Gitweb:
http://git.exim.org/exim.git/commitdiff/b1f8e4f8ec26ecb99e56a0ed3a5140b65ec95a97
Commit: b1f8e4f8ec26ecb99e56a0ed3a5140b65ec95a97
Parent: 67d81c106c8dd7da50b57eb5ceeb61d91a2c51e8
Author: Jeremy Harris <jgh146exb@???>
AuthorDate: Sun Mar 9 21:45:33 2014 +0000
Committer: Jeremy Harris <jgh146exb@???>
CommitDate: Sun Mar 9 21:45:33 2014 +0000
Refactor malware.c and introduce new scanner type "sock". Bugs 1418 and 1396
---
doc/doc-docbook/spec.xfpt | 18 +
doc/doc-txt/ChangeLog | 3 +
doc/doc-txt/NewStuff | 5 +
src/src/acl.c | 18 +-
src/src/expand.c | 77 +--
src/src/functions.h | 4 +-
src/src/ip.c | 101 ++-
src/src/malware.c | 3037 ++++++++++++++++++++-------------------------
src/src/string.c | 4 +-
9 files changed, 1483 insertions(+), 1784 deletions(-)
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 345effd..cab1c82 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -29810,6 +29810,24 @@ av_scanner = mksd:2
.endd
You can safely omit this option (the default value is 1).
+.vitem &%sock%&
+.cindex "virus scanners" "simple socket-connected"
+This is a general-purpose way of talking to simple scanner daemons
+running on the local machine.
+There are four options:
+an address (which may be an IP addres and port, or the path of a Unix socket),
+a commandline to send (may include a single %s which will be replaced with
+the path to the mail file to be scanned),
+an RE to trigger on from the returned data,
+an RE to extract malware_name from the returned data.
+For example:
+.code
+av_scanner = sock:127.0.0.1 6001:%s:(SPAM|VIRUS):(.*)\$
+.endd
+Default for the socket specifier is &_/tmp/malware.sock_&.
+Default for the commandline is &_%s\n_&.
+Both regular-expressions are required.
+
.vitem &%sophie%&
.cindex "virus scanners" "Sophos and Sophie"
Sophie is a daemon that uses Sophos' &%libsavi%& library to scan for viruses.
diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 493861f..04a7ce0 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -54,6 +54,9 @@ JH/05 Bugzilla 305: Log incoming-TLS details on rejects, subject to log
JH/06 Log outbound-TLS and port details, subject to log selectors, for a
failed delivery.
+JH/07 Add malware type "sock" for talking to simple daemon.
+
+
Exim version 4.82
-----------------
diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index 04ac831..c4de902 100644
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -22,6 +22,11 @@ Version 4.83
3. New expansion operator ${utf8clean:string} to replace malformed UTF8
codepoints with valid ones.
+ 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
+ command line and matching a regex against the return data for trigger
+ and a second regex to extract malware_name. The mail spoofile name can
+ be included in the command line.
+
Version 4.82
------------
diff --git a/src/src/acl.c b/src/src/acl.c
index 386754f..fd958aa 100644
--- a/src/src/acl.c
+++ b/src/src/acl.c
@@ -2857,9 +2857,9 @@ uschar *portstr;
uschar *portend;
host_item *h;
int portnum;
-int host_af;
int len;
int r, s;
+uschar * errstr;
hostname = string_nextinlist(&arg, &sep, NULL, 0);
portstr = string_nextinlist(&arg, &sep, NULL, 0);
@@ -2906,14 +2906,18 @@ if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN)
HDEBUG(D_acl)
debug_printf("udpsend [%s]:%d %s\n", h->address, portnum, arg);
-host_af = (Ustrchr(h->address, ':') == NULL)? AF_INET:AF_INET6;
-r = s = ip_socket(SOCK_DGRAM, host_af);
-if (r < 0) goto defer;
-r = ip_connect(s, host_af, h->address, portnum, 1);
+r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum,
+ 1, NULL, &errstr);
if (r < 0) goto defer;
len = Ustrlen(arg);
r = send(s, arg, len, 0);
-if (r < 0) goto defer;
+if (r < 0)
+ {
+ errstr = US strerror(errno);
+ close(s);
+ goto defer;
+ }
+close(s);
if (r < len)
{
*log_msgptr =
@@ -2927,7 +2931,7 @@ HDEBUG(D_acl)
return OK;
defer:
-*log_msgptr = string_sprintf("\"udpsend\" failed: %s", strerror(errno));
+*log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr);
return DEFER;
}
diff --git a/src/src/expand.c b/src/src/expand.c
index ee7b2fd..bd097db 100644
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -4499,10 +4499,7 @@ while (*s != 0)
if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
{
- BOOL connected = FALSE;
- int namelen, port;
- host_item shost;
- host_item *h;
+ int port;
uschar *server_name = sub_arg[0] + 5;
uschar *port_name = Ustrrchr(server_name, ':');
@@ -4539,76 +4536,9 @@ while (*s != 0)
port = ntohs(service_info->s_port);
}
- /* Sort out the server. */
-
- shost.next = NULL;
- shost.address = NULL;
- shost.port = port;
- shost.mx = -1;
-
- namelen = Ustrlen(server_name);
-
- /* Anything enclosed in [] must be an IP address. */
-
- if (server_name[0] == '[' &&
- server_name[namelen - 1] == ']')
- {
- server_name[namelen - 1] = 0;
- server_name++;
- if (string_is_ip_address(server_name, NULL) == 0)
- {
- expand_string_message =
- string_sprintf("malformed IP address \"%s\"", server_name);
- goto EXPAND_FAILED;
- }
- shost.name = shost.address = server_name;
- }
-
- /* Otherwise check for an unadorned IP address */
-
- else if (string_is_ip_address(server_name, NULL) != 0)
- shost.name = shost.address = server_name;
-
- /* Otherwise lookup IP address(es) from the name */
-
- else
- {
- shost.name = server_name;
- if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, NULL,
- FALSE) != HOST_FOUND)
- {
- expand_string_message =
- string_sprintf("no IP address found for host %s", shost.name);
- goto EXPAND_FAILED;
- }
- }
-
- /* Try to connect to the server - test each IP till one works */
-
- for (h = &shost; h != NULL; h = h->next)
- {
- int af = (Ustrchr(h->address, ':') != 0)? AF_INET6 : AF_INET;
- if ((fd = ip_socket(SOCK_STREAM, af)) == -1)
- {
- expand_string_message = string_sprintf("failed to create socket: "
- "%s", strerror(errno));
+ if ((fd = ip_connectedsocket(SOCK_STREAM, server_name, port, port,
+ timeout, NULL, &expand_string_message)) < 0)
goto SOCK_FAIL;
- }
-
- if (ip_connect(fd, af, h->address, port, timeout) == 0)
- {
- connected = TRUE;
- break;
- }
- }
-
- if (!connected)
- {
- expand_string_message = string_sprintf("failed to connect to "
- "socket %s: couldn't connect to any host", sub_arg[0],
- strerror(errno));
- goto SOCK_FAIL;
- }
}
/* Handle a Unix domain socket */
@@ -5355,7 +5285,6 @@ while (*s != 0)
uschar *list, *expr, *temp;
uschar *save_iterate_item = iterate_item;
uschar *save_lookup_value = lookup_value;
- BOOL dummy;
while (isspace(*s)) s++;
if (*s++ != '{') goto EXPAND_FAILED_CURLY;
diff --git a/src/src/functions.h b/src/src/functions.h
index c6cb301..a94fac3 100644
--- a/src/src/functions.h
+++ b/src/src/functions.h
@@ -171,6 +171,8 @@ extern int host_scan_for_local_hosts(host_item *, host_item **, BOOL *);
extern void invert_address(uschar *, uschar *);
extern int ip_bind(int, int, uschar *, int);
extern int ip_connect(int, int, uschar *, int, int);
+extern int ip_connectedsocket(int, const uschar *, int, int,
+ int, host_item *, uschar **);
extern int ip_get_address_family(int);
extern void ip_keepalive(int, uschar *, BOOL);
extern int ip_recv(int, uschar *, int, int);
@@ -358,7 +360,7 @@ extern uschar *string_dequote(uschar **);
extern BOOL string_format(uschar *, int, const char *, ...) ALMOST_PRINTF(3,4);
extern uschar *string_format_size(int, uschar *);
extern int string_interpret_escape(uschar **);
-extern int string_is_ip_address(uschar *, int *);
+extern int string_is_ip_address(const uschar *, int *);
extern uschar *string_log_address(address_item *, BOOL, BOOL);
extern uschar *string_nextinlist(uschar **, int *, uschar *, int);
extern uschar *string_open_failed(int, const char *, ...) PRINTF_FUNCTION(2,3);
diff --git a/src/src/ip.c b/src/src/ip.c
index d6e4e7a..a820998 100644
--- a/src/src/ip.c
+++ b/src/src/ip.c
@@ -172,7 +172,7 @@ Arguments:
af AF_INET6 or AF_INET for the socket type
address the remote address, in text form
port the remote port
- timeout a timeout
+ timeout a timeout (zero for indefinite timeout)
Returns: 0 on success; -1 on failure, with errno set
*/
@@ -248,6 +248,105 @@ return -1;
}
+/* Create a socket and connect to host (name or number, ipv6 ok)
+ at one of port-range.
+Arguments:
+ type SOCK_DGRAM or SOCK_STREAM
+ af AF_INET6 or AF_INET for the socket type
+ address the remote address, in text form
+ portlo,porthi the remote port range
+ timeout a timeout
+ connhost if not NULL, host_item filled in with connection details
+ errstr pointer for allocated string on error
+
+Return:
+ socket fd, or -1 on failure (having allocated an error string)
+*/
+int
+ip_connectedsocket(int type, const uschar * hostname, int portlo, int porthi,
+ int timeout, host_item * connhost, uschar ** errstr)
+{
+int namelen, port;
+host_item shost;
+host_item *h;
+int af = 0, fd, fd4 = -1, fd6 = -1;
+
+shost.next = NULL;
+shost.address = NULL;
+shost.port = portlo;
+shost.mx = -1;
+
+namelen = Ustrlen(hostname);
+
+/* Anything enclosed in [] must be an IP address. */
+
+if (hostname[0] == '[' &&
+ hostname[namelen - 1] == ']')
+ {
+ uschar * host = string_copy(hostname);
+ host[namelen - 1] = 0;
+ host++;
+ if (string_is_ip_address(host, NULL) == 0)
+ {
+ *errstr = string_sprintf("malformed IP address \"%s\"", hostname);
+ return -1;
+ }
+ shost.name = shost.address = host;
+ }
+
+/* Otherwise check for an unadorned IP address */
+
+else if (string_is_ip_address(hostname, NULL) != 0)
+ shost.name = shost.address = string_copy(hostname);
+
+/* Otherwise lookup IP address(es) from the name */
+
+else
+ {
+ shost.name = string_copy(hostname);
+ if (host_find_byname(&shost, NULL, HOST_FIND_QUALIFY_SINGLE, NULL,
+ FALSE) != HOST_FOUND)
+ {
+ *errstr = string_sprintf("no IP address found for host %s", shost.name);
+ return -1;
+ }
+ }
+
+/* Try to connect to the server - test each IP till one works */
+
+for (h = &shost; h != NULL; h = h->next)
+ {
+ fd = (Ustrchr(h->address, ':') != 0)
+ ? (fd6 < 0) ? (fd6 = ip_socket(SOCK_STREAM, af = AF_INET6)) : fd6
+ : (fd4 < 0) ? (fd4 = ip_socket(SOCK_STREAM, af = AF_INET )) : fd4;
+
+ if (fd < 0)
+ {
+ *errstr = string_sprintf("failed to create socket: %s", strerror(errno));
+ goto bad;
+ }
+
+ for(port = portlo; port <= porthi; port++)
+ if (ip_connect(fd, af, h->address, port, timeout) == 0)
+ {
+ if (fd != fd6) close(fd6);
+ if (fd != fd4) close(fd4);
+ if (connhost) {
+ h->port = port;
+ *connhost = *h;
+ connhost->next = NULL;
+ }
+ return fd;
+ }
+ }
+
+*errstr = string_sprintf("failed to connect to "
+ "%s: couldn't connect to any host", hostname, strerror(errno));
+
+bad:
+ close(fd4); close(fd6); return -1;
+}
+
/*************************************************
* Set keepalive on a socket *
diff --git a/src/src/malware.c b/src/src/malware.c
index 2b4d282..01209d6 100644
--- a/src/src/malware.c
+++ b/src/src/malware.c
@@ -10,6 +10,30 @@
#include "exim.h"
#ifdef WITH_CONTENT_SCAN
+typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
+ M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
+typedef enum {MC_NONE, MC_TCP, MC_UNIX, MC_STRM} contype_t;
+static struct scan
+{
+ scanner_t scancode;
+ const uschar * name;
+ const uschar * options_default;
+ contype_t conn;
+} m_scans[] =
+{
+ { M_FPROTD, US"f-protd", US"localhost 10200-10204", MC_TCP },
+ { M_DRWEB, US"drweb", US"/usr/local/drweb/run/drwebd.sock", MC_STRM },
+ { M_AVES, US"aveserver", US"/var/run/aveserver", MC_UNIX },
+ { M_FSEC, US"fsecure", US"/var/run/.fsav", MC_UNIX },
+ { M_KAVD, US"kavdaemon", US"/var/run/AvpCtl", MC_UNIX },
+ { M_CMDL, US"cmdline", NULL, MC_NONE },
+ { M_SOPHIE, US"sophie", US"/var/run/sophie", MC_UNIX },
+ { M_CLAMD, US"clamd", US"/tmp/clamd", MC_NONE },
+ { M_SOCK, US"sock", US"/tmp/malware.sock", MC_STRM },
+ { M_MKSD, US"mksd", NULL, MC_NONE },
+ { -1, NULL, NULL, MC_NONE } /* end-marker */
+};
+
/* The maximum number of clamd servers that are supported in the configuration */
#define MAX_CLAMD_SERVERS 32
#define MAX_CLAMD_SERVERS_S "32"
@@ -23,12 +47,11 @@ typedef struct clamd_address_container {
} clamd_address_container;
/* declaration of private routines */
-static int mksd_scan_packed(int sock, uschar *scan_filename);
+static int mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename);
static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking);
-/* SHUT_WR seems to be undefined on Unixware? */
-#ifndef SHUT_WR
-#define SHUT_WR 1
+#ifndef nelements
+# define nelements(arr) (sizeof(arr) / sizeof(arr[0]))
#endif
@@ -44,20 +67,21 @@ static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
#define DERR_TIMEOUT (1<<9) /* scan timeout has run out */
#define DERR_BAD_CALL (1<<15) /* wrong command */
-/* Routine to check whether a system is big- or litte-endian.
