![Casey Schaufler](/assets/img/avatar_default.png)
Commit 272cd7a8c6
introduced
a change to the way rule lists are handled and reported in
the smackfs filesystem. One of the issues addressed had to
do with the termination of read requests on /smack/load.
This change introduced a error in /smack/cipso, which shares
some of the same list processing code.
This patch updates all the file access list handling in
smackfs to use the code introduced for /smack/load.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
1635 lines
37 KiB
C
1635 lines
37 KiB
C
/*
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* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* Authors:
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* Casey Schaufler <casey@schaufler-ca.com>
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* Ahmed S. Darwish <darwish.07@gmail.com>
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*
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* Special thanks to the authors of selinuxfs.
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*
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* Karl MacMillan <kmacmillan@tresys.com>
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* James Morris <jmorris@redhat.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/vmalloc.h>
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#include <linux/security.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/netlabel.h>
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#include <net/cipso_ipv4.h>
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#include <linux/seq_file.h>
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#include <linux/ctype.h>
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#include <linux/audit.h>
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#include "smack.h"
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/*
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* smackfs pseudo filesystem.
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*/
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enum smk_inos {
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SMK_ROOT_INO = 2,
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SMK_LOAD = 3, /* load policy */
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SMK_CIPSO = 4, /* load label -> CIPSO mapping */
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SMK_DOI = 5, /* CIPSO DOI */
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SMK_DIRECT = 6, /* CIPSO level indicating direct label */
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SMK_AMBIENT = 7, /* internet ambient label */
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SMK_NETLBLADDR = 8, /* single label hosts */
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SMK_ONLYCAP = 9, /* the only "capable" label */
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SMK_LOGGING = 10, /* logging */
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SMK_LOAD_SELF = 11, /* task specific rules */
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SMK_ACCESSES = 12, /* access policy */
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};
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/*
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* List locks
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*/
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static DEFINE_MUTEX(smack_list_lock);
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static DEFINE_MUTEX(smack_cipso_lock);
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static DEFINE_MUTEX(smack_ambient_lock);
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static DEFINE_MUTEX(smk_netlbladdr_lock);
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/*
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* This is the "ambient" label for network traffic.
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* If it isn't somehow marked, use this.
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* It can be reset via smackfs/ambient
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*/
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char *smack_net_ambient = smack_known_floor.smk_known;
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/*
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* This is the level in a CIPSO header that indicates a
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* smack label is contained directly in the category set.
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* It can be reset via smackfs/direct
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*/
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int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
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/*
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* Unless a process is running with this label even
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* having CAP_MAC_OVERRIDE isn't enough to grant
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* privilege to violate MAC policy. If no label is
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* designated (the NULL case) capabilities apply to
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* everyone. It is expected that the hat (^) label
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* will be used if any label is used.
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*/
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char *smack_onlycap;
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/*
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* Certain IP addresses may be designated as single label hosts.
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* Packets are sent there unlabeled, but only from tasks that
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* can write to the specified label.
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*/
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LIST_HEAD(smk_netlbladdr_list);
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/*
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* Rule lists are maintained for each label.
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* This master list is just for reading /smack/load.
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*/
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struct smack_master_list {
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struct list_head list;
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struct smack_rule *smk_rule;
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};
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LIST_HEAD(smack_rule_list);
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static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
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const char *smack_cipso_option = SMACK_CIPSO_OPTION;
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/*
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* Values for parsing cipso rules
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* SMK_DIGITLEN: Length of a digit field in a rule.
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* SMK_CIPSOMIN: Minimum possible cipso rule length.
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* SMK_CIPSOMAX: Maximum possible cipso rule length.
