/* * Unix SMB/CIFS implementation. * RPC Pipe client / server routines * Almost completely rewritten by (C) Jeremy Allison 2005 - 2010 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . */ /* this module apparently provides an implementation of DCE/RPC over a * named pipe (IPC$ connection using SMBtrans). details of DCE/RPC * documentation are available (in on-line form) from the X-Open group. * * this module should provide a level of abstraction between SMB * and DCE/RPC, while minimising the amount of mallocs, unnecessary * data copies, and network traffic. * */ #include "includes.h" #include "srv_pipe_internal.h" #include "../librpc/gen_ndr/ndr_schannel.h" #include "../libcli/auth/schannel.h" #include "../libcli/auth/spnego.h" #include "../libcli/auth/ntlmssp.h" #undef DBGC_CLASS #define DBGC_CLASS DBGC_RPC_SRV static void free_pipe_ntlmssp_auth_data(struct pipe_auth_data *auth) { struct auth_ntlmssp_state *a = auth->a_u.auth_ntlmssp_state; if (a) { auth_ntlmssp_end(&a); } auth->a_u.auth_ntlmssp_state = NULL; } static DATA_BLOB generic_session_key(void) { return data_blob("SystemLibraryDTC", 16); } /******************************************************************* Generate the next PDU to be returned from the data in p->rdata. Handle NTLMSSP. ********************************************************************/ static bool create_next_pdu_ntlmssp(pipes_struct *p) { DATA_BLOB hdr; uint8_t hdr_flags; RPC_HDR_RESP hdr_resp; uint32 ss_padding_len = 0; uint32 data_space_available; uint32 data_len_left; uint32 data_len; NTSTATUS status; DATA_BLOB auth_blob; RPC_HDR_AUTH auth_info; uint8 auth_type, auth_level; struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state; TALLOC_CTX *frame; /* * If we're in the fault state, keep returning fault PDU's until * the pipe gets closed. JRA. */ if(p->fault_state) { setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR)); return True; } memset((char *)&hdr_resp, '\0', sizeof(hdr_resp)); /* Set up rpc header flags. */ if (p->out_data.data_sent_length == 0) { hdr_flags = DCERPC_PFC_FLAG_FIRST; } else { hdr_flags = 0; } /* * Work out how much we can fit in a single PDU. */ data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length; /* * Ensure there really is data left to send. */ if(!data_len_left) { DEBUG(0,("create_next_pdu_ntlmssp: no data left to send !\n")); return False; } /* Space available - not including padding. */ data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN - RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - NTLMSSP_SIG_SIZE; /* * The amount we send is the minimum of the available * space and the amount left to send. */ data_len = MIN(data_len_left, data_space_available); /* Work out any padding alignment requirements. */ if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) { ss_padding_len = SERVER_NDR_PADDING_SIZE - ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE); DEBUG(10,("create_next_pdu_ntlmssp: adding sign/seal padding of %u\n", ss_padding_len )); /* If we're over filling the packet, we need to make space * for the padding at the end of the data. */ if (data_len + ss_padding_len > data_space_available) { data_len -= SERVER_NDR_PADDING_SIZE; } } /* * Set up the alloc hint. This should be the data left to * send. */ hdr_resp.alloc_hint = data_len_left; /* * Work out if this PDU will be the last. */ if (p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) { hdr_flags |= DCERPC_PFC_FLAG_LAST; } /* * Init the parse struct to point at the outgoing * data. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); status = dcerpc_push_ncacn_packet_header( prs_get_mem_context(&p->out_data.frag), DCERPC_PKT_RESPONSE, hdr_flags, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len + ss_padding_len + RPC_HDR_AUTH_LEN + NTLMSSP_SIG_SIZE, NTLMSSP_SIG_SIZE, p->call_id, &hdr); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to marshall RPC Header.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Store the header in the data stream. */ if (!prs_copy_data_in(&p->out_data.frag, (char *)hdr.data, hdr.length)) { DEBUG(0, ("Out of memory.\n")); prs_mem_free(&p->out_data.frag); return False; } if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) { DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_RESP.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Copy the data into the PDU. */ if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) { DEBUG(0,("create_next_pdu_ntlmssp: failed to copy %u bytes of data.\n", (unsigned int)data_len)); prs_mem_free(&p->out_data.frag); return False; } /* Copy the sign/seal padding data. */ if (ss_padding_len) { char pad[SERVER_NDR_PADDING_SIZE]; memset(pad, '\0', SERVER_NDR_PADDING_SIZE); if (!prs_copy_data_in(&p->out_data.frag, pad, ss_padding_len)) { DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes of pad data.\n", (unsigned int)ss_padding_len)); prs_mem_free(&p->out_data.frag); return False; } } /* Now write out the auth header and null blob. */ if (p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) { auth_type = DCERPC_AUTH_TYPE_NTLMSSP; } else { auth_type = DCERPC_AUTH_TYPE_SPNEGO; } if (p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY) { auth_level = DCERPC_AUTH_LEVEL_PRIVACY; } else { auth_level = DCERPC_AUTH_LEVEL_INTEGRITY; } init_rpc_hdr_auth(&auth_info, auth_type, auth_level, ss_padding_len, 1 /* context id. */); if (!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, &p->out_data.frag, 0)) { DEBUG(0,("create_next_pdu_ntlmssp: failed to marshall RPC_HDR_AUTH.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Generate the sign blob. */ frame = talloc_stackframe(); switch (p->auth.auth_level) { case DCERPC_AUTH_LEVEL_PRIVACY: /* Data portion is encrypted. */ status = auth_ntlmssp_seal_packet( a, frame, (uint8_t *)prs_data_p(&p->out_data.frag) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN, data_len + ss_padding_len, (unsigned char *)prs_data_p(&p->out_data.frag), (size_t)prs_offset(&p->out_data.frag), &auth_blob); if (!NT_STATUS_IS_OK(status)) { talloc_free(frame); prs_mem_free(&p->out_data.frag); return False; } break; case DCERPC_AUTH_LEVEL_INTEGRITY: /* Data is signed. */ status = auth_ntlmssp_sign_packet( a, frame, (unsigned char *)prs_data_p(&p->out_data.frag) + RPC_HEADER_LEN + RPC_HDR_RESP_LEN, data_len + ss_padding_len, (unsigned char *)prs_data_p(&p->out_data.frag), (size_t)prs_offset(&p->out_data.frag), &auth_blob); if (!NT_STATUS_IS_OK(status)) { talloc_free(frame); prs_mem_free(&p->out_data.frag); return False; } break; default: talloc_free(frame); prs_mem_free(&p->out_data.frag); return False; } /* Append the auth blob. */ if (!prs_copy_data_in(&p->out_data.frag, (char *)auth_blob.data, NTLMSSP_SIG_SIZE)) { DEBUG(0,("create_next_pdu_ntlmssp: failed to add %u bytes auth blob.