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openssl/crypto/asn1/x_name.c

Index: openssl/crypto/asn1/x_name.c
===================================================================
--- openssl/crypto/asn1/x_name.c	(revision 105093)
+++ openssl/crypto/asn1/x_name.c	(working copy)
@@ -57,19 +57,37 @@
  */
 
 #include <stdio.h>
+#include <ctype.h>
 #include "cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
+#include "asn1_locl.h"
 
-static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_ITEM *it,
-					int tag, int aclass, char opt, ASN1_TLC *ctx);
+typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
+DECLARE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
 
-static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
+static int x509_name_ex_d2i(ASN1_VALUE **val,
+				const unsigned char **in, long len,
+				const ASN1_ITEM *it,
+				int tag, int aclass, char opt, ASN1_TLC *ctx);
+
+static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
+				const ASN1_ITEM *it, int tag, int aclass);
 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
 
 static int x509_name_encode(X509_NAME *a);
+static int x509_name_canon(X509_NAME *a);
+static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
+static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname,
+			  unsigned char **in);
 
+
+static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
+						int indent,
+						const char *fname, 
+						const ASN1_PCTX *pctx);
+
 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
 	ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
 	ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
@@ -102,7 +120,8 @@
 	x509_name_ex_free,
 	0,	/* Default clear behaviour is OK */
 	x509_name_ex_d2i,
-	x509_name_ex_i2d
+	x509_name_ex_i2d,
+	x509_name_ex_print
 };
 
 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff) 
@@ -118,6 +137,8 @@
 	if ((ret->entries=sk_X509_NAME_ENTRY_new_null()) == NULL)
 		goto memerr;
 	if((ret->bytes = BUF_MEM_new()) == NULL) goto memerr;
+	ret->canon_enc = NULL;
+	ret->canon_enclen = 0;
 	ret->modified=1;
 	*val = (ASN1_VALUE *)ret;
 	return 1;
@@ -142,25 +163,19 @@
 
 	BUF_MEM_free(a->bytes);
 	sk_X509_NAME_ENTRY_pop_free(a->entries,X509_NAME_ENTRY_free);
+	if (a->canon_enc)
+		OPENSSL_free(a->canon_enc);
 	OPENSSL_free(a);
 	*pval = NULL;
 }
 
-/* Used with sk_pop_free() to free up the internal representation.
- * NB: we only free the STACK and not its contents because it is
- * already present in the X509_NAME structure.
- */
-
-static void sk_internal_free(void *a)
+static int x509_name_ex_d2i(ASN1_VALUE **val,
+			const unsigned char **in, long len, const ASN1_ITEM *it,
+				int tag, int aclass, char opt, ASN1_TLC *ctx)
 {
-	sk_free(a);
-}
-
-static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long len, const ASN1_ITEM *it,
-					int tag, int aclass, char opt, ASN1_TLC *ctx)
-{
 	const unsigned char *p = *in, *q;
-	union { STACK *s; ASN1_VALUE *a; } intname = {NULL};
+	union { STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
+		ASN1_VALUE *a; } intname = {NULL};
 	union { X509_NAME *x; ASN1_VALUE *a; } nm = {NULL};
 	int i, j, ret;
 	STACK_OF(X509_NAME_ENTRY) *entries;
@@ -181,8 +196,8 @@
 	memcpy(nm.x->bytes->data, q, p - q);
 
