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upstream: Add a "refuseconnection" penalty class to sshd_config
PerSourcePenalties This allows penalising connection sources that have had connections dropped by the RefuseConnection option. ok markus@ OpenBSD-Commit-ID: 3c8443c427470bb3eac1880aa075cb4864463cb6
This commit is contained in:
djm@openbsd.org
Damien Miller
parent
8d21713b66
commit
7875975136
14
servconf.c
14
servconf.c
@ -1,4 +1,4 @@
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/* $OpenBSD: servconf.c,v 1.415 2024/09/15 01:09:40 djm Exp $ */
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/* $OpenBSD: servconf.c,v 1.416 2024/09/15 01:11:26 djm Exp $ */
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/*
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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@ -178,6 +178,7 @@ initialize_server_options(ServerOptions *options)
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options->per_source_penalty.penalty_authfail = -1;
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options->per_source_penalty.penalty_noauth = -1;
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options->per_source_penalty.penalty_grace = -1;
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options->per_source_penalty.penalty_refuseconnection = -1;
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options->per_source_penalty.penalty_max = -1;
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options->per_source_penalty.penalty_min = -1;
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options->max_authtries = -1;
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@ -440,6 +441,8 @@ fill_default_server_options(ServerOptions *options)
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options->per_source_penalty.penalty_authfail = 5;
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if (options->per_source_penalty.penalty_noauth == -1)
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options->per_source_penalty.penalty_noauth = 1;
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if (options->per_source_penalty.penalty_refuseconnection == -1)
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options->per_source_penalty.penalty_refuseconnection = 10;
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if (options->per_source_penalty.penalty_min == -1)
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options->per_source_penalty.penalty_min = 15;
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if (options->per_source_penalty.penalty_max == -1)
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@ -2054,6 +2057,9 @@ process_server_config_line_depth(ServerOptions *options, char *line,
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} else if (strncmp(arg, "grace-exceeded:", 15) == 0) {
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p = arg + 15;
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intptr = &options->per_source_penalty.penalty_grace;
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} else if (strncmp(arg, "refuseconnection:", 17) == 0) {
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p = arg + 17;
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intptr = &options->per_source_penalty.penalty_refuseconnection;
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} else if (strncmp(arg, "max:", 4) == 0) {
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p = arg + 4;
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intptr = &options->per_source_penalty.penalty_max;
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@ -3333,12 +3339,14 @@ dump_config(ServerOptions *o)
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if (o->per_source_penalty.enabled) {
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printf("persourcepenalties crash:%d authfail:%d noauth:%d "
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"grace-exceeded:%d max:%d min:%d max-sources4:%d "
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"max-sources6:%d overflow:%s overflow6:%s\n",
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"grace-exceeded:%d refuseconnection: %d max:%d min:%d "
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"max-sources4:%d max-sources6:%d "
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"overflow:%s overflow6:%s\n",
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o->per_source_penalty.penalty_crash,
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o->per_source_penalty.penalty_authfail,
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o->per_source_penalty.penalty_noauth,
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o->per_source_penalty.penalty_grace,
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o->per_source_penalty.penalty_refuseconnection,
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o->per_source_penalty.penalty_max,
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o->per_source_penalty.penalty_min,
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o->per_source_penalty.max_sources4,
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@ -1,4 +1,4 @@
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/* $OpenBSD: servconf.h,v 1.166 2024/09/15 01:09:40 djm Exp $ */
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/* $OpenBSD: servconf.h,v 1.167 2024/09/15 01:11:26 djm Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -77,6 +77,7 @@ struct per_source_penalty {
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int penalty_grace;
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int penalty_authfail;
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int penalty_noauth;
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int penalty_refuseconnection;
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int penalty_max;
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int penalty_min;
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};
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@ -381,6 +381,10 @@ srclimit_penalise(struct xaddr *addr, int penalty_type)
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penalty_secs = penalty_cfg.penalty_noauth;
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reason = "penalty: connections without attempting authentication";
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break;
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case SRCLIMIT_PENALTY_REFUSECONNECTION:
