[PATCH v2] crypto/openssl: fix asym memory leaks

[Ciara Power]

Numerous memory leaks were detected by ASAN
in the OpenSSL PMD asymmetric code path.

These are now fixed to free all variables allocated
by OpenSSL functions such as BN_bin2bn and
OSSL_PARAM_BLD_new.

Some need to exist until the op is processed,
for example the BIGNUMs associated with DSA.
The pointers for these are added to the private
asym session so they can be accessed later when calling free.

Some cases need to be treated differently if OpenSSL < 3.0.
It has slightly different handling of memory, as functions such as
RSA_set0_key() take over memory management of values,
so the caller should not free the values.

Fixes: 4c7ae22f1f83 ("crypto/openssl: update DSA routine with 3.0 EVP API")
Fixes: c794b40c9258 ("crypto/openssl: update DH routine with 3.0 EVP API")
Fixes: 3b7d638fb11f ("crypto/openssl: support asymmetric SM2")
Fixes: ac42813a0a7c ("crypto/openssl: add DH and DSA asym operations")
Fixes: d7bd42f6db19 ("crypto/openssl: update RSA routine with 3.0 EVP API")
Fixes: ad149f93093e ("crypto/openssl: fix memory leaks in asym ops")
Cc: kai.ji at intel.com
Cc: gmuthukrishn at marvell.com
Cc: sunila.sahu at caviumnetworks.com
Cc: stable at dpdk.org

Signed-off-by: Ciara Power <ciara.power at intel.com>
Acked-by: Kai Ji <kai.ji at intel.com>

---
v2: Added a few more fixes for OpenSSL < 3.0 cases.
---
 drivers/crypto/openssl/openssl_pmd_private.h |  6 ++
 drivers/crypto/openssl/rte_openssl_pmd.c     |  1 +
 drivers/crypto/openssl/rte_openssl_pmd_ops.c | 98 +++++++++++++-------
 3 files changed, 73 insertions(+), 32 deletions(-)

diff --git a/drivers/crypto/openssl/openssl_pmd_private.h b/drivers/crypto/openssl/openssl_pmd_private.h
index 1edb669dfd..334912d335 100644
--- a/drivers/crypto/openssl/openssl_pmd_private.h
+++ b/drivers/crypto/openssl/openssl_pmd_private.h
@@ -190,6 +190,8 @@ struct openssl_asym_session {
 		struct dh {
 			DH *dh_key;
 			uint32_t key_op;
+			BIGNUM *p;
+			BIGNUM *g;
 #if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
 			OSSL_PARAM_BLD * param_bld;
 			OSSL_PARAM_BLD *param_bld_peer;
@@ -199,6 +201,10 @@ struct openssl_asym_session {
 			DSA *dsa;
 #if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
 			OSSL_PARAM_BLD * param_bld;
+			BIGNUM *p;
+			BIGNUM *g;
+			BIGNUM *q;
+			BIGNUM *priv_key;
 #endif
 		} s;
 		struct {
diff --git a/drivers/crypto/openssl/rte_openssl_pmd.c b/drivers/crypto/openssl/rte_openssl_pmd.c
index 9d463520ff..e8cb09defc 100644
--- a/drivers/crypto/openssl/rte_openssl_pmd.c
+++ b/drivers/crypto/openssl/rte_openssl_pmd.c
@@ -1960,6 +1960,7 @@ process_openssl_dsa_sign_op_evp(struct rte_crypto_op *cop,
 		OSSL_PARAM_free(params);
 	EVP_PKEY_CTX_free(key_ctx);
 	EVP_PKEY_CTX_free(dsa_ctx);
+	EVP_PKEY_free(pkey);
 	return ret;
 }
 
diff --git a/drivers/crypto/openssl/rte_openssl_pmd_ops.c b/drivers/crypto/openssl/rte_openssl_pmd_ops.c
index db5579bdb1..3d4f8a0e38 100644
--- a/drivers/crypto/openssl/rte_openssl_pmd_ops.c
+++ b/drivers/crypto/openssl/rte_openssl_pmd_ops.c
@@ -1032,7 +1032,7 @@ static int openssl_set_asym_session_parameters(
 		}
 		asym_session->u.r.rsa = rsa;
 		asym_session->xfrm_type = RTE_CRYPTO_ASYM_XFORM_RSA;
-		ret = 0;
+		break;
 #endif
 err_rsa:
 		BN_clear_free(n);
@@ -1106,22 +1106,22 @@ static int openssl_set_asym_session_parameters(
 	}
 	case RTE_CRYPTO_ASYM_XFORM_DH:
 	{
-		BIGNUM *p = NULL;
-		BIGNUM *g = NULL;
+		DH *dh = NULL;
+#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
+		BIGNUM **p = &asym_session->u.dh.p;
+		BIGNUM **g = &asym_session->u.dh.g;
 
