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ext authz: add dns san support for ext authz service #7948

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merged 7 commits into from
Aug 22, 2019
Merged

ext authz: add dns san support for ext authz service #7948

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a7cbf3d
add dns san support for ext authz
ramaraochavali Aug 16, 2019
465a783
Merge remote-tracking branch 'upstream/master' into fix/ext_authz_dns…
ramaraochavali Aug 21, 2019
3da1534
update comment
ramaraochavali Aug 21, 2019
98a9866
proto doc and format
ramaraochavali Aug 21, 2019
7899e4f
refactor tests
ramaraochavali Aug 21, 2019
06f669a
address review comments
ramaraochavali Aug 22, 2019
d552c3f
Merge branch 'master' into fix/ext_authz_dns_san
ramaraochavali Aug 22, 2019
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4 changes: 2 additions & 2 deletions api/envoy/service/auth/v2/attribute_context.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,8 @@ message AttributeContext {
// The authenticated identity of this peer.
// For example, the identity associated with the workload such as a service account.
// If an X.509 certificate is used to assert the identity this field should be sourced from
// `Subject` or `Subject Alternative Names`. The primary identity should be the principal.
// The principal format is issuer specific.
// `URI Subject Alternative Names`, `DNS Subject Alternate Names` or `Subject` in that order.
// The primary identity should be the principal. The principal format is issuer specific.
//
// Example:
// * SPIFFE format is `spiffe://trust-domain/path`
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31 changes: 20 additions & 11 deletions source/extensions/filters/common/ext_authz/check_request_utils.cc
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Expand Up @@ -37,24 +37,33 @@ void CheckRequestUtils::setAttrContextPeer(envoy::service::auth::v2::AttributeCo
Envoy::Network::Utility::addressToProtobufAddress(*connection.remoteAddress(), *addr);
}

// Set the principal
// Preferably the SAN from the peer's cert or
// Subject from the peer's cert.
// Set the principal. Preferably the URI SAN, DNS SAN or Subject in that order from the peer's
// cert.
Ssl::ConnectionInfo* ssl = const_cast<Ssl::ConnectionInfo*>(connection.ssl());
if (ssl != nullptr) {
if (local) {
const auto uriSans = ssl->uriSanLocalCertificate();
if (uriSans.empty()) {
peer.set_principal(ssl->subjectLocalCertificate());
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Could you update the comment on

envoy/source/extensions/filters/common/ext_authz/check_request_utils.cc

Lines 40 to 42 in a7cbf3d

// Set the principal
// Preferably the SAN from the peer's cert or
// Subject from the peer's cert.
to be more complete and reflects this change?

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Update the comment.

const auto uri_sans = ssl->uriSanLocalCertificate();
if (uri_sans.empty()) {
const auto dns_sans = ssl->dnsSansLocalCertificate();
if (dns_sans.empty()) {
peer.set_principal(ssl->subjectLocalCertificate());
} else {
peer.set_principal(dns_sans[0]);
}
} else {
peer.set_principal(uriSans[0]);
peer.set_principal(uri_sans[0]);
}
} else {
const auto uriSans = ssl->uriSanPeerCertificate();
if (uriSans.empty()) {
peer.set_principal(ssl->subjectPeerCertificate());
const auto uri_sans = ssl->uriSanPeerCertificate();
if (uri_sans.empty()) {
const auto dns_sans = ssl->dnsSansPeerCertificate();
if (dns_sans.empty()) {
peer.set_principal(ssl->subjectPeerCertificate());
} else {
peer.set_principal(dns_sans[0]);
}
} else {
peer.set_principal(uriSans[0]);
peer.set_principal(uri_sans[0]);
}
}
}
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104 changes: 68 additions & 36 deletions test/extensions/filters/common/ext_authz/check_request_utils_test.cc
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Expand Up @@ -30,7 +30,7 @@ class CheckRequestUtilsTest : public testing::Test {
buffer_ = CheckRequestUtilsTest::newTestBuffer(8192);
};

