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openwrt/package/utils/px5g-wolfssl/px5g-wolfssl.c
Jeffrey Elms ff2087d9a9 px5g-wolfssl: Fix certificate signature
Certificate signature algorithm was being set after call to
`wc_MakeCert`, resulting in a mismatch between specified signature in
certificate and the actual signature type.

Signed-off-by: Jeffrey Elms <jeff@wolfssl.com>
[fix commit subject, use COMMITCOUNT]
Signed-off-by: Paul Spooren <mail@aparcar.org>
2021-01-26 16:59:53 -10:00

355 lines
9.2 KiB
C

// Copyright 2020 Paul Spooren <mail@aparcar.org>
//
// SPDX-License-Identifier: GPL-2.0-or-later
#define _GNU_SOURCE
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <wolfssl/options.h>
#include <wolfssl/wolfcrypt/asn.h>
#include <wolfssl/wolfcrypt/asn_public.h>
#include <wolfssl/wolfcrypt/ecc.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/rsa.h>
#include <wolfssl/wolfcrypt/settings.h>
#define HEAP_HINT NULL
#define FOURK_SZ 4096
#define WOLFSSL_MIN_RSA_BITS 2048
enum {
EC_KEY_TYPE = 0,
RSA_KEY_TYPE = 1,
};
int write_file(byte *buf, int bufSz, char *path) {
int ret;
FILE *file;
if (path) {
file = fopen(path, "wb");
if (file == NULL) {
perror("Error opening file");
exit(1);
}
} else {
file = stdout;
}
ret = (int)fwrite(buf, 1, bufSz, file);
if (path) {
fclose(file);
}
if (ret > 0) {
/* ret > 0 indicates a successful file write, set to zero for return */
ret = 0;
}
return ret;
}
int write_key(ecc_key *ecKey, RsaKey *rsaKey, int type, int keySz, char *fName,
bool write_pem) {
int ret;
byte der[FOURK_SZ] = {};
byte pem[FOURK_SZ] = {};
int derSz, pemSz;
if (type == EC_KEY_TYPE) {
ret = wc_EccKeyToDer(ecKey, der, sizeof(der));
} else {
ret = wc_RsaKeyToDer(rsaKey, der, sizeof(der));
}
if (ret <= 0) {
fprintf(stderr, "Key To DER failed: %d\n", ret);
}
derSz = ret;
if (write_pem) {
if (type == EC_KEY_TYPE) {
ret = wc_DerToPem(der, derSz, pem, sizeof(pem), ECC_PRIVATEKEY_TYPE);
} else {
ret = wc_DerToPem(der, derSz, pem, sizeof(pem), PRIVATEKEY_TYPE);
}
if (ret <= 0) {
fprintf(stderr, "DER to PEM failed: %d\n", ret);
}
pemSz = ret;
ret = write_file(pem, pemSz, fName);
} else {
ret = write_file(der, derSz, fName);
}
return ret;
}
int gen_key(WC_RNG *rng, ecc_key *ecKey, RsaKey *rsaKey, int type, int keySz,
long exp, int curve) {
int ret;
if (type == EC_KEY_TYPE) {
ret = wc_ecc_init(ecKey);
(void)rsaKey;
} else {
ret = wc_InitRsaKey(rsaKey, NULL);
(void)ecKey;
}
if (ret != 0) {
fprintf(stderr, "Key initialization failed: %d\n", ret);
return ret;
}
if (type == EC_KEY_TYPE) {
fprintf(stderr, "Generating EC private key\n");
ret = wc_ecc_make_key_ex(rng, 32, ecKey, curve);
} else {
fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", keySz);
ret = wc_MakeRsaKey(rsaKey, keySz, WC_RSA_EXPONENT, rng);
}
if (ret != 0) {
fprintf(stderr, "Key generation failed: %d\n", ret);
}
return ret;
}