\n", (unsigned int)NTLMSSP_SIG_SIZE)); talloc_free(frame); prs_mem_free(&p->out_data.frag); return False; } talloc_free(frame); /* * Setup the counts for this PDU. */ p->out_data.data_sent_length += data_len; p->out_data.current_pdu_sent = 0; return True; } /******************************************************************* Generate the next PDU to be returned from the data in p->rdata. Return an schannel authenticated fragment. ********************************************************************/ static bool create_next_pdu_schannel(pipes_struct *p) { DATA_BLOB hdr; uint8_t hdr_flags; RPC_HDR_RESP hdr_resp; uint32 ss_padding_len = 0; uint32 data_len; uint32 data_space_available; uint32 data_len_left; uint32 data_pos; NTSTATUS status; /* * If we're in the fault state, keep returning fault PDU's until * the pipe gets closed. JRA. */ if(p->fault_state) { setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR)); return True; } memset((char *)&hdr_resp, '\0', sizeof(hdr_resp)); /* Set up rpc header flags. */ if (p->out_data.data_sent_length == 0) { hdr_flags = DCERPC_PFC_FLAG_FIRST; } else { hdr_flags = 0; } /* * Work out how much we can fit in a single PDU. */ data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length; /* * Ensure there really is data left to send. */ if(!data_len_left) { DEBUG(0,("create_next_pdu_schannel: no data left to send !\n")); return False; } /* Space available - not including padding. */ data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN - RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN; /* * The amount we send is the minimum of the available * space and the amount left to send. */ data_len = MIN(data_len_left, data_space_available); /* Work out any padding alignment requirements. */ if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) { ss_padding_len = SERVER_NDR_PADDING_SIZE - ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE); DEBUG(10,("create_next_pdu_schannel: adding sign/seal padding of %u\n", ss_padding_len )); /* If we're over filling the packet, we need to make space * for the padding at the end of the data. */ if (data_len + ss_padding_len > data_space_available) { data_len -= SERVER_NDR_PADDING_SIZE; } } /* * Set up the alloc hint. This should be the data left to * send. */ hdr_resp.alloc_hint = data_len_left; /* * Work out if this PDU will be the last. */ if (p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) { hdr_flags |= DCERPC_PFC_FLAG_LAST; } /* * Init the parse struct to point at the outgoing * data. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); status = dcerpc_push_ncacn_packet_header( prs_get_mem_context(&p->out_data.frag), DCERPC_PKT_RESPONSE, hdr_flags, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len + ss_padding_len + RPC_HDR_AUTH_LEN + RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN, RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN, p->call_id, &hdr); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to marshall RPC Header.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Store the header in the data stream. */ if (!prs_copy_data_in(&p->out_data.frag, (char *)hdr.data, hdr.length)) { DEBUG(0, ("Out of memory.\n")); prs_mem_free(&p->out_data.frag); return False; } if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) { DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_RESP.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Store the current offset. */ data_pos = prs_offset(&p->out_data.frag); /* Copy the data into the PDU. */ if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) { DEBUG(0,("create_next_pdu_schannel: failed to copy %u bytes of data.\n", (unsigned int)data_len)); prs_mem_free(&p->out_data.frag); return False; } /* Copy the sign/seal padding data. */ if (ss_padding_len) { char pad[SERVER_NDR_PADDING_SIZE]; memset(pad, '\0', SERVER_NDR_PADDING_SIZE); if (!prs_copy_data_in(&p->out_data.frag, pad, ss_padding_len)) { DEBUG(0,("create_next_pdu_schannel: failed to add %u bytes of pad data.\n", (unsigned int)ss_padding_len)); prs_mem_free(&p->out_data.frag); return False; } } { /* * Schannel processing. */ RPC_HDR_AUTH auth_info; DATA_BLOB blob; uint8_t *data; /* Check it's the type of reply we were expecting to decode */ init_rpc_hdr_auth(&auth_info, DCERPC_AUTH_TYPE_SCHANNEL, p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY ? DCERPC_AUTH_LEVEL_PRIVACY : DCERPC_AUTH_LEVEL_INTEGRITY, ss_padding_len, 1); if (!smb_io_rpc_hdr_auth("hdr_auth", &auth_info, &p->out_data.frag, 0)) { DEBUG(0,("create_next_pdu_schannel: failed to marshall RPC_HDR_AUTH.\n")); prs_mem_free(&p->out_data.frag); return False; } data = (uint8_t *)prs_data_p(&p->out_data.frag) + data_pos; switch (p->auth.auth_level) { case DCERPC_AUTH_LEVEL_PRIVACY: status = netsec_outgoing_packet(p->auth.a_u.schannel_auth, talloc_tos(), true, data, data_len + ss_padding_len, &blob); break; case DCERPC_AUTH_LEVEL_INTEGRITY: status = netsec_outgoing_packet(p->auth.a_u.schannel_auth, talloc_tos(), false, data, data_len + ss_padding_len, &blob); break; default: status = NT_STATUS_INTERNAL_ERROR; break; } if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("create_next_pdu_schannel: failed to process packet: %s\n", nt_errstr(status))); prs_mem_free(&p->out_data.frag); return false; } /* Finally marshall the blob. */ if (DEBUGLEVEL >= 10) { dump_NL_AUTH_SIGNATURE(talloc_tos(), &blob); } if (!prs_copy_data_in(&p->out_data.frag, (const char *)blob.data, blob.length)) { prs_mem_free(&p->out_data.frag); return false; } } /* * Setup the counts for this PDU. */ p->out_data.data_sent_length += data_len; p->out_data.current_pdu_sent = 0; return True; } /******************************************************************* Generate the next PDU to be returned from the data in p->rdata. No authentication done. ********************************************************************/ static bool create_next_pdu_noauth(pipes_struct *p) { DATA_BLOB hdr; uint8_t hdr_flags; NTSTATUS status; RPC_HDR_RESP hdr_resp; uint32 data_len; uint32 data_space_available; uint32 data_len_left; /* * If we're in the fault state, keep returning fault PDU's until * the pipe gets closed. JRA. */ if(p->fault_state) { setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR)); return True; } memset((char *)&hdr_resp, '\0', sizeof(hdr_resp)); /* Set up rpc header flags. */ if (p->out_data.data_sent_length == 0) { hdr_flags = DCERPC_PFC_FLAG_FIRST; } else { hdr_flags = 0; } /* * Work out how much we can fit in a single PDU. */ data_len_left = prs_offset(&p->out_data.rdata) - p->out_data.data_sent_length; /* * Ensure there really is data left to send. */ if(!data_len_left) { DEBUG(0,("create_next_pdu_noath: no data left to send !