+/* Routine to check whether a system is big- or little-endian.
Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
Needed for proper kavdaemon implementation. Sigh. */
#define BIG_MY_ENDIAN 0
#define LITTLE_MY_ENDIAN 1
-int test_byte_order(void);
-int test_byte_order() {
- short int word = 0x0001;
- char *byte = (char *) &word;
- return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
+static int test_byte_order(void);
+static inline int
+test_byte_order()
+{
+ short int word = 0x0001;
+ char *byte = (char *) &word;
+ return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
}
-uschar malware_name_buffer[256];
-int malware_ok = 0;
+BOOL malware_ok = FALSE;
/* Gross hacks for the -bmalware option; perhaps we should just create
the scan directory normally for that case, but look into rigging up the
@@ -78,21 +102,14 @@ Arguments:
Returns: Exim message processing code (OK, FAIL, DEFER, ...)
where true means malware was found (condition applies)
*/
-int malware(uschar **listptr) {
- uschar scan_filename[1024];
- BOOL fits;
+int
+malware(uschar **listptr)
+{
+ uschar * scan_filename;
int ret;
- fits = string_format(scan_filename, sizeof(scan_filename),
- CS"%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
- if (!fits)
- {
- av_failed = TRUE;
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware filename does not fit in buffer [malware()]");
- return DEFER;
- }
-
+ scan_filename = string_sprintf("%s/scan/%s/%s.eml",
+ spool_directory, message_id, message_id);
ret = malware_internal(listptr, scan_filename, FALSE);
if (ret == DEFER) av_failed = TRUE;
@@ -116,7 +133,8 @@ Returns: Exim message processing code (OK, FAIL, DEFER, ...)
where true means malware was found (condition applies)
*/
int
-malware_in_file(uschar *eml_filename) {
+malware_in_file(uschar *eml_filename)
+{
uschar *scan_options[2];
uschar message_id_buf[64];
int ret;
@@ -150,6 +168,142 @@ malware_in_file(uschar *eml_filename) {
}
+static inline int
+malware_errlog_defer(const uschar * str)
+{
+ log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
+ return DEFER;
+}
+
+static int
+m_errlog_defer(struct scan * scanent, const uschar * str)
+{
+ return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str));
+}
+static int
+m_errlog_defer_3(struct scan * scanent, const uschar * str,
+ int fd_to_close)
+{
+ (void) close(fd_to_close);
+ return m_errlog_defer(scanent, str);
+}
+
+/*************************************************/
+
+/* Only used by the Clamav code, which is working from a list of servers and
+uses the returned in_addr to get a second connection to the same system.
+*/
+static inline int
+m_tcpsocket(const uschar * hostname, unsigned int port,
+ host_item * host, uschar ** errstr)
+{
+ return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr);
+}
+
+static int
+m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
+{
+ int scan;
+ uschar hostname[256];
+ unsigned int portlow, porthigh;
+
+ /* extract host and port part */
+ scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
+ if ( scan != 3 ) {
+ if ( scan != 2 ) {
+ *errstr = string_sprintf("invalid socket '%s'", hostport);
+ return -1;
+ }
+ porthigh = portlow;
+ }
+
+ return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
+ 5, NULL, errstr);
+}
+
+static int
+m_unixsocket(const uschar * path, uschar ** errstr)
+{
+ int sock;
+ struct sockaddr_un server;
+
+ if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+ *errstr = US"can't open UNIX socket.";
+ return -1;
+ }
+
+ server.sun_family = AF_UNIX;
+ Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
+ server.sun_path[sizeof(server.sun_path)-1] = '\0';
+ if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
+ int err = errno;
+ (void)close(sock);
+ *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
+ path, strerror(err));
+ return -1;
+ }
+ return sock;
+}
+
+static inline int
+m_streamsocket(const uschar * spec, uschar ** errstr)
+{
+ return *spec == '/'
+ ? m_unixsocket(spec, errstr) : m_tcpsocket_fromdef(spec, errstr);
+}
+
+static int
+m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
+{
+ if (send(sock, buf, cnt, 0) < 0) {
+ int err = errno;
+ (void)close(sock);
+ *errstr = string_sprintf("unable to send to socket (%s): %s",
+ buf, strerror(err));
+ return -1;
+ }
+ return sock;
+}
+
+static const pcre *
+m_pcre_compile(const uschar * re, uschar ** errstr)
+{
+ const uschar * rerror;
+ int roffset;
+ const pcre * cre;
+
+ cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
+ if (!cre)
+ *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
+ re, rerror, roffset);
+ return cre;
+}
+
+uschar *
+m_pcre_exec(const pcre * cre, uschar * text)
+{
+ int ovector[10*3];
+ int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
+ ovector, nelements(ovector));
+ uschar * substr = NULL;
+ if (i >= 2) /* Got it */
+ pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
+ return substr;
+}
+
+static const pcre *
+m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
+{
+ const uschar * list_ele;
+ const pcre * cre = NULL;
+
+ if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
+ *errstr = US listerr;
+ else
+ cre = m_pcre_compile(CUS list_ele, errstr);
+ return cre;
+}
+
/*************************************************
* Scan content for malware *
*************************************************/
@@ -165,1728 +319,1218 @@ Arguments:
Returns: Exim message processing code (OK, FAIL, DEFER, ...)
where true means malware was found (condition applies)
*/
-static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking) {
+static int
+malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
+{
int sep = 0;
uschar *list = *listptr;
uschar *av_scanner_work = av_scanner;
uschar *scanner_name;
- uschar scanner_name_buffer[16];
uschar *malware_regex;
- uschar malware_regex_buffer[64];
uschar malware_regex_default[] = ".+";
unsigned long mbox_size;
FILE *mbox_file;
- int roffset;
const pcre *re;
- const uschar *rerror;
+ uschar * errstr;
+ struct scan * scanent;
+ const uschar * scanner_options;
+ int sock = -1;
/* make sure the eml mbox file is spooled up */
- mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL);
- if (mbox_file == NULL) {
- /* error while spooling */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: error while creating mbox spool file");
- return DEFER;
- };
+ if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
+ return malware_errlog_defer(US"error while creating mbox spool file");
+
/* none of our current scanners need the mbox
file as a stream, so we can close it right away */
(void)fclose(mbox_file);
/* extract the malware regex to match against from the option list */
- if ((malware_regex = string_nextinlist(&list, &sep,
- malware_regex_buffer,
- sizeof(malware_regex_buffer))) != NULL) {
+ if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0)))
+ return FAIL; /* empty means "don't match anything" */
- /* parse 1st option */
+ /* parse 1st option */
if ( (strcmpic(malware_regex,US"false") == 0) ||
- (Ustrcmp(malware_regex,"0") == 0) ) {
- /* explicitly no matching */
- return FAIL;
- };
-
- /* special cases (match anything except empty) */
- if ( (strcmpic(malware_regex,US"true") == 0) ||
- (Ustrcmp(malware_regex,"*") == 0) ||
- (Ustrcmp(malware_regex,"1") == 0) ) {
- malware_regex = malware_regex_default;
- };
- }
- else {
- /* empty means "don't match anything" */
- return FAIL;
- };
+ (Ustrcmp(malware_regex,"0") == 0) )
+ return FAIL; /* explicitly no matching */
+
+ /* special cases (match anything except empty) */
+ if ( (strcmpic(malware_regex,US"true") == 0) ||
+ (Ustrcmp(malware_regex,"*") == 0) ||
+ (Ustrcmp(malware_regex,"1") == 0) )
+ malware_regex = malware_regex_default;
/* Reset sep that is set by previous string_nextinlist() call */
sep = 0;
/* compile the regex, see if it works */
- re = pcre_compile(CS malware_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
- if (re == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: regular expression error in '%s': %s at offset %d", malware_regex, rerror, roffset);
- return DEFER;
- };
+ if (!(re = m_pcre_compile(malware_regex, &errstr)))
+ return malware_errlog_defer(errstr);
/* if av_scanner starts with a dollar, expand it first */
if (*av_scanner == '$') {
- av_scanner_work = expand_string(av_scanner);
- if (av_scanner_work == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: av_scanner starts with $, but expansion failed: %s", expand_string_message);
- return DEFER;
- }
- else {
- debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
- /* disable result caching in this case */
- malware_name = NULL;
- malware_ok = 0;
- };
+ if (!(av_scanner_work = expand_string(av_scanner)))
+ return malware_errlog_defer(
+ string_sprintf("av_scanner starts with $, but expansion failed: %s",
+ expand_string_message));
+
+ debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
+ /* disable result caching in this case */
+ malware_name = NULL;
+ malware_ok = FALSE;
}
- /* Do not scan twice. */
- if (malware_ok == 0) {
+ /* Do not scan twice (unless av_scanner is dynamic). */
+ if (!malware_ok) {
/* find the scanner type from the av_scanner option */
- if ((scanner_name = string_nextinlist(&av_scanner_work, &sep,
- scanner_name_buffer,
- sizeof(scanner_name_buffer))) == NULL) {
- /* no scanner given */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: av_scanner configuration variable is empty");
- return DEFER;
- };
-
- /* "f-protd" scanner type ----------------------------------------------- */
- if (strcmpic(scanner_name, US"f-protd") == 0) {
- uschar *fp_options, *fp_scan_option;
- uschar fp_scan_option_buffer[1024];
- uschar fp_options_buffer[1024];
- uschar fp_options_default[] = "localhost 10200-10204";
- uschar hostname[256];
- unsigned int port, portlow, porthigh, connect_ok=0, detected=0, par_count = 0;
- struct hostent *he;
- struct in_addr in;
- int sock;
- uschar scanrequest[2048], buf[32768], *strhelper, *strhelper2;
-
- if ((fp_options = string_nextinlist(&av_scanner_work, &sep,
- fp_options_buffer, sizeof(fp_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- fp_options = fp_options_default;
- };
-
- /* extract host and port part */
- if ( sscanf(CS fp_options, "%s %u-%u", hostname, &portlow, &porthigh) != 3 ) {
- if ( sscanf(CS fp_options, "%s %u", hostname, &portlow) != 2 ) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: f-protd: invalid socket '%s'", fp_options);
- return DEFER;
- }
- porthigh = portlow;
- }
-
- /* Lookup the host */
- if((he = gethostbyname(CS hostname)) == 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: f-protd: failed to lookup host '%s'", hostname);
- return DEFER;
- }
-
- in = *(struct in_addr *) he->h_addr_list[0];
- port = portlow;
-
-
- /* Open the f-protd TCP socket */
- if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: f-protd: unable to acquire socket (%s)",
- strerror(errno));
- return DEFER;
- }
-
- /* Try to connect to all portslow-high until connection is established */
- for (port = portlow; !connect_ok && port < porthigh; port++) {
- if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) >= 0) {
- connect_ok = 1;
- }
- }
-
- if ( !connect_ok ) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: f-protd: connection to %s, port %u-%u failed (%s)",
- inet_ntoa(in), portlow, porthigh, strerror(errno));
- (void)close(sock);
- return DEFER;
- }
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
- (void)string_format(scanrequest, 1024, CS"GET %s", eml_filename);
-
- while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
- fp_scan_option_buffer, sizeof(fp_scan_option_buffer))) != NULL) {
- if ( par_count ) {
- Ustrcat(scanrequest, "%20");
- } else {
- Ustrcat(scanrequest, "?");
- }
- Ustrcat(scanrequest, fp_scan_option);
- par_count++;
- }
- Ustrcat(scanrequest, " HTTP/1.0\r\n\r\n");
-
- /* send scan request */
- if (send(sock, &scanrequest, Ustrlen(scanrequest)+1, 0) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: f-protd: unable to send command to socket (%s)", scanrequest);
- return DEFER;
- }
-
- /* We get a lot of empty lines, so we need this hack to check for any data at all */
- while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
- if ( recv_line(sock, buf, 32768) > 0) {
- if ( Ustrstr(buf, US"<detected type=\"") != NULL ) {
- detected = 1;
- } else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
- if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
- *strhelper2 = '\0';
- Ustrcpy(malware_name_buffer, strhelper + 6);
- }
- } else if ( Ustrstr(buf, US"<summary code=\"") ) {
- if ( Ustrstr(buf, US"<summary code=\"11\">") ) {
- malware_name = malware_name_buffer;
- } else {
- malware_name = NULL;
- }
- }
- }
- }
- (void)close(sock);
- }
- /* "drweb" scanner type ----------------------------------------------- */
- /* v0.1 - added support for tcp sockets */
- /* v0.0 - initial release -- support for unix sockets */
- else if (strcmpic(scanner_name,US"drweb") == 0) {
- uschar *drweb_options;
- uschar drweb_options_buffer[1024];
- uschar drweb_options_default[] = "/usr/local/drweb/run/drwebd.sock";
- struct sockaddr_un server;
