![Sergio Luis](/assets/img/avatar_default.png)
smackfs: check for allocation failures in smk_set_access() While adding a new subject/object pair to smack_list, smk_set_access() didn't check the return of kzalloc(). This patch changes smk_set_access() to return 0 or -ENOMEM, based on kzalloc()'s return. It also updates its caller, smk_write_load(), to check for smk_set_access()'s return, given it is no longer a void return function. Signed-off-by: Sergio Luis <sergio@larces.uece.br> To: Casey Schaufler <casey@schaufler-ca.com> Cc: Ahmed S. Darwish <darwish.07@gmail.com> Cc: LSM <linux-security-module@vger.kernel.org> Cc: LKLM <linux-kernel@vger.kernel.org> Acked-by: Casey Schaufler <casey@schaufler-ca.com>
1108 lines
24 KiB
C
1108 lines
24 KiB
C
/*
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* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* Authors:
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* Casey Schaufler <casey@schaufler-ca.com>
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* Ahmed S. Darwish <darwish.07@gmail.com>
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*
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* Special thanks to the authors of selinuxfs.
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*
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* Karl MacMillan <kmacmillan@tresys.com>
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* James Morris <jmorris@redhat.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/vmalloc.h>
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#include <linux/security.h>
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#include <linux/mutex.h>
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#include <net/netlabel.h>
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#include <net/cipso_ipv4.h>
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#include <linux/seq_file.h>
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#include <linux/ctype.h>
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#include <linux/audit.h>
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#include "smack.h"
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/*
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* smackfs pseudo filesystem.
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*/
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enum smk_inos {
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SMK_ROOT_INO = 2,
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SMK_LOAD = 3, /* load policy */
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SMK_CIPSO = 4, /* load label -> CIPSO mapping */
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SMK_DOI = 5, /* CIPSO DOI */
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SMK_DIRECT = 6, /* CIPSO level indicating direct label */
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SMK_AMBIENT = 7, /* internet ambient label */
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SMK_NLTYPE = 8, /* label scheme to use by default */
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SMK_ONLYCAP = 9, /* the only "capable" label */
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};
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/*
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* List locks
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*/
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static DEFINE_MUTEX(smack_list_lock);
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static DEFINE_MUTEX(smack_cipso_lock);
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static DEFINE_MUTEX(smack_ambient_lock);
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/*
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* This is the "ambient" label for network traffic.
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* If it isn't somehow marked, use this.
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* It can be reset via smackfs/ambient
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*/
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char *smack_net_ambient = smack_known_floor.smk_known;
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/*
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* This is the default packet marking scheme for network traffic.
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* It can be reset via smackfs/nltype
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*/
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int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
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/*
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* This is the level in a CIPSO header that indicates a
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* smack label is contained directly in the category set.
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* It can be reset via smackfs/direct
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*/
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int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
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/*
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* Unless a process is running with this label even
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* having CAP_MAC_OVERRIDE isn't enough to grant
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* privilege to violate MAC policy. If no label is
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* designated (the NULL case) capabilities apply to
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* everyone. It is expected that the hat (^) label
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* will be used if any label is used.
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*/
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char *smack_onlycap;
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static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
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struct smk_list_entry *smack_list;
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#define SEQ_READ_FINISHED 1
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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_ACCESS "rwxa"
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#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
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#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
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/*
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* Seq_file read operations for /smack/load
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*/
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static void *load_seq_start(struct seq_file *s, loff_t *pos)
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{
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if (*pos == SEQ_READ_FINISHED)
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return NULL;
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return smack_list;
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}
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static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
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if (skp == NULL)
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*pos = SEQ_READ_FINISHED;
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return skp;
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}
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static int load_seq_show(struct seq_file *s, void *v)
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{
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struct smk_list_entry *slp = (struct smk_list_entry *) v;
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struct smack_rule *srp = &slp->smk_rule;
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seq_printf(s, "%s %s", (char *)srp->smk_subject,
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(char *)srp->smk_object);
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seq_putc(s, ' ');
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if (srp->smk_access & MAY_READ)
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seq_putc(s, 'r');
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if (srp->smk_access & MAY_WRITE)
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seq_putc(s, 'w');
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if (srp->smk_access & MAY_EXEC)
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seq_putc(s, 'x');
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if (srp->smk_access & MAY_APPEND)
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seq_putc(s, 'a');
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if (srp->smk_access == 0)
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seq_putc(s, '-');
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seq_putc(s, '\n');
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return 0;
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}
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static void load_seq_stop(struct seq_file *s, void *v)
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{
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/* No-op */
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}
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static struct seq_operations load_seq_ops = {
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.start = load_seq_start,
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.next = load_seq_next,
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.show = load_seq_show,
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.stop = load_seq_stop,
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};
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/**
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* smk_open_load - open() for /smack/load
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* @inode: inode structure representing file
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* @file: "load" file pointer
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*
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* For reading, use load_seq_* seq_file reading operations.
