Unix SMB/CIFS implementation.
SMB client generic functions
Copyright (C) Andrew Tridgell 1994-1998
+ Copyright (C) Jeremy Allison 2007.
This program 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 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
*MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
The timeout is in milliseconds
- This is exactly the same as receive_smb except that it never returns
+ This is exactly the same as receive_smb except that it can be set to never return
a session keepalive packet (just as receive_smb used to do).
receive_smb was changed to return keepalives as the oplock processing means this call
should never go into a blocking read.
****************************************************************************/
-static BOOL client_receive_smb(struct cli_state *cli)
+static ssize_t client_receive_smb(struct cli_state *cli, BOOL eat_keepalives, size_t maxlen)
{
- BOOL ret;
- NTSTATUS status;
+ ssize_t len;
int fd = cli->fd;
char *buffer = cli->inbuf;
unsigned int timeout = cli->timeout;
for(;;) {
- ret = receive_smb_raw(fd, buffer, timeout);
+ len = receive_smb_raw(fd, buffer, timeout, maxlen);
- if (!ret) {
+ if (len < 0) {
DEBUG(10,("client_receive_smb failed\n"));
show_msg(buffer);
- return ret;
+ return len;
}
/* Ignore session keepalive packets. */
- if(CVAL(buffer,0) != SMBkeepalive)
- break;
+ if (eat_keepalives && (CVAL(buffer,0) == SMBkeepalive)) {
+ continue;
+ }
+ break;
}
- status = cli_decrypt_message(cli);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
- nt_errstr(status)));
- cli->smb_rw_error = READ_BAD_DECRYPT;
- close(cli->fd);
- cli->fd = -1;
- return False;
+
+ if (cli_encryption_on(cli)) {
+ NTSTATUS status = cli_decrypt_message(cli);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
+ nt_errstr(status)));
+ cli->smb_rw_error = READ_BAD_DECRYPT;
+ close(cli->fd);
+ cli->fd = -1;
+ return -1;
+ }
}
show_msg(buffer);
- return ret;
+ return len;
}
/****************************************************************************
Recv an smb.
****************************************************************************/
-BOOL cli_receive_smb(struct cli_state *cli)
+BOOL cli_receive_smb_internal(struct cli_state *cli, BOOL eat_keepalives)
{
- BOOL ret;
+ ssize_t len;
/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
if (cli->fd == -1)
return False;
again:
- ret = client_receive_smb(cli);
+ len = client_receive_smb(cli, eat_keepalives, 0);
+
+ if (len >= 0 && !eat_keepalives && (CVAL(cli->inbuf,0) == SMBkeepalive)) {
+ /* Give back the keepalive. */
+ return True;
+ }
- if (ret) {
+ if (len > 0) {
/* it might be an oplock break request */
if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
CVAL(cli->inbuf,smb_com) == SMBlockingX &&
if (cli->oplock_handler) {
int fnum = SVAL(cli->inbuf,smb_vwv2);
unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
- if (!cli->oplock_handler(cli, fnum, level)) return False;
+ if (!cli->oplock_handler(cli, fnum, level)) {
+ return False;
+ }
}
/* try to prevent loops */
SCVAL(cli->inbuf,smb_com,0xFF);
}
/* If the server is not responding, note that now */
- if (!ret) {
+ if (len < 0) {
DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
cli->smb_rw_error = smb_read_error;
close(cli->fd);
cli->fd = -1;
- return ret;
+ return False;
}
if (!cli_check_sign_mac(cli)) {
+ /*
+ * If we get a signature failure in sessionsetup, then
+ * the server sometimes just reflects the sent signature
+ * back to us. Detect this and allow the upper layer to
+ * retrieve the correct Windows error message.
+ */
+ if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
+ (smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
+ (SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
+ memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
+ cli_is_error(cli)) {
+
+ /*
+ * Reflected signature on login error.
+ * Set bad sig but don't close fd.
+ */
+ cli->smb_rw_error = READ_BAD_SIG;
+ return True;
+ }
+
DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
cli->smb_rw_error = READ_BAD_SIG;
close(cli->fd);
cli->fd = -1;
return False;
- };
+ }
+
+ return True;
+}
+
+/****************************************************************************
+ Recv an smb - eat keepalives.
+****************************************************************************/
+
+BOOL cli_receive_smb(struct cli_state *cli)
+{
+ return cli_receive_smb_internal(cli, True);
+}
+
+/****************************************************************************
+ Recv an smb - return keepalives.
+****************************************************************************/
+
+BOOL cli_receive_smb_return_keepalive(struct cli_state *cli)
+{
+ return cli_receive_smb_internal(cli, False);
+}
+
+/****************************************************************************
+ Read the data portion of a readX smb.
+ The timeout is in milliseconds
+****************************************************************************/
+
+ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
+{
+ if (cli->timeout > 0) {
+ return read_socket_with_timeout(cli->fd, buffer, len, len, cli->timeout);
+ } else {
+ return read_data(cli->fd, buffer, len);
+ }
+}
+
+/****************************************************************************
+ Read a smb readX header.
+ We can only use this if encryption and signing are off.