- int sock, result, ovector[30];
- unsigned int port, fsize;
- uschar tmpbuf[1024], *drweb_fbuf;
- uschar drweb_match_string[128];
- int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
- drweb_vnum, drweb_slen, drweb_fin = 0x0000;
- unsigned long bread;
- uschar hostname[256];
- struct hostent *he;
- struct in_addr in;
- pcre *drweb_re;
-
- if ((drweb_options = string_nextinlist(&av_scanner_work, &sep,
- drweb_options_buffer, sizeof(drweb_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- drweb_options = drweb_options_default;
- };
-
- if (*drweb_options != '/') {
-
- /* extract host and port part */
- if( sscanf(CS drweb_options, "%s %u", hostname, &port) != 2 ) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: invalid socket '%s'", drweb_options);
- return DEFER;
- }
-
- /* Lookup the host */
- if((he = gethostbyname(CS hostname)) == 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: failed to lookup host '%s'", hostname);
- return DEFER;
- }
-
- in = *(struct in_addr *) he->h_addr_list[0];
-
- /* Open the drwebd TCP socket */
- if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to acquire socket (%s)",
- strerror(errno));
- return DEFER;
- }
-
- if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: connection to %s, port %u failed (%s)",
- inet_ntoa(in), port, strerror(errno));
- return DEFER;
- }
-
- /* prepare variables */
- drweb_cmd = htonl(DRWEBD_SCAN_CMD);
- drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
-
- /* calc file size */
- drweb_fd = open(CS eml_filename, O_RDONLY);
- if (drweb_fd == -1) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: can't open spool file %s: %s",
- eml_filename, strerror(errno));
- return DEFER;
- }
- fsize = lseek(drweb_fd, 0, SEEK_END);
- if (fsize == -1) {
- (void)close(sock);
- (void)close(drweb_fd);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: can't seek spool file %s: %s",
- eml_filename, strerror(errno));
- return DEFER;
- }
- drweb_slen = htonl(fsize);
- lseek(drweb_fd, 0, SEEK_SET);
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s %u]\n",
- scanner_name, hostname, port);
-
- /* send scan request */
- if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
- (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
- (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
- (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
- (void)close(sock);
- (void)close(drweb_fd);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options);
- return DEFER;
- }
-
- drweb_fbuf = (uschar *) malloc (fsize);
- if (!drweb_fbuf) {
- (void)close(sock);
- (void)close(drweb_fd);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to allocate memory %u for file (%s)",
- fsize, eml_filename);
- return DEFER;
- }
-
- result = read (drweb_fd, drweb_fbuf, fsize);
- if (result == -1) {
- (void)close(sock);
- (void)close(drweb_fd);
- free(drweb_fbuf);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: can't read spool file %s: %s",
- eml_filename, strerror(errno));
- return DEFER;
- }
- (void)close(drweb_fd);
-
- /* send file body to socket */
- if (send(sock, drweb_fbuf, fsize, 0) < 0) {
- (void)close(sock);
- free(drweb_fbuf);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to send file body to socket (%s)", drweb_options);
- return DEFER;
- }
- (void)close(drweb_fd);
- }
- else {
- /* open the drwebd UNIX socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: can't open UNIX socket");
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, drweb_options);
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to connect to socket (%s). errno=%d", drweb_options, errno);
- return DEFER;
- }
-
- /* prepare variables */
- drweb_cmd = htonl(DRWEBD_SCAN_CMD);
- drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
- drweb_slen = htonl(Ustrlen(eml_filename));
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
- scanner_name, drweb_options);
-
- /* send scan request */
- if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
- (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
- (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
- (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
- (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to send commands to socket (%s)", drweb_options);
- return DEFER;
- }
- }
-
- /* wait for result */
- if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to read return code");
- return DEFER;
- }
- drweb_rc = ntohl(drweb_rc);
-
- if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: unable to read the number of viruses");
- return DEFER;
- }
- drweb_vnum = ntohl(drweb_vnum);
-
- /* "virus(es) found" if virus number is > 0 */
- if (drweb_vnum)
- {
- int i;
- uschar pre_malware_nb[256];
-
- malware_name = malware_name_buffer;
-
- /* setup default virus name */
- Ustrcpy(malware_name_buffer,"unknown");
-
- /* read and concatenate virus names into one string */
- for (i=0;i<drweb_vnum;i++)
+ if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
+ return malware_errlog_defer(US"av_scanner configuration variable is empty");
+
+ for (scanent = m_scans; ; scanent++) {
+ if (!scanent->name)
+ return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
+ scanner_name));
+ if (strcmpic(scanner_name, US scanent->name) != 0)
+ continue;
+ if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
+ scanner_options = scanent->options_default;
+ if (scanent->conn == MC_NONE)
+ break;
+ switch(scanent->conn)
{
- /* read the size of report */
- if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: cannot read report size");
- return DEFER;
- };
- drweb_slen = ntohl(drweb_slen);
-
- /* read report body */
- if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: cannot read report string");
- return DEFER;
- };
- tmpbuf[drweb_slen] = '\0';
-
- /* set up match regex, depends on retcode */
- Ustrcpy(drweb_match_string, "infected\\swith\\s*(.+?)$");
-
- drweb_re = pcre_compile( CS drweb_match_string,
- PCRE_COPT,
- (const char **)&rerror,
- &roffset,
- NULL );
-
- /* try matcher on the line, grab substring */
- result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30);
- if (result >= 2) {
- pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS pre_malware_nb, 255);
- }
- /* the first name we just copy to malware_name */
- if (i==0)
- Ustrcpy(CS malware_name_buffer, CS pre_malware_nb);
- else {
- /* concatenate each new virus name to previous */
- int slen = Ustrlen(malware_name_buffer);
- if (slen < (slen+Ustrlen(pre_malware_nb))) {
- Ustrcat(malware_name_buffer, "/");
- Ustrcat(malware_name_buffer, pre_malware_nb);
- }
- }
+ case MC_TCP: sock = m_tcpsocket_fromdef(scanner_options, &errstr); break;
+ case MC_UNIX: sock = m_unixsocket(scanner_options, &errstr); break;
+ case MC_STRM: sock = m_streamsocket(scanner_options, &errstr); break;
}
+ if (sock < 0)
+ return m_errlog_defer(scanent, errstr);
+ break;
}
- else {
- const char *drweb_s = NULL;
-
- if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
- if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
- if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
- if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
- /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
- * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
- * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
- * and others are ignored */
- if (drweb_s) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: drweb: drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s);
- (void)close(sock);
- return DEFER;
- }
- /* no virus found */
- malware_name = NULL;
- };
- (void)close(sock);
- }
- /* ----------------------------------------------------------------------- */
- else if (strcmpic(scanner_name,US"aveserver") == 0) {
- uschar *kav_options;
- uschar kav_options_buffer[1024];
- uschar kav_options_default[] = "/var/run/aveserver";
- uschar buf[32768];
- struct sockaddr_un server;
- int sock;
- int result;
-
- if ((kav_options = string_nextinlist(&av_scanner_work, &sep,
- kav_options_buffer,
- sizeof(kav_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- kav_options = kav_options_default;
- };
-
- /* open the aveserver socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: can't open UNIX socket.");
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, kav_options);
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to connect to aveserver UNIX socket (%s). errno=%d", kav_options, errno);
- return DEFER;
- }
-
- /* read aveserver's greeting and see if it is ready (2xx greeting) */
- recv_line(sock, buf, 32768);
-
- if (buf[0] != '2') {
- /* aveserver is having problems */
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: aveserver is unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") );
- return DEFER;
- };
- /* prepare our command */
- (void)string_format(buf, 32768, "SCAN bPQRSTUW %s\r\n", eml_filename);
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
-
- /* and send it */
- if (send(sock, buf, Ustrlen(buf), 0) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options);
- return DEFER;
- }
-
- malware_name = NULL;
- result = 0;
- /* read response lines, find malware name and final response */
- while (recv_line(sock, buf, 32768) > 0) {
- debug_printf("aveserver: %s\n", buf);
- if (buf[0] == '2') {
- break;
- } else if (buf[0] == '5') {
- /* aveserver is having problems */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to scan file %s (Responded: %s).",
- eml_filename, buf);
- result = DEFER;
- break;
- } else if (Ustrncmp(buf,"322",3) == 0) {
- uschar *p = Ustrchr(&buf[4],' ');
- *p = '\0';
- Ustrcpy(malware_name_buffer,&buf[4]);
- malware_name = malware_name_buffer;
- };
- }
-
- /* prepare our command */
- (void)string_format(buf, 32768, "quit\r\n");
-
- /* and send it */
- if (send(sock, buf, Ustrlen(buf), 0) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write to aveserver UNIX socket (%s)", kav_options);
- return DEFER;
- }
-
- /* read aveserver's greeting and see if it is ready (2xx greeting) */
- recv_line(sock, buf, 32768);
-
- if (buf[0] != '2') {
- /* aveserver is having problems */
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to quit aveserver dialogue (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") );
- return DEFER;
- };
-
- (void)close(sock);
+ switch (scanent->scancode) {
+ case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
+ {
+ uschar *fp_scan_option;
+ unsigned int detected=0, par_count=0;
+ uschar * scanrequest;
+ uschar buf[32768], *strhelper, *strhelper2;
+ uschar * malware_name_internal = NULL;
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
+ scanrequest = string_sprintf("GET %s", eml_filename);
+
+ while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
+ NULL, 0))) {
+ scanrequest = string_sprintf("%s%s%s", scanrequest,
+ par_count ? "%20" : "?", fp_scan_option);
+ par_count++;
+ }
+ scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
+
+ /* send scan request */
+ if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ /* We get a lot of empty lines, so we need this hack to check for any data at all */
+ while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
+ if ( recv_line(sock, buf, sizeof(buf)) > 0) {
+ if ( Ustrstr(buf, US"<detected type=\"") != NULL )
+ detected = 1;
+ else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
+ if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
+ *strhelper2 = '\0';
+ malware_name_internal = string_copy(strhelper+6);
+ }
+ } else if ( Ustrstr(buf, US"<summary code=\"") )
+ malware_name = Ustrstr(buf, US"<summary code=\"11\">")
+ ? malware_name_internal : NULL;
+ }
+ }
+ break;
+ } /* f-protd */
- if (result == DEFER) return DEFER;
- }
- /* "fsecure" scanner type ------------------------------------------------- */
- else if (strcmpic(scanner_name,US"fsecure") == 0) {
- uschar *fsecure_options;
- uschar fsecure_options_buffer[1024];
- uschar fsecure_options_default[] = "/var/run/.fsav";
- struct sockaddr_un server;
- int sock, i, j, bread = 0;
- uschar file_name[1024];
- uschar av_buffer[1024];
- pcre *fs_inf;
- static uschar *cmdoptions[] = { US"CONFIGURE\tARCHIVE\t1\n",
- US"CONFIGURE\tTIMEOUT\t0\n",
- US"CONFIGURE\tMAXARCH\t5\n",
- US"CONFIGURE\tMIME\t1\n" };
-
- malware_name = NULL;
- if ((fsecure_options = string_nextinlist(&av_scanner_work, &sep,
- fsecure_options_buffer,
- sizeof(fsecure_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- fsecure_options = fsecure_options_default;
- };
-
- /* open the fsecure socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to open fsecure socket %s (%s)",
- fsecure_options, strerror(errno));
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, fsecure_options);
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to connect to fsecure socket %s (%s)",
- fsecure_options, strerror(errno));
- return DEFER;
- }
+ case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
+ /* v0.1 - added support for tcp sockets */
+ /* v0.0 - initial release -- support for unix sockets */
+ {
+ int result;
+ unsigned int fsize;
+ uschar * tmpbuf, *drweb_fbuf;
+ int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
