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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* config-parser.c XML-library-agnostic configuration file parser
*
* Copyright (C) 2003, 2004 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <config.h>
#include "config-parser-common.h"
#include "config-parser.h"
#include "test.h"
#include "utils.h"
#include "policy.h"
#include "selinux.h"
#include <dbus/dbus-list.h>
#include <dbus/dbus-internals.h>
#include <dbus/dbus-sysdeps.h>
#include <string.h>
typedef enum
{
/* we ignore policies for unknown groups/users */
POLICY_IGNORED,
/* non-ignored */
POLICY_DEFAULT,
POLICY_MANDATORY,
POLICY_USER,
POLICY_GROUP,
POLICY_CONSOLE
} PolicyType;
typedef struct
{
ElementType type;
unsigned int had_content : 1;
union
{
struct
{
unsigned int ignore_missing : 1;
unsigned int if_selinux_enabled : 1;
unsigned int selinux_root_relative : 1;
} include;
struct
{
PolicyType type;
unsigned long gid_uid_or_at_console;
} policy;
struct
{
char *name;
long value;
} limit;
} d;
} Element;
/**
* Parser for bus configuration file.
*/
struct BusConfigParser
{
int refcount; /**< Reference count */
DBusString basedir; /**< Directory we resolve paths relative to */
DBusList *stack; /**< stack of Element */
char *user; /**< user to run as */
char *servicehelper; /**< location of the setuid helper */
char *bus_type; /**< Message bus type */
DBusList *listen_on; /**< List of addresses to listen to */
DBusList *mechanisms; /**< Auth mechanisms */
DBusList *service_dirs; /**< Directories to look for session services in */
DBusList *conf_dirs; /**< Directories to look for policy configuration in */
BusPolicy *policy; /**< Security policy */
BusLimits limits; /**< Limits */
char *pidfile; /**< PID file */
DBusList *included_files; /**< Included files stack */
DBusHashTable *service_context_table; /**< Map service names to SELinux contexts */
unsigned int fork : 1; /**< TRUE to fork into daemon mode */
unsigned int syslog : 1; /**< TRUE to enable syslog */
unsigned int keep_umask : 1; /**< TRUE to keep original umask when forking */
unsigned int is_toplevel : 1; /**< FALSE if we are a sub-config-file inside another one */
unsigned int allow_anonymous : 1; /**< TRUE to allow anonymous connections */
};
static Element*
push_element (BusConfigParser *parser,
ElementType type)
{
Element *e;
_dbus_assert (type != ELEMENT_NONE);
e = dbus_new0 (Element, 1);
if (e == NULL)
return NULL;
if (!_dbus_list_append (&parser->stack, e))
{
dbus_free (e);
return NULL;
}
e->type = type;
return e;
}
static void
element_free (Element *e)
{
if (e->type == ELEMENT_LIMIT)
dbus_free (e->d.limit.name);
dbus_free (e);
}
static void
pop_element (BusConfigParser *parser)
{
Element *e;
e = _dbus_list_pop_last (&parser->stack);
element_free (e);
}
static Element*
peek_element (BusConfigParser *parser)
{
Element *e;
e = _dbus_list_get_last (&parser->stack);
return e;
}
static ElementType
top_element_type (BusConfigParser *parser)
{
Element *e;
e = _dbus_list_get_last (&parser->stack);
if (e)
return e->type;
else
return ELEMENT_NONE;
}
static dbus_bool_t
merge_service_context_hash (DBusHashTable *dest,
DBusHashTable *from)
{
DBusHashIter iter;
char *service_copy;
char *context_copy;
service_copy = NULL;
context_copy = NULL;
_dbus_hash_iter_init (from, &iter);
while (_dbus_hash_iter_next (&iter))
{
const char *service = _dbus_hash_iter_get_string_key (&iter);
const char *context = _dbus_hash_iter_get_value (&iter);
service_copy = _dbus_strdup (service);
if (service_copy == NULL)
goto fail;
context_copy = _dbus_strdup (context);
if (context_copy == NULL)
goto fail;
if (!_dbus_hash_table_insert_string (dest, service_copy, context_copy))
goto fail;
service_copy = NULL;
context_copy = NULL;
}
return TRUE;
fail:
if (service_copy)
dbus_free (service_copy);
if (context_copy)
dbus_free (context_copy);
return FALSE;
}
static dbus_bool_t
service_dirs_find_dir (DBusList **service_dirs,
const char *dir)
{
DBusList *link;
_dbus_assert (dir != NULL);
for (link = *service_dirs; link; link = _dbus_list_get_next_link(service_dirs, link))
{
const char *link_dir;
link_dir = (const char *)link->data;
if (strcmp (dir, link_dir) == 0)
return TRUE;
}
return FALSE;
}
static dbus_bool_t
service_dirs_append_unique_or_free (DBusList **service_dirs,
char *dir)
{
if (!service_dirs_find_dir (service_dirs, dir))
return _dbus_list_append (service_dirs, dir);
dbus_free (dir);
return TRUE;
}
static void
service_dirs_append_link_unique_or_free (DBusList **service_dirs,
DBusList *dir_link)
{
if (!service_dirs_find_dir (service_dirs, dir_link->data))
{
_dbus_list_append_link (service_dirs, dir_link);
}
else
{
dbus_free (dir_link->data);
_dbus_list_free_link (dir_link);
}
}
static dbus_bool_t
merge_included (BusConfigParser *parser,
BusConfigParser *included,
DBusError *error)
{
DBusList *link;
if (!bus_policy_merge (parser->policy,
included->policy))
{
BUS_SET_OOM (error);
return FALSE;
}
if (!merge_service_context_hash (parser->service_context_table,
included->service_context_table))
{
BUS_SET_OOM (error);
return FALSE;
}
if (included->user != NULL)
{
dbus_free (parser->user);
parser->user = included->user;
included->user = NULL;
}
if (included->bus_type != NULL)
{
dbus_free (parser->bus_type);
parser->bus_type = included->bus_type;
included->bus_type = NULL;
}
if (included->fork)
parser->fork = TRUE;
if (included->keep_umask)
parser->keep_umask = TRUE;
if (included->pidfile != NULL)
{
dbus_free (parser->pidfile);
parser->pidfile = included->pidfile;
included->pidfile = NULL;
}
while ((link = _dbus_list_pop_first_link (&included->listen_on)))
_dbus_list_append_link (&parser->listen_on, link);
while ((link = _dbus_list_pop_first_link (&included->mechanisms)))
_dbus_list_append_link (&parser->mechanisms, link);
while ((link = _dbus_list_pop_first_link (&included->service_dirs)))
service_dirs_append_link_unique_or_free (&parser->service_dirs, link);
while ((link = _dbus_list_pop_first_link (&included->conf_dirs)))
_dbus_list_append_link (&parser->conf_dirs, link);
return TRUE;
}
static dbus_bool_t
seen_include (BusConfigParser *parser,
const DBusString *file)
{
DBusList *iter;
iter = parser->included_files;
while (iter != NULL)
{
if (! strcmp (_dbus_string_get_const_data (file), iter->data))
return TRUE;
iter = _dbus_list_get_next_link (&parser->included_files, iter);
}
return FALSE;
}
BusConfigParser*
bus_config_parser_new (const DBusString *basedir,
dbus_bool_t is_toplevel,
const BusConfigParser *parent)
{
BusConfigParser *parser;
parser = dbus_new0 (BusConfigParser, 1);
if (parser == NULL)
return NULL;
parser->is_toplevel = !!is_toplevel;
if (!_dbus_string_init (&parser->basedir))
{
dbus_free (parser);
return NULL;
}
if (((parser->policy = bus_policy_new ()) == NULL) ||
!_dbus_string_copy (basedir, 0, &parser->basedir, 0) ||
((parser->service_context_table = _dbus_hash_table_new (DBUS_HASH_STRING,
dbus_free,
dbus_free)) == NULL))
{
if (parser->policy)
bus_policy_unref (parser->policy);
_dbus_string_free (&parser->basedir);
dbus_free (parser);
return NULL;
}
if (parent != NULL)
{
/* Initialize the parser's limits from the parent. */
parser->limits = parent->limits;
/* Use the parent's list of included_files to avoid
circular inclusions. */
parser->included_files = parent->included_files;
}
else
{
/* Make up some numbers! woot! */
parser->limits.max_incoming_bytes = _DBUS_ONE_MEGABYTE * 127;
parser->limits.max_outgoing_bytes = _DBUS_ONE_MEGABYTE * 127;
parser->limits.max_message_size = _DBUS_ONE_MEGABYTE * 32;
/* We set relatively conservative values here since due to the
way SCM_RIGHTS works we need to preallocate an array for the
maximum number of file descriptors we can receive. Picking a
high value here thus translates directly to more memory
allocation. */
parser->limits.max_incoming_unix_fds = 1024*4;
parser->limits.max_outgoing_unix_fds = 1024*4;
parser->limits.max_message_unix_fds = 1024;
/* Making this long means the user has to wait longer for an error
* message if something screws up, but making it too short means
* they might see a false failure.
