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SELinux: Add a capabilities bitmap to SELinux policy version 22

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Add a new policy capabilities bitmap to SELinux policy version 22.  This bitmap
will enable the security server to query the policy to determine which features
it supports.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2008-01-29 08:38:19 -05:00 committed by James Morris
parent 224dfbd81e
commit 3bb56b25db
6 changed files with 185 additions and 8 deletions
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2
security/selinux/Kconfig
View File

@ -145,7 +145,7 @@ config SECURITY_SELINUX_POLICYDB_VERSION_MAX
config SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
int "NSA SELinux maximum supported policy format version value"
depends on SECURITY_SELINUX_POLICYDB_VERSION_MAX
range 15 21
range 15 22
default 19
help
This option sets the value for the maximum policy format version

15
security/selinux/include/security.h
View File

@ -25,13 +25,14 @@
#define POLICYDB_VERSION_MLS 19
#define POLICYDB_VERSION_AVTAB 20
#define POLICYDB_VERSION_RANGETRANS 21
#define POLICYDB_VERSION_POLCAP 22
/* Range of policy versions we understand*/
#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
#define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
#else
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_RANGETRANS
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_POLCAP
#endif
struct netlbl_lsm_secattr;
@ -39,8 +40,19 @@ struct netlbl_lsm_secattr;
extern int selinux_enabled;
extern int selinux_mls_enabled;
/* Policy capabilities */
enum {
POLICYDB_CAPABILITY_NETPEER,
__POLICYDB_CAPABILITY_MAX
};
#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
extern int selinux_policycap_netpeer;
int security_load_policy(void * data, size_t len);
int security_policycap_supported(unsigned int req_cap);
#define SEL_VEC_MAX 32
struct av_decision {
u32 allowed;
@ -91,6 +103,7 @@ int security_get_classes(char ***classes, int *nclasses);
int security_get_permissions(char *class, char ***perms, int *nperms);
int security_get_reject_unknown(void);
int security_get_allow_unknown(void);
int security_get_policycaps(int *len, int **values);
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */

89
security/selinux/selinuxfs.c
View File

@ -2,6 +2,11 @@
*
* Added conditional policy language extensions
*
* Updated: Hewlett-Packard <paul.moore@hp.com>
*
* Added support for the policy capability bitmap
*
* Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
* This program is free software; you can redistribute it and/or modify
@ -35,6 +40,11 @@
#include "objsec.h"
#include "conditional.h"
/* Policy capability filenames */
static char *policycap_names[] = {
"network_peer_controls"
};
unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
#ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
@ -72,6 +82,9 @@ static int *bool_pending_values = NULL;
static struct dentry *class_dir = NULL;
static unsigned long last_class_ino;
/* global data for policy capabilities */
static struct dentry *policycap_dir = NULL;
extern void selnl_notify_setenforce(int val);
/* Check whether a task is allowed to use a security operation. */
@ -111,10 +124,11 @@ enum sel_inos {
static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
#define SEL_INITCON_INO_OFFSET 0x01000000
#define SEL_BOOL_INO_OFFSET 0x02000000
#define SEL_CLASS_INO_OFFSET 0x04000000
#define SEL_INO_MASK 0x00ffffff
#define SEL_INITCON_INO_OFFSET 0x01000000
#define SEL_BOOL_INO_OFFSET 0x02000000
#define SEL_CLASS_INO_OFFSET 0x04000000
#define SEL_POLICYCAP_INO_OFFSET 0x08000000
#define SEL_INO_MASK 0x00ffffff
#define TMPBUFLEN 12
static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
@ -263,6 +277,7 @@ static const struct file_operations sel_policyvers_ops = {
/* declaration for sel_write_load */
static int sel_make_bools(void);
static int sel_make_classes(void);
static int sel_make_policycap(void);
/* declaration for sel_make_class_dirs */
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
@ -323,6 +338,12 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf,
}
ret = sel_make_classes();
if (ret) {
length = ret;
goto out1;
}
ret = sel_make_policycap();
if (ret)
length = ret;
else
@ -1399,6 +1420,24 @@ static const struct file_operations sel_perm_ops = {
.read = sel_read_perm,
};
static ssize_t sel_read_policycap(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
int value;
char tmpbuf[TMPBUFLEN];
ssize_t length;
unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
value = security_policycap_supported(i_ino & SEL_INO_MASK);
length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}
static const struct file_operations sel_policycap_ops = {
.read = sel_read_policycap,
};
static int sel_make_perm_files(char *objclass, int classvalue,
struct dentry *dir)
{
@ -1545,6 +1584,36 @@ out:
return rc;
}
static int sel_make_policycap(void)
{
unsigned int iter;
struct dentry *dentry = NULL;
struct inode *inode = NULL;
sel_remove_entries(policycap_dir);
for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
if (iter < ARRAY_SIZE(policycap_names))
dentry = d_alloc_name(policycap_dir,
policycap_names[iter]);
else
dentry = d_alloc_name(policycap_dir, "unknown");
if (dentry == NULL)
return -ENOMEM;
inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
if (inode == NULL)
return -ENOMEM;
inode->i_fop = &sel_policycap_ops;
inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
d_add(dentry, inode);
}
return 0;
}
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
unsigned long *ino)
{
@ -1673,6 +1742,18 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
class_dir = dentry;
dentry = d_alloc_name(sb->s_root, "policy_capabilities");
if (!dentry) {
ret = -ENOMEM;
goto err;
}
ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
if (ret)
goto err;
policycap_dir = dentry;
out:
return ret;
err:

