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freebsd-dev/contrib/sendmail/mail.local/mail.local.c
Gregory Neil Shapiro 5b0945b570 Merge sendmail 8.16.1 to HEAD: See contrib/sendmail/RELEASE_NOTES for details 
Includes build infrastructure & config updates required for changes in 8.16.1

MFC after:	5 days
2020-07-15 18:28:54 +00:00

1960 lines
39 KiB
C
Raw Blame History

/*
* Copyright (c) 1998-2004 Proofpoint, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1990, 1993, 1994
* 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.
*
* $FreeBSD$
*
*/
#include <sm/gen.h>
SM_IDSTR(copyright,
"@(#) Copyright (c) 1998-2004 Proofpoint, Inc. and its suppliers.\n\
All rights reserved.\n\
Copyright (c) 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n")
SM_IDSTR(id, "@(#)$Id: mail.local.c,v 8.257 2013-11-22 20:51:51 ca Exp $")
#include <stdlib.h>
#include <sm/errstring.h>
#include <sm/io.h>
#include <sm/limits.h>
# include <unistd.h>
# ifdef EX_OK
# undef EX_OK /* unistd.h may have another use for this */
# endif
# define LOCKFILE_PMODE 0
#include <sm/mbdb.h>
#include <sm/sysexits.h>
#ifndef HASHSPOOL
# define HASHSPOOL 0
#endif
#ifndef HASHSPOOLMD5
# define HASHSPOOLMD5 0
#endif
/*
** This is not intended to work on System V derived systems
** such as Solaris or HP-UX, since they use a totally different
** approach to mailboxes (essentially, they have a set-group-ID program
** rather than set-user-ID, and they rely on the ability to "give away"
** files to do their work). IT IS NOT A BUG that this doesn't
** work on such architectures.
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <stdlib.h>
# include <sys/socket.h>
# include <sys/file.h>
# include <netinet/in.h>
# include <arpa/nameser.h>
# include <netdb.h>
# include <pwd.h>
#include <sm/string.h>
#include <syslog.h>
#include <ctype.h>
#include <sm/conf.h>
#include <sendmail/pathnames.h>
#if HASHSPOOL
# define HASH_NONE 0
# define HASH_USER 1
# if HASHSPOOLMD5
# define HASH_MD5 2
# include <openssl/md5.h>
# endif
#endif /* HASHSPOOL */
#if _FFR_SPOOL_PATH
/*
** Override path to mail store at run time (using -p).
** From: Eugene Grosbein of Svyaz Service JSC
** See: http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/114195
** NOTE: Update man page before adding this to a release.
*/
#endif /* _FFR_SPOOL_PATH */
#ifndef LOCKTO_RM
# define LOCKTO_RM 300 /* timeout for stale lockfile removal */
#endif
#ifndef LOCKTO_GLOB
# define LOCKTO_GLOB 400 /* global timeout for lockfile creation */
#endif
/* define a realloc() which works for NULL pointers */
#define REALLOC(ptr, size) (((ptr) == NULL) ? malloc(size) : realloc(ptr, size))
/*
** If you don't have flock, you could try using lockf instead.
*/
#ifdef LDA_USE_LOCKF
# define flock(a, b) lockf(a, b, 0)
# ifdef LOCK_EX
# undef LOCK_EX
# endif
# define LOCK_EX F_LOCK
#endif /* LDA_USE_LOCKF */
#ifndef LOCK_EX
# include <sys/file.h>
#endif
/*
** If you don't have setreuid, and you have saved uids, and you have
** a seteuid() call that doesn't try to emulate using setuid(), then
** you can try defining LDA_USE_SETEUID.
*/
#ifdef LDA_USE_SETEUID
# define setreuid(r, e) seteuid(e)
#endif
#ifdef LDA_CONTENTLENGTH
# define CONTENTLENGTH 1
#endif
#ifndef INADDRSZ
# define INADDRSZ 4 /* size of an IPv4 address in bytes */
#endif
#ifdef MAILLOCK
# include <maillock.h>
#endif
#ifndef MAILER_DAEMON
# define MAILER_DAEMON "MAILER-DAEMON"
#endif
#ifdef CONTENTLENGTH
char ContentHdr[40] = "Content-Length: ";
off_t HeaderLength;
off_t BodyLength;
#endif
bool EightBitMime = true; /* advertise 8BITMIME in LMTP */
char ErrBuf[10240]; /* error buffer */
int ExitVal = EX_OK; /* sysexits.h error value. */
bool nobiff = false;
bool nofsync = false;
bool HoldErrs = false; /* Hold errors in ErrBuf */
bool LMTPMode = false;
bool BounceQuota = false; /* permanent error when over quota */
bool CloseMBDB = false;
char *HomeMailFile = NULL; /* store mail in homedir */
#if HASHSPOOL
int HashType = HASH_NONE;
int HashDepth = 0;
bool StripRcptDomain = true;
#else
# define StripRcptDomain true
#endif
