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![David Howells](/assets/img/avatar_default.png)
Fix the following warning: scripts/sign-file.c: In function ‘main’: scripts/sign-file.c:188: warning: value computed is not used whereby the result of BIO_ctrl() is cast inside of BIO_reset() to an integer of a different size - which we're not checking but probably should. Reported-by: James Morris <jmorris@namei.org> Signed-off-by: David Howells <dhowells@redhat.com>
260 lines
6.5 KiB
C
Executable file
260 lines
6.5 KiB
C
Executable file
/* Sign a module file using the given key.
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*
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* Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <getopt.h>
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#include <err.h>
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#include <arpa/inet.h>
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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#include <openssl/engine.h>
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struct module_signature {
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uint8_t algo; /* Public-key crypto algorithm [0] */
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uint8_t hash; /* Digest algorithm [0] */
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uint8_t id_type; /* Key identifier type [PKEY_ID_PKCS7] */
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uint8_t signer_len; /* Length of signer's name [0] */
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uint8_t key_id_len; /* Length of key identifier [0] */
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uint8_t __pad[3];
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uint32_t sig_len; /* Length of signature data */
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};
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#define PKEY_ID_PKCS7 2
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static char magic_number[] = "~Module signature appended~\n";
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static __attribute__((noreturn))
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void format(void)
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{
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fprintf(stderr,
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"Usage: scripts/sign-file [-dp] <hash algo> <key> <x509> <module> [<dest>]\n");
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exit(2);
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}
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static void display_openssl_errors(int l)
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{
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const char *file;
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char buf[120];
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int e, line;
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if (ERR_peek_error() == 0)
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return;
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fprintf(stderr, "At main.c:%d:\n", l);
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while ((e = ERR_get_error_line(&file, &line))) {
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ERR_error_string(e, buf);
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fprintf(stderr, "- SSL %s: %s:%d\n", buf, file, line);
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}
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}
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static void drain_openssl_errors(void)
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{
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const char *file;
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int line;
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if (ERR_peek_error() == 0)
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return;
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while (ERR_get_error_line(&file, &line)) {}
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}
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#define ERR(cond, fmt, ...) \
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do { \
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bool __cond = (cond); \
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display_openssl_errors(__LINE__); \
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if (__cond) { \
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err(1, fmt, ## __VA_ARGS__); \
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} \
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} while(0)
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static const char *key_pass;
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static int pem_pw_cb(char *buf, int len, int w, void *v)
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{
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int pwlen;
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if (!key_pass)
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return -1;
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pwlen = strlen(key_pass);
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if (pwlen >= len)
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return -1;
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strcpy(buf, key_pass);
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/* If it's wrong, don't keep trying it. */
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key_pass = NULL;
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return pwlen;
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}
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int main(int argc, char **argv)
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{
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struct module_signature sig_info = { .id_type = PKEY_ID_PKCS7 };
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char *hash_algo = NULL;
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char *private_key_name, *x509_name, *module_name, *dest_name;
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bool save_cms = false, replace_orig;
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bool sign_only = false;
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unsigned char buf[4096];
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unsigned long module_size, cms_size;
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unsigned int use_keyid = 0, use_signed_attrs = CMS_NOATTR;
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const EVP_MD *digest_algo;
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EVP_PKEY *private_key;
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CMS_ContentInfo *cms;
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X509 *x509;
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BIO *b, *bd = NULL, *bm;
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int opt, n;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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ERR_clear_error();
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key_pass = getenv("KBUILD_SIGN_PIN");
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do {
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opt = getopt(argc, argv, "dpk");
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switch (opt) {
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case 'p': save_cms = true; break;
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case 'd': sign_only = true; save_cms = true; break;
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case 'k': use_keyid = CMS_USE_KEYID; break;
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case -1: break;
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default: format();
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}
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} while (opt != -1);
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argc -= optind;
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argv += optind;
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if (argc < 4 || argc > 5)
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format();
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hash_algo = argv[0];
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private_key_name = argv[1];
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x509_name = argv[2];
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module_name = argv[3];
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if (argc == 5) {
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dest_name = argv[4];
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replace_orig = false;
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} else {
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ERR(asprintf(&dest_name, "%s.~signed~", module_name) < 0,
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"asprintf");
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replace_orig = true;
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}
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/* Read the private key and the X.509 cert the PKCS#7 message
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* will point to.
