dlls/secur32/dispatcher.c

   1 /*
   2  * Copyright 2005, 2006 Kai Blin
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  *
  18  * A dispatcher to run ntlm_auth for wine's sspi module.
  19  */
  20
  21 #include "config.h"
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #ifdef HAVE_UNISTD_H
  25 #include <unistd.h>
  26 #endif
  27 #include <sys/types.h>
  28 #ifdef HAVE_SYS_WAIT_H
  29 #include <sys/wait.h>
  30 #endif
  31 #include <stdlib.h>
  32 #include <fcntl.h>
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "winerror.h"
  36 #include "sspi.h"
  37 #include "secur32_priv.h"
  38 #include "wine/debug.h"
  39
  40 #define INITIAL_BUFFER_SIZE 200
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(ntlm);
  43
  44 SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
  45         char* const argv[])
  46 {
  47     int pipe_in[2];
  48     int pipe_out[2];
  49     int i;
  50     PNegoHelper helper;
  51
  52     TRACE("%s ", debugstr_a(prog));
  53     for(i = 0; argv[i] != NULL; ++i)
  54     {
  55         TRACE("%s ", debugstr_a(argv[i]));
  56     }
  57     TRACE("\n");
  58
  59     if( pipe(pipe_in) < 0 )
  60     {
  61         return SEC_E_INTERNAL_ERROR;
  62     }
  63     if( pipe(pipe_out) < 0 )
  64     {
  65         close(pipe_in[0]);
  66         close(pipe_in[1]);
  67         return SEC_E_INTERNAL_ERROR;
  68     }
  69     if (!(helper = HeapAlloc(GetProcessHeap(),0, sizeof(NegoHelper))))
  70     {
  71         close(pipe_in[0]);
  72         close(pipe_in[1]);
  73         close(pipe_out[0]);
  74         close(pipe_out[1]);
  75         return SEC_E_INSUFFICIENT_MEMORY;
  76     }
  77
  78     helper->helper_pid = fork();
  79
  80     if(helper->helper_pid == -1)
  81     {
  82         close(pipe_in[0]);
  83         close(pipe_in[1]);
  84         close(pipe_out[0]);
  85         close(pipe_out[1]);
  86         HeapFree( GetProcessHeap(), 0, helper );
  87         return SEC_E_INTERNAL_ERROR;
  88     }
  89
  90     if(helper->helper_pid == 0)
  91     {
  92         /* We're in the child now */
  93         close(0);
  94         close(1);
  95
  96         dup2(pipe_out[0], 0);
  97         close(pipe_out[0]);
  98         close(pipe_out[1]);
  99
 100         dup2(pipe_in[1], 1);
 101         close(pipe_in[0]);
 102         close(pipe_in[1]);
 103
 104         execvp(prog, argv);
 105
 106         /* Whoops, we shouldn't get here. Big badaboom.*/
 107         write(STDOUT_FILENO, "BH\n", 3);
 108         _exit(1);
 109     }
 110     else
 111     {
 112         *new_helper = helper;
 113         helper->major = helper->minor = helper->micro = -1;
 114         helper->com_buf = NULL;
 115         helper->com_buf_size = 0;
 116         helper->com_buf_offset = 0;
 117         helper->session_key = NULL;
 118         helper->neg_flags = 0;
 119         helper->pipe_in = pipe_in[0];
 120         close(pipe_in[1]);
 121         helper->pipe_out = pipe_out[1];
 122         close(pipe_out[0]);
 123     }
 124
 125     return SEC_E_OK;
 126 }
 127
 128 static SECURITY_STATUS read_line(PNegoHelper helper, int *offset_len)
 129 {
 130     char *newline;
 131     int read_size;
 132
 133     if(helper->com_buf == NULL)
 134     {
 135         TRACE("Creating a new buffer for the helper\n");
 136         if((helper->com_buf = HeapAlloc(GetProcessHeap(), 0, INITIAL_BUFFER_SIZE)) == NULL)
 137             return SEC_E_INSUFFICIENT_MEMORY;
 138
 139         /* Created a new buffer, size is INITIAL_BUFFER_SIZE, offset is 0 */
 140         helper->com_buf_size = INITIAL_BUFFER_SIZE;
 141         helper->com_buf_offset = 0;
 142     }
 143
 144     do
 145     {
 146         TRACE("offset = %d, size = %d\n", helper->com_buf_offset, helper->com_buf_size);
 147         if(helper->com_buf_offset + INITIAL_BUFFER_SIZE > helper->com_buf_size)
 148         {
 149             /* increment buffer size in INITIAL_BUFFER_SIZE steps */
 150             char *buf = HeapReAlloc(GetProcessHeap(), 0, helper->com_buf,
 151                                     helper->com_buf_size + INITIAL_BUFFER_SIZE);
 152             TRACE("Resizing buffer!\n");
 153             if (!buf) return SEC_E_INSUFFICIENT_MEMORY;
 154             helper->com_buf_size += INITIAL_BUFFER_SIZE;
 155             helper->com_buf = buf;
 156         }
 157         if((read_size = read(helper->pipe_in, helper->com_buf + helper->com_buf_offset,
 158                     helper->com_buf_size - helper->com_buf_offset)) <= 0)
 159         {
 160             return SEC_E_INTERNAL_ERROR;
 161         }
 162
 163         TRACE("read_size = %d, read: %s\n", read_size,
