NetBSD-5.0.2/usr.bin/nbsvtool/nbsvtool.c
/* $NetBSD: nbsvtool.c,v 1.2 2008/06/11 16:31:09 joerg Exp $ */
/*-
* Copyright (c) 2004, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Love Hörnquist Åstrand <lha@it.su.se>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/pkcs7.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/ui.h>
static int verbose_flag;
static unsigned long key_usage = 0;
/*
* openssl command line equivalents
*
* openssl smime -verify \
* -inform PEM -in nbsvtool.c.sig -content nbsvtool.c \
* -CAfile /secure/lha/su/CA/swupki-pca.crt -out /dev/null
* openssl smime -sign \
* -noattr -binary -outform PEM -out nbsvtool.c.sig \
* -in nbsvtool.c -signer /secure/lha/su/CA/lha.crt \
* -certfile /secure/lha/su/CA/lha-chain \
* -inkey /secure/lha/su/CA/lha.key
*/
/*
* Create a detach PEM signature of file `infile' and store it in
* `outfile'. The signer certificate `cert' and private key
* `private_key' must be given. An additional hint to the verifier how
* to find the path from the `cert' to the x509 anchor can be passed
* in `cert_chain'.
*/
static void
sign_file(X509 *cert, EVP_PKEY *private_key, STACK_OF(X509) *cert_chain,
const char *infile, const char *outfile)
{
BIO *out, *in;
PKCS7 *p7;
out = BIO_new_file(outfile, "w");
if (out == NULL)
err(EXIT_FAILURE, "Failed to open signature output file: %s",
outfile);
in = BIO_new_file(infile, "r");
if (in == NULL)
err(EXIT_FAILURE, "Failed to input file: %s", infile);
p7 = PKCS7_sign(cert, private_key, cert_chain, in,
PKCS7_DETACHED|PKCS7_NOATTR|PKCS7_BINARY);
if (p7 == NULL)
errx(EXIT_FAILURE, "Failed to create signature structure");
PEM_write_bio_PKCS7(out, p7);
PKCS7_free(p7);
BIO_free(in);
BIO_free_all(out);
}
/*
* Verifies a detached PEM signature in the file `sigfile' of file
* `infile'. The trust anchor file `anchor' to the trust anchors must
* be given. If its suspended that the sender didn't inlude the whole
* path from the signing certificate to the given trust anchor, extra
* certificates can be passed in `cert_chain'.
*/
static void
verify_file(STACK_OF(X509) *cert_chain, const char *anchor,
const char *infile, const char *sigfile)
{
STACK_OF(X509) *signers;
X509_STORE *store;
BIO *sig, *in;
PKCS7 *p7;
int ret, i;
X509_NAME *name;
char *subject;
store = X509_STORE_new();
if (store == NULL)
err(1, "Failed to create store");
X509_STORE_load_locations(store, anchor, NULL);
in = BIO_new_file(infile, "r");
if (in == NULL)
err(EXIT_FAILURE, "Failed to open input data file: %s", infile);
sig = BIO_new_file(sigfile, "r");
if (sig == NULL)
err(EXIT_FAILURE, "Failed to open signature input file: %s",
sigfile);
p7 = PEM_read_bio_PKCS7(sig, NULL, NULL, NULL);
if (p7 == NULL)
errx(EXIT_FAILURE, "Failed to parse the signature file %s",
sigfile);
ret = PKCS7_verify(p7, cert_chain, store, in, NULL, 0);
if (ret != 1)
errx(EXIT_FAILURE, "Failed to verify signature");
signers = PKCS7_get0_signers(p7, NULL, 0);
if (signers == NULL)
errx(EXIT_FAILURE, "Failed to get signers");
if (sk_X509_num(signers) == 0)
errx(EXIT_FAILURE, "No signers ?");
if (key_usage != 0) {
for (i = 0; i < sk_X509_num(signers); i++) {
if ((sk_X509_value(signers, i)->ex_xkusage & key_usage)
== key_usage)
continue;
name = X509_get_subject_name(sk_X509_value(signers, i));
subject = X509_NAME_oneline(name, NULL, 0);
errx(EXIT_FAILURE,
"Certificate doesn't match required key usage: %s",
subject);
}
}
if (verbose_flag)
printf("Sigature ok, signed by:\n");
for (i = 0; i < sk_X509_num(signers); i++) {
name = X509_get_subject_name(sk_X509_value(signers, i));
subject = X509_NAME_oneline(name, NULL, 0);
if (verbose_flag)
printf("\t%s\n", subject);
OPENSSL_free(subject);
}
PKCS7_free(p7);
BIO_free(in);
BIO_free(sig);
}
/*
* Parse and return a list PEM encoded certificates in the file
* `file'. In case of error or an empty file, and error text will be
* printed and the function will exit(3).
