1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
import ./make-test.nix {
name = "systemd-confinement";
machine = { pkgs, lib, ... }: let
testServer = pkgs.writeScript "testserver.sh" ''
#!${pkgs.runtimeShell}
export PATH=${lib.escapeShellArg "${pkgs.coreutils}/bin"}
${lib.escapeShellArg pkgs.runtimeShell} 2>&1
echo "exit-status:$?"
'';
testClient = pkgs.writeScriptBin "chroot-exec" ''
#!${pkgs.runtimeShell} -e
output="$(echo "$@" | nc -NU "/run/test$(< /teststep).sock")"
ret="$(echo "$output" | sed -nre '$s/^exit-status:([0-9]+)$/\1/p')"
echo "$output" | head -n -1
exit "''${ret:-1}"
'';
mkTestStep = num: { description, config ? {}, testScript }: {
systemd.sockets."test${toString num}" = {
description = "Socket for Test Service ${toString num}";
wantedBy = [ "sockets.target" ];
socketConfig.ListenStream = "/run/test${toString num}.sock";
socketConfig.Accept = true;
};
systemd.services."test${toString num}@" = {
description = "Confined Test Service ${toString num}";
confinement = (config.confinement or {}) // { enable = true; };
serviceConfig = (config.serviceConfig or {}) // {
ExecStart = testServer;
StandardInput = "socket";
};
} // removeAttrs config [ "confinement" "serviceConfig" ];
__testSteps = lib.mkOrder num ''
subtest '${lib.escape ["\\" "'"] description}', sub {
$machine->succeed('echo ${toString num} > /teststep');
${testScript}
};
'';
};
in {
imports = lib.imap1 mkTestStep [
{ description = "chroot-only confinement";
config.confinement.mode = "chroot-only";
testScript = ''
$machine->succeed(
'test "$(chroot-exec ls -1 / | paste -sd,)" = bin,nix',
'test "$(chroot-exec id -u)" = 0',
'chroot-exec chown 65534 /bin',
);
'';
}
{ description = "full confinement with APIVFS";
testScript = ''
$machine->fail(
'chroot-exec ls -l /etc',
'chroot-exec ls -l /run',
'chroot-exec chown 65534 /bin',
);
$machine->succeed(
'test "$(chroot-exec id -u)" = 0',
'chroot-exec chown 0 /bin',
);
'';
}
{ description = "check existence of bind-mounted /etc";
config.serviceConfig.BindReadOnlyPaths = [ "/etc" ];
testScript = ''
$machine->succeed('test -n "$(chroot-exec cat /etc/passwd)"');
'';
}
{ description = "check if User/Group really runs as non-root";
config.serviceConfig.User = "chroot-testuser";
config.serviceConfig.Group = "chroot-testgroup";
testScript = ''
$machine->succeed('chroot-exec ls -l /dev');
$machine->succeed('test "$(chroot-exec id -u)" != 0');
$machine->fail('chroot-exec touch /bin/test');
'';
}
(let
symlink = pkgs.runCommand "symlink" {
target = pkgs.writeText "symlink-target" "got me\n";
} "ln -s \"$target\" \"$out\"";
in {
description = "check if symlinks are properly bind-mounted";
config.confinement.packages = lib.singleton symlink;
testScript = ''
$machine->fail('chroot-exec test -e /etc');
$machine->succeed('chroot-exec cat ${symlink} >&2');
$machine->succeed('test "$(chroot-exec cat ${symlink})" = "got me"');
'';
})
{ description = "check if StateDirectory works";
config.serviceConfig.User = "chroot-testuser";
config.serviceConfig.Group = "chroot-testgroup";
config.serviceConfig.StateDirectory = "testme";
testScript = ''
$machine->succeed('chroot-exec touch /tmp/canary');
$machine->succeed('chroot-exec "echo works > /var/lib/testme/foo"');
$machine->succeed('test "$(< /var/lib/testme/foo)" = works');
$machine->succeed('test ! -e /tmp/canary');
'';
}
{ description = "check if /bin/sh works";
testScript = ''
$machine->succeed(
'chroot-exec test -e /bin/sh',
'test "$(chroot-exec \'/bin/sh -c "echo bar"\')" = bar',
);
'';
}
{ description = "check if suppressing /bin/sh works";
config.confinement.binSh = null;
testScript = ''
$machine->succeed(
'chroot-exec test ! -e /bin/sh',
'test "$(chroot-exec \'/bin/sh -c "echo foo"\')" != foo',
);
'';
}
{ description = "check if we can set /bin/sh to something different";
config.confinement.binSh = "${pkgs.hello}/bin/hello";
testScript = ''
$machine->succeed(
'chroot-exec test -e /bin/sh',
'test "$(chroot-exec /bin/sh -g foo)" = foo',
);
'';
}
{ description = "check if only Exec* dependencies are included";
config.environment.FOOBAR = pkgs.writeText "foobar" "eek\n";
testScript = ''
$machine->succeed('test "$(chroot-exec \'cat "$FOOBAR"\')" != eek');
'';
}
{ description = "check if all unit dependencies are included";
config.environment.FOOBAR = pkgs.writeText "foobar" "eek\n";
config.confinement.fullUnit = true;
testScript = ''
$machine->succeed('test "$(chroot-exec \'cat "$FOOBAR"\')" = eek');
'';
}
];
options.__testSteps = lib.mkOption {
type = lib.types.lines;
description = "All of the test steps combined as a single script.";
};
config.environment.systemPackages = lib.singleton testClient;
config.users.groups.chroot-testgroup = {};
config.users.users.chroot-testuser = {
description = "Chroot Test User";
group = "chroot-testgroup";
};
};
testScript = { nodes, ... }: ''
$machine->waitForUnit('multi-user.target');
${nodes.machine.config.__testSteps}
'';
}
|