![Linus Torvalds](/assets/img/avatar_default.png)
This reverts commit 102aefdda4
.
Tom London reports that it causes sync() to hang on Fedora rawhide:
https://bugzilla.redhat.com/show_bug.cgi?id=1033965
and Josh Boyer bisected it down to this commit. Reverting the commit in
the rawhide kernel fixes the problem.
Eric Paris root-caused it to incorrect subtype matching in that commit
breaking fuse, and has a tentative patch, but by now we're better off
retrying this in 3.14 rather than playing with it any more.
Reported-by: Tom London <selinux@gmail.com>
Bisected-by: Josh Boyer <jwboyer@fedoraproject.org>
Acked-by: Eric Paris <eparis@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: Anand Avati <avati@redhat.com>
Cc: Paul Moore <paul@paul-moore.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3251 lines
75 KiB
C
3251 lines
75 KiB
C
/*
|
|
* Implementation of the security services.
|
|
*
|
|
* Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
|
|
* James Morris <jmorris@redhat.com>
|
|
*
|
|
* Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
|
|
*
|
|
* Support for enhanced MLS infrastructure.
|
|
* Support for context based audit filters.
|
|
*
|
|
* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
|
|
*
|
|
* Added conditional policy language extensions
|
|
*
|
|
* Updated: Hewlett-Packard <paul@paul-moore.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
|
|
*
|
|
* Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
|
|
*
|
|
* Added support for bounds domain and audit messaged on masked permissions
|
|
*
|
|
* Updated: Guido Trentalancia <guido@trentalancia.com>
|
|
*
|
|
* Added support for runtime switching of the policy type
|
|
*
|
|
* Copyright (C) 2008, 2009 NEC Corporation
|
|
* 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>
|
|
* 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, version 2.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/in.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/audit.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/selinux.h>
|
|
#include <linux/flex_array.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <net/netlabel.h>
|
|
|
|
#include "flask.h"
|
|
#include "avc.h"
|
|
#include "avc_ss.h"
|
|
#include "security.h"
|
|
#include "context.h"
|
|
#include "policydb.h"
|
|
#include "sidtab.h"
|
|
#include "services.h"
|
|
#include "conditional.h"
|
|
#include "mls.h"
|
|
#include "objsec.h"
|
|
#include "netlabel.h"
|
|
#include "xfrm.h"
|
|
#include "ebitmap.h"
|
|
#include "audit.h"
|
|
|
|
int selinux_policycap_netpeer;
|
|
int selinux_policycap_openperm;
|
|
int selinux_policycap_alwaysnetwork;
|
|
|
|
static DEFINE_RWLOCK(policy_rwlock);
|
|
|
|
static struct sidtab sidtab;
|
|
struct policydb policydb;
|
|
int ss_initialized;
|
|
|
|
/*
|
|
* The largest sequence number that has been used when
|
|
* providing an access decision to the access vector cache.
|
|
* The sequence number only changes when a policy change
|
|
* occurs.
|
|
*/
|
|
static u32 latest_granting;
|
|
|
|
/* Forward declaration. */
|
|
static int context_struct_to_string(struct context *context, char **scontext,
|
|
u32 *scontext_len);
|
|
|
|
static void context_struct_compute_av(struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
struct av_decision *avd);
|
|
|
|
struct selinux_mapping {
|
|
u16 value; /* policy value */
|
|
unsigned num_perms;
|
|
u32 perms[sizeof(u32) * 8];
|
|
};
|
|
|
|
static struct selinux_mapping *current_mapping;
|
|
static u16 current_mapping_size;
|
|
|
|
static int selinux_set_mapping(struct policydb *pol,
|
|
struct security_class_mapping *map,
|
|
struct selinux_mapping **out_map_p,
|
|
u16 *out_map_size)
|
|
{
|
|
struct selinux_mapping *out_map = NULL;
|
|
size_t size = sizeof(struct selinux_mapping);
|
|
u16 i, j;
|
|
unsigned k;
|
|
bool print_unknown_handle = false;
|
|
|
|
/* Find number of classes in the input mapping */
|
|
if (!map)
|
|
return -EINVAL;
|
|
i = 0;
|
|
while (map[i].name)
|
|
i++;
|
|
|
|
/* Allocate space for the class records, plus one for class zero */
|
|
out_map = kcalloc(++i, size, GFP_ATOMIC);
|
|
if (!out_map)
|
|
return -ENOMEM;
|
|
|
|
/* Store the raw class and permission values */
|
|
j = 0;
|
|
while (map[j].name) {
|
|
struct security_class_mapping *p_in = map + (j++);
|
|
struct selinux_mapping *p_out = out_map + j;
|
|
|
|
/* An empty class string skips ahead */
|
|
if (!strcmp(p_in->name, "")) {
|
|
p_out->num_perms = 0;
|
|
continue;
|
|
}
|
|
|
|
p_out->value = string_to_security_class(pol, p_in->name);
|
|
if (!p_out->value) {
|
|
printk(KERN_INFO
|
|
"SELinux: Class %s not defined in policy.\n",
|
|
p_in->name);
|
|
if (pol->reject_unknown)
|
|
goto err;
|
|
p_out->num_perms = 0;
|
|
print_unknown_handle = true;
|
|
continue;
|
|
}
|
|
|
|
k = 0;
|
|
while (p_in->perms && p_in->perms[k]) {
|
|
/* An empty permission string skips ahead */
|
|
if (!*p_in->perms[k]) {
|
|
k++;
|
|
continue;
|
|
}
|
|
p_out->perms[k] = string_to_av_perm(pol, p_out->value,
|
|
p_in->perms[k]);
|
|
if (!p_out->perms[k]) {
|
|
printk(KERN_INFO
|
|
"SELinux: Permission %s in class %s not defined in policy.\n",
|
|
p_in->perms[k], p_in->name);
|
|
if (pol->reject_unknown)
|
|
goto err;
|
|
print_unknown_handle = true;
|
|
}
|
|
|
|
k++;
|
|
}
|
|
p_out->num_perms = k;
|
|
}
|
|
|
|
if (print_unknown_handle)
|
|
printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
|
|
pol->allow_unknown ? "allowed" : "denied");
|
|
|
|
*out_map_p = out_map;
|
|
*out_map_size = i;
|
|
return 0;
|
|
err:
|
|
kfree(out_map);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Get real, policy values from mapped values
|
|
*/
|
|
|
|
static u16 unmap_class(u16 tclass)
|
|
{
|
|
if (tclass < current_mapping_size)
|
|
return current_mapping[tclass].value;
|
|
|
|
return tclass;
|
|
}
|
|
|
|
/*
|
|
* Get kernel value for class from its policy value
|
|
*/
|
|
static u16 map_class(u16 pol_value)
|
|
{
|
|
u16 i;
|
|
|
|
for (i = 1; i < current_mapping_size; i++) {
|
|
if (current_mapping[i].value == pol_value)
|
|
return i;
|
|
}
|
|
|
|
return SECCLASS_NULL;
|
|
}
|
|
|
|
static void map_decision(u16 tclass, struct av_decision *avd,
|
|
int allow_unknown)
|
|
{
|
|
if (tclass < current_mapping_size) {
|
|
unsigned i, n = current_mapping[tclass].num_perms;
|
|
u32 result;
|
|
|
|
for (i = 0, result = 0; i < n; i++) {
|
|
if (avd->allowed & current_mapping[tclass].perms[i])
|
|
result |= 1<<i;
|
|
if (allow_unknown && !current_mapping[tclass].perms[i])
|
|
result |= 1<<i;
|
|
}
|
|
avd->allowed = result;
|
|
|
|
for (i = 0, result = 0; i < n; i++)
|
|
if (avd->auditallow & current_mapping[tclass].perms[i])
|
|
result |= 1<<i;
|
|
avd->auditallow = result;
|
|
|
|
for (i = 0, result = 0; i < n; i++) {
|
|
if (avd->auditdeny & current_mapping[tclass].perms[i])
|
|
result |= 1<<i;
|
|
if (!allow_unknown && !current_mapping[tclass].perms[i])
|
|
result |= 1<<i;
|
|
}
|
|
/*
|
|
* In case the kernel has a bug and requests a permission
|
|
* between num_perms and the maximum permission number, we
|
|
* should audit that denial
|
|
*/
|
|
for (; i < (sizeof(u32)*8); i++)
|
|
result |= 1<<i;
|
|
avd->auditdeny = result;
|
|
}
|
|
}
|
|
|
|
int security_mls_enabled(void)
|
|
{
|
|
return policydb.mls_enabled;
|
|
}
|
|
|
|
/*
|
|
* Return the boolean value of a constraint expression
|
|
* when it is applied to the specified source and target
|
|
* security contexts.
|
|
*
|
|
* xcontext is a special beast... It is used by the validatetrans rules
|
|
* only. For these rules, scontext is the context before the transition,
|
|
* tcontext is the context after the transition, and xcontext is the context
|
|
* of the process performing the transition. All other callers of
|
|
* constraint_expr_eval should pass in NULL for xcontext.
|
|
*/
|
|
static int constraint_expr_eval(struct context *scontext,
|
|
struct context *tcontext,
|
|
struct context *xcontext,
|
|
struct constraint_expr *cexpr)
|
|
{
|
|
u32 val1, val2;
|
|
struct context *c;
|
|
struct role_datum *r1, *r2;
|
|
struct mls_level *l1, *l2;
|
|
struct constraint_expr *e;
|
|
int s[CEXPR_MAXDEPTH];
|
|
int sp = -1;
|
|
|
|
for (e = cexpr; e; e = e->next) {
|
|
switch (e->expr_type) {
|
|
case CEXPR_NOT:
|
|
BUG_ON(sp < 0);
|
|
s[sp] = !s[sp];
|
|
break;
|
|
case CEXPR_AND:
|
|
BUG_ON(sp < 1);
|
|
sp--;
|
|
s[sp] &= s[sp + 1];
|
|
break;
|
|
case CEXPR_OR:
|
|
BUG_ON(sp < 1);
|
|
sp--;
|
|
s[sp] |= s[sp + 1];
|
|
break;
|
|
case CEXPR_ATTR:
|
|
if (sp == (CEXPR_MAXDEPTH - 1))
|
|
return 0;
|
|
switch (e->attr) {
|
|
case CEXPR_USER:
|
|
val1 = scontext->user;
|
|
val2 = tcontext->user;
|
|
break;
|
|
case CEXPR_TYPE:
|
|
val1 = scontext->type;
|
|
val2 = tcontext->type;
|
|
break;
|
|
case CEXPR_ROLE:
|
|
val1 = scontext->role;
|
|
val2 = tcontext->role;
|
|
r1 = policydb.role_val_to_struct[val1 - 1];
|
|
r2 = policydb.role_val_to_struct[val2 - 1];
|
|
switch (e->op) {
|
|
case CEXPR_DOM:
|
|
s[++sp] = ebitmap_get_bit(&r1->dominates,
|
|
val2 - 1);
|
|
continue;
|
|
case CEXPR_DOMBY:
|
|
s[++sp] = ebitmap_get_bit(&r2->dominates,
|
|
val1 - 1);
|
|
continue;
|
|
case CEXPR_INCOMP:
|
|
s[++sp] = (!ebitmap_get_bit(&r1->dominates,
|
|
val2 - 1) &&
|
|
!ebitmap_get_bit(&r2->dominates,
|
|
val1 - 1));
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case CEXPR_L1L2:
|
|
l1 = &(scontext->range.level[0]);
|
|
l2 = &(tcontext->range.level[0]);
|
|
goto mls_ops;
|
|
case CEXPR_L1H2:
|
|
l1 = &(scontext->range.level[0]);
|
|
l2 = &(tcontext->range.level[1]);
|
|
goto mls_ops;
|
|
case CEXPR_H1L2:
|
|
l1 = &(scontext->range.level[1]);
|
|
l2 = &(tcontext->range.level[0]);
|
|
goto mls_ops;
|
|
case CEXPR_H1H2:
|
|
l1 = &(scontext->range.level[1]);
|
|
l2 = &(tcontext->range.level[1]);
|
|
goto mls_ops;
|
|
case CEXPR_L1H1:
|
|
l1 = &(scontext->range.level[0]);
|
|
l2 = &(scontext->range.level[1]);
|
|
goto mls_ops;
|
|
case CEXPR_L2H2:
|
|
l1 = &(tcontext->range.level[0]);
|
|
l2 = &(tcontext->range.level[1]);
|
|
goto mls_ops;
|
|
mls_ops:
|
|
switch (e->op) {
|
|
case CEXPR_EQ:
|
|
s[++sp] = mls_level_eq(l1, l2);
|
|
continue;
|
|
case CEXPR_NEQ:
|
|
s[++sp] = !mls_level_eq(l1, l2);
|
|
continue;
|
|
case CEXPR_DOM:
|
|
s[++sp] = mls_level_dom(l1, l2);
|
|
continue;
|
|
case CEXPR_DOMBY:
|
|
s[++sp] = mls_level_dom(l2, l1);
|
|
continue;
|
|
case CEXPR_INCOMP:
|
|
s[++sp] = mls_level_incomp(l2, l1);
|
|
continue;
|
|
default:
|
|
BUG();
|
|
return 0;
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
return 0;
|
|
}
|
|
|
|
switch (e->op) {
|
|
case CEXPR_EQ:
|
|
s[++sp] = (val1 == val2);
|
|
break;
|
|
case CEXPR_NEQ:
|
|
s[++sp] = (val1 != val2);
|
|
break;
|
|
default:
|
|
BUG();
|
|
return 0;
|
|
}
|
|
break;
|
|
case CEXPR_NAMES:
|
|
if (sp == (CEXPR_MAXDEPTH-1))
|
|
return 0;
|
|
c = scontext;
|
|
if (e->attr & CEXPR_TARGET)
|
|
c = tcontext;
|
|
else if (e->attr & CEXPR_XTARGET) {
|
|
c = xcontext;
|
|
if (!c) {
|
|
BUG();
|
|
return 0;
|
|
}
|
|
}
|
|
if (e->attr & CEXPR_USER)
|
|
val1 = c->user;
|
|
else if (e->attr & CEXPR_ROLE)
|
|
val1 = c->role;
|
|
else if (e->attr & CEXPR_TYPE)
|
|
val1 = c->type;
|
|
else {
|
|
BUG();
|
|
return 0;
|
|
}
|
|
|
|
switch (e->op) {
|
|
case CEXPR_EQ:
|
|
s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
|
|
break;
|
|
case CEXPR_NEQ:
|
|
s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
|
|
break;
|
|
default:
|
|
BUG();
|
|
return 0;
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
BUG_ON(sp != 0);
|
|
return s[0];
|
|
}
|
|
|
|
/*
|
|
* security_dump_masked_av - dumps masked permissions during
|
|
* security_compute_av due to RBAC, MLS/Constraint and Type bounds.
