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Date: Fri, 21 Oct 2011 11:47:12 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: Jarkko Sakkinen <jarkko.j.sakkinen@...il.com>,
James Morris <jmorris@...ei.org>
CC: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Smack: allow to access /smack/access as normal user
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:
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 */
> {""}
> };
--
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