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OVMS3/OVMS.V3/components/wolfssh/src/ssh.c

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Initial commit, fork from original Project
2022-04-05 22:04:46 +00:00
/* ssh.c
*
* Copyright (C) 2014-2020 wolfSSL Inc.
*
* This file is part of wolfSSH.
*
* wolfSSH is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* wolfSSH is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wolfSSH. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* The ssh module contains the public API for wolfSSH.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssh/ssh.h>
#include <wolfssh/internal.h>
#include <wolfssh/log.h>
#include <wolfssl/wolfcrypt/wc_port.h>
#ifdef NO_INLINE
#include <wolfssh/misc.h>
#else
#define WOLFSSH_MISC_INCLUDED
#include "src/misc.c"
#endif
int wolfSSH_Init(void)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_Init()");
if (wolfCrypt_Init() != 0)
ret = WS_CRYPTO_FAILED;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_Init(), returning %d", ret);
return ret;
}
int wolfSSH_Cleanup(void)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_Cleanup()");
if (wolfCrypt_Cleanup() != 0)
ret = WS_CRYPTO_FAILED;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_Cleanup(), returning %d", ret);
return ret;
}
WOLFSSH_CTX* wolfSSH_CTX_new(byte side, void* heap)
{
WOLFSSH_CTX* ctx;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_CTX_new()");
if (side != WOLFSSH_ENDPOINT_SERVER && side != WOLFSSH_ENDPOINT_CLIENT) {
WLOG(WS_LOG_DEBUG, "Invalid endpoint type");
return NULL;
}
ctx = (WOLFSSH_CTX*)WMALLOC(sizeof(WOLFSSH_CTX), heap, DYNTYPE_CTX);
ctx = CtxInit(ctx, side, heap);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_CTX_new(), ctx = %p", ctx);
return ctx;
}
void wolfSSH_CTX_free(WOLFSSH_CTX* ctx)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_CTX_free()");
if (ctx) {
CtxResourceFree(ctx);
WFREE(ctx, ctx->heap, DYNTYPE_CTX);
}
}
WOLFSSH* wolfSSH_new(WOLFSSH_CTX* ctx)
{
WOLFSSH* ssh;
void* heap = NULL;
(void)heap;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_new()");
if (ctx)
heap = ctx->heap;
else {
WLOG(WS_LOG_ERROR, "Trying to init a wolfSSH w/o wolfSSH_CTX");
return NULL;
}
ssh = (WOLFSSH*)WMALLOC(sizeof(WOLFSSH), heap, DYNTYPE_SSH);
ssh = SshInit(ssh, ctx);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_new(), ssh = %p", ssh);
return ssh;
}
void wolfSSH_free(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_free()");
if (ssh) {
void* heap = ssh->ctx ? ssh->ctx->heap : NULL;
#ifdef WOLFSSH_SFTP
if (wolfSSH_SFTP_free(ssh) != WS_SUCCESS) {
WLOG(WS_LOG_SFTP, "Error cleaning up SFTP connection");
}
#endif
#ifdef WOLFSSH_AGENT
if (ssh->agent != NULL)
wolfSSH_AGENT_free(ssh->agent);
#endif /* WOLFSSH_AGENT */
SshResourceFree(ssh, heap);
WFREE(ssh, heap, DYNTYPE_SSH);
}
}
int wolfSSH_set_fd(WOLFSSH* ssh, WS_SOCKET_T fd)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_set_fd()");
if (ssh) {
ssh->rfd = fd;
ssh->wfd = fd;
ssh->ioReadCtx = &ssh->rfd;
ssh->ioWriteCtx = &ssh->wfd;
return WS_SUCCESS;
}
return WS_BAD_ARGUMENT;
}
WS_SOCKET_T wolfSSH_get_fd(const WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_get_fd()");
if (ssh)
return ssh->rfd;
#ifdef USE_WINDOWS_API
return INVALID_SOCKET;
#else
return WS_BAD_ARGUMENT;
#endif
}
int wolfSSH_SetFilesystemHandle(WOLFSSH* ssh, void* handle)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetFilesystemHandle()");
if (ssh) {
ssh->fs = handle;
return WS_SUCCESS;
}
return WS_BAD_ARGUMENT;
}
void* wolfSSH_GetFilesystemHandle(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetFilesystemHandle()");
if (ssh)
return ssh->fs;
return NULL;
}
int wolfSSH_SetHighwater(WOLFSSH* ssh, word32 highwater)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetHighwater()");
if (ssh) {
ssh->highwaterMark = highwater;
return WS_SUCCESS;
}
return WS_BAD_ARGUMENT;
}
word32 wolfSSH_GetHighwater(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetHighwater()");
if (ssh)
return ssh->highwaterMark;
return 0;
}
void wolfSSH_SetHighwaterCb(WOLFSSH_CTX* ctx, word32 highwater,
WS_CallbackHighwater cb)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetHighwaterCb()");
if (ctx) {
ctx->highwaterMark = highwater;
ctx->highwaterCb = cb;
}
}
void wolfSSH_SetHighwaterCtx(WOLFSSH* ssh, void* ctx)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetHighwaterCtx()");
if (ssh)
ssh->highwaterCtx = ctx;
}
void* wolfSSH_GetHighwaterCtx(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetHighwaterCtx()");
if (ssh)
return ssh->highwaterCtx;
return NULL;
}
void wolfSSH_SetGlobalReq(WOLFSSH_CTX *ctx, WS_CallbackGlobalReq cb)
{
if (ctx)
ctx->globalReqCb = cb;
}
void wolfSSH_SetReqSuccess(WOLFSSH_CTX *ctx, WS_CallbackReqSuccess cb)
{
if (ctx)
ctx->reqSuccessCb = cb;
}
void wolfSSH_SetReqFailure(WOLFSSH_CTX *ctx, WS_CallbackReqSuccess cb)
{
if (ctx)
ctx->reqFailureCb = cb;
}
void wolfSSH_SetGlobalReqCtx(WOLFSSH* ssh, void *ctx)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetGlobalReqCtx()");
if (ssh)
ssh->globalReqCtx = ctx;
}
void *wolfSSH_GetGlobalReqCtx(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetGlobalReqCtx()");
if (ssh)
return ssh->globalReqCtx;
return NULL;
}
void wolfSSH_SetReqSuccessCtx(WOLFSSH *ssh, void *ctx)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetReqSuccessCtx()");
if (ssh)
ssh->reqSuccessCtx = ctx;
}
void *wolfSSH_GetReqSuccessCtx(WOLFSSH *ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetReqSuccessCtx()");
if (ssh)
return ssh->reqSuccessCtx;
return NULL;
}
void wolfSSH_SetReqFailureCtx(WOLFSSH *ssh, void *ctx)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SetReqFailureCtx()");
