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mimedefang.c
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mimedefang.c
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/***********************************************************************
*
* mimedefang.c
*
* C interface to the attachment-filter program for stripping or altering
* MIME attachments in incoming Sendmail connections.
*
* Copyright (C) 2000-2005 Roaring Penguin Software Inc.
* http://www.roaringpenguin.com
*
* This program may be distributed under the terms of the GNU General
* Public License, Version 2, or (at your option) any later version.
*
* This program was derived from the sample mail filter included in
* libmilter/README in the Sendmail 8.11 distribution.
***********************************************************************/
#define _DEFAULT_SOURCE 1
#define MAX_ML_LINES 31
#ifdef HAVE_SOCKLEN_T
typedef socklen_t md_socklen_t;
#else
typedef int md_socklen_t;
#endif
#include "config.h"
#include "mimedefang.h"
#include "dynbuf.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <pthread.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <pwd.h>
#include <stdio.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "libmilter/mfapi.h"
#include "milter_cap.h"
#include <sys/socket.h>
#include <sys/un.h>
/* Solaris does not define AF_LOCAL */
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
#endif
#ifdef ENABLE_DEBUGGING
#include <signal.h>
#define DEBUG(x) x
extern void *malloc_debug(void *, size_t, char const *fname, int);
extern char *strdup_debug(void *, char const *, char const *, int);
extern void free_debug(void *, void *, char const *, int);
#undef malloc
#undef strdup
#undef free
#define malloc_with_log(x) malloc_debug(ctx, x, __FILE__, __LINE__)
#define strdup_with_log(x) strdup_debug(ctx, x, __FILE__, __LINE__)
#define malloc(x) malloc_debug(ctx, x, __FILE__, __LINE__)
#define strdup(x) strdup_debug(ctx, x, __FILE__, __LINE__)
#define free(x) free_debug(ctx, x, __FILE__, __LINE__)
#else
#define DEBUG(x) (void) 0
#endif
/* If we don't have inet_ntop, we need to protect inet_ntoa with a mutex */
#ifndef HAVE_INET_NTOP
static pthread_mutex_t ntoa_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
extern int find_syslog_facility(char const *facility_name);
#define DEBUG_ENTER(func) DEBUG(syslog(LOG_DEBUG, "%p: %s(%d): ENTER %s", ctx, __FILE__, __LINE__, func))
#define DEBUG_EXIT(func, ret) DEBUG(syslog(LOG_DEBUG, "%p: %s(%d): EXIT %s: %s", ctx, __FILE__, __LINE__, func, ret))
#define SCAN_BODY "MIMEDefang " VERSION
/* Call a Milter smfi_xxxx function, but syslog if it doesn't return
* MI_SUCCESS */
#define MD_SMFI_TRY(func, args) do { if (func args != MI_SUCCESS) syslog(LOG_WARNING, "%s: %s returned MI_FAILURE", data->qid, #func); } while (0)
char *scan_body = NULL;
static char *pidfile = NULL;
static char *lockfile = NULL;
#define KEY_FILE CONFDIR "/mimedefang-ip-key"
/* In debug mode, we do not delete working directories. */
int DebugMode = 0;
/* Conserve file descriptors by reopening files in each callback */
int ConserveDescriptors = 0;
/* Log "eom" run-times */
int LogTimes = 0;
/* Show me rejected recipients?