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*/
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#define SMK_DIGITLEN 4
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#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
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#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
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/*
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* Values for parsing MAC rules
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* SMK_ACCESS: Maximum possible combination of access permissions
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* SMK_ACCESSLEN: Maximum length for a rule access field
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* SMK_LOADLEN: Smack rule length
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*/
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#define SMK_OACCESS "rwxa"
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#define SMK_ACCESS "rwxat"
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#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
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#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
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#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
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#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
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/**
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* smk_netlabel_audit_set - fill a netlbl_audit struct
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* @nap: structure to fill
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*/
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static void smk_netlabel_audit_set(struct netlbl_audit *nap)
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{
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nap->loginuid = audit_get_loginuid(current);
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nap->sessionid = audit_get_sessionid(current);
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nap->secid = smack_to_secid(smk_of_current());
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}
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/*
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* Values for parsing single label host rules
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* "1.2.3.4 X"
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* "192.168.138.129/32 abcdefghijklmnopqrstuvw"
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*/
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#define SMK_NETLBLADDRMIN 9
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#define SMK_NETLBLADDRMAX 42
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/**
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* smk_set_access - add a rule to the rule list
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* @srp: the new rule to add
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* @rule_list: the list of rules
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* @rule_lock: the rule list lock
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*
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* Looks through the current subject/object/access list for
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* the subject/object pair and replaces the access that was
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* there. If the pair isn't found add it with the specified
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* access.
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*
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* Returns 1 if a rule was found to exist already, 0 if it is new
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* Returns 0 if nothing goes wrong or -ENOMEM if it fails
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* during the allocation of the new pair to add.
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*/
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static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
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struct mutex *rule_lock)
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{
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struct smack_rule *sp;
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int found = 0;
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mutex_lock(rule_lock);
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/*
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* Because the object label is less likely to match
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* than the subject label check it first
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*/
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list_for_each_entry_rcu(sp, rule_list, list) {
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if (sp->smk_object == srp->smk_object &&
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sp->smk_subject == srp->smk_subject) {
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found = 1;
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sp->smk_access = srp->smk_access;
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break;
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}
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}
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if (found == 0)
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list_add_rcu(&srp->list, rule_list);
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mutex_unlock(rule_lock);
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return found;
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}
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/**
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* smk_parse_rule - parse Smack rule from load string
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* @data: string to be parsed whose size is SMK_LOADLEN
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* @rule: Smack rule
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* @import: if non-zero, import labels
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*/
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static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
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{
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char smack[SMK_LABELLEN];
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struct smack_known *skp;
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if (import) {
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rule->smk_subject = smk_import(data, 0);
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if (rule->smk_subject == NULL)
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return -1;
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rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
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if (rule->smk_object == NULL)
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return -1;
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} else {
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smk_parse_smack(data, 0, smack);
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skp = smk_find_entry(smack);
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if (skp == NULL)
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return -1;
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rule->smk_subject = skp->smk_known;
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smk_parse_smack(data + SMK_LABELLEN, 0, smack);
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skp = smk_find_entry(smack);
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if (skp == NULL)
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return -1;
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rule->smk_object = skp->smk_known;
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}
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rule->smk_access = 0;
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switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
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case '-':
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break;
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case 'r':
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case 'R':
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rule->smk_access |= MAY_READ;
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break;
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default:
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return -1;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
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case '-':
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break;
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case 'w':
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case 'W':
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rule->smk_access |= MAY_WRITE;
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break;
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default:
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return -1;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
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case '-':
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break;
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case 'x':
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case 'X':
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rule->smk_access |= MAY_EXEC;
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break;
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default:
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return -1;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
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case '-':
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break;
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case 'a':
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case 'A':
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rule->smk_access |= MAY_APPEND;
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break;
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default:
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return -1;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) {
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case '-':
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break;
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case 't':
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case 'T':
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rule->smk_access |= MAY_TRANSMUTE;
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break;
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default:
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return -1;
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}
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return 0;
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}
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/**
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* smk_write_load_list - write() for any /smack/load
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* @file: file pointer, not actually used
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* @buf: where to get the data from
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* @count: bytes sent
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* @ppos: where to start - must be 0
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* @rule_list: the list of rules to write to
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* @rule_lock: lock for the rule list
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*
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* Get one smack access rule from above.
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* The format is exactly:
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* char subject[SMK_LABELLEN]
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* char object[SMK_LABELLEN]
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* char access[SMK_ACCESSLEN]
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*
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* writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
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*/
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static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos,
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struct list_head *rule_list,
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struct mutex *rule_lock)
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{
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struct smack_master_list *smlp;
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struct smack_known *skp;
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struct smack_rule *rule;
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char *data;
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int rc = -EINVAL;
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int load = 0;
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/*
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* No partial writes.
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* Enough data must be present.