char SpoolPath[MAXPATHLEN];
char *parseaddr __P((char *, bool));
char *process_recipient __P((char *));
void dolmtp __P((void));
void deliver __P((int, char *));
int e_to_sys __P((int));
void notifybiff __P((char *));
int store __P((char *, bool *));
void usage __P((void));
int lockmbox __P((char *));
void unlockmbox __P((void));
void mailerr __P((const char *, const char *, ...));
void flush_error __P((void));
#if HASHSPOOL
const char *hashname __P((char *));
#endif
static void sm_exit __P((int));
static void
sm_exit(status)
int status;
{
if (CloseMBDB)
{
sm_mbdb_terminate();
CloseMBDB = false; /* not really necessary, but ... */
}
exit(status);
}
int
main(argc, argv)
int argc;
char *argv[];
{
struct passwd *pw;
int ch, fd;
uid_t uid;
char *from;
char *mbdbname = "pw";
int err;
extern char *optarg;
extern int optind;
/* make sure we have some open file descriptors */
for (fd = 10; fd < 30; fd++)
(void) close(fd);
/* use a reasonable umask */
(void) umask(0077);
# ifdef LOG_MAIL
openlog("mail.local", 0, LOG_MAIL);
# else
openlog("mail.local", 0);
# endif
from = NULL;
/* XXX can this be converted to a compile time check? */
if (sm_strlcpy(SpoolPath, _PATH_MAILDIR, sizeof(SpoolPath)) >=
sizeof(SpoolPath))
{
mailerr("421", "Configuration error: _PATH_MAILDIR too large");
sm_exit(EX_CONFIG);
}
#if HASHSPOOL
while ((ch = getopt(argc, argv, "7BbdD:f:h:r:lH:p:ns")) != -1)
#else /* HASHSPOOL */
# if _FFR_SPOOL_PATH
while ((ch = getopt(argc, argv, "7BbdD:f:h:r:lp:s")) != -1)
# else
while ((ch = getopt(argc, argv, "7BbdD:f:h:r:ls")) != -1)
# endif
#endif /* HASHSPOOL */
{
switch(ch)
{
case '7': /* Do not advertise 8BITMIME */
EightBitMime = false;
break;
case 'B':
nobiff = true;
break;
case 'b': /* bounce mail when over quota. */
BounceQuota = true;
break;
case 'd': /* Backward compatible. */
break;
case 'D': /* mailbox database type */
mbdbname = optarg;
break;
case 'f':
case 'r': /* Backward compatible. */
if (from != NULL)
{
mailerr(NULL, "Multiple -f options");
usage();
}
from = optarg;
break;
case 'h':
if (optarg != NULL || *optarg != '\0')
HomeMailFile = optarg;
else
{
mailerr(NULL, "-h: missing filename");
usage();
}
break;
case 'l':
LMTPMode = true;
break;
case 's':
nofsync++;
break;
#if HASHSPOOL
case 'H':
if (optarg == NULL || *optarg == '\0')
{
mailerr(NULL, "-H: missing hashinfo");
usage();
}
switch(optarg[0])
{
case 'u':
HashType = HASH_USER;
break;
# if HASHSPOOLMD5
case 'm':
HashType = HASH_MD5;
break;
# endif
default:
mailerr(NULL, "-H: unknown hash type");
usage();
}
if (optarg[1] == '\0')
{
mailerr(NULL, "-H: invalid hash depth");
usage();
}
HashDepth = atoi(&optarg[1]);
if ((HashDepth <= 0) || ((HashDepth * 2) >= MAXPATHLEN))
{
mailerr(NULL, "-H: invalid hash depth");
usage();
}
break;
case 'n':
StripRcptDomain = false;
break;
#endif /* HASHSPOOL */
#if HASHSPOOL || _FFR_SPOOL_PATH
case 'p':
if (optarg == NULL || *optarg == '\0')
{
mailerr(NULL, "-p: missing spool path");
usage();
}
if (sm_strlcpy(SpoolPath, optarg, sizeof(SpoolPath)) >=
sizeof(SpoolPath))
{
mailerr(NULL, "-p: invalid spool path");
usage();
}
break;
#endif /* HASHSPOOL || _FFR_SPOOL_PATH */
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
/* initialize biff structures */
if (!nobiff)
notifybiff(NULL);
err = sm_mbdb_initialize(mbdbname);
if (err != EX_OK)
{
char *errcode = "521";
if (err == EX_TEMPFAIL)
errcode = "421";
mailerr(errcode, "Can not open mailbox database %s: %s",
mbdbname, sm_strexit(err));
sm_exit(err);
}
CloseMBDB = true;
if (LMTPMode)
{
if (argc > 0)
{
mailerr("421", "Users should not be specified in command line if LMTP required");
sm_exit(EX_TEMPFAIL);
}
dolmtp();
/* NOTREACHED */
sm_exit(EX_OK);
}
/* Non-LMTP from here on out */
if (*argv == NULL)
usage();
/*
** If from not specified, use the name from getlogin() if the
** uid matches, otherwise, use the name from the password file
** corresponding to the uid.
*/
uid = getuid();
if (from == NULL && ((from = getlogin()) == NULL ||
(pw = getpwnam(from)) == NULL ||
pw->pw_uid != uid))
from = (pw = getpwuid(uid)) != NULL ? pw->pw_name : "???";
