/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2007 Casey Schaufler <[email protected]> * * Author: * Casey Schaufler <[email protected]> */ #ifndef _SECURITY_SMACK_H #define _SECURITY_SMACK_H #include <linux/capability.h> #include <linux/spinlock.h> #include <linux/lsm_hooks.h> #include <linux/in.h> #if IS_ENABLED(CONFIG_IPV6) #include <linux/in6.h> #endif /* CONFIG_IPV6 */ #include <net/netlabel.h> #include <linux/list.h> #include <linux/rculist.h> #include <linux/lsm_audit.h> #include <linux/msg.h> /* * Use IPv6 port labeling if IPv6 is enabled and secmarks * are not being used. */ #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) #define SMACK_IPV6_PORT_LABELING … #endif #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER) #define SMACK_IPV6_SECMARK_LABELING … #endif /* * Smack labels were limited to 23 characters for a long time. */ #define SMK_LABELLEN … #define SMK_LONGLABEL … /* * This is the repository for labels seen so that it is * not necessary to keep allocating tiny chuncks of memory * and so that they can be shared. * * Labels are never modified in place. Anytime a label * is imported (e.g. xattrset on a file) the list is checked * for it and it is added if it doesn't exist. The address * is passed out in either case. Entries are added, but * never deleted. * * Since labels are hanging around anyway it doesn't * hurt to maintain a secid for those awkward situations * where kernel components that ought to use LSM independent * interfaces don't. The secid should go away when all of * these components have been repaired. * * The cipso value associated with the label gets stored here, too. * * Keep the access rules for this subject label here so that * the entire set of rules does not need to be examined every * time. */ struct smack_known { … }; /* * Maximum number of bytes for the levels in a CIPSO IP option. * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is * bigger than can be used, and 24 is the next lower multiple * of 8, and there are too many issues if there isn't space set * aside for the terminating null byte. */ #define SMK_CIPSOLEN … struct superblock_smack { … }; /* * Superblock flags */ #define SMK_SB_INITIALIZED … #define SMK_SB_UNTRUSTED … struct socket_smack { … }; #define SMK_NETLBL_UNSET … #define SMK_NETLBL_UNLABELED … #define SMK_NETLBL_LABELED … #define SMK_NETLBL_REQSKB … /* * Inode smack data */ struct inode_smack { … }; struct task_smack { … }; #define SMK_INODE_INSTANT … #define SMK_INODE_TRANSMUTE … #define SMK_INODE_CHANGED … #define SMK_INODE_IMPURE … /* * A label access rule. */ struct smack_rule { … }; /* * An entry in the table identifying IPv4 hosts. */ struct smk_net4addr { … }; /* * An entry in the table identifying IPv6 hosts. */ struct smk_net6addr { … }; /* * An entry in the table identifying ports. */ struct smk_port_label { … }; struct smack_known_list_elem { … }; enum { … }; #define SMACK_DELETE_OPTION … #define SMACK_CIPSO_OPTION … /* * CIPSO defaults. */ #define SMACK_CIPSO_DOI_DEFAULT … #define SMACK_CIPSO_DOI_INVALID … #define SMACK_CIPSO_DIRECT_DEFAULT … #define SMACK_CIPSO_MAPPED_DEFAULT … #define SMACK_CIPSO_MAXLEVEL … /* * CIPSO 2.2 standard is 239, but Smack wants to use the * categories in a structured way that limits the value to * the bits in 23 bytes, hence the unusual number. */ #define SMACK_CIPSO_MAXCATNUM … /* * Ptrace rules */ #define SMACK_PTRACE_DEFAULT … #define SMACK_PTRACE_EXACT … #define SMACK_PTRACE_DRACONIAN … #define SMACK_PTRACE_MAX … /* * Flags for untraditional access modes. * It shouldn't be necessary to avoid conflicts with definitions * in fs.h, but do so anyway. */ #define MAY_TRANSMUTE … #define MAY_LOCK … #define MAY_BRINGUP … /* * The policy for delivering signals is configurable. * It is usually "write", but can be "append". */ #ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS #define MAY_DELIVER … #else #define MAY_DELIVER … #endif #define SMACK_BRINGUP_ALLOW … #define SMACK_UNCONFINED_SUBJECT … #define SMACK_UNCONFINED_OBJECT … /* * Just to make the common cases easier to deal with */ #define MAY_ANYREAD … #define MAY_READWRITE … #define MAY_NOT … /* * Number of access types used by Smack (rwxatlb) */ #define SMK_NUM_ACCESS_TYPE … /* SMACK data */ struct smack_audit_data { … }; /* * Smack audit data; is empty if CONFIG_AUDIT not set * to save some stack */ struct smk_audit_info { … }; /* * These functions are in smack_access.c */ int smk_access_entry(char *, char *, struct list_head *); int smk_access(struct smack_known *, struct smack_known *, int, struct smk_audit_info *); int smk_tskacc(struct task_smack *, struct smack_known *, u32, struct smk_audit_info *); int smk_curacc(struct smack_known *, u32, struct smk_audit_info *); struct smack_known *smack_from_secid(const u32); char *smk_parse_smack(const char *string, int len); int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); struct smack_known *smk_import_entry(const char *, int); void smk_insert_entry(struct smack_known *skp); struct smack_known *smk_find_entry(const char *); bool smack_privileged(int cap); bool smack_privileged_cred(int cap, const struct cred *cred); void smk_destroy_label_list(struct list_head *list); int smack_populate_secattr(struct smack_known *skp); /* * Shared data. */ extern int smack_enabled __initdata; extern int smack_cipso_direct; extern int smack_cipso_mapped; extern struct smack_known *smack_net_ambient; extern struct smack_known *smack_syslog_label; #ifdef CONFIG_SECURITY_SMACK_BRINGUP extern struct smack_known *smack_unconfined; #endif extern int smack_ptrace_rule; extern struct lsm_blob_sizes smack_blob_sizes; extern struct smack_known smack_known_floor; extern struct smack_known smack_known_hat; extern struct smack_known smack_known_huh; extern struct smack_known smack_known_star; extern struct smack_known smack_known_web; extern struct mutex smack_known_lock; extern struct list_head smack_known_list; extern struct list_head smk_net4addr_list; extern struct list_head smk_net6addr_list; extern struct mutex smack_onlycap_lock; extern struct list_head smack_onlycap_list; #define SMACK_HASH_SLOTS … extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; extern struct kmem_cache *smack_rule_cache; static inline struct task_smack *smack_cred(const struct cred *cred) { … } static inline struct smack_known **smack_file(const struct file *file) { … } static inline struct inode_smack *smack_inode(const struct inode *inode) { … } static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg) { … } static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc) { … } static inline struct superblock_smack *smack_superblock( const struct super_block *superblock) { … } /* * Is the directory transmuting? */ static inline int smk_inode_transmutable(const struct inode *isp) { … } /* * Present a pointer to the smack label entry in an inode blob. */ static inline struct smack_known *smk_of_inode(const struct inode *isp) { … } /* * Present a pointer to the smack label entry in an task blob. */ static inline struct smack_known *smk_of_task(const struct task_smack *tsp) { … } static inline struct smack_known *smk_of_task_struct_obj( const struct task_struct *t) { … } /* * Present a pointer to the forked smack label entry in an task blob. */ static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) { … } /* * Present a pointer to the smack label in the current task blob. */ static inline struct smack_known *smk_of_current(void) { … } /* * logging functions */ #define SMACK_AUDIT_DENIED … #define SMACK_AUDIT_ACCEPT … extern int log_policy; void smack_log(char *subject_label, char *object_label, int request, int result, struct smk_audit_info *auditdata); #ifdef CONFIG_AUDIT /* * some inline functions to set up audit data * they do nothing if CONFIG_AUDIT is not set * */ static inline void smk_ad_init(struct smk_audit_info *a, const char *func, char type) { … } static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, char type, struct lsm_network_audit *net) { … } static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, struct task_struct *t) { … } static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, struct dentry *d) { … } static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, struct inode *i) { … } static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, struct path p) { … } static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, struct sock *sk) { … } #else /* no AUDIT */ static inline void smk_ad_init(struct smk_audit_info *a, const char *func, char type) { } static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, struct task_struct *t) { } static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, struct dentry *d) { } static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, struct inode *i) { } static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, struct path p) { } static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, struct sock *sk) { } #endif #endif /* _SECURITY_SMACK_H */
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