16380bd8dSJohn Johansen /* 26380bd8dSJohn Johansen * AppArmor security module 36380bd8dSJohn Johansen * 46380bd8dSJohn Johansen * This file contains AppArmor file mediation function definitions. 56380bd8dSJohn Johansen * 66380bd8dSJohn Johansen * Copyright (C) 1998-2008 Novell/SUSE 76380bd8dSJohn Johansen * Copyright 2009-2010 Canonical Ltd. 86380bd8dSJohn Johansen * 96380bd8dSJohn Johansen * This program is free software; you can redistribute it and/or 106380bd8dSJohn Johansen * modify it under the terms of the GNU General Public License as 116380bd8dSJohn Johansen * published by the Free Software Foundation, version 2 of the 126380bd8dSJohn Johansen * License. 136380bd8dSJohn Johansen */ 146380bd8dSJohn Johansen 156380bd8dSJohn Johansen #ifndef __AA_FILE_H 166380bd8dSJohn Johansen #define __AA_FILE_H 176380bd8dSJohn Johansen 18190a9518SJohn Johansen #include <linux/spinlock.h> 19190a9518SJohn Johansen 206380bd8dSJohn Johansen #include "domain.h" 216380bd8dSJohn Johansen #include "match.h" 22fc7e0b26SJohn Johansen #include "perms.h" 236380bd8dSJohn Johansen 246380bd8dSJohn Johansen struct aa_profile; 2537721e1bSAlexey Dobriyan struct path; 266380bd8dSJohn Johansen 27e53cfe6cSJohn Johansen #define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) 286380bd8dSJohn Johansen 296380bd8dSJohn Johansen #define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\ 306380bd8dSJohn Johansen AA_MAY_CREATE | AA_MAY_DELETE | \ 31e53cfe6cSJohn Johansen AA_MAY_GETATTR | AA_MAY_SETATTR | \ 326380bd8dSJohn Johansen AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ 336380bd8dSJohn Johansen AA_EXEC_MMAP | AA_MAY_LINK) 346380bd8dSJohn Johansen 352835a13bSJohn Johansen #define file_ctx(X) ((struct aa_file_ctx *)(X)->f_security) 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)); 76af7caa8fSJohn Johansen kzfree(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 /* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */ 1056380bd8dSJohn Johansen #define AA_SECURE_X_NEEDED 0x8000 1066380bd8dSJohn Johansen 1076380bd8dSJohn Johansen /* need to make conditional which ones are being set */ 1086380bd8dSJohn Johansen struct path_cond { 1092db81452SEric W. Biederman kuid_t uid; 1106380bd8dSJohn Johansen umode_t mode; 1116380bd8dSJohn Johansen }; 1126380bd8dSJohn Johansen 1136380bd8dSJohn Johansen #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) 1146380bd8dSJohn Johansen 1156380bd8dSJohn Johansen /* FIXME: split perms from dfa and match this to description 1166380bd8dSJohn Johansen * also add delegation info. 1176380bd8dSJohn Johansen */ 1186380bd8dSJohn Johansen static inline u16 dfa_map_xindex(u16 mask) 1196380bd8dSJohn Johansen { 1206380bd8dSJohn Johansen u16 old_index = (mask >> 10) & 0xf; 1216380bd8dSJohn Johansen u16 index = 0; 1226380bd8dSJohn Johansen 1236380bd8dSJohn Johansen if (mask & 0x100) 1246380bd8dSJohn Johansen index |= AA_X_UNSAFE; 1256380bd8dSJohn Johansen if (mask & 0x200) 1266380bd8dSJohn Johansen index |= AA_X_INHERIT; 1276380bd8dSJohn Johansen if (mask & 0x80) 1286380bd8dSJohn Johansen index |= AA_X_UNCONFINED; 1296380bd8dSJohn Johansen 1306380bd8dSJohn Johansen if (old_index == 1) { 1316380bd8dSJohn Johansen index |= AA_X_UNCONFINED; 1326380bd8dSJohn Johansen } else if (old_index == 2) { 1336380bd8dSJohn Johansen index |= AA_X_NAME; 1346380bd8dSJohn Johansen } else if (old_index == 3) { 1356380bd8dSJohn Johansen index |= AA_X_NAME | AA_X_CHILD; 1368b964eaeSJohn Johansen } else if (old_index) { 1376380bd8dSJohn Johansen index |= AA_X_TABLE; 1386380bd8dSJohn Johansen index |= old_index - 4; 1396380bd8dSJohn Johansen } 1406380bd8dSJohn Johansen 1416380bd8dSJohn Johansen return index; 1426380bd8dSJohn Johansen } 1436380bd8dSJohn Johansen 1446380bd8dSJohn Johansen /* 1456380bd8dSJohn Johansen * map old dfa inline permissions to new format 1466380bd8dSJohn Johansen */ 1476380bd8dSJohn Johansen #define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \ 1486380bd8dSJohn Johansen ((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) 1496380bd8dSJohn Johansen #define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f) 1506380bd8dSJohn Johansen #define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f) 1516380bd8dSJohn Johansen #define dfa_user_xindex(dfa, state) \ 1526380bd8dSJohn Johansen (dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff)) 