/*
** There is no way to distinguish the error status of one delivery
** from the rest of the deliveries. So, if we failed hard on one
** or more deliveries, but had no failures on any of the others, we
** return a hard failure. If we failed temporarily on one or more
** deliveries, we return a temporary failure regardless of the other
** failures. This results in the delivery being reattempted later
** at the expense of repeated failures and multiple deliveries.
*/
HoldErrs = true;
fd = store(from, NULL);
HoldErrs = false;
if (fd < 0)
{
flush_error();
sm_exit(ExitVal);
}
for (; *argv != NULL; ++argv)
deliver(fd, *argv);
sm_exit(ExitVal);
/* NOTREACHED */
return ExitVal;
}
char *
parseaddr(s, rcpt)
char *s;
bool rcpt;
{
char *p;
int l;
if (*s++ != '<')
return NULL;
p = s;
/* at-domain-list */
while (*p == '@')
{
p++;
while (*p != ',' && *p != ':' && *p != '\0')
p++;
if (*p == '\0')
return NULL;
/* Skip over , or : */
p++;
}
s = p;
/* local-part */
while (*p != '\0' && *p != '@' && *p != '>')
{
if (*p == '\\')
{
if (*++p == '\0')
return NULL;
}
else if (*p == '\"')
{
p++;
while (*p != '\0' && *p != '\"')
{
if (*p == '\\')
{
if (*++p == '\0')
return NULL;
}
p++;
}
if (*p == '\0' || *(p + 1) == '\0')
return NULL;
}
/* +detail ? */
if (*p == '+' && rcpt)
*p = '\0';
p++;
}
/* @domain */
if (*p == '@')
{
if (rcpt)
*p++ = '\0';
while (*p != '\0' && *p != '>')
p++;
}
if (*p != '>')
return NULL;
else
*p = '\0';
p++;
if (*p != '\0' && *p != ' ')
return NULL;
if (*s == '\0')
s = MAILER_DAEMON;
l = strlen(s) + 1;
if (l < 0)
return NULL;
p = malloc(l);
if (p == NULL)
{
mailerr("421 4.3.0", "Memory exhausted");
sm_exit(EX_TEMPFAIL);
}
(void) sm_strlcpy(p, s, l);
return p;
}
char *
process_recipient(addr)
char *addr;
{
SM_MBDB_T user;
switch (sm_mbdb_lookup(addr, &user))
{
case EX_OK:
return NULL;
case EX_NOUSER:
return "550 5.1.1 User unknown";
case EX_TEMPFAIL:
return "451 4.3.0 User database failure; retry later";
default:
return "550 5.3.0 User database failure";
}
}
#define RCPT_GROW 30
void
dolmtp()
{
char *return_path = NULL;
char **rcpt_addr = NULL;
int rcpt_num = 0;
int rcpt_alloc = 0;
bool gotlhlo = false;
char *err;
int msgfd;
char *p;
int i;
char myhostname[1024];
char buf[4096];
memset(myhostname, '\0', sizeof myhostname);
(void) gethostname(myhostname, sizeof myhostname - 1);
if (myhostname[0] == '\0')
sm_strlcpy(myhostname, "localhost", sizeof myhostname);
printf("220 %s LMTP ready\r\n", myhostname);
for (;;)
{
(void) fflush(stdout);
if (fgets(buf, sizeof(buf) - 1, stdin) == NULL)
sm_exit(EX_OK);
p = buf + strlen(buf) - 1;
if (p >= buf && *p == '\n')
*p-- = '\0';
if (p >= buf && *p == '\r')
*p-- = '\0';
switch (buf[0])
{
case 'd':
case 'D':
if (sm_strcasecmp(buf, "data") == 0)
{
bool inbody = false;
if (rcpt_num == 0)
{
mailerr("503 5.5.1", "No recipients");
continue;
}
HoldErrs = true;
msgfd = store(return_path, &inbody);
HoldErrs = false;
if (msgfd < 0 && !inbody)
{
flush_error();
continue;
}
for (i = 0; i < rcpt_num; i++)
{
if (msgfd < 0)
{
/* print error for rcpt */
flush_error();
continue;
}
p = strchr(rcpt_addr[i], '+');
if (p != NULL)
*p = '\0';
deliver(msgfd, rcpt_addr[i]);
}
if (msgfd >= 0)
(void) close(msgfd);
goto rset;
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'l':
case 'L':
if (sm_strncasecmp(buf, "lhlo ", 5) == 0)
{
/* check for duplicate per RFC 1651 4.2 */
if (gotlhlo)
{
mailerr("503", "%s Duplicate LHLO",
myhostname);
continue;
}
gotlhlo = true;
printf("250-%s\r\n", myhostname);
if (EightBitMime)
printf("250-8BITMIME\r\n");
printf("250-ENHANCEDSTATUSCODES\r\n");
printf("250 PIPELINING\r\n");
continue;
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'm':
case 'M':
if (sm_strncasecmp(buf, "mail ", 5) == 0)
{
if (return_path != NULL)
{
mailerr("503 5.5.1",
"Nested MAIL command");
continue;
}
if (sm_strncasecmp(buf + 5, "from:", 5) != 0 ||
((return_path = parseaddr(buf + 10,
false)) == NULL))
{
mailerr("501 5.5.4",
"Syntax error in parameters");
continue;
}
printf("250 2.5.0 Ok\r\n");
continue;
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'n':
case 'N':
if (sm_strcasecmp(buf, "noop") == 0)
{
printf("250 2.0.0 Ok\r\n");
continue;
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'q':
case 'Q':
if (sm_strcasecmp(buf, "quit") == 0)
{
printf("221 2.0.0 Bye\r\n");
sm_exit(EX_OK);
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'r':
case 'R':
if (sm_strncasecmp(buf, "rcpt ", 5) == 0)
{
if (return_path == NULL)
{
mailerr("503 5.5.1",
"Need MAIL command");
continue;
}
if (rcpt_num >= rcpt_alloc)
{
rcpt_alloc += RCPT_GROW;
rcpt_addr = (char **)
REALLOC((char *) rcpt_addr,
rcpt_alloc *
sizeof(char **));
if (rcpt_addr == NULL)
{
mailerr("421 4.3.0",
"Memory exhausted");
sm_exit(EX_TEMPFAIL);
}
}
if (sm_strncasecmp(buf + 5, "to:", 3) != 0 ||
((rcpt_addr[rcpt_num] = parseaddr(buf + 8,
StripRcptDomain)) == NULL))