+ drweb_vnum, drweb_slen, drweb_fin = 0x0000;
+ unsigned long bread;
+ const pcre *drweb_re;
+
+ /* prepare variables */
+ drweb_cmd = htonl(DRWEBD_SCAN_CMD);
+ drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
+
+ if (*scanner_options != '/') {
+
+ /* calc file size */
+ if ((drweb_fd = open(CS eml_filename, O_RDONLY)) == -1)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't open spool file %s: %s",
+ eml_filename, strerror(errno)),
+ sock);
+
+ if ((fsize = lseek(drweb_fd, 0, SEEK_END)) == -1) {
+ int err = errno;
+ (void)close(drweb_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't seek spool file %s: %s",
+ eml_filename, strerror(err)),
+ sock);
+ }
+ drweb_slen = htonl(fsize);
+ lseek(drweb_fd, 0, SEEK_SET);
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
+ scanner_name, scanner_options);
+
+ /* send scan request */
+ if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
+ (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
+ (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
+ (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
+ (void)close(drweb_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send commands to socket (%s)", scanner_options),
+ sock);
+ }
+
+ if (!(drweb_fbuf = (uschar *) malloc (fsize))) {
+ (void)close(drweb_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to allocate memory %u for file (%s)",
+ fsize, eml_filename),
+ sock);
+ }
+
+ if ((result = read (drweb_fd, drweb_fbuf, fsize)) == -1) {
+ int err = errno;
+ (void)close(drweb_fd);
+ free(drweb_fbuf);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't read spool file %s: %s",
+ eml_filename, strerror(err)),
+ sock);
+ }
+ (void)close(drweb_fd);
+
+ /* send file body to socket */
+ if (send(sock, drweb_fbuf, fsize, 0) < 0) {
+ free(drweb_fbuf);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send file body to socket (%s)", scanner_options),
+ sock);
+ }
+ (void)close(drweb_fd);
+
+ } else {
+
+ drweb_slen = htonl(Ustrlen(eml_filename));
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
+ scanner_name, scanner_options);
+
+ /* send scan request */
+ if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
+ (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
+ (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
+ (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
+ (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0))
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send commands to socket (%s)", scanner_options),
+ sock);
+ }
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
- scanner_name, fsecure_options);
-
- /* pass options */
- memset(av_buffer, 0, sizeof(av_buffer));
- for (i=0; i != 4; i++) {
- /* debug_printf("send option \"%s\"",cmdoptions[i]); */
- if (write(sock, cmdoptions[i], Ustrlen(cmdoptions[i])) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write fsecure option %d to %s (%s)",
- i, fsecure_options, strerror(errno));
- return DEFER;
- };
-
- bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
- if (bread >0) av_buffer[bread]='\0';
- if (bread < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to read fsecure answer %d (%s)", i, strerror(errno));
- return DEFER;
- };
- for (j=0;j<bread;j++) if((av_buffer[j]=='\r')||(av_buffer[j]=='\n')) av_buffer[j] ='@';
- /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
- /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
- };
-
- /* pass the mailfile to fsecure */
- (void)string_format(file_name,1024,"SCAN\t%s\n", eml_filename);
- /* debug_printf("send scan %s",file_name); */
- if (write(sock, file_name, Ustrlen(file_name)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write fsecure scan to %s (%s)",
- fsecure_options, strerror(errno));
- return DEFER;
- };
-
- /* set up match */
- /* todo also SUSPICION\t */
- fs_inf = pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", PCRE_COPT, (const char **)&rerror, &roffset, NULL);
-
- /* read report, linewise */
- do {
- int ovector[30];
- i = 0;
- memset(av_buffer, 0, sizeof(av_buffer));
- do {
- bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
- if (bread < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to read fsecure result (%s)", strerror(errno));
- return DEFER;
- };
- i++;
- }
- while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
- av_buffer[i-1] = '\0';
- /* debug_printf("got line \"%s\"\n",av_buffer); */
-
- /* Really search for virus again? */
- if (malware_name == NULL) {
- /* try matcher on the line, grab substring */
- i = pcre_exec(fs_inf, NULL, CS av_buffer, Ustrlen(av_buffer), 0, 0, ovector, 30);
- if (i >= 2) {
- /* Got it */
- pcre_copy_substring(CS av_buffer, ovector, i, 1, CS malware_name_buffer, 255);
- malware_name = malware_name_buffer;
- };
- };
- }
- while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
- (void)close(sock);
- }
- /* ----------------------------------------------------------------------- */
-
- /* "kavdaemon" scanner type ------------------------------------------------ */
- else if (strcmpic(scanner_name,US"kavdaemon") == 0) {
- uschar *kav_options;
- uschar kav_options_buffer[1024];
- uschar kav_options_default[] = "/var/run/AvpCtl";
- struct sockaddr_un server;
- int sock;
- time_t t;
- uschar tmpbuf[1024];
- uschar scanrequest[1024];
- uschar kav_match_string[128];
- int kav_rc;
- unsigned long kav_reportlen, bread;
- pcre *kav_re;
- uschar *p;
- int fits;
-
- if ((kav_options = string_nextinlist(&av_scanner_work, &sep,
- kav_options_buffer,
- sizeof(kav_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- kav_options = kav_options_default;
- };
-
- /* open the kavdaemon socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: can't open UNIX socket.");
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, kav_options);
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to connect to kavdaemon UNIX socket (%s). errno=%d", kav_options, errno);
- return DEFER;
- }
+ /* wait for result */
+ if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc)))
+ return m_errlog_defer_3(scanent,
+ US"unable to read return code", sock);
+ drweb_rc = ntohl(drweb_rc);
+
+ if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum)))
+ return m_errlog_defer_3(scanent,
+ US"unable to read the number of viruses", sock);
+ drweb_vnum = ntohl(drweb_vnum);
+
+ /* "virus(es) found" if virus number is > 0 */
+ if (drweb_vnum) {
+ int i;
+
+ /* setup default virus name */
+ malware_name = US"unknown";
+
+ /* set up match regex */
+ drweb_re = m_pcre_compile(US"infected\\swith\\s*(.+?)$", &errstr);
+
+ /* read and concatenate virus names into one string */
+ for (i=0;i<drweb_vnum;i++)
+ {
+ int size = 0, off = 0, ovector[10*3];
+ /* read the size of report */
+ if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen)))
+ return m_errlog_defer_3(scanent,
+ US"cannot read report size", sock);
+ drweb_slen = ntohl(drweb_slen);
+ tmpbuf = store_get(drweb_slen);
+
+ /* read report body */
+ if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen)
+ return m_errlog_defer_3(scanent,
+ US"cannot read report string", sock);
+ tmpbuf[drweb_slen] = '\0';
+
+ /* try matcher on the line, grab substring */
+ result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
+ ovector, nelements(ovector));
+ if (result >= 2) {
+ const char * pre_malware_nb;
+
+ pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
+
+ if (i==0) /* the first name we just copy to malware_name */
+ malware_name = string_append(NULL, &size, &off,
+ 1, pre_malware_nb);
+
+ else /* concatenate each new virus name to previous */
+ malware_name = string_append(malware_name, &size, &off,
+ 2, "/", pre_malware_nb);
+
+ pcre_free_substring(pre_malware_nb);
+ }
+ }
+ }
+ else {
+ const char *drweb_s = NULL;
+
+ if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
+ if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
+ if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
+ if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
+ /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
+ * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
+ * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
+ * and others are ignored */
+ if (drweb_s)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s),
+ sock);
+
+ /* no virus found */
+ malware_name = NULL;
+ }
+ break;
+ } /* drweb */
- /* get current date and time, build scan request */
- time(&t);
- /* pdp note: before the eml_filename parameter, this scanned the
- directory; not finding documentation, so we'll strip off the directory.
- The side-effect is that the test framework scanning may end up in
- scanning more than was requested, but for the normal interface, this is
- fine. */
- strftime(CS tmpbuf, sizeof(tmpbuf), "<0>%d %b %H:%M:%S:%%s", localtime(&t));
- fits = string_format(scanrequest, 1024,CS tmpbuf, eml_filename);
- if (!fits) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware filename does not fit in buffer [malware_internal() kavdaemon]");
- }
- p = Ustrrchr(scanrequest, '/');
- if (p)
- *p = '\0';
+ case M_AVES: /* "aveserver" scanner type -------------------------------- */
+ {
+ uschar buf[32768];
+ int result;
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
- scanner_name, kav_options);
+ /* read aveserver's greeting and see if it is ready (2xx greeting) */
+ recv_line(sock, buf, sizeof(buf));
- /* send scan request */
- if (send(sock, scanrequest, Ustrlen(scanrequest)+1, 0) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write to kavdaemon UNIX socket (%s)", kav_options);
- return DEFER;
- }
+ if (buf[0] != '2') /* aveserver is having problems */
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unavailable (Responded: %s).",
+ ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
+ sock);
- /* wait for result */
- if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to read 2 bytes from kavdaemon socket.");
- return DEFER;
- }
+ /* prepare our command */
+ (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
+ eml_filename);
- /* get errorcode from one nibble */
- if (test_byte_order() == LITTLE_MY_ENDIAN) {
- kav_rc = tmpbuf[0] & 0x0F;
- }
- else {
- kav_rc = tmpbuf[1] & 0x0F;
- };
-
- /* improper kavdaemon configuration */
- if ( (kav_rc == 5) || (kav_rc == 6) ) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: please reconfigure kavdaemon to NOT disinfect or remove infected files.");
- return DEFER;
- };
-
- if (kav_rc == 1) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: kavdaemon reported 'scanning not completed' (code 1).");
- return DEFER;
- };
-
- if (kav_rc == 7) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: kavdaemon reported 'kavdaemon damaged' (code 7).");
- return DEFER;
- };
-
- /* code 8 is not handled, since it is ambigous. It appears mostly on
- bounces where part of a file has been cut off */
-
- /* "virus found" return codes (2-4) */
- if ((kav_rc > 1) && (kav_rc < 5)) {
- int report_flag = 0;
-
- /* setup default virus name */
- Ustrcpy(malware_name_buffer,"unknown");
- malware_name = malware_name_buffer;
-
- if (test_byte_order() == LITTLE_MY_ENDIAN) {
- report_flag = tmpbuf[1];
- }
- else {
- report_flag = tmpbuf[0];
- };
-
- /* read the report, if available */
- if( report_flag == 1 ) {
- /* read report size */
- if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: cannot read report size from kavdaemon");
- return DEFER;
- };
-
- /* it's possible that avp returns av_buffer[1] == 1 but the
- reportsize is 0 (!?) */
- if (kav_reportlen > 0) {
- /* set up match regex, depends on retcode */
- if( kav_rc == 3 )
- Ustrcpy(kav_match_string, "suspicion:\\s*(.+?)\\s*$");
- else
- Ustrcpy(kav_match_string, "infected:\\s*(.+?)\\s*$");
-
- kav_re = pcre_compile( CS kav_match_string,
- PCRE_COPT,
- (const char **)&rerror,
- &roffset,
- NULL );
-
- /* read report, linewise */
- while (kav_reportlen > 0) {
- int result = 0;
- int ovector[30];
-
- bread = 0;
- while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
- kav_reportlen--;
- if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
- bread++;
- };
- bread++;
- tmpbuf[bread] = '\0';
-
- /* try matcher on the line, grab substring */
- result = pcre_exec(kav_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0, ovector, 30);
- if (result >= 2) {
- pcre_copy_substring(CS tmpbuf, ovector, result, 1, CS malware_name_buffer, 255);
- break;
- };
- };
- };
- };
- }
- else {
- /* no virus found */
- malware_name = NULL;
- };
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
- (void)close(sock);
- }
- /* ----------------------------------------------------------------------- */
-
-
- /* "cmdline" scanner type ------------------------------------------------ */
- else if (strcmpic(scanner_name,US"cmdline") == 0) {
- uschar *cmdline_scanner;
- uschar cmdline_scanner_buffer[1024];
- uschar *cmdline_trigger;
- uschar cmdline_trigger_buffer[1024];
- const pcre *cmdline_trigger_re;
- uschar *cmdline_regex;
- uschar cmdline_regex_buffer[1024];
- const pcre *cmdline_regex_re;
- uschar file_name[1024];
- uschar commandline[1024];
- void (*eximsigchld)(int);
- void (*eximsigpipe)(int);
