Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 1547 insertions, 0 deletions

diff --git a/src/lib-storage/index/shared/Makefile.am b/src/lib-storage/index/shared/Makefile.am
new file mode 100644
index 0000000..07980d6
--- /dev/null
+++ b/src/lib-storage/index/shared/Makefile.am
@@ -0,0 +1,19 @@
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diff --git a/src/lib-storage/index/shared/Makefile.in b/src/lib-storage/index/shared/Makefile.in
new file mode 100644
index 0000000..3c7d4e1
--- /dev/null
+++ b/src/lib-storage/index/shared/Makefile.in
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+	-I$(top_srcdir)/src/lib-storage/index
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
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+	-rm -f ./$(DEPDIR)/shared-storage.Plo
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib-storage/index/shared/shared-list.c b/src/lib-storage/index/shared/shared-list.c
new file mode 100644
index 0000000..c69c4db
--- /dev/null
+++ b/src/lib-storage/index/shared/shared-list.c
@@ -0,0 +1,310 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "imap-match.h"
+#include "mailbox-tree.h"
+#include "mailbox-list-private.h"
+#include "index-storage.h"
+#include "shared-storage.h"
+
+extern struct mailbox_list shared_mailbox_list;
+
+static struct mailbox_list *shared_list_alloc(void)
+{
+	struct mailbox_list *list;
+	pool_t pool;
+
+	pool = pool_alloconly_create("shared list", 2048);
+	list = p_new(pool, struct mailbox_list, 1);
+	*list = shared_mailbox_list;
+	list->pool = pool;
+	return list;
+}
+
+static void shared_list_deinit(struct mailbox_list *list)
+{
+	pool_unref(&list->pool);
+}
+
+static void shared_list_copy_error(struct mailbox_list *shared_list,
+				   struct mail_namespace *backend_ns)
+{
+	const char *str;
+	enum mail_error error;
+
+	str = mailbox_list_get_last_error(backend_ns->list, &error);
+	mailbox_list_set_error(shared_list, error, str);
+}
+
+static int
+shared_get_storage(struct mailbox_list **list, const char *vname,
+		   struct mail_storage **storage_r)
+{
+	struct mail_namespace *ns = (*list)->ns;
+	const char *name;
+
+	name = mailbox_list_get_storage_name(*list, vname);
+	if (*name == '\0' && (ns->flags & NAMESPACE_FLAG_AUTOCREATED) == 0) {
+		/* trying to access the shared/ prefix itself */
+		*storage_r = ns->storage;
+		return 0;
+	}
+
+	if (shared_storage_get_namespace(&ns, &name) < 0)
+		return -1;
+	*list = ns->list;
+	return mailbox_list_get_storage(list, vname, storage_r);
+}
+
+static char shared_list_get_hierarchy_sep(struct mailbox_list *list ATTR_UNUSED)
+{
+	return '/';
+}
+
+static int
+shared_list_get_path(struct mailbox_list *list, const char *name,
+		     enum mailbox_list_path_type type, const char **path_r)
+{
+	struct mail_namespace *ns = list->ns;
+
+	if (mail_namespace_get_default_storage(list->ns) == NULL ||
+	    name == NULL ||
+	    shared_storage_get_namespace(&ns, &name) < 0) {
+		/* we don't have a directory we can use. */
+		*path_r = NULL;
+		return 0;
+	}
+	return mailbox_list_get_path(ns->list, name, type, path_r);
+}
+
+static const char *
+shared_list_get_temp_prefix(struct mailbox_list *list, bool global ATTR_UNUSED)
+{
+	i_panic("shared mailbox list: Can't return a temp prefix for '%s'",
+		list->ns->prefix);
+}
+
+static const char *
+shared_list_join_refpattern(struct mailbox_list *list,
+			    const char *ref, const char *pattern)
+{
+	struct mail_namespace *ns = list->ns;
+	const char *ns_ref, *prefix = list->ns->prefix;
+	size_t prefix_len = strlen(prefix);
+
+	if (*ref != '\0' && str_begins(ref, prefix))
+		ns_ref = ref + prefix_len;
+	else
