diff options
Diffstat (limited to 'tools/image-host.c')
| -rw-r--r-- | tools/image-host.c | 527 |
1 files changed, 516 insertions, 11 deletions
diff --git a/tools/image-host.c b/tools/image-host.c index d944d0ff4..932384bea 100644 --- a/tools/image-host.c +++ b/tools/image-host.c @@ -26,12 +26,8 @@ */ #include "mkimage.h" -#include <bootstage.h> #include <image.h> -#include <sha1.h> -#include <time.h> -#include <u-boot/crc.h> -#include <u-boot/md5.h> +#include <version.h> /** * fit_set_hash_value - set hash value in requested has node @@ -108,9 +104,165 @@ static int fit_image_process_hash(void *fit, const char *image_name, } /** - * fit_image_add_verification_data() - calculate/set hash data for image node + * fit_image_write_sig() - write the signature to a FIT * - * This adds hash values for a component image node. + * This writes the signature and signer data to the FIT. + * + * @fit: pointer to the FIT format image header + * @noffset: hash node offset + * @value: signature value to be set + * @value_len: signature value length + * @comment: Text comment to write (NULL for none) + * + * returns + * 0, on success + * -FDT_ERR_..., on failure + */ +static int fit_image_write_sig(void *fit, int noffset, uint8_t *value, + int value_len, const char *comment, const char *region_prop, + int region_proplen) +{ + int string_size; + int ret; + + /* + * Get the current string size, before we update the FIT and add + * more + */ + string_size = fdt_size_dt_strings(fit); + + ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); + if (!ret) { + ret = fdt_setprop_string(fit, noffset, "signer-name", + "mkimage"); + } + if (!ret) { + ret = fdt_setprop_string(fit, noffset, "signer-version", + PLAIN_VERSION); + } + if (comment && !ret) + ret = fdt_setprop_string(fit, noffset, "comment", comment); + if (!ret) + ret = fit_set_timestamp(fit, noffset, time(NULL)); + if (region_prop && !ret) { + uint32_t strdata[2]; + + ret = fdt_setprop(fit, noffset, "hashed-nodes", + region_prop, region_proplen); + strdata[0] = 0; + strdata[1] = cpu_to_fdt32(string_size); + if (!ret) { + ret = fdt_setprop(fit, noffset, "hashed-strings", + strdata, sizeof(strdata)); + } + } + + return ret; +} + +static int fit_image_setup_sig(struct image_sign_info *info, + const char *keydir, void *fit, const char *image_name, + int noffset, const char *require_keys) +{ + const char *node_name; + char *algo_name; + + node_name = fit_get_name(fit, noffset, NULL); + if (fit_image_hash_get_algo(fit, noffset, &algo_name)) { + printf("Can't get algo property for '%s' signature node in '%s' image node\n", + node_name, image_name); + return -1; + } + + memset(info, '\0', sizeof(*info)); + info->keydir = keydir; + info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); + info->fit = fit; + info->node_offset = noffset; + info->algo = image_get_sig_algo(algo_name); + info->require_keys = require_keys; + if (!info->algo) { + printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n", + algo_name, node_name, image_name); + return -1; + } + + return 0; +} + +/** + * fit_image_process_sig- Process a single subnode of the images/ node + * + * Check each subnode and process accordingly. For signature nodes we + * generate a signed hash of the supplised data and store it in the node. + * + * @keydir: Directory containing keys to use for signing + * @keydest: Destination FDT blob to write public keys into + * @fit: pointer to the FIT format image header + * @image_name: name of image being processes (used to display errors) + * @noffset: subnode offset + * @data: data to process + * @size: size of data in bytes + * @comment: Comment to add to signature nodes + * @require_keys: Mark all keys as 'required' + * @return 0 if ok, -1 on error + */ +static int fit_image_process_sig(const char *keydir, void *keydest, + void *fit, const char *image_name, + int noffset, const void *data, size_t size, + const char *comment, int require_keys) +{ + struct image_sign_info info; + struct image_region region; + const char *node_name; + uint8_t *value; + uint value_len; + int ret; + + if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset, + require_keys ? "image" : NULL)) + return -1; + + node_name = fit_get_name(fit, noffset, NULL); + region.data = data; + region.size = size; + ret = info.algo->sign(&info, ®ion, 1, &value, &value_len); + if (ret) { + printf("Failed to sign '%s' signature node in '%s' image node: %d\n", + node_name, image_name, ret); + + /* We allow keys to be missing */ + if (ret == -ENOENT) + return 0; + return -1; + } + + ret = fit_image_write_sig(fit, noffset, value, value_len, comment, + NULL, 0); + if (ret) { + printf("Can't write signature for '%s' signature node in '%s' image node: %s\n", + node_name, image_name, fdt_strerror(ret)); + return -1; + } + free(value); + + /* Get keyname again, as FDT has changed and invalidated our pointer */ + info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); + + /* Write the public key into the supplied FDT file */ + if (keydest && info.algo->add_verify_data(&info, keydest)) { + printf("Failed to add verification data for '%s' signature node in '%s' image node\n", + node_name, image_name); + return -1; + } + + return 0; +} + +/** + * fit_image_add_verification_data() - calculate/set verig. data for image node + * + * This adds hash and signature values for an component image node. * * All existing hash subnodes are checked, if algorithm property is set to * one of the supported hash algorithms, hash value is computed and @@ -133,11 +285,17 @@ static int fit_image_process_hash(void *fit, const char *image_name, * * For signature details, please see doc/uImage.FIT/signature.txt * + * @keydir Directory containing *.key and *.crt files (or NULL) + * @keydest FDT Blob to write public keys into (NULL if none) * @fit: Pointer to the FIT format image header * @image_noffset: Requested component image node + * @comment: Comment to add to signature nodes + * @require_keys: Mark all keys as 'required' * @return: 0 on success, <0 on failure */ -int fit_image_add_verification_data(void *fit, int image_noffset) +int fit_image_add_verification_data(const char *keydir, void *keydest, + void *fit, int image_noffset, const char *comment, + int require_keys) { const char *image_name; const void *data; @@ -169,6 +327,12 @@ int fit_image_add_verification_data(void *fit, int image_noffset) strlen(FIT_HASH_NODENAME))) { ret = fit_image_process_hash(fit, image_name, noffset, data, size); + } else if (IMAGE_ENABLE_SIGN && keydir && + !strncmp(node_name, FIT_SIG_NODENAME, + strlen(FIT_SIG_NODENAME))) { + ret = fit_image_process_sig(keydir, keydest, + fit, image_name, noffset, data, size, + comment, require_keys); } if (ret) return -1; @@ -177,9 +341,326 @@ int fit_image_add_verification_data(void *fit, int image_noffset) return 0; } -int fit_add_verification_data(void *fit) +struct strlist { + int count; + char **strings; +}; + +static void strlist_init(struct strlist *list) +{ + memset(list, '\0', sizeof(*list)); +} + +static void strlist_free(struct strlist *list) +{ + int i; + + for (i = 0; i < list->count; i++) + free(list->strings[i]); + free(list->strings); +} + +static int strlist_add(struct strlist *list, const char *str) +{ + char *dup; + + dup = strdup(str); + list->strings = realloc(list->strings, + (list->count + 1) * sizeof(char *)); + if (!list || !str) + return -1; + list->strings[list->count++] = dup; + + return 0; +} + +static const char *fit_config_get_image_list(void *fit, int noffset, + int *lenp, int *allow_missingp) +{ + static const char default_list[] = FIT_KERNEL_PROP "\0" + FIT_FDT_PROP; + const char *prop; + + /* If there is an "image" property, use that */ + prop = fdt_getprop(fit, noffset, "sign-images", lenp); + if (prop) { + *allow_missingp = 0; + return *lenp ? prop : NULL; + } + + /* Default image list */ + *allow_missingp = 1; + *lenp = sizeof(default_list); + + return default_list; +} + +static int fit_config_get_hash_list(void *fit, int conf_noffset, + int sig_offset, struct strlist *node_inc) +{ + int allow_missing; + const