Update from stable branch.

[openssl.git] / crypto / asn1 / tasn_dec.c

diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c
index 6bab6d4a6f9e120072a993703492768a2e2c6b9e..3bee439968e47c3bf86023e4213789e3c7abaf52 100644 (file)
--- a/crypto/asn1/tasn_dec.c
+++ b/crypto/asn1/tasn_dec.c
@@ -69,7 +69,7 @@ static int asn1_check_eoc(const unsigned char **in, long len);
 static int asn1_find_end(const unsigned char **in, long len, char inf);
 
 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
-                               char inf, int tag, int aclass);
+                       char inf, int tag, int aclass, int depth);
 
 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
 
@@ -613,7 +613,6 @@ static int asn1_template_ex_d2i(ASN1_VALUE **val,
 
        err:
        ASN1_template_free(val, tt);
-       *val = NULL;
        return 0;
        }
 
@@ -762,7 +761,6 @@ static int asn1_template_noexp_d2i(ASN1_VALUE **val,
 
        err:
        ASN1_template_free(val, tt);
-       *val = NULL;
        return 0;
        }
 
@@ -882,7 +880,7 @@ static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
                 * internally irrespective of the type. So instead just check
                 * for UNIVERSAL class and ignore the tag.
                 */
-               if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL))
+               if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0))
                        {
                        free_cont = 1;
                        goto err;
@@ -1016,6 +1014,18 @@ int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
                case V_ASN1_SET:
                case V_ASN1_SEQUENCE:
                default:
+               if (utype == V_ASN1_BMPSTRING && (len & 1))
+                       {
+                       ASN1err(ASN1_F_ASN1_EX_C2I,
+                                       ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
+                       goto err;
+                       }
+               if (utype == V_ASN1_UNIVERSALSTRING && (len & 3))
+                       {
+                       ASN1err(ASN1_F_ASN1_EX_C2I,
+                                       ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
+                       goto err;
+                       }
                /* All based on ASN1_STRING and handled the same */
                if (!*pval)
                        {
@@ -1132,8 +1142,18 @@ static int asn1_find_end(const unsigned char **in, long len, char inf)
  * if it is indefinite length.
  */
 
+#ifndef ASN1_MAX_STRING_NEST
+/* This determines how many levels of recursion are permitted in ASN1
+ * string types. If it is not limited stack overflows can occur. If set
+ * to zero no recursion is allowed at all. Although zero should be adequate
+ * examples exist that require a value of 1. So 5 should be more than enough.
+ */
+#define ASN1_MAX_STRING_NEST 5
+#endif
+
+
 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
-                               char inf, int tag, int aclass)
+                       char inf, int tag, int aclass, int depth)
        {
        const unsigned char *p, *q;
        long plen;
@@ -1175,13 +1195,15 @@ static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
                /* If indefinite length constructed update max length */
                if (cst)
                        {
-#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
-                       if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
+                       if (depth >= ASN1_MAX_STRING_NEST)
+                               {
+                               ASN1err(ASN1_F_ASN1_COLLECT,
+                                       ASN1_R_NESTED_ASN1_STRING);
+                               return 0;
+                               }
+                       if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
+                                               depth + 1))
                                return 0;
-#else
-                       ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
-                       return 0;
-#endif
                        }
                else if (plen && !collect_data(buf, &p, plen))
                        return 0;