conf.c

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/*
 * Copyright (c) 1998-2000 Sendmail, Inc. and its suppliers.
 *	All rights reserved.
 * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

#ifndef lint
static char id[] = "@(#)$Id: conf.c,v 8.646.2.2.2.32 2000/09/23 00:31:33 ca Exp $";
#endif /* ! lint */

#include <sendmail.h>
#include <sendmail/pathnames.h>

# include <sys/ioctl.h>
# include <sys/param.h>

#include <limits.h>
#if NETINET || NETINET6
# include <arpa/inet.h>
#endif /* NETINET || NETINET6 */
#if HASULIMIT && defined(HPUX11)
# include <ulimit.h>
#endif /* HASULIMIT && defined(HPUX11) */


static void	setupmaps __P((void));
static void	setupmailers __P((void));
static int	get_num_procs_online __P((void));


/*
**  CONF.C -- Sendmail Configuration Tables.
**
**	Defines the configuration of this installation.
**
**	Configuration Variables:
**		HdrInfo -- a table describing well-known header fields.
**			Each entry has the field name and some flags,
**			which are described in sendmail.h.
**
**	Notes:
**		I have tried to put almost all the reasonable
**		configuration information into the configuration
**		file read at runtime.  My intent is that anything
**		here is a function of the version of UNIX you
**		are running, or is really static -- for example
**		the headers are a superset of widely used
**		protocols.  If you find yourself playing with
**		this file too much, you may be making a mistake!
*/


/*
**  Header info table
**	Final (null) entry contains the flags used for any other field.
**
**	Not all of these are actually handled specially by sendmail
**	at this time.  They are included as placeholders, to let
**	you know that "someday" I intend to have sendmail do
**	something with them.
*/

struct hdrinfo	HdrInfo[] =
{
		/* originator fields, most to least significant */
	{ "resent-sender",		H_FROM|H_RESENT,	NULL	},
	{ "resent-from",		H_FROM|H_RESENT,	NULL	},
	{ "resent-reply-to",		H_FROM|H_RESENT,	NULL	},
	{ "sender",			H_FROM,			NULL	},
	{ "from",			H_FROM,			NULL	},
	{ "reply-to",			H_FROM,			NULL	},
	{ "errors-to",			H_FROM|H_ERRORSTO,	NULL	},
	{ "full-name",			H_ACHECK,		NULL	},
	{ "return-receipt-to",		H_RECEIPTTO,		NULL	},

		/* destination fields */
	{ "to",				H_RCPT,			NULL	},
	{ "resent-to",			H_RCPT|H_RESENT,	NULL	},
	{ "cc",				H_RCPT,			NULL	},
	{ "resent-cc",			H_RCPT|H_RESENT,	NULL	},
	{ "bcc",			H_RCPT|H_BCC,		NULL	},
	{ "resent-bcc",			H_RCPT|H_BCC|H_RESENT,	NULL	},
	{ "apparently-to",		H_RCPT,			NULL	},

		/* message identification and control */
	{ "message-id",			0,			NULL	},
	{ "resent-message-id",		H_RESENT,		NULL	},
	{ "message",			H_EOH,			NULL	},
	{ "text",			H_EOH,			NULL	},

		/* date fields */
	{ "date",			0,			NULL	},
	{ "resent-date",		H_RESENT,		NULL	},

		/* trace fields */
	{ "received",			H_TRACE|H_FORCE,	NULL	},
	{ "x400-received",		H_TRACE|H_FORCE,	NULL	},
	{ "via",			H_TRACE|H_FORCE,	NULL	},
	{ "mail-from",			H_TRACE|H_FORCE,	NULL	},

		/* miscellaneous fields */
	{ "comments",			H_FORCE|H_ENCODABLE,	NULL	},
	{ "return-path",		H_FORCE|H_ACHECK|H_BINDLATE,	NULL	},
	{ "content-transfer-encoding",	H_CTE,			NULL	},
	{ "content-type",		H_CTYPE,		NULL	},
	{ "content-length",		H_ACHECK,		NULL	},
	{ "subject",			H_ENCODABLE,		NULL	},
	{ "x-authentication-warning",	H_FORCE,		NULL	},

	{ NULL,				0,			NULL	}
};