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*/
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if (*ppos != 0)
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return -EINVAL;
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/*
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* Minor hack for backward compatibility
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*/
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if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN)
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return -EINVAL;
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data = kzalloc(SMK_LOADLEN, GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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if (copy_from_user(data, buf, count) != 0) {
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rc = -EFAULT;
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goto out;
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}
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/*
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* More on the minor hack for backward compatibility
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*/
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if (count == (SMK_OLOADLEN))
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data[SMK_OLOADLEN] = '-';
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rule = kzalloc(sizeof(*rule), GFP_KERNEL);
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if (rule == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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if (smk_parse_rule(data, rule, 1))
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goto out_free_rule;
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if (rule_list == NULL) {
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load = 1;
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skp = smk_find_entry(rule->smk_subject);
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rule_list = &skp->smk_rules;
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rule_lock = &skp->smk_rules_lock;
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}
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rc = count;
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/*
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* If this is "load" as opposed to "load-self" and a new rule
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* it needs to get added for reporting.
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* smk_set_access returns true if there was already a rule
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* for the subject/object pair, and false if it was new.
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*/
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if (load && !smk_set_access(rule, rule_list, rule_lock)) {
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smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
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if (smlp != NULL) {
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smlp->smk_rule = rule;
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list_add_rcu(&smlp->list, &smack_rule_list);
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} else
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rc = -ENOMEM;
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goto out;
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}
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out_free_rule:
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kfree(rule);
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out:
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kfree(data);
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return rc;
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}
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/*
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* Core logic for smackfs seq list operations.
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*/
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static void *smk_seq_start(struct seq_file *s, loff_t *pos,
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struct list_head *head)
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{
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struct list_head *list;
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/*
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* This is 0 the first time through.
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*/
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if (s->index == 0)
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s->private = head;
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if (s->private == NULL)
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return NULL;
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list = s->private;
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if (list_empty(list))
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return NULL;
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if (s->index == 0)
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return list->next;
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return list;
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}
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static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
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struct list_head *head)
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{
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struct list_head *list = v;
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if (list_is_last(list, head)) {
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s->private = NULL;
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return NULL;
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}
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s->private = list->next;
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return list->next;
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}
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static void smk_seq_stop(struct seq_file *s, void *v)
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{
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/* No-op */
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}
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/*
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* Seq_file read operations for /smack/load
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*/
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static void *load_seq_start(struct seq_file *s, loff_t *pos)
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{
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return smk_seq_start(s, pos, &smack_rule_list);
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}
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static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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return smk_seq_next(s, v, pos, &smack_rule_list);
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}
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static int load_seq_show(struct seq_file *s, void *v)
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{
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struct list_head *list = v;
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struct smack_master_list *smlp =
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list_entry(list, struct smack_master_list, list);
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struct smack_rule *srp = smlp->smk_rule;
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seq_printf(s, "%s %s", (char *)srp->smk_subject,
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(char *)srp->smk_object);
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seq_putc(s, ' ');
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if (srp->smk_access & MAY_READ)
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seq_putc(s, 'r');
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if (srp->smk_access & MAY_WRITE)
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seq_putc(s, 'w');
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if (srp->smk_access & MAY_EXEC)
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seq_putc(s, 'x');
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if (srp->smk_access & MAY_APPEND)
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seq_putc(s, 'a');
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if (srp->smk_access & MAY_TRANSMUTE)
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seq_putc(s, 't');
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if (srp->smk_access == 0)
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seq_putc(s, '-');
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seq_putc(s, '\n');
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return 0;
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}
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static const struct seq_operations load_seq_ops = {
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.start = load_seq_start,
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.next = load_seq_next,
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.show = load_seq_show,
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.stop = smk_seq_stop,
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};
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/**
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* smk_open_load - open() for /smack/load
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* @inode: inode structure representing file
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* @file: "load" file pointer
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*
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* For reading, use load_seq_* seq_file reading operations.
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*/
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static int smk_open_load(struct inode *inode, struct file *file)
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{
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return seq_open(file, &load_seq_ops);
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}
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|
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/**
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* smk_write_load - write() for /smack/load
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* @file: file pointer, not actually used
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* @buf: where to get the data from
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* @count: bytes sent
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* @ppos: where to start - must be 0
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*
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*/
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static ssize_t smk_write_load(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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/*
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* Must have privilege.
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* No partial writes.
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* Enough data must be present.
