--- /dev/null
+SHELL = /bin/sh
+CC = gcc
+
+.PHONY: all install clean distclean
+.DEFAULT: all
+
+CFLAGS += -Iinsn -Wall -g
+LDFLAGS = -lcrypto
+
+CERTS = signing_key.pem signing_key.x509
+TARGETS = sign-file extract-cert $(CERTS)
+SIGN_OBJS = sign-file.o
+EXTRACT_CERT_OBJS = extract-cert.o
+SOURCES = sign-file.c extract-cert.c
+
+all: $(TARGETS)
+
+-include $(SOURCES:.c=.d)
+
+%.o : %.c
+ $(CC) -MMD -MP $(CFLAGS) -c -o $@ $<
+
+sign-file: $(SIGN_OBJS)
+ $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
+extract-cert: $(EXTRACT_CERT_OBJS)
+ $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+
+clean:
+ $(RM) $(TARGETS) $(SIGN_OBJS) $(EXTRACT_CERT_OBJS) *.d insn/*.d
+
+distclean: clean
+ $(RM) $(CERTS)
+
+# Generate a certificate if needed
+# These routines come from Linux.
+signing_key.pem: x509.genkey
+ @echo "###"
+ @echo "### Now generating an X.509 key pair to be used for signing modules."
+ @echo "###"
+ @echo "### If this takes a long time, you might wish to run rngd in the"
+ @echo "### background to keep the supply of entropy topped up. It"
+ @echo "### needs to be run as root, and uses a hardware random"
+ @echo "### number generator if one is available."
+ @echo "###"
+ openssl req -new -nodes -utf8 -sha256 -days 36500 \
+ -batch -x509 -config x509.genkey \
+ -outform PEM -out signing_key.pem \
+ -keyout signing_key.pem 2>&1
+ @echo "###"
+ @echo "### Key pair generated."
+ @echo "###"
+
+x509.genkey:
+ @echo Generating X.509 key generation config
+ @echo >$@ "[ req ]"
+ @echo >>$@ "default_bits = 4096"
+ @echo >>$@ "distinguished_name = req_distinguished_name"
+ @echo >>$@ "prompt = no"
+ @echo >>$@ "string_mask = utf8only"
+ @echo >>$@ "x509_extensions = myexts"
+ @echo >>$@
+ @echo >>$@ "[ req_distinguished_name ]"
+ @echo >>$@ "#O = Unspecified company"
+ @echo >>$@ "CN = Build time autogenerated kernel key"
+ @echo >>$@ "#emailAddress = unspecified.user@unspecified.company"
+ @echo >>$@
+ @echo >>$@ "[ myexts ]"
+ @echo >>$@ "basicConstraints=critical,CA:FALSE"
+ @echo >>$@ "keyUsage=digitalSignature"
+ @echo >>$@ "subjectKeyIdentifier=hash"
+ @echo >>$@ "authorityKeyIdentifier=keyid"
+.INTERMEDIATE: x509.genkey
+
+signing_key.x509: extract-cert signing_key.pem
+ ./extract-cert signing_key.pem $@
--- /dev/null
+/* 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;
+}
--- /dev/null
+/* 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: 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;
+}
projects / livepatch-build-tools.git / commitdiff