svn commit: r331079 - in stable/11/contrib/blacklist: bin libexec
Kurt Lidl
lidl at FreeBSD.org
Fri Mar 16 23:34:45 UTC 2018
Author: lidl
Date: Fri Mar 16 23:34:44 2018
New Revision: 331079
URL: https://svnweb.freebsd.org/changeset/base/331079
Log:
MFC r328861: improve blacklist-helper shell script
Modified:
stable/11/contrib/blacklist/bin/blacklistd.8
stable/11/contrib/blacklist/bin/blacklistd.c
stable/11/contrib/blacklist/libexec/blacklistd-helper
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/contrib/blacklist/bin/blacklistd.8
==============================================================================
--- stable/11/contrib/blacklist/bin/blacklistd.8 Fri Mar 16 22:25:33 2018 (r331078)
+++ stable/11/contrib/blacklist/bin/blacklistd.8 Fri Mar 16 23:34:44 2018 (r331079)
@@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd June 7, 2016
+.Dd Dec 6, 2017
.Dt BLACKLISTD 8
.Os
.Sh NAME
@@ -35,7 +35,7 @@
.Nd block and release ports on demand to avoid DoS abuse
.Sh SYNOPSIS
.Nm
-.Op Fl dfrv
+.Op Fl Bdfrv
.Op Fl C Ar controlprog
.Op Fl c Ar configfile
.Op Fl D Ar dbfile
@@ -154,6 +154,8 @@ The Berkeley DB file where
.Nm
stores its state, usually
.Pa /var/run/blacklistd.db .
+.It Fl B
+Disable processing of bad-usernames.
.It Fl d
Normally,
.Nm
Modified: stable/11/contrib/blacklist/bin/blacklistd.c
==============================================================================
--- stable/11/contrib/blacklist/bin/blacklistd.c Fri Mar 16 22:25:33 2018 (r331078)
+++ stable/11/contrib/blacklist/bin/blacklistd.c Fri Mar 16 23:34:44 2018 (r331079)
@@ -76,6 +76,7 @@ static DB *state;
static const char *dbfile = _PATH_BLSTATE;
static sig_atomic_t readconf;
static sig_atomic_t done;
+static int Bflag;
static int vflag;
static void
@@ -164,12 +165,85 @@ getremoteaddress(bl_info_t *bi, struct sockaddr_storag
return 0;
}
+static const char *badnames_email[] = {
+ "info",
+ "root",
+ "admin",
+ "support",
+ "webmaster",
+ "sales",
+ "postmaster",
+ "marketing",
+ "administrator",
+ "default",
+ "noreply",
+ "ftpuser",
+ "backup",
+ "webadmin",
+ "security",
+ NULL
+};
+
+static const char *badnames_ssh[] = {
+ "admin",
+ "support",
+ "pi",
+ "info",
+ "root",
+ "guest",
+ "webmaster",
+ "ubnt",
+ "abuse",
+ "default",
+ "apache",
+ "nginx",
+ "cisco",
+ "administrator",
+ "ftpuser",
+ "supervisor",
+ "mysql",
+ "postgres",
+ "oracle",
+ "security",
+ "nagios",
+ "webadmin",
+ "usuario",
+ "uucp",
+ "PlcmSpIp",
+ " 0101",
+ NULL
+};
+
+static int
+lookup_username(int proto, int port, const char *username)
+{
+ int i;
+ const char **names;
+
+ if (proto != IPPROTO_TCP)
+ return 0;
+
+ if (port == 22)
+ names = badnames_ssh;
+ else if (port == 25 || port == 587)
+ names = badnames_email;
+ else
+ return 0;
+
+ for (i = 0; names[i] != NULL; i++) {
+ if (strcmp(username, names[i]) == 0)
+ return 1;
+ }
+ return 0;
+}
+
static void
process(bl_t bl)
{
struct sockaddr_storage rss;
socklen_t rsl;
char rbuf[BUFSIZ];
+ int runadd, rundelete;
bl_info_t *bi;
struct conf c;
struct dbinfo dbi;
@@ -213,59 +287,74 @@ process(bl_t bl)
fmttime(b2, sizeof(b2), ts.tv_sec));
}
+ runadd = rundelete = 0;
+
switch (bi->bi_type) {
case BL_ABUSE:
/*
* If the application has signaled abusive behavior,
- * set the number of fails to be one less than the
- * configured limit. Fallthrough to the normal BL_ADD
- * processing, which will increment the failure count
- * to the threshhold, and block the abusive address.
+ * set the number of fails to be the configured limit.
*/
if (c.c_nfail != -1)
- dbi.count = c.c_nfail - 1;
- /*FALLTHROUGH*/
- case BL_ADD:
- dbi.count++;
- dbi.last = ts.tv_sec;
- if (dbi.id[0]) {
- /*
- * We should not be getting this since the rule
- * should have blocked the address. A possible
- * explanation is that someone removed that rule,
- * and another would be that we got another attempt
- * before we added the rule. In anycase, we remove
- * and re-add the rule because we don't want to add
- * it twice, because then we'd lose track of it.
