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, 0 insertions, 504 deletions

diff --git a/camel/camel-smime.c b/camel/camel-smime.c
deleted file mode 100644
index 587fcb6057..0000000000
--- a/camel/camel-smime.c
+++ /dev/null
@@ -1,504 +0,0 @@
-/* -*- 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.h"
-#include "camel-mime-filter-from.h"
-#include "camel-mime-filter-crlf.h"
-#include "camel-stream-filter.h"
-#include "camel-stream-mem.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;
-}
-
-
-static void
-smime_part_sign_restore_part (CamelMimePart *mime_part, GSList *encodings)
-{
-	CamelDataWrapper *wrapper;
-	
-	wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (mime_part));
-	if (!wrapper)
-		return;
-	
-	if (CAMEL_IS_MULTIPART (wrapper)) {
-		int parts, i;
-		
-		parts = camel_multipart_get_number (CAMEL_MULTIPART (wrapper));
-		for (i = 0; i < parts; i++) {
-			CamelMimePart *part = camel_multipart_get_part (CAMEL_MULTIPART (wrapper), i);
-			
-			smime_part_sign_restore_part (part, encodings);
-			encodings = encodings->next;
-		}
-	} else {
-		CamelMimePartEncodingType encoding;
-		
-		encoding = GPOINTER_TO_INT (encodings->data);
-		
-		camel_mime_part_set_encoding (mime_part, encoding);
-	}
-}
-
-static void
-smime_part_sign_prepare_part (CamelMimePart *mime_part, GSList **encodings)
-{
-	CamelDataWrapper *wrapper;
-	int parts, i;
-	
-	wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (mime_part));
-	if (!wrapper)
-		return;
-	
-	if (CAMEL_IS_MULTIPART (wrapper)) {
-		parts = camel_multipart_get_number (CAMEL_MULTIPART (wrapper));
-		for (i = 0; i < parts; i++) {
-			CamelMimePart *part = camel_multipart_get_part (CAMEL_MULTIPART (wrapper), i);
-			
-			smime_part_sign_prepare_part (part, encodings);
-		}
-	} else {
-		CamelMimePartEncodingType encoding;
-		
-		encoding = camel_mime_part_get_encoding (mime_part);
-		
-		/* FIXME: find the best encoding for this part and use that instead?? */
-		/* the encoding should really be QP or Base64 */
-		if (encoding != CAMEL_MIME_PART_ENCODING_BASE64)
-			camel_mime_part_set_encoding (mime_part, CAMEL_MIME_PART_ENCODING_QUOTEDPRINTABLE);
-		
-		*encodings = g_slist_append (*encodings, GINT_TO_POINTER (encoding));
-	}
-}
-
-
-/**
- * camel_smime_part_sign:
- * @context: S/MIME Context
- * @mime_part: a MIME part that will be replaced by an S/MIME signed part
- * @userid: userid to sign with
- * @hash: one of CAMEL_CIPHER_HASH_TYPE_MD5 or CAMEL_CIPHER_HASH_TYPE_SHA1
- * @ex: exception which will be set if there are any errors.
- *
- * Constructs a S/MIME multipart in compliance with rfc2015/rfc2633 and
- * replaces @part with the generated multipart/signed. On failure,
- * @ex will be set and #part will remain untouched.
