dropbear: cherry-pick upstream patches

critical fixes:
- libtommath: possible integer overflow (CVE-2023-36328)
- implement Strict KEX mode (CVE-2023-48795)

various fixes:
- fix DROPBEAR_DSS and DROPBEAR_RSA config options
- y2038 issues
- remove SO_LINGER socket option
- make banner reading failure non-fatal
- fix "noremotetcp" behavior
- don't try to shutdown a pty
- fix test for multiuser kernels

adds new features:
- option to bind to interface
- allow inetd with non-syslog
- ignore unsupported command line options with dropbearkey

Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>

23 files changed, 1520 insertions, 2 deletions

diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index 5339bbd108..d0b0e01646 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -114,7 +114,6 @@ DB_OPT_COMMON = \
 	DEFAULT_PATH|"$(TARGET_INIT_PATH)" \
 	!!LOCAL_IDENT|"SSH-2.0-dropbear" \
 	DROPBEAR_CLI_NETCAT|0 \
-	!!DROPBEAR_DSS|0 \
 	DROPBEAR_DSS|0 \
 	DO_MOTD|0 \
 
diff --git a/package/network/services/dropbear/patches/001-add-if-DROPBEAR_RSA-guards.patch b/package/network/services/dropbear/patches/001-add-if-DROPBEAR_RSA-guards.patch
new file mode 100644
index 0000000000..ad1a20c520
--- /dev/null
+++ b/package/network/services/dropbear/patches/001-add-if-DROPBEAR_RSA-guards.patch
@@ -0,0 +1,104 @@
+From 36a03132634a17c667c0fac0a8e1519b3d1b71c6 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Mon, 28 Nov 2022 21:12:23 +0800
+Subject: Add #if DROPBEAR_RSA guards
+
+Fixes building with DROPBEAR_RSA disabled.
+Closes #197
+---
+ signkey.c    | 8 +++++++-
+ signkey.h    | 2 ++
+ sysoptions.h | 5 +----
+ 3 files changed, 10 insertions(+), 5 deletions(-)
+
+--- a/signkey.c
++++ b/signkey.c
+@@ -120,6 +120,7 @@ enum signkey_type signkey_type_from_name
+ /* Special case for rsa-sha2-256. This could be generalised if more 
+    signature names are added that aren't 1-1 with public key names */
+ const char* signature_name_from_type(enum signature_type type, unsigned int *namelen) {
++#if DROPBEAR_RSA
+ #if DROPBEAR_RSA_SHA256
+ 	if (type == DROPBEAR_SIGNATURE_RSA_SHA256) {
+ 		if (namelen) {
+@@ -136,11 +137,13 @@ const char* signature_name_from_type(enu
+ 		return SSH_SIGNKEY_RSA;
+ 	}
+ #endif
++#endif /* DROPBEAR_RSA */
+ 	return signkey_name_from_type((enum signkey_type)type, namelen);
+ }
+ 
+ /* Returns DROPBEAR_SIGNATURE_NONE if none match */
+ enum signature_type signature_type_from_name(const char* name, unsigned int namelen) {
++#if DROPBEAR_RSA
+ #if DROPBEAR_RSA_SHA256
+ 	if (namelen == strlen(SSH_SIGNATURE_RSA_SHA256) 
+ 		&& memcmp(name, SSH_SIGNATURE_RSA_SHA256, namelen) == 0) {
+@@ -153,10 +156,11 @@ enum signature_type signature_type_from_
+ 		return DROPBEAR_SIGNATURE_RSA_SHA1;
+ 	}
+ #endif
++#endif /* DROPBEAR_RSA */
+ 	return (enum signature_type)signkey_type_from_name(name, namelen);
+ }
+ 
+-/* Returns the signature type from a key type. Must not be called 
++/* Returns the signature type from a key type. Must not be called
+    with RSA keytype */
+ enum signature_type signature_type_from_signkey(enum signkey_type keytype) {
+ #if DROPBEAR_RSA
+@@ -167,6 +171,7 @@ enum signature_type signature_type_from_
+ }
+ 
+ enum signkey_type signkey_type_from_signature(enum signature_type sigtype) {
++#if DROPBEAR_RSA
+ #if DROPBEAR_RSA_SHA256
+ 	if (sigtype == DROPBEAR_SIGNATURE_RSA_SHA256) {
+ 		return DROPBEAR_SIGNKEY_RSA;
+@@ -177,6 +182,7 @@ enum signkey_type signkey_type_from_sign
+ 		return DROPBEAR_SIGNKEY_RSA;
+ 	}
+ #endif
++#endif /* DROPBEAR_RSA */
+ 	assert((int)sigtype < (int)DROPBEAR_SIGNKEY_NUM_NAMED);
+ 	return (enum signkey_type)sigtype;
+ }
+--- a/signkey.h
++++ b/signkey.h
+@@ -79,12 +79,14 @@ enum signature_type {
+ 	DROPBEAR_SIGNATURE_SK_ED25519 = DROPBEAR_SIGNKEY_SK_ED25519,
+ #endif
+ #endif
++#if DROPBEAR_RSA
+ #if DROPBEAR_RSA_SHA1
+ 	DROPBEAR_SIGNATURE_RSA_SHA1 = 100, /* ssh-rsa signature (sha1) */
+ #endif
+ #if DROPBEAR_RSA_SHA256
+ 	DROPBEAR_SIGNATURE_RSA_SHA256 = 101, /* rsa-sha2-256 signature. has a ssh-rsa key */
+ #endif
++#endif /* DROPBEAR_RSA */
+ 	DROPBEAR_SIGNATURE_NONE = DROPBEAR_SIGNKEY_NONE,
+ };
+ 
+--- a/sysoptions.h
++++ b/sysoptions.h
+@@ -137,7 +137,7 @@
+ 
+ /* Debian doesn't define this in system headers */
+ #if !defined(LTM_DESC) && (DROPBEAR_ECC)
+-#define LTM_DESC 
++#define LTM_DESC
+ #endif
+ 
+ #define DROPBEAR_ECC_256 (DROPBEAR_ECC)
+@@ -151,9 +151,6 @@
+  * signing operations slightly slower. */
+ #define DROPBEAR_RSA_BLINDING 1
+ 
+-#ifndef DROPBEAR_RSA_SHA1
+-#define DROPBEAR_RSA_SHA1 DROPBEAR_RSA
+-#endif
+ #ifndef DROPBEAR_RSA_SHA256
+ #define DROPBEAR_RSA_SHA256 DROPBEAR_RSA
+ #endif
diff --git a/package/network/services/dropbear/patches/002-fix-y2038-issues.patch b/package/network/services/dropbear/patches/002-fix-y2038-issues.patch
new file mode 100644
index 0000000000..0654e3b98b
--- /dev/null
+++ b/package/network/services/dropbear/patches/002-fix-y2038-issues.patch
@@ -0,0 +1,198 @@
+From ec2215726cffb976019d08ebf569edd2229e9dba Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Thu, 1 Dec 2022 11:34:43 +0800
+Subject: Fix y2038 issues with time_t conversion
+
+These changes were identified by building with and without
+-D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64
+on 32-bit arm, logging warnings to files.
+-Wconversion was added to CFLAGS in both builds.
+
+Then a "diff -I Wconversion log1 log2" shows new warnings that appear
+with the 64-bit time_t. There are a few false positives that have been
+fixed for quietness.
+
+struct logininfo and struct wtmp are still problematic, those will
+need to be handled by libc.
