1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AppArmor security module 4 * 5 * This file contains AppArmor file mediation function definitions. 6 * 7 * Copyright (C) 1998-2008 Novell/SUSE 8 * Copyright 2009-2010 Canonical Ltd. 9 */ 10 11 #ifndef __AA_FILE_H 12 #define __AA_FILE_H 13 14 #include <linux/spinlock.h> 15 16 #include "domain.h" 17 #include "match.h" 18 #include "perms.h" 19 20 struct aa_policydb; 21 struct aa_profile; 22 struct path; 23 24 #define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) 25 26 #define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\ 27 AA_MAY_CREATE | AA_MAY_DELETE | \ 28 AA_MAY_GETATTR | AA_MAY_SETATTR | \ 29 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ 30 AA_EXEC_MMAP | AA_MAY_LINK) 31 32 static inline struct aa_file_ctx *file_ctx(struct file *file) 33 { 34 return file->f_security + apparmor_blob_sizes.lbs_file; 35 } 36 37 /* struct aa_file_ctx - the AppArmor context the file was opened in 38 * @lock: lock to update the ctx 39 * @label: label currently cached on the ctx 40 * @perms: the permission the file was opened with 41 */ 42 struct aa_file_ctx { 43 spinlock_t lock; 44 struct aa_label __rcu *label; 45 u32 allow; 46 }; 47 48 /* 49 * The xindex is broken into 3 parts 50 * - index - an index into either the exec name table or the variable table 51 * - exec type - which determines how the executable name and index are used 52 * - flags - which modify how the destination name is applied 53 */ 54 #define AA_X_INDEX_MASK AA_INDEX_MASK 55 56 #define AA_X_TYPE_MASK 0x0c000000 57 #define AA_X_NONE AA_INDEX_NONE 58 #define AA_X_NAME 0x04000000 /* use executable name px */ 59 #define AA_X_TABLE 0x08000000 /* use a specified name ->n# */ 60 61 #define AA_X_UNSAFE 0x10000000 62 #define AA_X_CHILD 0x20000000 63 #define AA_X_INHERIT 0x40000000 64 #define AA_X_UNCONFINED 0x80000000 65 66 /* need to make conditional which ones are being set */ 67 struct path_cond { 68 kuid_t uid; 69 umode_t mode; 70 }; 71 72 #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) 73 74 int aa_audit_file(const struct cred *cred, 75 struct aa_profile *profile, struct aa_perms *perms, 76 const char *op, u32 request, const char *name, 77 const char *target, struct aa_label *tlabel, kuid_t ouid, 78 const char *info, int error); 79 80 struct aa_perms *aa_lookup_fperms(struct aa_policydb *file_rules, 81 aa_state_t state, struct path_cond *cond); 82 aa_state_t aa_str_perms(struct aa_policydb *file_rules, aa_state_t start, 83 const char *name, struct path_cond *cond, 84 struct aa_perms *perms); 85 86 int aa_path_perm(const char *op, const struct cred *subj_cred, 87 struct aa_label *label, const struct path *path, 88 int flags, u32 request, struct path_cond *cond); 89 90 int aa_path_link(const struct cred *subj_cred, struct aa_label *label, 91 struct dentry *old_dentry, const struct path *new_dir, 92 struct dentry *new_dentry); 93 94 int aa_file_perm(const char *op, const struct cred *subj_cred, 95 struct aa_label *label, struct file *file, 96 u32 request, bool in_atomic); 97 98 void aa_inherit_files(const struct cred *cred, struct files_struct *files); 99 100 101 /** 102 * aa_map_file_perms - map file flags to AppArmor permissions 103 * @file: open file to map flags to AppArmor permissions 104 * 105 * Returns: apparmor permission set for the file 106 */ 107 static inline u32 aa_map_file_to_perms(struct file *file) 108 { 109 int flags = file->f_flags; 110 u32 perms = 0; 111 112 if (file->f_mode & FMODE_WRITE) 113 perms |= MAY_WRITE; 114 if (file->f_mode & FMODE_READ) 115 perms |= MAY_READ; 116 117 if ((flags & O_APPEND) && (perms & MAY_WRITE)) 118 perms = (perms & ~MAY_WRITE) | MAY_APPEND; 119 /* trunc implies write permission */ 120 if (flags & O_TRUNC) 121 perms |= MAY_WRITE; 122 if (flags & O_CREAT) 123 perms |= AA_MAY_CREATE; 124 125 return perms; 126 } 127 128 #endif /* __AA_FILE_H */ 129