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BearSSL/tools/sslio.c

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/*
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#define SOCKET int
#define INVALID_SOCKET (-1)
#endif
#include "brssl.h"
static void
dump_blob(const char *name, const void *data, size_t len)
{
const unsigned char *buf;
size_t u;
buf = data;
fprintf(stderr, "%s (len = %lu)", name, (unsigned long)len);
for (u = 0; u < len; u ++) {
if ((u & 15) == 0) {
fprintf(stderr, "\n%08lX ", (unsigned long)u);
} else if ((u & 7) == 0) {
fprintf(stderr, " ");
}
fprintf(stderr, " %02x", buf[u]);
}
fprintf(stderr, "\n");
}
/*
* Inspect the provided data in case it is a "command" to trigger a
* special behaviour. If the command is recognised, then it is executed
* and this function returns 1. Otherwise, this function returns 0.
*/
static int
run_command(br_ssl_engine_context *cc, unsigned char *buf, size_t len)
{
/*
* A single static slot for saving session parameters.
*/
static br_ssl_session_parameters slot;
static int slot_used = 0;
size_t u;
if (len < 2 || len > 3) {
return 0;
}
if (len == 3 && (buf[1] != '\r' || buf[2] != '\n')) {
return 0;
}
if (len == 2 && buf[1] != '\n') {
return 0;
}
switch (buf[0]) {
case 'Q':
fprintf(stderr, "closing...\n");
br_ssl_engine_close(cc);
return 1;
case 'R':
if (br_ssl_engine_renegotiate(cc)) {
fprintf(stderr, "renegotiating...\n");
} else {
fprintf(stderr, "not renegotiating.\n");
}
return 1;
case 'F':
/*
* Session forget is nominally client-only. But the
* session parameters are in the engine structure, which
* is the first field of the client context, so the cast
* still works properly. On the server, this forgetting
* has no effect.
*/
fprintf(stderr, "forgetting session...\n");
br_ssl_client_forget_session((br_ssl_client_context *)cc);
return 1;
case 'S':
fprintf(stderr, "saving session parameters...\n");
br_ssl_engine_get_session_parameters(cc, &slot);
fprintf(stderr, " id = ");
for (u = 0; u < slot.session_id_len; u ++) {
fprintf(stderr, "%02X", slot.session_id[u]);
}
fprintf(stderr, "\n");
slot_used = 1;
return 1;
case 'P':
if (slot_used) {
fprintf(stderr, "restoring session parameters...\n");
fprintf(stderr, " id = ");
for (u = 0; u < slot.session_id_len; u ++) {
fprintf(stderr, "%02X", slot.session_id[u]);
}
fprintf(stderr, "\n");
br_ssl_engine_set_session_parameters(cc, &slot);
return 1;
}
return 0;
default:
return 0;
}
}
#ifdef _WIN32
typedef struct {
unsigned char buf[1024];
size_t ptr, len;
} in_buffer;
static int
in_return_bytes(in_buffer *bb, unsigned char *buf, size_t len)
{
if (bb->ptr < bb->len) {
size_t clen;
if (buf == NULL) {
return 1;
}
clen = bb->len - bb->ptr;
if (clen > len) {
clen = len;
}
memcpy(buf, bb->buf + bb->ptr, clen);
bb->ptr += clen;
if (bb->ptr == bb->len) {
bb->ptr = bb->len = 0;
}
return (int)clen;
}
return 0;
}
/*
* A buffered version of in_read(), using a buffer to return only
* full lines when feasible.