- FILE *scanner_out = NULL;
- FILE *scanner_record = NULL;
- uschar linebuffer[32767];
- int trigger = 0;
- int result;
- int ovector[30];
- uschar *p;
- BOOL fits;
-
- /* find scanner command line */
- if ((cmdline_scanner = string_nextinlist(&av_scanner_work, &sep,
- cmdline_scanner_buffer,
- sizeof(cmdline_scanner_buffer))) == NULL) {
- /* no command line supplied */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: missing commandline specification for cmdline scanner type.");
- return DEFER;
- };
-
- /* find scanner output trigger */
- if ((cmdline_trigger = string_nextinlist(&av_scanner_work, &sep,
- cmdline_trigger_buffer,
- sizeof(cmdline_trigger_buffer))) == NULL) {
- /* no trigger regex supplied */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: missing trigger specification for cmdline scanner type.");
- return DEFER;
- };
-
- /* precompile trigger regex */
- cmdline_trigger_re = pcre_compile(CS cmdline_trigger, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
- if (cmdline_trigger_re == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_trigger, rerror, roffset);
- return DEFER;
- };
-
- /* find scanner name regex */
- if ((cmdline_regex = string_nextinlist(&av_scanner_work, &sep,
- cmdline_regex_buffer,
- sizeof(cmdline_regex_buffer))) == NULL) {
- /* no name regex supplied */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: missing virus name regex specification for cmdline scanner type.");
- return DEFER;
- };
-
- /* precompile name regex */
- cmdline_regex_re = pcre_compile(CS cmdline_regex, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
- if (cmdline_regex_re == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: regular expression error in '%s': %s at offset %d", cmdline_regex, rerror, roffset);
- return DEFER;
- };
-
- /* prepare scanner call; despite the naming, file_name holds a directory
- name which is documented as the value given to %s. */
- if (Ustrlen(eml_filename) > sizeof(file_name) - 1)
- {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware filename does not fit in buffer [malware_internal() cmdline]");
- return DEFER;
- }
- Ustrcpy(file_name, eml_filename);
- p = Ustrrchr(file_name, '/');
- if (p)
- *p = '\0';
- fits = string_format(commandline, sizeof(commandline), CS cmdline_scanner, file_name);
- if (!fits)
- {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "cmdline scanner command-line does not fit in buffer");
- return DEFER;
- }
-
- /* redirect STDERR too */
- if (Ustrlen(commandline) + 5 > sizeof(commandline))
- {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "cmdline scanner command-line does not fit in buffer (STDERR redirect)");
- return DEFER;
- }
- Ustrcat(commandline," 2>&1");
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
-
- /* store exims signal handlers */
- eximsigchld = signal(SIGCHLD,SIG_DFL);
- eximsigpipe = signal(SIGPIPE,SIG_DFL);
-
- scanner_out = popen(CS commandline,"r");
- if (scanner_out == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: calling cmdline scanner (%s) failed: %s.", commandline, strerror(errno));
- signal(SIGCHLD,eximsigchld);
- signal(SIGPIPE,eximsigpipe);
- return DEFER;
- };
-
- (void)string_format(file_name,1024,"%s/scan/%s/%s_scanner_output", spool_directory, message_id, message_id);
- scanner_record = modefopen(file_name,"wb",SPOOL_MODE);
-
- if (scanner_record == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: opening scanner output file (%s) failed: %s.", file_name, strerror(errno));
- pclose(scanner_out);
- signal(SIGCHLD,eximsigchld);
- signal(SIGPIPE,eximsigpipe);
- return DEFER;
- };
-
- /* look for trigger while recording output */
- while(fgets(CS linebuffer,32767,scanner_out) != NULL) {
- if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
- /* short write */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: short write on scanner output file (%s).", file_name);
- pclose(scanner_out);
- signal(SIGCHLD,eximsigchld);
- signal(SIGPIPE,eximsigpipe);
- return DEFER;
- };
- /* try trigger match */
- if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
- trigger = 1;
- };
-
- (void)fclose(scanner_record);
- pclose(scanner_out);
- signal(SIGCHLD,eximsigchld);
- signal(SIGPIPE,eximsigpipe);
-
- if (trigger) {
- /* setup default virus name */
- Ustrcpy(malware_name_buffer,"unknown");
- malware_name = malware_name_buffer;
-
- /* re-open the scanner output file, look for name match */
- scanner_record = fopen(CS file_name,"rb");
- while(fgets(CS linebuffer,32767,scanner_record) != NULL) {
- /* try match */
- result = pcre_exec(cmdline_regex_re, NULL, CS linebuffer, Ustrlen(linebuffer), 0, 0, ovector, 30);
- if (result >= 2) {
- pcre_copy_substring(CS linebuffer, ovector, result, 1, CS malware_name_buffer, 255);
- };
- };
- (void)fclose(scanner_record);
- }
- else {
- /* no virus found */
- malware_name = NULL;
- };
- }
- /* ----------------------------------------------------------------------- */
-
-
- /* "sophie" scanner type ------------------------------------------------- */
- else if (strcmpic(scanner_name,US"sophie") == 0) {
- uschar *sophie_options;
- uschar sophie_options_buffer[1024];
- uschar sophie_options_default[] = "/var/run/sophie";
- int bread = 0;
- struct sockaddr_un server;
- int sock, len;
- uschar *p;
- uschar file_name[1024];
- uschar av_buffer[1024];
-
- if ((sophie_options = string_nextinlist(&av_scanner_work, &sep,
- sophie_options_buffer,
- sizeof(sophie_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- sophie_options = sophie_options_default;
- }
+ /* and send it */
+ if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
- /* open the sophie socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: can't open UNIX socket.");
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, sophie_options);
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to connect to sophie UNIX socket (%s). errno=%d", sophie_options, errno);
- return DEFER;
- }
+ malware_name = NULL;
+ result = 0;
+ /* read response lines, find malware name and final response */
+ while (recv_line(sock, buf, sizeof(buf)) > 0) {
+ debug_printf("aveserver: %s\n", buf);
+ if (buf[0] == '2')
+ break;
+ if (buf[0] == '5') { /* aveserver is having problems */
+ result = m_errlog_defer(scanent,
+ string_sprintf("unable to scan file %s (Responded: %s).",
+ eml_filename, buf));
+ break;
+ } else if (Ustrncmp(buf,"322",3) == 0) {
+ uschar *p = Ustrchr(&buf[4],' ');
+ *p = '\0';
+ malware_name = string_copy(&buf[4]);
+ }
+ }
- /* pass the scan directory to sophie */
- len = Ustrlen(eml_filename) + 1;
- if (len > sizeof(file_name))
- {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware filename does not fit in buffer [malware_internal() sophie]");
- return DEFER;
- }
- memcpy(file_name, eml_filename, len);
- p = Ustrrchr(file_name, '/');
- if (p)
- *p = '\0';
+ /* and send it */
+ if (m_sock_send(sock, US"quit\r\n", 6, &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
- scanner_name, sophie_options);
+ /* read aveserver's greeting and see if it is ready (2xx greeting) */
+ recv_line(sock, buf, sizeof(buf));
- if ( write(sock, file_name, Ustrlen(file_name)) < 0
- || write(sock, "\n", 1) != 1
- ) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write to sophie UNIX socket (%s)", sophie_options);
- return DEFER;
- }
+ if (buf[0] != '2') /* aveserver is having problems */
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to quit dialogue (Responded: %s).",
+ ((buf[0] != 0) ? buf : (uschar *)"nothing") ),
+ sock);
- /* wait for result */
- memset(av_buffer, 0, sizeof(av_buffer));
- if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to read from sophie UNIX socket (%s)", sophie_options);
- return DEFER;
- }
+ if (result == DEFER) {
+ (void)close(sock);
+ return DEFER;
+ }
+ break;
+ } /* aveserver */
- (void)close(sock);
+ case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
+ {
+ int i, j, bread = 0;
+ uschar * file_name;
+ uschar av_buffer[1024];
+ const pcre * fs_inf;
+ static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
+ US"CONFIGURE\tTIMEOUT\t0\n",
+ US"CONFIGURE\tMAXARCH\t5\n",
+ US"CONFIGURE\tMIME\t1\n" };
- /* infected ? */
- if (av_buffer[0] == '1') {
- if (Ustrchr(av_buffer, '\n')) *Ustrchr(av_buffer, '\n') = '\0';
- Ustrcpy(malware_name_buffer,&av_buffer[2]);
- malware_name = malware_name_buffer;
- }
- else if (!strncmp(CS av_buffer, "-1", 2)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: malware acl condition: sophie reported error");
- return DEFER;
- }
- else {
- /* all ok, no virus */
- malware_name = NULL;
- }
- }
- /* ----------------------------------------------------------------------- */
-
-
- /* "clamd" scanner type ------------------------------------------------- */
- /* This code was originally contributed by David Saez */
- /* There are three scanning methods available to us:
- * (1) Use the SCAN command, pointing to a file in the filesystem
- * (2) Use the STREAM command, send the data on a separate port
- * (3) Use the zINSTREAM command, send the data inline
- * The zINSTREAM command was introduced with ClamAV 0.95, which marked
- * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
- * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
- * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
- * WITH_OLD_CLAMAV_STREAM is defined.
- * See Exim bug 926 for details. */
- else if (strcmpic(scanner_name,US"clamd") == 0) {
- uschar *clamd_options = NULL;
- uschar clamd_options_buffer[1024];
- uschar clamd_options_default[] = "/tmp/clamd";
- uschar *p, *vname, *result_tag, *response_end;
- struct sockaddr_un server;
- int sock,bread=0;
- unsigned int port;
- uschar file_name[1024];
- uschar av_buffer[1024];
- uschar *hostname = "";
- struct hostent *he;
- struct in_addr in;
- uschar *clamav_fbuf;
- int clam_fd, result;
- unsigned int fsize;
- BOOL use_scan_command = FALSE, fits;
- clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
- int current_server;
- int num_servers = 0;
-#ifdef WITH_OLD_CLAMAV_STREAM
- uschar av_buffer2[1024];
- int sockData;
-#else
- uint32_t send_size, send_final_zeroblock;
-#endif
+ malware_name = NULL;
- if ((clamd_options = string_nextinlist(&av_scanner_work, &sep,
- clamd_options_buffer,
- sizeof(clamd_options_buffer))) == NULL) {
- /* no options supplied, use default options */
- clamd_options = clamd_options_default;
- }
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
+ scanner_name, scanner_options);
+
+ /* pass options */
+ memset(av_buffer, 0, sizeof(av_buffer));
+ for (i=0; i != nelements(cmdopt); i++) {
+
+ if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
+ if (bread >0) av_buffer[bread]='\0';
+ if (bread < 0)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to read answer %d (%s)", i, strerror(errno)),
+ sock);
+ for (j=0;j<bread;j++)
+ if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
+ av_buffer[j] ='@';
+ }
- if (*clamd_options == '/')
- /* Local file; so we def want to use_scan_command and don't want to try
- * passing IP/port combinations */
- use_scan_command = TRUE;
- else {
- uschar *address = clamd_options;
- uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
-
- /* Go through the rest of the list of host/port and construct an array
- * of servers to try. The first one is the bit we just passed from
- * clamd_options so process that first and then scan the remainder of
- * the address buffer */
- do {
- clamd_address_container *this_clamd;
-
- /* The 'local' option means use the SCAN command over the network
- * socket (ie common file storage in use) */
- if (strcmpic(address,US"local") == 0) {
- use_scan_command = TRUE;
- continue;
- }
+ /* pass the mailfile to fsecure */
+ file_name = string_sprintf("SCAN\t%s\n", eml_filename);
+
+ if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ /* set up match */
+ /* todo also SUSPICION\t */
+ fs_inf = m_pcre_compile(US"\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
+
+ /* read report, linewise */
+ do {
+ i = 0;
+ memset(av_buffer, 0, sizeof(av_buffer));
+ do {
+ if ((bread= ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT)) < 0)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to read result (%s)", strerror(errno)),
+ sock);
+ } while (++i < sizeof(av_buffer)-1 && av_buffer[i-1] != '\n');
+ av_buffer[i-1] = '\0';
+
+ /* Really search for virus again? */
+ if (malware_name == NULL)
+ /* try matcher on the line, grab substring */
+ malware_name = m_pcre_exec(fs_inf, av_buffer);
+ }
+ while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
+ break;
+ } /* fsecure */
- /* XXX: If unsuccessful we should free this memory */
- this_clamd =
- (clamd_address_container *)store_get(sizeof(clamd_address_container));
+ case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
+ {
+ time_t t;
+ uschar tmpbuf[1024];
+ uschar * scanrequest;
+ int kav_rc;
+ unsigned long kav_reportlen, bread;
+ const pcre *kav_re;
+ uschar *p;
+
+ /* get current date and time, build scan request */
+ time(&t);
+ /* pdp note: before the eml_filename parameter, this scanned the
+ directory; not finding documentation, so we'll strip off the directory.
