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-rw-r--r--source3/smbd/service.c542
1 files changed, 542 insertions, 0 deletions
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
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+++ b/source3/smbd/service.c
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+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ service (connection) opening and closing
+ 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 DEBUGLEVEL;
+
+extern time_t smb_last_time;
+extern int case_default;
+extern BOOL case_preserve;
+extern BOOL short_case_preserve;
+extern BOOL case_mangle;
+extern BOOL case_sensitive;
+extern BOOL use_mangled_map;
+extern fstring remote_machine;
+extern pstring sesssetup_user;
+extern fstring remote_machine;
+
+
+/****************************************************************************
+load parameters specific to a connection/service
+****************************************************************************/
+BOOL become_service(connection_struct *conn,BOOL do_chdir)
+{
+ extern char magic_char;
+ static connection_struct *last_conn;
+ int snum;
+
+ if (!conn) {
+ last_conn = NULL;
+ return(False);
+ }
+
+ conn->lastused = smb_last_time;
+
+ snum = SNUM(conn);
+
+ if (do_chdir &&
+ ChDir(conn->connectpath) != 0 &&
+ ChDir(conn->origpath) != 0) {
+ DEBUG(0,("chdir (%s) failed\n",
+ conn->connectpath));
+ return(False);
+ }
+
+ if (conn == last_conn)
+ return(True);
+
+ last_conn = conn;
+
+ case_default = lp_defaultcase(snum);
+ case_preserve = lp_preservecase(snum);
+ short_case_preserve = lp_shortpreservecase(snum);
+ case_mangle = lp_casemangle(snum);
+ case_sensitive = lp_casesensitive(snum);
+ magic_char = lp_magicchar(snum);
+ use_mangled_map = (*lp_mangled_map(snum) ? True:False);
+ return(True);
+}
+
+
+/****************************************************************************
+ find a service entry
+****************************************************************************/
+int find_service(char *service)
+{
+ int iService;
+
+ string_sub(service,"\\","/");
+
+ iService = lp_servicenumber(service);
+
+ /* now handle the special case of a home directory */
+ if (iService < 0)
+ {
+ char *phome_dir = get_home_dir(service);
+
+ if(!phome_dir)
+ {
+ /*
+ * Try mapping the servicename, it may
+ * be a Windows to unix mapped user name.
+ */
+ if(map_username(service))
+ phome_dir = get_home_dir(service);
+ }
+
+ DEBUG(3,("checking for home directory %s gave %s\n",service,
+ phome_dir?phome_dir:"(NULL)"));
+
+ if (phome_dir)
+ {
+ int iHomeService;
+ if ((iHomeService = lp_servicenumber(HOMES_NAME)) >= 0)
+ {
+ lp_add_home(service,iHomeService,phome_dir);
+ iService = lp_servicenumber(service);
+ }
+ }
+ }
+
+ /* If we still don't have a service, attempt to add it as a printer. */
+ if (iService < 0)
+ {
+ int iPrinterService;
+
+ if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0)
+ {
+ char *pszTemp;
+
+ DEBUG(3,("checking whether %s is a valid printer name...\n", service));
+ pszTemp = PRINTCAP;
+ if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp))
+ {
+ DEBUG(3,("%s is a valid printer name\n", service));
+ DEBUG(3,("adding %s as a printer service\n", service));
+ lp_add_printer(service,iPrinterService);
+ iService = lp_servicenumber(service);
+ if (iService < 0)
+ DEBUG(0,("failed to add %s as a printer service!\n", service));
+ }
+ else
+ DEBUG(3,("%s is not a valid printer name\n", service));
+ }
+ }
+
+ /* just possibly it's a default service? */
+ if (iService < 0)
+ {
+ char *pdefservice = lp_defaultservice();
+ if (pdefservice && *pdefservice && !strequal(pdefservice,service))
+ {
+ /*
+ * We need to do a local copy here as lp_defaultservice()
+ * returns one of the rotating lp_string buffers that