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penalty_secs = penalty_cfg.penalty_refuseconnection;
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reason = "penalty: connection prohibited by RefuseConnection";
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break;
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case SRCLIMIT_PENALTY_GRACE_EXCEEDED:
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penalty_secs = penalty_cfg.penalty_crash;
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reason = "penalty: exceeded LoginGraceTime";
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11
srclimit.h
11
srclimit.h
@ -22,11 +22,12 @@ void srclimit_init(int, int, int, int,
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int srclimit_check_allow(int, int);
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void srclimit_done(int);
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#define SRCLIMIT_PENALTY_NONE 0
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#define SRCLIMIT_PENALTY_CRASH 1
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#define SRCLIMIT_PENALTY_AUTHFAIL 2
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#define SRCLIMIT_PENALTY_GRACE_EXCEEDED 3
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#define SRCLIMIT_PENALTY_NOAUTH 4
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#define SRCLIMIT_PENALTY_NONE 0
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#define SRCLIMIT_PENALTY_CRASH 1
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#define SRCLIMIT_PENALTY_AUTHFAIL 2
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#define SRCLIMIT_PENALTY_GRACE_EXCEEDED 3
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#define SRCLIMIT_PENALTY_NOAUTH 4
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#define SRCLIMIT_PENALTY_REFUSECONNECTION 5
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/* meaningful exit values, used by sshd listener for penalties */
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#define EXIT_LOGIN_GRACE 3 /* login grace period exceeded */
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9
sshd.c
9
sshd.c
@ -1,4 +1,4 @@
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/* $OpenBSD: sshd.c,v 1.611 2024/09/12 00:36:27 djm Exp $ */
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/* $OpenBSD: sshd.c,v 1.612 2024/09/15 01:11:26 djm Exp $ */
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/*
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* Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved.
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* Copyright (c) 2002 Niels Provos. All rights reserved.
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@ -381,6 +381,13 @@ child_reap(struct early_child *child)
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(long)child->pid, child->id,
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child->early ? " (early)" : "");
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break;
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case EXIT_CONFIG_REFUSED:
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penalty_type = SRCLIMIT_PENALTY_REFUSECONNECTION;
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debug_f("preauth child %ld for %s prohibited by"
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"RefuseConnection %s",
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(long)child->pid, child->id,
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child->early ? " (early)" : "");
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break;
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default:
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penalty_type = SRCLIMIT_PENALTY_NOAUTH;
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debug_f("preauth child %ld for %s exited "
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@ -33,7 +33,7 @@
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $OpenBSD: sshd_config.5,v 1.371 2024/09/15 01:09:40 djm Exp $
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.\" $OpenBSD: sshd_config.5,v 1.372 2024/09/15 01:11:26 djm Exp $
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.Dd $Mdocdate: September 15 2024 $
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.Dt SSHD_CONFIG 5
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.Os
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@ -1605,6 +1605,11 @@ Specifies how long to refuse clients that cause a crash of
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.It Cm authfail:duration
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Specifies how long to refuse clients that disconnect after making one or more
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unsuccessful authentication attempts (default: 5s).
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.It Cm refuseconnection:duration
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Specified how long to refuse clients that were administratively prohibited
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connection via the
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.Cm RefuseConnection
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option (default: 10s).
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.It Cm noauth:duration
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Specifies how long to refuse clients that disconnect without attempting
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authentication (default: 1s).
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@ -1766,6 +1771,11 @@ The default is
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Indicates that
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.Xr sshd 8
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should unconditionally terminate the connection.
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Additionally, a
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.Cm refuseconnection
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penalty may be recorded against the source of the connection of
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.Cm PerSourcePenalties
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are enabled.
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This option is only really useful in a
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.Cm Match
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block.
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