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_prep_mailslot(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                        int dgm_id,
  37                        struct packet_struct *p)
  38 {
  39         struct dgram_packet *dgram = &p->packet.dgram;
  40         char *ptr, *p2;
  41         char tmp[4];
  42         char addr[INET6_ADDRSTRLEN];
  43
  44         ZERO_STRUCTP(p);
  45
  46         /*
  47          * Next, build the DGRAM ...
  48          */
  49
  50         /* DIRECT GROUP or UNIQUE datagram. */
  51         dgram->header.msg_type = unique ? 0x10 : 0x11;
  52         dgram->header.flags.node_type = M_NODE;
  53         dgram->header.flags.first = True;
  54         dgram->header.flags.more = False;
  55         dgram->header.dgm_id = dgm_id;
  56         /* source ip is filled by nmbd */
  57         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  58         dgram->header.packet_offset = 0;
  59
  60         make_nmb_name(&dgram->source_name,srcname,src_type);
  61         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  62
  63         ptr = &dgram->data[0];
  64
  65         /* Setup the smb part. */
  66         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  67         memcpy(tmp,ptr,4);
  68
  69         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  70                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  71                 return False;
  72         }
  73
  74         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  75         memcpy(ptr,tmp,4);
  76
  77         SCVAL(ptr,smb_com,SMBtrans);
  78         SSVAL(ptr,smb_vwv1,len);
  79         SSVAL(ptr,smb_vwv11,len);
  80         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  81         SSVAL(ptr,smb_vwv13,3);
  82         SSVAL(ptr,smb_vwv14,1);
  83         SSVAL(ptr,smb_vwv15,priority);
  84         SSVAL(ptr,smb_vwv16,2);
  85         p2 = smb_buf(ptr);
  86         fstrcpy(p2,mailslot);
  87         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  88         if (!p2) {
  89                 return False;
  90         }
  91
  92         memcpy(p2,buf,len);
  93         p2 += len;
  94
  95         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
  96
  97         p->packet_type = DGRAM_PACKET;
  98         p->ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
  99         p->timestamp = time(NULL);
 100
 101         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 102                  mailslot, nmb_namestr(&dgram->source_name)));
 103         print_sockaddr(addr, sizeof(addr), dest_ss);
 104
 105         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 106
 107         return true;
 108 }
 109
 110 static char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 111 {
 112         return talloc_asprintf(mem_ctx, "%s%X",
 113                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 114 }
 115
 116 static bool prep_getdc_request(const struct sockaddr_storage *dc_ss,
 117                                const char *domain_name,
 118                                const struct dom_sid *sid,
 119                                uint32_t nt_version,
 120                                const char *my_mailslot,
 121                                int dgm_id,
 122                                struct packet_struct *p)
 123 {
 124         TALLOC_CTX *frame = talloc_stackframe();
 125         const char *my_acct_name;
 126         struct nbt_netlogon_packet packet;
 127         struct NETLOGON_SAM_LOGON_REQUEST *s;
 128         enum ndr_err_code ndr_err;
 129         DATA_BLOB blob = data_blob_null;
 130         struct dom_sid my_sid;
 131         bool ret = false;
 132
 133         ZERO_STRUCT(packet);
 134         ZERO_STRUCT(my_sid);
 135
 136         if (sid != NULL) {
 137                 my_sid = *sid;
 138         }
 139
 140         my_acct_name = talloc_asprintf(talloc_tos(), "%s$", global_myname());
 141         if (my_acct_name == NULL) {
 142                 goto fail;
 143         }
 144
 145         packet.command  = LOGON_SAM_LOGON_REQUEST;
 146         s               = &packet.req.logon;
 147
 148         s->request_count        = 0;
 149         s->computer_name        = global_myname();
 150         s->user_name            = my_acct_name;
 151         s->mailslot_name        = my_mailslot;
 152         s->acct_control         = ACB_WSTRUST;
 153         s->sid                  = my_sid;
 154         s->nt_version           = nt_version;
 155         s->lmnt_token           = 0xffff;
 156         s->lm20_token           = 0xffff;
 157
 158         if (DEBUGLEVEL >= 10) {
 159                 NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
 160         }
 161
 162         ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
 163                        (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
 164         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 165                 goto fail;
 166         }
 167
 168         ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
 169                                 (char *)blob.data, blob.length,
 170                                 global_myname(), 0, domain_name, 0x1c,
 171                                 dc_ss, dgm_id, p);
 172 fail:
 173         TALLOC_FREE(frame);
 174         return ret;
 175 }
 176
 177 bool send_getdc_request(struct messaging_context *msg_ctx,
 178                         const struct sockaddr_storage *dc_ss,
 179                         const char *domain_name,
 180                         const struct dom_sid *sid,
