[PATCH v24 14/24] selftests/x86: Add a selftest for SGX
From: Jarkko Sakkinen
Date: Fri Nov 29 2019 - 18:16:31 EST
Add a selftest for SGX. It is a trivial test where a simple enclave
copies one 64-bit word of memory between two memory locations given to
the enclave as arguments. Use ENCLS[EENTER] to invoke the enclave.
Cc: linux-sgx@xxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
tools/testing/selftests/x86/sgx/Makefile | 47 ++
tools/testing/selftests/x86/sgx/defines.h | 39 ++
tools/testing/selftests/x86/sgx/encl.c | 20 +
tools/testing/selftests/x86/sgx/encl.lds | 34 ++
.../selftests/x86/sgx/encl_bootstrap.S | 94 ++++
tools/testing/selftests/x86/sgx/main.c | 249 +++++++++
tools/testing/selftests/x86/sgx/sgx_call.S | 23 +
tools/testing/selftests/x86/sgx/sgx_call.h | 11 +
tools/testing/selftests/x86/sgx/sgxsign.c | 493 ++++++++++++++++++
.../testing/selftests/x86/sgx/signing_key.pem | 39 ++
10 files changed, 1049 insertions(+)
create mode 100644 tools/testing/selftests/x86/sgx/Makefile
create mode 100644 tools/testing/selftests/x86/sgx/defines.h
create mode 100644 tools/testing/selftests/x86/sgx/encl.c
create mode 100644 tools/testing/selftests/x86/sgx/encl.lds
create mode 100644 tools/testing/selftests/x86/sgx/encl_bootstrap.S
create mode 100644 tools/testing/selftests/x86/sgx/main.c
create mode 100644 tools/testing/selftests/x86/sgx/sgx_call.S
create mode 100644 tools/testing/selftests/x86/sgx/sgx_call.h
create mode 100644 tools/testing/selftests/x86/sgx/sgxsign.c
create mode 100644 tools/testing/selftests/x86/sgx/signing_key.pem
diff --git a/tools/testing/selftests/x86/sgx/Makefile b/tools/testing/selftests/x86/sgx/Makefile
new file mode 100644
index 000000000000..a09ef5f965dc
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/Makefile
@@ -0,0 +1,47 @@
+top_srcdir = ../../../../..
+
+include ../../lib.mk
+
+ifndef OBJCOPY
+OBJCOPY := $(CROSS_COMPILE)objcopy
+endif
+
+HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC -z noexecstack
+ENCL_CFLAGS := -Wall -Werror -static -nostdlib -nostartfiles -fPIC \
+ -fno-stack-protector -mrdrnd $(INCLUDES)
+
+TEST_CUSTOM_PROGS := $(OUTPUT)/test_sgx $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
+
+all: $(TEST_CUSTOM_PROGS)
+
+$(OUTPUT)/test_sgx: $(OUTPUT)/main.o $(OUTPUT)/sgx_call.o
+ $(CC) $(HOST_CFLAGS) -o $@ $^
+
+$(OUTPUT)/main.o: main.c
+ $(CC) $(HOST_CFLAGS) -c $< -o $@
+
+$(OUTPUT)/sgx_call.o: sgx_call.S
+ $(CC) $(HOST_CFLAGS) -c $< -o $@
+
+$(OUTPUT)/encl.bin: $(OUTPUT)/encl.elf $(OUTPUT)/sgxsign
+ $(OBJCOPY) -O binary $< $@
+
+$(OUTPUT)/encl.elf: encl.lds encl.c encl_bootstrap.S
+ $(CC) $(ENCL_CFLAGS) -T $^ -o $@
+
+$(OUTPUT)/encl.ss: $(OUTPUT)/encl.bin
+ $(OUTPUT)/sgxsign signing_key.pem $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
+
+$(OUTPUT)/sgxsign: sgxsign.c
+ $(CC) -o $@ $< -lcrypto
+
+EXTRA_CLEAN := \
+ $(OUTPUT)/encl.bin \
+ $(OUTPUT)/encl.elf \
+ $(OUTPUT)/encl.ss \
+ $(OUTPUT)/sgx_call.o \
+ $(OUTPUT)/sgxsign \
+ $(OUTPUT)/test_sgx \
+ $(OUTPUT)/test_sgx.o \
+
+.PHONY: clean
diff --git a/tools/testing/selftests/x86/sgx/defines.h b/tools/testing/selftests/x86/sgx/defines.h
new file mode 100644
index 000000000000..1e67f2f29f42
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/defines.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright(c) 2016-19 Intel Corporation.
