PR Review

1. Add better error checking to the OpenSSH key code.
2. Add a couple heaps that were missing.

src/internal.c

@@ -897,7 +897,7 @@ static int wolfSSH_KEY_init(WS_KeySignature* key, byte keyId, void* heap)
         switch (keyId) {
 #ifndef WOLFSSH_NO_RSA
             case ID_SSH_RSA:
-                ret = wc_InitRsaKey(&key->ks.rsa.key, NULL);
+                ret = wc_InitRsaKey(&key->ks.rsa.key, heap);
                 break;
 #endif
 #ifndef WOLFSSH_NO_ECDSA
@@ -1045,39 +1045,84 @@ int IdentifyAsn1Key(const byte* in, word32 inSz, int isPrivate, void* heap)
 }
 
 
-static int GetOpenSshKeyRsa(RsaKey* key,
+/*
+ * Utility function to read an Mpint from the stream directly into a mp_int.
+ */
+static INLINE int GetMpintToMp(mp_int* mp,
         const byte* buf, word32 len, word32* idx)
 {
     const byte* val = NULL;
     word32 valSz = 0;
-    mp_int m;
+    int ret;
 
-    GetMpint(&valSz, &val, buf, len, idx); /* n */
-    mp_read_unsigned_bin(&key->n, val, valSz);
-    GetMpint(&valSz, &val, buf, len, idx); /* e */
-    mp_read_unsigned_bin(&key->e, val, valSz);
-    GetMpint(&valSz, &val, buf, len, idx); /* d */
-    mp_read_unsigned_bin(&key->d, val, valSz);
-    GetMpint(&valSz, &val, buf, len, idx); /* iqmp */
-    mp_read_unsigned_bin(&key->u, val, valSz);
-    GetMpint(&valSz, &val, buf, len, idx); /* p */
-    mp_read_unsigned_bin(&key->p, val, valSz);
-    GetMpint(&valSz, &val, buf, len, idx); /* q */
-    mp_read_unsigned_bin(&key->q, val, valSz);
+    ret = GetMpint(&valSz, &val, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = mp_read_unsigned_bin(mp, val, valSz);
 
-    /* Calculate dP and dQ for wolfCrypt. */
-    mp_init(&m);
-    mp_sub_d(&key->p, 1, &m);
-    mp_mod(&key->d, &m, &key->dP);
-    mp_sub_d(&key->q, 1, &m);
-    mp_mod(&key->d, &m, &key->dQ);
-    mp_forcezero(&m);
-    mp_free(&m);
-
-    return 0;
+    return ret;
 }
 
 
+/*
+ * For the given RSA key, calculate p^-1 and q^-1. wolfCrypt's RSA
+ * code expects them, but the OpenSSH format key doesn't store them.
+ * TODO: Add a RSA read function to wolfCrypt to handle this condition.
+ */
+static INLINE int CalcRsaInverses(RsaKey* key)
+{
+    mp_int m;
+    int ret;
+
+    ret = mp_init(&m);
+    if (ret == MP_OKAY) {
+        ret = mp_sub_d(&key->p, 1, &m);
+        if (ret == MP_OKAY)
+            ret = mp_mod(&key->d, &m, &key->dP);
+        if (ret == MP_OKAY)
+            ret = mp_sub_d(&key->q, 1, &m);
+        if (ret == MP_OKAY)
+            ret = mp_mod(&key->d, &m, &key->dQ);
+        mp_forcezero(&m);
+    }
+
+    return ret;
+}
+
+
+/*
+ * Utility for GetOpenSshKey() to read in RSA keys.
+ */
+static int GetOpenSshKeyRsa(RsaKey* key,
+        const byte* buf, word32 len, word32* idx)
+{
+    int ret;
+
+    ret = GetMpintToMp(&key->n, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = GetMpintToMp(&key->e, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = GetMpintToMp(&key->d, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = GetMpintToMp(&key->u, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = GetMpintToMp(&key->p, buf, len, idx);
+    if (ret == WS_SUCCESS)
+        ret = GetMpintToMp(&key->q, buf, len, idx);
+
+    /* Calculate dP and dQ for wolfCrypt. */
+    if (ret == WS_SUCCESS)
+        ret = CalcRsaInverses(key);
+
+    if (ret != WS_SUCCESS)
+        ret = WS_RSA_E;
+
+    return ret;
+}
+
+
+/*
+ * Utility for GetOpenSshKey() to read in ECDSA keys.
+ */
 static int GetOpenSshKeyEcc(ecc_key* key,
         const byte* buf, word32 len, word32* idx)
 {
@@ -1085,18 +1130,26 @@ static int GetOpenSshKeyEcc(ecc_key* key,
     word32 nameSz = 0, privSz = 0, pubSz = 0;
     int ret;
 
-    GetStringRef(&nameSz, &name, buf, len, idx); /* curve name */
-    GetStringRef(&pubSz, &pub, buf, len, idx); /* Q */
-    GetMpint(&privSz, &priv, buf, len, idx); /* d */
+    ret = GetStringRef(&nameSz, &name, buf, len, idx); /* curve name */
+    if (ret == WS_SUCCESS)
+        ret = GetStringRef(&pubSz, &pub, buf, len, idx); /* Q */
+    if (ret == WS_SUCCESS)
+        ret = GetMpint(&privSz, &priv, buf, len, idx); /* d */
 
-    ret = wc_ecc_import_private_key_ex(priv, privSz, pub, pubSz,
-            key, ECC_CURVE_DEF);
+    if (ret == WS_SUCCESS)
+        ret = wc_ecc_import_private_key_ex(priv, privSz, pub, pubSz,
+                key, ECC_CURVE_DEF);
 
-    return ret != 0;
+    if (ret != WS_SUCCESS)
+        ret = WS_ECC_E;
+
+    return ret;
 }
 
 
-
+/*
+ * Decodes an OpenSSH format key.
+ */
 static int GetOpenSshKey(WS_KeySignature *key,
         const byte* buf, word32 len, word32* idx)
 {
@@ -1155,17 +1208,19 @@ static int GetOpenSshKey(WS_KeySignature *key,
                             str, strSz, &subIdx);
                     if (ret == WS_SUCCESS) {
                         keyId = NameToId((const char*)subStr, subStrSz);
-                        wolfSSH_KEY_init(key, keyId, NULL);
+                        ret = wolfSSH_KEY_init(key, keyId, NULL);
+                    }
+                    if (ret == WS_SUCCESS) {
                         switch (keyId) {
                         #ifndef WOLFSSH_NO_RSA
                             case ID_SSH_RSA:
-                                GetOpenSshKeyRsa(&key->ks.rsa.key,
+                                ret = GetOpenSshKeyRsa(&key->ks.rsa.key,
                                         str, strSz, &subIdx);
                                 break;
                         #endif
                         #ifndef WOLFSSH_NO_ECDSA
                             case ID_ECDSA_SHA2_NISTP256:
-                                GetOpenSshKeyEcc(&key->ks.ecc.key,
+                                ret = GetOpenSshKeyEcc(&key->ks.ecc.key,
                                         str, strSz, &subIdx);
                                 break;
                         #endif