upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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777 lines
16 KiB
777 lines
16 KiB
// 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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#include "mkimage.h"
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#include <stdio.h>
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#include <string.h>
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#include <image.h>
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#include <time.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/ssl.h>
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#include <openssl/evp.h>
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#include <openssl/engine.h>
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#if OPENSSL_VERSION_NUMBER >= 0x10000000L
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#define HAVE_ERR_REMOVE_THREAD_STATE
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#endif
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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static void RSA_get0_key(const RSA *r,
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const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
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{
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if (n != NULL)
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*n = r->n;
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if (e != NULL)
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*e = r->e;
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if (d != NULL)
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*d = r->d;
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}
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#endif
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static int rsa_err(const char *msg)
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{
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unsigned long sslErr = ERR_get_error();
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fprintf(stderr, "%s", msg);
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fprintf(stderr, ": %s\n",
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ERR_error_string(sslErr, 0));
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return -1;
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}
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/**
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* rsa_pem_get_pub_key() - read a public key from a .crt file
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*
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* @keydir: Directory containins the key
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* @name Name of key file (will have a .crt extension)
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_pem_get_pub_key(const char *keydir, const char *name, RSA **rsap)
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{
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char path[1024];
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EVP_PKEY *key;
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X509 *cert;
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RSA *rsa;
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FILE *f;
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int ret;
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*rsap = NULL;
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snprintf(path, sizeof(path), "%s/%s.crt", keydir, name);
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f = fopen(path, "r");
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if (!f) {
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fprintf(stderr, "Couldn't open RSA certificate: '%s': %s\n",
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path, strerror(errno));
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return -EACCES;
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}
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/* Read the certificate */
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cert = NULL;
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if (!PEM_read_X509(f, &cert, NULL, NULL)) {
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rsa_err("Couldn't read certificate");
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ret = -EINVAL;
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goto err_cert;
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}
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/* Get the public key from the certificate. */
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key = X509_get_pubkey(cert);
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if (!key) {
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rsa_err("Couldn't read public key\n");
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ret = -EINVAL;
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goto err_pubkey;
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}
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/* Convert to a RSA_style key. */
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rsa = EVP_PKEY_get1_RSA(key);
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if (!rsa) {
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rsa_err("Couldn't convert to a RSA style key");
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ret = -EINVAL;
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goto err_rsa;
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}
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fclose(f);
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EVP_PKEY_free(key);
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X509_free(cert);
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*rsap = rsa;
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return 0;
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err_rsa:
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EVP_PKEY_free(key);
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err_pubkey:
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X509_free(cert);
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err_cert:
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fclose(f);
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return ret;
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}
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/**
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* rsa_engine_get_pub_key() - read a public key from given engine
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*
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* @keydir: Key prefix
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* @name Name of key
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* @engine Engine to use
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_engine_get_pub_key(const char *keydir, const char *name,
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ENGINE *engine, RSA **rsap)
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{
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const char *engine_id;
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char key_id[1024];
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EVP_PKEY *key;
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RSA *rsa;
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int ret;
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*rsap = NULL;
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engine_id = ENGINE_get_id(engine);
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if (engine_id && !strcmp(engine_id, "pkcs11")) {
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if (keydir)