|
|
*/
|
|
static int dump_masked_av_helper(void *k, void *d, void *args)
|
|
{
|
|
struct perm_datum *pdatum = d;
|
|
char **permission_names = args;
|
|
|
|
BUG_ON(pdatum->value < 1 || pdatum->value > 32);
|
|
|
|
permission_names[pdatum->value - 1] = (char *)k;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void security_dump_masked_av(struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
u32 permissions,
|
|
const char *reason)
|
|
{
|
|
struct common_datum *common_dat;
|
|
struct class_datum *tclass_dat;
|
|
struct audit_buffer *ab;
|
|
char *tclass_name;
|
|
char *scontext_name = NULL;
|
|
char *tcontext_name = NULL;
|
|
char *permission_names[32];
|
|
int index;
|
|
u32 length;
|
|
bool need_comma = false;
|
|
|
|
if (!permissions)
|
|
return;
|
|
|
|
tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1);
|
|
tclass_dat = policydb.class_val_to_struct[tclass - 1];
|
|
common_dat = tclass_dat->comdatum;
|
|
|
|
/* init permission_names */
|
|
if (common_dat &&
|
|
hashtab_map(common_dat->permissions.table,
|
|
dump_masked_av_helper, permission_names) < 0)
|
|
goto out;
|
|
|
|
if (hashtab_map(tclass_dat->permissions.table,
|
|
dump_masked_av_helper, permission_names) < 0)
|
|
goto out;
|
|
|
|
/* get scontext/tcontext in text form */
|
|
if (context_struct_to_string(scontext,
|
|
&scontext_name, &length) < 0)
|
|
goto out;
|
|
|
|
if (context_struct_to_string(tcontext,
|
|
&tcontext_name, &length) < 0)
|
|
goto out;
|
|
|
|
/* audit a message */
|
|
ab = audit_log_start(current->audit_context,
|
|
GFP_ATOMIC, AUDIT_SELINUX_ERR);
|
|
if (!ab)
|
|
goto out;
|
|
|
|
audit_log_format(ab, "op=security_compute_av reason=%s "
|
|
"scontext=%s tcontext=%s tclass=%s perms=",
|
|
reason, scontext_name, tcontext_name, tclass_name);
|
|
|
|
for (index = 0; index < 32; index++) {
|
|
u32 mask = (1 << index);
|
|
|
|
if ((mask & permissions) == 0)
|
|
continue;
|
|
|
|
audit_log_format(ab, "%s%s",
|
|
need_comma ? "," : "",
|
|
permission_names[index]
|
|
? permission_names[index] : "????");
|
|
need_comma = true;
|
|
}
|
|
audit_log_end(ab);
|
|
out:
|
|
/* release scontext/tcontext */
|
|
kfree(tcontext_name);
|
|
kfree(scontext_name);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* security_boundary_permission - drops violated permissions
|
|
* on boundary constraint.
|
|
*/
|
|
static void type_attribute_bounds_av(struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
struct av_decision *avd)
|
|
{
|
|
struct context lo_scontext;
|
|
struct context lo_tcontext;
|
|
struct av_decision lo_avd;
|
|
struct type_datum *source;
|
|
struct type_datum *target;
|
|
u32 masked = 0;
|
|
|
|
source = flex_array_get_ptr(policydb.type_val_to_struct_array,
|
|
scontext->type - 1);
|
|
BUG_ON(!source);
|
|
|
|
target = flex_array_get_ptr(policydb.type_val_to_struct_array,
|
|
tcontext->type - 1);
|
|
BUG_ON(!target);
|
|
|
|
if (source->bounds) {
|
|
memset(&lo_avd, 0, sizeof(lo_avd));
|
|
|
|
memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
|
|
lo_scontext.type = source->bounds;
|
|
|
|
context_struct_compute_av(&lo_scontext,
|
|
tcontext,
|
|
tclass,
|
|
&lo_avd);
|
|
if ((lo_avd.allowed & avd->allowed) == avd->allowed)
|
|
return; /* no masked permission */
|
|
masked = ~lo_avd.allowed & avd->allowed;
|
|
}
|
|
|
|
if (target->bounds) {
|
|
memset(&lo_avd, 0, sizeof(lo_avd));
|
|
|
|
memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
|
|
lo_tcontext.type = target->bounds;
|
|
|
|
context_struct_compute_av(scontext,
|
|
&lo_tcontext,
|
|
tclass,
|
|
&lo_avd);
|
|
if ((lo_avd.allowed & avd->allowed) == avd->allowed)
|
|
return; /* no masked permission */
|
|
masked = ~lo_avd.allowed & avd->allowed;
|
|
}
|
|
|
|
if (source->bounds && target->bounds) {
|
|
memset(&lo_avd, 0, sizeof(lo_avd));
|
|
/*
|
|
* lo_scontext and lo_tcontext are already
|
|
* set up.
|
|
*/
|
|
|
|
context_struct_compute_av(&lo_scontext,
|
|
&lo_tcontext,
|
|
tclass,
|
|
&lo_avd);
|
|
if ((lo_avd.allowed & avd->allowed) == avd->allowed)
|
|
return; /* no masked permission */
|
|
masked = ~lo_avd.allowed & avd->allowed;
|
|
}
|
|
|
|
if (masked) {
|
|
/* mask violated permissions */
|
|
avd->allowed &= ~masked;
|
|
|
|
/* audit masked permissions */
|
|
security_dump_masked_av(scontext, tcontext,
|
|
tclass, masked, "bounds");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compute access vectors based on a context structure pair for
|
|
* the permissions in a particular class.
|
|
*/
|
|
static void context_struct_compute_av(struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
struct av_decision *avd)
|
|
{
|
|
struct constraint_node *constraint;
|
|
struct role_allow *ra;
|
|
struct avtab_key avkey;
|
|
struct avtab_node *node;
|
|
struct class_datum *tclass_datum;
|
|
struct ebitmap *sattr, *tattr;
|
|
struct ebitmap_node *snode, *tnode;
|
|
unsigned int i, j;
|
|
|
|
avd->allowed = 0;
|
|
avd->auditallow = 0;
|
|
avd->auditdeny = 0xffffffff;
|
|
|
|
if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass);
|
|
return;
|
|
}
|
|
|
|
tclass_datum = policydb.class_val_to_struct[tclass - 1];
|
|
|
|
/*
|
|
* If a specific type enforcement rule was defined for
|
|
* this permission check, then use it.
|
|
*/
|
|
avkey.target_class = tclass;
|
|
avkey.specified = AVTAB_AV;
|
|
sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1);
|
|
BUG_ON(!sattr);
|
|
tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1);
|
|
BUG_ON(!tattr);
|
|
ebitmap_for_each_positive_bit(sattr, snode, i) {
|
|
ebitmap_for_each_positive_bit(tattr, tnode, j) {
|
|
avkey.source_type = i + 1;
|
|
avkey.target_type = j + 1;
|
|
for (node = avtab_search_node(&policydb.te_avtab, &avkey);
|
|
node;
|
|
node = avtab_search_node_next(node, avkey.specified)) {
|
|
if (node->key.specified == AVTAB_ALLOWED)
|
|
avd->allowed |= node->datum.data;
|
|
else if (node->key.specified == AVTAB_AUDITALLOW)
|
|
avd->auditallow |= node->datum.data;
|
|
else if (node->key.specified == AVTAB_AUDITDENY)
|
|
avd->auditdeny &= node->datum.data;
|
|
}
|
|
|
|
/* Check conditional av table for additional permissions */
|
|
cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
|
|
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove any permissions prohibited by a constraint (this includes
|
|
* the MLS policy).
|
|
*/
|
|
constraint = tclass_datum->constraints;
|
|
while (constraint) {
|
|
if ((constraint->permissions & (avd->allowed)) &&
|
|
!constraint_expr_eval(scontext, tcontext, NULL,
|
|
constraint->expr)) {
|
|
avd->allowed &= ~(constraint->permissions);
|
|
}
|
|
constraint = constraint->next;
|
|
}
|
|
|
|
/*
|
|
* If checking process transition permission and the
|
|
* role is changing, then check the (current_role, new_role)
|
|
* pair.
|
|
*/
|
|
if (tclass == policydb.process_class &&
|
|
(avd->allowed & policydb.process_trans_perms) &&
|
|
scontext->role != tcontext->role) {
|
|
for (ra = policydb.role_allow; ra; ra = ra->next) {
|
|
if (scontext->role == ra->role &&
|
|
tcontext->role == ra->new_role)
|
|
break;
|
|
}
|
|
if (!ra)
|
|
avd->allowed &= ~policydb.process_trans_perms;
|
|
}
|
|
|
|
/*
|
|
* If the given source and target types have boundary
|
|
* constraint, lazy checks have to mask any violated
|
|
* permission and notice it to userspace via audit.
