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platform_system_sepolicy/public/dnsmasq.te

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Make dnsmasq permissive or unconfined. Also add rules from our policy. Change-Id: I86f07f54c5120c511f9cab2877cf765c3ae7c1a8 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2013-10-29 19:42:35 +01:00
# DNS, DHCP services
Create attribute for moving perms out of domain Motivation: Domain is overly permissive. Start removing permissions from domain and assign them to the domain_deprecated attribute. Domain_deprecated and domain can initially be assigned to all domains. The goal is to not assign domain_deprecated to new domains and to start removing domain_deprecated where it is not required or reassigning the appropriate permissions to the inheriting domain when necessary. Bug: 25433265 Change-Id: I8b11cb137df7bdd382629c98d916a73fe276413c
2015-11-03 18:54:39 +01:00
type dnsmasq, domain, domain_deprecated;
Enable SELinux protections for netd. This change does several things: 1) Restore domain.te to the version present at cd516a32663b4eb11b2e3356b86450020e59e279 . This is the version currently being distributed in AOSP. 2) Add "allow domain properties_device:file r_file_perms;" to domain.te, to allow all domains to read /dev/__properties__ . This change was missing from AOSP. 3) Restore netd.te to the version present at 80c9ba5267f1a6ceffcf979471d101948b520ad6 . This is the version currently being distributed in AOSP. 4) Remove anything involving module loading from netd.te. CTS enforces that Android kernels can't have module loading enabled. 5) Add several new capabilities, plus data file rules, to netd.te, since netd needs to write to files owned by wifi. 6) Add a new unconfined domain called dnsmasq.te, and allow transitions from netd to that domain. Over time, we'll tighten up the dnsmasq.te domain. 7) Add a new unconfined domain called hostapd.te, and allow transitions from netd to that domain. Over time, we'll tighten up the hostapd.te domain. The net effect of these changes is to re-enable SELinux protections for netd. The policy is FAR from perfect, and allows a lot of wiggle room, but we can improve it over time. Testing: as much as possible, I've exercised networking related functionality, including turning on and off wifi, entering airplane mode, and enabling tethering and portable wifi hotspots. It's quite possible I've missed something, and if we experience problems, I can roll back this change. Bug: 9618347 Change-Id: I23ff3eebcef629bc7baabcf6962f25f116c4a3c0
2013-06-28 00:11:02 +02:00
type dnsmasq_exec, exec_type, file_type;
Clean up socket rules. Replace * or any permission set containing create with create_socket_perms or create_stream_socket_perms. Add net_domain() to all domains using network sockets and delete rules already covered by domain.te or net.te. For netlink_route_socket, only nlmsg_write needs to be separately granted to specific domains that are permitted to modify the routing table. Clarification: read/write permissions are just ability to perform read/recv() or write/send() on the socket, whereas nlmsg_read/ nlmsg_write permissions control ability to observe or modify the underlying kernel state accessed via the socket. See security/selinux/nlmsgtab.c in the kernel for the mapping of netlink message types to nlmsg_read or nlmsg_write. Delete legacy rule for b/12061011. This change does not touch any rules where only read/write were allowed to a socket created by another domain (inherited across exec or received across socket or binder IPC). We may wish to rewrite some or all of those rules with the rw_socket_perms macro but that is a separate change. Change-Id: Ib0637ab86f6d388043eff928e5d96beb02e5450e Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-02-24 21:06:11 +01:00
net_domain(dnsmasq)
Enforce ioctl command whitelisting on all sockets Remove the ioctl permission for most socket types. For others, such as tcp/udp/rawip/unix_dgram/unix_stream set a default unprivileged whitelist that individual domains may extend (except where neverallowed like untrusted_app). Enforce via a neverallowxperm rule. Change-Id: I15548d830f8eff1fd4d64005c5769ca2be8d4ffe
2016-05-17 06:12:17 +02:00
allowxperm dnsmasq self:udp_socket ioctl priv_sock_ioctls;
Clean up socket rules. Replace * or any permission set containing create with create_socket_perms or create_stream_socket_perms. Add net_domain() to all domains using network sockets and delete rules already covered by domain.te or net.te. For netlink_route_socket, only nlmsg_write needs to be separately granted to specific domains that are permitted to modify the routing table. Clarification: read/write permissions are just ability to perform read/recv() or write/send() on the socket, whereas nlmsg_read/ nlmsg_write permissions control ability to observe or modify the underlying kernel state accessed via the socket. See security/selinux/nlmsgtab.c in the kernel for the mapping of netlink message types to nlmsg_read or nlmsg_write. Delete legacy rule for b/12061011. This change does not touch any rules where only read/write were allowed to a socket created by another domain (inherited across exec or received across socket or binder IPC). We may wish to rewrite some or all of those rules with the rw_socket_perms macro but that is a separate change. Change-Id: Ib0637ab86f6d388043eff928e5d96beb02e5450e Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-02-24 21:06:11 +01:00
Allow dnsmasq dac_override capability. dnsmasq presently requires dac_override to create files under /data/misc/dhcp. Until it can be changed to run with group dhcp, allow dac_override. Addresses denials such as: avc: denied { dac_override } for pid=21166 comm="dnsmasq" capability=1 scontext=u:r:dnsmasq:s0 tcontext=u:r:dnsmasq:s0 tclass=capability Change-Id: Ic352dc7fc4ab44086c6b06cf727c48f29098f3a1 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-03-12 20:12:52 +01:00