*/
parser->limits.activation_timeout = 25000; /* 25 seconds */
/* Making this long risks making a DOS attack easier, but too short
* and legitimate auth will fail. If interactive auth (ask user for
* password) is allowed, then potentially it has to be quite long.
*/
parser->limits.auth_timeout = 30000; /* 30 seconds */
parser->limits.max_incomplete_connections = 64;
parser->limits.max_connections_per_user = 256;
/* Note that max_completed_connections / max_connections_per_user
* is the number of users that would have to work together to
* DOS all the other users.
*/
parser->limits.max_completed_connections = 2048;
parser->limits.max_pending_activations = 512;
parser->limits.max_services_per_connection = 512;
/* For this one, keep in mind that it isn't only the memory used
* by the match rules, but slowdown from linearly walking a big
* list of them. A client adding more than this is almost
* certainly a bad idea for that reason, and should change to a
* smaller number of wider-net match rules - getting every last
* message to the bus is probably better than having a thousand
* match rules.
*/
parser->limits.max_match_rules_per_connection = 512;
parser->limits.reply_timeout = -1; /* never */
/* this is effectively a limit on message queue size for messages
* that require a reply
*/
parser->limits.max_replies_per_connection = 1024*8;
}
parser->refcount = 1;
return parser;
}
BusConfigParser *
bus_config_parser_ref (BusConfigParser *parser)
{
_dbus_assert (parser->refcount > 0);
parser->refcount += 1;
return parser;
}
void
bus_config_parser_unref (BusConfigParser *parser)
{
_dbus_assert (parser->refcount > 0);
parser->refcount -= 1;
if (parser->refcount == 0)
{
while (parser->stack != NULL)
pop_element (parser);
dbus_free (parser->user);
dbus_free (parser->servicehelper);
dbus_free (parser->bus_type);
dbus_free (parser->pidfile);
_dbus_list_foreach (&parser->listen_on,
(DBusForeachFunction) dbus_free,
NULL);
_dbus_list_clear (&parser->listen_on);
_dbus_list_foreach (&parser->service_dirs,
(DBusForeachFunction) dbus_free,
NULL);
_dbus_list_clear (&parser->service_dirs);
_dbus_list_foreach (&parser->conf_dirs,
(DBusForeachFunction) dbus_free,
NULL);
_dbus_list_clear (&parser->conf_dirs);
_dbus_list_foreach (&parser->mechanisms,
(DBusForeachFunction) dbus_free,
NULL);
_dbus_list_clear (&parser->mechanisms);
_dbus_string_free (&parser->basedir);
if (parser->policy)
bus_policy_unref (parser->policy);
if (parser->service_context_table)
_dbus_hash_table_unref (parser->service_context_table);
dbus_free (parser);
}
}
dbus_bool_t
bus_config_parser_check_doctype (BusConfigParser *parser,
const char *doctype,
DBusError *error)
{
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
if (strcmp (doctype, "busconfig") != 0)
{
dbus_set_error (error,
DBUS_ERROR_FAILED,
"Configuration file has the wrong document type %s",
doctype);
return FALSE;
}
else
return TRUE;
}
typedef struct
{
const char *name;
const char **retloc;
} LocateAttr;
static dbus_bool_t
locate_attributes (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error,
const char *first_attribute_name,
const char **first_attribute_retloc,
...)
{
va_list args;
const char *name;
const char **retloc;
int n_attrs;
#define MAX_ATTRS 24
LocateAttr attrs[MAX_ATTRS];
dbus_bool_t retval;
int i;
_dbus_assert (first_attribute_name != NULL);
_dbus_assert (first_attribute_retloc != NULL);
retval = TRUE;
n_attrs = 1;
attrs[0].name = first_attribute_name;
attrs[0].retloc = first_attribute_retloc;
*first_attribute_retloc = NULL;
va_start (args, first_attribute_retloc);
name = va_arg (args, const char*);
retloc = va_arg (args, const char**);
while (name != NULL)
{
_dbus_assert (retloc != NULL);
_dbus_assert (n_attrs < MAX_ATTRS);
attrs[n_attrs].name = name;
attrs[n_attrs].retloc = retloc;
n_attrs += 1;
*retloc = NULL;
name = va_arg (args, const char*);
retloc = va_arg (args, const char**);
}
va_end (args);
i = 0;
while (attribute_names[i])
{
int j;
dbus_bool_t found;
found = FALSE;
j = 0;
while (j < n_attrs)
{
if (strcmp (attrs[j].name, attribute_names[i]) == 0)
{
retloc = attrs[j].retloc;
if (*retloc != NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Attribute \"%s\" repeated twice on the same <%s> element",
attrs[j].name, element_name);
retval = FALSE;
goto out;
}
*retloc = attribute_values[i];
found = TRUE;
}
++j;
}
if (!found)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Attribute \"%s\" is invalid on <%s> element in this context",
attribute_names[i], element_name);
retval = FALSE;
goto out;
}
++i;
}
out:
return retval;
}
static dbus_bool_t
check_no_attributes (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error)
{
if (attribute_names[0] != NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Attribute \"%s\" is invalid on <%s> element in this context",
attribute_names[0], element_name);
return FALSE;
}
return TRUE;
}
static dbus_bool_t
start_busconfig_child (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error)
{
ElementType element_type;
element_type = bus_config_parser_element_name_to_type (element_name);
if (element_type == ELEMENT_USER)
{
if (!check_no_attributes (parser, "user", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_USER) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_CONFIGTYPE)
{
if (!check_no_attributes (parser, "type", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_CONFIGTYPE) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_FORK)
{
if (!check_no_attributes (parser, "fork", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_FORK) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
parser->fork = TRUE;
return TRUE;
}
else if (element_type == ELEMENT_SYSLOG)
{
if (!check_no_attributes (parser, "syslog", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_SYSLOG) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
parser->syslog = TRUE;
return TRUE;
}
else if (element_type == ELEMENT_KEEP_UMASK)
{
if (!check_no_attributes (parser, "keep_umask", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_KEEP_UMASK) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
parser->keep_umask = TRUE;
return TRUE;
}
else if (element_type == ELEMENT_PIDFILE)
{
if (!check_no_attributes (parser, "pidfile", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_PIDFILE) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_LISTEN)
{
if (!check_no_attributes (parser, "listen", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_LISTEN) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_AUTH)
{
if (!check_no_attributes (parser, "auth", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_AUTH) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_SERVICEHELPER)
{
if (!check_no_attributes (parser, "servicehelper", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_SERVICEHELPER) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_INCLUDEDIR)
{
if (!check_no_attributes (parser, "includedir", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_INCLUDEDIR) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_STANDARD_SESSION_SERVICEDIRS)
{
DBusList *link;
DBusList *dirs;
dirs = NULL;
if (!check_no_attributes (parser, "standard_session_servicedirs", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_STANDARD_SESSION_SERVICEDIRS) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
if (!_dbus_get_standard_session_servicedirs (&dirs))
{
BUS_SET_OOM (error);
return FALSE;
}
while ((link = _dbus_list_pop_first_link (&dirs)))
service_dirs_append_link_unique_or_free (&parser->service_dirs, link);
return TRUE;
}
else if (element_type == ELEMENT_STANDARD_SYSTEM_SERVICEDIRS)
{
DBusList *link;
DBusList *dirs;
dirs = NULL;
if (!check_no_attributes (parser, "standard_system_servicedirs", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_STANDARD_SYSTEM_SERVICEDIRS) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
if (!_dbus_get_standard_system_servicedirs (&dirs))
{
BUS_SET_OOM (error);
return FALSE;
}