\n")); return False; } data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN - RPC_HDR_RESP_LEN; /* * The amount we send is the minimum of the available * space and the amount left to send. */ data_len = MIN(data_len_left, data_space_available); /* * Set up the alloc hint. This should be the data left to * send. */ hdr_resp.alloc_hint = data_len_left; /* * Work out if this PDU will be the last. */ if(p->out_data.data_sent_length + data_len >= prs_offset(&p->out_data.rdata)) { hdr_flags |= DCERPC_PFC_FLAG_LAST; } /* * Init the parse struct to point at the outgoing * data. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); status = dcerpc_push_ncacn_packet_header( prs_get_mem_context(&p->out_data.frag), DCERPC_PKT_RESPONSE, hdr_flags, RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len, 0, p->call_id, &hdr); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to marshall RPC Header.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Store the header in the data stream. */ if (!prs_copy_data_in(&p->out_data.frag, (char *)hdr.data, hdr.length)) { DEBUG(0, ("Out of memory.\n")); prs_mem_free(&p->out_data.frag); return False; } if(!smb_io_rpc_hdr_resp("resp", &hdr_resp, &p->out_data.frag, 0)) { DEBUG(0,("create_next_pdu_noath: failed to marshall RPC_HDR_RESP.\n")); prs_mem_free(&p->out_data.frag); return False; } /* Copy the data into the PDU. */ if(!prs_append_some_prs_data(&p->out_data.frag, &p->out_data.rdata, p->out_data.data_sent_length, data_len)) { DEBUG(0,("create_next_pdu_noauth: failed to copy %u bytes of data.\n", (unsigned int)data_len)); prs_mem_free(&p->out_data.frag); return False; } /* * Setup the counts for this PDU. */ p->out_data.data_sent_length += data_len; p->out_data.current_pdu_sent = 0; return True; } /******************************************************************* Generate the next PDU to be returned from the data in p->rdata. ********************************************************************/ bool create_next_pdu(pipes_struct *p) { switch(p->auth.auth_level) { case DCERPC_AUTH_LEVEL_NONE: case DCERPC_AUTH_LEVEL_CONNECT: /* This is incorrect for auth level connect. Fixme. JRA */ return create_next_pdu_noauth(p); default: switch(p->auth.auth_type) { case PIPE_AUTH_TYPE_NTLMSSP: case PIPE_AUTH_TYPE_SPNEGO_NTLMSSP: return create_next_pdu_ntlmssp(p); case PIPE_AUTH_TYPE_SCHANNEL: return create_next_pdu_schannel(p); default: break; } } DEBUG(0,("create_next_pdu: invalid internal auth level %u / type %u", (unsigned int)p->auth.auth_level, (unsigned int)p->auth.auth_type)); return False; } /******************************************************************* Process an NTLMSSP authentication response. If this function succeeds, the user has been authenticated and their domain, name and calling workstation stored in the pipe struct. *******************************************************************/ static bool pipe_ntlmssp_verify_final(pipes_struct *p, DATA_BLOB *p_resp_blob) { DATA_BLOB session_key, reply; NTSTATUS status; struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state; bool ret; DEBUG(5,("pipe_ntlmssp_verify_final: pipe %s checking user details\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); ZERO_STRUCT(reply); /* this has to be done as root in order to verify the password */ become_root(); status = auth_ntlmssp_update(a, *p_resp_blob, &reply); unbecome_root(); /* Don't generate a reply. */ data_blob_free(&reply); if (!NT_STATUS_IS_OK(status)) { return False; } /* Finally - if the pipe negotiated integrity (sign) or privacy (seal) ensure the underlying NTLMSSP flags are also set. If not we should refuse the bind. */ if (p->auth.auth_level == DCERPC_AUTH_LEVEL_INTEGRITY) { if (!auth_ntlmssp_negotiated_sign(a)) { DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet integrity requested " "but client declined signing.\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); return False; } } if (p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY) { if (!auth_ntlmssp_negotiated_seal(a)) { DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet privacy requested " "but client declined sealing.\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); return False; } } DEBUG(5, ("pipe_ntlmssp_verify_final: OK: user: %s domain: %s " "workstation: %s\n", auth_ntlmssp_get_username(a), auth_ntlmssp_get_domain(a), auth_ntlmssp_get_client(a))); TALLOC_FREE(p->server_info); status = auth_ntlmssp_server_info(p, a, &p->server_info); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("auth_ntlmssp_server_info failed to obtain the server info for authenticated user: %s\n", nt_errstr(status))); return false; } if (p->server_info->ptok == NULL) { DEBUG(1,("Error: Authmodule failed to provide nt_user_token\n")); return False; } /* * We're an authenticated bind over smb, so the session key needs to * be set to "SystemLibraryDTC". Weird, but this is what Windows * does. See the RPC-SAMBA3SESSIONKEY. */ session_key = generic_session_key(); if (session_key.data == NULL) { return False; } ret = server_info_set_session_key(p->server_info, session_key); data_blob_free(&session_key); return True; } /******************************************************************* This is the "stage3" NTLMSSP response after a bind request and reply. *******************************************************************/ bool api_pipe_bind_auth3(pipes_struct *p, struct ncacn_packet *pkt) { struct dcerpc_auth auth_info; uint32_t auth_len = pkt->auth_length; NTSTATUS status; DEBUG(5,("api_pipe_bind_auth3: decode request. %d\n", __LINE__)); if (auth_len == 0) { DEBUG(0,("api_pipe_bind_auth3: No auth field sent !\n")); goto err; } /* Ensure there's enough data for an authenticated request. */ if (RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + auth_len > pkt->frag_length) { DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_len " "%u is too large.\n", (unsigned int)auth_len )); goto err; } /* * Decode the authentication verifier response. */ status = dcerpc_pull_dcerpc_auth(pkt, &pkt->u.auth3.auth_info, &auth_info); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to unmarshall dcerpc_auth.\n")); goto err; } /* We must NEVER look at auth_info->auth_pad_len here, * as old Samba client code gets it wrong and sends it * as zero. JRA. */ if (auth_info.auth_type != DCERPC_AUTH_TYPE_NTLMSSP) { DEBUG(0,("api_pipe_bind_auth3: incorrect auth type (%u).