(Sendmail 8.14.0 and higher only */
int SeeRejectedRecipients = 1;
/* Default Backlog for "listen" */
static int Backlog = -1;
/* Strip out bare CR characters? */
static int StripBareCR = 0;
/* Allow new connections to queue? */
static int AllowNewConnectionsToQueue = 0;
/* Is it OK to call smfi_setsymlist? */
static int setsymlist_ok = 0;
/* Run as this user */
static char *user = NULL;
extern int drop_privs(char const *user, uid_t uid, gid_t gid);
/* NOQUEUE */
static char *NOQUEUE = "NOQUEUE";
/* My IP address */
static char *MyIPAddress = NULL;
/* "Equivalent-to-loopback" address */
static char *EquivToLoopback = NULL;
/* Header name for validating IP addresses */
static char ValidateHeader[256];
/* Additional Sendmail macros to pass along */
/* Note that libmilter has a hard limit of 50
and we include 20 in StandardSendmailMacros */
#define MAX_ADDITIONAL_SENDMAIL_MACROS 30
/* Standard Sendmail macros */
/* We can't make it char const * because libmilter
is not const-correct. */
static char *StandardSendmailMacros[] = {
"_", "auth_authen", "auth_author", "auth_ssf", "auth_type",
"cert_issuer", "cert_subject", "cipher", "cipher_bits", "daemon_name",
"daemon_port",
"i", "if_addr", "if_name", "j", "mail_addr", "mail_host", "mail_mailer",
"tls_version", "verify", "rcpt_addr", "rcpt_host", "rcpt_mailer",
/* End of macros MUST be marked with NULL! */
NULL
};
static char *AdditionalMacros[MAX_ADDITIONAL_SENDMAIL_MACROS];
static int NumAdditionalMacros = 0;
/* Keep track of private data -- file name and fp for writing e-mail body */
struct privdata {
char *hostname; /* Name of connecting host */
char *hostip; /* IP address of connecting host */
unsigned int hostport; /* Port of connecting host */
char *myip; /* My IP address, from Sendmail macro */
unsigned int daemon_port; /* Daemon port from Sendmail macro */
char *sender; /* Envelope sender */
char *firstRecip; /* Address of first recipient */
char *dir; /* Work directory */
char *heloArg; /* HELO argument */
char *qid; /* Queue ID */
unsigned char qid_written; /* Have we written qid to COMMANDS? */
int fd; /* File for message body */
int headerFD; /* File for message headers */
int cmdFD; /* File for commands */
int numContentTypeHeaders; /* How many Content-Type headers have we seen? */
int seenMimeVersionHeader; /* True if there was a MIME-Version header */
unsigned char validatePresent; /* Saw a relay-address validation header */
unsigned char suspiciousBody; /* Suspicious characters in message body? */
unsigned char lastWasCR; /* Last char of body chunk was CR? */
unsigned char filterFailed; /* Filter failed */
};
static void append_macro_value(dynamic_buffer *dbuf,
SMFICTX *ctx,
char *macro);
static void append_mx_command(dynamic_buffer *dbuf,
char cmd,
char const *buf);
static int write_dbuf(dynamic_buffer *dbuf,
int fd,
struct privdata *data,
char const *filename);
static void append_percent_encoded(dynamic_buffer *dbuf,
char const *buf);
static int safe_append_header(dynamic_buffer *dbuf,
char *str);
static sfsistat cleanup(SMFICTX *ctx);
static sfsistat mfclose(SMFICTX *ctx);
static int do_sm_quarantine(SMFICTX *ctx, char const *reason);
static void remove_working_directory(SMFICTX *ctx, struct privdata *data);
static char const *SpoolDir = NULL;
static char const *NoDeleteDir = NULL;
static char const *MultiplexorSocketName = NULL;
static int set_reply(SMFICTX *ctx, char const *first, char const *code, char const *dsn, char const *reply);
#define DATA ((struct privdata *) smfi_getpriv(ctx))
/* Size of chunk when replacing body */
#define CHUNK 4096
/* Number of file descriptors to close when forking */
#define CLOSEFDS 256
/* Do relay check? */
static int doRelayCheck = 0;
/* Do HELO check? */
static int doHeloCheck = 0;
/* Do sender check? */
static int doSenderCheck = 0;
/* Do recipient check? */
static int doRecipientCheck = 0;
/* Keep directories around if multiplexor fails? */
static int keepFailedDirectories = 0;
/* Number of scanning workers reserved for connection from loopback */
static int workersReservedForLoopback = -1;
static void set_dsn(SMFICTX *ctx, char *buf2, int code);
#define NO_DELETE_NAME "/DO-NOT-DELETE-WORK-DIRS"
#ifdef ENABLE_DEBUGGING
/**********************************************************************
*%FUNCTION: handle_sig
*%ARGUMENTS:
* s -- signal number
*%RETURNS:
* Nothing
*%DESCRIPTION:
* Handler for SIGSEGV and SIGBUS -- logs a message and returns -- hopefully,
* we'll get a nice core dump the second time around
***********************************************************************/
static void
handle_sig(int s)
{
syslog(LOG_ERR, "WHOA, NELLY! Caught signal %d -- this is bad news. Core dump at 11.", s);
/* Default is terminate and core. */
signal(s, SIG_DFL);
/* Return and probably cause core dump */
}
#endif
/**********************************************************************
* %FUNCTION: get_fd
* %ARGUMENTS:
* data -- our struct privdata
* fname -- filename to open for writing. Relative to work directory
* sample_fd -- the "sample" fd from "data", if we're not conserving.
