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/*
* Copyright (c) 2004, Nate Nielsen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * 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.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
*
* CONTRIBUTORS
* Nate Nielsen <nielsen@memberwebs.com>
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <errno.h>
#include "usuals.h"
#include "compat.h"
#include "sock_any.h"
#include "stringx.h"
#define SP_LEGACY_OPTIONS
#include "smtppass.h"
/* -----------------------------------------------------------------------
* STRUCTURES
*/
enum {
ACTION_DROP,
ACTION_BOUNCE,
ACTION_PASS
};
typedef struct clstate
{
/* Settings ------------------------------- */
struct sockaddr_any clamaddr; /* Address for connecting to clamd */
const char* clamname;
const char* directory; /* The directory for temp files */
const char* virusaction; /* Program to run when event occurs */
int action; /* Which action to take on a virus */
int quarantine; /* Leave virus files in temp dir */
int debug_files; /* Leave all files in temp dir */
const char* header; /* A header to include in emails */
}
clstate_t;
typedef struct clctx
{
spctx_t sp; /* The main sp context */
spio_t clam; /* Connection to clamd */
}
clctx_t;
/* -----------------------------------------------------------------------
* STRINGS
*/
#define CRLF "\r\n"
#define SMTP_DATAVIRUSOK "250 Virus Detected; Discarded Email" CRLF
#define SMTP_DATAVIRUS "550 Virus Detected; Content Rejected" CRLF
#define CLAM_OK "OK"
#define CLAM_ERROR "ERROR"
#define CLAM_FOUND "FOUND"
#define CLAM_SCAN "SCAN "
#ifdef USE_CLAM_SESSION
#define CONNECT_RSP "PONG"
#define CLAM_CONNECT "SESSION\nPING\n"
#define CLAM_DISCONNECT "END\n"
#endif
#define DEFAULT_CONFIG CONF_PREFIX "/clamsmtpd.conf"
#define DEFAULT_CLAMAV "/var/run/clamav/clamd"
#define DEFAULT_HEADER "X-Virus-Scanned: ClamAV using ClamSMTP"
#define VIRUS_HEADER "X-Virus-Infected: Virus Detected!"
/* -----------------------------------------------------------------------
* CONFIGURATION OPTIONS
*
* - Be sure your option is relevant to this file. Certain options
* should go into smtppass.c
* - Add field to clstate_t structure (above)
* - Add default (above) and set in main (below). Required options
* are difficult to implement under the current structure. It's
* better to have a sane default.
* - Add config keyword (below)
* - Parsing and validation of option in cb_parse_option (below)
* - Document in the sample doc/clamsmtpd.conf
* - Document in doc/clamsmtpd.conf.5
*/
#define CFG_CLAMADDR "ClamAddress"
#define CFG_DIRECTORY "TempDirectory"
#define CFG_HEADER "Header"
#define CFG_SCANHEADER "ScanHeader"
#define CFG_HEADER "Header"
#define CFG_BOUNCE "Bounce"
#define CFG_ACTION "Action"
#define CFG_QUARANTINE "Quarantine"
#define CFG_DEBUGFILES "DebugFiles"
#define CFG_VIRUSACTION "VirusAction"
#define VAL_BOUNCE "bounce"
#define VAL_DROP "drop"
#define VAL_PASS "pass"
/* -----------------------------------------------------------------------
* GLOBALS
*/
clstate_t g_clstate;
/* -----------------------------------------------------------------------
* FORWARD DECLARATIONS
*/
static void usage();
static int connect_clam(clctx_t* ctx);
static int disconnect_clam(clctx_t* ctx);
static int virus_action(clctx_t* ctx, const char* virus);
static int clam_scan_file(clctx_t* ctx, const char** virus);
/* -----------------------------------------------------------------------
* SIMPLE MACROS
*/
/* ----------------------------------------------------------------------------------
* STARTUP ETC...
*/
#ifndef HAVE___ARGV
char** __argv;
#endif
int main(int argc, char* argv[])
{
const char* configfile = DEFAULT_CONFIG;
const char* pidfile = NULL;
int dbg_level = -1;
int warnargs = 0;
int ch = 0;
int r;
char* t;
#ifndef HAVE___ARGV
__argv = argv;
#endif
/* Configuration defaults */
memset(&g_clstate, 0, sizeof(g_clstate));
g_clstate.directory = _PATH_TMP;
/* We need the default to parse into a useable form, so we do this: */
r = cb_parse_option(CFG_CLAMADDR, DEFAULT_CLAMAV);
ASSERT(r == 1);
sp_init("clamsmtpd");
/* COMPAT: Setup a default header */
sp_parse_option(CFG_HEADER, DEFAULT_HEADER);
/*
* We still accept our old arguments for compatibility reasons.
