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env_nt.c
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C/C++ Source or Header
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1998-12-11
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17KB
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562 lines
/*
* Program: NT environment routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 1 August 1988
* Last Edited: 10 December 1998
*
* Copyright 1998 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made available
* "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
static char *myUserName = NIL; /* user name */
static char *myLocalHost = NIL; /* local host name */
static char *myClientHost = NIL;/* client host name */
static char *myServerHost = NIL;/* server host name */
static char *myHomeDir = NIL; /* home directory name */
static char *myNewsrc = NIL; /* newsrc file name */
static char *sysInbox = NIL; /* system inbox name */
static long list_max_level = 5; /* maximum level of list recursion */
/* home namespace */
static NAMESPACE nshome = {"",'\\',NIL,NIL};
/* namespace list */
static NAMESPACE *nslist[3] = {&nshome,NIL,NIL};
static long alarm_countdown = 0;/* alarm count down */
static void (*alarm_rang) (); /* alarm interrupt function */
static unsigned int rndm = 0; /* initial `random' number */
static int logtry = 3; /* number of login tries */
/* callback to get username */
static userprompt_t mailusername = NIL;
static long is_nt = -1; /* T if NT, NIL if not NT, -1 unknown */
#include "write.c" /* include safe writing routines */
/* Get all authenticators */
#include "auths.c"
/* Environment manipulate parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *env_parameters (long function,void *value)
{
switch ((int) function) {
case SET_NAMESPACE:
fatal ("SET_NAMESPACE not permitted");
case GET_NAMESPACE:
value = (void *) nslist;
break;
case SET_USERPROMPT :
mailusername = (userprompt_t) value;
break;
case GET_USERPROMPT :
value = (void *) mailusername;
break;
case SET_HOMEDIR:
if (myHomeDir) fs_give ((void **) &myHomeDir);
myHomeDir = cpystr ((char *) value);
break;
case GET_HOMEDIR:
value = (void *) myHomeDir;
break;
case SET_LOCALHOST:
myLocalHost = cpystr ((char *) value);
break;
case GET_LOCALHOST:
if (myLocalHost) fs_give ((void **) &myLocalHost);
value = (void *) myLocalHost;
break;
case SET_NEWSRC:
if (myNewsrc) fs_give ((void **) &myNewsrc);
myNewsrc = cpystr ((char *) value);
break;
case GET_NEWSRC:
if (!myNewsrc) { /* set news file name if not defined */
char tmp[MAILTMPLEN];
sprintf (tmp,"%s\\NEWSRC",myhomedir ());
myNewsrc = cpystr (tmp);
}
value = (void *) myNewsrc;
break;
case SET_SYSINBOX:
if (sysInbox) fs_give ((void **) &sysInbox);
sysInbox = cpystr ((char *) value);
break;
case GET_SYSINBOX:
value = (void *) sysInbox;
break;
case SET_LISTMAXLEVEL:
list_max_level = (long) value;
break;
case GET_LISTMAXLEVEL:
value = (void *) list_max_level;
break;
default:
value = NIL; /* error case */
break;
}
return value;
}
/* Write current time
* Accepts: destination string
* optional format of day-of-week prefix
* format of date and time
* flag whether to append symbolic timezone
*/
static void do_date (char *date,char *prefix,char *fmt,int suffix)
{
time_t tn = time (0);
struct tm *t = gmtime (&tn);
int zone = t->tm_hour * 60 + t->tm_min;
int julian = t->tm_yday;
t = localtime (&tn); /* get local time now */
/* minus UTC minutes since midnight */
zone = t->tm_hour * 60 + t->tm_min - zone;
/* julian can be one of:
* 36x local time is December 31, UTC is January 1, offset -24 hours
* 1 local time is 1 day ahead of UTC, offset +24 hours
