mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![David Howells](/assets/img/avatar_default.png)
The sign-file.c program actually uses CMS rather than PKCS#7 to sign a file since that allows the target X.509 certificate to be specified by subjectKeyId rather than by issuer + serialNumber. However, older versions of the OpenSSL crypto library (such as may be found in CentOS 5.11) don't support CMS. Assume everything prior to OpenSSL-1.0.0 doesn't support CMS and switch to using PKCS#7 in that case. Further, the pre-1.0.0 OpenSSL only supports PKCS#7 signing with SHA1, so give an error from the sign-file script if the caller requests anything other than SHA1. The compiler gives the following error with an OpenSSL crypto library that's too old: HOSTCC scripts/sign-file scripts/sign-file.c:23:25: fatal error: openssl/cms.h: No such file or directory #include <openssl/cms.h> Reported-by: Vinson Lee <vlee@twopensource.com> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: David Woodhouse <David.Woodhouse@intel.com>
323 lines
8.1 KiB
C
Executable file
323 lines
8.1 KiB
C
Executable file
/* Sign a module file using the given key.
|
|
*
|
|
* Copyright © 2014-2015 Red Hat, Inc. All Rights Reserved.
|
|
* Copyright © 2015 Intel Corporation.
|
|
*
|
|
* Authors: David Howells <dhowells@redhat.com>
|
|
* David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation; either version 2.1
|
|
* of the licence, or (at your option) any later version.
|
|
*/
|
|
#define _GNU_SOURCE
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <getopt.h>
|
|
#include <err.h>
|
|
#include <arpa/inet.h>
|
|
#include <openssl/opensslv.h>
|
|
#include <openssl/bio.h>
|
|
#include <openssl/evp.h>
|
|
#include <openssl/pem.h>
|
|
#include <openssl/err.h>
|
|
#include <openssl/engine.h>
|
|
|
|
/*
|
|
* Use CMS if we have openssl-1.0.0 or newer available - otherwise we have to
|
|
* assume that it's not available and its header file is missing and that we
|
|
* should use PKCS#7 instead. Switching to the older PKCS#7 format restricts
|
|
* the options we have on specifying the X.509 certificate we want.
|
|
*
|
|
* Further, older versions of OpenSSL don't support manually adding signers to
|
|
* the PKCS#7 message so have to accept that we get a certificate included in
|
|
* the signature message. Nor do such older versions of OpenSSL support
|
|
* signing with anything other than SHA1 - so we're stuck with that if such is
|
|
* the case.
|
|
*/
|
|
#if OPENSSL_VERSION_NUMBER < 0x10000000L
|
|
#define USE_PKCS7
|
|
#endif
|
|
#ifndef USE_PKCS7
|
|
#include <openssl/cms.h>
|
|
#else
|
|
#include <openssl/pkcs7.h>
|
|
#endif
|
|
|
|
struct module_signature {
|
|
uint8_t algo; /* Public-key crypto algorithm [0] */
|
|
uint8_t hash; /* Digest algorithm [0] */
|
|
uint8_t id_type; /* Key identifier type [PKEY_ID_PKCS7] */
|
|
uint8_t signer_len; /* Length of signer's name [0] */
|
|
uint8_t key_id_len; /* Length of key identifier [0] */
|
|
uint8_t __pad[3];
|
|
uint32_t sig_len; /* Length of signature data */
|
|
};
|
|
|
|
#define PKEY_ID_PKCS7 2
|
|
|
|
static char magic_number[] = "~Module signature appended~\n";
|
|
|
|
static __attribute__((noreturn))
|
|
void format(void)
|
|
{
|
|
fprintf(stderr,
|
|
"Usage: scripts/sign-file [-dp] <hash algo> <key> <x509> <module> [<dest>]\n");
|
|
exit(2);
|
|
}
|
|
|
|
static void display_openssl_errors(int l)
|
|
{
|
|
const char *file;
|
|
char buf[120];
|
|
int e, line;
|
|
|
|
if (ERR_peek_error() == 0)
|
|
return;
|
|
fprintf(stderr, "At main.c:%d:\n", l);
|
|
|
|
while ((e = ERR_get_error_line(&file, &line))) {
|
|
ERR_error_string(e, buf);
|
|
fprintf(stderr, "- SSL %s: %s:%d\n", buf, file, line);
|
|
}
|
|
}
|
|
|
|
static void drain_openssl_errors(void)
|
|
{
|
|
