1b886d83cSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 26380bd8dSJohn Johansen /* 36380bd8dSJohn Johansen * AppArmor security module 46380bd8dSJohn Johansen * 56380bd8dSJohn Johansen * This file contains AppArmor file mediation function definitions. 66380bd8dSJohn Johansen * 76380bd8dSJohn Johansen * Copyright (C) 1998-2008 Novell/SUSE 86380bd8dSJohn Johansen * Copyright 2009-2010 Canonical Ltd. 96380bd8dSJohn Johansen */ 106380bd8dSJohn Johansen 116380bd8dSJohn Johansen #ifndef __AA_FILE_H 126380bd8dSJohn Johansen #define __AA_FILE_H 136380bd8dSJohn Johansen 14190a9518SJohn Johansen #include <linux/spinlock.h> 15190a9518SJohn Johansen 166380bd8dSJohn Johansen #include "domain.h" 176380bd8dSJohn Johansen #include "match.h" 18fc7e0b26SJohn Johansen #include "perms.h" 196380bd8dSJohn Johansen 20*53bdc46fSJohn Johansen struct aa_policydb; 216380bd8dSJohn Johansen struct aa_profile; 2237721e1bSAlexey Dobriyan struct path; 236380bd8dSJohn Johansen 24e53cfe6cSJohn Johansen #define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) 256380bd8dSJohn Johansen 266380bd8dSJohn Johansen #define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\ 276380bd8dSJohn Johansen AA_MAY_CREATE | AA_MAY_DELETE | \ 28e53cfe6cSJohn Johansen AA_MAY_GETATTR | AA_MAY_SETATTR | \ 296380bd8dSJohn Johansen AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ 306380bd8dSJohn Johansen AA_EXEC_MMAP | AA_MAY_LINK) 316380bd8dSJohn Johansen 3233bf60caSCasey Schaufler static inline struct aa_file_ctx *file_ctx(struct file *file) 3333bf60caSCasey Schaufler { 3433bf60caSCasey Schaufler return file->f_security + apparmor_blob_sizes.lbs_file; 3533bf60caSCasey Schaufler } 362835a13bSJohn Johansen 37af7caa8fSJohn Johansen /* struct aa_file_ctx - the AppArmor context the file was opened in 38190a9518SJohn Johansen * @lock: lock to update the ctx 39190a9518SJohn Johansen * @label: label currently cached on the ctx 40af7caa8fSJohn Johansen * @perms: the permission the file was opened with 41af7caa8fSJohn Johansen */ 42af7caa8fSJohn Johansen struct aa_file_ctx { 43190a9518SJohn Johansen spinlock_t lock; 44190a9518SJohn Johansen struct aa_label __rcu *label; 45e53cfe6cSJohn Johansen u32 allow; 46af7caa8fSJohn Johansen }; 47af7caa8fSJohn Johansen 48af7caa8fSJohn Johansen /** 492835a13bSJohn Johansen * aa_alloc_file_ctx - allocate file_ctx 502835a13bSJohn Johansen * @label: initial label of task creating the file 51af7caa8fSJohn Johansen * @gfp: gfp flags for allocation 52af7caa8fSJohn Johansen * 53af7caa8fSJohn Johansen * Returns: file_ctx or NULL on failure 54af7caa8fSJohn Johansen */ 55190a9518SJohn Johansen static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label, 56190a9518SJohn Johansen gfp_t gfp) 57af7caa8fSJohn Johansen { 582835a13bSJohn Johansen struct aa_file_ctx *ctx; 592835a13bSJohn Johansen 602835a13bSJohn Johansen ctx = kzalloc(sizeof(struct aa_file_ctx), gfp); 61190a9518SJohn Johansen if (ctx) { 62190a9518SJohn Johansen spin_lock_init(&ctx->lock); 63190a9518SJohn Johansen rcu_assign_pointer(ctx->label, aa_get_label(label)); 64190a9518SJohn Johansen } 652835a13bSJohn Johansen return ctx; 66af7caa8fSJohn Johansen } 67af7caa8fSJohn Johansen 68af7caa8fSJohn Johansen /** 692835a13bSJohn Johansen * aa_free_file_ctx - free a file_ctx 70af7caa8fSJohn Johansen * @ctx: file_ctx to free (MAYBE_NULL) 71af7caa8fSJohn Johansen */ 722835a13bSJohn Johansen static inline void aa_free_file_ctx(struct aa_file_ctx *ctx) 73af7caa8fSJohn Johansen { 74190a9518SJohn Johansen if (ctx) { 75190a9518SJohn Johansen aa_put_label(rcu_access_pointer(ctx->label)); 76453431a5SWaiman Long kfree_sensitive(ctx); 77af7caa8fSJohn Johansen } 78190a9518SJohn Johansen } 79190a9518SJohn Johansen 80190a9518SJohn Johansen static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx) 