while ((link = _dbus_list_pop_first_link (&dirs)))
service_dirs_append_link_unique_or_free (&parser->service_dirs, link);
return TRUE;
}
else if (element_type == ELEMENT_ALLOW_ANONYMOUS)
{
if (!check_no_attributes (parser, "allow_anonymous", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_ALLOW_ANONYMOUS) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
parser->allow_anonymous = TRUE;
return TRUE;
}
else if (element_type == ELEMENT_SERVICEDIR)
{
if (!check_no_attributes (parser, "servicedir", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_SERVICEDIR) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_INCLUDE)
{
Element *e;
const char *if_selinux_enabled;
const char *ignore_missing;
const char *selinux_root_relative;
if ((e = push_element (parser, ELEMENT_INCLUDE)) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
e->d.include.ignore_missing = FALSE;
e->d.include.if_selinux_enabled = FALSE;
e->d.include.selinux_root_relative = FALSE;
if (!locate_attributes (parser, "include",
attribute_names,
attribute_values,
error,
"ignore_missing", &ignore_missing,
"if_selinux_enabled", &if_selinux_enabled,
"selinux_root_relative", &selinux_root_relative,
NULL))
return FALSE;
if (ignore_missing != NULL)
{
if (strcmp (ignore_missing, "yes") == 0)
e->d.include.ignore_missing = TRUE;
else if (strcmp (ignore_missing, "no") == 0)
e->d.include.ignore_missing = FALSE;
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"ignore_missing attribute must have value \"yes\" or \"no\"");
return FALSE;
}
}
if (if_selinux_enabled != NULL)
{
if (strcmp (if_selinux_enabled, "yes") == 0)
e->d.include.if_selinux_enabled = TRUE;
else if (strcmp (if_selinux_enabled, "no") == 0)
e->d.include.if_selinux_enabled = FALSE;
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"if_selinux_enabled attribute must have value"
" \"yes\" or \"no\"");
return FALSE;
}
}
if (selinux_root_relative != NULL)
{
if (strcmp (selinux_root_relative, "yes") == 0)
e->d.include.selinux_root_relative = TRUE;
else if (strcmp (selinux_root_relative, "no") == 0)
e->d.include.selinux_root_relative = FALSE;
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"selinux_root_relative attribute must have value"
" \"yes\" or \"no\"");
return FALSE;
}
}
return TRUE;
}
else if (element_type == ELEMENT_POLICY)
{
Element *e;
const char *context;
const char *user;
const char *group;
const char *at_console;
if ((e = push_element (parser, ELEMENT_POLICY)) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
e->d.policy.type = POLICY_IGNORED;
if (!locate_attributes (parser, "policy",
attribute_names,
attribute_values,
error,
"context", &context,
"user", &user,
"group", &group,
"at_console", &at_console,
NULL))
return FALSE;
if (((context && user) ||
(context && group) ||
(context && at_console)) ||
((user && group) ||
(user && at_console)) ||
(group && at_console) ||
!(context || user || group || at_console))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<policy> element must have exactly one of (context|user|group|at_console) attributes");
return FALSE;
}
if (context != NULL)
{
if (strcmp (context, "default") == 0)
{
e->d.policy.type = POLICY_DEFAULT;
}
else if (strcmp (context, "mandatory") == 0)
{
e->d.policy.type = POLICY_MANDATORY;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"context attribute on <policy> must have the value \"default\" or \"mandatory\", not \"%s\"",
context);
return FALSE;
}
}
else if (user != NULL)
{
DBusString username;
_dbus_string_init_const (&username, user);
if (_dbus_parse_unix_user_from_config (&username,
&e->d.policy.gid_uid_or_at_console))
e->d.policy.type = POLICY_USER;
else
_dbus_warn ("Unknown username \"%s\" in message bus configuration file\n",
user);
}
else if (group != NULL)
{
DBusString group_name;
_dbus_string_init_const (&group_name, group);
if (_dbus_parse_unix_group_from_config (&group_name,
&e->d.policy.gid_uid_or_at_console))
e->d.policy.type = POLICY_GROUP;
else
_dbus_warn ("Unknown group \"%s\" in message bus configuration file\n",
group);
}
else if (at_console != NULL)
{
dbus_bool_t t;
t = (strcmp (at_console, "true") == 0);
if (t || strcmp (at_console, "false") == 0)
{
e->d.policy.gid_uid_or_at_console = t;
e->d.policy.type = POLICY_CONSOLE;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Unknown value \"%s\" for at_console in message bus configuration file",
at_console);
return FALSE;
}
}
else
{
_dbus_assert_not_reached ("all <policy> attributes null and we didn't set error");
}
return TRUE;
}
else if (element_type == ELEMENT_LIMIT)
{
Element *e;
const char *name;
if ((e = push_element (parser, ELEMENT_LIMIT)) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
if (!locate_attributes (parser, "limit",
attribute_names,
attribute_values,
error,
"name", &name,
NULL))
return FALSE;
if (name == NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<limit> element must have a \"name\" attribute");
return FALSE;
}
e->d.limit.name = _dbus_strdup (name);
if (e->d.limit.name == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (element_type == ELEMENT_SELINUX)
{
if (!check_no_attributes (parser, "selinux", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_SELINUX) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> not allowed inside <%s> in configuration file",
element_name, "busconfig");
return FALSE;
}
}
static dbus_bool_t
append_rule_from_element (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
dbus_bool_t allow,
DBusError *error)
{
const char *log;
const char *send_interface;
const char *send_member;
const char *send_error;
const char *send_destination;
const char *send_path;
const char *send_type;
const char *receive_interface;
const char *receive_member;
const char *receive_error;
const char *receive_sender;
const char *receive_path;
const char *receive_type;
const char *eavesdrop;
const char *send_requested_reply;
const char *receive_requested_reply;
const char *own;
const char *own_prefix;
const char *user;
const char *group;
BusPolicyRule *rule;
if (!locate_attributes (parser, element_name,
attribute_names,
attribute_values,
error,
"send_interface", &send_interface,
"send_member", &send_member,
"send_error", &send_error,
"send_destination", &send_destination,
"send_path", &send_path,
"send_type", &send_type,
"receive_interface", &receive_interface,
"receive_member", &receive_member,
"receive_error", &receive_error,
"receive_sender", &receive_sender,
"receive_path", &receive_path,
"receive_type", &receive_type,
"eavesdrop", &eavesdrop,
"send_requested_reply", &send_requested_reply,
"receive_requested_reply", &receive_requested_reply,
"own", &own,
"own_prefix", &own_prefix,
"user", &user,
"group", &group,
"log", &log,
NULL))
return FALSE;
if (!(send_interface || send_member || send_error || send_destination ||
send_type || send_path ||
receive_interface || receive_member || receive_error || receive_sender ||
receive_type || receive_path || eavesdrop ||
send_requested_reply || receive_requested_reply ||
own || own_prefix || user || group))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> must have one or more attributes",
element_name);
return FALSE;
}
if ((send_member && (send_interface == NULL && send_path == NULL)) ||
(receive_member && (receive_interface == NULL && receive_path == NULL)))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"On element <%s>, if you specify a member you must specify an interface or a path. Keep in mind that not all messages have an interface field.",
element_name);
return FALSE;
}
/* Allowed combinations of elements are:
*
* base, must be all send or all receive:
* nothing
* interface
* interface + member
* error
*
* base send_ can combine with send_destination, send_path, send_type, send_requested_reply
* base receive_ with receive_sender, receive_path, receive_type, receive_requested_reply, eavesdrop
*
* user, group, own, own_prefix must occur alone
*
* Pretty sure the below stuff is broken, FIXME think about it more.
