backport mozbug 1334776 - CVE-2017-7797 Header name interning leaks across origins

Potential attack: session supercookie.

[Moz Notes](https://bugzilla.mozilla.org/show_bug.cgi?id=1334776#c5):
"The problem is that for unknown header names we store the first one we see and then later we case-insensitively match against that name *globally*. That means you can track if a user agent has already seen a certain header name used (by using a different casing and observing whether it gets normalized). This would allow you to see if a user has used a sensitive service that uses custom header names, or allows you to track a user across sites, by teaching the browser about a certain header case once and then observing if different casings get normalized to that.

What we should do instead is only store the casing for a header name for each header list and not globally. That way it only leaks where it's expected (and necessary) to leak."

[Moz fix note](https://bugzilla.mozilla.org/show_bug.cgi?id=1334776#c8):
"nsHttpAtom now holds the old nsHttpAtom and a string that is case sensitive (only for not standard headers).
So nsHttpAtom holds a pointer to a header name. (header names are store on a static structure). This is how it used to be. I left that part the same but added a nsCString which holds a string that was used to resoled the header name. So when we parse headers we call ResolveHeader with a char*. If it is a new header name the char* will be stored in a HttpHeapAtom, nsHttpAtom::_val will point to HttpHeapAtom::value and the same strings will be stored in mLocalCaseSensitiveHeader. For the first resolve request they will be the same but for the following maybe not. At the end this nsHttpAtom will be stored in nsHttpHeaderArray. For all operation we will used the old char* except when we are returning it to a script using VisitHeaders."

10 files changed, 33 insertions, 33 deletions

diff --git a/devtools/client/netmonitor/filter-predicates.js b/devtools/client/netmonitor/filter-predicates.js
index 9c8e49c62..75ee422aa 100644
--- a/devtools/client/netmonitor/filter-predicates.js
+++ b/devtools/client/netmonitor/filter-predicates.js
@@ -72,7 +72,7 @@ function isWS({ requestHeaders, responseHeaders }) {
 
   // Find the 'upgrade' header.
   let upgradeHeader = requestHeaders.headers.find(header => {
-    return (header.name == "Upgrade");
+    return (header.name.toLowerCase() == "upgrade");
   });
 
   // If no header found on request, check response - mainly to get
@@ -81,7 +81,7 @@ function isWS({ requestHeaders, responseHeaders }) {
   if (!upgradeHeader && responseHeaders &&
       Array.isArray(responseHeaders.headers)) {
     upgradeHeader = responseHeaders.headers.find(header => {
-      return (header.name == "Upgrade");
+      return (header.name.toLowerCase() == "upgrade");
     });
   }
 
diff --git a/devtools/client/netmonitor/test/browser_net_copy_headers.js b/devtools/client/netmonitor/test/browser_net_copy_headers.js
index 36ce2fb34..bb582c8e1 100644
--- a/devtools/client/netmonitor/test/browser_net_copy_headers.js
+++ b/devtools/client/netmonitor/test/browser_net_copy_headers.js
@@ -49,12 +49,12 @@ add_task(function* () {
 
   const EXPECTED_RESPONSE_HEADERS = [
     `${httpVersion} ${status} ${statusText}`,
-    "Last-Modified: Sun, 3 May 2015 11:11:11 GMT",
-    "Content-Type: text/html",
-    "Content-Length: 465",
-    "Connection: close",
-    "Server: httpd.js",
-    "Date: Sun, 3 May 2015 11:11:11 GMT"
+    "last-modified: Sun, 3 May 2015 11:11:11 GMT",
+    "content-type: text/html",
+    "content-length: 465",
+    "connection: close",
+    "server: httpd.js",
+    "date: Sun, 3 May 2015 11:11:11 GMT"
   ].join("\n");
 
   yield waitForClipboardPromise(function setup() {
@@ -62,8 +62,8 @@ add_task(function* () {
   }, function validate(result) {
     // Fake the "Last-Modified" and "Date" headers because they will vary:
     result = String(result)
-      .replace(/Last-Modified: [^\n]+ GMT/, "Last-Modified: Sun, 3 May 2015 11:11:11 GMT")
-      .replace(/Date: [^\n]+ GMT/, "Date: Sun, 3 May 2015 11:11:11 GMT");
+      .replace(/last-modified: [^\n]+ GMT/, "last-modified: Sun, 3 May 2015 11:11:11 GMT")
+      .replace(/date: [^\n]+ GMT/, "date: Sun, 3 May 2015 11:11:11 GMT");
     return result === EXPECTED_RESPONSE_HEADERS;
   });
   info("Clipboard contains the currently selected item's response headers.");
diff --git a/devtools/client/netmonitor/test/browser_net_timing-division.js b/devtools/client/netmonitor/test/browser_net_timing-division.js
index 0114ba235..ff2379dc2 100644
--- a/devtools/client/netmonitor/test/browser_net_timing-division.js
+++ b/devtools/client/netmonitor/test/browser_net_timing-division.js
@@ -48,9 +48,9 @@ add_task(function* () {
   let lastRequest = RequestsMenu.getItemAtIndex(1);
 
