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1c02a4e874
curl/lib/smb.c
Daniel Stenberg 6de1053692
smb: check for full size message before reading message details 
To avoid reading of uninitialized data.

Assisted-by: Max Dymond
Bug: https://crbug.com/oss-fuzz/16907
Closes #4363
2019-09-16 14:16:06 +02:00

1002 lines
28 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2014, Bill Nagel <wnagel@tycoint.com>, Exacq Technologies
* Copyright (C) 2016-2019, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_SMB) && defined(USE_NTLM) && \
(CURL_SIZEOF_CURL_OFF_T > 4)
#if !defined(USE_WINDOWS_SSPI) || defined(USE_WIN32_CRYPTO)
#define BUILDING_CURL_SMB_C
#ifdef HAVE_PROCESS_H
#include <process.h>
#ifdef CURL_WINDOWS_APP
#define getpid GetCurrentProcessId
#elif !defined(MSDOS)
#define getpid _getpid
#endif
#endif
#include "smb.h"
#include "urldata.h"
#include "sendf.h"
#include "multiif.h"
#include "connect.h"
#include "progress.h"
#include "transfer.h"
#include "vtls/vtls.h"
#include "curl_ntlm_core.h"
#include "escape.h"
#include "curl_endian.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
/* Local API functions */
static CURLcode smb_setup_connection(struct connectdata *conn);
static CURLcode smb_connect(struct connectdata *conn, bool *done);
static CURLcode smb_connection_state(struct connectdata *conn, bool *done);
static CURLcode smb_do(struct connectdata *conn, bool *done);
static CURLcode smb_request_state(struct connectdata *conn, bool *done);
static CURLcode smb_done(struct connectdata *conn, CURLcode status,
bool premature);
static CURLcode smb_disconnect(struct connectdata *conn, bool dead);
static int smb_getsock(struct connectdata *conn, curl_socket_t *socks);
static CURLcode smb_parse_url_path(struct connectdata *conn);
/*
* SMB handler interface
*/
const struct Curl_handler Curl_handler_smb = {
"SMB", /* scheme */
smb_setup_connection, /* setup_connection */
smb_do, /* do_it */
smb_done, /* done */
ZERO_NULL, /* do_more */
smb_connect, /* connect_it */
smb_connection_state, /* connecting */
smb_request_state, /* doing */
smb_getsock, /* proto_getsock */
smb_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smb_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
PORT_SMB, /* defport */
CURLPROTO_SMB, /* protocol */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
/*
* SMBS handler interface
*/
const struct Curl_handler Curl_handler_smbs = {
"SMBS", /* scheme */
smb_setup_connection, /* setup_connection */
smb_do, /* do_it */
smb_done, /* done */
ZERO_NULL, /* do_more */
smb_connect, /* connect_it */
smb_connection_state, /* connecting */
smb_request_state, /* doing */
smb_getsock, /* proto_getsock */
smb_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smb_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
PORT_SMBS, /* defport */
CURLPROTO_SMBS, /* protocol */
PROTOPT_SSL /* flags */
};
#endif
#define MAX_PAYLOAD_SIZE 0x8000
#define MAX_MESSAGE_SIZE (MAX_PAYLOAD_SIZE + 0x1000)
#define CLIENTNAME "curl"
#define SERVICENAME "?????"