/*
**  Privacy values
*/

struct prival PrivacyValues[] =
{
	{ "public",		PRIV_PUBLIC		},
	{ "needmailhelo",	PRIV_NEEDMAILHELO	},
	{ "needexpnhelo",	PRIV_NEEDEXPNHELO	},
	{ "needvrfyhelo",	PRIV_NEEDVRFYHELO	},
	{ "noexpn",		PRIV_NOEXPN		},
	{ "novrfy",		PRIV_NOVRFY		},
	{ "restrictmailq",	PRIV_RESTRICTMAILQ	},
	{ "restrictqrun",	PRIV_RESTRICTQRUN	},
	{ "noetrn",		PRIV_NOETRN		},
	{ "noverb",		PRIV_NOVERB		},
	{ "authwarnings",	PRIV_AUTHWARNINGS	},
	{ "noreceipts",		PRIV_NORECEIPTS		},
	{ "nobodyreturn",	PRIV_NOBODYRETN		},
	{ "goaway",		PRIV_GOAWAY		},
	{ NULL,			0			}
};

/*
**  DontBlameSendmail values
*/
struct dbsval DontBlameSendmailValues[] =
{
	{ "safe",			DBS_SAFE			},
	{ "assumesafechown",		DBS_ASSUMESAFECHOWN		},
	{ "groupwritabledirpathsafe",	DBS_GROUPWRITABLEDIRPATHSAFE	},
	{ "groupwritableforwardfilesafe",
					DBS_GROUPWRITABLEFORWARDFILESAFE },
	{ "groupwritableincludefilesafe",
					DBS_GROUPWRITABLEINCLUDEFILESAFE },
	{ "groupwritablealiasfile",	DBS_GROUPWRITABLEALIASFILE	},
	{ "worldwritablealiasfile",	DBS_WORLDWRITABLEALIASFILE	},
	{ "forwardfileinunsafedirpath",	DBS_FORWARDFILEINUNSAFEDIRPATH	},
	{ "includefileinunsafedirpath",	DBS_INCLUDEFILEINUNSAFEDIRPATH	},
	{ "mapinunsafedirpath",		DBS_MAPINUNSAFEDIRPATH	},
	{ "linkedaliasfileinwritabledir",
					DBS_LINKEDALIASFILEINWRITABLEDIR },
	{ "linkedclassfileinwritabledir",
					DBS_LINKEDCLASSFILEINWRITABLEDIR },
	{ "linkedforwardfileinwritabledir",
					DBS_LINKEDFORWARDFILEINWRITABLEDIR },
	{ "linkedincludefileinwritabledir",
					DBS_LINKEDINCLUDEFILEINWRITABLEDIR },
	{ "linkedmapinwritabledir",	DBS_LINKEDMAPINWRITABLEDIR	},
	{ "linkedserviceswitchfileinwritabledir",
					DBS_LINKEDSERVICESWITCHFILEINWRITABLEDIR },
	{ "filedeliverytohardlink",	DBS_FILEDELIVERYTOHARDLINK	},
	{ "filedeliverytosymlink",	DBS_FILEDELIVERYTOSYMLINK	},
	{ "writemaptohardlink",		DBS_WRITEMAPTOHARDLINK		},
	{ "writemaptosymlink",		DBS_WRITEMAPTOSYMLINK		},
	{ "writestatstohardlink",	DBS_WRITESTATSTOHARDLINK	},
	{ "writestatstosymlink",	DBS_WRITESTATSTOSYMLINK		},
	{ "forwardfileingroupwritabledirpath",
					DBS_FORWARDFILEINGROUPWRITABLEDIRPATH },
	{ "includefileingroupwritabledirpath",
					DBS_INCLUDEFILEINGROUPWRITABLEDIRPATH },
	{ "classfileinunsafedirpath",	DBS_CLASSFILEINUNSAFEDIRPATH	},
	{ "errorheaderinunsafedirpath",	DBS_ERRORHEADERINUNSAFEDIRPATH	},
	{ "helpfileinunsafedirpath",	DBS_HELPFILEINUNSAFEDIRPATH	},
	{ "forwardfileinunsafedirpathsafe",
					DBS_FORWARDFILEINUNSAFEDIRPATHSAFE },
	{ "includefileinunsafedirpathsafe",
					DBS_INCLUDEFILEINUNSAFEDIRPATHSAFE },
	{ "runprograminunsafedirpath",	DBS_RUNPROGRAMINUNSAFEDIRPATH	},
	{ "runwritableprogram",		DBS_RUNWRITABLEPROGRAM		},
	{ "nonrootsafeaddr",		DBS_NONROOTSAFEADDR		},
	{ "truststickybit",		DBS_TRUSTSTICKYBIT		},
	{ "dontwarnforwardfileinunsafedirpath",
					DBS_DONTWARNFORWARDFILEINUNSAFEDIRPATH },
	{ "insufficiententropy",	DBS_INSUFFICIENTENTROPY },
#if _FFR_UNSAFE_SASL
	{ "groupreadablesaslfile",	DBS_GROUPREADABLESASLFILE	},
#endif /* _FFR_UNSAFE_SASL */
#if _FFR_UNSAFE_WRITABLE_INCLUDE
	{ "groupwritableforwardfile",	DBS_GROUPWRITABLEFORWARDFILE	},
	{ "groupwritableincludefile",	DBS_GROUPWRITABLEINCLUDEFILE	},
	{ "worldwritableforwardfile",	DBS_WORLDWRITABLEFORWARDFILE	},
	{ "worldwritableincludefile",	DBS_WORLDWRITABLEINCLUDEFILE	},
#endif /* _FFR_UNSAFE_WRITABLE_INCLUDE */
	{ NULL,				0				}
};