+ */
+
+#ifndef DEFINES_H
+#define DEFINES_H
+
+#include <stdint.h>
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint64_t u64;
+
+#define __aligned(x) __attribute__((__aligned__(x)))
+#define __packed __attribute__((packed))
+
+/* Derived from asm-generic/bitsperlong.h. */
+#if __x86_64__
+#define BITS_PER_LONG 64
+#else
+#define BITS_PER_LONG 32
+#endif
+#define BITS_PER_LONG_LONG 64
+
+/* Taken from linux/bits.h. */
+#define BIT(nr) (1UL << (nr))
+#define BIT_ULL(nr) (1ULL << (nr))
+#define GENMASK(h, l) \
+ (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+#define GENMASK_ULL(h, l) \
+ (((~0ULL) - (1ULL << (l)) + 1) & \
+ (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
+
+#include "../../../../../arch/x86/kernel/cpu/sgx/arch.h"
+#include "../../../../../arch/x86/include/uapi/asm/sgx.h"
+
+#endif /* DEFINES_H */
diff --git a/tools/testing/selftests/x86/sgx/encl.c b/tools/testing/selftests/x86/sgx/encl.c
new file mode 100644
index 000000000000..ede915399742
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/encl.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-18 Intel Corporation.
+
+#include <stddef.h>
+#include "defines.h"
+
+static void *memcpy(void *dest, const void *src, size_t n)
+{
+ size_t i;
+
+ for (i = 0; i < n; i++)
+ ((char *)dest)[i] = ((char *)src)[i];
+
+ return dest;
+}
+
+void encl_body(void *rdi, void *rsi)
+{
+ memcpy(rsi, rdi, 8);
+}
diff --git a/tools/testing/selftests/x86/sgx/encl.lds b/tools/testing/selftests/x86/sgx/encl.lds
new file mode 100644
index 000000000000..9a56d3064104
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/encl.lds
@@ -0,0 +1,34 @@
+OUTPUT_FORMAT(elf64-x86-64)
+
+SECTIONS
+{
+ . = 0;
+ .tcs : {
+ *(.tcs*)
+ }
+
+ . = ALIGN(4096);
+ .text : {
+ *(.text*)
+ *(.rodata*)
+ }
+
+ . = ALIGN(4096);
+ .data : {
+ *(.data*)
+ }
+
+ /DISCARD/ : {
+ *(.data*)
+ *(.comment*)
+ *(.note*)
+ *(.debug*)
+ *(.eh_frame*)
+ }
+}
+
+ASSERT(!DEFINED(.altinstructions), "ALTERNATIVES are not supported in enclaves")
+ASSERT(!DEFINED(.altinstr_replacement), "ALTERNATIVES are not supported in enclaves")
+ASSERT(!DEFINED(.discard.retpoline_safe), "RETPOLINE ALTERNATIVES are not supported in enclaves")
+ASSERT(!DEFINED(.discard.nospec), "RETPOLINE ALTERNATIVES are not supported in enclaves")
+ASSERT(!DEFINED(.got.plt), "Libcalls are not supported in enclaves")
diff --git a/tools/testing/selftests/x86/sgx/encl_bootstrap.S b/tools/testing/selftests/x86/sgx/encl_bootstrap.S
new file mode 100644
index 000000000000..d07f970ccdf9
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/encl_bootstrap.S
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
+/*
+ * Copyright(c) 2016-18 Intel Corporation.
+ */
+
+ .macro ENCLU
+ .byte 0x0f, 0x01, 0xd7
+ .endm
+
+ .section ".tcs", "a"
+ .balign 4096
+
+ .fill 1, 8, 0 # STATE (set by CPU)
+ .fill 1, 8, 0 # FLAGS
+ .quad encl_ssa # OSSA
+ .fill 1, 4, 0 # CSSA (set by CPU)
+ .fill 1, 4, 1 # NSSA
+ .quad encl_entry # OENTRY
+ .fill 1, 8, 0 # AEP (set by EENTER and ERESUME)
+ .fill 1, 8, 0 # OFSBASE
+ .fill 1, 8, 0 # OGSBASE
+ .fill 1, 4, 0xFFFFFFFF # FSLIMIT
+ .fill 1, 4, 0xFFFFFFFF # GSLIMIT
+ .fill 4024, 1, 0 # Reserved
+
+ .text
+
+encl_entry:
+ # RBX contains the base address for TCS, which is also the first address
+ # inside the enclave. By adding the value of le_stack_end to it, we get
+ # the absolute address for the stack.
