buddy.c

Linux下的多协议即时通讯程序源代码

	}

	/* Verify the attribute signatures */
	silc_hash_alloc((const unsigned char *)"sha1", &hash);

	if (usersign.data) {
		unsigned char *verifyd;
		SilcUInt32 verify_len;

		verifyd = silc_attribute_get_verify_data(client_entry->attrs,
							 FALSE, &verify_len);
		if (verifyd && !silc_pkcs_verify(client_entry->public_key,
						 usersign.data,
						 usersign.data_len,
						 verifyd, verify_len, hash))
			usign_success = FALSE;
		silc_free(verifyd);
	}

	if (serversign.data) {
		SilcPublicKey public_key;
		SilcPKCSType type = 0;
		unsigned char *verifyd;
		SilcUInt32 verify_len;

		if (!strcmp(serverpk.type, "silc-rsa"))
		  type = SILC_PKCS_SILC;
		else if (!strcmp(serverpk.type, "ssh-rsa"))
		  type = SILC_PKCS_SSH2;
		else if (!strcmp(serverpk.type, "x509v3-sign-rsa"))
		  type = SILC_PKCS_X509V3;
		else if (!strcmp(serverpk.type, "pgp-sign-rsa"))
		  type = SILC_PKCS_OPENPGP;

		if (silc_pkcs_public_key_alloc(type, serverpk.data,
					       serverpk.data_len,
					       &public_key)) {
			verifyd = silc_attribute_get_verify_data(client_entry->attrs,
								 TRUE, &verify_len);
			if (verifyd && !silc_pkcs_verify(public_key,
							 serversign.data,
							 serversign.data_len,
							 verifyd, verify_len,
							 hash))
				ssign_success = FALSE;
			silc_pkcs_public_key_free(public_key);
			silc_free(verifyd);
		}
	}

	fingerprint = silc_fingerprint(client_entry->fingerprint, 20);
	for (i = 0; i < strlen(fingerprint); i++)
		if (fingerprint[i] == ' ')
			fingerprint[i] = '_';

	if (usign_success || ssign_success) {
		struct passwd *pw;
		struct stat st;

		memset(filename2, 0, sizeof(filename2));

		/* Filename for dir */
		tmp = fingerprint + strlen(fingerprint) - 9;
		g_snprintf(filename, sizeof(filename) - 1,
			   "%s" G_DIR_SEPARATOR_S "friends" G_DIR_SEPARATOR_S "%s",
			   silcpurple_silcdir(), tmp);

		pw = getpwuid(getuid());
		if (!pw)
			return;

		/* Create dir if it doesn't exist */
		if ((g_stat(filename, &st)) == -1) {
			if (errno == ENOENT) {
				if (pw->pw_uid == geteuid())
					g_mkdir(filename, 0755);
			}
		}

		/* Save VCard */
		g_snprintf(filename2, sizeof(filename2) - 1,
			   "%s" G_DIR_SEPARATOR_S "vcard", filename);
		if (vcard.full_name) {
			tmp = (char *)silc_vcard_encode(&vcard, &len);
			silc_file_writefile(filename2, tmp, len);
			silc_free(tmp);
		}

		/* Save status message */
		if (message) {
			memset(filename2, 0, sizeof(filename2));
			g_snprintf(filename2, sizeof(filename2) - 1,
				   "%s" G_DIR_SEPARATOR_S "status_message.mime",
				   filename);
			tmp = (char *)silc_mime_get_data(message, &len);
			silc_file_writefile(filename2, tmp, len);
			silc_mime_free(message);
		}

		/* Save extension data */
		if (extension) {
			memset(filename2, 0, sizeof(filename2));
			g_snprintf(filename2, sizeof(filename2) - 1,
				   "%s" G_DIR_SEPARATOR_S "extension.mime",
				   filename);
			tmp = (char *)silc_mime_get_data(extension, &len);
			silc_file_writefile(filename2, tmp, len);
			silc_mime_free(extension);
		}

