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MokManager.c
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#include <efi.h>
#include <efilib.h>
#include <Library/BaseCryptLib.h>
#include <openssl/x509.h>
#include "shim.h"
#include "PeImage.h"
#include "PasswordCrypt.h"
#include "guid.h"
#include "console.h"
#include "variables.h"
#include "simple_file.h"
#include "efiauthenticated.h"
#define PASSWORD_MAX 256
#define PASSWORD_MIN 1
#define SB_PASSWORD_LEN 16
#define NAME_LINE_MAX 70
#ifndef SHIM_VENDOR
#define SHIM_VENDOR L"Shim"
#endif
#define EFI_VARIABLE_APPEND_WRITE 0x00000040
EFI_GUID SHIM_LOCK_GUID = { 0x605dab50, 0xe046, 0x4300, {0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23} };
#define CERT_STRING L"Select an X509 certificate to enroll:\n\n"
#define HASH_STRING L"Select a file to trust:\n\n"
struct menu_item {
CHAR16 *text;
INTN (* callback)(void *data, void *data2, void *data3);
void *data;
void *data2;
void *data3;
UINTN colour;
};
typedef struct {
UINT32 MokSize;
UINT8 *Mok;
EFI_GUID Type;
} __attribute__ ((packed)) MokListNode;
typedef struct {
UINT32 MokSBState;
UINT32 PWLen;
CHAR16 Password[SB_PASSWORD_LEN];
} __attribute__ ((packed)) MokSBvar;
typedef struct {
UINT32 MokDBState;
UINT32 PWLen;
CHAR16 Password[SB_PASSWORD_LEN];
} __attribute__ ((packed)) MokDBvar;
static EFI_STATUS get_sha1sum (void *Data, int DataSize, UINT8 *hash)
{
EFI_STATUS status;
unsigned int ctxsize;
void *ctx = NULL;
ctxsize = Sha1GetContextSize();
ctx = AllocatePool(ctxsize);
if (!ctx) {
console_notify(L"Unable to allocate memory for hash context");
return EFI_OUT_OF_RESOURCES;
}
if (!Sha1Init(ctx)) {
console_notify(L"Unable to initialise hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
if (!(Sha1Update(ctx, Data, DataSize))) {
console_notify(L"Unable to generate hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
if (!(Sha1Final(ctx, hash))) {
console_notify(L"Unable to finalise hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
status = EFI_SUCCESS;
done:
return status;
}
static UINT32 count_keys(void *Data, UINTN DataSize)
{
EFI_SIGNATURE_LIST *CertList = Data;
EFI_GUID CertType = X509_GUID;
EFI_GUID HashType = EFI_CERT_SHA256_GUID;
UINTN dbsize = DataSize;
UINT32 MokNum = 0;
void *end = Data + DataSize;
while ((dbsize > 0) && (dbsize >= CertList->SignatureListSize)) {
/* Use ptr arithmetics to ensure bounded access. Do not allow 0
* SignatureListSize that will cause endless loop.