/*
**  Miscellaneous stuff.
*/

int	DtableSize =	50;		/* max open files; reset in 4.2bsd */
/*
**  SETDEFAULTS -- set default values
**
**	Because of the way freezing is done, these must be initialized
**	using direct code.
**
**	Parameters:
**		e -- the default envelope.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Initializes a bunch of global variables to their
**		default values.
*/

#define MINUTES		* 60
#define HOURS		* 60 MINUTES
#define DAYS		* 24 HOURS

#ifndef MAXRULERECURSION
# define MAXRULERECURSION	50	/* max ruleset recursion depth */
#endif /* ! MAXRULERECURSION */

void
setdefaults(e)
	register ENVELOPE *e;
{
	int i;
	int numprocs;
	struct passwd *pw;

	numprocs = get_num_procs_online();
	SpaceSub = ' ';				/* option B */
	QueueLA = 8 * numprocs;			/* option x */
	RefuseLA = 12 * numprocs;		/* option X */
	WkRecipFact = 30000L;			/* option y */
	WkClassFact = 1800L;			/* option z */
	WkTimeFact = 90000L;			/* option Z */
	QueueFactor = WkRecipFact * 20;		/* option q */
	FileMode = (RealUid != geteuid()) ? 0644 : 0600;
						/* option F */
#if _FFR_QUEUE_FILE_MODE
	QueueFileMode = (RealUid != geteuid()) ? 0644 : 0600;
						/* option QueueFileMode */
#endif /* _FFR_QUEUE_FILE_MODE */