+---
+ common-session.c | 43 +++++++++++++++++++++++++++----------------
+ dbutil.c         |  2 +-
+ loginrec.c       |  2 ++
+ loginrec.h       |  4 ++--
+ runopts.h        |  4 ++--
+ svr-auth.c       |  2 +-
+ 6 files changed, 35 insertions(+), 22 deletions(-)
+
+--- a/common-session.c
++++ b/common-session.c
+@@ -519,15 +519,24 @@ static void send_msg_keepalive() {
+ 	ses.last_packet_time_idle = old_time_idle;
+ }
+ 
++/* Returns the difference in seconds, clamped to LONG_MAX */
++static long elapsed(time_t now, time_t prev) {
++	time_t del = now - prev;
++	if (del > LONG_MAX) {
++		return LONG_MAX;
++	}
++	return (long)del;
++}
++
+ /* Check all timeouts which are required. Currently these are the time for
+  * user authentication, and the automatic rekeying. */
+ static void checktimeouts() {
+ 
+ 	time_t now;
+ 	now = monotonic_now();
+-	
++
+ 	if (IS_DROPBEAR_SERVER && ses.connect_time != 0
+-		&& now - ses.connect_time >= AUTH_TIMEOUT) {
++		&& elapsed(now, ses.connect_time) >= AUTH_TIMEOUT) {
+ 			dropbear_close("Timeout before auth");
+ 	}
+ 
+@@ -537,45 +546,47 @@ static void checktimeouts() {
+ 	}
+ 
+ 	if (!ses.kexstate.sentkexinit
+-			&& (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
++			&& (elapsed(now, ses.kexstate.lastkextime) >= KEX_REKEY_TIMEOUT
+ 			|| ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)) {
+ 		TRACE(("rekeying after timeout or max data reached"))
+ 		send_msg_kexinit();
+ 	}
+-	
++
+ 	if (opts.keepalive_secs > 0 && ses.authstate.authdone) {
+ 		/* Avoid sending keepalives prior to auth - those are
+ 		not valid pre-auth packet types */
+ 
+ 		/* Send keepalives if we've been idle */
+-		if (now - ses.last_packet_time_any_sent >= opts.keepalive_secs) {
++		if (elapsed(now, ses.last_packet_time_any_sent) >= opts.keepalive_secs) {
+ 			send_msg_keepalive();
+ 		}
+ 
+ 		/* Also send an explicit keepalive message to trigger a response
+ 		if the remote end hasn't sent us anything */
+-		if (now - ses.last_packet_time_keepalive_recv >= opts.keepalive_secs
+-			&& now - ses.last_packet_time_keepalive_sent >= opts.keepalive_secs) {
++		if (elapsed(now, ses.last_packet_time_keepalive_recv) >= opts.keepalive_secs
++			&& elapsed(now, ses.last_packet_time_keepalive_sent) >= opts.keepalive_secs) {
+ 			send_msg_keepalive();
+ 		}
+ 
+-		if (now - ses.last_packet_time_keepalive_recv 
++		if (elapsed(now, ses.last_packet_time_keepalive_recv)
+ 			>= opts.keepalive_secs * DEFAULT_KEEPALIVE_LIMIT) {
+ 			dropbear_exit("Keepalive timeout");
+ 		}
+ 	}
+ 
+-	if (opts.idle_timeout_secs > 0 
+-			&& now - ses.last_packet_time_idle >= opts.idle_timeout_secs) {
++	if (opts.idle_timeout_secs > 0
++			&& elapsed(now, ses.last_packet_time_idle) >= opts.idle_timeout_secs) {
+ 		dropbear_close("Idle timeout");
+ 	}
+ }
+ 
+-static void update_timeout(long limit, long now, long last_event, long * timeout) {
+-	TRACE2(("update_timeout limit %ld, now %ld, last %ld, timeout %ld",
+-		limit, now, last_event, *timeout))
++static void update_timeout(long limit, time_t now, time_t last_event, long * timeout) {
++	TRACE2(("update_timeout limit %ld, now %llu, last %llu, timeout %ld",
++		limit,
++		(unsigned long long)now,
++		(unsigned long long)last_event, *timeout))
+ 	if (last_event > 0 && limit > 0) {
+-		*timeout = MIN(*timeout, last_event+limit-now);
++		*timeout = MIN(*timeout, elapsed(now, last_event) + limit);
+ 		TRACE2(("new timeout %ld", *timeout))
+ 	}
+ }
+@@ -584,7 +595,7 @@ static long select_timeout() {
+ 	/* determine the minimum timeout that might be required, so
+ 	as to avoid waking when unneccessary */
+ 	long timeout = KEX_REKEY_TIMEOUT;
+-	long now = monotonic_now();
++	time_t now = monotonic_now();
+ 
+ 	if (!ses.kexstate.sentkexinit) {
+ 		update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout);
+@@ -596,7 +607,7 @@ static long select_timeout() {
+ 	}
+ 
+ 	if (ses.authstate.authdone) {
+-		update_timeout(opts.keepalive_secs, now, 
++		update_timeout(opts.keepalive_secs, now,
+ 			MAX(ses.last_packet_time_keepalive_recv, ses.last_packet_time_keepalive_sent),
+ 			&timeout);
+ 	}
+--- a/dbutil.c
++++ b/dbutil.c
+@@ -724,7 +724,7 @@ void gettime_wrapper(struct timespec *no
+ 	/* Fallback for everything else - this will sometimes go backwards */
+ 	gettimeofday(&tv, NULL);
+ 	now->tv_sec = tv.tv_sec;
+-	now->tv_nsec = 1000*tv.tv_usec;
++	now->tv_nsec = 1000*(long)tv.tv_usec;
+ }
+ 
+ /* second-resolution monotonic timestamp */
+--- a/loginrec.c
++++ b/loginrec.c
+@@ -459,6 +459,7 @@ line_abbrevname(char *dst, const char *s
+ void
+ set_utmp_time(struct logininfo *li, struct utmp *ut)
+ {
++	/* struct utmp in glibc isn't y2038 safe yet */
+ # ifdef HAVE_STRUCT_UTMP_UT_TV
+ 	ut->ut_tv.tv_sec = li->tv_sec;
+ 	ut->ut_tv.tv_usec = li->tv_usec;
+@@ -1272,6 +1273,7 @@ lastlog_construct(struct logininfo *li,
+ 	(void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
+ 	strlcpy(last->ll_host, li->hostname,
+ 		MIN_SIZEOF(last->ll_host, li->hostname));
++	/* struct lastlog in glibc isn't y2038 safe yet */
+ 	last->ll_time = li->tv_sec;
+ }
+ 
+--- a/loginrec.h
++++ b/loginrec.h
+@@ -139,8 +139,8 @@ struct logininfo {
+ 	/* struct timeval (sys/time.h) isn't always available, if it isn't we'll
+ 	 * use time_t's value as tv_sec and set tv_usec to 0
+ 	 */
+-	unsigned int tv_sec;
+-	unsigned int tv_usec;
++	time_t tv_sec;
++	suseconds_t tv_usec;
+ 	union login_netinfo hostaddr;       /* caller's host address(es) */
+ }; /* struct logininfo */
+ 
+--- a/runopts.h
++++ b/runopts.h
+@@ -39,8 +39,8 @@ typedef struct runopts {
+ 	int listen_fwd_all;
+ #endif
+ 	unsigned int recv_window;
+-	time_t keepalive_secs; /* Time between sending keepalives. 0 is off */
+-	time_t idle_timeout_secs; /* Exit if no traffic is sent/received in this time */
++	long keepalive_secs; /* Time between sending keepalives. 0 is off */
++	long idle_timeout_secs; /* Exit if no traffic is sent/received in this time */
+ 	int usingsyslog;
+ 
+ #ifndef DISABLE_ZLIB
+--- a/svr-auth.c
++++ b/svr-auth.c
+@@ -389,7 +389,7 @@ void send_msg_userauth_failure(int parti
+ 		Beware of integer overflow if increasing these values */
+ 		const unsigned int mindelay = 250000000;
+ 		const unsigned int vardelay = 100000000;
+-		unsigned int rand_delay;
++		suseconds_t rand_delay;
+ 		struct timespec delay;
+ 
+ 		gettime_wrapper(&delay);
diff --git a/package/network/services/dropbear/patches/003-fix-DROPBEAR_DSS.patch b/package/network/services/dropbear/patches/003-fix-DROPBEAR_DSS.patch
new file mode 100644
index 0000000000..6789800e12
--- /dev/null
+++ b/package/network/services/dropbear/patches/003-fix-DROPBEAR_DSS.patch
@@ -0,0 +1,25 @@
+From c043efb47c3173072fa636ca0da0d19875d4511f Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Tue, 6 Dec 2022 22:34:11 +0800
+Subject: Fix so DROPBEAR_DSS is only forced for fuzzing
+
+Regression from 787391ea3b5af2acf5e3c83372510f0c79477ad7,
+was missing fuzzing conditional
+---
+ sysoptions.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/sysoptions.h
++++ b/sysoptions.h
+@@ -380,9 +380,11 @@
+ #endif
+ 
+ /* Fuzzing expects all key types to be enabled */
++#if DROPBEAR_FUZZ
+ #if defined(DROPBEAR_DSS)
+ #undef DROPBEAR_DSS
+ #endif
+ #define DROPBEAR_DSS 1
++#endif
+ 
+ /* no include guard for this file */
diff --git a/package/network/services/dropbear/patches/004-allow-users-s-own-gid-in-pty-permission-check.patch b/package/network/services/dropbear/patches/004-allow-users-s-own-gid-in-pty-permission-check.patch
new file mode 100644
index 0000000000..bcb43aed2a
--- /dev/null
+++ b/package/network/services/dropbear/patches/004-allow-users-s-own-gid-in-pty-permission-check.patch
@@ -0,0 +1,24 @@
+From 860721558837441ab45019858e710a2625ffa46e Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Wed, 7 Dec 2022 13:04:10 +0800
+Subject: Allow users's own gid in pty permission check
+
+This allows non-root Dropbear to work even without devpts gid=5 mount
+option on Linux.
