[14/27] LSM: Specify which LSM to display
diff mbox series

Message ID 20190726233923.2570-15-casey@schaufler-ca.com
State New
Headers show
Series
  • LSM: Module stacking for AppArmor
Related show

Commit Message

Casey Schaufler July 26, 2019, 11:39 p.m. UTC
Create a new entry "display" in /proc/.../attr for controlling
which LSM security information is displayed for a process.
The name of an active LSM that supplies hooks for human readable
data may be written to "display" to set the value. The name of
the LSM currently in use can be read from "display".
At this point there can only be one LSM capable of display
active. A helper function lsm_task_display() to get the display
slot for a task_struct.

When a program is executed in a way that changes its privilege
the display is reset to the initial state to prevent unprivileged
programs from tricking it into setting an unexpected display.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 fs/proc/base.c            |   1 +
 include/linux/lsm_hooks.h |  15 ++++
 security/security.c       | 150 +++++++++++++++++++++++++++++++++-----
 3 files changed, 148 insertions(+), 18 deletions(-)

Comments

Kees Cook July 29, 2019, 5:05 p.m. UTC | #1
On Fri, Jul 26, 2019 at 04:39:10PM -0700, Casey Schaufler wrote:
> When a program is executed in a way that changes its privilege
> the display is reset to the initial state to prevent unprivileged
> programs from tricking it into setting an unexpected display.
> [...]
> diff --git a/security/security.c b/security/security.c
> index 8927508b2142..4dd4ebeda18d 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -835,7 +857,18 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
>  
>  int security_bprm_set_creds(struct linux_binprm *bprm)
>  {
> -	return call_int_hook(bprm_set_creds, 0, bprm);
> +	int *disp = current->security;
> +	int rc;
> +
> +	rc = call_int_hook(bprm_set_creds, 0, bprm);
> +
> +	/*
> +	 * Reset the "display" LSM if privilege has been elevated.
> +	 */
> +	if (bprm->cap_elevated && disp)
> +		*disp = LSMBLOB_INVALID;
> +
> +	return rc;
>  }

I think this is the wrong place to check this. This is called in
prepare_binprm(), which is very early in the execve() process. By my
reading this will change the forked process's display first before the
exec happens (which may potentially fail) -- this needs to be changing
the final state once exec is under way (past the "point of no return" in
flush_old_exec()).

Also, the consolidation of privilege information happens into
bprm->secureexec in setup_new_exec(), so I think you want to test
secureexec not just cap_elevated.

So the test/clear should likely happen in finalize_exec() since it's a
runtime state, not a memory layout-changing state (which would need to
happen earlier).

Patch
diff mbox series

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ddef482f1334..7bf70e041315 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2618,6 +2618,7 @@  static const struct pid_entry attr_dir_stuff[] = {
 	ATTR(NULL, "fscreate",		0666),
 	ATTR(NULL, "keycreate",		0666),
 	ATTR(NULL, "sockcreate",	0666),
+	ATTR(NULL, "display",		0666),
 #ifdef CONFIG_SECURITY_SMACK
 	DIR("smack",			0555,
 	    proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index fe1fb7a69ee5..33e5ab4af9f8 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -2134,4 +2134,19 @@  static inline void security_delete_hooks(struct security_hook_list *hooks,
 
 extern int lsm_inode_alloc(struct inode *inode);
 
+/**
+ * lsm_task_display - the "display LSM for this task
+ * @task: The task to report on
+ *
+ * Returns the task's display LSM slot.
+ */
+static inline int lsm_task_display(struct task_struct *task)
+{
+	int *display = task->security;
+
+	if (display)
+		return *display;
+	return LSMBLOB_INVALID;
+}
+
 #endif /* ! __LINUX_LSM_HOOKS_H */
diff --git a/security/security.c b/security/security.c
index 8927508b2142..4dd4ebeda18d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -31,6 +31,7 @@ 
 #include <linux/backing-dev.h>
 #include <linux/string.h>
 #include <linux/msg.h>
+#include <linux/binfmts.h>
 #include <net/flow.h>
 #include <net/sock.h>
 
