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security/smack/smack.h
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/* * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. * * Author: * Casey Schaufler <casey@schaufler-ca.com> * */ #ifndef _SECURITY_SMACK_H #define _SECURITY_SMACK_H #include <linux/capability.h> #include <linux/spinlock.h> |
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#include <linux/lsm_hooks.h> |
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#include <linux/in.h> |
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#if IS_ENABLED(CONFIG_IPV6) #include <linux/in6.h> #endif /* CONFIG_IPV6 */ |
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#include <net/netlabel.h> |
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#include <linux/list.h> #include <linux/rculist.h> |
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#include <linux/lsm_audit.h> |
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/* |
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* 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 1 #endif #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER) #define SMACK_IPV6_SECMARK_LABELING 1 #endif /* |
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* Smack labels were limited to 23 characters for a long time. */ #define SMK_LABELLEN 24 #define SMK_LONGLABEL 256 /* |
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* 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 { struct list_head list; |
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struct hlist_node smk_hashed; |
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char *smk_known; u32 smk_secid; struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ struct list_head smk_rules; /* access rules */ struct mutex smk_rules_lock; /* lock for rules */ }; /* |
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* Maximum number of bytes for the levels in a CIPSO IP option. |
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* 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. */ |
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#define SMK_CIPSOLEN 24 |
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|
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struct superblock_smack { |
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struct smack_known *smk_root; struct smack_known *smk_floor; struct smack_known *smk_hat; struct smack_known *smk_default; int smk_initialized; |
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}; struct socket_smack { |
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struct smack_known *smk_out; /* outbound label */ |
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struct smack_known *smk_in; /* inbound label */ struct smack_known *smk_packet; /* TCP peer label */ |
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}; /* * Inode smack data */ struct inode_smack { |
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struct smack_known *smk_inode; /* label of the fso */ |
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struct smack_known *smk_task; /* label of the task */ struct smack_known *smk_mmap; /* label of the mmap domain */ struct mutex smk_lock; /* initialization lock */ int smk_flags; /* smack inode flags */ |
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}; |
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struct task_smack { |
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struct smack_known *smk_task; /* label for access control */ struct smack_known *smk_forked; /* label when forked */ |
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struct list_head smk_rules; /* per task access rules */ struct mutex smk_rules_lock; /* lock for the rules */ |
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}; |
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#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */ |
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#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */ |
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#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */ |
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#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */ |
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/* * A label access rule. */ struct smack_rule { |
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struct list_head list; |
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struct smack_known *smk_subject; |
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struct smack_known *smk_object; |
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int smk_access; |
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}; /* |
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* An entry in the table identifying IPv4 hosts. |
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*/ |
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struct smk_net4addr { |
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struct list_head list; |
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struct in_addr smk_host; /* network address */ |
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struct in_addr smk_mask; /* network mask */ |
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int smk_masks; /* mask size */ struct smack_known *smk_label; /* label */ }; #if IS_ENABLED(CONFIG_IPV6) /* * An entry in the table identifying IPv6 hosts. */ struct smk_net6addr { struct list_head list; struct in6_addr smk_host; /* network address */ struct in6_addr smk_mask; /* network mask */ int smk_masks; /* mask size */ |
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struct smack_known *smk_label; /* label */ |
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}; |
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#endif /* CONFIG_IPV6 */ |
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|
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#ifdef SMACK_IPV6_PORT_LABELING |
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/* |
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* An entry in the table identifying ports. */ struct smk_port_label { struct list_head list; struct sock *smk_sock; /* socket initialized on */ unsigned short smk_port; /* the port number */ |
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struct smack_known *smk_in; /* inbound label */ |
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struct smack_known *smk_out; /* outgoing label */ |
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}; |
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#endif /* SMACK_IPV6_PORT_LABELING */ |
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|
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struct smack_onlycap { struct list_head list; struct smack_known *smk_label; }; |
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/* Super block security struct flags for mount options */ #define FSDEFAULT_MNT 0x01 #define FSFLOOR_MNT 0x02 #define FSHAT_MNT 0x04 #define FSROOT_MNT 0x08 #define FSTRANS_MNT 0x10 #define NUM_SMK_MNT_OPTS 5 enum { Opt_error = -1, Opt_fsdefault = 1, Opt_fsfloor = 2, Opt_fshat = 3, Opt_fsroot = 4, Opt_fstransmute = 5, }; |
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/* * Mount options */ #define SMK_FSDEFAULT "smackfsdef=" #define SMK_FSFLOOR "smackfsfloor=" #define SMK_FSHAT "smackfshat=" #define SMK_FSROOT "smackfsroot=" |
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#define SMK_FSTRANS "smackfstransmute=" |
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|
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#define SMACK_DELETE_OPTION "-DELETE" |
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#define SMACK_CIPSO_OPTION "-CIPSO" |
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/* |
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* How communications on this socket are treated. * Usually it's determined by the underlying netlabel code * but there are certain cases, including single label hosts * and potentially single label interfaces for which the * treatment can not be known in advance. * * The possibility of additional labeling schemes being * introduced in the future exists as well. */ #define SMACK_UNLABELED_SOCKET 0 #define SMACK_CIPSO_SOCKET 1 /* |
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* CIPSO defaults. */ #define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */ |
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#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */ |
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#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */ |
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#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */ |
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#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */ |
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/* * 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 184 /* 23 * 8 */ |
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/* |
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* Ptrace rules */ #define SMACK_PTRACE_DEFAULT 0 #define SMACK_PTRACE_EXACT 1 #define SMACK_PTRACE_DRACONIAN 2 #define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN /* |
