source3/libsmb/clidgram.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client dgram calls
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Richard Sharpe 2001
   6    Copyright (C) John Terpstra 2001
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "librpc/gen_ndr/messaging.h"
  24
  25 /*
  26  * cli_send_mailslot, send a mailslot for client code ...
  27  */
  28
  29 static bool cli_send_mailslot(struct messaging_context *msg_ctx,
  30                        bool unique, const char *mailslot,
  31                        uint16 priority,
  32                        char *buf, int len,
  33                        const char *srcname, int src_type,
  34                        const char *dstname, int dest_type,
  35                        const struct sockaddr_storage *dest_ss)
  36 {
  37         struct packet_struct p;
  38         struct dgram_packet *dgram = &p.packet.dgram;
  39         char *ptr, *p2;
  40         char tmp[4];
  41         pid_t nmbd_pid;
  42         char addr[INET6_ADDRSTRLEN];
  43
  44         if ((nmbd_pid = pidfile_pid("nmbd")) == 0) {
  45                 DEBUG(3, ("No nmbd found\n"));
  46                 return False;
  47         }
  48
  49         if (dest_ss->ss_family != AF_INET) {
  50                 DEBUG(3, ("cli_send_mailslot: can't send to IPv6 address.\n"));
  51                 return false;
  52         }
  53
  54         memset((char *)&p, '\0', sizeof(p));
  55
  56         /*
  57          * Next, build the DGRAM ...
  58          */
  59
  60         /* DIRECT GROUP or UNIQUE datagram. */
  61         dgram->header.msg_type = unique ? 0x10 : 0x11;
  62         dgram->header.flags.node_type = M_NODE;
  63         dgram->header.flags.first = True;
  64         dgram->header.flags.more = False;
  65         dgram->header.dgm_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) +
  66                 ((unsigned)sys_getpid()%(unsigned)100);
  67         /* source ip is filled by nmbd */
  68         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  69         dgram->header.packet_offset = 0;
  70
  71         make_nmb_name(&dgram->source_name,srcname,src_type);
  72         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  73
  74         ptr = &dgram->data[0];
  75
  76         /* Setup the smb part. */
  77         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  78         memcpy(tmp,ptr,4);
  79
  80         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  81                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  82                 return False;
  83         }
  84
  85         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  86         memcpy(ptr,tmp,4);
  87
  88         SCVAL(ptr,smb_com,SMBtrans);
  89         SSVAL(ptr,smb_vwv1,len);
  90         SSVAL(ptr,smb_vwv11,len);
  91         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  92         SSVAL(ptr,smb_vwv13,3);
  93         SSVAL(ptr,smb_vwv14,1);
  94         SSVAL(ptr,smb_vwv15,priority);
  95         SSVAL(ptr,smb_vwv16,2);
  96         p2 = smb_buf(ptr);
  97         fstrcpy(p2,mailslot);
  98         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  99         if (!p2) {
 100                 return False;
 101         }
 102
 103         memcpy(p2,buf,len);
 104         p2 += len;
 105
 106         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 107
 108         p.packet_type = DGRAM_PACKET;
 109         p.ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 110         p.timestamp = time(NULL);
 111
 112         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 113                  mailslot, nmb_namestr(&dgram->source_name)));
 114         print_sockaddr(addr, sizeof(addr), dest_ss);
 115
 116         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 117
 118         return NT_STATUS_IS_OK(messaging_send_buf(msg_ctx,
 119                                                   pid_to_procid(nmbd_pid),
 120                                                   MSG_SEND_PACKET,
 121                                                   (uint8 *)&p, sizeof(p)));
 122 }
 123
 124 static const char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 125 {
 126         return talloc_asprintf(mem_ctx, "%s%X",
 127                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 128 }
 129
 130 bool send_getdc_request(TALLOC_CTX *mem_ctx,
 131                         struct messaging_context *msg_ctx,
 132                         struct sockaddr_storage *dc_ss,
 133                         const char *domain_name,
 134                         const DOM_SID *sid,
 135                         uint32_t nt_version)
 136 {
 137         struct in_addr dc_ip;
 138         const char *my_acct_name = NULL;
 139         const char *my_mailslot = NULL;
 140         struct nbt_netlogon_packet packet;
 141         struct NETLOGON_SAM_LOGON_REQUEST *s;
 142         enum ndr_err_code ndr_err;
 143         DATA_BLOB blob;
 144         struct dom_sid my_sid;
 145
 146         ZERO_STRUCT(packet);
 147         ZERO_STRUCT(my_sid);
 148
 149         if (dc_ss->ss_family != AF_INET) {
 150                 return false;
 151         }
 152
 153         if (sid) {
 154                 my_sid = *sid;
 155         }
 156
 157         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 158         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 159         if (!my_mailslot) {
 160                 return false;
 161         }
 162
 163         my_acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname());