* %RETURNS:
* A file descriptor open for writing, or -1 on failure
* %DESCRIPTION:
* If we are NOT conserving file descriptors, simply returns sample_fd.
* If we ARE conserving file descriptors, opens fname for writing.
***********************************************************************/
static int
get_fd(struct privdata *data,
char const *fname,
int sample_fd)
{
char buf[SMALLBUF];
if (sample_fd >= 0 && !ConserveDescriptors) return sample_fd;
snprintf(buf, SMALLBUF, "%s/%s", data->dir, fname);
sample_fd = open(buf, O_CREAT|O_APPEND|O_RDWR, 0640);
if (sample_fd < 0) {
syslog(LOG_WARNING, "%s: Could not open %s/%s: %m",
data->qid, data->dir, fname);
}
return sample_fd;
}
/**********************************************************************
* %FUNCTION: put_fd
* %ARGUMENTS:
* fd -- file descriptor to close
* %RETURNS:
* -1 if descriptor was closed; fd otherwise.
* %DESCRIPTION:
* If we are NOT conserving file descriptors, simply returns fd.
* If we ARE conserving file descriptors, closes fd and returns -1.
***********************************************************************/
static int
put_fd(int fd)
{
if (!ConserveDescriptors) return fd;
closefd(fd);
return -1;
}
/**********************************************************************
* %FUNCTION: do_reply
* %ARGUMENTS:
* ctx -- filter context
* code -- SMTP three-digit code
* dsn -- SMTP DSN status notification code
* reply -- text message (MAY BE MODIFIED!)
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Called if we KNOW reply contains carriage-returns.
* Sets the SMTP reply code and message. If smfi_setmlreply is available,
* call it. Otherwise, call smfi_setreply after changing carriage-returns
* to spaces.
***********************************************************************/
static sfsistat
do_reply(SMFICTX *ctx, char const *code, char const *dsn, char *reply)
{
char *s;
char *lines[MAX_ML_LINES+1];
int i;
/* If there are carriage returns and we don't have smfi_setmlreply,
change them to spaces and call smfi_setreply */
#ifndef MILTER_BUILDLIB_HAS_SETMLREPLY
for (s = reply; *s; s++) {
if (*s == '\n') *s = ' ';
}
return smfi_setreply(ctx, (char *) code, (char *) dsn, reply);
#else
/* Split on carriage-returns and pass to smfi_setmlreply */
for (i=0; i<MAX_ML_LINES+1; i++) {
lines[i] = NULL;
}
lines[0] = reply;
s = reply;
for (i=1; i<MAX_ML_LINES; i++) {
s = strchr(s, '\n');
if (!s) break;
*s++ = 0;
if (!*s) break;
lines[i] = s;
}
/* Convert remaining newlines to spaces */
while(s && *s) {
if (*s == '\n') *s = ' ';
s++;
}
/* Sigh... wtf were milter developers thinking??? */
return smfi_setmlreply(ctx, (char *) code, (char *) dsn,
lines[0], lines[1], lines[2], lines[3],
lines[4], lines[5], lines[6], lines[7],
lines[8], lines[9], lines[10], lines[11],
lines[12], lines[13], lines[14], lines[15],
lines[16], lines[17], lines[18], lines[19],
lines[20], lines[21], lines[22], lines[23],
lines[24], lines[25], lines[26], lines[27],
lines[28], lines[29], lines[30], lines[31]);
#endif
}
/**********************************************************************
* %FUNCTION: set_reply
* %ARGUMENTS:
* ctx -- filter context
* first -- digit with which code must start
* code -- SMTP three-digit code
* dsn -- SMTP DSN status notification code
* reply -- text message
* %RETURNS:
* Nothing
* %DESCRIPTION:
* Sets the SMTP reply code and message. code and dsn are validated.