*/
if ((send_interface && (send_error ||
receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_member && (send_error ||
receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_error && (receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_destination && (receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_type && (receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_path && (receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(send_requested_reply && (receive_interface ||
receive_member ||
receive_error ||
receive_sender ||
receive_requested_reply ||
own || own_prefix ||
user ||
group)) ||
(receive_interface && (receive_error ||
own || own_prefix ||
user ||
group)) ||
(receive_member && (receive_error ||
own || own_prefix ||
user ||
group)) ||
(receive_error && (own || own_prefix ||
user ||
group)) ||
(eavesdrop && (own || own_prefix ||
user ||
group)) ||
(receive_requested_reply && (own || own_prefix ||
user ||
group)) ||
(own && (own_prefix || user || group)) ||
(own_prefix && (own || user || group)) ||
(user && group))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Invalid combination of attributes on element <%s>",
element_name);
return FALSE;
}
rule = NULL;
/* In BusPolicyRule, NULL represents wildcard.
* In the config file, '*' represents it.
*/
#define IS_WILDCARD(str) ((str) && ((str)[0]) == '*' && ((str)[1]) == '\0')
if (send_interface || send_member || send_error || send_destination ||
send_path || send_type || send_requested_reply)
{
int message_type;
if (IS_WILDCARD (send_interface))
send_interface = NULL;
if (IS_WILDCARD (send_member))
send_member = NULL;
if (IS_WILDCARD (send_error))
send_error = NULL;
if (IS_WILDCARD (send_destination))
send_destination = NULL;
if (IS_WILDCARD (send_path))
send_path = NULL;
if (IS_WILDCARD (send_type))
send_type = NULL;
message_type = DBUS_MESSAGE_TYPE_INVALID;
if (send_type != NULL)
{
message_type = dbus_message_type_from_string (send_type);
if (message_type == DBUS_MESSAGE_TYPE_INVALID)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad message type \"%s\"",
send_type);
return FALSE;
}
}
if (eavesdrop &&
!(strcmp (eavesdrop, "true") == 0 ||
strcmp (eavesdrop, "false") == 0))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad value \"%s\" for %s attribute, must be true or false",
"eavesdrop", eavesdrop);
return FALSE;
}
if (send_requested_reply &&
!(strcmp (send_requested_reply, "true") == 0 ||
strcmp (send_requested_reply, "false") == 0))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad value \"%s\" for %s attribute, must be true or false",
"send_requested_reply", send_requested_reply);
return FALSE;
}
rule = bus_policy_rule_new (BUS_POLICY_RULE_SEND, allow);
if (rule == NULL)
goto nomem;
if (eavesdrop)
rule->d.send.eavesdrop = (strcmp (eavesdrop, "true") == 0);
if (log)
rule->d.send.log = (strcmp (log, "true") == 0);
if (send_requested_reply)
rule->d.send.requested_reply = (strcmp (send_requested_reply, "true") == 0);
rule->d.send.message_type = message_type;
rule->d.send.path = _dbus_strdup (send_path);
rule->d.send.interface = _dbus_strdup (send_interface);
rule->d.send.member = _dbus_strdup (send_member);
rule->d.send.error = _dbus_strdup (send_error);
rule->d.send.destination = _dbus_strdup (send_destination);
if (send_path && rule->d.send.path == NULL)
goto nomem;
if (send_interface && rule->d.send.interface == NULL)
goto nomem;
if (send_member && rule->d.send.member == NULL)
goto nomem;
if (send_error && rule->d.send.error == NULL)
goto nomem;
if (send_destination && rule->d.send.destination == NULL)
goto nomem;
}
else if (receive_interface || receive_member || receive_error || receive_sender ||
receive_path || receive_type || eavesdrop || receive_requested_reply)
{
int message_type;
if (IS_WILDCARD (receive_interface))
receive_interface = NULL;
if (IS_WILDCARD (receive_member))
receive_member = NULL;
if (IS_WILDCARD (receive_error))
receive_error = NULL;
if (IS_WILDCARD (receive_sender))
receive_sender = NULL;
if (IS_WILDCARD (receive_path))
receive_path = NULL;
if (IS_WILDCARD (receive_type))
receive_type = NULL;
message_type = DBUS_MESSAGE_TYPE_INVALID;
if (receive_type != NULL)
{
message_type = dbus_message_type_from_string (receive_type);
if (message_type == DBUS_MESSAGE_TYPE_INVALID)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad message type \"%s\"",
receive_type);
return FALSE;
}
}
if (eavesdrop &&
!(strcmp (eavesdrop, "true") == 0 ||
strcmp (eavesdrop, "false") == 0))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad value \"%s\" for %s attribute, must be true or false",
"eavesdrop", eavesdrop);
return FALSE;
}
if (receive_requested_reply &&
!(strcmp (receive_requested_reply, "true") == 0 ||
strcmp (receive_requested_reply, "false") == 0))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Bad value \"%s\" for %s attribute, must be true or false",
"receive_requested_reply", receive_requested_reply);
return FALSE;
}
rule = bus_policy_rule_new (BUS_POLICY_RULE_RECEIVE, allow);
if (rule == NULL)
goto nomem;
if (eavesdrop)
rule->d.receive.eavesdrop = (strcmp (eavesdrop, "true") == 0);
if (receive_requested_reply)
rule->d.receive.requested_reply = (strcmp (receive_requested_reply, "true") == 0);
rule->d.receive.message_type = message_type;
rule->d.receive.path = _dbus_strdup (receive_path);
rule->d.receive.interface = _dbus_strdup (receive_interface);
rule->d.receive.member = _dbus_strdup (receive_member);
rule->d.receive.error = _dbus_strdup (receive_error);
rule->d.receive.origin = _dbus_strdup (receive_sender);
if (receive_path && rule->d.receive.path == NULL)
goto nomem;
if (receive_interface && rule->d.receive.interface == NULL)
goto nomem;
if (receive_member && rule->d.receive.member == NULL)
goto nomem;
if (receive_error && rule->d.receive.error == NULL)
goto nomem;
if (receive_sender && rule->d.receive.origin == NULL)
goto nomem;
}
else if (own || own_prefix)
{
rule = bus_policy_rule_new (BUS_POLICY_RULE_OWN, allow);
if (rule == NULL)
goto nomem;
if (own)
{
if (IS_WILDCARD (own))
own = NULL;
rule->d.own.prefix = 0;
rule->d.own.service_name = _dbus_strdup (own);
if (own && rule->d.own.service_name == NULL)
goto nomem;
}
else
{
rule->d.own.prefix = 1;
rule->d.own.service_name = _dbus_strdup (own_prefix);
if (rule->d.own.service_name == NULL)
goto nomem;
}
}
else if (user)
{
if (IS_WILDCARD (user))
{
rule = bus_policy_rule_new (BUS_POLICY_RULE_USER, allow);
if (rule == NULL)
goto nomem;
rule->d.user.uid = DBUS_UID_UNSET;