*/
if ((void *)(CertList + 1) > end || CertList->SignatureListSize == 0) {
console_notify(L"Invalid MOK detected! Ignoring MOK List.");
return 0;
}
if ((CompareGuid (&CertList->SignatureType, &CertType) != 0) &&
(CompareGuid (&CertList->SignatureType, &HashType) != 0)) {
console_notify(L"Doesn't look like a key or hash");
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList +
CertList->SignatureListSize);
continue;
}
if ((CompareGuid (&CertList->SignatureType, &CertType) != 0) &&
(CertList->SignatureSize != 48)) {
console_notify(L"Doesn't look like a valid hash");
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList +
CertList->SignatureListSize);
continue;
}
MokNum++;
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList +
CertList->SignatureListSize);
}
return MokNum;
}
static MokListNode *build_mok_list(UINT32 num, void *Data, UINTN DataSize) {
MokListNode *list;
EFI_SIGNATURE_LIST *CertList = Data;
EFI_SIGNATURE_DATA *Cert;
EFI_GUID CertType = X509_GUID;
EFI_GUID HashType = EFI_CERT_SHA256_GUID;
UINTN dbsize = DataSize;
UINTN count = 0;
void *end = Data + DataSize;
list = AllocatePool(sizeof(MokListNode) * num);
if (!list) {
console_notify(L"Unable to allocate MOK list");
return NULL;
}
while ((dbsize > 0) && (dbsize >= CertList->SignatureListSize)) {
/* CertList out of bounds? */
if ((void *)(CertList + 1) > end || CertList->SignatureListSize == 0) {
FreePool(list);
return NULL;
}
if ((CompareGuid (&CertList->SignatureType, &CertType) != 0) &&
(CompareGuid (&CertList->SignatureType, &HashType) != 0)) {
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *)((UINT8 *) CertList +
CertList->SignatureListSize);
continue;
}
if ((CompareGuid (&CertList->SignatureType, &HashType) == 0) &&
(CertList->SignatureSize != 48)) {
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *)((UINT8 *) CertList +
CertList->SignatureListSize);
continue;
}
Cert = (EFI_SIGNATURE_DATA *) (((UINT8 *) CertList) +
sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize);
/* Cert out of bounds? */
if ((void *)(Cert + 1) > end || CertList->SignatureSize <= sizeof(EFI_GUID)) {
FreePool(list);
return NULL;
}
list[count].MokSize = CertList->SignatureSize - sizeof(EFI_GUID);
list[count].Mok = (void *)Cert->SignatureData;
list[count].Type = CertList->SignatureType;
/* MOK out of bounds? */
if (list[count].MokSize > (unsigned long)end -
(unsigned long)list[count].Mok) {
FreePool(list);
return NULL;
}
count++;
dbsize -= CertList->SignatureListSize;
CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList +
CertList->SignatureListSize);
}
return list;
}
typedef struct {
int nid;
CHAR16 *name;
} NidName;
static NidName nidname[] = {
{NID_commonName, L"CN"},
{NID_organizationName, L"O"},
{NID_countryName, L"C"},
{NID_stateOrProvinceName, L"ST"},
{NID_localityName, L"L"},
{-1, NULL}
};
static CHAR16* get_x509_name (X509_NAME *X509Name)
{
CHAR16 name[NAME_LINE_MAX+1];
CHAR16 part[NAME_LINE_MAX+1];
char str[NAME_LINE_MAX];
int i, len, rest, first;
name[0] = '\0';
rest = NAME_LINE_MAX;
first = 1;
for (i = 0; nidname[i].name != NULL; i++) {
int add;
len = X509_NAME_get_text_by_NID (X509Name, nidname[i].nid,
str, NAME_LINE_MAX);
if (len <= 0)
continue;
if (first)
add = len + (int)StrLen(nidname[i].name) + 1;
