aboutsummaryrefslogtreecommitdiff
path: root/security
diff options
context:
space:
mode:
authorEric Paris <eparis@redhat.com>2006-06-26 00:26:03 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:26 -0700
commit42c3e03ef6b298813557cdb997bd6db619cd65a2 (patch)
treec2fba776ccf7015d45651ff7d2aee89f06da6f42 /security
parentc1df7fb88a011b39ea722ac00975c5b8a803261b (diff)
downloadlinux-2.6.34-ux500-42c3e03ef6b298813557cdb997bd6db619cd65a2.tar.gz
[PATCH] SELinux: Add sockcreate node to procattr API
Below is a patch to add a new /proc/self/attr/sockcreate A process may write a context into this interface and all subsequent sockets created will be labeled with that context. This is the same idea as the fscreate interface where a process can specify the label of a file about to be created. At this time one envisioned user of this will be xinetd. It will be able to better label sockets for the actual services. At this time all sockets take the label of the creating process, so all xinitd sockets would just be labeled the same. I tested this by creating a tcp sender and listener. The sender was able to write to this new proc file and then create sockets with the specified label. I am able to be sure the new label was used since the avc denial messages kicked out by the kernel included both the new security permission setsockcreate and all the socket denials were for the new label, not the label of the running process. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c22
-rw-r--r--security/selinux/include/av_perm_to_string.h1
-rw-r--r--security/selinux/include/av_permissions.h1
-rw-r--r--security/selinux/include/objsec.h1
4 files changed, 20 insertions, 5 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0d8b27513bd..ac7f2b2e392 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1532,8 +1532,9 @@ static int selinux_bprm_set_security(struct linux_binprm *bprm)
/* Default to the current task SID. */
bsec->sid = tsec->sid;
- /* Reset create SID on execve. */
+ /* Reset create and sockcreate SID on execve. */
tsec->create_sid = 0;
+ tsec->sockcreate_sid = 0;
if (tsec->exec_sid) {
newsid = tsec->exec_sid;
@@ -2585,9 +2586,10 @@ static int selinux_task_alloc_security(struct task_struct *tsk)
tsec2->osid = tsec1->osid;
tsec2->sid = tsec1->sid;
- /* Retain the exec and create SIDs across fork */
+ /* Retain the exec, create, and sock SIDs across fork */
tsec2->exec_sid = tsec1->exec_sid;
tsec2->create_sid = tsec1->create_sid;
+ tsec2->sockcreate_sid = tsec1->sockcreate_sid;
/* Retain ptracer SID across fork, if any.
This will be reset by the ptrace hook upon any
@@ -2937,12 +2939,14 @@ static int selinux_socket_create(int family, int type,
{
int err = 0;
struct task_security_struct *tsec;
+ u32 newsid;
if (kern)
goto out;
tsec = current->security;
- err = avc_has_perm(tsec->sid, tsec->sid,
+ newsid = tsec->sockcreate_sid ? : tsec->sid;
+ err = avc_has_perm(tsec->sid, newsid,
socket_type_to_security_class(family, type,
protocol), SOCKET__CREATE, NULL);
@@ -2955,12 +2959,14 @@ static void selinux_socket_post_create(struct socket *sock, int family,
{
struct inode_security_struct *isec;
struct task_security_struct *tsec;
+ u32 newsid;
isec = SOCK_INODE(sock)->i_security;
tsec = current->security;
+ newsid = tsec->sockcreate_sid ? : tsec->sid;
isec->sclass = socket_type_to_security_class(family, type, protocol);
- isec->sid = kern ? SECINITSID_KERNEL : tsec->sid;
+ isec->sid = kern ? SECINITSID_KERNEL : newsid;
isec->initialized = 1;
return;
@@ -4163,6 +4169,8 @@ static int selinux_getprocattr(struct task_struct *p,
sid = tsec->create_sid;
else if (!strcmp(name, "keycreate"))
sid = tsec->keycreate_sid;
+ else if (!strcmp(name, "sockcreate"))
+ sid = tsec->sockcreate_sid;
else
return -EINVAL;
@@ -4197,6 +4205,8 @@ static int selinux_setprocattr(struct task_struct *p,
error = task_has_perm(current, p, PROCESS__SETFSCREATE);
else if (!strcmp(name, "keycreate"))
error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
+ else if (!strcmp(name, "sockcreate"))
+ error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
else if (!strcmp(name, "current"))
error = task_has_perm(current, p, PROCESS__SETCURRENT);
else
@@ -4231,7 +4241,9 @@ static int selinux_setprocattr(struct task_struct *p,
if (error)
return error;
tsec->keycreate_sid = sid;
- } else if (!strcmp(name, "current")) {
+ } else if (!strcmp(name, "sockcreate"))
+ tsec->sockcreate_sid = sid;
+ else if (!strcmp(name, "current")) {
struct av_decision avd;
if (sid == 0)
diff --git a/security/selinux/include/av_perm_to_string.h b/security/selinux/include/av_perm_to_string.h
index e777578ccd9..7c9b5838083 100644
--- a/security/selinux/include/av_perm_to_string.h
+++ b/security/selinux/include/av_perm_to_string.h
@@ -73,6 +73,7 @@
S_(SECCLASS_PROCESS, PROCESS__EXECSTACK, "execstack")
S_(SECCLASS_PROCESS, PROCESS__EXECHEAP, "execheap")
S_(SECCLASS_PROCESS, PROCESS__SETKEYCREATE, "setkeycreate")
+ S_(SECCLASS_PROCESS, PROCESS__SETSOCKCREATE, "setsockcreate")
S_(SECCLASS_MSGQ, MSGQ__ENQUEUE, "enqueue")
S_(SECCLASS_MSG, MSG__SEND, "send")
S_(SECCLASS_MSG, MSG__RECEIVE, "receive")
diff --git a/security/selinux/include/av_permissions.h b/security/selinux/include/av_permissions.h
index 1e1678023b6..69fd4b48202 100644
--- a/security/selinux/include/av_permissions.h
+++ b/security/selinux/include/av_permissions.h
@@ -468,6 +468,7 @@
#define PROCESS__EXECSTACK 0x04000000UL
#define PROCESS__EXECHEAP 0x08000000UL
#define PROCESS__SETKEYCREATE 0x10000000UL
+#define PROCESS__SETSOCKCREATE 0x20000000UL
#define IPC__CREATE 0x00000001UL
#define IPC__DESTROY 0x00000002UL
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 191b3e4484c..cf54a304169 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -33,6 +33,7 @@ struct task_security_struct {
u32 exec_sid; /* exec SID */
u32 create_sid; /* fscreate SID */
u32 keycreate_sid; /* keycreate SID */
+ u32 sockcreate_sid; /* fscreate SID */
u32 ptrace_sid; /* SID of ptrace parent */
};