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![Sabyrzhan Tasbolatov](/assets/img/avatar_default.png)
syzbot found WARNINGs in several smackfs write operations where bytes count is passed to memdup_user_nul which exceeds GFP MAX_ORDER. Check count size if bigger than PAGE_SIZE. Per smackfs doc, smk_write_net4addr accepts any label or -CIPSO, smk_write_net6addr accepts any label or -DELETE. I couldn't find any general rule for other label lengths except SMK_LABELLEN, SMK_LONGLABEL, SMK_CIPSOMAX which are documented. Let's constrain, in general, smackfs label lengths for PAGE_SIZE. Although fuzzer crashes write to smackfs/netlabel on 0x400000 length. Here is a quick way to reproduce the WARNING: python -c "print('A' * 0x400000)" > /sys/fs/smackfs/netlabel Reported-by: syzbot+a71a442385a0b2815497@syzkaller.appspotmail.com Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
3032 lines
69 KiB
C
3032 lines
69 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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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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#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/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 <linux/magic.h>
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#include <linux/fs_context.h>
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#include "smack.h"
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#define BEBITS (sizeof(__be32) * 8)
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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_NET4ADDR = 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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SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
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SMK_LOAD2 = 14, /* load policy with long labels */
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SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
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SMK_ACCESS2 = 16, /* make an access check with long labels */
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SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
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SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
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SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
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SMK_SYSLOG = 20, /* change syslog label) */
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SMK_PTRACE = 21, /* set ptrace rule */
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP
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SMK_UNCONFINED = 22, /* define an unconfined label */
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
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SMK_NET6ADDR = 23, /* single label IPv6 hosts */
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#endif /* CONFIG_IPV6 */
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SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
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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_cipso_lock);
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static DEFINE_MUTEX(smack_ambient_lock);
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static DEFINE_MUTEX(smk_net4addr_lock);
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#if IS_ENABLED(CONFIG_IPV6)
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static DEFINE_MUTEX(smk_net6addr_lock);
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#endif /* CONFIG_IPV6 */
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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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struct smack_known *smack_net_ambient;
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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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* This is the level in a CIPSO header that indicates a
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* secid is contained directly in the category set.
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* It can be reset via smackfs/mapped
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*/
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int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP
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/*
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* Allow one label to be unconfined. This is for
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* debugging and application bring-up purposes only.
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* It is bad and wrong, but everyone seems to expect
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* to have it.
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*/
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struct smack_known *smack_unconfined;
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#endif
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/*
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* If this value is set restrict syslog use to the label specified.
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* It can be reset via smackfs/syslog
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*/
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struct smack_known *smack_syslog_label;
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/*
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* Ptrace current rule
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* SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
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* SMACK_PTRACE_EXACT labels must match, but can be overriden with
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* CAP_SYS_PTRACE
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* SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
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*/
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int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
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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_net4addr_list);
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#if IS_ENABLED(CONFIG_IPV6)
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LIST_HEAD(smk_net6addr_list);
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#endif /* CONFIG_IPV6 */
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/*
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* Rule lists are maintained for each label.
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*/
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struct smack_parsed_rule {
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struct smack_known *smk_subject;
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struct smack_known *smk_object;
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int smk_access1;
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int smk_access2;
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};
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static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
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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 "rwxatl"
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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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* Stricly for CIPSO level manipulation.
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* Set the category bit number in a smack label sized buffer.
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*/
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static inline void smack_catset_bit(unsigned int cat, char *catsetp)
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{
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if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
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return;
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catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
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}
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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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struct smack_known *skp = smk_of_current();
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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 = skp->smk_secid;
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}
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/*
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* Value for parsing single label host rules
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* "1.2.3.4 X"
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*/
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#define SMK_NETLBLADDRMIN 9
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/**
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* smk_set_access - add a rule to the rule list or replace an old rule
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* @srp: the rule to add or replace
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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 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_parsed_rule *srp,
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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_rule *sp;
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int found = 0;
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int rc = 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_access1;
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sp->smk_access &= ~srp->smk_access2;
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break;
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}
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}
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if (found == 0) {
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sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
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if (sp == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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sp->smk_subject = srp->smk_subject;
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sp->smk_object = srp->smk_object;
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sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
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list_add_rcu(&sp->list, rule_list);
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}
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out:
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mutex_unlock(rule_lock);
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return rc;
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}
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/**
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* smk_perm_from_str - parse smack accesses from a text string
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* @string: a text string that contains a Smack accesses code
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*
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* Returns an integer with respective bits set for specified accesses.
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*/
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static int smk_perm_from_str(const char *string)
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{
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int perm = 0;
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const char *cp;
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for (cp = string; ; cp++)
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switch (*cp) {
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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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perm |= MAY_READ;
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break;
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case 'w':
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case 'W':
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perm |= MAY_WRITE;
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break;
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case 'x':
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case 'X':
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perm |= MAY_EXEC;
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break;
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case 'a':
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case 'A':
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perm |= MAY_APPEND;
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break;
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case 't':
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case 'T':
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perm |= MAY_TRANSMUTE;
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break;
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case 'l':
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case 'L':
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perm |= MAY_LOCK;
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break;
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case 'b':
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case 'B':
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perm |= MAY_BRINGUP;
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break;
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default:
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return perm;
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}
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}
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/**
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* smk_fill_rule - Fill Smack rule from strings
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* @subject: subject label string
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* @object: object label string
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* @access1: access string
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* @access2: string with permissions to be removed
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* @rule: Smack rule
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* @import: if non-zero, import labels
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* @len: label length limit
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*
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* Returns 0 on success, appropriate error code on failure.
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*/
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static int smk_fill_rule(const char *subject, const char *object,
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const char *access1, const char *access2,
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struct smack_parsed_rule *rule, int import,
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int len)
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{
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const char *cp;
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struct smack_known *skp;
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if (import) {
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rule->smk_subject = smk_import_entry(subject, len);
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if (IS_ERR(rule->smk_subject))
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return PTR_ERR(rule->smk_subject);
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rule->smk_object = smk_import_entry(object, len);
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if (IS_ERR(rule->smk_object))
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return PTR_ERR(rule->smk_object);
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} else {
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cp = smk_parse_smack(subject, len);
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if (IS_ERR(cp))
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return PTR_ERR(cp);
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skp = smk_find_entry(cp);
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kfree(cp);
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if (skp == NULL)
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return -ENOENT;
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rule->smk_subject = skp;
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cp = smk_parse_smack(object, len);
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if (IS_ERR(cp))
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return PTR_ERR(cp);
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skp = smk_find_entry(cp);
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kfree(cp);
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if (skp == NULL)
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return -ENOENT;
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rule->smk_object = skp;
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}
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rule->smk_access1 = smk_perm_from_str(access1);
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if (access2)
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rule->smk_access2 = smk_perm_from_str(access2);
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else
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rule->smk_access2 = ~rule->smk_access1;
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return 0;
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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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* Returns 0 on success, -1 on errors.