\n", (unsigned int)auth_info.auth_type )); return False; } /* * The following call actually checks the challenge/response data. * for correctness against the given DOMAIN\user name. */ if (!pipe_ntlmssp_verify_final(p, &auth_info.credentials)) { goto err; } p->pipe_bound = True; return True; err: free_pipe_ntlmssp_auth_data(&p->auth); p->auth.a_u.auth_ntlmssp_state = NULL; return False; } /******************************************************************* Marshall a bind_nak pdu. *******************************************************************/ static bool setup_bind_nak(pipes_struct *p, struct ncacn_packet *pkt) { NTSTATUS status; union dcerpc_payload u; DATA_BLOB blob; /* Free any memory in the current return data buffer. */ prs_mem_free(&p->out_data.rdata); /* * Marshall directly into the outgoing PDU space. We * must do this as we need to set to the bind response * header and are never sending more than one PDU here. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); /* * Initialize a bind_nak header. */ ZERO_STRUCT(u); u.bind_nak.reject_reason = 0; status = dcerpc_push_ncacn_packet(p->mem_ctx, DCERPC_PKT_BIND_NAK, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST, 0, pkt->call_id, &u, &blob); if (!NT_STATUS_IS_OK(status)) { prs_mem_free(&p->out_data.frag); return False; } if (!prs_copy_data_in(&p->out_data.frag, (char *)blob.data, blob.length)) { prs_mem_free(&p->out_data.frag); return False; } p->out_data.data_sent_length = 0; p->out_data.current_pdu_sent = 0; if (p->auth.auth_data_free_func) { (*p->auth.auth_data_free_func)(&p->auth); } p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE; p->auth.auth_type = PIPE_AUTH_TYPE_NONE; p->pipe_bound = False; return True; } /******************************************************************* Marshall a fault pdu. *******************************************************************/ bool setup_fault_pdu(pipes_struct *p, NTSTATUS fault_status) { NTSTATUS status; union dcerpc_payload u; DATA_BLOB blob; /* Free any memory in the current return data buffer. */ prs_mem_free(&p->out_data.rdata); /* * Marshall directly into the outgoing PDU space. We * must do this as we need to set to the bind response * header and are never sending more than one PDU here. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); /* * Initialize a fault header. */ ZERO_STRUCT(u); u.fault.status = NT_STATUS_V(fault_status); u.fault._pad = data_blob_talloc_zero(p->mem_ctx, 4); status = dcerpc_push_ncacn_packet(p->mem_ctx, DCERPC_PKT_FAULT, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST | DCERPC_PFC_FLAG_DID_NOT_EXECUTE, 0, p->call_id, &u, &blob); if (!NT_STATUS_IS_OK(status)) { prs_mem_free(&p->out_data.frag); return False; } if (!prs_copy_data_in(&p->out_data.frag, (char *)blob.data, blob.length)) { prs_mem_free(&p->out_data.frag); return False; } p->out_data.data_sent_length = 0; p->out_data.current_pdu_sent = 0; return True; } /******************************************************************* Ensure a bind request has the correct abstract & transfer interface. Used to reject unknown binds from Win2k. *******************************************************************/ static bool check_bind_req(struct pipes_struct *p, struct ndr_syntax_id* abstract, struct ndr_syntax_id* transfer, uint32 context_id) { struct pipe_rpc_fns *context_fns; DEBUG(3,("check_bind_req for %s\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); /* we have to check all now since win2k introduced a new UUID on the lsaprpc pipe */ if (rpc_srv_pipe_exists_by_id(abstract) && ndr_syntax_id_equal(transfer, &ndr_transfer_syntax)) { DEBUG(3, ("check_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n", rpc_srv_get_pipe_cli_name(abstract), rpc_srv_get_pipe_srv_name(abstract))); } else { return false; } context_fns = SMB_MALLOC_P(struct pipe_rpc_fns); if (context_fns == NULL) { DEBUG(0,("check_bind_req: malloc() failed!\n")); return False; } context_fns->n_cmds = rpc_srv_get_pipe_num_cmds(abstract); context_fns->cmds = rpc_srv_get_pipe_cmds(abstract); context_fns->context_id = context_id; /* add to the list of open contexts */ DLIST_ADD( p->contexts, context_fns ); return True; } /** * Is a named pipe known? * @param[in] cli_filename The pipe name requested by the client * @result Do we want to serve this? */ bool is_known_pipename(const char *cli_filename, struct ndr_syntax_id *syntax) { const char *pipename = cli_filename; NTSTATUS status; if (strnequal(pipename, "\\PIPE\\", 6)) { pipename += 5; } if (*pipename == '\\') { pipename += 1; } if (lp_disable_spoolss() && strequal(pipename, "spoolss")) { DEBUG(10, ("refusing spoolss access\n")); return false; } if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) { return true; } status = smb_probe_module("rpc", pipename); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("is_known_pipename: %s unknown\n", cli_filename)); return false; } DEBUG(10, ("is_known_pipename: %s loaded dynamically\n", pipename)); /* * Scan the list again for the interface id */ if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) { return true; } DEBUG(10, ("is_known_pipename: pipe %s did not register itself!\n", pipename)); return false; } /******************************************************************* Handle a SPNEGO krb5 bind auth. *******************************************************************/ static bool pipe_spnego_auth_bind_kerberos(pipes_struct *p, TALLOC_CTX *mem_ctx, struct dcerpc_auth *pauth_info, DATA_BLOB *psecblob, DATA_BLOB *response) { return False; } /******************************************************************* Handle the first part of a SPNEGO bind auth. *******************************************************************/ static bool pipe_spnego_auth_bind_negotiate(pipes_struct *p, TALLOC_CTX *mem_ctx, struct dcerpc_auth *pauth_info, DATA_BLOB *response) { DATA_BLOB secblob; DATA_BLOB chal; char *OIDs[ASN1_MAX_OIDS]; int i; NTSTATUS status; bool got_kerberos_mechanism = false; struct auth_ntlmssp_state *a = NULL; ZERO_STRUCT(secblob); ZERO_STRUCT(chal); if (pauth_info->credentials.data[0] != ASN1_APPLICATION(0)) { goto err; } /* parse out the OIDs and the first sec blob */ if (!parse_negTokenTarg(pauth_info->credentials, OIDs, &secblob)) { DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to parse the security blob.