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c092921219
Use a radix tree to provide a map between the secid and the label, and along with it a basic ability to provide secctx conversion. Shared/cached secctx will be added later. Signed-off-by: John Johansen <john.johansen@canonical.com>
470 lines
13 KiB
C
470 lines
13 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 2017 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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#include "lib.h"
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struct aa_ns;
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#define LOCAL_VEC_ENTRIES 8
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#define DEFINE_VEC(T, V) \
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struct aa_ ## T *(_ ## V ## _localtmp)[LOCAL_VEC_ENTRIES]; \
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struct aa_ ## T **(V)
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#define vec_setup(T, V, N, GFP) \
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({ \
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if ((N) <= LOCAL_VEC_ENTRIES) { \
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typeof(N) i; \
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(V) = (_ ## V ## _localtmp); \
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for (i = 0; i < (N); i++) \
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(V)[i] = NULL; \
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} else \
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(V) = kzalloc(sizeof(struct aa_ ## T *) * (N), (GFP)); \
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(V) ? 0 : -ENOMEM; \
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})
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#define vec_cleanup(T, V, N) \
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do { \
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int i; \
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for (i = 0; i < (N); i++) { \
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if (!IS_ERR_OR_NULL((V)[i])) \
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aa_put_ ## T((V)[i]); \
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} \
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if ((V) != _ ## V ## _localtmp) \
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kfree(V); \
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} while (0)
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#define vec_last(VEC, SIZE) ((VEC)[(SIZE) - 1])
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#define vec_ns(VEC, SIZE) (vec_last((VEC), (SIZE))->ns)
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#define vec_labelset(VEC, SIZE) (&vec_ns((VEC), (SIZE))->labels)
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#define cleanup_domain_vec(V, L) cleanup_label_vec((V), (L)->size)
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struct aa_profile;
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#define VEC_FLAG_TERMINATE 1
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int aa_vec_unique(struct aa_profile **vec, int n, int flags);
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struct aa_label *aa_vec_find_or_create_label(struct aa_profile **vec, int len,
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gfp_t gfp);
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#define aa_sort_and_merge_vec(N, V) \
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aa_sort_and_merge_profiles((N), (struct aa_profile **)(V))
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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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};
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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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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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FLAG_EXPLICIT = 0x400, /* explicit static label */
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FLAG_STALE = 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_proxy {
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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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* @proxy: 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: stale and other flags - values may change under label set lock
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* @secid: secid 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_proxy *proxy;
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__counted char *hname;
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long flags;
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u32 secid;
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int size;
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struct aa_profile *vec[];
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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_is_stale(X) ((X)->flags & FLAG_STALE)
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#define __label_make_stale(X) ((X)->flags |= FLAG_STALE)
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#define labels_ns(X) (vec_ns(&((X)->vec[0]), (X)->size))
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#define labels_set(X) (&labels_ns(X)->labels)
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#define labels_profile(X) ((X)->vec[(X)->size - 1])
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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)->vec[(I).i]); ++((I).i))
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/* assumes break/goto ended label_for_each */
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#define label_for_each_cont(I, L, P) \
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for (++((I).i); ((P) = (L)->vec[(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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/* 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)->vec[(I).i]) && ((P2) = (L2)->vec[(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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/* 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)->vec[(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 next_in_ns(i, NS, L) \
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({ \
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typeof(i) ___i = (i); \
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while ((L)->vec[___i] && (L)->vec[___i]->ns != (NS)) \
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(___i)++; \
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(___i); \
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})
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#define label_for_each_in_ns(I, NS, L, P) \
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for ((I).i = next_in_ns(0, (NS), (L)); \
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((P) = (L)->vec[(I).i]); \
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(I).i = next_in_ns((I).i + 1, (NS), (L)))
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#define fn_for_each_in_ns(L, P, FN) \
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({ \
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struct label_it __i; \
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struct aa_ns *__ns = labels_ns(L); \
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int __E = 0; \
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label_for_each_in_ns(__i, __ns, (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_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_subtree(struct aa_ns *ns);
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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, gfp_t gfp);
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struct aa_label *aa_label_alloc(int size, struct aa_proxy *proxy, 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_label *label);
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struct aa_label *aa_label_insert(struct aa_labelset *ls, struct aa_label *l);
