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From 8b8fd22a168860c5034822472d1fb5745f8fa0f5 Mon Sep 17 00:00:00 2001
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From: Jakub Hrozek <jhrozek@redhat.com>
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Date: Wed, 16 Jun 2021 10:18:30 +0200
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Subject: [PATCH] Fix lasso_query_sign HMAC other than SHA1 (#54037)
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The switch clause was using SHA1 digests for all digest types when
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signing. This obviously breaks verifying the signatures if HMAC-SHAXXX
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is used and XXX is something else than 1.
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---
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lasso/xml/tools.c | 35 +++++++++++++++++++++++------------
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tests/login_tests_saml2.c | 6 +++---
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2 files changed, 26 insertions(+), 15 deletions(-)
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diff --git a/lasso/xml/tools.c b/lasso/xml/tools.c
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index 96d88a2c4..290fd55f2 100644
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--- a/lasso/xml/tools.c
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+++ b/lasso/xml/tools.c
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@@ -594,22 +594,20 @@ lasso_query_sign(char *query, LassoSignatureContext context)
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sigret_size = DSA_size(dsa);
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break;
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case LASSO_SIGNATURE_METHOD_HMAC_SHA1:
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+ md = EVP_sha1();
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+ sigret_size = EVP_MD_size(md);
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+ break;
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case LASSO_SIGNATURE_METHOD_HMAC_SHA256:
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+ md = EVP_sha256();
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+ sigret_size = EVP_MD_size(md);
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+ break;
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case LASSO_SIGNATURE_METHOD_HMAC_SHA384:
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+ md = EVP_sha384();
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+ sigret_size = EVP_MD_size(md);
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+ break;
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case LASSO_SIGNATURE_METHOD_HMAC_SHA512:
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- if ((rc = lasso_get_hmac_key(key, (void**)&hmac_key,
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- &hmac_key_length))) {
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- message(G_LOG_LEVEL_CRITICAL, "Failed to get hmac key (%s)", lasso_strerror(rc));
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- goto done;
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- }
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- g_assert(hmac_key);
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- md = EVP_sha1();
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+ md = EVP_sha512();
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sigret_size = EVP_MD_size(md);
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- /* key should be at least 128 bits long */
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- if (hmac_key_length < 16) {
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- critical("HMAC key should be at least 128 bits long");
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- goto done;
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- }
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break;
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default:
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g_assert_not_reached();
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@@ -645,6 +643,19 @@ lasso_query_sign(char *query, LassoSignatureContext context)
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case LASSO_SIGNATURE_METHOD_HMAC_SHA256:
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case LASSO_SIGNATURE_METHOD_HMAC_SHA384:
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case LASSO_SIGNATURE_METHOD_HMAC_SHA512:
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+ if ((rc = lasso_get_hmac_key(key, (void**)&hmac_key,
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+ &hmac_key_length))) {
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+ message(G_LOG_LEVEL_CRITICAL, "Failed to get hmac key (%s)", lasso_strerror(rc));
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+ goto done;
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+ }
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+ g_assert(hmac_key);
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+
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+ /* key should be at least 128 bits long */
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+ if (hmac_key_length < 16) {
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+ critical("HMAC key should be at least 128 bits long");
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+ goto done;
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+ }
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+
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HMAC(md, hmac_key, hmac_key_length, (unsigned char *)new_query,
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strlen(new_query), sigret, &siglen);
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status = 1;
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diff --git a/tests/login_tests_saml2.c b/tests/login_tests_saml2.c
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index e331c07a7..e1d78b5b1 100644
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--- a/tests/login_tests_saml2.c
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+++ b/tests/login_tests_saml2.c
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@@ -981,7 +981,7 @@ sso_initiated_by_sp(LassoServer *idp_context, LassoServer *sp_context, SsoCallba
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lasso_release_gobject(sp_login_context);
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}
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-START_TEST(test07_sso_sp_with_hmac_sha1_signatures)
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+START_TEST(test07_sso_sp_with_hmac_sha256_signatures)
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{
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LassoServer *idp_context = NULL;
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LassoServer *sp_context = NULL;
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@@ -990,7 +990,7 @@ START_TEST(test07_sso_sp_with_hmac_sha1_signatures)
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/* Create the shared key */
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key = lasso_key_new_for_signature_from_memory("xxxxxxxxxxxxxxxx", 16,
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- NULL, LASSO_SIGNATURE_METHOD_HMAC_SHA1, NULL);
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+ NULL, LASSO_SIGNATURE_METHOD_HMAC_SHA256, NULL);
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check_true(LASSO_IS_KEY(key));
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/* Create an IdP context for IdP initiated SSO with provider metadata 1 */
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@@ -1640,7 +1640,7 @@ login_saml2_suite()
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tcase_add_test(tc_spSloSoap, test04_sso_then_slo_soap);
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tcase_add_test(tc_idpKeyRollover, test05_sso_idp_with_key_rollover);
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tcase_add_test(tc_spKeyRollover, test06_sso_sp_with_key_rollover);
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- tcase_add_test(tc_hmacSignature, test07_sso_sp_with_hmac_sha1_signatures);
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+ tcase_add_test(tc_hmacSignature, test07_sso_sp_with_hmac_sha256_signatures);
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tcase_add_test(tc_spLogin, test08_test_authnrequest_flags);
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tcase_add_test(tc_ecp, test09_ecp);
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tcase_add_test(tc_ecp, test10_ecp);
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--
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2.26.3
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