/*
* security/tomoyo/domain.c
*
- * Domain transition functions for TOMOYO.
- *
- * Copyright (C) 2005-2010 NTT DATA CORPORATION
+ * Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include "common.h"
static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
- return a->type == b->type;
+ return a->type == b->type && a->cond == b->cond;
}
/**
struct tomoyo_acl_info *entry;
struct list_head * const list = param->list;
+ if (param->data[0]) {
+ new_entry->cond = tomoyo_get_condition(param);
+ if (!new_entry->cond)
+ return -EINVAL;
+ }
if (mutex_lock_interruptible(&tomoyo_policy_lock))
- return error;
+ goto out;
list_for_each_entry_rcu(entry, list, list) {
if (!tomoyo_same_acl_head(entry, new_entry) ||
!check_duplicate(entry, new_entry))
}
}
mutex_unlock(&tomoyo_policy_lock);
+out:
+ tomoyo_put_condition(new_entry->cond);
return error;
}
+/**
+ * tomoyo_check_acl - Do permission check.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @check_entry: Callback function to check type specific parameters.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
void tomoyo_check_acl(struct tomoyo_request_info *r,
bool (*check_entry) (struct tomoyo_request_info *,
const struct tomoyo_acl_info *))
{
const struct tomoyo_domain_info *domain = r->domain;
struct tomoyo_acl_info *ptr;
+ bool retried = false;
+ const struct list_head *list = &domain->acl_info_list;
- list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
+retry:
+ list_for_each_entry_rcu(ptr, list, list) {
if (ptr->is_deleted || ptr->type != r->param_type)
continue;
- if (check_entry(r, ptr)) {
- r->granted = true;
- return;
- }
+ if (!check_entry(r, ptr))
+ continue;
+ if (!tomoyo_condition(r, ptr->cond))
+ continue;
+ r->granted = true;
+ return;
+ }
+ if (!retried) {
+ retried = true;
+ list = &domain->ns->acl_group[domain->group];
+ goto retry;
}
r->granted = false;
}
/* The list for "struct tomoyo_domain_info". */
LIST_HEAD(tomoyo_domain_list);
-struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY];
-struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP];
-
/**
* tomoyo_last_word - Get last component of a domainname.
*
- * @domainname: Domainname to check.
+ * @name: Domainname to check.
*
* Returns the last word of @domainname.
*/
static const char *tomoyo_last_word(const char *name)
{
- const char *cp = strrchr(name, ' ');
- if (cp)
- return cp + 1;
- return name;
+ const char *cp = strrchr(name, ' ');
+ if (cp)
+ return cp + 1;
+ return name;
}
/**
if (!e.domainname)
goto out;
}
- param->list = &tomoyo_policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+ param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_transition_control);
out:
}
/**
- * tomoyo_transition_type - Get domain transition type.
+ * tomoyo_scan_transition - Try to find specific domain transition type.
*
- * @domainname: The name of domain.
- * @program: The name of program.
+ * @list: Pointer to "struct list_head".
+ * @domainname: The name of current domain.
+ * @program: The name of requested program.
+ * @last_name: The last component of @domainname.
+ * @type: One of values in "enum tomoyo_transition_type".
*
- * Returns TOMOYO_TRANSITION_CONTROL_INITIALIZE if executing @program
- * reinitializes domain transition, TOMOYO_TRANSITION_CONTROL_KEEP if executing
- * @program suppresses domain transition, others otherwise.
+ * Returns true if found one, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
-static u8 tomoyo_transition_type(const struct tomoyo_path_info *domainname,
- const struct tomoyo_path_info *program)
+static inline bool tomoyo_scan_transition
+(const struct list_head *list, const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program, const char *last_name,
+ const enum tomoyo_transition_type type)
{
const struct tomoyo_transition_control *ptr;
- const char *last_name = tomoyo_last_word(domainname->name);
- u8 type;
- for (type = 0; type < TOMOYO_MAX_TRANSITION_TYPE; type++) {
- next:
- list_for_each_entry_rcu(ptr, &tomoyo_policy_list
- [TOMOYO_ID_TRANSITION_CONTROL],
- head.list) {
- if (ptr->head.is_deleted || ptr->type != type)
- continue;
- if (ptr->domainname) {
- if (!ptr->is_last_name) {
- if (ptr->domainname != domainname)
- continue;
- } else {
- /*
- * Use direct strcmp() since this is
- * unlikely used.