|
|
*/
|
|
type_attribute_bounds_av(scontext, tcontext,
|
|
tclass, avd);
|
|
}
|
|
|
|
static int security_validtrans_handle_fail(struct context *ocontext,
|
|
struct context *ncontext,
|
|
struct context *tcontext,
|
|
u16 tclass)
|
|
{
|
|
char *o = NULL, *n = NULL, *t = NULL;
|
|
u32 olen, nlen, tlen;
|
|
|
|
if (context_struct_to_string(ocontext, &o, &olen))
|
|
goto out;
|
|
if (context_struct_to_string(ncontext, &n, &nlen))
|
|
goto out;
|
|
if (context_struct_to_string(tcontext, &t, &tlen))
|
|
goto out;
|
|
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"security_validate_transition: denied for"
|
|
" oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
|
|
o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
|
|
out:
|
|
kfree(o);
|
|
kfree(n);
|
|
kfree(t);
|
|
|
|
if (!selinux_enforcing)
|
|
return 0;
|
|
return -EPERM;
|
|
}
|
|
|
|
int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
|
|
u16 orig_tclass)
|
|
{
|
|
struct context *ocontext;
|
|
struct context *ncontext;
|
|
struct context *tcontext;
|
|
struct class_datum *tclass_datum;
|
|
struct constraint_node *constraint;
|
|
u16 tclass;
|
|
int rc = 0;
|
|
|
|
if (!ss_initialized)
|
|
return 0;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
tclass = unmap_class(orig_tclass);
|
|
|
|
if (!tclass || tclass > policydb.p_classes.nprim) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized class %d\n",
|
|
__func__, tclass);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
tclass_datum = policydb.class_val_to_struct[tclass - 1];
|
|
|
|
ocontext = sidtab_search(&sidtab, oldsid);
|
|
if (!ocontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, oldsid);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ncontext = sidtab_search(&sidtab, newsid);
|
|
if (!ncontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, newsid);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
tcontext = sidtab_search(&sidtab, tasksid);
|
|
if (!tcontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, tasksid);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
constraint = tclass_datum->validatetrans;
|
|
while (constraint) {
|
|
if (!constraint_expr_eval(ocontext, ncontext, tcontext,
|
|
constraint->expr)) {
|
|
rc = security_validtrans_handle_fail(ocontext, ncontext,
|
|
tcontext, tclass);
|
|
goto out;
|
|
}
|
|
constraint = constraint->next;
|
|
}
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* security_bounded_transition - check whether the given
|
|
* transition is directed to bounded, or not.
|
|
* It returns 0, if @newsid is bounded by @oldsid.
|
|
* Otherwise, it returns error code.
|
|
*
|
|
* @oldsid : current security identifier
|
|
* @newsid : destinated security identifier
|
|
*/
|
|
int security_bounded_transition(u32 old_sid, u32 new_sid)
|
|
{
|
|
struct context *old_context, *new_context;
|
|
struct type_datum *type;
|
|
int index;
|
|
int rc;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -EINVAL;
|
|
old_context = sidtab_search(&sidtab, old_sid);
|
|
if (!old_context) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
|
|
__func__, old_sid);
|
|
goto out;
|
|
}
|
|
|
|
rc = -EINVAL;
|
|
new_context = sidtab_search(&sidtab, new_sid);
|
|
if (!new_context) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
|
|
__func__, new_sid);
|
|
goto out;
|
|
}
|
|
|
|
rc = 0;
|
|
/* type/domain unchanged */
|
|
if (old_context->type == new_context->type)
|
|
goto out;
|
|
|
|
index = new_context->type;
|
|
while (true) {
|
|
type = flex_array_get_ptr(policydb.type_val_to_struct_array,
|
|
index - 1);
|
|
BUG_ON(!type);
|
|
|
|
/* not bounded anymore */
|
|
rc = -EPERM;
|
|
if (!type->bounds)
|
|
break;
|
|
|
|
/* @newsid is bounded by @oldsid */
|
|
rc = 0;
|
|
if (type->bounds == old_context->type)
|
|
break;
|
|
|
|
index = type->bounds;
|
|
}
|
|
|
|
if (rc) {
|
|
char *old_name = NULL;
|
|
char *new_name = NULL;
|
|
u32 length;
|
|
|
|
if (!context_struct_to_string(old_context,
|
|
&old_name, &length) &&
|
|
!context_struct_to_string(new_context,
|
|
&new_name, &length)) {
|
|
audit_log(current->audit_context,
|
|
GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"op=security_bounded_transition "
|
|
"result=denied "
|
|
"oldcontext=%s newcontext=%s",
|
|
old_name, new_name);
|
|
}
|
|
kfree(new_name);
|
|
kfree(old_name);
|
|
}
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void avd_init(struct av_decision *avd)
|
|
{
|
|
avd->allowed = 0;
|
|
avd->auditallow = 0;
|
|
avd->auditdeny = 0xffffffff;
|
|
avd->seqno = latest_granting;
|
|
avd->flags = 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* security_compute_av - Compute access vector decisions.
|
|
* @ssid: source security identifier
|
|
* @tsid: target security identifier
|
|
* @tclass: target security class
|
|
* @avd: access vector decisions
|
|
*
|
|
* Compute a set of access vector decisions based on the
|
|
* SID pair (@ssid, @tsid) for the permissions in @tclass.
|
|
*/
|
|
void security_compute_av(u32 ssid,
|
|
u32 tsid,
|
|
u16 orig_tclass,
|
|
struct av_decision *avd)
|
|
{
|
|
u16 tclass;
|
|
struct context *scontext = NULL, *tcontext = NULL;
|
|
|
|
read_lock(&policy_rwlock);
|
|
avd_init(avd);
|
|
if (!ss_initialized)
|
|
goto allow;
|
|
|
|
scontext = sidtab_search(&sidtab, ssid);
|
|
if (!scontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, ssid);
|
|
goto out;
|
|
}
|
|
|
|
/* permissive domain? */
|
|
if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
|
|
avd->flags |= AVD_FLAGS_PERMISSIVE;
|
|
|
|
tcontext = sidtab_search(&sidtab, tsid);
|
|
if (!tcontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, tsid);
|
|
goto out;
|
|
}
|
|
|
|
tclass = unmap_class(orig_tclass);
|
|
if (unlikely(orig_tclass && !tclass)) {
|
|
if (policydb.allow_unknown)
|
|
goto allow;
|
|
goto out;
|
|
}
|
|
context_struct_compute_av(scontext, tcontext, tclass, avd);
|
|
map_decision(orig_tclass, avd, policydb.allow_unknown);
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return;
|
|
allow:
|
|
avd->allowed = 0xffffffff;
|
|
goto out;
|
|
}
|
|
|
|
void security_compute_av_user(u32 ssid,
|
|
u32 tsid,
|
|
u16 tclass,
|
|
struct av_decision *avd)
|
|
{
|
|
struct context *scontext = NULL, *tcontext = NULL;
|
|
|
|
read_lock(&policy_rwlock);
|
|
avd_init(avd);
|
|
if (!ss_initialized)
|
|
goto allow;
|
|
|
|
scontext = sidtab_search(&sidtab, ssid);
|
|
if (!scontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, ssid);
|
|
goto out;
|
|
}
|
|
|
|
/* permissive domain? */
|
|
if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
|
|
avd->flags |= AVD_FLAGS_PERMISSIVE;
|
|
|
|
tcontext = sidtab_search(&sidtab, tsid);
|
|
if (!tcontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, tsid);
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(!tclass)) {
|
|
if (policydb.allow_unknown)
|
|
goto allow;
|
|
goto out;
|
|
}
|
|
|
|
context_struct_compute_av(scontext, tcontext, tclass, avd);
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return;
|
|
allow:
|
|
avd->allowed = 0xffffffff;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Write the security context string representation of
|
|
* the context structure `context' into a dynamically
|
|
* allocated string of the correct size. Set `*scontext'
|
|
* to point to this string and set `*scontext_len' to
|
|
* the length of the string.
|
|
*/
|
|
static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
|
|
{
|
|
char *scontextp;
|
|
|
|
if (scontext)
|
|
*scontext = NULL;
|
|
*scontext_len = 0;
|
|
|
|
if (context->len) {
|
|
*scontext_len = context->len;
|
|
if (scontext) {
|
|
*scontext = kstrdup(context->str, GFP_ATOMIC);
|
|
if (!(*scontext))
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Compute the size of the context. */
|
|
*scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1;
|
|
*scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1;
|
|
*scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1;
|
|
*scontext_len += mls_compute_context_len(context);
|
|
|
|
if (!scontext)
|
|
return 0;
|
|
|
|
/* Allocate space for the context; caller must free this space. */
|
|
scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
|
|
if (!scontextp)
|
|
return -ENOMEM;
|
|
*scontext = scontextp;
|
|
|
|
/*
|
|
* Copy the user name, role name and type name into the context.
|
|
*/
|
|
sprintf(scontextp, "%s:%s:%s",
|
|
sym_name(&policydb, SYM_USERS, context->user - 1),
|
|
sym_name(&policydb, SYM_ROLES, context->role - 1),
|
|
sym_name(&policydb, SYM_TYPES, context->type - 1));
|
|
scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) +
|
|
1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) +
|
|
1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1));
|
|
|
|
mls_sid_to_context(context, &scontextp);
|
|
|
|
*scontextp = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include "initial_sid_to_string.h"
|
|
|
|
const char *security_get_initial_sid_context(u32 sid)
|
|
{
|
|
if (unlikely(sid > SECINITSID_NUM))
|
|
return NULL;
|
|
return initial_sid_to_string[sid];
|
|
}
|
|
|
|
static int security_sid_to_context_core(u32 sid, char **scontext,
|
|
u32 *scontext_len, int force)
|
|
{
|
|
struct context *context;
|
|
int rc = 0;
|
|
|
|
if (scontext)
|
|
*scontext = NULL;
|
|
*scontext_len = 0;
|
|
|
|
if (!ss_initialized) {
|
|
if (sid <= SECINITSID_NUM) {
|
|
char *scontextp;
|
|
|
|
*scontext_len = strlen(initial_sid_to_string[sid]) + 1;
|
|
if (!scontext)
|
|
goto out;
|
|
scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
|
|
if (!scontextp) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
strcpy(scontextp, initial_sid_to_string[sid]);
|
|
*scontext = scontextp;
|
|
goto out;
|
|
}
|
|
printk(KERN_ERR "SELinux: %s: called before initial "
|
|
"load_policy on unknown SID %d\n", __func__, sid);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
read_lock(&policy_rwlock);
|
|
if (force)
|
|
context = sidtab_search_force(&sidtab, sid);
|
|
else
|
|
context = sidtab_search(&sidtab, sid);
|
|
if (!context) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, sid);
|
|
rc = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
rc = context_struct_to_string(context, scontext, scontext_len);
|
|
out_unlock:
|
|
read_unlock(&policy_rwlock);
|
|
out:
|
|
return rc;
|
|
|
|
}
|
|
|
|
/**
|
|
* security_sid_to_context - Obtain a context for a given SID.
|
|
* @sid: security identifier, SID
|
|
* @scontext: security context
|
|
* @scontext_len: length in bytes
|
|
*
|
|
* Write the string representation of the context associated with @sid
|
|
* into a dynamically allocated string of the correct size. Set @scontext
|
|
* to point to this string and set @scontext_len to the length of the string.
|
|
*/
|
|
int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
|
|
{
|
|
return security_sid_to_context_core(sid, scontext, scontext_len, 0);
|
|
}
|
|
|
|
int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len)
|
|
{
|
|
return security_sid_to_context_core(sid, scontext, scontext_len, 1);
|
|
}
|
|
|
|
/*
|
|
* Caveat: Mutates scontext.