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*/
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static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
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int import)
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{
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int rc;
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rc = smk_fill_rule(data, data + SMK_LABELLEN,
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data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
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import, SMK_LABELLEN);
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return rc;
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}
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/**
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* smk_parse_long_rule - parse Smack rule from rule string
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* @data: string to be parsed, null terminated
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* @rule: Will be filled with Smack parsed rule
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* @import: if non-zero, import labels
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* @tokens: numer of substrings expected in data
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*
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* Returns number of processed bytes on success, -ERRNO on failure.
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*/
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static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
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int import, int tokens)
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{
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ssize_t cnt = 0;
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char *tok[4];
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int rc;
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int i;
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/*
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* Parsing the rule in-place, filling all white-spaces with '\0'
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*/
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for (i = 0; i < tokens; ++i) {
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while (isspace(data[cnt]))
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data[cnt++] = '\0';
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|
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if (data[cnt] == '\0')
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/* Unexpected end of data */
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return -EINVAL;
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tok[i] = data + cnt;
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|
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while (data[cnt] && !isspace(data[cnt]))
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++cnt;
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}
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while (isspace(data[cnt]))
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data[cnt++] = '\0';
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|
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while (i < 4)
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tok[i++] = NULL;
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|
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rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
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return rc == 0 ? cnt : rc;
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}
|
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|
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#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
|
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#define SMK_LONG_FMT 1 /* Variable long label format */
|
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#define SMK_CHANGE_FMT 2 /* Rule modification format */
|
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/**
|
|
* smk_write_rules_list - write() for any /smack rule file
|
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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
|
|
* @format: /smack/load or /smack/load2 or /smack/change-rule format.
|
|
*
|
|
* Get one smack access rule from above.
|
|
* The format for SMK_LONG_FMT is:
|
|
* "subject<whitespace>object<whitespace>access[<whitespace>...]"
|
|
* The format for SMK_FIXED24_FMT is exactly:
|
|
* "subject object rwxat"
|
|
* The format for SMK_CHANGE_FMT is:
|
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* "subject<whitespace>object<whitespace>
|
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* acc_enable<whitespace>acc_disable[<whitespace>...]"
|
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*/
|
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static ssize_t smk_write_rules_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, int format)
|
|
{
|
|
struct smack_parsed_rule rule;
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char *data;
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int rc;
|
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int trunc = 0;
|
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int tokens;
|
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ssize_t cnt = 0;
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|
|
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/*
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
*/
|
|
if (*ppos != 0)
|
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return -EINVAL;
|
|
|
|
if (format == SMK_FIXED24_FMT) {
|
|
/*
|
|
* Minor hack for backward compatibility
|
|
*/
|
|
if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
|
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return -EINVAL;
|
|
} else {
|
|
if (count >= PAGE_SIZE) {
|
|
count = PAGE_SIZE - 1;
|
|
trunc = 1;
|
|
}
|
|
}
|
|
|
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data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
/*
|
|
* In case of parsing only part of user buf,
|
|
* avoid having partial rule at the data buffer
|
|
*/
|
|
if (trunc) {
|
|
while (count > 0 && (data[count - 1] != '\n'))
|
|
--count;
|
|
if (count == 0) {
|
|
rc = -EINVAL;
|
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goto out;
|
|
}
|
|
}
|
|
|
|
data[count] = '\0';
|
|
tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
|
|
while (cnt < count) {
|
|
if (format == SMK_FIXED24_FMT) {
|
|
rc = smk_parse_rule(data, &rule, 1);
|
|
if (rc < 0)
|
|
goto out;
|
|
cnt = count;
|
|
} else {
|
|
rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
|
|
if (rc < 0)
|
|
goto out;
|
|
if (rc == 0) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
cnt += rc;
|
|
}
|
|
|
|
if (rule_list == NULL)
|
|
rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
|
|
&rule.smk_subject->smk_rules_lock);
|
|
else
|
|
rc = smk_set_access(&rule, rule_list, rule_lock);
|
|
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
rc = cnt;
|
|
out:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Core logic for smackfs seq list operations.
|
|
*/
|
|
|
|
static void *smk_seq_start(struct seq_file *s, loff_t *pos,
|
|
struct list_head *head)
|
|
{
|
|
struct list_head *list;
|
|
int i = *pos;
|
|
|
|
rcu_read_lock();
|
|
for (list = rcu_dereference(list_next_rcu(head));
|
|
list != head;
|
|
list = rcu_dereference(list_next_rcu(list))) {
|
|
if (i-- == 0)
|
|
return list;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
|
|
struct list_head *head)
|
|
{
|
|
struct list_head *list = v;
|
|
|
|
++*pos;
|
|
list = rcu_dereference(list_next_rcu(list));
|
|
|
|
return (list == head) ? NULL : list;
|
|
}
|
|
|
|
static void smk_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
|
|
{
|
|
/*
|
|
* Don't show any rules with label names too long for
|
|
* interface file (/smack/load or /smack/load2)
|
|
* because you should expect to be able to write
|
|
* anything you read back.
|
|
*/
|
|
if (strlen(srp->smk_subject->smk_known) >= max ||
|
|
strlen(srp->smk_object->smk_known) >= max)
|
|
return;
|
|
|
|
if (srp->smk_access == 0)
|
|
return;
|
|
|
|
seq_printf(s, "%s %s",
|
|
srp->smk_subject->smk_known,
|
|
srp->smk_object->smk_known);
|
|
|
|
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 & MAY_LOCK)
|
|
seq_putc(s, 'l');
|
|
if (srp->smk_access & MAY_BRINGUP)
|
|
seq_putc(s, 'b');
|
|
|
|
seq_putc(s, '\n');
|
|
}
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/load
|
|
*/
|
|
|
|
static void *load2_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smack_known_list);
|
|
}
|
|
|
|
static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smack_known_list);
|
|
}
|
|
|
|
static int load_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_rule *srp;
|
|
struct smack_known *skp =
|
|
list_entry_rcu(list, struct smack_known, list);
|
|
|
|
list_for_each_entry_rcu(srp, &skp->smk_rules, list)
|
|
smk_rule_show(s, srp, SMK_LABELLEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations load_seq_ops = {
|
|
.start = load2_seq_start,
|
|
.next = load2_seq_next,
|
|
.show = load_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_load - open() for /smack/load
|
|
* @inode: inode structure representing file
|
|
* @file: "load" file pointer
|
|
*
|
|
* For reading, use load_seq_* seq_file reading operations.