else
add = len + (int)StrLen(nidname[i].name) + 3;
if (add > rest)
continue;
if (first) {
SPrint(part, NAME_LINE_MAX * sizeof(CHAR16), L"%s=%a",
nidname[i].name, str);
} else {
SPrint(part, NAME_LINE_MAX * sizeof(CHAR16), L", %s=%a",
nidname[i].name, str);
}
StrCat(name, part);
rest -= add;
first = 0;
}
if (rest >= 0 && rest < NAME_LINE_MAX)
return PoolPrint(L"%s", name);
return NULL;
}
static CHAR16* get_x509_time (ASN1_TIME *time)
{
BIO *bio = BIO_new (BIO_s_mem());
char str[30];
int len;
ASN1_TIME_print (bio, time);
len = BIO_read(bio, str, 29);
if (len < 0)
len = 0;
str[len] = '\0';
BIO_free (bio);
return PoolPrint(L"%a", str);
}
static void show_x509_info (X509 *X509Cert, UINT8 *hash)
{
ASN1_INTEGER *serial;
BIGNUM *bnser;
unsigned char hexbuf[30];
X509_NAME *X509Name;
ASN1_TIME *time;
CHAR16 *issuer = NULL;
CHAR16 *subject = NULL;
CHAR16 *from = NULL;
CHAR16 *until = NULL;
POOL_PRINT hash_string1;
POOL_PRINT hash_string2;
POOL_PRINT serial_string;
int fields = 0;
CHAR16 **text;
int i = 0;
ZeroMem(&hash_string1, sizeof(hash_string1));
ZeroMem(&hash_string2, sizeof(hash_string2));
ZeroMem(&serial_string, sizeof(serial_string));
serial = X509_get_serialNumber(X509Cert);
if (serial) {
int i, n;
bnser = ASN1_INTEGER_to_BN(serial, NULL);
n = BN_bn2bin(bnser, hexbuf);
for (i = 0; i < n; i++) {
CatPrint(&serial_string, L"%02x:", hexbuf[i]);
}
}
if (serial_string.str)
fields++;
X509Name = X509_get_issuer_name(X509Cert);
if (X509Name) {
issuer = get_x509_name(X509Name);
if (issuer)
fields++;
}
X509Name = X509_get_subject_name(X509Cert);
if (X509Name) {
subject = get_x509_name(X509Name);
if (subject)
fields++;
}
time = X509_get_notBefore(X509Cert);
if (time) {
from = get_x509_time(time);
if (from)
fields++;
}
time = X509_get_notAfter(X509Cert);
if (time) {
until = get_x509_time(time);
if (until)
fields++;
}
for (i=0; i<10; i++)
CatPrint(&hash_string1, L"%02x ", hash[i]);
for (i=10; i<20; i++)
CatPrint(&hash_string2, L"%02x ", hash[i]);
if (hash_string1.str)
fields++;
if (hash_string2.str)
fields++;
if (!fields)
return;
i = 0;
text = AllocateZeroPool(sizeof(CHAR16 *) * (fields*3 + 1));
if (serial_string.str) {
text[i++] = StrDuplicate(L"[Serial Number]");
text[i++] = serial_string.str;
text[i++] = StrDuplicate(L"");
}
if (issuer) {
text[i++] = StrDuplicate(L"[Issuer]");
text[i++] = issuer;
text[i++] = StrDuplicate(L"");
}
if (subject) {
text[i++] = StrDuplicate(L"[Subject]");
text[i++] = subject;
text[i++] = StrDuplicate(L"");
}
if (from) {
text[i++] = StrDuplicate(L"[Valid Not Before]");
text[i++] = from;
text[i++] = StrDuplicate(L"");
}
if (until) {
text[i++] = StrDuplicate(L"[Valid Not After]");
text[i++] = until;
text[i++] = StrDuplicate(L"");
}
if (hash_string1.str) {
text[i++] = StrDuplicate(L"[Fingerprint]");
text[i++] = hash_string1.str;
}
if (hash_string2.str) {
text[i++] = hash_string2.str;
text[i++] = StrDuplicate(L"");
}
text[i] = NULL;
console_print_box(text, -1);
for (i=0; text[i] != NULL; i++)
FreePool(text[i]);
FreePool(text);
}
static void show_efi_hash (UINT8 *hash)
{
CHAR16 *text[5];
POOL_PRINT hash_string1;
POOL_PRINT hash_string2;
int i;
ZeroMem(&hash_string1, sizeof(hash_string1));
ZeroMem(&hash_string2, sizeof(hash_string2));
text[0] = L"SHA256 hash";
