New function ASN1_mbstring_copy() to handle ASN1 string copying. Ultimately

this will be used to clear up the horrible DN mess.

1 files changed, 352 insertions, 0 deletions

diff --git a/crypto/asn1/a_mbstr.c b/crypto/asn1/a_mbstr.c
new file mode 100644
index 0000000000..b83e3ee35e
--- /dev/null
+++ b/crypto/asn1/a_mbstr.c
@@ -0,0 +1,352 @@
+/* a_mbstr.c */
+/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+ * project 1999.
+ */
+/* ====================================================================
+ * Copyright (c) 1999 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
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/asn1.h>
+
+static int traverse_string(unsigned char *p, int len, int inform,
+		 int (*rfunc)(unsigned long value, void *in), void *arg);
+static int in_utf8(unsigned long value, void *arg);
+static int out_utf8(unsigned long value, void *arg);
+static int type_str(unsigned long value, void *arg);
+static int cpy_asc(unsigned long value, void *arg);
+static int cpy_bmp(unsigned long value, void *arg);
+static int cpy_univ(unsigned long value, void *arg);
+static int cpy_utf8(unsigned long value, void *arg);
+static int is_printable(unsigned long value);
+
+/* This function takes a string in UTF8, ASCII or multibyte form and
+ * a mask of permissible ASN1 string types. It then works out the minimal
+ * type (using the order Printable < IA5 < T61 < BMP < Universal < UTF8)
+ * and creates a string of the correct type with the supplied data.
+ * Yes this is horrible: it has to be :-(
+ */
+
+int ASN1_mbstring_copy(ASN1_STRING **out, unsigned char *in, int len,
+					int inform, unsigned long mask)
+{
+	int str_type;
+	int ret;
+	int outform, outlen;
+	ASN1_STRING *dest;
+	unsigned char *p;
+	int nchar;
+	int (*cpyfunc)(unsigned long value, void *in) = NULL;
+	if(len == -1) len = strlen(in);
+
+	/* First do a string check and work out the number of characters */
+	switch(inform) {
+
+		case MBSTRING_BMP:
+		if(len & 1) {
+			ASN1err(ASN1_F_ASN1_MBSTRING_COPY,
+					 ASN1_R_INVALID_BMPSTRING_LENGTH);
+			return -1;
+		}
+		nchar = len >> 1;
+		break;
+
+		case MBSTRING_UNIV:
+		if(len & 3) {
+			ASN1err(ASN1_F_ASN1_MBSTRING_COPY,
+					 ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
+			return -1;
+		}
+		nchar = len >> 2;
+		break;
+
+		case MBSTRING_UTF8:
+		nchar = 0;
+		ret = traverse_string(in, len, MBSTRING_UTF8, in_utf8, &nchar);
+		if(ret < 0) {
+			ASN1err(ASN1_F_ASN1_MBSTRING_COPY,
+						 ASN1_R_INVALID_UTF8STRING);
+			return -1;
+		}
+		break;
+
+		case MBSTRING_ASC:
+		nchar = len;
+		break;
+
+		default:
+		ASN1err(ASN1_F_ASN1_MBSTRING_COPY, ASN1_R_UNKNOWN_FORMAT);
+		return -1;
+	}
+
+	/* Now work out minimal type (if any) */
+	if(traverse_string(in, len, inform, type_str, &mask) < 0) {
+		ASN1err(ASN1_F_ASN1_MBSTRING_COPY, ASN1_R_ILLEGAL_CHARACTERS);
+		return -1;
+	}
+
+	/* Now work out output format and string type */
+	outform = MBSTRING_ASC;
+	if(mask & B_ASN1_PRINTABLESTRING) str_type = V_ASN1_PRINTABLESTRING;
+	else if(mask & B_ASN1_IA5STRING) str_type = V_ASN1_IA5STRING;
+	else if(mask & B_ASN1_T61STRING) str_type = V_ASN1_T61STRING;
+	else if(mask & B_ASN1_BMPSTRING) {
+		str_type = V_ASN1_BMPSTRING;
+		outform = MBSTRING_BMP;
+	} else if(mask & B_ASN1_UNIVERSALSTRING) {
+		str_type = V_ASN1_UNIVERSALSTRING;
+		outform = MBSTRING_UNIV;
+	} else {
+		str_type = V_ASN1_UTF8STRING;
+		outform = MBSTRING_UTF8;
+	}
+	if(!out) return str_type;
+	if(!(dest = ASN1_STRING_type_new(str_type))) {
+		ASN1err(ASN1_F_ASN1_MBSTRING_COPY, ERR_R_MALLOC_FAILURE);
+		return -1;
+	}
+	*out = dest;
+	/* If both the same type just copy across */
+	if(inform == outform) {
+		if(!ASN1_STRING_set(dest, in, len)) {
+			ASN1_STRING_free(dest);
+			ASN1err(ASN1_F_ASN1_MBSTRING_COPY,ERR_R_MALLOC_FAILURE);
+			return -1;
+		}
+		return str_type;
+	} 
+
+	/* Work out how much space the destination will need */
+	switch(outform) {
+		case MBSTRING_ASC:
+		outlen = nchar;
+		cpyfunc = cpy_asc;
+		break;
+
+		case MBSTRING_BMP:
+		outlen = nchar << 1;
