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  1. # Author: Jamie Strandboge <jamie@canonical.com>
  2. #include <tunables/global>
  3.  
  4. /usr/lib/snapd/snap-confine (attach_disconnected) {
  5. # Include any additional files that snapd chose to generate.
  6. # - for $HOME on NFS
  7. # - for $HOME on encrypted media
  8. #
  9. # Those are discussed on https://forum.snapcraft.io/t/snapd-vs-upstream-kernel-vs-apparmor
  10. # and https://forum.snapcraft.io/t/snaps-and-nfs-home/
  11. #include "/var/lib/snapd/apparmor/snap-confine"
  12.  
  13. # We run privileged, so be fanatical about what we include and don't use
  14. # any abstractions
  15. /etc/ld.so.cache r,
  16. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}ld-*.so mrix,
  17. # libc, you are funny
  18. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libc{,-[0-9]*}.so* mr,
  19. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libpthread{,-[0-9]*}.so* mr,
  20. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libreadline{,-[0-9]*}.so* mr,
  21. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}librt{,-[0-9]*}.so* mr,
  22. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libgcc_s.so* mr,
  23. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libncursesw{,-[0-9]*}.so* mr,
  24. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libresolv{,-[0-9]*}.so* mr,
  25. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libselinux.so* mr,
  26. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libpcre.so* mr,
  27. # normal libs in order
  28. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libapparmor.so* mr,
  29. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libcgmanager.so* mr,
  30. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libdl{,-[0-9]*}.so* mr,
  31. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libnih.so* mr,
  32. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libnih-dbus.so* mr,
  33. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libdbus-1.so* mr,
  34. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libudev.so* mr,
  35. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libseccomp.so* mr,
  36. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libcap.so* mr,
  37.  
  38. /usr/lib/snapd/snap-confine mr,
  39.  
  40. /dev/null rw,
  41. /dev/full rw,
  42. /dev/zero rw,
  43. /dev/random r,
  44. /dev/urandom r,
  45. /dev/pts/[0-9]* rw,
  46. /dev/tty rw,
  47.  
  48. # cgroup: devices
  49. capability sys_admin,
  50. capability dac_override,
  51. /sys/fs/cgroup/devices/snap{,py}.*/ w,
  52. /sys/fs/cgroup/devices/snap{,py}.*/tasks w,
  53. /sys/fs/cgroup/devices/snap{,py}.*/devices.{allow,deny} w,
  54.  
  55. # cgroup: freezer
  56. # Allow creating per-snap cgroup freezers and adding snap command (task)
  57. # invocations to the freezer. This allows for reliably enumerating all
  58. # running tasks for the snap. In addition, allow enumerating processes in
  59. # the cgroup to determine if it is occupied.
  60. /sys/fs/cgroup/freezer/ r,
  61. /sys/fs/cgroup/freezer/snap.*/ w,
  62. /sys/fs/cgroup/freezer/snap.*/tasks w,
  63. /sys/fs/cgroup/freezer/snap.*/cgroup.procs r,
  64.  
  65. # querying udev
  66. /etc/udev/udev.conf r,
  67. /sys/**/uevent r,
  68. /usr/lib/snapd/snap-device-helper ixr, # drop
  69. /lib/udev/snappy-app-dev ixr, # drop
  70. /run/udev/** rw,
  71. /{,usr/}bin/tr ixr,
  72. /usr/lib/locale/** r,
  73. /usr/lib/@{multiarch}/gconv/gconv-modules r,
  74. /usr/lib/@{multiarch}/gconv/gconv-modules.cache r,
  75.  
  76. # priv dropping
  77. capability setuid,
  78. capability setgid,
  79.  
  80. # changing profile
  81. @{PROC}/[0-9]*/attr/exec w,
  82. # Reading current profile
  83. @{PROC}/[0-9]*/attr/current r,
  84. # Reading available filesystems
  85. @{PROC}/filesystems r,
  86.  