+ * could get overwritten by the recursive find_service() call
+ * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
+ */
+ pstring defservice;
+ pstrcpy(defservice, pdefservice);
+ iService = find_service(defservice);
+ if (iService >= 0)
+ {
+ string_sub(service,"_","/");
+ iService = lp_add_service(service,iService);
+ }
+ }
+ }
+
+ if (iService >= 0)
+ if (!VALID_SNUM(iService))
+ {
+ DEBUG(0,("Invalid snum %d for %s\n",iService,service));
+ iService = -1;
+ }
+
+ if (iService < 0)
+ DEBUG(3,("find_service() failed to find service %s\n", service));
+
+ return (iService);
+}
+
+
+/****************************************************************************
+ make a connection to a service
+****************************************************************************/
+connection_struct *make_connection(char *service,char *user,char *password, int pwlen, char *dev,uint16 vuid, int *ecode)
+{
+ int snum;
+ struct passwd *pass = NULL;
+ BOOL guest = False;
+ BOOL force = False;
+ extern int Client;
+ connection_struct *conn;
+
+ strlower(service);
+
+ snum = find_service(service);
+ if (snum < 0) {
+ extern int Client;
+ if (strequal(service,"IPC$")) {
+ DEBUG(3,("refusing IPC connection\n"));
+ *ecode = ERRnoipc;
+ return NULL;
+ }
+
+ DEBUG(0,("%s (%s) couldn't find service %s\n",
+ remote_machine, client_addr(Client), service));
+ *ecode = ERRinvnetname;
+ return NULL;
+ }
+
+ if (strequal(service,HOMES_NAME)) {
+ if (*user && Get_Pwnam(user,True))
+ return(make_connection(user,user,password,
+ pwlen,dev,vuid,ecode));
+
+ if(lp_security() != SEC_SHARE) {
+ if (validated_username(vuid)) {
+ pstrcpy(user,validated_username(vuid));
+ return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
+ }
+ } else {
+ /* Security = share. Try with sesssetup_user
+ * as the username. */
+ if(*sesssetup_user) {
+ pstrcpy(user,sesssetup_user);
+ return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
+ }
+ }
+ }
+
+ if (!lp_snum_ok(snum) ||
+ !check_access(Client,
+ lp_hostsallow(snum), lp_hostsdeny(snum))) {
+ *ecode = ERRaccess;
+ return NULL;
+ }
+
+ /* you can only connect to the IPC$ service as an ipc device */
+ if (strequal(service,"IPC$"))
+ pstrcpy(dev,"IPC");
+
+ if (*dev == '?' || !*dev) {
+ if (lp_print_ok(snum)) {
+ pstrcpy(dev,"LPT1:");
+ } else {
+ pstrcpy(dev,"A:");
+ }
+ }
+
+ /* if the request is as a printer and you can't print then refuse */
+ strupper(dev);
+ if (!lp_print_ok(snum) && (strncmp(dev,"LPT",3) == 0)) {
+ DEBUG(1,("Attempt to connect to non-printer as a printer\n"));
+ *ecode = ERRinvdevice;
+ return NULL;
+ }
+
+ /* lowercase the user name */
+ strlower(user);
+
+ /* add it as a possible user name */
+ add_session_user(service);
+
+ /* shall we let them in? */
+ if (!authorise_login(snum,user,password,pwlen,&guest,&force,vuid)) {
+ DEBUG( 2, ( "Invalid username/password for %s\n", service ) );
+ *ecode = ERRbadpw;
+ return NULL;
+ }
+
+ conn = conn_new();
+ if (!conn) {
+ DEBUG(0,("Couldn't find free connection.\n"));
+ *ecode = ERRnoresource;
+ conn_free(conn);
+ return NULL;
+ }
+
+ /* find out some info about the user */
+ pass = Get_Pwnam(user,True);
+
+ if (pass == NULL) {
+ DEBUG(0,( "Couldn't find account %s\n",user));
+ *ecode = ERRbaduid;
+ conn_free(conn);
+ return NULL;
+ }
+
+ conn->read_only = lp_readonly(snum);
+
+ {
+ pstring list;
+ StrnCpy(list,lp_readlist(snum),sizeof(pstring)-1);
+ string_sub(list,"%S",service);
+
+ if (user_in_list(user,list))
+ conn->read_only = True;
+
+ StrnCpy(list,lp_writelist(snum),sizeof(pstring)-1);
+ string_sub(list,"%S",service);
+
+ if (user_in_list(user,list))
+ conn->read_only = False;
+ }
+
+ /* admin user check */
+
+ /* JRA - original code denied admin user if the share was
+ marked read_only. Changed as I don't think this is needed,
+ but old code left in case there is a problem here.