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snprintf(key_id, sizeof(key_id),
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"pkcs11:%s;object=%s;type=public",
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keydir, name);
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else
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snprintf(key_id, sizeof(key_id),
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"pkcs11:object=%s;type=public",
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name);
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} else {
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fprintf(stderr, "Engine not supported\n");
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return -ENOTSUP;
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}
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key = ENGINE_load_public_key(engine, key_id, NULL, NULL);
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if (!key)
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return rsa_err("Failure loading public key from engine");
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/* Convert to a RSA_style key. */
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rsa = EVP_PKEY_get1_RSA(key);
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if (!rsa) {
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rsa_err("Couldn't convert to a RSA style key");
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ret = -EINVAL;
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goto err_rsa;
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}
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EVP_PKEY_free(key);
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*rsap = rsa;
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return 0;
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err_rsa:
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EVP_PKEY_free(key);
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return ret;
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}
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/**
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* rsa_get_pub_key() - read a public key
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*
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* @keydir: Directory containing the key (PEM file) or key prefix (engine)
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* @name Name of key file (will have a .crt extension)
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* @engine Engine to use
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_get_pub_key(const char *keydir, const char *name,
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ENGINE *engine, RSA **rsap)
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{
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if (engine)
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return rsa_engine_get_pub_key(keydir, name, engine, rsap);
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return rsa_pem_get_pub_key(keydir, name, rsap);
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}
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/**
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* rsa_pem_get_priv_key() - read a private key from a .key file
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*
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* @keydir: Directory containing the key
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* @name Name of key file (will have a .key extension)
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_pem_get_priv_key(const char *keydir, const char *name,
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RSA **rsap)
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{
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char path[1024];
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RSA *rsa;
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FILE *f;
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*rsap = NULL;
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snprintf(path, sizeof(path), "%s/%s.key", keydir, name);
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f = fopen(path, "r");
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if (!f) {
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fprintf(stderr, "Couldn't open RSA private key: '%s': %s\n",
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path, strerror(errno));
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return -ENOENT;
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}
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rsa = PEM_read_RSAPrivateKey(f, 0, NULL, path);
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if (!rsa) {
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rsa_err("Failure reading private key");
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fclose(f);
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return -EPROTO;
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}
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fclose(f);
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*rsap = rsa;
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return 0;
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}
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/**
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* rsa_engine_get_priv_key() - read a private key from given engine
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*
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* @keydir: Key prefix
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* @name Name of key
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* @engine Engine to use
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_engine_get_priv_key(const char *keydir, const char *name,
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ENGINE *engine, RSA **rsap)
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{
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const char *engine_id;
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char key_id[1024];
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EVP_PKEY *key;
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RSA *rsa;
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int ret;
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*rsap = NULL;
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engine_id = ENGINE_get_id(engine);
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if (engine_id && !strcmp(engine_id, "pkcs11")) {
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if (keydir)
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snprintf(key_id, sizeof(key_id),
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"pkcs11:%s;object=%s;type=private",
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keydir, name);
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else
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snprintf(key_id, sizeof(key_id),
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"pkcs11:object=%s;type=private",
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name);
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} else {
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fprintf(stderr, "Engine not supported\n");
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return -ENOTSUP;
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}
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key = ENGINE_load_private_key(engine, key_id, NULL, NULL);
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if (!key)
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return rsa_err("Failure loading private key from engine");
