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Andrew Morgan wrote:
> Andrew Morgan wrote:
>> Serge E. Hallyn wrote:
>>> (Sorry, I should have ran shorter tests to get these results a little
>>> quicker...)
>>> Unfortunately these can't be moved here. If you have
>>> SECURITY=y
>>> SECURITY_CAPABILITIES=n
>>> then commoncap is not compiled, and
>>> security/dummy.c wants securebits
OK. I believe this (finally) does it. :-)
Cheers
Andrew
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>From d1904e8f5f28e00957cae25255b1690be8413c77 Mon Sep 17 00:00:00 2001
From: Andrew Morgan <[EMAIL PROTECTED]>
Date: Wed, 15 Aug 2007 07:27:29 -0700
Subject: [PATCH] File capabilities implementation of CAP_SETPCAP
The non-filesystem capability meaning of CAP_SETPCAP is that a
process, p1, can change the capabilities of another process, p2. This
is not the meaning that was intended for this capability at all, and
this implementation came about purely because, without filesystem
capabilities, there was no way to use capabilities without one process
bestowing them on another.
Since we now have a filesystem support for capabilities we can fix the
implementation of CAP_SETPCAP.
The most significant thing about this change is that, with it in
effect, no process can set the capabilities of another process.
The capabilities of a program are set via the capability convolution
rules:
pI(post-exec) = pI(pre-exec)
pP(post-exec) = (X(aka cap_bset) & fP) | (pI(post-exec) & fI)
pE(post-exec) = fE ? pP(post-exec) : 0
at exec() time. As such, the only influence the pre-exec() program can
have on the post-exec() program's capabilities are through the pI
capability set.
The correct implementation for CAP_SETPCAP (and that enabled by this
patch) is that it can be used to add extra pI capabilities to the
current process - to be picked up by subsequent exec()s when the above
convolution rules are applied.
Here is how it works:
Let's say we have a process, p. It has capability sets, pE, pP and pI.
Generally, p, can change the value of its own pI to pI' where
(pI' & ~pI) & ~pP = 0.
That is, the only new things in pI' that were not present in pI need to
be present in pP.
The role of CAP_SETPCAP is basically to permit changes to pI beyond
the above:
if (pE & CAP_SETPCAP) {
pI' = anything; /* ie., even (pI' & ~pI) & ~pP != 0 */
}
This capability is useful for things like login, which (say, via
pam_cap) might want to raise certain inheritable capabilities for use
by the children of the logged-in user's shell, but those capabilities
are not useful to or needed by the login program itself.
One such use might be to limit who can run ping. You set the
capabilities of the 'ping' program to be "= cap_net_raw+i", and then
only shells that have (pI & CAP_NET_RAW) will be able to run
it. Without CAP_SETPCAP implemented as described above, login(pam_cap)
would have to also have (pP & CAP_NET_RAW) in order to raise this
capability and pass it on through the inheritable set.
Signed-off-by: Andrew Morgan <[EMAIL PROTECTED]>
---
include/linux/capability.h | 4 ---
include/linux/security.h | 7 +++++
kernel/capability.c | 8 +-----
kernel/sysctl.c | 8 ++++-
kernel/sysctl_check.c | 5 +++
security/commoncap.c | 59 ++++++++++++++++++++++++++++++++++++++++---
security/dummy.c | 16 +++++------
7 files changed, 80 insertions(+), 27 deletions(-)
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 8961e7f..7a8d7ad 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -310,10 +310,6 @@ typedef __u32 kernel_cap_t;
#define CAP_SETFCAP 31
#ifdef __KERNEL__
-/*
- * Bounding set
- */
-extern kernel_cap_t cap_bset;
/*
* Internal kernel functions only
diff --git a/include/linux/security.h b/include/linux/security.h
index e38230f..b673fd2 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -34,6 +34,13 @@
#include <linux/xfrm.h>
#include <net/flow.h>
+/*
+ * Bounding set
+ */
+extern kernel_cap_t cap_bset;
+
+extern unsigned securebits;
+
struct ctl_table;
/*
diff --git a/kernel/capability.c b/kernel/capability.c
index 8c4773c..55aa5f0 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 1997 Andrew Main <[EMAIL PROTECTED]>
*
- * Integrated into 2.1.97+, Andrew G. Morgan <[EMAIL PROTECTED]>
+ * Integrated into 2.1.97+, Andrew G. Morgan <[EMAIL PROTECTED]>
* 30 May 2002: Cleanup, Robert M. Love <[EMAIL PROTECTED]>
*/
@@ -15,12 +15,6 @@
#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
-unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
-kernel_cap_t cap_bset = CAP_INIT_EFF_SET;
-
-EXPORT_SYMBOL(securebits);
-EXPORT_SYMBOL(cap_bset);
-
/*
* This lock protects task->cap_* for all tasks including current.
* Locking rule: acquire this prior to tasklist_lock.
