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 "wine/port.h"
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #ifdef HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <sys/types.h>
  29 #ifdef HAVE_SYS_WAIT_H
  30 #include <sys/wait.h>
  31 #endif
  32 #include <stdlib.h>
  33 #include <fcntl.h>
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "winerror.h"
  37 #include "sspi.h"
  38 #include "secur32_priv.h"
  39 #include "wine/debug.h"
  40
  41 #define INITIAL_BUFFER_SIZE 200
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(ntlm);
  44
  45 SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
  46         char* const argv[])
  47 {
  48 #ifdef HAVE_FORK
  49     int pipe_in[2];
  50     int pipe_out[2];
  51     int i;
  52     PNegoHelper helper;
  53
  54     TRACE("%s ", debugstr_a(prog));
  55     for(i = 0; argv[i] != NULL; ++i)
  56     {
  57         TRACE("%s ", debugstr_a(argv[i]));
  58     }
  59     TRACE("\n");
  60
  61 #ifdef HAVE_PIPE2
  62     if (pipe2( pipe_in, O_CLOEXEC ) < 0 )
  63 #endif
  64     {
  65         if( pipe(pipe_in) < 0 ) return SEC_E_INTERNAL_ERROR;
  66         fcntl( pipe_in[0], F_SETFD, FD_CLOEXEC );
  67         fcntl( pipe_in[1], F_SETFD, FD_CLOEXEC );
  68     }
  69 #ifdef HAVE_PIPE2
  70     if (pipe2( pipe_out, O_CLOEXEC ) < 0 )
  71 #endif
  72     {
  73         if( pipe(pipe_out) < 0 )
  74         {
  75             close(pipe_in[0]);
  76             close(pipe_in[1]);
  77             return SEC_E_INTERNAL_ERROR;
  78         }
  79         fcntl( pipe_out[0], F_SETFD, FD_CLOEXEC );
  80         fcntl( pipe_out[1], F_SETFD, FD_CLOEXEC );
  81     }
  82
  83     if (!(helper = HeapAlloc(GetProcessHeap(),0, sizeof(NegoHelper))))
  84     {
  85         close(pipe_in[0]);
  86         close(pipe_in[1]);
  87         close(pipe_out[0]);
  88         close(pipe_out[1]);
  89         return SEC_E_INSUFFICIENT_MEMORY;
  90     }
  91
  92     helper->helper_pid = fork();
  93
  94     if(helper->helper_pid == -1)
  95     {
  96         close(pipe_in[0]);
  97         close(pipe_in[1]);
  98         close(pipe_out[0]);
  99         close(pipe_out[1]);
 100         HeapFree( GetProcessHeap(), 0, helper );
 101         return SEC_E_INTERNAL_ERROR;
 102     }
 103
 104     if(helper->helper_pid == 0)
 105     {
 106         /* We're in the child now */
 107         dup2(pipe_out[0], 0);
 108         close(pipe_out[0]);
 109         close(pipe_out[1]);
 110
 111         dup2(pipe_in[1], 1);
 112         close(pipe_in[0]);
 113         close(pipe_in[1]);
 114
 115         execvp(prog, argv);
 116
 117         /* Whoops, we shouldn't get here. Big badaboom.*/
 118         write(STDOUT_FILENO, "BH\n", 3);
 119         _exit(1);
 120     }
 121     else
 122     {
 123         *new_helper = helper;
 124         helper->major = helper->minor = helper->micro = -1;
 125         helper->com_buf = NULL;
 126         helper->com_buf_size = 0;
 127         helper->com_buf_offset = 0;
 128         helper->session_key = NULL;
 129         helper->neg_flags = 0;
 130         helper->crypt.ntlm.a4i = NULL;
 131         helper->crypt.ntlm2.send_a4i = NULL;
 132         helper->crypt.ntlm2.recv_a4i = NULL;
 133         helper->crypt.ntlm2.send_sign_key = NULL;
 134         helper->crypt.ntlm2.send_seal_key = NULL;
 135         helper->crypt.ntlm2.recv_sign_key = NULL;
 136         helper->crypt.ntlm2.recv_seal_key = NULL;
 137         helper->pipe_in = pipe_in[0];
 138         close(pipe_in[1]);
 139         helper->pipe_out = pipe_out[1];
 140         close(pipe_out[0]);
 141     }
 142
 143     return SEC_E_OK;
 144 #else
 145     ERR( "no fork support on this platform\n" );
 146     return SEC_E_INTERNAL_ERROR;
 147 #endif
 148 }
 149
 150 static SECURITY_STATUS read_line(PNegoHelper helper, int *offset_len)
 151 {
 152     char *newline;
 153     int read_size;
 154
 155     if(helper->com_buf == NULL)
 156     {
 157         TRACE("Creating a new buffer for the helper\n");
 158         if((helper->com_buf = HeapAlloc(GetProcessHeap(), 0, INITIAL_BUFFER_SIZE)) == NULL)
 159             return SEC_E_INSUFFICIENT_MEMORY;
 160
 161         /* Created a new buffer, size is INITIAL_BUFFER_SIZE, offset is 0 */
 162         helper->com_buf_size = INITIAL_BUFFER_SIZE;
 163         helper->com_buf_offset = 0;
 164     }
 165
 166     do
 167     {
 168         TRACE("offset = %d, size = %d\n", helper->com_buf_offset, helper->com_buf_size);
 169         if(helper->com_buf_offset + INITIAL_BUFFER_SIZE > helper->com_buf_size)
 170         {
 171             /* increment buffer size in INITIAL_BUFFER_SIZE steps */
 172             char *buf = HeapReAlloc(GetProcessHeap(), 0, helper->com_buf,
 173                                     helper->com_buf_size + INITIAL_BUFFER_SIZE);
 174             TRACE("Resizing buffer!\n");
 175             if (!buf) return SEC_E_INSUFFICIENT_MEMORY;