+---
+ sshpty.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/sshpty.c
++++ b/sshpty.c
+@@ -380,7 +380,9 @@ pty_setowner(struct passwd *pw, const ch
+ 				tty_name, strerror(errno));
+ 	}
+ 
+-	if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
++	/* Allow either "tty" gid or user's own gid. On Linux with openpty()
++	 * this varies depending on the devpts mount options */
++	if (st.st_uid != pw->pw_uid || !(st.st_gid == gid || st.st_gid == pw->pw_gid)) {
+ 		if (chown(tty_name, pw->pw_uid, gid) < 0) {
+ 			if (errno == EROFS &&
+ 			    (st.st_uid == pw->pw_uid || st.st_uid == 0)) {
diff --git a/package/network/services/dropbear/patches/005-const-parameter-mp_int.patch b/package/network/services/dropbear/patches/005-const-parameter-mp_int.patch
new file mode 100644
index 0000000000..0d23c9c416
--- /dev/null
+++ b/package/network/services/dropbear/patches/005-const-parameter-mp_int.patch
@@ -0,0 +1,123 @@
+From 01415ef8269e594a647f67ea0729ca8b590679de Mon Sep 17 00:00:00 2001
+From: Francois Perrad <francois.perrad@gadz.org>
+Date: Thu, 22 Dec 2022 10:19:54 +0100
+Subject: const parameter mp_int
+
+---
+ bignum.c   | 2 +-
+ bignum.h   | 2 +-
+ buffer.c   | 2 +-
+ buffer.h   | 2 +-
+ dbrandom.c | 2 +-
+ dbrandom.h | 2 +-
+ dbutil.c   | 2 +-
+ dbutil.h   | 2 +-
+ genrsa.c   | 4 ++--
+ 9 files changed, 10 insertions(+), 10 deletions(-)
+
+--- a/bignum.c
++++ b/bignum.c
+@@ -93,7 +93,7 @@ void bytes_to_mp(mp_int *mp, const unsig
+ 
+ /* hash the ssh representation of the mp_int mp */
+ void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, 
+-				hash_state *hs, mp_int *mp) {
++				hash_state *hs, const mp_int *mp) {
+ 	buffer * buf;
+ 
+ 	buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, 
+--- a/bignum.h
++++ b/bignum.h
+@@ -33,6 +33,6 @@ void m_mp_alloc_init_multi(mp_int **mp,
+ void m_mp_free_multi(mp_int **mp, ...)  ATTRIB_SENTINEL;
+ void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len);
+ void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, 
+-				hash_state *hs, mp_int *mp);
++				hash_state *hs, const mp_int *mp);
+ 
+ #endif /* DROPBEAR_BIGNUM_H_ */
+--- a/buffer.c
++++ b/buffer.c
+@@ -299,7 +299,7 @@ void buf_putbytes(buffer *buf, const uns
+ 
+ /* for our purposes we only need positive (or 0) numbers, so will
+  * fail if we get negative numbers */
+-void buf_putmpint(buffer* buf, mp_int * mp) {
++void buf_putmpint(buffer* buf, const mp_int * mp) {
+ 	size_t written;
+ 	unsigned int len, pad = 0;
+ 	TRACE2(("enter buf_putmpint"))
+--- a/buffer.h
++++ b/buffer.h
+@@ -65,7 +65,7 @@ void buf_putint(buffer* buf, unsigned in
+ void buf_putstring(buffer* buf, const char* str, unsigned int len);
+ void buf_putbufstring(buffer *buf, const buffer* buf_str);
+ void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len);
+-void buf_putmpint(buffer* buf, mp_int * mp);
++void buf_putmpint(buffer* buf, const mp_int * mp);
+ int buf_getmpint(buffer* buf, mp_int* mp);
+ unsigned int buf_getint(buffer* buf);
+ 
+--- a/dbrandom.c
++++ b/dbrandom.c
+@@ -347,7 +347,7 @@ void genrandom(unsigned char* buf, unsig
+  * rand must be an initialised *mp_int for the result.
+  * the result rand satisfies:  0 < rand < max 
+  * */
+-void gen_random_mpint(mp_int *max, mp_int *rand) {
++void gen_random_mpint(const mp_int *max, mp_int *rand) {
+ 
+ 	unsigned char *randbuf = NULL;
+ 	unsigned int len = 0;
+--- a/dbrandom.h
++++ b/dbrandom.h
+@@ -30,6 +30,6 @@
+ void seedrandom(void);
+ void genrandom(unsigned char* buf, unsigned int len);
+ void addrandom(const unsigned char * buf, unsigned int len);
+-void gen_random_mpint(mp_int *max, mp_int *rand);
++void gen_random_mpint(const mp_int *max, mp_int *rand);
+ 
+ #endif /* DROPBEAR_RANDOM_H_ */
+--- a/dbutil.c
++++ b/dbutil.c
+@@ -442,7 +442,7 @@ void printhex(const char * label, const
+ 	}
+ }
+ 
+-void printmpint(const char *label, mp_int *mp) {
++void printmpint(const char *label, const mp_int *mp) {
+ 	buffer *buf = buf_new(1000);
+ 	buf_putmpint(buf, mp);
+ 	fprintf(stderr, "%d bits ", mp_count_bits(mp));
+--- a/dbutil.h
++++ b/dbutil.h
+@@ -53,7 +53,7 @@ void dropbear_trace3(const char* format,
+ void dropbear_trace4(const char* format, ...) ATTRIB_PRINTF(1,2);
+ void dropbear_trace5(const char* format, ...) ATTRIB_PRINTF(1,2);
+ void printhex(const char * label, const unsigned char * buf, int len);
+-void printmpint(const char *label, mp_int *mp);
++void printmpint(const char *label, const mp_int *mp);
+ void debug_start_net(void);
+ extern int debug_trace;
+ #endif
+--- a/genrsa.c
++++ b/genrsa.c
+@@ -34,7 +34,7 @@
+ #if DROPBEAR_RSA
+ 
+ static void getrsaprime(mp_int* prime, mp_int *primeminus, 
+-		mp_int* rsa_e, unsigned int size_bytes);
++		const mp_int* rsa_e, unsigned int size_bytes);
+ 
+ /* mostly taken from libtomcrypt's rsa key generation routine */
+ dropbear_rsa_key * gen_rsa_priv_key(unsigned int size) {
+@@ -89,7 +89,7 @@ dropbear_rsa_key * gen_rsa_priv_key(unsi
+ 
+ /* return a prime suitable for p or q */
+ static void getrsaprime(mp_int* prime, mp_int *primeminus, 
+-		mp_int* rsa_e, unsigned int size_bytes) {
++		const mp_int* rsa_e, unsigned int size_bytes) {
+ 
+ 	unsigned char *buf;
+ 	int trials;
diff --git a/package/network/services/dropbear/patches/006-dropbearkey-add-missing-break-in-switch.patch b/package/network/services/dropbear/patches/006-dropbearkey-add-missing-break-in-switch.patch
new file mode 100644
index 0000000000..c7011021c1
--- /dev/null
+++ b/package/network/services/dropbear/patches/006-dropbearkey-add-missing-break-in-switch.patch
@@ -0,0 +1,21 @@
+From 39d955c49f31fc155e885447ee2be61c869d8c2d Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Tue, 3 Jan 2023 22:05:14 +0800
+Subject: Add missing break in switch
+
+Has no effect on execution, the fallthrough does nothing
+Closes #208
+---
+ dropbearkey.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/dropbearkey.c
++++ b/dropbearkey.c
+@@ -139,6 +139,7 @@ static void check_signkey_bits(enum sign
+ 				dropbear_exit("DSS keys have a fixed size of 1024 bits\n");
+ 				exit(EXIT_FAILURE);
+ 			}
++			break;
+ #endif
+ 		default:
+ 			(void)0; /* quiet, compiler. ecdsa handles checks itself */
diff --git a/package/network/services/dropbear/patches/007-fix-building-only-client-or-server.patch b/package/network/services/dropbear/patches/007-fix-building-only-client-or-server.patch
new file mode 100644
index 0000000000..5fcfaad180
--- /dev/null
+++ b/package/network/services/dropbear/patches/007-fix-building-only-client-or-server.patch
@@ -0,0 +1,29 @@
+From 7a53c7f0f4b3eb23e002819553cb45558642c01d Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Wed, 4 Jan 2023 20:32:23 +0800
+Subject: Fix building only client or server
+
+Regressed when -Wundef was added
+
+Fixes #210
+---
+ sysoptions.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+--- a/sysoptions.h
++++ b/sysoptions.h
+@@ -10,6 +10,14 @@
+ #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
+ #define PROGNAME "dropbear"
+ 
++#ifndef DROPBEAR_CLIENT
++#define DROPBEAR_CLIENT 0
++#endif
++
++#ifndef DROPBEAR_SERVER
++#define DROPBEAR_SERVER 0
++#endif
++
+ /* Spec recommends after one hour or 1 gigabyte of data. One hour
+  * is a bit too verbose, so we try 8 hours */
+ #ifndef KEX_REKEY_TIMEOUT
diff --git a/package/network/services/dropbear/patches/008-disable-rsa-signatures-when-no-rsa-hostkey.patch b/package/network/services/dropbear/patches/008-disable-rsa-signatures-when-no-rsa-hostkey.patch
new file mode 100644
index 0000000000..4f675234ff
--- /dev/null
+++ b/package/network/services/dropbear/patches/008-disable-rsa-signatures-when-no-rsa-hostkey.patch
@@ -0,0 +1,94 @@
+From a113381c12a2da3c9b7bd594f47a1b2657bdfdf2 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Sun, 12 Feb 2023 22:44:32 +0800
+Subject: Disable rsa signatures when no rsa hostkey
+
+Otherwise Dropbear will offer RSA as a hostkey signature option, but the
+session will exit with an assertion or NULL pointer dereference once
+that algorithm is negotiated.
+
+This likely regressed in 2020.79 when signature vs key type enums were
+split, for rsa-sha256.