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*/
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static int smk_open_load(struct inode *inode, struct file *file)
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{
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return seq_open(file, &load_seq_ops);
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}
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/**
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* smk_set_access - add a rule to the rule list
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* @srp: the new rule to add
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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_rule *srp)
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{
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struct smk_list_entry *sp;
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struct smk_list_entry *newp;
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int ret = 0;
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mutex_lock(&smack_list_lock);
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for (sp = smack_list; sp != NULL; sp = sp->smk_next)
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if (sp->smk_rule.smk_subject == srp->smk_subject &&
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sp->smk_rule.smk_object == srp->smk_object) {
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sp->smk_rule.smk_access = srp->smk_access;
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break;
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}
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if (sp == NULL) {
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newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
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if (newp == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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newp->smk_rule = *srp;
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newp->smk_next = smack_list;
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smack_list = newp;
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}
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out:
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mutex_unlock(&smack_list_lock);
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return ret;
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}
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/**
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* smk_write_load - write() for /smack/load
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* @filp: file pointer, not actually used
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* @buf: where to get the data from
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* @count: bytes sent
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* @ppos: where to start - must be 0
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*
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* Get one smack access rule from above.
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* The format is exactly:
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* char subject[SMK_LABELLEN]
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* char object[SMK_LABELLEN]
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* char access[SMK_ACCESSLEN]
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*
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* writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
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*/
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static ssize_t smk_write_load(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct smack_rule rule;
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char *data;
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int rc = -EINVAL;
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/*
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* Must have privilege.
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* No partial writes.
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* Enough data must be present.
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*/
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if (!capable(CAP_MAC_ADMIN))
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return -EPERM;
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if (*ppos != 0)
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return -EINVAL;
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if (count != SMK_LOADLEN)
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return -EINVAL;
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data = kzalloc(count, GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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if (copy_from_user(data, buf, count) != 0) {
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rc = -EFAULT;
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goto out;
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}
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rule.smk_subject = smk_import(data, 0);
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if (rule.smk_subject == NULL)
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goto out;
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rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
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if (rule.smk_object == NULL)
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goto out;
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rule.smk_access = 0;
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switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
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case '-':
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break;
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case 'r':
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case 'R':
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rule.smk_access |= MAY_READ;
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break;
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default:
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goto out;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
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case '-':
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break;
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case 'w':
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case 'W':
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rule.smk_access |= MAY_WRITE;
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break;
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default:
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goto out;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
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case '-':
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break;
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case 'x':
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case 'X':
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rule.smk_access |= MAY_EXEC;
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break;
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default:
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goto out;
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}
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switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
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case '-':
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break;
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case 'a':
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case 'A':
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rule.smk_access |= MAY_READ;
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break;
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default:
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goto out;
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}
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rc = smk_set_access(&rule);
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if (!rc)
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rc = count;
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out:
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kfree(data);
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return rc;
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}
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static const struct file_operations smk_load_ops = {
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.open = smk_open_load,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = smk_write_load,
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.release = seq_release,
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};
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/**
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* smk_cipso_doi - initialize the CIPSO domain
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*/
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static void smk_cipso_doi(void)
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{
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int rc;
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struct cipso_v4_doi *doip;
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struct netlbl_audit audit_info;
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audit_info.loginuid = audit_get_loginuid(current);
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audit_info.sessionid = audit_get_sessionid(current);
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audit_info.secid = smack_to_secid(current_security());
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rc = netlbl_cfg_map_del(NULL, &audit_info);
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if (rc != 0)
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printk(KERN_WARNING "%s:%d remove rc = %d\n",
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__func__, __LINE__, rc);
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doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
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if (doip == NULL)
