Repository: shapesecurity/salvation (java)

Issue:
Policy intersection and union should be case insensitive.
intersect:
```java
Policy p = parse("default-src 'self' example.com; ");
Policy q = parse("default-src 'self' EXAMPLE.COM; ");
p.intersect(q);
```
will result following policy ` default-src 'self'` instead of `default-src 'self' example.com;` or `default-src 'self' EXAMPLE.COM;`

in case of union:
```java
Policy p = parse("default-src 'self' example.com; ");
Policy q = parse("default-src 'self' EXAMPLE.COM; ");
p.union(q);
```
result is the `default-src 'self' example.com EXAMPLE.COM` but it should be `default-src 'self' example.com;` or `default-src 'self' EXAMPLE.COM;`

I'm not sure about lowercase vs UPPERCASE or even vs CaMeLcAsE in result of intersect or union, but I would just leave it in lowercase.

Pull request description:
fixes #120
case insensitive comparison of scheme and host when merging

Patch:
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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diff --git a/src/main/java/com/shapesecurity/salvation/Parser.java b/src/main/java/com/shapesecurity/salvation/Parser.java
index 76c56f0..529c73d 100644
--- a/src/main/java/com/shapesecurity/salvation/Parser.java
+++ b/src/main/java/com/shapesecurity/salvation/Parser.java
@@ -145,7 +145,13 @@ public class Parser {
             if (this.eat(DirectiveSeparatorToken.class))
                 continue;
             try {
-                policy.addDirective(this.parseDirective());
+                Directive<? extends DirectiveValue> directive = this.parseDirective();
+                // only add a directive if it doesn't exist; used for handling duplicate directives in CSP headers
+                if (policy.getDirectiveByType(directive.getClass()) == null) {
+                    policy.addDirective(directive);
+                } else {
+                    this.warn(this.tokens[this.index - 2], "Policy contains more than one " + directive.name + " directive. All but the first instance will be ignored.");
+                }
             } catch (DirectiveParseException ignored) {
             }
         }
diff --git a/src/main/java/com/shapesecurity/salvation/directiveValues/HostSource.java b/src/main/java/com/shapesecurity/salvation/directiveValues/HostSource.java
index cd449e6..c30d18e 100644
--- a/src/main/java/com/shapesecurity/salvation/directiveValues/HostSource.java
+++ b/src/main/java/com/shapesecurity/salvation/directiveValues/HostSource.java
@@ -32,17 +32,23 @@ public class HostSource implements SourceExpression, AncestorSource, MatchesSour
         HostSource otherPrime = (HostSource) other;
         if (this.isWildcard() && otherPrime.isWildcard())
             return true;
-        return Objects.equals(this.scheme, otherPrime.scheme) &&
-            Objects.equals(this.host, otherPrime.host) &&
+
+        // safe to do uniform comparison of scheme and host
+        return Objects.equals(this.scheme != null ? this.scheme.toLowerCase() : null ,
+                otherPrime.scheme != null ? otherPrime.scheme.toLowerCase() : null) &&
+            Objects.equals(this.host != null ? this.host.toLowerCase() : null,
+                otherPrime.host != null ? otherPrime.host.toLowerCase() : null) &&
             this.port == otherPrime.port &&
             Objects.equals(this.path, otherPrime.path);
     }
 