* We fill them into the spstate structure directly
*/
/* Parse the arguments nicely */
while((ch = getopt(argc, argv, "bc:d:D:f:h:l:m:p:qt:v")) != -1)
{
switch(ch)
{
/* COMPAT: Actively reject messages */
case 'b':
if((r = cb_parse_option(CFG_BOUNCE, "on")) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* COMPAT: Change the CLAM socket */
case 'c':
if((r = cb_parse_option(CFG_CLAMADDR, "on")) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* Don't daemonize */
case 'd':
dbg_level = strtol(optarg, &t, 10);
if(*t) /* parse error */
errx(1, "invalid debug log level");
dbg_level += LOG_ERR;
break;
/* COMPAT: The directory for the files */
case 'D':
if((r = sp_parse_option(CFG_DIRECTORY, optarg)) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* The configuration file */
case 'f':
configfile = optarg;
break;
/* COMPAT: The header to add */
case 'h':
if((r = cb_parse_option(CFG_HEADER, optarg)) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* COMPAT: Change our listening port */
case 'l':
if((r = sp_parse_option("Listen", optarg)) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* COMPAT: The maximum number of threads */
case 'm':
if((r = sp_parse_option("MaxConnections", optarg)) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* Write out a pid file */
case 'p':
pidfile = optarg;
break;
/* COMPAT: The timeout */
case 't':
if((r = sp_parse_option("TimeOut", optarg)) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* COMPAT: Leave virus files in directory */
case 'q':
if((r = cb_parse_option(CFG_QUARANTINE, "on")) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* Print version number */
case 'v':
printf("clamsmtpd (version %s)\n", VERSION);
printf(" (config: %s)\n", DEFAULT_CONFIG);
exit(0);
break;
/* COMPAT: Leave all files in the tmp directory */
case 'X':
if((r = cb_parse_option(CFG_DEBUGFILES, "on")) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
break;
/* Usage information */
case '?':
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if(argc > 1)
usage();
if(argc == 1)
{
/* COMPAT: The out address */
if((r = sp_parse_option("OutAddress", argv[0])) < 0)
usage();
ASSERT(r == 1);
warnargs = 1;
}
if(warnargs)
warnx("please use configuration file instead of command-line flags: %s", configfile);
r = sp_run(configfile, pidfile, dbg_level);
sp_done();
return r;
}
static void usage()
{
fprintf(stderr, "usage: clamsmtpd [-d debuglevel] [-f configfile] [-p pidfile]\n");
fprintf(stderr, " clamsmtpd -v\n");
exit(2);
}
/* ----------------------------------------------------------------------------------
* SP CALLBACKS
*/
int cb_check_data(spctx_t* sp)
{
int r = 0;
const char* virus;
clctx_t* ctx = (clctx_t*)sp;
/* ClamAV doesn't like empty files */
if((r = sp_cache_data(sp)) > 0)
{
/* Connect to clamav */
if(!spio_valid(&(ctx->clam)))
r = connect_clam(ctx);
if(r != -1)
r = clam_scan_file(ctx, &virus);
}
switch(r)
{
/*
* There was an error tell the client. We haven't notified
* the server about any of this yet
*/
case -1:
if(sp_fail_data(sp, NULL) == -1)
return -1;
break;
/*
* No virus was found. Now we initiate a connection to the server
* and transfer the file to it.
*/
case 0:
if(sp_done_data(sp, g_clstate.header) == -1)
return -1;
break;
/*
* A virus was found, normally we just drop the email. But if
* requested we can send a simple message back to our client.
* The server doesn't know data was ever sent, and the client can
* choose to reset the connection to reuse it if it wants.
