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
..
a.out.h
Linux-2.6.12-rc2
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atomic.h
[PATCH] frv: NULL noise removal in frv xchg()
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auxvec.h
[PATCH] auxiliary vector cleanups
2005-09-07 16:57:21 -07:00
ax88796.h
Linux-2.6.12-rc2
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bitops.h
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bug.h
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bugs.h
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busctl-regs.h
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byteorder.h
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cache.h
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cacheflush.h
[PATCH] FRV: Miscellaneous fixes
2006-02-14 16:09:35 -08:00
checksum.h
[PATCH] frv: misc __user annotations
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cpu-irqs.h
Linux-2.6.12-rc2
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cpumask.h
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cputime.h
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current.h
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delay.h
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div64.h
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dm9000.h
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dma-mapping.h
[PATCH] frv: miscellaneous changes
2006-01-08 20:13:38 -08:00
dma.h
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2006-04-26 12:56:16 +01:00
elf.h
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emergency-restart.h
[PATCH] Add emergency_restart()
2005-07-26 14:35:41 -07:00
errno.h
Linux-2.6.12-rc2
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fcntl.h
[PATCH] Clean up struct flock64 definitions
2005-09-07 16:57:38 -07:00
fpu.h
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2006-04-26 12:56:16 +01:00
futex.h
[PATCH] lightweight robust futexes updates
2006-03-27 08:44:49 -08:00
gdb-stub.h
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gpio-regs.h
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hardirq.h
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2006-04-26 12:56:16 +01:00
highmem.h
[PATCH] frv: misc sparse annotations
2006-06-23 07:42:55 -07:00
hw_irq.h
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ide.h
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init.h
Linux-2.6.12-rc2
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io.h
[PATCH] frv: Add missing qualifier to memcpy_fromio() prototype
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ioctl.h
[PATCH] Generic ioctl.h
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ioctls.h
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ipc.h
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ipcbuf.h
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irc-regs.h
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irq-routing.h
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irq.h
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kmap_types.h
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linkage.h
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local.h
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math-emu.h
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mb-regs.h
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2006-06-23 07:42:54 -07:00
mb86943a.h
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mb93091-fpga-irqs.h
Linux-2.6.12-rc2
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mb93093-fpga-irqs.h
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mb93493-irqs.h
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mb93493-regs.h
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mc146818rtc.h
[PATCH] frv: miscellaneous changes
2006-01-08 20:13:38 -08:00
mem-layout.h
Linux-2.6.12-rc2
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mman.h
[PATCH] add asm-generic/mman.h
2006-02-15 15:32:22 -08:00
mmu.h
Linux-2.6.12-rc2
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mmu_context.h
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module.h
[PATCH] frv: add module support stubs
2006-01-08 20:13:37 -08:00
msgbuf.h
Linux-2.6.12-rc2
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mutex.h
[PATCH] mutex subsystem, add default include/asm-*/mutex.h files
2006-01-09 15:59:19 -08:00
namei.h
Linux-2.6.12-rc2
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page.h
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param.h
Linux-2.6.12-rc2
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pci.h
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percpu.h
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pgalloc.h
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pgtable.h
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poll.h
[PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications
2006-03-25 08:22:56 -08:00
posix_types.h
Linux-2.6.12-rc2
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processor.h
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ptrace.h
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registers.h
Linux-2.6.12-rc2
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resource.h
Linux-2.6.12-rc2
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scatterlist.h
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sections.h
Linux-2.6.12-rc2
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segment.h
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semaphore.h
[PATCH] FRV: Make the FRV arch work again
2005-11-28 14:42:23 -08:00
sembuf.h
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serial-regs.h
Linux-2.6.12-rc2
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serial.h
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setup.h
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shmbuf.h
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shmparam.h
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sigcontext.h
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siginfo.h
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signal.h
[PATCH] frv: signal annotations
2006-06-23 07:42:54 -07:00
smp.h
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2006-04-26 12:56:16 +01:00
socket.h
[AF_UNIX]: Datagram getpeersec
2006-06-29 16:58:06 -07:00
sockios.h
Linux-2.6.12-rc2
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spinlock.h
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spr-regs.h
[PATCH] FRV: Use virtual interrupt disablement
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stat.h
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statfs.h
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string.h
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suspend.h
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system.h
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termbits.h
Linux-2.6.12-rc2
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termios.h
Linux-2.6.12-rc2
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thread_info.h
[PATCH] Handle TIF_RESTORE_SIGMASK for FRV
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timer-regs.h
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timex.h
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tlb.h
Linux-2.6.12-rc2
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tlbflush.h
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topology.h
Linux-2.6.12-rc2
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types.h
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uaccess.h
[PATCH] frv: __user infrastructure
2006-06-23 07:42:54 -07:00
ucontext.h
Linux-2.6.12-rc2
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unaligned.h
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unistd.h
[PATCH] frv: clean frv unistd.h
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user.h
Linux-2.6.12-rc2
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vga.h
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virtconvert.h
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xor.h
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