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authorKurt Lidl <lidl@FreeBSD.org>2016-06-07 16:18:09 +0000
committerKurt Lidl <lidl@FreeBSD.org>2016-06-07 16:18:09 +0000
commitc0cc364181387bbd94be77451ebcf69bc23ed2a5 (patch)
tree37ea51eb146fb74c8e9cc3754d74234f3ae2d2ed /crypto
parent3707d4d3e30c3e712f1cb7a3accfc8cd9946a6cc (diff)
downloadsrc-c0cc364181387bbd94be77451ebcf69bc23ed2a5.tar.gz
src-c0cc364181387bbd94be77451ebcf69bc23ed2a5.zip
Add blacklist support to sshd
Reviewed by: rpaulo Approved by: rpaulo (earlier version of changes) Relnotes: YES Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D5915
Notes
Notes: svn path=/head/; revision=301551
Diffstat (limited to 'crypto')
-rw-r--r--crypto/openssh/auth-pam.c6
-rw-r--r--crypto/openssh/auth.c10
-rw-r--r--crypto/openssh/auth1.c9
-rw-r--r--crypto/openssh/auth2.c6
-rw-r--r--crypto/openssh/blacklist.c64
-rw-r--r--crypto/openssh/blacklist_client.h31
-rw-r--r--crypto/openssh/packet.c6
-rw-r--r--crypto/openssh/sshd.c13
8 files changed, 145 insertions, 0 deletions
diff --git a/crypto/openssh/auth-pam.c b/crypto/openssh/auth-pam.c
index 8425af1ea33a..53b9dbe47e5e 100644
--- a/crypto/openssh/auth-pam.c
+++ b/crypto/openssh/auth-pam.c
@@ -98,6 +98,9 @@
#include "ssh-gss.h"
#endif
#include "monitor_wrap.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
extern ServerOptions options;
extern Buffer loginmsg;
@@ -794,6 +797,9 @@ sshpam_query(void *ctx, char **name, char **info,
free(msg);
return (0);
}
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
error("PAM: %s for %s%.100s from %.100s", msg,
sshpam_authctxt->valid ? "" : "illegal user ",
sshpam_authctxt->user,
diff --git a/crypto/openssh/auth.c b/crypto/openssh/auth.c
index ba908801a169..c23b55d6a0cb 100644
--- a/crypto/openssh/auth.c
+++ b/crypto/openssh/auth.c
@@ -75,6 +75,9 @@ __RCSID("$FreeBSD$");
#include "authfile.h"
#include "ssherr.h"
#include "compat.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
/* import */
extern ServerOptions options;
@@ -306,6 +309,10 @@ auth_log(Authctxt *authctxt, int authenticated, int partial,
compat20 ? "ssh2" : "ssh1",
authctxt->info != NULL ? ": " : "",
authctxt->info != NULL ? authctxt->info : "");
+#ifdef USE_BLACKLIST
+ if (!authctxt->postponed)
+ blacklist_notify(!authenticated);
+#endif
free(authctxt->info);
authctxt->info = NULL;
@@ -640,6 +647,9 @@ getpwnamallow(const char *user)
}
#endif
if (pw == NULL) {
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
logit("Invalid user %.100s from %.100s",
user, get_remote_ipaddr());
#ifdef CUSTOM_FAILED_LOGIN
diff --git a/crypto/openssh/auth1.c b/crypto/openssh/auth1.c
index 5073c49bb37d..539e56c64196 100644
--- a/crypto/openssh/auth1.c
+++ b/crypto/openssh/auth1.c
@@ -43,6 +43,9 @@
#endif
#include "monitor_wrap.h"
#include "buffer.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
/* import */
extern ServerOptions options;
@@ -337,6 +340,9 @@ do_authloop(Authctxt *authctxt)
char *msg;
size_t len;
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
error("Access denied for user %s by PAM account "
"configuration", authctxt->user);
len = buffer_len(&loginmsg);
@@ -404,6 +410,9 @@ do_authentication(Authctxt *authctxt)
else {
debug("do_authentication: invalid user %s", user);
authctxt->pw = fakepw();
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
}
/* Configuration may have changed as a result of Match */
diff --git a/crypto/openssh/auth2.c b/crypto/openssh/auth2.c
index 1d9aab037dd6..eec196a9b584 100644
--- a/crypto/openssh/auth2.c
+++ b/crypto/openssh/auth2.c