|
|
*/
|
|
static int string_to_context_struct(struct policydb *pol,
|
|
struct sidtab *sidtabp,
|
|
char *scontext,
|
|
u32 scontext_len,
|
|
struct context *ctx,
|
|
u32 def_sid)
|
|
{
|
|
struct role_datum *role;
|
|
struct type_datum *typdatum;
|
|
struct user_datum *usrdatum;
|
|
char *scontextp, *p, oldc;
|
|
int rc = 0;
|
|
|
|
context_init(ctx);
|
|
|
|
/* Parse the security context. */
|
|
|
|
rc = -EINVAL;
|
|
scontextp = (char *) scontext;
|
|
|
|
/* Extract the user. */
|
|
p = scontextp;
|
|
while (*p && *p != ':')
|
|
p++;
|
|
|
|
if (*p == 0)
|
|
goto out;
|
|
|
|
*p++ = 0;
|
|
|
|
usrdatum = hashtab_search(pol->p_users.table, scontextp);
|
|
if (!usrdatum)
|
|
goto out;
|
|
|
|
ctx->user = usrdatum->value;
|
|
|
|
/* Extract role. */
|
|
scontextp = p;
|
|
while (*p && *p != ':')
|
|
p++;
|
|
|
|
if (*p == 0)
|
|
goto out;
|
|
|
|
*p++ = 0;
|
|
|
|
role = hashtab_search(pol->p_roles.table, scontextp);
|
|
if (!role)
|
|
goto out;
|
|
ctx->role = role->value;
|
|
|
|
/* Extract type. */
|
|
scontextp = p;
|
|
while (*p && *p != ':')
|
|
p++;
|
|
oldc = *p;
|
|
*p++ = 0;
|
|
|
|
typdatum = hashtab_search(pol->p_types.table, scontextp);
|
|
if (!typdatum || typdatum->attribute)
|
|
goto out;
|
|
|
|
ctx->type = typdatum->value;
|
|
|
|
rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = -EINVAL;
|
|
if ((p - scontext) < scontext_len)
|
|
goto out;
|
|
|
|
/* Check the validity of the new context. */
|
|
if (!policydb_context_isvalid(pol, ctx))
|
|
goto out;
|
|
rc = 0;
|
|
out:
|
|
if (rc)
|
|
context_destroy(ctx);
|
|
return rc;
|
|
}
|
|
|
|
static int security_context_to_sid_core(const char *scontext, u32 scontext_len,
|
|
u32 *sid, u32 def_sid, gfp_t gfp_flags,
|
|
int force)
|
|
{
|
|
char *scontext2, *str = NULL;
|
|
struct context context;
|
|
int rc = 0;
|
|
|
|
if (!ss_initialized) {
|
|
int i;
|
|
|
|
for (i = 1; i < SECINITSID_NUM; i++) {
|
|
if (!strcmp(initial_sid_to_string[i], scontext)) {
|
|
*sid = i;
|
|
return 0;
|
|
}
|
|
}
|
|
*sid = SECINITSID_KERNEL;
|
|
return 0;
|
|
}
|
|
*sid = SECSID_NULL;
|
|
|
|
/* Copy the string so that we can modify the copy as we parse it. */
|
|
scontext2 = kmalloc(scontext_len + 1, gfp_flags);
|
|
if (!scontext2)
|
|
return -ENOMEM;
|
|
memcpy(scontext2, scontext, scontext_len);
|
|
scontext2[scontext_len] = 0;
|
|
|
|
if (force) {
|
|
/* Save another copy for storing in uninterpreted form */
|
|
rc = -ENOMEM;
|
|
str = kstrdup(scontext2, gfp_flags);
|
|
if (!str)
|
|
goto out;
|
|
}
|
|
|
|
read_lock(&policy_rwlock);
|
|
rc = string_to_context_struct(&policydb, &sidtab, scontext2,
|
|
scontext_len, &context, def_sid);
|
|
if (rc == -EINVAL && force) {
|
|
context.str = str;
|
|
context.len = scontext_len;
|
|
str = NULL;
|
|
} else if (rc)
|
|
goto out_unlock;
|
|
rc = sidtab_context_to_sid(&sidtab, &context, sid);
|
|
context_destroy(&context);
|
|
out_unlock:
|
|
read_unlock(&policy_rwlock);
|
|
out:
|
|
kfree(scontext2);
|
|
kfree(str);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_context_to_sid - Obtain a SID for a given security context.
|
|
* @scontext: security context
|
|
* @scontext_len: length in bytes
|
|
* @sid: security identifier, SID
|
|
*
|
|
* Obtains a SID associated with the security context that
|
|
* has the string representation specified by @scontext.
|
|
* Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
|
|
* memory is available, or 0 on success.
|
|
*/
|
|
int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid)
|
|
{
|
|
return security_context_to_sid_core(scontext, scontext_len,
|
|
sid, SECSID_NULL, GFP_KERNEL, 0);
|
|
}
|
|
|
|
/**
|
|
* security_context_to_sid_default - Obtain a SID for a given security context,
|
|
* falling back to specified default if needed.
|
|
*
|
|
* @scontext: security context
|
|
* @scontext_len: length in bytes
|
|
* @sid: security identifier, SID
|
|
* @def_sid: default SID to assign on error
|
|
*
|
|
* Obtains a SID associated with the security context that
|
|
* has the string representation specified by @scontext.
|
|
* The default SID is passed to the MLS layer to be used to allow
|
|
* kernel labeling of the MLS field if the MLS field is not present
|
|
* (for upgrading to MLS without full relabel).
|
|
* Implicitly forces adding of the context even if it cannot be mapped yet.
|
|
* Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
|
|
* memory is available, or 0 on success.
|
|
*/
|
|
int security_context_to_sid_default(const char *scontext, u32 scontext_len,
|
|
u32 *sid, u32 def_sid, gfp_t gfp_flags)
|
|
{
|
|
return security_context_to_sid_core(scontext, scontext_len,
|
|
sid, def_sid, gfp_flags, 1);
|
|
}
|
|
|
|
int security_context_to_sid_force(const char *scontext, u32 scontext_len,
|
|
u32 *sid)
|
|
{
|
|
return security_context_to_sid_core(scontext, scontext_len,
|
|
sid, SECSID_NULL, GFP_KERNEL, 1);
|
|
}
|
|
|
|
static int compute_sid_handle_invalid_context(
|
|
struct context *scontext,
|
|
struct context *tcontext,
|
|
u16 tclass,
|
|
struct context *newcontext)
|
|
{
|
|
char *s = NULL, *t = NULL, *n = NULL;
|
|
u32 slen, tlen, nlen;
|
|
|
|
if (context_struct_to_string(scontext, &s, &slen))
|
|
goto out;
|
|
if (context_struct_to_string(tcontext, &t, &tlen))
|
|
goto out;
|
|
if (context_struct_to_string(newcontext, &n, &nlen))
|
|
goto out;
|
|
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"security_compute_sid: invalid context %s"
|
|
" for scontext=%s"
|
|
" tcontext=%s"
|
|
" tclass=%s",
|
|
n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
|
|
out:
|
|
kfree(s);
|
|
kfree(t);
|
|
kfree(n);
|
|
if (!selinux_enforcing)
|
|
return 0;
|
|
return -EACCES;
|
|
}
|
|
|
|
static void filename_compute_type(struct policydb *p, struct context *newcontext,
|
|
u32 stype, u32 ttype, u16 tclass,
|
|
const char *objname)
|
|
{
|
|
struct filename_trans ft;
|
|
struct filename_trans_datum *otype;
|
|
|
|
/*
|
|
* Most filename trans rules are going to live in specific directories
|
|
* like /dev or /var/run. This bitmap will quickly skip rule searches
|
|
* if the ttype does not contain any rules.
|
|
*/
|
|
if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype))
|
|
return;
|
|
|
|
ft.stype = stype;
|
|
ft.ttype = ttype;
|
|
ft.tclass = tclass;
|
|
ft.name = objname;
|
|
|
|
otype = hashtab_search(p->filename_trans, &ft);
|
|
if (otype)
|
|
newcontext->type = otype->otype;
|
|
}
|
|
|
|
static int security_compute_sid(u32 ssid,
|
|
u32 tsid,
|
|
u16 orig_tclass,
|
|
u32 specified,
|
|
const char *objname,
|
|
u32 *out_sid,
|
|
bool kern)
|
|
{
|
|
struct class_datum *cladatum = NULL;
|
|
struct context *scontext = NULL, *tcontext = NULL, newcontext;
|
|
struct role_trans *roletr = NULL;
|
|
struct avtab_key avkey;
|
|
struct avtab_datum *avdatum;
|
|
struct avtab_node *node;
|
|
u16 tclass;
|
|
int rc = 0;
|
|
bool sock;
|
|
|
|
if (!ss_initialized) {
|
|
switch (orig_tclass) {
|
|
case SECCLASS_PROCESS: /* kernel value */
|
|
*out_sid = ssid;
|
|
break;
|
|
default:
|
|
*out_sid = tsid;
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
context_init(&newcontext);
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
if (kern) {
|
|
tclass = unmap_class(orig_tclass);
|
|
sock = security_is_socket_class(orig_tclass);
|
|
} else {
|
|
tclass = orig_tclass;
|
|
sock = security_is_socket_class(map_class(tclass));
|
|
}
|
|
|
|
scontext = sidtab_search(&sidtab, ssid);
|
|
if (!scontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, ssid);
|
|
rc = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
tcontext = sidtab_search(&sidtab, tsid);
|
|
if (!tcontext) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, tsid);
|
|
rc = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (tclass && tclass <= policydb.p_classes.nprim)
|
|
cladatum = policydb.class_val_to_struct[tclass - 1];
|
|
|
|
/* Set the user identity. */
|
|
switch (specified) {
|
|
case AVTAB_TRANSITION:
|
|
case AVTAB_CHANGE:
|
|
if (cladatum && cladatum->default_user == DEFAULT_TARGET) {
|
|
newcontext.user = tcontext->user;
|
|
} else {
|
|
/* notice this gets both DEFAULT_SOURCE and unset */
|
|
/* Use the process user identity. */
|
|
newcontext.user = scontext->user;
|
|
}
|
|
break;
|
|
case AVTAB_MEMBER:
|
|
/* Use the related object owner. */
|
|
newcontext.user = tcontext->user;
|
|
break;
|
|
}
|
|
|
|
/* Set the role to default values. */
|
|
if (cladatum && cladatum->default_role == DEFAULT_SOURCE) {
|
|
newcontext.role = scontext->role;
|
|
} else if (cladatum && cladatum->default_role == DEFAULT_TARGET) {
|
|
newcontext.role = tcontext->role;
|
|
} else {
|
|
if ((tclass == policydb.process_class) || (sock == true))
|
|
newcontext.role = scontext->role;
|
|
else
|
|
newcontext.role = OBJECT_R_VAL;
|
|
}
|
|
|
|
/* Set the type to default values. */
|
|
if (cladatum && cladatum->default_type == DEFAULT_SOURCE) {
|
|
newcontext.type = scontext->type;
|
|
} else if (cladatum && cladatum->default_type == DEFAULT_TARGET) {
|
|
newcontext.type = tcontext->type;
|
|
} else {
|
|
if ((tclass == policydb.process_class) || (sock == true)) {
|
|
/* Use the type of process. */
|
|
newcontext.type = scontext->type;
|
|
} else {
|
|
/* Use the type of the related object. */
|
|
newcontext.type = tcontext->type;
|
|
}
|
|
}
|
|
|
|
/* Look for a type transition/member/change rule. */
|
|
avkey.source_type = scontext->type;
|
|
avkey.target_type = tcontext->type;
|
|
avkey.target_class = tclass;
|
|
avkey.specified = specified;
|
|
avdatum = avtab_search(&policydb.te_avtab, &avkey);
|
|
|
|
/* If no permanent rule, also check for enabled conditional rules */
|
|
if (!avdatum) {
|
|
node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
|
|
for (; node; node = avtab_search_node_next(node, specified)) {
|
|
if (node->key.specified & AVTAB_ENABLED) {
|
|
avdatum = &node->datum;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (avdatum) {
|
|
/* Use the type from the type transition/member/change rule. */
|
|
newcontext.type = avdatum->data;
|
|
}
|
|
|
|
/* if we have a objname this is a file trans check so check those rules */
|
|
if (objname)
|
|
filename_compute_type(&policydb, &newcontext, scontext->type,
|
|
tcontext->type, tclass, objname);
|
|
|
|
/* Check for class-specific changes. */
|
|
if (specified & AVTAB_TRANSITION) {
|
|
/* Look for a role transition rule. */
|
|
for (roletr = policydb.role_tr; roletr; roletr = roletr->next) {
|
|
if ((roletr->role == scontext->role) &&
|
|
(roletr->type == tcontext->type) &&
|
|
(roletr->tclass == tclass)) {
|
|
/* Use the role transition rule. */
|
|
newcontext.role = roletr->new_role;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Set the MLS attributes.
