1 files changed, 107 insertions, 0 deletions

diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
new file mode 100644
index 000000000000..0562bacb7b99
--- /dev/null
+++ b/security/selinux/ss/context.h
@@ -0,0 +1,107 @@
+/*
+ * A security context is a set of security attributes
+ * associated with each subject and object controlled
+ * by the security policy.  Security contexts are
+  * externally represented as variable-length strings
+ * that can be interpreted by a user or application
+ * with an understanding of the security policy.
+ * Internally, the security server uses a simple
+ * structure.  This structure is private to the
+ * security server and can be changed without affecting
+ * clients of the security server.
+ *
+ * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
+ */
+#ifndef _SS_CONTEXT_H_
+#define _SS_CONTEXT_H_
+
+#include "ebitmap.h"
+#include "mls_types.h"
+#include "security.h"
+
+/*
+ * A security context consists of an authenticated user
+ * identity, a role, a type and a MLS range.
+ */
+struct context {
+        u32 user;
+        u32 role;
+        u32 type;
+        struct mls_range range;
+};
+
+static inline void mls_context_init(struct context *c)
+{
+        memset(&c->range, 0, sizeof(c->range));
+}
+
+static inline int mls_context_cpy(struct context *dst, struct context *src)
+{
+        int rc;
+
+        if (!selinux_mls_enabled)
+                return 0;
+
+        dst->range.level[0].sens = src->range.level[0].sens;
+        rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
+        if (rc)
+                goto out;
+
+        dst->range.level[1].sens = src->range.level[1].sens;
+        rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
+        if (rc)
+                ebitmap_destroy(&dst->range.level[0].cat);
+out:
+        return rc;
+}
+
+static inline int mls_context_cmp(struct context *c1, struct context *c2)
+{
+        if (!selinux_mls_enabled)
+                return 1;
+
+        return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
+                ebitmap_cmp(&c1->range.level[0].cat,&c2->range.level[0].cat) &&
+                (c1->range.level[1].sens == c2->range.level[1].sens) &&
+                ebitmap_cmp(&c1->range.level[1].cat,&c2->range.level[1].cat));
+}
+
+static inline void mls_context_destroy(struct context *c)
+{
+        if (!selinux_mls_enabled)
+                return;
+
+        ebitmap_destroy(&c->range.level[0].cat);
+        ebitmap_destroy(&c->range.level[1].cat);
+        mls_context_init(c);
+}
+
+static inline void context_init(struct context *c)
+{
+        memset(c, 0, sizeof(*c));
+}
+
+static inline int context_cpy(struct context *dst, struct context *src)
+{
+        dst->user = src->user;
+        dst->role = src->role;
+        dst->type = src->type;
+        return mls_context_cpy(dst, src);
+}
+
+static inline void context_destroy(struct context *c)
+{
+        c->user = c->role = c->type = 0;
+        mls_context_destroy(c);
+}
+
+static inline int context_cmp(struct context *c1, struct context *c2)
+{
+        return ((c1->user == c2->user) &&
+                (c1->role == c2->role) &&
+                (c1->type == c2->type) &&
+                mls_context_cmp(c1, c2));
+}
+
+#endif  /* _SS_CONTEXT_H_ */
+