Merge pull request #8570 from joshcooper/selinux_7559

(PUP-7559) Pass correct mode when lookup SELinux default context

Author: GabrielNagy

lib/puppet/type/file/selcontext.rb

@@ -42,7 +42,7 @@ def retrieve_default_context(property)
         return nil
       end
 
-      context = self.get_selinux_default_context(@resource[:path])
+      context = self.get_selinux_default_context(@resource[:path], @resource[:ensure])
       unless context
         return nil
       end

lib/puppet/util/selinux.rb

@@ -13,6 +13,10 @@
 
 module Puppet::Util::SELinux
 
+  S_IFREG = 0100000
+  S_IFDIR = 0040000
+  S_IFLNK = 0120000
+
   def self.selinux_support?
     return false unless defined?(Selinux)
     if Selinux.is_selinux_enabled == 1
@@ -38,7 +42,7 @@ def get_selinux_current_context(file)
 
   # Retrieve and return the default context of the file.  If we don't have
   # SELinux support or if the SELinux call fails to file a default then return nil.
-  def get_selinux_default_context(file)
+  def get_selinux_default_context(file, resource_ensure=nil)
     return nil unless selinux_support?
     # If the filesystem has no support for SELinux labels, return a default of nil
     # instead of what matchpathcon would return
@@ -48,8 +52,14 @@ def get_selinux_default_context(file)
     begin
       filestat = file_lstat(file)
       mode = filestat.mode
-    rescue Errno::EACCES, Errno::ENOENT
+    rescue Errno::EACCES
       mode = 0
+    rescue Errno::ENOENT
+      if resource_ensure
+        mode = get_create_mode(resource_ensure)
+      else
+        mode = 0
+      end
     end
 
     retval = Selinux.matchpathcon(file, mode)
@@ -136,8 +146,8 @@ def set_selinux_context(file, value, component = false)
   # Puppet uses.  This will set the file's SELinux context to the policy's
   # default context (if any) if it differs from the context currently on
   # the file.
-  def set_selinux_default_context(file)
-    new_context = get_selinux_default_context(file)
+  def set_selinux_default_context(file, resource_ensure=nil)
+    new_context = get_selinux_default_context(file, resource_ensure)
     return nil unless new_context
     cur_context = get_selinux_current_context(file)
     if new_context != cur_context
@@ -198,6 +208,22 @@ def selinux_label_support?(file)
     filesystems.include?(fstype)
   end
 
+  # Get mode file type bits set based on ensure on
+  # the file resource. This helps SELinux determine
+  # what context a new resource being created should have.
+  def get_create_mode(resource_ensure)
+    mode = 0
+    case resource_ensure
+    when :present, :file
+      mode |= S_IFREG
+    when :directory
+      mode |= S_IFDIR
+    when :link
+      mode |= S_IFLNK
+    end
+    mode
+  end
+
   # Internal helper function to read and parse /proc/mounts
   def read_mounts
     mounts = ""

spec/unit/type/file/selinux_spec.rb

@@ -7,7 +7,7 @@
 
     before do
       @path = make_absolute("/my/file")
-      @resource = Puppet::Type.type(:file).new :path => @path
+      @resource = Puppet::Type.type(:file).new(:path => @path, :ensure => :file)
       @sel = property.new :resource => @resource
     end
 
@@ -50,13 +50,13 @@
     end
 
     it "should handle no default gracefully" do
-      expect(@sel).to receive(:get_selinux_default_context).with(@path).and_return(nil)
+      expect(@sel).to receive(:get_selinux_default_context).with(@path, :file).and_return(nil)
       expect(@sel.default).to be_nil
     end
 
     it "should be able to detect matchpathcon defaults" do
       allow(@sel).to receive(:debug)
-      expect(@sel).to receive(:get_selinux_default_context).with(@path).and_return("user_u:role_r:type_t:s0")
+      expect(@sel).to receive(:get_selinux_default_context).with(@path, :file).and_return("user_u:role_r:type_t:s0")
       expectedresult = case param
         when :seluser; "user_u"
         when :selrole; "role_r"

spec/unit/util/selinux_spec.rb

@@ -159,7 +159,7 @@
       end
     end
 
-    it "handles no such file or directory errors by issuing a warning" do
+    it "backward compatibly handles no such file or directory errors by issuing a warning when resource_ensure not set" do
       without_partial_double_verification do
         allow(self).to receive(:selinux_support?).and_return(true)
         allow(self).to receive(:selinux_label_support?).and_return(true)
@@ -170,6 +170,51 @@
       end
     end
 
