi_status);
if (EFI_ERROR(efi_status)) {
if (ret != EFI_SECURITY_VIOLATION)
ret = efi_status;
return ret;
}
-
+ dprint(L"returning %r\n", ret);
return ret;
}
diff --git a/shim.c b/shim.c
index 888ee6e8d7b..ee62248ca4e 100644
--- a/shim.c
+++ b/shim.c
@@ -646,6 +646,31 @@ static EFI_STATUS check_whitelist (WIN_CERTIFICATE_EFI_PKCS *cert,
}
}
+#if defined(VENDOR_DB_FILE)
+ EFI_SIGNATURE_LIST *db = (EFI_SIGNATURE_LIST *)vendor_db;
+
+ if (check_db_hash_in_ram(db, vendor_db_size,
+ sha256hash, SHA256_DIGEST_SIZE,
+ EFI_CERT_SHA256_GUID, L"vendor_db",
+ EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) {
+ verification_method = VERIFIED_BY_HASH;
+ update_verification_method(VERIFIED_BY_HASH);
+ return EFI_SUCCESS;
+ } else {
+ LogError(L"check_db_hash(vendor_db, sha256hash) != DATA_FOUND\n");
+ }
+ if (cert &&
+ check_db_cert_in_ram(db, vendor_db_size,
+ cert, sha256hash, L"vendor_db",
+ EFI_SECURE_BOOT_DB_GUID) == DATA_FOUND) {
+ verification_method = VERIFIED_BY_CERT;
+ update_verification_method(VERIFIED_BY_CERT);
+ return EFI_SUCCESS;
+ } else {
+ LogError(L"check_db_cert(vendor_db, sha256hash) != DATA_FOUND\n");
+ }
+#endif
+
if (check_db_hash(L"MokList", SHIM_LOCK_GUID, sha256hash,
SHA256_DIGEST_SIZE, EFI_CERT_SHA256_GUID)
== DATA_FOUND) {
@@ -1076,6 +1101,7 @@ static EFI_STATUS verify_buffer (char *data, int datasize,
}
#endif /* defined(ENABLE_SHIM_CERT) */
+#if defined(VENDOR_CERT_FILE)
/*
* And finally, check against shim's built-in key
*/
@@ -1093,6 +1119,7 @@ static EFI_STATUS verify_buffer (char *data, int datasize,
} else {
LogError(L"AuthenticodeVerify(vendor_authorized) failed\n");
}
+#endif /* defined(VENDOR_CERT_FILE) */
}
LogError(L"Binary is not whitelisted\n");
diff --git a/include/console.h b/include/console.h
index 9f259c71b72..810bf13a1f1 100644
--- a/include/console.h
+++ b/include/console.h
@@ -78,12 +78,13 @@ struct _EFI_CONSOLE_CONTROL_PROTOCOL {
extern VOID console_fini(VOID);
extern VOID setup_verbosity(VOID);
extern UINT32 verbose;
-#define dprint(fmt, ...) ({ \
+#define dprint_(fmt, ...) ({ \
UINTN __dprint_ret = 0; \
if (verbose) \
__dprint_ret = console_print((fmt), ##__VA_ARGS__); \
__dprint_ret; \
})
+#define dprint(fmt, ...) dprint_(L"%a:%d:%a() " fmt, __FILE__, __LINE__, __func__, ##__VA_ARGS__)
extern EFI_STATUS print_crypto_errors(EFI_STATUS rc, char *file, const char *func, int line);
#define crypterr(rc) print_crypto_errors((rc), __FILE__, __func__, __LINE__)
diff --git a/include/variables.h b/include/variables.h
index 8566a1a4746..436adb46e16 100644
--- a/include/variables.h
+++ b/include/variables.h
@@ -57,7 +57,12 @@ EFI_STATUS
variable_enroll_hash(CHAR16 *var, EFI_GUID owner,
UINT8 hash[SHA256_DIGEST_SIZE]);
EFI_STATUS
-variable_create_esl(void *cert, int cert_len, EFI_GUID *type, EFI_GUID *owner,
- void **out, int *outlen);
+variable_create_esl(const uint8_t *cert, const size_t cert_len,
+ const EFI_GUID *type, const EFI_GUID *owner,
+ uint8_t **out, size_t *outlen);
+EFI_STATUS
+fill_esl(const uint8_t *data, const size_t data_len,
