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![David Howells](/assets/img/avatar_default.png)
Make sign-file determine the format of the X.509 certificate by reading the first two bytes and seeing if the first byte is 0x30 and the second 0x81-0x84. If this is the case, assume it's DER encoded, otherwise assume it to be PEM encoded. Without this, it gets awkward to deal with the error messages from d2i_X509_bio() when we want to call BIO_reset() and then PEM_read_bio() in case the certificate was PEM encoded rather than X.509 encoded. Reported-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Ben Hutchings <ben@decadent.org.uk> cc: David Woodhouse <dwmw2@infradead.org> cc: Juerg Haefliger <juerg.haefliger@hpe.com> cc: Ben Hutchings <ben@decadent.org.uk>
397 lines
9.7 KiB
C
Executable file
397 lines
9.7 KiB
C
Executable file
/* Sign a module file using the given key.
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*
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* Copyright © 2014-2016 Red Hat, Inc. All Rights Reserved.
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* Copyright © 2015 Intel Corporation.
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* Copyright © 2016 Hewlett Packard Enterprise Development LP
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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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* Juerg Haefliger <juerg.haefliger@hpe.com>
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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 <getopt.h>
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#include <err.h>
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#include <arpa/inet.h>
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#include <openssl/opensslv.h>
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#include <openssl/bio.h>
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#include <openssl/evp.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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/*
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* Use CMS if we have openssl-1.0.0 or newer available - otherwise we have to
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* assume that it's not available and its header file is missing and that we
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* should use PKCS#7 instead. Switching to the older PKCS#7 format restricts
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* the options we have on specifying the X.509 certificate we want.
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*
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* Further, older versions of OpenSSL don't support manually adding signers to
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* the PKCS#7 message so have to accept that we get a certificate included in
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* the signature message. Nor do such older versions of OpenSSL support
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* signing with anything other than SHA1 - so we're stuck with that if such is
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* the case.
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*/
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#if OPENSSL_VERSION_NUMBER < 0x10000000L || defined(OPENSSL_NO_CMS)
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#define USE_PKCS7
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#endif
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#ifndef USE_PKCS7
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#include <openssl/cms.h>
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#else
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#include <openssl/pkcs7.h>
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#endif
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struct module_signature {
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uint8_t algo; /* Public-key crypto algorithm [0] */
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uint8_t hash; /* Digest algorithm [0] */
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uint8_t id_type; /* Key identifier type [PKEY_ID_PKCS7] */
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uint8_t signer_len; /* Length of signer's name [0] */
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uint8_t key_id_len; /* Length of key identifier [0] */
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uint8_t __pad[3];
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uint32_t sig_len; /* Length of signature data */
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};
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#define PKEY_ID_PKCS7 2
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static char magic_number[] = "~Module signature appended~\n";
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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/sign-file [-dp] <hash algo> <key> <x509> <module> [<dest>]\n");
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fprintf(stderr,
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" scripts/sign-file -s <raw sig> <hash algo> <x509> <module> [<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 int pem_pw_cb(char *buf, int len, int w, void *v)
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{
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int pwlen;
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if (!key_pass)
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return -1;
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pwlen = strlen(key_pass);
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if (pwlen >= len)
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return -1;
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strcpy(buf, key_pass);
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/* If it's wrong, don't keep trying it. */
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key_pass = NULL;
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return pwlen;
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}
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static EVP_PKEY *read_private_key(const char *private_key_name)
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{
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EVP_PKEY *private_key;
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if (!strncmp(private_key_name, "pkcs11:", 7)) {
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ENGINE *e;
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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),
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"Set PKCS#11 PIN");
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private_key = ENGINE_load_private_key(e, private_key_name,
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NULL, NULL);
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ERR(!private_key, "%s", private_key_name);
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} else {
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BIO *b;
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b = BIO_new_file(private_key_name, "rb");
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ERR(!b, "%s", private_key_name);
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private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb,
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NULL);
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ERR(!private_key, "%s", private_key_name);
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BIO_free(b);
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}
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return private_key;
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}
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static X509 *read_x509(const char *x509_name)
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{
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unsigned char buf[2];