{
mailerr("501 5.5.4",
"Syntax error in parameters");
continue;
}
err = process_recipient(rcpt_addr[rcpt_num]);
if (err != NULL)
{
mailerr(NULL, "%s", err);
continue;
}
rcpt_num++;
printf("250 2.1.5 Ok\r\n");
continue;
}
else if (sm_strcasecmp(buf, "rset") == 0)
{
printf("250 2.0.0 Ok\r\n");
rset:
while (rcpt_num > 0)
free(rcpt_addr[--rcpt_num]);
if (return_path != NULL)
free(return_path);
return_path = NULL;
continue;
}
goto syntaxerr;
/* NOTREACHED */
break;
case 'v':
case 'V':
if (sm_strncasecmp(buf, "vrfy ", 5) == 0)
{
printf("252 2.3.3 Try RCPT to attempt delivery\r\n");
continue;
}
goto syntaxerr;
/* NOTREACHED */
break;
default:
syntaxerr:
mailerr("500 5.5.2", "Syntax error");
continue;
/* NOTREACHED */
break;
}
}
}
int
store(from, inbody)
char *from;
bool *inbody;
{
FILE *fp = NULL;
time_t tval;
bool eline; /* previous line was empty */
bool fullline = true; /* current line is terminated */
bool prevfl; /* previous line was terminated */
char line[2048];
int fd;
char tmpbuf[sizeof _PATH_LOCTMP + 1];
if (inbody != NULL)
*inbody = false;
(void) umask(0077);
(void) sm_strlcpy(tmpbuf, _PATH_LOCTMP, sizeof tmpbuf);
if ((fd = mkstemp(tmpbuf)) < 0 || (fp = fdopen(fd, "w+")) == NULL)
{
if (fd >= 0)
(void) close(fd);
mailerr("451 4.3.0", "Unable to open temporary file");
return -1;
}
(void) unlink(tmpbuf);
if (LMTPMode)
{
printf("354 Go ahead\r\n");
(void) fflush(stdout);
}
if (inbody != NULL)
*inbody = true;
(void) time(&tval);
(void) fprintf(fp, "From %s %s", from, ctime(&tval));
#ifdef CONTENTLENGTH
HeaderLength = 0;
BodyLength = -1;
#endif
line[0] = '\0';
eline = true;
while (fgets(line, sizeof(line), stdin) != (char *) NULL)
{
size_t line_len = 0;
int peek;
prevfl = fullline; /* preserve state of previous line */
while (line[line_len] != '\n' && line_len < sizeof(line) - 2)
line_len++;
line_len++;
/* Check for dot-stuffing */
if (prevfl && LMTPMode && line[0] == '.')
{
if (line[1] == '\n' ||
(line[1] == '\r' && line[2] == '\n'))
goto lmtpdot;
memcpy(line, line + 1, line_len);
line_len--;
}
/* Check to see if we have the full line from fgets() */
fullline = false;
if (line_len > 0)
{
if (line[line_len - 1] == '\n')
{
if (line_len >= 2 &&
line[line_len - 2] == '\r')
{
line[line_len - 2] = '\n';
line[line_len - 1] = '\0';
line_len--;
}
fullline = true;
}
else if (line[line_len - 1] == '\r')
{
/* Did we just miss the CRLF? */
peek = fgetc(stdin);
if (peek == '\n')
{
line[line_len - 1] = '\n';
fullline = true;
}
else
(void) ungetc(peek, stdin);
}
}
else
fullline = true;
#ifdef CONTENTLENGTH
if (prevfl && line[0] == '\n' && HeaderLength == 0)
{
eline = false;
if (fp != NULL)
HeaderLength = ftell(fp);
if (HeaderLength <= 0)
{
/*
** shouldn't happen, unless ftell() is
** badly broken
*/
HeaderLength = -1;
}
}
#else /* CONTENTLENGTH */
if (prevfl && line[0] == '\n')
eline = true;
#endif /* CONTENTLENGTH */
else
{
if (eline && line[0] == 'F' &&
fp != NULL &&
!memcmp(line, "From ", 5))
(void) putc('>', fp);
eline = false;
#ifdef CONTENTLENGTH
/* discard existing "Content-Length:" headers */
if (prevfl && HeaderLength == 0 &&
(line[0] == 'C' || line[0] == 'c') &&
sm_strncasecmp(line, ContentHdr, 15) == 0)
{
/*
** be paranoid: clear the line
** so no "wrong matches" may occur later
*/
line[0] = '\0';
continue;
}
#endif /* CONTENTLENGTH */
}
if (fp != NULL)
{
(void) fwrite(line, sizeof(char), line_len, fp);
if (ferror(fp))
{
mailerr("451 4.3.0",
"Temporary file write error");
(void) fclose(fp);
fp = NULL;
continue;
}
}
}
/* check if an error occurred */
if (fp == NULL)
return -1;
if (LMTPMode)
{
/* Got a premature EOF -- toss message and exit */
sm_exit(EX_OK);
}
/* If message not newline terminated, need an extra. */
if (fp != NULL && strchr(line, '\n') == NULL)
(void) putc('\n', fp);
lmtpdot:
#ifdef CONTENTLENGTH
if (fp != NULL)
BodyLength = ftell(fp);
if (HeaderLength == 0 && BodyLength > 0) /* empty body */
{
HeaderLength = BodyLength;
BodyLength = 0;
}
else
BodyLength = BodyLength - HeaderLength - 1 ;
if (HeaderLength > 0 && BodyLength >= 0)
{
(void) sm_snprintf(line, sizeof line, "%lld\n",
(LONGLONG_T) BodyLength);
(void) sm_strlcpy(&ContentHdr[16], line,
sizeof(ContentHdr) - 16);
}
else
BodyLength = -1; /* Something is wrong here */
#endif /* CONTENTLENGTH */
/* Output a newline; note, empty messages are allowed. */
if (fp != NULL)
(void) putc('\n', fp);
if (fp == NULL || fflush(fp) == EOF || ferror(fp) != 0)
{
mailerr("451 4.3.0", "Temporary file write error");
if (fp != NULL)
(void) fclose(fp);
return -1;
}
return fd;
}
void
deliver(fd, name)
int fd;
char *name;
{
struct stat fsb;
struct stat sb;
char path[MAXPATHLEN];
int mbfd = -1, nr = 0, nw, off;
int exitval;
char *p;
char *errcode;
off_t curoff, cursize;
#ifdef CONTENTLENGTH
off_t headerbytes;
int readamount;
#endif
char biffmsg[100], buf[8 * 1024];
SM_MBDB_T user;
