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/* $OpenBSD: ssl.c,v 1.35 2021/01/27 20:33:05 eric Exp $ */
/*
* Copyright (c) 2007 - 2014 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <unistd.h>
#include <string.h>
#include <imsg.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/engine.h>
#include "relayd.h"
int ssl_password_cb(char *, int, int, void *);
void
ssl_init(struct relayd *env)
{
static int initialized = 0;
if (initialized)
return;
SSL_library_init();
SSL_load_error_strings();
/* Init hardware crypto engines. */
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
initialized = 1;
}
int
ssl_password_cb(char *buf, int size, int rwflag, void *u)
{
size_t len;
if (u == NULL) {
bzero(buf, size);
return (0);
}
if ((len = strlcpy(buf, u, size)) >= (size_t)size)
return (0);
return (len);
}
char *
ssl_load_key(struct relayd *env, const char *name, off_t *len, char *pass)
{
FILE *fp;
EVP_PKEY *key = NULL;
BIO *bio = NULL;
long size;
char *data, *buf = NULL;
/* Initialize SSL library once */
ssl_init(env);
/*
* Read (possibly) encrypted key from file
*/
if ((fp = fopen(name, "r")) == NULL)
return (NULL);
key = PEM_read_PrivateKey(fp, NULL, ssl_password_cb, pass);
fclose(fp);
if (key == NULL)
goto fail;
/*
* Write unencrypted key to memory buffer
*/
if ((bio = BIO_new(BIO_s_mem())) == NULL)
goto fail;
if (!PEM_write_bio_PrivateKey(bio, key, NULL, NULL, 0, NULL, NULL))
goto fail;
if ((size = BIO_get_mem_data(bio, &data)) <= 0)
goto fail;
if ((buf = calloc(1, size)) == NULL)
goto fail;
memcpy(buf, data, size);
BIO_free_all(bio);
EVP_PKEY_free(key);
*len = (off_t)size;
return (buf);
fail:
free(buf);
if (bio != NULL)
BIO_free_all(bio);
if (key != NULL)
EVP_PKEY_free(key);
return (NULL);
}
uint8_t *
ssl_update_certificate(const uint8_t *oldcert, size_t oldlen, EVP_PKEY *pkey,
EVP_PKEY *capkey, X509 *cacert, size_t *newlen)
{
char name[2][TLS_NAME_SIZE];
BIO *in, *out = NULL;
BUF_MEM *bptr = NULL;
X509 *cert = NULL;
uint8_t *newcert = NULL, *foo = NULL;
/* XXX BIO_new_mem_buf is not using const so work around this */
if ((foo = malloc(oldlen)) == NULL) {
log_warn("%s: malloc", __func__);
return (NULL);
}
memcpy(foo, oldcert, oldlen);
if ((in = BIO_new_mem_buf(foo, oldlen)) == NULL) {
log_warnx("%s: BIO_new_mem_buf failed", __func__);
goto done;
}
if ((cert = PEM_read_bio_X509(in, NULL,
ssl_password_cb, NULL)) == NULL) {
log_warnx("%s: PEM_read_bio_X509 failed", __func__);
goto done;
}
BIO_free(in);
in = NULL;
name[0][0] = name[1][0] = '\0';
if (!X509_NAME_oneline(X509_get_subject_name(cert),
name[0], sizeof(name[0])) ||
!X509_NAME_oneline(X509_get_issuer_name(cert),
name[1], sizeof(name[1])))
goto done;
if ((cert = X509_dup(cert)) == NULL)
goto done;
/* Update certificate key and use our CA as the issuer */
X509_set_pubkey(cert, pkey);
X509_set_issuer_name(cert, X509_get_subject_name(cacert));
/* Sign with our CA */
if (!X509_sign(cert, capkey, EVP_sha256())) {
log_warnx("%s: X509_sign failed", __func__);
goto done;
}
#if DEBUG_CERT
log_debug("%s: subject %s", __func__, name[0]);
log_debug("%s: issuer %s", __func__, name[1]);
#if DEBUG > 2
X509_print_fp(stdout, cert);
#endif
#endif
/* write cert as PEM file */
out = BIO_new(BIO_s_mem());
if (out == NULL) {
log_warnx("%s: BIO_new failed", __func__);
goto done;
}
if (!PEM_write_bio_X509(out, cert)) {
log_warnx("%s: PEM_write_bio_X509 failed", __func__);
goto done;
}
BIO_get_mem_ptr(out, &bptr);
if ((newcert = malloc(bptr->length)) == NULL) {
log_warn("%s: malloc", __func__);
goto done;
}
memcpy(newcert, bptr->data, bptr->length);
*newlen = bptr->length;
done:
free(foo);
if (in)
BIO_free(in);
if (out)
BIO_free(out);
if (cert)
X509_free(cert);
return (newcert);
}
int
ssl_load_pkey(char *buf, off_t len, X509 **x509ptr, EVP_PKEY **pkeyptr)
{
BIO *in;
X509 *x509 = NULL;
EVP_PKEY *pkey = NULL;
RSA *rsa = NULL;
char *hash = NULL;
if ((in = BIO_new_mem_buf(buf, len)) == NULL) {
log_warnx("%s: BIO_new_mem_buf failed", __func__);
return (0);
}
if ((x509 = PEM_read_bio_X509(in, NULL,
ssl_password_cb, NULL)) == NULL) {
log_warnx("%s: PEM_read_bio_X509 failed", __func__);
goto fail;
}
if ((pkey = X509_get_pubkey(x509)) == NULL) {
log_warnx("%s: X509_get_pubkey failed", __func__);
goto fail;
}
if ((rsa = EVP_PKEY_get1_RSA(pkey)) == NULL) {
log_warnx("%s: failed to extract RSA", __func__);
goto fail;
}
if ((hash = malloc(TLS_CERT_HASH_SIZE)) == NULL) {
log_warn("%s: allocate hash failed", __func__);
goto fail;
}
hash_x509(x509, hash, TLS_CERT_HASH_SIZE);
if (RSA_set_ex_data(rsa, 0, hash) != 1) {
log_warnx("%s: failed to set hash as exdata", __func__);
goto fail;
}
RSA_free(rsa); /* dereference, will be cleaned up with pkey */
*pkeyptr = pkey;
if (x509ptr != NULL)
*x509ptr = x509;
else
X509_free(x509);
BIO_free(in);
return (1);
fail:
free(hash);
if (rsa != NULL)
RSA_free(rsa);
if (pkey != NULL)
EVP_PKEY_free(pkey);
if (x509 != NULL)
X509_free(x509);
BIO_free(in);
return (0);
}
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