\n")); goto err; } if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 || strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) { got_kerberos_mechanism = true; } for (i=0;OIDs[i];i++) { DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got OID %s\n", OIDs[i])); TALLOC_FREE(OIDs[i]); } DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got secblob of size %lu\n", (unsigned long)secblob.length)); if ( got_kerberos_mechanism && ((lp_security()==SEC_ADS) || USE_KERBEROS_KEYTAB) ) { bool ret; ret = pipe_spnego_auth_bind_kerberos(p, mem_ctx, pauth_info, &secblob, response); data_blob_free(&secblob); return ret; } if (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP && p->auth.a_u.auth_ntlmssp_state) { /* Free any previous auth type. */ free_pipe_ntlmssp_auth_data(&p->auth); } if (!got_kerberos_mechanism) { /* Initialize the NTLM engine. */ status = auth_ntlmssp_start(&a); if (!NT_STATUS_IS_OK(status)) { goto err; } switch (pauth_info->auth_level) { case DCERPC_AUTH_LEVEL_INTEGRITY: auth_ntlmssp_want_sign(a); break; case DCERPC_AUTH_LEVEL_PRIVACY: auth_ntlmssp_want_seal(a); break; default: break; } /* * Pass the first security blob of data to it. * This can return an error or NT_STATUS_MORE_PROCESSING_REQUIRED * which means we need another packet to complete the bind. */ status = auth_ntlmssp_update(a, secblob, &chal); if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { DEBUG(3,("pipe_spnego_auth_bind_negotiate: auth_ntlmssp_update failed.\n")); goto err; } /* Generate the response blob we need for step 2 of the bind. */ *response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP); } else { /* * SPNEGO negotiate down to NTLMSSP. The subsequent * code to process follow-up packets is not complete * yet. JRA. */ *response = spnego_gen_auth_response(NULL, NT_STATUS_MORE_PROCESSING_REQUIRED, OID_NTLMSSP); } /* Make sure data is bound to the memctx, to be freed the caller */ talloc_steal(mem_ctx, response->data); /* auth_pad_len will be handled by the caller */ p->auth.a_u.auth_ntlmssp_state = a; p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data; p->auth.auth_type = PIPE_AUTH_TYPE_SPNEGO_NTLMSSP; data_blob_free(&secblob); data_blob_free(&chal); /* We can't set pipe_bound True yet - we need an RPC_ALTER_CONTEXT response packet... */ return True; err: data_blob_free(&secblob); data_blob_free(&chal); p->auth.a_u.auth_ntlmssp_state = NULL; return False; } /******************************************************************* Handle the second part of a SPNEGO bind auth. *******************************************************************/ static bool pipe_spnego_auth_bind_continue(pipes_struct *p, TALLOC_CTX *mem_ctx, struct dcerpc_auth *pauth_info, DATA_BLOB *response) { DATA_BLOB auth_blob; DATA_BLOB auth_reply; struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state; ZERO_STRUCT(auth_blob); ZERO_STRUCT(auth_reply); /* * NB. If we've negotiated down from krb5 to NTLMSSP we'll currently * fail here as 'a' == NULL. */ if (p->auth.auth_type != PIPE_AUTH_TYPE_SPNEGO_NTLMSSP || !a) { DEBUG(0,("pipe_spnego_auth_bind_continue: not in NTLMSSP auth state.\n")); goto err; } if (pauth_info->credentials.data[0] != ASN1_CONTEXT(1)) { DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob type.\n")); goto err; } if (!spnego_parse_auth(pauth_info->credentials, &auth_blob)) { DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob.\n")); goto err; } /* * The following call actually checks the challenge/response data. * for correctness against the given DOMAIN\user name. */ if (!pipe_ntlmssp_verify_final(p, &auth_blob)) { goto err; } data_blob_free(&auth_blob); /* Generate the spnego "accept completed" blob - no incoming data. */ *response = spnego_gen_auth_response(&auth_reply, NT_STATUS_OK, OID_NTLMSSP); /* Make sure data is bound to the memctx, to be freed the caller */ talloc_steal(mem_ctx, response->data); data_blob_free(&auth_reply); p->pipe_bound = True; return True; err: data_blob_free(&auth_blob); data_blob_free(&auth_reply); free_pipe_ntlmssp_auth_data(&p->auth); p->auth.a_u.auth_ntlmssp_state = NULL; return False; } /******************************************************************* Handle an schannel bind auth. *******************************************************************/ static bool pipe_schannel_auth_bind(pipes_struct *p, TALLOC_CTX *mem_ctx, struct dcerpc_auth *auth_info, DATA_BLOB *response) { struct NL_AUTH_MESSAGE neg; struct NL_AUTH_MESSAGE reply; bool ret; NTSTATUS status; struct netlogon_creds_CredentialState *creds; DATA_BLOB session_key; enum ndr_err_code ndr_err; ndr_err = ndr_pull_struct_blob( &auth_info->credentials, mem_ctx, &neg, (ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { DEBUG(0,("pipe_schannel_auth_bind: Could not unmarshal SCHANNEL auth neg\n")); return false; } if (DEBUGLEVEL >= 10) { NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &neg); } if (!(neg.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME)) { DEBUG(0,("pipe_schannel_auth_bind: Did not receive netbios computer name\n")); return false; } /* * The neg.oem_netbios_computer.a key here must match the remote computer name * given in the DOM_CLNT_SRV.uni_comp_name used on all netlogon pipe * operations that use credentials. */ become_root(); status = schannel_get_creds_state(p, lp_private_dir(), neg.oem_netbios_computer.a, &creds); unbecome_root(); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("pipe_schannel_auth_bind: Attempt to bind using schannel without successful serverauth2\n")); return False; } p->auth.a_u.schannel_auth = talloc(p, struct schannel_state); if (!p->auth.a_u.schannel_auth) { TALLOC_FREE(creds); return False; } p->auth.a_u.schannel_auth->state = SCHANNEL_STATE_START; p->auth.a_u.schannel_auth->seq_num = 0; p->auth.a_u.schannel_auth->initiator = false; p->auth.a_u.schannel_auth->creds = creds; /* * JRA. Should we also copy the schannel session key into the pipe session key p->session_key * here ? We do that for NTLMSSP, but the session key is already set up from the vuser * struct of the person who opened the pipe. I need to test this further. JRA. * * VL. As we are mapping this to guest set the generic key * "SystemLibraryDTC" key here. It's a bit difficult to test against * W2k3, as it does not allow schannel binds against SAMR and LSA * anymore. */ session_key = generic_session_key(); if (session_key.data == NULL) { DEBUG(0, ("pipe_schannel_auth_bind: Could not alloc session" " key\n")); return false; } ret = server_info_set_session_key(p->server_info, session_key); data_blob_free(&session_key); if (!ret) { DEBUG(0, ("server_info_set_session_key failed\n")); return false; } /*** SCHANNEL verifier ***/ reply.MessageType = NL_NEGOTIATE_RESPONSE; reply.Flags = 0; reply.Buffer.dummy = 5; /* ??? actually I don't think * this has any meaning * here - gd */ ndr_err = ndr_push_struct_blob(response, mem_ctx, &reply, (ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { DEBUG(0,("Failed to marshall NL_AUTH_MESSAGE.