}
else
{
DBusString username;
dbus_uid_t uid;
_dbus_string_init_const (&username, user);
if (_dbus_parse_unix_user_from_config (&username, &uid))
{
rule = bus_policy_rule_new (BUS_POLICY_RULE_USER, allow);
if (rule == NULL)
goto nomem;
rule->d.user.uid = uid;
}
else
{
_dbus_warn ("Unknown username \"%s\" on element <%s>\n",
user, element_name);
}
}
}
else if (group)
{
if (IS_WILDCARD (group))
{
rule = bus_policy_rule_new (BUS_POLICY_RULE_GROUP, allow);
if (rule == NULL)
goto nomem;
rule->d.group.gid = DBUS_GID_UNSET;
}
else
{
DBusString groupname;
dbus_gid_t gid;
_dbus_string_init_const (&groupname, group);
if (_dbus_parse_unix_group_from_config (&groupname, &gid))
{
rule = bus_policy_rule_new (BUS_POLICY_RULE_GROUP, allow);
if (rule == NULL)
goto nomem;
rule->d.group.gid = gid;
}
else
{
_dbus_warn ("Unknown group \"%s\" on element <%s>\n",
group, element_name);
}
}
}
else
_dbus_assert_not_reached ("Did not handle some combination of attributes on <allow> or <deny>");
if (rule != NULL)
{
Element *pe;
pe = peek_element (parser);
_dbus_assert (pe != NULL);
_dbus_assert (pe->type == ELEMENT_POLICY);
switch (pe->d.policy.type)
{
case POLICY_IGNORED:
/* drop the rule on the floor */
break;
case POLICY_DEFAULT:
if (!bus_policy_append_default_rule (parser->policy, rule))
goto nomem;
break;
case POLICY_MANDATORY:
if (!bus_policy_append_mandatory_rule (parser->policy, rule))
goto nomem;
break;
case POLICY_USER:
if (!BUS_POLICY_RULE_IS_PER_CLIENT (rule))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<%s> rule cannot be per-user because it has bus-global semantics",
element_name);
goto failed;
}
if (!bus_policy_append_user_rule (parser->policy, pe->d.policy.gid_uid_or_at_console,
rule))
goto nomem;
break;
case POLICY_GROUP:
if (!BUS_POLICY_RULE_IS_PER_CLIENT (rule))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<%s> rule cannot be per-group because it has bus-global semantics",
element_name);
goto failed;
}
if (!bus_policy_append_group_rule (parser->policy, pe->d.policy.gid_uid_or_at_console,
rule))
goto nomem;
break;
case POLICY_CONSOLE:
if (!bus_policy_append_console_rule (parser->policy, pe->d.policy.gid_uid_or_at_console,
rule))
goto nomem;
break;
}
bus_policy_rule_unref (rule);
rule = NULL;
}
return TRUE;
nomem:
BUS_SET_OOM (error);
failed:
if (rule)
bus_policy_rule_unref (rule);
return FALSE;
}
static dbus_bool_t
start_policy_child (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error)
{
if (strcmp (element_name, "allow") == 0)
{
if (!append_rule_from_element (parser, element_name,
attribute_names, attribute_values,
TRUE, error))
return FALSE;
if (push_element (parser, ELEMENT_ALLOW) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else if (strcmp (element_name, "deny") == 0)
{
if (!append_rule_from_element (parser, element_name,
attribute_names, attribute_values,
FALSE, error))
return FALSE;
if (push_element (parser, ELEMENT_DENY) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> not allowed inside <%s> in configuration file",
element_name, "policy");
return FALSE;
}
}
static dbus_bool_t
start_selinux_child (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error)
{
char *own_copy;
char *context_copy;
own_copy = NULL;
context_copy = NULL;
if (strcmp (element_name, "associate") == 0)
{
const char *own;
const char *context;
if (!locate_attributes (parser, "associate",
attribute_names,
attribute_values,
error,
"own", &own,
"context", &context,
NULL))
return FALSE;
if (push_element (parser, ELEMENT_ASSOCIATE) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
if (own == NULL || context == NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <associate> must have attributes own=\"<servicename>\" and context=\"<selinux context>\"");
return FALSE;
}
own_copy = _dbus_strdup (own);
if (own_copy == NULL)
goto oom;
context_copy = _dbus_strdup (context);
if (context_copy == NULL)
goto oom;
if (!_dbus_hash_table_insert_string (parser->service_context_table,
own_copy, context_copy))
goto oom;
return TRUE;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> not allowed inside <%s> in configuration file",
element_name, "selinux");
return FALSE;
}
oom:
if (own_copy)
dbus_free (own_copy);
if (context_copy)
dbus_free (context_copy);
BUS_SET_OOM (error);
return FALSE;
}
dbus_bool_t
bus_config_parser_start_element (BusConfigParser *parser,
const char *element_name,
const char **attribute_names,
const char **attribute_values,
DBusError *error)
{
ElementType t;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
/* printf ("START: %s\n", element_name); */
t = top_element_type (parser);
if (t == ELEMENT_NONE)
{
if (strcmp (element_name, "busconfig") == 0)
{
if (!check_no_attributes (parser, "busconfig", attribute_names, attribute_values, error))
return FALSE;
if (push_element (parser, ELEMENT_BUSCONFIG) == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
return TRUE;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Unknown element <%s> at root of configuration file",
element_name);
return FALSE;
}
}
else if (t == ELEMENT_BUSCONFIG)
{
return start_busconfig_child (parser, element_name,
attribute_names, attribute_values,
error);
}
else if (t == ELEMENT_POLICY)
{
return start_policy_child (parser, element_name,
attribute_names, attribute_values,
error);
}
else if (t == ELEMENT_SELINUX)
{
return start_selinux_child (parser, element_name,
attribute_names, attribute_values,
error);
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> is not allowed in this context",
element_name);
return FALSE;
}
}
static dbus_bool_t
set_limit (BusConfigParser *parser,
const char *name,
long value,
DBusError *error)
{
dbus_bool_t must_be_positive;
dbus_bool_t must_be_int;
must_be_int = FALSE;
must_be_positive = FALSE;
if (strcmp (name, "max_incoming_bytes") == 0)
{
must_be_positive = TRUE;
parser->limits.max_incoming_bytes = value;
}
else if (strcmp (name, "max_incoming_unix_fds") == 0)
{
must_be_positive = TRUE;
parser->limits.max_incoming_unix_fds = value;
}
else if (strcmp (name, "max_outgoing_bytes") == 0)
{
must_be_positive = TRUE;
parser->limits.max_outgoing_bytes = value;
}
else if (strcmp (name, "max_outgoing_unix_fds") == 0)
{
must_be_positive = TRUE;
parser->limits.max_outgoing_unix_fds = value;
}
else if (strcmp (name, "max_message_size") == 0)
{
must_be_positive = TRUE;
parser->limits.max_message_size = value;
}
else if (strcmp (name, "max_message_unix_fds") == 0)
{
must_be_positive = TRUE;
parser->limits.max_message_unix_fds = value;
