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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 02/11] security: Add hooks to rule on setting a watch [ver #6] From: David Howells To: viro@zeniv.linux.org.uk Cc: dhowells@redhat.com, Casey Schaufler , Stephen Smalley , Greg Kroah-Hartman , nicolas.dichtel@6wind.com, raven@themaw.net, Christian Brauner , dhowells@redhat.com, keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-block@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 29 Aug 2019 19:30:07 +0100 Message-ID: <156710340735.10009.5077888091140004991.stgit@warthog.procyon.org.uk> In-Reply-To: <156710338860.10009.12524626894838499011.stgit@warthog.procyon.org.uk> References: <156710338860.10009.12524626894838499011.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Thu, 29 Aug 2019 18:30:11 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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 | 22 ++++++++++++++++++++++ include/linux/security.h | 15 +++++++++++++++ security/security.c | 13 +++++++++++++ 3 files changed, 50 insertions(+) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index df1318d85f7d..19108185b254 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1413,6 +1413,20 @@ * @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. + * @watch: The watch object + * @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). + * @watch: The watch object + * + * * Security hooks for using the eBPF maps and programs functionalities through * eBPF syscalls. * @@ -1688,6 +1702,10 @@ 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_WATCH_QUEUE + int (*watch_key)(struct watch *watch, struct key *key); + int (*watch_devices)(struct watch *watch); +#endif /* CONFIG_WATCH_QUEUE */ #ifdef CONFIG_SECURITY_NETWORK int (*unix_stream_connect)(struct sock *sock, struct sock *other, @@ -1964,6 +1982,10 @@ struct security_hook_heads { struct hlist_head inode_notifysecctx; struct hlist_head inode_setsecctx; struct hlist_head inode_getsecctx; +#ifdef CONFIG_WATCH_QUEUE + struct hlist_head watch_key; + struct hlist_head watch_devices; +#endif /* CONFIG_WATCH_QUEUE */ #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 5f7441abbf42..feeade454308 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -57,6 +57,7 @@ struct mm_struct; struct fs_context; struct fs_parameter; enum fs_value_type; +struct watch; /* Default (no) options for the capable function */ #define CAP_OPT_NONE 0x0 @@ -392,6 +393,10 @@ void security_inode_invalidate_secctx(struct inode *inode); int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen); int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen); int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen); +#ifdef CONFIG_WATCH_QUEUE +int security_watch_key(struct watch *watch, struct key *key); +int security_watch_devices(struct watch *watch); +#endif /* CONFIG_WATCH_QUEUE */ #else /* CONFIG_SECURITY */ static inline int call_blocking_lsm_notifier(enum lsm_event event, void *data) @@ -1204,6 +1209,16 @@ static inline int security_inode_getsecctx(struct inode *inode, void **ctx, u32 { return -EOPNOTSUPP; } +#ifdef CONFIG_WATCH_QUEUE +static inline int security_watch_key(struct watch *watch, struct key *key) +{ + return 0; +} +static inline int security_watch_devices(struct watch *watch) +{ + return 0; +} +#endif /* CONFIG_WATCH_QUEUE */ #endif /* CONFIG_SECURITY */ #ifdef CONFIG_SECURITY_NETWORK diff --git a/security/security.c b/security/security.c index 250ee2d76406..1ebd2c936a57 100644 --- a/security/security.c +++ b/security/security.c @@ -1916,6 +1916,19 @@ int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) } EXPORT_SYMBOL(security_inode_getsecctx); +#ifdef CONFIG_WATCH_QUEUE +int security_watch_key(struct watch *watch, struct key *key) +{ + return call_int_hook(watch_key, 0, watch, key); +} + +int security_watch_devices(struct watch *watch) +{ + return call_int_hook(watch_devices, 0, watch); +} + +#endif /* CONFIG_WATCH_QUEUE */ + #ifdef CONFIG_SECURITY_NETWORK int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)