+
+Fixes #219 on github
+---
+ svr-runopts.c | 21 +++++++++++----------
+ 1 file changed, 11 insertions(+), 10 deletions(-)
+
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -505,11 +505,11 @@ static void addportandaddress(const char
+ 	svr_opts.portcount++;
+ }
+ 
+-static void disablekey(int type) {
++static void disablekey(enum signature_type type) {
+ 	int i;
+ 	TRACE(("Disabling key type %d", type))
+ 	for (i = 0; sigalgs[i].name != NULL; i++) {
+-		if (sigalgs[i].val == type) {
++		if ((int)sigalgs[i].val == (int)type) {
+ 			sigalgs[i].usable = 0;
+ 			break;
+ 		}
+@@ -624,7 +624,8 @@ void load_all_hostkeys() {
+ 
+ #if DROPBEAR_RSA
+ 	if (!svr_opts.delay_hostkey && !svr_opts.hostkey->rsakey) {
+-		disablekey(DROPBEAR_SIGNKEY_RSA);
++		disablekey(DROPBEAR_SIGNATURE_RSA_SHA256);
++		disablekey(DROPBEAR_SIGNATURE_RSA_SHA1);
+ 	} else {
+ 		any_keys = 1;
+ 	}
+@@ -632,7 +633,7 @@ void load_all_hostkeys() {
+ 
+ #if DROPBEAR_DSS
+ 	if (!svr_opts.delay_hostkey && !svr_opts.hostkey->dsskey) {
+-		disablekey(DROPBEAR_SIGNKEY_DSS);
++		disablekey(DROPBEAR_SIGNATURE_DSS);
+ 	} else {
+ 		any_keys = 1;
+ 	}
+@@ -666,35 +667,35 @@ void load_all_hostkeys() {
+ #if DROPBEAR_ECC_256
+ 	if (!svr_opts.hostkey->ecckey256
+ 		&& (!svr_opts.delay_hostkey || loaded_any_ecdsa || ECDSA_DEFAULT_SIZE != 256 )) {
+-		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP256);
++		disablekey(DROPBEAR_SIGNATURE_ECDSA_NISTP256);
+ 	}
+ #endif
+ #if DROPBEAR_ECC_384
+ 	if (!svr_opts.hostkey->ecckey384
+ 		&& (!svr_opts.delay_hostkey || loaded_any_ecdsa || ECDSA_DEFAULT_SIZE != 384 )) {
+-		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP384);
++		disablekey(DROPBEAR_SIGNATURE_ECDSA_NISTP384);
+ 	}
+ #endif
+ #if DROPBEAR_ECC_521
+ 	if (!svr_opts.hostkey->ecckey521
+ 		&& (!svr_opts.delay_hostkey || loaded_any_ecdsa || ECDSA_DEFAULT_SIZE != 521 )) {
+-		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP521);
++		disablekey(DROPBEAR_SIGNATURE_ECDSA_NISTP521);
+ 	}
+ #endif
+ #endif /* DROPBEAR_ECDSA */
+ 
+ #if DROPBEAR_ED25519
+ 	if (!svr_opts.delay_hostkey && !svr_opts.hostkey->ed25519key) {
+-		disablekey(DROPBEAR_SIGNKEY_ED25519);
++		disablekey(DROPBEAR_SIGNATURE_ED25519);
+ 	} else {
+ 		any_keys = 1;
+ 	}
+ #endif
+ #if DROPBEAR_SK_ECDSA
+-	disablekey(DROPBEAR_SIGNKEY_SK_ECDSA_NISTP256);
++	disablekey(DROPBEAR_SIGNATURE_SK_ECDSA_NISTP256);
+ #endif 
+ #if DROPBEAR_SK_ED25519
+-	disablekey(DROPBEAR_SIGNKEY_SK_ED25519);
++	disablekey(DROPBEAR_SIGNATURE_SK_ED25519);
+ #endif
+ 
+ 	if (!any_keys) {
diff --git a/package/network/services/dropbear/patches/009-use-write-rather-than-fprintf-in-segv-handler.patch b/package/network/services/dropbear/patches/009-use-write-rather-than-fprintf-in-segv-handler.patch
new file mode 100644
index 0000000000..e1538a4c1f
--- /dev/null
+++ b/package/network/services/dropbear/patches/009-use-write-rather-than-fprintf-in-segv-handler.patch
@@ -0,0 +1,27 @@
+From 3292b8c6f1e5fcc405fa0f7a20e90a60f74037b2 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Sun, 12 Feb 2023 23:00:00 +0800
+Subject: Use write() rather than fprintf() in segv handler
+
+fprintf isn't guaranteed safe (though hasn't had any problems reported).
+---
+ svr-main.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+--- a/svr-main.c
++++ b/svr-main.c
+@@ -420,8 +420,12 @@ static void sigchld_handler(int UNUSED(u
+ 
+ /* catch any segvs */
+ static void sigsegv_handler(int UNUSED(unused)) {
+-	fprintf(stderr, "Aiee, segfault! You should probably report "
+-			"this as a bug to the developer\n");
++	int i;
++	const char *msg = "Aiee, segfault! You should probably report "
++			"this as a bug to the developer\n";
++	i = write(STDERR_FILENO, msg, strlen(msg));
++	/* ignore short writes */
++	(void)i;
+ 	_exit(EXIT_FAILURE);
+ }
+ 
diff --git a/package/network/services/dropbear/patches/010-remove-SO_LINGER.patch b/package/network/services/dropbear/patches/010-remove-SO_LINGER.patch
new file mode 100644
index 0000000000..12b1843ee2
--- /dev/null
+++ b/package/network/services/dropbear/patches/010-remove-SO_LINGER.patch
@@ -0,0 +1,39 @@
+From 5040f21cb4ee6ade966e60c6d5a3c270d03de1f1 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Mon, 1 May 2023 22:05:43 +0800
+Subject: Remove SO_LINGER
+
+It could cause channels to take up to 5 seconds to close(), which would block
+the entire process. On busy TCP forwarding sessions this would result in
+channels seeming stuck and new connections not being accepted.
+
+We don't need to monitor for flushing failures since we can't report errors, so
+SO_LINGER wasn't useful.
+
+Thanks to GektorUA for reporting and testing
+
+Fixes #230
+---
+ netio.c | 4 ----
+ 1 file changed, 4 deletions(-)
+
+--- a/netio.c
++++ b/netio.c
+@@ -472,7 +472,6 @@ int dropbear_listen(const char* address,
+ 	struct addrinfo hints, *res = NULL, *res0 = NULL;
+ 	int err;
+ 	unsigned int nsock;
+-	struct linger linger;
+ 	int val;
+ 	int sock;
+ 	uint16_t *allocated_lport_p = NULL;
+@@ -551,9 +550,6 @@ int dropbear_listen(const char* address,
+ 		val = 1;
+ 		/* set to reuse, quick timeout */
+ 		setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &val, sizeof(val));
+-		linger.l_onoff = 1;
+-		linger.l_linger = 5;
+-		setsockopt(sock, SOL_SOCKET, SO_LINGER, (void*)&linger, sizeof(linger));
+ 
+ #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
+ 		if (res->ai_family == AF_INET6) {
diff --git a/package/network/services/dropbear/patches/011-add-option-to-bind-to-interface.patch b/package/network/services/dropbear/patches/011-add-option-to-bind-to-interface.patch
new file mode 100644
index 0000000000..d1c1fa4cce
--- /dev/null
+++ b/package/network/services/dropbear/patches/011-add-option-to-bind-to-interface.patch
@@ -0,0 +1,147 @@
+From fb64db9eac3fdc6434f2dc7b5ea407fe5df76e6f Mon Sep 17 00:00:00 2001
+From: Diederik De Coninck <diederik.deconinck_ext@softathome.com>
+Date: Tue, 11 Apr 2023 15:38:04 +0200
+Subject: Add option to bind to interface
+
+---
+ netio.c       | 13 +++++++++++--
+ netio.h       |  2 +-
+ runopts.h     |  1 +
+ svr-main.c    |  2 +-
+ svr-runopts.c |  9 +++++++++
+ svr-tcpfwd.c  |  1 +
+ tcp-accept.c  |  2 +-
+ tcpfwd.h      |  1 +
+ 8 files changed, 26 insertions(+), 5 deletions(-)
+
+--- a/netio.c
++++ b/netio.c
+@@ -467,7 +467,7 @@ int get_sock_port(int sock) {
+  * failure, if errstring wasn't NULL, it'll be a newly malloced error
+  * string.*/
+ int dropbear_listen(const char* address, const char* port,
+-		int *socks, unsigned int sockcount, char **errstring, int *maxfd) {
++		int *socks, unsigned int sockcount, char **errstring, int *maxfd, const char* interface) {
+ 
+ 	struct addrinfo hints, *res = NULL, *res0 = NULL;
+ 	int err;
+@@ -497,7 +497,11 @@ int dropbear_listen(const char* address,
+ 		TRACE(("dropbear_listen: local loopback"))
+ 	} else {
+ 		if (address[0] == '\0') {
+-			TRACE(("dropbear_listen: all interfaces"))
++			if (interface) {
++				TRACE(("dropbear_listen: %s", interface))
++			} else {
++				TRACE(("dropbear_listen: all interfaces"))
++			}
+ 			address = NULL;
+ 		}
+ 		hints.ai_flags = AI_PASSIVE;
+@@ -551,6 +555,11 @@ int dropbear_listen(const char* address,
+ 		/* set to reuse, quick timeout */
+ 		setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &val, sizeof(val));
+ 
++		if(interface && setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)) < 0) {
++			dropbear_log(LOG_WARNING, "Couldn't set SO_BINDTODEVICE");
++			TRACE(("Failed setsockopt with errno failure, %d %s", errno, strerror(errno)))
++		}
++
+ #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
+ 		if (res->ai_family == AF_INET6) {
+ 			int on = 1;
+--- a/netio.h
++++ b/netio.h
+@@ -19,7 +19,7 @@ void get_socket_address(int fd, char **l
+ void getaddrstring(struct sockaddr_storage* addr, 
+ 		char **ret_host, char **ret_port, int host_lookup);
+ int dropbear_listen(const char* address, const char* port,
+-		int *socks, unsigned int sockcount, char **errstring, int *maxfd);
++		int *socks, unsigned int sockcount, char **errstring, int *maxfd, const char* interface);
+ 
+ struct dropbear_progress_connection;
+ 
+--- a/runopts.h
