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@@ -0,0 +1,417 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright (c) 2013, Google Inc.
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+ */
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+
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+#ifdef USE_HOSTCC
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+#include "mkimage.h"
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+#include <time.h>
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+#else
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+#include <common.h>
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+#include <malloc.h>
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+DECLARE_GLOBAL_DATA_PTR;
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+#endif /* !USE_HOSTCC*/
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+#include <image.h>
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+#include <u-boot/rsa.h>
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+#include <u-boot/rsa-checksum.h>
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+
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+#define IMAGE_MAX_HASHED_NODES 100
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+
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+#ifdef USE_HOSTCC
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+void *host_blob;
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+
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+void image_set_host_blob(void *blob)
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+{
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+ host_blob = blob;
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+}
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+
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+void *image_get_host_blob(void)
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+{
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+ return host_blob;
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+}
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+#endif
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+
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+/**
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+ * fit_region_make_list() - Make a list of image regions
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+ *
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+ * Given a list of fdt_regions, create a list of image_regions. This is a
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+ * simple conversion routine since the FDT and image code use different
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+ * structures.
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+ *
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+ * @fit: FIT image
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+ * @fdt_regions: Pointer to FDT regions
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+ * @count: Number of FDT regions
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+ * @region: Pointer to image regions, which must hold @count records. If
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+ * region is NULL, then (except for an SPL build) the array will be
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+ * allocated.
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+ * @return: Pointer to image regions
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+ */
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+struct image_region *fit_region_make_list(const void *fit,
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+ struct fdt_region *fdt_regions,
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+ int count,
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+ struct image_region *region)
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+{
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+ int i;
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+
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+ debug("Hash regions:\n");
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+ debug("%10s %10s\n", "Offset", "Size");
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+
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+ /*
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+ * Use malloc() except in SPL (to save code size). In SPL the caller
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+ * must allocate the array.
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+ */
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+#ifndef CONFIG_SPL_BUILD
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+ if (!region)
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+ region = calloc(sizeof(*region), count);
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+#endif
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+ if (!region)
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+ return NULL;
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+ for (i = 0; i < count; i++) {
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+ debug("%10x %10x\n", fdt_regions[i].offset,
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+ fdt_regions[i].size);
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+ region[i].data = fit + fdt_regions[i].offset;
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+ region[i].size = fdt_regions[i].size;
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+ }
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+
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+ return region;
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+}
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+
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+static int fit_image_setup_verify(struct image_sign_info *info,
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+ const void *fit, int noffset,
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+ int required_keynode, char **err_msgp)
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+{
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+ char *algo_name;
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+ const char *padding_name;
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+
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+ if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
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+ *err_msgp = "Total size too large";
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+ return 1;
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+ }
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+
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+ if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
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+ *err_msgp = "Can't get hash algo property";
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+ return -1;
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+ }
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+
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+ padding_name = fdt_getprop(fit, noffset, "padding", NULL);
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+ if (!padding_name)
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+ padding_name = RSA_DEFAULT_PADDING_NAME;
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+
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+ memset(info, '\0', sizeof(*info));
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+ info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
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+ info->fit = (void *)fit;
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+ info->node_offset = noffset;
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+ info->name = algo_name;
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+ info->checksum = image_get_checksum_algo(algo_name);
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+ info->crypto = image_get_crypto_algo(algo_name);
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+ info->padding = image_get_padding_algo(padding_name);
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+ info->fdt_blob = gd_fdt_blob();
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+ info->required_keynode = required_keynode;
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+ printf("%s:%s", algo_name, info->keyname);
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+
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+ if (!info->checksum || !info->crypto || !info->padding) {
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+ *err_msgp = "Unknown signature algorithm";
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+int fit_image_check_sig(const void *fit, int noffset, const void *data,
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+ size_t size, int required_keynode, char **err_msgp)
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+{
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+ struct image_sign_info info;
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+ struct image_region region;
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+ uint8_t *fit_value;
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+ int fit_value_len;
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+
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+ *err_msgp = NULL;
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+ if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
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+ err_msgp))
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+ return -1;
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+
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+ if (fit_image_hash_get_value(fit, noffset, &fit_value,
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+ &fit_value_len)) {
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+ *err_msgp = "Can't get hash value property";
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+ return -1;
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+ }
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+
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+ region.data = data;
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+ region.size = size;