* 0 local time is same day as UTC, no offset
* -1 local time is 1 day behind UTC, offset -24 hours
* -36x local time is January 1, UTC is December 31, offset +24 hours
*/
if (julian = t->tm_yday -julian)
zone += ((julian < 0) == (abs (julian) == 1)) ? -24*60 : 24*60;
if (prefix) { /* want day of week? */
sprintf (date,prefix,days[t->tm_wday]);
date += strlen (date); /* make next sprintf append */
}
/* output the date */
sprintf (date,fmt,t->tm_mday,months[t->tm_mon],t->tm_year+1900,
t->tm_hour,t->tm_min,t->tm_sec,zone/60,abs (zone) % 60);
if (suffix) { /* append timezone suffix if desired */
char *tz;
tzset (); /* get timezone from TZ environment stuff */
tz = tzname[daylight ? (((struct tm *) t)->tm_isdst > 0) : 0];
if (tz && tz[0]) sprintf (date + strlen (date)," (%s)",tz);
}
}
/* Write current time in RFC 822 format
* Accepts: destination string
*/
void rfc822_date (char *date)
{
do_date (date,"%s, ","%d %s %d %02d:%02d:%02d %+03d%02d",T);
}
/* Write current time in internal format
* Accepts: destination string
*/
void internal_date (char *date)
{
do_date (date,NIL,"%02d-%s-%d %02d:%02d:%02d %+03d%02d",NIL);
}
/* Return random number
*/
long random (void)
{
if (!rndm) srand (rndm = (unsigned) time (0L));
return (long) rand ();
}
/* Set alarm timer
* Accepts: new value
*/
void alarm (long seconds)
{
alarm_countdown = seconds;
}
/* The clock ticked
*/
void CALLBACK clock_ticked (UINT IDEvent,UINT uReserved,DWORD dwUser,
DWORD dwReserved1,DWORD dwReserved2)
{
if (alarm_rang && !--alarm_countdown) (*alarm_rang) ();
}
/* Initialize server
* Accepts: server name for syslog or NIL
* /etc/services service name or NIL
* alternate /etc/services service name or NIL
* SASL service name or NIL
* clock interrupt handler
* kiss-of-death interrupt handler
* hangup interrupt handler
* termination interrupt handler
*/
void server_init (char *server,char *service,char *altservice,char *sasl,
void *clkint,void *kodint,void *hupint,void *trmint)
{
if (server) { /* set server name in syslog */
openlog (server,LOG_PID,LOG_MAIL);
fclose (stderr); /* possibly save a process ID */
}
/* set SASL name */
if (sasl) mail_parameters (NIL,SET_SERVICENAME,(void *) sasl);
alarm_rang = clkint; /* note the clock interrupt */
timeBeginPeriod (1000); /* set the timer interval */
timeSetEvent (1000,1000,clock_ticked,NIL,TIME_PERIODIC);
}
/* Wait for stdin input
* Accepts: timeout in seconds
* Returns: T if have input on stdin, else NIL
*/
long server_input_wait (long seconds)
{
fd_set rfd;
struct timeval tmo;
FD_ZERO (&rfd);
FD_SET (0,&rfd);
tmo.tv_sec = seconds; tmo.tv_usec = 0;
return select (1,&rfd,0,0,&tmo) ? LONGT : NIL;
}
/* Server log in
* Accepts: user name string
* password string
* argument count
* argument vector
* Returns: T if password validated, NIL otherwise
*/
static int gotprivs = NIL; /* once-only flag to grab privileges */
long server_login (char *user,char *pass,int argc,char *argv[])
{
HANDLE hdl;
LUID tcbpriv;
TOKEN_PRIVILEGES tkp;
char *s;
if (!gotprivs++) { /* need to get privileges? */
/* yes, note client host if specified */
if (argc == 2) myClientHost = argv[1];
/* get process token and TCB priv value */
if (!(OpenProcessToken (GetCurrentProcess (),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,&hdl) &&
LookupPrivilegeValue ((LPSTR) NIL,SE_TCB_NAME,&tcbpriv)))
return NIL;
tkp.PrivilegeCount = 1; /* want to enable this privilege */
tkp.Privileges[0].Luid = tcbpriv;
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
/* enable it */
AdjustTokenPrivileges (hdl,NIL,&tkp,sizeof (TOKEN_PRIVILEGES),
(PTOKEN_PRIVILEGES) NIL,(PDWORD) NIL);