   info("First request happened at: " +
-    firstRequest.attachment.responseHeaders.headers.find(e => e.name == "Date").value);
+    firstRequest.attachment.responseHeaders.headers.find(e => e.name == "date").value);
   info("Last request happened at: " +
-    lastRequest.attachment.responseHeaders.headers.find(e => e.name == "Date").value);
+    lastRequest.attachment.responseHeaders.headers.find(e => e.name == "date").value);
 
   ok(secDivs.length,
     "There should be at least one division on the seconds time scale.");
diff --git a/devtools/client/shared/AppCacheUtils.jsm b/devtools/client/shared/AppCacheUtils.jsm
index a2beca993..9fd4d0541 100644
--- a/devtools/client/shared/AppCacheUtils.jsm
+++ b/devtools/client/shared/AppCacheUtils.jsm
@@ -86,7 +86,7 @@ AppCacheUtils.prototype = {
   _parseManifest: function ACU__parseManifest(uriInfo) {
     let deferred = defer();
     let manifestName = uriInfo.name;
-    let manifestLastModified = new Date(uriInfo.responseHeaders["Last-Modified"]);
+    let manifestLastModified = new Date(uriInfo.responseHeaders["last-modified"]);
 
     if (uriInfo.charset.toLowerCase() != "utf-8") {
       this._addError(0, "notUTF8", uriInfo.charset);
@@ -158,7 +158,7 @@ AppCacheUtils.prototype = {
           // Check that the resource was not modified after the manifest was last
           // modified. If it was then the manifest file should be refreshed.
           let resourceLastModified =
-            new Date(uriInfo.responseHeaders["Last-Modified"]);
+            new Date(uriInfo.responseHeaders["last-modified"]);
 
           if (manifestLastModified < resourceLastModified) {
             this._addError(parsedUri.line, "fileChangedButNotManifest",
@@ -230,12 +230,12 @@ AppCacheUtils.prototype = {
 
           result.requestHeaders = {};
           request.visitRequestHeaders(function (header, value) {
-            result.requestHeaders[header] = value;
+            result.responseHeaders[header.toLowerCase()] = value;
           });
 
           result.responseHeaders = {};
           request.visitResponseHeaders(function (header, value) {
-            result.responseHeaders[header] = value;
+            result.responseHeaders[header.toLowerCase()] = value;
           });
 
           deferred.resolve(result);
diff --git a/devtools/client/shared/curl.js b/devtools/client/shared/curl.js
index 420fe6aa5..6d33ad971 100644
--- a/devtools/client/shared/curl.js
+++ b/devtools/client/shared/curl.js
@@ -81,14 +81,14 @@ const Curl = {
       postDataText = data.postDataText;
       postData.push("--data");
       postData.push(escapeString(utils.writePostDataTextParams(postDataText)));
-      ignoredHeaders.add("Content-Length");
+      ignoredHeaders.add("content-length");
     } else if (multipartRequest) {
       postDataText = data.postDataText;
       postData.push("--data-binary");
       let boundary = utils.getMultipartBoundary(data);
       let text = utils.removeBinaryDataFromMultipartText(postDataText, boundary);
       postData.push(escapeString(text));
-      ignoredHeaders.add("Content-Length");
+      ignoredHeaders.add("content-length");
     }
 
     // Add method.
@@ -125,11 +125,11 @@ const Curl = {
     }
     for (let i = 0; i < headers.length; i++) {
       let header = headers[i];
-      if (header.name === "Accept-Encoding") {
+      if (header.name.toLowerCase() === "accept-encoding") {
         command.push("--compressed");
         continue;
       }
-      if (ignoredHeaders.has(header.name)) {
+      if (ignoredHeaders.has(header.name.toLowerCase())) {
         continue;
       }
       command.push("-H");
diff --git a/devtools/client/webconsole/net/test/mochitest/browser_net_headers.js b/devtools/client/webconsole/net/test/mochitest/browser_net_headers.js
index 4a47074ee..14cde846c 100644
--- a/devtools/client/webconsole/net/test/mochitest/browser_net_headers.js
+++ b/devtools/client/webconsole/net/test/mochitest/browser_net_headers.js
@@ -26,11 +26,11 @@ add_task(function* () {
   // Select "Headers" tab
   let tabBody = yield selectNetInfoTab(hud, netInfoBody, "headers");
   let paramName = tabBody.querySelector(
-    ".netInfoParamName > span[title='Content-Type']");
+    ".netInfoParamName > span[title='content-type']");
 