int selfsigned(WC_RNG *rng, char **arg) {
ecc_key ecKey;
RsaKey rsaKey;
int ret;
char *subject = "";
int keySz = WOLFSSL_MIN_RSA_BITS;
int type = EC_KEY_TYPE;
int exp = WC_RSA_EXPONENT;
int curve = ECC_SECP256R1;
unsigned int days = 3653; // 10 years
char *keypath = NULL, *certpath = NULL;
char fstr[20], tstr[20];
bool pem = true;
Cert newCert;
#ifdef __USE_TIME_BITS64
time_t to, from = time(NULL);
#else
unsigned long to, from = time(NULL);
#endif
byte derBuf[FOURK_SZ] = {};
byte pemBuf[FOURK_SZ] = {};
int pemSz = -1;
int derSz = -1;
char *key, *val, *tmp;
ret = wc_InitCert(&newCert);
if (ret != 0) {
fprintf(stderr, "Init Cert failed: %d\n", ret);
return ret;
}
newCert.isCA = 0;
while (*arg && **arg == '-') {
if (!strncmp(*arg, "-der", 4)) {
pem = false;
} else if (!strncmp(*arg, "-newkey", 6) && arg[1]) {
if (!strncmp(arg[1], "rsa:", 4)) {
type = RSA_KEY_TYPE;
keySz = (unsigned int)atoi(arg[1] + 4);
} else if (!strncmp(arg[1], "ec", 2)) {
type = EC_KEY_TYPE;
} else {
fprintf(stderr, "error: invalid algorithm\n");
return 1;
}
arg++;
} else if (!strncmp(*arg, "-days", 5) && arg[1]) {
days = (unsigned int)atoi(arg[1]);
arg++;
} else if (!strncmp(*arg, "-pkeyopt", 8) && arg[1]) {
if (strncmp(arg[1], "ec_paramgen_curve:", 18)) {
fprintf(stderr, "error: invalid pkey option: %s\n", arg[1]);
return 1;
}
if (!strncmp(arg[1] + 18, "P-256:", 5)) {
curve = ECC_SECP256R1;
} else if (!strncmp(arg[1] + 18, "P-384:", 5)) {
curve = ECC_SECP384R1;
} else if (!strncmp(arg[1] + 18, "P-521:", 5)) {
curve = ECC_SECP521R1;
} else {
fprintf(stderr, "error: invalid curve name: %s\n", arg[1] + 18);
return 1;
}
arg++;
} else if (!strncmp(*arg, "-keyout", 7) && arg[1]) {
keypath = arg[1];
arg++;
} else if (!strncmp(*arg, "-out", 4) && arg[1]) {
certpath = arg[1];
arg++;
} else if (!strcmp(*arg, "-subj") && arg[1]) {
subject = strdupa(arg[1]);
key = arg[1];
do {
tmp = strchr(key, '/');
if (tmp)
*tmp = '\0';
val = strchr(key, '=');
if (val) {
*val = '\0';
++val;
if (!strcmp(key, "C"))
strncpy(newCert.subject.country, val, CTC_NAME_SIZE);
else if (!strcmp(key, "ST"))
strncpy(newCert.subject.state, val, CTC_NAME_SIZE);
else if (!strcmp(key, "L"))
strncpy(newCert.subject.locality, val, CTC_NAME_SIZE);
else if (!strcmp(key, "O"))
strncpy(newCert.subject.org, val, CTC_NAME_SIZE);
else if (!strcmp(key, "OU"))
strncpy(newCert.subject.unit, val, CTC_NAME_SIZE);
else if (!strcmp(key, "CN"))
strncpy(newCert.subject.commonName, val, CTC_NAME_SIZE);
else if (!strcmp(key, "EMAIL"))
strncpy(newCert.subject.email, val, CTC_NAME_SIZE);
else
printf("warning: unknown attribute %s=%s\n", key, val);
}
} while (tmp && (key = ++tmp));
}
arg++;
}
newCert.daysValid = days;
gen_key(rng, &ecKey, &rsaKey, type, keySz, exp, curve);
write_key(&ecKey, &rsaKey, type, keySz, keypath, pem);
from = (from < 1000000000) ? 1000000000 : from;
strftime(fstr, sizeof(fstr), "%Y%m%d%H%M%S", gmtime(&from));
