dlls/secur32/dispatcher.c - wine - Git at Google

 /*
  * Copyright 2005, 2006 Kai Blin
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  *
  * A dispatcher to run ntlm_auth for wine's sspi module.
  */

 #include "config.h"
 #include <stdarg.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <sys/types.h>
 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
 #endif
 #include <stdlib.h>
 #include <fcntl.h>
 #include "windef.h"
 #include "winbase.h"
 #include "winerror.h"
 #include "sspi.h"
 #include "secur32_priv.h"
 #include "wine/debug.h"

 #define INITIAL_BUFFER_SIZE 200

 WINE_DEFAULT_DEBUG_CHANNEL(secur32);

 SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
         char* const argv[])
 {
     int pipe_in[2];
     int pipe_out[2];
     int i;
     PNegoHelper helper;

     TRACE("%s ", debugstr_a(prog));
     for(i = 0; argv[i] != NULL; ++i)
     {
         TRACE("%s ", debugstr_a(argv[i]));
     }
     TRACE("\n");

     if( pipe(pipe_in) < 0 )
     {
         return SEC_E_INTERNAL_ERROR;
     }
     if( pipe(pipe_out) < 0 )
     {
         close(pipe_in[0]);
         close(pipe_in[1]);
         return SEC_E_INTERNAL_ERROR;
     }
     if (!(helper = HeapAlloc(GetProcessHeap(),0, sizeof(NegoHelper))))
     {
         close(pipe_in[0]);
         close(pipe_in[1]);
         close(pipe_out[0]);
         close(pipe_out[1]);
         return SEC_E_INSUFFICIENT_MEMORY;
     }

     helper->helper_pid = fork();

     if(helper->helper_pid == -1)
     {
         close(pipe_in[0]);
         close(pipe_in[1]);
         close(pipe_out[0]);
         close(pipe_out[1]);
         HeapFree( GetProcessHeap(), 0, helper );
         return SEC_E_INTERNAL_ERROR;
     }

     if(helper->helper_pid == 0)
     {
         /* We're in the child now */
         close(0);
         close(1);

         dup2(pipe_out[0], 0);
         close(pipe_out[0]);
         close(pipe_out[1]);

         dup2(pipe_in[1], 1);
         close(pipe_in[0]);
         close(pipe_in[1]);

         execvp(prog, argv);

         /* Whoops, we shouldn't get here. Big badaboom.*/
         write(STDOUT_FILENO, "BH\n", 3);
         _exit(1);
     }
     else
     {
         *new_helper = helper;
         helper->version = -1;
         helper->password = NULL;
         helper->com_buf = NULL;
         helper->com_buf_size = 0;
         helper->com_buf_offset = 0;
         helper->session_key = NULL;
         helper->neg_flags = 0;
         helper->pipe_in = pipe_in[0];
         close(pipe_in[1]);
         helper->pipe_out = pipe_out[1];
         close(pipe_out[0]);
     }

     return SEC_E_OK;
 }

 static SECURITY_STATUS read_line(PNegoHelper helper, int *offset_len)
 {
     char *newline;
     int read_size;

     if(helper->com_buf == NULL)
     {
         TRACE("Creating a new buffer for the helper\n");
         if((helper->com_buf = HeapAlloc(GetProcessHeap(), 0, INITIAL_BUFFER_SIZE)) == NULL)
             return SEC_E_INSUFFICIENT_MEMORY;

         /* Created a new buffer, size is INITIAL_BUFFER_SIZE, offset is 0 */
         helper->com_buf_size = INITIAL_BUFFER_SIZE;
         helper->com_buf_offset = 0;
     }

     do
     {
         TRACE("offset = %d, size = %d\n", helper->com_buf_offset, helper->com_buf_size);
         if(helper->com_buf_offset + INITIAL_BUFFER_SIZE > helper->com_buf_size)
         {
             /* increment buffer size in INITIAL_BUFFER_SIZE steps */
             char *buf = HeapReAlloc(GetProcessHeap(), 0, helper->com_buf,
                                     helper->com_buf_size + INITIAL_BUFFER_SIZE);
             TRACE("Resizing buffer!\n");
             if (!buf) return SEC_E_INSUFFICIENT_MEMORY;
             helper->com_buf_size += INITIAL_BUFFER_SIZE;
             helper->com_buf = buf;
         }
         if((read_size = read(helper->pipe_in, helper->com_buf + helper->com_buf_offset,
                     helper->com_buf_size - helper->com_buf_offset)) <= 0)
         {
             return SEC_E_INTERNAL_ERROR;
         }

