From 85ccbab216da245cf9a6503dd327072f21950d9b Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tomas@openssl.org>
Date: 2024年5月17日 09:21:27 +0800
Subject: [PATCH] Check DSA parameters for excessive sizes before validating

This avoids overly long computation of various validation
checks.

Fixes CVE-2024-4603

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/24346)
---
 crypto/dsa/dsa_check.c | 44 ++++++++++++--
 .../invalid/p10240_q256_too_big.pem | 57 +++++++++++++++++++
 2 files changed, 97 insertions(+), 4 deletions(-)
 create mode 100644 test/recipes/15-test_dsaparam_data/invalid/p10240_q256_too_big.pem

diff --git a/crypto/dsa/dsa_check.c b/crypto/dsa/dsa_check.c
index fb0e912..122449a 100644
--- a/crypto/dsa/dsa_check.c
+++ b/crypto/dsa/dsa_check.c
@@ -19,8 +19,34 @@
 #include "dsa_local.h"
 #include "crypto/dsa.h"
 
+static int dsa_precheck_params(const DSA *dsa, int *ret)
+{
+ if (dsa->params.p == NULL || dsa->params.q == NULL) {
+ ERR_raise(ERR_LIB_DSA, DSA_R_BAD_FFC_PARAMETERS);
+ *ret = FFC_CHECK_INVALID_PQ;
+ return 0;
+ }
+
+ if (BN_num_bits(dsa->params.p) > OPENSSL_DSA_MAX_MODULUS_BITS) {
+ ERR_raise(ERR_LIB_DSA, DSA_R_MODULUS_TOO_LARGE);
+ *ret = FFC_CHECK_INVALID_PQ;
+ return 0;
+ }
+
+ if (BN_num_bits(dsa->params.q) >= BN_num_bits(dsa->params.p)) {
+ ERR_raise(ERR_LIB_DSA, DSA_R_BAD_Q_VALUE);
+ *ret = FFC_CHECK_INVALID_PQ;
+ return 0;
+ }
+
+ return 1;
+}
+
 int ossl_dsa_check_params(const DSA *dsa, int checktype, int *ret)
 {
+ if (!dsa_precheck_params(dsa, ret))
+ return 0;
+
 if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
 return ossl_ffc_params_simple_validate(dsa->libctx, &dsa->params,
 FFC_PARAM_TYPE_DSA, ret);
@@ -39,6 +65,9 @@ int ossl_dsa_check_params(const DSA *dsa, int checktype, int *ret)
 */
 int ossl_dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret)
 {
+ if (!dsa_precheck_params(dsa, ret))
+ return 0;
+
 return ossl_ffc_validate_public_key(&dsa->params, pub_key, ret)
 && *ret == 0;
 }
@@ -50,6 +79,9 @@ int ossl_dsa_check_pub_key(const DSA *dsa, const BIGNUM *pub_key, int *ret)
 */
 int ossl_dsa_check_pub_key_partial(const DSA *dsa, const BIGNUM *pub_key, int *ret)
 {
+ if (!dsa_precheck_params(dsa, ret))
+ return 0;
+
 return ossl_ffc_validate_public_key_partial(&dsa->params, pub_key, ret)
 && *ret == 0;
 }
@@ -58,8 +90,10 @@ int ossl_dsa_check_priv_key(const DSA *dsa, const BIGNUM *priv_key, int *ret)
 {
 *ret = 0;
 
- return (dsa->params.q != NULL
- && ossl_ffc_validate_private_key(dsa->params.q, priv_key, ret));
+ if (!dsa_precheck_params(dsa, ret))
+ return 0;
+
+ return ossl_ffc_validate_private_key(dsa->params.q, priv_key, ret);
 }
 
 /*
@@ -72,8 +106,10 @@ int ossl_dsa_check_pairwise(const DSA *dsa)
 BN_CTX *ctx = NULL;
 BIGNUM *pub_key = NULL;
 
- if (dsa->params.p == NULL
- || dsa->params.g == NULL
+ if (!dsa_precheck_params(dsa, &ret))
+ return 0;
+
+ if (dsa->params.g == NULL
 || dsa->priv_key == NULL
 || dsa->pub_key == NULL)
 return 0;
diff --git a/test/recipes/15-test_dsaparam_data/invalid/p10240_q256_too_big.pem b/test/recipes/15-test_dsaparam_data/invalid/p10240_q256_too_big.pem
new file mode 100644
index 0000000..e85e295
--- /dev/null
+++ b/test/recipes/15-test_dsaparam_data/invalid/p10240_q256_too_big.pem
@@ -0,0 +1,57 @@
+-----BEGIN DSA PARAMETERS-----
+MIIKLAKCBQEAym47LzPFZdbz16WvjczLKuzLtsP8yRk/exxL4bBthJhP1qOwctja
+p1586SF7gDxCMn7yWVEYdfRbFefGoq0gj1XOE917XqlbnkmZhMgxut2KbNJo/xil
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+pR71bRZrEEegDj0LH2HCgI5W6H3blOS9A0kUTddCoQXr2lsVdiPtRbPKH1gcd9FQ
+P8cGrvbakpTiC0dCczOMDaCteM1QNILlkM7ZoV6VghsKvDnFPxFsiIr5GgjasXP5
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+koyEmMSp53lldCzp158PrIanqSp2rksMR8SmmCL3FwfAp2OjqFMEglG9DT8x0WaN
+TLSkjGC6t2csMte7WyU1ekNoFDKfMjDSAz0+xIx21DEmZtYqFOg1DNPK1xYLS0pl
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+vKuje86bePD6kD/LH3wmkA==
+-----END DSA PARAMETERS-----
-- 
2.33.0