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panic("smack: Failed to initialize cipso DOI.\n");
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doip->map.std = NULL;
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doip->doi = smk_cipso_doi_value;
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doip->type = CIPSO_V4_MAP_PASS;
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doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
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for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
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doip->tags[rc] = CIPSO_V4_TAG_INVALID;
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rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
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if (rc != 0) {
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printk(KERN_WARNING "%s:%d add rc = %d\n",
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__func__, __LINE__, rc);
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kfree(doip);
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}
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}
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/**
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* smk_unlbl_ambient - initialize the unlabeled domain
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*/
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static void smk_unlbl_ambient(char *oldambient)
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{
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int rc;
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struct netlbl_audit audit_info;
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audit_info.loginuid = audit_get_loginuid(current);
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audit_info.sessionid = audit_get_sessionid(current);
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audit_info.secid = smack_to_secid(current_security());
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if (oldambient != NULL) {
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rc = netlbl_cfg_map_del(oldambient, &audit_info);
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if (rc != 0)
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printk(KERN_WARNING "%s:%d remove rc = %d\n",
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__func__, __LINE__, rc);
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}
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rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info);
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if (rc != 0)
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printk(KERN_WARNING "%s:%d add rc = %d\n",
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__func__, __LINE__, rc);
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}
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/*
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* Seq_file read operations for /smack/cipso
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*/
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static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
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{
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if (*pos == SEQ_READ_FINISHED)
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return NULL;
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return smack_known;
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}
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static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct smack_known *skp = ((struct smack_known *) v)->smk_next;
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/*
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* Omit labels with no associated cipso value
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*/
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while (skp != NULL && !skp->smk_cipso)
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skp = skp->smk_next;
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if (skp == NULL)
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*pos = SEQ_READ_FINISHED;
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return skp;
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}
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/*
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* Print cipso labels in format:
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* label level[/cat[,cat]]
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*/
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static int cipso_seq_show(struct seq_file *s, void *v)
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{
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struct smack_known *skp = (struct smack_known *) v;
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struct smack_cipso *scp = skp->smk_cipso;
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char *cbp;
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char sep = '/';
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int cat = 1;
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int i;
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unsigned char m;
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if (scp == NULL)
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return 0;
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seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
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cbp = scp->smk_catset;
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for (i = 0; i < SMK_LABELLEN; i++)
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for (m = 0x80; m != 0; m >>= 1) {
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if (m & cbp[i]) {
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seq_printf(s, "%c%d", sep, cat);
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sep = ',';
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}
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cat++;
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}
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seq_putc(s, '\n');
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return 0;
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}
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static void cipso_seq_stop(struct seq_file *s, void *v)
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{
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/* No-op */
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}
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static struct seq_operations cipso_seq_ops = {
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.start = cipso_seq_start,
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.stop = cipso_seq_stop,
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.next = cipso_seq_next,
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.show = cipso_seq_show,
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};
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/**
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* smk_open_cipso - open() for /smack/cipso
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* @inode: inode structure representing file
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* @file: "cipso" file pointer
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*
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* Connect our cipso_seq_* operations with /smack/cipso
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* file_operations
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*/
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static int smk_open_cipso(struct inode *inode, struct file *file)
|
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{
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return seq_open(file, &cipso_seq_ops);
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}
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|
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/**
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* smk_write_cipso - write() for /smack/cipso
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* @filp: 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
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*
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* Accepts only one cipso rule per write call.
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* Returns number of bytes written or error code, as appropriate
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*/
|
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static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
|
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{
|
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struct smack_known *skp;
|
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struct smack_cipso *scp = NULL;
|
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char mapcatset[SMK_LABELLEN];
|
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int maplevel;
|
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int cat;
|
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int catlen;
|
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ssize_t rc = -EINVAL;
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char *data = NULL;
|
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char *rule;
|
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int ret;
|
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int i;
|
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|
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/*
|
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* Must have privilege.
|
|
* No partial writes.
|
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* Enough data must be present.
|
|
*/
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
|
|
return -EINVAL;
|
|
|
|
data = kzalloc(count + 1, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(data, buf, count) != 0) {
|
|
rc = -EFAULT;
|
|
goto unlockedout;
|
|
}
|
|
|
|
data[count] = '\0';
|
|
rule = data;
|
|
/*
|
|
* Only allow one writer at a time. Writes should be
|
|
* quite rare and small in any case.