to = from + 60 * 60 * 24 * days;
if (to < from)
to = INT_MAX;
strftime(tstr, sizeof(tstr), "%Y%m%d%H%M%S", gmtime(&to));
fprintf(stderr,
"Generating selfsigned certificate with subject '%s'"
" and validity %s-%s\n",
subject, fstr, tstr);
if (type == EC_KEY_TYPE) {
newCert.sigType = CTC_SHA256wECDSA;
ret = wc_MakeCert(&newCert, derBuf, sizeof(derBuf), NULL, &ecKey, rng);
} else {
newCert.sigType = CTC_SHA256wRSA;
ret = wc_MakeCert(&newCert, derBuf, sizeof(derBuf), &rsaKey, NULL, rng);
}
if (ret <= 0) {
fprintf(stderr, "Make Cert failed: %d\n", ret);
return ret;
}
if (type == EC_KEY_TYPE) {
ret = wc_SignCert(newCert.bodySz, newCert.sigType, derBuf, sizeof(derBuf),
NULL, &ecKey, rng);
} else {
ret = wc_SignCert(newCert.bodySz, newCert.sigType, derBuf, sizeof(derBuf),
&rsaKey, NULL, rng);
}
if (ret <= 0) {
fprintf(stderr, "Sign Cert failed: %d\n", ret);
return ret;
}
derSz = ret;
ret = wc_DerToPem(derBuf, derSz, pemBuf, sizeof(pemBuf), CERT_TYPE);
if (ret <= 0) {
fprintf(stderr, "DER to PEM failed: %d\n", ret);
return ret;
}
pemSz = ret;
ret = write_file(pemBuf, pemSz, certpath);
if (ret != 0) {
fprintf(stderr, "Write Cert failed: %d\n", ret);
return ret;
}
if (type == EC_KEY_TYPE) {
wc_ecc_free(&ecKey);
} else {
wc_FreeRsaKey(&rsaKey);
}
return 0;
}
int dokey(WC_RNG *rng, int type, char **arg) {
ecc_key ecKey;
RsaKey rsaKey;
int ret;
int curve = ECC_SECP256R1;
int keySz = WOLFSSL_MIN_RSA_BITS;
int exp = WC_RSA_EXPONENT;
char *path = NULL;
bool pem = true;
while (*arg && **arg == '-') {
if (!strncmp(*arg, "-out", 4) && arg[1]) {
path = arg[1];
arg++;
} else if (!strncmp(*arg, "-3", 2)) {
exp = 3;
} else if (!strncmp(*arg, "-der", 4)) {
pem = false;
}
arg++;
}
if (*arg && type == RSA_KEY_TYPE) {
keySz = (unsigned int)atoi(*arg);
} else if (*arg) {
if (!strncmp(*arg, "P-256", 5)) {
curve = ECC_SECP256R1;
} else if (!strncmp(*arg, "P-384", 5)) {
curve = ECC_SECP384R1;
} else if (!strncmp(*arg, "P-521", 5)) {
curve = ECC_SECP521R1;
} else {
fprintf(stderr, "Invalid Curve Name: %s\n", *arg);
return 1;
}
}
ret = gen_key(rng, &ecKey, &rsaKey, type, keySz, exp, curve);
if (ret != 0)
return ret;
ret = write_key(&ecKey, &rsaKey, type, keySz, path, pem);
if (type == EC_KEY_TYPE) {
wc_ecc_free(&ecKey);
} else {
wc_FreeRsaKey(&rsaKey);
}
return ret;
}
int main(int argc, char *argv[]) {
int ret;
WC_RNG rng;
ret = wc_InitRng(&rng);
if (ret != 0) {
fprintf(stderr, "Init Rng failed: %d\n", ret);
return ret;
}
if (argv[1]) {
if (!strncmp(argv[1], "eckey", 5))
return dokey(&rng, EC_KEY_TYPE, argv + 2);
if (!strncmp(argv[1], "rsakey", 5))
return dokey(&rng, RSA_KEY_TYPE, argv + 2);
if (!strncmp(argv[1], "selfsigned", 10))
return selfsigned(&rng, argv + 2);
}
fprintf(stderr, "PX5G X.509 Certificate Generator Utilit using WolfSSL\n\n");
fprintf(stderr, "Usage: [eckey|rsakey|selfsigned]\n");
return 1;
}