*/
static int
in_read_buffered(HANDLE h_in, in_buffer *bb, unsigned char *buf, size_t len)
{
int n;
if (len == 0) {
return 0;
}
n = in_return_bytes(bb, buf, len);
if (n != 0) {
return n;
}
for (;;) {
INPUT_RECORD inrec;
DWORD v;
if (!PeekConsoleInput(h_in, &inrec, 1, &v)) {
fprintf(stderr, "ERROR: PeekConsoleInput()"
" failed with 0x%08lX\n",
(unsigned long)GetLastError());
return -1;
}
if (v == 0) {
return 0;
}
if (!ReadConsoleInput(h_in, &inrec, 1, &v)) {
fprintf(stderr, "ERROR: ReadConsoleInput()"
" failed with 0x%08lX\n",
(unsigned long)GetLastError());
return -1;
}
if (v == 0) {
return 0;
}
if (inrec.EventType == KEY_EVENT
&& inrec.Event.KeyEvent.bKeyDown)
{
int c;
c = inrec.Event.KeyEvent.uChar.AsciiChar;
if (c == '\n' || c == '\r' || c == '\t'
|| (c >= 32 && c != 127))
{
if (c == '\r') {
c = '\n';
}
bb->buf[bb->ptr ++] = (unsigned char)c;
printf("%c", c);
fflush(stdout);
bb->len = bb->ptr;
if (bb->len == sizeof bb->buf || c == '\n') {
bb->ptr = 0;
return in_return_bytes(bb, buf, len);
}
}
}
}
}
static int
in_avail_buffered(HANDLE h_in, in_buffer *bb)
{
return in_read_buffered(h_in, bb, NULL, 1);
}
#endif
/* see brssl.h */
int
run_ssl_engine(br_ssl_engine_context *cc, unsigned long fd, unsigned flags)
{
int hsdetails;
int retcode;
int verbose;
int trace;
#ifdef _WIN32
WSAEVENT fd_event;
int can_send, can_recv;
HANDLE h_in, h_out;
in_buffer bb;
#endif
hsdetails = 0;
retcode = 0;
verbose = (flags & RUN_ENGINE_VERBOSE) != 0;
trace = (flags & RUN_ENGINE_TRACE) != 0;
/*
* Print algorithm details.
*/
if (verbose) {
const char *rngname;
fprintf(stderr, "Algorithms:\n");
br_prng_seeder_system(&rngname);
fprintf(stderr, " RNG: %s\n", rngname);
if (cc->iaes_cbcenc != 0) {
fprintf(stderr, " AES/CBC (enc): %s\n",
get_algo_name(cc->iaes_cbcenc, 0));
}
if (cc->iaes_cbcdec != 0) {
fprintf(stderr, " AES/CBC (dec): %s\n",
get_algo_name(cc->iaes_cbcdec, 0));
}
if (cc->iaes_ctr != 0) {
fprintf(stderr, " AES/CTR: %s\n",
get_algo_name(cc->iaes_cbcdec, 0));
}
if (cc->iaes_ctrcbc != 0) {
fprintf(stderr, " AES/CCM: %s\n",
get_algo_name(cc->iaes_ctrcbc, 0));
}
if (cc->ides_cbcenc != 0) {
fprintf(stderr, " DES/CBC (enc): %s\n",
get_algo_name(cc->ides_cbcenc, 0));
}
if (cc->ides_cbcdec != 0) {
fprintf(stderr, " DES/CBC (dec): %s\n",
get_algo_name(cc->ides_cbcdec, 0));
}
if (cc->ighash != 0) {
fprintf(stderr, " GHASH (GCM): %s\n",
get_algo_name(cc->ighash, 0));
}
if (cc->ichacha != 0) {
fprintf(stderr, " ChaCha20: %s\n",
get_algo_name(cc->ichacha, 0));
}
if (cc->ipoly != 0) {
fprintf(stderr, " Poly1305: %s\n",
get_algo_name(cc->ipoly, 0));
}
if (cc->iec != 0) {
fprintf(stderr, " EC: %s\n",
get_algo_name(cc->iec, 0));
}
if (cc->iecdsa != 0) {
fprintf(stderr, " ECDSA: %s\n",
get_algo_name(cc->iecdsa, 0));
}
if (cc->irsavrfy != 0) {
fprintf(stderr, " RSA (vrfy): %s\n",
get_algo_name(cc->irsavrfy, 0));
}
}
#ifdef _WIN32
fd_event = WSA_INVALID_EVENT;
can_send = 0;
can_recv = 0;
bb.ptr = bb.len = 0;
#endif
/*
* On Unix systems, we need to follow three descriptors:
* standard input (0), standard output (1), and the socket
* itself (for both read and write). This is done with a poll()
* call.
