diff options
Diffstat (limited to 'source3/smbd/negprot.c')
| -rw-r--r-- | source3/smbd/negprot.c | 509 |
1 files changed, 509 insertions, 0 deletions
diff --git a/source3/smbd/negprot.c b/source3/smbd/negprot.c new file mode 100644 index 0000000000..18682e6c9f --- /dev/null +++ b/source3/smbd/negprot.c @@ -0,0 +1,509 @@ +/* + 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" + +extern int Protocol; +extern int max_recv; +extern fstring global_myworkgroup; +extern fstring remote_machine; +BOOL global_encrypted_passwords_negotiated = False; +BOOL global_spnego_negotiated = False; +struct auth_context *negprot_global_auth_context = NULL; + +static void get_challenge(char buff[8]) +{ + NTSTATUS nt_status; + const uint8 *cryptkey; + + /* We might be called more than once, muliple negprots are premitted */ + if (negprot_global_auth_context) { + DEBUG(3, ("get challenge: is this a secondary negprot? negprot_global_auth_context is non-NULL!\n")); + (negprot_global_auth_context->free)(&negprot_global_auth_context); + } + + DEBUG(10, ("get challenge: creating negprot_global_auth_context\n")); + if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&negprot_global_auth_context))) { + DEBUG(0, ("make_auth_context_subsystem returned %s", nt_errstr(nt_status))); + smb_panic("cannot make_negprot_global_auth_context!\n"); + } + DEBUG(10, ("get challenge: getting challenge\n")); + cryptkey = negprot_global_auth_context->get_ntlm_challenge(negprot_global_auth_context); + memcpy(buff, cryptkey, 8); +} + +/**************************************************************************** +reply for the core protocol +****************************************************************************/ +static int reply_corep(char *inbuf, char *outbuf) +{ + int outsize = set_message(outbuf,1,0,True); + + Protocol = PROTOCOL_CORE; + + return outsize; +} + + +/**************************************************************************** +reply for the coreplus protocol +****************************************************************************/ +static int reply_coreplus(char *inbuf, char *outbuf) +{ + int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + int outsize = set_message(outbuf,13,0,True); + SSVAL(outbuf,smb_vwv5,raw); /* tell redirector we support + readbraw and writebraw (possibly) */ + /* Reply, SMBlockread, SMBwritelock supported. */ + SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD); + SSVAL(outbuf,smb_vwv1,0x1); /* user level security, don't encrypt */ + + Protocol = PROTOCOL_COREPLUS; + + return outsize; +} + + +/**************************************************************************** +reply for the lanman 1.0 protocol +****************************************************************************/ +static int reply_lanman1(char *inbuf, char *outbuf) +{ + int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + int secword=0; + time_t t = time(NULL); + + global_encrypted_passwords_negotiated = lp_encrypted_passwords(); + + if (lp_security()>=SEC_USER) secword |= 1; + if (global_encrypted_passwords_negotiated) secword |= 2; + + set_message(outbuf,13,global_encrypted_passwords_negotiated?8:0,True); + SSVAL(outbuf,smb_vwv1,secword); + /* Create a token value and add it to the outgoing packet. */ + if (global_encrypted_passwords_negotiated) { + get_challenge(smb_buf(outbuf)); + } + + Protocol = PROTOCOL_LANMAN1; + + /* Reply, SMBlockread, SMBwritelock supported. */ + SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD); + SSVAL(outbuf,smb_vwv2,max_recv); + SSVAL(outbuf,smb_vwv3,lp_maxmux()); /* maxmux */ + SSVAL(outbuf,smb_vwv4,1); + SSVAL(outbuf,smb_vwv5,raw); /* tell redirector we support + readbraw writebraw (possibly) */ + SIVAL(outbuf,smb_vwv6,sys_getpid()); + SSVAL(outbuf,smb_vwv10, TimeDiff(t)/60); + + put_dos_date(outbuf,smb_vwv8,t); + + return (smb_len(outbuf)+4); +} + + +/**************************************************************************** +reply for the lanman 2.0 protocol +****************************************************************************/ +static int reply_lanman2(char *inbuf, char *outbuf) +{ + int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0); + int secword=0; + time_t t = time(NULL); + + global_encrypted_passwords_negotiated = lp_encrypted_passwords(); + + if (lp_security()>=SEC_USER) secword |= 1; + if (global_encrypted_passwords_negotiated) secword |= 2; + + set_message(outbuf,13,global_encrypted_passwords_negotiated?8:0,True); + SSVAL(outbuf,smb_vwv1,secword); + SIVAL(outbuf,smb_vwv6,sys_getpid()); + + /* Create a token value and add it to the outgoing packet. */ + if (global_encrypted_passwords_negotiated) { + get_challenge(smb_buf(outbuf)); + } + + Protocol = PROTOCOL_LANMAN2; + + /* Reply, SMBlockread, SMBwritelock supported. */ + SCVAL(outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD); + SSVAL(outbuf,smb_vwv2,max_recv); + SSVAL(outbuf,smb_vwv3,lp_maxmux()); + SSVAL(outbuf,smb_vwv4,1); + SSVAL(outbuf,smb_vwv5,raw); /* readbraw and/or writebraw */ + SSVAL(outbuf,smb_vwv10, TimeDiff(t)/60); + put_dos_date(outbuf,smb_vwv8,t); + + return (smb_len(outbuf)+4); +} + + + +/* + generate the spnego negprot reply blob. Return the number of bytes used +*/ +static int negprot_spnego(char *p) +{ + DATA_BLOB blob; + extern pstring global_myname; + uint8 guid[16]; + const char *OIDs_krb5[] = {OID_NTLMSSP, + OID_KERBEROS5, + OID_KERBEROS5_OLD, + NULL}; + const char *OIDs_plain[] = {OID_NTLMSSP, NULL}; + char *principal; + int len; + + global_spnego_negotiated = True; + + memset(guid, 0, 16); + safe_strcpy((char *)guid, global_myname, 16); + strlower((char *)guid); + +#if 0 + /* strangely enough, NT does not sent the single OID NTLMSSP when + not a ADS member, it sends no OIDs at all + + we can't do this until we teach our sesssion setup parser to know + about raw NTLMSSP (clients send no ASN.1 wrapping if we do this) + */ + if (lp_security() != SEC_ADS) { + memcpy(p, guid, 16); + return 16; + } +#endif + if (lp_security() != SEC_ADS) { + blob = spnego_gen_negTokenInit(guid, OIDs_plain, "NONE"); + } else { + ADS_STRUCT *ads; + ads = ads_init(NULL, NULL, NULL, NULL); + /* win2000 uses host$@REALM, which we will probably use eventually, + but for now this works */ + asprintf(&principal, "HOST/%s@%s", guid, ads->realm); + blob = spnego_gen_negTokenInit(guid, OIDs_krb5, principal); + free(principal); + ads_destroy(&ads); + } + memcpy(p, blob.data, blob.length); + len = blob.length; + data_blob_free(&blob); + return len; +} + + + +/**************************************************************************** +reply for the nt protocol +****************************************************************************/ +static int reply_nt1(char *inbuf, char *outbuf) +{ + /* dual names + lock_and_read + nt SMBs + remote API calls */ + int capabilities = CAP_NT_FIND|CAP_LOCK_AND_READ| + CAP_LEVEL_II_OPLOCKS; + + int secword=0; + time_t t = time(NULL); + char *p, *q; + BOOL negotiate_spnego = False; + + global_encrypted_passwords_negotiated = lp_encrypted_passwords(); + + /* do spnego in user level security if the client + supports it and we can do encrypted passwords */ + + if (global_encrypted_passwords_negotiated && + (lp_security() != SEC_SHARE) && + lp_use_spnego() && + (SVAL(inbuf, smb_flg2) & FLAGS2_EXTENDED_SECURITY)) { + negotiate_spnego = True; + capabilities |= CAP_EXTENDED_SECURITY; + } + + capabilities |= CAP_NT_SMBS|CAP_RPC_REMOTE_APIS|CAP_UNIX; + + if (lp_large_readwrite() && (SMB_OFF_T_BITS == 64)) + capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX|CAP_W2K_SMBS; + + if (SMB_OFF_T_BITS == 64) + 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_USER) + secword |= 1; + if (global_encrypted_passwords_negotiated) + secword |= 2; + + set_message(outbuf,17,0,True); + + SCVAL(outbuf,smb_vwv1,secword); + + Protocol = PROTOCOL_NT1; + + SSVAL(outbuf,smb_vwv1+1,lp_maxmux()); /* maxmpx */ + SSVAL(outbuf,smb_vwv2+1,1); /* num vcs */ + SIVAL(outbuf,smb_vwv3+1,0xffff); /* max buffer. LOTS! */ + SIVAL(outbuf,smb_vwv5+1,0x10000); /* raw size. full 64k */ + SIVAL(outbuf,smb_vwv7+1,sys_getpid()); /* session key */ + SIVAL(outbuf,smb_vwv9+1,capabilities); /* capabilities */ + put_long_date(outbuf+smb_vwv11+1,t); + SSVALS(outbuf,smb_vwv15+1,TimeDiff(t)/60); + + p = q = smb_buf(outbuf); + if (!negotiate_spnego) { + /* Create a token value and add it to the outgoing packet. */ + if (global_encrypted_passwords_negotiated) { + get_challenge(p); + } + SSVALS(outbuf,smb_vwv16+1,8); + p += 8; + p += srvstr_push(outbuf, p, global_myworkgroup, -1, + STR_UNICODE|STR_TERMINATE|STR_NOALIGN); + DEBUG(3,("not using SPNEGO\n")); + } else { + int len = negprot_spnego(p); + + SSVALS(outbuf,smb_vwv16+1,len); + p += len; + DEBUG(3,("using SPNEGO\n")); + } + + SSVAL(outbuf,smb_vwv17, p - q); /* length of challenge+domain strings */ + set_message_end(outbuf, p); + + return (smb_len(outbuf)+4); +} + +/* these are the protocol lists used for auto architecture detection: + +WinNT 3.51: +protocol [PC NETWORK PROGRAM 1.0] +protocol [XENIX CORE] +protocol [MICROSOFT NETWORKS 1.03] +protocol [LANMAN1.0] +protocol [Windows for Workgroups 3.1a] +protocol [LM1.2X002] +protocol [LANMAN2.1] +protocol [NT LM 0.12] + +Win95: +protocol [PC NETWORK PROGRAM 1.0] +protocol [XENIX CORE] +protocol [MICROSOFT NETWORKS 1.03] +protocol [LANMAN1.0] +protocol [Windows for Workgroups 3.1a] +protocol [LM1.2X002] +protocol [LANMAN2.1] +protocol [NT LM 0.12] + +Win2K: +protocol [PC NETWORK PROGRAM 1.0] +protocol [LANMAN1.0] +protocol [Windows for Workgroups 3.1a] +protocol [LM1.2X002] +protocol [LANMAN2.1] +protocol [NT LM 0.12] + +OS/2: +protocol [PC NETWORK PROGRAM 1.0] +protocol [XENIX CORE] +protocol [LANMAN1.0] +protocol [LM1.2X002] +protocol [LANMAN2.1] +*/ + +/* + * Modified to recognize the architecture of the remote machine better. + * + * This appears to be the matrix of which protocol is used by which + * MS product. + Protocol WfWg Win95 WinNT Win2K OS/2 + PC NETWORK PROGRAM 1.0 1 1 1 1 1 + XENIX CORE 2 2 + MICROSOFT NETWORKS 3.0 2 2 + DOS LM1.2X002 3 3 + MICROSOFT NETWORKS 1.03 3 + DOS LANMAN2.1 4 4 + LANMAN1.0 4 2 3 + Windows for Workgroups 3.1a 5 5 5 3 + LM1.2X002 6 4 4 + LANMAN2.1 7 5 5 + NT LM 0.12 6 8 6 + * + * tim@fsg.com 09/29/95 + * Win2K added by matty 17/7/99 + */ + +#define ARCH_WFWG 0x3 /* This is a fudge because WfWg is like Win95 */ +#define ARCH_WIN95 