 164         if (!my_acct_name) {
 165                 return false;
 166         }
 167
 168         packet.command  = LOGON_SAM_LOGON_REQUEST;
 169         s               = &packet.req.logon;
 170
 171         s->request_count        = 0;
 172         s->computer_name        = global_myname();
 173         s->user_name            = my_acct_name;
 174         s->mailslot_name        = my_mailslot;
 175         s->acct_control         = ACB_WSTRUST;
 176         s->sid                  = my_sid;
 177         s->nt_version           = nt_version;
 178         s->lmnt_token           = 0xffff;
 179         s->lm20_token           = 0xffff;
 180
 181         if (DEBUGLEVEL >= 10) {
 182                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 183         }
 184
 185         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, NULL, &packet,
 186                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 187         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 188                 return false;
 189         }
 190
 191         return cli_send_mailslot(msg_ctx,
 192                                  false, NBT_MAILSLOT_NTLOGON, 0,
 193                                  (char *)blob.data, blob.length,
 194                                  global_myname(), 0, domain_name, 0x1c,
 195                                  dc_ss);
 196 }
 197
 198 bool receive_getdc_response(TALLOC_CTX *mem_ctx,
 199                             struct sockaddr_storage *dc_ss,
 200                             const char *domain_name,
 201                             uint32_t *nt_version,
 202                             const char **dc_name,
 203                             struct netlogon_samlogon_response **_r)
 204 {
 205         struct packet_struct *packet;
 206         const char *my_mailslot = NULL;
 207         struct in_addr dc_ip;
 208         DATA_BLOB blob;
 209         struct netlogon_samlogon_response r;
 210         union dgram_message_body p;
 211         enum ndr_err_code ndr_err;
 212         NTSTATUS status;
 213
 214         const char *returned_dc = NULL;
 215         const char *returned_domain = NULL;
 216
 217         if (dc_ss->ss_family != AF_INET) {
 218                 return false;
 219         }
 220
 221         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 222
 223         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 224         if (!my_mailslot) {
 225                 return false;
 226         }
 227
 228         packet = receive_unexpected(DGRAM_PACKET, 0, my_mailslot);
 229
 230         if (packet == NULL) {
 231                 DEBUG(5, ("Did not receive packet for %s\n", my_mailslot));
 232                 return False;
 233         }
 234
 235         DEBUG(5, ("Received packet for %s\n", my_mailslot));
 236
 237         blob = data_blob_const(packet->packet.dgram.data,
 238                                packet->packet.dgram.datasize);
 239
 240         if (blob.length < 4) {
 241                 DEBUG(0,("invalid length: %d\n", (int)blob.length));
 242                 return false;
 243         }
 244
 245         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 246                 DEBUG(0,("invalid packet\n"));
 247                 return false;
 248         }
 249
 250         blob.data += 4;
 251         blob.length -= 4;
 252
 253         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, NULL, &p, DGRAM_SMB,
 254                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 255         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 256                 DEBUG(0,("failed to parse packet\n"));
 257                 return false;
 258         }
 259
 260         if (p.smb.smb_command != SMB_TRANSACTION) {
 261                 DEBUG(0,("invalid smb_command: %d\n", p.smb.smb_command));
 262                 return false;
 263         }
 264
 265         if (DEBUGLEVEL >= 10) {
 266                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 267         }
 268
 269         blob = p.smb.body.trans.data;
 270
 271         ZERO_STRUCT(r);
 272
 273         status = pull_netlogon_samlogon_response(&blob, mem_ctx, NULL, &r);
 274         if (!NT_STATUS_IS_OK(status)) {
 275                 return false;
 276         }
 277
 278         map_netlogon_samlogon_response(&r);
 279
 280         /* do we still need this ? */
 281         *nt_version = r.ntver;
 282
 283         returned_domain = r.data.nt5_ex.domain_name;
 284         returned_dc = r.data.nt5_ex.pdc_name;
 285
 286         if (!strequal(returned_domain, domain_name)) {
 287                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 288                           domain_name, returned_domain));
 289                 return false;
 290         }
 291
 292         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 293         if (!*dc_name) {
 294                 return false;
 295         }
 296
 297         if (**dc_name == '\\')  *dc_name += 1;
 298         if (**dc_name == '\\')  *dc_name += 1;
 299
 300         if (_r) {
 301                 *_r = (struct netlogon_samlogon_response *)talloc_memdup(
 302                         mem_ctx, &r, sizeof(struct netlogon_samlogon_response));
 303                 if (!*_r) {
 304                         return false;
 305                 }
 306         }
 307
 308         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 309                    *dc_name, returned_domain));
 310
 311         return True;
 312 }