*
* On Windows systems, we use WSAEventSelect() to associate
* an event handle with the network activity, and we use
* WaitForMultipleObjectsEx() on that handle and the standard
* input handle, when appropriate. Standard output is assumed
* to be always writeable, and standard input to be the console;
* this does not work well (or at all) with redirections (to
* pipes or files) but it should be enough for a debug tool
* (TODO: make something that handles redirections as well).
*/
#ifdef _WIN32
fd_event = WSACreateEvent();
if (fd_event == WSA_INVALID_EVENT) {
fprintf(stderr, "ERROR: WSACreateEvent() failed with %d\n",
WSAGetLastError());
retcode = -2;
goto engine_exit;
}
WSAEventSelect(fd, fd_event, FD_READ | FD_WRITE | FD_CLOSE);
h_in = GetStdHandle(STD_INPUT_HANDLE);
h_out = GetStdHandle(STD_OUTPUT_HANDLE);
SetConsoleMode(h_in, ENABLE_ECHO_INPUT
| ENABLE_LINE_INPUT
| ENABLE_PROCESSED_INPUT
| ENABLE_PROCESSED_OUTPUT
| ENABLE_WRAP_AT_EOL_OUTPUT);
#else
/*
* Make sure that stdin and stdout are non-blocking.
*/
fcntl(0, F_SETFL, O_NONBLOCK);
fcntl(1, F_SETFL, O_NONBLOCK);
#endif
/*
* Perform the loop.
*/
for (;;) {
unsigned st;
int sendrec, recvrec, sendapp, recvapp;
#ifdef _WIN32
HANDLE pfd[2];
DWORD wt;
#else
struct pollfd pfd[3];
int n;
#endif
size_t u, k_fd, k_in, k_out;
int sendrec_ok, recvrec_ok, sendapp_ok, recvapp_ok;
/*
* Get current engine state.
*/
st = br_ssl_engine_current_state(cc);
if (st == BR_SSL_CLOSED) {
int err;
err = br_ssl_engine_last_error(cc);
if (err == BR_ERR_OK) {
if (verbose) {
fprintf(stderr,
"SSL closed normally\n");
}
retcode = 0;
goto engine_exit;
} else {
fprintf(stderr, "ERROR: SSL error %d", err);
retcode = err;
if (err >= BR_ERR_SEND_FATAL_ALERT) {
err -= BR_ERR_SEND_FATAL_ALERT;
fprintf(stderr,
" (sent alert %d)\n", err);
} else if (err >= BR_ERR_RECV_FATAL_ALERT) {
err -= BR_ERR_RECV_FATAL_ALERT;
fprintf(stderr,
" (received alert %d)\n", err);
} else {
const char *ename;
ename = find_error_name(err, NULL);
if (ename == NULL) {
ename = "unknown";
}
fprintf(stderr, " (%s)\n", ename);
}
goto engine_exit;
}
}
/*
* Compute descriptors that must be polled, depending
* on engine state.