char *prop, *iname, *end; + const char *conf_name, *sig_name; + char name[200], path[200]; + int image_count; + int ret, len; + + conf_name = fit_get_name(fit, conf_noffset, NULL); + sig_name = fit_get_name(fit, sig_offset, NULL); + + /* + * Build a list of nodes we need to hash. We always need the root + * node and the configuration. + */ + strlist_init(node_inc); + snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name); + if (strlist_add(node_inc, "/") || + strlist_add(node_inc, name)) + goto err_mem; + + /* Get a list of images that we intend to sign */ + prop = fit_config_get_image_list(fit, conf_noffset, &len, + &allow_missing); + if (!prop) + return 0; + + /* Locate the images */ + end = prop + len; + image_count = 0; + for (iname = prop; iname < end; iname += strlen(iname) + 1) { + int noffset; + int image_noffset; + int hash_count; + + image_noffset = fit_conf_get_prop_node(fit, conf_noffset, + iname); + if (image_noffset < 0) { + printf("Failed to find image '%s' in configuration '%s/%s'\n", + iname, conf_name, sig_name); + if (allow_missing) + continue; + + return -ENOENT; + } + + ret = fdt_get_path(fit, image_noffset, path, sizeof(path)); + if (ret < 0) + goto err_path; + if (strlist_add(node_inc, path)) + goto err_mem; + + snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, + conf_name); + + /* Add all this image's hashes */ + hash_count = 0; + for (noffset = fdt_first_subnode(fit, image_noffset); + noffset >= 0; + noffset = fdt_next_subnode(fit, noffset)) { + const char *name = fit_get_name(fit, noffset, NULL); + + if (strncmp(name, FIT_HASH_NODENAME, + strlen(FIT_HASH_NODENAME))) + continue; + ret = fdt_get_path(fit, noffset, path, sizeof(path)); + if (ret < 0) + goto err_path; + if (strlist_add(node_inc, path)) + goto err_mem; + hash_count++; + } + + if (!hash_count) { + printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n", + conf_name, sig_name, iname); + return -ENOMSG; + } + + image_count++; + } + + if (!image_count) { + printf("Failed to find any images for configuration '%s/%s'\n", + conf_name, sig_name); + return -ENOMSG; + } + + return 0; + +err_mem: + printf("Out of memory processing configuration '%s/%s'\n", conf_name, + sig_name); + return -ENOMEM; + +err_path: + printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n", + iname, conf_name, sig_name, fdt_strerror(ret)); + return -ENOENT; +} + +static int fit_config_get_data(void *fit, int conf_noffset, int noffset, + struct image_region **regionp, int *region_countp, + char **region_propp, int *region_proplen) { - int images_noffset; + char * const exc_prop[] = {"data"}; + struct strlist node_inc; + struct image_region *region; + struct fdt_region fdt_regions[100]; + const char *conf_name, *sig_name; + char path[200]; + int count, i; + char *region_prop; + int ret, len; + + conf_name = fit_get_name(fit, conf_noffset, NULL); + sig_name = fit_get_name(fit, conf_noffset, NULL); + debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name); + + /* Get a list of nodes we want to hash */ + ret = fit_config_get_hash_list(fit, conf_noffset, noffset, &node_inc); + if (ret) + return ret; + + /* Get a list of regions to hash */ + count = fdt_find_regions(fit, node_inc.strings, node_inc.count, + exc_prop, ARRAY_SIZE(exc_prop), + fdt_regions, ARRAY_SIZE(fdt_regions), + path, sizeof(path), 1); + if (count < 0) { + printf("Failed to hash configuration '%s/%s': %s\n", conf_name, + sig_name, fdt_strerror(ret)); + return -EIO; + } + if (count == 0) { + printf("No data to hash for configuration '%s/%s': %s\n", + conf_name, sig_name, fdt_strerror(ret)); + return -EINVAL; + } + + /* Build our list of data blocks */ + region = fit_region_make_list(fit, fdt_regions, count, NULL); + if (!region) { + printf("Out of memory hashing configuration '%s/%s'\n", + conf_name, sig_name); + return -ENOMEM; + } + + /* Create a list of all hashed properties */ + debug("Hash nodes:\n"); + for (i = len = 0; i < node_inc.count; i++) { + debug(" %s\n", node_inc.strings[i]); + len += strlen(node_inc.strings[i]) + 1; + } + region_prop = malloc(len); + if (!region_prop) { + printf("Out of memory setting up regions for configuration '%s/%s'\n", + conf_name, sig_name); + return -ENOMEM; + } + for (i = len = 0; i < node_inc.count; + len += strlen(node_inc.strings[i]) + 1, i++) + strcpy(region_prop + len, node_inc.strings[i]); + strlist_free(&node_inc); + + *region_countp = count; + *regionp = region; + *region_propp = region_prop; + *region_proplen = len; + + return 0; +} + +static int fit_config_process_sig(const char *keydir, void *keydest, + void *fit, const char *conf_name, int conf_noffset, + int noffset, const char *comment, int require_keys) +{ + struct image_sign_info info; + const char *node_name; + struct image_region *region; + char *region_prop; + int region_proplen; + int region_count; + uint8_t *value; + uint value_len; + int ret; + + node_name = fit_get_name(fit, noffset, NULL); + if (fit_config_get_data(fit, conf_noffset, noffset, ®ion, + ®ion_count, ®ion_prop, ®ion_proplen)) + return -1; + + if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset, + require_keys ? "conf" : NULL)) + return -1; + + ret = info.algo->sign(&info, region, region_count, &value, &value_len); + free(region); + if (ret) { + printf("Failed to sign '%s' signature node in '%s' conf node\n", + node_name, conf_name); + + /* We allow keys to be missing */ + if (ret == -ENOENT) + return 0; + return -1; + } + + if (fit_image_write_sig(fit, noffset, value, value_len, comment, + region_prop, region_proplen)) { + printf("Can't write signature for '%s' signature node in '%s' conf node\n", + node_name, conf_name); + return -1; + } + free(value); + free(region_prop); + + /* Get keyname again, as FDT has changed and invalidated our pointer */ + info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); + + /* Write the public key into the supplied FDT file */ + if (keydest && info.algo->add_verify_data(&info, keydest)) { + printf("Failed to add verification data for '%s' signature node in '%s' image node\n", + node_name, conf_name); + return -1; + } + + return 0; +} + +static int fit_config_add_verification_data(const char *keydir, void *keydest, + void *fit, int conf_noffset, const char *comment, + int require_keys) +{ + const char *conf_name; + int noffset; + + conf_name = fit_get_name(fit, conf_noffset, NULL); + + /* Process all hash subnodes of the configuration node */ + for (noffset = fdt_first_subnode(fit, conf_noffset); + noffset >= 0; + noffset = fdt_next_subnode(fit, noffset)) { + const char *node_name; + int ret = 0; + + node_name = fit_get_name(fit, noffset, NULL); + if (!strncmp(node_name, FIT_SIG_NODENAME, + strlen(FIT_SIG_NODENAME))) { + ret = fit_config_process_sig(keydir, keydest, + fit, conf_name, conf_noffset, noffset, comment, + require_keys); + } + if (ret) + return ret; + } + + return 0; +} + +int fit_add_verification_data(const char *keydir, void *keydest, void *fit, + const char *comment, int require_keys) +{ + int images_noffset, confs_noffset; int noffset; int ret; @@ -199,7 +680,31 @@ int fit_add_verification_data(void *fit) * Direct child node of the images parent node, * i.e. component image node. */ - ret = fit_image_add_verification_data(fit, noffset); + ret = fit_image_add_verification_data(keydir, keydest, + fit, noffset, comment, require_keys); + if (ret) + return ret; + } + + /* If there are no keys, we can't sign configurations */ + if (!IMAGE_ENABLE_SIGN || !keydir) + return 0; + + /* Find configurations parent node offset */ + confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH); + if (confs_noffset < 0) { + printf("Can't find images parent node '%s' (%s)\n", + FIT_IMAGES_PATH, fdt_strerror(confs_noffset)); + return -ENOENT; + } + + /* Process its subnodes, print out component images details */ + for (noffset = fdt_first_subnode(fit, confs_noffset); + noffset >= 0; + noffset = fdt_next_subnode(fit, noffset)) { + ret = fit_config_add_verification_data(keydir, keydest, + fit, noffset, comment, + require_keys); if (ret) return ret; } |