IPv6 display and input support for extensions usingh GeneralName.

CHANGES

@@ -4,6 +4,12 @@
 
  Changes between 0.9.7 and 0.9.8  [xx XXX xxxx]
 
+  *) IPv6 support for certificate extensions. The various extensions
+     which use the IP:a.b.c.d can now take IPv6 addresses using the
+     formats of RFC1884 2.2 . IPv6 addresses are now also displayed
+     correctly.
+     [Steve Henson]
+
   *) Added an ENGINE that implements RSA by performing private key
      exponentiations with the GMP library. The conversions to and from
      GMP's mpz_t format aren't optimised nor are any montgomery forms

crypto/x509v3/v3_alt.c

 /* v3_alt.c */
 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 1999.
+ * project.
  */
 /* ====================================================================
- * Copyright (c) 1999-2002 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1999-2003 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -100,7 +100,8 @@ STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(X509V3_EXT_METHOD *method,
 				GENERAL_NAME *gen, STACK_OF(CONF_VALUE) *ret)
 {
 	unsigned char *p;
-	char oline[256];
+	char oline[256], htmp[5];
+	int i;
 	switch (gen->type)
 	{
 		case GEN_OTHERNAME:
@@ -134,12 +135,25 @@ STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(X509V3_EXT_METHOD *method,
 
 		case GEN_IPADD:
 		p = gen->d.ip->data;
-		/* BUG: doesn't support IPV6 */
-		if(gen->d.ip->length != 4) {
+		if(gen->d.ip->length == 4)
+			sprintf(oline, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+		else if(gen->d.ip->length == 16)
+			{
+			oline[0] = 0;
+			for (i = 0; i < 8; i++)
+				{
+				sprintf(htmp, "%X", p[0] << 8 | p[1]);
+				p += 2;
+				strcat(oline, htmp);
+				if (i != 7)
+					strcat(oline, ":");
+				}
+			}
+		else
+			{
 			X509V3_add_value("IP Address","<invalid>", &ret);
 			break;
-		}
-		sprintf(oline, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+			}
 		X509V3_add_value("IP Address",oline, &ret);
 		break;
 
@@ -154,6 +168,7 @@ STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(X509V3_EXT_METHOD *method,
 int GENERAL_NAME_print(BIO *out, GENERAL_NAME *gen)
 {
 	unsigned char *p;
+	int i;
 	switch (gen->type)
 	{
 		case GEN_OTHERNAME:
@@ -188,12 +203,24 @@ int GENERAL_NAME_print(BIO *out, GENERAL_NAME *gen)
 
 		case GEN_IPADD:
 		p = gen->d.ip->data;
-		/* BUG: doesn't support IPV6 */
-		if(gen->d.ip->length != 4) {
+		if(gen->d.ip->length == 4)
+			BIO_printf(out, "IP Address:%d.%d.%d.%d",
+						p[0], p[1], p[2], p[3]);
+		else if(gen->d.ip->length == 16)
+			{
+			BIO_printf(out, "IP Address");
+			for (i = 0; i < 8; i++)
+				{
+				BIO_printf(out, ":%X", p[0] << 8 | p[1]);
+				p += 2;
+				}
+			BIO_puts(out, "\n");
+			}
+		else
+			{
 			BIO_printf(out,"IP Address:<invalid>");
 			break;
-		}
-		BIO_printf(out, "IP Address:%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+			}
 		break;
 
