source4/smb_server/smb2/negprot.c

   1 /*
   2    Unix SMB2 implementation.
   3
   4    Copyright (C) Andrew Bartlett        2001-2005
   5    Copyright (C) Stefan Metzmacher      2005
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "auth/credentials/credentials.h"
  23 #include "auth/gensec/gensec.h"
  24 #include "libcli/raw/libcliraw.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "smb_server/smb_server.h"
  28 #include "smb_server/service_smb_proto.h"
  29 #include "smb_server/smb2/smb2_server.h"
  30 #include "smbd/service_stream.h"
  31 #include "param/param.h"
  32
  33 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
  34 {
  35         struct gensec_security *gensec_security;
  36         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  37         DATA_BLOB blob;
  38         NTSTATUS nt_status;
  39         struct cli_credentials *server_credentials;
  40
  41         nt_status = gensec_server_start(req,
  42                                         req->smb_conn->connection->event.ctx,
  43                                         req->smb_conn->lp_ctx,
  44                                         req->smb_conn->connection->msg_ctx,
  45                                         &gensec_security);
  46         if (!NT_STATUS_IS_OK(nt_status)) {
  47                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  48                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  49                 return nt_status;
  50         }
  51
  52         server_credentials = cli_credentials_init(req);
  53         if (!server_credentials) {
  54                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
  59         nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
  60         if (!NT_STATUS_IS_OK(nt_status)) {
  61                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  62                 talloc_free(server_credentials);
  63                 server_credentials = NULL;
  64         }
  65
  66         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  67
  68         gensec_set_target_service(gensec_security, "cifs");
  69
  70         gensec_set_credentials(gensec_security, server_credentials);
  71
  72         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  73         if (!NT_STATUS_IS_OK(nt_status)) {
  74                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  75                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  76                 return nt_status;
  77         }
  78
  79         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  80         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  81                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  82                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  83                 return nt_status;
  84         }
  85
  86         *_blob = blob;
  87         return NT_STATUS_OK;
  88 }
  89
  90 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  91 {
  92         NTSTATUS status;
  93         struct timeval current_time;
  94         struct timeval boot_time;
  95
  96         /* we only do dialect 0 for now */
  97         if (io->in.dialect_count < 1) {
  98                 return NT_STATUS_NOT_SUPPORTED;
  99         }
 100         if (io->in.dialects[0] != 0) {
 101                 DEBUG(0,("Got unexpected SMB2 dialect %u\n", io->in.dialects[0]));
 102         }
 103
 104         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
 105
 106         current_time = timeval_current(); /* TODO: handle timezone?! */
 107         boot_time = timeval_current(); /* TODO: fix me */
 108
 109         ZERO_STRUCT(io->out);
 110         io->out.security_mode      = 0; /* no signing yet */
 111          /* choose the first dialect offered for now */
 112         io->out.dialect_revision   = io->in.dialects[0];
 113         io->out.capabilities       = 0;
 114         io->out.max_transact_size  = 0x10000;
 115         io->out.max_read_size      = 0x10000;
 116         io->out.max_write_size     = 0x10000;
 117         io->out.system_time        = timeval_to_nttime(&current_time);
 118         io->out.server_start_time  = timeval_to_nttime(&boot_time);
 119         io->out.reserved2          = 0;
 120         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 121         NT_STATUS_NOT_OK_RETURN(status);
 122
 123         return NT_STATUS_OK;
 124 }
 125
 126 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 127 {
 128         NTSTATUS status;
 129         enum ndr_err_code ndr_err;
 130
 131         if (NT_STATUS_IS_ERR(req->status)) {
 132                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 133                 return;
 134         }
 135
 136         status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
 137         if (!NT_STATUS_IS_OK(status)) {
 138                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 139                 talloc_free(req);
 140                 return;
 141         }
 142
 143         SSVAL(req->out.body, 0x02, io->out.security_mode);
 144         SIVAL(req->out.body, 0x04, io->out.dialect_revision);
 145         SIVAL(req->out.body, 0x06, io->out.reserved);
 146         ndr_err = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
 147         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 148                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 149                 talloc_free(req);
 150                 return;
 151         }
 152         SIVAL(req->out.body, 0x18, io->out.capabilities);
 153         SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
 154         SIVAL(req->out.body, 0x20, io->out.max_read_size);
 155         SIVAL(req->out.body, 0x24, io->out.max_write_size);
 156         push_nttime(req->out.body, 0x28, io->out.system_time);
 157         push_nttime(req->out.body, 0x30, io->out.server_start_time);
 158         SIVAL(req->out.body, 0x3C, io->out.reserved2);
 159         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 160         if (!NT_STATUS_IS_OK(status)) {
 161                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 162                 talloc_free(req);
 163                 return;
 164         }
 165
 166         smb2srv_send_reply(req);
 167 }
 168
 169 void smb2srv_negprot_recv(struct smb2srv_request *req)
 170 {
 171         struct smb2_negprot *io;
 172         int i;
 173         enum ndr_err_code ndr_err;
 174
 175         if (req->in.body_size < 0x26) {
 176                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 177                 return;
 178         }
 179
 180         io = talloc(req, struct smb2_negprot);
 181         if (!io) {
 182                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 183                 talloc_free(req);
 184                 return;
 185         }
 186
 187         io->in.dialect_count = SVAL(req->in.body, 0x02);
 188         io->in.security_mode = SVAL(req->in.body, 0x04);
 189         io->in.reserved      = SVAL(req->in.body, 0x06);
 190         io->in.capabilities  = IVAL(req->in.body, 0x08);
 191         ndr_err = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
 192         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 193                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_FOOBAR));
 194                 talloc_free(req);
 195                 return;
 196         }
 197         io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
 198
 199         io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
 200         if (io->in.dialects == NULL) {
 201                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 202                 talloc_free(req);
 203                 return;
 204         }
 205         for (i=0;i<io->in.dialect_count;i++) {
 206                 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
 207         }
 208
 209         req->status = smb2srv_negprot_backend(req, io);
 210
 211         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 212                 talloc_free(req);
 213                 return;
 214         }
 215         smb2srv_negprot_send(req, io);
 216 }
 217
 218 /*
 219  * reply to a SMB negprot request with dialect "SMB 2.002"
 220  */
 221 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
 222 {
 223         struct smb2srv_request *req;
 224         uint32_t body_fixed_size = 0x26;
 225
 226         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
 227         if (!req) goto nomem;
 228         req->smb_conn           = smb_req->smb_conn;
 229         req->request_time       = smb_req->request_time;
 230         talloc_steal(req, smb_req);
 231
 232         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
 233         req->in.allocated = req->in.size;
 234         req->in.buffer    = talloc_array(req, uint8_t, req->in.allocated);
 235         if (!req->in.buffer) goto nomem;
 236         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
 237         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
 238         req->in.body_size = body_fixed_size;
 239         req->in.dynamic   = NULL;
 240
 241         smb2srv_setup_bufinfo(req);
 242
 243         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
 244         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
 245         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
 246         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
 247         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
 248         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
 249         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
 250         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
 251         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
 252         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
 253         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
 254         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
 255         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
 256
 257         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
 258         SSVAL(req->in.body, 0x00, 0x24);
 259
 260         SSVAL(req->in.body, 0x02, 1);
 261         memset(req->in.body+0x04, 0, 32);
 262         SSVAL(req->in.body, 0x24, 0);
 263
 264         smb2srv_negprot_recv(req);
 265         return;
 266 nomem:
 267         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 268         talloc_free(req);
 269         return;
 270 }