2 * Copyright (c) 2014 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
42 #include <openssl/conf.h>
43 #include <openssl/evp.h>
44 #include <openssl/err.h>
45 #include <openssl/pem.h>
46 #include <openssl/pkcs7.h>
55 fprintf(stderr, "usage: uefisign -c cert -k key -o outfile [-v] file\n"
56 " uefisign -V [-c cert] [-v] file\n");
61 checked_strdup(const char *s)
72 checked_fopen(const char *path, const char *mode)
78 fp = fopen(path, mode);
85 send_chunk(const void *buf, size_t len, int pipefd)
89 ret = write(pipefd, &len, sizeof(len));
90 if (ret != sizeof(len))
92 ret = write(pipefd, buf, len);
93 if (ret != (ssize_t)len)
98 receive_chunk(void **bufp, size_t *lenp, int pipefd)
104 ret = read(pipefd, &len, sizeof(len));
105 if (ret != sizeof(len))
108 buf = calloc(1, len);
112 ret = read(pipefd, buf, len);
113 if (ret != (ssize_t)len)
121 bin2hex(const char *bin, size_t bin_len)
123 unsigned char *hex, *tmp, ch;
127 hex_len = bin_len * 2 + 1; /* +1 for '\0'. */
128 hex = malloc(hex_len);
133 for (i = 0; i < bin_len; i++) {
135 tmp += sprintf(tmp, "%02x", ch);
142 * We need to replace a standard chunk of PKCS7 signature with one mandated
143 * by Authenticode. Problem is, replacing it just like that and then calling
144 * PKCS7_final() would make OpenSSL segfault somewhere in PKCS7_dataFinal().
145 * So, instead, we call PKCS7_dataInit(), then put our Authenticode-specific
146 * data into BIO it returned, then call PKCS7_dataFinal() - which now somehow
147 * does not panic - and _then_ we replace it in the signature. This technique
148 * was used in sbsigntool by Jeremy Kerr, and might have originated in
152 magic(PKCS7 *pkcs7, const char *digest, size_t digest_len)
158 unsigned char *buf, *tmp;
159 char *digest_hex, *magic_conf, *str;
162 digest_hex = bin2hex(digest, digest_len);
165 * Construct the SpcIndirectDataContent chunk.
167 nid = OBJ_create("1.3.6.1.4.1.311.2.1.4", NULL, NULL);
169 asprintf(&magic_conf, magic_fmt, digest_hex);
170 if (magic_conf == NULL)
173 bio = BIO_new_mem_buf((void *)magic_conf, -1);
175 ERR_print_errors_fp(stderr);
176 errx(1, "BIO_new_mem_buf(3) failed");
179 cnf = NCONF_new(NULL);
181 ERR_print_errors_fp(stderr);
182 errx(1, "NCONF_new(3) failed");
185 ok = NCONF_load_bio(cnf, bio, NULL);
187 ERR_print_errors_fp(stderr);
188 errx(1, "NCONF_load_bio(3) failed");
191 str = NCONF_get_string(cnf, "default", "asn1");
193 ERR_print_errors_fp(stderr);
194 errx(1, "NCONF_get_string(3) failed");
197 t = ASN1_generate_nconf(str, cnf);
199 ERR_print_errors_fp(stderr);
200 errx(1, "ASN1_generate_nconf(3) failed");
204 * We now have our proprietary piece of ASN.1. Let's do
205 * the actual signing.
207 len = i2d_ASN1_TYPE(t, NULL);
208 tmp = buf = calloc(1, len);
211 i2d_ASN1_TYPE(t, &tmp);
214 * We now have contents of 't' stuffed into memory buffer 'buf'.