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*/
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if (!capable(CAP_MAC_ADMIN))
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return -EPERM;
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return smk_write_load_list(file, buf, count, ppos, NULL, NULL);
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}
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static const struct file_operations smk_load_ops = {
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.open = smk_open_load,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = smk_write_load,
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.release = seq_release,
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};
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|
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/**
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* smk_cipso_doi - initialize the CIPSO domain
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*/
|
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static void smk_cipso_doi(void)
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{
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int rc;
|
|
struct cipso_v4_doi *doip;
|
|
struct netlbl_audit nai;
|
|
|
|
smk_netlabel_audit_set(&nai);
|
|
|
|
rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d remove rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
|
|
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
|
|
if (doip == NULL)
|
|
panic("smack: Failed to initialize cipso DOI.\n");
|
|
doip->map.std = NULL;
|
|
doip->doi = smk_cipso_doi_value;
|
|
doip->type = CIPSO_V4_MAP_PASS;
|
|
doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
|
|
for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
|
|
doip->tags[rc] = CIPSO_V4_TAG_INVALID;
|
|
|
|
rc = netlbl_cfg_cipsov4_add(doip, &nai);
|
|
if (rc != 0) {
|
|
printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
kfree(doip);
|
|
return;
|
|
}
|
|
rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
|
|
if (rc != 0) {
|
|
printk(KERN_WARNING "%s:%d map add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
kfree(doip);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* smk_unlbl_ambient - initialize the unlabeled domain
|
|
* @oldambient: previous domain string
|
|
*/
|
|
static void smk_unlbl_ambient(char *oldambient)
|
|
{
|
|
int rc;
|
|
struct netlbl_audit nai;
|
|
|
|
smk_netlabel_audit_set(&nai);
|
|
|
|
if (oldambient != NULL) {
|
|
rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d remove rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
}
|
|
|
|
rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
|
|
NULL, NULL, &nai);
|
|
if (rc != 0)
|
|
printk(KERN_WARNING "%s:%d add rc = %d\n",
|
|
__func__, __LINE__, rc);
|
|
}
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/cipso
|
|
*/
|
|
|
|
static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smack_known_list);
|
|
}
|
|
|
|
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smack_known_list);
|
|
}
|
|
|
|
/*
|
|
* Print cipso labels in format:
|
|
* label level[/cat[,cat]]
|
|
*/
|
|
static int cipso_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_known *skp =
|
|
list_entry(list, struct smack_known, list);
|
|
struct smack_cipso *scp = skp->smk_cipso;
|
|
char *cbp;
|
|
char sep = '/';
|
|
int cat = 1;
|
|
int i;
|
|
unsigned char m;
|
|
|
|
if (scp == NULL)
|
|
return 0;
|
|
|
|
seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
|
|
|
|
cbp = scp->smk_catset;
|
|
for (i = 0; i < SMK_LABELLEN; i++)
|
|
for (m = 0x80; m != 0; m >>= 1) {
|
|
if (m & cbp[i]) {
|
|
seq_printf(s, "%c%d", sep, cat);
|
|
sep = ',';
|
|
}
|
|
cat++;
|
|
}
|
|
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations cipso_seq_ops = {
|
|
.start = cipso_seq_start,
|
|
.next = cipso_seq_next,
|
|
.show = cipso_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_cipso - open() for /smack/cipso
|
|
* @inode: inode structure representing file
|
|
* @file: "cipso" file pointer
|
|
*
|
|
* Connect our cipso_seq_* operations with /smack/cipso
|
|
* file_operations
|
|
*/
|
|
static int smk_open_cipso(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &cipso_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_cipso - write() for /smack/cipso
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Accepts only one cipso rule per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smack_known *skp;
|
|
struct smack_cipso *scp = NULL;
|
|
char mapcatset[SMK_LABELLEN];
|
|
int maplevel;
|
|
int cat;
|
|
int catlen;
|
|
ssize_t rc = -EINVAL;
|
|
char *data = NULL;
|
|
char *rule;
|
|
int ret;
|
|