|
|
This is done last because it may allocate memory. */
|
|
rc = mls_compute_sid(scontext, tcontext, tclass, specified,
|
|
&newcontext, sock);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
/* Check the validity of the context. */
|
|
if (!policydb_context_isvalid(&policydb, &newcontext)) {
|
|
rc = compute_sid_handle_invalid_context(scontext,
|
|
tcontext,
|
|
tclass,
|
|
&newcontext);
|
|
if (rc)
|
|
goto out_unlock;
|
|
}
|
|
/* Obtain the sid for the context. */
|
|
rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
|
|
out_unlock:
|
|
read_unlock(&policy_rwlock);
|
|
context_destroy(&newcontext);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_transition_sid - Compute the SID for a new subject/object.
|
|
* @ssid: source security identifier
|
|
* @tsid: target security identifier
|
|
* @tclass: target security class
|
|
* @out_sid: security identifier for new subject/object
|
|
*
|
|
* Compute a SID to use for labeling a new subject or object in the
|
|
* class @tclass based on a SID pair (@ssid, @tsid).
|
|
* Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
|
|
* if insufficient memory is available, or %0 if the new SID was
|
|
* computed successfully.
|
|
*/
|
|
int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
|
|
const struct qstr *qstr, u32 *out_sid)
|
|
{
|
|
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
|
|
qstr ? qstr->name : NULL, out_sid, true);
|
|
}
|
|
|
|
int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
|
|
const char *objname, u32 *out_sid)
|
|
{
|
|
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
|
|
objname, out_sid, false);
|
|
}
|
|
|
|
/**
|
|
* security_member_sid - Compute the SID for member selection.
|
|
* @ssid: source security identifier
|
|
* @tsid: target security identifier
|
|
* @tclass: target security class
|
|
* @out_sid: security identifier for selected member
|
|
*
|
|
* Compute a SID to use when selecting a member of a polyinstantiated
|
|
* object of class @tclass based on a SID pair (@ssid, @tsid).
|
|
* Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
|
|
* if insufficient memory is available, or %0 if the SID was
|
|
* computed successfully.
|
|
*/
|
|
int security_member_sid(u32 ssid,
|
|
u32 tsid,
|
|
u16 tclass,
|
|
u32 *out_sid)
|
|
{
|
|
return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL,
|
|
out_sid, false);
|
|
}
|
|
|
|
/**
|
|
* security_change_sid - Compute the SID for object relabeling.
|
|
* @ssid: source security identifier
|
|
* @tsid: target security identifier
|
|
* @tclass: target security class
|
|
* @out_sid: security identifier for selected member
|
|
*
|
|
* Compute a SID to use for relabeling an object of class @tclass
|
|
* based on a SID pair (@ssid, @tsid).
|
|
* Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
|
|
* if insufficient memory is available, or %0 if the SID was
|
|
* computed successfully.
|
|
*/
|
|
int security_change_sid(u32 ssid,
|
|
u32 tsid,
|
|
u16 tclass,
|
|
u32 *out_sid)
|
|
{
|
|
return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL,
|
|
out_sid, false);
|
|
}
|
|
|
|
/* Clone the SID into the new SID table. */
|
|
static int clone_sid(u32 sid,
|
|
struct context *context,
|
|
void *arg)
|
|
{
|
|
struct sidtab *s = arg;
|
|
|
|
if (sid > SECINITSID_NUM)
|
|
return sidtab_insert(s, sid, context);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int convert_context_handle_invalid_context(struct context *context)
|
|
{
|
|
char *s;
|
|
u32 len;
|
|
|
|
if (selinux_enforcing)
|
|
return -EINVAL;
|
|
|
|
if (!context_struct_to_string(context, &s, &len)) {
|
|
printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s);
|
|
kfree(s);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct convert_context_args {
|
|
struct policydb *oldp;
|
|
struct policydb *newp;
|
|
};
|
|
|
|
/*
|
|
* Convert the values in the security context
|
|
* structure `c' from the values specified
|
|
* in the policy `p->oldp' to the values specified
|
|
* in the policy `p->newp'. Verify that the
|
|
* context is valid under the new policy.
|
|
*/
|
|
static int convert_context(u32 key,
|
|
struct context *c,
|
|
void *p)
|
|
{
|
|
struct convert_context_args *args;
|
|
struct context oldc;
|
|
struct ocontext *oc;
|
|
struct mls_range *range;
|
|
struct role_datum *role;
|
|
struct type_datum *typdatum;
|
|
struct user_datum *usrdatum;
|
|
char *s;
|
|
u32 len;
|
|
int rc = 0;
|
|
|
|
if (key <= SECINITSID_NUM)
|
|
goto out;
|
|
|
|
args = p;
|
|
|
|
if (c->str) {
|
|
struct context ctx;
|
|
|
|
rc = -ENOMEM;
|
|
s = kstrdup(c->str, GFP_KERNEL);
|
|
if (!s)
|
|
goto out;
|
|
|
|
rc = string_to_context_struct(args->newp, NULL, s,
|
|
c->len, &ctx, SECSID_NULL);
|
|
kfree(s);
|
|
if (!rc) {
|
|
printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n",
|
|
c->str);
|
|
/* Replace string with mapped representation. */
|
|
kfree(c->str);
|
|
memcpy(c, &ctx, sizeof(*c));
|
|
goto out;
|
|
} else if (rc == -EINVAL) {
|
|
/* Retain string representation for later mapping. */
|
|
rc = 0;
|
|
goto out;
|
|
} else {
|
|
/* Other error condition, e.g. ENOMEM. */
|
|
printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n",
|
|
c->str, -rc);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rc = context_cpy(&oldc, c);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* Convert the user. */
|
|
rc = -EINVAL;
|
|
usrdatum = hashtab_search(args->newp->p_users.table,
|
|
sym_name(args->oldp, SYM_USERS, c->user - 1));
|
|
if (!usrdatum)
|
|
goto bad;
|
|
c->user = usrdatum->value;
|
|
|
|
/* Convert the role. */
|
|
rc = -EINVAL;
|
|
role = hashtab_search(args->newp->p_roles.table,
|
|
sym_name(args->oldp, SYM_ROLES, c->role - 1));
|
|
if (!role)
|
|
goto bad;
|
|
c->role = role->value;
|
|
|
|
/* Convert the type. */
|
|
rc = -EINVAL;
|
|
typdatum = hashtab_search(args->newp->p_types.table,
|
|
sym_name(args->oldp, SYM_TYPES, c->type - 1));
|
|
if (!typdatum)
|
|
goto bad;
|
|
c->type = typdatum->value;
|
|
|
|
/* Convert the MLS fields if dealing with MLS policies */
|
|
if (args->oldp->mls_enabled && args->newp->mls_enabled) {
|
|
rc = mls_convert_context(args->oldp, args->newp, c);
|
|
if (rc)
|
|
goto bad;
|
|
} else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
|
|
/*
|
|
* Switching between MLS and non-MLS policy:
|
|
* free any storage used by the MLS fields in the
|
|
* context for all existing entries in the sidtab.
|
|
*/
|
|
mls_context_destroy(c);
|
|
} else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
|
|
/*
|
|
* Switching between non-MLS and MLS policy:
|
|
* ensure that the MLS fields of the context for all
|
|
* existing entries in the sidtab are filled in with a
|
|
* suitable default value, likely taken from one of the
|
|
* initial SIDs.
|
|
*/
|
|
oc = args->newp->ocontexts[OCON_ISID];
|
|
while (oc && oc->sid[0] != SECINITSID_UNLABELED)
|
|
oc = oc->next;
|
|
rc = -EINVAL;
|
|
if (!oc) {
|
|
printk(KERN_ERR "SELinux: unable to look up"
|
|
" the initial SIDs list\n");
|
|
goto bad;
|
|
}
|
|
range = &oc->context[0].range;
|
|
rc = mls_range_set(c, range);
|
|
if (rc)
|
|
goto bad;
|
|
}
|
|
|
|
/* Check the validity of the new context. */
|
|
if (!policydb_context_isvalid(args->newp, c)) {
|
|
rc = convert_context_handle_invalid_context(&oldc);
|
|
if (rc)
|
|
goto bad;
|
|
}
|
|
|
|
context_destroy(&oldc);
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
bad:
|
|
/* Map old representation to string and save it. */
|
|
rc = context_struct_to_string(&oldc, &s, &len);
|
|
if (rc)
|
|
return rc;
|
|
context_destroy(&oldc);
|
|
context_destroy(c);
|
|
c->str = s;
|
|
c->len = len;
|
|
printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n",
|
|
c->str);
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
static void security_load_policycaps(void)
|
|
{
|
|
selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
|
|
POLICYDB_CAPABILITY_NETPEER);
|
|
selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
|
|
POLICYDB_CAPABILITY_OPENPERM);
|
|
selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps,
|
|
POLICYDB_CAPABILITY_ALWAYSNETWORK);
|
|
}
|
|
|
|
static int security_preserve_bools(struct policydb *p);
|
|
|
|
/**
|
|
* security_load_policy - Load a security policy configuration.
|
|
* @data: binary policy data
|
|
* @len: length of data in bytes
|
|
*
|
|
* Load a new set of security policy configuration data,
|
|
* validate it and convert the SID table as necessary.
|
|
* This function will flush the access vector cache after
|
|
* loading the new policy.
|
|
*/
|
|
int security_load_policy(void *data, size_t len)
|
|
{
|
|
struct policydb oldpolicydb, newpolicydb;
|
|
struct sidtab oldsidtab, newsidtab;
|
|
struct selinux_mapping *oldmap, *map = NULL;
|
|
struct convert_context_args args;
|
|
u32 seqno;
|
|
u16 map_size;
|
|
int rc = 0;
|
|
struct policy_file file = { data, len }, *fp = &file;
|
|
|
|
if (!ss_initialized) {
|
|
avtab_cache_init();
|
|
rc = policydb_read(&policydb, fp);
|
|
if (rc) {
|
|
avtab_cache_destroy();
|
|
return rc;
|
|
}
|
|
|
|
policydb.len = len;
|
|
rc = selinux_set_mapping(&policydb, secclass_map,
|
|
¤t_mapping,
|
|
¤t_mapping_size);
|
|
if (rc) {
|
|
policydb_destroy(&policydb);
|
|
avtab_cache_destroy();
|
|
return rc;
|
|
}
|
|
|
|
rc = policydb_load_isids(&policydb, &sidtab);
|
|
if (rc) {
|
|
policydb_destroy(&policydb);
|
|
avtab_cache_destroy();
|
|
return rc;
|
|
}
|
|
|
|
security_load_policycaps();
|
|
ss_initialized = 1;
|
|
seqno = ++latest_granting;
|
|
selinux_complete_init();
|
|
avc_ss_reset(seqno);
|
|
selnl_notify_policyload(seqno);
|
|
selinux_status_update_policyload(seqno);
|
|
selinux_netlbl_cache_invalidate();
|
|
selinux_xfrm_notify_policyload();
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
sidtab_hash_eval(&sidtab, "sids");
|
|
#endif
|
|
|
|
rc = policydb_read(&newpolicydb, fp);
|
|
if (rc)
|
|
return rc;
|
|
|
|
newpolicydb.len = len;
|
|
/* If switching between different policy types, log MLS status */
|
|
if (policydb.mls_enabled && !newpolicydb.mls_enabled)
|
|
printk(KERN_INFO "SELinux: Disabling MLS support...\n");
|
|
else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
|
|
printk(KERN_INFO "SELinux: Enabling MLS support...\n");
|
|
|
|
rc = policydb_load_isids(&newpolicydb, &newsidtab);
|
|
if (rc) {
|
|
printk(KERN_ERR "SELinux: unable to load the initial SIDs\n");
|
|
policydb_destroy(&newpolicydb);
|
|
return rc;
|
|
}
|
|
|
|
rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = security_preserve_bools(&newpolicydb);
|
|
if (rc) {
|
|
printk(KERN_ERR "SELinux: unable to preserve booleans\n");
|
|
goto err;
|
|
}
|
|
|
|
/* Clone the SID table. */
|
|
sidtab_shutdown(&sidtab);
|
|
|
|
rc = sidtab_map(&sidtab, clone_sid, &newsidtab);
|
|
if (rc)
|
|
goto err;
|
|
|
|
/*
|
|
* Convert the internal representations of contexts
|
|
* in the new SID table.