if (ssh)
ssh->reqFailureCtx = ctx;
}
void *wolfSSH_GetReqFailureCtx(WOLFSSH *ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetReqFailureCtx()");
if (ssh)
return ssh->reqFailureCtx;
return NULL;
}
int wolfSSH_get_error(const WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_get_error()");
if (ssh)
return ssh->error;
return WS_SSH_NULL_E;
}
const char* wolfSSH_get_error_name(const WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_get_error_name()");
if (ssh)
return GetErrorString(ssh->error);
return GetErrorString(WS_SSH_NULL_E);
}
const char* wolfSSH_ErrorToName(int err)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ErrorToName()");
return GetErrorString(err);
}
#ifndef NO_WOLFSSH_SERVER
const char acceptError[] = "accept error: %s, %d";
const char acceptState[] = "accept state: %s";
int wolfSSH_accept(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_accept()");
if (ssh == NULL)
return WS_BAD_ARGUMENT;
/* check if data pending to be sent */
if (ssh->outputBuffer.length > 0 &&
ssh->acceptState < ACCEPT_CLIENT_SESSION_ESTABLISHED) {
if ((ssh->error = wolfSSH_SendPacket(ssh)) == WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, "Sent pending packet");
/* adjust state, a couple of them use multiple sends */
if (ssh->acceptState != ACCEPT_SERVER_VERSION_SENT &&
ssh->acceptState != ACCEPT_SERVER_USERAUTH_ACCEPT_SENT &&
ssh->acceptState != ACCEPT_SERVER_KEXINIT_SENT &&
ssh->acceptState != ACCEPT_KEYED &&
ssh->acceptState != ACCEPT_SERVER_CHANNEL_ACCEPT_SENT) {
WLOG(WS_LOG_DEBUG, "Advancing accept state");
ssh->acceptState++;
}
/* handle in process reply state */
if (ssh->processReplyState == PROCESS_PACKET) {
WLOG(WS_LOG_DEBUG, "PR3: peerMacSz = %u", ssh->peerMacSz);
ssh->inputBuffer.idx += ssh->peerMacSz;
WLOG(WS_LOG_DEBUG, "PR4: Shrinking input buffer");
ShrinkBuffer(&ssh->inputBuffer, 1);
ssh->processReplyState = PROCESS_INIT;
WLOG(WS_LOG_DEBUG, "PR5: txCount = %u, rxCount = %u",
ssh->txCount, ssh->rxCount);
}
}
else {
return WS_FATAL_ERROR;
}
}
while (ssh->acceptState != ACCEPT_CLIENT_SESSION_ESTABLISHED) {
switch (ssh->acceptState) {
case ACCEPT_BEGIN:
if ( (ssh->error = SendProtoId(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError, "BEGIN", ssh->error);
return WS_FATAL_ERROR;
}
ssh->acceptState = ACCEPT_SERVER_VERSION_SENT;
WLOG(WS_LOG_DEBUG, acceptState, "SERVER_VERSION_SENT");
FALL_THROUGH;
/* no break */
case ACCEPT_SERVER_VERSION_SENT:
while (ssh->clientState < CLIENT_VERSION_DONE) {
if ( (ssh->error = DoProtoId(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_VERSION_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->acceptState = ACCEPT_CLIENT_VERSION_DONE;
WLOG(WS_LOG_DEBUG, acceptState, "CLIENT_VERSION_DONE");
FALL_THROUGH;
/* no break */
case ACCEPT_CLIENT_VERSION_DONE:
if ( (ssh->error = SendKexInit(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError,
"CLIENT_VERSION_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->acceptState = ACCEPT_SERVER_KEXINIT_SENT;
WLOG(WS_LOG_DEBUG, acceptState, "SERVER_KEXINIT_SENT");
FALL_THROUGH;
/* no break */
case ACCEPT_SERVER_KEXINIT_SENT:
while (ssh->isKeying) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_KEXINIT_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->acceptState = ACCEPT_KEYED;
WLOG(WS_LOG_DEBUG, acceptState, "KEYED");
FALL_THROUGH;
/* no break */
case ACCEPT_KEYED:
while (ssh->clientState < CLIENT_USERAUTH_REQUEST_DONE) {
if (DoReceive(ssh) < 0) {
WLOG(WS_LOG_DEBUG, acceptError,
"KEYED", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->acceptState = ACCEPT_CLIENT_USERAUTH_REQUEST_DONE;
WLOG(WS_LOG_DEBUG, acceptState, "CLIENT_USERAUTH_REQUEST_DONE");
FALL_THROUGH;
/* no break */
case ACCEPT_CLIENT_USERAUTH_REQUEST_DONE:
if ( (ssh->error = SendServiceAccept(ssh,
ID_SERVICE_USERAUTH)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError,
"CLIENT_USERAUTH_REQUEST_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->acceptState = ACCEPT_SERVER_USERAUTH_ACCEPT_SENT;
WLOG(WS_LOG_DEBUG, acceptState,
"ACCEPT_SERVER_USERAUTH_ACCEPT_SENT");
FALL_THROUGH;
/* no break */
case ACCEPT_SERVER_USERAUTH_ACCEPT_SENT:
while (ssh->clientState < CLIENT_USERAUTH_DONE) {
if (DoReceive(ssh) < 0) {
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_USERAUTH_ACCEPT_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->acceptState = ACCEPT_CLIENT_USERAUTH_DONE;
WLOG(WS_LOG_DEBUG, acceptState, "CLIENT_USERAUTH_DONE");
FALL_THROUGH;
/* no break */
case ACCEPT_CLIENT_USERAUTH_DONE:
if ( (ssh->error = SendUserAuthSuccess(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, acceptError,
"CLIENT_USERAUTH_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->acceptState = ACCEPT_SERVER_USERAUTH_SENT;
WLOG(WS_LOG_DEBUG, acceptState, "SERVER_USERAUTH_SENT");
FALL_THROUGH;
/* no break */
case ACCEPT_SERVER_USERAUTH_SENT:
while (ssh->clientState < CLIENT_CHANNEL_OPEN_DONE) {
if (DoReceive(ssh) < 0) {
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_USERAUTH_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->acceptState = ACCEPT_SERVER_CHANNEL_ACCEPT_SENT;
WLOG(WS_LOG_DEBUG, acceptState, "SERVER_CHANNEL_ACCEPT_SENT");
FALL_THROUGH;
/* no break */
case ACCEPT_SERVER_CHANNEL_ACCEPT_SENT:
while (ssh->clientState < CLIENT_DONE) {
if (DoReceive(ssh) < 0) {
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_CHANNEL_ACCEPT_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
#ifdef WOLFSSH_SCP
if (ChannelCommandIsScp(ssh)) {
ssh->acceptState = ACCEPT_INIT_SCP_TRANSFER;
WLOG(WS_LOG_DEBUG, acceptState, "ACCEPT_INIT_SCP_TRANSFER");