- */
- if (strcmp(ptr->domainname->name,
- last_name))
- continue;
- }
- }
- if (ptr->program &&
- tomoyo_pathcmp(ptr->program, program))
- continue;
- if (type == TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) {
+ list_for_each_entry_rcu(ptr, list, head.list) {
+ if (ptr->head.is_deleted || ptr->type != type)
+ continue;
+ if (ptr->domainname) {
+ if (!ptr->is_last_name) {
+ if (ptr->domainname != domainname)
+ continue;
+ } else {
/*
- * Do not check for initialize_domain if
- * no_initialize_domain matched.
+ * Use direct strcmp() since this is
+ * unlikely used.
*/
- type = TOMOYO_TRANSITION_CONTROL_NO_KEEP;
- goto next;
+ if (strcmp(ptr->domainname->name, last_name))
+ continue;
}
- goto done;
}
+ if (ptr->program && tomoyo_pathcmp(ptr->program, program))
+ continue;
+ return true;
+ }
+ return false;
+}
+
+/**
+ * tomoyo_transition_type - Get domain transition type.
+ *
+ * @ns: Pointer to "struct tomoyo_policy_namespace".
+ * @domainname: The name of current domain.
+ * @program: The name of requested program.
+ *
+ * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
+ * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
+ * executing @program reinitializes domain transition within that namespace,
+ * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
+ * others otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static enum tomoyo_transition_type tomoyo_transition_type
+(const struct tomoyo_policy_namespace *ns,
+ const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program)
+{
+ const char *last_name = tomoyo_last_word(domainname->name);
+ enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
+ while (type < TOMOYO_MAX_TRANSITION_TYPE) {
+ const struct list_head * const list =
+ &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+ if (!tomoyo_scan_transition(list, domainname, program,
+ last_name, type)) {
+ type++;
+ continue;
+ }
+ if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
+ type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
+ break;
+ /*
+ * Do not check for reset_domain if no_reset_domain matched.
+ * Do not check for initialize_domain if no_initialize_domain
+ * matched.
+ */
+ type++;
+ type++;
}
- done:
return type;
}
if (!e.original_name || !e.aggregated_name ||
e.aggregated_name->is_patterned) /* No patterns allowed. */
goto out;
- param->list = &tomoyo_policy_list[TOMOYO_ID_AGGREGATOR];
+ param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR];
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_aggregator);
out:
}
/**
- * tomoyo_assign_domain - Create a domain.
+ * tomoyo_find_namespace - Find specified namespace.
*
- * @domainname: The name of domain.
- * @profile: Profile number to assign if the domain was newly created.
+ * @name: Name of namespace to find.
+ * @len: Length of @name.
*
- * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ * Returns pointer to "struct tomoyo_policy_namespace" if found,
+ * NULL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
-struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
- const u8 profile)
+static struct tomoyo_policy_namespace *tomoyo_find_namespace
+(const char *name, const unsigned int len)
{
- struct tomoyo_domain_info *entry;
- struct tomoyo_domain_info *domain = NULL;
- const struct tomoyo_path_info *saved_domainname;
- bool found = false;
+ struct tomoyo_policy_namespace *ns;
+ list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
+ if (strncmp(name, ns->name, len) ||
+ (name[len] && name[len] != ' '))
+ continue;
+ return ns;
+ }
+ return NULL;
+}
- if (!tomoyo_correct_domain(domainname))
+/**
+ * tomoyo_assign_namespace - Create a new namespace.
+ *
+ * @domainname: Name of namespace to create.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" on success,
+ * NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
+{
+ struct tomoyo_policy_namespace *ptr;
+ struct tomoyo_policy_namespace *entry;
+ const char *cp = domainname;
+ unsigned int len = 0;
+ while (*cp && *cp++ != ' ')
+ len++;
+ ptr = tomoyo_find_namespace(domainname, len);
+ if (ptr)
+ return ptr;
+ if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
return NULL;
- saved_domainname = tomoyo_get_name(domainname);
- if (!saved_domainname)
+ entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS);
+ if (!entry)
return NULL;
- entry = kzalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
- list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
- if (domain->is_deleted ||
- tomoyo_pathcmp(saved_domainname, domain->domainname))
- continue;
- found = true;
- break;
- }
- if (!found && tomoyo_memory_ok(entry)) {
- INIT_LIST_HEAD(&entry->acl_info_list);
- entry->domainname = saved_domainname;
- saved_domainname = NULL;
- entry->profile = profile;
- list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
- domain = entry;
+ ptr = tomoyo_find_namespace(domainname, len);
+ if (!ptr && tomoyo_memory_ok(entry)) {
+ char *name = (char *) (entry + 1);
+ ptr = entry;
+ memmove(name, domainname, len);
+ name[len] = '\0';
+ entry->name = name;
+ tomoyo_init_policy_namespace(entry);
entry = NULL;
- found = true;
}
mutex_unlock(&tomoyo_policy_lock);
- out:
- tomoyo_put_name(saved_domainname);
+out:
kfree(entry);
- return found ? domain : NULL;
+ return ptr;
+}
+
+/**
+ * tomoyo_namespace_jump - Check for namespace jump.