|
|
*/
|
|
args.oldp = &policydb;
|
|
args.newp = &newpolicydb;
|
|
rc = sidtab_map(&newsidtab, convert_context, &args);
|
|
if (rc) {
|
|
printk(KERN_ERR "SELinux: unable to convert the internal"
|
|
" representation of contexts in the new SID"
|
|
" table\n");
|
|
goto err;
|
|
}
|
|
|
|
/* Save the old policydb and SID table to free later. */
|
|
memcpy(&oldpolicydb, &policydb, sizeof policydb);
|
|
sidtab_set(&oldsidtab, &sidtab);
|
|
|
|
/* Install the new policydb and SID table. */
|
|
write_lock_irq(&policy_rwlock);
|
|
memcpy(&policydb, &newpolicydb, sizeof policydb);
|
|
sidtab_set(&sidtab, &newsidtab);
|
|
security_load_policycaps();
|
|
oldmap = current_mapping;
|
|
current_mapping = map;
|
|
current_mapping_size = map_size;
|
|
seqno = ++latest_granting;
|
|
write_unlock_irq(&policy_rwlock);
|
|
|
|
/* Free the old policydb and SID table. */
|
|
policydb_destroy(&oldpolicydb);
|
|
sidtab_destroy(&oldsidtab);
|
|
kfree(oldmap);
|
|
|
|
avc_ss_reset(seqno);
|
|
selnl_notify_policyload(seqno);
|
|
selinux_status_update_policyload(seqno);
|
|
selinux_netlbl_cache_invalidate();
|
|
selinux_xfrm_notify_policyload();
|
|
|
|
return 0;
|
|
|
|
err:
|
|
kfree(map);
|
|
sidtab_destroy(&newsidtab);
|
|
policydb_destroy(&newpolicydb);
|
|
return rc;
|
|
|
|
}
|
|
|
|
size_t security_policydb_len(void)
|
|
{
|
|
size_t len;
|
|
|
|
read_lock(&policy_rwlock);
|
|
len = policydb.len;
|
|
read_unlock(&policy_rwlock);
|
|
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* security_port_sid - Obtain the SID for a port.
|
|
* @protocol: protocol number
|
|
* @port: port number
|
|
* @out_sid: security identifier
|
|
*/
|
|
int security_port_sid(u8 protocol, u16 port, u32 *out_sid)
|
|
{
|
|
struct ocontext *c;
|
|
int rc = 0;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
c = policydb.ocontexts[OCON_PORT];
|
|
while (c) {
|
|
if (c->u.port.protocol == protocol &&
|
|
c->u.port.low_port <= port &&
|
|
c->u.port.high_port >= port)
|
|
break;
|
|
c = c->next;
|
|
}
|
|
|
|
if (c) {
|
|
if (!c->sid[0]) {
|
|
rc = sidtab_context_to_sid(&sidtab,
|
|
&c->context[0],
|
|
&c->sid[0]);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
*out_sid = c->sid[0];
|
|
} else {
|
|
*out_sid = SECINITSID_PORT;
|
|
}
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_netif_sid - Obtain the SID for a network interface.
|
|
* @name: interface name
|
|
* @if_sid: interface SID
|
|
*/
|
|
int security_netif_sid(char *name, u32 *if_sid)
|
|
{
|
|
int rc = 0;
|
|
struct ocontext *c;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
c = policydb.ocontexts[OCON_NETIF];
|
|
while (c) {
|
|
if (strcmp(name, c->u.name) == 0)
|
|
break;
|
|
c = c->next;
|
|
}
|
|
|
|
if (c) {
|
|
if (!c->sid[0] || !c->sid[1]) {
|
|
rc = sidtab_context_to_sid(&sidtab,
|
|
&c->context[0],
|
|
&c->sid[0]);
|
|
if (rc)
|
|
goto out;
|
|
rc = sidtab_context_to_sid(&sidtab,
|
|
&c->context[1],
|
|
&c->sid[1]);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
*if_sid = c->sid[0];
|
|
} else
|
|
*if_sid = SECINITSID_NETIF;
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
|
|
{
|
|
int i, fail = 0;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
if (addr[i] != (input[i] & mask[i])) {
|
|
fail = 1;
|
|
break;
|
|
}
|
|
|
|
return !fail;
|
|
}
|
|
|
|
/**
|
|
* security_node_sid - Obtain the SID for a node (host).
|
|
* @domain: communication domain aka address family
|
|
* @addrp: address
|
|
* @addrlen: address length in bytes
|
|
* @out_sid: security identifier
|
|
*/
|
|
int security_node_sid(u16 domain,
|
|
void *addrp,
|
|
u32 addrlen,
|
|
u32 *out_sid)
|
|
{
|
|
int rc;
|
|
struct ocontext *c;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
switch (domain) {
|
|
case AF_INET: {
|
|
u32 addr;
|
|
|
|
rc = -EINVAL;
|
|
if (addrlen != sizeof(u32))
|
|
goto out;
|
|
|
|
addr = *((u32 *)addrp);
|
|
|
|
c = policydb.ocontexts[OCON_NODE];
|
|
while (c) {
|
|
if (c->u.node.addr == (addr & c->u.node.mask))
|
|
break;
|
|
c = c->next;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case AF_INET6:
|
|
rc = -EINVAL;
|
|
if (addrlen != sizeof(u64) * 2)
|
|
goto out;
|
|
c = policydb.ocontexts[OCON_NODE6];
|
|
while (c) {
|
|
if (match_ipv6_addrmask(addrp, c->u.node6.addr,
|
|
c->u.node6.mask))
|
|
break;
|
|
c = c->next;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
rc = 0;
|
|
*out_sid = SECINITSID_NODE;
|
|
goto out;
|
|
}
|
|
|
|
if (c) {
|
|
if (!c->sid[0]) {
|
|
rc = sidtab_context_to_sid(&sidtab,
|
|
&c->context[0],
|
|
&c->sid[0]);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
*out_sid = c->sid[0];
|
|
} else {
|
|
*out_sid = SECINITSID_NODE;
|
|
}
|
|
|
|
rc = 0;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
#define SIDS_NEL 25
|
|
|
|
/**
|
|
* security_get_user_sids - Obtain reachable SIDs for a user.
|
|
* @fromsid: starting SID
|
|
* @username: username
|
|
* @sids: array of reachable SIDs for user
|
|
* @nel: number of elements in @sids
|
|
*
|
|
* Generate the set of SIDs for legal security contexts
|
|
* for a given user that can be reached by @fromsid.
|
|
* Set *@sids to point to a dynamically allocated
|
|
* array containing the set of SIDs. Set *@nel to the
|
|
* number of elements in the array.
|
|
*/
|
|
|
|
int security_get_user_sids(u32 fromsid,
|
|
char *username,
|
|
u32 **sids,
|
|
u32 *nel)
|
|
{
|
|
struct context *fromcon, usercon;
|
|
u32 *mysids = NULL, *mysids2, sid;
|
|
u32 mynel = 0, maxnel = SIDS_NEL;
|
|
struct user_datum *user;
|
|
struct role_datum *role;
|
|
struct ebitmap_node *rnode, *tnode;
|
|
int rc = 0, i, j;
|
|
|
|
*sids = NULL;
|
|
*nel = 0;
|
|
|
|
if (!ss_initialized)
|
|
goto out;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
context_init(&usercon);
|
|
|
|
rc = -EINVAL;
|
|
fromcon = sidtab_search(&sidtab, fromsid);
|
|
if (!fromcon)
|
|
goto out_unlock;
|
|
|
|
rc = -EINVAL;
|
|
user = hashtab_search(policydb.p_users.table, username);
|
|
if (!user)
|
|
goto out_unlock;
|
|
|
|
usercon.user = user->value;
|
|
|
|
rc = -ENOMEM;
|
|
mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
|
|
if (!mysids)
|
|
goto out_unlock;
|
|
|
|
ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
|
|
role = policydb.role_val_to_struct[i];
|
|
usercon.role = i + 1;
|
|
ebitmap_for_each_positive_bit(&role->types, tnode, j) {
|
|
usercon.type = j + 1;
|
|
|
|
if (mls_setup_user_range(fromcon, user, &usercon))
|
|
continue;
|
|
|
|
rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
|
|
if (rc)
|
|
goto out_unlock;
|
|
if (mynel < maxnel) {
|
|
mysids[mynel++] = sid;
|
|
} else {
|
|
rc = -ENOMEM;
|
|
maxnel += SIDS_NEL;
|
|
mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
|
|
if (!mysids2)
|
|
goto out_unlock;
|
|
memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
|
|
kfree(mysids);
|
|
mysids = mysids2;
|
|
mysids[mynel++] = sid;
|
|
}
|
|
}
|
|
}
|
|
rc = 0;
|
|
out_unlock:
|
|
read_unlock(&policy_rwlock);
|
|
if (rc || !mynel) {
|
|
kfree(mysids);
|
|
goto out;
|
|
}
|
|
|
|
rc = -ENOMEM;
|
|
mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
|
|
if (!mysids2) {
|
|
kfree(mysids);
|
|
goto out;
|
|
}
|
|
for (i = 0, j = 0; i < mynel; i++) {
|
|
struct av_decision dummy_avd;
|
|
rc = avc_has_perm_noaudit(fromsid, mysids[i],
|
|
SECCLASS_PROCESS, /* kernel value */
|
|
PROCESS__TRANSITION, AVC_STRICT,
|
|
&dummy_avd);
|
|
if (!rc)
|
|
mysids2[j++] = mysids[i];
|
|
cond_resched();
|
|
}
|
|
rc = 0;
|
|
kfree(mysids);
|
|
*sids = mysids2;
|
|
*nel = j;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_genfs_sid - Obtain a SID for a file in a filesystem
|
|
* @fstype: filesystem type
|
|
* @path: path from root of mount
|
|
* @sclass: file security class
|
|
* @sid: SID for path
|
|
*
|
|
* Obtain a SID to use for a file in a filesystem that
|
|
* cannot support xattr or use a fixed labeling behavior like
|
|
* transition SIDs or task SIDs.
|
|
*/
|
|
int security_genfs_sid(const char *fstype,
|
|
char *path,
|
|
u16 orig_sclass,
|
|
u32 *sid)
|
|
{
|
|
int len;
|
|
u16 sclass;
|
|
struct genfs *genfs;
|
|
struct ocontext *c;
|
|
int rc, cmp = 0;
|
|
|
|
while (path[0] == '/' && path[1] == '/')
|
|
path++;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
sclass = unmap_class(orig_sclass);
|
|
*sid = SECINITSID_UNLABELED;
|
|
|
|
for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
|
|
cmp = strcmp(fstype, genfs->fstype);
|
|
if (cmp <= 0)
|
|
break;
|
|
}
|
|
|
|
rc = -ENOENT;
|
|
if (!genfs || cmp)
|
|
goto out;
|
|
|
|
for (c = genfs->head; c; c = c->next) {
|
|
len = strlen(c->u.name);
|
|
if ((!c->v.sclass || sclass == c->v.sclass) &&
|
|
(strncmp(c->u.name, path, len) == 0))
|
|
break;
|
|
}
|
|
|
|
rc = -ENOENT;
|
|
if (!c)
|
|
goto out;
|
|
|
|
if (!c->sid[0]) {
|
|
rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
*sid = c->sid[0];
|
|
rc = 0;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_fs_use - Determine how to handle labeling for a filesystem.