continue;
}
#endif
#if defined(WOLFSSH_SFTP) && !defined(NO_WOLFSSH_SERVER)
{
const char* cmd = wolfSSH_GetSessionCommand(ssh);
if (cmd != NULL &&
WOLFSSH_SESSION_SUBSYSTEM == wolfSSH_GetSessionType(ssh)
&& (WSTRNCMP(cmd, "sftp", 4) == 0)) {
ssh->acceptState = ACCEPT_INIT_SFTP;
return wolfSSH_SFTP_accept(ssh);
}
}
#endif /* WOLFSSH_SFTP and !NO_WOLFSSH_SERVER */
#ifdef WOLFSSH_AGENT
if (ssh->useAgent) {
WOLFSSH_AGENT_CTX* newAgent;
WOLFSSH_CHANNEL* newChannel;
WLOG(WS_LOG_AGENT, "Starting agent channel");
newAgent = wolfSSH_AGENT_new(ssh->ctx->heap);
if (newAgent == NULL) {
ssh->error = WS_MEMORY_E;
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_USERAUTH_ACCEPT_DONE", ssh->error);
return WS_ERROR;
}
newChannel = ChannelNew(ssh, ID_CHANTYPE_AUTH_AGENT,
ssh->ctx->windowSz, ssh->ctx->maxPacketSz);
if (newChannel == NULL) {
wolfSSH_AGENT_free(newAgent);
ssh->error = WS_MEMORY_E;
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_USERAUTH_ACCEPT_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->error = SendChannelOpenSession(ssh, newChannel);
if (ssh->error < WS_SUCCESS) {
if (ssh->error == WS_WANT_WRITE ||
ssh->error == WS_WANT_READ) {
ChannelAppend(ssh, newChannel);
}
else {
ChannelDelete(newChannel, ssh->ctx->heap);
wolfSSH_AGENT_free(newAgent);
}
WLOG(WS_LOG_DEBUG, acceptError,
"SERVER_USERAUTH_ACCEPT_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ChannelAppend(ssh, newChannel);
newAgent->channel = newChannel->channel;
if (ssh->ctx->agentCb) {
ssh->ctx->agentCb(WOLFSSH_AGENT_LOCAL_SETUP,
ssh->agentCbCtx);
}
if (ssh->agent != NULL)
wolfSSH_AGENT_free(ssh->agent);
ssh->agent = newAgent;
}
#endif /* WOLFSSH_AGENT */
ssh->acceptState = ACCEPT_CLIENT_SESSION_ESTABLISHED;
WLOG(WS_LOG_DEBUG, acceptState, "CLIENT_SESSION_ESTABLISHED");
break;
#ifdef WOLFSSH_SCP
case ACCEPT_INIT_SCP_TRANSFER:
if ( (ssh->error = DoScpRequest(ssh)) < 0) {
WLOG(WS_LOG_DEBUG, acceptError, "INIT_SCP_TRANSFER",
ssh->error);
return WS_FATAL_ERROR;
}
return WS_SCP_COMPLETE;
#endif
#ifdef WOLFSSH_SFTP
case ACCEPT_INIT_SFTP:
return wolfSSH_SFTP_accept(ssh);
#endif
}
} /* end while */
return WS_SUCCESS;
}
#endif /* NO_WOLFSSH_SERVER */
#ifndef NO_WOLFSSH_CLIENT
const char connectError[] = "connect error: %s, %d";
const char connectState[] = "connect state: %s";
int wolfSSH_connect(WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_connect()");
if (ssh == NULL)
return WS_BAD_ARGUMENT;
/* check if data pending to be sent */
if (ssh->outputBuffer.length > 0 &&
ssh->connectState < CONNECT_SERVER_CHANNEL_REQUEST_DONE) {
if ((ssh->error = wolfSSH_SendPacket(ssh)) == WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, "Sent pending packet");
/* adjust state, a couple of them use multiple sends */
if (ssh->connectState != CONNECT_CLIENT_VERSION_SENT &&
ssh->connectState != CONNECT_CLIENT_KEXINIT_SENT &&
ssh->connectState != CONNECT_CLIENT_KEXDH_INIT_SENT &&
ssh->connectState != CONNECT_CLIENT_USERAUTH_REQUEST_SENT &&
ssh->connectState != CONNECT_CLIENT_USERAUTH_SENT &&
ssh->connectState != CONNECT_CLIENT_CHANNEL_OPEN_SESSION_SENT &&
ssh->connectState != CONNECT_CLIENT_CHANNEL_REQUEST_SENT) {
WLOG(WS_LOG_DEBUG, "Advancing connect state");
ssh->connectState++;
}
/* handle in process reply state */
if (ssh->processReplyState == PROCESS_PACKET) {
WLOG(WS_LOG_DEBUG, "PR3: peerMacSz = %u", ssh->peerMacSz);
ssh->inputBuffer.idx += ssh->peerMacSz;
WLOG(WS_LOG_DEBUG, "PR4: Shrinking input buffer");
ShrinkBuffer(&ssh->inputBuffer, 1);
ssh->processReplyState = PROCESS_INIT;
WLOG(WS_LOG_DEBUG, "PR5: txCount = %u, rxCount = %u",
ssh->txCount, ssh->rxCount);
}
}
else {
return WS_FATAL_ERROR;
}
}
switch (ssh->connectState) {
case CONNECT_BEGIN:
if ( (ssh->error = SendProtoId(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError, "BEGIN", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_VERSION_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_VERSION_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_VERSION_SENT:
while (ssh->serverState < SERVER_VERSION_DONE) {
if ( (ssh->error = DoProtoId(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_VERSION_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_VERSION_DONE;
WLOG(WS_LOG_DEBUG, connectState, "SERVER_VERSION_DONE");
FALL_THROUGH;
/* no break */
case CONNECT_SERVER_VERSION_DONE:
if ( (ssh->error = SendKexInit(ssh)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_VERSION_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_KEXINIT_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_KEXINIT_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_KEXINIT_SENT:
while (ssh->serverState < SERVER_KEXINIT_DONE) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_KEXINIT_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_KEXINIT_DONE;
WLOG(WS_LOG_DEBUG, connectState, "SERVER_KEXINIT_DONE");
FALL_THROUGH;
/* no break */
case CONNECT_SERVER_KEXINIT_DONE:
if (ssh->handshake == NULL) {
return WS_FATAL_ERROR;
}
if (ssh->handshake->kexId == ID_DH_GEX_SHA256) {
#ifndef WOLFSSH_NO_DH
ssh->error = SendKexDhGexRequest(ssh);
#endif
}
else
ssh->error = SendKexDhInit(ssh);
if (ssh->error < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_KEXINIT_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_KEXDH_INIT_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_KEXDH_INIT_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_KEXDH_INIT_SENT:
while (ssh->isKeying) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_KEXDH_INIT_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_KEYED;
WLOG(WS_LOG_DEBUG, connectState, "KEYED");
FALL_THROUGH;
/* no break */