/*
** Disallow delivery to unknown names -- special mailboxes can be
** handled in the sendmail aliases file.
*/
exitval = sm_mbdb_lookup(name, &user);
switch (exitval)
{
case EX_OK:
break;
case EX_NOUSER:
exitval = EX_UNAVAILABLE;
mailerr("550 5.1.1", "%s: User unknown", name);
break;
case EX_TEMPFAIL:
mailerr("451 4.3.0", "%s: User database failure; retry later",
name);
break;
default:
exitval = EX_UNAVAILABLE;
mailerr("550 5.3.0", "%s: User database failure", name);
break;
}
if (exitval != EX_OK)
{
if (ExitVal != EX_TEMPFAIL)
ExitVal = exitval;
return;
}
endpwent();
/*
** Keep name reasonably short to avoid buffer overruns.
** This isn't necessary on BSD because of the proper
** definition of snprintf(), but it can cause problems
** on other systems.
** Also, clear out any bogus characters.
*/
#if !HASHSPOOL
if (strlen(name) > 40)
name[40] = '\0';
for (p = name; *p != '\0'; p++)
{
if (!isascii(*p))
*p &= 0x7f;
else if (!isprint(*p))
*p = '.';
}
#endif /* !HASHSPOOL */
if (HomeMailFile == NULL)
{
if (sm_strlcpyn(path, sizeof(path),
#if HASHSPOOL
4,
#else
3,
#endif
SpoolPath, "/",
#if HASHSPOOL
hashname(name),
#endif
name) >= sizeof(path))
{
exitval = EX_UNAVAILABLE;
mailerr("550 5.1.1", "%s: Invalid mailbox path", name);
return;
}
}
else if (*user.mbdb_homedir == '\0')
{
exitval = EX_UNAVAILABLE;
mailerr("550 5.1.1", "%s: User missing home directory", name);
return;
}
else if (sm_snprintf(path, sizeof(path), "%s/%s",
user.mbdb_homedir, HomeMailFile) >= sizeof(path))
{
exitval = EX_UNAVAILABLE;
mailerr("550 5.1.1", "%s: Invalid mailbox path", name);
return;
}
/*
** If the mailbox is linked or a symlink, fail. There's an obvious
** race here, that the file was replaced with a symbolic link after
** the lstat returned, but before the open. We attempt to detect
** this by comparing the original stat information and information
** returned by an fstat of the file descriptor returned by the open.
**
** NB: this is a symptom of a larger problem, that the mail spooling
** directory is writeable by the wrong users. If that directory is
** writeable, system security is compromised for other reasons, and
** it cannot be fixed here.
**
** If we created the mailbox, set the owner/group. If that fails,
** just return. Another process may have already opened it, so we
** can't unlink it. Historically, binmail set the owner/group at
** each mail delivery. We no longer do this, assuming that if the
** ownership or permissions were changed there was a reason.
**
** XXX
** open(2) should support flock'ing the file.
*/
tryagain:
#ifdef MAILLOCK
p = name;
#else
p = path;
#endif
if ((off = lockmbox(p)) != 0)
{
if (off == EX_TEMPFAIL || e_to_sys(off) == EX_TEMPFAIL)
{
ExitVal = EX_TEMPFAIL;
errcode = "451 4.3.0";
}
else
errcode = "551 5.3.0";
mailerr(errcode, "lockmailbox %s failed; error code %d %s",
p, off, errno > 0 ? sm_errstring(errno) : "");
return;
}
if (lstat(path, &sb) < 0)
{
int save_errno;
int mode = S_IRUSR|S_IWUSR;
gid_t gid = user.mbdb_gid;
#ifdef MAILGID
(void) umask(0007);
gid = MAILGID;
mode |= S_IRGRP|S_IWGRP;
#endif
mbfd = open(path, O_APPEND|O_CREAT|O_EXCL|O_WRONLY,
mode);
save_errno = errno;
if (lstat(path, &sb) < 0)
{
ExitVal = EX_CANTCREAT;
mailerr("550 5.2.0",
"%s: lstat: file changed after open", path);
goto err1;
}
if (mbfd < 0)
{
if (save_errno == EEXIST)
goto tryagain;
/* open failed, don't try again */
mailerr("450 4.2.0", "%s: %s", path,
sm_errstring(save_errno));
goto err0;
}
else if (fchown(mbfd, user.mbdb_uid, gid) < 0)
{
mailerr("451 4.3.0", "chown %u.%u: %s",
user.mbdb_uid, gid, name);
goto err1;
}
else
{
/*
** open() was successful, now close it so can
** be opened as the right owner again.
** Paranoia: reset mbdf since the file descriptor
** is no longer valid; better safe than sorry.
*/
sb.st_uid = user.mbdb_uid;
(void) close(mbfd);
mbfd = -1;
}
}
else if (sb.st_nlink != 1)
{
mailerr("550 5.2.0", "%s: too many links", path);
goto err0;
}
else if (!S_ISREG(sb.st_mode))
{
mailerr("550 5.2.0", "%s: irregular file", path);
goto err0;
}
else if (sb.st_uid != user.mbdb_uid)
{
ExitVal = EX_CANTCREAT;
mailerr("550 5.2.0", "%s: wrong ownership (%d)",
path, (int) sb.st_uid);
goto err0;
}
/* change UID for quota checks */
if (setreuid(0, user.mbdb_uid) < 0)
{
mailerr("450 4.2.0", "setreuid(0, %d): %s (r=%d, e=%d)",
(int) user.mbdb_uid, sm_errstring(errno),
(int) getuid(), (int) geteuid());
goto err1;
}
#ifdef DEBUG
fprintf(stderr, "new euid = %d\n", (int) geteuid());
#endif
mbfd = open(path, O_APPEND|O_WRONLY, 0);
if (mbfd < 0)
{
mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
goto err0;
}
else if (fstat(mbfd, &fsb) < 0 ||
fsb.st_nlink != 1 ||
sb.st_nlink != 1 ||
!S_ISREG(fsb.st_mode) ||
sb.st_dev != fsb.st_dev ||
sb.st_ino != fsb.st_ino ||
# if HAS_ST_GEN && 0 /* AFS returns random values for st_gen */
sb.st_gen != fsb.st_gen ||
# endif
sb.st_uid != fsb.st_uid)
{
ExitVal = EX_TEMPFAIL;
mailerr("550 5.2.0", "%s: fstat: file changed after open",
path);
goto err1;
