[PATCH v2 16/18] nitro_enclaves: Add sample for ioctl interface usage

Andra Paraschiv
2020-05-22T06:32:50Z

Signed-off-by: Alexandru Vasile <lexnv@amazon.com>
Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
---
samples/nitro_enclaves/.gitignore | 2 +
samples/nitro_enclaves/Makefile | 28 +
.../include/linux/nitro_enclaves.h | 23 +
.../include/uapi/linux/nitro_enclaves.h | 77 +++
samples/nitro_enclaves/ne_ioctl_sample.c | 502 ++++++++++++++++++
5 files changed, 632 insertions(+)
create mode 100644 samples/nitro_enclaves/.gitignore
create mode 100644 samples/nitro_enclaves/Makefile
create mode 100644 samples/nitro_enclaves/include/linux/nitro_enclaves.h
create mode 100644 samples/nitro_enclaves/include/uapi/linux/nitro_enclaves.h
create mode 100644 samples/nitro_enclaves/ne_ioctl_sample.c

diff --git a/samples/nitro_enclaves/.gitignore b/samples/nitro_enclaves/.gitignore
new file mode 100644
index 000000000000..827934129c90
--- /dev/null
+++ b/samples/nitro_enclaves/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+ne_ioctl_sample
diff --git a/samples/nitro_enclaves/Makefile b/samples/nitro_enclaves/Makefile
new file mode 100644
index 000000000000..2acdc6e0c492
--- /dev/null
+++ b/samples/nitro_enclaves/Makefile
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+# Enclave lifetime management support for Nitro Enclaves (NE) - ioctl sample
+# usage.
+
+.PHONY: all clean
+
+CFLAGS += -Wall -Iinclude/
+
+all:
+ $(CC) $(CFLAGS) -o ne_ioctl_sample ne_ioctl_sample.c -lpthread
+
+clean:
+ rm -f ne_ioctl_sample
diff --git a/samples/nitro_enclaves/include/linux/nitro_enclaves.h b/samples/nitro_enclaves/include/linux/nitro_enclaves.h
new file mode 100644
index 000000000000..7e593a9fbf8c
--- /dev/null
+++ b/samples/nitro_enclaves/include/linux/nitro_enclaves.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _LINUX_NITRO_ENCLAVES_H_
+#define _LINUX_NITRO_ENCLAVES_H_
+
+#include <uapi/linux/nitro_enclaves.h>
+
+#endif /* _LINUX_NITRO_ENCLAVES_H_ */
diff --git a/samples/nitro_enclaves/include/uapi/linux/nitro_enclaves.h b/samples/nitro_enclaves/include/uapi/linux/nitro_enclaves.h
new file mode 100644
index 000000000000..98ba59f15b52
--- /dev/null
+++ b/samples/nitro_enclaves/include/uapi/linux/nitro_enclaves.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _UAPI_LINUX_NITRO_ENCLAVES_H_
+#define _UAPI_LINUX_NITRO_ENCLAVES_H_
+
+#include <linux/kvm.h>
+#include <linux/types.h>
+
+/* Nitro Enclaves (NE) Kernel Driver Interface */
+
+/**
+ * The command is used to get information needed for in-memory enclave image
+ * loading e.g. offset in enclave memory to start placing the enclave image.
+ *
+ * The image load metadata is an in / out data structure. It includes info
+ * provided by the caller - flags - and returns the offset in enclave memory
+ * where to start placing the enclave image.
+ */
+#define NE_GET_IMAGE_LOAD_METADATA _IOWR(0xAE, 0x20, struct image_load_metadata)
+
+/**
+ * The command is used to trigger enclave start after the enclave resources,
+ * such as memory and CPU, have been set.
+ *
+ * The enclave start metadata is an in / out data structure. It includes info
+ * provided by the caller - enclave cid and flags - and returns the slot uid
+ * and the cid (if input cid is 0).
+ */
+#define NE_START_ENCLAVE _IOWR(0xAE, 0x21, struct enclave_start_metadata)
+
+/* Metadata necessary for in-memory enclave image loading. */
+struct image_load_metadata {
+ /**
+ * Flags to determine the enclave image type e.g. Enclave Image Format
+ * (EIF) (in).
