Initial import

1 files changed, 942 insertions, 0 deletions

diff --git a/openssl/crypto/asn1/asn_mime.c b/openssl/crypto/asn1/asn_mime.c
new file mode 100644
index 00000000..c1d1b122
--- /dev/null
+++ b/openssl/crypto/asn1/asn_mime.c
@@ -0,0 +1,942 @@
+/* asn_mime.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2008 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.
+ * ====================================================================
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "cryptlib.h"
+#include <openssl/rand.h>
+#include <openssl/x509.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include "asn1_locl.h"
+
+/* Generalised MIME like utilities for streaming ASN1. Although many
+ * have a PKCS7/CMS like flavour others are more general purpose.
+ */
+
+/* MIME format structures
+ * Note that all are translated to lower case apart from
+ * parameter values. Quotes are stripped off
+ */
+
+typedef struct {
+char *param_name;			/* Param name e.g. "micalg" */
+char *param_value;			/* Param value e.g. "sha1" */
+} MIME_PARAM;
+
+DECLARE_STACK_OF(MIME_PARAM)
+IMPLEMENT_STACK_OF(MIME_PARAM)
+
+typedef struct {
+char *name;				/* Name of line e.g. "content-type" */
+char *value;				/* Value of line e.g. "text/plain" */
+STACK_OF(MIME_PARAM) *params;		/* Zero or more parameters */
+} MIME_HEADER;
+
+DECLARE_STACK_OF(MIME_HEADER)
+IMPLEMENT_STACK_OF(MIME_HEADER)
+
+static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
+					const ASN1_ITEM *it);
+static char * strip_ends(char *name);
+static char * strip_start(char *name);
+static char * strip_end(char *name);
+static MIME_HEADER *mime_hdr_new(char *name, char *value);
+static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
+static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
+static int mime_hdr_cmp(const MIME_HEADER * const *a,
+			const MIME_HEADER * const *b);
+static int mime_param_cmp(const MIME_PARAM * const *a,
+			const MIME_PARAM * const *b);
+static void mime_param_free(MIME_PARAM *param);
+static int mime_bound_check(char *line, int linelen, char *bound, int blen);
+static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
+static int strip_eol(char *linebuf, int *plen);
+static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
+static void mime_hdr_free(MIME_HEADER *hdr);
+
+#define MAX_SMLEN 1024
+#define mime_debug(x) /* x */
+
+/* Output an ASN1 structure in BER format streaming if necessary */
+
+int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+				const ASN1_ITEM *it)
+	{
+	/* If streaming create stream BIO and copy all content through it */
+	if (flags & SMIME_STREAM)
+		{
+		BIO *bio, *tbio;
+		bio = BIO_new_NDEF(out, val, it);
+		if (!bio)
+			{
+			ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM,ERR_R_MALLOC_FAILURE);
+			return 0;
+			}
+		SMIME_crlf_copy(in, bio, flags);
+		(void)BIO_flush(bio);
+		/* Free up successive BIOs until we hit the old output BIO */
+		do
+			{
+			tbio = BIO_pop(bio);
+			BIO_free(bio);
+			bio = tbio;
+			} while (bio != out);
+		}
+	/* else just write out ASN1 structure which will have all content
+	 * stored internally
+	 */
+	else
+		ASN1_item_i2d_bio(it, out, val);
+	return 1;
+	}
+
+/* Base 64 read and write of ASN1 structure */
+
+static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+				const ASN1_ITEM *it)
+	{
+	BIO *b64;
+	int r;
+	b64 = BIO_new(BIO_f_base64());
+	if(!b64)
+		{
+		ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE);
+		return 0;
+		}
+	/* prepend the b64 BIO so all data is base64 encoded.
