From 6d34ab056f70d85c3207696fac4fbb9e7f437b14 Mon Sep 17 00:00:00 2001 From: Stefan Metzmacher Date: Fri, 18 Nov 2005 13:30:18 +0000 Subject: r11786: move all SMB protocol specific stuff to smb_server/smb/ metze (This used to be commit 5fea278cb65076cea71bb6c921e51c4feffc37d7) --- source4/smb_server/smb/negprot.c | 472 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 472 insertions(+) create mode 100644 source4/smb_server/smb/negprot.c (limited to 'source4/smb_server/smb/negprot.c') diff --git a/source4/smb_server/smb/negprot.c b/source4/smb_server/smb/negprot.c new file mode 100644 index 0000000000..a9cc05e251 --- /dev/null +++ b/source4/smb_server/smb/negprot.c @@ -0,0 +1,472 @@ +/* + Unix SMB/CIFS implementation. + negprot reply code + Copyright (C) Andrew Tridgell 1992-1998 + + 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 2 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, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "auth/auth.h" +#include "smb_server/smb_server.h" +#include "smbd/service_stream.h" + + +/* initialise the auth_context for this server and return the cryptkey */ +static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8]) +{ + NTSTATUS nt_status; + const uint8_t *challenge; + + /* muliple negprots are not premitted */ + if (smb_conn->negotiate.auth_context) { + DEBUG(3,("get challenge: is this a secondary negprot? auth_context is non-NULL!\n")); + return NT_STATUS_FOOBAR; + } + + DEBUG(10, ("get challenge: creating negprot_global_auth_context\n")); + + nt_status = auth_context_create(smb_conn, lp_auth_methods(), + &smb_conn->negotiate.auth_context, + smb_conn->connection->event.ctx); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status))); + return nt_status; + } + + nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status))); + return nt_status; + } + + memcpy(buff, challenge, 8); + + return NT_STATUS_OK; +} + +/**************************************************************************** + Reply for the core protocol. +****************************************************************************/ +static void reply_corep(struct smbsrv_request *req, uint16_t choice) +{ + req_setup_reply(req, 1, 0); + + SSVAL(req->out.vwv, VWV(0), choice); + + req->smb_conn->negotiate.protocol = PROTOCOL_CORE; + + if (req->smb_conn->signing.mandatory_signing) { + smbsrv_terminate_connection(req->smb_conn, + "CORE does not support SMB signing, and it is mandatory\n"); + return; + } + + req_send_reply(req); +} + +/**************************************************************************** + Reply for the coreplus protocol. +this is quite incomplete - we only fill in a small part of the reply, but as nobody uses +this any more it probably doesn't matter +****************************************************************************/ +static void reply_coreplus(struct smbsrv_request *req, uint16_t choice) +{ + uint16_t raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + + req_setup_reply(req, 13, 0); + + /* Reply, SMBlockread, SMBwritelock supported. */ + SCVAL(req->out.hdr,HDR_FLG, + CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD); + + SSVAL(req->out.vwv, VWV(0), choice); + SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */ + + /* tell redirector we support + readbraw and writebraw (possibly) */ + SSVAL(req->out.vwv, VWV(5), raw); + + req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS; + + if (req->smb_conn->signing.mandatory_signing) { + smbsrv_terminate_connection(req->smb_conn, + "COREPLUS does not support SMB signing, and it is mandatory\n"); + return; + } + + req_send_reply(req); +} + +/**************************************************************************** + Reply for the lanman 1.0 protocol. +****************************************************************************/ +static void reply_lanman1(struct smbsrv_request *req, uint16_t choice) +{ + int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + int secword=0; + time_t t = req->request_time.tv_sec; + + req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(); + + if (lp_security() != SEC_SHARE) + secword |= NEGOTIATE_SECURITY_USER_LEVEL; + + if (req->smb_conn->negotiate.encrypted_passwords) + secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE; + + req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1; + + req_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0); + + /* SMBlockread, SMBwritelock supported. */ + SCVAL(req->out.hdr,HDR_FLG, + CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD); + + SSVAL(req->out.vwv, VWV(0), choice); + SSVAL(req->out.vwv, VWV(1), secword); + SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv); + SSVAL(req->out.vwv, VWV(3), lp_maxmux()); + SSVAL(req->out.vwv, VWV(4), 1); + SSVAL(req->out.vwv, VWV(5), raw); + SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id); + srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t); + SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60); + SIVAL(req->out.vwv, VWV(11), 0); /* reserved */ + + /* Create a token value and add it to the