void ExpectBasicHttp() {
void expectBasicHttp() {
EXPECT_CALL(callbacks_, connection()).Times(2).WillRepeatedly(Return(&connection_));
EXPECT_CALL(connection_, remoteAddress()).WillOnce(ReturnRef(addr_));
EXPECT_CALL(connection_, localAddress()).WillOnce(ReturnRef(addr_));
Expand All @@ -41,6 +41,33 @@ class CheckRequestUtilsTest : public testing::Test {
EXPECT_CALL(req_info_, protocol()).Times(2).WillRepeatedly(ReturnPointee(&protocol_));
}

void callHttpCheckAndValidateRequestAttributes() {
Http::TestHeaderMapImpl request_headers{{"x-envoy-downstream-service-cluster", "foo"},
{":path", "/bar"}};
envoy::service::auth::v2::CheckRequest request;
Protobuf::Map<std::string, std::string> context_extensions;
context_extensions["key"] = "value";

envoy::api::v2::core::Metadata metadata_context;
auto metadata_val = MessageUtil::keyValueStruct("foo", "bar");
(*metadata_context.mutable_filter_metadata())["meta.key"] = metadata_val;

CheckRequestUtils::createHttpCheck(&callbacks_, request_headers, std::move(context_extensions),
std::move(metadata_context), request, false);

EXPECT_EQ("source", request.attributes().source().principal());
EXPECT_EQ("destination", request.attributes().destination().principal());
EXPECT_EQ("foo", request.attributes().source().service());
EXPECT_EQ("value", request.attributes().context_extensions().at("key"));
EXPECT_EQ("bar", request.attributes()
.metadata_context()
.filter_metadata()
.at("meta.key")
.fields()
.at("foo")
.string_value());
}

static Buffer::InstancePtr newTestBuffer(uint64_t size) {
auto buffer = std::make_unique<Buffer::OwnedImpl>();
while (buffer->length() < size) {
Expand Down Expand Up @@ -84,7 +111,7 @@ TEST_F(CheckRequestUtilsTest, BasicHttp) {
// A client supplied EnvoyAuthPartialBody header should be ignored.
Http::TestHeaderMapImpl request_headers{{Http::Headers::get().EnvoyAuthPartialBody.get(), "1"}};

ExpectBasicHttp();
expectBasicHttp();
CheckRequestUtils::createHttpCheck(&callbacks_, request_headers,
Protobuf::Map<std::string, std::string>(),
envoy::api::v2::core::Metadata(), request_, size);
Expand All @@ -101,7 +128,7 @@ TEST_F(CheckRequestUtilsTest, BasicHttpWithPartialBody) {
Http::HeaderMapImpl headers_;
envoy::service::auth::v2::CheckRequest request_;

ExpectBasicHttp();
expectBasicHttp();
CheckRequestUtils::createHttpCheck(&callbacks_, headers_,
Protobuf::Map<std::string, std::string>(),
envoy::api::v2::core::Metadata(), request_, size);
Expand All @@ -116,7 +143,7 @@ TEST_F(CheckRequestUtilsTest, BasicHttpWithFullBody) {
Http::HeaderMapImpl headers_;
envoy::service::auth::v2::CheckRequest request_;

ExpectBasicHttp();
expectBasicHttp();
CheckRequestUtils::createHttpCheck(&callbacks_, headers_,
Protobuf::Map<std::string, std::string>(),
envoy::api::v2::core::Metadata(), request_, buffer_->length());
Expand All @@ -127,45 +154,50 @@ TEST_F(CheckRequestUtilsTest, BasicHttpWithFullBody) {
Http::Headers::get().EnvoyAuthPartialBody.get()));
}

