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Catherine Zhang 877ce7c1b3 [AF_UNIX]: Datagram getpeersec 
This patch implements an API whereby an application can determine the
label of its peer's Unix datagram sockets via the auxiliary data mechanism of
recvmsg.

Patch purpose:

This patch enables a security-aware application to retrieve the
security context of the peer of a Unix datagram socket.  The application
can then use this security context to determine the security context for
processing on behalf of the peer who sent the packet.

Patch design and implementation:

The design and implementation is very similar to the UDP case for INET
sockets.  Basically we build upon the existing Unix domain socket API for
retrieving user credentials.  Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).  To retrieve the security
context, the application first indicates to the kernel such desire by
setting the SO_PASSSEC option via getsockopt.  Then the application
retrieves the security context using the auxiliary data mechanism.

An example server application for Unix datagram socket should look like this:

toggle = 1;
toggle_len = sizeof(toggle);

setsockopt(sockfd, SOL_SOCKET, SO_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
    cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
    if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
        cmsg_hdr->cmsg_level == SOL_SOCKET &&
        cmsg_hdr->cmsg_type == SCM_SECURITY) {
        memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
    }
}

sock_setsockopt is enhanced with a new socket option SOCK_PASSSEC to allow
a server socket to receive security context of the peer.

Testing:

We have tested the patch by setting up Unix datagram client and server
applications.  We verified that the server can retrieve the security context
using the auxiliary data mechanism of recvmsg.

Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2006-06-29 16:58:06 -07:00
..
platform-iss [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 8 2005-06-24 00:05:22 -07:00
xtensa [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 7 2005-06-24 00:05:22 -07:00
a.out.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
atomic.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [PATCH] bitops: xtensa: use generic bitops 2006-03-26 08:57:15 -08:00
bootparam.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
bug.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
bugs.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
byteorder.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
cache.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
cacheflush.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
checksum.h [PATCH] xtensa: remove verify_area macros 2006-06-23 07:43:02 -07:00
coprocessor.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
cpumask.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
cputime.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
current.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
delay.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
div64.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
dma-mapping.h [PATCH] gfp_t: dma-mapping (xtensa) 2005-10-28 08:16:49 -07:00
dma.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
elf.h [PATCH] fix remaining missing includes 2005-11-07 07:53:41 -08:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h [PATCH] xtensa: cleanups for errno and ipc. 2005-06-30 08:45:10 -07:00
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fixmap.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
futex.h [PATCH] xtensa: add asm/futex.h 2006-02-01 08:53:23 -08:00
hardirq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
highmem.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
hw_irq.h [PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend() 2006-06-29 10:26:23 -07:00
ide.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
io.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h [PATCH] xtensa: Fix TIOCGICOUNT macro 2006-04-20 07:54:03 -07:00
ipcbuf.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
irq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
kmap_types.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
linkage.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
local.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
mmu_context.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
module.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
msgbuf.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
page.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
param.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
pci-bridge.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
pci.h [PATCH] xtensa: replace 'extern inline' with 'static inline' 2005-09-05 00:06:25 -07:00
percpu.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
pgalloc.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
pgtable.h [PATCH] fix remaining missing includes 2005-11-07 07:53:41 -08:00
platform.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
poll.h [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications 2006-03-25 08:22:56 -08:00
posix_types.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
processor.h [PATCH] xtensa: task_pt_regs(), task_stack_page() 2006-01-12 09:08:54 -08:00
ptrace.h [PATCH] xtensa: task_pt_regs(), task_stack_page() 2006-01-12 09:08:54 -08:00
resource.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
rmap.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
rwsem.h [PATCH] xtensa: remove verify_area macros 2006-06-23 07:43:02 -07:00
scatterlist.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
sections.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
segment.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
semaphore.h [PATCH] xtensa: struct semaphore.sleepers initialization 2005-11-07 07:53:32 -08:00
sembuf.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
serial.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
setup.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
shmbuf.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
shmparam.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
sigcontext.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
siginfo.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
signal.h [PATCH] request_irq(): remove warnings from irq probing 2006-04-28 08:33:46 -07:00
smp.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
socket.h [AF_UNIX]: Datagram getpeersec 2006-06-29 16:58:06 -07:00
sockios.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
spinlock.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
stat.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
statfs.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
string.h [PATCH] xtensa: replace 'extern inline' with 'static inline' 2005-09-05 00:06:25 -07:00
system.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
termbits.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
termios.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
thread_info.h [PATCH] death of get_thread_info/put_thread_info 2006-01-12 09:08:59 -08:00
timex.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
tlb.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
tlbflush.h [PATCH] xtensa: replace 'extern inline' with 'static inline' 2005-09-05 00:06:25 -07:00
topology.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
types.h [PATCH] sab: consolidate kmem_bufctl_t 2005-09-05 00:05:48 -07:00
uaccess.h [PATCH] xtensa: remove verify_area macros 2006-06-23 07:43:02 -07:00
ucontext.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
unaligned.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
unistd.h Remove unneeded _syscallX macros from user view in asm-*/unistd.h 2006-04-29 01:51:47 +01:00
user.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
xor.h [PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6 2005-06-24 00:05:22 -07:00