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Date: Sun, 23 Oct 2011 07:24:47 +1100 (EST)
From: James Morris <jmorris@...ei.org>
To: Casey Schaufler <casey@...aufler-ca.com>
cc: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>,
linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Smack: allow to access /smack/access as normal user
On Fri, 21 Oct 2011, Casey Schaufler wrote:
> On 10/18/2011 11:21 AM, Jarkko Sakkinen wrote:
> > Allow query access as a normal user removing the need
> > for CAP_MAC_ADMIN. Give RW access to /smack/access
> > for UGO. Do not import smack labels in access check.
> >
> > Signed-off-by: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>
>
> Applied to git://gitorious.org/smack-next/kernel.git#master
>
> James, will you please pull:
Pulled, but please use git-request-pull for these requests.
>
> commit 0e94ae17c857b3835a2b8ea46ce44b5da4e2cc5d
> Author: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>
> Date: Tue Oct 18 21:21:36 2011 +0300
>
> Smack: allow to access /smack/access as normal user
>
> Allow query access as a normal user removing the need
> for CAP_MAC_ADMIN. Give RW access to /smack/access
> for UGO. Do not import smack labels in access check.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>
> Signed-off-by: Casey Schaufler <cschaufler@...haufler-intel.(none)>
>
> commit d86b2b61d4dea614d6f319772a90a8f98b55ed67
> Author: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>
> Date: Tue Oct 18 14:34:28 2011 +0300
>
> Smack: fix: invalid length set for the result of /smack/access
>
> Forgot to update simple_transaction_set() to take terminator
> character into account.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>
> Signed-off-by: Casey Schaufler <cschaufler@...haufler-intel.(none)>
>
>
>
> > ---
> > security/smack/smack.h | 1 +
> > security/smack/smack_access.c | 27 +++++++++++++++++-------
> > security/smack/smackfs.c | 45 +++++++++++++++++++++++++++-------------
> > 3 files changed, 50 insertions(+), 23 deletions(-)
> >
> > diff --git a/security/smack/smack.h b/security/smack/smack.h
> > index 9da2b2d..2ad0065 100644
> > --- a/security/smack/smack.h
> > +++ b/security/smack/smack.h
> > @@ -208,6 +208,7 @@ int smk_curacc(char *, u32, struct smk_audit_info *);
> > int smack_to_cipso(const char *, struct smack_cipso *);
> > char *smack_from_cipso(u32, char *);
> > char *smack_from_secid(const u32);
> > +void smk_parse_smack(const char *string, int len, char *smack);
> > char *smk_import(const char *, int);
> > struct smack_known *smk_import_entry(const char *, int);
> > struct smack_known *smk_find_entry(const char *);
> > diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
> > index a885f62..cc7cb6e 100644
> > --- a/security/smack/smack_access.c
> > +++ b/security/smack/smack_access.c
> > @@ -353,17 +353,13 @@ struct smack_known *smk_find_entry(const char *string)
> > }
> >
> > /**
> > - * smk_import_entry - import a label, return the list entry
> > - * @string: a text string that might be a Smack label
> > + * smk_parse_smack - parse smack label from a text string
> > + * @string: a text string that might contain a Smack label
> > * @len: the maximum size, or zero if it is NULL terminated.
> > - *
> > - * Returns a pointer to the entry in the label list that
> > - * matches the passed string, adding it if necessary.
> > + * @smack: parsed smack label, or NULL if parse error
> > */
> > -struct smack_known *smk_import_entry(const char *string, int len)
> > +void smk_parse_smack(const char *string, int len, char *smack)
> > {
> > - struct smack_known *skp;
> > - char smack[SMK_LABELLEN];
> > int found;
> > int i;
> >
> > @@ -381,7 +377,22 @@ struct smack_known *smk_import_entry(const char *string, int len)
> > } else
> > smack[i] = string[i];
> > }
> > +}
> > +
> > +/**
> > + * smk_import_entry - import a label, return the list entry
> > + * @string: a text string that might be a Smack label
> > + * @len: the maximum size, or zero if it is NULL terminated.
> > + *
> > + * Returns a pointer to the entry in the label list that
> > + * matches the passed string, adding it if necessary.
> > + */
> > +struct smack_known *smk_import_entry(const char *string, int len)
> > +{
> > + struct smack_known *skp;
> > + char smack[SMK_LABELLEN];
> >
> > + smk_parse_smack(string, len, smack);
> > if (smack[0] == '\0')
> > return NULL;
> >
> > diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
> > index 381eecf..6aceef5 100644
> > --- a/security/smack/smackfs.c
> > +++ b/security/smack/smackfs.c
> > @@ -191,19 +191,37 @@ static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
> > }
> >
> > /**
> > - * smk_parse_rule - parse subject, object and access type
> > + * smk_parse_rule - parse Smack rule from load string
> > * @data: string to be parsed whose size is SMK_LOADLEN
> > - * @rule: parsed entities are stored in here
> > + * @rule: Smack rule
> > + * @import: if non-zero, import labels
> > */
> > -static int smk_parse_rule(const char *data, struct smack_rule *rule)
> > +static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
> > {
> > - rule->smk_subject = smk_import(data, 0);
> > - if (rule->smk_subject == NULL)
> > - return -1;
> > + char smack[SMK_LABELLEN];
> > + struct smack_known *skp;
> >
> > - rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
> > - if (rule->smk_object == NULL)
> > - return -1;
> > + if (import) {
> > + rule->smk_subject = smk_import(data, 0);
> > + if (rule->smk_subject == NULL)
> > + return -1;
> > +
> > + rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
> > + if (rule->smk_object == NULL)
> > + return -1;
> > + } else {
> > + smk_parse_smack(data, 0, smack);
> > + skp = smk_find_entry(smack);
> > + if (skp == NULL)
> > + return -1;
> > + rule->smk_subject = skp->smk_known;
> > +
> > + smk_parse_smack(data + SMK_LABELLEN, 0, smack);
> > + skp = smk_find_entry(smack);
> > + if (skp == NULL)
> > + return -1;
> > + rule->smk_object = skp->smk_known;
> > + }
> >
> > rule->smk_access = 0;
> >
> > @@ -327,7 +345,7 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
> > goto out;
> > }
> >
> > - if (smk_parse_rule(data, rule))
> > + if (smk_parse_rule(data, rule, 1))
> > goto out_free_rule;
> >
> > if (rule_list == NULL) {
> > @@ -1499,14 +1517,11 @@ static ssize_t smk_write_access(struct file *file, const char __user *buf,
> > char *data;
> > int res;
> >
> > - if (!capable(CAP_MAC_ADMIN))
> > - return -EPERM;
> > -
> > data = simple_transaction_get(file, buf, count);
> > if (IS_ERR(data))
> > return PTR_ERR(data);
> >
> > - if (count < SMK_LOADLEN || smk_parse_rule(data, &rule))
> > + if (count < SMK_LOADLEN || smk_parse_rule(data, &rule, 0))
> > return -EINVAL;
> >
> > res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
> > @@ -1560,7 +1575,7 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
> > [SMK_LOAD_SELF] = {
> > "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
> > [SMK_ACCESSES] = {
> > - "access", &smk_access_ops, S_IRUGO|S_IWUSR},
> > + "access", &smk_access_ops, S_IRUGO|S_IWUGO},
> > /* last one */
> > {""}
> > };
>
--
James Morris
<jmorris@...ei.org>
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