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AppArmor resolves executable links before profile attachment rules are evaluated, so, as long as pasta is installed as a link to passt, there's no way to differentiate the two cases. Merge the two profiles and leave a TODO note behind, explaining two possible ways forward. Update the rules so that passt and pasta are actually usable, once the profile is installed. Most required changes are related to isolation and sandboxing features. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
89 lines
2.4 KiB
Plaintext
89 lines
2.4 KiB
Plaintext
# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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# for qemu/UNIX domain socket mode
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#
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# PASTA - Pack A Subtle Tap Abstraction
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# for network namespace/tap device mode
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#
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# contrib/apparmor/usr.bin.passt - AppArmor profile for passt(1) and pasta(1)
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#
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# Copyright (c) 2022 Red Hat GmbH
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# Author: Stefano Brivio <sbrivio@redhat.com>
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abi <abi/3.0>,
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include <tunables/global>
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profile passt /usr/bin/passt{,.avx2} flags=(attach_disconnected) {
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### Common rules for passt and pasta
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include <abstractions/base>
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# Alternatively: include <abstractions/nameservice>
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@{etc_ro}/resolv.conf r, # get_dns(), conf.c
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capability net_bind_service, # isolation.c, conf.c
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capability setuid,
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capability setgid,
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capability sys_admin,
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capability setpcap,
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capability net_admin,
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capability sys_ptrace,
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/ r, # isolate_prefork(), isolation.c
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mount "" -> "/",
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mount "" -> "/tmp/",
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pivot_root "/tmp/" -> "/tmp/",
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umount "/",
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network netlink raw, # nl_sock_init_do(), netlink.c
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network inet stream, # tcp.c
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network inet6 stream,
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network inet dgram, # udp.c
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network inet6 dgram,
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network unix stream, # tap.c
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network unix dgram, # __openlog(), log.c
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# Alternatively: include <abstractions/user-tmp>
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owner /tmp/** w, # tap_sock_unix_init(), pcap(),
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# write_pidfile(),
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# logfile_init()
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owner @{HOME}/** w, # pcap(), write_pidfile()
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/usr/bin/passt.avx2 ix, # arch_avx2_exec(), arch.c
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### Rules for pasta
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###
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### TODO: AppArmor doesn't give us the chance to attach a separate profile
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### depending on the executable symlink. That's possible with SELinux. Two
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### alternatives: implement that in AppArmor, or consider aa_change_hat(2).
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### With this, rules for passt(1) could be restricted significantly. Note that
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### the attach_disconnected flag is not needed for passt(1).
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@{PROC}/net/tcp r, # procfs_scan_listen(), util.c
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@{PROC}/net/tcp6 r,
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@{PROC}/net/udp r,
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@{PROC}/net/udp6 r,
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@{run}/user/@{uid}/netns/* r, # pasta_open_ns(), pasta.c
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@{PROC}/[0-9]*/ns/net r, # pasta_wait_for_ns(),
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@{PROC}/[0-9]*/ns/user r, # conf_pasta_ns()
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/dev/net/tun rw, # tap_ns_tun(), tap.c
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owner @{PROC}/@{pid}/gid_map w, # pasta_start_ns(), conf_ugid()
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owner @{PROC}/@{pid}/setgroups w,
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owner @{PROC}/@{pid}/uid_map rw,
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owner @{PROC}/sys/net/ipv4/ping_group_range w, # pasta_spawn_cmd(), pasta.c
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/{usr/,}bin/** Ux,
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}
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