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[/] [test_project/] [trunk/] [linux_sd_driver/] [security/] [selinux/] [ss/] [context.h] - Blame information for rev 67

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 * A security context is a set of security attributes
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 * associated with each subject and object controlled
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 * by the security policy.  Security contexts are
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  * externally represented as variable-length strings
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 * that can be interpreted by a user or application
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 * with an understanding of the security policy.
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 * Internally, the security server uses a simple
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 * structure.  This structure is private to the
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 * security server and can be changed without affecting
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 * clients of the security server.
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 *
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 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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 */
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#ifndef _SS_CONTEXT_H_
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#define _SS_CONTEXT_H_
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#include "ebitmap.h"
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#include "mls_types.h"
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#include "security.h"
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/*
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 * A security context consists of an authenticated user
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 * identity, a role, a type and a MLS range.
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 */
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struct context {
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        u32 user;
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        u32 role;
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        u32 type;
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        struct mls_range range;
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};
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static inline void mls_context_init(struct context *c)
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{
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        memset(&c->range, 0, sizeof(c->range));
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}
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static inline int mls_context_cpy(struct context *dst, struct context *src)
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{
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        int rc;
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        if (!selinux_mls_enabled)
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                return 0;
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        dst->range.level[0].sens = src->range.level[0].sens;
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        rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
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        if (rc)
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                goto out;
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        dst->range.level[1].sens = src->range.level[1].sens;
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        rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
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        if (rc)
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                ebitmap_destroy(&dst->range.level[0].cat);
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out:
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        return rc;
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}
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/*
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 * Sets both levels in the MLS range of 'dst' to the low level of 'src'.
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 */
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static inline int mls_context_cpy_low(struct context *dst, struct context *src)
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{
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        int rc;
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        if (!selinux_mls_enabled)
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                return 0;
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        dst->range.level[0].sens = src->range.level[0].sens;
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        rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
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        if (rc)
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                goto out;
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        dst->range.level[1].sens = src->range.level[0].sens;
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        rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
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        if (rc)
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                ebitmap_destroy(&dst->range.level[0].cat);
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out:
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        return rc;
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}
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static inline int mls_context_cmp(struct context *c1, struct context *c2)
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{
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        if (!selinux_mls_enabled)
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                return 1;
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        return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
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                ebitmap_cmp(&c1->range.level[0].cat,&c2->range.level[0].cat) &&
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                (c1->range.level[1].sens == c2->range.level[1].sens) &&
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                ebitmap_cmp(&c1->range.level[1].cat,&c2->range.level[1].cat));
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}
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static inline void mls_context_destroy(struct context *c)
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{
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        if (!selinux_mls_enabled)
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                return;
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        ebitmap_destroy(&c->range.level[0].cat);
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        ebitmap_destroy(&c->range.level[1].cat);
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        mls_context_init(c);
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}
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static inline void context_init(struct context *c)
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{
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        memset(c, 0, sizeof(*c));
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}
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static inline int context_cpy(struct context *dst, struct context *src)
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{
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        dst->user = src->user;
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        dst->role = src->role;
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        dst->type = src->type;
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        return mls_context_cpy(dst, src);
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}
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static inline void context_destroy(struct context *c)
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{
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        c->user = c->role = c->type = 0;
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        mls_context_destroy(c);
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}
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static inline int context_cmp(struct context *c1, struct context *c2)
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{
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        return ((c1->user == c2->user) &&
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                (c1->role == c2->role) &&
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                (c1->type == c2->type) &&
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                mls_context_cmp(c1, c2));
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}
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#endif  /* _SS_CONTEXT_H_ */
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