\n")); return false; } if (DEBUGLEVEL >= 10) { NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &reply); } DEBUG(10,("pipe_schannel_auth_bind: schannel auth: domain [%s] myname [%s]\n", neg.oem_netbios_domain.a, neg.oem_netbios_computer.a)); /* We're finished with this bind - no more packets. */ p->auth.auth_data_free_func = NULL; p->auth.auth_type = PIPE_AUTH_TYPE_SCHANNEL; p->pipe_bound = True; return True; } /******************************************************************* Handle an NTLMSSP bind auth. *******************************************************************/ static bool pipe_ntlmssp_auth_bind(pipes_struct *p, TALLOC_CTX *mem_ctx, struct dcerpc_auth *auth_info, DATA_BLOB *response) { NTSTATUS status; struct auth_ntlmssp_state *a = NULL; if (strncmp((char *)auth_info->credentials.data, "NTLMSSP", 7) != 0) { DEBUG(0, ("Failed to read NTLMSSP in blob\n")); goto err; } /* We have an NTLMSSP blob. */ status = auth_ntlmssp_start(&a); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_start failed: %s\n", nt_errstr(status) )); goto err; } switch (auth_info->auth_level) { case DCERPC_AUTH_LEVEL_INTEGRITY: auth_ntlmssp_want_sign(a); break; case DCERPC_AUTH_LEVEL_PRIVACY: auth_ntlmssp_want_seal(a); break; default: break; } status = auth_ntlmssp_update(a, auth_info->credentials, response); if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_update failed: %s\n", nt_errstr(status) )); goto err; } /* Make sure data is bound to the memctx, to be freed the caller */ talloc_steal(mem_ctx, response->data); p->auth.a_u.auth_ntlmssp_state = a; p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data; p->auth.auth_type = PIPE_AUTH_TYPE_NTLMSSP; DEBUG(10,("pipe_ntlmssp_auth_bind: NTLMSSP auth started\n")); /* We can't set pipe_bound True yet - we need an DCERPC_PKT_AUTH3 response packet... */ return True; err: free_pipe_ntlmssp_auth_data(&p->auth); p->auth.a_u.auth_ntlmssp_state = NULL; return False; } /******************************************************************* Respond to a pipe bind request. *******************************************************************/ bool api_pipe_bind_req(pipes_struct *p, struct ncacn_packet *pkt) { struct dcerpc_auth auth_info; uint16 assoc_gid; unsigned int auth_type = DCERPC_AUTH_TYPE_NONE; NTSTATUS status; struct ndr_syntax_id id; union dcerpc_payload u; struct dcerpc_ack_ctx bind_ack_ctx; DATA_BLOB auth_resp = data_blob_null; DATA_BLOB auth_blob = data_blob_null; DATA_BLOB blob = data_blob_null; int pad_len = 0; /* No rebinds on a bound pipe - use alter context. */ if (p->pipe_bound) { DEBUG(2,("api_pipe_bind_req: rejecting bind request on bound " "pipe %s.\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); return setup_bind_nak(p, pkt); } if (pkt->u.bind.num_contexts == 0) { DEBUG(0, ("api_pipe_bind_req: no rpc contexts around\n")); goto err_exit; } /* * Try and find the correct pipe name to ensure * that this is a pipe name we support. */ id = pkt->u.bind.ctx_list[0].abstract_syntax; if (rpc_srv_pipe_exists_by_id(&id)) { DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n", rpc_srv_get_pipe_cli_name(&id), rpc_srv_get_pipe_srv_name(&id))); } else { status = smb_probe_module( "rpc", get_pipe_name_from_syntax( talloc_tos(), &pkt->u.bind.ctx_list[0].abstract_syntax)); if (NT_STATUS_IS_ERR(status)) { DEBUG(3,("api_pipe_bind_req: Unknown pipe name %s in bind request.\n", get_pipe_name_from_syntax( talloc_tos(), &pkt->u.bind.ctx_list[0].abstract_syntax))); return setup_bind_nak(p, pkt); } if (rpc_srv_get_pipe_interface_by_cli_name( get_pipe_name_from_syntax(talloc_tos(), &p->syntax), &id)) { DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n", rpc_srv_get_pipe_cli_name(&id), rpc_srv_get_pipe_srv_name(&id))); } else { DEBUG(0, ("module %s doesn't provide functions for " "pipe %s!\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax), get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); return setup_bind_nak(p, pkt); } } DEBUG(5,("api_pipe_bind_req: make response. %d\n", __LINE__)); if (pkt->u.bind.assoc_group_id != 0) { assoc_gid = pkt->u.bind.assoc_group_id; } else { assoc_gid = 0x53f0; } /* * Marshall directly into the outgoing PDU space. We * must do this as we need to set to the bind response * header and are never sending more than one PDU here. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); /* * Create the bind response struct. */ /* If the requested abstract synt uuid doesn't match our client pipe, reject the bind_ack & set the transfer interface synt to all 0's, ver 0 (observed when NT5 attempts to bind to abstract interfaces unknown to NT4) Needed when adding entries to a DACL from NT5 - SK */ if (check_bind_req(p, &pkt->u.bind.ctx_list[0].abstract_syntax, &pkt->u.bind.ctx_list[0].transfer_syntaxes[0], pkt->u.bind.ctx_list[0].context_id)) { bind_ack_ctx.result = 0; bind_ack_ctx.reason = 0; bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0]; } else { p->pipe_bound = False; /* Rejection reason: abstract syntax not supported */ bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT; bind_ack_ctx.reason = DCERPC_BIND_REASON_ASYNTAX; bind_ack_ctx.syntax = null_ndr_syntax_id; } /* * Check if this is an authenticated bind request. */ if (pkt->auth_length) { /* Quick length check. Won't catch a bad auth footer, * prevents overrun. */ if (pkt->frag_length < RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + pkt->auth_length) { DEBUG(0,("api_pipe_bind_req: auth_len (%u) " "too long for fragment %u.\n", (unsigned int)pkt->auth_length, (unsigned int)pkt->frag_length)); goto err_exit; } /* * Decode the authentication verifier. */ status = dcerpc_pull_dcerpc_auth(pkt, &pkt->u.bind.auth_info, &auth_info); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n")); goto err_exit; } auth_type = auth_info.auth_type; /* Work out if we have to sign or seal etc. */ switch (auth_info.auth_level) { case DCERPC_AUTH_LEVEL_INTEGRITY: p->auth.auth_level = DCERPC_AUTH_LEVEL_INTEGRITY; break; case DCERPC_AUTH_LEVEL_PRIVACY: p->auth.auth_level = DCERPC_AUTH_LEVEL_PRIVACY; break; default: DEBUG(0, ("Unexpected auth level (%u).\n", (unsigned int)auth_info.auth_level )); goto err_exit; } switch (auth_type) { case DCERPC_AUTH_TYPE_NTLMSSP: if (!pipe_ntlmssp_auth_bind(p, pkt, &auth_info, &auth_resp)) { goto err_exit; } assoc_gid = 0x7a77; break; case DCERPC_AUTH_TYPE_SCHANNEL: if (!pipe_schannel_auth_bind(p, pkt, &auth_info, &auth_resp)) { goto err_exit; } break; case DCERPC_AUTH_TYPE_SPNEGO: if (!pipe_spnego_auth_bind_negotiate(p, pkt, &auth_info, &auth_resp)) { goto err_exit; } break; case DCERPC_AUTH_TYPE_NONE: break; default: DEBUG(0, ("Unknown auth type %x requested.