+ lea (encl_stack)(%rbx), %rax
+ xchg %rsp, %rax
+ push %rax
+
+ push %rcx # push the address after EENTER
+ push %rbx # push the enclave base address
+
+ call encl_body
+
+ pop %rbx # pop the enclave base address
+
+ # Restore XSAVE registers to a synthetic state.
+ mov $0xFFFFFFFF, %rax
+ mov $0xFFFFFFFF, %rdx
+ lea (xsave_area)(%rbx), %rdi
+ fxrstor (%rdi)
+
+ # Clear GPRs.
+ xor %rcx, %rcx
+ xor %rdx, %rdx
+ xor %rdi, %rdi
+ xor %rsi, %rsi
+ xor %r8, %r8
+ xor %r9, %r9
+ xor %r10, %r10
+ xor %r11, %r11
+ xor %r12, %r12
+ xor %r13, %r13
+ xor %r14, %r14
+ xor %r15, %r15
+
+ # Reset status flags.
+ add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1
+
+ # Prepare EEXIT target by popping the address of the instruction after
+ # EENTER to RBX.
+ pop %rbx
+
+ # Restore the caller stack.
+ pop %rax
+ mov %rax, %rsp
+
+ # EEXIT
+ mov $4, %rax
+ enclu
+
+ .section ".data", "aw"
+
+encl_ssa:
+ .space 4096
+
+xsave_area:
+ .fill 1, 4, 0x037F # FCW
+ .fill 5, 4, 0
+ .fill 1, 4, 0x1F80 # MXCSR
+ .fill 1, 4, 0xFFFF # MXCSR_MASK
+ .fill 123, 4, 0
+ .fill 1, 4, 0x80000000 # XCOMP_BV[63] = 1, compaction mode
+ .fill 12, 4, 0
+
+ .balign 4096
+ .space 8192
+encl_stack:
diff --git a/tools/testing/selftests/x86/sgx/main.c b/tools/testing/selftests/x86/sgx/main.c
new file mode 100644
index 000000000000..06c761c83cdf
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/main.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-18 Intel Corporation.
+
+#include <elf.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include "defines.h"
+#include "../../../../../arch/x86/kernel/cpu/sgx/arch.h"
+#include "../../../../../arch/x86/include/uapi/asm/sgx.h"
+#include "sgx_call.h"
+
+#define PAGE_SIZE 4096
+
+static const uint64_t MAGIC = 0x1122334455667788ULL;
+
+static bool encl_create(int dev_fd, unsigned long bin_size,
+ struct sgx_secs *secs)
+{
+ struct sgx_enclave_create ioc;
+ void *area;
+ int rc;
+
+ memset(secs, 0, sizeof(*secs));
+ secs->ssa_frame_size = 1;
+ secs->attributes = SGX_ATTR_MODE64BIT;
+ secs->xfrm = 3;
+
+ for (secs->size = 4096; secs->size < bin_size; )
+ secs->size <<= 1;
+
+ area = mmap(NULL, secs->size * 2, PROT_NONE, MAP_SHARED, dev_fd, 0);
+ if (area == MAP_FAILED) {
+ perror("mmap");
+ return false;
+ }
+
+ secs->base = ((uint64_t)area + secs->size - 1) & ~(secs->size - 1);
+
+ munmap(area, secs->base - (uint64_t)area);
+ munmap((void *)(secs->base + secs->size),
+ (uint64_t)area + secs->size - secs->base);
+
+ ioc.src = (unsigned long)secs;
+ rc = ioctl(dev_fd, SGX_IOC_ENCLAVE_CREATE, &ioc);
+ if (rc) {
+ fprintf(stderr, "ECREATE failed rc=%d, err=%d.\n", rc, errno);
+ munmap((void *)secs->base, secs->size);
+ return false;
+ }
+
+ return true;
+}
+
+static bool encl_add_pages(int dev_fd, unsigned long offset, void *data,
+ unsigned long length, uint64_t flags)
+{
+ struct sgx_enclave_add_pages ioc;
+ struct sgx_secinfo secinfo;
+ int rc;
+
+ memset(&secinfo, 0, sizeof(secinfo));
+ secinfo.flags = flags;
+
+ ioc.src = (uint64_t)data;
+ ioc.offset = offset;
+ ioc.length = length;
+ ioc.secinfo = (unsigned long)&secinfo;
+ ioc.flags = SGX_PAGE_MEASURE;
+
+ rc = ioctl(dev_fd, SGX_IOC_ENCLAVE_ADD_PAGES, &ioc);
+ if (rc) {
+ fprintf(stderr, "EADD failed rc=%d.\n", rc);
+ return false;
+ }
+
+ if (ioc.count != ioc.length) {
+ fprintf(stderr, "Partially processed, update the test.\n");
+ return false;
+ }
+
+ return true;
+}
+
+#define SGX_REG_PAGE_FLAGS \
+ (SGX_SECINFO_REG | SGX_SECINFO_R | SGX_SECINFO_W | SGX_SECINFO_X)
+
+static bool encl_build(struct sgx_secs *secs, void *bin,