***********************************************************************/
static sfsistat
set_reply(SMFICTX *ctx,
char const *first,
char const *code,
char const *dsn,
char const *reply)
{
char *safe_reply;
char stack_safe_reply[SMALLBUF];
sfsistat retcode;
char const *s;
char *t;
int len;
if (!reply || !*reply) {
if (*first == '4') {
reply = "Please try again later";
} else {
reply = "Forbidden for policy reasons";
}
}
if (!validate_smtp_code(code, first)) {
if (*first == '4') code = "451";
else code = "554";
}
if (!validate_smtp_dsn(dsn, first)) {
if (*first == '4') dsn = "4.3.0";
else dsn = "5.7.1";
}
/* We need to double any "%" chars in reply */
/* Worst-case, we'll double our length */
len = strlen(reply) * 2 + 1;
if (len <= SMALLBUF) {
/* avoid malloc if the reply is short enough */
safe_reply = stack_safe_reply;
} else {
safe_reply = malloc(len);
if (!safe_reply) {
syslog(LOG_ERR, "Out of memory to escape reply %s", reply);
return smfi_setreply(ctx, (char *) code, (char *) dsn, "Out of memory");
}
}
s = reply;
t = safe_reply;
while (*s) {
if (*s == '%') *t++ = '%';
/* Replace control chars except for \n with a space */
if ((*s < ' ' && *s != '\n') || *s == 0x7f) {
*t++ = ' ';
s++;
} else {
*t++ = *s++;
}
}
*t = 0;
if (!strchr(reply, '\n')) {
retcode = smfi_setreply(ctx, (char *) code, (char *) dsn, safe_reply);
} else {
retcode = do_reply(ctx, code, dsn, safe_reply);
}
if (safe_reply != stack_safe_reply) {
free(safe_reply);
}
return retcode;
}
/**********************************************************************
*%FUNCTION: mfconnect
*%ARGUMENTS:
* ctx -- Sendmail filter mail context
* hostname -- name of connecting host
* sa -- socket address of connecting host
*%RETURNS:
* SMFIS_TEMPFAIL or SMFIS_CONTINUE
*%DESCRIPTION:
* Allocates a private data structure for tracking this connection
***********************************************************************/
static sfsistat
mfconnect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *sa)
{
struct privdata *data;
char const *tmp;
char *me;
struct sockaddr_in *insa = (struct sockaddr_in *) sa;
#if defined(AF_INET6) && defined(HAVE_INET_NTOP)
struct sockaddr_in6 *in6sa = (struct sockaddr_in6 *) sa;
#endif
DEBUG_ENTER("mfconnect");
/* Delete any existing context data */
mfclose(ctx);
/* If too many running filters, reject connection at this phase.
However, if workersReservedForLoopback >= 0, accept or queue
connections from localhost
*/
if (!AllowNewConnectionsToQueue) {
int is_local;
int required_workers;
int n = MXCheckFreeWorkers(MultiplexorSocketName, NULL);
if (n < 0) {
syslog(LOG_WARNING, "mfconnect: Error communicating with multiplexor");
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (!sa) {
is_local = 1;
} else {
is_local = is_localhost(sa);
}
if (workersReservedForLoopback >= 0) {
if (is_local) {
required_workers = 0;
} else {
required_workers = workersReservedForLoopback;
}
} else {
required_workers = 0;
}
if (n <= required_workers) {
if (workersReservedForLoopback < 0 ||
! is_local) {
syslog(LOG_WARNING, "mfconnect: No free workers: Need %d, found %d", required_workers+1, n);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