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/* Convert to a RSA_style key. */
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rsa = EVP_PKEY_get1_RSA(key);
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if (!rsa) {
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rsa_err("Couldn't convert to a RSA style key");
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ret = -EINVAL;
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goto err_rsa;
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}
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EVP_PKEY_free(key);
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*rsap = rsa;
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return 0;
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err_rsa:
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EVP_PKEY_free(key);
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return ret;
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}
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/**
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* rsa_get_priv_key() - read a private key
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*
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* @keydir: Directory containing the key (PEM file) or key prefix (engine)
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* @name Name of key
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* @engine Engine to use for signing
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* @rsap Returns RSA object, or NULL on failure
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* @return 0 if ok, -ve on error (in which case *rsap will be set to NULL)
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*/
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static int rsa_get_priv_key(const char *keydir, const char *name,
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ENGINE *engine, RSA **rsap)
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{
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if (engine)
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return rsa_engine_get_priv_key(keydir, name, engine, rsap);
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return rsa_pem_get_priv_key(keydir, name, rsap);
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}
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static int rsa_init(void)
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{
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int ret;
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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ret = SSL_library_init();
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#else
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ret = OPENSSL_init_ssl(0, NULL);
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#endif
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if (!ret) {
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fprintf(stderr, "Failure to init SSL library\n");
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return -1;
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}
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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SSL_load_error_strings();
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OpenSSL_add_all_algorithms();
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OpenSSL_add_all_digests();
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OpenSSL_add_all_ciphers();
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#endif
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return 0;
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}
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static int rsa_engine_init(const char *engine_id, ENGINE **pe)
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{
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ENGINE *e;
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int ret;
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ENGINE_load_builtin_engines();
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e = ENGINE_by_id(engine_id);
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if (!e) {
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fprintf(stderr, "Engine isn't available\n");
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ret = -1;
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goto err_engine_by_id;
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}
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if (!ENGINE_init(e)) {
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fprintf(stderr, "Couldn't initialize engine\n");
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ret = -1;
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goto err_engine_init;
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}
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if (!ENGINE_set_default_RSA(e)) {
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fprintf(stderr, "Couldn't set engine as default for RSA\n");
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ret = -1;
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goto err_set_rsa;
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}
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*pe = e;
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return 0;
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err_set_rsa:
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ENGINE_finish(e);
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err_engine_init:
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ENGINE_free(e);
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err_engine_by_id:
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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ENGINE_cleanup();
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#endif
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return ret;
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}
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static void rsa_remove(void)
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{
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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CRYPTO_cleanup_all_ex_data();
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ERR_free_strings();
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#ifdef HAVE_ERR_REMOVE_THREAD_STATE
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ERR_remove_thread_state(NULL);
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#else
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ERR_remove_state(0);
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#endif
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EVP_cleanup();
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#endif
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}
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static void rsa_engine_remove(ENGINE *e)
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{
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if (e) {
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ENGINE_finish(e);
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ENGINE_free(e);
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}
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}
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static int rsa_sign_with_key(RSA *rsa, struct checksum_algo *checksum_algo,
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const struct image_region region[], int region_count,
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uint8_t **sigp, uint *sig_size)
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{