+		ns_ref = NULL;
+
+	if (ns_ref != NULL && *ns_ref != '\0' &&
+	    shared_storage_get_namespace(&ns, &ns_ref) == 0)
+		return mailbox_list_join_refpattern(ns->list, ref, pattern);
+
+	/* fallback to default behavior */
+	if (*ref != '\0')
+		pattern = t_strconcat(ref, pattern, NULL);
+	return pattern;
+}
+
+static void
+shared_list_create_missing_namespaces(struct mailbox_list *list,
+				      const char *const *patterns)
+{
+	struct mail_namespace *ns;
+	char sep = mail_namespace_get_sep(list->ns);
+	const char *list_pat, *name;
+	unsigned int i;
+
+	for (i = 0; patterns[i] != NULL; i++) {
+		const char *last = NULL, *p;
+
+		/* we'll require that the pattern begins with the list's
+		   namespace prefix. we could also handle other patterns
+		   (e.g. %/user/%), but it's more of a theoretical problem. */
+		if (strncmp(list->ns->prefix, patterns[i],
+			    list->ns->prefix_len) != 0)
+			continue;
+		list_pat = patterns[i] + list->ns->prefix_len;
+
+		for (p = list_pat; *p != '\0'; p++) {
+			if (*p == '%' || *p == '*')
+				break;
+			if (*p == sep)
+				last = p;
+		}
+		if (last != NULL) {
+			ns = list->ns;
+			name = t_strdup_until(list_pat, last);
+			(void)shared_storage_get_namespace(&ns, &name);
+		}
+	}
+}
+
+static struct mailbox_list_iterate_context *
+shared_list_iter_init(struct mailbox_list *list, const char *const *patterns,
+		      enum mailbox_list_iter_flags flags)
+{
+	struct mailbox_list_iterate_context *ctx;
+	pool_t pool;
+	char sep = mail_namespace_get_sep(list->ns);
+
+	pool = pool_alloconly_create("mailbox list shared iter", 1024);
+	ctx = p_new(pool, struct mailbox_list_iterate_context, 1);
+	ctx->pool = pool;
+	ctx->list = list;
+	ctx->flags = flags;
+	ctx->glob = imap_match_init_multiple(pool, patterns, FALSE, sep);
+	array_create(&ctx->module_contexts, pool, sizeof(void *), 5);
+
+	if ((flags & MAILBOX_LIST_ITER_SELECT_SUBSCRIBED) == 0 &&
+	    (list->ns->flags & NAMESPACE_FLAG_AUTOCREATED) == 0) T_BEGIN {
+		shared_list_create_missing_namespaces(list, patterns);
+	} T_END;
+	return ctx;
+}
+
+static const struct mailbox_info *
+shared_list_iter_next(struct mailbox_list_iterate_context *ctx ATTR_UNUSED)
+{
+	return NULL;
+}
+
+static int shared_list_iter_deinit(struct mailbox_list_iterate_context *ctx)
+{
+	pool_unref(&ctx->pool);
+	return 0;
+}
+
+static int
+shared_list_subscriptions_refresh(struct mailbox_list *src_list,
+				  struct mailbox_list *dest_list)
+{
+	char sep;
+
+	if (dest_list->subscriptions == NULL) {
+		sep = mail_namespace_get_sep(src_list->ns);
+		dest_list->subscriptions = mailbox_tree_init(sep);
+	}
+	return 0;
+}
+
+static int shared_list_set_subscribed(struct mailbox_list *list,
+				      const char *name, bool set)
+{
+	struct mail_namespace *ns = list->ns;
+	int ret;
+
+	if (shared_storage_get_namespace(&ns, &name) < 0)
+		return -1;
+	ret = mailbox_list_set_subscribed(ns->list, name, set);
+	if (ret < 0)
+		shared_list_copy_error(list, ns);
+	return ret;
+}
+
+static int
+shared_list_delete_mailbox(struct mailbox_list *list, const char *name)
+{
+	struct mail_namespace *ns = list->ns;
+	int ret;
+
+	if (shared_storage_get_namespace(&ns, &name) < 0)
+		return -1;
+	ret = ns->list->v.delete_mailbox(ns->list, name);
+	if (ret < 0)
+		shared_list_copy_error(list, ns);
+	return ret;
+}
+
+static int
+shared_list_delete_dir(struct mailbox_list *list, const char *name)
+{
+	struct mail_namespace *ns = list->ns;
+	int ret;
+
+	if (shared_storage_get_namespace(&ns, &name) < 0)
+		return -1;
+	ret = mailbox_list_delete_dir(ns->list, name);
+	if (ret < 0)
+		shared_list_copy_error(list, ns);
+	return ret;
