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513 lines
13 KiB
513 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2007 Casey Schaufler <[email protected]> |
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* |
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* Author: |
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* Casey Schaufler <[email protected]> |
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*/ |
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#ifndef _SECURITY_SMACK_H |
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#define _SECURITY_SMACK_H |
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#include <linux/capability.h> |
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#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) |
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#include <linux/in6.h> |
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#endif /* CONFIG_IPV6 */ |
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#include <net/netlabel.h> |
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#include <linux/list.h> |
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#include <linux/rculist.h> |
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#include <linux/lsm_audit.h> |
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#include <linux/msg.h> |
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/* |
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* Use IPv6 port labeling if IPv6 is enabled and secmarks |
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* are not being used. |
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*/ |
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#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER) |
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#define SMACK_IPV6_PORT_LABELING 1 |
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#endif |
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#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER) |
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#define SMACK_IPV6_SECMARK_LABELING 1 |
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#endif |
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/* |
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* Smack labels were limited to 23 characters for a long time. |
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*/ |
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#define SMK_LABELLEN 24 |
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#define SMK_LONGLABEL 256 |
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/* |
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* This is the repository for labels seen so that it is |
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* not necessary to keep allocating tiny chuncks of memory |
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* and so that they can be shared. |
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* |
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* Labels are never modified in place. Anytime a label |
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* is imported (e.g. xattrset on a file) the list is checked |
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* for it and it is added if it doesn't exist. The address |
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* is passed out in either case. Entries are added, but |
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* never deleted. |
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* |
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* Since labels are hanging around anyway it doesn't |
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* hurt to maintain a secid for those awkward situations |
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* where kernel components that ought to use LSM independent |
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* interfaces don't. The secid should go away when all of |
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* these components have been repaired. |
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* |
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* The cipso value associated with the label gets stored here, too. |
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* |
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* Keep the access rules for this subject label here so that |
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* the entire set of rules does not need to be examined every |
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* time. |
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*/ |
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struct smack_known { |
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struct list_head list; |
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struct hlist_node smk_hashed; |
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char *smk_known; |
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u32 smk_secid; |
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struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */ |
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struct list_head smk_rules; /* access rules */ |
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struct mutex smk_rules_lock; /* lock for rules */ |
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}; |
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/* |
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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 |
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* bigger than can be used, and 24 is the next lower multiple |
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* of 8, and there are too many issues if there isn't space set |
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* aside for the terminating null byte. |
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*/ |
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#define SMK_CIPSOLEN 24 |
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struct superblock_smack { |
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struct smack_known *smk_root; |
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struct smack_known *smk_floor; |
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struct smack_known *smk_hat; |
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struct smack_known *smk_default; |
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int smk_flags; |
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}; |
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/* |
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* Superblock flags |
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*/ |
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#define SMK_SB_INITIALIZED 0x01 |
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#define SMK_SB_UNTRUSTED 0x02 |
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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 */ |
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struct smack_known *smk_packet; /* TCP peer label */ |
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int smk_state; /* netlabel socket states */ |
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}; |
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#define SMK_NETLBL_UNSET 0 |
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#define SMK_NETLBL_UNLABELED 1 |
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#define SMK_NETLBL_LABELED 2 |
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#define SMK_NETLBL_REQSKB 3 |
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/* |
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* Inode smack data |
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*/ |
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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 */ |
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struct smack_known *smk_mmap; /* label of the mmap domain */ |
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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 */ |
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struct smack_known *smk_forked; /* label when forked */ |
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struct list_head smk_rules; /* per task access rules */ |
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struct mutex smk_rules_lock; /* lock for the rules */ |
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struct list_head smk_relabel; /* transit allowed labels */ |
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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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/* |
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* A label access rule. |
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*/ |
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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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/* |
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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 */ |
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struct smack_known *smk_label; /* label */ |
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}; |
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/* |
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* An entry in the table identifying IPv6 hosts. |
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*/ |
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struct smk_net6addr { |
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struct list_head list; |
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struct in6_addr smk_host; /* network address */ |
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struct in6_addr smk_mask; /* network mask */ |
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int smk_masks; /* mask size */ |
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struct smack_known *smk_label; /* label */ |
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}; |
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/* |
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* An entry in the table identifying ports. |
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*/ |
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struct smk_port_label { |
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struct list_head list; |
