smb_file *smb_find(smb_session *s, smb_tid tid, const char *pattern) { smb_message *msg; smb_trans2_req *tr2; smb_tr2_find2 *find; size_t pattern_len, msg_len; int res; assert(s != NULL && pattern != NULL && tid); pattern_len = strlen(pattern) + 1; msg_len = sizeof(smb_trans2_req) + sizeof(smb_tr2_find2); msg_len += pattern_len * 2 + 3; msg = smb_message_new(SMB_CMD_TRANS2, msg_len); smb_message_set_default_flags(msg); msg->packet->header.tid = tid; tr2 = (smb_trans2_req *)msg->packet->payload; tr2->wct = 15; tr2->total_param_count = pattern_len * 2 + sizeof(smb_tr2_find2); tr2->max_param_count = 10; // ?? Why not the same or 12 ? tr2->max_data_count = 0xffff; tr2->param_count = tr2->total_param_count; tr2->param_offset = 68; // Offset of find_first_params in packet; tr2->data_count = 0; tr2->data_offset = 88; // Offset of pattern in packet tr2->setup_count = 1; tr2->cmd = SMB_TR2_FIND_FIRST; tr2->bct = sizeof(smb_tr2_find2) + pattern_len * 2 + 3; find = (smb_tr2_find2 *) tr2->payload; find->attrs = SMB_FIND2_ATTR_DEFAULT; find->count = 1366; // ?? find->flags = SMB_FIND2_FLAG_DEFAULT; find->interest = 0x0104; // 'Find file both directory info' smb_message_advance(msg, sizeof(smb_trans2_req)); smb_message_advance(msg, sizeof(smb_tr2_find2)); smb_message_put_utf16(msg, "", pattern, pattern_len); // Adds padding at the end if necessary. if (tr2->bct % 4) smb_message_advance(msg, 4 - tr2->bct % 4); res = smb_session_send_msg(s, msg); smb_message_destroy(msg); if (!res) { BDSM_dbg("Unable to query pattern: %s\n", pattern); return (NULL); } if ((msg = smb_tr2_recv(s)) == NULL) return (NULL); return (smb_find_parse(msg)); }
static int negotiate(smb_session *s, const char *domain) { smb_message *msg = NULL; smb_session_xsec_req req; smb_buffer ntlm; ASN1_TYPE token; int res, der_size = 128; char der[128], err_desc[ASN1_MAX_ERROR_DESCRIPTION_SIZE]; msg = smb_message_new(SMB_CMD_SETUP); if (!msg) return DSM_ERROR_GENERIC; // this struct will be set at the end when we know the payload size SMB_MSG_ADVANCE_PKT(msg, smb_session_xsec_req); asn1_create_element(s->spnego_asn1, "SPNEGO.GSSAPIContextToken", &token); res = asn1_write_value(token, "thisMech", spnego_oid, 1); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "spnego", "negTokenInit", 1); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "spnego.negTokenInit.mechTypes", "NEW", 1); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "spnego.negTokenInit.mechTypes.?1", ntlmssp_oid, 1); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "spnego.negTokenInit.reqFlags", NULL, 0); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "spnego.negTokenInit.mechListMIC", NULL, 0); if (res != ASN1_SUCCESS) goto error; smb_ntlmssp_negotiate(domain, domain, &ntlm); res = asn1_write_value(token, "spnego.negTokenInit.mechToken", ntlm.data, ntlm.size); smb_buffer_free(&ntlm); if (res != ASN1_SUCCESS) goto error; res = asn1_der_coding(token, "", der, &der_size, err_desc); if (res != ASN1_SUCCESS) { smb_message_destroy(msg); BDSM_dbg("Encoding error: %s", err_desc); return DSM_ERROR_GENERIC; } smb_message_append(msg, der, der_size); smb_message_put_utf16(msg, SMB_OS, strlen(SMB_OS)); smb_message_put16(msg, 0); smb_message_put_utf16(msg, SMB_LANMAN, strlen(SMB_LANMAN)); smb_message_put16(msg, 0); smb_message_put16(msg, 0); SMB_MSG_INIT_PKT_ANDX(req); req.wct = 12; req.max_buffer = SMB_SESSION_MAX_BUFFER; req.mpx_count = 16; req.vc_count = 1; req.caps = s->srv.caps; req.session_key = s->srv.session_key; req.xsec_blob_size = der_size; req.payload_size = msg->cursor - sizeof(smb_session_xsec_req); SMB_MSG_INSERT_PKT(msg, 0, req); asn1_delete_structure(&token); if (!smb_session_send_msg(s, msg)) { smb_message_destroy(msg); BDSM_dbg("Unable to send Session Setup AndX (NTLMSSP_NEGOTIATE) message\n"); return DSM_ERROR_NETWORK; } smb_message_destroy(msg); return DSM_SUCCESS; error: asn1_display_error("smb_session_login negotiate()", res); smb_message_destroy(msg); return DSM_ERROR_GENERIC; }