+}
+
+static int
+shared_list_delete_symlink(struct mailbox_list *list, const char *name)
+{
+	struct mail_namespace *ns = list->ns;
+	int ret;
+
+	if (shared_storage_get_namespace(&ns, &name) < 0)
+		return -1;
+	ret = mailbox_list_delete_symlink(ns->list, name);
+	if (ret < 0)
+		shared_list_copy_error(list, ns);
+	return ret;
+}
+
+static int shared_list_rename_get_ns(struct mailbox_list *oldlist,
+				     const char **oldname,
+				     struct mailbox_list *newlist,
+				     const char **newname,
+				     struct mail_namespace **ns_r)
+{
+	struct mail_namespace *old_ns = oldlist->ns, *new_ns = newlist->ns;
+
+	if (shared_storage_get_namespace(&old_ns, oldname) < 0 ||
+	    shared_storage_get_namespace(&new_ns, newname) < 0)
+		return -1;
+	if (old_ns != new_ns) {
+		mailbox_list_set_error(oldlist, MAIL_ERROR_NOTPOSSIBLE,
+			"Can't rename shared mailboxes across storages.");
+		return -1;
+	}
+	*ns_r = old_ns;
+	return 0;
+}
+
+static int
+shared_list_rename_mailbox(struct mailbox_list *oldlist, const char *oldname,
+			   struct mailbox_list *newlist, const char *newname)
+{
+	struct mail_namespace *ns;
+	int ret;
+
+	if (shared_list_rename_get_ns(oldlist, &oldname,
+				      newlist, &newname, &ns) < 0)
+		return -1;
+
+	ret = ns->list->v.rename_mailbox(ns->list, oldname, ns->list, newname);
+	if (ret < 0)
+		shared_list_copy_error(oldlist, ns);
+	return ret;
+}
+
+struct mailbox_list shared_mailbox_list = {
+	.name = "shared",
+	.props = 0,
+	.mailbox_name_max_length = MAILBOX_LIST_NAME_MAX_LENGTH,
+
+	.v = {
+		.alloc = shared_list_alloc,
+		.deinit = shared_list_deinit,
+		.get_storage = shared_get_storage,
+		.get_hierarchy_sep = shared_list_get_hierarchy_sep,
+		.get_vname = mailbox_list_default_get_vname,
+		.get_storage_name = mailbox_list_default_get_storage_name,
+		.get_path = shared_list_get_path,
+		.get_temp_prefix = shared_list_get_temp_prefix,
+		.join_refpattern = shared_list_join_refpattern,
+		.iter_init = shared_list_iter_init,
+		.iter_next = shared_list_iter_next,
+		.iter_deinit = shared_list_iter_deinit,
+		.subscriptions_refresh = shared_list_subscriptions_refresh,
+		.set_subscribed = shared_list_set_subscribed,
+		.delete_mailbox = shared_list_delete_mailbox,
+		.delete_dir = shared_list_delete_dir,
+		.delete_symlink = shared_list_delete_symlink,
+		.rename_mailbox = shared_list_rename_mailbox,
+	}
+};
diff --git a/src/lib-storage/index/shared/shared-storage.c b/src/lib-storage/index/shared/shared-storage.c
new file mode 100644
index 0000000..978949e
--- /dev/null
+++ b/src/lib-storage/index/shared/shared-storage.c
@@ -0,0 +1,379 @@
+/* Copyright (c) 2008-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "ioloop.h"
+#include "var-expand.h"
+#include "index-storage.h"
+#include "mail-storage-service.h"
+#include "mailbox-list-private.h"
+#include "fail-mail-storage.h"
+#include "shared-storage.h"
+
+#include <ctype.h>
+
+extern struct mail_storage shared_storage;
+
+static struct mail_storage *shared_storage_alloc(void)
+{
+	struct shared_storage *storage;
+	pool_t pool;
+
+	pool = pool_alloconly_create("shared storage", 1024);
+	storage = p_new(pool, struct shared_storage, 1);
+	storage->storage = shared_storage;
+	storage->storage.pool = pool;
+	return &storage->storage;
+}
+
+static int
+shared_storage_create(struct mail_storage *_storage, struct mail_namespace *ns,
+		      const char **error_r)
+{
+	struct shared_storage *storage = SHARED_STORAGE(_storage);
+	const char *driver, *p;
+	char *wildcardp, key;
+	bool have_username;
+
+	/* location must begin with the actual mailbox driver */
+	p = strchr(ns->set->location, ':');
