make RSA and DSA operations throw MISSING_PRIVATE_KEY if needed, adapt ECDSA

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NNicola Tuveri <nic.tuv@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/9466)

(cherry picked from commit 7408f6759f1b0100438ca236ea8f549454aaf2d5)

crypto/dsa/dsa_err.c

@@ -52,6 +52,8 @@ static const ERR_STRING_DATA DSA_str_reasons[] = {
     "invalid digest type"},
     {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_INVALID_PARAMETERS), "invalid parameters"},
     {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_MISSING_PARAMETERS), "missing parameters"},
+    {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_MISSING_PRIVATE_KEY),
+    "missing private key"},
     {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_MODULUS_TOO_LARGE), "modulus too large"},
     {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_NO_PARAMETERS_SET), "no parameters set"},
     {ERR_PACK(ERR_LIB_DSA, 0, DSA_R_PARAMETER_ENCODING_ERROR),

crypto/dsa/dsa_ossl.c

@@ -72,6 +72,10 @@ static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
         reason = DSA_R_MISSING_PARAMETERS;
         goto err;
     }
+    if (dsa->priv_key == NULL) {
+        reason = DSA_R_MISSING_PRIVATE_KEY;
+        goto err;
+    }
 
     ret = DSA_SIG_new();
     if (ret == NULL)
@@ -195,6 +199,10 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
         DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_INVALID_PARAMETERS);
         return 0;
     }
+    if (dsa->priv_key == NULL) {
+        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PRIVATE_KEY);
+        return 0;
+    }
 
     k = BN_new();
     l = BN_new();

crypto/ec/ecdh_ossl.c

@@ -58,7 +58,7 @@ int ecdh_simple_compute_key(unsigned char **pout, size_t *poutlen,
 
     priv_key = EC_KEY_get0_private_key(ecdh);
     if (priv_key == NULL) {
-        ECerr(EC_F_ECDH_SIMPLE_COMPUTE_KEY, EC_R_NO_PRIVATE_VALUE);
+        ECerr(EC_F_ECDH_SIMPLE_COMPUTE_KEY, EC_R_MISSING_PRIVATE_KEY);
         goto err;
     }
 

crypto/ec/ecdsa_ossl.c

@@ -41,11 +41,16 @@ static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
     const EC_GROUP *group;
     int ret = 0;
     int order_bits;
+    const BIGNUM *priv_key;
 
     if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
         ECerr(EC_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER);
         return 0;
     }
+    if ((priv_key = EC_KEY_get0_private_key(eckey)) == NULL) {
+        ECerr(EC_F_ECDSA_SIGN_SETUP, EC_R_MISSING_PRIVATE_KEY);
+        return 0;
+    }
 
     if (!EC_KEY_can_sign(eckey)) {
         ECerr(EC_F_ECDSA_SIGN_SETUP, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
@@ -83,8 +88,7 @@ static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
         /* get random k */
         do {
             if (dgst != NULL) {
-                if (!BN_generate_dsa_nonce(k, order,
-                                           EC_KEY_get0_private_key(eckey),
+                if (!BN_generate_dsa_nonce(k, order, priv_key,
                                            dgst, dlen, ctx)) {
                     ECerr(EC_F_ECDSA_SIGN_SETUP,
                           EC_R_RANDOM_NUMBER_GENERATION_FAILED);
@@ -162,10 +166,14 @@ ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
     group = EC_KEY_get0_group(eckey);
     priv_key = EC_KEY_get0_private_key(eckey);
 
-    if (group == NULL || priv_key == NULL) {
+    if (group == NULL) {
         ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, ERR_R_PASSED_NULL_PARAMETER);
         return NULL;
     }
+    if (priv_key == NULL) {
+        ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_MISSING_PRIVATE_KEY);
+        return NULL;
+    }
 
     if (!EC_KEY_can_sign(eckey)) {
         ECerr(EC_F_OSSL_ECDSA_SIGN_SIG, EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);

