Index: stand/common/bootstrap.h =================================================================== --- stand/common/bootstrap.h +++ stand/common/bootstrap.h @@ -33,6 +33,10 @@ #include #include +#ifdef SECURE_BOOT +#include +#endif + /* Commands and return values; nonzero return sets command_errmsg != NULL */ typedef int (bootblk_cmd_t)(int argc, char *argv[]); #define COMMAND_ERRBUFSZ (256) @@ -332,6 +336,19 @@ /* For kexec-type loaders, get ksegment structure */ void (*arch_kexec_kseg_get)(int *nseg, void **kseg); +#ifdef SECURE_BOOT + /* + * Check if we should verify anything. + * 0 - Secure boot disabled, + * 1 - enabled + */ + int (*secure_boot_enabled)(void); + /* Return an array of x509 CAs */ + br_x509_certificate* (*secure_boot_get_CAs)(size_t *count); + br_x509_certificate* (*secure_boot_get_forbidden_CAs)(size_t *count); + /* Check if the DER encoded TBS part of X509 certificate is forbidden */ + int (*secure_boot_cert_forbidden)(const char*, size_t); +#endif }; extern struct arch_switch archsw; Index: stand/common/module.c =================================================================== --- stand/common/module.c +++ stand/common/module.c @@ -41,6 +41,10 @@ #include "bootstrap.h" +#ifdef SECURE_BOOT +#include "verify.h" +#endif + #define MDIR_REMOVED 0x0001 #define MDIR_NOHINTS 0x0002 @@ -428,6 +432,11 @@ return(NULL); } +#ifdef SECURE_BOOT + if (verify(name) != 0) + return (NULL); +#endif + if ((fd = open(name, O_RDONLY)) < 0) { snprintf(command_errbuf, sizeof(command_errbuf), "can't open '%s': %s", name, strerror(errno)); @@ -552,6 +561,12 @@ last_file = last_file->f_next) ; +#ifdef SECURE_BOOT + err = verify(filename); + if (err != 0) + return (err); +#endif + do { err = file_load(filename, loadaddr, &fp); if (err) Index: stand/common/verify.h =================================================================== --- /dev/null +++ stand/common/verify.h @@ -0,0 +1,6 @@ +#ifndef VERIFY_H +#define VERIFY_H + +int verify(const char*); + +#endif /* VERIFY_H */ Index: stand/common/verify.c =================================================================== --- /dev/null +++ stand/common/verify.c @@ -0,0 +1,227 @@ +/*- + * Copyright (c) 2019 Stormshield. + * Copyright (c) 2019 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +__FBSDID("$FreeBSD$"); + +#include +#include + +#include "bootstrap.h" +#include "verify.h" + +int +verify(const char *path) +{ + struct signature_info header; + unsigned char digest[br_sha256_SIZE]; + unsigned char decrypted_digest[br_sha256_SIZE]; + unsigned char *signature; + size_t tbs_size; + int result = 0; + ssize_t read_result; + int fd; + + size_t trusted_count; + br_x509_certificate cert; + unsigned char *tbs_cert; + br_x509_certificate *trusted_certs; + br_x509_pkey *pkey; + br_rsa_pkcs1_vrfy vrfy_fp; + + signature = NULL; + cert.data = NULL; + + if (archsw.secure_boot_enabled == NULL) { + printf("archsw.secure_boot_enabled == NULL\n"); + return (EINVAL); + } + + result = archsw.secure_boot_enabled(); + + /* + * 0 - SecureBoot disabled, + * 1 - enabled, + * any other value - error + */ + if (result == 0) + return (0); + + if (result != 1) + return (EINVAL); + + if (archsw.secure_boot_get_CAs == NULL) { + printf("archsw.secure_boot_getCAs == NULL\n"); + return (EINVAL); + } + if (archsw.secure_boot_get_forbidden_CAs == NULL) { + printf("archsw.secure_boot_get_forbidden_CAs == NULL\n"); + return (EINVAL); + } + if (archsw.secure_boot_cert_forbidden == NULL) { + printf("archsw.secure_boot_cert_forbidden == NULL\n"); + return (EINVAL); + } + + /* + * XXX: Opening and closing a file causes a memory leak of 4kB + */ + fd = open(path, O_RDONLY); + + /* + * The structure with information about the signature + * is simply appended to the binary file. + */ + lseek(fd, sizeof(header), SEEK_END); + read_result = checked_read(fd, (char *)&header, sizeof(header)); + if (read_result != sizeof(header)) { + printf("Failed to read header\n"); + result = errno; + goto out; + } + + if (header.magic != MAGIC) { + printf("Bad signature magic\n"); + result = EINVAL; + goto out; + } + + /* + * Check if the sizes are sane. + */ + if (header.signature_size > 4096 || header.cert_size > 4096) { + result = EINVAL; + goto out; + } + + lseek(fd, header.kernel_size, SEEK_SET); + signature = malloc(header.signature_size); + cert.data = malloc(header.cert_size); + if (signature == NULL || cert.data == NULL) { + printf("Failed to allocate memory\n"); + result = ENOMEM; + goto out; + } + + cert.data_len = header.cert_size; + read_result = checked_read(fd, signature, header.signature_size); + if (read_result != header.signature_size) { + printf("Failed to read signature\n"); + result = errno; + goto out; + } + read_result = checked_read(fd, cert.data, header.cert_size); + if (read_result != header.cert_size) { + printf("Failed to read X509 certificate\n"); + result = errno; + goto out; + } + + /* + * Check if the certificate is blacklisted. + */ + tbs_cert = X509_to_tbs(cert.data, &tbs_size); + result = archsw.secure_boot_cert_forbidden(tbs_cert, tbs_size); + if (result != 0) { + printf("Certificate is forbidden\n"); + goto