+	if (p == NULL) {
+		*error_r = "Shared mailbox location not prefixed with driver";
+		return -1;
+	}
+	driver = t_strdup_until(ns->set->location, p);
+	storage->location = p_strdup(_storage->pool, ns->set->location);
+	storage->unexpanded_location =
+		p_strdup(_storage->pool, ns->unexpanded_set->location);
+	storage->storage_class_name = p_strdup(_storage->pool, driver);
+
+	if (mail_user_get_storage_class(_storage->user, driver) == NULL &&
+	    strcmp(driver, "auto") != 0) {
+		*error_r = t_strconcat("Unknown shared storage driver: ",
+				       driver, NULL);
+		return -1;
+	}
+
+	wildcardp = strchr(ns->prefix, '%');
+	if (wildcardp == NULL) {
+		*error_r = "Shared namespace prefix doesn't contain %";
+		return -1;
+	}
+	storage->ns_prefix_pattern = p_strdup(_storage->pool, wildcardp);
+
+	have_username = FALSE;
+	for (p = storage->ns_prefix_pattern; *p != '\0'; p++) {
+		if (*p != '%')
+			continue;
+
+		key = p[1];
+		if (key == 'u' || key == 'n')
+			have_username = TRUE;
+		else if (key != '%' && key != 'd')
+			break;
+	}
+	if (*p != '\0') {
+		*error_r = "Shared namespace prefix contains unknown variables";
+		return -1;
+	}
+	if (!have_username) {
+		*error_r = "Shared namespace prefix doesn't contain %u or %n";
+		return -1;
+	}
+	if (p[-1] != mail_namespace_get_sep(ns) &&
+	    (ns->flags & (NAMESPACE_FLAG_LIST_PREFIX |
+			  NAMESPACE_FLAG_LIST_CHILDREN)) != 0) {
+		*error_r = "Shared namespace prefix doesn't end with hierarchy separator";
+		return -1;
+	}
+
+	/* truncate prefix after the above checks are done, so they can log
+	   the full prefix in error conditions */
+	*wildcardp = '\0';
+	ns->prefix_len = strlen(ns->prefix);
+	return 0;
+}
+
+static void
+shared_storage_get_list_settings(const struct mail_namespace *ns ATTR_UNUSED,
+				 struct mailbox_list_settings *set)
+{
+	set->layout = "shared";
+}
+
+static void
+get_nonexistent_user_location(struct shared_storage *storage,
+			      const char *username, string_t *location)
+{
+	/* user wasn't found. we'll still need to create the storage
+	   to avoid exposing which users exist and which don't. */
+	str_append(location, storage->storage_class_name);
+	str_append_c(location, ':');
+
+	/* use a reachable but nonexistent path as the mail root directory */
+	str_append(location, storage->storage.user->set->base_dir);
+	str_append(location, "/user-not-found/");
+	str_append(location, username);
+}
+
+static bool shared_namespace_exists(struct mail_namespace *ns)
+{
+	const char *path;
+	struct stat st;
+
+	if (!mailbox_list_get_root_path(ns->list, MAILBOX_LIST_PATH_TYPE_DIR,
+					&path)) {
+		/* we can't know if this exists */
+		return TRUE;
+	}
+	return stat(path, &st) == 0;
+}
+
+int shared_storage_get_namespace(struct mail_namespace **_ns,
+				 const char **_name)
+{
+	struct mail_storage *_storage = (*_ns)->storage;
+	struct mailbox_list *list = (*_ns)->list;
+	struct shared_storage *storage = SHARED_STORAGE(_storage);
+	struct mail_user *user = _storage->user;
+	struct mail_namespace *new_ns, *ns = *_ns;
+	struct mail_namespace_settings *ns_set, *unexpanded_ns_set;
+	struct mail_user *owner;
+	const char *domain = NULL, *username = NULL, *userdomain = NULL;
+	const char *name, *p, *next, **dest, *error;
+	string_t *prefix, *location;
+	char ns_sep = mail_namespace_get_sep(ns);
+	int ret;
+
+	p = storage->ns_prefix_pattern;
+	for (name = *_name; *p != '\0';) {
+		if (*p != '%') {
+			if (*p != *name)
+				break;
+			p++; name++;
+			continue;
+		}
+		switch (*++p) {
+		case 'd':
+			dest = &domain;
+			break;
+		case 'n':
+			dest = &username;
+			break;