+	 */
+	out = BIO_push(b64, out);
+	r = i2d_ASN1_bio_stream(out, val, in, flags, it);
+	(void)BIO_flush(out);
+	BIO_pop(out);
+	BIO_free(b64);
+	return r;
+	}
+
+/* Streaming ASN1 PEM write */
+
+int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
+				const char *hdr,
+				const ASN1_ITEM *it)
+	{
+	int r;
+	BIO_printf(out, "-----BEGIN %s-----\n", hdr);
+	r = B64_write_ASN1(out, val, in, flags, it);
+	BIO_printf(out, "-----END %s-----\n", hdr);
+	return r;
+	}
+
+static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
+{
+	BIO *b64;
+	ASN1_VALUE *val;
+	if(!(b64 = BIO_new(BIO_f_base64()))) {
+		ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE);
+		return 0;
+	}
+	bio = BIO_push(b64, bio);
+	val = ASN1_item_d2i_bio(it, bio, NULL);
+	if(!val)
+		ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR);
+	(void)BIO_flush(bio);
+	bio = BIO_pop(bio);
+	BIO_free(b64);
+	return val;
+}
+
+/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
+
+static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
+	{
+	const EVP_MD *md;
+	int i, have_unknown = 0, write_comma, ret = 0, md_nid;
+	have_unknown = 0;
+	write_comma = 0;
+	for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++)
+		{
+		if (write_comma)
+			BIO_write(out, ",", 1);
+		write_comma = 1;
+		md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
+		md = EVP_get_digestbynid(md_nid);
+		if (md && md->md_ctrl)
+			{
+			int rv;
+			char *micstr;
+			rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
+			if (rv > 0)
+				{
+				BIO_puts(out, micstr);
+				OPENSSL_free(micstr);
+				continue;
+				}
+			if (rv != -2)
+				goto err;
+			}
+		switch(md_nid)
+			{
+			case NID_sha1:
+			BIO_puts(out, "sha1");
+			break;
+
+			case NID_md5:
+			BIO_puts(out, "md5");
+			break;
+
+			case NID_sha256:
+			BIO_puts(out, "sha-256");
+			break;
+
+			case NID_sha384:
+			BIO_puts(out, "sha-384");
+			break;
+
+			case NID_sha512:
+			BIO_puts(out, "sha-512");
+			break;
+
+			case NID_id_GostR3411_94:
+			BIO_puts(out, "gostr3411-94");
+				goto err;
+			break;
+
+			default:
+			if (have_unknown)
+				write_comma = 0;
+			else
+				{
+				BIO_puts(out, "unknown");
+				have_unknown = 1;
+				}
+			break;
+
+			}
+		}
+
+	ret = 1;
+	err:
+
+	return ret;
+
+	}
+
+/* SMIME sender */
+
+int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
+				int ctype_nid, int econt_nid,
+				STACK_OF(X509_ALGOR) *mdalgs,
+				const ASN1_ITEM *it)
+{
+	char bound[33], c;
+	int i;
+	const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
+	const char *msg_type=NULL;
+	if (flags & SMIME_OLDMIME)
+		mime_prefix = "application/x-pkcs7-";
+	else
+		mime_prefix = "application/pkcs7-";
+
+	if (flags & SMIME_CRLFEOL)
+		mime_eol = "\r\n";
+	else
+		mime_eol = "\n";
+	if((flags & SMIME_DETACHED) && data) {
+	/* We want multipart/signed */
+		/* Generate a random boundary */
+		RAND_pseudo_bytes((unsigned char *)bound, 32);
+		for(i = 0; i < 32; i++) {
+			c = bound[i] & 0xf;
+			if(c < 10) c += '0';
+			else c += 'A' - 10;
+			bound[i] = c;
+		}
+		bound[32] = 0;
+		BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
+		BIO_printf(bio, "Content-Type: multipart/signed;");
+		BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
+		BIO_puts(bio, " micalg=\"");
+		asn1_write_micalg(bio, mdalgs);
+		BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
+						bound, mime_eol, mime_eol);
+		BIO_printf(bio, "This is an S/MIME signed message%s%s",
+						mime_eol, mime_eol);
+		/* Now write out the first part */
+		BIO_printf(bio, "------%s%s", bound, mime_eol);
+		if (!asn1_output_data(bio, data, val, flags, it))
+			return 0;
+		BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
+
+		/* Headers for signature */
+
+		BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix); 