1536380bd8dSJohn Johansen 1546380bd8dSJohn Johansen #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \ 1556380bd8dSJohn Johansen 0x7f) | \ 1566380bd8dSJohn Johansen ((ACCEPT_TABLE(dfa)[state]) & 0x80000000)) 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, 1652db81452SEric W. Biederman const char *target, kuid_t ouid, const char *info, int error); 1666380bd8dSJohn Johansen 1676380bd8dSJohn Johansen /** 1686380bd8dSJohn Johansen * struct aa_file_rules - components used for file rule permissions 1696380bd8dSJohn Johansen * @dfa: dfa to match path names and conditionals against 1706380bd8dSJohn Johansen * @perms: permission table indexed by the matched state accept entry of @dfa 1716380bd8dSJohn Johansen * @trans: transition table for indexed by named x transitions 1726380bd8dSJohn Johansen * 1736380bd8dSJohn Johansen * File permission are determined by matching a path against @dfa and then 1746380bd8dSJohn Johansen * then using the value of the accept entry for the matching state as 1756380bd8dSJohn Johansen * an index into @perms. If a named exec transition is required it is 1766380bd8dSJohn Johansen * looked up in the transition table. 1776380bd8dSJohn Johansen */ 1786380bd8dSJohn Johansen struct aa_file_rules { 1796380bd8dSJohn Johansen unsigned int start; 1806380bd8dSJohn Johansen struct aa_dfa *dfa; 1816380bd8dSJohn Johansen /* struct perms perms; */ 1826380bd8dSJohn Johansen struct aa_domain trans; 1836380bd8dSJohn Johansen /* TODO: add delegate table */ 1846380bd8dSJohn Johansen }; 1856380bd8dSJohn Johansen 1862d679f3cSJohn Johansen struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state, 1872d679f3cSJohn Johansen struct path_cond *cond); 1886380bd8dSJohn Johansen unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start, 1896380bd8dSJohn Johansen const char *name, struct path_cond *cond, 1902d679f3cSJohn Johansen struct aa_perms *perms); 1916380bd8dSJohn Johansen 19247f6e5ccSJohn Johansen int aa_path_perm(const char *op, struct aa_profile *profile, 19347f6e5ccSJohn Johansen const struct path *path, int flags, u32 request, 19447f6e5ccSJohn Johansen struct path_cond *cond); 1956380bd8dSJohn Johansen 1966380bd8dSJohn Johansen int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry, 1973539aaf6SAl Viro const struct path *new_dir, struct dentry *new_dentry); 1986380bd8dSJohn Johansen 199190a9518SJohn Johansen int aa_file_perm(const char *op, struct aa_label *label, struct file *file, 2006380bd8dSJohn Johansen u32 request); 2016380bd8dSJohn Johansen 202192ca6b5SJohn Johansen void aa_inherit_files(const struct cred *cred, struct files_struct *files); 203192ca6b5SJohn Johansen 2046380bd8dSJohn Johansen static inline void aa_free_file_rules(struct aa_file_rules *rules) 2056380bd8dSJohn Johansen { 2066380bd8dSJohn Johansen aa_put_dfa(rules->dfa); 2076380bd8dSJohn Johansen aa_free_domain_entries(&rules->trans); 2086380bd8dSJohn Johansen } 2096380bd8dSJohn Johansen 2106380bd8dSJohn Johansen /** 2116380bd8dSJohn Johansen * aa_map_file_perms - map file flags to AppArmor permissions 2126380bd8dSJohn Johansen * @file: open file to map flags to AppArmor permissions 2136380bd8dSJohn Johansen * 2146380bd8dSJohn Johansen * Returns: apparmor permission set for the file 2156380bd8dSJohn Johansen */ 2166380bd8dSJohn Johansen static inline u32 aa_map_file_to_perms(struct file *file) 2176380bd8dSJohn Johansen { 21853fe8b99SJohn Johansen int flags = file->f_flags; 21953fe8b99SJohn Johansen u32 perms = 0; 22053fe8b99SJohn Johansen 22153fe8b99SJohn Johansen if (file->f_mode & FMODE_WRITE) 22253fe8b99SJohn Johansen perms |= MAY_WRITE; 22353fe8b99SJohn Johansen if (file->f_mode & FMODE_READ) 22453fe8b99SJohn Johansen perms |= MAY_READ; 2256380bd8dSJohn Johansen 2266380bd8dSJohn Johansen if ((flags & O_APPEND) && (perms & MAY_WRITE)) 2276380bd8dSJohn Johansen perms = (perms & ~MAY_WRITE) | MAY_APPEND; 2286380bd8dSJohn Johansen /* trunc implies write permission */ 2296380bd8dSJohn Johansen if (flags & O_TRUNC) 2306380bd8dSJohn Johansen perms |= MAY_WRITE; 2316380bd8dSJohn Johansen if (flags & O_CREAT) 2326380bd8dSJohn Johansen perms |= AA_MAY_CREATE; 2336380bd8dSJohn Johansen 2346380bd8dSJohn Johansen return perms; 2356380bd8dSJohn Johansen } 2366380bd8dSJohn Johansen 2376380bd8dSJohn Johansen #endif /* __AA_FILE_H */ 238