# TODO: Run with dhcp group to avoid need for dac_override.
allow dnsmasq self:capability dac_override;
Address dnsmasq denials. Address dnsmasq denials such as: avc: denied { use } for pid=9145 comm="dnsmasq" path="pipe:[29234]" dev="pipefs" ino=29234 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=fd avc: denied { read } for pid=9145 comm="dnsmasq" path="pipe:[29234]" dev="pipefs" ino=29234 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=fifo_file avc: denied { read write } for pid=9145 comm="dnsmasq" path="socket:[7860]" dev="sockfs" ino=7860 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_kobject_uevent_socket avc: denied { read write } for pid=9145 comm="dnsmasq" path="socket:[8221]" dev="sockfs" ino=8221 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=unix_stream_socket avc: denied { read write } for pid=9523 comm="dnsmasq" path="socket:[7860]" dev="sockfs" ino=7860 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_kobject_uevent_socket avc: denied { read write } for pid=9523 comm="dnsmasq" path="socket:[7862]" dev="sockfs" ino=7862 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_route_socket avc: denied { net_raw } for pid=9607 comm="dnsmasq" capability=13 scontext=u:r:dnsmasq:s0 tcontext=u:r:dnsmasq:s0 tclass=capability avc: denied { net_admin } for pid=9607 comm="dnsmasq" capability=12 scontext=u:r:dnsmasq:s0 tcontext=u:r:dnsmasq:s0 tclass=capability Change-Id: I2bd1eaf22879f09df76a073028cc282362eebeee Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-03-07 20:46:38 +01:00
allow dnsmasq self:capability { net_admin net_raw net_bind_service setgid setuid };
Make dnsmasq permissive or unconfined. Also add rules from our policy. Change-Id: I86f07f54c5120c511f9cab2877cf765c3ae7c1a8 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2013-10-29 19:42:35 +01:00
allow dnsmasq dhcp_data_file:dir w_dir_perms;
allow dnsmasq dhcp_data_file:file create_file_perms;
Address dnsmasq denials. Address dnsmasq denials such as: avc: denied { use } for pid=9145 comm="dnsmasq" path="pipe:[29234]" dev="pipefs" ino=29234 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=fd avc: denied { read } for pid=9145 comm="dnsmasq" path="pipe:[29234]" dev="pipefs" ino=29234 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=fifo_file avc: denied { read write } for pid=9145 comm="dnsmasq" path="socket:[7860]" dev="sockfs" ino=7860 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_kobject_uevent_socket avc: denied { read write } for pid=9145 comm="dnsmasq" path="socket:[8221]" dev="sockfs" ino=8221 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=unix_stream_socket avc: denied { read write } for pid=9523 comm="dnsmasq" path="socket:[7860]" dev="sockfs" ino=7860 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_kobject_uevent_socket avc: denied { read write } for pid=9523 comm="dnsmasq" path="socket:[7862]" dev="sockfs" ino=7862 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=netlink_route_socket avc: denied { net_raw } for pid=9607 comm="dnsmasq" capability=13 scontext=u:r:dnsmasq:s0 tcontext=u:r:dnsmasq:s0 tclass=capability avc: denied { net_admin } for pid=9607 comm="dnsmasq" capability=12 scontext=u:r:dnsmasq:s0 tcontext=u:r:dnsmasq:s0 tclass=capability Change-Id: I2bd1eaf22879f09df76a073028cc282362eebeee Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-03-07 20:46:38 +01:00
# Inherit and use open files from netd.
allow dnsmasq netd:fd use;
allow dnsmasq netd:fifo_file { read write };
# TODO: Investigate whether these inherited sockets should be closed on exec.
allow dnsmasq netd:netlink_kobject_uevent_socket { read write };
allow dnsmasq netd:netlink_nflog_socket { read write };
allow dnsmasq netd:netlink_route_socket { read write };
allow dnsmasq netd:unix_stream_socket { read write };
Allow netd-spawned domains to use inherited netd unix_dgram_socket. Resolves denials such as: avc: denied { read write } for pid=4346 comm="hostapd" path="socket:[7874]" dev="sockfs" ino=7874 scontext=u:r:hostapd:s0 tcontext=u:r:netd:s0 tclass=unix_dgram_socket avc: denied { read write } for pid=4348 comm="dnsmasq" path="socket:[7874]" dev="sockfs" ino=7874 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=unix_dgram_socket Change-Id: Ie82f39c32c6e04bc9ef1369ca787cf80b3b4141c Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-03-18 15:45:15 +01:00
allow dnsmasq netd:unix_dgram_socket { read write };
Allow dnsmasq to inherit/use netd UDP socket. Addresses denials such as: avc: denied { read write } for comm="dnsmasq" path="socket:[1054090]" dev="sockfs" ino=1054090 scontext=u:r:dnsmasq:s0 tcontext=u:r:netd:s0 tclass=udp_socket This may not be needed (need to check netd to see if it should be closing all of these sockets before exec'ing other programs), but should be harmless. Change-Id: I77c7af5e050e039fd48322914eeabbcb8a716040 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-06-11 15:05:32 +02:00
allow dnsmasq netd:udp_socket { read write };
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