0x2 +#define ARCH_WINNT 0x4 +#define ARCH_WIN2K 0xC /* Win2K is like NT */ +#define ARCH_OS2 0x14 /* Again OS/2 is like NT */ +#define ARCH_SAMBA 0x20 + +#define ARCH_ALL 0x3F + +/* List of supported protocols, most desired first */ +static struct { + char *proto_name; + char *short_name; + int (*proto_reply_fn)(char *, char *); + int protocol_level; +} supported_protocols[] = { + {"NT LANMAN 1.0", "NT1", reply_nt1, PROTOCOL_NT1}, + {"NT LM 0.12", "NT1", reply_nt1, PROTOCOL_NT1}, + {"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 +****************************************************************************/ +int reply_negprot(connection_struct *conn, + char *inbuf,char *outbuf, int dum_size, + int dum_buffsize) +{ + int outsize = set_message(outbuf,1,0,True); + int Index=0; + int choice= -1; + int protocol; + char *p; + int bcc = SVAL(smb_buf(inbuf),-2); + int arch = ARCH_ALL; + START_PROFILE(SMBnegprot); + + p = smb_buf(inbuf)+1; + while (p < (smb_buf(inbuf) + bcc)) + { + Index++; + DEBUG(3,("Requested protocol [%s]\n",p)); + if (strcsequal(p,"Windows for Workgroups 3.1a")) + arch &= ( ARCH_WFWG | ARCH_WIN95 | ARCH_WINNT | ARCH_WIN2K ); + else if (strcsequal(p,"DOS LM1.2X002")) + arch &= ( ARCH_WFWG | ARCH_WIN95 ); + else if (strcsequal(p,"DOS LANMAN2.1")) + arch &= ( ARCH_WFWG | ARCH_WIN95 ); + else if (strcsequal(p,"NT LM 0.12")) + arch &= ( ARCH_WIN95 | ARCH_WINNT | ARCH_WIN2K ); + else if (strcsequal(p,"LANMAN2.1")) + arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 ); + else if (strcsequal(p,"LM1.2X002")) + arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 ); + else if (strcsequal(p,"MICROSOFT NETWORKS 1.03")) + arch &= ARCH_WINNT; + else if (strcsequal(p,"XENIX CORE")) + arch &= ( ARCH_WINNT | ARCH_OS2 ); + else if (strcsequal(p,"Samba")) { + arch = ARCH_SAMBA; + break; + } + + p += strlen(p) + 2; + } + + switch ( arch ) { + case ARCH_SAMBA: + set_remote_arch(RA_SAMBA); + break; + case ARCH_WFWG: + set_remote_arch(RA_WFWG); + break; + case ARCH_WIN95: + set_remote_arch(RA_WIN95); + break; + case ARCH_WINNT: + if(SVAL(inbuf,smb_flg2)==FLAGS2_WIN2K_SIGNATURE) + set_remote_arch(RA_WIN2K); + else + set_remote_arch(RA_WINNT); + break; + case ARCH_WIN2K: + set_remote_arch(RA_WIN2K); + break; + case ARCH_OS2: + set_remote_arch(RA_OS2); + break; + default: + set_remote_arch(RA_UNKNOWN); + break; + } + + /* possibly reload - change of architecture */ + reload_services(True); + + /* Check for protocols, most desirable first */ + for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) + { + p = smb_buf(inbuf)+1; + Index = 0; + if ((supported_protocols[protocol].protocol_level <= lp_maxprotocol()) && + (supported_protocols[protocol].protocol_level >= lp_minprotocol())) + while (p < (smb_buf(inbuf) + bcc)) + { + if (strequal(p,supported_protocols[protocol].proto_name)) + choice = Index; + Index++; + p += strlen(p) + 2; + } + if(choice != -1) + break; + } + + SSVAL(outbuf,smb_vwv0,choice); + if(choice != -1) { + extern fstring remote_proto; + fstrcpy(remote_proto,supported_protocols[protocol].short_name); + reload_services(True); + outsize = supported_protocols[protocol].proto_reply_fn(inbuf, outbuf); + DEBUG(3,("Selected protocol %s\n",supported_protocols[protocol].proto_name)); + } + else { + DEBUG(0,("No protocol supported !\n")); + } + SSVAL(outbuf,smb_vwv0,choice); + + DEBUG( 5, ( "negprot index=%d\n", choice ) ); + + END_PROFILE(SMBnegprot); + return(outsize); +} + |