+		BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
+		BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
+								mime_eol);
+		BIO_printf(bio, "Content-Disposition: attachment;");
+		BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
+							mime_eol, mime_eol);
+		B64_write_ASN1(bio, val, NULL, 0, it);
+		BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
+							mime_eol, mime_eol);
+		return 1;
+	}
+
+	/* Determine smime-type header */
+
+	if (ctype_nid == NID_pkcs7_enveloped)
+		msg_type = "enveloped-data";
+	else if (ctype_nid == NID_pkcs7_signed)
+		{
+		if (econt_nid == NID_id_smime_ct_receipt)
+			msg_type = "signed-receipt";
+		else if (sk_X509_ALGOR_num(mdalgs) >= 0)
+			msg_type = "signed-data";
+		else
+			msg_type = "certs-only";
+		}
+	else if (ctype_nid == NID_id_smime_ct_compressedData)
+		{
+		msg_type = "compressed-data";
+		cname = "smime.p7z";
+		}
+	/* MIME headers */
+	BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
+	BIO_printf(bio, "Content-Disposition: attachment;");
+	BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
+	BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
+	if (msg_type)
+		BIO_printf(bio, " smime-type=%s;", msg_type);
+	BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
+	BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
+						mime_eol, mime_eol);
+	if (!B64_write_ASN1(bio, val, data, flags, it))
+		return 0;
+	BIO_printf(bio, "%s", mime_eol);
+	return 1;
+}
+
+/* Handle output of ASN1 data */
+
+
+static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
+					const ASN1_ITEM *it)
+	{
+	BIO *tmpbio;
+	const ASN1_AUX *aux = it->funcs;
+	ASN1_STREAM_ARG sarg;
+
+	if (!(flags & SMIME_DETACHED))
+		{
+		SMIME_crlf_copy(data, out, flags);
+		return 1;
+		}
+
+	if (!aux || !aux->asn1_cb)
+		{
+		ASN1err(ASN1_F_ASN1_OUTPUT_DATA,
+					ASN1_R_STREAMING_NOT_SUPPORTED);
+		return 0;
+		}
+
+	sarg.out = out;
+	sarg.ndef_bio = NULL;
+	sarg.boundary = NULL;
+
+	/* Let ASN1 code prepend any needed BIOs */
+
+	if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
+		return 0;
+
+	/* Copy data across, passing through filter BIOs for processing */
+	SMIME_crlf_copy(data, sarg.ndef_bio, flags);
+
+	/* Finalize structure */
+	if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
+		return 0;
+
+	/* Now remove any digests prepended to the BIO */
+
+	while (sarg.ndef_bio != out)
+		{
+		tmpbio = BIO_pop(sarg.ndef_bio);
+		BIO_free(sarg.ndef_bio);
+		sarg.ndef_bio = tmpbio;
+		}
+
+	return 1;
+
+	}
+
+/* SMIME reader: handle multipart/signed and opaque signing.
+ * in multipart case the content is placed in a memory BIO
+ * pointed to by "bcont". In opaque this is set to NULL
+ */
+
+ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
+{
+	BIO *asnin;
+	STACK_OF(MIME_HEADER) *headers = NULL;
+	STACK_OF(BIO) *parts = NULL;
+	MIME_HEADER *hdr;
+	MIME_PARAM *prm;
+	ASN1_VALUE *val;
+	int ret;
+
+	if(bcont) *bcont = NULL;
+
+	if (!(headers = mime_parse_hdr(bio))) {
+		ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR);
+		return NULL;
+	}
+
+	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
+		return NULL;
+	}
+
+	/* Handle multipart/signed */
+
+	if(!strcmp(hdr->value, "multipart/signed")) {
+		/* Split into two parts */
+		prm = mime_param_find(hdr, "boundary");
+		if(!prm || !prm->param_value) {
+			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+			ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
+			return NULL;
+		}
+		ret = multi_split(bio, prm->param_value, &parts);
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		if(!ret || (sk_BIO_num(parts) != 2) ) {
+			ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
+			sk_BIO_pop_free(parts, BIO_vfree);
+			return NULL;
+		}
+
+		/* Parse the signature piece */
+		asnin = sk_BIO_value(parts, 1);
+
+		if (!(headers = mime_parse_hdr(asnin))) {
