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Diffstat (limited to 'security/apparmor/include/file.h')
| -rw-r--r-- | security/apparmor/include/file.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h new file mode 100644 index 000000000..64dc6d1a7 --- /dev/null +++ b/security/apparmor/include/file.h @@ -0,0 +1,165 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * AppArmor security module + * + * This file contains AppArmor file mediation function definitions. + * + * Copyright (C) 1998-2008 Novell/SUSE + * Copyright 2009-2010 Canonical Ltd. + */ + +#ifndef __AA_FILE_H +#define __AA_FILE_H + +#include <linux/spinlock.h> + +#include "domain.h" +#include "match.h" +#include "perms.h" + +struct aa_policydb; +struct aa_profile; +struct path; + +#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND)) + +#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\ + AA_MAY_CREATE | AA_MAY_DELETE | \ + AA_MAY_GETATTR | AA_MAY_SETATTR | \ + AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ + AA_EXEC_MMAP | AA_MAY_LINK) + +static inline struct aa_file_ctx *file_ctx(struct file *file) +{ + return file->f_security + apparmor_blob_sizes.lbs_file; +} + +/* struct aa_file_ctx - the AppArmor context the file was opened in + * @lock: lock to update the ctx + * @label: label currently cached on the ctx + * @perms: the permission the file was opened with + */ +struct aa_file_ctx { + spinlock_t lock; + struct aa_label __rcu *label; + u32 allow; +}; + +/** + * aa_alloc_file_ctx - allocate file_ctx + * @label: initial label of task creating the file + * @gfp: gfp flags for allocation + * + * Returns: file_ctx or NULL on failure + */ +static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label, + gfp_t gfp) +{ + struct aa_file_ctx *ctx; + + ctx = kzalloc(sizeof(struct aa_file_ctx), gfp); + if (ctx) { + spin_lock_init(&ctx->lock); + rcu_assign_pointer(ctx->label, aa_get_label(label)); + } + return ctx; +} + +/** + * aa_free_file_ctx - free a file_ctx + * @ctx: file_ctx to free (MAYBE_NULL) + */ +static inline void aa_free_file_ctx(struct aa_file_ctx *ctx) +{ + if (ctx) { + aa_put_label(rcu_access_pointer(ctx->label)); + kfree_sensitive(ctx); + } +} + +static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx) +{ + return aa_get_label_rcu(&ctx->label); +} + +/* + * The xindex is broken into 3 parts + * - index - an index into either the exec name table or the variable table + * - exec type - which determines how the executable name and index are used + * - flags - which modify how the destination name is applied + */ +#define AA_X_INDEX_MASK AA_INDEX_MASK + +#define AA_X_TYPE_MASK 0x0c000000 +#define AA_X_NONE AA_INDEX_NONE +#define AA_X_NAME 0x04000000 /* use executable name px */ +#define AA_X_TABLE 0x08000000 /* use a specified name ->n# */ + +#define AA_X_UNSAFE 0x10000000 +#define AA_X_CHILD 0x20000000 +#define AA_X_INHERIT 0x40000000 +#define AA_X_UNCONFINED 0x80000000 + +/* need to make conditional which ones are being set */ +struct path_cond { + kuid_t uid; + umode_t mode; +}; + +#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill) + +int aa_audit_file(const struct cred *cred, + struct aa_profile *profile, struct aa_perms *perms, + const char *op, u32 request, const char *name, + const char *target, struct aa_label *tlabel, kuid_t ouid, + const char *info, int error); + +struct aa_perms *aa_lookup_fperms(struct aa_policydb *file_rules, + aa_state_t state, struct path_cond *cond); +aa_state_t aa_str_perms(struct aa_policydb *file_rules, aa_state_t start, + const char *name, struct path_cond *cond, + struct aa_perms *perms); + +int aa_path_perm(const char *op, const struct cred *subj_cred, + struct aa_label *label, const struct path *path, + int flags, u32 request, struct path_cond *cond); + +int aa_path_link(const struct cred *subj_cred, struct aa_label *label, + struct dentry *old_dentry, const struct path *new_dir, + struct dentry *new_dentry); + +int aa_file_perm(const char *op, const struct cred *subj_cred, + struct aa_label *label, struct file *file, + u32 request, bool in_atomic); + +void aa_inherit_files(const struct cred *cred, struct files_struct *files); + + +/** + * aa_map_file_perms - map file flags to AppArmor permissions + * @file: open file to map flags to AppArmor permissions + * + * Returns: apparmor permission set for the file + */ +static inline u32 aa_map_file_to_perms(struct file *file) +{ + int flags = file->f_flags; + u32 perms = 0; + + if (file->f_mode & FMODE_WRITE) + perms |= MAY_WRITE; + if (file->f_mode & FMODE_READ) + perms |= MAY_READ; + + if ((flags & O_APPEND) && (perms & MAY_WRITE)) + perms = (perms & ~MAY_WRITE) | MAY_APPEND; + /* trunc implies write permission */ + if (flags & O_TRUNC) + perms |= MAY_WRITE; + if (flags & O_CREAT) + perms |= AA_MAY_CREATE; + + return perms; +} + +#endif /* __AA_FILE_H */ |