out; + } + + /* + * Check if CA that was used to sign the certificate + * is on the forbidden list. + */ + trusted_certs = archsw.secure_boot_get_forbidden_CAs(&trusted_count); + if (trusted_certs != NULL) { + pkey = verify_cert(&cert, trusted_certs, trusted_count); + free_certs(trusted_certs, trusted_count); + if (pkey != NULL) { + printf("Certificate is forbidden\n"); + result = EACCES; + goto out; + } + } + + /* + * Verify if we trust the embedded certificate. + */ + trusted_certs = archsw.secure_boot_get_CAs(&trusted_count); + if (trusted_certs == NULL) { + printf("Invalid CA count\n"); + result = EINVAL; + goto out; + } + pkey = verify_cert(&cert, trusted_certs, trusted_count); + free_certs(trusted_certs, trusted_count); + if (pkey == NULL) { + printf("Failed to verify certificate\n"); + result = EACCES; + goto out; + } + + /* + * Decode encrypted digest using public key + * of the embedded certificate. + */ + vrfy_fp = br_rsa_pkcs1_vrfy_get_default(); + result = vrfy_fp(signature, header.signature_size, + BR_HASH_OID_SHA256, br_sha256_SIZE, + &pkey->key.rsa, decrypted_digest); + free_pkey(pkey); + free(pkey); + if (result != 1) { + printf("Failed to decode signature\n"); + result = EINVAL; + goto out; + } + + /* + * Calculate digest, excluding the signature + * and compare it against what we have just decoded. + */ + lseek(fd, 0, SEEK_SET); + result = gen_digest(fd, header.kernel_size, digest); + if (result != 0) { + printf("Failed to hash the binary\n"); + goto out; + } + if (memcmp(digest, decrypted_digest, br_sha256_SIZE) != 0) { + printf("Decoded hash doesn't match\n"); + result = EACCES; + goto out; + } else + result = 0; + +out: + if (signature != NULL) + free(signature); + if (cert.data != NULL) + free(cert.data); + + close(fd); + return (result); +} Index: stand/defs.mk =================================================================== --- stand/defs.mk +++ stand/defs.mk @@ -174,6 +174,12 @@ .endif LOADER_INTERP?=${LOADER_DEFAULT_INTERP} +# Secure Boot +.if ${MK_SECUREBOOT} == "yes" +.include "${SRCTOP}/lib/libbearssl/Makefile.inc" +.include "${SRCTOP}/lib/libsecureboot/Makefile.inc" +.endif + # Make sure we use the machine link we're about to create CFLAGS+=-I. Index: stand/efi/include/Guid/GlobalVariable.h =================================================================== --- /dev/null +++ stand/efi/include/Guid/GlobalVariable.h @@ -0,0 +1,193 @@ +/* $FreeBSD$ */ +/** @file + GUID for EFI (NVRAM) Variables. + + Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
+ This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + + @par Revision Reference: + GUID defined in UEFI 2.1 +**/ + +#ifndef __GLOBAL_VARIABLE_GUID_H__ +#define __GLOBAL_VARIABLE_GUID_H__ + +#define EFI_GLOBAL_VARIABLE \ + { \ + 0x8BE4DF61, 0x93CA, 0x11d2, {0xAA, 0x0D, 0x00, 0xE0, 0x98, 0x03, 0x2B, 0x8C } \ + } + +extern EFI_GUID gEfiGlobalVariableGuid; + +// +// Follow UEFI 2.4 spec: +// To prevent name collisions with possible future globally defined variables, +// other internal firmware data variables that are not defined here must be +// saved with a unique VendorGuid other than EFI_GLOBAL_VARIABLE or +// any other GUID defined by the UEFI Specification. Implementations must +// only permit the creation of variables with a UEFI Specification-defined +// VendorGuid when these variables are documented in the UEFI Specification. +// +// Note: except the globally defined variables defined below, the spec also defines +// L"Boot####" - A boot load option. +// L"Driver####" - A driver load option. +// L"SysPrep####" - A System Prep application load option. +// L"Key####" - Describes hot key relationship with a Boot#### load option. +// The attribute for them is NV+BS+RT, #### is a printed hex value, and no 0x or h +// is included in the hex value. They can not be expressed as a #define like other globally +// defined variables, it is because we can not list the Boot0000, Boot0001, etc one by one. +// + +/// +/// The language codes that the firmware supports. This value is deprecated. +/// Its attribute is BS+RT. +/// +#define EFI_LANG_CODES_VARIABLE_NAME L"LangCodes" +/// +/// The language code that the system is configured for. This value is deprecated. +/// Its attribute is NV+BS+RT. +/// +#define EFI_LANG_VARIABLE_NAME L"Lang" +/// +/// The firmware's boot managers timeout, in seconds, before initiating the default boot selection. +/// Its attribute is NV+BS+RT. +/// +#define EFI_TIME_OUT_VARIABLE_NAME L"Timeout" +/// +/// The language codes that the firmware supports. +/// Its attribute is BS+RT. +/// +#define EFI_PLATFORM_LANG_CODES_VARIABLE_NAME L"PlatformLangCodes" +/// +/// The language code that the system is configured for. +/// Its attribute is NV+BS+RT. +/// +#define EFI_PLATFORM_LANG_VARIABLE_NAME L"PlatformLang" +/// +/// The device path of the default input/output/error output console. +/// Its attribute is NV+BS+RT. +/// +#define EFI_CON_IN_VARIABLE_NAME L"ConIn" +#define EFI_CON_OUT_VARIABLE_NAME L"ConOut" +#define EFI_ERR_OUT_VARIABLE_NAME L"ErrOut" +/// +/// The device path of all possible input/output/error output devices. +/// Its attribute is BS+RT. +/// +#define EFI_CON_IN_DEV_VARIABLE_NAME L"ConInDev" +#define EFI_CON_OUT_DEV_VARIABLE_NAME L"ConOutDev" +#define EFI_ERR_OUT_DEV_VARIABLE_NAME L"ErrOutDev" +/// +/// The ordered boot option load list. +/// Its attribute is NV+BS+RT. +/// +#define EFI_BOOT_ORDER_VARIABLE_NAME L"BootOrder" +/// +/// The boot option for the next boot only. +/// Its attribute is NV+BS+RT. +/// +#define EFI_BOOT_NEXT_VARIABLE_NAME L"BootNext" +/// +/// The boot option that was selected for the current boot. +/// Its attribute is BS+RT. +/// +#define EFI_BOOT_CURRENT_VARIABLE_NAME L"BootCurrent" +/// +/// The types of boot options supported by the boot manager. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_BOOT_OPTION_SUPPORT_VARIABLE_NAME L"BootOptionSupport" +/// +/// The ordered driver load option list. +/// Its attribute is NV+BS+RT. +/// +#define EFI_DRIVER_ORDER_VARIABLE_NAME L"DriverOrder" +/// +/// The ordered System Prep Application load option list. +/// Its attribute is NV+BS+RT. +/// +#define EFI_SYS_PREP_ORDER_VARIABLE_NAME L"SysPrepOrder" +/// +/// Identifies the level of hardware error record persistence +/// support implemented by the platform. This variable is +/// only modified by firmware and is read-only to the OS. +/// Its attribute is NV+BS+RT. +/// +#define EFI_HW_ERR_REC_SUPPORT_VARIABLE_NAME L"HwErrRecSupport" +/// +/// Whether the system is operating in setup mode (1) or not (0). +/// All other values are reserved. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_SETUP_MODE_NAME L"SetupMode" +/// +/// The Key Exchange Key Signature Database. +/// Its attribute is NV+BS+RT+AT. +/// +#define EFI_KEY_EXCHANGE_KEY_NAME L"KEK" +/// +/// The public Platform Key. +/// Its attribute is NV+BS+RT+AT. +/// +#define EFI_PLATFORM_KEY_NAME L"PK" +/// +/// Array of GUIDs representing the type of signatures supported +/// by the platform firmware. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_SIGNATURE_SUPPORT_NAME L"SignatureSupport" +/// +/// Whether the platform firmware is operating in Secure boot mode (1) or not (0). +/// All other values are reserved. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_SECURE_BOOT_MODE_NAME L"SecureBoot" +/// +/// The OEM's default Key Exchange Key Signature Database. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_KEK_DEFAULT_VARIABLE_NAME L"KEKDefault" +/// +/// The OEM's default public Platform Key. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_PK_DEFAULT_VARIABLE_NAME L"PKDefault" +/// +/// The OEM's default secure boot signature store. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_DB_DEFAULT_VARIABLE_NAME L"dbDefault" +/// +/// The OEM's default secure boot blacklist signature store. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_DBX_DEFAULT_VARIABLE_NAME L"dbxDefault" +/// +/// The OEM's default secure boot timestamp signature store. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_DBT_DEFAULT_VARIABLE_NAME L"dbtDefault" +/// +/// Allows the firmware to indicate supported features and actions to the OS. +/// Its attribute is BS+RT. +/// +#define EFI_OS_INDICATIONS_SUPPORT_VARIABLE_NAME L"OsIndicationsSupported" +/// +/// Allows the OS to request the firmware to enable certain features and to take certain actions. +/// Its attribute is NV+BS+RT. +/// +#define EFI_OS_INDICATIONS_VARIABLE_NAME L"OsIndications" +/// +/// Whether the system is configured to use only vendor provided +/// keys or not. Should be treated as read-only. +/// Its attribute is BS+RT. +/// +#define EFI_VENDOR_KEYS_VARIABLE_NAME L"VendorKeys" + +#endif Index: stand/efi/include/Guid/ImageAuthentication.h =================================================================== --- /dev/null +++ stand/efi/include/Guid/ImageAuthentication.h @@ -0,0 +1,353 @@ +/* $FreeBSD$ */ +/** @file + Image signature database are defined for the signed image validation. + + Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.
+ This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + + @par Revision Reference: + GUIDs defined in UEFI 2.5 spec. +**/ + +#ifndef __IMAGE_AUTHTICATION_H__ +#define __IMAGE_AUTHTICATION_H__ + +#include +#include + +#define EFI_IMAGE_SECURITY_DATABASE_GUID \ + { \ + 0xd719b2cb, 0x3d3a, 0x4596, { 0xa3, 0xbc, 0xda, 0xd0, 0xe, 0x67, 0x65, 0x6f } \ + } + +/// +/// Varialbe name with guid EFI_IMAGE_SECURITY_DATABASE_GUID +/// for the authorized signature database. +/// +#define EFI_IMAGE_SECURITY_DATABASE L"db" +/// +/// Varialbe name with guid EFI_IMAGE_SECURITY_DATABASE_GUID +/// for the forbidden signature database. +/// +#define EFI_IMAGE_SECURITY_DATABASE1 L"dbx" +/// +/// Variable name with guid EFI_IMAGE_SECURITY_DATABASE_GUID +/// for the timestamp signature database. +/// +#define EFI_IMAGE_SECURITY_DATABASE2 L"dbt" + +#define SECURE_BOOT_MODE_ENABLE 1 +#define SECURE_BOOT_MODE_DISABLE 0 + +#define SETUP_MODE 1 +#define USER_MODE 0 + +//*********************************************************************** +// Signature Database +//*********************************************************************** +/// +/// The format