merge revision(s) 62422: [Backport #14481]

	Merge RubyGems 2.7.6 from upstream.

	  It fixed some security vulnerabilities.

	  http://blog.rubygems.org/2018/02/15/2.7.6-released.html

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62434 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

6 files changed, 74 insertions, 19 deletions

diff --git a/lib/rubygems/commands/owner_command.rb b/lib/rubygems/commands/owner_command.rb
index 4b99434e87..2ee7f84462 100644
--- a/lib/rubygems/commands/owner_command.rb
+++ b/lib/rubygems/commands/owner_command.rb
@@ -62,7 +62,7 @@ permission to.
     end
 
     with_response response do |resp|
-      owners = YAML.load resp.body
+      owners = Gem::SafeYAML.load resp.body
 
       say "Owners for gem: #{name}"
       owners.each do |owner|
diff --git a/lib/rubygems/package.rb b/lib/rubygems/package.rb
index 77811ed5ec..b5a5fe2a26 100644
--- a/lib/rubygems/package.rb
+++ b/lib/rubygems/package.rb
@@ -378,7 +378,7 @@ EOM
             File.dirname destination
           end
 
-        FileUtils.mkdir_p mkdir, mkdir_options
+        mkdir_p_safe mkdir, mkdir_options, destination_dir, entry.full_name
 
         open destination, 'wb' do |out|
           out.write entry.read
@@ -416,20 +416,35 @@ EOM
     raise Gem::Package::PathError.new(filename, destination_dir) if
       filename.start_with? '/'
 
-    destination_dir = File.realpath destination_dir if
-      File.respond_to? :realpath
+    destination_dir = realpath destination_dir
     destination_dir = File.expand_path destination_dir
 
     destination = File.join destination_dir, filename
     destination = File.expand_path destination
 
     raise Gem::Package::PathError.new(destination, destination_dir) unless
-      destination.start_with? destination_dir
+      destination.start_with? destination_dir + '/'
 
     destination.untaint
     destination
   end
 
+  def mkdir_p_safe mkdir, mkdir_options, destination_dir, file_name
+    destination_dir = realpath File.expand_path(destination_dir)
+    parts = mkdir.split(File::SEPARATOR)
+    parts.reduce do |path, basename|
+      path = realpath path  unless path == ""
+      path = File.expand_path(path + File::SEPARATOR + basename)
+      lstat = File.lstat path rescue nil
+      if !lstat || !lstat.directory?
+        unless path.start_with? destination_dir and (FileUtils.mkdir path, mkdir_options rescue false)
+          raise Gem::Package::PathError.new(file_name, destination_dir)
+        end
+      end
+      path
+    end
+  end
+
   ##
   # Loads a Gem::Specification from the TarEntry +entry+
 
@@ -603,6 +618,10 @@ EOM
       raise Gem::Package::FormatError.new \
               'package content (data.tar.gz) is missing', @gem
     end
+
+    if duplicates = @files.group_by {|f| f }.select {|k,v| v.size > 1 }.map(&:first) and duplicates.any?
+      raise Gem::Security::Exception, "duplicate files in the package: (#{duplicates.map(&:inspect).join(', ')})"
+    end
   end
 
   ##
@@ -616,6 +635,16 @@ EOM
     raise Gem::Package::FormatError.new(e.message, entry.full_name)
   end
 
+  if File.respond_to? :realpath
+    def realpath file
+      File.realpath file
+    end
+  else
+    def realpath file
+      file
+    end
+  end
+
 end
 
 require 'rubygems/package/digest_io'
diff --git a/lib/rubygems/package/tar_header.rb b/lib/rubygems/package/tar_header.rb
index c54bd14d57..d557357114 100644
--- a/lib/rubygems/package/tar_header.rb
+++ b/lib/rubygems/package/tar_header.rb
@@ -104,25 +104,30 @@ class Gem::Package::TarHeader
     fields = header.unpack UNPACK_FORMAT
 