*/
sendrec = ((st & BR_SSL_SENDREC) != 0);
recvrec = ((st & BR_SSL_RECVREC) != 0);
sendapp = ((st & BR_SSL_SENDAPP) != 0);
recvapp = ((st & BR_SSL_RECVAPP) != 0);
if (verbose && sendapp && !hsdetails) {
char csn[80];
const char *pname;
fprintf(stderr, "Handshake completed\n");
fprintf(stderr, " version: ");
switch (cc->session.version) {
case BR_SSL30:
fprintf(stderr, "SSL 3.0");
break;
case BR_TLS10:
fprintf(stderr, "TLS 1.0");
break;
case BR_TLS11:
fprintf(stderr, "TLS 1.1");
break;
case BR_TLS12:
fprintf(stderr, "TLS 1.2");
break;
default:
fprintf(stderr, "unknown (0x%04X)",
(unsigned)cc->session.version);
break;
}
fprintf(stderr, "\n");
get_suite_name_ext(
cc->session.cipher_suite, csn, sizeof csn);
fprintf(stderr, " cipher suite: %s\n", csn);
if (uses_ecdhe(cc->session.cipher_suite)) {
get_curve_name_ext(
br_ssl_engine_get_ecdhe_curve(cc),
csn, sizeof csn);
fprintf(stderr,
" ECDHE curve: %s\n", csn);
}
fprintf(stderr, " secure renegotiation: %s\n",
cc->reneg == 1 ? "no" : "yes");
pname = br_ssl_engine_get_selected_protocol(cc);
if (pname != NULL) {
fprintf(stderr,
" protocol name (ALPN): %s\n",
pname);
}
hsdetails = 1;
}
k_fd = (size_t)-1;
k_in = (size_t)-1;
k_out = (size_t)-1;
u = 0;
#ifdef _WIN32
/*
* If we recorded that we can send or receive data, and we
* want to do exactly that, then we don't wait; we just do
* it.
*/
recvapp_ok = 0;
sendrec_ok = 0;
recvrec_ok = 0;
sendapp_ok = 0;
if (sendrec && can_send) {
sendrec_ok = 1;
} else if (recvrec && can_recv) {
recvrec_ok = 1;
} else if (recvapp) {
recvapp_ok = 1;
} else if (sendapp && in_avail_buffered(h_in, &bb)) {
sendapp_ok = 1;
} else {
/*
* If we cannot do I/O right away, then we must
* wait for some event, and try again.
*/
pfd[u] = (HANDLE)fd_event;
k_fd = u;
u ++;
if (sendapp) {
pfd[u] = h_in;
k_in = u;
u ++;
}
wt = WaitForMultipleObjectsEx(u, pfd,
FALSE, INFINITE, FALSE);
if (wt == WAIT_FAILED) {
fprintf(stderr, "ERROR:"
" WaitForMultipleObjectsEx()"
" failed with 0x%08lX",
(unsigned long)GetLastError());
retcode = -2;
goto engine_exit;
}
if (wt == k_fd) {
WSANETWORKEVENTS e;
if (WSAEnumNetworkEvents(fd, fd_event, &e)) {
fprintf(stderr, "ERROR:"
" WSAEnumNetworkEvents()"
" failed with %d\n",
WSAGetLastError());
retcode = -2;
goto engine_exit;
}
if (e.lNetworkEvents & (FD_WRITE | FD_CLOSE)) {
can_send = 1;
}
if (e.lNetworkEvents & (FD_READ | FD_CLOSE)) {
can_recv = 1;
}
}
continue;
}
#else
if (sendrec || recvrec) {
pfd[u].fd = fd;
pfd[u].revents = 0;
pfd[u].events = 0;
if (sendrec) {
pfd[u].events |= POLLOUT;
}
if (recvrec) {
pfd[u].events |= POLLIN;
}
k_fd = u;
u ++;
}
if (sendapp) {
pfd[u].fd = 0;
pfd[u].revents = 0;
pfd[u].events = POLLIN;
k_in = u;
u ++;
}
if (recvapp) {
pfd[u].fd = 1;
pfd[u].revents = 0;
pfd[u].events = POLLOUT;
k_out = u;
u ++;
}
n = poll(pfd, u, -1);
if (n < 0) {
if (errno == EINTR) {
continue;
}
perror("ERROR: poll()");
retcode = -2;
goto engine_exit;
}
if (n == 0) {
continue;
}
/*
* We transform closures/errors into read+write accesses
* so as to force the read() or write() call that will
* detect the situation.
