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240 lines
6.8 KiB
240 lines
6.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* AppArmor security module |
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* |
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* This file contains AppArmor file mediation function definitions. |
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* |
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* Copyright (C) 1998-2008 Novell/SUSE |
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* Copyright 2009-2010 Canonical Ltd. |
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*/ |
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#ifndef __AA_FILE_H |
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#define __AA_FILE_H |
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#include <linux/spinlock.h> |
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#include "domain.h" |
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#include "match.h" |
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#include "perms.h" |
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struct aa_profile; |
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struct path; |
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#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) |
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#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\ |
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AA_MAY_CREATE | AA_MAY_DELETE | \ |
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AA_MAY_GETATTR | AA_MAY_SETATTR | \ |
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AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ |
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AA_EXEC_MMAP | AA_MAY_LINK) |
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static inline struct aa_file_ctx *file_ctx(struct file *file) |
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{ |
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return file->f_security + apparmor_blob_sizes.lbs_file; |
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} |
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/* struct aa_file_ctx - the AppArmor context the file was opened in |
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* @lock: lock to update the ctx |
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* @label: label currently cached on the ctx |
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* @perms: the permission the file was opened with |
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*/ |
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struct aa_file_ctx { |
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spinlock_t lock; |
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struct aa_label __rcu *label; |
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u32 allow; |
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}; |
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/** |
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* aa_alloc_file_ctx - allocate file_ctx |
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* @label: initial label of task creating the file |
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* @gfp: gfp flags for allocation |
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* |
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* Returns: file_ctx or NULL on failure |
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*/ |
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static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label, |
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gfp_t gfp) |
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{ |
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struct aa_file_ctx *ctx; |
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ctx = kzalloc(sizeof(struct aa_file_ctx), gfp); |
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if (ctx) { |
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spin_lock_init(&ctx->lock); |
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rcu_assign_pointer(ctx->label, aa_get_label(label)); |
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} |
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return ctx; |
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} |
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/** |
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* aa_free_file_ctx - free a file_ctx |
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* @ctx: file_ctx to free (MAYBE_NULL) |
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*/ |
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static inline void aa_free_file_ctx(struct aa_file_ctx *ctx) |
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{ |
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if (ctx) { |
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aa_put_label(rcu_access_pointer(ctx->label)); |
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kfree_sensitive(ctx); |
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} |
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} |
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static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx) |
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{ |
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return aa_get_label_rcu(&ctx->label); |
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} |
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/* |
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* The xindex is broken into 3 parts |
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* - index - an index into either the exec name table or the variable table |
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* - exec type - which determines how the executable name and index are used |
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* - flags - which modify how the destination name is applied |
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*/ |
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#define AA_X_INDEX_MASK 0x03ff |
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#define AA_X_TYPE_MASK 0x0c00 |
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#define AA_X_TYPE_SHIFT 10 |
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#define AA_X_NONE 0x0000 |
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#define AA_X_NAME 0x0400 /* use executable name px */ |
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#define AA_X_TABLE 0x0800 /* use a specified name ->n# */ |
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#define AA_X_UNSAFE 0x1000 |
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#define AA_X_CHILD 0x2000 /* make >AA_X_NONE apply to children */ |
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#define AA_X_INHERIT 0x4000 |
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#define AA_X_UNCONFINED 0x8000 |
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/* need to make conditional which ones are being set */ |
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struct path_cond { |
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kuid_t uid; |
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umode_t mode; |
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}; |
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#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) |
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/* FIXME: split perms from dfa and match this to description |
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* also add delegation info. |
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*/ |
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static inline u16 dfa_map_xindex(u16 mask) |
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{ |
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u16 old_index = (mask >> 10) & 0xf; |
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u16 index = 0; |
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if (mask & 0x100) |
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index |= AA_X_UNSAFE; |
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if (mask & 0x200) |
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index |= AA_X_INHERIT; |
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if (mask & 0x80) |
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index |= AA_X_UNCONFINED; |
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if (old_index == 1) { |
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index |= AA_X_UNCONFINED; |
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} else if (old_index == 2) { |