text[1] = L"";
for (i=0; i<16; i++)
CatPrint(&hash_string1, L"%02x ", hash[i]);
for (i=16; i<32; i++)
CatPrint(&hash_string2, L"%02x ", hash[i]);
text[2] = hash_string1.str;
text[3] = hash_string2.str;
text[4] = NULL;
console_print_box(text, -1);
if (hash_string1.str)
FreePool(hash_string1.str);
if (hash_string2.str)
FreePool(hash_string2.str);
}
static void show_mok_info (void *Mok, UINTN MokSize)
{
EFI_STATUS efi_status;
UINT8 hash[SHA1_DIGEST_SIZE];
X509 *X509Cert;
if (!Mok || MokSize == 0)
return;
if (MokSize != SHA256_DIGEST_SIZE) {
efi_status = get_sha1sum(Mok, MokSize, hash);
if (efi_status != EFI_SUCCESS) {
console_notify(L"Failed to compute MOK fingerprint");
return;
}
if (X509ConstructCertificate(Mok, MokSize,
(UINT8 **) &X509Cert) && X509Cert != NULL) {
show_x509_info(X509Cert, hash);
X509_free(X509Cert);
} else {
console_notify(L"Not a valid X509 certificate");
return;
}
} else {
show_efi_hash(Mok);
}
}
static EFI_STATUS list_keys (void *KeyList, UINTN KeyListSize, CHAR16 *title)
{
INTN MokNum = 0;
MokListNode *keys = NULL;
INTN key_num = 0;
CHAR16 **menu_strings;
int i;
if (KeyListSize < (sizeof(EFI_SIGNATURE_LIST) +
sizeof(EFI_SIGNATURE_DATA))) {
console_notify(L"No MOK keys found");
return 0;
}
MokNum = count_keys(KeyList, KeyListSize);
if (MokNum == 0)
return 0;
keys = build_mok_list(MokNum, KeyList, KeyListSize);
if (!keys) {
console_notify(L"Failed to construct key list");
return 0;
}
menu_strings = AllocateZeroPool(sizeof(CHAR16 *) * (MokNum + 2));
if (!menu_strings)
return EFI_OUT_OF_RESOURCES;
for (i=0; i<MokNum; i++) {
menu_strings[i] = PoolPrint(L"View key %d", i);
}
menu_strings[i] = StrDuplicate(L"Continue");
menu_strings[i+1] = NULL;
while (key_num < MokNum) {
key_num = console_select((CHAR16 *[]){ title, NULL },
menu_strings, 0);
if (key_num < 0)
break;
else if (key_num < MokNum)
show_mok_info(keys[key_num].Mok, keys[key_num].MokSize);
}
for (i=0; menu_strings[i] != NULL; i++)
FreePool(menu_strings[i]);
FreePool(menu_strings);
FreePool(keys);
return EFI_SUCCESS;
}
static EFI_STATUS get_line (UINT32 *length, CHAR16 *line, UINT32 line_max, UINT8 show)
{
EFI_INPUT_KEY key;
EFI_STATUS status;
unsigned int count = 0;
do {
status = console_get_keystroke(&key);
if (EFI_ERROR (status)) {
console_error(L"Failed to read the keystroke", status);
*length = 0;
return status;
}
if ((count >= line_max &&
key.UnicodeChar != CHAR_BACKSPACE) ||
key.UnicodeChar == CHAR_NULL ||
key.UnicodeChar == CHAR_TAB ||
key.UnicodeChar == CHAR_LINEFEED ||
key.UnicodeChar == CHAR_CARRIAGE_RETURN) {
continue;
}
if (count == 0 && key.UnicodeChar == CHAR_BACKSPACE) {
continue;
} else if (key.UnicodeChar == CHAR_BACKSPACE) {
if (show) {
Print(L"\b");
}
line[--count] = '\0';
continue;
}
if (show) {
Print(L"%c", key.UnicodeChar);
}
line[count++] = key.UnicodeChar;
} while (key.UnicodeChar != CHAR_CARRIAGE_RETURN);
Print(L"\n");
*length = count;
return EFI_SUCCESS;
}
static EFI_STATUS compute_pw_hash (void *Data, UINTN DataSize, UINT8 *password,
UINT32 pw_length, UINT8 *hash)
{
EFI_STATUS status;
unsigned int ctxsize;
void *ctx = NULL;
ctxsize = Sha256GetContextSize();
ctx = AllocatePool(ctxsize);
if (!ctx) {
console_notify(L"Unable to allocate memory for hash context");