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struct sock *smk_sock; /* socket initialized on */ |
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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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short smk_sock_type; /* Socket type */ |
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short smk_can_reuse; |
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}; |
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struct smack_known_list_elem { |
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struct list_head list; |
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struct smack_known *smk_label; |
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}; |
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/* Super block security struct flags for mount options */ |
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#define FSDEFAULT_MNT 0x01 |
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#define FSFLOOR_MNT 0x02 |
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#define FSHAT_MNT 0x04 |
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#define FSROOT_MNT 0x08 |
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#define FSTRANS_MNT 0x10 |
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#define NUM_SMK_MNT_OPTS 5 |
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enum { |
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Opt_error = -1, |
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Opt_fsdefault = 0, |
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Opt_fsfloor = 1, |
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Opt_fshat = 2, |
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Opt_fsroot = 3, |
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Opt_fstransmute = 4, |
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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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* CIPSO defaults. |
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*/ |
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#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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/* |
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* CIPSO 2.2 standard is 239, but Smack wants to use the |
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* categories in a structured way that limits the value to |
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* the bits in 23 bytes, hence the unusual number. |
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*/ |
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#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */ |
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/* |
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* Ptrace rules |
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*/ |
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#define SMACK_PTRACE_DEFAULT 0 |
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#define SMACK_PTRACE_EXACT 1 |
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#define SMACK_PTRACE_DRACONIAN 2 |
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#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN |
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/* |
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* Flags for untraditional access modes. |
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* It shouldn't be necessary to avoid conflicts with definitions |
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* in fs.h, but do so anyway. |
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*/ |
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#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */ |
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#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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* The policy for delivering signals is configurable. |
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* It is usually "write", but can be "append". |
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*/ |
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#ifdef CONFIG_SECURITY_SMACK_APPEND_SIGNALS |
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#define MAY_DELIVER MAY_APPEND /* Signal delivery requires append */ |
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#else |
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#define MAY_DELIVER MAY_WRITE /* Signal delivery requires write */ |
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#endif |
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#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */ |
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#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */ |
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#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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*/ |
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#define MAY_ANYREAD (MAY_READ | MAY_EXEC) |
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#define MAY_READWRITE (MAY_READ | MAY_WRITE) |
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#define MAY_NOT 0 |
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/* |
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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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/* SMACK data */ |
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struct smack_audit_data { |
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const char *function; |
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char *subject; |
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char *object; |
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char *request; |
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int result; |
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}; |
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/* |
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* Smack audit data; is empty if CONFIG_AUDIT not set |
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* to save some stack |
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*/ |
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struct smk_audit_info { |
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#ifdef CONFIG_AUDIT |
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struct common_audit_data a; |
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struct smack_audit_data sad; |
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#endif |
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}; |
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/* |
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* These functions are in smack_access.c |
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*/ |
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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 *, |
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int, struct smk_audit_info *); |
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int smk_tskacc(struct task_smack *, struct smack_known *, |
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u32, struct smk_audit_info *); |
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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); |
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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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bool smack_privileged(int cap); |
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bool smack_privileged_cred(int cap, const struct cred *cred); |
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void smk_destroy_label_list(struct list_head *list); |
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int smack_populate_secattr(struct smack_known *skp); |
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/* |
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* Shared data. |
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*/ |
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extern int smack_enabled __initdata; |
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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 |
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extern struct smack_known *smack_unconfined; |
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#endif |
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extern int smack_ptrace_rule; |
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extern struct lsm_blob_sizes smack_blob_sizes; |
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extern struct smack_known smack_known_floor; |
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extern struct smack_known smack_known_hat; |
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extern struct smack_known smack_known_huh; |
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extern struct smack_known smack_known_star; |
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extern struct smack_known smack_known_web; |
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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; |
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extern struct list_head smk_net6addr_list; |
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extern struct mutex smack_onlycap_lock; |
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extern struct list_head smack_onlycap_list; |
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#define SMACK_HASH_SLOTS 16 |
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extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; |
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extern struct kmem_cache *smack_rule_cache; |
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static inline struct task_smack *smack_cred(const struct cred *cred) |
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{ |
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return cred->security + smack_blob_sizes.lbs_cred; |
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} |
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static inline struct smack_known **smack_file(const struct file *file) |
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{ |
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return (struct smack_known **)(file->f_security + |