static int auth(smb_session *s, const char *domain, const char *user, const char *password) { smb_message *msg = NULL, resp; smb_session_xsec_req req; smb_buffer ntlm; ASN1_TYPE token; int res, der_size = 512; char der[512], err_desc[ASN1_MAX_ERROR_DESCRIPTION_SIZE]; msg = smb_message_new(SMB_CMD_SETUP); if (!msg) return DSM_ERROR_GENERIC; // this struct will be set at the end when we know the payload size SMB_MSG_ADVANCE_PKT(msg, smb_session_xsec_req); asn1_create_element(s->spnego_asn1, "SPNEGO.NegotiationToken", &token); // Select a response message type res = asn1_write_value(token, "", "negTokenResp", 1); if (res != ASN1_SUCCESS) goto error; // Delete all optionnal field except 'ResponseToken' res = asn1_write_value(token, "negTokenResp.negResult", NULL, 0); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "negTokenResp.supportedMech", NULL, 0); if (res != ASN1_SUCCESS) goto error; res = asn1_write_value(token, "negTokenResp.mechListMIC", NULL, 0); if (res != ASN1_SUCCESS) goto error; smb_ntlmssp_response(s->srv.challenge, s->srv.ts - 4200, domain, domain, user, password, &s->xsec_target, &ntlm); res = asn1_write_value(token, "negTokenResp.responseToken", ntlm.data, ntlm.size); smb_buffer_free(&ntlm); if (res != ASN1_SUCCESS) goto error; res = asn1_der_coding(token, "", der, &der_size, err_desc); if (res != ASN1_SUCCESS) { smb_message_destroy(msg); BDSM_dbg("Encoding error: %s", err_desc); return DSM_ERROR_GENERIC; } smb_message_append(msg, der, der_size); if (msg->cursor % 2) smb_message_put8(msg, 0); smb_message_put_utf16(msg, SMB_OS, strlen(SMB_OS)); smb_message_put16(msg, 0); smb_message_put_utf16(msg, SMB_LANMAN, strlen(SMB_LANMAN)); smb_message_put16(msg, 0); smb_message_put16(msg, 0); // Empty PDC name SMB_MSG_INIT_PKT_ANDX(req); req.wct = 12; req.max_buffer = SMB_SESSION_MAX_BUFFER; req.mpx_count = 16; // XXX ? req.vc_count = 1; req.caps = s->srv.caps; // XXX caps & our_caps_mask req.session_key = s->srv.session_key; req.xsec_blob_size = der_size; req.payload_size = msg->cursor - sizeof(smb_session_xsec_req); SMB_MSG_INSERT_PKT(msg, 0, req); asn1_delete_structure(&token); if (!smb_session_send_msg(s, msg)) { smb_message_destroy(msg); BDSM_dbg("Unable to send Session Setup AndX (NTLMSSP_AUTH) message\n"); return DSM_ERROR_NETWORK; } smb_message_destroy(msg); if (smb_session_recv_msg(s, &resp) == 0) return DSM_ERROR_NETWORK; if (!smb_session_check_nt_status(s, &resp)) return DSM_ERROR_NT; else { smb_session_xsec_resp *r = (smb_session_xsec_resp *)resp.packet->payload; if (r->action & 0x0001) s->guest = true; s->srv.uid = resp.packet->header.uid; s->logged = true; return DSM_SUCCESS; } error: asn1_display_error("smb_session_login auth()", res); smb_message_destroy(msg); return DSM_ERROR_GENERIC; }
smb_file *smb_fstat(smb_session *s, smb_tid tid, const char *path) { smb_message *msg, reply; smb_trans2_req *tr2; smb_trans2_resp *tr2_resp; smb_tr2_query *query; smb_tr2_path_info *info; smb_file *file; size_t path_len, msg_len; int res; assert(s != NULL && path != NULL && tid); path_len = strlen(path) + 1; msg_len = sizeof(smb_trans2_req) + sizeof(smb_tr2_query); msg_len += path_len * 2 + 3; // +3 for eventual padding msg = smb_message_new(SMB_CMD_TRANS2, msg_len); smb_message_set_default_flags(msg); msg->packet->header.tid = tid; tr2 = (smb_trans2_req *)msg->packet->payload; tr2->wct = 15; tr2->total_param_count = path_len * 2 + sizeof(smb_tr2_query); tr2->max_param_count = 2; // ?? Why not the same or 12 ? tr2->max_data_count = 0xffff; tr2->param_count = tr2->total_param_count; tr2->param_offset = 68; // Offset of find_first_params in packet; tr2->data_count = 0; tr2->data_offset = 96; // Offset of pattern in packet tr2->setup_count = 1; tr2->cmd = SMB_TR2_QUERY_PATH; tr2->bct = sizeof(smb_tr2_query) + path_len * 2 + 3; query = (smb_tr2_query *)tr2->payload; query->interest = 0x0107; // Query File All Info smb_message_advance(msg, sizeof(smb_trans2_req)); smb_message_advance(msg, sizeof(smb_tr2_query)); smb_message_put_utf16(msg, "", path, path_len); // Adds padding at the end if necessary. if (msg->cursor % 4) { int padding = 4 - msg->cursor % 4; tr2->bct += padding; for (int i = 0; i < padding; i++) smb_message_put8(msg, 0); } res = smb_session_send_msg(s, msg); smb_message_destroy(msg); if (!res) { BDSM_dbg("Unable to query pattern: %s\n", path); return (NULL); } if (!smb_session_recv_msg(s, &reply) || reply.packet->header.status != NT_STATUS_SUCCESS) { BDSM_dbg("Unable to recv msg or failure for %s\n", path); return (NULL); } tr2_resp = (smb_trans2_resp *)reply.packet->payload; info = (smb_tr2_path_info *)(tr2_resp->payload + 4); //+4 is padding file = calloc(1, sizeof(smb_file)); assert(file != NULL); file->name_len = smb_from_utf16((const char *)info->name, info->name_len, &file->name); file->name[info->name_len] = 0; file->created = info->created; file->accessed = info->accessed; file->written = info->written; file->changed = info->changed; file->alloc_size = info->alloc_size; file->size = info->size; file->attr = info->attr; file->is_dir = info->is_dir; return (file); }
// We should normally implement SCERPC and SRVSVC to perform a share list. But // since these two protocols have no other use for us, we'll do it the trash way // PS: Worst function _EVER_. I don't understand a bit myself int smb_share_get_list(smb_session *s, smb_share_list *list, size_t *pcount) { smb_message *req, resp; smb_trans_req trans; smb_tid ipc_tid; smb_fd srvscv_fd; uint16_t rpc_len; size_t res, frag_len_cursor; ssize_t count; int ret; assert(s != NULL && list != NULL); if(s != NULL && list != NULL) { *list = NULL; if ((ret = smb_tree_connect(s, "IPC$", &ipc_tid)) != DSM_SUCCESS) return ret; if ((ret = smb_fopen(s, ipc_tid, "\\srvsvc", SMB_MOD_READ | SMB_MOD_WRITE, &srvscv_fd)) != DSM_SUCCESS) return ret; //// Phase 1: // We bind a context or whatever for DCE/RPC req = smb_message_new(SMD_CMD_TRANS); if (!req) { ret = DSM_ERROR_GENERIC; goto error; } req->packet->header.tid = ipc_tid; rpc_len = 0xffff; SMB_MSG_INIT_PKT(trans); trans.wct = 16; trans.total_data_count = 72; trans.max_data_count = rpc_len; trans.param_offset = 84; trans.data_count = 72; trans.data_offset = 84; trans.setup_count = 2; trans.pipe_function = 0x26; trans.fid = SMB_FD_FID(srvscv_fd); trans.bct = 89; SMB_MSG_PUT_PKT(req, trans); smb_message_put8(req, 0); // Padding smb_message_put_utf16(req, "\\PIPE\\", strlen("\\PIPE\\") + 1); smb_message_put16(req, 0); // Padding to be aligned with wtf boundary :-/ // Now we'll 'build' the DCE/RPC Packet. This basically a copycat // from wireshark values. smb_message_put8(req, 5); // version major smb_message_put8(req, 0); // minor smb_message_put8(req, 0x0b); // Packet type = 'bind' smb_message_put8(req, 0x03); // Packet flags = ?? smb_message_put32(req, 0x10); // Representation = little endian/ASCII. Damn smb_message_put16(req, 72); // Data len again smb_message_put16(req, 0); // Auth len ? smb_message_put32(req, 19); // Call ID ? smb_message_put16(req, rpc_len); // Max Xmit size smb_message_put16(req, rpc_len); // Max Recv size smb_message_put32(req, 0); // Assoc group ? smb_message_put32(req, 1); // Num Ctx Item // Adding the CtxItem, whatever could that be smb_message_put16(req, 0); // ContextID smb_message_put16(req, 1); // Num Trans Item // SRVSVC UUID const uint8_t uuid_e[8] = {0x12, 0x78, 0x5a, 0x47, 0xbf, 0x6e, 0xe1, 0x88}; smb_message_put_uuid(req, 0x4b324fc8, 0x1670, 0x01d3, uuid_e); smb_message_put16(req, 3); // Version smb_message_put16(req, 0); // Minor // Another UUID const uint8_t uuid_e2[8] = {0x9f, 0xe8, 0x08, 0x00, 0x2b, 0x10, 0x48, 0x60}; smb_message_put_uuid(req, 0x8a885d04, 0x1ceb, 