@@ -46,7 +47,14 @@  static struct kmem_cache *lsm_file_cache;
 static struct kmem_cache *lsm_inode_cache;
 
 char *lsm_names;
-static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init;
+
+/*
+ * The task blob includes the "display" slot used for
+ * chosing which module presents contexts.
+ */
+static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init = {
+	.lbs_task = sizeof(int),
+};
 
 /* Boot-time LSM user choice */
 static __initdata const char *chosen_lsm_order;
@@ -423,8 +431,10 @@  static int lsm_append(const char *new, char **result)
 
 /*
  * Current index to use while initializing the lsmblob secid list.
+ * Pointers to the LSM id structures for local use.
  */
 static int lsm_slot __lsm_ro_after_init;
+static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES];
 
 /**
  * security_add_hooks - Add a modules hooks to the hook lists.
@@ -444,6 +454,7 @@  void __init security_add_hooks(struct security_hook_list *hooks, int count,
 	if (lsmid->slot == LSMBLOB_NEEDED) {
 		if (lsm_slot >= LSMBLOB_ENTRIES)
 			panic("%s Too many LSMs registered.\n", __func__);
+		lsm_slotlist[lsm_slot] = lsmid;
 		lsmid->slot = lsm_slot++;
 		init_debug("%s assigned lsmblob slot %d\n", lsmid->lsm,
 			   lsmid->slot);
@@ -564,6 +575,8 @@  int lsm_inode_alloc(struct inode *inode)
  */
 static int lsm_task_alloc(struct task_struct *task)
 {
+	int *display;
+
 	if (blob_sizes.lbs_task == 0) {
 		task->security = NULL;
 		return 0;
@@ -572,6 +585,15 @@  static int lsm_task_alloc(struct task_struct *task)
 	task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
 	if (task->security == NULL)
 		return -ENOMEM;
+
+	/*
+	 * The start of the task blob contains the "display" LSM slot number.
+	 * Start with it set to the invalid slot number, indicating that the
+	 * default first registered LSM be displayed.
+	 */
+	display = task->security;
+	*display = LSMBLOB_INVALID;
+
 	return 0;
 }
 
@@ -835,7 +857,18 @@  int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
 
 int security_bprm_set_creds(struct linux_binprm *bprm)
 {
-	return call_int_hook(bprm_set_creds, 0, bprm);
+	int *disp = current->security;
+	int rc;
+
+	rc = call_int_hook(bprm_set_creds, 0, bprm);
+
+	/*
+	 * Reset the "display" LSM if privilege has been elevated.
+	 */
+	if (bprm->cap_elevated && disp)
+		*disp = LSMBLOB_INVALID;
+
+	return rc;
 }
 
 int security_bprm_check(struct linux_binprm *bprm)
@@ -1563,14 +1596,26 @@  int security_file_open(struct file *file)
 
 int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
 {
+	int *odisplay = current->security;
+	int *ndisplay;
 	int rc = lsm_task_alloc(task);
 
-	if (rc)
+	if (unlikely(rc))
 		return rc;
+
 	rc = call_int_hook(task_alloc, 0, task, clone_flags);
-	if (unlikely(rc))
+	if (unlikely(rc)) {
 		security_task_free(task);
-	return rc;
+		return rc;
+	}
+
+	if (odisplay) {
+		ndisplay = task->security;
+		if (ndisplay)
+			*ndisplay = *odisplay;
+	}
+
+	return 0;
 }
 
 void security_task_free(struct task_struct *task)
@@ -1967,10 +2012,29 @@  int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
 				char **value)
 {
 	struct security_hook_list *hp;
+	int display = lsm_task_display(current);
+	int slot = 0;
+
+	if (!strcmp(name, "display")) {
+		/*
+		 * lsm_slot will be 0 if there are no displaying modules.
+		 */
+		if (lsm_slot == 0)
+			return -EINVAL;
+		if (display != LSMBLOB_INVALID)
+			slot = display;
+		*value = kstrdup(lsm_slotlist[slot]->lsm, GFP_KERNEL);
+		if (*value)
+			return strlen(*value);
+		return -ENOMEM;
+	}
 
