/* SPDX-License-Identifier: GPL-2.0-only */ /* * AppArmor security module * * This file contains AppArmor basic permission sets definitions. * * Copyright 2017 Canonical Ltd. */ #ifndef __AA_PERM_H #define __AA_PERM_H #include #include "label.h" #define AA_MAY_EXEC MAY_EXEC #define AA_MAY_WRITE MAY_WRITE #define AA_MAY_READ MAY_READ #define AA_MAY_APPEND MAY_APPEND #define AA_MAY_CREATE 0x0010 #define AA_MAY_DELETE 0x0020 #define AA_MAY_OPEN 0x0040 #define AA_MAY_RENAME 0x0080 /* pair */ #define AA_MAY_SETATTR 0x0100 /* meta write */ #define AA_MAY_GETATTR 0x0200 /* meta read */ #define AA_MAY_SETCRED 0x0400 /* security cred/attr */ #define AA_MAY_GETCRED 0x0800 #define AA_MAY_CHMOD 0x1000 /* pair */ #define AA_MAY_CHOWN 0x2000 /* pair */ #define AA_MAY_CHGRP 0x4000 /* pair */ #define AA_MAY_LOCK 0x8000 /* LINK_SUBSET overlaid */ #define AA_EXEC_MMAP 0x00010000 #define AA_MAY_MPROT 0x00020000 /* extend conditions */ #define AA_MAY_LINK 0x00040000 /* pair */ #define AA_MAY_SNAPSHOT 0x00080000 /* pair */ #define AA_MAY_DELEGATE #define AA_CONT_MATCH 0x08000000 #define AA_MAY_STACK 0x10000000 #define AA_MAY_ONEXEC 0x20000000 /* either stack or change_profile */ #define AA_MAY_CHANGE_PROFILE 0x40000000 #define AA_MAY_CHANGEHAT 0x80000000 #define AA_LINK_SUBSET AA_MAY_LOCK /* overlaid */ #define AA_MAY_CREATE_SQPOLL AA_MAY_CREATE #define AA_MAY_OVERRIDE_CRED AA_MAY_APPEND #define AA_URING_PERM_MASK (AA_MAY_OVERRIDE_CRED | AA_MAY_CREATE_SQPOLL) #define PERMS_CHRS_MASK (MAY_READ | MAY_WRITE | AA_MAY_CREATE | \ AA_MAY_DELETE | AA_MAY_LINK | AA_MAY_LOCK | \ AA_MAY_EXEC | AA_EXEC_MMAP | AA_MAY_APPEND) #define PERMS_NAMES_MASK (PERMS_CHRS_MASK | AA_MAY_OPEN | AA_MAY_RENAME | \ AA_MAY_SETATTR | AA_MAY_GETATTR | AA_MAY_SETCRED | \ AA_MAY_GETCRED | AA_MAY_CHMOD | AA_MAY_CHOWN | \ AA_MAY_CHGRP | AA_MAY_MPROT | AA_MAY_SNAPSHOT | \ AA_MAY_STACK | AA_MAY_ONEXEC | \ AA_MAY_CHANGE_PROFILE | AA_MAY_CHANGEHAT) extern const char aa_file_perm_chrs[]; extern const char *aa_file_perm_names[]; struct aa_perms { u32 allow; u32 deny; /* explicit deny, or conflict if allow also set */ u32 subtree; /* allow perm on full subtree only when allow is set */ u32 cond; /* set only when ~allow and ~deny */ u32 kill; /* set only when ~allow | deny */ u32 complain; /* accumulates only used when ~allow & ~deny */ u32 prompt; /* accumulates only used when ~allow & ~deny */ u32 audit; /* set only when allow is set */ u32 quiet; /* set only when ~allow | deny */ u32 hide; /* set only when ~allow | deny */ u32 xindex; u32 tag; /* tag string index, if present */ u32 label; /* label string index, if present */ }; /* * Indexes are broken into a 24 bit index and 8 bit flag. * For the index to be valid there must be a value in the flag */ #define AA_INDEX_MASK 0x00ffffff #define AA_INDEX_FLAG_MASK 0xff000000 #define AA_INDEX_NONE 0 #define ALL_PERMS_MASK 0xffffffff extern struct aa_perms nullperms; extern struct aa_perms allperms; /** * aa_perms_accum_raw - accumulate perms with out masking off overlapping perms * @accum - perms struct to accumulate into * @addend - perms struct to add to @accum */ static inline void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend) { accum->deny |= addend->deny; accum->allow &= addend->allow & ~addend->deny; accum->audit |= addend->audit & addend->allow; accum->quiet &= addend->quiet & ~addend->allow; accum->kill |= addend->kill & ~addend->allow; accum->complain |= addend->complain & ~addend->allow & ~addend->deny; accum->cond |= addend->cond & ~addend->allow & ~addend->deny; accum->hide &= addend->hide & ~addend->allow; accum->prompt |= addend->prompt & ~addend->allow & ~addend->deny; accum->subtree |= addend->subtree & ~addend->deny; if (!accum->xindex) accum->xindex = addend->xindex; if (!accum->tag) accum->tag = addend->tag; if (!accum->label) accum->label = addend->label; } /** * aa_perms_accum - accumulate perms, masking off overlapping perms * @accum - perms struct to accumulate into * @addend - perms struct to add to @accum */ static inline void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend) { accum->deny |= addend->deny; accum->allow &= addend->allow & ~accum->deny; accum->audit |= addend->audit & accum->allow; accum->quiet &= addend->quiet & ~accum->allow; accum->kill |= addend->kill & ~accum->allow; accum->complain |= addend->complain & ~accum->allow & ~accum->deny; accum->cond |= addend->cond & ~accum->allow & ~accum->deny; accum->hide &= addend->hide & ~accum->allow; accum->prompt |= addend->prompt & ~accum->allow & ~accum->deny; accum->subtree &= addend->subtree & ~accum->deny; if (!accum->xindex) accum->xindex = addend->xindex; if (!accum->tag) accum->tag = addend->tag; if (!accum->label) accum->label = addend->label; } #define xcheck(FN1, FN2) \ ({ \ int e, error = FN1; \ e = FN2; \ if (e) \ error = e; \ error; \ }) /* * TODO: update for labels pointing to labels instead of profiles * TODO: optimize the walk, currently does subwalk of L2 for each P in L1 * gah this doesn't allow for label compound check!!!! */ #define xcheck_ns_profile_profile(P1, P2, FN, args...) \ ({ \ int ____e = 0; \ if (P1->ns == P2->ns) \ ____e = FN((P1), (P2), args); \ (____e); \ }) #define xcheck_ns_profile_label(P, L, FN, args...) \ ({ \ struct aa_profile *__p2; \ fn_for_each((L), __p2, \ xcheck_ns_profile_profile((P), __p2, (FN), args)); \ }) #define xcheck_ns_labels(L1, L2, FN, args...) \ ({ \ struct aa_profile *__p1; \ fn_for_each((L1), __p1, FN(__p1, (L2), args)); \ }) /* Do the cross check but applying FN at the profiles level */ #define xcheck_labels_profiles(L1, L2, FN, args...) \ xcheck_ns_labels((L1), (L2), xcheck_ns_profile_label, (FN), args) #define xcheck_labels(L1, L2, P, FN1, FN2) \ xcheck(fn_for_each((L1), (P), (FN1)), fn_for_each((L2), (P), (FN2))) extern struct aa_perms default_perms; void aa_perm_mask_to_str(char *str, size_t str_size, const char *chrs, u32 mask); void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names, u32 mask); void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs, u32 chrsmask, const char * const *names, u32 namesmask); void aa_apply_modes_to_perms(struct aa_profile *profile, struct aa_perms *perms); void aa_perms_accum(struct aa_perms *accum, struct aa_perms *addend); void aa_perms_accum_raw(struct aa_perms *accum, struct aa_perms *addend); void aa_profile_match_label(struct aa_profile *profile, struct aa_ruleset *rules, struct aa_label *label, int type, u32 request, struct aa_perms *perms); int aa_profile_label_perm(struct aa_profile *profile, struct aa_profile *target, u32 request, int type, u32 *deny, struct apparmor_audit_data *ad); int aa_check_perms(struct aa_profile *profile, struct aa_perms *perms, u32 request, struct apparmor_audit_data *ad, void (*cb)(struct audit_buffer *, void *)); #endif /* __AA_PERM_H */