outgoing packet. */ + if (req->smb_conn->negotiate.encrypted_passwords) { + NTSTATUS nt_status; + + SSVAL(req->out.vwv, VWV(11), 8); + + nt_status = get_challenge(req->smb_conn, req->out.data); + if (!NT_STATUS_IS_OK(nt_status)) { + smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n"); + return; + } + } + + if (req->smb_conn->signing.mandatory_signing) { + smbsrv_terminate_connection(req->smb_conn, + "LANMAN1 does not support SMB signing, and it is mandatory\n"); + return; + } + + req_send_reply(req); +} + +/**************************************************************************** + Reply for the lanman 2.0 protocol. +****************************************************************************/ +static void reply_lanman2(struct smbsrv_request *req, uint16_t choice) +{ + int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + int secword=0; + time_t t = req->request_time.tv_sec; + + req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(); + + if (lp_security() != SEC_SHARE) + secword |= NEGOTIATE_SECURITY_USER_LEVEL; + + if (req->smb_conn->negotiate.encrypted_passwords) + secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE; + + req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2; + + req_setup_reply(req, 13, 0); + + SSVAL(req->out.vwv, VWV(0), choice); + SSVAL(req->out.vwv, VWV(1), secword); + SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv); + SSVAL(req->out.vwv, VWV(3), lp_maxmux()); + SSVAL(req->out.vwv, VWV(4), 1); + SSVAL(req->out.vwv, VWV(5), raw); + SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id); + srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t); + SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60); + SIVAL(req->out.vwv, VWV(11), 0); + + /* Create a token value and add it to the outgoing packet. */ + if (req->smb_conn->negotiate.encrypted_passwords) { + SSVAL(req->out.vwv, VWV(11), 8); + req_grow_data(req, 8); + get_challenge(req->smb_conn, req->out.data); + } + + req_push_str(req, NULL, lp_workgroup(), -1, STR_TERMINATE); + + if (req->smb_conn->signing.mandatory_signing) { + smbsrv_terminate_connection(req->smb_conn, + "LANMAN2 does not support SMB signing, and it is mandatory\n"); + return; + } + + req_send_reply(req); +} + +/**************************************************************************** + Reply for the nt protocol. +****************************************************************************/ +static void reply_nt1(struct smbsrv_request *req, uint16_t choice) +{ + /* dual names + lock_and_read + nt SMBs + remote API calls */ + int capabilities; + int secword=0; + time_t t = req->request_time.tv_sec; + NTTIME nttime; + BOOL negotiate_spnego = False; + + unix_to_nt_time(&nttime, t); + + capabilities = + CAP_NT_FIND | CAP_LOCK_AND_READ | + CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS; + + req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(); + + /* do spnego in user level security if the client + supports it and we can do encrypted passwords */ + + if (req->smb_conn->negotiate.encrypted_passwords && + (lp_security() != SEC_SHARE) && + lp_use_spnego() && + (req->flags2 & FLAGS2_EXTENDED_SECURITY)) { + negotiate_spnego = True; + capabilities |= CAP_EXTENDED_SECURITY; + } + + if (lp_unix_extensions()) { + capabilities |= CAP_UNIX; + } + + if (lp_large_readwrite()) { + capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS; + } + + capabilities |= CAP_LARGE_FILES; + + if (lp_readraw() && lp_writeraw()) { + capabilities |= CAP_RAW_MODE; + } + + /* allow for disabling unicode */ + if (lp_unicode()) { + capabilities |= CAP_UNICODE; + } + + if (lp_nt_status_support()) { + capabilities |= CAP_STATUS32; + } + + if (lp_host_msdfs()) { + capabilities |= CAP_DFS; + } + + if (lp_security() != SEC_SHARE) { + secword |= NEGOTIATE_SECURITY_USER_LEVEL; + } + + if (req->smb_conn->negotiate.encrypted_passwords) { + secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE; + } + + if (req->smb_conn->signing.allow_smb_signing) { + secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED; + } + + if (req->smb_conn->signing.mandatory_signing) { + secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED; + } + + req->smb_conn->negotiate.protocol = PROTOCOL_NT1; + + req_setup_reply(req, 17, 0); + + SSVAL(req->out.vwv, VWV(0), choice); + SCVAL(req->out.vwv, VWV(1), secword); + + /* notice the strange +1 on vwv here? That's because + this is the one and only SMB packet that is malformed in + the specification - all the command words after the secword + are offset by 1 byte */ + SSVAL(req->out.vwv+1, VWV(1), lp_maxmux()); + SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */ + SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv); + SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */ + SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id); /* session key */ + SIVAL(req->out.vwv+1, VWV(9), capabilities); + push_nttime(req->out.vwv+1, VWV(11), nttime); + SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60); + + if (!negotiate_spnego) { + /* Create a token value and