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* Flags for untraditional access modes. * It shouldn't be necessary to avoid conflicts with definitions * in fs.h, but do so anyway. |
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*/ |
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#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ #define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */ |
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#define MAY_BRINGUP 0x00004000 /* Report use of this rule */ |
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|
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#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */ #define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */ #define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */ |
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/* |
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* Just to make the common cases easier to deal with */ |
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#define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
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#define MAY_READWRITE (MAY_READ | MAY_WRITE) #define MAY_NOT 0 /* |
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* Number of access types used by Smack (rwxatlb) |
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*/ |
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#define SMK_NUM_ACCESS_TYPE 7 |
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|
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/* SMACK data */ struct smack_audit_data { const char *function; char *subject; char *object; char *request; int result; }; |
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/* * Smack audit data; is empty if CONFIG_AUDIT not set * to save some stack */ struct smk_audit_info { #ifdef CONFIG_AUDIT struct common_audit_data a; |
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struct smack_audit_data sad; |
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#endif }; |
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/* * These functions are in smack_access.c */ |
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int smk_access_entry(char *, char *, struct list_head *); |
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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 *); |
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struct smack_known *smack_from_secid(const u32); |
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char *smk_parse_smack(const char *string, int len); int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int); |
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struct smack_known *smk_import_entry(const char *, int); |
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void smk_insert_entry(struct smack_known *skp); |
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struct smack_known *smk_find_entry(const char *); |
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int smack_privileged(int cap); |
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/* * Shared data. */ |
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extern int smack_enabled; |
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extern int smack_cipso_direct; |
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extern int smack_cipso_mapped; |
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extern struct smack_known *smack_net_ambient; |
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extern struct smack_known *smack_syslog_label; |
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP extern struct smack_known *smack_unconfined; #endif |
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extern int smack_ptrace_rule; |
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|
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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_invalid; extern struct smack_known smack_known_star; |
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extern struct smack_known smack_known_web; |
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|
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extern struct mutex smack_known_lock; |
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extern struct list_head smack_known_list; |
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extern struct list_head smk_net4addr_list; #if IS_ENABLED(CONFIG_IPV6) extern struct list_head smk_net6addr_list; #endif /* CONFIG_IPV6 */ |
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|
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extern struct mutex smack_onlycap_lock; extern struct list_head smack_onlycap_list; |
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#define SMACK_HASH_SLOTS 16 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; |
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/* |
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* Is the directory transmuting? */ static inline int smk_inode_transmutable(const struct inode *isp) { struct inode_smack *sip = isp->i_security; return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; } /* |
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* Present a pointer to the smack label entry in an inode blob. |
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*/ |
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static inline struct smack_known *smk_of_inode(const struct inode *isp) |
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{ struct inode_smack *sip = isp->i_security; return sip->smk_inode; } |
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/* |
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* Present a pointer to the smack label entry in an task blob. |
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*/ |
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static inline struct smack_known *smk_of_task(const struct task_smack *tsp) |
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{ return tsp->smk_task; } |
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static inline struct smack_known *smk_of_task_struct(const struct task_struct *t) { struct smack_known *skp; rcu_read_lock(); skp = smk_of_task(__task_cred(t)->security); rcu_read_unlock(); return skp; } |
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/* |
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* Present a pointer to the forked smack label entry in an task blob. |
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*/ |
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static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) |
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{ return tsp->smk_forked; } /* |
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* Present a pointer to the smack label in the current task blob. |
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*/ |
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static inline struct smack_known *smk_of_current(void) |
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{ return smk_of_task(current_security()); } /* |
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* logging functions */ #define SMACK_AUDIT_DENIED 0x1 #define SMACK_AUDIT_ACCEPT 0x2 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) { |
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memset(&a->sad, 0, sizeof(a->sad)); |
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a->a.type = type; |
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a->a.smack_audit_data = &a->sad; a->a.smack_audit_data->function = func; |
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} |
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static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func, char type, struct lsm_network_audit *net) { smk_ad_init(a, func, type); memset(net, 0, sizeof(*net)); a->a.u.net = net; } |
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static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, struct task_struct *t) { a->a.u.tsk = t; } static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, struct dentry *d) { |
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a->a.u.dentry = d; |
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} static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, struct inode *i) { |
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a->a.u.inode = i; |
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} static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, struct path p) { |
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a->a.u.path = p; |
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} static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, struct sock *sk) { |
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a->a.u.net->sk = sk; |
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} #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_path_mnt(struct smk_audit_info *a, struct vfsmount *m) { } 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 |
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#endif /* _SECURITY_SMACK_H */ |