database64128 b53964a1ca ssh: permit empty but non-nil HostKeyAlgorithms, KeyExchanges, Ciphers, MACs ...

The documentation of ClientConfig.HostKeyAlgorithms says:

  If empty, a reasonable default is used.

However, if HostKeyAlgorithms is empty but non-nil, the reasonable
default won't be applied, and the SSH handshake will fail. Fix this by
changing the nil check to a length check.

While here, do the same for KeyExchanges, Ciphers, MACs in Config.

Change-Id: I1b3d2d2159f3c7d57a9a690ad04f1f6818b39a5c
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/800080
Reviewed-by: Nicola Murino <nicola.murino@gmail.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Nicola Murino <nicola.murino@gmail.com>

2026-07-22 10:37:01 -07:00

..

agent

all: clean up minor issues found by staticcheck

2026-07-21 14:30:59 -07:00

internal/bcrypt_pbkdf

ssh: support encrypted OpenSSH private keys

2020-02-04 10:40:54 +00:00

knownhosts

ssh/knownhosts: reject lines with multiple or unknown markers

2026-06-02 00:24:36 -07:00

terminal

ssh/terminal: replace with a golang.org/x/term wrapper

2020-11-16 15:36:03 +00:00

test

ssh/test: isolate CLI tests from user SSH config and agent

2026-06-02 00:25:33 -07:00

testdata

ssh: fix error message on unsupported cipher

2025-11-12 10:42:48 -08:00

benchmark_test.go

ssh: fix call to Fatalf from a non-test goroutine

2023-07-31 18:14:41 +00:00

buffer_test.go

all: clean up minor issues found by staticcheck

2026-07-21 14:30:59 -07:00

buffer.go

ssh: remove unused buffer.eof return value

2017-09-25 11:19:01 +00:00

certs_test.go

ssh: enforce user presence verification for security keys

2026-05-21 17:03:20 -07:00

certs.go

ssh: enforce user presence verification for security keys

2026-05-21 17:03:20 -07:00

channel_test.go

ssh: fix infinite loop on large channel writes due to integer overflow

2026-05-21 17:03:23 -07:00

channel.go

ssh: initialize new channels fully before adding them to chanList

2026-07-12 08:19:12 -07:00

cipher_test.go

ssh: expose negotiated algorithms

2025-05-15 10:44:04 -07:00

cipher.go

ssh: fix incorrect operator order

2026-05-21 17:03:25 -07:00

client_auth_test.go

ssh: don't close the connection on an unparseable public key

2026-07-13 12:20:29 -07:00

client_auth.go

ssh: sanitize various error messages

2026-07-13 12:23:17 -07:00

client_test.go

ssh: export supported algorithms

2025-05-15 10:43:30 -07:00

client.go

ssh: add openssh controlmaster socket support

2026-05-21 19:39:36 -07:00

common_test.go

ssh: return clearer error when signature algorithm is used as key format

2025-09-15 23:32:56 -07:00

common.go

ssh: permit empty but non-nil HostKeyAlgorithms, KeyExchanges, Ciphers, MACs

2026-07-22 10:37:01 -07:00

connection.go

ssh: sanitize various error messages

2026-07-13 12:23:17 -07:00

control_test.go

ssh: add openssh controlmaster socket support

2026-05-21 19:39:36 -07:00

control.go

ssh: add openssh controlmaster socket support

2026-05-21 19:39:36 -07:00

doc.go

ssh: add support for FIPS mode

2025-09-27 12:36:52 -07:00

example_test.go

all: fix some typos in comment

2025-10-08 13:58:26 -07:00

handshake_test.go

all: clean up minor issues found by staticcheck

2026-07-21 14:30:59 -07:00

handshake.go

ssh: permit empty but non-nil HostKeyAlgorithms, KeyExchanges, Ciphers, MACs

2026-07-22 10:37:01 -07:00

kex_test.go

ssh: improve DH GEX group selection using PreferredBits

2026-06-02 00:23:03 -07:00

kex.go

ssh: improve DH GEX group selection using PreferredBits

2026-06-02 00:23:03 -07:00

keys_test.go

all: clean up minor issues found by staticcheck

2026-07-21 14:30:59 -07:00

keys.go

ssh: raise the RSA modulus limit to 16384 bits

2026-07-13 20:33:21 -07:00

mac.go

ssh: add support for FIPS mode

2025-09-27 12:36:52 -07:00

mempipe_test.go

ssh: defer channel window adjustment

2023-11-27 17:27:49 +00:00

messages_test.go

ssh: sanitize various error messages

2026-07-13 12:23:17 -07:00

messages.go

ssh: sanitize various error messages

2026-07-13 12:23:17 -07:00

mlkem.go

ssh: remove Go 1.24 build tag for ML-KEM kex

2025-08-26 00:42:33 -07:00

mux_test.go

ssh: sanitize various error messages

2026-07-13 12:23:17 -07:00

mux.go

ssh: initialize new channels fully before adding them to chanList

2026-07-12 08:19:12 -07:00

server_multi_auth_test.go

ssh: fix data race in the doClientServerAuth test helper

2026-07-12 08:19:29 -07:00

server_test.go

ssh: report verified signature format to callback

2026-07-17 15:41:46 -07:00

server.go

ssh: report verified signature format to callback

2026-07-17 15:41:46 -07:00

session_test.go

all: clean up minor issues found by staticcheck

2026-07-21 14:30:59 -07:00

session.go

ssh: prevent malformed exit-status panic

2026-05-25 19:49:21 -07:00

ssh_gss_test.go

ssh: curb GSSAPI DoS risk by limiting number of specified OIDs

2025-11-19 11:28:37 -08:00

ssh_gss.go

ssh: curb GSSAPI DoS risk by limiting number of specified OIDs

2025-11-19 11:28:37 -08:00

streamlocal.go

ssh: drain stderr on forwarded TCP and Unix channels

2026-07-22 10:34:36 -07:00

tcpip_test.go

ssh: drain stderr on forwarded TCP and Unix channels

2026-07-22 10:34:36 -07:00

tcpip.go

ssh: drain stderr on forwarded TCP and Unix channels

2026-07-22 10:34:36 -07:00

testdata_test.go

ssh: don't advertise rsa-sha2 algorithms if we can't use them

2022-03-14 23:46:59 +00:00

transport_test.go

ssh: fix protocol version exchange (for multi-line)

2018-01-11 10:11:23 +00:00

transport.go

ssh: add support for FIPS mode

2025-09-27 12:36:52 -07:00