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SubjectRe: [PATCH v4 16/18] nitro_enclaves: Add sample for ioctl interface usage
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On 22.06.20 22:03, Andra Paraschiv wrote:
> Signed-off-by: Alexandru Vasile <lexnv@amazon.com>
> Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
> ---
> Changelog
>
> v3 -> v4
>
> * Update usage details to match the updates in v4.
> * Update NE ioctl interface usage.
>
> v2 -> v3
>
> * Remove the include directory to use the uapi from the kernel.
> * Remove the GPL additional wording as SPDX-License-Identifier is
> already in place.
>
> v1 -> v2
>
> * New in v2.
> ---
> samples/nitro_enclaves/.gitignore | 2 +
> samples/nitro_enclaves/Makefile | 16 +
> samples/nitro_enclaves/ne_ioctl_sample.c | 520 +++++++++++++++++++++++
> 3 files changed, 538 insertions(+)
> create mode 100644 samples/nitro_enclaves/.gitignore
> create mode 100644 samples/nitro_enclaves/Makefile
> 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..a3ec78fefb52
> --- /dev/null
> +++ b/samples/nitro_enclaves/Makefile
> @@ -0,0 +1,16 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
> +
> +# Enclave lifetime management support for Nitro Enclaves (NE) - ioctl sample
> +# usage.
> +
> +.PHONY: all clean
> +
> +CFLAGS += -Wall
> +
> +all:
> + $(CC) $(CFLAGS) -o ne_ioctl_sample ne_ioctl_sample.c -lpthread
> +
> +clean:
> + rm -f ne_ioctl_sample
> diff --git a/samples/nitro_enclaves/ne_ioctl_sample.c b/samples/nitro_enclaves/ne_ioctl_sample.c
> new file mode 100644
> index 000000000000..572143d55d77
> --- /dev/null
> +++ b/samples/nitro_enclaves/ne_ioctl_sample.c
> @@ -0,0 +1,520 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
> + */
> +
> +/**
> + * 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. The
> + * enclave CPUs need to be full cores from the same NUMA node. CPU 0 and its
> + * siblings have to remain available for the primary / parent VM, so they
> + * cannot be included in 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
> + * lsmod
> + *
> + * The CPU pool can be set at runtime, after the kernel module is loaded.
> + *
> + * echo <cpu-list> > /sys/module/nitro_enclaves/parameters/ne_cpus
> + *
> + * NUMA and CPU siblings information can be found using
> + *
> + * lscpu
> + * /proc/cpuinfo
> + *
> + * Check the online / offline CPU list. The CPUs from the pool should be
> + * offlined.
> + *
> + * lscpu
> + *
> + * Check dmesg for any warnings / errors through the NE driver lifetime / usage.
> + * The NE logs contain the "nitro_enclaves" or "pci 0000:00:02.0" pattern.
> + *
> + * dmesg
> + *
> + * Setup hugetlbfs huge pages. The memory needs to be from the same NUMA node as
> + * the enclave CPUs.
> + * https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
> + *
> + * echo <nr_hugepages> > /proc/sys/vm/nr_hugepages
> + *
> + * or set the number of 2 MiB / 1 GiB hugepages using
> + *
> + * /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
> + * /sys/kernel/mm/hugepages/hugepages-1048576kB/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"
> +#define NE_EXPECTED_API_VERSION (1)
> +
> +/* Timeout in seconds / milliseconds for each poll event. */
> +#define NE_POLL_WAIT_TIME (60)
> +#define NE_POLL_WAIT_TIME_MS (NE_POLL_WAIT_TIME * 1000)
> +
> +/* Amount of time in seconds for the process to keep the enclave alive. */
> +#define NE_SLEEP_TIME (300)
> +
> +/* Enclave vCPUs metadata. */
> +#define NE_DEFAULT_NR_VCPUS (2)
> +
> +/* Enclave memory metadata */
> +
> +/* Min memory size - 2 MiB */
> +#define NE_MIN_MEM_REGION_SIZE (2 * 1024 * 1024)
> +
> +/* 256 memory regions of 2 MiB */
> +#define NE_DEFAULT_NR_MEM_REGIONS (256)
> +
> +/* Vsock addressing for enclave image loading heartbeat. */
> +#define NE_IMAGE_LOAD_VSOCK_CID (3)
> +#define NE_IMAGE_LOAD_VSOCK_PORT (9000)
> +#define NE_IMAGE_LOAD_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, NE_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 * NE_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. */
> +static 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. */
> +static int ne_load_enclave_image(int enclave_fd,
> + struct ne_mem_region ne_mem_regions[], char enclave_image_path[])
> +{
> + struct ne_image_load_info image_load_info = {};
> + int rc = 0;
> +
> + if (enclave_fd < 0)
> + return -EINVAL;
> +
> + image_load_info.flags = NE_EIF_IMAGE;
> +
> + rc = ioctl(enclave_fd, NE_GET_IMAGE_LOAD_INFO, &image_load_info);
> + if (rc < 0) {
> + printf("Error in get image load info [rc=%d]\n", rc);
> +
> + return rc;
> + }
> +
> + printf("Enclave image offset in enclave memory is %lld\n",
> + image_load_info.memory_offset);
> +
> + /*
> + * TODO: Copy enclave image in enclave memory starting from the given
> + * offset.
> + */