         TRACE("read_size = %d, read: %s\n", read_size,
                 debugstr_a(helper->com_buf + helper->com_buf_offset));
         helper->com_buf_offset += read_size;
         newline = memchr(helper->com_buf, '\n', helper->com_buf_offset);
     }while(newline == NULL);

     /* Now, if there's a newline character, and we read more than that newline,
      * we have to store the offset so we can preserve the additional data.*/
     if( newline != helper->com_buf + helper->com_buf_offset)
     {
         TRACE("offset_len is calculated from %p - %p\n",
                 (helper->com_buf + helper->com_buf_offset), newline+1);
         /* the length of the offset is the number of chars after the newline */
         *offset_len = (helper->com_buf + helper->com_buf_offset) - (newline + 1);
     }
     else
     {
         *offset_len = 0;
     }

     *newline = '\0';

     return SEC_E_OK;
 }

 static SECURITY_STATUS preserve_unused(PNegoHelper helper, int offset_len)
 {
     TRACE("offset_len = %d\n", offset_len);

     if(offset_len > 0)
     {
         memmove(helper->com_buf, helper->com_buf + helper->com_buf_offset,
                 offset_len);
         helper->com_buf_offset = offset_len;
     }
     else
     {
         helper->com_buf_offset = 0;
     }

     TRACE("helper->com_buf_offset was set to: %d\n", helper->com_buf_offset);
     return SEC_E_OK;
 }

 SECURITY_STATUS run_helper(PNegoHelper helper, char *buffer,
         unsigned int max_buflen, int *buflen)
 {
     int offset_len;
     SECURITY_STATUS sec_status = SEC_E_OK;

     TRACE("In helper: sending %s\n", debugstr_a(buffer));

     /* buffer + '\n' */
     write(helper->pipe_out, buffer, lstrlenA(buffer));
     write(helper->pipe_out, "\n", 1);

     if((sec_status = read_line(helper, &offset_len)) != SEC_E_OK)
     {
         return sec_status;
     }

     TRACE("In helper: received %s\n", debugstr_a(helper->com_buf));
     *buflen = lstrlenA(helper->com_buf);

     if( *buflen > max_buflen)
     {
         ERR("Buffer size too small(%d given, %d required) dropping data!\n",
                 max_buflen, *buflen);
         return SEC_E_BUFFER_TOO_SMALL;
     }

     if( *buflen < 2 )
     {
         return SEC_E_ILLEGAL_MESSAGE;
     }

     /* We only get ERR if the input size is too big. On a GENSEC error,
      * ntlm_auth will return BH */
     if(strncmp(helper->com_buf, "ERR", 3) == 0)
     {
         return SEC_E_INVALID_TOKEN;
     }

     memcpy(buffer, helper->com_buf, *buflen+1);

     sec_status = preserve_unused(helper, offset_len);

     return sec_status;
 }

 void cleanup_helper(PNegoHelper helper)
 {

     TRACE("Killing helper %p\n", helper);
     if( (helper == NULL) || (helper->helper_pid == 0))
         return;

     HeapFree(GetProcessHeap(), 0, helper->com_buf);

     /* closing stdin will terminate ntlm_auth */
     close(helper->pipe_out);
     close(helper->pipe_in);

     waitpid(helper->helper_pid, NULL, 0);

     helper->helper_pid = 0;
     HeapFree(GetProcessHeap(), 0, helper);
 }

 void check_version(PNegoHelper helper)
 {
     char temp[80];
     char *newline;

     TRACE("Checking version of helper\n");
     if(helper != NULL)
     {
         int len = read(helper->pipe_in, temp, sizeof(temp)-1);
         if (len > 8)
         {
             if((newline = memchr(temp, '\n', len)) != NULL)
                 *newline = '\0';
             else
                 temp[len] = 0;

             TRACE("Exact version is %s\n", debugstr_a(temp));
             if(strncmp(temp+8, "4", 1) == 0)
             {
                 helper->version = 4;
             }
             else if(strncmp(temp+8, "3", 1) == 0)
             {
                 helper->version = 3;
             }
             else
             {
                 TRACE("Unknown version!\n");
                 helper->version = -1;
             }
         }
     }
 }
	/*
	* Copyright 2005, 2006 Kai Blin
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* This library 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
	*
	* A dispatcher to run ntlm_auth for wine's sspi module.
	*/