const char *file;
|
|
int line;
|
|
|
|
if (ERR_peek_error() == 0)
|
|
return;
|
|
while (ERR_get_error_line(&file, &line)) {}
|
|
}
|
|
|
|
#define ERR(cond, fmt, ...) \
|
|
do { \
|
|
bool __cond = (cond); \
|
|
display_openssl_errors(__LINE__); \
|
|
if (__cond) { \
|
|
err(1, fmt, ## __VA_ARGS__); \
|
|
} \
|
|
} while(0)
|
|
|
|
static const char *key_pass;
|
|
|
|
static int pem_pw_cb(char *buf, int len, int w, void *v)
|
|
{
|
|
int pwlen;
|
|
|
|
if (!key_pass)
|
|
return -1;
|
|
|
|
pwlen = strlen(key_pass);
|
|
if (pwlen >= len)
|
|
return -1;
|
|
|
|
strcpy(buf, key_pass);
|
|
|
|
/* If it's wrong, don't keep trying it. */
|
|
key_pass = NULL;
|
|
|
|
return pwlen;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct module_signature sig_info = { .id_type = PKEY_ID_PKCS7 };
|
|
char *hash_algo = NULL;
|
|
char *private_key_name, *x509_name, *module_name, *dest_name;
|
|
bool save_sig = false, replace_orig;
|
|
bool sign_only = false;
|
|
unsigned char buf[4096];
|
|
unsigned long module_size, sig_size;
|
|
unsigned int use_signed_attrs;
|
|
const EVP_MD *digest_algo;
|
|
EVP_PKEY *private_key;
|
|
#ifndef USE_PKCS7
|
|
CMS_ContentInfo *cms;
|
|
unsigned int use_keyid = 0;
|
|
#else
|
|
PKCS7 *pkcs7;
|
|
#endif
|
|
X509 *x509;
|
|
BIO *b, *bd = NULL, *bm;
|
|
int opt, n;
|
|
OpenSSL_add_all_algorithms();
|
|
ERR_load_crypto_strings();
|
|
ERR_clear_error();
|
|
|
|
key_pass = getenv("KBUILD_SIGN_PIN");
|
|
|
|
#ifndef USE_PKCS7
|
|
use_signed_attrs = CMS_NOATTR;
|
|
#else
|
|
use_signed_attrs = PKCS7_NOATTR;
|
|
#endif
|
|
|
|
do {
|
|
opt = getopt(argc, argv, "dpk");
|
|
switch (opt) {
|
|
case 'p': save_sig = true; break;
|
|
case 'd': sign_only = true; save_sig = true; break;
|
|
#ifndef USE_PKCS7
|
|
case 'k': use_keyid = CMS_USE_KEYID; break;
|
|
#endif
|
|
case -1: break;
|
|
default: format();
|
|
}
|
|
} while (opt != -1);
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc < 4 || argc > 5)
|
|
format();
|
|
|
|
hash_algo = argv[0];
|
|
private_key_name = argv[1];
|
|
x509_name = argv[2];
|
|
module_name = argv[3];
|
|
if (argc == 5) {
|
|
dest_name = argv[4];
|
|
replace_orig = false;
|
|
} else {
|
|
ERR(asprintf(&dest_name, "%s.~signed~", module_name) < 0,
|
|
"asprintf");
|
|
replace_orig = true;
|
|
}
|
|
|
|
#ifdef USE_PKCS7
|
|
if (strcmp(hash_algo, "sha1") != 0) {
|
|
fprintf(stderr, "sign-file: %s only supports SHA1 signing\n",
|
|
OPENSSL_VERSION_TEXT);
|
|
exit(3);
|
|
}
|
|
#endif
|
|
|
|
/* Read the private key and the X.509 cert the PKCS#7 message
|
|
* will point to.
|
|
*/
|
|
if (!strncmp(private_key_name, "pkcs11:", 7)) {
|
|
ENGINE *e;
|
|
|
|
ENGINE_load_builtin_engines();
|
|
drain_openssl_errors();
|
|
e = ENGINE_by_id("pkcs11");
|
|
ERR(!e, "Load PKCS#11 ENGINE");
|
|
if (ENGINE_init(e))
|
|
drain_openssl_errors();
|
|
else
|
|
ERR(1, "ENGINE_init");
|
|
if (key_pass)
|
|
ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
|
|
private_key = ENGINE_load_private_key(e, private_key_name, NULL,
|
|
NULL);
|
|
ERR(!private_key, "%s", private_key_name);
|
|
} else {
|
|
b = BIO_new_file(private_key_name, "rb");
|
|
ERR(!b, "%s", private_key_name);
|
|
private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb, NULL);
|
|
ERR(!private_key, "%s", private_key_name);
|
|
BIO_free(b);
|
|
}
|
|
|
|
b = BIO_new_file(x509_name, "rb");
|
|
ERR(!b, "%s", x509_name);
|
|
x509 = d2i_X509_bio(b, NULL); /* Binary encoded X.509 */
|
|
if (!x509) {
|
|
ERR(BIO_reset(b) != 1, "%s", x509_name);
|
|
x509 = PEM_read_bio_X509(b, NULL, NULL, NULL); /* PEM encoded X.509 */
|
|
if (x509)
|
|
drain_openssl_errors();
|
|
}
|
|
BIO_free(b);
|
|
ERR(!x509, "%s", x509_name);
|
|
|
|
/* Open the destination file now so that we can shovel the module data
|
|
* across as we read it.