 181                         uint32_t nt_version,
 182                         int dgm_id)
 183 {
 184         struct packet_struct p;
 185         pid_t nmbd_pid;
 186         char *my_mailslot;
 187         struct in_addr dc_ip;
 188         NTSTATUS status;
 189
 190         if ((nmbd_pid = pidfile_pid("nmbd")) == 0) {
 191                 DEBUG(3, ("No nmbd found\n"));
 192                 return False;
 193         }
 194
 195         if (dc_ss->ss_family != AF_INET) {
 196                 return false;
 197         }
 198         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 199
 200         my_mailslot = mailslot_name(talloc_tos(), dc_ip);
 201         if (my_mailslot == NULL) {
 202                 return NULL;
 203         }
 204
 205         if (!prep_getdc_request(dc_ss, domain_name, sid, nt_version,
 206                                 my_mailslot, dgm_id, &p)) {
 207                 TALLOC_FREE(my_mailslot);
 208                 return false;
 209         }
 210
 211         status = messaging_send_buf(msg_ctx, pid_to_procid(nmbd_pid),
 212                                     MSG_SEND_PACKET,
 213                                     (uint8 *)&p, sizeof(p));
 214         TALLOC_FREE(my_mailslot);
 215
 216         return NT_STATUS_IS_OK(status);
 217 }
 218
 219 bool receive_getdc_response(TALLOC_CTX *mem_ctx,
 220                             const struct sockaddr_storage *dc_ss,
 221                             const char *domain_name,
 222                             int dgm_id,
 223                             uint32_t *nt_version,
 224                             const char **dc_name,
 225                             struct netlogon_samlogon_response **samlogon_response)
 226 {
 227         struct packet_struct *packet = NULL;
 228         char *my_mailslot = NULL;
 229         struct in_addr dc_ip;
 230         DATA_BLOB blob;
 231         struct netlogon_samlogon_response *r = NULL;
 232         union dgram_message_body p;
 233         enum ndr_err_code ndr_err;
 234         NTSTATUS status;
 235
 236         const char *returned_dc = NULL;
 237         const char *returned_domain = NULL;
 238
 239         if (dc_ss->ss_family != AF_INET) {
 240                 return false;
 241         }
 242
 243         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 244
 245         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 246         if (!my_mailslot) {
 247                 return false;
 248         }
 249
 250         packet = receive_unexpected(DGRAM_PACKET, dgm_id, my_mailslot);
 251
 252         if (packet == NULL) {
 253                 DEBUG(5, ("Did not receive packet for %s\n", my_mailslot));
 254                 return False;
 255         }
 256
 257         DEBUG(5, ("Received packet for %s\n", my_mailslot));
 258
 259         blob = data_blob_const(packet->packet.dgram.data,
 260                                packet->packet.dgram.datasize);
 261
 262         if (blob.length < 4) {
 263                 DEBUG(0,("invalid length: %d\n", (int)blob.length));
 264                 goto fail;
 265         }
 266
 267         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 268                 DEBUG(0,("invalid packet\n"));
 269                 goto fail;
 270         }
 271
 272         blob.data += 4;
 273         blob.length -= 4;
 274
 275         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 276                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 277         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 278                 DEBUG(0,("failed to parse packet\n"));
 279                 goto fail;
 280         }
 281
 282         if (p.smb.smb_command != SMB_TRANSACTION) {
 283                 DEBUG(0,("invalid smb_command: %d\n", p.smb.smb_command));
 284                 goto fail;
 285         }
 286
 287         if (DEBUGLEVEL >= 10) {
 288                 NDR_PRINT_DEBUG(dgram_smb_packet, &p);
 289         }
 290
 291         blob = p.smb.body.trans.data;
 292
 293         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 294         if (!r) {
 295                 goto fail;
 296         }
 297
 298         status = pull_netlogon_samlogon_response(&blob, mem_ctx, r);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 goto fail;
 301         }
 302
 303         map_netlogon_samlogon_response(r);
 304
 305         /* do we still need this ? */
 306         *nt_version = r->ntver;
 307
 308         returned_domain = r->data.nt5_ex.domain_name;
 309         returned_dc = r->data.nt5_ex.pdc_name;
 310
 311         if (!strequal(returned_domain, domain_name)) {
 312                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 313                           domain_name, returned_domain));
 314                 goto fail;
 315         }
 316
 317         *dc_name = talloc_strdup(mem_ctx, returned_dc);
 318         if (!*dc_name) {
 319                 goto fail;
 320         }
 321
 322         if (**dc_name == '\\')  *dc_name += 1;
 323         if (**dc_name == '\\')  *dc_name += 1;
 324
 325         if (samlogon_response) {
 326                 *samlogon_response = r;
 327         } else {
 328                 TALLOC_FREE(r);
 329         }
 330
 331         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 332                    *dc_name, returned_domain));
 333
 334         free_packet(packet);
 335         TALLOC_FREE(my_mailslot);
 336         return True;
 337
 338 fail:
 339         TALLOC_FREE(my_mailslot);
 340         TALLOC_FREE(r);
 341         if (packet != NULL) {
 342                 free_packet(packet);
 343         }
 344         return false;
 345 }