*/
case 1:
/* Any special post operation actions on the virus */
virus_action(ctx, virus);
switch(g_clstate.action)
{
case ACTION_DROP:
if(sp_fail_data(sp, SMTP_DATAVIRUSOK) == -1)
return -1;
break;
case ACTION_BOUNCE:
if(sp_fail_data(sp, SMTP_DATAVIRUS) == -1)
return -1;
break;
case ACTION_PASS:
if(sp_done_data(sp, VIRUS_HEADER) == -1)
return -1;
break;
default:
ASSERT(0 && "Invalid action");
break;
}
break;
default:
ASSERT(0 && "Invalid clam_scan_file return value");
break;
};
return 0;
}
int cb_parse_option(const char* name, const char* value)
{
if(strcasecmp(CFG_CLAMADDR, name) == 0)
{
if(sock_any_pton(value, &(g_clstate.clamaddr), SANY_OPT_DEFLOCAL) == -1)
errx(2, "invalid " CFG_CLAMADDR " socket name: %s", value);
g_clstate.clamname = value;
return 1;
}
/* COMPAT: Parse old header option */
else if(strcasecmp(CFG_SCANHEADER, name) == 0)
{
warnx("please use \"Header\" option instead of \"ScanHeader\"");
g_clstate.header = trim_start(value);
if(strlen(g_clstate.header) == 0)
g_clstate.header = NULL;
}
else if(strcasecmp(CFG_HEADER, name) == 0)
{
g_clstate.header = trim_start(value);
if(strlen(g_clstate.header) == 0)
g_clstate.header = NULL;
return 1;
}
else if(strcasecmp(CFG_DIRECTORY, name) == 0)
{
g_clstate.directory = value;
return 1;
}
/* COMPAT: Subsumed by the 'Action' option */
else if(strcasecmp(CFG_BOUNCE, name) == 0)
{
int bounce = strtob(value);
if(bounce == -1)
errx(2, "invalid value for " CFG_BOUNCE);
if(bounce)
g_clstate.action = ACTION_BOUNCE;
warnx("please use \"Action\" option instead of \"Bounce\"");
return 1;
}
else if(strcasecmp(CFG_ACTION, name) == 0)
{
if(strcasecmp(VAL_BOUNCE, value) == 0)
g_clstate.action = ACTION_BOUNCE;
else if(strcasecmp(VAL_DROP, value) == 0)
g_clstate.action = ACTION_DROP;
else if(strcasecmp(VAL_PASS, value) == 0)
g_clstate.action = ACTION_PASS;
else
errx(2, "invalid value for " CFG_ACTION);
return 1;
}
else if(strcasecmp(CFG_QUARANTINE, name) == 0)
{
if((g_clstate.quarantine = strtob(value)) == -1)
errx(2, "invalid value for " CFG_QUARANTINE);
return 1;
}
else if(strcasecmp(CFG_DEBUGFILES, name) == 0)
{
if((g_clstate.debug_files = strtob(value)) == -1)
errx(2, "invalid value for " CFG_DEBUGFILES);
return 1;
}
else if(strcasecmp(CFG_VIRUSACTION, name) == 0)
{
g_clstate.virusaction = value;
return 1;
}
return 0;
}
spctx_t* cb_new_context()
{
clctx_t* ctx = (clctx_t*)calloc(1, sizeof(clctx_t));
if(!ctx)
{
sp_messagex(NULL, LOG_CRIT, "out of memory");
return NULL;
}
/* Initial preparation of the structure */
spio_init(&(ctx->clam), "CLAMAV");
return &(ctx->sp);
}
void cb_del_context(spctx_t* sp)
{
clctx_t* ctx = (clctx_t*)sp;
int x;
ASSERT(sp);
disconnect_clam(ctx);
free(ctx);
if(g_clstate.virusaction)
{
/* Cleanup any old actions */
while(waitpid(-1, &x, WNOHANG) > 0)
;
}
}
/* ----------------------------------------------------------------------------------
* CLAM AV
*/
static int connect_clam(clctx_t* ctx)
{
int ret = 0;
spctx_t* sp = &(ctx->sp);
ASSERT(ctx);
ASSERT(!spio_valid(&(ctx->clam)));
if(spio_connect(sp, &(ctx->clam), &(g_clstate.clamaddr), g_clstate.clamname) == -1)
RETURN(-1);
spio_read_junk(sp, &(ctx->clam));
#ifdef USE_CLAM_SESSION
/* Send a session and a check header to ClamAV */
if(spio_write_data(sp, &(ctx->clam), "SESSION\n") == -1)
RETURN(-1);
spio_read_junk(sp, &(ctx->clam));
/*
if(spio_write_data(sp, &(ctx->clam), "PING\n") == -1 ||
spio_read_line(sp, &(ctx->clam), CLIO_DISCARD | CLIO_TRIM) == -1)
RETURN(-1);
if(strcmp(sp->line, CONNECT_RESPONSE) != 0)
{
sp_message(sp, LOG_ERR, "clamd sent an unexpected response: %s", ctx->line);
RETURN(-1);
}
*/
#endif
cleanup:
if(ret < 0 && spio_valid(&(ctx->clam)))
spio_disconnect(sp, &(ctx->clam));
return ret;
}
static int disconnect_clam(clctx_t* ctx)
{
spctx_t* sp = &(ctx->sp);
if(!spio_valid(&(ctx->clam)))
return 0;
#ifdef USE_CLAM_SESSION
if(spio_write_data(sp, &(ctx->clam), CLAM_DISCONNECT) != -1)
spio_read_junk(sp, &(ctx->clam));
#endif
spio_disconnect(sp, &(ctx->clam));
return 0;