|
|
*/
|
|
static int smk_open_load(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &load_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_load - write() for /smack/load
|
|
* @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(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
*/
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
|
|
SMK_FIXED24_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_load_ops = {
|
|
.open = smk_open_load,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_load,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_cipso_doi - initialize the CIPSO domain
|
|
*/
|
|
static void smk_cipso_doi(void)
|
|
{
|
|
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);
|
|
}
|
|
if (smack_net_ambient == NULL)
|
|
smack_net_ambient = &smack_known_floor;
|
|
|
|
rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, 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_rcu(list, struct smack_known, list);
|
|
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
|
|
char sep = '/';
|
|
int i;
|
|
|
|
/*
|
|
* Don't show a label that could not have been set using
|
|
* /smack/cipso. This is in support of the notion that
|
|
* anything read from /smack/cipso ought to be writeable
|
|
* to /smack/cipso.
|
|
*
|
|
* /smack/cipso2 should be used instead.
|
|
*/
|
|
if (strlen(skp->smk_known) >= SMK_LABELLEN)
|
|
return 0;
|
|
|
|
seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
|
|
|
|
for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
|
|
i = netlbl_catmap_walk(cmp, i + 1)) {
|
|
seq_printf(s, "%c%d", sep, i);
|
|
sep = ',';
|
|
}
|
|
|
|
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_set_cipso - do the work for write() for cipso and cipso2
|
|
* @file: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
* @format: /smack/cipso or /smack/cipso2
|
|
*
|
|
* Accepts only one cipso rule per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos, int format)
|
|
{
|
|
struct smack_known *skp;
|
|
struct netlbl_lsm_secattr ncats;
|
|
char mapcatset[SMK_CIPSOLEN];
|
|
int maplevel;
|
|
unsigned 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 (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (format == SMK_FIXED24_FMT &&
|
|
(count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
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 (IS_ERR(skp)) {
|
|
rc = PTR_ERR(skp);
|
|
goto out;
|
|
}
|
|
|
|
if (format == SMK_FIXED24_FMT)
|
|
rule += SMK_LABELLEN;
|
|
else
|
|
rule += strlen(skp->smk_known) + 1;
|
|
|
|
if (rule > data + count) {
|
|
rc = -EOVERFLOW;
|
|
goto out;
|
|
}
|
|
|
|
ret = sscanf(rule, "%d", &maplevel);
|
|
if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
|
|
goto out;
|
|
|
|
rule += SMK_DIGITLEN;
|
|
if (rule > data + count) {
|
|
rc = -EOVERFLOW;
|
|
goto out;
|
|
}
|
|
|
|
ret = sscanf(rule, "%d", &catlen);
|
|
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
|
|
goto out;
|
|
|
|
if (format == SMK_FIXED24_FMT &&
|
|
count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
|
|
goto out;
|
|
|
|
memset(mapcatset, 0, sizeof(mapcatset));
|
|
|
|
for (i = 0; i < catlen; i++) {
|
|
rule += SMK_DIGITLEN;
|
|
if (rule > data + count) {
|
|
rc = -EOVERFLOW;
|
|
goto out;
|
|
}
|
|
ret = sscanf(rule, "%u", &cat);
|
|
if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
|
|
goto out;
|
|
|
|
smack_catset_bit(cat, mapcatset);
|
|
}
|
|
|
|
rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
|
|
if (rc >= 0) {
|
|
netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
|
|
skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
|
|
skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
|
|
rc = count;
|
|
/*
|
|
* This mapping may have been cached, so clear the cache.
|
|
*/
|
|
netlbl_cache_invalidate();
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&smack_cipso_lock);
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
|
|
}
|
|
|
|
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/cipso2
|
|
*/
|
|
|
|
/*
|
|
* Print cipso labels in format:
|
|
* label level[/cat[,cat]]
|
|
*/
|
|
static int cipso2_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_known *skp =
|
|
list_entry_rcu(list, struct smack_known, list);
|
|
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
|
|
char sep = '/';
|
|
int i;
|
|
|
|
seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
|
|
|
|
for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
|
|
i = netlbl_catmap_walk(cmp, i + 1)) {
|
|
seq_printf(s, "%c%d", sep, i);
|
|
sep = ',';
|
|
}
|
|
|
|
seq_putc(s, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations cipso2_seq_ops = {
|
|
.start = cipso_seq_start,
|
|
.next = cipso_seq_next,
|
|
.show = cipso2_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_cipso2 - open() for /smack/cipso2
|
|
* @inode: inode structure representing file
|
|
* @file: "cipso2" file pointer
|
|
*
|
|
* Connect our cipso_seq_* operations with /smack/cipso2
|
|
* file_operations
|
|
*/
|
|
static int smk_open_cipso2(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &cipso2_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_cipso2 - write() for /smack/cipso2
|
|
* @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_cipso2(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_cipso2_ops = {
|
|
.open = smk_open_cipso2,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_cipso2,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/netlabel
|
|
*/
|
|
|
|
static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smk_net4addr_list);
|
|
}
|
|
|
|
static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smk_net4addr_list);
|
|
}
|
|
|
|
/*
|
|
* Print host/label pairs
|
|
*/
|
|
static int net4addr_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smk_net4addr *skp =
|
|
list_entry_rcu(list, struct smk_net4addr, list);
|
|
char *kp = SMACK_CIPSO_OPTION;
|
|
|
|
if (skp->smk_label != NULL)
|
|
kp = skp->smk_label->smk_known;
|
|
seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
|
|
skp->smk_masks, kp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations net4addr_seq_ops = {
|
|
.start = net4addr_seq_start,
|
|
.next = net4addr_seq_next,
|
|
.show = net4addr_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_net4addr - open() for /smack/netlabel
|
|
* @inode: inode structure representing file
|
|
* @file: "netlabel" file pointer
|
|
*
|
|
* Connect our net4addr_seq_* operations with /smack/netlabel
|
|
