420 lines
11 KiB
C
420 lines
11 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor label definitions
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*
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* Copyright 2013 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#ifndef __AA_LABEL_H
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#define __AA_LABEL_H
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#include <linux/atomic.h>
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#include <linux/audit.h>
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#include <linux/rbtree.h>
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#include <linux/rcupdate.h>
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#include "apparmor.h"
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struct aa_namespace;
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struct labelset_stats {
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atomic_t sread;
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atomic_t fread;
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atomic_t msread;
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atomic_t mfread;
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atomic_t insert;
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atomic_t existing;
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atomic_t minsert;
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atomic_t mexisting;
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atomic_t invalid; /* outstanding invalid */
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};
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struct label_stats {
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struct labelset_stats set_stats;
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atomic_t allocated;
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atomic_t failed;
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atomic_t freed;
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atomic_t printk_name_alloc;
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atomic_t printk_name_fail;
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atomic_t seq_print_name_alloc;
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atomic_t seq_print_name_fail;
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atomic_t audit_name_alloc;
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atomic_t audit_name_fail;
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};
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#ifdef AA_LABEL_STATS
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#define labelstats_inc(X) atomic_inc(stats.(X))
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#define labelstats_dec(X) atomic_dec(stats.(X))
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#define labelsetstats_inc(LS, X) \
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do { \
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labelstats_inc(set_stats.##X); \
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atomic_inc((LS)->stats.(X)); \
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} while (0)
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#define labelsetstats_dec(LS, X) \
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do { \
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labelstats_dec(set_stats.##X); \
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atomic_dec((LS)->stats.(X)); \
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} while (0)
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#else
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#define labelstats_inc(X)
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#define labelstats_dec(X)
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#define labelsetstats_inc(LS, X)
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#define labelsetstats_dec(LS, X)
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#endif
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#define labelstats_init(X)
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/* struct aa_labelset - set of labels for a namespace
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*
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* Labels are reference counted; aa_labelset does not contribute to label
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* reference counts. Once a label's last refcount is put it is removed from
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* the set.
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*/
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struct aa_labelset {
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rwlock_t lock;
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struct rb_root root;
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/* stats */
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#ifdef APPARMOR_LABEL_STATS
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struct labelset_stats stats;
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#endif
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};
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#define __labelset_for_each(LS, N) \
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for((N) = rb_first(&(LS)->root); (N); (N) = rb_next(N))
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void aa_labelset_destroy(struct aa_labelset *ls);
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void aa_labelset_init(struct aa_labelset *ls);
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enum label_flags {
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FLAG_HAT = 1, /* profile is a hat */
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FLAG_UNCONFINED = 2, /* label unconfined only if all
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* constituant profiles unconfined */
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FLAG_NULL = 4, /* profile is null learning profile */
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FLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
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FLAG_IMMUTIBLE = 0x10, /* don't allow changes/replacement */
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FLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
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FLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
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FLAG_NS_COUNT = 0x80, /* carries NS ref count */
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FLAG_IN_TREE = 0x100, /* label is in tree */
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FLAG_PROFILE = 0x200, /* label is a profile */
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FALG_EXPLICIT = 0x400, /* explict static label */
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FLAG_INVALID = 0x800, /* replaced/removed */
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FLAG_RENAMED = 0x1000, /* label has renaming in it */
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FLAG_REVOKED = 0x2000, /* label has revocation in it */
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/* These flags must correspond with PATH_flags */
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/* TODO: add new path flags */
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};
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struct aa_label;
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struct aa_replacedby {
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struct kref count;
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struct aa_label __rcu *label;
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};
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struct label_it {
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int i, j;
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};
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/* struct aa_label - lazy labeling struct
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* @count: ref count of active users
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* @node: rbtree position
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* @rcu: rcu callback struct
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* @replacedby: is set to the label that replaced this label
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* @hname: text representation of the label (MAYBE_NULL)
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* @flags: invalid and other flags - values may change under label set lock
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* @sid: sid that references this label
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* @size: number of entries in @ent[]
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* @ent: set of profiles for label, actual size determined by @size
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*/
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struct aa_label {
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struct kref count;
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struct rb_node node;
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struct rcu_head rcu;
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struct aa_replacedby *replacedby;
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__counted char *hname;
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long flags;
