+/* This function generates the canonical encoding of the Name structure.
+ * In it all strings are converted to UTF8, leading, trailing and
+ * multiple spaces collapsed, converted to lower case and the leading
+ * SEQUENCE header removed.
+ *
+ * In future we could also normalize the UTF8 too.
+ *
+ * By doing this comparison of Name structures can be rapidly
+ * perfomed by just using memcmp() of the canonical encoding.
+ * By omitting the leading SEQUENCE name constraints of type
+ * dirName can also be checked with a simple memcmp().
+ */
+
+static int x509_name_canon(X509_NAME *a)
+ {
+ unsigned char *p;
+ STACK *intname = NULL;
+ STACK_OF(X509_NAME_ENTRY) *entries = NULL;
+ X509_NAME_ENTRY *entry, *tmpentry;
+ int i, set = -1, ret = 0;
+ if (a->canon_enc)
+ {
+ OPENSSL_free(a->canon_enc);
+ a->canon_enc = NULL;
+ }
+ intname = sk_new_null();
+ if(!intname)
+ goto err;
+ for(i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++)
+ {
+ entry = sk_X509_NAME_ENTRY_value(a->entries, i);
+ if(entry->set != set)
+ {
+ entries = sk_X509_NAME_ENTRY_new_null();
+ if(!entries)
+ goto err;
+ if(!sk_push(intname, (char *)entries))
+ goto err;
+ set = entry->set;
+ }
+ tmpentry = X509_NAME_ENTRY_new();
+ tmpentry->object = OBJ_dup(entry->object);
+ if (!asn1_string_canon(tmpentry->value, entry->value))
+ goto err;
+ if(!sk_X509_NAME_ENTRY_push(entries, tmpentry))
+ goto err;
+ tmpentry = NULL;
+ }
+
+ /* Finally generate encoding */
+
+ a->canon_enclen = i2d_name_canon(intname, NULL);
+
+ p = OPENSSL_malloc(a->canon_enclen);
+
+ if (!p)
+ goto err;
+
+ a->canon_enc = p;
+
+ i2d_name_canon(intname, &p);
+
+ ret = 1;
+
+ err:
+
+ if (tmpentry)
+ X509_NAME_ENTRY_free(tmpentry);
+ if (intname)
+ sk_pop_free(intname, canon_free);
+ return ret;
+ }
+
+/* Bitmap of all the types of string that will be canonicalized. */
+
+#define ASN1_MASK_CANON \
+ (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
+ | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
+ | B_ASN1_VISIBLESTRING)
+
+
+static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
+ {
+ unsigned char *to, *from;
+ int len, i;
+
+ /* If type not in bitmask just copy string across */
+ if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON))
+ {
+ out->type = in->type;
+ if (!ASN1_STRING_set(out, in->data, in->length))
+ return 0;
+ }
+
+ out->type = V_ASN1_UTF8STRING;
+ out->length = ASN1_STRING_to_UTF8(&out->data, in);
+ if (out->length == -1)
+ return 0;
+
+ to = out->data;
+ from = to;
+
+ len = out->length;
+
+ /* Convert string in place to canonical form.
+ * Ultimately we may need to handle a wider range of characters
+ * but for now ignore anything with MSB set and rely on the
+ * isspace() and tolower() functions.
+ */
+
+ /* Ignore leading spaces */
+ while((len > 0) && !(*from & 0x80) && isspace(*from))
+ {
+ from++;
+ len--;
+ }
+
+ to = from + len - 1;
+
+ /* Ignore trailing spaces */
+ while ((len > 0) && !(*to & 0x80) && isspace(*to))
+ {
+ to--;
+ len--;
+ }
+
+ to = out->data;
+
+ i = 0;
+ while(i < len)
+ {
+ /* If MSB set just copy across */
+ if (*from & 0x80)
+ *to++ = *from++;
+ /* Collapse multiple spaces */
+ else if (isspace(*from))
+ {
+ /* Copy one space across */
+ *to++ = ' ';
+ /* Ignore subsequent spaces. Note: don't need to
+ * check len here because we know the last
+ * character is a non-space so we can't overflow.
+ */
+ do
+ {
+ from++;
+ i++;
+ }
+ while(!(*from & 0x80) && isspace(*from));
+ }
+ else
+ {
+ *to++ = tolower(*from++);
+ i++;
+ }
+ }
+
+ out->length = to - out->data;
+
+ return 1;
+
+ }
+
+static int i2d_name_canon(STACK *intname, unsigned char **in)
+ {
+ int i, len, ltmp;
+ ASN1_VALUE *v;
+ len = 0;
+ for (i = 0; i < sk_num(intname); i++)
+ {
+ v = (ASN1_VALUE *)sk_value(intname, i);
+ ltmp = ASN1_item_ex_i2d(&v, in,
+ ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
+ if (ltmp < 0)
+ return ltmp;
+ len += ltmp;
+ }
+ return len;
+ }
projects / openssl.git / commitdiff