case CONNECT_KEYED:
if ( (ssh->error = SendServiceRequest(ssh, ID_SERVICE_USERAUTH)) <
WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError, "KEYED", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_USERAUTH_REQUEST_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_USERAUTH_REQUEST_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_USERAUTH_REQUEST_SENT:
while (ssh->serverState < SERVER_USERAUTH_REQUEST_DONE) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_USERAUTH_REQUEST_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_USERAUTH_REQUEST_DONE;
WLOG(WS_LOG_DEBUG, connectState, "SERVER_USERAUTH_REQUEST_DONE");
FALL_THROUGH;
/* no break */
case CONNECT_SERVER_USERAUTH_REQUEST_DONE:
#ifdef WOLFSSH_AGENT
if (ssh->agentEnabled) {
ssh->agent = wolfSSH_AGENT_new(ssh->ctx->heap);
if (ssh->agent == NULL) {
ssh->agentEnabled = 0;
WLOG(WS_LOG_INFO, "Unable to create agent. Disabling.");
}
}
#endif
if ( (ssh->error = SendUserAuthRequest(ssh, ID_NONE, 0)) <
WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_USERAUTH_REQUEST_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_USERAUTH_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_USERAUTH_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_USERAUTH_SENT:
while (ssh->serverState < SERVER_USERAUTH_ACCEPT_DONE) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_USERAUTH_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_USERAUTH_ACCEPT_DONE;
WLOG(WS_LOG_DEBUG, connectState, "SERVER_USERAUTH_ACCEPT_DONE");
FALL_THROUGH;
/* no break */
case CONNECT_SERVER_USERAUTH_ACCEPT_DONE:
{
WOLFSSH_CHANNEL* newChannel;
newChannel = ChannelNew(ssh, ID_CHANTYPE_SESSION,
ssh->ctx->windowSz, ssh->ctx->maxPacketSz);
if (newChannel == NULL) {
ssh->error = WS_MEMORY_E;
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_USERAUTH_ACCEPT_DONE", ssh->error);
return WS_FATAL_ERROR;
}
if ( (ssh->error =
SendChannelOpenSession(ssh, newChannel)) < WS_SUCCESS) {
if (ssh->error == WS_WANT_WRITE ||
ssh->error == WS_WANT_READ) {
ChannelAppend(ssh, newChannel);
}
else {
ChannelDelete(newChannel, ssh->ctx->heap);
}
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_USERAUTH_ACCEPT_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ChannelAppend(ssh, newChannel);
}
ssh->connectState = CONNECT_CLIENT_CHANNEL_OPEN_SESSION_SENT;
WLOG(WS_LOG_DEBUG, connectState,
"CLIENT_CHANNEL_OPEN_SESSION_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_CHANNEL_OPEN_SESSION_SENT:
while (ssh->serverState < SERVER_CHANNEL_OPEN_DONE) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_CHANNEL_OPEN_SESSION_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_CHANNEL_OPEN_SESSION_DONE;
WLOG(WS_LOG_DEBUG, connectState,
"SERVER_CHANNEL_OPEN_SESSION_DONE");
FALL_THROUGH;
/* no break */
case CONNECT_SERVER_CHANNEL_OPEN_SESSION_DONE:
#ifdef WOLFSSH_AGENT
if (ssh->agentEnabled) {
if ( (ssh->error = SendChannelAgentRequest(ssh))
< WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_CHANNEL_OPEN_SESSION_DONE", ssh->error);
return WS_FATAL_ERROR;
}
}
#endif
WLOG(WS_LOG_DEBUG, connectState,
"CLIENT_CHANNEL_AGENT_REQUEST_SENT");
ssh->connectState = CONNECT_CLIENT_CHANNEL_AGENT_REQUEST_SENT;
FALL_THROUGH;
case CONNECT_CLIENT_CHANNEL_AGENT_REQUEST_SENT:
#if defined(WOLFSSH_TERM) && !defined(NO_FILESYSTEM)
if (ssh->sendTerminalRequest) {
if ( (ssh->error = SendChannelTerminalRequest(ssh))
< WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_CHANNEL_AGENT_REQUEST_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
#endif
WLOG(WS_LOG_DEBUG, connectState,
"CLIENT_CHANNEL_TERMINAL_REQUEST_SENT");
ssh->connectState = CONNECT_CLIENT_CHANNEL_TERMINAL_REQUEST_SENT;
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_CHANNEL_TERMINAL_REQUEST_SENT:
if ( (ssh->error = SendChannelRequest(ssh, ssh->channelName,
ssh->channelNameSz)) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"SERVER_CHANNEL_OPEN_SESSION_DONE", ssh->error);
return WS_FATAL_ERROR;
}
ssh->connectState = CONNECT_CLIENT_CHANNEL_REQUEST_SENT;
WLOG(WS_LOG_DEBUG, connectState, "CLIENT_CHANNEL_REQUEST_SENT");
FALL_THROUGH;
/* no break */
case CONNECT_CLIENT_CHANNEL_REQUEST_SENT:
while (ssh->serverState < SERVER_DONE) {
if (DoReceive(ssh) < WS_SUCCESS) {
WLOG(WS_LOG_DEBUG, connectError,
"CLIENT_CHANNEL_REQUEST_SENT", ssh->error);
return WS_FATAL_ERROR;
}
}
ssh->connectState = CONNECT_SERVER_CHANNEL_REQUEST_DONE;
WLOG(WS_LOG_DEBUG, connectState,
"SERVER_CHANNEL_REQUEST_DONE");
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_connect()");
return WS_SUCCESS;
}
#endif /* NO_WOLFSSH_CLIENT */
int wolfSSH_shutdown(WOLFSSH* ssh)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_shutdown()");
if (ssh == NULL || ssh->channelList == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS)
ret = SendChannelEof(ssh, ssh->channelList->peerChannel);
if (ret == WS_SUCCESS)
ret = SendChannelExit(ssh, ssh->channelList->peerChannel, 0);
if (ret == WS_SUCCESS)
ret = SendChannelClose(ssh, ssh->channelList->peerChannel);
if (ssh != NULL && ssh->channelList == NULL) {
WLOG(WS_LOG_DEBUG, "channel list was already removed");
ret = WS_SUCCESS;
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_shutdown(), ret = %d", ret);
return ret;
}
int wolfSSH_TriggerKeyExchange(WOLFSSH* ssh)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_TriggerKeyExchange()");
if (ssh == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS)
ret = ssh->error = SendKexInit(ssh);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_TriggerKeyExchange(), ret = %d", ret);
return ret;
}
/* gets current input buffer if any without advancing the internal index.