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u32 sid;
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int size;
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struct aa_profile *ent[2];
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};
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#define last_error(E, FN) \
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do { \
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int __subE = (FN); \
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if (__subE) \
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(E) = __subE; \
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} while (0)
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#define label_isprofile(X) ((X)->flags & FLAG_PROFILE)
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#define label_unconfined(X) ((X)->flags & FLAG_UNCONFINED)
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#define unconfined(X) label_unconfined(X)
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#define label_invalid(X) ((X)->flags & FLAG_INVALID)
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#define __label_invalidate(X) do { \
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labelsetstats_inc(labels_set(X), invalid); \
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((X)->flags |= FLAG_INVALID); \
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} while (0)
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#define labels_last(X) ((X)->ent[(X)->size - 1])
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#define labels_ns(X) (labels_last(X)->ns)
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#define labels_set(X) (&labels_ns(X)->labels)
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#define labels_profile(X) ({ \
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AA_BUG(!label_isprofile(X)); \
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container_of((X), struct aa_profile, label); \
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})
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int aa_label_next_confined(struct aa_label *l, int i);
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/* for each profile in a label */
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#define label_for_each(I, L, P) \
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for ((I).i = 0; ((P) = (L)->ent[(I).i]); ++((I).i))
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#define label_for_each_at(I, L, P) \
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for (; ((P) = (L)->ent[(I).i]); ++((I).i))
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#define next_comb(I, L1, L2) \
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do { \
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(I).j++; \
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if ((I).j >= (L2)->size) { \
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(I).i++; \
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(I).j = 0; \
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} \
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} while (0)
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/* TODO: label_for_each_ns_comb */
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/* for each combination of P1 in L1, and P2 in L2 */
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#define label_for_each_comb(I, L1, L2, P1, P2) \
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for ((I).i = (I).j = 0; \
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((P1) = (L1)->ent[(I).i]) && ((P2) = (L2)->ent[(I).j]); \
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(I) = next_comb(I, L1, L2))
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#define fn_for_each_comb(L1, L2, P1, P2, FN) \
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({ \
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struct label_it i; \
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int __E = 0; \
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label_for_each_comb(i, (L1), (L2), (P1), (P2)) { \
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last_error(__E, (FN)); \
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} \
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__E; \
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})
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/* internal cross check */
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//fn_for_each_comb(L1, L2, P1, P2, xcheck(...));
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/* external cross check */
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// xcheck(fn_for_each_comb(L1, L2, ...),
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// fn_for_each_comb(L2, L1, ...));
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/* for each profile that is enforcing confinement in a label */
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#define label_for_each_confined(I, L, P) \
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for ((I).i = aa_label_next_confined((L), 0); \
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((P) = (L)->ent[(I).i]); \
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(I).i = aa_label_next_confined((L), (I).i + 1))
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#define label_for_each_in_merge(I, A, B, P) \
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for ((I).i = (I).j = 0; \
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((P) = aa_label_next_in_merge(&(I), (A), (B))); \
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)
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#define label_for_each_not_in_set(I, SET, SUB, P) \
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for ((I).i = (I).j = 0; \
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((P) = aa_label_next_not_in_set(&(I), (SET), (SUB))); \
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)
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#define fn_for_each_XXX(L, P, FN, ...) \
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({ \
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struct label_it i; \
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int __E = 0; \
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label_for_each ## __VA_ARGS__ (i, (L), (P)) { \
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last_error(__E, (FN)); \
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} \
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__E; \
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})
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#define fn_for_each(L, P, FN) fn_for_each_XXX(L, P, FN)
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#define fn_for_each_confined(L, P, FN) fn_for_each_XXX(L, P, FN, _confined)
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#define fn_for_each2_XXX(L1, L2, P, FN, ...) \
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({ \
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struct label_it i; \
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int __E = 0; \
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label_for_each ## __VA_ARGS__(i, (L1), (L2), (P)) { \
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last_error(__E, (FN)); \
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} \
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__E; \
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})
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#define fn_for_each_in_merge(L1, L2, P, FN) \
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fn_for_each2_XXX((L1), (L2), P, FN, _in_merge)
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#define fn_for_each_not_in_set(L1, L2, P, FN) \
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fn_for_each2_XXX((L1), (L2), P, FN, _not_in_set)
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#define LABEL_MEDIATES(L, C) \
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({ \
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struct aa_profile *profile; \
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struct label_it i; \
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int ret = 0; \
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label_for_each(i, (L), profile) { \
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if (PROFILE_MEDIATES(profile, (C))) { \
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ret = 1; \
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break; \
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} \
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} \
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ret; \
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})
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void aa_labelset_destroy(struct aa_labelset *ls);
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void aa_labelset_init(struct aa_labelset *ls);
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void __aa_labelset_update_all(struct aa_namespace *ns);
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void aa_label_destroy(struct aa_label *label);
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void aa_label_free(struct aa_label *label);
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void aa_label_kref(struct kref *kref);
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bool aa_label_init(struct aa_label *label, int size);