	if (((pw = sm_getpwnam("mailnull")) != NULL && pw->pw_uid != 0) ||
	    ((pw = sm_getpwnam("sendmail")) != NULL && pw->pw_uid != 0) ||
	    ((pw = sm_getpwnam("daemon")) != NULL && pw->pw_uid != 0))
	{
		DefUid = pw->pw_uid;		/* option u */
		DefGid = pw->pw_gid;		/* option g */
		DefUser = newstr(pw->pw_name);
	}
	else
	{
		DefUid = 1;			/* option u */
		DefGid = 1;			/* option g */
		setdefuser();
	}
	TrustedUid = 0;
	if (tTd(37, 4))
		dprintf("setdefaults: DefUser=%s, DefUid=%d, DefGid=%d\n",
			DefUser != NULL ? DefUser : "<1:1>",
			(int) DefUid, (int) DefGid);
	CheckpointInterval = 10;		/* option C */
	MaxHopCount = 25;			/* option h */
	set_delivery_mode(SM_FORK, e);		/* option d */
	e->e_errormode = EM_PRINT;		/* option e */
	e->e_queuedir = NOQDIR;
	e->e_ctime = curtime();
	SevenBitInput = FALSE;			/* option 7 */
	MaxMciCache = 1;			/* option k */
	MciCacheTimeout = 5 MINUTES;		/* option K */
	LogLevel = 9;				/* option L */
	inittimeouts(NULL, FALSE);		/* option r */
	PrivacyFlags = PRIV_PUBLIC;		/* option p */
	MeToo = TRUE;				/* option m */
	SendMIMEErrors = TRUE;			/* option f */
	SuperSafe = TRUE;			/* option s */
	clrbitmap(DontBlameSendmail);		/* DontBlameSendmail option */
#if MIME8TO7
	MimeMode = MM_CVTMIME|MM_PASS8BIT;	/* option 8 */
#else /* MIME8TO7 */
	MimeMode = MM_PASS8BIT;
#endif /* MIME8TO7 */
	for (i = 0; i < MAXTOCLASS; i++)
	{
		TimeOuts.to_q_return[i] = 5 DAYS;	/* option T */
		TimeOuts.to_q_warning[i] = 0;		/* option T */
	}
	ServiceSwitchFile = "/etc/mail/service.switch";
	ServiceCacheMaxAge = (time_t) 10;
	HostsFile = _PATH_HOSTS;
	PidFile = newstr(_PATH_SENDMAILPID);
	MustQuoteChars = "@,;:\\()[].'";
	MciInfoTimeout = 30 MINUTES;
	MaxRuleRecursion = MAXRULERECURSION;
	MaxAliasRecursion = 10;
	MaxMacroRecursion = 10;
	ColonOkInAddr = TRUE;
	DontLockReadFiles = TRUE;
	DoubleBounceAddr = "postmaster";
	MaxHeadersLength = MAXHDRSLEN;
	MaxForwardEntries = 0;
#if SASL
	AuthMechanisms = newstr(AUTH_MECHANISMS);
#endif /* SASL */
#ifdef HESIOD_INIT
	HesiodContext = NULL;
#endif /* HESIOD_INIT */
#if NETINET6
	/* Detect if IPv6 is available at run time */
	i = socket(AF_INET6, SOCK_STREAM, 0);
	if (i >= 0)
	{
		InetMode = AF_INET6;
		(void) close(i);
	}
	else
		InetMode = AF_INET;
#else /* NETINET6 */
	InetMode = AF_INET;
#endif /* NETINET6 */
	ControlSocketName = NULL;
	memset(&ConnectOnlyTo, '\0', sizeof ConnectOnlyTo);
	DataFileBufferSize = 4096;
	XscriptFileBufferSize = 4096;
	for (i = 0; i < MAXRWSETS; i++)
		RuleSetNames[i] = NULL;
#if _FFR_MILTER
	InputFilters[0] = NULL;
#endif /* _FFR_MILTER */
	setupmaps();
	setupmailers();
	setupheaders();
}


/*
**  SETDEFUSER -- set/reset DefUser using DefUid (for initgroups())
*/

void
setdefuser()
{
	struct passwd *defpwent;
	static char defuserbuf[40];

	DefUser = defuserbuf;
	defpwent = sm_getpwuid(DefUid);
	snprintf(defuserbuf, sizeof defuserbuf, "%s",
		defpwent == NULL ? "nobody" : defpwent->pw_name);
	if (tTd(37, 4))
		dprintf("setdefuser: DefUid=%d, DefUser=%s\n",
		       (int) DefUid, DefUser);
}
/*
**  SETUPMAILERS -- initialize default mailers
*/

static void
setupmailers()
{
	char buf[100];

	(void) strlcpy(buf, "prog, P=/bin/sh, F=lsoDq9, T=X-Unix/X-Unix/X-Unix, A=sh -c \201u",
		sizeof buf);
	makemailer(buf);

	(void) strlcpy(buf, "*file*, P=[FILE], F=lsDFMPEouq9, T=X-Unix/X-Unix/X-Unix, A=FILE \201u",
		sizeof buf);
	makemailer(buf);

	(void) strlcpy(buf, "*include*, P=/dev/null, F=su, A=INCLUDE \201u",
		sizeof buf);
	makemailer(buf);
	initerrmailers();
}
/*
**  SETUPMAPS -- set up map classes
*/

#define MAPDEF(name, ext, flags, parse, open, close, lookup, store) \
	{ \
		extern bool parse __P((MAP *, char *)); \
		extern bool open __P((MAP *, int)); \
		extern void close __P((MAP *)); \
		extern char *lookup __P((MAP *, char *, char **, int *)); \
		extern void store __P((MAP *, char *, char *)); \
		s = stab(name, ST_MAPCLASS, ST_ENTER); \
		s->s_mapclass.map_cname = name; \
		s->s_mapclass.map_ext = ext; \
		s->s_mapclass.map_cflags = flags; \
		s->s_mapclass.map_parse = parse; \
		s->s_mapclass.map_open = open; \
		s->s_mapclass.map_close = close; \
		s->s_mapclass.map_lookup = lookup; \
		s->s_mapclass.map_store = store; \
	}

static void
setupmaps()
{
	register STAB *s;