 		case GEN_RID:
@@ -418,21 +445,12 @@ if(!name_cmp(name, "email")) {
 	gen->d.rid = obj;
 	type = GEN_RID;
 } else if(!name_cmp(name, "IP")) {
-	int i1,i2,i3,i4;
-	unsigned char ip[4];
-	if((sscanf(value, "%d.%d.%d.%d",&i1,&i2,&i3,&i4) != 4) ||
-	    (i1 < 0) || (i1 > 255) || (i2 < 0) || (i2 > 255) ||
-	    (i3 < 0) || (i3 > 255) || (i4 < 0) || (i4 > 255) ) {
+	if(!(gen->d.ip = a2i_IPADDRESS(value)))
+		{
 		X509V3err(X509V3_F_V2I_GENERAL_NAME,X509V3_R_BAD_IP_ADDRESS);
 		ERR_add_error_data(2, "value=", value);
 		goto err;
-	}
-	ip[0] = i1; ip[1] = i2 ; ip[2] = i3 ; ip[3] = i4;
-	if(!(gen->d.ip = M_ASN1_OCTET_STRING_new()) ||
-		!ASN1_STRING_set(gen->d.ip, ip, 4)) {
-			X509V3err(X509V3_F_V2I_GENERAL_NAME,ERR_R_MALLOC_FAILURE);
-			goto err;
-	}
+		}
 	type = GEN_IPADD;
 } else if(!name_cmp(name, "otherName")) {
 	if (!do_othername(gen, value, ctx))

crypto/x509v3/v3_utl.c

 /* v3_utl.c */
 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 1999.
+ * project.
  */
 /* ====================================================================
- * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1999-2003 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -70,6 +70,11 @@ static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens);
 static void str_free(void *str);
 static int append_ia5(STACK **sk, ASN1_IA5STRING *email);
 
+static int ipv4_from_asc(unsigned char *v4, const char *in);
+static int ipv6_from_asc(unsigned char *v6, const char *in);
+static int ipv6_cb(const char *elem, int len, void *usr);
+static int ipv6_hex(unsigned char *out, const char *in, int inlen);
+
 /* Add a CONF_VALUE name value pair to stack */
 