of a signature database. +/// +#pragma pack(1) + +typedef struct { + /// + /// An identifier which identifies the agent which added the signature to the list. + /// + EFI_GUID SignatureOwner; + /// + /// The format of the signature is defined by the SignatureType. + /// + UINT8 SignatureData[1]; +} EFI_SIGNATURE_DATA; + +typedef struct { + /// + /// Type of the signature. GUID signature types are defined in below. + /// + EFI_GUID SignatureType; + /// + /// Total size of the signature list, including this header. + /// + UINT32 SignatureListSize; + /// + /// Size of the signature header which precedes the array of signatures. + /// + UINT32 SignatureHeaderSize; + /// + /// Size of each signature. + /// + UINT32 SignatureSize; + /// + /// Header before the array of signatures. The format of this header is specified + /// by the SignatureType. + /// UINT8 SignatureHeader[SignatureHeaderSize]; + /// + /// An array of signatures. Each signature is SignatureSize bytes in length. + /// EFI_SIGNATURE_DATA Signatures[][SignatureSize]; + /// +} EFI_SIGNATURE_LIST; + +typedef struct { + /// + /// The SHA256 hash of an X.509 certificate's To-Be-Signed contents. + /// + EFI_SHA256_HASH ToBeSignedHash; + /// + /// The time that the certificate shall be considered to be revoked. + /// + EFI_TIME TimeOfRevocation; +} EFI_CERT_X509_SHA256; + +typedef struct { + /// + /// The SHA384 hash of an X.509 certificate's To-Be-Signed contents. + /// + EFI_SHA384_HASH ToBeSignedHash; + /// + /// The time that the certificate shall be considered to be revoked. + /// + EFI_TIME TimeOfRevocation; +} EFI_CERT_X509_SHA384; + +typedef struct { + /// + /// The SHA512 hash of an X.509 certificate's To-Be-Signed contents. + /// + EFI_SHA512_HASH ToBeSignedHash; + /// + /// The time that the certificate shall be considered to be revoked. + /// + EFI_TIME TimeOfRevocation; +} EFI_CERT_X509_SHA512; + +#pragma pack() + +/// +/// This identifies a signature containing a SHA-256 hash. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of SignatureOwner component) + +/// 32 bytes. +/// +#define EFI_CERT_SHA256_GUID \ + { \ + 0xc1c41626, 0x504c, 0x4092, {0xac, 0xa9, 0x41, 0xf9, 0x36, 0x93, 0x43, 0x28} \ + } + +/// +/// This identifies a signature containing an RSA-2048 key. The key (only the modulus +/// since the public key exponent is known to be 0x10001) shall be stored in big-endian +/// order. +/// The SignatureHeader size shall always be 0. The SignatureSize shall always be 16 (size +/// of SignatureOwner component) + 256 bytes. +/// +#define EFI_CERT_RSA2048_GUID \ + { \ + 0x3c5766e8, 0x269c, 0x4e34, {0xaa, 0x14, 0xed, 0x77, 0x6e, 0x85, 0xb3, 0xb6} \ + } + +/// +/// This identifies a signature containing a RSA-2048 signature of a SHA-256 hash. The +/// SignatureHeader size shall always be 0. The SignatureSize shall always be 16 (size of +/// SignatureOwner component) + 256 bytes. +/// +#define EFI_CERT_RSA2048_SHA256_GUID \ + { \ + 0xe2b36190, 0x879b, 0x4a3d, {0xad, 0x8d, 0xf2, 0xe7, 0xbb, 0xa3, 0x27, 0x84} \ + } + +/// +/// This identifies a signature containing a SHA-1 hash. The SignatureSize shall always +/// be 16 (size of SignatureOwner component) + 20 bytes. +/// +#define EFI_CERT_SHA1_GUID \ + { \ + 0x826ca512, 0xcf10, 0x4ac9, {0xb1, 0x87, 0xbe, 0x1, 0x49, 0x66, 0x31, 0xbd} \ + } + +/// +/// TThis identifies a signature containing a RSA-2048 signature of a SHA-1 hash. The +/// SignatureHeader size shall always be 0. The SignatureSize shall always be 16 (size of +/// SignatureOwner component) + 256 bytes. +/// +#define EFI_CERT_RSA2048_SHA1_GUID \ + { \ + 0x67f8444f, 0x8743, 0x48f1, {0xa3, 0x28, 0x1e, 0xaa, 0xb8, 0x73, 0x60, 0x80} \ + } + +/// +/// This identifies a signature based on an X.509 certificate. If the signature is an X.509 +/// certificate then verification of the signature of an image should validate the public +/// key certificate in the image using certificate path verification, up to this X.509 +/// certificate as a trusted root. The SignatureHeader size shall always be 0. The +/// SignatureSize may vary but shall always be 16 (size of the SignatureOwner component) + +/// the size of the certificate itself. +/// Note: This means that each certificate will normally be in a separate EFI_SIGNATURE_LIST. +/// +#define EFI_CERT_X509_GUID \ + { \ + 0xa5c059a1, 0x94e4, 0x4aa7, {0x87, 0xb5, 0xab, 0x15, 0x5c, 0x2b, 0xf0, 0x72} \ + } + +/// +/// This identifies a signature containing a SHA-224 hash. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of SignatureOwner component) + +/// 28 bytes. +/// +#define EFI_CERT_SHA224_GUID \ + { \ + 0xb6e5233, 0xa65c, 0x44c9, {0x94, 0x7, 0xd9, 0xab, 0x83, 0xbf, 0xc8, 0xbd} \ + } + +/// +/// This identifies a signature containing a SHA-384 hash. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of SignatureOwner component) + +/// 48 bytes. +/// +#define EFI_CERT_SHA384_GUID \ + { \ + 0xff3e5307, 0x9fd0, 0x48c9, {0x85, 0xf1, 0x8a, 0xd5, 0x6c, 0x70, 0x1e, 0x1} \ + } + +/// +/// This identifies a signature containing a SHA-512 hash. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of SignatureOwner component) + +/// 64 bytes. +/// +#define EFI_CERT_SHA512_GUID \ + { \ + 0x93e0fae, 0xa6c4, 0x4f50, {0x9f, 0x1b, 0xd4, 0x1e, 0x2b, 0x89, 0xc1, 0x9a} \ + } + +/// +/// This identifies a signature containing the SHA256 hash of an X.509 certificate's +/// To-Be-Signed contents, and a time of revocation. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of the SignatureOwner component) +/// + 48 bytes for an EFI_CERT_X509_SHA256 structure. If the TimeOfRevocation is non-zero, +/// the certificate should be considered to be revoked from that time and onwards, and +/// otherwise the certificate shall be considered to always be revoked. +/// +#define EFI_CERT_X509_SHA256_GUID \ + { \ + 0x3bd2a492, 0x96c0, 0x4079, {0xb4, 0x20, 0xfc, 0xf9, 0x8e, 0xf1, 0x03, 0xed } \ + } + +/// +/// This identifies a signature containing the SHA384 hash of an X.509 certificate's +/// To-Be-Signed contents, and a time of revocation. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of the SignatureOwner component) +/// + 64 bytes for an EFI_CERT_X509_SHA384 structure. If the TimeOfRevocation is non-zero, +/// the certificate should be considered to be revoked from that time and onwards, and +/// otherwise the certificate shall be considered to always be revoked. +/// +#define EFI_CERT_X509_SHA384_GUID \ + { \ + 0x7076876e, 0x80c2, 0x4ee6, {0xaa, 0xd2, 0x28, 0xb3, 0x49, 0xa6, 0x86, 0x5b } \ + } + +/// +/// This identifies a signature containing the SHA512 hash of an X.509 certificate's +/// To-Be-Signed contents, and a time of revocation. The SignatureHeader size shall +/// always be 0. The SignatureSize shall always be 16 (size of the SignatureOwner component) +/// + 80 bytes for an EFI_CERT_X509_SHA512 structure. If the TimeOfRevocation is non-zero, +/// the certificate should be considered to be revoked from that time and onwards, and +/// otherwise the certificate shall be considered to always be revoked. +/// +#define EFI_CERT_X509_SHA512_GUID \ + { \ + 0x446dbf63, 0x2502, 0x4cda, {0xbc, 0xfa, 0x24, 0x65, 0xd2, 0xb0, 0xfe, 0x9d } \ + } + +/// +/// This identifies a signature containing a DER-encoded PKCS #7 version 1.5 [RFC2315] +/// SignedData value. +/// +#define EFI_CERT_TYPE_PKCS7_GUID \ + { \ + 0x4aafd29d, 0x68df, 0x49ee, {0x8a, 0xa9, 0x34, 0x7d, 0x37, 0x56, 0x65, 0xa7} \ + } + +//*********************************************************************** +// Image Execution Information Table Definition +//*********************************************************************** +typedef UINT32 EFI_IMAGE_EXECUTION_ACTION; + +#define EFI_IMAGE_EXECUTION_AUTHENTICATION 0x00000007 +#define EFI_IMAGE_EXECUTION_AUTH_UNTESTED 0x00000000 +#define EFI_IMAGE_EXECUTION_AUTH_SIG_FAILED 0x00000001 +#define EFI_IMAGE_EXECUTION_AUTH_SIG_PASSED 0x00000002 +#define EFI_IMAGE_EXECUTION_AUTH_SIG_NOT_FOUND 0x00000003 +#define EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND 0x00000004 +#define EFI_IMAGE_EXECUTION_POLICY_FAILED 0x00000005 +#define EFI_IMAGE_EXECUTION_INITIALIZED 0x00000008 + +// +// EFI_IMAGE_EXECUTION_INFO is added to EFI System Configuration Table +// and assigned the GUID EFI_IMAGE_SECURITY_DATABASE_GUID. +// +typedef struct { + /// + /// Describes the action taken by the firmware regarding this image. + /// + EFI_IMAGE_EXECUTION_ACTION Action; + /// + /// Size of all of the entire structure. + /// + UINT32 InfoSize; + /// + /// If this image was a UEFI device driver (for option ROM, for example) this is the + /// null-terminated, user-friendly name for the device. If the image was for an application, + /// then this is the name of the application. If this cannot be determined, then a simple + /// NULL character should be put in this position. + /// CHAR16 Name[]; + /// + + /// + /// For device drivers, this is the device path of the device for which this device driver + /// was intended. In some cases, the driver itself may be stored as part of the system + /// firmware, but this field should record the device's path, not the firmware path. For + /// applications, this is the device path of the application. If this cannot be determined, + /// a simple end-of-path device node should be put in this position. + /// EFI_DEVICE_PATH_PROTOCOL DevicePath; + /// + + /// + /// Zero or more image signatures. If the image contained no signatures, + /// then this field is empty. + /// EFI_SIGNATURE_LIST Signature; + /// +} EFI_IMAGE_EXECUTION_INFO; + + +typedef struct { + /// + /// Number of EFI_IMAGE_EXECUTION_INFO structures. + /// + UINTN NumberOfImages; + /// + /// Number of image instances of EFI_IMAGE_EXECUTION_INFO structures. + /// + // EFI_IMAGE_EXECUTION_INFO InformationInfo[] +} EFI_IMAGE_EXECUTION_INFO_TABLE; + +extern EFI_GUID gEfiImageSecurityDatabaseGuid; +extern EFI_GUID gEfiCertSha256Guid; +extern EFI_GUID gEfiCertRsa2048Guid; +extern EFI_GUID gEfiCertRsa2048Sha256Guid; +extern EFI_GUID gEfiCertSha1Guid; +extern EFI_GUID gEfiCertRsa2048Sha1Guid; +extern EFI_GUID gEfiCertX509Guid; +extern EFI_GUID gEfiCertSha224Guid; +extern EFI_GUID gEfiCertSha384Guid; +extern EFI_GUID gEfiCertSha512Guid; +extern EFI_GUID gEfiCertX509Sha256Guid; +extern EFI_GUID gEfiCertX509Sha384Guid; +extern EFI_GUID gEfiCertX509Sha512Guid; +extern EFI_GUID gEfiCertPkcs7Guid; + +#endif Index: stand/efi/include/Protocol/Hash.h =================================================================== --- /dev/null +++ stand/efi/include/Protocol/Hash.h @@ -0,0 +1,178 @@ +/* $FreeBSD$ */ +/** @file + EFI_HASH_SERVICE_BINDING_PROTOCOL as defined in UEFI 2.0. + EFI_HASH_PROTOCOL as defined in UEFI 2.0. + The EFI Hash Service Binding Protocol is used to locate hashing services support + provided by a driver and to create and destroy instances of the EFI Hash Protocol + so that a multiple drivers can use the underlying hashing services. + +Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