+ unsigned long bin_size, struct sgx_sigstruct *sigstruct)
+{
+ struct sgx_enclave_init ioc;
+ void *addr;
+ int dev_fd;
+ int rc;
+
+ dev_fd = open("/dev/sgx/enclave", O_RDWR);
+ if (dev_fd < 0) {
+ fprintf(stderr, "Unable to open /dev/sgx\n");
+ return false;
+ }
+
+ if (!encl_create(dev_fd, bin_size, secs))
+ goto out_dev_fd;
+
+ if (!encl_add_pages(dev_fd, 0, bin, PAGE_SIZE, SGX_SECINFO_TCS))
+ goto out_dev_fd;
+
+ if (!encl_add_pages(dev_fd, PAGE_SIZE, bin + PAGE_SIZE,
+ bin_size - PAGE_SIZE, SGX_REG_PAGE_FLAGS))
+ goto out_dev_fd;
+
+ ioc.sigstruct = (uint64_t)sigstruct;
+ rc = ioctl(dev_fd, SGX_IOC_ENCLAVE_INIT, &ioc);
+ if (rc) {
+ printf("EINIT failed rc=%d\n", rc);
+ goto out_map;
+ }
+
+ addr = mmap((void *)secs->base, PAGE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_FIXED, dev_fd, 0);
+ if (addr == MAP_FAILED) {
+ fprintf(stderr, "mmap() failed on TCS, errno=%d.\n", errno);
+ return false;
+ }
+
+ addr = mmap((void *)(secs->base + PAGE_SIZE), bin_size - PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_SHARED | MAP_FIXED, dev_fd, 0);
+ if (addr == MAP_FAILED) {
+ fprintf(stderr, "mmap() failed, errno=%d.\n", errno);
+ return false;
+ }
+
+ close(dev_fd);
+ return true;
+out_map:
+ munmap((void *)secs->base, secs->size);
+out_dev_fd:
+ close(dev_fd);
+ return false;
+}
+
+bool get_file_size(const char *path, off_t *bin_size)
+{
+ struct stat sb;
+ int ret;
+
+ ret = stat(path, &sb);
+ if (ret) {
+ perror("stat");
+ return false;
+ }
+
+ if (!sb.st_size || sb.st_size & 0xfff) {
+ fprintf(stderr, "Invalid blob size %lu\n", sb.st_size);
+ return false;
+ }
+
+ *bin_size = sb.st_size;
+ return true;
+}
+
+bool encl_data_map(const char *path, void **bin, off_t *bin_size)
+{
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ fprintf(stderr, "open() %s failed, errno=%d.\n", path, errno);
+ return false;
+ }
+
+ if (!get_file_size(path, bin_size))
+ goto err_out;
+
+ *bin = mmap(NULL, *bin_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (*bin == MAP_FAILED) {
+ fprintf(stderr, "mmap() %s failed, errno=%d.\n", path, errno);
+ goto err_out;
+ }
+
+ close(fd);
+ return true;
+
+err_out:
+ close(fd);
+ return false;
+}
+
+bool load_sigstruct(const char *path, void *sigstruct)
+{
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ fprintf(stderr, "open() %s failed, errno=%d.\n", path, errno);
+ return false;
+ }
+
+ if (read(fd, sigstruct, sizeof(struct sgx_sigstruct)) !=
+ sizeof(struct sgx_sigstruct)) {
+ fprintf(stderr, "read() %s failed, errno=%d.\n", path, errno);
+ close(fd);
+ return false;
+ }
+
+ close(fd);
+ return true;
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ struct sgx_sigstruct sigstruct;
+ struct sgx_secs secs;
+ uint64_t result = 0;
+ off_t bin_size;
+ void *bin;
+
+ if (!encl_data_map("encl.bin", &bin, &bin_size))
+ exit(1);
+
+ if (!load_sigstruct("encl.ss", &sigstruct))
+ exit(1);
+
+ if (!encl_build(&secs, bin, bin_size, &sigstruct))
+ exit(1);
+
+ printf("Input: 0x%lx\n", MAGIC);
+
+ sgx_call_eenter((void *)&MAGIC, &result, (void *)secs.base);
+ if (result != MAGIC) {
+ fprintf(stderr, "0x%lx != 0x%lx\n", result, MAGIC);
+ exit(1);
+ }
+
+ printf("Output: 0x%lx\n", result);
+
+ exit(0);
+}
diff --git a/tools/testing/selftests/x86/sgx/sgx_call.S b/tools/testing/selftests/x86/sgx/sgx_call.S
new file mode 100644
index 000000000000..ca4c7893f9d9
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/sgx_call.S
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
+/**
+* Copyright(c) 2016-18 Intel Corporation.
