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Add support for keyboard-interactive authentication #244

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16 changes: 14 additions & 2 deletions spread/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,20 @@ type Client struct {

func Dial(server Server, username, password string) (*Client, error) {
config := &ssh.ClientConfig{
User: username,
Auth: []ssh.AuthMethod{ssh.Password(password)},
User: username,
Auth: []ssh.AuthMethod{
ssh.Password(password),
ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) ([]string, error) {
answers := make([]string, len(questions))
for i, _ := range questions {
if questions[i] == "Password: " {
answers[i] = password
}
Comment on lines +46 to +48
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@bboozzoo bboozzoo Jun 30, 2025

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is this part driven by PAM?

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@zyga zyga Jul 1, 2025

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I presume it is. Gentoo ships those override files in their images:

root@gentoo /etc/ssh/sshd_config.d # ls -la
total 12
drwxr-xr-x 2 root root 128 Jun 22 23:57 .
drwxr-xr-x 4 root root 291 Jul  1 07:17 ..
lrwxrwxrwx 1 root root  61 Jun 22 23:56 20-systemd-userdb.conf -> ../../../usr/lib/systemd/sshd_config.d/20-systemd-userdb.conf
-rw------- 1 root root 316 Jun  1 19:22 9999999gentoo.conf
-rw------- 1 root root 133 Jun  1 19:22 9999999gentoo-pam.conf
-rw------- 1 root root  79 Jun  1 19:22 9999999gentoo-subsystem.conf

root@gentoo /etc/ssh/sshd_config.d # cat 9999999gentoo*
# Allow client to pass locale environment variables (bug #367017)
AcceptEnv LANG LC_ALL LC_COLLATE LC_CTYPE LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME LANGUAGE LC_ADDRESS LC_IDENTIFICATION LC_MEASUREMENT LC_NAME LC_PAPER LC_TELEPHONE

# Allow client to pass COLORTERM to match TERM (bug #658540)
AcceptEnv COLORTERM
UsePAM yes
# This interferes with PAM.
PasswordAuthentication no
# PAM can do its own handling of MOTD.
PrintMotd no
PrintLastLog no
# override default of no subsystems
Subsystem	sftp	/usr/lib64/misc/sftp-server

}

return answers, nil
}),
},
Timeout: 10 * time.Second,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
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