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EVP_PKEY *key;
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EVP_MD_CTX *context;
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int size, ret = 0;
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uint8_t *sig;
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int i;
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key = EVP_PKEY_new();
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if (!key)
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return rsa_err("EVP_PKEY object creation failed");
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if (!EVP_PKEY_set1_RSA(key, rsa)) {
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ret = rsa_err("EVP key setup failed");
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goto err_set;
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}
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size = EVP_PKEY_size(key);
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sig = malloc(size);
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if (!sig) {
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fprintf(stderr, "Out of memory for signature (%d bytes)\n",
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size);
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ret = -ENOMEM;
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goto err_alloc;
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}
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context = EVP_MD_CTX_create();
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if (!context) {
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ret = rsa_err("EVP context creation failed");
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goto err_create;
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}
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EVP_MD_CTX_init(context);
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if (!EVP_SignInit(context, checksum_algo->calculate_sign())) {
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ret = rsa_err("Signer setup failed");
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goto err_sign;
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}
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for (i = 0; i < region_count; i++) {
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if (!EVP_SignUpdate(context, region[i].data, region[i].size)) {
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ret = rsa_err("Signing data failed");
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goto err_sign;
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}
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}
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if (!EVP_SignFinal(context, sig, sig_size, key)) {
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ret = rsa_err("Could not obtain signature");
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goto err_sign;
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}
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_MD_CTX_cleanup(context);
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#else
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EVP_MD_CTX_reset(context);
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#endif
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EVP_MD_CTX_destroy(context);
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EVP_PKEY_free(key);
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debug("Got signature: %d bytes, expected %d\n", *sig_size, size);
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*sigp = sig;
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*sig_size = size;
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return 0;
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err_sign:
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EVP_MD_CTX_destroy(context);
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err_create:
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free(sig);
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err_alloc:
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err_set:
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EVP_PKEY_free(key);
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return ret;
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}
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int rsa_sign(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t **sigp, uint *sig_len)
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{
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RSA *rsa;
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ENGINE *e = NULL;
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int ret;
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ret = rsa_init();
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if (ret)
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return ret;
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if (info->engine_id) {
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ret = rsa_engine_init(info->engine_id, &e);
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if (ret)
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goto err_engine;
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}
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ret = rsa_get_priv_key(info->keydir, info->keyname, e, &rsa);
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if (ret)
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goto err_priv;
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ret = rsa_sign_with_key(rsa, info->checksum, region,
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region_count, sigp, sig_len);
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if (ret)
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goto err_sign;
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RSA_free(rsa);
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if (info->engine_id)
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rsa_engine_remove(e);
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rsa_remove();
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return ret;
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err_sign:
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RSA_free(rsa);
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err_priv:
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if (info->engine_id)
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rsa_engine_remove(e);
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err_engine:
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rsa_remove();
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return ret;
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}
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|
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/*
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* rsa_get_exponent(): - Get the public exponent from an RSA key
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*/
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static int rsa_get_exponent(RSA *key, uint64_t *e)
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|
{
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int ret;
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BIGNUM *bn_te;
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const BIGNUM *key_e;
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uint64_t te;
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ret = -EINVAL;
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bn_te = NULL;
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if (!e)
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goto cleanup;