* file_operations
|
|
*/
|
|
static int smk_open_net4addr(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &net4addr_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_net4addr_insert
|
|
* @new : netlabel to insert
|
|
*
|
|
* This helper insert netlabel in the smack_net4addrs list
|
|
* sorted by netmask length (longest to smallest)
|
|
* locked by &smk_net4addr_lock in smk_write_net4addr
|
|
*
|
|
*/
|
|
static void smk_net4addr_insert(struct smk_net4addr *new)
|
|
{
|
|
struct smk_net4addr *m;
|
|
struct smk_net4addr *m_next;
|
|
|
|
if (list_empty(&smk_net4addr_list)) {
|
|
list_add_rcu(&new->list, &smk_net4addr_list);
|
|
return;
|
|
}
|
|
|
|
m = list_entry_rcu(smk_net4addr_list.next,
|
|
struct smk_net4addr, list);
|
|
|
|
/* the comparison '>' is a bit hacky, but works */
|
|
if (new->smk_masks > m->smk_masks) {
|
|
list_add_rcu(&new->list, &smk_net4addr_list);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
|
|
if (list_is_last(&m->list, &smk_net4addr_list)) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
m_next = list_entry_rcu(m->list.next,
|
|
struct smk_net4addr, list);
|
|
if (new->smk_masks > m_next->smk_masks) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* smk_write_net4addr - 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 net4addr per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smk_net4addr *snp;
|
|
struct sockaddr_in newname;
|
|
char *smack;
|
|
struct smack_known *skp = NULL;
|
|
char *data;
|
|
char *host = (char *)&newname.sin_addr.s_addr;
|
|
int rc;
|
|
struct netlbl_audit audit_info;
|
|
struct in_addr mask;
|
|
unsigned int m;
|
|
unsigned int masks;
|
|
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 (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
smack = kzalloc(count + 1, GFP_KERNEL);
|
|
if (smack == NULL) {
|
|
rc = -ENOMEM;
|
|
goto free_data_out;
|
|
}
|
|
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
|
|
&host[0], &host[1], &host[2], &host[3], &masks, smack);
|
|
if (rc != 6) {
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
|
|
&host[0], &host[1], &host[2], &host[3], smack);
|
|
if (rc != 5) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
m = BEBITS;
|
|
masks = 32;
|
|
}
|
|
if (masks > BEBITS) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
|
|
/*
|
|
* If smack begins with '-', it is an option, don't import it
|
|
*/
|
|
if (smack[0] != '-') {
|
|
skp = smk_import_entry(smack, 0);
|
|
if (IS_ERR(skp)) {
|
|
rc = PTR_ERR(skp);
|
|
goto free_out;
|
|
}
|
|
} else {
|
|
/*
|
|
* Only the -CIPSO option is supported for IPv4
|
|
*/
|
|
if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
}
|
|
|
|
for (m = masks, 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_net4addr_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(snp, &smk_net4addr_list, list) {
|
|
if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
smk_netlabel_audit_set(&audit_info);
|
|
|
|
if (found == 0) {
|
|
snp = kzalloc(sizeof(*snp), GFP_KERNEL);
|
|
if (snp == NULL)
|
|
rc = -ENOMEM;
|
|
else {
|
|
rc = 0;
|
|
snp->smk_host.s_addr = newname.sin_addr.s_addr;
|
|
snp->smk_mask.s_addr = mask.s_addr;
|
|
snp->smk_label = skp;
|
|
snp->smk_masks = masks;
|
|
smk_net4addr_insert(snp);
|
|
}
|
|
} else {
|
|
/*
|
|
* Delete the unlabeled entry, only if the previous label
|
|
* wasn't the special CIPSO option
|
|
*/
|
|
if (snp->smk_label != NULL)
|
|
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
|
|
&snp->smk_host, &snp->smk_mask,
|
|
PF_INET, &audit_info);
|
|
else
|
|
rc = 0;
|
|
snp->smk_label = skp;
|
|
}
|
|
|
|
/*
|
|
* 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 && skp != NULL)
|
|
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
|
|
&snp->smk_host, &snp->smk_mask, PF_INET,
|
|
snp->smk_label->smk_secid, &audit_info);
|
|
|
|
if (rc == 0)
|
|
rc = count;
|
|
|
|
mutex_unlock(&smk_net4addr_lock);
|
|
|
|
free_out:
|
|
kfree(smack);
|
|
free_data_out:
|
|
kfree(data);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_net4addr_ops = {
|
|
.open = smk_open_net4addr,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_net4addr,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/*
|
|
* Seq_file read operations for /smack/netlabel6
|
|
*/
|
|
|
|
static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smk_net6addr_list);
|
|
}
|
|
|
|
static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smk_net6addr_list);
|
|
}
|
|
|
|
/*
|
|
* Print host/label pairs
|
|
*/
|
|
static int net6addr_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smk_net6addr *skp =
|
|
list_entry(list, struct smk_net6addr, list);
|
|
|
|
if (skp->smk_label != NULL)
|
|
seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
|
|
skp->smk_label->smk_known);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations net6addr_seq_ops = {
|
|
.start = net6addr_seq_start,
|
|
.next = net6addr_seq_next,
|
|
.show = net6addr_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_net6addr - open() for /smack/netlabel
|
|
* @inode: inode structure representing file
|
|
* @file: "netlabel" file pointer
|
|
*
|
|
* Connect our net6addr_seq_* operations with /smack/netlabel
|
|
* file_operations
|
|
*/
|
|
static int smk_open_net6addr(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &net6addr_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_net6addr_insert
|
|
* @new : entry to insert
|
|
*
|
|
* This inserts an entry in the smack_net6addrs list
|
|
* sorted by netmask length (longest to smallest)
|
|
* locked by &smk_net6addr_lock in smk_write_net6addr
|
|
*
|
|
*/
|
|
static void smk_net6addr_insert(struct smk_net6addr *new)
|
|
{
|
|
struct smk_net6addr *m_next;
|
|
struct smk_net6addr *m;
|
|
|
|
if (list_empty(&smk_net6addr_list)) {
|
|
list_add_rcu(&new->list, &smk_net6addr_list);
|
|
return;
|
|
}
|
|
|
|
m = list_entry_rcu(smk_net6addr_list.next,
|
|
struct smk_net6addr, list);
|
|
|
|
if (new->smk_masks > m->smk_masks) {
|
|
list_add_rcu(&new->list, &smk_net6addr_list);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
|
|
if (list_is_last(&m->list, &smk_net6addr_list)) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
m_next = list_entry_rcu(m->list.next,
|
|
struct smk_net6addr, list);
|
|
if (new->smk_masks > m_next->smk_masks) {
|
|
list_add_rcu(&new->list, &m->list);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* smk_write_net6addr - 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 net6addr per write call.