  87. # To find where apparmor is mounted
  88. @{PROC}/[0-9]*/mounts r,
  89. # To find if apparmor is enabled
  90. /sys/module/apparmor/parameters/enabled r,
  91.  
  92. # Don't allow changing profile to unconfined or profiles that start with
  93. # '/'. Use 'unsafe' to support snap-exec on armhf and its reliance on
  94. # the environment for determining the capabilities of the architecture.
  95. # 'unsafe' is ok here because the kernel will have already cleared the
  96. # environment as part of launching snap-confine with
  97. # CAP_SYS_ADMIN.
  98. change_profile unsafe /** -> [^u/]**,
  99. change_profile unsafe /** -> u[^n]**,
  100. change_profile unsafe /** -> un[^c]**,
  101. change_profile unsafe /** -> unc[^o]**,
  102. change_profile unsafe /** -> unco[^n]**,
  103. change_profile unsafe /** -> uncon[^f]**,
  104. change_profile unsafe /** -> unconf[^i]**,
  105. change_profile unsafe /** -> unconfi[^n]**,
  106. change_profile unsafe /** -> unconfin[^e]**,
  107. change_profile unsafe /** -> unconfine[^d]**,
  108. change_profile unsafe /** -> unconfined?**,
  109.  
  110. # allow changing to a few not caught above
  111. change_profile unsafe /** -> {u,un,unc,unco,uncon,unconf,unconfi,unconfin,unconfine},
  112.  
  113. # LP: #1446794 - when this bug is fixed, change the above to:
  114. # deny change_profile unsafe /** -> {unconfined,/**},
  115. # change_profile unsafe /** -> **,
  116.  
  117. # reading seccomp filters
  118. /{tmp/snap.rootfs_*/,}var/lib/snapd/seccomp/bpf/*.bin r,
  119.  
  120. # ensuring correct permissions in sc_quirk_create_writable_mimic
  121. /{tmp/snap.rootfs_*/,}var/lib/ rw,
  122.  
  123. # LP: #1668659
  124. mount options=(rw rbind) /snap/ -> /snap/,
  125. mount options=(rw rshared) -> /snap/,
  126.  
  127. # boostrapping the mount namespace
  128. mount options=(rw rshared) -> /,
  129. mount options=(rw bind) /tmp/snap.rootfs_*/ -> /tmp/snap.rootfs_*/,
  130. mount options=(rw unbindable) -> /tmp/snap.rootfs_*/,
  131. # the next line is for classic system
  132. mount options=(rw rbind) /snap/*/*/ -> /tmp/snap.rootfs_*/,
  133. # the next line is for core system
  134. mount options=(rw rbind) / -> /tmp/snap.rootfs_*/,
  135. # all of the constructed rootfs is a rslave
  136. mount options=(rw rslave) -> /tmp/snap.rootfs_*/,
  137. # bidirectional mounts (for both classic and core)
  138. # NOTE: this doesn't capture the MERGED_USR configuration option so that
  139. # when a distro with merged /usr and / that uses apparmor shows up it
  140. # should be handled here.
  141. /{,run/}media/ w,
  142. mount options=(rw rbind) /media/ -> /tmp/snap.rootfs_*/media/,
  143. /run/netns/ w,
  144. mount options=(rw rbind) /run/netns/ -> /tmp/snap.rootfs_*/run/netns/,
  145. # unidirectional mounts (only for classic system)
  146. mount options=(rw rbind) /dev/ -> /tmp/snap.rootfs_*/dev/,
  147. mount options=(rw rslave) -> /tmp/snap.rootfs_*/dev/,
  148.  
  149. mount options=(rw rbind) /etc/ -> /tmp/snap.rootfs_*/etc/,
  150. mount options=(rw rslave) -> /tmp/snap.rootfs_*/etc/,
  151.  
  152. mount options=(rw rbind) /home/ -> /tmp/snap.rootfs_*/home/,
  153. mount options=(rw rslave) -> /tmp/snap.rootfs_*/home/,
  154.  
