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selinux: add support for querying object classes and permissions from the running policy 

Add support to the SELinux security server for obtaining a list of classes,
and for obtaining a list of permissions for a specified class.

Signed-off-by: Christopher J. PeBenito <cpebenito@tresys.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Christopher J. PeBenito 2007-05-23 09:12:06 -04:00 committed by James Morris
parent 4eb6bf6bfb
commit 55fcf09b3f
2 changed files with 98 additions and 0 deletions
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3
security/selinux/include/security.h
View File

@ -87,6 +87,9 @@ int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
int security_get_classes(char ***classes, int *nclasses);
int security_get_permissions(char *class, char ***perms, int *nperms);
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */

95
security/selinux/ss/services.c
View File

@ -1996,6 +1996,101 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
return rc;
}
static int get_classes_callback(void *k, void *d, void *args)
{
struct class_datum *datum = d;
char *name = k, **classes = args;
int value = datum->value - 1;
classes[value] = kstrdup(name, GFP_ATOMIC);
if (!classes[value])
return -ENOMEM;
return 0;
}
int security_get_classes(char ***classes, int *nclasses)
{
int rc = -ENOMEM;
POLICY_RDLOCK;
*nclasses = policydb.p_classes.nprim;
*classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC);
if (!*classes)
goto out;
rc = hashtab_map(policydb.p_classes.table, get_classes_callback,
*classes);
if (rc < 0) {
int i;
for (i = 0; i < *nclasses; i++)
kfree((*classes)[i]);
kfree(*classes);
}
out:
POLICY_RDUNLOCK;
return rc;
}
static int get_permissions_callback(void *k, void *d, void *args)
{
struct perm_datum *datum = d;
char *name = k, **perms = args;
int value = datum->value - 1;
perms[value] = kstrdup(name, GFP_ATOMIC);
if (!perms[value])
return -ENOMEM;
return 0;
}
int security_get_permissions(char *class, char ***perms, int *nperms)
{
int rc = -ENOMEM, i;
struct class_datum *match;
POLICY_RDLOCK;
match = hashtab_search(policydb.p_classes.table, class);
if (!match) {
printk(KERN_ERR "%s: unrecognized class %s\n",
__FUNCTION__, class);
rc = -EINVAL;
goto out;
}
*nperms = match->permissions.nprim;
*perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC);
if (!*perms)
goto out;
if (match->comdatum) {
rc = hashtab_map(match->comdatum->permissions.table,
get_permissions_callback, *perms);
if (rc < 0)
goto err;
}
rc = hashtab_map(match->permissions.table, get_permissions_callback,
*perms);
if (rc < 0)
goto err;
out:
POLICY_RDUNLOCK;
return rc;
err:
POLICY_RDUNLOCK;
for (i = 0; i < *nperms; i++)
kfree((*perms)[i]);
kfree(*perms);
return rc;
}
struct selinux_audit_rule {
u32 au_seqno;
struct context au_ctxt;