/* Append a string to an SMB message */
#define MSGCAT(str) \
strcpy(p, (str)); \
p += strlen(str);
/* Append a null-terminated string to an SMB message */
#define MSGCATNULL(str) \
strcpy(p, (str)); \
p += strlen(str) + 1;
/* SMB is mostly little endian */
#if (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
defined(__OS400__)
static unsigned short smb_swap16(unsigned short x)
{
return (unsigned short) ((x << 8) | ((x >> 8) & 0xff));
}
static unsigned int smb_swap32(unsigned int x)
{
return (x << 24) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) |
((x >> 24) & 0xff);
}
static curl_off_t smb_swap64(curl_off_t x)
{
return ((curl_off_t) smb_swap32((unsigned int) x) << 32) |
smb_swap32((unsigned int) (x >> 32));
}
#else
# define smb_swap16(x) (x)
# define smb_swap32(x) (x)
# define smb_swap64(x) (x)
#endif
/* SMB request state */
enum smb_req_state {
SMB_REQUESTING,
SMB_TREE_CONNECT,
SMB_OPEN,
SMB_DOWNLOAD,
SMB_UPLOAD,
SMB_CLOSE,
SMB_TREE_DISCONNECT,
SMB_DONE
};
/* SMB request data */
struct smb_request {
enum smb_req_state state;
char *path;
unsigned short tid; /* Even if we connect to the same tree as another */
unsigned short fid; /* request, the tid will be different */
CURLcode result;
};
static void conn_state(struct connectdata *conn, enum smb_conn_state newstate)
{
struct smb_conn *smbc = &conn->proto.smbc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* For debug purposes */
static const char * const names[] = {
"SMB_NOT_CONNECTED",
"SMB_CONNECTING",
"SMB_NEGOTIATE",
"SMB_SETUP",
"SMB_CONNECTED",
/* LAST */
};
if(smbc->state != newstate)
infof(conn->data, "SMB conn %p state change from %s to %s\n",
(void *)smbc, names[smbc->state], names[newstate]);
#endif
smbc->state = newstate;
}
static void request_state(struct connectdata *conn,
enum smb_req_state newstate)
{
struct smb_request *req = conn->data->req.protop;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* For debug purposes */
static const char * const names[] = {
"SMB_REQUESTING",
"SMB_TREE_CONNECT",
"SMB_OPEN",
"SMB_DOWNLOAD",
"SMB_UPLOAD",
"SMB_CLOSE",
"SMB_TREE_DISCONNECT",
"SMB_DONE",
/* LAST */
};
if(req->state != newstate)
infof(conn->data, "SMB request %p state change from %s to %s\n",
(void *)req, names[req->state], names[newstate]);
#endif
req->state = newstate;
}
/* this should setup things in the connection, not in the easy
handle */
static CURLcode smb_setup_connection(struct connectdata *conn)
{
struct smb_request *req;
/* Initialize the request state */
conn->data->req.protop = req = calloc(1, sizeof(struct smb_request));
if(!req)
return CURLE_OUT_OF_MEMORY;
/* Parse the URL path */
return smb_parse_url_path(conn);
}
static CURLcode smb_connect(struct connectdata *conn, bool *done)
{
struct smb_conn *smbc = &conn->proto.smbc;
char *slash;
(void) done;
/* Check we have a username and password to authenticate with */
if(!conn->bits.user_passwd)
return CURLE_LOGIN_DENIED;
/* Initialize the connection state */
smbc->state = SMB_CONNECTING;
smbc->recv_buf = malloc(MAX_MESSAGE_SIZE);
if(!smbc->recv_buf)
return CURLE_OUT_OF_MEMORY;
/* Multiple requests are allowed with this connection */
connkeep(conn, "SMB default");
/* Parse the username, domain, and password */
slash = strchr(conn->user, '/');
if(!slash)
slash = strchr(conn->user, '\\');
if(slash) {
smbc->user = slash + 1;
smbc->domain = strdup(conn->user);
if(!smbc->domain)
return CURLE_OUT_OF_MEMORY;
smbc->domain[slash - conn->user] = 0;
}
else {
smbc->user = conn->user;
smbc->domain = strdup(conn->host.name);
if(!smbc->domain)
return CURLE_OUT_OF_MEMORY;
}
return CURLE_OK;
}
static CURLcode smb_recv_message(struct connectdata *conn, void **msg)
{
struct smb_conn *smbc = &conn->proto.smbc;