++++ b/runopts.h
+@@ -128,6 +128,7 @@ typedef struct svr_runopts {
+ 	char * pidfile;
+ 
+ 	char * forced_command;
++	char* interface;
+ 
+ #if DROPBEAR_PLUGIN 
+ 	/* malloced */
+--- a/svr-main.c
++++ b/svr-main.c
+@@ -488,7 +488,7 @@ static size_t listensockets(int *socks,
+ 
+ 		nsock = dropbear_listen(svr_opts.addresses[i], svr_opts.ports[i], &socks[sockpos], 
+ 				sockcount - sockpos,
+-				&errstring, maxfd);
++				&errstring, maxfd, svr_opts.interface);
+ 
+ 		if (nsock < 0) {
+ 			dropbear_log(LOG_WARNING, "Failed listening on '%s': %s", 
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -98,6 +98,8 @@ static void printhelp(const char * progn
+ 					"		(default port is %s if none specified)\n"
+ 					"-P PidFile	Create pid file PidFile\n"
+ 					"		(default %s)\n"
++					"-l <interface>\n"
++					"		interface to bind on\n"
+ #if INETD_MODE
+ 					"-i		Start for inetd\n"
+ #endif
+@@ -265,6 +267,9 @@ void svr_getopts(int argc, char ** argv)
+ 				case 'P':
+ 					next = &svr_opts.pidfile;
+ 					break;
++				case 'l':
++					next = &svr_opts.interface;
++					break;
+ #if DO_MOTD
+ 				/* motd is displayed by default, -m turns it off */
+ 				case 'm':
+@@ -438,6 +443,10 @@ void svr_getopts(int argc, char ** argv)
+ 		dropbear_log(LOG_INFO, "Forced command set to '%s'", svr_opts.forced_command);
+ 	}
+ 
++	if (svr_opts.interface) {
++		dropbear_log(LOG_INFO, "Binding to interface '%s'", svr_opts.interface);
++	}
++
+ 	if (reexec_fd_arg) {
+ 		if (m_str_to_uint(reexec_fd_arg, &svr_opts.reexec_childpipe) == DROPBEAR_FAILURE
+ 			|| svr_opts.reexec_childpipe < 0) {
+--- a/svr-tcpfwd.c
++++ b/svr-tcpfwd.c
+@@ -205,6 +205,7 @@ static int svr_remotetcpreq(int *allocat
+ 	tcpinfo->listenport = port;
+ 	tcpinfo->chantype = &svr_chan_tcpremote;
+ 	tcpinfo->tcp_type = forwarded;
++	tcpinfo->interface = svr_opts.interface;
+ 
+ 	tcpinfo->request_listenaddr = request_addr;
+ 	if (!opts.listen_fwd_all || (strcmp(request_addr, "localhost") == 0) ) {
+--- a/tcp-accept.c
++++ b/tcp-accept.c
+@@ -117,7 +117,7 @@ int listen_tcpfwd(struct TCPListener* tc
+ 	snprintf(portstring, sizeof(portstring), "%u", tcpinfo->listenport);
+ 
+ 	nsocks = dropbear_listen(tcpinfo->listenaddr, portstring, socks, 
+-			DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd);
++			DROPBEAR_MAX_SOCKS, &errstring, &ses.maxfd, tcpinfo->interface);
+ 	if (nsocks < 0) {
+ 		dropbear_log(LOG_INFO, "TCP forward failed: %s", errstring);
+ 		m_free(errstring);
+--- a/tcpfwd.h
++++ b/tcpfwd.h
+@@ -42,6 +42,7 @@ struct TCPListener {
+ 	unsigned int listenport;
+ 	/* The address that the remote host asked to listen on */
+ 	char *request_listenaddr;
++	char* interface;
+ 
+ 	const struct ChanType *chantype;
+ 	enum {direct, forwarded} tcp_type;
diff --git a/package/network/services/dropbear/patches/012-add-ifdef-guards-for-SO_BINDTODEVICE.patch b/package/network/services/dropbear/patches/012-add-ifdef-guards-for-SO_BINDTODEVICE.patch
new file mode 100644
index 0000000000..11f902bf90
--- /dev/null
+++ b/package/network/services/dropbear/patches/012-add-ifdef-guards-for-SO_BINDTODEVICE.patch
@@ -0,0 +1,50 @@
+From 031d09b47912b2401f4934667c0b6f857ede61ee Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Tue, 18 Jul 2023 23:20:16 +0800
+Subject: Add ifdef guards for SO_BINDTODEVICE
+
+---
+ netio.c       | 2 ++
+ svr-runopts.c | 4 ++++
+ 2 files changed, 6 insertions(+)
+
+--- a/netio.c
++++ b/netio.c
+@@ -555,10 +555,12 @@ int dropbear_listen(const char* address,
+ 		/* set to reuse, quick timeout */
+ 		setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &val, sizeof(val));
+ 
++#ifdef SO_BINDTODEVICE
+ 		if(interface && setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)) < 0) {
+ 			dropbear_log(LOG_WARNING, "Couldn't set SO_BINDTODEVICE");
+ 			TRACE(("Failed setsockopt with errno failure, %d %s", errno, strerror(errno)))
+ 		}
++#endif
+ 
+ #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
+ 		if (res->ai_family == AF_INET6) {
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -98,8 +98,10 @@ static void printhelp(const char * progn
+ 					"		(default port is %s if none specified)\n"
+ 					"-P PidFile	Create pid file PidFile\n"
+ 					"		(default %s)\n"
++#ifdef SO_BINDTODEVICE
+ 					"-l <interface>\n"
+ 					"		interface to bind on\n"
++#endif
+ #if INETD_MODE
+ 					"-i		Start for inetd\n"
+ #endif
+@@ -267,9 +269,11 @@ void svr_getopts(int argc, char ** argv)
+ 				case 'P':
+ 					next = &svr_opts.pidfile;
+ 					break;
++#ifdef SO_BINDTODEVICE
+ 				case 'l':
+ 					next = &svr_opts.interface;
+ 					break;
++#endif
+ #if DO_MOTD
+ 				/* motd is displayed by default, -m turns it off */
+ 				case 'm':
diff --git a/package/network/services/dropbear/patches/013-make-banner-reading-failure-non-fatal.patch b/package/network/services/dropbear/patches/013-make-banner-reading-failure-non-fatal.patch
new file mode 100644
index 0000000000..531215c757
--- /dev/null
+++ b/package/network/services/dropbear/patches/013-make-banner-reading-failure-non-fatal.patch
@@ -0,0 +1,74 @@
+From 62a06cd95f58060a59359f8769c3f35cd680d4fd Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Sun, 23 Jul 2023 21:01:48 +0800
+Subject: Make banner reading failure non-fatal
+
+---
+ svr-runopts.c | 45 ++++++++++++++++++++++++++++-----------------
+ 1 file changed, 28 insertions(+), 17 deletions(-)
+
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -38,6 +38,7 @@ static void printhelp(const char * progn
+ static void addportandaddress(const char* spec);
+ static void loadhostkey(const char *keyfile, int fatal_duplicate);
+ static void addhostkey(const char *keyfile);
++static void load_banner();
+ 
+ static void printhelp(const char * progname) {
+ 
+@@ -382,23 +383,7 @@ void svr_getopts(int argc, char ** argv)
+ 	}
+ 
+ 	if (svr_opts.bannerfile) {
+-		struct stat buf;
+-		if (stat(svr_opts.bannerfile, &buf) != 0) {
+-			dropbear_exit("Error opening banner file '%s'",
+-					svr_opts.bannerfile);
+-		}
+-		
+-		if (buf.st_size > MAX_BANNER_SIZE) {
+-			dropbear_exit("Banner file too large, max is %d bytes",
+-					MAX_BANNER_SIZE);
+-		}
+-
+-		svr_opts.banner = buf_new(buf.st_size);
+-		if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) {
+-			dropbear_exit("Error reading banner file '%s'",
+-					svr_opts.bannerfile);
+-		}
+-		buf_setpos(svr_opts.banner, 0);
++		load_banner();
+ 	}
+ 
+ #ifdef HAVE_GETGROUPLIST
+@@ -715,3 +700,29 @@ void load_all_hostkeys() {
+ 		dropbear_exit("No hostkeys available. 'dropbear -R' may be useful or run dropbearkey.");
+ 	}
+ }
++
++static void load_banner() {
++	struct stat buf;
++	if (stat(svr_opts.bannerfile, &buf) != 0) {
++		dropbear_log(LOG_WARNING, "Error opening banner file '%s'",
++				svr_opts.bannerfile);
++		return;
++	}
++
++	if (buf.st_size > MAX_BANNER_SIZE) {
++		dropbear_log(LOG_WARNING, "Banner file too large, max is %d bytes",
++				MAX_BANNER_SIZE);
++		return;
++	}
++
++	svr_opts.banner = buf_new(buf.st_size);
++	if (buf_readfile(svr_opts.banner, svr_opts.bannerfile) != DROPBEAR_SUCCESS) {
++		dropbear_log(LOG_WARNING, "Error reading banner file '%s'",
++				svr_opts.bannerfile);
++		buf_free(svr_opts.banner);
++		svr_opts.banner = NULL;
++		return;
++	}
++	buf_setpos(svr_opts.banner, 0);
++
++}
diff --git a/package/network/services/dropbear/patches/014-dropbearkey-ignore-unsupported-command-line-option.patch b/package/network/services/dropbear/patches/014-dropbearkey-ignore-unsupported-command-line-option.patch
new file mode 100644
index 0000000000..ff130f8be0
--- /dev/null
+++ b/package/network/services/dropbear/patches/014-dropbearkey-ignore-unsupported-command-line-option.patch
@@ -0,0 +1,60 @@
+From ec26975d442163b66d1646a48e022bc8c2f1607a Mon Sep 17 00:00:00 2001
+From: Sergey Ponomarev <stokito@gmail.com>
+Date: Sun, 27 Aug 2023 00:07:05 +0300
+Subject: dropbearkey.c Ignore unsupported command line options
+
+To generate non interactively a key with OpenSSH the simplest command is:
+
+ssh-keygen -t ed25519 -q -N '' -f ~/.ssh/id_ed25519
+
+The command has two options -q quiet and -N passphrase which aren't supported by the dropbearkey.