  155. mount options=(rw rbind) /root/ -> /tmp/snap.rootfs_*/root/,
  156. mount options=(rw rslave) -> /tmp/snap.rootfs_*/root/,
  157.  
  158. mount options=(rw rbind) /proc/ -> /tmp/snap.rootfs_*/proc/,
  159. mount options=(rw rslave) -> /tmp/snap.rootfs_*/proc/,
  160.  
  161. mount options=(rw rbind) /sys/ -> /tmp/snap.rootfs_*/sys/,
  162. mount options=(rw rslave) -> /tmp/snap.rootfs_*/sys/,
  163.  
  164. mount options=(rw rbind) /tmp/ -> /tmp/snap.rootfs_*/tmp/,
  165. mount options=(rw rslave) -> /tmp/snap.rootfs_*/tmp/,
  166.  
  167. mount options=(rw rbind) /var/lib/snapd/ -> /tmp/snap.rootfs_*/var/lib/snapd/,
  168. mount options=(rw rslave) -> /tmp/snap.rootfs_*/var/lib/snapd/,
  169.  
  170. mount options=(rw rbind) /var/snap/ -> /tmp/snap.rootfs_*/var/snap/,
  171. mount options=(rw rslave) -> /tmp/snap.rootfs_*/var/snap/,
  172.  
  173. mount options=(rw rbind) /var/tmp/ -> /tmp/snap.rootfs_*/var/tmp/,
  174. mount options=(rw rslave) -> /tmp/snap.rootfs_*/var/tmp/,
  175.  
  176. mount options=(rw rbind) /run/ -> /tmp/snap.rootfs_*/run/,
  177. mount options=(rw rslave) -> /tmp/snap.rootfs_*/run/,
  178.  
  179. mount options=(rw rbind) {,/usr}/lib{,32,64,x32}/modules/ -> /tmp/snap.rootfs_*{,/usr}/lib/modules/,
  180. mount options=(rw rslave) -> /tmp/snap.rootfs_*{,/usr}/lib/modules/,
  181.  
  182. mount options=(rw rbind) /var/log/ -> /tmp/snap.rootfs_*/var/log/,
  183. mount options=(rw rslave) -> /tmp/snap.rootfs_*/var/log/,
  184.  
  185. mount options=(rw rbind) /usr/src/ -> /tmp/snap.rootfs_*/usr/src/,
  186. mount options=(rw rslave) -> /tmp/snap.rootfs_*/usr/src/,
  187.  
  188. # allow making host snap-exec available inside base snaps
  189. mount options=(rw bind) /usr/lib/snapd/ -> /tmp/snap.rootfs_*/usr/lib/snapd/,
  190. mount options=(rw slave) -> /tmp/snap.rootfs_*/usr/lib/snapd/,
  191.  
  192. # allow making re-execed host snap-exec available inside base snaps
  193. mount options=(ro bind) /snap/core/*/usr/lib/snapd/ -> /tmp/snap.rootfs_*/usr/lib/snapd/,
  194.  
  195. mount options=(rw bind) /usr/bin/snapctl -> /tmp/snap.rootfs_*/usr/bin/snapctl,
  196. mount options=(rw slave) -> /tmp/snap.rootfs_*/usr/bin/snapctl,
  197.  