+		case 'u':
+			dest = &userdomain;
+			break;
+		default:
+			/* we checked this already above */
+			i_unreached();
+		}
+		p++;
+
+		next = strchr(name, *p != '\0' ? *p : ns_sep);
+		if (next == NULL) {
+			*dest = name;
+			name = "";
+			break;
+		}
+		*dest = t_strdup_until(name, next);
+		name = next;
+	}
+	if (*p != '\0') {
+		if (*name == '\0' ||
+		    (name[1] == '\0' && *name == ns_sep)) {
+			/* trying to open <prefix>/<user> mailbox */
+			name = "INBOX";
+		} else {
+			mailbox_list_set_critical(list,
+					"Invalid namespace prefix %s vs %s",
+					storage->ns_prefix_pattern, *_name);
+			return -1;
+		}
+	}
+
+	/* successfully matched the name. */
+	if (userdomain != NULL) {
+		/* user@domain given */
+		domain = strchr(userdomain, '@');
+		if (domain == NULL)
+			username = userdomain;
+		else {
+			username = t_strdup_until(userdomain, domain);
+			domain++;
+		}
+	} else if (username == NULL) {
+		/* trying to open namespace "shared/domain"
+		   namespace prefix. */
+		mailbox_list_set_error(list, MAIL_ERROR_NOTFOUND,
+				       T_MAIL_ERR_MAILBOX_NOT_FOUND(*_name));
+		return -1;
+	} else {
+		if (domain == NULL) {
+			/* no domain given, use ours (if we have one) */
+			domain = i_strchr_to_next(user->username, '@');
+		}
+		userdomain = domain == NULL ? username :
+			t_strconcat(username, "@", domain, NULL);
+	}
+	if (*userdomain == '\0') {
+		mailbox_list_set_error(list, MAIL_ERROR_PARAMS,
+				       "Empty username doesn't exist");
+		return -1;
+	}
+
+	/* expand the namespace prefix and see if it already exists.
+	   this should normally happen only when the mailbox is being opened */
+	struct var_expand_table tab[] = {
+		{ 'u', userdomain, "user" },
+		{ 'n', username, "username" },
+		{ 'd', domain, "domain" },
+		{ 'h', NULL, "home" },
+		{ '\0', NULL, NULL }
+	};
+
+	prefix = t_str_new(128);
+	str_append(prefix, ns->prefix);
+	if (var_expand(prefix, storage->ns_prefix_pattern, tab, &error) <= 0) {
+		mailbox_list_set_critical(list,
+			"Failed to expand namespace prefix '%s': %s",
+			storage->ns_prefix_pattern, error);
+		return -1;
+	}
+
+	*_ns = mail_namespace_find_prefix(user->namespaces, str_c(prefix));
+	if (*_ns != NULL) {
+		*_name = mailbox_list_get_storage_name(ns->list,
+				t_strconcat(ns->prefix, name, NULL));
+		return 0;
+	}
+
+	owner = mail_user_alloc(event_get_parent(user->event), userdomain,
+				user->set_info, user->unexpanded_set);
+	owner->_service_user = user->_service_user;
+	mail_storage_service_user_ref(owner->_service_user);
+	owner->creator = user;
+	owner->autocreated = TRUE;
+	owner->session_id = p_strdup(owner->pool, user->session_id);
+	if (mail_user_init(owner, &error) < 0) {
+		if (!owner->nonexistent) {
+			mailbox_list_set_critical(list,
+				"Couldn't create namespace '%s' for user %s: %s",
+				ns->prefix, userdomain, error);
+			mail_user_deinit(&owner);
+			return -1;
+		}
+		ret = 0;
+	} else if (!var_has_key(storage->location, 'h', "home")) {
+		ret = 1;
+	} else {
+		/* we'll need to look up the user's home directory */
+		if ((ret = mail_user_get_home(owner, &tab[3].value)) < 0) {
+			mailbox_list_set_critical(list, "Namespace '%s': "
+				"Could not lookup home for user %s",
+				ns->prefix, userdomain);
+			mail_user_deinit(&owner);
+			return -1;
+		}
+	}
+
+	location = t_str_new(256);
+	if (ret > 0 &&
+	    var_expand(location, storage->location, tab, &error) <= 0) {
+		mailbox_list_set_critical(list,
+			"Failed to expand namespace location '%s': %s",
+			storage->location, error);
+		return -1;
+	}
+
+	/* create the new namespace */
+	new_ns = i_new(struct mail_namespace, 1);