+*/
+
+ .text
+
+ .macro ENCLU
+ .byte 0x0f, 0x01, 0xd7
+ .endm
+
+ .text
+
+ .global sgx_call_eenter
+sgx_call_eenter:
+ push %rbx
+ mov $0x02, %rax
+ mov %rdx, %rbx
+ lea sgx_async_exit(%rip), %rcx
+sgx_async_exit:
+ ENCLU
+ pop %rbx
+ ret
diff --git a/tools/testing/selftests/x86/sgx/sgx_call.h b/tools/testing/selftests/x86/sgx/sgx_call.h
new file mode 100644
index 000000000000..bf72068ada23
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/sgx_call.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright(c) 2016-19 Intel Corporation.
+ */
+
+#ifndef SGX_CALL_H
+#define SGX_CALL_H
+
+void sgx_call_eenter(void *rdi, void *rsi, void *entry);
+
+#endif /* SGX_CALL_H */
diff --git a/tools/testing/selftests/x86/sgx/sgxsign.c b/tools/testing/selftests/x86/sgx/sgxsign.c
new file mode 100644
index 000000000000..3d9007af40c9
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/sgxsign.c
@@ -0,0 +1,493 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-18 Intel Corporation.
+
+#define _GNU_SOURCE
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include "defines.h"
+
+struct sgx_sigstruct_payload {
+ struct sgx_sigstruct_header header;
+ struct sgx_sigstruct_body body;
+};
+
+static bool check_crypto_errors(void)
+{
+ int err;
+ bool had_errors = false;
+ const char *filename;
+ int line;
+ char str[256];
+
+ for ( ; ; ) {
+ if (ERR_peek_error() == 0)
+ break;
+
+ had_errors = true;
+ err = ERR_get_error_line(&filename, &line);
+ ERR_error_string_n(err, str, sizeof(str));
+ fprintf(stderr, "crypto: %s: %s:%d\n", str, filename, line);
+ }
+
+ return had_errors;
+}
+
+static void exit_usage(const char *program)
+{
+ fprintf(stderr,
+ "Usage: %s/sign-le <key> <enclave> <sigstruct>\n", program);
+ exit(1);
+}
+
+static inline const BIGNUM *get_modulus(RSA *key)
+{
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ return key->n;
+#else
+ const BIGNUM *n;
+
+ RSA_get0_key(key, &n, NULL, NULL);
+ return n;
+#endif
+}
+
+static RSA *load_sign_key(const char *path)
+{
+ FILE *f;
+ RSA *key;
+
+ f = fopen(path, "rb");
+ if (!f) {
+ fprintf(stderr, "Unable to open %s\n", path);
+ return NULL;
+ }
+ key = RSA_new();
+ if (!PEM_read_RSAPrivateKey(f, &key, NULL, NULL))
+ return NULL;
+ fclose(f);
+
+ if (BN_num_bytes(get_modulus(key)) != SGX_MODULUS_SIZE) {
+ fprintf(stderr, "Invalid key size %d\n",
+ BN_num_bytes(get_modulus(key)));
+ RSA_free(key);
+ return NULL;
+ }
+
+ return key;
+}
+
+static void reverse_bytes(void *data, int length)
+{
+ int i = 0;
+ int j = length - 1;
+ uint8_t temp;
+ uint8_t *ptr = data;
+
+ while (i < j) {
+ temp = ptr[i];
+ ptr[i] = ptr[j];
+ ptr[j] = temp;
+ i++;
+ j--;
+ }
+}
+
+enum mrtags {
+ MRECREATE = 0x0045544145524345,
+ MREADD = 0x0000000044444145,
