89 lines
3.1 KiB
Ruby
89 lines
3.1 KiB
Ruby
# frozen_string_literal: true
|
|
module Security
|
|
module WeakPasswords
|
|
# These words are predictable in GitLab's specific context, and
|
|
# therefore cannot occur anywhere within a password.
|
|
FORBIDDEN_WORDS = Set['gitlab', 'devops'].freeze
|
|
|
|
# Substrings shorter than this may appear legitimately in a truly
|
|
# random password.
|
|
MINIMUM_SUBSTRING_SIZE = 4
|
|
|
|
class << self
|
|
# Returns true when the password is on a list of weak passwords,
|
|
# or contains predictable substrings derived from user attributes.
|
|
# Case insensitive.
|
|
def weak_for_user?(password, user)
|
|
forbidden_word_appears_in_password?(password) ||
|
|
name_appears_in_password?(password, user) ||
|
|
username_appears_in_password?(password, user) ||
|
|
email_appears_in_password?(password, user) ||
|
|
password_on_weak_list?(password)
|
|
end
|
|
|
|
private
|
|
|
|
def forbidden_word_appears_in_password?(password)
|
|
contains_predicatable_substring?(password, FORBIDDEN_WORDS)
|
|
end
|
|
|
|
def name_appears_in_password?(password, user)
|
|
return false if user.name.blank?
|
|
|
|
# Check for the full name
|
|
substrings = [user.name]
|
|
# Also check parts of their name
|
|
substrings += user.name.split(/[^\p{Alnum}]/)
|
|
|
|
contains_predicatable_substring?(password, substrings)
|
|
end
|
|
|
|
def username_appears_in_password?(password, user)
|
|
return false if user.username.blank?
|
|
|
|
# Check for the full username
|
|
substrings = [user.username]
|
|
# Also check sub-strings in the username
|
|
substrings += user.username.split(/[^\p{Alnum}]/)
|
|
|
|
contains_predicatable_substring?(password, substrings)
|
|
end
|
|
|
|
def email_appears_in_password?(password, user)
|
|
return false if user.email.blank?
|
|
|
|
# Check for the full email
|
|
substrings = [user.email]
|
|
# Also check full first part and full domain name
|
|
substrings += user.email.split("@")
|
|
# And any parts of non-word characters (e.g. firstname.lastname+tag@...)
|
|
substrings += user.email.split(/[^\p{Alnum}]/)
|
|
|
|
contains_predicatable_substring?(password, substrings)
|
|
end
|
|
|
|
def password_on_weak_list?(password)
|
|
# Our weak list stores SHA2 hashes of passwords, not the weak
|
|
# passwords themselves.
|
|
digest = Digest::SHA256.base64digest(password.downcase)
|
|
Settings.gitlab.weak_passwords_digest_set.include?(digest)
|
|
end
|
|
|
|
# Case-insensitively checks whether a password includes a dynamic
|
|
# list of substrings. Substrings which are too short are not
|
|
# predictable and may occur randomly, and therefore not checked.
|
|
def contains_predicatable_substring?(password, substrings)
|
|
substrings = substrings.filter_map do |substring|
|
|
substring.downcase if substring.length >= MINIMUM_SUBSTRING_SIZE
|
|
end
|
|
|
|
password = password.downcase
|
|
|
|
# Returns true when a predictable substring occurs anywhere
|
|
# in the password.
|
|
substrings.any? { |word| password.include?(word) }
|
|
end
|
|
end
|
|
end
|
|
end
|