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I noticed the security_compute_create_name(3) is not merged yet,
although its corresponding kernel feature got merged.
So, let me remind the patch I sent to the list several months ago.
I'd like to use this interface to implement special case handling
for the default labeling behavior on temporary database objects.
Thanks,
Signed-off-by: KaiGai Kohei <kohei.kaigai@xxxxxxxxxxxx>
---
libselinux/include/selinux/selinux.h | 10 ++
libselinux/man/man3/security_compute_av.3 | 17 ++++-
libselinux/man/man3/security_compute_create_name.3 | 1 +
libselinux/src/compute_create.c | 88 +++++++++++++++++---
libselinux/src/selinux_internal.h | 2 +
5 files changed, 105 insertions(+), 13 deletions(-)
diff --git a/libselinux/include/selinux/selinux.h
b/libselinux/include/selinux/selinux.h
index 0725b57..d0ddb78 100644
--- a/libselinux/include/selinux/selinux.h
+++ b/libselinux/include/selinux/selinux.h
@@ -211,6 +211,16 @@ extern int security_compute_create_raw(const
security_context_t scon,
const security_context_t tcon,
security_class_t tclass,
security_context_t * newcon);
+extern int security_compute_create_name(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ const char *objname,
+ security_context_t * newcon);
+extern int security_compute_create_name_raw(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ const char *objname,
+ security_context_t * newcon);
/* Compute a relabeling decision and set *newcon to refer to it.
Caller must free via freecon. */
diff --git a/libselinux/man/man3/security_compute_av.3
b/libselinux/man/man3/security_compute_av.3
index f2d9f30..8e821cf 100644
--- a/libselinux/man/man3/security_compute_av.3
+++ b/libselinux/man/man3/security_compute_av.3
@@ -1,6 +1,6 @@
.TH "security_compute_av" "3" "1 January 2004" "russell@xxxxxxxxxxxx"
"SELinux API documentation"
.SH "NAME"
-security_compute_av, security_compute_av_flags,
security_compute_create, security_compute_relabel,
+security_compute_av, security_compute_av_flags,
security_compute_create, security_compute_create_name,
security_compute_relabel,
security_compute_member, security_compute_user,
security_get_initial_context \- query
the SELinux policy database in the kernel.
@@ -15,6 +15,8 @@ the SELinux policy database in the kernel.
.sp
.BI "int security_compute_create(security_context_t "scon ",
security_context_t "tcon ", security_class_t "tclass ",
security_context_t *" newcon );
.sp
+.BI "int security_compute_create_name(security_context_t "scon ",
security_context_t "tcon ", security_class_t "tclass ", const char
*"objname ", security_context_t *" newcon );
+.sp
.BI "int security_compute_relabel(security_context_t "scon ",
security_context_t "tcon ", security_class_t "tclass ",
security_context_t *" newcon );
.sp
.BI "int security_compute_member(security_context_t "scon ",
security_context_t "tcon ", security_class_t "tclass ",
security_context_t *" newcon );
@@ -56,6 +58,19 @@ which indicates the decision is computed on a
permissive domain.
is used to compute a context to use for labeling a new object in a particular
class based on a SID pair.
+.B security_compute_create_name
+is identical to
+.B security_compute_create
+but also takes name of the new object in creation as an argument.
+When
+.BR TYPE_TRANSITION
+rule on the given class and a SID pair has object name extension,
+we shall be able to obtain a correct
+.BR newcon
+according to the security policy. Note that this interface is only
+supported on the linux 2.6.40 or later.
+In the older kernel, the object name will be simply ignored.
