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author	Stefan Metzmacher <metze@samba.org>	2011-11-02 19:07:45 +0100
committer	Stefan Metzmacher <metze@samba.org>	2011-11-03 16:55:13 +0100
commit	caa134672c053f56360ef602b7f8b9d66b216ad3 (patch)
tree	318f702fce63bc308d8cbe59f0066cd1f1ef0ba8 /source4/scripting/python/samba/tests/getopt.py
parent	7de694974eb234ed45f907196f6415da998b23da (diff)
download	samba-caa134672c053f56360ef602b7f8b9d66b216ad3.tar.gz samba-caa134672c053f56360ef602b7f8b9d66b216ad3.tar.xz samba-caa134672c053f56360ef602b7f8b9d66b216ad3.zip

s3:smbd: make use of SMB_SIGNING_* constants

metze

Diffstat (limited to 'source4/scripting/python/samba/tests/getopt.py')

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/* 
   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 3 of the License, or
   (at your option) any later version.
   
   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

/*******************************************************************
 Setup the word count and byte count for a client smb message.
********************************************************************/

int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
{
	if (zero && (num_words || num_bytes)) {
		memset(buf + smb_size,'\0',num_words*2 + num_bytes);
	}
	SCVAL(buf,smb_wct,num_words);
	SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
	smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
	return (smb_size + num_words*2 + num_bytes);
}

/****************************************************************************
 Change the timeout (in milliseconds).
****************************************************************************/

unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
{
	unsigned int old_timeout = cli->timeout;
	cli->timeout = timeout;
	return old_timeout;
}

/****************************************************************************
 Change the port number used to call on.
****************************************************************************/

void cli_set_port(struct cli_state *cli, int port)
{
	cli->port = port;
}

/****************************************************************************
 convenience routine to find if we negotiated ucs2
****************************************************************************/

bool cli_ucs2(struct cli_state *cli)
{
	return ((cli->capabilities & CAP_UNICODE) != 0);
}


/****************************************************************************
 Read an smb from a fd ignoring all keepalive packets.
 The timeout is in milliseconds

 This is exactly the same as receive_smb except that it never returns
 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 ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
{
	size_t len;

	for(;;) {
		NTSTATUS status;

		set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);

		status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
					cli->timeout, maxlen, &len);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(10,("client_receive_smb failed\n"));
			show_msg(cli->inbuf);

			if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
				set_smb_read_error(&cli->smb_rw_error,
						   SMB_READ_EOF);
				return -1;
			}

			if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
				set_smb_read_error(&cli->smb_rw_error,
						   SMB_READ_TIMEOUT);
				return -1;
			}

			set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
			return -1;
		}

		/*
		 * I don't believe len can be < 0 with NT_STATUS_OK
		 * returned above, but this check doesn't hurt. JRA.
		 */

		if ((ssize_t)len < 0) {
			return len;
		}

		/* Ignore session keepalive packets. */
		if(CVAL(cli->inbuf,0) != SMBkeepalive) {
			break;
		}
	}

	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 = SMB_READ_BAD_DECRYPT;
			return -1;
		}
	}

	show_msg(cli->inbuf);
	return len;
}

static bool cli_state_set_seqnum(struct cli_state *cli, uint16_t mid, uint32_t seqnum)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			c->seqnum = seqnum;
			return true;
		}
	}

	c = talloc_zero(cli, struct cli_state_seqnum);
	if (!c) {
		return false;
	}

	c->mid = mid;
	c->seqnum = seqnum;
	c->persistent = false;
	DLIST_ADD_END(cli->seqnum, c, struct cli_state_seqnum *);

	return true;
}

bool cli_state_seqnum_persistent(struct cli_state *cli,
				 uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			c->persistent = true;
			return true;
		}
	}

	return false;
}

bool cli_state_seqnum_remove(struct cli_state *cli,
			     uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			DLIST_REMOVE(cli->seqnum, c);
			TALLOC_FREE(c);
			return true;
		}
	}

	return false;
}

static uint32_t cli_state_get_seqnum(struct cli_state *cli, uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			uint32_t seqnum = c->seqnum;
			if (!c->persistent) {
				DLIST_REMOVE(cli->seqnum, c);
				TALLOC_FREE(c);
			}
			return seqnum;
		}
	}

	return 0;
}

/****************************************************************************
 Recv an smb.
****************************************************************************/

bool cli_receive_smb(struct cli_state *cli)
{
	ssize_t len;
	uint16_t mid;
	uint32_t seqnum;

	/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
	if (cli->fd == -1)
		return false; 

 again:
	len = client_receive_smb(cli, 0);
	
	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) {
			if (cli->oplock_handler) {
				int fnum = SVAL(cli->inbuf,smb_vwv2);
				unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
				if (!NT_STATUS_IS_OK(cli->oplock_handler(cli, fnum, level))) {
					return false;
				}
			}
			/* try to prevent loops */
			SCVAL(cli->inbuf,smb_com,0xFF);
			goto again;
		}
	}

	/* If the server is not responding, note that now */
	if (len < 0) {
                DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
		close(cli->fd);
		cli->fd = -1;
		return false;
	}

	mid = SVAL(cli->inbuf,smb_mid);
	seqnum = cli_state_get_seqnum(cli, mid);

	if (!cli_check_sign_mac(cli, cli->inbuf, seqnum+1)) {
		/*
		 * 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 = SMB_READ_BAD_SIG;
			return true;
		}

		DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
		cli->smb_rw_error = SMB_READ_BAD_SIG;
		close(cli->fd);
		cli->fd = -1;
		return false;
	};
	return true;
}

/****************************************************************************
 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)
{
	NTSTATUS status;

	set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);

	status = read_fd_with_timeout(
		cli->fd, buffer, len, len, cli->timeout, NULL);
	if (NT_STATUS_IS_OK(status)) {
		return len;
	}

	if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
		set_smb_read_error(&cli->smb_rw_error, SMB_READ_EOF);
		return -1;
	}

	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
		set_smb_read_error(&cli->smb_rw_error, SMB_READ_TIMEOUT);
		return -1;
	}

	set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
	return -1;
}

static ssize_t write_socket(int fd, const char *buf, size_t len)
{
        ssize_t ret=0;

        DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
        ret = write_data(fd,buf,len);

        DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
        if(ret <= 0)
                DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
                        (int)len, fd, strerror(errno) ));

        return(ret);
}

/****************************************************************************
 Send an smb to a fd.
****************************************************************************/

bool cli_send_smb(struct cli_state *cli)
{
	size_t len;
	size_t nwritten=0;
	ssize_t ret;
	char *buf_out = cli->outbuf;
	bool enc_on = cli_encryption_on(cli);
	uint32_t seqnum;

	/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
	if (cli->fd == -1)
		return false;

	cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);

	if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
		DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
			(unsigned int)cli->mid,
			(unsigned int)seqnum));
		return false;
	}

	if (enc_on) {
		NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
						      &buf_out);
		if (!NT_STATUS_IS_OK(status)) {
			close(cli->fd);
			cli->fd = -1;
			cli->smb_rw_error = SMB_WRITE_ERROR;
			DEBUG(0,("Error in encrypting client message. Error %s\n",
				nt_errstr(status) ));
			return false;
		}
	}

	len = smb_len(buf_out) + 4;

	while (nwritten < len) {
		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 = SMB_WRITE_ERROR;
			DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
				(int)len,(int)ret, strerror(errno) ));
			return false;
		}
		nwritten += ret;
	}


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