}
else if (strcmp (name, "service_start_timeout") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.activation_timeout = value;
}
else if (strcmp (name, "auth_timeout") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.auth_timeout = value;
}
else if (strcmp (name, "reply_timeout") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.reply_timeout = value;
}
else if (strcmp (name, "max_completed_connections") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_completed_connections = value;
}
else if (strcmp (name, "max_incomplete_connections") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_incomplete_connections = value;
}
else if (strcmp (name, "max_connections_per_user") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_connections_per_user = value;
}
else if (strcmp (name, "max_pending_service_starts") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_pending_activations = value;
}
else if (strcmp (name, "max_names_per_connection") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_services_per_connection = value;
}
else if (strcmp (name, "max_match_rules_per_connection") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_match_rules_per_connection = value;
}
else if (strcmp (name, "max_replies_per_connection") == 0)
{
must_be_positive = TRUE;
must_be_int = TRUE;
parser->limits.max_replies_per_connection = value;
}
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"There is no limit called \"%s\"\n",
name);
return FALSE;
}
if (must_be_positive && value < 0)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<limit name=\"%s\"> must be a positive number\n",
name);
return FALSE;
}
if (must_be_int &&
(value < _DBUS_INT_MIN || value > _DBUS_INT_MAX))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<limit name=\"%s\"> value is too large\n",
name);
return FALSE;
}
return TRUE;
}
dbus_bool_t
bus_config_parser_end_element (BusConfigParser *parser,
const char *element_name,
DBusError *error)
{
ElementType t;
const char *n;
Element *e;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
/* printf ("END: %s\n", element_name); */
t = top_element_type (parser);
if (t == ELEMENT_NONE)
{
/* should probably be an assertion failure but
* being paranoid about XML parsers
*/
dbus_set_error (error, DBUS_ERROR_FAILED,
"XML parser ended element with no element on the stack");
return FALSE;
}
n = bus_config_parser_element_type_to_name (t);
_dbus_assert (n != NULL);
if (strcmp (n, element_name) != 0)
{
/* should probably be an assertion failure but
* being paranoid about XML parsers
*/
dbus_set_error (error, DBUS_ERROR_FAILED,
"XML element <%s> ended but topmost element on the stack was <%s>",
element_name, n);
return FALSE;
}
e = peek_element (parser);
_dbus_assert (e != NULL);
switch (e->type)
{
case ELEMENT_NONE:
_dbus_assert_not_reached ("element in stack has no type");
break;
case ELEMENT_INCLUDE:
case ELEMENT_USER:
case ELEMENT_CONFIGTYPE:
case ELEMENT_LISTEN:
case ELEMENT_PIDFILE:
case ELEMENT_AUTH:
case ELEMENT_SERVICEDIR:
case ELEMENT_SERVICEHELPER:
case ELEMENT_INCLUDEDIR:
case ELEMENT_LIMIT:
if (!e->had_content)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"XML element <%s> was expected to have content inside it",
bus_config_parser_element_type_to_name (e->type));
return FALSE;
}
if (e->type == ELEMENT_LIMIT)
{
if (!set_limit (parser, e->d.limit.name, e->d.limit.value,
error))
return FALSE;
}
break;
case ELEMENT_BUSCONFIG:
case ELEMENT_POLICY:
case ELEMENT_ALLOW:
case ELEMENT_DENY:
case ELEMENT_FORK:
case ELEMENT_SYSLOG:
case ELEMENT_KEEP_UMASK:
case ELEMENT_SELINUX:
case ELEMENT_ASSOCIATE:
case ELEMENT_STANDARD_SESSION_SERVICEDIRS:
case ELEMENT_STANDARD_SYSTEM_SERVICEDIRS:
case ELEMENT_ALLOW_ANONYMOUS:
break;
}
pop_element (parser);
return TRUE;
}
static dbus_bool_t
all_whitespace (const DBusString *str)
{
int i;
_dbus_string_skip_white (str, 0, &i);
return i == _dbus_string_get_length (str);
}
static dbus_bool_t
make_full_path (const DBusString *basedir,
const DBusString *filename,
DBusString *full_path)
{
if (_dbus_path_is_absolute (filename))
{
return _dbus_string_copy (filename, 0, full_path, 0);
}
else
{
if (!_dbus_string_copy (basedir, 0, full_path, 0))
return FALSE;
if (!_dbus_concat_dir_and_file (full_path, filename))
return FALSE;
return TRUE;
}
}
static dbus_bool_t
include_file (BusConfigParser *parser,
const DBusString *filename,
dbus_bool_t ignore_missing,
DBusError *error)
{
/* FIXME good test case for this would load each config file in the
* test suite both alone, and as an include, and check
* that the result is the same
*/
BusConfigParser *included;
const char *filename_str;
DBusError tmp_error;
dbus_error_init (&tmp_error);
filename_str = _dbus_string_get_const_data (filename);
/* Check to make sure this file hasn't already been included. */
if (seen_include (parser, filename))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Circular inclusion of file '%s'",
filename_str);
return FALSE;
}
if (! _dbus_list_append (&parser->included_files, (void *) filename_str))
{
BUS_SET_OOM (error);
return FALSE;
}
/* Since parser is passed in as the parent, included
inherits parser's limits. */
included = bus_config_load (filename, FALSE, parser, &tmp_error);
_dbus_list_pop_last (&parser->included_files);
if (included == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
if (dbus_error_has_name (&tmp_error, DBUS_ERROR_FILE_NOT_FOUND) &&
ignore_missing)
{
dbus_error_free (&tmp_error);
return TRUE;
}
else
{
dbus_move_error (&tmp_error, error);
return FALSE;
}
}
else
{
_DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
if (!merge_included (parser, included, error))
{
bus_config_parser_unref (included);
return FALSE;
}
/* Copy included's limits back to parser. */
parser->limits = included->limits;
bus_config_parser_unref (included);
return TRUE;
}
}
static dbus_bool_t
servicehelper_path (BusConfigParser *parser,
const DBusString *filename,
DBusError *error)
{
const char *filename_str;
char *servicehelper;
filename_str = _dbus_string_get_const_data (filename);
/* copy to avoid overwriting with NULL on OOM */
servicehelper = _dbus_strdup (filename_str);
/* check for OOM */
if (servicehelper == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
/* save the latest servicehelper only if not OOM */
dbus_free (parser->servicehelper);
parser->servicehelper = servicehelper;
/* We don't check whether the helper exists; instead we
* would just fail to ever activate anything if it doesn't.