- **/
-void
-camel_smime_part_sign (CamelSMimeContext *context, CamelMimePart **mime_part, const char *userid,
-		       CamelCipherHash hash, CamelException *ex)
-{
-	CamelMimePart *part, *signed_part;
-	CamelMultipart *multipart;
-	CamelContentType *mime_type;
-	CamelStreamFilter *filtered_stream;
-	CamelMimeFilter *crlf_filter, *from_filter;
-	CamelStream *stream, *sigstream;
-	gchar *hash_type = NULL;
-	GSList *encodings = NULL;
-	
-	g_return_if_fail (*mime_part != NULL);
-	g_return_if_fail (CAMEL_IS_MIME_PART (*mime_part));
-	g_return_if_fail (userid != NULL);
-	
-	part = *mime_part;
-	
-	/* Prepare all the parts for signing... */
-	smime_part_sign_prepare_part (part, &encodings);
-	
-	/* get the cleartext */
-	stream = camel_stream_mem_new ();
-	crlf_filter = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_ENCODE,
-						  CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
-	from_filter = CAMEL_MIME_FILTER (camel_mime_filter_from_new ());
-	filtered_stream = camel_stream_filter_new_with_stream (stream);
-	camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (crlf_filter));
-	camel_object_unref (CAMEL_OBJECT (crlf_filter));
-	camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (from_filter));
-	camel_object_unref (CAMEL_OBJECT (from_filter));
-	camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (part), CAMEL_STREAM (filtered_stream));
-	camel_object_unref (CAMEL_OBJECT (filtered_stream));
-	
-	/* reset the stream */
-	camel_stream_reset (stream);
-	
-	/* construct the signature stream */
-	sigstream = camel_stream_mem_new ();
-	
-	switch (hash) {
-	case CAMEL_CIPHER_HASH_MD5:
-		hash_type = "md5";
-		break;
-	case CAMEL_CIPHER_HASH_SHA1:
-		hash_type = "sha1";
-		break;
-	default:
-		/* set a reasonable default */
-		hash = CAMEL_CIPHER_HASH_SHA1;
-		hash_type = "sha1";
-		break;
-	}
-	
-	/* get the signature */
-	if (camel_smime_sign (context, userid, hash, stream, sigstream, ex) == -1) {
-		camel_object_unref (CAMEL_OBJECT (stream));
-		camel_object_unref (CAMEL_OBJECT (sigstream));
-		
-		/* restore the original encoding */
-		smime_part_sign_restore_part (part, encodings);
-		g_slist_free (encodings);
-		return;
-	}
-	
-	camel_object_unref (CAMEL_OBJECT (stream));
-	camel_stream_reset (sigstream);
-	
-	/* we don't need these anymore... */
-	g_slist_free (encodings);
-	
-	/* construct the pkcs7-signature mime part */
-	signed_part = camel_mime_part_new ();
-	camel_mime_part_set_content (signed_part, CAMEL_STREAM_MEM (sigstream)->buffer->data,
-				     CAMEL_STREAM_MEM (sigstream)->buffer->len,
-				     "application/pkcs7-signature");
-	camel_object_unref (CAMEL_OBJECT (sigstream));
-	camel_mime_part_set_encoding (signed_part, CAMEL_MIME_PART_ENCODING_BASE64);
-	camel_mime_part_set_filename (signed_part, "smime.p7s");
-	
-	/* construct the container multipart/signed */
-	multipart = camel_multipart_new ();
-	
-	mime_type = header_content_type_new ("multipart", "signed");
-	header_content_type_set_param (mime_type, "micalg", hash_type);
-	header_content_type_set_param (mime_type, "protocol", "application/pkcs7-signature");
-	camel_data_wrapper_set_mime_type_field (CAMEL_DATA_WRAPPER (multipart), mime_type);
-	header_content_type_unref (mime_type);
-	
-	camel_multipart_set_boundary (multipart, NULL);
-	
-	/* add the parts to the multipart */
-	camel_multipart_add_part (multipart, part);
-	camel_object_unref (CAMEL_OBJECT (part));
-	camel_multipart_add_part (multipart, signed_part);
-	camel_object_unref (CAMEL_OBJECT (signed_part));
-	
-	/* replace the input part with the output part */
-	*mime_part = camel_mime_part_new ();
-	camel_medium_set_content_object (CAMEL_MEDIUM (*mime_part),
-					 CAMEL_DATA_WRAPPER (multipart));
-	camel_object_unref (CAMEL_OBJECT (multipart));
-}
-
-struct {
-	char *name;
-	CamelCipherHash hash;
-} known_hash_types[] = {
-	{ "md5", CAMEL_CIPHER_HASH_MD5 },
-	{ "rsa-md5", CAMEL_CIPHER_HASH_MD5 },
-	{ "sha1", CAMEL_CIPHER_HASH_SHA1 },
-	{ "rsa-sha1", CAMEL_CIPHER_HASH_SHA1 },
-	{ NULL, CAMEL_CIPHER_HASH_DEFAULT }
-};
-
-static CamelCipherHash
-get_hash_type (const char *string)
-{
-	int i;
-	
-	for (i = 0; known_hash_types[i].name; i++)
-		if (!g_strcasecmp (known_hash_types[i].name, string))
-			return known_hash_types[i].hash;
-	
-	return CAMEL_CIPHER_HASH_DEFAULT;
-}
-
-/**
- * camel_smime_part_verify:
- * @context: S/MIME Context
- * @mime_part: a multipart/signed MIME Part
- * @ex: exception
- *
- * Returns a CamelCipherValidity on success or NULL on fail.