 164                 debugstr_a(helper->com_buf + helper->com_buf_offset));
 165         helper->com_buf_offset += read_size;
 166         newline = memchr(helper->com_buf, '\n', helper->com_buf_offset);
 167     }while(newline == NULL);
 168
 169     /* Now, if there's a newline character, and we read more than that newline,
 170      * we have to store the offset so we can preserve the additional data.*/
 171     if( newline != helper->com_buf + helper->com_buf_offset)
 172     {
 173         TRACE("offset_len is calculated from %p - %p\n",
 174                 (helper->com_buf + helper->com_buf_offset), newline+1);
 175         /* the length of the offset is the number of chars after the newline */
 176         *offset_len = (helper->com_buf + helper->com_buf_offset) - (newline + 1);
 177     }
 178     else
 179     {
 180         *offset_len = 0;
 181     }
 182
 183     *newline = '\0';
 184
 185     return SEC_E_OK;
 186 }
 187
 188 static SECURITY_STATUS preserve_unused(PNegoHelper helper, int offset_len)
 189 {
 190     TRACE("offset_len = %d\n", offset_len);
 191
 192     if(offset_len > 0)
 193     {
 194         memmove(helper->com_buf, helper->com_buf + helper->com_buf_offset,
 195                 offset_len);
 196         helper->com_buf_offset = offset_len;
 197     }
 198     else
 199     {
 200         helper->com_buf_offset = 0;
 201     }
 202
 203     TRACE("helper->com_buf_offset was set to: %d\n", helper->com_buf_offset);
 204     return SEC_E_OK;
 205 }
 206
 207 SECURITY_STATUS run_helper(PNegoHelper helper, char *buffer,
 208         unsigned int max_buflen, int *buflen)
 209 {
 210     int offset_len;
 211     SECURITY_STATUS sec_status = SEC_E_OK;
 212
 213     TRACE("In helper: sending %s\n", debugstr_a(buffer));
 214
 215     /* buffer + '\n' */
 216     write(helper->pipe_out, buffer, lstrlenA(buffer));
 217     write(helper->pipe_out, "\n", 1);
 218
 219     if((sec_status = read_line(helper, &offset_len)) != SEC_E_OK)
 220     {
 221         return sec_status;
 222     }
 223
 224     TRACE("In helper: received %s\n", debugstr_a(helper->com_buf));
 225     *buflen = lstrlenA(helper->com_buf);
 226
 227     if( *buflen > max_buflen)
 228     {
 229         ERR("Buffer size too small(%d given, %d required) dropping data!\n",
 230                 max_buflen, *buflen);
 231         return SEC_E_BUFFER_TOO_SMALL;
 232     }
 233
 234     if( *buflen < 2 )
 235     {
 236         return SEC_E_ILLEGAL_MESSAGE;
 237     }
 238
 239     /* We only get ERR if the input size is too big. On a GENSEC error,
 240      * ntlm_auth will return BH */
 241     if(strncmp(helper->com_buf, "ERR", 3) == 0)
 242     {
 243         return SEC_E_INVALID_TOKEN;
 244     }
 245
 246     memcpy(buffer, helper->com_buf, *buflen+1);
 247
 248     sec_status = preserve_unused(helper, offset_len);
 249
 250     return sec_status;
 251 }
 252
 253 void cleanup_helper(PNegoHelper helper)
 254 {
 255
 256     TRACE("Killing helper %p\n", helper);
 257     if( (helper == NULL) || (helper->helper_pid == 0))
 258         return;
 259
 260     HeapFree(GetProcessHeap(), 0, helper->com_buf);
 261
 262     /* closing stdin will terminate ntlm_auth */
 263     close(helper->pipe_out);
 264     close(helper->pipe_in);
 265
 266     waitpid(helper->helper_pid, NULL, 0);
 267
 268     helper->helper_pid = 0;
 269     HeapFree(GetProcessHeap(), 0, helper);
 270 }
 271
 272 void check_version(PNegoHelper helper)
 273 {
 274     char temp[80];
 275     char *newline;
 276     int major = 0, minor = 0, micro = 0, ret;
 277
 278     TRACE("Checking version of helper\n");
 279     if(helper != NULL)
 280     {
 281         int len = read(helper->pipe_in, temp, sizeof(temp)-1);
 282         if (len > 8)
 283         {
 284             if((newline = memchr(temp, '\n', len)) != NULL)
 285                 *newline = '\0';
 286             else
 287                 temp[len] = 0;
 288
 289             TRACE("Exact version is %s\n", debugstr_a(temp));
 290             ret = sscanf(temp, "Version %d.%d.%d", &major, &minor, &micro);
 291             if(ret != 3)
 292             {
 293                 ERR("Failed to get the helper version.\n");
 294                 helper->major = helper->minor = helper->micro = -1;
 295             }
 296             else
 297             {
 298                 TRACE("Version recognized: %d.%d.%d\n", major, minor, micro);
 299                 helper->major = major;
 300                 helper->minor = minor;
 301                 helper->micro = micro;
 302             }
 303         }
 304     }
 305 }