	#include "config.h"
	#include <stdarg.h>
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#include <sys/types.h>
	#ifdef HAVE_SYS_WAIT_H
	#include <sys/wait.h>
	#endif
	#include <stdlib.h>
	#include <fcntl.h>
	#include "windef.h"
	#include "winbase.h"
	#include "winerror.h"
	#include "sspi.h"
	#include "secur32_priv.h"
	#include "wine/debug.h"

	#define INITIAL_BUFFER_SIZE 200

	WINE_DEFAULT_DEBUG_CHANNEL(secur32);

	SECURITY_STATUS fork_helper(PNegoHelper new_helper, const char prog,
	char* const argv[])
	{
	int pipe_in[2];
	int pipe_out[2];
	int i;
	PNegoHelper helper;

	TRACE("%s ", debugstr_a(prog));
	for(i = 0; argv[i] != NULL; ++i)
	{
	TRACE("%s ", debugstr_a(argv[i]));
	}
	TRACE("\n");

	if( pipe(pipe_in) < 0 )
	{
	return SEC_E_INTERNAL_ERROR;
	}
	if( pipe(pipe_out) < 0 )
	{
	close(pipe_in[0]);
	close(pipe_in[1]);
	return SEC_E_INTERNAL_ERROR;
	}
	if (!(helper = HeapAlloc(GetProcessHeap(),0, sizeof(NegoHelper))))
	{
	close(pipe_in[0]);
	close(pipe_in[1]);
	close(pipe_out[0]);
	close(pipe_out[1]);
	return SEC_E_INSUFFICIENT_MEMORY;
	}

	helper->helper_pid = fork();

	if(helper->helper_pid == -1)
	{
	close(pipe_in[0]);
	close(pipe_in[1]);
	close(pipe_out[0]);
	close(pipe_out[1]);
	HeapFree( GetProcessHeap(), 0, helper );
	return SEC_E_INTERNAL_ERROR;
	}

	if(helper->helper_pid == 0)
	{
	/* We're in the child now */
	close(0);
	close(1);

	dup2(pipe_out[0], 0);
	close(pipe_out[0]);
	close(pipe_out[1]);

	dup2(pipe_in[1], 1);
	close(pipe_in[0]);
	close(pipe_in[1]);

	execvp(prog, argv);

	/* Whoops, we shouldn't get here. Big badaboom.*/
	write(STDOUT_FILENO, "BH\n", 3);
	_exit(1);
	}
	else
	{
	*new_helper = helper;
	helper->version = -1;
	helper->password = NULL;
	helper->com_buf = NULL;
	helper->com_buf_size = 0;
	helper->com_buf_offset = 0;
	helper->session_key = NULL;
	helper->neg_flags = 0;
	helper->pipe_in = pipe_in[0];
	close(pipe_in[1]);
	helper->pipe_out = pipe_out[1];
	close(pipe_out[0]);
	}

	return SEC_E_OK;
	}

	static SECURITY_STATUS read_line(PNegoHelper helper, int *offset_len)
	{
	char *newline;
	int read_size;

	if(helper->com_buf == NULL)
	{
	TRACE("Creating a new buffer for the helper\n");
	if((helper->com_buf = HeapAlloc(GetProcessHeap(), 0, INITIAL_BUFFER_SIZE)) == NULL)
	return SEC_E_INSUFFICIENT_MEMORY;

	/* Created a new buffer, size is INITIAL_BUFFER_SIZE, offset is 0 */
	helper->com_buf_size = INITIAL_BUFFER_SIZE;
	helper->com_buf_offset = 0;
	}

	do
	{
	TRACE("offset = %d, size = %d\n", helper->com_buf_offset, helper->com_buf_size);
	if(helper->com_buf_offset + INITIAL_BUFFER_SIZE > helper->com_buf_size)
	{
	/* increment buffer size in INITIAL_BUFFER_SIZE steps */
	char *buf = HeapReAlloc(GetProcessHeap(), 0, helper->com_buf,
	helper->com_buf_size + INITIAL_BUFFER_SIZE);
	TRACE("Resizing buffer!\n");
	if (!buf) return SEC_E_INSUFFICIENT_MEMORY;
	helper->com_buf_size += INITIAL_BUFFER_SIZE;
	helper->com_buf = buf;
	}
	if((read_size = read(helper->pipe_in, helper->com_buf + helper->com_buf_offset,
	helper->com_buf_size - helper->com_buf_offset)) <= 0)
	{
	return SEC_E_INTERNAL_ERROR;
	}

