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/* $OpenBSD: tls_util.c,v 1.16 2023/05/14 07:26:25 op Exp $ */
/*
* Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
* Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
* Copyright (c) 2015 Reyk Floeter <reyk@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/stat.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "tls.h"
#include "tls_internal.h"
static void *
memdup(const void *in, size_t len)
{
void *out;
if ((out = malloc(len)) == NULL)
return NULL;
memcpy(out, in, len);
return out;
}
int
tls_set_mem(char **dest, size_t *destlen, const void *src, size_t srclen)
{
free(*dest);
*dest = NULL;
*destlen = 0;
if (src != NULL) {
if ((*dest = memdup(src, srclen)) == NULL)
return -1;
*destlen = srclen;
}
return 0;
}
int
tls_set_string(const char **dest, const char *src)
{
free((char *)*dest);
*dest = NULL;
if (src != NULL)
if ((*dest = strdup(src)) == NULL)
return -1;
return 0;
}
/*
* Extract the host and port from a colon separated value. For a literal IPv6
* address the address must be contained with square braces. If a host and
* port are successfully extracted, the function will return 0 and the
* caller is responsible for freeing the host and port. If no port is found
* then the function will return 1, with both host and port being NULL.
* On memory allocation failure -1 will be returned.
*/
int
tls_host_port(const char *hostport, char **host, char **port)
{
char *h, *p, *s;
int rv = 1;
*host = NULL;
*port = NULL;
if ((s = strdup(hostport)) == NULL)
goto err;
h = p = s;
/* See if this is an IPv6 literal with square braces. */
if (p[0] == '[') {
h++;
if ((p = strchr(s, ']')) == NULL)
goto done;
*p++ = '\0';
}
/* Find the port separator. */
if ((p = strchr(p, ':')) == NULL)
goto done;
/* If there is another separator then we have issues. */
if (strchr(p + 1, ':') != NULL)
goto done;
*p++ = '\0';
if (asprintf(host, "%s", h) == -1) {
*host = NULL;
goto err;
}
if (asprintf(port, "%s", p) == -1) {
*port = NULL;
goto err;
}
rv = 0;
goto done;
err:
free(*host);
*host = NULL;
free(*port);
*port = NULL;
rv = -1;
done:
free(s);
return (rv);
}
int
tls_password_cb(char *buf, int size, int rwflag, void *u)
{
size_t len;
if (size < 0)
return (0);
if (u == NULL) {
memset(buf, 0, size);
return (0);
}
if ((len = strlcpy(buf, u, size)) >= (size_t)size)
return (0);
return (len);
}
uint8_t *
tls_load_file(const char *name, size_t *len, char *password)
{
FILE *fp;
EVP_PKEY *key = NULL;
BIO *bio = NULL;
char *data;
uint8_t *buf = NULL;
struct stat st;
size_t size = 0;
int fd = -1;
ssize_t n;
*len = 0;
if ((fd = open(name, O_RDONLY)) == -1)
return (NULL);
/* Just load the file into memory without decryption */
if (password == NULL) {
if (fstat(fd, &st) != 0)
goto err;
if (st.st_size < 0)
goto err;
size = (size_t)st.st_size;
if ((buf = malloc(size)) == NULL)
goto err;
n = read(fd, buf, size);
if (n < 0 || (size_t)n != size)
goto err;
close(fd);
goto done;
}
/* Or read the (possibly) encrypted key from file */
if ((fp = fdopen(fd, "r")) == NULL)
goto err;
fd = -1;
key = PEM_read_PrivateKey(fp, NULL, tls_password_cb, password);
fclose(fp);
if (key == NULL)
goto err;
/* Write unencrypted key to memory buffer */
if ((bio = BIO_new(BIO_s_mem())) == NULL)
goto err;
if (!PEM_write_bio_PrivateKey(bio, key, NULL, NULL, 0, NULL, NULL))
goto err;
if ((size = BIO_get_mem_data(bio, &data)) <= 0)
goto err;
if ((buf = malloc(size)) == NULL)
goto err;
memcpy(buf, data, size);
BIO_free_all(bio);
EVP_PKEY_free(key);
done:
*len = size;
return (buf);
err:
if (fd != -1)
close(fd);
freezero(buf, size);
BIO_free_all(bio);
EVP_PKEY_free(key);
return (NULL);
}
void
tls_unload_file(uint8_t *buf, size_t len)
{
freezero(buf, len);
}
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