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HTTPSock: tighten hardening header defaults

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Switch the default Referrer-Policy from same-origin to no-referrer so the
webadmin URL (which can carry user/network names in the path) does not
leak to outbound clicks either.

Drop Pragma: no-cache; it is deprecated and modern intermediaries honor
Cache-Control. Simplify Cache-Control to a single no-store directive,
which on its own already prevents storing per RFC 9111; the previous
no-cache, must-revalidate, max-age=0 tail was HTTP/1.0-era padding.
This commit is contained in:
MarkLee131
2026-05-04 20:35:23 +08:00
parent f71e021e3b
commit 83e7eefc21
2 changed files with 8 additions and 14 deletions
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test/HTTPSockTest.cpp
+6 -10
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@@ -79,8 +79,8 @@ class HTTPSockHeadersTest : public ::testing::Test {
// Hardening response headers introduced for #2012. The fix's contract:
// - emit X-Frame-Options, X-Content-Type-Options, Referrer-Policy on every
// response (unless the caller already set them or asked to omit them);
// - emit no-store Cache-Control + Pragma for dynamic responses, but skip
// for 304 and for static asset MIME types whose freshness is handled by
// - emit a no-store Cache-Control for dynamic responses, but skip it for
// 304 and for static asset MIME types whose freshness is handled by
// ETag/Last-Modified;
// - never duplicate a header the caller already added via AddHeader;
// - skip a header entirely when the caller calls OmitHardeningHeader.
@@ -89,9 +89,8 @@ TEST_F(HTTPSockHeadersTest, HardeningHeadersDefaultDynamicResponse) {
sock.PrintHeader(0, "text/html");
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("X-Frame-Options: SAMEORIGIN")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("X-Content-Type-Options: nosniff")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Referrer-Policy: same-origin")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Cache-Control:")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Pragma: no-cache")));
EXPECT_THAT(sock.m_vsLines, Contains(CString("Referrer-Policy: no-referrer\r\n")));
EXPECT_THAT(sock.m_vsLines, Contains(CString("Cache-Control: no-store\r\n")));
}
TEST_F(HTTPSockHeadersTest, HardeningHeadersSkipCacheControlOn304) {
@@ -99,7 +98,6 @@ TEST_F(HTTPSockHeadersTest, HardeningHeadersSkipCacheControlOn304) {
sock.PrintHeader(0, "text/html", 304, "Not Modified");
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("X-Frame-Options:")));
EXPECT_THAT(sock.m_vsLines, Not(Contains(StartsWith("Cache-Control:"))));
EXPECT_THAT(sock.m_vsLines, Not(Contains(StartsWith("Pragma:"))));
}
TEST_F(HTTPSockHeadersTest, HardeningHeadersSkipCacheControlForStaticAssets) {
@@ -128,7 +126,7 @@ TEST_F(HTTPSockHeadersTest, HardeningHeadersDeferToCallerXFrameOptions) {
EXPECT_THAT(sock.m_vsLines, Contains(CString("X-Frame-Options: DENY\r\n")));
// Other defaults still emitted.
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("X-Content-Type-Options: nosniff")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Referrer-Policy: same-origin")));
EXPECT_THAT(sock.m_vsLines, Contains(CString("Referrer-Policy: no-referrer\r\n")));
}
TEST_F(HTTPSockHeadersTest, HardeningHeadersDeferToCallerCacheControl) {
@@ -138,8 +136,6 @@ TEST_F(HTTPSockHeadersTest, HardeningHeadersDeferToCallerCacheControl) {
// No no-store default; only the caller's value should be emitted.
EXPECT_THAT(sock.m_vsLines, Not(Contains(StartsWith("Cache-Control: no-store"))));
EXPECT_THAT(sock.m_vsLines, Contains(CString("Cache-Control: max-age=300\r\n")));
// Pragma is independently controlled and still emitted as a default.
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Pragma: no-cache")));
}
TEST_F(HTTPSockHeadersTest, HardeningHeadersOmittedByCaller) {
@@ -152,5 +148,5 @@ TEST_F(HTTPSockHeadersTest, HardeningHeadersOmittedByCaller) {
EXPECT_THAT(sock.m_vsLines, Not(Contains(StartsWith("Cache-Control:"))));
// Other defaults unaffected.
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("X-Content-Type-Options: nosniff")));
EXPECT_THAT(sock.m_vsLines, Contains(StartsWith("Pragma: no-cache")));
EXPECT_THAT(sock.m_vsLines, Contains(CString("Referrer-Policy: no-referrer\r\n")));
}