add it to the outgoing packet. */ + if (req->smb_conn->negotiate.encrypted_passwords) { + req_grow_data(req, 8); + /* note that we do not send a challenge at all if + we are using plaintext */ + get_challenge(req->smb_conn, req->out.ptr); + req->out.ptr += 8; + SCVAL(req->out.vwv+1, VWV(16), 8); + } + req_push_str(req, NULL, lp_workgroup(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN); + req_push_str(req, NULL, lp_netbios_name(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN); + DEBUG(3,("not using SPNEGO\n")); + } else { + struct cli_credentials *server_credentials; + struct gensec_security *gensec_security; + DATA_BLOB null_data_blob = data_blob(NULL, 0); + DATA_BLOB blob; + NTSTATUS nt_status = gensec_server_start(req->smb_conn, + &gensec_security, + req->smb_conn->connection->event.ctx); + + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status))); + smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n"); + return; + } + + if (req->smb_conn->negotiate.auth_context) { + smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot? auth_context is non-NULL!\n"); + return; + } + + server_credentials + = cli_credentials_init(req); + if (!server_credentials) { + smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n"); + return; + } + + cli_credentials_set_conf(server_credentials); + nt_status = cli_credentials_set_machine_account(server_credentials); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status))); + talloc_free(server_credentials); + server_credentials = NULL; + } + + req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials); + + gensec_set_target_service(gensec_security, "cifs"); + + gensec_set_credentials(gensec_security, server_credentials); + + nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO); + + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status))); + smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n"); + return; + } + + nt_status = gensec_update(gensec_security, req, null_data_blob, &blob); + + if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { + DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status))); + smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n"); + return; + } + + req->smb_conn->negotiate.spnego_negotiated = True; + + req_grow_data(req, blob.length + 16); + /* a NOT very random guid */ + memset(req->out.ptr, '\0', 16); + req->out.ptr += 16; + + memcpy(req->out.ptr, blob.data, blob.length); + SCVAL(req->out.vwv+1, VWV(16), blob.length + 16); + req->out.ptr += blob.length; + DEBUG(3,("using SPNEGO\n")); + } + + req_send_reply_nosign(req); +} + + +/* List of supported protocols, most desired first */ +static const struct { + const char *proto_name; + const char *short_name; + void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice); + int protocol_level; +} supported_protocols[] = { + {"NT LANMAN 1.0", "NT1", reply_nt1, PROTOCOL_NT1}, + {"NT LM 0.12", "NT1", reply_nt1, PROTOCOL_NT1}, + {"LANMAN2.1", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2}, + {"LM1.2X002", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2}, + {"Samba", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2}, + {"DOS LM1.2X002", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2}, + {"LANMAN1.0", "LANMAN1", reply_lanman1, PROTOCOL_LANMAN1}, + {"MICROSOFT NETWORKS 3.0", "LANMAN1", reply_lanman1, PROTOCOL_LANMAN1}, + {"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus, PROTOCOL_COREPLUS}, + {"PC NETWORK PROGRAM 1.0", "CORE", reply_corep, PROTOCOL_CORE}, + {NULL,NULL,NULL,0}, +}; + +/**************************************************************************** + Reply to a negprot. +****************************************************************************/ + +void reply_negprot(struct smbsrv_request *req) +{ + int Index=0; + int choice = -1; + int protocol; + uint8_t *p; + + if (req->smb_conn->negotiate.done_negprot) { + smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted"); + return; + } + req->smb_conn->negotiate.done_negprot = True; + + p = req->in.data + 1; + + while (p < req->in.data + req->in.data_size) { + Index++; + DEBUG(3,("Requested protocol [%s]\n",(const char *)p)); + p += strlen((const char *)p) + 2; + } + + /* Check for protocols, most desirable first */ + for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) { + p = req->in.data+1; + Index = 0; + if ((supported_protocols[protocol].protocol_level <= lp_maxprotocol()) && + (supported_protocols[protocol].protocol_level >= lp_minprotocol())) + while (p < (req->in.data + req->in.data_size)) { + if (strequal((const char *)p,supported_protocols[protocol].proto_name)) + choice = Index; + Index++; + p += strlen((const char *)p) + 2; + } + if(choice != -1) + break; + } + + if(choice != -1) { + sub_set_remote_proto(supported_protocols[protocol].short_name); + supported_protocols[protocol].proto_reply_fn(req, choice); + DEBUG(3,("Selected protocol %s\n",supported_protocols[protocol].proto_name)); + } else { + DEBUG(0,("No protocol supported !\n")); + } + + DEBUG(5,("negprot index=%d\n", choice)); +} -- cgit