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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 02/14] security: Add hooks to rule on setting a watch [ver #2] From: David Howells To: torvalds@linux-foundation.org Cc: dhowells@redhat.com, Greg Kroah-Hartman , Casey Schaufler , Stephen Smalley , nicolas.dichtel@6wind.com, raven@themaw.net, Christian Brauner , dhowells@redhat.com, keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-block@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 07 Nov 2019 13:35:38 +0000 Message-ID: <157313373855.29677.3888607349866181437.stgit@warthog.procyon.org.uk> In-Reply-To: <157313371694.29677.15388731274912671071.stgit@warthog.procyon.org.uk> References: <157313371694.29677.15388731274912671071.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: xsJGfgOsOrqquyb3cy4x5g-1 X-Mimecast-Spam-Score: 0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Add security hooks that will allow an LSM to rule on whether or not a watch may be set. More than one hook is required as the watches watch different types of object. Signed-off-by: David Howells cc: Casey Schaufler cc: Stephen Smalley cc: linux-security-module@vger.kernel.org --- include/linux/lsm_hooks.h | 24 ++++++++++++++++++++++++ include/linux/security.h | 17 +++++++++++++++++ security/security.c | 14 ++++++++++++++ 3 files changed, 55 insertions(+) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index a3763247547c..d62e92b768c4 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1416,6 +1416,18 @@ * @ctx is a pointer in which to place the allocated security context. * @ctxlen points to the place to put the length of @ctx. * + * Security hooks for the general notification queue: + * + * @watch_key: + * Check to see if a process is allowed to watch for event notifications + * from a key or keyring. + * @key: The key to watch. + * + * @watch_devices: + * Check to see if a process is allowed to watch for event notifications + * from devices (as a global set). + * + * * Security hooks for using the eBPF maps and programs functionalities through * eBPF syscalls. * @@ -1698,6 +1710,12 @@ union security_list_options { int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen); int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen); int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen); +#ifdef CONFIG_KEY_NOTIFICATIONS + int (*watch_key)(struct key *key); +#endif +#ifdef CONFIG_DEVICE_NOTIFICATIONS + int (*watch_devices)(void); +#endif #ifdef CONFIG_SECURITY_NETWORK int (*unix_stream_connect)(struct sock *sock, struct sock *other, @@ -1977,6 +1995,12 @@ struct security_hook_heads { struct hlist_head inode_notifysecctx; struct hlist_head inode_setsecctx; struct hlist_head inode_getsecctx; +#ifdef CONFIG_KEY_NOTIFICATIONS + struct hlist_head watch_key; +#endif +#ifdef CONFIG_DEVICE_NOTIFICATIONS + struct hlist_head watch_devices; +#endif #ifdef CONFIG_SECURITY_NETWORK struct hlist_head unix_stream_connect; struct hlist_head unix_may_send; diff --git a/include/linux/security.h b/include/linux/security.h index a8d59d612d27..5d1867772022 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1271,6 +1271,23 @@ static inline int security_locked_down(enum lockdown_reason what) } #endif /* CONFIG_SECURITY */ +#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS) +int security_watch_key(struct key *key); +#else +static inline int security_watch_key(struct key *key) +{ + return 0; +} +#endif +#if defined(CONFIG_SECURITY) && defined(CONFIG_DEVICE_NOTIFICATIONS) +int security_watch_devices(void); +#else +static inline int security_watch_devices(void) +{ + return 0; +} +#endif + #ifdef CONFIG_SECURITY_NETWORK int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk); diff --git a/security/security.c b/security/security.c index 1bc000f834e2..4f970716fa6c 100644 --- a/security/security.c +++ b/security/security.c @@ -1956,6 +1956,20 @@ int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) } EXPORT_SYMBOL(security_inode_getsecctx); +#ifdef CONFIG_KEY_NOTIFICATIONS +int security_watch_key(struct key *key) +{ + return call_int_hook(watch_key, 0, key); +} +#endif + +#ifdef CONFIG_DEVICE_NOTIFICATIONS +int security_watch_devices(void) +{ + return call_int_hook(watch_devices, 0); +} +#endif + #ifdef CONFIG_SECURITY_NETWORK int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)