From: Petko Manolov <petkan@mip-labs.com>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: linux-security-module@vger.kernel.org,
"Luis R. Rodriguez" <mcgrof@suse.com>,
kexec@lists.infradead.org, linux-modules@vger.kernel.org,
fsdevel@vger.kernel.org, David Howells <dhowells@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Kees Cook <keescook@chromium.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
Eric Biederman <ebiederm@xmission.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Dmitry Kasatkin <d.kasatkin@samsung.com>,
Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
Subject: Re: [PATCH v3 20/22] ima: load policy using path
Date: Sun, 7 Feb 2016 21:59:45 +0200 [thread overview]
Message-ID: <20160207195945.GG17321@localhost> (raw)
In-Reply-To: <1454526390-19792-21-git-send-email-zohar@linux.vnet.ibm.com>
On 16-02-03 14:06:28, Mimi Zohar wrote:
> From: Dmitry Kasatkin <d.kasatkin@samsung.com>
>
> We currently cannot do appraisal or signature vetting of IMA policies
> since we currently can only load IMA policies by writing the contents
> of the policy directly in, as follows:
>
> cat policy-file > <securityfs>/ima/policy
>
> If we provide the kernel the path to the IMA policy so it can load
> the policy itself it'd be able to later appraise or vet the file
> signature if it has one. This patch adds support to load the IMA
> policy with a given path as follows:
>
> echo /etc/ima/ima_policy > /sys/kernel/security/ima/policy
>
> Changelog v3:
> - moved kernel_read_file_from_path() to a separate patch
> v2:
> - after re-ordering the patches, replace calling integrity_kernel_read()
> to read the file with kernel_read_file_from_path() (Mimi)
> - Patch description re-written by Luis R. Rodriguez
>
> Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
> ---
> include/linux/fs.h | 1 +
> security/integrity/ima/ima_fs.c | 43 +++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index d4d556e..b648e6d 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2531,6 +2531,7 @@ enum kernel_read_file_id {
> READING_MODULE,
> READING_KEXEC_IMAGE,
> READING_KEXEC_INITRAMFS,
> + READING_POLICY,
> READING_MAX_ID
> };
>
> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
> index f355231..00ccd67 100644
> --- a/security/integrity/ima/ima_fs.c
> +++ b/security/integrity/ima/ima_fs.c
> @@ -22,6 +22,7 @@
> #include <linux/rculist.h>
> #include <linux/rcupdate.h>
> #include <linux/parser.h>
> +#include <linux/vmalloc.h>
>
> #include "ima.h"
>
> @@ -258,6 +259,41 @@ static const struct file_operations ima_ascii_measurements_ops = {
> .release = seq_release,
> };
>
> +static ssize_t ima_read_policy(char *path)
> +{
> + void *data;
> + char *datap;
> + loff_t size;
> + int rc, pathlen = strlen(path);
> +
> + char *p;
> +
> + /* remove \n */
> + datap = path;
> + strsep(&datap, "\n");
> +
> + rc = kernel_read_file_from_path(path, &data, &size, 0, READING_POLICY);
> + if (rc < 0)
> + return rc;
> +
> + datap = data;
> + while (size > 0 && (p = strsep(&datap, "\n"))) {
> + pr_debug("rule: %s\n", p);
> + rc = ima_parse_add_rule(p);
> + if (rc < 0)
> + break;
> + size -= rc;
> + }
> +
> + vfree(data);
> + if (rc < 0)
> + return rc;
> + else if (size)
> + return -EINVAL;
> + else
> + return pathlen;
> +}
> +
> static ssize_t ima_write_policy(struct file *file, const char __user *buf,
> size_t datalen, loff_t *ppos)
> {
> @@ -286,9 +322,12 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
> result = mutex_lock_interruptible(&ima_write_mutex);
> if (result < 0)
> goto out_free;
> - result = ima_parse_add_rule(data);
> - mutex_unlock(&ima_write_mutex);
>
> + if (data[0] == '/')
It seems that if we feed relative path to ima_policy the update will fail...