+ */
+ __u64 flags;
+
+ /**
+ * Offset in enclave memory where to start placing the enclave image
+ * (out).
+ */
+ __u64 memory_offset;
+};
+
+/* Setup metadata necessary for enclave start. */
+struct enclave_start_metadata {
+ /* Flags for the enclave to start with (e.g. debug mode) (in). */
+ __u64 flags;
+
+ /**
+ * Context ID (CID) for the enclave vsock device. If 0 as input, the
+ * CID is autogenerated by the hypervisor and returned back as output
+ * by the driver (in/out).
+ */
+ __u64 enclave_cid;
+
+ /* Slot unique id mapped to the enclave to start (out). */
+ __u64 slot_uid;
+};
+
+#endif /* _UAPI_LINUX_NITRO_ENCLAVES_H_ */
diff --git a/samples/nitro_enclaves/ne_ioctl_sample.c b/samples/nitro_enclaves/ne_ioctl_sample.c
new file mode 100644
index 000000000000..c9a164b7193e
--- /dev/null
+++ b/samples/nitro_enclaves/ne_ioctl_sample.c
@@ -0,0 +1,502 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Sample flow of using the ioctl interface provided by the Nitro Enclaves (NE)
+ * kernel driver.
+ *
+ * Usage
+ * -----
+ *
+ * Load the nitro_enclaves module, setting also the enclave CPU pool.
+ *
+ * See the cpu list section from the kernel documentation.
+ * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
+ *
+ * insmod drivers/virt/nitro_enclaves/nitro_enclaves.ko ne_cpus=<cpu-list>
+ * lsmod
+ *
+ * Check dmesg for any warnings / errors through the NE driver lifetime / usage.
+ * The NE logs contain the "nitro_enclaves" pattern.
+ *
+ * dmesg
+ *
+ * Check the online / offline CPU list. The CPUs from the pool should be
+ * offlined.
+ *
+ * lscpu
+ *
+ * Setup hugetlbfs huge pages.
+ *
+ * echo <nr_hugepages> > /proc/sys/vm/nr_hugepages
+ *
+ * In this example 256 hugepages of 2 MiB are used.
+ *
+ * Build and run the NE sample.
+ *
+ * make -C samples/nitro_enclaves clean
+ * make -C samples/nitro_enclaves
+ * ./samples/nitro_enclaves/ne_ioctl_sample <path_to_enclave_image>
+ *
+ * Unload the nitro_enclaves module.
+ *
+ * rmmod nitro_enclaves
+ * lsmod
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <poll.h>
+#include <pthread.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/eventfd.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <linux/nitro_enclaves.h>
+#include <linux/vm_sockets.h>
+
+/* Nitro Enclaves (NE) misc device that provides the ioctl interface. */
+#define NE_DEV_NAME "/dev/nitro_enclaves"
+
+/* Timeout in seconds / milliseconds for each poll event. */
+#define POLL_WAIT_TIME (60)
+#define POLL_WAIT_TIME_MS (POLL_WAIT_TIME * 1000)
+
+/* Amount of time in seconds for the process to keep the enclave alive. */
+#define SLEEP_TIME (300)
+
+/* Enclave vCPUs metadata. */
+#define DEFAULT_NR_VCPUS (2)
+
+/* Enclave memory metadata */
+/* Min memory size - 2 MiB */
+#define MIN_MEM_REGION_SIZE (2 * 1024 * 1024)
+/* 256 memory regions of 2 MiB */
+#define DEFAULT_NR_MEM_REGIONS (256)
+
+/* Vsock addressing for enclave image loading heartbeat. */
+#define VSOCK_CID (3)
+#define VSOCK_PORT (9000)
+#define HEARTBEAT_VALUE (0xb7)
+
+struct ne_mem_region {
+ void *mem_addr;
+ size_t mem_size;
+};
+
+struct ne_vcpu {
+ int vcpu_fd;
+ unsigned int vcpu_id;
+};
+
+/* Thread function for polling the enclave fd. */
+void *ne_poll_enclave_fd(void *data)
+{
+ int enclave_fd = *(int *)data;
+ struct pollfd fds[1] = {};
+ int i = 0;
+ int rc = 0;
+
+ printf("Running from poll thread, enclave fd %d\n", enclave_fd);