  198. # /etc/alternatives (classic)
  199. mount options=(rw bind) /snap/{,ubuntu-}core/*/etc/alternatives/ -> /tmp/snap.rootfs_*/etc/alternatives/,
  200. mount options=(rw bind) /snap/*/*/etc/ssl/ -> /tmp/snap.rootfs_*/etc/ssl/,
  201. mount options=(rw bind) /snap/*/*/etc/nsswitch.conf -> /tmp/snap.rootfs_*/etc/nsswitch.conf,
  202. # /etc/alternatives (core)
  203. mount options=(rw bind) /etc/alternatives/ -> /tmp/snap.rootfs_*/etc/alternatives/,
  204. mount options=(rw slave) -> /tmp/snap.rootfs_*/etc/alternatives/,
  205. mount options=(rw slave) -> /tmp/snap.rootfs_*/etc/ssl/,
  206. mount options=(rw slave) -> /tmp/snap.rootfs_*/etc/nsswitch.conf,
  207. # the /snap directory
  208. mount options=(rw rbind) /snap/ -> /tmp/snap.rootfs_*/snap/,
  209. mount options=(rw rslave) -> /tmp/snap.rootfs_*/snap/,
  210. # pivot_root preparation and execution
  211. mount options=(rw bind) /tmp/snap.rootfs_*/var/lib/snapd/hostfs/ -> /tmp/snap.rootfs_*/var/lib/snapd/hostfs/,
  212. mount options=(rw private) -> /tmp/snap.rootfs_*/var/lib/snapd/hostfs/,
  213. pivot_root,
  214. # cleanup
  215. umount /var/lib/snapd/hostfs/tmp/snap.rootfs_*/,
  216. umount /var/lib/snapd/hostfs/sys/,
  217. umount /var/lib/snapd/hostfs/dev/,
  218. umount /var/lib/snapd/hostfs/proc/,
  219. mount options=(rw rslave) -> /var/lib/snapd/hostfs/,
  220.  
  221. # Allow reading the os-release file (possibly a symlink to /usr/lib).
  222. /{etc/,usr/lib/}os-release r,
  223.  
  224. # set up snap-specific private /tmp dir
  225. capability chown,
  226. /tmp/ w,
  227. /tmp/snap.*/ w,
  228. /tmp/snap.*/tmp/ w,
  229. mount options=(rw private) -> /tmp/,
  230. mount options=(rw bind) /tmp/snap.*/tmp/ -> /tmp/,
  231. mount fstype=devpts options=(rw) devpts -> /dev/pts/,
  232. mount options=(rw bind) /dev/pts/ptmx -> /dev/ptmx, # for bind mounting
  233. mount options=(rw bind) /dev/pts/ptmx -> /dev/pts/ptmx, # for bind mounting under LXD
  234. # Workaround for LP: #1584456 on older kernels that mistakenly think
  235. # /dev/pts/ptmx needs a trailing '/'
  236. mount options=(rw bind) /dev/pts/ptmx/ -> /dev/ptmx/,
  237. mount options=(rw bind) /dev/pts/ptmx/ -> /dev/pts/ptmx/,
  238.  
  239. # for running snaps on classic
  240. /snap/ r,
  241. /snap/** r,
  242. /snap/ r,
  243. /snap/** r,
  244.  
  245. # NOTE: at this stage the /snap directory is stable as we have called
  246. # pivot_root already.
  247.  
  248. # nvidia handling, glob needs /usr/** and the launcher must be
  249. # able to bind mount the nvidia dir
  250. /sys/module/nvidia/version r,
  251. /sys/**/drivers/nvidia{,_*}/* r,
  252. /sys/**/nvidia*/uevent r,
  253. /sys/module/nvidia{,_*}/* r,
  254. /dev/nvidia[0-9]* r,
  255. /dev/nvidiactl r,
  256. /dev/nvidia-uvm r,
  257. /usr/** r,
  258. mount options=(rw bind) /usr/lib{,32}/nvidia-*/ -> /{tmp/snap.rootfs_*/,}var/lib/snapd/lib/gl{,32}/,
  259. mount options=(rw bind) /usr/lib{,32}/nvidia-*/ -> /{tmp/snap.rootfs_*/,}var/lib/snapd/lib/gl{,32}/,
  260. /tmp/snap.rootfs_*/var/lib/snapd/lib/gl{,32}/{,*} w,
  261. mount fstype=tmpfs options=(rw nodev noexec) none -> /tmp/snap.rootfs_*/var/lib/snapd/lib/gl{,32}/,
  262. mount options=(remount ro) -> /tmp/snap.rootfs_*/var/lib/snapd/lib/gl{,32}/,
  263.  
