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7f3ebcf2b1
Don't read past the end of the buffer containing permissions
characters or write past the end of the destination string.
Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access")
Fixes: e53cfe6c7c ("apparmor: rework perm mapping to a slightly broader set")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
160 lines
4.9 KiB
C
160 lines
4.9 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor basic permission sets 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_PERM_H
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#define __AA_PERM_H
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#include <linux/fs.h>
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#include "label.h"
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#define AA_MAY_EXEC MAY_EXEC
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#define AA_MAY_WRITE MAY_WRITE
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#define AA_MAY_READ MAY_READ
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#define AA_MAY_APPEND MAY_APPEND
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#define AA_MAY_CREATE 0x0010
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#define AA_MAY_DELETE 0x0020
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#define AA_MAY_OPEN 0x0040
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#define AA_MAY_RENAME 0x0080 /* pair */
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#define AA_MAY_SETATTR 0x0100 /* meta write */
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#define AA_MAY_GETATTR 0x0200 /* meta read */
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#define AA_MAY_SETCRED 0x0400 /* security cred/attr */
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#define AA_MAY_GETCRED 0x0800
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#define AA_MAY_CHMOD 0x1000 /* pair */
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#define AA_MAY_CHOWN 0x2000 /* pair */
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#define AA_MAY_CHGRP 0x4000 /* pair */
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#define AA_MAY_LOCK 0x8000 /* LINK_SUBSET overlaid */
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#define AA_EXEC_MMAP 0x00010000
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#define AA_MAY_MPROT 0x00020000 /* extend conditions */
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#define AA_MAY_LINK 0x00040000 /* pair */
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#define AA_MAY_SNAPSHOT 0x00080000 /* pair */
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#define AA_MAY_DELEGATE
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#define AA_CONT_MATCH 0x08000000
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#define AA_MAY_STACK 0x10000000
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#define AA_MAY_ONEXEC 0x20000000 /* either stack or change_profile */
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#define AA_MAY_CHANGE_PROFILE 0x40000000
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#define AA_MAY_CHANGEHAT 0x80000000
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#define AA_LINK_SUBSET AA_MAY_LOCK /* overlaid */
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#define PERMS_CHRS_MASK (MAY_READ | MAY_WRITE | AA_MAY_CREATE | \
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AA_MAY_DELETE | AA_MAY_LINK | AA_MAY_LOCK | \
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AA_MAY_EXEC | AA_EXEC_MMAP | AA_MAY_APPEND)
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#define PERMS_NAMES_MASK (PERMS_CHRS_MASK | AA_MAY_OPEN | AA_MAY_RENAME | \
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AA_MAY_SETATTR | AA_MAY_GETATTR | AA_MAY_SETCRED | \
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AA_MAY_GETCRED | AA_MAY_CHMOD | AA_MAY_CHOWN | \
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AA_MAY_CHGRP | AA_MAY_MPROT | AA_MAY_SNAPSHOT | \
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AA_MAY_STACK | AA_MAY_ONEXEC | \
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AA_MAY_CHANGE_PROFILE | AA_MAY_CHANGEHAT)
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extern const char aa_file_perm_chrs[];
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extern const char *aa_file_perm_names[];
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struct aa_perms {
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u32 allow;
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u32 audit; /* set only when allow is set */
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u32 deny; /* explicit deny, or conflict if allow also set */
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u32 quiet; /* set only when ~allow | deny */
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u32 kill; /* set only when ~allow | deny */
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u32 stop; /* set only when ~allow | deny */
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u32 complain; /* accumulates only used when ~allow & ~deny */
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u32 cond; /* set only when ~allow and ~deny */
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u32 hide; /* set only when ~allow | deny */
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u32 prompt; /* accumulates only used when ~allow & ~deny */
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/* Reserved:
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* u32 subtree; / * set only when allow is set * /
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*/
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u16 xindex;
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};
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#define ALL_PERMS_MASK 0xffffffff
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extern struct aa_perms nullperms;
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extern struct aa_perms allperms;
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#define xcheck(FN1, FN2) \
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({ \
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int e, error = FN1; \
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e = FN2; \
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if (e) \
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error = e; \
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error; \
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})
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/*
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* TODO: update for labels pointing to labels instead of profiles
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* TODO: optimize the walk, currently does subwalk of L2 for each P in L1
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* gah this doesn't allow for label compound check!!!!
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*/
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#define xcheck_ns_profile_profile(P1, P2, FN, args...) \
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({ \
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int ____e = 0; \
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if (P1->ns == P2->ns) \
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____e = FN((P1), (P2), args); \
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(____e); \
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})
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#define xcheck_ns_profile_label(P, L, FN, args...) \
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({ \
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struct aa_profile *__p2; \
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fn_for_each((L), __p2, \
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xcheck_ns_profile_profile((P), __p2, (FN), args)); \
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})
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#define xcheck_ns_labels(L1, L2, FN, args...) \
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({ \
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struct aa_profile *__p1; \
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fn_for_each((L1), __p1, FN(__p1, (L2), args)); \
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})
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/* Do the cross check but applying FN at the profiles level */
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#define xcheck_labels_profiles(L1, L2, FN, args...) \
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xcheck_ns_labels((L1), (L2), xcheck_ns_profile_label, (FN), args)
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#define xcheck_labels(L1, L2, P, FN1, FN2) \
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xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2)))
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void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs,
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u32 mask);
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void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
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u32 mask);
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void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
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u32 chrsmask, const char * const *names, u32 namesmask);
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void aa_apply_modes_to_perms(struct aa_profile *profile,
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struct aa_perms *perms);
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void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
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struct aa_perms *perms);
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void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend);
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void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend);
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void aa_profile_match_label(struct aa_profile *profile, struct aa_label *label,
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int type, u32 request, struct aa_perms *perms);
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int aa_profile_label_perm(struct aa_profile *profile, struct aa_profile *target,
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u32 request, int type, u32 *deny,
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struct common_audit_data *sa);
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int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms,
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u32 request, struct common_audit_data *sa,
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void (*cb)(struct audit_buffer *, void *));
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#endif /* __AA_PERM_H */
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