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smack_blob_sizes.lbs_file); |
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} |
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static inline struct inode_smack *smack_inode(const struct inode *inode) |
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{ |
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return inode->i_security + smack_blob_sizes.lbs_inode; |
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} |
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static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg) |
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{ |
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return msg->security + smack_blob_sizes.lbs_msg_msg; |
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} |
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static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc) |
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{ |
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return ipc->security + smack_blob_sizes.lbs_ipc; |
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} |
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static inline struct superblock_smack *smack_superblock( |
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const struct super_block *superblock) |
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{ |
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return superblock->s_security + smack_blob_sizes.lbs_superblock; |
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} |
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/* |
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* Is the directory transmuting? |
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*/ |
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static inline int smk_inode_transmutable(const struct inode *isp) |
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{ |
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struct inode_smack *sip = smack_inode(isp); |
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return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; |
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} |
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/* |
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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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{ |
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struct inode_smack *sip = smack_inode(isp); |
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return sip->smk_inode; |
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} |
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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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{ |
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return tsp->smk_task; |
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} |
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static inline struct smack_known *smk_of_task_struct_obj( |
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const struct task_struct *t) |
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{ |
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struct smack_known *skp; |
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const struct cred *cred; |
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rcu_read_lock(); |
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cred = __task_cred(t); |
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skp = smk_of_task(smack_cred(cred)); |
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rcu_read_unlock(); |
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return skp; |
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} |
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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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{ |
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return tsp->smk_forked; |
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} |
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/* |
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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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{ |
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return smk_of_task(smack_cred(current_cred())); |
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} |
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/* |
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* logging functions |
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*/ |
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#define SMACK_AUDIT_DENIED 0x1 |
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#define SMACK_AUDIT_ACCEPT 0x2 |
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extern int log_policy; |
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void smack_log(char *subject_label, char *object_label, |
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int request, |
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int result, struct smk_audit_info *auditdata); |
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#ifdef CONFIG_AUDIT |
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/* |
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* some inline functions to set up audit data |
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* they do nothing if CONFIG_AUDIT is not set |
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* |
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*/ |
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static inline void smk_ad_init(struct smk_audit_info *a, const char *func, |
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char type) |
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{ |
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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; |
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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, |
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char type, struct lsm_network_audit *net) |
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{ |
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smk_ad_init(a, func, type); |
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memset(net, 0, sizeof(*net)); |
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a->a.u.net = net; |
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} |
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static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
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struct task_struct *t) |
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{ |
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a->a.u.tsk = t; |
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} |
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static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, |
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struct dentry *d) |
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{ |
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a->a.u.dentry = d; |
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} |
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static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, |
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struct inode *i) |
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{ |
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a->a.u.inode = i; |
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} |
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static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, |
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struct path p) |
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{ |
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a->a.u.path = p; |
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} |
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static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, |
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struct sock *sk) |
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{ |
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a->a.u.net->sk = sk; |
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} |
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#else /* no AUDIT */ |
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static inline void smk_ad_init(struct smk_audit_info *a, const char *func, |
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char type) |
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{ |
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} |
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static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a, |
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struct task_struct *t) |
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{ |
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} |
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static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a, |
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struct dentry *d) |
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{ |
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} |
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static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a, |
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struct inode *i) |
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{ |
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} |
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static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a, |
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struct path p) |
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{ |
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} |
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static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a, |
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struct sock *sk) |
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{ |
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} |
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#endif |
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#endif /* _SECURITY_SMACK_H */
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