+
+ fds[0].fd = enclave_fd;
+ fds[0].events = POLLIN | POLLERR | POLLHUP;
+
+ /* Keep on polling until the current process is terminated. */
+ while (1) {
+ printf("[iter %d] Polling ...\n", i);
+
+ rc = poll(fds, 1, POLL_WAIT_TIME_MS);
+ if (rc < 0) {
+ printf("Error in poll [%m]\n");
+
+ return NULL;
+ }
+
+ i++;
+
+ if (!rc) {
+ printf("Poll: %d seconds elapsed\n",
+ i * POLL_WAIT_TIME);
+
+ continue;
+ }
+
+ printf("Poll received value %d\n", fds[0].revents);
+ }
+
+ return NULL;
+}
+
+/* Allocate memory region that will be used for the enclave. */
+int ne_alloc_mem_region(struct ne_mem_region *ne_mem_region)
+{
+ if (!ne_mem_region)
+ return -EINVAL;
+
+ if (!ne_mem_region->mem_size)
+ return -EINVAL;
+
+ ne_mem_region->mem_addr = mmap(NULL, ne_mem_region->mem_size,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS |
+ MAP_HUGETLB, -1, 0);
+ if (ne_mem_region->mem_addr == MAP_FAILED) {
+ printf("Error in mmap memory [%m]\n");
+
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Place enclave image in enclave memory. */
+int ne_load_enclave_image(int enclave_fd, struct ne_mem_region ne_mem_regions[],
+ char enclave_image_path[])
+{
+ struct image_load_metadata image_load_metadata = {};
+ int rc = 0;
+
+ if (enclave_fd < 0)
+ return -EINVAL;
+
+ /* TODO: Set flags based on enclave image type. */
+ image_load_metadata.flags = 0;
+
+ rc = ioctl(enclave_fd, NE_GET_IMAGE_LOAD_METADATA,
+ &image_load_metadata);
+ if (rc < 0) {
+ printf("Error in get image load metadata [rc=%d]\n", rc);
+
+ return rc;
+ }
+
+ printf("Enclave image offset in enclave memory is %lld\n",
+ image_load_metadata.memory_offset);
+
+ /*
+ * TODO: Copy enclave image in enclave memory starting from the given
+ * offset.
+ */
+
+ return 0;
+}
+
+/* Wait for a hearbeat from the enclave to check it has booted. */
+int ne_check_enclave_booted(void)
+{
+ struct sockaddr_vm client_vsock_addr = {};
+ socklen_t client_vsock_len = sizeof(client_vsock_addr);
+ struct pollfd fds[1] = {};
+ int rc = 0;
+ unsigned char recv_buf = 0;
+ struct sockaddr_vm server_vsock_addr = {
+ .svm_family = AF_VSOCK,
+ .svm_cid = VSOCK_CID,
+ .svm_port = VSOCK_PORT,
+ };
+ int server_vsock_fd = 0;
+
+ server_vsock_fd = socket(AF_VSOCK, SOCK_STREAM, 0);
+ if (server_vsock_fd < 0) {
+ rc = server_vsock_fd;
+
+ printf("Error in socket [rc=%d]\n", rc);
+
+ return rc;
+ }
+
+ rc = bind(server_vsock_fd, (struct sockaddr *)&server_vsock_addr,
+ sizeof(server_vsock_addr));
+ if (rc < 0) {
+ printf("Error in bind [rc=%d]\n", rc);
+
+ goto out;
+ }
+
+ rc = listen(server_vsock_fd, 1);
+ if (rc < 0) {
+ printf("Error in listen [rc=%d]\n", rc);
+
+ goto out;
+ }
+
+ fds[0].fd = server_vsock_fd;
+ fds[0].events = POLLIN;
+
+ rc = poll(fds, 1, POLL_WAIT_TIME_MS);
+ if (rc < 0) {
+ printf("Error in poll [%m]\n");
+
+ goto out;
+ }
+
+ if (!rc) {
+ printf("Poll timeout, %d seconds elapsed\n", POLL_WAIT_TIME);
+
+ rc = -ETIMEDOUT;
+
+ goto out;
+ }
+
+ if ((fds[0].revents & POLLIN) == 0) {
+ printf("Poll received value %d\n", fds[0].revents);
+
+ rc = -EINVAL;
+
+ goto out;
+ }
+
+ rc = accept(server_vsock_fd, (struct sockaddr *)&client_vsock_addr,
+ &client_vsock_len);
+ if (rc < 0) {
+ printf("Error in accept [rc=%d]\n", rc);
+
+ goto out;
+ }
+
+ /*
+ * Read the heartbeat value that the init process in the enclave sends
+ * after vsock connect.