}
}
data = malloc_with_log(sizeof *data);
if (!data) {
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
data->hostname = NULL;
data->hostip = NULL;
data->hostport = 0;
data->myip = NULL;
data->daemon_port = 0;
data->sender = NULL;
data->firstRecip = NULL;
data->dir = NULL;
data->heloArg = NULL;
data->qid_written = 0;
data->qid = NOQUEUE;
data->fd = -1;
data->headerFD = -1;
data->cmdFD = -1;
data->numContentTypeHeaders = 0;
data->seenMimeVersionHeader = 0;
data->validatePresent = 0;
data->suspiciousBody = 0;
data->lastWasCR = 0;
data->filterFailed = 0;
/* Save private data */
if (smfi_setpriv(ctx, data) != MI_SUCCESS) {
free(data);
/* Can't hurt... */
smfi_setpriv(ctx, NULL);
syslog(LOG_WARNING, "Unable to set private data pointer: smfi_setpriv failed");
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (hostname) {
data->hostname = strdup_with_log(hostname);
if (!data->hostname) {
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
} else {
data->hostname = NULL;
}
/* Port */
if (sa) {
#ifdef AF_INET6
if (sa->sa_family == AF_INET6) {
data->hostport = ntohs(in6sa->sin6_port);
}
#endif
if (sa->sa_family == AF_INET) {
data->hostport = ntohs(insa->sin_port);
}
}
/* Padding -- should be big enough for IPv6 addresses */
if (!sa) {
data->hostip = NULL;
} else {
data->hostip = malloc_with_log(65);
if (!data->hostip) {
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
#ifdef HAVE_INET_NTOP
#ifdef AF_INET6
if (sa->sa_family == AF_INET6) {
tmp = inet_ntop(AF_INET6, &in6sa->sin6_addr, data->hostip, 65);
/* Convert IPv6-mapped IPv4 address to pure IPv4. That is:
::ffff:xxx.yyy.zzz.www to simply xxx.yyy.zzz.www */
if (tmp) {
if (IN6_IS_ADDR_V4MAPPED(&in6sa->sin6_addr) ||
IN6_IS_ADDR_V4COMPAT(&in6sa->sin6_addr)) {
if (strchr(data->hostip, '.')) {
char const *lastcolon = strrchr(data->hostip, ':');
char *dst = data->hostip;
while(lastcolon) {
lastcolon++;
*dst++ = *lastcolon;
if (!*lastcolon) break;
}
}
}
}
} else
#endif
if (sa->sa_family == AF_INET) {
tmp = inet_ntop(AF_INET, &insa->sin_addr, data->hostip, 65);
} else if (sa->sa_family == AF_LOCAL) {
tmp = "127.0.0.1";
strcpy(data->hostip, tmp);
} else {
syslog(LOG_WARNING, "Unknown address family %d",
(int) sa->sa_family);
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
#else
pthread_mutex_lock(&ntoa_mutex);
tmp = inet_ntoa(insa->sin_addr);
if (tmp) strncpy(data->hostip, tmp, 64);
pthread_mutex_unlock(&ntoa_mutex);
#endif
if (!tmp) {
syslog(LOG_WARNING, "inet_ntoa or inet_ntop failed: %m");
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
data->hostip[64] = 0;
}
/* Is host IP equivalent to loopback? If so, replace with 127.0.0.1 */
/* (We have enough room because data->hostip can hold 64 chars + nul) */
if (data->hostip &&
EquivToLoopback &&
!strcmp(data->hostip, EquivToLoopback)) {
strcpy(data->hostip, "127.0.0.1");
}
data->dir = NULL;
data->fd = -1;
data->headerFD = -1;
data->cmdFD = -1;
data->suspiciousBody = 0;
data->lastWasCR = 0;
/* Get my IP address */
me = smfi_getsymval(ctx, "{if_addr}");
if (me && *me && MyIPAddress && !strcmp(me, MyIPAddress)) {
data->myip = MyIPAddress;
} else if (me && *me && strcmp(me, "127.0.0.1")) {
