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[PATCH] selinux: add support for range transitions on object classes 

Introduces support for policy version 21.  This version of the binary
kernel policy allows for defining range transitions on security classes
other than the process security class.  As always, backwards compatibility
for older formats is retained.  The security class is read in as specified
when using the new format, while the "process" security class is assumed
when using an older policy format.

Signed-off-by: Darrel Goeddel <dgoeddel@trustedcs.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Darrel Goeddel 2006-09-25 23:31:59 -07:00 committed by Linus Torvalds
parent 016b9bdb81
commit f3f8771420
5 changed files with 37 additions and 23 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 20
range 15 21
default 19
help
This option sets the value for the maximum policy format version

3
security/selinux/include/security.h
View File

@ -24,13 +24,14 @@
#define POLICYDB_VERSION_VALIDATETRANS 19
#define POLICYDB_VERSION_MLS 19
#define POLICYDB_VERSION_AVTAB 20
#define POLICYDB_VERSION_RANGETRANS 21
/* 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_AVTAB
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_RANGETRANS
#endif
extern int selinux_enabled;

15
security/selinux/ss/mls.c
View File

@ -530,22 +530,21 @@ int mls_compute_sid(struct context *scontext,
u32 specified,
struct context *newcontext)
{
struct range_trans *rtr;
if (!selinux_mls_enabled)
return 0;
switch (specified) {
case AVTAB_TRANSITION:
if (tclass == SECCLASS_PROCESS) {
struct range_trans *rangetr;
/* Look for a range transition rule. */
for (rangetr = policydb.range_tr; rangetr;
rangetr = rangetr->next) {
if (rangetr->dom == scontext->type &&
rangetr->type == tcontext->type) {
for (rtr = policydb.range_tr; rtr; rtr = rtr->next) {
if (rtr->source_type == scontext->type &&
rtr->target_type == tcontext->type &&
rtr->target_class == tclass) {
/* Set the range from the rule */
return mls_range_set(newcontext,
&rangetr->range);
}
&rtr->target_range);
}
}
/* Fallthrough */

27
security/selinux/ss/policydb.c
View File

@ -96,6 +96,11 @@ static struct policydb_compat_info policydb_compat[] = {
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
},
{
.version = POLICYDB_VERSION_RANGETRANS,
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
},
};
static struct policydb_compat_info *policydb_lookup_compat(int version)
@ -645,15 +650,15 @@ void policydb_destroy(struct policydb *p)
for (rt = p->range_tr; rt; rt = rt -> next) {
if (lrt) {
ebitmap_destroy(&lrt->range.level[0].cat);
ebitmap_destroy(&lrt->range.level[1].cat);
ebitmap_destroy(&lrt->target_range.level[0].cat);
ebitmap_destroy(&lrt->target_range.level[1].cat);
kfree(lrt);
}
lrt = rt;
}
if (lrt) {
ebitmap_destroy(&lrt->range.level[0].cat);
ebitmap_destroy(&lrt->range.level[1].cat);
ebitmap_destroy(&lrt->target_range.level[0].cat);
ebitmap_destroy(&lrt->target_range.level[1].cat);
kfree(lrt);
}
@ -1829,6 +1834,7 @@ int policydb_read(struct policydb *p, void *fp)
}
if (p->policyvers >= POLICYDB_VERSION_MLS) {
int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
rc = next_entry(buf, fp, sizeof(u32));
if (rc < 0)
goto bad;
@ -1847,9 +1853,16 @@ int policydb_read(struct policydb *p, void *fp)
rc = next_entry(buf, fp, (sizeof(u32) * 2));
if (rc < 0)
goto bad;
rt->dom = le32_to_cpu(buf[0]);
rt->type = le32_to_cpu(buf[1]);
rc = mls_read_range_helper(&rt->range, fp);
rt->source_type = le32_to_cpu(buf[0]);
rt->target_type = le32_to_cpu(buf[1]);
if (new_rangetr) {
rc = next_entry(buf, fp, sizeof(u32));
if (rc < 0)
goto bad;
rt->target_class = le32_to_cpu(buf[0]);
} else
rt->target_class = SECCLASS_PROCESS;
rc = mls_read_range_helper(&rt->target_range, fp);
if (rc)
goto bad;
lrt = rt;

7
security/selinux/ss/policydb.h
View File

@ -106,9 +106,10 @@ struct cat_datum {
};
struct range_trans {
u32 dom; /* current process domain */
u32 type; /* program executable type */
struct mls_range range; /* new range */
u32 source_type;
u32 target_type;
u32 target_class;
struct mls_range target_range;
struct range_trans *next;
};