+
+To improve interoperability add explicit ignoring of the -q and -N with empty passphrase.
+Also ignore the -v even if the DEBUG_TRACE is not set.
+
+Signed-off-by: Sergey Ponomarev <stokito@gmail.com>
+---
+ dropbearkey.c | 15 +++++++++++++--
+ 1 file changed, 13 insertions(+), 2 deletions(-)
+
+--- a/dropbearkey.c
++++ b/dropbearkey.c
+@@ -159,6 +159,7 @@ int main(int argc, char ** argv) {
+ 	enum signkey_type keytype = DROPBEAR_SIGNKEY_NONE;
+ 	char * typetext = NULL;
+ 	char * sizetext = NULL;
++	char * passphrase = NULL;
+ 	unsigned int bits = 0, genbits;
+ 	int printpub = 0;
+ 
+@@ -194,11 +195,16 @@ int main(int argc, char ** argv) {
+ 					printhelp(argv[0]);
+ 					exit(EXIT_SUCCESS);
+ 					break;
+-#if DEBUG_TRACE
+ 				case 'v':
++#if DEBUG_TRACE
+ 					debug_trace = DROPBEAR_VERBOSE_LEVEL;
+-					break;
+ #endif
++					break;
++				case 'q':
++					break;  /* quiet is default */
++				case 'N':
++					next = &passphrase;
++					break;
+ 				default:
+ 					fprintf(stderr, "Unknown argument %s\n", argv[i]);
+ 					printhelp(argv[0]);
+@@ -266,6 +272,11 @@ int main(int argc, char ** argv) {
+ 		check_signkey_bits(keytype, bits);;
+ 	}
+ 
++	if (passphrase && *passphrase != '\0') {
++		fprintf(stderr, "Only empty passphrase is supported\n");
++		exit(EXIT_FAILURE);
++	}
++
+ 	genbits = signkey_generate_get_bits(keytype, bits);
+ 	fprintf(stderr, "Generating %u bit %s key, this may take a while...\n", genbits, typetext);
+ 	if (signkey_generate(keytype, bits, filename, 0) == DROPBEAR_FAILURE)
diff --git a/package/network/services/dropbear/patches/015-libtommath-fix-possible-integer-overflow.patch b/package/network/services/dropbear/patches/015-libtommath-fix-possible-integer-overflow.patch
new file mode 100644
index 0000000000..f39417adb7
--- /dev/null
+++ b/package/network/services/dropbear/patches/015-libtommath-fix-possible-integer-overflow.patch
@@ -0,0 +1,121 @@
+From 3b576d95dcf791d7b945e75f639da8f89c1685a2 Mon Sep 17 00:00:00 2001
+From: czurnieden <czurnieden@gmx.de>
+Date: Tue, 9 May 2023 17:17:12 +0200
+Subject: Fix possible integer overflow
+
+---
+ libtommath/bn_mp_2expt.c                | 4 ++++
+ libtommath/bn_mp_grow.c                 | 4 ++++
+ libtommath/bn_mp_init_size.c            | 5 +++++
+ libtommath/bn_mp_mul_2d.c               | 4 ++++
+ libtommath/bn_s_mp_mul_digs.c           | 4 ++++
+ libtommath/bn_s_mp_mul_digs_fast.c      | 4 ++++
+ libtommath/bn_s_mp_mul_high_digs.c      | 4 ++++
+ libtommath/bn_s_mp_mul_high_digs_fast.c | 4 ++++
+ 8 files changed, 33 insertions(+)
+
+--- a/libtommath/bn_mp_2expt.c
++++ b/libtommath/bn_mp_2expt.c
+@@ -12,6 +12,10 @@ mp_err mp_2expt(mp_int *a, int b)
+ {
+    mp_err    err;
+ 
++   if (b < 0) {
++      return MP_VAL;
++   }
++
+    /* zero a as per default */
+    mp_zero(a);
+ 
+--- a/libtommath/bn_mp_grow.c
++++ b/libtommath/bn_mp_grow.c
+@@ -9,6 +9,10 @@ mp_err mp_grow(mp_int *a, int size)
+    int     i;
+    mp_digit *tmp;
+ 
++   if (size < 0) {
++      return MP_VAL;
++   }
++
+    /* if the alloc size is smaller alloc more ram */
+    if (a->alloc < size) {
+       /* reallocate the array a->dp
+--- a/libtommath/bn_mp_init_size.c
++++ b/libtommath/bn_mp_init_size.c
+@@ -6,6 +6,11 @@
+ /* init an mp_init for a given size */
+ mp_err mp_init_size(mp_int *a, int size)
+ {
++
++   if (size < 0) {
++      return MP_VAL;
++   }
++
+    size = MP_MAX(MP_MIN_PREC, size);
+ 
+    /* alloc mem */
+--- a/libtommath/bn_mp_mul_2d.c
++++ b/libtommath/bn_mp_mul_2d.c
+@@ -9,6 +9,10 @@ mp_err mp_mul_2d(const mp_int *a, int b,
+    mp_digit d;
+    mp_err   err;
+ 
++   if (b < 0) {
++      return MP_VAL;
++   }
++
+    /* copy */
+    if (a != c) {
+       if ((err = mp_copy(a, c)) != MP_OKAY) {
+--- a/libtommath/bn_s_mp_mul_digs.c
++++ b/libtommath/bn_s_mp_mul_digs.c
+@@ -16,6 +16,10 @@ mp_err s_mp_mul_digs(const mp_int *a, co
+    mp_word r;
+    mp_digit tmpx, *tmpt, *tmpy;
+ 
++   if (digs < 0) {
++      return MP_VAL;
++   }
++
+    /* can we use the fast multiplier? */
+    if ((digs < MP_WARRAY) &&
+        (MP_MIN(a->used, b->used) < MP_MAXFAST)) {
+--- a/libtommath/bn_s_mp_mul_digs_fast.c
++++ b/libtommath/bn_s_mp_mul_digs_fast.c
+@@ -26,6 +26,10 @@ mp_err s_mp_mul_digs_fast(const mp_int *
+    mp_digit W[MP_WARRAY];
+    mp_word  _W;
+ 
++   if (digs < 0) {
++      return MP_VAL;
++   }
++
+    /* grow the destination as required */
+    if (c->alloc < digs) {
+       if ((err = mp_grow(c, digs)) != MP_OKAY) {
+--- a/libtommath/bn_s_mp_mul_high_digs.c
++++ b/libtommath/bn_s_mp_mul_high_digs.c
+@@ -15,6 +15,10 @@ mp_err s_mp_mul_high_digs(const mp_int *
+    mp_word  r;
+    mp_digit tmpx, *tmpt, *tmpy;
+ 
++   if (digs < 0) {
++      return MP_VAL;
++   }
++
+    /* can we use the fast multiplier? */
+    if (MP_HAS(S_MP_MUL_HIGH_DIGS_FAST)
+        && ((a->used + b->used + 1) < MP_WARRAY)
+--- a/libtommath/bn_s_mp_mul_high_digs_fast.c
++++ b/libtommath/bn_s_mp_mul_high_digs_fast.c
+@@ -19,6 +19,10 @@ mp_err s_mp_mul_high_digs_fast(const mp_
+    mp_digit W[MP_WARRAY];
+    mp_word  _W;
+ 
++   if (digs < 0) {
++      return MP_VAL;
++   }
++
+    /* grow the destination as required */
+    pa = a->used + b->used;
+    if (c->alloc < pa) {
diff --git a/package/network/services/dropbear/patches/016-src-svr-tcpfwd-Fix-noremotetcp-behavior.patch b/package/network/services/dropbear/patches/016-src-svr-tcpfwd-Fix-noremotetcp-behavior.patch
new file mode 100644
index 0000000000..b6933120e6
--- /dev/null
+++ b/package/network/services/dropbear/patches/016-src-svr-tcpfwd-Fix-noremotetcp-behavior.patch
@@ -0,0 +1,35 @@
+From 3cf8344769eda55e26eee53c1898b2c66544f188 Mon Sep 17 00:00:00 2001
+From: Justin Chen <justin.chen@broadcom.com>
+Date: Fri, 8 Sep 2023 11:35:18 -0700
+Subject: src: svr-tcpfwd: Fix noremotetcp behavior
+
+If noremotetcp is set, we should still reply with
+send_msg_request_failed. This matches the behavior
+of !DROPBEAR_SVR_REMOTETCPFWD.