char *buf = smbc->recv_buf;
ssize_t bytes_read;
size_t nbt_size;
size_t msg_size;
size_t len = MAX_MESSAGE_SIZE - smbc->got;
CURLcode result;
result = Curl_read(conn, FIRSTSOCKET, buf + smbc->got, len, &bytes_read);
if(result)
return result;
if(!bytes_read)
return CURLE_OK;
smbc->got += bytes_read;
/* Check for a 32-bit nbt header */
if(smbc->got < sizeof(unsigned int))
return CURLE_OK;
nbt_size = Curl_read16_be((const unsigned char *)
(buf + sizeof(unsigned short))) +
sizeof(unsigned int);
if(smbc->got < nbt_size)
return CURLE_OK;
msg_size = sizeof(struct smb_header);
if(nbt_size >= msg_size + 1) {
/* Add the word count */
msg_size += 1 + ((unsigned char) buf[msg_size]) * sizeof(unsigned short);
if(nbt_size >= msg_size + sizeof(unsigned short)) {
/* Add the byte count */
msg_size += sizeof(unsigned short) +
Curl_read16_le((const unsigned char *)&buf[msg_size]);
if(nbt_size < msg_size)
return CURLE_READ_ERROR;
}
}
*msg = buf;
return CURLE_OK;
}
static void smb_pop_message(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
smbc->got = 0;
}
static void smb_format_message(struct connectdata *conn, struct smb_header *h,
unsigned char cmd, size_t len)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_request *req = conn->data->req.protop;
unsigned int pid;
memset(h, 0, sizeof(*h));
h->nbt_length = htons((unsigned short) (sizeof(*h) - sizeof(unsigned int) +
len));
memcpy((char *)h->magic, "\xffSMB", 4);
h->command = cmd;
h->flags = SMB_FLAGS_CANONICAL_PATHNAMES | SMB_FLAGS_CASELESS_PATHNAMES;
h->flags2 = smb_swap16(SMB_FLAGS2_IS_LONG_NAME | SMB_FLAGS2_KNOWS_LONG_NAME);
h->uid = smb_swap16(smbc->uid);
h->tid = smb_swap16(req->tid);
pid = getpid();
h->pid_high = smb_swap16((unsigned short)(pid >> 16));
h->pid = smb_swap16((unsigned short) pid);
}
static CURLcode smb_send(struct connectdata *conn, ssize_t len,
size_t upload_size)
{
struct smb_conn *smbc = &conn->proto.smbc;
ssize_t bytes_written;
CURLcode result;
result = Curl_write(conn, FIRSTSOCKET, conn->data->state.ulbuf,
len, &bytes_written);
if(result)
return result;
if(bytes_written != len) {
smbc->send_size = len;
smbc->sent = bytes_written;
}
smbc->upload_size = upload_size;
return CURLE_OK;
}
static CURLcode smb_flush(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
ssize_t bytes_written;
ssize_t len = smbc->send_size - smbc->sent;
CURLcode result;
if(!smbc->send_size)
return CURLE_OK;
result = Curl_write(conn, FIRSTSOCKET,
conn->data->state.ulbuf + smbc->sent,
len, &bytes_written);
if(result)
return result;
if(bytes_written != len)
smbc->sent += bytes_written;
else
smbc->send_size = 0;
return CURLE_OK;
}
static CURLcode smb_send_message(struct connectdata *conn, unsigned char cmd,
const void *msg, size_t msg_len)
{
CURLcode result = Curl_get_upload_buffer(conn->data);
if(result)
return result;
smb_format_message(conn, (struct smb_header *)conn->data->state.ulbuf,
cmd, msg_len);
memcpy(conn->data->state.ulbuf + sizeof(struct smb_header),
msg, msg_len);
return smb_send(conn, sizeof(struct smb_header) + msg_len, 0);
}
static CURLcode smb_send_negotiate(struct connectdata *conn)
{
const char *msg = "\x00\x0c\x00\x02NT LM 0.12";
return smb_send_message(conn, SMB_COM_NEGOTIATE, msg, 15);
}
static CURLcode smb_send_setup(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_setup msg;
char *p = msg.bytes;
unsigned char lm_hash[21];
unsigned char lm[24];
unsigned char nt_hash[21];
unsigned char nt[24];
size_t byte_count = sizeof(lm) + sizeof(nt);
byte_count += strlen(smbc->user) + strlen(smbc->domain);
byte_count += strlen(OS) + strlen(CLIENTNAME) + 4; /* 4 null chars */
if(byte_count > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
Curl_ntlm_core_mk_lm_hash(conn->data, conn->passwd, lm_hash);
