[LEDE-DEV] [PATCH v1 1/1] openssh: disable passwords for openssh server

[Paul Oranje]

Wouldn't it be appropriate to disallow password authentication on wan only and allow it on all networks "behind" the router?


> Op 9 feb. 2018, om 01:28 heeft Philip Prindeville <philipp at redfish-solutions.com> het volgende geschreven:
> 
> From: Philip Prindeville <philipp at redfish-solutions.com>
> 
> Allowing password logins leaves you vulnerable to dictionary
> attacks.  We disable password-based authentication, limiting
> authentication to keys only which are more secure.
> 
> Note: You'll need to pre-populate your image with some initial
> keys. To do this:
> 
> 1. Create the appropriate directory as "mkdir -p files/root/.ssh"
>   from your top-level directory;
> 2. Copy your "~/.ssh/id_rsa.pub" (or as appropriate) into
>   "files/root/.ssh/authorized_keys" and indeed, you can collect
>   keys from several sources this way by concatenating them;
> 3. Set the permissions on "authorized_keys" to 644 or 640.
> 
> Signed-off-by: Philip Prindeville <philipp at redfish-solutions.com>
> ---
> net/openssh/Makefile | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/net/openssh/Makefile b/net/openssh/Makefile
> index 3a19387b0d0110fc5c25d7ffccb524a61c0588c4..7ca61f6ce6d5916016a554b4a283a874e950232c 100644
> --- a/net/openssh/Makefile
> +++ b/net/openssh/Makefile
> @@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
> 
> PKG_NAME:=openssh
> PKG_VERSION:=7.6p1
> -PKG_RELEASE:=1
> +PKG_RELEASE:=2
> 
> PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
> PKG_SOURCE_URL:=https://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/ \
> @@ -248,7 +248,10 @@ define Package/openssh-server/install
> 	$(INSTALL_DIR) $(1)/etc/ssh
> 	chmod 0700 $(1)/etc/ssh
> 	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/etc/ssh/sshd_config $(1)/etc/ssh/
> -	sed -r -i 's,^#(HostKey /etc/ssh/ssh_host_(rsa|ecdsa|ed25519)_key)$$$$,\1,' $(1)/etc/ssh/sshd_config
> +	sed -r -i \
> +	    -e 's,^#(HostKey /etc/ssh/ssh_host_(rsa|ecdsa|ed25519)_key)$$$$,\1,' \
> +	    -e 's,^#PasswordAuthentication yes$$$$,PasswordAuthentication no,' \
> +		$(1)/etc/ssh/sshd_config
> 	$(INSTALL_DIR) $(1)/etc/init.d
> 	$(INSTALL_BIN) ./files/sshd.init $(1)/etc/init.d/sshd
> 	$(INSTALL_DIR) $(1)/usr/sbin
> -- 
> 2.7.4
> 
> 
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