  264. # Vulkan support
  265. /tmp/snap.rootfs_*/var/lib/snapd/lib/vulkan/{,*} w,
  266. mount fstype=tmpfs options=(rw nodev noexec) none -> /tmp/snap.rootfs_*/var/lib/snapd/lib/vulkan/,
  267. mount options=(remount ro) -> /tmp/snap.rootfs_*/var/lib/snapd/lib/vulkan/,
  268.  
  269. # create gl dirs as needed
  270. /tmp/snap.rootfs_*/ r,
  271. /tmp/snap.rootfs_*/var/ r,
  272. /tmp/snap.rootfs_*/var/lib/ r,
  273. /tmp/snap.rootfs_*/var/lib/snapd/ r,
  274. /tmp/snap.rootfs_*/var/lib/snapd/lib/ r,
  275. /tmp/snap.rootfs_*/var/lib/snapd/lib/gl{,32}/ r,
  276. /tmp/snap.rootfs_*/var/lib/snapd/lib/gl{,32}/** rw,
  277. /tmp/snap.rootfs_*/var/lib/snapd/lib/vulkan/ r,
  278. /tmp/snap.rootfs_*/var/lib/snapd/lib/vulkan/** rw,
  279.  
  280. # for chroot on steroids, we use pivot_root as a better chroot that makes
  281. # apparmor rules behave the same on classic and outside of classic.
  282.  
  283. # for creating the user data directories: ~/snap, ~/snap/<name> and
  284. # ~/snap/<name>/<version>
  285. / r,
  286. @{HOMEDIRS}/ r,
  287. # These should both have 'owner' match but due to LP: #1466234, we can't
  288. # yet
  289. @{HOME}/ r,
  290. @{HOME}/snap/{,*/,*/*/} rw,
  291.  
  292. # for creating the user shared memory directories
  293. /{dev,run}/{,shm/} r,
  294. # This should both have 'owner' match but due to LP: #1466234, we can't yet
  295. /{dev,run}/shm/{,*/,*/*/} rw,
  296.  
  297. # for creating the user XDG_RUNTIME_DIR: /run/user, /run/user/UID and
  298. # /run/user/UID/<name>
  299. /run/user/{,[0-9]*/,[0-9]*/*/} rw,
  300.  
  301. # Workaround https://launchpad.net/bugs/359338 until upstream handles
  302. # stacked filesystems generally.
  303. # encrypted ~/.Private and old-style encrypted $HOME
  304. @{HOME}/.Private/ r,
  305. @{HOME}/.Private/** mrixwlk,
  306. # new-style encrypted $HOME
  307. @{HOMEDIRS}/.ecryptfs/*/.Private/ r,
  308. @{HOMEDIRS}/.ecryptfs/*/.Private/** mrixwlk,
  309.  
  310. # Allow snap-confine to move to the void
  311. /var/lib/snapd/void/ r,
  312.  
  313. # Allow snap-confine to read snap contexts
  314. /var/lib/snapd/context/snap.* r,
  315.  
  316. # Allow snap-confine to unmount stale mount namespaces.
  317. umount /run/snapd/ns/*.mnt,
  318. # Required to correctly unmount bound mount namespace.
  319. # See LP: #1735459 for details.
  320. umount /,
  321.  
  322. # Support for the quirk system
  323. /var/ r,
  324. /var/lib/ r,
  325. /var/lib/** rw,
  326. /tmp/ r,
  327. /tmp/snapd.quirks_*/ rw,
  328. mount options=(move) /var/lib/snapd/ -> /tmp/snapd.quirks_*/,
  329. mount fstype=tmpfs options=(rw nodev nosuid) none -> /var/lib/,
  330. mount options=(ro rbind) /snap/{,ubuntu-}core/*/var/lib/** -> /var/lib/**,
  331. umount /var/lib/snapd/,
  332. mount options=(move) /tmp/snapd.quirks_*/ -> /var/lib/snapd/,
  333. # On classic systems with a setuid root snap-confine when run by non-root
  334. # user, the mimic_dir is created with the gid of the calling user (ie,
  335. # not '0') so when setting the permissions (chmod) of the mimicked
  336. # directory to that of the reference directory, a CAP_FSETID is triggered.