+ */
+ if (user_in_list(user,lp_admin_users(snum))
+#if 0
+ && !conn->read_only
+#endif
+ ) {
+ conn->admin_user = True;
+ DEBUG(0,("%s logged in as admin user (root privileges)\n",user));
+ } else {
+ conn->admin_user = False;
+ }
+
+ conn->force_user = force;
+ conn->vuid = vuid;
+ conn->uid = pass->pw_uid;
+ conn->gid = pass->pw_gid;
+ conn->num_files_open = 0;
+ conn->lastused = time(NULL);
+ conn->service = snum;
+ conn->used = True;
+ conn->printer = (strncmp(dev,"LPT",3) == 0);
+ conn->ipc = (strncmp(dev,"IPC",3) == 0);
+ conn->dirptr = NULL;
+ conn->veto_list = NULL;
+ conn->hide_list = NULL;
+ conn->veto_oplock_list = NULL;
+ string_set(&conn->dirpath,"");
+ string_set(&conn->user,user);
+
+#ifdef HAVE_GETGRNAM
+ if (*lp_force_group(snum)) {
+ struct group *gptr;
+ pstring gname;
+
+ StrnCpy(gname,lp_force_group(snum),sizeof(pstring)-1);
+ /* default service may be a group name */
+ string_sub(gname,"%S",service);
+ gptr = (struct group *)getgrnam(gname);
+
+ if (gptr) {
+ conn->gid = gptr->gr_gid;
+ DEBUG(3,("Forced group %s\n",gname));
+ } else {
+ DEBUG(1,("Couldn't find group %s\n",gname));
+ }
+ }
+#endif
+
+ if (*lp_force_user(snum)) {
+ struct passwd *pass2;
+ fstring fuser;
+ fstrcpy(fuser,lp_force_user(snum));
+ pass2 = (struct passwd *)Get_Pwnam(fuser,True);
+ if (pass2) {
+ conn->uid = pass2->pw_uid;
+ string_set(&conn->user,fuser);
+ fstrcpy(user,fuser);
+ conn->force_user = True;
+ DEBUG(3,("Forced user %s\n",fuser));
+ } else {
+ DEBUG(1,("Couldn't find user %s\n",fuser));
+ }
+ }
+
+ {
+ pstring s;
+ pstrcpy(s,lp_pathname(snum));
+ standard_sub(conn,s);
+ string_set(&conn->connectpath,s);
+ DEBUG(3,("Connect path is %s\n",s));
+ }
+
+ /* groups stuff added by ih */
+ conn->ngroups = 0;
+ conn->groups = NULL;
+
+ if (!IS_IPC(conn)) {
+ /* Find all the groups this uid is in and
+ store them. Used by become_user() */
+ setup_groups(conn->user,conn->uid,conn->gid,
+ &conn->ngroups,&conn->groups);
+
+ /* check number of connections */
+ if (!claim_connection(conn,
+ lp_servicename(SNUM(conn)),
+ lp_max_connections(SNUM(conn)),
+ False)) {
+ DEBUG(1,("too many connections - rejected\n"));
+ *ecode = ERRnoresource;
+ conn_free(conn);
+ return NULL;
+ }
+
+ if (lp_status(SNUM(conn)))
+ claim_connection(conn,"STATUS.",
+ MAXSTATUS,False);
+ } /* IS_IPC */
+
+ /* execute any "root preexec = " line */
+ if (*lp_rootpreexec(SNUM(conn))) {
+ pstring cmd;
+ pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
+ standard_sub(conn,cmd);
+ DEBUG(5,("cmd=%s\n",cmd));
+ smbrun(cmd,NULL,False);
+ }
+
+ if (!become_user(conn, conn->vuid)) {
+ DEBUG(0,("Can't become connected user!\n"));
+ if (!IS_IPC(conn)) {
+ yield_connection(conn,
+ lp_servicename(SNUM(conn)),
+ lp_max_connections(SNUM(conn)));
+ if (lp_status(SNUM(conn))) {
+ yield_connection(conn,"STATUS.",MAXSTATUS);