|
|
*/
|
|
if (!sign_only) {
|
|
bd = BIO_new_file(dest_name, "wb");
|
|
ERR(!bd, "%s", dest_name);
|
|
}
|
|
|
|
/* Digest the module data. */
|
|
OpenSSL_add_all_digests();
|
|
display_openssl_errors(__LINE__);
|
|
digest_algo = EVP_get_digestbyname(hash_algo);
|
|
ERR(!digest_algo, "EVP_get_digestbyname");
|
|
|
|
bm = BIO_new_file(module_name, "rb");
|
|
ERR(!bm, "%s", module_name);
|
|
|
|
#ifndef USE_PKCS7
|
|
/* Load the signature message from the digest buffer. */
|
|
cms = CMS_sign(NULL, NULL, NULL, NULL,
|
|
CMS_NOCERTS | CMS_PARTIAL | CMS_BINARY | CMS_DETACHED | CMS_STREAM);
|
|
ERR(!cms, "CMS_sign");
|
|
|
|
ERR(!CMS_add1_signer(cms, x509, private_key, digest_algo,
|
|
CMS_NOCERTS | CMS_BINARY | CMS_NOSMIMECAP |
|
|
use_keyid | use_signed_attrs),
|
|
"CMS_add1_signer");
|
|
ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) < 0,
|
|
"CMS_final");
|
|
|
|
#else
|
|
pkcs7 = PKCS7_sign(x509, private_key, NULL, bm,
|
|
PKCS7_NOCERTS | PKCS7_BINARY |
|
|
PKCS7_DETACHED | use_signed_attrs);
|
|
ERR(!pkcs7, "PKCS7_sign");
|
|
#endif
|
|
|
|
if (save_sig) {
|
|
char *sig_file_name;
|
|
|
|
ERR(asprintf(&sig_file_name, "%s.p7s", module_name) < 0,
|
|
"asprintf");
|
|
b = BIO_new_file(sig_file_name, "wb");
|
|
ERR(!b, "%s", sig_file_name);
|
|
#ifndef USE_PKCS7
|
|
ERR(i2d_CMS_bio_stream(b, cms, NULL, 0) < 0,
|
|
"%s", sig_file_name);
|
|
#else
|
|
ERR(i2d_PKCS7_bio(b, pkcs7) < 0,
|
|
"%s", sig_file_name);
|
|
#endif
|
|
BIO_free(b);
|
|
}
|
|
|
|
if (sign_only)
|
|
return 0;
|
|
|
|
/* Append the marker and the PKCS#7 message to the destination file */
|
|
ERR(BIO_reset(bm) < 0, "%s", module_name);
|
|
while ((n = BIO_read(bm, buf, sizeof(buf))),
|
|
n > 0) {
|
|
ERR(BIO_write(bd, buf, n) < 0, "%s", dest_name);
|
|
}
|
|
ERR(n < 0, "%s", module_name);
|
|
module_size = BIO_number_written(bd);
|
|
|
|
#ifndef USE_PKCS7
|
|
ERR(i2d_CMS_bio_stream(bd, cms, NULL, 0) < 0, "%s", dest_name);
|
|
#else
|
|
ERR(i2d_PKCS7_bio(bd, pkcs7) < 0, "%s", dest_name);
|
|
#endif
|
|
sig_size = BIO_number_written(bd) - module_size;
|
|
sig_info.sig_len = htonl(sig_size);
|
|
ERR(BIO_write(bd, &sig_info, sizeof(sig_info)) < 0, "%s", dest_name);
|
|
ERR(BIO_write(bd, magic_number, sizeof(magic_number) - 1) < 0, "%s", dest_name);
|
|
|
|
ERR(BIO_free(bd) < 0, "%s", dest_name);
|
|
|
|
/* Finally, if we're signing in place, replace the original. */
|
|
if (replace_orig)
|
|
ERR(rename(dest_name, module_name) < 0, "%s", dest_name);
|
|
|
|
return 0;
|
|
}
|