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modules.c
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modules.c
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/*
* modules.c Radius module support.
*
* Version: $Id$
*
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2003,2006 The FreeRADIUS server project
* Copyright 2000 Alan DeKok <aland@ox.org>
* Copyright 2000 Alan Curry <pacman@world.std.com>
*/
RCSID("$Id$")
#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modpriv.h>
#include <freeradius-devel/modcall.h>
#include <freeradius-devel/parser.h>
#include <freeradius-devel/rad_assert.h>
extern bool check_config;
typedef struct indexed_modcallable {
rlm_components_t comp;
int idx;
modcallable *modulelist;
} indexed_modcallable;
typedef struct virtual_server_t {
char const *name;
time_t created;
int can_free;
CONF_SECTION *cs;
rbtree_t *components;
modcallable *mc[RLM_COMPONENT_COUNT];
CONF_SECTION *subcs[RLM_COMPONENT_COUNT];
struct virtual_server_t *next;
} virtual_server_t;
/*
* Keep a hash of virtual servers, so that we can reload them.
*/
#define VIRTUAL_SERVER_HASH_SIZE (256)
static virtual_server_t *virtual_servers[VIRTUAL_SERVER_HASH_SIZE];
static rbtree_t *module_tree = NULL;
static rbtree_t *instance_tree = NULL;
struct fr_module_hup_t {
module_instance_t *mi;
time_t when;
void *insthandle;
fr_module_hup_t *next;
};
/*
* Ordered by component
*/
const section_type_value_t section_type_value[RLM_COMPONENT_COUNT] = {
{ "authenticate", "Auth-Type", PW_AUTH_TYPE },
{ "authorize", "Autz-Type", PW_AUTZ_TYPE },
{ "preacct", "Pre-Acct-Type", PW_PRE_ACCT_TYPE },
{ "accounting", "Acct-Type", PW_ACCT_TYPE },
{ "session", "Session-Type", PW_SESSION_TYPE },
{ "pre-proxy", "Pre-Proxy-Type", PW_PRE_PROXY_TYPE },
{ "post-proxy", "Post-Proxy-Type", PW_POST_PROXY_TYPE },
{ "post-auth", "Post-Auth-Type", PW_POST_AUTH_TYPE }
#ifdef WITH_COA
,
{ "recv-coa", "Recv-CoA-Type", PW_RECV_COA_TYPE },
{ "send-coa", "Send-CoA-Type", PW_SEND_COA_TYPE }
#endif
};
#ifndef RTLD_NOW
#define RTLD_NOW (0)
#endif
#ifndef RTLD_LOCAL
#define RTLD_LOCAL (0)
#endif
#ifdef __APPLE__
#define LT_SHREXT ".dylib"
#define LD_LIBRARY_PATH "DYLD_FALLBACK_LIBRARY_PATH"
#elif defined (WIN32)
#define LT_SHREXT ".dll"
#else
#define LT_SHREXT ".so"
#define LD_LIBRARY_PATH "LD_LIBRARY_PATH"
#endif
/** Check if the magic number in the module matches the one in the library
*
* This is used to detect potential ABI issues caused by running with modules which
* were built for a different version of the server.
*
* @param cs being parsed.
* @param module being loaded.
* @returns 0 on success, -1 if prefix mismatch, -2 if version mismatch, -3 if commit mismatch.
*/
static int check_module_magic(CONF_SECTION *cs, module_t const *module)
{
if (MAGIC_PREFIX(module->magic) != MAGIC_PREFIX(RADIUSD_MAGIC_NUMBER)) {
cf_log_err_cs(cs, "Application and rlm_%s magic number (prefix) mismatch."
" application: %x module: %x", module->name,
MAGIC_PREFIX(RADIUSD_MAGIC_NUMBER),
MAGIC_PREFIX(module->magic));
return -1;
}
if (MAGIC_VERSION(module->magic) != MAGIC_VERSION(RADIUSD_MAGIC_NUMBER)) {
cf_log_err_cs(cs, "Application and rlm_%s magic number (version) mismatch."