 176             helper->com_buf_size += INITIAL_BUFFER_SIZE;
 177             helper->com_buf = buf;
 178         }
 179         if((read_size = read(helper->pipe_in, helper->com_buf + helper->com_buf_offset,
 180                     helper->com_buf_size - helper->com_buf_offset)) <= 0)
 181         {
 182             return SEC_E_INTERNAL_ERROR;
 183         }
 184
 185         TRACE("read_size = %d, read: %s\n", read_size,
 186                 debugstr_a(helper->com_buf + helper->com_buf_offset));
 187         helper->com_buf_offset += read_size;
 188         newline = memchr(helper->com_buf, '\n', helper->com_buf_offset);
 189     }while(newline == NULL);
 190
 191     /* Now, if there's a newline character, and we read more than that newline,
 192      * we have to store the offset so we can preserve the additional data.*/
 193     if( newline != helper->com_buf + helper->com_buf_offset)
 194     {
 195         TRACE("offset_len is calculated from %p - %p\n",
 196                 (helper->com_buf + helper->com_buf_offset), newline+1);
 197         /* the length of the offset is the number of chars after the newline */
 198         *offset_len = (helper->com_buf + helper->com_buf_offset) - (newline + 1);
 199     }
 200     else
 201     {
 202         *offset_len = 0;
 203     }
 204
 205     *newline = '\0';
 206
 207     return SEC_E_OK;
 208 }
 209
 210 static SECURITY_STATUS preserve_unused(PNegoHelper helper, int offset_len)
 211 {
 212     TRACE("offset_len = %d\n", offset_len);
 213
 214     if(offset_len > 0)
 215     {
 216         memmove(helper->com_buf, helper->com_buf + helper->com_buf_offset,
 217                 offset_len);
 218         helper->com_buf_offset = offset_len;
 219     }
 220     else
 221     {
 222         helper->com_buf_offset = 0;
 223     }
 224
 225     TRACE("helper->com_buf_offset was set to: %d\n", helper->com_buf_offset);
 226     return SEC_E_OK;
 227 }
 228
 229 SECURITY_STATUS run_helper(PNegoHelper helper, char *buffer,
 230         unsigned int max_buflen, int *buflen)
 231 {
 232     int offset_len;
 233     SECURITY_STATUS sec_status = SEC_E_OK;
 234
 235     TRACE("In helper: sending %s\n", debugstr_a(buffer));
 236
 237     /* buffer + '\n' */
 238     write(helper->pipe_out, buffer, lstrlenA(buffer));
 239     write(helper->pipe_out, "\n", 1);
 240
 241     if((sec_status = read_line(helper, &offset_len)) != SEC_E_OK)
 242     {
 243         return sec_status;
 244     }
 245
 246     TRACE("In helper: received %s\n", debugstr_a(helper->com_buf));
 247     *buflen = lstrlenA(helper->com_buf);
 248
 249     if( *buflen > max_buflen)
 250     {
 251         ERR("Buffer size too small(%d given, %d required) dropping data!\n",
 252                 max_buflen, *buflen);
 253         return SEC_E_BUFFER_TOO_SMALL;
 254     }
 255
 256     if( *buflen < 2 )
 257     {
 258         return SEC_E_ILLEGAL_MESSAGE;
 259     }
 260
 261     /* We only get ERR if the input size is too big. On a GENSEC error,
 262      * ntlm_auth will return BH */
 263     if(strncmp(helper->com_buf, "ERR", 3) == 0)
 264     {
 265         return SEC_E_INVALID_TOKEN;
 266     }
 267
 268     memcpy(buffer, helper->com_buf, *buflen+1);
 269
 270     sec_status = preserve_unused(helper, offset_len);
 271
 272     return sec_status;
 273 }
 274
 275 void cleanup_helper(PNegoHelper helper)
 276 {
 277
 278     TRACE("Killing helper %p\n", helper);
 279     if( (helper == NULL) || (helper->helper_pid == 0))
 280         return;
 281
 282     HeapFree(GetProcessHeap(), 0, helper->com_buf);
 283
 284     /* closing stdin will terminate ntlm_auth */
 285     close(helper->pipe_out);
 286     close(helper->pipe_in);
 287
 288     helper->helper_pid = 0;
 289     HeapFree(GetProcessHeap(), 0, helper);
 290 }
 291
 292 void check_version(PNegoHelper helper)
 293 {
 294     char temp[80];
 295     char *newline;
 296     int major = 0, minor = 0, micro = 0, ret;
 297
 298     TRACE("Checking version of helper\n");
 299     if(helper != NULL)
 300     {
 301         int len = read(helper->pipe_in, temp, sizeof(temp)-1);
 302         if (len > 8)
 303         {
 304             if((newline = memchr(temp, '\n', len)) != NULL)
 305                 *newline = '\0';
 306             else
 307                 temp[len] = 0;
 308
 309             TRACE("Exact version is %s\n", debugstr_a(temp));
 310             ret = sscanf(temp, "Version %d.%d.%d", &major, &minor, &micro);
 311             if(ret != 3)
 312             {
 313                 ERR("Failed to get the helper version.\n");
 314                 helper->major = helper->minor = helper->micro = -1;
 315             }
 316             else
 317             {
 318                 TRACE("Version recognized: %d.%d.%d\n", major, minor, micro);
 319                 helper->major = major;
 320                 helper->minor = minor;
 321                 helper->micro = micro;
 322             }
 323         }
 324     }
 325 }