}
#if 0
/*
** This code could be reused if we decide to add a
** per-user quota field to the sm_mbdb interface.
*/
/*
** Fail if the user has a quota specified, and delivery of this
** message would exceed that quota. We bounce such failures using
** EX_UNAVAILABLE, unless there were internal problems, since
** storing immense messages for later retries can cause queueing
** issues.
*/
if (ui.quota > 0)
{
struct stat dsb;
if (fstat(fd, &dsb) < 0)
{
ExitVal = EX_TEMPFAIL;
mailerr("451 4.3.0",
"%s: fstat: can't stat temporary storage: %s",
ui.mailspool, sm_errstring(errno));
goto err1;
}
if (dsb.st_size + sb.st_size + 1 > ui.quota)
{
ExitVal = EX_UNAVAILABLE;
mailerr("551 5.2.2",
"%s: Mailbox full or quota exceeded",
ui.mailspool);
goto err1;
}
}
#endif /* 0 */
/* Wait until we can get a lock on the file. */
if (flock(mbfd, LOCK_EX) < 0)
{
mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
goto err1;
}
/* Get the starting offset of the new message */
curoff = lseek(mbfd, (off_t) 0, SEEK_END);
if (!nobiff)
{
(void) sm_snprintf(biffmsg, sizeof(biffmsg), "%s@%lld\n",
name, (LONGLONG_T) curoff);
}
/* Copy the message into the file. */
if (lseek(fd, (off_t) 0, SEEK_SET) == (off_t) -1)
{
mailerr("450 4.2.0", "Temporary file: %s",
sm_errstring(errno));
goto err1;
}
#ifdef DEBUG
fprintf(stderr, "before writing: euid = %d\n", (int) geteuid());
#endif
#ifdef CONTENTLENGTH
headerbytes = (BodyLength >= 0) ? HeaderLength : -1 ;
for (;;)
{
if (headerbytes == 0)
{
(void) sm_snprintf(buf, sizeof buf, "%s", ContentHdr);
nr = strlen(buf);
headerbytes = -1;
readamount = 0;
}
else if (headerbytes > sizeof(buf) || headerbytes < 0)
readamount = sizeof(buf);
else
readamount = headerbytes;
if (readamount != 0)
nr = read(fd, buf, readamount);
if (nr <= 0)
break;
if (headerbytes > 0)
headerbytes -= nr ;
#else /* CONTENTLENGTH */
while ((nr = read(fd, buf, sizeof(buf))) > 0)
{
#endif /* CONTENTLENGTH */
for (off = 0; off < nr; off += nw)
{
if ((nw = write(mbfd, buf + off, nr - off)) < 0)
{
errcode = "450 4.2.0";
#ifdef EDQUOT
if (errno == EDQUOT && BounceQuota)
errcode = "552 5.2.2";
#endif
mailerr(errcode, "%s: %s",
path, sm_errstring(errno));
goto err3;
}
}
}
if (nr < 0)
{
mailerr("450 4.2.0", "Temporary file: %s",
sm_errstring(errno));
goto err3;
}
/* Flush to disk, don't wait for update. */
if (!nofsync && fsync(mbfd) < 0)
{
mailerr("450 4.2.0", "%s: %s", path, sm_errstring(errno));
err3:
#ifdef DEBUG
fprintf(stderr, "reset euid = %d\n", (int) geteuid());
#endif
if (mbfd >= 0)
(void) ftruncate(mbfd, curoff);
err1: if (mbfd >= 0)
(void) close(mbfd);
err0: (void) setreuid(0, 0);
unlockmbox();
return;
}
/*
** Save the current size so if the close() fails below
** we can make sure no other process has changed the mailbox
** between the failed close and the re-open()/re-lock().
** If something else has changed the size, we shouldn't
** try to truncate it as we may do more harm then good
** (e.g., truncate a later message delivery).
*/
if (fstat(mbfd, &sb) < 0)
cursize = 0;
else
cursize = sb.st_size;
/* Close and check -- NFS doesn't write until the close. */
if (close(mbfd))
{
errcode = "450 4.2.0";
#ifdef EDQUOT
if (errno == EDQUOT && BounceQuota)
errcode = "552 5.2.2";
#endif
mailerr(errcode, "%s: %s", path, sm_errstring(errno));
mbfd = open(path, O_WRONLY, 0);
if (mbfd < 0 ||
cursize == 0
|| flock(mbfd, LOCK_EX) < 0 ||
fstat(mbfd, &sb) < 0 ||
sb.st_size != cursize ||
sb.st_nlink != 1 ||
!S_ISREG(sb.st_mode) ||
sb.st_dev != fsb.st_dev ||
sb.st_ino != fsb.st_ino ||
# if HAS_ST_GEN && 0 /* AFS returns random values for st_gen */
sb.st_gen != fsb.st_gen ||
# endif
sb.st_uid != fsb.st_uid
)
{
/* Don't use a bogus file */
if (mbfd >= 0)
{
(void) close(mbfd);
mbfd = -1;
}
}
/* Attempt to truncate back to pre-write size */
goto err3;
}
else if (!nobiff)
notifybiff(biffmsg);
if (setreuid(0, 0) < 0)
{
mailerr("450 4.2.0", "setreuid(0, 0): %s",
sm_errstring(errno));
goto err0;
}
#ifdef DEBUG
fprintf(stderr, "reset euid = %d\n", (int) geteuid());
#endif
unlockmbox();
if (LMTPMode)
printf("250 2.1.5 %s Ok\r\n", name);