data->myip = strdup_with_log(me);
} else {
/* Sigh... use our computed address */
data->myip = MyIPAddress;
}
/* Get my port */
if (!data->daemon_port) {
me = smfi_getsymval(ctx, "{daemon_port}");
if (me && *me) {
sscanf(me, "%u", &(data->daemon_port));
}
}
if (doRelayCheck) {
char buf2[SMALLBUF];
int n = MXRelayOK(MultiplexorSocketName, buf2, data->hostip,
data->hostname, data->hostport, data->myip, data->daemon_port);
if (n == MD_REJECT) {
/* Can't call smfi_setreply from connect callback */
/* set_dsn(ctx, buf2, 5); */
/* We reject connections from this relay */
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_REJECT");
return SMFIS_REJECT;
}
if (n <= MD_TEMPFAIL) {
/* Can't call smfi_setreply from connect callback */
/* set_dsn(ctx, buf2, 4); */
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (n == MD_ACCEPT_AND_NO_MORE_FILTERING) {
/* Can't call smfi_setreply from connect callback */
/* set_dsn(ctx, buf2, 2); */
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_ACCEPT");
return SMFIS_ACCEPT;
}
if (n == MD_DISCARD) {
/* Can't call smfi_setreply from connect callback */
/* set_dsn(ctx, buf2, 2); */
cleanup(ctx);
DEBUG_EXIT("mfconnect", "SMFIS_DISCARD");
return SMFIS_DISCARD;
}
}
DEBUG_EXIT("mfconnect", "SMFIS_CONTINUE");
return SMFIS_CONTINUE;
}
/**********************************************************************
* %FUNCTION: helo
* %ARGUMENTS:
* ctx -- Milter context
* helohost -- argument to "HELO" or "EHLO" SMTP command
* %RETURNS:
* SMFIS_CONTINUE
* %DESCRIPTION:
* Stores the HELO argument in the private data area
***********************************************************************/
static sfsistat
helo(SMFICTX *ctx, char *helohost)
{
struct privdata *data = DATA;
DEBUG_ENTER("helo");
if (!data) {
DEBUG_EXIT("helo", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (data->heloArg) {
free(data->heloArg);
data->heloArg = NULL;
}
data->heloArg = strdup_with_log(helohost);
if (doHeloCheck) {
char buf2[SMALLBUF];
int n = MXHeloOK(MultiplexorSocketName, buf2, data->hostip,
data->hostname, data->heloArg, data->hostport, data->myip, data->daemon_port);
if (n == MD_REJECT) {
set_dsn(ctx, buf2, 5);
cleanup(ctx);
DEBUG_EXIT("helo", "SMFIS_REJECT");
return SMFIS_REJECT;
}
if (n <= MD_TEMPFAIL) {
set_dsn(ctx, buf2, 4);
cleanup(ctx);
DEBUG_EXIT("helo", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (n == MD_ACCEPT_AND_NO_MORE_FILTERING) {
set_dsn(ctx, buf2, 2);
cleanup(ctx);
DEBUG_EXIT("helo", "SMFIS_ACCEPT");
return SMFIS_ACCEPT;
}
if (n == MD_DISCARD) {
set_dsn(ctx, buf2, 2);
cleanup(ctx);
DEBUG_EXIT("helo", "SMFIS_DISCARD");
return SMFIS_DISCARD;
}
if (n == MD_CONTINUE) {
/* Called only in case we need to delay */
set_dsn(ctx, buf2, 2);
}
}
DEBUG_EXIT("helo", "SMFIS_CONTINUE");
return SMFIS_CONTINUE;
}
/**********************************************************************
*%FUNCTION: envfrom
*%ARGUMENTS:
* ctx -- Sendmail filter mail context
* from -- list of arguments to "MAIL FROM:" SMTP command.
*%RETURNS:
* SMFIS_TEMPFAIL or SMFIS_CONTINUE
*%DESCRIPTION:
* Allocates a private data structure for tracking this message, and
* opens a temporary file for saving message body.