" application: %lx module: %lx", module->name,
(unsigned long) MAGIC_VERSION(RADIUSD_MAGIC_NUMBER),
(unsigned long) MAGIC_VERSION(module->magic));
return -2;
}
if (MAGIC_COMMIT(module->magic) != MAGIC_COMMIT(RADIUSD_MAGIC_NUMBER)) {
cf_log_err_cs(cs, "Application and rlm_%s magic number (commit) mismatch."
" application: %lx module: %lx", module->name,
(unsigned long) MAGIC_COMMIT(RADIUSD_MAGIC_NUMBER),
(unsigned long) MAGIC_COMMIT(module->magic));
return -3;
}
return 0;
}
/*
* Because dlopen produces really shitty and inaccurate error messages
*/
static void check_lib_access(char const *name)
{
if (access(name, R_OK) < 0) switch (errno) {
case EACCES:
WDEBUG("Library \"%s\" exists, but we don't have permission to read", name);
break;
case ENOENT:
DEBUG4("Library not found at path \"%s\"", name);
break;
default:
DEBUG4("Possible issue accessing Library \"%s\": %s", name, fr_syserror(errno));
break;
}
}
lt_dlhandle lt_dlopenext(char const *name)
{
int flags = RTLD_NOW;
void *handle;
char buffer[2048];
char *env;
#ifdef RTLD_GLOBAL
if (strcmp(name, "rlm_perl") == 0) {
flags |= RTLD_GLOBAL;
} else
#endif
flags |= RTLD_LOCAL;
#ifndef NDEBUG
/*
* Bind all the symbols *NOW* so we don't hit errors later
*/
flags |= RTLD_NOW;
#endif
/*
* Prefer loading our libraries by absolute path.
*/
snprintf(buffer, sizeof(buffer), "%s/%s%s", radlib_dir, name, LT_SHREXT);
DEBUG4("Loading library using absolute path");
handle = dlopen(buffer, flags);
if (handle) {
return handle;
}
check_lib_access(buffer);
DEBUG4("Falling back to linker search path(s)");
if (DEBUG_ENABLED4) {
#ifdef __APPLE__
env = getenv("LD_LIBRARY_PATH");
if (env) {
DEBUG4("LD_LIBRARY_PATH : %s", env);
}
env = getenv("DYLD_LIBRARY_PATH");
if (env) {
DEBUG4("DYLB_LIBRARY_PATH : %s", env);
}
env = getenv("DYLD_FALLBACK_LIBRARY_PATH");
if (env) {
DEBUG4("DYLD_FALLBACK_LIBRARY_PATH : %s", env);
}
env = getcwd(buffer, sizeof(buffer));
if (env) {
DEBUG4("Current directory : %s", env);
}
#else
env = getenv("LD_LIBRARY_PATH");
if (env) {
DEBUG4("LD_LIBRARY_PATH : %s", env);
}
DEBUG4("Defaults : /lib:/usr/lib");
#endif
}
strlcpy(buffer, name, sizeof(buffer));
/*
* FIXME: Make this configurable...
*/
strlcat(buffer, LT_SHREXT, sizeof(buffer));
return dlopen(buffer, flags);
}
void *lt_dlsym(lt_dlhandle handle, UNUSED char const *symbol)
{
return dlsym(handle, symbol);
}
int lt_dlclose(lt_dlhandle handle)
{
if (!handle) return 0;
return dlclose(handle);
}
char const *lt_dlerror(void)
{
return dlerror();
}
static int virtual_server_idx(char const *name)
{
uint32_t hash;
if (!name) return 0;
hash = fr_hash_string(name);
return hash & (VIRTUAL_SERVER_HASH_SIZE - 1);
}
static virtual_server_t *virtual_server_find(char const *name)
{
rlm_rcode_t rcode;
virtual_server_t *server;
rcode = virtual_server_idx(name);
for (server = virtual_servers[rcode];
server != NULL;
server = server->next) {
if (!name && !server->name) break;
if ((name && server->name) &&
(strcmp(name, server->name) == 0)) break;
}
return server;
}
static int _virtual_server_free(virtual_server_t *server)
{
server = talloc_get_type_abort(server, virtual_server_t);
if (server->components) rbtree_free(server->components);
return 0;
}
void virtual_servers_free(time_t when)
{
int i;
virtual_server_t **last;
for (i = 0; i < VIRTUAL_SERVER_HASH_SIZE; i++) {
virtual_server_t *server, *next;
last = &virtual_servers[i];
for (server = virtual_servers[i];
server != NULL;
server = next) {
next = server->next;
/*
* If we delete it, fix the links so that
* we don't orphan anything. Also,
* delete it if it's old, AND a newer one
* was defined.
