New virtual class for manipulating cryptographic message syntax messages

2001-05-31  Jeffrey Stedfast  <fejj@ximian.com>

	* camel-cms-context.[c,h]: New virtual class for manipulating
	cryptographic message syntax messages (like S/MIME).

	* camel-smime-context.[c,h]: Modified to inherit from the
	CamelCMSContext class rather than the CamelCipherContext class.

	* camel-smime.[c,h]: Removed - just use camel-smime-context
	directly.

	* camel-smime-utils.[c,h]: New source files. Moved the 2 useful
	functions from camel-smime.[c,h] into here.

svn path=/trunk/; revision=10065

1 files changed, 126 insertions, 0 deletions

diff --git a/camel/camel-smime-utils.c b/camel/camel-smime-utils.c
new file mode 100644
index 0000000000..cf588898f3
--- /dev/null
+++ b/camel/camel-smime-utils.c
@@ -0,0 +1,126 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ *  Authors: Jeffrey Stedfast <fejj@ximian.com>
+ *
+ *  Copyright 2001 Ximian, Inc. (www.ximian.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "camel-smime-utils.h"
+#include "camel-multipart.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define d(x) x
+
+/** rfc2633 stuff (aka S/MIME v3) ********************************/
+
+gboolean
+camel_smime_is_smime_v3_signed (CamelMimePart *mime_part)
+{
+	CamelDataWrapper *wrapper;
+	CamelMultipart *mp;
+	CamelMimePart *part;
+	CamelContentType *type;
+	const gchar *param, *micalg;
+	int nparts;
+	
+	/* check that we have a multipart/signed */
+	type = camel_mime_part_get_content_type (mime_part);
+	if (!header_content_type_is (type, "multipart", "signed"))
+		return FALSE;
+	
+	/* check that we have a protocol param with the value: "application/pkcs7-signature" */
+	param = header_content_type_param (type, "protocol");
+	if (!param || g_strcasecmp (param, "application/pkcs7-signature"))
+		return FALSE;
+	
+	/* check that we have a micalg parameter */
+	micalg = header_content_type_param (type, "micalg");
+	if (!micalg)
+		return FALSE;
+	
+	/* check that we have exactly 2 subparts */
+	wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (mime_part));
+	mp = CAMEL_MULTIPART (wrapper);
+	nparts = camel_multipart_get_number (mp);
+	if (nparts != 2)
+		return FALSE;
+	
+	/* The first part may be of any type except for 
+	 * application/pkcs7-signature - check it. */
+	part = camel_multipart_get_part (mp, 0);
+	type = camel_mime_part_get_content_type (part);
+	if (header_content_type_is (type, "application", "pkcs7-signature"))
+		return FALSE;
+	
+	/* The second part should be application/pkcs7-signature. */
+	part = camel_multipart_get_part (mp, 1);
+	type = camel_mime_part_get_content_type (part);
+	if (!header_content_type_is (type, "application", "pkcs7-signature"))
+		return FALSE;
+	
+	return TRUE;
+}
+
+gboolean
+camel_smime_is_smime_v3_encrypted (CamelMimePart *mime_part)
+{
+	char *types[] = { "p7m", "p7c", "p7s", NULL };
+	const gchar *param, *filename;
+	CamelContentType *type;
+	int i;
+	
+	/* check that we have a application/pkcs7-mime part */
+	type = camel_mime_part_get_content_type (mime_part);
+	if (header_content_type_is (type, "application", "pkcs7-mime")) {
+		/* check to make sure it's an encrypted pkcs7-mime part? */
+		return TRUE;
+	}
+	
+	if (header_content_type_is (type, "application", "octent-stream")) {
+		/* check to see if we have a paremeter called "smime-type" */
+		param = header_content_type_param (type, "smime-type");
+		if (param)
+			return TRUE;
+		
+		/* check to see if there is a name param and if it has a smime extension */
+		param = header_content_type_param (type, "smime-type");
+		if (param && *param && strlen (param) > 4) {
+			for (i = 0; types[i]; i++)
+				if (!g_strcasecmp (param + strlen (param)-4, types[i]))
+					return TRUE;
+		}
+		
+		/* check to see if there is a name param and if it has a smime extension */
+		filename = camel_mime_part_get_filename (mime_part);
+		if (filename && *filename && strlen (filename) > 4) {
+			for (i = 0; types[i]; i++)
+				if (!g_strcasecmp (filename + strlen (filename)-4, types[i]))
+					return TRUE;
+		}
+	}
+	
+	return FALSE;
+}