+
.B security_compute_relabel
is used to compute the new context to use when relabeling an object, it is used
in the pam_selinux.so source and the newrole source to determine the correct
diff --git a/libselinux/man/man3/security_compute_create_name.3
b/libselinux/man/man3/security_compute_create_name.3
new file mode 100644
index 0000000..a60bca4
--- /dev/null
+++ b/libselinux/man/man3/security_compute_create_name.3
@@ -0,0 +1 @@
+.so man3/security_compute_av.3
diff --git a/libselinux/src/compute_create.c b/libselinux/src/compute_create.c
index 0bbeeed..3c05be3 100644
--- a/libselinux/src/compute_create.c
+++ b/libselinux/src/compute_create.c
@@ -6,19 +6,58 @@
#include <errno.h>
#include <string.h>
#include <limits.h>
+#include <ctype.h>
#include "selinux_internal.h"
#include "policy.h"
#include "mapping.h"
-int security_compute_create_raw(const security_context_t scon,
- const security_context_t tcon,
- security_class_t tclass,
- security_context_t * newcon)
+static int object_name_encode(const char *objname, char *buffer, size_t buflen)
+{
+ int code;
+ size_t offset = 0;
+
+ if (buflen - offset < 1)
+ return -1;
+ buffer[offset++] = ' ';
+
+ do {
+ code = *objname++;
+
+ if (isalnum(code) || code == '\0' || code == '-' ||
+ code == '.' || code == '_' || code == '~') {
+ if (buflen - offset < 1)
+ return -1;
+ buffer[offset++] = code;
+ } else if (code == ' ') {
+ if (buflen - offset < 1)
+ return -1;
+ buffer[offset++] = '+';
+ } else {
+ static const char *table = "0123456789ABCDEF";
+ int l = (code & 0x0f);
+ int h = (code & 0xf0) >> 4;
+
+ if (buflen - offset < 3)
+ return -1;
+ buffer[offset++] = '%';
+ buffer[offset++] = table[h];
+ buffer[offset++] = table[l];
+ }
+ } while (code != '\0');
+
+ return 0;
+}
+
+int security_compute_create_name_raw(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ const char *objname,
+ security_context_t * newcon)
{
char path[PATH_MAX];
char *buf;
size_t size;
- int fd, ret;
+ int fd, ret, len;
if (!selinux_mnt) {
errno = ENOENT;
@@ -36,7 +75,14 @@ int security_compute_create_raw(const
security_context_t scon,
ret = -1;
goto out;
}
- snprintf(buf, size, "%s %s %hu", scon, tcon, unmap_class(tclass));
+ len = snprintf(buf, size, "%s %s %hu",
+ scon, tcon, unmap_class(tclass));
+ if (objname &&
+ object_name_encode(objname, buf + len, size - len) < 0) {
+ errno = ENAMETOOLONG;
+ ret = -1;
+ goto out2;
+ }
ret = write(fd, buf, strlen(buf));
if (ret < 0)
@@ -59,13 +105,23 @@ int security_compute_create_raw(const
security_context_t scon,
close(fd);
return ret;
}
+hidden_def(security_compute_create_name_raw)
+int security_compute_create_raw(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ security_context_t * newcon)
+{
+ return security_compute_create_name_raw(scon, tcon, tclass,
+ NULL, newcon);
+}
hidden_def(security_compute_create_raw)
-int security_compute_create(const security_context_t scon,
- const security_context_t tcon,
- security_class_t tclass,
- security_context_t * newcon)
+int security_compute_create_name(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ const char *objname,
+ security_context_t * newcon)
{
int ret;
security_context_t rscon;
@@ -79,8 +135,8 @@ int security_compute_create(const security_context_t scon,
return -1;
}
- ret = security_compute_create_raw(rscon, rtcon, tclass, &rnewcon);
-
+ ret = security_compute_create_name_raw(rscon, rtcon, tclass,
+ objname, &rnewcon);
freecon(rscon);
freecon(rtcon);
if (!ret) {
@@ -90,5 +146,13 @@ int security_compute_create(const security_context_t scon,
return ret;
}
+hidden_def(security_compute_create_name)
+int security_compute_create(const security_context_t scon,
+ const security_context_t tcon,
+ security_class_t tclass,
+ security_context_t * newcon)
+{
+ return security_compute_create_name(scon, tcon, tclass, NULL, newcon);
+}
hidden_def(security_compute_create)
diff --git a/libselinux/src/selinux_internal.h
b/libselinux/src/selinux_internal.h
index fdddfaf..3f14955 100644
--- a/libselinux/src/selinux_internal.h
+++ b/libselinux/src/selinux_internal.h
@@ -23,6 +23,8 @@ hidden_proto(selinux_mkload_policy)
hidden_proto(security_compute_user_raw)
hidden_proto(security_compute_create)
hidden_proto(security_compute_create_raw)
+ hidden_proto(security_compute_create_name)
+ hidden_proto(security_compute_create_name_raw)
hidden_proto(security_compute_member_raw)
hidden_proto(security_compute_relabel_raw)
hidden_proto(is_selinux_enabled)
--
KaiGai Kohei <kaigai@xxxxxxxxxxxx>
--
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