+		cpyfunc = cpy_bmp;
+		break;
+
+		case MBSTRING_UNIV:
+		outlen = nchar << 2;
+		cpyfunc = cpy_univ;
+		break;
+
+		case MBSTRING_UTF8:
+		outlen = 0;
+		traverse_string(in, len, inform, out_utf8, &outlen);
+		cpyfunc = cpy_utf8;
+		break;
+	}
+	if(!(p = Malloc(outlen + 1))) {
+		ASN1_STRING_free(dest);
+		ASN1err(ASN1_F_ASN1_MBSTRING_COPY,ERR_R_MALLOC_FAILURE);
+		return -1;
+	}
+	dest->length = outlen;
+	dest->data = p;
+	p[outlen] = 0;
+	traverse_string(in, len, inform, cpyfunc, &p);
+	return str_type;	
+}
+
+/* This function traverses a string and passes the value of each character
+ * to an optional function along with a void * argument.
+ */
+
+static int traverse_string(unsigned char *p, int len, int inform,
+		 int (*rfunc)(unsigned long value, void *in), void *arg)
+{
+	unsigned long value;
+	int ret;
+	while(len) {
+		if(inform == MBSTRING_ASC) {
+			value = *p++;
+			len--;
+		} else if(inform == MBSTRING_BMP) {
+			value = *p++ << 8;
+			value |= *p++;
+			len -= 2;
+		} else if(inform == MBSTRING_UNIV) {
+			value = *p++ << 24;
+			value |= *p++ << 16;
+			value |= *p++ << 8;
+			value |= *p++;
+			len -= 4;
+		} else {
+			ret = UTF8_getc(p, len, &value);
+			if(ret < 0) return -1;
+			len -= ret;
+			p += ret;
+		}
+		if(rfunc) {
+			ret = rfunc(value, arg);
+			if(ret <= 0) return ret;
+		}
+	}
+	return 1;
+}
+
+/* Various utility functions for traverse_string */
+
+/* Just count number of characters */
+
+static int in_utf8(unsigned long value, void *arg)
+{
+	int *nchar;
+	nchar = arg;
+	(*nchar)++;
+	return 1;
+}
+
+/* Determine size of output as a UTF8 String */
+
+static int out_utf8(unsigned long value, void *arg)
+{
+	long *outlen;
+	outlen = arg;
+	*outlen += UTF8_putc(NULL, -1, value);
+	return 1;
+}
+
+/* Determine the "type" of a string: check each character against a
+ * supplied "mask".
+ */
+
+static int type_str(unsigned long value, void *arg)
+{
+	unsigned long types;
+	types = *((unsigned long *)arg);
+	if((types & B_ASN1_PRINTABLESTRING) && !is_printable(value))
+					types &= ~B_ASN1_PRINTABLESTRING;
+	if((types & B_ASN1_IA5STRING) && (value > 127))
+					types &= ~B_ASN1_IA5STRING;
+	if((types & B_ASN1_T61STRING) && (value > 0xff))
+					types &= ~B_ASN1_T61STRING;
+	if((types & B_ASN1_BMPSTRING) && (value > 0xffff))
+					types &= ~B_ASN1_BMPSTRING;
+	if(!types) return -1;
+	*((unsigned long *)arg) = types;
+	return 1;
+}
+
+/* Copy one byte per character ASCII like strings */
+
+static int cpy_asc(unsigned long value, void *arg)
+{
+	unsigned char **p, *q;
+	p = arg;
+	q = *p;
+	*q = (unsigned char) value;
+	(*p)++;
+	return 1;
+}
+
+/* Copy two byte per character BMPStrings */
+
+static int cpy_bmp(unsigned long value, void *arg)
+{
+	unsigned char **p, *q;
+	p = arg;
+	q = *p;
+	*q++ = (unsigned char) ((value >> 8) & 0xff);
+	*q = (unsigned char) (value & 0xff);
+	*p += 2;
+	return 1;
+}
+
+/* Copy four byte per character UniversalStrings */
+
+static int cpy_univ(unsigned long value, void *arg)
+{
+	unsigned char **p, *q;
+	p = arg;
+	q = *p;
+	*q++ = (unsigned char) ((value >> 24) & 0xff);
+	*q++ = (unsigned char) ((value >> 16) & 0xff);
+	*q++ = (unsigned char) ((value >> 8) & 0xff);
+	*q = (unsigned char) (value & 0xff);
+	*p += 4;
+	return 1;
+}
+
+/* Copy to a UTF8String */
+
+static int cpy_utf8(unsigned long value, void *arg)
+{
+	unsigned char **p;
+	int ret;
+	p = arg;
+	/* We already know there is enough room so pass 0xff as the length */
+	ret = UTF8_putc(*p, 0xff, value);
+	*p += ret;
+	return 1;
+}
+
+/* Return 1 if the character is permitted in a PrintableString */
+static int is_printable(unsigned long value)
+{
+	int ch;
+	if(value > 0x7f) return 0;
+	ch = (int) value;
+	/* Note: we can't use 'isalnum' because certain accented 
+	 * characters may count as alphanumeric in some environments.
+	 */
+	if((ch >= 'a') && (ch <= 'z')) return 1;
+	if((ch >= 'A') && (ch <= 'Z')) return 1;
+	if((ch >= '0') && (ch <= '9')) return 1;
+	if ((ch == ' ') || strchr("'()+,-./:=?", ch)) return 1;
+	return 0;
+}