163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/* Extract X.509 certificate in DER form from PKCS#11 or PEM.
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*
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* Copyright © 2014-2015 Red Hat, Inc. All Rights Reserved.
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* Copyright © 2015 Intel Corporation.
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*
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* Authors: David Howells <dhowells@redhat.com>
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* David Woodhouse <dwmw2@infradead.org>
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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 Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* 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 <err.h>
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#include <openssl/bio.h>
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#include <openssl/pem.h>
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#include <openssl/err.h>
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#include <openssl/engine.h>
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#define PKEY_ID_PKCS7 2
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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/extract-cert <source> <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 BIO *wb;
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static char *cert_dst;
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static int kbuild_verbose;
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static void write_cert(X509 *x509)
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{
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char buf[200];
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if (!wb) {
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wb = BIO_new_file(cert_dst, "wb");
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ERR(!wb, "%s", cert_dst);
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}
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X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));
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ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst);
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if (kbuild_verbose)
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fprintf(stderr, "Extracted cert: %s\n", buf);
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}
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int main(int argc, char **argv)
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{
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char *cert_src;
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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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kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0");
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key_pass = getenv("KBUILD_SIGN_PIN");
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if (argc != 3)
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format();
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cert_src = argv[1];
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cert_dst = argv[2];
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if (!cert_src[0]) {
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/* Invoked with no input; create empty file */
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FILE *f = fopen(cert_dst, "wb");
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ERR(!f, "%s", cert_dst);
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fclose(f);
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exit(0);
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} else if (!strncmp(cert_src, "pkcs11:", 7)) {
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ENGINE *e;
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struct {
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const char *cert_id;
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X509 *cert;
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} parms;
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parms.cert_id = cert_src;
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parms.cert = NULL;
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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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ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);
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ERR(!parms.cert, "Get X.509 from PKCS#11");
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write_cert(parms.cert);
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} else {
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BIO *b;
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X509 *x509;
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b = BIO_new_file(cert_src, "rb");
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ERR(!b, "%s", cert_src);
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while (1) {
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x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);
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if (wb && !x509) {
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unsigned long err = ERR_peek_last_error();
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if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
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ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
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ERR_clear_error();
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break;
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}
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}
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ERR(!x509, "%s", cert_src);
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write_cert(x509);
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}
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}
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BIO_free(wb);
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return 0;
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}
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