/* make sure it won */
if (GetLastError() != ERROR_SUCCESS) return NIL;
}
/* cretins still haven't given up */
if (strlen (user) >= MAILTMPLEN)
syslog (LOG_ALERT,"System break-in attempt, host=%.80s",tcp_clienthost ());
else if ((logtry > 0) && /* try to login and impersonate the guy */
((LogonUser (user,".",pass,LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,&hdl) ||
LogonUser (user,".",pass,LOGON32_LOGON_BATCH,
LOGON32_PROVIDER_DEFAULT,&hdl) ||
LogonUser (user,".",pass,LOGON32_LOGON_SERVICE,
LOGON32_PROVIDER_DEFAULT,&hdl)) &&
ImpersonateLoggedOnUser (hdl))) return env_init (user,NIL);
s = (logtry-- > 0) ? "Login failure" : "Excessive login attempts";
/* note the failure in the syslog */
syslog (LOG_INFO,"%s user=%.80s host=%.80s",s,user,tcp_clienthost ());
sleep (3); /* slow down possible cracker */
return NIL;
}
/* Authenticated server log in
* Accepts: user name string
* argument count
* argument vector
* Returns: T if password validated, NIL otherwise
*/
long authserver_login (char *user,int argc,char *argv[])
{
return server_login (user,NIL,argc,argv);
}
/* Log in as anonymous daemon
* Accepts: argument count
* argument vector
* Returns: T if successful, NIL if error
*/
long anonymous_login (int argc,char *argv[])
{
return server_login ("Guest",NIL,argc,argv);
}
/* Initialize environment
* Accepts: user name, or NIL to skip setting user name on (Win9x only)
* home directory, or NIL to use user info (NT only)
* Returns: T, always
*/
typedef NET_API_STATUS (CALLBACK *NUGI)
(LPCWSTR servername,LPCWSTR username,DWORD level,LPBYTE *bufptr);
long env_init (char *user,char *home)
{
if (myUserName) fatal ("env_init called twice!");
/* remember user name */
if (user && *user) myUserName = cpystr (user);
else if (check_nt ()) fatal ("missing user name argument to env_init!");
if (!myHomeDir) { /* only if home directory not set up yet */
/* remember home directory */
if (home && *home) myHomeDir = cpystr (home);
else if (check_nt ()) { /* get from user info on NT */
char tmp[MAILTMPLEN];
PUSER_INFO_1 ui;
NUGI nugi;
HINSTANCE nahdl = LoadLibrary ("netapi32.dll");
if (!(nahdl && (nugi = (NUGI) GetProcAddress (nahdl,"NetUserGetInfo")) &&
MultiByteToWideChar (CP_ACP,0,user,strlen (user) + 1,
(WCHAR *) tmp,MAILTMPLEN) &&
!(*nugi) (NIL,(LPWSTR) &tmp,1,(LPBYTE *) &ui) &&
WideCharToMultiByte (CP_ACP,0,ui->usri1_home_dir,-1,
tmp,MAILTMPLEN,NIL,NIL) && tmp[0]))
sprintf (tmp,"%s%s",defaultDrive (),"\\users\\default");
myHomeDir = cpystr (tmp); /* remember home directory */
}
else fatal ("missing home directory argument to env_init!");
}
return T;
}
/* Check if NT
* Returns: T if NT, NIL if Win9x
*/
int check_nt (void)
{
if (is_nt < 0) { /* not yet set up? */
OSVERSIONINFO ver;
ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
GetVersionEx (&ver);
is_nt = (ver.dwPlatformId == VER_PLATFORM_WIN32_NT) ? T : NIL;
}
return is_nt;
}
/* Return default drive
* Returns: default drive
*/
static char *defaultDrive (void)
{
char *s;
return ((s = getenv ("SystemDrive")) && *s) ? s : "C:";
}
/* Return home path from environment variables
* Accepts: path to write into
* Returns: home path, or NIL if it can't be determined (NT only)
*/
static char *homePath (char *path)
{
int i;
char *s;
/* get home drive */
strcpy (path,((s = getenv ("HOMEDRIVE")) && *s) ? s : defaultDrive ());
/* if have a home path */
if ((s = getenv ("HOMEPATH")) && (i = strlen (s))) {
if (((s[i-1] == '\\') || (s[i-1] == '/'))) s[i-1] = '\0';
strcat (path,s); /* append the home path to the drive */
}
/* return NIL if NT and no home path */
else if (check_nt ()) return NIL;
return path;
}
/* Return my user name