- **/
-CamelCipherValidity *
-camel_smime_part_verify (CamelSMimeContext *context, CamelMimePart *mime_part, CamelException *ex)
-{
-	CamelDataWrapper *wrapper;
-	CamelMultipart *multipart;
-	CamelMimePart *part, *sigpart;
-	CamelStreamFilter *filtered_stream;
-	CamelMimeFilter *crlf_filter, *from_filter;
-	CamelStream *stream, *sigstream;
-	CamelContentType *type;
-	CamelCipherValidity *valid;
-	CamelCipherHash hash;
-	const char *hash_str;
-	
-	g_return_val_if_fail (mime_part != NULL, NULL);
-	g_return_val_if_fail (CAMEL_IS_MIME_PART (mime_part), NULL);
-	
-	if (!camel_smime_is_smime_v3_signed (mime_part))
-		return NULL;
-	
-	wrapper = camel_medium_get_content_object (CAMEL_MEDIUM (mime_part));
-	multipart = CAMEL_MULTIPART (wrapper);
-	
-	/* get the plain part */
-	part = camel_multipart_get_part (multipart, 0);
-	stream = camel_stream_mem_new ();
-	crlf_filter = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_ENCODE,
-						  CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
-	from_filter = CAMEL_MIME_FILTER (camel_mime_filter_from_new ());
-	filtered_stream = camel_stream_filter_new_with_stream (stream);
-	camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (crlf_filter));
-	camel_object_unref (CAMEL_OBJECT (crlf_filter));
-	camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (from_filter));
-	camel_object_unref (CAMEL_OBJECT (from_filter));
-	camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (part), CAMEL_STREAM (filtered_stream));
-	camel_object_unref (CAMEL_OBJECT (filtered_stream));
-	camel_stream_reset (stream);
-	
-	/* get the signed part */
-	sigpart = camel_multipart_get_part (multipart, 1);
-	sigstream = camel_stream_mem_new ();
-	camel_data_wrapper_write_to_stream (camel_medium_get_content_object (CAMEL_MEDIUM (sigpart)),
-					    sigstream);
-	camel_stream_reset (sigstream);
-	
-	/* verify */
-	type = camel_mime_part_get_content_type (sigpart);
-	hash_str = header_content_type_param (type, "micalg");
-	hash = get_hash_type (hash_str);
-	valid = camel_smime_verify (context, hash, stream, sigstream, ex);
-	
-	camel_object_unref (CAMEL_OBJECT (sigstream));
-	camel_object_unref (CAMEL_OBJECT (stream));
-	
-	return valid;
-}
-
-
-/**
- * camel_smime_part_encrypt:
- * @context: S/MIME Context
- * @mime_part: a MIME part that will be replaced by a pgp encrypted part
- * @recipients: list of recipient PGP Key IDs
- * @ex: exception which will be set if there are any errors.
- *
- * Constructs a PGP/MIME multipart in compliance with rfc2015 and
- * replaces #mime_part with the generated multipart/signed. On failure,
- * #ex will be set and #part will remain untouched.