Curl_ntlm_core_lm_resp(lm_hash, smbc->challenge, lm);
#ifdef USE_NTRESPONSES
Curl_ntlm_core_mk_nt_hash(conn->data, conn->passwd, nt_hash);
Curl_ntlm_core_lm_resp(nt_hash, smbc->challenge, nt);
#else
memset(nt, 0, sizeof(nt));
#endif
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_SETUP_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.max_buffer_size = smb_swap16(MAX_MESSAGE_SIZE);
msg.max_mpx_count = smb_swap16(1);
msg.vc_number = smb_swap16(1);
msg.session_key = smb_swap32(smbc->session_key);
msg.capabilities = smb_swap32(SMB_CAP_LARGE_FILES);
msg.lengths[0] = smb_swap16(sizeof(lm));
msg.lengths[1] = smb_swap16(sizeof(nt));
memcpy(p, lm, sizeof(lm));
p += sizeof(lm);
memcpy(p, nt, sizeof(nt));
p += sizeof(nt);
MSGCATNULL(smbc->user);
MSGCATNULL(smbc->domain);
MSGCATNULL(OS);
MSGCATNULL(CLIENTNAME);
byte_count = p - msg.bytes;
msg.byte_count = smb_swap16((unsigned short)byte_count);
return smb_send_message(conn, SMB_COM_SETUP_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_tree_connect(struct connectdata *conn)
{
struct smb_tree_connect msg;
struct smb_conn *smbc = &conn->proto.smbc;
char *p = msg.bytes;
size_t byte_count = strlen(conn->host.name) + strlen(smbc->share);
byte_count += strlen(SERVICENAME) + 5; /* 2 nulls and 3 backslashes */
if(byte_count > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_TREE_CONNECT_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.pw_len = 0;
MSGCAT("\\\\");
MSGCAT(conn->host.name);
MSGCAT("\\");
MSGCATNULL(smbc->share);
MSGCATNULL(SERVICENAME); /* Match any type of service */
byte_count = p - msg.bytes;
msg.byte_count = smb_swap16((unsigned short)byte_count);
return smb_send_message(conn, SMB_COM_TREE_CONNECT_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_open(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
struct smb_nt_create msg;
size_t byte_count;
if((strlen(req->path) + 1) > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_NT_CREATE_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
byte_count = strlen(req->path);
msg.name_length = smb_swap16((unsigned short)byte_count);
msg.share_access = smb_swap32(SMB_FILE_SHARE_ALL);
if(conn->data->set.upload) {
msg.access = smb_swap32(SMB_GENERIC_READ | SMB_GENERIC_WRITE);
msg.create_disposition = smb_swap32(SMB_FILE_OVERWRITE_IF);
}
else {
msg.access = smb_swap32(SMB_GENERIC_READ);
msg.create_disposition = smb_swap32(SMB_FILE_OPEN);
}
msg.byte_count = smb_swap16((unsigned short) ++byte_count);
strcpy(msg.bytes, req->path);
return smb_send_message(conn, SMB_COM_NT_CREATE_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_close(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
struct smb_close msg;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_CLOSE;
msg.fid = smb_swap16(req->fid);
return smb_send_message(conn, SMB_COM_CLOSE, &msg, sizeof(msg));
}
static CURLcode smb_send_tree_disconnect(struct connectdata *conn)
{
struct smb_tree_disconnect msg;
memset(&msg, 0, sizeof(msg));
return smb_send_message(conn, SMB_COM_TREE_DISCONNECT, &msg, sizeof(msg));
}
static CURLcode smb_send_read(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
curl_off_t offset = conn->data->req.offset;
struct smb_read msg;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_READ_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.fid = smb_swap16(req->fid);
msg.offset = smb_swap32((unsigned int) offset);
msg.offset_high = smb_swap32((unsigned int) (offset >> 32));
msg.min_bytes = smb_swap16(MAX_PAYLOAD_SIZE);
msg.max_bytes = smb_swap16(MAX_PAYLOAD_SIZE);
return smb_send_message(conn, SMB_COM_READ_ANDX, &msg, sizeof(msg));
}
static CURLcode smb_send_write(struct connectdata *conn)
{
struct smb_write *msg;