18
security/selinux/ss/policydb.c
View File

@ -13,6 +13,11 @@
*
* Added conditional policy language extensions
*
* Updated: Hewlett-Packard <paul.moore@hp.com>
*
* Added support for the policy capability bitmap
*
* Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
* This program is free software; you can redistribute it and/or modify
@ -102,6 +107,11 @@ static struct policydb_compat_info policydb_compat[] = {
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
},
{
.version = POLICYDB_VERSION_POLCAP,
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
}
};
static struct policydb_compat_info *policydb_lookup_compat(int version)
@ -183,6 +193,8 @@ static int policydb_init(struct policydb *p)
if (rc)
goto out_free_symtab;
ebitmap_init(&p->policycaps);
out:
return rc;
@ -673,8 +685,8 @@ void policydb_destroy(struct policydb *p)
ebitmap_destroy(&p->type_attr_map[i]);
}
kfree(p->type_attr_map);
kfree(p->undefined_perms);
ebitmap_destroy(&p->policycaps);
return;
}
@ -1554,6 +1566,10 @@ int policydb_read(struct policydb *p, void *fp)
p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
if (p->policyvers >= POLICYDB_VERSION_POLCAP &&
ebitmap_read(&p->policycaps, fp) != 0)
goto bad;
info = policydb_lookup_compat(p->policyvers);
if (!info) {
printk(KERN_ERR "security: unable to find policy compat info "

2
security/selinux/ss/policydb.h
View File

@ -241,6 +241,8 @@ struct policydb {
/* type -> attribute reverse mapping */
struct ebitmap *type_attr_map;
struct ebitmap policycaps;
unsigned int policyvers;
unsigned int reject_unknown : 1;

67
security/selinux/ss/services.c
View File

@ -16,12 +16,13 @@
* Updated: Hewlett-Packard <paul.moore@hp.com>
*
* Added support for NetLabel
* Added support for the policy capability bitmap
*
* Updated: Chad Sellers <csellers@tresys.com>
*
* Added validation of kernel classes and permissions
*
* Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
* Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
@ -59,6 +60,8 @@
extern void selnl_notify_policyload(u32 seqno);
unsigned int policydb_loaded_version;
int selinux_policycap_netpeer;
/*
* This is declared in avc.c
*/
@ -1299,6 +1302,12 @@ bad:
goto out;
}
static void security_load_policycaps(void)
{
selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
POLICYDB_CAPABILITY_NETPEER);
}
extern void selinux_complete_init(void);
static int security_preserve_bools(struct policydb *p);
@ -1346,6 +1355,7 @@ int security_load_policy(void *data, size_t len)
avtab_cache_destroy();
return -EINVAL;
}
security_load_policycaps();
policydb_loaded_version = policydb.policyvers;
ss_initialized = 1;
seqno = ++latest_granting;
@ -1404,6 +1414,7 @@ int security_load_policy(void *data, size_t len)
POLICY_WRLOCK;
memcpy(&policydb, &newpolicydb, sizeof policydb);
sidtab_set(&sidtab, &newsidtab);
security_load_policycaps();
seqno = ++latest_granting;
policydb_loaded_version = policydb.policyvers;
POLICY_WRUNLOCK;
@ -2148,6 +2159,60 @@ int security_get_allow_unknown(void)
return policydb.allow_unknown;
}
/**
* security_get_policycaps - Query the loaded policy for its capabilities
* @len: the number of capability bits
* @values: the capability bit array
*
* Description:
* Get an array of the policy capabilities in @values where each entry in
* @values is either true (1) or false (0) depending the policy's support of
* that feature. The policy capabilities are defined by the
* POLICYDB_CAPABILITY_* enums. The size of the array is stored in @len and it
* is up to the caller to free the array in @values. Returns zero on success,
* negative values on failure.
*
*/
int security_get_policycaps(int *len, int **values)
{
int rc = -ENOMEM;
unsigned int iter;
POLICY_RDLOCK;
*values = kcalloc(POLICYDB_CAPABILITY_MAX, sizeof(int), GFP_ATOMIC);
if (*values == NULL)
goto out;
for (iter = 0; iter < POLICYDB_CAPABILITY_MAX; iter++)
(*values)[iter] = ebitmap_get_bit(&policydb.policycaps, iter);
*len = POLICYDB_CAPABILITY_MAX;
out:
POLICY_RDUNLOCK;
return rc;
}
/**
* security_policycap_supported - Check for a specific policy capability
* @req_cap: capability
*
* Description:
* This function queries the currently loaded policy to see if it supports the
* capability specified by @req_cap. Returns true (1) if the capability is
* supported, false (0) if it isn't supported.
*
*/
int security_policycap_supported(unsigned int req_cap)
{
int rc;
POLICY_RDLOCK;
rc = ebitmap_get_bit(&policydb.policycaps, req_cap);
POLICY_RDUNLOCK;
return rc;
}
struct selinux_audit_rule {
u32 au_seqno;
struct context au_ctxt;