* Accepts: pointer to optional flags
* Returns: my user name
*/
char *myusername_full (unsigned long *flags)
{
HANDLE tok;
UCHAR tmp[MAILTMPLEN],user[MAILTMPLEN],domain[MAILTMPLEN];
DWORD len,userlen = MAILTMPLEN,domainlen = MAILTMPLEN;
SID_NAME_USE snu;
char *ret = "SYSTEM";
if (!myUserName) { /* get user name if don't have it yet */
if (check_nt ()) { /* NT lookup user and domain */
if (!(OpenProcessToken (GetCurrentProcess (),TOKEN_READ,&tok) &&
GetTokenInformation (tok,TokenUser,tmp,MAILTMPLEN,&len) &&
LookupAccountSid (NIL,((PTOKEN_USER) tmp)->User.Sid,user,
&userlen,domain,&domainlen,&snu)))
fatal ("Unable to look up user name");
/* init environment if not SYSTEM */
if (_stricmp (user,"SYSTEM")) env_init (user,homePath (tmp));
}
/* Win9x external username */
else env_init (mailusername ? (*mailusername) () : NIL,homePath (tmp));
}
if (myUserName) { /* logged in? */
if (flags) /* Guest is an anonymous user */
*flags = _stricmp (myUserName,"Guest") ? MU_LOGGEDIN : MU_ANONYMOUS;
ret = myUserName; /* return user name */
}
else if (flags) *flags = MU_NOTLOGGEDIN;
return ret;
}
/* Return my home directory name
* Returns: my home directory name
*/
char *myhomedir ()
{
if (!myHomeDir) myusername ();/* initialize if first time */
return myHomeDir ? myHomeDir : "";
}
/* Return system standard INBOX
* Accepts: buffer string
*/
char *sysinbox ()
{
char tmp[MAILTMPLEN];
if (!sysInbox) { /* initialize if first time */
if (check_nt ()) sprintf (tmp,MAILFILE,myUserName);
else sprintf (tmp,"%s\\INBOX",myhomedir ());
sysInbox = cpystr (tmp); /* system inbox is from mail spool */
}
return sysInbox;
}
/* Return mailbox file name
* Accepts: destination buffer
* mailbox name
* Returns: file name
*/
char *mailboxfile (char *dst,char *name)
{
char *dir = myhomedir ();
*dst = '\0'; /* default to empty string */
if (((name[0] == 'I') || (name[0] == 'i')) &&
((name[1] == 'N') || (name[1] == 'n')) &&
((name[2] == 'B') || (name[2] == 'b')) &&
((name[3] == 'O') || (name[3] == 'o')) &&
((name[4] == 'X') || (name[4] == 'x')) && !name[5]) name = NIL;
/* reject namespace names or names with / */
if (name && ((*name == '#') || strchr (name,'/'))) return NIL;
else if (!name) return dst; /* driver selects the INBOX name */
/* absolute path name? */
else if ((*name == '\\') || (name[1] == ':')) return strcpy (dst,name);
/* build resulting name */
sprintf (dst,"%s\\%s",dir,name);
return dst; /* return it */
}
/* Lock file name
* Accepts: return buffer for file name
* file name
* locking to be placed on file if non-NIL
* Returns: file descriptor of lock or -1 if error
*/
int lockname (char *lock,char *fname,int op)
{
int ld;
char c,*s;
if (((s = getenv ("TEMP")) && *s) || ((s = getenv ("TMPDIR")) && *s))
strcpy (lock,s);
else sprintf (lock,"%s\\TEMP\\",defaultDrive ());
if ((s = lock + strlen (lock))[-1] != '\\') *s++ ='\\';
while (c = *fname++) switch (c) {
case '/':
case '\\':
case ':':
*s++ = '!';
break;
default:
*s++ = c;
break;
}
*s++ = c;
/* get the lock */
if (((ld = open (lock,O_BINARY|O_RDWR|O_CREAT,S_IREAD|S_IWRITE)) >= 0) && op)
flock (ld,op); /* apply locking function */
return ld; /* return locking file descriptor */
}
/* Unlock file descriptor
* Accepts: file descriptor
* lock file name from lockfd()
*/
void unlockfd (int fd,char *lock)
{
flock (fd,LOCK_UN); /* unlock it */
close (fd); /* close it */
}
/* Determine default prototype stream to user
* Accepts: type (NIL for create, T for append)
* Returns: default prototype stream
*/
MAILSTREAM *default_proto (long type)
{
extern MAILSTREAM DEFAULTPROTO;
return &DEFAULTPROTO; /* return default driver's prototype */
}