+ MREEXTEND = 0x00444E4554584545,
+};
+
+static bool mrenclave_update(EVP_MD_CTX *ctx, const void *data)
+{
+ if (!EVP_DigestUpdate(ctx, data, 64)) {
+ fprintf(stderr, "digest update failed\n");
+ return false;
+ }
+
+ return true;
+}
+
+static bool mrenclave_commit(EVP_MD_CTX *ctx, uint8_t *mrenclave)
+{
+ unsigned int size;
+
+ if (!EVP_DigestFinal_ex(ctx, (unsigned char *)mrenclave, &size)) {
+ fprintf(stderr, "digest commit failed\n");
+ return false;
+ }
+
+ if (size != 32) {
+ fprintf(stderr, "invalid digest size = %u\n", size);
+ return false;
+ }
+
+ return true;
+}
+
+struct mrecreate {
+ uint64_t tag;
+ uint32_t ssaframesize;
+ uint64_t size;
+ uint8_t reserved[44];
+} __attribute__((__packed__));
+
+
+static bool mrenclave_ecreate(EVP_MD_CTX *ctx, uint64_t blob_size)
+{
+ struct mrecreate mrecreate;
+ uint64_t encl_size;
+
+ for (encl_size = 0x1000; encl_size < blob_size; )
+ encl_size <<= 1;
+
+ memset(&mrecreate, 0, sizeof(mrecreate));
+ mrecreate.tag = MRECREATE;
+ mrecreate.ssaframesize = 1;
+ mrecreate.size = encl_size;
+
+ if (!EVP_DigestInit_ex(ctx, EVP_sha256(), NULL))
+ return false;
+
+ return mrenclave_update(ctx, &mrecreate);
+}
+
+struct mreadd {
+ uint64_t tag;
+ uint64_t offset;
+ uint64_t flags; /* SECINFO flags */
+ uint8_t reserved[40];
+} __attribute__((__packed__));
+
+static bool mrenclave_eadd(EVP_MD_CTX *ctx, uint64_t offset, uint64_t flags)
+{
+ struct mreadd mreadd;
+
+ memset(&mreadd, 0, sizeof(mreadd));
+ mreadd.tag = MREADD;
+ mreadd.offset = offset;
+ mreadd.flags = flags;
+
+ return mrenclave_update(ctx, &mreadd);
+}
+
+struct mreextend {
+ uint64_t tag;
+ uint64_t offset;
+ uint8_t reserved[48];
+} __attribute__((__packed__));
+
+static bool mrenclave_eextend(EVP_MD_CTX *ctx, uint64_t offset, uint8_t *data)
+{
+ struct mreextend mreextend;
+ int i;
+
+ for (i = 0; i < 0x1000; i += 0x100) {
+ memset(&mreextend, 0, sizeof(mreextend));
+ mreextend.tag = MREEXTEND;
+ mreextend.offset = offset + i;
+
+ if (!mrenclave_update(ctx, &mreextend))
+ return false;
+
+ if (!mrenclave_update(ctx, &data[i + 0x00]))
+ return false;
+
+ if (!mrenclave_update(ctx, &data[i + 0x40]))
+ return false;
+
+ if (!mrenclave_update(ctx, &data[i + 0x80]))
+ return false;
+
+ if (!mrenclave_update(ctx, &data[i + 0xC0]))
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * measure_encl - measure enclave
+ * @path: path to the enclave
+ * @mrenclave: measurement
+ *
+ * Calculates MRENCLAVE. Assumes that the very first page is a TCS page and
+ * following pages are regular pages. Does not measure the contents of the
+ * enclave as the signing tool is used at the moment only for the launch
+ * enclave, which is pass-through (everything gets a token).