+ The side-effect is that the test framework scanning may end up in
+ scanning more than was requested, but for the normal interface, this is
+ fine. */
+
+ strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
+ scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
+ p = Ustrrchr(scanrequest, '/');
+ if (p)
+ *p = '\0';
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
+ scanner_name, scanner_options);
+
+ /* send scan request */
+ if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ /* wait for result */
+ if ((bread = recv(sock, tmpbuf, 2, 0) != 2))
+ return m_errlog_defer_3(scanent,
+ US"unable to read 2 bytes from socket.", sock);
+
+ /* get errorcode from one nibble */
+ kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
+ switch(kav_rc)
+ {
+ case 5: case 6: /* improper kavdaemon configuration */
+ return m_errlog_defer_3(scanent,
+ US"please reconfigure kavdaemon to NOT disinfect or remove infected files.",
+ sock);
+ case 1:
+ return m_errlog_defer_3(scanent,
+ US"reported 'scanning not completed' (code 1).", sock);
+ case 7:
+ return m_errlog_defer_3(scanent,
+ US"reported 'kavdaemon damaged' (code 7).", sock);
+ }
- /* extract host and port part */
- if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u", this_clamd->tcp_addr,
- &(this_clamd->tcp_port)) != 2 ) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: invalid address '%s'", address);
- continue;
- }
+ /* code 8 is not handled, since it is ambigous. It appears mostly on
+ bounces where part of a file has been cut off */
+
+ /* "virus found" return codes (2-4) */
+ if ((kav_rc > 1) && (kav_rc < 5)) {
+ int report_flag = 0;
+
+ /* setup default virus name */
+ malware_name = US"unknown";
+
+ report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
+
+ /* read the report, if available */
+ if( report_flag == 1 ) {
+ /* read report size */
+ if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4)
+ return m_errlog_defer_3(scanent,
+ US"cannot read report size", sock);
+
+ /* it's possible that avp returns av_buffer[1] == 1 but the
+ reportsize is 0 (!?) */
+ if (kav_reportlen > 0) {
+ /* set up match regex, depends on retcode */
+ kav_re = m_pcre_compile( kav_rc == 3
+ ? US"suspicion:\\s*(.+?)\\s*$"
+ : US"infected:\\s*(.+?)\\s*$",
+ &errstr );
+
+ /* read report, linewise */
+ while (kav_reportlen > 0) {
+ bread = 0;
+ while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
+ kav_reportlen--;
+ if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
+ bread++;
+ }
+ bread++;
+ tmpbuf[bread] = '\0';
+
+ /* try matcher on the line, grab substring */
+ if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
+ break;
+ }
+ }
+ }
+ }
+ else /* no virus found */
+ malware_name = NULL;
- clamd_address_vector[num_servers] = this_clamd;
- num_servers++;
- if (num_servers >= MAX_CLAMD_SERVERS) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "More than " MAX_CLAMD_SERVERS_S " clamd servers specified; "
- "only using the first " MAX_CLAMD_SERVERS_S );
- break;
- }
- } while ((address = string_nextinlist(&av_scanner_work, &sep,
- address_buffer,
- sizeof(address_buffer))) != NULL);
-
- /* check if we have at least one server */
- if (!num_servers) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: no useable clamd server addresses in malware configuration option.");
- return DEFER;
- }
+ break;
}
- /* See the discussion of response formats below to see why we really don't
- like colons in filenames when passing filenames to ClamAV. */
- if (use_scan_command && Ustrchr(eml_filename, ':')) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: local/SCAN mode incompatible with" \
- " : in path to email filename [%s]", eml_filename);
- return DEFER;
- }
+ case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
+ {
+ const uschar *cmdline_scanner = scanner_options;
+ const pcre *cmdline_trigger_re;
+ const pcre *cmdline_regex_re;
+ uschar * file_name;
+ uschar * commandline;
+ void (*eximsigchld)(int);
+ void (*eximsigpipe)(int);
+ FILE *scanner_out = NULL;
+ FILE *scanner_record = NULL;
+ uschar linebuffer[32767];
+ int trigger = 0;
+ uschar *p;
+
+ if (!cmdline_scanner)
+ return m_errlog_defer(scanent, errstr);
+
+ /* find scanner output trigger */
+ cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
+ "missing trigger specification", &errstr);
+ if (!cmdline_trigger_re)
+ return m_errlog_defer(scanent, errstr);
+
+ /* find scanner name regex */
+ cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
+ "missing virus name regex specification", &errstr);
+ if (!cmdline_regex_re)
+ return m_errlog_defer(scanent, errstr);
+
+ /* prepare scanner call; despite the naming, file_name holds a directory
+ name which is documented as the value given to %s. */
+
+ file_name = string_copy(eml_filename);
+ p = Ustrrchr(file_name, '/');
+ if (p)
+ *p = '\0';
+ commandline = string_sprintf(CS cmdline_scanner, file_name);
+
+ /* redirect STDERR too */
+ commandline = string_sprintf("%s 2>&1", commandline);
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
+
+ /* store exims signal handlers */
+ eximsigchld = signal(SIGCHLD,SIG_DFL);
+ eximsigpipe = signal(SIGPIPE,SIG_DFL);
+
+ if (!(scanner_out = popen(CS commandline,"r"))) {
+ int err = errno;
+ signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
+ return m_errlog_defer(scanent,
+ string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
+ }
- /* We have some network servers specified */
- if (num_servers) {
-
- /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
- * only supports AF_INET, but we should probably be looking to the
- * future and rewriting this to be protocol-independent anyway. */
-
- while ( num_servers > 0 ) {
- /* Randomly pick a server to start with */
- current_server = random_number( num_servers );
-
- debug_printf("trying server name %s, port %u\n",
- clamd_address_vector[current_server]->tcp_addr,
- clamd_address_vector[current_server]->tcp_port);
-
- /* Lookup the host. This is to ensure that we connect to the same IP
- * on both connections (as one host could resolve to multiple ips) */
- if((he = gethostbyname(CS clamd_address_vector[current_server]->tcp_addr))
- == 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: failed to lookup host '%s'",
- clamd_address_vector[current_server]->tcp_addr
- );
- goto try_next_server;
- }
+ file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
+ spool_directory, message_id, message_id);
+ scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
+
+ if (scanner_record == NULL) {
+ int err = errno;
+ (void) pclose(scanner_out);
+ signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
+ return m_errlog_defer(scanent,
+ string_sprintf("opening scanner output file (%s) failed: %s.",
+ file_name, strerror(err)));
+ }
- in = *(struct in_addr *) he->h_addr_list[0];
+ /* look for trigger while recording output */
+ while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
+ if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
+ /* short write */
+ (void) pclose(scanner_out);
+ signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
+ return m_errlog_defer(scanent,
+ string_sprintf("short write on scanner output file (%s).", file_name));
+ }
+ /* try trigger match */
+ if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
+ trigger = 1;
+ }
- /* Open the ClamAV Socket */
- if ( (sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to acquire socket (%s)",
- strerror(errno));
- goto try_next_server;
- }
+ (void)fclose(scanner_record);
+ sep = pclose(scanner_out);
+ signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
+ if (sep != 0)
+ if (sep == -1)
+ return m_errlog_defer(scanent,
+ string_sprintf("running scanner failed: %s", strerror(sep)));
+ else
+ return m_errlog_defer(scanent,
+ string_sprintf("scanner returned error code: %d", sep));
+
+ if (trigger) {
+ uschar * s;
+ /* setup default virus name */
+ malware_name = US"unknown";
+
+ /* re-open the scanner output file, look for name match */
+ scanner_record = fopen(CS file_name, "rb");
+ while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
+ /* try match */
+ if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
+ malware_name = s;
+ }
+ (void)fclose(scanner_record);
+ }
+ else /* no virus found */
+ malware_name = NULL;
+ break;
+ } /* cmdline */
- if (ip_connect( sock,
- AF_INET,
- (uschar*)inet_ntoa(in),
- clamd_address_vector[current_server]->tcp_port,
- 5 ) > -1) {
- /* Connection successfully established with a server */
- hostname = clamd_address_vector[current_server]->tcp_addr;
- break;
- } else {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: connection to %s, port %u failed (%s)",
- clamd_address_vector[current_server]->tcp_addr,
- clamd_address_vector[current_server]->tcp_port,
- strerror(errno));
-
- (void)close(sock);
- }
+ case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
+ {
+ int bread = 0;
+ uschar *p;
+ uschar * file_name;
+ uschar av_buffer[1024];
+
+ /* pass the scan directory to sophie */
+ file_name = string_copy(eml_filename);
+ if ((p = Ustrrchr(file_name, '/')))
+ *p = '\0';
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
+ scanner_name, scanner_options);
+
+ if ( write(sock, file_name, Ustrlen(file_name)) < 0
+ || write(sock, "\n", 1) != 1
+ )
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to write to UNIX socket (%s)", scanner_options),
+ sock);
+
+ /* wait for result */
+ memset(av_buffer, 0, sizeof(av_buffer));
+ if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0))
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to read from UNIX socket (%s)", scanner_options),
+ sock);
+
+ /* infected ? */
+ if (av_buffer[0] == '1') {
+ uschar * s = Ustrchr(av_buffer, '\n');
+ if (s)
+ *s = '\0';
+ malware_name = string_copy(&av_buffer[2]);
+ }
+ else if (!strncmp(CS av_buffer, "-1", 2))
+ return m_errlog_defer_3(scanent, US"scanner reported error", sock);
+ else /* all ok, no virus */
+ malware_name = NULL;
-try_next_server:
- /* Remove the server from the list. XXX We should free the memory */
- num_servers--;
- int i;
- for( i = current_server; i < num_servers; i++ )
- clamd_address_vector[i] = clamd_address_vector[i+1];
- }
-
- if ( num_servers == 0 ) {
- log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: all clamd servers failed");
- return DEFER;
- }
- } else {
- /* open the local socket */
- if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to acquire socket (%s)",
- strerror(errno));
- return DEFER;
- }
-
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, clamd_options);
-
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to connect to UNIX socket %s (%s)",
- clamd_options, strerror(errno) );
- return DEFER;
- }
+ break;
}
- /* have socket in variable "sock"; command to use is semi-independent of
- * the socket protocol. We use SCAN if is local (either Unix/local
- * domain socket, or explicitly told local) else we stream the data.
- * How we stream the data depends upon how we were built. */
-
- if (!use_scan_command) {
-
-#ifdef WITH_OLD_CLAMAV_STREAM
- /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
- * that port on a second connection; then in the scan-method-neutral
- * part, read the response back on the original connection. */
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
- scanner_name);
-
- /* Pass the string to ClamAV (7 = "STREAM\n") */
- if (send(sock, "STREAM\n", 7, 0) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)",
- strerror(errno));
- (void)close(sock);
- return DEFER;
- }
- memset(av_buffer2, 0, sizeof(av_buffer2));
- bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
-
- if (bread < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to read PORT from socket (%s)",
- strerror(errno));
- (void)close(sock);
- return DEFER;
- }
-
- if (bread == sizeof(av_buffer)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: buffer too small");
- (void)close(sock);
- return DEFER;
- }
-
- if (!(*av_buffer2)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: ClamAV returned null");
- (void)close(sock);
- return DEFER;
- }
-
- av_buffer2[bread] = '\0';
- if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: Expected port information from clamd, got '%s'", av_buffer2);
- (void)close(sock);
- return DEFER;
- };
-
- if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to acquire socket (%s)",
- strerror(errno));
- (void)close(sock);
- return DEFER;
- }
-
- if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: connection to %s, port %u failed (%s)",
- inet_ntoa(in), port, strerror(errno));
- (void)close(sockData); (void)close(sock);
- return DEFER;
- }
-
-#define CLOSE_SOCKDATA (void)close(sockData)
-#else /* WITH_OLD_CLAMAV_STREAM not defined */
- /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
- chunks, <n> a 4-byte number (network order), terminated by a zero-length
- chunk. */
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
- scanner_name);
-
- /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
- if (send(sock, "zINSTREAM", 10, 0) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to send zINSTREAM to socket (%s)",
- strerror(errno));
- (void)close(sock);
- return DEFER;
- }
-
-#define CLOSE_SOCKDATA /**/
-#endif
-
- /* calc file size */
- clam_fd = open(CS eml_filename, O_RDONLY);
- if (clam_fd == -1) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: can't open spool file %s: %s",
- eml_filename, strerror(errno));
- CLOSE_SOCKDATA; (void)close(sock);
- return DEFER;
- }
- fsize = lseek(clam_fd, 0, SEEK_END);
- if (fsize == -1) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: can't seek spool file %s: %s",
- eml_filename, strerror(errno));
- CLOSE_SOCKDATA; (void)close(sock);
- return DEFER;
- }
- lseek(clam_fd, 0, SEEK_SET);
-
- clamav_fbuf = (uschar *) malloc (fsize);
- if (!clamav_fbuf) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to allocate memory %u for file (%s)",
- fsize, eml_filename);
- CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
- return DEFER;
- }
-
- result = read (clam_fd, clamav_fbuf, fsize);
- if (result == -1) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: can't read spool file %s: %s",
- eml_filename, strerror(errno));
- CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
- free(clamav_fbuf);
- return DEFER;
- }
- (void)close(clam_fd);
-
- /* send file body to socket */
-#ifdef WITH_OLD_CLAMAV_STREAM
- if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port);
- CLOSE_SOCKDATA; (void)close(sock);
- free(clamav_fbuf);
- return DEFER;
- }
-#else
- send_size = htonl(fsize);
- send_final_zeroblock = 0;
- if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
- (send(sock, clamav_fbuf, fsize, 0) < 0) ||
- (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
- {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to send file body to socket (%s:%u)", hostname, port);
- (void)close(sock);
- free(clamav_fbuf);
- return DEFER;
- }
-#endif
+ case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
+ {
+ /* This code was originally contributed by David Saez */
+ /* There are three scanning methods available to us:
+ * (1) Use the SCAN command, pointing to a file in the filesystem
+ * (2) Use the STREAM command, send the data on a separate port
+ * (3) Use the zINSTREAM command, send the data inline
+ * The zINSTREAM command was introduced with ClamAV 0.95, which marked
+ * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
+ * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
+ * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
+ * WITH_OLD_CLAMAV_STREAM is defined.
