mirror of https://gitee.com/openkylin/linux.git
410 lines
10 KiB
C
410 lines
10 KiB
C
/*
|
|
* 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>
|
|
#include <linux/security.h>
|
|
#include <linux/in.h>
|
|
#include <net/netlabel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/lsm_audit.h>
|
|
|
|
/*
|
|
* Smack labels were limited to 23 characters for a long time.
|
|
*/
|
|
#define SMK_LABELLEN 24
|
|
#define SMK_LONGLABEL 256
|
|
|
|
/*
|
|
* 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;
|
|
struct hlist_node smk_hashed;
|
|
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 */
|
|
};
|
|
|
|
/*
|
|
* 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 24
|
|
|
|
struct superblock_smack {
|
|
char *smk_root;
|
|
char *smk_floor;
|
|
char *smk_hat;
|
|
char *smk_default;
|
|
int smk_initialized;
|
|
};
|
|
|
|
struct socket_smack {
|
|
struct smack_known *smk_out; /* outbound label */
|
|
char *smk_in; /* inbound label */
|
|
char *smk_packet; /* TCP peer label */
|
|
};
|
|
|
|
/*
|
|
* Inode smack data
|
|
*/
|
|
struct inode_smack {
|
|
char *smk_inode; /* label of the fso */
|
|
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 */
|
|
};
|
|
|
|
struct task_smack {
|
|
struct smack_known *smk_task; /* label for access control */
|
|
struct smack_known *smk_forked; /* label when forked */
|
|
struct list_head smk_rules; /* per task access rules */
|
|
struct mutex smk_rules_lock; /* lock for the rules */
|
|
};
|
|
|
|
#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
|
|
#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
|
|
#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
|
|
|
|
/*
|
|
* A label access rule.
|
|
*/
|
|
struct smack_rule {
|
|
struct list_head list;
|
|
struct smack_known *smk_subject;
|
|
char *smk_object;
|
|
int smk_access;
|
|
};
|
|
|
|
/*
|
|
* An entry in the table identifying hosts.
|
|
*/
|
|
struct smk_netlbladdr {
|
|
struct list_head list;
|
|
struct sockaddr_in smk_host; /* network address */
|
|
struct in_addr smk_mask; /* network mask */
|
|
char *smk_label; /* label */
|
|
};
|
|
|
|
/*
|
|
* 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 */
|
|
char *smk_in; /* incoming label */
|
|
struct smack_known *smk_out; /* outgoing label */
|
|
};
|
|
|
|
/*
|
|
* Mount options
|
|
*/
|
|
#define SMK_FSDEFAULT "smackfsdef="
|
|
#define SMK_FSFLOOR "smackfsfloor="
|
|
#define SMK_FSHAT "smackfshat="
|
|
#define SMK_FSROOT "smackfsroot="
|
|
#define SMK_FSTRANS "smackfstransmute="
|
|
|
|
#define SMACK_CIPSO_OPTION "-CIPSO"
|
|
|
|
/*
|
|
* 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
|
|
|
|
/*
|
|
* CIPSO defaults.
|
|
*/
|
|
#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
|
|
#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
|
|
#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
|
|
#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
|
|
#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
|
|
/*
|
|
* 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 */
|
|
|
|
/*
|
|
* Flag for transmute access
|
|
*/
|
|
#define MAY_TRANSMUTE 64
|
|
/*
|
|
* Just to make the common cases easier to deal with
|
|
*/
|
|
#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
|
|
#define MAY_READWRITE (MAY_READ | MAY_WRITE)
|
|
#define MAY_NOT 0
|
|
|
|
/*
|
|
* Number of access types used by Smack (rwxat)
|
|
*/
|
|
#define SMK_NUM_ACCESS_TYPE 5
|
|
|
|
/* SMACK data */
|
|
struct smack_audit_data {
|
|
const char *function;
|
|
char *subject;
|
|
char *object;
|
|
char *request;
|
|
int result;
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
struct smack_audit_data sad;
|
|
#endif
|
|
};
|
|
/*
|
|
* These functions are in smack_lsm.c
|
|
*/
|
|
struct inode_smack *new_inode_smack(char *);
|
|
|
|
/*
|
|
* These functions are in smack_access.c
|
|
*/
|
|
int smk_access_entry(char *, char *, struct list_head *);
|
|
int smk_access(struct smack_known *, char *, int, struct smk_audit_info *);
|
|
int smk_curacc(char *, 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);
|
|
char *smk_import(const char *, 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 *);
|
|
u32 smack_to_secid(const char *);
|
|
|
|
/*
|
|
* Shared data.
|
|
*/
|
|
extern int smack_cipso_direct;
|
|
extern int smack_cipso_mapped;
|
|
extern struct smack_known *smack_net_ambient;
|
|
extern char *smack_onlycap;
|
|
extern const char *smack_cipso_option;
|
|
|
|
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;
|
|
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_netlbladdr_list;
|
|
|
|
extern struct security_operations smack_ops;
|
|
|
|
#define SMACK_HASH_SLOTS 16
|
|
extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* Present a pointer to the smack label in an inode blob.
|
|
*/
|
|
static inline char *smk_of_inode(const struct inode *isp)
|
|
{
|
|
struct inode_smack *sip = isp->i_security;
|
|
return sip->smk_inode;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
return tsp->smk_task;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
return tsp->smk_forked;
|
|
}
|
|
|
|
/*
|
|
* Present a pointer to the smack label in the current task blob.
|
|
*/
|
|
static inline struct smack_known *smk_of_current(void)
|
|
{
|
|
return smk_of_task(current_security());
|
|
}
|
|
|
|
/*
|
|
* Is the task privileged and allowed to be privileged
|
|
* by the onlycap rule.
|
|
*/
|
|
static inline int smack_privileged(int cap)
|
|
{
|
|
struct smack_known *skp = smk_of_current();
|
|
|
|
if (!capable(cap))
|
|
return 0;
|
|
if (smack_onlycap == NULL || smack_onlycap == skp->smk_known)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
memset(&a->sad, 0, sizeof(a->sad));
|
|
a->a.type = type;
|
|
a->a.smack_audit_data = &a->sad;
|
|
a->a.smack_audit_data->function = func;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
a->a.u.dentry = d;
|
|
}
|
|
static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
|
|
struct inode *i)
|
|
{
|
|
a->a.u.inode = i;
|
|
}
|
|
static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
|
|
struct path p)
|
|
{
|
|
a->a.u.path = p;
|
|
}
|
|
static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
|
|
struct sock *sk)
|
|
{
|
|
a->a.u.net->sk = 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_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
|
|
|
|
#endif /* _SECURITY_SMACK_H */
|