cageforge-policy 0.7.1

Filesystem and network policies for Rust process sandboxes
Documentation 
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

// SPDX-License-Identifier: Apache-2.0

use cageforge_policy::{DomainAccess, LocalNetworkAccess, NetworkDecision, NetworkPolicy};
use proptest::prelude::*;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

fn public_ip() -> impl Strategy<Value = IpAddr> {
    prop::sample::select(vec![
        IpAddr::V4(Ipv4Addr::new(1, 1, 1, 1)),
        IpAddr::V4(Ipv4Addr::new(8, 8, 8, 8)),
        IpAddr::V4(Ipv4Addr::new(93, 184, 216, 34)),
        IpAddr::V6(Ipv6Addr::new(0x2001, 0x4860, 0x4860, 0, 0, 0, 0, 0x8888)),
        IpAddr::V6(Ipv6Addr::new(0x2606, 0x4700, 0x4700, 0, 0, 0, 0, 0x1111)),
    ])
}

fn non_public_ip() -> impl Strategy<Value = IpAddr> {
    prop::sample::select(vec![
        IpAddr::V4(Ipv4Addr::new(0, 1, 2, 3)),
        IpAddr::V4(Ipv4Addr::new(10, 0, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(100, 64, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(169, 254, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(172, 16, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(192, 0, 2, 1)),
        IpAddr::V4(Ipv4Addr::new(192, 168, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(198, 18, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(198, 51, 100, 1)),
        IpAddr::V4(Ipv4Addr::new(203, 0, 113, 1)),
        IpAddr::V4(Ipv4Addr::new(224, 0, 0, 1)),
        IpAddr::V4(Ipv4Addr::new(240, 0, 0, 1)),
        IpAddr::V6(Ipv6Addr::UNSPECIFIED),
        IpAddr::V6(Ipv6Addr::LOCALHOST),
        IpAddr::V6(Ipv6Addr::new(0xfc00, 0, 0, 0, 0, 0, 0, 1)),
        IpAddr::V6(Ipv6Addr::new(0xfe80, 0, 0, 0, 0, 0, 0, 1)),
        IpAddr::V6(Ipv6Addr::new(0xff02, 0, 0, 0, 0, 0, 0, 1)),
        IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 1)),
    ])
}

fn resolved_ip() -> impl Strategy<Value = (IpAddr, bool)> {
    prop_oneof![
        public_ip().prop_map(|ip| (ip, false)),
        non_public_ip().prop_map(|ip| (ip, true)),
    ]
}

proptest! {
    #![proptest_config(ProptestConfig::with_cases(32))]

    #[test]
    fn hostname_allow_requires_all_resolved_addresses_to_be_public(
        resolved in prop::collection::vec(resolved_ip(), 0..=4),
    ) {
        let policy = NetworkPolicy::enabled()
            .with_domain("service.example", DomainAccess::Allow)
            .expect("valid domain rule");
        let addresses: Vec<IpAddr> = resolved.iter().map(|(ip, _)| *ip).collect();
        let has_non_public = resolved.iter().any(|(_, non_public)| *non_public);
        let expected = if addresses.is_empty() || has_non_public {
            NetworkDecision::Deny
        } else {
            NetworkDecision::Allow
        };

        prop_assert_eq!(
            policy
                .decision_for_domain_with_resolved_ips("service.example", &addresses)
                .expect("valid hostname"),
            expected,
        );
    }

    #[test]
    fn localhost_is_denied_even_when_dns_reports_public_addresses(
        public in public_ip(),
    ) {
        let policy = NetworkPolicy::enabled()
            .with_domain("*", DomainAccess::Allow)
            .expect("valid wildcard domain");

        prop_assert_eq!(
            policy
                .decision_for_domain_with_resolved_ips("localhost", &[public])
                .expect("valid localhost hostname"),
            NetworkDecision::Deny,
        );
    }

    #[test]
    fn explicit_local_opt_in_allows_non_public_results_but_not_failed_resolution(
        local in non_public_ip(),
    ) {
        let policy = NetworkPolicy::enabled()
            .with_local_network_access(LocalNetworkAccess::Allow)
            .with_domain("service.example", DomainAccess::Allow)
            .expect("valid domain rule");

        prop_assert_eq!(
            policy
                .decision_for_domain_with_resolved_ips("service.example", &[local])
                .expect("valid hostname"),
            NetworkDecision::Allow,
        );
        prop_assert_eq!(
            policy
                .decision_for_domain_with_resolved_ips("service.example", &[])
                .expect("valid hostname"),
            NetworkDecision::Deny,
        );
    }

    #[test]
    fn exact_literal_allow_is_the_only_default_local_literal_opt_in(
        local in non_public_ip(),
    ) {
        let literal = local.to_string();
        let allowlisted = NetworkPolicy::enabled()
            .with_domain(literal.clone(), DomainAccess::Allow)
            .expect("valid literal rule");
        let ordinary = NetworkPolicy::enabled();

        prop_assert_eq!(
            allowlisted
                .decision_for_domain_with_resolved_ips(&literal, &[])
                .expect("valid literal"),
            NetworkDecision::Allow,
        );
        prop_assert_eq!(
            ordinary
                .decision_for_domain_with_resolved_ips(&literal, &[])
                .expect("valid literal"),
            NetworkDecision::Deny,
        );
    }
}