|
|
* @sb: superblock in question
|
|
*/
|
|
int security_fs_use(struct super_block *sb)
|
|
{
|
|
int rc = 0;
|
|
struct ocontext *c;
|
|
struct superblock_security_struct *sbsec = sb->s_security;
|
|
const char *fstype = sb->s_type->name;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
c = policydb.ocontexts[OCON_FSUSE];
|
|
while (c) {
|
|
if (strcmp(fstype, c->u.name) == 0)
|
|
break;
|
|
c = c->next;
|
|
}
|
|
|
|
if (c) {
|
|
sbsec->behavior = c->v.behavior;
|
|
if (!c->sid[0]) {
|
|
rc = sidtab_context_to_sid(&sidtab, &c->context[0],
|
|
&c->sid[0]);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
sbsec->sid = c->sid[0];
|
|
} else {
|
|
rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, &sbsec->sid);
|
|
if (rc) {
|
|
sbsec->behavior = SECURITY_FS_USE_NONE;
|
|
rc = 0;
|
|
} else {
|
|
sbsec->behavior = SECURITY_FS_USE_GENFS;
|
|
}
|
|
}
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
int security_get_bools(int *len, char ***names, int **values)
|
|
{
|
|
int i, rc;
|
|
|
|
read_lock(&policy_rwlock);
|
|
*names = NULL;
|
|
*values = NULL;
|
|
|
|
rc = 0;
|
|
*len = policydb.p_bools.nprim;
|
|
if (!*len)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
*names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
|
|
if (!*names)
|
|
goto err;
|
|
|
|
rc = -ENOMEM;
|
|
*values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
|
|
if (!*values)
|
|
goto err;
|
|
|
|
for (i = 0; i < *len; i++) {
|
|
size_t name_len;
|
|
|
|
(*values)[i] = policydb.bool_val_to_struct[i]->state;
|
|
name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1;
|
|
|
|
rc = -ENOMEM;
|
|
(*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
|
|
if (!(*names)[i])
|
|
goto err;
|
|
|
|
strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len);
|
|
(*names)[i][name_len - 1] = 0;
|
|
}
|
|
rc = 0;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
err:
|
|
if (*names) {
|
|
for (i = 0; i < *len; i++)
|
|
kfree((*names)[i]);
|
|
}
|
|
kfree(*values);
|
|
goto out;
|
|
}
|
|
|
|
|
|
int security_set_bools(int len, int *values)
|
|
{
|
|
int i, rc;
|
|
int lenp, seqno = 0;
|
|
struct cond_node *cur;
|
|
|
|
write_lock_irq(&policy_rwlock);
|
|
|
|
rc = -EFAULT;
|
|
lenp = policydb.p_bools.nprim;
|
|
if (len != lenp)
|
|
goto out;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
|
|
audit_log(current->audit_context, GFP_ATOMIC,
|
|
AUDIT_MAC_CONFIG_CHANGE,
|
|
"bool=%s val=%d old_val=%d auid=%u ses=%u",
|
|
sym_name(&policydb, SYM_BOOLS, i),
|
|
!!values[i],
|
|
policydb.bool_val_to_struct[i]->state,
|
|
from_kuid(&init_user_ns, audit_get_loginuid(current)),
|
|
audit_get_sessionid(current));
|
|
}
|
|
if (values[i])
|
|
policydb.bool_val_to_struct[i]->state = 1;
|
|
else
|
|
policydb.bool_val_to_struct[i]->state = 0;
|
|
}
|
|
|
|
for (cur = policydb.cond_list; cur; cur = cur->next) {
|
|
rc = evaluate_cond_node(&policydb, cur);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
seqno = ++latest_granting;
|
|
rc = 0;
|
|
out:
|
|
write_unlock_irq(&policy_rwlock);
|
|
if (!rc) {
|
|
avc_ss_reset(seqno);
|
|
selnl_notify_policyload(seqno);
|
|
selinux_status_update_policyload(seqno);
|
|
selinux_xfrm_notify_policyload();
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int security_get_bool_value(int bool)
|
|
{
|
|
int rc;
|
|
int len;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -EFAULT;
|
|
len = policydb.p_bools.nprim;
|
|
if (bool >= len)
|
|
goto out;
|
|
|
|
rc = policydb.bool_val_to_struct[bool]->state;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
static int security_preserve_bools(struct policydb *p)
|
|
{
|
|
int rc, nbools = 0, *bvalues = NULL, i;
|
|
char **bnames = NULL;
|
|
struct cond_bool_datum *booldatum;
|
|
struct cond_node *cur;
|
|
|
|
rc = security_get_bools(&nbools, &bnames, &bvalues);
|
|
if (rc)
|
|
goto out;
|
|
for (i = 0; i < nbools; i++) {
|
|
booldatum = hashtab_search(p->p_bools.table, bnames[i]);
|
|
if (booldatum)
|
|
booldatum->state = bvalues[i];
|
|
}
|
|
for (cur = p->cond_list; cur; cur = cur->next) {
|
|
rc = evaluate_cond_node(p, cur);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (bnames) {
|
|
for (i = 0; i < nbools; i++)
|
|
kfree(bnames[i]);
|
|
}
|
|
kfree(bnames);
|
|
kfree(bvalues);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* security_sid_mls_copy() - computes a new sid based on the given
|
|
* sid and the mls portion of mls_sid.
|
|
*/
|
|
int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
|
|
{
|
|
struct context *context1;
|
|
struct context *context2;
|
|
struct context newcon;
|
|
char *s;
|
|
u32 len;
|
|
int rc;
|
|
|
|
rc = 0;
|
|
if (!ss_initialized || !policydb.mls_enabled) {
|
|
*new_sid = sid;
|
|
goto out;
|
|
}
|
|
|
|
context_init(&newcon);
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -EINVAL;
|
|
context1 = sidtab_search(&sidtab, sid);
|
|
if (!context1) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, sid);
|
|
goto out_unlock;
|
|
}
|
|
|
|
rc = -EINVAL;
|
|
context2 = sidtab_search(&sidtab, mls_sid);
|
|
if (!context2) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, mls_sid);
|
|
goto out_unlock;
|
|
}
|
|
|
|
newcon.user = context1->user;
|
|
newcon.role = context1->role;
|
|
newcon.type = context1->type;
|
|
rc = mls_context_cpy(&newcon, context2);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
/* Check the validity of the new context. */
|
|
if (!policydb_context_isvalid(&policydb, &newcon)) {
|
|
rc = convert_context_handle_invalid_context(&newcon);
|
|
if (rc) {
|
|
if (!context_struct_to_string(&newcon, &s, &len)) {
|
|
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"security_sid_mls_copy: invalid context %s", s);
|
|
kfree(s);
|
|
}
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
|
|
out_unlock:
|
|
read_unlock(&policy_rwlock);
|
|
context_destroy(&newcon);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_net_peersid_resolve - Compare and resolve two network peer SIDs
|
|
* @nlbl_sid: NetLabel SID
|
|
* @nlbl_type: NetLabel labeling protocol type
|
|
* @xfrm_sid: XFRM SID
|
|
*
|
|
* Description:
|
|
* Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
|
|
* resolved into a single SID it is returned via @peer_sid and the function
|
|
* returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
|
|
* returns a negative value. A table summarizing the behavior is below:
|
|
*
|
|
* | function return | @sid
|
|
* ------------------------------+-----------------+-----------------
|
|
* no peer labels | 0 | SECSID_NULL
|
|
* single peer label | 0 | <peer_label>
|
|
* multiple, consistent labels | 0 | <peer_label>
|
|
* multiple, inconsistent labels | -<errno> | SECSID_NULL
|
|
*
|
|
*/
|
|
int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
|
|
u32 xfrm_sid,
|
|
u32 *peer_sid)
|
|
{
|
|
int rc;
|
|
struct context *nlbl_ctx;
|
|
struct context *xfrm_ctx;
|
|
|
|
*peer_sid = SECSID_NULL;
|
|
|
|
/* handle the common (which also happens to be the set of easy) cases
|
|
* right away, these two if statements catch everything involving a
|
|
* single or absent peer SID/label */
|
|
if (xfrm_sid == SECSID_NULL) {
|
|
*peer_sid = nlbl_sid;
|
|
return 0;
|
|
}
|
|
/* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
|
|
* and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
|
|
* is present */
|
|
if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
|
|
*peer_sid = xfrm_sid;
|
|
return 0;
|
|
}
|
|
|
|
/* we don't need to check ss_initialized here since the only way both
|
|
* nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
|
|
* security server was initialized and ss_initialized was true */
|
|
if (!policydb.mls_enabled)
|
|
return 0;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -EINVAL;
|
|
nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
|
|
if (!nlbl_ctx) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, nlbl_sid);
|
|
goto out;
|
|
}
|
|
rc = -EINVAL;
|
|
xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
|
|
if (!xfrm_ctx) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n",
|
|
__func__, xfrm_sid);
|
|
goto out;
|
|
}
|
|
rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* at present NetLabel SIDs/labels really only carry MLS
|
|
* information so if the MLS portion of the NetLabel SID
|
|
* matches the MLS portion of the labeled XFRM SID/label
|
|
* then pass along the XFRM SID as it is the most
|
|
* expressive */
|
|
*peer_sid = xfrm_sid;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
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;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -ENOMEM;
|
|
*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) {
|
|
int i;
|
|
for (i = 0; i < *nclasses; i++)
|
|
kfree((*classes)[i]);
|
|
kfree(*classes);
|
|
}
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
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, i;
|
|
struct class_datum *match;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -EINVAL;
|
|
match = hashtab_search(policydb.p_classes.table, class);
|
|
if (!match) {
|
|
printk(KERN_ERR "SELinux: %s: unrecognized class %s\n",
|
|
__func__, class);
|
|
goto out;
|
|
}
|
|
|
|
rc = -ENOMEM;
|
|
*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)
|
|
goto err;
|
|
}
|
|
|
|
rc = hashtab_map(match->permissions.table, get_permissions_callback,
|
|
*perms);
|
|
if (rc)
|
|
goto err;
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
|
|
err:
|
|
read_unlock(&policy_rwlock);
|
|
for (i = 0; i < *nperms; i++)
|
|
kfree((*perms)[i]);
|
|
kfree(*perms);
|
|
return rc;
|
|
}
|
|
|
|
int security_get_reject_unknown(void)
|
|
{
|
|
return policydb.reject_unknown;
|
|
}
|
|
|
|
int security_get_allow_unknown(void)
|
|
{
|
|
return policydb.allow_unknown;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
read_lock(&policy_rwlock);
|
|
rc = ebitmap_get_bit(&policydb.policycaps, req_cap);
|
|
read_unlock(&policy_rwlock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
struct selinux_audit_rule {
|
|
u32 au_seqno;
|
|
struct context au_ctxt;
|
|
};
|
|
|
|
void selinux_audit_rule_free(void *vrule)
|
|
{
|
|
struct selinux_audit_rule *rule = vrule;
|
|
|
|
if (rule) {
|
|
context_destroy(&rule->au_ctxt);
|
|
kfree(rule);
|
|
}
|
|
}
|
|
|
|
int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
|
|
{
|
|
struct selinux_audit_rule *tmprule;
|
|
struct role_datum *roledatum;
|
|
struct type_datum *typedatum;
|
|
struct user_datum *userdatum;
|
|
struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule;
|
|
int rc = 0;
|
|
|
|