int i;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
|
|
return -EINVAL;
|
|
|
|
data = kzalloc(count + 1, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(data, buf, count) != 0) {
|
|
rc = -EFAULT;
|
|
goto unlockedout;
|
|
}
|
|
|
|
/* labels cannot begin with a '-' */
|
|
if (data[0] == '-') {
|
|
rc = -EINVAL;
|
|
goto unlockedout;
|
|
}
|
|
data[count] = '\0';
|
|
rule = data;
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smack_cipso_lock);
|
|
|
|
skp = smk_import_entry(rule, 0);
|
|
if (skp == NULL)
|
|
goto out;
|
|
|
|
rule += SMK_LABELLEN;
|
|
ret = sscanf(rule, "%d", &maplevel);
|
|
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
|
|
goto out;
|
|
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &catlen);
|
|
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
|
|
goto out;
|
|
|
|
if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
|
|
goto out;
|
|
|
|
memset(mapcatset, 0, sizeof(mapcatset));
|
|
|
|
for (i = 0; i < catlen; i++) {
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &cat);
|
|
if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
|
|
goto out;
|
|
|
|
smack_catset_bit(cat, mapcatset);
|
|
}
|
|
|
|
if (skp->smk_cipso == NULL) {
|
|
scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
|
|
if (scp == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
spin_lock_bh(&skp->smk_cipsolock);
|
|
|
|
if (scp == NULL)
|
|
scp = skp->smk_cipso;
|
|
else
|
|
skp->smk_cipso = scp;
|
|
|
|
scp->smk_level = maplevel;
|
|
memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
|
|
|
|
spin_unlock_bh(&skp->smk_cipsolock);
|
|
|
|
rc = count;
|
|
out:
|
|
mutex_unlock(&smack_cipso_lock);
|
|
unlockedout:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_cipso_ops = {
|
|
.open = smk_open_cipso,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_cipso,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/netlabel
|
|
*/
|
|
|
|
static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smk_netlbladdr_list);
|
|
}
|
|
|
|
static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
|
|
}
|
|
#define BEBITS (sizeof(__be32) * 8)
|
|
|
|
/*
|
|
* Print host/label pairs
|
|
*/
|
|
static int netlbladdr_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smk_netlbladdr *skp =
|
|
list_entry(list, struct smk_netlbladdr, list);
|
|
unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
|
|
int maskn;
|
|
u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
|
|
|
|
for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
|
|
|
|
seq_printf(s, "%u.%u.%u.%u/%d %s\n",
|
|
hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations netlbladdr_seq_ops = {
|
|
.start = netlbladdr_seq_start,
|
|
.next = netlbladdr_seq_next,
|
|
.show = netlbladdr_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_netlbladdr - open() for /smack/netlabel
|
|
* @inode: inode structure representing file
|
|
* @file: "netlabel" file pointer
|
|
*
|
|
* Connect our netlbladdr_seq_* operations with /smack/netlabel
|
|
* file_operations
|
|
*/
|
|
static int smk_open_netlbladdr(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &netlbladdr_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_netlbladdr_insert
|
|
* @new : netlabel to insert
|
|
*
|
|
* This helper insert netlabel in the smack_netlbladdrs list
|
|
* sorted by netmask length (longest to smallest)
|
|
* locked by &smk_netlbladdr_lock in smk_write_netlbladdr
|
|
*
|
|
*/
|
|
static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
|
|
{
|
|
struct smk_netlbladdr *m, *m_next;
|
|
|
|
if (list_empty(&smk_netlbladdr_list)) {
|
|
list_add_rcu(&new->list, &smk_netlbladdr_list);
|
|
return;
|
|
}
|
|
|
|
m = list_entry_rcu(smk_netlbladdr_list.next,
|
|
struct smk_netlbladdr, list);
|
|
|
|
/* the comparison '>' is a bit hacky, but works */
|
|
if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
|
|
list_add_rcu(&new->list, &smk_netlbladdr_list);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
|
|
if (list_is_last(&m->list, &smk_netlbladdr_list)) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
m_next = list_entry_rcu(m->list.next,
|
|
struct smk_netlbladdr, list);
|
|
if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* smk_write_netlbladdr - write() for /smack/netlabel
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Accepts only one netlbladdr per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smk_netlbladdr *skp;
|
|
struct sockaddr_in newname;
|
|
char smack[SMK_LABELLEN];
|
|
char *sp;
|
|
char data[SMK_NETLBLADDRMAX + 1];
|
|
char *host = (char *)&newname.sin_addr.s_addr;
|
|
int rc;
|
|
struct netlbl_audit audit_info;
|
|
struct in_addr mask;
|
|
unsigned int m;
|
|
int found;
|
|
u32 mask_bits = (1<<31);