+ * See Exim bug 926 for details. */
+
+ uschar *p, *vname, *result_tag, *response_end;
+ int bread=0;
+ unsigned int port;
+ uschar * file_name;
+ uschar av_buffer[1024];
+ uschar *hostname = US"";
+ host_item connhost;
+ uschar *clamav_fbuf;
+ int clam_fd, result;
+ unsigned int fsize;
+ BOOL use_scan_command = FALSE;
+ clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
+ int current_server;
+ int num_servers = 0;
+ #ifdef WITH_OLD_CLAMAV_STREAM
+ uschar av_buffer2[1024];
+ int sockData;
+ #else
+ uint32_t send_size, send_final_zeroblock;
+ #endif
+
+ if (*scanner_options == '/')
+ /* Local file; so we def want to use_scan_command and don't want to try
+ * passing IP/port combinations */
+ use_scan_command = TRUE;
+ else {
+ const uschar *address = scanner_options;
+ uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
+
+ /* Go through the rest of the list of host/port and construct an array
+ * of servers to try. The first one is the bit we just passed from
+ * scanner_options so process that first and then scan the remainder of
+ * the address buffer */
+ do {
+ clamd_address_container *this_clamd;
+
+ /* The 'local' option means use the SCAN command over the network
+ * socket (ie common file storage in use) */
+ if (strcmpic(address,US"local") == 0) {
+ use_scan_command = TRUE;
+ continue;
+ }
+
+ /* XXX: If unsuccessful we should free this memory */
+ this_clamd =
+ (clamd_address_container *)store_get(sizeof(clamd_address_container));
+
+ /* extract host and port part */
+ if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
+ this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
+ (void) m_errlog_defer(scanent,
+ string_sprintf("invalid address '%s'", address));
+ continue;
+ }
+
+ clamd_address_vector[num_servers] = this_clamd;
+ num_servers++;
+ if (num_servers >= MAX_CLAMD_SERVERS) {
+ (void) m_errlog_defer(scanent,
+ US"More than " MAX_CLAMD_SERVERS_S " clamd servers "
+ "specified; only using the first " MAX_CLAMD_SERVERS_S );
+ break;
+ }
+ } while ((address = string_nextinlist(&av_scanner_work, &sep,
+ address_buffer,
+ sizeof(address_buffer))) != NULL);
+
+ /* check if we have at least one server */
+ if (!num_servers)
+ return m_errlog_defer(scanent,
+ US"no useable server addresses in malware configuration option.");
+ }
- free(clamav_fbuf);
-
- CLOSE_SOCKDATA;
-#undef CLOSE_SOCKDATA
-
- } else { /* use scan command */
- /* Send a SCAN command pointing to a filename; then in the then in the
- * scan-method-neutral part, read the response back */
-
-/* ================================================================= */
-
- /* Prior to the reworking post-Exim-4.72, this scanned a directory,
- which dates to when ClamAV needed us to break apart the email into the
- MIME parts (eg, with the now deprecated demime condition coming first).
- Some time back, ClamAV gained the ability to deconstruct the emails, so
- doing this would actually have resulted in the mail attachments being
- scanned twice, in the broken out files and from the original .eml.
- Since ClamAV now handles emails (and has for quite some time) we can
- just use the email file itself. */
- /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
- fits = string_format(file_name, sizeof(file_name), "SCAN %s\n",
- eml_filename);
- if (!fits) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware filename does not fit in buffer [malware_internal() clamd]");
- }
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
- scanner_name, clamd_options);
-
- if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,"malware acl condition: clamd: unable to write to socket (%s)",
- strerror(errno));
- return DEFER;
- }
-
- /* Do not shut down the socket for writing; a user report noted that
- * clamd 0.70 does not react well to this. */
- }
- /* Commands have been sent, no matter which scan method or connection
- * type we're using; now just read the result, independent of method. */
-
- /* Read the result */
- memset(av_buffer, 0, sizeof(av_buffer));
- bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
- (void)close(sock);
-
- if (!(bread > 0)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unable to read from socket (%s)",
- strerror(errno));
- return DEFER;
- }
+ /* See the discussion of response formats below to see why we really don't
+ like colons in filenames when passing filenames to ClamAV. */
+ if (use_scan_command && Ustrchr(eml_filename, ':'))
+ return m_errlog_defer(scanent,
+ string_sprintf("local/SCAN mode incompatible with" \
+ " : in path to email filename [%s]", eml_filename));
+
+ /* We have some network servers specified */
+ if (num_servers) {
+
+ /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
+ * only supports AF_INET, but we should probably be looking to the
+ * future and rewriting this to be protocol-independent anyway. */
+
+ while ( num_servers > 0 ) {
+ /* Randomly pick a server to start with */
+ current_server = random_number( num_servers );
+
+ debug_printf("trying server name %s, port %u\n",
+ clamd_address_vector[current_server]->tcp_addr,
+ clamd_address_vector[current_server]->tcp_port);
+
+ /* Lookup the host. This is to ensure that we connect to the same IP
+ * on both connections (as one host could resolve to multiple ips) */
+ sock= m_tcpsocket(clamd_address_vector[current_server]->tcp_addr,
+ clamd_address_vector[current_server]->tcp_port,
+ &connhost, &errstr);
+ if (sock >= 0) {
+ /* Connection successfully established with a server */
+ hostname = clamd_address_vector[current_server]->tcp_addr;
+ break;
+ }
+
+ (void) m_errlog_defer(scanent, errstr);
+
+ /* Remove the server from the list. XXX We should free the memory */
+ num_servers--;
+ int i;
+ for( i = current_server; i < num_servers; i++ )
+ clamd_address_vector[i] = clamd_address_vector[i+1];
+ }
+
+ if ( num_servers == 0 )
+ return m_errlog_defer(scanent, US"all servers failed");
+
+ } else {
+ if ((sock = m_unixsocket(scanner_options, &errstr)) < 0)
+ return m_errlog_defer(scanent, errstr);
+ }
- if (bread == sizeof(av_buffer)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: buffer too small");
- return DEFER;
+ /* have socket in variable "sock"; command to use is semi-independent of
+ * the socket protocol. We use SCAN if is local (either Unix/local
+ * domain socket, or explicitly told local) else we stream the data.
+ * How we stream the data depends upon how we were built. */
+
+ if (!use_scan_command) {
+
+ #ifdef WITH_OLD_CLAMAV_STREAM
+ /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
+ * that port on a second connection; then in the scan-method-neutral
+ * part, read the response back on the original connection. */
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
+ scanner_name);
+
+ /* Pass the string to ClamAV (7 = "STREAM\n") */
+ if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ memset(av_buffer2, 0, sizeof(av_buffer2));
+ bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
+
+ if (bread < 0)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to read PORT from socket (%s)",
+ strerror(errno)),
+ sock);
+
+ if (bread == sizeof(av_buffer2))
+ return m_errlog_defer_3(scanent, "buffer too small", sock);
+
+ if (!(*av_buffer2))
+ return m_errlog_defer_3(scanent, "ClamAV returned null", sock);
+
+ av_buffer2[bread] = '\0';
+ if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 )
+ return m_errlog_defer_3(scanent,
+ string_sprintf("Expected port information from clamd, got '%s'",
+ av_buffer2),
+ sock);
+
+ sockData = m_tcpsocket(connhost.address, port, NULL, &errstr);
+ if (sockData < 0)
+ return m_errlog_defer_3(scanent, errstr, sock);
+
+ #define CLOSE_SOCKDATA (void)close(sockData)
+ #else /* WITH_OLD_CLAMAV_STREAM not defined */
+ /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
+ chunks, <n> a 4-byte number (network order), terminated by a zero-length
+ chunk. */
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
+ scanner_name);
+
+ /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
+ if (send(sock, "zINSTREAM", 10, 0) < 0)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send zINSTREAM to socket (%s)",
+ strerror(errno)),
+ sock);
+
+ #define CLOSE_SOCKDATA /**/
+ #endif
+
+ /* calc file size */
+ if ((clam_fd = open(CS eml_filename, O_RDONLY)) < 0) {
+ int err = errno;
+ CLOSE_SOCKDATA;
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't open spool file %s: %s",
+ eml_filename, strerror(err)),
+ sock);
+ }
+ if ((fsize = lseek(clam_fd, 0, SEEK_END)) < 0) {
+ int err = errno;
+ CLOSE_SOCKDATA; (void)close(clam_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't seek spool file %s: %s",
+ eml_filename, strerror(err)),
+ sock);
+ }
+ lseek(clam_fd, 0, SEEK_SET);
+
+ if (!(clamav_fbuf = (uschar *) malloc (fsize))) {
+ CLOSE_SOCKDATA; (void)close(clam_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to allocate memory %u for file (%s)",
+ fsize, eml_filename),
+ sock);
+ }
+
+ if ((result = read(clam_fd, clamav_fbuf, fsize)) < 0) {
+ int err = errno;
+ free(clamav_fbuf); CLOSE_SOCKDATA; (void)close(clam_fd);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("can't read spool file %s: %s",
+ eml_filename, strerror(err)),
+ sock);
+ }
+ (void)close(clam_fd);
+
+ /* send file body to socket */
+ #ifdef WITH_OLD_CLAMAV_STREAM
+ if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
+ free(clamav_fbuf); CLOSE_SOCKDATA;
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send file body to socket (%s:%u)",
+ hostname, port),
+ sock);
+ }
+ #else
+ send_size = htonl(fsize);
+ send_final_zeroblock = 0;
+ if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
+ (send(sock, clamav_fbuf, fsize, 0) < 0) ||
+ (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
+ {
+ free(clamav_fbuf);
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to send file body to socket (%s:%u)",
+ hostname, port),
+ sock);
+ }
+ #endif
+
+ free(clamav_fbuf);
+
+ CLOSE_SOCKDATA;
+ #undef CLOSE_SOCKDATA
+
+ } else { /* use scan command */
+ /* Send a SCAN command pointing to a filename; then in the then in the
+ * scan-method-neutral part, read the response back */
+
+ /* ================================================================= */
+
+ /* Prior to the reworking post-Exim-4.72, this scanned a directory,
+ which dates to when ClamAV needed us to break apart the email into the
+ MIME parts (eg, with the now deprecated demime condition coming first).
+ Some time back, ClamAV gained the ability to deconstruct the emails, so
+ doing this would actually have resulted in the mail attachments being
+ scanned twice, in the broken out files and from the original .eml.
+ Since ClamAV now handles emails (and has for quite some time) we can
+ just use the email file itself. */
+ /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
+ file_name = string_sprintf("SCAN %s\n", eml_filename);
+
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
+ scanner_name, scanner_options);
+
+ if (send(sock, file_name, Ustrlen(file_name), 0) < 0)
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to write to socket (%s)", strerror(errno)),
+ sock);
+
+ /* Do not shut down the socket for writing; a user report noted that
+ * clamd 0.70 does not react well to this. */
+ }
+ /* Commands have been sent, no matter which scan method or connection
+ * type we're using; now just read the result, independent of method. */
+
+ /* Read the result */
+ memset(av_buffer, 0, sizeof(av_buffer));
+ bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
+ (void)close(sock);
+ sock = -1;
+
+ if (!(bread > 0))
+ return m_errlog_defer(scanent,
+ string_sprintf("unable to read from socket (%s)", strerror(errno)));
+
+ if (bread == sizeof(av_buffer))
+ return m_errlog_defer(scanent, US"buffer too small");
+ /* We're now assured of a NULL at the end of av_buffer */
+
+ /* Check the result. ClamAV returns one of two result formats.
+ In the basic mode, the response is of the form:
+ infected: -> "<filename>: <virusname> FOUND"
+ not-infected: -> "<filename>: OK"
+ error: -> "<filename>: <errcode> ERROR
+ If the ExtendedDetectionInfo option has been turned on, then we get:
+ "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
+ for the infected case. Compare:
+ /tmp/eicar.com: Eicar-Test-Signature FOUND
+ /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
+
+ In the streaming case, clamd uses the filename "stream" which you should
+ be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
+ client app will replace "stream" with the original filename before returning
+ results to stdout, but the trace shows the data).