+			ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR);
+			sk_BIO_pop_free(parts, BIO_vfree);
+			return NULL;
+		}
+
+		/* Get content type */
+
+		if(!(hdr = mime_hdr_find(headers, "content-type")) ||
+								 !hdr->value) {
+			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+			ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
+			return NULL;
+		}
+
+		if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
+			strcmp(hdr->value, "application/pkcs7-signature")) {
+			sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+			ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE);
+			ERR_add_error_data(2, "type: ", hdr->value);
+			sk_BIO_pop_free(parts, BIO_vfree);
+			return NULL;
+		}
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		/* Read in ASN1 */
+		if(!(val = b64_read_asn1(asnin, it))) {
+			ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR);
+			sk_BIO_pop_free(parts, BIO_vfree);
+			return NULL;
+		}
+
+		if(bcont) {
+			*bcont = sk_BIO_value(parts, 0);
+			BIO_free(asnin);
+			sk_BIO_free(parts);
+		} else sk_BIO_pop_free(parts, BIO_vfree);
+		return val;
+	}
+		
+	/* OK, if not multipart/signed try opaque signature */
+
+	if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
+	    strcmp (hdr->value, "application/pkcs7-mime")) {
+		ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE);
+		ERR_add_error_data(2, "type: ", hdr->value);
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		return NULL;
+	}
+
+	sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+	
+	if(!(val = b64_read_asn1(bio, it))) {
+		ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
+		return NULL;
+	}
+	return val;
+
+}
+
+/* Copy text from one BIO to another making the output CRLF at EOL */
+int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
+{
+	BIO *bf;
+	char eol;
+	int len;
+	char linebuf[MAX_SMLEN];
+	/* Buffer output so we don't write one line at a time. This is
+	 * useful when streaming as we don't end up with one OCTET STRING
+	 * per line.
+	 */
+	bf = BIO_new(BIO_f_buffer());
+	if (!bf)
+		return 0;
+	out = BIO_push(bf, out);
+	if(flags & SMIME_BINARY)
+		{
+		while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
+						BIO_write(out, linebuf, len);
+		}
+	else
+		{
+		if(flags & SMIME_TEXT)
+			BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
+		while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0)
+			{
+			eol = strip_eol(linebuf, &len);
+			if (len)
+				BIO_write(out, linebuf, len);
+			if(eol) BIO_write(out, "\r\n", 2);
+			}
+		}
+	(void)BIO_flush(out);
+	BIO_pop(out);
+	BIO_free(bf);
+	return 1;
+}
+
+/* Strip off headers if they are text/plain */
+int SMIME_text(BIO *in, BIO *out)
+{
+	char iobuf[4096];
+	int len;
+	STACK_OF(MIME_HEADER) *headers;
+	MIME_HEADER *hdr;
+
+	if (!(headers = mime_parse_hdr(in))) {
+		ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR);
+		return 0;
+	}
+	if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
+		ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE);
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		return 0;
+	}
+	if (strcmp (hdr->value, "text/plain")) {
+		ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE);
+		ERR_add_error_data(2, "type: ", hdr->value);
+		sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+		return 0;
+	}
+	sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
+	while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
+						BIO_write(out, iobuf, len);
+	if (len < 0)
+		return 0;
+	return 1;
+}
+
+/* Split a multipart/XXX message body into component parts: result is
+ * canonical parts in a STACK of bios
+ */
+
+static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
+{
+	char linebuf[MAX_SMLEN];
+	int len, blen;
+	int eol = 0, next_eol = 0;
+	BIO *bpart = NULL;
