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authorDavid Howells <dhowells@redhat.com>2014-07-22 21:54:43 +0100
committerDavid Howells <dhowells@redhat.com>2014-07-22 21:54:43 +0100
commit64724cfc6eea920dbaada14f0fb978b1dd31192d (patch)
treed2f491be07a05e2d96b5c8b8e5a0a878f285eb22 /security
parent6204e0025566ad3992ce649d4f44b7e8cdde2293 (diff)
parent7d2ce2320e8efdc4a6dcbae7b329ed3f0d1cd778 (diff)
downloadlinux-stericsson-64724cfc6eea920dbaada14f0fb978b1dd31192d.tar.gz
Merge remote-tracking branch 'integrity/next-with-keys' into keys-next
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/digsig.c28
-rw-r--r--security/integrity/ima/Kconfig10
-rw-r--r--security/integrity/ima/ima.h12
-rw-r--r--security/integrity/ima/ima_main.c10
-rw-r--r--security/integrity/integrity.h5
-rw-r--r--security/keys/keyctl.c6
6 files changed, 67 insertions, 4 deletions
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index b4af4ebc5be2..8d4fbff8b87c 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -13,7 +13,9 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
+#include <linux/sched.h>
#include <linux/rbtree.h>
+#include <linux/cred.h>
#include <linux/key-type.h>
#include <linux/digsig.h>
@@ -24,7 +26,11 @@ static struct key *keyring[INTEGRITY_KEYRING_MAX];
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
"_evm",
"_module",
+#ifndef CONFIG_IMA_TRUSTED_KEYRING
"_ima",
+#else
+ ".ima",
+#endif
};
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
@@ -56,3 +62,25 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
return -EOPNOTSUPP;
}
+
+int integrity_init_keyring(const unsigned int id)
+{
+ const struct cred *cred = current_cred();
+ int err = 0;
+
+ keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
+ KGIDT_INIT(0), cred,
+ ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ |
+ KEY_USR_WRITE | KEY_USR_SEARCH),
+ KEY_ALLOC_NOT_IN_QUOTA, NULL);
+ if (!IS_ERR(keyring[id]))
+ set_bit(KEY_FLAG_TRUSTED_ONLY, &keyring[id]->flags);
+ else {
+ err = PTR_ERR(keyring[id]);
+ pr_info("Can't allocate %s keyring (%d)\n",
+ keyring_name[id], err);
+ keyring[id] = NULL;
+ }
+ return err;
+}
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index 81a27971d884..08758fbd496f 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -123,3 +123,13 @@ config IMA_APPRAISE
For more information on integrity appraisal refer to:
<http://linux-ima.sourceforge.net>
If unsure, say N.
+
+config IMA_TRUSTED_KEYRING
+ bool "Require all keys on the .ima keyring be signed"
+ depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
+ depends on INTEGRITY_ASYMMETRIC_KEYS
+ select KEYS_DEBUG_PROC_KEYS
+ default y
+ help
+ This option requires that all keys added to the .ima
+ keyring be signed by a key on the system trusted keyring.
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index f79fa8be203c..c42056edfc97 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -249,4 +249,16 @@ static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
return -EINVAL;
}
#endif /* CONFIG_IMA_LSM_RULES */
+
+#ifdef CONFIG_IMA_TRUSTED_KEYRING
+static inline int ima_init_keyring(const unsigned int id)
+{
+ return integrity_init_keyring(id);
+}
+#else
+static inline int ima_init_keyring(const unsigned int id)
+{
+ return 0;
+}
+#endif /* CONFIG_IMA_TRUSTED_KEYRING */
#endif
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index f474c608fa11..0d696431209c 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -325,8 +325,14 @@ static int __init init_ima(void)
hash_setup(CONFIG_IMA_DEFAULT_HASH);
error = ima_init();
- if (!error)
- ima_initialized = 1;
+ if (error)
+ goto out;
+
+ error = ima_init_keyring(INTEGRITY_KEYRING_IMA);
+ if (error)
+ goto out;
+ ima_initialized = 1;
+out:
return error;
}
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 33c0a70f6b15..09c440d9aaee 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -124,6 +124,7 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
const char *digest, int digestlen);
+int integrity_init_keyring(const unsigned int id);
#else
static inline int integrity_digsig_verify(const unsigned int id,
@@ -133,6 +134,10 @@ static inline int integrity_digsig_verify(const unsigned int id,
return -EOPNOTSUPP;
}
+static inline int integrity_init_keyring(const unsigned int id)
+{
+ return 0;
+}
#endif /* CONFIG_INTEGRITY_SIGNATURE */
#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index cd5bd0cef25d..8a8c23357291 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -37,8 +37,6 @@ static int key_get_type_from_user(char *type,
return ret;
if (ret == 0 || ret >= len)
return -EINVAL;
- if (type[0] == '.')
- return -EPERM;
type[len - 1] = '\0';
return 0;
}
@@ -86,6 +84,10 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
if (!*description) {
kfree(description);
description = NULL;
+ } else if ((description[0] == '.') &&
+ (strncmp(type, "keyring", 7) == 0)) {
+ ret = -EPERM;
+ goto error2;
}
}