   // Verify "Content-Type" header (name and value)
   ok(paramName, "Header name must exist");
-  is(paramName.textContent, "Content-Type",
+  is(paramName.textContent, "content-type",
     "The header name must have proper value");
 
   let paramValue = paramName.parentNode.nextSibling;
diff --git a/devtools/client/webconsole/test/browser_webconsole_bug_630733_response_redirect_headers.js b/devtools/client/webconsole/test/browser_webconsole_bug_630733_response_redirect_headers.js
index 509749953..da4bdcf12 100644
--- a/devtools/client/webconsole/test/browser_webconsole_bug_630733_response_redirect_headers.js
+++ b/devtools/client/webconsole/test/browser_webconsole_bug_630733_response_redirect_headers.js
@@ -87,7 +87,7 @@ function getContent() {
 function performTest() {
   function readHeader(name) {
     for (let header of headers) {
-      if (header.name == name) {
+      if (header.name.toLowerCase() == name.toLowerCase()) {
         return header.value;
       }
     }
diff --git a/devtools/shared/webconsole/test/test_network_get.html b/devtools/shared/webconsole/test/test_network_get.html
index 710c9b0d7..c2313be12 100644
--- a/devtools/shared/webconsole/test/test_network_get.html
+++ b/devtools/shared/webconsole/test/test_network_get.html
@@ -196,13 +196,13 @@ function onResponseHeaders(aState, aResponse)
   ok(!!aResponse.rawHeaders, "response rawHeaders available");
 
   checkHeadersOrCookies(aResponse.headers, {
-    "Content-Type": /^application\/(json|octet-stream)$/,
-    "Content-Length": /^\d+$/,
+    "content-type": /^application\/(json|octet-stream)$/,
+    "content-length": /^\d+$/,
   });
 
   checkRawHeaders(aResponse.rawHeaders, {
-    "Content-Type": /^application\/(json|octet-stream)$/,
-    "Content-Length": /^\d+$/,
+    "content-type": /^application\/(json|octet-stream)$/,
+    "content-length": /^\d+$/,
   });
 
   onResponseCookies = onResponseCookies.bind(null, aState);
diff --git a/devtools/shared/webconsole/test/test_network_longstring.html b/devtools/shared/webconsole/test/test_network_longstring.html
index d55136896..9e6ea7771 100644
--- a/devtools/shared/webconsole/test/test_network_longstring.html
+++ b/devtools/shared/webconsole/test/test_network_longstring.html
@@ -212,8 +212,8 @@ function onResponseHeaders(aState, aResponse)
   ok(aResponse.headersSize > 0, "response headersSize > 0");
 
   checkHeadersOrCookies(aResponse.headers, {
-    "Content-Type": /^application\/(json|octet-stream)$/,
-    "Content-Length": /^\d+$/,
+    "content-type": /^application\/(json|octet-stream)$/,
+    "content-length": /^\d+$/,
     "x-very-short": "hello world",
     "x-very-long": {
       "type": "longString",
diff --git a/devtools/shared/webconsole/test/test_network_post.html b/devtools/shared/webconsole/test/test_network_post.html
index d96b9b0b7..a0b8edb64 100644
--- a/devtools/shared/webconsole/test/test_network_post.html
+++ b/devtools/shared/webconsole/test/test_network_post.html
@@ -204,13 +204,13 @@ function onResponseHeaders(aState, aResponse)
   ok(!!aResponse.rawHeaders, "response rawHeaders available");
 
   checkHeadersOrCookies(aResponse.headers, {
-    "Content-Type": /^application\/(json|octet-stream)$/,
-    "Content-Length": /^\d+$/,
+    "content-type": /^application\/(json|octet-stream)$/,
+    "content-length": /^\d+$/,
   });
 
   checkRawHeaders(aResponse.rawHeaders, {
-    "Content-Type": /^application\/(json|octet-stream)$/,
-    "Content-Length": /^\d+$/,
+    "content-type": /^application\/(json|octet-stream)$/,
+    "content-length": /^\d+$/,
   });
 
   onResponseCookies = onResponseCookies.bind(null, aState);