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 #include "libsmb/clidgram.h"
  25
  26 /*
  27  * cli_send_mailslot, send a mailslot for client code ...
  28  */
  29
  30 static bool cli_send_mailslot(struct messaging_context *msg_ctx,
  31                        bool unique, const char *mailslot,
  32                        uint16 priority,
  33                        char *buf, int len,
  34                        const char *srcname, int src_type,
  35                        const char *dstname, int dest_type,
  36                        const struct sockaddr_storage *dest_ss)
  37 {
  38         struct packet_struct p;
  39         struct dgram_packet *dgram = &p.packet.dgram;
  40         char *ptr, *p2;
  41         char tmp[4];
  42         pid_t nmbd_pid;
  43         char addr[INET6_ADDRSTRLEN];
  44
  45         if ((nmbd_pid = pidfile_pid("nmbd")) == 0) {
  46                 DEBUG(3, ("No nmbd found\n"));
  47                 return False;
  48         }
  49
  50         if (dest_ss->ss_family != AF_INET) {
  51                 DEBUG(3, ("cli_send_mailslot: can't send to IPv6 address.\n"));
  52                 return false;
  53         }
  54
  55         memset((char *)&p, '\0', sizeof(p));
  56
  57         /*
  58          * Next, build the DGRAM ...
  59          */
  60
  61         /* DIRECT GROUP or UNIQUE datagram. */
  62         dgram->header.msg_type = unique ? 0x10 : 0x11;
  63         dgram->header.flags.node_type = M_NODE;
  64         dgram->header.flags.first = True;
  65         dgram->header.flags.more = False;
  66         dgram->header.dgm_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) +
  67                 ((unsigned)sys_getpid()%(unsigned)100);
  68         /* source ip is filled by nmbd */
  69         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  70         dgram->header.packet_offset = 0;
  71
  72         make_nmb_name(&dgram->source_name,srcname,src_type);
  73         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  74
  75         ptr = &dgram->data[0];
  76
  77         /* Setup the smb part. */
  78         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  79         memcpy(tmp,ptr,4);
  80
  81         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  82                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  83                 return False;
  84         }
  85
  86         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  87         memcpy(ptr,tmp,4);
  88
  89         SCVAL(ptr,smb_com,SMBtrans);
  90         SSVAL(ptr,smb_vwv1,len);
  91         SSVAL(ptr,smb_vwv11,len);
  92         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  93         SSVAL(ptr,smb_vwv13,3);
  94         SSVAL(ptr,smb_vwv14,1);
  95         SSVAL(ptr,smb_vwv15,priority);
  96         SSVAL(ptr,smb_vwv16,2);
  97         p2 = smb_buf(ptr);
  98         fstrcpy(p2,mailslot);
  99         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
 100         if (!p2) {
 101                 return False;
 102         }
 103
 104         memcpy(p2,buf,len);
 105         p2 += len;
 106
 107         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 108
 109         p.packet_type = DGRAM_PACKET;
 110         p.ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 111         p.timestamp = time(NULL);
 112
 113         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 114                  mailslot, nmb_namestr(&dgram->source_name)));
 115         print_sockaddr(addr, sizeof(addr), dest_ss);
 116
 117         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 118
 119         return NT_STATUS_IS_OK(messaging_send_buf(msg_ctx,
 120                                                   pid_to_procid(nmbd_pid),
 121                                                   MSG_SEND_PACKET,
 122                                                   (uint8 *)&p, sizeof(p)));
 123 }
 124
 125 static const char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 126 {
 127         return talloc_asprintf(mem_ctx, "%s%X",
 128                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 129 }
 130
 131 bool send_getdc_request(TALLOC_CTX *mem_ctx,
 132                         struct messaging_context *msg_ctx,
 133                         struct sockaddr_storage *dc_ss,
 134                         const char *domain_name,
 135                         const struct dom_sid *sid,
 136                         uint32_t nt_version)
 137 {
 138         struct in_addr dc_ip;
 139         const char *my_acct_name = NULL;
 140         const char *my_mailslot = NULL;
 141         struct nbt_netlogon_packet packet;
 142         struct NETLOGON_SAM_LOGON_REQUEST *s;
 143         enum ndr_err_code ndr_err;
 144         DATA_BLOB blob;
 145         struct dom_sid my_sid;
 146
 147         ZERO_STRUCT(packet);
 148         ZERO_STRUCT(my_sid);
 149
 150         if (dc_ss->ss_family != AF_INET) {
 151                 return false;
 152         }
 153
 154         if (sid) {
 155                 my_sid = *sid;
 156         }
 157
 158         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 159         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 160         if (!my_mailslot) {
 161                 return false;
 162         }
 163
 164         my_acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname());
 165         if (!my_acct_name) {