|
|
__be32 nsa;
|
|
u32 temp_mask;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
* "<addr/mask, as a.b.c.d/e><space><label>"
|
|
* "<addr, as a.b.c.d><space><label>"
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX)
|
|
return -EINVAL;
|
|
if (copy_from_user(data, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
data[count] = '\0';
|
|
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
|
|
&host[0], &host[1], &host[2], &host[3], &m, smack);
|
|
if (rc != 6) {
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
|
|
&host[0], &host[1], &host[2], &host[3], smack);
|
|
if (rc != 5)
|
|
return -EINVAL;
|
|
m = BEBITS;
|
|
}
|
|
if (m > BEBITS)
|
|
return -EINVAL;
|
|
|
|
/* if smack begins with '-', its an option, don't import it */
|
|
if (smack[0] != '-') {
|
|
sp = smk_import(smack, 0);
|
|
if (sp == NULL)
|
|
return -EINVAL;
|
|
} else {
|
|
/* check known options */
|
|
if (strcmp(smack, smack_cipso_option) == 0)
|
|
sp = (char *)smack_cipso_option;
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (temp_mask = 0; m > 0; m--) {
|
|
temp_mask |= mask_bits;
|
|
mask_bits >>= 1;
|
|
}
|
|
mask.s_addr = cpu_to_be32(temp_mask);
|
|
|
|
newname.sin_addr.s_addr &= mask.s_addr;
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smk_netlbladdr_lock);
|
|
|
|
nsa = newname.sin_addr.s_addr;
|
|
/* try to find if the prefix is already in the list */
|
|
found = 0;
|
|
list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
|
|
if (skp->smk_host.sin_addr.s_addr == nsa &&
|
|
skp->smk_mask.s_addr == mask.s_addr) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
smk_netlabel_audit_set(&audit_info);
|
|
|
|
if (found == 0) {
|
|
skp = kzalloc(sizeof(*skp), GFP_KERNEL);
|
|
if (skp == NULL)
|
|
rc = -ENOMEM;
|
|
else {
|
|
rc = 0;
|
|
skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
|
|
skp->smk_mask.s_addr = mask.s_addr;
|
|
skp->smk_label = sp;
|
|
smk_netlbladdr_insert(skp);
|
|
}
|
|
} else {
|
|
/* we delete the unlabeled entry, only if the previous label
|
|
* wasn't the special CIPSO option */
|
|
if (skp->smk_label != smack_cipso_option)
|
|
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
|
|
&skp->smk_host.sin_addr, &skp->smk_mask,
|
|
PF_INET, &audit_info);
|
|
else
|
|
rc = 0;
|
|
skp->smk_label = sp;
|
|
}
|
|
|
|
/*
|
|
* Now tell netlabel about the single label nature of
|
|
* this host so that incoming packets get labeled.
|
|
* but only if we didn't get the special CIPSO option
|
|
*/
|
|
if (rc == 0 && sp != smack_cipso_option)
|
|
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
|
|
&skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
|
|
smack_to_secid(skp->smk_label), &audit_info);
|
|
|
|
if (rc == 0)
|
|
rc = count;
|
|
|
|
mutex_unlock(&smk_netlbladdr_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_netlbladdr_ops = {
|
|
.open = smk_open_netlbladdr,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_netlbladdr,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_read_doi - read() for /smack/doi
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @count: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_doi(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
ssize_t rc;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(temp, "%d", smk_cipso_doi_value);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_doi - write() for /smack/doi
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_doi(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smk_cipso_doi_value = i;
|
|
|
|
smk_cipso_doi();
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_doi_ops = {
|
|
.read = smk_read_doi,
|
|
.write = smk_write_doi,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_direct - read() for /smack/direct
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @count: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_direct(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
ssize_t rc;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(temp, "%d", smack_cipso_direct);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_direct - write() for /smack/direct
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_direct(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smack_cipso_direct = i;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_direct_ops = {
|
|
.read = smk_read_direct,
|
|
.write = smk_write_direct,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_ambient - read() for /smack/ambient
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
ssize_t rc;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
/*
|
|
* Being careful to avoid a problem in the case where
|
|
* smack_net_ambient gets changed in midstream.