+ *
+ * @domainname: Name of domain.
+ *
+ * Returns true if namespace differs, false otherwise.
+ */
+static bool tomoyo_namespace_jump(const char *domainname)
+{
+ const char *namespace = tomoyo_current_namespace()->name;
+ const int len = strlen(namespace);
+ return strncmp(domainname, namespace, len) ||
+ (domainname[len] && domainname[len] != ' ');
+}
+
+/**
+ * tomoyo_assign_domain - Create a domain or a namespace.
+ *
+ * @domainname: The name of domain.
+ * @transit: True if transit to domain found or created.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
+ const bool transit)
+{
+ struct tomoyo_domain_info e = { };
+ struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
+ bool created = false;
+ if (entry) {
+ if (transit) {
+ /*
+ * Since namespace is created at runtime, profiles may
+ * not be created by the moment the process transits to
+ * that domain. Do not perform domain transition if
+ * profile for that domain is not yet created.
+ */
+ if (!entry->ns->profile_ptr[entry->profile])
+ return NULL;
+ }
+ return entry;
+ }
+ /* Requested domain does not exist. */
+ /* Don't create requested domain if domainname is invalid. */
+ if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
+ !tomoyo_correct_domain(domainname))
+ return NULL;
+ /*
+ * Since definition of profiles and acl_groups may differ across
+ * namespaces, do not inherit "use_profile" and "use_group" settings
+ * by automatically creating requested domain upon domain transition.
+ */
+ if (transit && tomoyo_namespace_jump(domainname))
+ return NULL;
+ e.ns = tomoyo_assign_namespace(domainname);
+ if (!e.ns)
+ return NULL;
+ /*
+ * "use_profile" and "use_group" settings for automatically created
+ * domains are inherited from current domain. These are 0 for manually
+ * created domains.
+ */
+ if (transit) {
+ const struct tomoyo_domain_info *domain = tomoyo_domain();
+ e.profile = domain->profile;
+ e.group = domain->group;
+ }
+ e.domainname = tomoyo_get_name(domainname);
+ if (!e.domainname)
+ return NULL;
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
+ entry = tomoyo_find_domain(domainname);
+ if (!entry) {
+ entry = tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ INIT_LIST_HEAD(&entry->acl_info_list);
+ list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
+ created = true;
+ }
+ }
+ mutex_unlock(&tomoyo_policy_lock);
+out:
+ tomoyo_put_name(e.domainname);
+ if (entry && transit) {
+ if (created) {
+ struct tomoyo_request_info r;
+ tomoyo_init_request_info(&r, entry,
+ TOMOYO_MAC_FILE_EXECUTE);
+ r.granted = false;
+ tomoyo_write_log(&r, "use_profile %u\n",
+ entry->profile);
+ tomoyo_write_log(&r, "use_group %u\n", entry->group);
+ }
+ }
+ return entry;
}
/**
*/
int tomoyo_find_next_domain(struct linux_binprm *bprm)
{
- struct tomoyo_request_info r;
- char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
struct tomoyo_domain_info *old_domain = tomoyo_domain();
struct tomoyo_domain_info *domain = NULL;
const char *original_name = bprm->filename;
- u8 mode;
- bool is_enforce;
int retval = -ENOMEM;
bool need_kfree = false;
+ bool reject_on_transition_failure = false;
struct tomoyo_path_info rn = { }; /* real name */
-
- mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
- is_enforce = (mode == TOMOYO_CONFIG_ENFORCING);
- if (!tmp)
- goto out;
-
+ struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
+ if (!ee)
+ return -ENOMEM;
+ ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
+ if (!ee->tmp) {
+ kfree(ee);
+ return -ENOMEM;
+ }
+ /* ee->dump->data is allocated by tomoyo_dump_page(). */
+ tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
+ ee->r.ee = ee;
+ ee->bprm = bprm;
+ ee->r.obj = &ee->obj;
+ ee->obj.path1 = bprm->file->f_path;
retry:
if (need_kfree) {
kfree(rn.name);
/* Check 'aggregator' directive. */
{
struct tomoyo_aggregator *ptr;
- list_for_each_entry_rcu(ptr, &tomoyo_policy_list
- [TOMOYO_ID_AGGREGATOR], head.list) {
+ struct list_head *list =
+ &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
+ /* Check 'aggregator' directive. */
+ list_for_each_entry_rcu(ptr, list, head.list) {
if (ptr->head.is_deleted ||
!tomoyo_path_matches_pattern(&rn,
ptr->original_name))
}
/* Check execute permission. */
- retval = tomoyo_path_permission(&r, TOMOYO_TYPE_EXECUTE, &rn);
+ retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn);
if (retval == TOMOYO_RETRY_REQUEST)
goto retry;
if (retval < 0)
* wildcard) rather than the pathname passed to execve()
* (which never contains wildcard).