* returns number of bytes was able to peek at on success */
int wolfSSH_stream_peek(WOLFSSH* ssh, byte* buf, word32 bufSz)
{
Buffer* inputBuffer;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_stream_peek()");
if (ssh == NULL || ssh->channelList == NULL)
return WS_BAD_ARGUMENT;
inputBuffer = &ssh->channelList->inputBuffer;
bufSz = min(bufSz, inputBuffer->length - inputBuffer->idx);
if (buf != NULL) {
WMEMCPY(buf, inputBuffer->buffer + inputBuffer->idx, bufSz);
}
return bufSz;
}
int wolfSSH_stream_read(WOLFSSH* ssh, byte* buf, word32 bufSz)
{
Buffer* inputBuffer;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_stream_read()");
if (ssh == NULL || buf == NULL || bufSz == 0 || ssh->channelList == NULL)
return WS_BAD_ARGUMENT;
inputBuffer = &ssh->channelList->inputBuffer;
while (inputBuffer->length - inputBuffer->idx == 0) {
int ret = DoReceive(ssh);
if (ssh->channelList == NULL || ssh->channelList->receivedEof)
ret = WS_EOF;
if (ret < 0 && ret != WS_CHAN_RXD) {
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_stream_read(), ret = %d", ret);
return ret;
}
if (ssh->error == WS_CHAN_RXD &&
ssh->lastRxId != ssh->channelList->channel) {
return WS_ERROR;
}
}
bufSz = min(bufSz, inputBuffer->length - inputBuffer->idx);
WMEMCPY(buf, inputBuffer->buffer + inputBuffer->idx, bufSz);
inputBuffer->idx += bufSz;
if (!ssh->isKeying && (inputBuffer->length > inputBuffer->bufferSz / 2)) {
word32 usedSz = inputBuffer->length - inputBuffer->idx;
word32 bytesToAdd = inputBuffer->idx;
int sendResult;
WLOG(WS_LOG_DEBUG, "Making more room: %u", usedSz);
if (usedSz) {
WLOG(WS_LOG_DEBUG, " ...moving data down");
WMEMMOVE(inputBuffer->buffer,
inputBuffer->buffer + bytesToAdd, usedSz);
}
sendResult = SendChannelWindowAdjust(ssh, ssh->channelList->channel,
bytesToAdd);
if (sendResult != WS_SUCCESS)
bufSz = sendResult;
WLOG(WS_LOG_INFO, " bytesToAdd = %u", bytesToAdd);
WLOG(WS_LOG_INFO, " windowSz = %u", ssh->channelList->windowSz);
ssh->channelList->windowSz += bytesToAdd;
WLOG(WS_LOG_INFO, " update windowSz = %u", ssh->channelList->windowSz);
inputBuffer->length = usedSz;
inputBuffer->idx = 0;
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_stream_read(), rxd = %d", bufSz);
return bufSz;
}
int wolfSSH_ChannelIdRead(WOLFSSH* ssh, word32 channelId,
byte* buf, word32 bufSz)
{
WOLFSSH_CHANNEL* chan = NULL;
Buffer* inputBuffer;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelIdRead()");
if (ssh == NULL || buf == NULL)
return WS_BAD_ARGUMENT;
chan = ChannelFind(ssh, channelId, WS_CHANNEL_ID_SELF);
if (chan == NULL)
return WS_INVALID_CHANID;
inputBuffer = &chan->inputBuffer;
bufSz = min(bufSz, inputBuffer->length - inputBuffer->idx);
WMEMCPY(buf, inputBuffer->buffer + inputBuffer->idx, bufSz);
inputBuffer->idx += bufSz;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelIdRead(), rxd = %d", bufSz);
return bufSz;
}
int wolfSSH_stream_send(WOLFSSH* ssh, byte* buf, word32 bufSz)
{
int bytesTxd = 0;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_stream_send()");
if (ssh == NULL || buf == NULL || ssh->channelList == NULL)
return WS_BAD_ARGUMENT;
/* case of WANT WRITE and data stored in output buffer */
if (ssh->outputBuffer.plainSz && ssh->outputBuffer.length != 0) {
int ret;
bytesTxd = ssh->outputBuffer.plainSz;
WLOG(WS_LOG_DEBUG, "Trying to resend %d bytes", bytesTxd);
ssh->error = WS_SUCCESS;
ret = wolfSSH_SendPacket(ssh);
/* return the amount sent on success otherwise return error found */
return (ret == WS_SUCCESS)? bytesTxd : ret;
}
bytesTxd = SendChannelData(ssh, ssh->channelList->channel, buf, bufSz);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_stream_send(), txd = %d", bytesTxd);
return bytesTxd;
}
int wolfSSH_ChannelIdSend(WOLFSSH* ssh, word32 channelId,
byte* buf, word32 bufSz)
{
int bytesTxd = 0;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelIdSend()");
if (ssh == NULL || buf == NULL)
return WS_BAD_ARGUMENT;
/* case of WANT WRITE and data stored in output buffer */
if (ssh->outputBuffer.plainSz && ssh->outputBuffer.length != 0) {
int ret;
bytesTxd = ssh->outputBuffer.plainSz;
WLOG(WS_LOG_DEBUG, "Trying to resend %d bytes", bytesTxd);
ssh->error = WS_SUCCESS;
ret = wolfSSH_SendPacket(ssh);
/* return the amount sent on success otherwise return error found */
return (ret == WS_SUCCESS)? bytesTxd : ret;
}
bytesTxd = SendChannelData(ssh, channelId, buf, bufSz);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelIdSend(), txd = %d", bytesTxd);
return bytesTxd;
}
int wolfSSH_stream_exit(WOLFSSH* ssh, int status)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_stream_exit(), status = %d", status);
if (ssh == NULL || ssh->channelList == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS)
ret = SendChannelExit(ssh, ssh->channelList->peerChannel, status);
if (ret == WS_SUCCESS)
ret = SendChannelEow(ssh, ssh->channelList->peerChannel);
if (ret == WS_SUCCESS)
ret = SendChannelEof(ssh, ssh->channelList->peerChannel);
if (ret == WS_SUCCESS)
ret = SendChannelClose(ssh, ssh->channelList->peerChannel);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_stream_exit()");
return ret;
}
int wolfSSH_global_request(WOLFSSH *ssh, const unsigned char* data, word32 dataSz, int reply)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_global_request");
if (ssh == NULL || data == NULL)
return WS_BAD_ARGUMENT;
if (reply != 0 && reply != 1)
return WS_BAD_ARGUMENT;
return SendGlobalRequest(ssh, data, dataSz, reply);
}
/* Reads pending data from extended data buffer. Currently can be used to get
* STDERR information sent across the channel.
* Returns the number of bytes read on success */
int wolfSSH_extended_data_read(WOLFSSH* ssh, byte* out, word32 outSz)
{
byte* buf;
word32 bufSz;
if (ssh == NULL || out == NULL) {
return WS_BAD_ARGUMENT;
}
/* sanity check to make sure idx is not in a bad state */
if (ssh->extDataBuffer.idx > ssh->extDataBuffer.length) {
WLOG(WS_LOG_ERROR, "Bad internal state for buffer index");
return WS_INVALID_STATE_E;
}
bufSz = min(outSz, ssh->extDataBuffer.length - ssh->extDataBuffer.idx);
buf = ssh->extDataBuffer.buffer + ssh->extDataBuffer.idx;
WMEMCPY(out, buf, bufSz);
ssh->extDataBuffer.idx += bufSz;
return bufSz;
}
int wolfSSH_SendIgnore(WOLFSSH* ssh, const byte* buf, word32 bufSz)
{
byte scratch[128];
(void)buf;
(void)bufSz;
WMEMSET(scratch, 0, sizeof(scratch));
return SendIgnore(ssh, scratch, sizeof(scratch));
}
int wolfSSH_SendDisconnect(WOLFSSH *ssh, word32 reason)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_SendDisconnect");
return SendDisconnect(ssh, reason);
}
void wolfSSH_SetUserAuth(WOLFSSH_CTX* ctx, WS_CallbackUserAuth cb)
{
if (ctx != NULL) {
ctx->userAuthCb = cb;
}
}
void wolfSSH_SetUserAuthCtx(WOLFSSH* ssh, void* userAuthCtx)
{
if (ssh != NULL) {
ssh->userAuthCtx = userAuthCtx;
}
}
void* wolfSSH_GetUserAuthCtx(WOLFSSH* ssh)
{
if (ssh != NULL) {
return ssh->userAuthCtx;
}
return NULL;
}
void wolfSSH_CTX_SetPublicKeyCheck(WOLFSSH_CTX* ctx,
WS_CallbackPublicKeyCheck cb)
{
if (ctx != NULL) {
ctx->publicKeyCheckCb = cb;
}
}
void wolfSSH_SetPublicKeyCheckCtx(WOLFSSH* ssh, void* publicKeyCheckCtx)
{
if (ssh != NULL) {
ssh->publicKeyCheckCtx = publicKeyCheckCtx;
}
}
void* wolfSSH_GetPublicKeyCheckCtx(WOLFSSH* ssh)
{
if (ssh != NULL) {
return ssh->publicKeyCheckCtx;
}
return NULL;
}
/* Used to set the channel request type sent in wolfSSH connect. The default
* type set is shell if this function is not called.
