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Commit e610332e authored by Michael Kozono's avatar Michael Kozono
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Normalize existing persisted DNs

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db/post_migrate/20170921101004_normalize_ldap_extern_uids.rb 0 → 100644
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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class NormalizeLdapExternUids < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
class Identity < ActiveRecord::Base
self.table_name = 'identities'
end
# Copied this class to make this migration resilient to future code changes.
# And if the normalize behavior is changed in the future, it must be
# accompanied by another migration.
module Gitlab
module LDAP
MalformedDnError = Class.new(StandardError)
UnsupportedDnFormatError = Class.new(StandardError)
class DN
##
# Initialize a DN, escaping as required. Pass in attributes in name/value
# pairs. If there is a left over argument, it will be appended to the dn
# without escaping (useful for a base string).
#
# Most uses of this class will be to escape a DN, rather than to parse it,
# so storing the dn as an escaped String and parsing parts as required
# with a state machine seems sensible.
def initialize(*args)
buffer = StringIO.new
args.each_index do |index|
buffer << "=" if index.odd?
buffer << "," if index.even? && index != 0
arg = args[index].downcase
buffer << if index < args.length - 1 || index.odd?
self.class.escape(arg)
else
arg
end
end
@dn = buffer.string
end
##
# Parse a DN into key value pairs using ASN from
# http://tools.ietf.org/html/rfc2253 section 3.
# rubocop:disable Metrics/AbcSize
# rubocop:disable Metrics/CyclomaticComplexity
# rubocop:disable Metrics/PerceivedComplexity
def each_pair
state = :key
key = StringIO.new
value = StringIO.new
hex_buffer = ""
@dn.each_char do |char|
case state
when :key then
case char
when 'a'..'z' then
state = :key_normal
key << char
when '0'..'9' then
state = :key_oid
key << char
when ' ' then state = :key
else raise(MalformedDnError, "Unrecognized first character of an RDN attribute type name \"#{char}\"")
end
when :key_normal then
case char
when '=' then state = :value
when 'a'..'z', '0'..'9', '-', ' ' then key << char
else raise(MalformedDnError, "Unrecognized RDN attribute type name character \"#{char}\"")
end
when :key_oid then
case char
when '=' then state = :value
when '0'..'9', '.', ' ' then key << char
else raise(MalformedDnError, "Unrecognized RDN OID attribute type name character \"#{char}\"")
end
when :value then
case char
when '\\' then state = :value_normal_escape
when '"' then state = :value_quoted
when ' ' then state = :value
when '#' then
state = :value_hexstring
value << char
when ',' then
state = :key
yield key.string.strip, value.string.rstrip
key = StringIO.new
value = StringIO.new
else
state = :value_normal
value << char
end
when :value_normal then
case char
when '\\' then state = :value_normal_escape
when ',' then
state = :key
yield key.string.strip, value.string.rstrip
key = StringIO.new
value = StringIO.new
when '+' then raise(UnsupportedDnFormatError, "Multivalued RDNs are not supported")
else value << char
end
when :value_normal_escape then
case char
when '0'..'9', 'a'..'f' then
state = :value_normal_escape_hex
hex_buffer = char
when /\s/ then
state = :value_normal_escape_whitespace
value << char
else
state = :value_normal
value << char
end
when :value_normal_escape_hex then
case char
when '0'..'9', 'a'..'f' then
state = :value_normal
value << "#{hex_buffer}#{char}".to_i(16).chr
else raise(MalformedDnError, "Invalid escaped hex code \"\\#{hex_buffer}#{char}\"")
end
when :value_normal_escape_whitespace then
case char
when '\\' then state = :value_normal_escape
when ',' then
state = :key
yield key.string.strip, value.string # Don't strip trailing escaped space!