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RSA_get0_key(key, NULL, &key_e, NULL);
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if (BN_num_bits(key_e) > 64)
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goto cleanup;
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*e = BN_get_word(key_e);
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if (BN_num_bits(key_e) < 33) {
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ret = 0;
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goto cleanup;
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}
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bn_te = BN_dup(key_e);
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if (!bn_te)
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goto cleanup;
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if (!BN_rshift(bn_te, bn_te, 32))
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goto cleanup;
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if (!BN_mask_bits(bn_te, 32))
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goto cleanup;
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te = BN_get_word(bn_te);
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te <<= 32;
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*e |= te;
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ret = 0;
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cleanup:
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if (bn_te)
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BN_free(bn_te);
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return ret;
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}
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/*
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* rsa_get_params(): - Get the important parameters of an RSA public key
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|
*/
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|
int rsa_get_params(RSA *key, uint64_t *exponent, uint32_t *n0_invp,
|
|
BIGNUM **modulusp, BIGNUM **r_squaredp)
|
|
{
|
|
BIGNUM *big1, *big2, *big32, *big2_32;
|
|
BIGNUM *n, *r, *r_squared, *tmp;
|
|
const BIGNUM *key_n;
|
|
BN_CTX *bn_ctx = BN_CTX_new();
|
|
int ret = 0;
|
|
|
|
/* Initialize BIGNUMs */
|
|
big1 = BN_new();
|
|
big2 = BN_new();
|
|
big32 = BN_new();
|
|
r = BN_new();
|
|
r_squared = BN_new();
|
|
tmp = BN_new();
|
|
big2_32 = BN_new();
|
|
n = BN_new();
|
|
if (!big1 || !big2 || !big32 || !r || !r_squared || !tmp || !big2_32 ||
|
|
!n) {
|
|
fprintf(stderr, "Out of memory (bignum)\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (0 != rsa_get_exponent(key, exponent))
|
|
ret = -1;
|
|
|
|
RSA_get0_key(key, &key_n, NULL, NULL);
|
|
if (!BN_copy(n, key_n) || !BN_set_word(big1, 1L) ||
|
|
!BN_set_word(big2, 2L) || !BN_set_word(big32, 32L))
|
|
ret = -1;
|
|
|
|
/* big2_32 = 2^32 */
|
|
if (!BN_exp(big2_32, big2, big32, bn_ctx))
|
|
ret = -1;
|
|
|
|
/* Calculate n0_inv = -1 / n[0] mod 2^32 */
|
|
if (!BN_mod_inverse(tmp, n, big2_32, bn_ctx) ||
|
|
!BN_sub(tmp, big2_32, tmp))
|
|
ret = -1;
|
|
*n0_invp = BN_get_word(tmp);
|
|
|
|
/* Calculate R = 2^(# of key bits) */
|
|
if (!BN_set_word(tmp, BN_num_bits(n)) ||
|
|
!BN_exp(r, big2, tmp, bn_ctx))
|
|
ret = -1;
|
|
|
|
/* Calculate r_squared = R^2 mod n */
|
|
if (!BN_copy(r_squared, r) ||
|
|
!BN_mul(tmp, r_squared, r, bn_ctx) ||
|
|
!BN_mod(r_squared, tmp, n, bn_ctx))
|
|
ret = -1;
|
|
|
|
*modulusp = n;
|
|
*r_squaredp = r_squared;
|
|
|
|
BN_free(big1);
|
|
BN_free(big2);
|
|
BN_free(big32);
|
|
BN_free(r);
|
|
BN_free(tmp);
|
|
BN_free(big2_32);
|
|
if (ret) {
|
|
fprintf(stderr, "Bignum operations failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fdt_add_bignum(void *blob, int noffset, const char *prop_name,
|
|
BIGNUM *num, int num_bits)
|
|
{
|
|
int nwords = num_bits / 32;
|
|
int size;
|
|
uint32_t *buf, *ptr;
|
|
BIGNUM *tmp, *big2, *big32, *big2_32;
|
|
BN_CTX *ctx;
|
|
int ret;
|
|
|
|
tmp = BN_new();
|
|
big2 = BN_new();
|
|
big32 = BN_new();
|
|
big2_32 = BN_new();
|
|
if (!tmp || !big2 || !big32 || !big2_32) {
|
|
fprintf(stderr, "Out of memory (bignum)\n");
|
|
return -ENOMEM;
|
|
}
|
|
ctx = BN_CTX_new();
|
|
if (!tmp) {
|
|
fprintf(stderr, "Out of memory (bignum context)\n");
|
|
return -ENOMEM;
|
|
}
|
|
BN_set_word(big2, 2L);
|
|
BN_set_word(big32, 32L);
|
|
BN_exp(big2_32, big2, big32, ctx); /* B = 2^32 */
|
|
|
|
size = nwords * sizeof(uint32_t);
|
|
buf = malloc(size);
|
|
if (!buf) {
|
|
fprintf(stderr, "Out of memory (%d bytes)\n", size);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Write out modulus as big endian array of integers */
|
|
for (ptr = buf + nwords - 1; ptr >= buf; ptr--) {
|
|
BN_mod(tmp, num, big2_32, ctx); /* n = N mod B */
|
|
*ptr = cpu_to_fdt32(BN_get_word(tmp));
|
|
BN_rshift(num, num, 32); /* N = N/B */
|
|
}
|
|
|
|
/*
|
|
* We try signing with successively increasing size values, so this
|
|
* might fail several times
|
|
*/
|
|
ret = fdt_setprop(blob, noffset, prop_name, buf, size);
|
|
if (ret)
|
|
return -FDT_ERR_NOSPACE;
|
|
free(buf);
|
|
BN_free(tmp);
|
|
BN_free(big2);
|
|
BN_free(big32);
|
|
BN_free(big2_32);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
|
|
{
|
|
BIGNUM *modulus, *r_squared;
|
|
uint64_t exponent;
|
|
uint32_t n0_inv;
|
|
int parent, node;
|
|
char name[100];
|
|
int ret;
|
|
int bits;
|
|
RSA *rsa;
|
|
ENGINE *e = NULL;
|
|
|
|
debug("%s: Getting verification data\n", __func__);
|
|
if (info->engine_id) {
|
|
ret = rsa_engine_init(info->engine_id, &e);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
ret = rsa_get_pub_key(info->keydir, info->keyname, e, &rsa);
|
|
if (ret)
|
|
goto err_get_pub_key;
|
|
ret = rsa_get_params(rsa, &exponent, &n0_inv, &modulus, &r_squared);
|
|
if (ret)
|
|
goto err_get_params;
|
|
bits = BN_num_bits(modulus);
|
|
parent = fdt_subnode_offset(keydest, 0, FIT_SIG_NODENAME);
|
|
if (parent == -FDT_ERR_NOTFOUND) {
|
|
parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME);
|
|
if (parent < 0) {
|
|
ret = parent;
|
|
if (ret != -FDT_ERR_NOSPACE) {
|
|
fprintf(stderr, "Couldn't create signature node: %s\n",
|
|
fdt_strerror(parent));
|
|
}
|
|
}
|
|
}
|
|
if (ret)
|
|
goto done;
|
|
|
|
/* Either create or overwrite the named key node */
|
|
snprintf(name, sizeof(name), "key-%s", info->keyname);
|
|
node = fdt_subnode_offset(keydest, parent, name);
|
|
if (node == -FDT_ERR_NOTFOUND) {
|
|
node = fdt_add_subnode(keydest, parent, name);
|
|
if (node < 0) {
|
|
ret = node;
|
|
if (ret != -FDT_ERR_NOSPACE) {
|
|
fprintf(stderr, "Could not create key subnode: %s\n",
|
|
fdt_strerror(node));
|
|
}
|
|
}
|
|
} else if (node < 0) {
|
|
fprintf(stderr, "Cannot select keys parent: %s\n",
|
|
fdt_strerror(node));
|
|
ret = node;
|
|
}
|
|
|
|
if (!ret) {
|
|
ret = fdt_setprop_string(keydest, node, "key-name-hint",
|
|
info->keyname);
|
|
}
|
|
if (!ret)
|
|
ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits);
|
|
if (!ret)
|
|
ret = fdt_setprop_u32(keydest, node, "rsa,n0-inverse", n0_inv);
|
|
if (!ret) {
|
|
ret = fdt_setprop_u64(keydest, node, "rsa,exponent", exponent);
|
|
}
|
|
if (!ret) {
|
|
ret = fdt_add_bignum(keydest, node, "rsa,modulus", modulus,
|
|
bits);
|
|
}
|
|
if (!ret) {
|
|
ret = fdt_add_bignum(keydest, node, "rsa,r-squared", r_squared,
|
|
bits);
|
|
}
|
|
if (!ret) {
|
|
ret = fdt_setprop_string(keydest, node, FIT_ALGO_PROP,
|
|
info->name);
|
|
}
|
|
if (!ret && info->require_keys) {
|
|
ret = fdt_setprop_string(keydest, node, "required",
|
|
info->require_keys);
|
|
}
|
|
done:
|
|
BN_free(modulus);
|
|
BN_free(r_squared);
|
|
if (ret)
|
|
ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
|
|
err_get_params:
|
|
RSA_free(rsa);
|
|
err_get_pub_key:
|
|
if (info->engine_id)
|
|
rsa_engine_remove(e);
|
|
|
|
return ret;
|
|
}
|
|
|