-		p = BN_bin2bn((const unsigned char *)
+		*p = BN_bin2bn((const unsigned char *)
 				xform->dh.p.data,
 				xform->dh.p.length,
-				p);
-		g = BN_bin2bn((const unsigned char *)
+				*p);
+		*g = BN_bin2bn((const unsigned char *)
 				xform->dh.g.data,
 				xform->dh.g.length,
-				g);
-		if (!p || !g)
+				*g);
+		if (!*p || !*g)
 			goto err_dh;
 
-		DH *dh = NULL;
-#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
 		OSSL_PARAM_BLD *param_bld = NULL;
 		param_bld = OSSL_PARAM_BLD_new();
 		if (!param_bld) {
@@ -1131,9 +1131,9 @@ static int openssl_set_asym_session_parameters(
 		if ((!OSSL_PARAM_BLD_push_utf8_string(param_bld,
 					"group", "ffdhe2048", 0))
 			|| (!OSSL_PARAM_BLD_push_BN(param_bld,
-					OSSL_PKEY_PARAM_FFC_P, p))
+					OSSL_PKEY_PARAM_FFC_P, *p))
 			|| (!OSSL_PARAM_BLD_push_BN(param_bld,
-					OSSL_PKEY_PARAM_FFC_G, g))) {
+					OSSL_PKEY_PARAM_FFC_G, *g))) {
 			OSSL_PARAM_BLD_free(param_bld);
 			goto err_dh;
 		}
@@ -1148,9 +1148,9 @@ static int openssl_set_asym_session_parameters(
 		if ((!OSSL_PARAM_BLD_push_utf8_string(param_bld_peer,
 					"group", "ffdhe2048", 0))
 			|| (!OSSL_PARAM_BLD_push_BN(param_bld_peer,
-					OSSL_PKEY_PARAM_FFC_P, p))
+					OSSL_PKEY_PARAM_FFC_P, *p))
 			|| (!OSSL_PARAM_BLD_push_BN(param_bld_peer,
-					OSSL_PKEY_PARAM_FFC_G, g))) {
+					OSSL_PKEY_PARAM_FFC_G, *g))) {
 			OSSL_PARAM_BLD_free(param_bld);
 			OSSL_PARAM_BLD_free(param_bld_peer);
 			goto err_dh;
@@ -1159,6 +1159,20 @@ static int openssl_set_asym_session_parameters(
 		asym_session->u.dh.param_bld = param_bld;
 		asym_session->u.dh.param_bld_peer = param_bld_peer;
 #else
+		BIGNUM *p = NULL;
+		BIGNUM *g = NULL;
+
+		p = BN_bin2bn((const unsigned char *)
+				xform->dh.p.data,
+				xform->dh.p.length,
+				p);
+		g = BN_bin2bn((const unsigned char *)
+				xform->dh.g.data,
+				xform->dh.g.length,
+				g);
+		if (!p || !g)
+			goto err_dh;
+
 		dh = DH_new();
 		if (dh == NULL) {
 			OPENSSL_LOG(ERR,
@@ -1177,40 +1191,47 @@ static int openssl_set_asym_session_parameters(
 
 err_dh:
 		OPENSSL_LOG(ERR, " failed to set dh params\n");
+#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
+		BN_free(*p);
+		BN_free(*g);
+#else
 		BN_free(p);
 		BN_free(g);
+#endif
 		return -1;
 	}
 	case RTE_CRYPTO_ASYM_XFORM_DSA:
 	{
 #if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
-		BIGNUM *p = NULL, *g = NULL;
-		BIGNUM *q = NULL, *priv_key = NULL;
+		BIGNUM **p = &asym_session->u.s.p;
+		BIGNUM **g = &asym_session->u.s.g;
+		BIGNUM **q = &asym_session->u.s.q;
+		BIGNUM **priv_key = &asym_session->u.s.priv_key;
 		BIGNUM *pub_key = NULL;
 		OSSL_PARAM_BLD *param_bld = NULL;
 