  337. # snap-confine sets the directory up correctly, so simply silence the
  338. # denial since we don't want to grant the capability as a whole to
  339. # snap-confine.
  340. deny capability fsetid,
  341.  
  342. # support for the LXD quirk
  343. mount options=(rw rbind nodev nosuid noexec) /var/lib/snapd/hostfs/var/lib/lxd/ -> /var/lib/lxd/,
  344. /var/lib/lxd/ w,
  345. /var/lib/snapd/hostfs/var/lib/lxd r,
  346.  
  347. # support for locking
  348. /run/snapd/lock/ rw,
  349. /run/snapd/lock/*.lock rwk,
  350.  
  351. # support for the mount namespace sharing
  352. capability sys_ptrace,
  353. # allow snap-confine to read /proc/1/ns/mnt
  354. ptrace trace peer=unconfined,
  355.  
  356. mount options=(rw rbind) /run/snapd/ns/ -> /run/snapd/ns/,
  357. mount options=(private) -> /run/snapd/ns/,
  358. / rw,
  359. /run/ rw,
  360. /run/snapd/ rw,
  361. /run/snapd/ns/ rw,
  362. /run/snapd/ns/*.lock rwk,
  363. /run/snapd/ns/*.mnt rw,
  364. ptrace (read, readby, tracedby) peer=/usr/lib/snapd/snap-confine//mount-namespace-capture-helper,
  365. @{PROC}/*/mountinfo r,
  366. capability sys_chroot,
  367. capability sys_admin,
  368. signal (send, receive) set=(abrt) peer=/usr/lib/snapd/snap-confine,
  369. signal (send) set=(int) peer=/usr/lib/snapd/snap-confine//mount-namespace-capture-helper,
  370. signal (send, receive) set=(int, alrm, exists) peer=/usr/lib/snapd/snap-confine,
  371. signal (receive) set=(exists) peer=/usr/lib/snapd/snap-confine//mount-namespace-capture-helper,
  372.  
  373. # workaround for linux 4.13/upstream, see
  374. # https://forum.snapcraft.io/t/snapd-2-27-6-2-in-debian-sid-blocked-on-apparmor-in-kernel-4-13-0-1/2813/3
  375. ptrace (trace, tracedby) peer=/usr/lib/snapd/snap-confine,
  376.  
  377. # For aa_change_hat() to go into ^mount-namespace-capture-helper
  378. @{PROC}/[0-9]*/attr/current w,
  379.  
  380. ^mount-namespace-capture-helper (attach_disconnected) {
  381. # We run privileged, so be fanatical about what we include and don't use
  382. # any abstractions
  383. /etc/ld.so.cache r,
  384. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}ld-*.so mrix,
  385. # libc, you are funny
  386. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libc{,-[0-9]*}.so* mr,
  387. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libpthread{,-[0-9]*}.so* mr,
  388. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libreadline{,-[0-9]*}.so* mr,
  389. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}librt{,-[0-9]*}.so* mr,
  390. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libgcc_s.so* mr,
  391. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libncursesw{,-[0-9]*}.so* mr,
  392. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libresolv{,-[0-9]*}.so* mr,
  393. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libselinux.so* mr,
  394. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libpcre.so* mr,
  395. # normal libs in order
  396. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libapparmor.so* mr,
  397. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libcgmanager.so* mr,
  398. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libdl{,-[0-9]*}.so* mr,
  399. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libnih.so* mr,
  400. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libnih-dbus.so* mr,
  401. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libdbus-1.so* mr,
  402. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libudev.so* mr,
  403. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libseccomp.so* mr,
  404. /{,usr/}lib{,32,64,x32}/{,@{multiarch}/}libcap.so* mr,
  405.  