return EFI_OUT_OF_RESOURCES;
}
if (!Sha256Init(ctx)) {
console_notify(L"Unable to initialise hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
if (Data && DataSize) {
if (!(Sha256Update(ctx, Data, DataSize))) {
console_notify(L"Unable to generate hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
}
if (!(Sha256Update(ctx, password, pw_length))) {
console_notify(L"Unable to generate hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
if (!(Sha256Final(ctx, hash))) {
console_notify(L"Unable to finalise hash");
status = EFI_OUT_OF_RESOURCES;
goto done;
}
status = EFI_SUCCESS;
done:
return status;
}
static void console_save_and_set_mode (SIMPLE_TEXT_OUTPUT_MODE *SavedMode)
{
if (!SavedMode) {
Print(L"Invalid parameter: SavedMode\n");
return;
}
CopyMem(SavedMode, ST->ConOut->Mode, sizeof(SIMPLE_TEXT_OUTPUT_MODE));
uefi_call_wrapper(ST->ConOut->EnableCursor, 2, ST->ConOut, FALSE);
uefi_call_wrapper(ST->ConOut->SetAttribute, 2, ST->ConOut,
EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE);
}
static void console_restore_mode (SIMPLE_TEXT_OUTPUT_MODE *SavedMode)
{
uefi_call_wrapper(ST->ConOut->EnableCursor, 2, ST->ConOut,
SavedMode->CursorVisible);
uefi_call_wrapper(ST->ConOut->SetCursorPosition, 3, ST->ConOut,
SavedMode->CursorColumn, SavedMode->CursorRow);
uefi_call_wrapper(ST->ConOut->SetAttribute, 2, ST->ConOut,
SavedMode->Attribute);
}
static UINT32 get_password (CHAR16 *prompt, CHAR16 *password, UINT32 max)
{
SIMPLE_TEXT_OUTPUT_MODE SavedMode;
CHAR16 *str;
CHAR16 *message[2];
UINTN length;
UINT32 pw_length;
if (!prompt)
prompt = L"Password:";
console_save_and_set_mode(&SavedMode);
str = PoolPrint(L"%s ", prompt);
if (!str) {
console_errorbox(L"Failed to allocate prompt");
return 0;
}
message[0] = str;
message[1] = NULL;
length = StrLen(message[0]);
console_print_box_at(message, -1, -length-4, -5, length+4, 3, 0, 1);
get_line(&pw_length, password, max, 0);
console_restore_mode(&SavedMode);
FreePool(str);
return pw_length;
}
static EFI_STATUS match_password (PASSWORD_CRYPT *pw_crypt,
void *Data, UINTN DataSize,
UINT8 *auth, CHAR16 *prompt)
{
EFI_STATUS status;
UINT8 hash[128];
UINT8 *auth_hash;
UINT32 auth_size;
CHAR16 password[PASSWORD_MAX];
UINT32 pw_length;
UINT8 fail_count = 0;
unsigned int i;
if (pw_crypt) {
auth_hash = pw_crypt->hash;
auth_size = get_hash_size (pw_crypt->method);
if (auth_size == 0)
return EFI_INVALID_PARAMETER;
} else if (auth) {
auth_hash = auth;
auth_size = SHA256_DIGEST_SIZE;
} else {
return EFI_INVALID_PARAMETER;
}
while (fail_count < 3) {
pw_length = get_password(prompt, password, PASSWORD_MAX);
if (pw_length < PASSWORD_MIN || pw_length > PASSWORD_MAX) {
console_errorbox(L"Invalid password length");
fail_count++;
continue;
}
/*
* Compute password hash
*/
if (pw_crypt) {
char pw_ascii[PASSWORD_MAX + 1];
for (i = 0; i < pw_length; i++)
pw_ascii[i] = (char)password[i];
pw_ascii[pw_length] = '\0';
status = password_crypt(pw_ascii, pw_length, pw_crypt, hash);
} else {
/*
* For backward compatibility
*/
status = compute_pw_hash(Data, DataSize, (UINT8 *)password,
pw_length * sizeof(CHAR16), hash);
}
if (status != EFI_SUCCESS) {
console_errorbox(L"Unable to generate password hash");
fail_count++;
continue;
}
if (CompareMem(auth_hash, hash, auth_size) != 0) {