+
+ We will assume that the pathname passed to clamd from Exim does not contain
+ a colon. We will have whined loudly above if the eml_filename does (and we're
+ passing a filename to clamd). */
+
+ if (!(*av_buffer))
+ return m_errlog_defer(scanent, US"ClamAV returned null");
+
+ /* strip newline at the end (won't be present for zINSTREAM)
+ (also any trailing whitespace, which shouldn't exist, but we depend upon
+ this below, so double-check) */
+ p = av_buffer + Ustrlen(av_buffer) - 1;
+ if (*p == '\n') *p = '\0';
+
+ DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
+
+ while (isspace(*--p) && (p > av_buffer))
+ *p = '\0';
+ if (*p) ++p;
+ response_end = p;
+
+ /* colon in returned output? */
+ if((p = Ustrchr(av_buffer,':')) == NULL)
+ return m_errlog_defer(scanent,
+ string_sprintf("ClamAV returned malformed result (missing colon): %s",
+ av_buffer));
+
+ /* strip filename */
+ while (*p && isspace(*++p)) /**/;
+ vname = p;
+
+ /* It would be bad to encounter a virus with "FOUND" in part of the name,
+ but we should at least be resistant to it. */
+ p = Ustrrchr(vname, ' ');
+ result_tag = p ? p+1 : vname;
+
+ if (Ustrcmp(result_tag, "FOUND") == 0) {
+ /* p should still be the whitespace before the result_tag */
+ while (isspace(*p)) --p;
+ *++p = '\0';
+ /* Strip off the extended information too, which will be in parens
+ after the virus name, with no intervening whitespace. */
+ if (*--p == ')') {
+ /* "(hash:size)", so previous '(' will do; if not found, we have
+ a curious virus name, but not an error. */
+ p = Ustrrchr(vname, '(');
+ if (p)
+ *p = '\0';
+ }
+ malware_name = string_copy(vname);
+ DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
+
+ } else if (Ustrcmp(result_tag, "ERROR") == 0)
+ return m_errlog_defer(scanent,
+ string_sprintf("ClamAV returned: %s", av_buffer));
+
+ else if (Ustrcmp(result_tag, "OK") == 0) {
+ /* Everything should be OK */
+ malware_name = NULL;
+ DEBUG(D_acl) debug_printf("Malware not found\n");
+
+ } else
+ return m_errlog_defer(scanent,
+ string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
+
+ break;
+ } /* clamd */
+
+ case M_SOCK: /* "sock" scanner type ------------------------------------- */
+ /* This code was derived by Martin Poole from the clamd code contributed
+ by David Saez and the cmdline code
+ */
+ {
+ int bread;
+ uschar * commandline;
+ uschar av_buffer[1024];
+ uschar * linebuffer;
+ uschar * sockline_scanner;
+ uschar sockline_scanner_default[] = "%s\n";
+ const pcre *sockline_trig_re;
+ const pcre *sockline_name_re;
+
+ /* find scanner command line */
+ if ((sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
+ NULL, 0)))
+ { /* check for no expansions apart from one %s */
+ char * s = index(CS sockline_scanner, '%');
+ if (s++)
+ if ((*s != 's' && *s != '%') || index(s+1, '%'))
+ return m_errlog_defer_3(scanent,
+ US"unsafe sock scanner call spec", sock);
+ }
+ else
+ sockline_scanner = sockline_scanner_default;
+
+ /* find scanner output trigger */
+ sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
+ "missing trigger specification", &errstr);
+ if (!sockline_trig_re)
+ return m_errlog_defer_3(scanent, errstr, sock);
+
+ /* find virus name regex */
+ sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
+ "missing virus name regex specification", &errstr);
+ if (!sockline_name_re)
+ return m_errlog_defer_3(scanent, errstr, sock);
+
+ /* prepare scanner call - security depends on expansions check above */
+ commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
+ commandline = string_sprintf( CS sockline_scanner, CS commandline);
+
+
+ /* Pass the command string to the socket */
+ if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
+ return m_errlog_defer(scanent, errstr);
+
+ /* Read the result */
+ memset(av_buffer, 0, sizeof(av_buffer));
+ bread = read(sock, av_buffer, sizeof(av_buffer));
+
+ if (!(bread > 0))
+ return m_errlog_defer_3(scanent,
+ string_sprintf("unable to read from socket (%s)", strerror(errno)),
+ sock);
+
+ if (bread == sizeof(av_buffer))
+ return m_errlog_defer_3(scanent, US"buffer too small", sock);
+ linebuffer = string_copy(av_buffer);
+
+ /* try trigger match */
+ if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
+ if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
+ malware_name = US "unknown";
+ }
+ else /* no virus found */
+ malware_name = NULL;
+ break;
}
- /* Check the result. ClamAV returns one of two result formats.
- In the basic mode, the response is of the form:
- infected: -> "<filename>: <virusname> FOUND"
- not-infected: -> "<filename>: OK"
- error: -> "<filename>: <errcode> ERROR
- If the ExtendedDetectionInfo option has been turned on, then we get:
- "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
- for the infected case. Compare:
-/tmp/eicar.com: Eicar-Test-Signature FOUND
-/tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
-
- In the streaming case, clamd uses the filename "stream" which you should
- be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
- client app will replace "stream" with the original filename before returning
- results to stdout, but the trace shows the data).
-
- We will assume that the pathname passed to clamd from Exim does not contain
- a colon. We will have whined loudly above if the eml_filename does (and we're
- passing a filename to clamd). */
-
- if (!(*av_buffer)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: ClamAV returned null");
- return DEFER;
- }
+ case M_MKSD: /* "mksd" scanner type ------------------------------------- */
+ {
+ char *mksd_options_end;
+ int mksd_maxproc = 1; /* default, if no option supplied */
+ int sock;
+ int retval;
+
+ if (scanner_options) {
+ mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
+ if ( *scanner_options == '\0'
+ || *mksd_options_end != '\0'
+ || mksd_maxproc < 1
+ || mksd_maxproc > 32
+ )
+ return m_errlog_defer(scanent,
+ string_sprintf("invalid option '%s'", scanner_options));
+ }
- /* strip newline at the end (won't be present for zINSTREAM)
- (also any trailing whitespace, which shouldn't exist, but we depend upon
- this below, so double-check) */
- p = av_buffer + Ustrlen(av_buffer) - 1;
- if (*p == '\n') *p = '\0';
-
- DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
-
- while (isspace(*--p) && (p > av_buffer))
- *p = '\0';
- if (*p) ++p;
- response_end = p;
-
- /* colon in returned output? */
- if((p = Ustrchr(av_buffer,':')) == NULL) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: ClamAV returned malformed result (missing colon): %s",
- av_buffer);
- return DEFER;
- }
+ if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
+ return m_errlog_defer(scanent, errstr);
- /* strip filename */
- while (*p && isspace(*++p)) /**/;
- vname = p;
-
- /* It would be bad to encounter a virus with "FOUND" in part of the name,
- but we should at least be resistant to it. */
- p = Ustrrchr(vname, ' ');
- if (p)
- result_tag = p + 1;
- else
- result_tag = vname;
-
- if (Ustrcmp(result_tag, "FOUND") == 0) {
- /* p should still be the whitespace before the result_tag */
- while (isspace(*p)) --p;
- *++p = '\0';
- /* Strip off the extended information too, which will be in parens
- after the virus name, with no intervening whitespace. */
- if (*--p == ')') {
- /* "(hash:size)", so previous '(' will do; if not found, we have
- a curious virus name, but not an error. */
- p = Ustrrchr(vname, '(');
- if (p)
- *p = '\0';
- }
- Ustrncpy(malware_name_buffer, vname, sizeof(malware_name_buffer)-1);
- malware_name = malware_name_buffer;
- DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
-
- } else if (Ustrcmp(result_tag, "ERROR") == 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: ClamAV returned: %s",
- av_buffer);
- return DEFER;
-
- } else if (Ustrcmp(result_tag, "OK") == 0) {
- /* Everything should be OK */
malware_name = NULL;
- DEBUG(D_acl) debug_printf("Malware not found\n");
- } else {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: clamd: unparseable response from ClamAV: {%s}",
- av_buffer);
- return DEFER;
- }
+ DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
- } /* clamd */
-
- /* ----------------------------------------------------------------------- */
-
-
- /* "mksd" scanner type --------------------------------------------------- */
- else if (strcmpic(scanner_name,US"mksd") == 0) {
- uschar *mksd_options;
- char *mksd_options_end;
- uschar mksd_options_buffer[32];
- int mksd_maxproc = 1; /* default, if no option supplied */
- struct sockaddr_un server;
- int sock;
- int retval;
-
- if ((mksd_options = string_nextinlist(&av_scanner_work, &sep,
- mksd_options_buffer,
- sizeof(mksd_options_buffer))) != NULL) {
- mksd_maxproc = (int) strtol(CS mksd_options, &mksd_options_end, 10);
- if ((*mksd_options == '\0') || (*mksd_options_end != '\0') ||
- (mksd_maxproc < 1) || (mksd_maxproc > 32)) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: mksd: invalid option '%s'", mksd_options);
- return DEFER;
- }
- }
-
- /* open the mksd socket */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0) {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: can't open UNIX socket.");
- return DEFER;
- }
- server.sun_family = AF_UNIX;
- Ustrcpy(server.sun_path, "/var/run/mksd/socket");
- if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
- (void)close(sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to connect to mksd UNIX socket (/var/run/mksd/socket). errno=%d", errno);
- return DEFER;
+ if ((retval = mksd_scan_packed(scanent, sock, eml_filename)) != OK) {
+ close (sock);
+ return retval;
+ }
+ break;
}
-
- malware_name = NULL;
-
- DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
-
- retval = mksd_scan_packed(sock, eml_filename);
-
- if (retval != OK)
- return retval;
}
- /* ----------------------------------------------------------------------- */
- /* "unknown" scanner type ------------------------------------------------- */
- else {
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware condition: unknown scanner type '%s'", scanner_name);
- return DEFER;
- };
- /* ----------------------------------------------------------------------- */
-
- /* set "been here, done that" marker */
- malware_ok = 1;
- };
+ if (sock >= 0)
+ (void) close (sock);
+ malware_ok = TRUE; /* set "been here, done that" marker */
+ }
/* match virus name against pattern (caseless ------->----------v) */
- if ( (malware_name != NULL) &&
- (regex_match_and_setup(re, malware_name, 0, -1)) ) {
+ if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
return OK;
}
- else {
+ else
return FAIL;
- };
}
/* simple wrapper for reading lines from sockets */
-int recv_line(int sock, uschar *buffer, int size) {
+int
+recv_line(int sock, uschar *buffer, int size)
+{
uschar *p = buffer;
memset(buffer,0,size);
@@ -1895,7 +1539,7 @@ int recv_line(int sock, uschar *buffer, int size) {
if ((p-buffer) > (size-2)) break;
if (*p == '\n') break;
if (*p != '\r') p++;
- };
+ }
*p = '\0';
return (p-buffer);
@@ -1906,7 +1550,8 @@ int recv_line(int sock, uschar *buffer, int size) {
#include <sys/uio.h>
-static int mksd_writev (int sock, struct iovec *iov, int iovcnt)
+static inline int
+mksd_writev (int sock, struct iovec *iov, int iovcnt)
{
int i;
@@ -1915,9 +1560,7 @@ static int mksd_writev (int sock, struct iovec *iov, int iovcnt)
i = writev (sock, iov, iovcnt);
while ((i < 0) && (errno == EINTR));
if (i <= 0) {
- close (sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to write to mksd UNIX socket (/var/run/mksd/socket)");
+ (void) malware_errlog_defer(US"unable to write to mksd UNIX socket (/var/run/mksd/socket)");
return -1;
}
@@ -1935,25 +1578,22 @@ static int mksd_writev (int sock, struct iovec *iov, int iovcnt)
}
}
-static int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
+static inline int
+mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
{
int offset = 0;
int i;
do {
if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
- close (sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: unable to read from mksd UNIX socket (/var/run/mksd/socket)");
+ (void) malware_errlog_defer(US"unable to read from mksd UNIX socket (/var/run/mksd/socket)");
return -1;
}
offset += i;
/* offset == av_buffer_size -> buffer full */
if (offset == av_buffer_size) {
- close (sock);
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: malformed reply received from mksd");
+ (void) malware_errlog_defer(US"malformed reply received from mksd");
return -1;
}
} while (av_buffer[offset-1] != '\n');
@@ -1962,41 +1602,39 @@ static int mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
return offset;
}
-static int mksd_parse_line (char *line)
+static inline int
+mksd_parse_line(struct scan * scanent, char *line)
{
char *p;
switch (*line) {
- case 'O':
- /* OK */
+ case 'O': /* OK */
return OK;
+
case 'E':
- case 'A':
- /* ERR */
+ case 'A': /* ERR */
if ((p = strchr (line, '\n')) != NULL)
- (*p) = '\0';
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: mksd scanner failed: %s", line);
- return DEFER;
- default:
- /* VIR */
+ *p = '\0';
+ return m_errlog_defer(scanent,
+ string_sprintf("scanner failed: %s", line));
+
+ default: /* VIR */
if ((p = strchr (line, '\n')) != NULL) {
- (*p) = '\0';
- if (((p-line) > 5) && ((p-line) < sizeof (malware_name_buffer)) && (line[3] == ' '))
+ *p = '\0';
+ if (((p-line) > 5) && (line[3] == ' '))
if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
- (*p) = '\0';
- Ustrcpy (malware_name_buffer, line+4);
- malware_name = malware_name_buffer;
+ *p = '\0';
+ malware_name = string_copy(US line+4);
return OK;
}
}
- log_write(0, LOG_MAIN|LOG_PANIC,
- "malware acl condition: malformed reply received from mksd: %s", line);
- return DEFER;
+ return m_errlog_defer(scanent,
+ string_sprintf("malformed reply received: %s", line));
}
}
-static int mksd_scan_packed(int sock, uschar *scan_filename)
+static int
+mksd_scan_packed(struct scan * scanent, int sock, uschar *scan_filename)
{
struct iovec iov[3];
const char *cmd = "MSQ\n";
@@ -2015,9 +1653,10 @@ static int mksd_scan_packed(int sock, uschar *scan_filename)
if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
return DEFER;
- close (sock);
-
- return mksd_parse_line (CS av_buffer);
+ return mksd_parse_line (scanent, CS av_buffer);
}
-#endif
+#endif /*WITH_CONTENT_SCAN*/
+/*
+ * vi: aw ai sw=2
+ */
diff --git a/src/src/string.c b/src/src/string.c
index 0e73e2c..94d61b1 100644
--- a/src/src/string.c
+++ b/src/src/string.c
@@ -34,7 +34,7 @@ Returns: 0 if the string is not a textual representation of an IP address
*/
int
-string_is_ip_address(uschar *s, int *maskptr)
+string_is_ip_address(const uschar *s, int *maskptr)
{
int i;
int yield = 4;
@@ -44,7 +44,7 @@ offset. */
if (maskptr != NULL)
{
- uschar *ss = s + Ustrlen(s);
+ const uschar *ss = s + Ustrlen(s);
*maskptr = 0;
if (s != ss && isdigit(*(--ss)))
{
