/* Extract X.509 certificate in DER form from PKCS#11 or PEM. * * 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 <err.h>#include <openssl/bio.h>#include <openssl/pem.h>#include <openssl/err.h>#include <openssl/engine.h> #define PKEY_ID_PKCS7 2 static __attribute__((noreturn))void format(void){	fprintf(stderr,		"Usage: scripts/extract-cert <source> <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 BIO *wb;static char *cert_dst;int kbuild_verbose; static void write_cert(X509 *x509){	char buf[200]; 	if (!wb) {		wb = BIO_new_file(cert_dst, "wb");		ERR(!wb, "%s", cert_dst);	}	X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));	ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst);	if (kbuild_verbose)		fprintf(stderr, "Extracted cert: %s\n", buf);} int main(int argc, char **argv){	char *cert_src; 	OpenSSL_add_all_algorithms();	ERR_load_crypto_strings();	ERR_clear_error(); 	kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0");         key_pass = getenv("KBUILD_SIGN_PIN"); 	if (argc != 3)		format(); 	cert_src = argv[1];	cert_dst = argv[2]; 	if (!cert_src[0]) {		/* Invoked with no input; create empty file */		FILE *f = fopen(cert_dst, "wb");		ERR(!f, "%s", cert_dst);		fclose(f);		exit(0);	} else if (!strncmp(cert_src, "pkcs11:", 7)) {		ENGINE *e;		struct {			const char *cert_id;			X509 *cert;		} parms; 		parms.cert_id = cert_src;		parms.cert = NULL; 		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");		ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);		ERR(!parms.cert, "Get X.509 from PKCS#11");		write_cert(parms.cert);	} else {		BIO *b;		X509 *x509; 		b = BIO_new_file(cert_src, "rb");		ERR(!b, "%s", cert_src); 		while (1) {			x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);			if (wb && !x509) {				unsigned long err = ERR_peek_last_error();				if (ERR_GET_LIB(err) == ERR_LIB_PEM &&				    ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {					ERR_clear_error();					break;				}			}			ERR(!x509, "%s", cert_src);			write_cert(x509);		}	} 	BIO_free(wb); 	return 0;}