@@ -52,6 +52,9 @@ __RCSID("$FreeBSD$");
#include "pathnames.h"
#include "buffer.h"
#include "canohost.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
#ifdef GSSAPI
#include "ssh-gss.h"
@@ -248,6 +251,9 @@ input_userauth_request(int type, u_int32_t seq, void *ctxt)
} else {
logit("input_userauth_request: invalid user %s", user);
authctxt->pw = fakepw();
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
#ifdef SSH_AUDIT_EVENTS
PRIVSEP(audit_event(SSH_INVALID_USER));
#endif
diff --git a/crypto/openssh/blacklist.c b/crypto/openssh/blacklist.c
new file mode 100644
index 000000000000..d172945c001f
--- /dev/null
+++ b/crypto/openssh/blacklist.c
@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 2015 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "ssh.h"
+#include "packet.h"
+#include "log.h"
+#include "blacklist_client.h"
+#include <blacklist.h>
+
+static struct blacklist *blstate;
+
+void
+blacklist_init(void)
+{
+ blstate = blacklist_open();
+}
+
+void
+blacklist_notify(int action)
+{
+ int fd;
+ if (blstate == NULL)
+ blacklist_init();
+ if (blstate == NULL)
+ return;
+ fd = packet_get_connection_in();
+ if (!packet_connection_is_on_socket()) {
+ fprintf(stderr, "packet_connection_is_on_socket: false "
+ "(fd = %d)\n", fd);
+ }
+ (void)blacklist_r(blstate, action, fd, "ssh");
+}
diff --git a/crypto/openssh/blacklist_client.h b/crypto/openssh/blacklist_client.h
new file mode 100644
index 000000000000..e63554dd5a71
--- /dev/null
+++ b/crypto/openssh/blacklist_client.h
@@ -0,0 +1,31 @@
+/*-
+ * Copyright (c) 2015 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+void blacklist_notify(int);
+void blacklist_init(void);
diff --git a/crypto/openssh/packet.c b/crypto/openssh/packet.c
index f3b3ce9cf250..9e1165a9b2bb 100644
--- a/crypto/openssh/packet.c
+++ b/crypto/openssh/packet.c
@@ -86,6 +86,9 @@ __RCSID("$FreeBSD$");
#include "packet.h"
#include "ssherr.h"
#include "sshbuf.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
#ifdef PACKET_DEBUG
#define DBG(x) x
@@ -2071,6 +2074,9 @@ sshpkt_fatal(struct ssh *ssh, const char *tag, int r)
case SSH_ERR_NO_KEX_ALG_MATCH:
case SSH_ERR_NO_HOSTKEY_ALG_MATCH:
if (ssh && ssh->kex && ssh->kex->failed_choice) {
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
fatal("Unable to negotiate with %.200s port %d: %s. "
"Their offer: %s", ssh_remote_ipaddr(ssh),
ssh_remote_port(ssh), ssh_err(r),
diff --git a/crypto/openssh/sshd.c b/crypto/openssh/sshd.c
index dd7fcdda3e94..d11592917e1e 100644
--- a/crypto/openssh/sshd.c
+++ b/crypto/openssh/sshd.c
@@ -135,6 +135,9 @@ __RCSID("$FreeBSD$");
#include "ssh-sandbox.h"
#include "version.h"
#include "ssherr.h"
+#ifdef USE_BLACKLIST
+#include "blacklist_client.h"
+#endif
#ifdef LIBWRAP
#include <tcpd.h>
@@ -388,6 +391,9 @@ grace_alarm_handler(int sig)
kill(0, SIGTERM);
}
+#ifdef USE_BLACKLIST
+ blacklist_notify(1);
+#endif
/* Log error and exit. */
sigdie("Timeout before authentication for %s", get_remote_ipaddr());
}
@@ -649,6 +655,10 @@ privsep_preauth_child(void)
/* Demote the private keys to public keys. */
demote_sensitive_data();
+#ifdef USE_BLACKLIST
+ blacklist_init();
+#endif
+
/* Demote the child */
if (getuid() == 0 || geteuid() == 0) {
/* Change our root directory */
@@ -1272,6 +1282,9 @@ server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s)
for (i = 0; i < options.max_startups; i++)
startup_pipes[i] = -1;
+#ifdef USE_BLACKLIST
+ blacklist_init();
+#endif
/*
* Stay listening for connections until the system crashes or
* the daemon is killed with a signal.