#ifdef NEWDB
	MAPDEF("hash", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, hash_map_open, db_map_close,
		db_map_lookup, db_map_store);

	MAPDEF("btree", ".db", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, bt_map_open, db_map_close,
		db_map_lookup, db_map_store);
#endif /* NEWDB */

#ifdef NDBM
	MAPDEF("dbm", ".dir", MCF_ALIASOK|MCF_REBUILDABLE,
		map_parseargs, ndbm_map_open, ndbm_map_close,
		ndbm_map_lookup, ndbm_map_store);
#endif /* NDBM */

#ifdef NIS
	MAPDEF("nis", NULL, MCF_ALIASOK,
		map_parseargs, nis_map_open, null_map_close,
		nis_map_lookup, null_map_store);
#endif /* NIS */

#ifdef NISPLUS
	MAPDEF("nisplus", NULL, MCF_ALIASOK,
		map_parseargs, nisplus_map_open, null_map_close,
		nisplus_map_lookup, null_map_store);
#endif /* NISPLUS */

#ifdef LDAPMAP
	MAPDEF("ldap", NULL, MCF_ALIASOK,
		ldapmap_parseargs, ldapmap_open, ldapmap_close,
		ldapmap_lookup, null_map_store);

	/* Deprecated */
	MAPDEF("ldapx", NULL, MCF_ALIASOK,
		ldapx_map_parseargs, ldapmap_open, ldapmap_close,
		ldapmap_lookup, null_map_store);
#endif /* LDAPMAP */

#ifdef PH_MAP
	MAPDEF("ph", NULL, 0,
		ph_map_parseargs, ph_map_open, ph_map_close,
		ph_map_lookup, null_map_store);
#endif /* PH_MAP */

#if MAP_NSD
	/* IRIX 6.5 nsd support */
	MAPDEF("nsd", NULL, MCF_ALIASOK,
	       map_parseargs, null_map_open, null_map_close,
	       nsd_map_lookup, null_map_store);
#endif /* MAP_NSD */

#ifdef HESIOD
	MAPDEF("hesiod", NULL, MCF_ALIASOK|MCF_ALIASONLY,
		map_parseargs, hes_map_open, null_map_close,
		hes_map_lookup, null_map_store);
#endif /* HESIOD */

#if NETINFO
	MAPDEF("netinfo", NULL, MCF_ALIASOK,
		map_parseargs, ni_map_open, null_map_close,
		ni_map_lookup, null_map_store);
#endif /* NETINFO */

#if 0
	MAPDEF("dns", NULL, 0,
		dns_map_init, null_map_open, null_map_close,
		dns_map_lookup, null_map_store);
#endif /* 0 */

#if NAMED_BIND
	/* best MX DNS lookup */
	MAPDEF("bestmx", NULL, MCF_OPTFILE,
		map_parseargs, null_map_open, null_map_close,
		bestmx_map_lookup, null_map_store);
#endif /* NAMED_BIND */

	MAPDEF("host", NULL, 0,
		host_map_init, null_map_open, null_map_close,
		host_map_lookup, null_map_store);

	MAPDEF("text", NULL, MCF_ALIASOK,
		map_parseargs, text_map_open, null_map_close,
		text_map_lookup, null_map_store);

	MAPDEF("stab", NULL, MCF_ALIASOK|MCF_ALIASONLY,
		map_parseargs, stab_map_open, null_map_close,
		stab_map_lookup, stab_map_store);

	MAPDEF("implicit", NULL, MCF_ALIASOK|MCF_ALIASONLY|MCF_REBUILDABLE,
		map_parseargs, impl_map_open, impl_map_close,
		impl_map_lookup, impl_map_store);

	/* access to system passwd file */
	MAPDEF("user", NULL, MCF_OPTFILE,
		map_parseargs, user_map_open, null_map_close,
		user_map_lookup, null_map_store);

	/* dequote map */
	MAPDEF("dequote", NULL, 0,
		dequote_init, null_map_open, null_map_close,