	TRACE("read_size = %d, read: %s\n", read_size,
	debugstr_a(helper->com_buf + helper->com_buf_offset));
	helper->com_buf_offset += read_size;
	newline = memchr(helper->com_buf, '\n', helper->com_buf_offset);
	}while(newline == NULL);

	/* Now, if there's a newline character, and we read more than that newline,
	* we have to store the offset so we can preserve the additional data.*/
	if( newline != helper->com_buf + helper->com_buf_offset)
	{
	TRACE("offset_len is calculated from %p - %p\n",
	(helper->com_buf + helper->com_buf_offset), newline+1);
	/* the length of the offset is the number of chars after the newline */
	*offset_len = (helper->com_buf + helper->com_buf_offset) - (newline + 1);
	}
	else
	{
	*offset_len = 0;
	}

	*newline = '\0';

	return SEC_E_OK;
	}

	static SECURITY_STATUS preserve_unused(PNegoHelper helper, int offset_len)
	{
	TRACE("offset_len = %d\n", offset_len);

	if(offset_len > 0)
	{
	memmove(helper->com_buf, helper->com_buf + helper->com_buf_offset,
	offset_len);
	helper->com_buf_offset = offset_len;
	}
	else
	{
	helper->com_buf_offset = 0;
	}

	TRACE("helper->com_buf_offset was set to: %d\n", helper->com_buf_offset);
	return SEC_E_OK;
	}

	SECURITY_STATUS run_helper(PNegoHelper helper, char *buffer,
	unsigned int max_buflen, int *buflen)
	{
	int offset_len;
	SECURITY_STATUS sec_status = SEC_E_OK;

	TRACE("In helper: sending %s\n", debugstr_a(buffer));

	/* buffer + '\n' */
	write(helper->pipe_out, buffer, lstrlenA(buffer));
	write(helper->pipe_out, "\n", 1);

	if((sec_status = read_line(helper, &offset_len)) != SEC_E_OK)
	{
	return sec_status;
	}

	TRACE("In helper: received %s\n", debugstr_a(helper->com_buf));
	*buflen = lstrlenA(helper->com_buf);

	if( *buflen > max_buflen)
	{
	ERR("Buffer size too small(%d given, %d required) dropping data!\n",
	max_buflen, *buflen);
	return SEC_E_BUFFER_TOO_SMALL;
	}

	if( *buflen < 2 )
	{
	return SEC_E_ILLEGAL_MESSAGE;
	}

	/* We only get ERR if the input size is too big. On a GENSEC error,
	* ntlm_auth will return BH */
	if(strncmp(helper->com_buf, "ERR", 3) == 0)
	{
	return SEC_E_INVALID_TOKEN;
	}

	memcpy(buffer, helper->com_buf, *buflen+1);

	sec_status = preserve_unused(helper, offset_len);

	return sec_status;
	}

	void cleanup_helper(PNegoHelper helper)
	{

	TRACE("Killing helper %p\n", helper);
	if( (helper == NULL) \|\| (helper->helper_pid == 0))
	return;

	HeapFree(GetProcessHeap(), 0, helper->com_buf);

	/* closing stdin will terminate ntlm_auth */
	close(helper->pipe_out);
	close(helper->pipe_in);

	waitpid(helper->helper_pid, NULL, 0);

	helper->helper_pid = 0;
	HeapFree(GetProcessHeap(), 0, helper);
	}

	void check_version(PNegoHelper helper)
	{
	char temp[80];
	char *newline;

	TRACE("Checking version of helper\n");
	if(helper != NULL)
	{
	int len = read(helper->pipe_in, temp, sizeof(temp)-1);
	if (len > 8)
	{
	if((newline = memchr(temp, '\n', len)) != NULL)
	*newline = '\0';
	else
	temp[len] = 0;

	TRACE("Exact version is %s\n", debugstr_a(temp));
	if(strncmp(temp+8, "4", 1) == 0)
	{
	helper->version = 4;
	}
	else if(strncmp(temp+8, "3", 1) == 0)
	{
	helper->version = 3;
	}
	else
	{
	TRACE("Unknown version!\n");
	helper->version = -1;
	}
	}
	}
	}