+ */
+static bool measure_encl(const char *path, uint8_t *mrenclave)
+{
+ FILE *file;
+ struct stat sb;
+ EVP_MD_CTX *ctx;
+ uint64_t flags;
+ uint64_t offset;
+ uint8_t data[0x1000];
+ int rc;
+
+ ctx = EVP_MD_CTX_create();
+ if (!ctx)
+ return false;
+
+ file = fopen(path, "rb");
+ if (!file) {
+ perror("fopen");
+ EVP_MD_CTX_destroy(ctx);
+ return false;
+ }
+
+ rc = stat(path, &sb);
+ if (rc) {
+ perror("stat");
+ goto out;
+ }
+
+ if (!sb.st_size || sb.st_size & 0xfff) {
+ fprintf(stderr, "Invalid blob size %lu\n", sb.st_size);
+ goto out;
+ }
+
+ if (!mrenclave_ecreate(ctx, sb.st_size))
+ goto out;
+
+ for (offset = 0; offset < sb.st_size; offset += 0x1000) {
+ if (!offset)
+ flags = SGX_SECINFO_TCS;
+ else
+ flags = SGX_SECINFO_REG | SGX_SECINFO_R |
+ SGX_SECINFO_W | SGX_SECINFO_X;
+
+ if (!mrenclave_eadd(ctx, offset, flags))
+ goto out;
+
+ rc = fread(data, 1, 0x1000, file);
+ if (!rc)
+ break;
+ if (rc < 0x1000)
+ goto out;
+
+ if (!mrenclave_eextend(ctx, offset, data))
+ goto out;
+ }
+
+ if (!mrenclave_commit(ctx, mrenclave))
+ goto out;
+
+ fclose(file);
+ EVP_MD_CTX_destroy(ctx);
+ return true;
+out:
+ fclose(file);
+ EVP_MD_CTX_destroy(ctx);
+ return false;
+}
+
+/**
+ * sign_encl - sign enclave
+ * @sigstruct: pointer to SIGSTRUCT
+ * @key: 3072-bit RSA key
+ * @signature: byte array for the signature
+ *
+ * Calculates EMSA-PKCSv1.5 signature for the given SIGSTRUCT. The result is
+ * stored in big-endian format so that it can be further passed to OpenSSL
+ * libcrypto functions.
+ */
+static bool sign_encl(const struct sgx_sigstruct *sigstruct, RSA *key,
+ uint8_t *signature)
+{
+ struct sgx_sigstruct_payload payload;
+ unsigned int siglen;
+ uint8_t digest[SHA256_DIGEST_LENGTH];
+ bool ret;
+
+ memcpy(&payload.header, &sigstruct->header, sizeof(sigstruct->header));
+ memcpy(&payload.body, &sigstruct->body, sizeof(sigstruct->body));
+
+ SHA256((unsigned char *)&payload, sizeof(payload), digest);
+
+ ret = RSA_sign(NID_sha256, digest, SHA256_DIGEST_LENGTH, signature,
+ &siglen, key);
+
+ return ret;
+}
+
+struct q1q2_ctx {
+ BN_CTX *bn_ctx;
+ BIGNUM *m;
+ BIGNUM *s;
+ BIGNUM *q1;
+ BIGNUM *qr;
+ BIGNUM *q2;
+};
+
+static void free_q1q2_ctx(struct q1q2_ctx *ctx)
+{
+ BN_CTX_free(ctx->bn_ctx);
+ BN_free(ctx->m);
+ BN_free(ctx->s);
+ BN_free(ctx->q1);
+ BN_free(ctx->qr);
+ BN_free(ctx->q2);
+}
+
+static bool alloc_q1q2_ctx(const uint8_t *s, const uint8_t *m,
+ struct q1q2_ctx *ctx)
+{
+ ctx->bn_ctx = BN_CTX_new();
+ ctx->s = BN_bin2bn(s, SGX_MODULUS_SIZE, NULL);
+ ctx->m = BN_bin2bn(m, SGX_MODULUS_SIZE, NULL);
+ ctx->q1 = BN_new();
+ ctx->qr = BN_new();
+ ctx->q2 = BN_new();
+
+ if (!ctx->bn_ctx || !ctx->s || !ctx->m || !ctx->q1 || !ctx->qr ||
+ !ctx->q2) {
+ free_q1q2_ctx(ctx);
+ return false;
+ }
+
+ return true;
+}
+
+static bool calc_q1q2(const uint8_t *s, const uint8_t *m, uint8_t *q1,
+ uint8_t *q2)
+{
+ struct q1q2_ctx ctx;
+
+ if (!alloc_q1q2_ctx(s, m, &ctx)) {