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struct aa_label *aa_label_alloc(int size, gfp_t gfp);
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bool aa_label_is_subset(struct aa_label *set, struct aa_label *sub);
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struct aa_profile * aa_label_next_not_in_set(struct label_it *I,
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struct aa_label *set,
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struct aa_label *sub);
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bool aa_label_remove(struct aa_labelset *ls, struct aa_label *label);
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struct aa_label *aa_label_insert(struct aa_labelset *ls, struct aa_label *l);
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struct aa_label *aa_label_remove_and_insert(struct aa_labelset *ls,
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struct aa_label *remove,
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struct aa_label *insert);
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bool aa_label_replace(struct aa_labelset *ls, struct aa_label *old,
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struct aa_label *new);
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bool aa_label_make_newest(struct aa_labelset *ls, struct aa_label *old,
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struct aa_label *new);
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struct aa_label *aa_label_find(struct aa_labelset *ls, struct aa_label *l);
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struct aa_label *aa_label_vec_find(struct aa_labelset *ls,
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struct aa_profile **vec,
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int n);
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struct aa_label *aa_label_vec_merge(struct aa_profile **vec, int len,
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gfp_t gfp);
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struct aa_profile *aa_label_next_in_merge(struct label_it *I,
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struct aa_label *a,
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struct aa_label *b);
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struct aa_label *aa_label_find_merge(struct aa_label *a, struct aa_label *b);
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struct aa_label *aa_label_merge(struct aa_label *a, struct aa_label *b,
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gfp_t gfp);
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bool aa_update_label_name(struct aa_namespace *ns, struct aa_label *label,
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gfp_t gfp);
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int aa_profile_snprint(char *str, size_t size, struct aa_namespace *ns,
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struct aa_profile *profile, bool mode);
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int aa_label_snprint(char *str, size_t size, struct aa_namespace *ns,
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struct aa_label *label, bool mode);
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int aa_label_asprint(char **strp, struct aa_namespace *ns,
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struct aa_label *label, bool mode, gfp_t gfp);
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int aa_label_acntsprint(char __counted **strp, struct aa_namespace *ns,
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struct aa_label *label, bool mode, gfp_t gfp);
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void aa_label_audit(struct audit_buffer *ab, struct aa_namespace *ns,
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struct aa_label *label, bool mode, gfp_t gfp);
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void aa_label_seq_print(struct seq_file *f, struct aa_namespace *ns,
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struct aa_label *label, bool mode, gfp_t gfp);
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void aa_label_printk(struct aa_namespace *ns, struct aa_label *label,
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bool mode, gfp_t gfp);
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struct aa_label *aa_label_parse(struct aa_label *base, char *str,
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gfp_t gfp, bool create);
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static inline struct aa_label *aa_get_label(struct aa_label *l)
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{
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if (l)
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kref_get(&(l->count));
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return l;
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}
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static inline struct aa_label *aa_get_label_not0(struct aa_label *l)
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{
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if (l && kref_get_not0(&l->count))
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return l;
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return NULL;
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}
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/**
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* aa_get_label_rcu - increment refcount on a label that can be replaced
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* @l: pointer to label that can be replaced (NOT NULL)
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*
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* Returns: pointer to a refcounted label.
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* else NULL if no label
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*/
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static inline struct aa_label *aa_get_label_rcu(struct aa_label __rcu **l)
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{
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struct aa_label *c;
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rcu_read_lock();
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do {
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c = rcu_dereference(*l);
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} while (c && !kref_get_not0(&c->count));
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rcu_read_unlock();
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return c;
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}
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/**
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* aa_get_newest_label - find the newest version of @l
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* @l: the label to check for newer versions of
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*
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* Returns: refcounted newest version of @l taking into account
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* replacement, renames and removals
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* return @l.
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*/
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static inline struct aa_label *aa_get_newest_label(struct aa_label *l)
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{
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if (!l)
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return NULL;
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if (label_invalid(l))
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return aa_get_label_rcu(&l->replacedby->label);
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return aa_get_label(l);
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}
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static inline void aa_put_label(struct aa_label *l)
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{
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if (l)
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kref_put(&l->count, aa_label_kref);
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}
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struct aa_replacedby *aa_alloc_replacedby(struct aa_label *l);
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void aa_free_replacedby_kref(struct kref *kref);
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static inline struct aa_replacedby *aa_get_replacedby(struct aa_replacedby *r)
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{
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if (r)
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kref_get(&(r->count));
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return r;
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}
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static inline void aa_put_replacedby(struct aa_replacedby *r)
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{
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if (r)
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kref_put(&r->count, aa_free_replacedby_kref);
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}
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void __aa_update_replacedby(struct aa_label *orig, struct aa_label *new);
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#endif /* __AA_LABEL_H */
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