		/* Save user icon */
		if (usericon) {
			const char *type = silc_mime_get_field(usericon, "Content-Type");
			if (type &&
			    (!strcmp(type, "image/jpeg") ||
			     !strcmp(type, "image/gif") ||
			     !strcmp(type, "image/bmp") ||
			     !strcmp(type, "image/png"))) {
				const unsigned char *data;
				SilcUInt32 data_len;
				data = silc_mime_get_data(usericon, &data_len);
				if (data) {
					/* TODO: Check if SILC gives us something to use as the checksum instead */
					purple_buddy_icons_set_for_user(purple_buddy_get_account(r->b), purple_buddy_get_name(r->b), g_memdup(data, data_len), data_len, NULL);
				}
			}
			silc_mime_free(usericon);
		}
	}

	/* Save the public key path to buddy properties, as it is used
	   to identify the buddy in the network (and not the nickname). */
	memset(filename, 0, sizeof(filename));
	g_snprintf(filename, sizeof(filename) - 1,
		   "%s" G_DIR_SEPARATOR_S "clientkeys" G_DIR_SEPARATOR_S "clientkey_%s.pub",
		   silcpurple_silcdir(), fingerprint);
	purple_blist_node_set_string((PurpleBlistNode *)b, "public-key", filename);

	/* Update online status */
	purple_prpl_got_user_status(purple_buddy_get_account(r->b), purple_buddy_get_name(r->b), SILCPURPLE_STATUS_ID_AVAILABLE, NULL);

	/* Finally, start watching this user so we receive its status
	   changes from the server */
	g_snprintf(filename2, sizeof(filename2) - 1, "+%s", filename);
	silc_client_command_call(r->client, r->conn, NULL, "WATCH", "-pubkey",
				 filename2, NULL);

	silc_hash_free(hash);
	silc_free(fingerprint);
	silc_free(r->offline_pk);
	if (r->public_key)
	  silc_pkcs_public_key_free(r->public_key);
	silc_free(r);
}

static void
silcpurple_add_buddy_ask_import(void *user_data, const char *name)
{
	SilcPurpleBuddyRes r = (SilcPurpleBuddyRes)user_data;

	/* Load the public key */
	if (!silc_pkcs_load_public_key(name, &r->public_key)) {
		silcpurple_add_buddy_ask_pk_cb(r, 0);
		purple_notify_error(r->client->application,
				  _("Add Buddy"), _("Could not load public key"), NULL);
		return;
	}

	/* Now verify the public key */
	r->offline_pk = silc_pkcs_public_key_encode(r->public_key, &r->offline_pk_len);
	silcpurple_verify_public_key(r->client, r->conn, r->b->name,
				     SILC_CONN_CLIENT, r->public_key,
				     silcpurple_add_buddy_save, r);
}

static void
silcpurple_add_buddy_ask_pk_cancel(void *user_data, const char *name)
{
	SilcPurpleBuddyRes r = (SilcPurpleBuddyRes)user_data;

	/* The user did not import public key.  The buddy is unusable. */
	silcpurple_add_buddy_pk_no(r);
	silc_free(r);
}

static void
silcpurple_add_buddy_ask_pk_cb(SilcPurpleBuddyRes r, gint id)
{
	if (id != 0) {
		/* The user did not import public key.  The buddy is unusable. */
		silcpurple_add_buddy_pk_no(r);
		silc_free(r);
		return;
	}

	/* Open file selector to select the public key. */
	purple_request_file(r->client->application, _("Open..."), NULL, FALSE,
			    G_CALLBACK(silcpurple_add_buddy_ask_import),
			    G_CALLBACK(silcpurple_add_buddy_ask_pk_cancel),
			    purple_buddy_get_account(r->b), purple_buddy_get_name(r->b), NULL, r);