key = StringIO.new
value = StringIO.new
when '+' then raise(UnsupportedDnFormatError, "Multivalued RDNs are not supported")
else value << char
end
when :value_quoted then
case char
when '\\' then state = :value_quoted_escape
when '"' then state = :value_end
else value << char
end
when :value_quoted_escape then
case char
when '0'..'9', 'a'..'f' then
state = :value_quoted_escape_hex
hex_buffer = char
else
state = :value_quoted
value << char
end
when :value_quoted_escape_hex then
case char
when '0'..'9', 'a'..'f' then
state = :value_quoted
value << "#{hex_buffer}#{char}".to_i(16).chr
else raise(MalformedDnError, "Expected the second character of a hex pair inside a double quoted value, but got \"#{char}\"")
end
when :value_hexstring then
case char
when '0'..'9', 'a'..'f' then
state = :value_hexstring_hex
value << char
when ' ' then state = :value_end
when ',' then
state = :key
yield key.string.strip, value.string.rstrip
key = StringIO.new
value = StringIO.new
else raise(MalformedDnError, "Expected the first character of a hex pair, but got \"#{char}\"")
end
when :value_hexstring_hex then
case char
when '0'..'9', 'a'..'f' then
state = :value_hexstring
value << char
else raise(MalformedDnError, "Expected the second character of a hex pair, but got \"#{char}\"")
end
when :value_end then
case char
when ' ' then state = :value_end
when ',' then
state = :key
yield key.string.strip, value.string.rstrip
key = StringIO.new
value = StringIO.new
else raise(MalformedDnError, "Expected the end of an attribute value, but got \"#{char}\"")
end
else raise "Fell out of state machine"
end
end
# Last pair
raise(MalformedDnError, 'DN string ended unexpectedly') unless
[:value, :value_normal, :value_hexstring, :value_end].include? state
yield key.string.strip, value.string.rstrip
end
##
# Returns the DN as an array in the form expected by the constructor.
def to_a
a = []
self.each_pair { |key, value| a << key << value } unless @dn.empty?
a
end
##
# Return the DN as an escaped string.
def to_s
@dn
end
##
# Return the DN as an escaped and normalized string.
def to_s_normalized
self.class.new(*to_a).to_s
end
# https://tools.ietf.org/html/rfc4514 section 2.4 lists these exceptions
# for DN values. All of the following must be escaped in any normal string
# using a single backslash ('\') as escape. The space character is left
# out here because in a "normalized" string, spaces should only be escaped
# if necessary (i.e. leading or trailing space).
NORMAL_ESCAPES = [',', '+', '"', '\\', '<', '>', ';', '='].freeze
# The following must be represented as escaped hex
HEX_ESCAPES = {
"\n" => '\0a',
"\r" => '\0d'
}.freeze
# Compiled character class regexp using the keys from the above hash, and
# checking for a space or # at the start, or space at the end, of the
# string.
ESCAPE_RE = Regexp.new("(^ |^#| $|[" +
NORMAL_ESCAPES.map { |e| Regexp.escape(e) }.join +
"])")
HEX_ESCAPE_RE = Regexp.new("([" +
HEX_ESCAPES.keys.map { |e| Regexp.escape(e) }.join +
"])")
##
# Escape a string for use in a DN value
def self.escape(string)
escaped = string.gsub(ESCAPE_RE) { |char| "\\" + char }
escaped.gsub(HEX_ESCAPE_RE) { |char| HEX_ESCAPES[char] }
end
##
# Proxy all other requests to the string object, because a DN is mainly
# used within the library as a string
# rubocop:disable GitlabSecurity/PublicSend
def method_missing(method, *args, &block)
@dn.send(method, *args, &block)
end
end
end
end
def up
ldap_identities = Identity.where("provider like 'ldap%'")
ldap_identities.find_each do |identity|
begin
identity.extern_uid = Gitlab::LDAP::DN.new(identity.extern_uid).to_s_normalized
unless identity.save
say "Unable to normalize \"#{identity.extern_uid}\". Skipping."
end
rescue Gitlab::LDAP::MalformedDnError, Gitlab::LDAP::UnsupportedDnFormatError => e
say "Unable to normalize \"#{identity.extern_uid}\" due to \"#{e.message}\". Skipping."
end
end
end
def down
end
end
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