+ */
+ rc = read(server_vsock_fd, &recv_buf, sizeof(recv_buf));
+ if (rc < 0) {
+ printf("Error in read [rc=%d]\n", rc);
+
+ goto out;
+ }
+
+ if (rc != sizeof(recv_buf) || recv_buf != HEARTBEAT_VALUE) {
+ printf("Read %d instead of %d\n", recv_buf, HEARTBEAT_VALUE);
+
+ goto out;
+ }
+
+ close(server_vsock_fd);
+
+ return 0;
+
+out:
+ close(server_vsock_fd);
+
+ return rc;
+}
+
+/* Set memory region for the given enclave. */
+int ne_set_mem_region(int enclave_fd, struct ne_mem_region ne_mem_region)
+{
+ struct kvm_userspace_memory_region mem_region = {};
+ int rc = 0;
+
+ if (enclave_fd < 0)
+ return -EINVAL;
+
+ mem_region.slot = 0;
+ mem_region.memory_size = ne_mem_region.mem_size;
+ mem_region.userspace_addr = (__u64)ne_mem_region.mem_addr;
+ mem_region.guest_phys_addr = 0;
+
+ rc = ioctl(enclave_fd, KVM_SET_USER_MEMORY_REGION, &mem_region);
+ if (rc < 0) {
+ printf("Error in set user memory region [rc=%d]\n", rc);
+
+ return rc;
+ }
+
+ return 0;
+}
+
+/* Unmap all the memory regions that were set aside for the enclave. */
+void ne_free_mem_regions(struct ne_mem_region ne_mem_regions[])
+{
+ unsigned int i = 0;
+
+ for (i = 0; i < DEFAULT_NR_MEM_REGIONS; i++)
+ munmap(ne_mem_regions[i].mem_addr, ne_mem_regions[i].mem_size);
+}
+
+/* Create enclave vCPU. */
+int ne_create_vcpu(int enclave_fd, struct ne_vcpu *ne_vcpu)
+{
+ if (enclave_fd < 0)
+ return -EINVAL;
+
+ if (!ne_vcpu)
+ return -EINVAL;
+
+ ne_vcpu->vcpu_fd = ioctl(enclave_fd, KVM_CREATE_VCPU,
+ &ne_vcpu->vcpu_id);
+ if (ne_vcpu->vcpu_fd < 0) {
+ printf("Error in create vcpu [rc=%d]\n", ne_vcpu->vcpu_fd);
+
+ return ne_vcpu->vcpu_fd;
+ }
+
+ return 0;
+}
+
+/* Release enclave vCPU fd(s). */
+void ne_release_vcpus(struct ne_vcpu ne_vcpus[])
+{
+ unsigned int i = 0;
+
+ for (i = 0; i < DEFAULT_NR_VCPUS; i++)
+ if (ne_vcpus[i].vcpu_fd > 0)
+ close(ne_vcpus[i].vcpu_fd);
+}
+
+int main(int argc, char *argv[])
+{
+ int enclave_fd = 0;
+ char enclave_image_path[PATH_MAX] = {};
+ unsigned int i = 0;
+ int ne_dev_fd = 0;
+ struct ne_mem_region ne_mem_regions[DEFAULT_NR_MEM_REGIONS] = {};
+ struct enclave_start_metadata ne_start_metadata = {};
+ struct ne_vcpu ne_vcpus[DEFAULT_NR_VCPUS] = {};
+ int rc = 0;
+ pthread_t thread_id = 0;
+ unsigned long type = 0;
+
+ if (argc != 2) {
+ printf("Usage: %s <path_to_enclave_image>\n", argv[0]);
+
+ exit(EXIT_FAILURE);
+ }
+
+ strncpy(enclave_image_path, argv[1], sizeof(enclave_image_path) - 1);
+
+ ne_dev_fd = open(NE_DEV_NAME, O_RDWR | O_CLOEXEC);