+	STACK_OF(BIO) *parts;
+	char state, part, first;
+
+	blen = strlen(bound);
+	part = 0;
+	state = 0;
+	first = 1;
+	parts = sk_BIO_new_null();
+	*ret = parts;
+	while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+		state = mime_bound_check(linebuf, len, bound, blen);
+		if(state == 1) {
+			first = 1;
+			part++;
+		} else if(state == 2) {
+			sk_BIO_push(parts, bpart);
+			return 1;
+		} else if(part) {
+			/* Strip CR+LF from linebuf */
+			next_eol = strip_eol(linebuf, &len);
+			if(first) {
+				first = 0;
+				if(bpart) sk_BIO_push(parts, bpart);
+				bpart = BIO_new(BIO_s_mem());
+				BIO_set_mem_eof_return(bpart, 0);
+			} else if (eol)
+				BIO_write(bpart, "\r\n", 2);
+			eol = next_eol;
+			if (len)
+				BIO_write(bpart, linebuf, len);
+		}
+	}
+	return 0;
+}
+
+/* This is the big one: parse MIME header lines up to message body */
+
+#define MIME_INVALID	0
+#define MIME_START	1
+#define MIME_TYPE	2
+#define MIME_NAME	3
+#define MIME_VALUE	4
+#define MIME_QUOTE	5
+#define MIME_COMMENT	6
+
+
+static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
+{
+	char *p, *q, c;
+	char *ntmp;
+	char linebuf[MAX_SMLEN];
+	MIME_HEADER *mhdr = NULL;
+	STACK_OF(MIME_HEADER) *headers;
+	int len, state, save_state = 0;
+
+	headers = sk_MIME_HEADER_new(mime_hdr_cmp);
+	while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
+	/* If whitespace at line start then continuation line */
+	if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
+	else state = MIME_START;
+	ntmp = NULL;
+	/* Go through all characters */
+	for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
+
+	/* State machine to handle MIME headers
+	 * if this looks horrible that's because it *is*
+         */
+
+		switch(state) {
+			case MIME_START:
+			if(c == ':') {
+				state = MIME_TYPE;
+				*p = 0;
+				ntmp = strip_ends(q);
+				q = p + 1;
+			}
+			break;
+
+			case MIME_TYPE:
+			if(c == ';') {
+				mime_debug("Found End Value\n");
+				*p = 0;
+				mhdr = mime_hdr_new(ntmp, strip_ends(q));
+				sk_MIME_HEADER_push(headers, mhdr);
+				ntmp = NULL;
+				q = p + 1;
+				state = MIME_NAME;
+			} else if(c == '(') {
+				save_state = state;
+				state = MIME_COMMENT;
+			}
+			break;
+
+			case MIME_COMMENT:
+			if(c == ')') {
+				state = save_state;
+			}
+			break;
+
+			case MIME_NAME:
+			if(c == '=') {
+				state = MIME_VALUE;
+				*p = 0;
+				ntmp = strip_ends(q);
+				q = p + 1;
+			}
+			break ;
+
+			case MIME_VALUE:
+			if(c == ';') {
+				state = MIME_NAME;
+				*p = 0;
+				mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
+				ntmp = NULL;
+				q = p + 1;
+			} else if (c == '"') {
+				mime_debug("Found Quote\n");
+				state = MIME_QUOTE;
+			} else if(c == '(') {
+				save_state = state;
+				state = MIME_COMMENT;
+			}
+			break;
+
+			case MIME_QUOTE:
+			if(c == '"') {
+				mime_debug("Found Match Quote\n");
+				state = MIME_VALUE;
+			}
+			break;
+		}
+	}
+
+	if(state == MIME_TYPE) {
+		mhdr = mime_hdr_new(ntmp, strip_ends(q));
+		sk_MIME_HEADER_push(headers, mhdr);
+	} else if(state == MIME_VALUE)
+			 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
+	if(p == linebuf) break;	/* Blank line means end of headers */
+}
+
+return headers;
+
+}
+
+static char *strip_ends(char *name)
+{
+	return strip_end(strip_start(name));
+}
+
+/* Strip a parameter of whitespace from start of param */
+static char *strip_start(char *name)
+{
+	char *p, c;
+	/* Look for first non white space or quote */
+	for(p = name; (c = *p) ;p++) {
+		if(c == '"') {
+			/* Next char is start of string if non null */
+			if(p[1]) return p + 1;
+			/* Else null string */
+			return NULL;
+		}
+		if(!isspace((unsigned char)c)) return p;
+	}
+	return NULL;
+}
+
+/* As above but strip from end of string : maybe should handle brackets? */
+static char *strip_end(char *name)
+{
+	char *p, c;
