Does it run as 'root'? -Ross > -----Original Message----- > From: centos-bounces@xxxxxxxxxx > [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of S Roderick > Sent: Friday, March 07, 2008 3:28 PM > To: CentOS mailing list > Subject: Re: Unable open raw socket in CentOS 5 - SE > Linux and kernelcapability interaction? > > Does anyone have any idea on this one? Based on everything > we've tried > with kernel capabilities and SE Linux parameters, we're missing > something. Have tried everything we can find online. > > Thanks > Stephen > > On Mar 3, 2008, at 09:14 , S Roderick wrote: > > > I am wondering what is the interaction between SE Linux and the > > kernel "capabilities" in CentOS 5.1? I'm trying to open a > raw socket > > and keep getting permission denied errors. I've tried using > the lcap > > library to find that CAP_SETPCAP appears to be off in the kernel. > > For compliance reasons, I don't want to turn this on. I've also > > tried a hand-crafted SE Linux module policy. I have verified that > > the test program runs in the correct SE Linux domain and it > > generates no audit errors, but it still fails to open the > port with > > permission denied. > > > > It appears that SE Linux is not preventing the socket being > created > > (as evidenced by the lack of audit messages), so what am I > missing? > > Do I still need to modify capabilities within the program, even if > > I'm using an SE Linux policy? > > > > Thanks > > S > > > > Source file > > > > #include <stdio.h> > > #include <unistd.h> > > #include <errno.h> > > #include <string.h> > > #include <sys/socket.h> > > #include <sys/types.h> > > #include <sys/prctl.h> > > #include <netinet/in.h> > > > > int > > main(void) > > { > > int fd = socket(PF_INET, SOCK_RAW, IPPROTO_TCP); > > if (-1 == fd) > > { > > printf("Failed to open raw socket: %d=%s\n", errno, > > strerror(errno)); > > } > > else > > { > > printf("Socket opened successfully\n"); > > close(fd); > > } > > return 0; > > } > > > > > > SElinux .te file > > > > policy_module(rawsox,1.0.0) > > > > ######################################## > > # Declarations > > > > type rawsox_t; > > type rawsox_exec_t; > > domain_type(rawsox_t) > > domain_entry_file(rawsox_t, rawsox_exec_t) > > domain_auto_trans(unconfined_t,rawsox_exec_t,rawsox_t) > > > > ######################################## > > # Rawsox local policy > > > > # these two didn't help > > #corenet_raw_sendrecv_all_if( rawsox_t ); > > #corenet_raw_sendrecv_all_nodes( rawsox_t ); > > > > require { > > type lib_t; > > type ld_so_t; > > type ld_so_cache_t; > > type usr_t; > > type devpts_t; > > type rawsox_t; > > type etc_t; > > class lnk_file read; > > class dir search; > > class file { read getattr execute }; > > class chr_file { read write getattr }; > > class rawip_socket create; > > class capability net_raw; > > } > > > > #============= rawsox_t ============== > > allow rawsox_t devpts_t:chr_file { read write getattr }; > > allow rawsox_t etc_t:dir search; > > allow rawsox_t ld_so_cache_t:file { read getattr }; > > allow rawsox_t ld_so_t:file read; > > allow rawsox_t lib_t:dir search; > > allow rawsox_t lib_t:file { read getattr execute }; > > allow rawsox_t lib_t:lnk_file read; > > allow rawsox_t usr_t:dir search; > > > > allow rawsox_t self:capability { net_raw setuid }; > > allow rawsox_t self:rawip_socket { create ioctl read write bind > > getopt setopt }; > > allow rawsox_t self:unix_stream_socket { create_socket_perms }; > > > > _______________________________________________ > CentOS mailing list > CentOS@xxxxxxxxxx > http://lists.centos.org/mailman/listinfo/centos > ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
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