mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-27 01:38:37 -05:00
0f3d578efc
Remove the GPL notification text from the files that were initially contributed by myself. Signed-hostap: Jouni Malinen <j@w1.fi>
646 lines
14 KiB
C
646 lines
14 KiB
C
/*
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* SSL/TLS interface functions for NSS
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include <nspr/prtypes.h>
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#include <nspr/plarenas.h>
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#include <nspr/plhash.h>
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#include <nspr/prio.h>
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#include <nspr/prclist.h>
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#include <nspr/prlock.h>
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#include <nspr/prinit.h>
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#include <nspr/prerror.h>
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#include <nspr/prmem.h>
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#include <nss/nss.h>
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#include <nss/nssilckt.h>
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#include <nss/ssl.h>
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#include <nss/pk11func.h>
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#include <nss/secerr.h>
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#include "common.h"
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#include "tls.h"
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static int tls_nss_ref_count = 0;
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static PRDescIdentity nss_layer_id;
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struct tls_connection {
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PRFileDesc *fd;
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int established;
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int verify_peer;
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u8 *push_buf, *pull_buf, *pull_buf_offset;
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size_t push_buf_len, pull_buf_len;
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};
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static PRStatus nss_io_close(PRFileDesc *fd)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O close");
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return PR_SUCCESS;
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}
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static PRInt32 nss_io_read(PRFileDesc *fd, void *buf, PRInt32 amount)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O read(%d)", amount);
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return PR_FAILURE;
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}
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static PRInt32 nss_io_write(PRFileDesc *fd, const void *buf, PRInt32 amount)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O write(%d)", amount);
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return PR_FAILURE;
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}
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static PRInt32 nss_io_writev(PRFileDesc *fd, const PRIOVec *iov,
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PRInt32 iov_size, PRIntervalTime timeout)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O writev(%d)", iov_size);
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return PR_FAILURE;
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}
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static PRInt32 nss_io_recv(PRFileDesc *fd, void *buf, PRInt32 amount,
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PRIntn flags, PRIntervalTime timeout)
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{
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struct tls_connection *conn = (struct tls_connection *) fd->secret;
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u8 *end;
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wpa_printf(MSG_DEBUG, "NSS: I/O recv(%d)", amount);
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if (conn->pull_buf == NULL) {
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wpa_printf(MSG_DEBUG, "NSS: No data available to be read yet");
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return PR_FAILURE;
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}
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end = conn->pull_buf + conn->pull_buf_len;
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if (end - conn->pull_buf_offset < amount)
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amount = end - conn->pull_buf_offset;
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os_memcpy(buf, conn->pull_buf_offset, amount);
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conn->pull_buf_offset += amount;
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if (conn->pull_buf_offset == end) {
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wpa_printf(MSG_DEBUG, "%s - pull_buf consumed", __func__);
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os_free(conn->pull_buf);
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conn->pull_buf = conn->pull_buf_offset = NULL;
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conn->pull_buf_len = 0;
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} else {
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wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in pull_buf",
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__func__,
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(unsigned long) (end - conn->pull_buf_offset));
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}
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return amount;
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}
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static PRInt32 nss_io_send(PRFileDesc *fd, const void *buf, PRInt32 amount,
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PRIntn flags, PRIntervalTime timeout)
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{
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struct tls_connection *conn = (struct tls_connection *) fd->secret;
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u8 *nbuf;
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wpa_printf(MSG_DEBUG, "NSS: I/O %s", __func__);
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wpa_hexdump(MSG_MSGDUMP, "NSS: I/O send data", buf, amount);
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nbuf = os_realloc(conn->push_buf, conn->push_buf_len + amount);
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if (nbuf == NULL) {
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wpa_printf(MSG_ERROR, "NSS: Failed to allocate memory for the "
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"data to be sent");
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return PR_FAILURE;
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}
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os_memcpy(nbuf + conn->push_buf_len, buf, amount);
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conn->push_buf = nbuf;
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conn->push_buf_len += amount;
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return amount;
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}
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static PRInt32 nss_io_recvfrom(PRFileDesc *fd, void *buf, PRInt32 amount,
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PRIntn flags, PRNetAddr *addr,
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PRIntervalTime timeout)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O %s", __func__);
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return PR_FAILURE;
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}
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static PRInt32 nss_io_sendto(PRFileDesc *fd, const void *buf, PRInt32 amount,
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PRIntn flags, const PRNetAddr *addr,
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PRIntervalTime timeout)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O %s", __func__);
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return PR_FAILURE;
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}
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static PRStatus nss_io_getpeername(PRFileDesc *fd, PRNetAddr *addr)
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{
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wpa_printf(MSG_DEBUG, "NSS: I/O getpeername");
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/*
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* It Looks like NSS only supports IPv4 and IPv6 TCP sockets. Provide a
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* fake IPv4 address to work around this even though we are not really
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* using TCP.