}
static int clam_scan_file(clctx_t* ctx, const char** virus)
{
int len, x;
int ret = 0;
char* line;
spctx_t* sp = &(ctx->sp);
/* Connect to clamav */
if(!spio_valid(&(ctx->clam)))
{
if(connect_clam(ctx) == -1)
RETURN(-1);
}
ASSERT(ctx && virus);
*virus = NULL;
/* Needs to be long enough to hold path names */
ASSERT(SP_LINE_LENGTH > MAXPATHLEN + 32);
line = ctx->clam.line;
strcpy(line, CLAM_SCAN);
strcat(line, sp->cachename);
strcat(line, "\n");
if(spio_write_data(sp, &(ctx->clam), line) == -1)
RETURN(-1);
len = spio_read_line(sp, &(ctx->clam), SPIO_DISCARD | SPIO_TRIM);
if(len == 0)
{
sp_messagex(sp, LOG_ERR, "clamd disconnected unexpectedly");
RETURN(-1);
}
if(is_last_word(line, CLAM_OK, KL(CLAM_OK)))
{
sp_add_log(sp, "status=", "CLEAN");
sp_messagex(sp, LOG_DEBUG, "no virus");
RETURN(0);
}
/*
* When a virus is found the returned line from
* clamd looks something like this:
*
* /path/to/virus: Virus.XXXX FOUND
*/
if(is_last_word(line, CLAM_FOUND, KL(CLAM_FOUND)))
{
x = strlen(sp->cachename);
/* A little sanity check ... */
if(len > x + KL(CLAM_FOUND))
{
/* Remove the "FOUND" from the end */
line[len - KL(CLAM_FOUND)] = 0;
/* Skip the filename returned, and colon */
line += x + 1;
line = trim_space(line);
sp_messagex(sp, LOG_DEBUG, "found virus: %s", line);
sp_add_log(sp, "status=VIRUS:", line);
*virus = line;
}
else
{
sp_messagex(sp, LOG_WARNING, "couldn't parse virus name from clamd response: %s", line);
sp_add_log(sp, "status=", "VIRUS");
*virus = "Unparsable.Virus.Name";
}
RETURN(1);
}
if(is_last_word(line, CLAM_ERROR, KL(CLAM_ERROR)))
{
sp_messagex(sp, LOG_ERR, "clamav error: %s", line);
sp_add_log(sp, "status=", "CLAMAV-ERROR");
RETURN(-1);
}
sp_add_log(sp, "status=", "CLAMAV-ERROR");
sp_messagex(sp, LOG_ERR, "unexepected response from clamd: %s", line);
RETURN(-1);
cleanup:
#ifndef USE_CLAM_SESSION
disconnect_clam(ctx);
#endif
return ret;
}
/* ----------------------------------------------------------------------------------
* TEMP FILE HANDLING
*/
static int virus_action(clctx_t* ctx, const char* virus)
{
char qfilename[MAXPATHLEN];
spctx_t* sp = &(ctx->sp);
char* t;
int i;
pid_t pid;
if(g_clstate.quarantine)
{
strlcpy(qfilename, g_clstate.directory, MAXPATHLEN);
strlcat(qfilename, "/virus.", MAXPATHLEN);
/* Points to null terminator */
t = qfilename + strlen(qfilename);
/*
* Yes, I know we're using mktemp. And yet we're doing it in
* a safe manner due to the link command below not overwriting
* existing files.
*/
for(;;)
{
/* Null terminate off the ending, and replace with X's for mktemp */
*t = 0;
strlcat(qfilename, "XXXXXX", MAXPATHLEN);
if(!mktemp(qfilename))
{
sp_message(sp, LOG_ERR, "couldn't create quarantine file name");
return -1;
}
/* Try to link the file over to the temp */
if(link(sp->cachename, qfilename) == -1)
{
/* We don't want to allow race conditions */
if(errno == EEXIST)
{
sp_message(sp, LOG_WARNING, "race condition when quarantining virus file: %s", qfilename);
continue;
}
sp_message(sp, LOG_ERR, "couldn't quarantine virus file");
return -1;
}
break;
}
sp_messagex(sp, LOG_INFO, "quarantined virus file as: %s", qfilename);
}
if(g_clstate.virusaction != NULL)
{
/* Cleanup any old actions */
while(waitpid(-1, &i, WNOHANG) > 0)
;
sp_messagex(sp, LOG_DEBUG, "executing virus action: %s", g_clstate.virusaction);
switch(pid = fork())
{
case -1:
sp_message(sp, LOG_ERR, "couldn't fork for virus action");
return -1;
/* The child */
case 0:
/* Close std descriptors */
for(i = 0; i <= 2; i++)
close(i);
/* Set the environment variables */
sp_setup_forked(sp, 0);
/* When quarantining we can hand the file name off */
if(g_clstate.quarantine)
setenv("EMAIL", qfilename, 1);
if(virus)
setenv("VIRUS", virus, 1);
/* And execute the program */
execl("/bin/sh", "sh", "-c", g_clstate.virusaction, NULL);
/* If that returned then there was an error, but there's
* not much we can do about it. */
_exit(1);
break;
};
}
return 0;
}
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