*
* type channel type i.e. WOLFSSH_SESSION_SUBSYSTEM
* name name or command in the case of subsystem and exec channel types
* nameSz size of name buffer
*
* returns WS_SUCCESS on success
*/
int wolfSSH_SetChannelType(WOLFSSH* ssh, byte type, byte* name, word32 nameSz)
{
if (ssh == NULL) {
return WS_BAD_ARGUMENT;
}
switch (type) {
case WOLFSSH_SESSION_SHELL:
ssh->connectChannelId = type;
break;
case WOLFSSH_SESSION_EXEC:
if (ssh->ctx->side == WOLFSSH_ENDPOINT_SERVER) {
WLOG(WS_LOG_DEBUG, "Server side exec unsupported");
return WS_BAD_ARGUMENT;
}
FALL_THROUGH;
/* no break */
case WOLFSSH_SESSION_SUBSYSTEM:
ssh->connectChannelId = type;
if (name != NULL && nameSz < WOLFSSH_MAX_CHN_NAMESZ) {
WMEMCPY(ssh->channelName, name, nameSz);
ssh->channelNameSz = nameSz;
}
else {
WLOG(WS_LOG_DEBUG, "No subsystem name or name was too large");
}
break;
#ifdef WOLFSSH_TERM
case WOLFSSH_SESSION_TERMINAL:
/* send a pseudo-terminal request and shell channel */
ssh->sendTerminalRequest = 1;
ssh->connectChannelId = WOLFSSH_SESSION_SHELL;
break;
#endif
default:
WLOG(WS_LOG_DEBUG, "Unknown channel type");
return WS_BAD_ARGUMENT;
}
return WS_SUCCESS;
}
int wolfSSH_SetUsernameRaw(WOLFSSH* ssh,
const byte* username, word32 usernameSz)
{
char* newUsername = NULL;
int ret = WS_SUCCESS;
if (ssh == NULL)
ret = WS_BAD_ARGUMENT;
if (username == NULL || usernameSz == 0)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS) {
newUsername = (char*)WMALLOC(usernameSz + 1,
ssh->ctx->heap, DYNTYPE_STRING);
if (newUsername == NULL)
ret = WS_MEMORY_E;
else {
WMEMCPY(newUsername, username, usernameSz);
newUsername[usernameSz] = 0;
if (ssh->userName != NULL)
WFREE(ssh->userName, ssh->ctx->heap, DYNTYPE_STRING);
ssh->userName = newUsername;
ssh->userNameSz = usernameSz;
}
}
return ret;
}
int wolfSSH_SetUsername(WOLFSSH* ssh, const char* username)
{
int ret = WS_SUCCESS;
if (ssh == NULL || username == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS) {
ret = wolfSSH_SetUsernameRaw(ssh,
(const byte*)username, (word32)WSTRLEN(username));
}
return ret;
}
char* wolfSSH_GetUsername(WOLFSSH* ssh)
{
char* name = NULL;
if (ssh != NULL)
name = ssh->userName;
return name;
}
#include <wolfssl/wolfcrypt/rsa.h>
#include <wolfssl/wolfcrypt/asn_public.h>
#include <wolfssl/wolfcrypt/coding.h>
/* Reads a key from the buffer in to out. If the out buffer doesn't exist
it is created. The type of key is stored in outType. It'll be a pointer
to a constant string. Format indicates the format of the key, currently
either SSH format (a public key) or ASN.1 in DER format (a private key). */
int wolfSSH_ReadKey_buffer(const byte* in, word32 inSz, int format,
byte** out, word32* outSz, const byte** outType, word32* outTypeSz,
void* heap)
{
int ret = WS_SUCCESS;
(void)heap;
if (in == NULL || inSz == 0 || out == NULL || outSz == NULL ||
outType == NULL || outTypeSz == NULL)
return WS_BAD_ARGUMENT;
if (format == WOLFSSH_FORMAT_SSH) {
char* c;
char* last;
char* type;
char* key;
/*
SSH format is:
type AAAABASE64ENCODEDKEYDATA comment
*/
c = WSTRDUP((const char*)in, heap, DYNTYPE_STRING);
type = WSTRTOK(c, " \n", &last);
key = WSTRTOK(NULL, " \n", &last);
if (type != NULL && key != NULL) {
const char* name;
word32 typeSz;
byte nameId;
typeSz = (word32)WSTRLEN(type);
nameId = NameToId(type, typeSz);
name = IdToName(nameId);
*outType = (const byte*)name;
*outTypeSz = typeSz;
ret = Base64_Decode((byte*)key, (word32)WSTRLEN(key), *out, outSz);
}
if (ret != 0)
ret = WS_ERROR;
WFREE(c, heap, DYNTYPE_STRING);
}
else if (format == WOLFSSH_FORMAT_ASN1) {
byte* newKey;
union {
#ifndef WOLFSSH_NO_RSA
RsaKey rsa;
#endif
#ifndef WOLFSSH_NO_ECDSA
ecc_key ecc;
#endif
} testKey;
word32 scratch = 0;
if (*out == NULL) {
newKey = (byte*)WMALLOC(inSz, heap, DYNTYPE_PRIVKEY);
if (newKey == NULL)
return WS_MEMORY_E;
*out = newKey;
}
else {
if (*outSz < inSz)
return WS_ERROR;
newKey = *out;
}
*outSz = inSz;
WMEMCPY(newKey, in, inSz);
#ifndef WOLFSSH_NO_RSA
/* TODO: This is copied and modified from a function in src/internal.c.