// Verify that createHttpCheck extract the proper attributes from the http request into CheckRequest
// proto object.
TEST_F(CheckRequestUtilsTest, CheckAttrContextPeer) {
Http::TestHeaderMapImpl request_headers{{"x-envoy-downstream-service-cluster", "foo"},
{":path", "/bar"}};
envoy::service::auth::v2::CheckRequest request;
EXPECT_CALL(callbacks_, connection()).WillRepeatedly(Return(&connection_));
EXPECT_CALL(connection_, remoteAddress()).WillRepeatedly(ReturnRef(addr_));
EXPECT_CALL(connection_, localAddress()).WillRepeatedly(ReturnRef(addr_));
EXPECT_CALL(Const(connection_), ssl()).WillRepeatedly(Return(&ssl_));
EXPECT_CALL(callbacks_, streamId()).WillRepeatedly(Return(0));
EXPECT_CALL(callbacks_, streamInfo()).WillRepeatedly(ReturnRef(req_info_));
EXPECT_CALL(callbacks_, decodingBuffer()).Times(1);
EXPECT_CALL(req_info_, protocol()).WillRepeatedly(ReturnPointee(&protocol_));
// Verify that createHttpCheck extract the attributes from the HTTP request into CheckRequest
// proto object and URI SAN is used as principal if present.
TEST_F(CheckRequestUtilsTest, CheckAttrContextPeerUriSans) {
expectBasicHttp();

EXPECT_CALL(ssl_, uriSanPeerCertificate()).WillOnce(Return(std::vector<std::string>{"source"}));
EXPECT_CALL(ssl_, uriSanLocalCertificate())
.WillOnce(Return(std::vector<std::string>{"destination"}));

callHttpCheckAndValidateRequestAttributes();
}

// Verify that createHttpCheck extract the attributes from the HTTP request into CheckRequest
// proto object and DNS SAN is used as principal if URI SAN is absent.
TEST_F(CheckRequestUtilsTest, CheckAttrContextPeerDnsSans) {
expectBasicHttp();

EXPECT_CALL(ssl_, uriSanPeerCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, dnsSansPeerCertificate()).WillOnce(Return(std::vector<std::string>{"source"}));

EXPECT_CALL(ssl_, uriSanLocalCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, dnsSansLocalCertificate())
.WillOnce(Return(std::vector<std::string>{"destination"}));

Protobuf::Map<std::string, std::string> context_extensions;
context_extensions["key"] = "value";

envoy::api::v2::core::Metadata metadata_context;
auto metadata_val = MessageUtil::keyValueStruct("foo", "bar");
(*metadata_context.mutable_filter_metadata())["meta.key"] = metadata_val;

CheckRequestUtils::createHttpCheck(&callbacks_, request_headers, std::move(context_extensions),
std::move(metadata_context), request, false);

EXPECT_EQ("source", request.attributes().source().principal());
EXPECT_EQ("destination", request.attributes().destination().principal());
EXPECT_EQ("foo", request.attributes().source().service());
EXPECT_EQ("value", request.attributes().context_extensions().at("key"));
EXPECT_EQ("bar", request.attributes()
.metadata_context()
.filter_metadata()
.at("meta.key")
.fields()
.at("foo")
.string_value());
callHttpCheckAndValidateRequestAttributes();
}

// Verify that createHttpCheck extract the attributes from the HTTP request into CheckRequest
// proto object and Subject is used as principal if both URI SAN and DNS SAN are absent.
TEST_F(CheckRequestUtilsTest, CheckAttrContextSubject) {
expectBasicHttp();

EXPECT_CALL(ssl_, uriSanPeerCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, dnsSansPeerCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, subjectPeerCertificate()).WillOnce(Return("source"));

EXPECT_CALL(ssl_, uriSanLocalCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, dnsSansLocalCertificate()).WillOnce(Return(std::vector<std::string>{}));
EXPECT_CALL(ssl_, subjectLocalCertificate()).WillOnce(Return("destination"));

callHttpCheckAndValidateRequestAttributes();
}

} // namespace
Expand Down