}
/*
** user.lock files are necessary for compatibility with other
** systems, e.g., when the mail spool file is NFS exported.
** Alas, mailbox locking is more than just a local matter.
** EPA 11/94.
*/
bool Locked = false;
#ifdef MAILLOCK
int
lockmbox(name)
char *name;
{
int r = 0;
if (Locked)
return 0;
if ((r = maillock(name, 15)) == L_SUCCESS)
{
Locked = true;
return 0;
}
switch (r)
{
case L_TMPLOCK: /* Can't create tmp file */
case L_TMPWRITE: /* Can't write pid into lockfile */
case L_MAXTRYS: /* Failed after retrycnt attempts */
errno = 0;
r = EX_TEMPFAIL;
break;
case L_ERROR: /* Check errno for reason */
r = errno;
break;
default: /* other permanent errors */
errno = 0;
r = EX_UNAVAILABLE;
break;
}
return r;
}
void
unlockmbox()
{
if (Locked)
mailunlock();
Locked = false;
}
#else /* MAILLOCK */
char LockName[MAXPATHLEN];
int
lockmbox(path)
char *path;
{
int statfailed = 0;
time_t start;
if (Locked)
return 0;
if (strlen(path) + 6 > sizeof LockName)
return EX_SOFTWARE;
(void) sm_snprintf(LockName, sizeof LockName, "%s.lock", path);
(void) time(&start);
for (; ; sleep(5))
{
int fd;
struct stat st;
time_t now;
/* global timeout */
(void) time(&now);
if (now > start + LOCKTO_GLOB)
{
errno = 0;
return EX_TEMPFAIL;
}
fd = open(LockName, O_WRONLY|O_EXCL|O_CREAT, LOCKFILE_PMODE);
if (fd >= 0)
{
/* defeat lock checking programs which test pid */
(void) write(fd, "0", 2);
Locked = true;
(void) close(fd);
return 0;
}
if (stat(LockName, &st) < 0)
{
if (statfailed++ > 5)
{
errno = 0;
return EX_TEMPFAIL;
}
continue;
}
statfailed = 0;
(void) time(&now);
if (now < st.st_ctime + LOCKTO_RM)
continue;
/* try to remove stale lockfile */
if (unlink(LockName) < 0)
return errno;
}
}
void
unlockmbox()
{
if (!Locked)
return;
(void) unlink(LockName);
Locked = false;
}
#endif /* MAILLOCK */
void
notifybiff(msg)
char *msg;
{
static bool initialized = false;
static int f = -1;
struct hostent *hp;
struct servent *sp;
int len;
static struct sockaddr_in addr;
if (!initialized)
{
initialized = true;
/* Be silent if biff service not available. */
if ((sp = getservbyname("biff", "udp")) == NULL ||
(hp = gethostbyname("localhost")) == NULL ||
hp->h_length != INADDRSZ)
return;
addr.sin_family = hp->h_addrtype;
memcpy(&addr.sin_addr, hp->h_addr, INADDRSZ);
addr.sin_port = sp->s_port;
}
/* No message, just return */
if (msg == NULL)
return;
/* Couldn't initialize addr struct */
if (addr.sin_family == AF_UNSPEC)
return;
if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
return;
len = strlen(msg) + 1;
(void) sendto(f, msg, len, 0, (struct sockaddr *) &addr, sizeof(addr));
}
void
usage()
{
ExitVal = EX_USAGE;
# if _FFR_SPOOL_PATH
mailerr(NULL, "usage: mail.local [-7] [-B] [-b] [-d] [-l] [-s] [-f from|-r from] [-h filename] [-p path] user ...");
# else
mailerr(NULL, "usage: mail.local [-7] [-B] [-b] [-d] [-l] [-s] [-f from|-r from] [-h filename] user ...");
# endif
sm_exit(ExitVal);
}
void
/*VARARGS2*/
#ifdef __STDC__
mailerr(const char *hdr, const char *fmt, ...)