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*/
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os_memset(addr, 0, sizeof(*addr));
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addr->inet.family = PR_AF_INET;
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return PR_SUCCESS;
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}
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static PRStatus nss_io_getsocketoption(PRFileDesc *fd,
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PRSocketOptionData *data)
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{
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switch (data->option) {
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case PR_SockOpt_Nonblocking:
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wpa_printf(MSG_DEBUG, "NSS: I/O getsocketoption(Nonblocking)");
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data->value.non_blocking = PR_TRUE;
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return PR_SUCCESS;
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default:
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wpa_printf(MSG_DEBUG, "NSS: I/O getsocketoption(%d)",
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data->option);
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return PR_FAILURE;
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}
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}
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static const PRIOMethods nss_io = {
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PR_DESC_LAYERED,
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nss_io_close,
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nss_io_read,
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nss_io_write,
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NULL /* available */,
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NULL /* available64 */,
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NULL /* fsync */,
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NULL /* fseek */,
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NULL /* fseek64 */,
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NULL /* fileinfo */,
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NULL /* fileinfo64 */,
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nss_io_writev,
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NULL /* connect */,
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NULL /* accept */,
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NULL /* bind */,
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NULL /* listen */,
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NULL /* shutdown */,
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nss_io_recv,
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nss_io_send,
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nss_io_recvfrom,
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nss_io_sendto,
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NULL /* poll */,
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NULL /* acceptread */,
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NULL /* transmitfile */,
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NULL /* getsockname */,
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nss_io_getpeername,
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NULL /* reserved_fn_6 */,
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NULL /* reserved_fn_5 */,
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nss_io_getsocketoption,
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NULL /* setsocketoption */,
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NULL /* sendfile */,
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NULL /* connectcontinue */,
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NULL /* reserved_fn_3 */,
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NULL /* reserved_fn_2 */,
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NULL /* reserved_fn_1 */,
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NULL /* reserved_fn_0 */
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};
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static char * nss_password_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
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{
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wpa_printf(MSG_ERROR, "NSS: TODO - %s", __func__);
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return NULL;
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}
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void * tls_init(const struct tls_config *conf)
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{
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char *dir;
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tls_nss_ref_count++;
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if (tls_nss_ref_count > 1)
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return (void *) 1;
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PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1);
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nss_layer_id = PR_GetUniqueIdentity("wpa_supplicant");
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PK11_SetPasswordFunc(nss_password_cb);
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dir = getenv("SSL_DIR");
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if (dir) {
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if (NSS_Init(dir) != SECSuccess) {
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wpa_printf(MSG_ERROR, "NSS: NSS_Init(cert_dir=%s) "
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"failed", dir);
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return NULL;
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}
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} else {
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if (NSS_NoDB_Init(NULL) != SECSuccess) {
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wpa_printf(MSG_ERROR, "NSS: NSS_NoDB_Init(NULL) "
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"failed");
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return NULL;
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}
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}
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if (SSL_OptionSetDefault(SSL_V2_COMPATIBLE_HELLO, PR_FALSE) !=
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SECSuccess ||
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SSL_OptionSetDefault(SSL_ENABLE_SSL3, PR_FALSE) != SECSuccess ||