*/
static STACK_OF(X509) *
file_to_certs(const char *file)
{
STACK_OF(X509) *certs;
FILE *f;
f = fopen(file, "r");
if (f == NULL)
err(EXIT_FAILURE, "Cannot open certificate file %s", file);
certs = sk_X509_new_null();
while (1) {
X509 *cert;
cert = PEM_read_X509(f, NULL, NULL, NULL);
if (cert == NULL) {
unsigned long ret;
ret = ERR_GET_REASON(ERR_peek_error());
if (ret == PEM_R_NO_START_LINE) {
/* End of file reached. no error */
ERR_clear_error();
break;
}
errx(EXIT_FAILURE, "Can't read certificate file %s",
file);
}
sk_X509_insert(certs, cert, sk_X509_num(certs));
}
fclose(f);
if (sk_X509_num(certs) == 0)
errx(EXIT_FAILURE, "No certificate found file %s", file);
return certs;
}
static int
ssl_pass_cb(char *buf, int size, int rwflag, void *u)
{
if (UI_UTIL_read_pw_string(buf, size, "Passphrase: ", 0))
return 0;
return strlen(buf);
}
static struct {
X509 *certificate;
STACK_OF(X509) *cert_chain;
EVP_PKEY *private_key;
} crypto_state;
/*
* Load the certificate file `cert_file' with the associated private
* key file `key_file'. The private key is checked to make sure it
* matches the certificate. The optional hints for the path to the CA
* is stored in `chain_file'.
*/
static void
load_keys(const char *cert_file, const char *chain_file, const char *key_file)
{
STACK_OF(X509) *c;
FILE *f;
int ret;
if (cert_file == NULL)
errx(EXIT_FAILURE, "No certificate file given");
if (key_file == NULL)
errx(EXIT_FAILURE, "No private key file given");
c = file_to_certs(cert_file);
if (sk_X509_num(c) != 1)
errx(EXIT_FAILURE,
"More then one certificate in the certificate file");
crypto_state.certificate = sk_X509_value(c, 0);
if (chain_file)
crypto_state.cert_chain = file_to_certs(chain_file);
/* load private key */
f = fopen(key_file, "r");
if (f == NULL)
errx(1, "Failed to open private key file %s", key_file);
crypto_state.private_key =
PEM_read_PrivateKey(f, NULL, ssl_pass_cb, NULL);
fclose(f);
if (crypto_state.private_key == NULL)
errx(EXIT_FAILURE, "Can't read private key %s", key_file);
ret = X509_check_private_key(crypto_state.certificate,
crypto_state.private_key);
if (ret != 1)
errx(EXIT_FAILURE,
"The private key %s doesn't match the certificate %s",
key_file, cert_file);
}
static void __dead
usage(int exit_code)
{
printf("%s usage\n", getprogname());
printf("%s -k keyfile -c cert-chain [-f cert-chain] sign file\n",
getprogname());
printf("%s [-u code|...] [-a x509-anchor-file] verify filename.sp7\n",
getprogname());
printf("%s [-u code|...] [-a x509-anchor-file] verify filename otherfilename.sp7\n",
getprogname());
printf("%s [-u code|...] [-a x509-anchor-file] verify-code file ...\n",
getprogname());
exit(exit_code);
}
int
main(int argc, char **argv)
{
const char *anchors = NULL;
const char *cert_file = NULL, *key_file = NULL, *chain_file = NULL;
const char *file;
char *sigfile;
int ch;
setprogname(argv[0]);
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
while ((ch = getopt(argc, argv, "a:c:f:hk:u:v")) != -1) {
switch (ch) {
case 'a':
anchors = optarg;
break;
case 'f':
chain_file = optarg;
break;
case 'k':
key_file = optarg;
break;
case 'c':
cert_file = optarg;
break;
case 'u':
if (strcmp("ssl-server", optarg) == 0)
key_usage |= XKU_SSL_SERVER;
else if (strcmp("ssl-client", optarg) == 0)
key_usage |= XKU_SSL_CLIENT;
else if (strcmp("code", optarg) == 0)
key_usage |= XKU_CODE_SIGN;
else if (strcmp("smime", optarg) == 0)
key_usage |= XKU_SMIME;
else
errx(1, "Unknown keyusage: %s", optarg);
break;
case 'v':
verbose_flag = 1;
break;
case 'h':
usage(EXIT_SUCCESS);
default:
usage(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
fprintf(stderr, "Command missing [sign|verify]\n");
usage(EXIT_FAILURE);
}
if (strcmp(argv[0], "sign") == 0) {
if (argc < 2)
usage(1);
file = argv[1];
asprintf(&sigfile, "%s.sp7", file);
if (sigfile == NULL)
err(EXIT_FAILURE, "asprintf failed");
load_keys(cert_file, chain_file, key_file);
sign_file(crypto_state.certificate,
crypto_state.private_key,
crypto_state.cert_chain,
file,
sigfile);
} else if (strcmp(argv[0], "verify") == 0
|| strcmp(argv[0], "verify-code") == 0) {
if (strcmp(argv[0], "verify-code") == 0)
key_usage |= XKU_CODE_SIGN;
if (argc < 2)
usage(1);
else if (argc < 3) {
char *dot;
sigfile = argv[1];
file = strdup(sigfile);
if (file == NULL)
err(1, "strdup failed");
dot = strrchr(file, '.');
if (dot == NULL || strchr(dot, '/') != NULL)
errx(EXIT_FAILURE,
"File name missing suffix");
if (strcmp(".sp7", dot) != 0)
errx(EXIT_FAILURE,
"File name bad suffix (%s)", dot);
*dot = '\0';
} else {
file = argv[1];
sigfile = argv[2];
}
verify_file(crypto_state.cert_chain, anchors, file, sigfile);
} else {
fprintf(stderr, "Unknown command: %s\n", argv[0]);
usage(EXIT_FAILURE);
}
return 0;
}