struct smb_request *req = conn->data->req.protop;
curl_off_t offset = conn->data->req.offset;
curl_off_t upload_size = conn->data->req.size - conn->data->req.bytecount;
CURLcode result = Curl_get_upload_buffer(conn->data);
if(result)
return result;
msg = (struct smb_write *)conn->data->state.ulbuf;
if(upload_size >= MAX_PAYLOAD_SIZE - 1) /* There is one byte of padding */
upload_size = MAX_PAYLOAD_SIZE - 1;
memset(msg, 0, sizeof(*msg));
msg->word_count = SMB_WC_WRITE_ANDX;
msg->andx.command = SMB_COM_NO_ANDX_COMMAND;
msg->fid = smb_swap16(req->fid);
msg->offset = smb_swap32((unsigned int) offset);
msg->offset_high = smb_swap32((unsigned int) (offset >> 32));
msg->data_length = smb_swap16((unsigned short) upload_size);
msg->data_offset = smb_swap16(sizeof(*msg) - sizeof(unsigned int));
msg->byte_count = smb_swap16((unsigned short) (upload_size + 1));
smb_format_message(conn, &msg->h, SMB_COM_WRITE_ANDX,
sizeof(*msg) - sizeof(msg->h) + (size_t) upload_size);
return smb_send(conn, sizeof(*msg), (size_t) upload_size);
}
static CURLcode smb_send_and_recv(struct connectdata *conn, void **msg)
{
struct smb_conn *smbc = &conn->proto.smbc;
CURLcode result;
*msg = NULL; /* if it returns early */
/* Check if there is data in the transfer buffer */
if(!smbc->send_size && smbc->upload_size) {
size_t nread = smbc->upload_size > conn->data->set.upload_buffer_size ?
conn->data->set.upload_buffer_size :
smbc->upload_size;
conn->data->req.upload_fromhere = conn->data->state.ulbuf;
result = Curl_fillreadbuffer(conn, nread, &nread);
if(result && result != CURLE_AGAIN)
return result;
if(!nread)
return CURLE_OK;
smbc->upload_size -= nread;
smbc->send_size = nread;
smbc->sent = 0;
}
/* Check if there is data to send */
if(smbc->send_size) {
result = smb_flush(conn);
if(result)
return result;
}
/* Check if there is still data to be sent */
if(smbc->send_size || smbc->upload_size)
return CURLE_AGAIN;
return smb_recv_message(conn, msg);
}
static CURLcode smb_connection_state(struct connectdata *conn, bool *done)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_negotiate_response *nrsp;
struct smb_header *h;
CURLcode result;
void *msg = NULL;
if(smbc->state == SMB_CONNECTING) {
#ifdef USE_SSL
if((conn->handler->flags & PROTOPT_SSL)) {
bool ssl_done = FALSE;
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &ssl_done);
if(result && result != CURLE_AGAIN)
return result;
if(!ssl_done)
return CURLE_OK;
}
#endif
result = smb_send_negotiate(conn);
if(result) {
connclose(conn, "SMB: failed to send negotiate message");
return result;
}
conn_state(conn, SMB_NEGOTIATE);
}
/* Send the previous message and check for a response */
result = smb_send_and_recv(conn, &msg);
if(result && result != CURLE_AGAIN) {
connclose(conn, "SMB: failed to communicate");
return result;
}
if(!msg)
return CURLE_OK;
h = msg;
switch(smbc->state) {
case SMB_NEGOTIATE:
if((smbc->got < sizeof(*nrsp) + sizeof(smbc->challenge) - 1) ||
h->status) {
connclose(conn, "SMB: negotiation failed");
return CURLE_COULDNT_CONNECT;
}
nrsp = msg;
memcpy(smbc->challenge, nrsp->bytes, sizeof(smbc->challenge));
smbc->session_key = smb_swap32(nrsp->session_key);
result = smb_send_setup(conn);
if(result) {
connclose(conn, "SMB: failed to send setup message");
return result;
}
conn_state(conn, SMB_SETUP);
break;
case SMB_SETUP:
if(h->status) {
connclose(conn, "SMB: authentication failed");
return CURLE_LOGIN_DENIED;
}
smbc->uid = smb_swap16(h->uid);
conn_state(conn, SMB_CONNECTED);
*done = true;
break;
default:
smb_pop_message(conn);
return CURLE_OK; /* ignore */
}
smb_pop_message(conn);
return CURLE_OK;
}
/*
* Convert a timestamp from the Windows world (100 nsec units from 1 Jan 1601)
* to Posix time. Cap the output to fit within a time_t.
