SSH_USER variable not working

[Pavo-IM]

[jdeathe]

@Pavo-IM This is expected; the value used for SSH_USER didn’t validate. Try without an uppercase character.

Ref:

centos-ssh/src/usr/sbin/sshd-bootstrap

Line 744 in 378c503

local -r safe_user='^[a-z_][a-z0-9_-]{0,29}[$a-z0-9_]?$'

[Pavo-IM]

@Pavo-IM This is expected; the value used for SSH_USER didn’t validate. Try without an uppercase character.

Ref:

centos-ssh/src/usr/sbin/sshd-bootstrap

Line 744 in 378c503

local -r safe_user='^[a-z_][a-z0-9_-]{0,29}[$a-z0-9_]?$'

Works, thanks but is there anyway to add upper and lower case username support?

[jdeathe]

@Pavo-IM This validation was based on the following standards based validation routine:

Ref: https://github.com/shadow-maint/shadow/blob/4.6/man/useradd.8.xml#L639-L661

However, looking into the source of the shadow rpm for CentOS 7 the user name validation is less restrictive by way of a patch to is_valid_name.

Ref: https://git.centos.org/rpms/shadow-utils/blob/c7/f/SOURCES/shadow-4.5-goodname.patch#_16-23

[a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,30}[a-zA-Z0-9_.$-]?