219 t_bio = PKCS7_dataInit(pkcs7, NULL);
221 ERR_print_errors_fp(stderr);
222 errx(1, "PKCS7_dataInit(3) failed");
225 BIO_write(t_bio, buf + 2, len - 2);
227 ok = PKCS7_dataFinal(pkcs7, t_bio);
229 ERR_print_errors_fp(stderr);
230 errx(1, "PKCS7_dataFinal(3) failed");
234 s = ASN1_STRING_new();
235 ASN1_STRING_set(s, buf, len);
236 ASN1_TYPE_set(t, V_ASN1_SEQUENCE, s);
238 PKCS7_set0_type_other(pkcs7->d.sign->contents, nid, t);
242 sign(X509 *cert, EVP_PKEY *key, int pipefd)
247 PKCS7_SIGNER_INFO *info;
248 void *digest, *signature;
249 size_t digest_len, signature_len;
252 assert(cert != NULL);
255 receive_chunk(&digest, &digest_len, pipefd);
257 bio = BIO_new_mem_buf(digest, digest_len);
259 ERR_print_errors_fp(stderr);
260 errx(1, "BIO_new_mem_buf(3) failed");
263 pkcs7 = PKCS7_sign(NULL, NULL, NULL, bio, PKCS7_BINARY | PKCS7_PARTIAL);
265 ERR_print_errors_fp(stderr);
266 errx(1, "PKCS7_sign(3) failed");
269 md = EVP_get_digestbyname(DIGEST);
271 ERR_print_errors_fp(stderr);
272 errx(1, "EVP_get_digestbyname(\"%s\") failed", DIGEST);
275 info = PKCS7_sign_add_signer(pkcs7, cert, key, md, 0);
277 ERR_print_errors_fp(stderr);
278 errx(1, "PKCS7_sign_add_signer(3) failed");
282 * XXX: All the signed binaries seem to have this, but where is it
283 * described in the spec?
285 PKCS7_add_signed_attribute(info, NID_pkcs9_contentType,
286 V_ASN1_OBJECT, OBJ_txt2obj("1.3.6.1.4.1.311.2.1.4", 1));
288 magic(pkcs7, digest, digest_len);
291 out = BIO_new(BIO_s_file());
292 BIO_set_fp(out, stdout, BIO_NOCLOSE);
293 PKCS7_print_ctx(out, pkcs7, 0, NULL);
295 i2d_PKCS7_bio(out, pkcs7);
298 out = BIO_new(BIO_s_mem());
300 ERR_print_errors_fp(stderr);
301 errx(1, "BIO_new(3) failed");
304 ok = i2d_PKCS7_bio(out, pkcs7);
306 ERR_print_errors_fp(stderr);
307 errx(1, "i2d_PKCS7_bio(3) failed");
310 signature_len = BIO_get_mem_data(out, &signature);
311 if (signature_len <= 0) {
312 ERR_print_errors_fp(stderr);
313 errx(1, "BIO_get_mem_data(3) failed");
316 (void)BIO_set_close(out, BIO_NOCLOSE);
319 send_chunk(signature, signature_len, pipefd);
323 wait_for_child(pid_t pid)
327 pid = waitpid(pid, &status, 0);
331 return (WEXITSTATUS(status));
335 main(int argc, char **argv)
338 bool Vflag = false, vflag = false;
339 const char *certpath = NULL, *keypath = NULL, *outpath = NULL, *inpath = NULL;
340 FILE *certfp = NULL, *keyfp = NULL;
342 EVP_PKEY *key = NULL;
346 while ((ch = getopt(argc, argv, "Vc:k:o:v")) != -1) {
352 certpath = checked_strdup(optarg);
355 keypath = checked_strdup(optarg);
358 outpath = checked_strdup(optarg);
374 if (certpath != NULL)
375 errx(1, "-V and -c are mutually exclusive");
377 errx(1, "-V and -k are mutually exclusive");
379 errx(1, "-V and -o are mutually exclusive");
381 if (certpath == NULL)
382 errx(1, "-c option is mandatory");
384 errx(1, "-k option is mandatory");
386 errx(1, "-o option is mandatory");
391 OPENSSL_config(NULL);
392 ERR_load_crypto_strings();
393 OpenSSL_add_all_algorithms();
395 error = pipe(pipefds);
404 return (child(inpath, outpath, pipefds[1], Vflag, vflag));
407 certfp = checked_fopen(certpath, "r");
408 cert = PEM_read_X509(certfp, NULL, NULL, NULL);
410 ERR_print_errors_fp(stderr);
411 errx(1, "failed to load certificate from %s", certpath);
414 keyfp = checked_fopen(keypath, "r");
415 key = PEM_read_PrivateKey(keyfp, NULL, NULL, NULL);
417 ERR_print_errors_fp(stderr);
418 errx(1, "failed to load private key from %s", keypath);
421 sign(cert, key, pipefds[0]);
424 return (wait_for_child(pid));