*/
while (u -- > 0) {
if (pfd[u].revents & (POLLERR | POLLHUP)) {
pfd[u].revents |= POLLIN | POLLOUT;
}
}
recvapp_ok = recvapp && (pfd[k_out].revents & POLLOUT) != 0;
sendrec_ok = sendrec && (pfd[k_fd].revents & POLLOUT) != 0;
recvrec_ok = recvrec && (pfd[k_fd].revents & POLLIN) != 0;
sendapp_ok = sendapp && (pfd[k_in].revents & POLLIN) != 0;
#endif
/*
* We give preference to outgoing data, on stdout and on
* the socket.
*/
if (recvapp_ok) {
unsigned char *buf;
size_t len;
#ifdef _WIN32
DWORD wlen;
#else
ssize_t wlen;
#endif
buf = br_ssl_engine_recvapp_buf(cc, &len);
#ifdef _WIN32
if (!WriteFile(h_out, buf, len, &wlen, NULL)) {
if (verbose) {
fprintf(stderr, "stdout closed...\n");
}
retcode = -2;
goto engine_exit;
}
#else
wlen = write(1, buf, len);
if (wlen <= 0) {
if (verbose) {
fprintf(stderr, "stdout closed...\n");
}
retcode = -2;
goto engine_exit;
}
#endif
br_ssl_engine_recvapp_ack(cc, wlen);
continue;
}
if (sendrec_ok) {
unsigned char *buf;
size_t len;
int wlen;
buf = br_ssl_engine_sendrec_buf(cc, &len);
wlen = send(fd, buf, len, 0);
if (wlen <= 0) {
#ifdef _WIN32
int err;
err = WSAGetLastError();
if (err == EWOULDBLOCK
|| err == WSAEWOULDBLOCK)
{
can_send = 0;
continue;
}
#else
if (errno == EINTR || errno == EWOULDBLOCK) {
continue;
}
#endif
if (verbose) {
fprintf(stderr, "socket closed...\n");
}
retcode = -1;
goto engine_exit;
}
if (trace) {
dump_blob("Outgoing bytes", buf, wlen);
}
br_ssl_engine_sendrec_ack(cc, wlen);
continue;
}
if (recvrec_ok) {
unsigned char *buf;
size_t len;
int rlen;
buf = br_ssl_engine_recvrec_buf(cc, &len);
rlen = recv(fd, buf, len, 0);
if (rlen == 0) {
if (verbose) {
fprintf(stderr, "socket closed...\n");
}
retcode = -1;
goto engine_exit;
}
if (rlen < 0) {
#ifdef _WIN32
int err;
err = WSAGetLastError();
if (err == EWOULDBLOCK
|| err == WSAEWOULDBLOCK)
{
can_recv = 0;
continue;
}
#else
if (errno == EINTR || errno == EWOULDBLOCK) {
continue;
}
#endif
if (verbose) {
fprintf(stderr, "socket broke...\n");
}
retcode = -1;
goto engine_exit;
}
if (trace) {
dump_blob("Incoming bytes", buf, rlen);
}
br_ssl_engine_recvrec_ack(cc, rlen);
continue;
}
if (sendapp_ok) {
unsigned char *buf;
size_t len;
#ifdef _WIN32
int rlen;
#else
ssize_t rlen;
#endif
buf = br_ssl_engine_sendapp_buf(cc, &len);
#ifdef _WIN32
rlen = in_read_buffered(h_in, &bb, buf, len);
#else
rlen = read(0, buf, len);
#endif
if (rlen <= 0) {
if (verbose) {
fprintf(stderr, "stdin closed...\n");
}
br_ssl_engine_close(cc);
} else if (!run_command(cc, buf, rlen)) {
br_ssl_engine_sendapp_ack(cc, rlen);
}
br_ssl_engine_flush(cc, 0);
continue;
}
/* We should never reach that point. */
fprintf(stderr, "ERROR: poll() misbehaves\n");
retcode = -2;
goto engine_exit;
}
/*
* Release allocated structures.
*/
engine_exit:
#ifdef _WIN32
if (fd_event != WSA_INVALID_EVENT) {
WSACloseEvent(fd_event);
}
#endif
return retcode;
}
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