This and that code should be combined into a single function. */
if (wc_InitRsaKey(&testKey.rsa, heap) < 0)
return WS_RSA_E;
ret = wc_RsaPrivateKeyDecode(in, &scratch, &testKey.rsa, inSz);
wc_FreeRsaKey(&testKey.rsa);
if (ret == 0) {
*outType = (const byte*)IdToName(ID_SSH_RSA);
*outTypeSz = (word32)WSTRLEN((const char*)*outType);
}
else {
#endif
#ifndef WOLFSSH_NO_ECDSA
byte curveId = ID_UNKNOWN;
/* Couldn't decode as RSA testKey. Try decoding as ECC testKey. */
scratch = 0;
if (wc_ecc_init_ex(&testKey.ecc, heap, INVALID_DEVID) != 0)
return WS_ECC_E;
ret = wc_EccPrivateKeyDecode(in, &scratch,
&testKey.ecc, inSz);
switch (wc_ecc_get_curve_id(testKey.ecc.idx)) {
case ECC_SECP256R1:
curveId = ID_ECDSA_SHA2_NISTP256;
break;
case ECC_SECP384R1:
curveId = ID_ECDSA_SHA2_NISTP384;
break;
case ECC_SECP521R1:
curveId = ID_ECDSA_SHA2_NISTP521;
break;
}
wc_ecc_free(&testKey.ecc);
if (ret == 0) {
*outType = (const byte*)IdToName(curveId);
*outTypeSz = (word32)WSTRLEN((const char*)*outType);
}
else
return WS_BAD_FILE_E;
#endif
#ifndef WOLFSSH_NO_RSA
}
#endif
}
else
ret = WS_ERROR;
return ret;
}
#ifndef NO_FILESYSTEM
/* Reads a key from the file name into a buffer. If the key starts with the
string "ssh-rsa" or "ecdsa-sha2-nistp256", it is considered an SSH format
public key, otherwise it is considered an ASN.1 private key. The buffer
is passed to wolfSSH_ReadKey_buffer() for processing. */
int wolfSSH_ReadKey_file(const char* name,
byte** out, word32* outSz, const byte** outType, word32* outTypeSz,
byte* isPrivate, void* heap)
{
WFILE* file;
byte* in;
word32 inSz;
int format;
int ret;
if (name == NULL)
return WS_BAD_FILE_E;
if (out == NULL || outSz == NULL || outType == NULL || outTypeSz == NULL ||
isPrivate == NULL)
return WS_BAD_ARGUMENT;
ret = WFOPEN(&file, name, "rb");
if (ret != 0 || file == WBADFILE) return WS_BAD_FILE_E;
if (WFSEEK(file, 0, WSEEK_END) != 0) {
WFCLOSE(file);
return WS_BAD_FILE_E;
}
inSz = (word32)WFTELL(file);
WREWIND(file);
if (inSz > WOLFSSH_MAX_FILE_SIZE || inSz == 0) {
WFCLOSE(file);
return WS_BAD_FILE_E;
}
in = (byte*)WMALLOC(inSz + 1, heap, DYNTYPE_FILE);
if (in == NULL) {
WFCLOSE(file);
return WS_MEMORY_E;
}
ret = (int)XFREAD(in, 1, inSz, file);
if (ret <= 0 || (word32)ret != inSz) {
ret = WS_BAD_FILE_E;
}
else {
if (WSTRNSTR((const char*)in,
"ssh-rsa", inSz) == (const char*)in ||
WSTRNSTR((const char*)in,
"ecdsa-sha2-nistp", inSz) == (const char*)in) {
*isPrivate = 0;
format = WOLFSSH_FORMAT_SSH;
in[inSz] = 0;
}
else {
*isPrivate = 1;
format = WOLFSSH_FORMAT_ASN1;
}
ret = wolfSSH_ReadKey_buffer(in, inSz, format,
out, outSz, outType, outTypeSz, heap);
}
WFCLOSE(file);
WFREE(in, heap, DYNTYPE_FILE);
return ret;
}
#endif
int wolfSSH_CTX_SetBanner(WOLFSSH_CTX* ctx,
const char* newBanner)
{
word32 newBannerSz = 0;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_CTX_SetBanner()");
if (ctx == NULL)
return WS_BAD_ARGUMENT;
if (newBanner != NULL) {
WLOG(WS_LOG_INFO, " setting banner to: \"%s\"", newBanner);
newBannerSz = (word32)WSTRLEN(newBanner);
}
ctx->banner = newBanner;
ctx->bannerSz = newBannerSz;
return WS_SUCCESS;
}
int wolfSSH_CTX_UsePrivateKey_buffer(WOLFSSH_CTX* ctx,
const byte* in, word32 inSz, int format)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_CTX_UsePrivateKey_buffer()");
return wolfSSH_ProcessBuffer(ctx, in, inSz, format, BUFTYPE_PRIVKEY);
}
int wolfSSH_CTX_SetWindowPacketSize(WOLFSSH_CTX* ctx,
word32 windowSz, word32 maxPacketSz)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_CTX_SetWindowPacketSize()");
if (ctx == NULL)
return WS_BAD_ARGUMENT;
if (windowSz == 0)
windowSz = DEFAULT_WINDOW_SZ;
if (maxPacketSz == 0)
maxPacketSz = DEFAULT_MAX_PACKET_SZ;
ctx->windowSz = windowSz;
ctx->maxPacketSz = maxPacketSz;
return WS_SUCCESS;
}
void wolfSSH_GetStats(WOLFSSH* ssh, word32* txCount, word32* rxCount,
word32* seq, word32* peerSeq)
{
word32 rTxCount = 0;
word32 rRxCount = 0;
word32 rSeq = 0;
word32 rPeerSeq = 0;
if (ssh != NULL) {
rTxCount = ssh->txCount;
rRxCount = ssh->rxCount;
rSeq = ssh->seq;
rPeerSeq = ssh->peerSeq;
}
if (txCount != NULL)
*txCount = rTxCount;
if (rxCount != NULL)
*rxCount = rRxCount;
if (seq != NULL)
*seq = rSeq;
if (peerSeq != NULL)
*peerSeq = rPeerSeq;
}
int wolfSSH_KDF(byte hashId, byte keyId,
byte* key, word32 keySz,
const byte* k, word32 kSz,
const byte* h, word32 hSz,
const byte* sessionId, word32 sessionIdSz)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_KDF()");
return GenerateKey(hashId, keyId, key, keySz, k, kSz, h, hSz,
sessionId, sessionIdSz);
}
WS_SessionType wolfSSH_GetSessionType(const WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetSessionType()");
if (ssh && ssh->channelList)
return (WS_SessionType)ssh->channelList->sessionType;
return WOLFSSH_SESSION_UNKNOWN;
}
const char* wolfSSH_GetSessionCommand(const WOLFSSH* ssh)
{
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_GetSessionCommand()");
if (ssh && ssh->channelList)
return ssh->channelList->command;
return NULL;
}
int wolfSSH_worker(WOLFSSH* ssh, word32* channelId)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_worker()");
if (ssh == NULL)
ret = WS_BAD_ARGUMENT;
/* Attempt to send any data pending in the outputBuffer. */
if (ret == WS_SUCCESS) {
if (ssh->outputBuffer.length != 0)
ret = wolfSSH_SendPacket(ssh);
}
/* Attempt to receive data from the peer. */
if (ret == WS_SUCCESS)
ret = DoReceive(ssh);
if (ret == WS_CHAN_RXD) {
if (channelId != NULL)
*channelId = ssh->lastRxId;
}
if (ret == WS_CHAN_RXD)
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_worker(), "
"data received on channel %u", ssh->lastRxId);
else
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_worker(), ret = %d", ret);
return ret;
}
int wolfSSH_GetLastRxId(WOLFSSH* ssh, word32* channelId)
{
int ret = WS_SUCCESS;
if (ssh == NULL || channelId == NULL)
ret = WS_ERROR;
if (ret == WS_SUCCESS)
*channelId = ssh->lastRxId;
return ret;
}
#ifdef WOLFSSH_FWD
WOLFSSH_CHANNEL* wolfSSH_ChannelFwdNew(WOLFSSH* ssh,
const char* host, word32 hostPort,
const char* origin, word32 originPort)
{
WOLFSSH_CHANNEL* newChannel = NULL;
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelFwdNew()");
if (ssh == NULL || ssh->ctx == NULL || host == NULL || origin == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS) {
newChannel = ChannelNew(ssh, ID_CHANTYPE_TCPIP_DIRECT,
ssh->ctx->windowSz, ssh->ctx->maxPacketSz);
if (newChannel == NULL)
ret = WS_MEMORY_E;
}
if (ret == WS_SUCCESS)
ret = ChannelUpdateForward(newChannel,
host, hostPort, origin, originPort);
if (ret == WS_SUCCESS)
ret = SendChannelOpenForward(ssh, newChannel);
if (ret != WS_SUCCESS) {
void* heap = (ssh != NULL && ssh->ctx != NULL) ? ssh->ctx->heap : NULL;
ChannelDelete(newChannel, heap);
newChannel = NULL;
}
if (newChannel != NULL)
ChannelAppend(ssh, newChannel);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelFwdNew(), newChannel = %p",
newChannel);
return newChannel;
}
#endif /* WOLFSSH_FWD */
int wolfSSH_ChannelFree(WOLFSSH_CHANNEL* channel)
{
int ret;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelFree()");
if (channel != NULL) {
ret = ChannelRemove(channel->ssh,
channel->channel, WS_CHANNEL_ID_SELF);
}
else
ret = WS_BAD_ARGUMENT;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelFree(), ret = %d", ret);
return ret;
}
int wolfSSH_ChannelGetId(WOLFSSH_CHANNEL* channel, word32* id, byte peer)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelGetId()");
if (channel == NULL || id == NULL)
ret = WS_BAD_ARGUMENT;
else {
*id = (peer == WS_CHANNEL_ID_SELF) ?
