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Diffstat (limited to 'security/tomoyo/domain.c')
-rw-r--r--security/tomoyo/domain.c209
1 files changed, 172 insertions, 37 deletions
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index cd0f92d88bb4..9027ac1534af 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -39,6 +39,8 @@ int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
if (mutex_lock_interruptible(&tomoyo_policy_lock))
return -ENOMEM;
list_for_each_entry_rcu(entry, list, list) {
+ if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
+ continue;
if (!check_duplicate(entry, new_entry))
continue;
entry->is_deleted = param->is_delete;
@@ -102,10 +104,21 @@ int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
new_entry->cond = tomoyo_get_condition(param);
if (!new_entry->cond)
return -EINVAL;
+ /*
+ * Domain transition preference is allowed for only
+ * "file execute" entries.
+ */
+ if (new_entry->cond->transit &&
+ !(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
+ container_of(new_entry, struct tomoyo_path_acl, head)
+ ->perm == 1 << TOMOYO_TYPE_EXECUTE))
+ goto out;
}
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(entry, list, list) {
+ if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
+ continue;
if (!tomoyo_same_acl_head(entry, new_entry) ||
!check_duplicate(entry, new_entry))
continue;
@@ -157,6 +170,7 @@ retry:
continue;
if (!tomoyo_condition(r, ptr->cond))
continue;
+ r->matched_acl = ptr;
r->granted = true;
return;
}
@@ -501,7 +515,8 @@ struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
* that domain. Do not perform domain transition if
* profile for that domain is not yet created.
*/
- if (!entry->ns->profile_ptr[entry->profile])
+ if (tomoyo_policy_loaded &&
+ !entry->ns->profile_ptr[entry->profile])
return NULL;
}
return entry;
@@ -557,12 +572,99 @@ out:
tomoyo_write_log(&r, "use_profile %u\n",
entry->profile);
tomoyo_write_log(&r, "use_group %u\n", entry->group);
+ tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
}
}
return entry;
}
/**
+ * tomoyo_environ - Check permission for environment variable names.
+ *
+ * @ee: Pointer to "struct tomoyo_execve".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_environ(struct tomoyo_execve *ee)
+{
+ struct tomoyo_request_info *r = &ee->r;
+ struct linux_binprm *bprm = ee->bprm;
+ /* env_page.data is allocated by tomoyo_dump_page(). */
+ struct tomoyo_page_dump env_page = { };
+ char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
+ int arg_len = 0;
+ unsigned long pos = bprm->p;
+ int offset = pos % PAGE_SIZE;
+ int argv_count = bprm->argc;
+ int envp_count = bprm->envc;
+ int error = -ENOMEM;
+
+ ee->r.type = TOMOYO_MAC_ENVIRON;
+ ee->r.profile = r->domain->profile;
+ ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
+ TOMOYO_MAC_ENVIRON);
+ if (!r->mode || !envp_count)
+ return 0;
+ arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
+ if (!arg_ptr)
+ goto out;
+ while (error == -ENOMEM) {
+ if (!tomoyo_dump_page(bprm, pos, &env_page))
+ goto out;
+ pos += PAGE_SIZE - offset;
+ /* Read. */
+ while (argv_count && offset < PAGE_SIZE) {
+ if (!env_page.data[offset++])
+ argv_count--;
+ }
+ if (argv_count) {
+ offset = 0;
+ continue;
+ }
+ while (offset < PAGE_SIZE) {
+ const unsigned char c = env_page.data[offset++];
+
+ if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
+ if (c == '=') {
+ arg_ptr[arg_len++] = '\0';
+ } else if (c == '\\') {
+ arg_ptr[arg_len++] = '\\';
+ arg_ptr[arg_len++] = '\\';
+ } else if (c > ' ' && c < 127) {
+ arg_ptr[arg_len++] = c;
+ } else {
+ arg_ptr[arg_len++] = '\\';
+ arg_ptr[arg_len++] = (c >> 6) + '0';
+ arg_ptr[arg_len++]
+ = ((c >> 3) & 7) + '0';
+ arg_ptr[arg_len++] = (c & 7) + '0';
+ }
+ } else {
+ arg_ptr[arg_len] = '\0';
+ }
+ if (c)
+ continue;
+ if (tomoyo_env_perm(r, arg_ptr)) {
+ error = -EPERM;
+ break;
+ }
+ if (!--envp_count) {
+ error = 0;
+ break;
+ }
+ arg_len = 0;
+ }
+ offset = 0;
+ }
+out:
+ if (r->mode != TOMOYO_CONFIG_ENFORCING)
+ error = 0;
+ kfree(env_page.data);
+ kfree(arg_ptr);
+ return error;
+}
+
+/**
* tomoyo_find_next_domain - Find a domain.
*
* @bprm: Pointer to "struct linux_binprm".
