r11786: move all SMB protocol specific stuff to smb_server/smb/

metze
(This used to be commit 5fea278cb65076cea71bb6c921e51c4feffc37d7)

1 files changed, 472 insertions, 0 deletions

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));
+}