|
|
*/
|
|
mutex_lock(&smack_cipso_lock);
|
|
|
|
skp = smk_import_entry(rule, 0);
|
|
if (skp == NULL)
|
|
goto out;
|
|
|
|
rule += SMK_LABELLEN;;
|
|
ret = sscanf(rule, "%d", &maplevel);
|
|
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
|
|
goto out;
|
|
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &catlen);
|
|
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
|
|
goto out;
|
|
|
|
if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
|
|
goto out;
|
|
|
|
memset(mapcatset, 0, sizeof(mapcatset));
|
|
|
|
for (i = 0; i < catlen; i++) {
|
|
rule += SMK_DIGITLEN;
|
|
ret = sscanf(rule, "%d", &cat);
|
|
if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
|
|
goto out;
|
|
|
|
smack_catset_bit(cat, mapcatset);
|
|
}
|
|
|
|
if (skp->smk_cipso == NULL) {
|
|
scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
|
|
if (scp == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
spin_lock_bh(&skp->smk_cipsolock);
|
|
|
|
if (scp == NULL)
|
|
scp = skp->smk_cipso;
|
|
else
|
|
skp->smk_cipso = scp;
|
|
|
|
scp->smk_level = maplevel;
|
|
memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
|
|
|
|
spin_unlock_bh(&skp->smk_cipsolock);
|
|
|
|
rc = count;
|
|
out:
|
|
mutex_unlock(&smack_cipso_lock);
|
|
unlockedout:
|
|
kfree(data);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations smk_cipso_ops = {
|
|
.open = smk_open_cipso,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.write = smk_write_cipso,
|
|
.release = seq_release,
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_doi(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smk_cipso_doi_value = i;
|
|
|
|
smk_cipso_doi();
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_doi_ops = {
|
|
.read = smk_read_doi,
|
|
.write = smk_write_doi,
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_direct(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char temp[80];
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= sizeof(temp) || count == 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(temp, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
temp[count] = '\0';
|
|
|
|
if (sscanf(temp, "%d", &i) != 1)
|
|
return -EINVAL;
|
|
|
|
smack_cipso_direct = i;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_direct_ops = {
|
|
.read = smk_read_direct,
|
|
.write = smk_write_direct,
|
|
};
|
|
|
|
/**
|
|
* smk_read_ambient - read() for /smack/ambient
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
ssize_t rc;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
/*
|
|
* Being careful to avoid a problem in the case where
|
|
* smack_net_ambient gets changed in midstream.
|
|
*/
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
asize = strlen(smack_net_ambient) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos,
|
|
smack_net_ambient, asize);
|
|
else
|
|
rc = -EINVAL;
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_ambient - write() for /smack/ambient
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *oldambient;
|
|
char *smack;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
smack = smk_import(in, count);
|
|
if (smack == NULL)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&smack_ambient_lock);
|
|
|
|
oldambient = smack_net_ambient;
|
|
smack_net_ambient = smack;
|
|
smk_unlbl_ambient(oldambient);
|
|
|
|
mutex_unlock(&smack_ambient_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_ambient_ops = {
|
|
.read = smk_read_ambient,
|
|
.write = smk_write_ambient,
|
|
};
|
|
|
|
/**
|
|
* smk_read_onlycap - read() for /smack/onlycap
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to put the result
|
|
* @cn: maximum to send along
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes read or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
|
|
size_t cn, loff_t *ppos)
|
|
{
|
|
char *smack = "";
|
|
ssize_t rc = -EINVAL;
|
|
int asize;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
if (smack_onlycap != NULL)
|
|
smack = smack_onlycap;
|
|
|
|
asize = strlen(smack) + 1;
|
|
|
|
if (cn >= asize)
|
|
rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_onlycap - write() for /smack/onlycap
|
|
* @filp: file pointer, not actually used
|
|
* @buf: where to get the data from
|
|
* @count: bytes sent
|
|
* @ppos: where to start
|
|
*
|
|
* Returns number of bytes written or error code, as appropriate
|
|
*/
|
|
static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char in[SMK_LABELLEN];
|
|
char *sp = current->cred->security;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* This can be done using smk_access() but is done
|
|
* explicitly for clarity. The smk_access() implementation
|
|
* would use smk_access(smack_onlycap, MAY_WRITE)
|
|
*/
|
|
if (smack_onlycap != NULL && smack_onlycap != sp)
|
|
return -EPERM;
|
|
|
|
if (count >= SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(in, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Should the null string be passed in unset the onlycap value.
|
|
* This seems like something to be careful with as usually
|
|
* smk_import only expects to return NULL for errors. It
|
|
* is usually the case that a nullstring or "\n" would be
|
|
* bad to pass to smk_import but in fact this is useful here.