@@ -577,10 +679,11 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
struct tomoyo_domain_info *domain = NULL;
const char *original_name = bprm->filename;
int retval = -ENOMEM;
- bool need_kfree = false;
bool reject_on_transition_failure = false;
- struct tomoyo_path_info rn = { }; /* real name */
+ const struct tomoyo_path_info *candidate;
+ struct tomoyo_path_info exename;
struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
+
if (!ee)
return -ENOMEM;
ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
@@ -594,40 +697,32 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
ee->bprm = bprm;
ee->r.obj = &ee->obj;
ee->obj.path1 = bprm->file->f_path;
- retry:
- if (need_kfree) {
- kfree(rn.name);
- need_kfree = false;
- }
/* Get symlink's pathname of program. */
retval = -ENOENT;
- rn.name = tomoyo_realpath_nofollow(original_name);
- if (!rn.name)
+ exename.name = tomoyo_realpath_nofollow(original_name);
+ if (!exename.name)
goto out;
- tomoyo_fill_path_info(&rn);
- need_kfree = true;
-
+ tomoyo_fill_path_info(&exename);
+retry:
/* Check 'aggregator' directive. */
{
struct tomoyo_aggregator *ptr;
struct list_head *list =
&old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
/* Check 'aggregator' directive. */
+ candidate = &exename;
list_for_each_entry_rcu(ptr, list, head.list) {
if (ptr->head.is_deleted ||
- !tomoyo_path_matches_pattern(&rn,
+ !tomoyo_path_matches_pattern(&exename,
ptr->original_name))
continue;
- kfree(rn.name);
- need_kfree = false;
- /* This is OK because it is read only. */
- rn = *ptr->aggregated_name;
+ candidate = ptr->aggregated_name;
break;
}
}
/* Check execute permission. */
- retval = tomoyo_path_permission(&ee->r, TOMOYO_TYPE_EXECUTE, &rn);
+ retval = tomoyo_execute_permission(&ee->r, candidate);
if (retval == TOMOYO_RETRY_REQUEST)
goto retry;
if (retval < 0)
@@ -638,20 +733,51 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
* wildcard) rather than the pathname passed to execve()
* (which never contains wildcard).
*/
- 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 = *ee->r.param.path.matched_path;
- }
+ if (ee->r.param.path.matched_path)
+ candidate = ee->r.param.path.matched_path;
- /* Calculate domain to transit to. */
+ /*
+ * Check for domain transition preference if "file execute" matched.
+ * If preference is given, make do_execve() fail if domain transition
+ * has failed, for domain transition preference should be used with
+ * destination domain defined.
+ */
+ if (ee->transition) {
+ const char *domainname = ee->transition->name;
+ reject_on_transition_failure = true;
+ if (!strcmp(domainname, "keep"))
+ goto force_keep_domain;
+ if (!strcmp(domainname, "child"))
+ goto force_child_domain;
+ if (!strcmp(domainname, "reset"))
+ goto force_reset_domain;
+ if (!strcmp(domainname, "initialize"))
+ goto force_initialize_domain;
+ if (!strcmp(domainname, "parent")) {
+ char *cp;
+ strncpy(ee->tmp, old_domain->domainname->name,
+ TOMOYO_EXEC_TMPSIZE - 1);
+ cp = strrchr(ee->tmp, ' ');
+ if (cp)
+ *cp = '\0';
+ } else if (*domainname == '<')
+ strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
+ else
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ old_domain->domainname->name, domainname);
+ goto force_jump_domain;
+ }
+ /*
+ * No domain transition preference specified.
+ * Calculate domain to transit to.
+ */
switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
- &rn)) {
+ candidate)) {
case TOMOYO_TRANSITION_CONTROL_RESET:
+force_reset_domain:
/* Transit to the root of specified namespace. */
- snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
+ candidate->name);
/*
* Make do_execve() fail if domain transition across namespaces
* has failed.
@@ -659,11 +785,13 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
reject_on_transition_failure = true;
break;
case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
+force_initialize_domain:
/* Transit to the child of current namespace's root. */
snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
- old_domain->ns->name, rn.name);
+ old_domain->ns->name, candidate->name);
break;
case TOMOYO_TRANSITION_CONTROL_KEEP:
+force_keep_domain:
/* Keep current domain. */
domain = old_domain;
break;
@@ -677,13 +805,15 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
* before /sbin/init.
*/
domain = old_domain;
- } else {
- /* Normal domain transition. */
- snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
- old_domain->domainname->name, rn.name);
+ break;
}
+force_child_domain:
+ /* Normal domain transition. */
+ snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+ old_domain->domainname->name, candidate->name);
break;
}
+force_jump_domain:
if (!domain)
domain = tomoyo_assign_domain(ee->tmp, true);
if (domain)
@@ -711,8 +841,11 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
/* Update reference count on "struct tomoyo_domain_info". */
atomic_inc(&domain->users);
bprm->cred->security = domain;
- if (need_kfree)
- kfree(rn.name);
+ kfree(exename.name);
+ if (!retval) {
+ ee->r.domain = domain;
+ retval = tomoyo_environ(ee);
+ }
kfree(ee->tmp);
kfree(ee->dump.data);
kfree(ee);
@@ -732,7 +865,8 @@ 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(). */
+
+ /* dump->data is released by tomoyo_find_next_domain(). */
if (!dump->data) {
dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
if (!dump->data)
@@ -753,6 +887,7 @@ bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
* So do I.
*/
char *kaddr = kmap_atomic(page, KM_USER0);
+
dump->page = page;
memcpy(dump->data + offset, kaddr + offset,
PAGE_SIZE - offset);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 04:35:17 +0000