scripts/sign-file.c - kernel/msm-4.9 - Gitiles

 /* 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;
 }
	/* 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;
	}