*/
- if (r.param.path.matched_path) {
+ if (ee->r.param.path.matched_path) {
if (need_kfree)
kfree(rn.name);
need_kfree = false;
/* This is OK because it is read only. */
- rn = *r.param.path.matched_path;
+ rn = *ee->r.param.path.matched_path;
}
/* Calculate domain to transit to. */
- switch (tomoyo_transition_type(old_domain->domainname, &rn)) {
+ switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
+ &rn)) {
+ case TOMOYO_TRANSITION_CONTROL_RESET:
+ /* Transit to the root of specified namespace. */
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
+ /*
+ * Make do_execve() fail if domain transition across namespaces
+ * has failed.
+ */
+ reject_on_transition_failure = true;
+ break;
case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
- /* Transit to the child of tomoyo_kernel_domain domain. */
- snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, TOMOYO_ROOT_NAME " "
- "%s", rn.name);
+ /* Transit to the child of current namespace's root. */
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ old_domain->ns->name, rn.name);
break;
case TOMOYO_TRANSITION_CONTROL_KEEP:
/* Keep current domain. */
domain = old_domain;
} else {
/* Normal domain transition. */
- snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
old_domain->domainname->name, rn.name);
}
break;
}
- if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10)
- goto done;
- domain = tomoyo_find_domain(tmp);
if (!domain)
- domain = tomoyo_assign_domain(tmp, old_domain->profile);
- done:
+ domain = tomoyo_assign_domain(ee->tmp, true);
if (domain)
- goto out;
- printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp);
- if (is_enforce)
- retval = -EPERM;
- else
- old_domain->transition_failed = true;
+ retval = 0;
+ else if (reject_on_transition_failure) {
+ printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n",
+ ee->tmp);
+ retval = -ENOMEM;
+ } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
+ retval = -ENOMEM;
+ else {
+ retval = 0;
+ if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
+ old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
+ ee->r.granted = false;
+ tomoyo_write_log(&ee->r, "%s", tomoyo_dif
+ [TOMOYO_DIF_TRANSITION_FAILED]);
+ printk(KERN_WARNING
+ "ERROR: Domain '%s' not defined.\n", ee->tmp);
+ }
+ }
out:
if (!domain)
domain = old_domain;
bprm->cred->security = domain;
if (need_kfree)
kfree(rn.name);
- kfree(tmp);
+ kfree(ee->tmp);
+ kfree(ee->dump.data);
+ kfree(ee);
return retval;
}
+
+/**
+ * tomoyo_dump_page - Dump a page to buffer.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @pos: Location to dump.
+ * @dump: Poiner to "struct tomoyo_page_dump".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
+ struct tomoyo_page_dump *dump)
+{
+ struct page *page;
+ /* dump->data is released by tomoyo_finish_execve(). */
+ if (!dump->data) {
+ dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
+ if (!dump->data)
+ return false;
+ }
+ /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
+#ifdef CONFIG_MMU
+ if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0)
+ return false;
+#else
+ page = bprm->page[pos / PAGE_SIZE];
+#endif
+ if (page != dump->page) {
+ const unsigned int offset = pos % PAGE_SIZE;
+ /*
+ * Maybe kmap()/kunmap() should be used here.
+ * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
+ * So do I.
+ */
+ char *kaddr = kmap_atomic(page, KM_USER0);
+ dump->page = page;
+ memcpy(dump->data + offset, kaddr + offset,
+ PAGE_SIZE - offset);
+ kunmap_atomic(kaddr, KM_USER0);
+ }
+ /* Same with put_arg_page(page) in fs/exec.c */
+#ifdef CONFIG_MMU
+ put_page(page);
+#endif
+ return true;
+}
projects / ~andy / linux / blobdiff