+ const EFI_GUID *type, const EFI_GUID *owner,
+ uint8_t *out, size_t *outlen);
#endif /* SHIM_VARIABLES_H */
diff --git a/shim.h b/shim.h
index 555498c6673..c1d7e7c7197 100644
--- a/shim.h
+++ b/shim.h
@@ -97,7 +97,11 @@
#define FALLBACK L"\\fb" EFI_ARCH L".efi"
#define MOK_MANAGER L"\\mm" EFI_ARCH L".efi"
-#if defined(VENDOR_CERT_FILE)
+#if defined(VENDOR_DB_FILE)
+# define vendor_authorized vendor_db
+# define vendor_authorized_size vendor_db_size
+# define vendor_authorized_category VENDOR_ADDEND_DB
+#elif defined(VENDOR_CERT_FILE)
# define vendor_authorized vendor_cert
# define vendor_authorized_size vendor_cert_size
# define vendor_authorized_category VENDOR_ADDEND_X509
@@ -116,6 +120,7 @@
#endif
#include "include/asm.h"
+#include "include/compiler.h"
#include "include/configtable.h"
#include "include/console.h"
#include "include/crypt_blowfish.h"
diff --git a/cert.S b/cert.S
index 520caaef3af..e636fcbbf2d 100644
--- a/cert.S
+++ b/cert.S
@@ -1,5 +1,12 @@
-#if defined(VENDOR_CERT_FILE)
+#if defined(VENDOR_DB_FILE) && defined(VENDOR_CERT_FILE)
+# error both VENDOR_DB_FILE and VENDOR_CERT_FILE have been configured
+#elif defined(VENDOR_DB_FILE)
+# define vendor_authorized vendor_db
+# define vendor_authorized_end vendor_db_end
+# define vendor_authorized_size vendor_db_size
+# define vendor_authorized_size_end vendor_db_size_end
+#elif defined(VENDOR_CERT_FILE)
# define vendor_authorized vendor_cert
# define vendor_authorized_end vendor_cert_end
# define vendor_authorized_size vendor_cert_size
@@ -28,7 +35,9 @@ cert_table:
.size vendor_authorized, .Lvendor_authorized_end - vendor_authorized
.section .vendor_cert, "a", %progbits
vendor_authorized:
-#if defined(VENDOR_CERT_FILE)
+#if defined(VENDOR_DB_FILE)
+.incbin VENDOR_DB_FILE
+#elif defined(VENDOR_CERT_FILE)
.incbin VENDOR_CERT_FILE
#endif
.Lvendor_authorized_end:
diff --git a/Make.defaults b/Make.defaults
index f0bfa9fd573..2e01646a35d 100644
--- a/Make.defaults
+++ b/Make.defaults
@@ -125,6 +125,9 @@ BOOTCSVNAME ?= BOOT$(ARCH_SUFFIX_UPPER).CSV
CFLAGS += "-DEFI_ARCH=L\"$(ARCH_SUFFIX)\"" "-DDEBUGDIR=L\"/usr/lib/debug/usr/share/shim/$(ARCH_SUFFIX)-$(VERSION)$(DASHRELEASE)/\""
+ifneq ($(origin VENDOR_DB_FILE), undefined)
+ CFLAGS += -DVENDOR_DB_FILE=\"$(VENDOR_DB_FILE)\"
+endif
ifneq ($(origin VENDOR_CERT_FILE), undefined)
CFLAGS += -DVENDOR_CERT_FILE=\"$(VENDOR_CERT_FILE)\"
endif
diff --git a/README.tpm b/README.tpm
index c060dbe22db..62308d5c71a 100644
--- a/README.tpm
+++ b/README.tpm
@@ -13,6 +13,7 @@ PCR7:
- MokListX - the Mok blacklist, logged as "MokListX"
- vendor_dbx - shim's built-in vendor blacklist, logged as "dbx"
- DB - the system whitelist, logged as "db"
+ - vendor_db - shim's built-in vendor whitelist, logged as "db"
- MokList the Mok whitelist, logged as "MokList"
- vendor_cert - shim's built-in vendor whitelist, logged as "Shim"
- shim_cert - shim's build-time generated whitelist, logged as "Shim"
--
2.26.2
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