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*/
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if (!strncmp(private_key_name, "pkcs11:", 7)) {
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ENGINE *e;
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ENGINE_load_builtin_engines();
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drain_openssl_errors();
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e = ENGINE_by_id("pkcs11");
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ERR(!e, "Load PKCS#11 ENGINE");
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if (ENGINE_init(e))
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drain_openssl_errors();
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else
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ERR(1, "ENGINE_init");
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if (key_pass)
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ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
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private_key = ENGINE_load_private_key(e, private_key_name, NULL,
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NULL);
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ERR(!private_key, "%s", private_key_name);
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} else {
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b = BIO_new_file(private_key_name, "rb");
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ERR(!b, "%s", private_key_name);
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private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb, NULL);
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ERR(!private_key, "%s", private_key_name);
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BIO_free(b);
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}
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b = BIO_new_file(x509_name, "rb");
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ERR(!b, "%s", x509_name);
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x509 = d2i_X509_bio(b, NULL); /* Binary encoded X.509 */
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if (!x509) {
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ERR(BIO_reset(b) != 1, "%s", x509_name);
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x509 = PEM_read_bio_X509(b, NULL, NULL, NULL); /* PEM encoded X.509 */
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if (x509)
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drain_openssl_errors();
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}
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BIO_free(b);
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ERR(!x509, "%s", x509_name);
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/* Open the destination file now so that we can shovel the module data
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* across as we read it.
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*/
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if (!sign_only) {
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bd = BIO_new_file(dest_name, "wb");
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ERR(!bd, "%s", dest_name);
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}
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/* Digest the module data. */
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OpenSSL_add_all_digests();
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display_openssl_errors(__LINE__);
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digest_algo = EVP_get_digestbyname(hash_algo);
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ERR(!digest_algo, "EVP_get_digestbyname");
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bm = BIO_new_file(module_name, "rb");
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ERR(!bm, "%s", module_name);
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/* Load the CMS message from the digest buffer. */
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cms = CMS_sign(NULL, NULL, NULL, NULL,
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CMS_NOCERTS | CMS_PARTIAL | CMS_BINARY | CMS_DETACHED | CMS_STREAM);
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ERR(!cms, "CMS_sign");
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ERR(!CMS_add1_signer(cms, x509, private_key, digest_algo,
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CMS_NOCERTS | CMS_BINARY | CMS_NOSMIMECAP |
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use_keyid | use_signed_attrs),
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"CMS_sign_add_signer");
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ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) < 0,
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"CMS_final");
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if (save_cms) {
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char *cms_name;
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ERR(asprintf(&cms_name, "%s.p7s", module_name) < 0, "asprintf");
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b = BIO_new_file(cms_name, "wb");
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ERR(!b, "%s", cms_name);
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ERR(i2d_CMS_bio_stream(b, cms, NULL, 0) < 0, "%s", cms_name);
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BIO_free(b);
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}
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if (sign_only)
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return 0;
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/* Append the marker and the PKCS#7 message to the destination file */
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ERR(BIO_reset(bm) < 0, "%s", module_name);
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while ((n = BIO_read(bm, buf, sizeof(buf))),
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n > 0) {
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ERR(BIO_write(bd, buf, n) < 0, "%s", dest_name);
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}
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ERR(n < 0, "%s", module_name);
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module_size = BIO_number_written(bd);
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ERR(i2d_CMS_bio_stream(bd, cms, NULL, 0) < 0, "%s", dest_name);
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cms_size = BIO_number_written(bd) - module_size;
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sig_info.sig_len = htonl(cms_size);
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ERR(BIO_write(bd, &sig_info, sizeof(sig_info)) < 0, "%s", dest_name);
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ERR(BIO_write(bd, magic_number, sizeof(magic_number) - 1) < 0, "%s", dest_name);
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ERR(BIO_free(bd) < 0, "%s", dest_name);
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/* Finally, if we're signing in place, replace the original. */
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if (replace_orig)
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ERR(rename(dest_name, module_name) < 0, "%s", dest_name);
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return 0;
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}
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