*rule = NULL;
|
|
|
|
if (!ss_initialized)
|
|
return -EOPNOTSUPP;
|
|
|
|
switch (field) {
|
|
case AUDIT_SUBJ_USER:
|
|
case AUDIT_SUBJ_ROLE:
|
|
case AUDIT_SUBJ_TYPE:
|
|
case AUDIT_OBJ_USER:
|
|
case AUDIT_OBJ_ROLE:
|
|
case AUDIT_OBJ_TYPE:
|
|
/* only 'equals' and 'not equals' fit user, role, and type */
|
|
if (op != Audit_equal && op != Audit_not_equal)
|
|
return -EINVAL;
|
|
break;
|
|
case AUDIT_SUBJ_SEN:
|
|
case AUDIT_SUBJ_CLR:
|
|
case AUDIT_OBJ_LEV_LOW:
|
|
case AUDIT_OBJ_LEV_HIGH:
|
|
/* we do not allow a range, indicated by the presence of '-' */
|
|
if (strchr(rulestr, '-'))
|
|
return -EINVAL;
|
|
break;
|
|
default:
|
|
/* only the above fields are valid */
|
|
return -EINVAL;
|
|
}
|
|
|
|
tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
|
|
if (!tmprule)
|
|
return -ENOMEM;
|
|
|
|
context_init(&tmprule->au_ctxt);
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
tmprule->au_seqno = latest_granting;
|
|
|
|
switch (field) {
|
|
case AUDIT_SUBJ_USER:
|
|
case AUDIT_OBJ_USER:
|
|
rc = -EINVAL;
|
|
userdatum = hashtab_search(policydb.p_users.table, rulestr);
|
|
if (!userdatum)
|
|
goto out;
|
|
tmprule->au_ctxt.user = userdatum->value;
|
|
break;
|
|
case AUDIT_SUBJ_ROLE:
|
|
case AUDIT_OBJ_ROLE:
|
|
rc = -EINVAL;
|
|
roledatum = hashtab_search(policydb.p_roles.table, rulestr);
|
|
if (!roledatum)
|
|
goto out;
|
|
tmprule->au_ctxt.role = roledatum->value;
|
|
break;
|
|
case AUDIT_SUBJ_TYPE:
|
|
case AUDIT_OBJ_TYPE:
|
|
rc = -EINVAL;
|
|
typedatum = hashtab_search(policydb.p_types.table, rulestr);
|
|
if (!typedatum)
|
|
goto out;
|
|
tmprule->au_ctxt.type = typedatum->value;
|
|
break;
|
|
case AUDIT_SUBJ_SEN:
|
|
case AUDIT_SUBJ_CLR:
|
|
case AUDIT_OBJ_LEV_LOW:
|
|
case AUDIT_OBJ_LEV_HIGH:
|
|
rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
|
|
if (rc)
|
|
goto out;
|
|
break;
|
|
}
|
|
rc = 0;
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
|
|
if (rc) {
|
|
selinux_audit_rule_free(tmprule);
|
|
tmprule = NULL;
|
|
}
|
|
|
|
*rule = tmprule;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Check to see if the rule contains any selinux fields */
|
|
int selinux_audit_rule_known(struct audit_krule *rule)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < rule->field_count; i++) {
|
|
struct audit_field *f = &rule->fields[i];
|
|
switch (f->type) {
|
|
case AUDIT_SUBJ_USER:
|
|
case AUDIT_SUBJ_ROLE:
|
|
case AUDIT_SUBJ_TYPE:
|
|
case AUDIT_SUBJ_SEN:
|
|
case AUDIT_SUBJ_CLR:
|
|
case AUDIT_OBJ_USER:
|
|
case AUDIT_OBJ_ROLE:
|
|
case AUDIT_OBJ_TYPE:
|
|
case AUDIT_OBJ_LEV_LOW:
|
|
case AUDIT_OBJ_LEV_HIGH:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
|
|
struct audit_context *actx)
|
|
{
|
|
struct context *ctxt;
|
|
struct mls_level *level;
|
|
struct selinux_audit_rule *rule = vrule;
|
|
int match = 0;
|
|
|
|
if (!rule) {
|
|
audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"selinux_audit_rule_match: missing rule\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
if (rule->au_seqno < latest_granting) {
|
|
audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"selinux_audit_rule_match: stale rule\n");
|
|
match = -ESTALE;
|
|
goto out;
|
|
}
|
|
|
|
ctxt = sidtab_search(&sidtab, sid);
|
|
if (!ctxt) {
|
|
audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
|
|
"selinux_audit_rule_match: unrecognized SID %d\n",
|
|
sid);
|
|
match = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/* a field/op pair that is not caught here will simply fall through
|
|
without a match */
|
|
switch (field) {
|
|
case AUDIT_SUBJ_USER:
|
|
case AUDIT_OBJ_USER:
|
|
switch (op) {
|
|
case Audit_equal:
|
|
match = (ctxt->user == rule->au_ctxt.user);
|
|
break;
|
|
case Audit_not_equal:
|
|
match = (ctxt->user != rule->au_ctxt.user);
|
|
break;
|
|
}
|
|
break;
|
|
case AUDIT_SUBJ_ROLE:
|
|
case AUDIT_OBJ_ROLE:
|
|
switch (op) {
|
|
case Audit_equal:
|
|
match = (ctxt->role == rule->au_ctxt.role);
|
|
break;
|
|
case Audit_not_equal:
|
|
match = (ctxt->role != rule->au_ctxt.role);
|
|
break;
|
|
}
|
|
break;
|
|
case AUDIT_SUBJ_TYPE:
|
|
case AUDIT_OBJ_TYPE:
|
|
switch (op) {
|
|
case Audit_equal:
|
|
match = (ctxt->type == rule->au_ctxt.type);
|
|
break;
|
|
case Audit_not_equal:
|
|
match = (ctxt->type != rule->au_ctxt.type);
|
|
break;
|
|
}
|
|
break;
|
|
case AUDIT_SUBJ_SEN:
|
|
case AUDIT_SUBJ_CLR:
|
|
case AUDIT_OBJ_LEV_LOW:
|
|
case AUDIT_OBJ_LEV_HIGH:
|
|
level = ((field == AUDIT_SUBJ_SEN ||
|
|
field == AUDIT_OBJ_LEV_LOW) ?
|
|
&ctxt->range.level[0] : &ctxt->range.level[1]);
|
|
switch (op) {
|
|
case Audit_equal:
|
|
match = mls_level_eq(&rule->au_ctxt.range.level[0],
|
|
level);
|
|
break;
|
|
case Audit_not_equal:
|
|
match = !mls_level_eq(&rule->au_ctxt.range.level[0],
|
|
level);
|
|
break;
|
|
case Audit_lt:
|
|
match = (mls_level_dom(&rule->au_ctxt.range.level[0],
|
|
level) &&
|
|
!mls_level_eq(&rule->au_ctxt.range.level[0],
|
|
level));
|
|
break;
|
|
case Audit_le:
|
|
match = mls_level_dom(&rule->au_ctxt.range.level[0],
|
|
level);
|
|
break;
|
|
case Audit_gt:
|
|
match = (mls_level_dom(level,
|
|
&rule->au_ctxt.range.level[0]) &&
|
|
!mls_level_eq(level,
|
|
&rule->au_ctxt.range.level[0]));
|
|
break;
|
|
case Audit_ge:
|
|
match = mls_level_dom(level,
|
|
&rule->au_ctxt.range.level[0]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return match;
|
|
}
|
|
|
|
static int (*aurule_callback)(void) = audit_update_lsm_rules;
|
|
|
|
static int aurule_avc_callback(u32 event)
|
|
{
|
|
int err = 0;
|
|
|
|
if (event == AVC_CALLBACK_RESET && aurule_callback)
|
|
err = aurule_callback();
|
|
return err;
|
|
}
|
|
|
|
static int __init aurule_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET);
|
|
if (err)
|
|
panic("avc_add_callback() failed, error %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
__initcall(aurule_init);
|
|
|
|
#ifdef CONFIG_NETLABEL
|
|
/**
|
|
* security_netlbl_cache_add - Add an entry to the NetLabel cache
|
|
* @secattr: the NetLabel packet security attributes
|
|
* @sid: the SELinux SID
|
|
*
|
|
* Description:
|
|
* Attempt to cache the context in @ctx, which was derived from the packet in
|
|
* @skb, in the NetLabel subsystem cache. This function assumes @secattr has
|
|
* already been initialized.
|
|
*
|
|
*/
|
|
static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
|
|
u32 sid)
|
|
{
|
|
u32 *sid_cache;
|
|
|
|
sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
|
|
if (sid_cache == NULL)
|
|
return;
|
|
secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
|
|
if (secattr->cache == NULL) {
|
|
kfree(sid_cache);
|
|
return;
|
|
}
|
|
|
|
*sid_cache = sid;
|
|
secattr->cache->free = kfree;
|
|
secattr->cache->data = sid_cache;
|
|
secattr->flags |= NETLBL_SECATTR_CACHE;
|
|
}
|
|
|
|
/**
|
|
* security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
|
|
* @secattr: the NetLabel packet security attributes
|
|
* @sid: the SELinux SID
|
|
*
|
|
* Description:
|
|
* Convert the given NetLabel security attributes in @secattr into a
|
|
* SELinux SID. If the @secattr field does not contain a full SELinux
|
|
* SID/context then use SECINITSID_NETMSG as the foundation. If possible the
|
|
* 'cache' field of @secattr is set and the CACHE flag is set; this is to
|
|
* allow the @secattr to be used by NetLabel to cache the secattr to SID
|
|
* conversion for future lookups. Returns zero on success, negative values on
|
|
* failure.
|
|
*
|
|
*/
|
|
int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
|
|
u32 *sid)
|
|
{
|
|
int rc;
|
|
struct context *ctx;
|
|
struct context ctx_new;
|
|
|
|
if (!ss_initialized) {
|
|
*sid = SECSID_NULL;
|
|
return 0;
|
|
}
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
if (secattr->flags & NETLBL_SECATTR_CACHE)
|
|
*sid = *(u32 *)secattr->cache->data;
|
|
else if (secattr->flags & NETLBL_SECATTR_SECID)
|
|
*sid = secattr->attr.secid;
|
|
else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
|
|
rc = -EIDRM;
|
|
ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);
|
|
if (ctx == NULL)
|
|
goto out;
|
|
|
|
context_init(&ctx_new);
|
|
ctx_new.user = ctx->user;
|
|
ctx_new.role = ctx->role;
|
|
ctx_new.type = ctx->type;
|
|
mls_import_netlbl_lvl(&ctx_new, secattr);
|
|
if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
|
|
rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat,
|
|
secattr->attr.mls.cat);
|
|
if (rc)
|
|
goto out;
|
|
memcpy(&ctx_new.range.level[1].cat,
|
|
&ctx_new.range.level[0].cat,
|
|
sizeof(ctx_new.range.level[0].cat));
|
|
}
|
|
rc = -EIDRM;
|
|
if (!mls_context_isvalid(&policydb, &ctx_new))
|
|
goto out_free;
|
|
|
|
rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);
|
|
if (rc)
|
|
goto out_free;
|
|
|
|
security_netlbl_cache_add(secattr, *sid);
|
|
|
|
ebitmap_destroy(&ctx_new.range.level[0].cat);
|
|
} else
|
|
*sid = SECSID_NULL;
|
|
|
|
read_unlock(&policy_rwlock);
|
|
return 0;
|
|
out_free:
|
|
ebitmap_destroy(&ctx_new.range.level[0].cat);
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
|
|
* @sid: the SELinux SID
|
|
* @secattr: the NetLabel packet security attributes
|
|
*
|
|
* Description:
|
|
* Convert the given SELinux SID in @sid into a NetLabel security attribute.
|
|
* Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
|
|
{
|
|
int rc;
|
|
struct context *ctx;
|
|
|
|
if (!ss_initialized)
|
|
return 0;
|
|
|
|
read_lock(&policy_rwlock);
|
|
|
|
rc = -ENOENT;
|
|
ctx = sidtab_search(&sidtab, sid);
|
|
if (ctx == NULL)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1),
|
|
GFP_ATOMIC);
|
|
if (secattr->domain == NULL)
|
|
goto out;
|
|
|
|
secattr->attr.secid = sid;
|
|
secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
|
|
mls_export_netlbl_lvl(ctx, secattr);
|
|
rc = mls_export_netlbl_cat(ctx, secattr);
|
|
out:
|
|
read_unlock(&policy_rwlock);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_NETLABEL */
|
|
|
|
/**
|
|
* security_read_policy - read the policy.
|
|
* @data: binary policy data
|
|
* @len: length of data in bytes
|
|
*
|
|
*/
|
|
int security_read_policy(void **data, size_t *len)
|
|
{
|
|
int rc;
|
|
struct policy_file fp;
|
|
|
|
if (!ss_initialized)
|
|
return -EINVAL;
|
|
|
|
*len = security_policydb_len();
|
|
|
|
*data = vmalloc_user(*len);
|
|
if (!*data)
|
|
return -ENOMEM;
|
|
|
|
fp.data = *data;
|
|
fp.len = *len;
|
|
|
|
read_lock(&policy_rwlock);
|
|
rc = policydb_write(&policydb, &fp);
|
|
read_unlock(&policy_rwlock);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
*len = (unsigned long)fp.data - (unsigned long)*data;
|
|
return 0;
|
|
|
|
}
|