> + result = ima_read_policy(data);
> + else
> + result = ima_parse_add_rule(data);
> + mutex_unlock(&ima_write_mutex);
> out_free:
> kfree(data);
> out:
> --
> 2.1.0
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2016-02-07 19:59 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 19:06 [PATCH v3 00/22] vfs: support for a common kernel file loader Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 01/22] ima: separate 'security.ima' reading functionality from collect Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 02/22] ima: refactor ima_policy_show() to display "ima_hooks" rules Mimi Zohar
2016-02-07 19:45 ` Petko Manolov
2016-02-10 19:33 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 03/22] ima: use "ima_hooks" enum as function argument Mimi Zohar
2016-02-07 19:46 ` Petko Manolov
2016-02-10 19:35 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 04/22] firmware: simplify dev_*() print messages for generic helpers Mimi Zohar
2016-02-04 17:26 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 05/22] firmware: move completing fw into a helper Mimi Zohar
2016-02-04 17:27 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 06/22] firmware: fold successful fw read early Mimi Zohar
2016-02-04 17:36 ` Kees Cook
2016-02-04 20:26 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 07/22] vfs: define a generic function to read a file from the kernel Mimi Zohar
2016-02-04 17:41 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 08/22] vfs: define kernel_read_file_id enumeration Mimi Zohar
2016-02-04 17:41 ` Kees Cook
2016-02-04 19:45 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 09/22] ima: provide buffer hash calculation function Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 10/22] ima: calculate the hash of a buffer using aynchronous hash(ahash) Mimi Zohar
2016-02-10 19:58 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 11/22] ima: define a new hook to measure and appraise a file already in memory Mimi Zohar
2016-02-10 20:27 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 12/22] vfs: define kernel_read_file_from_path Mimi Zohar
2016-02-04 17:46 ` Kees Cook
2016-02-04 19:47 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 13/22] firmware: replace call to fw_read_file_contents() with kernel version Mimi Zohar
2016-02-04 17:56 ` Kees Cook
2016-02-04 19:51 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 14/22] security: define kernel_read_file hook Mimi Zohar
2016-02-04 17:57 ` Kees Cook
2016-02-04 19:54 ` Luis R. Rodriguez
2016-02-11 16:54 ` Casey Schaufler
2016-02-11 19:35 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 15/22] vfs: define kernel_copy_file_from_fd() Mimi Zohar
2016-02-04 17:58 ` Kees Cook
2016-02-04 19:55 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 16/22] module: replace copy_module_from_fd with kernel version Mimi Zohar
2016-02-04 18:04 ` Kees Cook
2016-02-04 19:56 ` Luis R. Rodriguez
2016-02-05 0:19 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 17/22] ima: remove firmware and module specific cached status info Mimi Zohar
2016-02-07 19:56 ` Petko Manolov
2016-02-10 20:18 ` Dmitry Kasatkin
2016-02-10 23:14 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 18/22] kexec: replace call to copy_file_from_fd() with kernel version Mimi Zohar
2016-02-04 18:05 ` Kees Cook
2016-02-04 19:57 ` Luis R. Rodriguez
2016-02-12 12:50 ` Dave Young
2016-02-03 19:06 ` [PATCH v3 19/22] ima: support for kexec image and initramfs Mimi Zohar
2016-02-07 20:10 ` Petko Manolov
2016-02-08 23:34 ` Mimi Zohar
2016-02-10 21:09 ` Dmitry Kasatkin
2016-02-10 23:21 ` Mimi Zohar
[not found] ` <CACE9dm8OJ1cgbKszUG-pCiEMVarUFLLWi_jewVV-JEMGAJsA-g@mail.gmail.com>
2016-02-11 2:08 ` Mimi Zohar
2016-02-11 8:47 ` Dmitry Kasatkin
2016-02-11 12:16 ` Mimi Zohar
2016-02-12 12:53 ` Dave Young
2016-02-12 13:09 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 20/22] ima: load policy using path Mimi Zohar
2016-02-07 19:59 ` Petko Manolov [this message]
2016-02-08 9:58 ` Dmitry Kasatkin
2016-02-08 10:35 ` Petko Manolov
2016-02-08 10:45 ` Dmitry Kasatkin
2016-02-08 21:12 ` Mimi Zohar
2016-02-09 7:47 ` Petko Manolov
2016-02-03 19:06 ` [PATCH v3 21/22] ima: measure and appraise the IMA policy itself Mimi Zohar
2016-02-07 20:01 ` Petko Manolov
2016-02-10 20:22 ` Dmitry Kasatkin
2016-02-10 23:15 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 22/22] ima: require signed IMA policy Mimi Zohar
2016-02-07 20:02 ` Petko Manolov
2016-02-10 20:24 ` Dmitry Kasatkin
2016-02-04 18:15 ` [PATCH v3 00/22] vfs: support for a common kernel file loader Kees Cook
2016-02-04 23:54 ` Mimi Zohar
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