crypto/err/openssl.txt

@@ -2101,6 +2101,7 @@ DSA_R_DECODE_ERROR:104:decode error
 DSA_R_INVALID_DIGEST_TYPE:106:invalid digest type
 DSA_R_INVALID_PARAMETERS:112:invalid parameters
 DSA_R_MISSING_PARAMETERS:101:missing parameters
+DSA_R_MISSING_PRIVATE_KEY:111:missing private key
 DSA_R_MODULUS_TOO_LARGE:103:modulus too large
 DSA_R_NO_PARAMETERS_SET:107:no parameters set
 DSA_R_PARAMETER_ENCODING_ERROR:105:parameter encoding error
@@ -2536,6 +2537,7 @@ RSA_R_KEY_PRIME_NUM_INVALID:165:key prime num invalid
 RSA_R_KEY_SIZE_TOO_SMALL:120:key size too small
 RSA_R_LAST_OCTET_INVALID:134:last octet invalid
 RSA_R_MGF1_DIGEST_NOT_ALLOWED:152:mgf1 digest not allowed
+RSA_R_MISSING_PRIVATE_KEY:179:missing private key
 RSA_R_MODULUS_TOO_LARGE:105:modulus too large
 RSA_R_MP_COEFFICIENT_NOT_INVERSE_OF_R:168:mp coefficient not inverse of r
 RSA_R_MP_EXPONENT_NOT_CONGRUENT_TO_D:169:mp exponent not congruent to d

crypto/rsa/rsa_err.c

@@ -174,6 +174,8 @@ static const ERR_STRING_DATA RSA_str_reasons[] = {
     {ERR_PACK(ERR_LIB_RSA, 0, RSA_R_LAST_OCTET_INVALID), "last octet invalid"},
     {ERR_PACK(ERR_LIB_RSA, 0, RSA_R_MGF1_DIGEST_NOT_ALLOWED),
     "mgf1 digest not allowed"},
+    {ERR_PACK(ERR_LIB_RSA, 0, RSA_R_MISSING_PRIVATE_KEY),
+    "missing private key"},
     {ERR_PACK(ERR_LIB_RSA, 0, RSA_R_MODULUS_TOO_LARGE), "modulus too large"},
     {ERR_PACK(ERR_LIB_RSA, 0, RSA_R_MP_COEFFICIENT_NOT_INVERSE_OF_R),
     "mp coefficient not inverse of r"},

crypto/rsa/rsa_ossl.c

@@ -321,6 +321,11 @@ static int rsa_ossl_private_encrypt(int flen, const unsigned char *from,
             RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
             goto err;
         }
+        if (rsa->d == NULL) {
+            RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_MISSING_PRIVATE_KEY);
+            BN_free(d);
+            goto err;
+        }
         BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
 
         if (!rsa->meth->bn_mod_exp(ret, f, d, rsa->n, ctx,
@@ -438,6 +443,11 @@ static int rsa_ossl_private_decrypt(int flen, const unsigned char *from,
             RSAerr(RSA_F_RSA_OSSL_PRIVATE_DECRYPT, ERR_R_MALLOC_FAILURE);
             goto err;
         }
+        if (rsa->d == NULL) {
+            RSAerr(RSA_F_RSA_OSSL_PRIVATE_DECRYPT, RSA_R_MISSING_PRIVATE_KEY);
+            BN_free(d);
+            goto err;
+        }
         BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
 
         if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)

include/openssl/dsaerr.h

@@ -61,6 +61,7 @@ int ERR_load_DSA_strings(void);
 #  define DSA_R_INVALID_DIGEST_TYPE                        106
 #  define DSA_R_INVALID_PARAMETERS                         112
 #  define DSA_R_MISSING_PARAMETERS                         101
+#  define DSA_R_MISSING_PRIVATE_KEY                        111
 #  define DSA_R_MODULUS_TOO_LARGE                          103
 #  define DSA_R_NO_PARAMETERS_SET                          107
 #  define DSA_R_PARAMETER_ENCODING_ERROR                   105

include/openssl/rsaerr.h

@@ -130,6 +130,7 @@ int ERR_load_RSA_strings(void);
 # define RSA_R_KEY_PRIME_NUM_INVALID                      165
 # define RSA_R_KEY_SIZE_TOO_SMALL                         120
 # define RSA_R_LAST_OCTET_INVALID                         134
+# define RSA_R_MISSING_PRIVATE_KEY                        179
 # define RSA_R_MGF1_DIGEST_NOT_ALLOWED                    152
 # define RSA_R_MODULUS_TOO_LARGE                          105
 # define RSA_R_MP_COEFFICIENT_NOT_INVERSE_OF_R            168