+This program and the accompanying materials are licensed and made available under +the terms and conditions of the BSD License that accompanies this distribution. +The full text of the license may be found at +http://opensource.org/licenses/bsd-license.php. + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#ifndef __EFI_HASH_PROTOCOL_H__ +#define __EFI_HASH_PROTOCOL_H__ + +#define CONST const + +#define EFI_HASH_SERVICE_BINDING_PROTOCOL_GUID \ + { \ + 0x42881c98, 0xa4f3, 0x44b0, {0xa3, 0x9d, 0xdf, 0xa1, 0x86, 0x67, 0xd8, 0xcd } \ + } + +#define EFI_HASH_PROTOCOL_GUID \ + { \ + 0xc5184932, 0xdba5, 0x46db, {0xa5, 0xba, 0xcc, 0x0b, 0xda, 0x9c, 0x14, 0x35 } \ + } + +#define EFI_HASH_ALGORITHM_SHA1_GUID \ + { \ + 0x2ae9d80f, 0x3fb2, 0x4095, {0xb7, 0xb1, 0xe9, 0x31, 0x57, 0xb9, 0x46, 0xb6 } \ + } + +#define EFI_HASH_ALGORITHM_SHA224_GUID \ + { \ + 0x8df01a06, 0x9bd5, 0x4bf7, {0xb0, 0x21, 0xdb, 0x4f, 0xd9, 0xcc, 0xf4, 0x5b } \ + } + +#define EFI_HASH_ALGORITHM_SHA256_GUID \ + { \ + 0x51aa59de, 0xfdf2, 0x4ea3, {0xbc, 0x63, 0x87, 0x5f, 0xb7, 0x84, 0x2e, 0xe9 } \ + } + +#define EFI_HASH_ALGORITHM_SHA384_GUID \ + { \ + 0xefa96432, 0xde33, 0x4dd2, {0xae, 0xe6, 0x32, 0x8c, 0x33, 0xdf, 0x77, 0x7a } \ + } + +#define EFI_HASH_ALGORITHM_SHA512_GUID \ + { \ + 0xcaa4381e, 0x750c, 0x4770, {0xb8, 0x70, 0x7a, 0x23, 0xb4, 0xe4, 0x21, 0x30 } \ + } + +#define EFI_HASH_ALGORTIHM_MD5_GUID \ + { \ + 0xaf7c79c, 0x65b5, 0x4319, {0xb0, 0xae, 0x44, 0xec, 0x48, 0x4e, 0x4a, 0xd7 } \ + } + +#define EFI_HASH_ALGORITHM_SHA1_NOPAD_GUID \ + { \ + 0x24c5dc2f, 0x53e2, 0x40ca, {0x9e, 0xd6, 0xa5, 0xd9, 0xa4, 0x9f, 0x46, 0x3b } \ + } + +#define EFI_HASH_ALGORITHM_SHA256_NOPAD_GUID \ + { \ + 0x8628752a, 0x6cb7, 0x4814, {0x96, 0xfc, 0x24, 0xa8, 0x15, 0xac, 0x22, 0x26 } \ + } + +// +// Note: Use of the following algorithms with EFI_HASH_PROTOCOL is deprecated. +// EFI_HASH_ALGORITHM_SHA1_GUID +// EFI_HASH_ALGORITHM_SHA224_GUID +// EFI_HASH_ALGORITHM_SHA256_GUID +// EFI_HASH_ALGORITHM_SHA384_GUID +// EFI_HASH_ALGORITHM_SHA512_GUID +// EFI_HASH_ALGORTIHM_MD5_GUID +// + +typedef struct _EFI_HASH_PROTOCOL EFI_HASH_PROTOCOL; + +typedef UINT8 EFI_MD5_HASH[16]; +typedef UINT8 EFI_SHA1_HASH[20]; +typedef UINT8 EFI_SHA224_HASH[28]; +typedef UINT8 EFI_SHA256_HASH[32]; +typedef UINT8 EFI_SHA384_HASH[48]; +typedef UINT8 EFI_SHA512_HASH[64]; + +typedef union { + EFI_MD5_HASH *Md5Hash; + EFI_SHA1_HASH *Sha1Hash; + EFI_SHA224_HASH *Sha224Hash; + EFI_SHA256_HASH *Sha256Hash; + EFI_SHA384_HASH *Sha384Hash; + EFI_SHA512_HASH *Sha512Hash; +} EFI_HASH_OUTPUT; + +/** + Returns the size of the hash which results from a specific algorithm. + + @param[in] This Points to this instance of EFI_HASH_PROTOCOL. + @param[in] HashAlgorithm Points to the EFI_GUID which identifies the algorithm to use. + @param[out] HashSize Holds the returned size of the algorithm's hash. + + @retval EFI_SUCCESS Hash size returned successfully. + @retval EFI_INVALID_PARAMETER HashSize is NULL or HashAlgorithm is NULL. + @retval EFI_UNSUPPORTED The algorithm specified by HashAlgorithm is not supported + by this driver. + +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_HASH_GET_HASH_SIZE)( + IN CONST EFI_HASH_PROTOCOL *This, + IN CONST EFI_GUID *HashAlgorithm, + OUT UINTN *HashSize + ); + +/** + Creates a hash for the specified message text. + + @param[in] This Points to this instance of EFI_HASH_PROTOCOL. + @param[in] HashAlgorithm Points to the EFI_GUID which identifies the algorithm to use. + @param[in] Extend Specifies whether to create a new hash (FALSE) or extend the specified + existing hash (TRUE). + @param[in] Message Points to the start of the message. + @param[in] MessageSize The size of Message, in bytes. + @param[in,out] Hash On input, if Extend is TRUE, then this parameter holds a pointer + to a pointer to an array containing the hash to extend. If Extend + is FALSE, then this parameter holds a pointer to a pointer to a + caller-allocated array that will receive the result of the hash + computation. On output (regardless of the value of Extend), the + array will contain the result of the hash computation. + + @retval EFI_SUCCESS Hash returned successfully. + @retval EFI_INVALID_PARAMETER Message or Hash, HashAlgorithm is NULL or MessageSize is 0. + MessageSize is not an integer multiple of block size. + @retval EFI_UNSUPPORTED The algorithm specified by HashAlgorithm is not