console_errorbox(L"Password doesn't match");
fail_count++;
continue;
}
break;
}
if (fail_count >= 3)
return EFI_ACCESS_DENIED;
return EFI_SUCCESS;
}
static EFI_STATUS store_keys (void *MokNew, UINTN MokNewSize, int authenticate)
{
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;
UINT8 auth[PASSWORD_CRYPT_SIZE];
UINTN auth_size = PASSWORD_CRYPT_SIZE;
UINT32 attributes;
if (authenticate) {
efi_status = uefi_call_wrapper(RT->GetVariable, 5, L"MokAuth",
&shim_lock_guid,
&attributes, &auth_size, auth);
if (efi_status != EFI_SUCCESS ||
(auth_size != SHA256_DIGEST_SIZE &&
auth_size != PASSWORD_CRYPT_SIZE)) {
console_error(L"Failed to get MokAuth", efi_status);
return efi_status;
}
if (auth_size == PASSWORD_CRYPT_SIZE) {
efi_status = match_password((PASSWORD_CRYPT *)auth,
NULL, 0, NULL, NULL);
} else {
efi_status = match_password(NULL, MokNew, MokNewSize,
auth, NULL);
}
if (efi_status != EFI_SUCCESS)
return EFI_ACCESS_DENIED;
}
if (!MokNewSize) {
/* Delete MOK */
efi_status = uefi_call_wrapper(RT->SetVariable, 5, L"MokList",
&shim_lock_guid,
EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS,
0, NULL);
} else {
/* Write new MOK */
efi_status = uefi_call_wrapper(RT->SetVariable, 5, L"MokList",
&shim_lock_guid,
EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_APPEND_WRITE,
MokNewSize, MokNew);
}
if (efi_status != EFI_SUCCESS) {
console_error(L"Failed to set variable", efi_status);
return efi_status;
}
return EFI_SUCCESS;
}
static UINTN mok_enrollment_prompt (void *MokNew, UINTN MokNewSize, int auth) {
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;
if (list_keys(MokNew, MokNewSize, L"[Enroll MOK]") != EFI_SUCCESS)
return 0;
if (console_yes_no((CHAR16 *[]){L"Enroll the key(s)?", NULL}) == 0)
return 0;
efi_status = store_keys(MokNew, MokNewSize, auth);
if (efi_status != EFI_SUCCESS) {
console_notify(L"Failed to enroll keys\n");
return -1;
}
if (auth) {
LibDeleteVariable(L"MokNew", &shim_lock_guid);
LibDeleteVariable(L"MokAuth", &shim_lock_guid);
console_notify(L"The system must now be rebooted");
uefi_call_wrapper(RT->ResetSystem, 4, EfiResetWarm,
EFI_SUCCESS, 0, NULL);
console_notify(L"Failed to reboot");
return -1;
}
return 0;
}
static INTN mok_reset_prompt ()
{
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;
uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut);
if (console_yes_no((CHAR16 *[]){L"Erase all stored keys?", NULL }) == 0)
return 0;
efi_status = store_keys(NULL, 0, TRUE);
if (efi_status != EFI_SUCCESS) {
console_notify(L"Failed to erase keys\n");
return -1;
}
LibDeleteVariable(L"MokNew", &shim_lock_guid);
LibDeleteVariable(L"MokAuth", &shim_lock_guid);
console_notify(L"The system must now be rebooted");
uefi_call_wrapper(RT->ResetSystem, 4, EfiResetWarm,
EFI_SUCCESS, 0, NULL);
console_notify(L"Failed to reboot\n");
return -1;
}
static EFI_STATUS write_back_mok_list (MokListNode *list, INTN key_num)
{
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;
EFI_SIGNATURE_LIST *CertList;
EFI_SIGNATURE_DATA *CertData;
void *Data = NULL, *ptr;
INTN DataSize = 0;
int i;
for (i = 0; i < key_num; i++) {
if (list[i].Mok == NULL)
continue;
DataSize += sizeof(EFI_SIGNATURE_LIST) + sizeof(EFI_GUID);
DataSize += list[i].MokSize;