|
|
*/
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
asize = strlen(smack_net_ambient) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos,
|
|
smack_net_ambient, asize);
|
|
else
|
|
rc = -EINVAL;
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_ambient - write() for /smack/ambient
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *oldambient;
|
|
char *smack;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
smack = smk_import(in, count);
|
|
if (smack == NULL)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
oldambient = smack_net_ambient;
|
|
smack_net_ambient = smack;
|
|
smk_unlbl_ambient(oldambient);
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_ambient_ops = {
|
|
.read = smk_read_ambient,
|
|
.write = smk_write_ambient,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_onlycap - read() for /smack/onlycap
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
char *smack = "";
|
|
ssize_t rc = -EINVAL;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
if (smack_onlycap != NULL)
|
|
smack = smack_onlycap;
|
|
|
|
asize = strlen(smack) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_onlycap - write() for /smack/onlycap
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *sp = smk_of_task(current->cred->security);
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* This can be done using smk_access() but is done
|
|
* explicitly for clarity. The smk_access() implementation
|
|
* would use smk_access(smack_onlycap, MAY_WRITE)
|
|
*/
|
|
if (smack_onlycap != NULL && smack_onlycap != sp)
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Should the null string be passed in unset the onlycap value.
|
|
* This seems like something to be careful with as usually
|
|
* smk_import only expects to return NULL for errors. It
|
|
* is usually the case that a nullstring or "\n" would be
|
|
* bad to pass to smk_import but in fact this is useful here.
|
|
*/
|
|
smack_onlycap = smk_import(in, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_onlycap_ops = {
|
|
.read = smk_read_onlycap,
|
|
.write = smk_write_onlycap,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_logging - read() for /smack/logging
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_logging(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[32];
|
|
ssize_t rc;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(temp, "%d\n", log_policy);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_logging - write() for /smack/logging
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_logging(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[32];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
if (i < 0 || i > 3)
|
|
return -EINVAL;
|
|
log_policy = i;
|
|
return count;
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations smk_logging_ops = {
|
|
.read = smk_read_logging,
|
|
.write = smk_write_logging,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/load-self
|
|
*/
|
|
|
|
static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = current_security();
|
|
|
|
return smk_seq_start(s, pos, &tsp->smk_rules);
|
|
}
|
|
|
|
static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = current_security();
|
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_rules);
|
|
}
|
|
|
|
static int load_self_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_rule *srp =
|
|
list_entry(list, struct smack_rule, list);
|
|
|
|
seq_printf(s, "%s %s", (char *)srp->smk_subject,
|
|
(char *)srp->smk_object);
|
|
|
|
seq_putc(s, ' ');
|
|
|
|
if (srp->smk_access & MAY_READ)
|
|
seq_putc(s, 'r');
|
|
if (srp->smk_access & MAY_WRITE)
|
|
seq_putc(s, 'w');
|
|
if (srp->smk_access & MAY_EXEC)
|
|
seq_putc(s, 'x');
|
|
if (srp->smk_access & MAY_APPEND)
|
|
seq_putc(s, 'a');
|
|
if (srp->smk_access & MAY_TRANSMUTE)
|
|
seq_putc(s, 't');
|
|
if (srp->smk_access == 0)
|
|
seq_putc(s, '-');
|
|
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations load_self_seq_ops = {
|
|
.start = load_self_seq_start,
|
|
.next = load_self_seq_next,
|
|
.show = load_self_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
|
|
/**
|
|
* smk_open_load_self - open() for /smack/load-self
|
|
* @inode: inode structure representing file
|
|
* @file: "load" file pointer
|
|
*
|
|
* For reading, use load_seq_* seq_file reading operations.
