cregit-Linux how code gets into the kernel

Release 4.10 scripts/extract-cert.c

Directory: scripts
/* 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 <>
 *          David Woodhouse <>
 * 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)
		"Usage: scripts/extract-cert <source> <dest>\n");

static void display_openssl_errors(int l)
	const char *file;
	char buf[120];
	int e, line;

	if (ERR_peek_error() == 0)
	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)) {} }


david woodhousedavid woodhouse36100.00%1100.00%

#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); }


david woodhousedavid woodhouse8397.65%150.00%
david howellsdavid howells22.35%150.00%

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; }


david woodhousedavid woodhouse359100.00%2100.00%

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david woodhousedavid woodhouse64799.69%375.00%
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Directory: scripts
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