     @Override public int hashCode() {
+
+        // scheme and host matching is case-insensitive
         int h = 0;
         if (this.scheme != null)
-            h ^= this.scheme.hashCode() ^ 0xA303EFA3;
-        h ^= this.host.hashCode() ^ 0xFB2290B2;
+            h ^= this.scheme.toLowerCase().hashCode() ^ 0xA303EFA3;
+        h ^= this.host.toLowerCase().hashCode() ^ 0xFB2290B2;
         h ^= this.port ^ 0xB54E99F3;
         if (this.path != null)
             h ^= this.path.hashCode() ^ 0x13324C0E;
@@ -70,7 +76,7 @@ public class HostSource implements SourceExpression, AncestorSource, MatchesSour
             schemeMatches = this.scheme.equalsIgnoreCase(source.scheme);
         }
         boolean hostMatches = this.host.equals("*") || (this.host.startsWith("*.") ?
-            source.host.endsWith(this.host.substring(1)) :
+            source.host.toLowerCase().endsWith(this.host.substring(1).toLowerCase()) :
             this.host.equalsIgnoreCase(source.host));
         boolean uriUsesDefaultPort = source.port == Constants.EMPTY_PORT
             || SchemeHostPortTriple.defaultPortForProtocol(source.scheme) == source.port;
@@ -80,8 +86,8 @@ public class HostSource implements SourceExpression, AncestorSource, MatchesSour
             uriUsesDefaultPort :
             (source.port == Constants.EMPTY_PORT ? thisUsesDefaultPort : this.port == source.port));
         boolean pathMatches = this.path == null || (this.path.endsWith("/") ?
-            source.path.toLowerCase().startsWith(this.path.toLowerCase()) :
-            this.path.equalsIgnoreCase(source.path));
+            source.path.startsWith(this.path) :
+            this.path.equals(source.path));
         return schemeMatches && hostMatches && portMatches && pathMatches;
     }
 
diff --git a/src/main/java/com/shapesecurity/salvation/directives/Directive.java b/src/main/java/com/shapesecurity/salvation/directives/Directive.java
index 9cdfdb5..09d2225 100644
--- a/src/main/java/com/shapesecurity/salvation/directives/Directive.java
+++ b/src/main/java/com/shapesecurity/salvation/directives/Directive.java
@@ -15,7 +15,7 @@ import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 public abstract class Directive<Value extends DirectiveValue> implements Show {
-    @Nonnull private final String name;
+    @Nonnull public final String name;
 
     @Nonnull private Set<Value> values;
 


Test patch:
diff --git a/src/test/java/com/shapesecurity/salvation/ParserTest.java b/src/test/java/com/shapesecurity/salvation/ParserTest.java
index 11b05c0..b0f9c09 100644
--- a/src/test/java/com/shapesecurity/salvation/ParserTest.java
+++ b/src/test/java/com/shapesecurity/salvation/ParserTest.java
@@ -38,11 +38,20 @@ public class ParserTest extends CSPTest {
         ImgSrcDirective imgSrcDirective = p.getDirectiveByType(ImgSrcDirective.class);
         assertNotNull(imgSrcDirective);
         assertTrue(firstDirective instanceof ImgSrcDirective);
-        assertEquals("", imgSrcDirective, (ImgSrcDirective) firstDirective);
+        assertEquals("", imgSrcDirective, firstDirective);
         assertEquals("", "img-src", ImgSrcDirective.name);
         assertEquals("", "img-src a", imgSrcDirective.show());
     }
 
+    @Test public void testDuplicatesWithLocation() {
+        Policy p;
+        ArrayList<Notice> notices = new ArrayList<>();
+        p = ParserWithLocation.parse("img-src a ;;; img-src b", "https://example.com", notices);
+        assertEquals(1, notices.size());
+        assertEquals("1:15: Policy contains more than one img-src directive. All but the first instance will be ignored.", notices.get(0).show());
+
+    }
+
     @Test public void testDirectiveNameParsing() {
         ArrayList<Notice> notices = new ArrayList<>();
         Policy p;
diff --git a/src/test/java/com/shapesecurity/salvation/PolicyMergeTest.java b/src/test/java/com/shapesecurity/salvation/PolicyMergeTest.java
index dce2af6..2920cba 100644
--- a/src/test/java/com/shapesecurity/salvation/PolicyMergeTest.java
+++ b/src/test/java/com/shapesecurity/salvation/PolicyMergeTest.java
@@ -366,4 +366,73 @@ public class PolicyMergeTest extends CSPTest {
             p.show());
     }
 