+
+We were seeing keepalive packets being ignored when
+the "-k" option was used.
+---
+ svr-tcpfwd.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+--- a/svr-tcpfwd.c
++++ b/svr-tcpfwd.c
+@@ -79,14 +79,14 @@ void recv_msg_global_request_remotetcp()
+ 
+ 	TRACE(("enter recv_msg_global_request_remotetcp"))
+ 
++	reqname = buf_getstring(ses.payload, &namelen);
++	wantreply = buf_getbool(ses.payload);
++
+ 	if (svr_opts.noremotetcp || !svr_pubkey_allows_tcpfwd()) {
+ 		TRACE(("leave recv_msg_global_request_remotetcp: remote tcp forwarding disabled"))
+ 		goto out;
+ 	}
+ 
+-	reqname = buf_getstring(ses.payload, &namelen);
+-	wantreply = buf_getbool(ses.payload);
+-
+ 	if (namelen > MAX_NAME_LEN) {
+ 		TRACE(("name len is wrong: %d", namelen))
+ 		goto out;
diff --git a/package/network/services/dropbear/patches/017-Don-t-try-to-shutdown-a-pty.patch b/package/network/services/dropbear/patches/017-Don-t-try-to-shutdown-a-pty.patch
new file mode 100644
index 0000000000..603c61d6fb
--- /dev/null
+++ b/package/network/services/dropbear/patches/017-Don-t-try-to-shutdown-a-pty.patch
@@ -0,0 +1,32 @@
+From e28ba1b9975eab48799aa3ed77d3cd91627d7b27 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Sat, 9 Dec 2023 23:10:41 +0800
+Subject: Don't try to shutdown() a pty
+
+shutdown() of a pty doesn't work (ENOTSOCK), so we should close
+it instead.
+
+This will ensure that PTY controlling terminals are closed when a
+session exits, including when multiple sessions run over a single SSH
+connection.  In the normal case of a single session, the PTY controlling
+terminal would be closed when the Dropbear server process exits anyway.
+
+This possibly fixes #264 on github
+
+It is possible that there could be subtle changes to PTY flushing
+behaviour, though nothing caught by tests at present.
+---
+ svr-chansession.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/svr-chansession.c
++++ b/svr-chansession.c
+@@ -910,7 +910,7 @@ static int ptycommand(struct Channel *ch
+ 		channel->readfd = chansess->master;
+ 		/* don't need to set stderr here */
+ 		ses.maxfd = MAX(ses.maxfd, chansess->master);
+-		channel->bidir_fd = 1;
++		channel->bidir_fd = 0;
+ 
+ 		setnonblocking(chansess->master);
+ 
diff --git a/package/network/services/dropbear/patches/018-dropbearkey-add-alias-to-ssh-keygen.patch b/package/network/services/dropbear/patches/018-dropbearkey-add-alias-to-ssh-keygen.patch
new file mode 100644
index 0000000000..9c70c3141c
--- /dev/null
+++ b/package/network/services/dropbear/patches/018-dropbearkey-add-alias-to-ssh-keygen.patch
@@ -0,0 +1,33 @@
+From 806586b585806cbe32013bcd3af3847278972060 Mon Sep 17 00:00:00 2001
+From: Sergey Ponomarev <stokito@gmail.com>
+Date: Sun, 10 Dec 2023 10:31:56 +0200
+Subject: dropbearkey: add alias to ssh-keygen
+
+The dropbearkey is partially compatible with ssh-keygen and can be used as an alias.
+
+Closes: #263
+---
+ dbmulti.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+--- a/dbmulti.c
++++ b/dbmulti.c
+@@ -41,7 +41,8 @@ static int runprog(const char *multipath
+ 		}
+ #endif
+ #ifdef DBMULTI_dropbearkey
+-		if (strcmp(progname, "dropbearkey") == 0) {
++		if (strcmp(progname, "dropbearkey") == 0
++				|| strcmp(progname, "ssh-keygen") == 0) {
+ 			return dropbearkey_main(argc, argv);
+ 		}
+ #endif
+@@ -88,7 +89,7 @@ int main(int argc, char ** argv) {
+ 			"'dbclient' or 'ssh' - the Dropbear client\n"
+ #endif
+ #ifdef DBMULTI_dropbearkey
+-			"'dropbearkey' - the key generator\n"
++			"'dropbearkey' or 'ssh-keygen' - the key generator\n"
+ #endif
+ #ifdef DBMULTI_dropbearconvert
+ 			"'dropbearconvert' - the key converter\n"
diff --git a/package/network/services/dropbear/patches/019-Allow-inetd-with-non-syslog.patch b/package/network/services/dropbear/patches/019-Allow-inetd-with-non-syslog.patch
new file mode 100644
index 0000000000..3544f2123c
--- /dev/null
+++ b/package/network/services/dropbear/patches/019-Allow-inetd-with-non-syslog.patch
@@ -0,0 +1,34 @@
+From 383cc8c97a9420aad9cf93d88e77ec636b183a9d Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Mon, 11 Dec 2023 23:18:09 +0800
+Subject: Allow inetd with non-syslog
+
+An inetd-alike should be able to distinguish stdout and stderr, so
+it's a valid configuration.
+
+Fixes #218 on github
+---
+ svr-runopts.c | 12 ------------
+ 1 file changed, 12 deletions(-)
+
+--- a/svr-runopts.c
++++ b/svr-runopts.c
+@@ -443,18 +443,6 @@ void svr_getopts(int argc, char ** argv)
+ 		}
+ 	}
+ 
+-#if INETD_MODE
+-	if (svr_opts.inetdmode && (
+-		opts.usingsyslog == 0
+-#if DEBUG_TRACE
+-		|| debug_trace
+-#endif
+-		)) {
+-		/* log output goes to stderr which would get sent over the inetd network socket */
+-		dropbear_exit("Dropbear inetd mode is incompatible with debug -v or non-syslog");
+-	}
+-#endif
+-
+ 	if (svr_opts.multiauthmethod && svr_opts.noauthpass) {
+ 		dropbear_exit("-t and -s are incompatible");
+ 	}
diff --git a/package/network/services/dropbear/patches/020-Fix-test-for-multiuser-kernels.patch b/package/network/services/dropbear/patches/020-Fix-test-for-multiuser-kernels.patch
new file mode 100644
index 0000000000..8d016faa9c
--- /dev/null
+++ b/package/network/services/dropbear/patches/020-Fix-test-for-multiuser-kernels.patch
@@ -0,0 +1,33 @@
+From 9ac650401ffc2fb05c9328d26e76a5e7ae39152a Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Mon, 11 Dec 2023 23:31:22 +0800
+Subject: Fix test for multiuser kernels
+
+getuid() succeeds even on non-multiuser kernels. Instead
+getgroups() is a valid test.
+
+Fixes #214 on github
+---
+ common-session.c | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+--- a/common-session.c
++++ b/common-session.c
+@@ -71,10 +71,13 @@ void common_session_init(int sock_in, in
+ #if !DROPBEAR_SVR_MULTIUSER
+ 	/* A sanity check to prevent an accidental configuration option
+ 	   leaving multiuser systems exposed */
+-	errno = 0;
+-	getuid();
+-	if (errno != ENOSYS) {
+-		dropbear_exit("Non-multiuser Dropbear requires a non-multiuser kernel");
++	{
++		int ret;
++		errno = 0;
++		ret = getgroups(0, NULL);
++		if (!(ret == -1 && errno == ENOSYS)) {
++			dropbear_exit("Non-multiuser Dropbear requires a non-multiuser kernel");
++		}
+ 	}
+ #endif
+ 
diff --git a/package/network/services/dropbear/patches/021-Implement-Strict-KEX-mode.patch b/package/network/services/dropbear/patches/021-Implement-Strict-KEX-mode.patch
new file mode 100644
index 0000000000..d490d9545a
--- /dev/null
+++ b/package/network/services/dropbear/patches/021-Implement-Strict-KEX-mode.patch
@@ -0,0 +1,216 @@
+From 6e43be5c7b99dbee49dc72b6f989f29fdd7e9356 Mon Sep 17 00:00:00 2001
+From: Matt Johnston <matt@ucc.asn.au>
+Date: Mon, 20 Nov 2023 14:02:47 +0800
+Subject: Implement Strict KEX mode
+
+As specified by OpenSSH with kex-strict-c-v00@openssh.com and
+kex-strict-s-v00@openssh.com.