- */
- (*lfun)(LOG_DEBUG, "rule exists %s", dbi.id);
- (void)run_change("rem", &c, dbi.id, 0);
- dbi.id[0] = '\0';
- }
- if (c.c_nfail != -1 && dbi.count >= c.c_nfail) {
- int res = run_change("add", &c, dbi.id, sizeof(dbi.id));
- if (res == -1)
- goto out;
- sockaddr_snprintf(rbuf, sizeof(rbuf), "%a",
- (void *)&rss);
- (*lfun)(LOG_INFO,
- "blocked %s/%d:%d for %d seconds",
- rbuf, c.c_lmask, c.c_port, c.c_duration);
-
- }
+ dbi.count = c.c_nfail;
+ rundelete = 1;
+ runadd = 1;
break;
case BL_DELETE:
if (dbi.last == 0)
goto out;
dbi.count = 0;
dbi.last = 0;
+ rundelete = 1;
break;
case BL_BADUSER:
- /* ignore for now */
+ (*lfun)(LOG_DEBUG, "BL_BADUSER: username %s", bi->bi_msg);
+ dbi.count--;
+ if (Bflag == 0 && lookup_username(c.c_proto, c.c_port, bi->bi_msg) == 1) {
+ dbi.count = c.c_nfail - 1;
+ (*lfun)(LOG_DEBUG, "BL_BADUSER: found %s on list (port: %d)", bi->bi_msg, c.c_port);
+ }
+ /* FALLTHROUGH */
+ case BL_ADD:
+ dbi.count++;
+ dbi.last = ts.tv_sec;
+ if (c.c_nfail != -1 && dbi.count >= c.c_nfail) {
+ rundelete = 1;
+ runadd = 1;
+ }
break;
default:
(*lfun)(LOG_ERR, "unknown message %d", bi->bi_type);
}
+
+ if (rundelete && c.c_duration != -1) {
+ /*
+ * We should not be getting this since the rule
+ * should have blocked the address. A possible
+ * explanation is that someone removed that rule,
+ * and another would be that we got another attempt
+ * before we added the rule. In anycase, we remove
+ * and re-add the rule because we don't want to add
+ * it twice, because then we'd lose track of it.
+ */
+ if (dbi.id[0]) {
+ (*lfun)(LOG_INFO, "rule exists %s", dbi.id);
+ (void)run_change("rem", &c, dbi.id, 0);
+ dbi.id[0] = '\0';
+ }
+ }
+ if (runadd) {
+ int res = run_change("add", &c, dbi.id, sizeof(dbi.id));
+ if (res == -1)
+ goto out;
+ sockaddr_snprintf(rbuf, sizeof(rbuf), "%a",
+ (void *)&rss);
+ (*lfun)(LOG_INFO,
+ "blocked %s/%d:%d for %d seconds",
+ rbuf, c.c_lmask, c.c_port, c.c_duration);
+ }
+
+ /* persist the data */
state_put(state, &c, &dbi);
out:
@@ -404,13 +493,16 @@ rules_restore(void)
struct conf c;
struct dbinfo dbi;
unsigned int f;
+ static int addremove;
for (f = 1; state_iterate(state, &c, &dbi, f) == 1; f = 0) {
if (dbi.id[0] == '\0')
continue;
(void)run_change("rem", &c, dbi.id, 0);
(void)run_change("add", &c, dbi.id, sizeof(dbi.id));
+ addremove++;
}
+ (*lfun)(LOG_INFO, "removed and re-added %d addresses", addremove);
}
int
@@ -429,8 +521,11 @@ main(int argc, char *argv[])
restore = 0;
tout = 0;
flags = O_RDWR|O_EXCL|O_CLOEXEC;
- while ((c = getopt(argc, argv, "C:c:D:dfP:rR:s:t:v")) != -1) {
+ while ((c = getopt(argc, argv, "BC:c:D:dfP:rR:s:t:v")) != -1) {
switch (c) {
+ case 'B':
+ Bflag++;
+ break;
case 'C':
controlprog = optarg;
break;
Modified: stable/11/contrib/blacklist/libexec/blacklistd-helper
==============================================================================
--- stable/11/contrib/blacklist/libexec/blacklistd-helper Fri Mar 16 22:25:33 2018 (r331078)
+++ stable/11/contrib/blacklist/libexec/blacklistd-helper Fri Mar 16 23:34:44 2018 (r331079)
@@ -80,8 +80,8 @@ add)
echo "block in quick $proto from <port$6> to any $port" | \
/sbin/pfctl -a "$2/$6" -f -
# insert $ip/$mask into per-protocol/port anchored table
- /sbin/pfctl -a "$2/$6" -t "port$6" -T add "$addr/$mask" && \
- echo OK
+ /sbin/pfctl -qa "$2/$6" -t "port$6" -T add "$addr/$mask" && \
+ /sbin/pfctl -q -k $addr && echo OK
;;
esac
;;
@@ -101,7 +101,7 @@ rem)
/sbin/npfctl rule "$2" rem-id "$7"
;;
pf)
- /sbin/pfctl -a "$2/$6" -t "port$6" -T delete "$addr/$mask" && \
+ /sbin/pfctl -qa "$2/$6" -t "port$6" -T delete "$addr/$mask" && \
echo OK
;;
esac
@@ -118,7 +118,13 @@ flush)
/sbin/npfctl rule "$2" flush
;;
pf)
- /sbin/pfctl -a "$2/$6" -t "port$6" -T flush && echo OK
+ # dynamically determine which anchors exist
+ anchors=$(/sbin/pfctl -a $2 -s Anchors)
+ for anchor in $anchors; do
+ /sbin/pfctl -a $anchor -t "port${anchor##*/}" -T flush
+ /sbin/pfctl -a $anchor -F rules
+ done
+ echo OK
;;
esac
;;
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