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bool aa_label_replace(struct aa_label *old, 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_label *l);
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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_ns *ns, struct aa_label *label, gfp_t gfp);
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#define FLAGS_NONE 0
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#define FLAG_SHOW_MODE 1
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#define FLAG_VIEW_SUBNS 2
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#define FLAG_HIDDEN_UNCONFINED 4
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#define FLAG_ABS_ROOT 8
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int aa_label_snxprint(char *str, size_t size, struct aa_ns *view,
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struct aa_label *label, int flags);
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int aa_label_asxprint(char **strp, struct aa_ns *ns, struct aa_label *label,
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int flags, gfp_t gfp);
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int aa_label_acntsxprint(char __counted **strp, struct aa_ns *ns,
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struct aa_label *label, int flags, gfp_t gfp);
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void aa_label_xaudit(struct audit_buffer *ab, struct aa_ns *ns,
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struct aa_label *label, int flags, gfp_t gfp);
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void aa_label_seq_xprint(struct seq_file *f, struct aa_ns *ns,
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struct aa_label *label, int flags, gfp_t gfp);
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void aa_label_xprintk(struct aa_ns *ns, struct aa_label *label, int flags,
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gfp_t gfp);
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void aa_label_audit(struct audit_buffer *ab, struct aa_label *label, gfp_t gfp);
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void aa_label_seq_print(struct seq_file *f, struct aa_label *label, gfp_t gfp);
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void aa_label_printk(struct aa_label *label, gfp_t gfp);
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struct aa_label *aa_label_strn_parse(struct aa_label *base, const char *str,
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size_t n, gfp_t gfp, bool create,
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bool force_stack);
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struct aa_label *aa_label_parse(struct aa_label *base, const char *str,
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gfp_t gfp, bool create, bool force_stack);
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static inline const char *aa_label_strn_split(const char *str, int n)
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{
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const char *pos;
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unsigned int state;
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state = aa_dfa_matchn_until(stacksplitdfa, DFA_START, str, n, &pos);
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if (!ACCEPT_TABLE(stacksplitdfa)[state])
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return NULL;
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return pos - 3;
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}
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static inline const char *aa_label_str_split(const char *str)
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{
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const char *pos;
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unsigned int state;
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state = aa_dfa_match_until(stacksplitdfa, DFA_START, str, &pos);
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if (!ACCEPT_TABLE(stacksplitdfa)[state])
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return NULL;
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return pos - 3;
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}
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struct aa_perms;
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int aa_label_match(struct aa_profile *profile, struct aa_label *label,
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unsigned int state, bool subns, u32 request,
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struct aa_perms *perms);
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/**
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* __aa_get_label - get a reference count to uncounted label reference
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* @l: reference to get a count on
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*
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* Returns: pointer to reference OR NULL if race is lost and reference is
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* being repeated.
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* Requires: lock held, and the return code MUST be checked
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*/
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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 && kref_get_unless_zero(&l->count))
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return l;
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return NULL;
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}
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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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/**
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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_unless_zero(&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_is_stale(l)) {
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struct aa_label *tmp;
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AA_BUG(!l->proxy);
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AA_BUG(!l->proxy->label);
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/* BUG: only way this can happen is @l ref count and its
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* replacement count have gone to 0 and are on their way
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* to destruction. ie. we have a refcounting error
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*/
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tmp = aa_get_label_rcu(&l->proxy->label);
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AA_BUG(!tmp);
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return tmp;
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}
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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_proxy *aa_alloc_proxy(struct aa_label *l, gfp_t gfp);
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void aa_proxy_kref(struct kref *kref);
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static inline struct aa_proxy *aa_get_proxy(struct aa_proxy *proxy)
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{
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if (proxy)
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kref_get(&(proxy->count));
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return proxy;
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}
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static inline void aa_put_proxy(struct aa_proxy *proxy)
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{
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if (proxy)
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kref_put(&proxy->count, aa_proxy_kref);
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}
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void __aa_proxy_redirect(struct aa_label *orig, struct aa_label *new);
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#endif /* __AA_LABEL_H */
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