+ fprintf(stderr, "Not enough memory for Q1Q2 calculation\n");
+ return false;
+ }
+
+ if (!BN_mul(ctx.q1, ctx.s, ctx.s, ctx.bn_ctx))
+ goto out;
+
+ if (!BN_div(ctx.q1, ctx.qr, ctx.q1, ctx.m, ctx.bn_ctx))
+ goto out;
+
+ if (BN_num_bytes(ctx.q1) > SGX_MODULUS_SIZE) {
+ fprintf(stderr, "Too large Q1 %d bytes\n",
+ BN_num_bytes(ctx.q1));
+ goto out;
+ }
+
+ if (!BN_mul(ctx.q2, ctx.s, ctx.qr, ctx.bn_ctx))
+ goto out;
+
+ if (!BN_div(ctx.q2, NULL, ctx.q2, ctx.m, ctx.bn_ctx))
+ goto out;
+
+ if (BN_num_bytes(ctx.q2) > SGX_MODULUS_SIZE) {
+ fprintf(stderr, "Too large Q2 %d bytes\n",
+ BN_num_bytes(ctx.q2));
+ goto out;
+ }
+
+ BN_bn2bin(ctx.q1, q1);
+ BN_bn2bin(ctx.q2, q2);
+
+ free_q1q2_ctx(&ctx);
+ return true;
+out:
+ free_q1q2_ctx(&ctx);
+ return false;
+}
+
+static bool save_sigstruct(const struct sgx_sigstruct *sigstruct,
+ const char *path)
+{
+ FILE *f = fopen(path, "wb");
+
+ if (!f) {
+ fprintf(stderr, "Unable to open %s\n", path);
+ return false;
+ }
+
+ fwrite(sigstruct, sizeof(*sigstruct), 1, f);
+ fclose(f);
+ return true;
+}
+
+int main(int argc, char **argv)
+{
+ uint64_t header1[2] = {0x000000E100000006, 0x0000000000010000};
+ uint64_t header2[2] = {0x0000006000000101, 0x0000000100000060};
+ struct sgx_sigstruct ss;
+ const char *program;
+ int opt;
+ RSA *sign_key;
+
+ memset(&ss, 0, sizeof(ss));
+ ss.header.header1[0] = header1[0];
+ ss.header.header1[1] = header1[1];
+ ss.header.header2[0] = header2[0];
+ ss.header.header2[1] = header2[1];
+ ss.exponent = 3;
+
+#ifndef CONFIG_EINITTOKENKEY
+ ss.body.attributes = SGX_ATTR_MODE64BIT;
+#else
+ ss.body.attributes = SGX_ATTR_MODE64BIT | SGX_ATTR_EINITTOKENKEY;
+#endif
+ ss.body.xfrm = 3,
+
+ program = argv[0];
+
+ do {
+ opt = getopt(argc, argv, "");
+ switch (opt) {
+ case -1:
+ break;
+ default:
+ exit_usage(program);
+ }
+ } while (opt != -1);
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc < 3)
+ exit_usage(program);
+
+ /* sanity check only */
+ if (check_crypto_errors())
+ exit(1);
+
+ sign_key = load_sign_key(argv[0]);
+ if (!sign_key)
+ goto out;
+
+ BN_bn2bin(get_modulus(sign_key), ss.modulus);
+
+ if (!measure_encl(argv[1], ss.body.mrenclave))
+ goto out;
+
+ if (!sign_encl(&ss, sign_key, ss.signature))
+ goto out;
+
+ if (!calc_q1q2(ss.signature, ss.modulus, ss.q1, ss.q2))
+ goto out;
+
+ /* convert to little endian */
+ reverse_bytes(ss.signature, SGX_MODULUS_SIZE);
+ reverse_bytes(ss.modulus, SGX_MODULUS_SIZE);
+ reverse_bytes(ss.q1, SGX_MODULUS_SIZE);
+ reverse_bytes(ss.q2, SGX_MODULUS_SIZE);
+
+ if (!save_sigstruct(&ss, argv[2]))
+ goto out;
+ exit(0);
+out:
+ check_crypto_errors();
+ exit(1);
+}
diff --git a/tools/testing/selftests/x86/sgx/signing_key.pem b/tools/testing/selftests/x86/sgx/signing_key.pem
new file mode 100644
index 000000000000..d76f21f19187
--- /dev/null
+++ b/tools/testing/selftests/x86/sgx/signing_key.pem
@@ -0,0 +1,39 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
--
2.20.1