+    @Test public void testIntersectionIsCaseInsensitive(){
+        Policy p = parse("default-src 'self' example.org; ");
+        Policy q = parse("default-src 'self' EXAMPLE.ORG; ");
+        p.intersect(q);
+        assertEquals("default-src 'self' example.org", p.show());
+
+        p = parse("default-src 'self' EXAMPLE.ORG; ");
+        q = parse("default-src 'self' example.org; ");
+        p.intersect(q);
+        assertEquals("default-src 'self' EXAMPLE.ORG", p.show());
+
+        p = parse("default-src 'self' *.abc; ");
+        q = parse("default-src 'self' *.aBc; ");
+        p.intersect(q);
+        assertEquals("default-src 'self' *.abc", p.show());
+
+        p = parse("default-src 'self' *.abc/a/b/c/; ");
+        q = parse("default-src 'self' *.ABc/a/B/c/; ");
+        p.union(q);
+        assertEquals("default-src 'self' *.abc/a/b/c/ *.ABc/a/B/c/", p.show());
+
+        p = parse("default-src 'self' *.abc/a; ");
+        q = parse("default-src 'self' *.ABc/A; ");
+        p.intersect(q);
+        assertEquals("default-src 'self'", p.show());
+
+        p = parse("default-src 'self' http://abc/a; ");
+        q = parse("default-src 'self' hTtP://ABc/a; ");
+        p.intersect(q);
+        assertEquals("default-src 'self' http://abc/a", p.show());
+    }
+
+    @Test public void testUnionCaseIsInsensitive(){
+        Policy p = parse("default-src 'self' example.org; ");
+        Policy q = parse("default-src 'self' EXAMPLE.ORG; ");
+        p.union(q);
+        assertEquals("default-src 'self' example.org", p.show());
+
+        p = parse("default-src 'self' EXAMPLE.ORG; ");
+        q = parse("default-src 'self' example.org; ");
+        p.union(q);
+        assertEquals("default-src 'self' EXAMPLE.ORG", p.show());
+
+        p = parse("default-src 'self' *.abc; ");
+        q = parse("default-src 'self' *.ABc; ");
+        p.union(q);
+        assertEquals("default-src 'self' *.abc", p.show());
+
+        p = parse("default-src 'self' *.abc/a; ");
+        q = parse("default-src 'self' *.ABc/a; ");
+        p.union(q);
+        assertEquals("default-src 'self' *.abc/a", p.show());
+
+        p = parse("default-src 'self' *.abc/a/b/c/; ");
+        q = parse("default-src 'self' *.ABc/a/B/c/; ");
+        p.union(q);
+        assertEquals("default-src 'self' *.abc/a/b/c/ *.ABc/a/B/c/", p.show());
+
+        p = parse("default-src 'self' *.abc/a; ");
+        q = parse("default-src 'self' *.ABc/A; ");
+        p.union(q);
+        assertEquals("default-src 'self' *.abc/a *.ABc/A", p.show());
+
+        p = parse("default-src 'self' http://abc/a; ");
+        q = parse("default-src 'self' hTtP://ABc/a; ");
+        p.union(q);
+        assertEquals("default-src 'self' http://abc/a", p.show());
+    }
+
 }
diff --git a/src/test/java/com/shapesecurity/salvation/PolicyQueryingTest.java b/src/test/java/com/shapesecurity/salvation/PolicyQueryingTest.java
index 4cc7cad..4b5a466 100644
--- a/src/test/java/com/shapesecurity/salvation/PolicyQueryingTest.java
+++ b/src/test/java/com/shapesecurity/salvation/PolicyQueryingTest.java
@@ -47,18 +47,37 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse("directive doesn't contain", d1.contains(value));
     }
 
+    @Test public void testDirectiveContainsCaseSensitivity() {
+        Policy p = parse("script-src a b c");
+        Policy q = parse("script-src A");
+        Policy r = parse("script-src M");
+        ScriptSrcDirective d1 = p.getDirectiveByType(ScriptSrcDirective.class);
+        ScriptSrcDirective d2 = q.getDirectiveByType(ScriptSrcDirective.class);
+        assertNotNull(d1);
+        assertNotNull(d2);
+        DirectiveValue value = d2.values().iterator().next();
+        assertTrue("directive contains", d1.contains(value));
+        ScriptSrcDirective d3 = r.getDirectiveByType(ScriptSrcDirective.class);
+        assertNotNull(d3);
+        value = d3.values().iterator().next();
+        assertFalse("directive doesn't contain", d1.contains(value));
+    }
+
     @Test public void testAllowsFromSource() {
         Policy p;
 