+---
+ cli-session.c    | 11 +++++++++++
+ common-algo.c    |  6 ++++++
+ common-kex.c     | 26 +++++++++++++++++++++++++-
+ kex.h            |  3 +++
+ process-packet.c | 34 +++++++++++++++++++---------------
+ ssh.h            |  4 ++++
+ svr-session.c    |  3 +++
+ 7 files changed, 71 insertions(+), 16 deletions(-)
+
+--- a/cli-session.c
++++ b/cli-session.c
+@@ -46,6 +46,7 @@ static void cli_finished(void) ATTRIB_NO
+ static void recv_msg_service_accept(void);
+ static void cli_session_cleanup(void);
+ static void recv_msg_global_request_cli(void);
++static void cli_algos_initialise(void);
+ 
+ struct clientsession cli_ses; /* GLOBAL */
+ 
+@@ -117,6 +118,7 @@ void cli_session(int sock_in, int sock_o
+ 	}
+ 
+ 	chaninitialise(cli_chantypes);
++	cli_algos_initialise();
+ 
+ 	/* Set up cli_ses vars */
+ 	cli_session_init(proxy_cmd_pid);
+@@ -487,3 +489,12 @@ void cli_dropbear_log(int priority, cons
+ 	fflush(stderr);
+ }
+ 
++static void cli_algos_initialise(void) {
++	algo_type *algo;
++	for (algo = sshkex; algo->name; algo++) {
++		if (strcmp(algo->name, SSH_STRICT_KEX_S) == 0) {
++			algo->usable = 0;
++		}
++	}
++}
++
+--- a/common-algo.c
++++ b/common-algo.c
+@@ -308,6 +308,12 @@ algo_type sshkex[] = {
+ 	{SSH_EXT_INFO_C, 0, NULL, 1, NULL},
+ #endif
+ #endif
++#if DROPBEAR_CLIENT
++	{SSH_STRICT_KEX_C, 0, NULL, 1, NULL},
++#endif
++#if DROPBEAR_SERVER
++	{SSH_STRICT_KEX_S, 0, NULL, 1, NULL},
++#endif
+ 	{NULL, 0, NULL, 0, NULL}
+ };
+ 
+--- a/common-kex.c
++++ b/common-kex.c
+@@ -183,6 +183,10 @@ void send_msg_newkeys() {
+ 	gen_new_keys();
+ 	switch_keys();
+ 
++	if (ses.kexstate.strict_kex) {
++		ses.transseq = 0;
++	}
++
+ 	TRACE(("leave send_msg_newkeys"))
+ }
+ 
+@@ -193,7 +197,11 @@ void recv_msg_newkeys() {
+ 
+ 	ses.kexstate.recvnewkeys = 1;
+ 	switch_keys();
+-	
++
++	if (ses.kexstate.strict_kex) {
++		ses.recvseq = 0;
++	}
++
+ 	TRACE(("leave recv_msg_newkeys"))
+ }
+ 
+@@ -550,6 +558,10 @@ void recv_msg_kexinit() {
+ 
+ 	ses.kexstate.recvkexinit = 1;
+ 
++	if (ses.kexstate.strict_kex && !ses.kexstate.donefirstkex && ses.recvseq != 1) {
++		dropbear_exit("First packet wasn't kexinit");
++	}
++
+ 	TRACE(("leave recv_msg_kexinit"))
+ }
+ 
+@@ -859,6 +871,18 @@ static void read_kex_algos() {
+ 	}
+ #endif
+ 
++	if (!ses.kexstate.donefirstkex) {
++		const char* strict_name;
++		if (IS_DROPBEAR_CLIENT) {
++			strict_name = SSH_STRICT_KEX_S;
++		} else {
++			strict_name = SSH_STRICT_KEX_C;
++		}
++		if (buf_has_algo(ses.payload, strict_name) == DROPBEAR_SUCCESS) {
++			ses.kexstate.strict_kex = 1;
++		}
++	}
++
+ 	algo = buf_match_algo(ses.payload, sshkex, kexguess2, &goodguess);
+ 	allgood &= goodguess;
+ 	if (algo == NULL || algo->data == NULL) {
+--- a/kex.h
++++ b/kex.h
+@@ -83,6 +83,9 @@ struct KEXState {
+ 
+ 	unsigned our_first_follows_matches : 1;
+ 
++	/* Boolean indicating that strict kex mode is in use */
++	unsigned int strict_kex;
++
+ 	time_t lastkextime; /* time of the last kex */
+ 	unsigned int datatrans; /* data transmitted since last kex */
+ 	unsigned int datarecv; /* data received since last kex */
+--- a/process-packet.c
++++ b/process-packet.c
+@@ -44,6 +44,7 @@ void process_packet() {
+ 
+ 	unsigned char type;
+ 	unsigned int i;
++	unsigned int first_strict_kex = ses.kexstate.strict_kex && !ses.kexstate.donefirstkex;
+ 	time_t now;
+ 
+ 	TRACE2(("enter process_packet"))
+@@ -54,22 +55,24 @@ void process_packet() {
+ 	now = monotonic_now();
+ 	ses.last_packet_time_keepalive_recv = now;
+ 
+-	/* These packets we can receive at any time */
+-	switch(type) {
+ 
+-		case SSH_MSG_IGNORE:
+-			goto out;
+-		case SSH_MSG_DEBUG:
+-			goto out;
+-
+-		case SSH_MSG_UNIMPLEMENTED:
+-			/* debugging XXX */
+-			TRACE(("SSH_MSG_UNIMPLEMENTED"))
+-			goto out;
+-			
+-		case SSH_MSG_DISCONNECT:
+-			/* TODO cleanup? */
+-			dropbear_close("Disconnect received");
++	if (type == SSH_MSG_DISCONNECT) {
++		/* Allowed at any time */
++		dropbear_close("Disconnect received");
++	}
++
++	/* These packets may be received at any time,
++	   except during first kex with strict kex */
++	if (!first_strict_kex) {
++		switch(type) {
++			case SSH_MSG_IGNORE:
++				goto out;
++			case SSH_MSG_DEBUG:
++				goto out;
++			case SSH_MSG_UNIMPLEMENTED:
++				TRACE(("SSH_MSG_UNIMPLEMENTED"))
++				goto out;
++		}
+ 	}
+ 
+ 	/* Ignore these packet types so that keepalives don't interfere with
+@@ -98,7 +101,8 @@ void process_packet() {
+ 			if (type >= 1 && type <= 49
+ 				&& type != SSH_MSG_SERVICE_REQUEST
+ 				&& type != SSH_MSG_SERVICE_ACCEPT
+-				&& type != SSH_MSG_KEXINIT)
++				&& type != SSH_MSG_KEXINIT
++				&& !first_strict_kex)
+ 			{
+ 				TRACE(("unknown allowed packet during kexinit"))
+ 				recv_unimplemented();
+--- a/ssh.h
++++ b/ssh.h
+@@ -100,6 +100,10 @@
+ #define SSH_EXT_INFO_C "ext-info-c"
+ #define SSH_SERVER_SIG_ALGS "server-sig-algs"
+ 
++/* OpenSSH strict KEX feature */
++#define SSH_STRICT_KEX_S "kex-strict-s-v00@openssh.com"
++#define SSH_STRICT_KEX_C "kex-strict-c-v00@openssh.com"
++
+ /* service types */
+ #define SSH_SERVICE_USERAUTH "ssh-userauth"
+ #define SSH_SERVICE_USERAUTH_LEN 12
+--- a/svr-session.c
++++ b/svr-session.c
+@@ -370,6 +370,9 @@ static void svr_algos_initialise(void) {
+ 			algo->usable = 0;
+ 		}
+ #endif
++		if (strcmp(algo->name, SSH_STRICT_KEX_C) == 0) {
++			algo->usable = 0;
++		}
+ 	}
+ }
+ 
diff --git a/package/network/services/dropbear/patches/910-signkey-fix-use-of-rsa-sha2-256-pubkeys.patch b/package/network/services/dropbear/patches/910-signkey-fix-use-of-rsa-sha2-256-pubkeys.patch
index f078814403..442fdcfc75 100644
--- a/package/network/services/dropbear/patches/910-signkey-fix-use-of-rsa-sha2-256-pubkeys.patch
+++ b/package/network/services/dropbear/patches/910-signkey-fix-use-of-rsa-sha2-256-pubkeys.patch
@@ -21,7 +21,7 @@ Signed-off-by: Petr Štetiar <ynezz@true.cz>
 
 --- a/signkey.c
 +++ b/signkey.c
-@@ -646,8 +646,12 @@ int buf_verify(buffer * buf, sign_key *k
+@@ -652,8 +652,12 @@ int buf_verify(buffer * buf, sign_key *k
  	sigtype = signature_type_from_name(type_name, type_name_len);
  	m_free(type_name);