- **/
-void
-camel_smime_part_encrypt (CamelSMimeContext *context, CamelMimePart **mime_part,
-			  GPtrArray *recipients, CamelException *ex)
-{
-	CamelMimePart *part, *encrypted_part;
-	CamelStreamFilter *filtered_stream;
-	CamelMimeFilter *crlf_filter;
-	CamelStream *stream, *ciphertext;
-	
-	g_return_if_fail (*mime_part != NULL);
-	g_return_if_fail (CAMEL_IS_MIME_PART (*mime_part));
-	g_return_if_fail (recipients != NULL);
-	
-	part = *mime_part;
-	
-	/* get the contents */
-	stream = camel_stream_mem_new ();
-	crlf_filter = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_ENCODE,
-						  CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
-	filtered_stream = camel_stream_filter_new_with_stream (stream);
-	camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (crlf_filter));
-	camel_object_unref (CAMEL_OBJECT (crlf_filter));
-	camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (part), CAMEL_STREAM (filtered_stream));
-	camel_object_unref (CAMEL_OBJECT (filtered_stream));
-	camel_stream_reset (stream);
-	
-	/* smime encrypt */
-	ciphertext = camel_stream_mem_new ();
-	if (camel_smime_encrypt (context, FALSE, NULL, recipients, stream, ciphertext, ex) == -1) {
-		camel_object_unref (CAMEL_OBJECT (stream));
-		camel_object_unref (CAMEL_OBJECT (ciphertext));
-		return;
-	}
-	
-	camel_object_unref (CAMEL_OBJECT (stream));
-	camel_stream_reset (ciphertext);
-	
-	/* construct the encrypted mime part */
-	encrypted_part = camel_mime_part_new ();
-	camel_mime_part_set_content (encrypted_part, CAMEL_STREAM_MEM (ciphertext)->buffer->data,
-				     CAMEL_STREAM_MEM (ciphertext)->buffer->len,
-				     "application/pkcs7-mime; smime-type=enveloped-data");
-	camel_mime_part_set_encoding (encrypted_part, CAMEL_MIME_PART_ENCODING_BASE64);
-	camel_object_unref (CAMEL_OBJECT (ciphertext));
-	
-	/* replace the input part with the output part */
-	camel_object_unref (CAMEL_OBJECT (*mime_part));
-	*mime_part = encrypted_part;
-}
-
-
-/**
- * camel_smime_part_decrypt:
- * @context: S/MIME Context
- * @mime_part: a S/MIME encrypted MIME Part
- * @ex: exception
- *
- * Returns the decrypted MIME Part on success or NULL on fail.
- **/
-CamelMimePart *
-camel_smime_part_decrypt (CamelSMimeContext *context, CamelMimePart *mime_part, CamelException *ex)
-{
-	CamelMimePart *part;
-	CamelStream *stream, *ciphertext;
-	
-	g_return_val_if_fail (mime_part != NULL, NULL);
-	g_return_val_if_fail (CAMEL_IS_MIME_PART (mime_part), NULL);
-	
-	/* make sure the mime part is a S/MIME encrypted */
-	if (!camel_smime_is_smime_v3_encrypted (mime_part))
-		return NULL;
-	
-	/* get the ciphertext */
-	ciphertext = camel_stream_mem_new ();
-	camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (mime_part), ciphertext);
-	camel_stream_reset (ciphertext);
-	
-	/* get the cleartext */
-	stream = camel_stream_mem_new ();
-	if (camel_smime_decrypt (context, ciphertext, stream, ex) == -1) {
-		camel_object_unref (CAMEL_OBJECT (ciphertext));
-		camel_object_unref (CAMEL_OBJECT (stream));
-		return NULL;
-	}
-	
-	camel_object_unref (CAMEL_OBJECT (ciphertext));
-	camel_stream_reset (stream);
-	
-	/* construct the new decrypted mime part from the stream */
-	part = camel_mime_part_new ();
-	camel_data_wrapper_construct_from_stream (CAMEL_DATA_WRAPPER (part), stream);
-	camel_object_unref (CAMEL_OBJECT (stream));
-	
-	return part;
-}