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SSL_OptionSetDefault(SSL_ENABLE_SSL2, PR_FALSE) != SECSuccess ||
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SSL_OptionSetDefault(SSL_ENABLE_TLS, PR_TRUE) != SECSuccess) {
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wpa_printf(MSG_ERROR, "NSS: SSL_OptionSetDefault failed");
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return NULL;
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}
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if (NSS_SetDomesticPolicy() != SECSuccess) {
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wpa_printf(MSG_ERROR, "NSS: NSS_SetDomesticPolicy() failed");
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return NULL;
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}
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return (void *) 1;
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}
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void tls_deinit(void *ssl_ctx)
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{
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tls_nss_ref_count--;
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if (tls_nss_ref_count == 0) {
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if (NSS_Shutdown() != SECSuccess)
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wpa_printf(MSG_ERROR, "NSS: NSS_Shutdown() failed");
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}
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}
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int tls_get_errors(void *tls_ctx)
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{
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return 0;
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}
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static SECStatus nss_bad_cert_cb(void *arg, PRFileDesc *fd)
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{
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struct tls_connection *conn = arg;
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SECStatus res = SECSuccess;
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PRErrorCode err;
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CERTCertificate *cert;
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char *subject, *issuer;
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err = PR_GetError();
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if (IS_SEC_ERROR(err))
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wpa_printf(MSG_DEBUG, "NSS: Bad Server Certificate (sec err "
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"%d)", err - SEC_ERROR_BASE);
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else
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wpa_printf(MSG_DEBUG, "NSS: Bad Server Certificate (err %d)",
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err);
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cert = SSL_PeerCertificate(fd);
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subject = CERT_NameToAscii(&cert->subject);
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issuer = CERT_NameToAscii(&cert->issuer);
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wpa_printf(MSG_DEBUG, "NSS: Peer certificate subject='%s' issuer='%s'",
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subject, issuer);
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CERT_DestroyCertificate(cert);
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PR_Free(subject);
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PR_Free(issuer);
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if (conn->verify_peer)
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res = SECFailure;
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return res;
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}
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static void nss_handshake_cb(PRFileDesc *fd, void *client_data)
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{
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struct tls_connection *conn = client_data;
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wpa_printf(MSG_DEBUG, "NSS: Handshake completed");
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conn->established = 1;
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}
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struct tls_connection * tls_connection_init(void *tls_ctx)
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{
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struct tls_connection *conn;
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conn = os_zalloc(sizeof(*conn));
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if (conn == NULL)
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return NULL;
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conn->fd = PR_CreateIOLayerStub(nss_layer_id, &nss_io);
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if (conn->fd == NULL) {
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os_free(conn);
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return NULL;
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}
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conn->fd->secret = (void *) conn;
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conn->fd = SSL_ImportFD(NULL, conn->fd);
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if (conn->fd == NULL) {
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os_free(conn);
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return NULL;
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}
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if (SSL_OptionSet(conn->fd, SSL_SECURITY, PR_TRUE) != SECSuccess ||
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SSL_OptionSet(conn->fd, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE) !=
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SECSuccess ||
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SSL_OptionSet(conn->fd, SSL_HANDSHAKE_AS_SERVER, PR_FALSE) !=
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SECSuccess ||
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SSL_OptionSet(conn->fd, SSL_ENABLE_TLS, PR_TRUE) != SECSuccess ||
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SSL_BadCertHook(conn->fd, nss_bad_cert_cb, conn) != SECSuccess ||
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SSL_HandshakeCallback(conn->fd, nss_handshake_cb, conn) !=
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SECSuccess) {
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wpa_printf(MSG_ERROR, "NSS: Failed to set options");
