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 <errno.h>
  33 #include <stdlib.h>
  34 #include <fcntl.h>
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winerror.h"
  38 #include "sspi.h"
  39 #include "secur32_priv.h"
  40 #include "wine/debug.h"
  41
  42 #define INITIAL_BUFFER_SIZE 200
  43
  44 WINE_DEFAULT_DEBUG_CHANNEL(ntlm);
  45
  46 SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
  47         char* const argv[])
  48 {
  49 #ifdef HAVE_FORK
  50     int pipe_in[2];
  51     int pipe_out[2];
  52     int i;
  53     PNegoHelper helper;
  54
  55     TRACE("%s ", debugstr_a(prog));
  56     for(i = 0; argv[i] != NULL; ++i)
  57     {
  58         TRACE("%s ", debugstr_a(argv[i]));
  59     }
  60     TRACE("\n");
  61
  62 #ifdef HAVE_PIPE2
  63     if (pipe2( pipe_in, O_CLOEXEC ) < 0 )
  64 #endif
  65     {
  66         if( pipe(pipe_in) < 0 ) return SEC_E_INTERNAL_ERROR;
  67         fcntl( pipe_in[0], F_SETFD, FD_CLOEXEC );
  68         fcntl( pipe_in[1], F_SETFD, FD_CLOEXEC );
  69     }
  70 #ifdef HAVE_PIPE2
  71     if (pipe2( pipe_out, O_CLOEXEC ) < 0 )
  72 #endif
  73     {
  74         if( pipe(pipe_out) < 0 )
  75         {
  76             close(pipe_in[0]);
  77             close(pipe_in[1]);
  78             return SEC_E_INTERNAL_ERROR;
  79         }
  80         fcntl( pipe_out[0], F_SETFD, FD_CLOEXEC );
  81         fcntl( pipe_out[1], F_SETFD, FD_CLOEXEC );
  82     }
  83
  84     if (!(helper = heap_alloc( sizeof(NegoHelper) )))
  85     {
  86         close(pipe_in[0]);
  87         close(pipe_in[1]);
  88         close(pipe_out[0]);
  89         close(pipe_out[1]);
  90         return SEC_E_INSUFFICIENT_MEMORY;
  91     }
  92
  93     helper->helper_pid = fork();
  94
  95     if(helper->helper_pid == -1)
  96     {
  97         close(pipe_in[0]);
  98         close(pipe_in[1]);
  99         close(pipe_out[0]);
 100         close(pipe_out[1]);
 101         heap_free( helper );
 102         return SEC_E_INTERNAL_ERROR;
 103     }
 104
 105     if(helper->helper_pid == 0)
 106     {
 107         /* We're in the child now */
 108         dup2(pipe_out[0], 0);
 109         close(pipe_out[0]);
 110         close(pipe_out[1]);
 111
 112         dup2(pipe_in[1], 1);
 113         close(pipe_in[0]);
 114         close(pipe_in[1]);
 115
 116         execvp(prog, argv);
 117
 118         /* Whoops, we shouldn't get here. Big badaboom.*/
 119         write(STDOUT_FILENO, "BH\n", 3);
 120         _exit(1);
 121     }
 122     else
 123     {
 124         *new_helper = helper;
 125         helper->major = helper->minor = helper->micro = -1;
 126         helper->com_buf = NULL;
 127         helper->com_buf_size = 0;
 128         helper->com_buf_offset = 0;
 129         helper->session_key = NULL;
 130         helper->neg_flags = 0;
 131         helper->crypt.ntlm.a4i = NULL;
 132         helper->crypt.ntlm2.send_a4i = NULL;
 133         helper->crypt.ntlm2.recv_a4i = NULL;
 134         helper->crypt.ntlm2.send_sign_key = NULL;
 135         helper->crypt.ntlm2.send_seal_key = NULL;
 136         helper->crypt.ntlm2.recv_sign_key = NULL;
 137         helper->crypt.ntlm2.recv_seal_key = NULL;
 138         helper->pipe_in = pipe_in[0];
 139         close(pipe_in[1]);
 140         helper->pipe_out = pipe_out[1];
 141         close(pipe_out[0]);
 142     }
 143
 144     return SEC_E_OK;
 145 #else
 146     ERR( "no fork support on this platform\n" );
 147     return SEC_E_INTERNAL_ERROR;
 148 #endif
 149 }
 150
 151 static SECURITY_STATUS read_line(PNegoHelper helper, int *offset_len)
 152 {
 153     char *newline;
 154     int read_size;
 155
 156     if(helper->com_buf == NULL)
 157     {
 158         TRACE("Creating a new buffer for the helper\n");
 159         if (!(helper->com_buf = heap_alloc(INITIAL_BUFFER_SIZE)))
 160             return SEC_E_INSUFFICIENT_MEMORY;
 161
 162         /* Created a new buffer, size is INITIAL_BUFFER_SIZE, offset is 0 */
 163         helper->com_buf_size = INITIAL_BUFFER_SIZE;
 164         helper->com_buf_offset = 0;
 165     }
 166
 167     do
 168     {
 169         TRACE("offset = %d, size = %d\n", helper->com_buf_offset, helper->com_buf_size);
 170         if(helper->com_buf_offset + INITIAL_BUFFER_SIZE > helper->com_buf_size)
 171         {
 172             /* increment buffer size in INITIAL_BUFFER_SIZE steps */
 173             char *buf = heap_realloc(helper->com_buf, 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)
 280         return;
 281
 282     heap_free(helper->com_buf);
 283     heap_free(helper->session_key);
 284
 285     /* closing stdin will terminate ntlm_auth */
 286     close(helper->pipe_out);
 287     close(helper->pipe_in);
 288
 289 #ifdef HAVE_FORK
 290     if (helper->helper_pid > 0) /* reap child */
 291     {
 292         pid_t wret;
 293         do {
 294             wret = waitpid(helper->helper_pid, NULL, 0);
 295         } while (wret < 0 && errno == EINTR);
 296     }
 297 #endif
 298
 299     heap_free(helper);
 300 }
 301
 302 void check_version(PNegoHelper helper)
 303 {
 304     char temp[80];
 305     char *newline;
 306     int major = 0, minor = 0, micro = 0, ret;
 307
 308     TRACE("Checking version of helper\n");
 309     if(helper != NULL)
 310     {
 311         int len = read(helper->pipe_in, temp, sizeof(temp)-1);
 312         if (len > 8)
 313         {
 314             if((newline = memchr(temp, '\n', len)) != NULL)
 315                 *newline = '\0';
 316             else
 317                 temp[len] = 0;
 318
 319             TRACE("Exact version is %s\n", debugstr_a(temp));
 320             ret = sscanf(temp, "Version %d.%d.%d", &major, &minor, &micro);
 321             if(ret != 3)
 322             {
 323                 ERR("Failed to get the helper version.\n");
 324                 helper->major = helper->minor = helper->micro = -1;
 325             }
 326             else
 327             {
 328                 TRACE("Version recognized: %d.%d.%d\n", major, minor, micro);
 329                 helper->major = major;
 330                 helper->minor = minor;
 331                 helper->micro = micro;
 332             }
 333         }
 334     }
 335 }