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smk_net6addr *snp;
|
|
struct in6_addr newname;
|
|
struct in6_addr fullmask;
|
|
struct smack_known *skp = NULL;
|
|
char *smack;
|
|
char *data;
|
|
int rc = 0;
|
|
int found = 0;
|
|
int i;
|
|
unsigned int scanned[8];
|
|
unsigned int m;
|
|
unsigned int mask = 128;
|
|
|
|
/*
|
|
* Must have privilege.
|
|
* No partial writes.
|
|
* Enough data must be present.
|
|
* "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
|
|
* "<addr, as a:b:c:d:e:f:g:h><space><label>"
|
|
*/
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
smack = kzalloc(count + 1, GFP_KERNEL);
|
|
if (smack == NULL) {
|
|
rc = -ENOMEM;
|
|
goto free_data_out;
|
|
}
|
|
|
|
i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
|
|
&scanned[0], &scanned[1], &scanned[2], &scanned[3],
|
|
&scanned[4], &scanned[5], &scanned[6], &scanned[7],
|
|
&mask, smack);
|
|
if (i != 10) {
|
|
i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
|
|
&scanned[0], &scanned[1], &scanned[2],
|
|
&scanned[3], &scanned[4], &scanned[5],
|
|
&scanned[6], &scanned[7], smack);
|
|
if (i != 9) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
}
|
|
if (mask > 128) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
for (i = 0; i < 8; i++) {
|
|
if (scanned[i] > 0xffff) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
newname.s6_addr16[i] = htons(scanned[i]);
|
|
}
|
|
|
|
/*
|
|
* If smack begins with '-', it is an option, don't import it
|
|
*/
|
|
if (smack[0] != '-') {
|
|
skp = smk_import_entry(smack, 0);
|
|
if (IS_ERR(skp)) {
|
|
rc = PTR_ERR(skp);
|
|
goto free_out;
|
|
}
|
|
} else {
|
|
/*
|
|
* Only -DELETE is supported for IPv6
|
|
*/
|
|
if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
|
|
rc = -EINVAL;
|
|
goto free_out;
|
|
}
|
|
}
|
|
|
|
for (i = 0, m = mask; i < 8; i++) {
|
|
if (m >= 16) {
|
|
fullmask.s6_addr16[i] = 0xffff;
|
|
m -= 16;
|
|
} else if (m > 0) {
|
|
fullmask.s6_addr16[i] = (1 << m) - 1;
|
|
m = 0;
|
|
} else
|
|
fullmask.s6_addr16[i] = 0;
|
|
newname.s6_addr16[i] &= fullmask.s6_addr16[i];
|
|
}
|
|
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smk_net6addr_lock);
|
|
/*
|
|
* Try to find the prefix in the list
|
|
*/
|
|
list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
|
|
if (mask != snp->smk_masks)
|
|
continue;
|
|
for (found = 1, i = 0; i < 8; i++) {
|
|
if (newname.s6_addr16[i] !=
|
|
snp->smk_host.s6_addr16[i]) {
|
|
found = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (found == 1)
|
|
break;
|
|
}
|
|
if (found == 0) {
|
|
snp = kzalloc(sizeof(*snp), GFP_KERNEL);
|
|
if (snp == NULL)
|
|
rc = -ENOMEM;
|
|
else {
|
|
snp->smk_host = newname;
|
|
snp->smk_mask = fullmask;
|
|
snp->smk_masks = mask;
|
|
snp->smk_label = skp;
|
|
smk_net6addr_insert(snp);
|
|
}
|
|
} else {
|
|
snp->smk_label = skp;
|
|
}
|
|
|
|
if (rc == 0)
|
|
rc = count;
|
|
|
|
mutex_unlock(&smk_net6addr_lock);
|
|
|
|
free_out:
|
|
kfree(smack);
|
|
free_data_out:
|
|
kfree(data);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_net6addr_ops = {
|
|
.open = smk_open_net6addr,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_net6addr,
|
|
.release = seq_release,
|
|
};
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
/**
|
|
* 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 (!smack_privileged(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)
|
|
{
|
|
struct smack_known *skp;
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!smack_privileged(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;
|
|
|
|
/*
|
|
* Don't do anything if the value hasn't actually changed.
|
|
* If it is changing reset the level on entries that were
|
|
* set up to be direct when they were created.
|
|
*/
|
|
if (smack_cipso_direct != i) {
|
|
mutex_lock(&smack_known_lock);
|
|
list_for_each_entry_rcu(skp, &smack_known_list, list)
|
|
if (skp->smk_netlabel.attr.mls.lvl ==
|
|
smack_cipso_direct)
|
|
skp->smk_netlabel.attr.mls.lvl = i;
|
|
smack_cipso_direct = i;
|
|
mutex_unlock(&smack_known_lock);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_direct_ops = {
|
|
.read = smk_read_direct,
|
|
.write = smk_write_direct,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_mapped - read() for /smack/mapped
|
|
* @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_mapped(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_mapped);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_mapped - write() for /smack/mapped
|
|
* @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_mapped(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct smack_known *skp;
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!smack_privileged(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;
|
|
|
|
/*
|
|
* Don't do anything if the value hasn't actually changed.
|
|
* If it is changing reset the level on entries that were
|
|
* set up to be mapped when they were created.
|
|
*/
|
|
if (smack_cipso_mapped != i) {
|
|
mutex_lock(&smack_known_lock);
|
|
list_for_each_entry_rcu(skp, &smack_known_list, list)
|
|
if (skp->smk_netlabel.attr.mls.lvl ==
|
|
smack_cipso_mapped)
|
|
skp->smk_netlabel.attr.mls.lvl = i;
|
|
smack_cipso_mapped = i;
|
|
mutex_unlock(&smack_known_lock);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_mapped_ops = {
|
|
.read = smk_read_mapped,
|
|
.write = smk_write_mapped,
|
|
.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->smk_known) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos,
|
|
smack_net_ambient->smk_known,
|
|
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)
|
|
{
|
|
struct smack_known *skp;
|
|
char *oldambient;
|
|
char *data;
|
|
int rc = count;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Enough data must be present */
|
|
if (count == 0 || count > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
skp = smk_import_entry(data, count);
|
|
if (IS_ERR(skp)) {
|
|
rc = PTR_ERR(skp);
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
oldambient = smack_net_ambient->smk_known;
|
|
smack_net_ambient = skp;
|
|
smk_unlbl_ambient(oldambient);
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
out:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_ambient_ops = {
|
|
.read = smk_read_ambient,
|
|
.write = smk_write_ambient,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/*
|
|
* Seq_file operations for /smack/onlycap
|
|
*/
|
|
static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
return smk_seq_start(s, pos, &smack_onlycap_list);
|
|
}
|
|
|
|
static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
return smk_seq_next(s, v, pos, &smack_onlycap_list);
|
|
}
|
|
|
|
static int onlycap_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_known_list_elem *sklep =
|
|
list_entry_rcu(list, struct smack_known_list_elem, list);
|
|
|
|
seq_puts(s, sklep->smk_label->smk_known);
|
|
seq_putc(s, ' ');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations onlycap_seq_ops = {
|
|
.start = onlycap_seq_start,
|
|
.next = onlycap_seq_next,
|
|
.show = onlycap_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
static int smk_open_onlycap(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &onlycap_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_list_swap_rcu - swap public list with a private one in RCU-safe way
|
|
* The caller must hold appropriate mutex to prevent concurrent modifications
|
|
* to the public list.