*/
static void get_posix_time(time_t *out, curl_off_t timestamp)
{
timestamp -= 116444736000000000;
timestamp /= 10000000;
#if SIZEOF_TIME_T < SIZEOF_CURL_OFF_T
if(timestamp > TIME_T_MAX)
*out = TIME_T_MAX;
else if(timestamp < TIME_T_MIN)
*out = TIME_T_MIN;
else
#endif
*out = (time_t) timestamp;
}
static CURLcode smb_request_state(struct connectdata *conn, bool *done)
{
struct smb_request *req = conn->data->req.protop;
struct smb_header *h;
struct smb_conn *smbc = &conn->proto.smbc;
enum smb_req_state next_state = SMB_DONE;
unsigned short len;
unsigned short off;
CURLcode result;
void *msg = NULL;
const struct smb_nt_create_response *smb_m;
/* Start the request */
if(req->state == SMB_REQUESTING) {
result = smb_send_tree_connect(conn);
if(result) {
connclose(conn, "SMB: failed to send tree connect message");
return result;
}
request_state(conn, SMB_TREE_CONNECT);
}
/* Send the previous message and check for a response */
result = smb_send_and_recv(conn, &msg);
if(result && result != CURLE_AGAIN) {
connclose(conn, "SMB: failed to communicate");
return result;
}
if(!msg)
return CURLE_OK;
h = msg;
switch(req->state) {
case SMB_TREE_CONNECT:
if(h->status) {
req->result = CURLE_REMOTE_FILE_NOT_FOUND;
if(h->status == smb_swap32(SMB_ERR_NOACCESS))
req->result = CURLE_REMOTE_ACCESS_DENIED;
break;
}
req->tid = smb_swap16(h->tid);
next_state = SMB_OPEN;
break;
case SMB_OPEN:
if(h->status || smbc->got < sizeof(struct smb_nt_create_response)) {
req->result = CURLE_REMOTE_FILE_NOT_FOUND;
if(h->status == smb_swap32(SMB_ERR_NOACCESS))
req->result = CURLE_REMOTE_ACCESS_DENIED;
next_state = SMB_TREE_DISCONNECT;
break;
}
smb_m = (const struct smb_nt_create_response*) msg;
req->fid = smb_swap16(smb_m->fid);
conn->data->req.offset = 0;
if(conn->data->set.upload) {
conn->data->req.size = conn->data->state.infilesize;
Curl_pgrsSetUploadSize(conn->data, conn->data->req.size);
next_state = SMB_UPLOAD;
}
else {
smb_m = (const struct smb_nt_create_response*) msg;
conn->data->req.size = smb_swap64(smb_m->end_of_file);
if(conn->data->req.size < 0) {
req->result = CURLE_WEIRD_SERVER_REPLY;
next_state = SMB_CLOSE;
}
else {
Curl_pgrsSetDownloadSize(conn->data, conn->data->req.size);
if(conn->data->set.get_filetime)
get_posix_time(&conn->data->info.filetime, smb_m->last_change_time);
next_state = SMB_DOWNLOAD;
}
}
break;
case SMB_DOWNLOAD:
if(h->status || smbc->got < sizeof(struct smb_header) + 14) {
req->result = CURLE_RECV_ERROR;
next_state = SMB_CLOSE;
break;
}
len = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 11);
off = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 13);
if(len > 0) {
if(off + sizeof(unsigned int) + len > smbc->got) {
failf(conn->data, "Invalid input packet");
result = CURLE_RECV_ERROR;
}
else
result = Curl_client_write(conn, CLIENTWRITE_BODY,
(char *)msg + off + sizeof(unsigned int),
len);
if(result) {
req->result = result;
next_state = SMB_CLOSE;
break;
}
}
conn->data->req.bytecount += len;
conn->data->req.offset += len;
Curl_pgrsSetDownloadCounter(conn->data, conn->data->req.bytecount);
next_state = (len < MAX_PAYLOAD_SIZE) ? SMB_CLOSE : SMB_DOWNLOAD;