|
|
*/
|
|
smack_onlycap = smk_import(in, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations smk_onlycap_ops = {
|
|
.read = smk_read_onlycap,
|
|
.write = smk_write_onlycap,
|
|
};
|
|
|
|
struct option_names {
|
|
int o_number;
|
|
char *o_name;
|
|
char *o_alias;
|
|
};
|
|
|
|
static struct option_names netlbl_choices[] = {
|
|
{ NETLBL_NLTYPE_RIPSO,
|
|
NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
|
|
{ NETLBL_NLTYPE_CIPSOV4,
|
|
NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
|
|
{ NETLBL_NLTYPE_CIPSOV4,
|
|
NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
|
|
{ NETLBL_NLTYPE_CIPSOV6,
|
|
NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
|
|
{ NETLBL_NLTYPE_UNLABELED,
|
|
NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
|
|
};
|
|
|
|
/**
|
|
* smk_read_nltype - read() for /smack/nltype
|
|
* @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_nltype(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char bound[40];
|
|
ssize_t rc;
|
|
int i;
|
|
|
|
if (count < SMK_LABELLEN)
|
|
return -EINVAL;
|
|
|
|
if (*ppos != 0)
|
|
return 0;
|
|
|
|
sprintf(bound, "unknown");
|
|
|
|
for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
|
|
if (smack_net_nltype == netlbl_choices[i].o_number) {
|
|
sprintf(bound, "%s", netlbl_choices[i].o_name);
|
|
break;
|
|
}
|
|
|
|
rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* smk_write_nltype - write() for /smack/nltype
|
|
* @filp: 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_nltype(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char bound[40];
|
|
char *cp;
|
|
int i;
|
|
|
|
if (!capable(CAP_MAC_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (count >= 40)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(bound, buf, count) != 0)
|
|
return -EFAULT;
|
|
|
|
bound[count] = '\0';
|
|
cp = strchr(bound, ' ');
|
|
if (cp != NULL)
|
|
*cp = '\0';
|
|
cp = strchr(bound, '\n');
|
|
if (cp != NULL)
|
|
*cp = '\0';
|
|
|
|
for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
|
|
if (strcmp(bound, netlbl_choices[i].o_name) == 0 ||
|
|
strcmp(bound, netlbl_choices[i].o_alias) == 0) {
|
|
smack_net_nltype = netlbl_choices[i].o_number;
|
|
return count;
|
|
}
|
|
/*
|
|
* Not a valid choice.
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct file_operations smk_nltype_ops = {
|
|
.read = smk_read_nltype,
|
|
.write = smk_write_nltype,
|
|
};
|
|
|
|
/**
|
|
* smk_fill_super - fill the /smackfs superblock
|
|
* @sb: the empty superblock
|
|
* @data: unused
|
|
* @silent: unused
|
|
*
|
|
* Fill in the well known entries for /smack
|
|
*
|
|
* Returns 0 on success, an error code on failure
|
|
*/
|
|
static int smk_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
int rc;
|
|
struct inode *root_inode;
|
|
|
|
static struct tree_descr smack_files[] = {
|
|
[SMK_LOAD] =
|
|
{"load", &smk_load_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_CIPSO] =
|
|
{"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DOI] =
|
|
{"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_DIRECT] =
|
|
{"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_AMBIENT] =
|
|
{"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_NLTYPE] =
|
|
{"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
|
|
[SMK_ONLYCAP] =
|
|
{"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
|
|
/* last one */ {""}
|
|
};
|
|
|
|
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
|
|
if (rc != 0) {
|
|
printk(KERN_ERR "%s failed %d while creating inodes\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
root_inode = sb->s_root->d_inode;
|
|
root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* smk_get_sb - get the smackfs superblock
|
|
* @fs_type: passed along without comment
|
|
* @flags: passed along without comment
|
|
* @dev_name: passed along without comment
|
|
* @data: passed along without comment
|
|
* @mnt: passed along without comment
|
|
*
|
|
* Just passes everything along.
|
|
*
|
|
* Returns what the lower level code does.
|
|
*/
|
|
static int smk_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
|
|
}
|
|
|
|
static struct file_system_type smk_fs_type = {
|
|
.name = "smackfs",
|
|
.get_sb = smk_get_sb,
|
|
.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;
|
|
|
|
if (!security_module_enable(&smack_ops))
|
|
return 0;
|
|
|
|
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);
|
|
|
|
return err;
|
|
}
|
|
|
|
__initcall(init_smk_fs);
|