\n", auth_type)); goto err_exit; } } if (auth_type == DCERPC_AUTH_TYPE_NONE) { /* Unauthenticated bind request. */ /* We're finished - no more packets. */ p->auth.auth_type = PIPE_AUTH_TYPE_NONE; /* We must set the pipe auth_level here also. */ p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE; p->pipe_bound = True; /* The session key was initialized from the SMB * session in make_internal_rpc_pipe_p */ } ZERO_STRUCT(u.bind_ack); u.bind_ack.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN; u.bind_ack.max_recv_frag = RPC_MAX_PDU_FRAG_LEN; u.bind_ack.assoc_group_id = assoc_gid; /* name has to be \PIPE\xxxxx */ u.bind_ack.secondary_address = talloc_asprintf(pkt, "\\PIPE\\%s", rpc_srv_get_pipe_srv_name(&id)); if (!u.bind_ack.secondary_address) { DEBUG(0, ("Out of memory!\n")); goto err_exit; } u.bind_ack.secondary_address_size = strlen(u.bind_ack.secondary_address) + 1; u.bind_ack.num_results = 1; u.bind_ack.ctx_list = &bind_ack_ctx; /* NOTE: We leave the auth_info empty so we can calculate the padding * later and then append the auth_info --simo */ status = dcerpc_push_ncacn_packet(pkt, DCERPC_PKT_BIND_ACK, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST, auth_resp.length, pkt->call_id, &u, &blob); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n", nt_errstr(status))); } if (auth_resp.length) { /* Work out any padding needed before the auth footer. */ pad_len = blob.length % SERVER_NDR_PADDING_SIZE; if (pad_len) { pad_len = SERVER_NDR_PADDING_SIZE - pad_len; DEBUG(10, ("auth pad_len = %u\n", (unsigned int)pad_len)); } status = dcerpc_push_dcerpc_auth(pkt, auth_type, auth_info.auth_level, pad_len, 1, /* auth_context_id */ &auth_resp, &auth_blob); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Marshalling of dcerpc_auth failed.\n")); goto err_exit; } } /* Now that we have the auth len store it into the right place in * the dcerpc header */ dcerpc_set_frag_length(&blob, blob.length + pad_len + auth_blob.length); /* And finally copy all bits in the output pdu */ if (!prs_copy_data_in(&p->out_data.frag, (char *)blob.data, blob.length)) { DEBUG(0, ("Failed to copy data to output buffer.\n")); goto err_exit; } if (auth_blob.length) { if (pad_len) { char pad[SERVER_NDR_PADDING_SIZE]; memset(pad, '\0', SERVER_NDR_PADDING_SIZE); if (!prs_copy_data_in(&p->out_data.frag, pad, pad_len)) { DEBUG(0, ("api_pipe_bind_req: failed to add " "%u bytes of pad data.\n", (unsigned int)pad_len)); goto err_exit; } } if (!prs_copy_data_in(&p->out_data.frag, (char *)auth_blob.data, auth_blob.length)) { DEBUG(0, ("Append of auth info failed.\n")); goto err_exit; } } /* * Setup the lengths for the initial reply. */ p->out_data.data_sent_length = 0; p->out_data.current_pdu_sent = 0; TALLOC_FREE(auth_blob.data); TALLOC_FREE(blob.data); return True; err_exit: prs_mem_free(&p->out_data.frag); TALLOC_FREE(auth_blob.data); TALLOC_FREE(blob.data); return setup_bind_nak(p, pkt); } /**************************************************************************** Deal with an alter context call. Can be third part of 3 leg auth request for SPNEGO calls. ****************************************************************************/ bool api_pipe_alter_context(pipes_struct *p, struct ncacn_packet *pkt) { struct dcerpc_auth auth_info; uint16 assoc_gid; NTSTATUS status; union dcerpc_payload u; struct dcerpc_ack_ctx bind_ack_ctx; DATA_BLOB auth_resp = data_blob_null; DATA_BLOB auth_blob = data_blob_null; DATA_BLOB blob = data_blob_null; int pad_len = 0; DEBUG(5,("api_pipe_alter_context: make response. %d\n", __LINE__)); if (pkt->u.bind.assoc_group_id != 0) { assoc_gid = pkt->u.bind.assoc_group_id; } else { assoc_gid = 0x53f0; } /* * Marshall directly into the outgoing PDU space. We * must do this as we need to set to the bind response * header and are never sending more than one PDU here. */ prs_init_empty(&p->out_data.frag, p->mem_ctx, MARSHALL); /* * Create the bind response struct. */ /* If the requested abstract synt uuid doesn't match our client pipe, reject the bind_ack & set the transfer interface synt to all 0's, ver 0 (observed when NT5 attempts to bind to abstract interfaces unknown to NT4) Needed when adding entries to a DACL from NT5 - SK */ if (check_bind_req(p, &pkt->u.bind.ctx_list[0].abstract_syntax, &pkt->u.bind.ctx_list[0].transfer_syntaxes[0], pkt->u.bind.ctx_list[0].context_id)) { bind_ack_ctx.result = 0; bind_ack_ctx.reason = 0; bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0]; } else { p->pipe_bound = False; /* Rejection reason: abstract syntax not supported */ bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT; bind_ack_ctx.reason = DCERPC_BIND_REASON_ASYNTAX; bind_ack_ctx.syntax = null_ndr_syntax_id; } /* * Check if this is an authenticated alter context request. */ if (pkt->auth_length) { /* Quick length check. Won't catch a bad auth footer, * prevents overrun. */ if (pkt->frag_length < RPC_HEADER_LEN + RPC_HDR_AUTH_LEN + pkt->auth_length) { DEBUG(0,("api_pipe_alter_context: auth_len (%u) " "too long for fragment %u.\n", (unsigned int)pkt->auth_length, (unsigned int)pkt->frag_length )); goto err_exit; } status = dcerpc_pull_dcerpc_auth(pkt, &pkt->u.bind.auth_info, &auth_info); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n")); goto err_exit; } /* * Currently only the SPNEGO auth type uses the alter ctx * response in place of the NTLMSSP auth3 type. */ if (auth_info.auth_type == DCERPC_AUTH_TYPE_SPNEGO) { /* We can only finish if the pipe is unbound. */ if (!p->pipe_bound) { if (!pipe_spnego_auth_bind_continue(p, pkt, &auth_info, &auth_resp)) { goto err_exit; } } else { goto err_exit; } } } ZERO_STRUCT(u.alter_resp); u.alter_resp.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN; u.alter_resp.max_recv_frag = RPC_MAX_PDU_FRAG_LEN; u.alter_resp.assoc_group_id = assoc_gid; /* secondary address CAN be NULL * as the specs say it's ignored. * It MUST be NULL to have the spoolss working. */ u.alter_resp.secondary_address = ""; u.alter_resp.secondary_address_size = 1; u.alter_resp.num_results = 1; u.alter_resp.ctx_list = &bind_ack_ctx; /* NOTE: We leave the auth_info empty so we can calculate the padding * later and then append the auth_info --simo */ status = dcerpc_push_ncacn_packet(pkt, DCERPC_PKT_ALTER_RESP, DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST, auth_resp.length, pkt->call_id, &u, &blob); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n", nt_errstr(status))); } if (auth_resp.length) { /* Work out any padding needed before the auth footer. */ pad_len = blob.length % SERVER_NDR_PADDING_SIZE; if (pad_len) { pad_len = SERVER_NDR_PADDING_SIZE - pad_len; DEBUG(10, ("auth pad_len = %u\n", (unsigned int)pad_len)); } status = dcerpc_push_dcerpc_auth(pkt, auth_info.auth_type, auth_info.auth_level, pad_len, 1, /* auth_context_id */ &auth_resp, &auth_blob); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Marshalling of dcerpc_auth failed.