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sshserver.pl: add option to enable KEX algorithms in sshd

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Necessary when the libssh2/libssh client library does not support KEX
algos offered by default by the OpenSSH server. E.g. libssh2 with WinCNG
combined with OpenSSH 10+.

Also: use this option in GHA/windows.

Follow-up to 3b8bb1a86a #21219
Follow-up to c98d0a2e9a #21220

Closes #21438
This commit is contained in:
Viktor Szakats 2026-04-24 13:31:53 +02:00
parent d19a039472
commit 41f3f94d91
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2 changed files with 5 additions and 0 deletions
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2
.github/workflows/windows.yml vendored
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@ -510,6 +510,7 @@ jobs:
if [[ "${MATRIX_INSTALL}" = *'libssh2-wincng'* ]]; then
TFLAGS+=' ~SCP ~SFTP' # Flaky: `-8, Unable to exchange encryption keys`. https://github.com/libssh2/libssh2/issues/804
unset CURL_TEST_SSH_KEYALGO # libssh2 built with WinCNG does not support ssh-ed25519 hostkeys
export CURL_TEST_SSH_ENABLE_KEX=diffie-hellman-group-exchange-sha256
fi
if [[ "${TFLAGS}" = *'-t'* ]]; then
TFLAGS+=' !2300' # Leaks memory and file handle via tool_doswin.c / win32_stdin_read_thread()
@ -1164,6 +1165,7 @@ jobs:
"${MATRIX_INSTALL_VCPKG}" = *'libssh2[core,zlib]'* ]]; then
TFLAGS+=' ~SCP ~SFTP' # Flaky: `-8, Unable to exchange encryption keys`. https://github.com/libssh2/libssh2/issues/804
unset CURL_TEST_SSH_KEYALGO # libssh2 built with WinCNG does not support ssh-ed25519 hostkeys
export CURL_TEST_SSH_ENABLE_KEX=diffie-hellman-group-exchange-sha256
fi
if [ -n "${MATRIX_OPENSSH}" ]; then # OpenSSH-Windows
TFLAGS+=' ~601 ~603 ~617 ~619 ~621 ~641 ~665 ~2004' # SCP