 int X509V3_add_value(const char *name, const char *value,
@@ -534,3 +539,204 @@ void X509_email_free(STACK *sk)
 {
 	sk_pop_free(sk, str_free);
 }
+
+/* Convert IP addresses both IPv4 and IPv6 into an 
+ * OCTET STRING compatible with RFC3280.
+ */
+
+ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
+	{
+	unsigned char ipout[16];
+	ASN1_OCTET_STRING *ret;
+	int iplen;
+
+	/* If string contains a ':' assume IPv6 */
+
+	if (strchr(ipasc, ':'))
+		{
+		if (!ipv6_from_asc(ipout, ipasc))
+			return NULL;
+		iplen = 16;
+		}
+	else
+		{
+		if (!ipv4_from_asc(ipout, ipasc))
+			return NULL;
+		iplen = 4;
+		}
+
+	ret = ASN1_OCTET_STRING_new();
+	if (!ret)
+		return NULL;
+	if (!ASN1_OCTET_STRING_set(ret, ipout, iplen))
+		{
+		ASN1_OCTET_STRING_free(ret);
+		return NULL;
+		}
+	return ret;
+	}
+
+static int ipv4_from_asc(unsigned char *v4, const char *in)
+	{
+	int a0, a1, a2, a3;
+	if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
+		return 0;
+	if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
+		|| (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
+		return 0;
+	v4[0] = a0;
+	v4[1] = a1;
+	v4[2] = a2;
+	v4[3] = a3;
+	return 1;
+	}
+
+typedef struct {
+		/* Temporary store for IPV6 output */
+		unsigned char tmp[16];
+		/* Total number of bytes in tmp */
+		int total;
+		/* The position of a zero (corresponding to '::') */
+		int zero_pos;
+		/* Number of zeroes */
+		int zero_cnt;
+	} IPV6_STAT;
+
+
+static int ipv6_from_asc(unsigned char *v6, const char *in)
+	{
+	IPV6_STAT v6stat;
+	v6stat.total = 0;
+	v6stat.zero_pos = -1;
+	v6stat.zero_cnt = 0;
+	/* Treat the IPv6 representation as a list of values
+	 * separated by ':'. The presence of a '::' will parse
+ 	 * as one, two or three zero length elements.
+	 */
+	if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
+		return 0;
+
+	/* Now for some sanity checks */
+
+	if (v6stat.zero_pos == -1)
+		{
+		/* If no '::' must have exactly 16 bytes */
+		if (v6stat.total != 16)
+			return 0;
+		}
+	else 
+		{
+		/* If '::' must have less than 16 bytes */
+		if (v6stat.total == 16)
+			return 0;
+		/* More than three zeroes is an error */
+		if (v6stat.zero_cnt > 3)
+			return 0;
+		/* Can only have three zeroes if nothing else present */
+		else if (v6stat.zero_cnt == 3)
+			{
+			if (v6stat.total > 0)
+				return 0;
+			}
+		/* Can only have two zeroes if at start or end */
+		else if (v6stat.zero_cnt == 2)
+			{
+			if ((v6stat.zero_pos != 0)
+				&& (v6stat.zero_pos != v6stat.total))
+				return 0;
+			}
+		else 
+		/* Can only have one zero if *not* start or end */
+			{
+			if ((v6stat.zero_pos == 0)
+				|| (v6stat.zero_pos == v6stat.total))
+				return 0;
+			}
+		}
+
+	/* Format result */
+
+	/* Copy initial part */
+	if (v6stat.zero_pos > 0)
+		memcpy(v6, v6stat.tmp, v6stat.zero_pos);
+	/* Zero middle */
+	if (v6stat.total != 16)
+		memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
+	/* Copy final part */
+	if (v6stat.total != v6stat.zero_pos)
+		memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
+			v6stat.tmp + v6stat.zero_pos,
+			v6stat.total - v6stat.zero_pos);
+
+	return 1;
+	}
+
+static int ipv6_cb(const char *elem, int len, void *usr)
+	{
+	IPV6_STAT *s = usr;
+	/* Error if 16 bytes written */
+	if (s->total == 16)
+		return 0;
+	if (len == 0)
+		{
+		/* Zero length element, corresponds to '::' */
+		if (s->zero_pos == -1)
+			s->zero_pos = s->total;
+		/* If we've already got a :: its an error */
+		else if (s->zero_pos != s->total)
+			return 0;
+		s->zero_cnt++;
+		}
+	else 
+		{
+		/* If more than 4 characters could be final a.b.c.d form */
+		if (len > 4)
+			{
+			/* Need at least 4 bytes left */
+			if (s->total > 12)
+				return 0;
+			/* Must be end of string */
+			if (elem[len])
+				return 0;
+			if (!ipv4_from_asc(s->tmp + s->total, elem))
+				return 0;
+			s->total += 4;
+			}
+		else
+			{
+			if (!ipv6_hex(s->tmp + s->total, elem, len))
+				return 0;
+			s->total += 2;
+			}
+		}
+	return 1;
+	}
+
+/* Convert a string of up to 4 hex digits into the corresponding
+ * IPv6 form.
+ */
+
+static int ipv6_hex(unsigned char *out, const char *in, int inlen)
+	{
+	unsigned char c;
+	unsigned int num = 0;
+	if (inlen > 4)
+		return 0;
+	while(inlen--)
+		{
+		c = *in++;
+		num <<= 4;
+		if ((c >= '0') && (c <= '9'))
+			num |= c - '0';
+		else if ((c >= 'A') && (c <= 'F'))
+			num |= c - 'A' + 10;
+		else if ((c >= 'a') && (c <= 'f'))
+			num |=  c - 'a' + 10;
+		else
+			return 0;
+		}
+	out[0] = num >> 8;
+	out[1] = num & 0xff;
+	return 1;
+	}
+

crypto/x509v3/x509v3.h

@@ -547,6 +547,7 @@ STACK *X509_get1_email(X509 *x);
 STACK *X509_REQ_get1_email(X509_REQ *x);
 void X509_email_free(STACK *sk);
 
+ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc);
 
 /* BEGIN ERROR CODES */
 /* The following lines are auto generated by the script mkerr.pl. Any changes