}
Data = AllocatePool(DataSize);
if (Data == NULL && DataSize != 0)
return EFI_OUT_OF_RESOURCES;
ptr = Data;
for (i = 0; i < key_num; i++) {
if (list[i].Mok == NULL)
continue;
CertList = (EFI_SIGNATURE_LIST *)ptr;
CertData = (EFI_SIGNATURE_DATA *)(((uint8_t *)ptr) +
sizeof(EFI_SIGNATURE_LIST));
CertList->SignatureType = list[i].Type;
CertList->SignatureListSize = list[i].MokSize +
sizeof(EFI_SIGNATURE_LIST) +
sizeof(EFI_SIGNATURE_DATA) - 1;
CertList->SignatureHeaderSize = 0;
CertList->SignatureSize = list[i].MokSize + sizeof(EFI_GUID);
CertData->SignatureOwner = shim_lock_guid;
CopyMem(CertData->SignatureData, list[i].Mok, list[i].MokSize);
ptr = (uint8_t *)ptr + sizeof(EFI_SIGNATURE_LIST) +
sizeof(EFI_GUID) + list[i].MokSize;
}
efi_status = uefi_call_wrapper(RT->SetVariable, 5, L"MokList",
&shim_lock_guid,
EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS,
DataSize, Data);
if (Data)
FreePool(Data);
if (efi_status != EFI_SUCCESS) {
console_error(L"Failed to set variable", efi_status);
return efi_status;
}
return EFI_SUCCESS;
}
static EFI_STATUS delete_keys (void *MokDel, UINTN MokDelSize)
{
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;
UINT8 auth[PASSWORD_CRYPT_SIZE];
UINTN auth_size = PASSWORD_CRYPT_SIZE;
UINT32 attributes;
UINT8 *MokListData = NULL;
UINTN MokListDataSize = 0;
MokListNode *mok, *del_key;
INTN mok_num, del_num;
int i, j;
efi_status = uefi_call_wrapper(RT->GetVariable, 5, L"MokDelAuth",
&shim_lock_guid,
&attributes, &auth_size, auth);
if (efi_status != EFI_SUCCESS ||
(auth_size != SHA256_DIGEST_SIZE && auth_size != PASSWORD_CRYPT_SIZE)) {
console_error(L"Failed to get MokDelAuth", efi_status);
return efi_status;
}
if (auth_size == PASSWORD_CRYPT_SIZE) {
efi_status = match_password((PASSWORD_CRYPT *)auth, NULL, 0,
NULL, NULL);
} else {
efi_status = match_password(NULL, MokDel, MokDelSize, auth, NULL);
}
if (efi_status != EFI_SUCCESS)
return EFI_ACCESS_DENIED;
efi_status = get_variable_attr (L"MokList", &MokListData, &MokListDataSize,
shim_lock_guid, &attributes);
if (attributes & EFI_VARIABLE_RUNTIME_ACCESS) {
console_alertbox((CHAR16 *[]){L"MokList is compromised!",
L"Erase all keys in MokList!",
NULL});
if (LibDeleteVariable(L"MokList", &shim_lock_guid) != EFI_SUCCESS) {
console_notify(L"Failed to erase MokList");
}
return EFI_ACCESS_DENIED;
}
/* Nothing to do */
if (!MokListData || MokListDataSize == 0)
return EFI_SUCCESS;
/* Construct lists */
mok_num = count_keys(MokListData, MokListDataSize);
mok = build_mok_list(mok_num, MokListData, MokListDataSize);
del_num = count_keys(MokDel, MokDelSize);
del_key = build_mok_list(del_num, MokDel, MokDelSize);
/* Search and destroy */
for (i = 0; i < del_num; i++) {
UINT32 key_size = del_key[i].MokSize;
void *key = del_key[i].Mok;
for (j = 0; j < mok_num; j++) {
if (mok[j].MokSize == key_size &&
CompareMem(key, mok[j].Mok, key_size) == 0) {
/* Remove the key */
mok[j].Mok = NULL;
mok[j].MokSize = 0;
}
}
}
efi_status = write_back_mok_list(mok, mok_num);
if (MokListData)
FreePool(MokListData);
if (mok)
FreePool(mok);
if (del_key)
FreePool(del_key);
return efi_status;
}
static INTN mok_deletion_prompt (void *MokDel, UINTN MokDelSize)
{
EFI_GUID shim_lock_guid = SHIM_LOCK_GUID;
EFI_STATUS efi_status;