+    it "should determine mode based on resource ensure when set to file" do
+      without_partial_double_verification do
+        allow(self).to receive(:selinux_support?).and_return(true)
+        allow(self).to receive(:selinux_label_support?).and_return(true)
+        allow(Selinux).to receive(:matchpathcon).with("/root/chuj", 32768).and_return(-1)
+        allow(self).to receive(:file_lstat).with("/root/chuj").and_raise(Errno::ENOENT, "/root/chuj")
+
+        expect(get_selinux_default_context("/root/chuj", :present)).to be_nil
+        expect(get_selinux_default_context("/root/chuj", :file)).to be_nil
+      end
+    end
+
+    it "should determine mode based on resource ensure when set to dir" do
+      without_partial_double_verification do
+        allow(self).to receive(:selinux_support?).and_return(true)
+        allow(self).to receive(:selinux_label_support?).and_return(true)
+        allow(Selinux).to receive(:matchpathcon).with("/root/chuj", 16384).and_return(-1)
+        allow(self).to receive(:file_lstat).with("/root/chuj").and_raise(Errno::ENOENT, "/root/chuj")
+
+        expect(get_selinux_default_context("/root/chuj", :directory)).to be_nil
+      end
+    end
+
+    it "should determine mode based on resource ensure when set to link" do
+      without_partial_double_verification do
+        allow(self).to receive(:selinux_support?).and_return(true)
+        allow(self).to receive(:selinux_label_support?).and_return(true)
+        allow(Selinux).to receive(:matchpathcon).with("/root/chuj", 40960).and_return(-1)
+        allow(self).to receive(:file_lstat).with("/root/chuj").and_raise(Errno::ENOENT, "/root/chuj")
+
+        expect(get_selinux_default_context("/root/chuj", :link)).to be_nil
+      end
+    end
+
+    it "should determine mode based on resource ensure when set to unknown" do
+      without_partial_double_verification do
+        allow(self).to receive(:selinux_support?).and_return(true)
+        allow(self).to receive(:selinux_label_support?).and_return(true)
+        allow(Selinux).to receive(:matchpathcon).with("/root/chuj", 0).and_return(-1)
+        allow(self).to receive(:file_lstat).with("/root/chuj").and_raise(Errno::ENOENT, "/root/chuj")
+
+        expect(get_selinux_default_context("/root/chuj", "unknown")).to be_nil
+      end
+    end
+
     it "should return nil if matchpathcon returns failure" do
       without_partial_double_verification do
         expect(self).to receive(:selinux_support?).and_return(true)
@@ -329,21 +374,44 @@
     end
 
     it "should return nil if no default context exists" do
-      expect(self).to receive(:get_selinux_default_context).with("/foo").and_return(nil)
+      expect(self).to receive(:get_selinux_default_context).with("/foo", nil).and_return(nil)
       expect(set_selinux_default_context("/foo")).to be_nil
     end
 
     it "should do nothing and return nil if the current context matches the default context" do
-      expect(self).to receive(:get_selinux_default_context).with("/foo").and_return("user_u:role_r:type_t")
+      expect(self).to receive(:get_selinux_default_context).with("/foo", nil).and_return("user_u:role_r:type_t")
       expect(self).to receive(:get_selinux_current_context).with("/foo").and_return("user_u:role_r:type_t")
       expect(set_selinux_default_context("/foo")).to be_nil
     end
 
     it "should set and return the default context if current and default do not match" do
-      expect(self).to receive(:get_selinux_default_context).with("/foo").and_return("user_u:role_r:type_t")
+      expect(self).to receive(:get_selinux_default_context).with("/foo", nil).and_return("user_u:role_r:type_t")
       expect(self).to receive(:get_selinux_current_context).with("/foo").and_return("olduser_u:role_r:type_t")
       expect(self).to receive(:set_selinux_context).with("/foo", "user_u:role_r:type_t").and_return(true)
       expect(set_selinux_default_context("/foo")).to eq("user_u:role_r:type_t")
     end
   end
+
+  describe "get_create_mode" do
+    it "should return 0 if the resource is absent" do
+      expect(get_create_mode(:absent)).to eq(0)
+    end
+
+    it "should return mode with file type set to S_IFREG when resource is file" do
+      expect(get_create_mode(:present)).to eq(32768)
+      expect(get_create_mode(:file)).to eq(32768)
+    end
+
+    it "should return mode with file type set to S_IFDIR when resource is dir" do
+      expect(get_create_mode(:directory)).to eq(16384)
+    end
+
+    it "should return mode with file type set to S_IFLNK when resource is link" do
+      expect(get_create_mode(:link)).to eq(40960)
+    end
+
+    it "should return 0 for everything else" do
+      expect(get_create_mode("unknown")).to eq(0)
+    end
+  end
 end