[Buildroot] [PATCH v2] Allow setting the password for user default

[Arnout Vandecappelle]

On 06/03/14 11:29, Stephan Hoffmann wrote:
> Signed-off-by: Stephan Hoffmann <sho at relinux.de>
> ---
> Since we can set the password for root while configuring the system
> it seems logical to have the same possibility for user "default".
> 
> Changes v1 -> v2
>   - remove rewording in help text for BR2_TARGET_GENERIC_ROOT_PASSWD
> ---
>  system/Config.in | 23 ++++++++++++++++++++++-
>  system/system.mk | 11 ++++++++++-
>  2 files changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/system/Config.in b/system/Config.in
> index 53bca53..d5408e1 100644
> --- a/system/Config.in
> +++ b/system/Config.in
> @@ -211,6 +211,27 @@ config BR2_TARGET_GENERIC_ROOT_PASSWD
>  	  in the build log! Avoid using a valuable password if either the
>  	  .config file or the build log may be distributed!
>  
> +config BR2_TARGET_GENERIC_DEFAULT_PASSWD
> +	string "Password for user default"
> +	default ""
> +	help
> +	  Set the initial password for user default (in clear). It will be encrypted.
> +
> +	  If set to empty (the default), then no password will be set,
> +	  and default will need no password to log in.
> +
> +	  WARNING! WARNING!
> +	  Although pretty strong, MD5 is now an old hash function, and
> +	  suffers from some weaknesses, which makes it susceptible to attacks.
> +	  It is showing its age, so this root password should not be trusted
> +	  to properly secure any product that can be shipped to the wide,
> +	  hostile world.

 Since we can now select the hash, this warning has no merit anymore.

 With that fixed:

Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>

> +
> +	  WARNING! WARNING!
> +	  The password appears in clear in the .config file, and may appear
> +	  in the build log! Avoid using a valuable password if either the
> +	  .config file or the build log may be distributed!
> +
>  config BR2_TARGET_GENERIC_GETTY
>  	bool "Run a getty (login prompt) after boot"
>  	default y
> diff --git a/system/system.mk b/system/system.mk
> index 01a6c3a..367a8c4 100644
> --- a/system/system.mk
> +++ b/system/system.mk
> @@ -1,6 +1,7 @@
>  TARGET_GENERIC_HOSTNAME = $(call qstrip,$(BR2_TARGET_GENERIC_HOSTNAME))
>  TARGET_GENERIC_ISSUE = $(call qstrip,$(BR2_TARGET_GENERIC_ISSUE))
>  TARGET_GENERIC_ROOT_PASSWD = $(call qstrip,$(BR2_TARGET_GENERIC_ROOT_PASSWD))
> +TARGET_GENERIC_DEFAULT_PASSWD:=$(call qstrip,$(BR2_TARGET_GENERIC_DEFAULT_PASSWD))
>  TARGET_GENERIC_PASSWD_METHOD = $(call qstrip,$(BR2_TARGET_GENERIC_PASSWD_METHOD))
>  TARGET_GENERIC_GETTY_PORT = $(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT))
>  TARGET_GENERIC_GETTY_BAUDRATE = $(call qstrip,$(BR2_TARGET_GENERIC_GETTY_BAUDRATE))
> @@ -29,6 +30,14 @@ target-root-passwd:
>  		TARGET_GENERIC_ROOT_PASSWD_HASH=$$($(MKPASSWD) -m "$(TARGET_GENERIC_PASSWD_METHOD)" "$(TARGET_GENERIC_ROOT_PASSWD)"); \
>  	$(SED) "s,^root:[^:]*:,root:$$TARGET_GENERIC_ROOT_PASSWD_HASH:," $(TARGET_DIR)/etc/shadow
>  
> +ifneq ($(TARGET_GENERIC_DEFAULT_PASSWD),)
> +target-default-passwd: host-mkpasswd
> +endif
> +target-default-passwd:
> +	[ -n "$(TARGET_GENERIC_DEFAULT_PASSWD)" ] && \
> +		TARGET_GENERIC_DEFAULT_PASSWD_HASH=$$($(MKPASSWD) -m "$(TARGET_GENERIC_PASSWD_METHOD)" "$(TARGET_GENERIC_DEFAULT_PASSWD)"); \
> +	$(SED) "s,^default:[^:]*:,default:$$TARGET_GENERIC_DEFAULT_PASSWD_HASH:," $(TARGET_DIR)/etc/shadow

 It would have been nice to factor this with the root password generation, but
that can be done in a follow-up patch if needed.


 Regards,
 Arnout

> +
>  target-generic-getty-busybox:
>  	$(SED) '/# GENERIC_SERIAL$$/s~^.*#~$(TARGET_GENERIC_GETTY_PORT)::respawn:/sbin/getty -L $(TARGET_GENERIC_GETTY_OPTIONS) $(TARGET_GENERIC_GETTY_PORT) $(TARGET_GENERIC_GETTY_BAUDRATE) $(TARGET_GENERIC_GETTY_TERM) #~' \
>  		$(TARGET_DIR)/etc/inittab
> @@ -60,7 +69,7 @@ TARGETS += target-generic-issue
>  endif
>  
>  ifeq ($(BR2_ROOTFS_SKELETON_DEFAULT),y)
> -TARGETS += target-root-passwd
> +TARGETS += target-root-passwd target-default-passwd
>  
>  ifeq ($(BR2_TARGET_GENERIC_GETTY),y)
>  TARGETS += target-generic-getty-$(if $(BR2_PACKAGE_SYSVINIT),sysvinit,busybox)
> 


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint:  7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F