*
* Otherwise, the last pointer gets set to
* the one we didn't delete.
*/
if ((when == 0) ||
((server->created < when) && server->can_free)) {
*last = server->next;
talloc_free(server);
} else {
last = &(server->next);
}
}
}
}
static int indexed_modcallable_cmp(void const *one, void const *two)
{
indexed_modcallable const *a = one;
indexed_modcallable const *b = two;
if (a->comp < b->comp) return -1;
if (a->comp > b->comp) return +1;
return a->idx - b->idx;
}
/*
* Compare two module entries
*/
static int module_instance_cmp(void const *one, void const *two)
{
module_instance_t const *a = one;
module_instance_t const *b = two;
return strcmp(a->name, b->name);
}
static void module_instance_free_old(UNUSED CONF_SECTION *cs, module_instance_t *node,
time_t when)
{
fr_module_hup_t *mh, **last;
/*
* Walk the list, freeing up old instances.
*/
last = &(node->mh);
while (*last) {
mh = *last;
/*
* Free only every 60 seconds.
*/
if ((when - mh->when) < 60) {
last = &(mh->next);
continue;
}
talloc_free(mh->insthandle);
*last = mh->next;
talloc_free(mh);
}
}
/*
* Free a module instance.
*/
static void module_instance_free(void *data)
{
module_instance_t *this = data;
module_instance_free_old(this->cs, this, time(NULL) + 100);
#ifdef HAVE_PTHREAD_H
if (this->mutex) {
/*
* FIXME
* The mutex MIGHT be locked...
* we'll check for that later, I guess.
*/
pthread_mutex_destroy(this->mutex);
talloc_free(this->mutex);
}
#endif
/*
* Remove any registered paircompares.
*/
paircompare_unregister_instance(this->insthandle);
xlat_unregister(this->name, NULL, this->insthandle);
#ifndef NDEBUG
memset(this, 0, sizeof(*this));
#endif
talloc_free(this);
}
/*
* Compare two module entries
*/
static int module_entry_cmp(void const *one, void const *two)
{
module_entry_t const *a = one;
module_entry_t const *b = two;
return strcmp(a->name, b->name);
}
/*
* Free a module entry.
*/
static int _module_entry_free(module_entry_t *this)
{
this = talloc_get_type_abort(this, module_entry_t);
#ifndef NDEBUG
/*
* Don't dlclose() modules if we're doing memory
* debugging. This removes the symbols needed by
* valgrind.
*/
if (!mainconfig.debug_memory)
#endif
dlclose(this->handle); /* ignore any errors */
return 0;
}
/*
* Remove the module lists.
*/
int modules_free(void)
{
rbtree_free(instance_tree);
rbtree_free(module_tree);
return 0;
}
/*
* Find a module on disk or in memory, and link to it.
*/
static module_entry_t *linkto_module(char const *module_name,
CONF_SECTION *cs)
{
module_entry_t myentry;
module_entry_t *node;
void *handle = NULL;
module_t const *module;
strlcpy(myentry.name, module_name, sizeof(myentry.name));
node = rbtree_finddata(module_tree, &myentry);
if (node) return node;
/*
* Link to the module's rlm_FOO{} structure, the same as
* the module name.
*/
#if !defined(WITH_LIBLTDL) && defined(HAVE_DLFCN_H) && defined(RTLD_SELF)
module = dlsym(RTLD_SELF, module_name);
if (module) goto open_self;
#endif
/*
* Keep the handle around so we can dlclose() it.
*/
handle = lt_dlopenext(module_name);
if (!handle) {
cf_log_err_cs(cs,
"Failed to link to module '%s': %s\n",
module_name, dlerror());
return NULL;
}
DEBUG3(" (Loaded %s, checking if it's valid)", module_name);
/*
* libltld MAY core here, if the handle it gives us contains
* garbage data.