 166                 return false;
 167         }
 168
 169         packet.command  = LOGON_SAM_LOGON_REQUEST;
 170         s               = &packet.req.logon;
 171
 172         s->request_count        = 0;
 173         s->computer_name        = global_myname();
 174         s->user_name            = my_acct_name;
 175         s->mailslot_name        = my_mailslot;
 176         s->acct_control         = ACB_WSTRUST;
 177         s->sid                  = my_sid;
 178         s->nt_version           = nt_version;
 179         s->lmnt_token           = 0xffff;
 180         s->lm20_token           = 0xffff;
 181
 182         if (DEBUGLEVEL >= 10) {
 183                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 184         }
 185
 186         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, &packet,
 187                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 188         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 189                 return false;
 190         }
 191
 192         return cli_send_mailslot(msg_ctx,
 193                                  false, NBT_MAILSLOT_NTLOGON, 0,
 194                                  (char *)blob.data, blob.length,
 195                                  global_myname(), 0, domain_name, 0x1c,
 196                                  dc_ss);
 197 }
 198
 199 bool receive_getdc_response(TALLOC_CTX *mem_ctx,
 200                             struct sockaddr_storage *dc_ss,
 201                             const char *domain_name,
 202                             uint32_t *nt_version,
 203                             const char **dc_name,
 204                             struct netlogon_samlogon_response **_r)
 205 {
 206         struct packet_struct *packet;
 207         const char *my_mailslot = NULL;
 208         struct in_addr dc_ip;
 209         DATA_BLOB blob;
 210         struct netlogon_samlogon_response r;
 211         union dgram_message_body p;
 212         enum ndr_err_code ndr_err;
 213         NTSTATUS status;
 214
 215         const char *returned_dc = NULL;
 216         const char *returned_domain = NULL;
 217
 218         if (dc_ss->ss_family != AF_INET) {
 219                 return false;
 220         }
 221
 222         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 223
 224         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 225         if (!my_mailslot) {
 226                 return false;
 227         }
 228
 229         packet = receive_unexpected(DGRAM_PACKET, 0, my_mailslot);
 230
 231         if (packet == NULL) {
 232                 DEBUG(5, ("Did not receive packet for %s\n", my_mailslot));
 233                 return False;
 234         }
 235
 236         DEBUG(5, ("Received packet for %s\n", my_mailslot));
 237
 238         blob = data_blob_const(packet->packet.dgram.data,
 239                                packet->packet.dgram.datasize);
 240
 241         if (blob.length < 4) {
 242                 DEBUG(0,("invalid length: %d\n", (int)blob.length));
 243                 return false;
 244         }
 245
 246         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 247                 DEBUG(0,("invalid packet\n"));
 248                 return false;
 249         }
 250
 251         blob.data += 4;
 252         blob.length -= 4;
 253
 254         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 255                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 256         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 257                 DEBUG(0,("failed to parse packet\n"));
 258                 return false;
 259         }
 260
 261         if (p.smb.smb_command != SMB_TRANSACTION) {
 262                 DEBUG(0,("invalid smb_command: %d\n", p.smb.smb_command));
 263                 return false;
 264         }
 265
 266         if (DEBUGLEVEL >= 10) {
 267                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 268         }
 269
 270         blob = p.smb.body.trans.data;
 271
 272         ZERO_STRUCT(r);
 273
 274         status = pull_netlogon_samlogon_response(&blob, mem_ctx, &r);
 275         if (!NT_STATUS_IS_OK(status)) {
 276                 return false;
 277         }
 278
 279         map_netlogon_samlogon_response(&r);
 280
 281         /* do we still need this ? */
 282         *nt_version = r.ntver;
 283
 284         returned_domain = r.data.nt5_ex.domain_name;
 285         returned_dc = r.data.nt5_ex.pdc_name;
 286
 287         if (!strequal(returned_domain, domain_name)) {
 288                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 289                           domain_name, returned_domain));
 290                 return false;
 291         }
 292
 293         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 294         if (!*dc_name) {
 295                 return false;
 296         }
 297
 298         if (**dc_name == '\\')  *dc_name += 1;
 299         if (**dc_name == '\\')  *dc_name += 1;
 300
 301         if (_r) {
 302                 *_r = (struct netlogon_samlogon_response *)talloc_memdup(
 303                         mem_ctx, &r, sizeof(struct netlogon_samlogon_response));
 304                 if (!*_r) {
 305                         return false;
 306                 }
 307         }
 308
 309         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 310                    *dc_name, returned_domain));
 311
 312         return True;
 313 }