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+
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+ if (info.crypto->verify(&info, ®ion, 1, fit_value, fit_value_len)) {
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+ *err_msgp = "Verification failed";
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+static int fit_image_verify_sig(const void *fit, int image_noffset,
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+ const char *data, size_t size,
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+ const void *sig_blob, int sig_offset)
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+{
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+ int noffset;
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+ char *err_msg = "";
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+ int verified = 0;
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+ int ret;
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+
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+ /* Process all hash subnodes of the component image node */
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+ fdt_for_each_subnode(noffset, fit, image_noffset) {
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+ const char *name = fit_get_name(fit, noffset, NULL);
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+
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+ if (!strncmp(name, FIT_SIG_NODENAME,
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+ strlen(FIT_SIG_NODENAME))) {
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+ ret = fit_image_check_sig(fit, noffset, data,
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+ size, -1, &err_msg);
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+ if (ret) {
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+ puts("- ");
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+ } else {
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+ puts("+ ");
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+ verified = 1;
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+ break;
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+ }
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+ }
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+ }
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+
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+ if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
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+ err_msg = "Corrupted or truncated tree";
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+ goto error;
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+ }
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+
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+ return verified ? 0 : -EPERM;
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+
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+error:
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+ printf(" error!\n%s for '%s' hash node in '%s' image node\n",
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+ err_msg, fit_get_name(fit, noffset, NULL),
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+ fit_get_name(fit, image_noffset, NULL));
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+ return -1;
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+}
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+
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+int fit_image_verify_required_sigs(const void *fit, int image_noffset,
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+ const char *data, size_t size,
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+ const void *sig_blob, int *no_sigsp)
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+{
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+ int verify_count = 0;
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+ int noffset;
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+ int sig_node;
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+
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+ /* Work out what we need to verify */
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+ *no_sigsp = 1;
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+ sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
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+ if (sig_node < 0) {
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+ debug("%s: No signature node found: %s\n", __func__,
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+ fdt_strerror(sig_node));
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+ return 0;
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+ }
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+
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+ fdt_for_each_subnode(noffset, sig_blob, sig_node) {
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+ const char *required;
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+ int ret;
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+
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+ required = fdt_getprop(sig_blob, noffset, "required", NULL);
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+ if (!required || strcmp(required, "image"))
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+ continue;
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+ ret = fit_image_verify_sig(fit, image_noffset, data, size,
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+ sig_blob, noffset);
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+ if (ret) {
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+ printf("Failed to verify required signature '%s'\n",
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+ fit_get_name(sig_blob, noffset, NULL));
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+ return ret;
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+ }
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+ verify_count++;
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+ }
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+
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+ if (verify_count)
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+ *no_sigsp = 0;
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+
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+ return 0;
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+}
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+
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+int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
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+ char **err_msgp)
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+{
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+ char * const exc_prop[] = {"data"};
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+ const char *prop, *end, *name;
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+ struct image_sign_info info;
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+ const uint32_t *strings;
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+ uint8_t *fit_value;
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+ int fit_value_len;
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+ int max_regions;
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+ int i, prop_len;
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+ char path[200];
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+ int count;
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+
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+ debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
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+ fit_get_name(fit, noffset, NULL),
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+ fit_get_name(gd_fdt_blob(), required_keynode, NULL));
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+ *err_msgp = NULL;
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+ if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
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+ err_msgp))
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+ return -1;
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+
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+ if (fit_image_hash_get_value(fit, noffset, &fit_value,
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+ &fit_value_len)) {
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+ *err_msgp = "Can't get hash value property";
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+ return -1;
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+ }
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+
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+ /* Count the number of strings in the property */
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+ prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
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+ end = prop ? prop + prop_len : prop;
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+ for (name = prop, count = 0; name < end; name++)
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+ if (!*name)
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+ count++;
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+ if (!count) {
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+ *err_msgp = "Can't get hashed-nodes property";
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+ return -1;
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+ }
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+
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+ if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
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+ *err_msgp = "hashed-nodes property must be null-terminated";
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+ return -1;
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+ }
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+
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+ /* Add a sanity check here since we are using the stack */
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+ if (count > IMAGE_MAX_HASHED_NODES) {
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+ *err_msgp = "Number of hashed nodes exceeds maximum";
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+ return -1;