+	if(!name) return NULL;
+	/* Look for first non white space or quote */
+	for(p = name + strlen(name) - 1; p >= name ;p--) {
+		c = *p;
+		if(c == '"') {
+			if(p - 1 == name) return NULL;
+			*p = 0;
+			return name;
+		}
+		if(isspace((unsigned char)c)) *p = 0;	
+		else return name;
+	}
+	return NULL;
+}
+
+static MIME_HEADER *mime_hdr_new(char *name, char *value)
+{
+	MIME_HEADER *mhdr;
+	char *tmpname, *tmpval, *p;
+	int c;
+	if(name) {
+		if(!(tmpname = BUF_strdup(name))) return NULL;
+		for(p = tmpname ; *p; p++) {
+			c = *p;
+			if(isupper(c)) {
+				c = tolower(c);
+				*p = c;
+			}
+		}
+	} else tmpname = NULL;
+	if(value) {
+		if(!(tmpval = BUF_strdup(value))) return NULL;
+		for(p = tmpval ; *p; p++) {
+			c = *p;
+			if(isupper(c)) {
+				c = tolower(c);
+				*p = c;
+			}
+		}
+	} else tmpval = NULL;
+	mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
+	if(!mhdr) return NULL;
+	mhdr->name = tmpname;
+	mhdr->value = tmpval;
+	if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
+	return mhdr;
+}
+		
+static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
+{
+	char *tmpname, *tmpval, *p;
+	int c;
+	MIME_PARAM *mparam;
+	if(name) {
+		tmpname = BUF_strdup(name);
+		if(!tmpname) return 0;
+		for(p = tmpname ; *p; p++) {
+			c = *p;
+			if(isupper(c)) {
+				c = tolower(c);
+				*p = c;
+			}
+		}
+	} else tmpname = NULL;
+	if(value) {
+		tmpval = BUF_strdup(value);
+		if(!tmpval) return 0;
+	} else tmpval = NULL;
+	/* Parameter values are case sensitive so leave as is */
+	mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
+	if(!mparam) return 0;
+	mparam->param_name = tmpname;
+	mparam->param_value = tmpval;
+	sk_MIME_PARAM_push(mhdr->params, mparam);
+	return 1;
+}
+
+static int mime_hdr_cmp(const MIME_HEADER * const *a,
+			const MIME_HEADER * const *b)
+{
+	return(strcmp((*a)->name, (*b)->name));
+}
+
+static int mime_param_cmp(const MIME_PARAM * const *a,
+			const MIME_PARAM * const *b)
+{
+	return(strcmp((*a)->param_name, (*b)->param_name));
+}
+
+/* Find a header with a given name (if possible) */
+
+static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
+{
+	MIME_HEADER htmp;
+	int idx;
+	htmp.name = name;
+	idx = sk_MIME_HEADER_find(hdrs, &htmp);
+	if(idx < 0) return NULL;
+	return sk_MIME_HEADER_value(hdrs, idx);
+}
+
+static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
+{
+	MIME_PARAM param;
+	int idx;
+	param.param_name = name;
+	idx = sk_MIME_PARAM_find(hdr->params, &param);
+	if(idx < 0) return NULL;
+	return sk_MIME_PARAM_value(hdr->params, idx);
+}
+
+static void mime_hdr_free(MIME_HEADER *hdr)
+{
+	if(hdr->name) OPENSSL_free(hdr->name);
+	if(hdr->value) OPENSSL_free(hdr->value);
+	if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
+	OPENSSL_free(hdr);
+}
+
+static void mime_param_free(MIME_PARAM *param)
+{
+	if(param->param_name) OPENSSL_free(param->param_name);
+	if(param->param_value) OPENSSL_free(param->param_value);
+	OPENSSL_free(param);
+}
+
+/* Check for a multipart boundary. Returns:
+ * 0 : no boundary
+ * 1 : part boundary
+ * 2 : final boundary
+ */
+static int mime_bound_check(char *line, int linelen, char *bound, int blen)
+{
+	if(linelen == -1) linelen = strlen(line);
+	if(blen == -1) blen = strlen(bound);
+	/* Quickly eliminate if line length too short */
+	if(blen + 2 > linelen) return 0;
+	/* Check for part boundary */
+	if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
+		if(!strncmp(line + blen + 2, "--", 2)) return 2;
+		else return 1;
+	}
+	return 0;
+}
+
+static int strip_eol(char *linebuf, int *plen)
+	{
+	int len = *plen;
+	char *p, c;
+	int is_eol = 0;
+	p = linebuf + len - 1;
+	for (p = linebuf + len - 1; len > 0; len--, p--)
+		{
+		c = *p;
+		if (c == '\n')
+			is_eol = 1;
+		else if (c != '\r')
+			break;
+		}
+	*plen = len;
+	return is_eol;
+	}