+ if (ne_dev_fd < 0) {
+ printf("Error in open NE device [rc=%d]\n", ne_dev_fd);
+
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Creating enclave slot ...\n");
+
+ enclave_fd = ioctl(ne_dev_fd, KVM_CREATE_VM, &type);
+
+ close(ne_dev_fd);
+
+ if (enclave_fd < 0) {
+ printf("Error in create enclave slot [rc=%d]\n", enclave_fd);
+
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Enclave fd %d\n", enclave_fd);
+
+ rc = pthread_create(&thread_id, NULL, ne_poll_enclave_fd,
+ (void *)&enclave_fd);
+ if (rc < 0) {
+ printf("Error in thread create [rc=%d]\n", rc);
+
+ close(enclave_fd);
+
+ exit(EXIT_FAILURE);
+ }
+
+ for (i = 0; i < DEFAULT_NR_MEM_REGIONS; i++) {
+ ne_mem_regions[i].mem_size = MIN_MEM_REGION_SIZE;
+ rc = ne_alloc_mem_region(&ne_mem_regions[i]);
+ if (rc < 0) {
+ printf("Error in alloc mem region, iter %d [rc=%d]\n",
+ i, rc);
+
+ goto release_enclave_fd;
+ }
+ }
+
+ rc = ne_load_enclave_image(enclave_fd, ne_mem_regions,
+ enclave_image_path);
+ if (rc < 0) {
+ printf("Error in load enclave image [rc=%d]\n", rc);
+
+ goto release_enclave_fd;
+ }
+
+ for (i = 0; i < DEFAULT_NR_MEM_REGIONS; i++) {
+ rc = ne_set_mem_region(enclave_fd, ne_mem_regions[i]);
+ if (rc < 0) {
+ printf("Error in set mem region, iter %d [rc=%d]\n",
+ i, rc);
+
+ goto release_enclave_fd;
+ }
+ }
+
+ printf("Enclave memory regions were added\n");
+
+ for (i = 0; i < DEFAULT_NR_VCPUS; i++) {
+ /*
+ * The vCPU is chosen from the enclave vCPU pool, this value is
+ * not used for now.
+ */
+ ne_vcpus[i].vcpu_id = i;
+ rc = ne_create_vcpu(enclave_fd, &ne_vcpus[i]);
+ if (rc < 0) {
+ printf("Error in create vcpu, iter %d [rc=%d]\n",
+ i, rc);
+
+ goto release_enclave_vcpu_fds;
+ }
+ }
+
+ printf("Enclave vCPUs were created\n");
+
+ rc = ioctl(enclave_fd, NE_START_ENCLAVE, &ne_start_metadata);
+ if (rc < 0) {
+ printf("Error in start enclave [rc=%d]\n", rc);
+
+ goto release_enclave_vcpu_fds;
+ }
+
+ printf("Enclave started, CID %llu\n", ne_start_metadata.enclave_cid);
+
+ /*
+ * TODO: Check for enclave hearbeat after it has started to see if it
+ * has booted.
+ */
+
+ printf("Entering sleep for %d seconds ...\n", SLEEP_TIME);
+
+ sleep(SLEEP_TIME);
+
+ ne_release_vcpus(ne_vcpus);
+
+ close(enclave_fd);
+
+ ne_free_mem_regions(ne_mem_regions);
+
+ exit(EXIT_SUCCESS);
+
+release_enclave_vcpu_fds:
+ ne_release_vcpus(ne_vcpus);
+release_enclave_fd:
+ close(enclave_fd);
+ ne_free_mem_regions(ne_mem_regions);
+
+ exit(EXIT_FAILURE);
+}
--
2.20.1 (Apple Git-117)