}

static void
silcpurple_add_buddy_ask_pk(SilcPurpleBuddyRes r)
{
	char tmp[512];
	g_snprintf(tmp, sizeof(tmp), _("The %s buddy is not present in the network"),
		   r->b->name);
	purple_request_action(r->client->application, _("Add Buddy"), tmp,
			      _("To add the buddy you must import his/her public key. "
				"Press Import to import a public key."), 0,
			      purple_buddy_get_account(r->b), purple_buddy_get_name(r->b), NULL, r, 2,
			      _("Cancel"), G_CALLBACK(silcpurple_add_buddy_ask_pk_cb),
			      _("_Import..."), G_CALLBACK(silcpurple_add_buddy_ask_pk_cb));
}

static SilcBool
silcpurple_add_buddy_getkey_cb(SilcClient client, SilcClientConnection conn,
			       SilcCommand command, SilcStatus status,
			       SilcStatus error, void *context, va_list ap)
{
	SilcPurpleBuddyRes r = context;
	SilcClientEntry client_entry;

	if (status != SILC_STATUS_OK) {
		/* The buddy is offline/nonexistent. We will require user
		   to associate a public key with the buddy or the buddy
		   cannot be added. */
		r->offline = TRUE;
		silcpurple_add_buddy_ask_pk(r);
		return FALSE;
	}

	/* Get the client entry. */
	client_entry = silc_client_get_client_by_id(r->client, r->conn,
						    &r->client_id);
	if (!client_entry || !client_entry->public_key) {
		/* The buddy is offline/nonexistent. We will require user
		   to associate a public key with the buddy or the buddy
		   cannot be added. */
		r->offline = TRUE;
		silcpurple_add_buddy_ask_pk(r);
		return FALSE;
	}

	/* Now verify the public key */
	silcpurple_verify_public_key(r->client, r->conn, client_entry->nickname,
				     SILC_CONN_CLIENT, client_entry->public_key,
				     silcpurple_add_buddy_save, r);
	return TRUE;
}

static void
silcpurple_add_buddy_select_cb(SilcPurpleBuddyRes r, PurpleRequestFields *fields)
{
	PurpleRequestField *f;
	const GList *list;
	SilcClientEntry client_entry;
	SilcDList clients;

	f = purple_request_fields_get_field(fields, "list");
	list = purple_request_field_list_get_selected(f);
	if (!list) {
		/* The user did not select any user. */
		silcpurple_add_buddy_pk_no(r);
		silc_free(r);
		return;
	}

	client_entry = purple_request_field_list_get_data(f, list->data);
	clients = silc_dlist_init();
	silc_dlist_add(clients, client_entry);
	silcpurple_add_buddy_resolved(r->client, r->conn, SILC_STATUS_OK,
				      clients, r);
	silc_dlist_uninit(clients);
}

static void
silcpurple_add_buddy_select_cancel(SilcPurpleBuddyRes r, PurpleRequestFields *fields)
{
	/* The user did not select any user. */
	silcpurple_add_buddy_pk_no(r);
	silc_free(r);
}

static void
silcpurple_add_buddy_select(SilcPurpleBuddyRes r, SilcDList clients)
{
	PurpleRequestFields *fields;
	PurpleRequestFieldGroup *g;
	PurpleRequestField *f;
	char tmp[512], tmp2[128];
	char *fingerprint;
	SilcClientEntry client_entry;

	fields = purple_request_fields_new();
	g = purple_request_field_group_new(NULL);
	f = purple_request_field_list_new("list", NULL);
	purple_request_field_group_add_field(g, f);
	purple_request_field_list_set_multi_select(f, FALSE);
	purple_request_fields_add_group(fields, g);

	silc_dlist_start(clients);
	while ((client_entry = silc_dlist_get(clients))) {
		fingerprint = NULL;
		if (*client_entry->fingerprint) {
			fingerprint = silc_fingerprint(client_entry->fingerprint, 20);
			g_snprintf(tmp2, sizeof(tmp2), "\n%s", fingerprint);
		}
		g_snprintf(tmp, sizeof(tmp), "%s - %s (%s@%s)%s",
			   client_entry->realname, client_entry->nickname,
			   client_entry->username, *client_entry->hostname ?
			   client_entry->hostname : "",
			   fingerprint ? tmp2 : "");
		purple_request_field_list_add(f, tmp, client_entry);
		silc_free(fingerprint);
	}