*/
module = dlsym(handle, module_name);
if (!module) {
cf_log_err_cs(cs,
"Failed linking to %s structure: %s\n",
module_name, dlerror());
dlclose(handle);
return NULL;
}
#if !defined(WITH_LIBLTDL) && defined (HAVE_DLFCN_H) && defined(RTLD_SELF)
open_self:
#endif
/*
* Before doing anything else, check if it's sane.
*/
if (check_module_magic(cs, module) < 0) {
dlclose(handle);
return NULL;
}
/* make room for the module type */
node = talloc_zero(cs, module_entry_t);
talloc_set_destructor(node, _module_entry_free);
strlcpy(node->name, module_name, sizeof(node->name));
node->module = module;
node->handle = handle;
cf_log_module(cs, "Loaded module %s", module_name);
/*
* Add the module as "rlm_foo-version" to the configuration
* section.
*/
if (!rbtree_insert(module_tree, node)) {
ERROR("Failed to cache module %s", module_name);
dlclose(handle);
talloc_free(node);
return NULL;
}
return node;
}
/** Parse module's configuration section and setup destructors
*
*/
static int module_conf_parse(module_instance_t *node, void **handle)
{
*handle = NULL;
/*
* If there is supposed to be instance data, allocate it now.
* Also parse the configuration data, if required.
*/
if (node->entry->module->inst_size) {
/* FIXME: make this rlm_config_t ?? */
*handle = talloc_zero_array(node, uint8_t, node->entry->module->inst_size);
rad_assert(handle);
/*
* So we can see where this configuration is from
* FIXME: set it to rlm_NAME_t, or some such thing
*/
talloc_set_name(*handle, "rlm_config_t");
if (node->entry->module->config &&
(cf_section_parse(node->cs, *handle, node->entry->module->config) < 0)) {
cf_log_err_cs(node->cs,"Invalid configuration for module \"%s\"", node->name);
talloc_free(*handle);
return -1;
}
/*
* Set the destructor.
*/
if (node->entry->module->detach) {
talloc_set_destructor((void *) *handle, node->entry->module->detach);
}
}
return 0;
}
/*
* Find a module instance.
*/
module_instance_t *find_module_instance(CONF_SECTION *modules,
char const *askedname, int do_link)
{
bool check_config_safe = false;
CONF_SECTION *cs;
char const *name1, *instname;
module_instance_t *node, myNode;
char module_name[256];
if (!modules) return NULL;
/*
* Look for the real name. Ignore the first character,
* which tells the server "it's OK for this module to not
* exist."
*/
instname = askedname;
if (instname[0] == '-') {
instname++;
}
/*
* Module instances are declared in the modules{} block
* and referenced later by their name, which is the
* name2 from the config section, or name1 if there was
* no name2.
*/
cs = cf_section_sub_find_name2(modules, NULL, instname);
if (!cs) {
ERROR("Cannot find a configuration entry for module \"%s\"", instname);
return NULL;
}
/*
* If there's already a module instance, return it.
*/
strlcpy(myNode.name, instname, sizeof(myNode.name));
node = rbtree_finddata(instance_tree, &myNode);
if (node) {
return node;
}
if (!do_link) {
return NULL;
}
name1 = cf_section_name1(cs);
/*
* Found the configuration entry, hang the node struct off of the
* configuration section. If the CS is free'd the instance will
* be too.
*/
node = talloc_zero(cs, module_instance_t);
node->cs = cs;
/*
* Names in the "modules" section aren't prefixed
* with "rlm_", so we add it here.