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+ }
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+
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+ /* Create a list of node names from those strings */
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+ char *node_inc[count];
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+
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+ debug("Hash nodes (%d):\n", count);
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+ for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
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+ debug(" '%s'\n", name);
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+ node_inc[i] = (char *)name;
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+ }
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+
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+ /*
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+ * Each node can generate one region for each sub-node. Allow for
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+ * 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
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+ */
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+ max_regions = 20 + count * 7;
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+ struct fdt_region fdt_regions[max_regions];
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+
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+ /* Get a list of regions to hash */
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+ count = fdt_find_regions(fit, node_inc, count,
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+ exc_prop, ARRAY_SIZE(exc_prop),
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+ fdt_regions, max_regions - 1,
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+ path, sizeof(path), 0);
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+ if (count < 0) {
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+ *err_msgp = "Failed to hash configuration";
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+ return -1;
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+ }
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+ if (count == 0) {
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+ *err_msgp = "No data to hash";
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+ return -1;
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+ }
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+ if (count >= max_regions - 1) {
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+ *err_msgp = "Too many hash regions";
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+ return -1;
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+ }
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+
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+ /* Add the strings */
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+ strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
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+ if (strings) {
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+ /*
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+ * The strings region offset must be a static 0x0.
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+ * This is set in tool/image-host.c
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+ */
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+ fdt_regions[count].offset = fdt_off_dt_strings(fit);
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+ fdt_regions[count].size = fdt32_to_cpu(strings[1]);
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+ count++;
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+ }
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+
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+ /* Allocate the region list on the stack */
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+ struct image_region region[count];
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+
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+ fit_region_make_list(fit, fdt_regions, count, region);
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+ if (info.crypto->verify(&info, region, count, fit_value,
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+ fit_value_len)) {
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+ *err_msgp = "Verification failed";
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+ return -1;
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+ }
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+
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+ return 0;
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+}
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+
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+static int fit_config_verify_sig(const void *fit, int conf_noffset,
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+ const void *sig_blob, int sig_offset)
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+{
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+ int noffset;
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+ char *err_msg = "";
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+ int verified = 0;
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+ int ret;
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+
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+ /* Process all hash subnodes of the component conf node */
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+ fdt_for_each_subnode(noffset, fit, conf_noffset) {
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+ const char *name = fit_get_name(fit, noffset, NULL);
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+
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+ if (!strncmp(name, FIT_SIG_NODENAME,
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+ strlen(FIT_SIG_NODENAME))) {
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+ ret = fit_config_check_sig(fit, noffset, sig_offset,
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+ &err_msg);
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+ if (ret) {
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+ puts("- ");
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+ } else {
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+ puts("+ ");
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+ verified = 1;
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+ break;
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+ }
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+ }
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+ }
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+
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+ if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
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+ err_msg = "Corrupted or truncated tree";
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+ goto error;
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+ }
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+
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+ return verified ? 0 : -EPERM;
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+
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+error:
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+ printf(" error!\n%s for '%s' hash node in '%s' config node\n",
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+ err_msg, fit_get_name(fit, noffset, NULL),
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+ fit_get_name(fit, conf_noffset, NULL));
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+ return -1;
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+}
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+
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+int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
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+ const void *sig_blob)
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+{
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+ int noffset;
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+ int sig_node;
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+
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+ /* Work out what we need to verify */
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+ sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
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+ if (sig_node < 0) {
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+ debug("%s: No signature node found: %s\n", __func__,
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+ fdt_strerror(sig_node));
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+ return 0;
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+ }
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+
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+ fdt_for_each_subnode(noffset, sig_blob, sig_node) {
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+ const char *required;
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+ int ret;
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+
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+ required = fdt_getprop(sig_blob, noffset, "required", NULL);
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+ if (!required || strcmp(required, "conf"))
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+ continue;
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+ ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
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+ noffset);
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+ if (ret) {
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+ printf("Failed to verify required signature '%s'\n",
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+ fit_get_name(sig_blob, noffset, NULL));
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+ return ret;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+int fit_config_verify(const void *fit, int conf_noffset)
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+{
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+ return fit_config_verify_required_sigs(fit, conf_noffset,
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+ gd_fdt_blob());
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+}
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