LXR linux/security/apparmor/include/perms.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * AppArmor security module
   4 *
   5 * This file contains AppArmor basic permission sets definitions.
   6 *
   7 * Copyright 2017 Canonical Ltd.
   8 */
   9
  10#ifndef __AA_PERM_H
  11#define __AA_PERM_H
  12
  13#include <linux/fs.h>
  14#include "label.h"
  15
  16#define AA_MAY_EXEC             MAY_EXEC
  17#define AA_MAY_WRITE            MAY_WRITE
  18#define AA_MAY_READ             MAY_READ
  19#define AA_MAY_APPEND           MAY_APPEND
  20
  21#define AA_MAY_CREATE           0x0010
  22#define AA_MAY_DELETE           0x0020
  23#define AA_MAY_OPEN             0x0040
  24#define AA_MAY_RENAME           0x0080          /* pair */
  25
  26#define AA_MAY_SETATTR          0x0100          /* meta write */
  27#define AA_MAY_GETATTR          0x0200          /* meta read */
  28#define AA_MAY_SETCRED          0x0400          /* security cred/attr */
  29#define AA_MAY_GETCRED          0x0800
  30
  31#define AA_MAY_CHMOD            0x1000          /* pair */
  32#define AA_MAY_CHOWN            0x2000          /* pair */
  33#define AA_MAY_CHGRP            0x4000          /* pair */
  34#define AA_MAY_LOCK             0x8000          /* LINK_SUBSET overlaid */
  35
  36#define AA_EXEC_MMAP            0x00010000
  37#define AA_MAY_MPROT            0x00020000      /* extend conditions */
  38#define AA_MAY_LINK             0x00040000      /* pair */
  39#define AA_MAY_SNAPSHOT         0x00080000      /* pair */
  40
  41#define AA_MAY_DELEGATE
  42#define AA_CONT_MATCH           0x08000000
  43
  44#define AA_MAY_STACK            0x10000000
  45#define AA_MAY_ONEXEC           0x20000000 /* either stack or change_profile */
  46#define AA_MAY_CHANGE_PROFILE   0x40000000
  47#define AA_MAY_CHANGEHAT        0x80000000
  48
  49#define AA_LINK_SUBSET          AA_MAY_LOCK     /* overlaid */
  50
  51
  52#define PERMS_CHRS_MASK (MAY_READ | MAY_WRITE | AA_MAY_CREATE |         \
  53                         AA_MAY_DELETE | AA_MAY_LINK | AA_MAY_LOCK |    \
  54                         AA_MAY_EXEC | AA_EXEC_MMAP | AA_MAY_APPEND)
  55
  56#define PERMS_NAMES_MASK (PERMS_CHRS_MASK | AA_MAY_OPEN | AA_MAY_RENAME |     \
  57                          AA_MAY_SETATTR | AA_MAY_GETATTR | AA_MAY_SETCRED | \
  58                          AA_MAY_GETCRED | AA_MAY_CHMOD | AA_MAY_CHOWN | \
  59                          AA_MAY_CHGRP | AA_MAY_MPROT | AA_MAY_SNAPSHOT | \
  60                          AA_MAY_STACK | AA_MAY_ONEXEC |                \
  61                          AA_MAY_CHANGE_PROFILE | AA_MAY_CHANGEHAT)
  62
  63extern const char aa_file_perm_chrs[];
  64extern const char *aa_file_perm_names[];
  65
  66struct aa_perms {
  67        u32 allow;
  68        u32 audit;      /* set only when allow is set */
  69
  70        u32 deny;       /* explicit deny, or conflict if allow also set */
  71        u32 quiet;      /* set only when ~allow | deny */
  72        u32 kill;       /* set only when ~allow | deny */
  73        u32 stop;       /* set only when ~allow | deny */
  74
  75        u32 complain;   /* accumulates only used when ~allow & ~deny */
  76        u32 cond;       /* set only when ~allow and ~deny */
  77
  78        u32 hide;       /* set only when  ~allow | deny */
  79        u32 prompt;     /* accumulates only used when ~allow & ~deny */
  80
  81        /* Reserved:
  82         * u32 subtree; / * set only when allow is set * /
  83         */
  84        u16 xindex;
  85};
  86
  87#define ALL_PERMS_MASK 0xffffffff
  88extern struct aa_perms nullperms;
  89extern struct aa_perms allperms;
  90
  91
  92#define xcheck(FN1, FN2)        \
  93({                              \
  94        int e, error = FN1;     \
  95        e = FN2;                \
  96        if (e)                  \
  97                error = e;      \
  98        error;                  \
  99})
 100
 101
 102/*
 103 * TODO: update for labels pointing to labels instead of profiles
 104 * TODO: optimize the walk, currently does subwalk of L2 for each P in L1
 105 * gah this doesn't allow for label compound check!!!!
 106 */
 107#define xcheck_ns_profile_profile(P1, P2, FN, args...)          \
 108({                                                              \
 109        int ____e = 0;                                          \
 110        if (P1->ns == P2->ns)                                   \
 111                ____e = FN((P1), (P2), args);                   \
 112        (____e);                                                \
 113})
 114
 115#define xcheck_ns_profile_label(P, L, FN, args...)              \
 116({                                                              \
 117        struct aa_profile *__p2;                                \
 118        fn_for_each((L), __p2,                                  \
 119                    xcheck_ns_profile_profile((P), __p2, (FN), args));  \
 120})
 121
 122#define xcheck_ns_labels(L1, L2, FN, args...)                   \
 123({                                                              \
 124        struct aa_profile *__p1;                                \
 125        fn_for_each((L1), __p1, FN(__p1, (L2), args));          \
 126})
 127
 128/* Do the cross check but applying FN at the profiles level */
 129#define xcheck_labels_profiles(L1, L2, FN, args...)             \
 130        xcheck_ns_labels((L1), (L2), xcheck_ns_profile_label, (FN), args)
 131
 132#define xcheck_labels(L1, L2, P, FN1, FN2)                      \
 133        xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2)))
 134
 135
 136void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
 137                         u32 mask);
 138void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
 139                         u32 mask);
 140void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
 141                        u32 chrsmask, const char * const *names, u32 namesmask);
 142void aa_apply_modes_to_perms(struct aa_profile *profile,
 143                             struct aa_perms *perms);
 144void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
 145                      struct aa_perms *perms);
 146void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend);
 147void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend);
 148void aa_profile_match_label(struct aa_profile *profile, struct aa_label *label,
 149                            int type, u32 request, struct aa_perms *perms);
 150int aa_profile_label_perm(struct aa_profile *profile, struct aa_profile *target,
 151                          u32 request, int type, u32 *deny,
 152                          struct common_audit_data *sa);
 153int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms,
 154                   u32 request, struct common_audit_data *sa,
 155                   void (*cb)(struct audit_buffer *, void *));
 156#endif /* __AA_PERM_H */
 157