+	new_ns->refcount = 1;
+	new_ns->type = MAIL_NAMESPACE_TYPE_SHARED;
+	new_ns->user = user;
+	new_ns->prefix = i_strdup(str_c(prefix));
+	new_ns->owner = owner;
+	new_ns->flags = (NAMESPACE_FLAG_SUBSCRIPTIONS & ns->flags) |
+		NAMESPACE_FLAG_LIST_PREFIX | NAMESPACE_FLAG_HIDDEN |
+		NAMESPACE_FLAG_AUTOCREATED | NAMESPACE_FLAG_INBOX_ANY;
+	new_ns->user_set = user->set;
+	new_ns->mail_set = _storage->set;
+	i_array_init(&new_ns->all_storages, 2);
+
+	if (ret <= 0) {
+		get_nonexistent_user_location(storage, userdomain, location);
+		new_ns->flags |= NAMESPACE_FLAG_UNUSABLE;
+		e_debug(ns->user->event,
+			"shared: Tried to access mails of "
+			"nonexistent user %s", userdomain);
+	}
+
+	ns_set = p_new(user->pool, struct mail_namespace_settings, 1);
+	ns_set->type = "shared";
+	ns_set->separator = p_strdup_printf(user->pool, "%c", ns_sep);
+	ns_set->prefix = new_ns->prefix;
+	ns_set->location = p_strdup(user->pool, str_c(location));
+	ns_set->hidden = TRUE;
+	ns_set->list = "yes";
+	new_ns->set = ns_set;
+
+	unexpanded_ns_set =
+		p_new(user->pool, struct mail_namespace_settings, 1);
+	*unexpanded_ns_set = *ns_set;
+	unexpanded_ns_set->location =
+		p_strdup(user->pool, storage->unexpanded_location);
+	new_ns->unexpanded_set = unexpanded_ns_set;
+
+	/* We need to create a prefix="" namespace for the owner */
+	if (mail_namespaces_init_location(owner, str_c(location), &error) < 0) {
+		/* owner gets freed by namespace deinit */
+		mail_namespace_destroy(new_ns);
+		return -1;
+	}
+
+	if (mail_storage_create(new_ns, NULL, _storage->flags |
+				MAIL_STORAGE_FLAG_NO_AUTOVERIFY, &error) < 0) {
+		mailbox_list_set_critical(list, "Namespace '%s': %s",
+					  new_ns->prefix, error);
+		/* owner gets freed by namespace deinit */
+		mail_namespace_destroy(new_ns);
+		return -1;
+	}
+	if ((new_ns->flags & NAMESPACE_FLAG_UNUSABLE) == 0 &&
+	    !shared_namespace_exists(new_ns)) {
+		/* this user doesn't have a usable storage */
+		new_ns->flags |= NAMESPACE_FLAG_UNUSABLE;
+	}
+	/* mark the shared namespace root as usable, since it now has
+	   child namespaces */
+	ns->flags |= NAMESPACE_FLAG_USABLE;
+	*_name = mailbox_list_get_storage_name(new_ns->list,
+				t_strconcat(new_ns->prefix, name, NULL));
+	*_ns = new_ns;
+	if (_storage->class_flags == 0) {
+		/* flags are unset if we were using "auto" storage */
+		_storage->class_flags =
+			mail_namespace_get_default_storage(new_ns)->class_flags;
+	}
+
+	mail_user_add_namespace(user, &new_ns);
+	return 0;
+}
+
+struct mail_storage shared_storage = {
+	.name = MAIL_SHARED_STORAGE_NAME,
+	.class_flags = 0, /* unknown at this point */
+
+	.v = {
+		NULL,
+		shared_storage_alloc,
+		shared_storage_create,
+		index_storage_destroy,
+		NULL,
+		shared_storage_get_list_settings,
+		NULL,
+		fail_mailbox_alloc,
+		NULL,
+		NULL,
+	}
+};
diff --git a/src/lib-storage/index/shared/shared-storage.h b/src/lib-storage/index/shared/shared-storage.h
new file mode 100644
index 0000000..5463b1c
--- /dev/null
+++ b/src/lib-storage/index/shared/shared-storage.h
@@ -0,0 +1,22 @@
+#ifndef SHARED_STORAGE_H
+#define SHARED_STORAGE_H
+
+struct shared_storage {
+	struct mail_storage storage;
+	union mailbox_list_module_context list_module_ctx;
+
+	const char *ns_prefix_pattern;
+	const char *location, *unexpanded_location;
+
+	const char *storage_class_name;
+};
+
+#define SHARED_STORAGE(s)	container_of(s, struct shared_storage, storage)
+
+struct mailbox_list *shared_mailbox_list_alloc(void);
+
+/* Returns -1 = error, 0 = user doesn't exist, 1 = ok */
+int shared_storage_get_namespace(struct mail_namespace **_ns,
+				 const char **_name);
+
+#endif