channel->channel : channel->peerChannel;
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelGetId(), ret = %d", ret);
return ret;
}
WOLFSSH_CHANNEL* wolfSSH_ChannelFind(WOLFSSH* ssh, word32 id, byte peer)
{
return ChannelFind(ssh, id, peer);
}
#ifdef WOLFSSH_FWD
int wolfSSH_ChannelSetFwdFd(WOLFSSH_CHANNEL* channel, int fwdFd)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelSetFwdFd()");
if (channel != NULL)
channel->fwdFd = fwdFd;
else
ret = WS_BAD_ARGUMENT;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelSetFwdFd(), ret = %d", ret);
return ret;
}
int wolfSSH_ChannelGetFwdFd(const WOLFSSH_CHANNEL* channel)
{
int fwdFd = -1;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelGetFwdFd()");
if (channel != NULL)
fwdFd = channel->fwdFd;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelGetFwdFd(), ret = %d", fwdFd);
return fwdFd;
}
#endif /* WOLFSSH_FWD */
int wolfSSH_ChannelRead(WOLFSSH_CHANNEL* channel, byte* buf, word32 bufSz)
{
Buffer* inputBuffer;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelRead()");
if (channel == NULL || buf == NULL || bufSz == 0)
return WS_BAD_ARGUMENT;
inputBuffer = &channel->inputBuffer;
bufSz = min(bufSz, inputBuffer->length - inputBuffer->idx);
WMEMCPY(buf, inputBuffer->buffer + inputBuffer->idx, bufSz);
inputBuffer->idx += bufSz;
if (!channel->ssh->isKeying &&
(inputBuffer->length > inputBuffer->bufferSz / 2)) {
word32 usedSz = inputBuffer->length - inputBuffer->idx;
word32 bytesToAdd = inputBuffer->idx;
int sendResult;
WLOG(WS_LOG_DEBUG, "Making more room: %u", usedSz);
if (usedSz) {
WLOG(WS_LOG_DEBUG, " ...moving data down");
WMEMMOVE(inputBuffer->buffer,
inputBuffer->buffer + bytesToAdd, usedSz);
}
sendResult = SendChannelWindowAdjust(channel->ssh, channel->channel,
bytesToAdd);
if (sendResult != WS_SUCCESS)
bufSz = sendResult;
WLOG(WS_LOG_INFO, " bytesToAdd = %u", bytesToAdd);
WLOG(WS_LOG_INFO, " windowSz = %u", channel->windowSz);
channel->windowSz += bytesToAdd;
WLOG(WS_LOG_INFO, " update windowSz = %u", channel->windowSz);
inputBuffer->length = usedSz;
inputBuffer->idx = 0;
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelRead(), bytesRxd = %d",
bufSz);
return bufSz;
}
int wolfSSH_ChannelSend(WOLFSSH_CHANNEL* channel,
const byte* buf, word32 bufSz)
{
int bytesTxd = 0;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelSend(), ID = %d, peerID = %d",
channel->channel, channel->peerChannel);
#ifdef DEBUG_WOLFSSH
DumpOctetString(buf, bufSz);
#endif
if (channel == NULL || buf == NULL)
bytesTxd = WS_BAD_ARGUMENT;
else if (!channel->openConfirmed) {
WLOG(WS_LOG_DEBUG, "Channel not confirmed yet.");
bytesTxd = WS_CHANNEL_NOT_CONF;
}
else {
WLOG(WS_LOG_DEBUG, "Sending data.");
bytesTxd = SendChannelData(channel->ssh, channel->channel,
(byte*)buf, bufSz);
}
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelSend(), bytesTxd = %d",
bytesTxd);
return bytesTxd;
}
int wolfSSH_ChannelExit(WOLFSSH_CHANNEL* channel)
{
int ret = WS_SUCCESS;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelExit()");
if (channel == NULL)
ret = WS_BAD_ARGUMENT;
if (ret == WS_SUCCESS)
ret = SendChannelEof(channel->ssh, channel->peerChannel);
if (ret == WS_SUCCESS)
ret = SendChannelClose(channel->ssh, channel->peerChannel);
if (ret == WS_SUCCESS)
ret = ChannelRemove(channel->ssh,
channel->peerChannel, WS_CHANNEL_ID_PEER);
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelExit(), ret = %d", ret);
return ret;
}
WOLFSSH_CHANNEL* wolfSSH_ChannelNext(WOLFSSH* ssh, WOLFSSH_CHANNEL* channel)
{
WOLFSSH_CHANNEL* nextChannel = NULL;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelNext()");
if (ssh != NULL && channel == NULL)
nextChannel = ssh->channelList;
else if (channel != NULL)
nextChannel = channel->next;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelNext(), %s",
nextChannel == NULL ? "none" : "NEXT!");
return nextChannel;
}
int wolfSSH_ChannelGetEof(WOLFSSH_CHANNEL* channel)
{
int eof = 1;
WLOG(WS_LOG_DEBUG, "Entering wolfSSH_ChannelGetEof()");
if (channel)
eof = (int)channel->receivedEof;
WLOG(WS_LOG_DEBUG, "Leaving wolfSSH_ChannelGetEof(), %s",
eof ? "true" : "false");
return eof;
}
#ifdef WOLFSSH_SHOW_SIZES
void wolfSSH_ShowSizes(void)
{
fprintf(stderr, "wolfSSH struct sizes:\n");
fprintf(stderr, " sizeof(struct %s) = %u\n", "WOLFSSH_CTX",
(word32)sizeof(struct WOLFSSH_CTX));
fprintf(stderr, " sizeof(struct %s) = %u\n", "WOLFSSH",
(word32)sizeof(struct WOLFSSH));
fprintf(stderr, " sizeof(struct %s) = %u\n", "HandshakeInfo",
(word32)sizeof(struct HandshakeInfo));
fprintf(stderr, " sizeof(struct %s) = %u\n", "WOLFSSH_CHANNEL",
(word32)sizeof(struct WOLFSSH_CHANNEL));
fprintf(stderr, " sizeof(struct %s) = %u\n", "Buffer",
(word32)sizeof(struct Buffer));
#ifdef WOLFSSH_SFTP
wolfSSH_SFTP_ShowSizes();
#endif
}
#endif /* WOLFSSH_SHOW_SIZES */
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