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PR_Close(conn->fd);
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os_free(conn);
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return NULL;
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}
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SSL_ResetHandshake(conn->fd, PR_FALSE);
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return conn;
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}
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void tls_connection_deinit(void *tls_ctx, struct tls_connection *conn)
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{
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PR_Close(conn->fd);
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os_free(conn->push_buf);
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os_free(conn->pull_buf);
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os_free(conn);
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}
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int tls_connection_established(void *tls_ctx, struct tls_connection *conn)
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{
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return conn->established;
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}
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int tls_connection_shutdown(void *tls_ctx, struct tls_connection *conn)
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{
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return -1;
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}
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int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
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const struct tls_connection_params *params)
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{
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wpa_printf(MSG_ERROR, "NSS: TODO - %s", __func__);
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return 0;
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}
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int tls_global_set_params(void *tls_ctx,
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const struct tls_connection_params *params)
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{
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return -1;
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}
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int tls_global_set_verify(void *tls_ctx, int check_crl)
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{
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return -1;
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}
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int tls_connection_set_verify(void *tls_ctx, struct tls_connection *conn,
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int verify_peer)
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{
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conn->verify_peer = verify_peer;
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return 0;
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}
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int tls_connection_get_keys(void *tls_ctx, struct tls_connection *conn,
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struct tls_keys *keys)
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{
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/* NSS does not export master secret or client/server random. */
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return -1;
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}
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int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
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const char *label, int server_random_first,
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u8 *out, size_t out_len)
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{
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if (conn == NULL || server_random_first) {
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wpa_printf(MSG_INFO, "NSS: Unsupported PRF request "
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"(server_random_first=%d)",
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server_random_first);
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return -1;
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}
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if (SSL_ExportKeyingMaterial(conn->fd, label, NULL, 0, out, out_len) !=
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SECSuccess) {
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wpa_printf(MSG_INFO, "NSS: Failed to use TLS extractor "
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"(label='%s' out_len=%d", label, (int) out_len);
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return -1;
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}
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return 0;
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}
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struct wpabuf * tls_connection_handshake(void *tls_ctx,
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struct tls_connection *conn,
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const struct wpabuf *in_data,
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struct wpabuf **appl_data)
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{
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struct wpabuf *out_data;
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wpa_printf(MSG_DEBUG, "NSS: handshake: in_len=%u",
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in_data ? (unsigned int) wpabuf_len(in_data) : 0);
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if (appl_data)
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*appl_data = NULL;
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if (in_data && wpabuf_len(in_data) > 0) {
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if (conn->pull_buf) {
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wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
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"pull_buf", __func__,
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(unsigned long) conn->pull_buf_len);
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os_free(conn->pull_buf);
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}
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conn->pull_buf = os_malloc(wpabuf_len(in_data));
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if (conn->pull_buf == NULL)
