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
  63 extern const char aa_file_perm_chrs[];
  64 extern const char *aa_file_perm_names[];
  65
  66 struct 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
  88 extern struct aa_perms nullperms;
  89 extern 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
 136 void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
 137                          u32 mask);
 138 void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
 139                          u32 mask);
 140 void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
 141                         u32 chrsmask, const char * const *names, u32 namesmask);
 142 void aa_apply_modes_to_perms(struct aa_profile *profile,
 143                              struct aa_perms *perms);
 144 void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
 145                       struct aa_perms *perms);
 146 void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend);
 147 void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend);
 148 void aa_profile_match_label(struct aa_profile *profile, struct aa_label *label,
 149                             int type, u32 request, struct aa_perms *perms);
 150 int 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);
 153 int 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 */