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index |= AA_X_NAME; |
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} else if (old_index == 3) { |
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index |= AA_X_NAME | AA_X_CHILD; |
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} else if (old_index) { |
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index |= AA_X_TABLE; |
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index |= old_index - 4; |
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} |
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return index; |
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} |
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/* |
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* map old dfa inline permissions to new format |
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*/ |
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#define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \ |
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((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) |
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#define dfa_user_xbits(dfa, state) (((ACCEPT_TABLE(dfa)[state]) >> 7) & 0x7f) |
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#define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f) |
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#define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f) |
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#define dfa_user_xindex(dfa, state) \ |
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(dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff)) |
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#define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \ |
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0x7f) | \ |
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((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) |
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#define dfa_other_xbits(dfa, state) \ |
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((((ACCEPT_TABLE(dfa)[state]) >> 7) >> 14) & 0x7f) |
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#define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f) |
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#define dfa_other_quiet(dfa, state) \ |
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((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f) |
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#define dfa_other_xindex(dfa, state) \ |
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dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff) |
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int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms, |
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const char *op, u32 request, const char *name, |
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const char *target, struct aa_label *tlabel, kuid_t ouid, |
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const char *info, int error); |
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/** |
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* struct aa_file_rules - components used for file rule permissions |
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* @dfa: dfa to match path names and conditionals against |
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* @perms: permission table indexed by the matched state accept entry of @dfa |
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* @trans: transition table for indexed by named x transitions |
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* |
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* File permission are determined by matching a path against @dfa and |
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* then using the value of the accept entry for the matching state as |
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* an index into @perms. If a named exec transition is required it is |
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* looked up in the transition table. |
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*/ |
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struct aa_file_rules { |
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unsigned int start; |
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struct aa_dfa *dfa; |
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/* struct perms perms; */ |
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struct aa_domain trans; |
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/* TODO: add delegate table */ |
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}; |
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struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state, |
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struct path_cond *cond); |
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unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start, |
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const char *name, struct path_cond *cond, |
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struct aa_perms *perms); |
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int __aa_path_perm(const char *op, struct aa_profile *profile, |
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const char *name, u32 request, struct path_cond *cond, |
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int flags, struct aa_perms *perms); |
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int aa_path_perm(const char *op, struct aa_label *label, |
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const struct path *path, int flags, u32 request, |
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struct path_cond *cond); |
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int aa_path_link(struct aa_label *label, struct dentry *old_dentry, |
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const struct path *new_dir, struct dentry *new_dentry); |
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int aa_file_perm(const char *op, struct aa_label *label, struct file *file, |
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u32 request, bool in_atomic); |
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void aa_inherit_files(const struct cred *cred, struct files_struct *files); |
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static inline void aa_free_file_rules(struct aa_file_rules *rules) |
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{ |
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aa_put_dfa(rules->dfa); |
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aa_free_domain_entries(&rules->trans); |
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} |
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/** |
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* aa_map_file_perms - map file flags to AppArmor permissions |
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* @file: open file to map flags to AppArmor permissions |
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* |
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* Returns: apparmor permission set for the file |
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*/ |
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static inline u32 aa_map_file_to_perms(struct file *file) |
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{ |
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int flags = file->f_flags; |
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u32 perms = 0; |
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if (file->f_mode & FMODE_WRITE) |
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perms |= MAY_WRITE; |
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if (file->f_mode & FMODE_READ) |
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perms |= MAY_READ; |
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if ((flags & O_APPEND) && (perms & MAY_WRITE)) |
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perms = (perms & ~MAY_WRITE) | MAY_APPEND; |
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/* trunc implies write permission */ |
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if (flags & O_TRUNC) |
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perms |= MAY_WRITE; |
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if (flags & O_CREAT) |
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perms |= AA_MAY_CREATE; |
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return perms; |
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} |
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#endif /* __AA_FILE_H */
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