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return NULL;
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os_memcpy(conn->pull_buf, wpabuf_head(in_data),
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wpabuf_len(in_data));
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conn->pull_buf_offset = conn->pull_buf;
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conn->pull_buf_len = wpabuf_len(in_data);
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}
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SSL_ForceHandshake(conn->fd);
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if (conn->established && conn->push_buf == NULL) {
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/* Need to return something to get final TLS ACK. */
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conn->push_buf = os_malloc(1);
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}
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if (conn->push_buf == NULL)
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return NULL;
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out_data = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
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if (out_data == NULL)
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os_free(conn->push_buf);
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conn->push_buf = NULL;
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conn->push_buf_len = 0;
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return out_data;
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}
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struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
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struct tls_connection *conn,
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const struct wpabuf *in_data,
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struct wpabuf **appl_data)
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{
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return NULL;
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}
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struct wpabuf * tls_connection_encrypt(void *tls_ctx,
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struct tls_connection *conn,
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const struct wpabuf *in_data)
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{
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PRInt32 res;
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struct wpabuf *buf;
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wpa_printf(MSG_DEBUG, "NSS: encrypt %d bytes",
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(int) wpabuf_len(in_data));
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res = PR_Send(conn->fd, wpabuf_head(in_data), wpabuf_len(in_data), 0,
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0);
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if (res < 0) {
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wpa_printf(MSG_ERROR, "NSS: Encryption failed");
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return NULL;
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}
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if (conn->push_buf == NULL)
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return NULL;
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buf = wpabuf_alloc_ext_data(conn->push_buf, conn->push_buf_len);
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if (buf == NULL)
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os_free(conn->push_buf);
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conn->push_buf = NULL;
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conn->push_buf_len = 0;
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return buf;
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|
}
|
|
|
|
|
|
struct wpabuf * tls_connection_decrypt(void *tls_ctx,
|
|
struct tls_connection *conn,
|
|
const struct wpabuf *in_data)
|
|
{
|
|
PRInt32 res;
|
|
struct wpabuf *out;
|
|
|
|
wpa_printf(MSG_DEBUG, "NSS: decrypt %d bytes",
|
|
(int) wpabuf_len(in_data));
|
|
if (conn->pull_buf) {
|
|
wpa_printf(MSG_DEBUG, "%s - %lu bytes remaining in "
|
|
"pull_buf", __func__,
|
|
(unsigned long) conn->pull_buf_len);
|
|
os_free(conn->pull_buf);
|
|
}
|
|
conn->pull_buf = os_malloc(wpabuf_len(in_data));
|
|
if (conn->pull_buf == NULL)
|
|
return NULL;
|
|
os_memcpy(conn->pull_buf, wpabuf_head(in_data), wpabuf_len(in_data));
|
|
conn->pull_buf_offset = conn->pull_buf;
|
|
conn->pull_buf_len = wpabuf_len(in_data);
|
|
|
|
/*
|
|
* Even though we try to disable TLS compression, it is possible that
|
|
* this cannot be done with all TLS libraries. Add extra buffer space
|
|
* to handle the possibility of the decrypted data being longer than
|
|
* input data.
|
|
*/
|
|
out = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
|
|
if (out == NULL)
|
|
return NULL;
|
|
|
|
res = PR_Recv(conn->fd, wpabuf_mhead(out), wpabuf_size(out), 0, 0);
|
|
wpa_printf(MSG_DEBUG, "NSS: PR_Recv: %d", res);
|
|
if (res < 0) {
|
|
wpabuf_free(out);
|
|
return NULL;
|
|
}
|
|
wpabuf_put(out, res);
|
|
|
|
return out;
|
|
}
|
|
|
|
|
|
int tls_connection_resumed(void *tls_ctx, struct tls_connection *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
|
|
u8 *ciphers)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
|
|
int tls_get_cipher(void *tls_ctx, struct tls_connection *conn,
|
|
char *buf, size_t buflen)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
|
|
int tls_connection_enable_workaround(void *tls_ctx,
|
|
struct tls_connection *conn)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
|
|
int tls_connection_client_hello_ext(void *tls_ctx, struct tls_connection *conn,
|
|
int ext_type, const u8 *data,
|
|
size_t data_len)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
|
|
int tls_connection_get_failed(void *tls_ctx, struct tls_connection *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tls_connection_get_read_alerts(void *tls_ctx, struct tls_connection *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tls_connection_get_write_alerts(void *tls_ctx,
|
|
struct tls_connection *conn)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tls_connection_get_keyblock_size(void *tls_ctx,
|
|
struct tls_connection *conn)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
|
|
unsigned int tls_capabilities(void *tls_ctx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
int tls_connection_set_session_ticket_cb(void *tls_ctx,
|
|
struct tls_connection *conn,
|
|
tls_session_ticket_cb cb,
|
|
void *ctx)
|
|
{
|
|
return -1;
|
|
}
|