|
|
* Private list is assumed to be not accessible to other threads yet.
|
|
*
|
|
* @public: public list
|
|
* @private: private list
|
|
*/
|
|
static void smk_list_swap_rcu(struct list_head *public,
|
|
struct list_head *private)
|
|
{
|
|
struct list_head *first, *last;
|
|
|
|
if (list_empty(public)) {
|
|
list_splice_init_rcu(private, public, synchronize_rcu);
|
|
} else {
|
|
/* Remember public list before replacing it */
|
|
first = public->next;
|
|
last = public->prev;
|
|
|
|
/* Publish private list in place of public in RCU-safe way */
|
|
private->prev->next = public;
|
|
private->next->prev = public;
|
|
rcu_assign_pointer(public->next, private->next);
|
|
public->prev = private->prev;
|
|
|
|
synchronize_rcu();
|
|
|
|
/* When all readers are done with the old public list,
|
|
* attach it in place of private */
|
|
private->next = first;
|
|
private->prev = last;
|
|
first->prev = private;
|
|
last->next = private;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* smk_parse_label_list - parse list of Smack labels, separated by spaces
|
|
*
|
|
* @data: the string to parse
|
|
* @list: destination list
|
|
*
|
|
* Returns zero on success or error code, as appropriate
|
|
*/
|
|
static int smk_parse_label_list(char *data, struct list_head *list)
|
|
{
|
|
char *tok;
|
|
struct smack_known *skp;
|
|
struct smack_known_list_elem *sklep;
|
|
|
|
while ((tok = strsep(&data, " ")) != NULL) {
|
|
if (!*tok)
|
|
continue;
|
|
|
|
skp = smk_import_entry(tok, 0);
|
|
if (IS_ERR(skp))
|
|
return PTR_ERR(skp);
|
|
|
|
sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
|
|
if (sklep == NULL)
|
|
return -ENOMEM;
|
|
|
|
sklep->smk_label = skp;
|
|
list_add(&sklep->list, list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* smk_destroy_label_list - destroy a list of smack_known_list_elem
|
|
* @list: header pointer of the list to destroy
|
|
*/
|
|
void smk_destroy_label_list(struct list_head *list)
|
|
{
|
|
struct smack_known_list_elem *sklep;
|
|
struct smack_known_list_elem *sklep2;
|
|
|
|
list_for_each_entry_safe(sklep, sklep2, list, list)
|
|
kfree(sklep);
|
|
|
|
INIT_LIST_HEAD(list);
|
|
}
|
|
|
|
/**
|
|
* smk_write_onlycap - write() for smackfs/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 *data;
|
|
LIST_HEAD(list_tmp);
|
|
int rc;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
rc = smk_parse_label_list(data, &list_tmp);
|
|
kfree(data);
|
|
|
|
/*
|
|
* Clear the smack_onlycap on invalid label errors. This means
|
|
* that we can pass a null string to unset the onlycap value.
|
|
*
|
|
* Importing will also reject a label beginning with '-',
|
|
* so "-usecapabilities" will also work.
|
|
*
|
|
* But do so only on invalid label, not on system errors.
|
|
* The invalid label must be first to count as clearing attempt.
|
|
*/
|
|
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
|
|
mutex_lock(&smack_onlycap_lock);
|
|
smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
|
|
mutex_unlock(&smack_onlycap_lock);
|
|
rc = count;
|
|
}
|
|
|
|
smk_destroy_label_list(&list_tmp);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_onlycap_ops = {
|
|
.open = smk_open_onlycap,
|
|
.read = seq_read,
|
|
.write = smk_write_onlycap,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
|
|
/**
|
|
* smk_read_unconfined - read() for smackfs/unconfined
|
|
* @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_unconfined(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_unconfined != NULL)
|
|
smack = smack_unconfined->smk_known;
|
|
|
|
asize = strlen(smack) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_unconfined - write() for smackfs/unconfined
|
|
* @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_unconfined(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *data;
|
|
struct smack_known *skp;
|
|
int rc = count;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
/*
|
|
* Clear the smack_unconfined on invalid label errors. This means
|
|
* that we can pass a null string to unset the unconfined value.
|
|
*
|
|
* Importing will also reject a label beginning with '-',
|
|
* so "-confine" will also work.
|
|
*
|
|
* But do so only on invalid label, not on system errors.
|
|
*/
|
|
skp = smk_import_entry(data, count);
|
|
if (PTR_ERR(skp) == -EINVAL)
|
|
skp = NULL;
|
|
else if (IS_ERR(skp)) {
|
|
rc = PTR_ERR(skp);
|
|
goto freeout;
|
|
}
|
|
|
|
smack_unconfined = skp;
|
|
|
|
freeout:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_unconfined_ops = {
|
|
.read = smk_read_unconfined,
|
|
.write = smk_write_unconfined,
|
|
.llseek = default_llseek,
|
|
};
|
|
#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
|
|
|
|
/**
|
|
* smk_read_logging - read() for /smack/logging
|
|
* @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_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 (!smack_privileged(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 = smack_cred(current_cred());
|
|
|
|
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 = smack_cred(current_cred());
|
|
|
|
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_rcu(list, struct smack_rule, list);
|
|
|
|
smk_rule_show(s, srp, SMK_LABELLEN);
|
|
|
|
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-self2
|
|
* @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 = smack_cred(current_cred());
|
|
|
|
return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
|
|
&tsp->smk_rules_lock, SMK_FIXED24_FMT);
|
|
}
|
|
|
|
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_user_access - handle access check transaction
|
|
* @file: file pointer
|
|
* @buf: data from user space
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
* @format: /smack/load or /smack/load2 or /smack/change-rule format.
|
|
*/
|
|
static ssize_t smk_user_access(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos, int format)
|
|
{
|
|
struct smack_parsed_rule rule;
|
|
char *data;
|
|
int res;
|
|
|
|
data = simple_transaction_get(file, buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (format == SMK_FIXED24_FMT) {
|
|
if (count < SMK_LOADLEN)
|
|
return -EINVAL;
|
|
res = smk_parse_rule(data, &rule, 0);
|
|
} else {
|
|
/*
|
|
* simple_transaction_get() returns null-terminated data
|
|
*/
|
|
res = smk_parse_long_rule(data, &rule, 0, 3);
|
|
}
|
|
|
|
if (res >= 0)
|
|
res = smk_access(rule.smk_subject, rule.smk_object,
|
|
rule.smk_access1, NULL);
|
|
else if (res != -ENOENT)
|
|
return res;
|
|
|
|
/*
|
|
* smk_access() can return a value > 0 in the "bringup" case.
