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[MLSXFRM]: Define new SELinux service routine

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This defines a routine that combines the Type Enforcement portion of
one sid with the MLS portion from the other sid to arrive at a new
sid. This would be used to define a sid for a security association
that is to be negotiated by IKE as well as for determing the sid for
open requests and connection-oriented child sockets.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Venkat Yekkirala 2006-07-24 23:27:16 -07:00 committed by David S. Miller
parent 51bd39860f
commit 08554d6b33
4 changed files with 91 additions and 20 deletions
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2
security/selinux/include/security.h
View File

@ -78,6 +78,8 @@ int security_node_sid(u16 domain, void *addr, u32 addrlen,
int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
u16 tclass);
int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
#define SECURITY_FS_USE_XATTR 1 /* use xattr */
#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */

20
security/selinux/ss/mls.c
View File

@ -211,26 +211,6 @@ int mls_context_isvalid(struct policydb *p, struct context *c)
return 1;
}
/*
* Copies the MLS range from `src' into `dst'.
*/
static inline int mls_copy_context(struct context *dst,
struct context *src)
{
int l, rc = 0;
/* Copy the MLS range from the source context */
for (l = 0; l < 2; l++) {
dst->range.level[l].sens = src->range.level[l].sens;
rc = ebitmap_cpy(&dst->range.level[l].cat,
&src->range.level[l].cat);
if (rc)
break;
}
return rc;
}
/*
* Set the MLS fields in the security context structure
* `context' based on the string representation in

20
security/selinux/ss/mls.h
View File

@ -17,6 +17,26 @@
#include "context.h"
#include "policydb.h"
/*
* Copies the MLS range from `src' into `dst'.
*/
static inline int mls_copy_context(struct context *dst,
struct context *src)
{
int l, rc = 0;
/* Copy the MLS range from the source context */
for (l = 0; l < 2; l++) {
dst->range.level[l].sens = src->range.level[l].sens;
rc = ebitmap_cpy(&dst->range.level[l].cat,
&src->range.level[l].cat);
if (rc)
break;
}
return rc;
}
int mls_compute_context_len(struct context *context);
void mls_sid_to_context(struct context *context, char **scontext);
int mls_context_isvalid(struct policydb *p, struct context *c);

69
security/selinux/ss/services.c
View File

@ -1817,6 +1817,75 @@ out:
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 = 0;
if (!ss_initialized) {
*new_sid = sid;
goto out;
}
context_init(&newcon);
POLICY_RDLOCK;
context1 = sidtab_search(&sidtab, sid);
if (!context1) {
printk(KERN_ERR "security_sid_mls_copy: unrecognized SID "
"%d\n", sid);
rc = -EINVAL;
goto out_unlock;
}
context2 = sidtab_search(&sidtab, mls_sid);
if (!context2) {
printk(KERN_ERR "security_sid_mls_copy: unrecognized SID "
"%d\n", mls_sid);
rc = -EINVAL;
goto out_unlock;
}
newcon.user = context1->user;
newcon.role = context1->role;
newcon.type = context1->type;
rc = mls_copy_context(&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)
goto bad;
}
rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
goto out_unlock;
bad:
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);
}
out_unlock:
POLICY_RDUNLOCK;
context_destroy(&newcon);
out:
return rc;
}
struct selinux_audit_rule {
u32 au_seqno;
struct context au_ctxt;