	purple_request_fields(r->client->application, _("Add Buddy"),
			      _("Select correct user"),
			      r->pubkey_search
			      ? _("More than one user was found with the same public key. Select "
				  "the correct user from the list to add to the buddy list.")
			      : _("More than one user was found with the same name. Select "
				  "the correct user from the list to add to the buddy list."),
			      fields,
			      _("OK"), G_CALLBACK(silcpurple_add_buddy_select_cb),
			      _("Cancel"), G_CALLBACK(silcpurple_add_buddy_select_cancel),
			      purple_buddy_get_account(r->b), purple_buddy_get_name(r->b), NULL, r);
}

static void
silcpurple_add_buddy_resolved(SilcClient client,
			      SilcClientConnection conn,
			      SilcStatus status,
			      SilcDList clients,
			      void *context)
{
	SilcPurpleBuddyRes r = context;
	PurpleBuddy *b = r->b;
	SilcAttributePayload pub;
	SilcAttributeObjPk userpk;
	const char *filename;
	SilcClientEntry client_entry = NULL;
	SilcUInt16 cmd_ident;

	filename = purple_blist_node_get_string((PurpleBlistNode *)b, "public-key");

	/* If the buddy is offline/nonexistent, we will require user
	   to associate a public key with the buddy or the buddy
	   cannot be added. */
	if (!clients) {
		if (r->init) {
			silc_free(r);
			return;
		}

		r->offline = TRUE;
		/* If the user has already associated a public key, try loading it
		 * before prompting the user to load it again */
		if (filename != NULL)
			silcpurple_add_buddy_ask_import(r, filename);
		else
			silcpurple_add_buddy_ask_pk(r);
		return;
	}

	/* If more than one client was found with nickname, we need to verify
	   from user which one is the correct. */
	if (silc_dlist_count(clients) > 1 && !r->pubkey_search) {
		if (r->init) {
			silc_free(r);
			return;
		}

		silcpurple_add_buddy_select(r, clients);
		return;
	}

	silc_dlist_start(clients);
	client_entry = silc_dlist_get(clients);

	/* If we searched using public keys and more than one entry was found
	   the same person is logged on multiple times. */
	if (silc_dlist_count(clients) > 1 && r->pubkey_search && b->name) {
		if (r->init) {
			/* Find the entry that closest matches to the
			   buddy nickname. */
			SilcClientEntry entry;
			silc_dlist_start(clients);
			while ((entry = silc_dlist_get(clients))) {
				if (!strncasecmp(b->name, entry->nickname,
						 strlen(b->name))) {
					client_entry = entry;
					break;
				}
			}
		} else {
			/* Verify from user which one is correct */
			silcpurple_add_buddy_select(r, clients);
			return;
		}
	}

	/* The client was found.  Now get its public key and verify
	   that before adding the buddy. */
	memset(&userpk, 0, sizeof(userpk));
	b->proto_data = silc_memdup(&client_entry->id, sizeof(client_entry->id));
	r->client_id = client_entry->id;

	/* Get the public key from attributes, if not present then
	   resolve it with GETKEY unless we have it cached already. */
	if (client_entry->attrs && !client_entry->public_key) {
		pub = silcpurple_get_attr(client_entry->attrs,
					  SILC_ATTRIBUTE_USER_PUBLIC_KEY);
		if (!pub || !silc_attribute_get_object(pub, (void *)&userpk,
						       sizeof(userpk))) {
			/* Get public key with GETKEY */
			cmd_ident =
			  silc_client_command_call(client, conn, NULL,
						   "GETKEY", client_entry->nickname, NULL);
			silc_client_command_pending(conn, SILC_COMMAND_GETKEY,
						    cmd_ident,
						    silcpurple_add_buddy_getkey_cb,
						    r);
			return;
		}
		if (!silc_pkcs_public_key_alloc(SILC_PKCS_SILC,
						userpk.data, userpk.data_len,
						&client_entry->public_key))