+****************************************************************************/
+
+BOOL cli_receive_smb_readX_header(struct cli_state *cli)
+{
+ ssize_t len, offset;
+
+ if (cli->fd == -1)
+ return False;
+
+ again:
+
+ /* Read up to the size of a readX header reply. */
+ len = client_receive_smb(cli, True, (smb_size - 4) + 24);
+
+ if (len > 0) {
+ /* it might be an oplock break request */
+ if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
+ CVAL(cli->inbuf,smb_com) == SMBlockingX &&
+ SVAL(cli->inbuf,smb_vwv6) == 0 &&
+ SVAL(cli->inbuf,smb_vwv7) == 0) {
+ ssize_t total_len = smb_len(cli->inbuf);
+
+ if (total_len > CLI_SAMBA_MAX_LARGE_READX_SIZE+SAFETY_MARGIN) {
+ goto read_err;
+ }
+
+ /* Read the rest of the data. */
+ if ((total_len - len > 0) &&
+ !cli_receive_smb_data(cli,cli->inbuf+len,total_len - len)) {
+ goto read_err;
+ }
+
+ if (cli->oplock_handler) {
+ int fnum = SVAL(cli->inbuf,smb_vwv2);
+ unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
+ if (!cli->oplock_handler(cli, fnum, level)) return False;
+ }
+ /* try to prevent loops */
+ SCVAL(cli->inbuf,smb_com,0xFF);
+ goto again;
+ }
+ }
+
+ /* If it's not the above size it probably was an error packet. */
+
+ if ((len == (smb_size - 4) + 24) && !cli_is_error(cli)) {
+ /* Check it's a non-chained readX reply. */
+ if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) ||
+ (CVAL(cli->inbuf,smb_vwv0) != 0xFF) ||
+ (CVAL(cli->inbuf,smb_com) != SMBreadX)) {
+ /*
+ * We're not coping here with asnyc replies to
+ * other calls. Punt here - we need async client
+ * libs for this.
+ */
+ goto read_err;
+ }
+
+ /*
+ * We know it's a readX reply - ensure we've read the
+ * padding bytes also.
+ */
+
+ offset = SVAL(cli->inbuf,smb_vwv6);
+ if (offset > len) {
+ ssize_t ret;
+ size_t padbytes = offset - len;
+ ret = cli_receive_smb_data(cli,smb_buf(cli->inbuf),padbytes);
+ if (ret != padbytes) {
+ goto read_err;
+ }
+ }
+ }
+
return True;
+
+ read_err:
+
+ cli->smb_rw_error = smb_read_error = READ_ERROR;
+ close(cli->fd);
+ cli->fd = -1;
+ return False;
}
static ssize_t write_socket(int fd, const char *buf, size_t len)
BOOL cli_send_smb(struct cli_state *cli)
{
- NTSTATUS status;
size_t len;
size_t nwritten=0;
ssize_t ret;
+ char *buf_out = cli->outbuf;
+ BOOL enc_on = cli_encryption_on(cli);
/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
if (cli->fd == -1) {
cli_calculate_sign_mac(cli);
- status = cli_encrypt_message(cli);
- if (!NT_STATUS_IS_OK(status)) {
- close(cli->fd);
- cli->fd = -1;
- cli->smb_rw_error = WRITE_ERROR;
- DEBUG(0,("Error in encrypting client message. Error %s\n",
- nt_errstr(status) ));
- return False;
+ if (enc_on) {
+ NTSTATUS status = cli_encrypt_message(cli, &buf_out);
+ if (!NT_STATUS_IS_OK(status)) {
+ close(cli->fd);
+ cli->fd = -1;
+ cli->smb_rw_error = WRITE_ERROR;
+ DEBUG(0,("Error in encrypting client message. Error %s\n",
+ nt_errstr(status) ));
+ return False;
+ }
}
- len = smb_len(cli->outbuf) + 4;
+ len = smb_len(buf_out) + 4;
while (nwritten < len) {
- ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
+ ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
if (ret <= 0) {
+ if (enc_on) {
+ cli_free_enc_buffer(cli, buf_out);
+ }
close(cli->fd);
cli->fd = -1;
cli->smb_rw_error = WRITE_ERROR;
}
nwritten += ret;
}
+
+ cli_free_enc_buffer(cli, buf_out);
+
/* Increment the mid so we can tell between responses. */
cli->mid++;
if (!cli->mid) {
void cli_setup_bcc(struct cli_state *cli, void *p)
{
- set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
+ set_message_bcc(NULL,cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
}
/****************************************************************************
SAFE_FREE(cli->inbuf);
cli_free_signing_context(cli);
+ cli_free_encryption_context(cli);
+
data_blob_free(&cli->secblob);
data_blob_free(&cli->user_session_key);
SMB_ASSERT(length < 1024);
memset(cli->outbuf,'\0',smb_size);
- set_message(cli->outbuf,1,length,True);
+ set_message(NULL,cli->outbuf,1,length,True);
SCVAL(cli->outbuf,smb_com,SMBecho);
SSVAL(cli->outbuf,smb_tid,65535);
SSVAL(cli->outbuf,smb_vwv0,1);
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