Escape username and password in UrlSanitizer#full_url

If a user uses a password with certain characters (e.g. /, #, +, etc.)
UrlSanitizer#full_url will generate an invalid URL that cannot be
parsed properly by Addressable::URI. If used with UrlBlocker, this
will be flagged as an invalid URI.

changelogs/unreleased/sh-normalize-urls.yml

+---
+title: Escape username and password in UrlSanitizer#full_url
+merge_request: 20684
+author:
+type: fixed

lib/gitlab/url_sanitizer.rb

@@ -71,12 +71,10 @@ module Gitlab
     def generate_full_url
       return @url unless valid_credentials?
 
-      @full_url = @url.dup
-
-      @full_url.password = credentials[:password] if credentials[:password].present?
-      @full_url.user = credentials[:user] if credentials[:user].present?
-
-      @full_url
+      @url.dup.tap do |generated|
+        generated.password = encode_percent(credentials[:password]) if credentials[:password].present?
+        generated.user = encode_percent(credentials[:user]) if credentials[:user].present?
+      end
     end
 
     def safe_url
@@ -89,5 +87,10 @@ module Gitlab
     def valid_credentials?
       credentials && credentials.is_a?(Hash) && credentials.any?
     end
+
+    def encode_percent(string)
+      # CGI.escape converts spaces to +, but this doesn't work for git clone
+      CGI.escape(string).gsub('+', '%20')
+    end
   end
 end

spec/lib/gitlab/url_sanitizer_spec.rb

@@ -145,6 +145,10 @@ describe Gitlab::UrlSanitizer do
         'http://foo:@example.com'    | 'http://foo@example.com'
         'http://:bar@example.com'    | :same
         'http://foo:bar@example.com' | :same
+        'http://foo:g p@example.com' | 'http://foo:g%20p@example.com'
+        'http://foo:s/h@example.com' | 'http://foo:s%2Fh@example.com'
+        'http://t u:a#b@example.com' | 'http://t%20u:a%23b@example.com'
+        'http://t+u:a#b@example.com' | 'http://t%2Bu:a%23b@example.com'
       end
 
       with_them do
@@ -160,7 +164,7 @@ describe Gitlab::UrlSanitizer do
       url_sanitizer = described_class.new("https://foo:b?r@github.com/me/project.git")
 
       expect(url_sanitizer.sanitized_url).to eq("https://github.com/me/project.git")
-      expect(url_sanitizer.full_url).to eq("https://foo:b?r@github.com/me/project.git")
+      expect(url_sanitizer.full_url).to eq("https://foo:b%3Fr@github.com/me/project.git")
     end
   end
 end