supported by this + driver. Or, Extend is TRUE, and the algorithm doesn't support extending the hash. + +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_HASH_HASH)( + IN CONST EFI_HASH_PROTOCOL *This, + IN CONST EFI_GUID *HashAlgorithm, + IN BOOLEAN Extend, + IN CONST UINT8 *Message, + IN UINT64 MessageSize, + IN OUT EFI_HASH_OUTPUT *Hash + ); + +/// +/// This protocol allows creating a hash of an arbitrary message digest +/// using one or more hash algorithms. +/// +struct _EFI_HASH_PROTOCOL { + EFI_HASH_GET_HASH_SIZE GetHashSize; + EFI_HASH_HASH Hash; +}; + +extern EFI_GUID gEfiHashServiceBindingProtocolGuid; +extern EFI_GUID gEfiHashProtocolGuid; +extern EFI_GUID gEfiHashAlgorithmSha1Guid; +extern EFI_GUID gEfiHashAlgorithmSha224Guid; +extern EFI_GUID gEfiHashAlgorithmSha256Guid; +extern EFI_GUID gEfiHashAlgorithmSha384Guid; +extern EFI_GUID gEfiHashAlgorithmSha512Guid; +extern EFI_GUID gEfiHashAlgorithmMD5Guid; +extern EFI_GUID gEfiHashAlgorithmSha1NoPadGuid; +extern EFI_GUID gEfiHashAlgorithmSha256NoPadGuid; + +#endif Index: stand/efi/include/efiapi.h =================================================================== --- stand/efi/include/efiapi.h +++ stand/efi/include/efiapi.h @@ -28,6 +28,8 @@ --*/ +#include + // // EFI Specification Revision // @@ -210,13 +212,6 @@ ); -// -// EFI platform varibles -// - -#define EFI_GLOBAL_VARIABLE \ - { 0x8BE4DF61, 0x93CA, 0x11d2, {0xAA, 0x0D, 0x00, 0xE0, 0x98, 0x03, 0x2B, 0x8C} } - // Variable attributes #define EFI_VARIABLE_NON_VOLATILE 0x00000001 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x00000002 Index: stand/efi/include/efisecureboot.h =================================================================== --- /dev/null +++ stand/efi/include/efisecureboot.h @@ -0,0 +1,38 @@ +/*- + * Copyright (c) 2019 Stormshield. + * Copyright (c) 2019 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef EFISECUREBOOT_H +#define EFISECUREBOOT_H + +#include + +int efi_secure_boot_enabled(void); +br_x509_certificate* efi_secure_boot_get_CAs(size_t *count); +br_x509_certificate* efi_secure_boot_get_forbidden_CAs(size_t *count); +int efi_secure_boot_cert_forbidden(const char *cert, size_t length); + +#endif /* EFISECUREBOOT_H */ Index: stand/efi/libefi/Makefile =================================================================== --- stand/efi/libefi/Makefile +++ stand/efi/libefi/Makefile @@ -27,6 +27,11 @@ SRCS+= time_event.c .endif +.if ${MK_SECUREBOOT} == "yes" +SRCS+= efisecureboot.c +CFLAGS+= -DSECURE_BOOT +.endif + # We implement a slightly non-standard %S in that it always takes a # CHAR16 that's common in UEFI-land instead of a wchar_t. This only # seems to matter on arm64 where wchar_t defaults to an int instead Index: stand/efi/libefi/efienv.c =================================================================== --- stand/efi/libefi/efienv.c +++ stand/efi/libefi/efienv.c @@ -49,7 +49,7 @@ return (EFI_OUT_OF_RESOURCES); dl = *len; rv = RS->GetVariable(uv, g, &attr, &dl, data); - if (rv == EFI_SUCCESS) + if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL) *len = dl; free(uv); return (rv); Index: stand/efi/libefi/efisecureboot.c =================================================================== --- /dev/null +++ stand/efi/libefi/efisecureboot.c @@ -0,0 +1,240 @@ +/*- + * Copyright (c) 2019 Stormshield. + * Copyright (c) 2019 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +__FBSDID("$FreeBSD$"); + +#include +#include +#include + +#include +#include +#include +#include + +#include + +static EFI_GUID ImageSecurityDatabaseGUID = EFI_IMAGE_SECURITY_DATABASE_GUID; + +static EFI_GUID efiCertX509GUID = EFI_CERT_X509_GUID; +static EFI_GUID efiCertX509Sha256GUID = EFI_CERT_X509_SHA256_GUID; +static EFI_GUID efiCertX509Sha384GUID = EFI_CERT_X509_SHA384_GUID; +static EFI_GUID efiCertX509Sha5122UID = EFI_CERT_X509_SHA512_GUID; + +int +efi_secure_boot_enabled(void) +{ + UINT8 SecureBoot; + UINT8 SetupMode; + size_t length; + EFI_STATUS status; + + length = sizeof SecureBoot; + status = efi_global_getenv("SecureBoot", &SecureBoot, &length); + if (status != EFI_SUCCESS) { + if (status == EFI_NOT_FOUND) + return 0; + + printf("Failed to read \"SecureBoot\" variable\n"); + return -efi_status_to_errno(status); + } + + length = sizeof SecureBoot; + status = efi_global_getenv("SetupMode", &SetupMode, &length); + if (status != EFI_SUCCESS) + SetupMode = 0; + + printf("SecureBoot:%d, SetupMode:%d\n", SecureBoot, SetupMode); + + return (SecureBoot == 1 && SetupMode == 0); +} + +static br_x509_certificate* +efi_get_certs(const char *name, size_t *count) +{ + UINT8 *database; + EFI_SIGNATURE_LIST *list; + EFI_SIGNATURE_DATA *entry; + br_x509_certificate *certs; + size_t length; + size_t cert_count; + EFI_STATUS status; + + database = NULL; + length = 0; + + /* Read variable length and allocate proper buffer. */ + status = efi_getenv(&ImageSecurityDatabaseGUID, name, database, &length); + if (status != EFI_BUFFER_TOO_SMALL) + return NULL; + + database = malloc(length); + if (database == NULL) + return NULL; + + status = efi_getenv(&ImageSecurityDatabaseGUID, name, database, &length); + if (status != EFI_SUCCESS) + return NULL; + + list = (EFI_SIGNATURE_LIST*) database; + certs = NULL; + cert_count = 0; + + for(;length >= list->SignatureListSize && length > 0; + length -= list->SignatureListSize, + list = (EFI_SIGNATURE_LIST*)((UINT8*)list + list->SignatureListSize)) { + if (memcmp(&efiCertX509GUID, &list->SignatureType, + sizeof(EFI_GUID)) != 0) { + continue; + } + + entry = (EFI_SIGNATURE_DATA*) + ((UINT8*)list + + sizeof(EFI_SIGNATURE_LIST) + + list->SignatureHeaderSize); + + certs = realloc(certs, (cert_count + 1) * sizeof(br_x509_certificate)); + if (certs == NULL) + return NULL; + + certs[cert_count].data_len = list->SignatureSize - sizeof(EFI_GUID); + certs[cert_count].data = malloc(certs[cert_count].data_len); + if (certs[cert_count].data == NULL) + goto fail; + + memcpy(certs[cert_count].data, + entry->SignatureData, + certs[cert_count].data_len); + + cert_count++; + } + + *count = cert_count; + + free(database); + return certs; + +fail: + while (cert_count-- > 0) { + free(certs[cert_count].data); + free(&certs[cert_count]); + } + + free(database); + free(certs); + return NULL; + +} + +int +efi_secure_boot_cert_forbidden(const char *cert, size_t cert_length) +{ + UINT8 *database; + EFI_SIGNATURE_LIST *list; + EFI_SIGNATURE_DATA *entry; + size_t length; + size_t header_size; + size_t digest_size; + size_t hash_count; + EFI_STATUS status; + br_hash_compat_context hash_ctx; + const br_hash_class *md; + unsigned char digest[br_sha512_SIZE]; + + length = 0; + + status = efi_getenv(&ImageSecurityDatabaseGUID, "dbx", database, &length); + if (status != EFI_BUFFER_TOO_SMALL) { + if (status == EFI_NOT_FOUND) + return (0); + + return efi_status_to_errno(status); + } + + database = malloc(length); + if (database == NULL) + return ENOMEM; + + status = efi_getenv(&ImageSecurityDatabaseGUID, "dbx", database, &length); + if (status != EFI_SUCCESS) + return efi_status_to_errno(status); + + list = (EFI_SIGNATURE_LIST*) database; + for(;length >= list->SignatureListSize && length > 0; + length -= list->SignatureListSize, + list = (EFI_SIGNATURE_LIST*)((UINT8*)list + list->SignatureListSize)) { + if (memcmp(&efiCertX509Sha256GUID, &list->SignatureType, + sizeof(EFI_GUID)) == 0) { + md = &br_sha256_vtable; + digest_size = br_sha256_SIZE; + } else if(memcmp(&efiCertX509Sha384GUID, &list->SignatureType, + sizeof(EFI_GUID)) == 0) { + md = &br_sha384_vtable; + digest_size = br_sha384_SIZE; + } else if(memcmp(&efiCertX509Sha5122UID, &list->SignatureType, + sizeof(EFI_GUID)) == 0) { + md = &br_sha512_vtable; + digest_size = br_sha512_SIZE; + } else { + continue; + } + + md->init(&hash_ctx.vtable); + md->update(&hash_ctx.vtable, cert, cert_length); + md->out(&hash_ctx.vtable, digest); + + header_size = sizeof(EFI_SIGNATURE_LIST) + list->SignatureHeaderSize; + + hash_count = list->SignatureListSize - header_size; + hash_count /= list->SignatureSize; + + entry = (EFI_SIGNATURE_DATA*)((UINT8*)list + header_size); + while (hash_count-- > 0) { + if (memcmp(digest, entry->SignatureData, digest_size) == 0) + return EACCES; + + entry = (EFI_SIGNATURE_DATA*)(entry + list->SignatureSize); + } + } + + return 0; +} + +/* Copy x509 certificates from db */ +br_x509_certificate* +efi_secure_boot_get_CAs(size_t *count) +{ + return efi_get_certs("db", count); +} + +/* Copy forbidden certificates from dbx */ +br_x509_certificate* +efi_secure_boot_get_forbidden_CAs(size_t *count) +{ + return efi_get_certs("dbx", count); +} Index: stand/efi/loader/Makefile =================================================================== --- stand/efi/loader/Makefile +++ stand/efi/loader/Makefile @@ -36,6 +36,11 @@ CWARNFLAGS.self_reloc.c+= -Wno-error=maybe-uninitialized .endif +.if ${MK_SECUREBOOT} == "yes" +SRCS+= verify.c +CFLAGS+= -DSECURE_BOOT +.endif + # We implement a slightly non-standard %S in that it always takes a # CHAR16 that's common in UEFI-land instead of a wchar_t. This only # seems to matter on arm64 where wchar_t defaults to an int instead Index: stand/efi/loader/main.c =================================================================== --- stand/efi/loader/main.c +++ stand/efi/loader/main.c @@ -43,6 +43,9 @@ #include #include #include +#ifdef SECURE_BOOT +#include +#endif #include @@ -766,6 +769,12 @@ /* Note this needs to be set before ZFS init. */ archsw.arch_zfs_probe = efi_zfs_probe; #endif +#ifdef SECURE_BOOT + archsw.secure_boot_enabled = efi_secure_boot_enabled; + archsw.secure_boot_get_CAs = efi_secure_boot_get_CAs; + archsw.secure_boot_get_forbidden_CAs = efi_secure_boot_get_forbidden_CAs; + archsw.secure_boot_cert_forbidden = efi_secure_boot_cert_forbidden; +#endif /* Get our loaded image protocol interface structure. */ BS->HandleProtocol(IH, &imgid, (VOID**)&img); Index: stand/libsa/Makefile =================================================================== --- stand/libsa/Makefile +++ stand/libsa/Makefile @@ -169,4 +169,9 @@ .include "${SASRC}/zfs/Makefile.inc" .endif +.if ${MK_SECUREBOOT} == "yes" +.include "${SRCTOP}/lib/libbearssl/Makefile.libsa.inc" +.include "${SRCTOP}/lib/libsecureboot/Makefile.libsa.inc" +.endif + .include