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-rw-r--r--security/smack/smack.h505
1 files changed, 505 insertions, 0 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
+ *
+ * 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/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 1
+#endif
+
+#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
+#define SMACK_IPV6_SECMARK_LABELING 1
+#endif
+
+/*
+ * 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 {
+ struct smack_known *smk_root;
+ struct smack_known *smk_floor;
+ struct smack_known *smk_hat;
+ struct smack_known *smk_default;
+ int smk_flags;
+};
+
+/*
+ * Superblock flags
+ */
+#define SMK_SB_INITIALIZED 0x01
+#define SMK_SB_UNTRUSTED 0x02
+
+struct socket_smack {
+ struct smack_known *smk_out; /* outbound label */
+ struct smack_known *smk_in; /* inbound label */
+ struct smack_known *smk_packet; /* TCP peer label */
+ int smk_state; /* netlabel socket states */
+};
+#define SMK_NETLBL_UNSET 0
+#define SMK_NETLBL_UNLABELED 1
+#define SMK_NETLBL_LABELED 2
+#define SMK_NETLBL_REQSKB 3
+
+/*
+ * Inode smack data
+ */
+struct inode_smack {
+ struct smack_known *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 */
+ 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 smack_known *smk_transmuted;/* label when transmuted */
+ struct list_head smk_rules; /* per task access rules */
+ struct mutex smk_rules_lock; /* lock for the rules */
+ struct list_head smk_relabel; /* transit allowed labels */
+};
+
+#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
+#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
+#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
+#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */
+
+/*
+ * A label access rule.
+ */
+struct smack_rule {
+ struct list_head list;
+ struct smack_known *smk_subject;
+ struct smack_known *smk_object;
+ int smk_access;
+};
+
+/*
+ * An entry in the table identifying IPv4 hosts.
+ */
+struct smk_net4addr {
+ struct list_head list;
+ struct in_addr smk_host; /* network address */
+ struct in_addr smk_mask; /* network mask */
+ int smk_masks; /* mask size */
+ struct smack_known *smk_label; /* label */
+};
+
+/*
+ * 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 */
+ struct smack_known *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 */
+ struct smack_known *smk_in; /* inbound label */
+ struct smack_known *smk_out; /* outgoing label */
+ short smk_sock_type; /* Socket type */
+ short smk_can_reuse;
+};
+
+struct smack_known_list_elem {
+ struct list_head list;
+ struct smack_known *smk_label;
+};
+
+enum {
+ Opt_error = -1,
+ Opt_fsdefault = 0,
+ Opt_fsfloor = 1,
+ Opt_fshat = 2,
+ Opt_fsroot = 3,
+ Opt_fstransmute = 4,
+};
+
+#define SMACK_DELETE_OPTION "-DELETE"
+#define SMACK_CIPSO_OPTION "-CIPSO"
+
+/*
+ * 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 */
+
+/*
+ * Ptrace rules
+ */
+#define SMACK_PTRACE_DEFAULT 0
+#define SMACK_PTRACE_EXACT 1
+#define SMACK_PTRACE_DRACONIAN 2
+#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN
+
+/*
+ * 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 0x00001000 /* Controls directory labeling */
+#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
+#define MAY_BRINGUP 0x00004000 /* Report use of this rule */
+
+/*
+ * The policy for delivering signals is configurable.
+ * It is usually "write", but can be "append".
+ */
+#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS
+#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */
+#else
+#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */
+#endif
+
+#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
+#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
+#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */
+
+/*
+ * 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 (rwxatlb)
+ */
+#define SMK_NUM_ACCESS_TYPE 7
+
+/* 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_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 16
+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)
+{
+ return cred->security + smack_blob_sizes.lbs_cred;
+}
+
+static inline struct smack_known **smack_file(const struct file *file)
+{
+ return (struct smack_known **)(file->f_security +
+ smack_blob_sizes.lbs_file);
+}
+
+static inline struct inode_smack *smack_inode(const struct inode *inode)
+{
+ return inode->i_security + smack_blob_sizes.lbs_inode;
+}
+
+static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
+{
+ return msg->security + smack_blob_sizes.lbs_msg_msg;
+}
+
+static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
+{
+ return ipc->security + smack_blob_sizes.lbs_ipc;
+}
+
+static inline struct superblock_smack *smack_superblock(
+ const struct super_block *superblock)
+{
+ return superblock->s_security + smack_blob_sizes.lbs_superblock;
+}
+
+/*
+ * Is the directory transmuting?
+ */
+static inline int smk_inode_transmutable(const struct inode *isp)
+{
+ struct inode_smack *sip = smack_inode(isp);
+ return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
+}
+
+/*
+ * Present a pointer to the smack label entry in an inode blob.
+ */
+static inline struct smack_known *smk_of_inode(const struct inode *isp)
+{
+ struct inode_smack *sip = smack_inode(isp);
+ 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;
+}
+
+static inline struct smack_known *smk_of_task_struct_obj(
+ const struct task_struct *t)
+{
+ struct smack_known *skp;
+ const struct cred *cred;
+
+ rcu_read_lock();
+
+ cred = __task_cred(t);
+ skp = smk_of_task(smack_cred(cred));
+
+ rcu_read_unlock();
+
+ return skp;
+}
+
+/*
+ * 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(smack_cred(current_cred()));
+}
+
+/*
+ * 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_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 */