+ }
+ }
+ conn_free(conn);
+ *ecode = ERRbadpw;
+ return NULL;
+ }
+
+ if (ChDir(conn->connectpath) != 0) {
+ DEBUG(0,("Can't change directory to %s (%s)\n",
+ conn->connectpath,strerror(errno)));
+ unbecome_user();
+ if (!IS_IPC(conn)) {
+ yield_connection(conn,
+ lp_servicename(SNUM(conn)),
+ lp_max_connections(SNUM(conn)));
+ if (lp_status(SNUM(conn)))
+ yield_connection(conn,"STATUS.",MAXSTATUS);
+ }
+ conn_free(conn);
+ *ecode = ERRinvnetname;
+ return NULL;
+ }
+
+ string_set(&conn->origpath,conn->connectpath);
+
+#if SOFTLINK_OPTIMISATION
+ /* resolve any soft links early */
+ {
+ pstring s;
+ pstrcpy(s,conn->connectpath);
+ GetWd(s);
+ string_set(&conn->connectpath,s);
+ ChDir(conn->connectpath);
+ }
+#endif
+
+ add_session_user(user);
+
+ /* execute any "preexec = " line */
+ if (*lp_preexec(SNUM(conn))) {
+ pstring cmd;
+ pstrcpy(cmd,lp_preexec(SNUM(conn)));
+ standard_sub(conn,cmd);
+ smbrun(cmd,NULL,False);
+ }
+
+ /* we've finished with the sensitive stuff */
+ unbecome_user();
+
+ /* Add veto/hide lists */
+ if (!IS_IPC(conn) && !IS_PRINT(conn)) {
+ set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
+ set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
+ set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
+ }
+
+ if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
+ extern int Client;
+
+ dbgtext( "%s (%s) ", remote_machine, client_addr(Client) );
+ dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
+ dbgtext( "as user %s ", user );
+ dbgtext( "(uid=%d, gid=%d) ", conn->uid, conn->gid );
+ dbgtext( "(pid %d)\n", (int)getpid() );
+ }
+
+ return(conn);
+}
+
+
+/****************************************************************************
+close a cnum
+****************************************************************************/
+void close_cnum(connection_struct *conn, uint16 vuid)
+{
+ extern int Client;
+ DirCacheFlush(SNUM(conn));
+
+ unbecome_user();
+
+ DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
+ remote_machine,client_addr(Client),
+ lp_servicename(SNUM(conn))));
+
+ yield_connection(conn,
+ lp_servicename(SNUM(conn)),
+ lp_max_connections(SNUM(conn)));
+
+ if (lp_status(SNUM(conn)))
+ yield_connection(conn,"STATUS.",MAXSTATUS);
+
+ file_close_conn(conn);
+ dptr_closecnum(conn);
+
+ /* execute any "postexec = " line */
+ if (*lp_postexec(SNUM(conn)) &&
+ become_user(conn, vuid)) {
+ pstring cmd;
+ pstrcpy(cmd,lp_postexec(SNUM(conn)));
+ standard_sub(conn,cmd);
+ smbrun(cmd,NULL,False);
+ unbecome_user();
+ }
+
+ unbecome_user();
+ /* execute any "root postexec = " line */
+ if (*lp_rootpostexec(SNUM(conn))) {
+ pstring cmd;
+ pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
+ standard_sub(conn,cmd);
+ smbrun(cmd,NULL,False);
+ }
+
+ conn_free(conn);
+}
+
+
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