|
|
*/
|
|
static int smk_open_load_self(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &load_self_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_load_self - write() for /smack/load-self
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*
|
|
*/
|
|
static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_smack *tsp = current_security();
|
|
|
|
return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
|
|
&tsp->smk_rules_lock);
|
|
}
|
|
|
|
static const struct file_operations smk_load_self_ops = {
|
|
.open = smk_open_load_self,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_load_self,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_write_access - handle access check transaction
|
|
* @file: file pointer
|
|
* @buf: data from user space
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*/
|
|
static ssize_t smk_write_access(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smack_rule rule;
|
|
char *data;
|
|
int res;
|
|
|
|
data = simple_transaction_get(file, buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (count < SMK_LOADLEN || smk_parse_rule(data, &rule, 0))
|
|
return -EINVAL;
|
|
|
|
res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
|
|
NULL);
|
|
data[0] = res == 0 ? '1' : '0';
|
|
data[1] = '\0';
|
|
|
|
simple_transaction_set(file, 2);
|
|
return SMK_LOADLEN;
|
|
}
|
|
|
|
static const struct file_operations smk_access_ops = {
|
|
.write = smk_write_access,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_fill_super - fill the /smackfs superblock
|
|
* @sb: the empty superblock
|
|
* @data: unused
|
|
* @silent: unused
|
|
*
|
|
* Fill in the well known entries for /smack
|
|
*
|
|
* Returns 0 on success, an error code on failure
|
|
*/
|
|
static int smk_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
int rc;
|
|
struct inode *root_inode;
|
|
|
|
static struct tree_descr smack_files[] = {
|
|
[SMK_LOAD] = {
|
|
"load", &smk_load_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_CIPSO] = {
|
|
"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DOI] = {
|
|
"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DIRECT] = {
|
|
"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_AMBIENT] = {
|
|
"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_NETLBLADDR] = {
|
|
"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_ONLYCAP] = {
|
|
"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_LOGGING] = {
|
|
"logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_LOAD_SELF] = {
|
|
"load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
|
|
[SMK_ACCESSES] = {
|
|
"access", &smk_access_ops, S_IRUGO|S_IWUGO},
|
|
/* last one */
|
|
{""}
|
|
};
|
|
|
|
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
|
|
if (rc != 0) {
|
|
printk(KERN_ERR "%s failed %d while creating inodes\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
root_inode = sb->s_root->d_inode;
|
|
root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* smk_mount - get the smackfs superblock
|
|
* @fs_type: passed along without comment
|
|
* @flags: passed along without comment
|
|
* @dev_name: passed along without comment
|
|
* @data: passed along without comment
|
|
*
|
|
* Just passes everything along.
|
|
*
|
|
* Returns what the lower level code does.
|
|
*/
|
|
static struct dentry *smk_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return mount_single(fs_type, flags, data, smk_fill_super);
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}
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static struct file_system_type smk_fs_type = {
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.name = "smackfs",
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.mount = smk_mount,
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.kill_sb = kill_litter_super,
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};
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static struct vfsmount *smackfs_mount;
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/**
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* init_smk_fs - get the smackfs superblock
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*
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* register the smackfs
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*
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* Do not register smackfs if Smack wasn't enabled
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* on boot. We can not put this method normally under the
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* smack_init() code path since the security subsystem get
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* initialized before the vfs caches.
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*
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* Returns true if we were not chosen on boot or if
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* we were chosen and filesystem registration succeeded.
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*/
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static int __init init_smk_fs(void)
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{
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int err;
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|
|
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if (!security_module_enable(&smack_ops))
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return 0;
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|
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err = register_filesystem(&smk_fs_type);
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if (!err) {
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smackfs_mount = kern_mount(&smk_fs_type);
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if (IS_ERR(smackfs_mount)) {
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printk(KERN_ERR "smackfs: could not mount!\n");
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err = PTR_ERR(smackfs_mount);
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smackfs_mount = NULL;
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}
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}
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|
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smk_cipso_doi();
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smk_unlbl_ambient(NULL);
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|
|
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mutex_init(&smack_known_floor.smk_rules_lock);
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mutex_init(&smack_known_hat.smk_rules_lock);
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mutex_init(&smack_known_huh.smk_rules_lock);
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|
mutex_init(&smack_known_invalid.smk_rules_lock);
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|
mutex_init(&smack_known_star.smk_rules_lock);
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mutex_init(&smack_known_web.smk_rules_lock);
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|
|
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INIT_LIST_HEAD(&smack_known_floor.smk_rules);
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INIT_LIST_HEAD(&smack_known_hat.smk_rules);
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|
INIT_LIST_HEAD(&smack_known_huh.smk_rules);
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|
INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
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|
INIT_LIST_HEAD(&smack_known_star.smk_rules);
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|
INIT_LIST_HEAD(&smack_known_web.smk_rules);
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|
|
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return err;
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|
}
|
|
|
|
__initcall(init_smk_fs);
|