         p = Parser.parse(
-            "default-src 'none'; img-src https: 'self' http://abc.am/; style-src https://*.abc.am:*; script-src 'self' https://abc.am",
+            "default-src 'none'; img-src https: 'self' http://abc.am/; style-src https://*.abc.am:*; script-src 'self' https://abc.am https://*.cde.am/a",
             URI.parse("https://abc.com"));
         assertTrue("resource is allowed", p.allowsImgFromSource(URI.parse("https://a.com/12")));
         assertTrue("resource is allowed", p.allowsImgFromSource(URI.parse("https://abc.am")));
         assertTrue("resource is allowed", p.allowsScriptFromSource(URI.parse("https://abc.am")));
         assertTrue("resource is allowed", p.allowsImgFromSource(URI.parse("https://abc.com/12")));
+        assertTrue("resource is allowed", p.allowsScriptFromSource(URI.parse("httpS://www.cDE.am/a")));
+        assertTrue("resource is allowed", p.allowsScriptFromSource(URI.parse("https://www.cde.am/a")));
         assertFalse("resource is not allowed", p.allowsImgFromSource(URI.parse("http://a.com/12")));
         assertFalse("resource is not allowed", p.allowsStyleFromSource(URI.parse("ftp://www.abc.am:555")));
+        assertFalse("resource is not allowed", p.allowsScriptFromSource(URI.parse("https://www.cde.am/A")));
         assertFalse("resource is not allowed", p.allowsScriptFromSource(URI.parse("https://www.def.am:555")));
 
         p = Parser.parse("default-src 'none'", "https://abc.com");
@@ -219,6 +238,7 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/")));
@@ -229,9 +249,12 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/c")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A/b/c")));
+        assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/B/C")));
 
         p = Parser.parse("script-src example.com/a/b", "http://example.com");
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com")));
@@ -239,6 +262,7 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/B")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/c")));
 
@@ -250,6 +274,9 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/c")));
+        assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/C")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A/B/")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A/B/c")));
 
         p = Parser.parse("script-src example.com/a/b/c", "http://example.com");
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com")));
@@ -258,7 +285,9 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b")));
         assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/A/B/")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/c")));
+        assertFalse(p.allowsScriptFromSource(URI.parse("http://example.com/a/b/C")));
     }
 
     @Test public void testWildcards() {
@@ -271,6 +300,7 @@ public class PolicyQueryingTest extends CSPTest {
         assertTrue(p.allowsScriptFromSource(URI.parse("ftp://example.com")));
         assertTrue(p.allowsScriptFromSource(URI.parse("ftp://example.com:80")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/path")));
+        assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/PATH")));
         assertFalse(p.allowsScriptFromSource(new GUID("data:")));
 
         p = Parser.parse("script-src http://*", "http://example.com");
@@ -280,6 +310,7 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsScriptFromSource(URI.parse("ftp://example.com")));
         assertFalse(p.allowsScriptFromSource(URI.parse("ftp://example.com:80")));
         assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/path")));
+        assertTrue(p.allowsScriptFromSource(URI.parse("http://example.com/PATH")));
         assertFalse(p.allowsScriptFromSource(new GUID("data:")));
 
         p = Parser.parse("style-src *:80", "http://example.com");
@@ -289,6 +320,7 @@ public class PolicyQueryingTest extends CSPTest {
         assertFalse(p.allowsStyleFromSource(URI.parse("ftp://example.com")));
         assertFalse(p.allowsStyleFromSource(URI.parse("ftp://example.com:80")));
         assertTrue(p.allowsStyleFromSource(URI.parse("http://example.com/path")));
+        assertTrue(p.allowsStyleFromSource(URI.parse("http://example.com/PATH")));
         assertFalse(p.allowsStyleFromSource(new GUID("data:")));
 
         p = Parser.parse("style-src *:80", "https://example.com");