Just open and read into the buffer at the given offset? :)

> +
> + return 0;
> +}
> +
> +/* Wait for a hearbeat from the enclave to check it has booted. */
> +static 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 = NE_IMAGE_LOAD_VSOCK_CID,
> + .svm_port = NE_IMAGE_LOAD_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, NE_POLL_WAIT_TIME_MS);
> + if (rc < 0) {
> + printf("Error in poll [%m]\n");
> +
> + goto out;
> + }
> +
> + if (!rc) {
> + printf("Poll timeout, %d seconds elapsed\n", NE_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 != NE_IMAGE_LOAD_HEARTBEAT_VALUE) {
> + printf("Read %d instead of %d\n", recv_buf,
> + NE_IMAGE_LOAD_HEARTBEAT_VALUE);
> +
> + goto out;
> + }
> +
> + close(server_vsock_fd);
> +
> + return 0;
> +
> +out:
> + close(server_vsock_fd);
> +
> + return rc;
> +}
> +
> +/* Set memory region for the given enclave. */
> +static int ne_set_mem_region(int enclave_fd, struct ne_mem_region ne_mem_region)
> +{
> + struct ne_user_memory_region mem_region = {};
> + int rc = 0;
> +
> + if (enclave_fd < 0)
> + return -EINVAL;
> +
> + mem_region.memory_size = ne_mem_region.mem_size;
> + mem_region.userspace_addr = (__u64)ne_mem_region.mem_addr;
> +
> + rc = ioctl(enclave_fd, NE_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. */
> +static void ne_free_mem_regions(struct ne_mem_region ne_mem_regions[])
> +{
> + unsigned int i = 0;
> +
> + for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++)
> + munmap(ne_mem_regions[i].mem_addr, ne_mem_regions[i].mem_size);
> +}
> +
> +/* Create enclave vCPU. */
> +static 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, NE_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). */
> +static void ne_release_vcpus(struct ne_vcpu ne_vcpus[])
> +{
> + unsigned int i = 0;
> +
> + for (i = 0; i < NE_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] = {};
> + struct ne_enclave_start_info enclave_start_info = {};
> + unsigned int i = 0;
> + int ne_api_version = 0;
> + int ne_dev_fd = 0;
> + struct ne_mem_region ne_mem_regions[NE_DEFAULT_NR_MEM_REGIONS] = {};
> + struct ne_vcpu ne_vcpus[NE_DEFAULT_NR_VCPUS] = {};
> + int rc = 0;
> + unsigned long slot_uid = 0;
> + pthread_t thread_id = 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);

Why can you not just pass argv[1] as path?

> +
> + 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);
> + }
> +
> + ne_api_version = ioctl(ne_dev_fd, NE_GET_API_VERSION);
> + if (ne_api_version != NE_EXPECTED_API_VERSION) {
> + printf("Expected API version %d, provided API version %d\n",
> + NE_EXPECTED_API_VERSION, ne_api_version);
> +
> + close(ne_dev_fd);
> +
> + exit(EXIT_FAILURE);
> + }
> +
> + printf("Creating enclave slot ...\n");
> +
> + enclave_fd = ioctl(ne_dev_fd, NE_CREATE_VM, &slot_uid);
> +
> + 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 < NE_DEFAULT_NR_MEM_REGIONS; i++) {
> + ne_mem_regions[i].mem_size = NE_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 < NE_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 < NE_DEFAULT_NR_VCPUS; i++) {
> + /*
> + * The vCPU is chosen from the enclave vCPU pool, if the value
> + * of the vcpu_id is 0.
> + */
> + ne_vcpus[i].vcpu_id = 0;
> + 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, &enclave_start_info);
> + if (rc < 0) {
> + printf("Error in start enclave [rc=%d]\n", rc);
> +
> + goto release_enclave_vcpu_fds;
> + }
> +
> + printf("Enclave started, CID %llu\n", enclave_start_info.enclave_cid);
> +
> + /*
> + * TODO: Check for enclave hearbeat after it has started to see if it
> + * has booted.
> + */

So you wrote the function to check for the heartbeat, but don't call it?
Why?


Alex

> +
> + printf("Entering sleep for %d seconds ...\n", NE_SLEEP_TIME);
> +
> + sleep(NE_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);
> +}
>



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