#else /* __STDC__ */
mailerr(hdr, fmt, va_alist)
const char *hdr;
const char *fmt;
va_dcl
#endif /* __STDC__ */
{
size_t len = 0;
SM_VA_LOCAL_DECL
(void) e_to_sys(errno);
SM_VA_START(ap, fmt);
if (LMTPMode && hdr != NULL)
{
sm_snprintf(ErrBuf, sizeof ErrBuf, "%s ", hdr);
len = strlen(ErrBuf);
}
(void) sm_vsnprintf(&ErrBuf[len], sizeof ErrBuf - len, fmt, ap);
SM_VA_END(ap);
if (!HoldErrs)
flush_error();
/* Log the message to syslog. */
if (!LMTPMode)
syslog(LOG_ERR, "%s", ErrBuf);
}
void
flush_error()
{
if (LMTPMode)
printf("%s\r\n", ErrBuf);
else
{
if (ExitVal != EX_USAGE)
(void) fprintf(stderr, "mail.local: ");
fprintf(stderr, "%s\n", ErrBuf);
}
}
#if HASHSPOOL
const char *
hashname(name)
char *name;
{
static char p[MAXPATHLEN];
int i;
int len;
char *str;
# if HASHSPOOLMD5
char Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_";
MD5_CTX ctx;
unsigned char md5[18];
# if MAXPATHLEN <= 24
ERROR _MAXPATHLEN <= 24
# endif
char b64[24];
MD5_LONG bits;
int j;
# endif /* HASHSPOOLMD5 */
if (HashType == HASH_NONE || HashDepth * 2 >= MAXPATHLEN)
{
p[0] = '\0';
return p;
}
switch(HashType)
{
case HASH_USER:
str = name;
break;
# if HASHSPOOLMD5
case HASH_MD5:
MD5_Init(&ctx);
MD5_Update(&ctx, name, strlen(name));
MD5_Final(md5, &ctx);
md5[16] = 0;
md5[17] = 0;
for (i = 0; i < 6; i++)
{
bits = (unsigned) md5[(3 * i)] << 16;
bits |= (unsigned) md5[(3 * i) + 1] << 8;
bits |= (unsigned) md5[(3 * i) + 2];
for (j = 3; j >= 0; j--)
{
b64[(4 * i) + j] = Base64[(bits & 0x3f)];
bits >>= 6;
}
}
b64[22] = '\0';
str = b64;
break;
# endif /* HASHSPOOLMD5 */
}
len = strlen(str);
for (i = 0; i < HashDepth; i++)
{
if (i < len)
p[i * 2] = str[i];
else
p[i * 2] = '_';
p[(i * 2) + 1] = '/';
}
p[HashDepth * 2] = '\0';
return p;
}
#endif /* HASHSPOOL */
/*
* e_to_sys --
* Guess which errno's are temporary. Gag me.
*/
int
e_to_sys(num)
int num;
{
/* Temporary failures override hard errors. */
if (ExitVal == EX_TEMPFAIL)
return ExitVal;
switch (num) /* Hopefully temporary errors. */
{
#ifdef EDQUOT
case EDQUOT: /* Disc quota exceeded */
if (BounceQuota)
{
ExitVal = EX_UNAVAILABLE;
break;
}
/* FALLTHROUGH */
#endif /* EDQUOT */
#ifdef EAGAIN
case EAGAIN: /* Resource temporarily unavailable */
#endif
#ifdef EBUSY
case EBUSY: /* Device busy */
#endif
#ifdef EPROCLIM
case EPROCLIM: /* Too many processes */
#endif
#ifdef EUSERS
case EUSERS: /* Too many users */
#endif
#ifdef ECONNABORTED
case ECONNABORTED: /* Software caused connection abort */
#endif
#ifdef ECONNREFUSED
case ECONNREFUSED: /* Connection refused */
#endif
#ifdef ECONNRESET
case ECONNRESET: /* Connection reset by peer */
#endif
#ifdef EDEADLK
case EDEADLK: /* Resource deadlock avoided */
#endif
#ifdef EFBIG
case EFBIG: /* File too large */
#endif
#ifdef EHOSTDOWN
case EHOSTDOWN: /* Host is down */
#endif
#ifdef EHOSTUNREACH
case EHOSTUNREACH: /* No route to host */
#endif
#ifdef EMFILE
case EMFILE: /* Too many open files */
#endif
#ifdef ENETDOWN
case ENETDOWN: /* Network is down */
#endif
#ifdef ENETRESET
case ENETRESET: /* Network dropped connection on reset */
#endif
#ifdef ENETUNREACH
case ENETUNREACH: /* Network is unreachable */
#endif
#ifdef ENFILE
case ENFILE: /* Too many open files in system */
#endif
#ifdef ENOBUFS
case ENOBUFS: /* No buffer space available */
#endif
#ifdef ENOMEM
case ENOMEM: /* Cannot allocate memory */
#endif
#ifdef ENOSPC
case ENOSPC: /* No space left on device */
#endif
#ifdef EROFS
case EROFS: /* Read-only file system */
#endif
#ifdef ESTALE
case ESTALE: /* Stale NFS file handle */
#endif
#ifdef ETIMEDOUT
case ETIMEDOUT: /* Connection timed out */
#endif
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN && EWOULDBLOCK != EDEADLK
case EWOULDBLOCK: /* Operation would block. */
#endif
ExitVal = EX_TEMPFAIL;
break;
default:
ExitVal = EX_UNAVAILABLE;
break;
}
return ExitVal;
}
#if defined(ultrix) || defined(_CRAY)
/*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
# if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
# endif
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <errno.h>
# include <stdio.h>
# include <ctype.h>
static int _gettemp();
mkstemp(path)
char *path;
{
int fd;
return (_gettemp(path, &fd) ? fd : -1);
}
static
_gettemp(path, doopen)
char *path;
register int *doopen;
{
extern int errno;
register char *start, *trv;
struct stat sbuf;
unsigned int pid;
pid = getpid();
for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
while (*--trv == 'X')
{
*trv = (pid % 10) + '0';
pid /= 10;
}
/*
* check the target directory; if you have six X's and it
* doesn't exist this runs for a *very* long time.
*/
for (start = trv + 1;; --trv)
{
if (trv <= path)
break;
if (*trv == '/')
{
*trv = '\0';
if (stat(path, &sbuf) < 0)
return(0);
if (!S_ISDIR(sbuf.st_mode))
{
errno = ENOTDIR;
return(0);
}
*trv = '/';
break;
}
}
for (;;)
{
if (doopen)
{
if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR,
0600)) >= 0)
return(1);
if (errno != EEXIST)
return(0);
}
else if (stat(path, &sbuf) < 0)
return(errno == ENOENT ? 1 : 0);
/* tricky little algorithm for backward compatibility */
for (trv = start;;)
{
if (!*trv)
return(0);
if (*trv == 'z')
*trv++ = 'a';
else
{
if (isascii(*trv) && isdigit(*trv))
*trv = 'a';
else
++*trv;
break;
}
}
}
/* NOTREACHED */
}
#endif /* defined(ultrix) || defined(_CRAY) */
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