|
|
*/
|
|
data[0] = res >= 0 ? '1' : '0';
|
|
data[1] = '\0';
|
|
|
|
simple_transaction_set(file, 2);
|
|
|
|
if (format == SMK_FIXED24_FMT)
|
|
return SMK_LOADLEN;
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_access_ops = {
|
|
.write = smk_write_access,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/load2
|
|
*/
|
|
|
|
static int load2_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_rule *srp;
|
|
struct smack_known *skp =
|
|
list_entry_rcu(list, struct smack_known, list);
|
|
|
|
list_for_each_entry_rcu(srp, &skp->smk_rules, list)
|
|
smk_rule_show(s, srp, SMK_LONGLABEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations load2_seq_ops = {
|
|
.start = load2_seq_start,
|
|
.next = load2_seq_next,
|
|
.show = load2_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_load2 - open() for /smack/load2
|
|
* @inode: inode structure representing file
|
|
* @file: "load2" file pointer
|
|
*
|
|
* For reading, use load2_seq_* seq_file reading operations.
|
|
*/
|
|
static int smk_open_load2(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &load2_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_load2 - write() for /smack/load2
|
|
* @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_load2(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
/*
|
|
* Must have privilege.
|
|
*/
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
|
|
SMK_LONG_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_load2_ops = {
|
|
.open = smk_open_load2,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_load2,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/load-self2
|
|
*/
|
|
|
|
static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = smack_cred(current_cred());
|
|
|
|
return smk_seq_start(s, pos, &tsp->smk_rules);
|
|
}
|
|
|
|
static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = smack_cred(current_cred());
|
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_rules);
|
|
}
|
|
|
|
static int load_self2_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_rule *srp =
|
|
list_entry_rcu(list, struct smack_rule, list);
|
|
|
|
smk_rule_show(s, srp, SMK_LONGLABEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations load_self2_seq_ops = {
|
|
.start = load_self2_seq_start,
|
|
.next = load_self2_seq_next,
|
|
.show = load_self2_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_load_self2 - open() for /smack/load-self2
|
|
* @inode: inode structure representing file
|
|
* @file: "load" file pointer
|
|
*
|
|
* For reading, use load_seq_* seq_file reading operations.
|
|
*/
|
|
static int smk_open_load_self2(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &load_self2_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_load_self2 - write() for /smack/load-self2
|
|
* @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_self2(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_smack *tsp = smack_cred(current_cred());
|
|
|
|
return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
|
|
&tsp->smk_rules_lock, SMK_LONG_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_load_self2_ops = {
|
|
.open = smk_open_load_self2,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_load_self2,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_write_access2 - 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_access2(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_access2_ops = {
|
|
.write = smk_write_access2,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_write_revoke_subj - write() for /smack/revoke-subject
|
|
* @file: file pointer
|
|
* @buf: data from user space
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*/
|
|
static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *data;
|
|
const char *cp;
|
|
struct smack_known *skp;
|
|
struct smack_rule *sp;
|
|
struct list_head *rule_list;
|
|
struct mutex *rule_lock;
|
|
int rc = count;
|
|
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count == 0 || count > SMK_LONGLABEL)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
cp = smk_parse_smack(data, count);
|
|
if (IS_ERR(cp)) {
|
|
rc = PTR_ERR(cp);
|
|
goto out_data;
|
|
}
|
|
|
|
skp = smk_find_entry(cp);
|
|
if (skp == NULL)
|
|
goto out_cp;
|
|
|
|
rule_list = &skp->smk_rules;
|
|
rule_lock = &skp->smk_rules_lock;
|
|
|
|
mutex_lock(rule_lock);
|
|
|
|
list_for_each_entry_rcu(sp, rule_list, list)
|
|
sp->smk_access = 0;
|
|
|
|
mutex_unlock(rule_lock);
|
|
|
|
out_cp:
|
|
kfree(cp);
|
|
out_data:
|
|
kfree(data);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_revoke_subj_ops = {
|
|
.write = smk_write_revoke_subj,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_init_sysfs - initialize /sys/fs/smackfs
|
|
*
|
|
*/
|
|
static int smk_init_sysfs(void)
|
|
{
|
|
return sysfs_create_mount_point(fs_kobj, "smackfs");
|
|
}
|
|
|
|
/**
|
|
* smk_write_change_rule - write() for /smack/change-rule
|
|
* @file: file pointer
|
|
* @buf: data from user space
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*/
|
|
static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
/*
|
|
* Must have privilege.
|
|
*/
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
|
|
SMK_CHANGE_FMT);
|
|
}
|
|
|
|
static const struct file_operations smk_change_rule_ops = {
|
|
.write = smk_write_change_rule,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_read_syslog - read() for smackfs/syslog
|
|
* @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_syslog(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
struct smack_known *skp;
|
|
ssize_t rc = -EINVAL;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
if (smack_syslog_label == NULL)
|
|
skp = &smack_known_star;
|
|
else
|
|
skp = smack_syslog_label;
|
|
|
|
asize = strlen(skp->smk_known) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
|
|
asize);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_syslog - write() for smackfs/syslog
|
|
* @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_syslog(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *data;
|
|
struct smack_known *skp;
|
|
int rc = count;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Enough data must be present */
|
|
if (count == 0 || count > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
skp = smk_import_entry(data, count);
|
|
if (IS_ERR(skp))
|
|
rc = PTR_ERR(skp);
|
|
else
|
|
smack_syslog_label = skp;
|
|
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_syslog_ops = {
|
|
.read = smk_read_syslog,
|
|
.write = smk_write_syslog,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/*
|
|
* Seq_file read operations for /smack/relabel-self
|
|
*/
|
|
|
|
static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = smack_cred(current_cred());
|
|
|
|
return smk_seq_start(s, pos, &tsp->smk_relabel);
|
|
}
|
|
|
|
static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct task_smack *tsp = smack_cred(current_cred());
|
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_relabel);
|
|
}
|
|
|
|
static int relabel_self_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
struct list_head *list = v;
|
|
struct smack_known_list_elem *sklep =
|
|
list_entry(list, struct smack_known_list_elem, list);
|
|
|
|
seq_puts(s, sklep->smk_label->smk_known);
|
|
seq_putc(s, ' ');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations relabel_self_seq_ops = {
|
|
.start = relabel_self_seq_start,
|
|
.next = relabel_self_seq_next,
|
|
.show = relabel_self_seq_show,
|
|
.stop = smk_seq_stop,
|
|
};
|
|
|
|
/**
|
|
* smk_open_relabel_self - open() for /smack/relabel-self
|
|
* @inode: inode structure representing file
|
|
* @file: "relabel-self" file pointer
|
|
*
|
|
* Connect our relabel_self_seq_* operations with /smack/relabel-self
|
|
* file_operations
|
|
*/
|
|
static int smk_open_relabel_self(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &relabel_self_seq_ops);
|
|
}
|
|
|
|
/**
|
|
* smk_write_relabel_self - write() for /smack/relabel-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_relabel_self(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *data;
|
|
int rc;
|
|
LIST_HEAD(list_tmp);
|
|
|
|
/*
|
|
* Must have privilege.