***********************************************************************/
static sfsistat
envfrom(SMFICTX *ctx, char **from)
{
struct privdata *data;
int i;
char buffer[SMALLBUF];
char buf2[SMALLBUF];
char *queueid;
char **macro;
dynamic_buffer dbuf;
char mxid[MX_ID_LEN+1];
DEBUG_ENTER("envfrom");
/* Generate the MIMEDefang ID */
(void) gen_mx_id(mxid);
/* Get the private context */
data = DATA;
if (!data) {
syslog(LOG_WARNING, "envfrom: Unable to obtain private data from milter context");
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
/* Obtain the queue identifier */
queueid = smfi_getsymval(ctx, "i");
if (data->qid && data->qid != NOQUEUE) {
free(data->qid);
data->qid = NOQUEUE;
data->qid_written = 0;
}
if (queueid && *queueid) {
data->qid = strdup_with_log(queueid);
if (!data->qid) {
data->qid = NOQUEUE;
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
}
/* Copy sender */
if (data->sender) {
free(data->sender);
}
data->sender = strdup_with_log(from[0]);
if (!data->sender) {
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
/* Old data lying around? */
if (data->firstRecip) {
free(data->firstRecip);
data->firstRecip = NULL;
}
/* Make the working directory */
if (!data->qid || data->qid == NOQUEUE) {
/* No queue ID, so use the mxid */
snprintf(buffer, SMALLBUF, "%s/mdefang-%s", SpoolDir, mxid);
} else {
/* We have a queue ID, so use it */
snprintf(buffer, SMALLBUF, "%s/mdefang-%s", SpoolDir, data->qid);
}
if (mkdir(buffer, 0750) != 0) {
/* Could not create temp. directory */
syslog(LOG_WARNING, "%s: Could not create directory %s: %m",
data->qid, buffer);
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (data->fd >= 0) closefd(data->fd);
if (data->headerFD >= 0) closefd(data->headerFD);
if (data->cmdFD >= 0) closefd(data->cmdFD);
if (data->dir) {
/* Clean data->dir up if it's still lying around */
if (access(data->dir, R_OK) == 0) {
(void) rm_r(data->qid, data->dir);
}
free(data->dir);
data->dir = NULL;
}
data->fd = -1;
data->headerFD = -1;
data->cmdFD = -1;
data->validatePresent = 0;
data->filterFailed = 0;
data->numContentTypeHeaders = 0;
data->seenMimeVersionHeader = 0;
data->dir = strdup_with_log(buffer);
if (!data->dir) {
/* Don't forget to clean up directory... */
rmdir(buffer);
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
/* Create the HEADERS file. Even if we get a wacky e-mail without
* any headers, we want an empty HEADERS file lying around */
data->headerFD = get_fd(data, "HEADERS", data->headerFD);
if (data->headerFD >= 0) {
data->headerFD = put_fd(data->headerFD);
}
/* Initialize the dynamic buffer for writing COMMANDS file */
dbuf_init(&dbuf);
/* Generate an ID */
append_mx_command(&dbuf, 'i', mxid);
/* Write the sender */
append_mx_command(&dbuf, 'S', from[0]);
/* Write ESMTP args */
for (i=1; from[i]; i++) {
append_mx_command(&dbuf, 's', from[i]);
}
/* Write the standard macros */
macro = StandardSendmailMacros;
while (*macro) {
append_macro_value(&dbuf, ctx, *macro);
macro++;
}
/* Fake client_port: We don't get the macro, but we have the connection
info cached in our private data area. */
dbuf_putc(&dbuf, '=');
append_percent_encoded(&dbuf, "client_port");
dbuf_putc(&dbuf, ' ');
{
char portstring[32];
snprintf(portstring, sizeof(portstring), "%u", data->hostport);
append_percent_encoded(&dbuf, portstring);
}
dbuf_putc(&dbuf, '\n');
/* Write any additional macros requested by user */
for (i=0; i<NumAdditionalMacros; i++) {
append_macro_value(&dbuf, ctx, AdditionalMacros[i]);
}
/* Clear out any old myip address */
if (data->myip && (data->myip != MyIPAddress)) {
free(data->myip);
data->myip = NULL;
}
if (queueid) {
append_mx_command(&dbuf, 'Q', queueid);
data->qid_written = 1;
}
/* Write host name and host IP */
append_mx_command(&dbuf, 'H', data->hostname);
append_mx_command(&dbuf, 'I', data->hostip);
/* Write HELO value */
if (data->heloArg) {
append_mx_command(&dbuf, 'E', data->heloArg);
}
/* Now actually dump the dbuf contents to COMMANDS */
/* Open command file */
data->cmdFD = get_fd(data, "COMMANDS", data->cmdFD);
if (data->cmdFD < 0) {
dbuf_free(&dbuf);
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
if (write_dbuf(&dbuf, data->cmdFD, data, "COMMANDS") < 0) {
dbuf_free(&dbuf);
cleanup(ctx);
DEBUG_EXIT("envfrom", "SMFIS_TEMPFAIL");
return SMFIS_TEMPFAIL;
}
dbuf_free(&dbuf);
data->cmdFD = put_fd(data->cmdFD);
if (doSenderCheck) {
int n = MXSenderOK(MultiplexorSocketName, buf2,
(char const **) from, data->hostip, data->hostname,
data->heloArg, data->dir, data->qid);
if (n == MD_REJECT) {
set_dsn(ctx, buf2, 5);
/* We reject connections from this sender */
cleanup(ctx);