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X509 *x509;
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BIO *b;
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int n;
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b = BIO_new_file(x509_name, "rb");
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ERR(!b, "%s", x509_name);
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/* Look at the first two bytes of the file to determine the encoding */
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n = BIO_read(b, buf, 2);
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if (n != 2) {
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if (BIO_should_retry(b)) {
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fprintf(stderr, "%s: Read wanted retry\n", x509_name);
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exit(1);
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}
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if (n >= 0) {
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fprintf(stderr, "%s: Short read\n", x509_name);
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exit(1);
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}
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ERR(1, "%s", x509_name);
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}
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ERR(BIO_reset(b) != 0, "%s", x509_name);
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if (buf[0] == 0x30 && buf[1] >= 0x81 && buf[1] <= 0x84)
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/* Assume raw DER encoded X.509 */
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x509 = d2i_X509_bio(b, NULL);
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else
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/* Assume PEM encoded X.509 */
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x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);
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BIO_free(b);
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ERR(!x509, "%s", x509_name);
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return x509;
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}
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int main(int argc, char **argv)
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{
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struct module_signature sig_info = { .id_type = PKEY_ID_PKCS7 };
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char *hash_algo = NULL;
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char *private_key_name = NULL, *raw_sig_name = NULL;
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char *x509_name, *module_name, *dest_name;
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bool save_sig = false, replace_orig;
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bool sign_only = false;
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bool raw_sig = false;
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unsigned char buf[4096];
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unsigned long module_size, sig_size;
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unsigned int use_signed_attrs;
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const EVP_MD *digest_algo;
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EVP_PKEY *private_key;
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#ifndef USE_PKCS7
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CMS_ContentInfo *cms = NULL;
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unsigned int use_keyid = 0;
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#else
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PKCS7 *pkcs7 = NULL;
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#endif
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X509 *x509;
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BIO *bd, *bm;
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int opt, n;
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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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key_pass = getenv("KBUILD_SIGN_PIN");
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#ifndef USE_PKCS7
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use_signed_attrs = CMS_NOATTR;
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#else
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use_signed_attrs = PKCS7_NOATTR;
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#endif
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do {
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opt = getopt(argc, argv, "sdpk");
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switch (opt) {
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case 's': raw_sig = true; break;
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case 'p': save_sig = true; break;
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case 'd': sign_only = true; save_sig = true; break;
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#ifndef USE_PKCS7
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case 'k': use_keyid = CMS_USE_KEYID; break;
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#endif
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case -1: break;
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default: format();
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}
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} while (opt != -1);
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argc -= optind;
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argv += optind;
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if (argc < 4 || argc > 5)
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format();
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if (raw_sig) {
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raw_sig_name = argv[0];
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hash_algo = argv[1];
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} else {
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hash_algo = argv[0];
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private_key_name = argv[1];
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}
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x509_name = argv[2];
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module_name = argv[3];
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if (argc == 5) {
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dest_name = argv[4];
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replace_orig = false;
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} else {
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ERR(asprintf(&dest_name, "%s.~signed~", module_name) < 0,
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"asprintf");
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replace_orig = true;
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}
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#ifdef USE_PKCS7
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if (strcmp(hash_algo, "sha1") != 0) {
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fprintf(stderr, "sign-file: %s only supports SHA1 signing\n",
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OPENSSL_VERSION_TEXT);
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exit(3);
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}
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#endif
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/* Open the module file */
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bm = BIO_new_file(module_name, "rb");
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ERR(!bm, "%s", module_name);
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if (!raw_sig) {
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/* Read the private key and the X.509 cert the PKCS#7 message
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* will point to.