0x11c9, uuid_e2); smb_message_put32(req, 2); // Another version // Let's send this ugly pile of shit over the network ! res = smb_session_send_msg(s, req); smb_message_destroy(req); if (!res) { ret = DSM_ERROR_NETWORK; goto error; } // Is the server throwing pile of shit back at me ? res = smb_session_recv_msg(s, &resp); if (!res || resp.packet->payload[68]) { BDSM_dbg("Bind call failed: 0x%hhx (reason = 0x%hhx)\n", resp.packet->payload[68], resp.packet->payload[70]); ret = DSM_ERROR_NETWORK; goto error; } //// Phase 2: // Now we have the 'bind' done (regarless of what it is), we'll call // NetShareEnumAll req = smb_message_new(SMD_CMD_TRANS); if (!req) { ret = DSM_ERROR_GENERIC; goto error; } req->packet->header.tid = ipc_tid; // this struct will be set at the end when we know the data size SMB_MSG_ADVANCE_PKT(req, smb_trans_req); smb_message_put8(req, 0); // Padding smb_message_put_utf16(req, "\\PIPE\\", strlen("\\PIPE\\") + 1); smb_message_put16(req, 0); // Padding // Now we'll 'build' the DCE/RPC Packet. This basically a copycat // from wireshark values. smb_message_put8(req, 5); // version major smb_message_put8(req, 0); // minor smb_message_put8(req, 0); // Packet type = 'request' smb_message_put8(req, 0x03); // Packet flags = ?? smb_message_put32(req, 0x10); // Representation = little endian/ASCII. Damn // Let's save the cursor here to update that later frag_len_cursor = req->cursor; smb_message_put16(req, 0); // Data len again (frag length) smb_message_put16(req, 0); // Auth len ? smb_message_put32(req, 12); // Call ID ? smb_message_put32(req, 64); // Alloc hint ? smb_message_put16(req, 0); // Context ID ? smb_message_put16(req, 15); // OpNum = NetShareEnumAll // Pointer to server UNC smb_message_put32(req, 0x00020000); // Referent ID ? smb_message_put32(req, strlen(s->srv.name) + 1); // Max count smb_message_put32(req, 0); // Offset smb_message_put32(req, strlen(s->srv.name) + 1); // Actual count // The server name, supposed to be downcased smb_message_put_utf16(req, s->srv.name, strlen(s->srv.name) + 1); if ((strlen(s->srv.name) % 2) == 0) // It won't be aligned with the terminating byte smb_message_put16(req, 0); smb_message_put32(req, 1); // Level 1 ? smb_message_put32(req, 1); // Ctr ? smb_message_put32(req, 0x00020004); // Referent ID ? smb_message_put64(req, 0); // Count/Null Pointer to NetShareInfo1 smb_message_put32(req, 0xffffffff); // Max Buffer (0xffffffff required by smbX) smb_message_put32(req, 0x00020008); // Referent ID ? smb_message_put32(req, 0); // Resume ? // fill trans pkt at the end since we know the size at the end SMB_MSG_INIT_PKT(trans); trans.wct = 16; trans.max_data_count = 4280; trans.setup_count = 2; trans.pipe_function = 0x26; // TransactNmPipe; trans.fid = SMB_FD_FID(srvscv_fd); trans.bct = req->cursor - sizeof(smb_trans_req); trans.data_count = trans.bct - 17; // 17 -> padding + \PIPE\ + padding trans.total_data_count = trans.data_count; trans.data_offset = 84; trans.param_offset = 84; // but insert it at the begining SMB_MSG_INSERT_PKT(req, 0, trans); req->packet->payload[frag_len_cursor] = trans.data_count; // (data_count SHOULD stay < 256) // Let's send this ugly pile of shit over the network ! res = smb_session_send_msg(s, req); smb_message_destroy(req); if (!res) { ret = DSM_ERROR_NETWORK; goto error; } // Is the server throwing pile of shit back at me ? res = smb_session_recv_msg(s, &resp); if (!res && (uint32_t)resp.packet->payload[resp.payload_size - 4]) { BDSM_dbg("NetShareEnumAll call failed.\n"); ret = DSM_ERROR_NETWORK; goto error; } //// Phase 3 // We parse the list of Share (finally !) and build function response count = smb_share_parse_enum(&resp, list); if (count == -1) { ret = DSM_ERROR_GENERIC; goto error; } if (pcount != NULL) *pcount = count; ret = DSM_SUCCESS; error: // Close the pipe smb_fclose(s, srvscv_fd); return ret; } ret = DSM_ERROR_GENERIC; }