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8ced8cc..cf0b136 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -25,7 +25,7 @@
#include <linux/swap-prefetch.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
-#include <linux/capability.h>
+#include <linux/security.h>
#include <linux/ctype.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
@@ -370,6 +370,7 @@ static struct ctl_table kern_table[] = {
.proc_handler = &proc_dointvec_taint,
},
#endif
+#ifdef CONFIG_SECURITY_CAPABILITIES
{
.procname = "cap-bound",
.data = &cap_bset,
@@ -377,6 +378,7 @@ static struct ctl_table kern_table[] = {
.mode = 0600,
.proc_handler = &proc_dointvec_bset,
},
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
#ifdef CONFIG_BLK_DEV_INITRD
{
.ctl_name = KERN_REALROOTDEV,
@@ -1899,10 +1901,11 @@ static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
return 0;
}
+#ifdef CONFIG_SECURITY_CAPABILITIES
/*
* init may raise the set.
*/
-
+
int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -1916,6 +1919,7 @@ int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
do_proc_dointvec_bset_conv,&op);
}
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
/*
* Taint values can only be increased
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index 930a514..7aa581b 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -37,7 +37,10 @@ static struct trans_ctl_table trans_kern_table[] = {
{ KERN_NODENAME, "hostname" },
{ KERN_DOMAINNAME, "domainname" },
+#ifdef CONFIG_SECURITY_CAPABILITIES
{ KERN_CAP_BSET, "cap-bound" },
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
+
{ KERN_PANIC, "panic" },
{ KERN_REALROOTDEV, "real-root-dev" },
@@ -1510,7 +1513,9 @@ int sysctl_check_table(struct ctl_table *table)
(table->strategy == sysctl_ms_jiffies) ||
(table->proc_handler == proc_dostring) ||
(table->proc_handler == proc_dointvec) ||
+#ifdef CONFIG_SECURITY_CAPABILITIES
(table->proc_handler == proc_dointvec_bset) ||
+#endif /* def CONFIG_SECURITY_CAPABILITIES */
(table->proc_handler == proc_dointvec_minmax) ||
(table->proc_handler == proc_dointvec_jiffies) ||
(table->proc_handler == proc_dointvec_userhz_jiffies) ||
diff --git a/security/commoncap.c b/security/commoncap.c
index 7816cdc..ef4beaa 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -25,6 +25,25 @@
#include <linux/mount.h>
#include <linux/sched.h>
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+/*
+ * Because of the reduced scope of CAP_SETPCAP when filesystem
+ * capabilities are in effect, it is safe to allow this capability to
+ * be available in the default configuration.
+ */
+# define CAP_INIT_BSET CAP_FULL_SET
+#else /* ie. ndef CONFIG_SECURITY_FILE_CAPABILITIES */
+# define CAP_INIT_BSET CAP_INIT_EFF_SET
+#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
+
+kernel_cap_t cap_bset = CAP_INIT_BSET; /* systemwide capability bound */
+EXPORT_SYMBOL(cap_bset);
+
+/* Global security state */
+
+unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
+EXPORT_SYMBOL(securebits);
+
int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
{
NETLINK_CB(skb).eff_cap = current->cap_effective;
@@ -76,14 +95,44 @@ int cap_capget (struct task_struct *target, kernel_cap_t *effective,
return 0;
}
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+
+static inline int cap_block_setpcap(struct task_struct *target)
+{
+ /*
+ * No support for remote process capability manipulation with
+ * filesystem capability support.
+ */
+ return (target != current);
+}
+
+static inline int cap_inh_is_capped(void)
+{
+ /*
+ * return 1 if changes to the inheritable set are limited
+ * to the old permitted set.
+ */
+ return !cap_capable(current, CAP_SETPCAP);
+}
+
+#else /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
+
+static inline int cap_block_setpcap(struct task_struct *t) { return 0; }
+static inline int cap_inh_is_capped(void) { return 1; }
+
+#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
+
int cap_capset_check (struct task_struct *target, kernel_cap_t *effective,
kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
- /* Derived from kernel/capability.c:sys_capset. */
- /* verify restrictions on target's new Inheritable set */
- if (!cap_issubset (*inheritable,
- cap_combine (target->cap_inheritable,
- current->cap_permitted))) {
+ if (cap_block_setpcap(target)) {
+ return -EPERM;
+ }
+ if (cap_inh_is_capped()
+ && !cap_issubset(*inheritable,
+ cap_combine(target->cap_inheritable,
+ current->cap_permitted))) {
+ /* incapable of using this inheritable set */
return -EPERM;
}
diff --git a/security/dummy.c b/security/dummy.c
index 5839faa..80142a9 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -37,15 +37,13 @@ static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
kernel_cap_t * inheritable, kernel_cap_t * permitted)
{
*effective = *inheritable = *permitted = 0;
- if (!issecure(SECURE_NOROOT)) {
- if (target->euid == 0) {
- *permitted |= (~0 & ~CAP_FS_MASK);
- *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
- }
- if (target->fsuid == 0) {
- *permitted |= CAP_FS_MASK;
- *effective |= CAP_FS_MASK;
- }
+ if (target->euid == 0) {
+ *permitted |= (~0 & ~CAP_FS_MASK);
+ *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
+ }
+ if (target->fsuid == 0) {
+ *permitted |= CAP_FS_MASK;
+ *effective |= CAP_FS_MASK;
}
return 0;
}
--
1.5.1.3