* This allows an admin to fix the problem if it doesn't exist.
* It also allows the parser test suite to successfully parse
* test cases without installing the helper. ;-)
*/
return TRUE;
}
static dbus_bool_t
include_dir (BusConfigParser *parser,
const DBusString *dirname,
DBusError *error)
{
DBusString filename;
dbus_bool_t retval;
DBusError tmp_error;
DBusDirIter *dir;
char *s;
if (!_dbus_string_init (&filename))
{
BUS_SET_OOM (error);
return FALSE;
}
retval = FALSE;
dir = _dbus_directory_open (dirname, error);
if (dir == NULL)
goto failed;
dbus_error_init (&tmp_error);
while (_dbus_directory_get_next_file (dir, &filename, &tmp_error))
{
DBusString full_path;
if (!_dbus_string_init (&full_path))
{
BUS_SET_OOM (error);
goto failed;
}
if (!_dbus_string_copy (dirname, 0, &full_path, 0))
{
BUS_SET_OOM (error);
_dbus_string_free (&full_path);
goto failed;
}
if (!_dbus_concat_dir_and_file (&full_path, &filename))
{
BUS_SET_OOM (error);
_dbus_string_free (&full_path);
goto failed;
}
if (_dbus_string_ends_with_c_str (&full_path, ".conf"))
{
if (!include_file (parser, &full_path, TRUE, error))
{
if (dbus_error_is_set (error))
{
/* We log to syslog unconditionally here, because this is
* the configuration parser, so we don't yet know whether
* this bus is going to want to write to syslog! (There's
* also some layer inversion going on, if we want to use
* the bus context.) */
_dbus_system_log (DBUS_SYSTEM_LOG_INFO,
"Encountered error '%s' while parsing '%s'\n",
error->message,
_dbus_string_get_const_data (&full_path));
dbus_error_free (error);
}
}
}
_dbus_string_free (&full_path);
}
if (dbus_error_is_set (&tmp_error))
{
dbus_move_error (&tmp_error, error);
goto failed;
}
if (!_dbus_string_copy_data (dirname, &s))
{
BUS_SET_OOM (error);
goto failed;
}
if (!_dbus_list_append (&parser->conf_dirs, s))
{
dbus_free (s);
BUS_SET_OOM (error);
goto failed;
}
retval = TRUE;
failed:
_dbus_string_free (&filename);
if (dir)
_dbus_directory_close (dir);
return retval;
}
dbus_bool_t
bus_config_parser_content (BusConfigParser *parser,
const DBusString *content,
DBusError *error)
{
Element *e;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
#if 0
{
const char *c_str;
_dbus_string_get_const_data (content, &c_str);
printf ("CONTENT %d bytes: %s\n", _dbus_string_get_length (content), c_str);
}
#endif
e = peek_element (parser);
if (e == NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Text content outside of any XML element in configuration file");
return FALSE;
}
else if (e->had_content)
{
_dbus_assert_not_reached ("Element had multiple content blocks");
return FALSE;
}
switch (top_element_type (parser))
{
case ELEMENT_NONE:
_dbus_assert_not_reached ("element at top of stack has no type");
return FALSE;
case ELEMENT_BUSCONFIG:
case ELEMENT_POLICY:
case ELEMENT_ALLOW:
case ELEMENT_DENY:
case ELEMENT_FORK:
case ELEMENT_SYSLOG:
case ELEMENT_KEEP_UMASK:
case ELEMENT_STANDARD_SESSION_SERVICEDIRS:
case ELEMENT_STANDARD_SYSTEM_SERVICEDIRS:
case ELEMENT_ALLOW_ANONYMOUS:
case ELEMENT_SELINUX:
case ELEMENT_ASSOCIATE:
if (all_whitespace (content))
return TRUE;
else
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"No text content expected inside XML element %s in configuration file",
bus_config_parser_element_type_to_name (top_element_type (parser)));
return FALSE;
}
case ELEMENT_PIDFILE:
{
char *s;
e->had_content = TRUE;
if (!_dbus_string_copy_data (content, &s))
goto nomem;
dbus_free (parser->pidfile);
parser->pidfile = s;
}
break;
case ELEMENT_INCLUDE:
{
DBusString full_path, selinux_policy_root;
e->had_content = TRUE;
if (e->d.include.if_selinux_enabled
&& !bus_selinux_enabled ())
break;
if (!_dbus_string_init (&full_path))
goto nomem;
if (e->d.include.selinux_root_relative)
{
if (!bus_selinux_get_policy_root ())
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Could not determine SELinux policy root for relative inclusion");
_dbus_string_free (&full_path);
return FALSE;
}
_dbus_string_init_const (&selinux_policy_root,
bus_selinux_get_policy_root ());
if (!make_full_path (&selinux_policy_root, content, &full_path))
{
_dbus_string_free (&full_path);
goto nomem;
}
}
else if (!make_full_path (&parser->basedir, content, &full_path))
{
_dbus_string_free (&full_path);
goto nomem;
}
if (!include_file (parser, &full_path,
e->d.include.ignore_missing, error))
{
_dbus_string_free (&full_path);
return FALSE;
}
_dbus_string_free (&full_path);
}
break;
case ELEMENT_SERVICEHELPER:
{
DBusString full_path;
e->had_content = TRUE;
if (!_dbus_string_init (&full_path))
goto nomem;
if (!make_full_path (&parser->basedir, content, &full_path))
{
_dbus_string_free (&full_path);
goto nomem;
}
if (!servicehelper_path (parser, &full_path, error))
{
_dbus_string_free (&full_path);
return FALSE;
}
_dbus_string_free (&full_path);
}
break;
case ELEMENT_INCLUDEDIR:
{
DBusString full_path;
e->had_content = TRUE;
if (!_dbus_string_init (&full_path))
goto nomem;
if (!make_full_path (&parser->basedir, content, &full_path))
{
_dbus_string_free (&full_path);
goto nomem;
}
if (!include_dir (parser, &full_path, error))
{
_dbus_string_free (&full_path);
return FALSE;
}
_dbus_string_free (&full_path);
}
break;
case ELEMENT_USER:
{
char *s;
e->had_content = TRUE;
if (!_dbus_string_copy_data (content, &s))
goto nomem;
dbus_free (parser->user);
parser->user = s;
}
break;
case ELEMENT_CONFIGTYPE:
{
char *s;
e->had_content = TRUE;
if (!_dbus_string_copy_data (content, &s))
goto nomem;
dbus_free (parser->bus_type);
parser->bus_type = s;
}
break;
case ELEMENT_LISTEN:
{
char *s;
e->had_content = TRUE;
if (!_dbus_string_copy_data (content, &s))
goto nomem;
if (!_dbus_list_append (&parser->listen_on,
s))
{
dbus_free (s);
goto nomem;
}
}
break;
case ELEMENT_AUTH:
{
char *s;
e->had_content = TRUE;
if (!_dbus_string_copy_data (content, &s))
goto nomem;
if (!_dbus_list_append (&parser->mechanisms,
s))
{
dbus_free (s);
goto nomem;
}
}
break;
case ELEMENT_SERVICEDIR:
{
char *s;
DBusString full_path;
e->had_content = TRUE;
if (!_dbus_string_init (&full_path))
goto nomem;
if (!make_full_path (&parser->basedir, content, &full_path))
{
_dbus_string_free (&full_path);
goto nomem;
}