|
|
*/
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* No partial write.
|
|
* Enough data must be present.
|
|
*/
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
data = memdup_user_nul(buf, count);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
rc = smk_parse_label_list(data, &list_tmp);
|
|
kfree(data);
|
|
|
|
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
|
|
struct cred *new;
|
|
struct task_smack *tsp;
|
|
|
|
new = prepare_creds();
|
|
if (!new) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
tsp = smack_cred(new);
|
|
smk_destroy_label_list(&tsp->smk_relabel);
|
|
list_splice(&list_tmp, &tsp->smk_relabel);
|
|
commit_creds(new);
|
|
return count;
|
|
}
|
|
out:
|
|
smk_destroy_label_list(&list_tmp);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_relabel_self_ops = {
|
|
.open = smk_open_relabel_self,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_relabel_self,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* smk_read_ptrace - read() for /smack/ptrace
|
|
* @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_ptrace(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", smack_ptrace_rule);
|
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_ptrace - write() for /smack/ptrace
|
|
* @file: file pointer
|
|
* @buf: data from user space
|
|
* @count: bytes sent
|
|
* @ppos: where to start - must be 0
|
|
*/
|
|
static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[32];
|
|
int i;
|
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (*ppos != 0 || 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 < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
|
|
return -EINVAL;
|
|
smack_ptrace_rule = i;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_ptrace_ops = {
|
|
.write = smk_write_ptrace,
|
|
.read = smk_read_ptrace,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/**
|
|
* smk_fill_super - fill the smackfs superblock
|
|
* @sb: the empty superblock
|
|
* @fc: unused
|
|
*
|
|
* Fill in the well known entries for the smack filesystem
|
|
*
|
|
* Returns 0 on success, an error code on failure
|
|
*/
|
|
static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
int rc;
|
|
|
|
static const 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_NET4ADDR] = {
|
|
"netlabel", &smk_net4addr_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},
|
|
[SMK_MAPPED] = {
|
|
"mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_LOAD2] = {
|
|
"load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_LOAD_SELF2] = {
|
|
"load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
|
|
[SMK_ACCESS2] = {
|
|
"access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
|
|
[SMK_CIPSO2] = {
|
|
"cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_REVOKE_SUBJ] = {
|
|
"revoke-subject", &smk_revoke_subj_ops,
|
|
S_IRUGO|S_IWUSR},
|
|
[SMK_CHANGE_RULE] = {
|
|
"change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_SYSLOG] = {
|
|
"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_PTRACE] = {
|
|
"ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
|
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
|
|
[SMK_UNCONFINED] = {
|
|
"unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
[SMK_NET6ADDR] = {
|
|
"ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
|
|
#endif /* CONFIG_IPV6 */
|
|
[SMK_RELABEL_SELF] = {
|
|
"relabel-self", &smk_relabel_self_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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* smk_get_tree - get the smackfs superblock
|
|
* @fc: The mount context, including any options
|
|
*
|
|
* Just passes everything along.
|
|
*
|
|
* Returns what the lower level code does.
|
|
*/
|
|
static int smk_get_tree(struct fs_context *fc)
|
|
{
|
|
return get_tree_single(fc, smk_fill_super);
|
|
}
|
|
|
|
static const struct fs_context_operations smk_context_ops = {
|
|
.get_tree = smk_get_tree,
|
|
};
|
|
|
|
/**
|
|
* smk_init_fs_context - Initialise a filesystem context for smackfs
|
|
* @fc: The blank mount context
|
|
*/
|
|
static int smk_init_fs_context(struct fs_context *fc)
|
|
{
|
|
fc->ops = &smk_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
static struct file_system_type smk_fs_type = {
|
|
.name = "smackfs",
|
|
.init_fs_context = smk_init_fs_context,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static struct vfsmount *smackfs_mount;
|
|
|
|
/**
|
|
* init_smk_fs - get the smackfs superblock
|
|
*
|
|
* register the smackfs
|
|
*
|
|
* Do not register smackfs if Smack wasn't enabled
|
|
* on boot. We can not put this method normally under the
|
|
* smack_init() code path since the security subsystem get
|
|
* initialized before the vfs caches.
|
|
*
|
|
* Returns true if we were not chosen on boot or if
|
|
* we were chosen and filesystem registration succeeded.
|
|
*/
|
|
static int __init init_smk_fs(void)
|
|
{
|
|
int err;
|
|
int rc;
|
|
|
|
if (smack_enabled == 0)
|
|
return 0;
|
|
|
|
err = smk_init_sysfs();
|
|
if (err)
|
|
printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
|
|
|
|
err = register_filesystem(&smk_fs_type);
|
|
if (!err) {
|
|
smackfs_mount = kern_mount(&smk_fs_type);
|
|
if (IS_ERR(smackfs_mount)) {
|
|
printk(KERN_ERR "smackfs: could not mount!\n");
|
|
err = PTR_ERR(smackfs_mount);
|
|
smackfs_mount = NULL;
|
|
}
|
|
}
|
|
|
|
smk_cipso_doi();
|
|
smk_unlbl_ambient(NULL);
|
|
|
|
rc = smack_populate_secattr(&smack_known_floor);
|
|
if (err == 0 && rc < 0)
|
|
err = rc;
|
|
rc = smack_populate_secattr(&smack_known_hat);
|
|
if (err == 0 && rc < 0)
|
|
err = rc;
|
|
rc = smack_populate_secattr(&smack_known_huh);
|
|
if (err == 0 && rc < 0)
|
|
err = rc;
|
|
rc = smack_populate_secattr(&smack_known_star);
|
|
if (err == 0 && rc < 0)
|
|
err = rc;
|
|
rc = smack_populate_secattr(&smack_known_web);
|
|
if (err == 0 && rc < 0)
|
|
err = rc;
|
|
|
|
return err;
|
|
}
|
|
|
|
__initcall(init_smk_fs);
|