-		p = BN_bin2bn((const unsigned char *)
+		*p = BN_bin2bn((const unsigned char *)
 				xform->dsa.p.data,
 				xform->dsa.p.length,
-				p);
+				*p);
 
-		g = BN_bin2bn((const unsigned char *)
+		*g = BN_bin2bn((const unsigned char *)
 				xform->dsa.g.data,
 				xform->dsa.g.length,
-				g);
+				*g);
 
-		q = BN_bin2bn((const unsigned char *)
+		*q = BN_bin2bn((const unsigned char *)
 				xform->dsa.q.data,
 				xform->dsa.q.length,
-				q);
-		if (!p || !q || !g)
+				*q);
+		if (!*p || !*q || !*g)
 			goto err_dsa;
 
-		priv_key = BN_bin2bn((const unsigned char *)
+		*priv_key = BN_bin2bn((const unsigned char *)
 				xform->dsa.x.data,
 				xform->dsa.x.length,
-				priv_key);
-		if (priv_key == NULL)
+				*priv_key);
+		if (*priv_key == NULL)
 			goto err_dsa;
 
 		param_bld = OSSL_PARAM_BLD_new();
@@ -1219,10 +1240,10 @@ static int openssl_set_asym_session_parameters(
 			goto err_dsa;
 		}
 
-		if (!OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_P, p)
-			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_G, g)
-			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_Q, q)
-			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_PRIV_KEY, priv_key)) {
+		if (!OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_P, *p)
+			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_G, *g)
+			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_FFC_Q, *q)
+			|| !OSSL_PARAM_BLD_push_BN(param_bld, OSSL_PKEY_PARAM_PRIV_KEY, *priv_key)) {
 			OSSL_PARAM_BLD_free(param_bld);
 			OPENSSL_LOG(ERR, "failed to allocate resources\n");
 			goto err_dsa;
@@ -1286,17 +1307,24 @@ static int openssl_set_asym_session_parameters(
 		if (ret) {
 			DSA_free(dsa);
 			OPENSSL_LOG(ERR, "Failed to set keys\n");
-			return -1;
+			goto err_dsa;
 		}
 		asym_session->u.s.dsa = dsa;
 		asym_session->xfrm_type = RTE_CRYPTO_ASYM_XFORM_DSA;
 		break;
 #endif
 err_dsa:
+#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
+		BN_free(*p);
+		BN_free(*q);
+		BN_free(*g);
+		BN_free(*priv_key);
+#else
 		BN_free(p);
 		BN_free(q);
 		BN_free(g);
 		BN_free(priv_key);
+#endif
 		BN_free(pub_key);
 		return -1;
 	}
@@ -1307,7 +1335,7 @@ static int openssl_set_asym_session_parameters(
 		OSSL_PARAM_BLD *param_bld = NULL;
 		OSSL_PARAM *params = NULL;
 		BIGNUM *pkey_bn = NULL;
-		uint8_t pubkey[64];
+		uint8_t pubkey[65];
 		size_t len = 0;
 		int ret = -1;
 
@@ -1462,11 +1490,17 @@ static void openssl_reset_asym_session(struct openssl_asym_session *sess)
 		if (sess->u.dh.dh_key)
 			DH_free(sess->u.dh.dh_key);
 #endif
+		BN_clear_free(sess->u.dh.p);
+		BN_clear_free(sess->u.dh.g);
 		break;
 	case RTE_CRYPTO_ASYM_XFORM_DSA:
 #if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
 		OSSL_PARAM_BLD_free(sess->u.s.param_bld);
 		sess->u.s.param_bld = NULL;
+		BN_clear_free(sess->u.s.p);
+		BN_clear_free(sess->u.s.q);
+		BN_clear_free(sess->u.s.g);
+		BN_clear_free(sess->u.s.priv_key);
 #else
 		if (sess->u.s.dsa)
 			DSA_free(sess->u.s.dsa);
-- 
2.25.1