if (!_dbus_string_copy_data (&full_path, &s))
{
_dbus_string_free (&full_path);
goto nomem;
}
/* _only_ extra session directories can be specified */
if (!service_dirs_append_unique_or_free (&parser->service_dirs, s))
{
_dbus_string_free (&full_path);
dbus_free (s);
goto nomem;
}
_dbus_string_free (&full_path);
}
break;
case ELEMENT_LIMIT:
{
long val;
e->had_content = TRUE;
val = 0;
if (!_dbus_string_parse_int (content, 0, &val, NULL))
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"<limit name=\"%s\"> element has invalid value (could not parse as integer)",
e->d.limit.name);
return FALSE;
}
e->d.limit.value = val;
_dbus_verbose ("Loaded value %ld for limit %s\n",
e->d.limit.value,
e->d.limit.name);
}
break;
}
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
return TRUE;
nomem:
BUS_SET_OOM (error);
return FALSE;
}
dbus_bool_t
bus_config_parser_finished (BusConfigParser *parser,
DBusError *error)
{
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
if (parser->stack != NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Element <%s> was not closed in configuration file",
bus_config_parser_element_type_to_name (top_element_type (parser)));
return FALSE;
}
if (parser->is_toplevel && parser->listen_on == NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Configuration file needs one or more <listen> elements giving addresses");
return FALSE;
}
return TRUE;
}
const char*
bus_config_parser_get_user (BusConfigParser *parser)
{
return parser->user;
}
const char*
bus_config_parser_get_type (BusConfigParser *parser)
{
return parser->bus_type;
}
DBusList**
bus_config_parser_get_addresses (BusConfigParser *parser)
{
return &parser->listen_on;
}
DBusList**
bus_config_parser_get_mechanisms (BusConfigParser *parser)
{
return &parser->mechanisms;
}
DBusList**
bus_config_parser_get_service_dirs (BusConfigParser *parser)
{
return &parser->service_dirs;
}
DBusList**
bus_config_parser_get_conf_dirs (BusConfigParser *parser)
{
return &parser->conf_dirs;
}
dbus_bool_t
bus_config_parser_get_fork (BusConfigParser *parser)
{
return parser->fork;
}
dbus_bool_t
bus_config_parser_get_syslog (BusConfigParser *parser)
{
return parser->syslog;
}
dbus_bool_t
bus_config_parser_get_keep_umask (BusConfigParser *parser)
{
return parser->keep_umask;
}
dbus_bool_t
bus_config_parser_get_allow_anonymous (BusConfigParser *parser)
{
return parser->allow_anonymous;
}
const char *
bus_config_parser_get_pidfile (BusConfigParser *parser)
{
return parser->pidfile;
}
const char *
bus_config_parser_get_servicehelper (BusConfigParser *parser)
{
return parser->servicehelper;
}
BusPolicy*
bus_config_parser_steal_policy (BusConfigParser *parser)
{
BusPolicy *policy;
_dbus_assert (parser->policy != NULL); /* can only steal the policy 1 time */
policy = parser->policy;
parser->policy = NULL;
return policy;
}
/* Overwrite any limits that were set in the configuration file */
void
bus_config_parser_get_limits (BusConfigParser *parser,
BusLimits *limits)
{
*limits = parser->limits;
}
DBusHashTable*
bus_config_parser_steal_service_context_table (BusConfigParser *parser)
{
DBusHashTable *table;
_dbus_assert (parser->service_context_table != NULL); /* can only steal once */
table = parser->service_context_table;
parser->service_context_table = NULL;
return table;
}
#ifdef DBUS_BUILD_TESTS
#include <stdio.h>
typedef enum
{
VALID,
INVALID,
UNKNOWN
} Validity;
static dbus_bool_t
do_check_own_rules (BusPolicy *policy)
{
const struct {
char *name;
dbus_bool_t allowed;
} checks[] = {
{"org.freedesktop", FALSE},
{"org.freedesktop.ManySystem", FALSE},
{"org.freedesktop.ManySystems", TRUE},
{"org.freedesktop.ManySystems.foo", TRUE},
{"org.freedesktop.ManySystems.foo.bar", TRUE},
{"org.freedesktop.ManySystems2", FALSE},
{"org.freedesktop.ManySystems2.foo", FALSE},
{"org.freedesktop.ManySystems2.foo.bar", FALSE},
{NULL, FALSE}
};
int i = 0;
while (checks[i].name)
{
DBusString service_name;
dbus_bool_t ret;
if (!_dbus_string_init (&service_name))
_dbus_assert_not_reached ("couldn't init string");
if (!_dbus_string_append (&service_name, checks[i].name))
_dbus_assert_not_reached ("couldn't append string");
ret = bus_policy_check_can_own (policy, &service_name);
printf (" Check name %s: %s\n", checks[i].name,
ret ? "allowed" : "not allowed");
if (checks[i].allowed && !ret)
{
_dbus_warn ("Cannot own %s\n", checks[i].name);
return FALSE;
}
if (!checks[i].allowed && ret)
{
_dbus_warn ("Can own %s\n", checks[i].name);
return FALSE;
}
_dbus_string_free (&service_name);
i++;
}
return TRUE;
}
static dbus_bool_t
do_load (const DBusString *full_path,
Validity validity,
dbus_bool_t oom_possible,
dbus_bool_t check_own_rules)
{
BusConfigParser *parser;
DBusError error;
dbus_error_init (&error);
parser = bus_config_load (full_path, TRUE, NULL, &error);
if (parser == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (&error);
if (oom_possible &&
dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
{
_dbus_verbose ("Failed to load valid file due to OOM\n");
dbus_error_free (&error);
return TRUE;
}
else if (validity == VALID)
{
_dbus_warn ("Failed to load valid file but still had memory: %s\n",
error.message);
dbus_error_free (&error);
return FALSE;
}
else
{
dbus_error_free (&error);
return TRUE;
}
}
else
{
_DBUS_ASSERT_ERROR_IS_CLEAR (&error);
if (check_own_rules && do_check_own_rules (parser->policy) == FALSE)
{
return FALSE;
}
bus_config_parser_unref (parser);
if (validity == INVALID)
{
_dbus_warn ("Accepted invalid file\n");
return FALSE;
}
return TRUE;
}
}
typedef struct
{
const DBusString *full_path;
Validity validity;
dbus_bool_t check_own_rules;
} LoaderOomData;
static dbus_bool_t
check_loader_oom_func (void *data)
{
LoaderOomData *d = data;
return do_load (d->full_path, d->validity, TRUE, d->check_own_rules);
}
static dbus_bool_t
process_test_valid_subdir (const DBusString *test_base_dir,
const char *subdir,
Validity validity)
{
DBusString test_directory;
DBusString filename;
DBusDirIter *dir;
dbus_bool_t retval;
DBusError error;
retval = FALSE;
dir = NULL;
if (!_dbus_string_init (&test_directory))
_dbus_assert_not_reached ("didn't allocate test_directory\n");