Add support for keyboard-interactive authentication #244
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zyga
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This makes spread able to authenticate to systems that do not allow plaintext passwords but DO allow keyboard-interactive authentication. Some newer systems use such method as there are some PAM interactions that prevent plaintext passwords from working (Gentoo). Fixes: canonical#243 Signed-off-by: Zygmunt Krynicki <me@zygoon.pl>
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bboozzoo
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Jun 30, 2025
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| if questions[i] == "Password: " { | ||
| answers[i] = password | ||
| } |
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is this part driven by PAM?
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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
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This makes spread able to authenticate to systems that do not allow plaintext passwords but DO allow keyboard-interactive authentication. Some newer systems use such method as there are some PAM interactions that prevent plaintext passwords from working (Gentoo).
Fixes: #243