 	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
 		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
 			continue;
+		if (lsm == NULL && display != LSMBLOB_INVALID &&
+		    display != hp->lsmid->slot)
+			continue;
 		return hp->hook.getprocattr(p, name, value);
 	}
 	return -EINVAL;
@@ -1980,10 +2044,46 @@  int security_setprocattr(const char *lsm, const char *name, void *value,
 			 size_t size)
 {
 	struct security_hook_list *hp;
+	char *term;
+	char *cp;
+	int *display = current->security;
+	int rc = -EINVAL;
+	int slot = 0;
+
+	if (!strcmp(name, "display")) {
+		/*
+		 * lsm_slot will be 0 if there are no displaying modules.
+		 */
+		if (lsm_slot == 0 || size == 0)
+			return -EINVAL;
+		cp = kzalloc(size + 1, GFP_KERNEL);
+		if (cp == NULL)
+			return -ENOMEM;
+		memcpy(cp, value, size);
+
+		term = strchr(cp, ' ');
+		if (term == NULL)
+			term = strchr(cp, '\n');
+		if (term != NULL)
+			*term = '\0';
+
+		for (slot = 0; slot < lsm_slot; slot++)
+			if (!strcmp(cp, lsm_slotlist[slot]->lsm)) {
+				*display = lsm_slotlist[slot]->slot;
+				rc = size;
+				break;
+			}
+
+		kfree(cp);
+		return rc;
+	}
 
 	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
 		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
 			continue;
+		if (lsm == NULL && *display != LSMBLOB_INVALID &&
+		    *display != hp->lsmid->slot)
+			continue;
 		return hp->hook.setprocattr(name, value, size);
 	}
 	return -EINVAL;
@@ -2003,15 +2103,15 @@  EXPORT_SYMBOL(security_ismaclabel);
 int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
 {
 	struct security_hook_list *hp;
-	int rc;
+	int display = lsm_task_display(current);
 
 	hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
 		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
 			continue;
-		rc = hp->hook.secid_to_secctx(blob->secid[hp->lsmid->slot],
-					      secdata, seclen);
-		if (rc != 0)
-			return rc;
+		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+			return hp->hook.secid_to_secctx(
+					blob->secid[hp->lsmid->slot],
+					secdata, seclen);
 	}
 	return 0;
 }
@@ -2021,16 +2121,15 @@  int security_secctx_to_secid(const char *secdata, u32 seclen,
 			     struct lsmblob *blob)
 {
 	struct security_hook_list *hp;
-	int rc;
+	int display = lsm_task_display(current);
 
 	lsmblob_init(blob, 0);
 	hlist_for_each_entry(hp, &security_hook_heads.secctx_to_secid, list) {
 		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
 			continue;
-		rc = hp->hook.secctx_to_secid(secdata, seclen,
-					      &blob->secid[hp->lsmid->slot]);
-		if (rc != 0)
-			return rc;
+		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+			return hp->hook.secctx_to_secid(secdata, seclen,
+						&blob->secid[hp->lsmid->slot]);
 	}
 	return 0;
 }
@@ -2038,7 +2137,15 @@  EXPORT_SYMBOL(security_secctx_to_secid);
 
 void security_release_secctx(char *secdata, u32 seclen)
 {
-	call_void_hook(release_secctx, secdata, seclen);
+	struct security_hook_list *hp;
+	int *display = current->security;
+
+	hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list)
+		if (display == NULL || *display == LSMBLOB_INVALID ||
+		    *display == hp->lsmid->slot) {
+			hp->hook.release_secctx(secdata, seclen);
+			return;
+		}
 }
 EXPORT_SYMBOL(security_release_secctx);
 
@@ -2163,8 +2270,15 @@  EXPORT_SYMBOL(security_sock_rcv_skb);
 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 				      int __user *optlen, unsigned len)
 {
-	return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
-				optval, optlen, len);
+	int display = lsm_task_display(current);
+	struct security_hook_list *hp;
+
+	hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
+			     list)
+		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
+			return hp->hook.socket_getpeersec_stream(sock, optval,
+								 optlen, len);
+	return -ENOPROTOOPT;
 }
 
 int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,