  406. /usr/lib/snapd/snap-confine mr,
  407.  
  408. /dev/null rw,
  409. /dev/full rw,
  410. /dev/zero rw,
  411. /dev/random r,
  412. /dev/urandom r,
  413.  
  414. capability sys_ptrace,
  415. capability sys_admin,
  416. # This allows us to read and bind mount the namespace file
  417. / r,
  418. @{PROC}/ r,
  419. @{PROC}/*/ r,
  420. @{PROC}/*/ns/ r,
  421. @{PROC}/*/ns/mnt r,
  422. /run/ r,
  423. /run/snapd/ r,
  424. /run/snapd/ns/ r,
  425. /run/snapd/ns/*.mnt rw,
  426. # NOTE: the source name is / even though we map /proc/123/ns/mnt
  427. mount options=(rw bind) / -> /run/snapd/ns/*.mnt,
  428. # This is the SIGALRM that we send and receive if a timeout expires
  429. signal (send, receive) set=(alrm) peer=/usr/lib/snapd/snap-confine//mount-namespace-capture-helper,
  430. # Those two rules are exactly the same but we don't know if the parent process is still alive
  431. # and hence has the appropriate label or is already dead and hence has no label.
  432. signal (send) set=(exists) peer=/usr/lib/snapd/snap-confine,
  433. signal (send) set=(exists) peer=unconfined,
  434. # This is so that we can abort
  435. signal (send, receive) set=(abrt) peer=/usr/lib/snapd/snap-confine//mount-namespace-capture-helper,
  436. # This is the signal we get if snap-confine dies (we subscribe to it with prctl)
  437. signal (receive) set=(int) peer=/usr/lib/snapd/snap-confine,
  438. # This allows snap-confine to be killed from the outside.
  439. signal (receive) peer=unconfined,
  440. # This allows snap-confine to wait for us
  441. ptrace (read, trace, tracedby) peer=/usr/lib/snapd/snap-confine,
  442. }
  443.  
  444. # Allow snap-confine to be killed
  445. signal (receive) peer=unconfined,
  446.  
  447. # Allow switching to snap-update-ns with a per-snap profile.
  448. change_profile -> snap-update-ns.*,
  449.  
  450. # Allow executing snap-update-ns when...
  451.  
  452. # ...snap-confine is, conceptually, re-executing and uses snap-update-ns
  453. # from the distribution package. This is also the location used when using
  454. # the core/base snap on all-snap systems. The variants here represent
  455. # various locations of libexecdir across distributions.
  456. /usr/lib{,exec,64}/snapd/snap-update-ns r,
  457.  
  458. # ...snap-confine is not, conceptually, re-executing and uses
  459. # snap-update-ns from the distribution package but we are already inside
  460. # the constructed mount namespace so we must traverse "hostfs". The
  461. # variants here represent various locations of libexecdir across
  462. # distributions.
  463. /var/lib/snapd/hostfs/usr/lib{,exec,64}/snapd/snap-update-ns r,
  464.  
  465. # ..snap-confine is, conceptually, re-executing and uses snap-update-ns
  466. # from the core snap. Note that the location of the core snap varies from
  467. # distribution to distribution. The variants here represent different
  468. # locations of snap mount directory across distributions.
  469. /{,var/lib/snapd/}snap/core/*/usr/lib/snapd/snap-update-ns r,
  470.  
  471. # ...snap-confine is, conceptually, re-executing and uses snap-update-ns
  472. # from the core snap but we are already inside the constructed mount
  473. # namespace. Here the apparmor kernel module re-constructs the path to
  474. # snap-update-ns using the "hostfs" mount entry rather than the more
  475. # "natural" /snap mount entry but we have no control over that. This is
  476. # reported as (LP: #1716339). The variants here represent different
  477. # locations of snap mount directory across distributions.
  478. /var/lib/snapd/hostfs/{,var/lib/snapd/}snap/core/*/usr/lib/snapd/snap-update-ns r,
  479. }
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