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 #ifdef HAVE_UNISTD_H
  24 #include <unistd.h>
  25 #endif
  26 #include <sys/types.h>
  27 #ifdef HAVE_SYS_WAIT_H
  28 #include <sys/wait.h>
  29 #endif
  30 #include <stdlib.h>
  31 #include <fcntl.h>
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "winerror.h"
  35 #include "sspi.h"
  36 #include "secur32_priv.h"
  37 #include "wine/debug.h"
  38
  39 #define INITIAL_BUFFER_SIZE 200
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(secur32);
  42
  43 SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
  44         char* const argv[])
  45 {
  46     int pipe_in[2];
  47     int pipe_out[2];
  48     int i;
  49     PNegoHelper helper;
  50
  51     TRACE("%s ", debugstr_a(prog));
  52     for(i = 0; argv[i] != NULL; ++i)
  53     {
  54         TRACE("%s ", debugstr_a(argv[i]));
  55     }
  56     TRACE("\n");
  57
  58     if( pipe(pipe_in) < 0 )
  59     {
  60         return SEC_E_INTERNAL_ERROR;
  61     }
  62     if( pipe(pipe_out) < 0 )
  63     {
  64         close(pipe_in[0]);
  65         close(pipe_in[1]);
  66         return SEC_E_INTERNAL_ERROR;
  67     }
  68     if (!(helper = HeapAlloc(GetProcessHeap(),0, sizeof(NegoHelper))))
  69     {
  70         close(pipe_in[0]);
  71         close(pipe_in[1]);
  72         close(pipe_out[0]);
  73         close(pipe_out[1]);
  74         return SEC_E_INSUFFICIENT_MEMORY;
  75     }
  76
  77     helper->helper_pid = fork();
  78
  79     if(helper->helper_pid == -1)
  80     {
  81         close(pipe_in[0]);
  82         close(pipe_in[1]);
  83         close(pipe_out[0]);
  84         close(pipe_out[1]);
  85         HeapFree( GetProcessHeap(), 0, helper );
  86         return SEC_E_INTERNAL_ERROR;
  87     }
  88
  89     if(helper->helper_pid == 0)
  90     {
  91         /* We're in the child now */
  92         close(0);
  93         close(1);
  94
  95         dup2(pipe_out[0], 0);
  96         close(pipe_out[0]);
  97         close(pipe_out[1]);
  98
  99         dup2(pipe_in[1], 1);
 100         close(pipe_in[0]);
 101         close(pipe_in[1]);
 102
 103         execvp(prog, argv);
 104
 105         /* Whoops, we shouldn't get here. Big badaboom.*/
 106         write(STDOUT_FILENO, "BH\n", 3);
 107         _exit(1);
 108     }
 109     else
 110     {
 111         *new_helper = helper;
 112         helper->version = -1;
 113         helper->password = NULL;
 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     HeapFree(GetProcessHeap(), 0, helper->session_key);
 262
 263     /* closing stdin will terminate ntlm_auth */
 264     close(helper->pipe_out);
 265     close(helper->pipe_in);
 266
 267     waitpid(helper->helper_pid, NULL, 0);
 268
 269     helper->helper_pid = 0;
 270     HeapFree(GetProcessHeap(), 0, helper);
 271 }
 272
 273 void check_version(PNegoHelper helper)
 274 {
 275     char temp[80];
 276     char *newline;
 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             if(strncmp(temp+8, "4", 1) == 0)
 291             {
 292                 helper->version = 4;
 293             }
 294             else if(strncmp(temp+8, "3", 1) == 0)
 295             {
 296                 helper->version = 3;
 297             }
 298             else
 299             {
 300                 TRACE("Unknown version!\n");
 301                 helper->version = -1;
 302             }
 303         }
 304     }
 305 }