 	/* Convert internal representation to X509_NAME structure */
-	for(i = 0; i < sk_num(intname.s); i++) {
-		entries = (STACK_OF(X509_NAME_ENTRY) *)sk_value(intname.s, i);
+	for(i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
+		entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
 		for(j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
 			entry = sk_X509_NAME_ENTRY_value(entries, j);
 			entry->set = i;
@@ -191,12 +206,17 @@
 		}
 		sk_X509_NAME_ENTRY_free(entries);
 	}
-	sk_free(intname.s);
+	sk_STACK_OF_X509_NAME_ENTRY_free(intname.s);
+	ret = x509_name_canon(nm.x);
+	if (!ret)
+		goto err;
 	nm.x->modified = 0;
 	*val = nm.a;
 	*in = p;
 	return ret;
-	err:
+err:
+        if (nm.x != NULL)
+		X509_NAME_free(nm.x);
 	ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
 	return 0;
 }
@@ -206,8 +226,12 @@
 	int ret;
 	X509_NAME *a = (X509_NAME *)*val;
 	if(a->modified) {
-		ret = x509_name_encode((X509_NAME *)a);
-		if(ret < 0) return ret;
+		ret = x509_name_encode(a);
+		if(ret < 0)
+			return ret;
+		ret = x509_name_canon(a);
+		if(ret < 0)
+			return ret;
 	}
 	ret = a->bytes->length;
 	if(out != NULL) {
@@ -217,22 +241,35 @@
 	return ret;
 }
 
+static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
+	{
+	sk_X509_NAME_ENTRY_free(ne);
+	}
+
+static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
+	{
+	sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
+	}
+
 static int x509_name_encode(X509_NAME *a)
 {
-	union { STACK *s; ASN1_VALUE *a; } intname = {NULL};
+	union { STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
+		ASN1_VALUE *a; } intname = {NULL};
 	int len;
 	unsigned char *p;
 	STACK_OF(X509_NAME_ENTRY) *entries = NULL;
 	X509_NAME_ENTRY *entry;
 	int i, set = -1;
-	intname.s = sk_new_null();
+	intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
 	if(!intname.s) goto memerr;
 	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 memerr;
-			if(!sk_push(intname.s, (char *)entries)) goto memerr;
+			if(!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s,
+							     entries))
+				goto memerr;
 			set = entry->set;
 		}
 		if(!sk_X509_NAME_ENTRY_push(entries, entry)) goto memerr;
@@ -243,16 +280,224 @@
 	p=(unsigned char *)a->bytes->data;
 	ASN1_item_ex_i2d(&intname.a,
 			 &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
-	sk_pop_free(intname.s, sk_internal_free);
+	sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
+					     local_sk_X509_NAME_ENTRY_free);
 	a->modified = 0;
 	return len;
-	memerr:
-	sk_pop_free(intname.s, sk_internal_free);
+memerr:
+	sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
+					     local_sk_X509_NAME_ENTRY_free);
 	ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
 	return -1;
 }
 
+static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
+						int indent,
+						const char *fname, 
+						const ASN1_PCTX *pctx)
+	{
+	if (X509_NAME_print_ex(out, (X509_NAME *)*pval,
+					indent, pctx->nm_flags) <= 0)
+		return 0;
+	return 2;
+	}
 
+/* 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_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
+	STACK_OF(X509_NAME_ENTRY) *entries = NULL;
+	X509_NAME_ENTRY *entry, *tmpentry = NULL;
+	int i, set = -1, ret = 0;
+
+	if (a->canon_enc)
+		{
+		OPENSSL_free(a->canon_enc);
+		a->canon_enc = NULL;
+		}
+	/* Special case: empty X509_NAME => null encoding */
+	if (sk_X509_NAME_ENTRY_num(a->entries) == 0)
+		{
+		a->canon_enclen = 0;
+		return 1;
+		}
+	intname = sk_STACK_OF_X509_NAME_ENTRY_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_STACK_OF_X509_NAME_ENTRY_push(intname, 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_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
+					local_sk_X509_NAME_ENTRY_pop_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;
+		return 1;
+		}
+
+	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++;
+			i++;
+			}
+		/* 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);
+			from++;
+			i++;
+			}
+		}
+
+	out->length = to - out->data;
+
+	return 1;
+
+	}
+
+static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *_intname,
+			  unsigned char **in)
+	{
+	int i, len, ltmp;
+	ASN1_VALUE *v;
+	STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
+
+	len = 0;
+	for (i = 0; i < sk_ASN1_VALUE_num(intname); i++)
+		{
+		v = sk_ASN1_VALUE_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;
+	}
+
 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
 	{
 	X509_NAME *in;