break;
case SMB_UPLOAD:
if(h->status || smbc->got < sizeof(struct smb_header) + 6) {
req->result = CURLE_UPLOAD_FAILED;
next_state = SMB_CLOSE;
break;
}
len = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 5);
conn->data->req.bytecount += len;
conn->data->req.offset += len;
Curl_pgrsSetUploadCounter(conn->data, conn->data->req.bytecount);
if(conn->data->req.bytecount >= conn->data->req.size)
next_state = SMB_CLOSE;
else
next_state = SMB_UPLOAD;
break;
case SMB_CLOSE:
/* We don't care if the close failed, proceed to tree disconnect anyway */
next_state = SMB_TREE_DISCONNECT;
break;
case SMB_TREE_DISCONNECT:
next_state = SMB_DONE;
break;
default:
smb_pop_message(conn);
return CURLE_OK; /* ignore */
}
smb_pop_message(conn);
switch(next_state) {
case SMB_OPEN:
result = smb_send_open(conn);
break;
case SMB_DOWNLOAD:
result = smb_send_read(conn);
break;
case SMB_UPLOAD:
result = smb_send_write(conn);
break;
case SMB_CLOSE:
result = smb_send_close(conn);
break;
case SMB_TREE_DISCONNECT:
result = smb_send_tree_disconnect(conn);
break;
case SMB_DONE:
result = req->result;
*done = true;
break;
default:
break;
}
if(result) {
connclose(conn, "SMB: failed to send message");
return result;
}
request_state(conn, next_state);
return CURLE_OK;
}
static CURLcode smb_done(struct connectdata *conn, CURLcode status,
bool premature)
{
(void) premature;
Curl_safefree(conn->data->req.protop);
return status;
}
static CURLcode smb_disconnect(struct connectdata *conn, bool dead)
{
struct smb_conn *smbc = &conn->proto.smbc;
(void) dead;
Curl_safefree(smbc->share);
Curl_safefree(smbc->domain);
Curl_safefree(smbc->recv_buf);
return CURLE_OK;
}
static int smb_getsock(struct connectdata *conn, curl_socket_t *socks)
{
socks[0] = conn->sock[FIRSTSOCKET];
return GETSOCK_READSOCK(0) | GETSOCK_WRITESOCK(0);
}
static CURLcode smb_do(struct connectdata *conn, bool *done)
{
struct smb_conn *smbc = &conn->proto.smbc;
*done = FALSE;
if(smbc->share) {
return CURLE_OK;
}
return CURLE_URL_MALFORMAT;
}
static CURLcode smb_parse_url_path(struct connectdata *conn)
{
struct Curl_easy *data = conn->data;
struct smb_request *req = data->req.protop;
struct smb_conn *smbc = &conn->proto.smbc;
char *path;
char *slash;
/* URL decode the path */
CURLcode result = Curl_urldecode(data, data->state.up.path, 0, &path, NULL,
TRUE);
if(result)
return result;
/* Parse the path for the share */
smbc->share = strdup((*path == '/' || *path == '\\') ? path + 1 : path);
free(path);
if(!smbc->share)
return CURLE_OUT_OF_MEMORY;
slash = strchr(smbc->share, '/');
if(!slash)
slash = strchr(smbc->share, '\\');
/* The share must be present */
if(!slash) {
Curl_safefree(smbc->share);
return CURLE_URL_MALFORMAT;
}
/* Parse the path for the file path converting any forward slashes into
backslashes */
*slash++ = 0;
req->path = slash;
for(; *slash; slash++) {
if(*slash == '/')
*slash = '\\';
}
return CURLE_OK;
}
#endif /* !USE_WINDOWS_SSPI || USE_WIN32_CRYPTO */
#endif /* CURL_DISABLE_SMB && USE_NTLM && CURL_SIZEOF_CURL_OFF_T > 4 */
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