\n")); goto err_exit; } } /* Now that we have the auth len store it into the right place in * the dcerpc header */ dcerpc_set_frag_length(&blob, blob.length + pad_len + auth_blob.length); /* And finally copy all bits in the output pdu */ if (!prs_copy_data_in(&p->out_data.frag, (char *)blob.data, blob.length)) { DEBUG(0, ("Failed to copy data to output buffer.\n")); goto err_exit; } if (auth_resp.length) { if (pad_len) { char pad[SERVER_NDR_PADDING_SIZE]; memset(pad, '\0', SERVER_NDR_PADDING_SIZE); if (!prs_copy_data_in(&p->out_data.frag, pad, pad_len)) { DEBUG(0, ("api_pipe_bind_req: failed to add " "%u bytes of pad data.\n", (unsigned int)pad_len)); goto err_exit; } } if (!prs_copy_data_in(&p->out_data.frag, (char *)auth_blob.data, auth_blob.length)) { DEBUG(0, ("Append of auth info failed.\n")); goto err_exit; } } /* * Setup the lengths for the initial reply. */ p->out_data.data_sent_length = 0; p->out_data.current_pdu_sent = 0; TALLOC_FREE(auth_blob.data); TALLOC_FREE(blob.data); return True; err_exit: prs_mem_free(&p->out_data.frag); TALLOC_FREE(auth_blob.data); TALLOC_FREE(blob.data); return setup_bind_nak(p, pkt); } /**************************************************************************** Find the set of RPC functions associated with this context_id ****************************************************************************/ static PIPE_RPC_FNS* find_pipe_fns_by_context( PIPE_RPC_FNS *list, uint32 context_id ) { PIPE_RPC_FNS *fns = NULL; if ( !list ) { DEBUG(0,("find_pipe_fns_by_context: ERROR! No context list for pipe!\n")); return NULL; } for (fns=list; fns; fns=fns->next ) { if ( fns->context_id == context_id ) return fns; } return NULL; } /**************************************************************************** Memory cleanup. ****************************************************************************/ void free_pipe_rpc_context( PIPE_RPC_FNS *list ) { PIPE_RPC_FNS *tmp = list; PIPE_RPC_FNS *tmp2; while (tmp) { tmp2 = tmp->next; SAFE_FREE(tmp); tmp = tmp2; } return; } static bool api_rpcTNP(pipes_struct *p, struct ncacn_packet *pkt, const struct api_struct *api_rpc_cmds, int n_cmds); /**************************************************************************** Find the correct RPC function to call for this request. If the pipe is authenticated then become the correct UNIX user before doing the call. ****************************************************************************/ bool api_pipe_request(pipes_struct *p, struct ncacn_packet *pkt) { bool ret = False; bool changed_user = False; PIPE_RPC_FNS *pipe_fns; if (p->pipe_bound && ((p->auth.auth_type == PIPE_AUTH_TYPE_NTLMSSP) || (p->auth.auth_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP))) { if(!become_authenticated_pipe_user(p)) { prs_mem_free(&p->out_data.rdata); return False; } changed_user = True; } DEBUG(5, ("Requested \\PIPE\\%s\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); /* get the set of RPC functions for this context */ pipe_fns = find_pipe_fns_by_context(p->contexts, pkt->u.request.context_id); if ( pipe_fns ) { TALLOC_CTX *frame = talloc_stackframe(); ret = api_rpcTNP(p, pkt, pipe_fns->cmds, pipe_fns->n_cmds); TALLOC_FREE(frame); } else { DEBUG(0, ("No rpc function table associated with context " "[%d] on pipe [%s]\n", pkt->u.request.context_id, get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); } if (changed_user) { unbecome_authenticated_pipe_user(); } return ret; } /******************************************************************* Calls the underlying RPC function for a named pipe. ********************************************************************/ static bool api_rpcTNP(pipes_struct *p, struct ncacn_packet *pkt, const struct api_struct *api_rpc_cmds, int n_cmds) { int fn_num; uint32 offset1, offset2; /* interpret the command */ DEBUG(4,("api_rpcTNP: %s op 0x%x - ", get_pipe_name_from_syntax(talloc_tos(), &p->syntax), pkt->u.request.opnum)); if (DEBUGLEVEL >= 50) { fstring name; slprintf(name, sizeof(name)-1, "in_%s", get_pipe_name_from_syntax(talloc_tos(), &p->syntax)); prs_dump(name, pkt->u.request.opnum, &p->in_data.data); } for (fn_num = 0; fn_num < n_cmds; fn_num++) { if (api_rpc_cmds[fn_num].opnum == pkt->u.request.opnum && api_rpc_cmds[fn_num].fn != NULL) { DEBUG(3, ("api_rpcTNP: rpc command: %s\n", api_rpc_cmds[fn_num].name)); break; } } if (fn_num == n_cmds) { /* * For an unknown RPC just return a fault PDU but * return True to allow RPC's on the pipe to continue * and not put the pipe into fault state. JRA. */ DEBUG(4, ("unknown\n")); setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR)); return True; } offset1 = prs_offset(&p->out_data.rdata); DEBUG(6, ("api_rpc_cmds[%d].fn == %p\n", fn_num, api_rpc_cmds[fn_num].fn)); /* do the actual command */ if(!api_rpc_cmds[fn_num].fn(p)) { DEBUG(0,("api_rpcTNP: %s: %s failed.\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax), api_rpc_cmds[fn_num].name)); prs_mem_free(&p->out_data.rdata); return False; } if (p->bad_handle_fault_state) { DEBUG(4,("api_rpcTNP: bad handle fault return.\n")); p->bad_handle_fault_state = False; setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_CONTEXT_MISMATCH)); return True; } if (p->rng_fault_state) { DEBUG(4, ("api_rpcTNP: rng fault return\n")); p->rng_fault_state = False; setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR)); return True; } offset2 = prs_offset(&p->out_data.rdata); prs_set_offset(&p->out_data.rdata, offset1); if (DEBUGLEVEL >= 50) { fstring name; slprintf(name, sizeof(name)-1, "out_%s", get_pipe_name_from_syntax(talloc_tos(), &p->syntax)); prs_dump(name, pkt->u.request.opnum, &p->out_data.rdata); } prs_set_offset(&p->out_data.rdata, offset2); DEBUG(5,("api_rpcTNP: called %s successfully\n", get_pipe_name_from_syntax(talloc_tos(), &p->syntax))); /* Check for buffer underflow in rpc parsing */ if ((DEBUGLEVEL >= 10) && (prs_offset(&p->in_data.data) != prs_data_size(&p->in_data.data))) { size_t data_len = prs_data_size(&p->in_data.data) - prs_offset(&p->in_data.data); char *data = (char *)SMB_MALLOC(data_len); DEBUG(10, ("api_rpcTNP: rpc input buffer underflow (parse error?)\n")); if (data) { prs_uint8s(False, "", &p->in_data.data, 0, (unsigned char *)data, (uint32)data_len); SAFE_FREE(data); } } return True; }