*/
snprintf(module_name, sizeof(module_name), "rlm_%s", name1);
/*
* Pull in the module object
*/
node->entry = linkto_module(module_name, cs);
if (!node->entry) {
talloc_free(node);
/* linkto_module logs any errors */
return NULL;
}
if (check_config && (node->entry->module->instantiate) &&
(node->entry->module->type & RLM_TYPE_CHECK_CONFIG_UNSAFE) != 0) {
char const *value = NULL;
CONF_PAIR *cp;
cp = cf_pair_find(cs, "force_check_config");
if (cp) {
value = cf_pair_value(cp);
}
if (value && (strcmp(value, "yes") == 0)) goto print_inst;
cf_log_module(cs, "Skipping instantiation of %s", instname);
} else {
print_inst:
check_config_safe = true;
cf_log_module(cs, "Instantiating module \"%s\" from file %s", instname,
cf_section_filename(cs));
}
strlcpy(node->name, instname, sizeof(node->name));
/*
* Parse the module configuration, and setup destructors so the
* module's detach method is called when it's instance data is
* about to be freed.
*/
if (module_conf_parse(node, &node->insthandle) < 0) {
talloc_free(node);
return NULL;
}
/*
* Call the module's instantiation routine.
*/
if ((node->entry->module->instantiate) &&
(!check_config || check_config_safe) &&
((node->entry->module->instantiate)(cs, node->insthandle) < 0)) {
cf_log_err_cs(cs, "Instantiation failed for module \"%s\"", node->name);
talloc_free(node);
return NULL;
}
#ifdef HAVE_PTHREAD_H
/*
* If we're threaded, check if the module is thread-safe.
*
* If it isn't, we create a mutex.
*/
if ((node->entry->module->type & RLM_TYPE_THREAD_UNSAFE) != 0) {
node->mutex = talloc_zero(node, pthread_mutex_t);
/*
* Initialize the mutex.
*/
pthread_mutex_init(node->mutex, NULL);
} else {
/*
* The module is thread-safe. Don't give it a mutex.
*/
node->mutex = NULL;
}
#endif
rbtree_insert(instance_tree, node);
return node;
}
static indexed_modcallable *lookup_by_index(rbtree_t *components,
rlm_components_t comp, int idx)
{
indexed_modcallable myc;
myc.comp = comp;
myc.idx = idx;
return rbtree_finddata(components, &myc);
}
/*
* Create a new sublist.
*/
static indexed_modcallable *new_sublist(CONF_SECTION *cs,
rbtree_t *components, rlm_components_t comp, int idx)
{
indexed_modcallable *c;
c = lookup_by_index(components, comp, idx);
/* It is an error to try to create a sublist that already
* exists. It would almost certainly be caused by accidental
* duplication in the config file.
*
* index 0 is the exception, because it is used when we want
* to collect _all_ listed modules under a single index by
* default, which is currently the case in all components
* except authenticate. */
if (c) {
if (idx == 0) {
return c;
}
return NULL;
}
c = talloc_zero(cs, indexed_modcallable);
c->modulelist = NULL;
c->comp = comp;
c->idx = idx;
if (!rbtree_insert(components, c)) {
talloc_free(c);
return NULL;
}
return c;
}
rlm_rcode_t indexed_modcall(rlm_components_t comp, int idx, REQUEST *request)
{
rlm_rcode_t rcode;
modcallable *list = NULL;
virtual_server_t *server;
/*
* Hack to find the correct virtual server.
*/
server = virtual_server_find(request->server);
if (!server) {
RDEBUG("No such virtual server \"%s\"", request->server);
return RLM_MODULE_FAIL;
}
if (idx == 0) {
list = server->mc[comp];
if (!list) RDEBUG3("Empty %s section. Using default return values.", section_type_value[comp].section);
} else {
indexed_modcallable *this;
this = lookup_by_index(server->components, comp, idx);
if (this) {
list = this->modulelist;
} else {
RWDEBUG2("Unknown value specified for %s. Cannot perform requested action.",
section_type_value[comp].typename);
}
}
if (server->subcs[comp]) {
if (idx == 0) {
RDEBUG("# Executing section %s from file %s",
section_type_value[comp].section,
cf_section_filename(server->subcs[comp]));
} else {
RDEBUG("# Executing group from file %s",
cf_section_filename(server->subcs[comp]));
}
}
request->component = section_type_value[comp].section;
rcode = modcall(comp, list, request);
request->module = "";
request->component = "<core>";
return rcode;
}
/*
* Load a sub-module list, as found inside an Auth-Type foo {}
* block
*/
static int load_subcomponent_section(modcallable *parent, CONF_SECTION *cs,
rbtree_t *components,
DICT_ATTR const *da, rlm_components_t comp)
{
indexed_modcallable *subcomp;
modcallable *ml;
DICT_VALUE *dval;
char const *name2 = cf_section_name2(cs);
/*
* Sanity check.
