Merge remote-tracking branch 'nicklewis/ticket/2.6.x/8770' into 2.6.x

* nicklewis/ticket/2.6.x/8770:
  (#8770) Always fully drop privileges when changing user
  (#8662) Migrate suidmanager test case to rspec

2 files changed, 56 insertions, 54 deletions

diff --git a/lib/puppet/util.rb b/lib/puppet/util.rb
index 34c6ec1ed..72c1f5f91 100644
--- a/lib/puppet/util.rb
+++ b/lib/puppet/util.rb
@@ -46,35 +46,24 @@ module Util
   # Change the process to a different user
   def self.chuser
     if group = Puppet[:group]
-      group = self.gid(group)
-      raise Puppet::Error, "No such group #{Puppet[:group]}" unless group
-      unless Puppet::Util::SUIDManager.gid == group
-        begin
-          Puppet::Util::SUIDManager.egid = group
-          Puppet::Util::SUIDManager.gid = group
-        rescue => detail
-          Puppet.warning "could not change to group #{group.inspect}: #{detail}"
-          $stderr.puts "could not change to group #{group.inspect}"
-
-          # Don't exit on failed group changes, since it's
-          # not fatal
-          #exit(74)
-        end
+      begin
+        Puppet::Util::SUIDManager.change_group(group, true)
+      rescue => detail
+        Puppet.warning "could not change to group #{group.inspect}: #{detail}"
+        $stderr.puts "could not change to group #{group.inspect}"
+
+        # Don't exit on failed group changes, since it's
+        # not fatal
+        #exit(74)
       end
     end
 
     if user = Puppet[:user]
-      user = self.uid(user)
-      raise Puppet::Error, "No such user #{Puppet[:user]}" unless user
-      unless Puppet::Util::SUIDManager.uid == user
-        begin
-          Puppet::Util::SUIDManager.initgroups(user)
-          Puppet::Util::SUIDManager.uid = user
-          Puppet::Util::SUIDManager.euid = user
-        rescue => detail
-          $stderr.puts "Could not change to user #{user}: #{detail}"
-          exit(74)
-        end
+      begin
+        Puppet::Util::SUIDManager.change_user(user, true)
+      rescue => detail
+        $stderr.puts "Could not change to user #{user}: #{detail}"
+        exit(74)
       end
     end
   end
@@ -89,18 +78,14 @@ module Util
         if useself
 
           Puppet::Util::Log.create(
-
             :level => level,
             :source => self,
-
             :message => args
           )
         else
 
           Puppet::Util::Log.create(
-
             :level => level,
-
             :message => args
           )
         end
@@ -261,9 +246,6 @@ module Util
       Puppet.debug "Executing '#{str}'"
     end
 
-    arguments[:uid] = Puppet::Util::SUIDManager.convert_xid(:uid, arguments[:uid]) if arguments[:uid]
-    arguments[:gid] = Puppet::Util::SUIDManager.convert_xid(:gid, arguments[:gid]) if arguments[:gid]
-
     if execution_stub = Puppet::Util::ExecutionStub.current_value
       return execution_stub.call(command, arguments)
     end
@@ -305,14 +287,8 @@ module Util
           $stderr.reopen(error_file)
 
           3.upto(256){|fd| IO::new(fd).close rescue nil}
-          if arguments[:gid]
-            Process.egid = arguments[:gid]
-            Process.gid = arguments[:gid] unless @@os == "Darwin"
-          end
-          if arguments[:uid]
-            Process.euid = arguments[:uid]
-            Process.uid = arguments[:uid] unless @@os == "Darwin"
-          end
+          Puppet::Util::SUIDManager.change_group(arguments[:gid], true) if arguments[:gid]
+          Puppet::Util::SUIDManager.change_user(arguments[:uid], true) if arguments[:uid]
           ENV['LANG'] = ENV['LC_ALL'] = ENV['LC_MESSAGES'] = ENV['LANGUAGE'] = 'C'
           if command.is_a?(Array)
             Kernel.exec(*command)
diff --git a/lib/puppet/util/suidmanager.rb b/lib/puppet/util/suidmanager.rb
index 6633de002..2e12b220f 100644
--- a/lib/puppet/util/suidmanager.rb
+++ b/lib/puppet/util/suidmanager.rb
@@ -36,12 +36,6 @@ module Puppet::Util::SUIDManager
   end
   module_function :groups=
 
-  if Facter['kernel'].value == 'Darwin'
-    # Cannot change real UID on Darwin so we set euid
-    alias :uid :euid
-    alias :gid :egid
-  end
-
   def self.root?
     Process.uid == 0
   end
@@ -50,23 +44,55 @@ module Puppet::Util::SUIDManager
   def asuser(new_uid=nil, new_gid=nil)
     return yield if Puppet.features.microsoft_windows? or !root?
 
-    # We set both because some programs like to drop privs, i.e. bash.
-    old_uid, old_gid = self.uid, self.gid
     old_euid, old_egid = self.euid, self.egid
-    old_groups = self.groups
     begin
-      self.egid = convert_xid :gid, new_gid if new_gid
-      self.initgroups(convert_xid(:uid, new_uid)) if new_uid
-      self.euid = convert_xid :uid, new_uid if new_uid
+      change_group(new_gid) if new_gid
+      change_user(new_uid) if new_uid
 
       yield
     ensure
-      self.euid, self.egid = old_euid, old_egid
-      self.groups = old_groups
+      change_group(old_egid)
+      change_user(old_euid)
     end
   end
   module_function :asuser
 
+  def change_group(group, permanently=false)
+    gid = convert_xid(:gid, group)
+    raise Puppet::Error, "No such group #{group}" unless gid
+
+    if permanently
+      begin
+        Process::GID.change_privilege(gid)
+      rescue NotImplementedError
+        Process.egid = gid
+        Process.gid  = gid
+      end
+    else
+      Process.egid = gid
+    end
+  end
+  module_function :change_group
+
+  def change_user(user, permanently=false)
+    uid = convert_xid(:uid, user)
+    raise Puppet::Error, "No such user #{user}" unless uid
+
+    if permanently
+      begin
+        Process::UID.change_privilege(uid)
+      rescue NotImplementedError
+        initgroups(uid)
+        Process.euid = uid
+        Process.uid  = uid
+      end
+    else
+      initgroups(uid)
+      Process.euid = uid
+    end
+  end
+  module_function :change_user
+
   # Make sure the passed argument is a number.
   def convert_xid(type, id)
     map = {:gid => :group, :uid => :user}