81190a9518SJohn Johansen { 82190a9518SJohn Johansen return aa_get_label_rcu(&ctx->label); 83190a9518SJohn Johansen } 84af7caa8fSJohn Johansen 856380bd8dSJohn Johansen /* 866380bd8dSJohn Johansen * The xindex is broken into 3 parts 876380bd8dSJohn Johansen * - index - an index into either the exec name table or the variable table 886380bd8dSJohn Johansen * - exec type - which determines how the executable name and index are used 896380bd8dSJohn Johansen * - flags - which modify how the destination name is applied 906380bd8dSJohn Johansen */ 916380bd8dSJohn Johansen #define AA_X_INDEX_MASK 0x03ff 926380bd8dSJohn Johansen 936380bd8dSJohn Johansen #define AA_X_TYPE_MASK 0x0c00 946380bd8dSJohn Johansen #define AA_X_TYPE_SHIFT 10 956380bd8dSJohn Johansen #define AA_X_NONE 0x0000 966380bd8dSJohn Johansen #define AA_X_NAME 0x0400 /* use executable name px */ 976380bd8dSJohn Johansen #define AA_X_TABLE 0x0800 /* use a specified name ->n# */ 986380bd8dSJohn Johansen 996380bd8dSJohn Johansen #define AA_X_UNSAFE 0x1000 1006380bd8dSJohn Johansen #define AA_X_CHILD 0x2000 /* make >AA_X_NONE apply to children */ 1016380bd8dSJohn Johansen #define AA_X_INHERIT 0x4000 1026380bd8dSJohn Johansen #define AA_X_UNCONFINED 0x8000 1036380bd8dSJohn Johansen 1046380bd8dSJohn Johansen /* need to make conditional which ones are being set */ 1056380bd8dSJohn Johansen struct path_cond { 1062db81452SEric W. Biederman kuid_t uid; 1076380bd8dSJohn Johansen umode_t mode; 1086380bd8dSJohn Johansen }; 1096380bd8dSJohn Johansen 1106380bd8dSJohn Johansen #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) 1116380bd8dSJohn Johansen 1126380bd8dSJohn Johansen /* FIXME: split perms from dfa and match this to description 1136380bd8dSJohn Johansen * also add delegation info. 1146380bd8dSJohn Johansen */ 1156380bd8dSJohn Johansen static inline u16 dfa_map_xindex(u16 mask) 1166380bd8dSJohn Johansen { 1176380bd8dSJohn Johansen u16 old_index = (mask >> 10) & 0xf; 1186380bd8dSJohn Johansen u16 index = 0; 1196380bd8dSJohn Johansen 1206380bd8dSJohn Johansen if (mask & 0x100) 1216380bd8dSJohn Johansen index |= AA_X_UNSAFE; 1226380bd8dSJohn Johansen if (mask & 0x200) 1236380bd8dSJohn Johansen index |= AA_X_INHERIT; 1246380bd8dSJohn Johansen if (mask & 0x80) 1256380bd8dSJohn Johansen index |= AA_X_UNCONFINED; 1266380bd8dSJohn Johansen 1276380bd8dSJohn Johansen if (old_index == 1) { 1286380bd8dSJohn Johansen index |= AA_X_UNCONFINED; 1296380bd8dSJohn Johansen } else if (old_index == 2) { 1306380bd8dSJohn Johansen index |= AA_X_NAME; 1316380bd8dSJohn Johansen } else if (old_index == 3) { 1326380bd8dSJohn Johansen index |= AA_X_NAME | AA_X_CHILD; 1338b964eaeSJohn Johansen } else if (old_index) { 1346380bd8dSJohn Johansen index |= AA_X_TABLE; 1356380bd8dSJohn Johansen index |= old_index - 4; 1366380bd8dSJohn Johansen } 1376380bd8dSJohn Johansen 1386380bd8dSJohn Johansen return index; 1396380bd8dSJohn Johansen } 1406380bd8dSJohn Johansen 1416380bd8dSJohn Johansen /* 1426380bd8dSJohn Johansen * map old dfa inline permissions to new format 1436380bd8dSJohn Johansen */ 1446380bd8dSJohn Johansen #define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \ 1456380bd8dSJohn Johansen ((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) 146f567e7faSJohn Johansen #define dfa_user_xbits(dfa, state) (((ACCEPT_TABLE(dfa)[state]) >> 7) & 0x7f) 1476380bd8dSJohn Johansen #define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f) 1486380bd8dSJohn Johansen #define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f) 1496380bd8dSJohn Johansen #define dfa_user_xindex(dfa, state) \ 1506380bd8dSJohn Johansen (dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff)) 1516380bd8dSJohn Johansen 1526380bd8dSJohn Johansen #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \ 1536380bd8dSJohn Johansen 0x7f) | \ 1546380bd8dSJohn Johansen ((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) 155f567e7faSJohn Johansen #define dfa_other_xbits(dfa, state) \ 156f567e7faSJohn Johansen ((((ACCEPT_TABLE(dfa)[state]) >> 7) >> 14) & 0x7f) 1576380bd8dSJohn Johansen #define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f) 1586380bd8dSJohn Johansen #define dfa_other_quiet(dfa, state) \ 1596380bd8dSJohn Johansen ((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f) 1606380bd8dSJohn Johansen #define dfa_other_xindex(dfa, state) \ 1616380bd8dSJohn Johansen dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff) 1626380bd8dSJohn Johansen 1632d679f3cSJohn Johansen int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms, 164ef88a7acSJohn Johansen const char *op, u32 request, const char *name, 16598c3d182SJohn Johansen const char *target, struct aa_label *tlabel, kuid_t ouid, 16698c3d182SJohn Johansen const char *info, int error); 1676380bd8dSJohn Johansen 168*53bdc46fSJohn Johansen struct aa_perms *aa_lookup_fperms(struct aa_policydb *file_rules, 169408d53e9SMike Salvatore unsigned int state, struct path_cond *cond); 170*53bdc46fSJohn Johansen unsigned int aa_str_perms(struct aa_policydb *file_rules, unsigned int start, 1716380bd8dSJohn Johansen const char *name, struct path_cond *cond, 1722d679f3cSJohn Johansen struct aa_perms *perms); 1736380bd8dSJohn Johansen 174aebd873eSJohn Johansen int __aa_path_perm(const char *op, struct aa_profile *profile, 175aebd873eSJohn Johansen const char *name, u32 request, struct path_cond *cond, 176aebd873eSJohn Johansen int flags, struct aa_perms *perms); 177aebd873eSJohn Johansen int aa_path_perm(const char *op, struct aa_label *label, 17847f6e5ccSJohn Johansen const struct path *path, int flags, u32 request, 17947f6e5ccSJohn Johansen struct path_cond *cond); 1806380bd8dSJohn Johansen 1818014370fSJohn Johansen int aa_path_link(struct aa_label *label, struct dentry *old_dentry, 1823539aaf6SAl Viro const struct path *new_dir, struct dentry *new_dentry); 1836380bd8dSJohn Johansen 184190a9518SJohn Johansen int aa_file_perm(const char *op, struct aa_label *label, struct file *file, 185341c1fdaSJohn Johansen u32 request, bool in_atomic); 1866380bd8dSJohn Johansen 187192ca6b5SJohn Johansen void aa_inherit_files(const struct cred *cred, struct files_struct *files); 188192ca6b5SJohn Johansen 1896380bd8dSJohn Johansen 1906380bd8dSJohn Johansen /** 1916380bd8dSJohn Johansen * aa_map_file_perms - map file flags to AppArmor permissions 1926380bd8dSJohn Johansen * @file: open file to map flags to AppArmor permissions 1936380bd8dSJohn Johansen * 1946380bd8dSJohn Johansen * Returns: apparmor permission set for the file 1956380bd8dSJohn Johansen */ 1966380bd8dSJohn Johansen static inline u32 aa_map_file_to_perms(struct file *file) 1976380bd8dSJohn Johansen { 19853fe8b99SJohn Johansen int flags = file->f_flags; 19953fe8b99SJohn Johansen u32 perms = 0; 20053fe8b99SJohn Johansen 20153fe8b99SJohn Johansen if (file->f_mode & FMODE_WRITE) 20253fe8b99SJohn Johansen perms |= MAY_WRITE; 20353fe8b99SJohn Johansen if (file->f_mode & FMODE_READ) 20453fe8b99SJohn Johansen perms |= MAY_READ; 2056380bd8dSJohn Johansen 2066380bd8dSJohn Johansen if ((flags & O_APPEND) && (perms & MAY_WRITE)) 2076380bd8dSJohn Johansen perms = (perms & ~MAY_WRITE) | MAY_APPEND; 2086380bd8dSJohn Johansen /* trunc implies write permission */ 2096380bd8dSJohn Johansen if (flags & O_TRUNC) 2106380bd8dSJohn Johansen perms |= MAY_WRITE; 2116380bd8dSJohn Johansen if (flags & O_CREAT) 2126380bd8dSJohn Johansen perms |= AA_MAY_CREATE; 2136380bd8dSJohn Johansen 2146380bd8dSJohn Johansen return perms; 2156380bd8dSJohn Johansen } 2166380bd8dSJohn Johansen 2176380bd8dSJohn Johansen #endif /* __AA_FILE_H */ 218