*/
if (!name2) {
return 1;
}
/*
* Compile the group.
*/
ml = compile_modgroup(parent, comp, cs);
if (!ml) {
return 0;
}
/*
* We must assign a numeric index to this subcomponent.
* It is generated and placed in the dictionary
* automatically. If it isn't found, it's a serious
* error.
*/
dval = dict_valbyname(da->attr, da->vendor, name2);
if (!dval) {
cf_log_err_cs(cs, "%s %s Not previously configured", section_type_value[comp].typename, name2);
talloc_free(ml);
return 0;
}
subcomp = new_sublist(cs, components, comp, dval->value);
if (!subcomp) {
talloc_free(ml);
return 1;
}
subcomp->modulelist = talloc_steal(subcomp, ml);
return 1; /* OK */
}
static int define_type(CONF_SECTION *cs, DICT_ATTR const *da, char const *name)
{
uint32_t value;
DICT_VALUE *dval;
/*
* If the value already exists, don't
* create it again.
*/
dval = dict_valbyname(da->attr, da->vendor, name);
if (dval) return 1;
/*
* Create a new unique value with a
* meaningless number. You can't look at
* it from outside of this code, so it
* doesn't matter. The only requirement
* is that it's unique.
*/
do {
value = fr_rand() & 0x00ffffff;
} while (dict_valbyattr(da->attr, da->vendor, value));
cf_log_module(cs, "Creating %s = %s", da->name, name);
if (dict_addvalue(name, da->name, value) < 0) {
ERROR("%s", fr_strerror());
return 0;
}
return 1;
}
/*
* Don't complain too often.
*/
#define MAX_IGNORED (32)
static int last_ignored = -1;
static char const *ignored[MAX_IGNORED];
static int load_component_section(CONF_SECTION *cs,
rbtree_t *components, rlm_components_t comp)
{
modcallable *this;
CONF_ITEM *modref;
int idx;
indexed_modcallable *subcomp;
char const *modname;
DICT_ATTR const *da;
/*
* Find the attribute used to store VALUEs for this section.
*/
da = dict_attrbyvalue(section_type_value[comp].attr, 0);
if (!da) {
cf_log_err_cs(cs,
"No such attribute %s",
section_type_value[comp].typename);
return -1;
}
/*
* Loop over the entries in the named section, loading
* the sections this time.
*/
for (modref = cf_item_find_next(cs, NULL);
modref != NULL;
modref = cf_item_find_next(cs, modref)) {
char const *name1;
CONF_PAIR *cp = NULL;
CONF_SECTION *scs = NULL;
if (cf_item_is_section(modref)) {
scs = cf_itemtosection(modref);
name1 = cf_section_name1(scs);
if (strcmp(name1,
section_type_value[comp].typename) == 0) {
if (!load_subcomponent_section(NULL, scs,
components,
da,
comp)) {
return -1; /* FIXME: memleak? */
}
continue;
}
cp = NULL;
} else if (cf_item_is_pair(modref)) {
cp = cf_itemtopair(modref);
} else {
continue; /* ignore it */
}
/*
* Look for Auth-Type foo {}, which are special
* cases of named sections, and allowable ONLY
* at the top-level.
*
* i.e. They're not allowed in a "group" or "redundant"
* subsection.
*/
if (comp == RLM_COMPONENT_AUTH) {
DICT_VALUE *dval;
char const *modrefname = NULL;
if (cp) {
modrefname = cf_pair_attr(cp);
} else {
modrefname = cf_section_name2(scs);
if (!modrefname) {
talloc_free(this);
cf_log_err_cs(cs,
"Errors parsing %s sub-section.\n",
cf_section_name1(scs));
return -1;
}
}
dval = dict_valbyname(PW_AUTH_TYPE, 0, modrefname);
if (!dval) {
/*
* It's a section, but nothing we
* recognize. Die!
*/
talloc_free(this);
cf_log_err_cs(cs,