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wine/dlls/secur32/dispatcher.c
Alexandre Julliard 866240d4fd secur32: Check for lack of fork() support.
2008-12-22 18:04:39 +01:00

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/*
* 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>
#include <stdio.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(ntlm);
SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
char* const argv[])
{
#ifdef HAVE_FORK
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->major = helper->minor = helper->micro = -1;
helper->com_buf = NULL;
helper->com_buf_size = 0;
helper->com_buf_offset = 0;
helper->session_key = NULL;
helper->neg_flags = 0;
helper->crypt.ntlm.a4i = NULL;
helper->crypt.ntlm2.send_a4i = NULL;
helper->crypt.ntlm2.recv_a4i = NULL;
helper->crypt.ntlm2.send_sign_key = NULL;
helper->crypt.ntlm2.send_seal_key = NULL;
helper->crypt.ntlm2.recv_sign_key = NULL;
helper->crypt.ntlm2.recv_seal_key = NULL;
helper->pipe_in = pipe_in[0];
fcntl( pipe_in[0], F_SETFD, 1 );
close(pipe_in[1]);
helper->pipe_out = pipe_out[1];
fcntl( pipe_out[1], F_SETFD, 1 );
close(pipe_out[0]);
}
return SEC_E_OK;
#else
ERR( "no fork support on this platform\n" );
return SEC_E_INTERNAL_ERROR;
#endif
}
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);
helper->helper_pid = 0;
HeapFree(GetProcessHeap(), 0, helper);
}
void check_version(PNegoHelper helper)
{
char temp[80];
char *newline;
int major = 0, minor = 0, micro = 0, ret;
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));
ret = sscanf(temp, "Version %d.%d.%d", &major, &minor, &micro);
if(ret != 3)
{
ERR("Failed to get the helper version.\n");
helper->major = helper->minor = helper->micro = -1;
}
else
{
TRACE("Version recognized: %d.%d.%d\n", major, minor, micro);
helper->major = major;
helper->minor = minor;
helper->micro = micro;
}
}
}
}
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