mirror of
https://github.com/AsahiLinux/u-boot
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187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Intel Corporation <www.intel.com>
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*
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*/
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#include <asm/arch/mailbox_s10.h>
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#include <asm/arch/secure_vab.h>
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#include <asm/arch/smc_api.h>
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#include <asm/unaligned.h>
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#include <common.h>
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#include <exports.h>
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#include <linux/errno.h>
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#include <linux/intel-smc.h>
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#include <log.h>
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#define CHUNKSZ_PER_WD_RESET (256 * SZ_1K)
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/*
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* Read the length of the VAB certificate from the end of image
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* and calculate the actual image size (excluding the VAB certificate).
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*/
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static size_t get_img_size(u8 *img_buf, size_t img_buf_sz)
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{
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u8 *img_buf_end = img_buf + img_buf_sz;
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u32 cert_sz = get_unaligned_le32(img_buf_end - sizeof(u32));
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u8 *p = img_buf_end - cert_sz - sizeof(u32);
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/* Ensure p is pointing within the img_buf */
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if (p < img_buf || p > (img_buf_end - VAB_CERT_HEADER_SIZE))
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return 0;
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if (get_unaligned_le32(p) == SDM_CERT_MAGIC_NUM)
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return (size_t)(p - img_buf);
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return 0;
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}
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/*
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* Vendor Authorized Boot (VAB) is a security feature for authenticating
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* the images such as U-Boot, ARM trusted Firmware, Linux kernel,
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* device tree blob and etc loaded from FIT. User can also trigger
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* the VAB authentication from U-Boot command.
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*
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* This function extracts the VAB certificate and signature block
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* appended at the end of the image, then send to Secure Device Manager
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* (SDM) for authentication. This function will validate the SHA384
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* of the image against the SHA384 hash stored in the VAB certificate
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* before sending the VAB certificate to SDM for authentication.
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*
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* RETURN
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* 0 if authentication success or
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* if authentication is not required and bypassed on a non-secure device
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* negative error code if authentication fail
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*/
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int socfpga_vendor_authentication(void **p_image, size_t *p_size)
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{
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int retry_count = 20;
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u8 hash384[SHA384_SUM_LEN];
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u64 img_addr, mbox_data_addr;
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size_t img_sz, mbox_data_sz;
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u8 *cert_hash_ptr, *mbox_relocate_data_addr;
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u32 resp = 0, resp_len = 1;
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int ret;
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img_addr = (uintptr_t)*p_image;
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debug("Authenticating image at address 0x%016llx (%ld bytes)\n",
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img_addr, *p_size);
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img_sz = get_img_size((u8 *)img_addr, *p_size);
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debug("img_sz = %ld\n", img_sz);
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if (!img_sz) {
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puts("VAB certificate not found in image!\n");
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return -ENOKEY;
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}
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if (!IS_ALIGNED(img_sz, sizeof(u32))) {
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printf("Image size (%ld bytes) not aliged to 4 bytes!\n",
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img_sz);
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return -EBFONT;
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}
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/* Generate HASH384 from the image */
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sha384_csum_wd((u8 *)img_addr, img_sz, hash384, CHUNKSZ_PER_WD_RESET);
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cert_hash_ptr = (u8 *)(img_addr + img_sz + VAB_CERT_MAGIC_OFFSET +
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VAB_CERT_FIT_SHA384_OFFSET);
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/*
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* Compare the SHA384 found in certificate against the SHA384
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* calculated from image
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*/
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if (memcmp(hash384, cert_hash_ptr, SHA384_SUM_LEN)) {
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puts("SHA384 not match!\n");
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return -EKEYREJECTED;
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}
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mbox_data_addr = img_addr + img_sz - sizeof(u32);
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/* Size in word (32bits) */
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mbox_data_sz = (ALIGN(*p_size - img_sz, sizeof(u32))) >> 2;
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debug("mbox_data_addr = 0x%016llx\n", mbox_data_addr);
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debug("mbox_data_sz = %ld words\n", mbox_data_sz);
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/*
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* Relocate certificate to first memory block before trigger SMC call
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* to send mailbox command because ATF only able to access first
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* memory block.
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*/
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mbox_relocate_data_addr = (u8 *)malloc(mbox_data_sz * sizeof(u32));
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if (!mbox_relocate_data_addr) {
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puts("Out of memory for VAB certificate relocation!\n");
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return -ENOMEM;
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}
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memcpy(mbox_relocate_data_addr, (u8 *)mbox_data_addr, mbox_data_sz * sizeof(u32));
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*(u32 *)mbox_relocate_data_addr = 0;
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debug("mbox_relocate_data_addr = 0x%p\n", mbox_relocate_data_addr);
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do {
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if (!IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_SPL_ATF)) {
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/* Invoke SMC call to ATF to send the VAB certificate to SDM */
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ret = smc_send_mailbox(MBOX_VAB_SRC_CERT, mbox_data_sz,
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(u32 *)mbox_relocate_data_addr, 0, &resp_len,
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&resp);
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} else {
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/* Send the VAB certficate to SDM for authentication */
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ret = mbox_send_cmd(MBOX_ID_UBOOT, MBOX_VAB_SRC_CERT,
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MBOX_CMD_DIRECT, mbox_data_sz,
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(u32 *)mbox_relocate_data_addr, 0, &resp_len,
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&resp);
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}
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/* If SDM is not available, just delay 50ms and retry again */
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if (ret == MBOX_RESP_DEVICE_BUSY)
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mdelay(50);
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else
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break;
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} while (--retry_count);
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/* Free the relocate certificate memory space */
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free(mbox_relocate_data_addr);
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/* Exclude the size of the VAB certificate from image size */
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*p_size = img_sz;
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debug("ret = 0x%08x, resp = 0x%08x, resp_len = %d\n", ret, resp,
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resp_len);
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if (ret) {
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/*
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* Unsupported mailbox command or device not in the
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* owned/secure state
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*/
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if (ret == MBOX_RESP_NOT_ALLOWED_UNDER_SECURITY_SETTINGS) {
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/* SDM bypass authentication */
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printf("%s 0x%016llx (%ld bytes)\n",
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"Image Authentication bypassed at address",
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img_addr, img_sz);
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return 0;
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}
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puts("VAB certificate authentication failed in SDM");
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if (ret == MBOX_RESP_DEVICE_BUSY) {
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puts(" (SDM busy timeout)\n");
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return -ETIMEDOUT;
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} else if (ret == MBOX_RESP_UNKNOWN) {
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puts(" (Not supported)\n");
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return -ESRCH;
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}
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puts("\n");
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return -EKEYREJECTED;
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} else {
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/* If Certificate Process Status has error */
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if (resp) {
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puts("VAB certificate process failed\n");
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return -ENOEXEC;
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}
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}
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printf("%s 0x%016llx (%ld bytes)\n",
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"Image Authentication passed at address", img_addr, img_sz);
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return 0;
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}
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