     new :name     => fields.shift,
-        :mode     => fields.shift.oct,
-        :uid      => fields.shift.oct,
-        :gid      => fields.shift.oct,
-        :size     => fields.shift.oct,
-        :mtime    => fields.shift.oct,
-        :checksum => fields.shift.oct,
+        :mode     => strict_oct(fields.shift),
+        :uid      => strict_oct(fields.shift),
+        :gid      => strict_oct(fields.shift),
+        :size     => strict_oct(fields.shift),
+        :mtime    => strict_oct(fields.shift),
+        :checksum => strict_oct(fields.shift),
         :typeflag => fields.shift,
         :linkname => fields.shift,
         :magic    => fields.shift,
-        :version  => fields.shift.oct,
+        :version  => strict_oct(fields.shift),
         :uname    => fields.shift,
         :gname    => fields.shift,
-        :devmajor => fields.shift.oct,
-        :devminor => fields.shift.oct,
+        :devmajor => strict_oct(fields.shift),
+        :devminor => strict_oct(fields.shift),
         :prefix   => fields.shift,
 
         :empty => empty
   end
 
+  def self.strict_oct(str)
+    return str.oct if str =~ /\A[0-7]*\z/
+    raise ArgumentError, "#{str.inspect} is not an octal string"
+  end
+
   ##
   # Creates a new TarHeader using +vals+
 
diff --git a/lib/rubygems/package/tar_writer.rb b/lib/rubygems/package/tar_writer.rb
index f68b8d4c5e..390f7851a3 100644
--- a/lib/rubygems/package/tar_writer.rb
+++ b/lib/rubygems/package/tar_writer.rb
@@ -196,6 +196,8 @@ class Gem::Package::TarWriter
       digest_name == signer.digest_name
     end
 
+    raise "no #{signer.digest_name} in #{digests.values.compact}" unless signature_digest
+
     if signer.key then
       signature = signer.sign signature_digest.digest
 
diff --git a/lib/rubygems/server.rb b/lib/rubygems/server.rb
index df4eb566d3..a7b5243ba0 100644
--- a/lib/rubygems/server.rb
+++ b/lib/rubygems/server.rb
@@ -631,6 +631,18 @@ div.method-source-code pre { color: #ffdead; overflow: hidden; }
       executables = nil if executables.empty?
       executables.last["is_last"] = true if executables
 
+      # Pre-process spec homepage for safety reasons
+      begin
+        homepage_uri = URI.parse(spec.homepage)
+        if [URI::HTTP, URI::HTTPS].member? homepage_uri.class
+          homepage_uri = spec.homepage
+        else
+          homepage_uri = "."
+        end
+      rescue URI::InvalidURIError
+        homepage_uri = "."
+      end
+
       specs << {
         "authors"             => spec.authors.sort.join(", "),
         "date"                => spec.date.to_s,
@@ -640,7 +652,7 @@ div.method-source-code pre { color: #ffdead; overflow: hidden; }
         "only_one_executable" => (executables && executables.size == 1),
         "full_name"           => spec.full_name,
         "has_deps"            => !deps.empty?,
-        "homepage"            => spec.homepage,
+        "homepage"            => homepage_uri,
         "name"                => spec.name,
         "rdoc_installed"      => Gem::RDoc.new(spec).rdoc_installed?,
         "ri_installed"        => Gem::RDoc.new(spec).ri_installed?,
diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 40e3a70d47..0a154b9001 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -15,6 +15,7 @@ require 'rubygems/basic_specification'
 require 'rubygems/stub_specification'
 require 'rubygems/util/list'
 require 'stringio'
+require 'uri'
 
 ##
 # The Specification class contains the information for a Gem.  Typically
@@ -2813,10 +2814,16 @@ http://spdx.org/licenses or '#{Gem::Licenses::NONSTANDARD}' for a nonstandard li
       raise Gem::InvalidSpecificationException, "#{lazy} is not a summary"
     end
 
-    if homepage and not homepage.empty? and
-       homepage !~ /\A[a-z][a-z\d+.-]*:/i then
-      raise Gem::InvalidSpecificationException,
-            "\"#{homepage}\" is not a URI"
+    # Make sure a homepage is valid HTTP/HTTPS URI
+    if homepage and not homepage.empty?
+      begin
+        homepage_uri = URI.parse(homepage)
+        unless [URI::HTTP, URI::HTTPS].member? homepage_uri.class
+          raise Gem::InvalidSpecificationException, "\"#{homepage}\" is not a valid HTTP URI"
+        end
+      rescue URI::InvalidURIError
+        raise Gem::InvalidSpecificationException, "\"#{homepage}\" is not a valid HTTP URI"
+      end
     end
 
     # Warnings