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*/
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private_key = read_private_key(private_key_name);
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x509 = read_x509(x509_name);
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/* Digest the module data. */
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OpenSSL_add_all_digests();
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display_openssl_errors(__LINE__);
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digest_algo = EVP_get_digestbyname(hash_algo);
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ERR(!digest_algo, "EVP_get_digestbyname");
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#ifndef USE_PKCS7
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/* Load the signature message from the digest buffer. */
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cms = CMS_sign(NULL, NULL, NULL, NULL,
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CMS_NOCERTS | CMS_PARTIAL | CMS_BINARY |
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CMS_DETACHED | CMS_STREAM);
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ERR(!cms, "CMS_sign");
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ERR(!CMS_add1_signer(cms, x509, private_key, digest_algo,
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CMS_NOCERTS | CMS_BINARY |
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CMS_NOSMIMECAP | use_keyid |
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use_signed_attrs),
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"CMS_add1_signer");
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ERR(CMS_final(cms, bm, NULL, CMS_NOCERTS | CMS_BINARY) < 0,
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"CMS_final");
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#else
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pkcs7 = PKCS7_sign(x509, private_key, NULL, bm,
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PKCS7_NOCERTS | PKCS7_BINARY |
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PKCS7_DETACHED | use_signed_attrs);
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ERR(!pkcs7, "PKCS7_sign");
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#endif
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if (save_sig) {
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char *sig_file_name;
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BIO *b;
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ERR(asprintf(&sig_file_name, "%s.p7s", module_name) < 0,
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"asprintf");
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b = BIO_new_file(sig_file_name, "wb");
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ERR(!b, "%s", sig_file_name);
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#ifndef USE_PKCS7
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ERR(i2d_CMS_bio_stream(b, cms, NULL, 0) < 0,
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"%s", sig_file_name);
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#else
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ERR(i2d_PKCS7_bio(b, pkcs7) < 0,
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"%s", sig_file_name);
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#endif
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BIO_free(b);
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}
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if (sign_only) {
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BIO_free(bm);
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return 0;
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}
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}
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/* Open the destination file now so that we can shovel the module data
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* across as we read it.
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*/
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bd = BIO_new_file(dest_name, "wb");
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ERR(!bd, "%s", dest_name);
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/* Append the marker and the PKCS#7 message to the destination file */
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ERR(BIO_reset(bm) < 0, "%s", module_name);
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while ((n = BIO_read(bm, buf, sizeof(buf))),
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n > 0) {
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ERR(BIO_write(bd, buf, n) < 0, "%s", dest_name);
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}
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BIO_free(bm);
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ERR(n < 0, "%s", module_name);
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module_size = BIO_number_written(bd);
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if (!raw_sig) {
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#ifndef USE_PKCS7
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ERR(i2d_CMS_bio_stream(bd, cms, NULL, 0) < 0, "%s", dest_name);
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#else
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ERR(i2d_PKCS7_bio(bd, pkcs7) < 0, "%s", dest_name);
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#endif
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} else {
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BIO *b;
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/* Read the raw signature file and write the data to the
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* destination file
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*/
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b = BIO_new_file(raw_sig_name, "rb");
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ERR(!b, "%s", raw_sig_name);
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while ((n = BIO_read(b, buf, sizeof(buf))), n > 0)
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ERR(BIO_write(bd, buf, n) < 0, "%s", dest_name);
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BIO_free(b);
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}
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sig_size = BIO_number_written(bd) - module_size;
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sig_info.sig_len = htonl(sig_size);
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ERR(BIO_write(bd, &sig_info, sizeof(sig_info)) < 0, "%s", dest_name);
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ERR(BIO_write(bd, magic_number, sizeof(magic_number) - 1) < 0, "%s", dest_name);
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ERR(BIO_free(bd) < 0, "%s", dest_name);
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/* Finally, if we're signing in place, replace the original. */
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if (replace_orig)
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ERR(rename(dest_name, module_name) < 0, "%s", dest_name);
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return 0;
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}
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